ohahaha

BM3451-5 string balance protection board

Overview

Suitable for domestic Makita power tool 21V battery, 5 strings of lithium batteries

## Description

The project was imported from KiCAD and has been checked. The attached Gerber is the one I have made.

Chip model: BM3451TNDC-T28A

Discharge NMOS model: 30H10K

Charge NMOS model: RU3030M2

NTC: B3950/10K

Mine is 30H10K removed from the old protection board, the front is GSD type mos, and the back can be attached with SGD type mos.

The sampling resistor is selected according to the current. The sampling voltage is 0.1V protection, and the 5 milliohm resistor corresponds to 20A current

## The

actual verification picture is as follows

! [1.jpg]

The third battery reaches 4.2V and the protection board starts to discharge and balance, as shown below

! [2.jpg]

The top cover of the battery pack is as follows

! [3.jpg]

Design Files

bm3451_5.zip

Related Devices

Devices	Class	introduce	Datasheet
B2B-EH-A(LF)(SN)	The connector;The connector	Number of pins: 2 Connector type: Header Contact type: Male Pin spacing: 0.098" (2.50mm) Series: EH EH connector EH2.5mm	Download
RC0603FR-07330KL	Passive components;The resistor	Resistance (Ohm): 330K Accuracy: ±1% Power: 1/10W Temperature Coefficient: ±100ppm/°C 330K OHM 1/10W 1% 0603 SMD	Download
SI2302S	Discrete semiconductor;MOS (field effect tube)		Download
RC0603FR-071KL	Passive components;The resistor	Resistance (ohms): 1K Accuracy: ±1% Power: 1/10W Temperature coefficient: ±100ppm/°C	Download
1N4148WS	Discrete semiconductor;Switching diode	Reverse recovery time (trr): 8ns DC reverse withstand voltage (Vr): 75V Average rectified current (Io): 150mA Forward voltage drop (Vf): 1V @ 10mA	Download
RC0603FR-076K98L	Passive components;The resistor	Resistance (ohms): 6.98K Accuracy: ±1% Power: 1/10W Temperature coefficient: ±100ppm/°C	Download
PADP-10V-1-S	Wire terminal plastic shell		Download
1N4007	Discrete semiconductor;General diode	DC reverse withstand voltage (Vr): 1kV Average rectified current (Io): 1A Forward voltage drop (Vf): 1.1V @ 1A 1000V, 1A, VF=1.1V@1A	Download

All reference designs on this site are sourced from major semiconductor manufacturers or collected online for learning and research. The copyright belongs to the semiconductor manufacturer or the original author. If you believe that the reference design of this site infringes upon your relevant rights and interests, please send us a rights notice. As a neutral platform service provider, we will take measures to delete the relevant content in accordance with relevant laws after receiving the relevant notice from the rights holder. Please send relevant notifications to email: bbs_service@eeworld.com.cn.

It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

Hot

Technical Resources More

Search Datasheet?

Supported by EEWorld Datasheet

Technical Videos More

Forum More

Update:2024-11-22 13:00:56

EEWORLD University Hall----Principles of Quadcopter
Principles of quadcopter : https://training.eeworld.com.cn/course/5483The principle of quadcopter
Xunwei 3399 development board uses ADB commands to transfer files to Android devices
3. Transfer filesPress and hold the win key + R key, enter cmd, click OK, and open cmd.exe as shown in the figure below:The default here is the Android device (development board), the USB debugging mo
Launchpad msp430 PWM experiment
#include "msp430g2231.h" #define PWM BIT6 int main( void ) { unsigned int i; unsigned char flag; flag = 1; i = 0; // Stop watchdog timer to prevent time out reset WDTCTL = WDTPW + WDTHOLD; TACTL = TAS
[Review of Arteli Development Board AT32F421] 3. Questions about the operation of external settings, is it not easy to use?
[i=s]This post was last edited by ddllxxrr on 2021-4-11 16:38[/i]I thought bit manipulation was very simple, but it was this simple operation that ruined my whole day. I had to declare that the bit ma
[National Technology N32G430] 5. Add OLED display task
[National Technology N32G430] 4. Make a simple and easy-to-use multi-task scheduling system https://bbs.eeworld.com.cn/thread-1217018-1-1.html On the premise of creating the task above, drive ssd1306
[ATmega4809 Curiosity Nano Review] Main Technical Data
Below is the official technical information of the ATmega4809 Curiosity Nano development board:Development board website ATmega4809 Curiosity Nano Hardware User Guide (Hardware Description) ATmega4809

Datasheet More

Circuits More