Input assembly for a power transmission unit

Abstract

Provided is an input assembly for a power transmission unit comprising a group of busbars consisting of a positive busbar and a negative busbar, wherein the positive busbar and the negative busbar each comprise an input end electrically connected to a stack of fuel cells to receive power from the stack, an output end electrically connected to the power transmission unit to transfer the power to the power transmission unit, and a main body section situated between a corresponding input end and a corresponding output end.The input assembly further comprises an insulating housing that surrounds the respective main body sections of the positive and negative busbars and at least partially fills a gap between the positive and negative busbars, with functional elements of the input assembly being connected to the insulating housing and / or the group of busbars. The input assembly for a power transmission unit according to the present utility model offers the advantages of space saving and simple assembly and maintenance.

Description

Technical field

[0001] The present utility model relates to a power transmission unit for a fuel cell. In particular, it relates to an input assembly for a power transmission unit. State of the art

[0002] Power transmission units (PTUs) are widely used for power and signal transmission from fuel cells. Typically, a busbar system (usually in the form of a copper busbar) is located between a stack of fuel cells and the power transmission unit. This busbar system transmits power from the fuel cell stack to the power transmission unit, which can then distribute the power as needed to various actuators powered by the fuel cells. The busbar system is located at one input end of the power transmission unit.Taking into account the insulation requirement between the positive busbar and the negative busbar, as well as the ease of assembly, this group of busbars is usually formed as a single assembly, which is also referred to as the input assembly of the power transmission unit.

[0003] Currently, power transmission units are designed with an increasing number of subcomponents to perform various functions, resulting in an ever more complex structure. In the prior art, the space occupied by the input assembly (i.e., the positive and negative busbars) is not fully utilized due to the mounting and positioning of the various subcomponents of the power transmission unit. This leads to a less compact arrangement of the input assembly, causing the entire power transmission unit to require more space. Furthermore, the assembly and maintenance of input assemblies with complex structures is also difficult for operators.

[0004] Therefore, there is a need for an input assembly for a power transmission unit that overcomes the disadvantages of structural complexity, difficult composition, and maintenance in the state of the art. Disclosure of the utility model

[0005] To solve the aforementioned problem, the present utility model provides an input assembly for a power transmission unit, comprising a group of busbars consisting of a positive busbar and a negative busbar, wherein the positive busbar and the negative busbar each comprise an input end electrically connected to a stack of fuel cells to receive power from the stack, an output end electrically connected to the power transmission unit to transfer the power to the power transmission unit, and a main body section situated between a corresponding input end and a corresponding output end.The input assembly further comprises an insulating housing that surrounds the respective main body sections of the positive busbar and the negative busbar and at least partially fills a gap between the positive busbar and the negative busbar, with functional elements of the input assembly being connected to the insulating housing and / or the group of busbars.

[0006] The functional elements of the input assembly may include a current sensor attached to the insulating housing and used to measure an output current of the stack, wherein the current sensor comprises a sensor body having a coil opening, a coil for detecting the current within the sensor body being arranged around the coil opening, and wherein the coil opening is provided near the stack and allows a current from the positive busbar and the negative busbar to pass through the coil opening.

[0007] In the main body section of a corresponding busbar of the group of busbars passing through the coil opening, a step section may be provided near the input end of that corresponding busbar, the step section being configured to project away from the stack in one direction, and the coil opening being such that the step section passes through the coil opening. The positive busbar may include a first extension section of the positive busbar extending from its main body section. The negative busbar may include a first extension section of the negative busbar extending from its main body section.The functional elements of the input assembly may include a stack short-circuit protection device, wherein the stack short-circuit protection device is mounted on the insulating housing over the first extension section of the positive busbar and the first extension section of the negative busbar and is electrically connected between the positive busbar and the negative busbar.

[0008] The positive busbar can include a second extension section extending from its main body section and a third extension section extending from its input end. The negative busbar can include a second extension section extending from its main body section.The functional elements of the input assembly may include an electromagnetic shielding device, wherein the electromagnetic shielding device comprises an X-capacitor electrically connected between the second extension section of the positive busbar and the negative busbar, a first group of Y-capacitors electrically connected between the third extension section of the positive busbar and earth, and a second group of Y-capacitors electrically connected between the second extension section of the negative busbar and earth.

[0009] A first input end opening can be formed at the input end of the positive busbar, and a second input end opening can be formed at the input end of the negative busbar. The functional elements of the input assembly can include a protective cover attached to the insulating housing, wherein the protective cover is arranged on one side of the respective main body sections of the positive and negative busbars and is open in an upward direction towards the respective input ends of the positive and negative busbars, and wherein a group of openings is formed at the bottom of the protective cover, each aligned with the first and second input end openings.

[0010] The functional elements of the input assembly may include a cover-opening locking device, wherein the cover-opening locking device comprises a female end located on the protective hood and a male end located on a housing cover of the power transmission unit, and wherein the cover-opening locking device is configured to disconnect the electrical connection between the stack and the group of busbars as soon as the housing cover is opened.

[0011] The functional elements of the input assembly may include a voltage sensing device located on the positive busbar and near the stack, and configured to detect the output voltage of the stack.

[0012] The functional elements of the input assembly may include a wiring device arranged on the insulating housing and protective hood, the wiring device comprising a ring-shaped structure for collecting cables contained in the individual functional elements and a curved structure for guiding the cables.

[0013] The insulating housing can include multiple mounting sections configured to be detachably attached to the housing of the power transmission unit. Brief description of the characters Fig. Figure 1 shows a perspective view of an input assembly for a power transmission unit according to an embodiment of the present utility model; Fig. Figure 2 shows a perspective view of the input assembly for a power transmission unit according to the embodiment shown in Fig. 1, omitting a protective cover for the input assembly; Fig. Figure 3 shows a perspective view of the input assembly for a power transmission unit according to the embodiment shown in Fig. 1. From a different perspective; Fig. Figure 4 shows a top view of the input assembly for a power transmission unit according to the embodiment shown in Fig. 1; and Fig. Figure 5 shows a perspective view of a group of busbars of the input assembly for a power transmission unit according to an embodiment of the present utility model. Detailed descriptions

[0014] The following is a detailed description of an input assembly for a power transmission unit (PTU) according to the present utility model, with reference to the accompanying drawings. Fig. 1, Fig. 2 to Fig. 3 perspective views of an input assembly 10 for a power transmission unit according to an embodiment of the present utility model, and Fig. Figure 4 shows a top view of the input assembly 10 according to the embodiment shown in Fig. 1. The input assembly 10 according to the present utility model comprises, in particular, a group of busbars 100. A perspective view of this group of busbars 100 is shown in Fig. 5 is shown. It should be noted that in Fig. Figure 1 shows an XYZ reference coordinate system, where the X-axis represents a length direction, the Y-axis a width direction, and the Z-axis a height direction. All directions used in describing the individual components refer to this coordinate system.

[0015] With reference to Fig. 5. The group of busbars 100 consists of a positive busbar 110 and a negative busbar 120. The positive busbar 110 and the negative busbar 120 are, for example, manufactured as copper busbars that are electrically connected between a stack of fuel cells and the power transmission unit and serve to transmit the current from the stack of fuel cells to the power transmission unit. To meet the insulation requirement, a sufficient gap is provided between the positive busbar 110 and the negative busbar 120, whereby the two busbars can be arranged parallel to each other.

[0016] As in Fig. As shown in Figure 5, the positive busbar 110 comprises: an input end 111, which is electrically connected to the stack to receive current from the stack; an output end 112, which is electrically connected to the power transmission unit to transfer the current to the power transmission unit; and a main body section 113 located between the input end 111 and the output end 112. Similarly, the negative busbar 120 comprises: an input end 121, which is electrically connected to the stack of fuel cells to receive current from the stack; an output end 122, which is electrically connected to the power transmission unit to transfer the current to the power transmission unit; and a main body section 123 located between the input end 121 and the output end 122.

[0017] As in Fig. 1, Fig. 2, Fig. 3 to Fig. As shown in Figure 4, the input assembly 10 comprises an insulating housing 200 that surrounds the respective main body sections 113, 123 of the positive busbar 110 and the negative busbar 120 and at least partially fills the gap between the positive busbar 110 and the negative busbar 120, wherein the insulating housing 200 can provide insulation between the positive busbar 110 and the negative busbar 120, and wherein the insulating housing 200 can be used to position various functional elements of the input assembly 10 described below.

[0018] The Fig. It can be seen from Figure 5 that the input end 111 and the output end 112 of the positive busbar 110 each extend in opposite directions and substantially perpendicularly from its main body section 113; and that the input end 121 and the output end 122 of the negative busbar 120 each extend in opposite directions and substantially perpendicularly from its main body section 123, each forming a structure with a substantially "Z"-shaped cross-section. Such structures facilitate an electrical connection of the input end 111 of the positive busbar 110 and the input end 121 of the negative busbar 120 each to the stack, as well as an electrical connection of the output end 112 of the positive busbar 110 and the output end 122 of the negative busbar 120 each to the power transmission unit.

[0019] At the input end 111 of the positive busbar 110, a continuous first input end opening 111a is formed, which, as in Fig. Figure 5 shows a waist-shaped hole. Although not shown in the figures, an output line of the stack is arranged below the input end 111 of the positive busbar 110. The output line is, for example, also in the form of a copper busbar with an opening for alignment with the input end opening 111a of the input end 111 of the positive busbar 110. To electrically connect the input end 111 of the positive busbar 110 to the stack, a bolt can be used that passes through the input end opening 111a of the input end 111 of the positive busbar 110 and the opening of the output line of the stack and is secured below the output line of the stack with a nut. This establishes an electrical connection between the input end 111 of the positive busbar 110 and the stack.Similarly, a continuous second input end opening 121a is formed at the input end 121 of the negative busbar 120, which can also be designed as a waist-shaped hole. The bolts used for the electrical connection between the positive busbar 110 or the negative busbar 120 on the one hand and the stack on the other hand are in . Fig. 2 are labelled with reference numbers 111b and 121b. The method for connecting the negative busbar 120 to the stack is identical to that for the positive busbar 110. Therefore, it will not be discussed further. The provision of the waist-shaped holes 111a and 121a allows for some adjustability in the positioning of the positive busbar 110 and the negative busbar 120 relative to the stack.

[0020] At the output end 112 of the positive busbar 110, a continuous first output end opening 112a is formed, which, as in Fig. Figure 5 shows a round hole. Although not shown in the figures, an input line of the power transmission unit is arranged below the output end 112 of the positive busbar 110. The input line is, for example, in the form of a copper busbar with an opening for alignment with the first output end opening 112a of the output end 112 of the positive busbar 110. To electrically connect the output end 112 of the positive busbar 110 to the power transmission unit, a bolt can be used that passes through the first output end opening 112a of the output end 112 of the positive busbar 110 and the opening of the input line of the power transmission unit and is secured with a nut below the input line of the power transmission unit.This establishes an electrical connection between the output end 112 of the positive busbar 110 and the power transmission unit. Similarly, a continuous second output opening 122a is formed at the output end 122 of the negative busbar 120, which can also be a round hole. The bolts used for the electrical connection between the positive busbar 110 or the negative busbar 120 on the one hand and the power transmission unit on the other are shown in . Fig. 2, designated with reference numbers 112b and 122b. The method for connecting the negative busbar 120 to the power transmission unit is identical to that for the positive busbar 110. Therefore, it will not be discussed further.

[0021] Furthermore, the Fig. 5 shows that several openings 113a and 123a are formed on the respective main body section of the positive busbar 110 and the negative busbar 120, respectively (In Fig. Figure 5 shows that two openings are formed in each case. However, this is not limited to this. During the forming process of the insulating housing 200, these openings serve as positioning holes for the positive busbar 110 and the negative busbar 120, with these openings being, for example, round openings. The opening 113a, which is located directly above the transition between the main body section 113 and the input end 111 of the positive busbar 110, also serves as a connection for attaching a voltage sensing device 800 described below (as in Figure 5). Fig. (3 shown). In particular, a rivet nut can be attached in this opening 113a. Then a screw is used which passes through a positioning hole on the voltage sensing device 800 and engages in this rivet nut. This allows the voltage sensing device 800 to be fixed relative to the positive busbar 110.

[0022] In the input assembly 10 according to this embodiment, the input assembly 10 further comprises several functional elements that are connected to the insulating housing 200 and / or the group of busbars 100. A conventional group of a positive busbar and a negative busbar serving as the input assembly of the power transmission unit has only one function: to transfer power from the stack of fuel cells to the power transmission unit. The space occupied by this group of busbars is generally used insufficiently.With an increasing number of subcomponents integrated into the design of the power transmission unit to achieve various functions, the applicant proposes integrating these subcomponents, this group of busbars, and the insulating housing into an input assembly; that is, these subcomponents serve as functional elements of the input assembly. This allows the space occupied by this group of busbars to be utilized and a compact input assembly for the power transmission unit to be achieved.

[0023] The following describes the arrangement of various functional elements of the input assembly 10 relative to the insulating housing 200 and / or the group of busbars 100 in connection with Fig. 1, Fig. 2, Fig. 3 to Fig. 4 described in detail.

[0024] As in Fig. 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 mounted on the insulating housing 200 and comprises a sensor body 310 in which a coil opening 320 is formed. A coil for detecting the current within the sensor body 310 is arranged around the coil opening 320. The coil opening 320 is located near the stack, through which a conductor from the positive busbar 110 and the negative busbar 120 passes. This generates an electromagnetic induction in the coil when current flows through the positive busbar 110 and the negative busbar 120. In this way, the current magnitude is detected.The coil opening 320 of the current sensor 300 is positioned as close as possible to the stack in order to achieve a more accurate measurement of the output current of the stack.

[0025] The current sensor 300 is attached to the insulating housing 200. In particular, the current sensor 300 can include sensor mounting sections 311 designed for attachment to the insulating housing 200. These sensor mounting sections 311 can be in the form of tabs projecting from both sides of the sensor body 310, as shown in Fig. 2 shown, whereby screws can be used which are passed through these sensor mounting sections 311 to attach the current sensor 300 to the insulating housing 200.

[0026] Although the in Fig. The present utility model is not limited to the coil opening 320 of the current sensor 300 shown in Figure 2 being configured so that the negative busbar 120 passes through it. The coil opening 320 can alternatively be configured so that the positive busbar 110 passes through it. The current sensor 300 is arranged such that either the positive busbar 110 or the negative busbar 120 passes through the coil opening 320 of the current sensor. This depends on whether there is sufficient available space around the positive busbar 110 or the negative busbar 120, respectively.

[0027] As in Fig. As shown in Figure 5, a stage section 124 is provided in the main body section 123 of a corresponding busbar (in the figure, the negative busbar 120) of the group of busbars 100 that passes through the coil opening 320 of the current sensor 300, near the input end 121 of this corresponding busbar. The stage section 124 is configured to extend in a direction away from the stack (i.e., in a direction in Fig. 5 upward direction shown, which also corresponds to the direction of the Z-axis in Fig. 1 corresponds) protrudes, and the coil opening 320 of the current sensor 300 is designed such that the stage section 124 passes through the coil opening 320. In connection with Fig. 5 and Fig. The requirement 2 is met by providing the stepped section 124, which raises the lower end of the current sensor 300 relative to the stack to a certain extent. This allows the current sensor 300 to be positioned as close as possible to the stack without interfering with the electrical connection between the stack and the group of busbars 100 (especially the negative busbar 120). The height of the stepped section 124 along the Z-axis depends on the dimensions of the current sensor 200. This depends, in particular, on the dimension by which the lower end of the current sensor 300 extends along the Z-axis below the negative busbar 120. The height of the stepped section 124 can, for example, be in the range of 3 to 5 mm, such as 3.5 mm.

[0028] By guiding the bolts 111b and 121b, as described above, 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, as well as through the openings of the output line of the stack, and securing them with a nut under the output line of the stack, an electrical connection is established between the input end 111 of the positive busbar 110 and the input end 121 of the negative busbar 120, respectively, and the stack. In this case, the arrangement of the lower part of the current sensor 300 under the negative busbar 120 could interfere with the arrangement of the output line of the stack under the negative busbar 120. To prevent this potential interference, the input end 121 of the negative busbar 120 can be installed in a manner described above. Fig. The Y-axis direction shown in Figure 1 is made longer, so that the lower part of the current sensor 300 does not come into contact with the output line of the stack. However, this increases the dimensions of the negative busbar, thus increasing the overall width of the input assembly, i.e., in the direction shown in Figure 1. Fig. The dimension shown in Figure 1 along the Y-axis is increased, resulting in a less compact input assembly. The aforementioned disadvantages can be overcome by providing the stepped section 124. Firstly, it prevents any impairment of the connection between the stack and the group of busbars 100. Secondly, it reduces the width dimension of the input assembly 10.

[0029] The input assembly 10 may further include a stack short-circuit protection device 400, which may be a commercially available PCD (power close device). The fuel cells mentioned herein are typically used in electric vehicles. In the event of a collision, the stack of fuel cells could be subjected to impacts such as crushing. If the stack remains functional, this could lead to an explosion or fire hazard. The operating principle of the stack short-circuit protection device 400 is known in this field. Simply put, it is electrically connected between the positive busbar 110 and the negative busbar 120 and is configured to remain in an open state when no collision occurs in the electric vehicle.In the event of a collision, the stack short-circuit protection device receives a collision signal from the electric vehicle's airbags, which triggers the switching of the stack short-circuit protection device 400 to a closed state, resulting in a short circuit between the positive and negative electrodes of the stack. This can prevent a potential explosion or fire hazard.

[0030] To enable the assembly of the stack short-circuit protection device 400 and its electrical connection with the positive busbar 110 and the negative busbar 120, the positive busbar 110 comprises a first extension section 114 of the positive busbar extending from its main body section 113, and the negative busbar 120 comprises a first extension section 125 of the negative busbar extending from its main body section 123, as shown in Fig. 5 shown. The first extension section 114 of the positive busbar and the first extension section 125 of the negative busbar can each be designed as a flat mounting plate with an opening, as shown in Fig. Figure 5 shows the stack short-circuit protection device 400. It is mounted on the insulating housing 200 via the first extension section 114 of the positive busbar and the first extension section 125 of the negative busbar and is electrically connected between the positive busbar 110 and the negative busbar 120. With reference to Fig. 5. In particular, rivet nuts can be fastened in the openings of the first extension section 114 of the positive busbar and the first extension section 125 of the negative busbar. With further reference to Fig. 1. Two screws can be used, each passing from one side of the input assembly 10 through the positioning holes on the stack short-circuit protection device 400 and engaging the rivet nuts in the openings of the first extension section 114 of the positive busbar and the first extension section 125 of the negative busbar. This positions the stack short-circuit protection device 400 between the positive busbar 110 and the negative busbar 120 and electrically connects them.

[0031] It should be noted that the structure and extension direction of the first extension section 114 of the positive busbar and the first extension section 125 of the negative busbar do not correspond to the one in Fig. The embodiment shown in 5 is limited, but can be adapted accordingly in the input assembly 10 depending on the available space around the positive busbar 110 and the negative busbar 120.

[0032] The input assembly 10 may further comprise an electromagnetic shielding device 500 configured to provide the necessary electromagnetic shielding between the stack and the power transmission unit. The electromagnetic shielding device 500 may include commercially available capacitors for electromagnetic shielding. As shown in Fig. As shown in Figure 2, the electromagnetic shielding device 500 comprises, in particular: an X-capacitor 510 electrically connected between the positive busbar 110 and the negative busbar 120; a first group of Y-capacitors 520 electrically connected between the positive busbar 110 and ground, comprising a first large Y-capacitor 521 and a first small Y-capacitor 522; and a second group of Y-capacitors 530 electrically connected between the negative busbar 120 and ground, comprising a second large Y-capacitor 531 and a second small Y-capacitor 532. The operating principle of the individual capacitors of the electromagnetic shielding device 500 is known in the field and is therefore not discussed here.

[0033] The electromagnetic shielding device 500 can be mounted by attaching it to the insulating housing 200 using a potting compound. As shown in Fig. As shown in Figure 2, receiving chambers are formed on the insulating housing 200, particularly at the positions where the respective capacitors of the electromagnetic shielding device 500 are to be mounted. The surfaces of these receiving chambers, which are to come into contact with the respective capacitors, are coated with potting compound. The respective capacitors are then inserted into the corresponding receiving chambers and secured relative to the insulating housing 200 by means of the potting compound. To establish the electrical connection of the electromagnetic shielding device 500 with the positive busbar 110 and the negative busbar 120, as well as with ground, the positive busbar 110 comprises, as shown in Figure 2, a positive busbar 110. Fig. Figure 5 shows a second extension section 115 of the positive busbar extending from its main body section 113, and a third extension section 116 of the positive busbar extending from its input end 111. The negative busbar 120 comprises a second extension section 126 extending from its main body section 123. The second extension section 115 of the positive busbar, the third extension section 116 of the positive busbar, and the second extension section 126 of the negative busbar can each be provided with pins for electrical connection to a corresponding capacitor of the electromagnetic shielding device 500.Additionally, pins for electrical connection to a corresponding capacitor of the electromagnetic shielding device 500 can be provided on the insulating housing 200 at positions near the first group of Y-capacitors 520 and the second group of Y-capacitors 530. The X-capacitor 510 is electrically connected between the second extension section 115 of the positive busbar and the negative busbar 120. The first group of Y-capacitors 520 is electrically connected between the third extension section 116 of the positive busbar and ground. The second group of Y-capacitors 530 is electrically connected between the second extension section 126 of the negative busbar and ground.Therefore, the electromagnetic shielding device 500, composed of the X-capacitor 510, the first group of Y-capacitors 520, and the second group of Y-capacitors 530, provides the necessary electromagnetic shielding between the stack and the power transmission unit. The input assembly 10 may further comprise a protective cover 600 attached to the insulating housing 200. The protective cover 600 is made of insulating material, for example, by injection molding. As shown in . Fig. 1, Fig. 3 and Fig. As shown in Figure 4, the protective cover 600 is arranged on one side of the respective main body sections 113, 123 of the positive busbar 110 and the negative busbar 120 and is open in an upward direction towards the respective input ends 111, 121 of the positive busbar 110 and the negative busbar 120. A group of openings 610 is formed on the bottom of the protective cover 600, each 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.To electrically connect the input end 111 of the positive busbar 110 and the input end 121 of the negative busbar 120 to the stack, bolts can be used, each passed through the group of openings 610 on the bottom of the protective cover 600, through the input end opening 111a of the input end 111 of the positive busbar 110, and through the second input end opening 121a of the input end 121 of the negative busbar, which are aligned with this group of openings 610, as well as through the openings of the output line of the stack, and secured under the output line of the stack with a nut. This establishes an electrical connection between the input end 111 of the positive busbar 110 and the input end 121 of the negative busbar 120, respectively, and the stack. As shown in... Fig. As shown in Figure 1, the input assembly has a relatively large height dimension along the Z-axis. Without a protective cover 600, bolts can easily fall out in a confined and deep working space when the positive busbar 110 and the negative busbar 120 are connected to the stack. If such bolts fall into the housing (not shown in the figures) of the power transmission unit, they could be difficult to retrieve. Providing the protective cover 600 prevents accidental bolt falls and therefore simplifies the assembly and maintenance of the input assembly.

[0034] The Fig. Figure 4 shows that the protective hood 600 further comprises a first mounting structure 620 for attachment to the insulating housing 200 and a second mounting structure 630 for attachment to the housing (not shown in the figures) of the power transmission unit. Fig. Figure 4 shows two second mounting structures 630. The first mounting structure 620 and the second mounting structure 630 can each be fastened with screws. The position, shape, and number of the first mounting structure 620 and the second mounting structure 630 can each be adapted according to the design of the insulating housing 200 and the housing of the power transmission unit.

[0035] The inlet assembly 10 can further comprise a locking device 700 caused by a lid opening, as shown in Fig. 3 and Fig. Figure 4 shows the cover-opening locking device 700, which comprises a female end 710 located on the protective cover 600 and a male end (not shown) located on a housing cover of the power transmission unit. The cover-opening locking device 700 is configured to disconnect the electrical connection between the stack and the group of busbars 100 as soon as the housing cover of the power transmission unit is opened. Commercially available cover-opening locking connectors, the operation of which is known in the field, can be used for the cover-opening locking device 700. In simple terms, the male and female ends of the cover-opening locking device 700 can be connected to a PCB board.When the locking device, triggered by the lid opening, detects that the power transmission unit's housing cover has been opened, it sends a signal to the PCB. Upon receiving this signal, the PCB can control the disconnection of the electrical connection between the stack and the group of busbars 100. When the power transmission unit's housing cover is opened, an operator may come into contact with the busbars 100, for example, to assemble them with the stack. If the electrical connection between the stack and the busbars 100 is not disconnected in this case, there is a risk of electric shock during operation.The locking device 700, activated by opening the cover, automatically disconnects the electrical connection between the stack and the busbars 100 as soon as an operator needs to open the power transmission unit housing for operation. This ensures operational safety.

[0036] The input assembly 10 can further comprise a voltage sensing device 800, which is arranged on the positive busbar 110 and near the stack and is configured to sensing the output voltage of the stack, as shown in Fig. Figure 3 shows the voltage sensing device 800. The voltage sensing device 800 can, for example, be designed as a metal ring, such as a copper ring, which is tightly fitted to and attached to the positive busbar 110 (as described above, this can be achieved using a screw and a rivet nut) and electrically connected to the PCB. When a voltage sensing connector on the PCB is in operation, the voltage value detected by the voltage sensing device 800 is sent to the PCB as the output voltage of the stack. As shown in Fig. As shown in Figure 3, an opening section 240 is formed on the insulating housing 200 at a location corresponding to the positioning point of the voltage sensing device 800, through which the voltage sensing device 800 is exposed. This allows the voltage sensing device 800 to be fastened in this opening section 240 to the positive busbar 110 using a screw and a corresponding rivet nut, thus facilitating the installation of the voltage sensing device 800.

[0037] The input assembly 10 can further comprise a wiring device 900 arranged on the insulating housing 200 and the protective hood 600, as shown in Fig. Figure 3 shows the wiring device 900, which comprises a ring-shaped structure for collecting cables and a curved structure for guiding cables. The cables in question are those contained within the functional elements of the input assembly 10. These include a cable from the current sensor 300 for transmitting the current signals it detects, a cable from the stack short-circuit protection device 400 for receiving collision signals, and a cable from the cover-opening locking device 700 for connecting to the PCB board, etc. The wiring device 900 facilitates cable organization and allows an operator to service various components of the input assembly 10.

[0038] The Fig. Figure 3 shows that an annular structure 210 for collecting cables and a curved structure 220 for guiding cables are provided on the circumference of the insulating housing 200. The curved structure 220 is designed as several L-shaped curved structures extending from the insulating housing 200, with adjacent L-shaped curved structures bent in opposite directions to achieve the guidance and securing of cables. Furthermore, the Fig. It can be seen from Figure 3 that several similar curved structures 640 are formed on the circumference of the protective hood 600, for example on its upper surface. It should be noted that the arrangement position and the design of the wiring device 900 can be adapted according to the number and arrangement of the cables and are not limited to those shown in Figure 3. Fig. 1 and Fig. The 3 forms shown are limited.

[0039] The insulating housing 200 can comprise several mounting sections 230 configured to be detachably attached to the housing of the power transmission unit, as shown in Fig. 3 and Fig. Figure 4 shows that each mounting section 230 includes an opening through which a screw can be passed to attach the insulating housing 200 to the housing of the power transmission unit. Using the multiple mounting sections 230 of the insulating housing 200 and the two second mounting structures 630 of the protective cover 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 design of the mounting sections 230 of the insulating housing 200 can be adapted according to the design of the housing of the power transmission unit and are not limited to those shown in Figure 4. Fig. 1, Fig. 2, Fig. 3 to Fig. The 4 forms shown are limited.

[0040] In the above content, the input assembly 10 for a power transmission unit according to the present utility model was described in more detail in connection with the respective drawings, wherein the input assembly 10 has a compact structure. In particular, the input assembly 10 has, with regard to the in Fig. The XYZ coordinate axes shown in Figure 1 have a length of approximately 200 mm, a width of approximately 100 mm, and a height of approximately 120 mm. The input assembly 10 fulfills the multiple functions described above with its compact structure and offers advantages such as space saving, ease of assembly, and maintenance.

[0041] It should be noted that in Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig.Figure 5 shows only one embodiment of the input assembly for a current transmission unit according to the present utility model. The arrangement of the individual components of the input assembly can, however, be modified as appropriate. As described above, the current sensor 300 is arranged in the figures, for example, such that the negative busbar 120 passes through its coil opening 320. In an alternative embodiment, however, it is possible for the current sensor to be arranged such that the positive busbar 110 passes through its coil opening 320. In this alternative embodiment, it is also necessary to adjust the arrangement positions of other functional elements of the input assembly 10 accordingly, based on the adjustment of the arrangement position of the current sensor 300.Such appropriate adjustment of the arrangement positions of the various functional elements of the input assembly 10 shall be regarded as falling within the scope of the present utility model.

[0042] The above content describes in detail the possible, but not limiting, embodiments of the input assembly for a power transmission unit according to the present utility model in conjunction with the accompanying drawings. It is obvious to a person skilled in the art that modifications and additions to the technology and structure, as well as recombinations of features in the respective embodiments, are to be considered as falling within the scope of the present utility model, provided they do not deviate from the scope and nature of the present disclosure as further explained below in the claims. Consequently, such modifications and additions that are conceivable under the teachings of the present utility model are to be considered part of the present disclosure.The scope of the present disclosure is defined by the attached claims and includes equivalent techniques known at the filing date of the present disclosure, as well as equivalent techniques not yet foreseeable.

Claims

[1] Input assembly (10) for a power transmission unit, wherein the input assembly (10) comprises a group of busbars (100) consisting of a positive busbar (110) and a negative busbar (120), wherein the positive busbar (110) and the negative busbar (120) each comprise an input end electrically connected to a stack of fuel cells to receive power from the stack, an output end electrically connected to the power transmission unit to transfer the power to the power transmission unit, and a main body section located between a corresponding input end and a corresponding output end, characterized by, that the input assembly (10) comprises an insulating housing (200) that surrounds the respective main body sections of the positive busbar (110) and the negative busbar (120) and at least partially fills 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 group of busbars (100). [2] Input assembly (10) according to claim 1, characterized by, that the functional elements of the input assembly include a current sensor (300) which is attached to the insulating housing (200) and is used to measure an output current of the stack, wherein the current sensor (300) comprises a sensor body (310) on which a coil opening (320) is formed, wherein a coil for detecting the current inside the sensor body (310) is arranged around the coil opening (320), and wherein the coil opening (320) is provided near the stack and allows a current from the positive busbar (110) and the negative busbar (120) to pass through the coil opening (320). [3] Input assembly (10) according to claim 2, characterized by, that in the main body section of a corresponding busbar of the group of busbars (100) passing through the coil opening (320), a step section (124) is provided near the inlet end of this corresponding busbar, wherein the step section (124) is configured to project in a direction away from the stack, and wherein the coil opening (320) is provided such that the step section (124) passes through the coil opening (320). [4] Input assembly (10) according to one of claims 1 to 3, characterized by, that the positive busbar (110) comprises a first extension section (114) of the positive busbar extending from its main body section, and the negative busbar (120) comprises a first extension section (125) of the negative busbar extending from its main body section; and that the functional elements of the input assembly (10) include a stack short-circuit protection device (400), wherein the stack short-circuit protection device (400) is mounted on the insulating housing (200) via the first extension section (114) of the positive busbar and the first extension section (125) of the negative busbar and is electrically connected between the positive busbar (110) and the negative busbar (120). [5] Input assembly (10) according to one of claims 1 to 3, characterized by, that the positive busbar (110) comprises a second extension section (115) of the positive busbar extending from its main body section and a third extension section (116) of the positive busbar extending from its input end, and the negative busbar (120) comprises a second extension section (126) of the negative busbar extending from its main body section;and that the functional elements of the input assembly (10) include an electromagnetic shielding device (500), wherein the electromagnetic shielding device (500) comprises an X-capacitor (510) electrically connected between the second extension section (115) of the positive busbar and the negative busbar (120), a first group of Y-capacitors (520) electrically connected between the third extension section (116) of the positive busbar and earth, and a second group of Y-capacitors (530) electrically connected between the second extension section (126) of the negative busbar and earth. [6] Input assembly (10) according to one of claims 1 to 3, characterized by, that a first input end opening (111a) is formed at the input end of the positive busbar (110) and a second input end opening (121a) is formed at the input end of the negative busbar (120); and that the functional elements of the input assembly (10) include a protective cover (600) which is attached to the insulating housing (200), wherein the protective cover (600) is arranged on one side of the respective main body sections of the positive busbar (110) and the negative busbar (120) and is open in an upward direction towards the respective input ends of the positive busbar (110) and the negative busbar (120), and wherein a group of openings (610) is formed on the bottom of the protective cover (600), each of which is aligned with the first input end opening (111a) and the second input end opening (121a). [7] Input assembly (10) according to claim 6, characterized by, that the functional elements of the input assembly (10) include a cover-opening locking device (700), wherein the cover-opening locking device (700) comprises a female end (710) arranged on the protective hood (600) and a male end arranged on a housing cover of the power transmission unit, and wherein the cover-opening locking device (700) is configured to disconnect the electrical connection between the stack and the group of busbars (100) as soon as the housing cover is opened. [8] Input assembly (10) according to one of claims 1 to 3, characterized by , that the functional elements of the input assembly (10) include a voltage sensing device (800) which is arranged on the positive busbar (110) and near the stack and is configured to detect the output voltage of the stack. [9] Input assembly (10) according to claim 6, characterized by , that the functional elements of the input assembly (10) include a wiring device (900) which is arranged on the insulating housing (200) and the protective hood (600), wherein the wiring device (900) comprises a ring-shaped structure for collecting cables contained in the functional elements and a curved structure for guiding the cables. [10] Input assembly (10) according to one of claims 1 to 3, characterized by , that the insulating housing (200) comprises several mounting sections (230) configured to be detachably attached to the housing of the power transmission unit.

Images