How to choose electric car battery? Several methods teach you to judge the good and bad battery

　　Author ：Iflowpower – Portable Power Station Supplier

Many people don't know how to choose batteries when they replace electric car batteries. I will tell you about how to choose the electric car battery, and how many ways to teach everyone! I. Some people think that the key indicator of the battery is the battery life, but the cousin believes that all indicators must be established under "security", if there is no security in the battery application, then we For example, it is considerable to be threatened.

When you purchase a battery, look at whether the lithium-ion battery has a line protection board. The characteristics of the lithium-ion battery determine it must be an external protective plate, to prevent lithium-ion battery excessive, over, short circuit, etc. If there is no protective board, the biggest danger of such batteries is deformed, explosive, and leakage, safe performance is unqualified, can't be used! According to the current market (lead-acid battery, three-dimensional lithium-ion battery, lithium iron ion battery), the brother is recommended to choose a lithium iron ion battery, safer, not knocking.

Second, see the capacity of different capacitances, power, and life-fire miles directly lead to different differences in electric vehicles, and see how many volts and how many amps are available when they buy electric car batteries. At present, the battery is relatively generally 12Ah, 17ah, 20ah. It is also necessary to see the capacity of the battery.

If there is no indication, this is likely to be a inferior battery. This battery may be reassembled by the inferior battery or recovered battery core. Don't lower the price.

This battery life is short, and the performance is still unstable. If the usage method is inappropriate, it is very likely to damage the equipment, such as Said: explosion. The battery capacity is longer as used, and it will gradually attenuate, and the battery life will be shorter.

So, if you want to be a little longer, choose the battery capacity. There is a minimum capacity of different batteries. The capacity of unqualified defined is less than 70%.

The discharge results are less than the minimum standard. 81% correspondence battery capacity 25.6ah, the result is greater than 70%, within the qualified range.

Third, look at the danger of the appearance battery in terms of security, also related to the internal pressure, structure, process design of the battery. See the appearance of important watch work, size and craft. The same capacity battery, lithium ion battery is better than NiMH batteries, and the nickel-cadmium battery is light.

Watching the battery shell is not strict, there is no burr, oil stains, can also be indirectly available in this regard or if the battery can be easily leakage. Touch how to look at the battery, the process is good, it is definitely better than ordinary crafts, feel comfortable, after wear, rubber oil polished materials are good, and the insulation is also great, so prevent leakage. Fourth, the life of the cycle life is that the number of repeated charge discharges can be experienced by the battery, and the charge and discharge conditions have a big impact on it.

The larger the charging current (the faster charging speed), the shorter the life of the cycle; the deeper the discharge depth, the shorter the battery life is also. According to the newly developed electric bicycle battery standard, a certain capacity of 70% charge and discharge cycle will represent the life of the battery, and the pass line is 350 times. Factors affecting lead-acid battery life include internal factors and external factors.

Internal factor: composition, crystalline form, porosity, plate size, grid material and structure, etc.; external factors: discharge current density, electrolyte concentration and temperature, discharge depth, maintenance status, storage time, etc. 5.

The smaller the battery performance and the internal resistance of the test battery, the cell voltage error is small, the better the performance of the battery, the more the internal resistance is large, the more fever, the effect on the battery and the charger, and the battery itself consumes The more power is, the less power is actually used, the less utilization is low. The internal resistance of the lead-acid battery is small, and it is necessary to use a special instrument to measure the relatively accurate results. Ordinary consumers may not do it.

Here to analyze a common method: open the electric vehicle to no power, remove the battery, measure the voltage of each battery with a multimeter voltage to see if the voltage of each battery is consistent. The voltage of a single lithium ion battery is generally 3.6V or 3.

7V, so if the charger is displayed as other values, then there is a problem. If there is a voltage and several other different, pay attention: the difference is above 0.7V-1V, then this battery is bad.

Differences between batteries reflect the battery quality called uniformity calculation formula: [1- (maximum - minimum) / average] * 100%. The final result is greater than 95%. During the battery processing, the quality control is very good, more than 90%, the control is better, if it is more than 85%, less than 85% is not controlled.

There is also a method: discharge, discharge with electrical appliances with a relatively power, such as the use of a heating wire, the longer the battery capacity, the higher the battery capacity. Sixth, the power-moving capacity is sometimes strange, the electric car is clearly full of electricity, why is there no ride there for a while, the battery is not electricity? In fact, this is due to the self-amplification of the battery, the battery is reduced by about 2%, if the value is reduced by more than 2%, then the battery is not normal. At present, there are many lithium-ion battery brands on the market.

When you purchase, you should polish your eyes, choose after-sales service, brand batteries recognized by the country, and the quality of the battery, the battery price is not the only standard, Yunke Yuxi lithium phosphoric acid Lithium-ion battery, cheaper than other brands of the same type, but quality also lever. .