An open-circuit fault recombination discharge system of a battery pack and a battery

Abstract

The invention relates to the technical field of power supply, in particular to an open-circuit fault recombination discharge system of a battery pack and a battery, comprising a battery pack and at least two DC / DC modules, wherein one end of each DC / DC module is used for connecting one battery pack and the other end is used for connecting a load bus bar, and the DC / DC module supplies power to theload bus bar in parallel; When battery is discharged, If a single cell is open, the DC / DC module corresponding to the battery pack that is not faulty is turned on. A DC / DC module is connecte in parallel to supply power to that load bus bar, The invention realizes the uninterrupted power supply of the single battery after the open circuit fault of the battery pack, and solves the problem of low voltage stability caused by the existing discharge current channel directly conducting each single battery through the corresponding bypass when solving the open circuit fault of the single battery in the battery pack.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a recombination discharge system for an open-circuit failure of a battery pack and a battery. Background technique [0002] For DC power systems such as electric power and communications, energy storage substations, and electric vehicles, battery packs are all operated in series. The performance of the battery is also constantly changing, which will lead to an increase in the internal resistance of some batteries, a decrease in capacity, or other failures. When the DC system is required to provide power to the load, due to an open circuit failure of one or several single batteries, the The battery will not be able to provide working current, making the entire battery pack useless. In recent years, due to the above-mentioned battery open-circuit fault in the DC power supply system for electric power, the protection and control equipment often refuses to operate, causing la...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a recombination discharge system for battery pack open circuit failure and battery, which is used to solve the problem of voltage caused by the current discharge current channel directly conducting each single battery through the corresponding bypass when solving the open circuit fault of the single battery in the storage battery. low stability issues

[0006] In order to realize the continuous discharge power supply after the open-circuit fault of the single battery when the battery pack is powered, the voltage control during the fault power supply is realized through DC / DC, and the existing discharge current channel is directly passed through the corresponding when the open-circuit fault of the single battery in the battery is solved. The problem of low voltage stability caused by bypass conduction of each single battery, the present invention provides a recombination discharge system for battery pack open circuit failure, including a control module and at least two DC / DC modules, one end of each DC / DC module It is used to connect a battery pack composed of at least one single battery, and the other end of each DC / DC module is used to connect to a load bus, and at least two battery packs in series are connected in parallel to the load bus for power supply; the control module The input terminal is used to detect the fault information of each battery pack. When a fault of the battery pack is detected, the control module controls the DC / DC module corresponding to the battery pack that has not failed to be turned on, and the voltage of each battery pack connected in series The voltage value of the sum supplies power to the load bus

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