Battery pack with improved cooling performance of terminal bus bar

Abstract

A heat sink assembly disclosed herein comprises: a heat sink in which a plurality of ribs are integrally formed along an inner longitudinal direction by extrusion molding, a space between the ribs forms a refrigerant flow path, and a first surface and a second surface at both ends in the longitudinal direction are open; and an end plug closing the first and second surfaces at both ends of the heat sink, wherein the upper surface of the heat sink is provided with a first heat transfer material protruding so as to come into contact with the bottom surface of a terminal bus bar provided in a battery module to be mounted on the heat sink.

Description

Battery pack with improved cooling performance of terminal busbar

[0001] The present invention relates to a battery pack, and more particularly, to a battery pack capable of reducing the temperature deviation of maximum heat generation occurring at a terminal bus bar, which is an end of an electrical connection between battery cells, during rapid charging.

[0002] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2023-0104024, dated August 9, 2023, the entire contents of which are incorporated herein by reference.

[0003] Secondary batteries, which offer high applicability across a wide range of product categories and possess electrical properties such as high energy density, are widely used not only in portable devices but also in electric vehicles (EVs) and hybrid electric vehicles (HEVs) powered by electrical power sources. These batteries are attracting attention as a new energy source for environmental friendliness and energy efficiency, not only because they can dramatically reduce fossil fuel use, but also because they produce no byproducts from energy use.

[0004] Currently, widely used types of secondary batteries include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of each of these secondary batteries, or battery cells, is approximately 2.5 to 4.5 V. Therefore, if a higher output voltage is required, multiple battery cells are connected in series to form a battery pack. Furthermore, depending on the required charge / discharge capacity of the battery pack, multiple battery cells are connected in parallel to form a battery pack. Therefore, the number of battery cells and their electrical connections in a battery pack can be designed in various ways depending on the required output voltage or charge / discharge capacity.

[0005] Meanwhile, when configuring a battery pack by connecting multiple battery cells in series and / or parallel, it is common to first configure a battery module or unit including at least one battery cell, electrically connect the battery modules or units, and add other components, such as a temperature sensor, a BMS, and a venting device, to configure the battery pack.

[0006] To ensure stable performance and longevity of a battery pack, it is crucial that the multiple battery cells housed within the pack exhibit consistent performance. The temperature difference between cells is used as an indicator to assess this. The temperature of a battery cell during charging and discharging can be used to determine whether the cell is operating normally. Consequently, a significant temperature difference between cells indicates a quality issue within the battery pack. Therefore, battery pack quality control (QC) includes specifications for cell temperature difference as an evaluation item.

[0007] Temperature variations in battery cells are often problematic, especially during rapid charging, when maximum heat generation occurs at the terminal busbar, the terminal of the electrical connection between battery cells. When maximum heat generation occurs at the terminal busbar, a temperature difference occurs between battery cells adjacent to the terminal busbar and those further away from it. Therefore, to pass quality control, concentrated cooling of the terminal busbar, the area where high temperatures occur, is necessary.

[0008] The purpose of the present invention is to reduce the temperature difference between battery cells by providing concentrated cooling to a terminal bus bar, which is the end of an electrical connection between battery cells, and thereby improve the performance of a battery pack.

[0009] 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.

[0010] The present invention relates to a heat sink assembly, and in one example, the heat sink comprises a plurality of ribs integrally formed along an internal longitudinal direction by extrusion molding, a space between the ribs forming a refrigerant flow path, a first side and a second side at both longitudinal ends being open, and an end plug closing the first and second sides at both ends of the heat sink, and a first heat transfer material protruding on an upper surface of the heat sink so as to contact a bottom surface of a terminal bus bar provided in a battery module to be mounted on the heat sink.

[0011] In one embodiment of the present invention, the first heat transfer material is provided in a trench forming a concave space on the upper surface of the heat sink.

[0012] The above trench can be formed along the length of the heat sink.

[0013] A fin structure is provided on the bottom surface of the trench, and the first heat transfer material can be fixed on the fin structure.

[0014] Below the bottom surface of the trench, an inlet path for introducing cooling water into the heat sink may be located.

[0015] And, the inlet euro includes an expansion euro protruding above the upper surface of the heat sink, and the trench can share a side wall with the expansion euro.

[0016] Meanwhile, the present invention provides a battery pack including a heat sink assembly having the above-described configuration and at least one battery module mounted on an upper surface of the heat sink assembly, wherein heat generated from a terminal bus bar provided in the battery module is transferred to the first heat transfer material in a conductive heat transfer manner.

[0017] According to an embodiment, the terminal bus bar may include a second heat transfer material provided on the surface thereof and a heat conductive member in contact with the second heat transfer material, and heat generated in the terminal bus bar is transferred to the first heat transfer material in the form of conductive heat transfer via the second heat transfer material and the heat conductive member.

[0018] In addition, the present invention provides a battery pack including a heat sink assembly including a trench that accommodates the first heat transfer material, and at least one battery module mounted on an upper surface of the heat sink assembly, wherein a bottom surface of a terminal bus bar provided in the battery module contacts the first heat transfer material provided in the trench, and thus heat generated in the terminal bus bar is transferred to the first heat transfer material in a conductive heat transfer manner.

[0019] Here, the trench is formed to extend in the longitudinal direction from the central area in the width direction of the heat sink, and the battery modules provided in multiple units are aligned and mounted such that each terminal bus bar faces the trench, and at least a portion of an inlet path through which cooling water flows into the inside of the heat sink can overlap with the trench.

[0020] According to an embodiment of the present invention having the above configuration, when a battery module is mounted on a heat sink, heat generated from a terminal bus bar provided in the battery module is transferred to the first heat transfer material in the form of conductive heat transfer, and ultimately, the heat of the terminal bus bar is released to the outside through cooling water flowing inside the heat sink.

[0021] In this way, the heat sink assembly of the present invention helps to maintain the temperature of the battery cells uniformly by actively absorbing and dissipating the heat of the terminal bus bar, which has a significant influence on the temperature deviation between multiple battery cells, thereby improving the quality of the battery pack.

[0022] 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.

[0023] 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.

[0024] FIG. 1 is a drawing illustrating a heat sink assembly according to one embodiment of the present invention.

[0025] Figure 2 is an exploded perspective view of the heat sink assembly.

[0026] Figure 3 is a cross-sectional view showing the structure of a trench.

[0027] Figure 4 is a cross-sectional view showing another embodiment of a trench.

[0028] FIG. 5 is a drawing illustrating one embodiment of an inlet euro of a heat sink.

[0029] FIG. 6 is a drawing illustrating one embodiment in which a battery module is mounted on the heat sink assembly of FIG. 1.

[0030] FIG. 7 is a drawing illustrating one embodiment in which a terminal bus bar contacts a heat transfer material inside a trench.

[0031] FIG. 8 is a drawing illustrating another embodiment in which a terminal bus bar is thermally connected to a heat transfer material on the upper surface of a heat sink.

[0032] The present invention can be modified in various ways and has many embodiments, and specific embodiments will be described in detail below.

[0033] 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.

[0034] 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.

[0035] 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.

[0036]

[0037] The present invention relates to a heat sink assembly, and in one example, the heat sink comprises a plurality of ribs integrally formed along an internal longitudinal direction by extrusion molding, a space between the ribs forming a refrigerant flow path, a first side and a second side at both longitudinal ends being open, and an end plug closing the first and second sides at both ends of the heat sink, and a first heat transfer material protruding on an upper surface of the heat sink so as to contact a bottom surface of a terminal bus bar provided in a battery module to be mounted on the heat sink.

[0038] Accordingly, when a battery module is mounted on a heat sink, heat generated from a terminal bus bar provided in the battery module is transferred to the first heat transfer material by means of conductive heat transfer, and ultimately, the heat of the terminal bus bar is released to the outside through cooling water flowing inside the heat sink.

[0039] In this way, the heat sink assembly of the present invention helps to maintain the temperature of the battery cells uniformly by actively absorbing and dissipating the heat of the terminal bus bar, which has a significant influence on the temperature deviation between multiple battery cells, thereby improving the quality of the battery pack.

[0040] Hereinafter, a specific embodiment of a battery pack (10) according to 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 specified, the directions depicted in the drawings are taken as a reference.

[0041]

[0042] [First Embodiment]

[0043] FIG. 1 is a drawing illustrating one embodiment of a heat sink assembly (100) for a battery pack (10) of the present invention, and FIG. 2 is an exploded perspective view of the heat sink assembly (100). The heat sink assembly (100) of the present invention includes a heat sink (110) manufactured by extrusion molding and a plurality of end plugs (150).

[0044] The heat sink (110) is a main body-like structure manufactured as a continuous body through extrusion molding, and a plurality of ribs (112) are integrally molded along the internal longitudinal direction (L). The heat sink (110) can be prepared by cutting an extruded product manufactured as a continuous body to a designed length.

[0045] A plurality of ribs (112) are arranged at appropriate intervals along the width direction (W), and each space between the ribs (112) functions as a flow path (120) (refrigerant passage) through which a refrigerant (coolant, etc.) flows. In addition, if the surfaces formed by the longitudinal ends (L) of the heat sink (110) are respectively referred to as the first surface (130) and the second surface (132), the first surface (130) and the second surface (132) are open. That is, the ribs (112) formed inside the heat sink (110) can be accessed through the first surface (130) and the second surface (132).

[0046] Here, the longitudinal direction (L) refers to the extrusion molding direction of the heat sink (110), i.e., the direction in which the ribs (112) extend, and the width direction (W) refers to the direction orthogonal to the longitudinal direction (L) in which a plurality of ribs (112) are spaced apart from each other.

[0047] A plurality of end plugs (150) are coupled to close the first and second faces (130, 132) of both ends of the heat sink (110), respectively. The end plug (150) is composed of an insert (152) inserted into the heat sink (110) and a front face (154) that covers the first face (130) and the second face (132) of the heat sink (110) after coupling. That is, the end plug (150) generally has a shape of the English alphabet "T" when viewed in the width direction (W). The front face (154) of the end plug (150) has a shape corresponding to the outline of the first and second faces (130, 132), and the insert (152) has a shape that fits perfectly into the internal space of the heat sink (110).

[0048] In order to form a space into which the insert (152) of the end plug (150) is inserted and to form a flow path for the refrigerant flowing in and out of the heat sink (110), a plurality of ribs (112) are machined to cut off portions of both ends. Referring to one embodiment illustrated in FIG. 2, an inlet port (134) through which the refrigerant flows in and out and an outlet port (136) through which the refrigerant flows out are arranged on the first surface (130) of the heat sink (110), and for this purpose, three end plugs (150) are coupled. That is, one inlet plug (156) is coupled to the center of the heat sink (110), and one outlet plug (157) is coupled to each of its two sides. In addition, one return plug (158) is coupled to the second surface (132) to form a return path (126) for the refrigerant.

[0049] The central flow path (120) assigned to the inlet plug (156) forms the inlet flow path (122), and the refrigerant that hits the return plug (158) of the second surface (132) flows into the outlet flow paths (124) on the left and right of the inlet flow path (122), which are formed by two outlet plugs (157). In order for the refrigerant supplied through the inlet port (134) to be uniformly introduced into the plurality of inlet flow paths (122), a flow space is formed between the insert (152) of the inlet plug (156) and the end of the rib (112). Similarly, flow spaces are also formed in the return plug (158) and the outlet plug (157), and this flow space between the end plug (150) and the rib (112) is formed through machining (e.g., milling) that cuts both ends of the rib (112).

[0050] On the upper surface of the heat sink (110), a first heat transfer material (160) is provided so as to protrude so as to contact the bottom surface of the terminal bus bar (212) provided in the battery module (200) to be mounted on the heat sink (110). That is, the first heat transfer material (160) provided on the upper surface of the heat sink (110) protrudes so as to be able to contact the bottom surface of the terminal bus bar (212) corresponding to the mounting position of the battery module (200).

[0051] The first heat transfer material (160) absorbs the heat of the terminal bus bar (212) in the form of conductive heat transfer and transfers it to the heat sink (110). Therefore, the first heat transfer material (160) must be a material with excellent thermal conductivity for smooth heat dissipation. For example, the first heat transfer material (160) can apply various heat transfer enhancing materials called TIM (Thermal Interface Material), filler, etc. The first heat transfer material (160) can be curable or non-curable.

[0052] When a battery module (200) is mounted on a heat sink (110), heat generated from a terminal bus bar (212) provided in the battery module (200) is transferred to a first heat transfer material (160) by means of conductive heat transfer, and ultimately, the heat of the terminal bus bar (212) is released to the outside through a refrigerant (coolant) flowing inside the heat sink (110).

[0053] In this way, the heat sink assembly (100) of the present invention helps to maintain the temperature of the battery cells uniformly by effectively absorbing and discharging the heat of the terminal bus bar (212), which has a great influence on the temperature deviation between multiple battery cells, such as when maximum heat generation occurs during rapid charging and discharging, thereby improving the quality of the battery pack (10).

[0054] As exemplarily illustrated in the drawing, the first heat transfer material (160) is provided in a trench (140) that forms a concave space on the upper surface of the heat sink (110). As shown in FIG. 3, the trench (140) forms a narrow and long ditch-shaped receiving space, and the first heat transfer material (160) is filled in the space within the trench (140). The trench (140) stably fixes the position of the first heat transfer material (160) even when the first heat transfer material (160) is fluid. Therefore, the trench (140) functions as a structure that reliably ensures that the first heat transfer material (160) contacts the terminal bus bar (212).

[0055] The trench (140) can be formed continuously along the longitudinal direction (L) of the heat sink (110). As described above, the longitudinal direction (L) of the heat sink (110) corresponds to the extrusion molding direction of the heat sink (110), and the trench (140) can also be formed integrally with the heat sink (110) through extrusion molding together with the rib (112) forming the flow path (120). In addition, as will be described later, when a plurality of battery modules (200) are mounted on the heat sink assembly (100), the terminal bus bars (212) of each battery module (200) can be aligned to face the trench (140).

[0056] Fig. 4 is a cross-sectional view illustrating another embodiment of a trench (140). In the embodiment of Fig. 4, a fin structure (142) is provided on the bottom surface of the trench (140). The fin structure (142) may form multiple rows and may be integrally formed with the trench (140) during extrusion molding of the heat sink (110). The fin structure (142) not only provides a large contact area for fixing the first heat transfer material (160), but also provides an expanded heat conduction area. Therefore, the trench (140) structure provided with the fin structure (142) may be more effective in heat dissipation of the terminal bus bar (212).

[0057] And, as illustrated in FIGS. 3 and 4, an inlet passage (122) through which cooling water flows into the inside of the heat sink (110) may be positioned below the bottom surface of the trench (140). Since the passage (120) inside the heat sink (110) overlaps the trench (140) at least partially vertically, the heat of the first heat transfer material (160) fixed in the trench (140) can be more effectively released to the cooling water. In particular, it may be more preferable that the passage (120) that overlaps the trench (140) vertically is the inlet passage (122). Since the cooling water flowing in the inlet passage (122) is relatively lower in temperature than the cooling water of the outlet passage (124), more smooth cooling of the terminal bus bar (212) can be expected.

[0058] FIG. 5 is a drawing illustrating one embodiment of an inlet passage (122) of a heat sink (110). In the embodiment of FIG. 5, the inlet passage (122) includes an expansion passage (122-1) protruding above the upper surface of the heat sink (110). That is, with respect to the upper surface of the heat sink (110), the inlet passage (122) extends above and below the upper surface. For example, the cross-sectional shape of the inlet passage (122) may form an “inverted T” shape of the English alphabet. In addition, the expansion passage (122-1) protruding above the upper surface of the heat sink (110) and the trench (140) may share one side wall with each other. As the inlet duct (122) includes the expansion duct (122-1), the flow rate of the refrigerant increases, and as there is an expansion of the heat conduction area through the shared side wall, the embodiment of FIG. 5 can result in further improved cooling of the terminal bus bar (212).

[0059]

[0060] [Second Embodiment]

[0061] FIG. 6 is a drawing illustrating one embodiment in which a battery module (200) is mounted on the heat sink assembly (100) described in the first embodiment. FIG. 6 exemplarily illustrates that one battery module (200) is mounted on the heat sink assembly (100), but a battery pack (10) is completed by densely packing a number of battery modules (200) corresponding to the mounting area of ​​the heat sink assembly (100).

[0062] The battery pack (10) provided by the present invention includes a heat sink assembly (100) having a configuration as described above, and at least one battery module (200) mounted on the upper surface of the heat sink assembly (100). In addition, heat generated from a terminal bus bar (212) provided in the battery module (200) is transferred to a first heat transfer material (160) provided on the upper surface of the heat sink assembly (100) by means of conductive heat transfer.

[0063] FIG. 7 is a drawing illustrating one embodiment in which a terminal bus bar (212) contacts a first heat transfer material (160) within a trench (140). A trench (140) is provided on the upper surface of a heat sink assembly (100) to form a space in which a first heat transfer material (160) is fixed, and when a battery module (200) is mounted at a predetermined position on the upper surface of the heat sink assembly (100), a bottom surface of a terminal bus bar (212) provided in the battery module (200) contacts the first heat transfer material (160) provided within the trench (140). Accordingly, heat generated in the terminal bus bar (212) is transferred to the first heat transfer material (160) by conduction heat transfer, and ultimately, the heat of the terminal bus bar (212) is released to the outside by a refrigerant flowing within the heat sink assembly (100).

[0064] The battery module (200) includes a busbar frame assembly (210) having a plurality of terminal busbars (212) for electrically connecting leads of a plurality of battery cells. The busbar frame assembly (210) includes a main frame (214) to which the terminal busbars (212) are fixed, and a cover (216) for protecting the terminal busbars (212). The battery module (200) is mounted on a heat sink assembly (100) in a direction in which the busbar frame assembly (210) faces the trench (140).

[0065] The terminal bus bar (212) has its bottom surface exposed to the bus bar frame assembly (210), and the bottom surface of the exposed terminal bus bar (212) contacts the first heat transfer material (160) provided in the trench (140), so that heat generated in the terminal bus bar (212) is transferred to the first heat transfer material (160) by means of conductive heat transfer.

[0066] Here, the trench (140) may be formed to extend along the longitudinal direction (L) from the central region in the width direction (W) of the heat sink (110). That is, the trench (140) may be formed integrally with the rib (112) forming the internal flow path (120) during the extrusion molding process of the heat sink (110). Accordingly, when mounting a plurality of battery modules (200) to the heat sink assembly (100), it becomes easy to align the plurality of battery modules (200) with respect to the trenches (140) formed in a row and to contact the terminal bus bar (212) with the first heat transfer material (160).

[0067] In addition, for smooth heat dissipation of the terminal bus bar (212), the inlet path (122) through which coolant flows into the inside of the heat sink (110) may partially overlap the trench (140) in the upper and lower directions. In other words, it may be desirable for the coolant that discharges the heat absorbed by the first heat transfer material (160) to the outside of the battery pack (10) to be adjacent to the lower side of the trench (140).

[0068] In addition, among the internal passages (120) of the heat sink (110), it may be desirable for the inlet passage (122), through which a colder refrigerant flows than the outlet passage (124), to be arranged around the trench (140). For this purpose, the trench (140) and the inlet passage (122) are gathered at the center of the heat sink assembly (100). Another advantage of this arrangement is that when a plurality of battery modules (200) are arranged in two rows along the longitudinal direction (L), the busbar frame assemblies (210) of the battery modules (200) on both sides in the width direction (W) face each other, making it easier to configure electrical connections within the battery pack (10).

[0069] FIG. 8 is a diagram illustrating another embodiment in which a terminal bus bar (212) is thermally connected to a heat transfer material on the upper surface of a heat sink (110). The embodiment of FIG. 8 does not include a trench (140) structure, which illustrates that the first heat transfer material (160) may not be secured by the trench (140). For example, if the first heat transfer material (160) has properties that allow it to maintain a certain degree of shape (e.g., a high-viscosity, curable TIM), the trench (140) structure may not be applied.

[0070] Additionally, as in the exemplary embodiment of FIG. 8, the terminal bus bar (212) may not be in direct contact with the first heat transfer material (160). For example, the terminal bus bar (212) may include a second heat transfer material (162) provided on the surface thereof and a heat conductive member (164) in contact with the second heat transfer material (162). The second heat transfer material (162) may be a curable material so as to structurally support the heat conductive member (164). The heat conductive member (164) may be a metal material having a high heat transfer coefficient, such as aluminum or copper, and the heat conductive member (164) is in contact with the first heat transfer material (160) fixed on the heat sink (110). Accordingly, the heat generated in the terminal bus bar (212) is transferred to the first heat transfer material (160) by way of conductive heat transfer via the second heat transfer material (162) and the heat conductive member (164).

[0071] The embodiment of FIG. 8 can exhibit the advantage of increased design freedom in terms of the mounting position or structure of the battery module (200), the arrangement of the first heat transfer material (160) and / or the trench (140) structure, etc., although the heat conduction resistance increases as the second heat transfer material (162) and the heat conduction member (164) are added to the heat conduction path.

[0072]

[0073] 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.

[0074]

[0075] [Explanation of symbols]

[0076] 10: Battery pack 100: Heatsink assembly

[0077] 110: Heatsink 112: Rib

[0078] 120: Euro 122: Inlet Euro

[0079] 122-1: Extended Euro 124: Outlet Euro

[0080] 126: Return Euro 130: First side

[0081] 132: Second side 134: Inlet port

[0082] 136: Outlet port 140: Trench

[0083] 142: Pin structure 150: End plug

[0084] 152: Insert 154: Front

[0085] 156: Inlet plug 157: Outlet plug

[0086] 158: Return plug 160: First heat transfer material

[0087] 162: Second heat transfer material 164: Heat conducting member

[0088] 200: Battery module 210: Busbar frame assembly

[0089] 212: Terminal busbar 214: Main frame

[0090] 216: Cover L: Lengthwise

[0091] W: width direction

Claims

1. A heat sink in which a plurality of ribs are integrally formed along the internal longitudinal direction by extrusion molding, the space between the ribs forms a refrigerant passage, and the first and second sides of both longitudinal ends are open; and An end plug for closing the first and second sides of the heat sink; Including, On the upper surface of the above heat sink, A heat sink assembly having a first heat transfer material protruding so that the bottom surface of a terminal bus bar provided in a battery module to be mounted on the heat sink is in contact with it.

2. In paragraph 1, The above first heat transfer material is, A heat sink assembly provided in a trench forming a concave space on the upper surface of the heat sink.

3. In paragraph 2, The above trench is, A heat sink assembly formed along the longitudinal direction of the above heat sink.

4. In paragraph 2, A pin structure is provided on the bottom surface of the above trench, A heat sink assembly, wherein the first heat transfer material is fixed on the fin structure.

5. In paragraph 2, Below the bottom of the above trench, A heat sink assembly having an inlet path through which coolant flows into the heat sink.

6. In paragraph 5, The above inlet euro includes an expansion euro protruding above the upper surface of the heat sink, The above trench is a heat sink assembly that shares a side wall with the above expansion fin.

7. A heat sink assembly according to any one of paragraphs 1 to 6; and At least one battery module mounted on the upper surface of the heat sink assembly; Including, A battery pack in which heat generated from a terminal bus bar provided in the above battery module is transferred to the first heat transfer material by means of conductive heat transfer.

8. In paragraph 7, A second heat transfer material provided on the surface of the terminal bus bar, A heat-conducting member in contact with the second heat-conducting material is included, A battery pack in which heat generated from the terminal bus bar is transferred to the first heat transfer material by means of conductive heat transfer via the second heat transfer material and the heat conductive member.

9. A heat sink assembly according to any one of paragraphs 2 to 6; and At least one battery module mounted on the upper surface of the heat sink assembly; Including, A battery pack, wherein the bottom surface of the terminal bus bar provided in the battery module is in contact with the first heat transfer material provided in the trench, and thus heat generated in the terminal bus bar is transferred to the first heat transfer material by means of conductive heat transfer.

10. In paragraph 9, The above trench is formed to extend along the length direction from the central area in the width direction of the above heat sink, The battery modules, which are provided in multiple units, are aligned and mounted so that each terminal bus bar faces the trench. A battery pack, wherein at least a portion of the inlet path through which coolant flows into the heat sink overlaps the trench.

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