Battery including insulation piece having drainage groove and electrical device including the same

Patent metadata

Field	Value
Publication number	US-12519192-B2
Application number	US-202519060826-A
Country	US
Kind code	B2
Filing date	Feb 24, 2025
Priority date	Feb 27, 2023
Publication date	Jan 6, 2026
Grant date	Jan 6, 2026

Abstract

This application provides a battery and an electrical device. The battery includes a battery cell, a busbar, and an insulation piece. The battery cell includes a shell and an electrode terminal. The shell includes a first wall. The electrode terminal is disposed on the first wall. The busbar is electrically connected to the electrode terminal. The insulation piece is disposed on one side, facing the electrode terminal, of the busbar and covers at least a part of the first wall. The insulation piece includes a first groove recessed along a direction facing away from the first wall. In the battery and electrical device, the first groove is available for accommodating an electrolyte solution leaking from a battery cell.

First claim

What is claimed is:

1 . A battery, comprising:
a battery cell, comprising a shell and an electrode terminal, wherein the shell comprises a first wall, and the electrode terminal is disposed on the first wall; a busbar, electrically connected to the electrode terminal; and an insulation piece, disposed on one side, facing the electrode terminal, of the busbar and covering at least a part of the first wall, wherein the insulation piece includes a first groove recessed along a direction facing away from the first wall such that the first groove is open toward the first wall, wherein the insulation piece further includes a second wall facing the first wall, the second wall being adjacent to at least a part of the first groove, and the second wall being inclined toward the first groove from the first wall to form a flow path for an electrolyte solution from the first wall to the first groove.

2 . The battery according to claim 1 , wherein the battery comprises a plurality of the battery cells, the insulation piece is provided with a plurality of the first grooves, and the first wall of each battery cell is disposed opposite to at least one first groove.

3 . The battery according to claim 1 , wherein at least two first grooves are disposed corresponding to the first wall, and the at least two first grooves comprise two first grooves disposed corresponding to diagonal corners of the first wall respectively.

4 . The battery according to claim 3 , wherein at least four first grooves are disposed corresponding to the first wall, and the at least four first grooves comprise four first grooves disposed corresponding to two pairs of diagonal corners of the first wall respectively.

5 . The battery according to claim 1 , wherein the first groove comprises a first drain hole, and the first drain hole runs through a bottom wall of the first groove.

6 . The battery according to claim 5 , wherein the first groove comprises a first sidewall extending along a first direction and a second sidewall extending along a second direction, the first sidewall is connected to the second sidewall, and both the first sidewall and the second sidewall are connected to an outer periphery of the bottom wall of the first groove;
a dimension of the first sidewall along a thickness direction of the first wall is h 1 , and a minimum distance between an edge of the first drain hole and the first sidewall along the second direction is w 1 , satisfying: w 1 ≤5.67h 1 ; and/or, a dimension of the second sidewall along a thickness direction of the first wall is h 2 , and a minimum distance between an edge of the first drain hole and the second sidewall along the first direction is w 2 , satisfying: w 2 ≤2.74h 2 ; and the first direction, the second direction, and the thickness direction of the first wall intersect each other.

7 . The battery according to claim 5 , wherein the first groove comprises a plurality of the first drain holes, and the plurality of the first drain holes are spaced apart.

8 . The battery according to claim 5 , wherein at least one first drain hole is disposed at a corner of the first groove.

9 . The battery according to claim 1 , wherein the insulation piece further comprises a guide groove, and the guide groove is connected to the first groove.

10 . The battery according to claim 9 , wherein the battery cell further comprises a pressure relief mechanism, the pressure relief mechanism is disposed on the first wall, and an orthographic projection of the pressure relief mechanism on the insulation piece along a thickness direction of the first wall at least partially lies within the guide groove.

11 . The battery according to claim 10 , wherein, along the thickness direction of the first wall, the orthographic projection of the pressure relief mechanism on the insulation piece lies within the guide groove, and a minimum distance between an edge of the orthographic projection of the pressure relief mechanism on the insulation piece and a sidewall of the guide groove is a, and, along the thickness direction of the first wall, a minimum distance between the pressure relief mechanism and the guide groove is h 3 , satisfying: a≥0.36h 3 .

12 . The battery according to claim 9 , wherein the guide groove is recessed along a direction facing away from the first wall, and, along a thickness direction of the first wall, a dimension of the guide groove is less than or equal to a dimension of the first groove.

13 . The battery according to claim 9 , wherein the first wall comprises an injection port, the injection port is configured to inject an electrolyte solution into the shell, and, along a thickness direction of the first wall, an orthographic projection of the injection port on the insulation piece at least partially lies within the guide groove.

14 . The battery according to claim 1 , wherein the battery cell further comprises a pressure relief mechanism, the pressure relief mechanism is disposed on the first wall, the insulation piece comprises a second groove recessed along a direction facing away from the first wall, and an orthographic projection of the pressure relief mechanism on the insulation piece along a thickness direction of the first wall at least partially lies within the second groove;
wherein the second groove comprises a second drain hole, and the second drain hole runs through a bottom wall of the second groove; and wherein the insulation piece further comprises a communicating channel, and the communicating channel connects the first groove and the second groove.

15 . The battery according to claim 1 , wherein the battery comprises a plurality of the battery cells, the plurality of battery cells are arranged along a first direction, the insulation piece comprises at least one first blocking protrusion, the first blocking protrusion extends along a second direction and is located on one side, close to the first wall, of the insulation piece, the second direction intersects the first direction, and the first blocking protrusion is located between two first grooves corresponding to the first walls of two battery cells adjacent to each other along the first direction,
wherein a plurality of the battery cells are arranged in a matrix along the first direction and the second direction, the insulation piece comprises at least one second blocking protrusion, the second blocking protrusion extends along the first direction and is located on one side, close to the first wall, of the insulation piece, the second blocking protrusion intersects the first blocking protrusion, and the second blocking protrusion is located between two first grooves corresponding to the first walls of two battery cells adjacent to each other along the second direction.

16 . The battery according to claim 1 , wherein the battery comprises a plurality of the battery cells, and the plurality of the battery cells are arranged in a matrix along a first direction and a second direction, and the first direction intersects the second direction; and
the battery further comprises at least one insulation spacer, the insulation spacer extends along the first direction, and the insulation spacer is disposed between two busbars adjacent to each other along the second direction; wherein the insulation spacer abuts the first wall of the battery cell and/or the insulation piece.

17 . The battery according to claim 16 , wherein the insulation spacer abuts the first walls of two battery cells adjacent to each other along the second direction.

18 . The battery according to claim 16 , w

Assignees

• Contemporary Amperex Technology Hong Kong Ltd

Inventors

• Long Chao
• Chen Xingdi
• Wang Peng

Classifications

• H01M50/588

  outside the batteries, e.g. incorrect connections of terminals or busbars · CPC title

• H01M50/627

  Filling ports · CPC title

• H01M50/3425

  in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member · CPC title

• H01M50/507

  comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules · CPC title

• H01M50/691

  Arrangements or processes for draining liquids from casings; Cleaning battery or cell casings · CPC title