The Ultimate Guide to Choosing Cylindrical Lithium Cells

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.

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Part 1. Characteristics of cylindrical 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.

Part 2. Structure of cylindrical battery

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.

Part 3. 7 common types of cylindrical batteries

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 .

1. battery

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.

2. battery

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.

3. battery

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.

4. battery

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.

5. battery

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.

6. battery

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.

7. battery

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.

Part 4. Cylindrical battery voltage, capacity, charger and PCB

1. Rated voltage of cylindrical battery cells

3.7V/3.2V

2. Cylindrical battery cell capacity

Common cylindrical battery cell capacities are as follows:

• battery cell nominal capacity: 320mAh,
• battery cell nominal capacity: 500mAh-700mAh,
• battery cell nominal capacity: 600mAh-800mAh,
• battery cell nominal capacity: mAh
• battery cell nominal capacity: 700mAh,
• battery cell nominal capacity: 900mAh,
• battery cell nominal capacity: mAh-mAh,
• battery cell nominal capacity: mAh, mAh, mAh, mAh, mAh, mAh, mAh, mAh, mAh, mAh, mAh, etc.
• battery cell nominal capacity: mAh, mAh, mAh, etc.
• battery cell nominal capacity: mAh, mAh, mAh, etc.
• battery cell nominal capacity: mAh, etc.

3. Cylindrical battery pack voltage

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.

4. Cylindrical battery pack capacity

Common cylindrical battery pack capacities: 2AH, 4AH, 5AH, 6AH, 8AH, 10AH, 12AH, 15AH, 20AH, etc.

5. Cylindrical battery charger

Cylindrical battery chargers can be equipped according to different battery packs, and there is no specific charger.

6. Cylindrical battery PCB

Most cylindrical batteries have overcharge protection, overdischarge protection, short circuit protection, overcurrent protection, overheating protection and other functions to ensure battery safety.

Part 5. Cylindrical battery pros and cons

Advantages of cylindrical lithium batteries

1. The cylindrical battery production process is mature, the PACK cost is low, the battery product yield is high, and the heat dissipation performance is good;
2. Cylindrical batteries have formed a series of internationally unified standard specifications and models with mature technology and suitable for mass continuous production;
3. The cylindrical battery has a large surface area and a good heat dissipation effect;
4. Cylindrical batteries are generally sealed batteries, and there are no maintenance problems during use;
5. The cylindrical battery shell has high voltage resistance and will not cause swelling of square or soft-packaged batteries during use.

Disadvantages of cylindrical lithium batteries

1. The cylindrical lithium battery cell size is larger. When the current is discharged, the internal temperature of the winding core is relatively high.
2. The activity at the edge of the cylindrical lithium battery pole piece is poor. Battery performance declines more obviously after long-term use.
3. Cylindrical lithium batteries come in different sizes, resulting in poor versatility. The lamination process during battery production is uneven, resulting in poor consistency.

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.

Part 6. FAQs

Are you considering using cylindrical lithium-ion batteries for your next project? If so, it’s important to understand the different sizes available and how they can be used to meet your specific requirements. In this comprehensive guide, we will walk you through everything you need to know about cylindrical lithium-ion battery sizes.

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From the popular to the smaller and larger , we’ll explore the most common sizes used in various applications . Whether you’re an engineer, designer, or hobbyist, this guide will equip you with the knowledge to make informed decisions when it comes to selecting the right battery size for your needs.

Not only will we discuss the physical size and capacity of each size battery, but we’ll also delve into their benefits, limitations, and compatibility with different devices. By the end of this guide, you will have a clear understanding of which size cylindrical lithium-ion battery is best for your specific application.

Cylindrical lithium-ion batteries come in a variety of sizes, and its number usually indicates its physical size. The first two digits are the diameter of the battery in millimeters, the last two digits are generally the height in millimeters, and the fifth digit indicates the cylindrical shape. For example, the cylindrical battery has a diameter of 18 mm and a height of 65 mm, with 0 indicating cylindrical shape. This complies with the IEC standard for cylindrical primary cells. Manufacturers can also use non-IEC names for their products.

1.

The battery is a lithium-ion battery with a diameter of 10mm and a height of 44mm. It usually has a small capacity of only a few hundred mAh. This type of battery is ideal for devices that require a compact power source and is mainly used in small electronic products such as micro flashlights, mini stereos, speakers, etc.

2.

The battery is a lithium-ion battery with a diameter of 14mm and a height of 50mm, similar in size to an AA battery. The nominal capacity is usually below mAh. It is widely used in various consumer electronic products, such as LED flashlights, wireless speakers, wireless keyboards, electric toys, digital cameras, etc.

3.

The battery is a lithium-ion battery with a diameter of 16mm and a height of 50mm. Capacity is usually slightly higher than .Commonly used in flashlights, headlights, laser lights, lighting fixtures, etc.

4.

The battery is perhaps the most popular cylindrical lithium-ion battery size. It has a diameter of 18 mm and a length of 65 mm. The nominal capacity is usually between ~mAh. It offers a balance between capacity and size. is widely used and is the first choice for many electronic devices. It is commonly used in applications such as laptops, flashlights, power tools, e-scooters and e-bikes.

5.

The is a lithium-ion battery with a diameter of 21 mm and a height of 70 mm. The nominal capacity of the battery is generally between and mAh. Widely used in solar street lights, LED lights, balance vehicles, electric bicycles, electric vehicles, etc.

is larger and has higher capacity than , and its volume and energy density are higher than battery. Therefore, some products will use instead of batteries in their power supply design.

6.

If you need a larger cylindrical lithium-ion battery, the size may be the right choice. With a diameter of 26mm and a length of 65mm, it offers a higher capacity than the battery. This size is commonly used in high-power devices such as electric vehicles, solar energy storage systems, and power banks. It can also be used for larger high-power LED flashlights and some electronic cigarettes. The battery’s larger size allows for more energy storage, making it suitable for applications that require extended runtimes.

1. Diameter: The diameter of a cylindrical lithium-ion battery determines its physical size and compatibility with devices and battery holders. Common diameters include 18mm, 14mm, and 26mm for , , and cell sizes respectively.

2.Length: The length of a cylindrical lithium-ion battery also affects its physical size and compatibility. Longer batteries generally have higher capacities but may not be suitable for all devices. For example, the and cells are 65 mm long, while the cell is 50 mm long.

3.Capacity: Battery capacity is a measure of the amount of energy a battery can store. Usually measured in milliamp hours (mAh) or ampere hours (Ah). The capacity of cylindrical lithium-ion batteries varies depending on their size, with larger batteries generally having higher capacities. For example, batteries range in capacity from mAh to mAh, while batteries typically have a capacity around 800mAh.

4.Voltage: Voltage is another important parameter to consider when choosing a cylindrical lithium-ion battery. Most have a nominal voltage of 3.7 volts, but their voltage will vary depending on the charge level.

5.Discharge current: The discharge current is the maximum current that a battery can deliver continuously. It is usually measured in amperes (A) or milliamperes (mA). High-power applications require batteries with higher discharge currents, while low-power devices can work with lower discharge currents.

1.Application requirements: First understand the specific requirements of the application. Consider factors such as power consumption, voltage requirements, and physical space constraints. High-power applications such as electric vehicles may require larger batteries, while low-power devices can use smaller batteries.

2.Size and weight: Consider the physical size and weight limitations of the device. Smaller batteries (such as the ) may be suitable for compact devices, while larger batteries (such as the ) may be more appropriate for devices with ample space.

3.Energy Density: Energy density refers to the amount of energy stored in a battery per unit volume or weight. If you need a battery with a high energy density, you may opt for a larger size like the or . However, keep in mind that higher energy density often comes at a higher cost.

4.Cost: Consider your budget when selecting a cylindrical lithium-ion battery size. Larger batteries with higher capacities tend to be more expensive. Evaluate the cost-benefit ratio and choose a size that offers the best balance between price and performance.

5.Availability and Compatibility: Ensure that the battery size you choose is readily available and compatible with your device or application. Some battery sizes, such as the , have a wide range of options from various manufacturers, making them easily accessible.

With these factors in mind, you can narrow down your choices to a cylindrical lithium-ion battery that suits your specific needs.

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