WO2016076452A1 - Different material case embedded capacitor, and capacitor igbt inverter housing assembly - Google Patents

Abstract

A different material case embedded capacitor comprising: capacitor elements (1) which are formed with dielectric film wound therearound and each have conductive thermally-sprayed surfaces at both sides thereof; a bus bar (3) which is electrically connected to both sides of the thermally-sprayed surfaces of the capacitor elements (1); and a different material case (100) in which an assembly of the capacitor elements and the bus bar is embedded, wherein the different material case (100) consists of a plastic part and a metal part which is made of a metal material having higher heat conductivity than the material of the plastic part, and forms all or at least a part of the wall surface of the different material case (100).

Description

Capacitors with Dissimilar Material Case, and Capacitor IGBT Inverter Housing Assembly

The present invention relates to a dissimilar material case embedded capacitor, or a dissimilar material case embedded capacitor composed of dissimilar materials of metal and plastic.

In general, capacitors for electric devices, fastening devices, electronic devices, and the like are widely used in various industrial fields. The capacitor uses a plastic film such as polyester (PET) resin, polypropylene (PP) resin, polyethylene naphthalate (PEN) resin, polycarbonate (PC) resin, polyphenylene sulfide (PPS) resin as a dielectric, Manufacture a capacitor device by winding a deposited film in which metal is deposited on one or both sides of the plastic film, and spraying zinc, zinc alloy, tin or primary zinc secondary tin on both sides of the wound deposited film. do. Capacitor capacitance varies according to the purpose of the capacitor, so the capacitors are manufactured by adding or subtracting the number of capacitor elements (hereinafter referred to as “elements”) to other N-pole bus bars and P-pole bus bars. Wire and the large capacity capacitor is connected to a plurality of devices to manufacture the capacitor. Japanese Patent Laid-Open No. 2001-0072178 (Panasonic) discloses a capacitor and a capacitor manufacturing method.

A capacitor was manufactured by injecting plastic, PPS, PBT, ABS, PC, etc. into a capacitor housing case material for a hybrid, electric vehicle, hydrogen fuel cell vehicle, and renewable inverter. 1) When switching inverters of hybrid and electric vehicles, there is a problem that heat is generated by discharging heat through the capacitor busbar and the case while generating heat in the capacitor while charging and discharging occurs in the capacitor. 2) Capacitor molding material is epoxy resin, urethane, silicone, etc., and the case is non-conductor plastic, so the thermal conductivity is low, so the heat generated from the capacitor element (element) is not easily released to the outside. Or poor pressure resistance may occur due to deterioration of the film. Capacitor life factor is a factor that determines the lifetime of the capacitor because the heat generation characteristics and heat dissipation function of the capacitor is different depending on the temperature and voltage used.

The present invention is to provide a capacitor with a built-in dissimilar material case by introducing a metal plate portion in the capacitor housing case, thereby easily dissipating heat generated inside the capacitor to the outside to prevent the life of the capacitor due to high temperatures during operation.

The present invention is to provide a capacitor, IGBT, inverter housing assembly that can be easily mounted to the metal plate portion of the capacitor housing case adjacent to the inverter heat sink (cooling means) to facilitate the heat dissipation inside the capacitor.

Capacitor elements 1 formed by winding a dielectric film and having conductive sprayed surfaces formed on both sides thereof,

A bus bar 3 electrically connected to both sides of the thermal sprayed surface of the capacitor elements 1,

Consists of a heterogeneous material case (100) containing the capacitor element and the busbar combination,

The dissimilar material case 100 is composed of a plastic part and a metal material having a higher thermal conductivity than the material of the plastic part, and comprises a metal part constituting all or at least part of a wall surface of the dissimilar material case 100. Capacitors with heterogeneous materials case.

According to the present invention, by introducing a metal plate portion in the capacitor housing case, it is possible to easily discharge the heat generated inside the capacitor to the outside to prevent the life of the capacitor due to the high temperature during operation, the capacitor, and the capacitor, To provide an IGBT, inverter housing assembly.

The present invention facilitates heat dissipation inside the capacitor by mounting a metal plate portion of the capacitor housing case adjacent to a portion close to the inverter heat sink (cooling means), and also allows the metal plate portion of the case to be positioned adjacent to the bus bar. It was configured to better release the generated heat.

1 is a block diagram of a capacitor built-in different material case according to an embodiment of the present invention.

Figure 2 (a, b) is a block diagram of a capacitor built-in different materials according to another embodiment of the present invention.

Figure 3 is a block diagram of a heterogeneous material case according to an embodiment of the present invention (manufacturing method explanatory diagram).

Figure 4 is a perspective view of a capacitor, IGBT, inverter housing assembly according to a second embodiment of the present invention.

5 is a cross-sectional view of a capacitor, an IGBT, and an inverter housing assembly according to a second embodiment of the present invention.

Figure 6 is a cross-sectional view of the capacitor, IGBT, inverter housing assembly according to the first embodiment of the present invention.

7 is a cross-sectional view of a capacitor, an IGBT, and an inverter housing assembly according to a third embodiment of the present invention.

Hereinafter, a housing-containing capacitor, a capacitor, an IGBT, and an inverter housing assembly having a heterogeneous material case according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 is a block diagram of a capacitor built-in different materials according to an embodiment of the present invention, Figure 2 (a, b) is a block diagram of a capacitor built-in different materials according to another embodiment of the present invention, Figure 3 Dissimilar materials case configuration diagram (manufacturing method explanatory diagram) according to an embodiment, Figure 4 is a perspective view of a capacitor, IGBT, inverter housing assembly according to a second embodiment of the present invention, Figure 5 is a capacitor according to a second embodiment of the present invention , IGBT, inverter housing assembly cross-sectional view, Figure 6 is a capacitor, IGBT, inverter housing assembly cross-sectional view according to a first embodiment of the present invention, Figure 7 is a capacitor, IGBT, inverter housing assembly cross-sectional view according to a third embodiment of the present invention to be.

As shown in FIGS. 1 to 3, a housing-integrated capacitor having a dissimilar material case according to an embodiment of the present invention includes a dissimilar material case in which a metal part having a different thermal conductivity from plastic is formed outside the case. do. Capacitor elements 1 formed by winding a dielectric film and having conductive sprayed surfaces formed on both sides thereof, busbars 3 electrically connected to both sides of the sprayed surfaces of the capacitors 1, and capacitor elements and busbars. Consists of a heterogeneous (different kind) material case 100 that incorporates a combination, the dissimilar material case 100 is composed of a plastic part, a metal material having a higher thermal conductivity than the material of the plastic part and wall surface of the dissimilar material case 100 It is preferable to include a metal portion constituting all or at least a portion of the. The dissimilar material case 100 is preferably configured to include a plastic wall portion 20 forming an inner wall of the case and having an insulating property, and a metal wall portion 10 which is configured to be in contact with all or part of an outer surface of the plastic wall portion 20. Do.

As shown in Figures 1 to 3, in a housing-integrated capacitor having a dissimilar material case according to an embodiment of the present invention, the dissimilar material case 100 is put the molded metal wall portion 10 in a plastic injection molding machine Preferably, the plastic wall portion 20 is molded by insert injection. The material of the metal wall part 10 is one selected from aluminum (Al), copper (Cu), zinc (Zn), magnesium (Mg), iron, lead, brass, and stainless steel, or aluminum (Al) or copper. It is preferably an alloy containing one metal selected from (Cu), zinc (Zn), magnesium (Mg), iron, lead, brass, and stainless steel.

1 to 3, more preferably, the material of the metal wall portion 10 is one selected from aluminum (Al), copper (Cu), and zinc (Zn), or aluminum (Al) copper (Cu). ) Zn (Zn) is an alloy containing one metal selected from magnesium, and is manufactured by a die casting pressure casting method in which a molten metal in which a selected material is dissolved is injected into a casting mold and then pressurized. The thickness of the metal wall 10 is 0.2 ~ 10mm, the plastic material forming the plastic wall (20) is preferably at least one selected from the group consisting of PPS, PBT, PP, PC, PET, ABS. Difficulties occur during the manufacturing process in the case of 0.2 mm or less, and thicker than necessary in the case of 10 mm or more, thereby increasing the weight and material cost.

The metal wall portion 10 may be configured outside at least one surface of the plastic wall portion 20. That is, in the case of a rectangular parallelepiped case, it may be configured even on a part of one surface of the five surfaces except for the opening.

 1 to 7, the plastic wall portion 20 is composed of one plastic wall 21 of the dissimilar material case 100 and a plastic side wall 23 surrounding the plastic wall 21. The metal wall portion 10 is preferably composed of a metal one wall 11 which is formed on the outer side of the plastic one wall 21 and a metal side wall 13 which is formed on the outer side of the plastic side wall 23. As shown in FIGS. 1 to 3, the dissimilar material case 100 includes one plastic wall 21 and one metal wall 11 forming one surface and five plastic side walls forming the other four surfaces except for the opening. It is preferably configured in the form of a rectangular parallelepiped comprising 23 and metal sidewalls 13.

As shown in FIGS. 4 to 7, the capacitor having a different material case built-in of the present invention is used for an inverter of a hybrid vehicle, an electric vehicle, a hydrogen fuel cell vehicle, and a plug-in electric vehicle, and the metal wall portion of the heterogeneous material case 100 ( 10 is preferably mounted to the inverter case bottom portion 210, the inverter case bottom portion 210 is cooled by the cooling means (300).

4 to 5 (test state diagram 2), the dissimilar material case built-in capacitor, the IGBT, and the inverter housing assembly of the present invention are equipped with a housing built-in capacitor having a dissimilar material case and a housing built-in capacitor. The inverter housing 200 and the IGBT electrically connected to the connection terminal of the housing built-in capacitor, the cooling means 300 for cooling the inverter housing 200 equipped with the IGBT. The metal wall 10 of the housing case 100 may be mounted to be in contact with the inverter case bottom 210, and the inverter case bottom 210 may be cooled by the cooling means 300.

As shown in FIG. 6 (test state diagram 1), the dissimilar material case embedded capacitor, the IGBT, and the inverter housing assembly of the present invention may include a dissimilar material case embedded capacitor, an inverter housing 200 to which the housing embedded capacitor is mounted. , An IGBT electrically connected to the connection terminal of the housing-embedded capacitor, and a cooling means 300 for cooling the inverter housing 200 in which the IGBT is mounted, wherein the inverter case bottom part 210 includes a cooling means ( Cooled by 300, the IGBT is positioned on the upper portion of the inverter case bottom 210, and is fixed to the dissimilar material case embedded capacitor on the IGBT by fixing means.

As shown in FIG. 6 (test state diagram 3), the dissimilar material case embedded capacitor, the IGBT, and the inverter housing assembly of the present invention may include an inverter housing 200 in which the dissimilar material case embedded capacitor and the housing embedded capacitor are mounted; IGBT electrically connected to the connection terminal of the housing-embedded capacitor, comprising a cooling means 300 for cooling the inverter housing 200 equipped with the IGBT, the IGBT is located on the top of the inverter case bottom 210, IGBT The dissimilar material case embedded capacitor is fixed to the upper part by a fixing means, and the dissimilar material case embedded capacitor is fixed to the opening of the inverter housing 200 to perform the cover function of the inverter housing 200 while serving as a capacitor. A metal pad may be interposed between the metal wall part 10 and the bottom portion 210 of the inverter case cooled by the cooling means 300 or thermal grease may be applied to improve cooling efficiency.

Hereinafter, the configuration and the effect of the present invention will be described in detail. As shown in Table 1, as a result of the temperature increase test, the temperature of the capacitor plastic housing was increased by about 10.2 ° C., but the temperature of the capacitor of the heterogeneous case embedded with the present invention was increased by 2.4 ° C. In order to enable mass production of the dissimilar material case of the present invention, the capacitor outer housing was made of a die-casting casting made of aluminum, and the die-casting housing was inserted into an injection molding machine to insert injection. The outer outer wall of the capacitor housing is made of aluminum and maximizes the internal heat dissipation effect.The housing from which the automotive inverter housing cover is injected into the capacitor aluminum die casting can be used as it is. Shorting was prevented.

Capacitors were fabricated from a die-cast die-cast housing and assembled on a mount inside a hybrid vehicle inverter housing, resulting in very low temperature rise and excellent characteristics. In the case of plastic, the mount was weak, but in the case of a die-cast housing made of aluminum, the mount part was made of aluminum, which was very strong and vibrated.

Test conditions: test voltage = 640Vdc, ripple current = 136Arms, switching frequency 16KHz, cooling water 65 ℃, capacitor ambient temperature 95 ℃, cooling water circulation was carried out while circulating at 7ℓ per minute.

In the case of the conventional plastic PPS case capacitor temperature rise test, the maximum temperature of the element was 105.4 ° C., and the temperature rise of the aluminum die-casting insert ejected capacitor of the present invention resulted in a drop of 97.3 ° C. to about -8.2 ° C. (Test state diagram 1, capacitor case). Is not in contact with the adjacent surfaces of the inverter cooling means)

This development item has a very high ambient temperature, so when the capacitor element temperature is used above 95 ℃, the life of the capacitor is greatly reduced, so the method for lowering the temperature is required. Aluminum die-casting insert of the capacitor The capacitor was manufactured by changing the concept so that the bottom surface of the injection housing could directly contact the inverter heat sink (cooling water circulation part). It was possible to lower the temperature rise. (Test state diagram 2, when the capacitor migration material case is in contact with the inverter cooling means.)

In case of temperature rise test of capacitors in which aluminum die-casting insert injection housing is installed on the upper part of the inside of the hybrid inverter, the maximum element temperature is 97.3 ℃ (test state diagram 1), and the bottom surface of the aluminum die-casting insert-injected capacitor housing is heatsink ) The temperature rise of the directly contacted capacitor resulted in a drop of 90.5 ° C (test state diagram 2) to about -6.7 ° C.

Incidentally, in order to maximize heat dissipation by maximizing contact between the bottom of the capacitor housing and the heat sink of the automobile, the test results showed that the internal temperature of the capacitor dropped about -1.5 ℃ further, but the unit price and work was increased. Considering the thermal pad and the like, even if the thermal pad is lowered to a temperature that does not deteriorate the life of the capacitor, it is judged that it is possible to attach without the thermal pad.

Incidentally, thermal grease was applied to the bottom of the capacitor to maximize the heat dissipation by making the contact of the bottom of the capacitor housing with the car's inverter heat sink better. Considering this, it is thought that it is possible to apply thermal grease without lowering the life of the capacitor even if thermal grease is not applied.

6) Test condition: Test voltage = 640Vdc, Ripple current = 136Arms, Switching frequency 16KHz, Cooling water 65 ℃, Ambient temperature 95 ℃, Cooling water circulation at 7L per minute on the bottom of capacitor housing

Table 1 division Oven Ambient Temperature ℃ Element Average Temperature ℃ ΔT ℃ Cooling water ℃ Capacitor mounted inside the inverter housing (no heat sink) PPS case 95.2 105.4 10.2 66.0 AL dissimilar material case 94.8 97.3 (※ 8.1 degrees Celsius decrease) 2.4 67.2 Attach capacitor to heat sink inside inverter housing AL dissimilar material case 94.4 90.5 (※ 14.9 degrees Celsius decrease) -3.9 67.1

Although the present invention has been described in connection with the above-mentioned preferred embodiments, the scope of the present invention is not limited to these embodiments, and the scope of the present invention is defined by the following claims, and equivalent scope of the present invention. It will include various modifications and variations belonging to.

The reference numerals set forth in the claims below are merely to aid the understanding of the present invention, not to affect the interpretation of the scope of the claims, and the scope of the claims should not be construed narrowly.

Capacitor elements 1 formed by winding a dielectric film and having conductive sprayed surfaces formed on both sides thereof,

A bus bar 3 electrically connected to both sides of the thermal sprayed surface of the capacitor elements 1,

Consists of a heterogeneous material case (100) containing the capacitor element and the busbar combination,

The dissimilar material case 100 is composed of a plastic part and a metal material having a higher thermal conductivity than the material of the plastic part, and comprises a metal part constituting all or at least part of a wall surface of the dissimilar material case 100. Capacitors with heterogeneous materials case.

According to the present invention, by introducing a metal plate portion in the capacitor housing case, it is possible to easily discharge the heat generated inside the capacitor to the outside to prevent the life of the capacitor due to the high temperature during operation, the capacitor, and the capacitor, To provide an IGBT, inverter housing assembly.

The present invention facilitates heat dissipation inside the capacitor by mounting a metal plate portion of the capacitor housing case adjacent to a portion close to the inverter heat sink (cooling means), and also allows the metal plate portion of the case to be positioned adjacent to the bus bar. It was configured to better release the generated heat.

Claims (15)

Capacitor with a built-in dissimilar material case, characterized in that it comprises a dissimilar material case formed by forming a metal portion different from the plastic and the thermal conductivity outside the case. Capacitor elements 1 formed by winding a dielectric film and having conductive sprayed surfaces formed on both sides thereof, A bus bar 3 electrically connected to both sides of the thermal sprayed surface of the capacitor elements 1, Consists of a heterogeneous material case (100) containing the capacitor element and the busbar combination, The dissimilar material case 100 is composed of a plastic part and a metal material having a higher thermal conductivity than the material of the plastic part, and comprises a metal part constituting all or at least part of a wall surface of the dissimilar material case 100. Capacitors with heterogeneous materials case. The method of claim 2, The dissimilar material case 100 is configured to include a plastic wall part 20 forming an inner wall of the case and having an insulating property, and a metal wall part 10 formed in contact with all or part of an outer surface of the plastic wall part 20. Capacitor with built-in dissimilar materials case. The method of claim 3, The dissimilar material case 100 includes a molded metal wall part 10 in a plastic injection molding machine, wherein the plastic wall part 20 is molded by insert injection. The method of claim 3, The material of the metal wall part 10 is one selected from aluminum (Al), copper (Cu), zinc (Zn), magnesium (Mg), iron, lead, brass, stainless steel, aluminum (Al), Capacitor with a different material case, characterized in that the alloy containing one metal selected from copper (Cu), zinc (Zn), magnesium (Mg), iron (iron), lead, brass, stainless steel. The method of claim 4, wherein The material of the metal wall part 10 is one selected from aluminum (Al), copper (Cu), and zinc (Zn), or includes one metal selected from aluminum (Al) copper (Cu) zinc (Zn) magnesium. Alloy, A capacitor with a built-in dissimilar material case, which is manufactured by a die casting pressure casting method in which a molten metal in which a selected material is dissolved in a casting mold is injected and then pressed. The method of claim 6, The thickness of the metal wall portion 10 is 0.2 ~ 10mm, The flat plastic material forming the plastic wall (20) is bi-material casing embedded capacitors, characterized in that at least one selected from the group consisting of PPS, PBT, PP, PC, PET, ABS. The method of claim 6, The metal wall portion (10) is a capacitor built-in different materials, characterized in that the at least one surface of the plastic wall portion 20 is configured on the outside. The method of claim 6, The plastic wall portion 20 is composed of one plastic wall 21 of the dissimilar material case 100 and a plastic side wall 23 surrounding the plastic wall 21, The metal wall portion 10 is composed of a metal one wall 11 is formed on the outer side of the plastic one wall 21 and a metal side wall 13 is formed on the outer side of the plastic side wall 23. Capacitors with dissimilar materials case. The method of claim 9, The dissimilar material case 100 includes a plastic one wall 21 and a metal one wall 11, which form one surface, and a plastic side wall 23 and a metal side wall 13, which form the other four surfaces, except for five openings. Capacitor with a heterogeneous material case, characterized in that consisting of a rectangular parallelepiped type. A housing-integrated capacitor with a heterogeneous material case as described in claim 1 selected from claims 2 to 10 is used, Used for inverter of hybrid car, electric car, hydrogen fuel cell car, plug-in electric car, The metal wall portion 10 of the dissimilar material case 100 is mounted to be in contact with the bottom of the inverter case 210, The inverter case bottom portion 210 is a capacitor built-in different materials, characterized in that the cooling means 300 is cooled. A housing-integrated capacitor having a heterogeneous material case according to one of claims 2 to 10, An inverter housing 200 in which the housing embedded capacitor is mounted; An IGBT electrically connected to a connection terminal of the housing embedded capacitor, Cooling means 300 for cooling the inverter housing 200 equipped with the IGBT, Consists of including The metal wall portion 10 of the housing case 100 is mounted to be in contact with the inverter case bottom portion 210, The inverter case bottom portion 210 is heterogeneous material case embedded capacitor, IGBT, inverter housing assembly, characterized in that the cooling means 300 is cooled. A capacitor with a different material case described in one of claims 2 to 10, An inverter housing 200 in which the housing embedded capacitor is mounted; An IGBT electrically connected to a connection terminal of the housing embedded capacitor, Cooling means 300 for cooling the inverter housing 200 equipped with the IGBT, Consists of including The inverter case bottom portion 210 is cooled by the cooling means 300, IGBT is located on the upper portion of the inverter case bottom 210, A heterogeneous material case-embedded capacitor, an IGBT, and an inverter housing assembly, which are fixed to the dissimilar material-case-embedded capacitor on the IGBT. A capacitor with a different material case described in one of claims 2 to 10, An inverter housing 200 in which the housing embedded capacitor is mounted; An IGBT electrically connected to a connection terminal of the housing embedded capacitor, Cooling means 300 for cooling the inverter housing 200 equipped with the IGBT, Consists of including IGBT is located on the upper portion of the inverter case bottom 210, On the upper part of the IGBT is fixed by means of fastening means to a capacitor with a built-in heterogeneous material The dissimilar material case embedded capacitor, IGBT, inverter housing assembly, characterized in that the capacitor is fixed to the opening of the inverter housing 200 to perform the cover function of the inverter housing 200 at the same time as a capacitor function. The method of claim 12, Heterogeneous material, characterized in that the cooling efficiency is improved by interposing a metallic pad or a thermal grease is applied between the metal wall portion 10 and the inverter case bottom portion 210 that is cooled by the cooling means 300. Integrated capacitors, IGBTs, inverter housing assembly.

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