Most primatic LFP cells are thick electrode design. Thick electrode means the thickness of graphite negative electrode and positve LFP electrode are 110 to 150 um thick. This yields the most AH capacity per unit volume and weight but cell suffers from ion starvation above about 0.5CA cell current caused by the thick electrodes. This increases terminal voltage slump and internal cell heating accelerates above 0.5 CA cell current.
Most cyclindical cells are made with thinner electrodes design in 50 um to 100 um thickness. This means more layers are required for same AH rating as capacity is dependent on amount of graphite and LFP material. More layers mean more copper foil, aluminum foil, and electrolyte. This costs more, takes up volume, and adds weight. Extra metal foil benefits are lower contact resistance and better heat dissipation. Cylindrical cell with thin electrode allow high peak cell current with onset of electrode layer ion starvation at a much higher current. This also helps at cold temps where ion migration rate slows down.
Prismatic cells with thick electrode design.
+ Most capacity per unit volume and weight
+ lowest cost
- lower peak discharge current
- less ability to dissipate internal cell heating
Cylindrical cells with thin to moderate electrode design
+ higher peak current discharge rate
+ ability to dissipate internal heating
+ better cold temp performance
- AH per volume/weight
- higher cost
There is really no difference in damaging effects of, depth of discharge between thin or thick electrode designs. Both will grow metal dendrites if left for moderate time below 1.0 vdc and both will have severe electrolyte decomposition if discharged below about 0.1 vdc or charged above 4.3 vdc.
Cylindrical batteries can be divided into lithium iron phosphate batteries, lithium cobalt oxide batteries, lithium manganate batteries, and cobalt-manganese hybrid batteries based on filler materials. According to the type of shell, cylindrical lithium batteries can be steel shell lithium batteries and polymer shell lithium batteries.
1. Appearance of cylindrical lithium battery
Cylindrical lithium batteries generally comprise positive electrode material (nickel cobalt oxide or zinc manganate), separator paper, and electrolyte. The casing of the cylindrical battery is made of aluminum-plastic composite pipe.
2. Cylindrical lithium battery capacity
The rated energy density of a single cylindrical lithium battery is between 300 and 500Wh/kg. Its specific power can reach more than 100W. According to different models and specifications of cylindrical batteries, the actual performance of this type of battery varies.
3. Safety and reliability of cylindrical lithium batteries
Cylindrical batteries have the characteristics of high safety and stability, resistance to overcharge, high temperature resistance, and long service life.
4. Cylindrical lithium battery application
Cylindrical lithium batteries can be used as power sources. In addition, they can also be seen in digital cameras, MP3 players, notebook computers, car starters, power tools, and other portable electronic products.
A general cylindrical lithium-ion battery consists of a casing, a cap, a positive electrode, a negative electrode, a separator, and an electrolyte. Generally speaking, the casing of a cylindrical battery is the battery&#;s negative electrode, and the cap is the battery&#;s positive electrode. The battery casing is made of nickel-plated steel plate.
The critical difference between power cylindrical batteries and ordinary cylindrical batteries lies in the conductive connection structure of the battery. A special high-current structure design is required because the general application current of power lithium batteries is relatively large.
Cylindrical lithium batteries usually have a five-digit model number. Starting with the numbers on the left, the first and second numbers refer to the battery diameter. The third number refers to the battery height. The fifth number refers to the circle.
There are many models of cylindrical lithium batteries; the more common ones are , , , , , , and .
The battery is a lithium battery with a diameter of 10 mm and a height of 44 mm. It&#;s the same size as what we usually call an AA battery. The capacity of this kind of battery is generally very small, only a few hundred mah. This battery is mainly used in mini electronic products, such as flashlights, mini audio, speakers, etc.
The battery is a lithium battery with a diameter of 14 mm and a height of 50 mm. This battery voltage is generally 3.7V or 3.2V. The nominal capacity of the battery is relatively small, a little larger than the battery, generally mah. The battery has excellent discharge performance and is mainly used in consumer electronics, such as wireless audio, electric toys, digital cameras, etc.
The battery is a lithium battery with a diameter of 16 mm and a height of 34 mm. This kind of battery often appears in bright flashlights, LED flashlights, headlights, laser, lighting lamps, etc. Because the battery is shorter in height, its capacity is a little small.
The battery is a lithium battery with a diameter of 18 mm and a height of 65 mm. Its most prominent feature is that the energy density is very high, almost reaching 170 Wh/kg. Therefore, this battery is a very cost-effective battery. Most of the batteries we often see are this type of battery. Because it is a relatively mature lithium battery. battery has good system quality stability in all aspects. batteries can be widely used in battery capacity applications of about 10 kWh, such as mobile phones, laptops and other small appliances.
The battery is a lithium battery with a diameter of 21 mm and a height of 70 mm. Due to its increased volume and increased space utilization, the energy density of battery cells and systems can be increased. The volume energy density of the battery is much higher than that of the battery, and it is widely used in digital, electric vehicles, balance vehicles, solar lithium battery street lights, LED lights, power tools, etc.
The battery is a lithium battery with a diameter of 26mm and a height of 65mm. Its nominal voltage is 3.2V. The nominal capacity is mah. batteries have excellent capacity and high consistency. It has gradually become an alternative trend to batteries, and will also gradually become popular in power batteries.
The battery is a lithium-ion battery with a diameter of 32 mm and a height of 65 mm. This kind of battery has strong continuous discharge capability, so it is more suitable for electric toys and backup power supply. UPS battery, wind power generation system.
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3.7V/3.2V
Common cylindrical battery cell capacities are as follows:
Common cylindrical battery pack voltages are 3.2V, 3.7V, 6.4V, 7.4V, 9.6V, 11.1V, 12V, 14.8V, 22.2V, 24V, 36V, 48V, etc.
Common cylindrical battery pack capacities: 2AH, 4AH, 5AH, 6AH, 8AH, 10AH, 12AH, 15AH, 20AH, etc.
Cylindrical battery chargers can be equipped according to different battery packs, and there is no specific charger.
Most cylindrical batteries have overcharge protection, overdischarge protection, short circuit protection, overcurrent protection, overheating protection and other functions to ensure battery safety.
The above is a summary of all aspects of cylindrical batteries. Cylindrical lithium batteries are more suitable for large-volume automated combination production. Large-volume lithium-ion batteries such as electric bicycles and electric motorcycles are basically produced from cylindrical lithium batteries. Not only that, cylindrical lithium batteries are also recognized as green and healthy batteries. They are very environmentally friendly and can be used with confidence.
Yes, their cylindrical shape and rigid casing make them more resistant to swelling and mechanical stress.
They offer better heat dissipation and higher energy density and are often more cost-effective.
They are widely used in power tools, laptops, e-bikes, and even electric vehicles.
Common cathode materials like NCA, NMC, and LFP offer different energy density, safety, and cost trade-offs.
Like all lithium batteries, they require proper protection circuits and handling to avoid short circuits, overheating, or damage.
They should be stored in a cool, dry place and transported according to relevant regulations for lithium batteries.
Yes, they can be recycled, but proper disposal methods are required to avoid environmental hazards.
Their lifespan depends on usage patterns, but they typically last 2-5 years with proper care and maintenance.
Generally, they are more cost-effective than prismatic or pouch cells, especially for high-volume applications.
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Gerald
Electronic Engineering Writer
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