Input assembly for power transfer unit

Abstract

An input assembly for a power transfer unit is presented, comprising a set of busbars consisting of a positive busbar and a negative busbar, the positive bus bar and the negative bus bar each include an input terminal electrically connected to a stack of the fuel cell to receive a current from the stack, an output terminal electrically connected to the power transfer unit to transfer the current to the power transfer unit, and a body portion located between the respective input terminal and output terminal. The input assembly further includes an insulating housing surrounding respective body portions of the positive and negative busbars and at least partially filling a gap between the positive and negative busbars, wherein the functional elements of the input assembly are connected to the insulating housing and / or the set of busbars. The input assembly for the power transmission unit has the advantages of saving space and being convenient to assemble and maintain.

Description

TECHNICAL FIELD

[0001] The present utility model relates to a power transfer unit for fuel cells. In particular, it relates to an input assembly for a power transfer unit. BACKGROUND

[0002] Power transfer units (PTU) are widely used for power and signal transfer of fuel cells. Generally, a set of busbars (usually in the form of copper bars) is arranged between the stack of the fuel cell and the power transfer unit, including a positive busbar and a negative busbar, which transfers the current from the stack of the fuel cell to the power transfer unit, which can transfer the current as needed to various actuators powered by the fuel cell. The above-mentioned set of busbars is arranged at the input end of the power transfer unit, and considering the insulation requirement between the positive and negative busbars and the assembly convenience, the set of busbars is usually embedded into a component, so it is also called the input assembly of the power transfer unit.

[0003] Nowadays, the power transfer unit is designed to have more and more sub-components to realize different functions, and its structure is also more and more complex. The installation and positioning of various sub-components of the power transfer unit in the prior art do not make full use of the space where the input assembly, i.e. the positive and negative busbars, is located, resulting in that the arrangement of the input assembly is not compact enough, and further resulting in that the entire power transfer unit needs to occupy a larger space. In addition, the assembly and maintenance of the input assembly with a complex structure also exist difficulties for the operator.

[0004] Therefore, there is a need for an input assembly for a power transfer unit, which should overcome the shortcomings of complex structure and difficult assembly and maintenance existing in the prior art. SUMMARY

[0005] In order to achieve the above-mentioned purpose, the utility model provides an input assembly for a power transfer unit, which comprises a set of busbars composed of a positive busbar and a negative busbar, the positive busbar and the negative busbar each comprising an input end electrically connected to a stack of a fuel cell to receive current from the stack, an output end electrically connected to a power transfer unit to transfer the current to the power transfer unit, and a main body portion located between the respective input end and the output end. The input assembly further comprises an insulating housing surrounding the main body portion of the positive busbar and the negative busbar and at least partially filling the gap between the positive busbar and the negative busbar, wherein functional elements of the input assembly are connected to the insulating housing and / or the set of busbars.

[0006] The functional elements of the input assembly can include a current sensor attached to the insulating housing for measuring the output current of the stack, the current sensor comprising a sensor body formed with a coil opening, a coil for sensing the current being arranged inside the sensor body around the coil opening, wherein the coil opening is arranged adjacent to the stack and makes one of the positive busbar and the negative busbar pass through the coil opening.

[0007] A step portion can be provided in a body portion of a respective busbar of the set of busbars that passes through the coil opening, proximate to an input end of the respective busbar, the step portion being configured to protrude in a direction away from the stack, and the coil opening being arranged such that the step portion passes therethrough.

[0008] The positive busbar can include a positive busbar first extension extending from the body portion thereof, and the negative busbar can include a negative busbar first extension extending from the body portion thereof, and the functional elements of the input assembly can include a stack short circuit protection device attached to the insulating housing via the positive busbar first extension and the negative busbar first extension and electrically connected between the positive busbar and the negative busbar.

[0009] The positive busbar can include a positive busbar second extension extending from the body portion thereof and a positive busbar third extension extending from the input end thereof, and the negative busbar can include a negative busbar second extension extending from the body portion thereof, and the functional elements of the input assembly can include an electromagnetic shielding device including an X capacitor electrically connected between the positive busbar second extension and the negative busbar, a first set of Y capacitors electrically connected between the positive busbar third extension and ground, and a second set of Y capacitors electrically connected between the negative busbar second extension and ground.

[0010] The input end of the positive busbar can be formed with a first input end aperture and the input end of the negative busbar can be formed with a second input end aperture, and the functional elements of the input assembly can include a shroud attached to the insulating housing, the shroud being arranged at one side of the body portion of each of the positive busbar and the negative busbar and being open upward of the input end of each of the positive busbar and the negative busbar, and a bottom portion of the shroud being formed with a set of openings aligned with the first input end aperture and the second input end aperture, respectively.

[0011] The functional elements of the input assembly can include an open cover interlock device including a female end arranged at the shroud and a male end arranged at a housing cover of the power transfer unit, and the open cover interlock device being configured to disconnect the electrical connection between the stack and the set of busbars when the housing cover is opened.

[0012] The functional elements of the input assembly can include a voltage acquisition device disposed on the positive busbar adjacent to the stack, the voltage acquisition device being configured to acquire an output voltage of the stack.

[0013] The functional elements of the input assembly can include a wire management device disposed on the insulating housing and the shroud, the wire management device including a loop structure for gathering cables included in each of the functional elements and a bending structure for guiding the cables.

[0014] The insulating housing can include a plurality of attachment portions configured to be detachably attached to a housing of the power transfer unit. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A perspective view showing an input assembly for a power transmission unit according to one embodiment of the present invention;

[0016] Figure 2 Show the basis Figure 1 A perspective view of an input assembly for a power transfer unit of an embodiment of the present invention, wherein a shield in the input assembly is omitted;

[0017] Figure 3 Show the basis for observation from another perspective Figure 1 A perspective view of an input assembly for a power transfer unit according to an embodiment of the present invention;

[0018] Figure 4 Show the basis Figure 1 A top view of an input assembly for a power transfer unit of an embodiment of FIG.

[0019] Figure 5 A perspective view illustrating a set of busbars for an input assembly of a power transmission unit according to one embodiment of the present invention is shown. DETAILED DESCRIPTION

[0020] The following describes in detail the input assembly for the power transfer unit (PTU) according to the present invention with reference to the accompanying drawings. Figures 1 to 3 FIG. 1 is a perspective view showing an input assembly 10 for a power transmission unit according to an embodiment of the present invention. Figure 4 Show the basis Figure 1 The input assembly 10 according to the present invention mainly includes a set of busbars 100. The three-dimensional view of the busbars 100 is shown in FIG. Figure 5 It should be noted that Figure 1 1 shows a reference coordinate system XYZ, wherein the X-axis represents the length direction or the longitudinal direction, the Y-axis represents the width direction or the transverse direction, and the Z-axis represents the height direction or the vertical direction. The directions described in this article when describing each component are all referred to this coordinate system.

[0021] Reference Figure 5 The busbar set 100 consists of a positive busbar 110 and a negative busbar 120. Positive busbar 110 and negative busbar 120 are, for example, copper busbars that are electrically connected between the fuel cell stack and the power transmission unit, transmitting current from the fuel cell stack to the power transmission unit. Due to insulation requirements, a sufficient gap is provided between the positive busbar 110 and the negative busbar 120, and the two can be arranged parallel to each other.

[0022] like Figure 5As shown, the positive busbar 110 includes: an input end 111 electrically connected to the fuel cell stack to receive current from the stack; an output end 112 electrically connected to the power transmission unit to transmit current to the power transmission unit; and a main body 113 located between the input end 111 and the output end 112. Similarly, the negative busbar 120 includes: an input end 121 electrically connected to the fuel cell stack to receive current from the stack; an output end 122 electrically connected to the power transmission unit to transmit current to the power transmission unit; and a main body 123 located between the input end 121 and the output end 122.

[0023] like Figures 1 to 4 As shown, the input assembly 10 includes an insulating shell 200 that surrounds the main body portions 113, 123 of the positive busbar 110 and the negative busbar 120 respectively and at least partially fills the gap between the positive busbar 110 and the negative busbar 120. The insulating shell 200 can provide insulation between the positive busbar 110 and the negative busbar 120, and the insulating shell 200 can be used to position various functional elements of the input assembly 10 to be described below.

[0024] Figure 5 It is shown that the input end 111 and the output end 112 of the positive busbar 110 extend substantially vertically from the main body 113 thereof in opposite directions, and the input end 121 and the output end 122 of the negative busbar 120 extend substantially vertically from the main body 123 thereof in opposite directions, thereby forming a structure having a substantially "Z" cross-section. Such a structure facilitates the electrical connection of the input end 111 of the positive busbar 110 and the input end 121 of the negative busbar 120 to the fuel cell stack, respectively, and facilitates the electrical connection of the output end 112 of the positive busbar 110 and the output end 122 of the negative busbar 120 to the power transmission unit, respectively.

[0025] The input end 111 of the positive busbar 110 is formed with a first input end opening 111a which penetrates through the input end 111. Figure 5 Shown is a waist-shaped hole. Although not shown in the figure, an output wire of the stack is arranged below the input end 111 of the positive busbar 110, for example, also in the form of a copper busbar, which is formed with an opening intended to align with the input end opening 111a of the input end 111 of the positive busbar 110. In order to electrically connect the input end 111 of the positive busbar 110 to the stack, a bolt can be used to pass through the input end opening 111a of the input end 111 of the positive busbar 110 and the opening of the output wire of the stack and fixed with a nut below the output wire of the stack, thereby establishing an electrical connection between the input end 111 of the positive busbar 110 and the stack. Similarly, the input end 121 of the negative busbar 120 is formed with a second input end opening 121a that passes through it, which can also be formed as a waist-shaped hole. The bolts used for electrical connection between the positive busbar 110 and the negative busbar 120 and the stack are at Figure 2The connection between the positive busbar 110 and the stack is the same as that between the negative busbar 120 and the stack, and thus will not be described again. The waist-shaped holes 111a and 121a are arranged to allow the positive busbar 110 and the negative busbar 120 to be positioned relative to the stack with some adjustable space.

[0026] The output end 112 of the positive busbar 110 is formed with a first output end aperture 112a that penetrates through, as shown in Figure 5 Although not shown in the figure, an input lead of a power transmission unit, for example in the form of a copper bar, is arranged below the output end 112 of the positive busbar 110 and is formed with an aperture that is intended to be aligned with the first output end aperture 112a of the output end 112 of the positive busbar 110. In order to electrically connect the output end 112 of the positive busbar 110 to the power transmission unit, a bolt can be used to pass through the first output end aperture 112a of the output end 112 of the positive busbar 110 and the aperture of the input lead of the power transmission unit and be fixed below the input lead of the power transmission unit with a nut, thereby establishing an electrical connection between the output end 112 of the positive busbar 110 and the power transmission unit. Similarly, the output end 122 of the negative busbar 120 is formed with a second output end aperture 122a that penetrates through, which can also be formed as a circular aperture. The bolt for electrical connection between the positive busbar 110 and the negative busbar 120 and the power transmission unit is indicated by reference numerals 112b and 122b in Figure 2 The connection between the negative busbar 120 and the power transmission unit is the same as that between the positive busbar 110 and the power transmission unit, and thus will not be described again.

[0027] Figure 5 It is also shown that the main body part of the positive busbar 110 and the negative busbar 120 is respectively formed with a plurality of openings 113a and 123a Figure 5 Each of which is formed with two openings, but is not limited thereto, which are positioning holes for the positive busbar 110 and the negative busbar 120 in the molding process of the insulating housing 200, for example, openings formed as circles. Among them, the opening 113a immediately above the transition between the main body part 113 of the positive busbar 110 and the input end 111 also serves as an interface for fixing the voltage sampling device 800 (as shown in Figure 3 described below). Specifically, a riveting nut can be fixed in this opening 113a, and then a screw is engaged to the riveting nut through a positioning hole on the voltage sampling device 800, so that the voltage sampling device 800 can be fixed relative to the positive busbar 110.

[0028] In the input assembly 10 according to this embodiment, the input assembly 10 further comprises a plurality of functional elements connected to the insulating housing 200 and / or the set of busbars 100. A conventional set of positive and negative busbars as an input assembly of a power transfer unit only functions to transfer the current from the stack of the fuel cell to the power transfer unit, and the space where the set of busbars is located usually has the problem of low utilization. As the power transfer unit is designed to have more and more sub-components to achieve different functions, the applicant proposes to integrate these sub-components with the set of busbars and the insulating housing together to form the input assembly, i.e. to take these sub-components as functional elements of the input assembly, so as to make full use of the space where the set of busbars is located, and to achieve a compact input assembly for the power transfer unit.

[0029] The details of the arrangement of various functional elements of the input assembly 10 relative to the insulating housing 200 and / or the set of busbars 100 will be described below. Figures 1 to 4

[0030] As shown in Figure 2 , the functional elements of the input assembly 10 can include a current sensor 300 for measuring the output current of the stack, which can be a commercially available current sensor such as a fluxgate current sensor. The current sensor 300 is attached to the insulating housing 200 and includes a sensor body 310 formed with a coil opening 320, around which a coil for sensing the current is arranged inside the sensor body 310. Among them, the coil opening 320 is arranged adjacent to the stack and one of the positive busbar 110 and the negative busbar 120 passes through it, so that when the current flows through the positive busbar 110 and the negative busbar 120, the coil is electromagnetically induced to sense the size of the current. The coil opening 320 of the current sensor 300 is arranged as close to the stack as possible so that the measurement of the output current of the stack is more accurate.

[0031] The current sensor 300 is attached to the insulating housing 200. Specifically, the current sensor 300 can include a sensor mounting portion 311 intended to be attached to the insulating housing 200, which can be in the form of lugs extending from both sides of the sensor body 310 as shown in Figure 2 , the current sensor 300 can be attached to the insulating housing 200 by screwing through the sensor mounting portion 311.

[0032] Although Figure 2 the coil opening 320 of the current sensor 300 is shown to be arranged such that the negative busbar 120 passes through it, the present application is not limited thereto, and the coil opening 320 can alternatively be arranged such that the positive busbar 110 passes through it. The current sensor 300 is arranged such that the positive busbar 110 or the negative busbar 120 passes through its coil opening 320 depending on whether there is sufficient available space around the positive busbar 110 and the negative busbar 120.​

[0033] As shown in Figure 5 , a step portion 124 is provided in the main body portion 123 of the respective busbar (the negative busbar 120 is shown in the figure) of the set of busbars 100 that passes through the coil opening 320 of the current sensor 300, close to the input end 121 of the respective busbar. The step portion 124 is configured to protrude in the direction away from the stack (i.e. in the upward direction from below as shown in Figure 5 , which also corresponds to the Z-axis direction in Figure 1 ), and the coil opening 320 of the current sensor 300 is arranged such that the step portion 124 passes through the coil opening 320. In combination with Figure 5 and Figure 2 , the step portion 124 is provided such that the bottom end of the current sensor 300 is "lifted" to some extent upward relative to the stack, so that the current sensor 300 can be arranged as close as possible to the stack without interfering with the electrical connection between the stack and the set of busbars 100 (in particular the negative busbar 120). The height of the step portion 124 in the Z-axis direction depends on the dimensions of the current sensor 300, in particular the dimension of the bottom end of the current sensor 300 extending along the Z-axis below the negative busbar 120. The height of the step portion 124 can for example be in the range of 3-5 mm, for example 3.5 mm.

[0034] As already described earlier, the electrical connection between the input end 111 of the positive busbar 110 and the input end 121 of the negative busbar 120 and the stack is established by using the bolts 111b and 121b, respectively, through the first input end opening 111a of the input end 111 of the positive busbar 110 and the second input end opening 121a of the input end 121 of the negative busbar 120, and fixed with nuts below the openings of the output leads of the stack. In this case, since the bottom of the current sensor 300 is arranged below the negative busbar 120, it can interfere with the arrangement of the output leads of the stack that are located below the negative busbar 120. In order to prevent this possible interference, the input end 121 of the negative busbar 120 can be made longer in the Y-axis direction as shown in Figure 1 , so that the bottom of the current sensor 300 does not contact the output leads of the stack, but this increases the size of the negative busbar, and in turn the size of the entire input assembly in the width direction, i.e. in the Y-axis direction as shown in Figure 1 . The provision of the step portion 124 can overcome the above-mentioned drawbacks, both avoiding interference with the connection between the stack and the set of busbars 100, and reducing the size of the input assembly 10 in the width direction.

[0035] The input assembly 10 can further comprise a stack short circuit protection device 400, which can be a commercially available PCD (power close device) device. The fuel cell referred to herein is typically applied in an electric vehicle, in the event of a collision, the stack of the fuel cell can suffer impact such as extrusion, and if the stack is still in operation, there can be a risk of explosion, fire. The working principle of the stack short circuit protection device 400 is known in the art, briefly speaking, it is electrically connected between the positive busbar 110 and the negative busbar 120, and is configured to be in an open state when no collision event occurs to the electric vehicle, and when a collision occurs, it receives a collision signal from the airbag of the electric vehicle, which triggers the stack short circuit protection device 400 to switch to a closed state, so that the positive and negative poles of the stack are short-circuited, thereby avoiding the potential risk of explosion, fire.

[0036] In order to realize the installation of the stack short circuit protection device 400 and its electrical connection with the positive busbar 110 and the negative busbar 120, as shown in Figure 5 , the positive busbar 110 comprises a positive busbar first extension 114 extending from the main body part 113 thereof, and the negative busbar 120 comprises a negative busbar first extension 125 extending from the main body part 123 thereof. The positive busbar first extension 114 and the negative busbar first extension 125 can be formed with a flat mounting plate with openings as shown in Figure 5 . The stack short circuit protection device 400 is attached to the insulating housing 200 through the positive busbar first extension 114 and the negative busbar first extension 125 and is electrically connected between the positive busbar 110 and the negative busbar 120. Specifically, referring to Figure 5 , a rivet nut can be respectively fixed in the openings in the positive busbar first extension 114 and the negative busbar first extension 125, and further referring to Figure 1 , two screws can be used to engage the rivet nuts in the openings in the positive busbar first extension 114 and the negative busbar first extension 125 from one side of the input assembly 10 through positioning holes on the stack short circuit protection device 400, so that the stack short circuit protection device 400 is positioned between the positive busbar 110 and the negative busbar 120 and electrically connected to both.

[0037] It should be noted that the structure and extension direction of the positive busbar first extension 114 and the negative busbar first extension 125 are not limited to the embodiment shown in Figure 5 , but can be appropriately adjusted depending on the space available around the positive busbar 110 and the negative busbar 120 in the input assembly 10.

[0038] The input assembly 10 can further comprise an electromagnetic shielding device 500 configured to provide the required electromagnetic shielding between the stack and the power transmission unit. The electromagnetic shielding device 500 can be composed of commercially available capacitors for electromagnetic shielding. Specifically, as shown in Figure 2As shown, the electromagnetic shielding device 500 comprises an X-capacitor 510 electrically connected between the positive busbar 110 and the negative busbar 120, a first set of Y-capacitors 520 electrically connected between the positive busbar 110 and the ground, comprising a first large Y-capacitor 521 and a first small Y-capacitor 522, and a second set of Y-capacitors 530 electrically connected between the negative busbar 120 and the ground, comprising a second large Y-capacitor 531 and a second small Y-capacitor 532. The working principle of the individual capacitors of the electromagnetic shielding device 500 is known in the art and will therefore not be described in further detail.

[0039] The mounting of the electromagnetic shielding device 500 can be achieved by means of potting glue attaching it to the insulating housing 200. In particular, as shown in Figure 2 , the insulating housing 200 is formed with receiving chambers at the locations where the individual capacitors of the electromagnetic shielding device 500 are intended to be mounted, the surfaces of these receiving chambers intended to be in contact with the individual capacitors are coated with potting glue, then the individual capacitors are placed into the corresponding receiving chambers and fixed with respect to the insulating housing 200 by means of the potting glue. In order to achieve the electrical connection of the electromagnetic shielding device 500 with the positive busbar 110 and the negative busbar 120 and the grounding, as shown in Figure 5 , the positive busbar 110 comprises a positive busbar second extension 115 extending from the main body portion 113 thereof and a positive busbar third extension 116 extending from the input end 111 thereof, and the negative busbar 120 comprises a negative busbar second extension 126 extending from the main body portion 123 thereof. The positive busbar second extension 115, the positive busbar third extension 116 and the negative busbar second extension 126 can each be provided with a pin for electrical connection with the corresponding capacitor of the electromagnetic shielding device 500. In addition, pin(s) for electrical connection with the corresponding capacitor(s) of the electromagnetic shielding device 500 can also be provided on the insulating housing 200 at the locations adjacent to the first set of Y-capacitors 520 and the second set of Y-capacitors 530, respectively. The X-capacitor 510 is electrically connected between the positive busbar second extension 115 and the negative busbar 120, the first set of Y-capacitors 520 is electrically connected between the positive busbar third extension 116 and the ground, and the second set of Y-capacitors 530 is electrically connected between the negative busbar second extension 126 and the ground. Thus, the electromagnetic shielding device 500 collectively composed of the X-capacitor 510, the first set of Y-capacitors 520 and the second set of Y-capacitors 530 provides the required electromagnetic shielding between the stack and the power transfer unit.

[0040] The input assembly 10 can further comprise a shroud 600 attached to the insulating housing 200. The shroud 600 is made of an insulating material, for example by injection molding. As shown in Figure 1 , Figure 3 and Figure 4As shown, the shroud 600 is arranged on one side of the main body portions 113, 123 of the positive busbar 110 and the negative busbar 120 and is open upward of the input ends 111, 121 of the positive busbar 110 and the negative busbar 120. The bottom of the shroud 600 is formed with a set of openings 610 aligned with the first input end opening 111a of the input end 111 of the positive busbar and the second input end opening 121a of the input end 121 of the negative busbar, respectively. To electrically connect the input ends 111, 121 of the positive busbar 110 and the negative busbar 120 to the stack, a bolt can be used to pass through the set of openings 610 of the bottom of the shroud 600 and pass through the input end opening 111a of the input end 111 of the positive busbar 110 and the second input end opening 121a of the input end 121 of the negative busbar aligned with the set of openings 610, the opening of the output lead of the stack and be fixed with a nut below the output lead of the stack, thereby establishing an electrical connection between the input ends 111, 121 of the positive busbar 110 and the negative busbar 120 and the stack. As shown, the input assembly has a relatively large height dimension along the Z axis, and if the shroud 600 is not provided, the bolt is easy to be dropped in the narrow and deep operating space when the positive busbar 110 and the negative busbar 120 are electrically connected to the stack, and once dropped into the housing of the power transmission unit not shown in the figure, it can be difficult to be taken out. With the provision of the shroud 600, the inadvertent dropping of the bolt is avoided, thus facilitating the assembly and maintenance of the input assembly. Figure 1 As shown, the input assembly has a relatively large height dimension along the Z axis, and if the shroud 600 is not provided, the bolt is easy to be dropped in the narrow and deep operating space when the positive busbar 110 and the negative busbar 120 are electrically connected to the stack, and once dropped into the housing of the power transmission unit not shown in the figure, it can be difficult to be taken out. With the provision of the shroud 600, the inadvertent dropping of the bolt is avoided, thus facilitating the assembly and maintenance of the input assembly.

[0041] Figure 4 The shroud 600 is shown to further include a first fixing structure 620 intended to be attached to the insulating housing 200 and a second fixing structure 630 intended to be attached to the housing of the power transmission unit (not shown in the figure), Figure 4 Two second fixing structures 630 are shown in the middle. The first fixing structure 620 and the second fixing structure 630 can be fixed by screws, respectively. The positions, shapes and numbers of the first fixing structure 620 and the second fixing structure 630 can be adjusted accordingly depending on the configurations of the insulating housing 200 and the housing of the power transmission unit, respectively.

[0042] The input assembly 10 can further include an uncapping interlock device 700, as shown in Figure 3 and Figure 4The cover interlock device 700 includes a female end 710 arranged at the shroud 600 and a male end (not shown in the figure) arranged at the housing cover of the power transfer unit, and the cover interlock device 700 is configured to disconnect the electrical connection between the stack and the set of busbars 100 when the housing cover of the power transfer unit is opened. The cover interlock device 700 can employ commercially available connectors for cover interlock, and its function is known in the art. Briefly, the male and female ends of the cover interlock device 700 can be connected to the PCB board, which sends a signal to the PCB board when it detects that the housing cover of the power transfer unit is opened, and the PCB board can control the disconnection of the electrical connection between the stack and the set of busbars 100 upon receiving the signal. When the housing cover of the power transfer unit is opened, the operator can touch the busbars 100, for example, he needs to perform the assembly between the busbars 100 and the stack, at this time, if the electrical connection between the stack and the busbars 100 is not disconnected, there is a risk of electric shock during operation. By providing the cover interlock device 700, the electrical connection between the stack and the busbars 100 is automatically disconnected once the operator needs to open the housing of the power transfer unit for operation, thereby ensuring the safety of the operation.

[0043] The input assembly 10 can further include a voltage acquisition device 800 arranged on the positive busbar 110 adjacent to the stack, configured to acquire the output voltage of the stack, as shown in Figure 3 The voltage acquisition device 800 can be formed, for example, as a metal ring, such as a copper ring, which is attached tightly to the positive busbar 110 (as described above, by means of screws and rivet nuts) and is electrically connected to the PCB board, when the voltage sampling connector on the PCB is working, the voltage value acquired at the voltage acquisition device 800 is sent to the PCB board as the output voltage of the stack. As shown in Figure 3 The insulating housing 200 is formed with an opening portion 240 exposing the voltage acquisition device 800 at the position corresponding to the voltage acquisition device 800, so that the voltage acquisition device 800 can be fixed in the opening portion 240 by means of screws and corresponding rivet nuts in the positive busbar 110, thereby facilitating the installation of the voltage acquisition device 800.

[0044] The input assembly 10 can further include a wire management device 900 arranged on the insulating housing 200 and the shroud 600, as shown in Figure 3 The wire management device 900 includes a ring structure for collecting cables and a bending structure for guiding cables, wherein the cables involved are the cables contained by the functional elements of the input assembly 10, including the cable of the current sensor 300 for transmitting the current signal sensed thereby, the cable of the stack short circuit protection device 400 for receiving the impact signal, the cable of the cover interlock device 700 connected to the PCB board, etc. By means of the wire management device 900, the management of the cables is facilitated, and the maintenance of the components of the input assembly 10 by the operator is facilitated.

[0045] Figure 3 The periphery of the insulation housing 200 is shown to be provided with a ring-shaped structure 210 for gathering cables and a bending structure 220 for guiding the cables, which is formed as a plurality of L-shaped bending structures extending from the insulation housing 200, and the bending directions of adjacent L-shaped bending structures are opposite to each other to achieve the guiding and fixing of the cables. Figure 1 It is also shown that the periphery of the shroud 600, for example, the top thereof, is formed with a similar plurality of bending structures 640. It should be noted that the arrangement position of the wire arrangement device 900 and its configuration can be adjusted accordingly depending on the number and layout of the cables, without being limited to the form shown in Figure 3 and Figure 3 .

[0046] The insulation housing 200 can include a plurality of attachment portions 230 configured to be detachably attached to the housing of the power transmission unit, as shown in Figure 4 and Figures 1 to 4 . Each attachment portion 230 includes an opening through which the insulation housing 200 can be attached to the housing of the power transmission unit by means of a screw. By means of the plurality of attachment portions 230 of the insulation housing 200 and the two second fixing structures 630 of the shroud 600, the entire input assembly 10 can be detachably attached to the housing of the power transmission unit. It should be noted that the number, positioning and configuration of the attachment portions 230 of the insulation housing 200 can be adjusted accordingly depending on the configuration of the housing of the power transmission unit, without being limited to the form shown in Figure 1 .

[0047] The input assembly 10 for the power transmission unit according to the present application is described in detail above in combination with the various figures, which has a compact structure. Specifically, in the XYZ coordinate axes shown in Figures 1 to 5 , the input assembly 10 has a length of about 200 mm, a width of about 100 mm, and a height of about 120 mm. The input assembly 10 realizes a plurality of functions as described above in a compact structure, achieving the advantages of saving space, facilitating assembly and maintenance, etc.

[0048] It should be noted that, ​Only one embodiment of the input assembly for a power transmission unit according to the present invention is shown, however, the arrangement of the various components of the input assembly can be appropriately modified. For example, as previously described, the figure shows that the current sensor 300 is arranged so that the negative bus 120 passes through its coil opening 320, but in an alternative embodiment, it is also feasible to arrange it so that the positive bus 110 passes through its coil opening 320. In this alternative embodiment, the arrangement positions of the other functional elements of the input assembly 10 also need to be adjusted accordingly with the adjustment of the arrangement position of the current sensor 300. Appropriate adjustment of the arrangement positions of the various functional elements of the input assembly 10 should be considered to fall within the scope of the present invention.

[0049] The above describes in detail a feasible but non-limiting embodiment of the input component for the power transmission unit according to the present invention with the help of the accompanying drawings. For those skilled in the art, without departing from the scope and spirit of the present disclosure as set forth in the following claims, modifications and supplements to the technology and structure and the re-combination of the features in each embodiment should obviously be considered to be included in the scope of the present invention. Therefore, these modifications and supplements that can be conceived under the teachings of the present invention should be considered as part of the present disclosure. The scope of the present disclosure is defined by the claims attached below, and includes equivalent technologies known at the filing date of the present disclosure and equivalent technologies that have not yet been foreseen.

Claims

1. An input assembly (10) for a power transmission unit, the input assembly (10) comprising a set of busbars (100) consisting of a positive busbar (110) and a negative busbar (120), each of the positive busbar (110) and the negative busbar (120) comprising an input end electrically connected to a fuel cell stack to receive current from the stack, an output end electrically connected to the power transmission unit to transmit current to the power transmission unit, and a main body located between the respective input end and output end, It is characterized by: The input assembly (10) includes an insulating housing (200) surrounding the main body of each of the positive busbar (110) and the negative busbar (120) and at least partially filling a gap between the positive busbar (110) and the negative busbar (120), wherein functional elements of the input assembly (10) are connected to the insulating housing (200) and / or the set of busbars (100).

2. The input assembly (10) according to claim 1, characterized in that The functional element of the input assembly includes a current sensor (300) attached to the insulating housing (200) for measuring the output current of the battery stack, the current sensor (300) including a sensor body (310) formed with a coil opening (320), a coil for sensing current being arranged inside the sensor body (310) around the coil opening (320), wherein the coil opening (320) is arranged adjacent to the battery stack and allows one of the positive busbar (110) and the negative busbar (120) to pass through the coil opening (320).

3. The input assembly (10) according to claim 2, characterized in that A step portion (124) is provided in the main body of a corresponding busbar in the group of busbars (100) that passes through the coil opening (320) near the input end of the corresponding busbar, the step portion (124) being configured to protrude in a direction away from the battery stack, and the coil opening (320) being arranged so that the step portion (124) passes through the coil opening (320).

4. The input assembly (10) according to any one of claims 1 to 3, characterized in that The positive busbar (110) includes a positive busbar first extension portion (114) extending from a main portion thereof, and the negative busbar (120) includes a negative busbar first extension portion (125) extending from a main portion thereof, and The functional elements of the input assembly (10) include a stack short-circuit protection device (400), which is attached to the insulating housing (200) through the positive busbar first extension (114) and the negative busbar first extension (125) and is electrically connected between the positive busbar (110) and the negative busbar (120).

5. The input assembly (10) according to any one of claims 1 to 3, characterized in that The positive busbar (110) includes a positive busbar second extension portion (115) extending from its main portion and a positive busbar third extension portion (116) extending from its input end, and the negative busbar (120) includes a negative busbar second extension portion (126) extending from its main portion, and The functional element of the input assembly (10) includes an electromagnetic shielding device (500), which includes an X capacitor (510) electrically connected between the second extension portion (115) of the positive busbar and the negative busbar (120), a first group of Y capacitors (520) electrically connected between the third extension portion (116) of the positive busbar and the ground, and a second group of Y capacitors (530) electrically connected between the second extension portion (126) of the negative busbar and the ground.

6. The input assembly (10) according to any one of claims 1 to 3, characterized in that The input end of the positive busbar (110) is formed with a first input end opening (111a) and the input end of the negative busbar (120) is formed with a second input end opening (121a), and The functional element of the input assembly (10) includes a shield (600) attached to the insulating housing (200), the shield (600) being arranged on one side of the main body of each of the positive busbar (110) and the negative busbar (120) and opening upward above the input end of each of the positive busbar (110) and the negative busbar (120), and a group of openings (610) aligned with the first input end opening (111a) and the second input end opening (121a) are formed at the bottom of the shield (600).

7. The input assembly (10) according to claim 6, characterized in that The functional element of the input assembly (10) includes a cover-opening interlocking device (700), the cover-opening interlocking device (700) includes a female end (710) arranged at the shield (600) and a male end arranged at the housing cover of the power transmission unit, and the cover-opening interlocking device (700) is configured to disconnect the electrical connection between the battery stack and the set of busbars (100) when the housing cover is opened.

8. The input assembly (10) according to any one of claims 1 to 3, characterized in that The functional element of the input assembly (10) includes a voltage collection device (800) arranged on the positive busbar (110) adjacent to the battery stack and configured to collect the output voltage of the battery stack.

9. The input assembly (10) according to claim 6, characterized in that The functional element of the input assembly (10) includes a wire management device (900) arranged on the insulating housing (200) and the shield (600), and the wire management device (900) includes a ring structure for gathering cables included in the functional element and a bending structure for guiding the cables.

10. The input assembly (10) according to any one of claims 1 to 3, characterized in that The insulating housing (200) includes a plurality of attachment portions (230) configured to be detachably attached to a housing of the power transmission unit.

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