WO2024098241A1 - 电化学装置、用电设备及电化学装置的制备方法 - Google Patents
电化学装置、用电设备及电化学装置的制备方法 Download PDFInfo
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- WO2024098241A1 WO2024098241A1 PCT/CN2022/130553 CN2022130553W WO2024098241A1 WO 2024098241 A1 WO2024098241 A1 WO 2024098241A1 CN 2022130553 W CN2022130553 W CN 2022130553W WO 2024098241 A1 WO2024098241 A1 WO 2024098241A1
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- battery cell
- fixing member
- cell group
- electrode terminal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/514—Methods for interconnecting adjacent batteries or cells
- H01M50/516—Methods for interconnecting adjacent batteries or cells by welding, soldering or brazing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
- H01M50/557—Plate-shaped terminals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the embodiments of the present application relate to the field of electrochemical technology, and in particular, to an electrochemical device, electrical equipment, and a method for preparing the electrochemical device.
- Electrode terminals are usually connected through electrode terminals in electrochemical devices.
- the connection between the electrode terminals may be deformed by force, affecting the use of the electrochemical devices.
- the embodiments of the present application provide an electrochemical device, an electrical equipment and a method for preparing the electrochemical device to improve the above problems.
- an electrochemical device comprising: N battery cells, M first fixing members, M second fixing members and M-1 conductive members, wherein N and M are both positive integers and 2 ⁇ M ⁇ N; the N battery cells are divided into M battery cell groups, each battery cell group comprises at least one battery cell, the battery cells in the battery cell groups are arranged along a first direction, and the M battery cell groups are arranged along the first direction; the battery cell comprises a battery cell housing and two electrode terminals, the two electrode terminals are arranged oppositely on both sides of the battery cell housing along a second direction, wherein the second direction is the direction in which the first fixing member and the second fixing member are arranged oppositely.
- the first direction is perpendicular to the first direction; along the first direction, the electrode terminals of two adjacent battery cell groups are connected by a conductive member, and a connection area is formed on the conductive member; along the second direction, the battery cell group includes a first side and a second side that are oppositely arranged, wherein the first fixing member is bonded to at least a portion of the electrode terminals on the first side of the battery cell group, and at least one first fixing member is bonded to at least a portion of the connection area, and/or the second fixing member is bonded to at least a portion of the electrode terminals on the second side of the battery cell group, and at least one second fixing member is bonded to at least a portion of the connection area.
- the first fixing member is bonded to at least a portion of the electrode terminal on the first side of the battery cell group, and at least one first fixing member is bonded to at least a portion of the connection area, which is beneficial to protecting the electrode terminal and the conductive member, and providing protection for the connection area, thereby improving the stability of the electrochemical device.
- the second fixing member is bonded to at least a portion of the electrode terminal on the second side of the battery cell group, and at least one second fixing member is bonded to at least a portion of the connection area, which is beneficial to improving the protection of the electrode terminal and the conductive member, and the protection of the connection area formed on the electrode terminal and the conductive member, thereby improving the stability of the electrochemical device.
- At least one battery cell group includes a plurality of battery cells, and on a first side of the battery cell group, the electrode terminals of each of the plurality of battery cells are connected to each other; and/or at least one battery cell group includes a plurality of battery cells, and on a second side of the battery cell group, the electrode terminals of each of the plurality of battery cells are connected to each other.
- a battery cell group includes a plurality of battery cells, it is advantageous to form a series connection or a parallel connection between adjacent battery cell groups.
- At least one battery cell group includes a plurality of battery cells, and at least one electrode terminal of each of the plurality of battery cells is connected to each other by welding on a first side of the battery cell group; and/or at least one battery cell group includes a plurality of battery cells, and at least one electrode terminal of each of the plurality of battery cells is connected to each other by welding on a second side of the battery cell group. This is beneficial to improving the stability of the interconnection of the plurality of battery cells.
- At least one battery cell group includes a plurality of battery cells, and at least one electrode terminal of at least one of the plurality of battery cells is bent on a first side of the battery cell group; and/or at least one battery cell group includes a plurality of battery cells, and at least one electrode terminal of at least one of the plurality of battery cells is bent on a second side of the battery cell group. This is beneficial to improving the space utilization when the plurality of battery cells are connected to each other.
- the electrochemical device further comprises an elastic member, the elastic member is disposed between two adjacent battery cell groups, and the elastic member contacts at least one of the two battery cell groups.
- the elastic member is conducive to providing deformation space for the expanded battery cell.
- the thickness of the elastic member when not compressed by the battery cell is T1
- the spacing formed in the first direction between two adjacent battery cell groups along the first direction is T2
- the thickness of the battery cell when not undergoing a charge-discharge cycle is T3
- half of the sum of the number of battery cells in two adjacent battery cell groups along the first direction is X
- T1, T2, T3, and X satisfy: T2-X*T3*20% ⁇ T1 ⁇ T2.
- the elastic member is conducive to providing deformation space and support when the battery cell expands, which is conducive to reducing the risk of battery cell damage and increasing the service life of the electrochemical device.
- the first fixing member includes a first sleeve, and along the first direction, the wall thickness of the first sleeve is greater than or equal to 1 mm and less than or equal to 5 mm; and/or the second fixing member includes a second sleeve, and along the first direction, the wall thickness of the second sleeve is greater than or equal to 1 mm and less than or equal to 5 mm. This is conducive to improving the protection effect of the electrode terminal.
- the first fixing member of one battery cell group is connected to the second fixing member of the other battery cell group, and the first fixing member and the second fixing member form a gap in the first direction.
- a gap is also formed between the two adjacent battery cell groups, which is conducive to improving the heat dissipation of the battery cell groups, and further improving the heat dissipation of the electrochemical device.
- one of the first fixing member and the second fixing member is provided with a convex portion, and the first fixing member and the second fixing member form a distance through the convex portion.
- the other of the first fixing member and the second fixing member is provided with a recess
- the length of the protrusion along the first direction is greater than the length of the recess along the first direction
- the first fixing member and the second fixing member form a spacing through the cooperation of the protrusion and the recess.
- the length of the convex portion is greater than the length of the concave portion.
- the convex portion cooperates with the concave portion to form a gap between the first fixing member and the second fixing member, and a gap is also formed between adjacent battery cell groups, which is beneficial to improving the heat dissipation of the battery cell group and further improving the heat dissipation of the electrochemical device.
- the battery cell also includes an electrode assembly, which is disposed in a battery cell shell, and two electrode terminals are connected to the electrode assembly and extend out of the battery cell shell; in the same battery cell group, along a first direction, a projection of the first fixing member is separated from a projection of the electrode assembly of the battery cell in the battery cell group; and/or, in the same battery cell group, along the first direction, a projection of the second fixing member is separated from a projection of the electrode assembly of the battery cell in the battery cell group.
- the projections of the first fixing member and the second fixing member are separated from the projection of the electrode assembly, which is beneficial to reduce the impact on the expansion of the electrode assembly and increase the service life of the electrochemical device.
- At least one first fixing member is formed on the first side of the battery cell group and at least part of the connection area by injection molding; and/or at least one second fixing member is formed on the second side of the battery cell group and at least part of the connection area by injection molding. This is beneficial to improve the protection of the connection area formed on the electrode terminal and the conductive member.
- the first fixing member covers the portion of the electrode terminal outside the battery cell housing and at least a portion of the battery cell housing; and/or the second fixing member covers the portion of the electrode terminal outside the battery cell housing and at least a portion of the battery cell housing. This is beneficial to improving the protection of the electrode terminal and the battery cell.
- the first fixing member is provided with at least one first through hole, the first through hole penetrates the first fixing member along a third direction; and/or the second fixing member is provided with at least one first through hole, the first through hole penetrates the second fixing member along a third direction, wherein the third direction is perpendicular to the first direction and the second direction.
- the electrochemical device further includes a shell; the shell includes a third wall and a fourth wall that are relatively arranged along the third direction; a second through hole is opened on the third wall and/or the fourth wall, and the second through hole is connected to the first through hole.
- an electrochemical device including: N battery cells, A first fixing members, A second fixing members, (L-1)*A third fixing members, wherein N, M, and L are all positive integers and 2 ⁇ M ⁇ N, L ⁇ 2; the N battery cells are divided into M battery cell groups, and the M battery cell groups are divided into A rows and L columns, and along the second direction, the battery cell groups include a first side and a second side that are relatively arranged; each of the battery cell groups includes at least one battery cell, and the battery cells in the battery cell group are arranged along the first direction, and the second direction is perpendicular to the first direction; the battery cell includes a battery cell shell and two electrode terminals, and the two electrode terminals are relatively arranged on both sides of the battery cell shell along the second direction; wherein, in one In a row of cell groups, the first fixing member is located on a first side of a first cell group in the row, and is bonded to at least a portion of an electrode terminal on the first side of
- the first fixing member, the second fixing member and the third fixing member are beneficial to strengthening the protection of each electrode terminal of the battery cell group and improving the stability and service life of the electrochemical device.
- the A-row battery cell groups are stacked along the first direction; the electrochemical device further comprises A-1 conductive members; in two adjacent rows of battery cell groups, the electrode terminal on the first side of the first battery cell group in one row is connected to the electrode terminal on the second side of the first battery cell group in the other row through the conductive member, and a connection area is formed on the conductive member, at least one of the first fixing members is bonded to at least part of the connection area, and/or at least one of the second fixing members is bonded to at least part of the connection area.
- This is beneficial to enhance the protection of the electrode terminal and the connection area formed on the conductive member, and improve the stability of the electrochemical device.
- the electrode terminal on the second side of one cell group is connected to the electrode terminal on the first side of the other cell group by welding, which is beneficial to improving the stability of the connection between adjacent cell groups.
- At least one battery cell group includes a plurality of battery cells, and on a first side of the battery cell group, an electrode terminal of at least one of the plurality of battery cells is bent; and/or at least one battery cell group includes a plurality of battery cells, and on a second side of the battery cell group, an electrode terminal of at least one of the plurality of battery cells is bent. This is beneficial to improving the space utilization when the plurality of battery cells are connected to each other.
- the electrochemical device further comprises an elastic member, wherein the elastic member is disposed between two adjacent battery cell groups in the same column of battery cell groups, and the elastic member contacts at least one of the two battery cell groups.
- the elastic member is conducive to providing deformation space for the expanded battery cell.
- the thickness of the elastic member when not compressed by the battery cell is T1
- the spacing formed in the first direction between two adjacent battery cell groups in the same column of battery cell groups is T2
- the thickness of the battery cell when not undergoing a charge and discharge cycle is T3
- half of the sum of the number of battery cells in two adjacent battery cell groups in the same column of battery cell groups is X
- T1, T2, T3, and X satisfy: T2-X*T3*20% ⁇ T1 ⁇ T2.
- the elastic member is conducive to providing deformation space and support when the battery cell expands, which is conducive to reducing the risk of battery cell damage and increasing the service life of the electrochemical device.
- the first fixing member includes a first sleeve, and along the first direction, the wall thickness of the first sleeve is greater than or equal to 1mm and less than or equal to 5mm; and/or, the second fixing member includes a second sleeve, and along the first direction, the wall thickness of the second sleeve is greater than or equal to 1mm and less than or equal to 5mm; and/or, the third fixing member includes a third sleeve and a fourth sleeve, and along the first direction, the wall thickness of the third sleeve is greater than or equal to 1mm and less than or equal to 5mm, and the wall thickness of the fourth sleeve is greater than or equal to 1mm and less than or equal to 5mm. This is conducive to improving the protection effect of the electrode terminal.
- At least one first fixing member is formed by injection molding on the first side of the first cell group in the row and at least part of the connection area; and/or, at least one second fixing member is formed by injection molding on the second side of the last cell group in the row and at least part of the connection area; and/or, for two adjacent cell groups in a row, at least one third fixing member is formed by injection molding on the second side of one cell group and the first side of another cell group.
- the first fixing member covers the portion of the electrode terminal outside the battery cell housing and at least a portion of the battery cell housing; and/or, the second fixing member covers the portion of the electrode terminal outside the battery cell housing and at least a portion of the battery cell housing; and/or, the third fixing member covers the portion of the electrode terminal outside the battery cell housing and at least a portion of the battery cell housing. This is beneficial to improving the protection of the electrode terminal and the battery cell.
- the first fixing member is provided with at least one first through hole, which penetrates the first fixing member along a third direction; and/or, the second fixing member is provided with at least one first through hole, which penetrates the second fixing member along a third direction; and/or, the third fixing member is provided with at least one first through hole, which penetrates the third fixing member along a third direction; wherein the third direction is perpendicular to the first direction and the second direction.
- the first fixing member in one battery cell group is connected to the second fixing member in the other battery cell group, and the first fixing member and the second fixing member form a gap in the first direction; and/or, along the first direction, in two adjacent battery cell groups, the third fixing member in one battery cell group is connected to the third fixing member in the other battery cell group, and the two third fixing members form a gap in the first direction.
- the battery cell further includes an electrode assembly, the electrode assembly is disposed in the battery cell housing, and two electrode terminals are connected to the electrode assembly and extend out of the battery cell housing; in the same battery cell group, along the first direction, the projection of the first fixing member is separated from the projection of the electrode assembly of the battery cell in the battery cell group; and/or, in the same battery cell group, along the first direction, the projection of the second fixing member is separated from the projection of the electrode assembly of the battery cell in the battery cell group; and/or, in the same row of battery cell groups, along the first direction, the projection of the third fixing member between two adjacent battery cell groups is separated from the projection of the electrode assembly of the battery cells in the two battery cell groups.
- This is beneficial to reduce the impact on the expansion of the electrode assembly and improve the service life of the electrochemical device.
- the electrochemical device further comprises a housing, the housing comprising a third wall and a fourth wall arranged opposite to each other along a third direction; a second through hole is provided on the third wall and/or the fourth wall, and the second through hole is connected to the first through hole.
- an electrical device comprising: an electrochemical device as described in any one of the first aspect or the second aspect.
- a preparation method of an electrochemical device comprising: step S101: connecting the electrode terminals of two adjacent battery cell groups of M battery cell groups through a conductive member, and forming a connection area on the conductive member; step S102: arranging a flowable insulating material on a first side of the battery cell group and the conductive member, and after the insulating material is solidified, bonding the connection area close to the first side of the battery cell group, the portion of the electrode terminal located outside the battery cell shell, and at least a portion of the battery cell shell to form a first fixing member; step S103: arranging a flowable insulating material on a second side of the battery cell group and the conductive member, and after the insulating material is solidified, bonding the connection area close to the second side of the battery cell group, the portion of the electrode terminal located outside the battery cell shell, and at least a portion of the battery cell shell to form a second fixing member.
- a preparation method of an electrochemical device comprising: step S201: connecting electrode terminals of two adjacent battery cell groups in the same row of battery cell groups, arranging a flowable insulating material on a first side and a second side of the two adjacent battery cell groups, and after the insulating material is cured, bonding the portion of the electrode terminal located outside the battery cell shell and at least a portion of the battery cell shell to form a third fixing member; step S202: arranging the flowable insulating material on the first side of the first battery cell group in the row of battery cell groups, and after the insulating material is cured, bonding the portion of the electrode terminal located outside the battery cell shell and at least a portion of the battery cell shell to form a first fixing member; step S203: arranging the flowable insulating material on the second side of the last battery cell group in the row of battery cell groups, and after the insulating material is cured, bonding the portion of the electrode terminal
- the method also includes: step S204: providing M-1 conductive members, connecting the electrode terminals on the first side of the first cell group in one of two adjacent rows of cell groups with the electrode terminals on the second side of the first cell group in the other row of cell groups through the conductive members, and forming a connection area on the conductive members; step S205: arranging a flowable insulating material on the first side of the cell group and the conductive member, and after the insulating material is cured, bonding the connection area close to the first side of the cell group; step S206: arranging a flowable insulating material on the second side of the cell group and the conductive member, and after the insulating material is cured, bonding the connection area close to the second side of the cell group.
- the first fixing member is bonded to at least part of the electrode terminal on the first side of the battery cell group, and at least one first fixing member is bonded to at least part of the connection area formed by the electrode terminal and the conductive member; and/or, the second fixing member is bonded to at least part of the electrode terminal on the second side of the battery cell group, and at least one second fixing member is bonded to at least part of the connection area formed by the electrode terminal and the conductive member.
- Each first fixing member and each second fixing member are conducive to protecting the electrode terminal of the battery cell, and are conducive to protecting the connection area formed by the electrode terminal and the conductive member, thereby improving the stability and service life of the electrochemical device.
- the electrode terminals of two adjacent battery cell groups are connected, the third fixing member is bonded to at least a portion of the electrode terminal on the second side of one of the two adjacent battery cell groups, and the third fixing member is bonded to at least a portion of the electrode terminal on the first side of the other of the two adjacent battery cell groups.
- the first fixing member is bonded to at least a portion of the connection area formed by the electrode terminal and the conductive member, and/or the second fixing member is bonded to at least a portion of the connection area formed by the electrode terminal and the conductive member.
- Each first fixing member, each second fixing member, and each third fixing member are conducive to protecting the electrode terminal of the battery cell, and are conducive to protecting the connection area formed by the electrode terminal and the conductive member, thereby improving the stability and service life of the electrochemical device.
- FIG. 1 shows a schematic diagram of an optional electrochemical device of the present application.
- FIG. 2 shows a schematic diagram of an optional arrangement of cells of an electrochemical device of the present application.
- FIG. 3 shows a schematic diagram of another optional arrangement of cells of an electrochemical device of the present application.
- FIG. 4 is a schematic diagram showing a connection method of electrode terminals of each battery cell of a battery cell group of the present application.
- FIG5 shows a schematic diagram of an optional structure of a battery cell of the present application.
- FIG. 6 shows a schematic diagram of an optional structure of a first fixing member of the present application.
- FIG. 7 shows a schematic diagram of an optional structure of a second fixing member of the present application.
- FIG. 8 is an enlarged schematic diagram of Q1 in FIG. 2 .
- FIG9 is a schematic diagram showing that the length of the third structure member along the first direction of the present application is smaller than the length of the fourth structure member along the first direction.
- FIG. 10 is a schematic diagram showing that the length of the third structure member along the first direction of the present application is greater than the length of the fourth structure member along the first direction.
- FIG. 11 is an enlarged schematic diagram showing a cross section at Q2 in FIG. 8 .
- FIG. 12 shows an optional schematic structural diagram of the third wall of the electrochemical device in FIG. 1 .
- FIG. 13 shows an optional structural schematic diagram of the electrochemical device in FIG. 1 after the fourth wall is removed.
- FIG. 14 shows a schematic diagram of yet another optional electrochemical device in the present application.
- FIG. 15 shows a schematic diagram of another optional arrangement of cells of an electrochemical device in the present application.
- FIG. 16 shows a schematic diagram of another optional arrangement of cells in an electrochemical device in the present application.
- FIG. 17 is a schematic diagram showing a connection between the second electrode terminal and the first electrode terminal of the present application.
- FIG. 18 shows another schematic diagram of the connection between the second electrode terminal and the first electrode terminal of the present application.
- FIG. 19 is an enlarged schematic diagram of Q4 in FIG. 17 .
- FIG. 20 is a schematic diagram showing the position between the third fixing member and the electrode terminal of the present application.
- FIG. 21 shows a schematic diagram of an optional structure of a third fixing member of the present application.
- FIG. 22 shows an enlarged schematic diagram of Q3 in FIG. 15 .
- FIG. 23 is an enlarged schematic diagram of a cross section at Q5 of FIG. 22 .
- FIG. 24 shows an optional schematic structural diagram of the third wall of the electrochemical device in FIG. 14 .
- FIG. 25 shows an optional structural schematic diagram of the electrochemical device in FIG. 14 after the fourth wall is removed.
- FIG26 shows a schematic diagram of the structure of an optional electrical device of the present application.
- FIG. 27 shows an optional flow chart of the method for preparing an electrochemical device provided in the first aspect of the present application.
- FIG. 28 shows an optional flow chart of a method for preparing an electrochemical device provided in the second aspect of the present application.
- FIG. 29 shows an optional flow chart of a method for preparing an electrochemical device provided in the second aspect of the present application.
- 100 electrochemical device; 200, electrical equipment; 10, battery cell group; 101, first side of battery cell group; 102, second side of battery cell group; 1, battery cell; 11, battery cell shell; 12, electrode terminal; 1201, first section; 1202, second section; 13, electrode assembly; 21, first fixing member; 210, first sleeve; 211, first side of first fixing member; 212, second side of first fixing member; 22, second fixing member; 220, second sleeve; 221, first side of second fixing member; 222, second side of second fixing member; 23, third fixing member; 231, third sleeve; 2311, first side of third sleeve; 2312, second side of third sleeve; 232, fourth sleeve; 2321, fourth sleeve 23, the first side of the fourth sleeve; 2322, the second side of the fourth sleeve; 24, the conductive member; 25, the connection area between the electrode terminal and the conductive member; 26, the distance between the first fixing member and the second fixing member; 27, the positive
- an electrochemical device 100 which includes: N battery cells 1, M first fixing members 21, M second fixing members 22, and M-1 conductive members 24, wherein N and M are both positive integers and 2 ⁇ M ⁇ N; the N battery cells 1 are divided into M battery cell groups 10, each battery cell group 10 includes at least one battery cell 1, and the battery cells 1 in the battery cell group 10 are arranged along the first direction F1, and the M battery cell groups 10 are arranged along the first direction F1.
- Each battery cell 1 includes a battery cell housing 11 and two electrode terminals 12, and the two electrode terminals 12 are arranged on both sides of the battery cell housing 11 along the second direction F2, wherein the second direction F2 is the direction in which the first fixing member 21 and the second fixing member 22 in a battery cell group 10 are arranged relatively, and the second direction F2 is perpendicular to the first direction F1.
- the electrode terminals 12 of two adjacent battery cell groups 10 are connected by the conductive member 24, and a connection area 25 is formed on the conductive member 24.
- the cell group 10 includes a first side 101 and a second side 102 that are arranged opposite to each other, wherein the first fixing member 21 is bonded to at least a portion of the electrode terminal 12 on the first side 101 of the cell group, and the first fixing member 21 is bonded to at least a portion of the connection area 25 near the first side 101 of the cell group.
- the first fixing member 21 is conducive to providing protection for the electrode terminal 12 of the cell 1, and is conducive to providing protection for the electrode terminal and the connection area 25 formed on the conductive member.
- the second fixing member 22 is bonded to at least a portion of the electrode terminal 12 on the second side 102 of the cell group, and the second fixing member 22 is bonded to at least a portion of the connection area 25 near the second side 102 of the cell group.
- the second fixing member 22 is conducive to providing protection for the electrode terminal 12 of the cell 1, and is conducive to providing protection for the electrode terminal and the connection area 25 formed on the conductive member.
- each battery cell includes an electrode assembly 13, a battery cell shell 11 and an electrode terminal 12, the electrode assembly 13 is disposed in the battery cell shell 11, and the electrode terminal 12 is connected to the electrode assembly 13 and extends out of the battery cell shell 11.
- the electrode terminal 12 includes two, one of which is a positive electrode terminal and the other is a negative electrode terminal.
- the positive electrode terminal and the negative electrode terminal are disposed at the same end of the battery cell shell 11.
- the positive electrode terminal and the negative electrode terminal are disposed at opposite ends of the battery cell shell 11. This specification takes the example of the positive electrode terminal and the negative electrode terminal being disposed at opposite ends of the battery cell shell 11.
- the electrode terminal 12 includes a first section 1201 located inside the cell casing 11 and a second section 1202 located outside the cell casing 11 .
- the first section 1201 is connected to the electrode assembly 13 .
- the electrode assembly 13 may include a positive electrode sheet, a negative electrode sheet, and a separator, wherein the separator is located between the positive electrode sheet and the negative electrode sheet.
- the electrode assembly 13 may be formed by winding the positive electrode sheet, the separator, and the negative electrode sheet, or by stacking the positive electrode sheet, the separator, and the negative electrode sheet.
- the relevant contents of the positive electrode sheet, the separator, and the negative electrode sheet may refer to the relevant technology, and no limitation is made in this application.
- the positive electrode sheet may include a positive active material layer and a positive current collector, wherein the positive active material layer is disposed on the positive current collector, for example, the positive active material layer may be coated on the positive current collector, and there is a blank foil area at the edge of the positive current collector, and the electrode terminal 12 is connected to the blank foil area, for example, the electrode terminal 12 may be used as a positive electrode terminal or an electrode terminal for sampling.
- the negative electrode plate may include a negative electrode active material layer and a negative electrode current collector, wherein the negative electrode active material layer is disposed on the negative electrode current collector, for example, the negative electrode active material layer may be coated on the negative electrode current collector, and there is a blank foil area at the edge of the negative electrode current collector, and the electrode terminal 12 is electrically connected to the blank foil area, for example, the electrode terminal 12 may be used as a negative electrode terminal or an electrode terminal for sampling.
- the projection of the first fixing member 21 is separated from the projection of the electrode assembly 13 of the battery cell 1 in the battery cell group 10 , which helps to reduce the influence of the first fixing member 21 on the expansion of the electrode assembly 13 .
- the projection of the second fixing member 22 is separated from the projection of the electrode assembly 13 of the battery cell 1 in the battery cell group 10 , which helps to reduce the influence of the second fixing member 22 on the expansion of the electrode assembly 13 .
- the electrochemical device 100 provided in the first aspect of the embodiments of the present application is described in detail below. It should be understood that the contents described below are not intended to limit the embodiments of the present application in any way.
- the electrochemical device 100 provided in the first aspect of the present application may be a secondary battery, and its type may be but is not limited to a lithium ion battery, a sodium ion battery, a lead storage battery, and the like.
- the number of battery cell groups 10 of the electrochemical device 100 is M ⁇ 2, and the number of battery cells 1 in each battery cell group 10 is greater than 1. It can be understood with reference to Figure 2, wherein the battery cells 1 in each battery cell group 10 are stacked in sequence along the first direction F1, and M battery cell groups 10 are arranged in sequence along the first direction F1. The rest of the cases can be deduced by analogy and will not be repeated here.
- the number of conductive members 24 is M-1.
- each battery cell group 10 includes 2 battery cells 1, and there are 7 conductive members 24 in total (i.e., M-1).
- M 8
- M first fixing members 21 may be respectively located on the first side 101 of the M battery cell groups 10, and bonded to at least a portion of the electrode terminal 12 on the first side 101 of each battery cell group 10, and one first fixing member 21 may be located on the first side 101 of one battery cell group 10.
- M second fixing members 22 may be respectively located on the second side 102 of the M battery cell groups 10, and bonded to at least a portion of the electrode terminal 12 on the second side 102 of each battery cell group 10, and one second fixing member 22 may be located on the second side 102 of one battery cell group 10.
- the first fixing member 21 covers the second section 1202 of each electrode terminal 12 to enhance protection of the electrode terminal 11 .
- the second fixing member 22 covers the second section 1202 of each electrode terminal 12 to enhance protection of the electrode terminal 11 .
- the first fixing member 21 covers at least a portion of the battery cell housing to enhance protection of the battery cell housing.
- the second fixing member 22 covers at least a portion of the battery cell housing to enhance protection of the battery cell housing.
- the electrode terminals 12 and the conductive members 24 of two adjacent battery cell groups 10 are connected by welding, and a connection area is formed on the conductive member 24 .
- the welding method is not limited here, such as laser welding, ultrasonic welding.
- the electrode terminals 12 of two adjacent battery cell groups 10 are connected and then connected through other conductive members and the conductive member 24 by welding.
- the electrode terminals 12 and the conductive member 24 of the two battery cell groups 10 are connected by conductive glue, that is, at least one electrode terminal 12 of each of the two battery cell groups 10 is respectively glued to the conductive member 24 by conductive glue, so as to be connected through the conductive member 24 and form a connection area 25 on the conductive member 24.
- the electrode terminals 12 and the conductive members 24 of the two battery cell groups 10 are connected by a mechanical structure, one of the electrode terminal 12 and the conductive member 24 is provided with a recess, and the other is provided with a protrusion, the recess and the protrusion are connected, and a connection area 25 is formed on the conductive member 24.
- one of the two electrode terminals 12 of the battery cell 1 is a positive electrode terminal, and the other is a negative electrode terminal.
- the N battery cells 1 of the electrochemical device 100 in the present application are connected in series or in parallel with each other, and ultimately the positive electrode terminal of at least one battery cell 1 forms the positive electrode of the electrochemical device 100, and the negative electrode terminal of at least one battery cell 1 forms the negative electrode of the electrochemical device 100.
- the number of electrode terminals 12 of the battery cell 1 is greater than two, and at least one electrode terminal 12 can be used to sample physical parameters (voltage, current, etc.) of the battery cell, for example, it can be electrically connected to a battery management system.
- the first fixing member 21 is disposed on the first side 101 of the cell group 10 and the conductive member 24 by means of an injection molding process or a potting process, so as to be bonded to the connection area 25 near the first side 101 of the cell group 10, the second section 1202 of the electrode terminal 11, and at least a portion of the cell casing 11, thereby improving the protection of the connection area 25 formed on the electrode terminal 12 and the conductive member 24.
- the second fixing member 22 is disposed on the second side 102 of the cell group 10 and the conductive member 24 by means of an injection molding process or a potting process, so as to be bonded to the connection area 25 near the second side 102 of the cell group 10, the second section 1202 of the electrode terminal 11, and at least a portion of the cell casing 11, thereby improving the protection of the connection area 25 formed on the electrode terminal 12 and the conductive member 24.
- injection molding can melt the insulating material through an injection molding device, so that the melted insulating material covers the battery cell group 10 and the conductive member 24, and the insulating material is solidified to form the first fixing member 21 or the second fixing member 22 to form a bond.
- the injection molding process of the first fixing member 21 includes: firstly connecting at least one electrode terminal 12 of two battery cell groups 10 adjacent to each other along the first direction F1 through the conductive member 24, for example, by welding the electrode terminals 12 of the two battery cell groups 10 to the conductive member 24 to form a connection, and then performing injection molding on the first side 101 of the battery cell group 10 and the conductive member 24, the connection area 25 formed on the electrode terminal 12 and the conductive member 24, the second section 1202 of the electrode terminal 12, and at least a portion of the battery cell shell 11 are coated with insulating material, and the insulating material is solidified to form the first fixing member 21, thereby making the structure of the injection-molded first fixing member 21 more stable, which is beneficial to improving the protection effect.
- the injection molding process of the second fixing member 22 includes: firstly connecting at least one electrode terminal 12 of two battery cell groups 10 adjacent to each other along the first direction F1 through the conductive member 24, for example, by welding the electrode terminals 12 of the two battery cell groups 10 to the conductive member 24 to form a connection, and then performing injection molding on the second side 102 of the battery cell group 10 and the conductive member 24, the connection area 25 formed on the electrode terminal 12 and the conductive member 24, the second section 1202 of the electrode terminal 12, and at least a portion of the battery cell shell 11 are coated with insulating material, and the second fixing member 22 is formed after the insulating material is cured, thereby making the structure of the injection-molded second fixing member 22 more stable, which is beneficial to improving the protection effect.
- the insulating material (eg, flowable insulating material) may be used to cover the battery cell group 10 and the conductive member 24 by a pouring process, and the insulating material may be solidified to form the first fixing member 21 or the second fixing member 22 to form a bond.
- the insulating material includes a potting glue.
- each first fixing member 21 may be the same or different, which is not limited here.
- the shape and structure of each second fixing member 22 may be the same or different, which is not limited here.
- each battery cell group 10 may include at least one battery cell 1, but the specific number of battery cells 1 in each battery cell group 10 is not limited here. For example, the number of battery cells 1 in each battery cell group 10 may be equal; or, the number of battery cells 1 in each battery cell group 10 may be unequal; or, the number of battery cells 1 in some battery cell groups 10 may be equal.
- a battery cell group 10 includes multiple battery cells 1
- the electrode terminals 12 of the battery cells 1 in the battery cell group 10 can be connected (for example, by welding), and then the connected electrode terminals 12 of the battery cell groups 10 can be connected in sequence (for example, by welding) to form a series or parallel connection between adjacent battery cell groups 10.
- the conductive member 24 connects the electrode terminal 12 on the first side 101 of one of the battery cell groups 10 with the electrode terminal 12 on the second side 102 of another battery cell group 10, and forms a connection area 25 on the conductive member 24, a first fixing member 21 is bonded to at least a portion of the connection area 25, and a second fixing member 22 is bonded to at least a portion of the connection area 25.
- Example 1.2 In the present application, 2 ⁇ M ⁇ N.
- the electrochemical device 100 includes 4 battery cells 1, 2 first fixing members 21, 2 second fixing members 22, and 1 conductive member 24.
- each first fixing member 21 is arranged on the first side 101 of a battery cell group 10, and is bonded to at least a portion of at least one electrode terminal 12 on the first side 101 of the battery cell group 10, and different first fixing members 21 are arranged on the first side 101 of different battery cell groups 10;
- the second fixing member 22 is arranged on the second side 102 of the battery cell group 10, and is bonded to at least a portion of at least one electrode terminal 12 on the second side 102 of the battery cell group 10, and different second fixing members 22 are arranged on the second side 102 of different battery cell groups 10.
- the conductive member 24 connects the electrode terminal 12 on the first side 101 of one of the battery cell groups 10 with the electrode terminal 12 on the second side 102 of another battery cell group 10, and forms a connection area 25 on the conductive member 24, a first fixing member 21 is bonded to at least a portion of the connection area 25, and a second fixing member 22 is bonded to at least a portion of the connection area 25.
- the electrochemical device 100 includes 4 battery cells 1, 3 first fixing members 21, 3 second fixing members 22, and 2 conductive members 24.
- the battery cells 1 in each battery cell group 10 are arranged along the first direction F1, and the 3 battery cell groups 10 are arranged in sequence along the first direction F1;
- each first The fixing member 21 is arranged on the first side 101 of a battery cell group 10 and is bonded to at least a portion of the electrode terminal 12 of the first side 101 of the battery cell group 10, and different first fixing members 21 are arranged on the first sides 101 of different battery cell groups 10;
- each second fixing member 22 is arranged on the second side 102 of a battery cell group 10 and is bonded to at least a portion of the electrode terminal 12 of the second side 102 of the battery cell group 10, and different
- One of the conductive members 24 connects the electrode terminal 12 on the first side 101 of the first battery cell group 10 and the electrode terminal 12 on the second side 102 of the second battery cell group 10, and forms a connection area 25 on the conductive member 24, and the first fixing member 21 of the first battery cell group 10 and the second fixing member 22 of the second battery cell group 10 are at least partially bonded to the connection area 25;
- the other conductive member 24 connects the electrode terminal 12 on the first side 101 of the second battery cell group 10 and the electrode terminal 12 on the second side of the third battery cell group 10, and forms a connection area 25 on the conductive member 24, and the first fixing member 21 of the second battery cell group 10 and the second fixing member 22 of the third battery cell group 10 are at least partially bonded to the connection area 25.
- At least one battery cell group 10 includes a plurality of battery cells 1 , and on a first side 101 of the battery cell group 10 , at least one electrode terminal 12 of at least one battery cell 1 among the plurality of battery cells 1 is bent.
- At least one battery cell group 10 includes a plurality of battery cells 1 , and at least one electrode terminal 12 of at least one battery cell 1 among the plurality of battery cells 1 on the second side 102 of the battery cell group 10 is bent.
- FIG. 4 it shows a situation where a battery cell group 10 includes two battery cells 1, wherein on a first side 101 of the battery cell group 10, at least one electrode terminal 12 of each of the two battery cells 1 is bent, and the bent electrode terminals 12 are welded to form a first electrode terminal connection assembly 121; on a second side 102 of the battery cell group 10, at least one electrode terminal 12 of each of the two battery cells 1 is bent, and the bent electrode terminals 12 are connected by welding.
- a battery cell group 10 includes three battery cells 1. On the first side 101 of the battery cell group 10, at least one electrode terminal 12 of the two battery cells 1 on the outside of the three battery cells 1 is bent, and the electrode terminal 12 of the battery cell 1 in the middle is not bent, and the electrode terminals 12 of the three battery cells 1 are connected by welding; on the second side 102 of the battery cell group 10, at least one electrode terminal 12 of the two battery cells 1 on the outside of the three battery cells 1 is bent, and the electrode terminal 12 of the battery cell 1 in the middle is not bent, and the electrode terminals 12 of the three battery cells 1 are connected by welding. It should be understood that this does not serve as any limitation to the present application.
- the first fixing member 21 of one battery cell group 10 is connected to the second fixing member 22 of the other battery cell group 10, and along the first direction F1, the first fixing member 21 and the second fixing member 22 form a spacing 26, which is conducive to improving the heat dissipation of the battery cell group 10.
- one of the first fixing member 21 and the second fixing member 22 is provided with a convex portion, and the first fixing member 21 and the second fixing member 22 form a spacing 26 through the convex portion. As shown in FIG. 11, the length of the spacing 26 is indicated by T4.
- one of the first fixing member 21 and the second fixing member 22 is provided with a convex portion
- the other of the first fixing member 21 and the second fixing member 22 is provided with a concave portion, wherein along the first direction F1, the length of the convex portion is greater than the length of the concave portion, and the first fixing member 21 and the second fixing member 22 form a spacing 26 through the cooperation of the convex portion and the concave portion, thereby improving the connection stability of the two adjacent battery cell groups 10.
- the first fixing member 21 includes a convex portion and a concave portion
- the second fixing member 22 includes a convex portion and a concave portion
- the convex portion and the concave portion cooperate to form a distance 26 between the first fixing member 21 and the second fixing member 22, further improving the connection stability of two adjacent battery cell groups 10.
- the battery cell group 10 includes a first side 1001 and a second side 1002 opposite to each other, the first fixing member 21 includes a first convex portion 41 and a first concave portion 42, the second fixing member 22 includes a second convex portion 43 and a second concave portion 44, the first convex portion 41 and the second convex portion 43 are located on the first side 1001, and the first concave portion 42 and the second concave portion 44 are located on the second side 1002.
- the first convex portion 41 is disposed on the second concave portion 44, and the second convex portion 43 is disposed on the first concave portion 42, wherein, along the first direction F1, the length of the first convex portion 41 is greater than the length of the second concave portion 44, and the length of the second convex portion 43 is greater than the length of the first concave portion 42, and the first fixing member 21 and the second fixing member 22 form a distance 26 through the cooperation of the convex portion and the concave portion, which is conducive to improving the heat dissipation of the battery cell group 10.
- the length of the first protrusion 41 is equal to the length of the second recess 44
- the length of the second protrusion 43 is equal to the length of the first recess 42 , so as to further improve the connection stability between two adjacent battery cell groups 10 .
- the battery cell group 10 includes a first side 1001 and a second side 1002 opposite to each other, the first fixing member 21 includes a first convex portion 41 and a first concave portion 42, the second fixing member 22 includes a second convex portion 43 and a second concave portion 44, the first convex portion 41 and the second concave portion 44 are located on the first side 1001, the first concave portion 42 and the second convex portion 43 are located on the second side 1002, and the second convex portion 43 is disposed on the first concave portion 42 of two adjacent battery cell groups 10, wherein, along the first direction F1, the length of the second convex portion 43 is greater than the length of the first concave portion 42, and the first fixing member 21 and the second fixing member 22 form a spacing 26 through the cooperation of the second convex portion 43 and the first concave portion 42, which is conducive to improving the heat dissipation of the battery cell group 10.
- the first fixing member 21 includes a first convex portion 41 and a first con
- the first fixing member 21 includes a first sleeve 210.
- the wall thickness of the first sleeve 210 satisfies greater than or equal to 1 mm and less than or equal to 5 mm.
- the wall thickness of the first sleeve 210 is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., which is conducive to improving the protection effect of the electrode terminal.
- the wall thickness of the first sleeve 210 along the first direction F1 is shown as T5 in Figure 11.
- the second fixing member 22 includes a second sleeve 220.
- the wall thickness of the second sleeve 220 satisfies greater than or equal to 1 mm and less than or equal to 5 mm.
- the wall thickness of the second sleeve 220 is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., which is conducive to improving the protection effect of the electrode terminal.
- the wall thickness of the second sleeve 220 along the first direction F1 is shown as T5 in Figure 11.
- the electrochemical device 100 further includes an elastic member 5, which is disposed between two adjacent battery cell groups 10, and the elastic member 5 is connected to at least one of the two battery cell groups 10.
- the battery cell group 10 compresses the elastic member 5, and the elastic member 5 is deformed, thereby providing a deformation space for the expanded battery cell 1.
- the elastic member 5 may be connected to the battery cell group 10 in a bonding manner, so as to contact at least one of the two battery cell groups 10.
- the bonding may be performed by glue, double-sided tape, etc., which is not limited here.
- the elastic member 5 includes foam.
- Foam is a material made by foaming plastic particles. Foam has a series of characteristics such as good elasticity, light weight, rapid pressure-sensitive fixation, easy use, flexible bending, ultra-thin volume, and reliable performance.
- the types of foam include PU foam, anti-static foam, conductive foam, EPE foam, anti-static EPE foam, CR foam, EVA foam, cross-linked PE foam, SBR foam, EPDM foam, etc.
- the present application does not limit the type of the elastic member 5 when it includes foam.
- the elastic member 5 includes a spring.
- the elastic member 5 includes a first plate, a second plate, and a spring, the spring is connected between the first plate and the second plate, the first plate is connected to one of the two adjacent battery cell groups 10 along the first direction F1, and the second plate is connected to the other of the two battery cell groups 10.
- the first plate and/or the second plate moves to compress the spring, the spring deforms and supports the expanded battery cell 1, and buffers the pressure generated when the battery cell 1 expands, and improves the situation where the battery cells 1 of the electrochemical device 100 are superimposed and displaced along the first direction F1 due to expansion.
- the thickness of the elastic member 5 when not compressed by the battery cell is T1, along the first direction F1, the spacing formed between two adjacent battery cell groups in the first direction F1 is T2, the thickness of the battery cell 1 when not undergoing a charge and discharge cycle is T3, and half of the sum of the number of battery cells 1 in two adjacent battery cell groups 10 along the first direction F1 is X, then T1, T2, T3, and X satisfy: T2-X*T3*20% ⁇ T1 ⁇ T2.
- X is a decimal when only one of the number of battery cells 1 of two adjacent battery cell groups 10 along the first direction F1 is an odd number, and X is an integer in other cases.
- the elastic member 5 may only contact the battery cell 1 of the first battery cell group 10 of two adjacent battery cell groups 10 (respectively referred to as the first battery cell group 10 and the second battery cell group 10) along the first direction F1; and when the battery cell 1 of the battery cell group 10 expands to 20% of the initial thickness, the elastic member 5 begins to contact the battery cell 1 of the second battery cell group 10, and in the subsequent expansion process, the elastic member 5 is compressed and supports the expansion of the battery cell 1, thereby reducing the risk of tearing of the outer packaging of the battery cell 1 (for example, made of metal plastic film) due to expansion, and buffering the pressure generated when the battery cell 1 expands, and improving the situation where the battery cells 1 of the electrochemical device 100 are superimposed and displaced along the first direction F1 due to expansion, thereby meeting the use requirements of the electrochemical device 100.
- the elastic member 5 can contact two adjacent battery cell groups 10 along the first direction F1 at the same time.
- the elastic member 5 is compressed and supports the expanded battery cell 1, thereby reducing the risk of tearing of the outer packaging of the battery cell 1 (for example, made of metal plastic film) due to expansion, buffering the pressure generated by the expansion of the battery cell 1, and improving the situation where the battery cells 1 of the electrochemical device 100 are superimposed and displaced along the first direction F1 due to expansion, thereby meeting the use requirements of the electrochemical device 100.
- T1, T2, T3, and X satisfy the following: T2-X*T3*15% ⁇ T1 ⁇ T2-X*T3*0.5%.
- one side of the elastic member 5 along the first direction F1 is not in contact with the battery cell 1 of the battery cell group 10.
- the elastic member 5 can contact the battery cells 1 of the battery cell group 10 on both sides at the same time, and then the elastic member 5 is compressed and supports the expansion of the battery cell 1, thereby reducing the risk of tearing of the outer packaging of the battery cell 1 (for example, made of metal plastic film) due to expansion, and buffering the pressure generated when the battery cell 1 expands, thereby improving the situation where the battery cells 1 of the electrochemical device 100 are superimposed and displaced along the first direction F1 due to expansion, thereby meeting the use requirements of the electrochemical device 100.
- the electrochemical device 100 further includes a housing 4, and the housing 4 includes a first wall 401 and a second wall 402 that are arranged opposite to each other along a first direction F1.
- An elastic structure such as foam may be provided between the first wall 401 and the M battery cell groups 10, and an elastic structure such as foam may be provided between the second wall 402 and the M battery cell groups 10, which is not limited here.
- the housing 4 includes a third wall 403 and a fourth wall 404 that are arranged opposite to each other along a third direction F3, and the third direction F3 is perpendicular to the first direction F1 and the second direction F2. At least one of the third wall 403 and the fourth wall 404 is provided with a fifth protrusion 71, and along the first direction F1, the fifth protrusion 71 is provided between the adjacent first fixing member 21 and the second fixing member 22 to limit the movement of the battery cell group 10.
- the first fixing member 21 is provided with at least one first through hole 61, which penetrates the first fixing member 21 along the third direction F3; and/or the second fixing member 22 is provided with at least one first through hole 61, which penetrates the second fixing member 22 along the third direction F3; wherein the third direction F3 is perpendicular to the first direction F1 and the second direction F2.
- This is beneficial to the heat dissipation of the electrode terminal 12 to which the first fixing member 21 and/or the second fixing member 22 are bonded.
- the third wall 403 and/or the fourth wall 404 is provided with a second through hole 62, and the second through hole 62 is communicated with the first through hole 61.
- such a structure can further enhance the heat dissipation effect.
- an electrochemical device 100 comprising: N battery cells 1, A first fixing members 21, A second fixing members 22, and (L-1)*A third fixing members 23, wherein N, M, and L are all positive integers and 2 ⁇ M ⁇ N, and L ⁇ 2; the N battery cells 1 are divided into M battery cell groups 10, and the M battery cell groups are divided into A rows and L columns.
- the battery cell groups 10 include first fixing members 21 and 22 arranged relatively to each other.
- each battery cell group 10 includes at least one battery cell 1, and the battery cells 1 in the battery cell group 10 are arranged along a first direction F1, and the second direction F2 is perpendicular to the first direction F1;
- the battery cell 1 includes a battery cell shell 11 and two electrode terminals 12, and the two electrode terminals 12 are relatively arranged on both sides of the battery cell shell 11 along the second direction F2; wherein, in a row of battery cell groups A1, the first fixing member 21 is located on the first side 101 of the first battery cell group 10 in the row of battery cell groups A1, and is bonded to at least part of the electrode terminal 12 of the first side 101 of the first battery cell group 10; the second fixing member 22 is located on the first side 101 of the battery cell group A1
- the second side 102 of the last cell group 10 in A1 is bonded to at least a portion of the electrode terminal 12 of the second side 102 of the last cell group 10; in a row of cell groups A1, the electrode terminals 12 of two adjacent cell groups 10 are connected,
- the electrochemical device 100 provided in the second aspect of the embodiments of the present application is described in detail below. It should be understood that the contents described below do not constitute any limitation to the embodiments of the present application.
- the electrochemical device 100 provided in the second aspect of the present application may be a secondary battery, and its type may be but is not limited to a lithium ion battery, a sodium ion battery, a lead storage battery, and the like.
- each battery cell includes an electrode assembly 13, a battery cell shell 11 and an electrode terminal 12, the electrode assembly 13 is disposed in the battery cell shell 11, and the electrode terminal 12 is connected to the electrode assembly 13 and extends out of the battery cell shell 11.
- the electrode terminal 12 includes two, one of which is a positive electrode terminal and the other is a negative electrode terminal.
- the positive electrode terminal and the negative electrode terminal are disposed at the same end of the battery cell shell 11.
- the positive electrode terminal and the negative electrode terminal are disposed at opposite ends of the battery cell shell 11. This specification takes the example of the positive electrode terminal and the negative electrode terminal being disposed at opposite ends of the battery cell shell 11.
- the electrode terminal 12 includes a first section 1201 located inside the cell casing 11 and a second section 1202 located outside the cell casing 11 .
- the first section 1201 is connected to the electrode assembly 13 .
- the electrode assembly 13 may include a positive electrode sheet, a negative electrode sheet, and a separator, wherein the separator is located between the positive electrode sheet and the negative electrode sheet.
- the electrode assembly 13 may be formed by winding the positive electrode sheet, the separator, and the negative electrode sheet, or by stacking the positive electrode sheet, the separator, and the negative electrode sheet.
- the relevant contents of the positive electrode sheet, the separator, and the negative electrode sheet may refer to the relevant technology, and no limitation is made in this application.
- the positive electrode sheet may include a positive active material layer and a positive current collector, wherein the positive active material layer is disposed on the positive current collector, for example, the positive active material layer may be coated on the positive current collector, and there is a blank foil area at the edge of the positive current collector, and the electrode terminal 12 is connected to the blank foil area, for example, the electrode terminal 12 may be used as a positive electrode terminal or an electrode terminal for sampling.
- the negative electrode plate may include a negative electrode active material layer and a negative electrode current collector, wherein the negative electrode active material layer is disposed on the negative electrode current collector, for example, the negative electrode active material layer may be coated on the negative electrode current collector, and there is a blank foil area at the edge of the negative electrode current collector, and the electrode terminal 12 is electrically connected to the blank foil area, for example, the electrode terminal 12 may be used as a negative electrode terminal or an electrode terminal for sampling.
- the projection of the first fixing member 21 is separated from the projection of the electrode assembly 13 of the battery cell 1 in the battery cell group 10, thereby reducing the influence of the first fixing member 21 on the expansion of the electrode assembly 13.
- the electrode assembly 13 is represented by a dotted frame.
- the projection of the second fixing member 22 is separated from the projection of the electrode assembly 13 of the battery cell 1 in the battery cell group 10, thereby reducing the influence of the second fixing member 22 on the expansion of the electrode assembly 13.
- the electrode assembly 13 is represented by a dotted frame.
- the projection of the third fixing member 23 is separated from the projection of the electrode assembly 13 of the battery cell 1 in the battery cell group 10, thereby reducing the influence of the third fixing member 23 on the expansion of the electrode assembly 13.
- the electrode assembly 13 is represented by a dotted frame.
- 16 battery cell groups 10 are arranged into an even number of rows of battery cell groups, specifically, 16 battery cell groups 10 are arranged into 8 rows of battery cell groups, each row of battery cell groups includes 2 battery cell groups 10, and the 8 rows of battery cell groups are stacked along the first direction F1.
- the electrochemical device 100 includes 8 first fixing members 21 and 8 second fixing members 22. Along the first direction F1, adjacent battery cell groups 10 are connected by a conductive member 24.
- the electrode terminal 12 of the first side 101 of one battery cell group 10 is connected to the electrode terminal 12 of the second side 102 of the other battery cell group 10 by the conductive member 24, and a connection area 25 is formed on the conductive member 24, one first fixing member 21 is bonded to at least part of the connection area 25, and 7 first fixing members 21 are bonded to at least part of 7 connection areas 25.
- adjacent cell groups 10 are connected by the conductive member 24.
- the electrode terminal 12 on the first side 101 of one cell group 10 is connected to the electrode terminal 12 on the second side 102 of the other cell group 10 by the conductive member 24, and a connection area 25 is formed on the conductive member 24.
- a second fixing member 22 is bonded to at least part of the connection area 25, and seven second fixing members 22 are bonded to at least parts of the seven connection areas. After the eight rows of cell groups are connected, a positive connection terminal and a negative connection terminal are formed. A first fixing member 21 is bonded to the electrode terminal 12 of the positive connection terminal 27, and a second fixing member 22 is bonded to the electrode terminal 12 of the negative connection terminal 28.
- the electrochemical device 100 includes 9 first fixing members, 9 second fixing members, and 9 third fixing members. Along the first direction F1, adjacent battery cell groups 10 are connected by a conductive member 24.
- the electrode terminal 12 of the first side 101 of one battery cell group 10 is connected to the electrode terminal 12 of the second side 102 of the other battery cell group 10 through the conductive member 24, and a connection area 25 is formed on the conductive member 24, and one first fixing member 21 is bonded to at least part of the connection area 25, and 8 first fixing members 21 are bonded to at least part of 8 connection areas 25.
- adjacent cell groups 10 are connected by the conductive member 24.
- the electrode terminal 12 on the first side 101 of one cell group 10 is connected to the electrode terminal 12 on the second side 102 of the other cell group 10 by the conductive member 24, and a connection area 25 is formed on the conductive member 24.
- a second fixing member 22 is bonded to at least part of the connection area 25, and eight second fixing members 22 are bonded to at least parts of the eight connection areas. After the nine rows of cell groups are connected, a positive electrode connection end and a negative electrode connection end are formed. One of the second fixing member 22 and the first fixing member 21 is bonded to the electrode terminal 12 of the positive electrode connection end, and the other is bonded to the electrode terminal 12 of the negative electrode connection end.
- the A row of cell groups are stacked in sequence along the first direction F1.
- the first row of cell groups A1 and the second row of cell groups A2 are used as an example for description.
- the first row of cell groups A1 and the second row of cell groups A2 are stacked along the first direction F1, the first row of cell groups A1 includes at least 2 cell groups 10 arranged along the second direction F2, and the second row of cell groups A2 includes at least 2 cell groups 10 arranged along the second direction F2.
- the first row of cell groups A1 includes 2 cell groups 10 arranged along the second direction F2, and the second row of cell groups A2 includes 2 cell groups 10 arranged along the second direction F2.
- the first row of cell groups A1 includes cell groups A1-1 and A1-2, and the second row of cell groups A2 includes cell groups A2-1 and A2-2.
- the electrode terminals 12 of two adjacent cell groups A1-1 and the electrode terminals 12 of the cell group A2-1 are connected by a conductive member 24, and a connecting area 25 is formed on the conductive member 24.
- the connection methods include laser welding connection and ultrasonic welding connection.
- the electrode terminals 12 of two adjacent battery cell groups A1-2 and the electrode terminals 12 of the battery cell group A2-2 are connected by a conductive member 24, and a connection area 25 is formed on the conductive member 24, and the connection method includes laser welding connection and ultrasonic welding connection.
- the electrode terminal 12 and the conductive member 24 are connected by a mechanical structure, one of the electrode terminal 12 and the conductive member 24 is provided with a recess, and the other of the electrode terminal 12 and the conductive member 24 is provided with a protrusion, the recess and the protrusion are connected, and a connection area 25 is formed on the conductive member 24.
- the electrode terminal 12 and the conductive member 24 are connected by conductive glue, and at least one electrode terminal 12 of each of the two battery cell groups 10 is respectively glued to the conductive member 24 by conductive glue to be connected through the conductive member 24 and form a connection area 25 on the conductive member 24.
- the electrode terminals 12 of two adjacent battery cell groups 10 are connected and then connected through other conductive members and the conductive member 24 by welding.
- one of the two electrode terminals 12 of the battery cell 1 is a positive electrode terminal, and the other is a negative electrode terminal.
- the N battery cells 1 of the electrochemical device 100 in the present application are connected in series or in parallel with each other, and ultimately the positive electrode terminal of at least one battery cell 1 forms the positive electrode of the electrochemical device 100, and the negative electrode terminal of at least one battery cell 1 forms the negative electrode of the electrochemical device 100.
- the first fixing member 21 of one battery cell group 10 is connected to the second fixing member 22 of the other battery cell group 10, and along the first direction F1, the first fixing member 21 and the second fixing member 22 form a distance, which is conducive to improving the heat dissipation of the battery cell group 10.
- one of the first fixing member 21 and the second fixing member 22 is provided with a convex portion, and the first fixing member 21 and the second fixing member 22 form a distance 26 through the convex portion.
- one of the first fixing member 21 and the second fixing member 22 is provided with a convex portion
- the other of the first fixing member 21 and the second fixing member 22 is provided with a concave portion, wherein, along the first direction F1, the length of the convex portion is greater than the length of the concave portion, and the first fixing member 21 and the second fixing member 22 form a distance 26 through the cooperation of the convex portion and the concave portion, thereby improving the connection stability of the two adjacent battery cell groups 10.
- the first fixing member 21 includes a convex portion and a concave portion
- the second fixing member 22 includes a convex portion and a concave portion
- the convex portion and the concave portion cooperate to form a distance 26 between the first fixing member 21 and the second fixing member 22, further improving the connection stability of two adjacent battery cell groups 10.
- the battery cell group 10 includes a first side 1001 and a second side 1002 opposite to each other, the first fixing member 21 includes a first convex portion 41 and a first concave portion 42, the second fixing member 22 includes a second convex portion 43 and a second concave portion 44, the first convex portion 41 and the second convex portion 43 are located on the first side 1001, and the first concave portion 42 and the second concave portion 44 are located on the second side 1002.
- the first convex portion 41 is disposed on the second concave portion 44, and the second convex portion 43 is disposed on the first concave portion 42, wherein, along the first direction F1, the length of the first convex portion 41 is greater than the length of the second concave portion 44, and the length of the second convex portion 43 is greater than the length of the first concave portion 42, and the first fixing member 21 and the second fixing member 22 form a spacing 26 through the cooperation of the convex portion and the concave portion, which is conducive to improving the heat dissipation of the battery cell group 10.
- the length of the first convex portion is equal to the length of the second concave portion
- the length of the second convex portion is equal to the length of the first concave portion
- the battery cell group 10 includes a first side 1001 and a second side 1002 opposite to each other, the first fixing member 21 includes a first convex portion 41 and a first concave portion 42, the second fixing member 22 includes a second convex portion 43 and a second concave portion 44, the first convex portion 41 and the second concave portion 44 are located on the first side 1001, the first concave portion 42 and the second convex portion 43 are located on the second side 1002, and the second convex portion 43 is disposed on the first concave portion 42 for two adjacent battery cell groups 10, wherein, along the first direction F1, the length of the second convex portion 43 is greater than the length of the first concave portion 42, and the first fixing member 21 and the second fixing member 22 form a spacing 26 through the cooperation of the second convex portion 43 and the first concave portion 42, which is conducive to improving the heat dissipation of the battery cell group 10.
- the first fixing member 21 includes a first convex portion 41 and a first con
- the third fixing member 23 of one battery cell group 10 is connected to the third fixing member 23 of the other battery cell group 10, and along the first direction F1, a spacing 29 is formed between the two third fixing members 23, which is conducive to improving the heat dissipation of the battery cell group 10.
- one of the two third fixing members 23 is provided with a convex portion, and the spacing 29 is formed between the two third fixing members 23 through the convex portion.
- one of the two third fixing members 23 is provided with a convex portion, and the other of the two third fixing members 23 is provided with a concave portion, wherein along the first direction F1, the length of the convex portion is greater than the length of the concave portion, and the spacing 29 is formed between the two third fixing members 23 through the cooperation of the convex portion and the concave portion, thereby improving the connection stability of the two adjacent battery cell groups 10.
- both of the two third fixing members 23 include a convex portion and a concave portion, and the spacing is formed between the two third fixing members 23 through the cooperation of the convex portion and the concave portion, thereby further improving the connection stability of the two adjacent battery cell groups 10.
- the battery cell group 10 includes a first side 1001 and a second side 1002 opposite to each other, and the third fixing member 23 includes a third protrusion 45, a third recess 46, a fourth protrusion 47 and a fourth recess 48, wherein the third protrusion 45 and the fourth protrusion 47 are located on the first side 1001, and the third recess 46 and the fourth recess 48 are located on the second side 1002.
- the third protrusion 45 is arranged at the fourth recess 48, and the fourth protrusion 47 is arranged at the third recess 46, wherein, along the first direction F1, the length of the third protrusion 45 is greater than the length of the fourth recess 48, and the length of the fourth protrusion 47 is greater than the length of the third recess 46, and the cooperation of the protrusion and the recess forms a spacing 29 between two adjacent third fixing members 23, which is beneficial to improve the heat dissipation of the battery cell group 10.
- the length of the third protrusion 45 is equal to the length of the fourth recess 48
- the length of the fourth protrusion 47 is equal to the length of the third recess 46, further improving the connection stability of the two adjacent battery cell groups 10.
- the length of the interval 29 is indicated by T7 .
- the battery cell group 10 includes a first side 1001 and a second side 1002 that are opposite to each other, and the third fixing member 23 includes a third protrusion 45, a third recess 46, a fourth protrusion 47 and a fourth recess 48, wherein the third recess 46 and the fourth protrusion 47 are located on the first side 1001, and the third protrusion 45 and the fourth recess 48 are located on the second side 1002.
- the fourth protrusion 47 of one battery cell group is disposed at the third recess 46 of the other battery cell group 10 and the third protrusion 45 of one battery cell group is disposed at the fourth recess 48 of the other battery cell group 10, wherein, along the first direction F1, the length of the fourth protrusion 47 is greater than the length of the third recess 46, and the length of the third protrusion 45 is greater than the length of the fourth recess 48, and through the cooperation between the fourth protrusion 47 and the third recess 46 and the cooperation between the third protrusion 45 and the fourth recess 48, a spacing 29 is formed between two adjacent third fixing members 23, which is beneficial to improving the heat dissipation of the battery cell group 10.
- the length of the fourth protrusion 47 is equal to the length of the third recess 46 , so as to further improve the connection stability of two adjacent battery cell groups 10 .
- the first fixing member 21 includes a first sleeve 210.
- the wall thickness of the first sleeve 210 satisfies greater than or equal to 1 mm and less than or equal to 5 mm.
- the wall thickness of the first sleeve 210 is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., which is conducive to improving the protection effect of the electrode terminal.
- the second fixing member 22 includes a second sleeve 220.
- the wall thickness of the second sleeve 220 satisfies greater than or equal to 1 mm and less than or equal to 5 mm.
- the wall thickness of the second sleeve 220 is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., which is conducive to improving the protection effect of the electrode terminal.
- the third fixing member 23 includes a third sleeve 231 and a fourth sleeve 232.
- the wall thickness of the third sleeve 231 satisfies greater than or equal to 1mm and less than or equal to 5mm.
- the wall thickness of the third sleeve 231 is 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc., which is conducive to improving the protection effect of the electrode terminal.
- the wall thickness of the fourth sleeve 232 satisfies greater than or equal to 1mm and less than or equal to 5mm.
- the wall thickness of the fourth sleeve 232 is 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc., which is conducive to improving the protection effect of the electrode terminal.
- the wall thickness of the third sleeve 231 along the first direction F1 is shown in T6 of FIG23.
- the wall thickness of the fourth sleeve 232 along the first direction F1 is shown as T6 in FIG. 23 .
- the first fixing member 21 is disposed on the first side 101 of the battery cell group 10 and the conductive member 24 by an injection molding process or a perfusion process, so as to be bonded to at least a portion of the connection area 25 near the first side 101 of the battery cell group 10. The protection of the electrode terminal 12 and the connection area 25 formed on the conductive member 24 is improved.
- the first fixing member 21 is disposed on the first side 101 of the cell group 10 and the conductive member 24 by an injection molding process or a perfusion process, so as to be bonded to the connection area 25 near the first side 101 of the cell group 10, the second section 1202 of the electrode terminal 12, and at least a portion of the cell housing 11.
- the protection of the connection area 25 formed on the electrode terminal 12 and the conductive member 24 is improved.
- the second fixing member 22 is disposed on the second side 102 of the cell group 10 and the conductive member 24 by an injection molding process or a perfusion process, so as to be bonded to at least a portion of the connection area 25 near the second side 102 of the cell group 10. The protection of the connection area 25 formed on the electrode terminal 12 and the conductive member 24 is improved.
- the second fixing member 22 is disposed on the second side 102 of the cell group 10 and the conductive member 24 by an injection molding process or a perfusion process, so as to be bonded to the connection area 25 near the second side 102 of the cell group 10, the second section 1202 of the electrode terminal 12, and at least a portion of the cell housing 11.
- the protection of the connection area 25 formed on the electrode terminal 12 and the conductive member 24 is improved.
- the third fixing member 22 is arranged on the first side 101 and the second side 102 of adjacent battery cell groups 10 in the same row through an injection molding process or a perfusion process, so as to be at least partially bonded to the area where the adjacent battery cell groups 10 are interconnected, thereby improving the structural strength of the first side 101 and the second side 102 of the adjacent battery cell groups 10 and improving the service life of the battery cell groups 10.
- the third fixing member 22 is disposed on the first side 101 and the second side 102 of the adjacent battery cell groups 10 in the same row by an injection molding process or a perfusion process, and the second section 1202 is bonded to at least a portion of the battery cell housing 11, thereby improving the protection of the electrode terminal 12 and the connection area 25 formed on the conductive member 24.
- injection molding can melt the insulating material through an injection molding device, so that the melted insulating material covers the battery cell group 10 and the conductive member 24, and the insulating material is solidified to form the first fixing member 21 or the second fixing member 22 to form a bond.
- the injection molding process of the first fixing member 21 includes: firstly connecting at least one electrode terminal 12 of two battery cell groups 10 adjacent to each other along the first direction F1 through a conductive member 24, for example, by welding the electrode terminals of the two battery cell groups 10 to the conductive member 24 to form a connection, and then performing injection molding on the first side 101 of the battery cell group 10 and the conductive member 24 to bond with the connection area 25 close to the first side 101 of the battery cell group 10, the second section 1202 of the electrode terminal 11, and at least a portion of the battery cell shell 11, and the first fixing member 21 is formed after the material is solidified, thereby making the structure of the injection-molded first fixing member 21 more stable, which is beneficial to improving the protection effect.
- the injection molding process of the second fixing member 22 includes: firstly connecting at least one electrode terminal 12 of two battery cell groups 10 adjacent to each other along the first direction F1 through a conductive member 24, for example, by welding the electrode terminals of the two battery cell groups 10 to the conductive member 24 to form a connection, and then performing injection molding on the second side 102 of the battery cell group 10 and the conductive member 24 to bond with the connection area 25 close to the second side 102 of the battery cell group 10, the second section 1202 of the electrode terminal 11, and at least a portion of the battery cell shell 11, and forming the second fixing member 22 after the material is cured, thereby making the structure of the injection-molded second fixing member 22 more stable, which is beneficial to improving the protection effect.
- the injection molding can melt the insulating material through an injection molding device, so that the melted insulating material covers the first side 101 and the second side 102 of the adjacent battery cell group 10, and the insulating material is solidified to form the third fixing member 23 to form a bond.
- the injection molding of the third fixing member 23 includes a preparation process: firstly, the electrode terminals on the first side 101 and the second side 102 of the adjacent battery cell groups 10 in the same row are connected, for example, by welding to form a connection, and then injection molding is performed on the first side 101 and the second side 102, and the connection area formed by the connection of the electrode terminals is coated with the injection molding material, and the third fixing member 22 is formed after the material is solidified.
- the third fixing member 22 covers the connection area formed by the connection of the electrode terminals and the part of the electrode terminals located outside the battery cell shell, which is beneficial to improve the protection effect.
- the insulating material (eg, flowable insulating material) may be used to cover the battery cell group 10 and the conductive member 24 by a pouring process, and the insulating material may be solidified to form the first fixing member 21 or the second fixing member 22 to form a bond.
- the insulating material includes a potting glue.
- the insulating material (eg, flowable insulating material) may be used to cover the first side 101 and the second side 102 of the adjacent battery cell groups 10 by a pouring process, and the insulating material is cured to form the third fixing member 23 to form a bond.
- the insulating material includes a potting glue.
- each first fixing member 21 may be the same or different, which is not limited here.
- the shape and structure of each second fixing member 22 may be the same or different, which is not limited here.
- At least one battery cell group 10 includes multiple battery cells 1, and on a first side 101 of the battery cell group 10, at least one electrode terminal 1 of at least one battery cell 1 among the multiple battery cells 1 is in a bent shape; and/or, at least one battery cell group 10 includes multiple battery cells 1, and on a second side 102 of the battery cell group 10, at least one electrode terminal 12 of at least one battery cell 1 among the multiple battery cells 1 is in a bent shape.
- FIG. 17 it shows a case where a battery cell group 10 includes two battery cells 1, wherein, on a first side 101 of the battery cell group 10, at least one electrode terminal 12 of each of the two battery cells 1 is bent, and the bent electrode terminals 12 are connected by welding to form a first electrode terminal connection assembly 121; and on a second side 102 of the battery cell group 10, at least one electrode terminal 12 of each of the two battery cells 1 is bent, and the bent electrode terminals 12 are connected by welding to form a second electrode terminal connection assembly 122.
- FIG. 18 it shows a case where a battery cell group 10 includes three battery cells 1.
- At least one electrode terminal 12 of the two battery cells 1 on the outside of the three battery cells 1 is bent, and the electrode terminal 12 of the battery cell 1 in the middle is not bent, and the electrode terminals 12 of the three battery cells 1 are electrically connected by welding; on the second side 102 of the battery cell group 10, at least one electrode terminal 12 of the two battery cells 1 on the outside of the three battery cells 1 is bent, and the electrode terminal 12 of the battery cell 1 in the middle is not bent, and the electrode terminals 12 of the three battery cells 1 are electrically connected by welding. It should be understood that this does not serve as any limitation to the present application.
- the electrochemical device 100 further includes an elastic member 5 ; the elastic member 5 is disposed between two adjacent battery cell groups 10 in the same column of battery cell groups 10 , and the elastic member 5 contacts at least one of the two battery cell groups 10 .
- two adjacent cell groups 10 in the same column of cell groups 10 refer to two adjacent cell groups 10 in the same column of cell groups 10 along the first direction F1 .
- the present application also notes that, when the electrochemical device 100 is in use, the soft-packaged battery cell 1 will expand due to long-term use. Therefore, in the embodiment of the present application, an elastic member 5 is provided between two adjacent battery cell groups 10 in the same column of battery cell groups 10, and the elastic member 5 is in contact with at least one of the two battery cell groups 10. When the battery cell 1 of the battery cell group 10 expands, the battery cell group 10 compresses the elastic member 5, and the elastic member 5 is deformed, thereby supporting the expanded battery cell 1, buffering the pressure generated when the battery cell 1 expands, and improving the situation in which the battery cells 1 of the electrochemical device 100 are superimposed and displaced along the first direction F1 due to expansion.
- the elastic member 5 may be connected to the battery cell group 10 in a bonding manner, so as to contact at least one of the two battery cell groups 10.
- the bonding may be performed by glue, double-sided tape, etc., which is not limited here.
- an elastic member 5 may be provided between two adjacent battery cell groups 10 in each column of battery cell groups 10 .
- the elastic member 5 may include foam.
- Foam is a material made by foaming plastic particles. Foam has a series of characteristics such as elasticity, light weight, rapid pressure-sensitive fixation, easy use, easy bending, ultra-thin volume, and reliable performance.
- the types of foam may include PU foam, anti-static foam, conductive foam, EPE foam, anti-static EPE foam, CR foam, EVA foam, bridged PE foam, SBR foam, EPDM foam, etc.
- the present application does not limit the type of foam when the elastic member 5 includes it, as long as it can meet the use requirements.
- the elastic member 5 may include a spring.
- the elastic member 5 may include a first plate, a second plate, and a spring, wherein the spring is connected between the first plate and the second plate, wherein the first plate is connected to one of two adjacent cell groups 10 in the first direction F1 in the same column of cell groups 10, and the second plate is connected to the other of the two cell groups 10.
- the first plate and/or the second plate are driven to move to compress the spring, and the spring is deformed and supports the expanded cell 1, and buffers the pressure generated when the cell 1 expands, and improves the situation where the cells 1 of the electrochemical device 100 are superimposed and displaced along the first direction F1 due to expansion.
- the thickness of the elastic member when not compressed by the battery cell is T1
- the spacing formed in the first direction between two adjacent battery cell groups in the same column of battery cell groups is T2
- the thickness of the battery cell when not undergoing a charge and discharge cycle is T3
- half of the sum of the number of battery cells in two adjacent battery cell groups in the same column of battery cell groups is X
- these examples are not intended to limit the present application. It can be seen that when only one of the numbers of battery cells 1 of two adjacent battery cell groups 10 in the same column of battery cell groups along the first direction F1 is an odd number, X is a decimal, and in other cases, X is an integer.
- the elastic member 5 can only contact the battery cells 1 of the first battery cell group 10 of two adjacent battery cell groups 10 (respectively recorded as the first battery cell group 10 and the second battery cell group 10) in the same column of battery cell groups along the first direction F1; and when the battery cells 1 of the battery cell group 10 expand to 20% of the initial thickness, the elastic member 5 begins to contact the battery cells 1 of the second battery cell group 10.
- the elastic member 5 is compressed and supports the expansion of the battery cells 1 to prevent the battery cells 1 from over-expanding, thereby reducing the risk of tearing of the outer packaging of the battery cells 1 (for example, made of metal plastic film) due to expansion, and buffering the pressure generated when the battery cells 1 expand, and improving the situation where the battery cells 1 of the electrochemical device 100 are superimposed and displaced along the first direction F1 due to expansion, thereby meeting the use requirements of the electrochemical device 100.
- the elastic member 5 can simultaneously contact two adjacent battery cell groups 10 in the same column of battery cell groups along the first direction F1.
- the elastic member 5 is compressed and supports the expanded battery cell 1 to prevent the battery cell 1 from over-expanding, thereby reducing the risk of tearing of the outer packaging of the battery cell 1 (for example, made of metal plastic film) due to expansion, buffering the pressure generated by the expansion of the battery cell 1, and improving the situation where the battery cells 1 of the electrochemical device 100 are superimposed and displaced along the first direction F1 due to expansion, thereby meeting the use requirements of the electrochemical device 100.
- T1, T2, T3, and X satisfy the following: T2-X*T3*15% ⁇ T1 ⁇ T2-X*T3*0.5%.
- one side of the elastic member 5 along the first direction F1 does not contact the battery cell 1 of the battery cell group 10.
- the elastic member 5 can contact the battery cells 1 of the battery cell group 10 on both sides at the same time, and then the elastic member 5 is compressed and supports the expansion of the battery cell 1 to prevent the battery cell 1 from over-expanding, thereby better reducing the risk of tearing of the outer packaging of the battery cell 1 (for example, made of metal plastic film) due to expansion, and buffering the pressure generated when the battery cell 1 expands, so as to better improve the situation where the battery cells 1 of the electrochemical device 100 are superimposed and displaced along the first direction F1 due to expansion, thereby meeting the use requirements of the electrochemical device 100.
- the electrochemical device 100 further includes a housing 4, and the housing 4 includes a first wall 401 and a second wall 402 that are arranged opposite to each other along a first direction F1.
- An elastic structure such as foam may be provided between the first wall 401 and the M battery cell groups 10, and an elastic structure such as foam may be provided between the second wall 402 and the M battery cell groups 10, which is not limited here.
- the housing 4 includes a third wall 403 and a fourth wall 404 that are arranged opposite to each other along a third direction F3, and the third direction F3 is perpendicular to the first direction F1 and the second direction F2. At least one of the third wall 403 and the fourth wall 404 is provided with a fifth protrusion 71, and along the first direction F1, the fifth protrusion 71 is provided between the adjacent first fixing member 21 and the second fixing member 22 to limit the movement of the battery cell group 10.
- the first fixing member 21 is provided with at least one first through hole 61, which penetrates the first fixing member 21 along the third direction F3; and/or the second fixing member 22 is provided with at least one first through hole 61, which penetrates the second fixing member 22 along the third direction F3; wherein the third direction F3 is perpendicular to the first direction F1 and the second direction F2.
- This is beneficial to heat dissipation at the electrode terminal 12 to which the first fixing member 21 and/or the second fixing member 22 are bonded.
- the third fixing member 23 is provided with at least one first through hole 61, and the first through hole 61 penetrates the third fixing member 23 along the third direction F3; and wherein the third direction F3 is perpendicular to the first direction F1 and the second direction F2, which is beneficial to the heat dissipation of the electrode terminal 12 to which the third fixing member 23 is bonded.
- the third wall 403 and/or the fourth wall 404 is provided with a second through hole 62, and the second through hole 62 is communicated with the first through hole 61.
- such a structure can further enhance the heat dissipation effect.
- an electrical equipment 200 is also provided, comprising: an electrochemical device 100 as provided in any one of the first aspect or the second aspect.
- the electrical equipment 200 in the embodiment of the present application includes the electrochemical device 100 provided in the embodiment of the present application.
- the electrochemical device 100 has higher safety, stability and service life than the electrochemical devices in the prior art. Therefore, the electrical equipment 200 in the embodiment of the present application has higher safety, stability and service life.
- the preparation flow chart according to the first aspect of the embodiment of the present application includes the following steps:
- Step S101 connecting the electrode terminals 12 of two adjacent battery cell groups 10 of the M battery cell groups 10 through the conductive member 24 , and forming a connection area 25 on the conductive member 24 ;
- Step S102 placing a flowable insulating material on the first side 101 of the cell group 10 and the conductive member 24. After the insulating material is cured, bonding the connection area 25 near the first side 101 of the cell group 10, the portion of the electrode terminal 12 outside the cell housing, and at least a portion of the cell housing 11 to form a first fixing member 21;
- Step S103 a flowable insulating material is disposed on the second side 102 of the cell group 10 and the conductive member 24. After the insulating material is cured, the connection area 25 close to the second side 102 of the cell group 10, the portion of the electrode terminal 12 outside the cell shell, and at least a portion of the cell shell 11 are bonded to form a second fixing member 22.
- step S102 includes melting the insulating material through an injection molding device through an injection molding process, and solidifying the insulating material to form the first fixing member 21 .
- step S102 includes a potting process
- the flowable insulating material can be solidified by the potting process to form the first fixing member 21.
- the flowable insulating material includes a potting glue.
- step S103 includes melting the insulating material through an injection molding process using an injection molding device, and solidifying the insulating material to form the second fixing member 22 .
- step S103 includes a pouring process, and the flowable insulating material can be solidified by the pouring process to form the second fixing member 22.
- the flowable insulating material includes a potting glue.
- the preparation flow chart according to the second aspect of the embodiment of the present application includes the following steps:
- Step S201 connecting the electrode terminals 12 of two adjacent cell groups 10 in the same row of cell groups 10, placing a flowable insulating material on the first side 101 and the second side 102 of the two adjacent cell groups 10, and after the insulating material is cured, bonding the second section 1202 of the electrode terminal 12 and at least a portion of the cell casing to form a third fixing member 23;
- Step S202 placing a flowable insulating material on the first side 101 of the first cell group 10 in the row of cell groups 10, and after the insulating material is cured, bonding the portion of the electrode terminal outside the cell shell and at least a portion of the cell shell to form a first fixing member 21;
- Step S203 placing a flowable insulating material on the second side 102 of the last cell group 10 in the row of cell groups 10 , and after the insulating material is cured, bonding the portion of the electrode terminal outside the cell shell and at least a portion of the cell shell to form a second fixing member 22 .
- step S201 includes melting the insulating material through an injection molding device through an injection molding process, and solidifying the insulating material to form the third fixing member 23 .
- step S201 includes a potting process
- the flowable insulating material can be solidified by the potting process to form the third fixing member 23.
- the flowable insulating material includes potting glue.
- step S202 includes melting the insulating material through an injection molding device through an injection molding process, and solidifying the insulating material to form the first fixing member 21 .
- step S202 includes a potting process
- the flowable insulating material can be solidified by the potting process to form the first fixing member 21.
- the flowable insulating material includes potting glue.
- step S203 includes melting the insulating material through an injection molding device through an injection molding process, and solidifying the insulating material to form the second fixing member 22 .
- step S203 includes a potting process
- the flowable insulating material can be solidified by the potting process to form the second fixing member 22.
- the flowable insulating material includes potting glue.
- the preparation flow chart according to the second aspect of the embodiment of the present application further includes the following steps:
- Step S204 providing M-1 conductive members, connecting the electrode terminals on the first side of the first cell group in one of two adjacent rows of cell groups with the electrode terminals on the second side of the first cell group in the other row of cell groups through the conductive members, and forming a connection area 25 on the conductive members;
- Step S205 placing a flowable insulating material on the first side of the battery cell group and the conductive member, and after the insulating material is cured, bonding the connection area 25 close to the first side of the battery cell group;
- Step S206 placing a flowable insulating material on the second side of the cell group and the conductive member, and after the insulating material is cured, bonding the connection area 25 close to the second side of the cell group.
- step S205 includes melting the insulating material through an injection molding device through an injection molding process, and bonding the insulating material to the connection area after solidification.
- step S205 includes a potting process, and the flowable insulating material can be solidified and bonded to the connection area through the potting process.
- the flowable insulating material includes a potting glue.
- step S206 includes melting the insulating material through an injection molding device through an injection molding process, and bonding the insulating material to the connection area after solidification.
- step S206 includes a potting process, and the flowable insulating material can be solidified and bonded to the connection area through the potting process.
- the flowable insulating material includes potting glue.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
Description
Claims (22)
- 一种电化学装置,其特征在于,包括:N个电芯、M个第一固定件、M个第二固定件和M-1个导电件,其中,N、M均为正整数且2≤M≤N;所述N个电芯被分成M个电芯组,每个电芯组包括至少一个电芯,所述电芯组内的电芯沿第一方向设置,所述M个电芯组沿第一方向设置;所述电芯包括电芯壳体和两个电极端子,两个电极端子相对设置于所述电芯壳体沿第二方向上的两侧,其中,所述第二方向为所述第一固定件和所述第二固定件相对设置的方向,且所述第二方向与所述第一方向垂直;沿所述第一方向,相邻两个电芯组的电极端子通过导电件连接,且在所述导电件上形成连接区域;沿所述第二方向,所述电芯组包括相对设置的第一侧和第二侧,其中,所述第一固定件与该电芯组第一侧的电极端子的至少部分粘接,且至少一个第一固定件与所述连接区域的至少部分粘接;和/或,所述第二固定件与该电芯组第二侧的电极端子的至少部分粘接,且至少一个第二固定件与所述连接区域的至少部分粘接。
- 根据权利要求1所述的电化学装置,其特征在于,至少一个电芯组包括多个电芯,在该电芯组的第一侧,所述多个电芯中的每个电芯的电极端子相互连接;和/或,至少一个电芯组包括多个电芯,在该电芯组的第二侧,所述多个电芯中的每个电芯的电极端子相互连接。
- 根据权利要求1所述的电化学装置,其特征在于,相邻两个电芯组中,一个所述电芯组的所述第一固定件与另一个所述电芯组的所述第二固定件连接,所述第一固定件和所述第二固定件在所述第一方向上形成间距。
- 根据权利要求3所述的电化学装置,其特征在于,沿所述第一方向,所述第一固定件和所述第二固定件中的一个设有凸部,所述第一固定件和所述第二固定件通过所述凸部形成间距。
- 根据权利要求4所述的电化学装置,其特征在于,沿所述第一方向,所述第一固定件和所述第二固定件中的另一个设有凹部,所述凸部沿所述第一方向的长度大于所述凹部沿所述第一方向的长度,所述第一固定件和所述第二固定件通过所述凸部和所述凹部的配合形成间距。
- 根据权利要求1所述的电化学装置,其特征在于,所述电芯还包括电极组件,所述电极组件设置于所述电芯壳体内,所述两个电极端子连接于所述电极组件并伸出所述电芯壳体;在同一个电芯组中,沿所述第一方向,所述第一固定件的投影与该电芯组中的电芯的电极组件的投影相离;和/或,在同一个电芯组中,沿所述第一方向,所述第二固定件的投影与该电芯组中的电芯的电极组件的投影相离。
- 根据权利要求1所述的电化学装置,其特征在于,至少一个所述第一固定件通过注塑工艺成型于所述电芯组的第一侧以及所述连接区域的至少部分;和/或,至少一个所述第二固定件通过注塑工艺成型于所述电芯组的第二侧以及所述连接区域的至少部分。
- 根据权利要求7所述的电化学装置,其特征在于,所述第一固定件包覆所述电极端子位于所述电芯壳体外的部分和所述电芯壳体的至少部分;和/或,所述第二固定件包覆所述电极端子位于所述电芯壳体外的部分和所述电芯壳体的至少部分。
- 根据权利要求1所述的电化学装置,其特征在于,所述第一固定件开设有至少一个第一通孔,所述第一通孔沿第三方向贯穿所述第一固定件;和/或,所述第二固定件开设有至少一个第一通孔,所述第一通孔沿第三方向贯穿所述第二固定件,其中,所述第三方向垂直于所述第一方向和所述第二方向。
- 根据权利要求9所述的电化学装置,其特征在于,所述电化学装置还包括外壳;所述外壳包括沿所述第三方向相对设置的第三壁面和第四壁面;所述第三壁面和/或所述第四壁面上开设有第二通孔,所述第二通孔与所述第一通孔相通。
- 一种电化学装置,其特征在于,包括:N个电芯、A个第一固定件、A个第二固定件、(L-1)*A个第三固定件,其中,N、M、L均为正整数且2≤M≤N,L≥2;所述N个电芯被分成M个电芯组,所述M个电芯组被分为A行L列,沿第二方向,所述电芯组包括相对设置的第一侧和第二侧;每个所述电芯组包括至少一个电芯,所述电芯组内的电芯沿第一方向设置,所述第二方向与所述第一方向垂直;所述电芯包括电芯壳体和两个电极端子,两个电极端子相对设置于所述电芯壳体沿所述第二方向上的两侧;其中,在一行电芯组中,所述第一固定件位于该行电芯组中的第一个电芯组的第一侧,并与该第一个电芯组第一侧的电极端子的至少部分粘接;所述第二固定件位于该行电芯组中的最后一个电芯组的第二侧,并与该最后一个电芯组第二侧的电极端子的至少部分粘接;在一行电芯组中,相邻的两个电芯组的电极端子连接,所述第三固定件分别与相邻的两个电芯组连接,所述第三固定件与该相邻的两个电芯组中的一个电芯组的第二侧的电极端子的至少部分粘接,且所述第三固定件与该相邻的两个电芯组中的另一个电芯组的第一侧的电极端子的至少部分粘接。
- 根据权利要求11所述的电化学装置,其特征在于;所述A行电芯组沿所述第一方向依次堆叠设置;所述电化学装置还包括A-1个导电件;相邻的两行电芯组中,其中一行电芯组中的第一个电芯组的第一侧的电极端子与另一行电芯组中的第一个电芯组的第二侧的电极端子通过所述导电件连接,且在所述导电件上形成连接区域,至少一个所述第一固定件与该连接区域的至少部分粘接,和/或,至少一个所述第二固定件与该连接区域的至少部分粘接。
- 根据权利要求12所述的电化学装置,其特征在于,至少一个所述第一固定件通过注塑工艺成型于该行电芯组中的第一个电芯组的第一侧以及所述连接区域的至少部分;和/或,至少一个所述第二固定件通过注塑工艺成型于该行电芯组中的最后一个电芯组的第二侧以及所述连接区域的至少部分;和/或,在一行电芯组中相邻的两个电芯组,至少一个所述第三固定件通过注塑工艺成型于一个电芯组的第二侧以及另一个电芯组的第一侧。
- 根据权利要求13所述的电化学装置,其特征在于,所述第一固定件包覆所述电极端子位于所述电芯壳体外的部分和所述电芯壳体的至少部分;和/或,所述第二固定件包覆所述电极端子位于所述电芯壳体外的部分和所述电芯壳体的至少部分;和/或,所述第三固定件包覆所述电极端子位于所述电芯壳体外的部分和所述电芯壳体的至少部分。
- 根据权利要求11-13任一项所述的电化学装置,其特征在于,所述第一固定件开设有至少一个第一通孔,所述第一通孔沿第三方向贯穿所述第一固定件;和/或,所述第二固定件开设有至少一个第一通孔,所述第一通孔沿第三方向贯穿所述第二固定件;和/或,所述第三固定件开设有至少一个第一通孔,所述第一通孔沿第三方向贯穿所述第三固定件;其中,所述第三方向垂直于所述第一方向和所述第二方向。
- 根据权利要求15所述的电化学装置,其特征在于,沿所述第一方向,相邻的两个电芯组中,其中一个所述电芯组中的所述第一固定件与另一个所 述电芯组的所述第二固定件连接,所述第一固定件和所述第二固定件在所述第一方向上形成间距;和/或,沿所述第一方向,相邻的两个电芯组中,其中一个所述电芯组的所述第三固定件与另外一个所述电芯组的所述第三固定件连接,两个所述第三固定件在所述第一方向上形成间距。
- 根据权利要求15所述的电化学装置,其特征在于,所述电芯还包括电极组件,所述电极组件设置于所述电芯壳体内,所述两个电极端子连接于所述电极组件并伸出所述电芯壳体;在同一个电芯组中,沿所述第一方向,所述第一固定件的投影与该电芯组中的电芯的电极组件的投影相离;和/或,在同一个电芯组中,沿所述第一方向,所述第二固定件的投影与该电芯组中的电芯的电极组件的投影相离;和/或,在同一行电芯组中,沿所述第一方向,相邻的两个电芯组之间的所述第三固定件的投影与该两个电芯组中的电芯的电极组件的投影相离。
- 根据权利要求15所述的电化学装置,其特征在于,所述电化学装置还包括外壳,所述外壳包括沿第三方向相对设置的第三壁面以及第四壁面;所述第三壁面和/或所述第四壁面上开设有第二通孔,所述第二通孔与所述第一通孔相通。
- 一种用电设备,其特征在于,包括:如权利要求1-18中任一项所述的电化学装置。
- 一种如权利要求1-10任一项所述的电化学装置的制备方法,其特征在于,所述方法包括:步骤S101:将M个电芯组的相邻两个电芯组的电极端子通过导电件连接,且在导电件上形成连接区域;步骤S102:将可流动的绝缘材料设于电芯组的第一侧以及导电件处,绝缘材料固化后,将靠近该电芯组的第一侧的连接区域、电极端子位于电芯壳体外的部分、电芯壳体的至少部分粘接形成第一固定件;步骤S103:将可流动的绝缘材料设于电芯组的第二侧以及导电件处,绝缘材料固化后,将靠近该电芯组的第二侧的连接区域、电极端子位于电芯壳体外的部分、电芯壳体的至少部分粘接形成第二固定件。
- 一种如权利要求11-18任一项所述的电化学装置的制备方法,其特征在于,所述方法包括:步骤S201:将同一行电芯组中相邻两个电芯组的电极端子连接,将可流动的绝缘材料设于相邻两个电芯组的第一侧和第二侧,绝缘材料固化后,将电极端子位于电芯壳体外的部分、电芯壳体的至少部分粘接形成第三固定件;步骤S202:将可流动的绝缘材料设于该行电芯组中的第一个电芯组的第一侧,绝缘材料固化后,将电极端子位于电芯壳体外的部分、电芯壳体的至少部分粘接形成第一固定件;步骤S203:将可流动的绝缘材料设于该行电芯组中的最后一个电芯组的第二侧,绝缘材料固化后,将电极端子位于电芯壳体外的部分、电芯壳体的至少部分粘接形成第二固定件。
- 根据权利要求21所述的方法,其特征在于,所述方法还包括:步骤S204:提供M-1个导电件,将相邻两行电芯组中的其中一行电芯组中的第一个电芯组的第一侧的电极端子与另一行电芯组中的第一个电芯组的第二侧的电极端子通过导电件连接,且在导电件上形成连接区域;步骤S205:将可流动的绝缘材料设于电芯组的第一侧以及导电件处,绝缘材料固化后,将靠近该电芯组的第一侧的连接区域粘接;步骤S206:将可流动的绝缘材料设于电芯组的第二侧以及导电件处,绝缘材料固化后,将靠近该电芯组的第二侧的连接区域粘接。
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