Secondary battery, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-11631845-B2
Application number	US-202117186707-A
Country	US
Kind code	B2
Filing date	Feb 26, 2021
Priority date	Sep 17, 2020
Publication date	Apr 18, 2023
Grant date	Apr 18, 2023

Abstract

According to one embodiment, a secondary battery includes a positive electrode including first vacancies, a negative electrode including second vacancies, and an electrolyte. The electrolyte includes a gel polymer portion and a liquid portion, and the gel polymer portion has a gel-part ratio within a range of from 20% to 80%. At least a part of the electrolyte is held in the first vacancies and the second vacancies. A first ratio r1 of the liquid portion to the gel polymer portion in the first vacancies is within a range of 0.01≤r1≤10. A second ratio r2 of the liquid portion to the gel polymer portion in the second vacancies is within a range of 0.01≤r2≤10.

First claim

What is claimed is:

1. A secondary battery comprising:
a positive electrode comprising a positive electrode current collector and a positive electrode active material-containing layer provided on the positive electrode current collector, the positive electrode active material-containing layer having first vacancies;
a negative electrode comprising a negative electrode current collector and a negative electrode active material-containing layer provided on the negative electrode current collector, the negative electrode active material-containing layer having second vacancies; and
an electrolyte comprising a gel polymer portion and a liquid portion, the gel polymer portion having a gel-part ratio within a range of from 20% to 80%,
at least a part of the electrolyte being held in the first vacancies of the positive electrode active material-containing layer and the second vacancies of the negative electrode active material-containing layer,
a first ratio r1 of a proportion of the liquid portion to a proportion of the gel polymer portion of the electrolyte in the first vacancies of the positive electrode active material-containing layer being within a range of 0.01≤r1≤10,
a second ratio r2 of a proportion of the liquid portion to a proportion of the gel polymer portion of the electrolyte in the second vacancies of the negative electrode active material-containing layer being within a range of 0.01≤r2≤10, and
the first ratio r1 and the second ratio r2 satisfying a relationship of r1≤r2.

2. The secondary battery according to claim 1 , wherein in the positive electrode active material-containing layer, an amount of the liquid portion of the electrolyte on a side of a first interface between the positive electrode active material-containing layer and the positive electrode current collector is greater than an amount of the liquid portion on a side of a surface of the positive electrode active material-containing layer, and in the negative electrode active material-containing layer, an amount of the liquid portion of the electrolyte on a side of a second interface between the negative electrode active material-containing layer and the negative electrode current collector is greater than an amount of the liquid portion on a side of a surface of the negative electrode active material-containing layer.

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

4. The battery pack according to claim 3 , further comprising an external power distribution terminal and a protective circuit.

5. The battery pack according to claim 3 , comprising plural of the secondary battery, the secondary batteries being electrically connected in series, in parallel, or in combination of in-series connection and in-parallel connection.

6. A vehicle comprising the battery pack according to claim 3 .

7. The vehicle according to claim 6 , wherein the vehicle comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

Assignees

• Toshiba Kk

Inventors

• Yoshima Kazuomi
• Kusama Tomoe
• Sasakawa Tetsuya
• Harada Yasuhiro
• Takami Norio

Classifications

• H01M10/0565

  Polymeric materials, e.g. gel-type or solid-type · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/0525 Primary

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

• H01M4/366 Primary

  as layered products · CPC title