Sintering furnace and battery piece

Abstract

The invention relates to the technical field of solar photovoltaics, in particular to a sintering furnace and a battery piece. In the sintering furnace, a furnace cavity, a first gas inlet and a second gas inlet are formed in a furnace body, the furnace cavity communicates with the first gas inlet and the second gas inlet, and the first gas inlet and the second gas inlet are configured to introduce gas into the furnace cavity; the conveying mechanism moves along a path penetrating through the furnace chamber, the conveying mechanism is provided with a first conveying area and a second conveying area, the first conveying area and the second conveying area are arranged in a spaced mode in the conveying direction perpendicular to the conveying mechanism, and the first conveying area and the second conveying area are used for bearing battery pieces respectively; the first air inlet corresponds to the furnace body wall of the first conveying area, and the second air inlet corresponds to the furnace body wall of the second conveying area. Gas is introduced through the first gas inlet and the second gas inlet, the temperature difference of the furnace chamber in the conveying direction perpendicular to the conveying mechanism can be improved, and the efficiency of battery pieces is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of solar photovoltaics, and particularly relates to a sintering furnace and a battery cell. Background Art

[0002] During the production process of solar battery cells, a sintering process is required. In the sintering process, a eutectic reaction occurs between the metal electrode material and the surface of the silicon wafer through high-temperature sintering, and metal atoms and silicon atoms diffuse into each other to form an alloy layer, achieving a low-resistance ohmic contact. The sintering process is carried out in a sintering furnace.

[0003] In the traditional solution, after producing a whole battery cell, it is then cut into half cells. However, during this process, the battery cells will be severely damaged (for example, efficiency loss, increased fragmentation rate, etc.). Therefore, currently, half cells are directly produced at the battery end. The sintering furnace in the current technology is used for sintering whole battery cells, and when using the current sintering furnace to sinter half cells, the sintering efficiency of the battery cells is low. Summary of the Invention

[0004] In view of this, the present invention provides a sintering furnace and a battery cell to improve the sintering efficiency of the battery cell.

[0005] To achieve the above object, the technical solution of the present invention is realized as follows:

[0006] In a first aspect, an embodiment of the present invention provides a sintering furnace, which includes a furnace body and a conveying mechanism.

[0007] The furnace body is provided with a furnace cavity, a first air inlet, and a second air inlet. The furnace cavity is respectively communicated with the first air inlet and the second air inlet, and the first air inlet and the second air inlet are respectively configured to introduce gas into the furnace cavity.

[0008] The conveying mechanism moves along a path passing through the furnace cavity. The conveying mechanism includes a first conveying area and a second conveying area, and the first conveying area and the second conveying area are spaced apart in a direction perpendicular to the conveying direction of the conveying mechanism. The first conveying area and the second conveying area are respectively used to carry battery cells, and the first air inlet is arranged on the furnace body wall corresponding to the first conveying area, and the second air inlet is arranged on the furnace body wall corresponding to the second conveying area.

[0009] In some embodiments, the sintering furnace further includes a first breathable heat-insulating layer disposed in the furnace cavity. The first breathable heat-insulating layer is provided with first breathable holes, and the first breathable heat-insulating layer and the upper cavity wall of the furnace cavity enclose a first chamber. Among them, the first air inlet is arranged on the furnace body wall above the first conveying area, and the second air inlet is arranged on the furnace body wall above the second conveying area.

[0010] In some embodiments, the sintering furnace further includes a second breathable heat-insulating layer disposed in the furnace cavity. The second breathable heat-insulating layer is provided with second breathable holes. The second breathable heat-insulating layer and the lower cavity wall of the furnace cavity enclose a second chamber. The lower cavity wall of the furnace cavity is further provided with a third air inlet and a fourth air inlet. The third air inlet and the fourth air inlet are respectively communicated with the second chamber. The third air inlet is disposed corresponding to the lower part of the first conveying area; the fourth air inlet is disposed corresponding to the lower part of the second conveying area. Wherein, the conveying mechanism is disposed between the first breathable heat-insulating layer and the second breathable heat-insulating layer.

[0011] In some embodiments, the sintering furnace further includes a plurality of heating tubes. The plurality of heating tubes are respectively disposed in the first chamber and / or the second chamber. The heating tube includes a tube body and a heating wire disposed in the tube body. In a direction perpendicular to the conveying direction of the conveying mechanism, both the tube body and the heating wire extend to the side wall of the furnace cavity.

[0012] In some embodiments, the density of the heating wire per unit length near the end of the tube body is greater than the density of the heating wire per unit length located in the middle of the tube body.

[0013] In some embodiments, the first conveying area includes at least two first conveying sub-areas arranged in sequence along the path direction passing through the furnace cavity. The second conveying area includes at least two second conveying sub-areas arranged in sequence along the path direction passing through the furnace cavity. The first air inlet is disposed on the furnace body wall above the first conveying sub-area ranked first among the at least two first conveying sub-areas; the second air inlet is disposed on the furnace body wall above the second conveying sub-area ranked last among the at least two second conveying sub-areas; and / or, the third air inlet is disposed on the furnace body wall below the first conveying sub-area ranked first among the at least two first conveying sub-areas; the fourth air inlet is disposed on the furnace body wall below the second conveying sub-area ranked last among the at least two second conveying sub-areas.

[0014] In some embodiments, the sintering furnace includes a first air inlet pipe. One end of the first air inlet pipe is communicated with the first air inlet, and the other end is communicated with the second air inlet. The middle part of the first air inlet pipe is configured to input gas; and / or, the sintering furnace includes a second air inlet pipe. One end of the second air inlet pipe is communicated with the third air inlet, and the other end is communicated with the fourth air inlet. The middle part of the second air inlet pipe is configured to input gas.

[0015] In some embodiments, the distance between the first conveying area and the second conveying area in a direction perpendicular to the path passing through the furnace cavity is 5 mm - 80 mm; and / or, the distance between the first conveying area and / or the second conveying area and the side wall of the furnace body in a direction perpendicular to the path passing through the furnace cavity is 10 mm - 80 mm.

[0016] In some embodiments, the distance between the first conveying area and the second conveying area in a direction perpendicular to the path passing through the furnace cavity is 30 mm - 50 mm; and / or, the distance between the first conveying area and / or the second conveying area and the side wall of the furnace body in a direction perpendicular to the path passing through the furnace cavity is 35 mm - 55 mm.

[0017] In some embodiments, the ratio of the distance between the first conveying area and the second conveying area in a direction perpendicular to the path passing through the furnace cavity to the distance between the first conveying area and / or the second conveying area and the side wall of the furnace body in a direction perpendicular to the path passing through the furnace cavity is 0.7 - 1.3.

[0018] In some embodiments, the furnace body is further provided with a third air inlet, the furnace cavity is communicated with the third air inlet, and the third air inlet is configured to introduce gas into the furnace cavity; the conveying mechanism further includes a third conveying area, and the third conveying area is spaced from the first conveying area and the second conveying area in a direction perpendicular to the conveying direction of the conveying mechanism. The third conveying area is used for carrying the battery wafers, and the third air inlet is arranged on the furnace body wall corresponding to the third conveying area.

[0019] In a second aspect, an embodiment of the present invention further provides a battery wafer, which is sintered in the above-mentioned sintering furnace. The battery wafer includes grid lines, and the ratio range of the height to the width of the grid lines is 15% - 25%.

[0020] In some embodiments, the height range of the grid lines is 6 μm - 9 μm; the width range of the grid lines is 20 μm - 25 μm.

[0021] In a third aspect, an embodiment of the present invention further provides a battery wafer, which is sintered in the above-mentioned sintering furnace. The passivation layers on the four side surfaces of the battery wafer are the same; and / or the ratio range of the lengths of the two side edges of the battery wafer is (3 / 22, 11 / 18).

[0022] The present invention discloses a sintering furnace. A first air inlet is arranged on the furnace body wall corresponding to a first conveying area to introduce gas to the battery wafers on the first conveying area; a second air inlet is arranged on the furnace body wall corresponding to a second conveying area to introduce gas to the battery wafers on the second conveying area. By introducing gas through the first air inlet and the second air inlet respectively, the air flow direction in the furnace cavity can be effectively controlled by adjusting the size of the gas, the temperature difference in the furnace cavity in the direction perpendicular to the conveying direction of the conveying mechanism can be improved, so that the battery wafers are heated evenly, the situation of poor sintering of the battery wafers is avoided, and the efficiency of the battery wafers can be effectively improved.

[0023] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following specifically gives the specific embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments.

[0025] Figure 1 It is a partial structural schematic diagram of the three-dimensional view of the sintering furnace described in the embodiment of the present application;

[0026] Figure 2 It is a structural schematic diagram of the upper partial cross-sectional view of the sintering furnace described in the embodiment of the present application;

[0027] Figure 3 It is a structural schematic diagram of the heating tube described in the embodiment of the present application;

[0028] Figure 4 It is a partial structural schematic diagram of the conveying mechanism described in the embodiment of the present application;

[0029] Figure 5 It is a state schematic diagram when the battery wafers are sintered described in the embodiment of the present application.

[0030] DESCRIPTION OF THE REFERENCE NUMERALS:

[0031] 1. Furnace body; 11. Furnace cavity; 111. Upper cavity wall; 112. Lower cavity wall; 113. First chamber; 114. Second chamber; 115. Middle chamber; 12. First air inlet; 13. Second air inlet; 14. First air inlet pipe; 15. First breathable heat-insulating layer; 16. Second breathable heat-insulating layer; 171. First breathable hole; 172. Second breathable hole; 18. Third air inlet; 19. Fourth air inlet; 20. Second air inlet pipe;

[0032] 2. Conveying mechanism; 21. First conveying area; 22. Second conveying area; 23. Limiting member;

[0033] 3. Heating tube; 31. Tube body; 32. Heating wire;

[0034] 4. Solar cell. Detailed implementation manners

[0035] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be completely conveyed to those skilled in the art.

[0036] In the current technology, in order to improve the power of the solar cell at the module end, the whole solar cell is cut into half solar cells by laser cutting at the module end and then encapsulated to improve the power at the module end from the encapsulation technology. However, during the cutting process of the whole solar cell, the solar cell will be damaged, and there will be partial efficiency loss of the solar cell, which ultimately leads to partial power loss at the module end and also increases the fragmentation rate of the solar cell.

[0037] Therefore, usually improvements are made from the cell end, that is, directly producing half solar cells to solve the problems brought by the cutting process of the whole solar cell. However, the inventor found that in the sintering process, when single half solar cells enter the sintering furnace in sequence, the efficiency of the solar cell 4 will be relatively low.

[0038] Referring to Figures 1 to 5 As shown, an embodiment of the present application provides a sintering furnace and a solar cell 4 sintered in the sintering furnace, which can solve the problem of low efficiency of the solar cell 4 during the sintering process.

[0039] The sintering furnace and the solar cell provided by the embodiment of the present application will be described in detail below with reference to the accompanying drawings through specific embodiments and their application scenarios.

[0040] In some embodiments, the present application provides a sintering furnace, which includes a furnace body 1 and a conveying mechanism 2; the furnace body 1 is provided with a furnace cavity 11, a first air inlet 12 and a second air inlet 13, the furnace cavity 11 is respectively communicated with the first air inlet 12 and the second air inlet 13, and the first air inlet 12 and the second air inlet 13 are respectively configured to introduce gas into the furnace cavity 11; the conveying mechanism 2 moves along a path passing through the furnace cavity 11, the conveying mechanism 2 is provided with a first conveying area 21 and a second conveying area 22, the first conveying area 21 and the second conveying area 22 are spaced apart in a direction perpendicular to the conveying direction of the conveying mechanism 2, and the first conveying area 21 and the second conveying area 22 are respectively used for carrying the battery wafers 4; the first air inlet 12 is arranged on the furnace body wall corresponding to the first conveying area 21, and the second air inlet 13 is arranged on the furnace body wall corresponding to the second conveying area 22. That is to say, by respectively arranging air inlets on the furnace body walls corresponding to the two battery wafers, the heat uniformity of the two battery wafers is realized, thereby improving the sintering efficiency of the battery wafers.

[0041] It can be understood that the first air inlet and the second air inlet can be respectively arranged on the furnace body wall above the battery wafer 4, or can be respectively arranged on the furnace body wall below the battery wafer 4, and the present application does not limit this. For the convenience of description, the following takes the example that the first air inlet and the second air inlet can be respectively arranged on the furnace body wall above the battery wafer 4 for illustration.

[0042] It can also be understood that in the embodiments of the present application, an air outlet can also be arranged below the furnace body wall, that is, the first air inlet 12 and the second air inlet 13 introduce gas into the furnace cavity 11 and output from the air outlet below.

[0043] In a possible implementation manner, the battery wafer 4 carried on the first conveying area and the battery wafer 4 carried on the second conveying area can be two segments of the same whole piece, or two whole pieces, or other segments, and the present application does not limit this.

[0044] In one embodiment, the conveying mechanism may further include a plurality of conveying areas, and correspondingly, a plurality of corresponding air inlets are also arranged on the furnace body 1. For example, the furnace body 1 is further provided with a third air inlet, the furnace cavity 11 is communicated with the third air inlet, and the third air inlet is configured to introduce gas into the furnace cavity 11; the conveying mechanism 2 further includes a third conveying area, and the third conveying area is spaced apart from the first conveying area 21 and the second conveying area 22 in a direction perpendicular to the conveying direction of the conveying mechanism 2, the third conveying area is used for carrying the battery wafer 4, and the third air inlet is arranged on the furnace body wall corresponding to the third conveying area.

[0045] It can be understood that the third conveying area can be arranged on one side of the first conveying area 21, or can be arranged on one side of the second conveying area 22, and the present application does not limit this.

[0046] In one embodiment, the first conveying area 21 and the second conveying area 22 respectively correspond to a conveying component. The two conveying components can convey simultaneously or non-simultaneously, and the present application does not limit this.

[0047] In another embodiment, the first conveying area 21 and the second conveying area 22 can be different areas in the same conveying component. For the convenience of description, in the following embodiments, it is taken as an example that the first conveying area 21 and the second conveying area 22 are different areas in the same conveying component for illustration.

[0048] In the embodiments of the present application, the sintering furnace has a pre-sintering area, a sintering area, and a cooling area. There is a temperature gradient between the three areas. In the pre-sintering area, organic substances and volatile substances are removed and preparations for sintering are made. The sintering area can be understood as a high-temperature area, which is used to form an ohmic contact, thereby improving the open-circuit voltage and fill factor of the solar cell. In the cooling area, the grid line structure is solidified by controlling the cooling rate. Among them, in the sintering process, uneven sintering and poor sintering mainly occur in the sintering area. Therefore, the sintering furnaces in the embodiments of the present application are all located in the sintering area.

[0049] In a possible implementation manner, the conveying mechanism 2 penetrates the furnace cavity 11 along the length direction of the furnace body 1. The first conveying area 21 and the second conveying area 22 on the conveying mechanism 2 are respectively used to carry the battery wafers 4, so that the two battery wafers 4 enter the furnace cavity 11 together. The first conveying area 21 and the second conveying area 22 are spaced apart in a direction perpendicular to the conveying direction of the conveying mechanism 2, so that the two battery wafers 4 are spaced apart in a direction perpendicular to the conveying direction of the conveying mechanism 2, and there is a preset first preset distance between the two battery wafers 4; there is a preset second preset distance between a single battery wafer 4 and the side wall of the furnace cavity 11 in a direction perpendicular to the conveying direction.

[0050] Among them, taking the case where the sintering furnace only includes the first conveying area 21 and the second conveying area 22 as an example, the first preset distance + 2 times the second preset distance + 2 times the width of the battery wafer 4 = the distance between the inner walls of the sintering furnace. The width of the battery wafer 4 is the dimension in a direction perpendicular to the conveying direction of the conveying mechanism 2, and the distance between the inner walls of the sintering furnace is the dimension in a direction perpendicular to the conveying direction of the conveying mechanism 2.

[0051] It can be understood that in the embodiments of the present application, the distances between different battery wafers 4 and the inner walls of the sintering furnace can be the same or different, and the present application does not limit this. For the convenience of description, in the following embodiments, it is taken as an example that the distances between different battery wafers 4 and the inner walls of the sintering furnace are the same for illustration.

[0052] In a possible implementation, the ratio of the first preset distance to the second preset distance is 0.7 to 1.3. The first preset distance and the second preset distance are similar, that is, the placement positions of the two solar cells 4 in the sintering furnace are uniform, which can help improve the uniformity of heat received by the two solar cells 4.

[0053] Optionally, the range of the first preset distance is, for example, 30 mm - 50 mm. The range of the second preset distance is, for example, 35 mm - 55 mm.

[0054] For example, the distance between the two solar cells 4 is 40 mm, and the distance between a single solar cell 4 and the side wall of the furnace chamber 11 in the direction perpendicular to the conveying direction is 45 mm. If the distance between the two solar cells 4 is too close, problems such as poor sintering are likely to occur. If the distance between the two solar cells 4 is too far, the solar cell 4 is closer to the side wall of the furnace chamber 11, increasing the difficulty of controlling the uniformity of heat received by the solar cell 4. Therefore, the distance between the two solar cells 4 needs to be set moderately.

[0055] In the sintering furnace according to the embodiment of the present application, the first air inlet 12 is provided on the furnace body wall corresponding to the first conveying area 21 to introduce gas into the solar cell 4 on the first conveying area 21; the second air inlet 13 is provided on the furnace body wall corresponding to the second conveying area 22 to introduce gas into the solar cell 4 on the second conveying area 22. By introducing gas through the first air inlet 12 and the second air inlet 13 respectively, the direction of the air flow in the furnace chamber 11 can be effectively controlled by adjusting the size of the gas, improving the temperature difference in the furnace chamber 11 in the direction perpendicular to the conveying direction of the conveying mechanism 2, enabling the two solar cells 4 to be heated evenly respectively, avoiding poor sintering of the solar cell 4, and effectively improving the efficiency of the solar cell 4.

[0056] In some embodiments, the first air inlet 12 and the second air inlet 13 are arranged at intervals in the conveying direction of the conveying mechanism 2. In this way, the distance between the first air inlet 12 and the second air inlet 13 is relatively moderate, which can reduce the influence of ventilation between the first air inlet 12 and the second air inlet 13, so as to better control the direction of the air flow in the furnace chamber 11, improve the temperature difference in the furnace chamber 11 in the direction perpendicular to the conveying direction of the conveying mechanism 2, and improve the sintering yield.

[0057] In some embodiments, the first air inlet 12 is provided on the furnace body wall above the first conveying area 21, and the second air inlet 13 is provided on the furnace body wall above the second conveying area 22. In this way, the first air inlet 12 introduces gas above the solar cell 4 on the first conveying area 21, and the second air inlet 13 introduces gas above the solar cell 4 on the second conveying area 22.

[0058] In some embodiments, a third air inlet 18 and a fourth air inlet 19 are further provided on the lower cavity wall 112 of the furnace cavity 11. The third air inlet 18 and the fourth air inlet 19 are respectively communicated with the furnace cavity 11. The third air inlet 18 is arranged corresponding to the lower part of the first conveying area 21 to introduce gas below the solar cell 4 on the first conveying area 21; the fourth air inlet 19 is arranged corresponding to the lower part of the second conveying area 22 to introduce gas below the solar cell 4 on the second conveying area 22.

[0059] In the embodiments of the present application, through the settings of the first air inlet 12, the second air inlet 13, the third air inlet 18, and the fourth air inlet 19, the solar cell 4 is heated more uniformly.

[0060] It can be understood that the settings of the third air inlet 18 and the fourth air inlet 19 can refer to the setting structures of the first air inlet 12 and the second air inlet 13 and have the beneficial effects of the first air inlet 12 and the second air inlet 13. Therefore, the settings of the third air inlet 18 and the fourth air inlet 19 will not be elaborated too much.

[0061] It should be noted that if the conveying mechanism further includes multiple conveying areas, the lower cavity wall 112 of the furnace cavity 11 corresponding to the multiple conveying areas of the conveying mechanism is also provided with corresponding air inlets.

[0062] In some embodiments, as Figure 4 shown, the first conveying area 21 includes at least two first conveying sub-areas arranged in sequence along the path direction penetrating the furnace cavity 11, and the second conveying area 22 includes at least two second conveying sub-areas arranged in sequence along the path direction penetrating the furnace cavity 11. That is, on one side of the conveying mechanism 2 perpendicular to the conveying direction of the conveying mechanism 2, at least two first conveying sub-areas are provided, and adjacent two first conveying sub-areas are spaced apart; on the opposite side, at least two second conveying sub-areas are provided, and adjacent two second conveying sub-areas are spaced apart. The settings of the at least two first conveying sub-areas and the at least two second conveying sub-areas can simultaneously convey multiple solar cells 4 into the furnace cavity 11 to improve the sintering efficiency.

[0063] It can be understood that the first conveying area 21 and the second conveying area 22 correspond to each other. For example, the first conveying area 21 and the second conveying area 22 are arranged in alignment along the direction perpendicular to the conveying direction of the conveying mechanism 2.

[0064] Correspondingly, the first conveying sub-area and the second conveying sub-area correspond to each other. For example, the first conveying sub-area and the second conveying sub-area are respectively arranged in alignment along the direction perpendicular to the conveying direction of the conveying mechanism 2.

[0065] In some embodiments, as Figure 4As shown in the figure, a plurality of limiting members 23 such as thimbles are provided on the conveying mechanism 2. The plurality of limiting members 23 such as thimbles are arranged along the conveying direction and perpendicular to the conveying direction. The limiting members 23 such as thimbles respectively enclose a first conveying sub-region and a second conveying sub-region. The limiting members 23 such as thimbles are used to hold the battery sheet 4 to realize the limitation of the battery sheet 4.

[0066] In some embodiments, the first air inlet 12 is arranged facing the middle of the first conveying area 21 to output gas facing the middle of the battery sheet 4 on the first conveying area 21; the second air inlet 13 is arranged facing the middle of the second conveying area 22 to output gas facing the middle of the battery sheet 4 on the second conveying area 22. In the above structure of the embodiment of the present application, the first air inlet 12 and the second air inlet 13 respectively introduce gas into the middle of the battery sheet 4. On the basis of improving the temperature difference in the furnace cavity 11 in the direction perpendicular to the conveying direction of the conveying mechanism 2, the temperature difference between the battery sheet 4 on the first conveying area 21 and the temperature of the battery sheet 4 on the second conveying area 22 is reduced, so that the sintering is uniform and the efficiency and yield of the battery sheet 4 are improved.

[0067] In some embodiments, the first air inlet 12 is arranged on the furnace body wall above the first conveying sub-region ranked first among at least two first conveying sub-regions, and the second air inlet 13 is arranged on the furnace body wall above the second conveying sub-region ranked last among at least two second conveying sub-regions.

[0068] In some embodiments, the third air inlet is arranged on the furnace body wall below the first conveying sub-region ranked first among at least two first conveying sub-regions, and the fourth air inlet 19 is arranged on the furnace body wall below the second conveying sub-region ranked last among at least two second conveying sub-regions.

[0069] In the above setting method of the embodiment of the present application, the first air inlet 12 and the second air inlet 13 are arranged diagonally, and the third air inlet and the fourth air inlet 19 are also arranged diagonally. This setting method can, on the one hand, avoid interference between the gas entering the furnace cavity 11 through the first air inlet 12 and the gas entering the furnace cavity 11 through the second air inlet 13, and interference between the gas entering the furnace cavity 11 through the third air inlet and the gas entering the furnace cavity 11 through the fourth air inlet 19, and can also make all the battery sheets 4 heat evenly, thereby achieving the purpose of uniform sintering.

[0070] In some embodiments, a plurality of first conveying sub-regions and a plurality of second conveying sub-regions are provided on the sintering furnace, and a plurality of first air inlets 12, a plurality of second air inlets 13, a plurality of third air inlets, and a plurality of fourth air inlets 19 are provided. Among them, every two first conveying sub-regions and two adjacent second conveying sub-regions in the direction perpendicular to the conveying direction form a group corresponding to one first air inlet 12, one second air inlet 13, one third air inlet, and one fourth air inlet 19. There are a plurality of the above corresponding setting relationships in the sintering furnace, or other setting methods at other positions. Or every three first conveying sub-regions and three adjacent second conveying sub-regions in the direction perpendicular to the conveying direction form a group; it can also be that a plurality of first conveying sub-regions and a plurality of adjacent second conveying sub-regions in the direction perpendicular to the conveying direction form a group, and the present application does not limit this.

[0071] In some embodiments, among two adjacent first conveying sub-regions in the conveying direction of the conveying mechanism 2, and two second conveying sub-regions adjacent to the two first conveying sub-regions in the direction perpendicular to the conveying direction of the conveying mechanism 2, the middle parts of each first conveying sub-region and each second conveying sub-region form the four vertices of a rectangle; when the first air inlet 12 corresponds to one vertex, the second air inlet 13 corresponds to another vertex that is diagonally arranged with this vertex, and when the third air inlet corresponds to one vertex, the fourth air inlet 19 corresponds to another vertex that is diagonally arranged with this vertex. In this way, the first air inlet 12 and the second air inlet 13 are diagonally arranged, and the third air inlet and the fourth air inlet 19 are diagonally arranged.

[0072] In some embodiments, the sintering furnace includes multiple groups of air inlets, and the multiple groups of air inlets are spaced in the conveying direction of the conveying mechanism 2. Each group of air inlets includes a first air inlet 12, a second air inlet 13, a third air inlet, and a fourth air inlet 19. In the above structure of the embodiments of the present application, the setting of multiple groups of air inlets realizes ventilation at multiple positions to meet the temperature requirements in the furnace cavity 11, thereby improving the efficiency and yield of the battery sheet 4.

[0073] It can be understood that in the conveying direction of the conveying mechanism 2, the distance between two adjacent groups of air inlets is set according to the use requirements, as long as the temperature requirements in the furnace cavity 11 in the sintering process are met.

[0074] In some embodiments, the sintering furnace includes a first air inlet pipe 14. One end of the first air inlet pipe 14 is communicated with the first air inlet 12, and the other end is communicated with the second air inlet 13. The middle part of the first air inlet pipe 14 is configured to input gas.

[0075] In the embodiments of the present application, during actual use of the sintering furnace, the third air inlet pipe can be used to communicate with the middle part of the first air inlet pipe 14, and gas is introduced into the first air inlet pipe 14 through the third air inlet pipe. The gas in the first air inlet pipe 14 is respectively introduced into the furnace chamber 11 through the first air inlet 12 and the second air inlet 13.

[0076] In some embodiments, the sintering furnace further includes a second air inlet pipe 20. One end of the second air inlet pipe 20 is communicated with the third air inlet, and the other end is communicated with the fourth air inlet 19. The middle part of the second air inlet pipe 20 is configured to input gas.

[0077] In the embodiments of the present application, during actual use of the sintering furnace, the fourth air inlet pipe can be used to communicate with the middle part of the second air inlet pipe 20, and gas is introduced into the second air inlet pipe 20 through the fourth air inlet pipe. The gas in the second air inlet pipe 20 is respectively introduced into the furnace chamber 11 through the third air inlet and the fourth air inlet 19.

[0078] In some embodiments, the sintering furnace further includes a first breathable heat-insulating layer 15 and a second breathable heat-insulating layer 16 disposed in the furnace chamber 11. The first breathable heat-insulating layer 15 is provided with first breathable holes 171, and the second breathable heat-insulating layer 16 is provided with second breathable holes 172. The first breathable heat-insulating layer 15 and the upper chamber wall 111 of the furnace chamber 11 enclose a first chamber 113. The first air inlet 12 and the second air inlet 13 provided on the upper chamber wall 111 of the furnace chamber 11 are respectively communicated with the first chamber 113. The second breathable heat-insulating layer 16 and the lower chamber wall 112 of the furnace chamber 11 enclose a second chamber 114. The lower chamber wall 112 of the furnace chamber 11 is further provided with a third air inlet 18 and a fourth air inlet 19. The third air inlet 18 and the fourth air inlet 19 are respectively communicated with the second chamber 114. The third air inlet 18 is disposed corresponding to the lower part of the first conveying area 21. The fourth air inlet 19 is disposed corresponding to the lower part of the second conveying area 22. The conveying mechanism 2 is disposed between the first breathable heat-insulating layer 15 and the second breathable heat-insulating layer 16.

[0079] In the embodiments of the present application, the furnace chamber 11 between the first breathable heat-insulating layer 15 and the second breathable heat-insulating layer 16 is a middle chamber 115, and the conveying mechanism 2 penetrates through the middle chamber 115 to be disposed between the first breathable heat-insulating layer 15 and the second breathable heat-insulating layer 16.

[0080] The first breathable heat-insulating layer 15 and the second breathable heat-insulating layer 16 are configured to make the gas flow evenly, which can effectively improve the air flow uniformity in the middle chamber 115 between the first breathable heat-insulating layer 15 and the second breathable heat-insulating layer 16, so that the battery wafers 4 on the conveying mechanism 2 are heated more evenly, especially the temperature difference within a single battery wafer 4, avoiding poor sintering caused by uneven sintering, and effectively improving the efficiency and yield of the battery wafers 4.

[0081] Moreover, the first breathable heat-insulating layer 15 and the second breathable heat-insulating layer 16 also have a preheating function, that is, the gas in the first chamber 113 can be preheated when passing through the first air-permeable holes 171 on the first breathable heat-insulating layer 15, and the gas in the second chamber 114 can be preheated when passing through the second air-permeable holes 172. The preheated hot air then enters the middle chamber 115.

[0082] In some embodiments, the upper chamber wall 111 of the furnace chamber 11 is provided with a plurality of first air inlets 12 and second air inlets 13, and the lower chamber wall 112 of the furnace chamber 11 is provided with a plurality of third air inlets 18 and fourth air inlets 19. In the projection on the conveying mechanism 2, the air inlets on the upper chamber wall 111 and the air inlets on the lower chamber wall 112 are arranged at intervals in the conveying direction of the conveying mechanism 2 to achieve uniform air intake and make the temperature in the furnace chamber 11 more uniform.

[0083] In some embodiments, the sintering furnace further includes a plurality of heating tubes 3, and the plurality of heating tubes 3 are respectively arranged in the first chamber 113 and / or the second chamber 114, and the heating tubes 3 extend in a direction perpendicular to the conveying direction of the conveying mechanism 2.

[0084] In the embodiment of the present application, the setting of the heating tubes 3 is used to heat the gas in the first chamber 113 and to heat the gas in the second chamber 114, so that the gas introduced into the middle chamber 115 meets the sintering temperature requirements.

[0085] In some embodiments, the heating tube 3 includes a tube body 31 and a heating wire 32 arranged in the tube body 31; in a direction perpendicular to the conveying direction of the conveying mechanism 2, both the tube body 31 and the heating wire 32 extend to the side wall of the furnace chamber 11.

[0086] As Figure 2 shown, in the above structure of the embodiment of the present application, the heating tube 3 can heat the furnace chamber 11 within a range in the extending direction perpendicular to the conveying mechanism 2, so that the temperature in the furnace chamber 11 is more uniform, and thus the sintering is more uniform, improving the efficiency and yield of the battery sheet 4.

[0087] In the embodiment of the present application, the first breathable heat-insulating layer 15 and the second breathable heat-insulating layer 16 effectively improve the air flow uniformity in the middle chamber 115. The heating tube 3 has a relatively wide effective heating area for the furnace chamber 11, which can make the temperature in the furnace chamber 11 uniform. Through the first breathable heat-insulating layer 15, the second breathable heat-insulating layer 16 and the heating tube 3, the internal temperature distribution in the middle chamber 115 is uniform, enabling the battery sheet 4 to be uniformly heated, thereby improving the efficiency and yield.

[0088] In some embodiments, in a direction perpendicular to the conveying direction of the conveying mechanism 2, the density of the heating wire 32 per unit length near the end of the tube body 31 is greater than the density of the heating wire 32 per unit length located in the middle of the tube body 31.

[0089] The density of the heating wire 32 within the unit length of the tube body 31 is different, and the calorific value of the heating wire 32 is different. In the embodiment of the present application, the calorific value of the heating wire 32 at the end of the tube body 31 is greater than that of the heating wire 32 in the middle of the tube body 31, which can reduce the situation of low temperature at the edge of the furnace cavity 11, ensure that the part of the battery sheet 4 near the edge of the furnace cavity 11 is heated the same as the middle position, avoid the situation of uneven sintering and poor sintering caused by different edge temperatures and middle temperatures, and improve the efficiency and yield of the battery sheet 4.

[0090] In some embodiments, in the direction perpendicular to the conveying direction of the conveying mechanism 2, the density of the heating wire 32 per unit length located in the middle of the tube body 31 is the same. In this way, it is ensured that the part of the battery sheet 4 near the middle of the furnace cavity 11 is heated evenly, avoiding the situation of poor sintering caused by uneven temperature, and improving the efficiency and yield of the battery sheet 4.

[0091] In a specific embodiment, in the current technology, when the entire battery sheet enters the furnace cavity 11 of the sintering furnace, the distance between the entire battery sheet and the cavity wall of the furnace cavity 11 is relatively large, for example, 60 mm. The influence of the cavity wall of the furnace cavity 11 on the overall temperature uniformity of the battery sheet is relatively low, and the gas introduced into the furnace cavity 11 is evenly distributed above and below the entire battery sheet, and the air flow wraps the entire battery sheet to heat the entire battery sheet evenly.

[0092] Adding the sizes of the two battery sheets 4 and the distance between the two battery sheets 4, the distance between the battery sheet 4 and the cavity wall of the furnace cavity 11 is relatively small, for example, 40 mm. The cavity wall of the furnace cavity 11 causes the edge temperature of the battery sheet 4 to be low, and the influence of the cavity wall of the furnace cavity 11 on the temperature uniformity of a single battery sheet 4 is relatively large. Moreover, the widths of the two battery sheets 4 are relatively large, and the air flow cannot be evenly distributed on the surface of the battery sheet 4. These result in a high middle temperature and a low edge temperature of the battery sheet 4 in the direction perpendicular to the conveying direction of the conveying mechanism 2, causing uneven heating of the battery sheet 4 and thus affecting the overall efficiency and yield of the battery sheet 4.

[0093] In the sintering furnace in the embodiment of the present application, the first air inlet 12 is arranged corresponding to the upper part of the first conveying area 21, and the third air inlet is arranged corresponding to the lower part of the first conveying area 21 to introduce gas into the battery sheet 4 on the first conveying area 21; the second air inlet 13 is arranged corresponding to the upper part of the second conveying area 22, and the fourth air inlet 19 is arranged corresponding to the lower part of the second conveying area 22 to introduce gas into the battery sheet 4 on the second conveying area 22. By introducing gas through the first air inlet 12, the second air inlet 13, the third air inlet and the fourth air inlet 19 respectively, the air flow direction in the furnace cavity 11 can be effectively controlled by adjusting the size of the gas. Moreover, the introduced gas can improve the temperature difference in the furnace cavity 11 in the direction perpendicular to the conveying direction of the conveying mechanism 2 and be evenly distributed on the surface of the battery sheet 4, avoiding the problem of poor sintering of the battery sheet 4 and improving the efficiency and yield of the battery sheet 4.

[0094] In addition, the improvement of the air flow uniformity by the first breathable heat preservation layer 15 and the second breathable heat preservation layer 16, and the reduction of the temperature difference by the heating tube 3 in the direction perpendicular to the conveying direction of the conveying mechanism 2 both increase the uniformity of the heat received by the battery chip 4, thereby improving the battery yield rate.

[0095] It can be understood that the sintering furnace is also provided with a temperature control instrument and other temperature detection devices to monitor and adjust the temperature in the furnace chamber 11 in real time, so as to avoid overheating or process fluctuations, etc.

[0096] In some embodiments, the present application provides a battery chip 4, which is sintered in the sintering furnace as described above.

[0097] In the above-mentioned sintering furnace, gases are introduced through the first air inlet 12, the second air inlet 13, the third air inlet and the fourth air inlet 19 respectively, which can effectively control the air flow direction in the furnace chamber 11 by adjusting the size of the gas. Moreover, the introduced gas can be evenly distributed on the surface of the battery chip 4 to improve the temperature difference in the furnace chamber 11 in the direction perpendicular to the conveying direction of the conveying mechanism 2; the improvement of the air flow uniformity by the first breathable heat preservation layer 15 and the second breathable heat preservation layer 16; and the reduction of the temperature difference by the heating tube 3 in the direction perpendicular to the conveying direction of the conveying mechanism 2, so that when the battery chip 4 is sintered in the sintering furnace, it is evenly heated, thereby improving the efficiency and yield rate of the battery chip 4.

[0098] In some embodiments, the battery chip 4 includes grid lines, and the ratio range of the height to the width of the grid lines is 15% - 25%.

[0099] In the embodiments of the present application, when the battery chip 4 is sintered in the sintering furnace as described above, the battery chip 4 is evenly heated. The grid lines in the part of the battery chip 4 near the edge of the furnace chamber 11 in the direction perpendicular to the conveying direction of the conveying mechanism 2 can also be quickly formed and will not collapse downward. The grid lines in this edge part can be formed simultaneously with the grid lines in the middle part. In this way, the ratio of the height to the width of the grid lines of the battery chip 4 is relatively consistent, and the ratio of the height to the width is relatively large, the grid lines are relatively thin and tall, and the light shielding area becomes smaller, thereby improving the efficiency of the battery chip 4. It can be understood that the present application does not specifically limit the ratio of the height to the width of the grid lines. For example, the ratio of the height to the width is 15%, 16%, 17%, %, 19%, 20%, 21%, 22%, 23%, 24%, 25%.

[0100] In some embodiments, the height range of the grid lines is 6um - 9um. It can be understood that the present application does not specifically limit the height of the grid lines, which is set according to actual use requirements. For example, the height of the grid lines is one of 6um, 6.5um, 7um, 7.5um, 8um, 8.5um, 9um.

[0101] In some embodiments, the width range of the gate line is 20um - 25um. It can be understood that the present application does not specifically limit the width of the gate line, which is set according to actual usage requirements. For example, the width of the gate line is one of 20um, 20.5um, 21um, 21.5um, 22um, 22.5um, 23um, 23.5um, 24um, 24.5um, 25um.

[0102] Example 1:

[0103] The half-cell is sintered in the sintering furnace as described above. The size of the half-cell is 105 * 192.3. In the direction perpendicular to the conveying direction of the conveying mechanism 2, there is a spacing of 40mm between two half-cells, and the distance of the half-cell from the wall of the furnace chamber 11 is 40mm.

[0104] Comparative example:

[0105] The whole-cell is sintered in the sintering furnace of the current technology. The size of the whole-cell is 2mm * 192.3mm. In the direction perpendicular to the conveying direction of the conveying mechanism 2, the distance of the whole-cell from the wall of the furnace chamber 11 is 60mm.

[0106] Measure the height and width of the gate lines on the half-cell in Example 1, and measure the height and width of the gate lines on the whole-cell in the comparative example to obtain Table 1.

[0107] Table 1

[0108]

[0109] In Table 1, the height of the gate lines of the half-cell sintered in the sintering furnace as described above is increased by 47.72% compared with the height of the gate lines of the whole-cell sintered in the sintering furnace of the current technology, the width is narrowed by 11.42%, and the aspect ratio is increased by 66.68%. Therefore, sintering in the sintering furnace of the embodiments of the present application can effectively improve the aspect ratio of the gate lines, thereby improving the efficiency of the half-cell.

[0110] In some embodiments, the passivation layers on the four peripheral sides of the cell 4 sintered in the aforementioned sintering furnace are the same.

[0111] Considering that there will be serious damage (such as efficiency loss, increased fragmentation rate, etc.) after producing a whole-cell and then cutting it into half-cells. Therefore, currently, half-cells are directly produced at the cell end. That is to say, the passivation layers on the four peripheral sides of the cells obtained by the sintering furnace of the embodiments of the present application are the same.

[0112] In some other embodiments, the cell sheet 4 obtained by sintering in the aforementioned sintering furnace is a segmented cell sheet, where the long side of the segmented cell sheet corresponds to the conveying direction of the conveying mechanism 2. Herein, the segmentation can be 2 segments, 3 segments, 4 segments, 5 segments, 6 segments or multiple segments, and the present application does not limit this.

[0113] In some other embodiments, the ratio range of the lengths of the two side edges of the cell sheet 4 obtained by sintering in the aforementioned sintering furnace is (3 / 22, 11 / 18).

[0114] The overall length of the monolithic solar cell can be 180 mm, or 181 mm, or 182 mm, or 183 mm, or 184 mm, or 185 mm, or 186 mm, or 187 mm, or 188 mm, or 189 mm, or 190 mm, or 191 mm, or 192 mm, or 193 mm, or 194 mm, or 195 mm, or 196 mm, or 197 mm, or 198 mm, or 199 mm, or 200 mm, or 201 mm, or 202 mm, or 203 mm, or 204 mm, or 205 mm, or 206 mm, or 207 mm, or 208 mm, or 209 mm, or 210 mm, or 211 mm, or 212 mm, or 213 mm, or 214 mm, or 215 mm, or 216 mm, or 217 mm, or 218 mm, or 219 mm, or 220 mm, or any value between any two of the above.

[0115] The length a of the segmented solar cell sheet satisfies the following formula: 30 mm ≤ a ≤ 110 mm. For example, the length a of the segmented solar cell sheet can be 30 mm, or 32 mm, or 35 mm, or 38 mm, or 40 mm, or 42 mm, or 48 mm, or 50 mm, or 52 mm, or 53 mm, or 60 mm, or 64 mm, or 70 mm, or 71 mm, or 80 mm, or 90 mm, or 96 mm, or 100 mm, or 105 mm, or 106 mm, or 110 mm, or any value between any two of the above.

[0116] The width of the segmented solar cell can be between 180 mm and 220 mm. For example, the width of the segmented solar cell can be 180 mm, or 182 mm, or 184 mm, or 186 mm, or 188 mm, or 190 mm, or 192 mm, or 194 mm, or 196 mm, or 198 mm, or 200 mm, or 202 mm, or 204 mm, or 206 mm, or 208 mm, or 210 mm, or 212 mm, or 214 mm, or 216 mm, or 218 mm, or 220 mm, or any value between any two of the above.

[0117] It should be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0118] Each embodiment in this specification is described in a related manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. For the embodiments of the device, electronic device, computer-readable storage medium and computer program product containing instructions, since they are basically similar to the method embodiments, the description is relatively simple, and reference can be made to the partial description of the method embodiments for the relevant parts.

[0119] The above is only the preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention is included in the protection scope of the present invention.

Claims

1. A sintering furnace, characterized in that: include: A furnace body (1) is provided with a furnace cavity (11), a first air inlet (12) and a second air inlet (13), the furnace cavity (11) being communicated with the first air inlet (12) and the second air inlet (13) respectively, and the first air inlet (12) and the second air inlet (13) are respectively configured to introduce gas into the furnace cavity (11); A conveying mechanism (2) moves along a path running through the furnace cavity (11), the conveying mechanism (2) comprising a first conveying area (21) and a second conveying area (22), and the first conveying area (21) and the second conveying area (22) are arranged at intervals in a conveying direction perpendicular to the conveying mechanism (2), the first conveying area (21) and the second conveying area (22) are respectively used to carry battery cells (4), and the first air inlet (12) is arranged on a furnace wall corresponding to the first conveying area (21), and the second air inlet (13) is arranged on a furnace wall corresponding to the second conveying area (22).

2. The sintering furnace according to claim 1, characterized in that: The sintering furnace also includes a first air-permeable heat-insulating layer (15) arranged in the furnace cavity (11), the first air-permeable heat-insulating layer (15) is provided with a first air hole (171), the first air-permeable heat-insulating layer (15) and the upper cavity wall (111) of the furnace cavity (11) are arranged to form a first cavity (113), wherein the first air inlet (12) is arranged on the furnace wall above the first conveying area (21), and the second air inlet (13) is arranged on the furnace wall above the second conveying area (22).

3. The sintering furnace according to claim 2, characterized in that: The sintering furnace further comprises a second air-permeable heat-insulating layer (16) arranged in the furnace cavity (11), the second air-permeable heat-insulating layer (16) being provided with a second air-permeable hole (172), the second air-permeable heat-insulating layer (16) and the lower cavity wall (112) of the furnace cavity (11) forming a second cavity (114), and the lower cavity wall (112) of the furnace cavity (11) is further provided with a third air inlet (18) and a fourth air inlet (19), the third air inlet (18) and the fourth air inlet (19) being respectively connected to the second cavity (114), the third air inlet (18) being arranged corresponding to the lower part of the first conveying area (21), and the fourth air inlet (19) being arranged corresponding to the lower part of the second conveying area (22), wherein the conveying mechanism (2) is arranged between the first air-permeable heat-insulating layer (15) and the second air-permeable heat-insulating layer (16).

4. The sintering furnace according to claim 3, characterized in that: The sintering furnace further comprises a plurality of heating tubes (3), wherein the plurality of heating tubes (3) are respectively arranged in the first chamber (113) and / or the second chamber (114), wherein the heating tubes (3) comprise a tube body (31) and a heating wire (32) arranged in the tube body (31), and in a conveying direction perpendicular to the conveying mechanism (2), the tube body (31) and the heating wire (32) both extend to the side wall of the furnace chamber (11).

5. The sintering furnace according to claim 4, characterized in that: The density of the heating wire (32) per unit length near the end of the tube (31) is greater than the density of the heating wire (32) per unit length located in the middle of the tube (31).

6. The sintering furnace according to claim 3, characterized in that: The first conveying area (21) comprises at least two first conveying sub-areas arranged in sequence along the path direction passing through the furnace cavity (11), the second conveying area (22) comprises at least two second conveying sub-areas arranged in sequence along the path direction passing through the furnace cavity (11), the first air inlet (12) is arranged on the furnace body wall above the first conveying sub-area which is ranked first among the at least two first conveying sub-areas, and the second air inlet (13) is arranged on the furnace body wall above the second conveying sub-area which is ranked last among the at least two second conveying sub-areas; and / or The third air inlet (18) is arranged on the furnace wall below the first conveying sub-zone ranked first among the at least two first conveying sub-zones, and the fourth air inlet (19) is arranged on the furnace wall below the second conveying sub-zone ranked last among the at least two second conveying sub-zones.

7. The sintering furnace according to claim 3, characterized in that: The sintering furnace comprises a first air inlet pipe (14), one end of the first air inlet pipe (14) is connected to the first air inlet port (12), and the other end is connected to the second air inlet port (13), and the middle part of the first air inlet pipe (14) is configured to input gas; and / or The sintering furnace comprises a second air inlet pipe (20), one end of the second air inlet pipe (20) is connected to the third air inlet port (18), and the other end is connected to the fourth air inlet port (19), and the middle part of the second air inlet pipe (20) is configured to input gas.

8. The sintering furnace according to claim 1, characterized in that: The spacing distance between the first conveying area (21) and the second conveying area (22) in a direction perpendicular to the path running through the furnace chamber (11) is 5 mm to 80 mm, preferably 30 mm to 50 mm; and / or, The distance between the first conveying area (21) and / or the second conveying area (22) and the side wall of the furnace body (1) in a direction perpendicular to the path running through the furnace cavity (11) is 10 mm to 80 mm, preferably 35 mm to 55 mm; and / or The ratio of the spacing between the first conveying zone (21) and the second conveying zone (22) in a direction perpendicular to a path passing through the furnace cavity (11) to the distance between the first conveying zone (21) and / or the second conveying zone (22) and the side wall of the furnace body (1) in a direction perpendicular to the path passing through the furnace cavity (11) is 0.7 to 1.

3.

9. The sintering furnace according to any one of claims 1 to 8, characterized in that: The furnace body (1) is further provided with a third air inlet, the furnace cavity (11) is in communication with the third air inlet, and the third air inlet is configured to allow gas to flow into the furnace cavity (11); The conveying mechanism (2) further comprises a third conveying area, and the third conveying area is spaced apart from the first conveying area (21) and the second conveying area (22) in a conveying direction perpendicular to the conveying mechanism (2), the third conveying area is used to carry the battery cells (4), and the third air inlet is arranged on the furnace wall corresponding to the third conveying area.

10. A battery cell, characterized in that: The cell (4) is sintered in the sintering furnace as described in any one of claims 1 to 9, and the passivation layers on the four sides of the cell (4) are the same; and / or the ratio of the lengths of the two side edges of the cell (4) is in the range of (3 / 22, 11 / 18).

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