US-12621966-B2 - Heat dissipation structure and vehicle charging device

US12621966B2US 12621966 B2US12621966 B2US 12621966B2US-12621966-B2

Abstract

A heat dissipation structure, for cooling a vehicle charging device, is provided and includes a cover body, a housing and a flow channel structure. The housing includes a bottom wall, an inlet end and an outlet end. The cover body is hermetically sealed to the bottom wall of the housing. The inlet end and the outlet end are respectively disposed on at least one sidewall of the housing. The flow channel structure is disposed in the housing and includes a first channel and at least one second channel communicating with each other. The inlet end communicates with the first channel. The outlet end communicates with the at least one second channel. The first channel is formed between the bottom wall of the housing and the cover body, and the at least one second channel rises from the first channel. A vehicle charging device is also provided.

Inventors

Muhammad Azhar Abdul Gafar
Peng Gao

Assignees

LITE-ON SINGAPORE PTE LTD

Dates

Publication Date: 20260505
Application Date: 20240121
Priority Date: 20230825

Claims (20)

1 . A heat dissipation structure, for cooling a vehicle charging device, comprising: a cover body; a housing, comprising a bottom wall, an inlet end and an outlet end, wherein the cover body is hermetically sealed to the bottom wall of the housing, and the inlet end and the outlet end are respectively disposed on at least one sidewall of the housing; and a flow channel structure, disposed in the housing and comprising a first channel and at least one second channel communicating with the first channel, wherein the inlet end communicates with the first channel, the outlet end communicates with the at least one second channel, the first channel is formed between the bottom wall of the housing and the cover body, and the at least one second channel rises from the first channel, wherein the flow channel structure further includes a communicating space, the at least one second channel includes two second channels, and the communicating space is directly connected to all of the two second channels and the outlet end.
2 . The heat dissipation structure according to claim 1 , wherein a cooling fluid is adapted to flow into the housing from the inlet end, pass through the first channel and the at least one second channel in sequence, and flow out of the housing from the outlet end.
3 . The heat dissipation structure according to claim 1 , wherein the housing further comprises at least two inner sidewalls opposite to each other, the at least two inner sidewalls are disposed nearly vertically on the bottom wall, and the at least one second channel is formed between the at least two inner sidewalls.
4 . The heat dissipation structure according to claim 1 , wherein a depth of the communicating space in a direction perpendicular to the bottom wall is greater than a depth of the first channel in the direction.
5 . The heat dissipation structure according to claim 1 , further comprising at least one flow guiding element, wherein the at least one flow guiding element is arc-shaped, disposed on the bottom wall of the housing and located in the first channel.
6 . The heat dissipation structure according to claim 5 , wherein a gap is formed between the cover body and the at least one flow guiding element.
7 . The heat dissipation structure according to claim 1 , further comprising a plurality of protruding portions, wherein the protruding portions protrude from the bottom wall of the housing and are located in the first channel.
8 . The heat dissipation structure according to claim 1 , wherein the inlet end and the outlet end are located on the same side of the housing.
9 . The heat dissipation structure according to claim 1 , wherein a width of the at least one second channel is between 4 mm and 5 mm, and a height of the at least one second channel is between 40 mm and 60 mm.
10 . A vehicle charging device, comprising: a heat dissipation structure, comprising: a cover body; a housing, comprising a bottom wall, an inlet end and an outlet end, wherein the cover body is hermetically sealed to the bottom wall of the housing, and the inlet end and the outlet end are respectively disposed on at least one sidewall of the housing; and a flow channel structure, disposed in the housing and comprising a first channel and at least one second channel communicating with each other, wherein the inlet end communicates with the first channel, the outlet end communicates with the at least one second channel, the first channel is formed between the bottom wall of the housing and the cover body, and the at least one second channel rises from the first channel; and at least one heating element, disposed in the housing, wherein a cooling fluid is adapted to flow through the flow channel structure to dissipate heat from the at least one heating element, wherein the flow channel structure further includes a communicating space, the at least one second channel includes two second channels, the communicating space communicates the two second channels and the outlet end, and the first channel is directly connected to both of the two second channels.
11 . The vehicle charging device according to claim 10 , wherein the cooling fluid is adapted to flow into the housing from the inlet end, pass through the first channel and the at least one second channel in sequence, and flow out of the housing from the outlet end.
12 . The vehicle charging device according to claim 10 , further comprising an inner sidewall and a board nearly perpendicular to the bottom wall, wherein the at least one heating element is an active electronic component and is configured on the board, the board is connected to the inner sidewall, the inner sidewall is disposed nearly vertically on the bottom wall, and the at least one heating element is thermally coupled to the at least one second channel through the board and the inner sidewall.
13 . The vehicle charging device according to claim 10 , further comprising a board parallel to or nearly perpendicular to the bottom wall, wherein the at least one heating element is a passive electronic component configured on the board, the board is disposed in the housing, the at least one heating element contacts the bottom wall and is thermally coupled to the first channel.
14 . The vehicle charging device according to claim 10 , wherein the housing further comprises at least two inner sidewalls opposite to each other, the at least two inner sidewalls are disposed nearly vertically on the bottom wall, and the at least one second channel is formed between the at least two inner sidewalls.
15 . The vehicle charging device according to claim 10 , wherein a depth of the communicating space in a direction perpendicular to the bottom wall is greater than a depth of the first channel in the direction.
16 . The vehicle charging device according to claim 10 , further comprising at least one flow guiding element, wherein the at least one flow guiding element is arc-shaped, disposed on the bottom wall of the housing and located in the first channel.
17 . The vehicle charging device according to claim 16 , wherein a gap is formed between the cover body and the at least one flow guiding element.
18 . The vehicle charging device according to claim 10 , further comprising a plurality of protruding portions, wherein the protruding portions protrude from the bottom wall of the housing and are located in the first channel.
19 . The vehicle charging device according to claim 10 , wherein the inlet end and the outlet end are located on the same side of the housing.
20 . The vehicle charging device according to claim 10 , wherein a width of the at least one second channel is between 4 mm and 5 mm, and a height of the at least one second channel is between 40 mm and 60 mm.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims the priority benefit of China application serial no. 202311081802.5, filed on Aug. 25, 2023. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. BACKGROUND Technical Field The invention relates to a heat dissipation structure and a charging device, and in particular to a liquid-cooling heat dissipation structure and a vehicle charging device. Description of Related Art On-board chargers (OBC) with high power density have become a trend in the automotive electronics market. High-power electronic devices such as DC or AC on-board chargers have complex circuits and structures, so their heat dissipation is demanding; thus, how to enhance the performance of heat dissipation for such devices has become a major challenge. In more detail, a heat source in an on-board charger is generally disposed on a horizontal board or a vertical board to achieve a compact design and high power density. Heat dissipation in such design is demanding and thus requires highly efficient approaches for heat dissipation. One of the most efficient approaches for heat dissipation is liquid cooling. In most of the current liquid-cooling heat dissipation designs, the heat source is usually mounted on a single cooling plate, and the heat generated by the heat source is taken away by a cooling liquid through the two-dimensional cooling channel in the cooling plate to realize heat dissipation. For example, CN 213585212U discloses a high power density on-board charger with a cooling plate. However, the cooling channel in the cooling plate is two-dimensional, with limited heat dissipation performance. Furthermore, the cooling liquid inlet and the cooling liquid outlet of the cooling plate are disposed opposite to each other so that the cooling liquid flows from one side of the housing, completely passes through the region targeted for heat dissipation, and then flows out from the opposite side of the housing. If the cooling liquid inlet and the cooling liquid outlet were disposed on the same side of the housing, the cooling liquid would not be able to completely cover the region targeted for heat dissipation, and in fact, on-board chargers are often required to have the cooling liquid inlet and the cooling liquid outlet disposed on the same side of the on-board charger. Therefore, such design is not suitable for on-board chargers. As such, developing a liquid-cooling channel design that better dissipates heat of high-power-density electronic devices is a major focus of current research. SUMMARY The invention provides a heat dissipation structure, which may provide good heat dissipation and effectively save space. The invention provides a vehicle charging device, which has the heat dissipation structure. A heat dissipation structure for cooling a vehicle charging device according to an embodiment of the invention includes a cover body, a housing and a flow channel structure. The housing includes a bottom wall, an inlet end and an outlet end. The cover body is hermetically sealed to the bottom wall of the housing. The inlet end and the outlet end are respectively disposed on at least one sidewall of the housing. The flow channel structure is disposed in the housing and includes a first channel and at least one second channel communicating with each other. The inlet end communicates with the first channel. The outlet end communicates with at least one second channel. The first channel is formed between the bottom wall of the housing and the cover body. The at least one second channel rises from the first channel. According to an embodiment of the invention, a cooling fluid is adapted to flow into the housing from the inlet end, pass through the first channel and the at least one second channel in sequence, and flow out of the housing from the outlet end. According to an embodiment of the invention, the housing further includes at least two inner sidewalls opposite to each other. The at least two inner sidewalls are disposed nearly vertically on the bottom wall. The at least one second channel is formed between the at least two inner sidewalls. According to an embodiment of the invention, the flow channel structure further includes a communicating space. The at least one second channel includes two second channels, the communicating space communicates between the two second channels and the outlet end, and a depth of the communicating space in a direction perpendicular to the bottom wall is greater than a depth of the first channel in the direction. According to an embodiment of the invention, the heat dissipation structure further includes at least one flow guiding element. The at least one flow guiding element is arc-shaped, disposed on the bottom wall of the housing and located in the first channel. According to an embodiment of the invention, a gap is formed between the cover body and the at least on