Secondary Battery and Battery Module

Patent metadata

Field	Value
Publication number	US-2021005872-A1
Application number	US-201916979355-A
Country	US
Kind code	A1
Filing date	Dec 6, 2019
Priority date	Feb 14, 2019
Publication date	Jan 7, 2021
Grant date	—

Abstract

A secondary battery includes an electrode assembly formed by alternately stacking an electrode and a separator; a battery case that accommodates the electrode assembly therein; a plurality of electrode tabs protruding from the electrode assembly; a plurality of electrode leads, each of which has one end connected to one of the plurality of electrode tabs and another end protruding to an outside of the battery case; and a short-circuit induction part which has a wire shape, wherein ends of the short-circuit induction part are respectively disposed on a sealing part of the battery case that seals the plurality of electrode leads in the battery case, and wherein the ends of the short-circuit induction part are configured to respectively extend toward the plurality of electrode leads to contact the plurality of electrode leads when reaching a specific temperature.

First claim

1 . A secondary battery comprising:
an electrode assembly formed by alternately stacking an electrode and a separator; a battery case that accommodates the electrode assembly therein; a plurality of electrode tabs protruding from the electrode assembly; a plurality of electrode leads, each of which has one end connected to one of the plurality of electrode tabs and another end protruding to an outside of the battery case; and a short-circuit induction part which has a wire shape, wherein ends of the short-circuit induction part are respectively disposed on a sealing part of the battery case that seals the plurality of electrode leads in the battery case, and wherein the ends of the short-circuit induction part are configured to respectively extend toward the plurality of electrode leads to contact the plurality of electrode leads when reaching a specific temperature.

2 . The secondary battery of claim 1 , wherein the short-circuit induction part is made of a shape memory alloy.

3 . The secondary battery of claim 1 , wherein the short-circuit induction part is formed in contact with the sealing part of the battery case.

4 . The secondary battery of claim 3 , wherein, when the plurality of electrode leads are formed in an opposite direction of the electrode assembly, the short-circuit induction part is formed in contact with a portion of the sealing part formed along a peripheral edge in the battery case.

5 . The secondary battery of claim 1 , wherein the short-circuit induction part is formed along an outer surface of a cup part of the battery case that accommodates the electrode assembly.

6 . The secondary battery of claim 1 , wherein when reaching the specific temperature, both the ends of the short-circuit induction part are configured to be separated from the sealing part to extend and to be bent toward the electrode leads, respectively.

7 . A battery module comprising:
a secondary battery comprising an electrode assembly formed by alternately stacking an electrode and a separator, a battery case that accommodates the electrode assembly therein, a plurality of electrode tabs protruding from the electrode assembly, a plurality of electrode leads, each of which has one end connected to one of the plurality of electrode tabs and another end protruding to an outside of the battery case, and a short-circuit induction part, wherein ends of the short-circuit induction part are respectively disposed on a sealing part of the battery case that seals the plurality of electrode leads in the battery case, wherein the ends of the short-circuit induction part are configured to respectively extend toward the plurality of electrode leads to contact the plurality of electrode leads when reaching a specific temperature; and a housing accommodating the secondary battery therein.

8 . The battery module of claim 7 , wherein the short-circuit induction part is made of a shape memory alloy.

9 . The battery module of claim 7 , wherein the short-circuit induction part is formed in contact with an edge of an inner space of the housing.

10 . The battery module of claim 7 , wherein when reaching the specific temperature, both the ends of the short-circuit induction part are configured to be separated from the sealing part to extend and to be bent toward the electrode leads, respectively.

11 . A battery pack comprising the battery module of claim 7 .

12 . A device comprising the battery pack of claim 11 .

Assignees

• Lg Chemical Ltd

Inventors

• Lee Han Young
• Lee Ji Su

Classifications

• H01M50/531

  Electrode connections inside a battery casing · CPC title

• H01M50/548

  on opposite sides of the cell · CPC title

• H01M50/586

  inside the batteries, e.g. incorrect connections of electrodes · CPC title

• H01M50/178

  for pouch or flexible bag cells · CPC title

• H01M50/105 Primary

  Pouches or flexible bags · CPC title