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BMS (Battery management system products)

BG3-12/24/36-A/L/N 12V~36V BMS with SMBUS/I2C port

battery protect moudle Feature
*For 12V~36V Li-Ion/LiFePO4/NIMH/PB battery, charge/discharge protect and communicate
*Mounted on battery-pack, provide OCP/OVP/LVP/OTP function and fuel gauge meter
*With SMBUS/I2C port,can communicte with upper computer system
*Use "Coulomb Accumulation" method as capacity fuel gauge
*Rating working current: 10A, 20A, 30A. (defined when order)
*Need input battery data(type, voltage, capacity) when place order
*Size: 115x40x9mm

PCM-Lxx  14.4V~37V 4~10s Li-Ion, LiPo, LiFePO4 Battery Protection Moudle

battery protect moudle Feature
*Applies to 4~10s Li-ion, LiPo, LiFePo4 battery-pack
*Monolithic topology, fewer external components, higher reliability.
*Over charged/discharge protection value can be programmed by JTAG.
*Ultra low power consumption MCU core, 50uA only.
*Build-in automatic 50mA cells balance circuit.
*Rating working current: 5A, 10A, 25A, 50A. (defined when order)
*Programmed over current protection value and time-delay  seting.
*Size: 70x50x10mm

BMS-Lxx  4~15s Li-ion/Polymer/LiFePo4 Battery Management Moudle

36V LI-ION BMS Feature
*Applies to 4~15s( 14.4~48V) Li-ion, LiPo, LiFePo4 battery-pack
*Measuring kinds status: voltage, current, temperature, capacity...
*Monitoring each cells' voltage, OC/OD level can be adjusted by hardware
*Optional cells balance circuits, balance current  up to 300mA
*Rating working current: 5A, 10A, 25A, 50A. (defined when order)
*Programmable protection values setting (voltage, current, temperature)
*Size:100x60x9 mm for 7~10S type, accept customized size

Technical Tips for Battery management system design

Tip-1: SMBus protocol used in BMS design

The System Management Bus (SMBus) is a two-wire interface through which various system component chips can communicate with each other and with the rest of the system. It is based on the principles of operation of I2C*. SMBus provides a control bus for system and power management related tasks. A system may use SMBus to pass messages to and from devices instead of tripping individual control lines. Removing the individual control lines reduces pin count. Accepting messages ensures future expandability. With System Management Bus, a device can provide manufacturer information, tell the system what its model/part number is, save its state for a suspend event, report different types of errors, accept control parameters, and return its status. 
Click here to look up all standard SMBus Command

Tip-2: How to select a proper battery management product for your power system

There are many items for selecting a proper battery management system product for your battery power system.
At least you should check or require the  following 8 items:
1.Battery applied (type, voltage, capacity);
2.Discharging Current (Maximum discharge current, average discharge current);
3.Charging Current;
4.Discharging protections (Low voltage, over load, short circuit...);
5.Charging protections (Over current, Over temperature, Over voltage, time out...)
6.Idle power consumption (??mA at sleep mode)
7.Battery fuel gauge function;
8.Communication function (SMBus? I2C? ...) or External LCD display.