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 the 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 electric 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 on the bottom of the vehicle to ensure the running stability of the vehicle, 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 accommodated in the battery pack.

[0006] However, when the reinforcing member is disposed in this manner, the space in which the secondary battery can be accommodated 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, heat is generated, which may result in the secondary battery catching fire or exploding. For this reason, a structure is required that can quickly exhaust 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 venting structure that vents gas generated in the secondary battery is separately provided in the battery pack.

[0008] However, the structure for venting the 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 a structure for reinforcing rigidity does not occupy a space that accommodates a 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 due to abnormal heat generation in a secondary battery and in which such an 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 having a simple structure that can suppress the occurrence of fires caused by abnormal heat generation in secondary batteries and radio waves from the fire, and that can further secure storage space for secondary batteries, and an automobile to which the same is applied.

[0015] The technical problem of the present invention is not limited to the above-mentioned object, and other objects and advantages of the present invention not mentioned can be understood from the following description and can be more clearly understood by the embodiments of the present invention. It is understood that the objects and advantages of the present invention can be realized by the means and combinations thereof as 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 a width direction of a rectangle, and the second direction may be a 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 a rectangle extends.

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

[0020] The battery pack may be a flat rectangular parallelepiped having 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 up-down 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 extending direction may be connected to the side pack frame.

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

[0030] The sidepack 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 beam can support the pouch unit 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] Any of the plurality of pouch units may be arranged so as to be in contact with one another in the second direction.

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

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

[0037] The 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 the rigidity.

[0039] A base vent hole may be provided in the area of ​​the base plate opposite the support beam.

[0040] A beam vent hole may be provided on an 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 be open-topped.

[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] A lateral inner 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 may 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 extending in a first direction in the side pack frame, i.e., on a short side member.

[0057] The frame cavity may be coupled 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 passage formed therein 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 passage is not arranged.

[0062] The cooling plate may have a corresponding vent hole at a location opposite 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 exhausted by the pack venting device through the base vent hole, the corresponding vent hole, the beam vent hole, the beam hollow portion, the end vent hole, the beam connecting hole, and the 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. Effect 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 sufficient 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 making it possible to reduce the weight of the battery pack while still ensuring a larger 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 greater 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 description of the drawings]

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

[0076] The above-mentioned objects, features and advantages will be described in detail below with reference to the accompanying drawings, so that a person having ordinary skill in the art to which the present invention pertains can easily implement the technical idea of ​​the present invention. In describing the present invention, if a detailed description of a known technology according to the present invention is deemed to obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to 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 the terms "first", "second", etc. 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 it is understood that a first component may also be a second component unless otherwise specified.

[0078] Throughout the specification, unless specifically stated to the contrary, each element may be singular or plural.

[0079] Hereinafter, when an arbitrary structure is arranged on the "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 on (or below) the component.

[0080] In addition, 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 there may be other components "intervening" between each component, or each component may be "coupled," "coupled," or "connected" via other components.

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

[0082] In addition, the singular expressions used in this specification include the plural expressions unless the context clearly indicates otherwise. In this specification, the terms "comprise" or "include" should not be interpreted as including all of the components or steps described in the specification, but should be interpreted as including some components or steps that may not be included, or may further include additional components or steps.

[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 ease 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 inner direction, and the direction toward the outside of the lower case is referred to as the outer 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. 1 to 6.

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

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

[0089] The side of lower case 10 corresponding to the width direction 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 side may correspond to the width direction of the vehicle in which the battery pack 3 is installed, and the extension direction of the long side 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 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, and the lower end of the edge frame 63 extends further downward than the lower end of the wall frame 61. As a result, the inner surface of the edge frame 63 is disposed further outward than the inner surface of the wall frame 61, and the bottom surface of the edge frame 63 is disposed further downward than the bottom surface of the wall frame 61. And the bottom surface of the wall frame 61 is disposed 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 partitions provided therein, thereby enabling the side pack frame 60 to ensure its rigidity 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 to each other. In this way, the base plate 20 and the wall frame 61 may be fixed to each other while restricting their positions. In the embodiment, it is illustrated that 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. As a result, the undercover 70 and the edge frame 63 may be fixed to each other while restricting their positions. In the embodiment, the bottom surface of the undercover 70 and the bottom surface of the edge frame 63 are illustrated as being flush with each other.

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

[0100] The side pack frame 60 can be coupled to the base plate 20 and the undercover 70 in a form surrounding 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 laminated 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 passage 31 through the inlet of the cooling flow passage 31, cools the secondary battery while flowing through the cooling flow passage 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 extending in the first direction. Thus, end vent holes 55 having an open form may be provided at both ends of the support beam 50.

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

[0107] Beam connecting holes 65 may be provided at corner portions of the bottom surface and the 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 portion 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 surface of the inner side portion 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 to communicate with each other through the mating 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 beam hollow portion 51 of the support beam 50 and the frame hollow portion 67 of the side pack frame 60 have a structure that allows them to be connected to each other, 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 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 at intervals 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 the corresponding vent holes 33 may be provided at positions outside the cooling flow passage 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 Fig. 1 and Fig. 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 at positions corresponding to the base vent holes 23 and the corresponding vent holes 33 on the upper surface of the support beam 50. 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 flat rectangular square 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.

[0117] The space in the lower case 10 in which the secondary battery pouch unit 90 is housed can be connected to the frame hollow portion 67 of the side pack frame 60 via, in order, 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 the end vent hole 55, and the beam connecting hole 65 of the side pack frame 60.

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

[0119] A plurality of pouch units 90 may be housed in a space defined 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, the resin 40 can be attached or applied to the upper surface of the base plate 20. The resin 40 may be provided at 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 at 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, the two base vent holes 23 adjacent to each other in the second direction can communicate with each other through 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 beam 50 supports the pouch unit 90 and reinforces the rigidity of the lower case 10. The support beam 50 also provides a path for discharging gas leaking from the pouch unit 90.

[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 such 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 the pouch units 90 adjacent to each other 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 makes it possible to house even more pouch units 90 in the lower case 10 of the battery pack 3.

[0125] The 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 constituting 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 capable of 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 becomes high.

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

[0128] Gas discharged from the pouch unit 90 through the vent hole 91 arranged at a position corresponding to the base vent hole 23 can be discharged to the outside through the base vent hole 23. Also, as described above, gas discharged through the vent hole 91 arranged at a position away from the base vent hole 23 moves through the space between the adjacent base vent holes 23 where the resin 40 is not covered, and can be discharged to the outside through the 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-mentioned invention, the low-height support beam is disposed under 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 making it possible to secure more storage space for the secondary battery and thus to further increase the electric 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 indicated by the claims below, not by the above detailed description. Furthermore, it should be understood that the meaning and scope of the claims below, as well as all modifications and variations conceivable from the equivalent concept, are included in the scope of the present invention.

[0134] As described above, the present invention has been described with reference to the illustrative drawings, but 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 ordinary skilled artisans within the scope of the technical concept of the present invention. Even if the effects of the configuration of the present invention are not explicitly described and explained while describing the embodiments of the present invention, 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 Sidepack Frame 61 Wall Frame 63 Edge Frame 65 Beam connection hole 67 Frame Hollow Section 70 Undercover 75 Bulkhead 80 Pack Venting Device 90 Pouch Unit (SPU; Scalable Pouch Unit) 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: Rectangular base plate; a rectangular undercover disposed below the base plate at a distance 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 provided between the base plate and the undercover and extending in a first direction; a wall frame attached to the side pack frame and extending above the base plate; and a plurality of pouch units accommodated in an upper space of the base plate, the space being surrounded by the wall frame; Including the battery pack.

2. No member reinforcing the rigidity of the lower case is interposed between two pouch units adjacent to each other in the first direction or the second direction. The battery pack according to claim 1 .

3. All of the pouch units in the plurality of pieces are arranged so as to be adjacent to each other in the second direction. The battery pack according to claim 1 .

4. The support beam is provided in a plurality of pieces, 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.

5. 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. A base vent hole is provided in an area of ​​the base plate facing the support beam, A beam vent hole is provided on an upper surface of the support beam facing the base vent hole, The base vent hole and the beam vent hole communicate with each other; 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.

8. The battery pack according to claim 7.

9. An end vent hole is provided at least at one end of the support beam in the extending direction, The beam hollow portion and the end vent hole communicate with each other.

9. 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.

10. The battery pack of 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 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 pouch unit are fixed to each other by a resin interposed between the base plate and the 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.

8. The battery pack according to claim 7.

14. A vent hole is provided at a position corresponding to the area where the resin is not applied on the bottom surface of the pouch unit, through which gas generated inside the pouch unit is released to the outside of the pouch unit.

14. The battery pack of claim 13.

15. A cooling plate having a cooling passage 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. A base vent hole is provided in an area of ​​the base plate where the cooling flow passage 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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