Can Electric Vehicle Lead Acid Batteries Really Be Repaired? What Is The Reason Why The Lead-acid Battery Capacity Is Getting Smaller And Smaller? How Do Manufacturers Deal With Used Batteries When They Trade In Old?

Can Electric Vehicle Lead Acid Batteries Really Be Repaired? What Is The Reason Why The Lead-acid Battery Capacity Is Getting Smaller And Smaller? How Do Manufacturers Deal With Used Batteries When They Trade In Old?

Date:Feb 10, 2019

First answer the questions. The lead-acid batteries that are currently recycled on the market are generally refurbished by the recycler, or the original long-melt and re-smelted, so there is no repair at all. The next step is to answer the repair question in detail. The answer is yes, but the correct method must be used. Our lead battery used in electric motorcycles is not used soon, and the car runs for a short time. In fact, the battery is ineffective. There are two modes of failure: crystallizing the lead sulfate in the negative plate and softening the active material on the positive plate. The crystallization of lead sulfate in the negative electrode plate is mostly caused by water loss and undercharge during use, so that a coarse particle is formed on the surface of the negative electrode plate. We call it crystallization lead sulfate, which is also called irreversible lead sulfate. Salinization, commonly known as salinization, results in the surface salting of the negative plate. The charge acceptance is rapidly reduced, the electrochemical reaction becomes dull, and the normal charge and discharge of the positive plate cannot be matched. The discharge capacity is degraded and can no longer be used. Fortunately, with a special overcharge and pulse current method, more than 90% of the salified cells are generally activated. However, most of the batteries in the market are decommissioned during use, and the main reason for the capacity decline is the softening of the active material of the positive electrode plate. The active material of the positive electrode plate is accompanied by charge and discharge, and the mutual conversion of PbSO4 and PbO2 occurs. Since the space occupied by the PbSO4 molecule is larger than that of PbO2, the expansion and contraction of the active material of the positive electrode plate are generated, and gradually become soft or even fall off. , also known as active material softening, muddy. For this reason, most of the batteries returned on the market cannot be activated by a simple method of special overcharging and pulse current.

The active material softening of the positive electrode plate is a common disease in the use of lead storage batteries, especially power batteries and traction batteries, and is also a cancer of outdoor batteries, especially in the southern sub-temperate zone and the tropical region. Therefore, those repairing processes that were very hot in the past few years were only overcharged and pulsed. At most, some so-called repair liquids (actually only dilute sulfuric acid) were added, and it was only possible to solve the problem of crystallizing the negative electrode of the battery. Re-restoring the active material on the positive grid to the plate, so that the battery restores the normal electrochemical function of the active substance, can not be just "physical therapy", but also requires "chemotherapy". Specifically, the latest research found that by adding a nano-carbon polymer material, the functional material is embedded in a strong polar group and then mixed into the image of the oil phase colloid, statically amplified 150,000 times, the material structure is 10 nm spherical, and the oil-water two-phase is mixed. It has the ability to dissolve lead sulfate and respond to electric fields. Through a certain special charging program, it is possible to restore the active material of the plate.




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