Estimation method for polarization voltage of battery

A polarization voltage and battery technology, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of inability to accurately estimate SOC, inability to accurately estimate polarization voltage, etc., and achieve the effect of small error

Pending Publication Date: 2021-11-26
巨伍汽车科技(昆山)有限公司
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Problems solved by technology

Without accurate estimation of polarization voltage, accurate estimation of SOC is impossible

Method used

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  • Estimation method for polarization voltage of battery
  • Estimation method for polarization voltage of battery
  • Estimation method for polarization voltage of battery

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Embodiment Construction

[0018] A method for estimating battery polarization voltage, comprising the following steps:

[0019] S1, judging whether it is the first power-on;

[0020] S2. If the judging result in step S1 is the first power-on, the cell voltage difference V is estimated by the open-circuit voltage in the initialization stage. diff ;

[0021] If the judgment result in step S1 is not, then directly calculate the cell voltage difference V diff ;

[0022] V diff =IΔt / C diff +exp(-Δt / (τ t-Δt ))V diff，t-Δt ;

[0023] S3. Calculate the electric quantity U on the polarized capacitor cap ;

[0024]

[0025] S4. Calculate the polarization time length τ;

[0026] τ=R diff C diff ;

[0027] S5. Store τ.

[0028] For performance data on the estimation method, see figure 2 , Vdiff=Voff-Von.

[0029] The invention quickly finds out the initial state of the battery when it is powered on by means of comparison, thereby quickly determining the initial SOC state of the battery.

[0030...

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Abstract

The method for estimating the polarization voltage of the battery comprises the following steps: S1, judging whether the battery is powered on for the first time or not; S2, if the judgment result in the step S1 is the first power-on, estimating a single voltage difference Vdiff through an open-circuit voltage in an initialization stage; if the judgment result in the step S1 is not yes, directly calculating a single voltage difference Vdiff; S3, calculating the electric quantity Ucap on the polarization capacitor; S4, calculating the polarization time length tau; and S5, storing tau. According to the method, the initial power-on state of the battery is quickly found through a comparison means, so that the initial SOC state of the battery is quickly determined.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a method for estimating battery polarization voltage. Background technique [0002] The state of charge of the battery is one of the most important indicators of the remaining energy of the battery, and it is the most important indicator to ensure the safe use of the battery and prolong the battery life. The movement of the battery charge will create a polarization, which creates a polarization voltage. It is because of the existence of the polarization voltage that the state of charge (SOC) becomes complicated. Moreover, the magnitude of the polarization voltage and the length of the existence time are closely related to the temperature. Without an accurate estimate of the polarization voltage, it is impossible to accurately estimate the SOC. Contents of the invention [0003] The purpose of the present invention is to provide a method for estimating the battery polarization voltag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/3835G01R31/367
CPCG01R31/367G01R31/3648G01R31/3835
Inventor 林健田治学
Owner 巨伍汽车科技(昆山)有限公司
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