After ten years of rapid development, electric vehicles, a consumer product, are indispensable to the common people just like firewood, rice, oil and salt. According to relevant statistics, as of the end of 2013, the number of electric vehicles in the national market has reached 150 million.

Some controllers on the market only have the function of under-voltage protection, that is, when the battery voltage is lower than a certain voltage value (such as 32V), the controller is blocked from working, which makes it easy for users to use the battery's rising voltage to work (that is, after the battery stops discharging , The battery voltage will rise by 2～3v), causing the battery to over discharge.

There are two types of electric vehicle controllers in terms of structure. We call them separate and integral types.