Secondary battery

Patent metadata

Field	Value
Publication number	US-2018159136-A1
Application number	US-201815886417-A
Country	US
Kind code	A1
Filing date	Feb 1, 2018
Priority date	Aug 31, 2015
Publication date	Jun 7, 2018
Grant date	—

Abstract

A secondary battery includes: a positive electrode having a positive-electrode current collector and a positive-electrode active-material layer; a negative electrode having a negative-electrode current collector and a negative-electrode active-material layer; a electrolyte; and an insulating tape covering a portion of the positive electrode. Furthermore, the positive-electrode current collector has an exposed section that the positive-electrode active-material layer is not disposed. In addition, at least a portion of the exposed section is covered with the insulating tape; the insulating tape has a substrate material layer and an adhesive layer; and the adhesive layer includes an adhesive agent and an insulating inorganic material.

First claim

1 . A. secondary battery comprising:
a positive electrode having a positive-electrode current collector and a positive-electrode active-material layer disposed on the positive-electrode current collector; a negative electrode having a negative-electrode current collector and a negative-electrode active-material layer disposed on the negative-electrode current collector; an electrolyte; and an insulating tape covering a portion of the positive electrode, wherein the positive-electrode current collector has an exposed section that the positive-electrode active-material layer is not disposed, at least a portion of the exposed section is covered with the insulating tape, the insulating tape has a substrate material layer and an adhesive layer, and the adhesive layer includes an adhesive agent and an insulating inorganic material.

2 . The secondary battery according to claim 1 , wherein the content of the insulating inorganic material included in the adhesive layer is 3 to 80 percent by mass.

3 . The secondary battery according to claim 1 , wherein the insulating inorganic material includes a metal compound in the form of particles or fibers.

4 . The secondary battery according to claim 1 , wherein the substrate material layer contains at least one of a polyimide, a polyamide, or a poly(amide imide), and wherein the polyimide contains at least one of a wholly aromatic polyimide, a semi-aromatic polyimide, a thermosetting polyimide, a polypyromellitimide, a poly(ether imide), or a thermosetting polyimide formed by a reaction between a bismaleimide and an aromatic diamine.

5 . The secondary battery according to claim 1 , wherein the thickness of the insulating tape is 45 μm or less.

6 . The secondary battery according to claim 1 , wherein the adhesive layer has an electric resistance of 1 kΩ/mm 2 or more at 500°C.

7 . The secondary battery according to claim 1 , wherein a thickness T ad of the adhesive layer is 5 to 25 μm.

8 . The secondary battery according to claim 1 , wherein a thickness of T ab of the substrate material layer is 10 to 30 μm.

9 . The secondary battery according to claim 1 , wherein a ratio T ad /T ab of a thickness T ad of the adhesive layer to a thickness T sb of the substrate material layer is 0.2 to 1.

10 . The secondary battery according to claim 1 , wherein insulating tape has a layer containing an insulating filler between the substrate material layer and the adhesive laver.

11 . The secondary battery according to claim 3 , wherein a shape of the metal compound in the form of particle is a spherical shape, a flake shape, or a whisker shape.

12 . The secondary battery according to claim 1 , wherein the insulating inorganic material is formed by a metal compound that accounts for 90 percent by mass or more of the insulating inorganic material and a material other than the metal compound.

13 . The secondary battery according to claim 1 , wherein insulating inorganic material contains at least one of a metal oxide, a metal nitride, or a metal carbide.

14 . The secondary battery according to claim 1 , wherein the insualting inorganic material contains a metal compound having an average particle diameter of 50 nm or more and 2 μm or less.

15 . The secondary battery according to claim 1 , wherein the substrate material layer is formed from a polymer alloy between a polyimide and a resin other than the polyimide.

16 . The secondary battery according to claim 1 , wherein the substrate material layer has a multilayer structure including a polyimide layer and a second resin layer containing a resin other than the polyimide.

17 . The secondary battery according to claim 1 , wherein the substrate material layer contains a polyimide, and the content of the polyimide to be contained in the substrate material layer is 80 percent by mass or more.

18 . The secondary battery according to claim 1 , wherein the adhesive layer includes at least one of an acrylic resin, a natural rubber, a synthetic rubber, a silicone, an epoxy resin, a melamine resin, or a phenol resin.

19 . The secondary battery according to claim 1 , wherein the adhesive layer includes at least one of a tackifier, a cross-linking agent, an anti-aging agent, a coloring agent, an antioxidant, a chain transfer agent, a plasticizer, a softening agent, a surfactant, or an antistatic agent.

20 . The secondary battery according to claim 1 , wherein
a positive-electrode lead is electrically connected to the exposed section, the positive-electrode lead has an extended section projected from the exposed section and an overlapping section overlapping the exposed section, and the insulating tape covers at least a portion of the overlapping section.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Shiozaki Tomoki
• Oura Yuji
• Nishino Hajime

Classifications

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/0525

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

• H01M10/052

  Li-accumulators · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M4/661 Primary

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title