Battery cell having dual welding structures

Patent metadata

Field	Value
Publication number	US-2019013506-A1
Application number	US-201716067844-A
Country	US
Kind code	A1
Filing date	Nov 24, 2017
Priority date	Nov 30, 2016
Publication date	Jan 10, 2019
Grant date	—

Abstract

The present disclosure provides a battery cell including: two or more electrode groups having a structure in which electrodes including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode are stacked, wherein each of the electrode groups includes an electrode tab junction on one side and is electrically connected to an electrode lead drawn to an outside of a battery case via a conductive connecting member, and has a structure including a first welding junction formed between one end of the conductive connecting member and the electrode tab junction and a second welding junction formed between the other end of the conductive connecting member and the electrode lead.

First claim

1 . A battery cell comprising:
two or more electrode groups having a structure in which electrodes including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode are stacked, wherein each of the electrode groups includes an electrode tab junction on one side and is electrically connected to an electrode lead drawn to an outside of a battery case via a conductive connecting member, and has a structure including a first welding junction formed between one end of the conductive connecting member and the electrode tab junction and a second welding junction formed between the other end of the conductive connecting member and the electrode lead.

2 . The battery cell of claim 1 , wherein the first welding junction and the second welding junction are formed parallel to the electrode lead.

3 . The battery cell of claim 1 , wherein the conductive connecting member has a bent part bent toward an electrode body or an opposite direction thereof between the first welding junction and the second welding junction.

4 . The battery cell of claim 3 , wherein the conductive connecting member is made of a metal strip, and the bent part is bent so as to have a circular arc shape in a vertical cross section.

5 . A battery cell comprising:
two or more electrode groups having a structure in which electrodes including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode are stacked, wherein each of the electrode groups includes an electrode tab junction on one side, and includes a first welding junction in which an end of the electrode tab junction is directly coupled to an electrode lead drawn to an outside of the battery case, and a second welding junction in which the conductive connecting member is coupled at an opposite position of the first welding junction to the electrode tab junction and the electrode lead.

6 . The battery cell of claim 5 , wherein the first welding junction has a structure in which a part of the electrode tab junction is coupled to the electrode lead in a bent state.

7 . The battery cell of claim 5 , wherein a size of the second welding junction is relatively larger than that of the first welding junction.

8 . The battery cell of claim 5 , wherein the conductive connecting member has a structure in which the second welding junction is formed to be in a bent state corresponding to the electrode tab junction and a shape of the outer surface of the electrode lead.

9 . The battery cell of claim 1 ,
wherein the electrode groups are composed of a first electrode group and a second electrode group, and the first electrode group and the second electrode group are arranged symmetrically with respect to the electrode lead.

10 . The battery cell of claim 9 , wherein, in the electrodes forming each of the electrode groups, bent angles of an electrode non-coated part extending from an end of an active material coated part to the electrode tab junction are symmetrical with respect to a horizontal axis passing through the center of the electrode group.

11 . The battery cell of claim 10 , wherein outermost electrodes of the electrode groups have a bent angle of about 20 to 50 degrees.

12 . The battery cell of claim 10 , wherein a part of the electrode tab junction is bent and coupled to the electrode lead in a state in which the bent angles of the electrode non-coated part are symmetrical with respect to the horizontal axis passing through the center of the electrode group.

13 . The battery cell of claim 1 , wherein upper and lower surfaces of the electrode lead have an insulating film attached thereto for securing electrical insulation in the battery case.

14 . The battery cell of claim 1 , wherein the electrode group is sealed together with an electrolytic solution within the battery case, which is made of a laminate sheet.

15 . The battery cell of claim 1 , wherein each of the electrode groups has a stacked type electrode group and a stacked/folding type electrode group.

16 . A device comprising the battery cell of claim 1 as a power source.

Assignees

• Lg Chemical Ltd

Inventors

• Park Jong Pil

Classifications

• H01M10/04 Primary

  Construction or manufacture in general (H01M10/058, H01M10/12, H01M10/28, H01M10/38 take precedence) · CPC title

• H01M50/179

  for cells having curved cross-section, e.g. round or elliptic (H01M50/176, H01M50/181 take precedence) · CPC title

• H01M50/548

  on opposite sides of the cell · CPC title

• H01M50/533

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

• H01M50/536

  characterised by the method of fixing the leads to the electrodes, e.g. by welding · CPC title