Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [battery-balance]

18 questions
5
votes
3 answers

How to design a simple circuit for detecting unbalanced Li-ion parallel cells?

I would like to design a "safety" device able to tell me if a 3 parallel Li-ion cells module is voltage balanced or not. EDIT (after @winny's comment): It’s needed if the user connects cells with different SOC/voltage, for e.g. if the cells are…
zetyty
  • 163
  • 7
5
votes
6 answers

Is it possible for series connected battery cells to provide different currents?

I know current through series elements is always the same. I was wondering if the same is true for series supplies (batteries) or if it is possible for one supply to provide more or less current than another series supply. I ask because a project…
N. Berg
  • 159
  • 11
3
votes
1 answer

Modify lithium battery pack balancer

This is the lithium battery pack balancers available to me: As Robojax has extensively explained in this video, this module is capable of balancing batteries with 67mA current (4.2v/62ohm) that is way too slow for my application because my charging…
AKTanara
  • 261
  • 1
  • 8
2
votes
1 answer

Battery balance circuit gives zero volts at output

I've built the setup below for 2 Lithium-ion batteries in series: The battery balance module is an FDC-2S-2 (I can't find a datasheet, weirdly): Problem: Even though I read 7.5 V between B+ and B-, I read 0 volts between P+ and P-. I tried to…
CaveScientist
  • 375
  • 1
  • 10
2
votes
1 answer

Identify chip on 2S BMS / Balance card

I picked up a bunch of Chinese-made 2S BMS / Balance boards. As is the norm with inexpensive Chinese boards, they came with essentially NO documentation aside from how to hook the board to the batteries and load. I've identified all of the devices…
Dwayne Reid
  • 23,390
  • 2
  • 35
  • 67
1
vote
1 answer

Secondary Connection for Transformers in Active Balancer using LTC3300-1

I am currently trying to implement an active balancer based on the LTC3300-1 (I have proposed the diagram based on the directions in the datasheet) but, about the connection for the secondaries of the transformers, I do not know what is the right…
imt_blake
  • 325
  • 10
1
vote
0 answers

Transformer connection for active balancer

I am currently looking to implement an active balancer based on the LTC3300-1 for a 3-S LiPo array but I am unsure with the transformers, the datasheet shows how to connect the IC for a 3-S array. I have a question with the C6 pin transformer…
imt_blake
  • 325
  • 10
1
vote
1 answer

Lithium battery pack charge controller and balancer module function (HX-4S-F30A)

I tried to use this module for a 4S 18650 battery pack: Beside charge controlling it is supposed to balance cells and this is where my issue emerges. If I put some unevenly charged cells in the pack, lets say 3 cells at 3 V and one at 4 V, and…
AKTanara
  • 261
  • 1
  • 8
1
vote
3 answers

Balance charge unknown number of LiPos in series

This exact question has already been asked here, but no answer was given so I'm reposting it. I want to charge an unknown number (between 1 and 8) of 1s LiPos in series with my balance charger (ISDT T8). I know how to manually connect a fixed number…
Amine Kchouk
  • 71
  • 2
1
vote
2 answers

Is it possible to charge a laptop with a DC-DC converter using a 12V deep cycle battery

Am just curious if I can use a DC-DC converter and 12v deep cycle battery to power a laptop directly.
John Zenith
  • 111
  • 4
0
votes
0 answers

Limitations of Li-ion (18650) balance charge using current bypass method

I have built a battery pack using some old (but working) 18650 cells I had. The 4S4P battery pack diagram follows: I tried to balance charge it with my IMAX B6AC v2 (4S, TVC = 4.2V, i=2.5A, w/ balance connector). It fails to charge parallel #3 and…
gstorto
  • 669
  • 1
  • 7
  • 18
0
votes
0 answers

Identity of SOT23-5 Lipo Battery Monitor IC

Please can anyone help with identification of a sot 23-5 package marked GCLK in a single channel of a rechargeable lipo balance circuit
Rallycrosscar
  • 11
  • 2
0
votes
0 answers

How to solder two 3.7 V LiPo batteries in series and then balance charge them

For a project, I need to power an Arduino Nano 3.3 V BLE. The Nano accepts 5-21 V on its VIN pin and then regulates that voltage down to the 3.3 V it needs. To do this, I've got two 3.7 V 1200 mAh LiPo batteries, and I want to connect them in series…
beyarkay
  • 101
  • 2
0
votes
0 answers

Is using a non-balance protected lithium-ion battery ok?

I am building a project where I use 4 stepper motors. Since they require a lot of power I am considering using a Lithium-Ion battery for them. This is what I was looking at: https://www.onlybatteries.com/showitem.asp?ItemID=22517.128&cat1=&uid= Here…
Ana Lovejoy
  • 13
  • 3
0
votes
2 answers

What should a 12v solar battery read while in use?

I have a 12v solar system with 2 12v batteries (One marine, other a car battery). My inverter has a minimum voltage input of 11.0v and peak of 15.0v, but when I'm running it under load, I get a voltage of 10.9v - 11.8v, and 12v-14v when not…
Couch Mango
  • 55
  • 9
1
2