Electric vehicle battery monitoring and management system and monitoring method of batteries

Abstract

The invention relates to the technical field of electric vehicle safe operation, in particular to an electric vehicle battery monitoring and management system. The electric vehicle battery monitoring and management system comprises a vehicle control system body and at least one battery box. Each battery box is internally provided with multiple sets of batteries. The electric vehicle battery monitoring and management system is characterized in that each battery box is internally further provided with a battery detection unit and an action executing device; each battery detection unit comprises a data acquisition module, a CPU core processing module, a communication transmission module and an executing device control module; and each data acquisition module comprises an acquisition device for acquiring the battery module temperature, the battery voltage and current and battery module environment parameters. The invention further discloses a monitoring method of the batteries. The monitoring method of the batteries comprises the steps that the temperature, the voltage and the current of the module as well as the temperature, smoke, gas, flame and other parameters in the battery boxes are monitored; and an early warning or fire fighting signal is sent out when the performance of the batteries is suddenly changed or thermal runaway occurs. According to the electric vehicle battery monitoring and management system and the monitoring method of the batteries, the development stage of thermal runaway can be accurately judged by comprehensively analyzing and processing the various parameters inside and outside battery modules, so that the thermal runaway detection accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of safe operation of electric vehicles, in particular to a battery monitoring and management system for electric vehicles. Background technique [0002] Electric vehicles are being promoted as an environmentally friendly vehicle, and the reliability and safety of battery packs as a new energy source for electric vehicles is related to the success or failure of the development of electric vehicles. The safety of batteries is related to personal and property safety, especially at present, electric vehicles are the main carrier of batteries. Once the batteries catch fire or explode, it is easy to cause casualties. Due to the small capacity of lithium batteries, a lithium battery electric vehicle will use hundreds or even thousands of lithium batteries. In addition, lithium ions are relatively active, and thermal runaway may occur even in a static storage state, so it is very safe in terms of safety. difficult ...

AI Technical Summary

Problems solved by technology

The disadvantage is that even if only one single battery thermal runaway occurs, the temperature sensor must be arranged at the battery position of all the single batteries to detect it at the first time, otherwise, if the temperature sensor is only arranged on one or a few electrodes , thermal runaway of a cell that is not close to the temperature sensor can only be detected if there is sufficient heat dissipated to reach the temperature sensor

At this time, even if the detection confirms that thermal runaway has occurred, it has formed an irreversible safety threat, because under such heat, the single battery adjacent to the thermal runaway battery has reached or exceeded the external environment that caused it to cause thermal runaway. Temperature conditions, thermal runaway chain reaction has formed, it is very likely to cause extremely rapid fire

Existing known systems solve these problems by deploying as many temperature sensors as possible, however this results in an extremely expensive system, more complex installation, and due to an extremely cumbersome wiring harness, this in turn reduces the reliability and safety of the battery pack

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