VRLA batteries four conditions of a hermetic seal

Well known in the battery manufacturing process , tight sealing is to prevent the battery from the loss of moisture during storage and decrease in capacity , to prevent the green copper cap and ensure that no water in the use of the important measures grout . Tight vehicle cargo seal with the battery discharge level of performance , leak-proof performance and storage performance solidarity . Sealing the battery to prevent intrusion of oxygen in the air inside the battery , accelerated corrosion of zinc . Therefore , in order to ensure the quality of the battery , it is necessary to strengthen seal.
When they meet the following four conditions , sealed VRLA batteries can be achieved .
1 ) Negative grid with no antimony lead-calcium alloy to improve the cathode overpotential , which is to improve gas precipitation threshold voltage , according to estimates using lead-calcium alloy than the low antimony alloy high 200mv precipitation gases. Inhibiting the precipitation of hydrogen , with a certain internal pressure . And there is a very strong corrosion resistance.
2 ) using a special one-way valve , the internal pressure of the battery to maintain a certain balance , and to suppress the outside air (O2) from entering the battery negative grid corrosion , trailer seals the valve opening pressure of 18-23Kpa, valve closing pressure of not less 8Kpa, and there filter acid tablets to maintain a certain electrolyte concentration .
3) The porosity of more than 90% ultra-fine glass fiber separator , a certain amount of adsorption of the electrolyte , to lean solution design , and sufficient gas passage , the gas can internally complex .
4) The negative plate active material 10% excess , of oxygen is sufficient to precipitate the composite positive electrode , the negative electrode reaction is always in charge , to prevent hydrogen and salinization .