Method, apparatus and medium for estimating battery remaining life

1. A method for estimating a battery remaining life, comprising:

detecting a positive electrode potential, a negative electrode potential, and a state of charge (SOC) of a battery at a beginning of life (BOL) and after aging;

generating correlation curves between the negative electrode potential and the SOC of the battery at the BOL and after aging, and correlation curves between the positive electrode potential and the SOC of the battery at the BOL and after aging;

acquiring, based on the generated correlation curves, a material aging parameter of the battery representing an aging degree of a material of the battery;

determining, based on a preset corresponding relationship between the material aging parameter and the battery remaining life, the battery remaining life corresponding to the material aging parameter; and

outputting the determined battery remaining life for users to use;

wherein the material aging parameter comprises:

a first aging parameter representing an aging degree of electrode active material of the battery, and

a second aging parameter representing an aging degree of active ions of the battery;

wherein the first aging parameter comprises:

a positive electrode aging parameter representing an aging degree of positive electrode active material of the battery, and a negative electrode aging parameter representing an aging degree of negative electrode active material of the battery;

the acquiring the material aging parameter of the battery comprises:

acquiring a plurality of sets of first pending data within a preset time period, wherein each set of the first pending data comprises a battery open circuit voltage (OCV) under a quasi-stationary working condition, and a cumulative net charging and discharging capacity (Q) corresponding to the OCV;

determining a first current state of charge (SOC) corresponding to a current Q in each set of the first pending data by use of a first corresponding relationship function of the Q and a current SOC, and constructing a corresponding relationship between the OCV in each set of the first pending data and the first current SOC so as to obtain a plurality of corresponding sets of the OCV and the first current SOC, wherein a corresponding relationship coefficient of the Q and the current SOC in the first corresponding relationship function is a capacity aging parameter;

acquiring a plurality of sets of second pending data, wherein each set of the second pending data comprises a positive electrode potential of the battery at a beginning of life and operating under the quasi-stationary working condition, and an initial SOC corresponding to the positive electrode potential;

determining a second current SOC corresponding to the initial SOC in each set of the second pending data by use of a second corresponding relationship function of the initial SOC and the current SOC, and constructing a corresponding relationship between the positive electrode potential in each set of the second pending data and the second current SOC so as to obtain a plurality of corresponding sets of the positive electrode potential and the second current SOC, wherein a corresponding relationship coefficient of the initial SOC and the current SOC in the second corresponding relationship function is the positive electrode aging parameter;

acquiring a plurality of sets of third pending data, wherein each set of the third pending data comprises a negative electrode potential of the battery at the beginning of life and operating under the quasi-stationary working condition, and an initial SOC corresponding to the negative electrode potential;

determining a third current SOC corresponding to the initial SOC in each set of the third pending data by use of a third corresponding relationship function of the initial SOC and the current SOC, and constructing a corresponding relationship between the negative electrode potential in each set of the third pending data and the third current SOC so as to obtain a plurality of corresponding sets of the negative electrode potential and the third current SOC, wherein a corresponding relationship coefficient of the initial SOC and the current SOC in the third corresponding relationship function is the negative electrode aging parameter, and a constant term in the third corresponding relationship function is the second aging parameter;

processing the plurality of corresponding sets of the positive electrode potential and the second current SOC and the plurality of corresponding sets of the negative electrode potential and the third current SOC to obtain a plurality of corresponding sets of the OCV and a fourth current SOC; and

fitting the plurality of corresponding sets of the OCV and the first current SOC and the plurality of corresponding sets of the OCV and the fourth current SOC to obtain the capacity aging parameter, the second aging parameter, the positive electrode aging parameter, and the negative electrode aging parameter;

wherein the quasi-stationary working condition comprises a working condition in which a duration during which the battery is charged with a current less than a preset current threshold reaches a first preset duration.

2. The method for estimating a battery remaining life according to claim 1 , wherein

under a condition that the material aging parameter comprises the positive electrode aging parameter, the battery remaining life comprises a current remaining life of the positive electrode active material;

under a condition that the material aging parameter comprises the negative electrode aging parameter, the battery remaining life comprises a current remaining life of the negative electrode active material; and

under a condition that the material aging parameter comprises the second aging parameter, the battery remaining life comprises a current remaining life of the active ions.

3. The method for estimating a battery remaining life according to claim 2 , wherein

the material aging parameter comprises at least two aging parameters among the positive electrode aging parameter, the negative electrode aging parameter, and the second aging parameter;

the determining, based on the preset corresponding relationship between the material aging parameter and the battery remaining life, the battery remaining life corresponding to the material aging parameter comprises:

determining the battery remaining life as a minimum value of current remaining lives respectively corresponding to the at least two aging parameters.

4. The method for estimating a battery remaining life according to claim 1 , wherein

the material aging parameter comprises at least two aging parameters among the positive electrode aging parameter, the negative electrode aging parameter, and the second aging parameter;

the determining, based on the preset corresponding relationship between the material aging parameter and the battery remaining life, the battery remaining life corresponding to the material aging parameter comprises:

determining the battery remaining life as a minimum value of current remaining lives respectively corresponding to the at least two aging parameters.

5. A non-transitory computer storage medium storing computer program instructions thereon which implement, when executed by a processor, the method for estimating a battery remaining life according to claim 1 .

6. The method for estimating a battery remaining life according to claim 1 , wherein the preset corresponding relationship comprises: a first corresponding relationship between the material aging parameter and a material concentration change, and a second corresponding relationship between the material concentration change and the battery remaining life,

the determining, based on the preset corresponding relationship between the material aging parameter and the battery remaining life, the battery remaining life corresponding to the acquired material aging parameter comprises:

determining a current material concentration change corresponding to the material aging parameter based on the first corresponding relationship; and

determining the battery remaining life corresponding to the current material concentration change using the second corresponding relationship.

7. A device for estimating a battery remaining life, comprising:

an input apparatus;

an output apparatus;

a memory storing a program; and

a processor coupled to the input apparatus, the output apparatus and the memory and configured to operate the program stored in the memory to:

obtain, via the input apparatus, a positive electrode potential, a negative electrode potential, and a state of charge (SOC) of a battery detected at a beginning of life (BOL) and after aging;

generate correlation curves between the negative electrode potential and the SOC of the battery at the BOL and after aging, and correlation curves between the positive electrode potential and the SOC of the battery at the BOL and after aging;

acquire, based on the generated correlation curves, a material aging parameter of the battery representing an aging degree of a material of the battery;

determine, based on a preset corresponding relationship between the material aging parameter and the battery remaining life, the battery remaining life corresponding to the material aging parameter; and

output, via the output apparatus, the determined battery remaining life for users to use;

wherein the material aging parameter comprises:

a first aging parameter representing an aging degree of electrode active material of the battery, and

a second aging parameter representing an aging degree of active ions of the battery;

wherein the first aging parameter comprises:

a positive electrode aging parameter representing an aging degree of positive electrode active material of the battery, and a negative electrode aging parameter representing an aging degree of negative electrode active material of the battery;

the processor is configured to acquire the material aging parameter of the battery by:

acquiring a plurality of sets of first pending data within a preset time period, wherein each set of the first pending data comprises a battery open circuit voltage (OCV) under a quasi-stationary working condition, and a cumulative net charging and discharging capacity (Q) corresponding to the OCV;

determining a first current state of charge (SOC) corresponding to a current Q in each set of the first pending data by use of a first corresponding relationship function of the Q and a current SOC, and constructing a corresponding relationship between the OCV in each set of the first pending data and the first current SOC so as to obtain a plurality of corresponding sets of the OCV and the first current SOC, wherein a corresponding relationship coefficient of the Q and the current SOC in the first corresponding relationship function is a capacity aging parameter;

acquiring a plurality of sets of second pending data, wherein each set of the second pending data comprises a positive electrode potential of the battery at a beginning of life and operating under the quasi-stationary working condition, and an initial SOC corresponding to the positive electrode potential;

determining a second current SOC corresponding to the initial SOC in each set of the second pending data by use of a second corresponding relationship function of the initial SOC and the current SOC, and constructing a corresponding relationship between the positive electrode potential in each set of the second pending data and the second current SOC so as to obtain a plurality of corresponding sets of the positive electrode potential and the second current SOC, wherein a corresponding relationship coefficient of the initial SOC and the current SOC in the second corresponding relationship function is the positive electrode aging parameter;

acquiring a plurality of sets of third pending data, wherein each set of the third pending data comprises a negative electrode potential of the battery at the beginning of life and operating under the quasi-stationary working condition, and an initial SOC corresponding to the negative electrode potential;

determining a third current SOC corresponding to the initial SOC in each set of the third pending data by use of a third corresponding relationship function of the initial SOC and the current SOC, and constructing a corresponding relationship between the negative electrode potential in each set of the third pending data and the third current SOC so as to obtain a plurality of corresponding sets of the negative electrode potential and the third current SOC, wherein a corresponding relationship coefficient of the initial SOC and the current SOC in the third corresponding relationship function is the negative electrode aging parameter, and a constant term in the third corresponding relationship function is the second aging parameter;

processing the plurality of corresponding sets of the positive electrode potential and the second current SOC and the plurality of corresponding sets of the negative electrode potential and the third current SOC to obtain a plurality of corresponding sets of the OCV and a fourth current SOC; and

fitting the plurality of corresponding sets of the OCV and the first current SOC and the plurality of corresponding sets of the OCV and the fourth current SOC to obtain the capacity aging parameter, the second aging parameter, the positive electrode aging parameter, and the negative electrode aging parameter;

wherein the quasi-stationary working condition comprises a working condition in which a duration during which the battery is charged with a current less than a preset current threshold reaches a first preset duration.

8. The device for estimating a battery remaining life according to claim 7 , wherein

under a condition that the material aging parameter comprises the positive electrode aging parameter, the battery remaining life comprises a current remaining life of the positive electrode active material;

under a condition that the material aging parameter comprises the negative electrode aging parameter, the battery remaining life comprises a current remaining life of the negative electrode active material; and

under a condition that the material aging parameter comprises the second aging parameter, the battery remaining life comprises a current remaining life of the active ions.

9. The device for estimating a battery remaining life according to claim 8 , wherein

the material aging parameter comprises at least two aging parameters among the positive electrode aging parameter, the negative electrode aging parameter, and the second aging parameter;

the processor is configured to determine the battery remaining life by:

determining the battery remaining life as a minimum value of current remaining lives respectively corresponding to the at least two aging parameters.

10. The device for estimating a battery remaining life according to claim 7 , wherein

the material aging parameter comprises at least two aging parameters among the positive electrode aging parameter, the negative electrode aging parameter, and the second aging parameter;

the processor is configured to determine the battery remaining life by:

determining the battery remaining life as a minimum value of current remaining lives respectively corresponding to the at least two aging parameters.

11. The device for estimating a battery remaining life according to claim 7 , wherein the preset corresponding relationship comprises: a first corresponding relationship between the material aging parameter and a material concentration change, and a second corresponding relationship between the material concentration change and the battery remaining life,

the processor is configured to determine the battery remaining life by:

determining a current material concentration change corresponding to the material aging parameter based on the first corresponding relationship; and

determining the battery remaining life corresponding to the current material concentration change using the second corresponding relationship.