Method of evaluating power storage device, method of manufacturing power storage device, and test system

Patent metadata

Field	Value
Publication number	US-12241941-B2
Application number	US-202418601023-A
Country	US
Kind code	B2
Filing date	Mar 11, 2024
Priority date	Nov 29, 2017
Publication date	Mar 4, 2025
Grant date	Mar 4, 2025

Abstract

A method of evaluating an all-solid-state battery includes preparing the all-solid-state battery. A charge level of the all-solid-state battery is adjusted to produce a first potential difference between a positive electrode and a negative electrode. The positive electrode or the negative electrode is selected as a reference electrode. After the charge level is adjusted, an operation to insert a conductive rod-shaped member into a stack portion along a direction of stack of the positive electrode and the negative electrode is performed while a second potential difference between the reference electrode and the rod-shaped member is measured. The rod-shaped member is stopped. The all-solid-state battery is evaluated based on a state of the all-solid-state battery after the rod-shaped member is stopped.

First claim

What is claimed is:

1. A method of evaluating an all-solid-state battery comprising at least:
preparing a power storage device, the power storage device including at least a housing and an electrode assembly, the electrode assembly being accommodated in the housing, the electrode assembly including a positive electrode and a negative electrode, at least one positive electrode and at least one negative electrode being alternately stacked to form a stack portion in the electrode assembly;
adjusting a charge level of the all-solid-state battery to produce a first potential difference between the positive electrode and the negative electrode;
selecting the positive electrode or the negative electrode as a reference electrode;
performing an operation to insert a conductive rod-shaped member into the stack portion along a direction of stack of the positive electrode and the negative electrode while a second potential difference between the reference electrode and the rod-shaped member is measured after the charge level is adjusted;
stopping the rod-shaped member; and
evaluating the all-solid-state battery based on a state of the all-solid-state battery after the rod-shaped member is stopped,
when an electrode with which the rod-shaped member comes in contact first in the stack portion is different from the reference electrode, the operation to insert the rod-shaped member being controlled to stop the rod-shaped member when a decrease in absolute value of the second potential difference is detected at least once, and
when the electrode with which the rod-shaped member comes in contact first in the stack portion is identical to the reference electrode, the operation to insert the rod-shaped member being controlled to stop the rod-shaped member when an increase in the absolute value of the second potential difference is detected at least once.

2. The method of evaluating the all-solid-state battery according to claim 1 , wherein
the rod-shaped member is inserted into the stack portion from outside of the housing.

3. The method of evaluating the all-solid-state battery according to claim 1 , wherein
the positive electrode is selected as the reference electrode.

4. The method of evaluating the all-solid-state battery according to claim 1 , wherein
the electrode with which the rod-shaped member comes in contact first in the stack portion is different from the reference electrode.

5. The method of evaluating the all-solid-state battery according to claim 4 , the method further comprising evaluating the all-solid-state battery by detecting increase in the absolute value of the second potential difference while the rod-shaped member remains stopped after the rod-shaped member is stopped.

6. The method of evaluating the all-solid-state battery according to claim 5 , the method further comprising evaluating the all-solid-state battery based on a time period elapsed since a time point of stop of the rod-shaped member until a time point of increase in the absolute value of the second potential difference.

7. The method of evaluating the all-solid-state battery according to claim 4 , wherein
the operation to insert the rod-shaped member is controlled to stop the rod-shaped member when decrease in the absolute value of the second potential difference is detected a plurality of times.

8. The method of evaluating the all-solid-state battery according to claim 1 , wherein
the electrode with which the rod-shaped member comes in contact first in the stack portion is identical to the reference electrode.

9. The method of evaluating the all-solid-state battery according to claim 8 , the method further comprising evaluating the all-solid-state battery by detecting decrease in the absolute value of the second potential difference while the rod-shaped member remains stopped after the rod-shaped member is stopped.

10. The method of evaluating the all-solid-state battery according to claim 9 , the method further comprising evaluating the all-solid-state battery based on a time period elapsed since a time point of stop of the rod-shaped member until a time point of decrease in the absolute value of the second potential difference.

11. The method of evaluating the all-solid-state battery according to claim 8 , wherein
the operation to insert the rod-shaped member is controlled to stop the rod-shaped member when increase in the absolute value of the second potential difference is detected a plurality of times.

12. A method of manufacturing an all-solid-state battery comprising at least:
manufacturing a plurality of the all-solid-state batteries; and
evaluating one or more of the plurality of the all-solid-state batteries by the method of the all-solid-state battery according to claim 1 .

13. A test system for evaluating an all-solid-state batteries, the all-solid-state battery including at least a housing and an electrode assembly, the electrode assembly being accommodated in the housing, the electrode assembly including a positive electrode and a negative electrode, at least one positive electrode and at least one negative electrode being alternately stacked to form a stack portion in the electrode assembly, the test system comprising at least:
a drive device;
a voltage measurement device; and
a control device,
the drive device being configured to perform an operation to insert a conductive rod-shaped member into the stack portion along a direction of stack of the positive electrode and the negative electrode,
the voltage measurement device being configured to measure a potential difference between a reference electrode and the rod-shaped member,
the positive electrode or the negative electrode being selected as the reference electrode,
the control device being configured to carry out at least one of first control and second control,
in the first control, when an electrode with which the rod-shaped member comes in contact first in the stack portion is different from the reference electrode, the operation to insert the rod-shaped member by the drive device being controlled to stop the rod-shaped member when a decrease in absolute value of the potential difference is detected at least once, and
in the second control, when the electrode with which the rod-shaped member comes in contact first in the stack portion is identical to the reference electrode, the operation to insert the rod-shaped member by the drive device being controlled to stop the rod-shaped member when an increase in the absolute value of the potential difference is detected at least once.

Assignees

• Toyota Motor Co Ltd

Inventors

• Miyazawa Kensaku
• Hamasaki Shinichi
• Ishihara Yuya
• Kaneko Tetsuya

Classifications

• H02J7/875

  Charging or discharging for charge maintenance, battery initiation or rejuvenation · CPC title

• G01R31/385

  Arrangements for measuring battery or accumulator variables (for monitoring G01R31/382) · CPC title

• G01R31/50

  Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections (testing of sparking plugs H01T13/58) · CPC title

• H01M10/4285

  Testing apparatus · CPC title

• H01M10/44

  Methods for charging or discharging (circuits for charging H02J7/00) · CPC title