Battery pack with improved terminal busbar cooling performance

Abstract

The disclosed heat sink assembly includes a heat sink having a plurality of ribs integrally formed inside the heat sink along its longitudinal direction by extrusion molding, where spaces between the ribs form refrigerant flow paths, the heat sink having first and second surfaces open at both longitudinal ends, and end plugs that close the first and second surfaces of the heat sink, and a first heat transfer material protruding from an upper surface of the heat sink so as to come into contact with a bottom surface of a terminal bus bar provided in a battery module attached to the heat sink.

Description

[Technical Field]

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

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0104024, filed on August 9, 2023, and all contents disclosed in the documents of said Korean patent application are incorporated herein by reference. [Background technology]

[0003] Secondary batteries, which are highly adaptable to various products and have 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) that are powered by electrical sources. These secondary batteries are attracting attention as a new energy source that is environmentally friendly and improves energy efficiency because they produce no by-products from energy use, in addition to their primary advantage of dramatically reducing the use of fossil fuels.

[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 such a unit secondary battery, i.e., a battery cell, is approximately 2.5 to 4.5 V. Therefore, if a higher output voltage is required, a battery pack can be constructed by connecting multiple battery cells in series. Alternatively, a battery pack can be constructed by connecting multiple battery cells in parallel depending on the required charge / discharge capacity of the battery pack. Therefore, the number and electrical connections of battery cells included in a battery pack can be variously designed depending on the required output voltage or charge / discharge capacity.

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

[0006] To ensure stable performance and lifespan of a battery pack, it is important that the numerous battery cells housed within the battery pack exhibit uniform performance, and the temperature deviation between battery cells is used as an indicator to evaluate this. The temperature of a battery cell during charging and discharging can be used to confirm that the battery cell is operating normally, and a large temperature deviation between battery cells indicates a problem with the quality of the battery pack. Therefore, specifications for the temperature deviation of battery cells are set as an evaluation item in the quality control (QC) of battery packs.

[0007] Temperature deviations between battery cells often become a problem when the maximum heat is generated from the terminal busbar, which is the end of the electrical connection between battery cells, especially during fast charging. When the maximum heat is generated from the terminal busbar, a temperature deviation occurs between the battery cells adjacent to the terminal busbar and those farther away. Therefore, in order to pass quality control, concentrated cooling of the terminal busbar, which is the high-temperature generating area, is required. Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention aims to reduce the temperature difference between battery cells by centralizing cooling of the terminal bus bars, which are the ends of the electrical connections between the battery cells, thereby improving the performance of the battery pack.

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

[0010] The present invention relates to a heat sink assembly, and in one example, the heat sink includes a plurality of ribs integrally formed inside the heat sink along a longitudinal direction by extrusion molding, wherein spaces between the ribs form refrigerant flow paths, the heat sink having first and second surfaces open at both longitudinal ends, and end plugs that close the first and second surfaces of the heat sink, and a first heat transfer material protruding from an upper surface of the heat sink so as to come into contact with a bottom surface of a terminal bus bar provided in a battery module attached to the heat sink.

[0011] In one embodiment of the present invention, the first thermal transfer material is provided in a trench that forms a recessed space in the upper surface of the heat sink.

[0012] The trench may be formed along the longitudinal direction of the heat sink.

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

[0014] An inlet channel through which cooling water flows into the heat sink may be located below the bottom surface of the trench.

[0015] The inlet channel may include an extension channel protruding above the upper surface of the heat sink, and the trench may share a sidewall with the extension channel.

[0016] Meanwhile, the present invention provides a battery pack including the 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 by conductive heat transfer.

[0017] In some embodiments, the terminal bus bar may include a second heat transfer material provided on a surface thereof and a heat conducting member in contact with the second heat transfer material, and heat generated from the terminal bus bar is transferred to the first heat transfer material by conductive heat transfer via the second heat transfer material and the heat conducting member.

[0018] The present invention also 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, thereby transferring heat generated from the terminal bus bar to the first heat transfer material by conductive heat transfer.

[0019] Here, the trench may be formed in a central region in a width direction of the heat sink and extend along a longitudinal direction thereof, and a plurality of battery modules may be aligned and mounted such that their terminal bus bars face the trench, and at least a portion of an inlet flow path through which coolant flows into the heat sink may overlap the trench. [Effects of the Invention]

[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 by conductive heat transfer, and finally, the heat of the terminal bus bar is dissipated to the outside by coolant flowing inside the heat sink.

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

[0022] However, the technical effects that can be obtained by the present invention are not limited to the effects described above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[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 concept of the present invention, and therefore the present invention should not be interpreted as being limited solely to the matters depicted in such drawings. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a view showing a heat sink assembly according to an embodiment of the present invention; [Figure 2] FIG. 2 is an exploded perspective view of the heat sink assembly. [Figure 3] FIG. 2 is a cross-sectional view showing the structure of a trench. [Figure 4] FIG. 10 is a cross-sectional view illustrating another embodiment of the trench. [Figure 5] 1 illustrates an embodiment of an inlet channel of a heat sink. [Figure 6] 2 is a view showing an embodiment in which a battery module is mounted on the heat sink assembly of FIG. 1; [Figure 7] 10 illustrates an embodiment in which a terminal bus bar contacts a thermally conductive material within a trench. [Figure 8] 10 is a view showing another embodiment in which a terminal bus bar is thermally connected to a heat transfer material on an upper surface of a heat sink. DETAILED DESCRIPTION OF THE INVENTION

[0025] Because the present invention can be modified in various ways and can have various embodiments, specific embodiments will be described in detail below.

[0026] However, this is not intended to limit the invention to any particular embodiment, but rather it can be understood to include all modifications, equivalents, or alternatives falling within the spirit and scope of the invention.

[0027] In the present invention, terms such as "comprise" and "have" are intended to specify the presence of features, numbers, steps, operations, components, parts or combinations thereof described in the specification, and can be understood as not precluding the presence or possibility of addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0028] Furthermore, in the present invention, when a layer, film, region, plate, or other portion is described as being "on" another portion, this includes not only the case where it is "directly on" the other portion, but also the case where there is another portion therebetween. Conversely, when a layer, film, region, plate, or other portion is described as being "under" the other portion, this includes not only the case where it is "directly under" the other portion, but also the case where there is another portion therebetween. Furthermore, in this application, being "located on" can include not only the case where it is located at the top, but also the case where it is located at the bottom.

[0029] The present invention relates to a heat sink assembly, and in one example, the heat sink includes a plurality of ribs integrally formed longitudinally inside the heat sink by extrusion molding, wherein spaces between the ribs form refrigerant flow paths, the heat sink having first and second open surfaces at both ends in the longitudinal direction, and end plugs that close the first and second surfaces at both ends of the heat sink, and a first heat transfer material protruding from an upper surface of the heat sink so as to come into contact with a bottom surface of a terminal bus bar provided in a battery module attached to the heat sink.

[0030] As a result, when a battery module is mounted on the heat sink, heat generated from the terminal bus bar provided in the battery module is transferred to the first heat transfer material by conductive heat transfer, and finally, the heat of the terminal bus bar is released to the outside by the coolant flowing inside the heat sink.

[0031] In this way, the heat sink assembly of the present invention helps to maintain a uniform temperature among the battery cells by actively absorbing and dissipating heat from the terminal bus bars, which has a significant impact on the temperature deviation among multiple battery cells, thereby improving the quality of the battery pack.

[0032] Hereinafter, specific embodiments of the battery pack 10 according to the present invention will be described in detail with reference to the accompanying drawings. For reference, the directions of front, back, up, down, left, and right used in the following description to designate relative positions are intended to facilitate understanding of the invention, and unless otherwise specified, are based on the directions shown in the drawings.

[0033] (First embodiment) Fig. 1 is a diagram showing 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.

[0034] The heat sink 110 corresponds to a main body manufactured as a continuous body by extrusion molding, and a plurality of ribs 112 are integrally formed inside the heat sink along the longitudinal direction L. The heat sink 110 can be prepared by cutting the extrusion molded product manufactured as a continuous body according to the designed length.

[0035] The multiple 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 (such as cooling water) flows. If the surfaces formed by both ends of the heat sink 110 in the longitudinal direction L are defined as a first surface 130 and a second surface 132, respectively, the first surface 130 and the second surface 132 are open. In other words, the ribs 112 formed inside the heat sink 110 can be accessed via the first surface 130 and the second surface 132.

[0036] Here, the longitudinal direction L is defined as the extrusion molding direction of the heat sink 110, i.e., the direction in which the ribs 112 extend, and the width direction W is defined as the direction perpendicular to the longitudinal direction L in which the multiple ribs 112 are spaced apart.

[0037] A plurality of end plugs 150 are coupled to close the first and second surfaces 130, 132 at both ends of the heat sink 110. Each end plug 150 is composed of an insert 152 that is inserted into the heat sink 110 and a front face 154 that covers the first and second surfaces 130, 132 of the heat sink 110 after coupling. That is, the end plugs 150 are generally shaped like the letter "T" when viewed in the width direction W. The front face 154 of the end plug 150 has a shape that corresponds to the outlines of the first and second surfaces 130, 132, and the insert 152 is shaped to fit snugly into the interior space of the heat sink 110.

[0038] The ribs 112 are machined by partially removing both ends of each rib 112 to form spaces for inserting the inserts 152 of the end plugs 150 and to form flow paths for the coolant to flow in and out of the heat sink 110. Referring to the embodiment shown in FIG. 2 , an inlet port 134 through which the coolant flows in and an outlet port 136 through which the coolant flows out are disposed on the first surface 130 of the heat sink 110, and three end plugs 150 are coupled thereto. That is, one inlet plug 156 is coupled to the center of the heat sink 110, and two outlet plugs 157 are coupled to each side of the inlet plug 156. Finally, one return plug 158 is coupled to the second surface 132 to form the coolant return flow path 126.

[0039] The central flow passage 120 assigned to the inlet plug 156 forms the inlet flow passage 122, and the refrigerant that strikes the return plug 158 on the second surface 132 flows into outlet flow passages 124 on the left and right of the inlet flow passage 122, which are formed by the two outlet plugs 157. A flow space is formed between the insert 152 of the inlet plug 156 and the end of the rib 112 so that the refrigerant supplied through the inlet port 134 can flow evenly into the multiple inlet flow passages 122. Similarly, flow spaces are formed in the return plug 158 and the outlet plug 157, and these flow spaces between the end plugs 150 and the ribs 112 are created by machining (e.g., milling) both ends of the ribs 112.

[0040] A first heat transfer material 160 is provided on the upper surface of the heat sink 110, protruding so as to come into contact with the bottom surface of the terminal bus bar 212 provided on the battery module 200 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 come into contact with the bottom surface of the terminal bus bar 212 corresponding to the mounting position of the battery module 200.

[0041] The first thermal transfer material 160 absorbs heat from the terminal bus bar 212 in the form of conductive heat transfer and transfers it to the heat sink 110. Therefore, the first thermal transfer material 160 needs to be a material with excellent thermal conductivity for smooth heat dissipation. For example, the first thermal transfer material 160 may be made of various thermal conductivity improving materials known as TIM (Thermal Interface Material), filler, etc. The first thermal transfer material 160 may be curable or non-curable.

[0042] When the battery module 200 is mounted on the heat sink 110, the heat generated from the terminal bus bar 212 provided in the battery module 200 is transferred to the first heat transfer material 160 by conductive heat transfer, and finally, the heat of the terminal bus bar 212 is released to the outside by the refrigerant (cooling water) flowing inside the heat sink 110.

[0043] In this way, the heat sink assembly 100 of the present invention helps to maintain a uniform temperature among the battery cells by effectively absorbing and dissipating heat from the terminal bus bars 212, which have a significant impact on the temperature deviation among multiple battery cells, such as when maximum heat generation occurs during rapid charging and discharging, thereby improving the quality of the battery pack 10.

[0044] As in the exemplary embodiment shown in the drawings, the first thermal transfer material 160 is provided in a trench 140 that forms a recessed space on the upper surface of the heat sink 110. As shown in FIG. 3, the trench 140 forms a receiving space in the form of a narrow, long groove, and the first thermal transfer material 160 is filled in the space within the trench 140. The trench 140 stably fixes the position of the first thermal transfer material 160 even when the first thermal transfer material 160 is fluid. Therefore, the trench 140 functions as a structure that reliably ensures that the first thermal transfer material 160 contacts the terminal bus bar 212.

[0045] The trench 140 may be continuously formed 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 direction of the heat sink 110, and the trench 140 may be integrally formed in the heat sink 110 by extrusion molding together with the ribs 112 that form the flow paths 120. 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 may be aligned to face the trench 140.

[0046] 4 is a cross-sectional view showing another embodiment of the 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 be formed in multiple rows and may be integrally formed with the trench 140 during extrusion molding of the heat sink 110. The fin structure 142 provides a wide contact area for fixing the first thermal transfer material 160 as well as an expanded heat conduction area. Therefore, the trench 140 structure provided with the fin structure 142 may be more effective in dissipating heat from the terminal bus bar 212.

[0047] 3 and 4, an inlet channel 122 through which cooling water flows into the heat sink 110 may be located below the bottom surface of the trench 140. Since the channel 120 inside the heat sink 110 at least partially overlaps the trench 140, heat from the first heat transfer material 160 fixed in the trench 140 can be more effectively dissipated by the cooling water. In particular, it is preferable that the channel 120 that overlaps the trench 140 is the inlet channel 122. The cooling water flowing through the inlet channel 122 has a relatively lower temperature than the cooling water in the outlet channel 124, and therefore, smoother cooling of the terminal bus bar 212 can be expected.

[0048] FIG. 5 illustrates an embodiment of an inlet channel 122 of a heat sink 110. In the embodiment of FIG. 5, the inlet channel 122 includes an extension channel 122-1 protruding from the upper surface of the heat sink 110. That is, the inlet channel 122 extends above and below the upper surface of the heat sink 110. For example, the cross-sectional shape of the inlet channel 122 may have an inverted T shape. The extension channel 122-1 protruding from the upper surface of the heat sink 110 and the trench 140 may share one sidewall. The inlet channel 122 includes the extension channel 122-1, which increases the flow rate of refrigerant. Furthermore, the shared sidewall increases the heat conduction area, so the embodiment of FIG. 5 may provide improved cooling of the terminal bus bar 212.

[0049] (Second embodiment) 6 is a view showing an embodiment in which a battery module 200 is mounted on the heat sink assembly 100 described in the first embodiment. Although FIG. 6 exemplarily shows one battery module 200 mounted on the heat sink assembly 100, the battery pack 10 is completed by closely packing a number of battery modules 200 corresponding to the mounting area of ​​the heat sink assembly 100.

[0050] The battery pack 10 provided by the present invention includes the heat sink assembly 100 having the above-described configuration and at least one battery module 200 mounted on the upper surface of the heat sink assembly 100. Heat generated from the terminal bus bar 212 provided in the battery module 200 is transferred to the first heat transfer material 160 provided on the upper surface of the heat sink assembly 100 by conductive heat transfer.

[0051] 7 is a view showing an embodiment in which the terminal bus bar 212 contacts the first heat transfer material 160 in the trench 140. The trench 140, which forms a space in which the first heat transfer material 160 is fixed, is provided on the upper surface of the heat sink assembly 100, and when the battery module 200 is mounted in a predetermined position on the upper surface of the heat sink assembly 100, the bottom surface of the terminal bus bar 212 provided on the battery module 200 contacts the first heat transfer material 160 provided in the trench 140. As a result, heat generated from the terminal bus bar 212 is transferred to the first heat transfer material 160 by conductive heat transfer, and ultimately, the heat of the terminal bus bar 212 is released to the outside by the refrigerant flowing inside the heat sink assembly 100.

[0052] The battery module 200 includes a bus bar frame assembly 210 having a plurality of terminal bus bars 212 for electrically connecting the leads of a plurality of battery cells. The bus bar frame assembly 210 includes a main frame 214 to which the terminal bus bars 212 are fixed, and a cover 216 that protects the terminal bus bars 212. The battery module 200 is mounted on the heat sink assembly 100 with the bus bar frame assembly 210 facing the trench 140.

[0053] The bottom surface of the terminal bus bar 212 is exposed to the bus bar frame assembly 210, and the exposed bottom surface of the terminal bus bar 212 contacts the first heat transfer material 160 provided in the trench 140, thereby transferring heat generated from the terminal bus bar 212 to the first heat transfer material 160 by conductive heat transfer.

[0054] Here, the trench 140 may be formed to extend along the longitudinal direction L in a central region in the width direction W of the heat sink 110. That is, the trench 140 may be integrally formed together with the ribs 112 that form the internal flow passage 120 during the extrusion molding process of the heat sink 110. As a result, when mounting a plurality of battery modules 200 on 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 bring the terminal bus bars 212 into contact with the first heat transfer material 160.

[0055] In order to smoothly release heat from the terminal bus bar 212, the inlet passage 122 through which the coolant flows into the heat sink 110 may partially overlap the trench 140. In other words, it is preferable that the coolant that discharges the heat absorbed by the first heat transfer material 160 to the outside of the battery pack 10 be adjacent to the lower side of the trench 140.

[0056] In addition, it is preferable that the inlet flow passage 122, through which a cooler refrigerant than the outlet flow passage 124 flows, among the internal flow passages 120 of the heat sink 110 is disposed around the trench 140. For this reason, the trench 140 and the inlet flow passage 122 are concentrated in 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 bus bar frame assemblies 210 of the battery modules 200 on both sides in the width direction W face each other, making it easier to form electrical connections within the battery pack 10.

[0057] 8 is a diagram illustrating another embodiment in which a terminal bus bar 212 is thermally coupled 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, but this is to show that the first heat transfer material 160 can be fixed without the aid of a trench 140. For example, if the first heat transfer material 160 has physical properties that allow it to maintain a certain degree of shape (e.g., a high-viscosity curable TIM, etc.), the trench 140 structure may not be applied.

[0058] 8, the terminal bus bar 212 does not have to be in direct contact with the first heat transfer material 160. For example, the terminal bus bar 212 may be provided with a second heat transfer material 162 on its surface, and may include a heat conductive member 164 in contact with the second heat transfer material 162. The second heat transfer material 162 may be a hardening material that can structurally support the heat conductive member 164. The heat conductive member 164 may be a metal material with a high thermal conductivity, such as aluminum or copper, and the heat conductive member 164 contacts the first heat transfer material 160 fixed on the heat sink 110. Therefore, heat generated from the terminal bus bar 212 is transferred to the first heat transfer material 160 by conductive heat transfer via the second heat transfer material 162 and the heat conductive member 164.

[0059] In the embodiment of FIG. 8, the thermal conduction resistance increases as the second thermal transfer material 162 and the thermal conductive member 164 are added to the thermal conduction path, but it can have the advantage of improving design freedom in the mounting position and structure of the battery module 200, the arrangement of the first thermal transfer material 160 and / or the trench 140 structure, etc.

[0060] The present invention has been described in more detail above with reference to the drawings and embodiments, etc. However, the configurations shown in the drawings or embodiments in this specification are merely one embodiment of the present invention and do not represent all of the technical ideas of the present invention, and therefore, at the time of filing this application, there may be various equivalents and modifications that can replace them. [Explanation of symbols]

[0061] 10: Battery pack 100: Heat sink assembly 110: Heat sink 112: Rib 120: Flow path 122: Inlet flow path 122-1: Extended channel 124: Outlet flow path 126: Return flow path 130: 1st page 132:Second side 134: Inlet port 136: Outlet port 140: Trench 142: Fin structure 150: End plug 152: Insert 154:Front 156: Inlet plug 157: Outlet plug 158: Return plug 160: First heat transfer material 162: Second heat transfer material 164: Heat conducting material 200: Battery module 210: Busbar frame assembly 212: Terminal bus bar 214: Mainframe 216: Cover L: Longitudinal direction W: Width direction

Claims

1. a heat sink in which a plurality of ribs are integrally formed along a longitudinal direction inside the heat sink by extrusion molding, wherein spaces between the ribs form refrigerant flow paths, and a first surface and a second surface at both ends in the longitudinal direction are open; an end plug closing the first surface and the second surface of the heat sink; Including, On the top surface of the heat sink: The heat sink assembly further comprises a first heat transfer material protruding from the heat sink so as to come into contact with a bottom surface of a terminal bus bar provided in a battery module mounted on the heat sink.

2. The first heat transfer material is The heat sink assembly of claim 1 , wherein the heat sink assembly is disposed within a trench forming a recessed space in an upper surface of the heat sink.

3. The trench is The heat sink assembly of claim 2 formed along the longitudinal direction of the heat sink.

4. a fin structure is provided on the bottom surface of the trench; The heat sink assembly of claim 2 , wherein the first thermal transfer material is fixed onto the fin structure.

5. Below the bottom surface of the trench, The heat sink assembly according to claim 2 , wherein an inlet passage for introducing cooling water is located inside the heat sink.

6. the inlet passage includes an extension passage protruding above an upper surface of the heat sink; The heat sink assembly of claim 5 , wherein the trench shares a sidewall with the expansion channel.

7. A heat sink assembly according to any one of claims 1 to 6; at least one battery module mounted on an upper surface of the heat sink assembly; Including, The heat generated from the terminal bus bar provided in the battery module is transferred to the first heat transfer material by conductive heat transfer.

8. a second heat transfer material provided on a surface of the terminal bus bar; a heat conducting member in contact with the second heat transfer material; Including, The battery pack according to claim 7 , wherein the heat generated from the terminal bus bar is transferred to the first heat transfer material by conductive heat transfer via the second heat transfer material and the thermally conductive member.

9. A heat sink assembly according to any one of claims 2 to 6; at least one battery module mounted on an upper surface of the heat sink assembly; Including, a bottom surface of a terminal bus bar provided in the battery module contacts the first heat transfer material provided in the trench, thereby transferring heat generated from the terminal bus bar to the first heat transfer material by conductive heat transfer.

10. The trench is formed in a central region in a width direction of the heat sink and extends along a longitudinal direction, A plurality of battery modules are aligned and mounted such that their terminal bus bars face the trench, The battery pack according to claim 9 , wherein at least a portion of an inlet flow path through which cooling water flows into the heat sink overlaps with the trench.

Images