WO2023115744A1 - Batterie au lithium-ion pratique pour le regroupement - Google Patents

Batterie au lithium-ion pratique pour le regroupement Download PDF

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Publication number
WO2023115744A1
WO2023115744A1 PCT/CN2022/084242 CN2022084242W WO2023115744A1 WO 2023115744 A1 WO2023115744 A1 WO 2023115744A1 CN 2022084242 W CN2022084242 W CN 2022084242W WO 2023115744 A1 WO2023115744 A1 WO 2023115744A1
Authority
WO
WIPO (PCT)
Prior art keywords
pole
ion battery
lithium
casing
grouping according
Prior art date
Application number
PCT/CN2022/084242
Other languages
English (en)
Chinese (zh)
Inventor
付垚
张宏飞
俞会根
Original Assignee
北京卫蓝新能源科技有限公司
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 北京卫蓝新能源科技有限公司 filed Critical 北京卫蓝新能源科技有限公司
Publication of WO2023115744A1 publication Critical patent/WO2023115744A1/fr

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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/317—Re-sealable arrangements
    • 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
    • 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 field of batteries, in particular to a lithium-ion battery that is convenient for grouping.
  • the traditional cell form has a relatively large limitation in the use of height space in the battery system.
  • the cells need to be connected to each other by connecting rows, and an insulating layer needs to be made on the aluminum row. A certain space is reserved between the insulating layer and the top of the battery system to prevent risks caused by insulation failure.
  • the explosion-proof valve of the square-shell cell in the prior art is flush with the top cover, and the structure of the cell limits the design of directional exhaust when thermal runaway occurs in the module system.
  • the embodiment of the present application provides a lithium-ion battery that is convenient for grouping, including: a battery cell and a casing arranged outside the battery cell; a concave structure is provided on the side edge of the casing, and a Pole, the pole includes a positive pole and a negative pole, the positive pole and the negative pole are connected to the battery core through the guide handles that are separately set corresponding to different poles, the positive pole and the negative pole are connected to each other.
  • the distance from the surface to the bottom of the recessed structure is smaller than the distance from the surface of the edge of the casing to the bottom of the recessed structure, and a groove is provided on the edge of the casing, and an explosion-proof valve is arranged in the groove.
  • the explosion-proof valve is arranged at the bottom of the groove.
  • the depth of the recessed structure is ⁇ H, and the size of the depth is 3mm ⁇ H ⁇ 100mm; the distance between the positive pole and the negative pole and the upper surface of the casing is ⁇ H1, and the distance is 0mm ⁇ ⁇ H1 ⁇ 100mm; the length of the concave structure is ⁇ L, and the length dimension is 3mm ⁇ L ⁇ 100mm.
  • the casing includes a casing main body and an upper cover arranged on the casing main body.
  • L-shaped concave structures are respectively provided at the joints of two adjacent sides of the housing.
  • the positive pole and the negative pole disposed on the concave structure are arranged in an L shape.
  • the L-shaped positive pole and negative pole are welded to the guide shank perpendicular to the upper surface of the casing, and the part parallel to the upper surface of the casing is used to connect to the bus bar during the battery grouping process.
  • the positive pole and the negative pole disposed on the concave structure are both arranged in a column shape, and the protruding direction is to protrude toward the outer surface of the casing.
  • the orientation of the positive pole and the negative pole is vertical or horizontal.
  • the groove and the concave structure are arranged on the same edge, and the groove and the concave structure communicate with each other.
  • the groove and the concave structure are arranged separately from each other.
  • the cell is a laminated cell or a wound cell.
  • each group of pole pieces consists of a positive pole piece, a negative pole piece, and a pole piece arranged between the positive pole piece and the negative pole piece.
  • the separator is composed of laminated sheets, and protruding tabs are provided on the positive pole piece and the negative pole piece.
  • the positive electrode sheet includes a positive electrode active material layer and a positive electrode sheet foil layer arranged on the side surface of the positive electrode material active material layer, the positive electrode sheet foil layer is an aluminum foil layer, and the positive electrode sheet foil layer is provided with a positive electrode sheet relative to the positive electrode active material layer.
  • the pole lug, the positive pole lug is used for the connection between the positive pole pieces.
  • the negative electrode sheet includes a negative electrode active material layer and a negative electrode sheet foil layer arranged on the side surface of the negative electrode material active material layer, the negative electrode sheet foil layer is a copper foil layer, and the negative electrode sheet foil layer is provided with a The negative pole lug is used for the connection between the pole pieces.
  • the positive pole lug arranged on the positive pole piece deviates toward the direction of the positive pole pole; the negative pole lug disposed on the negative pole piece deviates towards the direction of the negative pole pole.
  • the guide handle includes a first section connected to the pole and a second section connected to the electric core; the first section is connected to the pole, and the second section is connected to the pole The tab connection of the battery cell.
  • This application sets up grooves and explosion-proof valves in the grooves. While improving the volume grouping efficiency of the cells, it also realizes the design of directional exhaust and fire protection to prevent thermal runaway, which greatly improves the safety of the system. sex.
  • Fig. 1 is the overall structure schematic diagram of embodiment 1 of the present application.
  • FIG. 2 is an enlarged schematic diagram of pole setting in Embodiment 1 of the present application.
  • Fig. 3 is a schematic diagram of the internal explosion of Embodiment 1 of the present application.
  • Fig. 4 is a schematic diagram of the structure of the first guide handle in Example 1 of the present application.
  • Fig. 5 is a schematic diagram of the structure of the second guide handle in Embodiment 1 of the present application.
  • Fig. 6 is a schematic diagram of the structure of the third guide handle in Example 1 of the present application.
  • FIG. 7 is a schematic diagram of the overall structure of Embodiment 2 of the present application.
  • FIG. 8 is an enlarged schematic diagram of pole setting in Embodiment 2 of the present application.
  • Fig. 9 is a schematic diagram of the cell arrangement of Example 2 of the present application.
  • Figure 10 is a schematic diagram of the internal explosion of Embodiment 2 of the present application.
  • Fig. 11 is a schematic diagram of the structure of the guide handle in Example 3 of the present application.
  • Figure 12 is a schematic diagram of the internal explosion of Embodiment 3 of the present application.
  • Fig. 13 is a schematic diagram of an internal section of Embodiment 3 of the present application.
  • Fig. 14 is a schematic diagram of another arrangement method of the upper cover of the present application.
  • a lithium-ion battery that is convenient for grouping includes: a battery cell and a casing 1 covering the battery cell; the casing 1 is a rectangular parallelepiped structure, and a There are recessed structures 112, which are symmetrically arranged in this embodiment, and poles 111 are respectively arranged on the symmetrically arranged recessed structures 112, and the poles 111 include positive poles 1111 and negative poles 1112, and positive poles 1111 and the negative pole 1112 are connected to the battery core through the guide handle 4 provided separately corresponding to different poles, and the distance from the surface of the positive pole 1111 and the negative pole 1112 to the bottom surface of the recessed structure 112 is less than that of the edge of the housing 1
  • the distance from the surface to the bottom surface of the recessed structure 112 is that a groove 113 is provided between the symmetrically arranged recessed structures 112 on the housing 1 , and an explosion-proof valve 2 is arranged in the groove 113 .
  • the groove 113 and the recessed structure 112 can be arranged in communication or separately. In this embodiment, the groove 113 and the recessed structure 112 are arranged separately.
  • the groove 113 is arranged at a symmetrical central position between the symmetrically arranged recessed structures 112 on the housing 1 , and the explosion-proof valve 2 is arranged at the bottom of the groove 113 .
  • connection between the groove 113 and the recessed structure 112 is to form a larger groove structure (not shown in the figure) after connecting the recessed structure 112 and the groove 113, the positive pole 1111, the negative pole 1112 And the explosion-proof valve 2 is adjacently arranged in the communicated groove structure.
  • the battery cell is composed of several groups of pole pieces in the form of stacked sheets, and a diaphragm 34 is arranged between adjacent groups of pole pieces;
  • the diaphragm 34 between the pole piece 311 and the negative pole piece 312 is composed of laminations, and both the positive pole piece 311 and the negative pole piece 312 are provided with protruding pole piece foil layers (32, 33).
  • the structure of the battery cell is as follows: the separator 34 , the positive electrode piece 311 , the separator 34 , the negative electrode piece 312 , and the separator 34 are arranged circularly in sequence according to the above sequence.
  • the positive electrode sheet 311 includes a positive electrode active material layer and a positive electrode sheet foil layer arranged on the side surface of the positive electrode material active material layer, the positive electrode sheet foil layer is an aluminum foil layer, and the positive electrode sheet foil layer is arranged relative to the positive electrode active material layer There is a positive pole lug 32 , which is used for the connection between the positive pole pieces 311 and the connection between the positive pole piece 311 and the guide handle 4 .
  • the negative electrode sheet 312 includes a negative electrode active material layer and a negative electrode sheet foil layer arranged on the side surface of the negative electrode material active material layer, the negative electrode sheet foil layer is a copper foil layer, and the negative electrode sheet foil layer is opposite to the negative electrode active material layer.
  • a negative pole lug 33 is provided, and the negative pole lug 33 is used for the connection between the negative pole pieces 312 and the connection between the negative pole piece 312 and the lead handle 4 .
  • the protruding structure of the pole piece foil layer of the positive pole piece 311 protrudes positively in the direction of the upper cover 11, and a positive pole lug 32 is provided, and the positive pole lug 32 is offset to the direction of the positive pole pole 1111; the pole piece of the negative pole piece 312
  • the negative pole tab 33 on the foil layer protrudes toward the upper cover 11 , and the negative pole tab 33 is offset toward the negative pole pole 1112 .
  • the depth of the recessed structure 112 is ⁇ H, and the size of the depth is 3mm ⁇ H ⁇ 100mm; the distance between the positive pole 1111 and the negative pole 1112 and the upper surface of the casing 1 is ⁇ H1, and the distance is 0mm ⁇ ⁇ H1 ⁇ 100mm; the length of the concave structure is ⁇ L, and the length dimension is 3mm ⁇ L ⁇ 100mm.
  • the housing 1 includes a housing main body 12 and an upper cover 11 disposed on the housing main body 12, the two ends of the upper cover 11 are respectively provided with L-shaped recessed structures 112, and the positive electrode disposed on the recessed structures 112
  • the post 1111 and the negative pole post 1112 are also arranged in an L shape.
  • the L-shaped positive pole 1111 and negative pole 1112 are welded to the guide handle 4 perpendicular to the upper surface of the casing 1 , and are used for welding with the busbar during battery assembly process.
  • the upper cover 101 can be a flat plate structure that is punched or bent, which can further improve the space utilization of the battery cell.
  • the recessed structure 112 includes: a first recessed structure 1121 disposed at one end of the upper cover 11 and a second recessed structure 1122 disposed at the other end of the upper cover 11 , the positive pole 1111 is disposed in the first recessed structure 1121 , the negative pole 1112 is disposed in the second concave structure 1122 .
  • the guide handle 4 includes a first section 41 connected to the pole 111 and a second section 42 connected to the electric core.
  • the guide handle is arranged in three sections, and the guide handle 4 is composed of a first section 41, a second section 42 and a third section 42 connecting the first section 41 and the second section, the first section, the second section Adjacent sides of the second section and the third section are perpendicular to each other, wherein the first section 41 is connected to the pole 104 , and the second section 42 is connected to the tab.
  • the first section 403 of the guide handle 4 is arranged in an L shape with the third section, and the first section is welded with the L-shaped pole 22 ; the second section 404 is connected with the third section and is arranged in a T shape.
  • the guide handle 4 is designed as a stepped structure that is perpendicular to each other; wherein the first section 401 is welded to the battery pole 22, and the second section 402 is welded to the positive pole (negative pole). ) tab welding.
  • the guide handle 4 and the foil layer of the pole piece are welded by laser or ultrasonic to complete the structural and electrical connection.
  • the welded upper cover 11 , the positive and negative electrode sheets 31 and the diaphragm are integrally put into the battery lower case 1 , and the upper cover 11 and the lower case 1 are sealed by laser welding on the joint surface.
  • the pole 111 By arranging the pole 111 in an L-shaped recessed structure 112, on the one hand, it is possible to maximize the use of the internal space of the battery and achieve a larger battery capacity design; on the other hand, it is also possible to realize that the battery will soon become a battery pack During the system process, the upper surface of the battery can coincide with the upper cover 11 of the battery system to achieve better utilization of the space of the battery system and improve the volume efficiency of battery system integration, and the L-shaped post 111 has a larger contact area , better security and stability in actual use.
  • the pole 111 is composed of a pole conductor 21 and an insulating seal 22 arranged around the side of the pole conductor 21 .
  • Both the pole conductor 21 and the insulating seal 22 have an L-shaped structure; in the L-shaped structure of the pole conductor 21, the part perpendicular to the upper surface of the battery is welded to the tab 41, and the part parallel to the upper surface of the battery is used for the battery grouping process. After the welding is completed, the upper surface of the bus bar is not higher than the upper surface of the battery; through the above design, on the one hand, it can maximize the use of the internal space of the battery to design a larger battery positive and negative pole pieces (51, 52), so as to realize the larger capacity design of the square shell battery.
  • the upper surface of the battery can be attached to the upper cover 11 of the battery system during the process of integrating the battery into a battery system, so as to realize a better space for the battery system. Utilize, improve the volumetric efficiency of battery system integration.
  • the present embodiment is similarly applicable to square-shell batteries in which the pole pieces 31 are wound.
  • the housing includes a housing main body 12 and an upper cover 11 arranged on the housing main body 12, and the two ends of the upper cover 11 are respectively arranged in an L shape.
  • the concave structure 112; but the pole 10 (positive pole 102 and negative pole 103) at the bottom of the concave structure 112 is set in a columnar shape (square column, round column and other columnar structures), and its extension direction is upward cover 11 protruding in the direction of the upper surface.
  • the positive pole tabs 32 of the pole piece foil layer of the positive pole piece 311 protrude toward one side, and are connected to the positive pole pole 102 through the guide handle 4; the negative pole tabs of the pole piece foil layer of the negative pole piece 312 33 protrudes toward the other side, and is connected to the negative pole 103 through the guide handle 4 .
  • the housing 1 includes a housing body 12 and an upper cover 11 arranged on the housing main body 12, and the two ends of the upper cover 11 are respectively provided with L-shaped The set concave structure 112; but the poles 20 (positive pole pole 201 and negative pole pole 202) arranged on the sides of the sunken structure 112 are arranged in a columnar shape (square pole, round pole and other heterosexual columnar structures), and its extension direction To protrude toward the side surface of the housing 1 .
  • the guide handle 4 is arranged in an L shape by a first section and a second section, wherein the first section 405 is welded to the pole 20 , and the second section 406 is welded to the tab.
  • the length L1 of the guide handle 4 is not greater than the height of the casing 1, and the width W of the guide handle 4 is not greater than the width of the pole 10.
  • the present embodiment is similarly applicable to square-shell batteries in which the pole pieces 31 are wound.
  • the aluminum row used for the series and parallel connection of the battery cells can be arranged in the reserved space between the highest point of the pole and the upper surface or side surface of the shell.
  • the upper surface or side surface of the housing can be closer to the upper cover or side surface of the battery system; compared with the existing pole protrusions and the parallel connection of battery strings on the surface of the housing, the space between the poles is reduced. Waste, the space utilization efficiency of the battery system composed of batteries is significantly improved.
  • the space utilization rate of the present application is significantly improved, resulting in a significant increase in the volumetric energy efficiency of the battery system.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Abstract

La présente invention concerne une batterie au lithium-ion pratique pour le regroupement, la batterie au lithium-ion comprenant un élément et une coque, qui est disposée à l'extérieur de l'élément, un bord latéral de la coque comportant une structure d'évidement sur laquelle des bornes d'électrode sont disposées ; les bornes d'électrode comprennent une borne d'électrode positive et une borne d'électrode négative, qui sont toutes deux connectées à l'élément au moyen de poignées de guidage agencées séparément correspondant aux différentes bornes d'électrode, la distance de la surface de la borne d'électrode positive et de la surface de la borne d'électrode négative à une face inférieure de la structure d'évidement étant inférieure à la distance de la surface du bord de la coque à la face inférieure de la structure d'évidement ; et le bord de la coque comportant un évidement dans lequel est disposé une soupape antidéflagrante. La présente invention résout les problèmes des batteries de l'état de la technique selon lesquels l'efficacité de groupe volumique et la densité d'énergie volumique sont faibles et une structure cellulaire limite la conception d'échappement directionnel lorsque l'emballement thermique se produit dans un système de module.
PCT/CN2022/084242 2021-12-20 2022-03-31 Batterie au lithium-ion pratique pour le regroupement WO2023115744A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202123217396.X 2021-12-20
CN202123217396.XU CN216698663U (zh) 2021-12-20 2021-12-20 一种便于成组的锂离子电池

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WO2023115744A1 true WO2023115744A1 (fr) 2023-06-29

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PCT/CN2022/084242 WO2023115744A1 (fr) 2021-12-20 2022-03-31 Batterie au lithium-ion pratique pour le regroupement

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WO (1) WO2023115744A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN216389486U (zh) * 2021-12-20 2022-04-26 北京卫蓝新能源科技有限公司 一种方壳锂离子电池

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102623652A (zh) * 2011-01-31 2012-08-01 Sb锂摩托有限公司 可再充电电池
CN206727177U (zh) * 2017-03-16 2017-12-08 宁德时代新能源科技股份有限公司 二次电池及电池包
CN110021721A (zh) * 2018-01-08 2019-07-16 比亚迪股份有限公司 电池模组及汽车
CN209328956U (zh) * 2018-12-11 2019-08-30 中兴高能技术有限责任公司 电池盖板、电池绝缘板、电池盖板组件、电池壳及电池
CN112310514A (zh) * 2020-10-27 2021-02-02 合肥国轩高科动力能源有限公司 锂离子电池

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102623652A (zh) * 2011-01-31 2012-08-01 Sb锂摩托有限公司 可再充电电池
CN206727177U (zh) * 2017-03-16 2017-12-08 宁德时代新能源科技股份有限公司 二次电池及电池包
CN110021721A (zh) * 2018-01-08 2019-07-16 比亚迪股份有限公司 电池模组及汽车
CN110021716A (zh) * 2018-01-08 2019-07-16 比亚迪股份有限公司 电池单元、电池模组及汽车
CN209328956U (zh) * 2018-12-11 2019-08-30 中兴高能技术有限责任公司 电池盖板、电池绝缘板、电池盖板组件、电池壳及电池
CN112310514A (zh) * 2020-10-27 2021-02-02 合肥国轩高科动力能源有限公司 锂离子电池

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