How To Choose 18650 Cell For Lithium Battery of Electric Bicycle?

Question: I want to be a lithium battery pack for electric vehicles. I see that 18650 cells in the market have the same voltage capacity, but the price is a lot. Do not know what kind of practical, quality assurance?

It is not recommended to make electric vehicle batteries by individuals without permission, because battery assembly requires matching. The battery voltage, internal resistance and capacity should be clearly divided. The three indicators of the combined battery should not be too different. These need professional instruments and equipment to detect. In addition, the battery needs spot welding at the same time of combination, which requires spot welder and a piece of battery Appropriate battery protection board, control battery overcharge, over discharge and over-current safety settings! If there is no professional technology, never combine batteries without permission, otherwise there will be safety hazards such as battery fire and explosion.

Safe and safe!!! The primary problem of battery is safety, otherwise it is equivalent to riding on a time bomb. There are many claims abroad due to battery problems, most of which are caused by purchasing bad batteries. This part of China is relatively vague. When something goes wrong, you usually spend some money to smooth it out and delete posts. The first problem to be a battery pack is to choose a good 18650 cell. The good cell quality consistency (internal resistance) is very good, the charging and discharging performance is good, and there are no false standard parameters, and the protection function of the battery in the failure state. However, as the current several large factories Sony, LG, Panasonic and so on are all in the field of supplying automobiles, and the demand for power cells in this field is too large, resulting in insufficient capacity, and there is no additional capacity to supply general fields or small and medium-sized enterprises. As a result, the general enterprise can not get the goods at all, or the purchased electric core is renovated, or secondary products. It's OK to use a single section, which will cause many problems after concatenation. Many problems of e-bikes and balance cars are related to batteries. I suggest you have a clear understanding of battery technology before you do this.

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