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What kind of battery is used for photovoltaic power generation?
- Jul 10, 2018 -

The photovoltaic battery is the application of the battery in the photovoltaic power generation. At present, there are four kinds of lead-acid battery, ordinary lead acid battery, colloidal battery and alkaline nickel cadmium battery. Among them, lead-acid maintenance free battery and colloid battery are widely used because of their inherent "free" maintenance characteristics and less pollution to the environment. It is very suitable for the reliable performance of the photovoltaic power system, especially the unattended workstation.

Which kinds of batteries are used in photovoltaic power generation?

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1. Lead-acid maintenance-free battery

The biggest feature is "maintenance-free", and the consumption of lead-acid batteries is very small compared to its electrolyte, and it is basically unnecessary to replenish distilled water during the service life. It also has the characteristics of shock resistance, high temperature resistance, small size and small self-discharge. In contrast, its price will be more expensive than lead-acid batteries. As for the service life, the recommended replacement period for maintenance-free batteries under normal conditions is about 3 years, which is equivalent to lead-acid batteries.

2. Ordinary lead-acid battery

The battery was invented by the Frenchman Plante in 1859 and has a history of more than 100 years. The battery is mainly composed of a tubular positive plate, a negative plate, an electrolyte, a separator, a battery tank, a battery cover, a pole, and a liquid injection cover. The main advantage is that the voltage is stable and the price is cheap; the disadvantage is that the specific energy is low (the energy stored per kilogram of battery), the service life is short, and the daily maintenance is frequent. Old-fashioned ordinary batteries generally have a life span of about 2 years, and the height of the electrolyte is regularly checked and distilled water is added. However, with the development of technology, the life of lead-acid batteries has become longer and the maintenance is simpler.

3. Colloidal battery

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 improved compared with the ordinary battery in terms of safety, storage capacity, discharge performance and service life. There is no free liquid inside, the electrolyte volume is large under the same volume, the heat capacity is large, the heat dissipation ability is strong, and the general battery is easy to generate thermal runaway phenomenon; the electrolyte concentration is low, the corrosion effect on the plate is weak; the concentration is uniform, there is no electrolysis Liquid stratification.

4. Alkaline nickel cadmium battery

Nickel cadmium battery (Nickel cadmium ') the positive active material is mainly made of Nickel cathode active material is mainly made of cadmium a alkaline battery. Positive nickel hydroxide, negative cadmium, electrolyte is potassium hydroxide solution. Its advantages are light, seismic, long life, often used in small electronic equipment. Nickel-cadmium batteries can be charged quickly and have a long cycle life, more than twice that of lead-acid batteries and can reach more than 2,000 times, but the price is 4-5 times that of lead-acid batteries. Although its initial purchase cost is high, its actual long-term use cost is not high because of its advantages in energy color quantity and service life. However, recycling should be done in use, otherwise heavy metal cadmium will pollute the environment.

When selecting batteries, it is very necessary to understand the differences between various batteries in technology and in use. First of all, it is necessary to fully understand the user's demand for products. Such as back-up power system capacity requirements, frequency of use, use of environment, the main purpose, service life and reliability requirements, instantaneous discharge rate, the specifications of the rectifier and other performance requirements related to battery. Second to understand the battery's performance, including product design parameters (the model of battery, appearance size, rated capacity, rated voltage, weight, volume, weight than energy than energy, design life, the number of positive and negative plate piece, the positive and negative plate thickness ratio, the density of the electrolyte, the type of plate, plate gate materials, etc.), product performance parameters, actual use of the product life, install and use environment, different models of performance and price, different kinds of product warranty, etc.