Intelligent Lithium Battery Module (BM2)
Pumpkin, Inc.
Space-grade 8-cell Li-Ion battery module with coulomb-counting SoC, cell balancing, configurable voltage (2S4P/3S2P/4S2P), and 15A max output — up to 100Wh.
Typed specifications103 values
Discloses 9 of 12 fields engineers filter by in this category (category median 5).
- Energy
- 86 Wh 2S4P (HG2), nominal energy · datasheet p.17 86 Wh 2S4P (HG2) configuration | 100 Wh 2S4P (MJ1) configuration | 100 Wh 2S4P (MJ1), nominal energy | 65 Wh 3S2P (HG2) configuration +7
- Mass
- 692 g eight 18650 cells with SUPERNOVA-compatible heatsink/mounting… · datasheet p.6 542 g eight 18650 cells without heatsink/mounting brackets, typical | 692 g Eight 18650 cells, with optional SUPERNOVA-compatible heatsin… | 542 g Eight 18650 cells, without SUPERNOVA-compatible heatsink / mo… | 700 g max +4
- Capacity
- 3 Ah per cell, HG2 @0.2C & 25C · datasheet p.12 3.5 Ah per cell, MJ1 @0.2C & 25C
- Cell chemistry
- Li-ion (unspecified) product page Li-ion (NCA / NMC) Li[NiMnCo]O2 (H-NMC) / Graphite + SiO (HG2 cell)
- Envelope (L×W×H)
- 48.4 mm Height · datasheet p.6 100 mm Length | 100 mm Width, With SUPERNOVA-compatible heatsink / mounting bracket | 100 x 100 x 48.4 mm with SUPERNOVA-compatible heatsink / mounting bracket
- Supply voltage
- 8.4 V nom. · 2S4P battery configuration · datasheet p.1 6–8.4 V 2S4P battery voltage | 9–12.6 V 3S2P battery voltage | 12–16.8 V 4S2P battery voltage | 8.4 V nom. · 2S4P configurations +4
- Power consumption
- 84 W 2S4P nominal power at cell voltage 4.2 V · datasheet p.17 126 W 3S2P nominal power at cell voltage 4.2 V | 168 W 4S2P nominal power at cell voltage 4.2 V | 84 W peak power | 1 W max +3
- Data interface
- other SMBus (factory-use gas gauge interface) · datasheet p.13 I2C SupMCU, SCPI over I2C
- Operating temperature
- -40 °C Charge · datasheet p.6 -40 °C Discharge | 50 °C max · Charge | 75 °C max · Discharge | -20–75 °C cell surface temperature, discharge (HG2 cell) +1
- Cell configuration
- 2S4P, 3S2P or 4S2P datasheet p.1 3S2P | 4S2P
- Max continuous discharge current
- 10 A battery discharge (source) current, typical · datasheet p.11 20 A max | 15 A max · IDSG_MAX | 15 A
- Nominal voltage
- 8.4 V 2S battery bus · datasheet p.1 12.6 V 3S battery bus | 16.8 V 4S battery bus
- Battery management / protection electronics
- BMS with telemetry gas gauge, SupMCU telemetry; no charging circuitry on board · datasheet p.17
- Connector
- Two identical 14-pin Harwin Datamate M80-4801442 2 mm pitch 2x7 connectors (J206, J207) datasheet p.14
- Survival temperature
- -20–60 °C cell storage 1 month at 40% SOC · datasheet p.12 -20–20 °C cell storage 12 months at 40% SOC | -20–45 °C cell storage 3 months at 40% SOC
- Random vibration
- 14 g RMS tested to NASA GEVS levels · datasheet p.1
- Satellite class
- CubeSat applications: CubeSats · datasheet p.1 nanosat 1-10 kg applications: nanosatellites | nanosat 1-10 kg | small satellites
- Cell model
- 18650 (LG INR18650 HG2 / LG INR18650 MJ1) datasheet p.12
- Number of cells
- 8 2S4P · datasheet p.17 6 3S2P | 8 4S2P
- Max charge current
- 6 A datasheet p.11 20 A max | 6 A max · ICHG_MAX, battery charge (sink) current
- Built-in heater
- yes integrated battery heaters and heatsinks · datasheet p.1
- Heater power
- 8 W 2S4P, PHEATER · datasheet p.11 16 W 3S2P, PHEATER | 8 W 4S2P, PHEATER
- Board format
- PC/104 datasheet p.3 CubeSat Kit bus CSK bus interface
- Protections
- over-current charge datasheet p.1 second-level disconnect 2nd-level battery protection via disconnect | other OC (over-current), 1st-level battery protection | over-temperature OT, 1st-level battery protection | over-charge (OV) OV, 1st-level battery protection +7
- Cell balancing
- active active cell balancing · datasheet p.1
- Inhibit / RBF inputs
- 2 RBF and Separation (Sep) inhibits · datasheet p.18
- Charge temperature range
- 0–45 °C cell surface temperature, charge (HG2 cell) · datasheet p.12 -40–50 °C charge, absolute maximum ratings
Each value is typed with its unit and measurement condition and cites the datasheet page it was taken from. Nothing is guessed: a field that is absent here has not been published by the manufacturer. machine-extracted ✓ checked by NewSpace Market ✓ manufacturer confirmed by the manufacturer.
As published by the supplier11 lines, in the manufacturer's own wording
- Cell type
- 8× 18650-size Li-Ion
- Configuration options
- 2S4P (8.4 V), 3S2P (12.6 V), 4S2P (16.8 V)
- Capacity options
- 72 Wh / 86 Wh / 100 Wh
- Max continuous output
- 15 A
- Peak output power
- 160 W
- Min charge current
- 5 A CC
- Footprint
- 100 × 100 mm
- Intelligence
- SupMCU, coulomb-counting SoC, cell balancing
- Heater
- Programmable
- Interface
- SCPI over I2C
- Protection
- OV, UV, OC, OT with auto fault clearing
About
The Pumpkin BM2 is an intelligent, protected lithium battery module for CubeSat and small satellite power systems. It houses 8 × 18650-size Li-Ion cells in three configurable configurations: 2S4P (5.2–8.4V), 3S2P (7.8–12.6V, 6 cells), or 4S2P (10.4–16.8V), with capacity options of 72Wh, 86Wh, or 100Wh depending on cell grade.
A SupMCU co-processor provides coulomb-counting state-of-charge (SoC) reporting, automatic cell balancing, and a programmable heater. Protection circuits cover overvoltage (OV), undervoltage (UV), overcurrent (OC), and overtemperature (OT) with automatic fault clearing. Maximum continuous output is 15A (160W peak). The module footprint is 100×100mm and interfaces via SCPI over I2C to the host CubeSat bus.
Documentation
Need the full ICD, test reports or a specific revision? Ask the supplier directly.