In the fast - paced world of battery technology, understanding the differences between pouch batteries and cylindrical or prismatic batteries is of great significance. These battery types vary significantly in terms of their characteristics, making them suitable for different applications.

Appearance and Structure

Pouch batteries, as the name implies, are encased in an aluminum - plastic composite film. This soft and flexible packaging allows for a high degree of customization in shape. They can be easily tailored to fit into various irregularly shaped spaces, which is why they are widely used in small consumer electronics such as smartphones, tablets, and wearable devices. The flexibility of the pouch enables designers to make the most of the available space, optimizing the overall design of the device.

On the other hand, cylindrical batteries have a distinct circular cross - section. The most well - known example is the 18650 battery. They are typically housed in a metal casing, usually made of steel or aluminum alloy. This robust metal enclosure provides excellent mechanical protection for the internal components of the battery, such as the electrodes and the electrolyte. The cylindrical shape also offers some advantages in terms of heat dissipation and electrical conductivity.

Prismatic batteries, with their rectangular, prism - like shape, are also encased in a metal shell. This design is popular in the electric vehicle (EV) industry due to its ability to be arranged in modules more efficiently, providing a high - energy - density solution for powering vehicles. The metal casing of both cylindrical and prismatic batteries offers strong structural support, ensuring the durability of the battery under various operating conditions.

Safety

When it comes to safety, pouch batteries have their own set of pros and cons. The soft aluminum - plastic composite film allows the battery to expand slightly in case of internal gas generation, which can reduce the risk of a violent explosion. However, this type of packaging is more vulnerable to punctures and tears. If the pouch is damaged, there is a higher risk of electrolyte leakage, which can not only damage the battery but also pose a safety hazard.

Cylindrical and prismatic batteries, with their sturdy metal casings, offer better protection against external impacts. The metal shell can withstand a certain amount of pressure and physical abuse without leaking electrolyte. However, in extreme cases, such as a severe internal short - circuit, the rigid metal casing may not relieve the pressure as effectively as the flexible pouch of a pouch battery, potentially leading to more serious consequences.

Why Aren't Pouch Batteries Commonly Used in Electric Vehicles?

Despite their flexibility and some safety advantages, pouch batteries are not as commonly used in electric vehicles as cylindrical or prismatic batteries. One of the main reasons is the harsh operating environment of EVs. Electric vehicles are subject to high levels of vibration, mechanical stress, and temperature variations during operation. The robust structure of cylindrical and prismatic batteries is better able to withstand these challenging conditions.

Another factor is the need for large - scale energy storage and high - power output in EVs. Cylindrical and prismatic batteries generally offer more stable performance and better electrical conductivity under high - load conditions. Additionally, the long - term durability and reliability requirements of EV batteries are more easily met by the more rigid designs of cylindrical and prismatic batteries.

Our Offer: Pouch Battery Assembly and Testing Equipment

At Sunka Lead, we are dedicated to providing top - notch pouch battery assembly and testing equipment. Our assembly equipment is designed with precision and efficiency in mind. It can handle the delicate process of pouch battery assembly, from cell handling to the final sealing of the pouch, ensuring a high - quality end - product.

Our testing equipment is equally impressive. It can perform a wide range of tests on pouch batteries, including electrical performance testing, capacity measurement, and safety inspections. With our advanced testing equipment, we can detect even the slightest defects in pouch batteries, ensuring that only the best - quality products reach the market.

If you are interested in learning more about our pouch battery assembly and testing equipment, please feel free to contact us. We are here to help you enhance your pouch battery production capabilities and take your business to the next level.