Method and apparatus for determining available energy of battery, management system, and storage medium
This disclosure provides a method and an apparatus for determining available energy of a battery, a battery management system, and a storage medium, and relates to the field of battery technologies. The method includes: obtaining a DOD interval corresponding to a current SOC interval of the battery, and a cycle quantity and a cycle temperature that correspond to the DOD interval; obtaining recoverable energy information of the battery based on the DOD interval, the cycle quantity, and the cycle temperature; and determining current remaining available energy of the battery based on the recoverable energy information. For a battery with a recoverable attenuation capacity, the method, the apparatus, the battery management system, and the storage medium in this disclosure could help improve accuracy in estimating remaining available energy of the battery, thereby improving battery reliability, prolonging a service life of the battery, and enhancing user experience.
1. A method for determining available energy of a battery, performed at an apparatus that includes one or more processors and memory, the method comprising:
establishing a connection between the apparatus and the battery through a communications interface of the apparatus;
obtaining, via the connection between the apparatus and the battery, a depth of discharge (DOD) interval corresponding to a current state of charge (SOC) interval of the battery;
obtaining, via the connection between the apparatus and the battery, a quantity of cycles and cycle temperature that correspond to the DOD interval;
obtaining, via the connection between the apparatus and the battery, recoverable energy information of the battery based on the DOD interval, the quantity of cycles, and the cycle temperature, wherein the recoverable energy information includes a recoverable energy attenuation amount, a recoverable energy attenuation variation, and a recoverable capacity attenuation amount, wherein the obtaining recoverable energy information of the battery based on the DOD interval, the quantity of cycles, and the cycle temperature includes:
pre-establishing, through a plurality of capacity test and energy test procedures, correspondence information between the recoverable energy information, and the DOD interval, the quantity of cycles, and the cycle temperature; and
obtaining, based on the correspondence information, the recoverable energy information corresponding to the DOD interval and the quantity of cycles; and
determining current remaining available energy of the battery based on the recoverable energy information.
2. The method according to claim 1 , wherein there are multiple DOD intervals corresponding to the SOC interval.
3. The method according to claim 1 , wherein the determining current remaining available energy of the battery based on the recoverable energy information comprises:
obtaining, based on battery state information, first battery remaining available energy corresponding to a state of the battery without a recoverable attenuation capacity; and
calculating the current remaining available energy of the battery based on the first battery remaining available energy and one of the recoverable energy attenuation amount and the recoverable energy attenuation variation.
4. The method according to claim 3 , wherein the obtaining, based on the correspondence information, the recoverable energy information corresponding to the DOD interval and the quantity of cycles comprises:
obtaining an interval-specific recoverable energy attenuation amount corresponding to the each DOD interval, based on the correspondence information, the DOD interval, the quantity of cycles, and the cycle temperature; and
obtaining a current recoverable energy attenuation amount of the battery based on the obtained interval-specific recoverable energy attenuation amount; and
wherein the calculating the current remaining available energy of the battery based on the first battery remaining available energy and the recoverable energy attenuation amount comprises:
subtracting the recoverable energy attenuation amount from the first battery remaining available energy, to obtain the current remaining available energy of the battery.
5. The method according to claim 3 , wherein the obtaining, based on the correspondence information, the recoverable energy information corresponding to the DOD interval and the quantity of cycles comprises:
obtaining an interval-specific recoverable energy attenuation variation corresponding to the DOD interval, based on the correspondence information, the DOD interval, the quantity of cycles, and the cycle temperature; and
obtaining a current recoverable energy attenuation variation of the battery based on the obtained interval-specific recoverable energy attenuation variation; and
wherein the calculating the current remaining available energy of the battery based on the battery remaining available energy and the recoverable energy attenuation amount comprises:
obtaining a current recoverable energy attenuation amount of the battery based on a previous recoverable energy attenuation amount of the battery and a current recoverable energy attenuation variation of the battery; and
subtracting the recoverable energy attenuation amount from the first battery remaining available energy, to obtain the current remaining available energy of the battery.
6. The method according to claim 1 , wherein the determining current remaining available energy of the battery based on the recoverable energy information comprises:
obtaining a first available capacity of the battery based on battery operating data; and
calculating the current remaining available energy of the battery based on the first available capacity and the recoverable capacity attenuation amount.
7. The method according to claim 6 , wherein the obtaining, based on the correspondence information, the recoverable energy information corresponding to the DOD interval and the quantity of cycles comprises:
obtaining an interval-specific recoverable capacity attenuation amount corresponding to the DOD interval, based on the correspondence information, the DOD interval, the quantity of cycles, and the cycle temperature; and
obtaining the recoverable capacity attenuation amount based on the obtained interval-specific recoverable capacity attenuation amount; and
wherein the calculating the current remaining available energy of the battery based on the first available capacity and the recoverable capacity attenuation amount comprises:
subtracting the recoverable capacity attenuation amount from the first available capacity, to obtain a current available capacity of the battery; and
obtaining the current remaining available energy of the battery based on the current available capacity of the battery and voltage information of the battery.
8. An apparatus for determining available energy of a battery, comprising:
a memory;
a processor; and
a plurality of instructions stored in the memory that, when executed by the processor, cause the apparatus to perform operations comprising:
establishing a connection between the apparatus and the battery through a communications interface of the apparatus;
obtaining, via the connection between the apparatus and the battery, a depth of discharge (DOD) interval corresponding to a current state of charge (SOC) interval of the battery;
obtaining, via the connection between the apparatus and the battery, a quantity of cycles and cycle temperature that correspond to the DOD interval;
obtaining, via the connection between the apparatus and the battery, recoverable energy information of the battery based on the DOD interval, the quantity of cycles, and the cycle temperature, wherein the recoverable energy information comprises a recoverable energy attenuation amount, a recoverable energy attenuation variation, and a recoverable capacity attenuation amount, wherein the obtaining recoverable energy information of the battery based on the DOD interval, the quantity of cycles, and the cycle temperature includes:
pre-establishing, through a plurality of capacity test and energy test procedures, correspondence information between the recoverable energy information, and the DOD interval, the quantity of cycles, and the cycle temperature; and
obtaining, based on the correspondence information, the recoverable energy information corresponding to the DOD interval and the quantity of cycles; and
determining current remaining available energy of the battery based on the recoverable energy information.
9. The apparatus according to claim 8 , wherein the apparatus is configured to:
obtain, based on battery state information, first battery remaining available energy corresponding to a state of the battery without a recoverable attenuation capacity; and
calculate the current remaining available energy of the battery based on the first battery remaining available energy and one of the recoverable energy attenuation amount and the recoverable energy attenuation variation.
10. The apparatus according to claim 9 , wherein the apparatus is configured to:
obtain an interval-specific recoverable energy attenuation amount corresponding to the DOD interval, based on the correspondence information, the DOD interval, the quantity of cycles, and the cycle temperature;
obtain a current recoverable energy attenuation amount of the battery based on the obtained interval-specific recoverable energy attenuation amount; and
subtract the recoverable energy attenuation amount from the first battery remaining available energy, to obtain the current remaining available energy of the battery.
11. The apparatus according to claim 9 , wherein the apparatus is configured to:
obtain an interval-specific recoverable energy attenuation variation corresponding to the DOD interval, based on the correspondence information as well as the DOD interval, the quantity of cycles, and the cycle temperature;
obtain a current recoverable energy attenuation variation of the battery based on the obtained interval-specific recoverable energy attenuation variation;
obtain a current recoverable energy attenuation amount of the battery based on a previous recoverable energy attenuation amount and a current recoverable energy attenuation variation of the battery; and
subtract the recoverable energy attenuation amount from the first battery remaining available energy, to obtain the current remaining available energy of the battery.
12. The apparatus according to claim 9 , wherein the apparatus is configured to:
obtain a first available capacity of the battery based on battery operating data; and
calculate the current remaining available energy of the battery based on the first available capacity and the recoverable capacity attenuation amount.
13. The apparatus according to claim 12 , wherein the apparatus is configured to:
obtain an interval-specific recoverable capacity attenuation amount corresponding to the DOD interval, based on the correspondence information as well as the DOD interval, the quantity of cycles, and the cycle temperature;
obtain the recoverable capacity attenuation amount based on the obtained interval-specific recoverable capacity attenuation amount;
subtract the recoverable capacity attenuation amount from the first available capacity, to obtain a current available capacity of the battery; and
obtain the current remaining available energy of the battery based on the current available capacity of the battery and voltage information of the battery.