3S Battery management system

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STD 3S Battery management system

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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)

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BOM

BOM download Purchase Parts

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