Adsorption assembly and battery

Patent metadata

Field	Value
Publication number	US-11121416-B2
Application number	US-201816178397-A
Country	US
Kind code	B2
Filing date	Nov 1, 2018
Priority date	Jul 13, 2018
Publication date	Sep 14, 2021
Grant date	Sep 14, 2021

Abstract

An adsorption assembly and a battery are provided. The adsorption assembly includes: a housing including a gas permeable portion; and an adsorbent encapsulated by the housing. The adsorption assembly can effectively isolate the adsorbent from the external environment by providing the housing, thereby preventing the adsorption performance of the adsorbent from being affected, and the housing includes a gas permeable portion, which can make the produced gas in the external environment enter the housing and be effectively adsorbed by the adsorbent. In particular, when the adsorbent is used for a battery, especially a soft pack battery, the gas produced inside the battery can be effectively adsorbed to prevent liquid leakage of the battery seal caused by breakage of the battery seal by gas, improving reliability and safety of the battery and extending lifetime of the battery.

First claim

What is claimed is:

1. An adsorption assembly, comprising:
an adsorbent,
a housing forming a closed cavity for encapsulating the adsorbent,
wherein the closed cavity of the housing consists of a main housing member made of electrolyte resistant material and a gas permeable portion made of a gas permeable membrane and covering one and only one opening of the main housing member, external gas and internal gas of the adsorption assembly are exchanged only through the gas permeable portion; and
an outer surface of the gas permeable membrane is provided with an adhesive layer.

2. The adsorption assembly according to claim 1 , wherein the electrolyte resistant material comprises at least one selected from the group of polyethylene, polypropylene and polyethylene terephthalate.

3. The adsorption assembly according to claim 1 , wherein the adsorbent is encapsulated by the gas permeable portion.

4. The adsorption assembly according to claim 1 , wherein the shape of the housing is at least one selected from the group of a prism, a cylinder, a curved column, and a pocket.

5. The adsorption assembly according to claim 1 , wherein the thickness of the gas permeable membrane is between 40 and 150 microns.

6. The adsorption assembly according to claim 1 , wherein the gas permeable membrane satisfies at least one of the following conditions at a gas pressure of 7 KPa:
an air flow rate is greater than or equal to 300 mL/min/cm 2 ;
a hydrostatic pressure is greater than or equal to 90 KPa;
an oleophobic level is greater than or equal to 7.

7. The adsorption assembly according to claim 1 , wherein a material of the gas permeable membrane comprises at least one of a modified polytetrafluoroethylene and a modified polyethylene.

8. The adsorption assembly according to claim 1 , wherein the gas permeable membrane comprises at least one of an expanded polytetrafluoroethylene microporous membrane and a stretched polyethylene microporous membrane.

9. The adsorption assembly according to claim 1 , wherein the adsorbent comprises a molecular sieve capable of adsorbing carbon monoxide or carbon dioxide.

10. The adsorption assembly according to claim 9 , wherein the adsorbent comprises at least one selected from the group of a 5A calcium ion type molecular sieve, a lithium type molecular sieve, a 5X type molecular sieve, and a 13X type molecular sieve.

11. A battery, comprising:
a packaging film;
a cell having a side surface;
an adsorption assembly having a pocket shape and including an adsorbent and a housing, the housing encapsulating the adsorbent, and the housing consists of a main housing member made of electrolyte resistant material and a gas permeable portion made of a gas permeable membrane and covering one and only one opening of the main housing member, external gas and internal gas of the adsorption assembly are exchanged only through the gas permeable portion;
wherein the adsorption assembly is disposed on at least one side of the cell, and the cell and the adsorption assembly are encapsulated by the packaging film;
an outer surface of the gas permeable membrane is provided with an adhesive layer; and
the adsorption assembly adheres to the side surface of the cell by the adhesive layer.

12. The battery according to claim 11 , wherein the adsorbent is encapsulated by the gas permeable portion.

13. The battery according to claim 11 , wherein the thickness of the gas permeable membrane is between 40 and 150 microns.

14. The battery according to claim 11 , wherein the gas permeable membrane satisfies at least one of the following conditions at a gas pressure of 7 KPa:
an air flow rate is greater than or equal to 300 mL/min/cm 2 ;
a hydrostatic pressure is greater than or equal to 90 KPa;
an oleophobic level is greater than or equal to 7.

15. A battery, comprising an adsorption assembly, wherein the adsorption assembly includes:
an adsorbent,
a housing forming a closed cavity for encapsulating the adsorbent,
wherein the closed cavity of the housing consists of a main housing member made of electrolyte resistant material and a gas permeable portion made of a gas permeable membrane and covering one and only one opening of the main housing member, external gas and internal gas of the adsorption assembly are exchanged only through the gas permeable portion; and
an outer surface of the gas permeable membrane is provided with an adhesive layer.

Assignees

• Ningde Amperex Technology Ltd

Inventors

• Guo Qiang
• Chen Yu
• Han Pei

Classifications

• H01M50/107

  having curved cross-section, e.g. round or elliptic (H01M50/103, H01M50/109, H01M50/11 take precedence) · CPC title

• H01M50/105

  Pouches or flexible bags · CPC title

• H01M50/103

  prismatic or rectangular (H01M50/109, H01M50/11 take precedence) · CPC title

• H01M6/50

  Methods or arrangements for servicing or maintenance, e.g. for maintaining operating temperature (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• H01M50/121

  Organic material · CPC title