2 layers90 × 70 mm
EBoard Sidecar
Govish/EBoard-Sidecar
A circuit board for my electric longboard that controls soft power, precharge, and LEDs
119 parts
2 layers82.8 × 63 mm
Bldc BMS
mpater/bldc-BMS26Battery management system for a VESC
- Size
- 82.8 × 63 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 175
- Nets
- 118
- Pads
- 545
- Tracks, vias
- 1,199, 161
- Pours
- 12
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 24 Jun 2018
- Updated
- 23 Aug 2019
Overview
Bldc BMS is an open-source printed circuit board by mpater, from the mpater/bldc-BMS repository on GitHub. It is a 2-layer board of 82.8 × 63 mm with 175 parts on 118 nets, routed with 1,199 tracks and 161 vias.
It is built around the STM32F072C8T6, TJA1042T/3/1J and MIC5219-3.3YMM, with the MIC5239-5.0YM, BQ76200PW and 1N4148W among its other parts. Its parts include 65 resistors, 38 capacitors, 27 diodes, 12 transistors and 8 connectors. It belongs with the power and robots and motor control boards and the STM32 boards of this library.
Main components
10
STM32F072C8T6
LQFP-48(7x7)-40℃~+85℃ 1.65V~3.6V 12bit 12bit 16KB 32 Bit 37 48MHz 64KB ARM Cortex-M0 Built-in FLASH LQFP-48(7x7) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
TJA1042T/3/1J
SOIC-8-40℃~+150℃ 15uA 4.5V~5.5V 5Mbps 70mA SOIC-8 CAN Transceivers ROHSNXP SemiconductorsCAN Transceivers
MIC5219-3.3YMM
MSOP-8-40℃~+125℃ 1 12V 3.3V 500mA 600mV@(500mA) 75dB@(120Hz) Fixed Over Current Protection、Over Temperature Protection、Enable Positive MSOP-8 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMicrochip TechnologyVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsMIC5239-5.0YM
SOIC-8-40℃~+125℃@(Tj) 1 160uVrms 23uA 30V 350mV@(500mA) 500mA 5V Fixed Over Current Protection、Over Temperature Protection、Reverse connection protection、Over Voltage Protection、Enable Positive SOIC-8 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMicrochip TechnologyVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BQ76200PW
TSSOP-16-40℃~+85℃ 40uA 8V~75V 9V~14V TSSOP-16 Charge Pumps ROHSTexas InstrumentsBattery Management
1N4148W
SOD-123150mA 1A 1V@50mA 1uA@75V 400mW 4ns 75V Independent SOD-123 Switching Diodes ROHSSTMicroelectronicsSwitching Diodes
CSD18531Q5A
VSONP-8(5x6)-55℃~+175℃ 1 N-channel 1.8V 134A 14pF 156W 3.5mΩ@10V 3.84nF 36nC@10V 60V N-Channel VSONP-8(5x6) MOSFETs ROHSTexas InstrumentsMOSFETs
MURS360T3G
SMC-65℃~+175℃ 1.28V@4A 100A 10uA@600V 4A 600V 75ns SMC Fast Recovery / High Efficiency Diodes ROHSonsemiFast Recovery / High Efficiency DiodesSMCJ45A
SMC-65℃~+150℃ 1.5kW 1uA 20.6A 45V 55.3V 72.7V TVS SMC ESD and Surge Protection (TVS/ESD) ROHSMDDESD And Surge Protection (TVS/ESD)
ZXMP10A13FTA
SOT-23-55℃~+150℃ 1 P-Channel 1.8nC 10.8pF 100V 141pF 1Ω@10V 2V 625mW 700mA SOT-23 MOSFETs ROHSDiodes IncorporatedMOSFETs
README
readme.mdVESC BMS
Overview
Battery Managment System (BMS) for (but not limited to) an Electronic Speed Controller, specifically for a longboard controller (VESC).
Current battery pack specifications are LiFePO4 (3.2V nominal, ~2.6Ah) in a 6s2p, giving 19.2V with 5Ah (96Wh). Continuous discharge is about 20A (384W) with 30 second pulse discharge of 52A (1kW) and charge current of 5.2A (21.9V), for a 2p configuration.
Scope of the project is to design a BMS to meet the above specifications using off-the-shelf ICs for the battery managment section. A microcontroller circuit would also be incorperated to allow communication between the BMS and controller (SMBus/I2C), contrller and PC (USB-serial) and contrller and VESC (CAN bus).
Texis Instruments (TI) appears to have the most comprehensive set of battery managment systems offerings. These appear to be split up into two main sections: cell monitors and gas gauges. The bq769x0 seires will be used for the cell monitoring, offering bq76920, bq76930 and bq76940 based on the pack size. Currently the top candidats for the gas gauge are bq78350-R1 and bq34z100-R1 but more research is needed to determine which one is better suited.
BMS
- Cell Monitor
- Measure cell voltages and pack current (Coulomb Counter)
- Cell and temperature measurment
- Charge Limit (over-voltage and over-amperage)
- Discharge Limit (under-Voltage and over-amperage)
- Balancing circuitry and autobalancing mode
- 'Gas Gauge' and Battery Managment Controller
- Estimate pack State of Charge (SoC)
- Estimate pack State of Health (SoH)
- Estimate time-to-empty
- Lifetime datalogging
- Aging compensation (optional)
- Self-discharge compensation (optional)
Cell Monitor
bq76930
- 6-19 cells, various chemistries
- 0x08 I2C Address (7-bit), 2.5V LDO, No CRC, 30-TSSOP (PW)
- PN bq7693000DBT
Gas Gauge
bq78350-R1 - Gas Gauge via CEDV
See Technical Reference Sections:
- 9.1.11 - EDV Age Fator - Compensate for cell aging
- 9.1.12 - Self Discharge - estimate self-discharge
bq34z100-R1 - Gas Gauge via Impedance Track
'Impedance Track' module from TI give aging compensation and self-discharge compensation -> not true, bq78350 also has this. This module does not interface with cell monitor and reads only pack volage, how does it konw self-discharge issues?
Microcontroller
The MCU provides a communiciton bridge between the gas gauge and PC (serial via USB) and gas gauge and VESC (CAN bus). The MCU does not need to be powered when either of these functions are not used, thus power to operate the MCU should come from either one of these communiciton ports. (or have MCU sleep when USB-serial timeout or CAN timeout? Wake-up via interrupt on button or USB-serial or CAN? Seems complicated.)
Firware updates done via SWD or Device firmware update via USB DFU.
STM32F072C8T6TR CAN, HDMI-CEC, I²C (SMBus), IrDA, LIN, SPI, UART/USART, USB IC MCU 32BIT 64KB FLASH 48LQFP ARM® Cortex®-M0 STM32F0 Microcontroller IC 32-Bit 48MHz 64KB (64K x 8) FLASH 48-LQFP (7x7)
Reference Projects
- TI Reference Design - TIDA-00449
- TI Reference Design - TIDA-00792
- TI Reference Disign - TIDA-00255
- LibreSolar
- Also using bq769x0 for cell monitor but no gas gauge, that function is done by the MCU (STM32F072)
TODO
- Determine pack size and output - see intro
- Determine cell monitor - bq76930
- Determine gas gauge - bq78350-R1 or bq34z100-R1
- Determine MCU - STM32F072 (USB-to-serial, USB bootloader, I2C, CAN)
- 100% - Schematic capture
- Add pre-charge circuit
- Change balancing circuit from PNP to NPN
- Change power-stange layout to POS rail on top of sheet
- Setup for 6s? or have populated bypass for this layout
- Press button to show SoC LED display with gas-gauge?
- Jumper for MCU to be powered by pack
- 100% - BoM and footprint selection for PCB
- 1000% - Determine PCB footprint size constraights (multiple of 26650 cell size)
- 100% - PCB capture
- 0% - write driver for gas gauge on MCU
- 0% - write interface module for MCU to PC
- 100% - Order PCB and components
- 100% - Assemble components on PCB
- 100% - Hardware validation testing
- TI SMBus to PC moudule is very expensive, looking for something similar to view BMS status
PCB_2019-06 TOFIX
- Swap I2C's on STM32F0 as I2C1 only support SMBus for bq78350-r1
- Mirror STM32F0 debug conn pinout
- Assemble and test PCB
Parts
175| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C1, C3, C4, C6, C7, C8, C9, C28, C30, C31, C35, C36, C37, C38, C39 |
| 12 | 1uF 10V | Capacitor_SMD:C_0603_1608Metric | C2, C10, C13, C14, C15, C18, C19, C20, C21, C22, C23, C27 |
| 11 | 100k | Resistor_SMD:R_0603_1608Metric | R7, R8, R50, R53, R55, R57, R60, R63, R69, R70, R71 |
| 9 | 1k 1% | Resistor_SMD:R_0603_1608Metric | R27, R28, R31, R32, R33, R34, R37, R38, R39 |
| 8 | 10k | Resistor_SMD:R_0603_1608Metric | R40, R43, R44, R45, R48, R49, R51, R52 |
| 8 | Q_NMOS_GSD | Package_TO_SOT_SMD:SOT-23 | Q6, Q9, Q10, Q11, Q14, Q15, Q16, Q18 |
| 7 | 5.6V | Diode_SMD:D_SOD-323 | D7, D10, D11, D12, D15, D16, D21 |
| 7 | GREEN | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D5, D9, D23, D24, D25, D26, D27 |
| 6 | 100R | Resistor_SMD:R_0603_1608Metric | R1, R2, R4, R16, R54, R56 |
| 6 | 2k | Resistor_SMD:R_0603_1608Metric | R11, R64, R65, R66, R67, R68 |
| 6 | 33R | Resistor_SMD:R_2010_5025Metric | R17, R20, R21, R22, R25, R26 |
| 5 | 220R | Resistor_SMD:R_0603_1608Metric | R6, R9, R15, R73, R74 |
| 4 | 1N4148W | Diode_SMD:D_SOD-323 | D17, D18, D20, D22 |
| 3 | 1k | Resistor_SMD:R_1206_3216Metric | R12, R13, R14 |
| 3 | 3.3V | Diode_SMD:D_SOD-323 | D2, D3, D19 |
| 2 | 15pF | Capacitor_SMD:C_0603_1608Metric | C12, C16 |
| 2 | 1M | Resistor_SMD:R_0603_1608Metric | R5, R10 |
| 2 | 1k | Resistor_SMD:R_0603_1608Metric | R62, R75 |
| 2 | 2.2uF | Capacitor_SMD:C_0603_1608Metric | C32, C33 |
| 2 | 22R | Resistor_SMD:R_0603_1608Metric | R76, R77 |
| 2 | 300k | Resistor_SMD:R_0603_1608Metric | R58, R59 |
| 2 | 4.7nF | Capacitor_SMD:C_0603_1608Metric | C25, C26 |
| 2 | CSD18531Q5A | Package_TO_SOT_SMD:TDSON-8-1 | Q2, Q3 |
| 2 | Conn_01x04 | Connector_JST:JST_PH_S4B-PH-K_1x04_P2.00mm_Horizontal | J1, J5 |
| 2 | Jumper_NO | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1, JP2 |
| 2 | SW_Push | Button_Switch_SMD:SW_SPST_PTS810 | SW1, SW2 |
| 1 | 0.005R | Resistor_SMD:R_2512_6332Metric_Pad1.52x3.35mm_HandSolder | R3 |
| 1 | 0.01uF | Capacitor_SMD:C_0603_1608Metric | C5 |
| 1 | 100mA | Fuse:Fuse_0805_2012Metric | F1 |
| 1 | 100uF | Capacitor_SMD:C_1206_3216Metric | C34 |
| 1 | 120R | Resistor_SMD:R_0603_1608Metric | R78 |
| 1 | 220k | Resistor_SMD:R_0603_1608Metric | R61 |
| 1 | 3.3V | TestPoint:TestPoint_Pad_D1.5mm | TP8 |
| 1 | 3.3uF | Capacitor_SMD:C_0805_2012Metric | C29 |
| 1 | 4.7uF | Capacitor_SMD:C_0805_2012Metric | C24 |
| 1 | 470nF | Capacitor_SMD:C_0603_1608Metric | C11 |
| 1 | 5V | TestPoint:TestPoint_Pad_D1.5mm | TP9 |
| 1 | 8MHz | Crystal:Crystal_SMD_5032-4Pin_5.0x3.2mm | Y1 |
| 1 | BAT+ | TestPoint:TestPoint_Pad_D1.5mm | TP6 |
| 1 | BAT- | TestPoint:TestPoint_Pad_D1.5mm | TP10 |
| 1 | BLUE | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D13 |
| 1 | BQ78350-R1 | Package_SO:TSSOP-30_4.4x7.8mm_P0.5mm | U3 |
| 1 | Conn_01x02 | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J9 |
| 1 | Conn_01x06 | Connector_JST:JST_PH_S6B-PH-K_1x06_P2.00mm_Horizontal | J8 |
| 1 | Conn_01x07 | Connector_JST:JST_PH_S7B-PH-K_1x07_P2.00mm_Horizontal | J2 |
| 1 | D_TVS_x2_AAC | bldc-BMS:D_SOT-23_TVS | D29 |
| 1 | Jumper_NC_Small | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP3 |
| 1 | LOAD+ | TestPoint:TestPoint_Pad_D1.5mm | TP7 |
| 1 | MIC5219-3.3 | bldc-BMS:SOT-23-5 | U4 |
| 1 | MIC5239-5.0 | Package_TO_SOT_SMD:SOT-223 | U5 |
| 1 | MMSZ5246B-7-F | Diode_SMD:D_SOD-123 | D4 |
| 1 | MURS360T3G | Diode_SMD:D_SMC | D6 |
| 1 | Net-Tie | NetTie:NetTie-2_SMD_Pad0.5mm | NT1 |
| 1 | Q_PMOS | Package_TO_SOT_SMD:SOT-23-6 | Q5 |
| 1 | RED | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D8 |
| 1 | REGOUT | TestPoint:TestPoint_Pad_D1.5mm | TP3 |
| 1 | SCL | TestPoint:TestPoint_Pad_D1.5mm | TP1 |
| 1 | SDA | TestPoint:TestPoint_Pad_D1.5mm | TP4 |
| 1 | SMBC | TestPoint:TestPoint_Pad_D1.5mm | TP2 |
| 1 | SMBD | TestPoint:TestPoint_Pad_D1.5mm | TP5 |
| 1 | SMCJ45A | Diode_SMD:D_SMC | D1 |
| 1 | STM32F072C8 | Package_QFP:LQFP-48_7x7mm_P0.5mm | U7 |
| 1 | TJA1042T-3 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U6 |
| 1 | USB_B_Micro | bldc-BMS:USB_Micro-B_Amphenol_10103594-0001LF_Horizontal_circular | J10 |
| 1 | XT60_FEMALE | bldc-BMS:XT60PW-F20 | J6 |
| 1 | XT60_MALE | bldc-BMS:XT60PW-M20 | J3 |
| 1 | ZXMP10A13FTA | Package_TO_SOT_SMD:SOT-23 | Q17 |
| 1 | bq76200 | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U1 |
| 1 | bq76930 | Package_SO:TSSOP-30_4.4x7.8mm_P0.5mm | U2 |
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Questions
How big is the Bldc BMS PCB?
It measures 82.8 × 63 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Bldc BMS use?
175 parts, built around the STM32F072C8T6, TJA1042T/3/1J, MIC5219-3.3YMM and MIC5239-5.0YM. 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 Bldc BMS KiCad files?
From the mpater/bldc-BMS repository on GitHub, at the commit this page was made from: the board is bldc-BMS.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bldc BMS design in my own project?
Its repository states no licence, so its author keeps all rights: ask mpater before reusing the design.