Electric automobile power battery equalization management system and method
A battery management system and balanced management technology, applied in electric vehicles, battery circuit devices, secondary battery charging/discharging, etc., can solve the problems of not being able to fully and effectively reflect the battery balancing situation, ignoring, reducing balancing speed and balancing efficiency, etc.
Active Publication Date: 2014-04-16
GUILIN UNIV OF ELECTRONIC TECH
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Although this patent reduces the complexity of the equalization method to a certain extent, it is mainly implemented with passive equalization circuits, which reduces the equalization speed and equalization efficiency, and uses a single variable—the remaining battery
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[0094] The embodiment of the electric vehicle power battery balance management system will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods
[0095] The overall structure of this embodiment of the electric vehicle power battery balance management system is as follows: figure 1 As shown, including a microcontroller, the battery balancing management system in this example is connected to the battery management system, and the battery management system is equipped with a detection circuit for obtaining the current operating parameters of the power battery pack. In this example, there are 12 single cells in the electric vehicle power battery pack, which are divided into 3 identical battery modules according to the sequence of series connection, and each battery module contains 4 single cells, namely B11~B14, B21~B24, B31 ~B34, B41~B44. Each battery module is respectively connected to a corresponding resistance ...
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The invention provides an electric automobile power battery equalization management system and method. Battery cells of a battery pack of the electric automobile power battery equalization management system are connected in series and sequentially divided into M identical battery modules. All the battery modules are connected with corresponding resistor equalization circuits and capacitor equalization circuits as well as a coaxial multi-winding DC-DC converter. A microcontroller is connected with a battery management system so as to acquire battery pack status data. Signals of the microcontroller are connected with all the resistor equalization circuits and the capacitor equalization circuits and further connected with a pulse drive unit and a converter. According to the equalization management method, the microcontroller first acquires nominal parameters of the battery pack, so that control parameters are determined; then, the microcontroller acquires current operation variables, so that the maximum deviation and the dispersion degree of voltage of the battery modules are calculated; according to different states of the battery pack, namely charging, quiescence and discharging, different judgment standards for starting equalization are selected, the converter is used for equalization between the modules, the resistor equalization circuits and the capacitor equalization circuits are used for equalization between the battery cells. According to the electric automobile power battery equalization management system and method, advantages of various equalization circuits are complementary to one another, so that equalization speed is increased, and equalization efficiency is improved.
Description
technical field [0001] The invention relates to the technical field of power control of new energy vehicles, in particular to an electric vehicle power battery balance management system and a balance management method. Background technique [0002] At present, new energy vehicles are the focus of automobile development research, and electric vehicles are more important. The power battery pack is a key component that restricts the industrialization process of electric vehicles. There is a "barrel effect" in the power battery pack, that is, the battery pack and its performance are determined by the worst battery among them. Therefore, the consistency of the batteries in the battery pack is one of the key indicators for judging the performance of the battery pack. Research on battery balance management system has become a necessary means to solve the inconsistency of batteries in the battery pack. However, the domestic and foreign battery balance management technology mainly ...
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Login to view more IPC IPC(8): H02J7/00H01M10/44
CPCY02E60/10
Inventor 张向文崔继友许勇党选举伍锡如莫太平潘明任风华
Owner GUILIN UNIV OF ELECTRONIC TECH
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