WO2023142536A1 - 电池连接片、电池模组及电池包 - Google Patents

电池连接片、电池模组及电池包 Download PDF

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Publication number
WO2023142536A1
WO2023142536A1 PCT/CN2022/125240 CN2022125240W WO2023142536A1 WO 2023142536 A1 WO2023142536 A1 WO 2023142536A1 CN 2022125240 W CN2022125240 W CN 2022125240W WO 2023142536 A1 WO2023142536 A1 WO 2023142536A1
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Prior art keywords
battery
connection area
buffer section
connection
negative electrode
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PCT/CN2022/125240
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English (en)
French (fr)
Inventor
张国江
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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
Priority to EP22829536.6A priority Critical patent/EP4243187A1/en
Priority to US18/091,405 priority patent/US20230238659A1/en
Publication of WO2023142536A1 publication Critical patent/WO2023142536A1/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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • 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
    • 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 batteries, for example, to a battery connecting piece, a battery module and a battery pack.
  • a battery module is usually composed of multiple single cells connected in series and in parallel.
  • the connection of batteries in series and in parallel is not only related to the assembly efficiency of the battery module, but also has an impact on the main technical performance, service life and safety of the battery module. Influence.
  • the series and parallel connections between single cells are usually welded together with metal strips to the positive and negative electrodes of the single cells in the parallel battery module.
  • the single cells will shake. , resulting in tension or pressure on the metal straps connecting the single cells. Long-term use will cause the metal straps to wrinkle or even break. The breakage of the metal straps will cause the circuit to be cut off, affecting the normal operation of the battery module.
  • the present application provides a battery connecting piece, which can realize the series connection and parallel connection of the battery cells in the battery module, and reduce the risk of the battery connecting piece breaking.
  • the present application provides a battery connecting piece, including a plurality of conductive units,
  • the conductive unit includes a positive connection area, a negative connection area, and a first buffer section arranged between the positive connection area and the negative connection area, the positive connection area is electrically connected to the positive electrode of the cell, and the negative connection area is connected to the electrical
  • the negative electrodes of the cores are electrically connected, and the adjacent conductive units are electrically connected through connecting pieces.
  • the present application provides a battery module, which includes a plurality of battery cells and a plurality of the above-mentioned battery connection pieces, the above-mentioned positive electrode connection area is electrically connected to the positive electrode of the above-mentioned battery cell, and the above-mentioned negative electrode connection area is connected to the above-mentioned battery cell. Negative electrical connection.
  • the present application provides a battery pack, including the above-mentioned battery module.
  • Fig. 1 is a structural schematic diagram 1 of the battery connecting sheet provided by the present application.
  • Fig. 2 is a structural schematic diagram II of the battery connecting piece provided by the present application.
  • Fig. 3 is a partial enlarged view at A in Fig. 1 .
  • Conductive unit 110. Positive connection area; 120. Negative connection area; 121. Arc-shaped gap; 130. First buffer section; 131. Top wall; 132. Side wall; 200. Connector; 210. Second buffer segment.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection 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, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection 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 direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them.
  • “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.
  • the present application provides a battery connecting piece, which can realize the series and parallel connection of battery cells, alleviate the impact, reduce the risk of breaking the battery connecting piece, and improve the reliability of the battery connecting piece.
  • the battery connection sheet includes several conductive units 100, wherein the conductive unit 100 includes a positive electrode connection area 110, a negative electrode connection area 120 and a first buffer section 130, and the positive electrode connection area 110 is connected to the negative electrode.
  • the area 120 is respectively used to connect the positive pole and the negative pole of two adjacent battery cells
  • the first buffer section 130 is arranged between the positive pole connecting area 110 and the negative pole connecting area 120, and is used for buffering the tolerance between the positive pole and the negative pole of the battery core, and the phase Adjacent conductive units 100 are electrically connected through connecting pieces 200 .
  • connection between the cells can be realized.
  • the parallel connection between the cells can be realized by setting the connector 200 to electrically connect the adjacent conductive units 100 .
  • the first buffer section 130 between the positive electrode connection area 110 and the negative electrode connection area 120 on the one hand, it can have a certain buffering effect on the expansion force, tolerance and displacement between the cells, avoiding the breakage of the battery connection piece, and improving the battery life.
  • the reliability of the connecting piece on the other hand, it can ensure the reliability of the connection between the battery cell and the battery connecting piece.
  • a second buffer end 210 can also be provided on the connector 200.
  • the second buffer section 210 can buffer the expansion force, tolerance and displacement between adjacent batteries to avoid Fracture improves the reliability of the battery connecting piece; on the other hand, it can ensure the reliability of the connection between the battery cell and the battery connecting piece.
  • the positive electrode connection area 110 and the positive electrode of the battery cell can be electrically connected by welding, and the negative electrode connection area 120 and the negative electrode of the battery cell can also be connected by welding.
  • the buffer section 130 and the second buffer section 210 can play a certain buffering role when the positive connection area 110 and the negative connection area 120 of the same conductive unit 100 are respectively welded to two adjacent cells, so that the positive connection area can be avoided. False welding occurs between 110 and the positive pole of the battery cell and between the negative electrode connection area 120 and the negative pole of the battery cell, which improves the connection strength between the battery connection sheet and the battery cell, thereby improving the reliability of the battery connection sheet.
  • the positive connection area 110 and the negative connection area 120 can be raised upwards or downwards, and the gap between the positive connection area 110 and the positive pole of the cell and between the negative connection area 120 and the negative pole of the cell They can also be connected in other ways, and can be set according to actual needs.
  • the first buffer section 130 may be configured as a raised structure, for example, the first buffer section 130 may be configured as a figure-shaped structure.
  • the first buffer section 130 may also be a Z-shaped structure.
  • the first buffer section 130 may also have a wave-shaped structure, which can be selected according to actual needs.
  • the second buffer section 210 may also be a raised structure, such as a figure-shaped structure.
  • a space for relative deformation can be provided for the connector 200, so as to alleviate the tension or pressure generated by the relative displacement between the conductive units 100, and reduce the fracture of the connector 200. risk, to avoid disconnection of the current due to the breakage of the connector 200, and to improve the reliability of the battery module.
  • the second buffer section 210 may also be a Z-shaped structure.
  • the second buffer section 210 may also have a corrugated structure, which can be selected according to actual needs.
  • the first buffer section 130 can be a convex groove, and an included angle is set between the top wall 131 and the side wall 132 of the convex groove, for example, the angle between the top wall 131 and the side wall 132 It can be greater than 90°, less than 90°, or equal to 90°, which can be set as required.
  • the convex groove structure can increase the shaking space of the battery cells through its own deformation, thereby preventing the conductive unit 100 from being broken due to long-term stretching or compression.
  • the angle between the top wall 131 and the side wall 132 of the convex groove is greater than or equal to 90°, which is beneficial to the deformation of the conductive unit 100.
  • the second buffer section 210 can also be a convex groove, and the top wall 131 and the side wall 132 of the convex groove are arranged at an angle.
  • the angle between the top wall 131 and the side wall 132 can be greater than 90°, or less than 90°, or equal to 90°, which is conducive to the deformation of the connector 200 and avoids the fatigue of the connector 200 due to the shaking of the battery core. fracture.
  • the cells in adjacent cell rows are arranged alternately.
  • the adjacent conductive units 100 can be arranged alternately, so that the three continuous conductive units 100 have a herringbone structure or a V-shaped structure, and the number of conductive units 100 can be determined according to the number of cells in the battery module. This setting method can save the assembly space of the battery module, make the structure of the battery module more compact, and reduce the assembly cost.
  • the battery cells in adjacent battery cell rows are arranged oppositely.
  • the conductive units 100 can be arranged in parallel to adapt to the arrangement of the battery cells.
  • the number of conductive units 100 can be adjusted according to the battery The number of batteries in the module is set.
  • the battery connecting piece can be integrally formed by stamping, and the stamping process is simple, which is suitable for mass production.
  • the positive electrode of the cell is a cylindrical protrusion located in the middle, and the surrounding of the protrusion is a negative electrode. Therefore, an arc-shaped notch 121 that matches the positive pole of the battery cell can be provided in the negative electrode connection area 120.
  • This structure can increase the connection area between the negative electrode connection area 120 and the negative electrode of the battery cell, thereby improving the connection between the negative electrode connection area 120 and the battery cell. The reliability of the connection between the core and negative electrodes, thereby improving the reliability of the battery connection piece.
  • an inwardly concave arc-shaped structure may be provided on the connecting piece 200 , so that there is a narrow neck on the connecting piece 200 .
  • the narrow neck will fuse due to the concentration of thermal stress, and then cut off the current in the circuit, so as to prevent the conductive unit 100 electrically connected to the connector 200 from receiving a large current, thereby protecting the conductive unit 100.
  • Electrically connected battery cells avoid damage to the battery cells, thereby reducing losses and improving the safety performance of the battery module.
  • the positive connection area 110 and the negative connection area 120 are provided on the conductive unit 100, and the positive connection area 110 is electrically connected to the positive electrode of the battery cell, and the negative electrode connection area 120 is electrically connected to the negative electrode of the battery cell.
  • the parallel connection between the battery cells can be realized by setting the connector 200 to electrically connect the adjacent conductive units 100 .
  • the cushioning effect prevents the battery connecting piece from breaking and improves the reliability of the battery connecting piece; on the other hand, it can ensure the reliability of the connection between the battery cell and the battery connecting piece.
  • the present application also provides a battery module, including several battery cells and several above-mentioned battery connection pieces, wherein the positive electrode connection area 110 is electrically connected to the positive electrode of the battery cell, and the negative electrode connection area 120 is electrically connected to the negative electrode of the battery. Realize the series and parallel connection of the cells in the battery module.
  • each row is provided with 4 batteries
  • a battery connection piece as shown in Figure 1 is used between two adjacent rows of batteries to connect in series and parallel.
  • the battery module has a total of Use 3 battery connectors, and the installation directions of the 3 battery connectors are the same. At this time, one end of the battery module is all exposed positive poles, and the other end is all exposed negative poles. Connect all positive poles through the first copper bar. The poles are welded together as the positive pole of the battery module, and all the negative poles are welded together by the second copper bar as the negative pole of the battery module.
  • the present application also provides a battery pack, including the above-mentioned battery module.
  • the positive connection area and the negative connection area are provided on the conductive unit, and the positive connection area is electrically connected to the positive electrode of the battery cell, and the negative electrode connection area is electrically connected to the negative electrode of the battery cell, so that the series connection between the cells can be realized.
  • the connecting piece electrically connects the connected conductive units, which can realize the parallel connection between the cells, and then realize the series-parallel connection between the cells through the above-mentioned battery connecting piece.

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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

本申请提供了一种电池连接片、电池模组及电池包。其中，电池连接片包括多个导电单元，导电单元包括正极连接区、负极连接区和设置在正极连接区和负极连接区之间的第一缓冲段，正极连接区与电芯的正极电连接，负极连接区与电芯的负极电连接，相邻导电单元之间通过连接件电连接，能够实现电芯的串联和并联，能够对电芯之间的膨胀力、公差以及位移具有一定的缓冲作用，避免电池连接片断裂，提高电池连接片工作的可靠性，且能够保证电芯与电池连接片之间连接的可靠性。

Description

电池连接片、电池模组及电池包
本申请要求在2022年1月25日提交中国专利局、申请号为202220207047.5的中国专利申请的优先权，以上申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及电池技术领域，例如涉及一种电池连接片、电池模组及电池包。
背景技术
电池模组通常通过多个单体电池串联和并联连接组成，电池的串联和并联的连接方式不仅关系到电池模组的组装效率，还对电池模组的主要技术性能、使用寿命以及安全性有影响。
目前，单体电池之间的串联和并联通常是用金属带将并联电池模组中的单体电池的正极和负极分别焊接在一起，但是电池模组在使用过程中，单体电池会产生晃动，导致连接单体电池的金属带受到拉力或压力，长期使用会导致金属带出现褶皱甚至断裂的情况，金属带断裂会导致电路被切断，影响电池模组的正常工作。
发明内容
根据本申请的一个方面，本申请提供了一种电池连接片，能够实现电池模组中电芯的串联与并联，降低电池连接片断裂的风险。
第一方面，本申请提供了一种电池连接片，包括多个导电单元，
上述导电单元包括正极连接区、负极连接区和设置在上述正极连接区和上述负极连接区之间的第一缓冲段，上述正极连接区与电芯的正极电连接，上述负极连接区与上述电芯的负极电连接，相邻上述导电单元之间通过连接件电连接。
第二方面，本申请提供了一种电池模组，包括多个电芯和多个上述的电池连接片，上述正极连接区与上述电芯的正极电连接，上述负极连接区与上述电芯的负极电连接。
第三方面，本申请提供了一种电池包，包括上述的电池模组。
附图说明
图1是本申请提供的电池连接片的结构示意图一；
图2是本申请提供的电池连接片的结构示意图二；
图3是图1在A处的局部放大图。
图中：
100、导电单元；110、正极连接区；120、负极连接区；121、圆弧型缺口；130、第一缓冲段；131、顶壁；132、侧壁；200、连接件；210、第二缓冲段。
具体实施方式
在本申请的描述中，除非另有明确的规定和限定，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，可以具体情况理解上述术语在本申请中的具体含义。
在本申请中，除非另有明确的规定和限定，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”、“左”、“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必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。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。
本申请提供一种电池连接片，能够实现电芯单元的串、并联，缓和冲击，降低电池连接片断裂的风险，提高电池连接片工作的可靠性。
例如，如图1和图2所示，该电池连接片包括若干导电单元100，其中，导电单元100包括正极连接区110、负极连接区120和第一缓冲段130，正极连接区110与负极连接区120分别用于连接相邻两个电芯的正极及负极，第一缓冲段130设置在正极连接区110和负极连接区120之间，用于缓冲电芯正极和负极之间的公差，相邻的导电单元100之间通过连接件200电连接。
通过在导电单元100上设置正极连接区110和负极连接区120，并使正极连接区110与电芯的正极电连接，负极连接区120与电芯的负极电连接，能够实现电芯之间的串联，通过设置连接件200将相邻的导电单元100之间电连接，能够实现电芯之间的并联。通过在正极连接区110和负极连接区120之间设置第一缓冲段130，一方面，能够对电芯之间的膨胀力、 公差以及位移具有一定的缓冲作用，避免电池连接片断裂，提高电池连接片工作的可靠性；另一方面，能够保证电芯与电池连接片之间连接的可靠性。
例如，还可以在连接件200上设置第二缓冲端210，一方面，第二缓冲段210能够对相邻电芯之间的膨胀力、公差以及位移起到一定的缓冲作用，避免电池连接片断裂，提高电池连接片工作的可靠性；另一方面，能够保证电芯与电池连接片之间连接的可靠性。
在一个实施例中，正极连接区110与电芯的正极之间可以通过焊接的方式进行电连接，负极连接区120与电芯的负极之间也可以通过焊接的方式进行连接，通过设置第一缓冲段130与第二缓冲段210，能够在同个导电单元100的正极连接区110与负极连接区120分别与相邻两个电芯焊接时，起到一定缓冲作用，从而能够避免正极连接区110与电芯的正极之间以及负极连接区120与电芯的负极之间产生虚焊，提高电池连接片与电芯之间的连接强度，进而提高电池连接片工作的可靠性。在其他实施例中，正极连接区110与负极连接区120可以是向上凸起，也可以是向下凸起，正极连接区110与电芯的正极之间以及负极连接区120与电芯的负极之间也可以通过其他的方式进行连接，根据实际需要设置即可。
在一个实施例中，第一缓冲段130可以设置为凸起结构，例如，第一缓冲段130设置成几字型结构。由于在电池模组的使用过程中，多个电芯会出现轻微的相对晃动，而电芯的正负极通过焊接于导电单元100电连接，随着电芯的相对晃动，会拉伸或者压缩电池连接片，随着使用时间的变长，电池连接片会因疲劳而出现裂纹，进而断开。几字型结构能够在电芯晃动时为电池连接片提供相对的晃动空间，降低电池连接片断裂的风险。在另一个实施例中，第一缓冲段130也可以为Z形结构。在其它实施例中，第一缓冲段130还可以为波浪形结构，根据实际需要选择即可。
在一个实施例中，第二缓冲段210也可以为凸起结构，例如为几字型结构。在电芯并联时，由于相邻排组的电芯之间的晃动而使导电单元100之间存在相对位移，随着使用时间的变长，连接件200会因疲劳而断裂。通过将第二缓冲段210设置成几字型结构，能够为连接件200提供相对变形的空间，以此来缓和因导电单元100之间的相对位移而产生的拉力或压力，降低连接件200断裂的风险，避免由于连接件200断裂而使电流断开，提高电池模组工作的可靠性。在另一个实施例中，第二缓冲段210也可以为Z形结构。在其它实施例中，第二缓冲段210还可以为波浪形结构，根据实际需要选择即可。
例如，如图3所示，第一缓冲段130可以为凸槽，并设置凸槽的顶壁131和侧壁132之间呈夹角设置，例如，顶壁131和侧壁132之间的角度可以大于90°，也可以小于90°，还可以等于90°，根据需要设置即可。当相邻的电芯之间存在晃动时，凸槽结构能够通过自身的形变来增大电芯晃动的空间，进而避免导电单元100因长期拉伸或压缩而断裂。设置凸槽 的顶壁131与侧壁132之间的角度大于等于90°，有利于导电单元100的形变。当然，第二缓冲段210也可以为凸槽，并设置凸槽的顶壁131与侧壁132之间呈夹角设置。例如，顶壁131和侧壁132之间的角度可以大于90°，也可以小于90°，还可以等于90°，有利于连接件200发生形变，避免由于电芯的晃动而导致连接件200疲劳断裂。
在一个实施例中，相邻的电芯排组中的电芯之间交错设置。相应地，可以将相邻的导电单元100交错设置，使三个连续的导电单元100之间呈人字型结构或V型结构，导电单元100的个数可以根据电池模组中电芯的个数设置，这种设置方式能够节约电池模组的装配空间，使电池模组的结构更加紧凑，降低装配成本。
在另一个实施例中，相邻的电芯排组中的电芯相对设置，此时可以设置导电单元100之间平行设置，以适应电芯的排列方式，导电单元100的个数可以根据电池模组中电芯的个数设置。
例如，电池连接片可以通过冲压的方式一体成型，冲压工序简单，适用于量产。
在一个实施例中，电芯的正极为位于中间的圆柱形凸起，凸起周围为负极。因此，可以在负极连接区120设置与电芯正极极柱相匹配的圆弧型缺口121，这种结构能够增大负极连接区120与电芯负极的连接面积，进而提高负极连接区120与电芯负极之间连接的可靠性，进而提高电池连接片工作的可靠性。
例如，可以在连接件200上设置向内凹的圆弧形结构，使得连接件200上存在狭颈。当电路出现短路等极端情况时，狭颈处会由于热应力集中而熔断，进而切断电路中的电流，避免与连接件200电连接的导电单元100接收到大电流，进而保护与该导电单元100电连接的电芯，避免电芯损坏，进而降低损失，提高电池模组的安全性能。
本申请通过在导电单元100上设置正极连接区110和负极连接区120，并使正极连接区110与电芯的正极电连接，负极连接区120与电芯的负极电连接，能够实现电芯之间的串联，通过设置连接件200将相邻的导电单元100之间电连接，能够实现电芯之间的并联。通过在正极连接区110和负极连接区120之间设置第一缓冲段130，在连接件200上设置第二缓冲段210，一方面，能够对电芯之间的膨胀力、公差以及位移具有一定的缓冲作用，避免电池连接片断裂，提高电池连接片工作的可靠性；另一方面，能够保证电芯与电池连接片之间连接的可靠性。通过在连接件200上设置向内凹的弧形结构，使得连接件200上存在狭颈，进而当电路中出现短路等极端情况时，会因热应力集中而熔断，切断电路中的电流，进而保护电芯，提供电池模组的安全性能。
本申请还提供一种电池模组，包括若干电芯和若干上述电池连接片，其中正极连接区110与电芯的正极电连接，负极连接区120与电池的负极电连接，通过上述电池连接片实现电池 模组中电芯的串联与并联。
为了便于连接，现对上述电池连接片与若干电芯的装配方式进行简单介绍：
在本实施例中，设置6排电芯，每排设有4个电芯，相邻两排电芯之间使用一个如图1所示的电池连接片进行串、并联，该电池模组一共使用3个电池连接片，且3个电池连接片的安装方向一致，此时该电池模组的一端全是正极极柱裸露，另一端全是负极极柱裸露，通过第一铜排将所有正极极柱焊接在一起作为该电池模组的正极，通过第二铜排将所有负极极柱焊接在一起作为该电池模组的负极。
本申请还提供一种电池包，包括上述的电池模组。
本申请通过在导电单元上设置正极连接区和负极连接区，并使正极连接区与电芯的正极电连接，负极连接区与电芯的负极电连接，能够实现电芯之间的串联，通过连接件将相连导电单元之间电连接，能够实现电芯之间的并联，进而通过上述电池连接片实现电芯之间的串并连。通过在正极连接区与负极连接区之间设置第一缓冲段，在连接件上设置第二缓冲段，一方面，能够吸收电芯在堆叠过程中以及电芯本身的产生的公差，避免在上述电池连接片与电芯连接时产生虚焊的现象，提高上述电池连接片与电芯之间连接的可靠性；另一方面，能够缓和由于电芯晃动带来的冲击，降低上述电池连接片断裂的风险，提高上述电池连接片工作的可靠性。

Claims (13)

  1. 一种电池连接片，包括多个导电单元(100)，
    所述导电单元(100)包括正极连接区(110)、负极连接区(120)和设置在所述正极连接区(110)和所述负极连接区(120)之间的第一缓冲段(130)，所述正极连接区(110)与电芯的正极电连接，所述负极连接区(120)与所述电芯的负极电连接，相邻所述导电单元(100)之间通过连接件(200)电连接。
  2. 根据权利要求1所述的电池连接片，其中，所述连接件(200)上设有第二缓冲段(210)。
  3. 根据权利要求2所述的电池连接片，其中，所述第一缓冲段(130)和所述第二缓冲段(210)中的至少之一为凸起结构。
  4. 根据权利要求2所述的电池连接片，其中，所述第一缓冲段(130)和所述第二缓冲段(210)中的至少之一为Z形结构。
  5. 根据权利要求2所述的电池连接片，其中，所述第一缓冲段(130)和所述第二缓冲段(210)中的至少之一为波浪形结构。
  6. 根据权利要求2所述的电池连接片，其中，所述第一缓冲段(130)和所述第二缓冲段(210)中的至少之一为凸槽，所述凸槽的顶壁与侧壁之间呈夹角设置。
  7. 根据权利要求1-6任一项所述的电池连接片，其中，多个所述导电单元(100)之间交错设置，三个连续的所述导电单元(100)之间呈人字型结构或V型结构。
  8. 根据权利要求1-6任一项所述的电池连接片，其中，多个所述导电单元(100)之间平行设置。
  9. 根据权利要求1所述的电池连接片，其中，所述负极连接区(120)设有与所述电芯的正极极柱相匹配的圆弧型缺口(121)。
  10. 根据权利要求1所述的电池连接片，其中，所述连接件(200)上设有向内凹的弧形结构。
  11. 根据权利要求1所述的电池连接片，其中，所述电池连接片通过冲压一体成型。
  12. 一种电池模组，，包括多个电芯和多个根据权利要求1-11任一项所述的电池连接片，所述正极连接区(110)与所述电芯的正极电连接，所述负极连接区(120)与所述电芯的负极电连接。
  13. 一种电池包，包括根据权利要求12所述的电池模组。
PCT/CN2022/125240 2022-01-25 2022-10-14 电池连接片、电池模组及电池包 WO2023142536A1 (zh)

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