Liquid-cooled housing and on-board DC-DC converter

Abstract

This application discloses a liquid-cooled housing and an on-board DC-DC converter, relating to the field of automotive circuit technology. It aims to improve the heat dissipation and cooling effect of the on-board DC-DC converter. The liquid-cooled housing has a receiving cavity with an opening on one side along a first direction. Inside the liquid-cooled housing are a first flow channel, a second flow channel, and a third flow channel connected in sequence, with the first and third flow channels spaced apart along a second direction. The second flow channel extends along the second direction to connect the first and third flow channels, and also extends along the first direction. The first and second directions form an angle. This allows for rapid heat dissipation and cooling of the heat-generating components inside the liquid-cooled housing through liquid cooling and the planar structure of the second flow channel.

Description

Technical Field

[0001] This application relates to the field of automotive circuit technology, specifically to a liquid-cooled housing and an on-board DC-DC converter. Background Technology

[0002] To improve the range and charging speed of new energy vehicles, the voltage of their power batteries is getting higher and higher, such as 400V, 800V, or even 1000V power battery voltage systems.

[0003] However, onboard low-voltage equipment such as lighting, winches, oil pumps, water pumps, multimedia systems, control systems, and air circulation systems still require a low-voltage power supply system (such as 12V-48V) for power. Therefore, new energy vehicles use DC-DC converter modules to reduce the high-voltage DC power from the power battery to an appropriate low-voltage DC range to power the onboard low-voltage equipment.

[0004] Because the vehicle-mounted low-voltage equipment has a large overall power consumption and a low supply voltage, the DC-DC converter module has a large output current. This results in the DC-DC converter module, which has a high power density, generating a large amount of heat. Summary of the Invention

[0005] The purpose of this application is to provide a liquid-cooled housing and an on-board DC-DC converter to improve the heat dissipation and cooling effect of the on-board DC-DC converter.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] In a first aspect, some embodiments of this application provide a liquid-cooled housing, which has a receiving cavity with an opening on one side along a first direction. The liquid-cooled housing has a first flow channel, a second flow channel, and a third flow channel that are sequentially connected, with the first and third flow channels spaced apart along a second direction. The second flow channel extends along the second direction to connect the first and third flow channels, and also extends along the first direction. The first and second directions form an angle.

[0008] In some embodiments, the liquid cooler housing includes a main body, a first baffle, and a second baffle. The main body has a receiving cavity with an opening on one side along a first direction. The first baffle, located within the receiving cavity and connected to the main body, has a first flow channel inside. The second baffle, also located within the receiving cavity and connected to the main body, has a third flow channel inside. The first and second baffles are spaced apart along a second direction. Along a third direction, the ends of the first and second baffles facing the same direction are connected to a sidewall of the main body. Along the second direction, a second flow channel is provided inside the sidewall of the main body connecting the first and second baffles. The first, second, and third directions form an angle with each other.

[0009] In some embodiments, along the first direction, the end of the first flow channel near the opening is smaller in size in the second direction than the end of the first flow channel away from the opening.

[0010] In some implementations, the end of the third flow channel near the opening is smaller in the second direction than the end of the third flow channel away from the opening.

[0011] In some embodiments, the liquid cooler housing further includes a first liquid collecting chamber and a second liquid collecting chamber. Along a third direction, the end of the first flow channel furthest from the second flow channel communicates with the first liquid collecting chamber. The dimension of the first liquid collecting chamber along a second direction is larger than the dimension of the first flow channel. Along a third direction, the end of the third flow channel furthest from the second flow channel communicates with the second liquid collecting chamber. The dimension of the second liquid collecting chamber along the second direction is larger than the dimension of the third flow channel. The first flow channel and the third flow channel extend along the third direction, and the first direction, the second direction, and the third direction form an angle with each other.

[0012] In some embodiments, the liquid cooler housing is further provided with a first liquid inlet and a second liquid inlet, the first liquid inlet communicating with a first liquid collection chamber, and the second liquid inlet communicating with a second liquid collection chamber. Along a first direction, there is a height difference between the first liquid inlet and the second liquid inlet.

[0013] In some embodiments, along the first direction, the height dimension of the first liquid collection chamber is greater than the height dimension of the second liquid collection chamber, and the first liquid outlet is located on the side of the second liquid outlet closer to the opening.

[0014] In some embodiments, an inner rounded corner structure or an inner arc corner structure is provided between the inner wall of the first liquid collection chamber and the inner wall of the first flow channel.

[0015] In some embodiments, an inner rounded corner structure or an inner arc corner structure is provided between the inner wall of the second liquid collection chamber and the inner wall of the third flow channel.

[0016] In some embodiments, a fourth flow channel and a fifth flow channel are provided inside the bottom wall of the main body, which is positioned opposite the opening, along a first direction. The fourth and fifth flow channels are spaced apart along a second direction, with the fourth flow channel communicating with the first flow channel and the fifth flow channel communicating with the third flow channel.

[0017] In some embodiments, the liquid cooling housing also includes a packaging plate, which is located on the outer side of the main body away from the opening and is fixedly connected to the main body along a first direction. A fourth flow channel and a fifth flow channel are formed between the packaging plate and the main body.

[0018] Secondly, some embodiments of this application provide an on-board DC-DC converter, including the liquid-cooled housing mentioned in the previous aspect and at least one control circuit board, the control circuit board being in contact with and connected to the liquid-cooled housing within a receiving cavity.

[0019] Beneficial effects: By installing components such as control circuit boards within the housing of the liquid-cooled casing, the casing protects these components, thereby improving the stability of the on-board DC-DC converter. Furthermore, by incorporating sequentially connected first, second, and third flow channels within the liquid-cooled casing, coolant can flow through these channels to rapidly dissipate heat, enabling the casing to quickly cool and de-temperature the control circuit boards and other components.

[0020] Within the liquid-cooled housing, the second flow channel extends along a second direction to connect the first and third flow channels at both ends, and also extends along a first direction. This makes the second flow channel approximate a planar flow channel inside the liquid-cooled housing, thereby significantly increasing the heat dissipation contact area between the second flow channel and the liquid-cooled housing, which is beneficial for the rapid heat dissipation and cooling of the liquid-cooled housing.

[0021] Thus, rapidly cooling components such as the control circuit board through liquid cooling helps improve the overall power density of the vehicle-mounted DC-DC converter. This allows for a significant reduction in equipment size while maintaining a certain power output, or a substantial increase in rated power while maintaining a certain size, and enables the entire unit to operate stably within a suitable temperature range. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the disclosed drawings without creative effort.

[0023] Figure 1 An exploded view of an on-board DC-DC converter provided in an embodiment of this application;

[0024] Figure 2 for Figure 1 The liquid cooler housing shown is a cross-sectional view at the first flow channel;

[0025] Figure 3 for Figure 1 A cross-sectional view of the liquid cooling housing shown in the first direction;

[0026] Figure 4 for Figure 1 The liquid cooler housing shown is a cross-sectional view at the second flow channel;

[0027] Figure 5 for Figure 1 The liquid cooler housing shown is a cross-sectional view at the first liquid collection chamber.

[0028] Figure 6 for Figure 1 A three-dimensional structural schematic diagram of the liquid cooler housing shown in the figure;

[0029] Figure 7 A cross-sectional view of the first flow channel provided in an embodiment of this application, perpendicular to the second direction;

[0030] Figure 8 A three-dimensional structural schematic diagram of a cross-sectional view of the third flow channel provided in an embodiment of this application, perpendicular to the second direction;

[0031] Figure 9 for Figure 1 An exploded view of the liquid-cooled housing shown.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100. Vehicle-mounted DC-DC converter;

[0034] 10. Liquid cooling housing; 111. Receiving cavity; 112. Opening; 121. First flow channel; 122. Second flow channel; 123. Third flow channel; 124. First liquid collection chamber; 125. Second liquid collection chamber; 126. First liquid outlet; 127. Second liquid outlet; 128. Fourth flow channel; 129. Fifth flow channel; 131. Main body; 132. First baffle; 133. Second baffle; 134. Encapsulation plate;

[0035] 20. Control circuit board. Detailed Implementation

[0036] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0037] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] It should be noted that in practical applications, due to limitations in equipment precision or installation errors, achieving absolute parallelism or perpendicularity is difficult. The descriptions of perpendicularity, parallelism, or unidirectional orientation in this application are not absolute limitations, but rather indicate that a perpendicular or parallel structural arrangement can be achieved within a preset error range (e.g., a vertical deviation of 5°) to reach the corresponding preset effect. This maximizes the technical effect of the defined features and makes the corresponding technical solution easy to implement, demonstrating high feasibility.

[0039] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0042] This application discloses numerous different embodiments or examples for implementing various structures. To simplify the disclosure, specific examples of components and arrangements are described herein. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, this application provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0043] like Figure 1As shown, this application embodiment provides an on-board DC-DC converter 100, including a liquid-cooled housing 10 and at least one control circuit board 20. The liquid-cooled housing 10 has a receiving cavity 111 with an opening on one side along a first direction (i.e., the Z direction). This receiving cavity 111 is used to mount at least one or more components such as the control circuit board 20. The control circuit board 20 within the receiving cavity 111 is protected by the liquid-cooled housing 10, thereby improving the stability of the device.

[0044] Combination Figure 1 and Figure 2 Along the Z-direction, one end of the liquid-cooled housing 10 has an opening 112 that connects to the receiving cavity 111, so that one or more control circuit boards 20 can be installed in the receiving cavity 111 through the opening 112. If the control circuit board 20 is in contact with the liquid-cooled housing 10 in the receiving cavity 111, the control circuit board 20 can be rapidly cooled by the liquid-cooled housing 10.

[0045] In some embodiments, such as Figure 2 and Figure 3 As shown, the liquid cooler housing 10 has a first flow channel 121, a second flow channel 122 and a third flow channel 123 connected in sequence inside, and the first flow channel 121 and the third flow channel 123 are arranged at intervals along the second direction (i.e. the X direction).

[0046] Reference Figure 3 and Figure 4 The second flow channel 122 extends along the X direction to connect the first flow channel 121 and the third flow channel 123, and the second flow channel 122 extends along the Z direction. The second direction (i.e., the X direction) can be regarded as the length direction of the second flow channel 122, and the first direction (i.e., the Z direction) can be regarded as the height direction of the second flow channel 122. That is, the second flow channel 122 is a planar flow channel parallel to the X and Z directions.

[0047] In this context, the first direction (e.g., the Z direction), the second direction (e.g., the X direction), and the third direction are at angles to each other. That is, the angle between any two directions can be acute, right, or obtuse. For example, the first direction, the second direction, and the third direction can be perpendicular to each other.

[0048] Thus, by installing components such as the control circuit board 20 within the housing cavity 111 of the liquid-cooled housing 10, the liquid-cooled housing 10 can protect these components, thereby improving the stability of the vehicle-mounted DC-DC converter 100. Furthermore, by providing sequentially connected first flow channels 121, second flow channels 122, and third flow channels 123 inside the liquid-cooled housing 10, coolant can flow through these channels to quickly remove heat from the interior of the liquid-cooled housing 10, enabling rapid cooling of components such as the control circuit board 20.

[0049] Inside the liquid-cooled housing 10, the second flow channel 122 extends along the X direction to connect the first flow channel 121 and the third flow channel 123 at both ends, and also extends along the Z direction. This makes the second flow channel 122 approximately a planar flow channel inside the liquid-cooled housing 10, significantly increasing the heat dissipation contact area between the second flow channel 122 and the liquid-cooled housing 10. This allows the liquid-cooled housing 10 to dissipate heat, dissipating some of the heat absorbed in the coolant, improving the heat dissipation capacity of the third flow channel 123, and ultimately enabling the internal components to cool down more quickly.

[0050] In this way, rapid cooling of components such as the control circuit board 20 via liquid cooling helps to improve the overall power density of the vehicle-mounted DC-DC converter 100. This allows for a significant reduction in equipment size while maintaining a fixed power output, or a substantial increase in rated power while maintaining a fixed size, and enables the entire unit to operate stably within a suitable temperature range.

[0051] For example, such as Figure 2 and Figure 3 As shown, the liquid cooler housing 10 includes a main body 131, a first baffle 132, and a second baffle 133. The main body 131 has a receiving cavity 111 with an opening 112 on one side along the Z direction. That is, the main body 131 can be regarded as a box-shaped structure with an opening 112 on one side. The first baffle 132 is located inside the receiving cavity 111 and connected to the main body 131, and a first flow channel 121 is provided inside the first baffle 132. The second baffle 133 is located inside the receiving cavity 111 and connected to the main body 131, and a third flow channel 123 is provided inside the second baffle 133.

[0052] Combination Figure 3 The first baffle 132 and the second baffle 133 are spaced apart along the X direction to divide the receiving cavity 111 into multiple chambers. Along a third direction (such as the Y direction), the ends of the first baffle 132 and the second baffle 133 facing the same direction are connected to the side wall of the main body 131. Along the X direction, a second flow channel 122 is provided inside the side wall of the main body 131 connected between the first baffle 132 and the second baffle 133.

[0053] Among them, the third direction can be the length extension direction of the first flow channel 121 and the third flow channel 123.

[0054] That is, the second flow channel 122, which is a planar flow channel, can be provided in a part of the side wall of the main body 131 to increase the contact heat dissipation area between the heat dissipation flow channel and the main body 131, and to quickly dissipate heat and cool down the heat dissipation components in the receiving cavity 111 through the main body 131.

[0055] Within the receiving cavity 111, the first baffle 132 and the second baffle 133, which are spaced apart, can divide the receiving cavity 111 into multiple smaller chambers along the X direction, making it convenient to install different control circuit boards 20 and other heat dissipation components in different chamber spaces.

[0056] For example, since the first baffle 132 has a first flow channel 121 and the second baffle 133 has a third flow channel 123, and the first baffle 132 and the second baffle 133 are spaced apart along the X direction. Taking the X direction as the left-right direction as an example, within the receiving cavity 111, the left and right sides of the first baffle 132 can contact and install components such as control circuit boards, and the left and right sides of the second baffle 133 can also contact and install components such as control circuit boards. This allows control circuit boards 20 and other control circuit boards to be quickly cooled and dissipated by the coolant through the first baffle 132 and the second baffle 133, facilitating the installation of multiple control circuit boards 20 and other components in the separated multiple cavities.

[0057] Taking the length direction of the first flow channel 121 and the third flow channel 123 as an example (i.e., the Y direction), the extension plane of the second flow channel 122 is set approximately perpendicular to the third direction.

[0058] Alternatively, the extension plane of the second flow channel 122 is set approximately perpendicular to the length direction of the first flow channel 121.

[0059] In some embodiments, such as Figure 2 As shown, the first flow channel 121 and the third flow channel 123 are also extended along the Z direction.

[0060] That is, within the first baffle 132, the first flow channel 121 is a planar flow channel approximately perpendicular to the X direction. If the first flow channel 121 extends along the Y direction (where the first direction is the length direction of the first flow channel 121) and extends along the Z direction (where the first direction is the height direction of the first flow channel 121), then the first flow channel 121 is a planar flow channel within the first baffle 132. In this way, the coolant has a larger heat dissipation contact area with the first baffle 132 as it flows through the first flow channel 121, resulting in better heat dissipation.

[0061] Correspondingly, within the second baffle 133, the third flow channel 123 is a planar flow channel approximately perpendicular to the X direction. If the third flow channel 123 extends along the Y direction (the length direction of the first flow channel 121) and extends along the Z direction (the height direction of the first flow channel 121), then the third flow channel 123 is a planar flow channel within the second baffle 133. In this way, the coolant has a larger heat dissipation contact area with the second baffle 133 as it flows through the third flow channel 123, resulting in better heat dissipation.

[0062] Since the first direction is the height direction of the first flow channel 121, the second flow channel 122 and the third flow channel 123, taking the height direction as the up and down direction as an example.

[0063] Along the height direction, the upper end of the first flow channel 121 (i.e. the end near the opening 112) can be configured to have a smaller size in the X direction compared to its lower end.

[0064] That is, along the second direction, the size of the first flow channel 121 gradually increases from top to bottom. Specifically, the upper part of the first flow channel 121 has a smaller size, and the lower part has a larger size. For example, the size of the first flow channel 121 gradually increases from top to bottom from 2.5 mm to 4.2 mm.

[0065] Thus, with a constant coolant flow rate, the coolant has a faster flow rate in the upper part of the first flow channel 121 because the upper part of the first flow channel 121 has a smaller cross-sectional size. This means that the rapidly flowing and renewed coolant can always maintain a lower temperature, so as to absorb and carry away more heat in a timely manner, thereby improving the heat dissipation effect.

[0066] Correspondingly, along the height direction, the upper end of the second flow channel 122 can be configured to have a smaller dimension in the X direction compared to its lower end.

[0067] For example, along the second direction, the dimensions of the second flow channel 122 gradually increase from top to bottom. That is, the upper dimension of the second flow channel 122 is smaller, and the lower dimension of the second flow channel 122 is larger. For example, the dimension of the second flow channel 122 gradually increases from top to bottom from 2.5 mm to 4.2 mm.

[0068] Thus, with a constant coolant flow rate, the coolant has a faster flow rate in the upper part of the second flow channel 122 because the upper part of the second flow channel 122 has a smaller cross-sectional size. This means that the rapidly flowing and renewed coolant can always maintain a lower temperature, so as to absorb and carry away more heat in time, thereby improving the heat dissipation effect.

[0069] In addition, along the height direction, the upper end of the third flow channel 123 can be configured to have a smaller dimension in the X direction compared to its lower end.

[0070] For example, along the second direction, the dimensions of the third flow channel 123 gradually increase from top to bottom. That is, the upper dimension of the third flow channel 123 is smaller, and the lower dimension of the third flow channel 123 is larger. For example, the dimension of the third flow channel 123 gradually increases from top to bottom from 2.5 mm to 4.2 mm.

[0071] Thus, with a constant coolant flow rate, the coolant has a faster flow rate in the upper part of the third flow channel 123 because the upper part of the third flow channel 123 has a smaller cross-sectional size. This means that the rapidly flowing and renewed coolant can always maintain a lower temperature, so as to absorb and carry away more heat in time, thereby improving the heat dissipation effect.

[0072] It should be noted that, in the embodiments of this application, the first direction (such as the Z direction), the second direction (such as the X direction), and the third direction (such as the Z direction) can be set perpendicular to each other. Alternatively, the included angle between any two of the above three directions can be set to an acute angle or an obtuse angle, and there is no limitation thereto.

[0073] In some embodiments, refer to Figure 3 and Figure 5 The liquid cooler housing 10 also includes a first liquid collecting chamber 124 and a second liquid collecting chamber 125. Along the length of the first flow channel 121 (e.g., the Y-direction), the end of the first flow channel 121 furthest from the second flow channel 122 communicates with the first liquid collecting chamber 124. The dimension of the first liquid collecting chamber 124 along the X-direction is larger than the dimension of the first flow channel 121. Along the length of the third flow channel 123 (e.g., the Y-direction), the end of the third flow channel 123 furthest from the second flow channel 122 communicates with the second liquid collecting chamber 125. The dimension of the second liquid collecting chamber 125 along the X-direction is larger than the dimension of the third flow channel 123.

[0074] Taking the first liquid collection chamber 124 as the liquid inlet side and the second liquid collection chamber 125 as the liquid outlet side as an example, the first liquid collection chamber 124, which has a larger internal size, allows the coolant to be fully mixed in the first liquid collection chamber 124 before entering the first flow channel 121, thereby reducing or avoiding the flow of locally hot coolant into the first flow channel 121 and affecting the heat dissipation and cooling effect.

[0075] By setting a second liquid collection chamber 125 with a larger internal size, the coolant is fully mixed and discharged after entering the second liquid collection chamber 125 through the third flow channel 123, thereby reducing or avoiding the occurrence of local fluid temperatures that are too low or too high. This allows the coolant that has absorbed heat to be distributed more evenly, thus preventing the outflow of coolant with a low local temperature from reducing the heat dissipation (or heat exchange) effect of that part of the coolant on the outside.

[0076] Thus, by setting the first liquid collection chamber 124 and the second liquid collection chamber 125 with larger internal dimensions, the coolant can be uniformly mixed in the corresponding first liquid collection chamber 124 and second liquid collection chamber 125 before entering the first flow channel 121 and after flowing out of the third flow channel 123, thereby improving the liquid cooling heat dissipation effect of the whole machine.

[0077] Based on this, such as Figure 3 and Figure 6 As shown, the liquid cooler housing 10 also includes a first liquid inlet 126 and a second liquid inlet 127. Combined with... Figure 7 The first liquid outlet 126 is connected to the first liquid collection chamber 124. For example... Figure 8 As shown, the second liquid port 127 is connected to the second liquid collection chamber 125. Furthermore, there is a height difference between the first liquid port 126 and the second liquid port 127 along the Z direction.

[0078] Taking the example where the first liquid inlet 126 is the liquid inlet and the second liquid outlet 127 is the liquid outlet, as the coolant flows from the first liquid inlet 126 sequentially along the first liquid collection chamber 124, the first flow channel 121, the second flow channel 122, the third flow channel 123, and the second liquid collection chamber 125 to the second liquid inlet 127, there is a height difference between the first liquid inlet 126 and the second liquid outlet 127 in the Z direction. This creates a drop in the coolant as it flows in and out along the aforementioned channels, which helps to improve the uniformity of coolant mixing within the second liquid collection chamber 125.

[0079] For example, such as Figure 5 As shown, along the Z direction, the height dimension of the first liquid collection chamber 124 is greater than the height dimension of the second liquid collection chamber 125. Figure 6 The first liquid outlet 126 is located on the side of the second liquid outlet 127 near the opening 112.

[0080] Taking the opening 112 located on the upper side of the liquid cooler housing 10 as an example, the first liquid inlet 126 is located above the second liquid inlet 127, and the two are spaced apart along the Z direction. Because the first liquid inlet 126 is positioned higher, and the internal dimensions of the first flow channel 121 at its upper end are smaller, the coolant has a faster flow velocity in the upper parts of the first flow channel 121, the second flow channel 122, and the third flow channel 123, thereby achieving rapid heat absorption and cooling of the coolant. During the process of the coolant entering the second liquid collection chamber 125, because the second liquid inlet 127 is positioned lower, the rapidly flowing coolant will impact and flow downwards in the second liquid collection chamber 125, so that the coolant in the second liquid collection chamber 125 can achieve a better degree of mixing and uniformity.

[0081] Along the Z-direction, the height of the first liquid collection chamber 124 is less than or equal to the height of the first flow channel 121. For example, the height of the first liquid collection chamber 124 is the same as the height of the first flow channel 121, or the height of the first liquid collection chamber 124 is slightly lower than the height of the first flow channel 121.

[0082] For example, the height difference between the first liquid collection chamber 124 and the first flow channel 121 can be set to be less than or equal to 20mm. This allows the coolant, after being uniformly mixed in the first liquid collection chamber 124, to flow more evenly into the first flow channel 121 along the Z direction, thereby improving the heat dissipation effect on components such as the control circuit board in the receiving cavity 111.

[0083] like Figure 8 As shown, along the Z direction, the ratio of the height dimension H1 of the second liquid collecting cavity 125 to the height dimension H2 of the third flow channel 123 ranges from 1 / 3 to 2 / 3. That is, the height dimension of the second liquid collecting cavity 125 is greater than or equal to 1 / 3 of the height dimension of the third flow channel 123, and the height dimension of the second liquid collecting cavity 125 is less than or equal to 2 / 3 of the height dimension of the third flow channel 123.

[0084] In this way, the second liquid inlet 127, which communicates with the second liquid collection chamber 125, can be installed at a lower position, so that the coolant flowing from the upper part of the third flow channel 123 has a larger inclination angle as it flows into the second liquid collection chamber 125, that is, the coolant flowing into the second liquid collection chamber 125 has a larger downward inclination angle. This allows the coolant in the upper and lower parts of the first flow channel 121, the second flow channel 122, and the third flow channel 123 to be fully mixed in the second liquid collection chamber 125, thereby improving the overall liquid cooling heat dissipation effect of the machine.

[0085] For example, the inner wall of the first liquid collection chamber 124 and the inner wall of the first flow channel 121 are provided with an inner rounded corner structure or an inner arc corner structure. Taking the X direction as the left-right direction as an example. Figure 3 As shown, since the first liquid collection chamber 124 has a large internal size along the X direction, the left and right inner walls of the first liquid collection chamber 124 and the left and right inner walls of the first flow channel 121 can be smoothly connected and transitioned through an inner rounded corner structure or an inner arc corner structure. This reduces the flow resistance and flow noise of the coolant while improving the flow speed of the coolant.

[0086] Combination Figure 5 and Figure 7 Since the height of the first liquid collection chamber 124 is smaller than the height of the first flow channel 121, an inner rounded corner structure or an inner arc corner structure can also be provided between the upper inner wall of the first liquid collection chamber 124 and the upper inner wall of the first flow channel 121 to make a smooth transition between the two, so that the coolant entering the first flow channel 121 has lower flow resistance and noise, and is conducive to increasing the flow velocity of the coolant in the upper part of the first flow channel 121.

[0087] Alternatively, an inner rounded corner structure or an inner arc corner structure can be provided between the inner wall of the second liquid collection chamber 125 and the inner wall of the third flow channel 123. For example... Figure 3 As shown, since the second liquid collection chamber 125 has a large internal size along the X direction, the left and right inner walls of the second liquid collection chamber 125 and the left and right inner walls of the third flow channel 123 can be smoothly connected and transitioned through an inner rounded corner structure or an inner arc corner structure. This reduces the flow resistance and flow noise of the coolant while improving the flow speed of the coolant.

[0088] Combination Figure 5 and Figure 8 Since the height of the second liquid collection chamber 125 is smaller than that of the third flow channel 123, an inner rounded corner structure or an inner arc corner structure can be simultaneously provided between the upper inner wall of the second liquid collection chamber 125 and the upper inner wall of the third flow channel 123 to ensure a smooth transition between them. In this way, as the coolant enters the second liquid collection chamber 125 from the upper part of the third flow channel 123, it can flow downwards rapidly, resulting in lower resistance to the coolant on the smoothly connected upper inner wall, which helps improve the uniformity of coolant mixing within the second liquid collection chamber 125.

[0089] In some embodiments, such as Figure 2 As shown, along the Z-direction, the bottom wall of the main body 131, which is positioned opposite the opening 112, is provided with a fourth flow channel 128 and a fifth flow channel 129. The fourth flow channel 128 and the fifth flow channel 129 are distributed at intervals along the X-direction. The fourth flow channel 128 is connected to the first flow channel 121, and the fifth flow channel 129 is connected to the third flow channel 123.

[0090] Thus, by providing a fourth flow channel 128 and a fifth flow channel 129 in the bottom wall of the main body 131, some of the coolant can flow in the fourth flow channel 128 and the fifth flow channel 129, thereby increasing the contact area between the coolant and the main body 131, which is beneficial to improving the cooling and heat dissipation effect of the whole machine.

[0091] Based on this, such as Figure 9 As shown, the liquid cooling housing 10 also includes a packaging plate 134. Along the Z direction, the packaging plate 134 is located on the outside of the main body 131 away from the opening 112 and is fixedly connected to the main body 131 by means of welding, for example. A fourth flow channel 128 and a fifth flow channel 129 are formed between the packaging plate 134 and the main body 131.

[0092] Thus, the fourth flow channel 128, the fifth flow channel 129, the first flow channel 121, the second flow channel 122, the third flow channel 123, the first liquid collection chamber 124, and the second liquid collection chamber 125 can be machined from bottom to top on the bottom wall of the main body 131. Then, a liquid cooling channel including the first liquid outlet 126 and the second liquid outlet 127 is formed by sealing the encapsulation plate 134 and the main body 131. That is, the main body 131, the first baffle 132, and the second baffle 133 can be integrally formed to ensure good airtightness of the liquid cooling channel.

[0093] In practical applications, the vehicle-mounted DC-DC converter 100 of this application embodiment can install at least one or more control circuit boards and other components within the receiving cavity 111 of the liquid-cooled housing 10. By arranging the control circuit boards and other components in contact with the liquid-cooled housing 10 within the receiving cavity 111, the coolant in the liquid-cooled channel can absorb heat from the control circuit boards and other components through the liquid-cooled housing 10, thereby maintaining the control circuit boards and other components within a suitable operating temperature range. The narrow-at-the-top and wide-at-the-bottom configuration of the liquid-cooled channel helps to increase the flow rate of the coolant in the upper region of the liquid-cooled channel, while the arrangement of the first liquid collecting chamber 124 and the second liquid collecting chamber 125 helps to improve the uniformity of coolant mixing during inflow and outflow from the liquid-cooled channel, thus improving the overall heat dissipation and cooling effect of the device.

[0094] In the description of this specification, the terms "implementation," "example," "some embodiments," "example," "exemplary," "for instance," etc., refer to specific features, structures, shapes, positions, materials, or characteristics described in connection with an implementation or example that are included in at least one implementation or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same implementation or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more implementations or examples.

[0095] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A liquid cooling housing, wherein the liquid cooling housing is provided with a receiving cavity (111), and the receiving cavity (111) is provided with an opening (112) on one side along a first direction, characterized in that: The liquid cooler housing is provided with a first flow channel (121), a second flow channel (122) and a third flow channel (123) connected in sequence, and the first flow channel (121) and the third flow channel (123) are spaced apart along a second direction; The second flow channel (122) extends along the second direction to connect the first flow channel (121) and the third flow channel (123), and the second flow channel (122) extends along the first direction, with the first direction and the second direction having an angle.

2. The liquid-cooled enclosure of claim 1, wherein, The liquid cooler housing includes: The main body (131) has a receiving cavity (111) with an opening (112) on one side along the first direction. A first baffle (132) is located within the receiving cavity (111) and connected to the main body (131). The first baffle (132) has a first flow channel (121) inside it. The second baffle (133) is located inside the receiving cavity (111) and connected to the main body (131). The third flow channel (123) is provided inside the second baffle (133). The first baffle (132) and the second baffle (133) are spaced apart along the second direction; along the third direction, the ends of the first baffle (132) and the second baffle (133) facing the same direction are connected to the side wall of the main body (131); along the second direction, the main body (131) is provided with a second flow channel (122) inside the side wall between the first baffle (132) and the second baffle (133). The first direction, the second direction, and the third direction are at angles to each other.

3. The liquid-cooled enclosure of claim 1, wherein, Along the first direction, the end of the first flow channel (121) near the opening (112) is smaller in the second direction than the end of the first flow channel (121) away from the opening (112); and / or, Along the first direction, the end of the third flow channel (123) near the opening (112) is smaller in the second direction than the end of the third flow channel (123) away from the opening (112).

4. The liquid-cooled enclosure of any of claims 1-3, wherein, The liquid cooler housing is also provided with a first liquid collection chamber (124) and a second liquid collection chamber (125). Along the third direction, the end of the first flow channel (121) away from the second flow channel (122) is connected to the first liquid collection chamber (124); the size of the first liquid collection chamber (124) along the second direction is larger than the size of the first flow channel (121); Along the third direction, the end of the third flow channel (123) away from the second flow channel (122) is connected to the second liquid collection chamber (125); the dimension of the second liquid collection chamber (125) along the second direction is larger than the dimension of the third flow channel (123); The first flow channel (121) and the third flow channel (123) are arranged to extend along the third direction, and the first direction, the second direction and the third direction have an angle between each other.

5. The liquid-cooled enclosure of claim 4, wherein, The liquid cooler housing is also provided with a first liquid port (126) and a second liquid port (127), the first liquid port (126) being connected to the first liquid collection chamber (124), and the second liquid port (127) being connected to the second liquid collection chamber (125); Along the first direction, there is a height difference between the first liquid outlet (126) and the second liquid outlet (127).

6. The liquid-cooled enclosure of claim 5, wherein, Along the first direction, the height dimension of the first liquid collection chamber (124) is greater than the height dimension of the second liquid collection chamber (125), and the first liquid outlet (126) is located on the side of the second liquid outlet (127) near the opening (112).

7. The liquid-cooled enclosure of claim 4, wherein, The inner wall of the first liquid collection chamber (124) and the inner wall of the first flow channel (121) are provided with an inner rounded corner structure or an inner arc corner structure; and / or, The inner wall of the second liquid collection chamber (125) and the inner wall of the third flow channel (123) are provided with an inner rounded corner structure or an inner arc corner structure.

8. The liquid-cooled enclosure of claim 2, wherein, Along the first direction, the bottom wall of the main body (131) and the opening (112) is provided with a fourth flow channel (128) and a fifth flow channel (129). The fourth flow channel (128) and the fifth flow channel (129) are spaced apart along the second direction; the fourth flow channel (128) is connected to the first flow channel (121), and the fifth flow channel (129) is connected to the third flow channel (123).

9. The liquid-cooled enclosure of claim 8, wherein, The liquid cooling housing also includes: The encapsulation plate (134) is located on the outside of the main body (131) away from the opening (112) along the first direction and is fixedly connected to the main body (131); The fourth flow channel (128) and the fifth flow channel (129) are formed between the encapsulation plate (134) and the main body (131).

10. An on-board DC converter, characterized by include: Liquid-cooled housing as described in any one of claims 1-9; as well as At least one control circuit board (20) is connected in contact with the liquid cooler housing within the receiving cavity (111).

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