Battery, power consumption device, method and device for preparing a battery

Patent metadata

Field	Value
Publication number	US-2022013853-A1
Application number	US-202017113038-A
Country	US
Kind code	A1
Filing date	Dec 5, 2020
Priority date	Jul 10, 2020
Publication date	Jan 13, 2022
Grant date	—

Abstract

Embodiments of the present application provide a battery. The battery includes: a battery cell comprising a pressure relief mechanism, the pressure relief mechanism being arranged in a first wall of the battery cell and the pressure relief mechanism being configured, when an internal pressure or temperature of the battery cell reaches a threshold, to be actuated to release the internal pressure; and a thermal management component for containing a fluid to adjust the temperature of the battery cell; wherein a first surface of the thermal management component is attached to the first wall, and the thermal management component is configured to be capable of being damaged when the pressure relief mechanism is actuated, so that the fluid is discharged from inside of the thermal management component. According to the technical solutions of the embodiments of the present application, the safety of the battery can be enhanced.

First claim

What is claimed is:

1 . A battery, comprising:
a battery cell comprising a pressure relief mechanism, the pressure relief mechanism being arranged in a first wall of the battery cell, and the pressure relief mechanism being configured, when an internal pressure or temperature of the battery cell reaches a threshold, to be actuated to release the internal pressure; and a thermal management component for containing a fluid to adjust a temperature of the battery cell; wherein a first surface of the thermal management component is attached to the first wall, and the thermal management component is configured to be capable of being damaged when the pressure relief mechanism is actuated, so that the fluid is discharged from inside of the thermal management component.

2 . The battery according to claim 1 , wherein the thermal management component is configured to be damaged by emissions discharged from the battery cell when the pressure relief mechanism is actuated, so that the emissions pass through the thermal management component.

3 . The battery according to claim 1 , wherein the thermal management component is provided with a recess therein, and a side surface of the recess is configured to be capable of being damaged by emissions discharged from the battery cell, so that the fluid is discharged from the inside of the thermal management component.

4 . The battery according to claim 3 , wherein a bottom wall of the recess is configured to be capable of being damaged by the emissions when the pressure relief mechanism is actuated, so that the emissions pass through the thermal management component.

5 . The battery according to claim 3 , wherein the side surface of the recess is configured to be capable of being broken through and/or melted by the emissions, so that the fluid is discharged from the inside of the thermal management component; and
a bottom wall of the recess is configured to be capable of being broken through and/or melted by the emissions, so that the emissions pass through the thermal management component; and a radial dimension of the recess gradually decreases in a direction away from the pressure relief mechanism.

6 . The battery according to claim 3 , wherein a bottom wall of the recess is provided with a weakened zone, the weakened zone being configured to be capable of being damaged by the emissions when the pressure relief mechanism is actuated, so that the emissions pass through the weakened zone; and
the weakened zone has a thickness less than or equal to 3 mm.

7 . The battery according to claim 6 , wherein the weakened zone has a lower melting point than the rest of the thermal management component; and
the material of the weakened zone has a melting point below 400° C.

8 . The battery according to claim 3 , wherein the recess is provided in the first surface; and the thermal management component comprises a first thermally conductive plate and a second thermally conductive plate, the first thermally conductive plate is located between the first wall and the second thermally conductive plate and attached to the first wall, a first region of the first thermally conductive plate is recessed toward the second thermally conductive plate to form the recess, and the first region is connected to the second thermally conductive plate.

9 . The battery according to claim 8 , wherein the first region is provided with a first through hole, and a radial dimension of the first through hole is smaller than that of the recess; and a thickness of the second thermally conductive plate corresponding to the first through hole is smaller than that of the second thermally conductive plate in other regions.

10 . The battery according to claim 3 , wherein the recess is configured as an avoidance chamber for enabling the pressure relief mechanism to be opened when the pressure relief mechanism is actuated; and
a depth of the recess is related to a size of the pressure relief mechanism and the recess has a depth greater than 1 mm; and an area of an opening of the recess is related to an area of the pressure relief mechanism, and a ratio of the area of the opening of the recess to the area of the pressure relief mechanism ranges from 0.5 to 2.

11 . The battery according to claim 10 , wherein at least a portion of the pressure relief mechanism protrudes outward from the first wall, and the avoidance chamber is configured to accommodate the at least portion of the pressure relief mechanism.

12 . The battery according to claim 10 , wherein a portion of the first wall around the pressure relief mechanism protrudes outward, and the avoidance chamber is configured to accommodate an outward protruding portion of the first wall around the pressure relief mechanism.

13 . The battery according to claim 1 , wherein the thermal management component is provided with a second through hole therein, the second through hole being configured such that emissions discharged from the battery cell can pass through the thermal management component via the second through hole when the pressure relief mechanism is actuated.

14 . The battery according to claim 13 , wherein a hole wall of the second through hole is configured to be capable of being damaged by the emissions, so that the fluid is discharged from the inside of the thermal management component.

15 . The battery according to claim 14 , wherein the hole wall of the second through hole is configured to be capable of being broken through and/or melted by the emissions, so that the fluid is discharged from the inside of the thermal management component.

16 . The battery according to claim 13 , wherein a radial dimension of the second through hole gradually decreases in a direction away from the pressure relief mechanism; and
an area of an opening of the second through hole is related to an area of the pressure relief mechanism, and a ratio of the area of the opening of the second through hole to the area of the pressure relief mechanism ranges from 0.5 to 2.

17 . The battery according to claim 13 , wherein at least a portion of the pressure relief mechanism protrudes from the first wall, and the second through hole is used to accommodate the at least portion of the pressure relief mechanism.

18 . The battery according to claim 13 , wherein a portion of the first wall around the pressure relief mechanism protrudes outward, and the second through hole is used to accommodate an outward protruding portion of the first wall around the pressure relief mechanism;
and the pressure relief mechanism is provided with a breaking device, the breaking device being used to damage the thermal management component when the pressure relief mechanism is actuated, so that the fluid is discharged from the inside of the thermal management component; wherein the breaking device is a spike.

19 . The battery according to claim 1 , further comprising:
an electrical chamber for accommodating a plurality of the battery cells; and a collection chamber for collecting emissions discharged from the battery cells and emissions from the thermal management component when the pressure relief mechanism is actuated; wherein the thermal management component is configured to isolate the electrical chamber from the collection chamber, and the thermal management component has a wall shared by the electrical chamber and the collection chamber; and the thermal management component is configured to enable the emissions discharged from the battery cell to pass through the thermal management component and enter

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Zeng Yuqun
• Chen Xiaobo
• Wang Peng
• Li Yao
• Lin Yongshou

Classifications

• H01M50/367

  Internal gas exhaust passages forming part of the battery cover or case; Double cover vent systems · CPC title

• H01M50/609

  Arrangements or processes for filling with liquid, e.g. electrolytes · CPC title

• H01M50/375 Primary

  Vent means sensitive to or responsive to temperature · CPC title

• H01M50/358

  External gas exhaust passages located on the battery cover or case · CPC title

• H01M50/342

  Non-re-sealable arrangements · CPC title