In today’s industrial-oriented society, the application of backup DC power supply is increasingly common, as a battery of the backup DC power supply tension, its performance state is especially particularly nervous. Among the family members of the battery, the application of the valve lead-acid battery in the DC reserve power supply is more common.
Although the valve-controlled lead-acid battery is widely utilized in power operating power supply, due to the special life of the valve-type lead-acid battery layout, it is necessary to use the battery in operation, and reliably Detect the performance of the battery and have a targeted manager to hold maintenance of the battery. Reasonably select and utilize the battery and battery monitoring modules in the current DC power system, there is a great role in the normal operation of the utilization life of the extended battery, which has a very nervousness of the maximum tranquil and economic benefits.
Failure mechanism of a lead-acid battery
The failure of lead-acid batteries has been tense for the peaceful operation of the power system. We hold this question to make readers have a brief understanding of this issue.
1.1 battery loss
Lead-acid battery loss can result in an increase in the specific gravity of the electrolyte, resulting in the corruption of the battery positive electrode grid, so that the active material of the battery is eliminated, thereby lowing the capacity of the battery.
The difficulty of lead-acid battery sealing is the electrolysis of water during charging. When charging reaches a positive voltage (as usual in 2.30 V / monomer or more), oxygen is discharged on the positive electrode of the battery, and hydrogen is discharged. On the one hand, the gas is released from the acid mist, and the moisture in the electrolyte electrolyte is eliminated in the electrolyte, and the water maintenance must be held in a period of time. The valve-controlled lead-acid battery is a product developed for these shortcomings, and its product features are:
(1) Acceptance of the multi-quality plate gate alloy to increase the over-potential of gas release. That is, the ordinary battery board gate alloy releases the gas during 2.30 V / monomer (25 ° C). After receiving the high quality plurality of alloy, the gas is released at 2.35V / monomer (25 ° C), thereby eliminating the amount of gas release.
(2) The negative electrode has excess capacity, which is 10% more than the positive pole. The oxygen released by the positive electrode released in the late stage, producing a response, re-generating water, i.e. O2 + 2PB → 2PBO, PBO + H2SO4 → H2O + PBSO4 causes the negative electrode due to oxygen, so that hydrogen is produced in gestation. The oxygen of this positive electrode is drawn by the negative lead, and then further chemically synthesized water, that is, the so-called cathode draws.
(3) In order to make the oxygen released by the positive electrode to the negative electrode as soon as possible, the microporous rubber separator in which the flattened rubber bine receives the microporous rubber partition is required. Its porosity is increased from 50% of the rubber separator to more than 90%, so that oxygen is easily smooth to the negative electrode, and the synthesis of water is recombined. Others, the ultrafine glass fiber plate has the results of adsorbing the electrolyte of the sulfuric acid, so the valve-controlled sealing lead-acid battery receives a poor solution plan, e.g., the battery is poured, and no electrolyte overflow.
(4) Accept the sealed valve-controlled labit acid layout, so that the fog can’t escape, reach the serene, cover the environment.
In the above-described cathode drawing process, since the water generated by gestation cannot overflow in a sealed environment, the valve-controlled lead-acid battery can be exempted from hydraulic maintenance, which is also the origin of the valve-controlled sealing lead-acid battery referred to as a free-free battery.
The valve-controlled sealing lead-acid battery has a compact acid cushion, which can effectively guard the ovife. However, the sealed battery is not essential, namely: the battery should be alive during the storage period; the charging voltage should not be alive with gas or less than the 2.35V / monomer (25 ° C); there is no gas in the discharge period . However, when the charging voltage is 2.35V / monomer, there is a probably emission. Because the battery body has generated a large amount of gas in a short time in a short time, it is not asked by a negative electrode. When the pressure is high, the unidirectional exhaust valve exhaust is started, although the gases excluded, although the fat filter is lost. Fog, but it will cause the battery to lose the gas, so that the valve-type sealed lead-acid battery is often strictly strictly strict, and cannot cause overcharge.
Article from: http://www.brcpower.com/
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