EP-4738553-A1 - COVER PLATE ASSEMBLY AND BATTERY COMPRISING SAME

EP4738553A1EP 4738553 A1EP4738553 A1EP 4738553A1EP-4738553-A1

Abstract

A cover plate assembly (100) and a battery comprising same. The cover plate assembly (100) comprises a cover plate body (1), an electrode lead-out member (2), an outer conductive member (3), and a heat dissipation material (4); the outer conductive member (3) is provided with a through connecting hole (3a); the electrode lead-out member (2) is provided with a connecting portion (2a); the electrode lead-out member (2) passes through the cover plate body (1) and is connected to the outer conductive member (3) at the connecting hole (3a) by means of the connecting portion (2a) of the electrode lead-out member (2); and the heat dissipation material (4) is disposed in the connecting hole (3a) and is in contact with the connecting portion (2a). The electrode lead-out member (2) and the outer conductive member (3) disposed on the cover plate body (1) are combined to form a whole, the heat dissipation material (4) is disposed at the joint of the electrode lead-out member and the outer conductive member, and the heat of the electrode lead-out member (2) and the outer conductive member (3) is simultaneously absorbed by means of the heat dissipation material (4). The heat dissipation material (4) is simultaneously in contact with the electrode lead-out member (2) and the outer conductive member (3), thereby indirectly increasing the contact area between the electrode lead-out member (2) and the outer conductive member (3), and avoiding too high local temperature rise.

Inventors

CHEN, HU

Assignees

AESC Jiangsu Co., Ltd.
AESC HUBEI CO., LTD.
AESC ORDOS CO., LTD.
AESC Hebei Co., Ltd.
AESC Shanghai Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20231207

Claims (12)

A cover plate assembly, characterized in comprising a cover plate body, an electrode lead-out member, an outer conductive member, and a heat dissipation material, wherein the outer conductive member is provided with a through connecting hole, the electrode lead-out member is provided with a connecting portion, the electrode lead-out member passes through the cover plate body and is connected to the outer conductive member at the connecting hole by means of the connecting portion of the electrode lead-out member, the heat dissipation material is disposed in the connecting hole and is in contact with the connecting portion.
The cover plate assembly according to claim 1, characterized in that the heat dissipation material covers the connecting hole.
The cover plate assembly according to claim 2, characterized in that the cover plate assembly further comprises a positioning member, which is disposed within the connecting hole and covers a surface of the heat dissipation material facing away from one side of the connecting portion.
The cover plate assembly according to claim 3, characterized in that a surface of the positioning member facing away from one side of the heat dissipation material is equipped with a positioning portion, which is configured to be identified by a welding equipment.
The cover plate assembly according to claim 1, characterized in that the outer conductive member comprises a second metal member and a first metal member, wherein materials of the second metal member and the first metal member are different, the electrode lead-out member is connected to the connecting hole located on the second metal member through the connecting portion, with the second metal member being engaged with the first metal member.
The cover plate assembly according to claim 5, characterized in that a plurality of insertion portions protruding toward the second metal member are provided on the first metal member, matching portions are provided on the second metal member, each of the matching portions corresponding to and engaging with one of the insertion portions, the first metal member and the second metal member are engaged through the insertion portions and the matching portions.
The cover plate assembly according to claim 5, characterized in that in an axial direction of the connecting hole, the first metal member and the second metal member sequentially define the connecting hole, the heat dissipation material is disposed within the connecting hole and is in contact with the first metal member and the second metal member respectively.
The cover plate assembly according to any one of claims 1-7, characterized in that a wall surface of the connecting hole is provided with a first recessed portion, wherein the heat dissipation material is disposed within the first recessed portion.
The cover plate assembly according to any one of claims 1-7, characterized in that a surface of an area where the electrode lead-out member is located within the connecting hole is provided with a second recessed portion, wherein the heat dissipation material is disposed within the second recessed portion.
The cover plate assembly according to any one of claims 1-7, characterized in that the electrode lead-out member is welded to the outer conductive member at the connecting hole.
The cover plate assembly according to any one of claims 1-7, characterized in that the heat dissipation material is a phase change material.
A battery, characterized in comprising: the cover plate assembly according to any one of claims 1-11; a housing, wherein the cover plate assembly covers an opening of the housing, and together with the housing, defines an accommodating chamber, the accommodating chamber is configured for accommodating a battery cell.

Description

Technical Field The present disclosure pertains to the field of batteries, and more specifically relates to a cover plate assembly and a battery including the same. Description of Related Art Currently, in prismatic-housing batteries, an electrode assembly typically disposed on a cover plate body is electrically connected to a terminal post through an adapter. The electrode assembly is equipped with tabs, and the adapter includes a terminal post connection area and a tab connection area. The tab connection area is electrically connected to the tab, and the whole assembled unit is electrically connected to the terminal post through a terminal post connection area, thereby completing the electrode lead-out and assembly. In existing technologies, there is a method that does not use an adapter for the terminal post. Instead, a base plate is formed on a bottom surface of the terminal post, which extends through a cover plate through hole on the cover plate body and is electrically connected to an outer conductive member. The base plate is located on one side of the cover plate body close to the electrode assembly, and an insulating member is provided between the base plate and the cover plate body. The base plate is electrically connected to the tab led out from the electrode assembly. In order to ensure a current-carrying area of a battery cell and control temperature rise, solid terminal posts are employed in the industry. Moreover, it is necessary to ensure that the terminal posts are of sufficient size and have a specific thickness. This practice significantly increases the weight and cost of the terminal posts. On this basis, to reduce the weight and cost of the terminal posts, locally thinning the terminal posts or eliminating connecting tabs or similar methods are commonly adopted. However, these weight reduction measures may result in a decrease in a current-carrying cross-sectional area of the battery cell, leading to an increase in temperature rise, which adversely affects the safety performance and reliability of the battery cell. SUMMARY The technical problem addressed by this disclosure is to overcome the deficiencies of the related art by providing a cover plate assembly and a battery containing the same. This disclosure addresses the aforementioned technical issues through the following technical solution: A cover plate assembly includes a cover plate body, an electrode lead-out member, an outer conductive member, and a heat dissipation material. The outer conductive member is provided with a through connecting hole. The electrode lead-out member is provided with a connecting portion. The electrode lead-out member passes through the cover plate body and is connected to the outer conductive member at the connecting hole by means of the connecting portion of the electrode lead-out member. The heat dissipation material is disposed in the connecting hole and is in contact with the connecting portion. The cover plate assembly is formed by a combination of the electrode lead-out member and the outer conductive member disposed on the cover plate body as a whole. The heat dissipation material is disposed at a joint of the electrode lead-out member and the outer conductive member, and the heat of the electrode lead-out member and the outer conductive member is simultaneously absorbed by means of the heat dissipation material. The heat dissipation material is simultaneously in contact with the electrode lead-out member and the outer conductive member, thereby indirectly increasing the contact area between the electrode lead-out member and the outer conductive member, and avoiding the rise of local temperature. Therefore, the structural configuration enables the cover plate assembly to achieve the objectives of material savings, weight reduction, and cost reduction while effectively controlling temperature rise and ensuring reliability in use. Preferably, the heat dissipation material covers the connecting hole. The heat dissipation material is configured to cover the entire connecting hole to enhance the heat dissipation effect. Preferably, the cover plate assembly further includes a positioning member, which is disposed within the connecting hole and covers a surface of the heat dissipation material facing away from one side of the connecting portion. By configuring the positioning member over the heat dissipation material, the purpose of securing the heat dissipation material is achieved, thereby ensuring that the heat dissipation material remains within the connecting hole. Preferably, a surface of the positioning member facing away from one side of the heat dissipation material is equipped with a positioning portion, which is configured to be identified by a welding equipment. By providing the positioning portion on the surface of the positioning member, it is possible to facilitate the identification and positioning by the welding equipment when welding an end surface of the outer conductive member, th