Charging-discharging control circuit of vehicular power battery pack

Abstract

The invention discloses a charging-discharging control circuit of a vehicular power battery pack, which at least comprises a flexible connection battery pack module 1, a data acquisition module 2 and a control module 3, wherein the flexible connection battery pack module 1 at least comprises a battery unit and a flexible connection unit. The charging-discharging control circuit disclosed by the invention realizes switching of single battery connection modes of the vehicular power battery pack under the charging and discharging conditions; when the vehicular power battery pack is charged, all single batteries are charged in a series connection mode, therefore low-current fast charging under high voltage is realized easily, and the charging speed is improved; when the vehicular power battery group is in a discharging state, the single batteries are connected in parallel and then connected in series, and thus the fault rate of the whole battery pack system is reduced; and the control circuit disclosed by the invention can ensure that the consistency of the single batteries in the battery unit is kept well, the optimal property of each single battery is expressed, the battery volume is fully utilized, the life of the battery pack is prolonged, and favorable practical application value is achieved.

Description

technical field [0001] The invention relates to the field of electric vehicles and the field of battery management systems, in particular to a charging and discharging control circuit for a vehicle power battery pack. Background technique [0002] At present, energy shortage and environmental pollution are important reasons restricting the sustainable development of human beings. They are two major challenges to the development of the world's automobile industry. In the process of research and development of electric vehicles, power batteries and their management systems are used as power sources and auxiliary power sources. Components are the most important part. In order to ensure the good performance of the battery and prolong the service life of the power battery, a special management system must be set up to detect its working status and manage and control it reasonably and effectively, so as to cooperate with the normal control system to realize the complete vehicle. S...

AI Technical Summary

Problems solved by technology

If the battery pack is discharged by connecting all battery cells in series, the reliability of the entire battery pack system is not high, the service life of the battery pack is not long, and the failure of the battery cell will directly affect the normal operation of the entire power system, which may cause As a result, the failure rate of the power supply system increases rapidly; if the battery pack is discharged in a full parallel connection of battery cells, the voltage value required by the external motor and other equipment will not be reached. When this connection method is used for fast charging, the internal cables of the battery pack It needs to withstand a considerable current, and it is also not conducive to the development of charging equipment; if the battery pack is charged in a series-parallel hybrid connection of battery cells, it is difficult to achieve fast charging of the battery pack with high voltage and low current

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