Square winding structure lead-acid battery and manufacturing method thereof

Abstract

The present invention is a lead-acid storage battery with a square winding structure and its manufacturing method. The positive and negative active materials are respectively coated on the flexible grid obtained by expansion, punching, continuous casting or other forms to make positive and negative plates. Plate, separator, and negative plate are wound on the same core plate to form a battery core, and the battery core is placed in a battery tank with a circular arc transition at both ends and a straight line in the middle. After drying by a special process, casting welding, sealing, and filling are completed. A series of physical and electrochemical processes such as acid and chemical formation, and finally, it becomes a lead-acid battery that can be used repeatedly for charging and discharging. The invention combines the advantages of cylindrical winding batteries and traditional square flat batteries. It not only has the characteristics of low internal resistance, high specific power and long life of winding batteries, but also has the characteristics of high volume utilization rate and wide application range of traditional batteries. It breaks through It overcomes the limitation that the cylindrical winding battery is only suitable for small and medium capacity batteries, and has broad application prospects.

Description

technical field [0001] The invention relates to a lead-acid storage battery and a manufacturing method thereof, in particular to a lead-acid storage battery with a square winding structure and a manufacturing method thereof. Background technique [0002] Lead-acid batteries are currently widely used in various fields of the national economy, and wound cylindrical batteries are the best among them. It uses expanded mesh grids, wound into single cells and connected in series through external welding. [0003] The wound cylindrical battery published in patent 98202241.7 adopts expanded mesh grid. This patent adopts a wound cylindrical structure, which enhances the anti-deformation and anti-vibration capabilities of the plate, avoids short circuit caused by active material falling off, adopts cylindrical shell, battery box The strength is greatly improved, the opening pressure of the vent valve can reach up to 10 times that of the traditional battery, and the water loss is extre...

AI Technical Summary

Problems solved by technology

However, compared with the square flat battery, it also has the following limitations: since the positive and negative terminals are on the same end face, the tab distribution of the positive and negative electrodes must be strictly controlled in different fan-shaped areas; Similarly, the result is that the capacity of each layer is inconsistent, the current distribution of each layer is uneven, and the current that each tab bears is inconsistent. The tab that bears a large current is easy to corrode and break, resulting in premature failure of the battery. This phenomenon is more obvious, so the method described in this patent is only suitable for small and medium capacity batteries, not for large capacity batteries

However, since the monomers are only separated by paraffin, the self-discharge is large, and it is difficult to store, and the self-discharge between the monomers increases the corrosion rate of the lead wire, resulting in shortened life; all monomers share a vent valve , gas channeling and short circuit between the monomers are easy to affect the charging efficiency; fixtures are required to fix after winding, and the space utilization rate is reduced; other monomers are wound at the same time, the equipment is complicated and self-contained, and it is not compatible with the existing manufacturing system. technology is difficult to implement

[0005] Whether it is the winding cylindrical battery disclosed in patent 98202241.7 or the quasi-bipolar winding structure lead-acid battery disclosed in patent CN200520018832, they are all cylindrical windings, and the cylindrical containers cannot be seamlessly connected like square containers. In terms of space, the space utilization rate of cylindrical wound batteries is low, and cylindrical wound batteries are not suitable for occasions where the length and width of the battery cells are greatly different. Because of this, although cylindrical wound batteries have excellent performance, they are not not widely used

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