Questions tagged [lithium-ion]

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

Filter by
Sorted by
Tagged with
0
votes
3answers
130 views

How to use a gas gauge?

I must have missed an article, lesson at uni, or something obvious because I'm struggling to work out how to write some firmware to use a gas gauge to get out a rough percentage of battery remaining, ...
0
votes
3answers
57 views

Dual N-channel mosfet Rdson value

I'm going though datasheets of some dual N-channel MOSFETs for li-ion battery protection, like 8205A or ECH8695R, for some thermal and power dissipation calculations. There are Rds(on) values, like ...
0
votes
0answers
60 views

Current and voltage increasing with duty cycle from buck- converter

I am designing a 2s Li-ion battery charger using a buck converter from a 10W (18V, 0.55A) solar panel. So I understand that the duty cycle controls the ratio of the input power vs output power and ...
0
votes
1answer
31 views

Under-voltage lockout programming on Delta D12F200 DC/DC converter

I recently decided on the Delta D12F200 DC/DC converter for my current project (datasheet: https://www.mouser.com/datasheet/2/632/DS_D12F200-1141659.pdf). My project will be powered by lithium ion ...
0
votes
3answers
69 views

Balanced Charging of ZOP 2s lithium ion battery

Good day everyone, I recently purchased a “ZOP Power 7.4V 2200mAh 2S 35C Lipo Battery T Plug” for a project. I have designed a circuit to charge the battery, but now I am wondering if it is necessary ...
0
votes
0answers
107 views

Short circuit protection of lithium pouch cells in parallel

I want to put together a battery pack with 2 or 3 lithium pouch cells (for example SLPB11543140H5) in parallel, and a few more in series. Of course they have to have some kind of short circuit ...
0
votes
2answers
180 views

LTC4054 Odd behaviour

I have included a LTC4054 IC in my project and here is how the circuit is. I purchased it from here The schematic is uploaded on github. The chip has 5 pins Pin 1 CHRG- connected in series to a ...
0
votes
1answer
139 views

Switching between two completely independent circuits

Background: I have built a 2S 7.4V battery out of two 18650 batteries. I have some TP4056 (5V 1A Micro-USB) charging modules lying around. I would like to use these the TP4056 modules (one per 18650) ...
0
votes
1answer
339 views

Converting a 9.6V NiCad Drill to Li-on [closed]

I am trying to convert my 9.6V NiCad drill to run off a 12V Li-on battery. When I connect the Li-On directly, the motor only just slightly spins and stops. The only way I can get it to work is using a ...
1
vote
1answer
125 views

Does a lithium battery make a good ground plane?

A patch antenna I'm using calls for a 50mm x 50mm ground plane under it, mostly to cut multipath reflections in the bottom lobe. Naturally, the closer to the antenna and the more conductive the ground ...
0
votes
1answer
40 views

li-ion battery managment system, cell protection difference?

Could you help me to clear up what the battery management system/BMS adds to cell level protection, what is the difference? I assume that if I have many cells in series if I only have cell protection ...
0
votes
0answers
104 views

AC water turbine

I am trying to use a water turbine from China to charge a lithium ion battery. The water turbine is rated to 10 watts. I figured that should be enough to charge the battery but I can only ever get ...
1
vote
2answers
209 views

Buck converter for Li-Ion 2s battery charger

I'm currently doing a project that requires the charging of a 2s Li-Ion battery. I have an 18V 10W solar panel that I want to charge my battery using a buck converter. Im controlling the switch and ...
0
votes
3answers
137 views

Why doesn't the voltage drop across the resistors of my battery charger follow Ohm's law?

Here's the setup, the three items below are in series: Battery at 215V Power supply at 250V (It is a 5A constant current power supply that will drop voltage down to 200V minimum before failing) 8 ...
0
votes
1answer
109 views

1S or 2S li-ion battery charging design for ESP32/Nextion device

I am designing a portable battery powered device and trying to decide on my battery configuration. It will use an ESP32 chip with a few additional ICs, which will draw about as much current as an ...
0
votes
0answers
142 views

Seperate protection circuit for charger and system for Li-ion battery

I'm thinking of using the BQ2971x for battery protection. http://www.ti.com/lit/ds/symlink/bq2971.pdf One thing that anoys me is that most batterys (18650 Li-ions) usually have a lot higher ...
1
vote
2answers
69 views

How to protect Li-Ion battery from a defibrillator pulse

I'm working on a design where the rechargeable Li-Ion battery is placed closely (attached with a magnetic connector) to a body-worn contact. The concern is that in an event of a defibrillation, the ...
1
vote
0answers
113 views

help building 6S2P balanced Li-Ion battery pack

I'm trying to build a 6S2P balanced Li-Ion battery pack for a quadcopter using LG 18650 HG2 cells with pre-soldered nickel strips (1st image) so that I won't solder directly on the cell's terminals. ...
2
votes
0answers
219 views

TP4056 with DW01, can I use a diode to create an “UPS”? Design review

I'm studying lithium cells and their related mainstream modules. One of the most common -yet wrong- use of the TP4056 module is to use it with the USB 5V input and an active load on the output (at ...
1
vote
2answers
74 views

Should series connected battery cells have similar internal resistance and to what degree?

I have some Toshiba SCiB cells that I wish to string in 4s configuration. These are Lithium Titanate (LTO) cells. They have a 20Ah capacity and operate safely between 1.5 V and 2.7 V. The cells were ...
1
vote
2answers
653 views

Should I add insulation to lithium ion battery

I have purchased a 36v 10ah lithium ion battery for use with an electric bike. I live in rural Australia where it gets very hot in summer and fairly cold in winter. I considered insulating the ...
2
votes
1answer
662 views

Can I make endless parallel li-ion connections?

I'm looking into building my own li-ion battery pack. I read about linking the cells in parallel and in series, and how to add a BMS. I would like to build a 12V pack with a very large capacity (mAh)....
1
vote
2answers
990 views

Li Ion CC-CV Charger needed for standard protection board? [closed]

I am currently designign a 4S2P Li-Ion battery pack. The cells I use are unprotected, so I want to use one of those BMS/Protection/Balance boards like this: https://www.ebay.de/itm/4S-40A-16-8V-40A-...
1
vote
0answers
68 views

Usability of a deeply discharged Li-ion batteries

I have a question about Li-ion batteries. About three years back I bought two Sony VTC 5 batteries for my vape. They are rated as 2500 mAh 30 A. But I quit smoking about a year ago and I left these ...
2
votes
2answers
93 views

Clear cut thing to do when 18650 Li Ion Cell Has Been Overdischarged

I think close to everyone knows over-discharge of Lithium ion cells is bad news, creating fire and chemical burn hazards. These are my cells I accidentally over-discharged two Lithium Ion cells. ...
1
vote
1answer
296 views

Is charging 18650 lithium ion cells with lower current better? [duplicate]

I have a 3p12s 18650 Li-ion battery pack that I use for my e-bike. I charge it with a balance charger. I know that charging with too high current is bad for battery life. But is it "the lower the ...
2
votes
1answer
711 views

What is the minimum charging current for NCR18650 li ion battery? [duplicate]

I need a rechargeable battery pack for my project, I need to know what is the minimum charging current for NCR18650 li-ion battery? In the datasheet, it says max charge current is 2A. what is the ...
2
votes
3answers
1k 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 ...
0
votes
1answer
292 views

De-soldering and Re-soldering Lithium battery to PCB

Ive got a Lutron Homeworks 4 Processor that is c. 15 years old, it has failed where there has been a power outage to the processor and the lithium battery on the PCB has not been able to provide power ...
0
votes
1answer
145 views

Can I charge this li-ion battery with this solar panel setup? [closed]

Since a couple years I've been messing around with a raspi and some motors. Building random stuff with dc-motors and such. I now want to power a self driving boat-robot with some solar power. For this ...
2
votes
2answers
67 views

I cannot se how the device is a buck charger when charging and a boost on the output

I cannot se how the device is a buck charger when charging and a boost on the output. Am I stupid or is the datasheet wrong? "5A Single Cell Li-Ion Switching Battery Charger with Direct Charge, Power ...
1
vote
1answer
25 views

Electron transfer and thermal efficiency in series vs single battery?

If you have 10 batteries in series all generating 5W, does every battery in the series have the same temperature as a single battery drawing 5W? I have trouble visualizing how the electrons travel ...
2
votes
0answers
131 views

Sense resistors in system-side Li-Ion charger/gauge circuit

I'm working on designing a charger and fuel gauge circuit for a premade 3S3P Li-Ion battery pack. The battery pack has basic protection circuits onborad (over/undervoltage and a PTC) and only the pack ...
0
votes
1answer
69 views

Theoretical rechargeable battery capacity question

I have very little energy usage/storage knowledge but my question will hopefully prove to be a simple one. If I have a 120 volt appliance that uses roughly 0.50 kWh a day and 600 watts at peak draw, ...
4
votes
1answer
75 views

Considering lithium-ion variant when picking a BMS board

I have 4 Panasonic NCR18650B batteries and want to purchase a BMS to charge them in series. The following board looks promising, but I'm not sure if it's fully compatible with my batteries. The main ...
2
votes
1answer
639 views

Actual lifetime of 18650 cells

For a project, we are currently looking at how long we could use battery cells, such as the LG 18650MJ1 at maximum discharge and maximum charge in 25°C ambient temperatures. Basically, in this case, ...
1
vote
0answers
266 views

Li-ion 3s Battery Charger with Load Sharing

I am requesting help to create a battery charger and load sharing circuit with the following specifications: 3s Lithium Ion battery 12 V at 2 Amps to power TPA3128D2 Class-D Amplifier (this is for ...
2
votes
2answers
78 views

Smart charger - how to detect current and voltage of different battery packs and then charge them accordingly [closed]

I am thinking of designing a smart charger for a few of my bikes/scooters, etc detects current and voltage of the pack (30-60V, 1-5A) charges the pack accordingly in the CC-CV mode, fast-charging ...
0
votes
1answer
452 views

Connect multiple 3.7 V Lithium-ion Polymer Battery in parallel [duplicate]

If I connect 2 1000mAh battery in parallel would I get 2000mAh over 3.7V? https://www.aliexpress.com/item/1000mAh-3-7-V-Lithium-ion-Polymer-Battery-102050-For-MP3-MP4-MP5-GPS-KTV-Household/...
2
votes
2answers
138 views

Buck/Boost converter interaction with MCU in sleep mode?

I am trying to design a battery powered remote controller that has the following components, TPS63802 (converter), AP9211 (battery charger/protection), Atmega328 (MCU), NRF24 (transceiver). The ...
2
votes
4answers
268 views

LiPo Voltage Drops

I am experiencing voltage drops with the following setup and I hope someone with mad electronics skills can explain my mistake to me: Raspberry Pi 3 Model B TFP401 Display Driver 7.0 Inch TFT Display ...
-1
votes
1answer
57 views

Does battery wear depend more on EMF voltage (capacity) or terminal voltage? (charging full slowly vs. charging fast)

Let's say there are two identical Lithium-Ion batteries. (is it any different for Ni-MH batteries?) One gets charged at 0.1C until the EMF voltage (which is capacity-dependent) reaches 4.3V. The ...
0
votes
2answers
74 views

How to check protection circuit in lithium battery

I've recently bought a single cell, 600 mAh lithium battery (like this one) and a TP4056 battery charger module, which I intended to use with the battery. The charger has an integrated protection ...
0
votes
1answer
747 views

How to charge lithium ion batteries - BMS (and) TP4056

I have this BMS module for 3 cell lithium ion battery protection. as this guy explain the BMS modules can charge the batteries but not ideally, so we need a separate charger module to fully charge the ...
3
votes
1answer
413 views

How does one charge a 37-volt lithium battery? [closed]

I have removed a 37-volt lithium ion battery from a self-balancing scooter for a robotics project. I retained the PCBs of the device for charging the battery. Unfortunately, the electronics appear to ...
1
vote
3answers
367 views

Lithium-ion battery charger circuit design [closed]

For my project I need to charge a 2s, 7.4V LiPo battery pack from an 18V 10W solar panel. This would not be an issue if I was able to use ICs such as the BQ2057WTS, but I am required to do design a ...
0
votes
0answers
44 views

Li-ion cell voltage balancing issue while charging

I have a two cell li-ion battery which has specifications of 7.4v, 2200mAH. I used one cell (3.7v, 2200mAH) for a required project. I discharged it and then reconfigured in to series(7.4v, 2200mAH) ...
5
votes
1answer
455 views

What is the typical RMS noise of a lithium battery?

Take a typical CR2032 battery, if it is not discharging, what is the typical variation in voltage over a short period of time (eg a few seconds or minutes)?
1
vote
1answer
83 views

Why did my LiPoly Charger fail when I connected my cell

After having burned a small hole in my finger, I'm trying to figure out why exactly the Micro-Lipo charger heated up instantly. I am using the Adafruit Micro-Lipo charger which has the following ...
1
vote
1answer
1k views

Adding Current limit for DIY DC-DC converter (CC/CV battery charging)

I was following the circuitry by great Scott for the DIY buck converter here: https://www.youtube.com/watch?v=m8rK9gU30v4 . Created a converter that gives 0-23V on 24V supply. After this i wanted to ...

1
3 4
5
6 7
19