BUSBAR ASSEMBLY

Abstract

A busbar assembly includes a first busbar having a tapered portion with a reduced cross-sectional area in a first direction between its end portions, a second busbar spaced from the first busbar, an arc blocking portion disposed to at least surround the tapered portion, a magnetic core disposed on the outside of the arc blocking portion, and a housing accommodating corresponding portions of the first busbar and the second busbar, the arc blocking portion, and the magnetic core.

Description

BACKGROUND OF THE PRESENT DISCLOSURE Field of the present disclosure

[0001] The present disclosure relates to a busbar assembly having an inverter busbar structure incorporating an electromagnetic wave reduction core and a fuse. Description of the state of the art

[0002] With increasing environmental awareness, the number of eco-friendly vehicles equipped with electric motors as a power source is steadily increasing. Eco-friendly vehicles are also referred to as electrified vehicles, and typical examples include electric vehicles (EVs) and hybrid electric vehicles (HEVs). Electrified vehicles can be powered by the motive power of a high-performance motor, with a high-voltage battery and an inverter provided to power the motor.

[0003] An inverter in an electrified vehicle converts the direct current (DC) supplied by a high-voltage battery into alternating current (AC) and feeds the AC power to a motor. Because the high-voltage battery and the inverter are physically separated, the battery and inverter can be electrically connected via a connecting device such as a busbar.

[0004] In this case, depending on the structure of the current flow path, noise may be introduced into the inverter, and the introduced noise may be distorted or amplified by switching operations and the like in the inverter. This noise may affect the electromagnetic performance of vehicles. With the increasing popularity of electrified vehicles and the tightening of electromagnetic wave regulations in recent years, there is a growing need for configurations to reduce electromagnetic waves in vehicles.

[0005] On the other hand, high-voltage fuses can be installed in the high-voltage battery and distribution blocks of electrified vehicles to interrupt the flow of current in certain situations. High-voltage fuses can prevent vehicle damage from fire or similar incidents by physically interrupting the current-carrying busbar when excessive current is suddenly generated due to a vehicle malfunction or accident. As high-voltage batteries with even higher voltages have been deployed in recent years to improve the performance of electrified vehicles, there is a growing need to install fuses in the inverter as well, so that blowouts can be prevented before the fuse in the high-voltage battery is triggered, even when excessive current is applied to the inverter and motor system.

[0006] The information contained in this Background of the present disclosure is provided merely to facilitate understanding of the general background of the present disclosure and should not be construed as an acknowledgment or any form of suggestion that this information constitutes prior art already known to a person skilled in the art. SHORT SUMMARY

[0007] Various aspects of the present disclosure aim to provide a bus bar assembly that enables installation of an electromagnetic wave reduction device and a fuse in an inverter by eliminating a spatial limitation of a bus bar with an integrated structure of the electromagnetic wave reduction device and the fuse.

[0008] The object of the present disclosure is not limited to the subject matter described above, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

[0009] According to an exemplary embodiment of the present disclosure for achieving the above-described object, a busbar assembly includes a first busbar corresponding to a first pole, extending in a first direction, and having a narrowing portion with a reduced cross-sectional area in the first direction between end portions of the first busbar; a second busbar corresponding to a second pole, extending in the first direction, and spaced from the first busbar in the second direction intersecting the first direction; an arc-blocking portion disposed to surround a portion of the first busbar and the second busbar to surround at least the narrowing portion; a magnetic core disposed outside the arc-blocking portion to surround respective predetermined portions of the first busbar and the second busbar;and a housing that accommodates the respective sections of the first busbar and the second busbar, the arc blocking section, and the magnetic core.

[0010] For example, a first space in which the respective portions of the first busbar and the second busbar and the arc-barring portion are arranged, and a second space provided outside the first space for the magnetic core to be arranged therein and separately from the first space, may be provided inside the housing.

[0011] For example, the housing includes open end portions spaced apart from each other in the first direction, and a partition wall having a smaller circumference than the housing may be provided within the housing, wherein the first space may be formed within the partition wall, while the second space may be formed between the partition wall and the housing.

[0012] For example, the housing may include a container having an interior integrally formed by one end portion that is closed and one side that extends from the closed one end portion in the first direction, and a lid that is coupled to the container to close the other end portion that is spaced from the closed one end portion in the first direction, wherein a plurality of through holes that allow the passage of the first bus bar and the second bus bar in the first direction may be provided at the closed one end portion thereof and the lid of the container.

[0013] For example, the respective cross-sectional areas of the plurality of through holes may correspond to the cross-sectional areas of the first busbar or the second busbar.

[0014] For example, the constriction portion may have perforations at a plurality of points between the end portions of the first busbar in a third direction crossing the first direction and the second direction.

[0015] For example, the constriction may have a perforation in the third direction that is repeated in the second direction.

[0016] For example, the constriction portion may include a perforation that is repeated at positions spaced apart in the first direction on the first busbar.

[0017] For example, the constriction portion may have a smaller thickness in the third direction compared to the end portions of the first busbar and may include a step difference from the end portions of the first busbar.

[0018] The first busbar and the second busbar can, for example, be arranged between the battery present in the vehicle and the inverter that converts the direct current of the battery into alternating current.

[0019] According to the various embodiments of the present disclosure as described above, an electromagnetic wave reduction core and a fuse can be mounted by a bus bar structure in which the electromagnetic wave reduction core and the fuse are integrated.

[0020] In addition, by reducing the total volume of the electromagnetic wave reduction core and fuse compared to a single installation, it is possible to save space, create a structure that can be easily adapted to the inverter, and improve space utilization.

[0021] In addition, costs can be reduced by integrating individual components.

[0022] The methods and apparatus of the present disclosure have additional features and advantages that will be apparent from the accompanying drawings included herein and the following detailed description, which together serve to explain certain principles of the present disclosure, or which are set forth in more detail in those drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view exemplarily illustrating a disassembled bus bar assembly according to an exemplary embodiment of the present disclosure. Fig. 2 is a view illustrating an assembled bus bar assembly according to an exemplary embodiment of the present disclosure. Fig. 3 is a view showing an example of a cross section of the busbar assembly along the line AA' in Fig. 2 illustrated. Fig. 4 and Fig. 5 are views illustrating exemplary disassembled bus bar assemblies according to other embodiments of the present disclosure.

[0023] It should be understood that the accompanying drawings are not necessarily to scale and present a somewhat simplified representation of various features illustrating the basic principles of the present disclosure. The specific design features of the present disclosure as contained herein, including, for example, specific dimensions, orientations, positions, and shapes, will be determined in part by the particular intended application and environment of use.

[0024] In the figures, reference numerals refer to the same or equivalent parts of the present disclosure in the several views of the drawing. DETAILED DESCRIPTION

[0025] Reference will now be made in detail to various embodiments of the present disclosure(s), examples of which are illustrated in the accompanying drawings and described below. Although the present disclosure(s) are described in connection with exemplary embodiments of the present disclosure, this description is not intended to limit the present disclosure(s) to these exemplary embodiments of the present disclosure. On the contrary, the present disclosure(s) are intended to cover not only the exemplary embodiments of the present disclosure, but also various alternatives, modifications, equivalents, and other embodiments that may be included within the spirit and scope of the present disclosure as defined by the appended claims.

[0026] Specific structural or functional descriptions of the exemplary embodiments of the present disclosure contained herein or in the application are provided only to describe embodiments of the present disclosure, and the present disclosure may be embodied in various embodiments that should not be construed as limited to the exemplary embodiments described herein or in the application.

[0027] Since the exemplary embodiments of the present disclosure are subject to various modifications and may take many forms, specific embodiments are illustrated in the drawings and described in detail herein or in the application. However, this is not intended to limit embodiments according to the concept of the present disclosure to particular forms of disclosure, but should be understood to include all modifications, equivalents, and substitutes within the scope of the ideas and technology of the present disclosure.

[0028] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by persons of ordinary skill in the art to which this disclosure relates. Terms as defined in commonly used dictionaries should be interpreted to have a meaning consistent with the meaning in the context of the relevant art and are not to be interpreted in an ideal or overly formal sense unless expressly defined herein.

[0029] The exemplary embodiments contained herein will be described in detail with reference to the accompanying drawings. However, the same or similar components are designated by the same reference numerals regardless of the drawing numbers, and repetitive descriptions of these components will be omitted.

[0030] The suffixes "module" and "unit" for the components used in the following description are provided only to facilitate the writing of the specification or are used interchangeably without necessarily denoting any meaning or role of their own.

[0031] If it is determined that the specific description of related and previously known technology might obscure the essence of the exemplary embodiments contained herein, the specific description will be omitted. Furthermore, it should be understood that the accompanying drawings are provided only to facilitate understanding of the exemplary embodiments contained herein and are not intended to limit the technical ideas contained herein, which are not limited to the accompanying drawings and include all modifications, equivalents, or substitutions within the spirit and technical scope of the present disclosure.

[0032] The terms, including ordinal numbers such as first, second, and similar, may be used to describe different components, but the components are not to be limited by the terms. The terms may only be used to distinguish the individual components.

[0033] When a component is described as "connected" or "coupled" to another component, the component may be directly connected or coupled to the other component, but other components may also be interposed. On the other hand, when a component is described as "directly connected" or "directly coupled" to another component, no other component is interposed.

[0034] Expressions in the singular include plural expressions unless the context expressly indicates otherwise.

[0035] In this specification, terms such as "comprising" or "having" are intended to indicate the presence of the implemented features, numbers, steps, manipulations, components, parts, or combinations thereof described in the specification and are not to be understood as excluding the presence or additional capabilities of one or more other features, numbers, steps, manipulations, components, parts, or combinations thereof.

[0036] According to an exemplary embodiment of the present disclosure, a busbar assembly is implemented by integrating an electromagnetic wave reduction core and a fuse into the busbar, thereby reducing overall volume and cost, improving space utilization, and facilitating application to various devices.

[0037] A busbar assembly according to an exemplary embodiment of the present disclosure is described with reference to Fig. 1, Fig. 2 and Fig. 3 described in detail.

[0038] Fig. 1 is a view illustrating, by way of example, a disassembled busbar assembly according to an exemplary embodiment of the present disclosure, Fig. 2 is a view illustrating an assembled busbar assembly according to an exemplary embodiment of the present disclosure, Fig. 3 is a view showing an example of a cross section of the busbar assembly along the line AA' in Fig. 2 illustrated, and Fig. 4 and Fig. 5 are views illustrating exemplary disassembled busbar assemblies according to other embodiments of the present disclosure.

[0039] Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5 show that a busbar assembly according to an exemplary embodiment of the present disclosure may include a first busbar 100, a second busbar 200, an arc blocking portion 300, a magnetic core 400, and a housing 500. Fig. However, Figure 1 primarily shows components related to the description of an exemplary embodiment of the present disclosure, and an actual bus bar assembly may include more or fewer components than shown. Each component is described in detail below.

[0040] First, the first busbar 100 corresponds to a first pole, extends in a first direction, and may include a narrowing portion 110 with a reduced cross-sectional area in the first direction between the end portions. The second busbar 200 corresponds to a second pole, extends in the first direction, and is spaced from the first busbar 100 in a second direction that crosses the first direction.

[0041] The first and second poles may be anodes and cathodes, respectively, and correspond to the end sections of a high-voltage battery in a vehicle. Furthermore, the first busbar 100 and the second busbar 200 may be arranged parallel to each other.

[0042] The first busbar 100 includes a constriction portion 110 between the end portions in the first direction, and the constriction portion 110 includes a reduced cross-sectional area in the first direction compared to other portions of the first busbar 100.

[0043] The constriction portion 110 may have a reduced cross-sectional area in the first direction due to the perforations formed at a plurality of positions between the end portions of the first busbar 100 in the third direction thereof. Furthermore, the constriction portion 110 may include the perforation formed in the third direction repeated in the second direction, and the perforation may also be repeated at positions spaced apart from each other in the first direction on the first busbar 100.

[0044] As in Fig. For example, as shown in Figure 1, the constriction portion 110 may include the perforation 120 formed in the third direction and repeated in the second direction, and the repeated perforations 120 may be arranged in two rows spaced apart from each other in the first direction. Furthermore, the perforation 120 may be formed singly or in multiple rows.

[0045] The number of rows of the repeated perforations 120 is not limited to the two rows, so that the number of rows of the repeated perforations 120 includes a single row and equal to or more than the two rows.

[0046] An exemplary embodiment of the present disclosure may further include at least one groove 130 on a lateral side of the constriction portion 110 in the second direction. When there are multiple grooves 130, the majority of the grooves 130 are formed in the first direction.

[0047] Furthermore, in an exemplary embodiment of the present disclosure, the constriction portion 110 may be formed by the perforation 120, the groove 130, or a combination of the perforation 120 and the groove 130.

[0048] In contrast, Fig. 4, which shows another exemplary embodiment of the present disclosure that the constriction portion 110 can be implemented in a slot 140 in which the perforation made in the third direction is repeated in the second direction, but the perforations in the first direction are elongated instead of being arranged in two rows as in Fig. 1. Furthermore, the slots 140 may be formed singly or in a plurality. Furthermore, the extension direction of the slot 140 is not limited to the first direction, but may also be formed in the second direction.

[0049] The number of rows of the repeating slots 140 is not limited to the two rows, so that the number of rows of the repeating slots 140 may include a single row and equal to or more than the two rows.

[0050] An exemplary embodiment of the present disclosure may further include at least one groove 130 in the second direction. If there are multiple grooves 130, the plurality of grooves 130 are formed in the first direction.

[0051] Furthermore, in an exemplary embodiment of the present disclosure, the constriction portion 110 may be formed by the slot 140, the groove 130, or a combination of the slot 140 and the groove 130.

[0052] On the other hand, the constriction section 110, as shown in Fig. 5, be implemented in a step-like difference form in which the thickness in the third direction is reduced compared to the end portions of the first busbar 100 and a step-like difference is provided from the end portions of the first busbar 100, instead of making perforations at a plurality of points between the end portions of the first busbar 100 in the third direction.

[0053] The Fig. 1 and Fig. 4 and Fig. The shapes of the constriction portions 110 illustrated in FIG. 5 are all intended to form a portion in which the cross-sectional area in the first direction is reduced between the end portions of the first busbar 100. Moreover, the cross section can be adopted as the structure of the constriction portion 110 as long as the shape connects the end portions of the first busbar 100 even if the cross-sectional area in the first direction is reduced.

[0054] Additionally, in an exemplary embodiment of the present disclosure, the constriction portion 110 may be formed by the perforation 120, the groove 130, the slot 140, the step difference, or a combination thereof.

[0055] On the other hand, when current flows through the first busbar 100, the current density increases due to the reduced cross-sectional area of ​​the constriction portion 110 in the direction of current movement. When a current of a certain value or more flows, heat is generated and the temperature rises. As the temperature continues to rise and reaches the melting point of the first busbar 100 or higher, the constriction portion 110 melts before the other portions. When the constriction portion 110 melts, the end portions of the first busbar 100 are separated, so that no more current flows through the first busbar 100, thus preventing further damage due to the passage of a large current.

[0056] Moreover, the above description focuses on the first bus bar 100, but a bus bar assembly according to an exemplary embodiment of the present disclosure can be realized by applying the constriction portion 110 to the second bus bar 200 or by applying the constriction portion 110 to both the first bus bar 100 and the second bus bar 200.

[0057] On the other hand, the arc blocking portion 300 is arranged to surround a part of the first bus bar 100 and the second bus bar 200 to surround at least the constriction portion 110.

[0058] When the end portions of the first busbar 100 are separated by the melting of the constriction portion 110, an arc may be generated near the constriction portion 110, which may cause damage to adjacent equipment. Accordingly, the arc blocking portion 300 surrounds the vicinity of the constriction portion 110 and blocks the arc when the arc is generated in the constriction portion 110, thereby preventing damage to the surrounding area.

[0059] For this purpose, the arc-blocking portion 300 may be provided with an arc quencher, such as silicon dioxide, and with a packaging material for accommodating the arc quencher. For example, when an arc is generated in the narrowing portion 110, the arc quencher is released from the packaging material, and the released arc quencher absorbs the heat during melting, thereby preventing burn-through to the surrounding area.

[0060] The magnetic core 400 is arranged on the outside of the arc-blocking section 300 and can be made of a magnetic material such as ferrite. The magnetic core 400 simultaneously surrounds a portion of the first busbar 100 and a portion of the second busbar 200 on the outside of the arc-blocking section 300 and can, for example, be circular.

[0061] The magnetic core 400 configured in the given manner can reduce electromagnetic waves by absorbing electromagnetic noise components that form between the first bus bar 100 and the second bus bar 200 at a distance from each other.

[0062] As described above, the arc blocking section 300 surrounds the vicinity of the constriction part 110 and the magnetic core 400 surrounds the bus bars 100, 200 on the outside of the arc blocking section 300, so that an integrated structure of a fuse and an electromagnetic wave reduction device can be provided, ensuring a reduced overall volume and full performance of the respective functions.

[0063] On the other hand, the housing 500 accommodates the respective parts of the first busbar 100 and the second busbar 200, the arc-blocking section 300, and the magnetic core 400, and may be made of, for example, a plastic material. The housing 500 houses and protects components such as the arc-blocking section 300, the magnetic core 400, and the like, and as shown in Fig.2, the arc blocking section 300 and the magnetic core 400 are locked against external influences by the housing 500 in the fully assembled state.

[0064] Inside the housing 500, a first space 501 in which parts of the first busbar 100 and the second busbar 200 and the arc blocking section 300 are arranged, and a second space 502 located outside the first space 501 and in which the magnetic core 400 is arranged and separated from the first space 501 may be provided.

[0065] The housing 500 may have open end portions spaced apart from each other in the first direction, and a partition wall having a smaller circumference than the housing 500 may be provided inside the housing 500. In the present case, the first space 501 may be formed within the partition wall 600, and the second space may be formed between the partition wall 600 and the housing 500, wherein the first space 501 and the second space 502 are separated from each other by the partition wall 600.

[0066] On the other hand, the housing 500 may include a container 510 enclosing an interior space integrally formed by one end portion being closed and one side extending from the one end portion in the first direction, and a cover 520 coupled to the container 510 to close the other end portion spaced from the closed one end portion in the first direction.

[0067] In the present case, a plurality of through-holes 511, 512, which allow the passage of the first busbar 100 and the second busbar 200 in the first direction, may be provided at the one closed end portion and the lid 520 of the container 510. The respective cross-sectional areas of the plurality of through-holes 511, 521 may correspond to the cross-sectional areas of the first busbar 100 or the second busbar 200.

[0068] As a result, the busbar assembly can be constructed such that corresponding portions of the first busbar 100 and the second busbar 200, in particular the constriction portion 110, can be arranged in the housing 500, while the arc-blocking portion 300 and the magnetic core 400 are blocked from external influence.

[0069] On the other hand, the bus bar assembly according to an exemplary embodiment of the present disclosure may be used in a vehicle and arranged between a battery provided in the vehicle and an inverter that converts alternating current of the battery into direct current.

[0070] The first busbar 100 and the second busbar 200 can be arranged between the battery and the inverter and serve as a DC input terminal for supplying the DC power of the battery to the inverter.

[0071] In this case, the constriction portion 110 and the arc-barring portion 300 formed in the first bus bar 100 can protect the inverter from a large current, and the magnetic core 400 surrounding the first bus bar 100 and the second bus bar 200 can improve the electromagnetic wave performance of the inverter by absorbing electromagnetic waves.

[0072] According to various embodiments of the present disclosure, as described above, the electromagnetic wave reduction core and the fuse in the inverter may be provided by a bus bar structure in which the electromagnetic wave reduction core and the fuse are integrated.

[0073] By reducing the overall volume of the electromagnetic wave reduction core and fuse compared to individual manufacturing, it is also possible to save space, create a structure that can be easily integrated with the inverter, and improve space utilization.

[0074] In addition, costs can be reduced by integrating individual components.

[0075] For ease of explanation and for precise definition in the appended claims, the terms "top," "bottom," "inside," "outside," "high," "down," "upward," "downward," "front," "rear," "inside," "outside," "inward," "outward," "interior," "exterior," "internal," "external," "forward," and "backward" are used to describe features of the exemplary embodiments with reference to the positions of those features illustrated in the figures. The term "connect" or its derivatives refer to both direct and indirect connection.

[0076] The term "and / or" can include a combination of multiple related listed items or any one of a plurality of related listed items. For example, "A and / or B" includes all three cases such as "A," "B," and "A and B."

[0077] In this description, unless otherwise stated, the singular includes the plural unless the context clearly indicates otherwise.

[0078] In exemplary embodiments of the present disclosure, "at least one of A and B" may refer to "at least one of A or B" or to "at least one of combinations of at least one of A and B." Furthermore, "one or more of A and B" may refer to "one or more of A or B" or "one or more combinations of one or more of A and B."

[0079] In the exemplary embodiment of the present disclosure, it is to be understood that a term such as "including" or "having" is intended to imply that the features, numbers, steps, acts, elements, parts, or combinations thereof described in the specification are present, and does not exclude the possibility that one or more other features, numbers, steps, acts, elements, parts, or combinations thereof are added or present.

[0080] The foregoing descriptions of specific exemplary embodiments of the present disclosure have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present disclosure to the precise forms disclosed, and, of course, many changes and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and their practical application to enable others skilled in the art to make and use various exemplary embodiments of the present disclosure, as well as various alternatives and modifications thereof. It is intended that the scope of the present disclosure be defined by the appended claims and their equivalents.

Claims

[1] Busbar assembly comprising: a first busbar corresponding to a first pole and extending in a first direction; a second bus bar corresponding to a second pole, extending in the first direction, and spaced from the first bus bar in a second direction intersecting the first direction, wherein a narrowing portion having a reduced cross-sectional area is formed on at least one of the first bus bar and the second bus bar in the first direction between a first end portion and a second end portion of the at least one bus bar; an arc blocking portion arranged to surround a portion of the first busbar and a portion of the second busbar to surround the constriction portion; a magnetic core disposed outside the arc-blocking section to surround the first busbar and the second busbar regions; and a housing that accommodates the parts of the first busbar and the second busbar, the arc blocking section and the magnetic core in the housing. [2] The busbar assembly of claim 1, wherein the housing comprises: a first space in which the first busbar, the second busbar, and the arc-blocking section are arranged; and a second space provided on the outside of the first space so that the magnetic core can be arranged therein and separated from the first space. [3] Busbar assembly according to claim 2, wherein the housing has open end portions spaced apart from each other in the first direction, and a partition wall having a smaller circumference than the housing is provided inside the housing, and wherein the first space is formed within the partition wall and the second space is formed between the partition wall and the housing. [4] The busbar assembly of claim 1, wherein the housing comprises: a container having an interior space formed by a first end portion of the housing which is closed and a side extending from the closed end portion in the first direction; and a cover connected to the container to close a second end portion of the housing spaced in the first direction from the closed end portion, wherein a plurality of through holes allowing the passage of the first bus bar and the second bus bar in the first direction are provided at the closed one end portion and the cover of the container. [5] The bus bar assembly according to claim 4, wherein first end portions of the first bus bar and the second bus bar are positioned in a first side of the container by passing through the plurality of through holes, and second end portions of the first bus bar and the second bus bar are positioned in a second side of the container without passing through the plurality of through holes. [6] The busbar assembly according to claim 4, wherein the respective cross-sectional areas of the plurality of through-holes correspond to the cross-sectional areas of the first busbar and the second busbar. [7] The busbar assembly of claim 1, wherein the constriction portion comprises at least one perforation formed between the first and second end portions of the at least one busbar in a third direction crossing the first direction and the second direction. [8] The busbar assembly of claim 7, wherein the at least one perforation is a plurality of perforations, and the plurality of perforations are formed between the first and second end portions of the at least one busbar. [9] The busbar assembly of claim 8, wherein the plurality of perforations are formed in the third direction and repeat in the second direction. [10] The busbar assembly of claim 9, wherein the plurality of perforations are formed at repeated positions spaced apart from each other in the first direction on the at least one busbar. [11] The busbar assembly of claim 8, wherein the plurality of perforations are slots extending at positions spaced apart from one another in the first direction or the second direction on the at least one busbar. [12] The busbar assembly of claim 7, wherein the at least one perforation is at least one slot formed in the first direction or the second direction on the at least one busbar. [13] The busbar assembly of claim 1, wherein the narrowing portion has a reduced thickness compared to the first and second end portions of the at least one busbar in a third direction crossing the first direction and the second direction. [14] The busbar assembly of claim 13, wherein the constriction portion further comprises a step difference from the first and second end portions of the at least one busbar. [15] The busbar assembly of claim 13, wherein the narrowing portion further comprises at least one perforation formed between the first and second end portions of the at least one busbar in the third direction crossing the first direction and the second direction. [16] The busbar assembly of claim 15, wherein the at least one perforation is at least one slot extending in the first direction or the second direction on the at least one busbar. [17] The busbar assembly of claim 13, wherein the constriction portion includes at least one groove formed on one side of the constriction portion. [18] The busbar assembly of claim 1, wherein the constriction portion includes at least one groove formed on one side of the constriction portion. [19] The bus bar assembly of claim 1, wherein the first bus bar and the second bus bar are arranged between a battery provided in a vehicle and an inverter that converts direct current of the battery into alternating current.

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