WO2023240904A1 - Élément de batterie scellé par un processus de rainurage et d'étanchéité ainsi que module de batterie - Google Patents

Élément de batterie scellé par un processus de rainurage et d'étanchéité ainsi que module de batterie Download PDF

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Publication number
WO2023240904A1
WO2023240904A1 PCT/CN2022/129988 CN2022129988W WO2023240904A1 WO 2023240904 A1 WO2023240904 A1 WO 2023240904A1 CN 2022129988 W CN2022129988 W CN 2022129988W WO 2023240904 A1 WO2023240904 A1 WO 2023240904A1
Authority
WO
WIPO (PCT)
Prior art keywords
sealed battery
cover plate
battery core
annular
roll
Prior art date
Application number
PCT/CN2022/129988
Other languages
English (en)
Chinese (zh)
Inventor
肖天丽
陈敏
李尚益
黄利明
Original Assignee
湖北亿纬动力有限公司
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 湖北亿纬动力有限公司 filed Critical 湖北亿纬动力有限公司
Publication of WO2023240904A1 publication Critical patent/WO2023240904A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—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
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • 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
    • 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
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • 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
    • 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 application relates to the field of battery technology, for example, to a roll groove sealed battery cell and a battery module.
  • Lithium-ion batteries are widely used in the 3C field and the field of power tools due to their advantages of high specific energy, long cycle life, good safety, light weight, no memory effect and no pollution. With the continuous development of lithium-ion battery technology, higher requirements have been placed on the quality and service life of lithium-ion batteries.
  • the cells of some lithium-ion batteries are often sealed by rolling groove sealing.
  • the electrolyte inside the cells will expand with the increase of use time, which is prone to occur.
  • the cover assembly protrudes outward, it is easy to cause a short circuit and have low safety performance.
  • the edge of the cover assembly that is, the position close to the shell, is subject to compressive stress. Larger, the compressive stress on the center of the cover assembly is lower. When sealing, the edges of the cover assembly will collapse seriously, which may easily cause poor sealing, leakage, and shorten the service life of the battery.
  • This application provides a cell and battery module with a roll groove seal.
  • the cover plate is not easy to bulge and deform outwards, has sufficient sealing strength, is not prone to leakage, has a long service life, and has good safety performance.
  • an embodiment of the present application provides a roll groove sealed battery core.
  • the roll groove sealed battery core includes:
  • the cover plate is fastened at the opening and connected to the housing through a rolling groove seal.
  • the cover plate includes a fixed part, a first protruding part and a recessed part that are connected to each other.
  • the lower end surface of the fixed part is provided with an annular limiting groove;
  • Sealing ring the sealing ring is arranged between the housing and the fixed part, and the sealing ring is provided with an annular protrusion at a position corresponding to the annular limiting groove, and the annular protrusion is clamped on inside the annular limiting groove.
  • the first protruding part is annular, and the first protruding part is provided with a circular notch.
  • the first protruding portion is annular, and the first protruding portion is provided with a C-shaped notch and a connecting portion, and the C-shaped notch and the connecting portion form a circle.
  • the central angle corresponding to the connecting portion is 5° to 20°.
  • the recessed portion is provided with a second protruding portion, the second protruding portion is annular, and the highest point of the second protruding portion is lower than the highest point of the first protruding portion. point.
  • the depth of the annular limiting groove is smaller than the height of the annular protrusion.
  • the height difference between the annular limiting groove and the annular protrusion is 0.2 mm to 0.6 mm.
  • the diameter of the cover plate is 38 mm to 45 mm, and the thickness of the cover plate is 0.3 mm to 2.0 mm.
  • the thickness of the sealing ring is 0.5 mm to 1.5 mm.
  • the present application provides a battery module, including the roll-groove sealed battery core in any of the above solutions, and a plurality of the roll-groove sealed battery cores are provided.
  • the present application provides a roll groove sealed battery core.
  • the roll groove sealed battery core includes a shell, a cover plate and a sealing ring.
  • One end of the shell has an opening
  • the cover plate is fastened at the opening
  • the cover plate includes interconnected
  • the fixed part, the first convex part and the recessed part, the first convex part and the recessed part can absorb the minor deformation of the cover plate and avoid the short circuit or poor connection caused by the surface of the cover plate protruding from the opening edge of the housing.
  • the sealing ring is arranged between the shell and the cover plate.
  • the sealing ring When the shell and the cover plate are fixed by rolling groove sealing, the sealing ring is pressed between the shell and the cover plate, and the lower end surface of the fixed part is provided with an annular Limit groove, the sealing ring is provided with an annular protrusion, and the annular protrusion is clamped in the annular limit groove.
  • the seal ring and the cover plate are prevented from being displaced during sealing. phenomenon to ensure accurate positioning between the cover plate, sealing ring and casing, reliable sealing, and less prone to leakage.
  • the present application also provides a battery module, which includes the above-mentioned roll-groove sealed battery cells.
  • a battery module which includes the above-mentioned roll-groove sealed battery cells.
  • the cover plates of the roll-grooved sealed battery cells of the battery module are evenly stressed and are not easily deformation occurs, and the sealing is reliable, not easy to leak, and has good safety performance.
  • Figure 1 is a schematic structural diagram of a roll groove sealed battery core provided in Embodiment 1 of the present application;
  • Figure 2 is a partial enlarged view of point A in Figure 1;
  • Figure 3 is a partial enlarged view of B in Figure 1;
  • Figure 4 is a top view of the cover plate provided in Embodiment 1 of the present application.
  • Figure 5 is a top view of the cover plate provided in Embodiment 2 of the present application.
  • Shell 100. Shell; 200. Cover plate; 210. Fixed part; 2101. Annular limiting groove; 220. First protruding part; 2201. Circular notch; 2202. C-shaped notch; 2203. Connection part; 230 , recessed portion; 240, second protruding portion; 300, sealing ring; 310, annular protrusion.
  • connection should be understood in a broad sense.
  • it can be a fixed connection, a detachable connection, or an integral body.
  • It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interaction between two elements.
  • the specific meanings of the above terms in this application can be understood on a case-by-case basis.
  • the term “above” or “below” a first feature on a second feature may include direct contact between the first and second features, or may also include the first and second features. Not in direct contact but through additional characteristic contact between them.
  • the terms “above”, “above” and “above” a first feature on a second feature include the first feature being directly above and diagonally above the second feature, or simply mean that the first feature is higher in level than the second feature.
  • “Below”, “under” and “under” the first feature is the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature is less horizontally than the second feature.
  • this embodiment provides a roll groove sealed battery core.
  • the roll groove sealed battery core includes a housing 100, a cover plate 200 and a sealing ring 300.
  • One end of the housing 100 has an opening.
  • the cover 200 is fastened to the opening of the casing 100 and is connected to the casing 100 through rolling groove sealing.
  • the cover 200 includes a fixed part 210, a first protruding part 220 and a recessed part 230 that are connected to each other, wherein, The fixing part 210 and the first protruding part 220 are annular, the recessed part 230 is circular, the inner ring of the first protruding part 220 is connected to the outer edge of the recessed part 230, and the inner ring of the fixing part 210 is connected to the first protruding part 220.
  • the outer ring of the fixing part 210 is connected to the housing 100. Due to the characteristics of the rolling groove sealing process, the compressive stress on the outer edge of the cover plate 200 is greater than the compressive stress on the center position.
  • the arrangement of the first protruding portion 220 and the recessed portion 230 can improve the ability of the cover plate 200 to resist compressive stress and ensure good sealing performance. At the same time, the first protruding portion 220 and the recessed portion 230 can absorb minor deformations of the cover plate 200 and prevent the cover plate 200 from being deformed.
  • the surface protrudes from the edge of the opening of the housing 100, resulting in a short circuit or poor connection.
  • the sealing ring 300 is provided between the housing 100 and the fixed part 210.
  • the lower end surface of the fixed part 210 is provided with an annular limiting groove 2101 to seal.
  • the ring 300 is provided with an annular protrusion 310 at a position corresponding to the annular limit groove 2101.
  • the annular protrusion 310 is clamped in the annular limit groove 2101.
  • the annular protrusion 310 can be used as a sealing compression point between the housing 100 and the cover plate 200. It plays a position limiting role during sealing to prevent the position of the sealing ring 300 and the cover plate 200 from shifting, ensuring accurate positioning, uniform circumferential stress on the cover plate 200, and maintaining the upper and lower stress points of the cover plate 200 Consistent, reliable sealing, avoiding liquid leakage, and good safety performance.
  • the depth of the annular limiting groove 2101 is smaller than the height of the annular protrusion 310, so that the sealing compression point of the sealing ring 300 can be pressed against the cover plate 200 to ensure the reliability of the sealing.
  • the height difference between the annular limiting groove 2101 and the annular protrusion 310 is 0.2 mm to 0.6 mm.
  • the height difference between the annular limiting groove 2101 and the annular protrusion 310 may be set to 0.2mm, 0.3mm, 0.4mm, 0.5mm or 0.6mm.
  • the height difference between the annular limiting groove 2101 and the annular protrusion 310 can also be other values within this range, which is not limited in this embodiment.
  • the first protruding portion 220 of the roll-grooved battery core in this embodiment is provided with a circular notch 2201 .
  • the circular notch 2201 breaks to release the pressure inside the casing 100 and control the trend of heat spread.
  • the circular notch 2201 serves as a pressure relief structure for the roll groove sealed battery core, which can avoid the risk of explosion of the roll groove sealed battery core.
  • the diameter of the cover plate 200 is 38 mm ⁇ 45 mm
  • the thickness of the cover plate 200 is 0.3 mm ⁇ 2.0 mm
  • the thickness of the sealing ring 300 is 0.5 mm ⁇ 1.5 mm
  • the diameter of the circular notch 2201 is It is 20mm ⁇ 30mm. The specific value can be determined according to the actual situation and will not be repeated here.
  • the recessed portion 230 is provided with a second protruding portion 240 , the second protruding portion 240 is annular, and the highest point of the second protruding portion 240 is lower than the first protruding portion.
  • the highest point of the origin is 220.
  • This embodiment also provides a battery module, including the above-mentioned roll groove sealed battery core.
  • a battery module including the above-mentioned roll groove sealed battery core.
  • This embodiment provides a roll groove sealed battery core.
  • the difference between the roll groove sealed battery core in the second embodiment and the roll groove sealed battery core in the first embodiment is that: the roll groove sealed battery core in this embodiment
  • the first protruding portion 220 of the core is provided with a C-shaped notch 2202 and a connecting portion 2203, and the C-shaped notch 2202 and the connecting portion 2203 form a circle.
  • the C-shaped notch 2202 breaks and flips around the connection part 2203, thereby releasing the pressure inside the casing 100 and controlling the The trend of heat spreading.
  • the C-shaped notch 2202 serves as a pressure relief structure for the roll groove sealed battery core, which can avoid the risk of explosion of the roll groove sealed battery core.
  • a pressure relief structure can be realized. directional opening, and the cover 200 will not fly out after the pressure relief structure is opened, ensuring the safety of users.
  • the diameter of the circle is 20 mm to 30 mm.
  • the specific value can be determined according to the actual situation, and will not be described again here.
  • the central angle ⁇ corresponding to the connecting part 2203 is 5°-20°, thereby ensuring that the connecting part 2203 has sufficient connection strength. After the C-shaped notch 2202 is broken, the connecting part 2203 will not break. break, thereby ensuring that the inside of the C-shaped notch 2202 of the cover 200 will not fly out after being flipped over, thereby ensuring the safety of users.
  • the central angle ⁇ corresponding to the connecting portion 2203 is 5°, 10°, 15° or 20°, which can be specifically selected according to the thickness of the cover plate 200, which is not limited in this embodiment.
  • the central angle ⁇ corresponding to the connecting portion 2203 can also be selected to have other values within this range, which will not be described again here.
  • This embodiment also provides a battery module, including the above-mentioned roll groove sealed battery cores.
  • the cover plate 200 is evenly stressed, is not prone to deformation, has reliable sealing, is not prone to leakage, and has good safety performance. .

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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)

Abstract

La présente demande divulgue un élément de batterie scellé par un processus de rainurage et d'étanchéité, ainsi qu'un module de batterie. Une plaque de recouvrement de l'élément de batterie, scellée par un processus de rainurage et d'étanchéité est encliquetée sur l'ouverture d'un boîtier ; la plaque de recouvrement comprend une partie fixation, une première partie en saillie et une partie en creux ; une bague d'étanchéité est disposée entre le boîtier et la plaque de recouvrement ; une fente de limitation annulaire est formée dans la surface d'extrémité inférieure de la partie fixation ; une saillie annulaire est disposée sur la bague d'étanchéité ; la saillie annulaire est serrée dans la fente de limitation annulaire.
PCT/CN2022/129988 2022-06-17 2022-11-04 Élément de batterie scellé par un processus de rainurage et d'étanchéité ainsi que module de batterie WO2023240904A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202221525016.0 2022-06-17
CN202221525016.0U CN217788479U (zh) 2022-06-17 2022-06-17 一种滚槽封口的电芯及电池模组

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WO2023240904A1 true WO2023240904A1 (fr) 2023-12-21

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PCT/CN2022/129988 WO2023240904A1 (fr) 2022-06-17 2022-11-04 Élément de batterie scellé par un processus de rainurage et d'étanchéité ainsi que module de batterie

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WO (1) WO2023240904A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN212277317U (zh) * 2020-08-31 2021-01-01 宁波市万恒电池配件有限公司 一种微型扣式电池密封与防爆结构
CN214336803U (zh) * 2020-11-24 2021-10-01 深圳市比克动力电池有限公司 圆柱电池帽盖及圆柱电池
CN215527884U (zh) * 2021-06-11 2022-01-14 深圳市合壹新能技术有限公司 用于纽扣电池的壳体结构及纽扣电池
CN215578775U (zh) * 2021-05-21 2022-01-18 湖北亿纬动力有限公司 一种新型结构的圆柱型电池
CN216250924U (zh) * 2021-05-21 2022-04-08 湖北亿纬动力有限公司 一种负极盖板和电池
CN216354464U (zh) * 2021-04-30 2022-04-19 蜂巢能源科技(无锡)有限公司 电池盖板组件和锂电池

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN212277317U (zh) * 2020-08-31 2021-01-01 宁波市万恒电池配件有限公司 一种微型扣式电池密封与防爆结构
CN214336803U (zh) * 2020-11-24 2021-10-01 深圳市比克动力电池有限公司 圆柱电池帽盖及圆柱电池
CN216354464U (zh) * 2021-04-30 2022-04-19 蜂巢能源科技(无锡)有限公司 电池盖板组件和锂电池
CN215578775U (zh) * 2021-05-21 2022-01-18 湖北亿纬动力有限公司 一种新型结构的圆柱型电池
CN216250924U (zh) * 2021-05-21 2022-04-08 湖北亿纬动力有限公司 一种负极盖板和电池
CN215527884U (zh) * 2021-06-11 2022-01-14 深圳市合壹新能技术有限公司 用于纽扣电池的壳体结构及纽扣电池

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