Electronic device

Abstract

The utility model relates to an electronic device which comprises an upper shell, a lower shell and a printed circuit board, the printed circuit board bears a high-potential conductor and a low-potential conductor which are arranged close to each other, the printed circuit board is provided with a strip-shaped groove between the conductors, and the length of the strip-shaped groove extends beyond the conductors. The upper shell comprises a top wall, a first upper crimping column and a second upper crimping column, the first upper crimping column and the second upper crimping column extend from the top wall to the printed circuit board and abut against the first side face of the printed circuit board, the first upper crimping column is located between the high-potential conductor and the strip-shaped groove, and the second upper crimping column is located between the low-potential conductor and the strip-shaped groove. The lower shell comprises a bottom wall and a first lower crimping column and a second lower crimping column which extend from the bottom wall to the printed circuit board and abut against a second side face of the printed circuit board, the second side face is opposite to the first side face, and the first lower crimping column and the second lower crimping column are arranged opposite to the first upper crimping column and the second upper crimping column respectively; the crimping columns extend beyond the conductor along the length direction of the strip-shaped groove. This can improve creepage and fixation of the printed circuit board.

Description

Technical Field

[0001] This utility model relates to an electronic device, and more particularly to a solution for fixing and creepage of printed circuit boards within an electronic device. Background Technology

[0002] With the development of electronics and intelligence, printed circuit boards (PCBs) have become an indispensable component of electronic devices, used for signal processing and transmission. The secure fixing of PCBs within the housing of electronic devices is crucial. This ensures the normal operation and lifespan of the PCB. If the PCB is not securely fixed within the housing, it may shift when the electronic device is moved or vibrated, potentially leading to broken circuits or short circuits, thus affecting the PCB's normal operation. In cases of significant vibration, electronic components on the PCB may even detach, or the PCB itself may be damaged.

[0003] In addition, ensuring sufficient creepage distance between conductors with potential differences on the printed circuit board (PCB) is also crucial. Insufficient creepage distance can lead to short circuits, localized overheating, and other issues that can affect the normal operation of the PCB. This is especially true when there is a large potential difference between conductors, such as in the battery management system of electric vehicles, where creepage is easily generated, necessitating an increased creepage distance. Increasing the distance between conductors can improve the creepage distance, but this results in a larger PCB size, leading to increased space requirements and higher production costs.

[0004] Therefore, there is a need to optimize the mounting and creepage of printed circuit boards. Utility Model Content

[0005] The purpose of this utility model is to solve at least one of the aforementioned problems and defects in the prior art.

[0006] Therefore, this utility model proposes an electronic device comprising an upper housing, a lower housing, and a printed circuit board. The upper housing and the lower housing are fixed together and house and fix the printed circuit board within the internal space they form. The printed circuit board carries high-potential conductors and low-potential conductors disposed close to each other. The device is characterized by:

[0007] The printed circuit board has a strip-shaped groove between the high-potential conductor and the low-potential conductor, and the strip-shaped groove has a length extending beyond the high-potential conductor and the low-potential conductor;

[0008] The upper housing includes a top wall and a first upper crimp post and a second upper crimp post extending from the top wall toward the printed circuit board and abutting against a first side of the printed circuit board. The first upper crimp post is located between the high-potential conductor and the strip groove, and the second upper crimp post is located between the low-potential conductor and the strip groove.

[0009] The lower housing includes a bottom wall and a first lower pressure post and a second lower pressure post extending from the bottom wall toward the printed circuit board and abutting against a second side surface of the printed circuit board. The second side surface is opposite to the first side surface, and the first lower pressure post and the second lower pressure post are respectively arranged opposite to the first upper pressure post and the second upper pressure post.

[0010] The first upper pressure post, the second upper pressure post, the first lower pressure post, and the second lower pressure post extend beyond the high-potential conductor and the low-potential conductor along the length direction of the strip groove.

[0011] According to this invention, the combination of the strip groove and these crimping posts increases the creepage distance between the high-potential conductor and the low-potential conductor, thus improving the creepage between them. The arrangement of these crimping posts also facilitates the secure fixing of the printed circuit board in a direction perpendicular to the printed circuit board.

[0012] According to a preferred embodiment of the present invention, in a plane perpendicular to the length direction of the strip groove, the first upper pressing post has a first trapezoidal cross section, and the length of the base of the first trapezoid at the top wall is greater than the length of the base abutting the printed circuit board.

[0013] According to a preferred embodiment of the present invention, in a plane perpendicular to the length direction of the strip groove, the second upper pressing post has a cross-section in the shape of a second trapezoid, wherein the length of the base of the second trapezoid at the top wall is greater than the length of the base abutting the printed circuit board.

[0014] According to a preferred embodiment of the present invention, in a plane perpendicular to the length direction of the strip groove, the first lower pressing post has a cross-section in the shape of a third trapezoid, wherein the length of the bottom edge of the third trapezoid at the bottom wall is greater than the length of the bottom edge abutting the printed circuit board.

[0015] According to a preferred embodiment of the present invention, in a plane perpendicular to the length direction of the strip groove, the second lower pressing post has a fourth trapezoidal cross section, wherein the length of the base of the fourth trapezoid at the bottom wall is greater than the length of the base abutting the printed circuit board.

[0016] The aforementioned trapezoidal cross-section crimping post is more conducive to improving creepage and making the crimping and fixing of the printed circuit board more secure.

[0017] According to a preferred embodiment of the present invention, the first trapezoid and the second trapezoid have the same shape, and / or the third trapezoid and the fourth trapezoid have the same shape.

[0018] According to a preferred embodiment of the present invention, the upper housing includes an upper surrounding wall extending along the periphery of the top wall toward the lower housing. A plurality of snap-fit ​​openings are provided at the junction of the top wall and the upper surrounding wall. The lower housing includes a plurality of hooks extending toward the upper housing. The hooks pass through the snap-fit ​​openings and engage with the edges of the snap-fit ​​openings to snap the upper and lower housings together. This provides a simple and easy-to-operate assembly and disassembly scheme.

[0019] According to a preferred embodiment of the present invention, the upper housing includes an upper surrounding wall and a snap-fit ​​wall. The upper surrounding wall extends from the edge of the snap-fit ​​opening at the top wall toward the lower housing. The portion of the upper surrounding wall at the snap-fit ​​opening forms the snap-fit ​​wall. The lower housing includes a lower peripheral wall extending along the periphery of the bottom wall toward the upper housing. The lower peripheral wall is recessed into the internal space at the snap hook to form a lower surrounding wall. The upper surrounding wall is accommodated within the recess formed by the lower surrounding wall. The snap hook extends from the lower surrounding wall, passes through the channel formed by the upper surrounding wall and the snap-fit ​​wall, and snaps onto the edge of the snap-fit ​​wall. This makes the snap hook less prone to loosening.

[0020] According to a preferred embodiment of the present invention, the lower housing includes a positioning post, the upper housing includes a positioning hole, and the printed circuit board includes a through hole, with the positioning post passing through the through hole and receiving in the positioning hole. This facilitates the positioning of the upper housing, lower housing, and printed circuit board.

[0021] According to a preferred embodiment of the present invention, the upper housing includes upper reinforcing ribs on the inner surface of the top wall, and / or the lower housing includes lower reinforcing ribs on the inner surface of the bottom wall. This improves the strength of the upper housing and / or the lower housing. Attached Figure Description

[0022] The present invention will now be described in detail with reference to the accompanying drawings and through non-limiting embodiments, wherein:

[0023] Figure 1 An exploded perspective view of an electronic device according to an embodiment of the present invention is shown schematically.

[0024] Figure 2 Schematic illustration from another direction Figure 1 Another exploded perspective view of the electronic device shown;

[0025] Figure 3 yes Figure 1 A three-dimensional view of the electronic device in its assembled state;

[0026] Figure 4 yes Figure 3 The top view of the electronic device shown shows the cutting lines AA and BB.

[0027] Figure 5 yes Figure 3 The front view of the electronic device shown, viewed from the front, shows the section line CC;

[0028] Figure 6 yes Figure 1 A perspective view of the upper housing of the electronic device shown, illustrating the internal structure of the upper housing;

[0029] Figure 7 yes Figure 1 A perspective view of the lower housing of the electronic device shown, illustrating the internal structure of the lower housing;

[0030] Figure 8 It is along Figure 4 A cross-sectional view of the section line AA in the diagram;

[0031] Figure 9 It is along Figure 4 A cross-sectional view of the section line BB in the diagram;

[0032] Figure 10 It is along Figure 5 A cross-sectional view of section line CC, showing an enlarged portion D;

[0033] Figure 11 yes Figure 10 Enlarged view of part D in the image.

[0034] The accompanying drawings are schematic only and are not necessarily drawn to scale. Furthermore, they only show those parts necessary to illustrate the present invention, while other parts may be omitted or simply mentioned. That is, the present invention may include other parts besides those shown in the drawings. Detailed Implementation

[0035] Embodiments of the present invention will now be described with reference to the accompanying drawings. In the following description, numerous specific details are set forth to enable those skilled in the art to gain a more complete understanding of the present invention. However, it will be apparent to those skilled in the art that implementations of the present invention may not include some of these specific details. Furthermore, it should be understood that the present invention is not limited to the specific embodiments described. Rather, the present invention may be practiced with any combination of the following features and elements, regardless of whether they relate to different embodiments. Therefore, the following features, embodiments, and advantages are for illustrative purposes only and should not be construed as elements or limitations of the claims unless expressly set forth in the claims.

[0036] The descriptions of orientation used in the following description, such as "upper," "lower," "top," and "bottom," are for convenience only unless explicitly stated otherwise and are not intended to limit the scope of this invention. Furthermore, the terms "first," "second," "third," and "fourth" are used herein to describe components or parts; these terms are used only to distinguish individual components or parts and are not intended to limit the order or number of these components or parts.

[0037] Figure 1 and Figure 2 An exploded perspective view of an electronic device 100 according to an embodiment of the present invention is shown schematically from the top and bottom. Figure 3 This is a perspective view of the electronic device 100 in its assembled state. The electronic device 100 could be, for example, a battery management system for an electric vehicle. However, it should be understood that this invention is also applicable to any other electronic device that includes a printed circuit board.

[0038] like Figure 1 and Figure 2 As shown, the electronic device 100 includes an upper housing 1, a lower housing 2, and a printed circuit board 3. The printed circuit board 3 carries an interface component 4 for connection to an external circuit. The printed circuit board 3 is housed within an internal space formed by the upper housing 1 and the lower housing 2, and is fixed within the internal space by means of a fixing between the upper housing 1 and the lower housing 2.

[0039] like Figure 1 and Figure 2 As shown, the upper housing 1 includes a top wall 10 and a peripheral wall 10' extending along the periphery of the top wall 10 toward the lower housing 2. A plurality of snap-fit ​​openings 11 are provided at the junction of the top wall 10 and the peripheral wall 10'. The lower housing 2 includes a bottom wall 20 and a lower peripheral wall 20' extending along the periphery of the bottom wall 20 toward the upper housing 1. The lower housing 2 also includes a plurality of hooks 21 extending toward the upper housing 1. Figure 3As shown, the hook 21 passes through the corresponding snap-fit ​​opening 11 and snaps onto the edge of the snap-fit ​​opening 11 to snap the upper housing 1 and the lower housing 2 together. For ease of operation of the hook 21, as shown... Figure 1 and Figure 3 As shown, a stepped portion is provided at the snap-fit ​​opening 11 where the top wall 10 and the upper wall 10' meet. In the embodiment shown in the figure, eight sets of snap-fit ​​openings 11 and snap hooks 21 are shown. However, it should be understood that more or fewer snap-fit ​​openings 11 and snap hooks 21 are also feasible, and the upper housing 1 and the lower housing 2 can also be fixed together by other means, such as screw connection. The snap-fit ​​fixing between the upper housing 1 and the lower housing 2 will be described in more detail below.

[0040] like Figure 1 As shown, the printed circuit board 3 carries a high-potential conductor 33 and a low-potential conductor 34 disposed close to each other. Creepage can easily occur between the high-potential conductor 33 and the low-potential conductor 34. To improve the creepage between the high-potential conductor 33 and the low-potential conductor 34, the printed circuit board 3 has a slot 35 formed between the high-potential conductor 33 and the low-potential conductor 34. Advantageously, the slot 35 has a length extending beyond the high-potential conductor 33 and the low-potential conductor 34 to avoid creepage around the slot 35.

[0041] To further improve the creepage distance between the high-potential conductor 33 and the low-potential conductor 34, strip-shaped crimping posts are provided on the upper housing 1 and the lower housing 2, respectively. These crimping posts abut against the printed circuit board 3 and are respectively arranged between the high-potential conductor 33 and the strip groove 35 and between the low-potential conductor 34 and the strip groove 35, thereby increasing the creepage distance between the high-potential conductor 33 and the low-potential conductor 34.

[0042] Specifically, such as Figure 1 , Figure 2 and Figure 6 As shown, the upper housing 1 includes a first upper crimp post 13 and a second upper crimp post 14. The first upper crimp post 13 and the second upper crimp post 14 extend from the top wall 10 toward the printed circuit board 3 and abut against the first side 30 of the printed circuit board 3. The first upper crimp post 13 is located between the high-potential conductor 33 and the strip groove 35, and the second upper crimp post 14 is located between the low-potential conductor 34 and the strip groove 35.

[0043] like Figure 1 , Figure 2 and Figure 7As shown, the lower housing 2 includes a first lower pressure post 23 and a second lower pressure post 24, which extend from the bottom wall 20 toward the printed circuit board 3 and abut against the second side surface 30' of the printed circuit board 3. The second side surface 30' is opposite to the first side surface 30. The first lower pressure post 23 and the second lower pressure post 24 are respectively arranged opposite to the first upper pressure post 13 and the second upper pressure post 14.

[0044] Advantageously, the first upper crimp post 13, the second upper crimp post 14, the first lower crimp post 23, and the second lower crimp post 24 extend along the length of the strip 35 beyond the high-potential conductor 33 and the low-potential conductor 34 to avoid creepage around these crimp posts.

[0045] Figure 8 Electronic device 100 is shown along Figure 4 The cross-sectional view along section line AA, that is, the cross-sectional view passing through the first upper crimping post 13, the second upper crimping post 14, the strip groove 35, the first lower crimping post 23, and the second lower crimping post 24. (See diagram below.) Figure 8 As shown, in a plane perpendicular to the length direction of the strip 35 of the printed circuit board 3, the first upper pressing post 13 has a first trapezoidal cross-section, the length of the base of the first trapezoid at the top wall 10 is greater than the length of the base of the first trapezoid abutting the printed circuit board 3; the second upper pressing post 14 has a second trapezoidal cross-section, the length of the base of the second trapezoid at the top wall 10 is greater than the length of the base of the second trapezoid abutting the printed circuit board 3; the first lower pressing post 23 has a third trapezoidal cross-section, the length of the base of the third trapezoid at the bottom wall 20 is greater than the length of the base of the third trapezoid abutting the printed circuit board 3; the second lower pressing post 24 has a fourth trapezoidal cross-section, the length of the base of the fourth trapezoid at the bottom wall 20 is greater than the length of the base of the fourth trapezoid abutting the printed circuit board 3. With this arrangement, the creepage trajectory is as follows: Figure 8 As indicated by the middle arrow.

[0046] from Figure 8 It can be clearly seen that, compared with the case where the strip groove 35 and the first upper pressure post 13, the second upper pressure post 14, the first lower pressure post 23 and the second lower pressure post 24 are not provided, the creepage distance between the high-potential conductor 33 and the low-potential conductor 34 is significantly increased in this utility model. For example... Figure 8 As shown, the first upper crimping post 13, the second upper crimping post 14, the first lower crimping post 23, and the second lower crimping post 24 are hollow, and their wall thickness is basically the same as that of the other parts of the upper shell 1 and the lower shell 2. However, it should be understood that they can also be solid.

[0047] In addition, these trapezoidal crimping posts allow for a more secure crimping between the upper housing 1 and the lower housing 2 and the printed circuit board 3.

[0048] Preferably, the first and second trapezoids have the same shape, and the third and fourth trapezoids have the same shape. More preferably, the first, second, third, and fourth trapezoids are isosceles trapezoids. However, it should be understood that the first upper pressing post 13, the second upper pressing post 14, the first lower pressing post 23, and the second lower pressing post 24 may also have other suitable cross-sectional shapes.

[0049] Additionally, additional pressure posts can be provided on the upper housing 1 and / or the lower housing 2 to more securely fix the printed circuit board 3 in a direction perpendicular to the printed circuit board 3. For example, as Figure 7 As shown, a plurality of additional cylindrical crimping posts 27 are also provided on the lower housing 2. Although not shown, advantageously, additional crimping posts corresponding to the crimping posts 27 can be provided on the upper housing 1.

[0050] To facilitate the assembly of the upper housing 1, lower housing 2, and printed circuit board 3, such as Figure 1 and Figure 2 As shown, a positioning hole 16 is provided on the upper housing 1, and a positioning post 26 is provided on the lower housing 2. The positioning post 26 can be received within the positioning hole 16. Preferably, two sets of positioning holes 16 and positioning posts 26 are provided. Preferably, the positioning post 26 can also pass through the through hole 36 on the printed circuit board 3 to prevent the printed circuit board 3 from shifting within the plane of the printed circuit board 3. In addition, to avoid the positioning post 26 being too long and easily damaged, such as... Figure 2 and Figure 6 As shown, the positioning hole 16 can be set inside the cylindrical member 16'.

[0051] To increase the strength of the upper shell 1, such as Figure 6 As shown, upper reinforcing ribs 18 are provided on the inner surface of the top wall 10 of the upper shell 1. The upper reinforcing ribs 18 are hexagonal in shape and interconnected. Similarly, to increase the strength of the lower shell 2, as shown... Figure 7 As shown, a lower reinforcing rib 28 is provided on the inner surface of the bottom wall 20 of the lower housing 2. The lower reinforcing ribs 28 are also hexagonal in shape and interconnected with each other. It should be understood that the upper reinforcing rib 18 or the lower reinforcing rib 28 can also take any other suitable form.

[0052] The following is for reference. Figure 3 , Figure 6 , Figure 7 , Figures 9 to 11 Describe in detail the snap-fit ​​fixing between the upper housing 1 and the lower housing 2. For example... Figure 3 , Figure 6 , Figure 9 , Figure 11As shown, the upper housing 1 includes an upper surrounding wall 110 and a snap-fit ​​wall 111. The upper surrounding wall 110 extends from the edge of the snap-fit ​​opening 11 at the top wall 10 toward the lower housing 2, and the portion of the upper wall 10' at the snap-fit ​​opening 11 forms the snap-fit ​​wall 111. The upper surrounding wall 110 includes a first upper sidewall 112 parallel to the snap-fit ​​wall 111 and a second upper sidewall 113 and a third upper sidewall 114 perpendicular to the snap-fit ​​wall 111 and connecting the first upper sidewall 112 and the snap-fit ​​wall 111. The first upper sidewall 112 is shorter than the second upper sidewall 113 and the third upper sidewall 114 (e.g., ...). Figure 6 As shown), to allow the connecting portion 211 of the hook 21 described below to pass through (as shown). Figure 9 (As shown).

[0053] like Figure 7 , Figure 9 , Figure 11 As shown, the lower peripheral wall 20' is recessed into the interior space of the electronic device 100 at the hook to form a lower surrounding wall 220. The hook 21 extends from the lower surrounding wall 220. Specifically, the lower surrounding wall 220 includes a first lower side wall 222 parallel to the corresponding lower peripheral wall 20' and a second lower side wall 223 and a third lower side wall 224 perpendicular to the first lower side wall 222 and connecting the first lower side wall 222 and the corresponding lower peripheral wall 20'.

[0054] like Figure 7 and Figure 9 As shown, the hook 21 includes a connecting portion 211 extending from the first lower sidewall 222 of the lower enclosure wall 220, a body portion 212 extending substantially perpendicularly to the connecting portion 211 toward the upper housing 1, and a hook portion 213 extending from the body portion 212 toward the outside of the electronic device 100. A gap exists between the hook portion 213 and the second lower sidewall 223 and the third lower sidewall 224 of the lower enclosure wall 220 to allow the second upper sidewall 113 and the third upper sidewall 114 of the upper enclosure wall 110 of the upper housing 1 to pass through.

[0055] When the upper housing 1 and the lower housing 2 are snapped together and fixed, as follows: Figure 6 , Figure 7 , Figure 9 and Figure 11 As shown, the upper enclosure wall 110 of the upper housing 1 is accommodated within the recess formed by the lower enclosure wall 220 of the lower housing 2, and the body portion 212 of the hook 21 is accommodated within the channel formed by the upper enclosure wall 110 and the engaging wall 111 of the upper housing 1. As the upper housing 1 and the lower housing 2 are engaged and positioned, the hook portion 213 of the hook 21 engages with the edge of the engaging wall 111. This structure makes the hook 21 less prone to loosening.

[0056] like Figure 11Specifically shown, the upper surrounding wall 110 and the lower surrounding wall 220 form a generally rectangular shape. However, it should be understood that they can also form any other suitable shape, such as an arc shape.

[0057] While the present invention has been disclosed above with reference to preferred embodiments, it is not limited thereto. Any variations and modifications made by those skilled in the art without departing from the spirit and scope of the present invention should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope defined in the claims.

Claims

1. An electronic device (100) comprising an upper housing (1), a lower housing (2) and a printed circuit board (3), said upper housing (1) and said lower housing (2) being fixed to each other and housing and fixing said printed circuit board (3) in an internal space formed by them, said printed circuit board (3) carrying a high potential conductor (33) and a low potential conductor (34) disposed close to each other, characterized in that: said printed circuit board (3) is provided with a strip-shaped slot (35) between said high potential conductor (33) and said low potential conductor (34), said strip-shaped slot (35) having a length extending beyond said high potential conductor (33) and said low potential conductor (34); said upper housing (1) comprises a top wall (10) and a first upper crimping post (13) and a second upper crimping post (14) extending from said top wall (10) towards said printed circuit board (3) and abutting against a first side (30) of said printed circuit board (3), said first upper crimping post (13) being located between said high potential conductor (33) and said strip-shaped slot (35), said second upper crimping post (14) being located between said low potential conductor (34) and said strip-shaped slot (35); said lower housing (2) comprises a bottom wall (20) and a first lower crimping post (23) and a second lower crimping post (24) extending from said bottom wall (20) towards said printed circuit board (3) and abutting against a second side (30') of said printed circuit board (3), said second side (30') being opposite to said first side (30), said first lower crimping post (23) and said second lower crimping post (24) being arranged opposite to said first upper crimping post (13) and said second upper crimping post (14), respectively; said first upper crimping post (13), said second upper crimping post (14), said first lower crimping post (23) and said second lower crimping post (24) extend along the length direction of said strip-shaped slot (35) beyond said high potential conductor (33) and said low potential conductor (34).

2. The electronic device (100) according to claim 1, characterized in that said first upper crimping post (13) has a cross section in a plane perpendicular to the length direction of said strip-shaped slot (35) in the shape of a first trapezoid, the length of the base at said top wall (10) being greater than the length of the base abutting against said printed circuit board (3).

3. The electronic device (100) according to claim 2, characterized in that said second upper crimping post (14) has a cross section in a plane perpendicular to the length direction of said strip-shaped slot (35) in the shape of a second trapezoid, the length of the base at said top wall (10) being greater than the length of the base abutting against said printed circuit board (3).

4. The electronic device (100) according to claim 3, characterized in that said first lower crimping post (23) has a cross section in a plane perpendicular to the length direction of said strip-shaped slot (35) in the shape of a third trapezoid, the length of the base at said bottom wall (20) being greater than the length of the base abutting against said printed circuit board (3).

5. The electronic device (100) according to claim 4, characterized in that In a plane perpendicular to the length direction of the strip-shaped groove (35), the second lower crimping post (24) has a fourth trapezoidal cross section, the length of the bottom side at the bottom wall (20) being greater than the length of the bottom side against the printed circuit board (3).

6. The electronic device (100) according to claim 5, characterized by The first trapezoid and the second trapezoid have the same shape, and / or the third trapezoid and the fourth trapezoid have the same shape.

7. The electronic device (100) according to any one of claims 1 to 6, characterized in that The upper shell (1) comprises an upper peripheral wall (10') extending along the periphery of the top wall (10) towards the lower shell (2), a plurality of clamping openings (11) being provided at the position where the top wall (10) and the upper peripheral wall (10') meet, and the lower shell (2) comprises a plurality of clamping hooks (21) extending towards the upper shell (1), the clamping hooks (21) passing through the clamping openings (11) and clamping on the edges of the clamping openings (11) to clamp the upper shell (1) and the lower shell (2) together.

8. The electronic device (100) according to claim 7, characterized in that The upper shell (1) comprises an upper surrounding wall (110) extending from the edges of the clamping openings (11) at the top wall (10) towards the lower shell (2), and a clamping wall (111) formed by the part of the upper peripheral wall (10') at the clamping openings (11), and the lower shell (2) comprises a lower peripheral wall (20') extending along the periphery of the bottom wall (20) towards the upper shell (1), the lower peripheral wall (20') being recessed towards the interior space at the clamping hooks (21) to form a lower surrounding wall (220), the upper surrounding wall (110) being accommodated in the recess formed by the lower surrounding wall (220), and the clamping hooks (21) extending out of the lower surrounding wall (220), passing through the passage surrounded by the upper surrounding wall (110) and the clamping wall (111), and clamping on the edges of the clamping wall (111).

9. The electronic device (100) according to claim 7, characterized in that The lower shell (2) comprises a positioning post (26), the upper shell (1) comprises a positioning hole (16), and the printed circuit board (3) comprises a through hole (36), the positioning post (26) being received in the positioning hole (16) through the through hole (36).

10. The electronic device (100) according to claim 7, characterized in that The upper shell (1) comprises an upper reinforcing rib (18) on the inner surface of the top wall (10), and / or the lower shell (2) comprises a lower reinforcing rib (28) on the inner surface of the bottom wall (20).

Images