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Low-temperature charging method for lithium-ion batteries with AC and DC superimposition

A lithium-ion battery and charging method technology, which is applied in the direction of secondary battery charging/discharging, secondary battery, secondary battery repair/maintenance, etc., can solve problems such as thermal runaway, lithium-ion battery safety hazards, etc., and achieve self-heating rate Fast, shortened charging time, and reduced internal resistance

Active Publication Date: 2020-09-15
LISHEN (QINGDAO) NEW ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium analysis will accelerate battery decline, and lithium metal may also puncture the diaphragm and cause internal short circuits in lithium-ion batteries, causing safety hazards, such as thermal runaway and other issues

Method used

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  • Low-temperature charging method for lithium-ion batteries with AC and DC superimposition
  • Low-temperature charging method for lithium-ion batteries with AC and DC superimposition
  • Low-temperature charging method for lithium-ion batteries with AC and DC superimposition

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Embodiment Construction

[0052] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0053] like figure 1 As shown, the low-temperature charging method of lithium-ion batteries with AC and DC superimposed in the present invention is mainly divided into three stages, the battery preheating stage, the "charging while heating" stage of AC and DC superimposed, and the three-stage reduced current DC charging stage , the specific steps are:

[0054] 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 polarization voltage amplitude according to the polarization voltage amplitude range;

[0055] S2. Under the sinusoidal AC polarization voltage amplitude, according to the relationship between the AC impedance and frequency of the lithium-ion battery, calculate the relationship between the heat production power and the frequency, and calculate...

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Abstract

The invention relates to a lithium ion battery low-temperature charging method with AC-DC superposition. The method comprises the steps of: S1, selecting a sinusoidal alternating current polarizationvoltage according to a safe polarization voltage range; S2, on the basis of S1, according to the relationship between the battery AC impedance and the frequency, calculating a relation of heat generation power and frequency, and calculating and obtaining the frequency when the current temperature battery heat generation power is maximum, wherein the power is the optimal heat generation frequency;S3, determining the maximum sinusoidal AC current amplitude according to the sinusoidal AC polarization voltage amplitude and the total AC impedance corresponding to the optimal heat generation frequency of the battery at the current temperature, and employing a symmetric sinusoidal alternating current signal to perform low-temperature self-heating for the battery; S4, when the battery temperaturereaches a preset cut-off temperature, applying one AC-DC superposition excitation at two ends of the lithium ion battery, and performing charging and reheating for the battery; and S5, when the voltage of the battery end in the S4 reaches the charge cut-off voltage, immediately converting the AC-DC superposition excitation to three-section current drop DC excitation to continuously charge the battery.

Description

technical field [0001] The invention relates to the technical field of battery charging, in particular to a low-temperature charging method for a lithium-ion battery under the AC-DC superposition working condition, which includes the AC self-heating of the lithium-ion battery, the AC-DC superposition charging process and the three-stage reduced current DC charging process. charging process. Background technique [0002] The deteriorating energy and environmental problems have promoted the rapid development of electric vehicles worldwide. Lithium-ion power batteries have become the most commonly used energy storage devices in electric vehicles, and their performance and working conditions determine the performance of the entire vehicle. [0003] At present, the main charging methods are constant current-constant voltage, pulse current charging, pulse voltage charging, trickle charging, and constant current charging. Among them, trickle charging is the simplest, because the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/615H01M10/625H01M10/633
CPCH01M10/44H01M10/615H01M10/625H01M10/633Y02E60/10
Inventor 孙丙香苏晓佳何锡添阮海军张维戈王占国周兴振
Owner LISHEN (QINGDAO) NEW ENERGY CO LTD
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