Casting process of plate grid of lead-acid storage battery

Abstract

The invention discloses a casting process of a plate grid of a lead-acid storage battery and belongs to the technical field of machining of the lead-acid storage batteries. The casting process comprises the following steps: preparing a plate grid alloy solution from the following components in weight percent: 0.946% of tin, 0.02% of lanthanum, 0.01% of yttrium, 0.01% of cerium, 0.003% of silver, 0.003% of manganese, 0.002% of barium, 0.002% of iron, 0.0015% of chromium, 0.0015% of silicon, 0.001% of potassium and 99% of lead; spraying a de-molding agent in a pre-heated mold cavity; casting by using a casting machine to prepare the plate grid. According to the casting process, by adding the tin, rare earth elements, the silicon and the potassium into the lead, the coefficient of thermal expansion is reduced, so that the plate grid is not easy to deform when being circularly charged and discharged; by adding the silver, the manganese, the barium, the iron and the chromium, the adhesion force between the plate grid and an active substance can be enhanced, so that the active substance is not easy to fall off, and deep charging and deep discharging capabilities of the storage batteries are facilitated and the circular charging and discharging service life is prolonged.

Description

Technical field:

[0001] The invention relates to the technical field of lead-acid battery processing, in particular to a casting process for lead-acid battery grids. Background technique:

[0002] With the rapid development of lead-acid battery technology and the continuous emergence of new materials and new processes, higher requirements are placed on the performance of lead-acid batteries such as water loss and overcharge resistance. Many domestic battery manufacturers also add additives such as selenium, sulfur, and arsenic to antimony-containing grid alloys to improve the corrosion resistance and hardness of the grid, improve overcharge resistance, and reduce water loss of the battery. However, due to the different dissolution temperatures of various additives in lead, their solubility is also different, and the different surface tensions of various additives will cause defects such as grid thermal cracking and shrinkage cavities. Therefore, it is necessary to optimize ...