Battery cell comprising protection circuit module assembly having lead plate

Patent metadata

Field	Value
Publication number	US-10658708-B2
Application number	US-201715812343-A
Country	US
Kind code	B2
Filing date	Nov 14, 2017
Priority date	Nov 2, 2016
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

Provided is a plate-shaped battery cell in which electrode leads are located at one side end portion of a battery case including an excess sealing portion of a thermally-welded or adhesive structure for sealing an electrode assembly. the battery cell includes: a Protection Circuit Module (PCM) assembly having one or more safety elements for preventing overcurrent, wherein the PCM assembly includes a PCM and a conductive lead plate for electrically connecting the electrode leads, wherein the lead plate includes: an electrode lead connection portion positioned at one side end portion of the lead plate for electrically connecting the PCM and the electrode lead; a PCM connection portion located at the other side end portion of the lead plate for connecting to a connection portion of a printed circuit board on which a protection circuit is formed; and a bent portion extending from the electrode lead connection portion to be bent to face the outer surface of the battery case in order to prevent damage to the battery case occurring during a process of connecting the electrode lead to the electrode lead connecting portion.

First claim

What is claimed is:

1. A plate-shaped battery cell in which an electrode lead is located at one side end portion of a battery case including an excess sealing portion of a thermally-welded or adhesive structure for sealing an electrode assembly, the battery cell comprising:
a Protection Circuit Module (PCM) assembly having one or more safety elements for preventing overcurrent,
wherein the PCM assembly comprises a Protection Circuit Module (PCM) and a conductive lead plate for electrically connecting the electrode lead,
wherein the conductive lead plate comprises:
an electrode lead connection portion positioned at one side end portion of the conductive lead plate for electrically connecting the PCM and the electrode lead;
a PCM connection portion located at the other side end portion of the conductive lead plate for connecting to a connection portion of a printed circuit board on which a protection circuit is formed; and
a bent portion extending from the electrode lead connection portion to be bent to face the outer surface of the battery case in order to prevent damage to the battery case occurring during a process of connecting the electrode lead to the electrode lead connecting portion,
wherein the electrode lead connection portion, the PCM connection portion, and the bent portion of the conductive lead plate are all conductive, and
wherein the flat thickness of the bent portion is relatively thinner than the thickness of the electrode lead.

2. The battery cell of claim 1 , wherein the plate-shaped battery cell has a structure in which the electrode assembly is sealed in a pouch-shaped battery case of a laminate sheet including a resin layer and a metal layer.

3. The battery cell of claim 1 , wherein the excess sealing portion is a sealing portion formed by a heat welding of the battery case.

4. The battery cell of claim 1 , wherein the conductive lead plate comprises a main body portion formed of a strip-shaped flat plate.

5. The battery cell of claim 4 , wherein the electrode lead connection portion extends from the main body portion of the conductive lead plate and has an L shape on a plane.

6. The battery cell of claim 4 , wherein the main body portion of the conductive lead plate is formed with an inclined portion to form a height difference with respect to the ground.

7. The battery cell of claim 1 , wherein the bent portion extends from the electrode lead connection portion in a direction in which a reception portion receiving the electrode assembly of the battery case is located,
wherein the reception portion is disposed angled to the excess sealing portion.

8. The battery cell of claim 7 , wherein the bent portion is bent in a shape corresponding to one side wall portion of the reception portion of the battery case.

9. The battery cell of claim 1 , wherein the electrode lead is bent at least once so as to be connected to face the electrode lead connection portion of the conductive lead plate.

10. The battery cell of claim 1 , wherein an insulating film is coated on the remaining portion of the conductive lead plate except for the electrode lead connection portion, the PCM connection portion, and the bent portion.

11. The battery cell of claim 10 , wherein the insulating film is made of polyimide resin.

12. The battery cell of claim 1 , wherein the end edges of the bent portion are formed in a rounding structure.

13. The battery cell of claim 1 , wherein the width of the bent portion is relatively larger than the width of the electrode lead with respect to a direction extending from the electrode lead connection portion.

14. The battery cell of claim 1 , wherein an insulating film is coated on the bent portion.

15. The battery cell of claim 1 , wherein an insulating tape is interposed at an interface portion between the conductive lead plate and the battery case.

16. A battery pack comprising at least one battery cell according to claim 1 .

17. The battery cell of claim 7 , wherein the reception portion is disposed perpendicular to the excess sealing portion.

18. The battery cell of claim 7 , wherein the bent portion is interposed between an end of the electrode lead and the reception portion.

Assignees

• Lg Chemical Ltd

Inventors

• Yang Jin Oh
• Son Young Su
• Song Suk Jin
• Jang Jae Young

Classifications

• 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

• H01M2200/00

  Safety devices for primary or secondary batteries · CPC title

• H01M10/0525

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

• H01M2/30

  Electricity · mapped topic

• H01M2/0275

  Electricity · mapped topic