Battery cell, battery and power consumption apparatus

Patent metadata

Field	Value
Publication number	US-2023046770-A1
Application number	US-202217980591-A
Country	US
Kind code	A1
Filing date	Nov 4, 2022
Priority date	Jul 13, 2021
Publication date	Feb 16, 2023
Grant date	—

Abstract

The present application discloses a battery cell, a battery and a power consumption apparatus. The battery cell may include: a housing filled with an electrolyte inside; at least one core assembly arranged in the housing and at least one closed liquid bladder holding the electrolyte, the liquid bladder being arranged in the housing, and at least being provided corresponding to a side wall of the core assembly; at least one weakened structure being provided on the liquid bladder. Under a condition that a pressure in the liquid bladder reaches a threshold value, the electrolyte in the liquid bladder may break through the weakened structure and flow out of the liquid bladder.

First claim

1 . A battery cell, comprising:
a housing, the housing being filled with an electrolyte inside; at least one core assembly arranged in the housing; and at least one closed liquid bladder holding the electrolyte, the liquid bladder being arranged in the housing and at least being provided corresponding to a side wall of the core assembly; and at least one weakened structure being provided on the liquid bladder, wherein, under a condition that a pressure in the liquid bladder reaches a threshold value, the electrolyte in the liquid bladder breaks through the weakened structure and flows out of the liquid bladder.

2 . The battery cell according to claim 1 , wherein the side wall comprises a middle side wall portion located in a middle area of two end portions of the core assembly, and the liquid bladder is provided corresponding to the middle side wall portion.

3 . The battery cell according to claim 1 , wherein the liquid bladder is provided between the core assembly and the side wall of the housing, and/or, the liquid bladder is provided between adjacent core assemblies.

4 . The battery cell according to claim 1 , wherein at least one weakened structure is provided at at least part of an edge of the liquid bladder.

5 . The battery cell according to claim 4 , wherein a plurality of weakened structures are spaced apart at at least part of the edge of the liquid bladder.

6 . The battery cell according to claim 1 , wherein the battery cell comprises an upper end portion when in use, and at least one weakened structure is located on the liquid bladder closed to the upper end portion.

7 . The battery cell according to claim 1 , wherein the liquid bladder comprises at least one first liquid bladder and at least one second liquid bladder, and the first liquid bladder holds the electrolyte, the second liquid bladder does not hold the electrolyte, and the first liquid bladder and the second liquid bladder are isolated from each other in an initial state.

8 . The battery cell according to claim 7 , wherein the liquid bladder comprises a first weakened structure provided between the first liquid bladder and the second liquid bladder for isolating them from each other, and when a pressure in the first liquid bladder reaches a first threshold value, the electrolyte in the first liquid bladder breaks through the first weakened structure and flows into the second liquid bladder.

9 . The battery cell according to claim 7 , wherein a second weakened structure is further provided on the second liquid bladder, and when a pressure in the second liquid bladder reaches a second threshold value, the electrolyte in the second liquid bladder breaks through the second weakened structure and flows out of the second liquid bladder.

10 . The battery cell according to claim 7 , wherein at least one second liquid bladder is located in an area of two end portions of the core assembly.

11 . The battery cell according to claim 7 , wherein the second liquid bladder is located in an area not provided with a tab at an upper end portion of the core assembly.

12 . The battery cell according to claim 7 , wherein the liquid bladder further comprises at least one buffer bladder and a third weakened structure which are provided between the first liquid bladder and the second liquid bladder, a first weakened structure isolates the first liquid bladder and the buffer bladder, and the third weakened structure isolates the buffer bladder and the second liquid bladder, and when a pressure in the buffer bladder reaches a third threshold value, the electrolyte in the buffer bladder breaks through the third weakened structure and flows into the second liquid bladder.

13 . The battery cell according to claim 12 , wherein at least one buffer bladder is at least one channel spaced apart from each other, one end of each channel is provided with the first weakened structure, and an other end of each channel is provided with the third weakened structure.

14 . The battery cell according to claim 13 , wherein when the buffer bladder comprises a plurality of channels, a volume of each of the channels is same or different.

15 . The battery cell according to claim 8 , wherein
when the liquid bladder comprises a plurality of first weakened structures, the first threshold value of each first weakened structure is same or different; and/or when the liquid bladder comprises a plurality of second weakened structures, a second threshold value of each second weakened structure is same or different; and/or when the liquid bladder comprises a plurality of third weakened structures, a third threshold value of each third weakened structure is same or different.

16 . The battery cell according to claim 8 , wherein
the first weakened structure comprises at least one thinned area and/or at least one interlayer portion provided on the first liquid bladder; and/or the second weakened structure and a third weakened structure each independently comprises at least one thinned area and/or at least one interlayer portion provided on the second liquid bladder.

17 . The battery cell according to claim 8 , wherein the first threshold value, a second threshold value, and a third threshold value are each independently within a range between 0.1 MPa and 2.0 MPa.

18 . A battery, comprising: the battery cell according to claim 1 .

19 . A power consumption apparatus, the power consumption apparatus comprising the battery according to claim 18 , and the battery being configured to provide electrical energy.

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Xu Xiaofu
• Ye Yonghuang
• Liu Qian
• He Jianfu
• Sun Xueyang
• Sun Jingxuan
• Jin Haizu

Classifications

• H01M50/543

  Terminals · CPC title

• H01M50/664 Primary

  Temporary seals, e.g. for storage of instant batteries or seawater batteries · CPC title

• H01M2220/20

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

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M50/673

  Containers for storing liquids; Delivery conduits therefor · CPC title