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Method and device for determining capacity fading rate of power battery system

A capacity decay rate, power battery technology, applied in the direction of measuring devices, measuring electrical variables, measuring electricity, etc., can solve problems such as the deviation of the health status assessment of the power battery system from the actual situation, and achieve the effect of predicting abnormality

Pending Publication Date: 2022-06-28
BEIJING ELECTRIC VEHICLE
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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a method and device for determining the capacity decay rate of a power battery system, so as to solve the problem of deviation between the health status evaluation of the power battery system and the actual situation in the prior art

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  • Method and device for determining capacity fading rate of power battery system
  • Method and device for determining capacity fading rate of power battery system

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Embodiment Construction

[0076] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

[0077] The embodiments of the present invention provide a method and device for determining the capacity decay rate of a power battery system, aiming at the problem that the state of health assessment of the power battery system deviates from the actual situation in the prior art.

[0078] like figure 1 As shown, an embodiment of the present invention provides a method for determining a capacity decay rate of a power battery system, including:

[0079] Step 101: Obtain historical charging data of the target power battery system; wherein the historical charging data includes: multiple charging times and the highest single cell voltage, charging current, highest single cell temperature, and mileage corresponding to each charging time ;...

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Abstract

The invention provides a capacity fading rate determination method and device for a power battery system, and relates to the technical field of batteries, and the method comprises the steps: obtaining historical charging data of a target power battery system; dividing the historical charging data into at least one charging process according to the charging moment, the highest single cell voltage and the mileage; determining a first charging process according to the proportion of each piece of average charging information in all the average charging information and the driving mileage; determining a plurality of charging processes of which the average charging information is located in the same interval range as second charging processes; and determining the capacity fading rate of the target power battery system according to the first driving mileage and the first charging capacity corresponding to the first charging process and the plurality of second driving mileages and the plurality of second charging capacities corresponding to the second charging process. According to the scheme, the capacity attenuation condition is evaluated based on the use condition of the electric vehicle, so that whether the battery health state is abnormal is judged, and the battery risk is recognized in advance.

Description

technical field [0001] The invention belongs to the technical field of electronic equipment, and in particular relates to a method and device for determining the capacity decay rate of a power battery system. Background technique [0002] The safety problem of the power battery system of new energy vehicles is becoming more and more serious. Due to the complex chemical system of the battery, with the operation of the vehicle, the positive and negative electrode materials and separators of the battery continue to age, coupled with the effect of the external environment, and even extreme safety accidents occur, so the battery system The health status of the whole life cycle has always been concerned. [0003] Generally, SOH is used to indicate the state of health of the power battery. The SOH value is usually estimated by the battery management system based on the cumulative charge and discharge capacity of the battery. The table is usually formulated according to the cycle ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/392G01R31/388
CPCG01R31/392G01R31/388
Inventor 丁立姣耿兆杰盛军
Owner BEIJING ELECTRIC VEHICLE
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