WO2019179232A1 - 单体电池、电池模组、动力电池和电动汽车 - Google Patents

单体电池、电池模组、动力电池和电动汽车 Download PDF

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Publication number
WO2019179232A1
WO2019179232A1 PCT/CN2019/072662 CN2019072662W WO2019179232A1 WO 2019179232 A1 WO2019179232 A1 WO 2019179232A1 CN 2019072662 W CN2019072662 W CN 2019072662W WO 2019179232 A1 WO2019179232 A1 WO 2019179232A1
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WO
WIPO (PCT)
Prior art keywords
plate
unit cell
cell according
segment
bottom plate
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/CN2019/072662
Other languages
English (en)
French (fr)
Inventor
王信月
程晗
杨珂利
蒋露霞
彭凌一
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.)
BYD Co Ltd
Original Assignee
BYD Co 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 BYD Co Ltd filed Critical BYD Co Ltd
Priority to US17/040,409 priority Critical patent/US20210066700A1/en
Priority to JP2020551373A priority patent/JP7090172B2/ja
Priority to KR1020207030482A priority patent/KR20200135847A/ko
Priority to EP19772632.6A priority patent/EP3770995A4/en
Publication of WO2019179232A1 publication Critical patent/WO2019179232A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H01M50/528—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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H01M50/529—Intercell connections through partitions, e.g. in a battery casing
    • 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
    • H01M10/36—Accumulators not provided for in groups H01M10/05-H01M10/34
    • H01M10/38—Construction or manufacture
    • 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
    • H01M50/147—Lids or covers
    • 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
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • 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
    • H01M50/147—Lids or covers
    • H01M50/155—Lids or covers characterised by the material
    • 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/477—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their shape
    • 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
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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 disclosure relates to the field of vehicle manufacturing technology, and relates to a single battery, a battery module including the battery, a power battery provided with the battery module, and an electric vehicle provided with the power battery.
  • the power battery has at least two conductive terminals, and one end of the double-layer connecting piece is connected to the conductive terminal, and the other end is clamped to the pole to be connected with the pole core, thereby turning on the circuit.
  • the tabs sandwiching the tabs drive the tabs to bend, and the side spacers on both sides of the cover plate serve to fix the tabs and the insulation, but occupy the thickness of at least four layers in the height direction. It is not conducive to the improvement of cell space utilization.
  • the double-layer connecting piece only clamps the end portion of the tab, and does not effectively shape the other portions of the tab, especially the bent portion.
  • the tip of the double-layer connecting piece is attached to the tab.
  • the ear When the unit cell is subjected to extreme conditions such as collision or vibration, the ear may be cut. In severe cases, the internal resistance of the unit may increase, and heat is generated. Abnormal, there is a risk of causing a safety accident, there is room for improvement.
  • the present disclosure is intended to address at least one of the technical problems existing in the prior art. To this end, the present disclosure proposes a single cell in which the inner spacer has good support, insulation and shaping effect on the tab, and is not easy to cut the tab.
  • a unit cell includes: a case; a cover plate at an end of the case; a pole core, the pole core is located in the case, and the pole core has a pole
  • An inner spacer the inner spacer includes a bottom plate, a connecting plate and a supporting plate, wherein the bottom plate is disposed on a surface of the pole core facing the cover plate, and one end of the connecting plate and one of the bottom plate
  • the side edges are connected and formed in a bent shape with one side edge of the bottom plate, and the other end of the connecting plate is connected to the support plate and formed in a bent shape with the support plate, the support plate facing away from the bottom plate a direction extending from a side of the support plate toward a side surface of the pole core to a surface facing away from the side of the pole core; a conductive terminal, the conductive terminal being disposed And a conductive terminal is electrically connected to a surface of the tab facing away from the support plate.
  • an inner spacer is disposed between the pole core and the conductive terminal, and the inner spacer can simultaneously support the tab, the insulation, and the shaping ear to avoid short circuit between the tab and the pole core.
  • the ear is directly connected to the conductive terminal, and the contact between the tab and the conductive terminal is not connected through the connecting piece, thereby reducing the space occupation of the height direction of the single battery, improving the space utilization of the single battery, and enhancing the practicability of the single battery.
  • the present disclosure also provides a battery module comprising a connecting piece and the unit cells described in any of the above embodiments, wherein the unit cells are connected in series or in parallel through a connecting piece.
  • the present disclosure also provides a power battery including a package body and a battery module disposed in the package body.
  • the battery module is the battery module described in the above embodiment.
  • the present disclosure further proposes an electric vehicle provided with the power battery described in the above embodiments.
  • the battery module, the power battery, the electric vehicle and the above-mentioned single battery have the same advantages as those of the prior art, and are not described herein again.
  • 1 to 2 are schematic structural views of a unit cell according to an embodiment of the present disclosure
  • FIG. 3 is a schematic structural view of an inner spacer of a unit battery according to an embodiment of the present disclosure
  • FIG. 4 is a schematic structural view of an inner spacer of a unit cell stuck to an insulating plate according to an embodiment of the present disclosure
  • Figure 5 is a partial enlarged view of A in Figure 4.
  • connection In the description of the present disclosure, it should be noted that the terms “installation”, “connected”, and “connected” are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined. Connected, or integrally connected; may be a mechanical connection; may be directly connected, or may be indirectly connected through an intermediate medium, and may be internal communication between the two elements.
  • Connected, or integrally connected may be a mechanical connection; may be directly connected, or may be indirectly connected through an intermediate medium, and may be internal communication between the two elements.
  • a unit cell 100 according to an embodiment of the present disclosure will be described below with reference to FIGS.
  • a unit cell 100 includes a housing 40, a cover 50, a pole core 20, and an inner spacer 10.
  • the cover 50 is located at the end of the housing 40, the pole core 20 is disposed inside the unit cell 100, the pole core 20 is located in the housing 40, the pole core 20 has the tab 21, and the pole core 20 passes through the tab 21
  • the conductive terminals 70 of the unit cell 100 are connected.
  • the tabs 21 are soldered to the conductive terminals 70 of the unit cell 100 to realize the drainage of the pole core 20 and the cover 50 assembly, and the components of the pole core 20 and the cover 50 are ensured to be normal.
  • the current is turned on.
  • the inner spacer 10 can be used to space the conductive terminal 70 of the unit cell 100 from the pole core 20 to effectively insulate the conductive terminal 70 from the pole core 20, as shown in FIG.
  • the spacer 10 includes a bottom plate 11, a connecting plate 12 and a supporting plate 13.
  • the bottom plate 11 is supported on the pole core 20.
  • the bottom plate 11 is disposed on the surface of the pole core 20 facing the cover 50, and one end of the connecting plate 12 is connected to the edge of the bottom plate 11, and One end of the connecting plate 12 and one side edge of the bottom plate 11 are formed in a bent shape, that is, the extending direction of the connecting plate 12 is different from the extending direction of the bottom plate 11.
  • the bottom plate 11 extends in the horizontal direction
  • the connecting plate 12 faces the unit battery 100.
  • the height direction extends.
  • the support plate 13 is connected to the other end of the connecting plate 12, and the other ends of the supporting plate 13 and the connecting plate 12 are formed in a bent shape, that is, the supporting plate 13 and the bottom plate 11 are connected by the connecting plate 12.
  • the support plate 13 extends in a direction away from the bottom plate 11, and the support plate 13 and the bottom plate 11 form a certain height difference. It can be understood that the height difference between the support plate 13 and the bottom plate 11 can facilitate the pole 21 from the pole core 20.
  • the upper surface extends, the tab 21 extends to the lower surface of the support plate 13 and then extends along the lower surface of the support plate 13 in a direction away from the bottom plate 11, such that the support plate 13, the connecting plate 12, and the bottom plate 11 are sequentially connected.
  • a portion of the tab 21 extends from a side surface of the support plate 13 toward the side of the pole core 20 to a surface facing away from the side of the pole core 20, in one embodiment, the tab 21 is along the lower side of the support plate 13.
  • the surface extends in a direction away from the bottom plate 11, and the tabs 21 extend around the end of the support plate 13 to the upper surface of the support plate 13, thereby enabling effective shaping of the tabs 21, particularly at the bends.
  • both ends of the bottom plate 11 are provided with a connecting plate 12 and a supporting plate 13, that is, the inner spacer 10 includes two connecting plates 12, two supporting plates 13, and a bottom plate 11, so that The inner spacer 10 can be fitted and fitted with the two tabs 21 at the same time to support and insulate the tabs 21 of the pole core 20, and ensure normal current conduction between the tabs 21 and the conductive terminals 70.
  • the conductive terminal 70 is disposed on the cover 50, and the conductive terminal 70 is electrically connected to the surface of the tab 21 on the side away from the support plate 13, that is, the tab 21 is bent and supported. After the board 13 is extended, the upper surface of the tab 21 is attached to the conductive terminal 70 and connected by soldering, so that the tab 21 and the conductive terminal 70 have a large contact area, thereby effectively enhancing the overcurrent capability of the tab 21 and the conductive terminal 70.
  • the utility model improves the practical performance of the unit cell 100, wherein the conductive terminal 70 and the cover 50 are insulated and sealed, so that no current is conducted between the conductive terminal 70 and the cover 50.
  • the tab 21 of the pole core 20 can be directly welded to the conductive terminal 70, and the inner spacer 10 supports the tab 21 under the tab 21, And the pole 21 and the pole core 20 are spaced apart in height to achieve effective insulation, and the tab 21 is bent along the outer side of the inner spacer 10, so that the tab 21 is directly soldered to the conductive terminal without passing through the connecting piece.
  • the space occupation in the height direction is reduced, and the space utilization rate of the unit battery 100 is effectively improved.
  • an inner spacer 10 is disposed between the pole core 20 and the conductive terminal 70, and the inner spacer 10 can simultaneously serve as the supporting tab 21, the insulating and shaping the lug 21, and avoid
  • the tab 21 is short-circuited with the pole core 20, and the tab 21 is directly connected to the conductive terminal 70.
  • the tab 21 and the conductive terminal 70 are not connected through the connecting piece, thereby reducing the space occupation of the cell 100 in the height direction and improving the single cell.
  • the space utilization of 100 enhances the practicability of the unit cell 100.
  • the unit cell 100 further includes a transition piece 30 having a through hole, the conductive terminal 70 sequentially passing through the cover plate 50, the through hole, and the conductive terminal 70 is welded to the transition piece 30.
  • the side surface of the transition piece 30 facing away from the cover plate 50 is welded to the side surface of the tab away from the support plate 13, so that the conductive terminal 70 is connected to the tab 21 through the transition piece 30, The current between the conductive terminal 70 of the unit cell 100 and the pole core 20 is conducted.
  • the unit cell 100 of the present disclosure further includes an insulating plate 60 between the cover plate 50 and the transition piece 30, and the insulating plate 60 has a fixing hole.
  • the conductive terminal 70 passes through the fixing hole to fix the insulating plate 60.
  • the conductive terminal 70 sequentially passes through the cover 50, the fixing hole of the insulating plate 60, the through hole of the transition piece 30, and is connected to the tab 21 while making the conductive terminal 70.
  • the insulating plate 60, the transition piece 30 and the tabs 21 are relatively fixed to ensure the integrity of the overall structure of the unit cell 100.
  • the inner spacer 10 and the insulating plate 60 are fixedly connected by snapping.
  • the end of the inner spacer 10 is provided with a positioning slot 161
  • the insulating plate 60 has The buckle 61 cooperates with the positioning slot 161 to fix the insulating plate 60 and the inner spacer 10.
  • the inner spacer 10 further includes a locking plate 16 , and the clamping plate 16 is disposed on one side of the bottom plate 11 .
  • the latching plate 16 is disposed at two ends of the bottom plate 11 in the longitudinal direction, and the latching plate 16 extends along the width direction of the bottom plate 11, and the latching plate 16 and the supporting plate 13 are located adjacent to the bottom plate 11.
  • the support plate 13 is located at both ends of the bottom plate 11 in the width direction, and the support plate 13 extends along the length direction of the bottom plate 11, so that the snap plate 16 and the support plate 13 are spaced apart along the circumferential direction of the bottom plate 11.
  • the positioning card slot 161 is disposed at an end of the latching plate 16 away from the bottom plate 11 , and the positioning card slot 161 is located at a surface of the latching plate 16 facing the pole core 20 , and the positioning card slot 161 is positioned with the card slot 161 , that is, the positioning card slot.
  • the 161 is located on the surface of the latching plate 16 facing away from the insulating plate 60.
  • the end of the latching plate 16 is provided with a escaping groove 15, which needs to be explained.
  • the insulating plate 60 is located on the surface of the latching plate 16 away from the pole core 20, whereby the latch 61 passes from the side of the latching plate 16 away from the pole core 20 through the escape slot 15 and extends to the latching plate 16
  • One side of the pole core 20 is configured to facilitate the snapping of the buckle 61 into the positioning slot 161 of the latching plate 16, so that the insulating plate 60 and the inner spacer 10 are stably connected and fixed.
  • the buckle 61 includes a connecting post 611 and a latching portion 612.
  • One end of the connecting post 611 is connected to the insulating plate 60, that is, the connecting post 611 is away from the end of the pole core and insulated.
  • the card 60 is fixedly connected, and the latching portion 612 is connected to the other end of the connecting post 611.
  • the latching portion 612 is connected to one end of the connecting post 611 close to the pole core, and the latching portion 612 is facing away from the supporting plate 13 of the supporting plate 13
  • the end surface of the engaging portion 161 is pressed against the end surface of the supporting plate 13 of the engaging plate 16 , and the end surface of the supporting portion 612 facing away from the supporting plate 13 of the engaging plate 16 is provided with a guiding surface 6121 , and the guiding surface 6121
  • the support plate 13 can be easily engaged with the buckle 61.
  • the insulating plate 60 is provided with two sets of latches 61 which are oppositely disposed.
  • the supporting plate 13 is provided with two sets of positioning slots 161 which are oppositely disposed, and the two sets of the latching portions 612 of the two sets of the latches 61
  • the spacing between the two ends of the supporting plate 13 is smaller than the spacing between the two sets of connecting posts 611 of the two sets of latches 61.
  • the two sets of the engaging portions 612 are provided with opposite guiding faces 6121. In this way, the end of the support plate 13 is pressed along the guiding surface 6121 of the engaging portion 612, the connecting post 611 is subjected to the pressure from the guiding surface 6121, and the inner spacer is caught between the two sets of connecting posts 611.
  • the engaging portion 612 can prevent the inner spacer from being detached from the buckle 61, thereby improving the stability of the overall structure of the unit battery.
  • the bottom plate 11 and the support plate 13 are both disposed in a direction parallel to the cover plate 50, for example, the bottom plate 11 and the pole core 20 of the unit cell 100.
  • the support plate 13 is connected to the bottom plate 11 through the connecting plate 12, the support plate 13 is formed to extend in a direction parallel to the bottom plate 11, and there is a height difference between the bottom plate 11 and the support plate 13, and the bottom plate 11 and the pole core 20 Parallel, there is a difference in spacing between the support plate 13 and the pole core 20.
  • the connecting plate 12 is perpendicular to the support plate 13 and the bottom plate 11, and the tabs 21 are spaced apart from the bottom plate 11 and the connecting plate 12, ie A space is defined between the connecting plate 12, the supporting plate 13, and the pole core 20, so that the defined space can facilitate the protrusion and bending of the tabs 21 from the pole core 20, and enhance the components of the unit cell 100.
  • a space is defined between the connecting plate 12, the supporting plate 13, and the pole core 20, so that the defined space can facilitate the protrusion and bending of the tabs 21 from the pole core 20, and enhance the components of the unit cell 100.
  • the connecting plate 12 is a ring around the bottom plate 11
  • the snap plate 16 is connected to the connecting plate 12
  • the clamping plate 16 is disposed coplanar with the supporting plate 13 .
  • the inner spacer 10 is along The longitudinal direction includes a latching plate 16 , a connecting plate 12 , a bottom plate 11 , a connecting plate 12 , and a latching plate 16 .
  • the inner spacer 10 includes a supporting plate 13 , a connecting plate 12 , and a bottom plate 11 .
  • the connecting plate 12 and the supporting plate 13 are arranged.
  • the outer side of the bottom plate 11 is provided with a connecting plate 12 extending in the circumferential direction.
  • the outer side of the connecting plate 12 is provided with a supporting plate 13 and a locking plate 16 extending in the circumferential direction.
  • the bottom plate 11, the connecting plate 12, the supporting plate 13, and the engaging plate 16 are integrally formed, which is beneficial to improving the integrity of the inner spacer 10, enhancing the structural strength of the inner spacer 10, and facilitating installation.
  • the inner spacer 10 further includes a head portion 14 having a circular arc shape, and the head portion 14 is connected to an end of the support plate 13 facing away from the connecting plate 12, And at least a portion of the head portion 14 is curved, and the thickness of the head portion 14 is greater than the thickness of the support plate 13, such that the tabs 21 extend along the lower surface of the support plate 13 toward the head portion 14 in a direction away from the bottom plate 11, and The ear 21 bypasses the head 14 and extends to the upper surface of the support plate 13.
  • the bending curvature of the tab 21 at the bypass head 14 is small, that is, the bending stress of the tab 21 is small, and the tab 21 is not easily bent.
  • the profile of the head 14 includes a first segment 141, a second segment 142, and a third segment 143 that are sequentially connected, the first segment 141 facing away from the end of the second segment 142 and
  • the support plate 13 is connected to the surface of the pole core 20, and one end of the third segment 143 facing away from the second segment 142 is connected to the surface of the support plate 13 facing away from the pole core 20, that is, the first segment 141, the second segment 142, and the third segment 143 are
  • the lower surface of the support plate 13 extends to the upper surface of the support plate 13, such that the tabs 21 extend along the lower surface of the support plate 13 to the first segment 141, and then extend along the outer surface of the first segment 141 and sequentially bypass
  • the second section 142 and the third section 143 are configured such that the tabs 21 are bent and extended to the upper surface of the support plate 13 and are then welded to the conductive terminals 70.
  • the first segment 141 is curved, and when the tab 21 extends along the outer side of the first segment 141, the curved first segment 141 does not cut the tab 21, and it should be noted that the tab is 21 is a multi-layered metal foil, and the hardness of the tab 21 is low.
  • the tab 21 When the tab 21 is wound around the head 14 of the inner spacer 10, the tab 21 can be in surface contact with the head 14 of the inner spacer 10, thus When the body battery 100 is in an extreme condition such as a collision or vibration condition, the tab 21 is not cut by the inner spacer 10, effectively extending the service life of the tab 21, thereby improving the performance of the unit cell 100.
  • the second section 142 is linear, that is, when the tab 21 is bypassing the head 14 of the inner spacer 10, the tab 21 extends at least partially in a straight line, and the second section 142 reaches the pole core 20
  • the distance is greater than the distance from the support plate 13 to the pole core 20, that is, the upper surface of the second segment 142 is higher than the upper surface of the support plate 13, in other words, the thickness of the head portion 14 of the inner spacer 10 is greater than the thickness of the support plate 13, such that When the tab 21 bypasses the head 14 of the inner spacer 10, the arc of the tab 21 is bent, that is, the curvature of the tab 21 is small, and when the tab 21 is bent, the inner side and the pole of the tab 21 are The stress on the outside of the ear 21 is small, so that the tab 21 is not easily broken when bent, the safety performance of the tab 21 is obviously improved, the service life of the tab 21 is prolonged, and the long-term use is facilitated.
  • the third segment 143 is curved, the radius of curvature of the first segment 141 is smaller than the radius of curvature of the third segment 143, and when the tab 21 is bypassing the third segment 143, the tab 21 may not be the third segment.
  • the tab 21 is completely conformed such that after the tab 21 bypasses the second segment 142, the tab 21 extends to a lower surface of the support plate 13 at a radius of curvature smaller than the third segment 143, that is, the lower surface of the tab 21 and the third segment 143 There is a small gap between the two, and the gap can absorb part of the vibration energy when the unit cell 100 is in an extreme condition such as a collision or vibration condition, thereby reducing the damage caused by the external environment to the unit cell 100, and also improving the unit cell 100.
  • the rationality of the overall structural design is completely conformed such that after the tab 21 bypasses the second segment 142, the tab 21 extends to a lower surface of the support plate 13 at a radius of curvature smaller than the third segment 143, that is, the lower surface of the tab 21 and the third segment 143.
  • the third segment 143 includes two arc segments, and the centers of curvature of the two segments of the third segment 143 are respectively located on opposite sides of the third segment 143, for example, the third segment 143.
  • An arcuate center of curvature connected to the support plate 13 is located on a side of the third segment 143 facing away from the pole core 20, and an arcuate center of curvature of the third segment 143 and the second segment 142 is located at the third segment 143 near the core.
  • the third segment 143 forms a smooth arc transition between the support plate 13 and the second segment 142, and also avoids cutting the tab 21 when the third segment 143 is in contact with the tab 21, thereby improving
  • the overall structure of the unit cell 100 is reasonable, and the safety of the use of the tab 21 is enhanced.
  • the shape of the head portion 14 of the inner spacer 10 is not limited thereto, and the head portion 14 of the inner spacer 10 may have an elliptical shape, a drop shape, or the like, and the damage to the tab 21 can be reduced.
  • a portion of the tab 21 is located above the bottom plate 11, that is, the tab 21 extends along the upper surface of the support plate 13 to the end of the support plate 13 away from the head 14, and then continues. Therefore, the length of the connection between the tab 21 and the conductive terminal 70 is relatively large, that is, the contact area between the tab 21 and the conductive terminal 70 is large, which can effectively enhance the overcurrent capability between the tab 21 and the conductive terminal 70, thereby improving
  • the utility of the unit cell 100 is such that a portion of the tab 21 is spaced apart from the bottom plate 11 such that a portion of the tab 21 is in good contact with the conductive terminal 70.
  • the present disclosure further provides a battery module provided with the single cells of any of the above embodiments, wherein the battery cells are formed in series or in parallel by the single cell connecting sheets.
  • the present disclosure also proposes a power battery.
  • the battery module of the above embodiment is provided.
  • the present disclosure further proposes an electric vehicle.
  • the power battery of the above embodiment is provided.
  • the inner spacer 10 is disposed between the pole core 20 and the conductive terminal 70, and the inner spacer 10 can simultaneously To the support tab 21, the insulating and shaping the ear 21, the short circuit between the tab 21 and the pole core 20 is avoided, and the tab 21 is directly connected to the conductive terminal 70.
  • the tab 21 and the conductive terminal 70 are not connected through the connecting piece.
  • the space occupation of the height direction of the unit cell 100 can be reduced, and the performance of the whole vehicle can be obviously improved.
  • a unit cell includes: a case; a cover plate at an end of the case; a pole core, the pole core is located in the case, and the pole core has a pole
  • An inner spacer the inner spacer includes a bottom plate, a connecting plate and a supporting plate, wherein the bottom plate is disposed on a surface of the pole core facing the cover plate, and one end of the connecting plate and one of the bottom plate
  • the side edges are connected and formed in a bent shape with one side edge of the bottom plate, and the other end of the connecting plate is connected to the support plate and formed in a bent shape with the support plate, the support plate facing away from the bottom plate a direction extending from a side of the support plate toward a side surface of the pole core to a surface facing away from the side of the pole core; a conductive terminal, the conductive terminal being disposed And a conductive terminal is electrically connected to a surface of the tab facing away from the support plate.
  • a unit cell according to an embodiment of the present disclosure further comprising a transition piece having a through hole thereon, the conductive terminal sequentially passing through the cover plate, the through hole, and being welded to the transition piece, the transition A side surface of the sheet facing away from the cover plate is welded to a side surface of the tab that faces away from the support plate.
  • a unit cell according to an embodiment of the present disclosure further comprising an insulating plate between the cover plate and the transition piece, the insulating plate having a fixing hole through which the conductive terminal passes A hole to fix the insulating plate.
  • the inner spacer forms a fixed connection with the insulating plate by snapping.
  • the end of the inner spacer is provided with a positioning card slot
  • the insulating plate has a buckle that cooperates with the positioning card slot
  • the inner spacer further includes: a snap plate, the snap plate is disposed at one side edge of the bottom plate, and the snap plate and the support plate are located at the An adjacent side of the bottom plate, the positioning card slot is disposed at an end of the clamping plate facing away from the bottom plate, and is located at a surface of the clamping plate facing the pole core.
  • the end portion of the snap-in board is provided with a escape groove for avoiding the buckle.
  • the buckle includes: a connecting post, one end of the connecting post is connected to the insulating plate; and the engaging portion is connected to the other end of the connecting post And protruding toward the latching plate, the latching portion pressing against the bottom wall of the positioning card slot toward the end surface of the latching plate, the latching portion facing away from the latching plate
  • the end face is provided with a guide surface.
  • the connecting plate is a ring shape that surrounds the bottom plate, and the card board is connected to the connecting plate and disposed coplanar with the supporting plate.
  • the bottom plate, the connecting plate, the support plate, and the snap plate are formed integrally.
  • the inner spacer further includes a head connected to an end of the support plate facing away from the connecting plate, and at least a portion of the head is curved .
  • the head has a circular arc shape.
  • the thickness of the head is larger than the thickness of the support plate.
  • the profile of the head includes a first segment, a second segment, and a third segment that are sequentially connected, the first segment facing away from the end of the second segment and the
  • the support plate is connected to the surface of the pole core, and an end of the third section facing away from the second section is connected to a surface of the support plate facing away from the pole core, the first section being curved.
  • the second segment is linear, and the distance from the second segment to the pole core is greater than the distance from the support plate to the pole core.
  • the third segment is curved, and the radius of curvature of the first segment is smaller than the radius of curvature of the third segment.
  • the third segment includes two arc segments, and the centers of curvature of the two segments of the third segment are respectively located on both sides of the third segment.
  • the bottom plate and the support plate are each disposed in a direction parallel to the cover plate.
  • the connecting plate is perpendicular to the support plate and the bottom plate.
  • the tab is spaced apart from the bottom plate and the connecting plate.
  • a portion of the tab is located above the bottom plate and spaced apart from the bottom plate.
  • the conductive terminal is in an insulating and sealed connection with the cap plate.

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Abstract

一种单体电池、电池模组、动力电池和电动汽车，根据本公开实施例的单体电池，包括：壳体；盖板，盖板位于壳体的端部；极芯，极芯位于壳体内，极芯具有极耳；内隔圈，内隔圈包括底板、连接板和支撑板，底板设于极芯的朝向盖板的表面，连接板的一端与底板的一侧边缘相连且与底板的一侧边缘形成为弯折形，连接板的另一端与支撑板相连且与支撑板形成为弯折形，支撑板朝背离底板的方向延伸，极耳的一部分从支撑板朝向极芯的一侧表面上延伸至背离极芯的一侧的表面上；导电端子，导电端子设于盖板上，且与极耳电连接。

Description

单体电池、电池模组、动力电池和电动汽车
相关申请的交叉引用
本申请要求比亚迪股份有限公司于2018年03月23日提交的、中国专利申请号“201820409789.X”、发明名称为“单体电池、电池模组、动力电池和电动汽车”的优先权。
技术领域
本公开属于车辆制造技术领域，涉及一种单体电池和设有该单体电池的电池模组、设有该电池模组的动力电池、设有该动力电池的电动汽车。
背景技术
通常，动力电池具有至少两个导电端子，并采用双层连接片一端与导电端子连接，另一端夹住极耳以与极芯连接，从而接通电路。相关技术中，夹住极耳的连接片带动极耳进行弯折，盖板两侧的侧隔圈起到固定极耳与绝缘的作用，但在高度方向上会占据至少四层连接片的厚度，不利于电芯空间利用率的提升。双层连接片只夹住极耳的端部部分，对极耳的其他部分尤其是弯折区域起不到有效的整形效果。另外双层连接片的尖端贴合在极耳上，当单体电池处在极端条件如碰撞或振动条件下时，可能会割破极耳，严重时可能导致单体电池内阻增加，产热异常，有造成安全事故的风险，存在改进的空间。
发明内容
本公开旨在至少解决现有技术中存在的技术问题之一。为此，本公开提出一种单体电池，所述单体电池的内隔圈对极耳有良好的支撑、绝缘和整形作用，且不易割伤极耳。
根据本公开实施例的单体电池，包括：壳体；盖板，所述盖板位于所述壳体的端部；极芯，所述极芯位于所述壳体内，所述极芯具有极耳；内隔圈，所述内隔圈包括底板、连接板和支撑板，所述底板设于所述极芯的朝向所述盖板的表面，所述连接板的一端与所述底板的一侧边缘相连且与所述底板的一侧边缘形成为弯折形，所述连接板的另一端与支撑板相连且与所述支撑板形成为弯折形，所述支撑板朝背离所述底板的方向延伸，所述极耳的一部分从所述支撑板朝向所述极芯的一侧表面上延伸至背离所述极芯的一侧的表面上；导电端子，所述导电端子设于所述盖板上，且所述导电端子与所述极耳的背离所述支撑板的一侧的表面电连接。
根据本公开实施例的单体电池，在极芯与导电端子之间设置内隔圈，内隔圈可同时起 到支撑极耳、绝缘、整形极耳的作用，避免极耳与极芯发生短路，且极耳直接与导电端子焊接相连，极耳与导电端子不通过连接片相连可降低单体电池高度方向的空间占用，提高单体电池的空间利用率，增强单体电池的实用性。
本公开还提出一种电池模组，包括连接片和上述任一种实施例中所述的单体电池，所述单体电池之间通过连接片串联或并联。
本公开还提出一种动力电池，包括包体和设置在该包体内的电池模组，所述电池模组为上述实施例所述的电池模组。
本公开又提出了一种电动汽车，设置有上述实施例所述的动力电池。
所述电池模组、所述动力电池、所述电动汽车与上述的单体电池相对于现有技术所具有的优势相同，在此不再赘述。
本公开的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本公开的实践了解到。
附图说明
本公开的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：
图1-图2是根据本公开实施例的单体电池的结构示意图；
图3是根据本公开实施例的单体电池的内隔圈的结构示意图；
图4是根据本公开实施例的单体电池的内隔圈卡接于绝缘板的结构示意图；
图5是图4中A处的局部放大图。
附图标记：
单体电池100，
内隔圈10，底板11，连接板12，支撑板13，头部14，第一段141，第二段142，第三段143，避让槽15，卡接板16，定位卡槽161，
极芯20，极耳21，
过渡片30，壳体40，盖板50，绝缘板60，卡扣61，连接柱611，卡接部612，导向面6121，导电端子70。
具体实施方式
下面详细描述本公开的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描 述的实施例是示例性的，仅用于解释本公开，而不能理解为对本公开的限制。
在本公开的描述中，需要理解的是，术语“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本公开和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。此外，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本公开的描述中，除非另有说明，“多个”的含义是两个或两个以上。
在本公开的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本公开中的具体含义。
下面参考图1-图3描述根据本公开实施例的单体电池100。
如图1-图2所示，根据本公开一个实施例的单体电池100包括：壳体40、盖板50、极芯20、内隔圈10。
其中，盖板50位于壳体40的端部，极芯20设于单体电池100的内部，极芯20位于壳体40内，极芯20具有极耳21，极芯20通过极耳21与单体电池100的导电端子70相连，比如，极耳21与单体电池100的导电端子70焊接相连，实现极芯20与盖板50组件的引流作用，保证极芯20与盖板50组件正常的电流导通。
如图1-图2所示，内隔圈10可用于将单体电池100的导电端子70与极芯20间隔开，以将导电端子70与极芯20有效绝缘，如图3所示，内隔圈10包括底板11、连接板12和支撑板13，底板11支撑于极芯20，底板11设于极芯20朝向盖板50的表面，连接板12的一端与底板11的边沿相连，且连接板12的一端与底板11的一侧边缘形成为弯折形，即连接板12的延伸方向与底板11的延伸方向不同，比如，底板11沿水平方向延伸，连接板12朝向单体电池100的高度方向延伸。
如图1-图2所示，支撑板13与连接板12的另一端相连，且支撑板13与连接板12的另一端形成为弯折形，即支撑板13和底板11通过连接板12连接，支撑板13朝背离底板11的方向延伸，且支撑板13和底板11形成一定的高度差，可以理解的是，支撑板13与底板11之间的高度差可便于极耳21从极芯20的上表面伸出，极耳21延伸至支撑板13的下表面折弯，再沿支撑板13的下表面朝背离底板11的方向延伸，这样，支撑板13、连接板12、底板11依次连接为一个整体，极耳21的一部分从支撑板13朝向极芯20的一侧表面 上延伸至背离极芯20的一侧的表面上，在一个实施例中，极耳21沿支撑板13的下表面朝背离底板11的方向延伸，且极耳21绕过支撑板13的端部延伸至支撑板13的上表面，进而实现极耳21尤其弯折处的有效整形。
需要说明的是，如图3所示，底板11的两端均设有连接板12、支撑板13，即内隔圈10包括两段连接板12、两段支撑板13、一段底板11，这样，内隔圈10可同时与两个极耳21安装配合，以对极芯20的极耳21起到支撑、绝缘的作用，保证极耳21与导电端子70正常的电流导通。
如图1-图2所示，导电端子70设于盖板50上，且导电端子70与极耳21的背离支撑板13的一侧的表面电连接，即极耳21在弯折并绕支撑板13延伸后，极耳21的上表面与导电端子70贴合并通过焊接相连，使得极耳21与导电端子70具有较大的接触面积，有效地增强极耳21与导电端子70的过流能力，提升单体电池100的实用性能，其中，导电端子70与盖板50之间绝缘密封相连，这样，导电端子70与盖板50之间无电流导通。
在一个实施例中，如图1-图2所示，可将极芯20的极耳21与导电端子70直接焊接相连，内隔圈10在极耳21下方对极耳21起到支撑作用，并且在高度上将极耳21和极芯20间隔开，实现有效绝缘，极耳21沿着内隔圈10的外侧进行弯折，这样，极耳21不通过连接片而是直接焊接在导电端子70上，降低了高度方向的空间占用，有效地提高单体电池100的空间利用率。
根据本公开实施例的单体电池100，在极芯20与导电端子70之间设置内隔圈10，内隔圈10可同时起到支撑极耳21、绝缘、整形极耳21的作用，避免极耳21与极芯20发生短路，且极耳21直接与导电端子70焊接相连，极耳21与导电端子70不通过连接片相连可降低单体电池100高度方向的空间占用，提高单体电池100的空间利用率，增强单体电池100的实用性。
根据本公开实施例的单体电池100，如图1-图2所示，还包括过渡片30，过渡片30上具有通孔，导电端子70依次穿过盖板50、通孔，且导电端子70与过渡片30焊接相连，过渡片30背离盖板50的一侧表面与极耳的背离支撑板13的一侧表面焊接相连，这样，导电端子70通过过渡片30与极耳21相连，以使单体电池100的导电端子70与极芯20之间电流导通。
在一个实施例中，如图1-图2所示，本公开的单体电池100还包括绝缘板60，绝缘板60位于盖板50与过渡片30之间，绝缘板60上具有固定孔，导电端子70穿过固定孔以固定绝缘板60，由此，导电端子70依次穿过盖板50、绝缘板60的固定孔、过渡片30的通孔并与极耳21相连，同时使得导电端子70、绝缘板60、过渡片30及极耳21相对固定，保证单体电池100内部的整体结构完整。
其中，如图4-图5所示，内隔圈10与绝缘板60通过卡接形成固定连接，在一个实施例中，内隔圈10的端部设有定位卡槽161，绝缘板60具有卡扣61，卡扣61与定位卡槽161相配合，以将绝缘板60与内隔圈10相对固定，内隔圈10还包括卡接板16，卡接板16设于底板11的一侧边缘，在一个实施例中，卡接板16设于底板11沿长度方向的两端，且卡接板16沿底板11的宽度方向延伸，卡接板16与支撑板13位于底板11的相邻侧，可以理解的是，支撑板13位于底板11沿宽度方向的两端，且支撑板13沿底板11的长度方向延伸，这样，卡接板16与支撑板13沿底板11的周向间隔开设置，其中，定位卡槽161设于卡接板16背离底板11的端部，且定位卡槽161位于卡接板16朝向极芯20的表面，定位卡槽161定位卡槽161即定位卡槽161位于卡接板16背离绝缘板60的表面，卡接板16的端部设有避让槽15，需要说明的是，绝缘板60位于卡接板16背离极芯20的一侧的表面，由此，卡扣61从卡接板16背离极芯20的一侧穿过避让槽15，并延伸至卡接板16靠近极芯20的一侧，以便于卡扣61卡入卡接板16的定位卡槽161内，使得绝缘板60与内隔圈10稳定地连接固定。
在一些实施例中，如图4-图5所示，卡扣61包括连接柱611、卡接部612，连接柱611的一端与绝缘板60相连，即连接柱611背离极芯的一端与绝缘板60固定相连，卡接部612与连接柱611的另一端相连，即卡接部612与连接柱611靠近极芯的一端相连，且卡接部612朝靠近支撑板13卡接板16的方向凸出，卡接部612朝向卡接板16支撑板13的端面抵压定位卡槽161的底壁，卡接部612背离卡接板16支撑板13的端面设有导向面6121，导向面6121可便于支撑板13与卡扣61卡接。
需要说明的是，绝缘板60上设有相对设置的两组卡扣61，支撑板13上设有相对设置的两组定位卡槽161，且两组卡扣61的两组卡接部612的间距小于支撑板13的两端的间距，同时支撑板13两端的间距小于两组卡扣61的两组连接柱611之间的间距，其中，两组卡接部612设有相对设置的导向面6121，这样，将支撑板13的端部沿卡接部612的导向面6121按压，连接柱611受到来自导向面6121的压力后发生弯曲，内隔圈卡入两组连接柱611之间，同时，卡接部612可防止内隔圈从卡扣61上脱离，提高单体电池整体结构的稳定性。
根据本公开实施例的单体电池100，如图1-图3所示，底板11和支撑板13均沿平行于盖板50的方向设置，比如，底板11与单体电池100的极芯20平行并贴合，支撑板13通过连接板12与底板11相连，支撑板13为沿平行于底板11的方向延伸形成，底板11与支撑板13之间存在高度差，且底板11与极芯20平行，使得支撑板13与极芯20之间存在间距差，例如，在一些实施例中，连接板12垂直于支撑板13和底板11，极耳21与底板 11及连接板12间隔开，即连接板12、支撑板13、极芯20之间限定出一定空间，这样，限定出的空间可便于极耳21从极芯20中伸出并弯折，增强单体电池100各个零部件之间的设置合理性。
在一些实施例中，连接板12为环绕底板11一周的环形，卡接板16与连接板12相连，且卡接板16与支撑板13共面设置，可以理解的是，内隔圈10沿长度方向上包括依次连接的卡接板16、连接板12、底板11、连接板12、卡接板16，内隔圈10宽度方向上包括依次连接的支撑板13、连接板12、底板11、连接板12、支撑板13，由此，底板11的外侧设有沿周向延伸的连接板12，连接板12的外侧设有沿周向间隔开延伸设置的支撑板13和卡接板16，且底板11、连接板12、支撑板13、卡接板16形成为一体，利于提高内隔圈10的整体性，增强内隔圈10的结构强度，同时便于安装。
根据本公开实施例的单体电池100，如图3所示，内隔圈10还包括头部14，头部14为圆弧形，头部14与支撑板13背离连接板12的一端相连，且头部14的至少一部分为弧形，且头部14的厚度大于支撑板13的厚度，这样，极耳21沿支撑板13的下表面朝背离底板11的方向延伸至头部14，且极耳21绕过头部14并延伸至支撑板13的上表面，极耳21在绕过头部14处的弯折曲率较小，即极耳21的弯折应力较小，不易造成极耳21弯折断裂，且头部14的弧形段与极耳21接触时，不会割伤极耳21，避免因内隔圈10存在尖锐割破极耳21，提高单体电池100使用的安全性。
在一个实施例中，如图3所示，头部14的型线包括顺次相连的第一段141、第二段142和第三段143，第一段141背离第二段142的一端与支撑板13朝向极芯20的表面相连，第三段143背离第二段142的一端与支撑板13背离极芯20的表面相连，即第一段141、第二段142、第三段143从支撑板13的下表面延伸至支撑板13的上表面，这样，极耳21沿着支撑板13的下表面延伸至第一段141，再沿着第一段141的外表面延伸并依次绕过第二段142、第三段143，使得极耳21弯折延伸至支撑板13的上表面，进而与导电端子70贴合焊接相连。
其中，如图3所示，第一段141为弧形，极耳21在沿第一段141外侧延伸时，弧形第一段141不会割破极耳21，需要说明的是，极耳21为多层金属薄片，且极耳21硬度较低，极耳21在绕过内隔圈10的头部14时，极耳21可与内隔圈10的头部14面接触，这样，单体电池100处于极端条件如碰撞或振动条件下时，极耳21不会被内隔圈10割伤，有效地延长极耳21的使用寿命，进而提高单体电池100的使用性能。
如图3所示，第二段142为直线型，即极耳21在绕过内隔圈10的头部14时，极耳21至少部分沿直线延伸，且第二段142到极芯20的距离大于支撑板13到极芯20的距离，即第二段142的上表面高于支撑板13的上表面，换言之，内隔圈10的头部14的厚度大于支 撑板13的厚度，这样，极耳21在绕过内隔圈10的头部14时，极耳21弯折的弧度较大，即极耳21的弯折曲率较小，极耳21弯折时，极耳21内侧与极耳21外侧的应力均较小，使得极耳21在弯折时不易断裂，明显地提高了极耳21使用的安全性能，延长极耳21的使用寿命，便于长期使用。
如图3所示，第三段143为弧形，第一段141的曲率半径小于第三段143的曲率半径，极耳21在绕过第三段143时，极耳21可不与第三段143完全贴合，这样，极耳21绕过第二段142后，极耳21以小于第三段143的曲率半径延伸至支撑板13的上表面，即极耳21下表面与第三段143之间存在较小的间隙，间隙可在单体电池100处于极端条件如碰撞或振动条件下时吸收部分振动能量，减轻外界环境对单体电池100造成的破坏，也有利于提升单体电池100整体结构设计的合理性。
在一个实施例中，如图3所示，第三段143包括两段弧形，第三段143的两段弧形的曲率圆心分别位于第三段143的两侧，比如，第三段143与支撑板13相连的一段弧形的曲率圆心位于第三段143背离极芯20的一侧，第三段143与第二段142相连的一端弧形的曲率圆心位于第三段143靠近极芯20的一侧，这样，第三段143在支撑板13与第二段142之间形成圆滑的弧形过渡，同时也避免第三段143与极耳21接触时，割伤极耳21，提高单体电池100整体结构的合理性，同时增强极耳21的使用安全性。
当然，内隔圈10的头部14的形状不限于此，内隔圈10的头部14也可为椭圆、水滴状等，能降低对极耳21的损伤即可。
在一些实施例中，如图1-图3所示，极耳21的一部分位于底板11上方，即极耳21沿着支撑板13的上表面延伸至支撑板13背离头部14的一端后继续延伸，这样，极耳21与导电端子70连接的长度较大，即极耳21与导电端子70接触的面积较大，可有效地增强极耳21与导电端子70之间的过流能力，提升单体电池100的实用性，且极耳21的一部分与底板11间隔开，使得极耳21的一部分与导电端子70良好的贴合。
本公开还提出一种电池模组，设置有上述任一种实施例的单体电池，单体电池之间通过单体电池连接片串联或者并联形成电池模组。
本公开还提出一种动力电池。
根据本公开实施例的动力电池，设置有上述实施例的电池模组。
本公开又提出了一种电动汽车。
根据本公开实施例的电动汽车，设置有上述实施例的动力电池，根据本公开实施例的电动汽车，在极芯20与导电端子70之间设置内隔圈10，内隔圈10可同时起到支撑极耳21、绝缘、整形极耳21的作用，避免极耳21与极芯20发生短路，且极耳21直接与导电端子70焊接相连，极耳21与导电端子70不通过连接片相连可降低单体电池100高度方向 的空间占用，明显地提升整车的使用性能。
根据本公开实施例的单体电池，包括：壳体；盖板，所述盖板位于所述壳体的端部；极芯，所述极芯位于所述壳体内，所述极芯具有极耳；内隔圈，所述内隔圈包括底板、连接板和支撑板，所述底板设于所述极芯的朝向所述盖板的表面，所述连接板的一端与所述底板的一侧边缘相连且与所述底板的一侧边缘形成为弯折形，所述连接板的另一端与支撑板相连且与所述支撑板形成为弯折形，所述支撑板朝背离所述底板的方向延伸，所述极耳的一部分从所述支撑板朝向所述极芯的一侧表面上延伸至背离所述极芯的一侧的表面上；导电端子，所述导电端子设于所述盖板上，且所述导电端子与所述极耳的背离所述支撑板的一侧的表面电连接。
根据本公开实施例的单体电池，还包括过渡片，所述过渡片上具有通孔，所述导电端子依次穿过所述盖板、所述通孔且与所述过渡片焊接，所述过渡片背离所述盖板的一侧表面与所述极耳的背离所述支撑板的一侧表面焊接。
根据本公开实施例的单体电池，还包括绝缘板，所述绝缘板位于所述盖板与所述过渡片之间，所述绝缘板上具有固定孔，所述导电端子穿过所述固定孔以固定所述绝缘板。
根据本公开实施例的单体电池，所述内隔圈与所述绝缘板通过卡接形成固定连接。
根据本公开实施例的单体电池，所述内隔圈的端部设有定位卡槽，所述绝缘板具有与所述定位卡槽相配合的卡扣。
根据本公开实施例的单体电池，所述内隔圈还包括：卡接板，所述卡接板设于所述底板的一侧边缘，所述卡接板与所述支撑板位于所述底板的相邻侧，所述定位卡槽设于所述卡接板背离所述底板的端部，且位于所述卡接板朝向所述极芯的表面。
根据本公开实施例的单体电池，所述卡接板的所述端部设有用于避让所述卡扣的避让槽。
根据本公开实施例的单体电池，所述卡扣包括：连接柱，所述连接柱的一端与所述绝缘板相连；卡接部，所述卡接部与所述连接柱的另一端相连，且朝靠近所述卡接板的方向凸出，所述卡接部朝向所述卡接板的端面抵压所述定位卡槽的底壁，所述卡接部背离所述卡接板的端面设有导向面。
根据本公开实施例的单体电池，所述连接板为环绕所述底板一周的环形，所述卡接板与所述连接板相连，且与所述支撑板共面设置。
根据本公开实施例的单体电池，所述底板、所述连接板、所述支撑板、所述卡接板形成为一体。
根据本公开实施例的单体电池，所述内隔圈还包括：头部，所述头部与所述支撑板背离所述连接板的一端相连，且所述头部的至少一部分为弧形。
根据本公开实施例的单体电池，所述头部为圆弧形。
根据本公开实施例的单体电池，所述头部的厚度大于所述支撑板的厚度。
根据本公开实施例的单体电池，所述头部的型线包括顺次相连的第一段、第二段和第三段，所述第一段背离所述第二段的一端与所述支撑板朝向所述极芯的表面相连，所述第三段背离所述第二段的一端与所述支撑板背离所述极芯的表面相连，所述第一段为弧形。
根据本公开实施例的单体电池，所述第二段为直线型，且所述第二段到所述极芯的距离大于所述支撑板到所述极芯的距离。
根据本公开实施例的单体电池，所述第三段为弧形，所述第一段的曲率半径小于所述第三段的曲率半径。
根据本公开实施例的单体电池，所述第三段包括两段弧形，所述第三段的两段的曲率圆心分别位于所述第三段的两侧。
根据本公开实施例的单体电池，所述底板和所述支撑板均沿平行于所述盖板的方向设置。
根据本公开实施例的单体电池，所述连接板垂直于所述支撑板和所述底板。
根据本公开实施例的单体电池，所述极耳与所述底板及所述连接板间隔开。
根据本公开实施例的单体电池，所述极耳的一部分位于所述底板上方，且与所述底板间隔开。
根据本公开实施例的单体电池，导电端子与盖板之间绝缘密封连接。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示意性实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本公开的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
尽管已经示出和描述了本公开的实施例，本领域的普通技术人员可以理解：在不脱离本公开的原理和宗旨的情况下可以对这些实施例进行多种变化、修改、替换和变型，本公开的范围由权利要求及其等同物限定。

Claims (25)

  1. 一种单体电池，其特征在于，包括：
    壳体；
    盖板，所述盖板位于所述壳体的端部；
    极芯，所述极芯位于所述壳体内，所述极芯具有极耳；
    内隔圈，所述内隔圈包括底板、连接板和支撑板，所述底板设于所述极芯的朝向所述盖板的表面，所述连接板的一端与所述底板的一侧边缘相连且与所述底板的一侧边缘形成为弯折形，所述连接板的另一端与支撑板相连且与所述支撑板形成为弯折形，所述支撑板朝背离所述底板的方向延伸，所述极耳的一部分从所述支撑板朝向所述极芯的一侧表面上延伸至背离所述极芯的一侧的表面上；
    导电端子，所述导电端子设于所述盖板上，且所述导电端子与所述极耳的背离所述支撑板的一侧的表面电连接。
  2. 根据权利要求1所述的单体电池，其特征在于，还包括过渡片，所述过渡片上具有通孔，所述导电端子依次穿过所述盖板、所述通孔且与所述过渡片焊接，所述过渡片背离所述盖板的一侧表面与所述极耳的背离所述支撑板的一侧表面焊接。
  3. 根据权利要求2所述的单体电池，其特征在于，还包括绝缘板，所述绝缘板位于所述盖板与所述过渡片之间，所述绝缘板上具有固定孔，所述导电端子穿过所述固定孔以固定所述绝缘板。
  4. 根据权利要求3所述的单体电池，其特征在于，所述内隔圈与所述绝缘板通过卡接形成固定连接。
  5. 根据权利要求4所述的单体电池，其特征在于，所述内隔圈的端部设有定位卡槽，所述绝缘板具有与所述定位卡槽相配合的卡扣。
  6. 根据权利要求5所述的单体电池，其特征在于，所述内隔圈还包括：卡接板，所述卡接板设于所述底板的一侧边缘，所述卡接板与所述支撑板位于所述底板的相邻侧，所述定位卡槽设于所述卡接板背离所述底板的端部，且位于所述卡接板朝向所述极芯的表面。
  7. 根据权利要求6所述的单体电池，其特征在于，所述卡接板的所述端部设有用于避让所述卡扣的避让槽。
  8. 根据权利要求6或7所述的单体电池，其特征在于，所述卡扣包括：
    连接柱，所述连接柱的一端与所述绝缘板相连；
    卡接部，所述卡接部与所述连接柱的另一端相连，且朝靠近所述卡接板的方向凸出，所述卡接部朝向所述卡接板的端面抵压所述定位卡槽的底壁，所述卡接部背离所述卡接板的端面设有导向面。
  9. 根据权利要求6-8中任一项所述的单体电池，其特征在于，所述连接板为环绕所述底板一周的环形，所述卡接板与所述连接板相连，且与所述支撑板共面设置。
  10. 根据权利要求9所述的单体电池，其特征在于，所述底板、所述连接板、所述支撑板、所述卡接板形成为一体。
  11. 根据权利要求1-10中任一项所述的单体电池，其特征在于，所述内隔圈还包括：头部，所述头部与所述支撑板背离所述连接板的一端相连，且所述头部的至少一部分为弧形。
  12. 根据权利要求11所述的单体电池，其特征在于，所述头部为圆弧形。
  13. 根据权利要求11或12所述的单体电池，其特征在于，所述头部的厚度大于所述支撑板的厚度。
  14. 根据权利要求11-13中任一项所述的单体电池，其特征在于，所述头部的型线包括顺次相连的第一段、第二段和第三段，所述第一段背离所述第二段的一端与所述支撑板朝向所述极芯的表面相连，所述第三段背离所述第二段的一端与所述支撑板背离所述极芯的表面相连，所述第一段为弧形。
  15. 根据权利要求14所述的单体电池，其特征在于，所述第二段为直线型，且所述第二段到所述极芯的距离大于所述支撑板到所述极芯的距离。
  16. 根据权利要求14或15所述的单体电池，其特征在于，所述第三段为弧形，所述第一段的曲率半径小于所述第三段的曲率半径。
  17. 根据权利要求14-16中任一项所述的单体电池，其特征在于，所述第三段包括两段弧形，所述第三段的两段的曲率圆心分别位于所述第三段的两侧。
  18. 根据权利要求1-17中任一项所述的单体电池，其特征在于，所述底板和所述支撑板均沿平行于所述盖板的方向设置。
  19. 根据权利要求1-18中任一项所述的单体电池，其特征在于，所述连接板垂直于所述支撑板和所述底板。
  20. 根据权利要求1-19中任一项所述的单体电池，其特征在于，所述极耳与所述底板及所述连接板间隔开。
  21. 根据权利要求1-20中任一项所述的单体电池，其特征在于，所述极耳的一部分位于所述底板上方，且与所述底板间隔开。
  22. 根据权利要求1-21中任一项所述的单体电池，其特征在于，所述导电端子与所述盖板之间绝缘密封连接。
  23. 一种电池模组，其特征在于，包括连接片和如权利要求1-22中任意一项所述的单体电池，所述单体电池之间通过连接片串联或并联。
  24. 一种动力电池，包括包体和设置在该包体内的电池模组，其特征在于，所述电池模组为如权利要求23所述的电池模组。
  25. 一种电动汽车，其特征在于，设置有如权利要求24所述的动力电池。
PCT/CN2019/072662 2018-03-23 2019-01-22 单体电池、电池模组、动力电池和电动汽车 Ceased WO2019179232A1 (zh)

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