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Type and Advantage of Lead-acid Battery 2017-11-09 10:42:43

Lead-acid battery types are more used in photovoltaic energy storage system, there are more than three, rich liquid lead-acid batteries, VRLA batteries, lead carbon storage batteries.

1) rich liquid lead acid batteries

Lead acid battery electrolyte in the sulfuric acid directly involved in the battery charge and discharge reaction process, the traditional lead-acid batteries, the battery compartment to remove the plate, partitions and other solid assembly parts of the remaining space is full of sulfuric acid electrolyte, the electrolyte in surplus Excessive state, it is known as "rich liquid" battery, the battery plate completely soaked in sulfuric acid electrolyte. The top of the liquid-rich battery has a lid capable of venting and capable of blocking the spillage of the liquid. In the course of use, due to the evaporation and decomposition of moisture, it is necessary to periodically add the lid to add distilled water and adjust the electrolyte density. For the "open" battery.

Rich liquid type lead-acid battery is characterized by cheap, long life, the disadvantage is the need for regular maintenance.

2) VRLA batteries

Valve-regulated sealed lead-acid batteries, also known as maintenance-free battery, divided into AGM sealed lead-acid batteries and GEL colloid sealed lead-acid batteries two.

AGM type batteries use pure sulfuric acid aqueous solution as electrolyte, most of which exists in the glass fiber membrane, while the plate inside the suction part of the electrolyte. AGM-type sealed lead-acid battery electrolyte less, the thickness of the plate is thick, the utilization of active material is lower than the open-type battery, so the battery discharge capacity than the open battery is about 10% lower.

AGM sealed lead-acid batteries and today's colloidal battery compared to its discharge capacity to be smaller. And rich liquid type the same specifications than the battery, the price is higher, has the following advantages:

(1) cycle charge capacity than lead calcium battery 3 times higher, with a longer life.

(2) has a higher capacitance stability over the entire life cycle.

(3) low temperature performance is more reliable.

(4) reduce the risk of accidents, reduce the risk of environmental pollution (due to acid 100% sealed).

(5) maintenance is very simple to reduce the depth of discharge.

Colloidal sealed lead-acid battery (ie, GEL-type battery), colloidal lead-acid battery is the liquid electrolyte of the ordinary lead-acid battery improvement, with colloidal electrolyte for the sulfuric acid electrolyte, in the safety, storage capacity, discharge performance and service life And other aspects of the battery has improved compared to ordinary. The electrolyte is composed of silica sol and sulfuric acid, sulfuric acid solution concentration than AGM battery is lower, the amount of electrolyte than AGM type battery to be more, with rich liquid battery quite. This electrolyte exists in colloidal state, filled in the diaphragm and between the positive and negative, sulfuric acid electrolyte surrounded by the gel, will not flow out of the battery.

Colloidal sealed lead-acid batteries have the following advantages:

(1) the probability of small leakage. GEL-type colloidal battery electrolyte electrolyte is no free electro-hydraulic, so the probability of leakage of acid than AGM type battery much smaller.

(2) less water loss. Because of its perfusion than dilute sulfuric acid, less water loss, so the colloidal battery will not cause failure due to water loss.

(3) effectively extend battery life. The filling of the colloid increases the strength of the separator, protects the plate, makes up for the defects of the acidity of the partition, so that the assembly pressure is not significantly reduced is one of the reasons for its extended battery life.

(4) colloidal lead-acid battery anti-overcharge capacity.

(5) strong recovery in the case of strong recovery capacity. Colloid filled with the gap between the separator and the plate, reducing the battery resistance, charging capacity can be improved.

So the colloid battery over discharge, recovery and low temperature charge and discharge performance than AGM battery superior.

(6) body lead-acid battery self-discharge performance, in the same sulfuric acid purity and water quality, the battery storage time can be extended more than 2 times.

(7) colloidal lead-acid batteries in the case of severe power shortage, anti-vulcanization performance is obvious.

(8) colloidal lead-acid battery late discharge performance.

3) lead carbon battery

Lead charcoal battery is a capacitive lead-acid battery, is evolved from the traditional lead-acid battery technology, it is in the lead-acid battery anode by adding activated carbon, can significantly improve the life of lead-acid batteries.

Lead carbon battery is a new type of super battery, combined with both lead-acid battery and super capacitor advantages:

(1) both play a super capacitor instantaneous large-capacity charging advantages, but also play a lead-acid battery than the energy advantage, and has a very good charge and discharge performance.

(2) battery life extension. Due to the addition of carbon (graphene), to prevent the phenomenon of negative sulfation, improved battery failure in the past a factor to extend the battery life.

(3) cost of electricity down.

Lead carbon battery is the most advanced technology in the field of lead-acid batteries, but also the development of new energy and energy industry focus, has a very broad application prospects. Widely used in photovoltaic power plant energy storage, wind power storage and power grid peak and other energy storage areas.

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