Rapid charging control method for lithium battery pack based on charging and equalization combination optimization

A lithium battery pack, combined optimization technology, applied in the direction of charge equalization circuit, battery circuit device, secondary battery charging/discharging, etc., can solve the problem of increasing hardware cost and so on

Active Publication Date: 2020-09-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
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Problems solved by technology

However, it will significantly increase the hardware cost compared to conventional battery chargers

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  • Rapid charging control method for lithium battery pack based on charging and equalization combination optimization
  • Rapid charging control method for lithium battery pack based on charging and equalization combination optimization
  • Rapid charging control method for lithium battery pack based on charging and equalization combination optimization

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Embodiment Construction

[0067] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0068] According to the present invention, a lithium battery pack fast charging control method based on charging and equalization combination optimization, the specific steps are as follows:

[0069] 1) Establish a combined charging system model for charging and equalization, and obtain the charging current model and lithium battery pack charging model;

[0070] For such as figure 1 The charging equalization combined charging system shown is mainly composed of a battery pack in series, a charger, and n-1 equalizers, where n represents the number of batteries in the battery pack. For the i-th equalizer, bidirectional equalization between the i-th battery and the i+1-th ...

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Abstract

The invention discloses a rapid charging control method for a lithium battery pack based on charging and equalization combination optimization. The method specifically comprises the steps of firstly building a charging and equalization combination charging system model, and obtaining a charging current model and a lithium battery pack charging model; then establishing a charging objective functionand a charging constraint condition; and finally, determining a minimum charging time optimization problem with a final state constraint condition, solving by adopting a double-layer optimization algorithm, solving optimal charging current and equalizing current at a bottom layer, and solving optimal charging time at a top layer. According to the invention, a charging and equalization combined charging system and a double-layer optimization algorithm are adopted, so that the hardware cost can be reduced, and the state of charge of the lithium battery pack can reach an expected value in the shortest charging time on the premise of ensuring the charging safety constraint.

Description

technical field [0001] The invention relates to a fast charging control method for a lithium battery pack, in particular to a fast charging control method for a lithium battery pack based on combined optimization of charging and equalization, and belongs to the technical field of battery pack charging control. Background technique [0002] As one of the most widely used sustainable energy storage devices, rechargeable lithium batteries have been widely used in many industries such as electric vehicles (EVs) and microgrids due to their high energy density and long cycle life. [0003] Charging is an important process for lithium batteries to replenish and store energy, and the quality of the charging strategy greatly affects the performance and life of lithium batteries. Improper charging behavior, such as overcharging or overcurrent charging, will lead to the precipitation and crystallization of lithium ions inside the battery, increase the internal pressure, and increase th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/44
CPCH02J7/0014H02J7/0048H02J7/0071H02J7/00712H01M10/441Y02E60/10
Inventor 欧阳权徐国团王志胜马瑞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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