Charging and discharging compound type automatic equalizing circuit for serially-connected battery pack and equalizing method

Abstract

The invention discloses a charging and discharging compound type automatic equalizing circuit for a serially-connected battery pack and an equalizing method. The charging and discharging compound type automatic equalizing circuit comprises n battery unit compound type equalizing modules which are set according to the number of battery units in the serially-connected battery pack, and a battery pack equalizing module which consists of a main control module and a high-voltage direct-current / direct-current (DCDC) module, wherein n is more than or equal to 1; the battery unit compound type equalizing modules correspond to a battery pack which consists of k serially connected battery units, wherein k is more than 1; and each battery unit compound type equalizing module consists of a switch matrix, a local control module, a low-voltage DCDC module, k discharging equalizing circuits and a mode control switch. The charging and discharging compound type automatic equalizing circuit for the serially-connected battery pack has the advantages of high reliability, low cost, small volume and light weight, has multiple functions, is easy for large-scale and industrial manufacturing and application, and can be used in the fields of electric automobiles, rail traffics, wind power generation and the like, which require serially-connected battery packs and capacitor sets.

Description

technical field [0001] The invention relates to the technical field of series battery packs, in particular to a charging and discharging composite automatic equalization circuit and equalization method for series battery packs. Background technique [0002] Energy storage devices such as batteries and supercapacitors are widely used in various fields. In particular, in recent years, in electric vehicles, power batteries such as lithium-ion batteries, supercapacitor systems, etc. have been regarded as one of the key components. For these batteries and capacitors working in series, how to ensure fast and efficient automatic equalization of each battery unit and capacitor unit is the key to ensuring its safety and reliability, prolonging its service life, reducing its use cost and giving full play to its performance. a key technology. [0003] At present, for the automatic equalization of series batteries and capacitor banks, the automatic equalization method of discharging t...

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Problems solved by technology

[0005] Aiming at the above-mentioned defects in the prior art, the present invention provides a charge-discharge composite automatic equalization circuit and equalization method for series battery packs, which can overcome the long equalization time, low equalization efficiency, overly complicated equalization system and the equalization method in the prior art. The defect of high cost realizes the online automatic, fast and efficient equalization of batteries and capacitor banks, and it has high reliability, low cost, small size, light weight, comprehensive functions, easy scale, industrial manufacturing and application

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