Circuit board fixing structure

Abstract

The utility model discloses a circuit board fixing structure, and belongs to the technical field of circuit board assembly. The fixing structure comprises a shell and a buckle component, the shell comprises side plates and a bottom plate, the side plates define a containing cavity on the bottom plate, and the containing cavity is used for containing a circuit board; the buckle component is arranged in the containing cavity, the buckle component comprises a connecting part and a limiting part, the connecting part is connected with the bottom plate and the side plate and extends in the first direction, the limiting part is connected with the end, away from the bottom plate, of the connecting part, and after the limiting part abuts against the circuit board, the circuit board is limited and fixed. According to the circuit board fixing structure, the circuit board is limited and fixed on the basis of the buckle component after the buckle component abuts against the limiting part through pressing of the circuit board, the convenient circuit board fixing structure is provided, and the technical problem that the limiting and fixing process of fixing the circuit board in an electronic product is tedious is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of circuit board assembly, and specifically relates to a circuit board fixing structure. Background Art

[0002] With the rapid development of various electronic products, circuit boards are widely used in various electronic products. Most circuit boards are fixed in the internal structure of electronic products by bolt connection or hot riveting connection. In this process, the process of fixing the circuit boards in the internal structure of electronic products is relatively cumbersome. Utility Model Content

[0003] In response to the above problems, the present application provides a circuit board fixing structure, which solves the problem that the process of fixing the circuit board in a limited position inside an electronic product is relatively cumbersome.

[0004] The present invention provides a circuit board fixing structure, which includes:

[0005] The housing comprises side panels and a bottom panel, wherein the side panels form a receiving cavity on the bottom panel, and the receiving cavity is used to place the circuit board;

[0006] The snap-fit ​​component is arranged in the accommodating cavity. The snap-fit ​​component includes a connecting part and a limiting part. The connecting part is respectively connected to the bottom plate and the side plate and extends along the first direction. The limiting part is connected to an end of the connecting part away from the bottom plate. After the limiting part is abutted against the circuit board, the circuit board is limited and fixed.

[0007] In some embodiments, the limiting portion protrudes from the connecting portion and has a first limiting surface facing the bottom plate;

[0008] The limiting portion also has a first guide surface and a second guide surface connected in sequence. The second guide surface is connected to the first limiting surface. The circuit board abuts against the first guide surface and the second guide surface in sequence so that the side of the circuit board away from the bottom plate abuts against the first limiting surface.

[0009] In some embodiments, the fixing structure further comprises:

[0010] Support components, including:

[0011] A connecting support portion connected to the bottom plate and extending along a first direction;

[0012] an extension portion connected to an end of the connecting support portion away from the bottom plate;

[0013] The connecting support portion protrudes from the extension portion and has a second limiting surface facing the circuit board. The circuit board has a hole passing through it along the first direction. The extension portion passes through the hole and abuts the second limiting surface against a surface of the circuit board close to the bottom plate, so that the circuit board is limited and fixed between the first limiting surface and the second limiting surface.

[0014] In some embodiments, the fixing structure further comprises:

[0015] Limiting components, the limiting components include:

[0016] a connecting member, connected to the bottom plate and the connecting support portion respectively and extending along the first direction;

[0017] an extension member connected to an end of the connection member facing away from the bottom plate, the extension member having a third guide surface and a fourth limiting surface, the fourth limiting surface facing the extension portion and connected to the third guide surface;

[0018] The connecting member protrudes from the extending member and has a third limiting surface facing the circuit board. The third limiting surface and the second limiting surface are in the same plane. When the circuit board is limited and fixed between the first limiting surface and the second limiting surface, the third limiting surface and the fourth limiting surface constitute a limiting step to abut and limit the circuit board.

[0019] In some embodiments, the fixing structure further comprises:

[0020] The support member is connected to the bottom plate and extends along the first direction. The support member has a fifth limiting surface facing the circuit board, and the fifth limiting surface and the second limiting surface are in the same plane.

[0021] In some embodiments, the fixing structure further comprises:

[0022] a top plate, the top plate being opposite to the bottom plate in a first direction;

[0023] Buckle, connected to the top plate;

[0024] The buckle protrusion is arranged on a side of the side plate away from the accommodating cavity, and the buckle is engaged with the buckle protrusion to connect the top plate to the shell.

[0025] In some embodiments, the fixing structure further comprises:

[0026] The limiting member is connected to the top plate and extends in the opposite direction of the first direction. When the bottom plate is connected to the shell, one end of the limiting member away from the top plate abuts against one end of the extension away from the connecting support portion and protrudes from the extension portion.

[0027] In some embodiments, the side panels have a limiting groove in the second direction toward the top panel, and / or the side panels have a limiting groove in the third direction toward the top panel; the third direction intersects with the first direction and the second direction;

[0028] The fixed structure also includes:

[0029] The limit stop bar is connected to the top plate. When the top plate is connected to the side plate, the limit groove and the limit stop bar are engaged in a one-to-one manner to limit the position.

[0030] In some embodiments, the fixing structure further comprises:

[0031] The stabilizing component includes a first reinforcing component, the first reinforcing component is connected to the top plate, and when the bottom plate and the top plate are connected, the first reinforcing component abuts against a side of the side plate facing the accommodating cavity.

[0032] In some embodiments, the stabilizing component also includes: a plurality of second reinforcement members, the plurality of second reinforcement members are connected to a side of the top plate facing the bottom plate, the plurality of second reinforcement members are intersectingly arranged on the top plate, and / or, a plurality of second reinforcement members are connected to a side of the bottom plate facing the top plate, the plurality of second reinforcement members are intersectingly arranged on the bottom plate.

[0033] Beneficial effects: The present application provides a circuit board fixing structure, the fixing structure including: a shell, a snap-fit ​​component, the shell including side panels and a bottom panel, the side panels forming a receiving cavity on the bottom panel, the receiving cavity being used to place the circuit board; a snap-fit ​​component, the snap-fit ​​component being arranged in the receiving cavity, the snap-fit ​​component including a connecting portion and a limiting portion, the connecting portion being respectively connected to the bottom panel and the side panel and extending along a first direction, the limiting portion being connected to an end of the connecting portion away from the bottom panel, the limiting portion being against the circuit board to limit and fix the circuit board. In the present application, based on the snap-fit ​​component, the circuit board is limited and fixed by pressing the circuit board against the limiting portion, providing a convenient circuit board fixing structure, solving the technical problem of the cumbersome process of fixing the circuit board inside the electronic product. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic diagram of the structure of a circuit board in a receiving cavity provided in an embodiment of the present application;

[0036] Figure 2 A schematic structural diagram of a housing provided in an embodiment of the present application;

[0037] Figure 3 A schematic diagram of the structure of the top plate provided in an embodiment of the present application;

[0038] Figure 4 A schematic diagram of the structure of the connection between the shell and the top plate provided in an embodiment of the present application.

[0039] Description of reference numerals:

[0040] 10-shell, 11-bottom plate, 12-side plate, 121-snapping protrusion, 122-limiting groove, 13-accommodating chamber, 20-snapping component, 21-connecting part, 22-limiting part, 221-first guide surface, 222-second guide surface, 223-first limiting surface, 30-circuit board, 31-hole, 40-support component, 41-connecting support part, 411-second limiting surface, 42-extension part, 50-limiting component, 51-connecting part, 511-third limiting surface, 52-extension part, 521-fourth limiting surface, 522-third guide surface, 60-support part, 61-fifth limiting surface, 70-top plate, 71-snapping, 72-limiting component, 73-limiting block bar, 80-stabilizing component, 81-first reinforcement member, 82-second reinforcement member. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0042] In the description of this application, it should be understood that the specific embodiments described herein are only used to illustrate and explain this application and are not used to limit this application. The terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0043] It should also be noted that in the drawings of the embodiments of this application, a marked arrow indicates a first direction Z, a marked arrow indicates a second direction X, and a marked arrow indicates a third direction Y. The description of this application introduces the first direction Z, the second direction X, and the third direction Y to more clearly illustrate the structure and relative positional relationships of the various components in the circuit board fixing structure. In actual applications, the first direction Z, the second direction X, and the third direction Y can point to any direction in space. Optionally, the first direction Z, the second direction X, and the third direction Y are perpendicular to each other.

[0044] The present application provides a circuit board fixing structure, which is described in detail below. It should be noted that the order of description of the following embodiments does not limit the preferred order of the embodiments of the present application. In addition, in the following embodiments, the description of each embodiment has its own emphasis. For parts not detailed in one embodiment, please refer to the relevant description of other embodiments.

[0045] As a preface to the embodiments of the present application, the current methods for fixing circuit boards in battery management system products on the market are divided into two types of fixing methods: hot riveting and bolt connection. The method of fixing with bolts requires adding bolt fixing and torque inspection processes, which leads to an increase in standard working hours: it is also necessary to add screw machines, torque testers, labor, and bolt material costs. In addition, the circuit board is easily damaged, and the bolt torque is difficult to control. Excessive torque will cause local damage and deformation of the circuit board, while too little torque will cause the bolt to fall off, making the bolt, as a foreign object, easy to damage the internal electronic components. The method of hot riveting connection requires adding a hot riveting process, which leads to an increase in standard working hours, and it is also necessary to add a hot riveting machine and labor. In addition, the circuit board is easily damaged because the height of the hot riveting head exceeds the maximum temperature that the electronic components can withstand during hot riveting, posing a risk of component damage.

[0046] In view of this, the present application provides a circuit board fixing structure, which includes: a shell and a snap-fit ​​component. In the present application, based on the snap-fit ​​component, the circuit board is pressed against the limiting part to achieve the limiting fixation of the circuit board, providing a convenient circuit board fixing structure, solving the technical problem of the cumbersome process of fixing the circuit board inside the electronic product, so that the circuit board can be conveniently and quickly fixed to the shell. In addition, the present application does not require hot riveting and bolt fixing processes. It only needs to press the circuit board during assembly on the production line, and the snap-fit ​​component designed inside the shell itself can be used to limit and fix the circuit board, which greatly improves the assembly efficiency. In addition, this design does not require the addition of screw machines and hot riveting machines, which can save equipment costs.

[0047] See also Figure 1 and Figure 2 As shown, an embodiment of the present application provides a circuit board fixing structure, including: a shell 10, the shell 10 includes a side panel 12 and a bottom panel 11, the side panel 12 forms a receiving cavity 13 on the bottom panel 11, and the receiving cavity 13 is used to place the circuit board 30; a snap component 20, the snap component 20 is arranged in the receiving cavity 13, the snap component 20 includes a connecting portion 21 and a limiting portion 22, the connecting portion 21 is respectively connected to the bottom panel 11 and the side panel 12 and extends along the first direction Z, the limiting portion 22 is connected to an end of the connecting portion 21 away from the bottom panel 11, and the limiting portion 22 is abutted against the circuit board 30 to limit and fix the circuit board 30.

[0048] It should be noted that, based on the flexibility and elasticity of its own material, the limiting portion 22 allows the circuit board 30 to be placed in the accommodating cavity 13 and then abut against the limiting portion 22, and then enter the accommodating cavity 13 and abut against the limiting portion 22 for limitation. The limiting portion 22 limits and fixes the circuit board 30 in the first direction Z; in the present application, based on the snap-fit ​​component, the circuit board is pressed and abutted against the limiting portion to achieve the limiting fixation of the circuit board, providing a convenient circuit board fixing structure, solving the technical problem of the cumbersome process of fixing the circuit board inside the electronic product, and enabling the circuit board to be conveniently and quickly fixed to the shell; this structure not only simplifies the fixing process, but also can effectively limit the circuit board 30, thereby improving the stability and reliability of the electronic product. Among them, the number of snap-fit ​​components 20 can be multiple and arranged on the side panel 12, and the layout can be adjusted according to actual conditions, and the limiting portion 22 is also connected to the side panel 12, so that the snap-fit ​​component 20 is more stable during the process of abutting against the circuit board 30; in addition, it should be noted that the relative position and relative direction of the structures of each component described in this application refer to the relative position and relative direction when the bottom plate 11 is connected to the top plate 70 and the circuit board 30.

[0049] In some embodiments, the limiting portion 22 protrudes from the connecting portion 21 and has a first limiting surface 223 facing the base plate 11; the limiting portion 22 also has a first guide surface 221 and a second guide surface 222 connected in sequence, and the second guide surface 222 is connected to the first limiting surface 223, and the circuit board 30 abuts against the first guide surface 221 and the second guide surface 222 in sequence, so that the side of the circuit board 30 away from the base plate 11 abuts against the first limiting surface 223.

[0050] It should be noted that the first guide surface 221, the second guide surface 222, and the first limiting surface 223 are connected in sequence. When the circuit board 30 is inserted into the accommodating cavity 13, it abuts against the first guide surface 221, the second guide surface 222, and the first limiting surface 223 in sequence. The first guide surface 221 and the second guide surface 222 guide the circuit board 30 to ensure correct alignment and positioning during the insertion into the accommodating cavity 13, and help avoid dislocation or damage of the circuit board 30 during the insertion process, which is beneficial for the circuit board 30 to be inserted into the accommodating cavity so that the side of the circuit board 30 away from the bottom plate 11 abuts against the first limiting surface 223.

[0051] See also Figure 2As shown, in some embodiments, the fixing component also includes: a supporting component 40, the supporting component 40 includes: a connecting support portion 41, the connecting support portion 41 is connected to the base plate 11 and extends along the first direction Z; an extension portion 42, connected to an end of the connecting support portion 41 away from the base plate 11; the connecting support portion 41 protrudes from the extension portion 42 and has a second limiting surface 411 facing the circuit board 30, the circuit board 30 has a hole 31 passing through the first direction Z, the extension portion 42 passes through the hole 31, and abuts the second limiting surface 411 against a side of the circuit board 30 close to the base plate 11, so that the circuit board 30 is limited and fixed between the first limiting surface 223 and the second limiting surface 411.

[0052] It should be noted that the connecting support portion 41, on the one hand, provides a second limiting surface 411 that abuts against a side of the circuit board 30 close to the base plate 11, thereby playing a limiting role in the opposite direction of the first direction Z; on the other hand, it effectively limits the distance between the circuit board 30 and the base plate 11, so that the circuit board 30 has a suitable space; the circuit board 30 is limited by the abutment between the first limiting surface 223 and the second limiting surface 411, so that the circuit board 30 is limited and fixed between the first limiting surface 223 and the second limiting surface 411; in addition, the number of support components 40 can be multiple, and the layout can be adjusted according to actual conditions.

[0053] See also Figure 2 As shown, in some embodiments, the fixing component also includes: a limiting component 50, the limiting component 50 includes: a connecting member 51, which is respectively connected to the base plate 11 and the connecting support portion 41 and extends along the first direction Z; an extension member 52, which is connected to the end of the connecting member 51 facing away from the base plate 11, the extension member 52 has a third guide surface 522 and a fourth limiting surface 521, the fourth limiting surface 521 faces the extension portion 42 and is connected to the third guide surface 522; the connecting member 51 protrudes from the extension member 52 and has a third limiting surface 511 facing the circuit board 30, the third limiting surface 511 and the second limiting surface 411 are in the same plane, when the circuit board 30 is limited and fixed between the first limiting surface 223 and the second limiting surface 411, the third limiting surface 511 and the fourth limiting surface 521 constitute a limiting step to abut and limit the circuit board 30.

[0054] It should be noted that the third guide surface 522 guides the circuit board 30 to move toward the limiting step; after the extension portion 42 passes through the hole 31, the third limiting surface 511 and the fourth limiting surface 521 constitute a limiting step to abut and limit the circuit board 30, so that the edge of the circuit board 30 is limited within the limiting step. In some embodiments, the connecting support portion 41 is connected to the limiting component 50 in the second direction X and the third direction Y to limit the circuit board 30 in the second direction X and the third direction Y. For example, the extension portion 42 passes through the circuit board 30 near the edge of the circuit board 30, and the side edge of the circuit board abuts the fourth limiting surface 521, thereby limiting the position of the circuit board 30 on the base plate 11.

[0055] See also Figure 2 As shown, in some embodiments, the fixing component further includes: a support member 60, the support member 60 being connected to the base plate 11 and extending along the first direction Z. The support member 60 has a fifth limiting surface 61 facing the circuit board 30, and the fifth limiting surface 61 is coplanar with the second limiting surface 411. It should be noted that the fifth limiting surface 61 is coplanar with the second limiting surface 411. The number of support members 60 can be multiple, and the layout can be adjusted according to actual conditions to provide more support points for the circuit board 30, so that the circuit board 30 can receive more uniform support force during the fixing process.

[0056] In some embodiments, the support component 40 is arranged near the side panel 12, and the limiting component 50 is connected to the side panel 12. On the one hand, it effectively limits the position of the circuit board 30, and on the other hand, it strengthens the strength of the support component 40 and the strength of the side panel 12. The support member 60 is connected to the side panel 12 and is arranged near the snap component 20, which plays a limiting role in the opposite direction of the first direction Z, providing more support points for the circuit board 30, so that the circuit board 30 can obtain more uniform support force during the fixing process.

[0057] See also Figure 2 and Figure 3 As shown, in some embodiments, the fixing component also includes: a top plate 70, which is opposite to the bottom plate 11 in the first direction Z; a buckle 71, which is connected to the top plate 70; a buckle protrusion 121, which is provided on a side of the side plate 12 away from the accommodating cavity 13, and the buckle 71 is engaged with the buckle protrusion 121 to connect the top plate 70 to the shell 10.

[0058] It should be noted that the side panels 12 form a accommodating cavity 13 on the bottom panel 11, and the snap hook 71 engages with the snap hook protrusion 121 to connect the top panel 70 to the side panel 12, and then connect the top panel 70 to the shell 10, so that the circuit board 30 can be completely enclosed in the accommodating cavity 13, thereby providing better protection and improving the stability and reliability of the circuit board.

[0059] As shown in Figure 3 and Figure 4 As shown in

[0060] It should be noted that the end of the limiting piece 72 away from the top plate 70 is in abutment with the end of the extension 42 away from the connecting support part 41 and protrudes from the extension 42, which on the one hand effectively limits the distance between the circuit board 30 and the top plate 70, and on the other hand prevents the circuit board 30 from being excessively shaken to cause damage and other problems. In addition, the limiting piece 72 corresponds to the extension 42 one by one.

[0061] As shown in Figure 2 and Figure 3 As shown in

[0062] It should be noted that the limiting slot 122 and the limiting baffle 73 are clamped and matched to play a limiting role in the second direction X and the third direction Y when the top plate 70 and the side plate 12 are connected, so that the relative position of the top plate 70 and the side plate 12 is limited, which can ensure the alignment between the top plate 70 and the side plate 12, prevent them from being displaced or shaken, and further improve the stability of the product.

[0063] As shown in Figure 2 and Figure 3 As shown in

[0064] It should be noted that the first reinforcing part 81 is an outer contour boss of the top plate 70, and the first reinforcing part 81 is in abutment with the side plate 12 toward the accommodating cavity 13, which plays a role in preventing the top plate 70 from being bent and deformed and can also serve as a baffle in abutment with the side plate 12 toward the accommodating cavity 13 to play a protective role.

[0065] In some embodiments, the stabilizing component 80 also includes: a plurality of second reinforcement members 82, the plurality of second reinforcement members 82 are connected to the side of the top plate 70 facing the bottom plate 11, the plurality of second reinforcement members 82 are intersectingly arranged on the top plate 70, and / or, the plurality of second reinforcement members 82 are connected to the side of the bottom plate 11 facing the top plate 70, the plurality of second reinforcement members 82 are intersectingly arranged on the bottom plate 11.

[0066] It should be noted that the second reinforcement members 82 are arranged on the top plate 70 and the bottom plate 11 to enhance the rigidity and stability of the structure of the top plate 70 and the bottom plate 11 to resist the action of external forces and reduce the deformation of the structure; multiple second reinforcement members 82 are arranged on the top plate 70 and the bottom plate 11 in an intersecting manner, and these reinforcement members cross each other to form a solid support network, so that the top plate 70 and the bottom plate 11 can evenly disperse stress when subjected to external forces to prevent local damage or instability.

[0067] In some embodiments, the connection process of the housing 10, the top plate 70, and the circuit board 30 is as follows:

[0068] First, the hole 31 of the circuit board 30 is aligned with the extension portion 42, and the circuit board 30 is pressed. The circuit board 30 abuts against the limiting portion 22, and then abuts against the first guide surface 221 and the second guide surface 222 based on the pressing, and then is inserted into the accommodating cavity 13. The first limiting surface 223 abuts against the side of the circuit board 30 facing away from the bottom plate 11, and the side of the circuit board 30 close to the bottom plate 11 abuts against the second limiting surface 411, so that the circuit board 30 is limited and fixed between the first limiting surface 223 and the second limiting surface 411; then, the limiting groove 122 is engaged with the limiting stop bar 73, and the buckle 71 is engaged with the buckle protrusion 121, so that the top plate 70 is connected to the side plate 12, thereby achieving the purpose of connecting the housing 10 to the top plate 70 and the circuit board 30. The present application fixes the circuit board in place through interference fit to prevent the circuit board from shaking. This application optimizes the assembly and connection steps of the product, reduces the use of metal bushings and bolts, effectively reduces product costs, and limits the circuit board 30 in the shell, reduces the use of screws, metal bushings, and hot riveting machines, reduces product weight, and does not require the installation of other fixed equipment in the production line, thereby reducing product costs, speeding up work pace, and improving production efficiency.

[0069] Accordingly, in some embodiments, a circuit fixing structure can be applied to battery management systems and other electronic products.

[0070] The above is a detailed introduction to a circuit board fixing structure provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A circuit board fixing structure, characterized in that: include: A housing, the housing comprising side panels and a bottom panel, the side panels forming a receiving cavity on the bottom panel, the receiving cavity being used to place a circuit board; A snap-fit ​​component is arranged in the accommodating cavity, and the snap-fit ​​component includes a connecting portion and a limiting portion. The connecting portion is respectively connected to the bottom plate and the side plate and extends along the first direction, and the limiting portion is connected to an end of the connecting portion away from the bottom plate. After the limiting portion is abutted against the circuit board, the circuit board is limited and fixed.

2. The circuit board fixing structure according to claim 1, wherein: The limiting portion protrudes from the connecting portion and has a first limiting surface facing the bottom plate; The limiting portion also has a first guide surface and a second guide surface connected in sequence, the second guide surface is connected to the first limiting surface, and the circuit board is in contact with the first guide surface and the second guide surface in sequence, so that the side of the circuit board away from the bottom plate is in contact with the first limiting surface.

3. The circuit board fixing structure according to claim 2, wherein: Also includes: A supporting component, comprising: a connecting support portion, the connecting support portion being connected to the bottom plate and extending along a first direction; an extension portion connected to an end of the connecting support portion away from the bottom plate; The connecting support portion protrudes from the extending portion and has a second limiting surface facing the circuit board. The circuit board has a hole passing through along the first direction. The extending portion passes through the hole and abuts the second limiting surface against a surface of the circuit board close to the bottom plate, so that the circuit board is limited and fixed between the first limiting surface and the second limiting surface.

4. The circuit board fixing structure according to claim 3, characterized in that: Also includes: A limiting component, the limiting component comprising: a connecting member, connected to the bottom plate and the connecting support portion respectively and extending along the first direction; an extension member connected to an end of the connecting member facing away from the bottom plate, the extension member having a third guide surface and a fourth limiting surface, the fourth limiting surface facing the extension portion and connected to the third guide surface; The connecting member protrudes from the extending member and has a third limiting surface facing the circuit board. The third limiting surface and the second limiting surface are in the same plane. When the circuit board is limited and fixed between the first limiting surface and the second limiting surface, the third limiting surface and the fourth limiting surface constitute a limiting step to abut and limit the circuit board.

5. The circuit board fixing structure according to claim 3, wherein: Also includes: A support member is connected to the base plate and extends along the first direction. The support member has a fifth limiting surface facing the circuit board, and the fifth limiting surface and the second limiting surface are in the same plane.

6. The circuit board fixing structure according to claim 3, wherein: Also includes: a top plate, the top plate being opposite to the bottom plate in the first direction; A buckle connected to the top plate; A buckle protrusion is provided on a side of the side plate away from the accommodating cavity, and the buckle is engaged with the buckle protrusion to connect the top plate to the shell.

7. The circuit board fixing structure according to claim 6, wherein: Also includes: A limiting member is connected to the top plate and extends in the opposite direction of the first direction. Under the connection between the bottom plate and the shell, one end of the limiting member away from the top plate abuts against one end of the extension portion away from the connecting support portion and protrudes from the extension portion.

8. The circuit board fixing structure according to claim 6, wherein: The side panels have limiting grooves facing the top panel in the second direction, and / or the side panels both have limiting grooves facing the top panel in the third direction; The third direction intersects the first direction and the second direction; The fixed structure further comprises: A limit stop bar is connected to the top plate. When the top plate is connected to the side plate, the limit groove and the limit stop bar are engaged in a one-to-one correspondence to limit the position.

9. The circuit board fixing structure according to claim 6, wherein: Also includes: The stabilizing component includes a first reinforcing component, the first reinforcing component is connected to the top plate, and when the bottom plate is connected to the top plate, the first reinforcing component abuts against a surface of the side plate facing the accommodating cavity.

10. The circuit board fixing structure according to claim 9, wherein: The stabilizing component also includes: multiple second reinforcement members, multiple second reinforcement members are connected to the side of the top plate facing the bottom plate, and multiple second reinforcement members are intersectingly arranged on the top plate, and / or, multiple second reinforcement members are connected to the side of the bottom plate facing the top plate, and multiple second reinforcement members are intersectingly arranged on the bottom plate.

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