Battery pack

Patent metadata

Field	Value
Publication number	US-2017244082-A1
Application number	US-201615351120-A
Country	US
Kind code	A1
Filing date	Nov 14, 2016
Priority date	Feb 19, 2016
Publication date	Aug 24, 2017
Grant date	—

Abstract

A battery pack includes a housing accommodating a battery cell and having a throughhole; and a pressure equalization device coupled to the throughhole and equalizing internal and external pressures of the housing, wherein the pressure equalization device includes a first pressure equalization member configured to equalize the internal and external pressures of the housing when a variation in the internal pressure of the housing is smaller than a reference pressure variation; and a second pressure equalization member configured to equalize the internal and external pressures of the housing when the variation in the internal pressure of the housing is greater than the reference pressure variation.

First claim

What is claimed is:

1 . A battery pack comprising:
a housing accommodating a battery cell and having a throughhole; and a pressure equalization device coupled to the throughhole and equalizing internal and external pressures of the housing, wherein the pressure equalization device comprises: a first pressure equalization member configured to equalize the internal and external pressures of the housing when a variation in the internal pressure of the housing is smaller than a reference pressure variation; and a second pressure equalization member configured to equalize the internal and external pressures of the housing when the variation in the internal pressure of the housing is greater than the reference pressure variation.

2 . The battery pack of claim 1 , wherein the first pressure equalization member and the second pressure equalization member are integrally formed with each other.

3 . The battery pack of claim 2 , wherein the pressure equalization device comprises:
an inner body connected to the throughhole; and an elastic member positioned inside the inner body, wherein the first pressure equalization member is located between the inner body and the elastic member, and wherein the second pressure equalization device extends from the first pressure equalization member to be coupled to the elastic member.

4 . The battery pack of claim 3 , wherein the first pressure equalization member is configured to close the throughhole when the variation in the internal pressure of the housing is smaller than the reference pressure variation, and wherein the second pressure equalization member is configured to open the throughhole when the variation in the internal pressure of the housing is greater than the reference pressure variation.

5 . The battery pack of claim 3 , wherein the first pressure equalization member is made of an air permeable material.

6 . The battery pack of claim 3 , wherein the inner body is coupled to an outer body.

7 . The battery pack of claim 1 , wherein the first pressure equalization member and the second pressure equalization member are separately formed from each other.

8 . The battery pack of claim 7 , wherein the pressure equalization device includes an outer body, a connection plate extending to an inside of the outer body, and an upper protrusion upwardly extending from the connection plate and connected to the throughhole, wherein the first pressure equalization member is coupled to the connection plate, and wherein the second pressure equalization member is coupled to the upper protrusion.

9 . The battery pack of claim 8 , further comprising:
an inner body coupled to the upper protrusion and connected to the throughhole; and an elastic member positioned inside the inner body, wherein the second pressure equalization member is coupled between the inner body and the elastic member.

10 . The battery pack of claim 9 , wherein the first and second pressure equalization members are configured to close the throughhole when the variation in the internal pressure of the housing is smaller than the reference pressure variation, and wherein the second pressure equalization member is configured to open the throughhole when the variation in the internal pressure of the housing is greater than the reference pressure variation.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Ahn Sanghyeok
• Lee Daehun
• Kim Heonhee

Classifications

• H01M2200/20

  Pressure-sensitive devices · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M2220/20

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

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title