mhoekstra
New member
- Joined
- Dec 24, 2018
- Messages
- 3
Hi!
This is my first post on this forum.
I'm open for constructive feedback regarding the way I post this (if necessary) ?
I'm looking for a way to monitor the temperature of a battery pack or the temperature of (a few) single cells.
I'm not a big fan of a standard (and often cheap) BMS but also avoiding a really expensive (but professional) BMS for now.
My first idea is to put 1 thermistor (thermal resistor) between every 4 cells in the pack. A pack with for example 40 cells would have 10 thermistors. The leads to these thermistors should go to 1 monitoring device that would simply cut of all power to and from the whole pack (with a relay), when 1 of thermistors reads a temperature that is to high. Or it could sound an alarm.
A temperature monitor on AliExpress is very cheap, but of course most of the time it only has one sensor/thermistor with relay. Is there a chance your could wire multiple thermistors to this one temperature sensor, so the the relay will engage when 1 of the thermistors reads a high temperature?
My second idea is 1 dedicated thermistor to each cell. Since a thermistor can limit current when it's getting hot, it could limit (or totally cut off) the current going to the cell, when it's connected between the charger and the battery. Thus possibly preventing it from getting worse. It sounds like a very cheap and reliable option to protect cell from overheating, whiteout a central monitoring device.
Is this a very stupid idea, is this a good idea and are there more things to take into account or is it a good idea but am I missing something why it wouldn't work in practice?
Marc
This is my first post on this forum.
I'm open for constructive feedback regarding the way I post this (if necessary) ?
I'm looking for a way to monitor the temperature of a battery pack or the temperature of (a few) single cells.
I'm not a big fan of a standard (and often cheap) BMS but also avoiding a really expensive (but professional) BMS for now.
My first idea is to put 1 thermistor (thermal resistor) between every 4 cells in the pack. A pack with for example 40 cells would have 10 thermistors. The leads to these thermistors should go to 1 monitoring device that would simply cut of all power to and from the whole pack (with a relay), when 1 of thermistors reads a temperature that is to high. Or it could sound an alarm.
A temperature monitor on AliExpress is very cheap, but of course most of the time it only has one sensor/thermistor with relay. Is there a chance your could wire multiple thermistors to this one temperature sensor, so the the relay will engage when 1 of the thermistors reads a high temperature?
My second idea is 1 dedicated thermistor to each cell. Since a thermistor can limit current when it's getting hot, it could limit (or totally cut off) the current going to the cell, when it's connected between the charger and the battery. Thus possibly preventing it from getting worse. It sounds like a very cheap and reliable option to protect cell from overheating, whiteout a central monitoring device.
Is this a very stupid idea, is this a good idea and are there more things to take into account or is it a good idea but am I missing something why it wouldn't work in practice?
Marc