Precast piece for busbar of storage battery and method for welding same with polar plates of storage battery

Abstract

The invention provides a precast piece for a busbar used in a high-capacity lead-acid storage battery, parallelly connecting polar plates with the same polarity in the storage battery and leading the polar plates to electrode terminals. The precast piece comprises a connecting main board which is respectively welded with lugs of the polar plates of the storage battery; the connecting main board is strip-shaped; the middle of the connecting main board is provided with a post vertical to the connecting main board; and a pectinate material preparing threaded rod is extended along the lateral surface of a longer side of the connecting main board. Due to the existence of the pectinate material preparing threaded rod, the precast piece for the busbar can greatly reduce the melting time of workpieces and the feed amount of alloy solder in the welding, can complete solder sides for one time in short time, can reduce the air contacting opportunity of a lead alloy to the utmost, ensure the quality of weldments, and ensures that the busbar has compact structure to prolong the service life of the storage battery. The invention also provides a method for connecting the precast piece for the busbar and the lugs of the polar plates of the storage battery, which has simple operation and can obtain good welding quality by means of the prior welding conditions.

Description

technical field [0001] The present invention relates to a busbar, in particular to a precast part of a busbar, and more particularly to a busbar used in a large-capacity lead-acid battery to connect the inside of the battery with the same polarity plates in parallel and lead them to the electrode terminals. Precast. The invention also relates to a method for welding the bus bar pre-casting and the tabs of the battery plates. Background technique [0002] Lead-acid batteries usually include a battery case, a battery cover, and a single or multiple pole groups in the battery case. The pole group includes multiple overlapping positive and negative plates and a separator for separating the positive and negative plates. There are lugs on the top of the positive and negative plates, and each lug is connected to the bus bar pre-casting by welding to collect the current to the electrode terminal. The bus bar pre-casting of the existing lead-acid battery generally includes a connec...

AI Technical Summary

Problems solved by technology

For large-capacity lead-acid batteries above 200A, the busbar needs to carry a large current for charging and discharging. The thickness of the busbar is generally between 5-10mm, so the welding layer for fixing the tabs also needs the same thickness. The welding section needs a relatively long welding time. Therefore, during the welding process of the large-capacity battery bus bar pre-casting and the tab, various alloy elements are easily oxidized, and this bus bar with an oxide layer is full of acid. It is very easy to be corroded in the foggy environment, which will cause loosening of the welding surface of the tabs and make the battery scrapped early

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