Battery Cell and Battery System Including the Same

Patent metadata

Field	Value
Publication number	US-2022416314-A1
Application number	US-202117787618-A
Country	US
Kind code	A1
Filing date	Apr 21, 2021
Priority date	May 13, 2020
Publication date	Dec 29, 2022
Grant date	—

Abstract

A battery cell includes: an electrode assembly; a case configured to accommodate the electrode assembly; a first lead electrode electrically connected to at least one of two electrode tabs of the electrode assembly; a conductive polymer including one surface that is in contact with one surface of the first lead electrode; and a second lead electrode including one surface that is in contact with the other surface of the conductive polymer, in which when a gap between the first lead electrode and the second lead electrode increases, resistance between the first lead electrode and the second lead electrode increases.

First claim

1 . A battery cell, comprising:
an electrode assembly; a case configured to accommodate the electrode assembly; a first lead electrode electrically connected to at least one of two electrode tabs of the electrode assembly; a conductive polymer including a first surface that is in contact with a first surface of the first lead electrode; and a second lead electrode including a first surface that is in contact with a second surface of the conductive polymer, wherein the first lead electrode and the second lead electrode are positioned such that an increase a gap between the first lead electrode and the second lead electrode corresponds to an increase in resistance between the first lead electrode and the second lead electrode.

2 . The battery cell of claim 1 , further comprising:
a film configured to surround a region including a portion in which the first lead electrode, the conductive polymer, and the second lead electrode overlap.

3 . The battery cell of claim 1 , wherein:
the second lead electrode protrudes to an exterior of the case and is connected to a bus bar.

4 . A battery system, comprising:
a plurality of battery cells; and a battery management system, wherein each of the a plurality of battery cells includes: an electrode assembly; a case configured to accommodate the electrode assembly; a first lead electrode electrically connected to at least one of two electrode tabs of the electrode assembly; a conductive polymer including a first surface that is in contact with a first surface of the first lead electrode; and a second lead electrode including a first surface that is in contact with a second surface of the conductive polymer, wherein the battery management system is configured to:
detect an increase in resistance of at least one of the plurality of battery cells; and
diagnose an abnormality based on the detected increase in resistance.

5 . The battery management system of claim 4 , wherein:
the battery management system is configured to generate an inspection signal in response to a resistance increase speed of at least one of the plurality of battery cells reaching a predetermined threshold value that is equal to or smaller than a first reference value.

6 . The battery management system of claim 5 , wherein:
the battery management system is configured to generate a warning signal in response to the resistance increase speed of at least one of the plurality of battery cells reaching the predetermined threshold value at a higher speed than the first reference value.

7 . The battery management system of claim 5 , wherein:
the battery management system is configured to generate an evacuation warning signal in response to the resistance increase speed of at least one of the plurality of battery cells reaching the predetermined threshold value by a second reference value or more that is larger than the first reference value.

8 . The battery management system of claim 4 , wherein:
each of the plurality of battery cells further includes a film configured to surround a region including a portion in which the first lead electrode, the conductive polymer, and the second lead electrode overlap.

9 . The battery management system of claim 4 , wherein:
the second lead electrode protrudes to an exterior of the case and is connected to a bus bar.

10 . The battery management system of claim 4 , wherein:
the battery management system is configured to: supply a diagnosis voltage to both ends of at least one of the plurality of battery cells; measure a diagnosis current flowing in said at least one of the plurality of battery cells; and
calculate a resistance of said at least one of the plurality of battery cells.

Assignees

• Lg Energy Solution Ltd

Inventors

• Park Jong Pil

Classifications

• H01M2010/4271

  Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing · CPC title

• H01M10/482 Primary

  for several batteries or cells simultaneously or sequentially · CPC title

• H01M10/425 Primary

  Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00) · CPC title

• H01M50/533

  characterised by the shape of the leads or tabs · CPC title

• H01M50/572

  Means for preventing undesired use or discharge · CPC title