Solar cell is a kind of photoelectric semiconductor chip that uses sunlight to generate electricity directly, also known as “solar chip” or “photocell”. As long as it is satisfied with certain illuminance conditions of light, it can output voltage and generate current in the case of a loop. Solar cells are devices that directly convert light energy into electricity through photoelectric or photochemical effects.
Solar cell components and functions of each part:
1, toughened glass: its role is to protect the main body of power generation (such as battery), its selection of light transmission is required: 1. Light transmittance must be high (generally above 91%); 2. Super white toughening treatment.
2, EVA: Fixed toughened glass used for bonding and power main body (e.g., battery), the merits of the transparent EVA material directly affect the life of the components, exposed to the air in the EVA aging yellow, thus affect the light transmittance of the component, thus affect the quality of the component’s power in addition to the quality of EVA itself, the component manufacturer of laminating process influence is very big, Such as EVA adhesive degree is not up to standard, EVA and toughened glass, backplane bonding strength is not enough, will cause early aging of EVA, affect the life of components. The main bonding package power generation body and backplane.
3, battery: the main role is power generation, power generation main market mainstream is crystalline silicon solar cells, thin film solar cells, both have advantages and disadvantages. Crystalline silicon solar cell, the equipment cost is relatively low, photoelectric conversion efficiency is also high, in the outdoor sunlight is more suitable for power generation, but the consumption and cell cost is very high; Thin film solar cells, low consumption and battery cost, low light effect is very good, in ordinary light can also generate electricity, but relatively high equipment cost, photoelectric conversion efficiency than crystal silicon cells more than half, such as the solar cells on the calculator.
4, the back plane: function, sealing, insulation, waterproof (generally used TPT, TPE and other materials must be aging resistance, most component manufacturers are 25 years of warranty, tempered glass, aluminum alloy is generally no problem, the key is with the back plane and silica gel can meet the requirements.)
5, aluminum alloy protective laminate parts, play a certain sealing, supporting role.
6, junction box: protect the whole power generation system, play the role of current transfer station, if the component short circuit junction box automatically disconnects the short circuit battery string, prevent burning the whole system connection, the most critical thing in the wire box is the selection of diode, according to the type of battery in the component is different, the corresponding diode is not the same.
7, silica gel: sealing function, used to seal components and aluminum alloy frame, components and junction box junction. Some companies use double-sided tape, foam to replace silica gel, silica gel is widely used in China, the process is simple, convenient, easy to operate, and the cost is very low.
Post time: Oct-10-2022