The electric car market by the actual situation of the investigation, poor experimental analysis of electric vehicle batteries on the market and the way ordinary charger charging the battery performance, and so in-depth analysis, and made an analysis report, This analysis reports on the current life cycle of the battery electric vehicles to reduce the cause of a reasonable explanation, but also on the current design of the charger Electric Vehicles dealers have a certain significance, and the charger to the electric car users to choose the direction.

Keywords:

Electric bicycle "heart "------ battery; lead-acid battery charge and discharge of the work process; charging; cycle life.

In recent years, with a further shortage of crude oil, rising oil prices. Electric vehicles as a green, environmentally friendly, convenient transport, more and more people like, its extraordinarily rapid development momentum, sales have been at an alarming rate geometric times to increase. Electric vehicles as a low energy consumption and pollution of new vehicles, with the majority of the market demand, domestic demand is a new industry. Which has a very huge market potential.

However, this year March 26, "Hubei Daily" article entitled <Jiangcheng 50,000 electric bikes as "orphan"> article like a bomb exploding in the consumer's head, to give consumers more power bicycle industry sounded the alarm. The article reported that there were many consumers to buy electric bikes in some quality problems, contact the manufacturer at service time, he was told the manufacturers have closed down. Why? 07 years ago, sales of electric vehicles is a multiple of the geometric growth, but the second half of 2007 power bike in a serious slow-moving, so many manufacturers to close down, resulting in a serious electric vehicles the root cause is the slow-moving : electric bicycle, "a serious heart "------ battery of premature aging, which makes the consumer had a question on electric vehicles, which choose to watch or not to buy!

Battery performance is to determine the important parts of electric bicycle is one of the bike the "heart", the majority of the domestic use of electric vehicles sealed lead-acid batteries, sealed lead-acid batteries because it is maintenance-free, safe and affordable non-leakage characteristics, which can fully meet the requirements of electric bicycles, especially in terms of price, is expected in the future for a long period of time, lead-acid battery is the electric bicycle will provide the main source of power, but with a sealed lead-acid batteries for charge mode is characterized by demanding, especially when used in the cycle, the charging conditions more stringent requirements, the same battery charging in different conditions will show a big difference, inappropriate charging of the battery performance cause very serious adverse effects, the image point is this: "Battery is not worn, but charge the bad."

Let's look at the work of lead-acid battery charge and discharge process: lead-acid battery charge and discharge process is the process of electrochemical reaction, when the cathode is the oxide charge, the cathode is a reduction; it is the positive and negative charge dilute sulfuric acid within the porous plate out, with resistance to extend the charging time decreases, the cathode on the oxidation of lead dioxide (PbO semiconductor), the negative lead sulfate is reduced to pure lead (pure lead is a conductor), which is oxidized to form lead sulfate lead. Cathode discharge is restored, the cathode is oxidized; discharge dilute acid stream ran into the positive and negative spaces within the porous plate into 30% -50% of the lead sulfate (lead sulfate is an insulator), the internal resistance of the extension with the discharge time increase, which is reduced to lead oxide and lead sulfate. The lead sulfate crystals is a very easy matter, when the battery in the electrolytic solution of sulfuric acid concentration is too high or static idle time is too long, the lead sulfate will "adopt a" group, to form small crystals, these small crystals of lead sulfate lead sulfate and attract around, getting bigger and bigger, like a snowball to form a large group of inert crystals after crystallization of lead sulfate in the low-voltage low current charge, not only can not be reduced to lead oxide regeneration, but will also speed up the lead sulfate holds together and precipitate attached to the electrode plate, resulting in a decreased area of ​​the electrode plate work (which is low power, low-speed lead-acid battery charger charging current root cause of aging), this phenomenon is that people are called sulfate , which also is often said that the aging. Most of the aging of the battery capacity will gradually decrease, and soon you can not use. When the lead sulfate will attract a large number of stacking when the formation of lead sticks of lead particles, through the positive and negative plates of lead between the bridge and causing short-circuit branches. If the surface or sealing plate molded case there are gaps, lead sulfate crystals will accumulate in these cracks, and produce swelling tension, eventually breaking off the plate or shell rupture, causing the battery irreparable physical damage.

Secondly, in the hot summer, the battery itself at high temperatures, ordinary third-order fourth-order constant-voltage charger in the late stages of analysis of gas is very serious (that is, a serious loss of water), it directly affects the cycle life of lead acid batteries This phase of the charging current is too small, plate combination reaction is not sufficient, trickle charge into the phase of the reference method is not very accurate current sample, causing the battery to accelerate in the latter part of severe dehydration, charging the latter part of the rapid rise in battery temperature and high in normal, self-discharge increased dramatically, so that after 180 charge cycles, even if the battery is fully charged can not convert charge output on and off lights, battery in between the single cell voltage and capacity inevitably the level of difference, the battery will be charged drum deformation, which is the battery charge is broken in after 260 charge cycles, even if the drum has not been charged but has caused deformation premature battery capacity decline, aging and damage.

Conclusion:

In summary, the battery electric vehicle power supply, it's good or bad use of good or bad is entirely determined by the charger, so we have to buy a good electric car charger in order to protect our "heart."