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Stress-regulated rapid charging method for long-life lithium ion battery

A lithium-ion battery, fast charging technology, applied in the direction of secondary battery charging/discharging, secondary battery, secondary battery repair/maintenance, etc., can solve problems such as no solution, low cost, simple and easy method Effect

Active Publication Date: 2021-07-23
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is particularly important to design a fast charging protocol from the perspective of preventing the mechanical failure of cathode particles. It is extremely effective for increasing the charging rate of power batteries without causing loss of capacity utilization and cycle stability, but there is no effective solution yet. solution

Method used

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  • Stress-regulated rapid charging method for long-life lithium ion battery
  • Stress-regulated rapid charging method for long-life lithium ion battery
  • Stress-regulated rapid charging method for long-life lithium ion battery

Examples

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Effect test

Embodiment 1

[0043] In this embodiment, a stress-regulated long-life lithium-ion battery fast charging method divides the charging process into two stages, the first stage is high-current constant current charging, the second stage charging current changes with time, and charging The charging current gradually decreases during the process.

[0044] The method of this embodiment directly optimizes the charging rate of the battery from the perspective of preventing battery cycle performance degradation, and improves the charging rate to the maximum efficiency within a critical range. The charging method in this embodiment does not involve changes in electrode materials, and can be applied to various power batteries.

Embodiment 2

[0046] This embodiment is basically the same as Embodiment 1, especially in that:

[0047] In this embodiment, the high current in the first stage is the safe upper limit of the current used by the battery and the charging device.

[0048]In this embodiment, the time-varying charging current in the second stage is designed according to the theoretical model of the diffusion-induced stress of the electrode active particles. In the theoretical model, the maximum tensile stress on the surface of the electrode active particles quickly reaches a critical value in the first stage of charging And stay at this value during the second stage of charging. critical value It is set according to different battery charge and discharge data and optimization requirements. The variable current curve in the second stage of charging can be approximately fitted as an exponential curve. The expression of charging current exponential curve is I 2 =(I 1 -I end )×exp[-a(t-t 1 )]+I end , whe...

Embodiment 3

[0052] This embodiment is basically the same as the above-mentioned embodiment, and the special features are:

[0053] In this embodiment, a stress-regulated fast charging method that takes both capacity utilization and cycle stability into account, the charging current can be set by equation (5). In addition, a fine-tuning constant-current exponential current charging scheme that is easier to set the charging current is proposed, and the charging current can be set by equation (6). The parameters in the equation are all set according to the specific application of the lithium battery.

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Abstract

The invention provides a stress-regulated rapid charging method for a long-life lithium ion battery. The charging process is divided into two stages: the first stage is high-current constant-current charging, and in the second stage, the charging current continuously changes along with time, and the charging current is gradually reduced in the charging process. The invention provides a stress-regulated lithium ion battery rapid charging strategy capable of avoiding rapid degradation. The lithium ion battery rapid charging strategy effectively improves the lithium battery charging rate without sacrificing the battery capacity utilization rate and the cycling stability. According to the protocol provided by the invention, the charging time is greatly shortened without sacrificing the cycling stability and the capacity utilization rate.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a stress-controlled fast charging method for long-life lithium ion batteries, which effectively improves the charging rate of lithium batteries without sacrificing battery capacity utilization and cycle stability. Background technique [0002] Lithium-ion batteries (LIBs) have been widely used in various types of devices due to their high energy density, high power, and no memory effect. However, fast charging of Li-ion batteries has been one of the most important challenges for the practical application of Li-ion batteries in devices, especially electric vehicles. Considering the long development cycle of fast-charging new material systems, developing a suitable fast-charging protocol has become a top priority. [0003] Generally speaking, the standard charging protocol for lithium-ion batteries is constant current and constant voltage charging. Obviously, the chargin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44G06F17/11G06F30/25
CPCH01M10/44H01M10/446G06F30/25G06F17/11Y02E60/10
Inventor 吕浡张俊乾高尔越
Owner SHANGHAI UNIV
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