UFINE New Energy Co., Ltd. is an innovative company that focuses on the research, development, production and sales of various new energy products. The company offers a wide range of high quality lithium batteries, as well as customized services to meet customers' individual needs. With fine craftsmanship and reliable quality as the cornerstone, UFINE is committed to providing customers with quality products and excellent service.
On 9 June 2023, UFINE lithium battery production company welcomed a customer from Sweden for a visit. In UFINE 's factory, we introduced to the customer in detail the content and control points of each production process, quality control as well as safety testing and electrical performance laboratory. After the engineer's explanation, the customer had a general understanding of the lithium battery production process and expressed high recognition of our production management and quality control, and was looking forward to future cooperation.
Electronic material mixing and positive and negative electrode manufacturing
Firstly, the dosing and mixing of the positive and negative electrodes, the proportions of the various materials and the mixing time are precisely controlled. There are several different materials for the positive electrode: lithium manganate, lithium iron phosphate, lithium cobaltate and ternary. Each of these materials has different properties. The main material for the negative electrode is graphite, which has good electrical conductivity.
The next step is the slurry coating process, where the slurry is evenly applied to the aluminium or copper with high precision equipment, the positive material to the aluminium and the negative material to the copper. The coated material is then placed in a high temperature baking chamber for baking.
The coating is put inside the roller cloth machine for roll alignment to make the electrode material more uniform, while the staff will measure the thickness of the coating with a micrometer to ensure that the energy output of the battery can be balanced and stable. The positive and negative electrode sheets are then divided into the right size to facilitate the production of the battery. Finally, lugs are welded onto each of the split positive and negative electrodes.
Welded pole lugs
The positive electrode, the negative electrode and the diaphragm are wound together. The diaphragm is a specially moulded polymer film with a microporous structure that allows lithium ions to pass freely but not electrons.
Perform a compaction to test for short circuits
The outer layer of the battery is wrapped with a layer of aluminium plastic film. Different battery sizes have different aluminium plastic film sizes and require different aluminium plastic film presses.
The finished aluminium film is used to wrap the inner cell, seal the edges once and then cover the outside of the battery with a thin transparent film to prevent scratches on the outside of the battery during the production process.
Before filling the battery with liquid, it needs to be put into a baking chamber to dry out the water and then filled with electrolyte. The electrolyte allows the lithium ions to flow sufficiently.
Battery activation and charging
Amongst the questions asked by the good customers about the formation process, "What is the main function of the formation process?"The formation process charges the cells to activate them, with a charge of approximately 60%-70%; after the formation process is complete, the second seal is applied to shape the cells and expel the air.
"The chemistry of a lithium-ion battery is the first low-current charge of the manufactured lithium-ion battery, which is designed to form a passivation layer, a solid electrolyte interface film (SEI film), on the surface of the negative electrode."
The cells are fully charged and discharged to test the size of the actual battery capacity; the battery is tested for dropout and then the battery is aged in a high temperature environment to detect any abnormalities in the capacity of the cells. Finally a full battery inspection is carried out, including whether there is a short circuit and whether the appearance of the cells is good.
Battery packing
The last thing is to assemble the protection plate, the wire and the plug to the core and to wrap the plate with a special adhesive to prevent it from having damage.
Battery testing
In addition to the production process, we also introduce our customers to our battery safety testing and electrical performance laboratory. With our advanced laboratory equipment and technology, we are able to conduct comprehensive testing and evaluation of the safety performance of the batteries.
During the visit, our customers were very concerned about quality control and made some valuable suggestions. They suggested that we further strengthen the management and monitoring of raw material suppliers to ensure the stability and reliability of raw materials. They also emphasised the need for strict quality control at every stage of the production process to ensure consistency and reliability of our products. We attach great importance to our customers' suggestions and will adopt them seriously and make improvements. Through today's visit and exchange, we have established a good cooperation relationship with our customers, who highly appreciate and approve of UFINE 's production management and quality control. We will continue our efforts to improve product quality, strengthen technological innovation and provide better quality products and services to our customers. We look forward to future cooperation and jointly promoting the development of lithium battery industry.
Resources and going further
Thank you for reading. If you would like to buy battery products and learn more about batteries, please click on the links below.
Ready to play with some batteries? Here are a few of our products to checkout:
UFX 706090-3S 5000mAh
UFX 602030 300mAh 3.7V
UFX 606090 4000mAh 3.7V
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