4 layers144.7 × 95.9 mm
Cell Monitoring Unit (CMU)
VikingMotorsports/Battery-Management-System-Capstone-2026
The BMS Capstones deliverables
186 parts1
2 layers117.2 × 65 mm
BMS v21
martymsc/Carring-bmsBms system for lithium based cells. Carring because it cares :D
- Size
- 117.2 × 65 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 179
- Nets
- 145
- Pads
- 515
- Tracks, vias
- 1,979, 107
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 9 Sep 2024
- Updated
- 9 Sep 2024
Overview
BMS v21 is an open-source printed circuit board by martymsc, from the martymsc/Carring-bms repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 117.2 × 65 mm with 179 parts on 145 nets, routed with 1,979 tracks and 107 vias.
It is built around the BQ76PL455APFCR, C2012X7S2A105K125AB and CRCW0805200RFKEAC, with the 2V7002KT1G-VB, APHCM2012SYCK-F01 and CRGCQ2512F33R among its other parts. Its parts include 96 resistors, 30 capacitors, 15 transistors, 4 diodes and 4 connectors. It belongs with the power boards of this library.
Main components
12
BQ76PL455APFCR
TQFP-80(12x12)-40℃~+85℃ 5.1V~5.5V 50uA 6~16 Balancing IC、Monitoring IC Not supported Support TQFP-80(12x12) Battery Management ROHSTexas InstrumentsBattery Management
C2012X7S2A105K125AB
0805100V 1uF X7S ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSTDKMultilayer Ceramic Capacitors MLCC - SMD/SMT
CRCW0805200RFKEAC
0805-55℃~+155℃ 125mW 200Ω Thick Film Resistor ±1% ±100ppm/℃ 0805 Chip Resistor - Surface Mount ROHSVishay IntertechnologyChip Resistor - Surface Mount
2V7002KT1G-VB
SOT-23(TO-236)-55℃~+150℃ 1 N-channel 2.5V 2.8Ω@10V 250mA 25pF 2pF 300mW 400pC@4.5V 5pF 60V N-Channel SOT-23(TO-236) MOSFETs ROHSVBsemi ElecMOSFETs
APHCM2012SYCK-F01
0805-40℃~+85℃ 140° 150mcd 20mA 2V 590nm 590nm 75mW Discrete Diode Water Clear Yellow 0805 LED Indication - Discrete ROHSKingbrightLED Indication - Discrete
CRGCQ2512F33R
2512-55℃~+155℃ 1W 200V 33Ω Thick Film Resistor ±1% ±200ppm/℃ 2512 Chip Resistor - Surface Mount ROHSTE ConnectivityChip Resistor - Surface Mount
MM3Z6V2T1GX
SOD-3231 Independent 300mW 5.86V~6.53V 500nA@3V 6.2V ±5% SOD-323 Zener Diodes ROHSNexperiaZener DiodesRR1220P-104-D
0805-55℃~+125℃ 100V 100kΩ 100mW Thin Film Resistor ±0.5% ±25ppm/℃ 0805 Chip Resistor - Surface Mount ROHSSusumuChip Resistor - Surface Mount
1N4148W
SOD-123150mA 1A 1V@50mA 1uA@75V 400mW 4ns 75V Independent SOD-123 Switching Diodes ROHSSTMicroelectronicsSwitching DiodesCRCW0805360RFKEAC
0805-55℃~+155℃ 125mW 360Ω Thick Film Resistor ±1% ±100ppm/℃ 0805 Chip Resistor - Surface Mount ROHSVishay IntertechnologyChip Resistor - Surface Mount
ERJ-8RQF1R0V
1206-55℃~+155℃ 1Ω 250mW Thick Film Resistor ±1% ±200ppm/℃ 1206 Chip Resistor - Surface Mount ROHSPanasonicChip Resistor - Surface MountCRCW080551K0FKEAC
0805-55℃~+155℃ 125mW 51kΩ Thick Film Resistor ±1% ±100ppm/℃ 0805 Chip Resistor - Surface Mount ROHSVishay IntertechnologyChip Resistor - Surface Mount
README
README.mdCarring-bms
Bms system for lithium based cells. Carring because it cares :D
The bms is based on an arduino leonardo board from Longan Labs (https://www.longan-labs.cc/1030008.html) and a battery monitor IC from Texas Instruments called BQ76PL455A.
Current revision:
- Battery cells voltage readout over serial
- OV and UV protection with contactor control
- Precharge circuit contorl
- Isolation between contol MCU and battery
- Mcu supply is from the car, bms ic is powered by the battery
Problems:
- Cell balancing is present but wasnt working in last revision
- Same for the drain current measurment
Future goals:
- Battery drain current measurment
- Can bus logging implmentation
- Switch to integrated MCU, either an STM or an RP
- Fuel gauging
- Charging control
- Update the bms ic to a newer BQ79654
- Add stackable funcionality
Parts
179| Qty | Value | Footprint | References |
|---|---|---|---|
| 18 | C2012X7S2A105K125AB | SamacSys_Parts:CAPC2012X145N | C2, C3, C4, C5, C6, C7, C10, C11, C12, C13, C14, C15, C16, C17, C25, C30 +2 |
| 16 | CRCW0805200RFKEA | SamacSys_Parts:RESC2012X50N | R23, R38, R40, R42, R43, R45, R47, R49, R51, R53, R55, R57, R59, R61, R63, R91 |
| 15 | ERJ-8ENF1001V | SamacSys_Parts:ERJ8ENF1000V | R65, R66, R67, R68, R69, R70, R71, R72, R73, R74, R75, R76, R77, R78, R79 |
| 14 | 2V7002KT1G | SamacSys_Parts:SOT96P237X111-3N | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14 |
| 14 | APHCM2012SYCK-F01 | SamacSys_Parts:LEDC2012X50N | 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 |
| 14 | CRGCQ2512F33R | SamacSys_Parts:RESC6432X65N | R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22 |
| 14 | ERJ-6GEYJ202V | SamacSys_Parts:RESC2013X65N | R39, R41, R44, R46, R48, R50, R52, R54, R56, R58, R60, R62, R64, R80 |
| 14 | MM3Z6V2T1G | SamacSys_Parts:SOD2512X110N | Z1, Z2, Z3, Z4, Z5, Z6, Z7, Z8, Z9, Z10, Z11, Z12, Z13, Z14 |
| 14 | RC0805FR-07100KL | SamacSys_Parts:RESC2012X60N | R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34, R35, R36, R37 |
| 14 | RR1220P-104-D | SamacSys_Parts:RESC2013X65N | R1, R2, R3, R4, R5, R6, R7, R8, R82, R86, R87, R88, R89, R90 |
| 5 | C0805C104K5RACTU | SamacSys_Parts:C0805 | C1, C18, C22, C23, C28 |
| 4 | 1N4148W | SamacSys_Parts:SODFL3816X120N | D1, D2, D3, D4 |
| 4 | GRM31CR71H475KA12L | SamacSys_Parts:CAPC3216X180N | C19, C21, C24, C29 |
| 3 | ERJ-6ENF51R0V | SamacSys_Parts:ERJ6ENF1000V | R83, R84, R85 |
| 2 | 43650-0420 | SamacSys_Parts:43650-04YY_18192063 | J3, J4 |
| 2 | CRCW0805360RFKEA | SamacSys_Parts:RESC2012X50N | R92, R93 |
| 2 | ERJ-8RQF1R0V | SamacSys_Parts:ERJ8_B_BW_R_LW_CW_D | R95, R96 |
| 1 | 66201621122 | SamacSys_Parts:66201621122 | J1 |
| 1 | 66202021122 | SamacSys_Parts:66202021122 | J2 |
| 1 | BQ76PL455APFCR | SamacSys_Parts:QFP50P1400X1400X120-80N | IC1 |
| 1 | C0805C223K5RACTU | SamacSys_Parts:C0805 | C26 |
| 1 | C1210C185K3PACTU | SamacSys_Parts:C1210 | C27 |
| 1 | CRCW080551K0FKEA | SamacSys_Parts:RESC2012X50N | R81 |
| 1 | ERJ-U6QJR39V | SamacSys_Parts:RESC2012X60N | R94 |
| 1 | VJ0805D391KXCAJ | SamacSys_Parts:CAPC2012X145N | C20 |
| 1 | ZXTN4004KQTC | SamacSys_Parts:ZXTN4004KQTC | Q15 |
| 1 | ~ | SamacSys_Parts:CANBed v1.2e | U1 |
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Questions
How big is the BMS v21 PCB?
It measures 117.2 × 65 mm and has 2 copper layers, 1.6 mm thick.
What parts does the BMS v21 use?
179 parts, built around the BQ76PL455APFCR, C2012X7S2A105K125AB, CRCW0805200RFKEAC and 2V7002KT1G-VB. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the BMS v21 KiCad files?
From the martymsc/Carring-bms repository on GitHub, at the commit this page was made from: the board is BMS v21.kicad_pcb and its schematic BMS v21.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the BMS v21 design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).