A method and device for estimating the state of health of a vehicle power battery
A power battery and state-of-health technology, applied in measurement devices, measurement of electricity, measurement of electrical variables, etc., can solve problems such as differences, inconsistencies in life or capacity fading characteristics, and estimation model errors.
Active Publication Date: 2018-06-26
GAC AION NEW ENERGY AUTOMOBILE CO LTD
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- Application Information
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Problems solved by technology
Usually, the battery pack is a series-parallel connection of multiple cells, and its life or capacity attenuation characteristics are also related to the inconsistency between the cells. Therefore, errors are introduced into the established estimation model again, that is, there are differences from actual use
Method used
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Embodiment 1
[0072] please refer again image 3 As shown, based on the first embodiment of the present invention, the second embodiment of the present invention provides a device for estimating the state of health of a vehicle power battery, including:
[0073] The calculation unit 31 is used to calculate the equivalent capacity of the power battery according to the estimated capacity and temperature when the power battery is fully charged;
[0074] A first judging unit 32, configured to judge whether the calculated equivalent capacity is smaller than the stored equivalent capacity;
[0075] The second judging unit 33 is configured to judge whether the difference between the two is greater than a first threshold when the first judging unit 32 judges that the calculated equivalent capacity is smaller than the stored equivalent capacity;
[0076] The processing unit 34 is configured to subtract the first value from the current SOH value of the power battery when the second judging unit 33 j...
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The invention provides a method of estimating a vehicle-used power battery state of health (SOH) value and a device. The method comprises steps: S1, according to estimated capacity and temperature when the power battery completes charging, equivalent capacity of the power battery is calculated; S2, whether the calculated equivalent capacity is smaller than stored equivalent capacity is judged; S3, when the calculated equivalent capacity is smaller than the stored equivalent capacity, whether the difference value between the two is larger than a first threshold is judged; S4, when the difference value is larger than the first threshold, the first value is subtracted from the current SOH value of the power battery. Through calculating the equivalent capacity in the actual driving process, the equivalent capacity is compared with the stored equivalent capacity, whether the difference value exceeds the set first threshold is judged, the SOH value is processed according to a judgment result, and the SOH of the power battery can be estimated simply and relatively accurately.
Description
technical field [0001] The invention relates to the field of new energy vehicles, in particular to a method and device for estimating the health state value of a vehicle power battery. Background technique [0002] The State of Health (SOH) of the power battery is used to define the power storage capacity of the battery. The amount of electricity that a battery can store (i.e. capacity) and the ability to charge and discharge (i.e. power) will decay as the battery is used until it cannot meet the usage requirements. Usually, the batteries used in pure electric vehicles or pure electric-driven plug-in hybrid vehicles pay more attention to their battery capacity, so the attenuation of their battery capacity is usually used to examine or reflect the state of health. It is usually defined that when the battery capacity decays to 80% of its original value, it is considered to be at the end of its life. [0003] The existing SOH numerical estimation method is to establish a comp...
Claims
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IPC IPC(8): G01R31/36
Inventor 梅骜涂成娇曾勇罗杰肖莎闵文俊
Owner GAC AION NEW ENERGY AUTOMOBILE CO LTD