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A kind of 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: 2019-08-02
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.

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  • A kind of low-temperature self-heating method of lithium-ion battery pack
  • A kind of low-temperature self-heating method of lithium-ion battery pack
  • A kind of 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] There is a polarization voltage in the battery during the charging and discharging process of the battery. The polarization voltage is used to describe the physical and chemical processes in the battery. caused by hysteretic electrochemical reactions. The battery impedance increases significantly at low temperature, such as figure 1 is the EIS diagram of the 35Ah ternary-lithium manganate mixed material lithium-ion power battery under different aging states at -20 °C, given by figure 1 It can be seen that there is no obvious relationship between battery impedance and battery aging. figure 2 is the EIS diagram of the 35Ah ternary-lithium manganate mixed material lithium-ion power battery at different SOC at -20 °C, which is represented by figure 2 It can be seen that the lower the SOC, the greater the battery impedance.

[006...

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Abstract

The invention discloses a low-temperature self-heating method for a lithium-ion battery pack. Based on the principle of minimum impact on battery life, the optimal heating frequency range is determined taking into account both the aging state of the battery and the SOC; a series resonant inverter circuit is designed to explore the optimal control The strategy makes the inverter circuit output the sinusoidal AC current with target frequency and target amplitude on the battery side; the sinusoidal AC current output by the resonant inverter circuit is used to self-heat the battery pack at low temperature. As the battery temperature increases, the internal resistance of the battery gradually increases. The resonant inverter circuit adaptively increases the output current amplitude, increases the heating rate of the battery pack, and quickly raises the battery pack to the target temperature. The invention has the effects of fast self-heating rate of lithium-ion battery packs at low temperatures, obvious improvement in low-temperature performance, high self-heating efficiency, no influence on the service life of lithium-ion batteries, and good heating temperature uniformity, and will promote the use of electric vehicles in cold regions. Promote apps.

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 pack. Background technique [0002] The dual pressures of energy shortage and environmental pollution have promoted the rapid development of electric vehicles. Lithium-ion batteries have become the preferred battery for electric vehicles due to their advantages of high single voltage, high energy density, long life, no memory effect, and no pollution. . [0003] However, the internal resistance of lithium-ion batteries increases tenfold due to the obvious sluggishness of chemical reaction kinetics and diffusion kinetics inside the battery at low temperature, resulting in a serious decrease in the energy conversion efficiency of lithium-ion...

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Application Information

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Patent Type & Authority Patents(China)
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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