A method of obtaining battery remaining energy based on soc-ocv curve
A SOC-OCV, residual energy technology, applied in the measurement of electrical variables, measuring electricity, measuring devices, etc., can solve problems such as time-consuming and labor-intensive residual energy, and achieve the goal of reducing resource release, resource consumption, and computational complexity. Effect
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Embodiment 1
[0044]A method to obtain the remaining battery energy based on the SOC-OCV curve, such asfigure 1 As shown, including the following steps:
[0045]S1. Use the charge and discharge cabinet and the high and low temperature box to obtain the SOC-OCV curve at different temperatures;
[0046]Through the temperature-capacity curve and temperature-energy curve, the rated capacity (Q0 in Formula 1) and the total energy of the battery (TotalEnergy in Formula 2) at each temperature can be obtained;
[0047]S2. Calculate the remaining energy of each SOC corresponding point in the SOC-OCV curve at different temperatures according to the following formula, such asfigure 2 Shown:
[0048]S21. First calculate the battery's released energy UsedEnergy:
[0049]
[0050]S22. Recalculate the remaining energy of the battery LeftEnergy:
[0051]LeftEnergy=(TotalEnegry-UsedEnergy)×SOH formula (2)
[0052]In formula (1) and formula (2): UaIs the voltage corresponding to the state of charge of a, UbIs the voltage corresponding to...
Embodiment 2
[0107]Embodiment 2 is further optimized on the basis of the solution of embodiment 1, and the interval between the two states of charge a and b is set to 5%-10%, preferably 5% and 10%.
[0108]For the integral itself, the more intervals are divided, the higher the accuracy; but for the SOC-OCV curve, too many intervals will increase the test workload. A large number of experimental studies have found that when the SOC test interval is selected from 5% to 10%, it is possible to ensure the calculation accuracy of the remaining energy and reduce the test workload.
Embodiment 3
[0110]Embodiment 3 is further optimized on the basis of embodiment 1. In step S2, a process of self-learning the SOC-OCV curve at different temperatures is added. The specific steps are as follows:
[0111]S23. Calculate the actual energy released by the battery:
[0112]When the SOC is 90%, the actual energy released by the battery at this time is:
[0113]In the formula: U is the voltage at the current moment, I is the current at the current moment, dt is the task operating period for calculating the accumulated discharge energy, and T1SOC90_T, which means the time from full charge to discharge to SOC 90%;
[0114]S24. Replace UsedEnergy with E, and put into formula (2) to get the remaining energy LeftEnergy corresponding to 90% SOCSOC_90 ’;
[0115]S25, calculate LeftEnergySOC_90 ’And LeftEnergySOC_90 The difference between ΔE, when ΔE is greater than 3% TotalEnenrgy*SOH, 90% SOC at the current temperature corresponds to the new remaining energy NewLeftEnergySOC_90 Use LeftEnergySOC_90 ’Instead...
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