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.

Description

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

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

[0003] Unlike non-rechargeable primary batteries, secondary batteries refer to batteries that are chargeable and dischargeable. Secondary batteries are used as energy sources for mobile devices, electric vehicles, hybrid vehicles, electric bicycles, uninterruptible power supplies, etc. Depending on the type of external device to which they are applied, secondary batteries are used in the form of a single battery or in the form of a group in which a plurality of battery cells are connected and grouped into one unit.

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

[0005] The background art described herein is technical information possessed by the inventors in order to derive the present disclosure or acquired in the process of deriving the present disclosure, and is not necessarily known art disclosed to the general public before filing the present disclosure. Summary of the invention

[0006] One or more embodiments include a battery pack that can effectively discharge heat generated from a bus bar 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 which follows and will be apparent from the description, or may be learned by practice of the presented embodiments of the disclosure.

[0009] According to one or more embodiments, a battery pack includes: a plurality of battery cells, each of the battery cells including an exhaust port; a housing that accommodates the battery cells; a cover that covers an upper surface of the housing; a bus bar that connects the 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, 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 extending from the main body toward the bus bar.

[0010] The legs may be spaced apart from the bus bar in a height direction.

[0011] The leg portion may 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 may be located above an upper surface of the extension.

[0013] The heat transfer material may be applied to one or more raised portions and one or more depressed portions formed in the bus bar.

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

[0015] The rib may include a plurality of ribs arranged side by side in a length direction of the battery pack, and the plurality of ribs partition regions accommodating the battery cells in the case.

[0016] An upper end of the rib may be located above an upper surface of the bus bar.

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

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

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

[0020] The battery pack may 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 parts.

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

[0022] The second convex portion may have a T-shape, the second concave portion may include two second concave portions facing each other with a portion extending from the second convex portion disposed between the two concave portions, and the two second concave portions may correspond to different battery cells.

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

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

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

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

[0027] At least a portion of the leg of the heat sink may 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 an exhaust port; a housing that accommodates the battery cells and includes an upper shell, the upper shell including ribs; a cover that covers an upper surface of the housing; a bus bar that connects the plurality of battery cells to each other and includes at least one protrusion and at least one recess; a heat sink located on the cover, the heat sink including a main body and legs, the 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, the legs extending from the main body toward the bus bar and being located above the upper surface of the bus bar; and a heat transfer material accommodated on at least one protrusion, in at least one recess, on the ribs, and covering at least a portion of the heat sink. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other aspects, features and advantages of certain embodiments of the present disclosure will be more apparent through the following description in conjunction with the accompanying drawings, in which: Figure 1 A battery pack is shown; Figure 2 Shows Figure 1 An exploded perspective view of a battery pack; Figure 3 A portion of the housing, bus bars and heat sink are shown; Figure 4 A portion of the housing and the bus bars are shown; Figure 5 is an enlarged view of the busbar and heat sink mounted on the housing; Figure 6 A first bus bar is shown; Figure 7 A second bus bar is shown; Figure 8 A third bus bar is shown; Fig. 9 A cover is shown with a radiator mounted thereon; Fig.10 A heat sink is shown; Fig.11 It is along Figure 3 A cross-sectional view taken along line AA'; Fig.12 It is along Figure 3 A cross-sectional view taken along line BB'; Fig.13 It is along Figure 3 A cross-sectional view taken along line CC'; and Fig.14 According to the embodiment along Figure 3 A cross-sectional view taken along line AA'. DETAILED DESCRIPTION

[0030] Reference will now be made in detail to embodiments, examples of which are shown in the accompanying drawings, wherein the same reference numerals always refer to the same elements. In this regard, the embodiments presented may have different forms and should not be construed as being limited to the descriptions set forth herein. Therefore, embodiments are described below with reference to the drawings to explain aspects of this specification. As used herein, the term "and / or" includes any and all combinations of one or more of the related listed items. A statement such as "at least one (kind / person) of..." modifies the entire column of elements, without modifying the individual elements of the column, if it is after a column of elements.

[0031] By referring to the detailed description and the accompanying drawings of the embodiments, it is easier to understand the aspects of some embodiments of the present disclosure and the methods for realizing them. Hereinafter, the embodiments will be described in more detail with reference to the accompanying drawings. However, the described embodiments may have various modifications and may be implemented in different forms, and should not be interpreted as being limited to the embodiments shown here. In addition, the various features of the various embodiments of the present disclosure may be combined or merged with each other in part or in their entirety, and various interlocks and drives are technically possible. Each embodiment may be implemented independently of each other, or may be implemented together in association. The described embodiments are provided as examples so that the present disclosure will be thorough and complete, and the aspects of the present disclosure will be fully conveyed to those skilled in the art. It should be understood that the present disclosure covers all modifications, equivalents and substitutions within the concept and technical scope of the present disclosure. Therefore, processes, elements and techniques that are not necessary for those of ordinary skill in the art to fully understand the aspects of the present disclosure may not be described.

[0032] Unless otherwise noted, throughout the drawings and written description, the same reference numerals, characters, or combinations thereof denote the same elements, and thus, description thereof will not be repeated. In addition, parts that are not relevant or associated with the description of the embodiments may not be shown to make the description clear.

[0033] In the drawings, the relative sizes of elements, layers, and regions may be exaggerated for clarity. In addition, the use of cross-hatching and / or shading is often provided in the drawings to make the boundaries between adjacent elements clear. As such, unless otherwise stated, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for a particular material, material property, size, ratio, commonality between the illustrated elements, and / or any other characteristic, attribute, property, etc. of an element.

[0034] Various embodiments are described herein with reference to cross-sectional views as schematic diagrams of embodiments and / or intermediate structures. As such, variations in the illustrated shapes caused by, for example, manufacturing techniques and / or tolerances are anticipated. In addition, for the purpose of describing embodiments according to the concepts of the present disclosure, the specific structural or functional descriptions disclosed herein are merely illustrative. Therefore, the embodiments disclosed herein should not be interpreted as being limited to the illustrated regional shapes, but rather include shape deviations caused by, for example, manufacturing.

[0035] For example, an implanted region illustrated as a rectangle may have rounded or curved features and / or a gradient of implant concentration at its edges rather than a binary change from implanted to non-implanted region. Likewise, a buried region formed by implantation may result in some implantation in the region between the buried region and the surface through which the implantation takes place.

[0036] Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to be limiting. In addition, as will be appreciated by those skilled in the art, the described embodiments may be modified in various ways, all without departing from the spirit or scope of the present disclosure.

[0037] In the detailed description, for the purpose of explanation, numerous specific details are set forth to provide a thorough understanding of various embodiments. However, it is apparent 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 to avoid unnecessarily obscuring various embodiments.

[0038] For ease of explanation, spatially relative terms such as "under...", "below...", "lower part", "lower side", "below...", "above...", "upper part", "upper side", etc. may be used here to describe the relationship between one element or feature and another element or feature as shown in the figure. It will be understood that, in addition to the orientation depicted in the figure, the spatially relative terms are intended to cover different orientations of the device in use or in operation. For example, if the device in the figure is turned over, the element described as "under", "under" or "below" other elements or features will then be oriented to be "above" the other elements or features. Therefore, the example terms "under..." and "under..." can cover both upper and lower orientations. The device can be oriented in addition (for example, rotated 90 degrees or in other orientations), and the spatially relative descriptors used here should be interpreted accordingly. Similarly, when a first part is described as being arranged "on" a second part, this means that the first part is arranged at the upper or lower side (not limited to its upper side) of the second part based on the direction of gravity.

[0039] Further, the phrase "in a plan view" refers to when viewing the object portion from above, and the phrase "in a schematic cross-sectional view" refers to when viewing a schematic cross-section taken by vertically cutting the object portion from the side. The term "superimposed" or its variants refers to the first object can be above or below or on the side of the second object, and vice versa. In addition, the term "superimposed" may include stacking, stacking, facing or facing, extending on ..., covering or partially covering or any other suitable term as will be appreciated and understood by a person of ordinary skill in the art. The expression "non-superimposed" may include meanings such as "spaced apart from ... " or "placed outside ... " or "offset from ... " and any other suitable equivalents as will be appreciated and understood by a person of ordinary skill in the art. The terms "facing" and "facing" may indicate that the first object may be directly or indirectly opposite to the second object. In the case where a third object is placed between the first object and the second object, the first object and the second object may be understood to be indirectly opposite to each other, although still facing each other.

[0040] It will be understood that when an element, layer, region, or component is referred to as being "formed on," "on" another element, layer, region, or component, "connected to," or "(operably or communicatively) coupled to" another element, layer, region, or component, it may be directly formed on, directly on, directly connected to, or directly coupled to the other element, layer, region, or component, or indirectly formed on, indirectly on, indirectly connected to, or indirectly coupled to the other element, layer, region, or component, such that one or more intervening elements, layers, regions, or components may be present. Additionally, this may be collectively referred to as being directly coupled or coupled or indirectly coupled or coupled, and integrally coupled or non-integrally coupled or coupled. 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 may be directly electrically connected to or directly electrically coupled to the other layer, region, and / or component, or there may be intervening layers, regions, or components. However, "direct connection / direct combination" or "directly on..." refers to a component that is directly connected or combined with another component, or directly on another component, without an intermediate component. In addition, in this specification, when a part of a layer, film, region, plate, etc. is formed on another part, the formation direction is not limited to the upper direction, but includes forming the part on the side surface or in the lower direction. On the contrary, when a part of a layer, film, region, plate, etc. is formed "below" another part, this includes not only the situation where the part is "directly under" another part, but also the situation where there is another part between the part and the other part. At the same time, 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 "between" two elements or layers, it can be the only element or layer between the two elements or layers, or one or more intermediate elements or layers may also be present.

[0041] For the purpose of this disclosure, expressions such as "at least one of ... " or "any one of ... ", when following a list of elements, modify the entire list of elements without modifying the individual elements of the list. For example, "at least one of X, Y, and Z", "at least one of X, Y, or Z", "at least one of the group consisting of X, Y, and Z", and "at least one of the group consisting of X, Y, or Z" can be interpreted as only X, only Y, only Z, any combination of two or more of X, Y, and Z (such as XYZ, XYY, YZ, and ZZ as examples) or any variation thereof. Similarly, expressions such as "at least one of A and B" and "at least one of A or B" may include A, B, or A and B. As used herein, "or" generally refers to "and / or", and the term "and / or" includes any combination and all combinations of one or more of the relevant listed items. For example, expressions such as "A and / or B" may include A, B, or A and B. Similarly, expressions such as "at least one of," "a plurality of," "one of," and other prepositional phrases when preceding or following a list of elements modify the entire list of elements rather than the individual elements in the list.

[0042] It will be understood that, although the terms "first", "second", "third", etc. can be used here to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are used to distinguish an element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the spirit and scope of the present disclosure, the first element, component, region, layer or part described below can be referred to as the second element, component, region, layer or part. Describing an element as a "first" element may not require or imply the presence of a second element or other elements. The terms "first", "second", etc. can also be used here to distinguish elements of different categories or groups. For simplicity, the terms "first", "second", etc. can respectively represent "first category (or first group)", "second category (or second group)", etc.

[0043] The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular forms "one" and "one (kind / person)" are also intended to include plural forms, and plural forms are also intended to include singular forms. It will also be understood that when the terms "comprise", "have", "include" and variations thereof are used in this specification, the stated features, integers (entirety), steps, operations, elements and / or components are indicated, but the presence or addition of one or more other features, integers (entirety), steps, operations, elements, components and / or their groups are not excluded.

[0044] When one or more embodiments can be implemented differently, a specific process order can be performed differently from the described order. For example, two consecutively described processes can be performed substantially simultaneously or in a reverse order to the described order.

[0045] As used herein, the terms "substantially," "about," "approximately," and similar terms are used as approximate terms rather than as terms of degree, and are intended to account for the inherent deviations in measured or calculated values ​​that one of ordinary skill in the art would recognize. Taking into account the measurements in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system), as used herein, "about" or "approximately" includes the stated value and refers to within an acceptable range of deviations for the particular value as determined by one of ordinary skill in the art. For example, "about" may mean within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the stated value. In addition, when describing embodiments of the present disclosure, the use of "may" refers to "one or more embodiments of the present disclosure."

[0046] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as that commonly understood by those skilled in the art to which the present disclosure belongs. It will also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and / or this specification, and should not be interpreted in an idealized or overly formal sense, unless explicitly defined as such herein.

[0047] Figure 1 A battery pack 10 is shown. Figure 2 Shows Figure 1 1 is 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 a bus bar 300 are shown. Figure 5 is an enlarged view of the busbar and heat sink mounted on the housing. Figure 6 A first bus bar 310 is shown. Figure 7 A second bus bar 320 is shown. Figure 8 A third bus bar 330 is shown. Fig. 9 A cover is shown with a heat sink 400 mounted thereon. Fig.10 A heat sink 400 is shown. Fig.11 It is along Figure 3 A cross-sectional view taken along line AA'. Fig.12 It is along Figure 3 A cross-sectional view taken along line BB'. Fig.13 It is along Figure 3 A cross-sectional view taken along line CC'.

[0048] The battery pack 10 including a plurality of battery cells C may be applied to large applications such as an energy storage system (ESS). For example, the battery pack 10 may be applied to power commercial applications, home applications, communication applications, or an uninterruptible power supply (UPS). For example, the battery pack 10 may be applied to a vehicle battery or small and medium-sized applications such as a desktop computer, a tablet computer, a smart phone, or a laptop computer.

[0049] The battery pack 10 may include a case 100 accommodating a plurality of battery cells C, a cover 200 covering an upper surface of the case 100, a bus bar 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 bus bar 300 and covering at least a portion of the heat sink 400. The heat sink 400 may include a body 410 including a plurality of windows 411 corresponding to exhaust ports of the plurality of battery cells C, and the heat sink 400 may include a leg 420 extending downward from the body 410 toward the bus bar 300.

[0050] The housing 100 may include an upper case 110 accommodating a plurality of battery cells C and an upper case 110 extending in a direction (eg, a length direction of the battery pack 10 or a length direction of the battery pack 10). Figure 3 The cover 200 covers the upper surface of the housing 100. The bus bar 300 connects the plurality of battery cells C to each other and includes 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 and a leg 420, the main body 410 including a plurality of windows 411 corresponding to exhaust ports of the plurality of battery cells C, and the leg 420 extending downward from the main body 410 toward the bus bar 300 (but the leg 420 is spaced apart upward from the upper surface of the bus bar 300). The heat transfer material 500 is accommodated on one or more protrusions, in one or more recesses, and on the rib 112 so as to cover at least a portion of the heat sink 400.

[0051] The battery cell C included in the battery pack 10 may have a prismatic shape, a pouch shape, or a cylindrical shape. Hereinafter, for the sake of convenience of description, the battery cell C is mainly described as having a prismatic shape. There may be a plurality of battery cells C. The number of battery cells C may be selected according to the specifications of the battery pack 10. For example, one battery pack 10 may include a total of eight battery cells C. As another example, one battery pack 10 may include eight or less or eight or more battery cells C. Hereinafter, for the sake of convenience of description, a total of eight battery cells C are mainly described in one battery pack 10.

[0052] Multiple battery cells C can be connected in series and / or in parallel with each other. For example, eight battery cells C can be connected in series in pairs, so that four pairs of battery cells C connected in series are formed, and the four pairs of battery cells C can be connected in parallel with each other. Therefore, multiple battery cells C can be connected to each other in different series / parallel structures.

[0053] The battery pack 10 may include a case 100 , a cover 200 , a bus bar 300 , a heat sink 400 , and a heat transfer material 500 .

[0054] The housing 100 may contain a plurality of battery cells C. For example, the housing 100 may include an internal space and have a substantially rectangular parallelepiped shape. The housing 100 may include one or more heat dissipation slits in at least one surface. The housing 100 may include an internal space separated by a plurality of side surfaces and a bottom surface, and a plurality of battery cells C may be contained in the internal space.

[0055] The housing 100 may include an upper housing 110. The upper housing 110 may be detachably coupled to the housing 100. When the upper housing 110 is separated from the housing 100, a plurality of battery cells C may be accommodated in the housing 100, and thereafter, the upper housing 110 may be mounted on the housing 100. The upper housing 110 may be mounted on an upper portion of the housing 100, and may include a vent hole 111, a rib 112, and a partition wall 113.

[0056] The exhaust hole 111 may include a plurality of exhaust holes 111 corresponding to the 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 may 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 hole 111 may correspond to the window 411 formed in the body 410 of the heat sink 400. The exhaust hole 111 may extend upward to a certain height so that its upper end may face the first heat dissipation slit 210 formed in the cover 200. Therefore, the exhaust hole 111 may minimize the transmission of the gas discharged from the exhaust holes of the battery cells C to other parts of the battery pack 10.

[0057] The rib 112 may be included in the upper case 110 and may partition an area in which a plurality of battery cells C are accommodated. The rib 112 may include a plurality of ribs 112. The plurality of ribs 112 may be provided inside the upper case 110 along a length direction of the battery pack 10 (eg, Figure 3 The ribs 112 may be arranged in parallel with the upper surface of the plurality of battery cells C. The ribs 112 may protrude upward more than the upper surface 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 may protrude further above the upper surface of the bus bar 300.

[0058] The plurality of ribs 112 may be spaced apart in the width direction (e.g., the Y-axis direction) of the battery pack 10, and the plurality of battery cells C may be disposed between the ribs 112. Two battery cells C may be disposed between the plurality of ribs 112 in one direction (e.g., the X-axis direction) and may be connected in series with each other. The ribs 112 may be formed over the entire length of the upper case 110. The ribs 112 may be spaced apart in the length direction (e.g., the Y-axis direction) of the upper case 110. Figure 3 It is formed discontinuously in the X-axis direction).

[0059] The upper end of the rib 112 may be above the bus bar 300 and below the heat sink 400. The upper end of the rib 112 may be above the bus bar 300 and the heat sink 400.

[0060] The partition wall 113 may extend across the upper housing 110. For example, the partition wall 113 may extend in the width direction (eg, Y-axis direction) of the battery pack 10 and be disposed in the length direction (eg, Figure 4 The ribs 112 may separate regions in which a plurality of battery cells C are installed in the width direction of the battery pack 10, and the partition walls 113 may separate regions in which a plurality of battery cells C are installed in the length direction of the battery pack 10.

[0061] The upper end of the rib 112 may be above the upper end of the partition wall 113. The upper end of the rib 112 may be above the upper surface of the bus bar 300. Therefore, when the heat transfer material 500 is applied to the bus bar 300, the heat transfer material 500 may be stably held and supported by the rib 112.

[0062] The cover 200 may be detachably mounted on the upper surface of the housing 100 so as to cover the housing 100. Figure 1 and Figure 2As shown in , the cover 200 may be disposed 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 shell 110 to cover the upper shell 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 shell 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 shell 110. The heat sink 400 may be mounted inside the cover 200.

[0063] 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 heat generated by the battery pack 10 may be discharged 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.

[0064] 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. Figure 1 As shown in , 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 The concave portion may be formed on both sides of the battery pack 10 in the X-axis direction, and a plurality of second heat dissipation slits 220 may be formed in the concave portion. A convex portion may be formed at 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 .

[0065] 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. Figure 1As shown in , a plurality of second heat dissipation slits 220 may be formed at the outermost side of the battery pack 10 in the length direction, and the plurality of second heat dissipation slits 220 may be arranged in parallel with the length direction of the battery pack 10. The first heat dissipation slit 210 may be arranged inside the second heat dissipation slit 220 in the length direction of the battery pack 10 and arranged differently from the second heat dissipation slit 220 (e.g., arranged in parallel with the width direction of the battery pack 10). In addition, the third heat dissipation slit 230 may be arranged inside the first heat dissipation slit 210 in the length direction of the battery pack 10 and arranged identically to the first heat dissipation slit 210 (e.g., arranged in parallel with the width direction of the battery pack 10). Therefore, the heat and gas generated from the battery pack 10 may be smoothly discharged to the outside of the battery pack 10.

[0066] Figure 1 It is shown that the plurality of first heat dissipation slits 210, the second heat dissipation slits 220, and the third heat dissipation slits 230 are 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, the second heat dissipation slits 220, and the third heat dissipation slits 230 may be arranged in various directions and angles.

[0067] The bus bar 300 can electrically connect multiple battery cells C to each other. The bus bar 300 can be a conductor, such as a metal such as aluminum or copper. The bus bar 300 can be set on one side (e.g., 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.

[0068] 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 .

[0069] The first bus bar 310 may be at the center of the battery pack 10 in the length 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 length direction (eg, X-axis direction) of the battery pack 10 in series. Figure 4As shown in FIG. 1 , a plurality of (e.g., four) first bus bars 310 may be arranged side by side in the width direction (e.g., Y-axis direction) of the battery pack 10. Each of the first bus bars 310 may connect two battery cells C in series, and the two battery cells C connected in series may be connected to each other in parallel through the second bus bar 320. Both sides of the first bus bar 310 may contact two adjacent battery cells C.

[0070] like Figure 6 As shown in FIG. 1 , the first bus bar 310 may include a first protrusion 311 and a first recess 312. The first protrusion 311 may be formed at the center of the first bus bar 310 in the length direction (e.g., the X-axis direction) and formed on both sides spaced apart from the center. The upper surface of the first protrusion 311 may be lower than the upper end of the rib 112 and / or the lower end of the heat sink 400.

[0071] The first recessed portion 312 may be formed between the first protruding portions 311. The first recessed portion 312 and the first protruding portion 311 may 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 may be an inclined surface. At least a portion of the leg portion 420 may be above the first recessed portion 312.

[0072] The first hole 3121 may be formed in the first recessed portion 312. The first hole 3121 may be an element for welding (eg, laser welding or ultrasonic welding) the battery cell C and the first bus bar 310. The first hole 3121 may discharge gas generated in the battery cell C to the outside of the battery pack 10, or wiring may enter the battery pack 10 through the first hole 3121.

[0073] The first bus bar 310 may be at the center in the length direction of the battery pack 10, and the first bus bar 310 may include a first protrusion 311 and a first depression 312 adjacent to the first protrusion 311. The heat transfer material 500 may be accommodated on the first protrusion 311 and in the first depression 312, and may be between two heat sinks 400 facing each other.

[0074] The second bus bar 320 may connect the battery cells C to each other. The second bus bar 320 may 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 may connect two battery cells C connected in series by the first bus bar 310. Figure 4 As shown in FIG. 1 , each of the second bus bars 320 may have a flat square plate shape, and there may be two second bus bars 320 at the first end and one second bus bar 320 at the second end in the length direction of the battery pack 10 (eg, Figure 4The second bus bar 320 may connect two pairs of battery cells C connected in series in parallel to each other. Both sides of the second bus bar 320 may contact two adjacent battery cells C.

[0075] The second bus bar 320 may include a second protrusion 321 and a second depression 322. Figure 7 As shown in FIG. 1 , 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 .

[0076] The second recessed portion 322 may be formed adjacent to the second raised portion 321. The second recessed portion 322 may be formed such 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. 1 , the two second recessed portions 322 face each other, and a portion extending from the second convex portion 321 having a T-shape in one direction (eg, the X-axis direction) 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.

[0077] The second recessed portion 322 and the second raised portion 321 may 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 may be an inclined surface. At least a portion of the leg portion 420 of the heat sink 400 may be located above the second recessed portion 322.

[0078] The second hole 3221 may be formed in the second recessed portion 322. The second hole 3221 may be an element for welding (eg, 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 wiring may enter the battery pack 10 through the second hole 3221.

[0079] 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 convex portion 321 and a second concave portion 322 adjacent to the second convex portion 321. The heat transfer material 500 may be accommodated on the second convex portion 321 and in the second concave portion 322.

[0080] 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 (eg, Figure 4 The second end of the X-axis direction) (for example, relative to Figure 4 The two third bus bars 330 may be connected to different battery cells C, respectively. The other side of the third bus bar 330 may be connected to an external controller (such as a BMS). Figure 4 As shown in , two third bus bars 330 may face each other, and the second bus bar 320 is 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 bent substantially vertically. The two third bus bars 330 may be spaced apart from each other in the width direction (e.g., Y-axis direction) of the battery pack 10, and one second bus bar 320 may be disposed between the third bus bars 330.

[0081] like Figure 8 As shown in FIG. , the third bus bar 330 may include a third convex portion 331 , a third concave portion 332 , a connecting portion 333 , and a contact portion 334 .

[0082] The third protrusion 331 may be formed on one side of the third bus bar 330, for example, on an 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 formed from the connection portion 333 in the height direction of the battery pack 10 (for example, Figure 8 The contact portion 334 may be exposed to the outside of the housing 100 while the third bus bar 330 is in contact with the battery cell C. Therefore, an external device may be connected to the third bus bar 330 through the exposed contact portion 334.

[0083] The third protrusion 331, the third depression 332, and the connection 333 may 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 333 and the third depression 332 may be an inclined surface. At least a portion of the leg 420 of the heat sink 400 may be above the third depression 332.

[0084] The third hole 3321 may be formed in the third recessed portion 332. The third hole 3321 may be an element for welding (eg, laser welding or ultrasonic welding) the battery cell C and the third bus bar 330. The third hole 3321 may discharge gas generated in the battery cell C to the outside of the battery pack 10, or wiring may enter the battery pack 10 through the third hole 3321.

[0085] The third bus bar 330 may be located on one side in the length direction of the battery pack 10 and include a third convex portion 331 and a third concave portion 332 adjacent to the third convex portion 331. The heat transfer material 500 may be received on the third convex portion 331 and in the third concave portion 332.

[0086] The third bus bar 330 may include a connection portion 333 adjacent to the third recess 332. The heat transfer material 500 applied to the third bus bar 330 may also be applied to the connection portion 333 and cover at least a portion of the outer leg portion 420 of the heat sink 400 in the length direction of the battery pack 10.

[0087] The heat sink 400 may be located on the plurality of bus bars 300. The heat sink 400 may be on one side of the cover 200 and is 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. Fig. 9 As shown in FIG. 1 , the heat sink 400 may be located on the upper inner surface of the cover 200 and on the plurality of bus bars 300. The heat sink 400 may correspond to the exhaust holes of the plurality of battery cells C and be spaced apart from the plurality of battery cells C. The heat sink 400 may be spaced apart from the plurality of bus bars 300 to prevent short circuits. The heat sink 400 may be disposed in the height direction of the battery pack 10 (e.g., Figure 2 The heat transfer material 500 may be applied in the gap. The heat transfer material 500 may 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 may discharge the heat to the outside of the battery pack 10 through the heat dissipation slits of the cover 200. The heat sink 400 may include a material having excellent thermal conductivity, for example, aluminum or copper.

[0088] There may be multiple heat sinks 400. For example, Figure 2As 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.

[0089] The heat sink 400 may include a body 410 and legs 420 .

[0090] The 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 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 cells 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. Fig.10 As shown in FIG. 4 , the window 411 may be rectangular, but may be circular, elliptical, or polygonal in other embodiments. 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 .

[0091] The leg 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 420 may be below the body 410 and closer to the bus bar 300. For example, Fig.10 As shown in FIG. 4 , the leg 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 leg 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 leg 420 may be located in the height direction (e.g., Figure 5 The bus bar 300 is spaced apart from the bus bar 300 in the Z-axis direction.

[0092] Each of the legs 420 may include an extension 421 and a connection 422. The extension 421 may be connected to the main body 410 through the connection 422 extending downward from the main body 410, and transfer the heat generated from the bus bar 300 to the main body 410. The extension 421 may extend in parallel to the main body 410 and / or the bus bar 300 in one direction (e.g., the X-axis direction). The extension 421 may be below the main body 410. The upper surface of the extension 421 may be below the lower surface of the main body 410. The extension 421 may extend from the connection 422 along the length direction of the battery pack 10, and at least a portion of the extension 421 may be surrounded by the heat transfer material 500.

[0093] The extension portion 421 may correspond to the bus bar 300. Fig.11 and Fig.12 As shown in , the plurality of legs 420 of the heat sink 400 may be located above the first bus bar 310 and the second bus bar 320. Fig.11 and Fig.13 As shown in , the plurality of legs 420 may be located above the first bus bar 310 and the third bus bar 330 .

[0094] When the heat transfer material 500 is applied to the bus bar 300, the extension portion 421 may be surrounded by the heat transfer material 500. Since the extension portion 421 may be surrounded by the heat transfer material 500, heat may be effectively transferred from the heat transfer material 500 to the heat sink 400.

[0095] In the heat sink 400 corresponding to the first bus bar 310 , a first end of the extension portion 421 may be above the first protrusion portion 311 , and a second end of the extension portion 421 may be above the first depression portion 312 .

[0096] In the heat sink 400 corresponding to the second bus bar 320 , one end of the extension portion 421 may be above the second protrusion portion 321 , and the other end of the extension portion 421 may be above the second depression portion 322 .

[0097] In the heat sink 400 corresponding to the third bus bar 330 , a first end of the extension portion 421 may be located above the third protrusion portion 331 , and a second end of the extension portion 421 may be located above the third depression portion 332 .

[0098] The heat transfer material 500 may be disposed on the bus bar 300 and transfer the heat discharged from the plurality of battery cells C and the bus bar 300 to the heat sink 400. The heat transfer material 500 may be viscous and applied between the bus bar 300 and the heat sink 400. The heat transfer material 500 may be, for example, a polymer such as dimethylsiloxane resin, epoxy resin, acrylate resin, organic polysiloxane resin, polyimide resin, fluorocarbon resin, benzocyclobutene resin, fluorinated polyallyl ether resin, polyamide resin, polyimide amide resin, cyanate resin, phenolic resin, aromatic polyester resin, polyphenylene ether resin, bismaleimide triazine resin, fluororesin, or a combination or blend of these polymers. The heat transfer material 500 may be applied on one or more protrusions formed on the bus bar 300 and in one or more recesses.

[0099] The heat transfer material 500 may be applied to the bus bar 300 and then cured by a specific post-process such as heating so that the cured heat transfer material 500 maintains its shape. In another embodiment, the heat transfer material 500 may have a high viscosity to maintain substantially the same shape as the initially applied shape without a separate post-process.

[0100] The upper surface of the heat transfer material 500 applied to the bus bar 300 may be above the upper surface of the extension 421. Therefore, the extension 421 may be surrounded by the heat transfer material 500 so that the heat generated by the bus bar 300 may be smoothly transferred to the heat sink 400 through the extension 421 via the heat transfer material 500.

[0101] The heat transfer material 500 may contact the connection portion 422 or cover at least a portion of the connection portion 422. The heat transfer material 500 may contact the body 410 or cover at least a portion of the body 410.

[0102] The housing 100 may include an upper case 110 detachably mounted on an upper portion thereof. Figure 4 As shown in , the upper case 110 may include a rib 112 extending in the length direction of the battery pack 10 , and the heat transfer material 500 may be accommodated between the bus bar 300 and the rib 112 .

[0103] The heat transfer material 500 may be applied to the area partitioned by the bus bar 300 and the heat sink 400. The heat transfer material 500 may cover at least a portion of the bus bar 300, and at least a portion of the heat sink 400 may be surrounded by the heat transfer material 500. The upper surface of the heat transfer material 500 may be above the upper surface of the leg 420 of the heat sink 400, and the heat transfer material 500 may surround at least a portion of the leg 420. After applying the heat transfer material 500 to the bus bar 300 before covering the cover 200, the cover 200 may be mounted on the housing 100.

[0104] The heat transfer material 500 may correspond to the first bus bar 310. That is, the heat transfer material 500 may be applied on 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 the 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). Thus, as Fig.11 As shown in FIG, the heat transfer material 500 may be applied to the area separated by the rib 112, the first bus bar 310 and the leg 420. The drawings show 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.

[0105] The heat transfer material 500 applied to the first bus bar 310 may have an upper surface above the upper surface of the extension 421. Therefore, the extension 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 through the extension 421 via the heat transfer material 500.

[0106] 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.

[0107] The heat transfer material 500 may correspond to the second bus bar 320. That is, the heat transfer material 500 may be applied on 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). Fig.12 As shown in , the heat transfer material 500 can be applied to the area separated by the rib 112, the second bus bar 320 and the leg 420. The drawings show 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.

[0108] The heat transfer material 500 applied to the second bus bar 320 may have an upper surface above the upper surface of the extension 421. Therefore, the extension 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 through the extension 421 via the heat transfer material 500.

[0109] The heat transfer material 500 may have one end (eg, inner end) above the second protrusion 321 in the length direction (eg, X-axis direction) of the battery pack 10. The heat transfer material 500 may have one end below the leg 420 in the length direction (eg, X-axis direction) of the battery pack 10.

[0110] Fig.12 Only the left end of the heat transfer material 500 corresponding to the second bus bar 320 is shown with respect to the drawing. However, the right end of the heat transfer material 500 may be additionally supported by the wall of the upper case 110.

[0111] The heat transfer material 500 may correspond to the third bus bar 330. That is, the heat transfer material 500 may be applied to the third bus bar 330. For example, a portion of the heat transfer material 500 may be accommodated in the third recess 332 of the third bus bar 330. 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). Fig.13 As shown in , the heat transfer material 500 can be applied to the area separated by the rib 112, the third bus bar 330 and the leg 420. The drawings show 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.

[0112] The heat transfer material 500 applied to the third bus bar 330 may have an upper surface above the upper surface of the extension 421. Therefore, the extension 421 may be surrounded by the heat transfer material 500 so that the heat generated by the third bus bar 330 may be smoothly transferred to the heat sink 400 through the extension 421 via the heat transfer material 500.

[0113] like Figures 11 to 13 , 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 may 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 may contact the connection portion 422 or cover at least a portion of the connection portion 422. Furthermore, 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 may contact the body 410 or cover at least a portion of the body 410.

[0114] The heat transfer material 500 applied to the second bus bar 320 may cover at least a portion of the outer 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 may cover at least a portion of the outer leg portion 420 of the heat sink 400 in the length direction of the battery pack 10.

[0115] Fig.14 According to an embodiment of the present disclosure, Figure 3 A cross-sectional view taken along line AA'.

[0116] About heat transfer material 500A, Fig.14 The embodiment shown in the embodiment may be different from the above-described embodiment. Specifically, the embodiment may further include a wall portion 600A extending upward from the first protrusion 311A, thereby dividing the heat transfer material 500A applied to the first bus bar 310A into two parts. The other parts and configurations are the same as those of the above-described embodiment. In the following, the wall portion 600A will be mainly described. Fig.14 The configuration not shown in FIG. 1 is the same as that of the above-described embodiment, and the reference numerals are the same as those in the above-described embodiment.

[0117] The heat transfer material 500A corresponding to the first bus bar 310A may be accommodated on the first protrusion 311A ​​of the first bus bar 310A and in the first recess 312A. The heat transfer material 500A may be supported by the rib 112A and cover the extension 421A of the leg 420A of the heat sink 400A. The heat transfer material 500A may not be in contact with the connection portion 422A. In other embodiments, the heat transfer material 500A may be in contact with the connection portion 422A or cover at least a portion of the connection portion 422A. The heat transfer material 500A may be in contact with the body 410A or cover at least a portion of the body 410A. The heat transfer material 500A corresponding to the first bus bar 310A may be applied to the area divided between the first bus bar 310A, the rib 112A and the two legs 420A.

[0118] The wall portion 600A may be formed above the first bus bar 310A. Fig.14As shown in , the wall portion 600A may be above the first protrusion 311A ​​of the first bus bar 310A and protrude to a certain height. The height of the wall portion 600A may 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 421A. The height of the wall portion 600A may be the same as, lower than, or higher than the upper surface of the main body 410A. A wall portion 600A may be provided for each first bus bar 310A, and the wall portion 600A separates the heat transfer material 500A into two parts relative to the first protrusion 311A ​​and supports the heat transfer material 500A. Therefore, the shape of the heat transfer material 500A may be more reliably maintained, so that the heat transfer material 500A may have a height higher than the height of the extension 421A. The heat transfer material 500A may be applied to the first recessed portion 312A where heat of the first bus bar 310A is concentratedly generated, thereby increasing heat dissipation efficiency with respect to the total amount of the heat transfer material 500A.

[0119] The battery pack according to the embodiment may include a heat sink and a heat transfer material to effectively dissipate heat generated in the battery cells and the bus bars to the outside of the battery pack.

[0120] It should be understood that the embodiments described herein should be considered in a descriptive sense only, and not for limiting purposes. The description of features or aspects within each embodiment should generally be considered to be applicable to other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the drawings, it will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present disclosure.

Claims

1. A battery pack, comprising: 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; as well as 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 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 connection 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 depression formed in the bus bar, 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, wherein: 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 housing accommodating the plurality of battery cells.

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 length direction, and the first bus bar includes a protrusion and a recessed portion adjacent to the protrusion, Wherein, the heat sink includes two heat sinks facing each other, and The heat transfer material is contained on the protruding portion and in the recessed portion, 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 recessed portion. 12 . The battery pack according to claim 10 , further comprising 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, a portion of the convex portion is 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 Wherein, the heat transfer material is contained on the protruding 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, comprising: a plurality of battery cells, each battery cell of the plurality of battery cells comprising a vent; a housing 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 depression; 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 contained 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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