IP Library › Granted Patent US 12689039
Granted Patent B2
US 12689039 · App. 17/721,615 · Granted Jul 21, 2026

Electrical collector body of secondary battery and secondary battery

Inventors: Daisuke Horikawa (Kariya, JP); Yohei Shindo (Toyota, JP)
Assignee: PRIME PLANET ENERGY & SOLUTIONS, INC.
H01M4/667H01M4/661H01M4/72
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Quick Facts
Patent No.
US 12689039
App. No.
17/721,615
Granted
Jul 21, 2026
Kind
B2
Abstract

The electrical collector body of the secondary battery includes a resin layer, and metal foils that cover both surfaces of the resin layer. On the metal foils, multiple holes are formed.

Claims (19)

1 . An electrical collector body of a secondary battery, comprising:

a resin layer; and

metal foils that cover both surfaces of the resin layer, wherein

multiple holes penetrate all the way through each of the metal foils,

the metal foils comprise protrusions that are formed around at least some of the multiple holes and that protrude toward the resin layer,

the protrusions protrude into the resin layer, and

the resin layer enters into the multiple holes.

2 . The electrical collector body of the secondary battery according to claim 1 ,

wherein a part of the resin layer enters into the multiple holes that penetrate all the way through each of the metal foils toward a respective outer surface of each of the metal foils for a distance that is greater than a protruding height of the protrusions and blocks the multiple holes.

3 . The electrical collector body of the secondary battery according to claim 1 ,

wherein the protruding height of the protrusions is equal to or more than 0.01 μm and less than or equal to 3 μm.

4 . The electrical collector body of the secondary battery according to claim 1 ,

wherein diameters of each of the multiple holes are equal to or more than 0.001 μm and less than or equal to 100 μm.

5 . The electrical collector body of the secondary battery according to claim 1 ,

wherein an opening ratio of the multiple holes at a portion of the metal foils where the multiple holes are formed is equal to or more than 10% and less than or equal to 80%.

6 . The electrical collector body of the secondary battery according to claim 1 ,

wherein a melting point of the resin layer is equal to or less than 255° C.

7 . A secondary battery, comprising:

at least one among a positive electrode sheet in which a positive electrode active substance layer is formed on the electrical collector body according to claim 1 and a negative electrode sheet in which a negative electrode active substance layer is formed on the electrical collector body according to claim 1 .