How to charge the gel battery

Do not wait for the gel battery to run out of charge and recharge it. After the discharge, it should be charged in time.

The battery charger should try to use a better quality charger, which will help to improve the life of the gel battery.

The battery should be fully charged, and the storage should be cool and dry. Do not get close to the heat source, and do not expose it to direct sunlight. It should be replenished before being stored for more than one month for deep storage for more than three months.

When charging in the hot weather, please pay attention to the battery temperature is not too high, do not charge the battery, if the hand touches too hot, you can stop and recharge. In winter, the temperature is low, the battery is easily charged, and the charging time (for example, 10%) can be appropriately extended.

If it is a group of batteries, when the problem is found, only the problem should be replaced in time, which can extend the life of the whole group]

There are three common methods for charging lead-acid batteries:

1: Pulse charging, a simple and economical method is that the low-voltage AC rectification of the secondary output of the transformer is pulsating DC (no filtering) to charge the battery. This method has a large charging current and a fast charging speed. The disadvantage is that when the grid voltage fluctuates, the charging current also fluctuates. This method is rarely used for maintenance-free sealed lead-acid batteries due to large charging current, high battery temperature, and large electrolyte loss, resulting in battery damage. "Copyright Notice: This article is provided by the organizer. Some of the content comes from the Internet. If there is any violation of your rights, please contact us for correction.

2. Use constant current charging to prevent the temperature rise in the battery from being too high and the loss of the electrolyte is too large. The charging current is adjusted to be relatively small, and the charging time is long. On the other hand, if the charging time is too long, overcharge will occur and the overcharge will be prevented. To charge and damage the battery, an overcharge detection or timing circuit is required. "Copyright Notice: This article is provided by the organizer. Some of the content comes from the Internet. If there is any violation of your rights, please contact us for correction.

3. Constant voltage charging, both theory and practice have proved that when the charging voltage is lower than the upper limit of the charging voltage (for 12V batteries, this value is safe), even if the charging time is long, there is no danger, the battery is still Can work on floating charge. "Copyright Notice: This article is provided by the organizer. Some of the content comes from the Internet. If there is any violation of your rights, please contact us for correction.

The colloidal lead-acid battery is an improvement of the ordinary lead-acid battery for the liquid electrolyte. The colloidal electrolyte is substituted for the sulfuric acid electrolyte, which is better than the ordinary battery in terms of safety, storage capacity, discharge performance and service life.

The colloidal lead-acid battery adopts a gel electrolyte, and there is no free liquid inside. The electrolyte capacity is large under the same volume, the heat capacity is large, and the heat dissipation ability is strong, which can avoid the thermal runaway phenomenon of the general battery; the electrolyte concentration is low, and the plate is low. The corrosion effect is weak; the concentration is uniform, and there is no electrolyte stratification.

The performance of colloidal lead-acid battery is better than that of valve-regulated sealed lead-acid battery. The colloidal lead-acid battery has stable performance, high reliability, long service life, adaptability to ambient temperature (high and low temperature), and can withstand long-term discharge capacity , cycle discharge capacity, deep discharge and high current discharge capacity, overcharge and over discharge self-protection.

The domestic colloidal lead-acid battery used for electric bicycle is vacuum infused in the AGM separator, and the silica gel and sulfuric acid solution are poured between the positive and negative plates of the battery. The colloidal lead-acid battery cannot be circulated in the initial stage of use. This is because the colloid encloses both the positive and negative plates. The oxygen generated on the positive plate cannot diffuse to the negative plate, and the lead reduction of the active material on the negative plate cannot be achieved. It can only be discharged by the exhaust valve, which is consistent with the flooded battery.

After the colloidal lead-acid battery is used for a period of time, the colloid begins to crack and shrink, causing cracks, and oxygen passes through the crack directly to the negative plate for oxygen circulation. The exhaust valve is no longer open frequently, and the colloidal lead-acid battery is close to the sealing work, with little water loss. Therefore, the main failure of the electric bicycle battery is the water loss mechanism. The use of the colloidal lead-acid battery can achieve very good results. The colloidal electrolyte is obtained by adding a gelling agent to the electrolyte to solidify the sulfuric acid electrolyte into a gelatinous substance. Usually, the colloidal electrolyte is further provided with a colloidal stabilizer and a compatibilizer, and some colloidal formulas are also added to delay the colloid solidification and retardation to facilitate the filling of the gel.

Fumed silica

The colloidal battery gel is fumed silica. The fumed silica is a high-purity white odorless nano-powder material with thickening, anti-caking, control system rheology and thixotropic effects in addition to traditional it has been widely used in colloidal batteries in recent years.

Fumed silica is a nano-scale white powder formed by the high temperature hydrolysis of silicon halide in a oxyhydrogen flame. It is commonly known as fumed silica. It is an amorphous silica product with a primary particle size of 7-40 nm. The aggregate has a particle size of about 200-500 nm, a specific surface area of 100-400 m2/g, a high purity, and a SiO2 content of not less than 99.8%. The surface untreated fumed silica aggregates contain a plurality of silanol groups, one is an isolated, undisturbed free hydroxyl group; and the other is a bonded silanol group which forms hydrogen bonds with each other. The surface untreated fumed silica aggregate is an aggregate containing a plurality of -OH, which easily forms a uniform three-dimensional network structure (hydrogen bond) in a liquid system. When the three-dimensional network structure (hydrogen bond) has an external force (shear force, electric field force, etc.), the medium is thinned, the viscosity is lowered, and once the external force disappears, the three-dimensional structure (hydrogen bond) recovers itself and the viscosity rises, that is, This thixotropy is reversible.

Fumed silica is mainly used in colloidal storage batteries for its excellent thickening thixotropic properties. The colloidal electrolyte is composed of fumed silica and a certain concentration of sulfuric acid solution in a certain proportion. Sulfuric acid and water in this electrolyte It is "stored" in a silicone gel network and is a "soft solid gel" that appears solid when stationary. When the battery is charged, due to the increase of the concentration of sulfuric acid in the electrolyte, it is "thickened" and accompanied by cracks. The "electrolyzed water" reaction in the later stage of charging causes the oxygen generated by the positive electrode to be absorbed by the negative electrode through the numerous cracks, and further It is reduced to water to achieve a battery seal cycle reaction. The concentration of sulfuric acid in the electrolyte at the time of discharge makes it "thinning" and becomes a thin state of the gel before the battery is poured. Therefore, the gel battery has a "maintenance-free" effect. The use of fumed silica at home and abroad is Degussa's AEROSIL200.

Excellent properties of colloidal batteries

1. Can significantly extend the life of the battery. According to the relevant literature, the battery life can be extended by 2-3 times.

2. The self-discharge performance of the colloidal lead-acid battery has been significantly improved. Under the same sulfuric acid purity and water quality, the storage time of the battery can be extended by more than 2 times.

3. The colloidal lead-acid battery has obvious anti-vulcanization performance in the case of severe power shortage.

4. Colloidal lead-acid batteries have strong recovery ability under severe discharge conditions.

5. Colloidal lead-acid battery anti-overcharge ability, through two lead-acid batteries (a colloidal lead-acid battery, a valve-controlled sealed lead-acid battery) also repeated several overcharge test, colloidal lead-acid battery capacity The drop is slower, and the valve-regulated sealed lead-acid battery has a significant drop in capacity due to excessive water consumption.

6. The late discharge performance of the colloidal lead-acid battery has been significantly improved.

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