Can dry battery add water? What is the result after adding water?

Dry batteries can be charged with water.

Consumers buy dry batteries are generally in the dry state of charge of the battery , i.e. the battery is in the plates with electricity, only the description or the manufacturer's instructions, adding a certain concentration of the aqueous sulfuric acid i.e., battery Water, while charging, can activate the dry battery. The battery water density after completion of charging should be the density recommended by the manufacturer. If not, it is necessary to add pure water or sulfuric acid for fine adjustment.

After the above steps are completed, the battery can be used normally.

During use, be careful not to overcharge or over discharge, and do not lose liquid. These three points have a great impact on the battery life.

This post in the WeChat circle of friends said that the battery life can be extended by injecting battery water into the old battery of the electric vehicle through a syringe. The post details the seven steps of the specific operation, and only one screwdriver, one electrician's pliers, one hair dryer, and one bottle of battery water sold in the hardware store are required for such an operation. As of February 8, the reporter saw that the forwarding amount of the post has reached 100,000+, and was praised by nearly 3,000 people.

Many netizens said that this is the gospel of electric vehicle users. Finally, it is not necessary to change the battery frequently. Two yuan can solve the problem, and some troubles are worthwhile. Some netizens are also skeptical about this. Netizen @Haitian Huiying: "Recharge the battery after full of water, which may lead to explosion!" One of the netizens said that they have tried, "completely chicken ribs, extended for less than a week, completely scrapped, tell you, definitely not and the same as the new one."

At 8 o'clock on February 6th, it was at the early peak. At the sports road in the inner ring road of the provincial capital, the reporter interviewed ten people who were riding electric vehicles. Six of them said that the move was not scientific and would not be tried. "Is this a fake? If it is true, can the electric vehicle battery manufacturer not close the door?" A Li surnamed the public expressed doubt. However, some members of the public have expressed interest in trying: "Since this is said, I think it should be feasible. When my battery pack is about to retire, I have to try it. It is best, no matter what, and then the old battery will be lost."

experiment

Old batteries that are charged with battery water drop faster when discharged

At 9 o'clock on February 6, the reporter took a battery water purchased from Auto Parts City and a 20 ml syringe purchased from a pharmacy in advance to an electric vehicle repair shop at the south street of Wangcun Village, Sports Road.

In order to have a comparison, the reporter, with the help of maintenance technician Guo Zhipeng, found four old batteries that have been used for one and a half years, model 48V20A, two groups, group A added battery water, group B did not make any changes, respectively charged After the discharge, the length of the discharge is used to determine whether the post is reliable.

Before the experiment, the reporter used a universal meter to measure the voltage of four batteries, and both groups showed about 10.6 volts. Master Guo said that when the battery voltage is used at 10.5 volts, it is under voltage. At this time, the electric vehicle will automatically be powered off, and the voltage of the new battery will be displayed at about 13.5 volts.

First of all, the reporter and Master Guo used a screwdriver to remove the battery cover of the battery of Group A. After opening the cover, they found the six caps as mentioned in the post. The reporter then opened the six caps with an electrician's pliers and saw a small opening under each cap. Then, according to the method in the post, the reporter used a syringe to inject the battery water into the battery, and each small mouth was filled with about 20 ml to fill it.

The reporter covered the six lids, covered the battery cover, sealed the lid, wiped the battery dry, and performed the same operation on the other battery in Group A.

Master Guo will charge four batteries to simulate electric vehicles. After eight hours of continuous charging, the battery is fully charged. He then discharged it using a simple thermal energy consumption method. According to the post, after the battery is fully charged, the battery should be used up and then fully charged.

On February 7, the reporter and Master Guo will measure the four batteries that are fully charged again. It was found that the voltage of group A batteries with battery water added was 12.8 volts and 12.7 volts respectively; the voltage of the battery without any added in group B was higher, showing 13.3 volts and 13.1 volts.

Subsequently, for the same power consumption operation, the voltage drop rate of group A was significantly faster than that of group B. After about ten minutes of discharge operation, the battery voltage of group A dropped to 11.3 volts and 11 volts; in group B, it was 12.4 volts and 12.1 volts. After forty minutes, the voltage of group A showed 10.7 volts, 10.5 volts; at this time, group B was 11.2 volts, 10.9 volts. The conclusion of the experiment is obviously inconsistent with the battery after adding the battery water and charging.

Dispel doubt

Currently, most of the batteries on the market are maintenance-free. This method is not applicable.

"For maintenance-type batteries, this method can extend the lifespan. If it is good, it will be used for one month. If it is not good, it will be a week." Guo Zhipeng told reporters that the electric vehicle batteries on the market a few years ago were mostly maintenance-maintainable. This method can be used as a buffer, but after two or three times of liquid addition, the battery is completely scrapped. At present, the batteries of electric vehicles on the market are maintenance-free. This method is not applicable and may even shorten the battery life: "Because the battery water is a sulfuric acid dilution solution, if the battery is filled up with battery water, the battery water will be overcharged. When charging, boiling sulfuric acid will overflow, corroding the pile head of the wire, causing the pile head to rot and the battery to be damaged."

"The previous batteries were mostly maintenance-maintainable. We sometimes do this. It takes only ten yuan to maintain it once, but the diluted sulfuric acid has a corrosive effect on the human body. It is also very troublesome to get it." Yang Bo, another repairing electric vehicle on Sports Road, told Reporter, in addition to looking at the type of battery, we must also look at the damage level of the battery. "If you have been using it for two or three years, it is best to change it." "Battery batteries are sold by group, four batteries, model Different brands, the price is not the same. The cheapest is also more than 300 yuan. Two yuan a bottle of battery water, you can make the battery a new look, think about it is not reliable!" Yang boss engaged in repairing electric vehicles for nearly 10 years He told reporters that this method is urgent and can't solve practical problems. “If the battery is used for two years, the battery storage capacity will be reduced, even if the battery is not used.” As for the situation, the battery needs to be replaced. Yang Bo said: “The new battery like 48V20A can run more than 50 kilometers with full charge. If the electric car is charged for seven or eight hours, it can only run for twenty minutes, which requires a new battery!

It is necessary to add water. The lead plate of the water-filled battery is soaked in the electrolyte, and the lead plate of the maintenance-free battery is wrapped in something like cotton. These cotton-like things are filled with electrolyte. The battery has been used for a long time, and the electrolyte is definitely less. It should be replenished. When the electrolyte inside is low, the battery will heat up when it is charged. If it takes a long time, it will be scrapped.

I am repairing the battery. If you don't want to maintain the battery frequently, then you can buy a maintenance-free battery that does not add water. If you want to buy a battery with a heavy plate and a long life, you buy a battery with a liquid. I have compared these two types of batteries. The addition of liquid is obviously larger and thicker than the non-liquid plate. The only drawback is that it is necessary to check the electrolyte frequently, but if it is properly maintained, the service life is obviously longer than maintenance-free. .

The battery is divided into a liquid-rich battery and a maintenance-free battery. The liquid-rich battery can see the internal liquid through the visual appearance. The maintenance-free battery case is opaque, and the internal liquid is not visible, but it is also required to add liquid. Because lead-acid batteries, as the name suggests, only use lead plates and electrolytes to generate chemical energy, there is input and output of electrical energy.

The electric vehicle battery is a lean battery. The electrolyte is not visible inside. The electrolyte is adsorbed into the separator. It is difficult to completely replace the electrolyte. The main reason is that the electrolyte needs to be replaced because of poverty. The purity of the electrolyte used in the liquid battery is very high, which is higher than the purity of the externally purchased or self-contained. The electric vehicle electrolyte is generally a dilute sulfuric acid capacity with a specific gravity of 1.30 to 1.34. If you want to match it yourself, you can measure the specific gravity while diluting the sulfuric acid. After the addition, the full-scale specific gravity is generally around 1.37. Is it feasible to repair the battery according to the battery itself? However, because battery damage is divided into many types, hardware damage and software damage or end of life, most of the batteries on the market can be repaired, and some batteries can be repaired and repaired to achieve an ideal status.