The safety valve of the valve-regulated sealed lead-acid battery is also called the throttle valve. Today, Hebei Bangborun Power Generation will introduce to you the function of safety valve, the structure of safety valve and the working method of safety valve. For everyone to learn and reference.

​In an acidic environment, the PE separator will accelerate its own aging as the temperature rises. After use, the PE separator has different degrees of grid indentation on the contact surface of the front plate. It is obvious that all parts of the separator are oxidized and damaged. It exists in the direction of the indentation, and the direction in which the separator is embrittled and falls off to form holes is the direction of the grid. The microstructure of the PE separator changed significantly before and after oxidation, and a large number of lead sulfate particles adhered to the inside and outside of the oxidized PE separator; the oxidation of the PE separator usually occurred in the direction of the positive plate, because the positive plate was charged during the charging process. During the process, the temperature of the electrode plate is continuously increased, and the temperature of the solution is also continuously increased.

Environmental performance: This product uses high molecular weight silica gel electrolyte instead of sulfuric acid, which solves the environmental pollution problems such as acid mist overflow and interface corrosion that have always existed in the production and use process, and can be used as fertilizer. Non-polluting, easy to handle, and the battery grid can also be recycled.

The quality of the separator will directly affect the capacity, charge-discharge cycle life and self-discharge performance of the battery. The analysis results of the battery show that the main reason for the low cycle life of the battery is that the diaphragm with poor quality has a relatively large pore size, and the pore size distribution and thickness are not uniform, so as the charging and discharging progress, the positive lead powder gradually penetrates a small amount The separator goes to the side of the negative electrode, and the negative lead dendrite may penetrate the separator and eventually cause a chronic short circuit of the battery.

Structure and properties of ultra-fine glass fiber separators This kind of separator is composed of ultra-fine glass fibers with a diameter of 0.5~4um without any organic binder. The non-compressed glass fiber paper is made by the papermaking method, and its structure is multi-layered mat-like, and relatively small and high labyrinth free channels are formed by disordered glass fibers. The separator has significantly better performance than ordinary battery separators in many aspects.

In the 1950s, starting batteries mainly used wooden separators. Because they had to be used in wet conditions, the negative plates were easily oxidized, and the initial charging time was long, and they could not be used for dry-charged lead batteries. In particular, wooden separators are not resistant to oxidation and corrosion in sulfuric acid, resulting in short battery life. In order to improve the life of lead-acid batteries, it is proposed to use wood separators and glass wool as separators, which doubles the life of the battery, but the internal resistance of the battery increases, which has an adverse effect on the battery capacity and starting discharge, and can also meet the standard requirements at that time.

Ultra-fine fiberglass separator At present, ultra-fine glass fiber separator (AGM) is commonly used in VRLA batteries. The wettability is the main characteristic of the separator capable of adsorbing the maximum amount of electrolyte. The separator must have long-term stable chemical and electrochemical corrosion resistance in the battery, it must not release any substances that increase the gas evolution rate, corrosion or self-discharge, and it must have good tensile strength to ensure that the separator is in the battery. will not be punctured by sharp edges or small particles during production assembly.

The separator is an important component of the battery and is not an active substance. In some cases it even plays a decisive role. The material itself is an electronic insulator, and its porosity makes it ionically conductive. The resistance of the separator is an important performance of the separator, which is determined by the thickness of the separator, the porosity, and the degree of tortuosity of the hole, and has an important influence on the capacity and terminal voltage level of the high-rate discharge of the battery; The stability of the separator in sulfuric acid directly affects the life of the battery; The elasticity of the separator can delay the shedding of the positive active material; the pore size of the separator affects the short-circuit degree of lead dendrites. Due to the various effects of the separator on the performance of the lead-acid battery, every improvement in the quality of the separator is accompanied by the improvement of the performance of the lead-acid battery.

After the UPS battery has been used for a period of time, the UPS battery will experience different degrees of loss. In order to save maintenance costs, some users will replace the battery with larger loss with a new one. However, many users do not know that this approach will greatly shorten the service life of the battery. Because there are more chemical reaction substances in the new battery, the voltage at the battery terminal is higher and the resistance is lower. However, the terminal voltage of the old battery is low and the internal resistance is large.

In the use of UPS batteries, sometimes new and old UPS batteries are used in series. As everyone knows, this approach will shorten the service life of UPS batteries. Because the new UPS battery has more chemical reaction substances, the terminal voltage is high, and the internal resistance is small (the internal resistance of the new 12V UPS battery is only 0.015-0.018Ω); while the terminal voltage of the old UPS battery is low, the internal resistance is large (12V The internal resistance of the old UPS battery is above 0.085Ω).

(1) Characteristics of premature loss of capacity: When low antimony or lead-calcium is the grid alloy, the capacity suddenly drops in the early stage of battery use (about 20 cycles), which makes the battery ineffective. Almost every cycle the battery capacity will drop by 5%, and the rate of capacity drop is faster and earlier. In the past few years, the batteries of the lead-calcium alloy series often appeared inexplicably with a decrease in the capacity of several batteries. Analysis of the positive plate did not soften, but the positive plate capacity is extremely low.

The failure of lead-acid batteries is the result of a combination of many factors, which is determined by the internal factors of the plates, such as the composition of active substances. Crystal form, porosity, plate size, grid material and structure, etc., also depend on a series of external factors, such as discharge current density, electrolyte concentration and temperature, discharge depth, maintenance conditions and storage time. The main external factors are described here.