JP2016054592A - Electric power conversion system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric power conversion system which enables improvement of heat radiation performance of a capacitor cell and makes downsizing easy.SOLUTION: An electric power conversion system 1 includes: a case body 2 opening at the upper side; a capacitor cell 11 housed in a part of the case body 2; and a potting material 12 which seals the capacitor cell 11. The case body 2 includes: a cell storage space 31 which stores the capacitor cell 11 so as to enclose the capacitor cell 11 from a lower surface and a side surface and is filled with the potting material 12; and a connection space 32 which is connected with the cell storage space 31 and has a bottom surface at a position higher than a bottom surface of the cell storage space 31. An entire periphery of an integrated space 3 formed by the cell storage space 31 and the connection space 32 is enclosed by a space side surface 211 extending to a position higher than an upper end 111 of the capacitor cell 11.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power conversion device.

  For example, in a power conversion device such as an inverter or a converter mounted on an electric vehicle or a hybrid vehicle, a capacitor is disposed in a capacitor housing portion in a case main body that houses the components (for example, Patent Document 1).

JP2013-55840A

  However, the power conversion device described in Patent Document 1 has room for improvement from the viewpoint of heat dissipation because the capacitor is not in direct contact with the case body.

  That is, it is conceivable that a capacitor is configured by disposing a capacitor cell in the capacitor housing portion of the case body and directly filling the potting material therewith. Thereby, since a potting material contacts a case main body directly, the heat dissipation of a capacitor | condenser can be improved.

  However, when such a structure is adopted, there are the following problems. That is, when the potting material is filled in the capacitor housing portion in which the capacitor cell is disposed, it is necessary to perform a filling operation while managing the potting surface in order to prevent the capacitor cell from being exposed from the potting surface. Since this filling operation may vary, it is necessary to make the potting surface sufficiently higher than the upper end of the capacitor cell in consideration of the variation, and accordingly, the depth of the capacitor housing portion needs to be sufficiently deep. . As a result, the main body case and thus the power conversion device are increased in size.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a power conversion device that can improve heat dissipation of a capacitor cell and can be easily reduced in size.

One aspect of the present invention is a case body having an open top;
A capacitor cell housed in a part of the case body;
A potting material for sealing the capacitor cell,
The case body accommodates the capacitor cell so as to surround the capacitor cell from a lower surface and a side surface, and is filled with the potting material, and is connected to the cell accommodation space and is a bottom surface of the cell accommodation space. And a connecting space having a bottom surface at a higher position,
The power conversion device is characterized in that an integral space including the cell housing space and the connection space is surrounded by a space side surface extending to a position higher than the upper end of the capacitor cell.

  In the above power conversion device, the case main body has a cell housing space that houses the capacitor cell so as to surround the capacitor cell from the lower surface and the side surface and is filled with a potting material. That is, the potting material is directly filled in the cell housing space of the case body. Thereby, the heat dissipation of a capacitor cell can be improved.

  Further, the case body has a connection space, and the integrated space composed of the cell accommodation space and the connection space is surrounded by the space side surface. Therefore, when potting material is poured into the cell storage space, even if the potting material overflows from the cell storage space, the potting material can flow into the connection space, so that the potting material overflows outside the integrated space. Can be prevented. Therefore, when the potting material is filled into the cell housing space so that the potting surface is positioned above the upper end of the capacitor cell, it is possible to suppress the potting surface from becoming high. In other words, even if the potting material is excessively injected, the potting surface is unlikely to be raised because a part of the potting material overflows into the connection space. Therefore, it is possible to prevent the potting material from overflowing without increasing the depth of the cell accommodation space. As a result, the case body can be easily reduced in size, and accordingly, the power converter can be easily reduced in size.

  As described above, according to the present invention, it is possible to provide a power conversion device that can improve heat dissipation of a capacitor cell and can be easily reduced in size.

The top view of the power converter device in Example 1. FIG. II-II arrow sectional drawing of FIG.

  In this specification, “upward” and “downward” are based on the posture of the case body when pouring the potting material into the case body, and when the power converter is mounted on an automobile, etc. It is unrelated to the direction of use.

  In the power conversion device, it is preferable that the potting material is continuously arranged over the cell accommodation space and the connection space. In this case, the potting surface can be easily adjusted. That is, in the region above the bottom surface in the connection space, the horizontal cross-sectional area of the integrated space is large, so in the region, the rising speed of the liquid surface when pouring the potting material can be reduced, and the liquid Fine adjustment of the surface can be facilitated. Therefore, in order to obtain a power conversion device in which the potting material is continuously arranged over the cell accommodation space and the connection space, it is necessary to design the potting surface to be positioned largely above the upper end of the capacitor cell. Absent. As a result, the case body can be more easily downsized, and accordingly, the power converter can be further downsized.

  Moreover, it is preferable that the bottom surface of the connection space is formed below the upper end of the capacitor cell. In this case, it is easy to adjust the liquid level in the vicinity of the upper end of the capacitor cell when the potting material is injected into the case body.

(Example 1)
An embodiment of the power conversion device will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the power conversion device 1 of the present example includes a case main body 2 that opens upward, a capacitor cell 11 accommodated in a part of the case main body 2, and potting that seals the capacitor cell 11. Material 12. The case body 2 houses the capacitor cell 11 so as to surround the capacitor cell 11 from the lower surface and the side surface, and is connected to the cell housing space 31 and filled with the potting material 12, and is connected to the cell housing space 31. And a connection space 32 having a bottom surface 321 at a position higher than the bottom surface 311. The integral space 3 including the cell housing space 31 and the connection space 32 is surrounded by a space side surface 211 extending to a position higher than the upper end 111 of the capacitor cell 11.

  The cell accommodation space 31 and the connection space 32 have a substantially rectangular parallelepiped shape. As shown in FIG. 2, the dimension of the cell accommodation space 31 in the height direction Z is smaller than the dimension of the connection space 32 in the height direction Z. The upper surface 312 of the cell housing space 31 and the upper surface 322 of the connection space 32 are formed to be flush with each other. On the other hand, the bottom surface 321 of the connection space 32 is positioned higher than the bottom surface 311 of the cell accommodation space 31. As shown in FIGS. 1 and 2, the cell accommodation space 31 and the connection space 32 are in contact with each other on the side surfaces and communicate with each other.

  Further, the case main body 2 has a main circuit portion accommodation space 6 in which a semiconductor module 4 incorporating a switching element and a cooler 5 for cooling the semiconductor module 4 are accommodated. The connection space 32 is disposed adjacent to the upper side of the main circuit portion accommodation space 6. Further, the cell accommodating space 31 is disposed adjacent to the side of the main circuit portion accommodating space 6.

  The case body 2 has a plurality of outer peripheral wall portions 21 standing in the height direction Z, and a plurality of partition wall portions 22 that partition the space inside the outer peripheral wall portion 21 in a direction (horizontal direction) perpendicular to the height direction Z. And a plurality of bottom wall portions 23 extending in the horizontal direction are integrally formed.

  The integral space 3 including the cell housing space 31 and the connection space 32 is surrounded by a part of the outer peripheral wall part 21, a part of the partition wall part 22, and a part of the bottom wall part 23. A bottom wall 311 surrounding the integrated space 3 forms a bottom surface 311 of the cell housing space 31 and a bottom surface 321 of the connection space 32. A space side surface 211 surrounding the integral space 3 is formed by the outer peripheral wall portion 21 and the partition wall portion 22 surrounding the integral space 3.

  The main circuit portion accommodating space 6 has a substantially rectangular parallelepiped shape. The main circuit housing space 6 is surrounded by a part of the outer peripheral wall part 21, a part of the partition wall part 22, and a part of the bottom wall part 23 in the case main body 2.

  The semiconductor module 4 includes a switching element such as IGBT (Insulated Gate Bipolar Transistor) and a diode such as FWD (Free Wheel Diode). As shown in FIG. 2, the semiconductor module 4 includes a power terminal 41 and a control terminal 42 that protrude in opposite directions in the height direction Z.

  As shown in FIG. 1, the cooler 5 includes a plurality of cooling pipes 51 and a plurality of connecting pipes 52 that connect the plurality of cooling pipes 51 to each other at both ends in the longitudinal direction. And the semiconductor module 4 and the cooling pipe 51 are laminated | stacked, and the semiconductor lamination | stacking unit 10 is comprised. That is, the semiconductor module 4 is sandwiched by the pair of cooling pipes 51 from both main surfaces. The cooler 53 is made of a metal having excellent thermal conductivity such as aluminum. On one side in the stacking direction X of the semiconductor stacked unit 10, the pressing member 13 is arranged in an elastically deformed state. Thereby, the semiconductor multilayer unit 10 is in a state of being pressurized in the stacking direction X.

  A cooling pipe 51 disposed at one end in the stacking direction X is connected to a cooling medium introduction pipe 53 and a cooling medium discharge pipe 54 for introducing and discharging the cooling medium to and from the cooling pipe 51, and their tips are connected to the case body 2. Projecting outward from

  The cooling medium introduced from the refrigerant introduction pipe 53 passes through the connection pipe 52 as appropriate, is distributed to the respective cooling pipes 51 and circulates in the longitudinal direction thereof. The cooling medium exchanges heat with the semiconductor module 4 while flowing through each cooling pipe 51. The cooling medium whose temperature has increased due to heat exchange passes through the downstream connecting pipe 52 as appropriate, is led to the refrigerant discharge pipe 54, and is discharged from the cooler 5.

  Examples of the cooling medium include natural refrigerants such as water and ammonia, water mixed with ethylene glycol antifreeze, fluorocarbon refrigerants such as Fluorinert (registered trademark), Freon refrigerants such as HCFC123 and HFC134a, methanol, alcohol An alcohol-based refrigerant such as acetone or a ketone-based refrigerant such as acetone can be used.

  As shown in FIG. 2, the bottom wall portion 23 disposed below the connection space 32 is positioned above one end portion in the longitudinal direction of the cooling pipe 51 in the main circuit portion accommodation space 6. That is, the connection space 32 is adjacently disposed above one end portion in the longitudinal direction of the cooling pipe 51 in the main circuit portion accommodation space 6. That is, the connection space 32 is located above a part of the cooler 5. The cell housing space 31 is disposed adjacent to the main circuit portion housing space 6 on the side opposite to the protruding side of the refrigerant introduction pipe 53 and the refrigerant discharge pipe 54 in the stacking direction X. Further, a part of the partition wall part 22 surrounding the cell accommodation space 31 also constitutes a part of the partition wall part 22 surrounding the main circuit part accommodation space 6.

  One or a plurality of capacitor cells 11 are arranged in the cell housing space 31. In this example, a plurality of capacitor cells 11 are arranged in the cell accommodating space 31. The potting material 12 is filled around the capacitor cell 11 in the cell housing space 31. The potting material 12 is also disposed in the connection space 32. That is, the potting material 12 is continuously arranged over the cell accommodation space 31 and the connection space 32. As shown in FIG. 2, the potting material 12 is filled so that the potting surface 121, which is the surface of the potting material 12, is positioned higher (upper side) than the bottom surface 321 of the connection space 32.

  A bottom surface 321 of the connection space 32 is formed below the upper end 111 of the capacitor cell 11. Here, the upper end 111 of the capacitor cell 11 means the upper end at the highest position among the plurality of capacitor cells 11 when they have different upper ends. The potting surface 121 is located above the upper end 111 of the capacitor cell 11 and below the upper ends of the outer peripheral wall 21 and the partition wall 22 that surround the integrated space 3.

  When manufacturing the power conversion device 1 of the present example, the following procedure is used to seal the capacitor cell 11 with the potting material 12 in the cell housing space 31.

  First, the capacitor cell 11 is arranged at a predetermined position in the cell housing space 31. Then, the liquid potting material 12 is injected around the capacitor cell 11 in the cell housing space 31. When the liquid level of the potting material 12 gradually rises and the liquid level reaches the height of the bottom surface 321 of the connection space 32, the potting material 12 spreads in the connection space 32. When the potting material 12 spreads to the connection space 32, the liquid level rising speed of the potting material 12 becomes gentle. That is, even if the injection amount of the potting material 12 per unit time is the same, the rising speed of the liquid level decreases. When the liquid level of the potting material 12 reaches a predetermined height above the upper end 111 of the capacitor cell 11, the injection of the potting material 12 is stopped. Then, the potting material 12 is cured.

  As described above, the capacitor cell 11 can be sealed with the potting material 12.

Next, the function and effect of this example will be described.
In the power conversion device 1, the case body 2 has a cell housing space 31 that houses the capacitor cell 11 so as to surround the capacitor cell 11 from the lower surface and the side surface and is filled with the potting material 12. That is, the potting material 12 is directly filled in the cell accommodating space 31 of the case body 2. Thereby, the heat dissipation of the capacitor cell 11 can be improved.

  The case body 2 has a connection space 32, and the entire space of the integrated space 3 including the cell accommodation space 31 and the connection space 32 is surrounded by the space side surface 211. Therefore, even when the potting material 12 overflows from the cell housing space 31 when the potting material 12 is poured into the cell housing space 31, the potting material 12 can flow into the connection space 32. It is possible to prevent overflowing outside the integrated space 3. Therefore, when the potting material 12 is filled in the cell housing space 31 so that the potting surface 121 is positioned above the upper end 111 of the capacitor cell 11, it is possible to suppress the potting surface 121 from becoming high. That is, even if the potting material 12 is excessively injected, the potting surface 121 is unlikely to be raised because a part of the potting material 12 overflows into the connection space 32. Therefore, the potting material 12 can be prevented from overflowing without increasing the depth of the cell housing space 31. As a result, it is possible to easily reduce the size of the case body 2, and accordingly, it is possible to easily reduce the size of the power converter 1.

  Further, the potting material 12 is continuously arranged over the cell accommodation space 31 and the connection space 32. Thereby, the potting surface 121 can be adjusted easily. That is, in the region above the bottom surface in the connection space 32, the horizontal sectional area of the integrated space 3 is large. Therefore, in the region, the rising speed of the liquid level when the potting material 12 is injected can be reduced. And fine adjustment of the liquid level can be facilitated. Therefore, when obtaining the power conversion device 1 in which the potting material 12 is continuously arranged across the cell housing space 31 and the connection space 32, the potting surface 121 is positioned largely above the upper end 111 of the capacitor cell 11. There is no need to design it. As a result, the case main body 2 can be more easily downsized, and accordingly, the power conversion device 1 can be further downsized.

  Further, the bottom surface of the connection space 32 is formed below the upper end 111 of the capacitor cell 11. This facilitates liquid level adjustment near the upper end 111 of the capacitor cell 11 when the potting material 12 is injected into the case body 2.

  Further, the case body 2 has a main circuit part accommodation space 6, and the connection space 32 is disposed adjacent to the upper side of the main circuit part accommodation space 6. Therefore, the potting material 12 disposed in the connection space 32 can be cooled by the cooler 5 disposed in the main circuit portion accommodation space 6. Moreover, since the dead space above the main circuit unit accommodation space 6 can be effectively used, the power converter 1 can be further reduced in size.

  Further, the cell accommodating space 31 is disposed adjacent to the side of the main circuit portion accommodating space 6. Therefore, the condenser cell 11 and the potting material 12 disposed in the cell housing space 31 can be cooled by the cooler 5 disposed in the main circuit portion housing space 6.

  As described above, according to this example, it is possible to provide the power conversion device 1 that can improve the heat dissipation of the capacitor cell 11 and can be easily reduced in size.

  In addition, although the example which showed the potting material continuously arrange | positioned over the cell accommodation space and the connection space was shown in the Example, this invention is not limited to this. That is, the potting material may be filled only in the cell housing space without filling the connection space. In this case, the capacitor cell can be prevented from being exposed from the potting surface by forming the bottom surface of the connection space above the upper end of the capacitor cell.

  In addition, the present invention can take various aspects. For example, in the above embodiment, the case body has one connection space, but a plurality of connection spaces may be provided.

DESCRIPTION OF SYMBOLS 1 Power converter 11 Capacitor cell 12 Potting material 2 Case main body 211 Space side surface 3 Integrated space 31 Cell accommodation space 32 Connection space

Claims (5)

A case body (2) having an open top;
A capacitor cell (11) housed in a part of the case body (2);
A potting material (12) for sealing the capacitor cell (11), and a power converter (1) comprising:
The case body (2) accommodates the capacitor cell (11) so as to surround the capacitor cell (11) from a lower surface and a side surface, and a cell housing space (31) filled with the potting material (12). A connection space (32) connected to the cell storage space (31) and having a bottom surface (321) at a position higher than the bottom surface (311) of the cell storage space (31),
The integral space (3) composed of the cell accommodation space (31) and the connection space (32) is entirely surrounded by a space side surface (211) extending to a position higher than the upper end (111) of the capacitor cell (11). The power converter device (1) characterized by being enclosed.   2. The power conversion device (1) according to claim 1, wherein the potting material (12) is arranged continuously over the cell accommodation space (31) and the connection space (32).   The power converter (1) according to claim 1 or 2, wherein a bottom surface (321) of the connection space (32) is formed below an upper end (111) of the capacitor cell (11). ).   The case body (2) has a main circuit part accommodating space (6) that accommodates a semiconductor module (4) incorporating a switching element and a cooler (5) for cooling the semiconductor module (4), The said conversion space (32) is adjacently arranged above the said main circuit part accommodation space (6), The power converter device (1) as described in any one of Claims 1-3 characterized by the above-mentioned.   The said cell accommodation space (31) is a power converter device (1) as described in any one of Claims 1-4 arrange | positioned adjacent to the side of the said main circuit part accommodation space (6).

Images