What is the difference between the two types of valve sealing lead-acid batteries, how to distinguish?

　　Author ：Iflowpower – Portable Power Station Supplier

The two battery poles are the same: the positive plate grid is used with lead calcium tin aluminum quadruple alloy or low bismuth multi-unit alloy, and the negative plate grid is used with lead calcium tin aluminum four yuan alloy. And use the tight matching and lean oil design, set a unidirectional safety valve in the upper cover of the battery. Due to the adoption of non-chalrotic lead calcium tetramorial alloy, the negative electrode analysis is increased, thereby inhibiting the precipitation of hydrogen, while using a special safety valve to keep the battery to maintain a certain internal pressure.

The two battery separators are different: ie, a microfiber cotton (AGM) separator and silica gel, respectively, to fix the sulfuric acid electrolyte. They all use the principle of cathode absorption so that the battery is sealed, but the channel to the positive absorption of oxygen to the negative supply is different. For the AGM sealed lead-acid battery, although most of the electrolyte of the battery is maintained, 10% of the diaphragm pores must not enter the electrolyte.

The oxygen generated by the positive electrode is to be absorbed by the negative electrode through this part of the pore. For colloidal sealing lead-acid batteries, the silicone gel in the battery is a three-dimensional multi-well mesh structure composed of SiO2 as a skeleton, which hides the electrolyte inside. After the battery-perfusion silica is gel, the skeleton should be further contracted, and the gel occurs between the gel between the positive and negative plates, and the oxygen to the positive electrode is supplied to the passage of the negative electrode.

From this, the difference between the two batteries is that the method of supplying oxygen to reach the negative electrode channel is different, so the performance of the two batteries has a thousand autumn. Whether using a glass fiber diaphragm-type sealed battery (hereinafter referred to as an AGM sealing battery) or a crimp type sealing battery (hereinafter referred to as a colloidal sealed battery), they are sealing the battery by the principle of cathode absorption. When the battery is charged, the positive electrode will precipitate oxygen, and the negative electrode will precipitate hydrogen.

The positive polarion is started when the positive charge is 70%. The precipitated oxygen reached the negative electrode, and the reaction was reached with the negative electrode to achieve the purpose of cathode absorption. Negative electroxide begins to start at 90%, and then add the reduction use of oxygen in the negative electrode and the increase in hydrogen excessive potential of the negative electrode itself, thereby preventing a large amount of hydrogenation reaction.

For the AGM sealing battery, although most of the electrolytic solutions are maintained in the AGM diaphragm, 10% of the separator pores must not enter the electrolyte. The oxygen generated by the positive electrode is to be absorbed by the negative electrode through this part of the pore. For colloidal sealed batteries, the silicone gel in the battery is a three-dimensional multi-hole mesh consisting of SiQ as a skeleton.

It hides the electrolyte in the inside. After the battery-perfusion silica is gel, the skeleton should be further contracted, and the gel occurs between the cracked between the positive and negative plates, and supplies the oxygen to the positive electrode to the channel to the negative electrode. From this, it is seen that the sealing working principle of the two batteries is the same, and the difference is that the fixed mode of the electrolyte and supply oxygen reaches the negative electrode channel vary.

Third, an important difference in the battery structure and process AGM sealing battery uses pure sulfuric acid aqueous solution of electrolyte, its density is 1.291.3lg / cm3.

In addition to the inner portion of the polar plate with a part of the electrolyte, most of which exist in the glass fiber membrane. In order to supply the oxygen supply of the positive absorption to the negative channel, the diaphragm must maintain 10% of the pores without being occupied by the electrolytic solution, i.e.

, a poor liquid design. In order to make the plates fully contact the electrolyte, the polar group uses a suitable method. In addition, in order to ensure that the battery has sufficient life, the plate should be designed to be thick and the positive plate grid alloy uses PB.

’-Q2W-SRR - A1 four yuan alloy. The electrolyte of the colloidal sealed battery is made of silica sol and sulfuric acid, the concentration of the sulfuric acid solution is lower than the AGM battery, usually 1.26 ~ 1.

28g / cm3. The amount of electrolyte is 20% higher than the AGM battery, which is comparable to the rich liquid battery. This electrolyte is present in a colloidal state, which is filled between the diaphragm and the positive and negative electrode, and the sulfuric acid electrolyte is surrounded by a gel, and does not flow out of the battery.

Since such a battery is a rich liquid-type non-tightening structure, the positive electrode plate gate material can be used with a low bismuth alloy, or a tubular battery positive plate can also be used. At the same time, in order to improve the battery capacity, it does not reduce the battery life, and the plate can be thin. The internal space of the battery cell can be expanded.

Fourth, the discharge capacity of the colloidal battery in the initial stage of battery discharge capacity is only about 80% of the rich liquid battery, which is due to directly inducting a gestured electrolyte directly in the unregraph of unreachable liquid, within the battery. Large resistance, dense ion migration in electrolytes. Recent research work shows that improved colloidal electrolyte formula, control collagen size, adult hydrophilic polymer additive, reduce the concentration of the collagen to improve the permeability and the parental force of the plate, using a vacuum filling process, composite Board or AGM separator replaces rubber separator, improves battery suction liquid; cancel the precipitation tank of the battery, moderately increase the content of the active material of the plate area, as a result, the discharge capacity of the colloidal seal battery reaches or proximate the horizontal of the open storage battery.

The amount of electrolytic solution of the AGM-type sealed battery is small, the thickness of the polar plate is thick, and the active material utilization is lower than the opening battery, so the discharge capacity of the battery is about 10% lower than the opening battery. Compared with today's colloidal sealing battery, its discharge capacity is small. V.

The internal resistance of the battery and the large current discharge capacity battery is composed of ohmic internal resistance, concentration polarization internal resistance, and electrochemical polarization internal resistance. The former includes a plate, lead part, an electrolyte, azole resistance. The glass fiber separator used in the AGM sealing battery has 90% pore rate, and sulfuric acid adsorbed therein, and the battery is in a tight formation form, and the impedance of ions in the separator is small, so the AGM sealing battery has a low internal Blocking, high current fast discharge ability is strong.

The electrolyte of the colloidal sealed battery is a silicone gel. Although the diffusion velocity in the gel is close to the diffusion velocity in the aqueous solution, the migration and diffusion of ions are affected by the gel structure, and the pathway of ions diffuse in the gel. The more bent, the narrower the pores in the structure, the greater the obstacleness.

Therefore, the inclusion of the colloidal storage battery is larger than the AGM sealed battery. However, the test results indicate that the high current discharge performance of the colloidal sealing battery is still very good, fully meet the requirements of the high current discharge performance in sealing battery in the relevant standards. This may be critical due to the use of acids and other relevant ions in the liquid layer near the porous electrode and other relevant ions in the large current discharge.