God said that if there is light, then the world will have light. Sunshine is one of the necessary factors for the growth of all things. It seems to be inexhaustible. Therefore, solar energy has become the most “future-style†energy that wind and hydropower have been favored by the public. The reason for adding the "future-style" prefix is ​​because solar energy is still in its early stages of development. Although there are many advantages in solar energy resources, the domestic solar energy industry has always been oversupply because of weak energy conversion capabilities and insufficient utilization of resources.
The development of solar energy probably dates back to the middle of the 19th century. At that time, inventions concerning the use of steam power to generate electricity made people realize that heat and electricity can be transformed into each other, and solar energy is the most direct source of heat energy. At present, solar panels are probably the most widely used products in the civilian market. They can absorb sunlight and direct or indirectly convert solar radiation into electricity through photoelectric or photochemical effects.
The difference between solar cells and lithium batteries
Solar panels are made by splicing solar cells. When exposed to sunlight, they can instantaneously output voltage and generate current in a loop. If you do not consider the technical factors, solar energy - solar energy alone, solar cells is undoubtedly the perfect choice to kill all current types of batteries. However, solar cells are mostly used in large fixed sites such as transportation, communications, and military fields, and they do not seem to have much effect on the rapidly developing consumer electronics industry. If one day, solar cells can be "slimming down" and applied to mobile electronic devices, it will certainly bring about a change in the overall direction of the entire technology industry.
Most of today's smart electronics are recyclable lithium batteries. In particular, mobile electronic devices, because of their light weight, portability, and large number of application functions, users are not limited by environmental conditions during use, and they have a long operating time. Therefore, lithium batteries have become the most common choice despite their shortcomings.
Although solar cells and lithium batteries sound the same type of product, it is not always the case. There are still the most essential differences between the two. In simple terms, a solar cell is a kind of power generation device, which itself cannot directly store electric energy. A lithium battery is a type of battery and can continuously store electricity for users.
Compared with lithium batteries, a disadvantage of solar cells reveals that it is impossible to escape from the sunlight. Converting solar energy into electricity is synchronized with sunshine in real time. Therefore, for solar energy, only daytime or even sunny days is its own. At home, but not as full of electricity as lithium batteries, you can completely get rid of time and environmental constraints, and use it flexibly.
Solar cell "slimming" difficulties
Because solar cells do not store electrical energy by themselves, it is a very big bug for practical applications. Therefore, R&D personnel are in a hurry to use solar cells in conjunction with large-capacity batteries. Lead-acid batteries are widely used in solar power systems. Large-capacity battery. The combination of the two products will make the solar cells that are already small in size even more "huge." If you want to use them in mobile devices, you must first go through the "downsizing" process.
Because the conversion rate of energy is not high, the solar radiation area of ​​the solar cell is usually larger, which is the first major technical difficulty faced by its “downsizingâ€. The current limit of solar energy conversion is about 24%. Compared with the production of expensive solar panels, unless it is used in large areas, the utility will be greatly reduced, not to mention being used in mobile devices.
Because the energy conversion rate is not high, the solar radiation area is usually larger.
How to "thin" solar cells?
The use of solar cells in combination with lithium batteries that can be cycled is one of the current directions of research and development by researchers, and it is also an effective way to move solar cells. The most common solar battery portable product is mobile power. By converting light energy into electrical energy and storing it in a built-in lithium battery, solar mobile power can charge mobile phones, digital cameras, tablet computers and other products, saving energy and protecting the environment.
There are two main types of solar cells that can be truly industrialized: the first category is crystalline silicon cells, including polysilicon and monocrystalline silicon cells, which account for more than 80% of the market share; the second category is thin-film batteries, which are subdivided into Amorphous silicon cells have a simple process, low cost, but low efficiency and signs of recession.
Thin film solar cells have a thickness of only a few millimeters, and can be folded and folded. They can also use a variety of different materials as substrate materials. They can be charged directly with lithium batteries, which means that the development of solar cells has become a new type of environmentally-friendly charger. Still very possible. And this kind of charger can be presented in different shapes, and it will be more convenient to carry it on. For example, if it is hung on a bag or clothes, it will be able to charge the mobile phone, and the problem of endurance will be solved.
Now many developers think that the graphene lithium battery is an important breakthrough to solve the battery life of mobile electronic devices. If it can effectively improve the conversion rate per unit area of ​​solar cells, then the cool form of mobile charging anytime, anywhere will become the energy of the future. The perfect way to apply the problem.
Solar energy is the most generous gift from nature, but the use of solar energy is not very popular. The use of solar energy also has the problems of high cost and low conversion efficiency. Only by effectively increasing the conversion rate of solar energy per unit area, can we effectively use energy and realize the perfect transition of solar energy—electric energy. At that time, the mobilization of solar cells will no longer be a problem.
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