Heat sink assembly

Abstract

The disclosed heat sink assembly comprises: a heat sink in which a plurality of heat sink units having open first and second surfaces at opposite ends thereof in the longitudinal direction are joined in the width direction; and a first end plug and a second end plug for closing the first and second surfaces, respectively, at opposite ends of the heat sink, wherein the heat sink has a protruding stepped portion having a higher height along the edge of a first surface side, and the first end plug includes: a 1-1 end plug coupled so that cooling flow paths of at least one heat sink unit disposed in a central region from among the plurality of heat sink units communicate with each other on the first surface; and a 1-2 end plug coupled so that cooling flow paths of the remaining heat sink units from among the plurality of heat sink units communicate with each other on the first surface.

Description

heatsink assembly

[0001] The present invention relates to a heat sink assembly mounted on the bottom surface of a battery pack equipped with a plurality of secondary batteries to promote heat dissipation of the battery pack.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2025-0015566 filed on February 7, 2025, and all contents disclosed in the document of said Korean patent application are incorporated herein as part of this specification.

[0003] Unlike primary batteries, secondary batteries are rechargeable and are currently the subject of extensive research and development due to their potential for miniaturization and high capacity. The demand for secondary batteries as an energy source is increasing rapidly due to the growing technological development and demand for mobile devices, as well as the rise of electric vehicles and energy storage systems driven by the contemporary need for environmental protection.

[0004] Rechargeable batteries are classified into coin batteries, cylindrical batteries, prismatic batteries, and pouch batteries according to the shape of the battery case. In rechargeable batteries, the electrode assembly mounted inside the battery case is a power generation device capable of charging and discharging, consisting of a laminated structure of electrodes and separators.

[0005] Since secondary batteries require continuous use over long periods, it is necessary to effectively control the heat generated during the charging and discharging process. If the cooling of the secondary battery is not performed smoothly, a positive feedback chain reaction occurs where the temperature rise causes an increase in current, and this increase in current again causes a temperature rise, eventually leading to a catastrophic state of thermal runaway.

[0006] To effectively dissipate heat generated by secondary batteries, heat sinks (also called cooling plates) through which a refrigerant flows are widely used. The heat sink is mounted on the bottom surface of a group of multiple secondary batteries, for example, a battery pack containing multiple secondary batteries, and performs a cooling function by absorbing heat generated inside the pack using a refrigerant and releasing it to the outside.

[0007] Heat sinks can be classified into brazed heat sinks and extrusion heat sinks depending on their structure or manufacturing method. Brazed heat sinks are constructed by brazing two plates to form flow channels; while they offer high design freedom for the channels, they have the disadvantage of being unfavorable for structural rigidity due to the degradation of material properties. In contrast, extrusion heat sinks, manufactured as a continuous body through extrusion molding, are advantageous for structural rigidity. However, they are limited to straight channels, resulting in a large number of ports and consequently, the pipes required for connections occupy space, which is a disadvantage.

[0008] The purpose of the present invention is to provide a heatsink assembly that is an extrusion heatsink, occupies less space by not requiring a separate pipe for forming flow paths, reduces the number of parts through a simplified flow path configuration, and maximizes the cooling area.

[0009] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems will be clearly understood by a person skilled in the art from the description of the invention below.

[0010] The present invention relates to a heat sink assembly, wherein in one embodiment, a plurality of ribs are integrally formed internally along the longitudinal direction by extrusion molding, and a hollow portion between the ribs forms a cooling channel, and a plurality of heat sink units are joined along the width direction, with a first surface and a second surface at both ends of the longitudinal direction open, and a first end plug and a second end plug that respectively close the first surface and the second surface at both ends of the heat sink, wherein the heat sink has a protruding step portion with a higher height along the edge of the first surface side, and the first end plug includes a first-1 end plug that is coupled so that the cooling channel of at least one heat sink unit disposed in the central region among the plurality of heat sink units communicates with one another on the first surface, and a first-2 end plug that is coupled so that the cooling channel of the remaining heat sink unit among the plurality of heat sink units communicates with one another on the first surface, and the second end plug is coupled so that the cooling channel of the entire heat sink unit communicates with one another on the second surface.

[0011] In one embodiment, the first-1 end plug may be an inlet plug forming an inlet passage, the first-2 end plug may be an outlet plug forming an outlet passage, and the second end plug may be a return plug forming a return passage.

[0012] The inlet plug above can close the first surface such that the portion of the rib of the heat sink unit placed in the central area is cut to form the inlet passage.

[0013] The outlet plug can close the first surface such that the portion of the rib of the remaining heat sink unit cut, and the portion of the protruding step portion of the heat sink unit placed in the central area cut, form the outlet passage.

[0014] The above outlet plug can also close the portion of the protruding stepped part of the remaining heat sink unit that has been cut.

[0015] The above outlet Euro can be connected as one by means of the portion where the rib of the remaining heatsink unit is cut and the portion where the protruding step portion of the entire heatsink unit is cut.

[0016] The above inlet channel may be positioned below the outlet channel on the first surface of the heat sink unit positioned in the central area.

[0017] To this end, the outlet plug may have a cutout providing a space for the inlet plug to be coupled to a first surface of the heat sink unit disposed in the central area, and the inlet plug and the outlet plug may have the same length protruding from the first surface.

[0018] Meanwhile, a heat sink assembly according to one embodiment of the present invention may include an inlet port connected to the inlet passage by penetrating one of the heat sink units disposed in the central region.

[0019] In addition, it may include an outlet port connected to the outlet passage by penetrating any one of the remaining heat sink units.

[0020] The heat sink assembly of the present invention having the above configuration can interconnect the cooling channels of heat sink units arranged on both edges without a separate pipe structure through a protruding stepped portion formed on the first surface side of the heat sink.

[0021] That is, by simply connecting the first-1 end plug and the first-2 end plug to the first surface of the heatsink, two separate flow paths for an inlet and an outlet can be formed, and since the protruding step portion forms a connecting passage, the length of the first end plug protruding can be minimized. Accordingly, the cooling surface of the heatsink assembly can be maximized based on the same area with the same aspect ratio.

[0022] Furthermore, the overall structural rigidity of the heatsink assembly of the present invention is reinforced by the protruding stepped portion. Accordingly, the safety of the battery pack to which the heatsink assembly of the present invention is applied is improved.

[0023] However, the technical effects obtainable through the present invention are not limited to those described above, and other unmentioned effects will be clearly understood by a person skilled in the art from the description of the invention below.

[0024] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0025] FIG. 1 is a drawing illustrating a heatsink assembly according to one embodiment of the present invention.

[0026] FIG. 2 is an exploded perspective view of a heatsink assembly.

[0027] FIG. 3 is a side view showing the first side of a heatsink assembly.

[0028] FIG. 4 is a side view showing an outlet plug mounted on the first surface of a heatsink assembly.

[0029] FIG. 5 is a perspective view illustrating an outlet channel and an inlet channel formed on the first surface of a heatsink assembly.

[0030] FIG. 6 is a perspective view illustrating a heatsink assembly with an inlet port and an outlet port installed.

[0031] FIG. 7 is a cross-sectional view illustrating a structure in which an inlet port and an outlet port are installed in the heatsink assembly of FIG. 6.

[0032] FIG. 8 is a diagram illustrating the flow structure in the heatsink assembly of FIG. 6.

[0033] The present invention is capable of various modifications and may have various embodiments, and specific embodiments are to be described in detail below.

[0034] However, this is not intended to limit the invention to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0035] In the present invention, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not excluding in advance the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0036] Furthermore, in the present invention, when a part such as a layer, film, region, or plate is described as being "on" another part, this includes not only cases where it is "immediately above" the other part, but also cases where there is another part in between. Conversely, when a part such as a layer, film, region, or plate is described as being "under" another part, this includes not only cases where it is "immediately below" the other part, but also cases where there is another part in between. Additionally, in the present application, being "placed on" may include cases where it is placed on the lower part as well as on the upper part.

[0037]

[0038] The present invention relates to a heat sink assembly, wherein in one embodiment, a plurality of ribs are integrally formed internally along the longitudinal direction by extrusion molding, and a hollow portion between the ribs forms a cooling channel, and a plurality of heat sink units are joined along the width direction, with a first surface and a second surface at both ends of the longitudinal direction open, and a first end plug and a second end plug that respectively close the first surface and the second surface at both ends of the heat sink, wherein the heat sink has a protruding step portion with a higher height along the edge of the first surface side, and the first end plug includes a first-1 end plug that is coupled so that the cooling channel of at least one heat sink unit disposed in the central region among the plurality of heat sink units communicates with one another on the first surface, and a first-2 end plug that is coupled so that the cooling channel of the remaining heat sink unit among the plurality of heat sink units communicates with one another on the first surface, and the second end plug is coupled so that the cooling channel of the entire heat sink unit communicates with one another on the second surface.

[0039] The heat sink assembly of the present invention having the above configuration can interconnect the cooling channels of heat sink units arranged on both edges without a separate pipe structure through a protruding stepped portion formed on the first surface side of the heat sink.

[0040] That is, by simply connecting the first-1 end plug and the first-2 end plug to the first surface of the heatsink, two separate flow paths for an inlet and an outlet can be formed, and since the protruding step portion forms a connecting passage, the length of the first end plug protruding can be minimized. Accordingly, the cooling surface of the heatsink assembly can be maximized based on the same area with the same aspect ratio.

[0041] Hereinafter, specific embodiments of the heat sink assembly (10) of the present invention will be described in detail with reference to the attached drawings. For reference, the directions of front, back, up, down, left, and right used to specify relative positions in the following description are intended to aid in understanding the invention, and unless otherwise specifically defined, the directions shown in the drawings are used as the reference.

[0042]

[0043] [First embodiment]

[0044] FIG. 1 is a drawing illustrating a heat sink assembly (10) according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the heat sink assembly (10), and FIG. 3 is a side view illustrating a first surface (112) of the heat sink assembly (10). With reference to FIG. 1 to 3, the overall structure of the exemplary heat sink assembly (10) illustrated in the drawings will be described.

[0045] The present invention relates to a heat sink assembly (10), particularly an extruded heat sink (100). The heat sink assembly (10) comprises a heat sink (100) in which a plurality of heat sink units (110) are joined in a unidirectional manner, and a first end plug (200) and a second end plug (220) that respectively close an open first surface (112) and a second surface (114) at both ends of the heat sink (100).

[0046] Each heat sink unit (110) is manufactured as a continuous body through extrusion molding, and a plurality of heat sink units (110) are joined in one direction to form a single heat sink (100). The heat sink (100) forms the main body of the heat sink assembly (10). Each heat sink unit (110) has a plurality of ribs (120) integrally formed inside it along the longitudinal direction (L). The heat sink unit (110) can be prepared by cutting an extruded product manufactured as a continuous body to a designed length.

[0047] A plurality of ribs (120) are spaced apart to form an appropriate spacing, and the hollow portions between the ribs (120) form a cooling channel (122) through which a cooling medium flows. Due to the characteristics of the extruded product, the first surface (112) and the second surface (114) at both ends in the longitudinal direction (L) of the heat sink unit (110) are open, and through the first surface (112) and the second surface (114), the ribs (120) inside the heat sink unit (110) can be accessed and processed. Through this processing, a space for inserting a first end plug (200) and a second end plug (220) that respectively close the first surface (112) and the second surface (114) at both ends of the heat sink (100), and a space where a plurality of cooling channels (122) merge can be created.

[0048] In the illustrated exemplary embodiment, the heatsink (100) has a total of five heatsink units (110) joined along the width direction (W). All heatsink units (110) may have the same specifications, or heatsink units (110) of different specifications may be combined for any purpose. In the exemplary embodiment of FIGS. 1 to 3, the central heatsink unit (110) is provided with a center beam (116) that partitions a plurality of battery assemblies (not shown) to be mounted thereon on both sides of the width direction (W).

[0049] The heat sink assembly (10) of the present invention comprises a plurality of heat sink units (110) joined together, and the heat sink (100) is provided with a protruding step portion (130) having a higher height along the edge of the first surface (112). The protruding step portion (130) forms a thick clearance portion over the cooling channel (122) formed by a plurality of ribs (120), and as will be described later, the cooling channels (122) of a plurality of heat sink units (110) that are not consecutive are connected through the protruding step portion (130). Other parts of the heat sink (100) other than the protruding step portion (130) may form a flat surface with a lower height than this. Here, the longitudinal direction (L) refers to the extrusion molding direction of the heat sink unit (110), that is, the direction in which the rib (120) is extended, and the width direction (W) is defined as a direction perpendicular to the longitudinal direction (L) on the same plane, corresponding to the direction in which the plurality of ribs (120) are spaced apart.

[0050] The open first surface (112) and second surface (114) at both ends of the heatsink (100) are closed by combining the first end plug (200) and the second end plug (220), respectively. The first end plug (200) and the second end plug (220) each consist of an insert (230) that is inserted into the heatsink (100) and a front face (232) that covers the first surface (112) and the second surface (114) of the heatsink (100) after joining. That is, when viewed from the width direction (W), the first and second end plugs (200, 220) form a shape generally similar to the English alphabet "T".

[0051] For a heat sink (100) in which a plurality of heat sink units (110) are joined, machining is performed to cut a portion of both ends in the longitudinal direction (L) of a plurality of ribs (120) in order to secure a space for inserting the inserts (230) of the first and second end plugs (200, 220). The depth of the cutting process performed on the ribs (120) in this manner is greater than the length of the inserts (230) of the first and second end plugs (200, 220). Accordingly, a space is formed in which the ribs (120) are cut beyond the length of the inserts (230) that are fitted into the first surface (112) and the second surface (114) of the heat sink (100), and the refrigerant flowing through the plurality of cooling channels (122) that share this space can be joined.

[0052] Referring to FIGS. 2 and 3, in the illustrated embodiment, the first end plug (200) includes a first-1 end plug (210) that is coupled so that the cooling path (122) of at least one heatsink unit (110) disposed in the central region among the plurality of heatsink units (110) communicates with one another on the first surface (112), and a first-2 end plug (212) that is coupled so that the cooling path (122) of the remaining heatsink unit (110) among the plurality of heatsink units (110) (in the following description, the heatsink units on both sides to which the first-1 end plug (210) is not coupled are referred to as the remaining heatsink units) communicate with one another on the first surface (112). And, the second end plug (220) is coupled so that the cooling path (122) of the entire heatsink unit (110) communicates with one another on the second surface (114).

[0053] According to the structure of the first end plug (200) and the second end plug (220), one flow is formed through a plurality of cooling channels (122) connected by the first-1 end plug (210), and two flows are formed by being divided into two sides through a plurality of cooling channels (122) connected by the first-2 end plug (212), while the separated flows of the first-1 end plug (210) and the first-2 end plug (212) are connected to each other on the second surface (114) by the second end plug (220).

[0054] One flow created by the first-1 end plug (210) and two divided flows created by the first-2 end plug (212) can each be configured as an inlet flow path and an outlet flow path, or vice versa. The illustrated embodiment adopts the direction of electron flow. This assumes an arrangement in which a busbar assembly of a plurality of battery assemblies (not shown) mounted on the heatsink (100) is densely packed toward the center of the heatsink (100). Since the amount of heat generated by the busbar assembly where the current is concentrated is high, it may be desirable for the overall cooling structure for a low-temperature refrigerant (e.g., cooling water) to flow into the center of the heatsink (100). In this cooling structure, the first-1 end plug (210) is an inlet plug (240) forming an inlet passage (300), the first-2 end plug (212) is an outlet plug (250) forming an outlet passage (310), and the second end plug (220) may be a return plug (260) forming a return passage (320).

[0055] However, the first-1 end plug (210) is an inlet plug (240) and the first-2 end plug (212) is an outlet plug (250) in the case where the cooling path (122) of the heatsink unit (110) placed in the central area forms an inlet path. Conversely, the first-1 end plug (210) may be configured to be an outlet plug (250) and the first-2 end plug (212) to be an inlet plug (240) so that the cooling path (122) of the heatsink unit (110) placed in the central area forms an outlet path. Therefore, it will be obvious that the configuration of the present invention is not limited to an embodiment in which the cooling path (122) of the heatsink unit (110) placed in the central area forms an inlet path.

[0056] FIG. 4 is a side view showing an outlet plug (250) mounted on a first surface (112) of a heatsink assembly (10), and FIG. 5 is a perspective view showing an outlet channel and an inlet channel formed on the first surface (112) of a heatsink assembly (10). With reference to FIG. 3 to 5, the structure of the inlet channel and the outlet channel formed by the first end plug (200) mounted on the first surface (112) of the heatsink (100) will be described in detail.

[0057] The inlet plug (240) closes a portion of the first surface (112) so that the portion of the rib (120) of the heat sink unit (110) (in the illustrated exemplary embodiment, three central heat sink units) cut out forms an inlet passage (300). The outlet plug (250) closes the first surface (112) so that the portion of the rib (120) of the remaining heat sink unit (110) cut out and the portion of the protruding step (130) of the heat sink unit (110) placed in the central area cut out form an outlet passage (310). Here, the outlet plug (250) may also close the portion of the protruding step (130) of the remaining heat sink unit (110) cut out together. That is, the outlet plug (250) can close the entire remaining surface of the first surface (112), excluding the portion closed by the inlet plug (240) (see FIG. 3 and FIG. 4).

[0058] As clearly shown in FIG. 5, the outlet flow path is formed such that the portion of the rib (120) of the remaining heat sink unit (110) cut and the portion of the protruding step portion (130) of the entire heat sink unit (110) cut are mutually connected and formed as one. In other words, the heat sink assembly (10) provided by the present invention utilizes the spare space of the protruding step portion (130) to connect the cooling flow paths (122) of the remaining heat sink units (110) that are divided on both sides by the heat sink unit (110) in the central area. Due to this structure, the heat sink assembly (10) of the present invention can internally connect the two flow outlet flow paths separated on both sides of the central inlet flow path without the need for separate pipe structures or duct structures. This simplifies the structure of the heat sink assembly (10) composed of a plurality of extruded heat sink units (110).

[0059] In the illustrated embodiment, the inlet channel is positioned below the outlet channel on the first surface (112) of the heatsink unit (110) positioned in the central area. To this end, the outlet plug (250) may have a cutout (252) that provides a space for the inlet plug (240) to be coupled to the first surface (112) of the heatsink unit (110) positioned in the central area.

[0060] On the other hand, the inlet plug (240) and the outlet plug (250) may have the same length of protrusion on the first surface (112). That is, the first surface (112) of the heatsink assembly (10) may be flat, thereby making the overall shape of the heatsink assembly (10) compact.

[0061]

[0062] [Second embodiment]

[0063] FIG. 6 is a perspective view showing a heatsink assembly (10) with an inlet port (400) and an outlet port (410) installed, and FIG. 7 is a cross-sectional view showing a structure with an inlet port (400) and an outlet port (410) installed in the heatsink assembly (10) of FIG. 6.

[0064] Referring to FIGS. 6 and 7, a heat sink assembly (10) according to one embodiment of the present invention includes an inlet port (400) connected to an inlet passage (300) by penetrating one of the heat sink units (110) arranged in a central area. And, it includes an outlet port (410) connected to an outlet passage (310) by penetrating one of the remaining heat sink units (110).

[0065] As described above, the inlet plug (240) closes a portion of the first surface (112) so that the portion of the rib (120) of the heat sink unit (110) placed in the central area forms an inlet passage (300). Then, the outlet plug (250) closes the first surface (112) so that the portion of the rib (120) of the remaining heat sink unit (110) and the portion of the protruding step portion (130) of the heat sink unit (110) placed in the central area form an outlet passage (310). The inlet passage (300) and the outlet passage (310) are separated so as not to communicate with each other. In the illustrated embodiment, the cooling channels (122) of the remaining heat sink units (110), which are divided on both sides by the heat sink unit (110) in the central region, are connected in the form of a bridge through the clearance of the protruding step portion (130) to form a single outlet passage (310), and the inlet passage (300) is separated and arranged below the bridge of the outlet passage (310).

[0066] FIG. 8 is a diagram illustrating the flow structure in the heat sink assembly (10) of FIG. 6. When coolant flows into the inlet port (400) connected to the inlet passage (300), the inflowed coolant flows toward the second surface (114) along the cooling passages of the heat sink unit (110) located in the central area. The coolant that reaches the second surface (114) branches out to both sides along the return passage (320) formed by the return plug (260) and flows toward the first surface (112) along the cooling passages of the remaining heat sink unit (110). That is, the flow direction of the coolant flowing along the cooling passages of the heat sink unit (110) located in the central area and the cooling passages of the remaining heat sink unit (110) is opposite. Coolant flowing toward the first surface (112) along the cooling passages of the remaining heatsink unit (110) joins at the outlet passage (310), and the coolant joined at the outlet passage (310) is discharged through the outlet port (410). Accordingly, the coolant flow structure inside the heatsink assembly (10) is completed.

[0067]

[0068] The present invention has been described in more detail above through drawings and embodiments. However, the configurations described in the drawings or embodiments described in this specification are merely one embodiment of the present invention and do not represent all technical concepts of the present invention; therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0069] [Explanation of the symbol]

[0070] 10: Heatsink assembly

[0071] 100: Heatsink

[0072] 110: Heatsink unit

[0073] 112: Page 1

[0074] 114: Page 2

[0075] 120: Liv

[0076] 122: Cooling Euro

[0077] 130: Protruding stepped section

[0078] 200: 1st end plug

[0079] 210: 1-1 End Plug

[0080] 212: 1st-2nd End Plug

[0081] 220: Second end plug

[0082] 230: Insert

[0083] 232: Front

[0084] 240: Inlet plug

[0085] 250: Outlet plug

[0086] 252: Incision

[0087] 260: Return plug

[0088] 300: Inlet passage

[0089] 310: Outlet Passage

[0090] 320: Return Passage

[0091] 400: Inlet Port

[0092] 410: Outlet Port

[0093] L: Length direction

[0094] W: Width direction

Claims

1. A heatsink in which a plurality of heatsink units are joined along the width direction, wherein a plurality of ribs are integrally formed internally along the longitudinal direction by extrusion molding, the hollow portion between the ribs forms a cooling channel, and the first and second surfaces at both ends of the longitudinal direction are open; and A first end plug and a second end plug that respectively close the first surface and the second surface at both ends of the heatsink; Includes, The heat sink above is provided with a protruding stepped portion having a higher height along the edge of the first surface side, The above-mentioned first end plug is, A first-1 end plug that is coupled such that the cooling path of at least one heat sink unit disposed in the central region among the plurality of heat sink units communicates with one another on the first surface, and It includes first and second end plugs that are coupled so that the cooling passages of the remaining heat sink units among the plurality of heat sink units communicate with each other on the first surface, The above second end plug is, A heatsink assembly that is coupled such that the cooling channels of the entire heatsink unit communicate with each other on the second surface.

2. In Paragraph 1, The above-mentioned first-1 end plug is an inlet plug that forms an inlet passage, and The above-mentioned first- and second end plugs are outlet plugs that form an outlet passage, and The above second end plug is a return plug forming a return passage, heatsink assembly.

3. In Paragraph 2, The above inlet plug is, A heatsink assembly that closes the first surface such that a portion of the rib of the heatsink unit disposed in the central region forms the inlet passage.

4. In Paragraph 3, The above outlet plug is, A heatsink assembly that closes the first surface such that the portion of the rib of the remaining heatsink unit cut, and the portion of the protruding step portion of the heatsink unit disposed in the central area cut, form the outlet passage.

5. In Paragraph 4, The above outlet plug is, A heatsink assembly that also closes the portion of the protruding stepped portion of the remaining heatsink unit.

6. In Paragraph 5, The above outlet Euro is, A heatsink assembly in which the portion of the rib cut by the remaining heatsink unit and the portion of the protruding step cut by the entire heatsink unit are connected and joined as one.

7. In Paragraph 6, The above inlet Euro is, A heatsink assembly disposed below the outlet flow path on a first face of a heatsink unit disposed in the central region above.

8. In Paragraph 7, The above outlet plug has a cutout providing a space for the inlet plug to be coupled to a first surface of a heatsink unit disposed in the central region, and The above inlet plug and outlet plug are heatsink assemblies having the same length protruding from the first surface.

9. In Paragraph 3, A heatsink assembly comprising an inlet port connected to an inlet passage by penetrating any one of the heatsink units disposed in the central region.

10. In Paragraph 4, A heatsink assembly comprising an outlet port connected to an outlet passage by penetrating any one of the remaining heatsink units.

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