WO2022082437A1 - 电池和具有所述电池的电子装置 - Google Patents

电池和具有所述电池的电子装置 Download PDF

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Publication number
WO2022082437A1
WO2022082437A1 PCT/CN2020/122221 CN2020122221W WO2022082437A1 WO 2022082437 A1 WO2022082437 A1 WO 2022082437A1 CN 2020122221 W CN2020122221 W CN 2020122221W WO 2022082437 A1 WO2022082437 A1 WO 2022082437A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery
pole piece
conductive member
empty foil
conductive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2020/122221
Other languages
English (en)
French (fr)
Inventor
曾巧
陶兴华
谢再斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningde Amperex Technology Ltd
Original Assignee
Ningde Amperex Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ningde Amperex Technology Ltd filed Critical Ningde Amperex Technology Ltd
Priority to KR1020237011083A priority Critical patent/KR102886153B1/ko
Priority to PCT/CN2020/122221 priority patent/WO2022082437A1/zh
Priority to CN202080017604.0A priority patent/CN113597709B/zh
Priority to EP20958020.8A priority patent/EP4228049B1/en
Priority to CN202211533016.XA priority patent/CN117039353A/zh
Publication of WO2022082437A1 publication Critical patent/WO2022082437A1/zh
Priority to US18/303,035 priority patent/US20230261335A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • H01M50/247—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
    • 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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the technical field of energy storage, and in particular, to a battery and an electronic device having the battery.
  • the battery structure is mainly divided into wound type and laminated type.
  • the common wound structure battery needs to stack the positive pole piece, the negative pole piece and the two-layer separator into a four-layer structure and roll it through a rolling needle. After the winding is completed, the winding needle needs to be extracted to obtain the battery core.
  • the present application provides a battery, including a casing and a battery cell accommodated in the casing.
  • the housing includes a first shell and a second shell that are electrically isolated.
  • the second casing is mounted on the first casing.
  • the battery core includes a first pole piece, a second pole piece, and a diaphragm between the first pole piece and the second pole piece.
  • the battery also includes a first conductive member and a second conductive member that are accommodated in the outer casing and are electrically isolated, the first conductive member is electrically connected to the first pole piece and the first shell, and the second conductive member is electrically connected to the second pole piece and the second conductive member. second shell.
  • the first conductive member and the second conductive member form a conductive structure, and the first pole piece, the diaphragm and the second pole piece are wound around the conductive structure to form a battery core.
  • the starting end of the first pole piece and the starting end of the second pole piece are located between the first conducting member and the second conducting member.
  • the first pole piece and the second pole piece extend in substantially the same direction in the gap between the first conductive member and the second conductive member.
  • the first pole piece includes a first current collector.
  • the first current collector includes a first empty foil area and a first coating film area, the first empty foil area is not provided with a first active material layer, and the first coating film area is provided with a first active material layer.
  • the first conductive member is electrically connected to the first empty foil area.
  • the second pole piece includes a second current collector.
  • the second current collector includes a second empty foil region and a second coating film region, the second empty foil region is not provided with a second active material layer, and the second coating film region is provided with a second active material layer.
  • the second conductive member is electrically connected to the second empty foil area.
  • the first conductive member includes a first connection surface.
  • the second conductive member includes a second connection surface facing the first connection surface.
  • the first connection surface is used for electrically connecting the first empty foil area.
  • the second connection surface is used for electrically connecting the second empty foil area.
  • the first conductive member further includes a first side surface connected to the first connection surface.
  • the second conductive member further includes a second side surface connected to the second connection surface. The first side and the second side together form the outer side of the conductive structure. Part of the first empty foil area and part of the second empty foil area surround the outer side of the conductive structure.
  • the surface areas of the first empty foil area surrounding the outer side of the conductive structure and the second empty foil area surrounding the outer side of the conductive structure are both less than or equal to the surface area of the outer side of the conductive structure.
  • the membrane is also located between the first connection surface and the second connection surface.
  • the diaphragm is used to electrically isolate the first conductive member and the second conductive member.
  • an insulating adhesive layer is provided between the first connection surface and the second connection surface.
  • the insulating adhesive layer is used to electrically isolate the first conductive member and the second conductive member.
  • the width of the first empty foil area is equal to the width of the first film coating area
  • the width of the second empty foil area is equal to the width of the second film coating area width
  • the first conductive member includes a first end electrically connected to the first housing and a second end opposite to the first end.
  • the second conductive member includes a third end electrically connected to the second housing and a fourth end opposite to the third end.
  • the first end protrudes from the fourth end, and the third end protrudes from the second end.
  • the protruding height of the first end portion compared to the fourth end portion is less than 2 mm
  • the protruding height of the third end portion compared to the second end portion is less than 2 mm
  • the battery further includes a first fixing member.
  • the first fixing member is arranged between the first casing and the battery core.
  • the first fixing member is used for electrically isolating the fourth end portion and the first casing.
  • the first end portion passes through the first fixing member and is electrically connected to the first housing.
  • the battery further includes a second fixing member.
  • the second fixing member is arranged between the second casing and the battery core.
  • the second fixing member is used to electrically isolate the second end portion and the second casing.
  • the third end portion passes through the second fixing member and is electrically connected to the second housing.
  • At least one of the first conductive member and the second conductive member is provided with a positioning hole.
  • the overall shape of the cross-section of the conductive structure is a regular geometric shape.
  • the overall shape of the cross section of the conductive structure is a rectangle, a hexagon, a circle or an ellipse.
  • the present application also provides an electronic device including the above battery.
  • the present application is provided with a conductive structure, and the first pole piece, the separator and the second pole piece can be wound through the conductive structure during preparation. Therefore, the conductive structure can replace the winding needle in the prior art, and the conductive structure does not need to be extracted after winding to form a cell, so the conductive structure can be used as a tab to lead out the electrode polarity of the pole piece, and the conductive structure can make full use of the existing In the technology, the hollow space left at the beginning of the cell winding after the winding needle is pulled out will not occupy additional space between the outer ring of the cell and the shell, improving the utilization rate of the internal space of the battery, thereby improving the energy density of the battery; , because the starting end of the first pole piece and the starting end of the second pole piece are located between the first conductive member and the second conductive member, when winding around the conductive structure, it is convenient to set the active material layer of the first pole piece and The active material layer of the second pole piece is fully corresponding, which reduces the risk of
  • FIG. 1 is a cross-sectional view of a battery according to an embodiment of the present application.
  • FIG. 2 is an exploded view of the battery shown in FIG. 1 .
  • FIG. 3A is a schematic diagram of the first pole piece and the second pole piece of the battery shown in FIG. 1 being wound around the conductive structure.
  • FIG. 3B is a schematic diagram of the first pole piece and the second pole piece of the battery shown in FIG. 1 when they are unfolded.
  • FIG. 4 is a schematic diagram of the conductive structure shown in FIG. 3A .
  • FIG. 5 is a schematic diagram of the conductive structure shown in FIG. 3A in another embodiment.
  • FIG. 6 is a schematic diagram of the conductive structure shown in FIG. 3A in yet another embodiment.
  • FIG. 7 is a schematic diagram of the conductive structure shown in FIG. 3A in still another embodiment.
  • FIG. 8 is a schematic diagram of the conductive structure shown in FIG. 3A in still another embodiment.
  • FIG. 9 is a schematic diagram of the conductive structure shown in FIG. 3A in still another embodiment.
  • FIG. 10 is a schematic diagram of the conductive structure shown in FIG. 3A in still another embodiment.
  • FIG. 11 is a schematic diagram of another angle of the first pole piece shown in FIG. 3B .
  • FIG. 12 is a schematic diagram of another angle of the second pole piece shown in FIG. 3B .
  • FIG. 13 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
  • the first pole piece 21 is the first pole piece 21
  • the first collector 210 The first collector 210
  • the first active material layer 213 is the first active material layer 213
  • the second collector 220 The second collector 220
  • the second active material layer 223 is the second active material layer 223
  • the first opening 400 is the first opening 400
  • an embodiment of the present application provides a battery 100 .
  • the battery 100 of the present application may be a lithium secondary battery, including a lithium metal secondary battery, a lithium ion secondary battery, a lithium polymer secondary battery, and a lithium ion polymer secondary battery.
  • the battery 100 may also be all kinds of primary batteries, secondary batteries, fuel cells, or solar cells.
  • the battery 100 includes a casing 10 and cells 20 accommodated in the casing 10 .
  • the housing 10 includes a first casing 11 and a second casing 12 that are electrically isolated.
  • the second casing 12 is mounted on the first casing 11 .
  • the battery core 20 includes a first pole piece 21 , a second pole piece 22 and a diaphragm 23 located between the first pole piece 21 and the second pole piece 22 .
  • the diaphragm 23 is used to prevent the first pole piece 21 and the second pole piece 22 from being in direct contact, so as to prevent the cell 20 from being short-circuited.
  • the battery 100 further includes a first conductive member 31 and a second conductive member 32 accommodated in the casing 10 and electrically isolated.
  • the first conductive member 31 is electrically connected to the first pole piece 21 and the first casing 11
  • the second conductive member 32 is electrically connected to the second pole piece 22 and the second casing 12 . Therefore, the first pole piece 21 can be electrically connected to the first casing 11 through the first conductive member 31 , so that the first casing 11 and the first pole piece 21 have the same electrical polarity; the second pole piece 22 can be electrically connected through the second pole piece 22 .
  • the conductive member 32 is electrically connected to the second casing 12 , so that the second casing 12 and the second pole piece 22 exhibit the same electrical polarity. Therefore, the electrical connection between the pole piece and the casing 10 can be realized, so that the electrical polarities of the first pole piece 21 and the second pole piece 22 can be drawn out through the first casing 11 and the second casing 12 respectively.
  • the first conductive member 31 and the second conductive member 32 constitute the conductive structure 30
  • the first pole piece 21 , the diaphragm 23 and the second pole piece 22 are wound around the conductive structure 30 to form the cell 20 .
  • the starting end of the first pole piece 21 and the starting end of the second pole piece 22 are both located between the first conducting member 31 and the second conducting member 32 .
  • a conductive structure 30 is provided, and the first pole piece 21 , the separator 23 and the second pole piece 22 can be wound through the conductive structure 30 during preparation. Therefore, the conductive structure 30 can replace the rolling pin in the prior art.
  • the conductive structure 30 does not need to be drawn out, so the conductive structure 30 can be used as a tab to lead out the electrode polarity of the pole piece, and the conductive structure 30 can make full use of the prior art to roll the battery core 20 after the winding needle is drawn out.
  • the present application does not need to weld the tab at the tail of the pole piece, nor does it need to protect the tab with glue and transfer welding, avoiding the need for further welding.
  • the tabs occupy the space between the outer ring of the battery cell and the casing, so as to improve the utilization rate of the internal space of the battery 100 , thereby improving the energy density of the battery 100 .
  • the starting end of the first pole piece 21 and the starting end of the second pole piece 22 are both located between the first conductive member 31 and the second conductive member 32, when winding around the conductive structure 30, it is convenient to set the first The active material layer of the first pole piece 21 and the active material layer of the second pole piece 22 fully correspond to each other, thereby reducing the risk of lithium precipitation of the pole piece and improving the safety of the battery 100 .
  • the conductive structure 30 does not need to be extracted after winding to form the battery core 20, the problem of the separator 23 being brought out or dislocated due to the extraction of the winding needle in the prior art can be avoided, thereby avoiding the first pole piece 21 and the second pole piece 21.
  • the short circuit caused by the direct contact of the sheet 22 further improves the safety of the battery 100 .
  • the conductive structure 30 can also provide support when the center of the casing 10 is sagging and deformed, preventing the inner first pole piece 21 and the second pole piece 22 from being deformed due to the action of the casing 10, and improving the quality of the battery 100.
  • the first pole piece 21 includes a first current collector 210 .
  • the first current collector 210 includes a first empty foil region 212 and a first film coating region 211 .
  • the first empty foil region 212 is not provided with the first active material layer 213
  • the first coating film region 211 is provided with the first active material layer 213 .
  • the first conductive member 31 is electrically connected to the first empty foil region 212 . Therefore, the electrical polarity of the first pole piece 21 can be led out to the first conductive member 31 through the first empty foil region 212 .
  • the second pole piece 22 includes a second current collector 220 .
  • the second current collector 220 includes a second empty foil area 222 and a second film coating area 221 connected to the second empty foil area 222 , the second empty foil area 222 is not provided with the second active material layer 223 , and the second film coating area 221 is provided There is a second active material layer 223 .
  • the second conductive member 32 is electrically connected to the second empty foil region 222 . Therefore, the electrical polarity of the second pole piece 22 can be led out to the second conductive member 32 through the second empty foil region 222 .
  • the first active material layer 213 and the second active material layer 223 may completely correspond.
  • the first conductive member 31 includes a first connection surface 311 .
  • the second conductive member 32 includes a second connection surface 321 facing the first connection surface 311 .
  • the starting end of the first pole piece 21 (ie part of the first empty foil area 212 ) and the starting end of the second pole piece 22 (ie part of the second empty foil area 222 ) are both located on the first connection surface 311 and the second connection surface 321 gap between.
  • the first connection surface 311 is used to electrically connect the first empty foil area 212 .
  • the first empty foil area 212 can be directly attached to the first connection surface 311 .
  • the second connection surface 321 is used to electrically connect the second empty foil area 222 , for example, the second empty foil area 222 can be directly attached to the second connection surface 321 .
  • the first conductive member 31 further includes a first side surface 312 connected to the first connection surface 311 .
  • the second conductive member 32 further includes a second side surface 322 connected to the second connection surface 321 .
  • the first side surface 312 and the second side surface 322 together constitute the outer side surface 300 of the conductive structure 30 . Except that part of the first empty foil area 212 and part of the second empty foil area 222 are located in the gap between the first connection surface 311 and the second connection surface 321, another part of the first empty foil area 212 and another part of the second empty foil area Region 222 surrounds outer side 300 of conductive structure 30 .
  • the surface areas of the first empty foil region 212 surrounding the outer side 300 of the conductive structure 30 and the second empty foil region 222 surrounding the outer side 300 of the conductive structure 30 may both be less than or equal to the surface area of the outer side 300 of the conductive structure 30 .
  • the first pole piece 21 and the second pole piece 22 extend in the same direction in the gap between the first conductive member 31 and the second conductive member 32 .
  • the extension in the same direction mentioned here should be understood to include the situation of extending in approximately the same direction, because in the actual scene, the gap between the first pole piece 21 and the second pole piece 22 between the first conductive member 31 and the second conductive member 32
  • the extension directions in the s may not be exactly the same, but have a certain deviation.
  • the first pole piece 21 and the second pole piece 22 may be wound around the outer side surface 300 of the conductive structure 30 in the same direction.
  • one of the first empty foil area 212 and the second empty foil area 222 may be located in the inner circle of the cell 20 , and the other of the first empty foil area 212 and the second empty foil area 222 may be located in the battery cell 20 the second circle.
  • the first empty foil area 212 is located in the inner circle of the cell 20
  • the second empty foil area 222 is located in the second circle of the cell 20 .
  • the first pole piece 21 and the second pole piece 22 are wound around the outer side 300 of the conductive structure 30 in the counterclockwise direction, the second empty foil area 222 is located in the inner circle of the cell 20, and the first empty foil Region 212 is located on the second turn of cell 20 .
  • the first pole piece 21 and the second pole piece 22 are respectively a positive pole piece and a negative pole piece, and the first pole piece 21 and the second pole piece 22 surround the outer side surface 300 of the conductive structure 30 in a counterclockwise direction
  • the winding is performed so that the second empty foil area 222 is located in the inner circle of the battery core 22 (ie, the negative pole piece is located in the inner circle).
  • the first pole piece 21 and the second pole piece 22 may also be a negative pole piece and a positive pole piece, respectively, which is not limited in this application.
  • the first connection surface 311 and the second connection surface 321 may be set to match in shape, that is, the first connection surface 311 and the second connection surface 321 can be spliced together.
  • the first connection surface 311 and the second connection surface 321 may be planes parallel to each other.
  • the first connecting surface 311 and the second connecting surface 321 may also be convex and concave curved surfaces, respectively.
  • the first connecting surface 311 and the second connecting surface 321 may be both sawtooth surfaces, and the convex peaks and the concave valleys of the two sawtooth surfaces correspond one-to-one. In this way, the gap between the first connection surface 311 and the second connection surface 321 can be reduced, the space waste between the first conductive member 31 and the second conductive member 32 can be avoided, and the space utilization rate inside the battery 100 can be further improved.
  • the overall shape of the cross-section of the conductive structure 30 is a regular geometric shape.
  • the overall shape of the cross-section of the conductive structure 30 can be set according to the desired shape of the cell 20 , that is, after the cell 20 is wound around the conductive structure 30 to form the cell 20 , the cell 20 can present a shape that is approximately the same as the cross-section of the conductive structure 30 .
  • the overall shape of the cross-section of the conductive structure 30 may be circular.
  • the overall shape of the cross-section of the conductive structure 30 may also be a rectangle, a hexagon or an ellipse.
  • the first conductive member 31 and the second conductive member 32 may be provided with a positioning hole 33 .
  • the first conductive member 31 and/or the second conductive member 32 can be installed on the winding machine (not shown) through the positioning hole 33 .
  • the winding machine can drive the first conductive member 31 or the second conductive member 32 to rotate, so as to perform the winding operation.
  • the arrangement of the positioning holes 33 can also reduce the weight of the first conductive member 31 and/or the second conductive member 32 , thereby reducing the overall weight of the battery 100 . As shown in FIG.
  • each of the first conductive member 31 and the second conductive member 32 is provided with a positioning hole 33 .
  • the first conductive member 31 and the second conductive member 32 can also A plurality of positioning holes 33 are respectively provided.
  • the diaphragm 23 is also located between the first connection surface 311 and the second connection surface 321 .
  • the diaphragm 23 is used to electrically isolate the first conductive member 31 and the second conductive member 32, so there is no need to add additional insulating parts.
  • an insulating adhesive layer (not shown in the figure) may also be provided between the first connection surface 311 and the second connection surface 321. ).
  • the material of the insulating adhesive layer can include polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), polyimide (PI), nylon and Teflon (PTFE) at least one of.
  • the width W 1 of the first empty foil region 212 may be equal to the width W 2 of the first coating film region 211 .
  • the width W 3 of the second empty foil region 222 may also be equal to the width W 4 of the second coating film region 221 .
  • the widths W 1 and W 2 are the dimensions of the first empty foil area 212 or the second empty foil area 222 along the direction of the winding axis of the cell 20 . Therefore, the current collector does not need to be cut during the preparation of the pole piece, which simplifies the preparation process of the pole piece, and is beneficial to reduce the stress generated on the pole piece during the winding process.
  • the first conductive member 31 includes a first end portion 313 electrically connected to the first housing 11 and a second end portion 314 disposed opposite to the first end portion 313 .
  • the second conductive member 32 includes a third end portion 323 electrically connected to the second housing 12 and a fourth end portion 324 disposed opposite to the third end portion 323 .
  • the first end 313 protrudes from the fourth end 324, so that the first conductive member 31 is electrically connected to the first housing 11 through the first end 313; the third end The portion 323 protrudes from the second end portion 314 , so that the second conductive member 32 is electrically connected to the second housing 12 through the third end portion 323 .
  • the protruding height h 1 of the first end portion 313 relative to the fourth end portion 324 may be set to be less than 2 mm
  • the protruding height h 2 of the third end portion 323 relative to the second end portion 314 may be set to be less than 2 mm.
  • the battery 100 further includes a first fixing member 40 .
  • the first fixing member 40 is disposed between the first casing 11 and the battery cell 20 .
  • the first fixing member 40 is used to electrically isolate the fourth end portion 324 and the first casing 11 .
  • the first end portion 313 passes through the first fixing member 40 and is electrically connected to the first housing 11 .
  • the first fixing member 40 is made of insulating material, such as at least one of polypropylene, polyethylene terephthalate, polystyrene, polyimide, nylon and Teflon.
  • the first fixing member 40 is provided with a first opening 400 and a first groove (not shown), the first opening 400 penetrates the first fixing member 40 , and the first groove does not completely penetrate the first fixing member 40 .
  • the first end portion 313 passes through the first opening 400 and is electrically connected to the first housing 11 .
  • the fourth end portion 324 is inserted into the first groove so as to be fixed to the first fixing member 40 .
  • the battery 100 further includes a second fixing member 50 .
  • the second fixing member 50 is disposed between the second casing 12 and the battery cell 20 .
  • the second fixing member 50 is used to electrically isolate the second end portion 314 and the second casing 12 .
  • the third end portion 323 passes through the second fixing member 50 and is electrically connected to the second housing 12 .
  • the second fixing member 50 is made of insulating material, such as at least one of polypropylene (PP), polyethylene terephthalate, polystyrene, polyimide, nylon and Teflon.
  • the second fixing member 50 is provided with a second opening 500 and a second groove (not shown), the second opening 500 penetrates the second fixing member 50 , and the second groove does not completely penetrate the second fixing member 50 .
  • the third end portion 323 passes through the second opening 500 and is electrically connected to the second housing 12 .
  • the second end portion 314 is inserted into the second groove so as to be fixed to the second fixing member 50 .
  • the battery 100 further includes an insulating member 60 disposed around the outer periphery of the battery cell 20 .
  • the insulating member 60 is provided with an opening (not marked in the figure).
  • the insulating member 60 is used to prevent the battery cell 20 from being in direct contact with the casing 10 so as to avoid a short circuit.
  • the electrolyte can fully infiltrate the cell through the opening provided in the insulating member 60, that is, the penetration ability of the electrolyte to the pole pieces of the cell is improved, and the pole piece is guaranteed. It has a good contact interface with the electrolyte.
  • the first casing 11 is provided with an accommodating space for accommodating the battery cells 20 .
  • the second casing 12 is mounted on the first casing 11 to close the accommodating space. That is, the second housing 12 may be the top cover of the housing 10 .
  • the first casing 11 may include a casing body 110 and a cover body 111 welded on the casing body 110 .
  • the cover body 111 is provided with an opening, and the second casing 12 is used to close the opening of the cover body 111 .
  • the material of the first casing 11 and the second casing 12 may be metal.
  • the material of the first casing 11 and the second casing 12 may be steel alloy, aluminum alloy, iron alloy, copper alloy, nickel alloy, and the like.
  • the cover body 111 of the first casing 11 and the second casing 12 can be formed into desired shapes by laser cutting, machining and other processes.
  • the casing body 110 of the first casing 11 may be punched to form a punch hole (ie, an accommodating space).
  • the cover 111 of the first casing 11 and the second casing 12 are bonded by the adhesive layer 13 , and the adhesive layer 13 is used to electrically isolate the first casing 11 and the second casing 12 .
  • the first casing 11 and the second casing 12 may also be sealed by an insulating sealing ring (not shown).
  • the present application further provides an electronic device 200 , and the electronic device 200 includes the above-mentioned battery 100 .
  • the electronic device 200 of the present application may be, but is not limited to, a notebook computer, a pen input computer, a mobile computer, an e-book player, a portable phone, a portable fax machine, a portable copier, a portable printer, a headset stereo headphones, video recorders, LCD TVs, portable cleaners, portable CD players, mini discs, transceivers, electronic notepads, calculators, memory cards, portable recorders, radios, backup power, motors, cars, motorcycles, power Bicycles, bicycles, lighting fixtures, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries and lithium-ion capacitors, etc.

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Abstract

一种电池（100），包括外壳（10）和容置于外壳（10）内的电芯（20）。外壳（10）包括电性隔绝的第一壳体（11）和第二壳体（12）。第二壳体（12）安装于第一壳体（11）。电芯（20）包括第一极片（21）、第二极片（22）和位于第一极片（21）和第二极片（22）之间的隔膜（23）。电池（100）还包括容置于外壳（10）内且电性隔绝的第一导电件（31）和第二导电件（32），第一导电件（31）电连接第一极片（21）和第一壳体（11），第二导电件（32）电连接第二极片（22）和第二壳体（12）。第一导电件（31）和第二导电件（32）构成导电结构（30），第一极片（21）、隔膜（23）和第二极片（22）围绕导电结构（30）卷绕形成电芯（20）。第一极片（21）的起始端和第二极片（22）的起始端位于第一导电件（31）和第二导电（32）件之间。包括上述电池（100）的一种电子装置（200）。上述电池（100）可以提高电池（100）内部空间利用率和能量密度。

Description

电池和具有所述电池的电子装置 技术领域
本申请涉及储能技术领域，尤其涉及一种电池和具有所述电池的电子装置。
背景技术
随着消费电子类的产品如笔记本电脑、手机、掌上游戏机、平板电脑、移动电源和无人机等的普及，人们对电池的要求越来越严格。目前，电池结构主要分为卷绕式与叠片式。常见的卷绕式结构电池需要通过卷针将正极极片、负极极片和两层隔膜叠加为四层结构并进行卷绕。卷绕完成后，需将所述卷针抽取出来，得到电芯。
然而，在卷针抽针后会在电芯的卷绕起始端留出一个中空的空间，造成电池内部空间利用率低和能量密度损失。再者，正极极片和负极极片的尾部需要焊接极耳以实现电子的传导，而极耳还需要转接焊至金属片。
发明内容
有鉴于此，有必要提供一种能够提高电池内部空间利用率和能量密度的电池。
另外，还有必要提供一种具有如上电池的电子装置。
本申请提供一种电池，包括外壳和容置于外壳内的电芯。外壳包括电性隔绝的第一壳体和第二壳体。第二壳体安装于第一壳体。电芯包括第一极片、第二极片和位于第一极片和第二极片之间的隔膜。电池还包括容置于外壳内且电性隔绝的第一导电件和第二导电件，第一导电件电连接第一极片和第一壳体，第二导电件电连接第二极片和第二壳体。第一导电件和第二导电件构成导电结构，第一极片、隔膜和第二极片围绕导电结构卷绕形成电芯。第一极片的起始端和第二极片的起始端位于第一导电件和第二导电件之间。
在本申请一些实施方式中，第一极片和第二极片在第一导电件和第二导电件之间的间隙以大致相同的方向延伸。
在本申请一些实施方式中，第一极片包括第一集流体。第一集流体包括第一空箔区和第一涂膜区，第一空箔区未设置第一活性物质层，第一涂膜区设置有第一活性物质层。第一导电件电连接第一空箔区。第二极片包括第二集流体。第二集流体包括第二空箔区和第二涂膜区，第二空箔区未设置第二活性物质层，第二涂膜区设置有第二活性物质层。第二导电件电连接第二空箔区。
在本申请一些实施方式中，第一导电件包括第一连接面。第二导电件包括朝向第一连接面的第二连接面。第一连接面用于电连接第一空箔区。第二连接面用于电连接第二空箔区。
在本申请一些实施方式中，第一导电件还包括连接第一连接面的第一侧面。第二导电 件还包括连接第二连接面的第二侧面。第一侧面和第二侧面共同构成导电结构的外侧面。部分第一空箔区和部分第二空箔区围绕导电结构的外侧面。
在本申请一些实施方式中，围绕导电结构的外侧面的第一空箔区和围绕导电结构的外侧面的第二空箔区的表面积均小于或等于导电结构的外侧面的表面积。
在本申请一些实施方式中，隔膜还位于第一连接面和第二连接面之间。隔膜用于使第一导电件和第二导电件电性隔绝。
在本申请一些实施方式中，第一连接面和第二连接面之间设有绝缘胶层。绝缘胶层用于使第一导电件和第二导电件电性隔绝。
在本申请一些实施方式中，沿电芯的卷绕轴线的方向，第一空箔区的宽度等于第一涂膜区的宽度，和/或第二空箔区的宽度等于第二涂膜区的宽度。
在本申请一些实施方式中，第一导电件包括电连接第一壳体的第一端部和与第一端部相对设置的第二端部。第二导电件包括电连接第二壳体的第三端部和与第三端部相对设置的第四端部。沿电芯的卷绕轴线的方向，第一端部相较于第四端部伸出，第三端部相较于第二端部伸出。
在本申请一些实施方式中，第一端部相较于第四端部伸出的高度小于2mm，第三端部相较于第二端部伸出的高度小于2mm。
在本申请一些实施方式中，电池还包括第一固定件。第一固定件设置于第一壳体与电芯之间。第一固定件用于电性隔绝第四端部和第一壳体。第一端部穿过第一固定件并电连接第一壳体。
在本申请一些实施方式中，电池还包括第二固定件。第二固定件设置于第二壳体与电芯之间。第二固定件用于电性隔绝第二端部和第二壳体。第三端部穿过第二固定件并电连接第二壳体。
在本申请一些实施方式中，沿电芯的卷绕轴线的方向，第一导电件和第二导电件中的至少一者设有定位孔。
在本申请一些实施方式中，导电结构的横截面整体形状为规则的几何形状。
在本申请一些实施方式中，导电结构的横截面的整体形状为矩形、六边形、圆形或椭圆形。
本申请还提供一种电子装置，包括如上电池。
本申请设置导电结构，制备时可通过导电结构对第一极片、隔膜和第二极片进行卷绕。因此，导电结构可取代现有技术中的卷针，且卷绕形成电芯后导电结构无需抽取出来，因此导电结构可作为极耳将极片的电极性引出，且导电结构能够充分利用现有技术中卷针抽出后在电芯卷绕起始端留出的中空空间，不会额外占据电芯外圈与壳体之间的空间，提高电池内部空间利用率，从而提高电池能量密度；再者，由于第一极片的起始端和第二极片的起始端位于第一导电件和第二导电件之间，在围绕导电结构进行卷绕时，便于设置第一极片的活性物质层和第二极片的活性物质层充分对应，降低了极片的析锂风险，提高了电 池的安全性。
附图说明
图1为本申请一实施方式的电池的剖视图。
图2为图1所示的电池的分解图。
图3A为图1所示的电池的第一极片和第二极片围绕导电结构卷绕时的示意图。
图3B为图1所示的电池的第一极片和第二极片展开时的示意图。
图4为图3A所示的导电结构的示意图。
图5为图3A所示的导电结构于另一实施例中的示意图。
图6为图3A所示的导电结构于又一实施例中的示意图。
图7为图3A所示的导电结构于再一实施例中的示意图。
图8为图3A所示的导电结构于再一实施例中的示意图。
图9为图3A所示的导电结构于再一实施例中的示意图。
图10为图3A所示的导电结构于再一实施例中的示意图。
图11为图3B所示的第一极片另一角度的示意图。
图12为图3B所示的第二极片另一角度的示意图。
图13为本申请一实施方式的电子装置的结构示意图。
主要元件符号说明
外壳                10
第一壳体            11
第二壳体            12
胶粘层              13
电芯                20
第一极片            21
第二极片            22
隔膜                23
导电结构            30
第一导电件          31
第二导电件          32
定位孔              33
第一固定件          40
第二固定件          50
绝缘件              60
电池                100
壳体主体            110
盖体                111
电子装置            200
第一集流体          210
第一涂膜区          211
第一空箔区          212
第一活性物质层      213
第二集流体          220
第二涂膜区          221
第二活性物质层      223
外侧面              300
第一连接面          311
第一侧面            312
第一端部            313
第二端部            314
第二连接面          321
第二侧面            322
第三端部            323
第四端部            324
第一开口            400
第二开口            500
宽度                W 1、W 2、W 3、W 4
高度                h 1、h 2
如下具体实施方式将结合上述附图进一步说明本申请。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅为本申请一部分实施例，而不是全部的实施例。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的 实施方式的目的，不是旨在于限制本申请。
下面结合附图，对本申请的一些实施方式作详细说明。在不冲突的情况下，下述的实施方式及实施方式中的特征可以相互组合。
请参阅图1和图2，本申请一实施方式提供一种电池100。本申请的电池100可以是锂二次电池，包括锂金属二次电池、锂离子二次电池、锂聚合物二次电池和锂离子聚合物二次电池。在其它实施方式中，电池100也可以是所有种类的一次电池、二次电池、燃料电池或太阳能电池。
电池100包括外壳10和容置于外壳10内的电芯20。外壳10包括电性隔绝的第一壳体11和第二壳体12，第二壳体12安装于第一壳体11。电芯20包括第一极片21、第二极片22和位于第一极片21和第二极片22之间的隔膜23。隔膜23用于防止第一极片21和第二极片22直接接触，防止电芯20短路。
电池100还包括容置于外壳10内且电性隔绝的第一导电件31和第二导电件32。第一导电件31电连接第一极片21和第一壳体11，第二导电件32电连接第二极片22和第二壳体12。因此，第一极片21可经第一导电件31电连接至第一壳体11，使得第一壳体11与第一极片21呈现相同的电极性；第二极片22可经第二导电件32电连接至第二壳体12，使得第二壳体12与第二极片22呈现相同的电极性。从而，可实现极片与外壳10之间电连接，使得第一极片21和第二极片22的电极性可分别通过第一壳体11和第二壳体12引出。
第一导电件31和第二导电件32构成导电结构30，第一极片21、隔膜23和第二极片22围绕导电结构30卷绕形成电芯20。第一极片21的起始端和第二极片22的起始端均位于第一导电件31和第二导电件32之间。
本申请设置导电结构30，制备时可通过导电结构30对第一极片21、隔膜23和第二极片22进行卷绕。因此，导电结构30可取代现有技术中的卷针。卷绕形成电芯20后导电结构30无需抽取出来，因此导电结构30可作为极耳将极片的电极性引出，且导电结构30能够充分利用现有技术中卷针抽出后在电芯20卷绕起始端留出的中空空间。相较于现有技术中极片尾部焊接极耳并将极耳转接焊至金属片的工艺，本申请无需另外在极片尾部焊接极耳，也无需极耳胶保护和转接焊，避免现有技术中极耳占据电芯外圈与壳体之间的空间，提高电池100内部空间利用率，从而提高电池100能量密度。再者，由于第一极片21的起始端和第二极片22的起始端均位于第一导电件31和第二导电件32之间，在围绕导电结构30进行卷绕时，便于设置第一极片21的活性物质层和第二极片22的活性物质层充分对应，降低极片的析锂风险，提高电池100的安全性。
另一方面，由于卷绕形成电芯20后导电结构30无需抽取出来，能够避免现有技术中卷针抽出导致隔膜23被带出或错位的问题，进而避免第一极片21和第二极片22直接接触而导致的短路，进一步提高电池100的安全性。导电结构30还可以在外壳10中心发生 下陷变形时提供支撑作用，防止内部的第一极片21和第二极片22由于外壳10的作用发生变形，提高电池100的品质。
请一并参照图3A和图3B，在一实施方式中，第一极片21包括第一集流体210。第一集流体210包括第一空箔区212和第一涂膜区211。第一空箔区212未设置第一活性物质层213，第一涂膜区211设置有第一活性物质层213。第一导电件31电连接第一空箔区212。因此，第一极片21的电极性可经第一空箔区212导出至第一导电件31。第二极片22包括第二集流体220。第二集流体220包括第二空箔区222和连接第二空箔区222的第二涂膜区221，第二空箔区222未设置第二活性物质层223，第二涂膜区221设置有第二活性物质层223。第二导电件32电连接第二空箔区222。因此，第二极片22的电极性可经第二空箔区222导出至第二导电件32。如图3A所示，为降低析锂风险，第一活性物质层213和第二活性物质层223可完全对应。
其中，如图3A和图3B所示，第一导电件31包括第一连接面311。第二导电件32包括朝向第一连接面311的第二连接面321。第一极片21的起始端(即部分第一空箔区212)和第二极片22的起始端(即部分第二空箔区222)均位于第一连接面311和第二连接面321之间的间隙。第一连接面311用于电连接第一空箔区212，如，第一空箔区212可直接贴合于第一连接面311。第二连接面321用于电连接第二空箔区222，如，第二空箔区222可直接贴合于第二连接面321。
第一导电件31还包括连接第一连接面311的第一侧面312。第二导电件32还包括连接第二连接面321的第二侧面322。第一侧面312和第二侧面322共同构成导电结构30的外侧面300。除部分第一空箔区212和部分第二空箔区222位于第一连接面311和第二连接面321之间的间隙之外，另一部分第一空箔区212和另一部分第二空箔区222围绕导电结构30的外侧面300。围绕导电结构30的外侧面300的第一空箔区212和围绕导电结构30的外侧面300的第二空箔区222的表面积可均小于或等于导电结构30的外侧面300的表面积。
如图3A和3B所示，在一实施方式中，第一极片21和第二极片22在第一导电件31和第二导电件32之间的间隙中以相同的方向延伸。此处所述相同方向延伸应该理解为包含大致相同方向延伸的情况，因为实际场景中，第一极片21和第二极片22在第一导电件31和第二导电件32之间的间隙中的延伸方向可能不是完全相同，而是有一定偏差。进一步地，第一极片21和第二极片22可沿同一方向围绕导电结构30的外侧面300进行卷绕。从而，第一空箔区212和第二空箔区222的其中一者可位于电芯20的内圈，第一空箔区212和第二空箔区222的另一者可位于电芯20的第二圈。例如，当第一极片21和第二极片22沿顺时针方向围绕导电结构30的外侧面300进行卷绕时，第一空箔区212位于电芯20的内圈，第二空箔区222位于电芯20的第二圈。可以理解，当第一极片21和第二极片22沿逆时针方向围绕导电结构30的外侧面300进行卷绕时，第二空箔区222位于电芯20的内圈，第一空箔区212位于电芯20的第二圈。在本实施方式中，第一极片21和第二极 片22分别为正极极片和负极极片，第一极片21和第二极片22沿逆时针方向围绕导电结构30的外侧面300进行卷绕，使第二空箔区222位于电芯22的内圈(即负极极片位于内圈)。可以理解，在其它实施方式中，第一极片21和第二极片22还可以分别为负极极片和正极极片，本申请并不作限制。
其中，可以设置第一连接面311和第二连接面321形状匹配，即，第一连接面311和第二连接面321能够拼接在一起。例如，如图3A和图3B所示，第一连接面311和第二连接面321可为相互平行的平面。又如，如图4所示，第一连接面311和第二连接面321还可以分别为凸出和凹陷的曲面。又如，如图5所示，第一连接面311和第二连接面321还可以均为锯齿面，且两个锯齿面的凸峰和凹谷一一对应。如此，可以减小第一连接面311和第二连接面321之间的间隙，避免第一导电件31和第二导电件32之间的空间浪费，进一步提高电池100内部的空间利用率。
在一实施方式中，导电结构30的横截面整体形状为规则的几何形状。导电结构30的横截面整体形状可以根据电芯20所需的形状进行设置，即，围绕导电结构30卷绕形成电芯20后，电芯20可以呈现与导电结构30的横截面接近一致的形状。其中，如图3A至图5所示，导电结构30的横截面的整体形状可以为圆形。如图6至图8所示，在其它实施方式中，导电结构30的横截面的整体形状还可以为矩形、六边形或椭圆形。
请参阅图9，其中，沿电芯20的卷绕轴线的方向，第一导电件31和第二导电件32中的至少一者可设有定位孔33。第一导电件31和/或第二导电件32可通过定位孔33安装于卷绕机(图未示)。当卷绕机启动时，卷绕机可驱动第一导电件31或第二导电件32转动，从而进行卷绕作业。此外，定位孔33的设置还可以减小第一导电件31和/或第二导电件32的重量，从而减小电池100的整体重量。如图9所示，第一导电件31和第二导电件32中均设有一个定位孔33。请参阅图10，在另一实施方式中，为提高卷绕机与第一导电件31和第二导电件32之间的连接牢固性，第一导电件31和第二导电件32中还可以分别设置有多个定位孔33。
如图3A和图3B所示，在一实施方式中，隔膜23还位于第一连接面311和第二连接面321之间。隔膜23用于使第一导电件31和第二导电件32电性隔绝，因此无需添加额外的绝缘部件。当然，在另一实施方式中，为了使第一导电件31和第二导电件32电性隔绝，也可以在第一连接面311和第二连接面321之间设置绝缘胶层(图未示)。绝缘胶层的材质可包括聚丙烯(PP)、聚对苯二甲酸乙二醇酯(PET)、聚苯乙烯(PS)、聚酰亚胺(PI)、尼龙和铁氟龙(PTFE)中的至少一种。
如图11和图12所示，在一实施方式中，沿电芯20的卷绕轴线的方向，第一空箔区212的宽度W 1可等于第一涂膜区211的宽度W 2。第二空箔区222的宽度W 3也可等于第二涂膜区221的宽度W 4。其中，所述宽度W 1、W 2为沿电芯20卷绕轴线的方向上第一空箔区212或第二空箔区222的尺寸。因此，极片制备时不需要对集流体进行裁剪，简化极片的制备工艺，而且有利于减小卷绕过程中极片上产生的应力。
如图1所示，在一实施方式中，第一导电件31包括电连接第一壳体11的第一端部313和与第一端部313相对设置的第二端部314。第二导电件32包括电连接第二壳体12的第三端部323和与第三端部323相对设置的第四端部324。沿电芯20的卷绕轴线的方向，第一端部313相较于第四端部324伸出，便于第一导电件31通过第一端部313电连接第一壳体11；第三端部323相较于第二端部314伸出，便于第二导电件32通过第三端部323电连接第二壳体12。进一步地，可设置第一端部313相较于第四端部324伸出的高度h 1小于2mm，第三端部323相较于第二端部314伸出的高度h 2小于2mm。
如图1和图2所示，电池100还包括第一固定件40。第一固定件40设置于第一壳体11与电芯20之间。第一固定件40用于电性隔绝第四端部324和第一壳体11。而且，第一端部313穿过第一固定件40并电连接第一壳体11。其中，第一固定件40采用绝缘材料制成，如聚丙烯、聚对苯二甲酸乙二醇酯、聚苯乙烯、聚酰亚胺、尼龙和铁氟龙中的至少一种。其中，第一固定件40设有第一开口400和第一凹槽(图未示)，第一开口400贯穿第一固定件40，第一凹槽未完全贯穿第一固定件40。第一端部313穿过第一开口400并电连接第一壳体11。第四端部324插入第一凹槽中，从而固定于第一固定件40。
进一步地，电池100还包括第二固定件50。第二固定件50设置于第二壳体12与电芯20之间。第二固定件50用于电性隔绝第二端部314和第二壳体12。而且，第三端部323穿过第二固定件50并电连接第二壳体12。其中，第二固定件50采用绝缘材料制成，如聚丙烯(PP)、聚对苯二甲酸乙二醇酯、聚苯乙烯、聚酰亚胺、尼龙和铁氟龙中的至少一种。其中，第二固定件50设有第二开口500和第二凹槽(图未示)，第二开口500贯穿第二固定件50，第二凹槽未完全贯穿第二固定件50。第三端部323穿过第二开口500并电连接第二壳体12。第二端部314插入第二凹槽中，从而固定于第二固定件50。
如图1所示，在一实施方式中，电池100还包括围绕电芯20外周设置的绝缘件60。绝缘件60中开设有开孔(图未标)。绝缘件60用于防止电芯20与外壳10直接接触，从而避免短路。再者，当向外壳10中注入电解液时，电解液能够通过绝缘件60中设有的开孔充分浸润电芯，即提高所述电解液对电芯的极片的渗透能力，保证极片和电解液之间具有良好的接触界面。
如图2所示，在本实施方式中，第一壳体11设有用于收容电芯20的容置空间。第二壳体12安装于第一壳体11以封闭容置空间。即，第二壳体12可以为外壳10的顶盖。更具体地，第一壳体11可包括壳体主体110和焊接于壳体主体110上的盖体111。盖体111上设有开口，第二壳体12用于封闭盖体111的开口。第一壳体11和第二壳体12的材质可以为金属。如，第一壳体11和第二壳体12的材质可以为钢合金、铝合金、铁合金、铜合金、镍合金等。制备时，第一壳体11的盖体111和第二壳体12可以采用激光切割、机床加工等工艺形成所需的形状。第一壳体11的壳体主体110可以采用冲压成型形成冲坑(即，容置空间)。第一壳体11的盖体111和第二壳体12通过胶粘层13粘接，且胶粘层13用于使第一壳体11和第二壳体12之间电性隔绝。在另一实施方式中，第一壳体11和第 二壳体12之间还可以通过绝缘的密封圈(图未示)进行密封。
请参阅图13，本申请还提供一种电子装置200，电子装置200包括如上的电池100。在一实施方式中，本申请的电子装置200可以是，但不限于，笔记本电脑、笔输入型计算机、移动电脑、电子书播放器、便携式电话、便携式传真机、便携式复印机、便携式打印机、头戴式立体声耳机、录像机、液晶电视、手提式清洁器、便携CD机、迷你光盘、收发机、电子记事本、计算器、存储卡、便携式录音机、收音机、备用电源、电机、汽车、摩托车、助力自行车、自行车、照明器具、玩具、游戏机、钟表、电动工具、闪光灯、照相机、家庭用大型蓄电池和锂离子电容器等。
以上仅为本申请的较佳实施例而已，并不用以限制本申请，凡在本申请的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本申请的保护范围之内。

Claims (17)

  1. 一种电池，包括外壳和容置于所述外壳内的电芯，所述外壳包括电性隔绝的第一壳体和第二壳体，所述第二壳体安装于所述第一壳体，所述电芯包括第一极片、第二极片和位于所述第一极片和所述第二极片之间的隔膜，其特征在于，
    所述电池还包括容置于所述外壳内且电性隔绝的第一导电件和第二导电件，所述第一导电件电连接所述第一极片和所述第一壳体，所述第二导电件电连接所述第二极片和所述第二壳体；
    所述第一导电件和所述第二导电件构成导电结构，所述第一极片、所述隔膜和所述第二极片围绕所述导电结构卷绕形成所述电芯，所述第一极片的起始端和所述第二极片的起始端位于所述第一导电件和所述第二导电件之间。
  2. 如权利要求1所述的电池，其特征在于，所述第一极片和所述第二极片在所述第一导电件和所述第二导电件之间的间隙以大致相同的方向延伸。
  3. 如权利要求1所述的电池，其特征在于，所述第一极片包括第一集流体，所述第一集流体包括第一空箔区和第一涂膜区，所述第一空箔区未设置第一活性物质层，所述第一涂膜区设置有所述第一活性物质层，所述第一导电件电连接所述第一空箔区；
    所述第二极片包括第二集流体，所述第二集流体包括第二空箔区和第二涂膜区，所述第二空箔区未设置第二活性物质层，所述第二涂膜区设置有所述第二活性物质层，所述第二导电件电连接所述第二空箔区。
  4. 如权利要求3所述的电池，其特征在于，所述第一导电件包括第一连接面，所述第二导电件包括朝向所述第一连接面的第二连接面，所述第一连接面用于电连接所述第一空箔区，所述第二连接面用于电连接所述第二空箔区。
  5. 如权利要求3所述的电池，其特征在于，所述第一导电件还包括连接所述第一连接面的第一侧面，所述第二导电件还包括连接所述第二连接面的第二侧面，所述第一侧面和所述第二侧面共同构成所述导电结构的外侧面，部分所述第一空箔区和部分所述第二空箔区围绕所述导电结构的外侧面。
  6. 如权利要求5所述的电池，其特征在于，围绕所述导电结构的外侧面的所述第一空箔区和围绕所述导电结构的外侧面的所述第二空箔区的表面积均小于或等于所述导电结构的外侧面的表面积。
  7. 如权利要求4所述的电池，其特征在于，所述隔膜还位于所述第一连接面和所述第二连接面之间，所述隔膜用于使所述第一导电件和所述第二导电件电性隔绝。
  8. 如权利要求4所述的电池，其特征在于，所述第一连接面和所述第二连接面之间设有绝缘胶层，所述绝缘胶层用于使所述第一导电件和所述第二导电件电性隔绝。
  9. 如权利要求3所述的电池，其特征在于，沿所述电芯的卷绕轴线的方向，所述第一空箔区的宽度等于所述第一涂膜区的宽度，和/或所述第二空箔区的宽度等于所述第二涂 膜区的宽度。
  10. 如权利要求1所述的电池，其特征在于，所述第一导电件包括电连接所述第一壳体的第一端部和与所述第一端部相对设置的第二端部，所述第二导电件包括电连接所述第二壳体的第三端部和与所述第三端部相对设置的第四端部，沿所述电芯的卷绕轴线的方向，所述第一端部相较于所述第四端部伸出，所述第三端部相较于所述第二端部伸出。
  11. 如权利要求10所述的电池，其特征在于，所述第一端部相较于所述第四端部伸出的高度小于2mm，所述第三端部相较于所述第二端部伸出的高度小于2mm。
  12. 如权利要求10所述的电池，其特征在于，所述电池还包括第一固定件，所述第一固定件设置于所述第一壳体与所述电芯之间，所述第一固定件用于电性隔绝所述第四端部和所述第一壳体，所述第一端部穿过所述第一固定件并电连接所述第一壳体。
  13. 如权利要求12所述的电池，其特征在于，所述电池还包括第二固定件，所述第二固定件设置于所述第二壳体与所述电芯之间，所述第二固定件用于电性隔绝所述第二端部和所述第二壳体，所述第三端部穿过所述第二固定件并电连接所述第二壳体。
  14. 如权利要求1所述的电池，其特征在于，沿所述电芯的卷绕轴线的方向，所述第一导电件和所述第二导电件中的至少一者设有定位孔。
  15. 如权利要求1所述的电池，其特征在于，所述导电结构的横截面整体形状为规则的几何形状。
  16. 如权利要求15所述的电池，其特征在于，所述导电结构的横截面的整体形状为矩形、六边形、圆形或椭圆形。
  17. 一种电子装置，其特征在于，所述电子装置包括如权利要求1至16中任一项所述的电池。
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