Multi image decryption of the birth process of 18650 battery cells.

Multi image decryption of the birth process of 18650 battery cells.

Lithium batteries are currently the most widely used batteries in the digital field. Its most prominent advantage is its high energy density, making it suitable for digital products that place great emphasis on size and portability. Meanwhile, compared to traditional dry batteries, lithium-ion batteries can be recycled and have environmental advantages. Both positive and negative electrode materials of lithium-ion batteries can absorb and release lithium ions.

However, the chemical potential energy of lithium ions differs between the positive and negative electrodes. The chemical potential energy of lithium ions in the negative electrode is high, while the chemical potential energy of lithium ions in the positive electrode is low. When lithium ions are discharged, the lithium ions stored in the negative electrode are released and absorbed by the positive electrode. Due to the higher chemical potential energy of lithium ions in the negative electrode compared to the positive electrode, this potential energy difference is released in the form of electrical energy. The charging process is a reversal of the above process, releasing lithium ions from the positive electrode into the negative electrode. Due to the back and forth migration of lithium ions between the positive and negative electrodes, lithium-ion batteries are also known as rocking chair batteries.

18650 is currently the most common lithium battery packaging method, whether it is the most popular ternary material, the nationally promoted lithium iron phosphate, or the yet to be popularized lithium titanate, all have 18650 specifications. 18650 type battery cells are packaged in a cylindrical cylindrical shape using a Cylindrical packaging method. These cells have a diameter of 18mm and a length of 65mm, and are widely used in fields such as power banks, electric vehicles, laptops, and high-intensity flashlights. The advantage of this type of packaging is that it has uniform specifications, facilitates automation and large-scale production, and has high mechanical strength, strong impact resistance, and high yield rate; In addition, there is a Prismatic square pouch package, commonly found on mobile phones and tablets. The most direct benefits of this type of package are its lightweight, small size, and portability.