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Optimization method for charging strategy of lithium-ion batteries

A lithium-ion battery and charging strategy technology, which is applied in the direction of secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve problems such as low cost, long charging time, and adverse effects on battery life, so as to ensure cycle performance, Reduce charging time, improve the effect of design and production technology

Active Publication Date: 2019-03-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the cost of constant current charging and constant current constant voltage charging is low, and the system circuit structure is simple, but the charging time is too long and the charging efficiency is not high.
The constant high current charging method and pulse charging solve the problem of long charging time, but it is not easy to control the charging degree and has an adverse effect on battery life
The staged charging method has obvious advantages, and most of the vehicle charging strategies also adopt a similar method. However, due to the differences in the design and manufacturing process of the batteries of various battery manufacturers, it is impossible to solidify and obtain a unified charging method.

Method used

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  • Optimization method for charging strategy of lithium-ion batteries
  • Optimization method for charging strategy of lithium-ion batteries
  • Optimization method for charging strategy of lithium-ion batteries

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Embodiment Construction

[0017] Such as figure 1 as shown, figure 1 It is a flow chart of an optimization method for a lithium-ion battery charging strategy proposed by the present invention.

[0018] The optimization method of a lithium-ion battery charging strategy proposed by the present invention is realized through the following three stages:

[0019] The first stage: the determination of the maximum allowable continuous charging rate C1 and lithium analysis charging rate C2 in the full SOC range (0%-100%).

[0020] (1) Choose a cylindrical lithium iron phosphate battery with a rated capacity of 14Ah and a working voltage range of 2.0-3.65V. Use laser welding copper tabs on the poles to measure whether the voltage, internal resistance, and thickness of the battery meet the product specification range , to select qualified batteries within the specification range;

[0021] (2) Select the battery to discharge to 2.0V at 1C, so that the battery is in an empty state, and use different batteries at...

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Abstract

The invention discloses an optimization method for the charging strategy of lithium-ion batteries. In a first stage, the lithium precipitation charging rate C2 is determined. In a second stage, the non-lithium-precipitation SOC1 under the lithium precipitation charging rate C2 is determined. In a third stage, the non-lithium-precipitation charging rate C3 under high voltage is determined. According to the optimization method for the charging strategy of lithium-ion batteries disclosed by the invention, a reasonable battery charging strategy is determined by determining the allowable maximum continuous rate of battery charging and the corresponding cut-off SOC state. The method is simple and fast, has guiding significance for the selection of the charging rate parameters of a vehicle charging strategy, ensures the cycle performance of batteries, reduces the actual charging time of batteries, can be used in the benchmarking of the charging performance of batteries from different manufacturers, and is conducive to improving battery design and manufacture technologies.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to an optimization method for charging strategies of lithium ion batteries. Background technique [0002] Lithium-ion power battery is an important part of electric vehicles, and its performance directly affects the normal use of electric vehicles. Because of its popularization and application, its cruising range and long charging time are problems that need to be solved urgently. With the reduction of subsidy policy and the improvement of cruising range, the energy density of batteries is required to gradually increase. At present, battery manufacturers mainly increase the specific energy density of the battery by reducing the weight of structural parts, increasing the proportion of active materials, increasing the volume of the battery cell, increasing the compaction density, and reducing the amount of liquid injection; There is a corresponding decrease in performance ...

Claims

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Application Information

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IPC IPC(8): H01M10/44
CPCH01M10/44Y02E60/10
Inventor 丁浩
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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