Grid, manufacturing method thereof, pole plate and lead-acid storage battery

Abstract

The invention relates to the field of storage batteries, and discloses a grid, a manufacturing method thereof, a pole plate and a lead-acid storage battery. The grid comprises a tab, a frame and a plurality of conductive ribs staggered in the frame to form a mesh structure; the frame is higher than the mesh structure in the thickness direction of the mesh structure, so that lead paste can fill theframe with the mesh structure as a support; the frame comprises an upper beam and side frames, wherein the upper beam is arranged along one side edge of the mesh structure and is made of a lead alloymaterial; the side frames are connected with two ends of the upper beam and are made of a plastic material; the side frames and the upper beam jointly form the frame surrounding the mesh structure; and the tab is connected with the upper beam. According to the grid, the manufacturing method thereof, the pole plate and the lead-acid storage battery, the grid has high strength and high creep resistance and is not easy to deform, and the active lead paste filling the frame is not prone to falling and being contaminated; and meanwhile, the weight and size are small, so that the cost is favorablyreduced and the usage performance of the product is favorably improved.

Description

technical field [0001] The invention relates to the field of accumulators, in particular to a grid, a manufacturing method thereof, a pole plate and a lead-acid accumulator. Background technique [0002] Since its birth, lead-acid batteries have been widely developed due to their high cost performance, high safety and reliability, and recyclable characteristics, and have been better applied in the fields of electric vehicles and communications. However, due to the use of heavy metal lead in traditional lead-acid batteries, the battery weight and volume are relatively large, which seriously affects its application in many fields. [0003] In order to solve this problem, many technicians consider using other corrosion-resistant alloys to replace the positive and negative lead alloys in terms of the positive and negative grids (collectors) of the battery. Among them: some technicians use metal titanium to replace the lead alloy, but Due to the high price of titanium metal and ...

AI Technical Summary

Problems solved by technology

However, due to the use of heavy metal lead in traditional lead-acid batteries, the battery weight and volume are relatively large, which seriously affects its application in many fields.

[0003] In order to solve this problem, many technicians consider using other corrosion-resistant alloys to replace the positive and negative lead alloys in terms of the positive and negative grids (collectors) of the battery. Among them: some technicians use metal titanium to replace the lead alloy, but Due to the high price of titanium metal and the weak bond between the surface of titanium metal or alloy and lead, the service life cannot be guaranteed, and basically no one actually applies it to the product; there are also technicians who use plastic or conductive plastic surface to plate lead alloy instead of lead alloy. , and the difficulty of electroplating lead alloys on plastics is relatively large, the coating is not well bonded, ordinary plastics are not conductive, and conductive plastics are also very limited in conductivity, and the price is high, which leads to the failure of this technical route; some companies in the United States use foamed graphite Instead of the grid (collector), the combination of foamed carbon and lead is poor. Some technicians use electroplating technology to electroplate lead alloy on the surface of graphite. The electroplated coating is closely combined with graphite, so it can solve the problem of the combination of active material and foamed graphite collector. However, due to the high cost of foamed graphite and electroplating, and the inability to save more lead materials, the cost remains high and it is difficult to be popularized and applied; some people use copper grids to electroplate lead and lead-tin on large batteries The alloy is used as the negative electrode grid (current collector), but the price of copper is high, and it can only be used when the cost is not considered (submarine battery), and it cannot be applied to the positive electrode (due to the oxidation of the positive electrode)

[0004] In addition, there is also a bipolar plate made of a grid with a mesh structure, which has low strength (relatively soft) and is easy to deform, and the active material (lead paste) filled on the mesh structure is easy to fall off and cause a short circuit; Moreover, this kind of pole plate is on the grid of the same mesh structure, including the positive electrode plate and the negative electrode plate. It is necessary to fill the positive electrode active material and the negative electrode active material at both ends of a network structure, and the active material is easy to cross-contaminate. And the thickness of positive and negative active materials is generally the same. According to the experience of industry technicians, the weight of positive and negative active materials should be different, and the attenuation speed should be different. According to normal conditions, the thickness of the positive plate should be greater than the thickness of the negative plate. Well-matched, there is a problem that the active material cannot be fully utilized. At the same time, it is difficult to seal and isolate the battery cells using this bipolar plate. If it is not solved, it will lead to quality problems such as short circuit and corrosion caused by series cells.

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