We are a professional lithium battery factory in China. Now we briefly introduce how to produce lithium batteries. It starts from cathode & anode mixing, coating, baking, calendering, automatic slitting & cutting, winding, top & side sealing, electrolyte injection, pressing formation, forming, capacity grading, OCV1 & OVC2, cell to PCB, insulation and shipping. Welcome to contact and ask for the workflow table list.
Combination method: ICR18650-4S1P
Nominal voltage: 14.8V
Nominal capacity: 2200mAh
Standard continuous discharge current: 0.2C
Maximum continuous discharge current: 1C
Working temperature: charging: 0~45℃
Product size: MAX 37.8*39.1*67.7mm
Internal resistance of finished product: ≤380mΩ
Lead model: UL1007/20#, wire length 50mm
The 18650 lithium-ion battery must have a protective line to prevent the battery from being overcharged and discharged. , Of course, this is a must for lithium ion batteries, which is also a general disadvantage of lithium ion batteries, because the materials used are basic cobalt oxide lithium ion batteries, lithium and lithium cobalt oxide materials for lithium ion batteries cannot be discharged at large currents , Poor safety, from classification, classification 18650 lithium-ion batteries can be classified by the following methods.
Power batteries and energy batteries. Energy type batteries have the characteristics of high energy density and are mainly used for high energy output. Power type batteries have the characteristics of high power density and are mainly used for instantaneous high power output and output batteries. The electric lithium-ion battery is accompanied by the emergence of plug-in hybrid electric vehicles. It requires a large amount of energy stored in the battery, can support a range of pure electric drives, and has good power characteristics, entering hybrid mode when the battery is low.A simple understanding is that the energy type is similar to a marathon runner. To have endurance, it requires high capacity, and the high current discharge performance is not high; so the strength is a sprinter, and the battle is an explosion of strength, and endurance is also required, otherwise the ability is too small. can’t run far.
Lithium-ion batteries are divided into liquid lithium-ion batteries (LIB) and polymer lithium-ion batteries (PLB).Liquid lithium-ion batteries use a liquid electrolyte (currently used in power lithium batteries). Lithium-ion polymer batteries are replaced by solid polymer electrolytes, which can be either dry or colloidal, most of which are currently polymer gel electrolytes. In a solid-state battery, both the electrodes and the electrolyte are solid.
Divided into: cylinder, softback, square.Steel or aluminium housings in cylindrical and square packages. The flexible packaging packaging is aluminum-plastic film. In fact, the flexible packaging is square. The aluminum-plastic film packaging commonly used in the market is called flexible packaging, and some people call it polymer battery.
Regarding cylindrical lithium-ion batteries, the model number is usually 5 digits. The first two digits are the diameter of the battery, and the middle two digits are the height of the battery. It’s in mm. For example, an 18650 lithium-ion battery has a diameter of 18 mm and a height of 65 mm.
Cathode materials: Lithium Iron Phosphate (LFP), Lithium Cobalt Oxide (LCO), Lithium Manganese Oxide (LMO), (Binary Battery: Lithium Nickel Oxide / Lithium Nickel Nickel Oxide), (ternary Battery: Nickel oxide nickel manganese lithium-ion battery (NCM), nickel aluminate lithium-ion battery (NCA)).
Causes: a. Welding of negative electrode and tab; b. Welding of positive electrode and tab; c. Welding of positive electrode and cap; d. Welding of negative electrode and shell; e. Large contact resistance between rivet and pressure plate ; f. No conductive agent is added to the positive electrode; g. There is no lithium salt in the electrolyte; h. The battery has been short-circuited; i. The porosity of the separator paper is small.
Causes: a. Side reactions (decomposition of electrolyte; impurities in the positive electrode; water); b. Not well-formed (SEI film is not formed safely); c. Customer’s circuit board leakage (referring to the battery cells returned by the customer after processing ); d. The customer did not spot welding as required (cells processed by the customer); e. Burrs; f. Micro-short circuit; g. The negative electrode produces dendrites.
a. Weld leakage; b. Electrolyte decomposition; c. Undrying moisture; d. Poor sealing performance of cap; e. Shell wall too thick; f. Shell too thick; g. ; pole pieces not compacted; diaphragm too thick).
a. The sub-container is faulty (causing overcharge); b. The diaphragm closure effect is poor; c. Internal short circuit.
a. Material dust; b. Broken when packing; c. Scraping (diaphragm paper is too small or not properly padded); d. Uneven winding; e. Not well wrapped; f. Diaphragm has holes; g. Burrs
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