Brief history of batteries: In 1800, Italian scientist Volta invented the battery, and the unit of voltage "V" was named after him. His experimental tools were inspiring, and the name "battery" came from the charged pool, and two substances with a potential difference and a medium can form a battery. Early chemical batteries could only convert chemical energy into electrical energy, and the electrochemical reaction was irreversible and disposable, such as the alkaline manganese battery in 1955 and the zinc-manganese battery in 1866.

Lithium battery characteristics
Classification: Lithium-ion batteries are divided into liquid lithium-ion batteries (such as ICR18650 lithium batteries), gel polymer lithium-ion batteries (such as mobile phone batteries) and all-solid-state lithium-ion batteries due to different electrolyte states.
Advantages of lithium materials: Lithium is the lightest metal element with high electronegativity. The reduction potential of lithium ions can reach -3V and the working voltage exceeds 3V. These excellent qualities make it an ideal material for battery production.
Composition: Mainly composed of positive electrode (lithium compound), negative electrode (carbon material), diaphragm, electrolyte (soluble organic solution containing lithium salt), positive and negative electrode ears, protection plate, packaging shell, welding piece, wire, plug, etc.

Lithium battery classification and application
General categories
Square polymer lithium battery: used in portable products such as tablets, with various sizes, energy density exceeding 450Wh/L, high platform, cycle times exceeding 500 weeks, and good batch stability.
Cylindrical lithium battery: used for lighting, etc., with a full range of sizes, energy density exceeding 480Wh/L, formula to ensure consistency, suitable for multi-string and multi-parallel combination, and cycle life of more than 400 weeks.

High temperature type
Square polymer lithium battery: used in GPS, etc., has good cycle performance, good safety performance, good sealing in high temperature environment of 80℃, energy density exceeds 420Wh/L, and can work at room temperature.
Cylindrical lithium battery: used for automobile ignition, etc. The material system can work at 80°C, has good cycle performance, a safe structure, and an integrated cap with excellent sealing.

Low temperature type
Square polymer lithium battery: suitable for portable or outdoor work tools in cold areas, the discharge retention rate exceeds 35% at -40℃ and 0.2C, and exceeds 60% at -30℃ and 0.2C.
Cylindrical lithium battery: Its application fields are the same as those of square polymer lithium battery, and its characteristics are also the same.

Rate level
Square polymer lithium battery: used for model aircraft, etc., with a continuous 25C discharge retention rate of over 85%, and a 15C, 300 cycle retention rate of over 80%. It is light in weight and has a patented structure.
Cylindrical lithium battery: used in power tools, etc., with a continuous 30C discharge retention rate of over 85%, a 15C, 300 cycle retention rate of over 80%, and good safety performance.

Power category

Square polymer lithium battery: used in energy storage equipment, etc., using lithium iron phosphate or lithium manganese oxide, 20Ah battery cells have passed multiple safety tests, and lithium iron phosphate power batteries can achieve 0.5C1000 cycles to ensure product consistency.
Cylindrical lithium battery: used in energy storage equipment, etc., lithium iron phosphate batteries ensure safety and have good batch combination consistency.
Company Profile: Dongguan Pack Team Power  is a high-tech enterprise that integrates the research and development, production and sales of sodium-ion battery cells, battery packs and energy storage batteries, and has a certain production scale.