Electromagnetic low-pressure casting device and method for lead-acid battery grid

Abstract

The invention discloses an electromagnetic low-pressure casting device and method for a lead-acid battery grid. The electromagnetic low-pressure casting device comprises a grid casting mold and a heat preservation furnace arranged at the bottom of the grid casting mold, a mold cavity of the grid casting mold communicates with the heat preservation furnace through a liquid rising pipe, the bottom of the liquid rising pipe is located below the liquid level of molten lead in the heat preservation furnace, a pressurizing system is used for pressing the molten lead in the heat preservation furnace into the mold cavity through the liquid rising pipe, and a magnetic field generating device is used for applying an electromagnetic field to the molten lead in the mold cavity. According to the electromagnetic low-pressure casting device and method for the lead-acid battery grid, the electromagnetic field is applied in the low-pressure casting process of the grid, and the corrosion resistance of the grid is further improved through the grain refinement effect and the segregation reduction effect of the electromagnetic field.

Description

technical field [0001] The invention belongs to the technical field of lead-acid battery grid preparation, and in particular relates to an electromagnetic low-pressure casting device and method for a lead-acid battery grid. Background technique [0002] The grid is the main component of the lead-acid battery. It is the current collector skeleton of the electrode, which plays the role of conducting, collecting and making the current evenly distributed. At the same time, it supports the active material and is the carrier of the active material. Due to the shape and size characteristics of the grid, and considering the production cost, most of the grids are currently produced by ordinary water-cooled metal mold casting. The process simply pours the lead melt into the grooves of an open water-cooled metal mold, and completes the solidification without feeding the lead melt. The process is relatively simple and the production efficiency is high (≤16 pieces / min). However, due to ...

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Problems solved by technology

The process is relatively simple and the production efficiency is high (≤16 pieces / min). However, due to the serious shortage of shrinkage during the solidification process of the grid, there are serious shrinkage and shrinkage defects within a certain thickness range of the upper and lower surface layers of the grid, and some shrinkage porosity The shrinkage cavity extends to the surface of the grid, forming defects similar to surface microcracks

In addition, due to the existence of alloying elements, there are relatively serious microsegregation and compound inclusions in the solidified structure.

The above solidification defects will lead to a decrease in the corrosion resistance of the grid, which will seriously affect the service life of the lead-acid battery

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