WO2023115961A1 - 电池盖板组件及圆柱电池 - Google Patents

电池盖板组件及圆柱电池 Download PDF

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Publication number
WO2023115961A1
WO2023115961A1 PCT/CN2022/109965 CN2022109965W WO2023115961A1 WO 2023115961 A1 WO2023115961 A1 WO 2023115961A1 CN 2022109965 W CN2022109965 W CN 2022109965W WO 2023115961 A1 WO2023115961 A1 WO 2023115961A1
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WO
WIPO (PCT)
Prior art keywords
top cover
insulator
battery
groove
pole
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Application number
PCT/CN2022/109965
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English (en)
French (fr)
Inventor
赵赫
赵芬芬
杨成
徐悦斌
何巍
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湖北亿纬动力有限公司
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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 WO2023115961A1 publication Critical patent/WO2023115961A1/zh

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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 of a single cell or a single battery
    • 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 of a single cell or a single battery
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • 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 technical field of cylindrical batteries, such as battery cover components and cylindrical batteries.
  • Cylindrical batteries usually include terminals, top cover sheet, upper plastic, lower plastic, pole, sealing ring and collector plate.
  • the method of assembling cylindrical batteries is usually to firstly fix the pole and the collector plate by ultrasonic welding, make the collector plate contact the lower plastic, and then connect the terminal and the top cover sheet through riveting process.
  • junction plate is ultrasonically welded to the pole, uneven welding marks are more likely to appear on the surface of the junction plate, resulting in a gap between the lower plastic and the junction plate after the contact between the lower plastic and the junction plate, resulting in cylindrical batteries.
  • the electrolyte is easier to seep into the pole along the gap between the collector plate and the lower plastic, which will cause the leakage of the cylindrical battery.
  • the present application provides a battery cover assembly and a cylindrical battery, which can prevent liquid leakage and have high reliability.
  • the present application provides a battery cover assembly, including:
  • a top cover body, the top cover body is integrally formed, and the top cover body includes a top cover part and a terminal part located on one side of the top cover part;
  • the current collector is located on the side of the top cover facing away from the terminal part.
  • the current collector is an integrally formed structure, and the current collector includes a current collector and is located at the current collector facing the top cover.
  • the pole part on one side of the pole part is fixed to the top cover part.
  • the present application provides a cylindrical battery, including a case, a cell, and the battery cover assembly as described above, and the cell is located in a space enclosed by the case and the battery cover assembly.
  • Fig. 1 is an exploded schematic diagram of a battery cover assembly provided by an embodiment of the present application
  • Fig. 2 is a schematic cross-sectional view of a part of the battery cover assembly provided by the embodiment of the present application;
  • Fig. 3 is the enlarged schematic diagram of place A shown in Fig. 2 of the present application;
  • Fig. 4 is an exploded schematic view of the battery cover assembly provided by the embodiment of the present application.
  • Fig. 5 is a schematic diagram of a cylindrical battery provided in an embodiment of the present application.
  • Top cover body 11. Top cover part; 111. Melting tank; 12. Terminal part; 121. First groove; 13. Liquid injection hole;
  • connection should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or integrated; it can be a mechanical connection, or a Electrical connection; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components.
  • connection can be a fixed connection, or a detachable connection, or integrated; it can be a mechanical connection, or a Electrical connection; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components.
  • a first feature being "on” or “under” a second feature may include that the first and second features are in direct contact, and may also include that the first and second features are not in direct contact but pass between them. additional feature contacts.
  • “above”, “above” and “above” the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.
  • “Below”, “beneath” and “under” the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.
  • This embodiment provides a battery cover assembly, which can prevent liquid leakage and has high reliability.
  • the battery cover assembly is applied to the cylindrical battery, so that the cylindrical battery will not leak. It can be understood that the function of the battery cover assembly is to seal the shell of the cylindrical battery cell.
  • the battery cover assembly includes a top cover body 1 and a current collector 2 .
  • Both the top cover body 1 and the current collector 2 are integrally formed, that is, the top cover body 1 can be formed in one manufacturing process, and the current collector 2 can also be formed in one manufacturing process.
  • the top cover body 1 is formed by stamping a sheet, and the current collector 2 may also be formed by stamping a sheet.
  • the top cover body 1 includes a top cover portion 11 and a terminal portion 12 located on one side of the top cover portion 11 , and the extension direction of the terminal portion 12 is perpendicular to the direction of the top cover portion 11. top surface.
  • the top cover portion 11 has a circular shape, and the terminal portion 12 is disposed at the center of the top cover portion 11 .
  • the profile of the terminal portion 12 can be set according to actual needs, for example, the terminal portion 12 is in the shape of a cylinder, a prism, a cone, or a pyramid.
  • the top cover body 1 is integrally formed so that there is no connecting gap between the terminal part 12 and the top cover part 11 . It can be understood that the terminal portion 12 or the top cover portion 11 in this embodiment can be used for electrical connection with external devices.
  • the current collector 2 is located on the side of the top cover 11 facing away from the terminal 12 , that is, the terminal 12 and the current collector 2 are respectively located on both sides of the top cover 11 .
  • the current collector 2 includes a collector part 21 and a pole part 22 located on the side of the collector part 21 facing the top cover part 11.
  • the pole part 22 extends toward the top cover part 11 and is affixed to the top cover part 11, thereby realizing a current collector. 2 and the connection between the top cover body 1.
  • the materials of the top cover body 1 and the current collector 2 in this embodiment are both conductive materials, and the fixed connection between the pole part 22 and the top cover part 11 can realize the electrical connection between the top cover body 1 and the current collector 2. connect.
  • the current collector 2 is integrally formed so that there is no connection gap between the current collector 21 and the pole part 22 .
  • the connection method between the pole portion 22 and the top cover portion 11 may be welding, such as connecting the pole portion 22 and the top cover portion 11 by laser welding or ultrasonic welding, so as to realize the electrical connection between the two. It should be noted that, when the battery cover assembly in this embodiment is in use, both the pole part 22 and the top cover part 11 are charged, that is, both the top cover body 1 and the current collector 2 are charged.
  • the top cover body 1, the current collector 2, and the shell of the cylindrical battery are all charged, and the negative electrode of the cylindrical battery is treated so that the negative electrode is not charged, thereby preventing the short circuit of the cylindrical battery .
  • the structure of the current collector 21 can be set according to actual needs.
  • the current collector 21 includes a strip-shaped first current collector and a square second current collector.
  • the pole part 22 Set on the first current collector part.
  • the pole portion 22 may be in the shape of a cylinder, a prism, a cone or a prism, and the like.
  • the terminal portion 12 in this embodiment can be used for electrical connection with external devices.
  • the current collecting part 21 or the pole part 22 can be used to connect the electric core.
  • the current collecting part 21 or the pole part 22 can be connected to the tab on the core pack through the connector, and the external power transmission equipment is connected to the pole part 22 through the top cover part 11 or the terminal part 12 to realize the power transmission of the battery .
  • the current collector 2 is integrally formed, so that there is no connection gap between the current collecting portion 21 and the pole portion 22, and the top cover body 1 is integrally formed, so that the top cover There is no connection gap between the portion 11 and the terminal portion 12 .
  • the top cover body 1 and the current collector 2 are both provided with an integrated structure, which can prevent the electrolyte from passing through the battery cover plate assembly, thereby preventing the problem of liquid leakage , improving the quality and reliability of the battery cover assembly.
  • the battery cover assembly further includes an insulator 3 .
  • the insulator 3 is disposed between the top cover portion 11 and the current collecting portion 21 .
  • the insulator 3 is used to isolate the top cover part 11 and the current collecting part 21, so as to ensure that the current collecting part 21 will not be in contact with the top cover part 11 for a second time after fusing, and can also compress the battery cell of the cylindrical battery so that the battery cell is in the cylindrical battery. There is no shaking in the housing.
  • the insulator 3 has a pole hole 31 for the pole portion 22 to pass through, and the pole portion 22 can pass through the pole hole 31 and be fixed to the top cover portion 11 .
  • the shape of the pole hole 31 can match the shape of the pole part 22, and the size of the pole hole 31 can match the size of the pole part 22, so that the insulator 3 can be realized through the pole hole 31. Limitation of pole part 22.
  • the insulator 3 is also provided with a fuse avoidance hole 32, the fuse avoidance hole 32 runs through the upper and lower sides of the insulator 3, and the setting of the fuse avoidance hole 32 prevents the high temperature of the cylindrical battery from melting the insulator 3, so that the secondary adhesion will not occur after the cylindrical battery is fused.
  • the material of the insulator 3 may be a high temperature resistant insulating material such as polyimide.
  • the outline of the insulator 3 is circular, and the fusing escape hole 32 is disposed at the geometric center of the insulator 3 . It should be noted that the insulator 3 in this embodiment can be the lower plastic in the related art, and the lower plastic and the insulator 3 have the same function.
  • the side of the insulator 3 facing away from the top cover part 11 is provided with a mounting groove 33, and the mounting groove 33 is provided with a limiting member 34.
  • the limiting member 34 is located at the end of the mounting groove 33
  • One end of the collecting portion 21 is installed in the mounting groove 33 on the side wall of the groove, and is positioned by a stopper 34 to prevent the collecting portion 21 from moving relative to the insulator 3 .
  • the first current collector part is locked in the installation groove 33 .
  • the installation groove 33 has three groove sidewalls, so that the first collector part can be inserted into the installation groove 33 from one end of the installation groove 33 .
  • the limiting member 34 may be a protrusion provided on the wall of the installation groove 33 .
  • the insulator 3 is welded on the top cover part 11 by thermocompression welding.
  • the surface of the top cover 11 facing the insulator 3 has a melting groove 111
  • the surface of the insulator 3 facing the top cover 11 is provided with a connecting block 35
  • the connecting block 35 can be placed in the melting tank. slot 111.
  • the connection block 35 is melted under the action of hot pressure to flow into the melting tank 111 and seal the melting tank 111 , and can connect the insulator 3 and the top cover 11 after cooling.
  • the cross-sectional area of the melting tank 111 is smaller than that of the connecting block 35 , so that the connecting block 35 has enough liquid to fill in the melting tank 111 after melting.
  • the size of the melting tank 111 in the thickness direction of the top cover part 11 is less than 60% of the thickness of the top cover part 11 to ensure sealing.
  • multiple melting tanks 111 and connecting blocks 35 can be provided, and multiple melting tanks 111 correspond to multiple connecting blocks 35 one by one, and the connecting blocks 35 Can be placed in the melting tank 111 corresponding thereto.
  • the terminal portion 12 has a first groove 121 facing the collector portion 21 , and the first groove 121 can be formed during the punching process.
  • the first groove 121 forms a fusing avoidance area to prevent secondary adhesion of the cylindrical battery after fusing.
  • the fusing avoidance area can be understood as that when the confluence plate is fusing, because of the design of the position and structure of the fusing avoidance area, the fusing confluence plate will have sufficient space to realize separation, so as to avoid the secondary failure of the fusing confluence plate due to insufficient space. Adhesion.
  • the first groove 121 is opposite to the fusing escape hole 32 in the thickness direction of the top cover body 1 to ensure that the insulator 3 will not be melted.
  • the current collecting part 21 is provided with a fusing structure, and the fusing structure is configured to fuse the current collecting part 21 when the cylindrical battery is short-circuited, thereby disconnecting the circuit and preventing the cylindrical battery from overheating.
  • the pole part 22 has a second groove 221 facing away from the top cover part 11 , and the second groove 221 can be formed during the punching process.
  • a side of the pole part 22 facing away from the top cover part 11 is provided with a second groove 221 facing the top cover part 11 , that is, the second groove 221 is recessed toward the top cover part 11 .
  • the setting of the second groove 221 makes the pole part 22 a hollow structure.
  • the pole part 22 of the idle structure has a smaller weight, thereby making the battery cover assembly and the cylindrical battery The weight can be small, which is convenient for the lightweight of the cylindrical battery.
  • a liquid injection hole 13 is opened on the top cover body 1 , and the electrolyte solution can be injected into the cylindrical battery through the liquid injection hole 13 . It should be noted that when the battery cover assembly is installed on the casing of the cylindrical battery, it is bent to expose the liquid injection hole 13 .
  • the number of structural parts is reduced from 7 in the related art (respectively, terminals, top cover sheet, upper plastic, lower plastic, pole, sealing ring and collector plate) to 3 ( They are respectively the top cover body 1, the current collector 2 and the insulator 3), while simplifying the processing procedure and reducing the cost of the battery cover plate assembly, it also eliminates the risk of liquid leakage.
  • the setting of the fusing avoidance hole 32 and the fusing avoiding area can meet the functional requirements of the battery cover assembly and reduce the probability of secondary adhesion after fusing.
  • this embodiment also provides a cylindrical battery, which includes the above-mentioned battery cover assembly 6 .
  • the cylindrical battery provided in this embodiment can prevent liquid leakage, has high reliability, and is easy to assemble and process. It can be understood that the cylindrical battery may also include a casing 5 , a cell 4 , etc., and the cell 4 is located in the space enclosed by the casing 5 and the battery cover assembly 6 .

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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)

Abstract

本申请公开了一种电池盖板组件及圆柱电池，其属于圆柱电池技术领域，电池盖板组件包括顶盖体及集流体，所述顶盖体为一体成型结构，且所述顶盖体包括顶盖部及位于所述顶盖部一侧的端子部；集流体位于背向所述端子部的所述顶盖部的一侧，所述集流体为一体成型结构，且所述集流体包括集流部及位于所述集流部朝向所述顶盖部一侧的极柱部，所述极柱部固接于所述顶盖部。

Description

电池盖板组件及圆柱电池
本申请要求在2021年12月20日提交中国专利局、申请号为202123210254.0的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及圆柱电池技术领域，例如电池盖板组件及圆柱电池。
背景技术
随着新能源技术的发展，对圆柱电池性能的要求越来越高。圆柱电池通常包括端子、顶盖片、上塑胶、下塑胶、极柱、密封圈及集流盘。
相关技术中，组装圆柱电池的方式通常为，先将极柱和汇流盘采用超声焊接固定，并使汇流盘与下塑胶接触，然后通过铆接工艺连接端子与顶盖片。
但是，汇流盘在与极柱超声焊接后，在汇流盘的表面较容易出现凹凸不平的焊印，导致下塑胶与汇流盘接触后，下塑胶与汇流盘之间仍存在缝隙，从而导致圆柱电池的电解液较容易沿着汇流盘与下塑胶之间的缝隙渗透至极柱处，进而导致圆柱电池出现漏液的问题。
发明内容
本申请提供一种电池盖板组件及圆柱电池，能够防止出现漏液的问题，具有较高的可靠性。
一方面，本申请提供一种电池盖板组件，包括：
顶盖体，所述顶盖体为一体成型结构，且所述顶盖体包括顶盖部及位于所述顶盖部一侧的端子部；
集流体，位于背向所述端子部的所述顶盖部的一侧，所述集流体为一体成型结构，且所述集流体包括集流部及位于所述集流部朝向所述顶盖部一侧的极柱部，所述极柱部固接于所述顶盖部。
另一方面，本申请提供一种圆柱电池，包括壳体、电芯、以及如上所述的电池盖板组件，所述电芯位于所述壳体和电池盖板组件围成的空间内。
附图说明
图1是本申请实施例提供的电池盖板组件的分解示意图；
图2是本申请实施例提供的部分电池盖板组件的截面示意图；
图3是本申请图2所示的A处放大示意图；
图4是本申请实施例提供的电池盖板组件的分解示意图；
图5是本申请实施例提供的圆柱电池的示意图。
图中：
1、顶盖体；11、顶盖部；111、熔槽；12、端子部；121、第一凹槽；13、注液孔；
2、集流体；21、集流部；22、极柱部；221、第二凹槽；
3、绝缘体；31、极柱孔；32、熔断避让孔；33、安装槽；34、限位件；35、连接块；
4、壳体；5、电芯；6、电池盖板组件。
具体实施方式
下面结合附图并通过实施方式来说明本申请。为了便于描述，附图中仅示出了与本申请相关的部分而非全部。
在本申请的描述中，术语“相连”、“连接”、“固定”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；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或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据实际情况理解上述术语在本申请中的含义。
在本申请中，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本实施例的描述中，术语“上”、“下”、“右”、等方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述和简化操作，而不是指示或暗示所指的装置或元件具有特定的方位、以特定的方位构造和操作。此外，术语“第一”、“第二”仅仅用于在描述上加以区分，并没有特殊的含义。
本实施例提供了一种电池盖板组件，能够防止出现漏液的问题，具有较高 的可靠性。电池盖板组件应用于圆柱电池中，进而使得圆柱电池也不会出现漏液的情况。可以理解的是，电池盖板组件的作用在于对圆柱电池电芯的外壳进行密封。
如图1所示，电池盖板组件包括顶盖体1和集流体2。顶盖体1和集流体2均为一体成型结构，也即是，顶盖体1能够在一次制造工艺中形成，集流体2也能够在一次制造工艺中形成。在一实施例中，顶盖体1采用板材冲压的方式形成，集流体2也可以采用板材冲压的方式形成。
在一实施例中，如图1和图2所示，顶盖体1包括顶盖部11及位于顶盖部11一侧的端子部12，端子部12的延伸方向垂直于顶盖部11的顶面。在一实施例中，顶盖部11的外形轮廓呈圆形，端子部12设置在顶盖部11的中心位置。可选地，端子部12的外形轮廓可以根据实际需要进行设置，如端子部12呈圆柱形、棱柱形、圆台形或棱台形等。顶盖体1为一体成型结构，使得端子部12与顶盖部11之间不存在连接缝隙。可以理解的是，本实施例中的端子部12或顶盖部11可以用于与外部设备进行电连接。
参见图1或图2，集流体2位于背向端子部12的顶盖部11的一侧，也即是，端子部12与集流体2分别位于顶盖部11的两侧。集流体2包括集流部21及位于集流部21朝向顶盖部11一侧的极柱部22，极柱部22朝向顶盖部11延伸并固接于顶盖部11，进而实现集流体2与顶盖体1之间的连接。可以理解的是，本实施例中的顶盖体1的材质及集流体2的材质均为导电材质，极柱部22与顶盖部11固接能够实现顶盖体1与集流体2的电连接。集流体2为一体成型结构，使得集流部21和极柱部22之间不存在连接缝隙。可选地，极柱部22与顶盖部11之间的连接方式可以为焊接，如通过激光焊或超声焊的方式连接极柱部22与顶盖部11，进而实现两者的电连接。需要说明的是，本实施例中的电池盖板组件在使用时，极柱部22和顶盖部11均带电，也即是，顶盖体1与集流体2均带电。当电池盖板组件应用在圆柱电池中时，顶盖体1、集流体2及圆柱电池的壳体均带电，并通过对圆柱电池的负极进行处理，以使负极不带电，从而防止圆柱电池短路。
本实施例中，集流部21的结构可以根据实际需要进行设置，例如，集流部21包括呈条形的第一集流子部和呈方形的第二集流子部，极柱部22设置于第一集流子部上。极柱部22可以呈圆柱形、棱柱形、圆台形或棱台形等。可以理解的是，本实施例中的端子部12可以用于与外部设备进行电连接。集流部21或极柱部22可以用于连接电芯。可选地，集流部21或极柱部22可以通过连接件与芯包上的极耳连接，外部输电设备通过顶盖部11或端子部12与极柱部22连接，实现电池的电能输送。
本实施例提供的电池盖板组件中，集流体2为一体成型结构，使得集流部21和极柱部22之间不存在连接缝隙，并且，顶盖体1为一体成型结构，使得顶盖部11和端子部12之间不存在连接缝隙。相较于相关技术中的铆接及焊接，本实施例中，顶盖体1和集流体2均设置为一体成型结构，能够防止电解液穿过电池盖板组件，进而能够防止出现漏液的问题，提高了电池盖板组件的质量及可靠性。
相较于相关技术中的电池顶盖组件，本实施例中，通过将集流体2和顶盖体1均设置为一体成型结构，无需设置上塑胶和密封圈，使得电池盖板组件的结构件数量可以较少，大大简化了电池盖板组件的加工工序及组装工序。
可选地，请继续参见图1，电池盖板组件还包括绝缘体3。其中，绝缘体3设于顶盖部11与集流部21之间。绝缘体3用于隔离顶盖部11与集流部21，以保证熔断后集流部21不会和顶盖部11二次接触，还能够压紧圆柱电池的电芯，使得电芯在圆柱电池的壳体内不发生晃动。
如图1所示，绝缘体3具有用于供极柱部22穿设的极柱孔31，极柱部22可以穿过极柱孔31并固接于顶盖部11。在一实施例中，极柱孔31的形状可以与极柱部22的形状相匹配，极柱孔31的大小可以与极柱部22的大小相匹配，以使得绝缘体3通过极柱孔31实现对极柱部22的限位。
可选地，请继续参见图1，绝缘体3上还设有熔断避让孔32，熔断避让孔32贯穿绝缘体3的上下两侧，熔断避让孔32的设置使得圆柱电池短路下的高温不会熔化绝缘体3，进而使得圆柱电池熔断后不会发生二次粘连。在一实施例中，绝缘体3的材料可以是聚酰亚胺等耐高温绝缘材料。在一实施例中，绝缘体3的外形轮廓呈圆形，熔断避让孔32设置于绝缘体3的几何中心处。需要说明的是，本实施例中的绝缘体3可以为相关技术中的下塑胶，下塑胶和绝缘体3具有相同的作用。
如图2和图3所示，绝缘体3背向顶盖部11的一侧设有安装槽33，安装槽33上设有限位件34，可选地，限位件34设于安装槽33的槽侧壁，集流部21的一端安装于安装槽33中，并由限位件34定位，以防止集流部21相对于绝缘体3移动。可选地，第一集流子部卡在安装槽33中。本实施例中，安装槽33具有三个槽侧壁，以便于第一集流子部由安装槽33的一端插入安装槽33中。可选地，限位件34可以为设置在安装槽33槽壁的凸块。
可选地，绝缘体3采用热压焊接的方式焊接在顶盖部11上。在一实施例中，如图1和4所示，顶盖部11朝向绝缘体3的表面具有熔槽111，绝缘体3朝向顶盖部11的表面设有连接块35，连接块35能置于熔槽111中。例如，连接块35在热压的作用下熔融，以流入熔槽111中并封堵熔槽111，冷却后能够连接 绝缘体3及顶盖部11。在一实施例中，熔槽111的截面积小于连接块35的截面积，使得连接块35熔融后具有足量的液体填充在熔槽111中。本实施例中，熔槽111在顶盖部11厚度方向上的尺寸小于顶盖部11厚度的60％，以保证密封。
可选地，为了提高绝缘体3与顶盖部11的连接效果，熔槽111和连接块35均可设有多个，多个熔槽111与多个连接块35一一对应，且连接块35能置于与其对应的熔槽111中。
可选地，如图2所示，端子部12具有朝向集流部21的第一凹槽121，该第一凹槽121可以在冲压的过程中形成。第一凹槽121形成熔断避让区，以防止圆柱电池熔断后出现二次粘连的问题。熔断避让区可以理解为，汇流盘熔断时，因为有熔断避让区位置结构设计，会使得熔断后的汇流盘有充分的空间实现分离，从而避免因为空间不够的因素导致熔断后的汇流盘二次粘连。本实施例中，第一凹槽121在顶盖体1厚度方向上与熔断避让孔32相对，以保证绝缘体3不会被熔化。
本实施例中，集流部21上设有熔断结构，熔断结构被配置为圆柱电池发生短路时熔断集流部21，进而断开电路，避免圆柱电池的温度过高。
可选地，如图2所示，极柱部22具有背向顶盖部11的第二凹槽221，第二凹槽221可以在冲压的过程中形成。极柱部22背向顶盖部11的一侧设有朝向顶盖部11的第二凹槽221，也即是，第二凹槽221是朝向顶盖部11凹入的。第二凹槽221的设置使得极柱部22为空心结构，相较于实心结构的极柱部22，空闲结构的极柱部22具有较小的重量，进而使得电池盖板组件及圆柱电池的重量可以较小，便于圆柱电池的轻量化。
如图3所示，顶盖体1上还开设有注液孔13，通过注液孔13能够向圆柱电池内注入电解液。需要说明的是，电池盖板组件安装在圆柱电池的壳体上时，进行弯折，可以露出注液孔13。
本实施例提供的电池盖板组件，结构件数量由相关技术中的7个(分别为端子、顶盖片、上塑胶、下塑胶、极柱、密封圈及集流盘)降低至3个(分别为顶盖体1、集流体2和绝缘体3)，在简化加工工序、降低电池盖板组件成本的同时，还杜绝了漏液的风险。并且，熔断避让孔32及熔断避让区的设置，能够满足电池盖板组件功能要求，并降低了熔断后二次粘连的几率。
如图5所示，本实施例还提供了一种圆柱电池，圆柱电池包括上述的电池盖板组件6。本实施例提供的圆柱电池能够防止出现漏液的问题，具有较高的可靠性，且便于组装与加工。可以理解的是，圆柱电池还可以包括壳体5、电芯4等，电芯4位于壳体5和电池盖板组件6围成的空间内。

Claims (20)

  1. 一种电池盖板组件，包括：
    顶盖体(1)，所述顶盖体(1)为一体成型结构，且所述顶盖体(1)包括顶盖部(11)及位于所述顶盖部(11)一侧的端子部(12)；
    集流体(2)，位于背向所述端子部(12)的所述顶盖部(11)的一侧，所述集流体(2)为一体成型结构，且所述集流体(2)包括集流部(21)及位于所述集流部(21)朝向所述顶盖部(11)一侧的极柱部(22)，所述极柱部(22)固接于所述顶盖部(11)。
  2. 根据权利要求1所述的电池盖板组件，还包括绝缘体(3)，所述绝缘体(3)设于所述顶盖部(11)与所述集流部(21)之间，且所述绝缘体(3)具有极柱孔(31)，所述极柱部(22)穿过所述极柱孔(31)并固接于所述顶盖部(11)。
  3. 根据权利要求2所述的电池盖板组件，其中，所述绝缘体(3)上还设有熔断避让孔(32)。
  4. 根据权利要求2所述的电池盖板组件，其中，所述绝缘体(3)背向所述顶盖部(11)的一侧设有安装槽(33)，所述安装槽(33)上设有限位件(34)，所述集流部(21)的一端安装于所述安装槽(33)中，并由所述限位件(34)定位。
  5. 根据权利要求2所述的电池盖板组件，其中，所述顶盖部(11)朝向所述绝缘体(3)的表面具有熔槽(111)，所述绝缘体(3)朝向所述顶盖部(11)的表面设有连接块(35)，所述连接块(35)能置于所述熔槽(111)中，以连接所述绝缘体(3)及所述顶盖部(11)。
  6. 根据权利要求1所述的电池盖板组件，其中，所述端子部(12)具有朝向所述集流部(21)的第一凹槽(121)，所述第一凹槽(121)形成熔断避让区。
  7. 根据权利要求2所述的电池盖板组件，其中，所述端子部(12)具有朝向所述集流部(21)的第一凹槽(121)，所述第一凹槽(121)形成熔断避让区。
  8. 根据权利要求1所述的电池盖板组件，其中，所述集流部(21)上设有熔断结构。
  9. 根据权利要求1所述的电池盖板组件，其中，所述极柱部(22)背向所述顶盖部(11)的一侧设有朝向所述顶盖部(11)的第二凹槽(221)。
  10. 根据权利要求1所述的电池盖板组件，其中，所述极柱部(22)背向所述顶盖部(11)的一侧设有朝向所述顶盖部(11)的第二凹槽(221)。
  11. 根据权利要求1所述的电池盖板组件，其中，所述极柱部(22)与所述 顶盖部(11)焊接。
  12. 一种圆柱电池，包括壳体(5)、电芯(4)、以及如权利要求1所述的电池盖板组件，所述电芯(4)位于所述壳体(5)和电池盖板组件围成的空间内。
  13. 根据权利要求12所述的圆柱电池，其中，所述电池盖板组件包括绝缘体(3)，所述绝缘体(3)设于所述顶盖部(11)与所述集流部(21)之间，且所述绝缘体(3)具有极柱孔(31)，所述极柱部(22)穿过所述极柱孔(31)并固接于所述顶盖部(11)。
  14. 根据权利要求13所述的圆柱电池，其中，所述绝缘体(3)上还设有熔断避让孔(32)。
  15. 根据权利要求13所述的圆柱电池，其中，所述绝缘体(3)背向所述顶盖部(11)的一侧设有安装槽(33)，所述安装槽(33)上设有限位件(34)，所述集流部(21)的一端安装于所述安装槽(33)中，并由所述限位件(34)定位。
  16. 根据权利要求13所述的圆柱电池，其中，所述顶盖部(11)朝向所述绝缘体(3)的表面具有熔槽(111)，所述绝缘体(3)朝向所述顶盖部(11)的表面设有连接块(35)，所述连接块(35)能置于所述熔槽(111)中，以连接所述绝缘体(3)及所述顶盖部(11)。
  17. 根据权利要求12所述的圆柱电池，其中，所述端子部(12)具有朝向所述集流部(21)的第一凹槽(121)，所述第一凹槽(121)形成熔断避让区。
  18. 根据权利要求12所述的圆柱电池，其中，所述集流部(21)上设有熔断结构。
  19. 根据权利要求12所述的圆柱电池，其中，所述极柱部(22)背向所述顶盖部(11)的一侧设有朝向所述顶盖部(11)的第二凹槽(221)。
  20. 根据权利要求12所述的圆柱电池，其中，所述极柱部(22)与所述顶盖部(11)焊接。
PCT/CN2022/109965 2021-12-20 2022-08-03 电池盖板组件及圆柱电池 WO2023115961A1 (zh)

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