Battery pack

Abstract

A battery pack is disclosed. The battery pack includes a plurality of battery cells, and each of the battery cells includes an exhaust port. The housing accommodates the battery cells, and the cover covers an upper surface of the housing. The bus bar connects the plurality of battery cells to each other. The radiator is located on the cover. A heat transfer material is applied to the bus bar and covers at least a portion of the heat sink. The heat sink includes a main body including a plurality of windows positioned to correspond to the exhaust ports of the battery cells, and a leg extending from the main body toward the bus bar. Accordingly, the battery pack may effectively discharge heat generated from the bus bar during use of the battery pack through the improved heat dissipation structure.

Description

[0001] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0131908, filed on October 4, 2023, in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. TECHNICAL FIELD

[0002] One or more embodiments relate to a battery pack. BACKGROUND

[0003] Unlike a primary battery that is not rechargeable, a secondary battery refers to a battery that is chargeable and dischargeable. The secondary battery is used as an energy source for a mobile device, an electric vehicle, a hybrid vehicle, an electric bicycle, an uninterruptible power supply, etc. According to the type of an external device to which they are applied, the secondary battery is used in the form of a single battery or in the form of a pack in which a plurality of battery cells are connected and grouped as one unit.

[0004] Recently, as the capacity of a battery cell has increased and the number of battery cells included in a battery pack has increased, excessive heat is generated in a busbar, which can cause damage to the busbar and the battery cells. Accordingly, there is a need to improve a heat dissipation structure of the busbar.

[0005] The background technology described herein is technical information that the inventors had or acquired in the process of deriving the present disclosure, and does not necessarily have to be known technology that was publicly disclosed to the general public before the present disclosure was submitted. SUMMARY

[0006] One or more embodiments include a battery pack that can effectively discharge heat generated from a busbar during use of the battery pack through an improved heat dissipation structure.

[0007] However, the problem to be solved by the present disclosure is not limited.

[0008] Additional aspects will be set forth in part in the description that follows, and will be apparent from the description, or can be learned by practice of the presented embodiments of the present disclosure.

[0009] According to one or more embodiments, a battery pack includes a plurality of battery cells each including an exhaust port, a case accommodating the battery cells, a cover covering an upper surface of the case, a busbar connecting the battery cells to each other, a heat sink on the cover, and a heat transfer material applied to the busbar and covering at least a portion of the heat sink, wherein the heat sink includes a main body including a plurality of windows positioned to correspond to the exhaust ports of the plurality of battery cells, and a leg portion extending from the main body toward the busbar.

[0010] The leg portion can be spaced apart from the busbar in a height direction.

[0011] The leg can include a connection portion extending downward from the main body, and an extension portion extending from the connection portion in a length direction of the battery pack and at least partially surrounded by the heat transfer material.

[0012] An upper surface of the heat transfer material can be located above an upper surface of the extension portion.

[0013] The heat transfer material can be applied to one or more protrusions and one or more recesses formed in the bus bar.

[0014] The housing can include a detachable upper case, the upper case can include ribs extending in a length direction of the battery pack, and the heat transfer material can be accommodated between the bus bar and the ribs.

[0015] The ribs can include a plurality of ribs arranged side by side in the length direction of the battery pack, and the plurality of ribs divide regions in which the battery cells are accommodated in the housing.

[0016] Upper ends of the ribs can be located above an upper surface of the bus bar.

[0017] The bus bar can include a first bus bar, a second bus bar, and a third bus bar connecting a plurality of battery cells to each other, and the heat transfer material can be applied to each of the first bus bar, the second bus bar, and the third bus bar.

[0018] The first bus bar can be located at a center in the length direction of the battery pack, and include a first protrusion and a first recess adjacent to the first protrusion, the heat sink can include two heat sinks facing each other, and the heat transfer material can be accommodated on the first protrusion and in the first recess and between the two heat sinks.

[0019] At least a portion of the leg can be above the first recess.

[0020] The battery pack can further include a wall portion extending upward from the first protrusion and dividing the heat transfer material applied to the first bus bar into two portions.

[0021] The second bus bar can include a plurality of second bus bars located on both sides in the length direction of the battery pack, each of the second bus bars can include a second protrusion and a second recess adjacent to the second protrusion, and the heat transfer material can be accommodated on the second protrusion and in the second recess.

[0022] The second protrusion can have a T shape, the second recess can include two second recesses facing each other, and a portion extending from the second protrusion is disposed between the two recesses, and the two second recesses can correspond to different battery cells.

[0023] The heat transfer material applied to the second bus bar can cover at least a portion of the leg of the heat spreader in a length direction of the battery pack.

[0024] At least a portion of the leg of the heat spreader can be located above the second recess.

[0025] The third bus bar can be located on one side of the battery pack in a length direction, and the third bus bar can include a third protrusion and a third recess adjacent to the third protrusion, and the heat transfer material can be accommodated on the third protrusion and in the third recess.

[0026] The third bus bar can include a connection portion adjacent to the third recess, and the heat transfer material can be applied to the connection portion and cover at least a portion of the leg of the heat spreader in a length direction of the battery pack.

[0027] At least a portion of the leg of the heat spreader can be located above the third recess.

[0028] According to one or more embodiments, a battery pack includes: a plurality of battery cells, each of the battery cells including a vent; a case accommodating the battery cells and including an upper case including a rib; a cover covering an upper surface of the case; a bus bar connecting the plurality of battery cells to each other and including at least one protrusion and at least one recess; a heat spreader located on the cover, the heat spreader including a main body and a leg, the main body including a plurality of windows positioned to correspond to the vents of the plurality of battery cells, the leg extending from the main body toward the bus bar and located above an upper surface of the bus bar; and a heat transfer material accommodated on the at least one protrusion, in the at least one recess, on the rib, and covering at least a portion of the heat spreader. BRIEF DESCRIPTION OF DRAWINGS

[0029] The above and other aspects, features, and advantages of certain embodiments of the present disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0030] Figure 1 A battery pack is illustrated;

[0031] Figure 2 An exploded perspective view of a battery pack is illustrated; Figure 1

[0032] Figure 3 A portion of a case, a bus bar, and a heat spreader are illustrated;

[0033] Figure 4 A portion of a case and a bus bar are illustrated;

[0034] Figure 5 An enlarged view of a bus bar and a heat spreader mounted on a case is illustrated;

[0035] Figure 6 ​a first busbar is shown;

[0036] Figure 7 a second busbar is shown;

[0037] Figure 8 a third busbar is shown;

[0038] Figure 9 a cover having a heat sink mounted thereon is shown;

[0039] Figure 10 a heat sink is shown;

[0040] Figure 11 is a cross-sectional view taken along line A-A' of Figure 3

[0041] Figure 12 is a cross-sectional view taken along line B-B' of Figure 3

[0042] Figure 13 is a cross-sectional view taken along line C-C' of Figure 3

[0043] Figure 14 is a cross-sectional view taken along line A-A' of Figure 3 DETAILED DESCRIPTION

[0044] Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. The same reference numerals are used throughout the drawings and like reference numerals are used to depict like elements. In this regard, the implementations presented herein can have different forms and should not be construed as limited to the descriptions set forth herein. Accordingly, the implementations described herein are merely for illustrative purposes and are not intended to limit the scope of this disclosure. Rather, these embodiments are presented for illustrative purposes and one of ordinary skill in the art will appreciate that other embodiments can be practiced by other techniques falling within the scope of the present disclosure. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Expressions such as "at least one of," when preceding a list of two or more items, cover the entire list of items and do not exclude any single one of the items.

[0045] ​​​​Aspects of some embodiments of the present disclosure and methods of implementing them can be more readily understood by reference to the following detailed description, taken with the accompanying drawings. In the following detailed description, embodiments are described in connection with reference to the various drawings. However, the described embodiments can be modified in various different ways and can be implemented in different forms, and should not be construed as being limited to only the embodiments set forth herein. In addition, the various features of the various embodiments of the present disclosure can be partially or entirely combined with each other or merged with each other, and various interlocks and drives are technically possible. Each of the embodiments can be implemented independently of each other, or can be implemented together in association. The described embodiments are provided as examples so that the present disclosure will be thorough and complete, and will fully convey the aspects of the present disclosure to those skilled in the art. It is understood that the present disclosure encompasses all modifications, equivalents, and alternatives falling within the idea and technical scope of the present disclosure. Therefore, processes, elements, and techniques that are not described as being essential to fully understand the aspects of the present disclosure by those of ordinary skill in the art can not be described.

[0046] Unless otherwise indicated, like drawing numbers, characters or combinations thereof throughout the figures and written description indicate like elements, and thus descriptions thereof will not be repeated. In addition, portions that are not related to the description of the embodiments can not be shown to make the description clear.

[0047] In the drawings, the relative sizes of elements, layers, and regions can be exaggerated for clarity. In addition, the use of cross-hatching and / or shading in the drawings is for clarity and is not intended to limit the various forms of the disclosed technology to a particular style of hatching or shading. As such, unless specified otherwise, the presence or absence of cross-hatching or shading is not intended to convey or imply any preference or requirement for a particular material, material property, dimension, ratio, commonality of the illustrated elements, and / or any other characteristic, attribute, property, or the like of the elements shown.

[0048] Various embodiments are described herein with reference to cross-sectional illustrations that are schematic illustrations of embodiments and / or intermediate structures being utilized in the implementation of the disclosed technology. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. In addition, embodiments disclosed herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result from, for example, manufacturing. In the drawings, the same reference numbers can be used throughout the different illustrations to indicate same, similar or corresponding components.

[0049] For example, an implant region shown as rectangular can have rounded or curved features at its edges and / or an implant concentration gradient instead of a binary change from the implant region to the non-implant region. Likewise, a buried region formed by implantation can result in some implantation in the region between the buried region and the surface through which implantation was performed.

[0050] Accordingly, the regions illustrated in the figures are not intended to be limiting in terms of the actual shapes of the regions of the devices and are merely schematic representations showing typical regions in which embodiments of the devices can be made. Additionally, as will be appreciated by one of ordinary skill in the art, embodiments described herein can be modified in a variety of ways without departing from the spirit or scope of the present disclosure.

[0051] In the detailed description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of various embodiments. It will be apparent, however, that various embodiments can be practiced without these specific details or with one or more equivalent arrangements. In other instances, well-known structures and devices are shown in block diagram form in order to avoid unnecessarily obscuring the various embodiments.

[0052] For ease of description, spatially relative terms, such as “below”, “under”, “lower”, “down”, “above”, “up”, “upper” and the like, can be used herein for describing an element’s relationship to another element(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or in operation, in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, elements described as “below” or “under” other elements or features would then be oriented “above” the other elements or features. Thus, the exemplary term “below” can encompass both an orientation of above and below. The device can be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. Similarly, when a first part is described as being “on” a second part, it can mean that the first part is disposed on a top side or bottom side of the second part, as viewed in a direction based on a gravity direction, without being limited to a top side.

[0053] Further, the phrase "in plan view" means when viewing the object portion from above, and the phrase "in schematic cross-sectional view" means when viewing a schematic cross-section taken through a vertical cut of the object portion from the side. The term "superposed" or variations thereof means that a first object can be above or below or to the side of a second object, or vice versa. Additionally, the term "superposed" can include the meanings of layered, stacked, facing or oriented towards, extending over, covering or partially covering, or any other suitable term as will be appreciated and understood by one of ordinary skill in the art. The expression "not superposed" can include the meanings of "spaced apart from" or "placed outside of" or "offset from" as well as any other suitable equivalent as will be appreciated and understood by one of ordinary skill in the art. The terms "facing" and "oriented towards" can mean that a first object can be directly or indirectly opposite a second object. In the case where a third object is interposed between the first object and the second object, the first object and the second object can be understood as indirectly opposite each other, although still facing each other.

[0054] It will be understood that when an element, layer, region or component is referred to as being "formed on", "connected to" or "coupled with" (operatively or communicatively) another element, layer, region or component, it can be directly or indirectly formed on, connected or coupled with the other element, layer, region or component, such that one or more intervening elements, layers, regions or components can exist. In addition, this can be collectively referred to as either directly or indirectly joined or connected, and integrally joined or connected or non-integrally joined or connected. For example, when a layer, region or component is referred to as being "electrically connected" or "electrically coupled" to another layer, region or component, it can be directly electrically connected or directly electrically coupled to the other layer, region and / or component, or there can be intervening layers, regions or components. However, "directly connected / directly coupled" or "directly on" means that one component is directly connected or coupled to another component, or directly on another component, without intervening components. In addition, in the present specification, when a part of a layer, film, region, plate, etc. is formed on another part, the direction of formation is not limited to the upward direction, but includes the part being formed on a side surface or in the downward direction. Conversely, when a part of a layer, film, region, plate, etc. is formed "under" another part, this not only includes the case where the part is "directly under" the other part, but also includes the case where there is yet another part between the part and the other part. Meanwhile, other expressions describing the relationship between components, such as "between", "directly between" or "adjacent to" and "directly adjacent to", can be similarly interpreted. In addition, it will also be understood that when an element or layer is referred to as being "between" two elements or layers, it can be the only element or layer between the two elements or layers, or there can also be one or more intervening elements or layers.

[0055] For purposes of the present disclosure, expressions such as “at least one of,” or “any of,” when preceding the a list of elements, modify the items in the list as a whole rather than each element individually. For example, “at least one of X, Y, and Z,” “at least one of X, Y, or Z,” “at least one selected from the group consisting of X, Y, and Z,” and “at least one selected from the group consisting of X, Y, or Z” can be interpreted as X alone, Y alone, Z alone, or any combination or subset of X, Y, and Z such as XYZ, XYY, YZ, and ZZ, or any variation thereof. Similarly, expressions such as “at least one of A and B” and “at least one of A or B” can include A, B, or both A and B. As used herein, “or” generally means “and / or,” and the term “and / or” includes any and all combinations of one or more of the associated listed items. For example, the expression “A and / or B” can include A, B, or both A and B. Similarly, expressions such as “at least one of,” “one or more of,” “one of,” and other similar phrases preceding a list of elements, modify the entire list of elements as a whole rather than each element individually.

[0056] It will be understood that, although the terms “first,” “second,” “third,” etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section described below could be termed a second element, component, region, layer or section, without departing from the spirit and scope of the present disclosure. Describing an element as a “first” element can not require or imply the presence of a second element or other elements. The terms “first,” “second,” etc. can also be used herein to distinguish different categories or groups of elements. For simplicity, the terms “first,” “second,” etc. can be used herein to refer to “a first category (or first group),” “a second category (or second group),” etc.

[0057] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" "comprising," "includes" "including," "contains" "containing," "consists" "consisting," "consists of," and / or variations thereof, shall not be read to exclude other features, integers, steps, operations, elements, and / or components but are to be construed as specifying the presence of those other features, integers, steps, operations, elements, and / or components, examples of which will become apparent to those of ordinary skill in the art. It will be understood that when an element is referred to as being "on" another element, it can be directly on the element or intervening elements can also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. It will be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms since such terms are only used to distinguish one element, component, region, layer and / or section from another element, component, region, layer and / or section.

[0058] While one or more embodiments can be performed differently, a particular process sequence can be performed differently from the described sequence. For example, two processes described in succession can be performed substantially simultaneously or in the reverse order of the described sequence.

[0059] As used herein, the terms "substantially," "approximately," "about," and similar terms are used as terms of approximation and not as terms of degree, and are intended to account for the inherent deviations in measured or calculated values that would be recognized by those of ordinary skill in the art. In view of the discussed measurements and the errors associated with the measurement of a particular quantity, as used herein, "about" or "approximately" includes the stated value and refers to within an acceptable range of deviation for the particular value as determined by one of ordinary skill in the art. For example, "about" can refer to within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the stated value. Furthermore, the use of "may" in describing embodiments of the present disclosure indicates that one or more embodiments of the present disclosure.

[0060] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and / or the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0061] Figure 1 A battery pack 10 is shown. Figure 2 A battery pack 10 is shown. Figure 1 An exploded perspective view of the battery pack 10. Figure 3 A portion of the housing 100, the bus bar 300, and the heat sink 400 are shown. Figure 4 A portion of the housing and the bus bar 300 are shown. Figure 5 An enlarged view of the bus bar and the heat sink mounted on the housing is shown.Figure 6 A first busbar 310 is shown. Figure 7 A second busbar 320 is shown. Figure 8 A third busbar 330 is shown. Figure 9 A cover having a heat sink 400 mounted thereon is shown. Figure 10 The heat sink 400 is shown. Figure 11 is a cross-sectional view taken along Figure 3 line A-A' of Figure 12 is a cross-sectional view taken along Figure 3 line B-B' of Figure 13 is a cross-sectional view taken along Figure 3 line C-C' of

[0062] A battery pack 10 including a plurality of battery cells C can be applied to large-scale applications such as an energy storage system (ESS). For example, the battery pack 10 can be applied to power a commercial application, a home application, a communication application, or an uninterruptible power supply (UPS). For example, the battery pack 10 can be applied to a vehicle battery or a small-to-medium application such as a desktop computer, a tablet computer, a smart phone, or a laptop computer.

[0063] The battery pack 10 can include a case 100 accommodating a plurality of battery cells C, a cover 200 covering an upper surface of the case 100, busbars 300 connecting the plurality of battery cells C to each other, a heat sink 400 disposed in the cover 200, and a heat transfer material 500 applied to the busbars 300 and covering at least a portion of the heat sink 400. The heat sink 400 can include a main body 410 including a plurality of windows 411 corresponding to exhaust ports of the plurality of battery cells C, and the heat sink 400 can include a leg 420 extending downward from the main body 410 toward the busbars 300.

[0064] The case 100 can include an upper case 110 accommodating the plurality of battery cells C and a rib 112 extending in one direction (for example, a length direction of the battery pack 10 or an X-axis direction of Figure 3 The cover 200 covers an upper surface of the case 100. The busbars 300 connect the plurality of battery cells C to each other and include one or more protrusions and one or more recesses at the upper surface. The heat sink 400 is disposed in the cover 200 and includes a main body 410 including a plurality of windows 411 corresponding to exhaust ports of the plurality of battery cells C and a leg 420 extending downward from the main body 410 toward the busbars 300 (but the leg 420 is spaced apart upward from the upper surface of the busbars 300). The heat transfer material 500 is accommodated on the one or more protrusions, in the one or more recesses, and on the rib 112 so as to cover at least a portion of the heat sink 400.

[0065] The battery cells C included in the battery pack 10 can have a prismatic shape, a pouch shape, or a cylindrical shape. Hereinafter, for convenience of description, it is mainly described that the battery cells C have a prismatic shape. There can be a plurality of battery cells C. The number of battery cells C can be selected according to the specification of the battery pack 10. For example, one battery pack 10 can include a total of eight battery cells C. As another example, one battery pack 10 can include eight or less or eight or more battery cells C. Hereinafter, for convenience of description, it is mainly described that a total of eight battery cells C are included in one battery pack 10.

[0066] The plurality of battery cells C can be connected in series and / or in parallel to each other. For example, eight battery cells C can be connected in series in two, such that four pairs of series-connected battery cells C are formed, and the four pairs of battery cells C can be connected in parallel to each other. Accordingly, the plurality of battery cells C can be connected to each other in different series / parallel structures.

[0067] The battery pack 10 can include a case 100, a cover 200, a busbar 300, a heat spreader 400, and a heat transfer material 500.

[0068] The case 100 can accommodate the plurality of battery cells C. For example, the case 100 can include an internal space and have a substantially cuboid shape. The case 100 can include one or more heat dissipation slits in at least one surface. The case 100 can include an internal space partitioned by a plurality of side surfaces and a bottom surface, and the plurality of battery cells C can be accommodated in the internal space.

[0069] The case 100 can include an upper case 110. The upper case 110 can be detachably coupled to the case 100. When the upper case 110 is separated from the case 100, the plurality of battery cells C can be accommodated in the case 100, and thereafter, the upper case 110 can be mounted on the case 100. The upper case 110 can be mounted on an upper portion of the case 100, and can include exhaust holes 111, ribs 112, and a partition wall 113.

[0070] The exhaust holes 111 can include a plurality of exhaust holes 111 corresponding to exhaust holes of the plurality of battery cells C. If an abnormality occurs in one or more battery cells C and gas is discharged from the exhaust holes of the battery cells C, the exhaust holes 111 can discharge the gas to the outside of the battery pack 10 so that the gas does not stay in the battery pack 10. The exhaust holes 111 can correspond to windows 411 formed in the main body 410 of the heat spreader 400. The exhaust holes 111 can extend upward by a certain height so that an upper end thereof can face the first heat dissipation slit 210 formed in the cover 200. Accordingly, the exhaust holes 111 can minimize the transmission of the gas discharged from the exhaust holes of the battery cells C to other portions of the battery pack 10.

[0071] The ribs 112 can be included in the upper case 110 and can partition a region in which the plurality of battery cells C are accommodated. The ribs 112 can include a plurality of ribs 112. The plurality of ribs 112 can be arranged in parallel in a length direction (e.g., an X-axis direction) of the battery pack 10 inside the upper case 110. The ribs 112 can be more protruded upward than upper surfaces of the plurality of battery cells C so as to hold and support the heat transfer material 500 together with the bus bar 300 and the heat sink 400. In addition, the ribs 112 can be further protruded above the upper surfaces of the bus bar 300. Figure 3

[0072] The plurality of ribs 112 can be spaced apart in a width direction (e.g., a Y-axis direction) of the battery pack 10, and the plurality of battery cells C can be disposed between the ribs 112. Two battery cells C can be disposed in a direction (e.g., an X-axis direction) between the plurality of ribs 112 and can be connected in series with each other. The ribs 112 can be formed throughout a length of the upper case 110. The ribs 112 can be discontinuously formed in the length direction (e.g., the X-axis direction) of the upper case 110. Figure 3

[0073] Upper ends of the ribs 112 can be above the bus bar 300 and below the heat sink 400. The upper ends of the ribs 112 can be above the bus bar 300 and the heat sink 400.

[0074] The partition walls 113 can extend across the upper case 110. For example, the partition walls 113 can extend in a width direction (e.g., a Y-axis direction) of the battery pack 10, be disposed between battery cells C adjacent in a length direction (e.g., an X-axis direction) of the battery pack 10, and partition a region in which the battery cells C are installed together with the ribs 112. The ribs 112 can partition a region in which the plurality of battery cells C are installed in the width direction of the battery pack 10, and the partition walls 113 can partition a region in which the plurality of battery cells C are installed in the length direction of the battery pack 10. Figure 4 Upper ends of the ribs 112 can be above upper ends of the partition walls 113. The upper ends of the ribs 112 can be above upper surfaces of the bus bar 300. Accordingly, when the heat transfer material 500 is applied to the bus bar 300, the heat transfer material 500 can be stably held and supported by the ribs 112.

[0075] The cover 200 can be detachably mounted on an upper surface of the case 100 so as to cover the case 100. As

[0076] Figure 1 Figure 2 ​​​​As shown in , the cover 200 may be provided at the uppermost portion of the battery pack 10 and may prevent external foreign matter from being introduced into the battery pack 10. The cover 200 may be mounted on the upper case 110 to cover the upper case 110 of the outer shell 100. The cover 200 may have an internal space, and while the heat sink 400 is accommodated in the internal space, the heat sink 400 may be on the upper inner surface of the cover 200. A plurality of battery cells C may be accommodated in the outer shell 100 and the upper case 110 may be mounted on the outer shell 100, the bus bar 300 may electrically connect the plurality of battery cells C to each other, and then the cover 200 may be mounted on the upper case 110. The heat sink 400 may be mounted inside the cover 200.

[0077] The cover 200 may include a first heat dissipation slit 210, a second heat dissipation slit 220, and a third heat dissipation slit 230. A plurality of first heat dissipation slits 210, a plurality of second heat dissipation slits 220, and a plurality of third heat dissipation slits 230 may be formed through the cover 200 and may discharge heat generated by the battery pack 10 to the outside of the battery pack 10. For example, if gas is generated due to abnormal operation of the battery pack 10, the gas may be discharged to the outside of the battery pack through the slits 210, 220, 230. As such, the first heat dissipation slit 210, the second heat dissipation slit 220, and the third heat dissipation slit 230 may be formed on the upper surface of the cover 200.

[0078] The cover 200 may include one or more raised portions and recessed portions that form steps with each other on the upper surface. The first heat dissipation slit 210, the second heat dissipation slit 220, and the third heat dissipation slit 230 may be formed in the raised portions and the recessed portions. For example, Figure 1 As shown in FIG, the cover 200 may include a convex portion in a portion corresponding to the exhaust holes of the plurality of battery cells C, and a plurality of first heat dissipation slits 210 may be formed in the corresponding convex portion. The concave portion may be formed in the convex portion in a direction relative to the length direction of the battery pack 10 (e.g., Figure 1 On both sides of the battery pack 10 in the X-axis direction), a plurality of second heat dissipation slits 220 may be formed in the concave portion. A convex portion may be formed in the center in the length direction of the battery pack 10, and a plurality of third heat dissipation slits 230 may be formed in the convex portion. Figure 1 As shown in , a plurality of heat dissipation slits may be formed on the entire upper surface of the battery pack 10 , and thus, heat and gas generated by the battery pack 10 may be smoothly discharged to the outside of the battery pack 10 .

[0079] The first heat dissipation slits 210, the second heat dissipation slits 220, and the third heat dissipation slits 230 may have different arrangements in the length direction of the battery pack 10. For example, Figure 1As shown in , multiple second heat dissipation slits 220 may be formed at the outermost sides of the battery pack 10 in the longitudinal direction, and the multiple second heat dissipation slits 220 may be arranged parallel to the longitudinal direction of the battery pack 10. The first heat dissipation slits 210 may be arranged inwardly of the second heat dissipation slits 220 in the longitudinal direction of the battery pack 10 and arranged differently from the second heat dissipation slits 220 (e.g., arranged parallel to the width direction of the battery pack 10). Furthermore, the third heat dissipation slits 230 may be arranged inwardly of the first heat dissipation slits 210 in the longitudinal direction of the battery pack 10 and arranged identically to the first heat dissipation slits 210 (e.g., arranged parallel to the width direction of the battery pack 10). Therefore, heat and gas generated from the battery pack 10 can be smoothly discharged to the exterior of the battery pack 10.

[0080] Figure 1 The plurality of first heat dissipation slits 210, second heat dissipation slits 220, and third heat dissipation slits 230 are shown as being arranged side by side in the length direction (e.g., X-axis direction) and the width direction (e.g., Y-axis direction) of the battery pack 10. However, the plurality of first heat dissipation slits 210, second heat dissipation slits 220, and third heat dissipation slits 230 may be arranged in various directions and at various angles.

[0081] The bus bar 300 can electrically connect the multiple battery cells C to each other. The bus bar 300 can be a conductor, for example, a metal such as aluminum or copper. The bus bar 300 can be set on one side (for example, the upper surface) of the multiple battery cells C and can connect adjacent battery cells C in series / parallel. The multiple bus bars 300 can each connect two battery cells C in series and connect the battery cells C in parallel to each other to form a 4P2S (4 parallel 2 series) connection structure. The bus bar 300 can be connected to a battery management system (BMS) outside the battery pack 10 to transmit information about the voltage and state of charge of the battery cells C.

[0082] The bus bar 300 may include a first bus bar 310 , a second bus bar 320 , and a third bus bar 330 connecting the plurality of battery cells C to each other. A heat transfer material 500 may be applied to each of the first bus bar 310 , the second bus bar 320 , and the third bus bar 330 .

[0083] The first bus bar 310 may be located at the center of the battery pack 10 in the longitudinal direction and connect the plurality of battery cells C to each other. The first bus bar 310 may have a flat bar shape and connect two battery cells C adjacent in the longitudinal direction (eg, X-axis direction) of the battery pack 10 in series. Figure 4As shown in FIG. 10, a plurality (for example, four) of first bus bars 310 can be provided side by side in the width direction (for example, the Y-axis direction) of the battery pack 10. Each of the first bus bars 310 can connect two battery cells C in series, and the two battery cells C connected in series can be connected in parallel to each other by the second bus bar 320. Both sides of the first bus bar 310 can be in contact with two adjacent battery cells C.

[0084] As shown in FIG. 10, the first bus bar 310 can include a first protruding portion 311 and a first recessed portion 312. The first protruding portion 311 can be formed at the center in the length direction (for example, the X-axis direction) of the first bus bar 310 and on both sides spaced apart from the center. The upper surface of the first protruding portion 311 can be lower than the upper end of the rib 112 and / or the lower end of the heat sink 400. Figure 6 The first recessed portion 312 can be formed between the first protruding portions 311. The first recessed portion 312 and the first protruding portion 311 can hold and support the heat transfer material 500 together with the rib 112 and the leg portion 420 of the heat sink 400. The connection portion between the first recessed portion 312 and the first protruding portion 311 can be an inclined surface. At least a portion of the leg portion 420 can be above the first recessed portion 312.

[0085] The first hole 3121 can be formed in the first recessed portion 312. The first hole 3121 can be an element for welding (for example, laser welding or ultrasonic welding) the battery cell C and the first bus bar 310. The first hole 3121 can discharge gas generated in the battery cell C to the outside of the battery pack 10, or wiring can pass through the first hole 3121 into the battery pack 10.

[0086] The first bus bar 310 can include the first protruding portion 311 at the center in the length direction of the battery pack 10, and the first recessed portion 312 adjacent to the first protruding portion 311. The heat transfer material 500 can be accommodated on the first protruding portion 311 and in the first recessed portion 312, and can be between two heat sinks 400 facing each other.

[0087] The second bus bar 320 can connect the battery cells C to each other. The second bus bar 320 can include a plurality of second bus bars 320 on both sides in the length direction of the battery pack 10. The second bus bar 320 can connect two battery cells C connected in series by the first bus bar 310. As shown in FIG. 10,

[0088] As shown in FIG. 10, each of the second bus bars 320 can have a flat square plate shape, and there can be two second bus bars 320 at a first end and one second bus bar 320 at a second end in the length direction of the battery pack 10 (for example, at the center in the X-axis direction). Figure 4 Figure 4 ​(There are two second bus bars 320 on the right side and one second bus bar 320 on the left side in FIG. ) The second bus bar 320 may connect two pairs of series-connected battery cells C in parallel with each other. Both sides of the second bus bar 320 may contact two adjacent battery cells C.

[0089] The second bus bar 320 may include a second protrusion 321 and a second recess 322. Figure 7 As shown in FIG, the second protrusion 321 may have a T-shape. An upper surface of the second protrusion 321 may be below an upper end of the rib 112 and / or a lower end of the heat sink 400.

[0090] The second recessed portion 322 may be formed adjacent to the second raised portion 321. The second recessed portion 322 may be formed so that the second raised portion 321 is disposed therebetween, and the second recessed portion 322 may form a step with the second raised portion 321. Figure 7 As shown in FIG, two second recessed portions 322 face each other, and a portion extending in one direction (e.g., the X-axis direction) from the T-shaped second protrusion 321 is disposed between the two second recessed portions 322. The heat transfer material 500 may be held and supported in each of the second recessed portions 322. The second recessed portions 322 may correspond to different battery cells C.

[0091] The second recessed portion 322 and the second raised portion 321 can hold and support the heat transfer material 500 together with the rib 112 and the leg portion 420. The connection portion between the second recessed portion 322 and the second raised portion 321 can be an inclined surface. At least a portion of the leg portion 420 of the heat sink 400 can be located above the second recessed portion 322.

[0092] A second hole 3221 may be formed in the second recess 322. The second hole 3221 may be a member for welding (e.g., laser welding or ultrasonic welding) the battery cell C and the second bus bar 320. The second hole 3221 may discharge gas generated in the battery cell C to the outside of the battery pack 10, or allow wiring to enter the battery pack 10 through the second hole 3221.

[0093] The second bus bar 320 may include three second bus bars 320 disposed on both sides in the length direction of the battery pack 10. Each of the second bus bars 320 may include a second protrusion 321 and a second depression 322 adjacent to the second protrusion 321. The heat transfer material 500 may be accommodated on the second protrusion 321 and in the second depression 322.

[0094] The third bus bar 330 may be on one side in the length direction of the battery pack 10. The third bus bar 330 may connect the plurality of battery cells C to a controller such as a BMS outside the battery pack 10. The third bus bar 330 may include a plurality of battery cells C on one side in the length direction of the battery pack 10 (e.g., Figure 4 The second end (eg, relative to the X-axis direction) of Figure 4 The two third bus bars 330 are connected to different battery cells C. The other side of the third bus bar 330 can be connected to an external controller (such as a BMS). Figure 4 As shown in FIG, two third bus bars 330 may face each other, and the second bus bar 320 may be disposed between the two third bus bars 330. The third bus bar 330 may have a shape bent at a certain angle. For example, the third bus bar 330 may have an "L" shape in which a portion is substantially vertically bent. The two third bus bars 330 may be spaced apart from each other in the width direction (e.g., the Y-axis direction) of the battery pack 10, and one second bus bar 320 may be disposed between the third bus bars 330.

[0095] like Figure 8 As shown in FIG, the third bus bar 330 may include a third protrusion 331 , a third depression 332 , a connection portion 333 , and a contact portion 334 .

[0096] The third protrusion 331 may be formed on one side of the third bus bar 330, for example, on the upper surface of one end of the third bus bar 330. The third recess 332 may be formed in a portion adjacent to the third protrusion 331, and the third recess 332 may form a step with the third protrusion 331. The connection portion 333 may be a bent portion of the third bus bar 330, and connects the third protrusion 331 to the contact portion 334. The contact portion 334 may be extended from the connection portion 333 in the height direction of the battery pack 10 (for example, Figure 8 While the third bus bar 330 is in contact with the battery cell C, the contact portion 334 may be exposed to the outside of the housing 100. Therefore, an external device may be connected to the third bus bar 330 through the exposed contact portion 334.

[0097] The third protrusion 331, the third depression 332, and the connection portion 333 can hold and support the heat transfer material 500 together with the rib 112 and the leg 420. The connection portion between the third depression 332 and the third protrusion 331 and the connection portion between the connection portion 333 and the third depression 332 can be an inclined surface. At least a portion of the leg 420 of the heat sink 400 can be above the third depression 332.

[0098] A third hole 3321 can be formed in the third recess 332. The third hole 3321 can be an element for welding (e.g., laser welding or ultrasonic welding) the battery cell C and the third bus bar 330. The third hole 3321 can discharge gas generated in the battery cell C to the outside of the battery pack 10, or wiring can pass through the third hole 3321 into the battery pack 10.

[0099] The third bus bar 330 can be located on one side in the length direction of the battery pack 10, and include a third protrusion 331 and a third recess 332 adjacent to the third protrusion 331. The heat transfer material 500 can be accommodated on the third protrusion 331 and in the third recess 332.

[0100] The third bus bar 330 can include a connection portion 333 adjacent to the third recess 332. The heat transfer material 500 applied to the third bus bar 330 can also be applied to the connection portion 333, and cover at least a portion of the leg portion 420 of the outer side of the heat sink 400 in the length direction of the battery pack 10.

[0101] The heat sink 400 can be located on the plurality of bus bars 300. The heat sink 400 can be on one side of the cover 200, and be configured to discharge heat generated in the plurality of battery cells C and the plurality of bus bars 300 to the outside of the battery pack 10. As Figure 9 shown in FIG. 1, the heat sink 400 can be located on the upper inner surface of the cover 200 and on the plurality of bus bars 300. The heat sink 400 can correspond to and be spaced apart from the plurality of battery cells C with respect to the gas discharge holes of the plurality of battery cells C. The heat sink 400 can be spaced apart from the plurality of bus bars 300 to prevent short circuiting. The heat sink 400 can form a gap with the plurality of bus bars 300 in the height direction (e.g., the Z-axis direction) of the battery pack 10. In addition, the heat transfer material 500 can be applied in the gap. The heat transfer material 500 can transfer heat from the plurality of battery cells C and the plurality of bus bars 300 to the heat sink 400, and the heat sink 400 can discharge the heat to the outside of the battery pack 10 through the heat dissipation slit of the cover 200. The heat sink 400 can include a material having excellent heat conductivity, for example, aluminum or copper. Figure 2

[0102] There can be a plurality of heat sinks 400. For example, as Figure 2 ​As shown in , the radiator 400 may include two radiators 400. The two radiators 400 may each be located on a plurality of battery cells C. The two radiators 400 may be spaced apart from each other. The heat transfer material 500 may be accommodated on the first protrusion 311 and in the first recess 312, and may be disposed between two radiators 400 facing each other. The radiators 400 may be provided in the same number as the number of battery cells C connected in series. For example, if two battery cells C are connected in series with each other, two radiators 400 may be provided. The individual radiators 400 may be arranged in the width direction of the battery pack 10.

[0103] The heat sink 400 may include a body 410 and legs 420 .

[0104] The main body 410 may have a flat plate shape and include a plurality of windows 411 formed therein. The plurality of windows 411 may be formed in the same number as the number of the plurality of battery cells C corresponding to one main body 410. Each of the windows 411 may correspond to a vent hole of each of the battery cells C. If gas is generated due to an abnormality in the battery cell C, the gas moving through the vent hole and the windows 411 may be discharged to the outside of the battery pack 10 through the heat dissipation slits of the cover 200. Figure 10 As shown in FIG, the window 411 may be rectangular, but in other embodiments may be circular, elliptical, or polygonal. Four windows 411 may be spaced apart in the length direction (eg, Y-axis direction) of the heat sink 400 and formed on one body 410.

[0105] The leg portion 420 may include a plurality of legs 420, and the plurality of legs 420 may be configured to transfer heat from the battery cells C and the plurality of bus bars 300 to the body 410. To this end, at least a portion of the leg portion 420 may be below the body 410 and closer to the bus bar 300. For example, Figure 10 As shown in FIG, the legs 420 may include a plurality of legs 420 on both sides of the body 410 in the width direction (e.g., X-axis direction) of the heat sink 400. For example, the legs 420 may be located on both sides of the window 411, and one heat sink 400 may have a total of eight legs 420. The legs 420 may be located in the height direction (e.g., Figure 5 and is spaced apart from the bus bar 300 in the Z-axis direction).

[0106] Each of the plurality of legs 420 can include an extension 421 and a connection 422. The extension 421 can be connected to the body 410 through the connection 422 extending downward from the body 410, and transfer heat generated from the busbar 300 to the body 410. The extension 421 can extend in one direction (e.g., the X-axis direction) parallel to the body 410 and / or the busbar 300. The extension 421 can be below the body 410. An upper surface of the extension 421 can be below a lower surface of the body 410. The extension 421 can extend from the connection 422 in a length direction of the battery pack 10, and at least a portion of the extension 421 can be surrounded by the heat transfer material 500.

[0107] The extension 421 can correspond to the busbar 300. As shown in Figure 11 and Figure 12 The plurality of legs 420 of the heat spreader 400 can be positioned above the first busbar 310 and the second busbar 320. Also, as shown in Figure 11 and Figure 13 The plurality of legs 420 can be positioned above the first busbar 310 and the third busbar 330.

[0108] When the heat transfer material 500 is applied to the busbar 300, the extension 421 can be surrounded by the heat transfer material 500. Since the extension 421 can be surrounded by the heat transfer material 500, heat can be effectively transferred from the heat transfer material 500 to the heat spreader 400.

[0109] In the heat spreader 400 corresponding to the first busbar 310, a first end of the extension 421 can be above the first protrusion 311. A second end of the extension 421 can be above the first recess 312.

[0110] In the heat spreader 400 corresponding to the second busbar 320, one end of the extension 421 can be above the second protrusion 321. The other end of the extension 421 can be above the second recess 322.

[0111] In the heat spreader 400 corresponding to the third busbar 330, a first end of the extension 421 can be above the third protrusion 331. A second end of the extension 421 can be above the third recess 332.

[0112] The heat transfer material 500 can be disposed on the busbar 300 and transfer heat emitted from the plurality of battery cells C and the busbar 300 to the heat spreader 400. The heat transfer material 500 can be adhesive and applied between the busbar 300 and the heat spreader 400. The heat transfer material 500 can be, for example, a polymer such as a dimethylsiloxane resin, an epoxy resin, an acrylate resin, an organopolysiloxane resin, a polyimide resin, a fluorocarbon resin, a benzocyclobutene resin, a fluorinated polyallyl ether resin, a polyamide resin, a polyimide amide resin, a cyanate ester resin, a phenolic resin, an aromatic polyester resin, a polyphenylene ether resin, a bismaleimide triazine resin, a fluororesin, or a combination or blend of these polymers. The heat transfer material 500 can be applied on one or more protrusions formed on the busbar 300 and in one or more recesses.

[0113] The heat transfer material 500 can be applied to the busbar 300 and then cured by a specific post-treatment such as heating, such that the cured heat transfer material 500 maintains its shape. In another embodiment, the heat transfer material 500 can have a high viscosity to maintain a shape substantially the same as the shape initially applied without a separate post-treatment.

[0114] An upper surface of the heat transfer material 500 applied to the busbar 300 can be above an upper surface of the extension 421. Accordingly, the extension 421 can be surrounded by the heat transfer material 500 such that heat generated by the busbar 300 can be smoothly transferred to the heat spreader 400 via the heat transfer material 500 through the extension 421.

[0115] The heat transfer material 500 can be in contact with or cover at least a portion of the connection portion 422. The heat transfer material 500 can be in contact with or cover at least a portion of the main body 410.

[0116] The case 100 can include an upper case 110 detachably mounted to an upper portion thereof. As shown in FIG. Figure 4 The upper case 110 can include a rib 112 extending in a length direction of the battery pack 10, and the heat transfer material 500 can be accommodated between the busbar 300 and the rib 112.

[0117] The heat transfer material 500 can be applied to an area partitioned by the busbar 300 and the heat spreader 400. The heat transfer material 500 can cover at least a portion of the busbar 300, and at least a portion of the heat spreader 400 can be surrounded by the heat transfer material 500. An upper surface of the heat transfer material 500 can be above an upper surface of the leg portion 420 of the heat spreader 400, and the heat transfer material 500 can surround at least a portion of the leg portion 420. After the heat transfer material 500 is applied to the busbar 300 before the cover 200 is applied, the cover 200 can be mounted to the case 100.

[0118] The heat transfer material 500 may correspond to the first bus bar 310. That is, the heat transfer material 500 may be applied to the first bus bar 310. For example, a portion of the heat transfer material 500 may be accommodated in the first recess 312 of the first bus bar 310. The heat transfer material 500 may be accommodated between two legs 420 facing each other of different heat sinks 400. The heat transfer material 500 may be accommodated between two ribs 112 spaced apart in one direction (e.g., the Y-axis direction). Therefore, as Figure 11 As shown in FIG, the heat transfer material 500 can be applied to the area separated by the rib 112, the first bus bar 310, and the leg portion 420. The figure shows that the heat transfer material 500 has a substantially rectangular cross-section, but the shape of the heat transfer material 500 is not limited thereto. For example, the heat transfer material 500 may have a shape that is wider at the bottom due to its own weight.

[0119] The heat transfer material 500 applied to the first bus bar 310 may have an upper surface above the upper surface of the extension portion 421. Therefore, the extension portion 421 may be surrounded by the heat transfer material 500. Therefore, the heat generated from the first bus bar 310 may be smoothly transferred to the heat sink 400 via the heat transfer material 500 through the extension portion 421.

[0120] Both ends of the heat transfer material 500 may be disposed on the first protrusion 311 in the length direction (eg, X-axis direction) of the battery pack 10. The ends of the heat transfer material 500 may be below the leg 420 in the length direction (eg, X-axis direction) of the battery pack 10.

[0121] The heat transfer material 500 may correspond to the second bus bar 320. That is, the heat transfer material 500 may be applied to the second bus bar 320. For example, a portion of the heat transfer material 500 may be accommodated in the second recess 322 of the second bus bar 320. The heat transfer material 500 may cover at least a portion of the leg 420 of one heat sink 400. The heat transfer material 500 may be accommodated between two ribs 112 spaced apart in one direction (e.g., the Y-axis direction). Thus, as Figure 12 As shown in FIG, the heat transfer material 500 can be applied to the area separated by the rib 112, the second bus bar 320, and the leg portion 420. The figure shows that the heat transfer material 500 has a substantially rectangular cross-section, but the shape of the heat transfer material 500 is not limited thereto. For example, the heat transfer material 500 may have a shape that is wider at the bottom due to its own weight.

[0122] The heat transfer material 500 applied to the second bus bar 320 may have an upper surface above the upper surface of the extension portion 421. Therefore, the extension portion 421 may be surrounded by the heat transfer material 500. Therefore, the heat generated from the second bus bar 320 may be smoothly transferred to the heat sink 400 via the heat transfer material 500 through the extension portion 421.

[0123] The heat transfer material 500 can have one end (e.g., an inner end) above the second protruding portion 321 in the length direction (e.g., the X-axis direction) of the battery pack 10. The heat transfer material 500 can have one end below the leg portion 420 in the length direction (e.g., the X-axis direction) of the battery pack 10.

[0124] Figure 12 Only the left end of the heat transfer material 500 corresponding to the second bus bar 320 is illustrated with respect to the drawings. However, the right end of the heat transfer material 500 can be additionally supported by the wall of the upper case 110.

[0125] The heat transfer material 500 can correspond to the third bus bar 330. That is, the heat transfer material 500 can be applied to the third bus bar 330. For example, a portion of the heat transfer material 500 can be accommodated in the third recessed portion 332 of the third bus bar 330. The heat transfer material 500 can cover at least a portion of the leg portion 420 of one heat spreader 400. The heat transfer material 500 can be accommodated between two ribs 112 spaced apart in one direction (e.g., the Y-axis direction). Accordingly, as illustrated in FIG. 6, the heat transfer material 500 can be applied to an area partitioned by the rib 112, the third bus bar 330, and the leg portion 420. The drawings illustrate that the heat transfer material 500 has a substantially rectangular cross-section, but the shape of the heat transfer material 500 is not limited thereto. For example, the heat transfer material 500 can have a shape that is wider at the bottom due to its own weight. Figure 13

[0126] The heat transfer material 500 applied to the third bus bar 330 can have an upper surface above the upper surface of the extension portion 421. Accordingly, the extension portion 421 can be surrounded by the heat transfer material 500 such that heat generated by the third bus bar 330 can be smoothly transferred to the heat spreader 400 through the extension portion 421 via the heat transfer material 500.

[0127] As illustrated in FIG. 6, the heat transfer material 500 corresponding to each of the first bus bar 310, the second bus bar 320, and the third bus bar 330 can cover only the extension portion 421 without contacting the connection portion 422. In addition, the heat transfer material 500 corresponding to each of the first bus bar 310, the second bus bar 320, and the third bus bar 330 can contact the connection portion 422 or cover at least a portion of the connection portion 422. Further, the heat transfer material 500 corresponding to each of the first bus bar 310, the second bus bar 320, and the third bus bar 330 can contact the main body 410 or cover at least a portion of the main body 410. Figure 11 to Figure 13

[0128] ​​The heat transfer material 500 applied to the second bus bar 320 can cover at least a portion of the outer side of the leg portion 420 of the heat sink 400 in the length direction of the battery pack 10. The heat transfer material 500 applied to the third bus bar 330 can cover at least a portion of the outer side of the leg portion 420 of the heat sink 400 in the length direction of the battery pack 10.

[0129] Figure 14 is a cross-sectional view taken along the line A-A' of Figure 3

[0130] Regarding the heat transfer material 500A, Figure 14 The embodiment shown in FIG. 12 can be different from the above-described embodiments. Specifically, the embodiment can further include a wall portion 600A extending upward from the first protruding portion 311A, thereby dividing the heat transfer material 500A applied to the first bus bar 310A into two portions. Other portions and configurations are the same as those of the above-described embodiments. Hereinafter, the wall portion 600A will be mainly described. Figure 14 The configurations not shown in FIG. 12 are the same as those of the above-described embodiments, and the reference numerals are the same as those in the above-described embodiments.

[0131] The heat transfer material 500A corresponding to the first bus bar 310A can be received on the first protruding portion 311A and in the first recessed portion 312A of the first bus bar 310A. The heat transfer material 500A can be supported by the rib 112A and cover the extension portion 421A of the leg portion 420A of the heat sink 400A. The heat transfer material 500A can not be in contact with the connecting portion 422A. In other embodiments, the heat transfer material 500A can be in contact with or cover at least a portion of the connecting portion 422A. The heat transfer material 500A can be in contact with or cover at least a portion of the main body 410A. The heat transfer material 500A corresponding to the first bus bar 310A can be applied to an area divided between the first bus bar 310A, the rib 112A, and the two leg portions 420A.

[0132] The wall portion 600A can be formed above the first bus bar 310A. As Figure 14 ​As shown in FIG. 6, the wall portion 600A can be above the first protruding portion 311A of the first bus bar 310A and protrude to a certain height. The height of the wall portion 600A can be higher than the upper end of the rib 112A, the upper end of the first bus bar 310A, and the upper end of the extension portion 421A. The height of the wall portion 600A can be the same as, lower than, or higher than the upper surface of the main body 410A. One wall portion 600A that separates the heat transfer material 500A into two portions with respect to the first protruding portion 311A and supports the heat transfer material 500A can be provided for each first bus bar 310A. Accordingly, the shape of the heat transfer material 500A can be more reliably maintained so that the heat transfer material 500A can have a height higher than that of the extension portion 421A. The heat transfer material 500A can be applied to the first recessed portion 312A where heat is concentrated in the first bus bar 310A, thereby increasing the heat dissipation efficiency with respect to the total amount of the heat transfer material 500A.

[0133] A battery pack according to an embodiment can include a heat spreader and a heat transfer material, thereby effectively dissipating heat generated in a battery cell and a bus bar to the outside of the battery pack.

[0134] It should be understood that the embodiments described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as being applicable to other similar features or aspects in other embodiments. While one or more embodiments have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details can be made therein without departing from the spirit and scope of the present disclosure.

Claims

1. A battery pack, characterized in that: The battery pack includes: a plurality of battery cells, each battery cell of the plurality of battery cells comprising a vent; a housing for accommodating the plurality of battery cells; a cover covering an upper surface of the housing; a bus bar connecting the plurality of battery cells to each other; a heat sink located on the cover; and a heat transfer material applied to the bus bar and covering at least a portion of the heat sink, The heat sink includes: a main body including a plurality of windows, the plurality of windows being positioned to correspond to the exhaust ports of the plurality of battery cells; and a leg portion extending from the main body toward the bus bar.

2. The battery pack according to claim 1, wherein: The leg portion is spaced apart from the bus bar in a height direction of the battery pack.

3. The battery pack according to claim 1, wherein: The leg comprises: a connecting portion extending downward from the main body; and An extension portion extends from the connecting portion along a length direction of the battery pack and is at least partially surrounded by the heat transfer material.

4. The battery pack according to claim 3, wherein: An upper surface of the heat transfer material is located above an upper surface of the extension portion.

5. The battery pack according to claim 1, wherein: The bus bar includes at least one protrusion and at least one recess formed therein, and wherein the heat transfer material is applied to the at least one raised portion and the at least one recessed portion.

6. The battery pack according to claim 1, wherein: The housing includes a detachable upper case including a rib extending in a length direction of the battery pack, and the heat transfer material is accommodated between the bus bar and the rib.

7. The battery pack according to claim 6, characterized in that: The ribs include a plurality of ribs arranged side by side in the length direction of the battery pack, and the plurality of ribs partition regions in the outer case where the plurality of battery cells are accommodated.

8. The battery pack according to claim 6, wherein: An upper end of the rib is located above an upper surface of the bus bar.

9. The battery pack according to claim 1, wherein: The bus bars include a first bus bar, a second bus bar, and a third bus bar connecting the plurality of battery cells to each other, and wherein the heat transfer material is applied to each of the first bus bar, the second bus bar, and the third bus bar.

10. The battery pack according to claim 9, wherein: The first bus bar is located at the center of the battery pack in the longitudinal direction, and the first bus bar includes a protrusion and a recessed portion adjacent to the protrusion. Wherein, the radiator includes two radiators facing each other, and The heat transfer material is accommodated on the protrusion and in the recess, and between the two heat sinks.

11. The battery pack according to claim 10, wherein: At least a portion of the leg is located above the recess.

12. The battery pack according to claim 10, wherein: The battery pack further includes a wall portion extending upward from the protrusion and dividing the heat transfer material applied to the first bus bar into two parts.

13. The battery pack according to claim 9, wherein: The second bus bar includes a plurality of second bus bars located on both sides of the battery pack in a length direction, each of the plurality of second bus bars includes a protrusion and a recessed portion adjacent to the protrusion, and the heat transfer material is accommodated on the protrusion and in the recessed portion.

14. The battery pack according to claim 13, wherein: The convex portion has a T-shape, the concave portion includes two concave portions facing each other with a portion of the convex portion disposed between the two concave portions, and the two concave portions correspond to different battery cells among the plurality of battery cells.

15. The battery pack according to claim 13, wherein: The heat transfer material applied to the second bus bar covers at least a portion of the leg portion of the heat sink in the length direction of the battery pack.

16. The battery pack according to claim 13, wherein: At least a portion of the leg of the heat sink is located above the recess.

17. The battery pack according to claim 9, wherein: The third bus bar is located on one side of the battery pack in the length direction, and the third bus bar includes a protrusion and a recessed portion adjacent to the protrusion, and The heat transfer material is accommodated on the raised portion and in the recessed portion.

18. The battery pack according to claim 17, wherein: The third bus bar includes a connection portion adjacent to the recessed portion, and The heat transfer material is applied to the connection portion and covers at least a portion of the leg portion of the heat sink in the length direction of the battery pack.

19. The battery pack according to claim 17, wherein: At least a portion of the leg portion of the heat sink is located above the recessed portion.

20. A battery pack, characterized in that: The battery pack includes: a plurality of battery cells, each battery cell of the plurality of battery cells comprising a vent; an outer case accommodating the plurality of battery cells and comprising an upper case including ribs; a cover covering an upper surface of the housing; a bus bar connecting the plurality of battery cells to each other, wherein the bus bar includes at least one protrusion and at least one recess; a heat sink located on the cover, the heat sink comprising: a body including a plurality of windows positioned to correspond to the exhaust ports of the plurality of battery cells; and a leg extending from the body toward the bus bar and located above an upper surface of the bus bar; and A heat transfer material is received on the at least one protrusion, in the at least one recess, on the ribs, and covers at least a portion of the heat sink.

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