DETERIORATION DETERMINATION METHOD, MANUFACTURING METHOD OF ELECTRIC STORAGE DEVICE, DETERIORATION DETERMINATION DEVICE, AND STORAGE MEDIUM

• US 20150369876A1
• Filed: 11/01/2013
• Published: 12/24/2015
• Est. Priority Date: 02/06/2013
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: KOBAYASHI, Kenji
• Granted Patent: US 10,054,645 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01R 31/3835 involving only voltage measurements
• CPC Class Codes: G01R 31/392 Determining battery ageing or deterioration, e.g. state of health
• CPC Class Codes: G01R 31/396 Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
• CPC Class Codes: H01M 10/04 Construction or manufacture in general H01M10/058, H01M10/12, H01M10/28, H01M10/38 take precedence
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/058 Construction or manufacture
• CPC Class Codes: H01M 10/482 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y10T 29/49004 including measuring or testing of device or component part
• CPC Class Codes: Y10T 29/49005 Acoustic transducer

Abstract

An object of the present invention is to accurately perform deterioration determination of a lithium ion secondary battery. In order to attain the object, in a deterioration determination method of the present invention, first, measurement processing of charging a deterioration determination target which is a battery cell or a battery module connecting a plurality of battery cells with each other up to a predetermined voltage value, discharging, and measuring a charge voltage value (a charge voltage value after the start of the discharge) within a predetermined period of time from the start of the discharge is repeated a plurality of times. Then, a deterioration state of the deterioration determination target is determined in consideration of a change mode of the charge voltage value after the start of the discharge due to the repetition of the charge and discharge.

Claims

1. A deterioration determination method, comprising

a deterioration determination step of:

repeating a plurality of times measurement processing of charging a deterioration determination target which is a battery cell or a battery module connecting a plurality of battery cells with each other up to a predetermined voltage value, discharging the deterioration determination target, and measuring a charge voltage value within a predetermined period of time from the start of the discharge; and

thereafter,

determining a deterioration state of the deterioration determination target in consideration of a change mode of the charge voltage value due to the repetition of the charge and discharge.

2. The deterioration determination method according to claim 1,

wherein in the deterioration determination step, the charge voltage value after repeating the charge and discharge a predetermined number of times is predicted on the basis of the change mode of the charge voltage value due to the repetition of the charge and discharge, and the deterioration state of the deterioration determination target is determined on the basis of a comparison result between a prediction value and a first reference value which is maintained in advance.

3. The deterioration determination method according to claim 1, further comprising:

a standing time determination step of determining whether or not a period of time of standing in a state of not using the deterioration determination target exceeds a predetermined period of time, before the deterioration determination step,

wherein in the deterioration determination step, the determination of the deterioration state is performed with respect to only the deterioration determination target in which the standing time exceeds the predetermined period of time.

4. The deterioration determination method according to claim 1, further comprising:

a previous step deterioration determination step of

performing once the measurement processing of charging the deterioration determination target up to a predetermined voltage value, discharging the deterioration determination target, and measuring the charge voltage value within a predetermined period of time from the start of the discharge, and thereafter,

determining the deterioration state of the deterioration determination target on the basis of a comparison result between a measurement value and a second reference value which is maintained in advance, before the deterioration determination step,

wherein in the deterioration determination step, the determination of the deterioration state is performed with respect to only the deterioration determination target in which the deterioration state determined in the previous step deterioration determination step is not at an acceptable level set in advance.

5. The deterioration determination method according to claim 4, further comprising:

a standing time determination step of determining whether or not a period of time of standing in a state of not using the deterioration determination target exceeds a predetermined period of time, before the previous step deterioration determination step,

wherein in the previous step deterioration determination step, the determination of the deterioration state is performed with respect to only the deterioration determination target in which the standing time exceeds the predetermined period of time.

6. The deterioration determination method according to claim 1,

wherein the battery cell is a lithium ion secondary battery cell.

7. A manufacturing method of an electric storage device, comprising:

a determination step of performing deterioration determination with respect to a deterioration determination target which is a battery cell or a battery module connecting a plurality of battery cells with each other, by using the deterioration determination method according to claim 1; and

a manufacturing step of manufacturing an electric storage device by using only the deterioration determination target which is determined as being acceptable in the determination step.

8. The manufacturing method of an electric storage device according to claim 7,

wherein in the determination step, the deterioration determination target in which a deterioration state determined in the deterioration determination step is at an acceptable level set in advance is determined as being acceptable.

9. The manufacturing method of an electric storage device according to claim 8,

wherein a standing time determination step of determining whether or not a period of time of standing in a state of not using the deterioration determination target exceeds a predetermined period of time, before the deterioration determination step,

wherein in the deterioration determination step, the determination of the deterioration state is performed with respect to only the deterioration determination target in which the standing time exceeds the predetermined period of time, and

wherein the deterioration determination target in which it is determined, in the standing time determination step, that the standing time does not exceed the predetermined period of time is further determined as being acceptable.

10. The manufacturing method of an electric storage device according to claim 8,

further comprising a previous step deterioration determination step of

performing once the measurement processing of charging the deterioration determination target up to a predetermined voltage value, discharging the deterioration determination target, and measuring the charge voltage value within a predetermined period of time from the start of the discharge, and thereafter,

determining the deterioration state of the deterioration determination target on the basis of a comparison result between a measurement value and a second reference value which is maintained in advance, before the deterioration determination step,

wherein in the deterioration determination step, the determination of the deterioration state is performed with respect to only the deterioration determination target in which the deterioration state determined in the previous step deterioration determination step is not at an acceptable level set in advance, and

wherein the deterioration determination target in which the deterioration state determined in the previous step deterioration determination step is at an acceptable level set in advance is further determined as being acceptable.

11. The manufacturing method of an electric storage device according to claim 10,

further comprising a standing time determination step of determining whether or not a period of time of standing in a state of not using the deterioration determination target exceeds a predetermined period of time, before the previous step deterioration determination step,

wherein in the previous step deterioration determination step, the determination of the deterioration state is performed with respect to only the deterioration determination target in which the standing time exceeds the predetermined period of time, and

wherein the deterioration determination target in which it is determined, in the standing time determination step, that the standing time does not exceed the predetermined period of time is further determined as being acceptable.

12. A deterioration determination device, comprising:

a maintaining unit maintaining a deterioration determination target which is a battery cell or a battery module connecting a plurality of battery cells with each other; and

a determination unit repeating a plurality of times measurement processing of charging the deterioration determination target maintained in the maintaining unit up to a predetermined voltage value, discharging the deterioration determination target, and measuring a charge voltage value within a predetermined period of time from the start of the discharge, and thereafter, determining a deterioration state of the deterioration determination target in consideration of a change mode of the charge voltage value due to the repetition of the charge and discharge.

13. The deterioration determination device according to claim 12,

wherein the determination unit predicts the charge voltage value after repeating the charge and discharge a predetermined number of times on the basis of the change mode of the charge voltage value due to the repetition of the charge and discharge, and determines the deterioration state of the deterioration determination target on the basis of a comparison result between a prediction value and a first reference value which is maintained in advance.

14. The deterioration determination device according to claim 12, further comprising:

a previous step deterioration determination unit performing once the measurement processing of charging the deterioration determination target up to a predetermined voltage value, discharging the deterioration determination target, and measuring the charge voltage value within a predetermined period of time from the start of the discharge, and after that, determining the deterioration state of the deterioration determination target on the basis of a comparison result between a measurement value and a second reference value which is maintained in advance,

wherein the determination unit performs the determination of the deterioration state with respect to only the deterioration determination target in which the deterioration state determined by the previous step deterioration determination unit is not at an acceptable level set in advance.

15. The deterioration determination device according to claim 12,

wherein the battery cell is a lithium ion secondary battery cell.

16. A non-transitory storage medium storing a program for allowing a computer to function as:

a unit repeating a plurality of times measurement processing of charging a deterioration determination target which is a battery cell or a battery module connecting a plurality of battery cells with each other up to a predetermined voltage value, discharging the deterioration determination target, and measuring a charge voltage value within a predetermined period of time from the start of the discharge, and after that, determining a deterioration state of the deterioration determination target in consideration of a change mode of the charge voltage value due to the repetition of the charge and discharge.