Pole sheet roll requirements:
High wear resistance: the roller is subjected to abrasive wear, adhesion wear, fretting wear in the process of work, the wear resistance is not enough, not only affect the precision of the roller surface and the quality of the pole piece, but also reduce the production efficiency;
High density: dense structure, low porosity, high corrosion resistance, also conducive to prevent pole coating and other foreign matter into the roller surface;
High precision: the straightness, ellipticity and coaxiality of the roller are required to be high, otherwise it will cause uneven thickness of the battery electrode and poor binding force.
The company uses HVOF thermal spraying technology to prepare multi-component cermet composite coating on the surface of high precision roller of lithium battery, which has the following characteristics:
1, High coating hardness, microhardness up to 1100-1400HV0.3, with very high wear resistance;
2. The coating structure is uniform and dense, with low porosity, (<0.6%), and does not stick to materials, and does not react with battery electrode material;
3, the coating bonding strength is high, using FM1000 adhesive test, can reach more than 90MPa.
4. Subsequent grinding by high precision CNC grinder to ensure the straightness, ellipticity and coaxiality of high precision roller, which is less than 0.002mm
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