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STD 3S Battery management system
Mode: Editors' pick
- 6
Update time：
2021-03-10 17:37:38
Creation time：
2018-11-07 10:50:23
Description
DIY BMS management system for Li-ion 3S (3 cells-in-series) battery pack.
It balances the cells to prevent cell over-voltage in passive way - burns energy in high wattage resistors.
It also prevents from cell under-voltage by disconnecting the load.
LED's signalising what cell is now being balanced (burning energy).
The process data are exposed to parent system over I2C communication bus.
Github repository for uP firmware.
[https://github.com/Zbysekz/3S_BMS](https://github.com/Zbysekz/3S_BMS)
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | PC817 SMD | U5,U6,U7 | PC817 SMD | 3 |
| 2 | MCP1700T-3302ETT | U8 | SOT23-3 | 1 |
| 3 | 100n | C7 | C1206 | 1 |
| 4 | 470u | C8 | CAP-D8.0XF3.5 | 1 |
| 5 | IRF4905 | Q5,Q6 | TO-220AB | 2 |
| 6 | MMBT2222A | Q23,Q8,Q1 | SOT23-3 | 3 |
| 7 | SWITCH-6x6x5_TH | SW1 | SWITCH-6X6X5_TH | 1 |
| 8 | PINHD-1X6 | JP1 | HEADER-MALE-2.54_1X6 | 1 |
| 9 | 10R | R15,R17,R19 | KNP-200 | 3 |
| 10 | 47k | R16 | R_805 | 1 |
| 11 | 47k | R18,R20,R13,R1,R7 | R805 | 5 |
| 12 | 47 | R21,R22,R23 | AXIAL-0.3 | 3 |
| 13 | 10M | R24,R5,R9 | R805 | 3 |
| 14 | 3M3 | R25,R8,R10 | R805 | 3 |
| 15 | 220R | R14,R4 | R805 | 2 |
| 16 | 4k7 | R3 | R805 | 1 |
| 17 | 4k7 | R11,R2 | AXIAL-0.3 | 2 |
| 18 | 10k | R6 | R805 | 1 |
| 19 | 10k | R12 | R0805 | 1 |
| 20 | Header-Male-2.54_1x4 | H1 | DIP-1X4P-2.54MM-M | 1 |
| 21 | 1N5822 | D2 | DO-27 | 1 |
| 22 | WJ2EDGVC-5.08-4P | P3 | WJ2EDGV-5.08-4P | 1 |
| 23 | IRLML0030TRPBF | Q2,Q3,Q4 | SOT-23(SOT-23-3) | 3 |
| 24 | Header-Male-2.54_1x3 | P4 | HDR-3X1/2.54 | 1 |
| 25 | DUO LED 5MM | LED1 | DUO LED 5MM | 1 |
| 26 | 100n | C9,C10,C11 | C0805 | 3 |
| 27 | 22p | C1,C2 | C0805 | 2 |
| 28 | Header-Male-2.54_1x1 | P1 | HDR-1X1/2.54 | 1 |
| 29 | 8MHZ | X1 | XTAL-TH_2PIN-L11.05-W4.65-PITCH4.88 | 1 |
| 30 | ATMEGA48PA-AU | U9 | TQFP-32_7X7X08P | 1 |
| 31 | RGE5005A/16V | F2,F1 | PTH | 2 |
| 32 | WJ2EDGVC-5.08-2P | P2,P5 | WJ2EDGVC-5.08-2P | 2 |
| 33 | LED-3MM | LED3,LED4,LED5 | LED-3MM/2.54 | 3 |
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