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Low-temperature self-heating method for lithium ion battery

A lithium-ion battery and heating method technology, applied in battery temperature control, secondary batteries, circuits, etc., can solve the problems of large impact on battery service life, low efficiency of external heating methods, high low temperature performance cost, and achieve improved charging performance, Reduced impact, fast self-heating effect

Active Publication Date: 2014-09-24
BEIJING BEIJIAO NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

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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  • Low-temperature self-heating method for lithium ion battery
  • Low-temperature self-heating method for lithium ion battery
  • Low-temperature self-heating method for 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, with the increase of the frequency, the impedance of the lithium-ion battery first decreases and then increases, so it can be b...

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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 Applications(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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