Lead-acid battery refers to a battery in which the electrode is mainly made of lead and its oxide, and the electrolyte is a sulfuric acid solution. In the charged state, the main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead; in the discharged state, the main components of the positive and negative electrodes are lead sulfate.
Lead-acid batteries are a commonly used power supply device. Lead-acid batteries are indispensable in many types of equipment such as batteries and electric vehicles. That's because the plates of lead-acid batteries are composed of lead and lead oxides, and the electrolyte is an aqueous solution of sulfuric acid. Its main advantages are stable voltage and low price; its disadvantages are lower specific energy (ie, the energy stored per kilogram of battery), short service life, and frequent daily maintenance. The life of this battery is generally about 2-3 years. If used and maintained properly, it can be used for more than 4 years. If used and maintained improperly, they can be damaged early in a few months.
The most obvious feature of a lead-acid battery is that it has 6 screwable plastic sealing caps on the top, and there are vent holes on it. These sealing caps are used to fill and check the electrolyte and exhaust gas. Theoretically, the lead-acid battery needs to check the height of the electrolyte at each maintenance, and if there is a shortage, add distilled water.
It is therefore important to check the battery fluid level regularly. When the battery is low, add distilled water to the proper level. After adding distilled water to the battery, we should check the density of the battery fluid and always keep the density of the battery fluid within a reasonable range. What needs to be reminded here is that the water supply issues mentioned below are for old non-maintenance-free batteries (that is, lead-acid batteries). In recent years, construction machinery products have been shipped with lifetime maintenance-free as standard There is no such thing as a battery.
The liquid level of the lead-acid battery electrolyte directly affects the stored energy and work safety of the lead-acid battery. At present, most of the lead-acid battery liquid level detection on the market is direct contact. Due to the small detection position of the test object and the corrosive nature of the liquid, the conventional detection methods are not suitable for this, either do not detect, or have a long life. very short.
Aiming at the problem of continuous measurement of the electrolyte level of lead-acid batteries, a liquid level switch / level sensor provided by Industrial Mining Network, LLC101000, a Honeywell LLE series replacement, uses infrared LEDs and phototransistors to accurately locate the bottom of the switch tip. When the tip is in the air, infrared light from the LED is reflected inside the tip and returns to the phototransistor. When the tip of the switch is immersed in the liquid, infrared light escapes from the tip, causing the light amount of the phototransistor to change, which causes the output to change state. Their ability to work in high operating temperatures and harsh liquid media makes the sensors extremely reliable and can be used in extreme conditions. The photoelectric liquid level switch has good detection accuracy control, good repeatability, error is less than 1MM, and there is no obvious hysteresis in clear water detection. The reflection time of liquid level rise and fall is fast, and the maximum error of single point alarm is less than 3MM. It was placed in a sulfuric acid solution with a density of about 1.258 / cm3 and oily soil. After being left for 100 hours, the test data showed that after long-term immersion, it worked normally without any significant change in accuracy and without significant hysteresis. The level switches are compact, which means they can be adapted to applications with limited space, and they can also respond very quickly to small amounts of liquid.