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

Patent metadata

Field	Value
Publication number	US-2021091416-A1
Application number	US-202016897665-A
Country	US
Kind code	A1
Filing date	Jun 10, 2020
Priority date	Sep 19, 2019
Publication date	Mar 25, 2021
Grant date	—

Abstract

A secondary battery includes a positive electrode, a first aqueous electrolyte held on the positive electrode, a negative electrode, a second aqueous electrolyte held on the negative electrode, and a separator interposed between the positive electrode and the negative electrode. A difference between an osmotic pressure (N/m2) of the first aqueous electrolyte and an osmotic pressure (N/m2) of the second aqueous electrolyte is 90% or less (including 0%) of the higher one of the osmotic pressure of the first aqueous electrolyte and the osmotic pressure of the second aqueous electrolyte.

First claim

What is claimed is:

1 . A secondary battery comprising:
a positive electrode; a first aqueous electrolyte held on the positive electrode; a negative electrode; a second aqueous electrolyte held on the negative electrode; and a separator interposed between the positive electrode and the negative electrode, wherein a difference between an osmotic pressure (N/m 2 ) of the first aqueous electrolyte and an osmotic pressure (N/m 2 ) of the second aqueous electrolyte is 90% or less (including 0%) of the higher one of the osmotic pressure of the first aqueous electrolyte and the osmotic pressure of the second aqueous electrolyte.

2 . The secondary battery according to claim 1 , wherein the difference between the osmotic pressure of the first aqueous electrolyte and the osmotic pressure of the second aqueous electrolyte is 80% or less of the higher one of the osmotic pressure of the first aqueous electrolyte and the osmotic pressure of the second aqueous electrolyte.

3 . The secondary battery according to claim 1 , wherein the difference between the osmotic pressure of the first aqueous electrolyte and the osmotic pressure of the second aqueous electrolyte is 50% or less of the higher one of the osmotic pressure of the first aqueous electrolyte and the osmotic pressure of the second aqueous electrolyte.

4 . The secondary battery according to claim 1 , wherein at least one of the first aqueous electrolyte and the second aqueous electrolyte contains a compound capable of regulating an osmotic pressure.

5 . The secondary battery according to claim 4 , wherein the compound capable of regulating the osmotic pressure contains at least one of an inorganic compound, an organic compound, and a surfactant.

6 . The secondary battery according to claim 1 , wherein a gas permeability of the separator is 1×10 −14 m 2 or less.

7 . The secondary battery according to claim 1 , wherein an interfacial tension that is the higher one of an interfacial tension of the first aqueous electrolyte and an interfacial tension of the second aqueous electrolyte is 50 mN/m or less.

8 . The secondary battery according to claim 1 , wherein a negative electrode active material included in the negative electrode is at least one selected from the group consisting of titanium oxide, lithium titanium oxide, and lithium titanium composite oxide.

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

10 . The battery pack according to claim 9 , further comprising:
a conductive external terminal; and a protective circuit.

11 . The battery pack according to claim 9 , wherein the battery pack includes a plurality of the secondary batteries, and the secondary batteries are electrically connected in series, in parallel, or in a combination of a series connection and a parallel connection.

12 . A vehicle comprising the battery pack according to claim 9 .

13 . A stationary power supply comprising the battery pack according to claim 9 .

Assignees

• Toshiba Kk

Inventors

• Seki Hayato
• Uno Wataru
• Hotta Yasuyuki
• Matsuno Shinsuke

Classifications

• H01M10/36 Primary

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

• H01M4/48

  of inorganic oxides or hydroxides · CPC title

• H01G11/62

  characterised by the solute, e.g. salts, anions or cations therein · CPC title

• H01M2300/0002

  Aqueous electrolytes · CPC title

• H01M10/425

  Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00) · CPC title