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Variable-frequency and variable-amplitude AC low-temperature self-heating method of lithium ion battery

A lithium-ion battery and self-heating technology, which is applied to secondary batteries, circuits, electrical components, etc., can solve the problems of uneven battery temperature distribution, large impact on battery life, and low heat generation rate, and shorten the self-heating time , fast heat production rate, fast self-heating rate

Active Publication Date: 2019-03-08
LISHEN (QINGDAO) NEW ENERGY CO LTD
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AI Technical Summary

Problems solved by technology

[0005] In view of the defects in the prior art, the purpose of the present invention is to provide a low-temperature self-heating method for lithium-ion batteries with frequency-variable-amplitude alternating current, which improves the low efficiency of externally heating lithium-ion batteries in the prior art and has a great impact on battery life. , low heat generation rate and uneven battery temperature distribution

Method used

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  • Variable-frequency and variable-amplitude AC low-temperature self-heating method of lithium ion battery
  • Variable-frequency and variable-amplitude AC low-temperature self-heating method of lithium ion battery
  • Variable-frequency and variable-amplitude AC low-temperature self-heating method of lithium ion battery

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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] Such as Figure 5 As shown, the low-temperature self-heating method of variable frequency and amplitude of the lithium-ion battery described in the present invention is based on a sinusoidal AC signal with a constant sinusoidal AC polarization voltage amplitude and an optimal heating frequency to self-heat the lithium-ion battery. The specific steps are:

[0039] 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, and according to the sinusoidal AC polarization voltage amplitude and the current The internal resistance of the battery at temperature determines the amplitude of the sinusoidal alternating current;

[0040] S2. Under the selected sinusoidal AC pol...

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Abstract

The invention relates to a variable-frequency and variable-amplitude AC low-temperature self-heating method of a lithium ion battery. The variable-frequency and variable-amplitude AC low-temperature self-heating method comprises the steps of determining a polarization voltage amplitude range having no influence on lifetime of a lithium ion battery, selecting sine AC polarization voltage amplitudeaccording to the range, and determining sine AC current amplitude according to the sine AC polarization voltage amplitude and battery internal resistance under a current temperature; calculating to obtain a frequency at which heating power is maximum under the current temperature according to a relation between the heating power and the frequency and a relation between battery impedance and the frequency under the selected sine AC polarization voltage amplitude; performing low-temperature self-heating on the battery by a sine AC current signal according to the determined amplitude and the frequency; compensating the sine AC current amplitude per certain temperature in real time under the condition that constant polarization voltage amplitude is ensured, finding out optimal heating frequency under the current temperature, and changing the amplitude and the frequency of the applied sine AC current signal. The variable-frequency and variable-amplitude AC low-temperature self-heating method has the advantages of good self-heating rate, no influence on service lifetime of the battery and good heating temperature uniformity.

Description

technical field [0001] The invention relates to the technical field of battery self-heating, in particular to a low-temperature self-heating method for a lithium-ion battery under variable-frequency and variable-amplitude AC working conditions. In particular, it refers to the low-temperature self-heating method of lithium-ion batteries under the condition of variable-frequency and variable-amplitude AC, which has no effect on the life of lithium-ion batteries. Background technique [0002] The dual pressure of energy crisis and environmental protection has boosted the rapid development of electric vehicles. Lithium-ion batteries have become the first choice for electric vehicle power batteries due to their advantages such as high energy density, long service life, energy saving and environmental protection. However, due to the variation of parameters with conditions, there are still some challenges in the practical application of Li-ion batteries. In a low temperature envi...

Claims

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Application Information

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IPC IPC(8): H01M10/615H01M10/625H01M10/654
CPCH01M10/615H01M10/625H01M10/654Y02E60/10
Inventor 孙丙香张琳静何锡添张彩萍阮海军张维戈王占国黄彧周兴振
Owner LISHEN (QINGDAO) NEW ENERGY CO LTD
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