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Questions tagged [bms]

A battery management system (BMS) is any electronic system that manages a rechargeable battery (cell or battery pack)

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Analysing 42v to 3.3v DC converter circuit & component identification

I'm analysing a circuit responsible for generating 3.3v for a stm32f103c8t6 on a battery management system(10s). Its a completely proprietary battery management system with nothing online about it so ...
ManeGote's user avatar
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1 answer
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Are the data pins necessary on a mini USB connector used only for charging a tablet? Is the ID pin used for OTG?

I have an older tablet, and I plan to replace the charging-only micro USB connector (which does not transmit data) with a USB-C connector. However, upon examining the pinout, I noticed that the two ...
condor12's user avatar
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What type of device is this on TP5000 Application Exapmle?

Data Sheet (Chinese) Question 1 Component N1 looks similar to a mosfet but doesn't look like other ones that I have seen for N-Channel. What is this component supposed to be? This example is for LFP ...
sdolan's user avatar
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2 votes
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Powering a microcontroller with an Li-ion Battery --> How to choose a protection?

The introduction I'm currently working on a low power project that is using the ESP32-S3 microcontroller variant from Seeed Studio, the XIAO Series ESP32-S3 (Official wiki: https://wiki.seeedstudio....
Benjamin's user avatar
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2 answers
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Can I charge my 3S2P 18650 battery (12.6v) with a normal 12v power adapter if I use a BMS with built-in balancing+protection? [closed]

First off, I would like to stress the fact that I am no electrical engineer or anything of the sort, just a hobbyist that is into this kind of stuff. So please bear with me, as I know a few things ...
Respoda555's user avatar
-1 votes
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39 views

Can this circuit be designed as an active cell balancer?

I want to design a active cell balancing circuit as the figure below. Q1 and Q8 transistors will always be switched on and off to storage a current in the coil. After that, lets say Cell2 has minumum ...
altasak's user avatar
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How best to charge a 120 V series assembled Li-po?

I purchased ten 12 V, 30 Ah batteries to be run in series up to 120 V. The problem is that they each come with a 12 V, 3 A internal BMS. I assume I must disconnect their internal BMS as the combined ...
Nick D. 's user avatar
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2 answers
74 views

Bipolar 2s1p Li-ion array BMS and charging

For powering my portable circuit, I need a bipolar power supply of ±2.5 V. The circuit is low-power, but requires very precise power. For its stabilization, I am using ADM7154 regulators for positive ...
nighma's user avatar
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1 vote
1 answer
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When to include a fuse in a battery protection circuit?

I am working with the MAX17320 and I am looking at two MAX17320 example circuits from AD - the MAX17320 Eval Board and the MAXREFDES1299 for inspiration. Each schematic is roughly the same, except the ...
user1045680's user avatar
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1 answer
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Can I make my Battery Pack Much Efficient in my DIY Power Bank?

I was having a project of a DIY power bank as a backup for my phone. I need to use super thin batteries for this application. my goal is to make this power bank as efficient as possible. now I want to ...
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Electrically Changing Battery Pack's Setup

I was planning to make a small power bank that has a 6650mAh Battery capasity which has 7 950mAh Batteries. now my plan is to use it to discharge using a single battery and charge the other batteries ...
Nsj09's user avatar
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1 answer
71 views

Vax Blade 4 BMS board issue (5 x 21700 cells Li-ion 18v battery)

I have a problem with our VAX blade 4 4.0ah battery. Referencing this page: Repairing a 5-cell Li-ion battery: dead 21700 cells replaced, but BMS still reporting error when charging it seems that a ...
Rodp's user avatar
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3 answers
119 views

Reduce the current from a Li-ion battery with 6S 18650 cells and BMS to a motor [closed]

Beginner in electronics looking for advice. I got a 6S BMS board from AliExpress rated at 25 A. I need to reduce current to 5-6 A. The board goes in a mobile vacuum cleaner, its motor is max. 120 W. I ...
Aldas 's user avatar
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What is this shorted diode from a Bosch BMS for an eBike?

I am currently trying to repair a Bosch BMS from an ebike and found a shorted diode so far. I can't figure out what exact model the diode is can anybody help me to identify it?
Bobtimus's user avatar
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1 answer
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Can a 4.2V cell BMS function with 3.6V cell?

I'm trying to make a Li-Ion battery with a BMS (Battery Management System). All BMS I found were for 4.2V cells, so my question is, can I use it for a 3.6V cells? Note: These are LiIon cells, NOT ...
Gonzalo García's user avatar
1 vote
1 answer
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BMS 3S 25A circuit diagram explanation [duplicate]

Can somebody help me figure out what the circuit in the red box does? What is the purpose of the six FETs and how do they behave once P- is connected to the negative supply voltage? What is the ...
JoeyB's user avatar
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1 answer
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6-pin SMD identification on BMS smart controller

Can anyone help me identify the component in the attached picture? I've never seen a similar package.
salvatore cirasa's user avatar
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14 views

Balancing Circuit for 2S Battery Using MAX77958 and MAX77960

I am currently working on designing a battery-powered device and have decided to use the MAX77958 and MAX77960 for the battery management system (BMS). While reviewing the datasheets and the ...
SKGadi's user avatar
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Simulink - too much current is drawing from batteries

I am trying to simulate an active cell balancing circuit shown in the figure. However I have some problems. If I only turn on and of the switches I get normal,calculated current passing through ...
altasak's user avatar
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1 answer
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Using two "tool batteries" in parallel - Need a BMS?

I have built a Bluetooth speaker, which is currently powered by a single 18V "drill battery" (Bosch BAT609 battery, to be exact - each pack has 5 lithium ion cells, and I assume, its own BMS ...
GWR's user avatar
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1 answer
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4P 3.7V 32650 Rechargeable Battery 8200mAh needs 1 , 4 BMS or none?

I intend to put 4 X 3.7V 32650 Rechargeable Battery 8200mAh in parallel to keep 3.7V but increase the amperage so the battery last longer. Looking around is very confusing if for paralel I need or no ...
Teodor's user avatar
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Protector and Charger Circuit for 2P2S 18650 Battery Pack

This post is in addition to my previous post of a different design I was exploring. I am trying to design a custom circuit akin to a BMS that allows for the charging of 2P2S battery pack whilst also ...
scelectron's user avatar
1 vote
1 answer
167 views

Designing a BMS for 2S2P 18650 batteries

I am trying to design a BMS for 4 18650 batteries in a 2S 2P configuration. Some of the requirements are: I would like to charge and discharge from the same connectors I would like to implement a ...
scelectron's user avatar
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0 answers
58 views

LiFePo4 Battery's BMS is clipping when my relay switch kicks-in

simulate this circuit – Schematic created using CircuitLab My trolling motor had no "kill-switch" that would turn the motor off should I get dumped into the water. So I purchased a ...
FishingFool's user avatar
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0 answers
28 views

Designing a Li-ion charge-discharge controller circuit

I have an interview test task to design a device that contains several sensors of different purpose and a heater. The problem is that the device has to be portable, so I calculated the required Li-ion ...
2222's user avatar
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0 answers
110 views

TL431 With LM317 BMS

I am trying to make a BMS circuit that I saw online using a TL431, but as I am new to electronics I am having some problems when using the TL431. When I wanted to check the reference pin of the TL431,...
Fuad Frehat's user avatar
1 vote
1 answer
101 views

Choosing Contactors for an EV Battery Pack

I’m designing a battery pack and am uncertain about which contactor to select. Many electric vehicles (EVs) use three contactors: one each in the positive terminal, negative terminal, and precharge ...
Son Pham's user avatar
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0 answers
22 views

BMS using BQ28Z620 (2s)

I am having a bit of trouble with understanding the provided implementation from the datasheet. I don't understand why the serial resistor connected to VC2/Pin11 is only 5R and has no 0.1uF decoupling ...
Robin Y's user avatar
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221 views

MOSFET selection for high current

I found a few teardown videos for the Daly BMS and the JK-BMS. These BMS are rated for higher currents like 150A - 250A. Based on the teardown, the 16S Daly BMS uses JMSH0804AE N-channel MOSFET. ...
Momobear's user avatar
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1 vote
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42 views

Issues with AP9101C Lipo protection IC and the auto-wakeup feature

I'm developing a pcb for a product powered by a single-cell li-ion battery. Since I couldn't find an appropriate battery with a built in protection ic, I decided to add one to my design. After ...
Marcel Król's user avatar
0 votes
1 answer
47 views

What is a solution to handle multiple same capacity lipo cells in parallel?

It seems that BMS's are for batteries in series... If I have 3 x 1200mAh lipo cells to get pretty much a large 3600mAh 1S pack... I believe I know that I can't just parallel wire single-cell BMS's ...
Jacob David C. Cunningham's user avatar
1 vote
0 answers
106 views

BMS abnormal behavior

I would like to power the lighting system of a small cabin using 3 DeWalt 18 V, 5 Ah battery packs. The system consists of six 10 W bulbs each (12/24 V) and a 20 W, 12 V spotlight. DeWalt battery ...
Marco Volpatti's user avatar
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0 answers
33 views

1S Li-Ion BMS Design

I want to use AP6633 Protection IC along with MCP73833 Charging IC for 1S Lithium-Ion Battery. The issue is pinout of AP6633. I really dont have any idea how to connect AP6633 Pins to MCP73833, More ...
Zunuran Nasrullah's user avatar
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0 answers
21 views

Changing grounds during start up

We have a system with a CANBUS controlled Battery Management System (BMS) and a PCB with microcontroller. The BMS provides 12V and an isolated CAN ground at all times, but naturally only supplies main ...
Sylvester's user avatar
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24 views

I would like to use two BMS's on a single pack

I would like to use TWO BMS's on a single lithium pack. putting them in parallel. Q is - do i need to also run separate balance wires to each BMS , OR, just run the 2nd separate B- input to the 2nd ...
Lithium Moto's user avatar
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0 answers
51 views

2-S or 3-S USB type-c PD LiPo battery charger

I am trying to implement a 2-S or 3-S USB type-c Power Delivery (USB-C PD) battery charger. I am using this video of reference which uses a 16pin female usb type-c connector (part: TYPE-C-31-M-12) and ...
imt_blake's user avatar
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1 vote
0 answers
78 views

Adjust lithium BMS over discharge voltage

I have a few 2-series lithium battery protection modules coming from different sources, but all of them are the same classic chinese ones based on Hycon's HY2120 chip. These are all shuting down at ...
Javo Agarre's user avatar
2 votes
1 answer
134 views

Blown fuse detection parallel battery bank

I have 384 Nissan Leaf battery modules that I wish to design a blown fuse monitoring system for. Each module consists of 2 x LiIon cells in series with a separate fuse for each cell, The modules are ...
M rusten's user avatar
0 votes
1 answer
131 views

Help with selecting charging IC for LiPo battery charge management

I have a project for which I have a 1 cell LiPo battery, and of course I need a BMS to monitor it and charge it/ensure it doesn't get discharged too far. I also want LED indicators to inform of the ...
Arthur Isnt original's user avatar
2 votes
0 answers
85 views

Design of heatsink - increase in ambient temperature during heat transfer

I have gone through few resources available online on how heat flow from die to ambient and how its is modelled as current source, thermal resistance and ambient temperature as voltage source. I have ...
KIRAN S's user avatar
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1 vote
3 answers
2k views

Lithium ion BMS bypass (or hack) [closed]

I'm trying to turn a scavenged scooter battery into an e-bike one. I can balance charge it via the original BMS but discharging is the issue: P+ and P- are only delivering about 4 V. More wires, with ...
aerobil's user avatar
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1 vote
2 answers
142 views

Li-Ion BMS which protects parallel cells in addition to series cells

Background If li-ion cells are arrayed (series x parallel — S x P or P x S) to form a battery, it is generally recommended to manage parallel stacks of series cells (P x S) independently, such that ...
kando's user avatar
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2 votes
1 answer
289 views

What type of IC is this? Marking code 6003-001 NQ97P

Please help me to identfy this IC. Known information: Marking code 6003-001 NQ97P Part of the battery of Fimi x8 Mini Drone Connected to a SC8906 charger IC
andik vanroy's user avatar
2 votes
0 answers
72 views

Design a 12 V battery pack for portable electronics project [closed]

I am doing some electronic project for a portable escape room business that I am running with my wife, the project are basically running or Arduino to take some inputs and switch on a 12 V solenoid ...
AHMAD Q ALBASRI's user avatar
2 votes
1 answer
78 views

Reason for P-MOSFET between the charge N- FET and charge pin of bq76930

I am currently working on a final year project which is a device like a power-bank, but this will be able to charge both phones and laptops. After a lot reading and research I finally considered using ...
HGO's user avatar
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0 votes
0 answers
536 views

How to charge a battery pack through BMS using same pins as for the BMS output

I'm bulding a 18650 4S pack for a speaker and I'm using a BMS capable of balancing and protecting the batteries like on the picture below. The manufacturer advertizes you can both charge and discharge ...
Dan's user avatar
  • 1
1 vote
2 answers
131 views

Lithium-ion battery pack in series or parallel

The goal is to build a 200 V Lithium-ion battery pack using 21700 cells. I am trying to make a design decision on lithium-ion battery pack architecture for an electric vehicle and it boiled down to ...
EDMdude's user avatar
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0 votes
0 answers
54 views

Unknown DC-DC topology

I am working with a BMS that has a daughterboard attached that I assumed was a DC-DC converter but now I am not so sure. Here is the broad circuit overview that I have derived: simulate this circuit &...
pbandjazz's user avatar
  • 337
-1 votes
2 answers
273 views

LiFePO4 battery charger and inverter in parallel

I've got a brand new LiFePO4 battery (200 Ah) with internal BMS, got the Blue Smart IP65 Charger from Victron Energy and an inverter. The easiest way to connect them is in parallel (off course adding ...
user348431's user avatar
1 vote
1 answer
150 views

Choosing correct BMS for 12V lithium battery pack with 39 cells

I have 39 lithium cells, I want to make a 12 V battery pack with as much AH as possible. From what I've read, all BMS are only for cells connected in series. So for example, all 12 V battery packs are ...
Danny Gersh's user avatar

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