Battery health state estimation method and device based on on-line alternating current impedance
A technology of battery health status and AC impedance, which is applied in measurement devices, measurement of electricity, measurement of electric variables, etc., can solve the problem of inappropriate battery dynamic characteristics, and achieve the effect of improving accuracy and shortening estimation time.
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Embodiment 1
[0034] figure 1 Shown is a schematic flowchart of a method for estimating the state of health of a battery based on online AC impedance provided by an embodiment of the present invention.
[0035] figure 1 Said, the battery state of health estimation method based on the online AC impedance described in the present invention includes:
[0036] Step S01: Measure the online AC impedance of the battery. Wherein, optionally, the battery may be a lithium battery.
[0037] Step S02: converting the online AC impedance into equivalent element parameters.
[0038] Step S03: Obtain the state of health of the battery based on the equivalent element parameters and the association relationship with the state of health.
[0039] figure 2 What is shown is a schematic flowchart of a method for establishing an association relationship between an equivalent element and a battery health state provided by an embodiment of the present invention.
[0040] Such as figure 2 As shown, before o...
Embodiment 2
[0049] Step 1: Select a total of 21 frequencies within the range of online AC impedance frequency from 1000Hz to 0.1Hz, and superimpose these 21 frequencies into a waveform;
[0050] Step 2: Put the lithium-ion battery in a constant temperature environment of 25°C, let it stand for one hour, perform a 1C charge-discharge cycle on the lithium-ion battery, and calibrate the battery once every 100 cycles. Optionally, you can follow the "GB / T36276-2018 Lithium-ion Batteries for Electric Power Storage" for calibration, and record the calibrated capacity.
[0051] Step 3: After the calibration in step 2, during the battery charging process, use the waveform in step 1 to stimulate the battery, and measure the online AC impedance data at 60% state of charge;
[0052] Step 4: Construct an equivalent circuit diagram, use the equivalent circuit to fit the online AC impedance data of different cycle times in step 3 to equivalent component parameters, and extract the charge transfer inter...
Embodiment 3
[0057] The device 100 for estimating the state of health of a battery includes a measurement module 10 , a conversion module 20 and conversion of AC impedance into equivalent component parameters. Wherein, the measurement module 10 is configured to measure the online AC impedance of the battery; the conversion module 20 is configured to convert the online AC impedance into equivalent element parameters; The relationship gets the state of health of the battery.
[0058] After the measurement module 10 measures the online AC impedance of the battery, the conversion module 20 converts the online AC impedance into equivalent element parameters, and then the processing module 30 obtains the battery health status.
[0059] The processing module 30 is further configured to: charge the battery after each calibration; during the charging process, apply the excitation signal to the battery in a preset charge state or energy state, and obtain the online AC impedance data.
[0060] The...
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