Granted Patent B2

US 12,654,590 · App. 18/458,168 · Granted Jun 16, 2026

Inventors: Shan Huang (Ningde, CN); Shichao Li (Ningde, CN); Haili Li (Ningde, CN); Wei Zhao (Ningde, CN); Lan Xie (Ningde, CN)

Assignee: CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

B60L58/13B60L58/16G01R31/382G01R31/392H02J7/825H02J7/84H02J7/92H02J7/94H02J7/977B60L53/62B60L58/12G01R31/3648G01R31/367G01R31/396H01M2010/4271H01M2010/4278H02J7/82H02J7/933

Abstract

Claims (75)

1 . A method for charging a traction battery, applied to a battery management system BMS of the traction battery, wherein the method comprises:

in a charging process of the traction battery, obtaining a state parameter of the traction battery, wherein the state parameter comprises at least one of the following parameters: a state of charge SOC, a state of health SOH, and a temperature;

determining an SOC interval value and a discharging parameter corresponding to discharging of the traction battery based on the state parameter of the traction battery, wherein the discharging parameter comprises at least one of the following parameters: a discharging time, a discharging current, and a discharging waveform; and,

when the SOC of the traction battery changes by the SOC interval value, controlling the traction battery to discharge with the discharging parameter,

wherein the SOC interval value and the discharging parameter corresponding to discharging of the traction battery are determined based on the state parameter of the traction battery and a preset mapping relationship between the state parameter and the discharging parameter,

wherein the preset mapping relationship comprises a mapping table between an SOC range, the SOC interval value corresponding to the SOC range, and the discharging parameter corresponding to the SOC range, in the mapping table, the discharging current increases as the SOC interval value decreases, and the discharging time corresponding to the discharging current increases as the SOC interval value decreases.

2 . The method according to claim 1 , wherein the state parameter comprises the SOH, and the discharging parameter comprises the discharging time and/or the discharging current; and, wherein

determining the SOC interval value and the discharging parameter corresponding to discharging of the traction battery based on the state parameter of the traction battery comprises:

when the SOH of the traction battery is greater than or equal to a preset SOH threshold, determining that the SOC interval value is a first SOC interval value, and the discharging parameter is a first discharging parameter; and

when the SOH of the traction battery is less than the preset SOH threshold, determining that the SOC interval value is a second SOC interval value, and the discharging parameter is a second discharging parameter,

wherein the first SOC interval value is greater than the second SOC interval value, and/or the first discharging parameter is greater than the second discharging parameter.

3 . The method according to claim 1 , wherein the state parameter comprises the temperature, and the discharging parameter comprises the discharging time and/or the discharging current; and, wherein

determining the SOC interval value and the discharging parameter corresponding to discharging of the traction battery based on the state parameter of the traction battery comprises:

when the temperature of the traction battery is greater than or equal to a first preset temperature threshold, determining that the SOC interval value is a first SOC interval value, and the discharging parameter is a first discharging parameter;

when the temperature of the traction battery is less than the first preset temperature threshold and greater than or equal to a second preset temperature threshold, determining that the SOC interval value is a second SOC interval value, and the discharging parameter is a second discharging parameter; and

when the temperature of the traction battery is less than the second preset temperature threshold, determining that the SOC interval value is a third SOC interval value, and the discharging parameter is a third discharging parameter,

wherein the second SOC interval value is greater than the first SOC interval value and the third SOC interval value, and/or the second discharging parameter is greater than the first discharging parameter and the third discharging parameter.

4 . The method according to claim 1 , wherein the discharging current ranges from 1 A to 5 A, and the discharging time ranges from 1 s to 60 s.

5 . The method according to claim 1 , wherein the SOC interval value ranges from 3% to 95%.

6 . A battery management system BMS of a traction battery, comprising a processor and a memory, wherein the memory is configured to store a computer program, and the processor is configured to invoke the computer program to perform the method for charging the traction battery according to claim 1 .

7 . The method according to claim 1 , wherein the state parameter comprises the SOC, and the discharging parameter comprises the discharging time and/or the discharging current; and, wherein

determining the SOC interval value and the discharging parameter corresponding to discharging of the traction battery based on the state parameter of the traction battery comprises:

when the SOC of the traction battery is less than a preset SOC threshold, determining that the SOC interval value is a first SOC interval value, and the discharging parameter is a first discharging parameter; and

when the SOC of the traction battery is greater than or equal to the preset SOC threshold, determining that the SOC interval value is a second SOC interval value, and the discharging parameter is a second discharging parameter,

wherein the first SOC interval value is greater than the second SOC interval value, and/or the first discharging parameter is less than the second discharging parameter.

8 . The method according to claim 1 , wherein before the controlling the traction battery to discharge with the discharging parameter, the method further comprises:

sending charging demand information, wherein a current demand value carried in the charging demand information is zero, and the charging demand information is used to control the traction battery to stop being charged.

9 . The method according to claim 8 , wherein before the controlling the traction battery to discharge, the method further comprises:

obtaining a current of the traction battery; and

the controlling the traction battery to discharge with the discharging parameter comprises:

when the current of the traction battery is less than or equal to a preset current threshold, controlling the traction battery to discharge with the discharging parameter.

10 . The method according to claim 8 , wherein after the traction battery is controlled to perform pulse discharge, the method further comprises:

when the discharging time of the traction battery is greater than or equal to a first preset time threshold or a time elapsed after the charging demand information is sent is greater than or equal to a second preset time threshold, controlling the traction battery to stop discharging.

11 . A battery management system BMS of a traction battery, comprising:

a processor; and

a memory storing a computer program executable by the processor, wherein the computer program comprises:

an obtaining module configured to: in a charging process of the traction battery, obtain a state parameter of the traction battery, wherein the state parameter comprises at least one of the following parameters: a state of charge SOC, a state of health SOH, and a temperature;

a control module configured to determine an SOC interval value and a discharging parameter corresponding to discharging of the traction battery based on the state parameter of the traction battery, wherein the discharging parameter comprises at least one of the following parameters: a discharging time, a discharging current, and a discharging waveform;

wherein, each time the SOC of the traction battery changes by the SOC interval value, the control module is configured to control the traction battery to discharge with the discharging parameter,

wherein the SOC interval value and the discharging parameter corresponding to discharging of the traction battery are determined based on the state parameter of the traction battery and a preset mapping relationship between the state parameter and the discharging parameter,

wherein the preset mapping relationship comprises a mapping table between an SOC range, the SOC interval value corresponding to the SOC range, and the discharging parameter corresponding to the SOC range, in the mapping table, the discharging current increases as the SOC interval value decreases, and the discharging time corresponding to the discharging current increases as the SOC interval value decreases.

12 . The BMS according to claim 11 , wherein the state parameter comprises: the SOH, and the discharging parameter comprises the discharging time and/or the discharging current; and

the control module is configured to:

when the SOH of the traction battery is greater than or equal to a preset SOH threshold, determine that the SOC interval value is a first SOC interval value, and the discharging parameter is a first discharging parameter; and

when the SOH of the traction battery is less than the preset SOH threshold, determine that the SOC interval value is a second SOC interval value, and the discharging parameter is a second discharging parameter,

wherein the first SOC interval value is greater than the second SOC interval value, and/or the first discharging parameter is greater than the second discharging parameter.

13 . The BMS according to claim 11 , wherein the state parameter comprises the temperature, and the discharging parameter comprises the discharging time and/or the discharging current; and

the control module is configured to:

when the temperature of the traction battery is greater than or equal to a first preset temperature threshold, determine that the SOC interval value is a first SOC interval value, and the discharging parameter is a first discharging parameter;

when the temperature of the traction battery is less than the first preset temperature threshold and greater than or equal to a second preset temperature threshold, determine that the SOC interval value is a second SOC interval value, and the discharging parameter is a second discharging parameter; and

when the temperature of the traction battery is less than the second preset temperature threshold, determine that the SOC interval value is a third SOC interval value, and the discharging parameter is a third discharging parameter, wherein the second SOC interval value is greater than the first SOC interval value and the third SOC interval value, and/or the second discharging parameter is greater than the first discharging parameter and the third discharging parameter.

14 . The BMS according to claim 11 , wherein the discharging current ranges from 1 A to 5 A, and the discharging time ranges from 1 s to 60 s.

15 . The BMS according to claim 11 , wherein the state parameter comprises the SOC, and the discharging parameter comprises the discharging time and/or the discharging current; and

the control module is further configured to:

when the SOC of the traction battery is less than a preset SOC threshold, determine that the SOC interval value is a first SOC interval value, and the discharging parameter is a first discharging parameter; and

when the SOC of the traction battery is greater than or equal to the preset SOC threshold, determine that the SOC interval value is a second SOC interval value, and the discharging parameter is a second discharging parameter,

wherein the first SOC interval value is greater than the second SOC interval value, and/or the first discharging parameter is less than the second discharging parameter.

16 . The BMS according to claim 11 , wherein the BMS further comprises a sending module configured to send charging demand information, wherein a current demand value carried in the charging demand information is zero, and the charging demand information is used to control the traction battery to stop being charged.

17 . The BMS according to claim 16 , wherein the obtaining module is further configured to: obtain a current of the traction battery; and

the control module is configured to: when the current of the traction battery is less than or equal to a preset current threshold, control the traction battery to discharge with the discharging parameter.

18 . The BMS according to claim 16 , wherein the control module is further configured to: when the discharging time of the traction battery is greater than or equal to a first preset time threshold or a time elapsed after the charging demand information is sent is greater than or equal to a second preset time threshold, control the traction battery to stop discharging.

19 . A method for charging a traction battery, applied to a battery management system BMS of the traction battery, wherein the method comprises:

in a charging process of the traction battery, obtaining a state parameter of the traction battery, wherein the state parameter comprises at least one of the following parameters: a state of charge SOC, a state of health SOH, and a temperature;

determining an SOC interval value and a discharging parameter corresponding to discharging of the traction battery based on the state parameter of the traction battery, wherein the discharging parameter comprises at least one of the following parameters: a discharging time, a discharging current, and a discharging waveform; and

wherein when the SOC of the traction battery changes by the SOC interval value, controlling the traction battery to discharge with the discharging parameter,

wherein the SOC interval value and the discharging parameter corresponding to discharging of the traction battery are determined based on the state parameter of the traction battery and a preset mapping relationship between the state parameter and the discharging parameter,

wherein the preset mapping relationship comprises a mapping table between an SOH range, an SOC range, the SOC interval value corresponding to the SOC range, and the discharging parameter corresponding to the SOC range, the SOC range is corresponding to the SOH range, the SOC interval value is corresponding to the SOC range, and the discharging parameter is corresponding to the SOC range, in the mapping table, as the SOC interval value decreases within the SOH range, the discharging current increases, and the discharging time corresponding to the discharging current increases.

20 . A battery management system BMS of a traction battery, comprising:

a processor; and

a memory storing a computer program executable by the processor, wherein the computer program comprises:

an obtaining module configured to: in a charging process of the traction battery, obtain a state parameter of the traction battery, wherein the state parameter comprises at least one of the following parameters: a state of charge SOC, a state of health SOH, and a temperature;

a control module configured to determine an SOC interval value and a discharging parameter corresponding to discharging of the traction battery based on the state parameter of the traction battery, wherein the discharging parameter comprises at least one of the following parameters: a discharging time, a discharging current, and a discharging waveform;

wherein, each time the SOC of the traction battery changes by the SOC interval value, the control module is configured to control the traction battery to discharge with the discharging parameter,

wherein the SOC interval value and the discharging parameter corresponding to discharging of the traction battery are determined based on the state parameter of the traction battery and a preset mapping relationship between the state parameter and the discharging parameter,

wherein the preset mapping relationship comprises a mapping table between an SOH range, an SOC range, the SOC interval value corresponding to the SOC range, and the discharging parameter corresponding to the SOC range, the SOC range is corresponding to the SOH range, the SOC interval value is corresponding to the SOC range, and the discharging parameter is corresponding to the SOC range, in the mapping table, as the SOC interval value decreases within the SOH range, the discharging current increases, and the discharging time corresponding to the discharging current increases.

Assignments (2)

Continuity (2)

References Cited (224)