How To Fix The Battery Vulcanization Problem?

During the use of the battery, the battery vulcanization phenomenon will occur, which will soften and corrode the positive and negative plates of the battery, causing the battery to fail, that is, the working performance is drastically reduced or cannot be used. So how to fix the battery vulcanization problem? Let’s take a look.

There are several ways to eliminate vulcanization of batteries, each with its own characteristics.

1. Hydrotherapy to repair battery vulcanization

If the battery vulcanization is not too serious, you can use a thinner electrolyte with a density below 1.100g/cm3, that is, add water to the battery to dilute the electrolyte to improve the solubility of lead sulfate. With a current of less than 20h, charging for a long time within the range of liquid temperature of 30℃~40℃ may be restored. If the electrolyte density is high, only water decomposition will occur during charging, and the active material will be difficult to recover. About sealed batteries In other words, hydrotherapy is impossible. In addition, the cost and working hours of hydrotherapy are relatively large. Now that there is a pulse repair method, hydrotherapy is rarely seen.

2. Chemical treatment method to repair battery vulcanization

Chemical additives are used when the battery is vulcanized. This method is effective for eliminating vulcanization, but its side-use cannot be ignored. The important problem is that it will form a significant increase in self-discharge, so ordinary battery manufacturers dare not use.

3. High current charging to repair battery vulcanization

If adsorption is considered to be the cause of sulfation, high current density can be used for charging (up to 100mA./cm2). Under such a current density, the negative electrode can reach a very negative potential value.At this time, it is far away from the zero charge point, making φ-φ(0) 0, changing the sign of the charge on the electrode surface, and the surface active material will desorb, especially For anionic surface-active substances, after this harmful surface-active substance is desorbed from the surface of the electrode, the charging can proceed smoothly. At present, almost no one in China uses this method to deal with irreversible sulfation, which may be due to the following considerations : Polarization and ohmic voltage drop are newly added under high current density. This part of energy is converted into heat, which increases the internal temperature of the battery. At the same time, a large amount of gas is precipitated, especially the positive electrode is a large amount of gas, which is easy to activate. Material shedding. d. Pulse repair

According to the principles of atomic physics and solid state physics, sulfide ions have five different energy levels. Usually, the ions in the metastable energy level tend to move to the most stable covalent bond energy level. At the lowest energy level (that is, the state of covalent bond energy level), the sulfide ion contains 8 atoms in the form of a ring molecule. The ring molecule pattern of these 8 atoms is a stable combination that is difficult to be broken and forms an irreversible battery. Sulfation-vulcanization. When this happens many times, a layer of lead sulfate crystals similar to the insulating layer is formed.

To break the bondage of these sulfate layers, it is necessary to raise the energy level of the atoms to a certain degree. At this time, the electrons added to the outer atoms are activated to the next higher energy band, so that the bond between the atoms is released. Each specific energy level has a unique resonant frequency, and some energy must be supplied to enable the activated molecules to migrate to a higher energy level state. The energy is too low to meet the energy requirements for the transition, but, too The high energy will make the atoms that have been freed from the bondage and transition in an unstable state, and then fall back to the original energy level. In this way, it is necessary to pass multiple resonances to make one of them break away from the constraint and reach the most active energy level state without falling back to the original energy level, so that it is converted into free ions dissolved in the electrolyte and participates in the electrochemical reaction. .

Very high voltage can be achieved, which is the method of high current and high voltage charging, and resonance can also be achieved, which is the method of pulse harmonic resonance.

In terms of solid physics, any insulating layer can be broken down at a sufficiently high voltage. Once the insulating layer is broken down, the coarse lead sulfate will assume a conductive state. If an instantaneous high voltage is applied to the insulation of high resistivity, the large lead sulfate crystal can also be broken down. If the high voltage is short enough and the current is limited, the charging current is not large under the condition of breaking through the insulating layer, and It will not form a large amount of gas. The battery has a strong gassing capacity, which is related to the charging current and charging time. If the pulse width is short enough and the duty cycle is large enough, it can be guaranteed to break down the coarse lead sulfate crystals at the same time. The charging is too late to form gas. In this way, the pulse elimination vulcanization is realized.

The method of realizing pulse elimination vulcanization and inhibiting battery vulcanization can generally be handled by pulse protectors and repairers. Generally, two types of repair methods are used. One is online repair, and the protector that can appear pulse source is connected in parallel to the positive and negative of the battery On the pole, if you use battery or charger power or use external city power, pulses will be output to the battery. This repair method requires very little energy and is slower, but because it is connected in parallel to the battery pole 2 end all the year round It does not matter if it is slow. Regarding the battery without vulcanization, the vulcanization of the battery can be suppressed.

Second: it is off-line, can appear fast pulses, the pulse current is relatively large, the pulse frequency is relatively high, and the pulse duty cycle is relatively large. Some products also have automatic control. This repair instrument is mainly used Repair the vulcanized battery.