CN-122003806-A - Power conversion device and motor module

Abstract

The invention provides a capacitor module having a capacitor element and a case portion accommodating the capacitor element, a power module having a power semiconductor element for performing power conversion, a control board for driving the power module, and a bus bar module having bus bars. The capacitor element has a capacitor body portion and a first connection terminal extending from the capacitor body portion to one side in a first direction. The power module has a second connection terminal. The bus bar electrically connects the first connection terminal and the second connection terminal. The case portion includes a first accommodating portion recessed from one side in the first direction to the other side in the first direction and accommodating the capacitor main body portion, and a first flow path through which the refrigerant flows.

Inventors

• SUGAWARA YURI

Assignees

• 尼得科株式会社

Dates

Publication Date

20260508

Application Date

20240620

Priority Date

20231129

Claims (9)

1. 1. A power conversion device is provided with: A capacitor module having a capacitor element and a case portion accommodating the capacitor element; A power module having a power semiconductor element for performing power conversion; a control substrate driving the power module, and A bus bar module having a bus bar, The capacitor element has a capacitor body portion and a first connection terminal extending from the capacitor body portion to one side in a first direction, The power module has a second connection terminal, The bus bar electrically connects the first connection terminal and the second connection terminal, The housing portion has: a first accommodation portion recessed from one side of the first direction to the other side of the first direction for accommodating the capacitor main body portion, and And a first flow path through which the refrigerant flows.
2. 2. The power conversion device according to claim 1, wherein, The housing part is provided with a first housing part for the first accommodating part to be arranged and a second housing part for the second accommodating part for accommodating the first housing part to be arranged, The first flow path is formed by an outer surface of the first housing portion and an inner surface of the second housing portion.
3. 3. The power conversion device according to claim 2, wherein, The first housing part is made of metal.
4. 4. The power conversion device according to claim 2, wherein, The first housing portion is provided with a plurality of protruding portions protruding into the first flow path.
5. 5. The power conversion device according to claim 2, wherein, The second housing part is made of resin, and is molded by insert molding using the first housing part as an insert member.
6. 6. The power conversion device according to claim 1, wherein, The bus bar module has a plurality of the bus bars and a first holding member made of resin for holding the plurality of the bus bars, The first holding member is molded by insert molding of a plurality of the bus bars as insert members.
7. 7. The power conversion device according to claim 1, wherein, The first connection terminal and the bus bar are fixed by welding.
8. 8. The power conversion device according to claim 1, wherein, The power conversion device includes a holding unit for holding the power module, The holding portion is provided with a second flow path through which the refrigerant flows.
9. 9. A motor module is provided with: The power conversion apparatus according to any one of claims 1 to 8, and And a motor driven by the current supplied from the power conversion device.

Description

Power conversion device and motor module Technical Field The present invention relates to a power conversion device and a motor module. Background As a power conversion device for supplying electric power to a motor, for example, a power conversion device is disclosed which includes a power module unit having a power semiconductor, a capacitor unit having a capacitor element, and a refrigerant flow path through which a refrigerant for cooling the capacitor element flows, the power module unit and the capacitor element being electrically connected by a bus bar (for example, japanese patent application laid-open No. 2013-031330). Prior art literature Patent literature Patent document 1 Japanese patent laid-open publication No. 2013-031330 Disclosure of Invention Problems to be solved by the invention In the power conversion device described in patent document 1, since the bus bar is arranged between the capacitor element and the refrigerant flow path, the thermal resistance between the capacitor element and the refrigerant flow path tends to be large. Therefore, it is difficult to increase the amount of heat transferred from the capacitor element to the refrigerant flowing in the refrigerant flow path, and the temperature of the capacitor element may become excessively high. Thereby, deterioration of the capacitor element may be promoted. In view of the above, an object of the present invention is to provide a power conversion device and a motor module capable of suppressing the temperature of a capacitor element from becoming excessively high. Solution for solving the problem The power conversion device comprises a capacitor module having a capacitor element and a case portion for accommodating the capacitor element, a power module having a power semiconductor element for performing power conversion, a control board for driving the power semiconductor element, and a bus bar module having a bus bar. The capacitor element has a capacitor body portion and a first connection terminal extending from the capacitor body portion to one side in a first direction. The power module has a second connection terminal. The bus bar electrically connects the first connection terminal and the second connection terminal. The case portion includes a first accommodating portion recessed from one side of the first direction to the other side of the first direction and accommodating the capacitor main body portion, and a first flow path through which a refrigerant flows. The motor module according to one embodiment of the present invention includes the power conversion device described above, and a motor driven by a current supplied from the power conversion device. Effects of the invention According to an aspect of the present invention, in the power conversion device and the motor module, the temperature of the capacitor element can be suppressed from becoming excessively high. Drawings Fig. 1 is a perspective view showing a motor module according to a first embodiment. Fig. 2 is a perspective view showing a part of the motor module according to the first embodiment. Fig. 3 is a cross-sectional view showing a part of the power conversion device according to the first embodiment. Fig. 4 is a cross-sectional view showing a part of the power conversion device according to the first embodiment, and is an IV-IV cross-sectional view of fig. 3. Fig. 5 is a cross-sectional view showing a part of the power conversion device according to the second embodiment. Detailed Description Hereinafter, a power conversion device according to an embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and may be arbitrarily changed within the scope of the technical idea of the present invention. In the drawings below, the actual structure may be different from the scale, the number, and the like, for easy understanding of the respective structures. < First embodiment > In the following description, the first direction D1 is appropriately shown in each drawing. In the present embodiment, the first direction D1 is the up-down direction of the power conversion device 10. In the following description, the side toward which the arrow of the first direction D1 is directed (+d1 side) is referred to as "one side of the first direction D1" or "upper side". The side opposite to the side toward which the arrow of the first direction D1 faces (-D1 side) is referred to as "the other side of the first direction D1" or "the lower side". In the following description, the second direction D2 is appropriately shown in each drawing. In the present embodiment, the second direction D2 is the left-right direction of the power conversion device 10. The second direction D2 intersects the first direction D1. In the present embodiment, the second direction D2 is orthogonal to the first direction D1. In the following description, the side toward which the arrow of the