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3S Battery management system

1 year ago 309
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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

Documents

main

PCB

BOM

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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