18650 is the originator of lithium-ion batteries – a standard lithium-ion battery model set by Japan’s SONY company in order to save costs, where 18 indicates a diameter of 18mm, 65 indicates a length of 65mm, and 0 indicates a cylindrical battery.
The 18650 battery lifespan theory is 500 cycles of charging. Due to the large capacity per unit density, most of them are used in notebook computer batteries. In addition, because 18650 has very good stability at work, it is widely used in major electronic fields: commonly used in high-end strong light flashlights, portable Power supplies, wireless data transmitters, electric thermal clothing, shoes, portable instruments, portable lighting equipment, portable printers, industrial instruments, medical instruments, etc.
Standard charging method: charge with 0.2C5 constant current until the battery terminal voltage is 4.20V, change to constant voltage charging, and when the charging current is less than 0.01C5, it is regarded as fully charged.
The standard charging method is often used for the calibration of battery capacity. Because the charging is too slow, it is rarely used in daily use.
Fast charging method: charge with 1C5 constant current until the battery terminal voltage is 4.20V, change to constant current charging, until the charging current is less than 0.01C.
Notes on the fast charging method:
The initial charging current should not be too large to avoid overheating of the battery, leakage and bursting.
When the battery terminal voltage reaches 4.20V, it must be switched to constant voltage immediately. The voltage requirement is relatively high (error <0.5%), and it must be measured with a multimeter with more than four and a half digits.
18650 battery packs are commonly used in a broad spectrum of applications, including:
Energy storage. Mainly used in base station power supply, clean energy storage, grid power storage, home solar storage system, etc.
Power class. Mainly refers to electric vehicles, electric bicycles, new energy vehicles, etc.
Digital consumer electronics. Mobile phones, tablets, laptops, electric toys, MP3/MP4, earphones, power banks, model airplanes, power banks, etc.
First of all, make a simple calculation according to the requirements of the battery pack for capacity and voltage, determine the capacity in parallel, and solve the voltage in series.
2. Connection method
Since the lithium battery is strictly prohibited from overcharging and over-discharging, a protection board should be added. This determines that the battery pack must be connected in a parallel-to-serial mode. That is, connect 15 cells in parallel and then in series. This connection method has high requirements on the consistency of the cells, so it is necessary to do some classification and pairing work. That is, the internal resistance should be connected in parallel with the same or close resistance as possible.
3. Protection board connection
Lithium battery protection boards are now sold online with many finished products. Connect the battery and the protection board as shown below.
It includes the whole 14 steps to whole lithium battery packs. It includes cell inspection & test, solder PCB/nickel strip/cell, highland barley paper insulation, aging test, packing and delivery.
The battery should be stored at room temperature, and charged to 40%~60% electric quantity.
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