HardLabs

6S BMS

jacksterb1234·6S_BMS·Archive/6S_BMS_Passthrough.kicad_sch

This repository ships a schematic but no board layout.

About the 6S BMS PCB

6S BMS is an open source STM32 PCB design by jacksterb1234, published on GitHub. It is a board, with 46 components from 19 distinct parts.

Its main chip is the STM32L431KCUx, from the STM32 family. Other key parts include the BQ76925RGER, TVS2700DRV and TCAN3404DRBRQ1. By type, the board carries 19 capacitors, 15 resistors, 5 connectors, 4 ICs, 1 transistor and 1 switch.

It belongs with the power & battery designs in this gallery.

From the project

A custom 6-series (6S) Battery Management System PCB designed in KiCad for robotics and high-power applications. The design features cell voltage sensing, balancing, and CAN bus communication for integration with external controllers.

A custom 6-series (6S) Battery Management System PCB designed in KiCad for robotics and high-power applications. The design features cell voltage sensing, balancing, and CAN bus communication for integration with external controllers.

- 6S cell configuration — supports 6 series lithium cells - Analog Front End (AFE): Texas Instruments BQ76925 for cell monitoring and balancing - CAN Bus communication: TCAN3404 transceiver for robust data transmission - Cell voltage sensing with dedicated sense schematic (6SCellSense) - Passthrough board schematic for power routing - Custom KiCad footprints…

Main components on the 6S BMS

BQ76925RGERSTM32L431KCUxTVS2700DRVTCAN3404DRBRQ1

6S BMS bill of materials (BOM)

46 components, 19 distinct parts.

QtyPartRefs
1
BQ76925RGER
U1
1
STM32L431KCUx
U2
1
TVS2700DRV
U3
1
TCAN3404DRBRQ1
U4
1
ZXTP25040DFHTA
Q1
1
Conn_01x08_Pin
J1
2
Conn_01x02_Pin
J2, J4
2
Conn_01x04_Pin
J5, J6
1
SW_SPST
SW1
1
BZT52C5V6
hongjiacheng
D1
2
4.7uF
Samsung Electro-Mechanics
C1, C10
1
10uF
Samsung Electro-Mechanics
C2
8
100nF
YAGEO
C3, C4, C5, C6, C7, C8, C12, C13
8
1uF
Samsung Electro-Mechanics
C11, C14, C15, C16, C17, C18, C19, C20
1
200kΩ
UNI-ROYAL(Uniroyal Elec)
R1
1
10Ω
UNI-ROYAL(Uniroyal Elec)
R2
3
4.7kΩ
UNI-ROYAL(Uniroyal Elec)
R3, R4, R5
2
10kΩ
UNI-ROYAL(Uniroyal Elec)
R6, R7
8
100Ω
UNI-ROYAL(Uniroyal Elec)
R9, R10, R11, R12, R13, R14, R15, R16

6S BMS design files

The KiCad project lives in the jacksterb1234/6S_BMS repository on GitHub; these links point at the commit this page was built from.

6S BMS: common questions

What microcontroller does the 6S BMS use?

The 6S BMS is built around the STM32L431KCUx, from the STM32 family.

How many components are on the 6S BMS?

46 components, from 19 distinct parts. The full bill of materials is listed on this page.

Where can I download the 6S BMS design files?

From the jacksterb1234/6S_BMS repository on GitHub, which has the schematic; the links under Design files point to each one.

Can I use the 6S BMS design in my own project?

The repository has no license, so all rights stay with jacksterb1234. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the 6S BMS without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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