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A kind of low temperature self-heating method of lithium ion battery

A lithium-ion battery, self-heating technology, applied in battery temperature control, secondary batteries, circuits, etc., can solve the problems of high cost of low-temperature performance, large impact on battery life, and low efficiency of external heating methods, and achieve charging performance improvement , internal resistance reduction, the effect of reducing impact

Active Publication Date: 2016-07-06
BEIJING BEIJIAO NEW ENERGY TECH CO LTD
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a low-temperature self-heating method that has no effect on the life of lithium-ion batteries, which can improve the low-temperature performance of lithium batteries from the material alone. The cost is high, and the external heating method has low efficiency and has a great impact on battery life The problem

Method used

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  • A kind of low temperature self-heating method of lithium ion battery
  • A kind of low temperature self-heating method of lithium ion battery
  • A kind of low temperature self-heating method of lithium ion battery

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with a set of embodiments and accompanying drawings.

[0038] The battery in this embodiment may be a lithium manganese oxide power battery, a lithium iron phosphate power battery, a ternary material power battery, etc. used in electric vehicles. Take lithium manganate-ternary hybrid material power battery as an example for illustration.

[0039] When the SOC of the lithium-ion battery is 50%, several representative temperature points are selected for impedance spectroscopy test. In this embodiment, the electrochemical workstation is used to test the performance of the lithium-ion battery at -10°C, 0°C, and 25°C. Electrochemical Impedance Spectroscopy, the curve of impedance changing with frequency is obtained as figure 2 As shown, the results show that: at each temperature, as the frequency increases, the impedance of the lithium-ion battery first decreases and then increases, so it can be basically...

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Abstract

The invention discloses a low-temperature self-heating method for a lithium ion battery. The method comprises the steps of determining a frequency range in which the service life of the lithium ion battery cannot be affected, and selecting frequencies of charging and discharging pulses according to the range; setting a pulse current amplitude value selection basis under a selected charging and discharging mode, and calculating a charging current amplitude value Ic and a discharging current amplitude value Id; performing no-life-loss heating on the battery to be heated according to charging and discharging pulse signals of the determined frequencies and the amplitude values, wherein the inner resistance of the self-heated battery is greatly reduced, and the charging performance is greatly improved. According to the technical scheme, the low-temperature self-heating method has the effects of high self-heating speed, obvious low-temperature performance improvement and no influence on the service life of the battery.

Description

technical field [0001] The invention relates to a battery self-heating method, in particular to a low-temperature self-heating method that does not affect the life of a lithium-ion battery. Background technique [0002] Under the dual pressure of energy crisis and environmental protection, the rapid development of electric vehicles is imperative. Lithium-ion batteries have the advantages of environmental protection, no memory effect, high charge and discharge rate, long life, high energy density / power density, etc. Compared with lead-acid batteries, nickel-cadmium batteries and nickel-metal hydride batteries, they are more suitable for power drive. However, the low-temperature performance of lithium-ion batteries is extremely deteriorated, the impedance is doubled, the charge and discharge capacity and energy are greatly reduced, and the ability to accept high-rate charge and discharge currents is also sharply reduced. These seriously damage the power performance, mileage a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/615H01M10/63H01M10/625
CPCY02E60/10
Inventor 阮海军姜久春孙丙香王占国陈大分韩智强
Owner BEIJING BEIJIAO NEW ENERGY TECH CO LTD
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