How to measure the capacity of electric vehicle battery

In people's daily life, electric vehicles are often used. Electric vehicles can be said to be the most important means of transportation in modern times. For electric vehicles, the most important core component is electric vehicle batteries, which are often seen. To the description of the battery capacity on the battery of the electric car, how to measure the battery capacity of the electric car? Let me introduce the following:

Rated capacity refers to the design and manufacture of battery, or guarantee the battery under the certain condition of discharge should be let out of the minimum power, is often referred to as the nominal capacity. It is important to note that a battery capacity is determined by the capacity of one of the electrode, rather than the sum of positive and negative capacity. Therefore, the actual capacity of the battery depends on the electrode capacity is small, generally set negative excess capacity in actual production, so the positive capacity limit the capacity of the battery. This is you need to understand before know how to measure electric vehicle battery capacity.

Method for determination of the battery capacity and the battery discharge performance testing methods are basically identical, persistence discharge current, constant resistance discharge method, constant voltage discharge method, the voltage constant current discharge method, continuous discharge method and intermittent discharge method, etc. According to the size of the discharging time and current can calculate capacity of the battery. Constant current discharge methods are mainly introduced below:

Method of constant current discharge capacity and discharge current has a lot to do, and discharge temperature and charging system, put aside time will have an impact on capacity. Under the same discharge system, different charging system for battery charging efficiency is not consistent, so the battery discharge capacity is also different. Also, under the same charge system, hold for 10 min and 1 h and then to discharge capacity test, the result also can have the difference of 2% ~ 5%, depending on the self-discharge performance of the battery.

In the process of constant resistance test capacity of discharge, the discharge current is not a constant value. Discharge starting current is bigger, then gradually smaller. And the discharge resistance, the greater the discharge current is smaller, the smaller the resulting voltage drop, voltage drop slowly, discharge curve is relatively flat, discharge capacity.

Through the introduction of the above, I believe we have a better understanding of how to measure the battery capacity of electric cars!

Electric vehicle battery capacity of national standard is two hours when the discharge rate, that is to say, no matter how much you the two hours after the telephone batteries, such as 5 a discharge current of two hours per hour capacity of the battery is 10 ah, 10 a current discharge two hours per hour capacity of the battery is 20 ah. Now some of the underlying battery it mark that is to say, so it is not A national standard discharge, discharge it is 5 hours per hour of 2.4 A electricity into exile after the electricity.2.4 A current of electric vehicles was useless. So when buying a battery must pay attention to the sign (5 hr).If there is no sign that it is the national standard.

The battery capacity are written on a battery, just take a look. 6-dzm-14 means the battery is 14AH, 6-dzm-12 means 12AH, and 6-dzm-10 means 10AH.

Next I’ll introduce the scientific use of electric vehicle small coup

First, how to use the batteries can prolong the service life of the battery?

Experienced users know the cost of the battery is one of the largest consumption, electric bicycles so users very much concerned about the problem of extend the service life of the battery. You must first assume that the charger is no problem, whether the user used correctly is very important to the life of the battery. Considerations for used batteries are as follows:

Protect the charger. Generally the use of the manual has to protect the charger. Many users do not have the habit of watching the instruction, often in addition to the problem later remembered that seek instruction, often it is too late, so look at the instruction is very necessary. In order to reduce costs, the charger now basically didn't do the design of high resistance to vibration, in this way, the charger generally do not put in the trunk of electric bicycle and basked in. Special circumstances, we must move, also want to charge for raincoat soft material, such as to prevent vibration of turbulence. Many chargers after vibration, its internal potentiometer will drift, make whole parameter drift, result in abnormal charging state. Also need to pay attention to keep the charger is charging time is ventilated, otherwise not only affect the service life of the charger, the thermal drift in May and also affect the charging status. This will be on battery formation damage. So, protect the charger is also very important

Charge in time every day, even if your line continuation ability request is not long, charge can be used 2 to 3 days, but still it is recommended that you charge every day, so make a battery in the shallow circulation state, the battery life will be extended. Some early use of mobile phone users think finished her best is the basic use rechargeable batteries, this view is wrong, the memory of lead-acid battery benefit is not so strong. Frequent discharge has a significant impact on battery life. Most of the charger in the indicating lamp light changes after a full charge, the battery into battery may be 97% ~ 99%.Although only owe charging 1% ~ 3% of the battery, the impact on the ability of line continuation almost can be ignored, but also can form owe charge accumulation, after a full battery so light changes or continue float charging as much as possible, to control the battery sulfide is also good.

Charge it in a timely manner. Battery discharge began after vulcanization process in 12 hours, there is an obvious sulfide. Charge in time, can remove sulfide not badly, if not timely charge, the sulfide crystallization will accumulate and gradually form the crystallization of bulky, generally the charger is helpless for the crystallization of the bulky, will gradually form the battery capacity decline, shorten the service life of the battery. So, in addition to charge every day, also note that after using to charge as soon as possible, as far as possible make the battery in the full state.

Make full use of the maintenance condition of electric bicycle dealers can provide battery repair and maintenance service, should make full use of these services. Some brands of electric bicycle for maintenance of the battery are put forward. Such as: to preventive maintenance of the battery, can reduce the damage to the battery. The battery charged state of repair can alleviate the failure of "battery" behind, and these for dealers equipped with maintenance ability is easy. For water, at the time of battery capacity 70% hydrating than 40% when the battery capacity hydrating effect is better. Even some brand products are also put forward: the stipulated time to repair is equivalent to give up the battery warranty period, which should not happen of damage to consumers. Consumers, therefore, should make full use of extended battery maintenance conditions to increase the service life of batteries.

Through these methods, the user can greatly prolong the service life of the battery. Some users of line continuation mileage is shorter, the service life of the battery is relatively long, some problems is relatively difficult to find. So, article 4 when it comes to the "deep discharge" measures and an effective way to discover the battery problem, don't wait for the battery is difficult to deal with the serious problem.

Correct maintenance can make the battery life longer, and save more. Note, first of all, the battery installation is firm, in case the battery when riding by the vibration damage. Otherwise, the car run on the bumpy road, lead to wobble or even fall off and damage battery. Second, often should check whether the battery cables, union is strong, whether good contact between line and joint. Otherwise, it is possible to cause an electric spark and, in severe cases, a battery explosion.

Second, the electric vehicle maintenance and matters needing attention

1, frequent charging -- lead acid batteries should be maintained with the habit of charging, cannot wait until the battery is used up, this will affect the battery life. If not used for a long time, charge it once a month. Please use the matching charger for charging.

2, more maintenance - in case of rain water, cannot let the water flooded hub center; Get off the switch in time, usually will tire enough air; In the case of heavy load such as uphill, headwind, pedal power; In case of failure, timely send to the manufacturer's designated special maintenance department for maintenance.

3, regular lubrication --- according to the use of the situation, should be front axle, rear axle, central axle, flywheel, fork, shock absorber rotating fulcrum and other parts every six months to one year to scrub and lubrication (recommended use of molybdenum disulfide grease). The transmission parts in the electric wheel hub have been coated with special lubricating oil, so users do not need to scrub and lubricate themselves.

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