CN-122017640-A - Power battery quality assurance assessment method and electronic equipment

CN122017640ACN 122017640 ACN122017640 ACN 122017640ACN-122017640-A

Abstract

The invention discloses a power battery quality assurance assessment method and electronic equipment, wherein the power battery quality assurance assessment method comprises the steps of calculating an actual battery health state value of a battery according to current use habits of a user based on an attenuation model of the power battery, wherein the attenuation model is constructed based on actual working state parameters of the power battery, the actual working state parameters meet error limiting conditions, obtaining total accumulated discharge capacity of the power battery when the actual battery health state value reaches a promised battery health state value of quality assurance promise, obtaining total mileage based on the total accumulated discharge capacity, and obtaining a quality assurance assessment result of the power battery based on the total mileage. According to the method, the quality assurance condition of the power battery can be estimated in real time based on the actual use condition of the power battery after the power battery is in service or delivered to a customer, and the accuracy of the quality assurance estimation of the power battery is improved.

Inventors

GAO HUAN
QIN ZHIDONG
YAN KANGKANG
ZHANG YANCHAO
SUN HENAN
ZHAI SHUWEI
HUO GUANNAN
WANG HUAPING
LU SHENGNAN

Assignees

北京卡文新能源汽车有限公司

Dates

Publication Date: 20260512
Application Date: 20260108

Claims (10)

1. The power battery quality assurance assessment method is characterized by comprising the following steps of: Calculating an actual battery health state value of the battery according to the current use habit of a user based on an attenuation model of the power battery, wherein the attenuation model is constructed based on actual working state parameters of the power battery, and the actual working state parameters meet error limiting conditions; obtaining the total accumulated discharge capacity of the power battery when the actual battery state of health value reaches the promised battery state of health value of quality assurance promise; and obtaining a total mileage based on the total accumulated discharge capacity, and obtaining a quality assurance evaluation result of the power battery based on the total mileage.
2. The method according to claim 1, wherein the actual operating state parameters include a battery history parameter when the battery is subjected to a state of charge correction, a first battery full charge parameter at the beginning of a battery full charge after the state of charge correction, and a second battery full charge parameter at the end of the battery full charge; Wherein the battery history parameters comprise a battery history state of charge value, a battery history accumulated discharge capacity and a battery history accumulated charge capacity; the first battery full charge parameter comprises a starting moment accumulated discharge capacity; the second battery full charge parameter comprises an end time accumulated discharge capacity, an end time accumulated charge capacity and an end time state of charge value.
3. The power cell quality assurance assessment method of claim 2, wherein constructing the decay model based on actual operating state parameters of the power cell comprises: And calculating to obtain a battery state of health value when the battery is fully charged based on the battery historical state of charge value, the battery historical accumulated discharge capacity, the battery historical accumulated charge capacity, the end time accumulated discharge capacity, the end time accumulated charge capacity and the end time state of charge value, wherein the end time state of charge value is the fully charged value.
4. The method for evaluating the quality assurance of a power battery according to claim 3, When the starting time accumulated discharge capacity, the battery history accumulated discharge capacity and the ending time accumulated discharge capacity meet the error limiting condition, the battery health state value of the battery in full charge is valid; And when the starting time accumulated discharge capacity, the battery history accumulated discharge capacity and the ending time accumulated discharge capacity do not meet the error limiting condition, the battery health state value when the battery is fully charged is invalid.
5. The power cell quality assurance assessment method of claim 4, wherein the error limiting conditions include: disAh 1-disAh 0 is less than or equal to the capacity deviation threshold; disAh 2-disAh 1 is less than or equal to the capacity deviation difference value; wherein disAh is the start time integrated discharge capacity, disAh0 is the battery history integrated discharge capacity, and disAh is the end time integrated discharge capacity.
6. The method according to claim 5, wherein the capacity deviation threshold is 5·ce, ce being a rated capacity of the power battery.
7. The power cell quality assurance assessment method of any one of claims 3-6, wherein constructing the decay model based on actual operating state parameters of the power cell further comprises: And obtaining an attenuation initial model through an Arrhenius formula based on the battery use temperature, the accumulated charging capacity at the end time and the battery health state value when the battery is fully charged.
8. The power cell quality assurance assessment method of claim 7, wherein constructing the decay model based on actual operating state parameters of the power cell further comprises: obtaining a plurality of attenuation initial models corresponding to the battery health state values when the batteries are fully charged; constructing probability distribution based on Monte Carlo based on a plurality of attenuation initial models; And obtaining model parameters of the attenuation initial model based on the probability distribution to obtain the attenuation model.
9. An electronic device, comprising: A processor; a memory communicatively coupled to the processor; the memory stores a computer program executable by the processor, the processor implementing the power battery quality assurance assessment method of any one of claims 1-8 when the computer program is executed.
10. The electronic device of claim 9, wherein the electronic device comprises a vehicle or a cloud server.

Description

Power battery quality assurance assessment method and electronic equipment Technical Field The invention relates to the technical field of batteries, in particular to a quality assurance assessment method for a power battery and electronic equipment. Background In the related art, the quality assurance assessment of the power battery is limited to a laboratory stage, and the method is to utilize the cycle life and calendar life test of the power battery to assess the cycle number or the storable days of the power battery attenuated to a specific SOH (State of Health), and the test environment of the laboratory is greatly different from the actual power battery use condition, so that the quality assurance assessment becomes difficult after the power battery is actually in service, and the accuracy of the quality assurance assessment is lower. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a quality assurance assessment method for a power battery, which can assess the quality assurance condition of the power battery in real time based on the actual use condition of the power battery after the power battery is in service or delivered to a customer, and improve the accuracy of the quality assurance assessment for the power battery. A second object of the present invention is to propose an electronic device. In order to solve the problems, an embodiment of the first aspect of the invention provides a quality assurance assessment method for a power battery, which comprises the steps of calculating an actual battery health state value of the battery according to current use habits of a user based on an attenuation model of the power battery, wherein the attenuation model is constructed based on actual working state parameters of the power battery, the actual working state parameters meet error limiting conditions, obtaining a total accumulated discharge capacity of the power battery when the actual battery health state value reaches a promised battery health state value of a quality assurance promise, obtaining a total mileage based on the total accumulated discharge capacity, and obtaining a quality assurance assessment result of the power battery based on the total mileage. According to the power battery quality assurance assessment method, after the power battery is in service or delivered to a customer, the actual battery health state value of the battery according to the current use habit of the user is calculated through the attenuation model of the power battery, the total accumulated discharge capacity of the power battery when the actual battery health state value reaches the promised battery health state value of a quality assurance promise is obtained, and the total mileage is obtained through the total accumulated discharge capacity, so that the quality assurance condition of the power battery is assessed in real time, and the accuracy of the power battery quality assurance assessment is improved. In some embodiments, the actual operating state parameters include a battery history parameter when the battery is subjected to state of charge correction, a first battery full charge parameter when the battery is fully charged after the state of charge correction is started, and a second battery full charge parameter when the battery is fully charged, wherein the battery history parameter includes a battery history state of charge value, a battery history accumulated discharge capacity and a battery history accumulated charge capacity, the first battery full charge parameter includes a start time accumulated discharge capacity, and the second battery full charge parameter includes an end time accumulated discharge capacity, an end time accumulated charge capacity and an end time state of charge value. In some embodiments, constructing the decay model based on actual operating state parameters of the power battery includes calculating a battery state of health value at full battery charge based on the battery historical state of charge value, the battery historical accumulated discharge capacity, the battery historical accumulated charge capacity, the end time accumulated discharge capacity, the end time accumulated charge capacity, and the end time state of charge value, wherein the end time state of charge value is a full charge. In some embodiments, the battery state of health value is valid when the start time accumulated discharge capacity, the battery history accumulated discharge capacity, and the end time accumulated discharge capacity satisfy the error constraint condition, and is invalid when the start time accumulated discharge capacity, the battery history accumulated discharge capacity, and the end time accumulated discharge capacity do not satisfy the error constraint condition. In some embodiments, the error limiting conditions include: disAh 1-disAh 0 is le