Either it will be in terms of Volt, mAh/ Ah, or Wh. To make the battery pack, you have to first finalize the nominal voltage and capacity of the pack. So I will suggest buying a hobby-grade spot welder from any online store like Banggood, Aliexpress, or eBay.I am using the SUNKKO 709A 1.9kw Spot Welderfrom Banggood. A decent hobby-grade Spot welder costs around $200 to $300, whereas a good professional grade may cost around ten times more. There are two grades of spot welders currently available in the market: hobby grade and professional grade. The reason we spot weld because it securely joins the cells together without adding much heat to them. It is better to have a good quality high wattage ( min 80W ) iron with good thermal capacity so it can deliver the heat to the joint quickly so you don't have to hold the iron to the battery for ages and let the heat seep into it, causing damage to the battery. To minimize the contact time of your soldering iron on the cell, make sure the surface is scuffed up sufficiently and you use plenty of flux to allow for fast solder flow.Ģ. Ultimately you will lose some capacity and life the cells.īut if you are not interested to buy a costly Spot Welder, you can solder the nickel tabs to the cell by following some precaution and tricks :ġ. This enhances the chemical reaction in the cell which damages the cell's performance. You should know why Spot welding is preferred over soldering, the problem with soldering is that you apply a lot of heat to the cell and it doesn’t dissipate very quickly. The best choice is always Spot welding, but Spot Welder is much costlier than a good quality Soldering Iron. You have two options two connect the 18650 cells together: 1. In this project, I have used green Panasonic 18650B cells of capacity 3400 mAh from GearBest. Another major problem with these cheap 18650 cells is the high risk of explosion when overheated during the charging or discharging. They sell the battery by marking capacity up to 5000mAh, but in actual their capacity is between 1000 to 2000 mAh. Many used batteries are rewrapped as new and white-labeled. In reality, these cells are just factory rejects, purchased by companies like Ultrafire and repackaged in their own branded cover. Reputed brand 18650 cells are generally costly, but if you consider for long time use then they are worth having it.ĭon't buy any cells with the word FIRE in the name like Ultrafire, Surefire, and Trustfire. These cells that have well-documented performance characteristics and excellent quality control. You will find many types of 18650 cells in the market in the price range of $1 to $10, but which are the best? I will highly recommend buying 18650 cells from branded companies like Panasonic, Samsung, Sanyo, and LG. Please do not attempt this if you are a novice. This tutorial was written for those who have knowledge of rechargeable lithium-ion technology. The fundamental is very simple: Just to combined the number of 18650 cells in series and parallel to make a bigger pack and finally to ensue safety adding a BMS to it.Īt the end of this project, I made a custom 3D printed enclosure for the battery pack.ĭisclaimer: I cannot be held responsible for any loss of property, damage, or loss of life if it comes to that. In this Instructable, I will show you, how to make a 18650 battery pack for applications like Power Bank, Solar Generator, e-Bike, Power wall etc. So I decided to make a light and compact 18650 Li-Ion Battery Pack. The main weight of the Solar Generator is due to the heavy lead-acid battery inside it. But the main problem is its weight, it is really heavy. AA batteries, by comparison, are sometimes called 14500 batteries because they have a 14mm diameter and 50mm height.Įarlier I have made a Solar Power Generator which is working really nice till now. It is the same shape, but a bit larger than a AA battery. The 18650 (18mm diameter and 65mm length ) battery is a size classification of lithium-ion batteries. If you enjoy my work here on Instructables, consider joining my Patreon, it will be a great help for me to make more interesting projects in the future. It is one of the most mature Li-ion formats available, is produced in high volume, and enjoys a low cost per Wh. Most of the battery packs used in Laptops, RC Toys, Drones, Medical devices, Power tools, e-bikes, and electric cars (EV) are based on 18650 batteries. In the present world, Lithium-ion is the most promising chemistry of all batteries. The world is shifting away from fossil fuels and will one day become fully electric.
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