Automobile battery life detection

How to judge whether automobile batteries need to be replaced and the replacement cost of special batteries?

Fuel-powered vehicles are equipped with the same types of batteries as electric vehicles, all of which are lead-acid batteries: the positive electrode is lead dioxide, the negative electrode is lead and the electrolyte is sulfuric acid solution. This chemical power supply is characterized by short service life. For example, lead sulfate will be produced during the reaction of chemical agents, which will lead to the vulcanization of electrode plates over time and affect the charging and discharging efficiency; The electrolyte has the problem of normal volatilization, which can not be restored to the ideal state after later modulation and replenishment, so the maintenance-free type is scrapped directly. How long is the service life of this battery?

Theoretical value: After fully charging and discharging for about 350 times, the battery can reach the capacity, but can not reach the high voltage, so as to supply power for starting the motor and realize the normal operation of the engine. But fortunately, the car uses a "starting battery". After the engine starts running, there is no need for battery power supply, and the current is generated by the original car generator driven by the engine full time. Therefore, the service life of automobile batteries is often very long, and only users with bad car habits will need to replace them in 1~2 years.

Improper use habits refer to the long-term use of vehicle-mounted equipment after flameout, such as navigation machines, speakers, fans, etc. These devices will quickly consume the electric energy of the battery, and the engine charging will exceed the "fast charging method" that harms the battery after starting. If you use the car like this every day, the battery can only last for one or two years. As for how to determine whether the battery needs to be replaced, the method is actually very simple-"standby time test".

Test mode

1: The simple and direct method is to measure the voltage with a "multimeter" or use a tester connected to the 12 voltage device. After the battery is fully charged, the voltage will reach about 14V (the larger the capacity, the higher the voltage). If it is fully charged, it will be enough.

Generally, it is difficult to start the engine when the voltage is lower than 1 1V, while the fully charged battery drops from 14V to1/v.. With the battery of 12V-65Ah as reference, the time will basically be around 10 ~ 150000.

2. If there is no equipment, use the simplest "power off time" test. The standard capacity of the battery will be around 0.6 kWh, and the actual capacity will be half kWh. If it is used continuously for three to five years, the production capacity will drop again? ~? Moreover, too large discharge capacity will also affect the battery life.

The vehicle can be fully charged after normal driving for about 5 kilometers, and there is no problem if it stops for 3~5 days without power failure. For example, if it loses power for 2-3 days, it is necessary to consider replacing it. Is it necessary to talk for less than a day?

3. Observe the "observation hole" or "observation window" of the battery. Some battery holes will be under the sticker, and the observation window is like a short-circuited diode. The appearance characteristics of the two are different, but the law of color change is the same, because the color depends on the influence of the change of electrolyte density or the drop of liquid level caused by natural evaporation on the refractive energy of light.

The color of the observation hole is green, indicating that the battery is in good working condition, and when it turns black, it indicates that it is in a power-off state. Generally speaking, charging can restore the working state. And if the color becomes transparent and colorless, the battery will be scrapped.

Summary: The battery can be used normally for about 6 years, and it is also possible that some vehicles can actually be used for 8 years. Therefore, developing good car habits can really save money. Lock the car after parking. As for the cost of battery replacement, it is generally between 200/400 yuan, and most types are maintenance-free (batteries without electrolyte); Batteries with automatic start-stop function are more expensive, because the frequent starting of the engine consumes a lot of power. This battery can be selected from the excellent options of different brands between 600/ 1000 yuan for reference.