Questions tagged [bms]
A battery management system (BMS) is any electronic system that manages a rechargeable battery (cell or battery pack)
321 questions
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Doorlock ESP32 schematic and PCB design for beginner [closed]
The idea of the project is a door lock with RFID, keypad and open using app; it also has a button KEY1 to open from the inside.
I use a 12.6 V 3 S charger through DC1 jack.
I want to make sure the ...
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ESD in plastic enclosed electronics - Tripping BMS
I have a fully enclosed plastic Battery (1S2P) that mates to a plastic, enclosed hand-held electronics device. Both are IP67 rated.
If I handle the device too much, I can build up a static charge ...
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Wouldn't taking power from part of a lithium battery cause imbalance?
In the attached schematic of a bms, the mosfet gates require around 12v to switch on/off. So they are directly taking power at the 3rd cell B3. Wouldn't this cause imbalance with the remaining cells(...
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Schematic review of solar charger with BMS
Please review my schematic for solar charger with BMS.
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Is it safe to have power lines gently squeezed against BMS module?
3x 18650 batteries in series inside their compartment. If I want to include a BMS module then due to limitations on available space, my only option is to have the power lines gently squeezed against ...
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Is a TVS diode enough to protect BMS MOSFETs from motor inductive kickback?
I’m working on an EV 2-wheeler project (48 V system).
On the BMS side I don’t yet have protection designed for motor inductive kickback, but I want to test the setup without damaging my BMS MOSFETs.
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Battery pack design for 72 V, 410 A UGV – advice on configuration and cell choice
I am designing a 72 V LiFePO battery pack for an unmanned ground vehicle with a turret, and I’d like feedback on cell format.
Subsystem currents (72 V bus equivalent):
Traction (2 motors, 2 drivers ...
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BMS/Fuel Gauge IC + Charging
I’m trying to charge four lithium-ion cells in series (4S) using a charging module that has a built-in BMS, while also using a separate fuel gauge IC (MAX17320) to measure state-of-charge, voltage, ...
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Battery overvoltage detection circuit
I need to design a very simple battery overvoltage protection circuit, i.e. there's a string of cells connected in series, and if any of those cells has a voltage that exceeds a set threshold (...
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Testing the total string voltage over-voltage protection in a Lithium-Ion BMS
I am testing a lithium-ion battery system with two levels of overvoltage protection. The system is equipped with:
Level 1 Protection (Cell Overvoltage): The BMS triggers switches to disconnect the ...
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How to disable Discharge while Charging and vice versa in a common port 2S battery charger
This is a latch circuit-based charger designed for a 2S battery. The main functionality of this board is to allow both charging and discharging through a common 3-pin blade connector while also ...
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Abnormal Cell Voltage Readings in BMS — Possible Short in Middle Cell Line
I have a BMS-related issue that I’d like to get your thoughts on.
In my setup, a CMU (Cell Monitoring Unit) is connected to a battery module to monitor individual cell voltages. After some time, I ...
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MOSFET's heating after 30A discharge load
I am currently working designing a board using a BQ40Z80. The load applied is max 60 A. I have used the recommended MOSFET CSD18540Q5B. This supports 29 A continuous drain according to the datasheet. ...
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Can you spot mistakes in my Li-ion charging and protection circuit? (KiCad)
I designed my first complex PCB using KiCad with hierarchical sheets. I just received and assembled the board myself.
Everything seems to work except the part that handles charging a 3.7V Li-ion ...
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changing my old screw driver batteries [closed]
i'd like to change my dead screw driver batteries , the batteries has no labels as the photos bellow , its charger delivers 6 volts and 300 mA 1.8VA.
my question : is it possible to use Li Ion ...
