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Battery Industry Cleaner Production Technology
- Mar 30, 2018 -

I Promote Technology

1. Button-free alkaline Zn/MnO2 non-mercury technology and equipment Key technologies for mercury-free button-type alkaline Zn/MnO2 batteries include battery steel shell structure and surface coating treatment, negative electrode mercury-free alloy zinc powder material, and positive electrode manganese dioxide material. Formulated with the electrolyte process, the mercury content is less than 0.0005%. The key indicators are leakproof and storage performance. The promotion of this technology can achieve mercury-free alkaline alkaline zinc-manganese batteries and reduce mercury consumption by 110 tons per year. The current annual output of button-type alkaline manganese batteries is more than 8 billion, of which 10% has reached no mercury.

2. Cardboard zinc-manganese battery mercury-free cadmium-free lead-free technology mercury-free cadmium-free lead-free cardboard zinc-manganese batteries, namely mercury, cadmium, lead content were lower than 0.0005%, 0.002%, 0.004%. The key points of this technology are the combination of anode zinc-alloy alloy components and mechanical processing performance, organic and inorganic additives, and slow-etching agents to replace mercury-inspired, electrolyte and positive electrode formulations. At present, the output of paperboard zinc-manganese batteries is approximately 18 billion, of which nearly 10% of products have been lead-free without mercury and cadmium. The promotion of this technology can use existing production lines to achieve lead-free mercury-free cadmium-free paperboard zinc-manganese batteries, reducing the annual consumption of 336 tons of lead, cadmium 118 tons, 4 tons of mercury.

3. Winding sealed lead-acid battery technology This technology adopts pressure-strength lead grid and wound electrode structure, which improves the large-current discharge performance and high-low temperature performance, improves the lead battery power density, and reduces the amount of lead consumed per unit of power density. /4. Winding sealed lead-acid batteries can replace existing start-up lead-acid batteries in the fields of general automobiles and construction vehicles, and can be used as power batteries in light hybrid electric vehicles and portable electric vehicles. At present, this technology has formed mass production capacity.

4. Manufacturing process technology and equipment for wire-drawing, punching, continuous casting and rolling lead-acid battery plates The positive and negative lead-acid battery plates are used as carriers for active materials. Lattice grid technology is the use of cold extrusion molding, can make the grid metal structure compact, significantly improved corrosion resistance, and the grid is thinner than other processes, reducing lead consumption, lead and lead slag emissions small. The new grid manufacturing technology also includes punching, continuous casting and rolling technology. At present, the above process is mainly achieved through the introduction of foreign technology and equipment to achieve large-scale production.

5. Cadmium-free technology for lead storage batteries The cadmium-free technology uses lead-calcium multi-element alloys or other cadmium-free grid-barrier alloys instead of cadmium-containing grid-bar alloys with cadmium content below 0.002%. The promotion of this technology can reduce the cadmium consumption by 1800 tons per year and eliminate the risk of cadmium contamination in the production, recovery and regeneration of lead batteries. Cadmium-free lead-acid batteries currently account for about 15% of electric bicycle batteries.

6. Internalization technology of lead storage batteries At present, some automotive starter batteries, electric bicycle batteries and other products use external chemical conversion processes to produce large amounts of acid mist and acid-containing lead-containing waste water. Promoting the internalization process of lead-acid batteries can greatly reduce the production of lead-containing acid-containing wastewater and acid mist, and reduce the discharge of lead-containing wastewater by about 6 million tons annually.

 

II Application Technology

1. The mercury-free technology of paste-type zinc-manganese batteries The paste-type zinc-manganese batteries are low-cost traditional products, with a total output of about 4 billion, which is characterized by the use of natural manganese dioxide or active manganese dioxide as the positive electrode, but the impurities of the material Too many to achieve mercury-free is very difficult. The mercury-free technology mainly includes improving the purity of the cathode material, adopting new materials, adjusting the electrolyte formula, replacing the mercury with the combination of inorganic and organic additives, and using the existing production line to realize the product without mercury. The promotion of this technology can reduce the annual consumption of mercury by 22 tons. The technology has been successfully developed and applied for demonstration.

2. The lead-acid battery plate is converted into a water-washing process after the external plate is converted into lead-acid battery plate, resulting in a large amount of lead-containing acid-containing waste water. Lead-battery plates are chemically converted into a water-free process. Special treatment fluids are used. Discharge and anti-charging methods are used to treat the plate. The plate can be converted into water-free, and lead-evaporation can be reduced by 90%. At present, this technology has been successfully developed and has pilot application conditions.

III Research And Development Technology

1. Research and development of silver oxide batteries Non-mercury technology Silver oxide batteries are mainly used in high-end electronic watches and electronic instruments. The mercury content is about 1% of the battery weight, but it directly enters the environment after being discarded, and there is a risk of contamination. In the absence of silver oxide battery recycling processing mechanism, we must start from the source, accelerate the development of new types of zinc powder alloys, mercury substitutes, electrolyte process recipes and battery steel shell structure and surface treatment process technology to achieve silver oxide batteries without mercury Change.

2. Research and development of new lead-acid battery technology The development direction of new-type lead-acid batteries is to reduce lead consumption, improve battery mass energy density, quality power density, cycle life, and quick charge capability. The current focus on high-performance electrode materials and preparation methods, research new battery structure and manufacturing process, improve energy density and power density. New lead batteries include bipolar sealed batteries, super batteries, and graphite foam batteries, among which: (1) Bipolar sealed batteries. The battery adopts a bipolar structure and is made of a new type of ceramic material. Compared with conventional batteries, the battery consumes less lead, is light in weight, and has a small size. With long cycle life, high charge and discharge efficiency, cheap, easy to recycle and so on. (2) Super battery. Carbon is partially or totally substituted for lead in the negative electrode. This type of battery has the characteristics of long cycle life, high charge rate, good power characteristics, excellent low temperature performance, light weight, etc., and can be used as a power source for electric vehicles. (3) Foam graphite battery. The technological innovation of the foamed graphite grid sealed battery is to abandon the lead grid, retain the active material, replace the lead with foamed graphite, and reduce lead by 70% compared with ordinary lead-acid batteries.

3. Research on lead reduction technology of power lead-acid batteries and selection of lead-reducing additives and de-sulphation additives to reduce the polarization of the discharge process of lead-acid batteries, overcome the sulfation of the surface of plates, reduce the internal resistance of batteries, and improve the power characteristics of lead-acid batteries. The capacity of lead-acid batteries such as start-up and high-power use is reduced, and lead consumption is reduced by more than 10% on an existing basis. Lead reduction technologies include ultra-thin plate processes. The technology has matured in foreign countries. At present, China is still in the research and development stage.

4. Recycling and regeneration technology of spent lead-acid batteries. At present, the key technologies for the recovery and recycling of used lead-acid storage batteries mainly depend on imports. It is necessary to increase the research and development of core technology and equipment with independent intellectual property rights in mechanical crushing, sorting, lead paste desulphurization, and lead regeneration, and to develop waste water, waste gas, and waste residue pollution. Integrated control and utilization of technical equipment to achieve the recycling of used lead-acid batteries.