A control method for maximizing capacity utilization of reconfigurable battery packs
A control method and technology of battery packs, applied in the field of batteries, can solve the problems of limited equalization effect of parallel-series configuration battery packs, etc.
Active Publication Date: 2022-03-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
For example, CN111354989A only proposes the reconfigurable control idea without introducing specific implementation methods, and CN110299745A only considers the balance of the series connection and ignores the balance of the parallel connection, and the balance effect in the widely used parallel-series configuration battery pack may be limited
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[0036] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0037] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.
[0038] Such as figure 1 As shown, firstly, the maximum available capacity test and HPPC mixed pulse test are carried out on all the cells in the battery pack to obtain the parameters such as the capacity and in...
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The invention discloses a reconfigurable battery pack capacity utilization maximization control method. Firstly, the maximum available capacity test and the HPPC mixed pulse test are carried out on all cells of the battery pack to obtain cell parameter information; the large-capacity module is first disassembled After the combination, the small-capacity module first bypasses and then returns to balance each module, and at the same time ensure the stability of the battery pack terminal voltage; use the PWM time-sharing method to balance each unit in the module, and stagger the connection of each unit The pass time ensures that the module is always online; eventually all the cells in the battery pack reach the same equilibrium state, and the capacity of the battery pack is utilized to the greatest extent. This method comprehensively considers the balance between the modules in the battery pack and the balance of the cells in the module. With the help of the characteristics of the free switching of the connection form of the cells in the reconfigurable battery, the balance of all the cells in the battery pack is realized and the battery pack is maximized. available capacity.
Description
technical field [0001] The invention relates to the technical field of batteries, in particular to a control method for maximizing capacity utilization of reconfigurable battery packs. Background technique [0002] Lithium-ion batteries are currently the most commonly used battery type in electric vehicles, with the advantages of high specific energy, high specific power, long cycle life, and no memory effect. In order to meet the high-power and high-voltage operation requirements of electric vehicles, lithium-ion battery cells are usually connected in series and parallel to form a lithium-ion battery pack. However, due to manufacturing differences, differences in the environment of the cells, and temperature differences between the cells, the capacities of the cells in the battery pack are often not equal. This difference in capacity between cells makes the actual available capacity of the battery pack limited by the smallest capacity cell. When the minimum capacity cell ...
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IPC IPC(8): H02J7/00H01M10/42H01M10/44
CPCH02J7/0024H02J7/0016H02J7/0048H02J7/007182H01M10/4207H01M10/425H01M10/441H01M2010/4271Y02E60/10
Inventor 魏中宝崔皓勇何洪文张盛
Owner BEIJING INSTITUTE OF TECHNOLOGYGY