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Lithium battery pack multi-target simultaneous charging method

A lithium battery pack and charging method technology, applied in the direction of secondary battery charging/discharging, secondary battery, secondary battery repair/maintenance, etc., can solve the problem of slow charging speed, low efficiency, inability to eliminate battery charging polarization, etc problem, to minimize the difference between charging time and convergence time

Active Publication Date: 2020-06-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most widely used charging method is the three-stage charging method, which has problems such as slow charging speed, low efficiency, and inability to eliminate the polarization phenomenon during battery charging.

Method used

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  • Lithium battery pack multi-target simultaneous charging method
  • Lithium battery pack multi-target simultaneous charging method
  • Lithium battery pack multi-target simultaneous charging method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0056] The present invention will be further described below in conjunction with drawings and embodiments.

[0057] The embodiment implemented according to the method of the present invention is as follows:

[0058] The lithium battery pack in this experiment consists of four lithium batteries. The capacity and nominal voltage of the battery are 3100mAh and 3.7V, respectively. The current working range of the battery is [-1A, 0], the sampling time is T=1s, and the upper and lower bounds of SOC are set as 100% and 5%. The initial SOC of each battery in the battery pack is:

[0059] SOC 1 (0)=51%, SOC 2 (0)=60%, SOC 3 (0)=50%, SOC 4 (0) = 62%.

[0060] In this embodiment, through the global optimization control setting, if the SOC difference between any two single cells is less than 0.1%, the battery charging process will stop.

[0061] 2. Experimental results

[0062] This embodiment calculates and obtains the preset charging current sequence in real time to charge the...

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Abstract

The invention discloses a lithium battery pack multi-target simultaneous charging method. The method comprises: converting energy loss and a charging current into a lithium battery pack charging costmodel with a charging weight coefficient, and adopting an interior point method for solving and processing to obtain a preset charging current sequence; then, according to a preset charging current sequence, calculating the charging time required for charging the lithium battery pack; adjusting a charging weight coefficient in the lithium battery pack charging cost model through an adaptive momentum steepest descent algorithm, and obtaining a charging weight coefficient under the condition of the shortest charging time; and optimizing the charging cost model of the lithium battery pack by utilizing the charging weight coefficient to obtain a new preset charging current sequence, and charging by utilizing the new preset charging current sequence, so that the optimized multi-target simultaneous charging of the lithium battery pack is realized. According to the invention, the error between the charging time and the convergence time is greatly reduced, so that the influence of the currenton the battery is reduced to the maximum extent while the charging efficiency is ensured.

Description

technical field [0001] The invention belongs to a lithium battery charging method in the application field of lithium batteries, and in particular relates to a multi-target simultaneous charging method for a lithium battery pack. Background technique [0002] Lithium batteries have the advantages of high power density, high energy density, long cycle life, high output voltage, and environmental protection. They are widely used in various fields. Improving the charging rate, service life and available capacity of lithium batteries is a current research hotspot. At present, there are many charging methods for lithium batteries. Traditional chargers have a single charging mode and fixed parameters, and do not fully consider the real state of the battery. The charging process will damage the battery. The charging and discharging process of lithium battery is an electrochemical reaction process, and its charging characteristics are related to factors such as the internal structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44
CPCH01M10/441Y02E60/10H02J7/0048H02J7/00712H02J7/0013H02J7/0071H02J7/04G01R31/367G01R31/378
Inventor 陈剑陈浩范晓东周宓付源
Owner ZHEJIANG UNIV