Long and narrow BDU structure

Abstract

The utility model provides a long and narrow BDU structure, and belongs to the technical field of BDUs. Comprising a shell extending in a first preset direction and a second preset direction; a wire slot is also formed in the shell; the fuse and the current sensor are fixedly arranged at the two ends, extending in the first preset direction, in the shell respectively. The relays are arranged at non-end positions, extending in the first preset direction, in the shell at intervals and fixedly connected with the inner surface of the shell, and at least one relay is arranged in the opening direction of the wire groove in a crossing mode; a contact of the relay is electrically connected with a terminal of the battery pack, a terminal of the quick charge loop, a terminal of the load loop or a contact of an adjacent relay through a plurality of busbars; wherein a plurality of wire harnesses are arranged in the wire duct in a penetrating manner, and the plurality of wire harnesses are electrically connected with the low-voltage control ends of the plurality of relays or the busbar respectively. According to the utility model, by reasonably arranging the wire ducts and the devices, the occupied space in the second preset direction is small, a single-row linear layout is formed, and the device is suitable for being used in an environment with effective space.

Description

Technical Field

[0001] The utility model relates to the technical field of BDU, in particular to a long and narrow BDU structure. Background Art

[0002] The Battery Disconnect Unit (BDU), also known as the Battery Cut-off Unit, is an important device for connecting battery packs, fast charging circuits, and load circuits. It controls the flow of electrical energy from the battery pack to the load or from the external charging circuit to the battery pack, and can cut off the electrical energy circuit in case of emergency to prevent further accidents. It has been widely used in the field of new energy applications.

[0003] With the continuous improvement of the energy density of battery packs, within the limited envelope space, it is necessary to increase the number of battery cells as much as possible, resulting in very little space margin in the extension direction of the electrical layout area, and making the space for arranging devices such as BDU, BMS, and low-voltage wiring harnesses in the remaining space relatively crowded. In a common BDU structure, in order to facilitate wire routing, different relays are arranged staggered in the extension direction of the wiring harness, occupying a large amount of space in the electrical layout area, and it is easy to have situations of friction interference or difficult assembly with other devices, bringing great challenges to installation and maintenance.

[0004] In view of this, it is very necessary to provide a long and narrow BDU structure with linearly arranged internal devices and smaller occupied space in the electrical layout area for more convenient installation and maintenance of electrical components in the battery pack. Summary of the Utility Model

[0005] In view of this, the utility model proposes a long and narrow BDU structure with a small volume, reasonable layout of internal device positions, and convenient for installation and maintenance.

[0006] The utility model provides a long and narrow BDU structure, including:

[0007] A housing extending along a first preset direction and a second preset direction respectively; the interior of the housing is hollow, and a wire groove is also provided inside the housing;

[0008] A fuse fixedly arranged at one end of the housing extending along the first preset direction;

[0009] A current sensor fixedly arranged at the other end of the housing extending along the first preset direction;

[0010] A plurality of relays are arranged at intervals at non-end positions extending along a first preset direction inside the housing and fixedly connected to the inner surface of the housing, and at least one relay is arranged across the opening direction of the wire slot; the contacts of the relay are electrically connected to the terminals of the battery pack, the terminals of the fast charging circuit, the terminals of the load circuit, or the contacts of adjacent relays through a plurality of bus bars;

[0011] Among them, a plurality of wire harnesses are inserted into the wire trough, and the plurality of wire harnesses are electrically connected to the low-voltage control terminals, bus bars or current sensors of a plurality of relays respectively.

[0012] On the basis of the above technical scheme, preferably, the shell includes a hollow body and a cover body, an opening is provided on one side of the body, and a wire groove is provided on the inner surface of the body facing the opening, and the wire groove extends along the first preset direction and away from the opening respectively; the cover body is covered at the opening to close the body; two first mounting bosses are provided at one end of the body extending along the first preset direction, and the two first mounting bosses are arranged at intervals; the end surfaces of the two first mounting bosses away from the wire groove do not exceed the opening of the body; a plurality of windows are provided on the body, the first window and the second window are respectively arranged at the two ends of the body extending along the first preset direction, and the third window, the fourth window and the fifth window are sequentially provided at one end of the body extending along the second preset direction, and the plurality of windows are interconnected with the inside and the outside of the body.

[0013] Preferably, the two axially extending ends of the fuse are respectively straddling the end faces of the two first mounting bosses away from the wire slot and are relatively fixed to the two first mounting bosses; one end of the fuse also extends into the first window for electrical connection with the positive terminal of the battery pack, and the other end of the fuse is electrically connected to the low-voltage control end of a relay; a gap is set between the fuse and one end of the two first mounting bosses close to the wire slot.

[0014] Further preferably, the plurality of relays include a pre-charge relay, a main positive relay, a fast charge relay and a main negative relay which are arranged in sequence and at intervals; the pre-charge relay is fixedly arranged on one side of a first mounting boss close to the fuse away from the first window, and the pre-charge relay does not exceed the end surface of the two first mounting bosses away from the wire slot; the main positive relay, the fast charge relay and the main negative relay are arranged in sequence across the inner surface of the main body on both sides of the opening direction of the wire slot, and are fixedly connected to the main body; the end of the fuse away from the first window is electrically connected to the first contact of the main positive relay through a first bus, the second contact of the main positive relay is electrically connected to the first contact of the fast charge relay through a second bus, and the second bus is also It extends into the third window and is electrically connected to the positive terminal of the load circuit; the second contact of the fast charging relay is electrically connected to one end of the third bus, and the other end of the third bus extends into the fourth window and is electrically connected to the positive terminal of the fast charging circuit; the first contact of the main negative relay is electrically connected to one end of the fourth bus, and the other end of the fourth bus extends into the fifth window, and is respectively electrically connected to the negative terminal of the load circuit and the negative terminal of the fast charging circuit; the second contact of the main negative relay is electrically connected to one end of the fifth bus, and the other end of the fifth bus passes through the current sensor and extends into the second window, for being electrically connected to the negative terminal of the battery pack, and the current sensor is arranged around the fifth bus.

[0015] Still further preferably, a high-voltage collection connector and a low-voltage control connector are provided on one side of the body near the second window, and both the high-voltage collection connector and the low-voltage control connector are inserted into the body, and a first wiring harness electrically connected to the low-voltage control end of each relay or the current sensor is also electrically connected to the low-voltage control connector respectively; a second wiring harness electrically connected to a plurality of bus bars is also electrically connected to the high-voltage collection connector.

[0016] Still further preferably, a pre-charging resistor is provided in the gap between the fuse and the end face of the body where the wire slot is opened; the first contact of the pre-charging relay is electrically connected to the first bus, the second contact of the pre-charging relay is electrically connected to one end of the pre-charging resistor, and the other end of the pre-charging resistor is electrically connected to the second bus.

[0017] Still further preferably, the two first mounting bosses deviate from the bottom surface of the main body at different distances.

[0018] Still further preferably, it also includes a second mounting boss, which is arranged on one side of the wire groove and extends along the first preset direction; the second mounting boss is flush with the end of the third window, the fourth window and the fifth window away from the opening, and a plurality of fixing holes are arranged on the second mounting boss, and corresponding connecting holes are arranged on the second bus, the third bus and the fourth bus, and the fixing holes and the connecting holes are arranged in a one-to-one correspondence.

[0019] Further preferably, it further includes a third mounting boss, the third mounting boss is arranged on the inner surface of the body on the opposite side of the second mounting boss, and the end surface of the third mounting boss close to the second window is flush with the end surface of the second mounting boss close to the second window; the end surfaces of the second mounting boss and the third mounting boss close to the second window respectively abut against different positions of the end surface of the current sensor.

[0020] Based on the above technical solutions, preferably, the size of the wire groove is larger than the diameters of several wire harnesses.

[0021] A long and narrow BDU structure provided by the present invention has the following beneficial effects compared with the prior art:

[0022] (1) The main electrical components in the housing adopt a linear layout and are arranged in a row. The BDU has a simple appearance and is only limited by the width of the relay and the thickness of the first mounting boss, which can effectively save the overall volume of the BDU;

[0023] (2) The pre-charge resistor and the fuse are arranged in an up-and-down structure, making full use of the gap space between the first mounting boss and the body, and reasonably arranging the position of the pre-charge resistor;

[0024] (3) A wire groove is provided at the bottom of the housing, and the main body of the wire harness is arranged along the wire groove and passes through the bottom of the relay to achieve hidden wiring. Through the up-and-down dislocation layout, the wire harness does not occupy additional internal space of the housing;

[0025] (4) The output interfaces of the BDU are reasonably arranged and concentrated at the positions where the windows are located, which can avoid the phenomenon of difficult wiring of external wiring and reduce the difficulty of BDU assembly and maintenance. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings 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.

[0027] Figure 1 It is a three-dimensional view of a long and narrow BDU structure of the present invention;

[0028] Figure 2 It is a three-dimensional view of another posture of a long and narrow BDU structure of the present invention;

[0029] Figure 3 It is a three-dimensional view of a long and narrow BDU structure of the present invention after removing the cover;

[0030] Figure 4 Stereogram of the body of a long and narrow BDU structure of the present utility model;

[0031] Figure 5 Top view of the body of a long and narrow BDU structure of the present utility model;

[0032] Figure 6 Electrical schematic diagram of a long and narrow BDU structure of the present utility model.

[0033] Reference numerals: 1, housing; 100, wire groove; 2, fuse; 3, current sensor; 4, relay; 5, bus bar; 6, wire harness; 11, body; 12, cover body; 200, open end; 13, first mounting boss; 300, first window; 400, second window; 500, third window; 600, fourth window; 700, fifth window; 41, pre-charge relay; 42, main positive relay; 43, fast charge relay; 44, main negative relay; 51, first bus bar; 52, second bus bar; 53, third bus bar; 54, fourth bus bar; 55, fifth bus bar; 7, high-voltage acquisition connector; 8, low-voltage control connector; 9, pre-charge resistor; 14, second mounting boss; 15, third mounting boss. Detailed implementation manners

[0034] Next, in combination with the implementation manners of the present utility model, the technical solutions in the implementation manners of the present utility model will be clearly and completely described. Obviously, the described implementation manners are only a part of the implementation manners of the present utility model, rather than all of the implementation manners. Based on the implementation manners in the present utility model, all other implementation manners obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0035] As Figure 1 , Figure 2 Combined with Figure 6 As shown, the present utility model provides a long and narrow BDU structure, including:

[0036] The housing 1 extends along a first preset direction and a second preset direction respectively; the interior of the housing 1 is hollow, and a wire groove 100 is further opened inside; the wire groove 100 is used for hidden wiring to prevent interference with the layout positions of other devices. The first preset direction is the length extension direction of the housing 1, and the second preset direction is the width direction of the housing 1. The first preset direction and the second preset direction are orthogonally arranged.

[0037] The fuse 2 is fixedly arranged at one end of the housing 1 extending along the first preset direction; the fuse 2 is in a columnar structure and is arranged on the output side of the positive terminal of the battery pack, serving as a protection device for the BDU.

[0038] The current sensor 3 is fixedly arranged at the other end extending in the first preset direction in the housing 1. The current sensor 3 is used to obtain the current sensing signal on the negative terminal side of the battery pack and send the current sensing signal to an external controller such as a BMS. The current sensor shown in the figure is a ring-shaped non-contact structure.

[0039] A plurality of relays 4 are arranged at intervals at non-end positions extending along the first preset direction inside the housing 1 and are fixedly connected to the inner surface of the housing 1. At least one relay is arranged across the opening direction of the wire slot 100. The contacts of the relays 4 are electrically connected to the terminals of the battery pack, the terminals of the fast charging circuit, the terminals of the load circuit, or the contacts of adjacent relays 4 through a plurality of busbars 5. By powering on the low-voltage control end of each relay 4, the switching of the fast charging circuit and the load circuit or the circuit disconnection function is realized. Figure 1 and Figure 2 The B+ and B- in the diagram correspond to the positive and negative terminals of the battery pack. Figure 1 and Figure 6 The FC+ and FC- in the figure correspond to the positive and negative terminals of the fast charging circuit. Figure 1 and Figure 6 The MCU+ and MCU- in the circuit correspond to the positive and negative terminals of the load.

[0040] Among them, a plurality of wire harnesses 6 are inserted into the wire trough 100, and the plurality of wire harnesses 6 are electrically connected to the low-voltage control terminals of the plurality of relays 4, the bus bar 5 or the current sensor 3. In order to arrange the wire harnesses in a limited space, the wire trough 100 is used to hide the wiring, thereby avoiding the risk of interference with the device. The size of the wire trough 100 is larger than the diameter of the plurality of wire harnesses 6.

[0041] like Figure 1 , Figure 2 and Figure 3 As shown, the shell 1 includes a hollow body 11 and a cover body 12, an opening 200 is provided on one side of the body 11, and a wire groove 100 is provided on the inner surface of the body 11 facing the opening 200, and the wire groove 100 extends along the first preset direction and the direction away from the opening 200, that is, the wire groove 100 extends along the length direction and the thickness direction of the shell; the cover body 12 is covered at the opening 200 to close the body 11; two first mounting bosses 13 are provided at one end of the body 11 extending along the first preset direction, and the two first mounting bosses 13 are arranged at intervals; the end surfaces of the two first mounting bosses 13 away from the wire groove 100 do not exceed the opening 200 of the body 11; a plurality of windows are provided on the body 11, a first window 300 and a second window 400 are respectively arranged at two ends of the body 11 extending along the first preset direction, and a third window 500, a fourth window 600 and a fifth window 700 are sequentially provided at one end of the body 11 extending along the second preset direction, and the plurality of windows are interconnected with the inside of the body 11 and the outside of the body 11.

[0042] Each window serves as a connection port for connecting to the external battery pack terminals, the terminals of the fast charging circuit, and the terminals of the load circuit, and is centrally arranged at both ends and the side surface in the length extension direction of the housing, which can reduce the difficulty of routing external cables and facilitate the installation and maintenance of the BDU.

[0043] The fuse 2 is in a cylindrical shape. In order to fix it reliably, a structure of two first mounting bosses 13 is adopted to mount the fuse 2. The two axially extending ends of the fuse 2 straddle the end faces of the two first mounting bosses 13 away from the wire groove 100 respectively and are relatively fixed to the two first mounting bosses 13; one end of the fuse 2 also extends into the first window 300 for electrically connecting to the positive terminal of the battery pack, and the other end of the fuse 2 is electrically connected to the low-voltage control end of a relay 4; there is a clearance between the fuse 2 and one end of the two first mounting bosses 13 close to the wire groove 100. The heights of the two first mounting bosses 13 are both greater than the radius of the fuse 2, so that the fuse 2 is lifted to a certain height, and this lifted height forms a clearance space for placing Figure 6 the pre-charge resistor 9 in

[0044] The distances of the two first mounting bosses 13 from the bottom surface of the body 11 are different. This situation is to adapt to the stacked safety structure of the bus bar and the fuse 2, that is, the bus bar is placed at the end of the first mounting boss 13 with a lower height, and the end of the fuse 2 is stacked on the end face of the bus bar. Of course, if the bus bar is stacked above the end of the fuse 2, the heights of the two first mounting bosses 13 can be set to be the same.

[0045] A plurality of relays 4 include a pre-charge relay 41, a main positive relay 42, a fast charge relay 43 and a main negative relay 44 which are arranged in sequence at intervals; the pre-charge relay 41 is fixedly arranged on one side of a first mounting boss 13 close to the fuse 2 away from the first window 300, and the pre-charge relay 41 does not exceed the end surface of the two first mounting bosses 13 away from the wire slot 100; the main positive relay 42, the fast charge relay 43 and the main negative relay 44 are sequentially arranged across the inner surface of the body 11 on both sides of the opening direction of the wire slot 100, and are fixedly connected to the body 11; one end of the fuse 2 away from the first window 300 is electrically connected to the first contact of the main positive relay 42 through the first bus 51, the second contact of the main positive relay 42 is electrically connected to the first contact of the fast charge relay 43 through the second bus 52, and the second bus The current bus 52 also extends into the third window 500 and is electrically connected to the positive terminal of the load circuit; the second contact of the fast charging relay 43 is electrically connected to one end of the third bus 53, and the other end of the third bus 53 extends into the fourth window 600 and is electrically connected to the positive terminal of the fast charging circuit; the first contact of the main negative relay 44 is electrically connected to one end of the fourth bus 54, and the other end of the fourth bus 54 extends into the fifth window 700, and is respectively electrically connected to the negative terminal of the load circuit and the negative terminal of the fast charging circuit; the second contact of the main negative relay 44 is electrically connected to one end of the fifth bus 55, and the other end of the fifth bus 55 passes through the current sensor 3 and extends into the second window 400, for being electrically connected to the negative terminal of the battery pack, and the current sensor 3 is arranged around the fifth bus 55.

[0046] The wiring harness 6 can be subdivided into a low-voltage first wiring harness and a high-voltage second wiring harness. A high-voltage collection connector 7 and a low-voltage control connector 8 are provided on one side of the body 11 near the second window 400. Both the high-voltage collection connector 7 and the low-voltage control connector 8 are inserted into the body 11. The first wiring harness electrically connected to the low-voltage control end of each relay or the current sensor 3 is also electrically connected to the low-voltage control connector 8; the second wiring harness electrically connected to a plurality of busbars 5 is also electrically connected to the high-voltage collection connector 7, such as the second wiring harness connected to the second busbar 22 and the fifth busbar 55. Figure 6 As shown, the first wiring harness is electrically connected to one end of the coil of the low-voltage control end of each relay, and the other end of the coil can be grounded; the first wiring harness is electrically connected to the low-voltage control connector 8, thereby importing the control signal of the external controller, such as BMS, into the BDU. The second wiring harness is used to collect the high-voltage signal at the bus bar and transmit the high-voltage signal to the external controller through the high-voltage collection connector 7.

[0047] like Figure 3As shown, a pre-charge resistor 9 is disposed at a gap between the fuse 2 and an end face of the main body 11 where the wire groove 100 is formed; a first contact of the pre-charge relay 41 is electrically connected to the first bus bar 51, a second contact of the pre-charge relay 41 is electrically connected to one end of the pre-charge resistor 9, and the other end of the pre-charge resistor 9 is electrically connected to the second bus bar 52. The pre-charge resistor 9 can be limited and fixed by arranging a vertical baffle and an elastic buckle in the area directly below the fuse 2, making full use of the space between the fuse 2 and the two first mounting bosses 13.

[0048] As Figure 3 shown, in order to better place and fix the bus bar 5, the present utility model further includes a second mounting boss 14, which is disposed on one side of the wire groove 100 and extends along a first preset direction; the second mounting boss 14 is flush with the ends of the third window 500, the fourth window 600, and the fifth window 700 away from the open end 200, and a plurality of fixing holes are provided on the second mounting boss 14, and corresponding connection holes are provided on the second bus bar 52, the third bus bar 53, and the fourth bus bar 54. The fixing holes and the connection holes are arranged in one-to-one correspondence. The portions of the second bus bar 52, the third bus bar 53, and the fourth bus bar 54 connecting to the external terminals are away from the relay, and the ends of the above-mentioned bus bars need to be lifted and fixed, which is also convenient for connecting to the terminals of the external circuit.

[0049] In order to prevent the current sensor 3 from loosening or twisting after installation, the present utility model is further configured with a third mounting boss 15, which is disposed on the inner surface of the main body 11 on the opposite side of the second mounting boss 14, and the end face of the third mounting boss 15 close to the second window 400 is flush with the end face of the second mounting boss 14 close to the second window 400; the end faces of the second mounting boss 14 and the third mounting boss 15 close to the second window 400 respectively abut against different positions of the end face of the current sensor 3. By cooperating the third mounting boss 15 with the second mounting boss 14, the current sensor 3 is jointly limited, and there is no need to additionally provide a mounting bracket to fix the current sensor 3.

[0050] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A long and narrow BDU structure, characterized in that, include: The shell (1) extends along a first preset direction and a second preset direction respectively; the shell (1) is hollow inside, and a wire groove (100) is also provided inside the shell (1); A fuse (2) is fixedly arranged in the housing (1) at one end extending along a first preset direction; A current sensor (3) is fixedly arranged in the housing (1) at the other end extending along the first preset direction; A plurality of relays (4) are arranged at intervals at non-end positions extending along a first preset direction inside the housing (1) and fixedly connected to the inner surface of the housing (1), and at least one relay is arranged across the opening direction of the wire slot (100); the contacts of the relay (4) are electrically connected to the terminals of the battery pack, the terminals of the fast charging circuit, the terminals of the load circuit, or the contacts of adjacent relays (4) through a plurality of bus bars (5); A plurality of wire harnesses (6) are inserted into the wire trough (100), and the plurality of wire harnesses (6) are electrically connected to low-voltage control terminals of a plurality of relays (4), a bus bar (5) or a current sensor (3), respectively.

2. The long and narrow BDU structure according to claim 1, wherein The housing (1) comprises a hollow body (11) and a cover (12); an opening (200) is provided on one side of the body (11); a wire groove (100) is provided on the inner surface of the body (11) facing the opening (200); the wire groove (100) extends along a first preset direction and in a direction away from the opening (200); the cover (12) is arranged on the opening (200) to seal the body (11); two first mounting bosses (13) are provided at one end of the body (11) extending along the first preset direction; a space between the two first mounting bosses (13) is provided. The two first mounting bosses (13) are arranged at intervals; the end surfaces of the two first mounting bosses (13) away from the wire groove (100) do not exceed the opening (200) of the body (11); a plurality of windows are provided on the body (11), the first window (300) and the second window (400) are respectively provided at two ends of the body (11) extending along a first preset direction, and a third window (500), a fourth window (600) and a fifth window (700) are sequentially provided at one end of the body (11) extending along a second preset direction, and the plurality of windows are interconnected with the interior of the body (11) and the exterior of the body (11).

3. The elongated BDU structure according to claim 2, characterized in that, The two axially extending ends of the fuse (2) are respectively straddled on the end surfaces of the two first mounting bosses (13) away from the wire slot (100), and are relatively fixed to the two first mounting bosses (13); one end of the fuse (2) also extends into the first window (300) for being electrically connected to the positive terminal of the battery pack, and the other end of the fuse (2) is electrically connected to the low-voltage control end of a relay (4); the fuse (2) and the two first mounting bosses (13) are arranged in a gap near one end of the wire slot (100).

4. The elongated BDU structure according to claim 3, wherein, The plurality of relays (4) include a pre-charge relay (41), a main positive relay (42), a fast charge relay (43) and a main negative relay (44) which are arranged in sequence and at intervals; the pre-charge relay (41) is fixedly arranged on one side of a first mounting boss (13) close to the fuse (2) and away from the first window (300), and the pre-charge relay (41) does not exceed the end faces of the two first mounting bosses (13) away from the wire slot (100); the main positive relay (42), the fast charge relay (43) and the main negative relay (44) are arranged in sequence on the inner surface of the body (11) on both sides of the opening direction of the wire slot (100), and are fixedly connected to the body (11); one end of the fuse (2) away from the first window (300) is electrically connected to the first contact of the main positive relay (42) through the first bus bar (51), and the second contact of the main positive relay (42) is electrically connected to the first contact of the fast charge relay (43) through the second bus bar (52 ), the second bus (52) also extends into the third window (500) and is electrically connected to the positive terminal of the load circuit; the second contact of the fast charging relay (43) is electrically connected to one end of the third bus (53), and the other end of the third bus (53) extends into the fourth window (600) and is electrically connected to the positive terminal of the fast charging circuit; the first contact of the main negative relay (44) is electrically connected to one end of the fourth bus (54), and the other end of the fourth bus (54) extends into the fifth window (700) and is electrically connected to the negative terminal of the load circuit and the negative terminal of the fast charging circuit respectively; the second contact of the main negative relay (44) is electrically connected to one end of the fifth bus (55), and the other end of the fifth bus (55) passes through the current sensor (3) and extends into the second window (400) for being electrically connected to the negative terminal of the battery pack, and the current sensor (3) is arranged around the fifth bus (55).

5. A long and narrow BDU structure according to claim 4, characterized in that, A high-voltage collection connector (7) and a low-voltage control connector (8) are provided on one side of the body (11) near the second window (400); the high-voltage collection connector (7) and the low-voltage control connector (8) are both inserted into the body (11); a first wiring harness electrically connected to the low-voltage control end of each relay or the current sensor (3) is also electrically connected to the low-voltage control connector (8); and a second wiring harness electrically connected to a plurality of busbars (5) is also electrically connected to the high-voltage collection connector (7).

6. The elongated BDU structure according to claim 4, characterized in that, A pre-charging resistor (9) is provided at a gap between the fuse (2) and the end surface of the body (11) where the wire slot (100) is opened; a first contact of the pre-charging relay (41) is electrically connected to a first bus (51), a second contact of the pre-charging relay (41) is electrically connected to one end of the pre-charging resistor (9), and the other end of the pre-charging resistor (9) is electrically connected to a second bus (52).

7. A long and narrow BDU structure according to claim 4, characterized in that, The two first mounting bosses (13) are spaced at different distances from the bottom surface of the body (11).

8. The elongated BDU structure according to claim 4, characterized in that, It further includes a second mounting boss (14), the second mounting boss (14) is arranged on one side of the wire groove (100) and extends along a first preset direction; the second mounting boss (14) is flush with the ends of the third window (500), the fourth window (600) and the fifth window (700) away from the open end (200), and a plurality of fixing holes are arranged on the second mounting boss (14), and corresponding connecting holes are arranged on the second bus bar (52), the third bus bar (53) and the fourth bus bar (54), and the fixing holes and the connecting holes are arranged in one-to-one correspondence.

9. The elongated BDU structure according to claim 8, characterized in that, It further includes a third mounting boss (15), the third mounting boss (15) is arranged on the inner surface of the body (11) on the opposite side of the second mounting boss (14), and the end face of the third mounting boss (15) close to the second window (400) is flush with the end face of the second mounting boss (14) close to the second window (400); the end faces of the second mounting boss (14) and the third mounting boss (15) close to the second window (400) respectively abut against different positions of the end face of the current sensor (3).

10. A narrow BDU structure according to claim 1, characterized in that, The size of the wire groove (100) is larger than the diameters of a plurality of wire harnesses (6).

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