The protection features available in the 4s 40A Battery Management System are: The schematic of this BMS is designed using KiCAD. The complete explanation of the schematic is done later in the article. The BMS module has a neat layout with markings for connecting the BMS with different points in the battery pack.
Hence no current flows through the BMS. And till the time the battery is not recharged and the voltage of the cell does not cross beyond the V ODR (Over-discharge release voltage), the BMS doesn’t allow the usage of the battery pack, thus increasing the life of our battery pack.
After ensuring all your connections are secure and insulated: Cover the Battery Pack: Place the assembled battery pack inside the appropriate shrink wrap tubing. Heat Application: Use a heat gun or lighter to shrink the tubing around the battery pack. This will help secure the cells together and provide a protective outer layer.
Connecting the BMS: B- Terminal: Connect to the main negative (-) terminal of the battery pack. B+ Terminal: Often already connected internally; check your BMS specifications. B1 (or B0): Connect to the most negative point (first cell's negative terminal). B2, B3, ...: Connect sequentially to the positive terminals of each cell in series.
Over current protection in a BMS is necessary to safeguard the battery systems from overcurrent or short circuit when a short circuit fault occurs or there’s a surge in current from the load which is higher than the battery packs’ specification. This condition can affect the cell’s health or even cause damage to the cell leading to fires.
Find the position of the corresponding welding point of the cable, first mark the position of the corresponding point on the battery. 1. The total negative pole of the battery pack is marked as B0. 2. The connection between the positive pole of the first string of batteries and the negative pole of the second string of batteries is marked as B1. 3.