Author ：Iflowpower – Portable Power Station Supplier
Abstract: Introduced the development history of the valve sealing lead-acid battery and its current operating maintenance standards. Combined the basic structure and principle of the valve-controlled sealed lead-acid battery, discussed its failure mode and an important factor affecting life, and proposed its precautions in operation and maintenance. Keywords: valve control sealed lead-acid battery; standard; principle Features, so that it quickly replaces traditional antisocalyptic and explosive batteries in many applications.
The design life of the valve-controlled battery is generally greater than 5 years, up to 20 years, but due to its structural characteristics, the efficiency and life of the valve-controlled battery is more susceptible to environmental changes than the traditional antisocalyptic storage battery, etc. Effect of factors. Michaelr.
Through nearly 75,000 valve-controlled battery, Moore has shown that the actual service life of the valve-controlled battery is 4-8 years, far below its 10 ~ 20 years of design service life. It is therefore necessary to start from the principle of valve storage batteries, discuss various factors affecting battery capacity and life, so that the battery can be better maintained, extend its service life, reduce the safety risks brought by battery failure. l Valve-controlled battery development MF, SLA, VRLA are both the title of the valve-controlled battery.
MAINTENANCE-free is a referred to as a maintenance battery; SLA (SealEDlead-acidbattery) is a shorter referred to as a lead-acid battery; VRLA (ValveRegulated-acid-acidbattery) direct translation of valve-controlled lead-acid batteries, in some literature. Its direct translation name, national standard GBT19638.2-2005 fixed valve sealing lead-acid battery translated into a valve sealing lead-acid battery.
This is the name of the valve-controlled battery. From MF, SLA to VRLA, not only the change of the name, but also shows the development history of the valve-controlled battery. Early "maintenance-free battery" MF, means that the battery is used without adding water, phosphoric acid.
The application of battery-free maintenance technology can be traced back to the 1930s. In 1935, the United States is a special purpose, and the PB-CA alloy gate is applied to a low self-discharge rate (floating). In the mid-1970s, the US Gates launched a modern MF battery.
In the 1980s, due to advanced metallurgical and chemical technology introduced into the battery industry more perfect, the title of SLA-sealing lead-acid battery appeared. In addition to the battery internal gas composite technology, the SLA has also improved the battery structure. With the increasingness of the exhaust valve (safety valve), especially if there is more accurate open, closed valve pressure, the valve is an important part of gas composite and anti-leakage, sealing.
Therefore, it is called VRLA (ValveRegulatedLlead-AcidBattery) valve-controlled sealed lead-acid battery. 2 Operation and maintenance standard valve controlling battery operation maintenance standards Important IEEE standards, industry standards and company standards. IEEE (Electrical and Electronics Engineer Association) published the maintenance, test and replacement of the IEEE Standard 1188, 1996 IEE, recommended for fixed-use valve-controlled batteries, and re-announced the standard after 2005.
There are not many contents of revision and change, and it is important to adjust the battery-defined charge and discharge cycle, internal resistance (conductance) test. my country has announced the power industry standard, DL / T724-2000 power system battery DC power supply operation and maintenance technical procedures. The State Grid Corporation announced the company's internal "DC power system management specification" at the end of 2004, which contains the operation and maintenance of the valve-controlled battery.
3 principle, structure and its characteristics 1) The structure and principle of the valve control battery consist of a polar plate, a partition, an explosion-proof cap, a housing, and the like, using a full seal, a poverty structure and a cathodic adsorption principle, in the battery Internal re-sealing effect by re-adhering oxygen and hydrogen. The valve-controlled battery is divided into two categories according to the fixed sulfuric acid electrolytic solution, i.e.
, an absorbent battery of the electrolyte (AGM) and a colloidal battery using a silicone gel electrolyte (GEL) using a superfine glass fiber separator (AGM). These two types of valve-controlled batteries are made of cathode absorption so that the battery is sealed. The so-called cathode absorption is to make the negative electrode of the battery have excess capacity.
When the battery is charged, the positive electrode will precipitate oxygen. The negative electrode will precipitate hydrogen. When the positive epithelium is starting at 70% in the positive electrode charge, the negative electrode is abandoned when charging to 90%, and the precipitated oxygen reaches the negative electrode.
With the reaction: 2PB + O2 = 2PBO; 2PBO + 2H2SO4 = 2PBSO4 + 2H2O. Through these two reactions, the purpose of cathode absorption. Further, the reduction use of oxygen on the negative electrode and the increase in hydrogen excessive potential of the negative electrode it prevents a large amount of hydrogenation reaction.
The AGM sealing battery uses a pure sulfuric acid aqueous solution to the electrolyte, the diaphragm holds 10% of the pores without being occupied by the electrolyte, and the oxygen generated by the positive electrode is to reach the negative electrode by this part of the pore. The electrolytic solution of the silicon gel in the GEL colloidally sealed battery is made of silica sol and sulfuric acid. After the battery-perfusion silica is gel, the skeleton should be further contracted, so that the gel is cracking to penetrate through the positive and negative plate.
The oxygen to the positive extract is supplied to the channel to the negative electrode. Both valve-controlled batteries follow the same oxygen circulation mechanism, which is only different ways to reach the negative electrode to establish channels. 2) The characteristics of the valve-controlled battery are compared to anti-acid separation, the valve-controlled battery has the following characteristics: (1) fixed electrolyte, enhanced oxygen diffusion from the positive electrode.
(2) Safety valve of internal sealing structure and automatic switch. The battery operates under internal pressure to promote the reincarnation of oxygen. When the internal pressure of the battery is added to a certain extent, the safety valve automatically opens the exhaust; when the air pressure will be lower to the specified limit, the safety valve is automatically closed.
(3) Improved grid material. The positive electrode plate of the valve-controlled battery is made of high purity lead antimony alloy, and the negative electrode plate is supported by high purity lead calcium alloy, such a structure reduces the degree of electrical corrosion (4) a hard casing. Since the outer casing of the valve-controlled battery is to withstand a certain internal pressure, the outer casing is made of high-strength withstand voltage explosion-proof, so that the outer casing is more robust.
(5) No need to add water, ryose. The valve controlled battery of the valve control battery and the internal oxygen circulation mechanism make the electrolyte loss of the electrolyte, no need to add water during use. (6) Install the space to be small, which can be mounted on the battery frame or in the battery screen.
(7) Small environmental pollution. Email the fog and flammable gas during operation. (8) High requirements for the use environment, affected by the ambient temperature.
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