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Two-layer MPC method for improved module-based CPC equalization system

An equalization system, equalization technology, applied in charge equalization circuit, arrangement of multiple synchronous batteries, cell structure combination, etc., can solve battery current exceeding, battery pack safety and health hazards, lack of modular design and integrated infrastructure, etc. problems, to achieve the effect of convenient maintenance and simple modular structure

Pending Publication Date: 2021-10-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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AI Technical Summary

Problems solved by technology

However, traditional CPC equalization systems are not suitable for direct use in large battery packs because the high voltage on the side of the battery pack would place a huge burden on the equalizer hardware
In addition, traditional CPC equalization systems lack modular design and integrated infrastructure
Secondly, the current constraints of the battery are not considered in the existing related work, and the design of the equalization current has nothing to do with the operating current of the battery pack, which leads to the fact that when the operating current of the battery pack is too large, the equalization current independent of the operating current of the battery pack will cause The current of the battery exceeds its allowable limit, which poses a potential safety and health hazard to the battery pack

Method used

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  • Two-layer MPC method for improved module-based CPC equalization system

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Embodiment Construction

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. 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.

[0029] Aiming at the problem of battery balancing, the present invention discloses a two-layer MPC strategy aiming at an improved module-based CPC balancing system, comprising the following steps:

[0030] 1) Establish an improved module-based CPC balance system model;

[0031] Such as figure 1 As shown, it is the circuit diagram of the improved module-based CPC equalization system, which is divided into m battery modules, each battery module contains n batteries, and the circuit also contains m-1 ML equalizers M ei , m CMC equalizers e ...

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Abstract

The invention discloses a two-layer MPC method for an improved module-based CPC equalization system, provides an improved module-based CPC equalization system for battery equalization, and provides a two-layer MPC strategy based on a model and constraint conditions of the system. The method specifically comprises the steps that 1) an improved module-based CPC equalization system model is established, an ML equalizer is used for equalizing the SOC between battery modules, and a CMC equalizer is used for equalizing the SOC between batteries in each module; and 2) a two-layer MPC strategy composed of a top-layer MPC algorithm and a bottom-layer MPC algorithm is provided, the top-layer MPC algorithm is used for designing an ML equalizer, and the bottom-layer MPC algorithm is used for designing a CMC equalizer. The method has the advantages of being simple in modular structure and convenient to maintain, is suitable for the battery pack composed of a plurality of batteries connected in series, can meet the current limitation of the batteries, effectively increases the available capacity of the battery pack, reduces the calculation complexity, and enables real-time battery equalization in practical application to be more feasible.

Description

technical field [0001] The invention relates to a two-layer MPC method for an improved module-based CPC equalization system, which belongs to the technical field of batteries. Background technique [0002] In recent years, electric vehicles have attracted a lot of attention due to their advantages of zero emission and high efficiency. Therefore, it is of great value to provide efficient and reliable rechargeable Li-ion batteries and battery management systems for electric vehicles. However, due to the electrochemical limitation of the battery, a lithium-ion battery can only provide a voltage in the range of 2.5V-4.2V, which is not enough to meet the high voltage requirements of electric vehicles. In practical applications, batteries are usually connected in series as a battery pack to provide high voltage. [0003] Because there is no guarantee that the characteristics of each cell in the battery pack will be consistent, the battery pack will experience cell imbalance. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/42B60L58/22
CPCH02J7/0014H01M10/4207H01M10/425B60L58/22H01M2010/4271H01M2220/20Y02T10/70Y02E60/10
Inventor 欧阳权方如意张茂盛陈善洛王志胜叶永强熊永康
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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