Battery packs and devices containing them

Abstract

The present invention includes a battery pack and a device including the same. A battery pack according to one embodiment of the present invention includes at least one battery module, a pack case including a case cover covering the at least one battery module and a case tray coupled to an edge of the case cover, and a gasket disposed between the case cover and the case tray, the gasket including a gasket flat portion which is an area where the gasket extends without curvature, and a gasket corner portion which is an area where the gasket deforms to correspond to the shape of the pack case and is bent with a curvature.

Description

[Technical Field]

[0001] The present invention relates to a battery pack and a device including the same, and more particularly to a battery pack with improved waterproof and vibration-proof performance and a device including the same. [Cross-citation with related applications(s)] This application claims the benefit of priority based on Korean Patent Application No. 10-2021-0171755 dated December 3, 2021, and all contents disclosed in the documents of that Korean patent application are incorporated herein by reference. [Background technology]

[0002] Due to technological development and increasing demand for mobile devices, the demand for secondary batteries as an energy source is rapidly increasing. As a result, much research is being conducted on secondary batteries that can meet various requirements.

[0003] Secondary batteries are also attracting attention as a power source for electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (Plug-In HEVs), etc., which have been proposed as a solution to air pollution caused by existing gasoline and diesel vehicles that use fossil fuels.

[0004] As a result, electric vehicles (EVs) that can run solely on batteries and hybrid electric vehicles (HEVs) that use both batteries and existing engines have been developed, and some of these have been commercialized. Nickel-metal hydride secondary batteries are mainly used as secondary batteries to power EVs and HEVs, but recently, active research has been conducted into the use of lithium secondary batteries, which have high energy density, high discharge voltage, and stable output.

[0005] When such a secondary battery is used as a power source for a vehicle, the secondary battery is used in the form of a battery pack including a number of battery modules or battery module assemblies. Vehicle battery packs have rubber gaskets placed at the joints between cases to seal the battery pack. However, depending on the shape of the cases, unevenness may occur at the joints between the cases, which may result in assembly errors.

[0006] In order to reduce the occurrence of the above problems, there have been attempts to form a gasket that can improve waterproof and vibration-proof performance while conforming to the shape of the case. Summary of the Invention [Problem to be solved by the invention]

[0007] The problem to be solved by the present invention is to provide a battery pack with improved waterproofing and vibration-proofing properties, and a device including the same.

[0008] However, the problems to be solved by the embodiments of the present invention are not limited to the above problems, and can be variously expanded within the scope of the technical ideas included in the present invention. [Means for solving the problem]

[0009] A battery pack according to one embodiment of the present invention includes at least one battery module, a pack case including a case cover covering the at least one battery module, and a case tray coupled to an edge of the case cover, and a gasket disposed between the case cover and the case tray, wherein the gasket includes a gasket flat portion which is a region where the gasket extends without curvature, and a gasket corner portion which is a region where the gasket deforms to correspond to the shape of the pack case and is bent with curvature.

[0010] The pack case may include a first region where the case cover and the case tray are positioned parallel to each other, and a second region where the case cover and the case tray are bent with a curvature.

[0011] The gasket flat surface portion may be located in the first region, and the gasket corner portion may be located in the second region.

[0012] In the first region, the distance between the case cover and the case tray may be a first length, and in the second region, the distance between the case cover and the case tray may be a second length, and the first length may be longer than the second distance.

[0013] The second length may be 90% or less of the total length of the first length.

[0014] In the second region case cover The curvature of Case Tray The curvature of the

[0015] The curvature of the gasket in the second region is case cover or the curvature of Case Tray The curvature of the

[0016] The amount of compression of the gasket in the first region may be less than the amount of compression of the gasket in the second region.

[0017] The gasket may include a gasket band that forms the overall shape of the gasket, and fastening portions that are a plurality of holes formed at intervals in the gasket band.

[0018] The fastening portion may be provided in an area corresponding to cover fastening holes, which are a plurality of holes that penetrate the case cover, and tray fastening holes, which are a plurality of holes that penetrate the case tray, when the pack case and the gasket are coupled together.

[0019] The gasket may include an elastic bead formed on an outer circumferential surface of the gasket so as to protrude in a height direction.

[0020] The gasket may include a position guider provided between the fastening portions and protruding from the gasket band in a direction perpendicular to a length direction of the gasket band.

[0021] The gasket may include a guide bead provided on the gasket band and located close to the position guide.

[0022] The gap between the case cover and the case tray may include a step portion, which is a region where the gap is wider than other regions, and a reinforcing portion formed in a region of the gasket corresponding to the step portion and having a larger surface area than other regions of the gasket.

[0023] The reinforcing portion may have an uneven structure formed on the surface. [Effects of the Invention]

[0024] According to one embodiment of the present invention, the waterproof performance and vibration-proof performance of the battery pack can be improved by forming a gasket that partially corresponds to the shape of the pack case.

[0025] The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 is a perspective view of a battery pack according to an embodiment of the present invention. [Figure 2] FIG. 2 is an exploded perspective view of a battery pack according to an embodiment of the present invention. [Figure 3] FIG. 3 is a diagram showing a gasket according to an embodiment of the present invention. [Figure 4]FIG. 4 is a diagram showing B1 in FIG. [Figure 5] FIG. 5 is a diagram showing a region including a corner portion of a battery pack according to an embodiment of the present invention. [Figure 6] FIG. 6(a) is a diagram showing imaginary circles forming a planar portion of a battery pack according to one embodiment of the present invention, and FIG. 6(b) is a diagram showing imaginary circles forming a corner portion of a battery pack according to one embodiment of the present invention. [Figure 7] FIG. 7 is a diagram showing a bead provided on a gasket according to an embodiment of the present invention. [Figure 8] FIG. 8 is a diagram showing a bead provided in a fastening portion of a gasket according to an embodiment of the present invention. [Figure 9] FIG. 9 is a diagram showing a guide provided on a gasket according to an embodiment of the present invention. [Figure 10] FIG. 10 is a view showing a pack case according to an embodiment of the present invention being assembled. [Figure 11] FIG. 11 is an enlarged view of part B2 of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0027] DETAILED DESCRIPTION OF THE INVENTION The present invention may be embodied in various different forms and is not limited to the embodiments set forth herein.

[0028] In order to clearly describe the present invention, parts that are not relevant to the description will be omitted, and the same reference numerals will be used throughout the specification to refer to the same or similar components.

[0029] Furthermore, the size and thickness of each component shown in the drawings are arbitrarily shown for the convenience of explanation, and the present invention is not necessarily limited to those shown in the drawings. Thicknesses are exaggerated in the drawings to clearly show various layers and regions. In the drawings, the thicknesses of some layers and regions are exaggerated for the convenience of explanation.

[0030] Furthermore, when a layer, film, region, plate, or other part is said to be "on" or "above" another part, this includes not only the case where it is "directly above" the other part, but also the case where there is another part in between. Conversely, when a part is said to be "directly above" another part, it means that there is no other part in between. Furthermore, being "on" or "above" a reference part means being located above or below the reference part, and does not necessarily mean being located "on" or "above" in the opposite direction of gravity.

[0031] Furthermore, throughout the specification, when a part "comprises" a certain element, this does not mean that other elements are excluded, and that other elements may also be included, unless otherwise specified to the contrary.

[0032] Furthermore, throughout the specification, "on a plane" means when the subject part is viewed from above, and "on a cross section" means when the subject part is cut vertically and viewed from the side.

[0033] Fig. 1 is a perspective view of a battery pack according to an embodiment of the present invention, and Fig. 2 is an exploded perspective view of the battery pack according to an embodiment of the present invention.

[0034] 1 and 2, a battery pack 10 according to an embodiment of the present invention includes a pack case 100 including a case cover 110 that covers a plurality of battery modules 11 and a case tray 120 that houses the plurality of battery modules 11 and is coupled to the case cover 110, and a gasket 200 that is provided between the case cover 110 and the case tray 120 to prevent the intrusion of moisture and dust from the outside.

[0035] The battery module 11 may include a battery cell stack in which a plurality of battery cells are stacked in a predetermined direction, and a module frame. The module frame may include an upper frame and a lower frame, and the battery cell stack may be attached between the upper frame and the lower frame to form a battery module. However, the module frame is not limited to the above, and may also be a monoframe made of a metal plate with top, bottom, and both side surfaces integrated together.

[0036] Here, the battery cells are not particularly limited in type, and may be pouch-type secondary batteries or prismatic secondary batteries, but are preferably pouch-type secondary batteries.

[0037] The case cover 110 may have an inverted U shape so as to cover the top and both side surfaces of the battery module 11, but is not limited to this.

[0038] The case cover 110 may be provided with a cover fastening hole 115. A plurality of cover fastening holes 115 may be provided. The cover fastening holes 115 may be holes spaced apart along the edge of the case cover 110. The cover fastening hole 115 may be a portion that penetrates the case cover 110. A fastening member 117 may penetrate and be fastened to the cover fastening hole 115.

[0039] The case tray 120 may have a U-shape that covers the bottom surface and the front and rear surfaces of the battery module 11, but is not limited to this.

[0040] The case tray 120 may be provided with tray fastening holes 125. A plurality of tray fastening holes 125 may be provided. The tray fastening holes 125 may be holes spaced apart along the edge of the case tray 120. The tray fastening holes 125 may be a portion that penetrates the case tray 120. A fastening member 117 may penetrate and be fastened to the tray fastening holes 125.

[0041] The case cover 110 and the case tray 120 may be coupled together with their edges aligned. In this case, the cover fastening holes 115 and the tray fastening holes 125 may be provided at corresponding positions, and fastening members 117 may pass through the cover fastening holes 115 and the tray fastening holes 125 to fasten them together. That is, the case cover 110 and the case tray 120 may be coupled together with the fastening members 117 that pass through the cover fastening holes 115 and the tray fastening holes 125 to fasten them together, thereby packaging the battery module 11. The coupling of the case cover 110 and the case tray 120 with the fastening members 117 is performed at the edges of the case cover 110 and the case tray 120. The fastening members 117 may be bolts and nuts, etc.

[0042] Case cover 110 and case tray 120 may be made of a rigid material.

[0043] Therefore, the plurality of battery modules 11 and the electrical equipment connected thereto can be protected from external physical shocks.

[0044] The gasket 200 is a component located between the case cover 110 and the case tray 120, and when the case cover 110 and the case tray 120 are joined together, it improves sealing performance and prevents moisture, foreign matter, etc. from penetrating into the battery module 11 side.

[0045] The gasket 200 may be provided along the area where the edges of the case cover 110 and the case tray 120 mate with each other. Therefore, the gasket 200 can correspond to the edge shape of the case cover 110 and also to the edge shape of the case tray 120.

[0046] The gasket 200 according to one embodiment of the present invention will be described in more detail below.

[0047] Fig. 3 is a view showing a gasket according to an embodiment of the present invention, and Fig. 4 is a view showing B1 of Fig. 3.

[0048] 3 and 4, a gasket 200 according to one embodiment of the present invention may include a gasket band 201 and a fastener 205.

[0049] The gasket band 201 can form the overall shape of the gasket 200. The gasket band 201 may be formed to correspond to the edge shapes of the case cover 110 and the case tray 120. The gasket band 201 may have a predetermined length and may be made of an elastic material such as rubber.

[0050] The fastening portion 205 may be a plurality of holes provided in the gasket 200. The fastening portion 205 may be a plurality of holes formed at intervals in the gasket band 201. The fastening portion 205 may be a portion that penetrates the gasket band 201. A fastening member may penetrate and be fastened to the fastening portion 205.

[0051] The fastening portions 205 may be provided in areas corresponding to the cover fastening holes 115 and the tray fastening holes 125 when the pack case 100 and the gasket 200 are coupled together. Therefore, the fastening members can simultaneously pass through the cover fastening holes 115, the gasket 200, and the tray fastening holes 125 to fasten the pack case 100 and the gasket 200 together, thereby improving the durability of the battery pack 10.

[0052] The gasket 200 may be made of an elastic material. For example, the gasket 200 may be made of rubber. Therefore, when pressure is applied to the gasket 200, the shape of the gasket 200 can change in response to the applied pressure. That is, the gasket 200 according to an embodiment of the present invention is case cover 110 and Case Tray120, pressure is transmitted between the gasket 200 and the gasket 200, and the gasket 200 can change into a three-dimensional shape. In this case, the gasket 200 may include a gasket flat portion 210 and a gasket corner portion 230.

[0053] The gasket flat portion 210 may be an area where the gasket 200 extends in a plane. The gasket flat portion 210 may be an area where the gasket 200 extends without curvature.

[0054] The gasket corner portion 230 may be a region where the gasket 200 is bent. The gasket corner portion 230 may be a region where the gasket 200 is bent with a curvature. The gasket corner portion 230 may be a region where the gasket 200 is bent to conform to the shape of the case cover 110. The gasket corner portion 230 may be a region where the gasket 200 is bent to conform to the shape of the case tray 120.

[0055] When pressure is applied to the gasket 200, the shape of the gasket 200 is deformed, and the gap formed between the case cover 110 and the case tray 120 can be filled, thereby preventing moisture, dust, etc. from entering the battery pack from the outside.

[0056] Fig. 5 is a diagram showing a region including a corner portion of a battery pack according to an embodiment of the present invention. Fig. 6(a) is a diagram showing an imaginary circle forming a flat portion of a battery pack according to an embodiment of the present invention, and Fig. 6(b) is a diagram showing an imaginary circle forming a corner portion of a battery pack according to an embodiment of the present invention.

[0057] Referring to FIG. 5, in the battery pack according to the embodiment of the present invention, there is a gasket space 130 between the case cover 110 and the case tray 120, in which a gasket 200 can be provided.

[0058] Specifically, the first region A1 in FIG. 5 may be a region where the case cover 110 and the case tray 120 are spaced apart from each other without any curvature. That is, the first region A1 may be a region where the case cover 110 and the case tray 120 are parallel to each other. The first region A1 may be a region where a gasket flat surface is located. The gasket 200 may be located in the gasket space 130 of the first region A1. The gasket flat surface may be located in the gasket space 130 of the first region A1. The distance between the case cover 110 and the case tray 120 in the first region A1 may be a first distance d1. In this case, the height of the gasket 200 located in the gasket space 130 of the first region A1 may be compressed to a height equivalent to or smaller than the first distance d1.

[0059] The second region A2 in FIG. 5 may be a region where the case cover 110 and the case tray 120 are bent with a curvature. The gasket 200 may be located in the gasket space 130 in the second region A2. The gasket space 130 in the second region A2 may be located with a gasket corner portion where the gasket 200 is deformed to correspond to the shapes of the case cover 110 and the case tray 120. In other words, the second region A2 may be a region where the gasket corner portion is located. In the second region A2, the distance between the case cover 110 and the case tray 120 may be a second length d2. In this case, the height of the gasket 200 located in the gasket space 130 in the second region A2 may be compressed to a height equivalent to or smaller than the second length d2.

[0060] In this case, the first distance d1 and the second length d2 may be different from each other. The first distance d1 and the second length d2 may not be constant. Specifically, the second length d2 may be shorter than the first distance d1. For example, the second length d2 may be 90% or less of the total length of the first distance d1. In this case, the compression amount of the gasket 200 may be greater in the second region A2 than in the first region A1.

[0061] Also, in the second area A2, case cover than 110 curvature Case Tray In this case, the curvature of the gasket 200 provided in the second region A2 is case cover equivalent to a curvature of 110, or Case Tray In this case, when the gasket 200 is provided between the case cover 110 and the case tray 120, the degree of compression of the gasket 200 in the first region A1 may be smaller than the curvature of the gasket 200 in the second region A2. In this case, when the gasket 200 is provided between the case cover 110 and the case tray 120, the degree of compression of the gasket 200 in the first region A1 may be smaller than the degree of compression of the gasket 200 in the second region A2. This increases the compression of the gasket 200 relative to the folded region of the pack case 100, further ensuring the airtightness of the battery pack and improving the waterproof and vibration-proof performance of the battery pack.

[0062] Referring to Figure 6, two circles are shown. Specifically, referring to Figure 6(a), a first circle C1 and a second circle C2 are shown, and referring to Figure 6(b), a third circle C3 and a fourth circle C4 are shown.

[0063] The first circle C1 and the third circle C3 may be virtual circles formed with the same radius based on a single center, and including an area of ​​the inner surface of the case cover 110 located adjacent to the edge of the case tray 120 as one point constituting the first circle C1 and the third circle C3.

[0064] The second circle C2 may be a circle that schematically shows the edge area of ​​the case tray 120 in the first area A1 in Fig. 5. In this case, the distance between the first circle C1 and the second circle C2 is length It may also be d1.

[0065] The fourth circle C4 may be a circle that schematically shows the edge area of ​​the case tray 120 in the second area A2 in Fig. 5. In this case, the shortest distance between the third circle C3 and the fourth circle C4 is the second area A2. lengthIt may also be d2.

[0066] In summary, the distance between case cover 110 and case tray 120 in first region A1 and second region A2 is different, and preferably, the distance in second region A2 is shorter than the distance in first region A1. Therefore, because the compression amount of the gasket located in second region A2 is higher than that in first region A1, even in second region A2 of the pack case, which has curvature and changes shape, it is possible to maintain or even improve waterproof performance and vibration-proof performance, similar to that of first region A1, which has a fixed shape.

[0067] FIG. 7 is a diagram showing a bead provided on a gasket according to an embodiment of the present invention.

[0068] FIG. 8 is a diagram showing a bead provided in a fastening portion of a gasket according to an embodiment of the present invention.

[0069] 7 and 8, a gasket 200 according to one embodiment of the present invention may include a resilient bead 250. As shown in FIG.

[0070] The elastic bead 250 is intended to further improve the sealing performance of the gasket 200 and may be formed on the outer circumferential surface of the gasket 200. The elastic bead 250 may be formed in a shape that protrudes in the height direction from the outer circumferential surface of the gasket 200. The elastic bead 250 may be elastically deformed while being pressurized by the case cover 110 and the case tray 120 when the case cover 110 and the case tray 120 are combined.

[0071] The elastic bead 250 may include a band bead 251 and a fastening bead 255 .

[0072] A plurality of band beads 251 may be provided. The band beads 251 may be formed on the outer circumferential surface of the gasket band 201. The band beads 251 may be formed to extend along the length of the gasket band 201.

[0073] The band bead 251 may transmit pressure in the height direction by the case cover 110 and the case tray 120 when the case cover 110 and the case tray 120 are joined together. The band bead 251 may be a region that protrudes in the height direction of the gasket band 201 along the length direction of the gasket band 201. In this case, the band bead 251 may be deformed as it expands in the width direction of the gasket band 201.

[0074] A plurality of fastening beads 255 may be provided. The fastening beads 255 may be formed on the outer circumferential surface of the fastening portion 205. The fastening beads 255 may be formed to correspond to the shape of the fastening portion 205. The fastening beads 255 may be a region that protrudes in the height direction of the fastening portion 205.

[0075] When the case cover 110 and the case tray 120 are joined together, the fastening bead 255 may receive pressure in the height direction from the case cover 110 and the case tray 120. In this case, the fastening bead 255 may be deformed as it expands in the width direction of the fastening portion 205.

[0076] The band bead 251 and fastening bead 255 protruding in the height direction of the gasket 200 undergo elastic deformation after receiving pressure, which improves the watertightness of the battery pack and makes it difficult for moisture, dust, etc. to enter the battery pack from the outside.

[0077] FIG. 9 is a diagram showing a position guider provided on a gasket according to an embodiment of the present invention.

[0078] Referring to FIG. 9, the gasket 200 according to the embodiment of the present invention includes a position guider 500 and Guide bead 700 and may include.

[0079] At least one position guider 500 may be provided between the plurality of fastening portions 205 and may protrude from the gasket band 201 by a predetermined length in a direction perpendicular to the longitudinal direction of the gasket band 201 .

[0080] The at least one position guider 500 may have a protruding length at least equal to the protruding length of the plurality of fastening portions 205. At the same time, the at least one position guider 500 may protrude so as not to exceed the edge lines of the case cover 110 and the case tray 120.

[0081] The protruding length of the at least one position guider 500 may be a predetermined protruding length for positioning the gasket 200 at an appropriate position. The predetermined protruding length may be at least the same as the protruding length of the plurality of fastening portions 205, or may be a protruding length that is positioned close to the edge of the case cover 110 and the case tray 120 but does not exceed the edge of the case cover 110 and the case tray 120.

[0082] At least one position guider 500 may be disposed at a distance from the band bead 251 so as not to interfere with the band bead 251 .

[0083] A plurality of position guiders 500 may be provided.

[0084] At least one of the plurality of position guiders 500 may be provided between the plurality of fastening portions 205. The plurality of position guiders 500 may be arranged at predetermined distances from each other along the length direction of the gasket band 201.

[0085] When a manufacturer or the like places the gasket 200 between the case cover 110 and the case tray 120, the manufacturer or the like can easily visually check the positions of the position guiders 500 through the use of the position guiders 500 and quickly determine whether the gasket 200 is placed in the correct position.

[0086] The guide bead (gasket bead) 700 may be provided on the gasket band 201 at a position close to the position guider 500. The guide bead (gasket bead) 700 may be provided in a circular shape.

[0087] The guide bead (gasket bead) 700, together with the elastic bead 250, can further improve the sealing performance of the gasket 200. That is, the guide bead (gasket bead) 700, together with the elastic bead 250, can be elastically deformed while being pressurized by the case cover 110 and the case tray 120 when the case cover 110 and the case tray 120 are joined together.

[0088] FIG. 10 is a view showing a pack case according to an embodiment of the present invention being assembled.

[0089] FIG. 11 is an enlarged view of part B2 of FIG.

[0090] 10 and 11, a battery pack according to an embodiment of the present invention may include a step portion 114 formed in a portion of the edge where the case cover 110, the gasket 200, and the case tray 120 are sequentially arranged.

[0091] The stepped portion 114 may be an area where the gap between the case cover 110 and the case tray 120 is wider than other areas, depending on the shapes of the components inside the battery pack and the shapes of the cases constituting the internal battery modules, etc. The stepped portion 114 is weak in sealing that blocks the inflow of foreign matter from the outside, so reinforcement is required. To this end, in one embodiment of the present invention, a reinforcing portion 290 having a wider surface area than other areas may be formed in a region of the gasket 200 corresponding to the stepped portion 114.

[0092] 11, the reinforcing portion 290 may have a concave-convex structure on its surface. The concave-convex structure may be formed to increase the surface area of ​​the reinforcing portion 290. The concave-convex structure may have, for example, a lattice shape, but is not limited thereto, and may be any structure that can increase the surface area.

[0093] When the reinforcing portion 290 is provided at the stepped portion 114, the path through which foreign matter such as moisture can enter the battery pack from the outside is lengthened, thereby effectively blocking the inflow of foreign matter. Specifically, referring to Fig. 10, foreign matter can enter from the outside through the stepped portion 114, which is the gap between the case cover 110 and the case tray 120, and the reinforcing portion 290 is located at the stepped portion 114, thereby lengthening the path through which foreign matter can enter.

[0094] Meanwhile, in this drawing, the step portion 114 is shown as being located in any part of the pack case 100, but the step portion 114 may occur anywhere in the pack case 100. Therefore, a reinforcing portion 290 can be formed in the gasket 200 to prevent the sealing at the step portion 114 from becoming weak.

[0095] Fastening portions 205, which are holes penetrating the reinforcing portion 290, may be formed at both ends of the reinforcing portion 290. When the case cover 110, the case tray 120, and the gasket 200 are combined, the cover fastening holes of the case cover 110 and the tray fastening holes of the case tray 120 may be located corresponding to the positions of the fastening portions 205 of the reinforcing portion 290.

[0096] Fastening members 117 pass through and are fastened to fastening portions 205, allowing reinforcing portions 290 to be coupled to case cover 110 and case tray 120. That is, fastening members 117 pass through and are fastened to the cover fastening holes, fastening portions 205, and tray fastening holes simultaneously, so that gasket 200 can be reliably fixed by case cover 110 and case tray 120. Fastening members 117 may have a bolt and nut connection structure.

[0097] The battery pack described above can be applied to various devices, including transportation means such as electric bicycles, electric cars, and hybrid cars, but the present invention is not limited thereto and can be applied to various devices using battery modules and battery packs including the same, which also fall within the scope of the present invention.

[0098] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention. [Explanation of symbols]

[0099] 10: Battery pack 100: Pack case 110: Case cover (gasket cover) 120: Case tray (gasket tray) 130: Gasket space 200: Gasket 201: Gasket band 205: Fastening part 210: Gasket flat surface 230: Gasket corner part 250: Elastic bead 290: Reinforcement 500: Position Guider 700: Guide bead

Claims

1. at least one battery module; a case cover for covering the at least one battery module; a pack case including a case tray coupled to an edge of the case cover; a gasket disposed between the case cover and the case tray; Including, The gasket is a gasket flat surface portion, which is a region where the gasket extends without curvature; a gasket corner portion, which is a region of the gasket that is deformed to correspond to the shape of the pack case and bent with a curvature; Including, the pack case includes a first region where the case cover and the case tray are positioned parallel to each other, and a second region where the case cover and the case tray are bent with a curvature; In the first region, a distance between the case cover and the case tray is a first length; In the second region, a distance between the case cover and the case tray is a second length; The battery pack, wherein the first length is greater than the second length.

2. 2. The battery pack according to claim 1, wherein the gasket is made of an elastic material.

3. A battery pack as described in claim 1, wherein a gasket space in which the gasket is located is provided between the case cover and the case tray.

4. The gasket flat surface portion is located in the gasket space of the first region, The battery pack according to claim 3 , wherein the gasket corner portion is located in the gasket space of the second region.

5. The battery pack according to claim 1 , wherein the second length is 90% or less of the total length of the first length.

6. At least one battery module; a case cover for covering the at least one battery module; a pack case including a case tray coupled to an edge of the case cover; a gasket disposed between the case cover and the case tray; Including, The gasket is a gasket flat surface portion, which is a region where the gasket extends without curvature; a gasket corner portion, which is a region of the gasket that is deformed to correspond to the shape of the pack case and bent with a curvature; Including, the pack case includes a first region where the case cover and the case tray are positioned parallel to each other, and a second region where the case cover and the case tray are bent with a curvature; The curvature of the case cover in the second region is smaller than the curvature of the case tray.

7. The battery pack according to claim 6 , wherein the curvature of the gasket in the second region is equal to or smaller than the curvature of the case cover.

8. At least one battery module; a case cover for covering the at least one battery module; a pack case including a case tray coupled to an edge of the case cover; a gasket disposed between the case cover and the case tray; Including, The gasket is a gasket flat surface portion, which is a region where the gasket extends without curvature; a gasket corner portion, which is a region of the gasket that is deformed to correspond to the shape of the pack case and bent with a curvature; Including, the pack case includes a first region where the case cover and the case tray are positioned parallel to each other, and a second region where the case cover and the case tray are bent with a curvature; The battery pack, wherein the amount of compression of the gasket in the first region is smaller than the amount of compression of the gasket in the second region.

9. The gasket is a gasket band that forms the overall shape of the gasket; a plurality of holes formed at intervals in the gasket band; The battery pack of claim 1 , comprising:

10. 10. The battery pack of claim 9, wherein the fastening portions are provided in areas corresponding to cover fastening holes, which are a plurality of holes that penetrate the case cover, and tray fastening holes, which are a plurality of holes that penetrate the case tray, when the pack case and the gasket are coupled together.

11. The battery pack according to claim 9 , wherein the gasket includes an elastic bead formed on an outer circumferential surface of the gasket so as to protrude in a height direction.

12. The battery pack according to claim 9 , wherein the gasket includes a position guider provided between the fastening portions and protruding from the gasket band in a direction perpendicular to a length direction of the gasket band.

13. The battery pack according to claim 12 , wherein the gasket includes a guide bead provided on the gasket band and provided at a position close to the position guider.

14. At least one battery module; a case cover for covering the at least one battery module; a pack case including a case tray coupled to an edge of the case cover; a gasket disposed between the case cover and the case tray; Including, The gasket is a gasket flat surface portion, which is a region where the gasket extends without curvature; a gasket corner portion, which is a region of the gasket that is deformed to correspond to the shape of the pack case and bent with a curvature; Including, a step portion where the gap between the case cover and the case tray is wider than other portions; The gasket includes a reinforcing portion having a surface with an uneven structure formed in a region corresponding to the step portion.

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