Printed circuit boards (PCBs) are the carrier of new energy vehicle power management......
Printed circuit boards (PCBs) are the carrier of new energy vehicle power management systems (BMS). Due to high current requirements and mold size limitations, PCB heat dissipation faces serious challenges. The heat generated by high current causes a sharp increase in the internal temperature of the system. If the heat dissipation is not timely and exceeds the rated temperature of the components, the insulation and reliability of the components will be reduced, and the service life will be shortened.So for BMS design, PCB heat dissipation design is very necessary. The main heat dissipation material used in PCB design is the heat sink. The larger the heat dissipation area of the heat sink, the better. There are many ways to connect the PCB to the heat sink, including thermal conductive silicone grease, thermal conductive silicone pad as the heat transfer medium (thermal conductivity needs to be considered), MOS directly locked on the heat sink, etc. - the more direct the effect, the better. Due to the sealing environment of the vast majority of PCBs and limited heat dissipation performance, for some metal casing boxes, heat can be directly directed to the box.
The battery cell module in the Weima battery pack adopts a full series mode. In the event of a single battery cell failure, the entire module circuit is cut off to prevent any impact on other normal battery cells, just like a fuse in a household circuit. When the power is too high, it protects the appliance from being burned out. In addition, the independent liquid cooling circuit is located at the bottom of the cell module, ensuring better adhesion and maintaining the battery in the optimal temperature range by covering the aluminum water-cooled plate with thermal conductivity gaskets. Each cell module in the battery pack also has two temperature sensors built-in, which accurately manage all cells through BMS and BTMS, controlling the temperature difference between cells to ± 2 ° C, effectively improving battery life.
