Positive electrode structure of solar battery plate
Technical Field The present invention relates to solar energy utilization Technical Field, more specifically, relates to a kind of the positive electrode structure of the solar cell. Background Art Solar cells, also known as photovoltaic cell, is a direct conversion of light energy of the sun into electric energy of the semiconductor device. Because it is an environment-friendly product, will not cause the environmental pollution, renewable resources and is, therefore, in the case of the current energy shortage, solar battery is the development of a new energy for the future. The manufacture process of the solar cell generally has the following several steps: chemical cleaning and surface texturing processing, diffusion system knot , peripheral etching, deposition anti-reflective film, printed electrode, sintered. The solar cell converts the light energy into electrical energy in the process, its internally-generated photogenerated carriers through the external printing electrode to collect and lead-out, then connecting with external circuit, thus by the electric current. Through the external printing of the electrode not only can be used to collect photo-generated carriers, but also can to the solar battery to be tested, and then selecting a cell of different efficiency, can be in the production of the solar cell assembly is obtained when maximum power output. The reference chart 1, chart 1 as in the prior art of the positive electrode structure of the solar cell in schematic. Generally the positive electrode are made of two bus bar 1 and a plurality of and the states the main grating 1 vertical vice-grating 2 composition, the two bus bar 1 are parallel to each other, the plurality of vice-grating 2 two parallel, and the states the main grating 1 than vice-grating 2 the width of the. Bus bar in the prior art 1 and vice-grating 2 covering the larger area on the silicon chip, the large T-the one hand, on the other hand increase the states the main grating 1 and vice-grating 2 the contact resistance between the silicon chip, will reduce both the utilization efficiency of the solar cell. Furthermore, printed electrode need of valuable metal as the conductive paste, bus bar 1 and vice-grating 2 covering the larger area on the silicon chip will also make use of the conductive paste, therefore, the manufacturing cost of the solar battery is relatively high. Content of the invention In view of this, the present invention provides a positive electrode structure of the solar cell, the positive electrode structure can effectively improve the utilization efficiency of the solar cell, and can reduce the cost of manufacture of the solar cell. To achieve the above object, the present invention provides the following technical scheme: A positive electrode structure of the solar cell, the positive electrode structure comprises: two main grid lines and a plurality of the vertical states the main gratingvice-grating ; wherein, the states the main grating including: hollow section and is connected with the hollowed-out section of the solid section. Preferred, the hollowed-out section comprises: the middle of two sides of the hollow portion and a solid part. Preferably, the solid section comprises: welding section and the test section. Preferably, the hollow section of the solid portion of the two sides of length equal to 12 mm, width is 0.25 mm. Preferably, the hollow section of the hollow portion in the middle of a length of 12 mm, the width is 1.4 mm. Preferably, the number of the said hollow section 5. Preferably, said welding section of a length of 68 mm, the width is 1.9 mm. Preferably, the test section of a length of 7 mm, the width is 1.9 mm. Preferably, the number of the the test section 4. Preferably, the two bus bar distance is 62.5 mm. As can be seen from the above-mentioned technical scheme, the invention offers the positive electrode structure of the solar cell, which comprises: two main grid lines and a plurality of the vertical states the main gratingvice-grating ; wherein, states the main grating including: hollow section and is connected with the hollowed-out section of the solid section. This provided by the invention of the positive electrode structure of the solar cell, the adoption of the new design makes the states the main grating by the hollowed-out section and a solid section, in the prior art, the solid structure bus bar as a whole, hollowed-out section part of the positive electrode can be reduced in the area on the silicon chip, the silicon chip is the contact resistance of the electrode, thereby improving the utilization efficiency of the solar cell; and, in the hollowed-out section of the hollow portion does not need to be filled with the conductive paste, therefore, saves the conductive paste, reduces the manufacturing cost of the solar cell. Description of drawings In order to more clearly illustrate the embodiment of the invention or a technical proposal in the prior art, will be to the embodiment or the prior art to be used in the description for the simple introduction of the Figure, it is obvious that, in the description below only the Figure is some embodiments of the present invention, for one of ordinary skill in the art is concerned, on the premise of a creative work, can also be obtained according to these with other Figures. Figure 1 is a prior art solar cell in a of the positive electrode structure of the schematic; Figure 2 is provided by the embodiment of the invention a solar cell of the positive electrode structure of the schematic; Figure 3 to Figure 2 in Figure 5 is shown in enlarged schematic diagram of part of the structure. Mode of execution In order to make the above-mentioned purposes of this invention, features and advantages will be more clearly understood, the following of the present invention illustrated in the Figure a description of detailed Mode of execution. In the following description of the outlined in many specific details in order to fully understand the invention, but this invention can also adopt the other different from the other methods described herein to implement, the technicians of this field can be contrary to this invention in the case of similar content to promote, therefore, the invention is not influenced by the specific embodiment disclosed below the limit. Secondly, the invention combines schematic detailed description, the CLP of execution of this invention in detail, in order to facilitate the description, said cross section of the device structure according to the general proportion will local amplification, but also the intention states shows is only an example, its in this should not limit the scope of protection of this invention. Furthermore, should be included in the actual production of the length, width and depth of the size of the three-dimensional space. Implementation of the example one As Background Art part of the stated, in the prior art of the positive electrode structure of the solar cell, its bus bar and vice-grating covering the larger area on the silicon chip, the large T of the positive electrode, the positive electrode and the silicon chip contact resistance is large between the, eventually lead to low the utilization efficiency of the solar cell. states the main grating and vice-grating and the larger area on the silicon chip, filling the states the main grating and vice-grating the used when a conductive paste, and the conductive paste is generally a noble metal material, therefore, the manufacturing cost of the solar battery is relatively high. Research by the inventor found that, for generating the above-mentioned phenomenon in the nature of the: and states the main grating in the prior art is the entity structure vice-grating , although the structure of the entity can be conveniently make the weld states the main grating and an external circuit, however, has LED to the low utilization ratio of the solar cell, the production cost is high. Based on this, the present invention provides a positive electrode structure of the solar cell, the positive electrode structure not only can meet the bus bar and the external circuit has very good weldability, and, most importantly, to improve the utilization efficiency of the solar cell, the production cost is reduced. The reference Figure 2, Figure 2 is provided by the embodiment of the invention a solar energy cell schematic diagram of the structure of the positive electrode. The positive electrode structure comprises: two bus bar 3 and a plurality of the bus bar 3 vertical vice-grating 4. Two bus bar 3 are parallel to each other, a plurality of vice-grating 4 states the main grating with the 3 vertical, and the plurality of vice-grating 4 two parallel, any two adjacent vice-grating 4 are equal the spacing between the. The states the main grating 3 including: hollowed-out section 32 and the hollow section 32 of the solid section is connected. The concept of "hollow section" and "solid section" corresponding to, the hollowed-out section 32 in that a hollow part of the paragraph. Solid section, but also comprises a welding section 31 and a test section 33, the welding section 31 is located in the lower end of the structure of this positive electrode, welding section 31 through the hollowed-out section 32 and the test section 33 are connected, the adjacent test section 33 through the hollowed-out section between 32 is connected. Yoshikami can know, provided by the embodiment of the invention the positive electrode structure of the solar cell, because of its bus bar comprises a hollowed-out section and a solid section, and having a hollow part in the hollowed-out section, therefore, compared with the prior art, the bus bar of the positive electrode is covered with smaller area of the silicon wafer, thus can reduce T of the positive electrode, a positive electrode and a reduced contact resistance of the silicon wafer, thereby improving the utilization efficiency of the solar cell. And in the course of the printing electrode, in the hollowed section of the hollow portion does not need to be filled with the conductive paste, the conductive paste can be saved, thereby reducing manufacturing cost of the solar cell. Implementation of the example two In the following detailed description of a specific embodiment of this invention offers the positive electrode structure of the solar cell. Reference to Figure 2, this embodiment the solar cell including the positive electrode structure of the: two bus bar 3 and a plurality of the bus bar 3 vertical vice-grating 4 ; wherein, states the main grating 3 including: hollowed-out section 32 and the hollow section 32 of the solid section is connected. Solid section, but also comprises a welding section 31 and a test section 33, the welding section 31 states the main grating used in the 3 and is used as the bonding pad is connected to an external circuit, the test section 33 is used for through the probe test as a test point. In this embodiment each of the bus bar 3 comprises a welding section 31, four test section 33 and five hollowed-out section 32, of course, the test section 33 and the hollow section 32 is not limited to this number of. The welding section 31 is located in the lower end of the structure of this positive electrode, welding section 31 through the hollowed-out section 32 and the test section 33 are connected, the adjacent test section 33 through the hollowed-out section between 32 is connected. The embodiment the positive electrode structure of the solar cell carrier is 125 mm × 125 mm silicon chip. The solar cell of the positive electrode structure of the bus bar 3 and vice-grating 4 of length equal to 123 mm, bus bar 3 has a width of 1.9 mm, two bus bar 3 for the spacing between the 62.5 mm, vice-grating 4 has a width of 0.09 mm, any two adjacent vice-grating 4 distance is between 2.3 mm. It should be explained that, provided by the present invention of the positive electrode structure of the solar cell, its bus bar in the length of each hollowed-out section is not exactly the same, as shown in Figure 2, the positive electrode located in the upper end of the hollowed-out section of the structure, its length is 10 mm, the remaining four hollowed-out section, its length equal to 12 mm. In this design method, the silicon wafer is under the situation of a certain length, according to the production line of the corresponding equipment and the need to meet the welding, testing, and the like under the condition of a series of conditions obtained by the best design. Therefore, this invention provides only some of the data for the most preferred embodiment, and any restriction to this. Reference to Figure 3, Figure 3 to Figure 2 in Figure 5 is shown in enlarged schematic diagram of part of the structure. Hollowed-out section as shown in the Figure 32 includes: the middle of two sides of the hollow portion and a solid part. The hollowed-out section 32 of the solid part of the length of the two sides of the f 12 mm, width e are 0.25 mm; the hollowed-out section 32 the length of the hollow portion in the middle of the f 12 mm, width h to 1.4 mm, therefore, the width of the main gate d to 1.9 mm. It should be explained that, in the embodiment of the invention in this embodiment through the design so that the hollowed-out section 32 of a length of 12 mm, the width of the two sides of the solid part of 0.25 mm, the width of the middle hollow part to 1.4 mm, the reasons for this kind of design: the test section 33 of the probe with the test instrument I-V to form a good contacting at the same time, increase the hollowed-out section 32 the area of the middle hollow part (the width of the bus bar a), the illumination area can be increased, to increase the probability of collection of photogenerated carriers; however, the hollowed-out section 32 also need to rely on its two sides to a solid part conductive, therefore, the two sides of the width of the solid part should also satisfy a certain condition, that is, the middle hollow part of the area cannot be increased indefinitely. Through several experiments, the inventor found the study, the above-mentioned design method is the most feasible method. Through the above-mentioned design method, can make the positive electrode structure covering the bus bar of the smaller area of the silicon wafer, this T a, on the other hand, reduce the contact resistance of the bus bar and the silicon chip, thereby improving the utilization efficiency of the solar cell; at the same time, the area of the bus bar covers the silicon wafer is relatively small, conductive paste can also be saved, reducing the manufacturing cost of the solar cell. The test section 33 g to the length of 7 mm, width d to 1.9 mm. The test section 33 according to the length of the test should generally be selected position of the probe when the optimum length, preferably the embodiment of the invention, the test section 33 of a length of 7 mm, the probe can be ensured, and sufficient contact with the area of the grating, to ensure the conduction of positive electrode bus bar, and then make the measured electrical property of the battery (in particular the series resistance) is not affected. The welding section 31 c is the length of 68 mm, the width d to 1.9 mm. The welding section 31 and states the main grating used in the external circuit is used as the welding point is connected, therefore, welding section 31 should ensure that the length of the assembly of the solar cell making can meet the requirement of welding, there will be no breaks welds , solder or conductive can be the situation is not good. After numerous experiments and studies by the inventor, to obtain the welding section 31 for optimum length of 68 mm. The plurality of vice-grating 4 to a width of 0.09 mm, any two adjacent vice-grating 4 b is the interval between 2.3 mm. As can be seen from the above-mentioned technical scheme, the invention offers the positive electrode structure of the solar cell, its bus bar comprises a hollowed-out section and a solid section, therefore, light can effectively reduce the area of the electrode, reducing the contact resistance of the electrodes and the silicon wafer, crystal silicon so as to improve the utilization efficiency of the solar cell; and the design structure of the conductive paste can be saved, thereby reducing manufacturing cost of the solar cell. example three implementation Because this provided by the invention of the positive electrode structure of the solar cell of the positive electrode structure of the different from traditional, therefore, in the in the process of screen printing electrode, need to adopt the model, provided by the present invention of a positive electrode of the solar cell which is corresponding to the structure of the Figure, making new screen, thus formed by printing of the positive electrode structure of the required. The positive electrode structure of the bus bar comprises a hollowed-out section and a solid section, the design of the hollowed-out section the use of the conductive paste can be reduced, reducing the production cost of the solar cell; the hollow section so that the electrode covers the design of the area of the silicon wafer, can effectively increase the absorption of the photo-generated carriers, thereby improving the current, voltage, electrical performance is improved. Using two batches of the same sample, in different production process of printing under the positive electrode structure of the solar cell. 1st the 19 samples as shown in Figure 1 in accordance with the traditional production of the positive electrode structure of the solar cell, in the 2nd 19 a sample in accordance with the present embodiment of the manufacturing process as shown in Figure 2 of the positive electrode structure of the solar cell. After these two groups respectively to the test sample. The through the corresponding test: 2nd group of sample in the process of the printing electrode effectively save the conductive paste; and 2nd group compared with the sample of the positive electrode structure of the 1st group of sample, is increased about 10%, the light receiving area, the solar energy can be effectively improved photoelectric conversion efficiency of the cell, to improve its electrical properties. Reference as 1 and table 2, table 1 and table 2 are the 1st and 2nd group of sample test results of the electric property of the sample. Through the two table can be known, provided by the embodiment of the invention the process for producing the solar cell produced, its working current and a short circuit current of the have very large, the maximum power of the battery by the average 2.750W cent to 2.779W, the average conversion efficiency by 17.76% to 17.95%, improving the 0.19%. Therefore, this invention is provided by the embodiment of the of the positive electrode structure of the solar cell, can effectively improve the conversion efficiency of the solar cell, the power of the cell is increased, and can reduce the production cost of the solar cell. For the disclosed embodiment of the above-mentioned description, the field of the professional technical personnel can realize or use of the invention. For these embodiments the multi-kind of modification of the professional technical personnel in this field will be obvious, defined in this text the general principle can be without departing from the spirit of this invention or under the situation of range, is realized in other embodiments. Therefore, the invention will not be limited to the invention as shown in these embodiments, but rather to comply with the principle disclosed herein is consistent and novel characteristics of the most wide range. Table I Table II The embodiment of the invention discloses a positive electrode structure of a solar battery plate. The positive electrode structure comprises two main grid lines and a plurality of ancillary grid lines vertical to the main grid lines, wherein each main grid line comprises a hollowed section and a solid section connected with the hollowed section. Since each main grid line comprises the hollowed section, the area of the positive electrode covering on a silicon wafer can be reduced, the contact resistance between the positive electrode and the silicon wafer can be reduced, and further the utilization ratio of the solar battery plate can be improved; in addition, the hollow part of the hollowed section does not need to be filled with conductive size, so that the conductive size is saved and the manufacturing cost of the solar battery plate is lowered. 1. A positive electrode structure of the solar cell, which comprises: two main grid lines and a plurality of the vertical states the main gratingvice-grating , characterized in that the states the main grating including: hollow section and is connected with the hollowed-out section of the solid section. 2. The positive electrode structure according to Claim 1, characterized in that the hollowed-out section comprises: the middle of two sides of the hollow portion and a solid part. 3. The positive electrode structure according to Claim 1, characterized in that the solid section comprises: welding section and the test section. 4. The positive electrode structure according to Claim 2, characterized in that the hollowed-out section of the solid portion of the two sides of length equal to 12 mm, width is 0.25 mm. 5. The positive electrode structure according to Claim 2, characterized in that the hollow section of the hollow portion in the middle of a length of 12 mm, the width is 1.4 mm. 6. The positive electrode structure according to Claim 2, characterized in that the number of the said hollow section 5. 7. The positive electrode structure according to Claim 3, characterized in that said welding section of a length of 68 mm, the width is 1.9 mm. 8. The positive electrode structure according to Claim 3, characterized in that the test section of a length of 7 mm, the width is 1.9 mm. 9. The positive electrode structure according to Claim 3, characterized in that the number of the the test section 4. 10. Any one of the positive electrode structure according to Claim 1-9, characterized in that the two bus bar distance is 62.5 mm.