A lithium-ion battery pack is an assembly of individual lithium-ion batteries connected in series and parallel to form a battery pack with a certain voltage and capacity, and equipped with a protection board for safe charging and discharging.
What is a polymer lithium-ion battery?
Based on the different electrolyte materials used, lithium-ion batteries are divided into liquid lithium-ion batteries and polymer lithium-ion batteries or plastic lithium-ion batteries. The positive and negative electrode materials used in polymer lithium-ion batteries are the same as those in liquid lithium-ion batteries. The positive electrode materials include lithium cobalt oxide, lithium manganese oxide, ternary materials, and lithium iron phosphate materials, while the negative electrode is graphite. The working principle of these batteries is also basically the same.
Lithium-ion battery pack
Features of lithium-ion battery packs
Service life: At room temperature and 1C charge and discharge, the capacity of a single cell is still greater than 80% after 2000 cycles, and the 3C cycle life reaches more than 800 cycles.
Composition structure: It can combine individual lithium-ion batteries according to customer needs, which can have a higher capacity than individual lithium-ion batteries.
Discharge rate: At a 5C discharge rate, the discharge rate can reach 90%.
Charge and discharge: It can be charged and discharged quickly at a high current of 2C. With a dedicated charger, the battery can be fully charged in 40 minutes at 1.5C. The starting current can reach 2C.
polymer lithium-ion batteries
Features of polymer lithium-ion batteries
Composition and structure: Polymer lithium-ion batteries use aluminum-plastic soft packaging, which is different from the metal shell of liquid cells. In the event of a safety hazard, liquid cells are prone to explosion, while polymer cells will at most bulge.
Volume and thickness: Ultra-thin, the battery can be assembled into a credit card. Conventional liquid lithium batteries use a method of first customizing the casing and then inserting the positive and negative electrode materials, and there is a technical bottleneck in achieving a thickness of less than 3.6mm. Polymer cells do not have this problem, and the thickness can be less than 1mm.
Battery weight: Batteries using polymer electrolytes do not require a metal casing for protection. Polymer batteries are 40% lighter than steel-cased lithium batteries of the same capacity and 20% lighter than aluminum-cased batteries.
