Analysis of the Characteristics of Two Technical Ways of Valve-regulated Lead-acid Battery

Analysis of the Characteristics of the Two Technical Approaches to Valve-regulated Lead-Acid Batteries Gong Jianfu Shenyang Northeastern Battery Co., Ltd. Shenyang 026 This principle and the characteristics of the product have led to the premature termination of the life of the AG battery. analysis.

Before the mu China's valve-regulated sealed lead-acid batteries, hereinafter referred to as VRLAB mostly adopts liquid-absorbing AG separator production technology, hereinafter referred to as human-type, ie the electrolyte of the battery is absorbed and contained in the separator made of ultra-fine glass fiber. This technology has been introduced by many manufacturers since the early 1990s. With the deepening of its understanding and the research practices of Datong, the human form has made great strides in terms of manufacturing technology or technical characteristics, but according to domestic and foreign reports and Users reported that A-type VRLABs are prone to problems such as early loss of electrolyte dry-hot out-of-control and loss of capacity during use, including charge-discharge cycling and float-charging applications, leading to early termination of battery life. In the special seminars on the previous international telecom power conferences1 since 1992, the U.S. telecommunications sector responded strongly to these issues. In recent years, some people have clearly pointed out that besides material selection and its purity problems or due to human factors such as poor control in production processes and improper charging, these problems of human nature should be attributed to its almost self-contradictory design basis. How to overcome this contradiction, that is, to balance the basic reactions of A-style VRLAB with various secondary reactions and charging technologies, many studies and experiments are still needed. Shenyang Northeast Battery Co., Ltd. is based on the above considerations, weigh the characteristics of the two ways of production, in 1997 the first successful introduction of the German 0 colloidal electrolyte 01 eletrolyteVRLAB technology referred to as G type production model 0 0 fixed state of the battery 0 indicates that German industrial standards have been adopted, which has added new production technologies to China's manufacturing industry, and has provided DC power supplies with excellent performance and reliability for China Power Telecom and other systems. The following sections describe the basic principles of the two technical approaches and the unique features of G-VRLAB.

1 The most critical issue of the technical principle is to solve the problem that the battery's positive and negative electrodes precipitate oxygen and hydrogen during charging and other processes. In order to suppress the evolution of hydrogen gas, no matter human or type 0, the measures taken are that the negative grid adopts 8 series alloys to increase the hydrogen evolution overpotential so that the hydrogen evolution of the negative electrode is minimal, and for the establishment of the oxygen cycle in the battery, In two completely different ways, person 8 using a glass fiber separator absorbs most of the electrolyte required by the battery in a glass fiber separator with porosity, and the inside of the separator requires at least The partitions saturate the porosity of the acid absorption volume of about 10 to ensure that the oxygen evolved from the positive electrode diffuses to the lead negative electrode; and the establishment of the oxygen cycle is based on the porous porous network structure of the silicon gel in the battery with the 02 particles as the skeleton. The electrolyte contained in the battery is trapped inside, and the sol injected into the battery is gelled. In the initial period, the structure of the unstable skeletal structure is shrinking and the gel is cracked. These cracks penetrate the positive and negative electrodes. In addition, a channel is established for the oxygen cycle, and the following reaction H2O is completed to realize the oxygen resynthesis water synthesized by the positive electrode. Due to differences in manufacturing technology and battery structure, the characteristics thereof are different from human characteristics.

2Battery accommodation It is well known that the utilization rate of active material of 0 is lower than that of the rich type, and the discharge capacity at normal temperature depends to a large extent on the content of sulfuric acid electrolyte in the battery. Formula 1 is the guarantor 01 oxygen transmission channel, the battery must be in lean liquid state. Formula 18, when infused with sol, can occupy a space similar to that occupied by a liquid-rich battery due to its good fluidity. Therefore, formula 0 can accommodate more acid children, which is about 1.4 times that of type A VRLAB. The reaction is more complete and the battery capacity is accordingly raised.

3 Thermal runaway phenomenon VRLAB is operated under constant voltage floating charge state. The reaction between oxygen and negative lead and the neutralization reaction between product and acid are all exothermic processes, and recombination of oxygen will generate a large floating charge current. Both will cause the temperature of the battery to rise. If the battery's heat dissipation is poor and heat accumulation occurs, it will easily lead to thermal runaway of the battery. The liquid state of the oligohydric state is due to the small amount of the electrolyte and the relatively small heat capacity, and the tight assembly of the battery, and the presence of the gas space around the polar group, the heat conductivity of the child is poor, and therefore the heat accumulation inside the battery is easy to occur, and the zero type. 8 The battery has enough electrolyte space and the remaining space in the battery is large. The gel electrolyte is filled between the periphery of the polar group and the tank body. Therefore, there is a relatively large heat capacity and heat dissipation, and a low electrolyte density of 1.2463 is used. , Lower float voltage 2.23 and float current, so it is not easy to form heat accumulation and thermal runaway. The human battery adopts a comparative electrolyte density of 1.27130 to compensate for the acidity of the lean state. In addition, the float voltage of 2.25 and the floating charge current and its internal heat accumulation together constitute a serious risk of thermal runaway, which directly plagues the user. The main question asked.

4 Dry-up phenomenon The above formula has a relatively large amount of electrolyte. Sulfuric acid electrolyte density is low. The charge voltage is low. The float current is also small, so the water loss is also relatively small. Experiments have shown that when the amount of electrolyte in Type A VRLAB drops below 85 when the battery is saturated with acid absorption, the internal resistance of the battery will be greatly increased, which will cause the temperature of the battery to rise, which will promote the accelerated decomposition of water and eventually lead to the battery. The electrolyte dried up and the battery failed.

5 Lifetime As we all know, the positive electrode is a tubular battery with a long service life. At present, the human positive and negative electrodes are all painted and the 0-type positive electrode is a tube type. The positive plate skeleton is cast by means of die casting, and its alloy grains are Small, dense and dense, with the corrosion resistance that gravity casting does not have. In addition, the low density of sulfuric acid used in formula 0 makes the positive plate more corrosion resistant, and the low float voltage and low water consumption all contribute to the long service life of the battery.

In summary, due to various defects caused by the inherent characteristics of type 0, its application is also subject to certain restrictions. According to Article 10 of German Institute of Electrical Engineering 0 regulation 01088, such batteries should not be used as an emergency power source in important situations.

60 Other Characteristics of Formula 8 6.1 Anti-electrolyte stratification capability Since the valve-regulated sealed battery is not charged with a large amount of gas, there is no agitation of the electrolyte as in the case of a flooded battery, and the electrolyte density is easily increased. There is a phenomenon of layering up and down. If there is delamination, concentration batteries will be formed in the upper and lower areas of the battery. As a result, corrosion and water loss of the large positive plate of self-discharge will intensify, and the use of the battery will deteriorate. G-type VRLAB will avoid stratification to a certain extent, and its structure prevents the formation of subsidence phenomenon during the charging process of the sparse acid. Therefore, the zero-formula can be designed into a structure to reduce the floor defects.

6.2 Good charge retention The experiment shows that after the type 0 battery is sufficient, it is left open for 90 days, and the capacity loss is 10. In the 20 environment, the capacity is still greater than 50 for 2 years. In addition, the type 0 signal also has good depth. The discharge recovery capacity can be restored to 95 or more after being charged by the United States after continuing the discharge path. The â–¡ type separator is such a separator. China's Nanjing, Guangdong and 6.3 advanced tooling and process measures using imported high-pressure die casting machine to produce a positive skeleton, alloy grains small, bright surface, good corrosion resistance and mechanical strength.

The key components such as the partition sealer exhaust valve, etc. are all imported. The exhaust valve is manufactured in Germany and its sensitivity uniformity and reliability are high.

The colloid used for the battery was produced by an imported glue machine, and the partitions were also trial-produced by the Chemical Protection Institute. In addition, some units at home and abroad are also investigating rehydration measures12 and devices for reducing water loss3. The purpose is not to end the lives of people whose internal structure is still intact because of water loss alone.

Using the battery formation method, the battery is charged and the capacity is checked and discharged, and all are controlled by a computer.

The battery pole is a German patented structure pole. The copper core surface of the pole is plated with lead-tin alloy, which greatly improves the electrical conductivity of the pole. The unique pressure sleeve structure method and battery cell cover and pole sealed by the imported sealant and the imported microcomputer-controlled sealing equipment can effectively prevent the acid and liquid leakage of the pole.

7 Concluding remarks The stability of the body and the degree of thixotropy used in automotive-grade colloids also need to be studied. 44 In the history of the development of lead-acid batteries, it is a new thing. No matter whether it is human or type 0, it needs to be continuously improved. According to reports 5, the balance of the various reaction states in their respective design principles and the impact of critical charging systems on the product are still arduous tasks.

1 Wang Qiuhong, Zhang Jie. Valve-regulated lead-acid battery failure causes and capacity recovery.

The phenomenon that the electrolyte density and float voltage caused by positive electrode grid corrosion, dehydration, dry out, and thermal runaway is much more serious than that of the G-type VRLAB, resulting in a service life much lower than the design lifetime. This is almost a consensus.

Manufacturers at home and abroad have already developed and produced a liquid-enriched separator made of ultrafine glass fiber and organic fiber, which does not need to retain 510 pores of acid-free liquid as a gas through the 2 Sun Cheng, as in the case of the 01 separator. Valve - controlled Lead Battery Tank Wall Water Vapor Leakage and Solution . Save 3 Zhao Sui Tang. Fixed valve-regulated lead-acid battery life. Power Technology, 2000 4 Wushou Song. Deepening understanding of the storage of electricity in colloidal electrolytes. The 6th National I Lead-calcium Calcium Lubricated Direct Reading Spectrometric Reference Material for Alloying Directed by Shenyang Institute of Storage Battery and Shenyang Zhili Refinery Utility New Technology Development Co., Ltd., and invited the senior engineer of Shenyang Nonferrous Metal Processing Factory Jiao Fuxi National Standard Samples Technical Committee Nonferrous Metals Subcommittee Committee This project studied lead-calcium alloy direct reading spectrometric reference materials with reasonable design and advanced preparation technology. It not only can analyze tin secret silver, but also successfully adds elemental aluminum and dian. And each analysis element has a good uniformity, the set value is accurate and reliable, the spectral curve points are stable, and the linearity is good, reaching the advanced level of similar standard materials at home and abroad. At present, this set of reference materials is used in Shenyang Battery Research Institute and Baoding Jinfengfan Battery Co., Ltd. The reaction results are good. In this project, a total of 2 sets of lead-antimony alloy standard samples have been developed. In addition to the use of designated units, they can also meet the valve-regulated lead-acid battery manufacturers and lead-calcium alloy manufacturers that have analyzed the lead series alloys by Jibei Photoelectric Direct Reading Spectrometer. The need for a limited number of factors, if necessary, please contact the Shenyang Institute of Battery Research Laboratory as soon as possible.

j Address No. 33, Beizhong Road, Tiexi District, Shenyang, 026 Zhuang Yajing

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