Intelligent Protected Lithium Battery Module with SoC Reporting (BM2)
Pumpkin, Inc.
Pumpkin's flight-qualified, protected lithium-ion battery module (BM2) with state-of-charge reporting, configurable cell topology and capacity, for CubeSats and small satellites.
Typed specifications114 values
Discloses 10 of 12 fields engineers filter by in this category (category median 5).
- Energy
- 86 Wh 2S4P (HG2), nominal energy · datasheet p.17 100 Wh 2S4P (MJ1), nominal energy | 65 Wh 3S2P (HG2), nominal energy | 100 Wh 3S2P (MJ1), nominal energy | 86 Wh 4S2P (HG2), nominal energy +3
- 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 | 3.5 Ah standard cell LG INR18650 MJ1
- Cell chemistry
- Li-ion (NCA / NMC) Li[NiMnCo]O2 (H-NMC) / Graphite + SiO (HG2 cell) · datasheet p.12
- Envelope (L×W×H)
- 6.2 mm Height of components above PCB · datasheet p.4 100 x 100 x 48.4 mm with SUPERNOVA-compatible heatsink / mounting bracket
- Cycle life
- 500 datasheet p.12
- Supply voltage
- 8.4 V nom. · 2S4P battery configuration · datasheet p.1 6 V min · 2S4P configuration | 9 V min · 3S2P configuration | 12 V min · 4S2P configuration | 8.4 V max · 2S4P configuration +10
- 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 Nominal Power, 2S4P configuration | 126 W Nominal Power, 3S2P configuration +6
- Data interface
- other SMBus (factory-use gas gauge interface) · datasheet p.13 I2C SupMCU, SCPI over I2C
- Operating temperature
- -40 °C min · Charge · datasheet p.6 -40 °C min · 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 Sourcing (discharging) | 15 A max · IDSG_MAX | 20 A max · Sourcing (discharging)
- 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 User-provided captive harness (+$1000)
- 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 satellite
- Cell model
- 18650 (LG INR18650 HG2 / LG INR18650 MJ1) datasheet p.12 18 650 | 18 650 | LG INR18650 MJ1 | LG INR18650 HG2 +1
- Number of cells
- 8 2S4P · datasheet p.17 6 3S2P | 8 4S2P
- Max charge current
- 20 A Sinking (charging) · datasheet p.6 6 A max · ICHG_MAX, battery charge (sink) current | 20 A max · Sinking (charging)
- 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
- CubeSat Kit bus CSK bus interface · datasheet p.1 custom overall footprint (with brackets) is roughly 100x100x48mm, or…
- 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 active
- 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 supplier15 lines, in the manufacturer's own wording
- Battery configuration option 2s4p
- 8 cells, 5.2-8.4 V
- Battery configuration option 3s2p
- 6 cells, 7.8-12.6 V
- Battery configuration option 4s2p
- 8 cells, 10.4-16.8 V
- Cell capacity option 1
- 2500 mAh (72 Wh with 8 cells)
- Cell capacity option 2
- 3000 mAh (86 Wh with 8 cells)
- Cell capacity option 3
- 3500 mAh (100 Wh with 8 cells)
- Cell option (custom)
- User-provided 18650 cells (+$1000)
- Power connectors (standard)
- 2 x 14-pin
- Power connector option (custom)
- User-provided captive harness (+$1000)
- Mounting footprint (with brackets)
- 100 mm x 100 mm
- Minimum interface
- V+ (BAT_POS) and V- ((D)GND)
- Additional interface signals
- SCL_SYS, SDA_SYS, -RESET, OFF_VCC
- CUBESAT bus compatibility
- 104-pin CubeSat bus connector via optional Battery Bus Interface Module (BBIM)
- Architecture compatibility
- Pumpkin SUPERNOVA nanosatellite architecture; mountable inside 1U/1.5U/2U/3U CubeSats without brackets
- Includes
- BM2, RBF shorting block, power/RBF/separation harnesses, USB Debug Adapter with cable, Windows GUI, Python SCPI GUI
About
The Intelligent Protected Lithium Battery Module (BM2) is Pumpkin flight hardware, described as flight qualified and space proven, that provides a protected lithium-ion battery pack with state-of-charge (SoC) reporting for CubeSats and small satellites. It is electrically compatible with most CubeSats and small satellites; a compatible Electrical Power System (EPS) is required to charge the batteries. The BM2 can power loads directly at battery voltage and can serve as a power source for a compatible EPS. In typical applications, a compatible EPS charges the batteries when external power (e.g., via solar panels) is available, and discharges the batteries when they are the only available power source (e.g., during eclipse). An EPS used with the BM2 typically requires the BM2 to be configured for the battery voltage the EPS supports (2, 3, or 4 lithium cells in series).
The BM2’s minimum interface is via its V+ (sometimes called BAT_POS) and V- ((D)GND) terminals; additional functionality is available via SCL_SYS, SDA_SYS, -RESET and OFF_VCC terminals. Pumpkin offers a Battery Bus Interface Module (BBIM) to connect the BM2 to a standard 104-pin CubeSat bus connector. The BM2 has a 100x100mm footprint when its L-shaped mounting brackets are installed; this footprint is directly compatible with Pumpkin’s SUPERNOVA nanosatellite architecture and may be compatible with many others. The brackets can be removed to mount the module inside a 1U/1.5U/2U/3U CubeSat. The BM2 is described as electrically compatible with all known current small-satellite dispensers and launch vehicles.
Configuration options include (B) Battery Configuration: 2S4P (8 cells, 5.2-8.4V), 3S2P (6 cells, 7.8-12.6V), or 4S2P (8 cells, 10.4-16.8V); (C) Individual Cell Capacity: 2500mAh (72Wh with 8 cells), 3000mAh (86Wh with 8 cells), or 3500mAh (100Wh with 8 cells), plus an option for user-provided 18650 cells (+$1000); and Power Connectors: standard 2 x 14-pin, or user-provided captive harness (+$1000). Includes one BM2 Battery Module; one shorting block for RBF (Remove-Before-Flight) inhibit during transport; one 300mm 14-conductor power & control harness (flying leads, or with connectors on both ends for use with the EPSM1); one 300mm 2-conductor RBF inhibit harness with flying leads; one 300mm 2-conductor Separation inhibit harness with flying leads; one Pumpkin USB Debug Adapter with USB A-to-B cable (one per invoice regardless of BM2 quantity ordered); a downloadable Windows-based GUI for firmware updates; and a downloadable Python-based GUI for SCPI-based command and telemetry development (requires a Total Phase Aardvark I2C/SPI Host Adapter, not included). A variant with a Battery Switch Module (BSM) is also shown on the product page.
Documentation
- 710-01640-F_DS_BM_2.pdf PDF source: www.pumpkininc.com ↗
- 710-01764-A_DS_BSM_1.pdf PDF source: www.pumpkininc.com ↗
- PUMPKIN_BM2_mass_properties.pdf PDF source: www.pumpkininc.com ↗
Need the full ICD, test reports or a specific revision? Ask the supplier directly.