Since no maintenance is required and valve regulated, Gel battery is classified as one type of VRLA battery. VRLA Gel battery is based on true gel technology which has more than half century experience. This type of batteries has gel electrolyte usually produced by the homogeneous distributed silicon dioxide in a diluted sulfuric acid named as gel SOL with thixotropic properties. The special designed vent valves are also used to control the gassing and water losing rate.
But why are they not widely used by people? There are four reasons in conclusion. First, the market share of almost zero; Second, most of the user response gel batteries in the summer heat and severe swelling caused by the battery "sudden death"; Third, gel batteries could cause an explosion, causing a fire; Fourth, the discharge poor performance, you may need to put power can not be large currents.
For those reasons, industry experts gave an analysis as following:
1. In theory, the volume of gel batteries with greater capacity, longer life, high and low temperature performance is better. However, domestic production of gel batteries, either prescription or gel plate perfusion, are not carried out by industry standards, resulting in low performance, short life and other issues.
2. Now made gel batteries for electric bicycle battery does not gel with foreign countries, as is made in the AGM separator, by vacuum infusion, the silicon filling cavities and sulfuric acid solution to the battery between the positive and negative plates.
3. Start-made gel battery fluid is rich with other VRLA batteries that are not the same. Early in the use of gel batteries; VRLA batteries can not be the oxygen cycle, it is because the positive and negative electrode gel were surrounded. Is the positive plate above the oxygen can not spread to generate negative plate, negative plate can not be achieved with the active material of lead reduction? Only by the exhaust valve in the discharge. Consistent with flooded batteries. Hence, early discharge is the acid to bring out the rubber, the particles easily adhere to the battery case, so, some users complained that the battery drain acid.
4. After a period of use gel batteries, gel began to dry and shrink, crack, crack oxygen through the oxygen directly to the negative plate cycle. Although the inhibition of the oxygen cycle water loss, excellent oxygen cycle also produces heat, so that the battery internal temperature, and even the formation of thermal runaway, resulting in cracks increased, the formation of abrupt termination of the internal fracture battery life.
5. Gel is much larger than the sulfuric acid resistance of conductive liquid, resulting in electric car battery voltage drop when high current start large motor starting torque decreased, the user can feel somewhat powerless.
6. According to ALABC (International Federation of lead-acid batteries) data show that the average life span of gel batteries are valve regulated sealed battery of 30%. This is the gel battery has good low temperature properties although it can not be the main reason for promoting the use of electric vehicles.
The conductivity of polymer colloids is weak, is generally not recommended for use as power batteries, in particular, often as a transport load of the electric car, we recommend the higher cost of electric vehicles first used lead-acid batteries, followed by a new generation of lithium-ion battery.
Gel battery, if as the ad says so well, why a large number of electric vehicle lead acid battery users chose it? Five years are proof that the lead acid battery is still the preferred means of transport of energy!
没有评论:
发表评论