| CPC H02J 7/0024 (2013.01) [H02J 7/00032 (2020.01); H02J 7/0019 (2013.01); H02J 7/0063 (2013.01); H02J 7/007182 (2020.01)] | 10 Claims |
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1. A parallelization method of a battery system, wherein the battery system comprises a plurality of battery pack modules, each of the battery pack modules comprises a battery pack and a switching circuit corresponding to the battery pack, the switching circuit is configured to be connected in series between a charging power supply and the battery pack, and the parallelization method comprises:
acquiring voltages of the battery packs respectively;
setting a charging priority of each of the battery packs according to a preset rule and the voltages of the battery packs; wherein the preset rule is voltage differences between the battery packs in a same charging priority being less than a preset value and the voltage of the battery pack in a low charging priority being higher than that of the battery pack in a high charging priority; and
controlling the switching circuit corresponding to the battery pack in the highest charging priority to be turned on to connect a charging loop of the battery pack for charging, and if the voltage of the battery pack currently charged is increased to a value close to the voltage of the battery pack in a next charging priority, controlling the switching circuit corresponding to the battery pack in the next charging priority to be turned on, so that the battery pack in the next charging priority is connected in parallel to the charging loop for being charged until all the battery packs are connected in parallel to the charging loop for being charged;
wherein setting a charging priority of each of the battery packs according to a preset rule and the voltages of the battery packs comprises:
S310, sorting the battery packs in descending order of their respective voltages;
S320, taking the lowest voltage of the battery pack for which no charging priority has been set as a first target voltage;
S330, obtaining a second target voltage according to the first target voltage and the preset value, and obtaining a target voltage range according to the first target voltage and the second target voltage;
S340, setting the charging priority of the battery pack whose voltage is in the target voltage range to a first charging priority, and updating the first charging priority, wherein the first charging priority after being update is lower than the first charge priority before being update; and
repeating S320 to S340, until charging priorities are set for all the battery packs.
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