It works!
But it should be noted that the voltage difference at the lithium iron phosphate charging terminals is large, and the consistency of the homemade battery may not be guaranteed. Are you using 4 channels? For a combined battery pack, it is recommended to check the voltage of each battery at the end of charging (full charge time = approximately 15AH/6A = 2.5 hours). The highest voltage cannot be higher than 3.8V. If it is still charging after exceeding this threshold, turn off the power immediately!
Without a protective plate, charging like this for a long time is a big blow to the battery.
Hello!
1. Judging from the above, the single module is composed of 2 in parallel and 10 in series, with a total length of about 190cm. It is indeed an 18650 battery.
2. The voltage is 3.7 V. This is a ternary nickel-cobalt-manganese lithium-ion battery. The 811 serieswith the highest energy density of 18650 can currently have a maximum capacity of 3 Ah (3000 mAh). this battery is very expensive), reaching the 17ah you mentioned, 6 cells are needed in parallel. If it is an ordinary 2Ah ternary battery, it needs more than 8 cells in parallel.
3. Currently your modules are 2 in parallel and 10 in series, so a 36V17Ah battery requires at least 4 of your modules to be connected in parallel.
4. From the above analysis it appears that the sparks you mentioned when connecting the interfaces should occur when you connect the modules in parallel. The cause of the sparks is a short circuit. When you connect the modules in parallel, the positive and negative poles of the battery module may not be accurately identified. You need to connect all the positive poles together, all the negative poles together, thens use only one wire to power. the exterior.
5. Solution: Before connecting the battery modules in parallel, test the positive and negative polarity at both ends of the module (a multimeter will do) and mark the polarity when connecting in parallel, the connection must be secure to avoid the usage process. It is recommended to use batteries with sufficient charging capacity for the wires, and it is recommended to use more than 6 square meters.