BDU, welding tool and using method of welding tool

Abstract

The invention discloses a BDU, a welding tool and a using method of the welding tool, and belongs to the technical field of BDU manufacturing. The BDU comprises a bottom shell, a plurality of busbars, a BDU mainboard, a plurality of first connecting insertion pieces, a main loop positive relay and a main loop negative relay, the busbars are arranged on the bottom shell, the BDU mainboard is arranged on the bottom shell, the first connecting insertion pieces are arranged on the BDU mainboard, and the main loop negative relay is arranged on the BDU mainboard. The first end of each first connecting insertion piece is correspondingly welded with one busbar, the second end of each first connecting insertion piece is correspondingly inserted into one welding hole of the BDU mainboard and welded, the main loop positive relay and the main loop negative relay are connected with the bottom shell, and the main loop positive relay and the main loop negative relay are each provided with at least one second connecting insertion piece; and each second connecting insertion sheet is inserted into one welding hole of the BDU main board and is welded. The high-voltage sampling loop of the BDU and the BDU mainboard are directly welded through the multiple first connecting insertion pieces, the relay low-voltage control loop and the BDU mainboard are directly welded through the multiple second connecting insertion pieces, wiring harnesses are not needed, space is not occupied, and the anti-interference capacity is high.

Description

Technical Field

[0001] The present invention relates to the technical field of BDU manufacturing, and particularly to a BDU, a welding tooling and a using method of the welding tooling. Background Art

[0002] The BDU (Battery Disconnect Unit) battery pack disconnection unit is designed specifically for the inside of the battery pack and is a type of high-voltage power distribution box. The BDU generally includes the following components:

[0003] 1. A main circuit relay for turning on / off the main circuit DC current of the battery pack;

[0004] 2. A pre-charge relay for protecting the high-voltage circuit from the impact of instantaneous large current during system power-on;

[0005] 3. A current sensor (shunt) for measuring and calculating the battery pack capacity.

[0006] The BDU configures main relays at the total positive and total negative of the battery pack to provide high-voltage DC supply to the high-voltage components of the system. In addition, the main relay can input current to the battery pack during charging or current feedback. When the system reports an error, the battery system cuts off the current through the main relay based on the command of the vehicle control unit to ensure system safety.

[0007] In the prior art, the relay low-voltage control circuit and the high-voltage sampling circuit of the BDU are connected to the BDU main board by wire harnesses, which have the technical problems of complex assembly, occupying space, and weak anti-interference ability. Summary of the Invention

[0008] Embodiments of the present invention provide a BDU, a welding tooling and a using method of the welding tooling to solve the technical problems in the related art that the relay low-voltage control circuit and the high-voltage sampling circuit of the existing BDU are connected to the BDU main board by wire harnesses, resulting in complex assembly, occupying space, and weak anti-interference ability.

[0009] In a first aspect, a BDU is provided, and the BDU (1) includes:

[0010] A bottom housing;

[0011] A plurality of bus bars provided on the bottom housing;

[0012] A BDU main board provided on the bottom housing;

[0013] A plurality of first connection inserts, wherein the first end of each first connection insert is welded to a corresponding bus bar, and the second end is inserted into and welded to a welding hole of the BDU main board;

[0014] The main circuit positive relay and the main circuit negative relay are connected to the bottom housing. At least one second connection tab is provided on each of the main circuit positive relay and the main circuit negative relay, and each second connection tab is inserted into and welded to a welding hole of the BDU main board.

[0015] In some embodiments, both ends of the shunt of the BDU are connected to the two bus bars. A plurality of connection pins are provided in the middle of the shunt, and each connection pin is correspondingly inserted into and welded to a welding hole of the BDU main board.

[0016] In some embodiments, the pre-charge relay and the heating relay of the BDU are provided with at least one third connection tab, and each third connection tab is correspondingly inserted into and welded to a welding hole of the BDU main board.

[0017] In some embodiments, a buffer pad is provided on the side of the pre-charge relay and the heating relay facing away from the BDU main board.

[0018] In some embodiments, the first connection tab is Z-shaped, L-shaped or vertical. An installation hole is provided in the middle of each first connection tab, and the installation hole cooperates with a positioning post of the bottom housing.

[0019] In some embodiments, all the bus bars and the bottom housing are injection-molded to form an integral structure.

[0020] In a second aspect, a welding tool for the BDU is provided. The welding tool includes:

[0021] A base for supporting the bottom housing;

[0022] A correction plate. The base is used to abut against the bottom housing, and correction holes corresponding to the second ends of each first connection tab are provided on the correction plate;

[0023] Two pushing components are provided on both sides of the base. The two pushing components are used to push the correction plate and the bottom housing to fit closely;

[0024] A pressing component is provided in the middle of the base. The pressing component is used to press and fit the first ends of the plurality of first connection tabs and the corresponding plurality of bus bars.

[0025] In some embodiments, the pressing component includes:

[0026] A support column provided on the base;

[0027] A rotating rod, the first end of which is rotatably connected to the top end of the support column;

[0028] A fixing rod, which is fixed to the second end of the rotating rod;

[0029] A plurality of pressing columns, which are arranged on the fixing rod at intervals, and one end of each pressing column is used to press and fit the first end of one of the first connecting inserts with a corresponding bus bar;

[0030] A locking member, which is arranged at the rotating connection between the rotating rod and the support column.

[0031] In some embodiments, clamping blocks are arranged on both sides of the correction plate.

[0032] In a third aspect, a method of using a welding tooling is provided, including the following steps:

[0033] Install the bottom housing together with a plurality of bus bars on the base, place a plurality of first connecting inserts on the plurality of bus bars in one-to-one correspondence, and use a pressing assembly to press and fit the first ends of the plurality of first connecting inserts with the corresponding plurality of bus bars;

[0034] Abut the correction plate against the bottom housing, and make the plurality of correction holes on the correction plate correspond to the second ends of the plurality of first connecting inserts one by one, and use two pushing assemblies to push and fit the correction plate and the bottom housing;

[0035] Disconnect the pressing assembly from the plurality of first connecting inserts, weld the first ends of the plurality of first connecting inserts to a bus bar correspondingly, and then use the pressing assembly to press and fit the first ends of the plurality of first connecting inserts with the corresponding plurality of bus bars;

[0036] Unlock the two pushing assemblies and remove the correction plate, place the BDU main board on the bottom housing, and insert the second end of each first connecting insert into a welding hole of the BDU main board and weld it.

[0037] The beneficial effects brought by the technical solution provided by the present invention include:

[0038] The embodiment of the present invention provides a BDU, a welding tooling and a method of using the welding tooling. The bus bar of the BDU is directly welded to the BDU main board through the first connecting insert, that is, the high-voltage sampling circuit and the BDU main board are directly welded by using a plurality of first connecting inserts. The main circuit positive relay and the main circuit negative relay are directly welded to the BDU main board through the second connecting insert, that is, the relay low-voltage control circuit and the BDU main board are directly welded by using a plurality of second connecting inserts. No wire harness is required, the assembly is simple, the space is not occupied, and the anti-interference ability is strong. Description of the Drawings

[0039] 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 drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0040] Figure 1 Structural schematic diagram of a BDU provided by an embodiment of the present invention;

[0041] Figure 2 Structural schematic diagram of a BDU (without the bottom housing) provided by an embodiment of the present invention;

[0042] Figure 3 Structural schematic diagram of the connection between the main circuit positive relay and the BDU main board provided by an embodiment of the present invention;

[0043] Figure 4 Circuit schematic diagram of a BDU provided by an embodiment of the present invention;

[0044] Figure 5 Structural schematic diagram of the connection between the shunt and the BDU main board provided by an embodiment of the present invention;

[0045] Figure 6 Another structural schematic diagram of a BDU (without the bottom housing) provided by an embodiment of the present invention;

[0046] Figure 7 Structural schematic diagram of the cooperation between the first connection insert and the bottom housing provided by an embodiment of the present invention;

[0047] Figure 8 Structural schematic diagram of the first connection insert provided by an embodiment of the present invention;

[0048] Figure 9 Structural schematic diagram of a welding tooling provided by an embodiment of the present invention;

[0049] Figure 10 Provided by an embodiment of the present invention Figure 9 Partial enlarged view of;

[0050] Figure 11 Another structural schematic diagram of a welding tooling provided by an embodiment of the present invention;

[0051] Reference numerals:

[0052] 1. BDU; 11. Bottom housing; 1101. Positioning post; 12. Busbar; 13. BDU main board; 14. First connection tab; 1401. Mounting hole; 15. Main circuit positive relay; 1501. Second connection tab; 16. Main circuit negative relay; 17. Shunt; 1701. Connection pin; 18. Precharge relay; 1801. Third connection tab; 1802. Buffer pad; 19. Heating relay;

[0053] 2. Welding tooling; 21. Base; 22. Rectifying plate; 2201. Rectifying hole; 2202. Clamping block; 23. Thrust assembly; 24. Pressing assembly; 2401. Support column; 2402. Rotating rod; 2403. Fixed rod; 2404. Pressing column; 2405. Locking part. Detailed implementation manner

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below 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.

[0055] The embodiments of the present invention provide a BDU, which can solve the technical problems that the relay low-voltage control circuit and the high-voltage sampling circuit of the existing BDU are connected to the BDU main board by wire harnesses, resulting in complex assembly, large space occupation, and weak anti-interference ability.

[0056] See Figure 1 and Figure 2 As shown in, the embodiments of the present invention provide a BDU, and the BDU 1 includes: a bottom housing 11, a plurality of busbars 12, a BDU main board 13, a plurality of first connection tabs 14, a main circuit positive relay 15, and a main circuit negative relay 16.

[0057] The plurality of busbars 12 are arranged on the bottom housing 11, the BDU main board 13 is arranged on the bottom housing 11, the first end of each first connection tab 14 is correspondingly welded to one busbar 12, and the second end is correspondingly inserted into a welding hole of the BDU main board 13 and welded.

[0058] The main circuit positive relay 15 and the main circuit negative relay 16 are connected to the bottom housing 11, and at least one second connection tab 1501 ( Figure 3 as shown) is provided on each of the main circuit positive relay 15 and the main circuit negative relay 16, and each second connection tab 1501 is inserted into a welding hole of the BDU main board 13 and welded.

[0059] See Figure 2 and Figure 4 As shown, the #1 first connection insert is laser welded to the #1 bus bar, and the #1 first connection insert is for pack + sampling; the #2 first connection insert is laser welded to the #2 bus bar, and the #2 first connection insert is for fuse + sampling; the #3 first connection insert is laser welded to the #3 bus bar, and the #3 first connection insert is for link + sampling; the #4 first connection insert is laser welded to the #4 bus bar, and the #4 first connection insert is for link - sampling; the #5 first connection insert is laser welded to the #6 bus bar, and the #5 first connection insert is for pack - sampling; a main fuse is connected between the #1 bus bar and the #2 bus bar, a main circuit positive relay 15 is connected between the #2 bus bar and the #3 bus bar, a main circuit negative relay 16 is connected between the #4 bus bar assembly and the #6 bus bar, and a shunt 17 is connected between the #6 bus bar and the #5 bus bar, forming the main positive circuit and the main negative circuit of the BDU.

[0060] In the BDU in the embodiment of the present invention, the bus bar is directly welded to the BDU main board through the first connection insert, that is, the high - voltage sampling circuit and the BDU main board are directly welded by using a plurality of first connection inserts. The main circuit positive relay and the main circuit negative relay are directly welded to the BDU main board through the second connection insert, that is, the relay low - voltage control circuit and the BDU main board are directly welded by using a plurality of second connection inserts. No wire harness is required, the assembly is simple, it does not occupy space, and the anti - interference ability is strong.

[0061] As an optional implementation manner, in an invention implementation, see Figure 2 and Figure 5 As shown, both ends of the shunt 17 of the BDU are connected to the two bus bars 12. A plurality of connection pins 1701 are provided in the middle of the shunt 17, and the plurality of connection pins 1701 are correspondingly inserted into and welded to a plurality of welding holes of the BDU main board 13. The shunt 17 is directly inserted into the BDU main board 13 for welding, and there is no need to use male - female terminal connection or wire harness connection.

[0062] As an optional implementation manner, in an invention implementation, see Figure 2 and Figure 6 As shown, for the pre - charge relay 18 and the heating relay 19 of the BDU, at least one third connection insert 1801 is provided on the pre - charge relay 18 and the heating relay 19, and each third connection insert 1801 is correspondingly inserted into and welded to a welding hole of the BDU main board 13.

[0063] Further, see Figure 6As shown, a buffer pad 1802 is provided on the side of the precharge relay 18 and the heating relay 19 facing away from the BDU main board 13. The buffer pad 1802 absorbs and alleviates the stress of the BDU main board 13 when vibrating and impacting in this direction. At least 5 mm of structural adhesive is provided around the precharge relay 18 and the heating relay 19 to reduce the stress of the BDU main board 13.

[0064] As an alternative embodiment, in an invention implementation, refer to Figure 7 and Figure 8 As shown, the first connection tab 14 is Z-shaped, L-shaped or vertical. An installation hole 1401 is provided in the middle of each first connection tab 14. The installation hole 1401 cooperates with a positioning post 1101 of the bottom shell 11 to facilitate the positioning and installation of the first connection tab 14.

[0065] As an alternative embodiment, in an invention implementation, all the busbars 12 and the bottom shell 11 are injection molded to form an integral structure. The bottoms of all the busbars 12 are on the same plane, and an insulating film and a heat-conducting pad can be added to the busbars.

[0066] Considering that it is not allowed to open too large welding holes on the BDU main board 13 (too large welding holes will cause insufficient solder and defects, and may break when the BDU main board 13 vibrates and impacts), refer to Figure 9 As shown, an embodiment of the present invention also provides a welding tooling for welding the aforementioned BDU. The welding tooling 2 includes: a base 21, a correction plate 22, two pushing components 23 and a pressing component 24.

[0067] The base 21 is used to support the bottom shell 11. The base 21 is used to abut against the bottom shell 11. The correction plate 22 is provided with correction holes 2201 corresponding one by one to the second ends of the plurality of first connection tabs 14. Among them, the correction holes 2201 are trumpet-shaped and face the second ends of the first connection tabs 14 to facilitate the insertion of the second ends of the first connection tabs 14 into the corresponding correction holes 2201.

[0068] The two pushing components 23 are arranged on both sides of the base 21. The two pushing components 23 are used to push the correction plate 22 and the bottom shell 11 to fit together.

[0069] The pressing component 24 is arranged in the middle of the base 21. The pressing component 24 is used to press and fit the first ends of the plurality of first connection tabs 14 and the corresponding plurality of busbars 12 together.

[0070] Specifically, the working mode of the welding tooling is as follows:

[0071] Install the bottom housing 11 together with multiple bus bars 12 on the base 21. Correspondingly place multiple first connection inserts 14 on the multiple bus bars 12, and use the pressing assembly 24 to press and fit the first ends of the multiple first connection inserts 14 with the corresponding multiple bus bars 12;

[0072] Abut the correction plate 22 against the bottom housing 11, and make the multiple correction holes 2201 on the correction plate 22 correspond to the second ends of the multiple first connection inserts 14 one by one. Use two pushing assemblies 23 to push and fit the correction plate 22 and the bottom housing 11;

[0073] Detach the pressing assembly 24 from the multiple first connection inserts 14, and weld (laser weld) the first ends of the multiple first connection inserts 14 corresponding to one bus bar 12. Then use the pressing assembly 24 to press and fit the first ends of the multiple first connection inserts 14 with the corresponding multiple bus bars 12;

[0074] Unlock the two pushing assemblies 23 and remove the correction plate 22. Place the BDU main board 13 on the bottom housing 11, and insert the second end of each first connection insert 14 into a welding hole of the BDU main board 13 and weld (wave soldering).

[0075] The welding tooling in the embodiment of the present invention is provided with a correction plate, two pushing assemblies and a pressing assembly. When welding the first connection insert with the bus bar and the BDU main board, the pressing assembly is used to press and fit the first end of the first connection insert with the corresponding bus bar, and the second end of the first connection insert is corrected by using the two pushing assemblies, the correction plate and the correction holes on the correction plate, so as to avoid deformation of the first connection insert after the first welding and make it difficult to weld with the BDU main board again, ensuring the final welding quality.

[0076] As an optional implementation manner, in an invention implementation, the pressing assembly 24 includes: a support column 2401, a rotating rod 2402, a fixed rod 2403, multiple pressing columns 2404 and a locking member 2405.

[0077] The support column 2401 is arranged on the base 21. The first end of the rotating rod 2402 is rotatably connected to the top end of the support column 2401. The fixed rod 2403 is fixed to the second end of the rotating rod 2402. The multiple pressing columns 2404 are arranged on the fixed rod 2403 at intervals. One end of each pressing column 2404 is used to press and fit the first end of one first connection insert 14 with the corresponding one bus bar 12. The locking member 2405 is arranged at the rotational connection of the rotating rod 2402 and the support column 2401, and is used to lock or unlock the first end of the rotating rod 2402 and the top end of the support column 2401. The pressing assembly 24 has a simple structure and is convenient to operate.

[0078] As an alternative embodiment, in one implementation of the invention, clamping blocks 2202 are provided on both sides of the correction plate 22. On the one hand, the clamping blocks 2202 on both sides facilitate the positioning and cooperation of the correction plate 22 with the bottom housing 11. On the other hand, they can prevent the correction plate 22 from slipping when the two pushing components 23 are unlocked.

[0079] The embodiment of the present invention also provides a method of using a welding tooling, including the following steps:

[0080] Install the bottom housing 11 together with a plurality of busbars 12 on the base 21, place a plurality of first connection inserts 14 on the plurality of busbars 12 in one-to-one correspondence, and use the pressing component 24 to press and fit the first ends of the plurality of first connection inserts 14 with the corresponding plurality of busbars 12;

[0081] Abut the correction plate 22 against the bottom housing 11, and make the plurality of correction holes 2201 on the correction plate 22 correspond to the second ends of the plurality of first connection inserts 14 one by one. Use two pushing components 23 to push and fit the correction plate 22 with the bottom housing 11;

[0082] Disconnect the pressing component 24 from the plurality of first connection inserts 14, weld the first ends of the plurality of first connection inserts 14 to a corresponding busbar 12, and then use the pressing component 24 to press and fit the first ends of the plurality of first connection inserts 14 with the corresponding plurality of busbars 12;

[0083] Unlock the two pushing components 23 and remove the correction plate 22. Place the BDU main board 13 on the bottom housing 11, and insert the second end of each first connection insert 14 into a welding hole of the BDU main board 13 and weld it.

[0084] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" 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 of the present invention. Unless otherwise clearly specified and defined, the terms "installation", "connection", and "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.

[0085] 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 term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0086] 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 the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features of the present invention disclosed herein.

Claims

1. A BDU, characterized in that, The BDU (1) includes: A bottom housing (11); A plurality of busbars (12) provided on the bottom housing (11); A BDU main board (13) provided on the bottom housing (11); A plurality of first connection inserts (14), with the first end of each first connection insert (14) welded to a corresponding one of the busbars (12) and the second end inserted into and welded to a welding hole of the BDU main board (13); A main circuit positive relay (15) and a main circuit negative relay (16) connected to the bottom housing (11), with at least one second connection insert (1501) provided on each of the main circuit positive relay (15) and the main circuit negative relay (16), and each second connection insert (1501) inserted into and welded to a welding hole of the BDU main board (13).

2. The BDU according to claim 1, wherein It further includes: Both ends of the shunt (17) of the BDU (1) are connected to two of the busbars (12), and a plurality of connection pins (1701) are provided in the middle of the shunt (17), and each connection pin (1701) is inserted into and welded to a welding hole of the BDU main board (13).

3. The BDU according to claim 1, wherein, It further includes: The precharge relay (18) and the heating relay (19) of the BDU (1) are provided with at least one third connection insert (1801), and each third connection insert (1801) is inserted into and welded to a welding hole of the BDU main board (13).

4. The BDU according to claim 3, wherein: A buffer pad (1802) is provided on the side of the precharge relay (18) and the heating relay (19) facing away from the BDU main board (13).

5. The BDU according to claim 1, wherein: The first connection insert (14) is Z-shaped, L-shaped or vertical, and an installation hole (1401) is provided in the middle of each first connection insert (14), and the installation hole (1401) cooperates with a positioning post (1101) of the bottom housing (11).

6. The BDU according to claim 1, wherein: All the busbars (12) and the bottom housing (11) are injection-molded to form an integral structure.

7. A welding tooling for the BDU described in claim 1, characterized in that, The welding tooling (2) includes: A base (21) for supporting the bottom housing (11); A correction plate (22) for abutting against the bottom housing (11), and correction holes (2201) corresponding to the second ends of each first connection insert (14) are provided on the correction plate (22); Two pushing components (23) provided on both sides of the base (21) for pushing the correction plate (22) and the bottom housing (11) to fit tightly; A pressing component (24) provided in the middle of the base (21) for pressing and fitting the first ends of the plurality of first connection inserts (14) and the corresponding plurality of busbars (12).

8. The welding tooling for the BDU according to claim 7, characterized in that, The pressing component (24) includes: Support column (2401), the support column (2401) is arranged on the base (21); Rotating rod (2402), the first end of the rotating rod (2402) is rotatably connected to the top end of the support column (2401); Fixed rod (2403), the fixed rod (2403) is fixed to the second end of the rotating rod (2402); A plurality of pressing columns (2404), the plurality of pressing columns (2404) are arranged on the fixed rod (2403) at intervals, and one end of each pressing column (2404) is used to press and fit the first end of one of the first connection inserts (14) with a corresponding one of the busbars (12); Locking member (2405), the locking member (2405) is arranged at the rotating connection between the rotating rod (2402) and the support column (2401).

9. The welding tooling for the BDU according to claim 7, characterized in that: Clamping blocks (2202) are arranged on both sides of the correction plate (22).

10. A method of using the welding tooling according to claim 7, characterized in that, Comprising the following steps: Install the bottom shell (11) together with a plurality of busbars (12) on the base (21), place a plurality of first connection inserts (14) on the plurality of busbars (12) in one-to-one correspondence, and use the pressing assembly (24) to press and fit the first ends of the plurality of first connection inserts (14) with the corresponding plurality of busbars (12); Abut the correction plate (22) against the bottom shell (11), and make the plurality of correction holes (2201) on the correction plate (22) correspond to the second ends of the plurality of first connection inserts (14) one by one, and use two pushing assemblies (23) to push and fit the correction plate (22) and the bottom shell (11); Disconnect the pressing assembly (24) from the plurality of first connection inserts (14), weld the first ends of the plurality of first connection inserts (14) corresponding to one busbar (12), and then use the pressing assembly (24) to press and fit the first ends of the plurality of first connection inserts (14) with the corresponding plurality of busbars (12); Unlock the two pushing assemblies (23) and remove the correction plate (22), place the BDU main board (13) on the bottom shell (11), and insert the second end of each first connection insert (14) into a welding hole of the BDU main board (13) and weld.

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