Battery state evaluation method and device
A battery status and evaluation method technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of energy storage system downtime, affecting system operation, and a large number of batteries, and achieve many users, broad application prospects, and universal high adaptability
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Embodiment 1
[0049] see figure 1 As shown, the present invention provides a battery state evaluation method for evaluating the state of health (SOH) of the battery working state, comprising the following steps:
[0050]S1. Measure the AC impedance spectrum of the working state lithium-ion battery under the same SOH under different states of charge (State of Charge, SOC); repeat S1 to obtain the AC impedance under different states of charge (State of Charge, SOC) under different SOH Spectrum;
[0051] S2. Establish an equivalent circuit, select the data set in the AC impedance spectrum under a certain SOC to input the equivalent circuit for fitting, and obtain the parameters of each equivalent element of the equivalent circuit under the SOC; repeat this step to obtain all the parameters under the SOC The parameters of each equivalent element of the equivalent circuit; the data in the data set includes frequency and its corresponding real part and imaginary part; the equivalent circuit stru...
Embodiment 2
[0058] see figure 1 As shown, the present invention provides a battery state evaluation method for evaluating the state of health (SOH) of a battery in a non-working state, comprising the following steps:
[0059] S1. Measure the AC impedance spectrum of the non-working lithium-ion battery under the same SOH under different states of charge (State of Charge, SOC); repeat S1 to obtain the AC impedance spectrum under different states of charge (State of Charge, SOC) under different SOH Impedance spectrum;
[0060] S2. Establish an equivalent circuit, select the data set in the AC impedance spectrum under a certain SOC to input the equivalent circuit for fitting, and obtain the parameters of each equivalent element of the equivalent circuit under the SOC; repeat this step to obtain all the parameters under the SOC The parameters of each equivalent element of the equivalent circuit; the data in the data set includes frequency and its corresponding real part and imaginary part;
...
Embodiment 3
[0064] see figure 1 As shown, the present invention provides a battery state evaluation method for evaluating the state of health (SOH) of a battery in a non-working state, comprising the following steps:
[0065] S1. Apply an excitation signal (the excitation current is 1A, and the frequency is 10kHz-0.001Hz) to measure the AC impedance spectrum under different SOH and different State of Charge (SOC) of the non-working lithium-ion battery;
[0066] S2. Establish an equivalent circuit, select the data set in the AC impedance spectrum under a certain SOC to input the equivalent circuit for fitting, and obtain the parameters of each equivalent element of the equivalent circuit under the SOC; repeat this step to obtain all the parameters under the SOC The parameters of each equivalent element of the equivalent circuit; the data in the data set includes frequency and its corresponding real part and imaginary part;
[0067] S3. Under the same SOC, the parameters of each equivalent...
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