-How to judge whether the car battery needs to be replaced

How to judge whether the car battery needs to be replaced
author:enerbyte source:本站 click451 Release date: 2022-11-15 08:40:15
abstract:
This question belongs to the owners of vehicles with automatic start stop function. The battery is an indispensable part of the vehicle, which can be divided into traditional lead-acid batteries and maintenance free batteries. The biggest role it plays is to provide a strong starting current for the...

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This question belongs to the owners of vehicles with automatic start stop function. The battery is an indispensable part of the vehicle, which can be divided into traditional lead-acid batteries and maintenance free batteries. The biggest role it plays is to provide a strong starting current for the starter when starting the engine!

For example, some people say that measuring the internal resistance is not very convenient, because the internal resistance of the battery is greatly affected by temperature and other factors. In addition, professional battery internal resistance measuring instruments have high accuracy and very attractive prices. It's easy to start thousands of times. And those hundred and ten dollars bought online can be used as toys. Professional battery internal resistance analysis is mainly used to ensure the consistency of individual cells when assembling lithium battery packs, so as to prevent some cells from being damaged due to low consistency.

In fact, the car battery is not so fragile. Even if the battery is exhausted accidentally several times, it does not need to be replaced immediately, as long as it can be used normally after charging, but you must pay attention to good car habits, do not use the car battery for a long time when the engine is off, and try not to install some high-power lamps or stereos. Just let the battery do what it did when it left the factory (of course, it's OK to bring a tachograph or something like that). It's usually the same as playing with it for 3-5 years.

The battery life and service life are related to the mileage. The mileage with long service life is certainly not much. Who has seen the battery of a "taxi" used for more than 3~years. The main reason for the long service life of the battery is that there is an electronic regulator, which can be charged at idle speed. When the battery is full, the charging current is very small even at high speed... Especially for old batteries, deep discharge is the most feared!

The traditional method can estimate the battery quality according to the voltage and discharge current. There is a kind of test meter with discharge. Two terminals are clamped on the battery, and then press the test button. The high-power resistance wire in the meter starts to burn red and discharge the point cell with large current. At the same time, the pointer of the voltmeter above will display the voltage (usually an icon that directly displays the estimated capacity of the battery). If the meter shows that the capacity is more than 30% lower than the nominal capacity of the battery, then the preliminary estimated battery life is approaching!

The internal resistance can be used to judge whether the electrode plate is damaged. The internal resistance meter can be used to measure, or the dynamic internal resistance method can be used to measure the previous load. If the internal resistance is too large, such as 12v20ah battery, and the internal resistance is greater than 15 milliohms, the electrode plate is damaged and needs to be replaced. In some cases, the internal resistance meter measurement is normal, but the negative plate lead powder falls off, so it must be detected by a discharge tester. If the discharge time is very short, less than 50% of the storage capacity, it can also be replaced.

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