Battery piece intermediate, sintering protection carrier and belt type conveying device

Abstract

The utility model discloses a battery piece intermediate, sintering protection carrier and belt conveyor, the battery piece intermediate comprises a battery piece substrate and a gas barrier film, the battery piece substrate comprises a substrate and a copper grid line arranged on the substrate, the gas barrier film at least covers and fits on the copper grid line, the sintering protection carrier is arranged on the substrate, and the sintering protection carrier is arranged on the sintering protection carrier. The copper grid lines are isolated from external oxygen or air; the problem that the copper grid lines are easy to oxidize in the sintering process of the battery piece intermediate is avoided, and the qualified rate of finished battery pieces is improved.

Description

Technical Field

[0001] This utility model relates to the field of solar cell technology, specifically to a solar cell intermediate, a sintering protection carrier, and a belt conveyor. Background Technology

[0002] Crystalline silicon solar cells typically use screen-printed silver paste followed by high- or low-temperature sintering to form ohmic contact electrodes between the semiconductor and metal to extract photogenerated carriers. This is currently the most widely used metallization method for crystalline silicon solar cells. This method is simple and is the mainstream mass production process, allowing for fine grid lines as low as approximately 45 micrometers in width. In recent years, while silicon wafer and cell manufacturing processes have continuously advanced, leading to a decrease in solar cell production costs, the proportion of expensive silver paste costs in the overall cell cost has been steadily increasing. Furthermore, the width and aspect ratio of the silver electrodes are limited by the screen-printing process and the physicochemical properties of the paste, thus hindering further improvements in cell efficiency.

[0003] To further reduce the cost of solar cells and improve their efficiency, cheaper metals such as nickel and copper are being used to partially or completely replace silver to achieve cost reduction. The possibility of mass production of metal electrodes for solar cells has also been explored.

[0004] Some leading research institutions and scholars have tried to use copper paste to replace silver paste. However, copper paste is easily oxidized during the sintering process to form copper grid lines, which affects battery efficiency. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a new type of battery cell intermediate, sintering protection carrier and belt conveyor.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] The first aspect of this utility model provides a battery cell intermediate, including a battery cell substrate and a gas barrier film. The battery cell substrate includes a substrate and copper grid lines disposed on the substrate. The gas barrier film covers and adheres to the copper grid lines to isolate the copper grid lines from external oxygen or air.

[0008] In one embodiment, the substrate is arranged in a sheet shape, having an upper side portion disposed on the top, a lower side portion disposed on the bottom, a left side portion disposed on the left, a right side portion disposed on the right, a front side portion disposed on the front, and a rear side portion disposed on the rear, wherein the gas barrier film is attached to the upper side portion and / or the lower side portion.

[0009] And / or, the size of the gas barrier film is larger than the size of the battery cell substrate, such that the edge of the gas barrier film extends beyond the edge of the battery cell substrate;

[0010] And / or, the temperature resistance of the gas barrier membrane is 200 degrees or higher.

[0011] In one embodiment, the material of the gas barrier membrane includes inorganic materials or polymer materials;

[0012] The inorganic material includes silicon oxide, aluminum oxide, silicon nitride, or aluminum nitride, and the polymer material includes polyethylene or polypropylene;

[0013] The gas barrier membrane has a multi-layer structure, which is formed by at least two of the following: a polymer material layer, a wood fiber layer, and an inorganic material layer.

[0014] The second aspect of this utility model provides a sintering protection carrier, the sintering protection carrier including a protective frame, the protective frame having a hollow receiving cavity for receiving a battery cell substrate or a battery cell intermediate, the receiving cavity being formed by the sidewalls of the protective frame, and a gas barrier membrane being provided on a portion of the sidewalls of the protective frame or a portion of the sidewalls of the protective frame being made of a gas barrier membrane.

[0015] In one embodiment, the gas barrier film at least covers and adheres to the copper grid lines of the battery cell substrate to isolate the copper grid lines from oxygen or air;

[0016] Alternatively, the gas barrier film covers and adheres to the surface of the battery cell substrate where the copper grid lines are located, and the size of the gas barrier film is larger than the size of the battery cell substrate, so that the edge of the gas barrier film extends beyond the edge of the battery cell substrate.

[0017] Alternatively, the gas barrier film covers and adheres to the surface of the intermediate body of the battery cell where the copper grid lines are disposed, and the size of the gas barrier film is larger than the size of the intermediate body of the battery cell, so that the edge of the gas barrier film extends beyond the edge of the intermediate body of the battery cell.

[0018] In one embodiment, the protective frame sidewall includes an upper sidewall, a lower sidewall, a left sidewall, a right sidewall, a front sidewall, and a rear sidewall, wherein the upper sidewall and / or the lower sidewall is an air-barrier membrane;

[0019] The gas barrier film covers and adheres to the surface of the battery cell substrate where the copper grid lines are located. The size of the gas barrier film is larger than the size of the battery cell substrate, so that the edge of the gas barrier film extends out of the edge of the battery cell substrate and overlaps the edge of the protective frame.

[0020] Alternatively, the gas barrier film covers and adheres to the surface of the battery cell intermediate where the copper grid lines are located, and the size of the gas barrier film is larger than the size of the battery cell intermediate, so that the edge of the gas barrier film extends out of the edge of the battery cell intermediate and overlaps the edge of the protective frame.

[0021] The third aspect of this utility model provides a belt conveyor device, which includes a conveyor belt body. An air barrier film is disposed on the surface of the conveyor belt body, or the conveyor belt body is made of an air barrier film. In use, the air barrier film covers and adheres to the copper grid lines of the battery cell substrate to isolate the copper grid lines from oxygen or air.

[0022] In one embodiment, the conveyor belt body includes an upper conveyor belt body and a lower conveyor belt body, and the air barrier membrane is disposed at the lower part of the upper conveyor belt body and / or the upper part of the lower conveyor belt body.

[0023] The upper conveyor belt body and the lower conveyor belt body move synchronously, and the upper conveyor belt body and the lower conveyor belt body abut against both sides of the battery cell substrate at the same time, so that one or both sides of the battery cell substrate are covered and adhered by the gas barrier film.

[0024] In one embodiment, the upper conveyor belt body and the lower conveyor belt body can approach each other so that the upper conveyor belt body and the lower conveyor belt body simultaneously abut against both sides of the battery cell substrate, forming a conveying channel that clamps the battery cell substrate.

[0025] In one embodiment, the belt conveyor further includes a heating device and an insulation box, the conveyor belt body passing through the insulation box to transport the battery cell substrate through the insulation box;

[0026] The heating device can be an electric heater or an eddy current heater, which can heat the battery cell substrate passing through the insulation box.

[0027] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0028] The battery cell intermediate, sintering protective carrier and belt conveyor of this utility model, by setting a gas barrier film, can cover and adhere to the substrate with copper grid lines, avoiding the problem of easy oxidation of copper grid lines during the sintering process, and improving the qualification rate of the finished battery cell. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the battery cell substrate in Embodiment 1 of this utility model;

[0030] Figure 2 This is a schematic diagram of the first structure of the battery cell intermediate in Embodiment 1 of this utility model;

[0031] Figure 3 This is a schematic diagram of the second structure of the battery cell intermediate in Embodiment 1 of this utility model;

[0032] Figure 4This is a schematic diagram of the first structure of the sintering protective carrier in Embodiment 2 of this utility model;

[0033] Figure 5 This is a schematic diagram of the second structure of the sintering protective carrier in Embodiment 2 of this utility model;

[0034] Figure 6 This is a top view schematic diagram of the second structure of the sintering protective carrier in Embodiment 2 of this utility model;

[0035] Figure 7 This is a schematic diagram of the first structure of the belt conveyor in Embodiment 3 of this utility model;

[0036] Figure 8 This is a schematic diagram of the second structure of the belt conveyor in Embodiment 3 of this utility model.

[0037] Figure 9 This is a schematic diagram of the third structure of the belt conveyor in Embodiment 3 of this utility model;

[0038] The attached icon is labeled as follows:

[0039] 1-Battery cell substrate; 10-Battery cell intermediate; 11-Upper side; 12-Lower side; 13-Left side; 14-Right side; 15-Substrate; 16-Copper grid line; 2-Gas barrier film; 31-Upper sidewall; 32-Lower sidewall; 33-Left sidewall; 34-Right sidewall; 35-Receiving cavity; 4-Conveyor belt body; 41-Upper conveyor belt body; 42-Lower conveyor belt body; 5-Heating device; 6-Insulation box. Detailed Implementation

[0040] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is intended to aid in understanding the present invention, but does not constitute a limitation thereof.

[0041] Example 1

[0042] See Figure 1-3As shown, the intermediate cell 10 in this embodiment is an intermediate product in the production process of solar cells. The intermediate cell 10 includes a cell substrate 1 and a gas barrier film 2. The cell substrate 1 includes a substrate 15 and copper grid lines 16 disposed on the substrate 15. The gas barrier film 2 covers and adheres to the copper grid lines 16 to isolate the copper grid lines 16 from external oxygen or air. The substrate 15 is sheet-shaped and has an upper side portion 11 on the top, a lower side portion 12 on the bottom, a left side portion 13 on the left, a right side portion 14 on the right, a front side portion (not shown in the figure) on the front, and a rear side portion (not shown in the figure) on the rear. Conductive copper paste is screen-printed to form incompletely cured copper grid lines 16 on the upper side portion 11 and the lower side portion 12. In other embodiments, the copper grid lines 16 can also be disposed on the substrate 15 by other methods. The gas barrier film 2 is attached to the upper side portion 11 and the lower side portion 12. In other embodiments, the copper grid lines 16 can be disposed only on the upper side portion 11 or only on the lower side portion 12, and the gas barrier film 2 can be attached to the upper side portion 11 or the lower side portion 12 where the copper grid lines 16 are disposed.

[0043] The gas barrier membrane 2 has a temperature tolerance of 200 degrees Celsius and above. Specifically, the material of the gas barrier membrane 2 includes inorganic materials or polymer materials; the inorganic materials include silicon oxide, aluminum oxide, silicon nitride, or aluminum nitride, and the polymer materials include polyethylene or polypropylene; the gas barrier membrane 2 has a multilayer structure, consisting of at least two layers selected from a polymer material layer, a wood fiber layer, and an inorganic material layer. For example, the gas barrier membrane 2 is a polyethylene film, or the gas barrier membrane 2 includes a wood fiber layer and a polyethylene layer covering one or both sides of the wood fiber layer.

[0044] The size of the gas barrier film 2 is larger than the size of the battery cell substrate 1, so that the edge of the gas barrier film 2 extends beyond the edge of the battery cell substrate 1. After the copper grid lines 16 on the substrate 15 are cured, the gas barrier film 2 can be peeled off from the part of the gas barrier film 2 that extends beyond the edge of the battery cell substrate 1, so as to facilitate the separation of the gas barrier film 2 and the battery cell substrate 1.

[0045] To ensure that the incompletely cured copper grid lines 16 are fully cured and better bonded to the substrate 11, the intermediate body 10 of the solar cell can be sintered, that is, the solar cell substrate 1 containing the gas barrier film 2 can be sintered. The sintering temperature can be 200-350 degrees. Since the gas barrier film 2 is provided to cover and protect the copper grid lines 16, the oxidation of the copper grid lines 16 during the sintering process is prevented, thereby improving the yield of the finished solar cell.

[0046] It should be noted that sintering refers to curing the incompletely cured copper grid lines 16, including heating and curing the incompletely cured copper grid lines 16 with an electric heater or an eddy current heater, or photocuring the incompletely cured copper grid lines 16.

[0047] It should be noted that when the copper grid lines 16 are simultaneously disposed on both the upper side 11 and the lower side 12 of the substrate 15, it is used as the substrate 1 for forming a bifacial solar cell; when the copper grid lines 16 are disposed only on either the upper side 11 or the lower side 12 of the substrate 15, it is used as the substrate 1 for forming a unifacial solar cell. The unifacial solar cell can be a BSF (Aluminum Back Surface Field), PERC (Passivated Emitter and Rear Cell), HJT (Heterojunction with Intrinsic Thin Layer), PSC (Perovskite Solar Cells), or IBC (Interdigitated Back Contact), etc. The bifacial solar cell can be an HJT, Topcon (Tunnel Oxide Passivating Contacts), or PSC, etc.

[0048] Example 2

[0049] See Figure 4-6 As shown, the sintering protective carrier in this embodiment includes a protective frame. The protective frame is generally rectangular and has a hollow receiving cavity 35, which is formed by the side walls of the protective frame. Figure 4 As shown, the protective frame sidewalls specifically include an upper sidewall 31, a lower sidewall 32, a left sidewall 33, a right sidewall 34, a front sidewall 35, and a rear sidewall 36. The battery cell substrate 1 includes a substrate 15 and copper grid lines 16 disposed on the substrate 15. During operation, the battery cell substrate 1 is located in the receiving cavity 35. The receiving cavity 35 can isolate oxygen or air and allows heat or a magnetic field to pass through, so that the copper grid lines 16 disposed on the substrate 15 can be dried, while reducing the risk of oxidation. In a preferred embodiment, before the battery cell substrate 1 is placed into the receiving cavity 35, a gas barrier film 2 can be provided on the upper side 11 and / or the lower side 12 of the battery cell substrate 1 (which can be understood as forming the battery cell intermediate 10 in Embodiment 1) to initially isolate the copper grid lines 16 on the upper side 11 and / or the lower side 12 from external oxygen or air, and then the battery cell substrate 1 is placed into the receiving cavity 35 for secondary isolation of oxygen or air outside the receiving cavity 35. In a preferred embodiment, at least the upper sidewall 31 and / or the lower sidewall 32 are provided with a gas barrier membrane 2, which abuts against the upper side portion 11 and / or the lower side portion 12 of the battery cell substrate 1, so as to isolate the copper grid lines 16 on the upper side portion 11 and / or the lower side portion 12 from external oxygen or air.

[0050] The gas barrier membrane 2 has a temperature tolerance of 200 degrees Celsius or higher. Specifically, the material of the gas barrier membrane 2 includes inorganic materials or polymer materials; the inorganic materials include silicon oxide, aluminum oxide, silicon nitride, or aluminum nitride, and the polymer materials include polyethylene or polypropylene; the gas barrier membrane 2 has a multilayer structure, consisting of at least two layers selected from a polymer material layer, a wood fiber layer, and an inorganic material layer. For example, the gas barrier membrane 2 is a polyethylene film, or it includes a wood fiber layer and a polyethylene layer covering one or both sides of the wood fiber layer.

[0051] In some embodiments, such as Figure 5-6 As shown, the protective frame sidewalls specifically include a left sidewall 33, a right sidewall 34, a front sidewall 35, and a rear sidewall 36. The upper sidewall 31 and lower sidewall 32 are replaced with a gas barrier film 2 to allow heat or magnetic fields to pass through. The gas barrier film 2 can be peeled off and replaced directly after it becomes dirty. During operation, the battery substrate 1 is located in the receiving cavity 35, which isolates oxygen or air. The gas barrier film 2 allows heat or magnetic fields to pass through, facilitating the drying of the copper grid lines 16. Preferably, the gas barrier film 2 covers and adheres to the surface of the battery substrate 1 where the copper grid lines are located. The size of the gas barrier film 2 is larger than the size of the battery substrate 1, so that the edge of the gas barrier film 2 extends beyond the edge of the battery substrate 1 and overlaps the edge of the protective frame. That is, the edge of the gas barrier film 2 overlaps at least one of the left sidewall 33, right sidewall 34, front sidewall 35, and rear sidewall 36. Preferably, positioning protrusions are provided on the left side wall 33 and the right side wall 34. The left and right edges of the gas barrier film 2 overlap the left side wall 33 and the right side wall 34, respectively, and positioning holes that mate with the positioning protrusions are respectively provided on the left and right edges of the gas barrier film 2. During operation, the positioning holes fit into the positioning protrusions, which enables the gas barrier film 2 and the battery substrate 1 in the receiving cavity 35 to be aligned, thereby allowing the gas barrier film 2 to be tightly attached to the side of the battery substrate 1 where the copper grid lines are located.

[0052] Example 3

[0053] See Figure 7-9As shown, the belt conveyor in this embodiment includes a conveyor belt body 4 and a heating device 5 disposed below the conveyor belt body 4. Specifically, a rotating shaft can be driven by a motor to rotate, and the rotating shaft drives the conveyor belt body 4 to move. The battery substrate 1 includes a substrate 15 and copper grid lines 16 disposed on the lower side 12 of the substrate 15. A gas barrier film 2 is disposed on the surface of the conveyor belt body 4, or the conveyor belt body 4 is made of a gas barrier film 2. When the battery substrate 1 is placed on the conveyor belt body 4, the gas barrier film 2 is used to cover and adhere the copper grid lines 16 of the battery substrate 1. The heating device 5 is specifically used for heating the battery substrate 1 during the sintering process. Preferably, the belt conveyor also includes a heat preservation box 6, through which the conveyor belt body 4 passes, and the battery substrate 1 is sintered in the heat preservation box 6, so that the sintering temperature of the battery substrate 1 can be kept stable.

[0054] The gas barrier membrane 2 has a temperature tolerance of 200 degrees Celsius or higher. Specifically, the material of the gas barrier membrane 2 includes inorganic materials or polymer materials; the inorganic materials include silicon oxide, aluminum oxide, silicon nitride, or aluminum nitride, and the polymer materials include polyethylene or polypropylene; the gas barrier membrane 2 has a multilayer structure, consisting of at least two layers selected from a polymer material layer, a wood fiber layer, and an inorganic material layer. For example, the gas barrier membrane 2 is a polyethylene film, or it includes a wood fiber layer and a polyethylene layer covering one or both sides of the wood fiber layer.

[0055] Specifically, the heating device 5 can be an electric heater, a drying device, a vortex heater, or a photocuring device. The electric heater heats the air surrounding the battery substrate 1 to cure the copper grid lines 16; the drying device provides hot air to the area surrounding the battery substrate 1 to cure the copper grid lines 16. Therefore, when using an electric heater or a drying device to cure the copper grid lines 16, an insulated chamber 6 is generally required to improve the curing effect and reduce energy consumption, thereby reducing heat loss and drying efficiency. The vortex heater or photocuring device acts directly on the copper grid lines 16, resulting in minimal heat loss; therefore, when using an vortex heater or photocuring device to cure the copper grid lines 16, an insulated chamber 6 is not required.

[0056] In some implementations, see Figure 8As shown, gas barrier membranes 2 are spaced apart on the conveyor belt body 4. During operation, the battery cell substrate 1 is placed on the gas barrier membrane 2, with the side of the battery cell substrate 1 having the copper grid lines 16 attached to the gas barrier membrane 2. Preferably, the gas barrier membranes 2 are evenly spaced on the conveyor belt body 4, and the conveyor belt body 4 moves at a uniform speed. A loading robot is installed upstream of the conveyor belt body 4 to load the battery cell substrate 1. To facilitate accurate loading, the loading robot is equipped with a vision sensor that can identify the position of the gas barrier membranes 2 on the conveyor belt body 4, thereby accurately placing the battery cell substrate 1 on the gas barrier membranes 2 on the conveyor belt body 4. A unloading robot is installed downstream of the conveyor belt body 4 to unload the battery cell substrate 1. To facilitate accurate unloading, the unloading robot is equipped with a vision sensor that can identify the battery cell substrate 1 on the conveyor belt body 4, thereby unloading the battery cell substrate 1 from the conveyor belt body 4.

[0057] In some implementations, see Figure 9 As shown, the conveyor belt body 4 includes an upper conveyor belt body 41 and a lower conveyor belt body 42. The gas barrier membrane 2 is disposed on the upper part of the lower conveyor belt body 42, or the lower conveyor belt body 42 is made of the gas barrier membrane 2. The upper conveyor belt body 41 and the lower conveyor belt body 42 move synchronously, and simultaneously abut against both sides of the battery cell substrate 1, so that the lower surface of the battery cell substrate 1 is covered and adhered to by the gas barrier membrane 2. The upper conveyor belt body 41 is used to press the battery cell substrate 1, so that the lower surface of the battery cell substrate 1 and the gas barrier membrane 2 can be tightly adhered, reducing the risk of air leakage. Preferably, the upper conveyor belt body 41 and the lower conveyor belt body 42 can approach each other, so that the upper conveyor belt body 41 and the lower conveyor belt body 42 simultaneously abut against both sides of the battery cell substrate 1, forming a conveying channel for clamping the battery cell substrate 1. Specifically, the upper conveyor belt body 41 is connected to a lifting drive device, which can drive the upper conveyor belt body 41 to move up and down, so that the upper conveyor belt body 41 and the lower conveyor belt body 42 simultaneously abut against both sides of the battery cell substrate 1. The lifting drive device can be a linear motor or a cylinder.

[0058] The belt conveyor in this embodiment can also be used to convey the intermediate battery cell 10 in Embodiment 1. Further, after the aforementioned unloading robot unloads the intermediate battery cell 10 from the conveyor belt body 4, it transfers it to the adsorption platform. The adsorption platform adsorbs the intermediate battery cell 10, and the film-tearing robot tears off the gas barrier film 2 from the battery cell substrate 1. The gas barrier film 2 is larger than the size of the battery cell substrate 1, so that the edge of the gas barrier film 2 extends beyond the edge of the battery cell substrate 1. The grippers on the film-tearing robot hold the gas barrier film 2 extending beyond the edge of the battery cell substrate 1, enabling the gas barrier film 2 to be quickly torn off the battery cell substrate 1 without contacting it, thus reducing the risk of damaging the battery cell substrate 1.

[0059] Example 4

[0060] See Figure 9 As shown, the main difference between this embodiment and Embodiment 3 is that in this embodiment, the belt conveyor includes an upper conveyor belt body 41 and a lower conveyor belt body 42. An air-barrier membrane 2 is disposed at the lower part of the upper conveyor belt body 41 and the upper part of the lower conveyor belt body 42, or both the upper conveyor belt body 41 and the lower conveyor belt body 42 are made of the air-barrier membrane 2. During the transport of the battery substrate 1, the upper conveyor belt body 41 and the lower conveyor belt body 42 correspondingly abut against the upper side 11 and the lower side 12 of the battery substrate 1 to isolate the copper grid lines 16 on the upper side 11 and the lower side 12 from external oxygen or air. This embodiment is particularly suitable for conveying a battery cell substrate 1 with copper grid lines 16 on both sides (upper side 11 and lower side 12). During conveying, the entire battery cell substrate 1 or the copper grid lines 16 are heated to solidify the copper grid lines 16. The upper conveyor belt body 41 and the lower conveyor belt body 42 cover and adhere both sides of the battery cell substrate 1 to isolate the copper grid lines 16 from external oxygen or air. This embodiment can also be used for conveying battery cell substrates 1 with copper grid lines 16 on only one side. For details not described in this embodiment, please refer to Embodiment 3.

[0061] In the description of this utility model, the directions such as "front," "back," "left," "right," "up," and "down" are defined with reference to the direction observed by the user, i.e., as shown below. Figure 1 As shown in the figure, the left side is "left", the right side is "right", the top side is "up", the bottom side is "down", and the direction perpendicular to the viewpoint is "forward" and "backward". The above definitions of directions are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0062] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A battery cell intermediate, characterized in that: The device includes a battery cell substrate and a gas barrier film. The battery cell substrate includes a substrate and copper grid lines disposed on the substrate. The gas barrier film covers and adheres to the copper grid lines to isolate the copper grid lines from external oxygen or air.

2. The battery cell intermediate according to claim 1, characterized in that: The substrate is in the form of a sheet, having an upper side portion disposed on the top, a lower side portion disposed on the bottom, a left side portion disposed on the left, a right side portion disposed on the right, a front side portion disposed on the front, and a rear side portion disposed on the rear, wherein the gas barrier film is attached to the upper side portion and / or the lower side portion. And / or, the size of the gas barrier film is larger than the size of the battery cell substrate, such that the edge of the gas barrier film extends beyond the edge of the battery cell substrate; And / or, the temperature resistance of the gas barrier membrane is 200 degrees or higher.

3. The battery cell intermediate according to claim 1, characterized in that: The material of the gas barrier membrane includes inorganic materials or polymer materials; The inorganic material includes silicon oxide, aluminum oxide, silicon nitride, or aluminum nitride, and the polymer material includes polyethylene or polypropylene; The gas barrier membrane has a multi-layer structure, which is formed by at least two of the following: a polymer material layer, a wood fiber layer, and an inorganic material layer.

4. A sintering protective carrier, characterized in that: The sintering protective carrier includes a protective frame with a hollow receiving cavity for accommodating a battery cell substrate or a battery cell intermediate. The receiving cavity is formed by the sidewalls of the protective frame, and a gas barrier film is provided on a portion of the sidewalls of the protective frame or the sidewalls of the protective frame are made of a gas barrier film.

5. The sintering protective carrier according to claim 4, characterized in that: The gas barrier film at least covers and adheres to the copper grid lines of the battery cell substrate to isolate the copper grid lines from oxygen or air; Alternatively, the gas barrier film covers and adheres to the surface of the battery cell substrate where the copper grid lines are located, and the size of the gas barrier film is larger than the size of the battery cell substrate, so that the edge of the gas barrier film extends beyond the edge of the battery cell substrate. Alternatively, the gas barrier film covers and adheres to the surface of the intermediate body of the battery cell where the copper grid lines are disposed, and the size of the gas barrier film is larger than the size of the intermediate body of the battery cell, so that the edge of the gas barrier film extends beyond the edge of the intermediate body of the battery cell.

6. The sintering protective carrier according to claim 4, characterized in that: The protective frame sidewalls include an upper sidewall, a lower sidewall, a left sidewall, a right sidewall, a front sidewall, and a rear sidewall, wherein the upper sidewall and / or the lower sidewall is an air-barrier membrane; The gas barrier film covers and adheres to the surface of the battery cell substrate where the copper grid lines are located. The size of the gas barrier film is larger than the size of the battery cell substrate, so that the edge of the gas barrier film extends out of the edge of the battery cell substrate and overlaps the edge of the protective frame. Alternatively, the gas barrier film covers and adheres to the surface of the battery cell intermediate where the copper grid lines are located, and the size of the gas barrier film is larger than the size of the battery cell intermediate, so that the edge of the gas barrier film extends out of the edge of the battery cell intermediate and overlaps the edge of the protective frame.

7. A belt conveyor device, characterized in that: The belt conveyor includes a conveyor belt body, on the surface of which a gas barrier film is provided, or the conveyor belt body is made of a gas barrier film. In use, the gas barrier film covers and adheres to the copper grid lines of the battery cell substrate to isolate the copper grid lines from oxygen or air.

8. The belt conveyor according to claim 7, characterized in that: The conveyor belt body includes an upper conveyor belt body and a lower conveyor belt body, and the air barrier membrane is disposed at the lower part of the upper conveyor belt body and / or the upper part of the lower conveyor belt body. The upper conveyor belt body and the lower conveyor belt body move synchronously, and the upper conveyor belt body and the lower conveyor belt body abut against both sides of the battery cell substrate at the same time, so that one or both sides of the battery cell substrate are covered and adhered by the gas barrier film.

9. The belt conveyor according to claim 8, characterized in that: The upper conveyor belt body and the lower conveyor belt body can approach each other so that the upper conveyor belt body and the lower conveyor belt body simultaneously abut against both sides of the battery cell substrate, forming a conveying channel that clamps the battery cell substrate.

10. The belt conveyor according to claim 7, characterized in that: The belt conveyor also includes a heating device and an insulation box. The conveyor belt body passes through the insulation box to transport the battery cell substrate through the insulation box. The heating device can be an electric heater or an eddy current heater, which can heat the battery cell substrate passing through the insulation box.

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