Battery pack having improved cooling performance of terminal bus bar

Abstract

The heat sink assembly disclosed herein includes: a heat sink integrally formed with a plurality of ribs along an inner length direction by extrusion molding, a space between the ribs forming a coolant flow path, and having first and second surfaces opened at both ends in the length direction; and an end plug closing the first surface and the second surface at both ends of the heat sink, in which: a first heat transfer material is provided on an upper surface of the heat sink, the first heat transfer material protruding and contacting a bottom surface of a terminal bus bar provided on a battery module to be mounted on the heat sink.

Description

Technical Field

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

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2023-0104024, filed on August 9, 2023, the disclosure of which is incorporated herein by reference. Background Art

[0003] Secondary batteries have become ubiquitous in portable devices and electric vehicles (EVs) or hybrid electric vehicles (HEVs) driven by electricity due to their ease of application, high energy density, and other electrical properties. These secondary batteries have attracted attention as new energy sources that are environmentally friendly and energy-saving, not only because they can significantly reduce the use of fossil fuels, but also because they do not produce any byproducts.

[0004] The types of secondary batteries widely used today include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of these unit secondary batteries or battery cells is about 2.5 to 4.5V. Therefore, if a higher output voltage is required, multiple battery cells are connected in series to form a battery pack. In addition, depending on the charge and discharge capacity required for the battery pack, multiple battery cells can be connected in parallel to form a battery pack. Therefore, the number of battery cells included in the battery pack and their electrical connections can be designed to vary according to the required output voltage or charge and discharge capacity.

[0005] Meanwhile, when a plurality of battery cells are connected in series and / or in parallel to form a battery pack, a battery module or battery unit including at least one battery cell is usually first configured, these battery modules or units are electrically connected and other components such as a temperature sensor, a BMS, an exhaust device, etc. are added to form a battery pack.

[0006] As a condition for ensuring stable performance and life of a battery pack, it is important that a plurality of battery cells housed in the battery pack operate uniformly, and the temperature deviation between the battery cells is used as an indicator for evaluating this. The temperature of a battery cell during charge and discharge can be used to determine whether the battery cell is operating normally, so if the temperature deviation between the battery cells is large, it indicates that there is a problem with the quality of the battery pack. Therefore, the quality control (QC) of the battery pack has a provision for taking the temperature deviation between the battery cells as an evaluation item.

[0007] Temperature deviations in battery cells are often a problem, especially during fast charging, when a lot of heat is generated at the terminal busbars (the ends of the electrical connections between battery cells). When the maximum heat is generated at the terminal busbars, temperature deviations occur between battery cells adjacent to the terminal busbars and battery cells separated from them. Therefore, in order to pass quality control, the area where high temperatures are generated, i.e., the terminal busbars, must be intensively cooled. Summary of the invention

[0008] Technical issues

[0009] An object of the present disclosure is to reduce temperature deviation between battery cells through enhanced cooling of terminal bus bars that are ends of electrical connections between battery cells, thereby improving performance of a battery pack.

[0010] However, the technical challenges that the present disclosure attempts to solve are not limited to the above challenges, and other challenges not mentioned will be apparent to those of ordinary skill in the art based on the description of the present disclosure set forth below.

[0011] Technical Solution

[0012] The present disclosure relates to a radiator assembly, which in one example includes: a radiator having a plurality of ribs integrally formed along an inner length direction by extrusion molding, wherein spaces between the ribs form a coolant flow path, and both ends in the length direction have an open first surface and a second surface; and end plugs, which close the first surface and the second surface of both ends of the radiator, wherein a first heat transfer material is provided on an upper surface of the radiator, the first heat transfer material protruding and contacting with a bottom surface of a terminal bus bar provided on a battery module to be mounted on the radiator.

[0013] In an exemplary embodiment of the present disclosure, the first heat transfer material is disposed in a groove forming a concave space on an upper surface of the heat sink.

[0014] The grooves may be formed along the length direction of the heat sink.

[0015] The bottom surface of the groove is provided with a pin structure, wherein the first heat transfer material can be fixed on the pin structure.

[0016] An inlet flow path for coolant to flow into the radiator may be provided below the bottom surface of the groove.

[0017] Additionally, the inlet flow path includes a diverging flow path that protrudes above an upper surface of the heat sink, wherein the groove may share a sidewall with the diverging flow path.

[0018] At the same time, the present disclosure provides a battery pack, comprising: a radiator assembly having the above-mentioned configuration; and at least one battery module mounted on the upper surface of the radiator assembly, wherein heat generated by a terminal bus bar arranged in the battery module is transferred to a first heat transfer material by thermal conduction.

[0019] According to an embodiment, a battery pack may include: a second heat transfer material disposed on a surface of a terminal bus bar; and a heat conductive member in contact with the second heat transfer material, wherein heat generated in the terminal bus bar is transferred to the first heat transfer material by heat conduction via the second heat transfer material and the heat conductive member.

[0020] In addition, the present disclosure may provide a battery pack, comprising: a heat sink assembly including a groove for accommodating a 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 disposed in the battery module contacts the first heat transfer material disposed in the groove, whereby heat generated by the terminal bus bar is transferred to the first heat transfer material by thermal conduction.

[0021] Here, the groove is formed to extend from the middle area of ​​the radiator in the width direction along the length direction, and multiple battery modules are aligned and installed in a manner such that their respective terminal bus bars face the groove, wherein at least a portion of the inlet flow path for the coolant to flow into the radiator can overlap with the groove.

[0022] Beneficial Effects

[0023] According to an embodiment of the present disclosure having the above configuration, when the battery module is mounted on the radiator, the heat generated by the terminal bus bar arranged in the battery module is transferred to the first heat transfer material through thermal conduction, and finally the heat of the terminal bus bar is released to the outside through the coolant flowing inside the radiator.

[0024] Therefore, the heat sink assembly of the present disclosure helps the battery cells maintain a uniform temperature by actively absorbing and dissipating heat from the terminal bus bars, which has a significant impact on the temperature deviation between the plurality of battery cells, thereby improving the quality of the battery pack.

[0025] However, the technical effects of the present disclosure are not limited to those effects described above, and other effects not mentioned will be apparent to those of ordinary skill in the art from the description of the present disclosure set forth below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Since the following drawings attached to this specification illustrate exemplary embodiments of the present disclosure and are used to facilitate understanding of the technical concept of the present disclosure and specific implementation methods of the present disclosure described below, the present disclosure should not be restrictively interpreted based on the drawings.

[0027] Figure 1 is a diagram illustrating a heat sink assembly according to one embodiment of the present disclosure.

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

[0029] Figure 3 is a cross-sectional view showing the structure of a groove.

[0030] Figure 4 is a cross-sectional view showing another embodiment of a groove.

[0031] Figure 5 is a diagram showing one embodiment of an inlet flow path of a radiator.

[0032] Figure 6 It is shown installed to Figure 1 A diagram of one embodiment of a heat sink assembly for a battery module.

[0033] Figure 7 is a diagram showing one embodiment of a terminal bus bar in contact with a heat transfer material in a groove.

[0034] Figure 8 is a diagram 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

[0035] The present disclosure may have various modifications and various embodiments, and thus, specific embodiments thereof will be described in detail below.

[0036] However, it will be understood that the present disclosure is not limited to the specific embodiments, and includes all modifications, equivalents, or replacements within the spirit and technical scope of the present disclosure.

[0037] The terms "include", "comprising" and "having" used in this document indicate the presence of the features, quantities, steps, actions, parts or components described in their specifications or combinations, and it should be understood that the presence or possibility of adding one or more other features, quantities, steps, actions, parts, components or combinations thereof are not precluded.

[0038] In addition, in the present disclosure, when one part of a layer, film, region, plate, etc. is set to be located "on" another part, this includes not only the case where one part is "directly" set "on" another part, but also the case where another part is interposed therebetween. Conversely, when one part of a layer, film, region, plate, etc. is set to be located "below" another part, this includes not only the case where one part is "directly" set "below" another part, but also the case where another part is interposed therebetween. In addition, in the present specification, "on" includes not only the case where it is set on the upper part, but also the case where it is set on the lower part.

[0039] The present disclosure relates to a radiator assembly. In one example, the radiator assembly includes: a radiator having a plurality of ribs integrally formed along an inner length direction by extrusion molding, wherein spaces between the ribs form a coolant flow path, and both ends in the length direction have an open first surface and a second surface; and an end plug, wherein the end plug closes the first surface and the second surface of both ends of the radiator, wherein a first heat transfer material is provided on an upper surface of the radiator, the first heat transfer material protruding and contacting with a bottom surface of a terminal bus bar provided on a battery module to be mounted on the radiator.

[0040] Therefore, when the battery module is mounted on the radiator, heat generated by the terminal busbars disposed on the battery module is transferred to the first heat transfer material by heat conduction, and finally the heat of the terminal busbars is released to the outside through the coolant flowing inside the radiator.

[0041] Therefore, the heat sink assembly of the present disclosure helps the battery cells maintain a uniform temperature by actively absorbing and dissipating heat from the terminal bus bars, which has a significant impact on the temperature deviation between the plurality of battery cells, thereby improving the quality of the battery pack.

[0042] [Embodiments for practicing the present invention]

[0043] Hereinafter, with reference to the accompanying drawings, a specific embodiment of the battery pack 10 according to the present disclosure will be described in detail. For reference, the front-rear direction, the up-down direction, and the left-right direction used in the following description to indicate relative positions are intended to help understand the present disclosure, and unless otherwise specifically defined, refer to the directions shown in the drawings.

[0044] [First embodiment]

[0045] Figure 1 is a diagram showing one embodiment of a heat sink assembly 100 for a battery pack 10 of the present disclosure, and Figure 2 is an exploded perspective view of the heat sink assembly 100. The heat sink assembly 100 of the present disclosure includes a heat sink 110 manufactured by extrusion molding and a plurality of end plugs 150.

[0046] The heat sink 110 has a configuration corresponding to the main body, and is manufactured by extrusion molding as a continuous body having a plurality of ribs 112 integrally formed along the inner length direction L. The heat sink 110 can be prepared by cutting an extruded portion manufactured as a continuous body into a designed length.

[0047] The plurality of ribs 112 are spaced apart at appropriate distances along the width direction W, and each space between the ribs 112 is used as a flow path 120 (coolant flow path) for a coolant (e.g., cooling water) to flow. Also, if the surfaces formed by the ends of the two length directions L of the radiator 110 are respectively referred to as a first surface 130 and a second surface 132, the first surface 130 and the second surface 132 are open. That is, the ribs 112 formed inside the radiator 110 can be approached through the first surface 130 and the second surface 132.

[0048] Here, the length direction L is defined to mean an extrusion molding direction of the heat sink 110 , that is, a direction in which the ribs 112 extend, and the width direction W is defined to mean a direction perpendicular to the length direction L in which the plurality of ribs 112 are spaced apart.

[0049] A plurality of end plugs 150 are combined to respectively close the first surface 130 and the second surface 132 of both ends of the heat sink 110. The end plugs 150 include an insert 152 inserted into the heat sink 110 and a front face 154 covering the first surface 130 and the second surface 132 of the heat sink 110 after the combination. That is, the shape of the end plug 150 is substantially similar to the letter "T" when viewed in the width direction W. The front face 154 of the end plug 150 is formed to correspond to the contours of the first surface 130 and the second surface 132, and the insert 152 is formed to be precisely fitted into the internal cavity of the heat sink 110.

[0050] Machining is performed on the plurality of ribs 112 to cut portions of both ends thereof, thereby forming a space for inserting the insert 152 of the end plug 150 and forming a flow path for the coolant to flow in and out of the radiator 110. Figure 2 In one embodiment shown in FIG. 1 , the first surface 130 of the radiator 110 is provided with an inlet port 134 for coolant to flow in and an outlet port 136 for coolant to flow out, and for this purpose, three end plugs 150 are coupled to the outlet ports. That is, an inlet plug 156 is coupled in the middle of the radiator 110, and an outlet plug 157 is coupled on either side thereof; and on the second surface 132, a return plug 158 is coupled to form a return flow path 126 for the coolant.

[0051] The intermediate flow path 120 distributed to the inlet plug 156 forms the inlet flow path 122, and the coolant hitting the return plug 158 on the second surface 132 flows into the outlet flow path 124 formed by the two outlet plugs 157 on either side of the inlet flow path 122. A flow space is formed between the insert 152 of the inlet plug 156 and the end of the rib 112 so that the coolant supplied through the inlet port 134 flows uniformly into the plurality of inlet flow paths 122. Similarly, flow spaces are formed in the return plug 158 and the outlet plug 157, and the flow space between these end plugs 150 and the rib 112 is realized by cutting both ends of the rib 112 by machining (e.g., milling).

[0052] The upper surface of the heat sink 110 is provided with the first heat transfer material 160, which protrudes 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 to contact the bottom surface of the terminal bus bar 212 corresponding to the mounting position of the battery module 200.

[0053] The first heat transfer material 160 absorbs heat from the terminal bus bar 212 in the form of thermal conduction heat transfer and transfers it to the heat sink 110. Therefore, for good heat dissipation, the first heat transfer material 160 needs to have a material with good thermal conductivity. For example, the first heat transfer material 160 may include various thermally conductive reinforcements such as thermal interface materials (TIM), fillers, etc. The first heat transfer material 160 may be curable or non-curable.

[0054] When the battery module 200 is mounted on top of the radiator 110, the heat generated by the terminal bus bar 212 arranged in the battery module 200 is transferred to the first heat transfer material 160 by heat conduction, and finally the heat from the terminal bus bar 212 is released to the outside through the coolant (cooling water) flowing inside the radiator 110.

[0055] Therefore, the heat sink assembly 100 of the present disclosure can help the battery cells maintain a uniform temperature by effectively absorbing and dissipating heat from the terminal bus bar 212, which has a significant impact on the temperature deviation between multiple battery cells (for example, the maximum heat is generated during rapid charging and discharging), thereby improving the quality of the battery pack 10.

[0056] In the exemplary embodiment shown in the figure, the first heat transfer material 160 is disposed in the groove 140 forming a concave space on the upper surface of the heat sink 110. Figure 3As shown, the groove 140 forms a narrow, elongated groove-shaped accommodation space, and the space within the groove 140 is filled with the first heat transfer material 160. Even when the first heat transfer material 160 is a fluid, the groove 140 reliably fixes the first heat transfer material 160 in place. Therefore, the groove 140 serves as a structure to ensure that the first heat transfer material 160 contacts the terminal bus bar 212.

[0057] The groove 140 may be continuously formed along the length direction L of the heat sink 110. As described above, the length direction L of the heat sink 110 corresponds to the extrusion molding direction of the heat sink 110, and the groove 140 may also be integrally formed into the heat sink 110 by extrusion molding together with the ribs 112 forming the flow path 120. And, as will be described later, when a plurality of battery modules 200 are mounted to the heat sink assembly 100, the terminal bus bar 212 of each battery module 200 may be aligned to face the groove 140.

[0058] Figure 4 1 is a cross-sectional view showing another embodiment of the groove 140. Figure 4 In the embodiment of the present invention, the bottom surface of the groove 140 is provided with a pin structure 142. The pin structure 142 may be formed in multiple rows and may be integrally formed during the extrusion of the heat sink 110 together with the groove 140. The pin structure 142 provides a large contact area for fixing the first heat transfer material 160 and an enlarged heat conduction area. Therefore, the groove 140 structure with the pin structure 142 may be more effectively used for heat dissipation of the terminal bus bar 212.

[0059] And, if Figure 3 and Figure 4 As shown, an inlet flow path 122 may be provided below the bottom surface of the groove 140, through which the coolant is introduced into the heat sink 110. By at least partially overlapping the flow path 120 inside the heat sink 110 with the groove 140, heat from the first heat transfer material 160 fixed in the groove 140 may be more effectively released into the coolant.

[0060] In particular, more preferably, the flow path 120 overlapping the groove 140 is the inlet flow path 122. Since the coolant flowing through the inlet flow path 122 is at a relatively lower temperature than the coolant in the outlet flow path 124, it can be expected to cool the terminal bus bar 212 more effectively.

[0061] Figure 5 is a diagram showing one embodiment of the inlet flow path 122 of the radiator 110. Figure 5In the embodiment, the inlet flow path 122 includes an expansion flow path 122-1 that protrudes above the upper surface of the heat sink 110. That is, relative to the upper surface of the heat sink 110, the inlet flow path 122 spans above and below the upper surface. For example, the cross-sectional shape of the inlet flow path 122 can form an inverted T of the English letter. In addition, the expansion flow path 122-1 and the groove 140 can share one side wall of each other that protrudes above the upper surface of the heat sink 110. Since the inlet flow path 122 includes the expansion flow path 122-1, the flow rate of the coolant is increased, and the heat transfer area through the shared side wall is expanded, so Figure 5 Embodiments of may result in improved cooling of the terminal bus bar 212 .

[0062] [Second embodiment]

[0063] Figure 6 1 is a diagram showing one embodiment of a battery module 200 mounted to the heat sink assembly 100 described in the first embodiment. Figure 6 A single battery module 200 mounted to the heat sink assembly 100 is shown, but a large number of battery modules 200 may be densely packed to correspond to the mounting area of ​​the heat sink assembly 100 , thereby completing the battery pack 10 .

[0064] The battery pack 10 provided by the present disclosure includes a heat sink assembly 100 having the configuration described above and at least one battery module 200 mounted on the upper surface of the heat sink assembly 100. Heat generated by the terminal bus bar 212 disposed on the battery module 200 is transferred to the first heat transfer material 160 disposed on the upper surface of the heat sink assembly 100 by thermal conduction heat transfer.

[0065] Figure 7 1 is a diagram showing one embodiment of a terminal bus bar 212 in contact with a first heat transfer material 160 in a groove 140. The upper surface of the heat sink assembly 100 is provided with a groove 140, the groove 140 forms a space in which the first heat transfer material 160 is fixed, and when the battery module 200 is mounted at 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 is in contact with the first heat transfer material 160 provided in the groove 140. Therefore, the heat generated by the terminal bus bar 212 is transferred to the first heat transfer material 160 by means of heat conduction heat transfer, and finally the heat from the terminal bus bar 212 is dissipated to the outside through the coolant flowing inside the heat sink assembly 100.

[0066] 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 the heat sink assembly 100, and the busbar frame assembly 210 faces the groove 140.

[0067] The terminal bus bar 212 has a bottom surface exposed relative 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 disposed in the groove 140, whereby the heat generated by the terminal bus bar 212 is transferred to the first heat transfer material 160 by thermal conduction.

[0068] Here, the groove 140 may be formed to extend from a middle region in the width direction W of the heat sink 110 along the length direction L. That is, during the extrusion molding process of the heat sink 110, the groove 140 may be integrally formed together with the rib 112 forming the internal flow path 120. Therefore, when a plurality of battery modules 200 are mounted to the heat sink assembly 100, alignment of the plurality of battery modules 200 with respect to the grooves 140 formed in a row and contact of the terminal bus bar 212 with the first heat transfer material 160 are facilitated.

[0069] Also, to facilitate heat dissipation from the terminal bus bar 212, the inlet flow path 122 for introducing the coolant into the heat sink 110 may overlap partially up and down relative to the groove 140. In other words, it may be desirable to have the coolant near the lower side of the groove 140 to dissipate the heat absorbed by the first heat transfer material 160 to the outside of the battery pack 10.

[0070] In addition, it may be desirable that the inlet flow path 122 of the internal flow path 120 of the heat sink 110 is disposed around the groove 140, through which cooler coolant flows than the outlet flow path 124. To this end, the groove 140 and the inlet flow path 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 length direction L, the battery modules 200 on either side in the width direction W will have the bus bar frame assemblies 210 facing each other, which facilitates the configuration of electrical connections within the battery pack 10.

[0071] Figure 8 2 is a diagram showing another embodiment in which the terminal bus bar 212 is thermally connected to the heat transfer material on the upper surface of the heat sink 110 . Figure 8The embodiment does not include the groove 140 structure, which is intended to show that the first heat transfer material 160 can be fixed without the help of the groove 140. For example, if the first heat transfer material 160 has a property that allows it to maintain a certain degree of shape (e.g., high viscosity curable TIM, etc.), the groove 140 structure may not be applicable.

[0072] In addition, as in Figure 8 In an exemplary embodiment of the present invention, 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 be provided with the 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 curable material so that it can structurally support the heat conductive member 164. The heat conductive member 164 may be a metal material such as aluminum, copper, etc. having a high heat transfer coefficient, and the heat conductive member 164 is in contact with the first heat transfer material 160 fixed to the heat sink 110. Therefore, the heat generated by the terminal bus bar 212 is transferred to the first heat transfer material 160 via the second heat transfer material 162 and the heat conductive member 164 by heat conduction heat transfer.

[0073] Although Figure 8 The embodiment increases thermal resistance due to the addition of the second heat transfer material 162 and the heat conductive member 164 on the heat conductive path, but it can benefit from increased design freedom in the installation position or structure of the battery module 200, the placement of the first heat transfer material 160 and / or the groove 140 structure, etc.

[0074] The present disclosure has been described in detail above with reference to the drawings and embodiments. However, it will be understood that the configuration shown in the drawings or embodiments described herein is only one embodiment of the present disclosure and does not represent all technical concepts of the present disclosure, and when submitting this application, there may be various equivalents and modifications that can replace them.

[0075] [Explanation of Reference Numerals]

[0076] 10: Battery Pack

[0077] 100: Radiator assembly

[0078] 110: Radiator

[0079] 112: Rib

[0080] 120: Flow Path

[0081] 122: Inlet flow path

[0082] 122-1: Expanding Flow Path

[0083] 124: Outlet flow path

[0084] 126: Return flow path

[0085] 130: First surface

[0086] 132: Second Surface

[0087] 134: Ingress port

[0088] 136: egress port

[0089] 140: Groove

[0090] 142: Pin structure

[0091] 150: End plug

[0092] 152: Insert

[0093] 154: Positive

[0094] 156: Entrance plug

[0095] 157: Exit plug

[0096] 158: Return to the

[0097] 160: First heat transfer material

[0098] 162: Second heat transfer material

[0099] 164: Heat conducting components

[0100] 200: Battery module

[0101] 210: Busbar frame assembly

[0102] 212: Terminal busbar

[0103] 214: Main frame

[0104] 216: Cover

[0105] L: length direction

[0106] W: Width direction

Claims

1. A radiator assembly, comprising: A heat sink having a plurality of ribs integrally formed along an inner length direction by extrusion molding, wherein spaces between the ribs form a coolant flow path, and both ends in the length direction have an open first surface and a second surface; as well as end plugs, the end plugs closing the first surface and the second surface at both ends of the heat sink, wherein: A first heat transfer material is provided on an upper surface of the heat sink, the first heat transfer material protruding and contacting a bottom surface of a terminal bus bar provided on a battery module to be mounted on the heat sink.

2. The heat sink assembly according to claim 1, wherein: The first heat transfer material is disposed in a groove forming a concave space on the upper surface of the heat sink.

3. The heat sink assembly according to claim 2, wherein: The groove is formed along the length direction of the heat sink.

4. The heat sink assembly according to claim 2, wherein: The bottom surface of the groove is provided with a pin structure, Wherein, the first heat transfer material is fixed on the pin structure.

5. The heat sink assembly according to claim 2, wherein: An inlet flow path for coolant to flow into the radiator is provided below the bottom surface of the groove.

6. The heat sink assembly according to claim 5, wherein: The inlet flow path includes a diverging flow path that protrudes above the upper surface of the heat sink, Wherein, the groove and the expansion flow path share a side wall.

7. A battery pack comprising: The radiator assembly according to any one of claims 1 to 6; as well as at least one battery module mounted on an upper surface of the heat sink assembly, The heat generated by the terminal bus bar disposed in the battery module is transferred to the first heat transfer material by heat conduction.

8. The battery pack according to claim 7, comprising: a second heat transfer material disposed on a surface of the terminal bus bar; as well as a heat conducting member, the heat conducting member being in contact with the second heat transfer material, The heat generated in the terminal bus bar is transferred to the first heat transfer material through the second heat transfer material and the heat conductive component by heat conduction.

9. A battery pack comprising: The radiator assembly according to any one of claims 2 to 6; as well as at least one battery module mounted on an upper surface of the heat sink assembly, The bottom surface of the terminal bus bar disposed in the battery module contacts the first heat transfer material disposed in the groove, so that heat generated by the terminal bus bar is transferred to the first heat transfer material by heat conduction.

10. The battery pack according to claim 9, wherein: The groove is formed to extend from a middle area in the width direction of the heat sink along the length direction, A plurality of battery modules are aligned and installed in such a manner that their respective terminal bus bars face the grooves. Wherein at least a portion of an inlet flow path for coolant to flow into the radiator overlaps with the groove.

Images