The black frames on either side is to keep the cells orderly and include the contacts for the BMS connections to each cell. |
The batteries are basically jammed into the bottom shell - quite tightly. |
The silver/cream unit on top is the battery management system (BMS), Providing charge and discharge protection function. Taped on to one cell is the thermistor for temperature protection. |
we put the battery pack back into the battery case |
As the screws holding the top on are Torx T-10 with centre pin.We have to use special tool to fit for the screw. |
The pack is well assembled. |
This is the original battery of 14.4V with NiCd packs |
We remove the NiCd pack out of the battery case. You can see it is 12 cells 1.2V to form up a 14.4V packs. |
We use LiFEPO4 22430 to update this tool. Two by two cells in paralle to get three pack with 3.2V2000mAh |
And then 4 packs of 3.2V paralled cells in series to form up a 16V packs |
Finally, we assemble the battery case. |
Power tool manufacturer Dewalt is one of the first commercial users of LiFePO4 battery, having used them in the DC9360 battery for their cordless power tool
With the newest development on LiFePO4 recent years, there is news that a new chemistry battery will come out after experiment called nano-Li4Ti5O12 negative electrodes which can delivering specific power of about 4 to 6 kW/kg.
So the update from NiCd to Li-Fe is not a trend any more. It is a must for powertool market.
