Forklift lithium battery pack parallel topological structure and charging and discharging control method

Abstract

The invention relates to the technical field of forklift lithium batteries, particularly to a forklift lithium battery pack parallel topological structure, which comprises a high-voltage box, a firstbattery box and a second battery box, wherein the high-voltage box is provided with two battery positive interfaces, two battery negative interfaces, two charging positive interfaces, two charging negative interfaces connected in parallel, two charging communication ports, a discharging negative interface, a whole vehicle communication port, two discharging relays connected in parallel, two charging relays connected in parallel, two fuses connected in parallel and a DCDC module. According to the invention, a mode of first parallel connection, then series connection and then parallel connectionis adopted, and the control logic is adopted, so that forklift battery charging and discharging are more balanced, the difference between battery packs is reduced, only one set of management system is needed, the production cost is low, the system control logic is relatively simple, wiring is safe, the unbalanced sparking phenomenon does not exist, use is flexible and convenient, and large-current charging can be achieved; and by adopting the control method, the charging and discharging of the battery are more balanced.

Description

Technical field[0001]The present invention relates to the technical field of forklium cells, and more particularly to a forklium lithium battery pack parallel topologies.Background technique[0002]During the development of industrial vehicles, the battery capacity requires more and more diverse, and the monomer battery capacity is 1 or 2 and cannot meet the operating requirements, so it is necessary to use a parallel structure to increase the battery pack capacity. However, due to the difference in capacity, internal resistance, voltage, etc. between the batteries, the difference between the battery packs during parallel use will gradually increase. At the same time, the traditional battery charge and discharge control is not good, and it is not possible to equal the charge.Inventive content[0003]It is an object of the present invention to solve differences in the prior art due to capacity, internal resistance, and voltages, etc., during parallel use, during which the battery packs w...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the difference in capacity, internal resistance, voltage, etc. between batteries in the prior art, the difference between battery packs will gradually increase during parallel use, and the effect of traditional battery charge and discharge control Not good, can not balance the shortcomings of charge and discharge, and proposed a parallel topology of forklift lithium battery pack and charge and discharge control method

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