Method for preventing battery overcharge and overdischarge and increasing battery efficiency

Patent metadata

Field	Value
Publication number	US-10527656-B2
Application number	US-201715794679-A
Country	US
Kind code	B2
Filing date	Oct 26, 2017
Priority date	Oct 31, 2016
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

A battery power table setting method for using battery power efficiently and preventing battery overcharge includes: a first table generation operation for generating a first table by measuring a maximum charging power that prevents an output of a battery from being more than a maximum allowable voltage when the battery having a predetermined SOC value is charged at a predetermined temperature for a predetermined time; a second table generation operation for generating a second table by measuring an SOC value at the time point that the battery reaches the maximum allowable voltage when the battery is charged with a predetermined power value at a predetermined temperature; a third table generation operation for generating a third table by calculating a second maximum charging power according to a predetermined temperature and a predetermined SOC value based on the second table; and a derating table generation operation for generating a derating table.

First claim

What is claimed is:

1. A battery power table setting method for using battery power efficiently and preventing battery overcharge, the method comprising:
a first table generation operation for generating a first table by measuring a maximum charging power that prevents an output of a battery from being more than a maximum allowable voltage when the battery having a predetermined SOC value is charged at a predetermined temperature for a predetermined time;
a second table generation operation for generating a second table by measuring an SOC value at the time point that the battery reaches the maximum allowable voltage when the battery is charged with a predetermined power value at a predetermined temperature;
a third table generation operation for generating a third table by calculating a second maximum charging power according to a predetermined temperature and a predetermined SOC value based on the second table;
a derating table generation operation for generating a derating table based on the first table and the third table; and
a final power table generation operation for generating a final power table based on the first table and the derating table.

2. The method of claim 1 , wherein the predetermined time in the first table generation operation is set to a short time within 10 seconds so that the temperature of the battery does not change while the battery is charged.

3. The method of claim 1 , wherein the derating table generation operation generates a derating table by dividing a second maximum charging power value corresponding to each temperature and SOC value of the third table by a first maximum charging power value corresponding to each temperature and SOC value of the first table.

4. The method of claim 1 , wherein the final power table generation operation further comprises:
a derating minimum value detection operation for detecting a minimum value among derating values according to a temperature at a predetermined SOC value in the derating table;
a fifth power table generation operation for multiplying the derating minimum value by the first power table to generate a fifth power table; and
a sixth table generation operation for generating a sixth table that limits the charging power values of the fifth power table to a maximum charging allowable power according to the temperature of the battery preset when the battery is manufactured,
wherein the final power table generation operation generates a final power table by additionally setting a maximum charging limit power value suitable for a product in the sixth table.

5. A battery power table setting method for using battery power efficiently and preventing battery overdischarge, the method comprising:
a first table generation operation for generating a first table by measuring a maximum charging power that prevents an output of a battery from being less than a minimum allowable voltage when the battery having a predetermined SOC value is discharged at a predetermined temperature for a predetermined time;
a second table generation operation for generating a second table by measuring an SOC value at the time point that the battery reaches the minimum allowable voltage when the battery is discharged with a predetermined power value at a predetermined temperature;
a third table generation operation for generating a third table by calculating a second maximum charging power according to a predetermined temperature and a predetermined SOC value based on the second table;
a derating table generation operation for generating a derating table based on the first table and the third table; and
a final power table generation operation for generating a final power table based on the first table and the derating table.

6. The method of claim 5 , wherein the predetermined time in the first table generation operation is set to a short time within 10 seconds so that the temperature of the battery does not change while the battery is discharged.

7. The method of claim 5 , wherein the derating table generation operation generates a derating table by dividing a second maximum discharging power value corresponding to each temperature and SOC value of the third table by a first maximum discharging power value corresponding to each temperature and SOC value of the first table.

8. The method of claim 5 , wherein the final power table generation operation further comprises:
a derating minimum value detection operation for detecting a minimum value among derating values according to a temperature at a predetermined SOC value in the derating table;
a fifth power table generation operation for multiplying the derating minimum value by the first power table to generate a fifth power table; and
a sixth table generation operation for generating a sixth table that limits the discharging power values of the fifth power table to a maximum discharging allowable power according to the temperature of the battery preset when the battery is manufactured,

wherein the final power table generation operation generates a final power table by additionally setting a product limit discharging power value suitable for a product in the sixth table.

9. A battery power management system comprising:
a battery power table generation device;
a battery management system (BMS) configured to control a battery; and
a battery state measurement unit configured to measure a temperature and a state of charge (SOC) of the battery,
wherein the battery power table generation device comprises:
a battery rechargeable power and dischargeable power measurement unit configured to measure a rechargeable power and a dischargeable power of the battery according to a predetermined temperature and a predetermined SOC;
a table generation unit configured to generate first to third tables, a derating table, and a final power table based on values measured by the battery rechargeable power and dischargeable power measurement unit; and
a memory configured to store the first to third tables, the derating table, and the final power table generated by the table generation unit,
wherein the BMS controls charging and discharging of the battery based on the final power table generated by the battery power table generation device.

10. The system of claim 9 , wherein the table generation unit comprises:
a first table generation unit 110 configured to generate a first table by measuring a first maximum charging or discharging power that prevents an output of a battery from being more than a maximum allowable voltage or less than a minimum allowable voltage when the battery having a predetermined SOC value is charged or discharged at a predetermined temperature for a predetermined time;
a second table generation unit configured to generate a second table by measuring an SOC value at the time point that an output of the battery reaches the maximum allowable voltage or the minimum allowable voltage when the battery is charged or discharged with a predetermined power value at a predetermined temperature;
a third table generation unit configured to generate a third table by calculating a second maximum charging or discharging power according to a predetermined temperature and a predetermined SOC value based on the second table;
a derating table generation unit configured to generate a derating table based on the first table and the third table; and
a final power table generation unit configured to generate a final power table based on the first table and the derating table.

11. The system of claim 10 , wherein the final power table generation unit comprises:
a derating minimum value detection unit configured to detect a minimum value among derating values according to a temperature a

Assignees

• Lg Chemical Ltd

Inventors

• Choi Hae In
• Kang Jung Soo
• Cho Young Bo
• Oh Gyong Jin
• Lee Jong Bum

Classifications

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/977

  of the battery · CPC title

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• H02J7/63

  against overdischarge · CPC title

• H02J7/61

  against overcharge · CPC title