KR20190010132A - Connecting structure of ptc rod and busbar - Google Patents

Abstract

The present invention relates to a connection structure of a PTC rod and a bus-bar for heat exchange of an IGBT capable of stably connecting an electrode of the PTC rod to the bus-bar without compression and welding processes using additional brass pieces. More specifically, the present invention relates to a connection structure of a PTC rod and a bus-bar for heat exchange of the IGBT of a PTC heater which heats air for heating of a vehicle. The bus-bar is bent in an upside-down U shape in a connection groove of a guide member. Moreover, the bus-bar and the electrode of the PTC rod come into surface-contact with each other as the electrode of the PTC rod is inserted into the connection groove.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a connection structure between a PTC rod and a bus bar for heat exchange of an IGBT,

The present invention relates to a connection structure between a PTC rod and a bus bar for heat exchange of an IGBT. More specifically, the present invention relates to a connection structure of a PTC rod and a bus bar using a separate brass piece, To a connection structure of a bus bar and a PTC rod for heat exchange of an IGBT.

Generally, the vehicle is provided with an air conditioner for controlling the indoor temperature of the vehicle. An air conditioner installed in an internal combustion engine engine vehicle has a heat exchanger installed in a pipe through which cooling water circulates, and the temperature inside the vehicle is controlled by moving air to the heat exchanger.

Such an air conditioner uses waste heat formed in the engine. Recently, as interest in environmentally friendly energy has increased, related parts for electric vehicles are being developed rapidly. As electric vehicles do not generate waste heat like internal combustion engines, PTC heater, which is a separate electric heater, is used as a heat source .

The PTC heater used in this case is a PTC (Positive Temperature Coefficient) which is a semi-conductive ceramic element having a positive temperature coefficient. The PTC has a lower electrical resistance as the ambient temperature is higher before a certain temperature, The resistance increases to the Curie temperature, and the electrical resistance increases sharply as the temperature rises above the Curie temperature. It is the PTC heater that uses the characteristics of this PTC element to heat by using the heat formed from the PTC element.

On the other hand, to electrically connect the PTC load to the control module, connect the electrode of the PTC rod to the bus bar of the control module. However, since the electrode of the PTC rod is made of an aluminum material and the solder can not be soldered due to the nature of the material, a hole is drilled in the electrode made of aluminum, and a brass piece is inserted into the hole. However, this method has a problem in that the process is complicated due to the necessity of perforating the electrodes and pressing the brass pieces.

(Korean Patent No. 10-0401748, October 01, 2003)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide a PTC load and a bus capable of stably connecting an electrode of a PTC rod to a bus bar without using a separate brass piece, Thereby providing a connection structure of the bar.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to accomplish the above object, a connection structure of a PTC rod and a bus bar for heat exchange of an IGBT according to the present invention comprises a PTC rod for heat exchange of an IGBT of a PTC heater for heating air for heating a vehicle, , The bus bar is bent and bent in the shape of a circle in the connecting groove of the guide member and the electrodes of the bus bar and the PTC rod are in surface contact with each other as the electrode of the PTC rod is inserted into the connecting groove.

Preferably, the bus bar is composed of a bent portion of an 'shape and an extending portion extending from one end of the curved portion. The connecting groove has a contact portion in which a curved portion of the bus bar is located, And a fixing part to which an extension part of the fixing part is fixed.

The connection structure between the PTC rod and the bus bar for heat exchange of the IGBT according to the present invention is such that the bus bar and the PTC rod are in surface contact with each other by fitting the electrode of the PTC rod into the connection groove of the guide member in which the bus bar is built, It is possible to stably connect the electrodes of the PTC rod to the bus bar without performing the pressing and soldering processes.

Further, the electrode of the PTC rod is pressed in the connection groove due to the curved bent bus, so that the PTC rod and the bus bar are more stably fixed and coupled.

1 is a view showing a process of bonding a brass piece to an electrode of a conventional PTC rod.
2 is a perspective view illustrating a connection structure of a PTC rod and a bus bar for heat exchange of an IGBT according to an embodiment of the present invention.
3 is an exploded perspective view showing a structure of a PCT rod according to an embodiment of the present invention.
4 is a conceptual diagram showing a PTC device of a PTC rod according to an embodiment of the present invention coupled to an aluminum panel.
5 is a plan view showing a combined state of a PCT rod according to an embodiment of the present invention.
6 is a sectional view taken along the line AA in Fig.
7 is a sectional view taken along the line BB of Fig.
8 is a perspective view of a PTC core constituting a PTC heater including a PTC rod according to an embodiment of the present invention.
Fig. 9 is an enlarged view of the portion A in Fig.
Fig. 10A is a view showing that an IGBT is arranged in a PCT heater, and Fig. 10B is a view of Fig. 10A in the direction of "A ".

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. Further, the detailed description of known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated.

Also, throughout the specification, when an element is referred to as " including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise. Also, throughout the specification, the term " on " means located above or below a target portion, and does not necessarily mean that the target portion is located on the upper side with respect to the gravitational direction.

Hereinafter, the configuration and operation of an embodiment of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 is a view showing a process of bonding a brass piece to an electrode of a conventional PTC rod. 1, since the electrode of the PTC rod is made of an aluminum material and is not soldered due to the characteristics of an aluminum material, conventionally, in order to connect the electrode of the PTC rod to the bus bar, And the brass pieces are bonded to the electrodes, and then the brass pieces are soldered to the bus bars. However, such a method requires a separate brass piece and requires a complicated process due to the necessity of perforating the electrode and pressing the brass piece.

On the contrary, the connection structure of the PTC rod and the bus bar for heat exchange of the IGBT according to the embodiment of the present invention is such that the electrode of the PTC rod is stably installed in the bus bar without using a separate brass piece, Provides a connection structure of PTC load and bus bar that can be connected.

2 through 4, the electrode 125 of the PTC rod 100 is inserted into the connection groove 212 of the guide member 210 and is brought into surface contact with the bus bar 220. The PCT rod 100 includes a PTC element 110, a pair of aluminum panels 120, and a molding body 130.

The PTC elements 110 are formed in a rectangular shape and are arranged in plural in one direction. The PTC (Positive Temperature Coefficient) element has a characteristic that the resistance increases rapidly when the temperature rises at a certain temperature. Therefore, when the temperature rises above a certain level, the resistance becomes large, and the magnitude of the current that can flow through the resistor becomes small. As the current decreases, the amount of heat is reduced and the temperature drops again. When the temperature drops, the resistance is lowered and the heating is started. Therefore, the device has a constant temperature maintenance mechanism. Therefore, Can be applied.

The pair of aluminum panels 120 are disposed on the upper side and the lower side of the PTC device 110 to electrically connect the PTC device 110.

The molding body 130 serves to fill a void formed between the pair of aluminum panels 120 and the PTC device 110 by molding the PTC device 110 and the pair of aluminum panels 120.

Hereinafter, each of the PTC elements 110, the pair of aluminum panels 120, and the molding body 130 will be described in more detail.

5 to 7, a pair of aluminum panels 120 is formed of an upper panel 120a and a lower panel 120b, and includes first PTC device fixing portions 121a and 121b, And includes an element fixing portion 122a and 122b, a fixing groove 123, an inlet hole 124, and an electrode 125. [

Each of the aluminum panels 120a and 120b has first PTC device fixing portions 121a and 121b along the longitudinal direction. The first PTC element fixing portions 121a and 121b are arranged along the longitudinal direction and include a first PTC element fixing portion 121a disposed on the upper panel 120a and a first PTC element fixing portion 121b disposed on the lower panel 120b. The first PTC element fixing portions 121b are arranged in the staggered direction with respect to each other.

The first PTC device fixing portions 121a and 121b are integrally formed with the aluminum panels 120a and 120b because the first PTC device fixing portions 121a and 121b are formed by pressing one region inward from the respective aluminum panels 120a and 120b.

Since the first PTC device fixing portions 121a and 121b are arranged in the direction staggered with respect to each other, it is possible to firmly fix the PTC device 110 without the need to additionally provide a separate fixing member to the aluminum panels 120a and 120b And the holes 121c formed when the first PTC device fixing portions 121a and 121b are formed can smoothly flow resin into the molding body 130 when the molding body 130 is formed.

The second PTC device fixing part 122 includes first bending parts 122a and 122b formed by inclining the first and second PTC device fixing parts 121a and 121b at a predetermined angle in a direction to cover both sides of the PTC device 110, And a second bending portion 122b extending in a direction opposite to the direction in which the first bending portion 122a is formed. Here, the first bending portion 122a serves to firmly fix the PCT element 110 and the second bending portion 122b increases the bonding area with the molding body 130 to increase the bonding strength of the PCT element 110 Can be increased.

The fixing grooves 123 are formed on the respective aluminum panels 120a and 120b at regular intervals to fix the PTC elements 110 so that they can be seated while maintaining the spacing.

On the other hand, a pair of resin inlet holes 124 may be formed between the first PTC device fixing portions 121a disposed adjacent to each other. The pair of inlet holes 124 can guide the resin 130 to flow through the inlet holes 124 to allow the molding material 130 to be tightly formed when the molding body 130 is formed. Herein, the resin is a high molecular weight, generic name of a natural or synthetic solid or semi-solid organic product which does not have a definite melting point, and a detailed description will be omitted below.

The molding body 130 forms a PTC rod 100 by molding the aluminum panel 120 and the PTC element 110 with a resin. That is, the molding body 130 can be filled with the aluminum panel 120 and the PTC element 110 so as not to create a gap between the bending portions of the aluminum panel 120 by molding with the resin in the state where the aluminum panel 120 and the PTC element 110 are assembled, So that the PTC device 110 can be prevented from moving due to, for example, vibration during running of the vehicle.

At this time, the pair of electrodes 125 are integrally formed on each of the pair of aluminum panels 120a and 120b, and are protruded from the terminal 131 formed at the end of the molding body 130 in the direction staggered from each other. At this time, at least one of the pair of electrodes 125 forms a cathode and the other forms an anode. The electrode 125 is inserted into the connection groove 212 of the guide member 210 and is in surface contact with the bus bar 220 provided in the connection groove 212.

In the present invention, the molding body 130 does not connect the PTC element 110 and the pair of aluminum panels 120 in a preformed state but the PTC element 110 and the pair of aluminum panels 120 And a solid connection can be provided by molding the resin between them in a coupled state. Further, the PTC element fixing portion formed on the aluminum panel 120 can be used to provide a more rigid connection.

2, the PTC rod 100 is coupled to the control module 200, and the electrode 125 of the PTC rod 100 is connected to the control module 200 in a state where the PTC rod 100 and the control module 200 are coupled to each other. And contacts the bus bar 220 of the control module 200. The bus bar 220 is formed as a copper plate and electrically connects the electrodes 125 of the PTC rod 100. Any material can be used as long as the bus bar 220 can electrically connect the PTC rod 100. [

The control module 200 is provided with a guide member 210 and the bus bar 220 is disposed on the guide member 210. Specifically, the guide groove 210 is formed at both sides of the guide member 210, and the connection groove 212 is formed to extend along the longitudinal direction of the guide member 210. The connection groove 212 has a contact portion 214 on which the electrode 125 of the PTC rod 100 is in surface contact with the bus bar 220 and a contact portion 214 on one side of the contact portion 214 so that one end of the bus bar 220 is inserted and fixed. And a fixing part 213 extending downward from the lower part.

The bus bar 220 is composed of a curved portion 222 bent in the shape of ∩ and an extension portion 224 of which one end of the curved portion 222 extends downward. The extension portion 224 of the bus bar 220 is inserted into the fixing portion 213 of the connection groove 212 and the bent portion 222 is disposed in the contact portion 214 of the connection groove 212. The electrode 125 of the PTC rod 100 is inserted into the connection groove 212 of the guide member 210 in which the bus bar 220 is disposed, The surface contact of the contact surface 220 is made.

The curved portion 222 is disposed at a predetermined distance from the inner surface of the contact portion 214 so that the PTC rod 100 inserted into the connection groove 212 can be more stably fixed and engaged, Is smaller than the thickness of the electrode (125) of the PTC rod (100).

The connection structure between the PTC rod and the bus bar for heat exchange of the IGBT according to the embodiment of the present invention is such that the connection groove 212 of the guide member 210, Since the bus bar 220 and the PTC rod 100 are in surface contact with each other by fitting the electrode 125 of the bus bar 100 into the bus bar 220 without using a separate brass piece, The electrodes 125 can be stably connected.

The electrode 125 of the PTC rod 100 is pressed in the connecting groove 212 by the curved bent bus bar 220 so that the PTC rod 100 and the bus bar 220 are more stably fixed, There is an effect to be combined.

FIG. 8 is a perspective view of a PTC core including a PTC rod according to an embodiment of the present invention, and FIG. 9 is an enlarged view of a portion A in FIG.

8 and 9, the heat dissipation fin 300 is disposed between a plurality of PTC rods 100 disposed adjacent to each other in parallel to perform heat exchange between heat generated by the PTC element 110 and air It plays a role. Although the heat dissipation fins 300 are disposed only between the ends of the PTC rod 100 in the present invention, the heat dissipation fins 300 may be integrally arranged along the longitudinal direction of the PTC rod 100,

The shape of the radiating fin 300 may be formed in a lattice shape such as a flat plate fin, a louver fin, and a honeycomb structure so as to effectively perform heat exchange between the heat generated by the PTC device and the air, have.

The protection brackets 400 and 500 are disposed in such a manner as to surround a plurality of radiating fins 300 disposed between the plurality of PTC rods 100 and the PTC rods 100 along the upper, lower, left, and right sides. The protection brackets 400 and 500 have a pair of side brackets 400 and a pair of cover brackets 500 that are coupled through upper and lower ends of the side brackets 400.

The lower end of the side bracket 400 is coupled to the base fixing part fixed to the vehicle by a fit-engagement method, so that a rigid fastening can be maintained even by vibration or the like during running of the vehicle. Further, the electrodes of the PTC rod 100 protrude in a direction staggered with respect to each other. At least one electrode protruding in a direction staggered with each other is connected to the bus bar 200.

The side bracket 400 is a long iron plate formed to have a predetermined width and has a "[" shape in its entirety. Side bracket 400 has an embossed portion 410 protruding outwardly on its surface. A plurality of the embossed portions 410 are formed at predetermined intervals along the longitudinal direction of the side bracket 400. The embossing unit 410 may press the side bracket 400 inward through a pressing action of the inner surface of the outer housing in a process of joining an outer housing (not shown) on the outer side of the protective brackets 400 and 500, .

Like the side bracket 400, the cover bracket 500 is a long iron plate formed to have a predetermined width, and has a generally "[" shape. The cover bracket 500 is formed with a stepped groove 512 having an inwardly recessed shape formed on a bent portion 510 formed to be bent on both sides of the cover bracket 500, (410) is fitted on the stepped groove (512).

The protective brackets 400 and 500 function to stably fix the outer portion of the PTC core through the structure in which the bent portions overlap each other in the course of coupling. By performing a rounding process of a predetermined curvature on the bent portion, interference is minimized in the overlapping process.

The radiating fins that are in contact with the inner surface of the side bracket 400 of the radiating fin 300 are continuous in a staggered manner with the upper end of the radiating fin contacting the inner surfaces of the side brackets 400 and the cover brackets 500, And the surface of the side bracket 400 are alternately brought into contact with each other. The heat generated by the PTC device 110 can be efficiently transferred to the protection brackets 400 and 500 to enable heat dissipation.

As described above, according to the PTC core structure of the PTC heater according to the present invention, by embossing a predetermined shape on the outer surface of the side bracket among the protective brackets which entirely surrounds the plurality of radiating fins disposed between the plurality of PTC rods and the PTC rods, This ensures a stable fit between the PTC rod and the radiating fins in the process of securing the outer housing covering the bracket.

The present invention maintains the shape of the PTC core until the curing of the adhesive added in the laminating process in the process of wrapping the slopes of the sequentially stacked PTC core and radiating fins using the steel structure and improves the firmness of the PTC core against the external force .

The present invention forms an embossing on a side bracket among the protection brackets, and maintains the PTC core in close contact with one side when the outer housing is assembled on the protection bracket.

Fig. 10A is a view showing that an IGBT is arranged in a PCT heater, and Fig. 10B is a view of Fig. 10A in the direction of "A ".

Referring to FIG. 10, the IGBT is disposed below the PTC heater, and radiating fins (not shown) are disposed on one of both side surfaces along the longitudinal direction of the housing, and an insulating pad (not shown) surrounding the radiating fin is disposed. The heat sink is arranged perpendicular to the IGBT so that the height of the housing can be reduced without being influenced by the longitudinal size of the IGBT. In addition, the heat generated from the resistors connected in series and parallel to each other generated in the IGBT is circulated and used in the PTC heater, thereby increasing the thermal efficiency and greatly increasing the efficiency of the PTC heater. In addition, since the IGBT is arranged horizontally and is not affected by the length of the IGBT, the size of the IGBT is reduced, so that the weight of the vehicle is not increased, and the fuel consumption of the vehicle can be prevented from increasing.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that a constituent element can be implanted unless specifically stated otherwise, But should be interpreted to include additional components. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: PCT load 110: PCT element
120: aluminum panel 121: first PTC element fixing portion
122: second PTC element fixing portion 123: fixing groove
124: inlet hole 125: electrode
130: molding body 200: control module
210: guide member 212: connecting groove
220: Bus bar

Claims (3)

A connection structure of a bus bar and a PTC rod of a PTC heater for heating air for heating a vehicle,
The bus bar is bent and bent in a shape of '∩' in the connection groove of the guide member,
And an electrode of the PTC rod is in surface contact with the bus bar and the electrode of the PTC rod as the electrode of the PTC rod is inserted into the connection groove.
The method according to claim 1,
Wherein the bus bar comprises a curved portion of an ∩ 'shape and an extension portion extending from one end of the curved portion, and a connection structure between the PTC rod and the bus bar for heat exchange of the IGBT.
3. The method of claim 2,
Wherein the connection groove comprises a contact portion in which the curved portion of the bus bar is located and a fixing portion extending downward from one side of the contact portion and to which the extension portion of the bus bar is fixed. Connection structure.

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