Heat sink assembly

Abstract

A heat sink assembly disclosed herein comprises: a heat sink in which a plurality of ribs are integrally molded along an inner longitudinal direction and a first surface and a second surface at both ends in the longitudinal direction are open; and first and second end plugs closing the first and second surfaces at both ends of the heat sink, respectively, wherein the heat sink includes a cooling flow path in which a refrigerant introduced from the first end plug side flows along an inlet flow path, changes direction along a return flow path from the second end plug side, flows into an outlet flow path, and then flows to the first end plug side, and the second end plug includes a flow guide on the return flow path that is switched from the inlet flow path to the outlet flow path.

Description

Heatsink assembly

[0001] The present invention relates to a heat sink assembly that forms the bottom surface of a battery pack having a plurality of secondary batteries, or is mounted on the bottom surface to promote heat dissipation of the battery pack.

[0002] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2023-0120563, filed September 11, 2023, the entire contents of which are incorporated herein by reference.

[0003] Unlike primary batteries, secondary batteries are rechargeable and, due to their potential for miniaturization and large capacity, have been the subject of extensive research and development in recent years. With increasing technological development and demand for mobile devices, and the emergence of electric vehicles and energy storage systems in response to the era's growing environmental concerns, demand for secondary batteries as an energy source is rapidly increasing.

[0004] Secondary batteries are classified into coin-shaped, cylindrical, square, and pouch-shaped batteries, depending on the shape of their battery cases. In secondary batteries, the electrode assembly mounted inside the battery case is a rechargeable, power-generating element comprised of a laminated structure of electrodes and a separator.

[0005] Because secondary batteries require continuous, long-term use, effective control of the heat generated during charging and discharging is essential. If secondary batteries are not properly cooled, a temperature rise triggers an increase in current, which in turn triggers a temperature rise, resulting in a positive feedback loop, ultimately leading to a catastrophic condition known as thermal runaway.

[0006] To effectively dissipate heat generated by secondary batteries, heat sinks (also called cooling plates) with circulating coolant are widely used. These heat sinks are mounted on the underside of a battery pack containing multiple secondary batteries, for example. They perform a cooling function by absorbing heat generated within the pack through coolant and dissipating it to the outside.

[0007] Heat sinks can be categorized into brazed and extruded heat sinks based on their structure and manufacturing method. Brazed heat sinks, which form a flow path by brazing two plates, offer a high degree of freedom in flow path design. However, they suffer from reduced structural rigidity due to the deterioration of the material properties. In contrast, extruded heat sinks, manufactured as a continuous body via extrusion molding, offer advantages in structural rigidity. However, they only allow for straight flow paths, resulting in a large number of ports and the need for pipes for connection, which takes up space.

[0008] The purpose of the present invention is to provide a heat sink assembly that can improve differential pressure by reducing the number of parts with a simplified flow path configuration and taking up less space by not requiring a separate pipe for flow path formation.

[0009] In addition, another object of the present invention is to provide a heat sink assembly capable of absorbing heat evenly over the entire area by uniformly inducing the flow rate of refrigerant flowing through a plurality of channels.

[0010] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0011] The present invention relates to a heat sink assembly, and in one example, includes a heat sink having a plurality of ribs integrally formed along an internal longitudinal direction, first and second sides of both longitudinal ends being open, and first and second end plugs that close the first and second sides of both ends of the heat sink, respectively, wherein the heat sink has a cooling path through which refrigerant introduced from the first end plug side flows along an inlet path, changes direction along a return path from the second end plug side, is introduced into an outlet path, and then flows toward the first end plug side, and the second end plug has a flow guide on a return path that is converted from the inlet path to the outlet path.

[0012] The first end plug may be provided with an inlet port through which the refrigerant flows in and an outlet port through which the refrigerant flows out.

[0013] In addition, the inlet flow path connected to the inlet port is arranged in the central region of the heat sink, the outlet ports are provided in pairs, and the outlet flow paths connected to the outlet ports can be arranged on both sides of the inlet flow path.

[0014] The first end plug may include an inlet plug that closes the first side of the inlet flow path and a pair of outlet plugs that close the first side of the outlet flow path.

[0015] And, the fluid guide may have the shape of a protrusion protruding from the surface of the second end plug.

[0016] And, the flow guide may be arranged to face the first outlet flow path that is closest to the inlet flow path among the paths that transition from the inlet flow path to the return flow path.

[0017] Additionally, the flow guide may have an inclined surface that guides the refrigerant, which has changed direction from the inlet flow path to the return flow path, toward the first outlet flow path.

[0018] In one embodiment of the present invention, the inclined surface of the flow guide may be arranged between the inlet and the center point along the width direction of the first outlet flow path.

[0019] For example, the peak of the inclined surface of the above flow guide may be located at the center point in the width direction of the first outlet euro.

[0020] Furthermore, as the distance from the first outlet euro to the outlet euro that is gradually spaced apart from the inlet euro may increase, the space between the second end plug surface and the inlet of each outlet euro may increase.

[0021] To this end, the distance between the end of the rib forming each outlet mile and the surface of the second end plug may linearly increase from the first outlet mile to the outlet mile that is gradually spaced apart from the inlet mile.

[0022] The heat sink assembly of the present invention having the above configuration can easily form a cooling path divided into an inlet and an outlet by performing machining on both longitudinal ends of a path integrally formed in the heat sink and by having an end plug close the open surface.

[0023] In addition, the heat sink assembly of the present invention can also secure excellent structural rigidity by manufacturing the heat sink as a continuum through extrusion molding.

[0024] Furthermore, the heat sink assembly of the present invention includes a flow guide on the return path where the refrigerant flow rapidly switches, thereby making the flow rate of the refrigerant introduced into each of the multiple outlet paths more uniform. This allows for uniform cooling performance to be maintained across the entire area of ​​the heat sink assembly, and significantly reduces the possibility of secondary batteries located in areas where cooling is locally vulnerable to problems such as performance degradation or thermal runaway.

[0025] However, the technical effects that can be obtained through the present invention are not limited to the above-described effects, and other effects that are 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 idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0027] FIG. 1 is a drawing illustrating a heat sink assembly according to one embodiment of the present invention.

[0028] Figure 2 is an exploded perspective view of the heat sink assembly of Figure 1.

[0029] Figure 3 is a drawing showing the structure of a heat sink in detail.

[0030] Figure 4 is an enlarged view of part “A” of Figure 1.

[0031] Figure 5 is an enlarged view of part “B” of Figure 1.

[0032] Figure 6 is a drawing illustrating the overall refrigerant flow in the heat sink assembly of Figure 1.

[0033] FIG. 7 is a drawing illustrating a return path according to one embodiment of the present invention.

[0034] The present invention can be modified in various ways and has many embodiments, and specific embodiments will be described in detail below.

[0035] However, this is not intended to limit the present invention to a specific embodiment, but should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

[0036] In the present invention, it should be understood that terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0037] Additionally, 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 "directly 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 "directly below" the other part, but also cases where there is another part in between. Furthermore, in the present application, "being placed on" may include cases where it is placed below as well as above.

[0038]

[0039] The present invention relates to a heat sink assembly, and in one example, includes a heat sink having a plurality of ribs integrally formed along an internal longitudinal direction, first and second sides of both longitudinal ends being open, and first and second end plugs that close the first and second sides of both ends of the heat sink, respectively, wherein the heat sink has a cooling path through which refrigerant introduced from the first end plug side flows along an inlet path, changes direction along a return path from the second end plug side, is introduced into an outlet path, and then flows toward the first end plug side, and the second end plug has a flow guide on a return path that is converted from the inlet path to the outlet path.

[0040] The heat sink assembly of the present invention having the above configuration can easily form a cooling path divided into an inlet and an outlet by performing machining on both longitudinal ends of a path integrally formed in the heat sink and by having an end plug close the open surface.

[0041] In addition, the heat sink assembly of the present invention can also secure excellent structural rigidity by manufacturing the heat sink as a continuum through extrusion molding.

[0042] Furthermore, the heat sink assembly of the present invention includes a flow guide on the return path where the refrigerant flow rapidly switches, thereby making the flow rate of the refrigerant introduced into each of the multiple outlet paths more uniform. This allows for uniform cooling performance to be maintained across the entire area of ​​the heat sink assembly, and significantly reduces the possibility of secondary batteries located in areas where cooling is locally vulnerable to problems such as performance degradation or thermal runaway.

[0043] Hereinafter, a specific embodiment 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 / right, etc., used to designate relative positions in the following description are intended to aid understanding of the invention, and unless otherwise specifically defined, the directions shown in the drawings are taken as a reference.

[0044]

[0045] [First Embodiment]

[0046] FIG. 1 is a drawing illustrating 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) of FIG. 1, and FIG. 3 is a drawing illustrating in detail the structure of the heat sink (100), particularly the structure of the internal flow path (140).

[0047] The heat sink assembly (10) of the present invention includes a heat sink (100) having a pair of open surfaces facing each other, and first and second end plugs (200). The open surfaces of the heat sink (100) are surfaces located at both ends in the longitudinal direction (L), and for convenience of explanation, the two open surfaces are referred to as a first surface (120) and a second surface (130), respectively. Here, the longitudinal direction (L) refers to a direction in which a plurality of flow paths (140), which are hollow portions, extend, and the width direction (W) is defined as a direction orthogonal to the longitudinal direction (L) on a plane in which the plurality of flow paths (140) are spaced apart from each other.

[0048] A plurality of flow paths (140) through which refrigerant flows are hollow portions formed along the longitudinal direction (L), and the flow paths (140) are separated by ribs (110). The first surface (120) and the second surface (130) of both ends of the heat sink (100) along the longitudinal direction (L) are open. The heat sink (100) can be manufactured as an extruded product in which a plurality of flow paths (140) are integrally molded along the internal longitudinal direction (L) through extrusion molding. For example, FIGS. 1 and 2 illustrate one embodiment of a heat sink (100) manufactured by extrusion molding.

[0049] The first and second end plugs (200) close the open first side (120) and second side (130) at both ends of the heat sink (100), respectively, and organically connect a plurality of flow paths (140) separated from each other within the heat sink (100) to form a refrigerant inflow and outflow path. The refrigerant inflow and outflow path formed by the first and second end plugs (200) will be described in detail with reference to FIGS. 3 to 7.

[0050] Here, the illustrated embodiment presents as an example a heat sink (100) having a structure in which both ends in the longitudinal direction (L) are open due to the nature of an extruded product. However, even in the case of a heat sink (100) not manufactured by extrusion molding, if it is a heat sink (100) having a structure in which both ends in the longitudinal direction (L) form open surfaces through which a plurality of flow paths (140) extend, it will be possible to configure the heat sink assembly (10) of the present invention in the same manner as combining the first and second end plugs (200).

[0051] Fig. 3 illustrates in more detail the structure of the flow path (140) inside the heat sink (100). A plurality of flow paths (140) extending in the longitudinal direction (L) between the first surface (120) and the second surface (130) have their ends spaced apart from the first surface (120) and the second surface (130) by a predetermined distance. The distance at which the flow paths (140) are spaced apart from the first surface (120) and the second surface (130) can be freely designed by a cutting process that mechanically removes the rib (110) that divides the flow paths (140), which are hollow portions. By the cutting process that removes a portion of the end of the rib (110), a space (depth) into which the end plug (200) is inserted is secured.

[0052] The first and second end plugs (200) close the open first surface (120) and second surface (130) at both ends of the heat sink (100), respectively. The end plugs (200) have a thickness and width suitable for insertion onto the first surface (120) and second surface (130) of the heat sink (100). The end plugs (200) inserted into the heat sink (100) can be sealed by welding, for example, friction stir welding. For example, if the welding depths of the friction stir welding performed on the upper and lower surfaces of the heat sink (100) overlap each other, welding surfaces are formed in the upper, lower, left, and right directions of the end plugs (200), thereby completing the sealing of the heat sink (100) by the end plugs (200).

[0053] Since a plurality of flow paths (140) extend in the longitudinal direction (L) and the first side (120) and the second side (130) are sealed by the first and second end plugs (200), the refrigerant can be configured to flow over the entire heat transfer area of ​​the heat sink assembly (10) by appropriately selecting the positions of the ports through which the refrigerant flows in and out. In the illustrated embodiment, an inlet port (213) through which the refrigerant flows in and an outlet port (215) through which the refrigerant flows out are arranged together on the first side (120), and a second end plug (220) is arranged on the second side (130) to form a return flow path (146) of the refrigerant without a separate port.

[0054] FIG. 4 is an enlarged view of part "A" of FIG. 1, and when viewed together with FIG. 3, the inlet flow path (142) connected to the inlet port (213) is arranged in the central region of the heat sink (100), and the outlet flow paths (144) connected to the outlet ports (215) provided in pairs are arranged on both sides of the inlet flow path (142). In the illustrated embodiment, two inlet flow paths (142) are provided, and the ends of the inlet flow paths (142) are connected to return flow paths (146) formed long along the second surface (130), and the long return flow paths (146) are connected to the outlet flow paths (144) on both sides.

[0055] In one embodiment of the present invention, the first end plug (210) for closing the first side (120) includes an inlet plug (211) for closing the first side (120) of the inlet passage (142), and a pair of outlet plugs (212) for closing the first side (120) of the outlet passage (144). A certain space is formed between the inlet plug (211) and the inlet of the inlet passage (142), and an inlet port (213) is arranged on this space. Accordingly, the refrigerant flowing into the inlet port (213) fills the space on the upstream side of the inlet passage (142) and then branches out and flows evenly to each inlet passage (142). Similarly, an outlet port (215) is arranged on the space formed between the outlet plug (212) and the outlet of the outlet passage (144).

[0056] FIG. 5 is an enlarged view of part "B" of FIG. 1, showing a return flow path (146). The second side (130) of the heat sink (100) is closed by a second end plug (220), and the ends of each flow path (142, 144), i.e., the outlet of the inlet flow path (142) and the inlet of the outlet flow path (144) facing the second side (130), are also spaced apart from the second end plug (220) by a predetermined distance, and the space formed along the second end plug (220) thus forms the return flow path (146). In the exemplary embodiment of FIG. 5, the return flow path (146) is shown as having a constant distance from the second side (130), i.e., no substantial change in cross-sectional area.

[0057] And, as specifically shown in FIG. 5, the second end plug (220) has a flow guide (230) on the return path (146) that switches from the inlet path (142) to the outlet path (144). In the illustrated embodiment, the flow guide (230) has a shape of a protrusion protruding from the surface of the second end plug (220). The role of this flow guide (230) is to sufficiently secure the flow rate of the refrigerant introduced into the outlet path (144) closest to the inlet path (142), i.e., the first outlet path (144-1).

[0058] The refrigerant flowing out of the outlet of the inlet passage (142) is rapidly diverted to the return passages (146) on both sides after colliding with the second end plug (220). The refrigerant diverted toward the return passage (146) is sequentially introduced into the inlets of each of the outlet passages (144) arranged sequentially, starting from the first outlet passage (144-1). Ideally, the flow rate of the refrigerant introduced into each outlet passage (144) is most desirable to be uniform, but in reality, it is not uniform.

[0059] In particular, the problem is that the flow rate of the refrigerant introduced into the first outlet passage (144-1) closest to the inlet passage (142) drops significantly. The refrigerant flow around the first outlet passage (144-1) is most unstable immediately after the refrigerant flow is turned nearly 90° by hitting the second end plug (220). Due to this unstable flow pattern, a sufficient amount of refrigerant tends not to be introduced into the first outlet passage (144-1). In more severe cases, a backflow phenomenon of the refrigerant may occur in the first outlet passage (144-1) due to a pressure drop caused by strong turbulent flow.

[0060] The flow guide (230) provided in the second end plug (220) is intended to solve the problem of flow distribution, and particularly serves to promote the flow of refrigerant toward the first outlet passage (144-1) where the flow rate is the least sufficient and unstable. To this end, the flow guide (230) is arranged to face the first outlet passage (144-1) closest to the inlet passage (142) among the paths that transition from the inlet passage (142) to the return passage (146). By the flow guide (230) arranged to face the entrance of the first outlet passage (144-1), some of the refrigerant that has changed direction toward the return passage (146) is forced to flow toward the first outlet passage (144-1) after hitting the flow guide (230).

[0061] For effective refrigerant direction change, the flow guide (230) may be provided with an inclined surface (232) that guides the refrigerant, which has changed direction from the inlet passage (142) to the return passage (146), to flow toward the first outlet passage (144-1). In addition, in order for the refrigerant, which has changed direction toward the first outlet passage (144-1), to smoothly flow into the first outlet passage (144-1), the inclined surface (232) of the flow guide (230) may be arranged between the beginning and the center point along the width direction (W) of the first outlet passage (144-1). For example, as illustrated in the partially enlarged view of FIG. 5, the apex (234) of the inclined surface (232) of the flow guide (230) may be located at the center point in the width direction (W) of the first outlet passage (144-1). By directing the flow of refrigerant toward the first outlet passage (144-1) toward the center of the inlet of the first outlet passage (144-1), effective refrigerant inflow can be achieved.

[0062] FIG. 6 is a drawing illustrating the overall refrigerant flow in the heat sink assembly (10) of FIG. 1. As described above, on the first surface (120) of the heat sink (100), the inlet flow path (142) connected to the inlet port (213) is arranged in the central region of the heat sink (100), and the outlet flow paths (144) connected to the outlet ports (215) provided in pairs are arranged on both sides of the inlet flow path (142). In addition, on the second surface (130) of the heat sink (100), the second end plug (220) forms a return flow path (146).

[0063] Due to the arrangement structure of this flow path (140), the refrigerant introduced into the inlet port (213) on the side of the first end plug (210) flows along the central inlet flow path (142) and then changes direction along the return flow path (146) on the side of the second end plug (220). The refrigerant whose direction has been changed flows along the return flow path (146) and is sequentially introduced into the outlet flow path (144), and the refrigerant flowing along the outlet flow path (144) is discharged to the outside through the outlet port (215) on the side of the first end plug (210).

[0064] And, when the refrigerant flowing through the return path (146) is introduced into each outlet path (144), the flow rate of the first outlet path (144-1), where the refrigerant flow was the most insufficient, is secured well by the flow guide (230) provided in the second end plug (220). With the help of this flow guide (230), the flow rate of the refrigerant flowing through each outlet path (144) becomes more uniform than before, and the refrigerant flows at a uniform flow rate over the entire area of ​​the heat sink (100), so that uniform cooling characteristics that are not concentrated in a specific area can be obtained.

[0065]

[0066] [Second Embodiment]

[0067] In the first embodiment, the present invention was described focusing on the configuration of the second end plug (220) for securing a flow rate for the first outlet passage (144-1), where a reverse flow of refrigerant may occur on the return passage (146). In the second embodiment, an additional configuration capable of more evenly inducing the flow rate of refrigerant introduced into each outlet passage (144) is described.

[0068] The refrigerant flowing through the return path (146) is sequentially distributed into a plurality of consecutive outlet paths (144) starting from the first outlet path (144-1). Since the flow rate of the refrigerant flowing out from the outlet of the inlet path (142) is almost constant, the refrigerant flow is not smooth in the first outlet path (144-1) due to the flow characteristics, but since the refrigerant is generally distributed first toward the outlet path (144) adjacent to the inlet path (142), the refrigerant flow rate tends to decrease as it goes downstream of the return path (146). The second embodiment relates to a configuration for resolving or alleviating such uneven distribution of the flow rate.

[0069] FIG. 7 is a drawing illustrating a return path (146) according to a second embodiment. Referring to FIG. 7, the space between the surface of the second end plug (220) and the inlet of each outlet path (144) is configured to become wider as it goes from the first outlet path (144-1) to the outlet path (144) that is gradually spaced apart from the inlet path (142). The space between the surface of the second end plug (220) and the inlet of each outlet path (144) is determined by the length of the rib (110) on the second surface (130) that forms the inlet of the outlet path (144). That is, the configuration of FIG. 7 can be implemented by adjusting the cutting depth of the end of the rib (110) of the outlet path (144) that is mechanically processed through the second surface (130).

[0070] In the illustrated embodiment, the distance between the end of the rib (110) forming each outlet channel (144) and the surface of the second end plug (220) is configured to linearly increase as one moves from the first outlet channel (144-1) to the outer outlet channel (144). As the distance between the end of the rib (110) and the surface of the second end plug (220) increases linearly, the space between the surface of the second end plug (220) and the inlet of each outlet channel (144) linearly expands as one moves away from the inlet channel (142).

[0071] By this configuration, when the space between the surface of the second end plug (220) and the inlet of each outlet passage (144) is narrow, a small amount of refrigerant is introduced into the outlet passage (144) as the flow rate is fast, and on the other hand, when the space is wide, a sufficient amount of refrigerant is introduced into the outlet passage (144) for a longer period of time as the flow rate is slow.

[0072] Accordingly, the flow rate for the first outlet flow path (144-1) is secured by the flow guide (230) of the second end plug (220), and by implementing differential flow rate distribution in consideration of the distance from the outlet of the inlet flow path (142), the flow rate distributed to the entire outlet flow path (144) becomes more uniform, and through this, the cooling performance of the heat sink assembly (10) can also be exhibited evenly over the entire area.

[0073]

[0074] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

[0075]

[0076] [Explanation of symbols]

[0077] 10: Heatsink assembly 100: Heatsink

[0078] 110: Rib 120: First side

[0079] 130: Page 2 140: Euro

[0080] 142: Inlet Euro 144: Outlet Euro

[0081] 144-1: 1st outlet euro 146: Return euro

[0082] 200: End plug 210: First end plug

[0083] 211: Inlet plug 212: Outlet plug

[0084] 213: Inlet port 215: Outlet port

[0085] 220: Second end plug 230: Flow guide

[0086] 232: Slope 234: Vertex

[0087] L: length direction W: width direction

Claims

1. A heat sink in which a plurality of ribs are integrally formed along the internal longitudinal direction and the first and second sides of the longitudinal ends are open; and First and second end plugs for closing first and second sides of the heat sink, respectively; Including, The above heat sink, A cooling path is provided in which the refrigerant introduced from the first end plug side flows along the inlet path, changes direction along the return path from the second end plug side, is introduced into the outlet path, and then flows toward the first end plug side. The above second end plug, A heat sink assembly having a flow guide on a return path that transitions from the inlet path to the outlet path.

2. In paragraph 1, In the above first end plug, A heat sink assembly having an inlet port through which the refrigerant flows in and an outlet port through which the refrigerant flows out.

3. In paragraph 2, The inlet euro connected to the above inlet port is placed in the central area of ​​the above heat sink, A heat sink assembly, wherein the outlet ports are provided in pairs, and outlet channels connected to the outlet ports are arranged on both sides of the inlet channels.

4. In paragraph 3, The above first end plug, An inlet plug that closes the first side of the inlet euro, A heat sink assembly comprising a pair of outlet plugs closing the first side of the outlet euro.

5. In paragraph 1, The above fluid guide is, A heat sink assembly having a shape of a protrusion protruding from the surface of the second end plug.

6. In paragraph 5, The above fluid guide is, A heat sink assembly, which is arranged facing the first outlet flow path that is closest to the inlet flow path among the paths that transition from the inlet flow path to the return flow path.

7. In paragraph 6, The above fluid guide is, A heat sink assembly having an inclined surface that guides the refrigerant, which has been diverted from the inlet passage to the return passage, toward the first outlet passage.

8. In paragraph 4, The slope of the above fluid guide is, A heat sink assembly positioned between the inlet and the center point along the width direction of the first outlet euro.

9. In paragraph 8, The vertex of the inclined surface of the above fluid guide, A heat sink assembly located at the center point of the width direction of the first outlet euro.

10. In paragraph 6, A heat sink assembly, wherein the space between the second end plug surface and the inlet of each outlet passage becomes wider as it goes from the first outlet passage to the outlet passage that is gradually spaced apart from the inlet passage.

11. In paragraph 10, A heat sink assembly, wherein, as the distance between the end of the rib forming each outlet flow path and the surface of the second end plug increases linearly from the first outlet flow path to the outlet flow path that is gradually spaced apart from the inlet flow path.

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