can anyone suggest where i can find a bms for a 7s9p pack consisting of these samsung cells INR21700-50E
if I understand correctly, that's 9.8A max discharge (continuous) per cell which means in my 9p configuration a bms that can handle a maximum discharge current of 88A continuous and 132A non-continuous.
voltage due to 7s will be 24v (25,2 nominal)
the 24v 7s bms I can find are generally all much lower amp rated than my 88A/132A figures above
could anyone point me towards a suitable bms please?
battery specs below - thanks
3.1 Standard discharge Capacity
Min 4,900mAh
- Charge : 0.5C(2,450mA), 4.2V, 0.02C(98mA) cutoff @ RT
- Discharge : 0.2C(980mA), 2.5V cutoff @ RT
* 1C = 4,900mA
3.2 Rated discharge Capacity
Min 4,753mAh
- Charge : 0.5C(2,450mA), 4.2V, 0.02C(98mA) cutoff @ RT
- Discharge : 1C(4,900mA), 2.5V cutoff @ RT
3.3 Charging Voltage
4.2V
3.4 Nominal Voltage
3.6V
3.5 Charging Method
CC-CV (constant voltage with limited current)
3.6 Charging Current
Standard charge: 2,450mA
3.7 Charging Time
Standard charge: 3hours
3.8 Max. Charge Current
4,900mA (not for cycle life)
3.9 Max. Discharge Current
9,800mA (for continuous discharge) 14,700mA (not for continuous discharge)
3.10 Discharge Cut-off Voltage
2.5V
3.11 Cycle life
Capacity ≥ 3,802mAh @ after 500cycles (80% of the Rated Discharge Capacity @ RT)
- Charge : 0.5C(2,450mA), 4.2V, CCCV 0.05C(245mA) cut-off @ RT
- Discharge: 1C(4,900mA), 2.5V cut-off @ RT
3.13 Recovery characteristics
Capacity recovery (after the storage) ≥ 4,278mAh (90% of the Rated Discharge Capacity @ RT)
- Charge : 0.5C(2,450mA), 4.2V, 0.02C(98mA) cutoff @ RT
- Storage : 30 days @ 60’C
- Discharge : 1.0C(4,900mA) 2.50V cut-off @ RT
3.14 Cell Weight
69g max
3.15 Cell Dimension
Cell height : Max.70.80mm Diameter : Φ Max.20.25mm
if I understand correctly, that's 9.8A max discharge (continuous) per cell which means in my 9p configuration a bms that can handle a maximum discharge current of 88A continuous and 132A non-continuous.
voltage due to 7s will be 24v (25,2 nominal)
the 24v 7s bms I can find are generally all much lower amp rated than my 88A/132A figures above
could anyone point me towards a suitable bms please?
battery specs below - thanks
3.1 Standard discharge Capacity
Min 4,900mAh
- Charge : 0.5C(2,450mA), 4.2V, 0.02C(98mA) cutoff @ RT
- Discharge : 0.2C(980mA), 2.5V cutoff @ RT
* 1C = 4,900mA
3.2 Rated discharge Capacity
Min 4,753mAh
- Charge : 0.5C(2,450mA), 4.2V, 0.02C(98mA) cutoff @ RT
- Discharge : 1C(4,900mA), 2.5V cutoff @ RT
3.3 Charging Voltage
4.2V
3.4 Nominal Voltage
3.6V
3.5 Charging Method
CC-CV (constant voltage with limited current)
3.6 Charging Current
Standard charge: 2,450mA
3.7 Charging Time
Standard charge: 3hours
3.8 Max. Charge Current
4,900mA (not for cycle life)
3.9 Max. Discharge Current
9,800mA (for continuous discharge) 14,700mA (not for continuous discharge)
3.10 Discharge Cut-off Voltage
2.5V
3.11 Cycle life
Capacity ≥ 3,802mAh @ after 500cycles (80% of the Rated Discharge Capacity @ RT)
- Charge : 0.5C(2,450mA), 4.2V, CCCV 0.05C(245mA) cut-off @ RT
- Discharge: 1C(4,900mA), 2.5V cut-off @ RT
3.13 Recovery characteristics
Capacity recovery (after the storage) ≥ 4,278mAh (90% of the Rated Discharge Capacity @ RT)
- Charge : 0.5C(2,450mA), 4.2V, 0.02C(98mA) cutoff @ RT
- Storage : 30 days @ 60’C
- Discharge : 1.0C(4,900mA) 2.50V cut-off @ RT
3.14 Cell Weight
69g max
3.15 Cell Dimension
Cell height : Max.70.80mm Diameter : Φ Max.20.25mm