Battery dry manufacturing - Introduction to BDM technology

￮ Dry process is a new type of lithium-ion battery manufacturing process, the principle is to use the binder's fibrotic ability to build a continuous and stable binder network inside the electrode or electrolyte, and prepare the electrode or electrolyte into a self-supporting film. No solvent is used in the process of dry process, and the processes of slurry preparation, coating, drying and solvent recovery are canceled, which reduces the equipment and site input of these processes, and greatly reduces the production cost.

￮  High energy battery dry manufacturing process - BDM has now achieved the continuous manufacturing of positive/negative electrodes and solid electrolyte films at the meter level, which is more suitable for the manufacturing requirements of all-solid-state batteries. In addition, the high energy digital manufacturing has now opened up the sulfide electrolyte with PTFE, fibrosis preparation, feeding, ultra-thin film, electrode composite, atmosphere protection and other whole process preparation scheme, can achieve the efficient preparation of sulfide all-solid-state battery.

￮ Compared with the traditional wet process, the dry process is simpler, the equipment covers a smaller area, the manufacturing cost can be reduced by 18%, and it is more suitable for the large-scale production of pole sheets.   Secondly, the dry process improves the compaction of the active material, and the energy density can be increased by 20%. ; The cycle performance, durability and impedance of dry process batteries are better under laboratory conditions.

Technological advantage

Continuous and efficient composite process of dry electrode film and electrolyte film

￮ In the material fibrosis stage, relying on the self-developed material fibrosis preparation equipment, the temperature and speed of the fibrosis equipment can be accurately controlled, and the efficient completion of the process of uniform mixing, high-speed shear, fiber network strengthening and efficient uniform granulation can be achieved, which greatly improves the structural uniformity of the electrodes and electrolyte films produced in the subsequent steps.

￮ Secondly, for the preparation needs of sulfide all-solid-state batteries, the equipment is small in size, can be freely operated in the glove box, and the minimum starting amount of material use is only 10-20g, which greatly reduces the cost of preparing sulfide all-solid-state batteries in the laboratory.

￮ The device takes only 3-5 minutes to make the PTFE material form a continuous phase fibrotic network with high speed, high efficiency and good uniformity.

￮ In the film composite stage, high energy dry electrode film preparation and composite equipment can achieve continuous and efficient film formation of electrode materials, composite with fluid collection, and can prepare 70-500 micron electrode sheets.

￮ The sulfide electrolyte film preparation equipment can continuously produce the sulfide electrolyte film with a thickness of 20 microns. Both are equipped with a high-precision rolling system to ensure that the thickness uniformity of the diaphragm is less than 2 microns.