This is a very important issue, and the hydrolysis alloy in the production of conventional lead-acid batteries does not need to be added. In addition, some people say that the welding of DZM batteries make some corrections with the same alloy as the grid.First, the alloy of lead-acid batteries is first, and the negative electrode is lead calcium tin aluminum. The positive extremely lead-toch cadmium, the positive electrode alloy is similar to the melting point of its ingredient, especially the presence of antimony, so the melting point is close to the low bismuth alloy 270 ¡ã C, which does not affect the welding. However, the negative pole is different, because the melting point of each element in the four-yuan alloy of the negative electrode is: lead melting point 327 ¡ã C, calcium melting point 839 ¡ã C, tin melting point 231 ¡ã C, aluminum melting point 660 ¡ã C, then explain the lead group Alloy, the so-called lead-based is lead-based, other small or micro-elements made of synthetic metals made of trace elements. Battery production technology - Necessity of lead calcium battery welding rod plus
As can be seen from these metals, the difference in melting point is very large, and it is impossible to melt at the same heating conditions. The high melting point metal is oxidized in a high temperature state, and the surface is formed by the surface of the oxide film when approaching the melting point, and the melting point of most metal oxides is twice the original metal. It is impossible to mean it again.
When it comes to the melting process, the two opposing high melting metals contained in the plates are melted when the alloy is melted, but is dispersible. Because as an overall referred to, as a unit, calcium and aluminum still present, the calcium and aluminum at this time can be referred to as the non-melt in the low melting point metal melt. The stretching and fluidity of pure lead itself is very good. If the elements such as bismuth and tin are not added in pure lead, it is not possible to produce a pure lead production battery, but the grid is die casting). The electrode is the main filler of the bus bar, and the plate ear is about 1/3. The action of the bus bar is to join in panel of unified polarity in a pole and transmits the power transmission of these poles by bus. Go to the outside circuit.
The melting point of lead tin alloy is 183 ¡ã C, and the melting time of the lead tin alloy is more than the pure lead under the same temperature conditions. Here is a problem: low melting point metal, no high melting metal in the electrode, There is no oxidation problem, but the plate is a high melting point metal. The oxidation process of the plate ear: When the solder flame is mixed into the plate, there is a process of melting, high melting metal oxidation, but it must be noted that the oxidation speed in the oxygen in the oxygen is. Extreme. Because of the presence of aluminum in this alloy, the purpose is to prevent the loss of calcium during molten state. Therefore, there is a requirement for the amount of low melting point metal, and the purpose is to integrate with the welding rod alloy in a relatively unified period of time.
It can be understood that as long as the melting body of the welding rod alloy can reach a plate ear in the first time, it will not appear for false welding. However, when the welding technology is not mature (flame. Time. Time mastering) The false welding is still there. Based on this reason I think it is necessary to apply soldering to our current stage. Explain the so-called positive and negative electrode-specific alloy, this dedicated refers to the alloy of the positive and negative plate gate, and the positive electrode can be used as a plate gate alloy. The negative is impossible. It is not soldered at all. When the total alloy ratio is high calcium low tin, the amount of the welding rod alloy tin is 2%, and now the addition of tin is 0.8% to 1%, less this amount. The low total melting point metal in the dissolved cell during welding, resulting in uneven welding quality.
In addition, the calcium in the cadmium and negative electrode in the positive electrode can not be mixed together, the two metals are simply unable to formulated into an alloy, and the two components can cause metal texture to evacuate, in practice if the positive electrode alloy mixed in practical applications In the negative electrode alloy, the bus row is smashed, and the battery quality is caused.
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