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In the world of batteries, there are three primary form factors: prismatic aluminum-cased batteries, cylindrical batteries, and pouch cells. Each, with its own unique characteristics, plays a key role in different fields, impacting every aspect of our lives.
Prismatic aluminum-cased batteries: A widely used all-rounder
Prismatic aluminum-cased batteries are currently a widely adopted battery form factor. Their outer shell is made of aluminum alloy, and their internal structure accommodates larger cells, making them a standout in numerous battery applications.
From a supply perspective, prismatic aluminum-cased batteries have a large number of suppliers, resulting in relatively low procurement costs. Many well-known domestic battery suppliers, such as CATL, have focused on aluminum-cased batteries as a primary product development, driving their market adoption.
In terms of performance, prismatic aluminum-cased batteries offer significant advantages in cell size and capacity, enabling higher energy density than other battery forms. This high capacity means fewer cells are required when combining multiple cells into a battery pack. For example, the use of high-capacity prismatic aluminum-cased cells in some electric vehicle battery packs effectively reduces the number of cells in the pack. At the same time, the reduction in the number of cells also reduces the requirements for the battery management system (BMS). With fewer cells to manage, the BMS can more accurately monitor and regulate parameters such as voltage, current, and temperature for each cell, thereby improving the overall stability and reliability of the battery pack. However, the larger cell size and metal casing also increase weight, and the requirements for materials and manufacturing processes make the cost relatively high.
Prismatic aluminum-cased batteries are widely used in new energy vehicles, especially those with specific requirements for battery capacity and spatial layout. Furthermore, in energy storage systems, prismatic aluminum-cased batteries, with their large capacity and stability, play a vital role in storing electrical energy, contributing to the stable operation of the power grid and the rational allocation of power.
Cylindrical Batteries: A "Conservative" Technology with Mature Technology
Cylindrical batteries have a cylindrical appearance similar to the common AA battery. The 18650 battery is a typical example of cylindrical batteries, boasting a high level of technological maturity. The name "18650" actually refers to its dimensions: 18mm in diameter and 65mm in length. This type of battery has unified structural features and standards, significantly improving the level of production automation.
In terms of performance advantages, cylindrical batteries offer excellent single-cell energy density, surpassing prismatic hard-shell batteries. Furthermore, they offer exceptional cycling performance, capable of withstanding multiple charge and discharge cycles while maintaining good performance. Cylindrical batteries also excel in rapid charging and discharging, with high charging efficiency and high output power. Tesla, for example, leverages the advantages of cylindrical batteries in energy density and charge and discharge performance to provide powerful and stable power for its vehicles.
Cylindrical batteries have a wide range of applications. In laptops, they provide long-lasting power, meeting the needs of mobile office users. In digital cameras, their high energy density and excellent charge and discharge performance ensure sufficient power for frequent flash use and extended shooting. In lighting fixtures, the long life and stable output of cylindrical batteries provide continuous, bright light. In toys, the standardized specifications of cylindrical batteries make them easy to install and replace, powering a wide range of electric toys. In power tools, the powerful output of cylindrical batteries ensures efficient operation.
Soft-pack batteries: Flexible and lightweight "innovators"
The name of the soft-pack battery suggests its uniqueness. Its outer shell is made of aluminum-plastic film, a stark contrast to the metal shells of cylindrical and prismatic aluminum-cased batteries. This material makes the battery lighter overall and offers higher energy density than prismatic and cylindrical batteries.
One of the biggest advantages of soft-pack batteries is their modular customization. The colloidal nature of their electrolyte allows for significant flexibility in shaping. In small electronic devices like mobile phones, soft-pack batteries can be customized to fit the tight and irregular spaces within the device, effectively improving space utilization while reducing weight. The advantages of soft-pack batteries are also fully demonstrated in applications where space and weight are critical, such as drones and wearables. For example, drones need to maintain sufficient power while minimizing weight to extend flight time and enhance maneuverability. The lightweight and customizable nature of soft-pack batteries perfectly meets this requirement.
However, soft-pack batteries also have some limitations. Due to their relatively weak structure, they often require additional casing for protection and support during assembly, which increases costs. Furthermore, the production process for soft-pack batteries is complex, requiring high environmental and technical requirements. This presents challenges in large-scale production, and product consistency is relatively difficult to control.
In general, prismatic aluminum-cased batteries have established a firm foothold in the new energy vehicle and energy storage sectors thanks to their large capacity and stability. Cylindrical batteries, with their mature technology, high energy density, and excellent charge and discharge performance, are widely used in numerous electronic devices and vehicles. Soft-pack batteries, with their lightweight, high energy density, and customizability, demonstrate unique value in space- and weight-sensitive small electronic devices and some high-end applications. These three battery forms each have their own advantages and disadvantages, but together they constitute a rich and diverse battery application market, meeting people's energy needs in diverse scenarios
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