Active safety protection system for power battery pack of electric automobile

Abstract

The invention discloses an active safety protection system for a power battery pack of an electric automobile. All cells are connected in series to form a cell set, a positive electrode of the cell set is connected with a total positive output end through a positive electrode outgoing wire, a normally-closed relay and a fuse, the normally-closed relay and the fuse are arranged on the positive electrode outgoing wire, and a negative electrode of the cell set is connected with a total negative output end through a negative electrode outgoing wire. The control end of the high-voltage normally-closed relay is connected with a battery management slave control unit, a shunt is arranged on the negative electrode outgoing wire, and the shunt is used for acquiring currents output by the cell set and outputting the currents to the battery management slave control unit. According to the protection system, output of the power battery pack can be intelligently switched off in unforeseen circumstances, the situation that personal safety is endangered due to high voltage is avoided, and especially the problem about safety of the power battery pack when the vehicle suffers from wading, collisions and other accidents can be effectively solved. By means of the system, through multiple safety protection functions, it is fully guaranteed that power batteries can be safe and reliable whether running in vehicle loading or under the offline centralized charging condition, and major safety accidents are completely eradicated.

Description

technical field [0001] The invention relates to electric vehicles, in particular to an active safety protection system for a power battery pack used in electric vehicles, and belongs to the technical field of electric vehicles. Background technique [0002] As the world's energy situation continues to be severe, new energy vehicles that do not use traditional fuels are increasingly being advocated and encouraged by everyone. Among them, electric vehicles have become the key direction of enterprise research and development, and with the development of technology, they have also realized commercial applications and gradually entered people's lives. Although electric vehicles have already been driven on the road, they still face many problems, which is also an important reason for their slow development. The most important limiting factor is the power battery. At present, the power battery mainly has the following defects: 1. The cost remains high, accounting for more than hal...

AI Technical Summary

Problems solved by technology

Although electric vehicles have already been driven on the road, they still face many problems, which is also an important reason for their slow development. The most important constraint is the power battery.

At present, the power battery mainly has the following defects: 1. The cost remains high, accounting for more than half of the vehicle cost; 2. The battery life is weak. , the cruising range will continue to decrease; 3. It is inconvenient to charge the battery, which is far less than the current layout density of gas stations, and there are certain requirements for the charging environment temperature, otherwise it will affect the battery life; 4. The life is short, and the life of the power battery Usually 5-6 years, after scrapping, you need to buy a new power battery, which is expensive and unaffordable for consumers; 5. The charging time is long, even if it is fast charging, it takes more than half an hour. It is still very difficult to refuel with traditional gas stations 6. The battery specifications of different car companies and models are different, and they are often not interchangeable, which puts forward higher requirements for battery manufacturers and vehicle manufacturers, and also improves the overall battery life. Car development costs; the battery configuration of the same car is the same, and consumers cannot make personalized adjustments according to their actual driving conditions

7. In order to monitor the working condition of the battery, the existing electric vehicle is equipped with a BMS management system for the power battery. The BMS management system is used to monitor important information such as the voltage, current and temperature of the battery. This information is stored in the BMS management system. Only special equipment can be read, the user is not equipped with such equipment so it is impossible to understand

However, due to the characteristics of the power battery itself, its output is still high voltage, so it can be used as a voltage source to connect with other devices on the vehicle, and to protect itself in case of accidents. Compared with traditional fuel engines, electric vehicles The requirements are higher. Once leakage and insufficient insulation occur, it will pose a serious threat to the safety of the people on board and the vehicle.

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