Industrial Laser Marking Systems / Laser Markers
Prismatic vs. Cylindrical Cells: What is the Difference?
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Tags:
- Electric Vehicle , Battery , Laser Cleaning
Batteries are used for powering all types of electronic devices—from power tools and medical devices to everyday electronics. But the word “battery” doesn’t encapsulate the specifications behind the types of cells powering these devices. Two popular battery types are prismatic and cylindrical cells. These cells are notable for their qualities as well as the different ways in which they function.
Prismatic and cylindrical cells differ in uses, energy density, thermal performance, and life cycle. In some cases, they are used for the same application, but these unique qualities make it important to understand their use cases when selecting the right battery for different applications. No overall “better” cell exists, but each has advantages depending on your overall design and goals.
With that said, read on to learn the ins and outs of prismatic vs. cylindrical cells.
What Are Prismatic Battery Cells?
A prismatic battery cell is a rectangular battery developed in the 1990s with stacked electrodes and separators. Prismatic cells were created to improve manufacturing efficiency by being larger yet more compact than cylindrical designs.
Structure and Design
Prismatic cells use layered construction where electrode sheets stack flat together, eliminating wasted space. The aluminum or steel casing maintains the flat profile while protecting internal components. Modern prismatic battery cell designs use advanced separators that prevent short circuits while ensuring smooth ion flow.
Applications of Prismatic vs. Cylindrical Cells in Various Industries
Prismatic cells lead in automotive applications by maximizing energy storage in tight compartments. Electric vehicle makers prefer their customizable design. Energy storage systems choose prismatic vs cylindrical cells for efficient stacking in grid installations. Industrial and medical manufacturers select these for high-energy density applications.
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What Are Cylindrical Battery Cells?
A cylindrical cell comprises rolled-up electrodes and separators stored in a cylindrical-shaped can. As one of the first batteries ever made in 1900, cylindrical cells are versatile and are produced quickly at a low price.
Structure and Design
Cylindrical battery construction uses a spiral-wound design where electrodes roll around a central core. This design has proven reliable over decades across countless applications.
Cylindrical cell production is highly efficient and cost-effective through automated rolling processes. Standard sizes like 18650 and 21700 create economies of scale.
The metal casing provides structural integrity and heat dissipation. The round shape distributes pressure evenly and allows natural convection cooling.
Common Applications
Consumer electronics rely on cylindrical cell technology for laptops, power tools, and flashlights. Standardized sizes make them interchangeable, with proven safety records.
Electric bicycles use cylindrical battery configurations for thermal management and reliability. The modular nature allows easy capacity scaling.
Industrial applications choose these options for backup power and emergency equipment for their long cycle life and extreme temperature performance.
Key Differences Between Prismatic and Cylindrical Cells
Prismatic and cylindrical cells may share characteristics, such as being made of lithium-ion cells or being utilized as EV batteries. Nonetheless, producers select one over the other due to the significant variances between the two.
Form Factor and Space Efficiency
Prismatic vs cylindrical cells show dramatic differences in space utilization. Rectangular prismatic cells achieve nearly 100% space utilization, eliminating gaps and maximizing energy storage per volume.
Cylindrical cell arrangements create gaps between round cells, resulting in 70-80% space efficiency. However, these gaps provide natural cooling channels that prevent overheating during high-power applications.
Prismatic battery cell designs can be customized for specific applications, while cylindrical options follow standardized dimensions that reduce costs but limit flexibility.
Performance and Reliability
The thermal behavior of cylindrical and prismatic cells varies greatly. Sophisticated cooling mechanisms are necessary because compact prismatic cells can produce hot spots where heat gets trapped.
Cylindrical battery designs excel in thermal management due to their shape and spacing. Round geometry promotes even heat distribution, while gaps allow natural cooling, making them suitable for high-power applications.
Cylindrical cell construction handles pressure changes better due to even distribution across the casing. Prismatic cells may experience stress points affecting reliability, though modern designs have improved materials to address this.
Cylindrical and prismatic cells can have similarities, such as both being used as EV batteries or both being composed of lithium-ion cells. However, there are stark differences between the two that make manufacturers choose one over the other.
Shape
Of course, the most apparent difference between a prismatic cell and a cylindrical cell is the shape.
- Prismatic Cell
- A prismatic cell is thin and rectangular. Because of this, they can easily be made into battery packs holding layers of prismatic cells. The flattened shape holds the energy together and leaves no room for energy to escape. Also, since their shape is flat, prismatic cells can be made into a customizable prismatic battery cell pack for specific applications.
- Cylindrical Cells
- Cylindrical cells are indeed cylindrical, which can be both an advantage and disadvantage. For example, think of a classic AA battery that goes into your TV remote. These cells are smaller than prismatic tools and can’t be stacked as easily because of their shape. Since the sides are curved, the stacking leaves gaps between the cells instead of compacting them on top of each other.
Although the gaps can be a disadvantage because they take up more space in a battery pack or let out energy, they can also be an advantage to promote airflow, and the cylindrical shape can discharge energy fast without swelling. The shape of cylindrical cells allows them to combat severe environments like space.
Energy Density
Energy density is the amount of energy a cell holds per volume. Depending on the application, the differences in energy density can be a benefit or a hindrance. The topic of energy density is most notable in the EV community, as there is debate about what type of energy density an EV should have for optimal safety and longevity.
Whether prismatic vs. cylindrical cells have a greater energy density is also debatable. It is often reported that the cylindrical cell has the higher energy density, but the prismatic cell has more energy per cell due to the larger size and ability to pack closer together.
At the end of the day, it is due to other cell qualities that determine whether prismatic vs cylindrical cells have higher density. With energy and energy density, it’s important to keep in mind the size difference between prismatic and cylindrical and how each is stacked.
Life Span
- Prismatic Cell
- A prismatic battery cell has a lifespan of 2,000 cycles. While this is shorter than cylindrical cells, that doesn’t necessarily imply a negative because a long life cycle isn’t always required. A prismatic cell can also reach longer life spans when stacked into a battery pack.
- Cylindrical Cell
- Cylindrical batteries have a lifespan of 25,000 cycles, which is a driver for their use of longevity.
Thermal Performance
Thermal performance is how well the cell responds and regulates heat, and the different shapes of the cells are the reason for the difference in their performance.
- Cylindrical Cell
- Because of the shape, cylindrical cells have a better thermal performance from cycling the energy. Also, the spacing between the cells when stacked keeps the cells from overheating.
- Prismatic vs. Cylindrical Cells
- Since prismatic cells are stacked on top of each other, they overheat faster and more easily than cylindrical cells. The rectangular shape doesn’t cycle the heat as well as the cylindrical shape does. Additionally, since there are no gaps between cells, one overheated prismatic cell can harm the other cells.
Uses
Because of their differences in shape, thermal performance, energy density, and lifespan, cylindrical and prismatic cells have different uses. Although they may both be found in certain products, they are generally used for different functions.
- Cylindrical Cells
- Cylindrical cells are used for electric bikes, medical devices, consumer electronics, smoke alarms, and toys.
- Prismatic Cells
- Prismatic cells have flexible uses because of the stacking and are commonly used for applications needing high powers. Prismatic cells are used for energy storage systems (ESS), medical devices, hybrid and electric vehicles, and industrial equipment.
Which to Pick: Cylindrical vs. Prismatic?
There’s no one-size-fits-all for prismatic vs. cylindrical cells; it all comes down to what you want out of your battery. A prismatic cell battery would be way too strong for powering a desk lamp, but a cylindrical cell might not be the most cost-effective option for powering a large energy storage system.
In addition to basic cylindrical and prismatic cell characteristics, there are characteristics like chemical makeup, manufacturing methods, and ratios that add another layer to the choice between the two.
Ultimately, prismatic cells are used best when mighty and flexible cells are needed, while cylindrical cells are better for reliability and withstanding changing environments.
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FAQs
Why are prismatic cells more common in EV applications?
Prismatic cells offer superior space utilization in vehicle battery packs, maximizing energy storage within limited compartments. Their rectangular shape eliminates wasted space, providing more driving range per battery pack volume.
Are cylindrical cells safer than prismatic ones?
Cylindrical battery designs provide better thermal management due to natural spacing that promotes cooling. The round casing distributes pressure more evenly, reducing swelling risks.
Can the same laser marking system be used for both cell types?
Yes, laser marking systems handle both prismatic vs cylindrical cells with fixture adjustments. Prismatic cells provide easier marking access, while cylindrical cells may require rotation. Most systems include adaptable fixtures for both types.
Which battery type lasts longer, prismatic or cylindrical?
Cylindrical cell technology offers longer cycle life, often exceeding 20,000 cycles compared to 2,000-5,000 cycles for prismatic cells.
Which cell type is more cost-effective?
Cylindrical battery production benefits from manufacturing optimization and standardized sizes, making them more cost-effective per unit. Prismatic battery cell options cost more upfront but provide value where space efficiency matters.
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