Charging ultra-thin 1mm x 6mm x 45mm lithium battery in space-limited designs

Hi Guys,


Soon i will start prototyping with a small, flat, flexible rechargeable lithium battery.
I am no engineer at all but since my product will be very straight forward i really want to learn the things i need to know.
That's why i am here with my question. I need a solution to charge this battery but i honestly have no idea what to take in mind. Does charging need any type of controller?
I have very, very limited space in my product. The battery itself will be 1mm thick, 6mm width and 45mm length. As for charging i need a very small solution. Things like a mini usb charging port wouldn't even fit.
Do you guys have any advice on where to look for information like this?


Thanks!

You can get very small Lithium battery charger boards that work off a USB connection.Here's a small cheap one I found on EBay.  Google "Lithium battery charger board" for more.Edit - here's another one from AdafruitFor anything to do with batteries, Battery University is always my first port of call.Their basic article on chagine Li-Ion batteries is here, but they have other information as well, look at the index down the left hand side or search up the top.  their document BU-216 gives an overview of the various types of Li batteries.

These comments apply similarly to lithium particle and lithium polymer batteries. The science is fundamentally the equivalent for the two kinds of batteries, so charging strategies for lithium polymer batteries can be utilized for lithium-particle batteries. Charging lithium press phosphate 3.2 volt cells is indistinguishable, yet the steady voltage stage is constrained to 3.65 volts. The lithium particle battery is anything but difficult to charge. Charging securely is a more troublesome. The essential calculation is to charge at steady current (0.2 C to 0.7 C relying upon maker) until the point when the battery achieves 4.2 Vpc (volts per cell), and hold the voltage at 4.2 volts until the point that the charge current has dropped to 10% of the underlying charge rate. The end condition is the drop in control current to 10%. The best charging voltage and the end current fluctuates somewhat with the producer electrical engineer.
In any case, a charge clock ought to be incorporated for security.
The charge can't be ended on a voltage. The limit came to at 4.2 Volts per cell is just 40 to 70% of full limit except if charged gradually. Therefore you have to keep on charging until the current drops, and to end on the low current.
Note that stream charging isn't adequate for lithium batteries. The Li-particle science can't acknowledge a cheat without making harm the cell, conceivably plating out lithium metal and getting to be unsafe.
Buoy charging, nonetheless, is a helpful choice. The security issue with keeping the battery on steady charge is that if the charger ought to by one way or another go haywire and apply a higher voltage there could be issues. Also, so the rationale goes, the shorter the charger is turned on the more outlandish the charge will go haywire while associated with the battery. Nonetheless, there is another security strategy, the battery insurance board, which ought to be incorporated either on the battery or in other hardware between the battery and the charger. The BPB (otherwise called PCB for "security circuit board") or other battery the board circuit will stop the charge if the voltage gets too high.
The inquiry every so often comes up "What is the impact of accusing of under 4.2 volts?" Not at all like other battery sciences the battery will charge, however it will never achieve full charge, it might be incompletely charged. The purpose behind this is stuffing the particles into the anode or cathode precious stones requires more voltage than the straightforward electrochemical cell voltage. The higher the voltage the more particles can be embedded. The page connected here contains our examination and some quantitative information on the general limit of lithium-particle batteries that are charged beneath 4.2 volts. Leeway to charging at lower voltages is that the cycle life goes up drastically.
Charging Lithium particle batteries at moderate rates
At the point when the charge rate amid the consistent current stage is low, the charger procedure will invest less energy amid the steady voltage tail. On the off chance that you charge underneath about 0.18 C, the cell is essentially full when the 4.2 volts is come to. This can be utilized as an elective charge calculation. Simply charge underneath 0.18C consistent current and end the charge when the voltage achieves 4.2 volts per cell.
Wellbeing
Each lithium particle battery pack ought to have a strategy for keeping the cell adjusted and keeping them from being over-released. This is normally finished with a wellbeing board which screens the charge and release of the pack, and keeps perilous things from occurring. The particulars of these wellbeing sheets are managed by the cell produce, and may incorporate the accompanying:
Turn around extremity security
Charge temperature- - must not be charged when temperature is lower than 0° C or above 45° C.
Charge current must not be too high, commonly underneath 0.7 C.
Release current assurance to avert harm because of shortcircuits.
Charge voltage- - a lasting circuit opens if an excessive amount of voltage is connected to the battery terminals
Cheat insurance - stops charge when voltage per cell transcends 4.30 volts.
Overdischarge security - stops release when battery voltage falls beneath 2.3 volts per cell (shifts with producer).
A wire opens if the battery is ever presented to temperatures above 100° C.

The charging circuit of the lithium batteries is straightforward. Voltage and current are easy to accommodate to analyzing the complex voltage signature and it will change the as the battery age also can visit Asus laptop battery replacement for more information in details.

When the charge rate during the constant current phase is low, the charger process will spend less time during the constant voltage tail. If you charge below about 0.18 C, the cell is virtually full when the 4.2 volts is reached. This can be used as an alternative charge algorithm. Just charge below 0.18C constant current and terminate the charge when the voltage reaches 4.2 volts per cell.
Every lithium ion battery pack should have a method of keeping the cell balanced and preventing them from being over-discharged. This is usually done with a safety board which monitors the charge and discharge of the pack, and prevents dangerous things from happening. The specifications of these safety boards are dictated by the cell manufacture, and may include the following:Reverse polarity protectionCharge temperature--must not be charged when temperature is lower than 0° C or above 45° C.Charge current must not be too high, typically below 0.7 C.Discharge current protection to prevent damage due to short circuits.Charge voltage--a permanent fuse opens if too much voltage is applied to the battery terminalsOvercharge protection--stops charge when voltage per cell rises above 4.30 volts.Over discharge protection--stops discharge when battery voltage falls below 2.3 volts per cell (varies with manufacturer).A fuse opens if the battery is ever exposed to temperatures above 100° C.

Turn off the device or disconnect the load on a charge to allow the current to drop unhindered during saturation.Charge at a moderate temperature. Lithium-ion does not need to be fully charged; a partial charge is better.