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A low-temperature rapid self-heating method for lithium-ion batteries

A lithium-ion battery, self-heating technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of uneven battery temperature distribution, large impact on battery life, low heat generation rate, etc., to achieve uniform heating temperature Good, fast self-heating rate, good temperature uniformity

Active Publication Date: 2017-11-03
BEIJING BEIJIAO NEW ENERGY TECH CO LTD
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Problems solved by technology

[0010] In view of the defects existing in the prior art, the purpose of the present invention is to provide a low-temperature rapid self-heating method for lithium-ion batteries, which improves the low efficiency of externally heating lithium-ion batteries in the prior art, which has a great impact on the service life of the battery and produces Problems such as low heat rate and uneven battery temperature distribution

Method used

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  • A low-temperature rapid self-heating method for lithium-ion batteries
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  • A low-temperature rapid self-heating method for lithium-ion batteries

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Embodiment Construction

[0045] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0046] Such as Figure 8 As shown, the low-temperature rapid self-heating method of the lithium-ion battery of the present invention is based on a sinusoidal AC signal with a constant polarization voltage peak and an optimal frequency to self-heat the lithium-ion battery. The specific steps are:

[0047] 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 voltage amplitude according to this range;

[0048] S2. Under the selected sinusoidal AC voltage amplitude, according to the relationship between battery impedance and frequency, calculate the relationship between heat production power and frequency and obtain the frequency point with the largest heat production power, that is, the optimal heat production frequency point (also known as is the optima...

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Abstract

The invention relates to a low-temperature rapid self-heating method for a lithium-ion battery. The method comprises the following steps: (S1) determining a polarization voltage amplitude range which does not have influence on the service lifetime of the lithium-ion battery and is safely used, and selecting a sine AC voltage amplitude according to the range; (S2) calculating the relationship between heat production power and frequency and obtaining a frequency point, namely the optimal heat production frequency point, with the maximum heat production power according to the relationship between battery impedance and frequency under the selected sine AC voltage amplitude; and (S3) carrying out heating free of lifetime loss on the battery by a sine AC signal according to the amplitude determined in the step (S1) and the frequency determined in the step (S2). The low-temperature rapid self-heating method for the lithium-ion battery has the effects of being high in heating rate, obvious in low-temperature performance improvement, free of an influence on the service lifetime of the lithium-ion battery, good in heating temperature uniformity and the like; and the target of reducing the influence on the service lifetime of the lithium-ion battery to the maximal extent is achieved.

Description

technical field [0001] The invention relates to the technical field of battery self-heating, in particular to a low-temperature rapid self-heating method for lithium-ion batteries. In particular, it refers to a low-temperature rapid self-heating method for a lithium-ion battery that has no effect on the life of the lithium-ion battery. Background technique [0002] The dual pressure of energy shortage and environmental pollution has boosted the rapid development of electric vehicles. Lithium-ion batteries have become the preferred battery for electric vehicles due to their advantages such as high single voltage, high energy density, long life, no memory effect, and no pollution. . [0003] However, due to the obvious decrease in the conductivity of the electrolyte and conductive materials at low temperatures, the chemical reaction kinetics and diffusion kinetics of lithium-ion batteries are significantly slow, and the internal resistance increases tenfold compared to room t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/615H01M10/625H01M10/6571
CPCH01M10/615H01M10/625H01M10/6571Y02E60/10
Inventor 阮海军吴健张维戈孟学东韩耸
Owner BEIJING BEIJIAO NEW ENERGY TECH CO LTD
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