There is no difference between square lithium battery and cylindrical lithium battery in essence, which is to meet the product requirements. In addition to cylindrical lithium-ion batteries, square lithium-ion batteries are very common in daily life. They have many types, and are widely used in MP3, MP4, mobile phones, aircraft models and other electronic products.

Square lithium-ion batteries are divided into metal shell packaging (silver white hard shell) and aluminum plastic shell packaging (gray white soft shell, which can be scratched with nails) The metal shell encapsulates the lithium ion battery or liquid lithium battery, and the aluminum plastic shell encapsulates the lithium ion polymer lithium battery The chemical materials and electrochemical characteristics used by these two types of batteries can be said to be much the same, but the main difference is that lithium ion polymer lithium batteries use some colloidal substances to help the battery plates stick together or absorb electrolyte, reducing the use of liquid electrolyte, so that the battery packaging can be changed from metal shell to aluminum plastic shell.

The shell of the metal shell lithium battery is a negative pole, and the positive pole is on the protrusion at one side of the battery; The positive and negative electrodes of the aluminum plastic shell lithium battery are two plates on one side of the battery, and the shell is an insulator

For square lithium-ion batteries, the model number is generally 6 digits. The first two digits are the thickness of the battery, with 1 decimal place; The middle two digits are the width of the battery; The last two digits are the length of the battery in millimeters. For example, 606168 lithium battery (18650 cylindrical) is 6.0 mm thick, 61 mm wide and 68 mm long.

The nominal voltage of the square lithium-ion battery is generally 3.6~3.7V, and the charging termination voltage is generally 4.2V.

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.