Lithium Battery Knowledge

Lithium-ion polymer batteries are widely used due to their long life and high capacity. However, there are some issues that can arise, such as swelling, unsatisfactory safety performance, and accelerated cycle life attenuation.

Lithium polymer battery ( Li-polymer battery ), is a chemical battery. Compared with the previous battery, it has the characteristics of high energy, miniaturization and light weight. Lithium polymer batteries have ultra-thin features, and can be made into batteries of different shapes and capacities to meet the needs of some products. The theoretical minimum thickness can reach 0.5mm.

Since the lithium-ion battery entered the market, it has been widely used due to its advantages such as long life, large specific capacity and no memory effect. Low-temperature use of lithium-ion batteries has problems such as low capacity, severe attenuation, poor cycle rate performance, obvious lithium evolution, and unbalanced lithium extraction. However, with the continuous expansion of application areas, the restrictions brought by the low-temperature performance of lithium-ion batteries have become more and more obvious.

Safety comparison of lithium cobaltate, lithium iron phosphate and polymer lithium batteries. Many customers have a lot of disputes about the safety performance of lithium batteries. Compared with lithium cobalt oxide batteries and polymer lithium batteries, the most obvious advantage of lithium iron phosphate batteries is the extremely high safety factor and support for fast charging (high current charging). And a wider operating temperature range.

The use of lithium batteries is restricted in low temperature environments. Except for the severe deterioration of discharge capacity, lithium batteries cannot be charged at low temperatures. During low-temperature charging, the intercalation of lithium ions on the graphite electrode of the battery and the lithium plating reaction coexist and compete with each other. Under low temperature conditions, the diffusion of lithium ions in graphite is inhibited, and the conductivity of the electrolyte decreases, resulting in a decrease in the intercalation rate and the lithium plating reaction on the graphite surface is more likely to occur. The main reasons for the decrease in the life of lithium-ion batteries when used at low temperatures are the increase in internal impedance and the degradation of the capacity due to the precipitation of lithium ions.

There may be two basic reasons for the expansion of lithium-ion batteries. The first reason is the level of production technology of polymer lithium-ion batteries: the metal electrode coating is not uniform and the processing technology is relatively rough. Another reason may be the problem of overcharging and overdischarging.

A high-rate battery means that the battery can be discharged at a high current. The high-rate charge-discharge performance of a lithium battery is closely related to the migration ability of lithium ions at the electrode, electrolyte and their interface. All factors affecting the migration speed of lithium ions will definitely affect the high rate of the battery Charge and discharge performance.

Cordless vacuum cleaners generally use power lithium-ion batteries, which are composed of several 18650 lithium-ion batteries in series and parallel to form a lithium-ion battery pack. The lithium-ion battery protection board has protection functions such as over-charge, over-discharge, over-current, and short circuit. Give full play to the safety and stability of the power lithium-ion battery pack. It can work continuously for up to 2040 minutes on a single charge.

Lithium batteries are widely used in electric tools, lighting, wind energy storage, electric cars, toys, instrumentation, UPS backup power, communication equipment, medical equipment and special lamps. So what is the price of lithium batteries? How do lithium battery manufacturers in the market price lithium batteries?

KC certification is a national unified certification mark implemented by the Korean National Standards Committee. Lithium batteries are included in the KC certification catalog as a compulsory certification product. At present, the testing of portable secondary lithium battery packs and lithium batteries must be performed by authorized laboratories in South Korea, and cannot be transferred with the CB report of IEC 62133. After the product has passed the evaluation, it will be issued a Confirmation Letter of Declaration valid for 5 years, during which no factory inspection is required.