Battery terminal, method for manufacturing battery terminal, and battery

Patent metadata

Field	Value
Publication number	US-2016118641-A1
Application number	US-201514921344-A
Country	US
Kind code	A1
Filing date	Oct 23, 2015
Priority date	Oct 24, 2014
Publication date	Apr 28, 2016
Grant date	—

Abstract

A battery terminal includes a shaft portion and a flange portion. The battery terminal is made of a clad material in which at least a first metal layer and a second metal layer are bonded to each other. Each of the shaft portion and the flange portion includes the first metal layer on a first side in a shaft direction and the second metal layer on a second side in the shaft direction. The first metal layer in the shaft portion includes a protruding portion that further protrudes to the second side in the shaft direction with respect to a surface of the first metal layer on the second side in the shaft direction in the flange portion.

First claim

What is claimed is:

1 . A battery terminal comprising a shaft portion and a flange portion that radially expands in a radiation direction from the shaft portion,
the battery terminal made of a clad material in which at least a first metal layer and a second metal layer are bonded to each other, wherein each of the shaft portion and the flange portion includes the first metal layer on a first side in a shaft direction of the shaft portion and the second metal layer on a second side in the shaft direction of the shaft portion, and the first metal layer in the shaft portion includes a protruding portion that further protrudes to the second side in the shaft direction with respect to a surface of the first metal layer on the second side in the shaft direction in the flange portion.

2 . The battery terminal according to claim 1 , wherein
at least in a central portion of the shaft portion, the protruding portion of the first metal layer protrudes to the second side in the shaft direction with respect to the surface of the first metal layer on the second side in the shaft direction in the flange portion.

3 . The battery terminal according to claim 2 , wherein
in the central portion of the shaft portion, the protruding portion of the first metal layer includes a convex portion that protrudes in a convex shape to the second side in the shaft direction.

4 . The battery terminal according to claim 3 , wherein
in a shaft center of the shaft portion, the convex portion protrudes to the second side in the shaft direction with respect to a surface of the flange portion on the second side in the shaft direction.

5 . The battery terminal according to claim 4 , wherein
in the shaft center, the convex portion protrudes longer than a length of the flange portion in the shaft direction to the second side in the shaft direction beyond the surface of the flange portion on the second side in the shaft direction.

6 . The battery terminal according to claim 1 , wherein
one of the first metal layer and the second metal layer is made of Al or an Al alloy, and the other of the first metal layer and the second metal layer is made of Cu or a Cu alloy.

7 . The battery terminal according to claim 1 , wherein
in the shaft direction, a minimum length of the first metal layer of the flange portion is at least 30% of a length of the flange portion.

8 . The battery terminal according to claim 3 , wherein
in a shaft center of the shaft portion, a length from a surface of the flange portion on the second side in the shaft direction to an end of the convex portion on the second side in the shaft direction is not more than 80% of a length of the shaft portion.

9 . The battery terminal according to claim 1 , wherein
an end of the shaft portion on the second side in the shaft direction is formed with a bottomed hole in which a bottom surface and an inner side surface include the second metal layer.

10 . The battery terminal according to claim 1 , wherein
both the first metal layer and the second metal layer are substantially axisymmetric with respect to a shaft center of the shaft portion.

11 . The battery terminal according to claim 1 , further comprising a reaction suppression layer configured to suppress reaction of metal of which the first metal layer is made and metal of which the second metal layer is made.

12 . The battery terminal according to claim 2 , wherein
in the protruding portion of the first metal layer, an outside portion outside the central portion further protrudes to the second side in the shaft direction with respect to the central portion.

13 . The battery terminal according to claim 12 , wherein
the outside portion annularly protrudes to the second side in the shaft direction.

14 . The battery terminal according to claim 13 , wherein
the outside portion annularly protrudes so as to be tapered toward the second side in the shaft direction.

15 . A method for manufacturing a battery terminal, comprising:
forming an overlay clad material by bonding at least a first metal layer and a second metal layer to each other; and forming a battery terminal including a shaft portion and a flange portion that radially expands in a radiation direction from the shaft portion by performing extrusion processing on the overlay clad material, wherein
each of the shaft portion and the flange portion includes the first metal layer on a first side in a shaft direction of the shaft portion and the second metal layer on a second side in the shaft direction of the shaft portion, and
the first metal layer in the shaft portion includes a protruding portion that further protrudes to the second side in the shaft direction with respect to a surface of the first metal layer on the second side in the shaft direction in the flange portion.

16 . The method for manufacturing a battery terminal according to claim 15 , wherein
forming the overlay clad material includes bonding a reaction suppression layer configured to suppress reaction of metal of which the first metal layer is made and metal of which the second metal layer is made between the first metal layer and the second metal layer.

17 . A battery comprising a battery terminal including a shaft portion and a flange portion that radially expands in a radiation direction from the shaft portion, wherein
the battery terminal is made of a clad material in which at least a first metal layer and a second metal layer are bonded to each other, each of the shaft portion and the flange portion includes the first metal layer on a first side in a shaft direction of the shaft portion and the second metal layer on a second side in the shaft direction of the shaft portion, and the first metal layer in the shaft portion includes a protruding portion that further protrudes to the second side in the shaft direction with respect to a surface of the first metal layer on the second side in the shaft direction in the flange portion.

18 . The battery according to claim 17 , wherein
at least in a central portion of the shaft portion, the protruding portion of the first metal layer of the battery terminal protrudes to the second side in the shaft direction with respect to the surface of the first metal layer on the second side in the shaft direction in the flange portion.

19 . The battery according to claim 18 , wherein
in the central portion of the shaft portion, the protruding portion of the first metal layer of the battery terminal includes a convex portion that protrudes in a convex shape to the second side in the shaft direction.

20 . The battery according to claim 17 , wherein
the first metal layer of the battery terminal is connected to one of a connecting member and a collector made of the same type of metal as the first metal layer, and the second metal layer of the battery terminal is connected to the other of the connecting member and the collector made of the same type of metal as the second metal layer.

Assignees

• Neomax Materials Co Ltd
• Hitachi Metals Ltd
• Aoyama Seisakusho Ibaraki Plant Co Ltd

Inventors

• Oda Yoshimitsu
• Yamamoto Masaharu
• Ishio Masaaki
• Ishii Naonori
• Nakano Hirofumi

Classifications

• H01M50/55 Primary

  on the same side of the cell · CPC title

• H01M50/562 Primary

  characterised by the material · CPC title

• H01M50/553

  Terminals adapted for prismatic, pouch or rectangular cells · CPC title

• H01M2/30 Primary

  Electricity · mapped topic

• H01M10/0525

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