Three-dimensional electrode terminal for pouch-typed battery

• US 7,762,855 B2
• Filed: 03/11/2009
• Issued: 07/27/2010
• Est. Priority Date: 05/09/2005
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Ahn, Jaesung, Yoon, Junill, Yang, Heekook, Yu, Jisang
• Primary Examiner(s): Duverne; Jean F
• Application Number:
  US12/401,954
• Publication Number:
  US 20090176153A1
• Time in Patent Office: 503 Days
• Field of Search: 439/754, 439/755, 439/32, 439/765
• US Class Current: 439/754
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/058 Construction or manufacture
• CPC Class Codes: H01M 50/548 on opposite sides of the cell
• CPC Class Codes: H01M 50/553 Terminals adapted for prismatic, pouch or rectangular cells
• CPC Class Codes: H01M 50/566 by welding, soldering or brazing
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

Disclosed herein is a three-dimensional electrode terminal of a battery having an electrode assembly mounted in a pouch-shaped case, wherein a part of the electrode terminal, which is exposed from the battery case, has a predetermined thickness, and has a perpendicular surface (a perpendicular end surface) formed on the end thereof. According to the present invention, it is possible to easily accomplish the connection between the electrode terminal and the electrically connecting member without modifying the shape of the electrode terminal, and it is possible to easily accomplish the connection for detecting the voltage, the current, and the temperature of the battery. Furthermore, the mechanical strength of the three-dimensional electrode terminal according to the present invention is higher than that of the conventional plate-shaped electrode terminal. Consequently, the stability of the three-dimensional electrode terminal is high in the state that the electrode terminal is electrically connected with the electrically connecting member, and the electrical connection is easily accomplished even in a small space, especially when batteries are stacked one on another with high density so as to manufacture a medium- or large-sized battery module.

Claims

1. A three-dimensional electrode terminal of a battery constructed wholly in a plate shape and having an electrode assembly disposed in a pouch-shaped battery case and which comprises electrodes, the three-dimensional electrode terminal comprising:

an upper part exposed from the pouch-shaped battery case, the upper part having a predetermined thickness, and a perpendicular surface formed on an upper end thereof; and

a lower part disposed in the pouch-shaped battery case, the lower part directly connected to one of the electrodes of the electrode assembly and having a plate shape and a thin thickness relative to a thickness of the upper part;

wherein

the upper part is integrally formed with the lower part and is thicker than the lower part, and

the predetermined thickness is a thickness allowing the electrical connection of the electrode terminal without artificially modifying the shape of the electrode terminal and allowing the electrode terminal to be formed generally in a three-dimensional structure, not in a plate-shaped structure.

2. The electrode terminal according to claim 1, wherein the electrode terminal is formed of a material for the electrode terminal with the predetermined thickness.

3. The electrode terminal according to claim 2, wherein a basic three-dimensional structure of the electrode terminal is formed by die casting, and the lower part of the electrode terminal, which is to be brought into contact with the electrode assembly in the battery case, is formed in the plate shape by rolling.

4. The electrode terminal according to claim 1, wherein the electrode terminal is constructed such that the thickness of the upper part of the electrode terminal is increased toward the upper end thereof.

5. The electrode terminal according to claim 1, wherein at least one of the perpendicular end surface of the electrode terminal or an end side surface of the electrode terminal, which has a predetermined thickness, is provided with a through-hole or a depression.

6. The electrode terminal according to claim 5, wherein the through-hole or the depression has a thread part formed on the inner surface thereof.

7. The electrode terminal according to claim 1, wherein one of the perpendicular end surface and an end side surface of the electrode terminal is provided with a protrusion, which facilitates the electrical connection.

8. The electrode terminal according to claim 7, wherein the protrusion is provided at the outer surface thereof with a thread part or a groove.

9. The electrode terminal according to claim 1, wherein a portion of the perpendicular end surface of the electrode terminal extends from the side surface of the electrode terminal to form a side extension end.

10. The electrode terminal according to claim 1, wherein at least one of the perpendicular end surface and an end side surface of the electrode terminal is provided with depressions, which extend in at least one of the longitudinal direction of the electrode terminal and in the direction perpendicular to the longitudinal direction of the electrode terminal, respectively, and

the depressions facilitate the mechanical coupling of the electrode terminal with an electrically connecting member or an external device.

11. A pouch-shaped battery constructed wholly in a plate shape, the pouch-shaped battery comprising:

a pouch-shaped battery case;

an electrode assembly disposed in the pouch-shaped battery case and which comprises electrodes;

a three-dimensional electrode terminal comprising;

an upper part exposed from the pouch-shaped battery case, the upper part having a predetermined thickness and a perpendicular surface formed on an upper end thereof; and

a lower part disposed in the pouch-shaped battery case, the lower part directly connected to one of the electrodes of the electrode assembly and having a plate shape and a thin thickness relative to a thickness of the upper part;

wherein

the upper part is integrally formed with the lower part and is thicker than the lower part, and

the predetermined thickness is a thickness allowing the electrical connection of the electrode terminal without artificially modifying the shape of the electrode terminal and allowing the electrode terminal to be formed generally in a three-dimensional structure, not in a plate-shaped structure.

12. The pouch-shaped battery according to claim 11, wherein the electrode terminals comprise cathode terminal and an anode terminal, and

the electrode terminals are disposed at a same side of the pouch-shaped battery case or at different sides of the pouch-shaped battery case.

13. The pouch-shaped battery according to claim 12, wherein at least one of the cathode terminal and the anode terminal is the three-dimensional electrode terminal.

14. The pouch-shaped battery according to claim 11, wherein the electrode terminal is formed of a material for the electrode terminal with the predetermined thickness.

15. The pouch-shaped battery according to claim 14, wherein a basic three-dimensional structure of the electrode terminal is formed by die casting, and the lower part of the electrode terminal, which is to be brought into contact with the electrode assembly in the battery case, is formed in the plate shape by rolling.