Diaphragm is one of the important inner members in the structure of lithium battery. The characteristics of the diaphragm determine the page structure and internal resistance of the rechargeable battery. It immediately endangers the capacity, circulation system and safety factor of the rechargeable battery. Excellent diaphragm characteristics are the key element to improve the comprehensive performance of rechargeable batteries.

The technical difficulty of the diaphragm depends on the hole-making processing technology and the preparation of the plate. The hole making engineering design includes the pulse damper hole making process, production line equipment and product reliability. The key scientific research is the preparation of polypropylene, high-pressure polyethylene raw materials and preservatives and the processing technology of modified materials. Insufficient porosity, uneven thickness and poor compressive strength are difficult problems in the design of pore-making engineering.
The role of lithium battery diaphragm:

The key role of the diaphragm in lithium-ion batteries is reflected in two levels:

First, ensure the safety factor of rechargeable batteries. Diaphragm materials must first have excellent dielectric strength to avoid short-circuit failures caused by positive and negative touches or short-circuit failures caused by burrs, particles, and crystals. Therefore, the diaphragm must have a certain degree of tensile strength. Compressive strength, not easy to tear, and long-term maintenance specifications based on sudden high temperature standards, it is not easy to produce shrinkage, resulting in large-scale short-circuit failure and uncontrollable heat.

Second, the other is to provide a safe channel for lithium-ion batteries with a microplate with charging function and multiple characteristics. Therefore, the diaphragm must be a plastic film with high porosity and well-proportioned microplates. The transfer of lithium-ion batteries in rechargeable batteries is constrained by the characteristics of the raw materials themselves and the porosity characteristics after demulsification, which is mainly manifested in the technical parameters, that is, the positive ion oxidation-reduction potential.

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