Solid state batteries

Patent metadata

Field	Value
Publication number	US-2019372175-A1
Application number	US-201716314912-A
Country	US
Kind code	A1
Filing date	Feb 23, 2017
Priority date	Feb 23, 2017
Publication date	Dec 5, 2019
Grant date	—

Abstract

A solid state battery (10) including a stack of cells (22), each cell comprising a positive electrode (12), a negative electrode (14) and a solid electrolyte (16) disposed between the positive electrode (12) and the negative electrode (14), wherein a current collector (18) is disposed between the negative electrode (14) of a first cell (20A) and the positive electrode (12) of a second cell (20B), the second cell (20B) being adjacent to the first cell (20A), the solid state battery (10) comprising an ionic conductor (26) having two configurations, a normal configuration wherein the ionic conductor (26) is not in contact with the current collector (18) and a short-circuit configuration wherein the ionic conductor (26) is in contact with the current collector (18), the negative electrode (14) of the first cell (20A) and the positive electrode (12) of the second cell (20B) and wherein the ionic conductor (26) has an ionic conductivity which smaller than an electronic conductivity of the current collector (18).

First claim

1 . A solid state battery ( 10 ) comprising a stack of cells ( 22 ), each cell comprising a positive electrode ( 12 ), a negative electrode ( 14 ) and a solid electrolyte ( 16 ) disposed between the positive electrode ( 12 ) and the negative electrode ( 14 ), wherein a current collector ( 18 ) is disposed between the negative electrode ( 14 ) of a first cell ( 20 A) and the positive electrode ( 12 ) of a second cell ( 20 B), the second cell ( 20 B) being adjacent to the first cell ( 20 A), the solid state battery ( 10 ) comprising an ionic conductor ( 26 ) having two configurations, a normal configuration wherein the ionic conductor ( 26 ) is not in contact with the current collector ( 18 ) and a short-circuit configuration wherein the ionic conductor ( 26 ) is in contact with the current collector ( 18 ), the negative electrode ( 14 ) of the first cell ( 20 A) and the positive electrode ( 12 ) of the second cell ( 20 B) and wherein the ionic conductor ( 26 ) has an ionic conductivity which smaller than an electronic conductivity of the current collector ( 18 ).

2 . The solid state battery ( 10 ) according to claim 1 , wherein the ionic conductivity of the ionic conductor ( 26 ) is equal to or greater than 10 −5 S/cm.

3 . The solid state battery ( 10 ) according to claim 1 , wherein the ionic conductor ( 26 ) is configured to go from the normal configuration to the short-circuit configuration at a temperature equal to or greater than 100° C.

4 . The solid state battery ( 10 ) according to claim 1 , wherein the ionic conductor is a polymer ionic conductor.

5 . The solid state battery ( 10 ) according to claim 1 , wherein the ionic conductor ( 26 ) is an inorganic ionic conductor.

6 . The solid state battery ( 10 ) according to claim 1 , wherein the ionic conductor ( 26 ) is mounted on a bimetallic actuator.

7 . The solid state battery ( 10 ) according to claim 6 , wherein the stack of cells ( 22 ) is surrounded by a metallic casing ( 24 ) and a metal forming the bimetallic actuator is the same metal as the metallic casing ( 24 ).

8 . The solid state battery ( 10 ) according to claim 1 , comprising n cells ( 20 A, 20 B) and a number of ionic conductors ( 26 ) equal to or greater than n/10.

Assignees

• Toyota Motor Europe

Inventors

• Ishihara Yuya
• Katoh Yuki

Classifications

• H01M10/0418

  with bipolar electrodes · CPC title

• H01M2200/10

  Temperature sensitive devices · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M10/0565

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

• H01M10/0525

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