Automobile battery thermal management system and working method thereof

Abstract

The invention discloses an automobile battery thermal management system, which comprises a battery pack consisting of battery units, and cooling fluid is filled among the battery units; an inlet and an outlet of the cooling fluid are connected to two pipelines respectively so as to form a big cycle and a small cycle; the big cycle is connected with a main heat exchanger, the small cycle is connected with a refrigeration unit, a position in which the big cycle pipeline is connected with the small cycle pipeline is provided with a valve, and the big cycle pipeline and the small cycle pipeline are provided with a pump for driving the cooling fluid to flow; in addition, the system also comprises a control unit for acquiring signals of a temperature sensor in the battery pack and controlling other components. The invention also discloses a method for the automobile battery thermal management system, which can ensure that the temperature of the cooling fluid in the battery pack is constant within a proper range. The system and the method can make a battery in a proper temperature environment so as to prolong the service life of a battery system, ensure the safety of the battery system and reduce the using cost of the battery system.

Description

technical field [0001] The invention relates to a heat management system for a vehicle battery, and also relates to a working method of the heat management system for a vehicle battery. Background technique [0002] In recent years, due to the pressure of energy costs and the increasing emphasis on environmental protection by the government and consumers, hybrid vehicles and electric vehicles have attracted the attention of many automobile manufacturers due to their advantages of greatly reducing or eliminating exhaust emissions and reducing energy consumption. And have invested heavily in research and development and promotion. However, power battery technology has greatly restricted the promotion of hybrid vehicles and electric vehicles, and has become a bottleneck in the development of new energy vehicles. [0003] As an energy storage device, the power battery plays an extremely critical role in hybrid electric vehicles and electric vehicles, and its performance greatly...

AI Technical Summary

Problems solved by technology

The power battery is composed of multiple battery cells connected in series and parallel. The current power battery cells cannot work normally in extreme low temperature (less than -30°C) and extreme high temperature (greater than 50°C) environments, resulting in the use of power batteries as the The vehicle with the energy source cannot work normally at this time, so that the vehicle cannot meet the requirements of all-weather operation. Compared with traditional vehicles, its use has greater limitations

[0004] In addition, the current power battery is composed of dozens or hundreds of battery cells connected in series and parallel. If the performance of a certain battery decreases due to aging or other reasons, the performance of the entire power battery will drop sharply. If a certain battery If a single unit fails, it may cause the failure of the entire power battery

This brings a lot of trouble to the maintenance of the power battery: if any single battery cell fails, the entire battery pack must be replaced. At the same time, due to the high price of the battery itself, the maintenance cost of the battery remains high.

There are many reasons for the inconsistent performance of battery cells, and one of the important reasons is that the temperature of each battery cell is not balanced, which leads to accelerated aging or failure of battery cells with too high temperature.

[0005] In addition, when the high-power energy exchange between the power battery and other systems (including energy injected into the battery pack or energy output from the battery pack), and when a part of the battery pack’s circuit fails (such as a short circuit), the battery pack may cause performance degradation due to overheating. Serious accidents that deteriorate or even cause the battery pack to explode, causing safety hazards to the operation of the vehicle

[0006] The existence of the above problems has seriously restricted the promotion and use of hybrid vehicles and electric vehicles. Power batteries have become a bottleneck in the development of new energy vehicles. Major car manufacturers and scientific research institutions around the world have also invested a lot of money and manpower in the research of power batteries. work, but judging from the current development of battery technology, it is still very difficult to solve the problem of power battery monomer technology in a short time

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