Introduction of lithium battery pack for electric vehicles
Electric vehicle batteries(this article focuses on two wheeler batteries) are the source of power on electric vehicles. The battery drives the motor through the controller, converts electrical energy into mechanical energy, and drives the motor to rotate, so that the electric vehicle runs.
The battery, controller, and motor form an electric vehicle power system. In the system, the battery provides power, the motor rotates, and the controller controls and protects the battery and the motor to achieve controllable and safe work between the battery and the motor. The controller is the core control component.
The controller’s control of the battery includes two parts, one is current limiting, and the other is undervoltage protection. The current limit value must be less than the overcurrent protection value of the PCM, otherwise the PCM will be protected in advance, resulting in a malfunction and affecting the use. The undervoltage protection value of the controller is higher than the overdischarge protection of the PCM, otherwise it will cause abnormal power failure, shorten the riding distance, and cause customer complaints.
Because the motor is an inductive load, the starting current of the electric vehicle is greater than the normal working current, which is generally twice the working current, and the overload current of the controller is also twice the rated current. The standard requirement for withstand overload time is 3min. The maximum operating current of the battery PCM is required to be greater than twice the current limit of the controller
Address: Building B, Juji Science and Technology Park, YaBianXueziwei, Shajing Street, Baoan District, Shenzhen, Guangdong, CN