At present, there are three main types of battery cells in the lithium battery market: cylindrical lithium batteries, soft pack lithium batteries, and square lithium batteries, which are applied to various fields of life. So, which is better for a cylindrical lithium battery soft pack lithium battery square lithium battery? Let's explore it together.

Comparison between cylindrical lithium batteries and square lithium batteries

1. Battery shape: Square size can be designed arbitrarily, while cylindrical batteries cannot be compared.

2. Multiplication characteristics: The process limitations of welding multipole ears in cylindrical batteries are slightly worse than those in square multipole ear batteries.

3. Discharge platform: Lithium batteries using the same positive and negative electrode materials and electrolyte should theoretically have the same discharge platform, but the discharge platform inside a square lithium battery is slightly higher.

4. Product quality: The manufacturing process of cylindrical batteries is relatively mature, with a low probability of secondary cutting defects in the electrode plates. Additionally, the maturity and automation level of the winding process are relatively high. Currently, the lamination process is still semi manual, which has a negative impact on battery quality.

5. Pole ear welding: Cylindrical battery pole ears are easier to weld than square lithium batteries; Square lithium batteries are prone to false soldering and affect battery quality.

6. PACK grouping: Cylindrical batteries have the characteristic of being easier to use, so PACK technology is simple and has good heat dissipation effect; When packing square lithium batteries, it is necessary to solve the problem of heat dissipation.

7. Structural features: The chemical activity at the corners of the square lithium battery is poor, and the energy density of the battery is prone to decay after long-term use, resulting in a short battery life.

Comparison between cylindrical lithium batteries and soft pack lithium batteries

1. The safety performance of the soft pack battery is good. The structure of the soft pack battery is packaged with aluminum plastic film, and when safety issues occur, the soft pack battery will generally burst and crack, unlike the steel shell or aluminum shell battery cells that can explode; In terms of safety performance, it is superior to cylindrical lithium batteries.

2. Soft pack batteries are relatively lightweight, with a weight 40% lighter than steel shell lithium batteries of the same capacity and 20% lighter than cylindrical aluminum shell lithium batteries; The internal resistance of the soft pack battery is smaller than that of the lithium battery, which can greatly reduce the self consumption of the battery;

3. The cycling performance of the soft pack battery is good, and the cycling life of the soft pack battery is longer. The attenuation after 100 cycles is 4% to 7% less than that of the cylindrical aluminum shell battery;

4. The design of the soft pack battery is relatively flexible, with a variable shape and can be thinner. It can be customized according to customer needs and new battery cell models can be developed. And cylindrical lithium batteries do not meet this condition.

5. Compared to cylindrical lithium batteries, the shortcomings of soft pack batteries are poor consistency, high cost, and easy leakage. The high cost can be solved through large-scale production, while leakage can be solved by improving the quality of aluminum plastic film.

Shenzhen Topband Battery Co., Ltd.，established in 2006, is a wholly-owned subsidiary of Shenzhen Topband Co., Ltd. (002139.SZ). We focus on lithium iron phosphate batteries,with independent research and development in cells and BMS. With the ability to integrate the entire industry chain, we are committed to providing customers with one-stop lithium battery solutions and services. Our quality products are widely used in energy storage and light power.