Expansion power supply static and dynamic switching system and method

Abstract

The invention discloses an expansion power supply static and dynamic switching system and method. One end of a switch K1 of the expansion power supply static and dynamic switching system is connectedand fixed to one end of a battery pack B1; the other end of the switch K1 is connected with one end of a power supply joint of a motor controller; one end of a switch K2 is connected with one end of the switch K1; the other end of the switch K2 is connected with the other end of the switch K1 through a precharge resistor R1; the other end of the battery pack B1 is connected with the other end of the power supply joint of the motor controller; one end of a switch K3 is connected with one end of an expanded battery pack B2; the other end of the switch K3 is connected with one end of the power supply joint of the motor controller; one end of a switch K4 is connected with one end of the switch K3 through a precharge resistor R2; the other end of the switch K4 is connected with the other end ofthe switch K3; and the other end of the expanded battery pack B2 is connected with the other end of the power supply joint of the motor controller through a switch K5. According to the expansion power supply static and dynamic switching system and method, the service life of a power battery can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of pure electric vehicle power supplies, in particular to a static and dynamic switching system and method for expanding power supplies. Background technique [0002] Extended Power System The electric vehicle is a cost-effective electric vehicle developed according to the needs of users with different cruising ranges. Compared with traditional electric vehicles, this electric vehicle has the advantages of low vehicle cost, low energy consumption, and flexible use. However, in the development process of electric vehicles with extended power system, the key technology lies in the effective, safe and reliable switching strategy between the fixed battery pack and the extended battery pack. [0003] The extended power switching control system means that when the state of charge (SOC, State of Charge) of a certain battery pack is low during the use of the car, it can quickly switch between the low SOC battery pa...

AI Technical Summary

Problems solved by technology

[0004] 1. Different charging states of the two battery packs will cause a voltage difference, and there is a possibility that the high-voltage battery will charge the low-voltage battery. At this time, the charging current is too large, which will cause damage to the low-voltage battery;

[0005] 2. Since some high-voltage loads of electric vehicles still maintain normal operation, there is a risk of relay adhesion due to arcing caused by excessive operating current during switching, thus affecting the service life of the power battery

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