CHARGING METHOD, BATTERY MANAGEMENT SYSTEM, BATTERY, AND CHARGING DEVICE
A charging method may include: sending a first command to a charging device, the first command being used to control the charging device to output an oscillation current to the battery during a first time period in a charging process, where the oscillation current may include n cycle periods, n being a positive integer greater than 1, each of the cycle periods may include a first sub-period and a second sub-period, a current output by the charging device during the first sub-period is a first current, a current output by the charging device during the second sub-period is a second current, and a direction of the first current may be opposite to that of the second current; and sending a second command to the charging device, the second command being used to instruct the charging device to charge the battery during a second time period in the charging process.
1 . A charging method, applied to a battery management module of a battery and comprising:
sending a first command to a charging device, the first command being used to control the charging device to output an oscillation current to the battery during a first time period in a charging process, wherein the oscillation current comprises n cycle periods, n being a positive integer greater than 1, each of the cycle periods comprises a first sub-period and a second sub-period, a current output by the charging device during the first sub-period is a first current, a current output by the charging device during the second sub-period is a second current, and a direction of the first current is opposite to that of the second current; and
sending a second command to the charging device, the second command being used to instruct the charging device to charge the battery during a second time period in the charging process.
2 . The charging method according to claim 1 , characterized in that the charging process comprises at least one first time period and at least one second time period.
3 . The charging method according to claim 1 , characterized in that the first current is a charging current of the battery, the second current is a discharging current of the battery, and a quantity of electricity charged with the first current during the first sub-period is less than or equal to a quantity of electricity discharged with the second current during the second sub-period.
4 . The charging method according to claim 3 , characterized in that a duration of the first sub-period is shorter than or equal to a duration of the second sub-period.
5 . The charging method according to claim 1 , characterized in that the method further comprises:
receiving a maximum output frequency of the charging device sent by the charging device; and
determining a duration of the cycle period based on the maximum output frequency.
6 . The charging method according to claim 1 , characterized in that the first sub-period and/or the second sub-period is 2 ms.
7 . The charging method according to claim 1 , characterized in that a number n of the cycle periods is 10000.
8 . The charging method according to claim 1 , characterized in that the method further comprises:
obtaining a state of charge SOC and a state of health SOH of the battery; and
determining a maximum magnitude of the first current and/or the second current based on the SOC and the SOH.
9 . The charging method according to claim 8 , characterized in that the first command comprises a maximum magnitude of the first current and/or the second current.
10 . The charging method according to claim 1 , characterized in that the sending a first command to a charging device comprises:
sending the first command to the charging device when the battery is connected to the charging device.
11 . The charging method according to claim 1 , characterized in that the sending a first command to a charging device comprises:
sending the first command to the charging device when it is determined that the battery meets at least one of the following conditions:
a temperature of the battery is less than or equal to a first threshold;
the battery is being charged in fast charging mode, the fast charging mode being a charging mode with a charging speed greater than or equal to a second threshold;
the battery has completed x cycles of charging and discharging, x being a positive integer;
the battery has lost y % of its capacity, y being a positive number; and
the battery has been in service for z days, z being a positive integer.
12 . A charging method, applied to a charging device and comprising:
receiving a first command sent by a battery management module of a battery;
outputting an oscillation current to the battery during a first time period in a charging process according to the first command, wherein the oscillation current comprises n cycle periods, n being a positive integer greater than 1, each of the cycle periods comprises a first sub-period and a second sub-period, a current output during the first sub-period is a first current, a current output during the second sub-period is a second current, and a direction of the first current is opposite to that of the second current;
receiving a second command sent by the battery management module; and
charging the battery during a second time period in the charging process according to the second command.
13 . The charging method according to claim 12 , characterized in that the charging process comprises at least one first time period and at least one second time period.
14 . The charging method according to claim 12 , characterized in that the first current is a charging current of the battery, the second current is a discharging current of the battery, and a quantity of electricity charged with the first current during the first sub-period is less than or equal to a quantity of electricity discharged with the second current during the second sub-period.
15 . The charging method according to claim 12 , characterized in that a duration of the first sub-period is shorter than or equal to a duration of the second sub-period.
16 . The charging method according to claim 12 , characterized in that the method further comprises:
sending a maximum output frequency of the charging device to the battery management module, the maximum output frequency being used to determine a duration of the cycle period.
17 . The charging method according to claim 16 , characterized in that the first sub-period and/or the second sub-period is 2 ms.
18 . The charging method according to claim 12 , characterized in that a number n of the cycle periods is 10000.
19 . The charging method according to claim 12 , characterized in that the first command comprises a maximum magnitude of the first current and/or the second current, the maximum magnitude of the first current and/or the second current being determined based on a state of charge SOC and a state of health SOH of the battery.
20 . The charging method according to claim 12 , characterized in that the receiving a first command sent by a battery management module of a battery comprises:
receiving the first command sent by the battery management module of the battery when the battery is connected to the charging device.