Brazing clamp for copper-clad plate

Abstract

The utility model relates to the technical field of brazing clamps, and provides a brazing clamp for a copper-clad plate, the brazing clamp comprises a plurality of clamping plates and a plurality of locking pieces, at least one of every two adjacent clamping plates is provided with a limiting groove with an opening facing the other clamping plate, and the limiting grooves are used for containing copper foil of the copper-clad plate so as to limit the copper foil; and the plurality of locking pieces are used for locking and fixing the plurality of clamping plates and the copper-clad plate together. According to the brazing clamp for the copper-clad plate, the limiting grooves are formed in the clamping plates, so that the periphery of the copper foil is limited through the limiting grooves in the brazing process, thermal expansion of the copper foil is hindered, and after brazing is finished, the shrinkage degree of the copper foil is close to that of the ceramic substrate; the residual stress caused by large thermal expansion difference between the copper foil and the ceramic substrate is greatly eliminated, and the problem of warping of the ceramic substrate is solved.

Description

Technical Field

[0001] The present application relates to the technical field of brazing fixtures, and in particular to a brazing fixture for copper-clad laminates. Background Art

[0002] Copper clad laminates have the characteristics of high thermal conductivity, good heat resistance, high mechanical strength, good insulation, and corrosion resistance, and are widely used in electronic device packaging. AMB (Active Metal Brazing) copper clad laminates are widely used in scenarios with high requirements for hot and cold cycle reliability due to their excellent performance and reliability, such as new energy vehicles, rail transit, power grids, photovoltaics, and other fields.

[0003] The production process of AMB copper clad laminate is as follows: provide a ceramic substrate, first apply solder on the surface of the ceramic substrate, and then cover the solder with copper foil; then, clamp the copper foil on the ceramic substrate through a brazing fixture and put it into a brazing furnace for brazing to obtain an AMB copper clad laminate.

[0004] Since the thermal expansion coefficient of copper foil is greater than that of ceramic substrate, during brazing, the thermal expansion rate of copper foil is greater than that of ceramic substrate, and after brazing, the cold contraction rate of copper foil is greater than that of ceramic substrate. Since copper foil and ceramic substrate are fixed together after brazing, large residual stress will be generated after the copper foil and ceramic substrate shrink, causing the ceramic substrate to warp. Utility Model Content

[0005] In view of this, an embodiment of the present application provides a brazing fixture for a copper-clad laminate to solve the problem of warping of a ceramic substrate.

[0006] An embodiment of the first aspect of the present application proposes a brazing fixture for a copper-clad laminate, comprising a plurality of clamps and a plurality of locking pieces, wherein at least one of two adjacent clamps is provided with a limiting groove opening toward the other clamp, and the limiting groove is used for placing the copper foil of the copper-clad laminate to limit the copper foil; and the plurality of locking pieces are used for locking and fixing the plurality of clamps and the copper-clad laminate together.

[0007] The brazing fixture for copper-clad laminates provided in the embodiment of the present application provides limiting grooves on the clamping plate to limit the four sides of the copper foil through the limiting grooves during the brazing process, thereby hindering the thermal expansion of the copper foil. After the brazing is completed, the shrinkage degree of the copper foil and the ceramic substrate is similar, which greatly eliminates the residual stress induced by the excessive difference in thermal expansion between the copper foil and the ceramic substrate, and solves the problem of warping of the ceramic substrate.

[0008] In some embodiments, the plurality of clamps include two outer clamps and at least one middle clamp. The middle clamp is located between the two outer clamps, and the limiting grooves are provided on opposite sides of the middle clamp.

[0009] In some embodiments, the limiting grooves are provided on two opposite sides of at least one of the outer clamping plates.

[0010] In some embodiments, the depth of the limiting groove is 1-5 mm.

[0011] In some embodiments, the limiting groove is a regular groove.

[0012] In some embodiments, the limiting groove is formed by a depression on the surface of the clamping plate.

[0013] In some embodiments, the clamping plate is a heat conductive plate.

[0014] In some embodiments, the thermally conductive plate is a graphite plate.

[0015] In some embodiments, the locking member includes a locking bolt and a locking nut for screwing onto the locking bolt, and the clamping plate is provided with a bolt through-hole for the locking bolt to pass through.

[0016] In some embodiments, the clamping plate is rectangular, and the bolt holes are arranged on four edges of the clamping plate.

[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or conventional technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a schematic diagram of the structure of a brazing fixture for copper-clad laminates provided in some embodiments of the present application;

[0020] Figure 2 yes Figure 1 A cross-sectional view of a brazing fixture for copper-clad laminates shown;

[0021] Figure 3 yes Figure 1 A schematic diagram of the structure of the splint shown;

[0022] Figure 4 yes Figure 1 Schematic diagram of the structure of the brazing fixture for copper clad laminate and the copper clad laminate shown.

[0023] The meanings of the marks in the figure are:

[0024] 10. Brazing fixture for copper clad laminate;

[0025] 11. Clamping plate; 111. Limiting groove; 112. Bolt hole;

[0026] 12. Locking piece; 121. Locking nut; 122. Locking bolt;

[0027] 20. Copper clad laminate;

[0028] 21. Ceramic substrate;

[0029] 22. Solder;

[0030] 23. Copper foil. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0033] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0034] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0036] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0037] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application 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. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0038] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "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, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0039] At present, the production process of AMB copper clad laminate is as follows: provide a ceramic substrate, first apply solder on the two opposite sides of the ceramic substrate, and then cover the solder with copper foil; then, clamp the copper foil on the ceramic substrate with a brazing fixture and put it into a brazing furnace for brazing to obtain an AMB copper clad laminate. During the brazing process, the thermal expansion rate of the copper foil is greater than the thermal expansion rate of the ceramic substrate. After the brazing is completed, the cold contraction rate of the copper foil is greater than the cold contraction rate of the ceramic substrate; since the copper foil and the ceramic substrate are fixed together after the brazing is completed, a large residual stress will be generated after the copper foil and the ceramic substrate shrink, causing the ceramic substrate to warp.

[0040] In order to solve the problem of ceramic substrate warping, the present application proposes a brazing fixture for copper clad laminates.

[0041] Please also refer to Figure 1 and Figure 2The brazing fixture 10 for copper clad laminates includes a plurality of clamping plates 11 and a plurality of locking members 12. At least one of the two adjacent clamping plates 11 is provided with a limiting groove 111 opening toward the other clamping plate 11, and the limiting groove 111 is used to place the copper foil 23 of the copper clad laminate 20 to limit the copper foil 23; the plurality of locking members 12 are used to lock and fix the plurality of clamping plates 11 and the copper clad laminate 20 together.

[0042] Please refer to Figure 4 The copper clad laminate 20 to be brazed includes a copper foil 23, a solder 22, a ceramic substrate 21, a solder 22 and a copper foil 23 arranged in sequence from top to bottom. The solder 22 is applied on both sides of the ceramic substrate 21, and the copper foil 23 covers the solder 22.

[0043] The shape of the splint 11 is not limited in this application, as long as it can completely cover the copper clad laminate 20. It can be understood that the splint 11 can be a polygonal plate, for example, a rectangular plate; the splint 11 can also be an elliptical plate, a circular plate, etc. Of course, the splint 11 can also be a special-shaped plate.

[0044] The number of the clamping plates 11 in the present application is not limited and can be designed according to the number of copper-clad plates 20 to be brazed at one time; for example, the clamping plates 11 can be two, three, or four or more, and the stacking direction of the clamping plates 11 is Figure 2 A placement space for placing the copper clad laminate 20 is formed between two adjacent clamping plates 11 .

[0045] At least one of the two adjacent clamping plates 11 is provided with a limiting groove 111 opening toward the other clamping plate 11. It can be understood that both clamping plates 11 are provided with limiting grooves 111. Figure 2 As shown, the two adjacent clamping plates 11 can be regarded as the upper clamping plate and the lower clamping plate respectively, and the opposite sides of the upper clamping plate and the lower clamping plate are provided with a limiting groove 111, that is, the lower side of the upper clamping plate and the upper side of the lower clamping plate are provided with a limiting groove 111. At this time, the copper foil 23 can be brazed on both sides of the ceramic substrate 21 at the same time. It can also be understood that only one of the clamping plates 11 is provided with a limiting groove 111, and the two adjacent clamping plates 11 are regarded as the upper clamping plate and the lower clamping plate respectively. For example, the limiting groove 111 can be set only on the side of the upper clamping plate facing the lower clamping plate, that is, the limiting groove 111 is set only on the lower side of the upper clamping plate; or, the limiting groove 111 can be set only on the side of the lower clamping plate facing the upper clamping plate, that is, the limiting groove 111 is set only on the upper side of the lower clamping plate; at this time, the copper foil 23 can be brazed on one side of the ceramic substrate 21 first, and then the ceramic substrate 21 is turned over, and the copper foil 23 is brazed on the other side of the ceramic substrate 21.

[0046] The limiting groove 111 is used to place the copper foil 23 of the copper clad laminate 20 to limit the copper foil 23. It can be understood that the limiting groove 111 has the same shape as the copper foil 23. For example, the copper foil 23 is rectangular, and correspondingly, the limiting groove 111 is rectangular; or, the copper foil 23 and the limiting groove 111 are both trapezoidal, circular, elliptical or other shapes.

[0047] It is understood that the size of the limiting groove 111 can be the same as the size of the copper foil 23, so that the copper foil 23 does not undergo thermal expansion during the brazing process; or the size of the limiting groove 111 can be slightly larger than the size of the copper foil 23, so that the copper foil 23 undergoes less thermal expansion during the brazing process. Both of the above methods will not cause the ceramic substrate 21 to warp after the brazing is completed.

[0048] The form of the locking member 12 is not limited in this application, as long as it can fix the clamping plate 11 and the copper-clad laminate 20 together; for example, the locking member 12 may include a locking bolt and a locking nut; or, the locking member 12 includes a U-shaped plate and a locking bolt, at least one of the two parallel plates of the U-shaped plate is provided with a threaded hole, and the locking bolt is screwed into the threaded hole.

[0049] The brazing fixture 10 for copper clad laminate provided in the embodiment of the present application is provided with a limiting groove 111 on the clamping plate 11, so as to limit the four sides of the copper foil 23 through the limiting groove 111 during the brazing process, thereby hindering the thermal expansion of the copper foil 23. After the brazing is completed, the shrinkage degree of the copper foil 23 and the ceramic substrate 21 is similar, which greatly eliminates the residual stress induced by the excessive difference in thermal expansion between the copper foil 23 and the ceramic substrate 21, solves the problem of warping of the ceramic substrate 21, and improves the quality and yield rate of the copper clad laminate 20.

[0050] Please also refer to Figure 1 and Figure 2 In some embodiments, the plurality of splints 11 include two outer splints and at least one middle splint, the middle splint is located between the two outer splints, and limiting grooves 111 are provided on opposite sides of the middle splint.

[0051] The two outer splints refer to the splints 11 at both ends of the plurality of splints 11, such as Figure 2 As shown, the two outer splints are respectively the top splint 11 and the bottom splint 11 .

[0052] Optionally, the intermediate plates are of the same size and structure.

[0053] The number of intermediate clamps can be designed according to the number of copper clad laminates 20 welded at one time by the copper clad laminate brazing fixture 10. For example, if the number of copper clad laminates 20 welded at one time is two, one intermediate clamp is set between the two outer clamps; or, if the number of copper clad laminates 20 welded at one time is three, two intermediate clamps are set between the two outer clamps; it can be understood that the number of intermediate clamps set is one less than the number of copper clad laminates 20 welded at one time.

[0054] Among them, the opposite sides of the middle splint refer to Figure 2 On opposite sides of the direction indicated by the arrow.

[0055] By adopting the above technical solution, the brazing fixture 10 for copper clad laminates can weld multiple copper clad laminates 20 at one time, and the copper foils 23 on both sides of each copper clad laminate 20 can be brazed at the same time, thereby improving the welding efficiency. In addition, the layered structure of the brazing fixture 10 for copper clad laminates makes the temperature uniformity inside the copper clad laminate 20 better during the brazing process, reduces the problems of welding void rate and uneven stress, and is conducive to improving the welding quality of the copper clad laminate 20.

[0056] In other embodiments, the plurality of clamping plates only include two outer clamping plates but do not include a middle clamping plate. In this case, the number of copper clad laminates 20 that can be welded at one time by the copper clad laminate brazing fixture 10 is one.

[0057] Please also refer to Figure 1 and Figure 2 As shown, in some embodiments, two opposite sides of at least one outer clamping plate are provided with limiting grooves 111 .

[0058] Among them, the opposite sides of the lateral splint are Figure 2 On opposite sides of the direction indicated by the arrow.

[0059] It can be understood that the limiting grooves 111 can be provided on both sides of the two outer clamping plates, or the limiting grooves 111 can be provided on both sides of the two outer clamping plates.

[0060] In the embodiment of the present application, by providing limiting grooves 111 on opposite sides of the outer splint, the outer splint and the middle splint have the same structure, so the outer splint and the middle splint can be interchanged without considering the placement order.

[0061] It can be understood that in other embodiments, the limiting groove 111 can be provided only on one side of the two outer clamping plates, and the openings of the two limiting grooves 111 are both toward the middle clamping plate. Figure 2 The bottom and top parts of the splint cannot be interchanged with the middle splint.

[0062] In some embodiments, the depth of the limiting groove 111 is 1-5 mm.

[0063] The depth direction of the limiting groove 111 is Figure 2 Direction indicated by the arrow.

[0064] The depth of the limiting groove 111 can be designed according to the thickness of the copper foil 23 . For example, the depth of the limiting groove 111 can be 1 mm, 3 mm, 5 mm, etc.

[0065] Optionally, the depth of the limiting groove 111 is less than or equal to the thickness of the copper foil 23 to avoid interference between the clamping plate 11 and the ceramic substrate 21 and failure to clamp the copper foil 23 on the ceramic substrate 21 .

[0066] Since the depth of the limiting groove 111 is not too large, the limiting groove 111 can ensure the structural strength of the clamping plate 11 while limiting the copper foil 23 .

[0067] In other embodiments, the depth of the limiting groove 111 may not be an integer. For example, the depth of the limiting groove 111 may be 1.5 mm, 3.2 mm, 4.7 mm, etc.

[0068] In some embodiments, the limiting groove 111 is a regular groove.

[0069] Alternatively, if Figure 3 As shown, the limiting groove 111 is a rectangular groove, so as to be suitable for the rectangular copper clad plate 20. Of course, the limiting groove 111 can also be a circular groove, a trapezoidal groove, a parallelogram groove, a regular pentagonal groove, etc.

[0070] By designing the limiting groove 111 as a regular groove, the processing process of the limiting groove 111 is simplified and the processing efficiency of the limiting groove 111 is improved.

[0071] In other embodiments, the limiting groove 111 may also be an irregular groove, for example, an irregular polygon.

[0072] In some embodiments, the limiting groove 111 is formed by a depression on the surface of the clamping plate 11 .

[0073] The limiting groove 111 is formed by a depression on the surface of the clamping plate 11, which means that the bottom wall of the limiting groove 111 is lower than the surface of the clamping plate 11. It can be understood that the limiting groove 111 can be formed by machining or casting.

[0074] The adoption of the above technical solution is beneficial to the processing of the limiting groove 111 .

[0075] In other embodiments, a plurality of ridges may be provided on the surface of the clamping plate 11, and the plurality of ridges are connected end to end to form a limiting groove 111, that is, the bottom wall of the limiting groove 111 is flush with the surface of the clamping plate 11. It is understood that the ridges may be integrally formed with the clamping plate 11, or may be fixed to the clamping plate 11 (including but not limited to welding).

[0076] In some embodiments, the clamping plate 11 is a heat conducting plate.

[0077] The heat conducting plate can quickly conduct heat to the copper clad laminate 20 to improve the brazing efficiency of the copper clad laminate 20 ; at the same time, the heat conducting plate can ensure the uniformity of heating of the copper clad laminate 20 , thereby ensuring the brazing quality of the copper clad laminate 20 .

[0078] In some embodiments, the thermally conductive plate is a graphite plate.

[0079] The graphite plate has good thermal conductivity, which is beneficial to the conduction of heat and ensures that the copper-clad plate 20 is evenly heated. Optionally, the graphite plate is isostatically pressed graphite.

[0080] At the same time, the thermal expansion coefficient of the graphite plate is close to that of the ceramic substrate 21. During the brazing process, both the ceramic substrate 21 and the graphite plate undergo thermal expansion, and their thermal expansion rates are similar. The limiting groove 111 becomes larger as the graphite plate expands, and the copper foil 23 also undergoes thermal expansion. However, due to the limitation of the limiting groove 111, the thermal expansion rate of the copper foil 23 is similar to that of the ceramic substrate 21. After brazing, the copper foil 23 and the ceramic substrate 21 will also shrink synchronously, so the ceramic substrate 21 is less likely to warp, thereby ensuring the welding quality of the copper clad laminate 20.

[0081] In other embodiments, the heat conducting plate may be other plates, for example, a copper plate.

[0082] Please also refer to Figure 2 and Figure 3 In some embodiments, the locking member 12 includes a locking bolt 122 and a locking nut 121 for screwing onto the locking bolt 122 , and the clamping plate 11 is provided with a bolt through hole 112 for the locking bolt 122 to pass through.

[0083] The shape of the bolt through hole 112 is not limited in the present application. For example, the bolt through hole 112 can be a round hole, a square hole, an elliptical hole, a triangular hole, etc.

[0084] Optionally, each clamping plate 11 is provided with a bolt through hole 112 ; during assembly, the locking bolt 122 passes through the bolt through hole 112 on each clamping plate 11 in turn, and then the locking nut 121 is screwed onto the locking bolt 122 to press the copper clad laminate 20 between two adjacent clamping plates 11 .

[0085] Since the locking bolt 122 passes through the bolt through hole 112 of each clamp 11, when the clamp 11 is pressing the copper clad laminate 20, the locking bolt 122 can limit the clamp 11 to avoid deviation between two adjacent clamps 11 and ensure alignment of the clamps 11.

[0086] In other embodiments, only Figure 2 Bolt holes 112 are set on the top and bottom two clamping plates 11, that is, bolt holes 112 are only set on the two outer clamping plates, and no bolt holes 112 are set on the middle clamping plate. At this time, the size of the middle clamping plate should be smaller than the size of the clamping plates on both sides; during assembly, the locking bolts 122 pass through the bolt holes 112 on the two outer clamping plates 11 in turn, and then the locking nuts 121 are screwed on the locking bolts 122 to press the copper clad laminate 20 between the two adjacent clamping plates 11.

[0087] In other embodiments, the locking member 12 may include a U-shaped plate and a locking bolt, the U-shaped plate includes two parallel plates and a connecting plate connecting the two parallel plates, and all the clamps 11 are located between the two parallel plates. It can be understood that there are two locking bolts, the two parallel plates are respectively provided with threaded holes, the two locking bolts are respectively screwed into the threaded holes, and the two locking bolts are respectively pressed on the two outer clamps to press the copper clad plate 20 between the two adjacent clamps 11; or, there is one locking bolt, one of the two parallel plates is provided with a threaded hole, the locking bolt is screwed into the threaded hole, the other of the two parallel plates is close to one of the outer clamps, and the locking bolt is pressed on the other outer clamp to press the copper clad plate 20 between the two adjacent clamps 11.

[0088] Please refer to Figure 3 In some embodiments, the clamping plate 11 is rectangular, and bolt through holes 112 are provided on the four edges of the clamping plate 11 .

[0089] Optionally, the splint 11 may be rectangular, and the number of bolt holes 112 on the two long sides of the splint 11 is greater than the number of bolt holes 112 on the two short sides of the splint 11. For example, three bolt holes 112 are respectively provided on the two long sides of the splint 11, and two bolt holes 112 are respectively provided on the two short sides of the splint 11.

[0090] Optionally, the clamping plate 11 may be rectangular, and the number of bolt through holes 112 on the two long sides and the two short sides of the clamping plate 11 is the same. For example, the two long sides and the two short sides of the clamping plate 11 may each be provided with one, two, or three or more bolt through holes 112.

[0091] Bolt through holes 112 are provided on the edges of the clamp 11 to cooperate with multiple locking members 12 to lock the copper clad laminate brazing fixture 10, so as to ensure the stability of the copper clad laminate brazing fixture 10 after locking the copper clad laminate 20, and at the same time ensure the uniformity of the force on the copper clad laminate 20.

[0092] In other embodiments, the clamping plate 11 may be circular, and a plurality of bolt through holes 112 are arranged at intervals along the circumference of the edge of the clamping plate 11 .

[0093] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A brazing fixture for copper-clad laminate, characterized in that: It comprises a plurality of clamps and a plurality of locking members, wherein at least one of the two adjacent clamps is provided with a limiting groove opening toward the other clamp, and the limiting groove is used for placing the copper foil of the copper clad laminate to limit the copper foil; and the plurality of locking members are used for locking and fixing the plurality of clamps and the copper clad laminate together.

2. The brazing fixture for copper-clad laminate according to claim 1, characterized in that: The plurality of clamping plates include two outer clamping plates and at least one middle clamping plate, wherein the middle clamping plate is located between the two outer clamping plates, and the limiting grooves are provided on opposite sides of the middle clamping plate.

3. The brazing fixture for copper-clad laminate according to claim 2, characterized in that: The limiting grooves are provided on opposite sides of at least one of the outer clamping plates.

4. The brazing fixture for copper-clad laminate according to claim 1, characterized in that: The depth of the limiting groove is 1-5 mm.

5. The brazing fixture for copper-clad laminate according to claim 1, characterized in that: The limiting groove is a regular groove.

6. The brazing fixture for copper-clad laminate according to claim 1, characterized in that: The limiting groove is formed by a depression on the surface of the clamping plate.

7. The brazing fixture for copper-clad laminate according to any one of claims 1 to 6, characterized in that: The clamping plate is a heat conducting plate.

8. The brazing fixture for copper-clad laminate according to claim 7, characterized in that: The heat conducting plate is a graphite plate.

9. The brazing fixture for copper-clad laminate according to any one of claims 1 to 6, characterized in that: The locking member comprises a locking bolt and a locking nut for being screwed on the locking bolt, and the clamping plate is provided with a bolt through-hole for the locking bolt to pass through.

10. The brazing fixture for copper-clad laminate according to claim 9, characterized in that: The clamping plate is rectangular, and the bolt through holes are arranged on the edges of the clamping plate.

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