Battery cell, battery and electric device

Patent metadata

Field	Value
Publication number	US-2026038917-A1
Application number	US-202519356199-A
Country	US
Kind code	A1
Filing date	Oct 13, 2025
Priority date	Dec 14, 2023
Publication date	Feb 5, 2026
Grant date	—

Abstract

A battery cell, a battery, and an electric device. The battery cell includes a case. A pressure relief mechanism is provided on a first wall portion. An electrode assembly is accommodated in the case and includes at least one negative electrode sheet with an active material layer on at least one side. In a second direction, the first wall portion faces an edge of the negative electrode sheet, and the minimum distance D between the pressure relief mechanism and the edge of the active material layer is 3 mm to 15 mm. Based on the total mass of the active material layer, the proportion S of active material is 0.5% to 25%. In a first direction, the minimum distance d between an edge of the pressure relief mechanism and an outer surface of the second or third wall portion is 3 mm to 20 mm.

First claim

What is claimed is:

1 . A battery cell, comprising:
a housing comprising a first wall part, a second wall part, and a third wall part, wherein the second wall part and the third wall part are arranged opposite to each other in a first direction, and two ends of the first wall part in the first direction are respectively connected to the second wall part and the third wall part; a pressure relief mechanism arranged on the first wall part and configured to be able to relieve pressure inside the battery cell; and an electrode assembly accommodated in the housing, wherein the electrode assembly comprises at least one negative electrode plate, an active material layer is formed on at least one side of the negative electrode plate, the active material layer comprises an active material, and in a second direction, the first wall part is arranged facing an edge of the negative electrode plate, and the second direction is a thickness direction of the first wall part and is perpendicular to the first direction; wherein in the second direction, a minimum distance between the pressure relief mechanism and an edge of the active material layer is D, and 3 mm≤D≤15 mm; based on a total mass of the active material layer, a mass proportion of the active material is S, and 0.5%≤S≤25%; in the first direction, a minimum distance between an edge of the pressure relief mechanism and an outer surface of the second wall part or an outer surface of the third wall part is d, and 3 mm≤d≤20 mm.

2 . The battery cell according to claim 1 , wherein 3 mm≤D≤10 mm, and 5%≤S≤15%, wherein D/S>20 mm.

3 . The battery cell according to claim 1 , wherein 2 mm≤D≤10 mm, and 5 mm≤d≤15 mm, wherein 10 mm 2 ≤D×d≤150 mm 2 .

4 . The battery cell according to claim 1 , wherein the active material comprises an expandable element, and the expandable element comprises at least one of silicon or graphite.

5 . The battery cell according to claim 1 , wherein the pressure relief mechanism is integrally formed with the first wall part.

6 . The battery cell according to claim 5 , wherein the first wall part comprises a weakened zone and a non-weakened zone, the weakened zone is arranged along the edge of the pressure relief mechanism and connects the pressure relief mechanism and the non-weakened zone, and the weakened zone is configured to crack when pressure of the battery cell is relieved.

7 . The battery cell according to claim 6 , wherein the first wall part is provided with a score groove, and the weakened zone is formed in the first wall part at an area where the score groove is provided.

8 . The battery cell according to claim 7 , wherein the score groove is a groove extending along a closed trajectory.

9 . The battery cell according to claim 1 , wherein the pressure relief mechanism is arranged separately from the first wall part, the first wall part is provided with a through hole, and the pressure relief mechanism is mounted in the through hole.

10 . The battery cell according to claim 1 , wherein in the first direction, a thickness of the battery cell is W 1 , a width of the pressure relief mechanism is W 2 , and the following condition is satisfied: 0.2≤W 2 /W 1 ≤0.5.

11 . The battery cell according to claim 1 , wherein in the first direction, the width of the pressure relief mechanism is W 2 ; in a third direction, a length of the pressure relief mechanism is W 3 , and the following condition is satisfied: 0.5≤W 2 /W 3 ≤0.8, wherein the third direction is perpendicular to the second direction.

12 . The battery cell according to claim 1 , wherein the housing further comprises a fourth wall part; the first wall part, the second wall part, the fourth wall part, and the third wall part are connected end to end in sequence, and the fourth wall part and the first wall part are arranged opposite to each other in the second direction.

13 . The battery cell according to claim 12 , wherein in the second direction, a distance between the first wall part and the fourth wall part is L 1 ; in the first direction, a distance between the second wall part and the third wall part is L 2 , and the following condition is satisfied: L 1 >L 2 .

14 . The battery cell according to claim 1 , wherein the electrode assembly further comprises at least one positive electrode plate, a polarity of the positive electrode plate is opposite to that of the negative electrode plate, and the positive electrode plate and the negative electrode plate are arranged in a stacked manner, wherein the positive electrode plate comprises a positive electrode current collector and a positive electrode active substance zone arranged on a surface of the positive electrode current collector, and a constituent material of the positive electrode current collector comprises an aluminum element with a mass percentage greater than or equal to 50%.

15 . The battery cell according to claim 1 , wherein the electrode assembly further comprises at least one positive electrode plate, a polarity of the positive electrode plate is opposite to that of the negative electrode plate, and the positive electrode plate and the negative electrode plate are arranged in a winding manner.

16 . The battery cell according to claim 1 , wherein the housing comprises a housing body and an end cover, at least one side of the housing body is provided with an opening, the end cover is connected to the housing body and is configured to close the opening, and the first wall part is formed in the housing body, wherein two opposite sides of the housing body are each provided with an opening, and two end covers are configured to close the openings on corresponding sides, wherein the end cover is provided with an electrical connection part, and the electrical connection part is electrically connected to a positive electrode plate, or the electrical connection part is electrically connected to the negative electrode plate.

17 . The battery cell according to claim 1 , wherein the first wall part is configured to support the electrode assembly and is located below the electrode assembly.

18 . The battery cell according to claim 1 , wherein a material of the housing comprises at least one of aluminum, nickel-plated carbon steel, stainless steel, a magnesium alloy, a nickel alloy, a copper alloy, and a zirconium alloy.

19 . A battery, comprising the battery cell according to claim 1 .

20 . An electric device, comprising the battery according to claim 19 .

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Zheng Donglai
• Shi Dongyang
• Ma Hao

Classifications

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• B60L50/64

  Constructional details of batteries specially adapted for electric vehicles · 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

• H01M50/15

  for prismatic or rectangular cells (H01M50/153 takes precedence) · CPC title

• H01M50/119

  Metals · CPC title