How To Repair The Old Battery

Repairing old batteries is not difficult. It is very difficult to repair the entire set of old batteries (in series) at the same time (except for vulcanized batteries). As long as one battery in the battery pack is physically damaged, the effect of using the old battery to repair the instrument is not obvious, but the battery pack should be separated. Repair each battery individually, not only can detect the type of battery damage, but also can take different methods to repair, so the key to repair the old battery is to repair the single battery (usually 12v), briefly introduce several old batteries How to fix it:

1. Old battery impulse repair method:

The better way to eliminate vulcanization of old batteries is to use the pulse repair method. When repairing old batteries, the instantaneous voltage of the pulse is generally based on the functional requirements of the product, and the instant voltage is between 60v-300V. For example, the pulse voltage value of the product used to extend the battery life is not too large. It is specially due to the repair of the battery. The pulse voltage value of the product can be too large (if the pulse voltage value is too large, it will cause damage to the battery plate), the pulse voltage is high, the battery repair time is short, the pulse voltage is low, the battery repair time is relatively long, although the voltage at the moment of the pulse It is very high, but the average voltage is not high, it does not harm the human body and is very safe. 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 high-resistivity insulation, large lead sulfate crystals can also be broken down. If the high voltage is short enough and the current is limited, the charging current will not be large under the condition that the insulating layer is penetrated, and a large amount of gas will not be formed. The battery gassing capacity is strongly positively related to the charging current and charging time. If the pulse width is short enough and the duty cycle is large enough, the simultaneous micro-charging can be too late to form gassing while ensuring the breakdown of the coarse lead sulfate crystals. In this way, the pulse elimination vulcanization is realized.

There are special pulse generators on the market, but you should pay attention to choosing one with good effect. The resonance between the pulse and the battery plate is very important, which depends on the pulse frequency and amplitude. If the pulse frequency and amplitude are not enough, the effect of eliminating sulfuric acid crystallization will not be achieved. If the frequency and amplitude are too large, it will eliminate vulcanization and damage. Electrode plate, and the phenomenon of gas out; at the same time, there are many kinds of pulse waveforms, which can be displayed on the oscilloscope. A good pulse wave can effectively break down the insulating layer without damaging the battery and reduce the crushed sulfuric acid crystal powder into the electrolyte. It's like people crushing a rock. When facing a big rock, is it effective with a pickaxe or a hoe? You can tell at a glance.

2. The method of repairing the old battery with strong current:

The strong current repair method is a method of repairing the old battery with long-lasting high voltage or high current during charging, and it is mostly used when the effect of the pulse repair method is not obvious. First, high-voltage repair method: This method mainly uses a charging voltage 1.3-1.5 times the nominal voltage of the battery to repair the battery. For example, a 36V battery is charged with a 48V charger under the condition of the same or close to the charging current. , The charging time must be controlled and not too long, otherwise the battery will generate heat due to gas evolution. This method has a certain repair effect on the battery with short circuit and low degree of plate softening, but improper use can also cause damage to the pressure point of the battery plate. Second, the high-current repair method: This method mainly uses a charging current 1.5-2.0 times higher than the usual charging current to repair the battery. For example, a 20AH battery uses a 3-4A charger for charging. The advantages and disadvantages are related to "high voltage repair." Law" is the same.

3. Repair method of full charge and full discharge of the old battery:

The full charge and full discharge repair method is to fully charge the old battery and then completely discharge it to repair the old battery. The full charge and full discharge repair method mainly has a certain repair effect on the slightly damaged battery. At the same time, this method can also effectively activate the deep active material of the battery and increase the battery capacity. For example, lightly vulcanized batteries, batteries with higher internal resistance, the key of this method is to discharge fully, and to fully discharge each single battery, full charge and full discharge 1-2 times, the capacity of the battery Generally can be improved. The full charge and full discharge repair method should not be used frequently, at least once every six months, and at most once every three months.

4. Replenishment method of old battery:

The “water loss” of the battery can be repaired by replenishing water. The purpose is to dilute the sulfuric acid with increased concentration to carry out the electrolysis reaction normally. The water replenishment method is relatively simple. Just open the upper cover of the battery, you can see that there are six round holes, inject a certain amount of distilled water into each round hole, and soak for more than 24 hours. Water replenishment can only be supplemented with distilled water. Water with other ingredients, including pure water, cannot be added, because there are various metal molecules in the water of other ingredients, which may cause self-discharge and damage the battery after being added to the battery.

5. Re-matching and repairing old batteries:

An electric vehicle battery is generally a battery pack composed of several batteries in series. The damage of the battery is multifaceted, and there may be damage to the battery in several aspects at the same time: for the vulcanized battery, the use effect after repair is better; but for the extreme The battery with softened board and partition can be repaired immediately. Because it is a physical injury, the reusable value is not great, the use time after repair is also very short, and the effect of repair will be worse. The best way is to "replace the old batteries with little value for repairing (replace them with old batteries with more than 80% capacity)" and regroup them with the remaining batteries.

Batteries have a service life, and battery repair is only to keep it up to the normal design life. It is unscientific and unrealistic to promote battery repair products to repair batteries damaged by any factor like new batteries, and to ensure how many times the battery can extend its service life.