METHOD FOR CHARGING TRACTION BATTERY AND BATTERY MANAGEMENT SYSTEM
A method for charging a traction battery includes obtaining an actual charging current of a traction battery during a charging process of the traction battery, and determining, based on a degree of the actual charging current exceeding a requested charging current, whether to control the traction battery to be discharged.
1 . A method for charging a traction battery, comprising:
obtaining an actual charging current of a traction battery during a charging process of the traction battery; and
determining, based on a degree of the actual charging current exceeding a requested charging current, whether to control the traction battery to be discharged.
2 . The method according to claim 1 , wherein determining, based on the degree of the actual charging current exceeding the requested charging current, whether to control the traction battery to be discharged comprises:
in response to a ratio of a difference between the actual charging current and the requested charging current to the requested charging current being greater than a threshold, determining to control the traction battery to be discharged.
3 . The method according to claim 1 , wherein determining, based on the degree of the actual charging current exceeding the requested charging current, whether to control the traction battery to be discharged comprises:
in response to a ratio of a difference between the actual charging current and the requested charging current to the requested charging current being greater than a first threshold, determining an ampere-hour integral of the difference between the actual charging current and the requested charging current; and
in response to the ampere-hour integral is greater than a second threshold, determining to control the traction battery to be discharged.
4 . The method according to claim 1 , further comprising:
in response to determining to control the traction battery to be discharged, sending charging request information to a charging pile, the charging request information being used to request that a charging current be 0; and
in response to the actual charging current of the traction battery being less than or equal to a threshold, controlling the traction battery to be discharged.
5 . The method according to claim 4 , further comprising:
in response to a duration elapsed after the charging request information is sent being greater than or equal to a preset time interval, controlling the traction battery to stop being discharged.
6 . The method according to claim 5 ,
wherein the charging request information is first charging request information;
the method further comprising:
in response to the traction battery being controlled to stop being discharged, sending second charging request information to the charging pile based on a charging matching table, the second charging request information being used to request the charging pile to charge the traction battery.
7 . The method according to claim 1 , further comprising:
in response to a duration for controlling the traction battery to be discharged being greater than or equal to a preset time interval, controlling the traction battery to stop being discharged.
8 . The method according to claim 7 , further comprising:
in response to the traction battery being controlled to stop being discharged, sending charging request information to a charging pile based on a charging matching table, the charging request information being used to request the charging pile to charge the traction battery.
9 . A battery management system, comprising:
an obtaining module configured to obtain an actual charging current of a traction battery during a charging process of the traction battery; and
a determining module configured to determine, based on a degree of the actual charging current exceeding a requested charging current, whether to control the traction battery to be discharged.
10 . The battery management system according to claim 9 , wherein the determining module is further configured to:
in response to a ratio of a difference between the actual charging current and the requested charging current to the requested charging current being greater than a threshold, determine to control the traction battery to be discharged.
11 . The battery management system according to claim 9 , wherein the determining module is further configured to:
in response to a ratio of a difference between the actual charging current and the requested charging current to the requested charging current being greater than a first threshold, determine an ampere-hour integral of the difference between the actual charging current and the requested charging current; and
in response to the ampere-hour integral being greater than a second threshold, determine to control the traction battery to be discharged.
12 . The battery management system according to claim 9 , further comprising:
a communication module configured to: in response to determining to control the traction battery to be discharged, send charging request information to a charging pile, the charging request information being used to request that a charging current be 0; and
a control module configured to: in response to the actual charging current of the traction battery being less than or equal to a threshold, control the traction battery to be discharged.
13 . The battery management system according to claim 12 , wherein the control module is further configured to:
in response to a duration elapsed after the charging request information is sent being greater than or equal to a preset time interval, control the traction battery to stop being discharged.
14 . The battery management system according to claim 13 ,
wherein the charging request information is first charging request information;
the battery management system further comprising:
a communication module configured to: in response to the traction battery being controlled to stop being discharged, send second charging request information to the charging pile based on a charging matching table, the second charging request information being used to request the charging pile to charge the traction battery.
15 . The battery management system according to claim 9 , further comprising:
a control module configured to: in response to a duration for controlling the traction battery to be discharged being greater than or equal to a preset time interval, control the traction battery to stop being discharged.
16 . The battery management system according to claim 15 , further comprising:
a communication module configured to: in response to the traction battery being controlled to stop being discharged, send charging request information to a charging pile based on a charging matching table, the charging request information being used to request the charging pile to charge the traction battery.
17 . A battery management system, comprising:
a memory storing instructions; and
a processor configured to execute the instructions to:
obtain an actual charging current of a traction battery during a charging process of the traction battery; and
determine, based on a degree of the actual charging current exceeding a requested charging current, whether to control the traction battery to be discharged.