Battery pack and automobile equipped with same

Abstract

The present invention relates to a vehicle battery pack that accommodates a secondary battery, and a vehicle to which the battery pack is applied. The battery pack includes a rectangular base plate, a rectangular undercover that is disposed at a distance from a lower portion of the base plate so as to face the base plate, a side pack frame that is connected to an edge of the base plate and an edge of the undercover to form an edge of a lower case, and a support beam that is provided between the base plate and the undercover and extends in a first direction. The support beam includes a hollow tube whose end is connected to the side pack frame. A base vent hole is provided in a region of the base plate facing the support beam, and a beam vent hole is provided in a portion of the support beam facing the base vent hole. A hollow portion of the support beam is connected to a frame hollow portion of the side pack frame so as to lead to the frame hollow portion. The frame hollow portion is connected to a pack venting device.

Description

[Technical Field]

[0001] This application claims priority based on Korean Patent Application No. 10-2022-0011216, filed on January 26, 2022, and all contents disclosed in the documents of this Korean patent application are incorporated herein by reference.

[0002] The present invention relates to a vehicle battery pack that houses a secondary battery, and a vehicle to which the same is applied. [Background technology]

[0003] Electric vehicles that use electricity as a driving force are becoming widespread. Electric vehicles are equipped with secondary batteries that store electrical energy. The secondary batteries are connected in parallel and / or series and provided to the vehicle in the form of a battery pack so as to provide a voltage and current suitable for driving a motor to drive the vehicle.

[0004] Since the battery pack is quite heavy, it is generally mounted at the bottom of the vehicle to ensure the vehicle's running stability, and therefore the battery pack generally has a low rectangular parallelepiped shape.

[0005] In order to ensure the rigidity of a rectangular battery pack having a large area and a small height, a cross-beam type reinforcing member is usually installed between the secondary batteries housed in the battery pack.

[0006] However, if the reinforcing member is installed in this manner, the space available for accommodating the secondary battery is reduced by the space occupied by the reinforcing member.

[0007] On the other hand, if a secondary battery is subjected to an external impact or other reasons that cause a short circuit, it may generate heat, which may result in the secondary battery catching fire or exploding. Therefore, a structure is required that can quickly release gas generated when the secondary battery heats up to an abnormally high temperature to the outside to prevent the secondary battery from exploding. For this reason, a battery pack is provided with a separate venting structure that vents gas generated in the secondary battery.

[0008] However, the structure for venting gas also occupies the space for accommodating the secondary battery, thereby reducing the space available for accommodating the secondary battery.

[0009] Patent Documents 1, 2, 3 and 4 disclose in detail the structure of such conventional battery packs. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Korean Patent No. 2065099 [Patent Document 2] Korean Patent Publication No. 2021-0017273 [Patent Document 3] Korean Patent Publication No. 2018-0006150 [Patent Document 4] Korean Patent Publication No. 2021-0041950 Summary of the Invention [Problem to be solved by the invention]

[0011] The present invention has been devised to solve the above-mentioned problems, and provides a battery pack structure in which the structure for reinforcing rigidity does not occupy the space for accommodating the secondary battery, and a vehicle to which the same is applied.

[0012] The present invention provides a battery pack that can quickly exhaust gas generated by abnormal heat generation in a secondary battery, and in which the exhaust structure does not occupy the storage space of the secondary battery, and a vehicle to which the battery pack is applied.

[0013] The present invention provides a battery pack structure that has a simple structure, is capable of ensuring sufficient rigidity, and is capable of further ensuring storage space for a secondary battery, and a vehicle to which the same is applied.

[0014] The present invention provides a battery pack structure that has a simple structure that can suppress the occurrence of fires caused by abnormal heat generation in secondary batteries and radio waves from fires, and that can further secure storage space for secondary batteries, and a vehicle to which the same is applied.

[0015] The technical object of the present invention is not limited to the above-mentioned objects, and other unmentioned objects and advantages of the present invention can be understood from the following description and can be more clearly understood from the embodiments of the present invention. It is also understood that the objects and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims. [Means for solving the problem]

[0016] To achieve the above object, the present invention can be applied to a battery pack including a rectangular lower case extending in a first direction and a second direction intersecting the first direction.

[0017] The first direction may be the width direction of the rectangle, and the second direction may be the length direction of the rectangle.

[0018] The first direction may be a direction in which a short side of a rectangle extends, and the second direction may be a direction in which a long side of the rectangle extends.

[0019] The first direction may correspond to a width direction of the vehicle, and the second direction may correspond to a front-rear direction of the vehicle.

[0020] The battery pack may be a flat rectangular parallelepiped with a small height in the vertical direction.

[0021] The lower case may include a rectangular base plate, a rectangular undercover, and a side pack frame connected to edges of the base plate and the undercover.

[0022] The base plate and the undercover may be disposed facing each other in the vertical direction and spaced apart from each other.

[0023] The base plate may be disposed higher than the undercover.

[0024] The side pack frame may include a pair of members extending in a first direction and a pair of members extending in a second direction.

[0025] The pair of members extending in the first direction may be short-side members.

[0026] The pair of members extending in the second direction may be long side members.

[0027] A support beam extending in a first direction is provided between the base plate and the undercover.

[0028] Both ends of the support beam in the extension direction may be connected to the side pack frame.

[0029] The support beam may be connected to the pair of members extending in the second direction of the side pack frame.

[0030] The side pack frame may include a wall frame extending above the base plate.

[0031] The base plate may form a bottom, and a space surrounded by the wall frame may house a plurality of pouch units.

[0032] The support beams can support the pouch units and reinforce the rigidity of the lower case.

[0033] When a plurality of pouch units are housed in the lower case, a structure for reinforcing the lower case may not be interposed between adjacent pouch units in the first direction or the second direction, which allows even more pouch units to be housed in the battery pack.

[0034] All of the plurality of pouch units may be arranged so as to be in contact with each other in the second direction.

[0035] A plurality of the support beams may be provided.

[0036] The plurality of support beams may be spaced apart from one another in the second direction.

[0037] The plurality of support beams may be arranged in a mutually aligned configuration.

[0038] Both ends of the support beam in the extension direction are connected to the side pack frame to further reinforce its rigidity.

[0039] The base plate area facing the support beam may be provided with a base vent hole.

[0040] A beam vent hole may be formed on the upper surface of the support beam opposite the base vent hole.

[0041] The base vent hole and the beam vent hole may be in communication with each other.

[0042] The support beam may have a hollow beam cavity along its extending direction.

[0043] The support beam may have a rectangular cross section. The support beam may have an open top.

[0044]

number

[0045] The beam vent hole and the beam hollow portion may be in communication with each other.

[0046] An end vent hole may be provided at least on either end of the support beam in the extending direction.

[0047] The end vent holes may be provided at both ends of the support beam.

[0048] The beam hollow portion and the end vent hole may be in communication with each other.

[0049] A beam connection hole leading to the end vent hole may be provided at a portion where the side pack frame is connected to the support beam.

[0050] The side pack frame may have a frame hollow portion extending in the second direction.

[0051] The side pack frame may further include an edge frame extending laterally outward beyond the base plate and undercover.

[0052] The inner lateral end of the edge frame may be connected to a lower portion of the wall frame.

[0053] The frame hollow portion may be provided in the edge frame.

[0054] The frame hollow portion can communicate with the beam connecting hole.

[0055] The lower case may further include a pack venting device for discharging gas leaked from the pouch unit.

[0056] The pack venting device may be provided on a member of the side pack frame that extends in the first direction, i.e., a short side member.

[0057] The frame cavity may be connected to the pack venting device.

[0058] The base plate and the pouch unit may be fixed to each other by a resin interposed between the base plate and the pouch unit.

[0059] A cooling plate having a cooling flow path may be laminated on the bottom surface of the base plate.

[0060] The support beam may be disposed below the cooling plate.

[0061] The base vent hole of the base plate may be provided in an area where the cooling flow path is not arranged.

[0062] The cooling plate may have a corresponding vent hole at a location facing the base vent hole.

[0063] The base vent hole and the corresponding vent hole can communicate with each other.

[0064] The base plate and the pouch unit may be fixed to each other by a resin interposed between the base plate and the pouch unit.

[0065] The resin may be present in a region including a plurality of base vent holes arranged along the second direction, but may not be present in a region extending along the second direction.

[0066] A vent hole may be provided at a position on the bottom surface of the pouch unit corresponding to the area where the resin is not applied, allowing gas generated inside the pouch unit to be released to the outside of the pouch unit.

[0067] Gas leaking from the pouch unit can be discharged by the pack venting device through the base vent hole, corresponding vent hole, beam vent hole, beam hollow portion, end vent hole, beam connecting hole, and frame hollow portion in flow order.

[0068] The pouch unit may be a scalable pouch unit (SPU).

[0069] The present invention can provide a vehicle equipped with the above-described battery pack. [Effects of the Invention]

[0070] The battery pack according to the present invention can further secure a storage space for the secondary battery pouch unit, thereby further increasing the electric capacity of the battery pack.

[0071] The battery pack according to the present invention can ensure sufficient electric capacity and rigidity of the battery pack.

[0072] The battery pack according to the present invention uses the structure itself as a gas exhaust path to reinforce the rigidity of the lower case, thereby reducing the weight of the battery pack and further securing storage space for the pouch unit.

[0073] The battery pack according to the present invention can be made lighter and have a larger electric capacity, and therefore when mounted on a vehicle, the vehicle can travel a longer distance.

[0074] The above-mentioned effects and specific effects of the present invention will be described in conjunction with the following description of the preferred embodiment of the invention. [Brief explanation of the drawings]

[0075] [Figure 1] 1 is a front perspective view of a lower case applied to a battery pack according to the present invention; [Figure 2] FIG. 2 is a rear perspective view of the lower case of FIG. 1. [Figure 3] FIG. 2 is a bottom view of the lower case of FIG. 1. [Figure 4] FIG. 4 is a bottom view of FIG. 3 with the undercover removed. [Figure 5] FIG. 5 is a bottom view of FIG. 4 with the support beam removed. [Figure 6] 6 is a cross-sectional view of FIG. 1 and FIG. 2 . [Figure 7] FIG. 10 is a perspective view of a pouch unit housed in the lower case. [Figure 8] 8 is a view showing a process of accommodating the pouch unit of FIG. 7 into the lower case of FIG. 1. [Figure 9] 8 is a view showing a process of accommodating the pouch unit of FIG. 7 into the lower case of FIG. 1. [Figure 10] 2 is a view showing a state in which all pouch units are housed in the lower case of FIG. 1; [Figure 11] 11 is a cross-sectional view of FIG. 10 . [Figure 12] 1 is a perspective view of a vehicle to which a battery pack is applied; DETAILED DESCRIPTION OF THE INVENTION

[0076] The above-mentioned objects, features, and advantages will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily implement the technical concept of the present invention. In describing the present invention, if a detailed description of known technologies relating to the present invention is deemed to obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings are used to indicate the same or similar components.

[0077] Although terms such as "first" and "second" are used to indicate various components, it is understood that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless otherwise specified, the first component may also be the second component.

[0078] Throughout the specification, unless otherwise specified, each element may be singular or plural.

[0079] Hereinafter, when an arbitrary structure is arranged "on top (or bottom)" of a component or "above (or below)" a component, it means that the arbitrary structure is not only arranged in contact with the upper surface (or lower surface) of the component, but also that other structures may be interposed between the component and the arbitrary structure arranged above (or below) the component.

[0080] Furthermore, when a component is described as being "coupled," "coupled," or "connected" to another component, it should be understood that the components may be directly coupled or connected to each other, but that other components may be "intervening" between the components, or that each component may be "coupled," "coupled," or "connected" via other components.

[0081] As used herein, singular expressions include plural expressions unless the context clearly dictates otherwise. Terms such as "comprise" or "include" in this application should not be interpreted as including all of the components or steps described in the specification, but should be interpreted as meaning that some components or steps may not be included, or that additional components or steps may be included.

[0082] Furthermore, as used herein, singular expressions include plural expressions unless the context clearly dictates otherwise. Terms such as "comprise" or "include" in this application should not be interpreted as including all of the components or steps described herein, but should be interpreted as meaning that some components or steps may not be included, or that additional components or steps may be included.

[0083] Throughout the specification, "A and / or B" means A, B or A and B unless otherwise specified, and "C to D" means C or more and D or less unless otherwise specified.

[0084] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0085] For convenience of explanation, on a plane including a first direction and a second direction described below, the direction toward the inside of the rectangular lower case is referred to as the inward direction, and the direction toward the outside of the lower case is referred to as the outward direction.

[0086] Hereinafter, an embodiment of a lower case 10 of a battery pack 3 that is applied to a vehicle 5 according to the present invention will be described with reference to FIGS.

[0087] The lower case 10 extends in the width direction (first direction) and the front-rear direction (second direction) and is applied to a battery pack 3 having a low height. That is, the battery pack 3 may be a flat, wide rectangular parallelepiped.

[0088] The lower case 10 has a rectangular plane extending in the width direction and in the front-rear direction intersecting the width direction, and has a predetermined height.

[0089] The side corresponding to the width direction of the lower case 10 may be a short side, and the side corresponding to the front-rear direction may be a long side.

[0090] The extension direction of the short sides may correspond to the width direction of the vehicle in which the battery pack 3 is installed, and the extension direction of the long sides may correspond to the front-rear direction of the vehicle, but the installation direction of the battery pack 3 according to the present invention is not limited thereto.

[0091] The lower case 10 includes a rectangular base plate 20 and a rectangular undercover 70 corresponding to the base plate 20 .

[0092] The undercover 70 may be in the form of a rectangular flat plate that is slightly larger than the base plate 20 .

[0093] The lower case 10 further includes a side pack frame 60 that is connected to the edges of the base plate 20 and the undercover 70 .

[0094] The side pack frame 60 has a generally L-shaped cross section. The side pack frame 60 can include a wall frame 61 connected to the base plate 20 and extending upward, and an edge frame 63 connected to the undercover 70 and extending laterally outward.

[0095] 6, the edge frame 63 may be connected to the lower outer surface of the wall frame 61 and extend further outward from the wall frame 61, with the lower end of the edge frame 63 extending further downward than the lower end of the wall frame 61. As a result, the inner surface of the edge frame 63 is positioned further outward than the inner surface of the wall frame 61, and the bottom surface of the edge frame 63 is positioned further lower than the bottom surface of the wall frame 61. The bottom surface of the wall frame 61 is positioned further inward than the bottom surface of the wall frame 61.

[0096] The wall frame 61 and the edge frame 63 may be hollow extruded members with predetermined partition walls provided inside, thereby ensuring the rigidity of the side pack frame 60 while minimizing its weight.

[0097] A step may be provided on the inside of the bottom surface of the wall frame 61, and the edge of the base plate 20 may be fitted into the step portion to fix them together. In this way, the base plate 20 and the wall frame 61 may be fixed while restricting their positions relative to each other. In the embodiment, an example is shown in which the bottom surface of the base plate 20 and the bottom surface of the wall frame 61 form the same plane.

[0098] A step may be provided on the inside of the bottom surface of the edge frame 63, and the edge of the undercover 70 may be fitted into the step portion to fix them together. In this way, the undercover 70 and the edge frame 63 may be fixed while restricting their positions relative to each other. In the embodiment, an example is shown in which the bottom surface of the undercover 70 and the bottom surface of the edge frame 63 form the same plane.

[0099] As a result, the base plates 20 may be disposed above the undercover 70 and may be disposed facing each other and spaced apart in the vertical direction.

[0100] The side pack frame 60 can be connected to the base plate 20 and the undercover 70 so as to surround the four sides of these. The side pack frame 60 includes a pair of short side members extending in a first direction and a pair of long side members extending in a second direction.

[0101] Wall frame 61 extends above the upper surface of base plate 20. This provides a space defined by the inner surface of wall frame 61 and the upper surface of base plate 20, and multiple secondary battery pouch units 90 can be accommodated in the space.

[0102] 5, a cooling plate 30 is stacked on the bottom surface of the base plate 20. The cooling plate 30 has a portion that is in close contact with the bottom surface of the base plate 20 and a portion that is spaced apart from the base plate 20. The portion that is spaced apart from the base plate 20 and the corresponding portion of the bottom surface of the base plate 20 define a cooling flow path 31 through which a cooling fluid flows.

[0103] The cooling fluid for cooling the secondary battery is supplied to the cooling flow path 31 through the inlet of the cooling flow path 31, cools the secondary battery while flowing through the cooling flow path 31, and returns through the outlet.

[0104] The support beam 50 is installed between the cooling plate 30 and the undercover 70. The upper surface of the support beam 50 may be in contact with and face the cooling plate 30, and the lower surface may be in contact with and face the undercover 70.

[0105] The support beam 50 may be a substantially flat rectangular tube extending in the first direction. That is, the support beam 50 may be a tubular member having a hollow beam portion 51 therein and extending in the first direction. As a result, open end vent holes 55 may be provided at both ends of the support beam 50.

[0106] Both end portions of the support beam 50 in the first direction are connected and fixed to the side pack frame 60. Specifically, the end portions of the support beam 50 are fixed to corner portions of the bottom surface and inner surface of the edge frame 63.

[0107] Beam connecting holes 65 may be provided at corners of the bottom surface and inner surface of the edge frame 63. The beam connecting holes 65 may be formed by removing a part of the inner side of the bottom surface of the edge frame 63 and a part of the lower end of the inner surface.

[0108] The lower part of the support beam 50 can contact the side of the bottom part of the edge frame 63 exposed by the beam connecting hole 65, and the upper part of the support beam 50 can contact the bottom part of the inner side part of the edge frame 63 exposed by the beam connecting hole 65.

[0109] In this way, the frame hollow portion 67 provided in the edge frame 63 of the side pack frame 60 and the beam hollow portion 51 of the support beam 50 are connected so as to communicate with each other through the mated beam connecting hole 65 and end vent hole 55.

[0110] The connection method between the support beam 50 and the side pack frame 60 is not necessarily limited to the form exemplified in the embodiment. For example, as described above, as long as the hollow beam portion 51 of the support beam 50 and the hollow frame portion 67 of the side pack frame 60 can be connected to communicate with each other, it goes without saying that they may be connected in other forms.

[0111] The support beam 50 may extend in a direction corresponding to the short sides of the lower case 10, and both ends thereof may be connected to a pair of side pack frames 60 provided on the long sides of the lower case 10. However, it goes without saying that, in addition to this, the support beam 50 may also extend in a direction corresponding to the long sides of the lower case 10 and be connected to a pair of side pack frames 60 provided on the short sides of the lower case 10.

[0112] 4, a plurality of support beams 50 may be arranged spaced apart along the second direction. Similarly, both ends of the plurality of support beams 50 may be connected to the side pack frame.

[0113] 1 and 5, the base plate 20 and the cooling plate 30 may have base vent holes 23 and corresponding vent holes 33 at corresponding positions, respectively. The base vent holes 23 and corresponding vent holes 33 may be provided at positions outside the cooling channels 31.

[0114] In the embodiment, a structure is illustrated in which a pair of base vent holes 23 and corresponding vent holes 33 are provided along the first direction and are arranged at equal intervals along the second direction. Referring to Figures 1 and 5, the plurality of base vent holes 23 and corresponding vent holes 33 are arranged in two rows along the second direction.

[0115] 4, one support beam 50 is disposed at a position passing through the lower portions of a pair of base vent holes 23 and corresponding vent holes 33 arranged in the first direction. Thus, a plurality of support beams 50 spaced apart at predetermined intervals along the second direction may be disposed below a pair of base vent holes 23 and corresponding vent holes 33 spaced apart at predetermined intervals along the second direction.

[0116] Beam vent holes 53 may be provided on the upper surface of the support beam 50 at positions corresponding to the base vent holes 23 and the corresponding vent holes 33. According to the embodiment, a pair of beam vent holes 53 is provided on the upper part of one support beam 50. That is, the support beam 50 of the embodiment is a flattened rectangular tube having a beam hollow portion 51 therein, end vent holes 55 are provided at both ends in the length direction, and a pair of beam vent holes 53 are provided on the upper surface thereof.

[0117] The space in the lower case 10 in which the secondary battery pouch unit 90 is accommodated can be connected to the frame hollow portion 67 of the side pack frame 60 via the base vent hole 23 of the base plate 20, the corresponding vent hole 33 of the cooling plate 30, the beam vent hole 53 of the support beam 50, the beam hollow portion 51 and end vent hole 55, and the beam connecting hole 65 of the side pack frame 60, in order.

[0118] The frame hollow portion 67 is formed to extend along the length of the side pack frame 60. The frame hollow portion 67 is connected to a pack venting device 80 provided in the side pack frame 60. In this embodiment, as shown in FIG. 2, a structure is exemplified in which the pack venting device 80 is installed on the outer surface of the wall frame 61 of the side pack frame 60, which is installed on the rear short side of the lower case 10.

[0119] A plurality of pouch units 90 may be housed in a space surrounded by the wall frame 61, with the base plate 20 forming the bottom.

[0120] In order to stably fix the pouch unit 90 on the base plate 20, a resin 40 can be attached or applied to the upper surface of the base plate 20. The resin 40 may be provided in a position other than the two rows of base vent holes 23 arranged along the second direction. The resin 40 does not have to be provided in the two rows passing through the base vent holes 23 in the second direction. Although the resin 40 is thin, it has a certain thickness. Therefore, even when the pouch unit 90 is placed on the resin 40, two base vent holes 23 adjacent in the second direction can communicate with each other via a small space provided on the upper part of the base plate 20 due to the portion where the resin 40 is not provided.

[0121] The support beams 50 support the pouch units 90 and reinforce the rigidity of the lower case 10. The support beams 50 also provide a path for gas leaking from the pouch units 90 to be discharged.

[0122] 7, the secondary battery pouch unit 90 may be in the shape of an elongated rectangular parallelepiped. The pouch unit 90 may be a scalable pouch unit.

[0123] 8 to 11, the pouch units 90 may be housed in the lower case 10 in a state where they are aligned so as to extend in the first direction. In this case, the pouch units 90 can be housed so that a plurality of the pouch units 90 are arranged along the second direction.

[0124] 10 , when the pouch units 90 are housed in the lower case 10, no structure for reinforcing the lower case is interposed between adjacent pouch units 90 in the second direction. That is, all of the multiple pouch units 90 can be arranged so as to be in contact with each other in the second direction. This allows even more pouch units 90 to be housed in the lower case 10 of the battery pack 3.

[0125] A plurality of pouch units 90 can be housed between the wall frame 61 provided at the rear and the partition wall 75 provided at the front. Other components that constitute the battery pack can be housed in the space between the partition wall 75 and the wall frame 61 provided at the front.

[0126] 11, a vent hole 91 for discharging gas is provided at the bottom of the pouch unit 90. The vent hole 91 is normally closed, and is configured to be thinner than other parts of the pouch unit 90 so that it opens first when the internal pressure of the pouch unit 90 increases.

[0127] Vent holes 91 may be arranged in an area on base plate 20 where resin 40 is not provided. Therefore, vent holes 91 of some pouch units 90 among the plurality of pouch units 90 may be arranged at positions corresponding to base vent holes 23, but vent holes 91 of some pouch units 90 may be arranged at positions outside of these.

[0128] Gas discharged from pouch unit 90 through vent holes 91 arranged at positions corresponding to base vent holes 23 can be discharged to the outside through the base vent holes 23. Furthermore, as described above, gas discharged through vent holes 91 arranged at positions away from base vent holes 23 moves through the space between adjacent base vent holes 23 that is not covered by resin 40, and can be discharged to the outside through a nearby base vent hole 23.

[0129] In this way, gas leaking from the pouch unit 90 can be discharged by the pack venting device 80 through the base vent hole 23, the corresponding vent hole 33, the beam vent hole 53, the beam hollow portion 51, the end vent hole 55, the beam connecting hole 65, and the frame hollow portion 67 in flow order.

[0130] Referring to FIG. 12, the battery pack 3 including the lower case 10 can be mounted under the vehicle 5 .

[0131] According to the above-described invention, the low-height support beam is disposed below the storage space for the secondary battery in the lower case to reinforce the rigidity of the lower case and provide a venting path for leaked gas, so that the structure for reinforcing the rigidity and the gas exhaust structure do not occupy the space for storing the secondary battery, thereby securing more storage space for the secondary battery and further increasing the electrical capacity of the battery pack.

[0132] Therefore, when the above-described battery pack is mounted on a vehicle, the distance that the vehicle can travel can be further increased.

[0133] It should be understood that the above-described embodiments are illustrative in all respects and are not limiting, and the scope of the present invention is defined by the claims that follow, rather than by the above detailed description. All modifications and variations that fall within the meaning and scope of the claims that follow, as well as equivalent concepts, should be construed as being included within the scope of the present invention.

[0134] Although the present invention has been described above with reference to illustrative drawings, the present invention is not limited to the embodiments and drawings disclosed in this specification, and it is clear that various modifications can be made by those skilled in the art within the scope of the technical concept of the present invention. Furthermore, even if the effects of the configuration of the present invention are not explicitly described and explained while the embodiments of the present invention are described above, it is natural that the effects that can be predicted by the configuration should also be recognized. [Explanation of symbols]

[0135] 3 Battery pack 5 vehicles 10 Lower Case 20 base plate 23 Base vent hole 30 cooling plate 31 Cooling channel 33 compatible vent hole 40 Resin 50 support beam 51 Beam hollow section 53 Beam vent hole 55 End vent hole 60 Side Pack Frame 61 Wall Frame 63 Edge Frame 65 Beam connecting hole 67 Frame hollow section 70 Undercover 75 Bulkhead 80 Pack Venting Device 90 Scalable Pouch Unit (SPU) 91 Vent Hole

Claims

1. A battery pack including a rectangular lower case extending in a first direction and a second direction intersecting the first direction, The lower case comprises: a rectangular base plate with a base vent hole; a rectangular undercover disposed below the base plate at a distance from the base plate so as to face the base plate; a side pack frame connected to an edge of the base plate and an edge of the undercover to form an edge of the lower case; a support beam disposed between the base plate and the undercover, extending in a first direction, and having a beam vent hole communicating with the base vent hole; a wall frame attached to the side pack frame and extending above the base plate; and a plurality of secondary battery pouch units accommodated in an upper space above the base plate, the space being surrounded by the wall frame; Including the battery pack.

2. The plurality of secondary battery pouch units are housed in the lower case without any structure for reinforcing the lower case between two adjacent secondary battery pouch units. The battery pack according to claim 1 .

3. all of the plurality of secondary battery pouch units are arranged so as to be in contact with one another in the second direction; The battery pack according to claim 1 .

4. The support beam is provided in plurality, The plurality of support beams are spaced apart from one another in the second direction. The battery pack according to claim 1 .

5. The plurality of support beams are aligned with one another. The battery pack according to claim 4 .

6. Both ends of the support beam in the extension direction are connected to the side pack frame. The battery pack according to claim 1 .

7. The base vent hole is provided in an area of the base plate facing the support beam, The beam vent hole is provided on the upper surface of the support beam opposite the base vent hole. The battery pack according to claim 1 .

8. The support beam has a hollow beam hollow portion along its extending direction, The beam vent hole and the beam hollow portion communicate with each other. The battery pack according to claim 7.

9. An end vent hole is provided at at least one end of the support beam in the extension direction, The beam hollow portion and the end vent hole communicate with each other. The battery pack according to claim 8 .

10. A beam connection hole leading to the end vent hole is provided at a portion where the side pack frame is connected to the support beam. The battery pack according to claim 9.

11. the side pack frame includes a frame hollow portion extending in a second direction, The frame hollow portion communicates with the beam connecting hole. The battery pack of claim 10.

12. the lower case further includes a pack venting device for discharging gas leaked from the secondary battery pouch unit, The frame hollow portion is connected to the pack venting device; The battery pack of claim 11.

13. The base plate and the secondary battery pouch unit are fixed to each other by a resin interposed between the base plate and the secondary battery pouch unit, the resin is not interposed in a region extending along the second direction so as to include a plurality of base vent holes arranged along the second direction; The battery pack according to claim 7.

14. a vent hole is provided at a position on the bottom surface of the secondary battery pouch unit corresponding to the area where the resin is not applied, through which gas generated inside the secondary battery pouch unit is released to the outside of the secondary battery pouch unit; The battery pack of claim 13.

15. a cooling plate having a cooling flow path is laminated on the bottom surface of the base plate; The support beam is disposed below the cooling plate. The battery pack according to claim 1 .

16. The base vent hole is provided in an area of the base plate where the cooling flow path is not arranged.

16. The battery pack of claim 15.

17. a corresponding vent hole is provided in a portion of the cooling plate facing the base vent hole; The base vent hole and the corresponding vent hole communicate with each other; 17. The battery pack of claim 16.

18. A vehicle equipped with the battery pack according to any one of claims 1 to 17.

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