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Low-temperature self-heating method of lithium ion battery pack

A lithium-ion battery pack and self-heating technology, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of low heating efficiency of the battery pack, difficulty in heating the battery pack, and high cost, and achieve shortened self-heating time, heating The effect of good temperature uniformity and fast self-heating rate

Active Publication Date: 2017-08-11
BEIJING JIAOTONG UNIV +1
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Problems solved by technology

[0007] In view of the defects existing in the prior art, the object of the present invention is to provide a low-temperature self-heating method for lithium-ion battery packs, which can improve the problems in the prior art that it is difficult to heat the battery pack or the heating efficiency of the battery pack is low and the cost is high.

Method used

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  • Low-temperature self-heating method of lithium ion battery pack
  • Low-temperature self-heating method of lithium ion battery pack
  • Low-temperature self-heating method of lithium ion battery pack

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specific Embodiment

[0061] The following specific embodiments are described by taking a ternary-lithium manganate hybrid material power battery as an example.

[0062] During the charge and discharge process of the battery, there is a polarization voltage in the battery. The polarization voltage is used to describe the physical and chemical processes in the battery. due to hysteresis in electrochemical reactions. The battery impedance increases significantly at low temperature, such as figure 1 It is the EIS diagram of the 35Ah ternary-lithium manganese oxide hybrid material lithium-ion power battery at -20°C in different aging states. figure 1 It can be seen that there is no obvious relationship between battery impedance and battery aging. figure 2 It is the EIS diagram of the 35Ah ternary-lithium manganese oxide hybrid material lithium-ion power battery at different SOC at -20°C, by figure 2 It can be seen that the lower the SOC, the greater the battery impedance.

[0063] In order to ach...

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Abstract

The invention discloses a low-temperature self-heating method of a lithium ion battery pack. The low-temperature self-heating method comprises the steps of determining an optimal heating frequency range compatible with a battery aging state and state-on-charge (SOC) according to a principle of minimum influence on lifetime of a battery; designing a series resonant inversion circuit, and exploring an optimal control strategy so that the inversion circuit outputs a sine AC current of a target frequency and target amplitude at a battery side; and performing low-temperature self-heating on the battery pack by the sine AC current output from the resonant inversion circuit, wherein the internal resistance of the battery is gradually reduced with the temperature rising of the battery, the output current amplitude of the resonant inversion circuit is adaptively increased, the heating rate of the battery pack is improved, and the battery pack is rapidly raised to a target temperature. The low-temperature self-heating method has the effects of fast self-heating rate on the lithium ion battery pack under a low temperature, obvious improvement on low-temperature performance, high self-heating efficiency, no influence on service lifetime of the lithium ion battery, good heating temperature uniformity and the like, and the promotion and the application of an electric vehicle in a cold place are facilitated.

Description

technical field [0001] The invention relates to the technical field of battery pack heating, in particular to a low-temperature self-heating method for a lithium-ion battery pack, especially an efficient and reliable low-temperature self-heating method for a lithium-ion battery pack 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 slow internal chemical reaction kinetics and diffusion kinetics of lithium-ion batteries at low temperatures, the internal resistance increases tenfold, resulting in a serious decline in the energy conversion efficiency of lithium-ion batteries in cold environments...

Claims

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Application Information

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IPC IPC(8): H01M10/615H01M10/617H01M10/625H01M10/633H02M7/48
CPCH02M7/48H01M10/615H01M10/617H01M10/625H01M10/633H02M7/4815Y02B70/10Y02E60/10
Inventor 龚敏明阮海军姜久春孙丙香李雪飞张维戈吴健王占国
Owner BEIJING JIAOTONG UNIV
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