Battery health state acquisition method and device and storage medium

Abstract

The embodiment of the invention relates to a battery health state obtaining method and device and a storage medium, wherein the method comprises the steps: judging whether a capacity variation calculation condition is met or not when a vehicle is powered on; when it is judged that the capacity variation calculation condition is met, calculating the capacity variation; judging whether a capacity calculation condition is met or not; when it is judged that the capacity calculation condition is met, calculating the capacity; and calculating the health state of the battery according to the capacity variation and the capacity. By means of the method and device and the storage medium, the corresponding relation between the cycle number of the whole life cycle of the battery and the SOH does not need to be measured, and test resources and time are saved; the actual capacity aging degree of the battery is reflected more truly, the estimation accuracy of the state of charge and the driving range is improved, and good driving experience is provided for a user.

Description

technical field [0001] The present invention relates to the technical field of batteries, in particular to a method and device for acquiring a battery health state, and a storage medium. Background technique [0002] For new energy vehicles, especially pure electric vehicles, lithium-ion power batteries are the main source of power. The SOH (State Of Health) of the battery is an important parameter of the power battery, which represents the aging degree of the battery, that is, the attenuation of capacity and the increase of internal resistance. SOH is related to the estimation of other important states of the battery, such as the estimation of SOC (State of charge, state of charge) and allowable power. SOC and allowable power directly affect the mileage and driving experience, so how to accurately estimate the SOH of the battery is An important topic for pure electric vehicles. [0003] The SOH estimation of the existing new energy vehicle lithium-ion power battery genera...

AI Technical Summary

Problems solved by technology

In fact, due to the different temperatures of the batteries on different vehicles, the different working conditions experienced, and the differences between batteries, even with the same number of cycles, the SOH of different batteries is actually different, so this method It cannot truly reflect the actual SOH of the battery, which leads to inaccurate estimation of SOC and driving range, which seriously affects the driving experience of users

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