Questions tagged [cell-balancing]

Cell balancing is a method of designing safer battery solutions that extends battery run time as well as battery life.

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Optimal time needed to balance lithium cells

I want to balance a lithium cells with 65 Ah capacity, the threshold to start balancing is SOC=101%; In order to calculate the balancing current,I need to fix the balancing time, so what's the ...
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50 views

Powering the load while charging 3s 18650 battery with BMS balance charger PCB

I want to charge use this battery management system (BMS) balance charging board for charging and management of a 3s 18650 battery. The load and charging port is connected in parallel with power port ...
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34 views

Could I get a second pair of eyes to check if this BMS can be used for charging?

I'm new to electric engineering and electronics in general, so as a first project I'm building a battery using 18650 cells (4S4P). I am aware of the risks when buying from Chinese suppliers on ...
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44 views

Cell balancing of two batteries connected each at the output of parallel converters

I am developing a scalable energy storage application where I connect bidirectional dc dc converters in parallel and battery is connected at output of each converter. I am uploading a block diagram to ...
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77 views

I'd like to know if my own version of a cell balancer will do the job

I have two 3.7v cells in series to make a 7.4v battery. I want to make my own active balancer because I don't have access to buying any cell balancers. I'm using a transformer with 2n turns on the ...
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45 views

3S Lithium-Ion power solution for a project

I have a PCB that runs on 12V throughout the day and consumes 2.3A. The power is supplied for 12 hours using a power supply. The other 12 hours it must run on batteries that have charged during the ...
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67 views

How Charger and Cell Balancer work in BMS?

I'm currently working on BMS for LiIon 4S2P battery pack. Two core components I've choose are BQ77915 balancer and BQ2954 charger from TI. For now, I stick to example schemes from datasheets, but I'm ...
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41 views

designing a supercapacitor balanced charger circuit

I'm currently designing a super capacitor based emergency power supply for a system. The operating voltage of my system is around 10~12 V. Therefore I'm using 4 2.7V supercapacitors in series to gain ...
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Is it possible (feasible) to use a synchronous buck regulator for balancing batteries?

I need to build for a hobby project, a active balancing circuit for large number of LiIon series cells (90 cells). So it needs to be cheap but efficient :) (ie. not resistive dup). After lot of ...
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132 views

Would this design for Li-Ion cell protection+balancing circuit work?

My team and I are currently trying to design a 2S2P battery pack for use in a CubeSat (student project). The pack is planned to be used with 30-40% depth of discharge for a total of around 5800 charge-...
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53 views

Cell balancing in BMS

I have questions with respect to cell balancing please help me 1.when this cell balancing will occur is it when charging the battery or when any cell goes more then rated voltage. 2.can you please ...
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78 views

Switch individual MOSFETs connected across lithium-ion cell for passive balancing

I am working on a passive cell balancing circuit using N-MOSFET. The cell voltage will be monitored by the micro-controller and it can also generate corresponding logic level signal according to over ...
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59 views

Battery Balancing Board Equilibrium Current?

I just bought some balancing boards for a Bluetooth speaker project and realized after the fact there are two different equilibrium current options. I bought both the 2S and 3S versions as I haven't ...
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126 views

What is the best way to balance supercapacitor cells at 700mA peak charging current

So I want to charge a stack of six series-connected super capacitors from a small 10W solar panel. The part number of the capacitors is TPLH-2R7/12WR10X30. https://www.tecategroup.com/products/...
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88 views

Which cell balancing method (active or passive) is best for low-voltage BMS (Battery Management System)?

As a beginner, I am going to design and develop a BMS (Battery Management System) for low-voltage applications (electric bike). So I would like to know which cell balancing method is perfect for low-...
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Nickel battery balancer

TLDR: The question is about retrofitting a balancer to the Ni-MH battery of an existing appliance (that doesn't trickle charge the battery), preferably in the way that will not require frequent access ...
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Why bq76940 cell0 has two capacitors

I'm exploring bq76940 datasheet. I've found such typical scheme for cells connection: Why VC5-VC4, VC4-VC3, VC3-VC2, VC2-VC1 pairs have only one capacitor and VC1-VC0 pair has two capacitors? What is ...
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91 views

How to unite three different batteries in to one powerbank [closed]

I'm absolute beginner in electrical engineering and I need help in building a powerbank using three different batteries with different characteristics. I have a sudden passion to implement this ...
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56 views

Mosfet Selection

I am designing Battery balance system for 16 series Lion(NCR18650) battery pack.I have decided to implement passive balance method.Battery cell voltages will be controlled by MCU and whenever a ...
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299 views

Multi-cell Li-ion battery charging

I am trying to make a charger circuit for a battery pack consisting of 6 lithium ion batteries (cells) in series. Many battery charger ICs support multi-cell charging but do not provide cell balancing ...
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129 views

Building a LiPo battery pack for output 270v DC

so this is related to my other question if anyone wonders. I’m building out a EV battery pack to boost charge a vehicle in real time during heavy duty cycles. The vehicle currently has no external ...
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1answer
105 views

Balance charging battery pack one-half at a time?

I'm trying to wrap my head around how I need to go about balancing charging a few NiMh battery packs. I'm using a HiTec x4 charger, which supports balancing charging up to 6 cells at a time. However, ...
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258 views

Simple Li Ion integrated Charger and balancer

I am currently working on a project, which should contain a Li-Ion battery pack in the form of 8 18650 cells in 4S2P. The main consumers of the build are a class D amplifier and a single board ...
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831 views

LiFePO4 cells - self-balancing in series or parallel?

I am building various banks / packs from individual prismatic LFP cells, nominal 3.2V each. New and pretty large, 60-400AH. I have a good power supply, charge each cell independently, Bulk stage CC ...
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189 views

Battery Balancing system [closed]

I am trying to build a Battery balancer system for 16S8P battery pack.It consist of li-on cells(NCR18650PF). I understood how serial balancing is working properly.If serial cells are not equal,an MCU ...
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142 views

Li-ion battery pack from non- identical batteries

I'm building a battery pack for my portable speaker, and I'm using a random collection of second hand Li-ion cells. I'm going to have cell phone batteries with differing capacities and also 18650 ...
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2k views

Multi-Cell Lithium battery balancing circuit explanation

I found a great application note on building a multi-cell lithium battery charger with cell balancing. http://www.cypress.com/file/70891/download The great thing about this one is that you implement ...
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82 views

Why or when does battery capacity matter in a series circuit?

I have 3 sets of doubled 18650 cells from a laptop battery, and I gather that it can be dangerous to use cells of different capacities in series. This question is more about the theory than practice. ...
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489 views

Do NiMH demand balancing?

Is it fine to charge a pile of 8 2 Ah AA NiMH @ 11.6 V 0.5 A serially? They are from the same packaging and were bought only for use as an 8x pack - they were not used for anything else. Im not sure ...
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9k views

series charging three 18650 batteries with three chargers off the same 5V supply [duplicate]

being from a CS background I am a complete noob at this. I'll keep this short. I have a couple of 18650 batteries that i salvaged from an old laptop battery. I want to make a balanced 3S charger with ...
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148 views

Charging Li-Ion string with cells of different capacities

I was trying to understand what is the worst case scenario of using a string of 4 lithium ion cells (18650 cells, 3.6V nom) in series to form a battery pack, without balance circuitry, to understand ...
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188 views

How can 8.4V stacked super-capacitors (EDLC) not require balancing?

I've recently seen 8.4V stacked super-capacitors which advertise themselves as "not requiring any balancing". Namely, the 196HVC series from Vishay. How can this be true? Even if the cells are ...
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2k views

Finding the right battery management system for LiPo

I am building a "smart" battery by combining a bunch of Samsung 18650 cells with a battery management board that handles charging/discharging/protection. The enclosure I plan to use allows for 4 x 7 ...
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131 views

Large 12 kWh 18650 Lithium-ion power pack - best nSmP configuration [duplicate]

I need to build a 12 kWh lithium-ion power pack for an e-drive system. The cells will be Panasonic NCR 'B' at 3.4 Ah 18650, which have been sourced at about $3.75 a cell. Approximately 1,000 cells ...
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DIY 4*18650 Batteries charger with TP4056 paralel problem with how to balance it

days ago I did this project like the pic which is a DIY for 4*18650 OR 6*18650 (NOW I MADE 4 AND LET`S STICK TO IT) Sony vtc5a charger 3.7 v with new tp4056 with protection (copied from one youtube ...
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554 views

Li-ion battery charging and cell balancing

Is there a solution where a single chip can handle Li-ion battery pack charging and cell balancing as well. I was looking into TI's range of battery management products and their battery charger ...
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108 views

Passive Cell balancing affecting Gas Gauge Coulomb Count

I am designing a solar 7.4V Li battery charger, and want to include gas gauging, and cell balancing. If I use passive cell balancing, I waste power and cause my coulomb counter to lose count. Is there ...
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184 views

Best 12v battery solution

Beginner with battery tech here, so forgive my naivety :) I'm making a portable bluetooth speaker, and am wondering about the best battery solution to use. The amp needs 60W max, and accepts 12-24V....
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803 views

Charge/Discharge a Battery Pack Wired as a Segregated Paralleled Series

This is my first post on EE, so I'll try to be as simple but detailed as I can. I have a 12S10P pack that I want to segregate into a 6S4P + 6S4P, 6S3P + 6S3P, 6S3P + 6S3P for "cautionary" LiIon ...
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700 views

Balance cable for LiPo batteries

I am using 4 2 cell 5000mAh 60C LiPo's in series to drive a robot I am building for Robot Wars (Scorpinator - look out for it). Each battery came with a balance cable built into the discharge cables ...
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14k views

How does a battery balance and protection circuit work?

I am building a 4S LiPo battery pack that I would like to incorporate in a portable speaker project and I need to make sure the batteries will never require maintenance beside replacing them ...
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7k views

How many battery cells in a smartphone?

Are most batteries built into smartphones (e.g. iPhone) single cell batteries? If so, why might that be?
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li-ion balancing with zener diodes

Would there be any potential problems with the below implementation of a rudimentary li-ion balancing/(overcharge protection) circuit? Would a resistor need to be in series with the zeners? simulate ...
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1k views

Battery Pack Management: need to balance during discharge?

I'm looking into the fault detection and monitoring subsystem of out unmanned vehicles (airborne and ground-based) batteries. We employ LiPo-battery packs of various configurations which are charged ...