Questions tagged [lithium-ion]

Questions regarding Li-ion batteries (Lithium-ion), including proper charging and usage.

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21 views

I want to design a Protection circuitry for ICR18650 Lithium-Ion cells

I am trying to design a protection circuitry for ICR 18650 Lithium-Ion cell (3.7V,2200mAH). I made a battery-pack by connecting 3 cells in series to get output voltage of 11.1V. During charging/...
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26 views

Adding polyfuse to batterypack. Information about adding fuses (self resettable ) is nowhere to be found, so I'm asking here

The plan: 21S8P x2 (connected in parallel for discharge, charged individually) got brand new Molicell INR21700 P42A 4200Mah 45A rated (they are genuine, safety+reliability is paramount so I got them ...
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45 views

Dual (additional) battery E-bike solution

What would be better solution when attemptng to install additional battery on E-bike: Parallel connection and increasing total Ah (batteries are from different manufacturers). Idividual usage of each ...
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44 views

Can I use the Coulomb Counting Method to estimate the SOC of a battery being charged by PV panels?

I have seen a couple questions about Coulomb Counting, but I have not found anything defining an "outside source" providing the current to the battery, this questions might be close, How to ...
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42 views

Charging 18650 li-ion battaries with a balance charger [closed]

I bought this balance charger. Can I charge two 18650 3.7V li-ion batteries with it in balanced mode? If yes - how do I connect them to the balance lead sockets (JST-XH ports)? (On my Li-Po battery ...
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25 views

Lithium ion battery pack busbar thermal calculation

I am designing busbars for lithium-ion battery pack which is 14-series, 9-parallel combination. We have taken busbars sizes as per the industry standard current density 3A/mm2. (Total current 48 A, ...
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49 views

Measurement of internal resistance of a battery

I found two circuits online of almost same approach to measure internal resistance of a battery. Both the methods excite the battery at 50Hz using a square wave and AC voltage drop is measured across ...
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58 views

Charging circuit for LiFePO4 cell

I recently purchased this 32650 LiFePo4 6Ah cell, and I'm looking for simple ways of charging it. I am not able to find LiFePo4 specific chargers that charge single cells, and I was wondering if I ...
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57 views

Calculate Current in Parallel Battery

Given the below pictured 1S parallel battery configuration that draws 20 amps (for example), with the pictured connections, what would the approximate current flow among the various spots along the ...
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1answer
62 views

What models and brands can I find for logic fuses?

I'm trying to find logic fuses like the ones found here. As I'm new user, I couldn't comment there, so I created this new question. That fuse, in my case, is on a Clevo P170EM battery. This battery ...
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27 views

cannot find li-ion 3.8v cylindrical battery u tags [closed]

i cannot find a replacement for this li-ion battery u-tags on internet: https://i.stack.imgur.com/l0Y3a.jpg https://i.stack.imgur.com/Bc5Ru.jpg https://i.stack.imgur.com/OPnaA.jpg height is 44mm ...
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Using an MCP73831 charge controller with a BAS3007A Low VF Schottky Diode Array

I'm working on a design that uses a custom USB charging cable that can be inserted into the device with either polarity. The +5V is rectified using a BAS3007A Low VF Schottky Diode Array. This is then ...
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470 views

Using different 18650 to repair laptop battery

Background: I have a laptop with a bad battery. Upon opening it up and testing the six 18650 cells that make up the battery, I found one to be completely discharged while the other five were still at ...
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51 views

Connecting lithium ion batteries in parallel

I have 6 lithium ion batteries that are from some Android tablets that I've recycled, they are rated as 5000 mAh, 3.8 V and have their own protection PCBs soldered to them. The tablets they came from ...
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41 views

Which standard must Li-ion battery fulfil for CE marking in late 2020, IEC 62133:2012 or IEC 62133-2:2017?

I am looking for a slim CE-certified rechargable battery to put in my product. All of the (very few) certified batteries that I have found are compliant with the IEC 62133:2012 (2nd edition). But that ...
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31 views

Does curling lithium ion battery plates change its performance or reliability?

If you dig into the technical details of how lithium ion batteries work, it discusses "intercalation" of the anode and cathode plates, which basically means that they have a nanoscale comb-...
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62 views

Replace USB diode with something else to reduce voltage drop

So I've made this circuit with a MOSFET and an Op Amp to select a voltage input to my battery. I sort of based it off the voltage selector circuit on the Arduino Uno board, but inversed since that ...
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53 views

Different capacity lithium polymer batteries in parallel

Is there any problem if I put different capacity,from different manufacturer with different specification? This is my current configuration: DW01 Protection Bord is being used on both. But power bank ...
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55 views

How likely is it for a small Li-ion battery to catch fire on it's own?

Today, I have lost a very small e-cigarette with 260mAh battery probably in an area with a lot of chaff and other flamable stuff, I'm really scared, tried searching everywhere but didn't find it! How ...
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19 views

Dead groups in 18650 li-ion battery - Negative 62Volt between B13 and B14 BMS wires?

I have an 18650 battery pack (12p20s) of which 2 parallel groups (12p) recently "died" (their current voltage is 0V or very close to 0 volt (1 of the groups is 0.0v and the other is 0.09v). ...
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1answer
46 views

18650 battery pack with “dead” cells, other cells still usable?

I have an 18650 battery pack (12p20s so 240cells) with 2 parallel groups which recently "died" (voltage is 0v or very close to 0v (0.09v for one of the packs 0.0v for other parallel group). ...
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37 views

How do I charge this odd 4S Li-ion circuit?

I am trying to make a battery pack that will power my electronics. I need to make +7V and -7V. The +7V needs to have a decent amount of capacity. I have proposed a 2S6P circuit for the +7V supply with ...
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24 views

How do bluetooth headsets handle 2C charging current?

I have used a few of those bluetooth headsets that are wireless stereo (TWS) ones and are charged by a case in which you insert them. I haven't used expensive ones, just rebranded chinese ones. All of ...
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34 views

Li-Ion/Li-Polymer Battery Charger mcp73871-2cci/ml Issue

Hope someone can help. I have designed a pcb board based on the mcp73871-2cci/ml. No matter what I change there is no current draw and all the indication LED’s remain on. I have seen some example ...
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557 views

Why does the Tesla battery module capacity not work out in calculation?

https://www.evwest.com/catalog/product_info.php?products_id=463 I am referring to the Tesla battery module listed in the above link. It says a single cell has the following specs: Nominal Voltage = 3....
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27 views

Is it possible to rapidly bring a cell back to equilibrium after charging/discharging by applying a current flow in the opposite direction?

This is an example electrical model of a generic Li-Ion cell. Image credit- https://www.researchgate.net/publication/260712260_Simultaneous_Fault_Isolation_and_Estimation_of_Lithium-...
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28 views

Is it ok to charge a battery with TP4056 while using it, if

Question Is it ok to charge a battery with TP4056 while using it, if the current consumption of the load isn't higher than the charging current of TP4056? and if not why? Trying: To have a 200mah Li-...
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27 views

Lithium Battery Pack Cell Arrangement: Parallel First or. Series First (4P16S or 16S4P)?

I am looking to arrange 64 individual LiFePo4 cells into a large 48V pack. So I can do 4P16S or 16S4P. All cells are new. I can add individual fuses to each cell if necessary. The capacity of each ...
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17 views

Discharging 18650 at higher Peak-Amperage than rated max continuous Amperage?

I am using Sanyo NCR18650BL cells. They are rated for 7A max continuous discharge, but i could not find any info on temporarily discharging them at a higher rate (for example 10A per cell). Is it ...
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38 views

Testing eBike Lithium-Ion Battery [closed]

My wife has an e-scooter, which she's had for about 1 1/2 years. Today she went to ride it and it died within a few minutes and it was, supposedly, fully charged. When we plugged the charger in ...
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35 views

Life expectancy of a CXY-B1 Li-ion battery

Last year I got a National Geographic Explorer 4 camera with two CXY-B1 Li-ion batteries (3.7V, 1000 mAh 3.7Wh). In one year, I used them both for about 7 hours in total over the course of the year (...
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47 views

Li-ion Battery pack not charging, but batteries have voltage

My robot cleaner stopped charging after a week of not being used. I gave the same error as when I removed the battery. I then measured the voltage across the battery terminals, which is 0.01VDC. I ...
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40 views

Is there a relation between the voltage of a Li-ion battery and its charge?

I have a Li-Ion battery-powered device (Wemos, an ESP8266 based) and I can read information about the voltage applied to its input. Is there a relation between this voltage and its remaining charge?
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38 views

Upsizing Li-Ion battery

I have a portable Bluetooth speaker with a very short play-time on a single charge and I want to know if I can swap the battery for a larger one. I've disassembled it enough to see that it's driven by ...
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78 views

2S BMS for Li-ion Battery not charging the batteries

I have been working on a small DIY project. Reference for this project is the following video from YouTube. DIY - 12V Mini UPS While I was able to put together everything and it works for most part, I ...
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62 views

Lithium ion battery CV mode

I am working on lithium ion batteries charging(NMC chemistry, max charge voltage is 4.2). In charging mode after cell reaching 4.2V, charger is going to CV mode and after this Charge ends(based on ...
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41 views

can you make a lithium battery pack with protected batteries

can you make a lithium battery pack with protected batteries? I know there is a protection chip put on lithium battery packs, which makes protected batteries in a battery pack unnecessary, but are ...
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28 views

Is charging current shared between Separate LiPo batteries wired in parallel?

I have two separate 2000mAh LiPo batteries (not RC type the standard 2 wire DIY component type https://coolcomponents.co.uk/products/lithium-polymer-battery-2000mah) Which I want to wire in parallel ...
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1answer
112 views

Using Buck Converter as Solar Charge Controller ? (see pic)

Can I charge Li-Ion safely by connecting PV Panels to a CC CV Buck Converter then through BMS to a 3S3P batteries? This is basically a plan for a very small solar powered device that takes in solar ...
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49 views

How do I prevent my BMS from tripping when solenoid is connected?

I am working on a project that is effectively just a battery powered reticulation system. It is charged through a solar array and cheap MPPT charger, which connects into the battery via the BMS. The ...
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39 views

Is it possible to chain BMS modules?

Let's say i have two 6S Lithium BMS modules (basically protection and balancing) and i want to create a 12S battery pack. Is it possible to chain the power lines of said modules? Just curious
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18 views

Lifep4 BMS and control

Any Lithium battery experts here? My concern is that there is a lot of work and specialized chips on BMS systems that specialize in balancing battery cells for large batteries. Lets say I have a ...
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32 views

Chaining TP4056 modules, the proper way

I know a similar question was asked before, but still, it didn't aswer what I'm looking for. I need to charge a series of 6 Li-ion cells, and maybe 12 in the future for a voltage hungry project. Since ...
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30 views

Should there be a clearance between a lithium polymer cell and a charging circuit?

I'm building a compact portable console that is going to use a 500ma charger board from Adafruit and possibly a 5v 1a boost as well. Past experience has taught me the chips on those little circuit ...
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42 views

Give a second life to a 18650 battery cell, which has 0.1 V?

I have a 7.4V battery pack consisting of 2 x 18650 cells. One of them has 3.4 V, so I tried to charge it with a good old TP4056 board, and it worked: The second 18650 cell seems nearly dead with ~ 0....
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82 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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32 views

Integrating 12v “ups” to a portable fridge

I want to make a portable fridge more portable with Li ion batteries and I'm thinking about how to connect all the pieces. Load is rated for 12V 5A / 24V 2.5A, there is AC/DC SMPS that outputs 13.2v ...
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47 views

Individual cell balancing on multiple packs

UPDATED: I edited my question to clarify I'm building a 4s4p pack with 18650's. What is the best method to achieve on a per-cell balancing & protection if that makes sense? Most of the 4s BMS I ...
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72 views

Connecting 4 18650 batteries in series without bms

I have 4 batteries (18650) 3.7 volt each and i want to connect them in series to get around 15 volts, can i do that without having a bms? Just directly connecting them together? Note: i do have a ...
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37 views

How to tell a battery is LiPo or Li Ion (based on apperance)?

I have this battery and I don't know it is lipo or li-ion: Is there any way to tell a battery is lipo or li-ion based only on apperance?

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