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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15 views
power tool battery pack rebuild
I am currently in the process of replacing the cells in several 20v dewalt power tool battery packs with some Samsung 30q high capacity cells. I was also considering LG HG2 cells, yet they are rated ...
0
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1answer
43 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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30 views
4S 18650 Custom Charging Circuit
I hope your day goes well.
I have a question regarding building a 4+S 18650 charging circuit. I have 4S1P pack with 4 batteries in series and I am trying to build a charging circuit for these ...
2
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3answers
75 views
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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74 views
Using BMS in serial with parallel charging
Is it possible to connect two 4.2V 18650 Li-ion batteries in series but have them charged in parallel with 5V Usb wall charger? I have HX-1S-3576 as BMS. If i use 4 of these BMS as shown in the ...
2
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0answers
49 views
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 ...
0
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1answer
77 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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0answers
45 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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0answers
198 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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1answer
100 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 ...
0
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1answer
65 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, ...
0
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1answer
173 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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1answer
413 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 ...
0
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1answer
151 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 ...
0
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3answers
107 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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2answers
1k 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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votes
1answer
62 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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389 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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1answer
5k 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 ...
2
votes
1answer
122 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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0answers
180 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 ...
0
votes
2answers
1k 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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0answers
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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1answer
2k views
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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0answers
500 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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0answers
96 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 ...
0
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1answer
153 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....
3
votes
3answers
734 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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2answers
598 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 ...
8
votes
1answer
12k 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 ...
4
votes
1answer
6k 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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2answers
3k views
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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3answers
963 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 ...
