As oil prices have risen steadily in recent years, electric cars as a green, environmentally friendly, convenient transport, its extraordinarily rapid development momentum, production and sales have been increasing at an alarming rate doubled, but many consumers in the use of Electric Vehicles lead after six months acid batteries on a continuous problem, because lead-acid battery manufacturers have committed to one year battery warranty, so users have to find vendors replace lead-acid batteries, lead-acid battery manufacturers and dealers and repair to bring an invisible user pressure, dealers spend a lot of energy testing, maintenance, service, or can not avoid complaints. Battery manufacturers can promise quality products lead-acid batteries a year, why are there six months after a lot of the problem? Why it's back return rate dramatically increase? My analysis into the following four main areas of important factors:

A congenital lack of the important factors

We use the electric car batteries often by 2 (24V), 3 只 (36V), 4 只 (48V) battery made of lead-acid batteries in series, and even some beyond the standard battery bike also use 5 (60V) lead-acid battery cells connected in series, and each house in turn, six 2V battery of a battery composed of monomers, (that is, in plain view inside each cell of six 2V small batteries in series of a 12V battery), but to such a good series into lead-acid batteries, it is necessary for each small single lead-acid batteries rigorous screening, so only a single 12V battery composed of the same features, only the battery in order to achieve the most best combination of effectiveness, in order to improve the cycle life of batteries only, otherwise the quality of the battery is a problem only if: a battery composed of only a single small battery capacity, voltage is low, then this single charge body batteries fully charged and entered the first charge state, again and again resulting in whole battery charge, and had charge of the water loss which will only lead-acid battery affect its life cycle; in the discharge of this single cell on the most First is discharged into the discharge state, we all know, lead-acid battery will discharge it directly affects only the composition of other cell cycle battery life; (equivalent to people in their daily lives using the old and new batteries together state, was tantamount to a battery pack in series between the resistor using the same) so that only the battery capacity will soon be reduced to accelerate the aging of the battery only, so that only the battery into a vicious circle of state.

Conclusion: Some battery manufacturers in the manufacture of the battery when its concentration polarization and resistance polarization voltage is not completely done, coupled with the appropriate testing equipment and instruments is not perfect, the use of lead-acid battery itself is not the same characteristics, which resulting in the manufacture of batteries only when there is congenital deficiencies, coupled with some electric-vehicle system configuration poor production of electric cars on the finished product to the market, it's the battery life of course, short cycle. This is why the production of electric car manufacturers electric car 36V 48V electric cars more reliable than the why. It is suggested that manufacturers try to produce 36V electric cars.

2. Important factor in the charger

Battery charge and discharge cycle of work, size and charge current and voltage charge control, etc., are all directly affect the service life of lead-acid battery recycling an important factor, and lead-acid battery capacity and voltage needed to determine the charge parameters, so the charger and battery parameters parameters to closely cooperate in order to reduce the improper charging of the battery capacity of the damage.

Now many manufacturers feel that the charger simple structure easy to manufacture, production inputs is not large, the market demand is great, so have launched production of the charger, the charger is now an ordinary selling price from twenty or thirty dollars to seventy to eighty dollars Their charge control model varies, the charging current is small for a long time, then the battery is easy to heat a large current, leading to cell water loss, reducing the battery life, this small current in the winter charger charging another problem has emerged : the case of low temperature in winter goes high viscosity of sulfuric acid within the battery, the battery internal resistance to increase exponentially, which makes the slow electrochemical reaction, the charge current is small under the conditions, the battery can not be fully charged, it produced a charge less, and often due to charge the battery will produce sulfate, accelerate the aging batteries.

It is now generally a little better use of constant current, constant voltage, three-trickle charge mode, constant voltage charging at the late stage of the gassing very serious, which seriously affects the cycle life of lead acid batteries, this phase of the current is too small, inadequate plate combination reaction, into trickle charge mode, compared with current sampling stage charging, the battery is very serious loss of water in the late, late charge will be higher than normal temperature of 40, increased self-discharge, the battery is fully can not turn off conversion charge indicator and charge output, the battery pack in between the single cell voltage and capacity inevitably differences between high and low, the battery will be charged drum deformation, which is to charge a bad battery, so there the "battery is not charged with the bad but bad" argument.

Conclusion: At present most of the charger into the following issues need to be overcome.

①. Charging of lead-acid batteries, the charging current is small for a long time, then the battery is easy to heat a large current, leading to cell dehydration, shorten battery life. (Comment: Sin Ma charger 4A high current charge, but also in the process of charging regardless of battery performance is good or bad, will not cause the battery to heat!)

②. Lead-acid battery charging, due to the winter low temperature sulfuric acid high viscosity within the battery, the battery internal resistance increases exponentially, making the electrochemical reaction diffuse, in a small charging current conditions, the battery can not be fully charged, it will naturally produce sulfate of shortened battery life. (Comment: Sin Ma charger built-in charging mode and more than 3,000 sets of temperature sensors and compensation systems, so completely filled the summer, but winter does not charge less!)

③. Battery in the discharge of the batteries will have the inevitable differences between high and low voltage, the voltage level difference, the more will cause the single cell voltage and low capacity fading speed, so a vicious cycle battery life to shorten the overall increase. At present, most chargers when not only no way to charge balance the voltage difference of this patch, it will increase. (Comment: Sin Ma charger unique equilibrium charge is very good solution to this problem, manifested in the process of charging the internal battery is continuously test the grid voltage conditions, timely discharge of the battery charge acceptance and low battery fully charged cell , the entire balance of the battery group!)

④. Charging of lead-acid batteries, the battery charge is too long or less in a state of charge, continue to water loss and the internal battery sulfation, greatly reducing the service life. (Comment: Sin Ma charger built more than 3,000 different sets of charging mode, the computer program for the internal voltage of the battery of testing more than 3,000 times per second, while the return according to the internal battery voltage charging mode of adaptive selection!)

Hope the above problems charger manufacturers thinking of solutions for the health of our electric car industry has made sustainable development a contribution they can do. (Fairy horse people do make a great contribution, but fairy horse people are very helpless, because its costs are a good product on the market relative to inferior products as much higher, and consumers do not make rational consumption of horse cents develop very slowly, the industry's healthy development needs of the industry all together!)

3. Important factor in the controller

Discharge the battery electric vehicle is one of the main duty cycle, that is, the process of driving electric vehicles, and in the process of moving the controller controls the battery discharge parameters, and thus it is also an important impact on battery life cycle factors. And people tend to ignore this factor will affect the electric vehicle battery cycle life battery and charger attributed responsibility for all manufacturers, so that the battery and charger manufacturers have suffered a lot of unredressed injustice.

For example: ①, high-current discharge. General 36V/10AH maximum discharge current of lead-acid batteries 1C, the 10A discharge, and the current electric car manufacturers in order to meet consumer demand, improve acceleration power, increase speed and improve the climbing ability and load level, tend to 36V / 10AH lead-acid battery electric vehicle controller is greater than the limiting current relaxed to 14A (even greater than 20A), so that all aspects of the performance indicators are improving, but shorten the battery's cycle life, of course, use these questions in the user is undetectable early in the use of more than six months before the fresh feeling of a small electric car, charging the charger indicator light, and so does not convert fully charged.

② discharge. Directly affect the battery over-discharge cycle life is an important factor, the controller generally are equipped with under-voltage protection circuit, but to prevent the use of battery recovery voltage (that is, to stop discharging the battery after each battery voltage will rise at around 2V .)

4. Important factor in motor

Electric bicycle motor is battery power will be converted to kinetic energy of the device, the motor in this part of the energy conversion process is the conversion efficiency to be consumed by the motor, the motor current in the different segments are different in operation efficiency, general Depending on the various electric depot electric car will set a maximum operating current, when the external load is larger, the electric bike reaches its maximum operating current, maximum input power also, for example: an electric car is set to the maximum operating current of 12A, working voltage of 36V, then the maximum input power is: 12 × 36 = 432W. If the motor is 432W input power efficiency up to 85% of cases, that the output is: 432 × 0.85 = 367.2W. Motor car used for a period of time the power and efficiency will be gradually reduced over time, there may be 75%, 65%, 55%, due to the quality level of the motor, depending on when the motor's maximum output power is only 432 × 0.75 = 324W, 432 × 0.65 = 280.8W, 432 × 0.55 = 237.6W, the vehicle's performance will be significantly decreased, motor drive system can cause deterioration of the battery current increases, the load capacity or efficiency characteristics worse case, if the event of more than 2 times the vicious use of permanent magnet motor demagnetization phenomenon will be serious, comprehensive efficiency characteristics will deteriorate, leading to a sharp increase in battery current, discharge time, leaving the sharp reduction in driving distance less than the customer battery capacity has been mistaken for a recession. Some users replace a new battery after the vehicle to continue the mileage or the lack of which indicates the battery is not necessarily a problem.