Active equalization method and active equalization system for series-connected batteries
A battery pack, active balancing technology, applied in charge balancing circuits, arrangement of multiple synchronous batteries, electric vehicles, etc., can solve the problems of slow heat dissipation, low efficiency, unbalanced batteries, etc., to extend service life and improve consistency , easy to modularize effects
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Embodiment 1
[0031] Such as figure 1 As shown, the implementation steps of the active equalization method for series battery packs in this embodiment include:
[0032] 1) Collect the voltage of each single battery in the current series battery pack;
[0033] 2) Sort the voltages of all the single cells in the current series battery pack to get the maximum voltage value U max and the minimum voltage value U min ;
[0034] 3) Judging the maximum voltage value U max and the minimum voltage value U min Whether the difference is greater than or equal to the preset equalization threshold D is established, if it is established, skip to step 4); otherwise, skip to step 1);
[0035] 4) Determine the boundary value of the voltage interval for grouping the cells of the current series-connected battery pack based on the specified number of groups;
[0036] 5) According to the boundary value of the voltage interval, the individual cells in the battery pack are grouped according to the voltage of ...
Embodiment 2
[0062] This embodiment is basically the same as Embodiment 1, and the main difference is that the active equalization method for series-connected battery packs in this embodiment is aimed at the active equalization of multiple series-connected battery packs (multiple series-connected battery packs).
[0063] The following will be Figure 5 The shown multi-series battery pack) is taken as an example, and the active equalization method for series-connected battery packs in this embodiment is further described in detail for the active balancing of multiple series-connected battery packs (multi-series battery packs).
[0064] Such as Figure 5 As shown, in this embodiment, each series-connected battery pack is composed of 7 strings of single cells, corresponding to an active equalization module, and energy is transferred between each series-connected battery pack through a 12V auxiliary battery. This structure can easily achieve active balancing for all battery cells in the entir...
Embodiment 3
[0066] This embodiment is basically the same as Embodiment 2. The main difference is that a battery pack in series in this embodiment consists of two 7-series single cells (U1~U14), and two active equalization modules are used correspondingly (active equalization module# 1 and active balancing module #2) to manage the active balancing of two 7-string single cells, the active balancing module #1 manages the balancing of U1~U7, and the active balancing module #2 manages the balancing of U8~U14. see Figure 6 , in this embodiment, in order to better express the grouping, the voltage M of U1~U14 is set to 1~14 in random order, for example, the voltage M of U6 is 14, the voltage M of U13 is 1, and the fixed number of groups is set to 5. T in the figure is (U6-U13) / 5. Assuming that the battery voltage distribution is as follows Figure 5 shown in . Group 1 and Group 5 after grouping (G MAX The number of single cells in the group) is the same, the battery cells to be balanced in ...
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