Battery management systems, battery management methods, battery packs, and electric vehicles

Abstract

We provide a battery management system that updates the multi-stage constant current charging map according to the operating status of the battery monitored during charging using the multi-stage constant current charging map. [Solution] In the battery management system 100, the battery pack 10 includes a memory unit 120 that stores a charging map recording the correspondence between the first to nth reference currents for multi-stage constant current charging and the first to nth reference voltage ranges, and a control unit 140 that commands a charging circuit 50 connected to the battery to perform constant current charging using the kth reference current corresponding to the kth reference voltage range to which the battery voltage belongs, commands constant voltage charging using the upper limit of the kth reference voltage range when the battery voltage reaches the upper limit of the kth reference voltage range during charging, and starts constant current charging using the k+1 reference current corresponding to the k+1 reference voltage range when the battery's SOC reaches the upper limit of the kth reference SOC range.

Claims

1. A memory unit for storing a program for executing a battery management method that uses a charging map in which the correspondence between the first to nth reference currents for multi-stage constant current charging and the first to nth reference voltage ranges is recorded, A processor coupled to the memory section, When the program is executed by the processor, if the battery voltage of the battery reaches the upper limit of the k-th reference voltage range during constant current charging using the k-th reference current, the processor commands the charging circuit to perform constant voltage charging using the upper limit of the k-th reference voltage range, and if the SOC of the battery reaches the upper limit of the k-th reference SOC range due to the constant voltage charging, the processor commands the charging circuit to perform constant current charging using the k+1 reference current corresponding to the k+1 reference voltage range. Battery controller.

2. The aforementioned processor, The battery controller according to claim 1, wherein, after starting constant current charging using the k+1 reference current corresponding to the k+1 reference voltage range, when the battery voltage of the battery reaches the upper limit of the k+1 reference voltage range, the controller commands the charging circuit to perform constant voltage charging using the upper limit of the k+1 reference voltage range.

3. The aforementioned processor, The battery controller according to claim 1, which updates the charging map based on a k-th measured voltage curve and a k-reference voltage curve that show the correspondence between the battery voltage and the battery SOC over the charging period of the constant current charging using the k-reference current.

4. The aforementioned processor, The battery controller according to claim 3, which updates the k reference current based on the ratio of the average SOC of the k measured voltage curve to the average SOC of the k reference voltage curve.

5. The aforementioned processor, The battery controller according to claim 3, which updates the k reference current based on the ratio of the average voltage of the k reference voltage curve to the average voltage of the k measurement voltage curve.

6. The aforementioned processor, The battery controller according to claim 3, which updates the k reference current based on a first ratio of the average SOC of the k measured voltage curve to the average SOC of the k reference voltage curve, and a second ratio of the average voltage of the k reference voltage curve to the average voltage of the k measured voltage curve.

7. The aforementioned processor, The k-reference current is updated based on the ratio of the SOC of interest to the k-reference SOC. The battery controller according to claim 3, wherein the SOC of interest is the SOC of the battery at the point when the battery voltage reaches the upper limit of the k reference voltage range.

8. The aforementioned processor, The battery controller according to claim 3, which updates each of the remaining reference currents, excluding the k reference current, based on the ratio of the updated k reference current to the k reference current.

9. A battery pack comprising the battery controller according to any one of claims 1 to 8.

10. An electric vehicle comprising the battery pack described in claim 9.

11. A battery management method that uses a charging map in which the correspondence between the first to nth reference currents and the first to nth reference voltage ranges for multi-stage constant current charging is recorded, During constant current charging using the k-th reference current, when the battery voltage of the battery reaches the upper limit of the k-th reference voltage range, the charging circuit is instructed to perform constant voltage charging using the upper limit of the k-th reference voltage range. The process includes the step of commanding the charging circuit to perform constant current charging using the k+1 reference current corresponding to the k+1 reference voltage range when the State of Charge (SOC) of the battery reaches the upper limit of the k-th reference SOC range due to the constant voltage charging, Battery management methods.

12. The battery management method according to claim 11, further comprising the step of commanding the charging circuit to perform constant voltage charging using the k+1 reference voltage when the battery voltage of the battery reaches the upper limit of the k+1 reference voltage range, after starting constant current charging using the k+1 reference current corresponding to the k+1 reference voltage range.

13. The battery management method according to claim 11, further comprising the step of updating the charging map by comparing a k-th measured voltage curve showing the correspondence between the battery voltage and the battery's SOC over the charging period of the constant current charging using the k-th reference current with the k-th reference voltage curve.

14. The step of updating the aforementioned charging map is: The battery management method according to claim 13, wherein the k reference current is updated based on the ratio of the average SOC of the k measured voltage curve to the average SOC of the k reference voltage curve.

15. When executed by the processor, the processor will A program for performing the battery management method described in any one of claims 11 to 14.

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