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A method to realize the rapid measurement of the maximum allowable power of charging and discharging lithium-ion batteries
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A maximum allowable, charging and discharging technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of many initial parameters, not extended to module testing, complex model construction, etc., to achieve the effect of ensuring speed and accuracy
Active Publication Date: 2022-03-01
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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[0004] However, the current method requires more initial parameters, the model construction is more complicated, and only involves online estimation, and no adjustment formula is given in the actual test process
This method is only suitable for power estimation of lithium-ion battery cells, and has not been extended to module testing
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example 1
[0045] Select the current 25 ° C to 50%, uaim = 4.2V as the initial value of the status variable, and measure the maximum power of 10s at this time.
[0046] The loop equation group, so that SOC1 = 50%, T = 10s, solved the maximum value of the charging current.
[0047] Calculate P = I * UAIM, and set the experimental parameters, record the voltage value at the end of the 10s constant power charging.
[0048] The voltage value ends the experiment and records the experimental data over the acceptable range.
example 2
[0050] Select the current 25 ° C SOC = 50%, UAIM = 2.5V as the initial value of the state variable, and measure the maximum power of 10s at this time.
[0051] The loop equation group, so SOC1 = 50%, t = 10s, solved the maximum value of the tenth discharge current.
[0052] Calculate P = I * UAIM, and set the experimental parameters, record the voltage value at the end of the 10s constant powerdischarge.
[0053] Voltage value> UAIM, according to the adjustment formula:
[0054] Δi = (u2-uaim) / R1,
[0055] I2 = i1 + Δi,
[0056] P2 = uaim * i2,
[0057] Calculate P2, re-adjust the battery SOC = 50%, reset the experimental parameter again;
[0058] The resulting result 10s constant power discharge ends the voltage value within the required range, end the experiment, and record the experimental data.
[0059] Those skilled in the art will appreciate that all or part of the flow in the above embodiment method is to be done by a hardware that can be related to instructions by a comp...
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Abstract
The invention discloses a method for quickly detecting the maximum allowable power of a lithiumionbattery cell (module) under different temperature conditions, including: establishing a simplified physical model of the battery according to the charging and discharging characteristics of the lithiumion battery, and calculating the charge of the battery State of charge, ohmic internal resistance and process polarization voltage; use the simplified physical model of the battery, take the state of charge and ohmic internal resistance as the initial conditions, and solve the simultaneous state equations, and verify and adjust through actual experiments to achieve the maximum lithium-ion battery Fast measurement of power state; overcome the problem that the maximum allowable charging and discharging power measurement is restricted by the coupling of factors such as working conditions, temperature, state of charge and attenuation, and ensure the speed and accuracy of measurement.
Description
Technical field [0001] The present invention relates to the field of battery parameter testing, and in particular, to a method for realizing rapid measurement of the maximum allowable power of lithium ion batterycharge and discharge. Background technique [0002] As one of the main functions of the lithium ion batterymanagement system, the maximum allowable power test is within the defined operating current and voltage range, the lithium ion battery can be detected in the current working state, and the electric vehicle is detected. Energy management. The maximum allowed discharge power determines the real-time acceleration characteristics of electric vehicles, and maximum allowable charging power determines the absorption capacity of brake feedback energy. The maximum allowable power is the stealth state of the lithium-ion battery, the coupling constraints such as working conditions, temperature, charged state and attenuation, unable to use mathematical expressions to the unifi...
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