Detailed UPS VRLA Battery Leakage Fault Analysis and Treatment

2022/04/08

  Author :Iflowpower – Portable Power Station Supplier

VRLA Battery Leakage Fault VRLA Battery (VRLA Battery) A leakage failure, in addition to the mechanical damage caused by transportation, handling, is important due to manufacturing defects, such as excessive electrolyte injection, sealing, sealing material Unqualified and sealing material aging, etc. Some manufacturers are applied to silicone oil around the VRLA battery, which is used to enhance the sealing performance of the VRLA battery housing. There may be a non-acid liquid to ooze from around the medium pole column, which is normal, not a leak Liquid, pay attention to distinguish.

Therefore, it is found that the drain VRLA battery should be replaced immediately, or replace it before the VRLA battery is close to the life. Will also occur when the VRLA battery seal and the safety valve are not problematic. Many VRLA batteries are in an exproprium, VRLA batteries have no oxygen circulation.

Three chargers in the open state of the VRLA battery are discharged. The proportion of sulfuric acid is again improved. When the safety valve is covered, the electrolyte does not absorb, and there is a free acid.

Even if the free acid absorbers, VRLA batteries are still in the previse. The electrolyte in the separator is more than. The electrolyte slightly more electrolyte in the separator affects the oxygen circulation, so that when charging the new VRLA battery, the amount of exhaust is relatively large, the sulfuric acid brought out, forming a drain.

The colloidal VRLA battery is in the top 50 to 100 cycles, the VRLA battery is in the transition period of the rich liquid to the lean solution, the exhaust is more severe, and the exhaust gas generate colloid fine particles form a drain acid. VRLA battery leakage is important to behave in a leakage caused by pole leakage and shell cover sealing. Two sealing methods of VRLA battery shell cover have two categories: glue seal and heat sealing.

The gelatin method is that the shell cover is used as the epoxy resin seal, the sealing quality is affected by epoxy resin glue, such as the possibility of leakage of epoxy resin in aging and cracking problems. The heat seal is after heating the ABS housing to a certain temperature (with certain fluidity and adhesion), filled it into the slit between the shell and the cover. Cooling the back shell cover is integrated, shell, cover binding portion is ABS one material.

Therefore, the heat seal has a high sealing reliability. The heat sealing can solve the problem of leakage between the shell cover. Sealing quality between poles and shell caps is one of the important factors affecting the life of VRLA battery.

The polar column sealing structure has 4 categories: 1 resin sealing structure; 2 resin secondary sealing structure; 3 mechanical compression sealing structure; 4HAGEN patent column sealing structure. VRLA Battery Leakage Phenomenon Analysis of the relationship between 1RLA battery leakage and electrolyte VRLA battery design is a basic principle to adopt a lean solution, so that the positive electrode appears to obtain a maximum composite absorption on the negative electrode through the internal circulation. The rethink of the internal gas of the VRLA battery, maintains the balance of water in the electrolyte, so that the VRLA battery is sealed.

If the amount of electrolytic liquid is too large, the internal gas re-cooperator is blocked, the internal gas increases, the pressure is added, and it is easy to leak in the defective portion of the VRLA battery seal. Therefore, the amount of acid to add the battery of the VRLA battery must be appropriate. In terms of VRLA battery, the electrolyte density is generally controlled by 1.

10, and the electrolyte density of the discharge is 1.30, and the VRLA battery can be calculated to calculate the VRLA battery per AH minimum amount of acid. The pure H2SO4 required before discharge is: w (H2SO4) = V×of×M pure H2O amount is: w (h2o) = v×D (1-M) The pure H2SO4 required after discharge is: w (H2SO4) = V×of×Each of the 1AH power is released in N-3.

36, and the purified H2SO4 is 3.66g, and the water is 0.67g.

In the formula, D is the electrolyte density at the start of the discharge, which is 1.30; m is a percentage concentration of the discharge start weight, which is 38%; the weight percentage concentration after the discharge, which is 16%; V is a concentration D. Sulfuric acid volume.

Therefore, VRLA battery should be applied to the electrolytic solution per AH to ensure that the desired electrolyte must be completely adsorbed in the partition, and some gas passages are generally 17 g of the glass fiber separator per AH. , Saturated saturation acid per G partition is 0.8ml.

Therefore, the maximum suction acid is 13.6 mL, ensuring that the sealing partition is the maximum amount of acid to more than 95%, typically 92%, that is, the maximum amount of acid is 12.5mL, and the amount of acid should be controlled between 10.

9 to 12.5ml. The 2VRLA battery leakage site is observed for a long time, and it is found that the VRLA battery leakage site is important to the seal between the VRLA battery shell cover (the cover and the bottom tank are sealed or caused by collision, sealing glue cracking causes leakage), safety valve Decapulsate and other parts of otteric leakage and other parts of the permeable leakage liquid, the polar terminal sealing.

The causes of the leaks in all parts are different, and the corresponding measures should be taken after comprehensive analysis. 3VRLA battery shell cover leakage VRLA battery shell cover seal is generally used as 2 methods of epoxy resin adhesive seal and hot fused seal, relatively, the hot fuse sealing effect is better, the method is to make VRLA battery slot cover plastic by heating (ABS) Or PP) hot melt pressurized fusion together. If the hot melt temperature and time are controlled, clean and non-dirt, the seal is reliable.

The VRLA battery of the hot-fused sealing liquid is observed, and the gas is hot, and there is a honeycomb shade. It is not very dense. Since there is O2 in the inner portion of the VRLA battery, O2 is leaking along the sand passage along the sand passage.

liquid. Epoxy resin adhesive sealed VRLA battery leakage liquid, especially for lying. If the epoxy formula and the curing condition are controlled, it can be sealed.

The VRLA battercharge of the epoxy resin adhesive sealing liquid is found that the sealant and the housing bonding are the interface bonding, the binding force is not large, easy to fall off, and there is a lacemic hole or crack at the leakage. Since the epoxy resin is poor (especially low temperature curing), it is easy to cause a sealing shell cover, and there is an important VRLA battery that occurs in the cascade. In the middle, due to gravity use, the cascade deformation causes VRLA battery sealing layer, and the epoxy resin is firm and crisp, under external force, it is easy to cause cracking.

4 Safety Valve Leakage Cause Analysis Safety Valve Sealed Use under a certain pressure, the safety valve automatically opens the gas, guarantees the safety of the VRLA battery safety, resulting in a safe valve, and the significant reasons for the safety valve leakage.•Excessive acid is too large, the VRLA battery is in a state of rich liquid, resulting in the gas passage of the O2 reincarnation, the O2 increases, the internal pressure increases, the safety valve is opened, O2 is released, and the acid is released. The fog is formed into an acid solution around the safety valve;•After the safety valve is poor, after a period of use, the rubber of the safety valve is protected by O2 and H2SO4, the safety valve is elastic, and the opening pressure is lowered, and even the long-term in turn, causing acid fog, leakage.

5 Pole Terminal Leakage Cause Analysis The general method of the VRLA battery pole terminal seal is to first weld the lead bushing on the shade of the hilabes, and then the epoxy resin sealing seal is reused. In the installation of more than 1 year of VRLA batteries, there is a discharge of the pillar terminal, and the terminal leakage is used in 3 to 5 years, and the positive electrode is serious than the negative electrode, which is currently in China to produce VRLA batteries. .

By anatomical discovery, the pole terminal has been corroded, and the H2SO4 flows along the corrosion passage, there is a leakage liquid to the terminal surface, and it is called clipping or leakage, and the main corrosion is caused by corrosion of O2 under acidic conditions: Positive pole: PB + O2 + 4H +→PBO + H2O negative electrode: PB + O2 + PBSO4→PBSO4 + H2O  The eroded PBO and PBSO4 are porous, and H2SO4 climbed to the outside along the corrosive holes in the internal pressure. Relatively, the corrosion speed is slow, so there is a long period of time, and the positive electrode corrosion speed is greater than the negative electrode, so the positive limit is severe. Since the VRLA battery pole welding is generally acetylene, oxygen welding, the welding time is formed to form a layer of PBO, and the PBO is easy to react with H2SO4 more accelerated, shortened the flow time.

The VRLA battery of the cassette is more likely to have a leakage, which causes the casing beam deformed due to gravity applications, and the hard connection makes the terminal force, and the sealing rubber is easy to detach. VRLA Battery Leakage Solutions About VRLA Battery Leakage Faults should be checked first, find out of the otteric leakage. Take the cover sheet to see the safety valve is trace of oxygen-free leakage, and then open the safety valve to observe the inner portion of the VRLA battery has a flowless electrolyte.

After completing the above work, if there is still no abnormalities, airtight test should be made (prayed in water and pressurized, observe that there is no bubbles in the battery and appear, there is a bubble, explain how to permeable acid leakage. Finally, during the charging process, there is observing that there is no flowable electrolyte, if there is any reason for production. During the charging process, if there is a flowing electrolyte, it should be exhausted.

VRLA Battery Shell Leakage Solution 1, the VRLA battery about the hot fused seal should strictly control the hot melt temperature and time, and keep the hot melt surface clean and tidy; 2, combine hot melt and adhesive sealing, first use hot melt seal , Re-seal; 3. About the epoxy resin seal, a high temperature curing chamber should be established, and the epoxy resin is better solidified; The shell cover uses acrylic sealant, so that the shell cover is integrated, and the seal is more reliable. 2 Safety Valve Leakage Solution 1, using anti-aging rubber (such as fluorine rubber) to make safety valves, extend the aging time; 2, regularly replace the safety valve to ensure the reliability of the safety valve, generally more suitable for 3 years; 3, change the safety valve structure to turn on the pressure adjustable.

At present, the column safety valve is a relatively complete structure. There are many rubber used in the column safety valve, the aging resistance is good, and the pressure is adjustable, and the aging (opening pressure is lowered) can be appropriately adjusted, and the newly opened pressure is guaranteed. sex.

3, polar terminal leakage solution solution 8, using inert gas protective welding (such as argon arc welding), so that the welding surface is not oxidized, delay the corrosion speed; 9, increase the high pole terminal, extend the height of the sealant layer, extend Corrosion leakage time; 10, use rubber pressing seal, block O2 channel, delay corrosion speed. If the pole-column terminal sealing is highly designed, it can realize unevenness in the life of VRLA batteries.

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