EP-4738542-A1 - BATTERY PACK

EP4738542A1EP 4738542 A1EP4738542 A1EP 4738542A1EP-4738542-A1

Abstract

A battery pack includes a housing (10); cells (20) accommodated in the housing, where the cell includes electrodes (21); a bracket (30) accommodated in the housing and supporting the plurality of cells; a first metal plate (61) accommodated in the housing, where the first metal plate is substantially perpendicular to the central axis of the cell, and the first metal plate has openings through which the airflow ejected from the electrodes passes through ; and a second metal plate (62) accommodated in the housing, where the second metal plate is substantially parallel to the first metal plate, and the second metal plate and the first metal plate form an exhaust channel (63a) for guiding the airflow to be discharged out of the housing.

Inventors

LI, Weibo
ZHANG, YUEXIANG
YANG, BIN

Assignees

Nanjing Chervon Industry Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20250226

Claims (15)

A battery pack (100), comprising: a housing (10); a plurality of cells (20) accommodated in the housing, wherein the plurality of cells comprises electrodes (21); a bracket (30) accommodated in the housing and supporting the plurality of cells; a first metal plate (61) accommodated in the housing, wherein the first metal plate is substantially perpendicular to a central axis of the cell, and the first metal plate has openings (31) through which airflow ejected from the electrodes passes; and a second metal plate (62) accommodated in the housing, wherein the second metal plate is substantially parallel to the first metal plate, and the second metal plate and the first metal plate form an exhaust channel (63, 63a) for guiding the airflow to be discharged out of the housing.
The battery pack of claim 1, wherein the first metal plate has a plurality of openings in one-to-one correspondence with positions of the electrodes of the plurality of cells.
The battery pack of claim 1, wherein the housing has an airflow outlet, at least part of the airflow outlet is provided with a fireproof part (13), and the fireproof part is made of a material different from a material of the housing.
The battery pack of claim 3, wherein the fireproof part is a metal plate having openings whose positions correspond to the airflow outlet.
The battery pack of claim 1, wherein the first metal plate and/or the second metal plate are made of an aluminum alloy material.
The battery pack of claim 1, further comprising a third metal plate (64) and a fourth metal plate (65), wherein the third metal plate is substantially perpendicular to the central axis of the cell, and the third metal plate has openings through which airflow ejected from the electrodes passes; the fourth metal plate is substantially parallel to the third metal plate, and the third metal plate and the fourth metal plate form an exhaust channel for guiding the airflow to be discharged out of the housing; the exhaust channel formed by the third metal plate and the fourth metal plate and the exhaust channel formed by the first metal plate and the second metal plate are located on different sides of the cell.
The battery pack of claim 1, wherein the bracket has end surfaces corresponding to positions of the electrodes of the plurality of cells, an end surface of the end surfaces has openings exposing the electrodes, the battery pack further comprises end covers accommodated in the housing, an end cover of the end covers is mounted onto a respective end surface of the end surfaces of the bracket, and sealant is filled between the end cover and the end surface.
The battery pack of claim 7, wherein the first metal plate is mounted onto the end cover, and the first metal plate is substantially parallel to the end cover.
The battery pack of claim 8, wherein positions of the openings on the first metal plate correspond to positions of the openings on the end surface of the bracket.
The battery pack of claim 7, wherein the end cover comprises a flame retardant material.
The battery pack of claim 7, wherein the sealant covers a plurality of electrodes, the plurality of electrodes covered by the sealant comprise first-type electrodes and second-type electrodes, and a shortest distance between the first-type electrodes and the end cover is less than a shortest distance between the second-type electrodes and the end cover.
The battery pack of claim 7, wherein separators are formed on the end cover and/or the end surface, the sealant is separated into a plurality of regions divided by the separators, and the sealant covers the electrodes in the plurality of regions.
The battery pack of claim 12, wherein a plurality of electrodes in a same region of the plurality of regions are electrically connected via a connection piece (70), and the connection piece electrically connects the plurality of electrodes in the same region via the openings through which the electrodes are exposed on the end surface.
The battery pack of claim 13, wherein a separator (50) of the separators surrounds the connection piece.
The battery pack of claim 7, wherein the cell further comprises a cell body (22), and at least part of the cell body is not covered by the sealant.

Description

TECHNICAL FIELD The present application relates to the technical field of power tools, for example, a battery pack. BACKGROUND Having gone through the evolution of power supply from manual operation to fuel supply, most of the tools currently widely used in various scenarios such as gardening and construction rely on lithium batteries for energy supply. In lithium battery technologies, safety is a key point. This encompasses safety at the micro level, which may be related to the positive and negative electrode materials of the plurality of cells, as well as safety at the macro level, involving waterproofing, insulation, heat dissipation, fire prevention, extrusion resistance, fall prevention, and the like. To improve the overall performance of the battery pack and enhance the adaptability of the battery pack for power tools to harsh working conditions, it is necessary to consider the preceding multiple factors comprehensively. This part provides background information related to the present application, and the background information is not necessarily the existing art. SUMMARY An object of the present application is to solve or at least alleviate part or all of the preceding problems. Therefore, the present application provides a battery pack. To achieve the preceding object, the present application adopts the technical solutions below. A battery pack includes a housing; cells accommodated in the housing, where the cell includes electrodes; a bracket accommodated in the housing and supporting the plurality of cells; a first metal plate accommodated in the housing, where the first metal plate is substantially perpendicular to the central axis of the cell, and the first metal plate has openings through which the airflow ejected from the electrodes passes through when thermal runaway occurs in the plurality of cells; and a second metal plate accommodated in the housing, where the second metal plate is substantially parallel to the first metal plate, and the second metal plate and the first metal plate form an exhaust channel for guiding the airflow to be discharged out of the housing. In some examples, the first metal plate has multiple openings in one-to-one correspondence with the positions of the electrodes of the plurality of cells. In some examples, the housing has an airflow outlet, at least part of the airflow outlet is provided with a fireproof part, and the fireproof part is made of a material different from a material of the housing. In some examples, the fireproof part is a metal plate having openings whose positions correspond to the airflow outlet. In some examples, the first metal plate and/or the second metal plate are made of an aluminum alloy material. In some examples, the battery pack further includes a third metal plate and a fourth metal plate, where the third metal plate is substantially perpendicular to the central axis of the cell, and the third metal plate has openings through which airflow ejected from the electrodes passes when thermal runaway occurs in the plurality of cells; the fourth metal plate is substantially parallel to the third metal plate, and the third metal plate and the fourth metal plate form an exhaust channel for guiding the airflow to be discharged out of the housing; the exhaust channel formed by the third metal plate and the fourth metal plate and the exhaust channel formed by the first metal plate and the second metal plate are located on different sides of the cell. In some examples, the bracket has end surfaces corresponding to the positions of the electrodes of the plurality of cells, the end surface has openings exposing the electrodes, the battery pack further includes end covers accommodated in the housing, the end cover is mounted onto the end surface of the bracket, and the sealant is filled between the end cover and the end surface. In some examples, the first metal plate is mounted onto the end cover, and the first metal plate is substantially parallel to the end cover. In some examples, the positions of the openings on the first metal plate correspond to the positions of the openings on the end surface of the bracket. In some examples, separators are formed on the end cover and/or the end surface, the sealant is separated into several regions divided by the separators, and the sealant covers the electrodes in the several regions region by region. In some examples, multiple electrodes in the same region are electrically connected via a connection piece, and the connection piece electrically connects the multiple electrodes in the same region via the openings through which the electrodes are exposed on the end surface. A battery pack includes a housing; multiple cells accommodated in the housing, where the cell includes electrodes; a bracket accommodated in the housing and supporting the plurality of cells, where the bracket has end surfaces corresponding to the positions of the electrodes of the plurality of cells, and the end surface has openings expo