Power battery pack active equalization control method based on Markov process

A power battery pack and active equalization technology, which is applied in battery/fuel cell control devices, electric vehicles, vehicle parts, etc., can solve problems such as unsatisfactory results, and achieve the effects of fast equalization response and high equalization efficiency

Active Publication Date: 2021-06-11
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the previous prediction models were based on linear theory to predict the differential pressure value, and the results were often unsatisfactory

Method used

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  • Power battery pack active equalization control method based on Markov process
  • Power battery pack active equalization control method based on Markov process
  • Power battery pack active equalization control method based on Markov process

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Embodiment Construction

[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments.

[0045] Such as figure 1 As shown, the Markov process-based active balancing control method for power battery packs described in this embodiment includes:

[0046] S1: Select TMS320F2812 as the main control module of the active balancing battery management system. The voltage collection of the single battery is completed by the battery monitor chip bq76PL536A-Ql. Balanced module core computing chip;

[0047] S2: Classify and count the historical data of the differential pressure of the battery pack, and calculate the average value of the differenti...

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Abstract

According to a power battery pack active equalization control method based on a Markov process, a Markov chain is utilized to establish a battery pack voltage difference prediction model, and a gray system is introduced to supplement an original model for the condition of abnormal voltage difference change. When it is predicted that the voltage difference is about to jump and expand, a battery management system carries out battery pack equalization by adopting a corresponding equalization control strategy. The application feasibility of the weighted Markov chain prediction model in the aspect of power battery pack differential pressure prediction is verified by using a large amount of historical differential pressure data, and the weighted Markov chain prediction model can reflect the dynamic change trend of a differential pressure value random process; and certain compensation is carried out on the determined value by combining a grey system theory, so that the condition of prediction instability caused by an extreme pressure difference value can be effectively avoided. Therefore, a foundation is laid for effectively realizing the control effect of active balance. Equalization response is faster and more accurate, and the equalization efficiency is higher.

Description

technical field [0001] The invention relates to the technical field of equalization control of power battery consistency in the field of electric vehicles, in particular to an active equalization control method for power battery packs based on the Markov process. Background technique [0002] The prediction based on the voltage difference in the battery pack is of great significance to the design and development of the battery management system. The excessive pressure difference of the power battery will bring safety hazards to the use and maintenance of electric vehicles and damage the battery pack. In order to protect the battery and prolong the service life of the battery, it is necessary to carry out balanced control in the use of the power battery. Whether the power battery pack starts to balance is mainly judged by the battery open circuit voltage or SOC, but the open circuit voltage of the battery can only replace the battery electromotive force after a long period o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L58/22
CPCB60L58/22Y02T10/70
Inventor 单毅胡攀攀朱立中
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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