Non-aqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-11588203-B2
Application number	US-202017095912-A
Country	US
Kind code	B2
Filing date	Nov 12, 2020
Priority date	Nov 27, 2019
Publication date	Feb 21, 2023
Grant date	Feb 21, 2023

Abstract

A non-aqueous electrolyte secondary battery including an electrode body having a positive electrode and a negative electrode, a non-aqueous electrolyte, and a battery case is provided. The battery case includes a case body having an opening and configured to house the electrode body and the non-aqueous electrolyte, and a lid configured to close the opening. The lid includes a plate-shaped lid body, a valve portion configured to open when the internal pressure of the battery case is higher than a valve opening pressure determined in advance, and a degassing portion configured to set to be an opening pressure higher than the valve opening pressure of the valve portion.

First claim

What is claimed is:

1. A reusable non-aqueous electrolyte secondary battery comprising:
an electrode body having a positive electrode and a negative electrode;
a non-aqueous electrolyte; and
a battery case,
wherein the battery case includes:
a case body having an opening and configured to house the electrode body and the non-aqueous electrolyte, and
a lid configured to close the opening, and

the lid includes:
a plate-shaped lid body,
a valve portion configured to open when an internal pressure of the battery case is higher than a valve opening pressure determined in advance,
a degassing portion configured to be set to an opening pressure higher than the valve opening pressure of the valve portion,
in a state of reuse of the reusable non-aqueous electrolyte secondary battery, a sealing cap configured to seal the degassing portion, and
a welding protrusion provided on a peripheral edge of the degassing portion and configured to fit with the sealing cap.

2. The reusable non-aqueous electrolyte secondary battery according to claim 1 , wherein the welding protrusion and the degassing portion are provided in a same member.

3. The reusable non-aqueous electrolyte secondary battery according to claim 1 , wherein the degassing portion is provided in the lid body.

4. The reusable non-aqueous electrolyte secondary battery according to claim 3 , wherein in the degassing portion, a surface of the lid body facing the case body is formed in an R-shape.

5. The reusable non-aqueous electrolyte secondary battery according to claim 1 , wherein the non-aqueous electrolyte is a non-aqueous electrolytic solution,
the lid further includes:
a liquid injection hole configured to inject the non-aqueous electrolytic solution into the case body, and
a liquid injection plug that closes the liquid injection hole, and

the degassing portion is provided in the liquid injection plug.

6. The reusable non-aqueous electrolyte secondary battery according to claim 5 , wherein the liquid injection plug has a step portion that protrudes toward the case body, and
the degassing portion is provided at a portion protruding toward the case body, of the step portion.

7. The reusable non-aqueous electrolyte secondary battery according to claim 5 , wherein the degassing portion is provided in each of the liquid injection plug and the lid body.

8. The reusable non-aqueous electrolyte secondary battery according to claim 1 , wherein the state of reuse is a state in which the reusable non-aqueous electrolyte secondary battery has been degassed at least once.

9. A reused non-aqueous electrolyte secondary battery comprising:
an electrode body having a positive electrode and a negative electrode;
a non-aqueous electrolyte; and
a battery case,
wherein the battery case includes:
a case body having an opening and configured to house the electrode body and the non-aqueous electrolyte, and
a lid configured to close the opening,

the lid includes:
a plate-shaped lid body,
a valve portion configured to open when an internal pressure of the battery case is higher than a valve opening pressure determined in advance,
a degassing portion configured to be set to an opening pressure higher than the valve opening pressure of the valve portion,
a sealing cap configured to seal the degassing portion, and
a welding protrusion provided on a peripheral edge of the degassing portion and configured to fit with the sealing cap, and

the reused non-aqueous electrolyte secondary battery has been degassed at least once.

Assignees

• Toyota Motor Co Ltd

Inventors

• Umemura Kohji

Classifications

• H01G11/80 Primary

  Gaskets; Sealings · CPC title

• H01M50/636

  Closing or sealing filling ports, e.g. using lids · CPC title

• H01M10/0525 Primary

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

• H01M2220/20

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

• H01G11/82

  Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations · CPC title