Secondary battery, battery pack, vehicle, and stationary power supply

Patent metadata

Field	Value
Publication number	US-2023335861-A1
Application number	US-202217822564-A
Country	US
Kind code	A1
Filing date	Aug 26, 2022
Priority date	Mar 9, 2022
Publication date	Oct 19, 2023
Grant date	—

Abstract

According to one embodiment, provided is a secondary battery including a negative electrode, a positive electrode, a first composite layer joined to the negative electrode, a second composite layer joined to the positive electrode, and an aqueous electrolyte. The first composite layer includes a first principal surface on a reverse side with respect to a surface joined to the negative electrode. The second composite layer includes a second principal surface on a reverse side with respect to a surface joined to the positive electrode and facing the first principal surface. Each of the first composite layer and the second composite layer contains inorganic solid particles and a polymeric material. A peel strength σ s between the first principal surface and second principal surface is 0.1 N/mm or less. The aqueous electrolyte includes water.

First claim

What is claimed is:

1 . A secondary battery comprising:
a negative electrode; a positive electrode; a first composite layer joined to the negative electrode, the first composite layer comprising a first principal surface on a reverse side with respect to a surface joined to the negative electrode, and containing inorganic solid particles and a polymeric material; a second composite layer joined to the positive electrode, the second composite layer comprising a second principal surface on a reverse side with respect to a surface joined to the positive electrode and facing the first principal surface, and containing inorganic solid particles and a polymeric material; and an aqueous electrolyte comprising water, a peel strength σ s between the first principal surface and the second principal surface being 0.1 N/mm or less.

2 . The secondary battery according to claim 1 , wherein the first composite layer has a thickness t n of 50 µm or less, and the second composite layer has a thickness t p of 50 µm or less.

3 . The secondary battery according to claim 1 , wherein the first composite layer and the second composite layer each have a porosity of 20% or less.

4 . The secondary battery according to claim 1 , wherein a peel strength σ n between the negative electrode and the first composite layer is greater than 0.3 N/mm, and a peel strength σ p between the positive electrode and the second composite layer is greater than 0.3 N/mm.

5 . The secondary battery according to claim 1 , wherein the negative electrode comprises a negative electrode active material, the negative electrode active material comprising a compound having a lithium ion insertion-extraction potential of 1 V to 3 V (vs. Li/Li + ) with respect to the oxidation-reduction potential of lithium.

6 . The secondary battery according to claim 1 , wherein the aqueous electrolyte has a pH of 9 or more.

7 . A battery pack comprising the secondary battery according to claim 1 .

8 . The battery pack according to claim 7 , further comprising:
an external power distribution terminal; and a protective circuit.

9 . The battery pack according to claim 7 , comprising plural of the secondary battery, the plural secondary batteries being electrically connected in series, in parallel, or in combination of in series and in parallel.

10 . A vehicle comprising the battery pack according to claim 7 .

11 . The vehicle according to claim 10 , which comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

12 . A stationary power supply comprising the battery pack according to claim 7 .

Assignees

• Toshiba Kk

Inventors

• Hotta Yasuyuki
• Hoshina Keigo
• Yoshima Kazuomi
• Matsuno Shinsuke

Classifications

• H01M50/446 Primary

  Composite material consisting of a mixture of organic and inorganic materials · CPC title

• H01M10/36

  Accumulators not provided for in groups H01M10/05-H01M10/34 · CPC title

• H01M50/204 Primary

  Racks, modules or packs for multiple batteries or multiple cells · CPC title

• H01M50/249

  specially adapted for aircraft or vehicles, e.g. cars or trains (constructional details of batteries specially adapted for electric vehicles B60L50/64) · CPC title

• H01M50/251

  specially adapted for stationary devices, e.g. power plant buffering or backup power supplies · CPC title