Packaging frame and photovoltaic modules

Abstract

The utility model discloses a packaging frame and a photovoltaic assembly. The packaging frame includes a first frame and a second frame, the first frame includes a first main body, a first abutment member and a first stopper, one side of the first abutment member is connected to the outer surface of one side wall of the first main body, the first stopper member is connected to an end of the first abutment member away from the first main body, and the first stopper member, the first abutment member and the side wall of the first main body form a first installation groove for installing a solar cell; the second frame includes a second main body, a second abutment member and a second stopper member, one side of the second abutment member is connected to the outer surface of one side wall of the second main body, the second stopper member is connected to an end of the second abutment member away from the second main body, and the second stopper member, the second abutment member and the side wall of the second main body form a second installation groove for installing a solar cell; the width of the first stopper member is smaller than the width of the second stopper member. The present application can be compatible with large-size batteries.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a packaging frame and a photovoltaic component. Background Art

[0002] In the photovoltaic field, the application of large-size cells in photovoltaic modules has brought significant advantages to the photovoltaic industry by improving production efficiency, reducing costs and increasing power generation. These advantages make large-size cells one of the important directions for the development of current photovoltaic technology. With the development of the photovoltaic module market, the demand for high-efficiency modules is becoming more and more vigorous. The more cells there are in a photovoltaic module and the larger the size is, the more it will be affected by factors such as production equipment, packaging and transportation, and safety during production, so that the size of the photovoltaic module cannot be increased indefinitely. This makes it one of the key means to improve efficiency by making full use of the gap reflection between the cells to increase the power of the photovoltaic module. However, the size of the photovoltaic module, the size of the cell, and the width of the top surface of the frame limit the range of the cell spacing. In traditional technology, frames of different lengths are basically the same in size except for the length. After the solar cells are encapsulated in the frame, there is a bus bar interconnection at the end of the battery string at the short side width position. The creepage distance is the distance from the bus bar to the edge of the short side of the glass. Therefore, the top surface width of the short frame will basically not cover the battery cell, and the creepage distance at the long frame position is the distance between the battery string and the edge of the long side of the glass. Under the condition of meeting the creepage distance and the distance between the battery cell and the top surface of the long frame, the string spacing will be compressed smaller as the battery cell size increases.

[0003] In the prior art, in order to improve the efficiency of photovoltaic module cells, there are the following methods: one is asymmetric frame design, which mainly focuses on the long frame, short frame cross-section and C-plane width, but the process redundancy of this method is low, and factors such as cell string spacing and gap reflection are not fully considered, which affects the module yield. The other is gap reflection optimization, which improves light reflection by glazing or filming, thereby improving the solar cell's light absorption efficiency and increasing power, but it also increases the manufacturing cost accordingly. Utility Model Content

[0004] Based on this, it is necessary to provide a packaging frame. The packaging frame of the utility model can achieve compatibility with large-size batteries and large battery string spacing, maximize the use of gap reflection, thereby improving the power and yield of the component, and the cost is low.

[0005] An embodiment of the present application provides a packaging frame.

[0006] A packaging frame includes a first frame and a second frame, wherein the first frame is used to package the longer edge of a solar cell, and the second frame is used to package the shorter edge of a solar cell. The first frame includes a first main body, a first abutment member, and a first limiting member. The first frame has a first angle code cavity for embedding and connecting an angle code, one side of the first abutment member is connected to the outer surface of one side wall of the first main body, the first limiting member is connected to an end of the first abutment member away from the first main body, and a first installation groove for installing a solar cell is formed between the first limiting member, the first abutment member, and the side wall of the first main body; the second frame includes a second main body, a second abutment member, and a second limiting member. The second frame has a second angle code cavity for embedding and connecting an angle code, one side of the second abutment member is connected to the outer surface of one side wall of the second main body, the second limiting member is connected to an end of the second abutment member away from the second main body, and a second installation groove for installing a solar cell is formed between the second limiting member, the second abutment member, and the side wall of the second main body; the width of the first limiting member is smaller than the width of the second limiting member.

[0007] In some embodiments, the outer surface of the side wall of the first body located in the first mounting groove forms a first bearing surface, and the first bearing surface is used to support a portion of the back side of the solar cell;

[0008] And / or, the outer surface of the side wall of the second main body located in the second installation groove forms a second bearing surface, and the second bearing surface is used to support a portion of the back side of the solar cell.

[0009] In some embodiments, the first bearing surface is gradually inclined inward at an angle of 3° to 7° from a side away from the first abutment member to a side adjacent to the first abutment member;

[0010] And / or, the second bearing surface is gradually inclined inward at an angle of 3° to 7° from a side away from the second abutting member to a side adjacent to the second abutting member.

[0011] In some embodiments, the inner surface of the first stopper facing the first installation groove has a first glue overflow groove, and the first glue overflow groove is used to accommodate the connecting component;

[0012] And / or, the inner surface of the second limiting member facing the second installation groove has a second glue overflow groove, and the second glue overflow groove is used to accommodate the connecting component.

[0013] In some embodiments, at least a portion of the outer surface of the first stopper away from the first mounting groove is curved;

[0014] And / or, at least a portion of the outer surface of the second limiting member away from the second installation groove is curved.

[0015] In some embodiments, the first body is a hollow quadrangular prism structure, and the first abutment member is connected to one of the side walls;

[0016] And / or, the second main body is a hollow quadrangular prism structure, and the second abutment member is connected to one of the side walls.

[0017] In some embodiments, at least one inner wall of the first body is connected to a plurality of reinforcing ribs;

[0018] And / or, at least one inner wall of the second body is connected with a plurality of reinforcing ribs.

[0019] In some embodiments, a first support plate is further connected to the first body, and the first support plate and the first abutment member are respectively located on two opposite sides of the first body;

[0020] The second main body is also connected to a second support plate, and the second support plate and the second abutment member are respectively located on two opposite sides of the second main body;

[0021] The width of the first support plate is greater than the width of the second support plate.

[0022] An embodiment of the present application also provides a photovoltaic module.

[0023] A photovoltaic assembly comprises a solar cell and a packaging frame, wherein the first frame packages the longer edge of the solar cell, the second frame packages the shorter edge of the solar cell, and the end of the first frame is connected to the end of the second frame through an angle code.

[0024] In some embodiments, the end face of the first frame and the end face of the second frame are respectively wedge-shaped inclined surfaces, and the first frame and the second frame are vertically arranged, wherein the angle between the end face of the first frame and its length direction is 25° to 40°, the angle between the end face of the second frame and its length direction is 50° to 65°, and the sum of the two angles is 90°.

[0025] The above-mentioned packaging frame can achieve compatibility with large-size batteries and large battery string spacing, maximize the use of gap reflection, thereby improving the power and yield of the component at a low cost.

[0026] Compared with the traditional technology, the packaging frame of the present application has the following beneficial effects:

[0027] (1) By optimizing gap reflection and battery string spacing, the power of the module is significantly improved, with higher module power and efficiency.

[0028] (2) The present application increases the battery string spacing and compatibility with large-size batteries, providing greater flexibility for process control and better process control capabilities.

[0029] (3) The present application has better compatibility and can enable photovoltaic modules of the same size to be compatible with larger-sized cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0031] In order to more completely understand the present application and its beneficial effects, the following description will be made in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0032] Figure 1 This is a schematic diagram of a first frame of a packaging frame according to an embodiment of the utility model;

[0033] Figure 2 A schematic diagram of a second frame of a packaging frame according to an embodiment of the utility model;

[0034] Figure 3 This is a schematic diagram of the cooperation between the first frame and the second frame of an embodiment of the utility model;

[0035] Figure 4 This is a schematic diagram of a packaging frame and a battery string packaging according to an embodiment of the utility model.

[0036] Description of Reference Numerals

[0037] 10. Packaging frame; 100. First frame; 110. First main body; 111. First corner code cavity; 112. First bearing surface; 120. First abutment member; 130. First position limiting member; 131. First glue overflow groove; 140. First mounting groove; 150. First support plate; 200. Second frame; 210. Second main body; 211. Second corner code cavity; 212. Second bearing surface; 220. Second abutment member; 230. Second position limiting member; 231. Second glue overflow groove; 240. Second mounting groove; 250. Second support plate; 300. Reinforcement rib; 20. Battery string. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0044] The embodiment of the present application provides a packaging frame 10 to solve the problem that the long frame and the short frame of the photovoltaic module in the traditional technology cannot be adapted to different sizes, especially large-sized cells. The packaging frame 10 will be described below in conjunction with the accompanying drawings.

[0045] The packaging frame 10 provided in the embodiment of the present application is exemplary, see Figure 1 As shown, Figure 1 The schematic diagram of the structure of the packaging frame 10 provided in the embodiment of the present application is as follows. The packaging frame 10 of the present application can be used for packaging large-sized solar cells.

[0046] In order to more clearly illustrate the structure of the packaging frame 10, the packaging frame 10 will be introduced in conjunction with the accompanying drawings. Figure 1 As shown, Figure 1 A schematic diagram of the structure of the packaging frame 10 provided in an embodiment of the present application.

[0047] A packaging frame 10 includes a first frame 100 and a second frame 200. The first frame 100 is used to package the longer edge of a solar cell, and the second frame 200 is used to package the shorter edge of a solar cell.

[0048] The first frame 100 includes a first main body 110, a first abutment member 120 and a first stopper 130. The first frame 100 has a first corner code cavity 111 for the corner code to be embedded and connected. One side of the first abutment member 120 is connected to the outer surface of one side wall of the first main body 110. The first stopper 130 is connected to an end of the first abutment member 120 away from the first main body 110. The first stopper 130, the first abutment member 120 and the side wall of the first main body 110 form a first installation groove 140 for installing a solar cell.

[0049] The second frame 200 includes a second main body 210, a second abutment member 220 and a second limiting member 230. The second frame 200 has a second corner code cavity 211 for the corner code to be embedded and connected. One side of the second abutment member 220 is connected to the outer surface of one side wall of the second main body 210. The second limiting member 230 is connected to an end of the second abutment member 220 away from the second main body 210. The second limiting member 230, the second abutment member 220 and the side wall of the second main body 210 form a second mounting groove 240 for mounting solar cells. The width of the first limiting member 130 is smaller than the width of the second limiting member 230. It should be noted that in the present application, the length of the first frame 100 is greater than the length of the second frame 200.

[0050] The above-mentioned packaging frame 10 can achieve compatibility with large-size batteries and large battery string 20 spacing, maximize the use of gap reflection, thereby improving the power and yield of the component at a low cost. Specifically, the present application sets the width of the first limiter 130 of the first frame 100 to be smaller than the width of the second limiter 230 of the second frame 200. After the frame encapsulates the solar cell, the second frame 200 encapsulates the short side position of the solar cell. There is a bus bar interconnection at the tail of the battery string 20 at this position, and the creepage distance is the distance from the bus bar to the edge. Therefore, the width of the second limiter 230 of the short frame will not directly affect the battery cell. The longer first frame 100 encapsulates the long side position of the solar cell. When the solar cell with the above-mentioned encapsulation frame 10 is used, after the width W1 of the first limiter 130 is shortened, the lateral distance between the first limiters 130 of the two parallel first frames 100 is increased, which can be compatible with large-size battery cells or the spacing between the battery strings 20 can be increased. If large-size battery cells are used, the component power can be improved. If the spacing between the battery strings 20 is increased, the gap can reflect more light to improve the component power, and at the same time, the process control window is increased to improve the yield. After the width W2 of the second limiting member 230 is widened, the strength of the second frame 200 is enhanced, thereby compensating for the decrease in load performance caused by the reduction in the width of the first limiting member 130 of the first frame 100 .

[0051] In some embodiments, the outer surface of the side wall of the first body 110 located in the first installation groove 140 forms a first bearing surface 112 , and the first bearing surface 112 is used to support a portion of the back surface of the solar cell.

[0052] In some embodiments, the outer surface of the side wall of the second body 210 located in the second mounting groove 240 forms a second bearing surface 212 , and the second bearing surface 212 is used to support a portion of the back surface of the solar cell.

[0053] In some embodiments, the first bearing surface 112 is gradually inclined inward at an angle of 3° to 7° from a side away from the first abutting member 120 to a side adjacent to the first abutting member 120 .

[0054] In some embodiments, the second bearing surface 212 is gradually inclined inward at an angle of 3° to 7° from a side away from the second abutting member 220 to a side adjacent to the second abutting member 220 .

[0055] In some embodiments, the first limiting member 130 has a first glue overflow groove 131 on its inner surface facing the first installation groove 140 . The first glue overflow groove 131 is used to accommodate the connecting component.

[0056] In some embodiments, the second limiting member 230 has a second glue overflow groove 231 on its inner surface facing the second installation groove 240 , and the second glue overflow groove 231 is used to accommodate the connecting component.

[0057] In some embodiments, at least a portion of the outer surface of the first limiting member 130 away from the first installation slot 140 is in a curved shape.

[0058] In some embodiments, at least a portion of the outer surface of the second limiting member 230 away from the second installation slot 240 is curved.

[0059] In some embodiments, the first body 110 is a hollow quadrangular prism structure, and the first abutting member 120 is connected to one of the side walls.

[0060] In some embodiments, the second body 210 is a hollow quadrangular prism structure, and the second abutting member 220 is connected to one of the side walls.

[0061] In some of the embodiments, a plurality of reinforcing ribs 300 are connected to at least one inner wall of the first body 110 .

[0062] In some of the embodiments, a plurality of reinforcing ribs 300 are connected to at least one inner wall of the second body 210 .

[0063] In some embodiments, the first body 110 is further connected to a first support plate 150, the first support plate 150 and the first abutment member 120 are respectively located on two opposite sides of the first body 110, and the first support plate 150 can increase the strength of the first frame 100; the second body 210 is further connected to a second support plate 250, the second support plate 250 and the second abutment member 220 are respectively located on two opposite sides of the second body 210, and the second support plate 250 can increase the strength of the second frame 200; wherein the width W3 of the first support plate 150 is greater than the width of the second support plate 250. Preferably, the first body 110 is in the shape of a regular quadrangular prism as a whole, see Figure 1 As shown, the first support plate 150 is substantially parallel to the first stopper 130. The second body 210 is in the shape of a regular quadrangular prism as a whole. Figure 2 As shown, Figure 2This is a schematic diagram of a second frame of a packaging frame according to an embodiment of the present utility model, in which the second support plate 250 and the second limiting member 230 are substantially arranged in parallel.

[0064] Preferably, the width of the second support plate 250 may be 0, that is, the second support plate 250 may not be provided.

[0065] In some of these embodiments, see Figure 3 As shown, Figure 3 This is a schematic diagram of the coordination of the first frame and the second frame of an embodiment of the present invention, in which the first frame 100 and the second frame 200 are connected by connecting corner brackets.

[0066] An embodiment of the present application also provides a photovoltaic module.

[0067] A photovoltaic module, see Figure 4 As shown, Figure 4 The encapsulation frame and battery string encapsulation schematic diagram of an embodiment of the utility model includes a solar cell and an encapsulation frame 10. The first frame 100 encapsulates the longer edge of the solar cell. The second frame 200 encapsulates the shorter edge of the solar cell. The end of the first frame 100 is connected to the end of the second frame 200 by a corner code.

[0068] In some of these embodiments, see Figure 3 As shown, the end face of the first frame 100 and the end face of the second frame 200 are respectively in the shape of a wedge-shaped inclined surface, and the first frame 100 and the second frame 200 are vertically arranged, wherein the angle α between the end face of the first frame 100 and its length direction is 25°~40°, the angle β between the end face of the second frame 200 and its length direction is 50°~65°, and the sum of the two angles is 90°.

[0069] Compared with the conventional technology, the packaging frame 10 of the present application has the following beneficial effects:

[0070] (1) By optimizing the gap reflection and the spacing between the battery strings 20, the power of the module is significantly improved, and the module power and efficiency are higher.

[0071] (2) The present application increases the compatibility of the battery string 20 spacing and large-size batteries, providing greater flexibility for process control and having better process control capabilities. The present application reduces the width of the first stopper 130 of the first frame 100 and increases the distance D1 between the battery cell and the edge, thereby increasing the lateral margin of the component, making the component compatible with large-size batteries and large string spacing to improve efficiency, increasing the process control window, and improving power and yield.

[0072] (3) The present application has better compatibility and can achieve compatibility of photovoltaic modules of the same size with larger-sized cells. The present application optimizes the design of the module frame by optimizing the structural design of the first frame 100 and the second frame 200, reducing the width of the first stopper 130 of the first frame 100, increasing the width of the second stopper 230, and using first stoppers 130 or second stoppers 230 of different widths on different edges.

[0073] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0074] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A packaging frame (10), characterized in that: The invention comprises a first frame (100) and a second frame (200), wherein the first frame (100) is used to encapsulate the longer edge of a solar cell, and the second frame (200) is used to encapsulate the shorter edge of a solar cell, the first frame (100) comprises a first main body (110), a first abutting member (120) and a first limiting member (130), the first frame (100) having a first corner code cavity (111) for embedding and connecting a corner code, one side of the first abutting member (120) is connected to an outer surface of one side wall of the first main body (110), the first limiting member (130) is connected to an end of the first abutting member (120) away from the first main body (110), and a first mounting groove (140) for mounting a solar cell is formed between the first limiting member (130), the first abutting member (120) and the side wall of the first main body (110); The second frame (200) comprises a second main body (210), a second abutting member (220) and a second limiting member (230); the second frame (200) has a second corner code cavity (211) for embedding and connecting the corner code; one side of the second abutting member (220) is connected to the outer surface of one side wall of the second main body (210); the second limiting member (230) is connected to an end of the second abutting member (220) away from the second main body (210); the second limiting member (230), the second abutting member (220) and the side wall of the second main body (210) form a second installation groove (240) for installing a solar cell; the width of the first limiting member (130) is smaller than the width of the second limiting member (230).

2. The packaging frame (10) according to claim 1, characterized in that: The outer surface of the side wall of the first main body (110) located in the first installation groove (140) forms a first bearing surface (112), and the first bearing surface (112) is used to support a portion of the back surface of the solar cell; And / or, the outer surface of the side wall of the second body (210) located in the second installation groove (240) forms a second bearing surface (212), and the second bearing surface (212) is used to support a portion of the back side of the solar cell.

3. The packaging frame (10) according to claim 2, characterized in that: The first bearing surface (112) is gradually inclined inward at an angle of 3° to 7° from a side away from the first abutment member (120) to a side adjacent to the first abutment member (120); And / or, the second bearing surface (212) is gradually inclined inward at an angle of 3° to 7° from a side away from the second abutment member (220) to a side adjacent to the second abutment member (220).

4. The packaging frame (10) according to claim 1, characterized in that: The first limiting member (130) has a first glue overflow groove (131) on its inner surface facing the first installation groove (140), and the first glue overflow groove (131) is used to accommodate the connecting member; And / or, the inner surface of the second limiting member (230) facing the inside of the second installation groove (240) has a second glue overflow groove, and the second glue overflow groove is used to accommodate the connecting component.

5. The packaging frame (10) according to claim 1, characterized in that: At least a portion of the outer surface of the first limiting member (130) away from the first mounting groove (140) is in a curved shape; And / or, at least a portion of the outer surface of the second limiting member (230) away from the second mounting groove (240) is in a curved shape.

6. The packaging frame (10) according to any one of claims 1 to 5, characterized in that: The first main body (110) is a hollow quadrangular prism-shaped structure, and the first abutment member (120) is connected to one of the side walls; And / or, the second main body (210) is a hollow quadrangular prism-shaped structure, and the second abutment member (220) is connected to one of the side walls.

7. The packaging frame (10) according to any one of claims 1 to 5, characterized in that: A plurality of reinforcing ribs (300) are connected to at least one inner wall of the first body (110); And / or, a plurality of reinforcing ribs (300) are connected to at least one inner wall of the second body (210).

8. The packaging frame (10) according to any one of claims 1 to 5, characterized in that: A first support plate (150) is also connected to the first main body (110), and the first support plate (150) and the first abutment member (120) are respectively located on two opposite sides of the first main body (110); A second supporting plate (250) is also connected to the second main body (210), and the second supporting plate (250) and the second abutting member (220) are respectively located on two opposite sides of the second main body (210); The width of the first support plate (150) is greater than the width of the second support plate (250).

9. A photovoltaic module, characterized in that: The invention comprises a solar cell and a packaging frame (10) as claimed in any one of claims 1 to 8, wherein the first frame (100) packages the longer edge of the solar cell, the second frame (200) packages the shorter edge of the solar cell, and the end of the first frame (100) is connected to the end of the second frame (200) by an angle code.

10. The photovoltaic module according to claim 9, characterized in that: The end face of the first frame (100) and the end face of the second frame (200) are respectively in the shape of a wedge-shaped inclined surface, and the first frame (100) and the second frame (200) are arranged vertically, wherein the angle between the end face of the first frame (100) and its length direction is 25° to 40°, and the angle between the end face of the second frame (200) and its length direction is 50° to 65°, and the sum of the two angles is 90°.

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