Battery cell having improved insulation performance of electrode lead while having excellent manufacturing processability based on standardized structure and battery pack including the same

Patent metadata

Field	Value
Publication number	US-10529959-B2
Application number	US-201715754404-A
Country	US
Kind code	B2
Filing date	Mar 24, 2017
Priority date	Apr 25, 2016
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

A battery cell has a structure in which outer peripheral portions of a battery case are sealed by thermal bonding in a state in which an electrode assembly is mounted together with an electrolyte in a battery case made of a laminate sheet, wherein a pair of electrode leads of the electrode assembly protrude outward from the battery case, and an insulating member is attached to each of the electrode leads in an area of at least 60% of a total area of the electrode leads that protrude outwardly.

First claim

The invention claimed is:

1. A battery cell comprising:
a battery case made of a laminate sheet and having outer peripheral portions that are sealed by thermal bonding:
an electrode assembly mounted together with an electrolyte in the battery case;
electrode leads of the electrode assembly, the electrode leads protruding outward from the battery case; and
an insulating member respectively attached to each electrode lead in an area of at least 60% of a total area of each electrode lead that protrudes outwardly from the battery case, the insulating member having a covered portion that is covered by the battery case and an exposed portion that is outside of the battery case,
wherein the insulating member includes an embossing structure on a surface of the exposed portion, the embossing structure including a plurality of protrusions integrated with insulating member, and wherein the plurality of protrusions are spaced apart at regular intervals in a direction protruding outward from the battery case.

2. The battery cell of claim 1 , wherein:
the battery case includes a case body in which an accommodation part is formed to accommodate the electrode assembly therein and a flat plate cover extended from one end portion of the case body or made of a member independent from the case body,
the flat plate cover forming an upper surface of the battery cell and the electrode leads protruding outwardly from the battery case in a shape in which the electrode leads and the flat plate cover form a straight line based on a cross section of the battery cell.

3. The battery cell of claim 1 , wherein:
the insulating member is an insulating film attached to both surfaces of each electrode lead.

4. The battery cell of claim 3 , wherein:
the insulating film protrudes outwardly from the battery case together with each electrode lead in a structure in which the insulating film partially encloses a surface of each electrode lead.

5. The battery cell of claim 4 , wherein:
the insulating film protrudes from the battery case at a length corresponding to 60 to 90% of the total length of each electrode lead that protrudes outwardly.

6. The battery cell of claim 5 , wherein:
a rest portion of the insulating film except for a portion of the insulating film protruding together with each electrode lead is thermally bonded to a contact surface of the battery case.

7. The battery cell of claim 3 , wherein:
the insulating film includes at least one polymer resin layer and an adhesive layer formed on one surface of the resin layer.

8. The battery cell of claim 7 , wherein:
the embossing structure is formed on the other surface of the polymer resin layer on which the adhesive layer is not formed.

9. The battery cell of claim 1 , wherein:
the plurality of protrusions maintain an interval between each electrode lead and an external object when coming in contact with the external object.

10. The battery cell of claim 4 , wherein:
each electrode lead is electrically connected to the outside through a rest portion of each electrode lead to which the insulating film is not attached.

11. The battery cell of claim 10 , wherein:
the battery cell includes at least one shape selected from,
(a) a shape in which only the rest portion of each electrode lead to which the insulating film is not attached is perpendicularly bent in a protrusion direction of each electrode lead,
(b) a shape in which each electrode lead is perpendicularly bent together with the insulating film, and
(c) a shape in which the rest portion of each electrode lead to which the insulating film is not attached and the insulating film form a straight line based on a cross section of the battery cell.

12. The battery cell of claim 1 , wherein:
the battery cell has:
a structure in which a pair of the electrode leads protrude in parallel with each other from the same outer peripheral portion of the battery case; or
a structure in which the pair of the electrode leads protrude from outer peripheral portions of the battery case opposing each other, respectively.

13. A battery pack including the battery cell of claim 1 ,
wherein n battery cells, n being greater or equal to 2 (n≥2), are connected at least one of in series and in parallel to each other,
wherein the battery cells are stacked upwardly based on a ground in a state in which electrode leads of battery cells different from each other are positioned in parallel with each other in a vertical direction, and
among then battery cells, at least one pair of the battery cells are stacked so that upper surfaces thereof face each other, and among the electrode leads of the battery cells stacked so that the upper surfaces thereof face each other, in electrode leads that are not connected to each other, an insulation state is maintained by insulating films attached to the electrode leads that are not connected, respectively.

14. A device comprising at least one battery pack of claim 13 .

Assignees

• Lg Chemical Ltd

Inventors

• Lee Hyun Jong
• Kim Dong Hyun

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0436 Primary

  Small-sized flat cells or batteries for portable equipment · CPC title

• H01M10/0525 Primary

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

• H01M2220/30

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

• H01M10/058

  Construction or manufacture · CPC title