Battery unit parallel system, device and battery unit parallel method

Abstract

The invention discloses a battery unit parallel system, a device and a battery unit parallel method. The battery unit parallel system comprises multiple battery units, multiple battery management modules corresponding to multiple battery units in a one-to-one manner, a first control switch, an upper computer and a power supply, wherein the power supply and a battery unit subcircuit can supply power for the battery management modules of the battery units; when the power supply is in power down, the battery management modules can supply power through the battery units, and a phenomenon that the power supply is in power down, and the battery management modules can not normally operate does not exist; when the multiple battery units are parallel, the battery management modules are utilized to detect one battery unit with the upmost voltage, the battery unit with the upmost voltage can charge for the battery unit with the lower voltage, until the voltages of the battery units are equal, and the process is free from influence whether the power supply is in power down; and the voltage difference between the voltage and the battery unit with smallest voltage is reduced when the battery units are parallel, and therefore, the required lime of the battery units which are parallel is less than the required lime of the existing battery units which are parallel.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a battery pack parallel connection system, a device and a battery pack parallel connection method. Background technique [0002] In high-power application scenarios, the current provided by a single battery pack usually cannot meet the usage requirements. At this time, multiple battery packs need to be connected in parallel to increase the supply current. When connecting battery packs in parallel, each battery pack must have the same voltage. The output voltage of the last battery pack is equal to the voltage of one battery pack. [0003] Due to the inconsistency of the battery cells in the battery pack, the voltage of each battery pack is different. Therefore, after the first power-on process of each battery pack, the voltage of each battery pack must be the same before connecting each battery pack in parallel. The voltages of the three battery packs are 40V, 38V, and 42V r...

AI Technical Summary

Problems solved by technology

[0004] Due to the low charging current required in the battery pack, that is, it takes a long time for the battery pack to be charged to the predetermined value, if the mains power is unstable in the application scenario, the mains power may be frequently cut off, causing each battery pack to go through several times for the first time. Only during the power-on process can they be connected in parallel for overall charge and discharge, which leads to a complicated process of parallel connection of battery packs, and the time required for parallel connection of battery packs is relatively long

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