WO2023088439A1 - 一种电池的卷芯连接结构及电池 - Google Patents

一种电池的卷芯连接结构及电池 Download PDF

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Publication number
WO2023088439A1
WO2023088439A1 PCT/CN2022/132950 CN2022132950W WO2023088439A1 WO 2023088439 A1 WO2023088439 A1 WO 2023088439A1 CN 2022132950 W CN2022132950 W CN 2022132950W WO 2023088439 A1 WO2023088439 A1 WO 2023088439A1
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WIPO (PCT)
Prior art keywords
adapter piece
winding core
battery
tabs
pole
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PCT/CN2022/132950
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English (en)
French (fr)
Inventor
蒋治亿
杨帆
卢林
魏思伟
王红明
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江苏天合储能有限公司
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Application filed by 江苏天合储能有限公司 filed Critical 江苏天合储能有限公司
Publication of WO2023088439A1 publication Critical patent/WO2023088439A1/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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • 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
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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 power batteries, in particular to a winding core connection structure of a battery and the battery.
  • lithium-ion batteries Under the support of the two trillion-level markets of electric vehicles and energy storage, lithium-ion batteries have attracted the attention of the downstream market. With the large-scale promotion of electric vehicles and energy storage products, people have higher demands on the charging speed of electric vehicles and the service life of energy storage products. The cycle life, dynamic performance and fast charging capability of lithium-ion batteries directly affect the charging speed and service life of the terminal, and determine the quality of the product. These performance indicators will be affected by the temperature rise and internal resistance of the battery core.
  • the winding core of the battery usually has a rectangular parallelepiped structure.
  • the X direction represents the width direction of the winding core
  • the Y direction represents the thickness direction of the winding core
  • the Z direction represents the length direction of the winding core.
  • Two tabs 2', one positive and one negative, are arranged on the side of the width-thickness direction, and the two tabs 2' are arranged at intervals along the width direction of the winding core 1', and the positive tabs of two adjacent winding cores 1' pass through
  • the adapter piece is electrically connected to the positive pole on the battery end cover, and the two negative pole ears are electrically connected to the negative pole on the battery end cover through the adapter piece.
  • the thickness of the pole piece is fixed, the thickness of the tab is usually fixed.
  • the width is wider, the cross-sectional area is larger, and the corresponding internal resistance is smaller, resulting in heat loss. The less, the better the overcurrent capability.
  • the width and dimension of the tabs are limited.
  • An object of the present application is to provide a winding core connection structure of a battery, which has a good current flow capacity of tabs and a compact overall structure.
  • Another object of the present application is to provide a battery, which has a small internal resistance, a compact structure, and a high capacity density by providing the above-mentioned winding core connection structure of the battery.
  • a winding core connection structure of a battery comprising:
  • Two winding cores are arranged along the first direction, and two tabs with opposite polarities are arranged on the end surface of each winding core along the first direction, and the tabs are arranged along the second direction, along the In the first direction, the polarities of the two tabs located in the middle are the same, and the polarities of the two tabs located at both ends are the same;
  • the first adapter piece is strip-shaped and extends along the second direction, and the two tabs located in the middle are connected to the first adapter piece;
  • the second adapter piece is U-shaped and is arranged around the first adapter piece, and the two tabs at both ends are respectively connected to the second adapter piece;
  • the first adapter piece and the second adapter piece are respectively configured to be connected to poles of the battery.
  • the dimension of the winding core along the second direction is larger than the dimension along the first direction.
  • the tab located in the middle is a first tab
  • the first tab has a V-shaped structure and includes a connected first connecting portion and a first bending portion, and the first The connecting part is connected to the winding core, and the first bending part is attached and connected to the first adapter piece;
  • the tabs located at both ends are second tabs, the second tabs have a V-shaped structure and include a second connecting portion and a second bending portion connected to each other, and the second connecting portion is connected to the winding core connected, the second bent portion is attached to and connected to the second adapter piece.
  • the opening side of the first tab and the opening side of the second tab on the same winding core are arranged opposite to each other.
  • the first bending part is attached to the side of the first adapter sheet facing the winding core, and the second bending part is attached to the second turn The side of the tab facing away from the winding core.
  • the first bent portion is welded to the first adapter piece, and the second bent portion is welded to the second adapter piece.
  • the second adapter piece includes:
  • a base part extending along the first direction, the base part being used to connect with the pole of the battery;
  • Two extension parts are respectively connected to both ends of the base part, the extension parts extend along the second direction, and each of the extension parts is correspondingly connected to one of the tabs, and the width of the base part is W greater than the width B of the extension.
  • the first end of the first adapter piece protrudes from the surrounding range of the second adapter piece, and the first end is used to communicate with The poles of the battery are connected.
  • the first adapter piece and the second adapter piece are disposed symmetrically about a line extending along the second direction.
  • a battery comprising a casing, an end cover and the winding core connection structure of the battery, the winding core connection structure of the battery is arranged in the casing, the end cap can seal the casing, the The end cap is provided with a first pole and a second pole, the first adapter piece is connected to the first pole, and the second adapter piece is connected to the second pole.
  • the first pole is welded to the first adapter piece, and the second pole is welded to the second adapter piece.
  • the two winding cores are arranged along the first direction, and the two tabs on the winding core are also arranged along the first direction, that is, the two tabs complement each other in the second direction, Therefore, each tab can be set to a larger size along the second direction to increase the cross-section of the tab, thereby improving the flow capacity of the tab and reducing heat loss;
  • the first adapter piece arranged in a strip shape The second adapter piece arranged in a U shape can conveniently electrically connect the tabs of the same polarity on the two winding cores respectively, and then electrically connect them to the positive and negative poles of the battery respectively, so as to meet the positive and negative poles of the winding cores.
  • the arrangement that the negative tab protrudes from the same side of the winding core makes the connection structure of the battery winding core more compact.
  • the battery of the present application has a small internal resistance, a compact structure, and a high capacity density by providing the above-mentioned winding core connection structure of the battery.
  • Fig. 1 is a structural schematic diagram of a winding core and a tab provided in the prior art
  • Fig. 2 is a front view of the winding core connection structure of the battery provided in the specific embodiment of the present application;
  • Fig. 3 is a top view of the winding core connection structure of the battery provided in the specific embodiment of the present application.
  • Fig. 4 is a cross-sectional view of A-A in Fig. 3 .
  • 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.
  • This embodiment provides a winding core connection structure of a battery and a battery.
  • the battery includes a casing, an end cover, and a winding core connection structure of the battery.
  • One end of the casing has an opening, and the winding core connection structure of the battery is arranged in the casing.
  • the opening of the casing can be blocked, and the end cover is provided with a first pole and a second pole.
  • the winding core connection structure of the battery includes two winding cores 1, the first adapter sheet 3 and the second adapter sheet 4, where the Y direction in the figure indicates the first direction, which is also the winding core 1
  • the direction of thickness the X direction represents the second direction, which is also the width direction of the winding core 1
  • the Z direction represents the length direction of the winding core 1
  • two The winding core 1 is arranged along the thickness direction of the winding core 1 (that is, the Y direction)
  • two tabs with opposite polarities are arranged along the thickness direction on the end surface of each winding core 1 in the width-thickness direction, and the tabs are arranged along the thickness direction.
  • the width direction of the winding core 1 is set. Along the thickness direction of the winding core 1, the polarities of the two tabs in the middle are the same, and the polarities of the two tabs at both ends are the same.
  • the two tabs in the middle is the first tab 21, and the two tabs at both ends are the second tab 22, if the first tab 21 is positive, the second tab 22 is negative, if the first tab 21 is negative, the second tab Ear 22 is the positive pole.
  • the first adapter piece 3 is strip-shaped and extends along the width direction of the winding core 1 , and two first tabs 21 are connected to the first adapter piece 3 .
  • the second adapter piece 4 is U-shaped and is arranged around the first adapter piece 3.
  • the second adapter piece 4 includes a base part 41 and two extension parts 42.
  • the base part 41 is along the thickness direction of the winding core 1.
  • two extension parts 42 are respectively connected to two ends of the base part 41 , the extension parts 42 extend along the width direction of the winding core 1 , and each extension part 42 is correspondingly connected to a tab.
  • the first adapter piece 3 is connected to the first pole, and the base portion 41 of the second adapter piece 4 is connected to the second pole. It should be noted that the connection here means realizing both mechanical connection and electrical connection.
  • the two tabs are arranged along the width direction of the winding core 1, so each tab can be set to a larger size along the width direction of the winding core 1, so that the tabs
  • the cross-section is increased, thereby improving the flow capacity of the lug and reducing heat loss;
  • the first adapter piece 3 arranged in a strip and the second adapter piece 4 arranged in a U shape can conveniently connect the two winding cores
  • the tabs with the same polarity on 1 are electrically connected respectively, and then electrically connected with the first pole and the second pole of the battery respectively, so that the positive and negative tabs of the winding core 1 protrude from the same side of the winding core 1
  • the arrangement makes the connection structure of the battery winding core 1 more compact.
  • the battery of this embodiment has a small internal resistance, a compact structure, and a high capacity density by providing the above-mentioned winding core connection structure of the battery.
  • first pole is welded to the first adapter piece 3
  • second pole is welded to the second adapter piece 4 .
  • Specific welding process parameters can be selected and set according to the size and material of the pole and tab, and are not limited here.
  • the first tab 21 and the second tab 22 are arranged symmetrically with respect to a line along the width direction of the winding core 1 , and correspondingly, the first adapter piece 3 and the second adapter piece 4 are also arranged symmetrically. It is arranged symmetrically about a straight line along the width direction of the winding core 1 . Since the first pole and the second pole are usually arranged at intervals on the center line extending along the width direction of the end cap, the first adapter piece 3 and the second adapter piece 4 are arranged as a symmetrical structure to facilitate the realization of their respective connection with the first pole. Connection of pole and second pole.
  • the width W of the base portion 41 is greater than the width B of the extension portion 42 , setting the width of the extension portion 42 to be narrower can prevent the extension portion 42 from contacting the first adapter piece 3 , and the base portion
  • the larger width dimension of 41 can ensure enough area for connection with the second pole.
  • the first end 31 of the first adapter sheet 3 is used to connect with the first pole of the battery, and the first end 31 of the first adapter sheet 3 It protrudes from the encircling range of the second adapter piece 4, so that a certain distance is maintained between the first end 31 and the second adapter piece 4, thereby preventing the first pole and the second adapter piece 4 from occurring Short circuit problem.
  • the first tab 21 has a V-shaped structure and includes a connected first connecting portion 211 and a first bending portion 212, the first connecting portion 211 is connected to the winding core 1, and the second A bent portion 212 is attached and connected to the first adapter piece 3 , and the first bent portion 212 is attached to the first adapter piece 3 to ensure the reliability of the connection between the two.
  • the second tab 22 has a V-shaped structure and includes a second connecting portion 221 and a second bending portion 222 connected, the second connecting portion 221 is connected to the winding core 1 , the second bending portion 222 is connected to the second The adapter piece 4 is fitted and connected.
  • the second bending portion 222 is attached to the second adapter piece 4 to ensure the reliability of the connection between the two.
  • the first bent portion 212 is welded to the first adapter piece 3, and the second bent portion 222 is welded to the extension portion 42 of the second adapter piece 4.
  • the specific welding process parameters can be determined according to the tab and the material of the adapter piece, etc., are not limited here.
  • the opening side of the V-shaped structure of the first tab 21 and the opening side of the V-shaped structure of the second tab 22 on the same winding core 1 are arranged oppositely, so that the two poles with opposite polarities The lugs extend away from each other, thereby preventing the problem of a short circuit between two tabs of the winding core 1 .
  • the first bent portion 212 is attached to the side of the first adapter sheet 3 facing the core 1
  • the second bent portion 222 is attached to the side of the second adapter sheet 4 facing away from the core 1 .
  • the first pole and the second pole can be selected to protrude from the end cap toward the side close to the winding core 1, so as to It is connected with the first end 31 of the first adapter piece 3 and the base portion 41 of the second adapter piece 4 .
  • the first adapter piece 3 is also possible to choose to set the first adapter piece 3 as a structure in which the first end 31 is bent and tilted toward the side close to the end cap, so as to be in contact with the first pole; the second adapter piece 4
  • the configuration is that: the base part 41 is bent and tilted toward the side close to the end cover relative to the extension part 42, so as to realize contact connection with the second pole.

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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

本申请涉及动力电池技术领域，公开了一种电池的卷芯连接结构及电池。电池包括电池的卷芯连接结构，电池的卷芯连接结构包括两个卷芯、第一转接片及第二转接片，两个卷芯沿第一方向排布，每个卷芯的端面上沿第一方向排布有两个极性相反的极耳，极耳沿第二方向设置，沿第一方向，位于中间的两个极耳的极性相同，位于两端的两个极耳极性相同，第一转接片，呈条状并沿第二方向延伸，位于中间的两个极耳与第一转接片连接，第二转接片，呈U型且环设于第一转接片，位于两端的两个极耳分别与第二转接片连接，第一转接片和第二转接片分别被配置为与电池的极柱连接。电池和电池的卷芯连接结构，极耳过流能力好、整体结构紧凑。

Description

一种电池的卷芯连接结构及电池 技术领域
本申请涉及动力电池技术领域，尤其涉及一种电池的卷芯连接结构及电池。
背景技术
在电动汽车及储能这两个万亿级市场的加持下，锂离子电池备受下游市场关注。随着电动汽车及储能产品的大规模推广，人们对电动汽车的充电速度及储能产品的使用寿命有了更高的需求。锂离子电池的循环寿命、动力学性能及快充能力直接影响终端的充电速度及和使用寿命，决定产品的优劣。而这上述些性能指标会受到电池卷芯温升、内阻的影响。
如图1所示，电池的卷芯通常呈长方体结构，图中X向表示卷芯的宽度方向，Y向表示卷芯的厚度方向，Z向表示卷芯的长度方向，卷芯1′在其宽度-厚度方向的侧面上设置一正一负两个极耳2′，且两个极耳2′沿卷芯1′的宽度方向间隔设置，相邻的两个卷芯1′的正极耳通过转接片电连接后与电池端盖上的正极柱连接，两个负极耳通过转接片电连接后与电池端盖上的负极柱连接。对于极耳而言，由于极片的厚度固定，故极耳的厚度尺寸通常为固定的，当其宽度越宽时，其横截面积越大，则对应的内阻越小、产生的热损耗越少、过流能力越好。但两个极耳沿卷芯宽度方向布置的方式中极耳的宽度尺寸局限大。
因此，亟待一种电池的卷芯连接结构及电池来解决上述问题。
发明内容
本申请的一个目的在于提出一种电池的卷芯连接结构，极耳过流能力好、整体结构紧凑。
本申请的另一个目的在于提出一种电池，通过设置上述的电池的卷芯连接结构，内阻小，结构紧凑、能力密度高。
为达此目的，本申请采用以下技术方案：
一种电池的卷芯连接结构，包括：
两个卷芯，沿第一方向排布，每个所述卷芯的端面上沿所述第一方向排布有 两个极性相反的极耳，所述极耳沿第二方向设置，沿所述第一方向，位于中间的两个所述极耳的极性相同，位于两端的两个所述极耳极性相同；
第一转接片，呈条状并沿所述第二方向延伸，位于中间的两个所述极耳与所述第一转接片连接；
第二转接片，呈U型且环设于所述第一转接片，位于两端的两个所述极耳分别与所述第二转接片连接；
所述第一转接片和所述第二转接片分别被配置为与电池的极柱连接。
作为一个可选的方案，所述卷芯沿所述第二方向的尺寸大于沿所述第一方向的尺寸。
作为一个可选的方案，位于中间的所述极耳为第一极耳，所述第一极耳呈V型结构并包括相连接的第一连接部和第一弯折部，所述第一连接部与所述卷芯连接，所述第一弯折部与所述第一转接片贴合设置并连接；
位于两端的所述极耳为第二极耳，所述第二极耳呈V型结构并包括相连接的第二连接部和第二弯折部，所述第二连接部与所述卷芯连接，所述第二弯折部与所述第二转接片贴合设置并连接。
作为一个可选的方案，同一个所述卷芯上的所述第一极耳的开口侧和所述第二极耳的开口侧相对设置。
作为一个可选的方案，所述第一弯折部贴合连接于所述第一转接片朝向所述卷芯的一侧，所述第二弯折部贴合连接于所述第二转接片背离所述卷芯的一侧。
作为一个可选的方案，所述第一弯折部与所述第一转接片焊接连接，所述第二弯折部与所述第二转接片焊接连接。
作为一个可选的方案，所述第二转接片包括：
基体部，沿所述第一方向延伸，所述基体部用于与所述电池的极柱连接；
两个延伸部，分别连接于所述基体部的两端，所述延伸部沿所述第二方向延伸，每个所述延伸部对应与一个所述极耳连接，所述基体部的宽度W大于所述延伸部的宽度B。
作为一个可选的方案，沿所述卷芯的宽度方向，所述第一转接片的第一端伸出于所述第二转接片的环设范围，所述第一端用于与所述电池的极柱连接。
作为一个可选的方案，所述第一转接片和所述第二转接片关于沿所述第二方 向延伸的直线对称设置。
一种电池，包括壳体、端盖和所述的电池的卷芯连接结构，所述电池的卷芯连接结构设置在所述壳体内，所述端盖能封堵所述壳体，所述端盖上设置有第一极柱和第二极柱，所述第一转接片与所述第一极柱连接，所述第二转接片与所述第二极柱连接。
作为一个可选的方案，所述第一极柱与所述第一转接片焊接连接，所述第二极柱与所述第二转接片焊接连接。
本申请有益效果为：
本申请的电池的卷芯连接结构，两个卷芯沿第一方向排布，卷芯上的两个极耳也沿第一方向排布，即两个极耳在第二方向上互补影响，故可以将每个极耳沿第二方向设置成较大的尺寸，使极耳的横截面增大，从而提高极耳的过流能力，降低热损耗；通过条形设置的第一转接片和呈U型设置的第二转接片能方便地将两个卷芯上极性相同的极耳分别进行电连接，进而再分别与电池的正、负极柱电连接，满足卷芯的正、负极耳从卷芯的同侧伸出的设置方式，使电池卷芯的连接结构更为紧凑。
本申请的电池，通过设置上述的电池的卷芯连接结构，内阻小，结构紧凑、能力密度高。
附图概述
本发明的特征、性能由以下的实施例及其附图进一步描述。
图1是现有技术提供的卷芯和极耳的结构示意图；
图2是本申请具体实施方式提供的电池的卷芯连接结构的主视图；
图3是本申请具体实施方式提供的电池的卷芯连接结构的俯视图；
图4是图3中的A-A剖视图。
图中：
1′-卷芯；2-′极耳；
1-卷芯；
21-第一极耳；211-第一连接部；212-第一弯折部；22-第二极耳；221-第二连接部；222-第二弯折部；
3-第一转接片；31-第一端；
4-第二转接片；41-基体部；42-延伸部。
本发明的较佳实施方式
下面结合附图和实施例对本申请作进一步的详细说明。可以理解的是，此处所描述的具体实施例仅用于解释本申请，而非对本申请的限定。另外还需要说明的是，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结构。
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”、“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。
本实施例提供了一种电池的卷芯连接结构及电池，电池包括壳体、端盖和电池的卷芯连接结构，壳体一端具有开口，电池的卷芯连接结构设置在壳体内，端盖能封堵壳体的开口，端盖上设置有第一极柱和第二极柱。如图2-图4所示，电池的卷芯连接结构包括两个卷芯1、第一转接片3和第二转接片4，其中图中Y向表示第一方向，也是卷芯1的厚度方向，X向表示第二方向，也是卷芯1的宽度方向， Z向表示卷芯1的长度方向，且卷芯1长度方向的尺寸＞宽度方向的尺寸＞厚度方向的尺寸，两个卷芯1沿卷芯1的厚度方向(即Y向)排布，每个卷芯1的在宽度-厚度方向的端面上沿厚度方向排布有两个极性相反的极耳，极耳沿卷芯1的宽度方向设置，沿卷芯1的厚度方向，位于中间的两个极耳的极性相同，位于两端的两个极耳极性相同，本实施例中位于中间的两个极耳为第一极耳21，位于两端的两个极耳为第二极耳22，若第一极耳21为正极则第二极耳22为负极，若第一极耳21为负极则第二极耳22为正极。第一转接片3呈条状并沿卷芯1的宽度方向延伸，两个第一极耳21与第一转接片3连接。第二转接片4呈U型且环设于第一转接片3，具体地，第二转接片4包括基体部41和两个延伸部42，基体部41沿卷芯1的厚度方向延伸，两个延伸部42分别连接于基体部41的两端，延伸部42沿卷芯1的宽度方向延伸，每个延伸部42对应与一个极耳连接。第一转接片3与第一极柱连接，第二转接片4的基体部41与第二极柱连接，需要说明的是此处的连接表示同时实现机械连接和电连接。
本实施例的电池的卷芯连接结构，两个极耳沿卷芯1的宽度方向进行排布，故可以将每个极耳沿卷芯1的宽度方向设置成较大的尺寸，使极耳的横截面增大，从而提高极耳的过流能力，降低热损耗；通过条形设置的第一转接片3和呈U型设置的第二转接片4能方便地将两个卷芯1上极性相同的极耳分别进行电连接，进而再分别与电池的第一极柱、第二极柱电连接，满足卷芯1的正、负极耳从卷芯1的同侧伸出的设置方式，使电池卷芯1的连接结构更为紧凑。本实施例的电池，通过设置上述的电池的卷芯连接结构，内阻小，结构紧凑、能力密度高。
本实施例中，第一极柱与第一转接片3焊接连接，第二极柱与第二转接片4焊接连接。具体的焊接工艺参数可根据极柱和极耳的尺寸、材料等选择设置，在此不做限定。
优选地，如图3所示，第一极耳21和第二极耳22关于沿卷芯1的宽度方向的直线对称设置，对应的，第一转接片3和第二转接片4也关于沿卷芯1宽度方向直线对称设置。由于第一极柱和第二极柱通常间隔设置在端盖沿宽度方向延伸的中线上，将第一转接片3和第二转接片4设置为对称的结构便于实现其分别与第一极柱和第二极柱的连接。
优选地，如图3所示，基体部41的宽度W大于延伸部42的宽度B，将延伸部 42的宽度设置为较窄可以防止延伸部42与第一转接片3接触，将基体部41设置的宽度尺寸较大可以保证具有足够的面积与第二极柱进行连接。
进一步的，如图3所示，沿卷芯1的宽度方向，第一转接片3的第一端31用于与电池的第一极柱连接，第一转接片3的第一端31伸出于第二转接片4的环设范围，从而使第一端31与第二转接片4之间保持一定的距离，进而防止第一极柱与第二转接片4之间发生短路问题。
优选地，如3和图4所示，第一极耳21呈V型结构并包括相连接的第一连接部211和第一弯折部212，第一连接部211与卷芯1连接，第一弯折部212与第一转接片3贴合设置并连接，第一弯折部212与第一转接片3贴合设置能保证两者连接的可靠性。同样的，第二极耳22呈V型结构并包括相连接的第二连接部221和第二弯折部222，第二连接部221与卷芯1连接，第二弯折部222与第二转接片4贴合设置并连接。第二弯折部222与第二转接片4贴合设置能保证两者连接的可靠性。本实施例中，第一弯折部212与第一转接片3焊接连接，第二弯折部222与第二转接片4的延伸部42焊接连接，具体焊接的工艺参数可根据极耳和转接片的材料等选择设置，在此不做限定。
优选地，如图4所示，同一个卷芯1上的第一极耳21的V型结构开口侧和第二极耳22的V型结构开口侧相对设置，使极性相反的两个极耳朝着远离彼此的方向延伸，从而防止卷芯1的两个极耳之间发生短路的问题。
进一步地，如图4所示，第一弯折部212贴合连接于第一转接片3朝向卷芯1的一侧，第二弯折部222贴合连接于第二转接片4背离卷芯1的一侧，从而进一步将极性相反的两个极耳隔离开，防止焊接过程造成短路。需要说明的是，由于第二极耳22的第二弯折部222位于第二转接片4背离卷芯1的一侧，也即朝向电池的端盖一侧，为了保证第一转接片3和第二转接片4分别与第一极柱和第二极柱连接，则可以选择将第一极柱、第二极柱设置为朝靠近卷芯1一侧凸出于端盖，以与第一转接片3的第一端31和第二转接片4的基体部41连接。其他实施例中，也可以选择将第一转接片3设置为第一端31朝靠近端盖一侧弯折翘起的结构，以与第一极柱接触连接；将第二转接片4设置为：基体部41相对于延伸部42朝靠近端盖一侧弯折翘起，以实现与第二极柱的接触连接。
显然，本申请的上述实施例仅仅是为了清楚说明本申请所作的举例，而并非 是对本申请的实施方式的限定，对于本领域的普通技术人员，依据本申请的思想，在具体实施方式及应用范围上均会有改变之处，本说明书内容不应理解为对本申请的限制。凡在本申请的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本申请权利要求的保护范围之内。

Claims (11)

  1. 一种电池的卷芯连接结构，其特征在于，包括：
    两个卷芯(1)，沿第一方向排布，每个所述卷芯(1)的端面上沿所述第一方向排布有两个极性相反的极耳，所述极耳沿第二方向设置，沿所述第一方向，位于中间的两个所述极耳的极性相同，位于两端的两个所述极耳极性相同；
    第一转接片(3)，呈条状并沿所述第二方向延伸，位于中间的两个所述极耳与所述第一转接片(3)连接；
    第二转接片(4)，呈U型且环设于所述第一转接片(3)，位于两端的两个所述极耳分别与所述第二转接片(4)连接；
    所述第一转接片(3)和所述第二转接片(4)分别被配置为与电池的极柱连接。
  2. 如权利要求1所述的电池的卷芯连接结构，其特征在于，所述卷芯(1)沿所述第二方向的尺寸大于沿所述第一方向的尺寸。
  3. 如权利要求1所述的电池的卷芯连接结构，其特征在于，位于中间的所述极耳为第一极耳(21)，所述第一极耳(21)呈V型结构并包括相连接的第一连接部(211)和第一弯折部(212)，所述第一连接部(211)与所述卷芯(1)连接，所述第一弯折部(212)与所述第一转接片(3)贴合设置并连接；
    位于两端的所述极耳为第二极耳(22)，所述第二极耳(22)呈V型结构并包括相连接的第二连接部(221)和第二弯折部(222)，所述第二连接部(221)与所述卷芯(1)连接，所述第二弯折部(222)与所述第二转接片(4)贴合设置并连接。
  4. 如权利要求3所述的电池的卷芯连接结构，其特征在于，同一个所述卷芯(1)上的所述第一极耳(21)的开口侧和所述第二极耳(22)的开口侧相对设置。
  5. 如权利要求3所述的电池的卷芯连接结构，其特征在于，所述第一弯折部(212)贴合连接于所述第一转接片(3)朝向所述卷芯(1)的一侧，所述第二弯折部(222)贴合连接于所述第二转接片(4)背离所述卷芯(1)的一侧。
  6. 如权利要求3所述的电池的卷芯连接结构，其特征在于，所述第一弯折部(212)与所述第一转接片(3)焊接连接，所述第二弯折部(222)与所述第二转接片(4)焊接连接。
  7. 如权利要求1-6任一项所述的电池的卷芯连接结构，其特征在于，所述第二转接片(4)包括：
    基体部(41)，沿所述第一方向延伸，所述基体部(41)用于与所述电池的极柱连接；
    两个延伸部(42)，分别连接于所述基体部(41)的两端，所述延伸部(42)沿所述第二方向延伸，每个所述延伸部(42)对应与一个所述极耳连接，所述基体部(41)的宽度W大于所述延伸部(42)的宽度B。
  8. 如权利要求1-6任一项所述的电池的卷芯连接结构，其特征在于，沿所述第二方向，所述第一转接片(3)的第一端(31)伸出于所述第二转接片(4)的环设范围，所述第一端(31)用于与所述电池的极柱连接。
  9. 如权利要求1-6任一项所述的电池的卷芯连接结构，其特征在于，所述第一转接片(3)和所述第二转接片(4)关于沿所述第二方向延伸的直线对称设置。
  10. 一种电池，其特征在于，包括壳体、端盖和权利要求1-9任一项所述的电池的卷芯连接结构，所述电池的卷芯连接结构设置在所述壳体内，所述端盖能封堵所述壳体，所述端盖上设置有第一极柱和第二极柱，所述第一转接片(3)与所述第一极柱连接，所述第二转接片(4)与所述第二极柱连接。
  11. 如权利要求10所述的电池，其特征在于，所述第一极柱与所述第一转接片(3)焊接连接，所述第二极柱与所述第二转接片(4)焊接连接。
PCT/CN2022/132950 2021-11-19 2022-11-18 一种电池的卷芯连接结构及电池 WO2023088439A1 (zh)

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