Protective tape for positive electrode lead including adhesive layer having heat resistant filler, and battery including the same

Patent metadata

Field	Value
Publication number	US-12206139-B2
Application number	US-201917283663-A
Country	US
Kind code	B2
Filing date	Oct 4, 2019
Priority date	Oct 23, 2018
Publication date	Jan 21, 2025
Grant date	Jan 21, 2025

Abstract

A battery includes a positive electrode, a negative electrode, a positive electrode lead which is connected to the positive electrode, and a protective tape which covers the positive electrode lead. The protective tape includes a base material layer and an adhesive layer that is arranged on the base material layer; and the adhesive layer contains an adhesive material and a filler which contains at least one compound that is selected from among phosphoric acid group-containing compounds, boric acid group-containing compounds and silicic acid group-containing compounds.

First claim

The invention claimed is:

1. A protective tape for a battery, comprising:
a substrate layer; and
an adhesive layer provided on the substrate layer, wherein
the adhesive layer has an adhesive and a filler, wherein the filler includes at least one of the group consisting of a phosphoric acid-metal salt, and a silicic acid group-containing compound,
the phosphoric acid-metal salt includes at least one of the group consisting of a phosphoric acid-potassium salt, a phosphoric acid-calcium salt, a phosphoric acid-magnesium salt, and aluminum phosphate, and
the silicic acid group-containing compound includes at least one of the group consisting of a silicic acid ester, and a condensed silicic acid salt.

2. The protective tape for a battery according to claim 1 , wherein a content ratio of the filler in the adhesive layer is within a range of 1 mass % to 50 mass %.

3. The protective tape for a battery according to claim 1 , wherein a content ratio of the filler in the adhesive layer is within a range of 1 mass % to 30 mass %.

4. The protective tape for a battery according to claim 1 , wherein a thickness of the adhesive layer is within a range of 5 μm to 20 μm.

5. The protective tape for a battery according to claim 1 , wherein
the filler further includes a boric acid group-containing compound, and
the boric acid group-containing compound includes at least one of the group consisting of a boric acid-metal salt, a boric acid ester, and a condensed boric acid salt.

6. The protective tape for a battery according to claim 1 , wherein
the filler further includes a boric acid group-containing compound, and
the boric acid group-containing compound includes at least one of the group consisting of a boric acid-lithium salt, a boric acid-sodium salt, a boric acid-potassium salt, a boric acid-calcium salt, a boric acid-magnesium salt, aluminum borate, and melamine borate.

7. The protective tape for a battery according to claim 1 , wherein
the silicic acid group-containing compound further includes a silicic acid-metal salt, and
the silicic acid-metal salt includes at least one of the group consisting of a silicic acid-lithium salt, a silicic acid-sodium salt, a silicic acid-potassium salt, a silicic acid-calcium salt, a silicic acid-magnesium salt, a silicic acid-barium salt, and a silicic acid-manganese salt.

8. The protective tape for a battery according to claim 1 , wherein the filler further includes at least one of a phosphoric acid-sodium salt, a phosphoric acid-lithium salt, ammonium polyphosphate, and melamine polyphosphate.

9. The protective tape for a battery according to claim 1 , wherein the filler includes the phosphoric acid-metal salt and the silicic acid group-containing compound.

10. The protective tape for a battery according to claim 1 , wherein
the adhesive layer includes at least one of the group consisting of an ammonium salt, dicyandiamide, and melamine as a foaming accelerator, and
the foaming accelerator is decomposed by heat to release a gas component.

11. A battery, comprising:
a positive electrode;
a negative electrode;
a positive electrode lead connected to the positive electrode; and
a protective tape covering the positive electrode lead, wherein
the protective tape has a substrate layer and an adhesive layer provided on the substrate layer,
the adhesive layer has an adhesive and a filler, wherein the filler includes at least one of the group consisting of a phosphoric acid-metal salt, and a silicic acid group-containing compound;
the phosphoric acid-metal salt includes at least one of the group consisting of a phosphoric acid-potassium salt, a phosphoric acid-calcium salt, a phosphoric acid-magnesium salt, and aluminum phosphate; and
the silicic acid group-containing compound includes at least one of the group consisting of a silicic acid ester, and a condensed silicic acid salt.

12. The battery according to claim 11 , wherein a content ratio of the filler in the adhesive layer is within a range of 1 mass % to 50 mass %.

13. The battery according to claim 11 , wherein a content ratio of the filler in the adhesive layer is within a range of 1 mass % to 30 mass %.

14. The battery according to claim 11 , wherein a thickness of the adhesive layer is within a range of 5 μm to 20 μm.

15. The battery according to claim 11 , wherein
the filler further includes a boric acid group-containing compound, and
the boric acid group-containing compound includes at least one of the group consisting of a boric acid-metal salt, a boric acid ester, and a condensed boric acid salt.

16. The battery according to claim 11 , wherein
the filler further includes a boric acid group-containing compound, and
the boric acid group-containing compound includes at least one of the group consisting of a boric acid-lithium salt, a boric acid-sodium salt, a boric acid-potassium salt, a boric acid-calcium salt, a boric acid-magnesium salt, aluminum borate, and melamine borate.

17. The battery according to claim 11 , wherein
the silicic acid group-containing compound further includes a silicic acid-metal salt, and
the silicic acid-metal salt includes at least one of the group consisting of a silicic acid-lithium salt, a silicic acid-sodium salt, a silicic acid-potassium salt, a silicic acid-calcium salt, a silicic acid-magnesium salt, a silicic acid-barium salt, and a silicic acid-manganese salt.

18. The battery according to claim 11 , wherein the filler further includes at least one of a phosphoric acid-sodium salt, a phosphoric acid-lithium salt, ammonium polyphosphate, and melamine polyphosphate.

19. The battery according to claim 11 , wherein the filler includes the phosphoric acid-metal salt and the silicic acid group-containing compound.

20. The battery according to claim 11 , wherein
the adhesive layer includes at least one of the group consisting of an ammonium salt, dicyandiamide, and melamine as a foaming accelerator, and
the foaming accelerator is decomposed by heat to release a gas component.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Shiozaki Tomoki
• Yoshii Kazuhiro
• Nishino Hajime

Classifications

• H01M50/534

  characterised by the material of the leads or tabs · CPC title

• H01M50/533

  characterised by the shape of the leads or tabs · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/0525

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