Mercury free mechanical equipment and tooling mould for alkali manganese battery

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Mercury free mechanical equipment and tooling mould for alkali manganese battery

Mercury free mechanical equipment and tooling mould for alkali manganese battery

The most used positive and negative electrode preparation equipment is still pharmaceutical machinery, including powder mixing, rolling or slitting, granulation, screening and zinc paste preparation. The equipment mainly has the following problems:

(1) Tooling, mould and mechanical equipment do not pay attention to the corrosion resistance, stability and wear resistance of materials, especially domestic equipment. Although stainless steel and other high-grade materials are used for mixing barrel, roll and zinc paste container, they still do not meet the requirements of mercury free. Ordinary stainless steel has poor corrosion resistance, oxidation resistance and wear resistance. Fe, Mo and other elements in the anode of mercury free alkaline manganese dioxide battery are controlled by 10-7 ~ 10-6. Material corrosion, electrochemical reaction and mechanical factors are easy to cause the anode impurity elements to exceed the allowable value. The anode preparation equipment of Korean rocket company has been comprehensively considered to meet the needs of mercury free, which is worthy of reference. The inner wall of its mixer is coated with wear-resistant non-metallic materials, and the machinery and containers contacting zinc paste are all made of engineering plastics, completely avoiding the mixing of metal impurities.

(2) The rate of genuine products is low and the cross pollution is serious. From mixing powder to screening qualified powder particles, the primary granulation rate of general equipment is only about 65%, and 2 / 3 are unqualified products, which need to be recycled in several machines again and again, which increases the cross pollution of positive powder. The powder treatment system in Europe and America has a primary granulation rate of 65% ~ 80%, which greatly reduces the wear of equipment and the cross pollution of powder particles.

(3) The transmission (rotating) part of some equipment uses harmful metals such as copper. The positive electrode of mercury free alkaline manganese dioxide battery is particularly sensitive to copper. The mixing of copper and other impurities into the positive electrode powder is a hidden danger of chronic short circuit of mercury free battery.

(4) Under the condition of alkaline medium, the drying process is easy to cause carbonation of cathode powder and cross pollution. High carbonate concentration is one of the factors causing alkaline creepage of batteries. Mercury free alkaline manganese dioxide batteries have higher requirements for carbonate concentration.

(5) The negative collector assembly mainly depends on the intermittent processing mode of manual and mechanical in China. On the one hand, the product quality is greatly affected by human factors. On the other hand, this processing method can not meet the requirements of mercury free. This is also one of the difficult problems that mechanical equipment needs to solve as soon as possible. The welding method of current collector pin and negative electrode bottom is also worth studying. DC energy storage explosive welding is widely used. This welding is easy to cause copper powder to not pollute the current collector assembly, which is an important hidden danger of chronic short circuit of mercury free alkaline manganese dioxide battery. The imported negative collector assembly equipment needs hundreds of thousands or even millions of yuan. The battery machinery factory should pay attention to the research and development of the equipment, which is also an important link to improve labor productivity.

The assembly equipment mainly has the problems of poor die material, non wear resistance, serious dust pollution and so on. The machinery factory shall strengthen the cooperation with the metal material research department to select the applicable positive ring die materials and heat treatment methods.

【Energy network】

Mercury free mechanical equipment and tooling mould for alkali manganese battery_Alkaline manganese battery