Nicd Battery Pack Thermistor

I m laying out a pcb for a nimh single aa cell charger following the avr450 application note battery charger for sla nicd nimh and li ion batteries but i m not sure where to place the ntc thermistor that will read the cell temperature throughout the charging process.

Nicd battery pack thermistor. Excessive loading of the battery packs can create a dangerous overheating situation. Organized by voltage we offer packs from toy grade to competition grade and everything in between. Hopefully someone here can shed some light no pun intended on the subject. I plan to lay out the cell holder like in the picture below.

You should always measure your battery pack before plugging in your tool. Careful management of temperature during charging prolongs battery life and avoids hazards inherent to li ion batteries. Accurate temperature sensing is essential for safety reasons in any industry and any battery application. This method does not require an end of charge sensor and ensures a full charge.

All 6 of my milwaukee 18v nicd battery packs are dead. Ntc thermistor temperature sensors are a key component in li ion battery charging and safety. 231 798 7033 fax 231 798 7044 ww hardingenergy com. I refuse to pay 80 for new ones so i rebuilt two of them with new 1 2v sub c nicd cells same ones used in the original pack.

One energy centre norton shores mi 49441 ph. Does anyone have a better way of building them other than soder each battery. Whether you re powering your rc car or building a battlebot we have a pack that suits your needs. It was above the nominal 9 6v of the pack.

This particular battery pack has a nominal voltage of 9 6v 8 cells in series 1 2v each. I verified the voltage on the battery pack and it was fine. They provide critical temperature data required to keep the li ion battery in the optimum condition during the charging cycle. I found a battery spot welder but it is like 5 000 bucks.

The cheapest way to charge a nickel cadmium battery is to charge at c 10 10 of the rated capacity per hour for 16 hours. So a 100 mah battery would be charged at 10 ma for 16 hours. Nicd and nimh pack design harding battery handbook for quest rechargeable cells and battery packs section 7 1 contact harding for listing of current items in stock harding energy inc. The thermistor chip on fr4 sensor has been a solution for harsh environments with the possibility for battery fault conditions.