New energy automobile battery thermal management system

Abstract

The invention provides a new energy automobile battery thermal management system, and belongs to the technical field of automobiles. The new energy automobile battery thermal management system comprises a battery pack. The battery pack is connected with a cooling circuit and a heating circuit. The cooling circuit comprises a heat exchanger, a heat radiator and an electronic circulation pump. The liquid outlet of the battery pack is connected with the heat exchanger through a pipeline. The heat exchanger is connected with the heat radiator through the pipeline. The heat radiator is connected with the electronic circulation pump through the pipeline. The electronic circulation pump is connected with the liquid inlet of the battery pack through the pipeline. The heating circuit comprises an auxiliary heater. The liquid inlet end of the auxiliary heater is connected with the second three-way valve through the pipe line. The liquid outlet end of the auxiliary heater is connected with the first three-way valve through pipeline. The battery pack is enabled to work in the temperature range of 15-35 DEG C all the time so that the service time of the battery pack can be effectively prolonged, the service life and the use safety of the battery pack can be guaranteed and the system is energy-saving and efficient.

Description

technical field [0001] The invention belongs to the technical field of automobiles, and relates to a new energy vehicle battery, in particular to a new energy vehicle battery thermal management system. Background technique [0002] In recent years, the state has vigorously promoted policies such as vehicle exhaust emission reduction and energy conservation, and new energy vehicles have been vigorously developed because they help energy conservation and emission reduction. The battery pack of a new energy vehicle is an energy storage component of a new energy vehicle. When the battery pack is charged and discharged, the working temperature of the battery pack will rise. Excessively high working temperature will reduce its working life and efficiency. At the same time, there are major safety hazards. So far, there have been many spontaneous combustion incidents of new energy vehicle batteries. Therefore, it is very important to ensure that the car battery and other heating po...

AI Technical Summary

Problems solved by technology

[0003] The battery pack of new energy vehicles is composed of multiple battery cells connected in series and parallel. If the performance of some battery cells is degraded due to high temperature, the performance of the entire battery pack will be greatly reduced; if the number of failed battery cells reaches a certain number , it may cause the entire battery pack to fail to meet normal use

Since the battery pack is packaged as a whole, when the number of failed battery units reaches a certain number, it is impossible to maintain and replace the failed battery units. Even if a considerable part of the battery units can still work, the entire battery pack has to be replaced, which will inevitably lead to waste of resources. while increasing costs

One of the most important reasons for battery unit performance failure is the temperature imbalance of each battery unit, which leads to accelerated aging or failure of battery units with too high temperature.

[0004] In addition, the temperature of the battery pack will be too high when charging, and in serious cases, it will cause a short-circuit fault in some circuits of the battery pack. At this time, the excessive temperature or short-circuit fault will easily cause the performance of the battery pack to deteriorate, and even cause the battery pack to fail. Serious accidents such as burning or explosion have buried a major life safety hazard for passengers

[0005] The performance failure or combustion explosion of the battery pack seriously restricts the further promotion and popularization of new energy vehicles. At present, the safety and service life of new energy vehicle batteries have become the bottleneck of the development of new energy vehicles. All manufacturers engaged in the production and research and development of new energy vehicles And researchers have invested a lot of financial and manpower in the research work of battery packs

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