Heatsink Assembly

Abstract

In one example, the disclosed heat sink assembly includes a first heat sink and a second heat sink, each having a plurality of ribs integrally formed by extrusion molding along its internal longitudinal direction, the spaces between the ribs forming flow paths for a refrigerant, first and second faces open at both longitudinal ends, and a communication port on one side wall adjacent to the second face, the first and second heat sinks being integrated by the side walls forming a joining surface so that the communication ports coincide, the ribs of the first and second heat sinks having a length such that both ends of the ribs are spaced a predetermined distance from the first and second faces, and the open first and second faces at both ends of the first and second heat sinks being closed by end plugs inserted so as to be spaced apart from the ends of the ribs.

Description

[Technical Field]

[0001] The present invention relates to a heat sink assembly that is attached to the bottom of a battery pack that includes a plurality of secondary batteries and promotes heat dissipation from the battery pack.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0071921, dated June 2, 2023, and all contents disclosed in the documents of said Korean patent application are incorporated herein by reference. [Background technology]

[0003] Unlike primary batteries, secondary batteries are rechargeable and have the potential to be small and have large capacities, and as such, they have been the subject of much research and development in recent years. Demand for secondary batteries as an energy source is rapidly increasing due to the increasing technological development and demand for mobile devices, as well as the emergence of electric vehicles and energy storage systems in response to modern demands for environmental protection.

[0004] Secondary batteries are classified into coin-type batteries, cylindrical batteries, prismatic batteries, and pouch-type batteries depending on the shape of the battery case. The electrode assembly installed inside the battery case of a secondary battery is a power generating element that can be charged and discharged and is made up of a laminated structure of electrodes and a separator.

[0005] Since secondary batteries are required to be used continuously for a long period of time, it is necessary to effectively control the heat generated during the charging and discharging process.If secondary batteries are not cooled smoothly, a positive feedback chain reaction will occur in which a rise in temperature causes an increase in current, and the increase in current causes another rise in temperature, ultimately leading to a catastrophic state of thermal runaway.

[0006] Heat sinks (also called cooling plates) through which a refrigerant flows are widely used to effectively dissipate heat generated by secondary batteries. Heat sinks are attached to the bottom of a group of multiple secondary batteries, such as a battery pack containing multiple secondary batteries, and perform a cooling function by absorbing heat generated inside the pack with a refrigerant and dissipating it to the outside.

[0007] Heat sinks can be divided into brazed and extruded heat sinks depending on their structure or manufacturing method. Brazed heat sinks are made by brazing two plates together to form flow channels, which allows for greater freedom in flow channel design, but has the disadvantage of reduced structural rigidity due to the deterioration of the material's physical properties. In contrast, extruded heat sinks, which are manufactured as a continuous body through extrusion molding, have the advantage of structural rigidity, but can only implement linear flow channels, resulting in many ports and the need for connecting pipes that take up space. Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention aims to provide a heat sink assembly that is an extruded heat sink but does not require a separate pipe for forming a flow path, occupies less space, and has a simplified flow path configuration that reduces the number of parts, thereby improving differential pressure.

[0009] However, the technical problems that the present invention aims to solve are not limited to the above-mentioned problems, and other problems not mentioned will be clearly understood by those skilled in the art from the description of the invention described below. [Means for solving the problem]

[0010] The present invention relates to a heat sink assembly, which in one example includes first and second heat sinks each having a plurality of ribs integrally formed by extrusion molding along its internal longitudinal direction, the spaces between the ribs forming flow paths for a refrigerant, first and second faces open at both longitudinal ends, and a communication port on one side wall adjacent to the second face, the first and second heat sinks being integrated by the side walls forming a joining surface so that the communication ports coincide, the ribs of the first and second heat sinks having a length such that both ends of the ribs are spaced a predetermined distance from the first and second faces, and the open first and second faces at both ends of the first and second heat sinks being closed by end plugs inserted so as to be spaced apart from the ends of the ribs.

[0011] In one embodiment of the present invention, the first and second surfaces of the first and second heat sinks are each closed with an end plug, and cutouts corresponding to the depth at which the end plugs are inserted can be formed at both ends of the side walls of the upper first and second heat sinks that form the joining surfaces.

[0012] One of the first heat sink and the second heat sink has an inlet port communicating with the flow path, and the other heat sink has an outlet port communicating with the flow path.

[0013] The inlet and outlet ports may be located in a space between an end plug and a rib on the first surface.

[0014] The inlet port and the outlet port may be positioned diagonally relative to the communication port.

[0015] The ribs of the first heat sink and the second heat sink can be configured so that one end on the first surface side moves farther away from the first surface as it approaches the joining surface, and the other end on the second surface side moves closer to the second surface as it approaches the joining surface.

[0016] Meanwhile, in some embodiments of the present invention, a pair of first and second heat sink modules may be provided, which are integrated by forming a joint surface with the side walls so that the communication ports coincide, and the outlet port provided in one module may be connected to the inlet port provided in the other module by a pipe member.

[0017] The heat sink assembly of the present invention further includes a third heat sink, the second heat sink having another communication port on the side wall adjacent to the first surface, a plurality of ribs integrally formed along the internal longitudinal direction by extrusion molding, the spaces between the ribs forming flow paths for the refrigerant, first and second surfaces at both longitudinal ends being open, and the third heat sink having a communication port on one of the side walls adjacent to the first surface, the second and third heat sinks being integrated by the side walls forming a joining surface so that the communication ports coincide, the ribs of the third heat sink having a length such that both ends of the rib are separated by a predetermined distance from the first and second surfaces, and the open first and second surfaces at both ends of the third heat sink can be closed by end plugs inserted so as to be spaced apart from the ends of the ribs.

[0018] The first and second surfaces of the first, second and third heat sinks are each closed with an end plug, and cutouts corresponding to the depth at which the end plugs are inserted may be formed at both ends of the side walls forming the joining surfaces of the first, second and third heat sinks.

[0019] One of the first heat sink and the third heat sink may have an inlet port communicating with the flow path, and the other heat sink may have an outlet port communicating with the flow path.

[0020] Either the inlet port or the outlet port may be located in the space between the end plug and the rib on the first surface, and the other port may be located in the space between the end plug and the rib on the second surface.

[0021] According to one embodiment of the present invention, the inlet port and the outlet port may be positioned diagonally relative to the communication port that is most adjacent to the upstream side in the flow direction of the refrigerant.

[0022] In the heat sink assembly of the present invention, the Nth heat sink (where N is a natural number of 3 or more) and the (N+1)th heat sink are joined together to form an integrated unit, with the communication holes formed on one side walls coinciding with each other, and the open first and second surfaces at both ends of the (N+1)th heat sink can be continuously expanded by closing them with end plugs inserted so as to be spaced apart from the ends of the ribs formed along the internal longitudinal direction. [Effects of the Invention]

[0023] The heat sink assembly of the present invention having the above-described configuration has excellent structural rigidity because the heat sink is manufactured as a continuous body by extrusion molding. At the same time, the longitudinal ends and side walls of the ribs formed integrally with the heat sink are machined to form internal flow passages between the interconnected heat sinks, and the end plugs close the open surfaces, thereby forming cooling passages divided into inlets and outlets.

[0024] As a result, the heat sink assembly of the present invention is based on an extruded heat sink, which has the advantage of structural rigidity, but does not require a separate pipe for forming a flow path, occupies less space, and the simplified flow path configuration reduces the number of parts, thereby improving differential pressure.In addition, the heat dissipation area can be easily expanded by increasing the number of heat sinks to be joined.

[0025] However, the technical effects that can be obtained by the present invention are not limited to the effects described above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0026] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention described below, serve to further understand the technical concept of the present invention, and therefore the present invention should not be interpreted as being limited solely to the matters depicted in such drawings. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a view showing a heat sink assembly according to an embodiment of the present invention; [Figure 2] FIG. 2 is an exploded perspective view of the heat sink assembly. [Figure 3] FIG. 2 is a detailed view of part “A” in FIG. 1. [Figure 4] FIG. 2 is a detailed view of part “B” in FIG. 1. [Figure 5] 2 is a view showing the overall rib structure of the heat sink assembly of FIG. 1; [Figure 6] 10 is a view showing an embodiment of a heat sink assembly to which a third heat sink is added; [Figure 7] 1 is a diagram illustrating an example of a heat sink assembly including four heat sinks. [Figure 8] 1 is a diagram showing the flow of a coolant in a heat sink assembly including two heat sinks. [Figure 9] 9 is a view showing an embodiment in which the heat sink assembly of FIG. 8 is bonded to both sides of a pack center frame. [Figure 10] 9 is a view showing an embodiment in which the heat sink assembly of FIG. 8 is bonded to both sides of a pack center frame. [Figure 11] 7 is a diagram showing the flow of a coolant through the heat sink assembly of FIG. 6 in which three heat sinks are joined together in series. [Figure 12] 8 is a diagram showing the flow of a refrigerant for the heat sink assembly of FIG. 7 in which four heat sinks are joined in series. DETAILED DESCRIPTION OF THE INVENTION

[0028] Because the present invention can be modified in various ways and can have various embodiments, specific embodiments will be described in detail below.

[0029] However, this is not intended to limit the invention to any particular embodiment, but rather to be understood as including all modifications, equivalents, or alternatives falling within the spirit and scope of the invention.

[0030] In the present invention, terms such as "comprise" and "have" are intended to specify the presence of features, numbers, steps, operations, components, parts or combinations thereof described in the specification, and may be understood as not precluding the presence or additional possibility of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0031] Furthermore, in the present invention, when a layer, film, region, plate, or other portion is described as being "on" another portion, this includes not only the case where it is "directly on" the other portion, but also the case where there is another portion therebetween. Conversely, when a layer, film, region, plate, or other portion is described as being "under" the other portion, this includes not only the case where it is "directly under" the other portion, but also the case where there is another portion therebetween. Furthermore, in this application, being "located on" can include not only the case where it is located at the top, but also the case where it is located at the bottom.

[0032] The present invention relates to a heat sink assembly, which in one example includes first and second heat sinks each having a plurality of ribs integrally formed by extrusion molding along its internal longitudinal direction, the spaces between the ribs forming flow paths for a refrigerant, first and second faces open at both longitudinal ends, and a communication port on one side wall adjacent to the second face, the first and second heat sinks being integrated by the side walls forming a joining surface so that the communication ports coincide, the ribs of the first and second heat sinks having a length such that both ends of the ribs are spaced a predetermined distance from the first and second faces, and the open first and second faces at both ends of the first and second heat sinks being closed by end plugs inserted so as to be spaced apart from the ends of the ribs.

[0033] The heat sink assembly of the present invention having the above-described configuration has excellent structural rigidity because the heat sink is manufactured as a continuous body by extrusion molding. At the same time, the longitudinal ends and side walls of the ribs formed integrally with the heat sink are machined to form internal flow passages between the interconnected heat sinks, and the end plugs close the open surfaces, thereby forming cooling passages divided into inlets and outlets.

[0034] As a result, the heat sink assembly of the present invention is based on an extruded heat sink, which has the advantage of structural rigidity, but does not require a separate pipe for forming a flow path, occupies less space, and the simplified flow path configuration reduces the number of parts, thereby improving differential pressure.In addition, the heat dissipation area can be easily expanded by increasing the number of heat sinks to be joined.

[0035] Hereinafter, specific embodiments of the heat sink assembly 10 of the present invention will be described in detail with reference to the accompanying drawings. For reference, the directions of front, back, up, down, left, and right used in the following description to designate relative positions are intended to aid in understanding the invention, and unless otherwise specified, are based on the directions shown in the drawings.

[0036] (First embodiment) Fig. 1 is a view showing a heat sink assembly 10 according to one embodiment of the present invention, Fig. 2 is an exploded perspective view of the heat sink assembly 10, Fig. 3 is a detailed view of part "A" in Fig. 1, and Fig. 4 is a detailed view of part "B" in Fig. 1. The heat sink assembly 10 of the present invention will be described in detail with reference to the accompanying Figs. 1 to 4.

[0037] The heat sink assembly 10 of the present invention includes a first heat sink 101, a second heat sink 102, and end plugs 200 that seal the open faces of the first heat sink 101 and the second heat sink 102. The open faces of the first heat sink 101 and the second heat sink 102 are the faces at both ends in the longitudinal direction L, and for convenience of explanation, the two open faces are referred to as the first face 120 and the second face 130, respectively. Here, the longitudinal direction L is defined as the extrusion direction of the heat sink, i.e., the direction in which the ribs 110 extend, and the width direction W is defined as the direction perpendicular to the longitudinal direction L in which the multiple ribs 110 are spaced apart.

[0038] The first heat sink 101 and the second heat sink 102 are manufactured to have essentially the same structure. For example, the first heat sink 101 and the second heat sink 102 can be manufactured from an extrusion product in which a plurality of ribs 110 are integrally formed along the internal longitudinal direction L by extrusion molding. The first heat sink 101 and the second heat sink 102 can be prepared by cutting an extrusion product continuously manufactured by extrusion molding to a suitable length. In the first heat sink 101 and the second heat sink 102, the spaces between the spaced-apart ribs 110 form flow paths 112 through which the refrigerant flows, and the first surface 120 and the second surface 130 at both ends in the longitudinal direction L are open due to the characteristics of the extrusion product.

[0039] The first heat sink 101 and the second heat sink 102 are joined together by firmly joining one of their side walls through a joining process such as friction stir welding. Before joining, the side walls where the first heat sink 101 and the second heat sink 102 join together, i.e., the joining surface 142, are machined to form communication holes 140 in the first heat sink 101 and the second heat sink 102. The communication holes 140 provided on the joining surface 142 interconnect the flow paths 112 of the first heat sink 101 and the second heat sink 102.

[0040] 3 shows a structure in which the communication hole 140 is formed by cutting a predetermined length inward from the end of the side wall. In other words, the communication hole 140 is provided on one of the side walls adjacent to the second surface 130, based on the drawing. Of course, the communication hole 140 can be formed and joined in the middle of the side wall, but it is preferable to position the communication hole 140 at the end of the side wall to facilitate the flow of coolant between the first heat sink 101 and the second heat sink 102. Furthermore, machining the communication hole 140 by cutting a portion of the end of the side wall is advantageous in that it can be performed simultaneously with the machining for inserting the end plug 200, which will be described later.

[0041] 4 shows a structure in which a space into which the end plug 200 is inserted and a space into which the coolant flowing in and out of the first heat sink 101 and the second heat sink 102 can be distributed to the flow paths 112 between the ribs 110 are formed. These spaces are created by machining the ends of the ribs 110, which are accessible via the first surface 120 and the second surface 130, by cutting a predetermined length.

[0042] As shown in the exploded perspective view of FIG. 2 , the end plug 200 includes a front face 210 and an insert 220. The insert 220 is a protrusion sandwiched in the space between the upper and lower plates of the first and second heat sinks 101 and 102, and has a length corresponding to the internal width (the distance between the inner surfaces of the side walls) of the first and second heat sinks 101 and 102. For example, the end plug 200 can be hermetically joined to the first and second heat sinks 101 and 102 by friction stir welding the upper and lower plates of the first and second heat sinks 101 and 102 sequentially. By overlapping the weld depths of the friction stir welding performed on the top and bottom, four-sided sealing can be achieved on the first and second surfaces 120 and 130.

[0043] 4, the ribs 110 on the first surface 120 are machined to a length appropriate for the depth to which the insert 220 of the end plug 200 is inserted and for forming a space through which the refrigerant can flow in and out between the end plug 200 and the rib 110. As a result, the ribs 110 of the first heat sink 101 and the second heat sink 102 have a length such that both ends of the rib are spaced a predetermined distance from the first surface 120, and the ends of the rib 110 are spaced apart from the insert 220 of the end plug 200. Of course, the same machining is performed on the ribs 110 on the second surface 130.

[0044] In one embodiment of the present invention, the first surface 120 and the second surface 130 of the first heat sink 101 and the second heat sink 102 may each be closed with one end plug 200. To this end, both ends of the side walls of the first heat sink 101 and the second heat sink 102 that form the joining surface 142 may be formed with cutouts 150 that correspond to the depth to which the end plug 200 is inserted, i.e., the length of the insert 220.

[0045] In machining the cutout 150, the cutout 150 and the communication port 140 can be formed simultaneously. That is, when forming the cutout 150 at the end of the joining surface 142 of the second surface 130, the cutout 150 and the communication port 140 can be formed simultaneously by cutting deeper by the length of the communication port 140. The outside of the communication port 140 is sealed by the insert 220 of the end plug 200, and forming the communication port 140 continuously with the cutout in this way simplifies the processing procedure.

[0046] 5 is a diagram showing the structure of the entire ribs 110 of the heat sink assembly 10. The entire length of each rib 110 is approximately the same, but the points where both ends of each rib 110 are located are different. This varying structure of the ribs 110 is created by adjusting the machining depth of a cutting tool approaching through the first surface 120 and the second surface 130.

[0047] 5, the ribs 110 of the first heat sink 101 and the second heat sink 102 may be configured such that one end on the first surface 120 gradually moves away from the first surface 120 as it approaches the central mating surface 142, and the other end on the second surface 130 moves closer to the second surface 130 as it approaches the mating surface 142. In other words, because the insert 220 of the end plug 200 has a flat shape with a constant protruding length, the arrangement of the ribs 110 as described above causes the refrigerant flow space between the end plug 200 and the ribs 110 on the first surface 120 and the second surface to vary depending on the position. This is intended to promote smooth refrigerant flow, as will be described in the third embodiment.

[0048] (Second embodiment) FIG. 6 shows a second embodiment in which the heat transfer area of ​​the heat sink assembly 10 is expanded by adding another third heat sink 103 in the width direction W to the first heat sink 101 and second heat sink 102 described in the first embodiment.

[0049] The third heat sink 103 has the same structure as the first heat sink 101 and the second heat sink 102, so a duplicated description of the third heat sink 103 will be omitted. However, because the second heat sink 102 must be joined to the third heat sink 103 at the same time as being joined to the first heat sink 101, the second heat sink 102 is modified to have another communication hole 140 on the sidewall adjacent to the first surface 120. The additional communication hole 140 adjacent to the first surface 120 is formed on the sidewall opposite the communication hole 140 adjacent to the second surface 130. In other words, the two communication holes 140 provided in the second heat sink 102 are positioned diagonally opposite each other while changing the sidewalls on which they are formed.

[0050] The third heat sink 103 has essentially the same structure as the first heat sink 101 and the second heat sink 102, except that the position of the communication port 140 is adjusted to achieve fluid communication with the second heat sink 102. That is, the third heat sink 103 is also manufactured from the same extrusion. The communication port 140 of the third heat sink 103 is located on one side wall adjacent to the first surface 120 so as to connect to the communication port 140 added to the second heat sink 102. The side walls of the second heat sink 102 and the third heat sink 103 form another joining surface 142 so that the communication ports 140 of each heat sink 103 coincide with each other, thereby forming a single unit.

[0051] In the third heat sink 103, both ends of the rib 110 are also long enough to be separated a predetermined distance from the first surface 120 and the second surface 130, and the open first surface 120 and second surface 130 at both ends of the third heat sink 103 are closed by end plugs 200 spaced from the ends of the rib 110. Furthermore, the first surface 120 and the second surface 130 of the first heat sink 101, the second heat sink 102, and the third heat sink 103 are each closed by one end plug 200, and cutouts 150 corresponding to the depth at which the end plugs 200 are inserted may be formed at both ends of the side walls of the first heat sink 101, the second heat sink 102, and the third heat sink 103 that form the joining surface 142, as described in the first embodiment.

[0052] From the above description, it can be clearly understood that the heat sink assembly 10 of the present invention can continue to expand along the width direction W in the same manner with four or more heat sinks. For example, based on the heat sink assembly 10 having the first heat sink 101, the second heat sink 102, and the third heat sink 103 shown in FIG. 6, the Nth heat sink (where N is a natural number greater than or equal to 3) and the (N+1)th heat sink are joined together to form an integral unit by aligning the communication holes 140 formed on one side walls. The open first and second surfaces 120 and 130 at both ends of the (N+1)th heat sink can be continuously expanded by closing them with end plugs 200 inserted so as to be spaced apart from the ends of the ribs 110 formed along the internal longitudinal direction L. FIG. 7 exemplarily shows a heat sink assembly 10 including four heat sinks, to which a fourth heat sink 104 has been added.

[0053] In the heat sink assembly 10 of the present invention, each heat sink is prepared from the same extrusion, so the only accessory that needs to be prepared separately is a single end plug 200 that integrally closes the first surface 120 and the second surface 130, simplifying the components. Of course, the position of the communication hole 140 must be alternated, but the position of the communication hole 140 can be adjusted by machining, so in this respect the heat sink assembly 10 of the present invention has excellent scalability.

[0054] (Third embodiment) In the third embodiment, various embodiments in which a refrigerant flows into and out of the heat sink assembly 10 of the first and second embodiments will be described.

[0055] 8 is a diagram showing the flow of refrigerant in the heat sink assembly 10 including two heat sinks. Referring to FIG. 8, one of the first heat sink 101 and the second heat sink 102 has an inlet port 310 communicating with the internal flow path 112, and the other heat sink has an outlet port 320 communicating with the internal flow path 112.

[0056] Because the communication port 140 that fluidly connects the first heat sink 101 and the second heat sink 102 is close to the second surface 130, it is preferable that the inlet port 310 and the outlet port 320 be located on the first surface 120 diagonally relative to the communication port 140 in order to ensure a sufficiently long flow path. The inlet port 310 and the outlet port 320 are located in the space between the end plug 200 and the rib 110 on the first surface 120. The space between the end plug 200 and the rib 110 is a space shared by each of the flow paths 112, and therefore, by positioning the port 300 so that the refrigerant flows in and out through this space, the refrigerant can flow smoothly through all of the flow paths 112.

[0057] 9 and 10 are views showing an embodiment in which the heat sink assembly 10 of FIG. 8 is bonded to both sides of a pack center frame 400. The embodiments of FIGS. 9 and 10 differ in the flow pattern of the refrigerant formed in the heat sink assembly 10.

[0058] In the embodiment of Figure 9, the heat sink assembly 10 of Figure 8 becomes one module 105 (first heat sink and second heat sink modules), and the flow paths 112 are connected to each other to form a further expanded heat sink assembly 10. Each module 105 is joined to the pack center frame 400, and the modules 105 are not joined to each other, which is slightly different from the expansion by joining heat sinks described in the second embodiment. The modules 105 with the pack center frame 400 between them are fluidly connected by connecting the outlet port 320 provided in one module 105 to the inlet port 310 provided in the other module 105 with a pipe member 330.

[0059] In contrast, the embodiment of Figure 10 has the same structure in that two modules 105 are joined to the pack center frame 400, but the modules 105 are not fluidly connected to each other. This embodiment has the advantage that the inlet and outlet patterns of the coolant can be configured in various ways. For example, as shown in Figure 10, by configuring the ports 300 of each module 105 adjacent to the pack center frame 400 as inlet ports 310, the coolant temperature on the pack center frame 400 side can be designed to be kept relatively low.

[0060] 11 is a diagram showing the flow of refrigerant through the heat sink assembly 10 of FIG. 6, in which three heat sinks are joined in series. One of the first heat sink 101 and the third heat sink 103 has an inlet port 310 communicating with the flow path 112, and the other heat sink has an outlet port 320 communicating with the flow path 112. As a result, the flow paths 112 of the first heat sink 101, the second heat sink 102, and the third heat sink 103 are connected in series, allowing the refrigerant to flow in one direction. Because the flow paths 112 of the first heat sink 101, the second heat sink 102, and the third heat sink 103 are internally connected through the communication port 140, it is sufficient for the heat sink assembly 10 to have only one inlet port 310 and one outlet port 320.

[0061] 11, one of the inlet port 310 and the outlet port 320 is located in the space between the end plug 200 and the rib 110 on the first surface 120, and the other port 300 is located in the space between the end plug 200 and the rib 110 on the second surface 130. If the inlet port 310 and the outlet port 320 are positioned diagonally relative to the adjacent communication port 140 on the upstream side (based on the refrigerant flow) to maximize the length of the entire flow path 112, then the inlet port 310 and the outlet port 320 will be arranged diagonally because there is an odd number of heat sinks.

[0062] Figure 12 is a diagram showing the refrigerant flow in the heat sink assembly 10 of Figure 7, in which four heat sinks are joined in series. The flow pattern is basically the same as that of the heat sink assembly 10 of Figure 11, with the only difference being that the number of heat sinks is an even number, and therefore the inlet port 310 and the outlet port 320 are located on the same first surface 120 (see Figure 12).

[0063] The present invention has been described in more detail above through the drawings and embodiments, etc. However, the configurations described in the drawings or embodiments in this specification are merely one embodiment of the present invention and do not represent all of the technical ideas of the present invention, and therefore, there may be various equivalents and modifications that can replace them at the time of filing this application. [Explanation of symbols]

[0064] 10: Heat sink assembly 100: Heat sink 101: 1st heat sink 102: Second heat sink 103: 3rd heat sink 104: 4th heat sink 105: Heat sink module 110: Rib 112: Flow path 120: 1st page 130:Second side 140: Connecting port 142: Joint surface 150: Incision 200: End plug 210:Front 220: Insert 300:Port 310: Inlet port 320: Exit port 330: Pipe member 400: Pack center frame L: Longitudinal direction W: Width direction

Claims

1. a first heat sink and a second heat sink, each having a plurality of ribs integrally formed along an internal longitudinal direction by extrusion molding, spaces between the ribs forming flow paths for a refrigerant, first and second faces at both ends in the longitudinal direction being open, and a communication port provided on one side wall adjacent to the second face; the first heat sink and the second heat sink are integrated by the side walls forming a joining surface so that the communication openings coincide with each other; the ribs of the first heat sink and the second heat sink have lengths such that both ends of the ribs are spaced a predetermined distance from the first surface and the second surface, a heat sink assembly, wherein the open first and second surfaces at both ends of the first and second heat sinks are closed by end plugs inserted so as to be spaced apart from the ends of the ribs;

2. the first surface and the second surface of the first heat sink and the second heat sink are closed by an end plug, respectively; 2. The heat sink assembly of claim 1, wherein the first and second heat sinks have side walls, each of which forms the joining surface, formed with incisions at both ends corresponding to the depth at which the end plugs are inserted.

3. 3. The heat sink assembly of claim 1, wherein one of the first heat sink and the second heat sink has an inlet port communicating with the flow path, and the other heat sink has an outlet port communicating with the flow path.

4. The inlet port and the outlet port are The heat sink assembly of claim 3 , located in a space between the end plug and the rib on the first surface.

5. The inlet port and the outlet port are The heat sink assembly according to claim 4 , wherein the heat sink assembly is positioned diagonally relative to the communication opening.

6. The ribs of the first heat sink and the second heat sink are The heat sink assembly of claim 5 , wherein one end of the first surface side is farther from the first surface as it approaches the joining surface, and the other end of the second surface side is closer to the second surface as it approaches the joining surface.

7. a pair of modules of the first heat sink and the second heat sink are provided, the modules being integrated by the side walls forming the joining surfaces so that the communication openings coincide with each other; 6. The heat sink assembly according to claim 5, wherein the outlet port provided in one module is connected to the inlet port provided in another module by a pipe member.

8. the second heat sink has another communication port on the side wall adjacent to the first surface; a third heat sink having a plurality of ribs integrally formed along an internal longitudinal direction by extrusion molding, spaces between the ribs forming flow paths for the coolant, first and second faces at both longitudinal ends being open, and having a communication port on one side wall adjacent to the first face; the second heat sink and the third heat sink are integrated by the side walls forming a joining surface so that the communication openings coincide with each other; the rib of the third heat sink has a length such that both ends of the rib are spaced a predetermined distance from the first surface and the second surface, 3. The heat sink assembly according to claim 1, wherein the first and second open surfaces at both ends of the third heat sink are closed by end plugs inserted so as to be spaced apart from the ends of the ribs.

9. the first surface and the second surface of the first heat sink, the second heat sink, and the third heat sink are each closed by an end plug; 9. The heat sink assembly of claim 8, wherein the first, second and third heat sinks have side walls, each of which forms the joining surface, at both ends thereof having an incision corresponding to a depth into which the end plug is inserted.

10. 9. The heat sink assembly of claim 8, wherein one of the first heat sink and the third heat sink has an inlet port communicating with the flow path, and the other heat sink has an outlet port communicating with the flow path.

11. Of the inlet port and the outlet port, one of the ports is located in a space between the end plug and the rib on the first surface; The heat sink assembly of claim 10 , wherein the other port is located in a space between the end plug and the rib on the second surface.

12. The inlet port and the outlet port are The heat sink assembly according to claim 11 , wherein the communication port is located diagonally opposite to the communication port most adjacent to the upstream side with respect to the flow of the coolant.

13. the Nth heat sink (where N is a natural number of 3 or more) and the (N+1)th heat sink are joined together to form an integral unit such that communication holes formed on one side walls of the Nth heat sink and the (N+1)th heat sink coincide with each other; 9. The heat sink assembly of claim 8, wherein the open first and second surfaces at both ends of the (N+1)th heat sink are closed by end plugs inserted so as to be spaced apart from the ends of ribs formed along the internal longitudinal direction.

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