A BDU, a welding fixture, and a method of using a welding fixture

Abstract

The application discloses a kind of BDU, welding tool and the use method of welding tool, BDU manufacturing technical field, including: bottom shell, multiple busbar, BDU mainboard, multiple first connection tab, main circuit positive relay and main circuit negative relay, multiple busbar is arranged on the bottom shell, BDU mainboard is set on the bottom shell, the first end of each first connection tab corresponds with one busbar welding, second end corresponds with one welding hole of BDU mainboard and is welded, main circuit positive relay and main circuit negative relay are connected with bottom shell, at least one second connection tab is arranged on main circuit positive relay and main circuit negative relay, each second connection tab is inserted into one welding hole of the BDU mainboard and is welded.The high voltage sampling circuit of the BDU of the application is directly welded with multiple first connection tabs with BDU mainboard, and the relay low-voltage control circuit is directly welded with multiple second connection tabs with BDU mainboard, without wiring harness, without occupying space, and has strong anti-interference ability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of BDU manufacturing, in particular to a BDU, a welding tool and a method for using the welding tool. BACKGROUND

[0002] The BDU (Battery Disconnect Unit) is a kind of high-voltage distribution box specially designed for the inside of a battery pack. The BDU generally includes the following components:

[0003] 1. Main relay, which opens / cuts off the DC current of the main circuit of the battery pack;

[0004] 2. Pre-charge relay, which protects the high-voltage circuit from the instantaneous large current impact when the system is powered on;

[0005] 3. Current sensor (shunt), which is used to measure and calculate the capacity of the battery pack.

[0006] The BDU configures the main relay at the total positive and total negative of the battery pack to provide high-voltage DC supply to the system high-voltage components. In addition, the main relay can input current to the battery pack when 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 controller 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 mainboard through a wire harness, which has the technical problems of complex assembly, space occupation, and weak anti-interference capability. SUMMARY

[0008] Embodiments of the present application provide a BDU, a welding tool and a method for using the welding tool, to solve the technical problems of complex assembly, space occupation and weak anti-interference capability in the prior art, in which the relay low-voltage control circuit and the high-voltage sampling circuit of the BDU are connected to the BDU mainboard through a wire harness.

[0009] In a first aspect, a BDU is provided, which includes:

[0010] a bottom shell;

[0011] a plurality of bus bars arranged on the bottom shell;

[0012] a BDU mainboard arranged on the bottom shell;

[0013] a plurality of first connection tabs, each first connection tab having a first end corresponding to a bus bar and a second end corresponding to a welding hole of the BDU mainboard and being welded to the welding hole;

[0014] A main circuit positive relay and a main circuit negative relay connected to the bottom shell, at least one second connecting tab being provided on each of the main circuit positive relay and the main circuit negative relay, each of the second connecting tabs being inserted into and welded to a welding hole of the BDU main board.

[0015] In some embodiments, two ends of a shunt of the BDU are connected to two bus bars, and a plurality of connecting pins are provided on a middle portion of the shunt, each of the connecting pins being inserted into and welded to a welding hole of the BDU main board.

[0016] In some embodiments, at least one third connecting tab is provided on each of a pre-charging relay and a heating relay of the BDU, each of the third connecting tabs being inserted into and welded to a welding hole of the BDU main board.

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

[0018] In some embodiments, each of the first connecting tabs is Z-shaped, L-shaped or vertical, a mounting hole being provided on a middle portion of each of the first connecting tabs, the mounting hole being matched with a positioning column of the bottom shell.

[0019] In some embodiments, all of the bus bars are integrally formed with the bottom shell by injection molding.

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

[0021] a base for supporting the bottom shell;

[0022] a correction plate for abutting against the bottom shell, the correction plate being provided with a correction hole corresponding to a second end of each of the first connecting tabs;

[0023] two push components provided on two sides of the base, the two push components being used to push the correction plate to abut against the bottom shell;

[0024] a pressing component provided on a middle portion of the base, the pressing component being used to press a first end of each of the first connecting tabs to abut against a corresponding one of the bus bars.

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

[0026] a support column provided on the base;

[0027] a rotating rod, a first end of the rotating rod being rotatably connected to a top end of the support column;

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

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

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

[0031] In some embodiments, the two sides of the correction plate are provided with clamping blocks.

[0032] In a third aspect, a method for using the welding tool is provided, comprising the following steps:

[0033] The bottom shell is mounted on the base together with the plurality of bus bars, the plurality of first connecting tabs are placed on the plurality of bus bars one by one, and the first ends of the plurality of first connecting tabs are pressed and fitted with the corresponding plurality of bus bars by using the pressing assembly;

[0034] The correction plate is abutted with the bottom shell, the plurality of correction holes on the correction plate are one by one corresponding to the second ends of the plurality of first connecting tabs, and the correction plate and the bottom shell are pushed and fitted by using the two pushing assemblies;

[0035] The pressing assembly is separated from the plurality of first connecting tabs, the first ends of the plurality of first connecting tabs are welded with one of the bus bars, and the first ends of the plurality of first connecting tabs are pressed and fitted with the corresponding plurality of bus bars by using the pressing assembly;

[0036] The two pushing assemblies are unlocked and the correction plate is removed, the BDU main board is arranged on the bottom shell, and the second end of each first connecting tab is inserted into one of the welding holes of the BDU main board and welded.

[0037] The technical scheme provided by the present application has the beneficial effects of:

[0038] The BDU, the welding tool and the method for using the welding tool provided by the embodiments of the present application have the following beneficial effects: the bus bar of the BDU is directly welded with the BDU main board through the first connecting tab, that is, the high-voltage sampling loop is directly welded with the BDU main board through a plurality of first connecting tabs, the positive relay of the main loop and the negative relay of the main loop are directly welded with the BDU main board through the second connecting tab, that is, the relay low-voltage control loop is directly welded with the BDU main board through a plurality of second connecting tabs, no wire harness is needed, assembly is simple, no space is occupied, and the anti-interference capability is strong. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0040] Figure 1 A structure schematic diagram of a BDU provided by the embodiment of the present application is shown in the figure.

[0041] Figure 2 A structure schematic diagram of a BDU (without a bottom shell) provided by the embodiment of the present application is shown in the figure.

[0042] Figure 3 A structure schematic diagram of a main circuit positive relay and a BDU main board connection provided by the embodiment of the present application is shown in the figure.

[0043] Figure 4 A circuit schematic diagram of a BDU provided by the embodiment of the present application is shown in the figure.

[0044] Figure 5 A structure schematic diagram of a shunt and a BDU main board connection provided by the embodiment of the present application is shown in the figure.

[0045] Figure 6 Another structure schematic diagram of a BDU (without a bottom shell) provided by the embodiment of the present application is shown in the figure.

[0046] Figure 7 A structure schematic diagram of a first connection tab and a bottom shell cooperation provided by the embodiment of the present application is shown in the figure.

[0047] Figure 8 A structure schematic diagram of a first connection tab provided by the embodiment of the present application is shown in the figure.

[0048] Figure 9 A structure schematic diagram of a welding tool provided by the embodiment of the present application is shown in the figure.

[0049] Figure 10 A partial enlarged view of the structure schematic diagram of the welding tool provided by the embodiment of the present application is shown in the figure. Figure 9

[0050] Figure 11 Another structure schematic diagram of a welding tool provided by the embodiment of the present application is shown in the figure.

[0051] Reference signs:

[0052] ​1, BDU; 11, bottom shell; 1101, positioning column; 12, busbar; 13, BDU mainboard; 14, first connecting tab; 1401, mounting hole; 15, main circuit positive relay; 1501, second connecting tab; 16, main circuit negative relay; 17, shunt; 1701, connecting pin; 18, pre-charging relay; 1801, third connecting tab; 1802, buffer pad; 19, heating relay;

[0053] 2, welding tool; 21, base; 22, straightening plate; 2201, straightening hole; 2202, clamping block; 23, pushing assembly; 24, pressing assembly; 2401, supporting column; 2402, rotating rod; 2403, fixing rod; 2404, pressing column; 2405, locking piece. DETAILED DESCRIPTION

[0054] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0055] The embodiments of the present application provide a BDU, which can solve the technical problems that the low-voltage control circuit and the high-voltage sampling circuit of the relay of the existing BDU are connected with the BDU mainboard by using a wire harness, and that assembly is complex, space is occupied, and anti-interference capability is weak.

[0056] Referring to Figure 1 and Figure 2 The embodiments of the present application provide a BDU, which comprises a bottom shell 11, a plurality of busbars 12, a BDU mainboard 13, a plurality of first connecting 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 shell 11, and the BDU mainboard 13 is arranged on the bottom shell 11. The first end of each first connecting tab 14 is welded to a corresponding busbar 12, and the second end of each first connecting tab 14 is inserted into and welded to a corresponding welding hole of the BDU mainboard 13.

[0058] The main circuit positive relay 15 and the main circuit negative relay 16 are connected with the bottom shell 11. At least one second connecting tab 1501 (as shown in the figure) is arranged on each of the main circuit positive relay 15 and the main circuit negative relay 16. Each second connecting tab 1501 is inserted into and welded to a corresponding welding hole of the BDU mainboard 13. Figure 3 The embodiments of the present application provide a BDU, which can solve the technical problems that the low-voltage control circuit and the high-voltage sampling circuit of the relay of the existing BDU are connected with the BDU mainboard by using a wire harness, and that assembly is complex, space is occupied, and anti-interference capability is weak.

[0059] Referring to Figure 2 and Figure 4 As shown in the figure, #1 first connecting tab is laser welded with #1 busbar, #1 first connecting tab is pack+ sampling; #2 first connecting tab is laser welded with #2 busbar, #2 first connecting tab is fuse+ sampling; #3 first connecting tab is laser welded with #3 busbar, #3 first connecting tab is link+ sampling; #4 first connecting tab is laser welded with #4 busbar, #4 first connecting tab is link- sampling; #5 first connecting tab is laser welded with #6 busbar, #5 first connecting tab is pack- sampling; #1 busbar is connected with main fuse between #2 busbar, #2 busbar is connected with main positive relay 15 between #3 busbar, #4 busbar assembly is connected with main negative relay 16 between #6 busbar, #6 busbar is connected with shunt 17 between #5 busbar, forming main positive loop and main negative loop of BDU.

[0060] In the embodiment of the application, the busbar is directly welded with the BDU mainboard through the first connecting tab, that is, the high-voltage sampling loop is directly welded with the BDU mainboard through a plurality of first connecting tabs, and the main loop positive relay and the main loop negative relay are directly welded with the BDU mainboard through a plurality of second connecting tabs, that is, the relay low-voltage control loop is directly welded with the BDU mainboard through a plurality of second connecting tabs, without wire harness, simple assembly, no space occupation, and strong anti-interference capability.

[0061] As an optional embodiment, in one embodiment of the application, referring to Figure 2 and Figure 5 As shown in the figure, two ends of the shunt 17 of the BDU are connected with two busbars 12, and the middle part of the shunt 17 is provided with a plurality of connecting pins 1701, the plurality of connecting pins 1701 are correspondingly inserted into a plurality of welding holes of the BDU mainboard 13 and welded, and the shunt 17 is directly inserted into the BDU mainboard 13 for welding, without using male and female terminals or wire harness connection.

[0062] As an optional embodiment, in one embodiment of the application, referring to Figure 2 and Figure 6 As shown in the figure, the pre-charging relay 18 and the heating relay 19 of the BDU are provided with at least one third connecting tab 1801, and each third connecting tab 1801 is correspondingly inserted into a welding hole of the BDU mainboard 13 and welded.

[0063] Further, referring to Figure 6As shown, the pre-charge relay 18 and the heating relay 19 are provided with a buffer pad 1802 on the side away from the BDU main board 13, which absorbs and alleviates the stress of the BDU main board 13 when the direction is vibrated or impacted. The pre-charge relay 18 and the heating relay 19 are provided with structural glue of at least 5 mm around, which reduces the stress of the BDU main board 13.

[0064] As an optional embodiment, in one of the embodiments of the application, referring to Figure 7 and Figure 8 As shown, the first connecting tab 14 is Z-shaped, L-shaped or vertical, and the middle part of each first connecting tab 14 is provided with a mounting hole 1401, which cooperates with a positioning column 1101 of the bottom shell 11, so as to facilitate the positioning and installation of the first connecting tab 14.

[0065] As an optional embodiment, in one of the embodiments of the application, all bus bars 12 are integrally formed with the bottom shell 11 by injection molding. The bottom parts of all bus bars 12 are in the same plane, and the bus bars can be additionally provided with an insulating film and a heat-conducting pad.

[0066] Considering that a large soldering hole is not allowed on the BDU main board 13 (a large soldering hole will cause a soldering defect, and the BDU main board 13 may be disconnected when vibrated or impacted), referring to Figure 9 As shown, the application also provides a soldering tool for soldering the aforementioned BDU, and the soldering tool 2 comprises a base 21, a correction plate 22, two pushing assemblies 23 and a pressing assembly 24.

[0067] The base 21 is used for supporting the bottom shell 11, and the base 21 is used for abutting against the bottom shell 11. The correction plate 22 is provided with a correction hole 2201 corresponding to each second end of the first connecting tab 14. The correction hole 2201 is trumpet-shaped towards the second end of the first connecting tab 14, so as to facilitate the insertion of the second end of the first connecting tab 14 into the corresponding correction hole 2201.

[0068] The two pushing assemblies 23 are arranged on the two sides of the base 21, and the two pushing assemblies 23 are used for pushing the correction plate 22 and the bottom shell 11 to be attached.

[0069] The pressing assembly 24 is arranged in the middle part of the base 21, and the pressing assembly 24 is used for pressing and attaching the first ends of the first connecting tabs 14 and the corresponding bus bars 12.

[0070] Specifically, the working mode of the soldering tool is as follows:

[0071] The bottom shell 11 is installed on the base 21 together with a plurality of bus bars 12, a plurality of first connecting tabs 14 are placed on the plurality of bus bars 12 one by one, and the first ends of the plurality of first connecting tabs 14 are pressed and fitted with the corresponding plurality of bus bars 12 by using the pressing assembly 24;

[0072] The correction plate 22 is abutted with the bottom shell 11, and the plurality of correction holes 2201 on the correction plate 22 are one by one corresponding to the second ends of the plurality of first connecting tabs 14, and the correction plate 22 is pressed and fitted with the bottom shell 11 by using the two pushing assemblies 23;

[0073] The pressing assembly 24 is separated from the plurality of first connecting tabs 14, and the first ends of the plurality of first connecting tabs 14 are welded (laser welding) with a bus bar 12 one by one, and then the first ends of the plurality of first connecting tabs 14 are pressed and fitted with the corresponding plurality of bus bars 12 by using the pressing assembly 24;

[0074] The two pushing assemblies 23 are unlocked and the correction plate 22 is removed, the BDU main board 13 is arranged on the bottom shell 11, and the second end of each first connecting tab 14 is inserted into a welding hole of the BDU main board 13 and welded (wave soldering).

[0075] The welding tool in the embodiment of the application is provided with a correction plate, two pushing assemblies and a pressing assembly, when the first connecting tab is welded with the bus bar and the BDU main board, the first end of the first connecting tab is pressed and fitted with the corresponding bus bar by using the pressing assembly, and the second end of the first connecting tab is corrected by using the two pushing assemblies, the correction plate and the correction hole on the correction plate, so that the deformation of the first connecting tab after the first welding is avoided, the first connecting tab is difficult to be welded with the BDU main board again, and the welding quality is ensured.

[0076] As an optional embodiment, in one embodiment of the application, the pressing assembly 24 comprises a supporting column 2401, a rotating rod 2402, a fixed rod 2403, a plurality of pressing columns 2404 and a locking piece 2405.

[0077] The supporting column 2401 is arranged on the base 21, the first end of the rotating rod 2402 is rotationally connected with the top end of the supporting column 2401, the fixed rod 2403 is fixed to the second end of the rotating rod 2402, the plurality of 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 connecting tab 14 with the corresponding bus bar 12, and the locking piece 2405 is arranged at the rotation connection between the rotating rod 2402 and the supporting column 2401, and is used to lock or unlock the first end of the rotating rod 2402 and the top end of the supporting column 2401, so that the pressing assembly 24 has simple structure and is convenient to operate.

[0078] As an optional implementation, in one of the embodiments of the application, the two sides of the correction plate 22 are provided with clamping blocks 2202, which on the one hand facilitate the positioning and cooperation of the correction plate 22 and the bottom shell 11, and on the other hand can prevent the correction plate 22 from falling off when the two push assemblies 23 are unlocked.

[0079] The embodiment of the application also provides a method for using the welding tool, comprising the following steps:

[0080] The bottom shell 11 is installed on the base 21 together with the plurality of bus bars 12, the plurality of first connecting tabs 14 are placed on the plurality of bus bars 12 one by one, and the first ends of the plurality of first connecting tabs 14 are pressed and adhered to the corresponding plurality of bus bars 12 by using the pressing assembly 24;

[0081] The correction plate 22 is abutted with the bottom shell 11, and the plurality of correction holes 2201 on the correction plate 22 correspond to the second ends of the plurality of first connecting tabs 14 one by one, and the correction plate 22 and the bottom shell 11 are pushed and adhered by using the two push assemblies 23;

[0082] The pressing assembly 24 is separated from the plurality of first connecting tabs 14, the first ends of the plurality of first connecting tabs 14 are welded to a bus bar 12, and the first ends of the plurality of first connecting tabs 14 are pressed and adhered to the corresponding plurality of bus bars 12 by using the pressing assembly 24;

[0083] The two push assemblies 23 are unlocked and the correction plate 22 is removed, the BDU main board 13 is arranged on the bottom shell 11, and the second end of each first connecting tab 14 is inserted into a welding hole of the BDU main board 13 and welded.

[0084] In the description of the application, it should be noted that the terms “upper”, “lower”, and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. Unless otherwise specified and limited, the terms “mounting”, “connecting”, “connecting” should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0085] It should be noted that, in the present application, the relational terms such as "first" and "second", and the like, are used solely to distinguish one from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0086] The foregoing is considered as illustrative only of the principles of the application. Numerous modifications and changes will readily occur to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Accordingly, the scope of the application is intended to be defined only as set forth in the claims.

Claims

1. A welding tool for welding of a BDU (1), the BDU (1) comprising: a bottom shell (11) ; a plurality of bus bars (12) arranged on the bottom shell (11), all the bus bars (12) being integrally formed with the bottom shell (11) by injection molding; a BDU main board (13) arranged on the bottom shell (11) ; a plurality of first connecting tabs (14), each first connecting tab (14) having a first end welded to a corresponding bus bar (12) and a 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 shell (11), each of the main circuit positive relay (15) and the main circuit negative relay (16) being provided with at least one second connecting tab (1501), each second connecting tab (1501) being inserted into and welded to a welding hole of the BDU main board (13) ; a shunt (17) of the BDU (1), two ends of the shunt (17) being connected to two bus bars (12), and a middle part of the shunt (17) being provided with a plurality of connecting pins (1701), each connecting pin (1701) being inserted into and welded to a welding hole of the BDU main board (13) ; characterized in that the welding tool (2) comprises: a base (21) for supporting the bottom shell (11) ; a correction plate (22) arranged against the bottom shell (11), the correction plate (22) being provided with a correction hole (2201) corresponding to the second end of each first connecting tab (14) ; two push components (23) arranged on both sides of the base (21), the two push components (23) being used to push the correction plate (22) against the bottom shell (11) ; a pressing component (24) arranged in the middle of the base (21), the pressing component (24) being used to press the first ends of the plurality of first connecting tabs (14) against the corresponding plurality of bus bars (12).

2. The welding fixture of claim 1, wherein, Further comprising: the pre-charging relay (18) and the heating relay (19) of the BDU (1) are provided with at least one third connecting tab (1801), each third connecting tab (1801) being inserted into and welded to a welding hole of the BDU main board (13). 3.The welding tool according to claim 2, characterized in that: the pre-charging relay (18) and the heating relay (19) are provided with a buffer pad (1802) on a side facing away from the BDU main board (13). 4.The welding tool according to claim 1, characterized in that: the first connecting tab (14) is Z-shaped, L-shaped or vertical, and each first connecting tab (14) is provided with a mounting hole (1401) in the middle part, the mounting hole (1401) being matched with a positioning column (1101) of the bottom shell (11).

5. The welding fixture of claim 1, wherein, the pressing component (24) comprises: A support column (2401) is arranged on the base (21); A rotating rod (2402) is rotatably connected to the top end of the support column (2401); A fixed rod (2403) is fixed to the second end of the rotating rod (2402); A 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 first connecting tab (14) with the corresponding busbar (12); A locking member (2405) is arranged at the rotating connection between the rotating rod (2402) and the support column (2401).

6. The welding tool of claim 1, wherein: The two sides of the correction plate (22) are provided with clamping blocks (2202).

7. A method of using the welding fixture of claim 1, wherein, The steps include: The bottom shell (11) is installed on the base (21) together with a plurality of busbars (12), a plurality of first connecting tabs (14) are placed one by one on the plurality of busbars (12), and the first ends of the plurality of first connecting tabs (14) are pressed and fitted with the corresponding plurality of busbars (12) using the pressing assembly (24); The correction plate (22) is abutted with the bottom shell (11), and the plurality of correction holes (2201) on the correction plate (22) are one-to-one corresponding with the second ends of the plurality of first connecting tabs (14), and the correction plate (22) and the bottom shell (11) are pushed and fitted using two pushing assemblies (23); The pressing assembly (24) is separated from the plurality of first connecting tabs (14), and the first ends of the plurality of first connecting tabs (14) are welded with one busbar (12), and then the first ends of the plurality of first connecting tabs (14) are pressed and fitted with the corresponding plurality of busbars (12) using the pressing assembly (24); The two pushing assemblies (23) are unlocked and the correction plate (22) is removed, the BDU main board (13) is arranged on the bottom shell (11), and the second end of each first connecting tab (14) is inserted into one welding hole of the BDU main board (13) and welded.

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