Lithium ion battery low-temperature charging method with AC-DC superposition
A technology of lithium ion battery and charging method, which is applied in the direction of secondary battery charging/discharging, secondary battery, secondary battery repair/maintenance, etc., can solve the problems of thermal runaway, safety hazards of lithium ion battery, etc. Faster, shorter charging time, less risk
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[0052] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0053] like figure 1 As shown, the low-temperature charging method of lithium-ion batteries with AC and DC superimposed in the present invention is mainly divided into three stages, the battery preheating stage, the "charging while heating" stage of AC and DC superimposed, and the three-stage reduced current DC charging stage , the specific steps are:
[0054] S1. Determine the polarization voltage amplitude range that has no impact on the life of the lithium-ion battery and is safe to use, and select the sinusoidal AC polarization voltage amplitude according to the polarization voltage amplitude range;
[0055] S2. Under the sinusoidal AC polarization voltage amplitude, according to the relationship between the AC impedance and frequency of the lithium-ion battery, calculate the relationship between the heat production power and the frequency, and calculate...
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