STATE OF CHARGE DETECTING DEVICE, STATE OF CHARGE DETECTING METHOD, STATE OF CHARGE DETECTING SYSTEM, AND BATTERY PACK

• US 20160285281A1
• Filed: 03/21/2016
• Published: 09/29/2016
• Est. Priority Date: 03/26/2015
• Status: Abandoned Application

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: SHIMIZU, Takahiro
• Application Number:
  US15/075,863
• Publication Number:
  US 20160285281A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01R 31/3646 for indicating electrical conditions or variables, e.g. visual or audible indicators
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/3842 combining voltage and current measurements
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]

Abstract

A state of charge (SOC) detecting device includes a voltage monitor part connected to a battery and configured to monitor a voltage of the battery; a current monitor part connected to the battery and configured to monitor a current of the battery; an SOC calculation part configured to calculate an SOC of the battery by using any one or both of the voltage value monitored by a voltage monitor part and a current value monitored by the current monitor part; and an SOC conversion part configured to convert the SOC calculated by the SOC calculation part such to delay a change in SOC depending on a load of the battery.

Claims

1. A state of charge (SOC) detecting device, comprising:

a voltage monitor part connected to a battery and configured to monitor a voltage of the battery;

a current monitor part connected to the battery and configured to monitor a current of the battery;

an SOC calculation part configured to calculate an SOC of the battery by using any one or both of a voltage value monitored by the voltage monitor part and a current value monitored by the current monitor part; and

an SOC conversion part configured to convert the SOC calculated by the SOC calculation part to delay a change in SOC depending on a load of the battery.

2. The device of claim 1, further comprising an SOC notification part configured to externally notify about the SOC converted by the SOC conversion part.

3. The device of claim 2, wherein the SOC notification part is configured to notify an external residual capacity meter of the SOC.

4. The device of claim 1, wherein the SOC conversion part is configured to convert the SOC using a predetermined curve.

5. The device of claim 4, wherein the predetermined curve is a Bezier curve.

6. The device of claim 5, wherein the Bezier curve is a secondary Bezier curve generated based on three predetermined control points.

7. The device of claim 6, wherein the three control points comprise:

a point at which the SOC is a fully charged state;

a point at which the SOC is a completely discharged state; and

a middle point between the fully charged state and the completely discharged state in a load lower than the load of the SOC.

8. The device of claim 1, further comprising an average load calculation part configured to calculate an average value data based on a data obtained by previously measuring a predetermined load in the past,

wherein the SOC conversion part is configured to generate a predetermined curve using the average value data, and convert the SOC.

9. The device of claim 6, wherein the predetermined curve is a secondary Bezier curve generated based on a point at which the SOC is a fully charged state, a point at which the SOC is a completely discharged state, and a middle point between an SOC of an average load and the completely discharged state.

10. A battery pack, comprising:

a battery; and

a state of charge (SOC) detecting device,

wherein the SOC detecting device comprises;

a voltage monitor part connected to the battery and configured to monitor a voltage of the battery;

a current monitor part connected to the battery and configured to monitor a current of the battery;

an SOC calculation part configured to calculate an SOC of the battery by using any one or both of a voltage value monitored by the voltage monitor part and a current value monitored by the current monitor part; and

an SOC conversion part configured to convert the SOC calculated by the SOC calculation part to delay a change in SOC depending on a load of the battery.

11. The battery pack of claim 10, wherein the SOC detecting device further comprises an SOC notification part configured to externally notify about the SOC converted by the SOC conversion part.

12. The battery pack of claim 11, wherein the battery pack further comprises a residual capacity meter, and

the SOC notification part is configured to notify the residual capacity meter of the SOC.

13. The battery pack of claim 10, wherein the SOC conversion part is configured to convert the SOC using a predetermined curve.

14. The battery pack of claim 13, wherein the predetermined curve is a Bezier curve.

15. The battery pack of claim 14, wherein the Bezier curve is a secondary Bezier curve generated based on three predetermined control points.

16. The battery pack of claim 15, wherein the three predetermined control points comprise:

a point at which the SOC is a fully charged state;

a point at which the SOC is a completely discharged state; and

a middle point between the fully charged state and the completely discharged state in a load lower than the load of the SOC.

17. The battery pack of claim 10, wherein the SOC detecting device further comprises an average load calculation part configured to calculate average value data based on data obtained by previously measuring a predetermined load in the past, and

the SOC conversion part is configured to generate a predetermined curve using the average value data to convert the SOC.

18. The battery pack of claim 17, wherein the predetermined curve is a secondary Bezier curve generated based on a point at which the SOC is a fully charged state, a point at which the SOC is a completely discharged state, and a middle point between an SOC of an average load and the completely discharged state.

19. A state of charge (SOC) detecting system comprising a battery pack and a load-side system, wherein the battery pack comprises:

a battery; and

a state of charge (SOC) detecting device,

wherein the SOC detecting device comprises;

a voltage monitor part connected to the battery and configured to monitor a voltage of the battery;

a current monitor part connected to the battery and configured to monitor a current of the battery;

an SOC calculation part configured to calculate an SOC of the battery by using any one or both of a voltage value monitored by the voltage monitor part and a current value monitored by the current monitor part; and

an SOC conversion part configured to convert the SOC calculated by the SOC calculation part such to delay a change in SOC depending on a load of the battery.

20. The system of claim 19, wherein the load side system further comprises a residual capacity meter,

the SOC detecting device further comprises an SOC notification part configured to externally notify about the SOC converted by the SOC conversion part, and

the SOC notification part is configured to notify the residual capacity meter of the SOC.

21. The system of claim 20, wherein the SOC conversion part is configured to convert the SOC using a predetermined curve.

22. The system of claim 20, wherein the SOC detecting device further comprises an average load calculation part configured to calculate average value data based on data obtained by previously measuring a predetermined load in the past, and

the SOC conversion part is configured to generate a predetermined curve using the average value data to convert the SOC.

23. A state of charge (SOC) detecting method of a battery to be executed by an SOC detecting device comprising a voltage monitor part connected to the battery, a current monitor part connected to the battery, an SOC calculation part, and an SOC conversion part, the method comprising:

monitoring a voltage of the battery by the voltage monitor part;

monitoring a current of the battery by the current monitor part;

calculating, by the SOC calculation part, an SOC of the battery by using any one or both of a voltage value monitored by the voltage monitor part and a current value monitored by the current monitor part; and

converting, by the SOC conversion part, the SOC calculated by the SOC calculation part to delay a change in SOC depending on a load of the battery.

24. The method of claim 23, wherein the SOC conversion part is configured to convert the SOC using a predetermined curve.

25. The method of claim 23, wherein the SOC detecting device further comprises an average load calculation part configured to calculate average value data based on data obtained by previously measuring a predetermined load in the past, and

the SOC conversion part is configured to generate a predetermined curve using the average value data to convert the SOC.