Electrical conduction device and cooling system

Abstract

The purpose of the present invention is to cool an electroconductive medium more effectively. An electrical conduction device (20) comprises: an electroconductive tube (22); a first connection portion (30) connected to the electroconductive tube (22) at a first position (24); and a second connection portion (40) connected to the electroconductive tube (22) at a second position (26) that is separated from the first position (24) in the longitudinal direction of the electroconductive tube (22). The inner peripheral part of the electroconductive tube (22) has uneven portions (25, 27).

Description

Electrical conduction device and cooling system

[0001] The present disclosure relates to an electrical conduction device and a cooling system.

[0002] Patent Document 1 discloses a temperature management system with an electric wire that includes a refrigerant pipe through which refrigerant passes and an electric wire at least partially along at least part of the refrigerant pipe.

[0003] Japanese Patent Application Laid-Open No. 2020-196395

[0004] It is desired to more effectively cool the electrical conduction medium.

[0005] Therefore, an object of the present disclosure is to enable more effective cooling of the electrical conduction medium.

[0006] The electrical conduction device of the present disclosure includes an electrical conduction pipe, a first connection part connected to the electrical conduction pipe at a first position, and a second connection part connected to the electrical conduction pipe at a second position separated from the first position in the longitudinal direction of the electrical conduction pipe, and the inner peripheral part of the electrical conduction pipe has uneven parts, which is an electrical conduction device.

[0007] Further, the cooling system of the present disclosure is a cooling system including the above electrical conduction device, a refrigerant circulation pipe connected to one end and the other end of the electrical conduction pipe, and a refrigerant circulation device interposed in the refrigerant circulation pipe for circulating refrigerant through the electrical conduction pipe and the refrigerant circulation pipe.

[0008] According to the present disclosure, the electrical conduction pipe, which is an electrical conduction medium, is cooled more effectively.

[0009] FIG. 1 is an explanatory diagram showing a cooling system according to Embodiment 1. FIG. 2 is a perspective view showing an end portion of the electrical conduction device. FIG. 3 is a cross-sectional view showing the electrical conduction device. FIG. 4 is an explanatory diagram showing a process of attaching a terminal to form uneven parts. FIG. 5 is a partial cross-sectional view of an electrical conduction device 120 according to Embodiment 2. FIG. 6 is a perspective view showing an end portion of an electrical conduction pipe and a first connection part before attachment according to Embodiment 3. FIG. 7 is a partial perspective view showing the electrical conduction device. FIG. 8 is a partial cross-sectional view showing the electrical conduction device.

[0010] [Description of Embodiments of the Present Disclosure] First, embodiments of the present disclosure will be listed and described.

[0011] The electrical conduction device described herein is as follows:

[0012] (1) An electrical conduction device comprising an electrical conduction tube, a first connecting portion connected to the electrical conduction tube at a first position, and a second connecting portion connected to the electrical conduction tube at a second position located apart from the first position in the longitudinal direction of the electrical conduction tube, wherein the inner circumference of the electrical conduction tube has an uneven surface.

[0013] In this electrical conduction device, the electrical conduction tube, which acts as the electrical conduction medium, is cooled by the flow of a coolant through it. Heat exchange can be efficiently performed between the electrical conduction tube and the coolant through the uneven surface. Therefore, the electrical conduction tube is efficiently cooled by the coolant.

[0014] (2) The electrical conduction device of (1), wherein the first connection part and the second connection part are separate from the electrical conduction tube, the first connection part is attached to the electrical conduction tube in a first position, and the second connection part is attached to the electrical conduction tube in a second position.

[0015] As a result, the first and second connection parts are manufactured separately from the electrical conduction tube. Therefore, the electrical conduction tube can be easily processed into a shape suitable for refrigerant flow and wiring routes. The first and second connection parts can also be easily formed into a shape suitable for connection.

[0016] (3) An electrical conduction device according to (1) or (2), wherein the uneven portion may include a portion that extends to the inner circumference side of the first position.

[0017] As a result, the heat generated at the first connection point is transferred to the electrical conduction tube and then effectively transferred to the refrigerant through the uneven surface. Therefore, the first connection point is effectively cooled.

[0018] (4) The electrical conduction device according to (3), wherein at least a portion of the electrical conduction tube between the first position and the second position may be a continuous portion having the same inner circumferential shape in cross-section.

[0019] Thus, if at least a portion of the electrical conduction tube between the first and second positions has the same continuous inner circumferential shape in its cross-section, the refrigerant can flow smoothly through the electrical conduction tube.

[0020] (5) An electrical conduction device according to any one of (1) to (4), wherein the uneven portion includes a first uneven portion that extends only on the inner circumference side of the first position and a second uneven portion that extends only on the inner circumference side of the second position, and the intermediate section of the electrical conduction tube between the first position and the second position may be a continuous portion having the same inner circumference shape in cross-section.

[0021] This allows the heat generated at the first and second connection points to be effectively transferred to the refrigerant. As a result, the first and second connection points are effectively cooled. Furthermore, the refrigerant can flow smoothly between the first and second connection points.

[0022] (6) An electrical conduction device according to any one of (1) to (5), wherein the uneven portion may be a spiral groove or a groove along the longitudinal direction of the electrical conduction tube.

[0023] In this case, spiral grooves or grooves along the longitudinal direction of the electrical conduction tube can be easily machined inside the electrical conduction tube. Furthermore, the pressure loss of the refrigerant is reduced.

[0024] (7) Any one of (1) to (6) is an electrical conduction device, wherein the electrical conduction tube includes an inner circumferential projection that protrudes inward at the first position, and the uneven portion may be a recess that is partially recessed in the inner circumferential portion of the inner circumferential projection.

[0025] In this case, a partially recessed portion can be easily machined into the inner circumference protruding part of the electrical conduction tube.

[0026] (8) Any one of the electrical conduction devices from (1) to (7), wherein the first position may be away from the end of the electrical conduction tube.

[0027] Thus, when the first position is far from the end of the electrical conduction tube, it is easier to connect other pipes that carry the refrigerant to the end of the electrical conduction tube.

[0028] Furthermore, the cooling system of this disclosure is as follows:

[0029] (9) A cooling system comprising one of the electrical conduction devices described in (1) to (8), a refrigerant circulation pipe connected to one end and the other end of the electrical conduction pipe, and a refrigerant circulation device interposed in the refrigerant circulation pipe for circulating refrigerant to the electrical conduction pipe and the refrigerant circulation pipe.

[0030] [Details of Embodiments of the Disclosure] Specific examples of electrical conduction devices and cooling systems of the Disclosure will be described below with reference to the drawings. However, the Disclosure is not limited to these examples and is intended to include all modifications within the meaning and scope of the claims as indicated by the claims.

[0031] [Embodiment 1] The electrical conduction device and cooling system according to Embodiment 1 will be described below.

[0032] <About the Cooling System> Figure 1 is an explanatory diagram showing the cooling system 10. The cooling system 10 is a system for cooling the electrical conduction device 20. The cooling system 10 comprises the electrical conduction device 20, a refrigerant circulation pipe 12, and a pump 14.

[0033] The electrical conduction device 20 is a device that conducts electricity. The electrical conduction device 20 connects, for example, a power supply 18 and a power supply connection target 19. This cooling system 10 is mounted, for example, in a vehicle. In this case, the power supply 18 is, for example, a secondary battery mounted in the vehicle. The power supply connection target 19 is, for example, a charging socket to which a charging plug for charging the power supply 18 is connected. For example, the electrical conduction device 20 is a circuit that constitutes at least a part of an electrical circuit that connects the terminals of the charging socket and the terminals of the power supply 18.

[0034] The electrical conduction device 20 may be applied to other electrical circuits. For example, it may be applied to a circuit between a power source and a generator, a circuit between a power source and a load such as a motor, or a circuit between a drive circuit such as an inverter and a driven device such as a motor.

[0035] The refrigerant circulation pipe 12 is connected to one end and the other end of the electrical conduction pipe 22 of the electrical conduction device 20. The refrigerant circulation pipe 12 may be made of metal or resin. The refrigerant circulation pipe 12 may be a pipe with enough rigidity to maintain a certain shape or a pipe that is bendable.

[0036] The refrigerant circulating through the refrigerant circulation pipe 12 can also flow through the electrical conduction pipe 22.

[0037] A pump 14, which acts as a refrigerant circulation device, is interposed in the refrigerant circulation pipe 12. The pump 14 circulates the refrigerant through the electrical conduction pipe 22 and the refrigerant circulation pipe 12.

[0038] The refrigerant may be a liquid, a gas, or may change between gas and liquid states depending on the temperature.

[0039] A radiator 16 may be interposed in the refrigerant circulation pipe 12. The radiator is a device that exchanges heat between the refrigerant and the outside air. The radiator may be placed in a location exposed to the outside air.

[0040] It is not essential that a circulating refrigerant flows through the electrical conduction tube 22. For example, outside air may flow through the electrical conduction tube 22 as the refrigerant. In this case, the outside air may be forcibly sent into the electrical conduction tube 22 by a fan or the like, or it may flow through the electrical conduction tube 22 by natural airflow.

[0041] <About the Electrical Conduction Device> The electrical conduction device 20 will be explained in more detail. Figure 2 is a perspective view showing the end of the electrical conduction device 20. The end of the refrigerant circulation pipe 12 is shown in Figure 2. Figure 3 is a cross-sectional view showing the electrical conduction device 20.

[0042] The electrical conduction device 20 comprises an electrical conduction tube 22, a first connection part 30, and a second connection part 40.

[0043] The electrical conduction tube 22 is a tube formed of a conductor. The electrical conduction tube 22 may be cylindrical or rectangular. The electrical conduction tube 22 may extend straight or may be bent in the middle.

[0044] The electrical conduction pipe 22 may be a metal pipe. The electrical conduction pipe 22 may be formed of, for example, copper, a copper alloy, aluminum, or an aluminum alloy.

[0045] A first position 24 and a second position 26 are set on the electrical conduction pipe 22. In the longitudinal direction of the electrical conduction pipe 22, the first position 24 and the second position 26 are separated from each other.

[0046] The first connection part 30 is connected to the electrical conduction pipe 22 at the first position 24. The second connection part 40 is connected to the electrical conduction pipe 22 at the second position 26.

[0047] The first connection part 30 and the second connection part 40 are located apart from each other in the longitudinal direction of the electrical conduction pipe 22. Electricity flows through the electrical conduction pipe 22 between the first connection part 30 and the second connection part 40.

[0048] The first connection part 30 and the second connection part 40 are parts for connecting the electrical conduction pipe 22 to other electrical components.

[0049] In the present embodiment, with respect to the electrical conduction pipe 22, the first connection part 30 and the second connection part 40 are separate bodies. The first connection part 30 is attached to the electrical conduction pipe 22 at the first position 24. The second connection part 40 is attached to the electrical conduction pipe 22 at the second position 26.

[0050] It is also conceivable that the first connection part or the second connection part is an integral part with respect to the electrical conduction pipe. For example, an end portion of a metal pipe may be processed into a terminal shape connected to other electrical components, and the processed portion may be the first connection part or the second connection part.

[0051] The inner peripheral portion of the electrical conduction pipe 22 has concavo-convex portions 25, 27. The concavo-convex portions 25, 27 are not flat or smooth curved surfaces on the inner peripheral portion of the electrical conduction pipe 22, but are portions having concave, convex, or a combination of both concave and convex shapes.

[0052] The concavo-convex portions 25, 27 are shapes having concave, convex, or both concave and convex so that the inner peripheral surface of the electrical conduction pipe 22 does not have a similar shape to the outer peripheral surface of the electrical conduction pipe 22.

[0053] These irregularities 25 and 27 serve to increase the surface area of ​​the inner circumferential surface of the electrical conduction tube 22 compared to when the inner circumferential surface of the electrical conduction tube 22 is flat or a smooth curved surface.

[0054] Let's explain the structure of each part in more detail.

[0055] <Regarding the First Connection Part> The first connection part 30 will now be described. The first connection part 30 has a holding part 32 and a terminal part 34.

[0056] The holding portion 32 is the part that surrounds the first position 24 of the electrical conduction tube 22 and is connected to the electrical conduction tube 22.

[0057] As shown in Figure 4, for example, the holding portion 32 is initially formed as a cylindrical shape into which the electrical conduction tube 22 can be inserted. With the first position 24 of the electrical conduction tube 22 inserted into the holding portion 32, the holding portion 32 is deformed to reduce its diameter. As a result, the holding portion 32 is attached to the first position 24 while surrounding it.

[0058] The holding portion may, for example, be a U-shaped portion in its initial form, and this U-shaped portion may be crimped inward and attached to the first position.

[0059] The first connecting portion 30 does not necessarily have to be attached to the electrical conduction tube 22 by deformation. For example, the first connecting portion 30 may be attached to the electrical conduction tube 22 by soldering, welding, or solid-state bonding. It is not essential that the first connecting portion 30 is formed in a cylindrical or U-shape.

[0060] The terminal portion 34 is the part that is connected to another electrical component. The other electrical component is, for example, another terminal. The other terminal is, for example, a terminal block, a terminal connected to a charging gun pin, or a terminal at the end of another conductive device.

[0061] In this embodiment, the terminal portion 34 is a plate-shaped portion having a hole. With another terminal T superimposed on the terminal portion 34, the terminal T and the terminal portion 34 are fastened and fixed together using screws and nuts. The terminal portion 34 may be a portion that is inserted and connected to a mating terminal, or into which a mating terminal is inserted and connected.

[0062] The holding portion may be directly connected to other conductive paths. For example, the holding portion may be directly connected to the end of a busbar that forms another conductive path.

[0063] The first position 24 may be located away from the end of the electrical conduction tube 22. The first position 24 may be located near one end of the electrical conduction tube 22 and away from the edge of that end. The holding portion 32 is connected to the first position 24. By positioning the first position 24 away from the end of the electrical conduction tube 22, it becomes unnecessary to place the first connecting portion 30 at the end of the electrical conduction tube 22. This allows the refrigerant circulation tube 12 to be easily connected to the end of the electrical conduction tube 22.

[0064] For example, the refrigerant circulation pipe 12 is fitted onto the end of the electrical conduction pipe 22. In this state, a fastening member B, such as a cable tie, tightens the connection between the end of the refrigerant circulation pipe 12 and the end of the electrical conduction pipe 22. This connects the electrical conduction pipe 22 and the refrigerant circulation pipe 12 and maintains the connected state.

[0065] If the first position 24 is located away from the end of the electrical conduction tube 22, it is easier to secure an end region for fitting the refrigerant circulation tube 12 to the outside.

[0066] The second connection portion 40 may also have a holding portion 42 and a terminal portion 44, similar to the holding portion 32 and terminal portion 34 of the first connection portion 30. The connection structure between the electrical conduction tube 22 and the second connection portion 40 may be the same as the connection structure between the first connection portion 30 and the electrical conduction tube 22 and the first connection portion 30.

[0067] <Regarding the uneven portion> The uneven portions 25 and 27 only need to be located on at least a part of the inner circumference of the electrical conduction tube 22, and their formation region is arbitrary.

[0068] In this embodiment, the uneven portions 25 and 27 include a first uneven portion 25 located on the inner circumference side of the first position 24 and a second uneven portion 27 located on the inner circumference side of the second position 26.

[0069] The first uneven portion 25 may include a portion that extends to the inner circumference of the first position 24. It may also extend only to the inner circumference of the first position 24. The first position 24 is the portion to which the holding portion 32 of the first connecting portion 30 is attached, and therefore is the portion of the electrical conduction tube 22 located inside the holding portion 32.

[0070] The first uneven portion 25 may extend beyond the inner circumferential region of the first position 24.

[0071] The second uneven portion 27 may include a portion that extends to the inner circumference of the second position 26. The second uneven portion 27 may extend only to the inner circumference of the second position 26. The second position 26 is the portion to which the holding portion 42 of the second connecting portion 40 is attached, and therefore is the portion of the electrical conduction tube 22 located inside the holding portion 42.

[0072] The second uneven portion 27 may extend beyond the inner circumferential region of the second position 26.

[0073] The irregularities 25 and 27 on the inner circumference of the electrical conduction tube 22 may be formed by any method.

[0074] For example, it may be formed by the following processing method.

[0075] For example, as shown in Figure 4, the electrical conduction tube 22 is surrounded by the holding portion 42, and the holding portion 42 is deformed to reduce its diameter. At this time, the portion of the electrical conduction tube 22 surrounded by the holding portion 42 is also deformed toward the inner circumference. As a result, the electrical conduction tube 22 has inner circumference protrusions 24P and 26P that protrude toward the inner circumference in the portion inside the holding portion 42. For example, an inner circumference protrusion 24P is formed at the first position 24, and an inner circumference protrusion 26P is formed at the second position 26. The inner circumference protrusions 24P and 26P may be recessed in the area between positions 24 and 26 in the longitudinal direction of the electrical conduction tube 22, or they may be recessed over the entire area of ​​positions 24 and 26.

[0076] The inner circumferential protrusions 24P and 26P protrude inward from the inner circumference of the electrical conduction tube 22 relative to the portions adjacent to the inner circumferential protrusions 24P and 26P. Therefore, recesses can be easily formed in the inner circumferential protrusions 24P and 26P. For example, if a threading tool 50 is inserted into the electrical conduction tube 22, spiral grooves 25 and 27 can be easily formed in the inner circumferential protrusions 24P and 26P. In other words, the grooves 25 and 27 are spiral grooves.

[0077] Furthermore, the uneven portions 25 and 27 do not necessarily have to be spiral grooves. The uneven portions may extend along the longitudinal direction of the pipe as described in Embodiment 2, or they may be grooves extending along the circumferential direction of the pipe, a shape in which grooves or protrusions in different directions intersect, or a shape in which partial protrusions or recesses are scattered regularly or irregularly. Also, it is not essential that the uneven portions are formed on the inner circumferential protrusions 24P and 26P.

[0078] Furthermore, the first uneven portion 25 at the first position 24 and the second uneven portion 27 at the second position 26 may have the same shape or different shapes.

[0079] At least a portion of the electrical conduction tube 22 between the first position 24 and the second position 26 may be a continuous portion with the same inner circumferential shape in its cross-section. The cross-section is the cross-section of a plane perpendicular to the longitudinal direction of the electrical conduction tube 22. A continuous portion with the same inner circumferential shape in its cross-section is, for example, a portion where a small, similar-shaped portion relative to the outer circumferential surface of the electrical conduction tube 22 continues along the longitudinal direction of the electrical conduction tube 22. In a continuous portion with the same inner circumferential shape in its cross-section, the electrical conduction tube 22 does not need to be partially concave or convex in the circumferential or longitudinal direction. In this embodiment, the circular cross-section of the inner circumferential surface of the electrical conduction tube 22 is continuous along the longitudinal direction of the electrical conduction tube 22.

[0080] The intermediate section 28 of the electrical conduction tube 22 between the first position 24 and the second position 26 may be a continuous section with the same inner circumferential shape in its cross-section. In other words, the intermediate section 28 may be a continuous section with no irregularities and the same inner circumferential shape in its cross-section overall.

[0081] In this embodiment, inner circumferential protrusions 24P and 26P are formed in the intermediate region between the first position 24 and the second position 26 in the longitudinal direction of the electrical conduction tube 22, and these inner circumferential protrusions 24P and 26P do not extend beyond the first position 24 and the second position 26, respectively. Therefore, the portion from the intermediate section 28 to the end of the electrical conduction tube 22 closer to the center of the first position 24 and the second position 26 is free of irregularities, and the inner circumferential shape of the cross-section is the same and continuous portion.

[0082] In this embodiment, the outer end portions of the electrical conduction tube 22 beyond the first position 24 and the second position 26 are also free of irregularities, and the inner circumferential shape of the cross-section is the same and continuous.

[0083] <Effects, etc.> With the electrical conduction device 20 and cooling system 10 configured as described above, the electrical conduction tube 22 is cooled as the refrigerant flows through it. Since the surface area is large at the uneven parts 25 and 27, the electrical conduction tube 22 and the refrigerant can efficiently exchange heat through the uneven parts 25 and 27. Therefore, the electrical conduction tube 22 is efficiently cooled by the refrigerant.

[0084] Because the electrical conduction tube 22 is effectively cooled, it can be made thinner and lighter. This also makes it possible to miniaturize and lighten the wiring, including the electrical conduction device 120.

[0085] In addition, the first connection part 30 and the second connection part 40 are manufactured separately from the electrical conduction tube 22. Therefore, the electrical conduction tube 22 can be easily processed into a shape suitable for the flow of refrigerant and wiring routes. The first connection part 30 and the second connection part 40 can also be easily formed into a shape suitable for connection.

[0086] Furthermore, the first uneven portion 25 includes a portion that extends to the inner circumference of the first position 24. The first connecting portion 30 is connected to the mating connecting component. There is a possibility that heat will easily be generated at the contact point between the first connecting portion 30 and the mating connecting component. The heat generated at the contact point between the first connecting portion 30 and the mating connecting component is transferred to the first position 24 of the electrical conduction tube 22 and effectively transferred to the coolant through the first uneven portion 25. Therefore, the first connecting portion 30 is effectively cooled. The second connecting portion 40 is also effectively cooled.

[0087] Furthermore, at least a portion of the intermediate section 28 of the electrical conduction tube 22 includes a continuous section with the same inner circumferential shape in its cross-section. In this case, the refrigerant can flow smoothly through the electrical conduction tube 22, and the pressure loss of the refrigerant is reduced.

[0088] The first uneven portion 25 may exist only on the inner circumference side of the first position 24, and the second uneven portion 27 may be located only on the inner circumference side of the second position 26, and the entire intermediate section 28 may be a continuous portion with the same inner circumferential shape in cross-section. In this case, the heat generated at the first connection portion 30 and the second connection portion 40 is effectively transferred to the refrigerant at the first uneven portion 25 and the second uneven portion 27, and the first connection portion 30 and the second connection portion 40 are effectively cooled. In addition, the refrigerant can flow smoothly through the intermediate section 28, and the pressure loss is reduced.

[0089] If the uneven portions 25 and 27 are helical grooves, processing inside the electrical conduction tube 22 becomes easier. In addition, the pressure loss of the refrigerant is reduced.

[0090] The electrical conduction tube 22 includes an inner circumferential projection 24P that protrudes inward at a first position 24, and the first uneven portion 25 is a recess that is partially recessed in the inner circumferential portion of the inner circumferential projection 24P. This allows the first uneven portion 25 to be easily machined. The second uneven portion 27 can also be easily machined into an inner circumferential projection 26P.

[0091] Furthermore, the first position 24 is away from the end of the electrical conduction tube 22. Therefore, other pipes that carry refrigerant, such as the refrigerant circulation pipe 12, can be easily connected to the electrical conduction tube 22. The second position 26 is away from the other end of the electrical conduction tube 22, so other pipes can also be easily connected to the other end of the electrical conduction tube 22.

[0092] By circulating and supplying refrigerant through the electrical conduction tube 22 using the refrigerant circulation tube 12 and the pump 14, the electrical conduction device 20 can be effectively cooled.

[0093] [Embodiment 2] An electrical conduction device 120 according to Embodiment 2 will now be described. Figure 5 is a partial cross-sectional view of the electrical conduction device 120. In the description of this Embodiment 2, the same reference numerals are used for components similar to those described in Embodiment 1, and their descriptions are omitted.

[0094] The electrical conduction device 120 differs from the electrical conduction device 20 in that the shape of the uneven portion 125 corresponding to the first uneven portion 25 is different. In this embodiment, the uneven portion 125 is a groove along the longitudinal direction of the electrical conduction tube 122, which corresponds to the electrical conduction tube 22. More specifically, an inner circumferential projection 124P corresponding to an inner circumferential projection 24P is formed on the inner circumferential projection 124P of the electrical conduction device 120 at the first position 24 to which the first connection portion 30 is attached. A groove along the longitudinal direction of the electrical conduction tube 122 is formed as the uneven portion 125 on the inner circumferential projection 124P. The bottom surface of the groove of the uneven portion 125 may extend flush with the inner circumferential surface of the electrical conduction tube 22 adjacent to the inner circumferential projection 124P. The second uneven portion 27 may also be configured in the same way as the uneven portion 125.

[0095] The groove-shaped uneven portion 125 along the longitudinal direction of the electrical conduction tube 122 can also be easily formed inside the electrical conduction tube 122. Moreover, if the electrical conduction tube 122 has a partial inner circumferential protrusion 124P, the uneven portion 125 can be easily formed on the inner circumferential protrusion 124P.

[0096] Furthermore, if the uneven portion 125 has a groove shape that follows the longitudinal direction of the electrical conduction tube 122, the pressure loss of the refrigerant will be reduced.

[0097] This second embodiment also provides the same effects and benefits as the first embodiment, except for the effects and benefits resulting from the different shape of the uneven portion 125.

[0098] [Embodiment 3] An electrical conduction device 220 according to Embodiment 3 will be described. Figure 6 is a perspective view showing the end of the electrical conduction tube 222 and the first connection part 230 before installation. Figure 7 is a partial perspective view showing the electrical conduction device 220. Figure 8 is a partial cross-sectional view of the electrical conduction device 220.

[0099] In this embodiment, the electrical conduction tube 222 corresponding to the electrical conduction tube 22 is rectangular, more specifically, square. The first connection part 230 corresponding to the first connection part 30 has a holding part 232 corresponding to the holding part 32. The holding part 232 is rectangular and has a similar shape to the electrical conduction tube 222 but is larger than the electrical conduction tube 222.

[0100] With the holding portion 232 surrounding the electrical conduction tube 222, the holding portion 232 undergoes a reduction in diameter, thereby attaching the first connecting portion 230 to the electrical conduction tube 222. At this time, the portion of the electrical conduction tube 222 surrounded by the holding portion 232 becomes recessed, forming an inner circumferential projection 224P that protrudes inward from the electrical conduction tube 222. The inner circumferential projection 224P may protrude over the entire inner surface of the holding portion 232.

[0101] An uneven portion 225 corresponding to the uneven portion 25 is formed on the inner circumferential protrusion 224P. For example, the uneven portion 225 is formed in a groove shape that extends along the longitudinal direction of the electrical conduction tube 222. Similarly, the second connecting portion 40 may be attached to the other end of the electrical conduction tube 222, and an uneven portion may also be formed thereon.

[0102] This embodiment also provides the same effects and benefits as Embodiment 1 or 2, except for the effects and benefits due to differences in the shape of the uneven parts.

[0103] [Modifications] The components described in each of the above embodiments and modifications can be combined as appropriate, as long as they do not contradict each other.

[0104] 10 Cooling system 12 Refrigerant circulation pipe 14 Pump 16 Radiator 18 Power supply 19 Power supply connection target 20, 120, 220 Electrical conduction device 22, 122, 222 Electrical conduction pipe 24 First position 24P, 26P, 124P, 224P Inner circumference protrusion 25 First uneven part 26 Second position 27 Second uneven part 28 Intermediate section 30, 230 First connection part 32, 42, 232 Holding part 34, 44 Terminal part 40 Second connection part 50 Tool 125, 225 Uneven part B Binding member T Terminal

Claims

1. An electrical conduction device comprising: an electrical conduction tube; a first connecting portion connected to the electrical conduction tube at a first position; and a second connecting portion connected to the electrical conduction tube at a second position located apart from the first position in the longitudinal direction of the electrical conduction tube, wherein the inner circumference of the electrical conduction tube has an uneven surface.

2. An electrical conduction device according to claim 1, wherein the first connection part and the second connection part are separate from the electrical conduction tube, the first connection part is attached to the electrical conduction tube at a first position, and the second connection part is attached to the electrical conduction tube at a second position.

3. An electrical conduction device according to claim 1 or claim 2, wherein the uneven portion includes a portion that extends to the inner circumference side of the first position.

4. An electrical conduction device according to claim 3, wherein at least a portion of the electrical conduction tube between the first position and the second position is a continuous portion having the same inner circumferential shape in cross-section.

5. An electrical conduction device according to claim 1 or claim 2, wherein the uneven portion includes a first uneven portion extending only on the inner circumference side of the first position and a second uneven portion extending only on the inner circumference side of the second position, and the intermediate section of the electrical conduction tube between the first position and the second position is a continuous portion having the same inner circumference shape in cross-section.

6. An electrical conduction device according to claim 1 or claim 2, wherein the uneven portion is a spiral groove or a groove along the longitudinal direction of the electrical conduction tube.

7. An electrical conduction device according to claim 1 or claim 2, wherein the electrical conduction tube includes an inner circumferential projection that protrudes inward at the first position, and the uneven portion is a recess that is partially recessed in the inner circumferential portion of the inner circumferential projection.

8. An electrical conduction device according to claim 1 or claim 2, wherein the first position is away from the end of the electrical conduction tube.

9. A cooling system comprising: an electrical conduction device according to claim 1 or claim 2; a refrigerant circulation pipe connected to one end and the other end of the electrical conduction pipe; and a refrigerant circulation device interposed in the refrigerant circulation pipe for circulating refrigerant to the electrical conduction pipe and the refrigerant circulation pipe.

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