Application — Motor drive power
Requirement — The challenge was to handle 24V regulated auxiliary power and real-time status monitoring within one pack in the motor drive power application.
Solution — We built a 24V regulated DC-DC converter and CAN communication monitoring into a Li-ion 20S pack (DC 72V, 21Ah).
Result — Two simultaneous outputs — a main DC 72.0V rail at up to 30A (50A peak @ ≤1.5s) plus regulated 24V 10A outputs — housed in approx. 9kg, complete motor drive power in a single pack.
If you are considering a custom build to a similar specification, submit a requirements sheet. Our engineer will review it and respond.
Specification
Specifications
| Product Code | DMOP-72LI21-B50-CV24 |
|---|
General
| Model | DMOP-72LI21-B50-CV24 |
|---|---|
| Dimension | Approx. L300 x W416.3 x H75mm (including protrusions) Approx. L300 x W380 x H75mm (excluding protrusions) |
| Weight | Approx. 9kg |
Battery ① Electrical specifications
| Battery Type | 20S Li-Ion |
|---|---|
| Nominal Voltage | 72.0V (60.0–84.0V) |
| Nominal Capacity | 21.0Ah |
| Energy | 1,512Wh |
| Max Discharge Power | Main – DC 72.0V, 2,160W Converter (regulated) 1 – DC24V, 240W |
| Charging Method | CC-CV(Constant Voltage with Limited Current) |
| Standard Charging Condition (0.2C) | 84.0V±1%, 4.2A, CC-CVEnd Current : 0.42A (0.02C) |
| Max Charging Condition | 84.0V±1%, 10A, CC-CVEnd Current : 0.42A (0.02C) |
| Standard Discharge Current | |
| Max Discharge Current | Main – DC 72.0V, 30A Converter (regulated) 1 – DC24V, 10A |
| Instantaneous Discharge Current | Main – 50A @ ≤1.5s |
| Discharge Cut-off Voltage | 60.0V3.0V per cell |
| Communication module (CAN 2.0a) | Option (CAN): voltage, current, temperature and state of charge monitoring |
Battery ② Operation · Safety
| Max Temperature Range | Charging: 0 – +45°C Discharging: -20 – +55°C Storage (recommended): +5 – +30°C |
|---|---|
| Battery Management System | Module configuration: 1P Overcharge cutoff: 4.20±25mV per cell Overcharge recovery: 4.00±50mV per cell Over-discharge cutoff: 2.90±25mV per cell Over-discharge recovery: 3.30V±50mV per cell Overcurrent cutoff: 110±25% per module Short-circuit protection: Yes Over-temperature cutoff: Yes Cell balancing: Yes Control method: MOSFET |
| Storage Life | Up to 6 months under no-load conditionsState of charge: SoC 60% Environment: ambient 25°C, humidity ≤70% |
| Cycle Life | ≥60% of nominal capacity after 500 cycles Charge/discharge condition: standard charge, then discharge at the standard discharge current down to the cut-off voltage Environment: ambient 25°C, humidity ≤70% |
Terminals · Control
| Terminal configuration | DISCHARGEPositive(+) : 1P(+) Negative(-) : 1P(-) CHARGEPositive(+) : 1P(+) Negative(-) : 1P(-) |
|---|---|
| Terminal specification | Rating: 600V, 100A (per pin) Operating temperature range: -40°C – +85°C |
| Terminal fastening and wiring | Bolt: SCREW M6X16 nut Thread: M6*P1.0(B5.0) Recommended tightening torque: 12kgf·cm |
| Charge/discharge switch (ON/OFF) | Option: charge/discharge rocker switch (ON/OFF) |