Drying device for back contact battery piece

Abstract

The utility model discloses a drying device for a back contact battery piece, which comprises a base provided with a transmission frame; the conveying mechanism comprises two conveying assemblies, in the two conveying assemblies, the conveying face output end of one conveying assembly is adjacent to the conveying face input end of the other conveying assembly, each conveying assembly comprises two conveying belts, the top face of each conveying assembly is in a long and thin strip shape, and the projections of the conveying belts of the two conveying assemblies on the horizontal plane are separated; the driving mechanism is used for driving the conveying belts to rotate at the same speed in the circumferential directions of the conveying belts; an upper heating assembly and a lower heating assembly. According to the drying device for the back contact battery piece, in the process that the two connected conveying assemblies drive the battery piece to be conveyed, the contact positions of the conveying belts in the conveying assemblies and the bottom face of the battery piece are changed, the situation that the battery piece is not prone to drying due to the fact that the battery piece is fixed by a supporting part is avoided, and the lower heating assembly conveniently and comprehensively heats and dries the bottom face of the battery piece; therefore, the drying effect is further improved, and the drying efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cell production, in particular to a drying device for back-contact battery cells. Background Art

[0002] In the production process of back-contact batteries, heating and drying treatment is one of the essential steps. It usually occurs after texturing cleaning, electrode printing and other steps that require the removal of solvents and volatiles. By performing drying or drying treatment, good contact between battery materials and the overall performance of the battery can be ensured.

[0003] For example, in the prior art, Chinese utility model patent No. CN214371572U discloses a drying device suitable for large-size battery cells. The device utilizes a first heating device and a second heating device to heat both sides of the battery cell, ensuring smooth drying while achieving comprehensive and efficient drying, avoiding wear on the battery cell, and ensuring drying quality and efficiency.

[0004] However, during operation, the drying device relies on the protrusions on the conveyor belt to support the solar cells, allowing a certain gap between the solar cells and the conveying surface of the conveyor belt. The through-holes facilitate the passage of heat generated by the second heating device to the bottom surface of the solar cells, heating and drying the bottom surface of the solar cells. Because the protrusions contact the bottom surface of the solar cells, the contact area between the solar cells and the protrusions is not fully heated, and moisture in and around the contact area is not easily volatilized. Furthermore, because the heat generated by the second heating device acts on the bottom surface of the solar cells through the through-holes, the number and size of the through-holes provided in the conveyor belt are limited. As a result, only a portion of the heat generated by the second heating device can pass through the through-holes and act on the bottom surface of the solar cells, resulting in low heating efficiency on the bottom surface of the solar cells. Therefore, to ensure the drying quality of the solar cells, the length of the device needs to be extended or the transmission efficiency of the solar cells needs to be reduced, resulting in low solar cell drying efficiency. Furthermore, the structural position of the conveyor belt, protrusions, and through-holes is fixed, resulting in the device being able to only transport and dry solar cells of a fixed size.

[0005] Based on the above situation, it is necessary to improve the battery cell drying device in the prior art. Utility Model Content

[0006] The purpose of the utility model is to overcome the defects in the prior art and provide a drying device that improves drying efficiency and drying effect and is applicable to back-contact battery cells of various specifications.

[0007] To achieve the above technical effects, the technical solution of the present invention is: a drying device for back contact solar cells, comprising:

[0008] A base, wherein a transmission frame is provided on the base;

[0009] A transmission mechanism, the transmission mechanism comprising two transmission components arranged horizontally on the transmission frame with the same transmission direction, wherein the transmission surface output end of one of the two transmission components is adjacent to the transmission surface input end of the other, and the two transmission components each comprise two transmission belts arranged side by side in the horizontal direction, the top surfaces of the two transmission belts being elongated strips arranged in the same horizontal plane to form the transmission surface of the corresponding transmission component, and the projections of the transmission belts of the two transmission components on the horizontal plane are spaced apart;

[0010] A driving mechanism, the driving mechanism is used to drive each conveyor belt to rotate at the same speed along its own circumferential direction;

[0011] An upper heating assembly and a lower heating assembly, wherein the upper heating assembly is used to heat the transmission surface of at least one of the transmission assemblies from above, and the lower heating assembly is used to heat the transmission surfaces of the two transmission assemblies from below.

[0012] Preferably, in order to simplify the structure and achieve a smooth transition of the battery cells on the transmission surfaces of the two transmission components, the output end of the transmission belt corresponding to one of the two transmission components is coaxial with the input end of the transmission belt corresponding to the other.

[0013] Preferably, in order to drive the transmission belts of the two transmission components to rotate at the same speed along their own circumference, the driving mechanism includes a driving motor and three transmission units distributed along the transmission direction of the two transmission components, and the three transmission units all include transmission wheels that rotate around their own axis lines on the inner sides of the two transmission belt ends respectively, and the axis lines of the transmission wheels extend along a distribution direction parallel to the two transmission belts in the transmission components. The driving motor is connected to the two transmission wheels of one of the transmission units, and the transmission wheels are connected through the transmission belts.

[0014] Preferably, in order to be suitable for carrying, transporting and drying battery cells of different sizes, the three transmission units each include two transmission wheels connected coaxially and corresponding one-to-one to the two transmission belts in each transmission component, and the three transmission units are connected with an adjustment mechanism, which is used to simultaneously adjust the distance between the two transmission wheels in each transmission unit to simultaneously adjust the spacing between the two transmission belts in the two transmission components.

[0015] Preferably, in order to achieve a stable transmission connection between the transmission wheel and the transmission belt, each transmission wheel is provided with an annular groove coaxial with itself, and the inner wall of the annular groove is sealed with the corresponding transmission belt.

[0016] Preferably, in order to facilitate adjustment of the axial position of the transmission wheel, in each transmission unit, a concentric shaft passes through the coaxial centerline between the two opposite transmission wheels, and matching convex keys and recesses are provided between the concentric shaft and the corresponding transmission wheel.

[0017] Preferably, in order to achieve distance adjustment between the two transmission belts in the transmission assembly, the adjustment mechanism includes a translation unit that is arranged opposite to each other and is respectively connected to the transmission wheels in each transmission unit, and the moving direction of the output end of the translation unit is consistent with the distribution direction of the two transmission belts in the transmission assembly.

[0018] Preferably, in order to reduce the diffusion of heat, it also includes an insulation channel fixed on the base, one adjacent end of the two transmission components is located in the insulation channel, and the other end is arranged outside the insulation channel, and the upper heating component and the lower heating component are both arranged in the insulation channel.

[0019] Preferably, in order to further reduce the diffusion of heat and achieve energy saving, baffles are provided at both ends of the heat insulation channel.

[0020] Preferably, in order to facilitate the timely discharge of moisture in the heat-insulating channel, the heat-insulating channel is connected to an air pump.

[0021] To sum up, compared with the prior art, the drying device for back-contact battery cells of the present invention uses two connected transmission components to drive the battery cells to be transmitted. By changing the contact position between the transmission belt in the transmission component and the bottom surface of the battery cells, the battery cells are prevented from being difficult to dry due to the fixation of the supporting parts, and the lower heating component is convenient for comprehensively heating and drying the bottom surface of the battery cells, thereby further improving the drying effect and increasing the drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the utility model;

[0023] Figure 2 yes Figure 1 Cross-sectional structural diagram;

[0024] Figure 3 yes Figure 2 Front view of

[0025] Figure 4 yes Figure 1 Explosion diagram of

[0026] Figure 5 yes Figure 1 Schematic diagram of part of the structure;

[0027] Figure 6 yes Figure 5 A top view of

[0028] Figure 7 yes Figure 5 Explosion diagram of

[0029] Figure 8 yes Figure 7 A magnified view of part A;

[0030] Figure 9 yes Figure 7 A magnified view of part B;

[0031] In the figure: 1. base; 11. transmission frame; 111. first bearing; 12. slide rod; 2. transmission belt; 21. rubber inner layer; 22. sponge outer layer; 3. upper heating assembly; 31. upper infrared lamp; 4. lower heating assembly; 41. lower infrared lamp; 5. drive motor; 6. transmission wheel; 61. annular groove; 62. depression; 7. concentric shaft; 71. cam; 72. bracket; 73. second bearing; 8. translation unit; 81. translation motor; 82. screw; 83. screw sleeve; 84. shaft sleeve; 85. translation frame; 86. slider; 87. roller; 9. thermal insulation channel; 91. baffle; 911. through hole; 92. vacuum pump; 10. battery cell. DETAILED DESCRIPTION

[0032] The following embodiments are used to further describe the specific embodiments of the present invention in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0033] like Figures 1-9 As shown, the drying device for back contact battery cells of the present invention comprises:

[0034] A base 1, on which a transmission frame 11 is provided;

[0035] The transmission mechanism includes two transmission components with the same transmission direction and arranged horizontally on the transmission frame 11. The transmission surface output end of one of the two transmission components is adjacent to the transmission surface input end of the other. The two transmission components each include two transmission belts 2 distributed side by side in the horizontal direction. The top surfaces of the two transmission belts 2 are slender strips arranged on the same horizontal plane to form the transmission surface of the corresponding transmission component. The projections of the transmission belts 2 of the two transmission components on the horizontal plane are separated.

[0036] A driving mechanism, which is used to drive each conveyor belt 2 to rotate at the same speed along its own circumferential direction;

[0037] The upper heating assembly 3 and the lower heating assembly 4, the upper heating assembly 3 is used to heat the transmission surface of at least one of the transmission assemblies from above, and the lower heating assembly 4 is used to heat the transmission surfaces of the two transmission assemblies from below.

[0038] In the device, two transmission components are connected in sequence, and both transmission components include two transmission belts 2. The transmission belt 2 is a closed loop, and its cross-sectional dimension is much smaller than its length dimension, so that the transmission belt 2 is a slender strip, reducing the contact area with the battery cell 10. The transmission component includes two transmission belts 2, and the battery cell 10 is carried by two rotating transmission belts 2 and a driving mechanism drives the transmission belt 2 to rotate at the same speed along its own circumference, so that the battery cell 10 moves in the horizontal direction. When the battery cell 10 passes through the upper heating component 3 and the lower heating component 4, the upper heating component 3 and the lower heating component 4 respectively heat the top and bottom surfaces of the battery cell 10 carried on the two transmission belts 2, thereby achieving drying of the battery cell 10.

[0039] Since the projections of the conveyor belts 2 in the two conveyor components are separated on the horizontal plane, when the battery cell 10 contacts the conveyor belts 2 of the two conveyor components, the contact parts of the battery cell 10 and the conveyor belts 2 are different, that is, the support position is changed, which makes it convenient for the lower heating component 4 to fully heat and dry the bottom surface of the battery cell 10, thereby avoiding the poor drying effect of the supported part and its vicinity caused by the fixed supported part of the battery cell 10 during the heating process. In this way, the heating and drying quality of the battery cell 10 is improved and the drying efficiency is improved.

[0040] A further improvement is that, in the two transmission components, the output end of the transmission belt 2 corresponding to one is coaxial with the input end of the transmission belt 2 corresponding to the other.

[0041] After adopting the above-mentioned improvement, the adjacent ends of the two transmission components are coaxial, which makes it convenient for the driving mechanism to drive the four transmission belts 2 to rotate. When the battery cell 10 is moved to the output end of the transmission belt 2 by one of the transmission components, the battery cell 10 is located at the input end of the transmission belt 2 of the other transmission component, and the latter's transmission belt 2 continues to drive the battery cell 10 to move, thereby realizing smooth transmission and movement of the battery cell 10.

[0042] In order to achieve smooth rotation of a total of four transmission belts 2 in the two transmission components, in the utility model, the driving mechanism includes a driving motor 5 and three transmission units distributed along the transmission direction of the two transmission components. The three transmission units all include transmission wheels 6 that rotate around their own axis lines on the inner sides of the ends of the two transmission belts 2 respectively. The axis lines of the transmission wheels 6 extend along a distribution direction parallel to the two transmission belts 2 in the transmission component. The driving motor 5 is driven and connected to the two transmission wheels 6 of one of the transmission units, and the transmission wheels 6 are connected through the transmission belts 2.

[0043] Since the adjacent ends of the two transmission components are coaxial, and the adjacent transmission units are located on the inner side of one of the transmission belts 2 and are connected through the transmission belt 2, the device only needs to use three transmission units. After the transmission wheel 6 in one of the transmission units is controlled by the driving motor 5 to rotate, the transmission wheels 6 of the other two transmission units can rotate synchronously, and the four transmission belts 2 can rotate at the same speed along their own circumference to drive the battery cell 10 to move, and pass between the upper heating component 3 and the lower heating component 4 to comprehensively heat the top and bottom surfaces of the battery cell 10.

[0044] A further improvement is that it also includes an insulating channel 9 fixed on the base 1, with one adjacent end of the two transmission components located in the insulating channel 9 and the other end arranged outside the insulating channel 9, and the upper heating component 3 and the lower heating component 4 are both arranged in the insulating channel 9.

[0045] Specifically, the heat-insulating channel 9 extends in a length direction parallel to the transmission component, and the cross-section of the heat-insulating channel 9 is an inverted U-shape. The two ends of the heat-insulating channel 9 are fixed above the base 1. By setting the heat-insulating channel 9, the diffusion of heat can be reduced, so that the upper heating component 3 and the lower heating component 4 can be concentrated in the heat-insulating channel 9 to heat the top and bottom surfaces of the battery cell 10 passing therebetween, thereby improving the drying efficiency.

[0046] The upper heating assembly 3 includes upper infrared lamps 31 arranged side by side above the two transmission assemblies along the length direction of the heat-insulating channel 9. The upper infrared lamps 31 are downwardly disposed and fixed at both ends on the two inner side walls facing the heat-insulating channel 9, so as to irradiate infrared rays on the top surfaces of the battery cells 10 carried on the transmission surfaces of the two transmission assemblies for heating and drying. Correspondingly, the lower heating assembly 4 includes lower infrared lamps 41 arranged side by side above the two transmission assemblies along the length direction of the heat-insulating channel 9. The lower infrared lamps 41 are upwardly disposed and fixed at both ends on the two inner side walls facing the heat-insulating channel 9, so as to irradiate infrared rays on the bottom surfaces of the battery cells 10 carried on the transmission surfaces of the two transmission assemblies for heating and drying. Since the two transmission assemblies support the battery cells 10 at different positions and are separated, the infrared rays irradiated upward by the lower infrared lamps 41 can cover the bottom surface of the lower infrared lamps 41, and cooperate with the upper heating assembly 3 to achieve comprehensive heating and drying of the battery cells 10.

[0047] A further improvement is that baffles 91 are provided at both ends of the heat-insulating channel 9 , and the heat-insulating channel 9 is connected to an air extraction pump 92 .

[0048] By setting the baffle 91, the diffusion of heat in the insulation channel 9 can be further reduced. After a period of use, the moisture concentration in the insulation channel 9 increases. At this time, the moisture in the insulation channel 9 is discharged through the vacuum pump 92, so that external dry air can enter the insulation channel 9 and reduce the humidity in the insulation channel 9.

[0049] A further improvement is that the three transmission units each include two transmission wheels 6 that are coaxially connected and correspond one-to-one to the two transmission belts 2 in each transmission component. The three transmission units are connected with an adjustment mechanism, which is used to simultaneously adjust the distance between the two transmission wheels 6 in each transmission unit to simultaneously adjust the spacing between the two transmission belts 2 in the two transmission components.

[0050] By providing an adjustment mechanism, the distance between the two conveyor belts 2 can be changed to accommodate battery cells 10 of different sizes, thereby expanding the scope of application.

[0051] A further improvement is that in each transmission unit, a concentric shaft 7 is passed through the coaxial centerline between the two opposite transmission wheels 6, and corresponding convex keys 71 and recesses 62 are provided between the concentric shaft 7 and the corresponding transmission wheels 6; the adjustment mechanism includes a translation unit 8 which is arranged opposite and respectively connected to the transmission wheels 6 in each transmission unit, and the moving direction of the output end of the translation unit 8 is consistent with the distribution direction of the two transmission belts 2 in the transmission assembly.

[0052] By means of the matching convex keys 71 and recesses 62 between the concentric shaft 7 and the transmission wheel 6, an axial relative sliding connection and a radial relative fixed connection are achieved between the concentric shaft 7 and the transmission wheel 6, that is, after the concentric shaft 7 rotates, the transmission wheel 6 also rotates, thereby facilitating the rotation of the transmission belt 2, and the transmission wheel 6 can slide axially along the concentric shaft 7. The two translation units 8 are used to control the movement of the two transmission wheels 6 respectively, adjust the axial position of the transmission wheel 6, and then adjust the axial position of the transmission belt 2, so as to realize the horizontal distance adjustment of the two transmission belts 2 in each transmission component to carry and transmit battery cells 10 of different sizes.

[0053] In order to achieve synchronous axial movement of the transmission wheel 6 and the transmission belt 2 , each transmission wheel 6 is provided with an annular groove 61 coaxial with itself, and the inner wall of the annular groove 61 is sealed with the corresponding transmission belt 2 .

[0054] To be more specific, in this embodiment, the base 1 is a horizontal rectangular plate. The length direction of the base 1 is consistent with the transmission direction of the transmission component, and the width direction is consistent with the distribution direction of the two transmission belts 2 in the transmission component. A transmission frame 11 is provided above the four corners of the base 1. A first bearing 111 is provided on the transmission frame 11. Among the three transmission units, the two transmission units located at the end have corresponding concentric shafts 7 at both ends connected to the first bearing 111. The inner ring and outer ring of the first bearing 111 are respectively connected to the concentric shaft 7 and the transmission frame. 11 connection, in the transmission unit located in the middle, its corresponding coaxial shaft 7 is fixedly connected to the input end of the drive motor 5 coaxially, and the drive motor 5 is fixed to the outside of the heat insulation channel 9; the convex key 71 is integrally formed on the circumferential outer edge of the concentric shaft 7 and extends along the axial direction of the concentric shaft 7, and the transmission wheel 6 is provided with a through-hole coaxial with its own centerline and for the concentric shaft 7 to pass through in a sealed manner, and a recess 62 adapted to the convex key 71 is provided on the inner wall of the through-hole, so that the synchronous rotation and axial sliding between the concentric shaft 7 and the transmission wheel 6 are conveniently achieved.

[0055] In order to facilitate the adjustment of the horizontal distance between the two transmission belts 2 in the transmission assembly with the two translation units 8, in the transmission unit, the two transmission wheels 6 are connected to the bracket 72 on the opposite side through the second bearing 73. Specifically, the inner ring of the second bearing 73 is fixedly connected to the transmission wheel 6 coaxially and the concentric shaft 7 passes through the inner ring of the second bearing 73. The outer ring of the second bearing 73 is fixedly connected to the bracket 72. The bottom of the bracket 72 on the same side of the three transmission units is fixedly connected through the translation frame 85. A slider 86 is fixed on the translation frame 85, and the slider 86 slides with There is a slide rod 12, which extends along the width direction of the base 1. The two ends of the slide rod 12 are fixed to the top of the base 1 through fixed blocks; the bottom of the translation frame 85 is provided with rollers 87 distributed along the length direction of the base 1, and the axis of the roller 87 is parallel to the length direction of the base 1. The wheel surface of the roller 87 is in contact with the top surface of the base 1 to support the translation frame 85, the bracket 72 and the transmission wheel 6 corresponding to the bracket 72, so that after the translation unit 8 is running, it can drive the transmission wheel 6 and the transmission belt 2 to move smoothly along the width direction parallel to the base 1.

[0056] The translation unit 8 includes a translation motor 81, a screw 82 and a screw sleeve 83, wherein the translation motor 81 is fixed to the outside of the heat insulation channel 9, the output end passes through the side wall of the heat insulation channel 9 and is fixedly connected to the screw 82 coaxially, the screw 82 is threadedly connected to the screw sleeve 83, and the screw sleeve 83 is fixed above the translation frame 85. The center of the top surface of the base 1 is also fixed with a shaft sleeve 84 extending along its own width direction, and the end of the screw 82 away from the translation motor 81 rotates on the inner side of the shaft sleeve 84.

[0057] After adopting the above structure, the translation motor 81 is started, driving the screw 82 to rotate around its own axis, acting on the screw sleeve 83, and driving the translation frame 85 to move in a width direction parallel to the base 1 through the screw sleeve 83, adjusting the position of the bracket 72, and then changing the position of the second bearing 73 and the transmission wheel 6. Since an annular groove 61 is provided on the circumferential outer edge of the transmission wheel 6, the annular groove 61 is sealed and connected to the conveyor belt 2. Specifically, the width of the annular groove 61 is consistent with the width of the conveyor belt 2, so that after the transmission wheel 6 moves in the width direction of the base 1, the annular groove 61 can drive the conveyor belt 2 to move in a width direction parallel to the base 1, adjust the position of the conveyor belt 2, and then change the spacing of the conveyor belt 2, so that the device can be suitable for the transmission of battery cells 10 of different sizes.

[0058] The baffle 91 is also provided with three through holes 911 distributed side by side in the vertical direction and extending along the width direction of the base 1. Among the three through holes 911, the two through holes 911 located at the top and the middle are for the upper and lower layers of the conveyor belt 2 to pass through, and the through hole 911 located at the bottom is for the translation frame 85 to pass through.

[0059] A further improvement is that the conveyor belt 2 includes a rubber inner layer 21 and a sponge outer layer 22, and the rubber inner layer 21 and the sponge outer layer 22 are both oval in shape, wherein the circumferential outer edge of the rubber inner layer 21 is fixedly connected to the circumferential inner wall of the sponge outer layer 22, and the inner side wall and the side walls at both ends of the rubber inner layer 21 are sealed to the inner wall of the annular groove 61.

[0060] After adopting the above structure, the rubber inner layer 21 contacts the transmission wheel 6. Through the rotation of the transmission wheel 6, the rubber inner layer 21 and the sponge outer layer 22 are rotated along their own circumferential direction. While the sponge outer layer 22 contacts the battery cell 10, it can also absorb moisture on the battery cell 10 at the contact part. As the sponge outer layer 22 rotates, the part that absorbs moisture moves to the heating range of the upper heating component 3 and the lower heating component 4, so that the sponge outer layer 22 is heated after being subjected to infrared radiation, which facilitates the evaporation of moisture to restore dryness and continue to absorb moisture on other battery cells 10, further improving the drying efficiency.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A drying device for back contact battery cells, characterized in that: include: A base (1), wherein a transmission frame (11) is provided on the base (1); A transmission mechanism, the transmission mechanism comprising two transmission components with the same transmission direction and arranged horizontally on the transmission frame (11), wherein the transmission surface output end of one of the two transmission components is adjacent to the transmission surface input end of the other, and the two transmission components each comprise two transmission belts (2) arranged side by side in the horizontal direction, the top surfaces of the two transmission belts (2) being slender strips arranged on the same horizontal plane to form transmission surfaces of the corresponding transmission components, and the projections of the transmission belts (2) of the two transmission components on the horizontal plane are spaced apart; A driving mechanism, the driving mechanism being used to drive each conveyor belt (2) to rotate at the same speed along its own circumferential direction; An upper heating component (3) and a lower heating component (4), wherein the upper heating component (3) is used to heat the transmission surface of at least one of the transmission components from above, and the lower heating component (4) is used to heat the transmission surfaces of the two transmission components from below.

2. The drying device for back contact solar cells according to claim 1, characterized in that: In the two transmission components, the output end of the transmission belt (2) corresponding to one of them is coaxial with the input end of the transmission belt (2) corresponding to the other.

3. The drying device for back contact solar cells according to claim 2, characterized in that: The driving mechanism comprises a driving motor (5) and three transmission units distributed along the transmission direction of the two transmission components. The three transmission units each comprise a transmission wheel (6) which rotates around its own axis on the inner side of the end of the two transmission belts (2). The axis of the transmission wheel (6) extends parallel to the distribution direction of the two transmission belts (2) in the transmission component. The driving motor (5) is connected to the two transmission wheels (6) of one of the transmission units in a driving manner. The transmission wheels (6) are connected to each other through the transmission belts (2).

4. The drying device for back contact solar cells according to claim 3, characterized in that: The three transmission units each include two transmission wheels (6) connected coaxially and corresponding one-to-one to the two transmission belts (2) in each transmission assembly. The three transmission units are connected to an adjustment mechanism, which is used to simultaneously adjust the distance between the two transmission wheels (6) in each transmission unit to simultaneously adjust the spacing between the two transmission belts (2) in the two transmission assemblies.

5. The drying device for back contact solar cells according to claim 4, characterized in that: Each transmission wheel (6) is provided with an annular groove (61) coaxial with the transmission wheel itself, and the inner wall of the annular groove (61) is sealed and connected to the corresponding transmission belt (2).

6. The drying device for back contact solar cells according to claim 4, characterized in that: In each transmission unit, a coaxial axis passes through the coaxial centerline between two opposite transmission wheels (6), and a matching convex key (71) and a recess (62) are provided between the coaxial axis (7) and the corresponding transmission wheel (6).

7. The drying device for back contact solar cells according to claim 4, characterized in that: The adjustment mechanism comprises a translation unit (8) which is arranged opposite to and respectively connected to the transmission wheel (6) in each transmission unit, and the moving direction of the output end of the translation unit (8) is consistent with the distribution direction of the two transmission belts (2) in the transmission assembly.

8. The drying device for back contact solar cells according to claim 1, characterized in that: It also includes a heat-insulating channel (9) fixed on the base (1), one adjacent end of the two transmission components is located in the heat-insulating channel (9), and the other end is arranged outside the heat-insulating channel (9), and the upper heating component (3) and the lower heating component (4) are both arranged in the heat-insulating channel (9).

9. The drying device for back contact solar cells according to claim 8, characterized in that: Baffles (91) are provided at both ends of the heat insulation channel (9).

10. The drying device for back contact solar cells according to claim 9, characterized in that: The heat-insulating channel (9) is connected to an air extraction pump (92).

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