TW202228302A - Sintering apparatus - Google Patents

Abstract

This application provides a sintering apparatus, comprising a sintering section, a temperature-drop delay section, and a cooling section. The sintering section is configured to heat and sinter a photovoltaic device at a sintering section sintering temperature, and is configured to enable the photovoltaic device to reach a sintering section preset temperature when the photovoltaic device leaves the sintering section. The temperature-drop delay section is disposed behind the sintering section in a conveying direction of the photovoltaic device, and is configured to apply a temperature-drop delay section heating temperature to the photovoltaic device conveyed from the sintering section into the temperature-drop delay section. The temperature-drop delay section heating temperature is less than the sintering section preset temperature. The cooling section is disposed behind the temperature-drop delay section in the conveying direction of the photovoltaic device. The cooling section is configured to cool the photovoltaic device conveyed from the temperature-drop delay section into the cooling section, and enable the photovoltaic device to reach a cooling section preset temperature when the photovoltaic device leaves the cooling section. The temperature-drop delay section heating temperature is greater than the cooling section preset temperature. The sintering apparatus in this application can provide a photovoltaic device with improved solar energy conversion efficiency, reduced attenuation performance, and longer service life.

Description

Sintering equipment

This case relates to the field of solar cell manufacturing, and more particularly to a sintering device for photovoltaic devices.

In the production of photovoltaic devices such as crystalline silicon solar cells and wafers, sintering equipment is required to sinter the photovoltaic devices. Sintering equipment usually includes drying section, sintering section and cooling section. The photovoltaic device is conveyed through a conveyor belt through a drying section, a sintering section and a cooling section in sequence. Each stage of the drying section, the sintering section and the cooling section needs to control the temperature of the photovoltaic device within a certain range to ensure the performance of the photovoltaic device.

This application provides a sintering equipment for processing photovoltaic devices, which includes a sintering section, a cooling delay section and a cooling section. The sintering section is provided with a sintering section heating component that provides a sintering section sintering temperature, the sintering section being configured to heat and sinter photovoltaic devices delivered into the sintering section with the sintering section sintering temperature , and is configured to make the photovoltaic device reach a preset temperature of the sintering section when the photovoltaic device leaves the sintering section. The cooling delay section is provided with a cooling delay section heating component, the cooling delay section heating component provides the heating temperature of the cooling delay section, and the cooling delay section is arranged after the sintering section along the conveying direction of the photovoltaic device The cooling delay section is configured to apply the heating temperature of the cooling delay section to the photovoltaic device transported from the sintering section into the cooling delay section, and the heating temperature of the cooling delay section is lower than the heating temperature of the cooling delay section The preset temperature of the sintering section. The cooling section is arranged after the cooling lag section along the conveying direction of the photovoltaic device, the cooling section provides a cooling temperature, and the cooling section is configured to respond to the cooling section conveyed from the cooling lag section into the cooling section. The photovoltaic device is cooled, and is configured to make the photovoltaic device reach a preset temperature of the cooling section when the photovoltaic device leaves the cooling section, wherein the heating temperature of the cooling delay section is higher than the temperature of the cooling section.

According to the above-mentioned sintering equipment of the present application, the sintering temperature of the sintering section provided by the sintering section is a multi-stage temperature.

According to the above-mentioned sintering apparatus of the present case, the sintering section includes at least two sintering units, and each of the at least two sintering units provides one sintering section sintering temperature. The cooling delay section includes a cooling delay unit, and the cooling delay unit provides a heating temperature of the cooling delay section.

According to the above sintering equipment of the present application, the cooling delay section is configured to make the photovoltaic device reach a preset temperature of the cooling delay section when the photovoltaic device leaves the cooling delay section, and the preset temperature of the cooling delay section is higher than the sintering section The average temperature of the preset temperature of the segment and the preset temperature of the cooling segment.

According to the above-mentioned sintering equipment of the present application, the preset temperature of the cooling lag section is higher than 80% of the preset temperature of the sintering section.

According to the above-mentioned sintering apparatus of the present case, the cooling section includes at least two cooling units, and the photovoltaic devices exiting from the cooling section are transported through the at least two cooling units in sequence. The cooling delay section is configured such that the temperature reduction speed of the photovoltaic device in the cooling delay section is smaller than the temperature reduction speed of the photovoltaic device in the cooling unit closest to the cooling delay section.

According to the above-mentioned sintering equipment of the present case, the cooling delay section has a cooling delay section length along the conveying direction, and the cooling delay section length and the cooling delay section heating temperature are set so that the photovoltaic device is The temperature reduction speed in the cooling delay section is lower than the temperature reduction speed of the photovoltaic device in the cooling unit closest to the cooling delay section.

According to the above-mentioned sintering equipment of the present application, the heating temperature of the cooling delay section is higher than or equal to the preset temperature of the cooling delay section.

According to the above sintering equipment of the present application, the length of the cooling delay section is 30%-70% of the length of one of the at least two sintering units.

According to the above-mentioned sintering equipment of the present application, the cooling lag section includes an upper furnace hearth, a lower hearth and a conveying channel, the heating components are arranged in the upper furnace hearth and the lower furnace hearth, and at least a part of the upper furnace hearth and the A space is provided between at least a portion of the lower furnace to form the conveying channel for allowing the photovoltaic device to pass therethrough. The upper hearth and the lower hearth are provided with partition plates at both ends along the conveying direction, so that the upper hearth and the lower hearth are separated from the sintering section and the cooling section.

The sintering equipment in this case can increase the solar energy conversion efficiency of the photovoltaic device, reduce the attenuation performance and prolong the service life.

Other features, advantages and embodiments of the present invention may be set forth or become apparent from consideration of the following detailed description, drawings, and claims. Furthermore, it should be understood that both the foregoing summary and the following detailed description are exemplary, and are intended to provide further explanation without limiting the scope of the claimed invention. However, the detailed description and specific examples are only indicative of preferred embodiments of the present invention. Various changes and modifications within the spirit and scope of the present invention will become apparent to those skilled in the art from this detailed description.

Various embodiments of the present invention will be described below with reference to the accompanying drawings which form a part of this specification. It should be understood that although directional terms such as "upper," "lower," "front," "rear," "left," "right," etc. are used in this case, directions or orientations are used to describe various examples of this case. Structural parts and elements, but these terms are used herein for convenience of description only, based on the example orientations shown in the drawings. Since the embodiments disclosed in this application can be arranged in different orientations, these directional terms are used for illustration only and should not be regarded as limiting. In the following figures, the same reference numerals are used for the same parts.

FIG. 1 is a front view of a sintering apparatus 100 according to an embodiment of the present application, to illustrate a schematic block diagram structure of the sintering apparatus 100 . As shown in FIG. 1 , the sintering equipment 100 includes a drying section 101 , a sintering section 102 , a temperature-lowering delay section 103 and a cooling section 104 . The photovoltaic device to be processed is transported by a conveyor belt, and passes through the drying section 101 , the sintering section 102 , the cooling delay section 103 and the cooling section 104 in sequence to complete the sintering process.

The drying section 101 is provided with a drying section heating component 111, and the drying section heating component 111 provides the drying section drying temperature. The drying section heating component 111 in the drying section 101 heats the photovoltaic device at the drying temperature of the drying section, so that the photovoltaic device is heated to the preset temperature of the drying section when leaving the drying section 101, so that the photovoltaic device is heated to the preset temperature of the drying section. The organic solvent evaporated, and the photovoltaic device after drying treatment enters the sintering section 102 .

The sintering section 102 is provided with a sintering section heating component 112, and the sintering section heating component 112 provides the sintering section sintering temperature. The sintering section heating component 112 in the sintering section 102 heats the photovoltaic device at the sintering section sintering temperature, so that the photovoltaic device is heated to the preset temperature of the sintering section, that is, the temperature when the photovoltaic device is output from the sintering section 102, so as to sinter the photovoltaic device deal with. The preset temperature of the sintering section of the photovoltaic device is usually greater than 600 degrees.

The photovoltaic device after the sintering process enters the cooling delay section 103 . The cooling delay section 103 is provided with a cooling delay section heating component 113, and the cooling delay section heating component 113 provides the heating temperature of the cooling delay section. The cooling delay section heating component 113 of the cooling delay section 103 applies the heating temperature of the cooling delay section to the photovoltaic device, so that the photovoltaic device reaches the preset temperature of the cooling delay section, that is, the output temperature of the photovoltaic device from the cooling delay section 103 . temperature. The heating temperature of the cooling lag section is lower than the sintering temperature of the sintering section and lower than the preset temperature of the sintering section. The preset temperature of the cooling delay section is lower than or equal to the heating temperature of the cooling delay section. Because the heating temperature in the cooling lag section is lower than the sintering temperature in the sintering section and the preset temperature in the sintering section, although the cooling lag section 103 provides the heating temperature, the photovoltaic cells with the preset temperature in the sintering section entering the cooling lag section 103 The device is actually cooled in the cooling lag section 103 and this cooling rate is delayed or prevented relative to the direct input of the photovoltaic device from the sintering section 102 to the cooling section 104 . In other words, the cooling delay section 103 can make the photovoltaic device with a higher temperature just come out of the sintering section 102 to cool down at a slower rate, so that the photovoltaic device can be cooled down to a desired temperature at a reduced cooling rate.

The photovoltaic device from the cooling delay section 103 enters the cooling section 104 , and the cooling section 104 can provide the photovoltaic device with the cooling section cooling temperature, so that the photovoltaic device reaches the preset temperature of the cooling section, that is, the temperature when the photovoltaic device is output from the cooling section 104 . The preset temperature of the cooling section is lower than the preset temperature of the cooling delay section. The preset temperature of the cooling section is usually 40-80 degrees. The cooling section 104 enables the photovoltaic device to cool down at a faster, unlag, or unimpeded rate. As an example, the cooling section 104 is provided with cooling equipment but not with heating equipment. The cooling device may be an air-cooled device (eg, a fan) and/or a water-cooled device. When the cooling device is an air-cooled device, the cooling temperature in the cooling section 104 is substantially the ambient temperature of the atmosphere. When the cooling device is a water cooling device, the cooling temperature in the cooling section 104 is lower than the atmospheric ambient temperature.

It should be noted that, although not shown in FIG. 1 , the drying section 101 , the sintering section 102 , the cooling delay section 103 and the cooling section 104 are provided with communicating channels. The conveyor belt is arranged in the conveying channel. Photovoltaic installations are placed on conveyor belts. When the conveyor belt is running, the photovoltaic device can pass through the drying section 101 , the sintering section 102 , the cooling delay section 103 and the cooling section 104 in sequence.

FIG. 2A is a perspective view of the cooling delay section 103 of the sintering apparatus 100 shown in FIG. 1 . FIG. 2B is a side view of the cooling lag section 103 of the sintering apparatus 100 shown in FIG. 2A . As shown in FIGS. 2A-2B , the cooling delay section 103 includes a support frame 210 , an upper furnace 201 and a lower furnace 202 . The upper hearth 201 and the lower hearth 202 are supported by the support frame 210 so as to be held at predetermined positions. A space is set between a part of the upper furnace chamber 201 and a part of the lower furnace chamber 202 to form a conveying channel 203 . In the example of the present application, the cooling delay section 103 is provided with two transmission channels 203 on the left and right side by side. The inlet of the conveying passage 203 of the cooling delay section 103 is communicated with the outlet of the conveying passage in the sintering section 102, and the outlet of the conveying passage 203 of the cooling lag section 103 is communicated with the inlet of the conveying passage in the cooling section 104, so that the flow from the sintering section is The photovoltaic devices exiting 102 can enter the transfer channel 203 of the cooling lag section 103 , and the photovoltaic devices exiting the cooling lag section 103 can enter the cooling section 104 . In addition, a conveyor belt (not shown) is also provided in the conveying channel 203 for carrying and conveying the photovoltaic device.

FIG. 3A is an exploded view from bottom to top of the cooling lag section 103 of the sintering apparatus 100 shown in FIG. 2A to show the structural details of the upper furnace 201 . FIG. 3B is an exploded view from above of the cooling lag section 103 of the sintering apparatus 100 shown in FIG. 2A , to show the structural details of the lower furnace 202 . FIG. 3C is a cross-sectional view of the cooling lag section 103 of the sintering apparatus 100 shown in FIG. 2A , to illustrate the cross-sectional structures of the upper furnace chamber 201 and the lower furnace chamber 202 .

As a whole, as shown in Figures 3A and 3C, the upper furnace chamber 201 includes a casing, a gasket and a heating element. A gasket is provided within the housing. Specifically, the casing includes an upper casing 301 , a left casing 302 , a right casing 303 , a rear casing 304 and a front casing 305 . The left case 302 , the right case 303 , the rear case 304 and the front case 305 are respectively formed to extend downward from the left edge, the right edge, the rear edge and the front edge of the upper case 301 , respectively. The upper casing 301 , the left casing 302 , the right casing 303 , the rear casing 304 and the front casing 305 are enclosed to form a cavity for accommodating the gasket and heating components. In the embodiment of the present case, the liner is made of rock wool. Rock wool has good thermal insulation properties, so that the heat generated by the heating element is retained in the cavity enclosed by the shell.

The liners in the upper hearth 201 include upper liners 311 , left liners 312 , right liners 313 , rear liners 314 , front liners 315 , spacer liners 317 , and isolation liners 316 . The upper pad 311 , the left pad 312 , the right pad 313 , the rear pad 314 and the front pad 315 are respectively disposed on the inner wall of the cavity. In other words, the upper gasket 311 is close to the upper casing 301, the left gasket 312 is close to the left casing 302, the left gasket 312 is close to the left casing 302, the right gasket 313 is close to the right casing 303, and the rear gasket The pad 314 abuts the rear case 304 and the front pad 315 abuts the front case 305 . The spacer pads 317 lie transversely in the cavity and are arranged generally parallel to the upper pads 311 . The spacer liner 317 is arranged at a distance from the upper spacer 311 so that the upper spacer 311 , the left spacer 312 , the right spacer 313 , the rear spacer 314 , the front spacer 315 and the spacer spacer 317 are enclosed to form a spaced volume. The cavity 321 is formed, and the left gasket 312, the right gasket 313, the rear gasket 314, the front gasket 315 and the spacer gasket 317 are enclosed to form a heating component cavity 322 with an opening below. The heating element is disposed in the heating element cavity 322 . The isolation liner 316 is vertically disposed in the housing to partition both the spacer cavity 321 and the heating part cavity 322 into two independent spacer cavity 321 and two independent heating part cavity 322 . Two independent spaced cavities 321 and two independent heating component cavities 322 are arranged corresponding to the two transfer channels 203 .

The upper furnace chamber 201 also includes two gas introduction passages 331 for enabling gas (eg, air) outside the casing to enter the spaced cavity 321 through the gas introduction passages 331 . One of the gas introduction passages 331 penetrates the left casing 302 and the left gasket 312 , and the other gas introduction passage 331 penetrates the right casing 303 and the right gasket 313 . When the cooling lag section 103 operates, the heating element generates heat. The two gas introduction channels 331 introduce external gas into the spaced chamber 321 . Since the spacer liner 317 is made of rock wool, and the rock wool has holes, the gas can pass through the spacer liner 317 and flow in the cavity enclosed by the casing. The flow of the gas can make the heat generated by the heating component more uniform in the cavity of the casing, thereby facilitating uniform heating of the photovoltaic device.

As shown in further detail in the upper furnace chamber 201 in FIG. 3A, the heating components in the upper furnace chamber 201 include eight heating tubes 341 for generating heat. Specifically, the eight heating pipes 341 are divided into two groups, and each group includes four heating pipes 341 . The two groups of heating tubes 341 are respectively disposed in the corresponding heating component chambers 322 . The length direction of the heating pipe 341 is arranged transversely to the conveying direction of the conveyor belt. When the photovoltaic device is transported by the conveyor belt, one photovoltaic device will pass through the four heating pipes 341 in sequence, thereby increasing the temperature of the photovoltaic device. The heating temperature of the heating element is adjustable. As an example, the operator can adjust the magnitude of the current flowing through the heating tube 341 to adjust the heating temperature of the heating element.

As shown in FIGS. 3A and 3C , as a whole, the structure of the lower furnace 202 is substantially similar to that of the upper furnace 201 . Specifically, the lower furnace 202 includes a casing, a liner, and heating components. A gasket is provided within the housing. The case includes a lower case 351 , a left case 352 , a right case 353 , a rear case 354 and a front case 355 . The left case 352 , the right case 353 , the rear case 354 and the front case 355 are respectively formed to extend upward from the left edge, the right edge, the rear edge and the front edge of the lower case 351 , respectively. The lower case 351 , the left case 352 , the right case 353 , the rear case 354 and the front case 355 enclose a cavity for accommodating the gasket and the heating part. In the embodiment of the present case, the liner is made of rock wool. Rock wool has good thermal insulation properties, so that the heat generated by the heating element is retained in the cavity enclosed by the shell.

The pads in the lower hearth 202 include a lower pad 361 , a left pad 362 , a right pad 363 , a rear pad 364 , a front pad 365 , a spacer pad 367 , and an isolation pad 366 . The lower pad 361, the left pad 362, the right pad 363, the rear pad 364 and the front pad 365 are respectively disposed on the inner wall of the cavity. In other words, the lower gasket 361 is close to the lower casing 351, the left gasket 362 is close to the left casing 352, the left gasket 362 is close to the left casing 352, the right gasket 363 is close to the right casing 353, and the rear gasket The pad 364 abuts the rear case 354 and the front pad 365 abuts the front case 355 . The spacer pads 367 lie transversely in the cavity and are disposed generally parallel to the lower pads 361 . The spacer liner 367 is arranged at a distance from the lower liner 361 so that the lower liner 361 , the left liner 362 , the right liner 363 , the rear liner 364 , the front liner 365 and the spacing liner 367 are enclosed to form a spacing volume The cavity 371 is formed, and the left pad 362, the right pad 363, the rear pad 364, the front pad 365 and the spacer pad 367 are enclosed to form a heating component cavity 372 with an opening below. The heating element is disposed in the heating element cavity 372 . The isolation liner 366 is vertically disposed in the housing to partition both the spacer cavity 371 and the heating part cavity 372 into two independent spacer cavity 371 and two independent heating part cavity 372 . Two independent spaced cavities 371 and two independent heating component cavities 372 are arranged corresponding to the two transfer channels 203 .

The lower furnace chamber 202 also includes two gas introduction passages 381 for enabling gas (eg, air) outside the casing to enter the spaced cavity 371 through the gas introduction passages 381 . One of the gas introduction passages 381 penetrates the left casing 352 and the left gasket 362 , and the other gas introduction passage 381 penetrates the right casing 353 and the right gasket 363 . When the cooling lag section 103 operates, the heating element generates heat. Two gas introduction passages 381 introduce external gas into the spaced chamber 371 . Since the spacer liner 367 is made of rock wool, and the rock wool has holes, the gas can pass through the spacer liner 367 and flow in the cavity enclosed by the casing. The flow of the gas can make the heat generated by the heating component more uniform in the cavity of the casing, thereby facilitating uniform heating of the photovoltaic device.

As shown in further detail in the lower furnace 202 in FIG. 3B, the heating components in the lower furnace 202 include eight heating tubes 391 for generating heat. Specifically, the eight heating pipes 391 are divided into two groups, and each group includes four heating pipes 391 . The two groups of heating tubes 391 are respectively disposed in the corresponding heating component cavities 372 . The length direction of the heating pipe 391 is arranged transversely to the conveying direction of the conveyor belt. When the photovoltaic device is transported by the conveyor belt, one photovoltaic device will pass through the four heating pipes 391 in sequence. As a result, the temperature of the photovoltaic device is increased. The heating temperature of the heating element is adjustable. As an example, the operator can adjust the magnitude of the current flowing through the heating tube 391 to adjust the heating temperature of the heating element.

In addition, the lower furnace 202 also includes eight quartz plates 392 and four conveyor belt supports 393 . Specifically, each of the eight quartz plates 392 is arranged above a corresponding one of the eight heating pipes 391 to protect the heating pipes 391 to prevent foreign objects from falling on the conveyor belt from damaging the heating pipes 391 . The four belt supports 393 are divided into two groups, each group including two belt supports 393 . The two sets of conveyor belt supports 393 are respectively disposed in the corresponding heating element chambers 372 . The conveyor belt support 393 is arranged above the quartz plate 392, and both ends abut on or are connected to the casing or the gasket. The length direction of the conveyor belt supports 393 is arranged along the conveying direction of the conveyor belt, and the distance between the two conveyor belt supports 393 in each group is smaller than the width of the conveyor belt to support the conveyor belt.

Thus, the upper furnace chamber 201 and the lower furnace chamber 202 in the cooling delay section 103 form a complete furnace chamber. The furnace can apply the heating temperature of the cooling lag section, which is lower than the sintering temperature of the sintering section and the preset temperature of the sintering section, to the photovoltaic device entering the furnace from above and below, and then output the cooled photovoltaic device to the cooling delay section 103 , which is then conveyed to the cooling section 104 . The rear casing 304 and the front casing 305 in the upper furnace 201 and the rear casing 354 and the front casing 355 in the lower furnace 202 form partition plates at both ends of the conveying direction, so that the upper furnace of the cooling lag section 103 201 and the lower hearth 202 are separated from the sintering section 102 and the cooling section 104 to avoid heat dissipation.

It should be noted that although the sintering equipment in this case shows a specific number of conveying channels, heating tubes, quartz plates, conveyor belt supports, etc., those skilled in the art can understand that any number of conveying channels and heating tubes, etc. within the scope of protection in this case.

Those skilled in the art can also understand that although the heating element in this case is a heating tube, it can also be formed by other heating elements.

FIG. 4 is a schematic diagram of the distance-temperature relationship of a photovoltaic device in a prior art sintering apparatus. The abscissa represents the distance that the photovoltaic device moves along the length of the sintering device, the ordinate represents the temperature of the photovoltaic device, and the curve represents the temperature change of the photovoltaic device processed by the prior art sintering device in the sintering device. The sintering equipment shown in Figure 4 does not include a cooling delay section. That is to say, the sintering equipment shown in FIG. 4 includes a drying section, a sintering section and a cooling section which are arranged in sequence. When the photovoltaic device leaves the sintering section, the photovoltaic device will be heated to the preset temperature of the sintering section. Then the photovoltaic device enters the cooling section, and is rapidly cooled in the cooling section to the preset temperature of the cooling section. Although the photovoltaic devices produced by the existing sintering equipment can meet the needs of use under the existing requirements and in most cases, the performance or performance parameters of the finished photovoltaic device may not be good enough. For example, the photovoltaic device converts solar energy into The solar energy conversion efficiency of electrical energy and the decay rate of photovoltaic devices in use are not ideal.

The applicant has found through observation that, in the prior art equipment, the inappropriate initial cooling temperature difference between the preset temperature of the sintering section and the cooling temperature of the cooling section when the photovoltaic device is output from the sintering section will affect the performance of the photovoltaic device. Specifically, the applicant found through observation that when the photovoltaic device is output from the sintering section, the temperature of the photovoltaic device (ie, the preset temperature of the sintering section) is relatively high (for example, 700-800°C), which will make the temperature of the photovoltaic device and the cooling effect. If the temperature difference between the cooling temperatures (for example, 40-80°C) is too large, the photovoltaic device will cool down too quickly when it first enters the cooling stage, and the rapid cooling at this time will cause the solar energy conversion of the photovoltaic device in use. Reduced efficiency, ie, when a photovoltaic device converts received light energy into electrical energy, in use, its solar energy conversion efficiency decreases. Correspondingly, in use, the photovoltaic device has a high attenuation performance over time and a short service life.

FIG. 5 is a schematic diagram of the distance-temperature relationship of the photovoltaic device in the sintering apparatus 100 shown in FIG. 1 . The abscissa represents the distance that the photovoltaic device moves along the length direction of the sintering device in the sintering device, the ordinate represents the temperature of the photovoltaic device, and the solid line curve represents the photovoltaic device processed by the sintering device 100 shown in FIG. 1 in the sintering device. temperature changes. In addition, the dotted curve in FIG. 5 represents the temperature change in the sintering apparatus of the photovoltaic device of FIG. 4 processed by the sintering apparatus which does not include the cooling lag section.

The sintering apparatus 100 shown in FIG. 5 includes a cooling delay section 103 . Specifically, the sintering equipment 100 includes a drying section 101 , a sintering section 102 , a temperature-lowering delay section 103 and a cooling section 104 which are arranged in sequence. In the embodiment of the sintering apparatus 100 shown in FIG. 5, the sintering section 102 is a multi-stage apparatus. The sintering temperature of the sintering section provided by the sintering section 102 is a multi-stage temperature. Specifically, the sintering section 102 includes three sintering units (ie, a first sintering unit, a second sintering unit, and a third sintering unit). Each sintering unit includes a sintering section heating element. The first sintering unit includes a first sintering section heating element 501 which provides the first sintering section sintering temperature. The second sintering unit includes a second sintering section heating element 502 that provides the second sintering section sintering temperature. The third sintering unit includes a third sintering section heating component 503, which provides the third sintering section sintering temperature. The sintering temperature of the first sintering section is lower than or equal to the sintering temperature of the second sintering section, and the sintering temperature of the second sintering section is lower than or equal to the sintering temperature of the third sintering section, so that the sintering section 102 continuously increases the temperature of the photovoltaic device to continuously heat the photovoltaic device. The device is heated and sintered. The sintering section 102 is configured such that when the photovoltaic device leaves the sintering section 102, the temperature of the photovoltaic device is the sintering section preset temperature. In the sintering apparatus 100 shown in FIG. 5 , the cooling delay section 103 includes a cooling delay unit, which provides a heating temperature in the cooling delay section. The cooling delay section 103 is configured to apply the heating temperature of the cooling delay section lower than the preset temperature of the sintering section to the photovoltaic device, so that the photovoltaic device cools down at a slower or delayed speed. The cooling delay section 103 is also configured so that when the photovoltaic device leaves the cooling delay section 103, the temperature of the photovoltaic device reaches an expected preset temperature in the cooling delay section.

In the embodiment of the sintering apparatus 100 shown in FIG. 5, the cooling section 104 is a multi-stage apparatus. The cooling section cooling temperature provided by the cooling section 104 is a multi-stage temperature. Specifically, cooling section 104 includes three cooling units (ie, a first cooling unit, a second cooling unit, and a third cooling unit). Each cooling unit can provide a cooling temperature. Specifically, the first cooling unit can provide the first cooling unit cooling temperature. The second cooling unit can provide the second cooling unit cooling temperature. The third cooling unit can provide the third cooling unit cooling temperature. The cooling temperature of the first cooling unit is higher than or equal to the cooling temperature of the second cooling unit, and the cooling temperature of the second cooling unit is higher than or equal to the cooling temperature of the third cooling unit, so that the cooling section 104 continuously cools the photovoltaic device. The cooling section 104 is configured such that when the photovoltaic device leaves the cooling section 104, the temperature of the photovoltaic device is lowered to a preset temperature of the cooling section. The preset temperature of the cooling section is lower than the preset temperature of the cooling delay section. Moreover, the cooling temperature of each cooling unit is lower than the heating temperature of the cooling lag section. In the embodiment of the sintering apparatus 100 shown in FIG. 5 , the cooling temperatures provided by each cooling unit are equal, and are approximately equal to the temperature of the environment in which the sintering apparatus 100 is located. Further, in the embodiment of the sintering apparatus 100 shown in FIG. 5 , fans 511 , 512 , and 513 are provided in each cooling unit to accelerate the heat dissipation of the photovoltaic devices in the cooling section 104 .

The preset temperature of the sintering section, the preset temperature of the cooling delay section and the preset temperature of the cooling section are all determined by the photovoltaic device to be processed. For example, the decision is made according to the use and kind of photovoltaic device to be processed. As mentioned above, the applicant found that if the photovoltaic device at a higher temperature output from the sintering section is cooled too fast, the solar energy conversion efficiency of the photovoltaic device in use will decrease. It is found in this case that slowing down the cooling rate of the photovoltaic device in the high temperature section after the sintering section can improve the solar energy conversion efficiency of the photovoltaic device in use. For different photovoltaic devices, the specific values of the high temperature section after coming out of the sintering section will also be different, so the preset temperature of the cooling delay section of different photovoltaic devices will also be different. Generally speaking, the preset temperature of the cooling lag section is higher than the average temperature of the preset temperature of the sintering section and the preset temperature of the cooling section. In some embodiments, the preset temperature of the cooling lag section is higher than 80% of the preset temperature of the sintering section.

The heating temperature of the cooling delay section is set to be higher than or equal to the preset temperature of the cooling delay section. Although the cooling delay section heating component 113 in the cooling delay section 103 is set to be heated at the heating temperature of the cooling delay section, since the upper furnace 201 and the lower furnace 202 form a complete furnace, the furnace has a certain amount of heat dissipation, which makes The ambient temperature in the furnace is lower than the heating temperature of the cooling delay section, so when the photovoltaic device leaves the cooling delay section 103, it can only be maintained at the preset temperature of the cooling delay section that is lower than or equal to the heating temperature of the cooling delay section.

After the preset temperature of the cooling delay section is determined, the heating temperature of the cooling delay section and the length of the cooling delay section along the conveying direction of the cooling delay section 103 are determined according to the photovoltaic device to be processed and the speed of the photovoltaic device passing through the cooling delay section 103 Wait for the decision. The setting of the length of the cooling lag section should meet the requirement that the photovoltaic device has enough time in the cooling delay section to produce the cooling effect without affecting the overall processing efficiency of the photovoltaic device. In some embodiments, the length of the cooling delay section is 30%-70% of the length of a sintering unit. After the length of the cooling lag section is determined, the preset temperature of the cooling lag section can be determined according to the length of the cooling lag section and the preset temperature of the cooling lag section, so that the temperature of the photovoltaic device decreases to the level of cooling after the photovoltaic device is transported through the length of the lag section Lag segment preset temperature.

The temperature reduction rate refers to the ratio of the temperature reduction value T to the length L when the photovoltaic device passes through a length L. Referring to the sintering apparatus 100 shown in FIG. 5 , the temperature reduction rate of the photovoltaic device in the cooling lag section 103 is T1/L1, and the temperature reduction rate of the photovoltaic device in the first cooling unit is T2/L2. As shown by the dotted line in FIG. 5 , if the cooling delay section 103 is not provided as in FIG. 4 , and the photovoltaic device directly enters the cooling section 104 after being output from the sintering section 102 , the transport length L1 of the photovoltaic device after exiting the sintering section 102 The cooling rate in this section will be greater than the temperature decreasing rate T1/L1 of the photovoltaic device in the cooling lag section 103 , because the preset temperature of the sintering section when the photovoltaic device exits the sintering section 102 and the cooling temperature provided by the cooling section 104 are between the The temperature difference is larger than the temperature difference between the preset temperature of the sintering section when the photovoltaic device exits the sintering section 102 and the heating temperature of the cooling delay section provided by the cooling delay section 103 .

Further, in the embodiment shown in FIG. 5 , the cooling delay section 103 and the cooling section 104 are configured such that the temperature reduction rate of the photovoltaic device in the cooling delay section 103 is smaller than that in the temperature reduction delay section 103 of the photovoltaic device closest to the cooling delay section 103 . The rate of temperature reduction in the cooling unit (the first cooling unit in this embodiment). That is, T1/L1<T2/L2. Further, the cooling lag section 103 is set so that the preceding temperature reduction speed of the photovoltaic device in the cooling delay section 103 is smaller than the subsequent temperature reduction speed. The cooling delay section 103 can prevent the temperature of the photovoltaic device from dropping too quickly in the high temperature section after being output from the sintering section, so as to have a heat preservation effect on the photovoltaic device leaving the sintering section 102 . After the photovoltaic device is output from the sintering section 102, prolonging the time that the photovoltaic device after the sintering treatment is at a higher temperature is beneficial to increase the solar energy conversion efficiency of the produced photovoltaic device in use, reduce the attenuation performance of the photovoltaic device, prolong the its service life. As an example, for the same application and type of photovoltaic device, the solar energy conversion of a photovoltaic device that passes through the cooling delay section 103 in the processing program is compared to a photovoltaic device that does not pass through the cooling delay section 103 in the processing program. Efficiency can be increased by 5%-10%, and its service life can be extended by 1%-2%.

As an example, in operation, for a certain type and application of photovoltaic devices, the sintering temperature of the sintering section (eg, the sintering temperature of the third sintering section) is 800°C, the preset temperature of the sintering section is 780°C, and the cooling delay is The heating temperature of the section is 750°C, the preset temperature of the cooling delay section is 720°C, and the preset temperature of the cooling section (for example, the cooling temperature of the fourth cooling unit) is 60°C. That is, the cooling delay section 103 can lower the temperature of the photovoltaic device from 780°C to 720°C, and then the cooling section 104 lowers the temperature of the photovoltaic device from 720°C to 60°C.

As another example, for a certain type of photovoltaic device, the preset temperature of the drying section is 300℃-400℃, the preset temperature of the sintering section is 700℃-900℃, and the heating temperature of the cooling delay section is 650℃- 750℃, the preset temperature of the cooling section is 40℃-80℃. The length of the cooling delay section is 600 mm, and the speed of the photovoltaic device passing through the cooling delay section 103 is 11000 mm/min.

In this case, the temperature difference between the preset temperature of the sintering section when the photovoltaic device is output from the sintering section 102 and the temperature applied at the input end of the cooling section 104 (ie, the cooling temperature of the first cooling unit) is divided into two relatively small, suitable temperature reductions temperature difference, and use the cooling delay section 103 and the cooling section 104 to cool the photovoltaic device in two different time periods respectively. Because the photovoltaic device reaches a higher preset temperature of the sintering section when output from the sintering section 102 , the cooling delay section 103 should be set to an appropriate heating temperature of the cooling delay section, so that the sintering section of the photovoltaic device output from the sintering section 102 is preset The temperature difference between the temperature and the heating temperature of the cooling delay section of the cooling delay section 103 is in an appropriate range, so as to control the cooling speed of the photovoltaic device in the first stage after output from the sintering section 102 . In the cooling delay section 103, the photovoltaic device is cooled at a suitable cooling speed, so that the photovoltaic device is lowered to the intermediate state temperature (ie, the preset temperature in the cooling delay section) at a suitable cooling speed in the cooling delay section 103, and the photovoltaic The device reaches the intermediate state temperature (ie, the preset temperature of the cooling delay section) when the device is output from the cooling delay section 103 . The cooling delay section 103 reduces the temperature difference between the temperature of the photovoltaic device output from the sintering section 102 and the heating temperature of the cooling delay section provided by the cooling delay section 103 by appropriately selecting the applied heating temperature of the cooling delay section, thereby reducing the temperature difference. Reduce the cooling rate of the photovoltaic device when it is at a higher temperature after output from the sintering section 102 . In the cooling section 104, since the temperature reduction delay section 103 has reduced the temperature of the photovoltaic device at a suitable cooling rate, the photovoltaic device enters the cooling section 104 at a reduced temperature, so that the temperature of the photovoltaic device is the same as the cooling provided by the cooling section 104. The temperature difference before the temperature is also reduced, so that the photovoltaic device also cools down at a suitable cooling rate in the cooling section 104 to the preset temperature of the cooling section.

In this case, by setting the cooling delay section 103 and the cooling section 104 two sections for cooling the photovoltaic device output from the sintering section 102, a temperature difference of the photovoltaic device in the prior art sintering equipment is divided into two suitable temperature differences , Small cooling temperature difference to control the appropriate cooling speed of the photovoltaic device from the preset temperature of the sintering section to the preset temperature of the cooling section, especially the appropriate cooling speed when the photovoltaic device is at a higher temperature when it is output from the sintering section, Thus, the solar energy conversion efficiency of the photovoltaic device during use can be improved and the attenuation performance of the photovoltaic device can be reduced.

It should also be noted that although the sintering section 102 includes three sintering units and the cooling section 104 includes four cooling units in this case, those skilled in the art can understand that the sintering section 102 including at least two sintering units and the sintering section 102 including at least two sintering units The cooling sections 104 of both cooling units are within the scope of protection of the present case.

Although only some of the features of the present invention have been illustrated and described herein, many modifications and changes will occur to those skilled in the art. It should therefore be understood that the appended claims are intended to cover all such modifications and variations as fall within the essential spirit of the present case.

100: Sintering equipment 101: Drying section 102: Sintering section 103: cooling delay section 104: Cooling section 111: Heating parts of drying section 112: Sintering section heating parts 113: Heating parts of cooling lag section 201: Upper Hearth 202: Lower Hearth 203: Transmission channel 210: Support frame 301: Upper shell 302: Left housing 303: Right housing 304: Rear shell 305: Front housing 311: Upper liner 312: Left Pad 313: Right Pad 314: Rear Pad 315: Front Pad 316: Release liner 317: Spacer liner 321: Spacer cavity 322: Heating component cavity 331: gas introduction channel 341: Heating tube 351: Lower shell 352: Left housing 353: Right housing 354: Rear Housing 355: Front housing 361: Underpad 362: Left Pad 363: Right Pad 364: Rear Pad 365: Front Pad 366: Release liner 367: Spacer liner 371: Spacer cavity 372: Heating component cavity 381: gas introduction channel 391: Heating tube 392: Quartz Plate 393: Conveyor Belt Support 501: Heating parts of the first sintering section 502: Second sintering section heating part 503: The third sintering section heating part 511: Fan 512: Fan 513: Fan L1: length L2: length T1: Decrease value T2: Decrease value

These and other features and advantages of the present invention may be better understood by reading the following detailed description with reference to the accompanying drawings, wherein like reference numerals refer to like parts throughout, wherein:

1 is a front view of a sintering apparatus according to an embodiment of the present case;

FIG. 2A is a perspective view of a cooling lag section of the sintering equipment shown in FIG. 1;

Fig. 2B is a side view of the cooling lag section of the sintering apparatus shown in Fig. 2A;

FIG. 3A is an exploded view from bottom to top of the cooling lag section of the sintering equipment shown in FIG. 2A ;

FIG. 3B is an exploded view from top to bottom of the cooling lag section of the sintering equipment shown in FIG. 2A;

3C is a cross-sectional view of the cooling delay section of the sintering apparatus shown in FIG. 2A;

4 is a schematic diagram of a distance-temperature relationship of a photovoltaic device of a sintering device in the prior art;

FIG. 5 is a schematic diagram of the distance-temperature relationship of the photovoltaic device of the sintering apparatus shown in FIG. 1 .

Domestic storage information (please note in the order of storage institution, date and number) none Foreign deposit information (please note in the order of deposit country, institution, date and number) none

100: Sintering equipment

101: Drying section

102: Sintering section

103: cooling delay section

104: Cooling section

111: Heating parts of drying section

112: Sintering section heating parts

113: Heating parts of cooling lag section

Claims (10)

A sintering equipment (100) for processing photovoltaic devices, characterized by comprising: A sintering section (102) provided with a sintering section heating element (112) providing a sintering section sintering temperature, the sintering section (102) being configured to use a The sintering section sintering temperature is used to heat and sinter the photovoltaic device transported into the sintering section (102), and is configured to make the photovoltaic device reach a preset sintering section temperature when it leaves the sintering section (102); A cooling delay section (103), the cooling delay section (103) is arranged after the sintering section (102) along the conveying direction of the photovoltaic device, and the cooling delay section (103) is provided with a cooling delay section for heating A component (113), the cooling delay section heating component (113) provides a cooling delay section heating temperature, and the cooling delay section (103) is configured to apply the cooling delay section heating temperature to the temperature from the cooling delay section. The sintering section (102) is transported into the photovoltaic device of the cooling delay section (103), and the heating temperature of the cooling delay section is lower than the preset temperature of the sintering section; and a cooling section (104), the cooling section (104) is arranged after the cooling delay section (103) along the conveying direction of the photovoltaic device, the cooling section (104) provides a cooling temperature, and the cooling section (104) is configured to cool the photovoltaic devices conveyed from the cooling lag section (103) into the cooling section (104) with the cooling temperature, and is configured to cause the photovoltaic devices to leave the cooling section (104) when The preset temperature of the cooling section is reached, wherein the heating temperature of the cooling delay section is higher than the cooling temperature. The sintering apparatus (100) according to claim 1, wherein: The sintering temperature of the sintering section provided by the sintering section (102) is a multi-stage temperature. The sintering apparatus (100) according to claim 1, wherein: The sintering section (102) includes at least two sintering units, each of the at least two sintering units providing a sintering section sintering temperature; The cooling delay section (103) includes a cooling delay unit, and the cooling delay unit provides a heating temperature of the cooling delay section. The sintering apparatus (100) according to claim 1, wherein: The cooling delay section (103) is configured to make the photovoltaic device reach a preset temperature in the cooling delay section when the photovoltaic device leaves the cooling delay section (103), and the preset temperature in the cooling delay section is higher than the sintering section The average temperature of the preset temperature and the preset temperature of the cooling section. The sintering apparatus (100) according to claim 4, wherein: The preset temperature of the cooling lag section is higher than 80% of the preset temperature of the sintering section. The sintering apparatus (100) according to claim 4, wherein: The cooling section (104) includes at least two cooling units, and photovoltaic devices exiting from the cooling section (104) are transported through the at least two cooling units in sequence; Wherein the cooling delay section (103) is set so that the temperature reduction rate of the photovoltaic device in the cooling delay section (103) is lower than that of the photovoltaic device in the cooling unit closest to the cooling delay section (103). temperature decrease rate. The sintering apparatus (100) according to claim 6, wherein: The cooling delay section (103) has a cooling delay section length along the conveying direction; The length of the cooling delay section and the heating temperature of the cooling delay section are set so that the temperature reduction rate of the photovoltaic device in the cooling delay section (103) is smaller than that of the photovoltaic device in the distance from the cooling delay section (103). 103) Temperature reduction rate in the nearest cooling unit. The sintering apparatus (100) according to claim 7, wherein: The heating temperature of the cooling delay section is higher than or equal to the preset temperature of the cooling delay section. The sintering apparatus (100) according to claim 3, wherein: The length of the cooling delay section (103) is 30%-70% of the length of one of the at least two sintering units. The sintering apparatus (100) according to claim 1, wherein: The cooling lag section (103) includes an upper furnace (201), a lower furnace (202) and a conveying channel (203), and the heating component is arranged in the upper furnace (201) and the lower furnace (202) , a space is provided between at least a part of the upper furnace chamber (201) and at least a part of the lower furnace chamber (202) to form the conveying channel (203) for allowing the photovoltaic device to pass through; The upper furnace chamber (201) and the lower furnace chamber (202) are provided with partition plates at both ends along the conveying direction, so that the upper furnace chamber (201) and the lower furnace chamber (202) are connected with each other. The sintering section (102) and the cooling section (104) are spaced apart.

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