A current sensor and a BDU

Abstract

The present invention discloses a current sensor and a BDU, relating to the technical field of automotive BDU. The sensor includes: a sensor body and a floating connection assembly. A connection circuit board is provided on the sensor body. The floating connection assembly includes a male connection block and a female connection block that are cooperatively connected. The male connection block is connected to the connection circuit board, and the female connection block is used to be connected to the main control circuit board of the BDU. Moreover, the male connection block and the female connection block can move relatively back and forth and left and right within a preset range and maintain a reliable electrical connection. The current sensor of the present invention is provided with a floating connection assembly. The floating connection assembly can ensure a stable and reliable electrical connection between the current sensor and the main control circuit board of the BDU under the condition of no mechanical stress, without affecting the reliability of the main control circuit board of the BDU.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive BDU, and particularly to a current sensor and a BDU. Background Art

[0002] BDU (battery disconnect unit) refers to the battery pack disconnect unit, which is an important part of new energy vehicles and provides functions such as charge and discharge control and circuit overload protection for the high-voltage system of new energy vehicles. The current sensor is an important component in the BDU. The current sensor can detect the current in the main circuit of the BDU and is the core guarantee basic data for accurate estimation of battery SOC and SOH.

[0003] The existing current sensor and the main control circuit board of the BDU mainly use male and female terminals with wire harnesses for plugging. However, during the assembly process of the current sensor and the main control circuit board of the BDU, unpredictable large mechanical stresses will be generated. During vehicle driving, due to the ineffective release of mechanical stresses, the reliability of the main control circuit board of the BDU will be affected. Summary of the Invention

[0004] Embodiments of the present invention provide a current sensor and a BDU to solve the technical problem that in the related art, the existing current sensor and the main control circuit board of the BDU are connected by plugging male and female terminals with wire harnesses, which may generate unpredictable large mechanical stresses, thereby affecting the reliability of the main control circuit board of the BDU.

[0005] In a first aspect, a current sensor is provided. The current sensor includes:

[0006] A sensor body, on which a connection circuit board is provided;

[0007] A floating connection component, which includes a male connection block and a female connection block that are cooperatively connected. The male connection block is connected to the connection circuit board, and the female connection block is used to be connected to the main control circuit board of the BDU. Moreover, the male connection block and the female connection block can move relatively back and forth and left and right within a preset range and maintain electrical connection.

[0008] In some embodiments, the male connection block includes a male connection fixed housing, a plurality of male connection terminals, and a male connection floating housing. The fixed ends of the plurality of male connection terminals are fixedly spaced on both sides of the lower end of the male connection fixed housing, and the cantilever ends of the plurality of male connection terminals are spaced inside the male connection floating housing. The male connection floating housing can move back and forth and left and right within a preset range inside the male connection fixed housing;

[0009] The female connection block includes a female connection fixed housing and a plurality of female connection terminals. The fixed ends of the plurality of female connection terminals are fixedly spaced on both sides of the upper end of the female connection fixed housing, and the cantilever ends of the plurality of female connection terminals are spaced inside the female connection fixed housing;

[0010] When the female connection fixed housing is cooperatively connected with the male connection floating housing, the cantilever ends of the plurality of female connection terminals are connected to the cantilever ends of the plurality of male connection terminals one by one.

[0011] In some embodiments, the cantilever end of each male connection terminal includes a bent portion with multiple U-shaped bends and a connecting piece portion extending upward along the end of the bent portion.

[0012] The cantilever end of each female connection terminal includes two oppositely arranged elastic clamping portions for clamping the corresponding connecting piece portion.

[0013] In some embodiments, grooves are provided on both sides inside the male connection floating housing, and wedge-shaped bayonets are provided on both sides of the female connection fixed housing. The two wedge-shaped bayonets are correspondingly matched with the two grooves.

[0014] In some embodiments, positioning posts are provided at the lower end of the male connection fixed housing and the upper end of the female connection fixed housing.

[0015] In a second aspect, a BDU is provided, including:

[0016] A BDU support base provided with a first mounting component and a second mounting component, and there is a preset height difference between the first mounting component and the second mounting component;

[0017] A BDU main control circuit board mounted on the second mounting component;

[0018] A current sensor, which includes:

[0019] A sensor body provided with a connection circuit board, and the sensor body is mounted on the first mounting component;

[0020] A floating connection component, which includes a male connection block and a female connection block that are cooperatively connected. The male connection block is connected to the connection circuit board, and the female connection block is used to be connected to the BDU main control circuit board, and the male connection block and the female connection block can move relatively back and forth and left and right within a preset range and maintain electrical connection.

[0021] In some embodiments, the male connection block includes a male connection fixed housing, a plurality of male connection terminals, and a male connection floating housing. The fixed ends of the plurality of male connection terminals are fixedly spaced on both sides of the lower end of the male connection fixed housing, and the cantilever ends of the plurality of male connection terminals are spaced inside the male connection floating housing. The male connection floating housing can move back and forth and left and right within a preset range inside the male connection fixed housing;

[0022] The female connection block includes a female connection fixed housing and a plurality of female connection terminals. The fixed ends of the plurality of female connection terminals are fixedly spaced on both sides of the upper end of the female connection fixed housing, and the cantilever ends of the plurality of male connection terminals are spaced inside the female connection fixed housing; when the female connection fixed housing is cooperatively connected with the male connection floating housing, the cantilever ends of the plurality of female connection terminals are connected to the cantilever ends of the plurality of male connection terminals in one-to-one correspondence.

[0023] In some embodiments, the cantilever end of each male connection terminal includes a bent portion with multiple U-shaped bends and a connection piece portion extending upward along the end of the bent portion.

[0024] The cantilever end of each female connection terminal is two oppositely arranged elastic clamping portions for clamping the corresponding connection piece portion.

[0025] In some embodiments, the first mounting assembly includes two spaced mounting brackets, both of which are provided with threaded fixing holes, and a plurality of limit posts are arranged around the two mounting brackets.

[0026] In some embodiments, the second mounting assembly includes a plurality of spaced mounting posts, and there is a preset height difference between the plurality of mounting posts and the two mounting brackets.

[0027] The beneficial effects brought by the technical solutions provided by the present invention include:

[0028] An embodiment of the present invention provides a current sensor and a BDU. The current sensor is provided with a floating connection assembly, and the floating connection assembly can ensure a stable and reliable electrical connection between the current sensor and the main control circuit board of the BDU under the condition of no mechanical stress, without affecting the reliability of the main control circuit board of the BDU. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 Schematic diagram of the structure of a current sensor provided by an embodiment of the present invention;

[0031] Figure 2 Schematic diagram of the connection between the male connection block and the sensor body provided by an embodiment of the present invention;

[0032] Figure 3 Schematic diagram of a male connection block provided by an embodiment of the present invention;

[0033] Figure 4 Schematic diagram of a male connection block provided by an embodiment of the present invention;

[0034] Figure 5 Schematic diagram of the connection between the female connection block and the BDU main control circuit board provided by an embodiment of the present invention;

[0035] Figure 6 Schematic diagram of a structure of a female connection block provided by an embodiment of the present invention;

[0036] Figure 7 Another schematic diagram of the structure of a female connection block provided by an embodiment of the present invention;

[0037] Figure 8 Schematic diagram of the structure of a BDU provided by an embodiment of the present invention;

[0038] Figure 9 provided by an embodiment of the present invention Figure 8 a cross-sectional view;

[0039] Figure 10 Electrical connection schematic diagram of a current sensor provided by an embodiment of the present invention;

[0040] In the figure:

[0041] 1. BDU support base; 11. First installation component; 111. Installation support; 112. Limit post; 12. Second installation component; 121. Installation post;

[0042] 2. BDU main control circuit board;

[0043] 3. Current sensor; 31. Sensor body; 32. Floating connection component; 321. Male connection block; 3211. Male connection fixed housing; 3212. Male connection terminal; 32121. Bending part; 32122. Connection piece part; 3213. Male connection floating housing; 32131. Groove; 322. Female connection block; 3221. Female connection fixed housing; 32211. Wedge-shaped bayonet; 3222. Female connection terminal; 32221. Elastic clamping part; 323. Positioning post; 33. Connection circuit board; 34. Temperature sensing element. Detailed implementation manners

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] The embodiments of the present invention provide a current sensor, which can solve the technical problem that when the existing current sensor and the BDU main control circuit board are connected by plugging the male and female terminals with wire harnesses, unpredictable large mechanical stress may be generated during the traditional plugging of the male and female terminals with wire harnesses, thereby affecting the reliability of the BDU main control circuit board.

[0046] See Figure 1 As shown, the embodiments of the present invention provide a current sensor, including: a sensor body 31 and a floating connection assembly 32.

[0047] A connection circuit board 33 is provided on the sensor body 31. The floating connection assembly 32 includes a male connection block 321 and a female connection block 322 that are cooperatively connected. The male connection block 321 is connected to the connection circuit board 33. The female connection block 322 is used to be connected to the BDU main control circuit board 2, and the male connection block 321 and the female connection block 322 can move relative to each other in the front-back and left-right directions within a preset range and maintain electrical connection.

[0048] See Figure 2 、 Figure 3 and Figure 4 As shown, the male connection block 321 includes a male connection fixed housing 3211, a plurality of male connection terminals 3212, and a male connection floating housing 3213. The fixed ends of the plurality of male connection terminals 3212 are fixedly spaced on both sides of the lower end of the male connection fixed housing 3211. The cantilever ends of the plurality of male connection terminals 3212 are spaced inside the male connection floating housing 3213. The male connection floating housing 3213 can move in the front-back and left-right directions within a preset range inside the male connection fixed housing 3211.

[0049] See Figure 5 、 Figure 6 and Figure 7 As shown, the female connection block 322 includes a female connection fixed housing 3221 and a plurality of female connection terminals 3222. The fixed ends of the plurality of female connection terminals 3222 are fixedly spaced on both sides of the lower end of the female connection fixed housing 3221. The cantilever ends of the plurality of female connection terminals 3222 are spaced inside the female connection fixed housing 3221.

[0050] When the female connection fixed housing 3221 and the male connection fixed housing 3211 are cooperatively connected, the cantilever ends of the plurality of female connection terminals 3222 are respectively connected to the cantilever ends of the plurality of male connection terminals 3212.

[0051] Further, referring to Figure 3 and Figure 4 as shown, the cantilever end of each male connection terminal 3212 includes a bending portion 32121 including multiple U-shaped bends and a connection piece portion 32122 extending upward along the end of the bending portion 32121. The plurality of connection piece portions 32122 are arranged at intervals inside the male connection floating housing 3213. There are certain gaps in the front-back and left-right directions between the male connection floating housing 3213 and the male connection fixed housing 3211, that is, the connection piece portions 32122 of the plurality of male connection terminals 3212 and the male connection floating housing 3213 can move in the front-back and left-right directions within a preset range to achieve the floating connection function. Referring to Figure 6 as shown, the cantilever end of each female connection terminal 3222 includes two oppositely arranged elastic clamping portions 32221, and the two elastic clamping portions 32221 are used for clamping the corresponding connection piece portion 32122. Figure 6 In

[0052] The multiple male connection terminals 3212 of the male connection block 321 are connected to the connection circuit board 33, and the multiple female connection terminals 3222 of the female connection block 322 are connected to the BDU main control circuit board 2. When the male connection floating housing 3213 is inserted into the female connection fixed housing 3221, the two elastic clamping portions 32221 of each female connection terminal 3222 clamp the connection piece portion 32122 of the male connection terminal 3212 inside the corresponding male connection floating housing 3213. Since the male connection floating housing 3213 is floating and can move in the front-back and left-right directions within a preset range inside the male connection fixed housing 3211. Therefore, when the male connection floating housing 3213 is inserted into the female connection fixed housing 3221, there will be no large mechanical stress during the insertion between the two, and on the premise of not affecting the reliability of the BDU main control circuit board 2, the electrical connection stability between the current sensor 3 and the BDU main control circuit board 2 can be ensured.

[0053] The current sensor in the embodiment of the present invention is provided with a floating connection component, and the floating connection component can ensure reliable and stable electrical connection between the current sensor and the BDU main control circuit board under the condition of no mechanical stress.

[0054] As an alternative embodiment, in one inventive embodiment, refer to Figure 4 and Figure 6 As shown, on both inner sides of the male connection floating housing 3213, there are provided grooves 32131, and on both sides of the female connection fixed housing 3221, there are provided wedge-shaped bayonets 32211. The two wedge-shaped bayonets 32211 are correspondingly matched with the two grooves 32131, facilitating the mating connection between the male connection floating housing 3213 and the female connection fixed housing 3221.

[0055] As an alternative embodiment, in one inventive embodiment, refer to Figure 3 and Figure 7 As shown, at the lower end of the male connection fixed housing 3211 and the upper end of the female connection fixed housing 3221, there are provided positioning posts 323. The positioning posts 323 facilitate the positioning and welding of the male connection fixed housing 3211 and the female connection fixed housing 3221.

[0056] An embodiment of the present invention provides a BDU, including: a BDU support base 1, a BDU main control circuit board 2, and a current sensor 3.

[0057] The BDU support base 1 is provided with a first mounting component 11 and a second mounting component 12, and there is a preset height difference between the first mounting component 11 and the second mounting component 12. The BDU main control circuit board 2 is mounted on the second mounting component 12.

[0058] The current sensor 3 includes: a sensor body 31 and a floating connection component 32.

[0059] A connection circuit board 33 is provided on the sensor body 31, and the sensor body 31 is mounted on the first mounting component 11.

[0060] The floating connection component 32 includes a male connection block 321 and a female connection block 322 that are cooperatively connected. The male connection block 321 is connected to the connection circuit board 33, the female connection block 322 is connected to the BDU main control circuit board 2, and the male connection block 321 and the female connection block 322 can move relative to each other forward and backward, left and right within a preset range and maintain electrical connection.

[0061] As Figure 8 and Figure 9 As shown, the sensor body 31 is fixed on the first mounting component 11 of the BDU support base 1, the BDU main control circuit board 2 is fixed on the first mounting component 11 of the BDU support base 1, and there is a gap with a preset height difference between the BDU main control circuit board 2 and the connection circuit board 33.

[0062] Refer to Figure 2 、Figure 3 and Figure 4 As shown in Figure 4 , the male connection block 321 includes a male connection fixed housing 3211, a plurality of male connection terminals 3212, and a male connection floating housing 3213. The fixed ends of the plurality of male connection terminals 3212 are fixedly spaced on both sides of the lower end of the male connection fixed housing 3211, and the cantilever ends of the plurality of male connection terminals 3212 are spaced inside the male connection floating housing 3213. The male connection floating housing 3213 can move back and forth and left and right within a preset range inside the male connection fixed housing 3211.

[0063] See Figure 5 、 Figure 6 and Figure 7 As shown in Figure 5 , Figure 6 , and Figure 7 , the female connection block 322 includes a female connection fixed housing 3221 and a plurality of female connection terminals 3222. The fixed ends of the plurality of female connection terminals 3222 are fixedly spaced on both sides of the lower end of the female connection fixed housing 3221, and the cantilever ends of the plurality of female connection terminals 3222 are spaced inside the female connection fixed housing 3221.

[0064] When the female connection fixed housing 3221 is cooperatively connected with the male connection fixed housing 3211, the cantilever ends of the plurality of female connection terminals 3222 are connected to the cantilever ends of the plurality of male connection terminals 3212 in one-to-one correspondence.

[0065] Further, as shown in and

[0065] , the cantilever end of each male connection terminal 3212 includes a bent portion 32121 with multiple U-shaped bends and a connecting piece portion 32122 extending upward along the end of the bent portion 32121. The plurality of connecting piece portions 32122 are spaced inside the male connection floating housing 3213. There are certain gaps both front-back and left-right between the male connection floating housing 3213 and the male connection fixed housing 3211, that is, the connecting piece portions 32122 of the plurality of male connection terminals 3212 and the male connection floating housing 3213 can move back and forth and left and right within a preset range to achieve the floating connection function. See Figure 3 and Figure 4 As shown in Figure 3 and Figure 4 , the cantilever end of each female connection terminal 3222 includes two oppositely arranged elastic clamping portions 32221, and the two elastic clamping portions 32221 are used for clamping the corresponding connecting piece portion 32122. Figure 6 In Figure 6 , the two oppositely arranged elastic clamping portions 32221 of the plurality are arranged in a staggered and spaced manner corresponding to the connecting piece portions 32122. Figure 6

[0066] ​A plurality of male connection terminals 3212 of the male connection block 321 are connected to the connection circuit board 33, and a plurality of female connection terminals 3222 of the female connection block 322 are connected to the BDU main control circuit board 2. When the male connection floating housing 3213 is inserted into the female connection fixed housing 3221, two elastic clamping portions 32221 of each female connection terminal 3222 clamp a connection piece portion 32122 of the male connection terminal 3212 inside the male connection floating housing 3213. Since the male connection floating housing 3213 is floating and can move back and forth and left and right within a preset range in the male connection fixed housing 3211. Therefore, when the male connection floating housing 3213 is inserted into the female connection fixed housing 3221, there will be no large mechanical stress during the insertion between the two, and on the premise of not affecting the reliability of the BDU main control circuit board 2, the electrical connection stability between the current sensor 3 and the BDU main control circuit board 2 can be ensured.

[0067] In the BDU in the embodiment of the present invention, the current sensor is provided with a floating connection component, and the floating connection component can ensure reliable and stable electrical connection between the current sensor and the BDU main control circuit board under the condition of no mechanical stress.

[0068] As an optional implementation manner, in an embodiment of the invention, the fixed ends of the plurality of male connection terminals 3212 are connected to the connection circuit board 33 by reflow soldering or wave soldering, which is convenient for automated processing. The fixed ends of the plurality of female connection terminals 3222 are connected to the BDU main control circuit board 2 by reflow soldering or wave soldering, which is convenient for automated processing.

[0069] As an optional implementation manner, in an embodiment of the invention, refer to Figure 9 As shown, the first mounting component 11 includes two spaced-apart mounting brackets 111, and both of the two mounting brackets 111 are provided with threaded fixing holes. Specifically, through holes are provided at both ends of the current sensor 3, and the through holes correspond to the threaded fixing holes, which is convenient for fixing the current sensor 3 on the mounting brackets 111.

[0070] As an optional implementation manner, in an embodiment of the invention, refer to Figure 8 As shown, a plurality of limit posts 112 are provided around the two mounting brackets 111. The plurality of limit posts 112 can limit the position of the current sensor 3 and further ensure the accuracy of the mounting position.

[0071] As an optional implementation manner, in an embodiment of the invention, refer to Figure 8 and Figure 9As shown, the second mounting assembly 12 includes a plurality of mounting posts 121 arranged at intervals, and there is a preset height difference between the plurality of mounting posts 121 and the two mounting supports 111. The plurality of mounting posts 121 facilitate the fixing of the BDU main control circuit board 2. At the same time, there is a preset height difference between the plurality of mounting posts 121 and the two mounting supports 111, which can ensure that the male connection block 321 and the female connection block 322 have a suitable mating distance, so that the male connection block 321 and the female connection block 322 can move up and down within a preset range to ensure a stress-free environment.

[0072] As an alternative embodiment, in an embodiment of the invention, refer to Figure 1 As shown, a temperature sensing element 34 is provided on the connection circuit board 33. The temperature sensing element 34 can feedback the temperature of the current sensor 3 to ensure the reliability of the use of the current sensor 3. Refer to Figure 1 and Figure 10 As shown, the temperature sensing element 34 is connected through the female connection terminal 3222 of the floating connection assembly 32.

[0073] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. Unless otherwise clearly specified and defined, the terms "mounting", "connecting", "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] It should be noted that in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "including", "comprising" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

[0075] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features of the invention herein.

Claims

1. A BDU, characterized in that: include: A BDU support base (1), wherein the BDU support base (1) is provided with a first mounting component (11) and a second mounting component (12), and a preset height difference is provided between the first mounting component (11) and the second mounting component (12); A BDU main control circuit board (2), wherein the BDU main control circuit board (2) is mounted on the second mounting assembly (12); A current sensor (3), the current sensor (3) comprising: A sensor body (31), wherein a connecting circuit board (33) is provided on the sensor body (31), and the sensor body (31) is mounted on the first mounting assembly (11); A floating connection assembly (32), the floating connection assembly (32) comprising a male connection block (321) and a female connection block (322) which are mutually matched and connected, the male connection block (321) being connected to the connection circuit board (33), the female connection block (322) being used to connect to a BDU main control circuit board (2), and the male connection block (321) and the female connection block (322) being relatively movable forward and backward and left and right within a preset range and maintaining electrical connection; The male connection block (321) comprises a male connection fixed shell (3211), a plurality of male connection terminals (3212) and a male connection floating shell (3213); the fixed ends of the plurality of male connection terminals (3212) are fixed at intervals on both sides of the lower end of the male connection fixed shell (3211); the cantilever ends of the plurality of male connection terminals (3212) are arranged at intervals inside the male connection floating shell (3213); the male connection floating shell (3213) can move forward and backward and left and right within a preset range inside the male connection fixed shell (3211); The female connection block (322) comprises a female connection fixing housing (3221) and a plurality of female connection terminals (3222), the fixed ends of the plurality of female connection terminals (3222) are fixed at intervals on both sides of the upper end of the female connection fixing housing (3221), and the cantilever ends of the plurality of male connection terminals (3212) are arranged at intervals inside the female connection fixing housing (3221); When the female connection fixed housing (3221) is connected in cooperation with the male connection floating housing (3213), the cantilever ends of the plurality of female connection terminals (3222) are connected in a one-to-one correspondence with the cantilever ends of the plurality of male connection terminals (3212); The cantilever end of each male connection terminal (3212) comprises a bent portion (32121) with multiple U-shaped bends and a connecting piece portion (32122) extending upward along the end of the bent portion (32121), and the connecting piece portion (32122) can move forward and backward and left and right within a preset range in the male connection fixed housing (3211); The cantilever end of each female connecting terminal (3222) is two elastic clamping parts (32221) arranged opposite to each other, and the two elastic clamping parts (32221) are used to clamp the corresponding connecting piece part (32122); The first mounting assembly (11) comprises two mounting supports (111) arranged at intervals, and both mounting supports (111) are provided with threaded fixing holes; and both ends of the current sensor (3) are provided with through holes corresponding to the threaded fixing holes; A plurality of limiting columns (112) are arranged around the two mounting supports (111) and are used to limit the position of the current sensor (3); The second mounting assembly (12) comprises a plurality of mounting columns (121) arranged at intervals, and a preset height difference is provided between the plurality of mounting columns (121) and the two mounting supports (111).

2. The BDU according to claim 1, characterized in that: Grooves (32131) are provided on both sides of the interior of the male connection floating shell (3213), and wedge-shaped snap-fits (32211) are provided on both sides of the female connection fixed shell (3221), and the two wedge-shaped snap-fits (32211) correspond to the two grooves (32131).

3. The BDU according to claim 1, characterized in that: The lower end of the male connection fixing housing (3211) and the upper end of the female connection fixing housing (3221) are both provided with positioning columns (323).

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