KR20200116881A - Flexible bus bar - Google Patents

Abstract

The present invention relates to a flexible bus bar, which is convenient to be used in a complex and narrow space where cable connection is not suitable, easily secures sufficient allowable currents, and furthermore, secures fire resistance. The flexible bus bar includes a conductor portion, a terminal portion, and a fireproof tape.

Description

Flexible bus bar {FLEXIBLE BUS BAR}

The present invention relates to a flexible busbar. In more detail, the present invention relates to a flexible bus bar that is convenient to use in a complex and narrow space where cable connection is not suitable, it is easy to secure a sufficient allowable current, and further, has fire resistance.

The structure of the electric vehicle, etc., is complex and narrow. Since electric vehicles use electric energy, cables used in electric vehicles require greater energization capability than cables used in general vehicles.

There is a method of increasing the diameter of the cable in order to secure sufficient energization capacity, but when the thickness of the cable is increased, the required flexibility or arrangement space within a narrow and complex space in the electric vehicle electric space (e.g., battery pack) Difficult to secure.

7 shows a conventional circular cable for connecting an electronic device inside a vehicle.

As shown in Fig. 7(a), when the length of the cable is secured to some extent, it is not difficult to form the bent part (C) by deforming the cable, but when the length of the cable is short as shown in Fig. 7(b) It is not easy to form the bent portion (C).

And, as shown in Fig. 7, a cable composed of a plurality of wires cannot be connected to an electronic device constituting an electric vehicle, so a method such as crimping with a connection terminal 2 serving as a separate fastening part. And the connection terminals 2 are fastened to the terminal portions of both electronic devices, so that both electronic devices are electrically connected.

Even if the problem of the thickness of the cable is not discussed, in the case of using a general cable, connection terminals for unit side connection must be provided at both ends, and separate connection terminals require a crimp jig for cable connection, and development of connection terminals is required. The cost may increase because a separate manufacturing facility such as a press mold is required.

In addition, since the length between components requiring electrical connection in the electric vehicle's electrical space is smaller than the length suitable for mass production of a conventional cable, designing and manufacturing a separate cable may induce an increase in cost.

Furthermore, such cables are also required to secure a certain fire resistance so that conductors, etc., are not directly exposed to the flame even when exposed to flames during a fire.

It is an object of the present invention to provide a flexible bus bar that is convenient to use in a complex and narrow space where cable connection is not suitable, it is easy to secure a sufficient allowable current, and further has fire resistance.

In order to solve the above problems, the present invention provides a conductor portion formed by stacking a plurality of plate-shaped conductors, a terminal portion formed by welding each of both ends in the longitudinal direction of the conductor portion, and at least two layers of overlap in a predetermined section of the conductor portion. It is possible to provide a flexible bus bar, characterized in that it includes a fire-resistant tape wound on the conductor to have.

Here, the fireproof tape is wound on the conductor portion so as to have two or three overlapping layers in a predetermined section of the conductor portion. On the other hand, the fireproof tape may be configured by bonding a mica layer on top of the glass yarn fabric layer by an adhesive.

In addition, a tube member surrounding the fireproof tape may be further provided.

On the other hand, in order to solve the above problem, the present invention has a conductor portion formed by stacking a plurality of plate-shaped conductors, a terminal portion formed by welding each of both ends in the length direction of the conductor portion, and a width of a predetermined size, and the conductor portion It is achieved by a flexible busbar, characterized in that it comprises a fireproof tape wound on the conductor portion so as to overlap at least 1/2 of the width in a predetermined section.

Here, the fireproof tape is wound on the conductor portion so that 1/2 or more and 2/3 or less of the width overlap in a predetermined section of the conductor portion.

On the other hand, in order to solve the above problem, the present invention provides a conductor portion formed by stacking a plurality of plate-shaped conductors, a terminal portion formed by welding to both ends of the conductor portion in the longitudinal direction, and the length of the conductor portion in a predetermined section of the conductor portion. It is achieved by a flexible busbar, characterized in that it comprises a fireproof tape wound on the conductor portion so as to achieve an angle of 65 degrees to 80 degrees with respect to the direction.

Here, the fireproof tape may be wound on the conductor to form an angle of 65 to 75 degrees with respect to the length direction of the conductor.

On the other hand, in order to solve the above problem, the present invention has a conductor portion formed by stacking a plurality of plate-shaped conductors, a terminal portion formed by welding each of both ends in the length direction of the conductor portion, and a width of a predetermined size, and the conductor portion It includes a fireproof tape wound on the conductor so as to have at least two overlaps in a predetermined section, overlap at least 1/2 of the width, and form an angle of 65 degrees to 80 degrees with respect to the length direction of the conductor part. This is achieved by a flexible busbar.

According to the flexible busbar according to the present invention, it can be used to connect electronic devices in a complex and narrow space where cable connection is not suitable.

In addition, according to the flexible bus bar according to the present invention, if the welding portions at both ends of the flexible bus bar satisfy the allowable current, it is easy to secure the amount of current in an intermediate portion not joined by a method such as welding due to a current surface effect.

Further, according to the flexible busbar according to the present invention, a fireproof tape surrounding a predetermined area of the conductor may be provided, and the inner conductor may be protected from external flames in an emergency.

Further, according to the flexible bus bar according to the present invention, it is difficult to use a conventional cable due to a short connection distance, or when a cable of various capacities or standards is required, it can be implemented at a minimum cost.

1 is a perspective view of a flexible bus bar according to the present invention,
2 is a perspective view showing a state in which the fireproof tape is removed from FIG. 1;
3 is a cross-sectional view showing the configuration of a fireproof tape;
4 is a plan view of a flexible bus bar according to the present invention,
5 is a cross-sectional view taken along line'V-V' of FIG. 4 in an embodiment;
6 is a cross-sectional view taken along line'V-V' of FIG. 4 in another embodiment;
7 is a perspective view showing a cable used in a conventional electric vehicle.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art. The same reference numbers throughout the specification denote the same elements.

1 is a perspective view illustrating a flexible bus bar 100 according to the present invention, and FIG. 2 is a perspective view illustrating a state in which the fireproof tape 200 is removed from FIG. 1.

Referring to FIGS. 1 and 2, the flexible bus bar 100 according to the present invention is manufactured by stacking a plurality of plate-shaped conductors 10. The flexible busbar is generally composed of a single plate-shaped conductor. However, in the flexible busbar according to the present invention, a plurality of thin and long plate-shaped conductors 10 are stacked to form one flexible busbar. The number of plate-shaped conductors 10 may be increased or decreased.

On the other hand, when an alternating current is applied to a metal conductor, the surface current increases as the frequency increases according to the skin effect, and thus the maximum allowable current may also increase as the surface area of the metal conductor increases. Therefore, when configuring a flexible busbar using a plurality of plate-shaped conductors 10, rather than configuring a busbar with a single conductor, an effect of increasing the surface area according to the number of plate-shaped conductors can be obtained, so that the allowable conduction current increases. You can get the effect.

In addition, when a flexible busbar is formed by stacking a plurality of plate-shaped conductors, there is an advantage that busbars of various capacities or specifications can be manufactured by changing the thickness or width of each of the plate-shaped conductors to be stacked.

On the other hand, in the laminated plate-shaped conductor 10, it is described that both ends in the longitudinal direction are used as the first terminal portion 130 and the second terminal portion 150, respectively, and divided into a conductor portion 110 between the terminal portions 130 and 150 Can be.

The flexible bus bar 100 according to the present invention is composed of a plurality of plate-shaped conductors 10, but both ends serving as a connector are integrated by welding to form the terminal portions 130 and 150. Accordingly, one end of the laminated plate-shaped conductor 100 may be welded to form the first terminal portion 130 of the laminated plate-shaped conductor 100 constituting the flexible bus bar 100 according to the present invention.

In the flexible bus bar 100 according to the present invention, both ends of the plurality of plate-shaped conductors 10 are welded to each other to constitute the first terminal portion 130 and the second terminal portion 150. Accordingly, the region of the conductor portion 110 between the two terminal portions is covered without being bonded, and a certain amount of clearance may exist therein regardless of whether it is bent or not. This clearance can help to cool when heat is generated by the current flowing along the conductor. In particular, in the bent portion (bending portion, etc.), a gap between the plurality of plate-shaped conductors 10 can be further secured, so it is more effective in solving the heating problem.

As a result, in the flexible bus bar 100 according to the present invention, if the welded terminal portion satisfies the allowable current, the non-welded conductor portion has a clearance for increasing the surface area and cooling, so that the coated conductor compared to the bus bar composed of a single conductor. It can effectively solve the overheating problem in the sub area.

That is, since only both terminal portions 130 and 150 of the flexible bus bar 100 are welded, and the conductor portion 110 connecting both terminals is covered without being joined by welding, etc., through both terminal portions 130 and 150 When the supplied current flows less than the size of the allowable current of both terminal portions 130 and 150, both terminal portions 130 and 150 are connected, and the conductor portion 110 made of the same material has a gap therein. Since the effect of increasing the surface area can be obtained, the allowable current is larger than that of the terminal portion, so that the problem due to heat generation can be effectively reduced.

After welding to form the first terminal part 130 is performed, a fastening hole 130h may be formed to improve the fastening convenience of the first terminal part 130.

On the other hand, after forming the fastening hole 130h in the first terminal portion 130, the surface of the first terminal portion 130 or the perforated portion may be smoothly polished (硏磨).

Here, it should be understood that polishing includes all concepts such as chamfering, length cutting, etc. in addition to a series of processes that merely smooth the surface. Accordingly, the surface of the first terminal portion of FIG. 1 on which the polishing step is completed is smooth, and round processing of the corners is completed, thereby preventing injury to an operator and minimizing friction with surrounding parts.

On the other hand, the first terminal portion 130 and the second terminal portion 150 of the laminated plate-shaped conductor of the flexible busbar are welded, perforated, and polished to be used as connectors or connecting means, so they are not covered, but the first terminal portion 130 and the second terminal portion 150 2 It is preferable that the non-welded conductor portion 110 connecting the terminal portion 150 is insulated and coated to protect the inner conductor portion 110 from flames in case of fire. The flexible busbar may be used in a narrow space in a vehicle or the like, and it is necessary to protect the inner conductor from external flames in case of a fire. Therefore, it is preferable to be coated with a material having fire resistance. For this purpose, the flexible bus bar 100 according to the present invention may include a fireproof tape 200 to surround the conductor portion 110 or to surround a predetermined area of the conductor portion 110.

As shown in FIG. 1, the fireproof tape 200 is configured to surround the conductor portion 110 of the flexible bus bar 200, and configured to surround a predetermined area of the conductor portion 110, or It may be configured to cover the entire area of the conductor part 110.

The fire resistant tape 200 may be made of a material having fire resistance, for example, may be made of a so-called'mica tape'.

Mica is a material of mica and is a kind of silicate mineral and has strong fire resistance against fire.

3 is a cross-sectional view showing the configuration of a fireproof tape 200 made of mica tape.

3, the fireproof tape 200 is a mica layer 210 formed by agglomeration of mica powder, a reinforcing layer for reinforcing the strength of the mica layer 210, and a glass yarn fabric layer formed by a weave of glass fibers ( 220). Further, although not shown in the drawings, a metal hydroxide coating layer for imparting water resistance to the fireproof tape 200 and further improving insulation properties and strength may be further provided.

Looking at the outer shape of the fireproof tape 200, for example, the thickness may be approximately 0.15±0.03 millimeters (mm), and the width may be approximately 55±0.5 millimeters (mm). In addition, looking at various physical properties of the fireproof tape 200, the mass per unit area is approximately 260±25 g/m2, the flexibility is approximately 80 N/m or less, and the tensile strength is approximately 120 N/cm. It can be made more than one. Meanwhile, the insulation breakdown voltage (B.D.V) of the fireproof tape 200 may be approximately 2.5 KV or higher, and the mica weight constituting the mica layer 210 may be approximately 60% or higher. Further, when an external flame or the like acts, the heating loss may be configured to be approximately 8.0% or less.

Here, the mica powder constituting the mica layer 210 is not particularly limited, but may be a soft mica powder, a hard mica powder, or a mixture thereof, preferably agglomeration of the soft mica powder having a heat resistance temperature of 900 to 1,000°C Can be formed by Preferably, the mica layer 210 may have a mica weight density of 140 to 170 g/m 2, which means the weight of mica powder per unit area.

If the mica weight density is less than 140 g/㎡, the fire resistance is insufficient, and the fire resistance test of IEC 60331-21 (750℃, 90 minutes) can pass, but IEC 60331-1,2, BS with flame temperature of 830~950℃ Fire resistance tests such as 6387 and BS 8491 cannot be passed. On the other hand, when the mica weight density is more than 170 g/m2, the adhesion between the mica powders constituting the mica layer 210 is relatively lowered, and cracks and breakages may occur during the taping operation of the mica tape on the conductor.

In addition, the mica layer 210 and the glass yarn fabric layer 220 may be adhered by an adhesive. The adhesive is not particularly limited, and may be, for example, an adhesive including a silicone resin, and such an adhesive is benzyl alcohol, ethane, hexachloro, 7,9-di-tert-butyl- 1-oxaspiro(4,5)deca-6,9-diene-28-done(7,9-Di-tert-butyl-1-oxaspiro(4,5)deca-6,9-diene-28-done ) And the like may be added. In the fireproof tape 200, the adhesive amount (resin content) may be made of approximately 13 ± 3%.

The glass yarn fabric layer 220 functions as a reinforcing layer reinforcing the strength of the mica layer 210, and the glass yarn having a thickness of 80 to 120 micrometers (㎛) is 200 to 500 micrometers (㎛) horizontally , It may be formed by weaving with a vertical spacing of 100 to 300 micrometers (㎛).

The glass yarn fabric layer 220 has a glass yarn weight density of 20 to 26 g/m2, which means the weight of glass yarn per unit area, and the area occupied by the glass yarn fabric layer 220 in the total area of the mica layer 210 ( As a percentage of s), the glass yarn weaving density may be 35-50%.

Meanwhile, FIG. 4 is a plan view of the flexible bus bar 100 according to the present invention.

Referring to FIG. 4, the fireproof tape 200 is wound along a predetermined area of the conductor portion 110 of the flexible bus bar 100.

At this time, when the fireproof tape 200 is wound, the conductor part (?) according to the angle θ formed with the longitudinal direction of the conductor part 110, the overlapping state and/or the amount of overlapping of the fireproof tape 200 110), the degree of fire resistance varies.

For example, when looking at the overlapping state of the fireproof tape 200, when the fireproof tape 200 is wound without overlapping, when wrapping the conductor part 110 with one layer, the fireproof tape 200 The fire resistance by this can be very poor. Conversely, when the conductor part 110 is wrapped by the fire-resistant tape 200 in four or more layers, fire resistance can be increased, but the weight of the flexible bus bar 100 increases more than necessary, and furthermore, the unit cost of the product is increased. It becomes a rising factor.

Therefore, when winding the fireproof tape 200, the fireproof tape 200 may be wound around the conductor part 110 so as to have at least two overlapping layers in a predetermined section of the conductor part 110, and In detail, it is preferable that the fireproof tape 200 is wound around the conductor portion 110 so as to have two or three overlapping layers in a predetermined section of the conductor portion 110.

In this case, in the side of the winding angle at which the fireproof tape 200 is wound, the angle θ of 65 degrees to 80 degrees with respect to the longitudinal direction of the conductor portion 110 in a predetermined section of the conductor portion 110 Can be wound up.

For example, in order to maintain a two-ply overlapping state of the fireproof tape 200 in the entire area of the predetermined area of the conductor portion 110, the length of 65 degrees to 75 degrees with respect to the length direction of the conductor portion 110 It is wound while forming an angle (θ). Further, when the angle is 75 degrees to 80 degrees, a three-layer overlapping state may occur in at least some areas. Although the fire-resistant tape 200 may be wound up to achieve a three-ply overlapping state in all of the predetermined areas of the conductor part 110, the overlapping state is in consideration of the non-body and product cost of the flexible bus bar 100 Doedoe provided to form at least two plies, the area forming the overlap of three plies may be appropriately adjusted.

Meanwhile, FIG. 5 is a cross-sectional view taken along line'V-V' of FIG. 4 when the fireproof tape 200 is wound around the conductor 110 while forming two layers of overlapping.

Referring to FIG. 5, when the fireproof tape 200 has a width of a predetermined size and forms two or more overlapping layers, the fireproof tape 200 is 1 of the width in a predetermined section of the conductor part 110. It may be wound around the conductor part 110 so that /2 or more overlap. Specifically, in the case where the fireproof tape 200 forms two or three layers of overlap, the fireproof tape 200 in a predetermined section of the conductor part 110 is at least 1/2 and 2/3 of the width It may be wound around the conductor part 110 so that the following overlap.

That is, in the case of forming a two-ply overlap as shown in FIG. 5, it is wound so that 1/2 of the width of the fireproof tape 200 overlaps. For example, in FIG. 5, when the fireproof tape 200 has a predetermined width W and winds the fireproof tape 200 from left to right of the conductor part 110, the fireproof tape 200 is wound along the winding direction. In the upper half area W1 of the width, some of the fireproof tapes 200A overlap with the neighboring fireproof tapes 200C to form a two-ply overlapping state in the upper half area W1. Likewise, in the lower half region W2 of the width, some of the fireproof tapes 200A overlap with the neighboring fireproof tape 200B to form a two-ply overlapping state in the lower half region W2. Here, the widths of the upper half region W1 and the lower half region W2 correspond to 1/2 of the width W of the fireproof tape 200.

Meanwhile, FIG. 6 is a cross-sectional view taken along line'V-V' of FIG. 4 when the fireproof tape 200 is wound around the conductor part 110 while forming three layers of overlapping.

Referring to FIG. 6, 2/3 of the width of the fireproof tape 200 is wound so as to overlap. For example, in FIG. 6, when the fireproof tape 200 has a predetermined width W and winds the fireproof tape 200 from left to right of the conductor part 110, the fireproof tape 200 is wound along the winding direction. In the upper half area (W3) of the width, some fireproof tapes (200D) overlap with the adjacent fireproof tape (200E) and the fireproof tape (200G) in another area to form a three-ply overlapping state in the upper half area (W3). do. In addition, in the middle area W4 of the width, some of the fireproof tapes 200D overlap with the adjacent fireproof tape 200F and the fireproof tape 200E to form a three-ply overlapping state in the middle area W4. do. Likewise, in the lower half area W5 of the width, some of the fireproof tapes 200D overlap with the adjacent fireproof tape 200F and the fireproof tape 200H in another area, and overlap three layers in the lower half area W5. Form a state Here, the widths of the upper half region W3, the middle region W4, and the lower half region W5 correspond to 1/3 of the width W of the fireproof tape 200.

As a result, some of the fireproof tapes 200D are wound so that the adjacent fireproof tapes 200E in the upper half region W3 and the middle region W4 overlap with 2/3 of the width thereof. In addition, some of the fireproof tapes 200D are wound so that the adjacent fireproof tapes 200F and 2/3 of the width thereof overlap in the intermediate area W4 and the lower half area W5. Therefore, when the fire-resistant tape 200 forms a three-ply overlap, it is wound so that 2/3 of the width of the fire-resistant tape 200 overlaps.

Meanwhile, although not shown in the drawings, a tube member (not shown) surrounding the fireproof tape 200 may be further provided outside the flexible bus bar 100.

It is preferable that the tube member is fitted and mounted in the direction of an unwelded terminal portion before welding any one of the terminal portions 130 and 150.

The covering tube member may be a thermoplastic elastomer. Thermoplastic elastomers are polymeric materials that can be molded like plastics that become flexible at high temperatures and exhibit the properties of rubber elastomers at room temperature.

Thermoplastic elastomers (TPE) have the characteristics that they can use various methods used in general thermoplastic plastic processing as they are, and are excellent in economics because they can re-use waste generated during processing, and there is no need for use of plasticizers.

In addition, compared to thermoset rubber, the specific gravity is low, quality control is easy, and high-productivity processing equipment such as injection molding (blow molding) can be used, so the product production can be improved through partial changes in the hard and soft parts. It is possible to diversify, so it is easy to design parts. Thermoplastic elastomers have the advantage that they exhibit rubber elasticity under conditions of use and can be molded like thermoplastics under molding conditions.

In addition, the tube member may be made of a soft plastic material other than a thermoplastic elastomer.

Although the present specification has been described with reference to preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the claims described below. You will be able to do it. Therefore, if the modified implementation basically includes the elements of the claims of the present invention, all should be considered to be included in the technical scope of the present invention.

100: flexible bus bar
10: laminated plate conductor
110: conductor part
130, 150: terminal part
200: fireproof tape

Claims (12)

A conductor portion in which a plurality of plate-shaped conductors are stacked;
A terminal portion formed by welding at both ends in the length direction of the conductor portion; And
And a fire-resistant tape wound on the conductor portion so as to have at least two overlapping layers in a predetermined section of the conductor portion. The method of claim 1,
The fireproof tape is a flexible bus bar, characterized in that the winding of the conductor portion so as to have two or three layers of overlap in a predetermined section of the conductor portion. The method of claim 2,
The fireproof tape is a flexible busbar, characterized in that the mica layer is adhered to the top of the glass yarn fabric layer by an adhesive. The method of claim 2,
A flexible bus bar, further comprising a tube member surrounding the fireproof tape. A conductor portion in which a plurality of plate-shaped conductors are stacked;
A terminal portion formed by welding at both ends in the length direction of the conductor portion; And
A flexible busbar comprising: a fireproof tape having a width of a predetermined size and wound on the conductor portion so that 1/2 or more and 2/3 or less of the width overlap in a predetermined section of the conductor portion. The method of claim 5,
The flexible bus bar, characterized in that the terminal portion is formed with a fastening hole through which a plurality of plate-shaped conductors pass. The method of claim 6,
The flexible bus bar, characterized in that the conductor portion is bent at least once. The method of claim 6,
A flexible bus bar, further comprising a tube member surrounding the fireproof tape. A plurality of laminated plate conductors;
Terminal portions provided at both ends in the longitudinal direction of the plate-shaped conductor; And
And a fireproof tape wound around the plate-shaped conductor so as to form an angle of 65 degrees to 80 degrees with respect to the length direction of the conductor portion in a predetermined section of the plate-shaped conductor. The method of claim 9,
The fire-resistant tape is a flexible bus bar, characterized in that wound on the conductor portion to form an angle of 65 to 75 degrees with respect to the length direction of the conductor portion. The method of claim 10,
The flexible bus bar, characterized in that the terminal portion is welded, and a fastening hole penetrating the plurality of plate-shaped conductors is formed together. A conductor portion formed by stacking a plurality of plate-shaped conductors;
A terminal portion formed by welding at both ends in the length direction of the conductor portion; And
The conductor has a width of a predetermined size, has at least two overlaps in a predetermined section of the conductor part, overlaps more than 1/2 of the width, and forms an angle of 65 degrees to 80 degrees with respect to the length direction of the conductor part. A flexible bus bar comprising: a fireproof tape wound around the portion.

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