Sop control system and method of lithium titanate battery bms based on hybrid power system

Abstract

The invention discloses an SOP (state of power) control system and method for a lithium titanate battery BMS based on a hybrid power system. The SOP control system comprises a lithium titanate battery pack, a battery pack control module, a temperature control module, an LECU (local electrical control unit) CPU (central processing unit) module, a VCU (vehicle controller unit), a generator and electric motor module, a charging and discharging switch and current control module, a CAN (controller area network) communication module and the like, wherein the LECU CPU module and the VCU are both connected with the CAN communication module; the LECU CPU module is positioned above the VCU; and the battery pack control module and the temperature control module are both connected with the LECU CPU module and the like. By virtue of the SOP control system, the utilization efficiency of the battery can be improved; it is ensured that the vehicle does not lose power caused by undervoltage or overcurrent protection in the running process, even if the SOC (state of charge) of the battery is quite low; and the operation is convenient, and the service life is prolonged.

Description

technical field [0001] The invention relates to a SOP control system and method of a lithium titanate battery BMS, in particular to an SOP control system and method of a lithium titanate battery BMS based on a hybrid power system. Background technique [0002] The three cores of new energy vehicles are batteries, motors and electronic control systems, and the key to them is battery technology. In the past few years, new energy vehicles based on lithium iron phosphate batteries have performed poorly in the market, leading to a crisis of confidence in the application of new energy vehicles. However, with the successful application of lithium titanate batteries, new energy vehicles are regaining the right direction. The biggest advantages of lithium titanate batteries compared with existing lithium iron phosphate batteries and lithium manganese oxide batteries are their long cycle life, excellent rate charge and discharge characteristics, wider operating temperature range and ...

AI Technical Summary

Problems solved by technology

Because there are two sets of power systems, the management and control system has a complex structure, difficult technology, and expensive

[0004] At this stage, there are few state-of-power (SOP) control strategy models for the lithium titanate battery management system (BMS) of the hybrid power system. Generally, it is based on the definition of SOP, that is, the next moment, such as the next 2 seconds, 10 seconds, and 30 seconds. And when there is a continuous high current, the maximum discharge and charge power that the battery can provide is used to limit the power, and there is no specific strategy model to follow, which often leads to the BMS system not being able to provide power when the battery cell voltage is good and the temperature is normal. The power motor drives with a strong current, or when the performance of the battery is not good, such as the voltage drop of the single unit is too fast, and the power battery cannot be well protected

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