Battery state calculation method and calculation device, and storage medium

Abstract

The invention provides a battery state calculation method, a computer storage medium and a battery state calculation device. The method comprises the following steps: acquiring a first inflection point voltage threshold value of a battery, a first inflection point electric quantity corresponding to the first inflection point voltage threshold value, a second inflection point voltage threshold value and a second inflection point electric quantity corresponding to the second inflection point voltage threshold value; recording a first charging curve of the battery in real time; obtaining a target inflection point and a target inflection point electric quantity; detecting the electric quantity of the battery until the charging is completed, and obtaining the charging electric quantity of the battery from the target inflection point to the charging completion; and obtaining the capacity of the battery according to the target inflection point electric quantity and the charging electric quantity. According to the battery state calculation method, the target inflection point and the corresponding inflection point electric quantity are obtained through the first charging curve and the charging voltage difference curve, the capacity of the battery is calculated, a specific SOC interval does not need to be selected, and the accuracy of capacity calculation of the battery is improved.

Description

technical field [0001] The present invention relates to the technical field of vehicles, in particular to a calculation method, a calculation device and a computer storage medium for calculating battery status. Background technique [0002] With the rapid development of battery technology, lithium-ion batteries are widely used in fields such as electric vehicles and energy storage power stations. [0003] The aging degree of the battery can be expressed by SOH (State of Health, the state of health of the battery). SOH can be defined by the remaining capacity, internal resistance, and cycle times. Among them, the most commonly used method is to define the aging degree by the remaining capacity of the battery. The remaining capacity of the battery is mainly calculated by fully charging or fully discharging the battery to calculate the total power in the charging or discharging phase, or charging and discharging in a certain SOC (State of Charge, battery state of charge) interv...

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Problems solved by technology

[0004] However, the battery will gradually age during the cycle of continuous charge and discharge, and its performance will gradually decline, such as the decrease of battery capacity, increase of internal resistance and power decrease. safe question

To charge or discharge in a specific SOC interval, the interval selection needs to be long enough, and the accuracy of SOC is required to be high, and inaccurate SOC estimation will easily cause large errors in the results

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