Questions tagged [liion]

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Experiences with18650 li-ion batteries from chinese brands (BAK, EVE, DLG)?

I know certain chinese brands such as ultrafire have a very bad reputation but i was wondering if better known chinese cell brands (of which products are sold by reputable sellers such as batterybro....
4
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1answer
146 views

Constant voltage charging phase of Li-ion batteries

I've read on batteryuniversity.com that the constant voltage (saturation) stage of Li-ion charging adds approximately 10% of SOC compared to charging with only the constant current (CC) charging phase....
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2answers
51 views

Multiple CC/CV charge controllers in parallel?

Can multiple cc/cv charge controllers (TS1052 for example, which is rated for 100mA drain current) in parallel configuration to achieve a higher drain current? (input signals also connected in ...
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45 views

Connecting 36V LiIon packs in series to get ~120VDC to run lawn mower

I'm converting my electric plugin lawnmower to battery power. I was able to get 3 used e-bike identical model 36V 5Ah packs (obviously not matched with respect to lifetime usage). Each pack has its ...
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1answer
32 views

LiIon Cell protection/charging circuit wtih AP9211, (Or other IC)

I'm trying to design a simple protection/charging circuit for a single LiIon 18650 Cell and think I made a mess with the Diodes Incorporated AP9211 IC [1]. It's my own fault as I skimmed through that ...
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42 views

Tesla Model S BMS Solar

I have six 2012-2018 TESLA MODEL S MODULES I have been using two in series for a 48 volt inverter with no BMS (set the low voltage and high voltage limits accordingly). Now that my energy needs are ...
0
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1answer
98 views

Li-ion vs Li-Po batteries cut-off protection

I am confused with the differences between Li-ion batteries (like 18650) and Li-Po (the flat ones). I know that basically they are both lithium ion, but when I want to buy I see that LiPos have always ...
2
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2answers
70 views

How do I match a battery pack voltage to my solar panels?

We're building an autonomous boat which should be powered by solar panels. We want to put two 100W solar panels on it. Most panels I see are 18V and for redundancy we want to link them in parallel. ...
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1answer
60 views

Charging Li ion pack 6S/10P [closed]

I want make Li-ion pack, (6s/10p), this is the li-ion cell type: sony_us18650vtc6 Also I am using BMS from Litech (https://www.litechpower.com/product-detail/HCX-D596V1LI06S70A_01.html) All cells same ...
0
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1answer
190 views

Can I safely replace flat Lipo battery with a Li-Ion round battery pack on a constantly powered device?

I did some research, but didn't find the exact situation. I have a device that has a battery inside and is powered by a 5V 4000mA USB-C charger. The device requires the battery to be connected at all ...
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32 views

Designing BMS for 4S LiIon Pack

currently I'm working on 4S(2P) BMS mainly focused on TI's ICs. I'm stuck at the start - First, for now I want to use BQ2954 IC for charger, and BQ77915 IC for balancing and protection. Now, I'm not ...
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44 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). ...
0
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1answer
140 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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0answers
59 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 ...
2
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1answer
131 views

AMS1117 and 3S Li-Ion battery

I wanted to make a 3S li-ion battery pack. I also wanted to use an AMS1117 5.0 and 3.3, but when I read the datasheet, it said, that it can work with maximum of 12V. Would I kill my AMS1117 if I ...
1
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2answers
152 views

How to convert Li-ion battery voltage to 1.5 V?

I want to use Li-ion batteries to power devices that work with AA (1.5 V) batteries, to have best autonomy and to be able to recharge it easily (using a battery manager module). I had thought of a ...
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73 views

Replacing Nimh battery to Li-ion in hybrid cars

is it a good idea to replace a Nimh battery in hybrid car (like prius model 2012) to Li-ion battery without any problems.
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1answer
304 views

max Discharge current of li-ion battery (temporary)

Is my assumption correct that the main limiting factor of maximum discharge current of a Li-ion battery is that the cell heats up too much due to its internal resistance/the current flowing through ...
0
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2answers
193 views

Low voltage cutoff

A while back when I ordered a 3S Li-ion protection board I didn't think about low voltage protection so I made a small circuit using an opamp. Is this gonna be good or will the magic smoke escape?
0
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1answer
227 views

How can I determine LI-ion battery charge while varying the load?

I'm building an autonomous boat which contains a li-ion battery pack and I want to know how much charge it still left in it. To do this I measure the voltage of the battery pack. I let it run for ...
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2answers
63 views

Is there a 12V stable output regulator for liion? [closed]

I need 12V for my system and I want to use 18650 cell. Problem is, that everywhere I looked, only boost converters are sold, which only multiply input voltage.
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2answers
3k views

18650 battery pack - How to remove (thick) nickel strip?

I am trying to find a good way to remove (quite thick/strong welds) nickel strip from 18650 battery packs without damaging the 18650 cells...and having a relatively flat surface (on the cell's ...
0
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2answers
94 views

Li-Ion Battery Undervoltage Protection

I designed a PCB with a microcontroller and a load that draws 3A on average with current spikes of up to 9A. The PCB is powered by a high-drain Li-Ion battery. I want to add a simple undervoltage ...
5
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1answer
791 views

What is the effect on lithium ion batteries from long term storage in sub-freezing temperatures?

I am designing an off-grid power system for a mountain cabin that is not used in the winter. The ambient temperature can get as low as -20deg F (-29deg C) during the winter. Due to snow and other ...
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0answers
49 views

How to safely replace NiCD/NiMH with Li-ion in a small electric screwdriver? [duplicate]

I'd like to repair and re-use a small Bosch electric screwdriver. It currently has a battery of 3 small AA-type rechargables (unmarked cardboard wrapping) that has almost the same occupancy volume of ...
0
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1answer
176 views

what is the max charge current of BQ2057?

I have gone through the datasheet of this single cell Li-ion charge IC BQ2057 but I couldn't find the charge current detail
4
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2answers
6k views

Replacing NiMH with Li ion [duplicate]

I have a rechargeable vacuum cleaner with NiMH batteries, 1800mAh and 14.4 volts, 12 cells. The charger is 18v 200mA. The batteries have now died. Can I replace the batteries with 4 cell Li-ion in ...
2
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3answers
2k views

Is it OK to reduce the charging current for a Li-ion 18650 battery?

I am using NCR18650 batteries with the tp4056 charging module. When I connect the charger at 2.8 V (fully discharged), the tp4056 IC is getting hot at a 1 A charge current. Is it OK to ...
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0answers
93 views

is it OK to use battery while charging? [duplicate]

I am using the tp4056 module with protection to charge NCR18650 li-ion battery. is it OK to connect to the load to the battery while it is charging? I am using a booster to boost 3.7V to 9V(load ...
0
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2answers
3k views

Charging 8 LiIon 18650 cells in parallel

I'm working on project that is Powered with 8 LiIon batteries/cells connected in parallel. Everything Works fine until batteries run out of "juice". For charging module I decided to use TP4056(@ 1A). ...
0
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1answer
176 views

Using a battery as a voltage source in a DC DC converter to supply a second battery?

I was wondering if I could use a battery as Vin to a DC DC converter to charge another battery. Example: Using a Li Ion battery pack and having it go through the DC to DC converter to charge a LiPo ...
-1
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1answer
34 views

Li-ion Modded Powerbank Question

So I got this single Li-ion power bank. It's a 18650, and I wanted to add another 18650 in parallel. I want to use the same circuit which produces a constant 5v. Is it safe to do it that way? in ...
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0answers
757 views

Help designing a satellite MPPT board [SPV1040] [duplicate]

I'm in the process of developing a pocketqube and I am currently working on the power system. I am hoping to use an SPV1040 MPPT IC to simplify the design and maximize efficiency. Each side of the ...
0
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1answer
206 views

18650 cells - Unable to measure capacity

I got many 18650 batteries from notebook batteries and I want to test their capacity by my Turnigy Accucell 8. My problem is, that when I start discharge program (0.5A what is from battery datasheet) ...
0
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1answer
190 views

Li Ion battery issue (voltage appears and disappears)

I built up a Rspberry Pi self-driving car and everything was fine while I collected data for the Neural Net. After NN finished its training, I want to test the system. At the beginning, everything was ...
0
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1answer
310 views

Connecting different lipo in series to achive high voltage

I'm not so familiar with lipo and liion but know their dangers. For my recent project I got an audio amplifier which works well on voltage of 14-18V so I need this range of voltage. My amplifier is ...
0
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1answer
4k views

LiIon tp4056 with protection, avoid drop out voltage at output

I have checked some behaviour in TP4056 boards (with protection circuit) that i don't like at all. (see schemas at the end) When you use the TP4056 module with the protección board, you will get a ...
2
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1answer
2k views

Li-Ion battery charging, termination current (ITERM)

How much does termination current (ITERM) affect the level of capacity in a Li-Ion battery? I mean, in a given capacity (say battery 3.7V 1000mAh) how much charged would a battery be when the ITERM ...
0
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1answer
273 views

Low temperature charging batteries

I was wondering what are the best rechargeable battery solutions for working in low temperature environments, ie. from -20 to -10 Celsius degrees. From what I have figured out, Li-ion batteries cannot ...
1
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2answers
58 views

Protection from fully charged battery

I want to connect a Li-Ion battery on a GSM/GPRS module expecially this one (http://www.electrodragon.com/w/GSM_GPRS_A6_Module). In general parameters is mentioned operating voltage from 3.3V to 4.2V ...
0
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1answer
52 views

High current pulses for GSM supply

I'm looking for a switching buck/boost regulator that works from a Li-Ion battery (e.g. rechargable 18650) with high efficiency and capable of providing high current pulses for GSM application. While ...