WO2023143083A1 - Ensemble plaque de couvercle de batterie, boîtier de batterie et batterie - Google Patents

Ensemble plaque de couvercle de batterie, boîtier de batterie et batterie Download PDF

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Publication number
WO2023143083A1
WO2023143083A1 PCT/CN2023/071731 CN2023071731W WO2023143083A1 WO 2023143083 A1 WO2023143083 A1 WO 2023143083A1 CN 2023071731 W CN2023071731 W CN 2023071731W WO 2023143083 A1 WO2023143083 A1 WO 2023143083A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery
cover
hole
pole
conductive
Prior art date
Application number
PCT/CN2023/071731
Other languages
English (en)
Chinese (zh)
Inventor
梁立维
汤国胜
张剑
欧阳进忠
Original Assignee
比亚迪股份有限公司
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 比亚迪股份有限公司 filed Critical 比亚迪股份有限公司
Publication of WO2023143083A1 publication Critical patent/WO2023143083A1/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
    • 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
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present disclosure relates to the technical field of batteries, and in particular, to a battery cover assembly, a battery casing and a battery.
  • An existing battery includes a battery cell and a battery cover disposed above the battery cell, and the electrodes on the battery cell body need to output electric energy through poles on the battery cover.
  • the pole on the battery cover needs to be connected to the cell body inside the battery case and the load outside the battery case.
  • the pole includes an insertion part and a cover part. The insertion part is inserted into the pole hole, and the cover part covers the pole hole.
  • some External water vapor can still enter the interior of the battery casing through the gap between the covering part and the battery cover, causing a problem of sealing failure.
  • the purpose of the present disclosure is to provide a battery cover assembly, a battery casing and a battery to solve the technical problems in the related art.
  • a battery cover assembly including:
  • the pole includes an insertion part and a cover part, the insertion part is inserted into the pole hole, the cover part protrudes from the cover body along the axial direction of the pole hole, and the cover part protrudes from the cover body along the pole hole.
  • the radial extension of the pole hole is such that the projection of the covering part on the cover body along the axial direction of the pole hole is located in the cover body, and the covering part is located along the pole.
  • the distance between the edge of the pole hole radially away from the pole hole and the hole wall of the pole hole is greater than or equal to 1.5 mm.
  • the covering part of the present disclosure extends radially along the pole hole, and by extending the radial dimension of the covering part, the flow path for external water vapor to enter the battery casing through the gap between the covering part and the cover plate body can be increased, thereby reducing the The leak rate improves the stability of the battery, and the above method will not increase the axial size of the pole, which is more convenient for the installation and arrangement of the battery body.
  • the cover part protrudes downward from the cover plate body along the axial direction of the pole hole, so that the cover part can be located inside the battery case, and the cover part is used for cooperating with the The tabs of the cells inside the battery case are electrically connected.
  • the covering portion protrudes upward from the cover plate body along the axial direction of the pole hole, so that the covering portion can be located outside the battery casing, and the insertion portion is used to communicate with the battery
  • the tabs of the cells inside the casing are electrically connected.
  • the tab is a positive tab of the cell.
  • the tab is a negative tab of the cell.
  • the insertion part includes a conductive column and a conductive plate, the conductive column is formed on the cover part, and the conductive plate protrudes from the outer peripheral surface of the conductive column along the radial direction of the conductive column.
  • the conductive pillar includes a conductive column and a conductive plate, the conductive column is formed on the cover part, and the conductive plate protrudes from the outer peripheral surface of the conductive column along the radial direction of the conductive column.
  • the conductive plate is integrally formed with the conductive column.
  • the conductive plate is connected to the conductive column.
  • the conductive pillar is inserted into the pole hole.
  • the conductive column includes a column body and an annular flange formed at an end of the column body away from the cover portion, and a first through hole is formed on the conductive plate and connected to the first through hole. connected second through holes, the diameter of the first through hole is smaller than the diameter of the second through hole, so that a stepped surface is formed between the first through hole and the second through hole, and the cylinder Inserted into the first through hole, the annular flange is located in the second through hole and connected to the stepped surface.
  • the outer surface of the annular flange is flush with the outer surface of the conductive plate.
  • the annular flange abuts against the stepped surface.
  • the maximum dimension of the insertion part in the radial direction of the pole hole is in the range of 0.8mm-1.5mm.
  • the battery cover assembly further includes an insulator, the insulator is mounted on the pole and clamped between the cover part and the cover body.
  • the insulating member has a thickness ranging from 0.1 mm to 0.2 mm.
  • the insulator is sealed and connected to the cover portion and the cover body respectively.
  • the outer edge of the insulator protrudes beyond the outer edge of the cover part along the radial direction of the pole hole, and the outer edge of the insulator and the outer edge of the cover body are in the The radial spacing of the pole holes is 1mm-1.5mm; or,
  • the outer edge of the cover part protrudes from the outer edge of the insulator along the radial direction of the pole hole, or is flush with the outer edge of the insulator, and the outer edge of the cover part is aligned with the cover
  • the distance between the outer edge of the plate body in the radial direction of the pole hole is 1mm-1.5mm.
  • a battery case comprising a case seat and the battery cover assembly as described above, the cover body of the battery cover assembly is covered on the case seat.
  • a battery including the above-mentioned battery case and a battery cell installed in the battery case.
  • the pole includes an insertion portion and a cover portion, and the cover portion extends along the radial direction of the pole hole, so that the projection of the cover portion on the cover body along the axial direction of the pole hole is located in the cover body, and The distance between the cover portion away from the edge of the pole hole along the radial direction of the pole hole and the hole wall of the pole hole is greater than or equal to 1.5mm.
  • the cover portion of the present disclosure is more By extending the size of the cover part in the radial direction of the pole hole, and making the distance between the cover part away from the edge of the pole hole and the hole wall of the pole hole along the radial direction of the pole hole greater than or equal to 1.5mm , can increase the flow path of external water vapor entering the inside of the battery case through the gap between the cover part and the cover plate body, thereby reducing the leakage rate (that is, the water vapor flowing from the outside of the pole hole into the pole hole within a unit time quantity), improve the stability of the battery.
  • the battery cover assembly provided by the present disclosure increases the effective sealing length between the pole and the cover body by increasing the radial dimension of the cover part of the pole, the above-mentioned method will not cause the pole to be in the axial direction.
  • the increase in size will not lead to an increase in the axial size of the battery, nor will it interfere with the installation and arrangement of the battery cells.
  • the distance between the edge of the cover part away from the pole hole and the pole hole wall along the radial direction of the pole hole can be selected, as long as An effective sealing effect can be achieved when the distance between the covering portion away from the edge of the pole hole along the radial direction of the pole hole and the hole wall of the pole hole is greater than or equal to 1.5 mm.
  • FIG. 1 is a cross-sectional view of a battery cover assembly provided in a first exemplary embodiment of the present disclosure
  • Fig. 2 is an enlarged view of part A of Fig. 1;
  • FIG. 3 is a cross-sectional view of a battery cover assembly provided in a second exemplary embodiment of the present disclosure
  • Fig. 4 is a cross-sectional view of a battery cover assembly provided in a third exemplary embodiment of the present disclosure
  • FIG. 5 is a cross-sectional view of a battery cover assembly provided in a fourth exemplary embodiment of the present disclosure.
  • Fig. 6 is a perspective view of a battery provided in an exemplary embodiment of the present disclosure.
  • up and down directions refer to up and down in a normal use state of the battery, which can be specifically shown with reference to the direction of the drawing in FIG. 1 .
  • “Far and near” means far and near from the corresponding structure.
  • the terms “first”, “second”, etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.
  • a battery cover assembly 1 including: a cover body 10 and a pole 20 , and a pole hole 11 is formed on the cover body 10 ;
  • the pole includes an insertion portion 21 and a cover portion 22.
  • the insertion portion 21 is inserted into the pole hole 11.
  • the cover portion 22 protrudes from the cover body 10 along the axial direction of the pole hole 11.
  • the cover portion 22 protrudes along the pole hole 11.
  • the distance L between the edge away from the pole hole 11 and the hole wall of the pole hole 11 is greater than or equal to 1.5 mm, so as to increase the effective sealing length between the pole and the cover plate body.
  • the pole includes an insertion portion 21 and a cover portion 22, and the cover portion 22 extends along the radial direction of the pole hole 11, so that the projection of the cover portion 22 on the cover body 10 along the axial direction of the pole hole 11 Located in the cover plate body 10, and the distance L between the edge of the pole hole 11 away from the edge of the pole hole 11 and the hole wall of the pole hole 11 along the radial direction of the pole hole 11 is greater than or equal to 1.5 mm, which is comparable to the prior art
  • the covering part 22 of the present disclosure extends along the radial direction of the pole hole 11, by extending the size of the covering part 22 in the radial direction of the pole hole 11, and making the covering part 22 away from the pole along the radial direction of the pole hole 11 The distance L between the edge of the hole 11 and the hole wall of the pole hole 11 is greater than or equal to 1.5mm, which can increase the flow path for external water vapor to enter the interior of the battery case 2 through the gap between the cover part 22 and the cover body 10,
  • the covering part of the present disclosure extends radially along the pole hole, and by extending the radial dimension of the covering part, the flow path for external water vapor to enter the battery casing through the gap between the covering part and the cover plate body can be increased, thereby reducing the The leak rate improves the stability of the battery, and the above method will not increase the axial size of the pole, which is more convenient for the installation and arrangement of the battery body.
  • the battery cover assembly 1 provided in the present disclosure increases the effective sealing length between the pole and the cover body 10 by increasing the radial dimension of the cover portion 22 of the pole, the above method will not cause extreme The increase in the axial dimension of the column will not lead to an increase in the axial dimension of the battery, nor will it interfere with the installation arrangement of the battery cell 4 .
  • the cover part 22 can be selected to be away from the edge of the pole hole 11 along the radial direction of the pole hole 11 and the pole hole.
  • the distance between the hole walls of 11, as long as the distance L between the cover part 22 away from the edge of the pole hole 11 along the radial direction of the pole hole 11 and the hole wall of the pole hole 11 is greater than or equal to 1.5mm can be effective sealing effect.
  • the above-mentioned covering part 22 can cover the pole hole 11 from the inside of the cover body 10 (ie, the side of the cover body 10 close to the battery 4 ), or it can cover the pole hole 11 from the outside of the cover body 10 (ie, the cover body is away from the battery 4 ). side) to cover the pole hole 11.
  • the covering portion 22 may protrude downward from the cover plate body 10 along the axial direction of the pole hole 11 .
  • the cover part 22 can be located inside the battery case 2 , and the cover part 22 is used for conductive connection with the tab 40 of the battery cell 4 inside the battery case 2 .
  • the covering part 22 is arranged inside the battery case 2 to cover the pole hole 11 from the inner side of the cover body 10, since the covering part 22 is also used for conductive connection with the tab 40 of the battery cell 4, and The radial dimension of the cover part 22 is longer, which is beneficial to increase the connection area between the tab 40 and the cover part 22 .
  • the covering part 22 can protrude upward from the cover plate body 10 along the axial direction of the pole hole 11, so that the covering part 22 can be located in the battery Outside the casing 2 , the insertion portion 21 is used for conductive connection with the tab 40 of the battery cell 4 inside the battery casing 2 .
  • the cover part 22 is arranged outside the battery case 2, which facilitates the installation and disassembly of the cover part 22 and the subsequent maintenance of the cover part 22, and, precisely because the cover part 22 protrudes from the cover body 10, it is also more convenient to connect the battery with external electrical equipment.
  • the cover part 22 may be electrically connected to the positive tab 40 of the battery cell 4 located in the battery case 2, or may be connected to the positive tab 40 located in the battery case 2.
  • the negative tab 40 of the battery cell 4 inside 2 is electrically connected, and similarly, in the embodiment where the cover portion 22 is located outside the battery case 2, the insertion portion 21 can be electrically connected to the positive tab 40 of the battery cell 4 inside the casing, It can also be electrically connected to the negative tab 40 of the battery cell 4 located in the battery case 2 , which is not limited in the present disclosure.
  • the insertion portion 21 may be columnar, and the columnar insertion portion 21 is inserted into the pole hole 11 .
  • the conductive plate 211 can be integrally formed with the conductive column 210, or the conductive plate 211 can be connected to the conductive column 210 (as shown in Figure 1 and Figure 3 shown).
  • the conductive plate 211 protrudes from the outer peripheral surface of the conductive post 210 to the conductive post 210 along the radial direction of the conductive post 210. That is to say, the cooperation between the conductive plate 211 and the conductive post 210 can increase the size of the insertion portion 21 along the axis of the post hole 11.
  • the projected area on the cover plate body 10 in the direction provides a larger contact area for the electrical connection between the tab 40 of the battery cell 4 in the battery case 2 or the electrical connection between the external electrical equipment and the insertion part 21, which is more convenient for external power consumption. Connection of the device or tab 40 to the insertion part 21 .
  • connection of the conductive plate 211 to the conductive column 210 means that the conductive plate 211 and the conductive column 210 are two mutually independent parts, so that when the above-mentioned battery cover plate assembly 1 is assembled, the conductive column 210 can be removed from the One side of the cover body 10 is inserted into the pole hole 11 , and then the conductive plate 211 is connected to the conductive post 210 from the other side of the cover body 10 by riveting or welding.
  • a first through hole and a second through hole communicating with the first through hole are formed on the conductive plate 211, the aperture of the first through hole is smaller than the aperture of the second through hole, so that the first through hole and the second through hole
  • a stepped surface 2111 is formed between the through holes, the cylinder 2100 is inserted into the first through hole, and the annular flange 2101 is located in the second through hole and connected to the stepped surface 2111 .
  • connection between the annular flange and the conductive plate 211 is welded to the stepped surface 2111 to realize the connection between the annular flange and the conductive plate 211 .
  • connection between the conductive plate 211 and the conductive post 210 can also be realized through a riveting process.
  • the present disclosure does not limit the above connection method, as long as the connection between the conductive post 210 and the conductive plate 211 can be realized.
  • the annular flange 2101 is located in the second through hole and connected to the stepped surface 2111 , the outer surface of the annular flange may be flush with the outer surface of the conductive plate 211 .
  • the effective sealing length is longer, and the cover portion 22 along the pole hole 11
  • the distance L between the edge radially away from the pole hole 11 and the hole wall of the pole hole 11 is related to the radial dimension of the pole hole 11, and the radial dimension of the pole hole 11 is related to the insertion part 21 in the pole hole.
  • the maximum dimension d in the radial direction of 11 is related, therefore, optionally, the maximum dimension d of the insertion portion 21 in the radial direction of the pole hole 11 may range from 0.8 mm to 1.5 mm.
  • the maximum dimension d of the insertion part 21 in the radial direction of the pole hole 11 ranges from 0.8 mm to 1.5 mm, it can meet the requirements of the battery's overcurrent capability without causing the insertion part 21 to cause the radial direction of the pole hole 11.
  • the increase in size leads to the problem that the distance L between the edge of the pole hole 11 and the hole wall of the pole hole 11 away from the cover portion 22 along the radial direction of the pole hole 11 decreases, so as to increase the cover portion 22 as much as possible Along the radial direction of the pole hole 11, the distance L between the edge of the pole hole 11 and the hole wall of the pole hole 11 is far away, so as to achieve the effect of reducing the leakage rate.
  • the maximum dimension d of the insertion portion 21 in the radial direction of the pole hole 11 refers to the columnar insertion portion 21
  • the battery cover assembly 1 further includes an insulator 30 installed on the pole and clamped between the cover portion 22 and the cover body 10 .
  • the insulator 30 installed between the cover part 22 and the cover body 10 can play a sealing role, thereby improving the sealing effect of the cover part 22 on the cover body 10;
  • the part 22 and the cover body 10 play the role of insulation.
  • the positive tab 40 and the negative tab 40 of the core 4 are connected, that is, the cover part 22 and the cover body 10 may have different electrical properties.
  • the insulating member 30 can be selected from PP glue (polypropylene), or insulating materials including polystyrene (PS), polyethylene (PE), polyester (PET), polyvinyl chloride (PVC), One of polyimide (PI), acrylonitrile butadiene styrene plastic (ABS), polycarbonate (PC), polyamide (PA) and ceramics.
  • PP glue polypropylene
  • PS polystyrene
  • PE polyethylene
  • PET polyester
  • PVC polyvinyl chloride
  • PI polyimide
  • ABS acrylonitrile butadiene styrene plastic
  • PC polycarbonate
  • PA polyamide
  • the thickness of the insulating member 30 may be between 0.1mm-0.2mm.
  • the insulator 30 can be hermetically connected to the cover portion 22 and the cover body 10 through a thermocompression sealing process.
  • the outer edge of the insulator 30 may protrude beyond the outer edge of the cover portion 22 in the radial direction of the pole hole 11.
  • the spacing x of the outer edge in the radial direction of the pole hole 11 is 1mm-1.5mm; or, as shown in FIGS. or be flush with the outer edge of the insulator 30, and the distance x between the outer edge of the covering portion 22 and the outer edge of the cover body 10 in the radial direction of the pole hole 11 is 1mm-1.5mm. That is to say, for the case where the outer edge of the insulating member 30 protrudes from the cover portion 22, the distance between the outer edge of the insulating member 30 and the outer edge of the cover body 10 is 1mm-1.5mm.
  • the distance between the outer edge of the covering part 22 and the outer edge of the cover body 10 is 1mm-1.5mm.
  • the generated heat radiation will affect the insulating member 30 , melt the insulating member 30 , and affect the insulating and sealing effect of the insulating member 30 .
  • the distance x between the outer edge of the insulating member 30 or the cover portion 22 and the outer edge of the cover plate in the radial direction of the pole hole 11 is controlled at 1mm-1.5mm, which can avoid heat radiation to the insulating member 30 during the welding process.
  • the effect is that the radial dimension of the covering part 22 can be increased, thereby increasing the effective sealing length, reducing the leakage rate, and improving the stability of the battery.
  • Fig. 2-Fig. The board body 10 is covered on the shell base 3 .
  • a battery including the battery casing 2 as described above and the battery cell 4 disposed in the battery casing 2 .
  • one of the positive tab 40 and the negative tab 40 of the cell 4 is connected to the pole, and the other of the positive tab 40 and the negative tab 40 of the cell 4 is connected to the case base 3 or the cover body 10 connect.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

L'invention concerne un ensemble plaque de couvercle de batterie, un boîtier de batterie et une batterie. L'ensemble plaque de couvercle de batterie comprend un corps de plaque de couvercle et un pôle ; un trou de pôle est ménagé sur le corps de plaque de couvercle ; le pôle comprend une partie d'insertion et une partie de recouvrement ; la partie d'insertion est insérée dans le trou de pôle ; la partie de recouvrement fait saillie hors du corps de plaque de recouvrement dans le sens axial du trou de pôle ; la partie de recouvrement s'étend dans le sens radial du trou de pôle, de telle sorte que la projection de la partie de recouvrement sur le corps de plaque de recouvrement dans le sens axial du trou de pôle est située dans le corps de plaque de recouvrement ; et une distance entre le bord de la partie de recouvrement éloignée du trou de pôle dans le sens radial du trou de pôle et la paroi de trou du trou de pôle est supérieure ou égale à 1,5 mm.
PCT/CN2023/071731 2022-01-27 2023-01-10 Ensemble plaque de couvercle de batterie, boîtier de batterie et batterie WO2023143083A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202220234704.5 2022-01-27
CN202220234704.5U CN216980726U (zh) 2022-01-27 2022-01-27 电池盖板组件、电池外壳以及电池

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Publication Number Publication Date
WO2023143083A1 true WO2023143083A1 (fr) 2023-08-03

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CN (1) CN216980726U (fr)
WO (1) WO2023143083A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117691267A (zh) * 2024-02-04 2024-03-12 蜂巢能源科技股份有限公司 电池及电池包

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN216980726U (zh) * 2022-01-27 2022-07-15 比亚迪股份有限公司 电池盖板组件、电池外壳以及电池

Citations (4)

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Publication number Priority date Publication date Assignee Title
CN107658395A (zh) * 2017-09-15 2018-02-02 惠州亿纬锂能股份有限公司 一种锂离子电池
DE102018200159A1 (de) * 2018-01-08 2019-07-11 Robert Bosch Gmbh Deckelbaugruppe für eine Batteriezelle und Verfahren zum Herstellen derselben
CN112290131A (zh) * 2020-11-18 2021-01-29 江门市元熙科技有限公司 一种扣式电池
CN216980726U (zh) * 2022-01-27 2022-07-15 比亚迪股份有限公司 电池盖板组件、电池外壳以及电池

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107658395A (zh) * 2017-09-15 2018-02-02 惠州亿纬锂能股份有限公司 一种锂离子电池
DE102018200159A1 (de) * 2018-01-08 2019-07-11 Robert Bosch Gmbh Deckelbaugruppe für eine Batteriezelle und Verfahren zum Herstellen derselben
CN112290131A (zh) * 2020-11-18 2021-01-29 江门市元熙科技有限公司 一种扣式电池
CN216980726U (zh) * 2022-01-27 2022-07-15 比亚迪股份有限公司 电池盖板组件、电池外壳以及电池

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117691267A (zh) * 2024-02-04 2024-03-12 蜂巢能源科技股份有限公司 电池及电池包
CN117691267B (zh) * 2024-02-04 2024-04-12 蜂巢能源科技股份有限公司 电池及电池包

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