2.4.5 Temperature Sensor
The temperature sensor serves one purpose, and that’s to prolong the life of your battery cells when the
temperature is too high or too low. Recall that lithium batteries do not work well at temperature extremes.
This BMS is capable of protecting the battery cells in four different scenarios (each have their own trigger and
release temperatures, and delay times):
1. At extremely low temperatures, prevent charging
2. At extremely low temperatures, prevent discharging
3. At extremely high temperatures, prevent charging
4. At extremely high temperatures, prevent discharging
The thing to stress here is that the BMS must react to the cell temperature, not the temperature of the ambient
air. So the temperature sensor must be taped to the cells.
Here are some guidelines to follow:
● Tape the temperature sensor to the battery cell case.
● Do not tape the sensor to the plastic bits that may be on the top side of the battery.
● Placing the sensor between cells in the middle of the pack is better than placing it at the top or bottom
of the pack.
● Use Kapton tape if you have it, or can get it. Otherwise, any tape will do, (just make sure that it stays
adhered to the battery over the weeks, months, and years to come).
At this point, plug in the temperature sensor, if it was previously disconnected. Tape the sensor to the
battery, using the precautions listed above.
2.4.6 External Switch
An optional external switch can be wired to the BMS via the included 2-pin pigtail (JST-XH, red/black wires).
If the configuration option is enabled within the BMS, discharging will be disabled when the switch contact is
open. When the switch is closed (or a jumper is in the place of the 2-pin connector), the BMS will operate
normally.
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