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A method for evaluating the soh value of an electric vehicle battery pack

A technology for electric vehicles and battery packs, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as user inconvenience, delay in replacing electric vehicle battery packs, and inability to provide SOH values ​​of battery packs, so as to eliminate errors and achieve good results. The effect of electric vehicle experience

Active Publication Date: 2015-11-11
HUIZHOU EPOWER ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing methods for evaluating the SOH value of electric vehicle battery packs cannot provide SOH values ​​that reflect the actual performance changes of the battery pack during use when the electric vehicle is running.
This will delay the time to replace the EV battery pack and cause inconvenience to users

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0019] This embodiment provides a method for evaluating the SOH value of a lithium battery pack in an electric vehicle. The method is run in a battery pack management system on an electric vehicle. The battery pack management system is connected to the above-mentioned lithium battery pack to measure its various data. Then evaluate the SOH value.

[0020] The theoretical capacity of the above-mentioned lithium battery pack when it leaves the factory is Q ， The battery pack management system measures the actual capacity of the battery pack every 100 hours and evaluates the SOH value of the battery pack. The actual capacity measurement interval of each battery pack is determined according to the performance of the battery pack.

[0021] When the actual capacity of the battery pack was measured for the 20th time, the lithium battery pack was in a charging state. Before this charge, the SOC value of the lithium battery pack is M 20 ; After the lithium battery pack is fully charg...

Embodiment 2

[0028] This embodiment provides a method for evaluating the SOH value of a lithium battery pack in an electric vehicle. The method is run in a battery pack management system on an electric vehicle. The battery pack management system is connected to the above-mentioned lithium battery pack to measure its various data. Then evaluate the SOH value.

[0029] The theoretical capacity of the above-mentioned lithium battery pack when it leaves the factory is Q ， The battery pack management system measures the actual capacity of the battery pack every 125 hours and evaluates the SOH value of the battery pack.

[0030] When the actual capacity of the battery pack is measured for the 31st time, the discharge state of the lithium battery pack, before this discharge, the last measured SOH value is SOH 30 . The total discharge of the battery pack is measured at the time E 31 , the SOC value is M 31 . The actual capacity Q of the current battery pack can be calculated 31 =E 31 +SOH ...

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Abstract

The invention discloses an SOH (State Of Health) value evaluation method of an electric car battery pack. The SOH value evaluation method comprises the following steps: measuring an actual capacity of the battery pack and calculating an SOH value of the battery pack; and setting an SOH standard value of the battery pack and setting the difference of the SOH value of the battery pack and the SOH standard value of the battery pack to be m; when m is larger than 0, evaluating the SOH value of the electric car battery pack to be normal; and when m is smaller than or equal to 0, evaluating the SOH value of the electric car battery pack to be abnormal. The SOH value of the battery pack, which is obtained by the evaluation of the last time, is introduced for revising, so that an error generated by evaluating the SOH value of the battery pack at a charging state can be effectively eliminated. When the SOH value evaluation method of the electric car battery pack is used, an accurate immediate battery pack SOH value can be obtained when an electric car is operated and a user can further formulate a use scheme of the battery pack according to the obtained SOH value, so as to obtain good use experiences of the electric car.

Description

technical field [0001] The invention relates to the technical field of management of battery packs of electric vehicles, in particular to a method for evaluating the SOH value of battery packs of electric vehicles. Background technique [0002] As the battery is used, its performance will gradually decline. The specific performance is a decrease in battery capacity and shortened battery life. For electric vehicles, if the degradation of battery performance cannot be known, it will often cause inconvenience to actual driving due to insufficient power preparation. Therefore, it is necessary to evaluate the SOH (battery state of health) of the electric vehicle battery pack and replace the battery pack with a low SOH value. [0003] The commonly used method for evaluating the SOH value of electric vehicle battery packs is as follows: measure the actual capacity of the battery pack and divide it by the theoretical capacity of the battery pack when it leaves the factory, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/36
Inventor 刘飞文锋阮旭松田远波
Owner HUIZHOU EPOWER ELECTRONICS
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