Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [lithium-ion]

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

2
votes
0answers
16 views

Context of Li-Ion MnO2 “Cell Configuration” Specification

My application supports variable pack configurations: 4S4P, 4S6P and 4S8P. Each one obviously uses a different BMS profile, and other minor changes such as charge/discharge MOSFET and fuse selections....
2
votes
0answers
63 views

How can I size the current ripple of a DC-DC converter for lithium batteries

I am designing a bidirectional DC-DC converter to charge and discharge batteries on a DC bus. The power of this converter is 50 kW and the average current in the inductor (the same as that on the ...
2
votes
0answers
66 views

Should I be conservative about setting the output voltage of the CV phase of Li-Ion charging

Background My application features a Li-Ion battery (NCR18650B) which I'm charging with the standard CC/CV method. Various constraints force me to use a generic buck converter (with current limiter) ...
2
votes
0answers
200 views

Transzorb for MCP73831 USB LiIon Charger?

The datasheet of MCP73831 (a small LiIon charger device) recommends a transzorb on the USB power input (VDD) for input over voltage protection. See Section 6.1.1.2. Absolute maximum ratings for VDD ...
1
vote
0answers
32 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 ...
1
vote
0answers
74 views

Capacitive discharge excess being used for battery recharging

I am currently designing a circuit similar to a cattle prod that is intended to be attached to a drone. The cattle prod is powered by a lithium-ion battery, charging up a capacitor and then quickly ...
1
vote
0answers
33 views

Motorcycle LiFePO 4 / Super capacitor 24v hybrid possibilities?

First please let me apologise, I’m quite frankly a complete newbie to electronics and come from a strictly design background. However, I'm really interested in learning and understanding electronics ...
1
vote
0answers
39 views

Intrinsically Safe Li-Pol batteries to 60079 standards

I have recently been looking at SAFT batteries and they have a range of Li-Ion batteries, such as the MP-144350. One advantage quoted is "High level of safety, compatible in potentially explosive ...
1
vote
0answers
227 views

Li-ion charging circuit

I have a project that I want to power with a single cell lithium ion battery, which is to be charged from a USB plug (but not from a laptop or computer, rather from a wall supply like a phone charger)....
1
vote
0answers
40 views

How does non-ideal charging affect the life of a Li-Ion/Li-Po battery?

For lithium ion batteries, the standard way of charging them is CC - CV - cutoff. My question is, what are the effects of not following this pattern? For example, what if you charge with just a ...
1
vote
0answers
32 views

Can lipo and Lithium-ion batteries be used together?

Lithium ion batteries have high specific energy and lipo have high c rating (high power). Is it possible to put lipo and lithium-ion batteries in parallel if they are at the same voltage and ...
1
vote
0answers
330 views

Li-Ion battery modification to charge with Ni-MH charger

First of all, I have to say I know "Li-Ion batteries can not charge with NiMH charging". So this question about li-Ion battery modification. 1. I found a battery from China that consists of 2 serial ...
1
vote
0answers
108 views

Self-charging robot safety considerations

I have made a 3S5P (18650 Sanyo NCR18650GA 3500mAh with 10A discharge rate) battery pack (about 220 watt hours when fully charged) for a robot. I'm using a BMS with balance (supports up to 60A ...
1
vote
0answers
399 views

SIM800l power-up problems

The datasheet of the SIM800l claims that currents can peak to around 2A during SIM registration and other network intensive activities. I tried powering up the module with the 5v output of a FTDI-USB ...
1
vote
0answers
371 views

ESP + Lithium Battery Potting

I'm designing a monitoring system for plants based on a lithium-ion battery and an ESP8266 (Adafruit Huzzah board). Due to the application, water may come in contact with the battery and/or ...
1
vote
0answers
231 views

Li-ion BMS/PCM Use Cases

I am building a portable bluetooth speaker. I am using 4 18650 Li-Ion batteries and using 4S 14.8v BMS/PCM charge/discharge protection board with balancing. This board works great, but the challenge ...
1
vote
0answers
298 views

Servo Regenerative Braking and Li-Ion Battery

I would like to power two of HSB-9370TH with one or two of these 7.4V Li-Ion Battery in parallel. I notice that the HSB-9370TH has regenerative braking, and my current application will have constant ...
1
vote
0answers
780 views

Using a Ryobi 36v battery to power an electric kart

I'm attempting to use a [BPL3650][1] 36v Ryobi battery as the power source for replica electric willy's jeeps I've constructed for my kids. The batteries charge fine in the standard chargers ...
1
vote
0answers
144 views

Pow Management IC: Li-Ion 2.8 - 4.2V; Sys Volts: 3.3V

I am designing a consumer Li-ion powered system with the following constraints: The system volts has to be 3.3V Li-Ion battery charging range is 2.8 - 4.2V Charging is to be done via a standard USB ...
1
vote
0answers
462 views

Measuring a 2 cell 18650 battery from ATMega328P

I'm using an ATMega 328P (which will be running arduino code) as part of a project (a bicycle lighting system). It runs off of 2 Li-Ion cells, which both are step-up-regulated to 12V for the lighting, ...
0
votes
0answers
24 views

Connecting 2 li-ion battery packs

I have an electric scooter that takes a 60v li-ion battery,can I connect 2 identical batteries together to get longer run time ?
0
votes
0answers
40 views

“lithium for buffered usage in UPS”, or floating-charge lithium accumulator

For lead acid there are typically two paradigms of charging (or use-scenarios). First one is deep cycles, when you exaust 40-60% of capacity (not less than 12.4V), then charge it to 14.4 with ...
0
votes
0answers
39 views

How to charge Lithium Ion with protection circuitry

I am trying to build a charger for the Ctr 003 battery for the Nintendo DS. This battery has 3 outputs, which I call +, 0, and - for simplicity. When I measure voltage from + to -, or from + to 0, I ...
0
votes
0answers
33 views

Understanding MOSFETs Driven by Analog vs. Digital Signal

I plan to run a circuit with two 18650s in parallel to get 7Ah of capacity and a 3.3V rail (for running the ESP32 MCU). I'll use an LDO to get my 3.3V until the battery voltage drops to 3.3V. At that ...
0
votes
0answers
104 views

What is the blue wire for on my battery? (samsung galaxy note 10.1)

I have this battery out of a Samsung Galaxy Note 10.1 and this battery has 5 wires; 2 black, 2 red and 1 blue wire. I assume that the red wires are positive and the black wire negative charge. I've ...
0
votes
0answers
46 views

What is this “Termination Disable” pin?

I'm just looking at the BQ2407x range of Lithium-Ion charging ICs. One part in the range has an extra pin, TD, which disables/enables "charge termination". Here is the functionality description: ...
0
votes
0answers
32 views

1W*3 3W*1 Power LED Driver Circuit Power Management

I'm trying to interface 4 Power LEDs to be driven by a 3400mAh Li-Ion Battery by using 5 AMC7135. To control the battery I've hooked up TI's BQ25606 as Power Management whose input will be from a 12V ...
0
votes
0answers
19 views

Dedicated li-ion step up drivers

I have a design which will include the optional use case of boosting up to 7V from a li-ion battery. I can't seem to find any drivers dedicated to li-ion for this? There seem to be a few buck boost ...
0
votes
0answers
55 views

Li-ion battery and arduinos custom circuitry

So i have to design a board around a dialog SOC (DA14681). The dialog part supports li-ion batteries, it has a charger and fuel gauge and USB detection (to power device in case both usb and dc ...
0
votes
0answers
100 views

BQ24133, unable to charge the battery

I have designed the circuit around BQ24133 and in my humble opinion, chose the right components while following the datasheet. I had the PCB made, soldered the components and started testing. The next ...
0
votes
0answers
50 views

lithium ion battery capacity loss across different storage charge levels over time

We can see this simple chart in many places, however I am curious to know how the numbers work out for different starting charge levels than 40% (3.8V, ish? for li-ion). For example, how much worse ...
0
votes
0answers
35 views

How to lower voltage on condition

I have 16.4V out of a 4S4P Li-ion battery pack when fully charged, even if the voltage drops quickly when using it, my device can't take above 16V. So I need the output to be always below 16V, is ...
0
votes
0answers
51 views

12V Converter for li ion battery pack supporting 16-20 Amps

I built a 4S Li ion battery pack and I need 12V output at 16-20Amps but I have limited space (70mmx55mm). 12 V would be the best but I could also just reduce the max output from 16.8V (4x4.2V) to ...
0
votes
0answers
82 views

Master switch placement for Li-ion charging circuit MCP73871

I am designing my first Li-ion charging circuit, based on the Adafruit Powerboost 1000C, and this is what I have so far: I am probably going to also add a way to read the battery voltage based on ...
0
votes
0answers
227 views

Is this a temp sensor on my battery pack?

I am trying to modify a battery pack for a Ridgid nailgun to use replaceable 18650 Li-ion batteries. The original pack looks like this: I've printed an adapter which holds 5 cells and wires to the ...
0
votes
0answers
61 views

Is the mobile charger capable of charging an SLA?

The referenced article over on http://www.instructables.com/id/4V-Lead-Acid-Battery-Charger/ indicates a Li Ion charger for mobile phones may serve to charge a low AH SLA. I held the impression a Li ...
0
votes
0answers
56 views

Query on Li-ion battery charging/protection IC

I have drawn a LI-ION battery charging circuitry for LED lamp application. I used the IC’s DWO1A for 1 cell lithium ion battery protection and 8205 for dual N Channel enhancement MOSFET. Since ...
0
votes
0answers
83 views

How to connect 2 thermistors for battery protection?

I'm planning to use BQ24100 for charging Li-ion cells connected in parallel. Unfortunately, the cells have to be separated by few centimeters, so I have to use 2 thermistors. So, how to connect 2 ...
0
votes
0answers
45 views

How to safely and fast charge 2 Li-ion cells connected in parallel?

I want to charge 2 Li-ion cells. They are connected in parallel and they are from the same manufacturer (Samsung) and seller. I'd like the charging to be safe and reasonably fast - my cells are 3500 ...
0
votes
0answers
132 views

MPPT charge control Project - LT3652

I am doing a Solar powered power bank as my dissertation project. It's based on LT3652 charge control, a Lithium-Ion battery (4500mAh) and 2 boost converters (3.3-5V and 3.3-12V). I am using a 21W, ...
0
votes
0answers
423 views

Integrating Li-ion charging & protection on the same PCB, how to wire/ground properly?

I'm designing my first PCB in which I'd like to include a battery charging IC as well as a protection IC, with a focus on small footprint and low BOM. The trifecta that I came across quite often was ...
0
votes
0answers
74 views

Increasing the number of parallel cells for batteries

I am using BQ20Z655-R1 for a lithium ion battery which is in the 4Serial-3Parallel cell configuration. In addition, I don't use LED or LCD in this lithium-ion battery. My cells have 3500mAh capacity. ...
0
votes
0answers
152 views

Why would a 5s BMS lower to output voltage of my battery?

I have 10 lithium ion cells, linked first in parallel sets of two and then 5 in series with an 18-24v 40amp Max BMS unit, each cell is registering @ 4v individually but only reading 16v with the BMS. ...
0
votes
0answers
72 views

Weird Li-Ion parallel issue - are the protection boards fighting each other?

So I have a very strange issue I need help with. It has to do with connecting 2 of these in parallel: They have a protection board for each of them, the DW01-P and a dual FET. The boards in this ...
0
votes
0answers
41 views

UPS VA vs battery current drain

My UPS is dead, or more correctly speaking, its battery is dead. I want to make a lithium battery pack to replace it instead of buying a new lead acid battery for it. Here are few questions: 1, it's ...
0
votes
0answers
57 views

Charging two lithium ion batteries in series connection individually

Any idea to charge two lithium ion batteries which are connected in series each one gives out 3.7 volts (both to give out 7.4 volts) individually? What's the main idea or circuitry to do the task ? I ...
0
votes
0answers
323 views

Can i use a separate Balace board with a BMS?

I have a CF-6S12A BMS board that does not have balance...Is it possible to use a hx-jh-008 board for balancing the pack? and to charge it i wondered if it's possible to charge the pack with a 22V 2.7A ...
0
votes
0answers
219 views

17670 lithium ion cells

I took apart a very old laptop and the cells I found inside the battery were 17670 (the full name is SF US17670GR). I was planning on using them for a DIY power bank from aliexpress, but the industry ...
0
votes
0answers
178 views

3.7V to 5.2V 2A DC/DC converter

I need a circuit that can constantly provide 5.2V 2A from a single Li-Ion cell. I looked for boost converters already, but I struggled to find one that fits my needs (most can't deliver 2A constantly ...
0
votes
0answers
133 views

Lithium polymer/ion battery in parallel

Is it possible to put Lipo/Li-ion batteries of different capacities in parallel? I am aware that putting anything different in series/parallel isn't the best option, but design limitations do not ...