Apparatus and method for inspecting all-solid battery

• US 9,903,918 B2
• Filed: 04/19/2012
• Issued: 02/27/2018
• Est. Priority Date: 04/19/2012
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ose, Norihiro
• Primary Examiner(s): Berhanu, Samuel
• Application Number:
  US14/385,592
• Publication Number:
  US 20150048838A1
• Time in Patent Office: 2,140 Days
• Field of Search: 320132, 324434
• CPC Class Codes: G01R 31/3648 comprising digital calculation means, e.g. for performing an algorithm
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC
• CPC Class Codes: G01R 31/3842 combining voltage and current measurements
• CPC Class Codes: G01R 31/3865 related to manufacture, e.g. testing after manufacture
• CPC Class Codes: G01R 31/389 Measuring internal impedance, internal conductance or related variables
• CPC Class Codes: G01R 31/392 Determining battery ageing or deterioration, e.g. state of health

Abstract

An object of the present invention is to provide an apparatus for inspecting an all-solid battery with which a battery capacity where a voltage abnormality occurs can be grasped before the voltage abnormality occurs. The present invention is an apparatus for inspecting an all-solid battery including a storage section storing a relationship between the battery capacity where the voltage abnormality occurs and a resistance of the all-solid battery, and a resistance calculation section calculating the resistance based on a current and voltage in charging the all-solid battery, wherein the battery capacity where the voltage abnormality occurs in the all-solid battery is calculated from the relationship stored in the storage section and the resistance calculated in the resistance calculation section.

Claims

1. An apparatus for inspecting an all-solid battery, the all-solid battery including a solid electrolyte layer, the apparatus comprising:

a storage section storing a relationship between an all-solid battery capacity at which a voltage abnormality occurs in another all-solid battery having the same materials as the all-solid battery and a resistance of the other all-solid battery, wherein the voltage abnormality is a rapid lowering of the voltage of the all-solid battery that causes destruction to the all-solid battery; and

a resistance calculation section that, when a state of charge of the all-solid battery is in a range of 0% to 20%, calculates a resistance based on a measured current and measured voltage while charging the all-solid battery, wherein an all-solid battery capacity at which the voltage abnormality occurs in the all-solid battery is determined based on the relationship stored in the storage section and the resistance calculated by the resistance calculation section.

2. The apparatus for inspecting the all-solid battery according to claim 1, wherein the resistance calculation section calculates the resistance based on a current and voltage in charging at a constant current.

3. The apparatus for inspecting the all-solid battery according to claim 2, wherein a charging rate of the constant current is 10 C or less.

7. The apparatus for inspecting an all-solid battery according to claim 1, wherein, based on the determined all-solid battery capacity, a charging rate in rapid charging is reduced from an initial plan.

8. The apparatus for inspecting an all-solid battery according to claim 1, wherein, based on the determined all-solid battery capacity, the apparatus indicates that the all-solid battery should be replaced with another all-solid battery in which an occurrence of the voltage abnormality is not presumed.

4. An apparatus for inspecting an all-solid battery, the all-solid battery including a solid electrolyte layer, the apparatus comprising:

a processor programmed to;

store a relationship between an all-solid battery capacity at which a voltage abnormality occurs in another all-solid battery having the same materials as the all-solid battery and a resistance of the other all-solid battery, wherein the voltage abnormality is a rapid lowering of the voltage of the all-solid battery that causes destruction to the all-solid battery; and

when a state of charge of the all-solid battery is in a range of 0% to 20%;

calculate a resistance based on a measured current and a measured voltage while charging the all-solid battery; and

determine, based on the stored relationship and the calculated resistance, an all-solid battery capacity at which the voltage abnormality occurs in the all-solid battery.

5. The apparatus for inspecting the all-solid battery according to claim 4, wherein the processor is programmed to calculate the resistance based on a current and voltage in charging at a constant current.

6. The apparatus for inspecting the all-solid battery according to claim 5, wherein a charging rate of the constant current is 10 C or less.

9. The apparatus for inspecting an all-solid battery according to claim 4, wherein the processor is further programmed to:

based on the determined all-solid battery capacity, reduce a charging rate in rapid charging from an initial plan.

10. The apparatus for inspecting an all-solid battery according to claim 4, wherein the processor is further programmed to:

based on the determined all-solid battery capacity, indicate that the all-solid battery should be replaced with another all-solid battery in which an occurrence of the voltage abnormality is not presumed.