Example of principles of lead-acid battery and explosion cause

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

The lead-acid battery (VRLA) is an electrode important from lead and its oxide, and the electrolyte is a battery of a sulfuric acid solution. In the state of lead-acid battery, the important component of the positive electrode is the lead of the lead, the negative electrode is lead; in the state of discharge, the important components of the positive and negative electrode are the lead of sulfate. A nominal voltage of a single lead-acid battery is 2.

0V, which can be discharged to 1.5V, which can be charged to 2.4V; in the application, it is often used in series with 6 single lead-acid batteries to consist of a lead-acid battery.

24V, 36V, 48V, etc. The VRLA battery is designed: in the battery, part of the number of electrolytes are absorbed in the pole and the separator, and the negative oxygen absorbing ability is added, preventing the electrolyte loss, so that the battery can be sealed. VRLA Battery Structure Parts Component Material For Positive Extreme Polar Lead - Raw - Calcium Alloy Characters, the lead-containing lead-containing leads for the active material to maintain the capacity of the battery capacity, reduce the self-discharge negative negative lead --calcium Alloy fence, inherent sponge fiber active material guaranteed enough capacity for a long time to maintain battery capacity, reduce advanced multi-microporous AGM partition from discharged separator to maintain electrolytic solution to prevent positive electrode and negative short circuit.

Preventing the positive and negative short circuit to maintain the electrolytic solution to prevent the active material from falling off from the electrode surface to the electrochemical reaction of the battery, sulfuric acid as an electrolytic solution to transfer the electron energy to the battery positive and negative active material to transfer the outer casing and the cover without special instructions. Next, the housing and lids are placed in the ABS resin supply battery positive and negative electrode combined fences. Material is a synthetic rubber having high quality acid and anti-aging.

When the battery is higher than normal pressure, the releasing gas is released, and the pressure is maintained to prevent the oxygen into the terminal. The positive and negative terminal can be a connecting piece, a rod, a stud or an lead line. The sealing terminal facilitates the electrochemical reaction valve of the electrochemical reaction valve controlled lead-acid battery in large current discharge and long life electrode as follows.

Charging is to connect external DC power to the battery, so that the electrical energy is converted into chemistry energy. Discharge is that the electric energy is released from the battery to drive external equipment. When the VRLA battery charging will reach the vertex, the charging current is only used to decompose the water in the electrolyte.

At this time, the battery is in the positive oxygen, the negative electrode is hydrogen, and the gas will overflow from the battery, resulting in reduction of the electrolyte, need not to add water on time. On the other hand, under the end of charging or overcharge conditions, charging energy is used to decompose water, and the oxygen in the positive pole is in the negative sponge lead, so that a portion of the negative electrode is in the unfilcoming state, inhibiting the appearance of negative hydrogen. The new and old battery is connected in series, using a new battery due to a large chemical reaction material, the end voltage is high, the internal resistance is small, and the old battery is low, the internal resistance is large, and the internal resistance of the 12V supply is 0.

015-0.018 ohm, old battery The internal resistance is more than 0.085 ohm or more.

If the new old battery is used in series, then the charging voltage at both ends of the old battery will be higher than the charging voltage at both ends of the new battery, and the old battery has already passed the results of the new battery. High, and in the discharge state, since the capacity of the new battery is larger than the old battery capacity, the result is caused by excessive discharge of the old battery, and even causes the old battery opposite, and the battery bulge has caused side use. It will lose the electric energy of the new battery, and it will also cause the voltage inside the electrical appliance to install, and there is also the risk of excessive use of old batteries.

Three reasons for exploding: Overspeal high pressure in the battery causes the battery shell explosion from lead-acid battery working principle, and people understand the battery charging process, especially due to overcharge, water decomposition is hydrogen and oxygen, short circuit, severe vulcanization As well, when charging, the electrolyte temperature will rise sharply, and will evaporate the water, when the vent hole cover is blocked, because the gas is too late to overflow, the pressure inside the battery will rise high, first causing the battery cell deformation, This is a physical process when the internal pressure reaches a certain pressure. When the internal pressure of the battery is higher than 0.25 MPa, the battery is burst, and the burst position is located at the angle of the trough hot air bonding or stress concentration.

Hydrogen encounters the fire formation of the battery explosion hydrogen and the oxygen mixed gas of the oxygen mixed gas is hydrogen from 4% to 96%, the explosion limit of the mixed gas of hydrogen and air is 4% -74% of the mixed gas volume of the mixed gas volume. If the charge amount is used for electrolysis water, the hydrogen content inside the battery is greater than the explosion range, and when the amount of hydrogen in the battery is accumulated to the explosion limit, it will form an open fire to form an explosion, this is one Chemical reaction. Studies have found that the explosion of the battery belongs to the branched explosion reaction.

There are too many such explosions that occur in the case of overcharge, if there is a spots in the internal column, wearing welding, etc. A qualified battery does not have a self-heating explosion in normal use conditions. When the battery charging voltage gasoline car is higher than 14.

4V, the diesel car is higher than 28.8V, and the explosion may occur under the conditions of the simultaneous existence. Through the vehicle inspection of the battery explosion, it is found that most of the voltage regulators have defects, and the battery is in a serious overcharge.

Exhaust hole clogging forms explosion due to the blockage of the battery exhaust hole, the battery is burst, bursting causing the battery vibration, the pole line is not prisonless, thereby forming an explosion. .

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