Method of manufacturing electric power storage device, and electric power storage device

• US 10,014,512 B2
• Filed: 12/28/2015
• Issued: 07/03/2018
• Est. Priority Date: 03/03/2015
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Umeyama, Hiroya, Kozuki, Kiyomi
• Primary Examiner(s): Cantelmo, Gregg
• Application Number:
  US14/980,157
• Publication Number:
  US 20160260951A1
• Time in Patent Office: 918 Days
• CPC Class Codes: H01G 11/74 Terminals, e.g. extensions of current collectors
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 50/533 characterised by the shape of the leads or tabs
• CPC Class Codes: H01M 50/534 characterised by the material of the leads or tabs
• CPC Class Codes: H01M 50/55 on the same side of the cell
• CPC Class Codes: H01M 50/562 characterised by the material
• CPC Class Codes: H01M 50/566 by welding, soldering or brazing
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A method of manufacturing an electric power storage device includes a connection step of connecting an exposed portion, which is provided at one end in a direction of width of an electrode and constructed without a composite material layer being provided in a current collector, and a collector terminal provided on an outer side relative to the exposed portion in the direction of width of the electrode to each other. In the connection step, while a metal layer composed of a second metal higher in melting point than a first metal which forms the collector terminal lies between the exposed portion and the collector terminal, at least a portion of contact of the collector terminal with the metal layer is irradiated with energy.

Claims

1. A method of manufacturing an electric power storage device, comprising:

a connection step of connecting an exposed portion, which is provided at one end in a direction of width of an electrode and constructed without a composite material layer being provided in a current collector, and a collector terminal provided on an outer side relative to said exposed portion in the direction of width of said electrode to each other,

wherein, in said connection step, while a metal layer composed of a second metal higher in melting point than a first metal which forms said collector terminal lies between said exposed portion and said collector terminal, at least a portion of contact of said collector terminal with said metal layer being irradiated with energy,

said metal layer has a thickness not smaller than 0.5 μ

m and not greater 10 μ

m, and

said metal layer has a thickness not greater than a thickness of said current collector.

2. The method of manufacturing an electric power storage device according to claim 1, further comprising the steps of:

preparing an electrode having said exposed portion and said metal layer provided on a surface of said exposed portion extending in the direction of width of said electrode; and

bending said exposed portion provided with said metal layer such that at least a part of said metal layer is located on the outer side relative to said exposed portion in the direction of width of said electrode, before said connection step.

3. The method of manufacturing an electric power storage device according to claim 2, wherein

in prepared said electrode, an end surface of the metal layer located on a side of said composite material layer is distant from an end surface of a composite material layer located on a side of said metal layer.

4. The method of manufacturing an electric power storage device according to claim 1, wherein

said second metal is higher in melting point by at least 100°

C. than said first metal.

5. The method of manufacturing an electric power storage device according to claim 4, wherein

said first metal is copper, and

said second metal is at least one of nickel, titanium, chromium, and iron.

6. The method of manufacturing an electric power storage device according to claim 1, wherein

said metal layer has a thickness not smaller than 2 μ

m and not greater than 5 μ

m.

7. The method of manufacturing an electric power storage device according to claim 1, wherein

said metal layer has a width extending in the direction of width of the electrode of not smaller than 1 mm and not greater than 10 mm.

8. The method of manufacturing an electric power storage device according to claim 6, wherein

said metal layer has a width extending in the direction of width of the electrode of not smaller than 1 mm and not greater than 10 mm.

9. The method of manufacturing an electric power storage device according to claim 1, wherein

said metal layer has a width extending in the direction of width of the electrode of not smaller than 2 mm and not greater than 5 mm.

10. The method of manufacturing an electric power storage device according to claim 6, wherein

said metal layer has a width extending in the direction of width of the electrode of not smaller than 2 mm and not greater than 5 mm.

11. The method of manufacturing an electric power storage device according to claim 1, wherein

said metal layer has a width extending in the direction of width of the electrode of not smaller than 3 mm and not greater than 7 mm.

12. The method of manufacturing an electric power storage device according to claim 7, wherein

said first metal is copper, and

said second metal is at least one of nickel, titanium, chromium, and iron.

13. The method of manufacturing an electric power storage device according to claim 10, wherein

said first metal is copper, and

said second metal is at least one of nickel, titanium, chromium, and iron.

14. The method of manufacturing an electric power storage device according to claim 1, wherein

before said connection step, said metal layer is formed on a surface of said electrode current collector.

15. The method of manufacturing an electric power storage device according to claim 7, wherein

before said connection step, said metal layer is formed on a surface of said electrode current collector.

16. The method of manufacturing an electric power storage device according to claim 12, wherein

before said connection step, said metal layer is formed on a surface of said electrode current collector.

17. The method of manufacturing an electric power storage device according to claim 13, wherein

before said connection step, said metal layer is formed on a surface of said electrode current collector.

18. An electric power storage device, comprising:

an electrode having at one end in a direction of width, an exposed portion constructed without a composite material layer being provided in a current collector; and

a collector terminal provided on an outer side relative to said exposed portion in the direction of width of said electrode and connected to said exposed portion,

wherein a connection portion connecting said exposed portion and said collector terminal to each other including an alloy of a first metal forming said collector terminal and a second metal higher in melting point than said first metal,

said metal layer has a thickness not smaller than 0.5 μ

m and not greater than 10 μ

m, and

said metal layer has a thickness not greater than a thickness of the current collector.

19. The electric power storage device according to claim 18, wherein

said metal layer has a thickness not smaller than 2 μ

m and not greater than 5 μ

m.