The core function of electronic control is the battery management system (Battery management system) for short BMS. Without this system, the charging and discharging and service life of the power battery will be greatly reduced. If the battery is compared to a team of soldiers participating in the battle, then the BMS system is the staff and general of this group of soldiers, allowing electric vehicles to achieve twice the result with half the effort in practical applications. Effect.

　　Three electric technologies on electric vehicles: batteries, motors, and electronic control technology are the core technologies of electric vehicles. Because of the use of these three technologies, every electric vehicle needs and directly affects the vehicle's cruising range, acceleration time and other parameters. These three technologies are the wooden barrels that make up the electric vehicle, and any shortcoming in any one of them will directly affect the performance of the vehicle.

　　The impact of batteries and motors on the performance of electric vehicles in Sanden technology is more obvious. For example, the power of the motor directly affects the power performance of the vehicle, and the energy storage of the battery of a pure electric vehicle is closely related to the cruising range of the vehicle. But what is the specific technical application of the same electronic control technology in the three-electric system in electric vehicles? Why can it occupy a place in the three-electric system together with batteries and motors?

　　The core function of electronic control is the battery management system (Batterymanagementsystem) for short BMS. Without this system, the charging and discharging and service life of the power battery will be greatly reduced. If the battery is compared to a team of soldiers participating in the battle, then the BMS system is the staff and general of this group of soldiers, allowing electric vehicles to achieve twice the result with half the effort in practical applications. Effect.

　　Why is there a BMS system?

　　If you want to understand the "general" on electric vehicles thoroughly, you must first start with the soldiers below. The BMS system is mainly applied to secondary batteries, especially for the current mainstream electric new energy vehicles using lithium-ion batteries. Regardless of the type of lithium-ion battery used in the vehicle, the power battery is composed of small battery cells in series and parallel to form a battery pack, and then the battery pack finally forms the power battery unit of the vehicle.

　　And what really plays the role of energy storage in the battery pack is each small battery cell in the battery pack, such as the 18650 lithium ion battery used by Tesla. In fact, the number represents that each battery cell has a diameter of 18mm and a length. It is 65mm. The battery pack of an 85kW?h version of TeslaModelS consists of nearly 7000 18650 lithium batteries.

　　There are so many battery cells in a car, and each small battery cell is manufactured separately. Because of the electrochemical characteristics of the battery, the battery after leaving the factory has a difference in the consistency of the energy storage of each cell. problem. When charging, the car is charged from a charging port. How to ensure that each battery is fully charged without causing damage to the battery due to overcharging is one of the problems that the BMS system must solve.