Pretreatment method of copper insert of storage battery terminal

Abstract

The invention discloses a pretreatment method of a copper insert of a storage battery terminal. The pretreatment method comprises a treatment of dipping in a soldering flux and a liquid metal presoaking treatment, wherein the treatment of dipping in the soldering flux is performed by dipping the part to be cast of the copper insert in the soldering flux; and the liquid metal presoaking treatment is performed by soaking the copper insert dipped with the soldering flux in molten metal liquid of tin or terne metal. The pretreatment method of the copper insert of the storage battery terminal, disclosed by the invention, is simple to operate, and the copper insert is firmly bonded with a lead alloy; and a good fusion connection interface without gaps is arranged between the copper insert and the lead alloy in the storage battery terminal. According to the pretreatment method of the copper insert of the storage battery terminal, disclosed by the invention, the contact capability and the bonding strength between the copper insert and the lead alloy are improved, and the copper insert is less prone to flaking off; and the effective sectional area of current circulation is ensured, and the scrappage of a storage battery caused by the flaking-off phenomenon of the copper insert is simultaneously reduced.

Description

technical field [0001] The invention relates to the field of battery production, in particular to a pretreatment method for battery terminal copper inserts before being cast in a battery terminal casting mold in battery production. Background technique [0002] Valve-regulated sealed lead-acid batteries have the advantages of long cycle life, low self-discharge rate, safety and reliability, and low price, making them widely used in transportation, communication, electric power, UPS and other fields in recent years. Because batteries for high power output applications usually bear a large current load, a certain torque needs to be applied when connecting battery packs through busbars to fix the busbars and battery terminals with bolts to prevent contact resistance from increasing due to poor contact. As a result of the loss of electric energy and the arc phenomenon that may be caused by loose connections, usually a torque wrench is used to tighten the bolts at a certain torqu...

AI Technical Summary

Problems solved by technology

However, these two methods still have problems in actual operation. Method 1) there is a phenomenon of uneven distribution of the pre-impregnated lead-tin alloy layer on the surface of the copper insert, mainly due to the low surface energy of the surface of the copper insert during the tin immersion process. The corrosion protection layer is not completely removed, and there is still a local physical contact state in the subsequent casting process of lead alloy, which is equivalent to reducing the effective cross-sectional area of ​​current flow, resulting in an increase in pressure drop loss

Method 2) can only physically improve the torsion resistance of copper insert terminals, but cannot fundamentally solve the problem of molten contact between copper inserts and lead alloys

[0004] In addition, the invention patent 200910040017.9 mentions cleaning with metal cleaning agent, immersing in zinc chloride or dilute hydrochloric acid, immersing in tin after high-temperature alcohol washing, and then baking at high temperature, immersing in alcohol-soluble flux, plating lead-tin alloy, and casting into molds Lead-tin alloy, so as to achieve the purpose of improving the binding force between the lead-tin alloy and the copper insert; this process needs to go through multiple degreasing cleaning and drying, not only the process is complicated, but also zinc chloride and dilute hydrochloric acid contain highly active chloride ions , it is easy to cause penetrating corrosion of the copper itself; and, once the highly active chloride ions enter the battery electrolyte, it will cause serious self-discharge

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