Battery case

Abstract

The present invention provides a battery case including a side frame; a longitudinal member disposed inside the side frame and extending in the longitudinal direction; a width member disposed inside the side frame and extending in the width direction, connected to cross the longitudinal member, and including a first lower width unit and a second lower width unit overlapping in the height direction; and a cooling panel disposed above the first lower width unit for cooling a battery module.

Description

[Technical Field]

[0001] The present invention relates to a battery case. [Background technology]

[0002] It should be apparent that the material described in this section is merely provided as background information for the present invention and may not constitute prior art.

[0003] 2. Description of the Related Art Battery electric vehicles (hereinafter referred to as "electric vehicles"), which use electric energy from a battery as a driving source, are being produced and sold in increasing numbers as a means of solving the environmental problems of existing internal combustion engine vehicles.

[0004] As sales of electric vehicles are expected to increase, there is a trend toward introducing platforms specifically for electric vehicles, which differ from the platform structures currently shared with internal combustion engine vehicles, etc. The primary purpose of introducing a dedicated platform is that a new structure is required to accommodate batteries with sufficient capacity to extend driving range.

[0005] To achieve this, it is necessary to secure space under the vehicle to accommodate a high-capacity battery, which reduces the space available to absorb collision energy. While a structure to reinforce the vehicle's underbody is necessary to absorb collision energy in a small space, the battery itself also requires a reinforcement structure that can protect it from external collision loads and prevent damage to the battery cells.

[0006] Reinforcement structures can be broadly divided into lengthwise members that protect against front and rear collision loads, and widthwise members that protect against widthwise collision loads. Generally, to effectively protect against collision loads, the relevant members must be well connected, and the lengthwise and widthwise members must generally be welded together.

[0007] The battery modules are assembled in compartments divided by the lengthwise and widthwise members and can be protected from external impacts. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Korean Registered Utility Model No. 20-0193173 Summary of the Invention [Problem to be solved by the invention]

[0009] One aspect of the present invention is to provide a battery case that can efficiently withstand a collision load.

[0010] According to one aspect, the present invention provides a battery case that can improve production efficiency by minimizing changes in parts and that can be easily resized. [Means for solving the problem]

[0011] As one aspect to achieve the above object, the present invention provides a battery case including: a side frame; a longitudinal member disposed inside the side frame and extending in the length direction; a width member disposed inside the side frame and extending in the width direction, connected to the longitudinal member so as to cross the longitudinal member, and including a first lower width unit and a second lower width unit arranged overlapping in the height direction; and a cooling panel disposed above the first lower width unit to cool a battery module.

[0012] In another aspect to achieve the above object, the present invention provides a battery case including: side frames; longitudinal members formed within the side frames and extending in a longitudinal direction; and width members formed within the side frames and extending in a width direction and connected to the longitudinal members so as to cross each other; the longitudinal members include a lower longitudinal unit disposed below; and an upper longitudinal unit including a plurality of first variable units having different heights, at least one of the plurality of first variable units being coupled to an upper side of the lower longitudinal unit.

[0013] The width direction members may connect adjacent length direction members or connect the length direction members and the side frames.

[0014] The width direction member is a first lower width direction unit and a second lower width direction unit that are arranged to overlap each other in the height direction; The battery case is The battery pack may further include a cooling panel disposed above the first lower widthwise unit to cool the battery module.

[0015] The first lower width direction unit is disposed below the cooling panel and has foam beads through which the cooling panel passes, and the second lower width direction unit is disposed above the cooling panel and can be coupled to the first lower width direction unit.

[0016] The first lower widthwise unit has a hat-shaped cross section with an open bottom, and a lower side of the first lower widthwise unit is coupled to a bottom plate to form a closed cross section together with the bottom plate.

[0017] The width direction members may further include an upper width direction unit coupled to an upper side of the second lower width direction unit and joined to the length direction member via a connecting bracket.

[0018] The longitudinal member may include a lower longitudinal unit having a hat-shaped cross section with an open bottom and a bottom connected to a bottom plate to form a closed cross section together with the bottom plate; and an upper longitudinal unit connected to an upper side of the lower longitudinal unit to form a closed cross section together.

[0019] The structure may further include a cross-sectional reinforcing member provided inside the lengthwise member, arranged at a connection point where the widthwise members are connected, and supporting the inner widthwise surfaces of the lengthwise members.

[0020] The cross-sectional reinforcing member may be configured as a reinforcing bulkhead provided inside the longitudinal member disposed between adjacent widthwise members spaced apart in the width direction, and providing support between the adjacent widthwise members.

[0021] The reinforcing bulkhead and the width direction member may have cross sections with shapes that correspond to each other at least partially.

[0022] The widthwise members may be connected to the lengthwise members via connecting brackets, and the cross-sectional reinforcing members may be tubular reinforcing sleeves provided inside the lengthwise members and positioned between adjacent connecting brackets spaced apart in the widthwise direction, providing support between the adjacent connecting brackets.

[0023] The cooling panels are arranged between adjacent longitudinal members spaced apart in the width direction or between adjacent longitudinal members spaced apart in the width direction. Materials and the side frame, a unit cooling panel may be disposed in each unit space formed between the side frame and the unit cooling panel.

[0024] The unit cooling panel may be formed of a single member provided across a plurality of widthwise members spaced apart from each other in the longitudinal direction inside the side frame.

[0025] The unit cooling panel may include a plurality of cooling module plates spaced apart along the length direction to cool the battery modules; and a connecting module plate connecting adjacent cooling module plates.

[0026] The cooling module plate is disposed between adjacent widthwise members spaced apart in the longitudinal direction to cool the battery modules, and the connecting module plate has a width smaller than that of the cooling module plate and can be disposed between a first lower widthwise unit of the widthwise member and a second lower widthwise unit of the widthwise member.

[0027] The width direction member may include a lower width direction unit disposed on the lower side; and an upper width direction unit including a plurality of second variable units having different heights, at least one of the plurality of second variable units being coupled to the upper side of the lower width direction unit.

[0028] The lower longitudinal unit has a hat-shaped cross section that is open at the bottom, and its lower side is connected to a bottom plate to form a closed cross section together with the bottom plate, and the upper longitudinal unit can form a closed cross section when the first variable unit selected from the plurality of first variable units is connected to the upper side of the lower longitudinal unit.

[0029] The width direction member may further include an upper width direction unit, which is coupled to the upper side of the second lower width direction unit and includes a plurality of second variable units having different heights, at least one of the plurality of second variable units being coupled to the upper side of the lower width direction unit, and the upper width direction unit may be joined to the length direction member via a connecting bracket. [Effects of the Invention]

[0030] According to one embodiment of the present invention, it is possible to efficiently cope with a collision load.

[0031] According to an embodiment of the present invention, it is possible to improve production efficiency by minimizing changes in battery case components, and to easily change the size of the battery case. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is a perspective view of a battery case according to an embodiment of the present invention; [Figure 2] 10 is a view showing a width direction member to which a plurality of width direction units are connected in a height direction and a cooling panel; [Figure 3] FIG. 3 is a cross-sectional view taken along line II' in FIG. 2. [Figure 4] FIG. 3 is a cross-sectional view taken along line II-II' in FIG. 2. [Figure 5] 10 is a view showing a state in which a cooling panel is installed on the upper side of a first lower width direction unit. [Figure 6] 10 is a view showing details of a portion where a width direction member is connected to a length direction member; [Figure 7] 1 is a view showing an embodiment of a battery case provided with a cross-section reinforcing member according to the present invention; [Figure 8] 10 is a view showing another embodiment of a battery case provided with a cross-section reinforcing member according to the present invention; [Figure 9] 10 is a view showing another embodiment of a battery case provided with a cross-section reinforcing member according to the present invention; [Figure 10] 1 is a view showing a cooling plate of a comparative example battery case to be compared with the battery case of the present invention; [Figure 11] 11 is a view showing a cooling panel of a battery case according to an embodiment of the present invention, which is compared with the comparative example of FIG. 10. [Figure 12] FIG. 11 shows a state in which an upper width direction unit is additionally installed. [Figure 13] 13 is a view showing a state in which a battery module is installed between the length direction member and the width direction member of FIG. 12. [Figure 14]FIG. 10 is a perspective view of a battery case according to another embodiment of the present invention. [Figure 15] FIG. 2 is a plan view of the small battery case and the large battery case. [Figure 16] 10 is a cross-sectional view showing a longitudinal member including an upper longitudinal unit in which a plurality of first variable units are alternated; FIG. [Figure 17] 4 is a diagram showing an example in which FIG. 3 is applied. [Figure 18] 10 is a cross-sectional view showing a width direction member including an upper width direction unit in which a plurality of second variable units are replaced. FIG. [Figure 19] 18 is a diagram showing an example to which the present invention is applied. [Figure 20] 1 is a view showing an embodiment of a battery case provided with a cross-section reinforcing member according to the present invention; [Figure 21] 10 is a view showing another embodiment of a battery case provided with a cross-section reinforcing member according to the present invention; [Figure 22] 10 is a view showing another embodiment of a battery case provided with a cross-section reinforcing member according to the present invention; [Figure 23] 10 is a view showing a width direction member to which a plurality of width direction units are connected in a height direction and a cooling panel; [Figure 24] FIG. 24 is a cross-sectional view taken along line II' in FIG. 23. [Figure 25] 24 is a cross-sectional view taken along line II-II' in FIG. 23. [Figure 26] 10 is a view showing a state in which a cooling panel is installed on the upper side of a first lower width direction unit. [Figure 27] 10 is a view showing details of a portion where a width direction member is connected to a length direction member; [Figure 28] 1 is a view showing a cooling plate of a comparative example battery case to be compared with the battery case of the present invention; [Figure 29] 29 is a view showing a cooling panel of a battery case according to an embodiment of the present invention, which is compared with the comparative example of FIG. 28. [Figure 30]FIG. 29 shows a state in which an upper width direction unit is additionally provided. [Figure 31] 31 is a view showing a state in which a battery module is installed between the length direction member and the width direction member of FIG. 30. DETAILED DESCRIPTION OF THE INVENTION

[0033] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified into several other forms, and the scope of the present invention is not limited to the embodiments described below. Furthermore, the embodiments of the present invention are provided to more completely explain the present invention to those having average knowledge in the art. Therefore, the shapes and sizes of elements in the drawings may be enlarged or reduced (or highlighted or simplified) for clearer explanation.

[0034] With reference to the drawings, the battery case of the present invention is shown in width, height, and length directions, and the detailed description of the invention also uses the terms width, height, and length, but this is for convenience of explanation, and the technical features of the battery case of the present invention are not limited to these directions.

[0035] In the following, the X axis shown in the accompanying drawings is the length direction of the battery case, the Y axis is the width direction of the battery case, and the Z axis is the height direction of the battery case.

[0036] 1 to 14 are views showing a battery case according to one embodiment of the present invention, and FIGS. 15 to 31 are views showing a battery case according to another embodiment of the present invention.

[0037] Hereinafter, components included in a battery case according to an embodiment of the present invention will be described in detail with reference to FIGS.

[0038] FIG. 1 is a perspective view of a battery case according to an embodiment of the present invention, and FIG. 2 is a view showing a width direction member 300 to which a plurality of width direction units are coupled in a height direction and a cooling panel 400.

[0039] The battery case according to an embodiment of the present invention may include a side frame 100 , a lengthwise member 200 , a widthwise member 300 , and a cooling panel 400 .

[0040] The side frame 100 may be provided to surround the side surface. For example, the side frame 100 may be configured in a rectangular shape with an empty interior when viewed from above, and width direction members 300, length direction members 200, cooling panels 400, etc. may be arranged inside the side frame 100.

[0041] The longitudinal member 200 may be formed inside the side frame 100 to extend in the longitudinal direction, and may be installed across the interior of the side frame 100. The longitudinal member 200 may be formed to extend in the longitudinal direction, and a plurality of the longitudinal members 200 may be installed spaced apart in the width direction.

[0042] The longitudinal member 200 may be provided inside the side frame 100, extending in the longitudinal direction, and connected at both ends to the side frame 100. For example, the longitudinal member 200 may support the space between the front frame 110 and the rear frame 130 of the side frame 100, which are opposed to each other. For example, two longitudinal members 200 may be arranged spaced apart in the width direction inside the side frame 100.

[0043] The width direction member 300 is formed to extend widthwise inside the side frame 100, is connected to the length direction member 200 so as to cross, and may include a first lower width direction unit 301-1 and a second lower width direction unit 301-2 that are arranged overlapping in the height direction.

[0044] The width direction member 300 is provided inside the side frame 100 and extends in the width direction, and a plurality of width direction members 300 may be provided spaced apart in the length direction.

[0045] A plurality of widthwise units may be coupled in the height direction, and a cooling panel 400 may be provided between adjacent widthwise units coupled in the height direction to penetrate therethrough.

[0046] Each width direction unit may have components such as a second upper plate 310, a second side plate 330, and a second lower plate 350. Each of a first lower width direction unit 301-1, a second lower width direction unit 301-2, and an upper width direction unit 302, which will be described later, may have components such as a second upper plate 310, a second side plate 330, and a second lower plate 350.

[0047] The cooling panel 400 is installed between adjacent width-direction units coupled in the height direction, and can cool the battery module C.

[0048] The widthwise members 300 can connect between adjacent lengthwise members 200 or between a lengthwise member 200 and a side frame 100 .

[0049] The widthwise members 300 may provide support between adjacent lengthwise members 200 or between the lengthwise members 200 and the side frames 150 of the side frames 100 .

[0050] Figure 3 is a cross-sectional view along line II' in Figure 2, Figure 4 is a cross-sectional view along line II-II' in Figure 2, and Figure 5 is a view showing the state in which a cooling panel 400 is installed on the upper side of the first lower width direction unit 301-1.

[0051] The width direction member 300 may include a first lower width direction unit 301-1 and a second lower width direction unit 301-2.

[0052] The first lower widthwise unit 301-1 is disposed below the cooling panel 400 and may have a foam bead 370 through which the cooling panel 400 passes.

[0053] The first lower widthwise unit 301-1 may have a lower side coupled to the bottom plate 600, and the cooling panel 400 may be disposed on the foam beads 370 formed on the upper side.

[0054] The first lower widthwise unit 301-1 may include a second upper plate 310, a pair of second side plates 330, and a pair of second lower plates 350. For example, the second lower plate 350 may be joined to the bottom plate 600 by welding. In the first lower widthwise unit 301-1, the second upper plate 310, the pair of second side plates 330, and the pair of second lower plates 350 may form a hat-shaped cross section.

[0055] The second lower width direction unit 301-2 is disposed above the cooling panel 400 and may be combined with the first lower width direction unit 301-1.

[0056] Referring to FIG. 3, in the portion where the cooling panel 400 is not disposed, the second lower width direction unit 301-2 and the first lower width direction unit 301-1 may be coupled by a method such as bolt joining.

[0057] Referring to FIG. 4, the second lower width direction unit 301-2 is disposed above the first lower width direction unit 301-1 with the cooling panel 400 interposed therebetween, and the first lower width direction unit 301-1, the cooling panel 400, and the second lower width direction unit 301-2 can be connected by bolt joints or the like.

[0058] The second lower widthwise unit 301-2 may include a second upper plate 310, a pair of second side plates 330, and a pair of second lower plates 350. For example, the second lower plate 350 may be connected to the second upper plate 310 of the first lower widthwise unit 301-1 by a method such as bolting. In the second lower widthwise unit 301-2, the second upper plate 310, the pair of second side plates 330, and the pair of second lower plates 350 may form a hat-shaped cross section.

[0059] The first lower widthwise unit 301-1 has a hat-shaped cross section with an open bottom, and is connected to the bottom plate 600 at the bottom to form a closed cross section together with the bottom plate 600, and may have foam beads 370 on the upper side through which the cooling panel 400 passes.

[0060] FIG. 6 is a detailed view of the portion where the width direction member 300 is connected to the length direction member 200. As shown in FIG.

[0061] The width direction member 300 may further include an upper width direction unit 302. The upper width direction unit 302 may be coupled to the upper side of the second lower width direction unit 301-2 and may be joined to the length direction member 200 via a connecting bracket B.

[0062] The upper width direction unit 302 is coupled to the upper side of the second lower width direction unit 301-2, and although not shown, depending on the size of the battery case, multiple upper width direction units 302 may be stacked and coupled in the height direction to the upper side of the second lower width direction unit 301-2.

[0063] The upper width direction unit 302 may include a second upper plate 310, a pair of second side plates 330, and a pair of second lower plates 350. The upper width direction unit 302 may have a rectangular cross section formed by the second upper plate 310, the pair of second side plates 330, and the pair of second lower plates 350.

[0064] For example, the second lower plate 350 may be coupled to the second upper plate 310 of the second lower widthwise unit 301-2 by welding or the like.

[0065] FIG. 7 is a view showing an embodiment of a battery case provided with a cross-section reinforcing member 500 of the present invention, and FIG. 8 is a view showing another embodiment of a battery case provided with a cross-section reinforcing member 500 of the present invention.

[0066] The longitudinal member 200 may include a lower longitudinal unit 201 and an upper longitudinal unit 202 .

[0067] The upper longitudinal unit can be coupled to the upper side of the lower longitudinal unit 201 and form a closed cross section.

[0068] The lower longitudinal unit 201 has a hat-shaped cross section with an open bottom, and the lower side is coupled to the bottom plate 600 to form a closed cross section together with the bottom plate 600 .

[0069] The upper longitudinal unit 202 is configured as a "C-shaped" member with an open bottom, and the open part can be fitted into the upper side of the lower longitudinal unit 201. In this case, an inset step 270 into which the lower part of the upper longitudinal unit 202 fits can be formed on the upper side of the lower longitudinal unit 201. As an example, the lower end of the upper longitudinal unit 202 can be placed on the inset step 270 of the lower longitudinal unit 201, and the upper longitudinal unit 202 and the lower longitudinal unit 201 can be welded together.

[0070] Each of the longitudinal units may have components such as a first upper plate 210, a first side plate 230, and a first lower plate 250. Each of the upper longitudinal unit 202 and the lower longitudinal unit 201, which will be described later, may have components such as a first upper plate 210, a first side plate 230, and a first lower plate 250.

[0071] The battery case may further include a cross-sectional reinforcing member 500 .

[0072] The cross-sectional reinforcing member 500 is provided inside the longitudinal member 200 and is arranged at the connection point where the widthwise member 300 is connected, and can support the inner surfaces of the longitudinal member 200 in the width direction.

[0073] The cross-sectional stiffening member 500 provides support between the two widthwise inner faces of the longitudinal member 200 .

[0074] The longitudinal member 200 is formed to extend in the length direction and may have a hollow portion formed therein. The longitudinal member 200 has an advantage in terms of weight reduction due to the hollow portion formed therein, but buckling may occur due to an impact load in the width direction, and the cross-sectional reinforcing member 500 can reinforce this.

[0075] The cross-sectional reinforcing member 500 can be configured as a reinforcing bulkhead 501 that is provided inside the longitudinal member 200 arranged between adjacent widthwise members 300 spaced apart in the width direction and provides support between the adjacent widthwise members 300.

[0076] The reinforcing bulkhead 501 serves to ensure the continuity of the cross section in the width direction between two widthwise members 300 spaced apart in the width direction. A lengthwise member 200 having a reinforcing bulkhead 501 provided therein may be disposed between two widthwise members 300 spaced apart in the width direction.

[0077] The reinforcing bulkhead 501 and the width directional member 300 may be disposed across the first side panel 230 of the length directional member 200. The reinforcing bulkhead 501 may be joined to the inner surface of the first side panel 230 of the length directional member 200, and the width directional member 300 may be joined to the inner surface of the first side panel 230 of the length directional member 200 at a position corresponding to the position where the reinforcing bulkhead 501 is joined. As an example, the reinforcing bulkhead 501 may be joined to the inner surface of the first side panel 230 of the length directional member 200 by welding.

[0078] The left width direction member 300, the first left side panel 230, the reinforcing bulkhead 501, the first right side panel 230, and the right width direction member 300 may be arranged in the width direction.

[0079] As an example, referring to FIG. 7, the reinforcing bulkhead 501 may be joined to the inner surface of the first side panel 230 of the upper longitudinal unit 202 of the longitudinal member 200, and the upper widthwise unit 302 of the widthwise member 300 may be joined to the inner surface of the first side panel 230 of the upper longitudinal unit 202 at a position corresponding to where the reinforcing bulkhead 501 is joined.

[0080] As another example, referring to FIG. 8, the reinforcing bulkhead 501 may be joined to the inner surface of the first side panel 230 of the lower longitudinal unit 201 of the longitudinal member 200, and the second lower widthwise unit 301-2 of the widthwise member 300 may be joined to the inner surface of the first side panel 230 of the lower longitudinal unit 201 at a position corresponding to where the reinforcing bulkhead 501 is joined.

[0081] The reinforcing bulkhead 501 and the width direction member 300 may have cross sections of corresponding shapes to each other. The reinforcing bulkhead 501 and the width direction member 300 may be disposed at corresponding positions across the first side panel 230 of the length direction member 200.

[0082] As an example, if the transverse member 300 has a U-shaped cross section, the reinforcing bulkhead 501 may have a corresponding U-shaped cross section.

[0083] As an example, if the width direction member 300 includes a second upper plate 310 and a pair of second side plates 330, and includes a "U-shaped" cross section with an open bottom, the reinforcing bulkhead 501 may have a corresponding "U-shaped" cross section.

[0084] The "U-shaped" cross-sectional portion of the width direction member 300 and the "U-shaped" cross-sectional portion of the reinforcing bulkhead 501 can be disposed at corresponding positions across the first side panel 230 of the length direction member 200. This allows the continuity of the cross sections of the left width direction member 300, the left first side panel 230, the reinforcing bulkhead 501, the right first side panel 230, and the right width direction member 300 to be maintained, thereby enabling stable resistance to widthwise impact loads.

[0085] The reinforcing bulkhead 501 and the width direction member 300 may have cross sections with shapes that correspond to each other at least in part of the cross sections.

[0086] For example, if the width direction member 300 has a "U-shaped" cross section including a "U-shaped" cross section, the reinforcing bulkhead 501 may have a "U-shaped" cross section corresponding to the "U-shaped" cross section of the width direction member 300. The "U-shaped" cross section of the width direction member 300 and the "U-shaped" cross section of the reinforcing bulkhead 501 may be disposed at corresponding positions across the first side panel 230 of the length direction member 200.

[0087] FIG. 9 is a view showing another embodiment of the battery case according to the present invention, in which a cross-section reinforcing member 500 is provided.

[0088] The width direction member 300 may be connected to the length direction member 200 via the connecting bracket B. The cross-sectional reinforcing member 500 may be provided inside the length direction member 200 between adjacent connecting brackets B spaced apart in the width direction, and may be composed of a tubular reinforcing sleeve 502 that provides support between the adjacent connecting brackets B.

[0089] The reinforcing sleeve 502 serves to ensure the continuity of the cross section in the width direction between two connecting brackets B connected to the width direction member 300. The length direction member 200 having the reinforcing sleeve 502 installed therein can be disposed between two connecting brackets B spaced apart in the width direction.

[0090] The reinforcing sleeve 502 may support the longitudinal member 200 between two inner widthwise surfaces. In addition, the two connecting brackets B and the longitudinal member 200 may be fastened together using a reinforcing bolt member 503. Specifically, the reinforcing bolt member 503 may be fastened by passing through the left connecting bracket B, the longitudinal member 200, the reinforcing sleeve 502, and the right connecting bracket B.

[0091] The first bracket B1 of the connecting bracket B can be joined to the width direction member 300 by bolting or welding, and the second bracket B2 of the connecting bracket B can be fastened together with the length direction member 200 and the reinforcing sleeve 502 by a reinforcing bolt member 503.

[0092] FIG. 10 is a view showing a cooling plate D of a comparative battery case to be compared with the battery case of the present invention, and FIG. 11 is a view showing a cooling panel 400 of a battery case according to an embodiment of the present invention to be compared with the comparative example of FIG. 10.

[0093] FIG. 12 is a diagram showing a state in which an upper widthwise unit 302 is additionally installed in FIG. 11, and FIG. 13 is a diagram showing a state in which a battery module C is installed between the lengthwise member 200 and the widthwise member 300 in FIG. 12.

[0094] The cooling panels 400 are arranged between adjacent longitudinal members 200 spaced apart in the width direction or between adjacent longitudinal members 200 spaced apart in the width direction. Component 200 The unit cooling panels 400M may be disposed in the unit spaces formed between the side frames 100 and the cooling panels 400M.

[0095] The unit space is defined between two longitudinal members 200 spaced apart in the width direction or between two longitudinal members 200 spaced apart in the width direction. Component 200 and the side frame 100.

[0096] The front frame 110 of the side frame 100 may be disposed in front of the unit space, and the front frame 110 of the side frame 100 may be disposed in the rear of the unit space.

[0097] The sides of the unit space have two length directions Component 200 are arranged at intervals in the width direction, or on one side of the unit space, Component 200 is placed on the other side of the unit space in the longitudinal direction. Component 200 The side frame 150 may be disposed spaced apart from the center frame 130 in the width direction.

[0098] That is, the unit space is defined by the front frame 110, a pair of longitudinal Component 200 , surrounded by the rear frame 130, the front frame 110, Component 200 , and can be surrounded by side frames 150 and rear frame 130.

[0099] The unit cooling panel 400M may be installed in the length direction across the interior of the side frame 100. The unit cooling panel 400M may be disposed below the battery module C to cool the battery module C. A cooling line 450 may be connected to the unit cooling panel 400M to supply cool air. The unit cooling panel 400M may be installed individually in the unit space.

[0100] For example, two longitudinal members 200 may be disposed at a distance in the width direction inside the side frame 100, and three unit spaces may be disposed at a distance in the width direction. Three unit cooling panels 400M may be provided in the three unit spaces. That is, a unit cooling panel 400M formed integrally with the unit space may be provided, respectively.

[0101] The cooling panel 400 may be composed of three unit cooling panels 400M, and the three unit cooling panels 400M may be spaced apart in the width direction.

[0102] One unit cooling panel 400M is disposed between two longitudinal members 200 spaced apart in the width direction, and when one unit cooling panel 400M is disposed between the left side frame 100 in the width direction and the longitudinal member 200, Component 200 and the side frame 100 on the right side in the width direction, one unit cooling panel 400M is disposed between them, so that a total of three unit cooling panels 400M can be provided.

[0103] Although this specification illustrates and describes the arrangement as including three unit cooling panels 400M, this is not necessarily limited to this, and two or four or more unit cooling panels 400M may be formed.

[0104] If the cooling panel 400 is installed over the entire battery case so that the cooling water flows throughout the entire battery case, the cooling flow path becomes long, which increases the cooling temperature loss and reduces the cooling performance.

[0105] The cooling panel 400 has the effect of preventing the cooling flow path from becoming excessively long by individually installing the unit cooling panels 400M in the unit space, thereby improving cooling performance, and reducing the size of the unit cooling panels 400M, thereby reducing the springback phenomenon of the unit cooling panels 400M that may occur during molding of the unit cooling panels 400M, thereby facilitating molding and assembly of the unit cooling panels 400M.

[0106] The unit cooling panel 400M may be formed of a single member provided across the entire width direction members 300 arranged inside the side frame 100 at intervals in the length direction.

[0107] FIG. 10 is a view showing a cooling plate D of a comparative battery case to be compared with the battery case of the present invention, and FIG. 11 is a view showing a cooling panel 400 of a battery case according to an embodiment of the present invention to be compared with the comparative example of FIG. 10.

[0108] 10, the comparative example, unlike the embodiment of the present invention, requires separate cooling plates D and an additional tube structure E to connect the channels of the cooling plates D in each region. Also, in order to connect the tube structures E, it is necessary to secure a space for the channels to pass through at the upper end of the width direction member 300 or to secure the channels by drilling holes in the width direction member 300. Therefore, the comparative example has many structural problems in terms of maximizing battery capacity in a limited space and protecting it from external impacts.

[0109] Referring to FIG. 11, in the embodiment, like the comparative example, the unit cooling panel 400M is composed of a single member that is installed across the entirety of multiple widthwise members 300 that are spaced apart in the longitudinal direction inside the side frame 100. Therefore, unlike the comparative example, there is no need to install multiple cooling plates D divided into unit spaces, and no additional tube structure is required to connect the flow paths of the cooling plates D in each area, which has the effect of maximizing battery capacity while providing stable protection from external impacts.

[0110] The unit cooling panel 400M may include a cooling module plate 410 and a connecting module plate 430.

[0111] The cooling module plates 410 are provided in a plurality at intervals along the length direction to cool the battery modules C.

[0112] The connecting module plate 430 can connect two cooling module plates 410 together.

[0113] The cooling module plate 410 and the connecting module plate 430 can be integrally manufactured from a single metal plate such as steel.

[0114] The battery module C may be disposed between two adjacent width direction members 300 spaced apart in the length direction.

[0115] The cooling module plate 410 is disposed between two adjacent widthwise members 300 spaced apart in the longitudinal direction to cool the battery module C, and the connecting module plate 430 has a width smaller than that of the cooling module plate 410 and can be disposed between the first lower widthwise unit 301-1 of the widthwise member 300 and the second lower widthwise unit 301-2 of the widthwise member 300.

[0116] The connecting module plate 430 is provided with a width smaller than that of the cooling module plate 410, so that the transfer of cool air to the width direction member 300 can be minimized while connecting the two cooling module plates 410 together.

[0117] Furthermore, although the connecting module plate 430 is provided with a smaller width than the cooling module plate 410, since the connecting module plate 430 is provided between the first lower width direction unit 301-1 and the second lower width direction unit 301-2 which are connected in the height direction, the rigidity is reinforced by the first lower width direction unit 301-1 and the second lower width direction unit 301-2, and problems such as breakage of the connecting module plate 430 may not occur.

[0118] For example, the connecting module plate 430 may be disposed so as to be completely inserted between the first lower width direction unit 301-1 and the second lower width direction unit 301-2.

[0119] As another example, a portion of the connecting module plate 430 may be arranged between the first lower width direction unit 301-1 and the second lower width direction unit 301-2, and another portion of the connecting module plate 430 may be arranged away from the first lower width direction unit 301-1 and the second lower width direction unit 301-2.

[0120] For example, the cooling panel 400 may be provided across four width direction members 300 spaced apart in the length direction. The cooling panel 400 may be configured in a shape in which three cooling module plates 410 are connected, and a cooling module plate 410 may be disposed between two adjacent width direction members 300. However, the cooling panel 400 is not divided by the width direction members 300.

[0121] Hereinafter, components included in a battery case according to another embodiment of the present invention will be described in detail with reference to FIGS.

[0122] FIG. 14 is a perspective view of a battery case according to another embodiment of the present invention, and FIG. 15 is a plan view of the small battery case 1 and the large battery case 2. As shown in FIG.

[0123] FIG. 16 is a cross-sectional view showing a longitudinal member 1200 including an upper longitudinal unit 1202 in which a plurality of first variable units 1202U are replaced, and FIG. 17 is a drawing showing an example in which FIG. 16 is applied.

[0124] The small battery case 1 and the large battery case 2 can be changed in size in the length direction (X axis), width direction (Y axis), and height direction (Z axis) of the battery case to ensure the required battery capacity according to the changing size of the electric vehicle. Accordingly, the sizes of the length direction member 1200, width direction member 1300, etc., which are components included in the battery case of the present invention, can also be changed.

[0125] In this case, if the lengthwise and widthwise dimensions of the battery case need to be changed, this can be easily accommodated by changing the lengthwise extension length of the lengthwise member 1200 and the widthwise extension length of the widthwise member 1300, etc., without changing the cross-sectional shapes of the lengthwise member 1200 and the widthwise member 1300.

[0126] On the other hand, when the size of the battery case in the height direction is changed, it may be necessary to change the cross-sectional shapes of the length direction members 1200 and the width direction members 1300 unavoidably.

[0127] Therefore, the battery case of the present invention is not configured with a single longitudinal member 1200, a width member 1300, etc., but is designed to be divided into multiple components in the height direction and configured to be combined in the height direction, making it easy to respond to changes in the height direction of the battery case.

[0128] A battery case according to one embodiment of the present invention may include side frames 1100 , lengthwise members 1200 , and widthwise members 1300 .

[0129] The side frame 1100 may be provided to surround the side surface. For example, the side frame 1100 may be configured in a rectangular shape with an empty interior when viewed from above, and width direction members 1300, length direction members 1200, cooling panels 1400, etc. may be arranged inside the side frame 1100.

[0130] The longitudinal member 1200 may be formed inside the side frame 1100 to extend in the longitudinal direction, and may be installed across the interior of the side frame 1100. The longitudinal member 1200 may be formed to extend in the longitudinal direction, and a plurality of longitudinal members 1200 may be installed spaced apart in the width direction.

[0131] The longitudinal member 1200 may be provided inside the side frame 1100, extending in the longitudinal direction, and connected at both ends to the side frame 1100. For example, the longitudinal member 1200 may support the space between the front frame 1110 and the rear frame 1130 of the side frame 1100, which face each other. For example, two longitudinal members 1200 may be arranged spaced apart in the width direction inside the side frame 1100.

[0132] The longitudinal member 1200 may have components such as a first upper plate 1210, a first side plate 1230, and a first lower plate 1250. An upper longitudinal unit 1202 and a lower longitudinal unit 1201, which will be described later, may have components such as a first upper plate 1210, a first side plate 1230, and a first lower plate 1250, respectively.

[0133] The width direction member 1300 may be formed inside the side frame 1100 to extend in the width direction and may be connected to the length direction member 1200 so as to cross it.

[0134] The width direction members 1300 are provided inside the side frames 1100 and extend in the width direction, and a plurality of width direction members 1300 may be provided spaced apart in the length direction.

[0135] A plurality of widthwise units may be coupled in the height direction, and a cooling panel 1400 may be provided between adjacent widthwise units coupled in the height direction to penetrate therethrough.

[0136] Each width direction unit may have components such as a second upper plate 1310, a second side plate 1330, and a second lower plate 1350. A first lower width direction unit 1301-1, a second lower width direction unit 1301-2, and an upper width direction unit 1302, which will be described later, may have components such as a second upper plate 1310, a second side plate 1330, and a second lower plate 1350, respectively.

[0137] The longitudinal member 1200 may include a lower longitudinal unit 1201 and an upper longitudinal unit 1202 .

[0138] The lower longitudinal unit 1201 can be located at the bottom.

[0139] The upper longitudinal unit 1202 includes a plurality of first variable units 1202U having different heights, and at least one of the plurality of first variable units 1202U may be coupled to the upper side of the lower longitudinal unit 1201.

[0140] The height of the longitudinal member 1200 can be determined according to the height of the first adjustable unit 1202U selectively coupled to the upper longitudinal unit 1202.

[0141] As an example, the large battery case 12 may have a tall 1-1 variable unit 1202U-1 provided above the lower longitudinal unit 1201, and the small battery case 11 may have a short 1-2 variable unit 1202U-2 provided above the lower longitudinal unit 1201.

[0142] As an example, the battery case of the present invention can be a small battery case 11 and a large battery case 12, with the lower longitudinal unit 1201 of the longitudinal member 1200 being the same component, and the upper longitudinal unit 1202 being a first variable unit 1202U of a different height.

[0143] In the battery case of the present invention, the same components are used for the lower length direction unit 1201, so the basic structure of the battery case is maintained, but part changes are minimized to improve production efficiency and the size of the battery case can be freely changed.

[0144] The battery case of the present invention has the advantage of being able to easily accommodate changes in the height of the battery case by maintaining the lower longitudinal unit 1201 and selecting the height of the first adjustable unit 1202U that is coupled to the upper part of the lower longitudinal unit 1201.

[0145] The widthwise members 1300 may connect between adjacent lengthwise members 1200 or between a lengthwise member 1200 and a side frame 1100 .

[0146] The widthwise members 1300 can provide support between adjacent lengthwise members 1200 or between the lengthwise members 1200 and the side frames 1150 of the side frames 1100 .

[0147] FIG. 18 is a cross-sectional view showing a width direction member including an upper width direction unit 1302 in which a plurality of second variable units 1302U are replaced, and FIG. 19 is a view showing an example in which FIG. 18 is applied.

[0148] The width direction member 1300 may include a lower width direction unit 1301 and an upper width direction unit 1302 .

[0149] The lower width direction unit 1301 can be disposed on the lower side.

[0150] The upper width direction unit 1302 includes a plurality of second adjustable units 1302U having different heights, and at least one of the plurality of second adjustable units 1302U may be coupled to the upper side of the lower width direction unit 1301.

[0151] The upper width direction unit 1302 can determine the height of the width direction member 1300 depending on the height of the second variable unit 1302U selectively coupled thereto.

[0152] As an example, the large battery case 12 may have a tall 2-1 variable unit 1302U-1 provided above the lower width direction unit 1301, and the small battery case 11 may have a short 2-2 variable unit 1302U-2 provided above the lower width direction unit 1301.

[0153] As an example, the battery case of the present invention can be a small battery case 11 and a large battery case 12, with the same components being applied to the lower width direction unit 1301 of the longitudinal member 1200, and a second variable unit 1302U of a different height being applied to the upper width direction unit 1302.

[0154] The battery case of the present invention has the advantage that it can easily accommodate changes in the height direction of the battery case by maintaining the lower width direction unit 1301 and selecting the height of the second adjustable unit 1302U that is coupled to the upper part of the lower width direction unit 1301.

[0155] In the battery case of the present invention, the lower lengthwise unit 1201 and the lower widthwise unit 1301, which are commonly used in the small battery case 11 and the large battery case 12, may be configured to have corresponding heights. For example, the lower lengthwise unit 1201 and the lower widthwise unit 1301 may have the same height, which has the effect of efficiently dealing with the collision load of the battery case.

[0156] FIG. 20 is a view showing an embodiment of a battery case provided with a cross-section reinforcing member 1500 of the present invention, and FIG. 21 is a view showing another embodiment of a battery case provided with a cross-section reinforcing member 1500 of the present invention.

[0157] The battery case may further include a cross-sectional reinforcement member 1500.

[0158] The cross-sectional reinforcing member 1500 is provided inside the longitudinal member 1200 and is arranged at the connection point where the widthwise member 1300 is connected, and can provide support between the inner widthwise surfaces of the longitudinal member 1200.

[0159] The cross-sectional stiffening member 1500 provides support between the two widthwise inner faces of the longitudinal member 1200 .

[0160] The longitudinal member 1200 is formed to extend in the length direction and may have a hollow portion formed therein. The longitudinal member 1200 has an advantage in terms of weight reduction due to the hollow portion formed therein, but buckling may occur due to an impact load in the width direction, and the cross-sectional reinforcing member 1500 can reinforce this.

[0161] The upper longitudinal unit 1202 may have a closed cross section formed by coupling a selected first adjustable unit 1202U from among the plurality of first adjustable units 1202U to the upper side of the lower longitudinal unit 1201.

[0162] The upper longitudinal unit 1202 is configured as a U-shaped member with an open bottom, and the open part can be fitted into the upper side of the lower longitudinal unit 1201. In this case, an inset step 1270 into which the lower part of the upper longitudinal unit 1202 fits can be formed on the upper side of the lower longitudinal unit 1201. As an example, the lower end of the upper longitudinal unit 1202 can be placed on the inset step 1270 of the lower longitudinal unit 1201, and the upper longitudinal unit 1202 and the lower longitudinal unit 1201 can be welded together.

[0163] The lower longitudinal unit 1201 has a hat-shaped cross section with an open bottom, and the lower side is coupled to the bottom plate 1600 to form a closed cross section together with the bottom plate 1600 .

[0164] The cross-sectional reinforcing member 1500 can be configured as a reinforcing bulkhead 1501 that is provided inside the longitudinal member 1200 and that is arranged between adjacent widthwise members 1300 that are spaced apart in the width direction, and that provides support between the adjacent widthwise members 1300.

[0165] The reinforcing bulkhead 1501 serves to ensure the continuity of the cross section in the width direction between two widthwise members 1300 spaced apart in the width direction. The lengthwise member 1200 having the reinforcing bulkhead 1501 provided therein may be disposed between two widthwise members 1300 spaced apart in the width direction.

[0166] The reinforcing bulkhead 1501 and the width directional member 1300 may be disposed across the first side panel 1230 of the length directional member 1200. The reinforcing bulkhead 1501 may be joined to the inner surface of the first side panel 1230 of the length directional member 1200, and the width directional member 1300 may be joined to the inner surface of the first side panel 1230 of the length directional member 1200 at a position corresponding to the position where the reinforcing bulkhead 1501 is joined. As an example, the reinforcing bulkhead 1501 may be joined to the inner surface of the first side panel 1230 of the length directional member 1200 by welding.

[0167] A left width direction member 1300, a first left side panel 1230, a reinforcing bulkhead 1501, a first right side panel 1230, and a right width direction member 1300 may be arranged in the width direction.

[0168] As an example, referring to FIG. 20, the reinforcing bulkhead 1501 may be joined to the inner surface of the first side panel 1230 of the upper longitudinal unit 1202 of the longitudinal member 1200, and the upper widthwise unit 1302 of the widthwise member 1300 may be joined to the inner surface of the first side panel 1230 of the upper longitudinal unit 1202 corresponding to the position where the reinforcing bulkhead 1501 is joined.

[0169] As another example, referring to FIG. 21, the reinforcing bulkhead 1501 may be joined to the inner surface of the first side panel 1230 of the lower longitudinal unit 1201 of the longitudinal member 1200, and the second lower widthwise unit 1301-2 of the widthwise member 1300 may be joined to the inner surface of the first side panel 1230 of the lower longitudinal unit 1201 at a position corresponding to where the reinforcing bulkhead 1501 is joined.

[0170] The reinforcing bulkhead 1501 and the width direction member 1300 may have cross sections of corresponding shapes to each other. The reinforcing bulkhead 1501 and the width direction member 1300 may be disposed at corresponding positions across the first side panel 1230 of the length direction member 1200.

[0171] As an example, if the transverse member 1300 has a "U" shaped cross section, the reinforcing bulkhead 1501 may have a corresponding "U" shaped cross section.

[0172] As an example, if the width direction member 1300 includes a second upper plate 1310 and a pair of second side plates 1330, and includes a "U-shaped" cross section with an open bottom, the reinforcing bulkhead 1501 may have a corresponding "U-shaped" cross section.

[0173] The U-shaped cross-sectional portion of the width direction member 1300 and the U-shaped cross-sectional portion of the reinforcing bulkhead 1501 can be disposed at corresponding positions across the first side panel 1230 of the length direction member 1200. This allows the left width direction member 1300, the left first side panel 1230, the reinforcing bulkhead 1501, the right first side panel 1230, and the right width direction member 1300 to maintain cross-sectional continuity, thereby enabling stable resistance to widthwise impact loads.

[0174] The reinforcing bulkhead 1501 and the widthwise member 1300 may have cross sections with shapes that correspond to each other at least in part of the cross sections.

[0175] For example, if the width direction member 1300 has a "U-shaped" cross section including a "U-shaped" cross section, the reinforcing bulkhead 1501 may have a "U-shaped" cross section corresponding to the "U-shaped" cross section of the width direction member 1300. The "U-shaped" cross section of the width direction member 1300 and the "U-shaped" cross section of the reinforcing bulkhead 1501 may be disposed at corresponding positions across the first side panel 1230 of the length direction member 1200.

[0176] FIG. 22 is a view showing another embodiment of the battery case according to the present invention, in which a cross-section reinforcing member 1500 is provided.

[0177] The width direction member 1300 may be connected to the length direction member 1200 via a connecting bracket B. The cross-sectional reinforcing member 1500 may be provided inside the length direction member 1200 between adjacent connecting brackets B spaced apart in the width direction, and may be composed of a tubular reinforcing sleeve 1502 that provides support between the adjacent connecting brackets B.

[0178] The reinforcing sleeve 1502 serves to ensure the continuity of the cross section in the width direction between two connecting brackets B connected to the width direction member 1300. The length direction member 1200 having the reinforcing sleeve 1502 provided therein can be disposed between two connecting brackets B spaced apart in the width direction.

[0179] The reinforcing sleeve 1502 may support the two widthwise inner surfaces of the longitudinal member 1200. In addition, the two connecting brackets B and the longitudinal member 1200 may be fastened together using a reinforcing bolt member 1503. Specifically, the reinforcing bolt member 1503 may be fastened by passing through the left connecting bracket B, the longitudinal member 1200, the reinforcing sleeve 1502, and the right connecting bracket B.

[0180] The first bracket B1 of the connecting bracket B can be joined to the width direction member 1300 by bolting or welding, and the second bracket B2 of the connecting bracket B can be joined to the length direction member 1200 and the reinforcing sleeve 1502 by a reinforcing bolt member 1503.

[0181] The battery case may further include a cooling panel 1400.

[0182] A plurality of widthwise units may be coupled to the widthwise member 1300 in the height direction. The cooling panel 1400 is installed between adjacent widthwise units coupled in the height direction to cool the battery module C.

[0183] FIG. 23 is a diagram showing a width direction member 1300 and a cooling panel 1400 to which multiple width direction units are connected in the height direction, FIG. 24 is a cross-sectional view along line II' in FIG. 23, and FIG. 25 is a cross-sectional view along line II-II' in FIG. 23.

[0184] FIG. 26 shows a state in which a cooling panel 1400 is installed above the first lower widthwise unit 1301-1.

[0185] The width direction member 1300 may include a first lower width direction unit 1301-1 and a second lower width direction unit 1301-2.

[0186] The first lower widthwise unit 1301-1 is disposed below the cooling panel 1400 and may have the cooling panel 1400 and foam beads 1370 through which the cooling lines 1450 for cooling the cooling panel 1400 pass.

[0187] The first lower width direction unit 1301-1 may be combined with a bottom plate 1600 at the bottom, and a cooling panel 1400 and a cooling line 1450 for cooling the cooling panel 1400 may be disposed on foam beads 1370 formed on the top.

[0188] The first lower widthwise unit 1301-1 may include a second upper plate 1310, a pair of second side plates 1330, and a pair of second lower plates 1350. For example, the second lower plate 1350 may be joined to the bottom plate 1600 by welding. In the first lower widthwise unit 1301-1, the second upper plate 1310, the pair of second side plates 1330, and the pair of second lower plates 1350 may form a hat-shaped cross section.

[0189] The second lower width direction unit 1301-2 is disposed above the cooling panel 1400 and can be combined with the first lower width direction unit 1301-1.

[0190] Referring to FIG. 24, in the portion where the cooling panel 1400 is not disposed, the second lower width direction unit 1301-2 and the first lower width direction unit 1301-1 may be coupled by a method such as bolt joining.

[0191] Referring to FIG. 25, the second lower widthwise unit 1301-2 is disposed above the first lower widthwise unit 1301-1 across the cooling panel 1400, and the first lower widthwise unit 1301-1, the cooling panel 1400, and the second lower widthwise unit 1301-2 can be connected by bolt joints or the like.

[0192] The second lower widthwise unit 1301-2 may include a second upper plate 1310, a pair of second side plates 1330, and a pair of second lower plates 1350. For example, the second lower plate 1350 may be connected to the second upper plate 1310 of the first lower widthwise unit 1301-1 by a method such as bolting. In the second lower widthwise unit 1301-2, the second upper plate 1310, the pair of second side plates 1330, and the pair of second lower plates 1350 may form a hat-shaped cross section.

[0193] The first lower widthwise unit 1301-1 has a hat-shaped cross section with an open bottom, and is connected to the bottom plate 1600 at the bottom to form a closed cross section together with the bottom plate 1600. The first lower widthwise unit 1301-1 may have a foam bead 1370 at the top through which a cooling panel 1400 and a cooling line 1450 for cooling the cooling panel 1400 pass.

[0194] FIG. 27 is a detailed view of the portion where the width direction member 1300 is connected to the length direction member 1200.

[0195] The widthwise member 1300 may further include an upper widthwise unit 1302 .

[0196] The upper width direction unit 1302 is connected to the upper side of the second lower width direction unit 1301-2 and includes a plurality of second adjustable units 1302U having different heights, at least one of the plurality of second adjustable units 1302U is connected to the upper side of the lower width direction unit 1301, and the upper width direction unit 1302 can be joined to the longitudinal member 1200 via a connecting bracket B.

[0197] FIG. 28 is a view showing a cooling plate D of a comparative battery case that is compared with the battery case of the present invention, and FIG. 29 is a view showing a cooling panel 1400 of a battery case according to one embodiment of the present invention that is compared with the comparative example of FIG. 28.

[0198] FIG. 30 is a diagram showing a state in which an upper widthwise unit 1302 is additionally installed in FIG. 29, and FIG. 31 is a diagram showing a state in which a battery module C is installed between the lengthwise member 1200 and the widthwise member 1300 in FIG. 30.

[0199] The cooling panels 1400 may be arranged in unit spaces formed between adjacent longitudinal members 1200 spaced apart in the width direction or between a longitudinal member 1200 spaced apart in the width direction and a side frame 1100, with each unit cooling panel 1400M being arranged in each unit space.

[0200] The unit space is defined between two longitudinal members 1200 spaced apart in the width direction or between two longitudinal members 1200 spaced apart in the width direction. 1200 parts and the side frame 1100.

[0201] A front frame 1110 of the side frame 1100 may be disposed in front of the unit space, and a front frame 1110 of the side frame 1100 may be disposed in the rear of the unit space.

[0202] The sides of the unit space have two length directions 1200 parts are arranged at intervals in the width direction, or on one side of the unit space, 1200 parts is placed on the other side of the unit space in the longitudinal direction. 1200 parts A side frame 1150 may be arranged spaced apart from the center frame 1150 in the width direction.

[0203] That is, the unit space is defined by the front frame 1110, a pair of longitudinal 1200 parts , surrounded by the rear frame 1130, the front frame 1110, 1200 parts , and can be surrounded by side frames 1150 and rear frame 1130.

[0204] The unit cooling panel 1400M may be installed in the length direction across the interior of the side frame 1100. The unit cooling panel 1400M may be disposed below the battery module C to cool the battery module C. A cooling line 1450 may be connected to the unit cooling panel 1400M to supply cool air. The unit cooling panel 1400M may be installed individually in the unit space.

[0205] For example, two longitudinal members 1200 may be arranged spaced apart in the width direction inside the side frame 1100, and three unit spaces may be arranged spaced apart in the width direction. Three unit cooling panels 1400M may be provided in the three unit spaces. That is, a unit cooling panel 1400M formed integrally with the unit space may be provided, respectively.

[0206] The cooling panel 1400 may be composed of three unit cooling panels 1400M, and the three unit cooling panels 1400M may be spaced apart in the width direction.

[0207] One unit cooling panel 1400M is disposed between two longitudinal members 1200 spaced apart in the width direction, and one unit cooling panel 1400M is disposed between the left side frame 1100 in the width direction and the longitudinal member 1200. 1200 parts and one unit cooling panel 1400M is disposed between the right side frame 1100 in the width direction, so that a total of three unit cooling panels 1400M can be provided.

[0208] Although this specification illustrates and describes the arrangement as including three unit cooling panels 1400M, this is not necessarily limited to this, and two or four or more unit cooling panels 1400M may be formed.

[0209] If the cooling panel 1400 is provided over the entire battery case and the cooling water flows throughout the entire battery case, the cooling flow path becomes long and the cooling temperature loss increases, resulting in a problem of reduced cooling performance.

[0210] The cooling panel 1400 has the effect of preventing the cooling flow path from becoming excessively long by individually installing the unit cooling panels 1400M in the unit space, thereby improving cooling performance, and reducing the size of the unit cooling panels 1400M to reduce the springback phenomenon of the unit cooling panels 1400M that may occur during molding of the unit cooling panels 1400M, thereby facilitating molding and assembly of the unit cooling panels 1400M.

[0211] The unit cooling panel 1400M may be formed of a single member provided across the plurality of width direction members 1300 arranged inside the side frame 1100 at intervals in the length direction.

[0212] 28, in the comparative example, unlike the embodiment of the present invention, a divided cooling plate D must be provided, and an additional tube structure E is required to connect the flow paths of the cooling plate D in each region. Also, in order to connect the tubes, a space through which the flow paths pass must be secured at the upper end of the width direction member 1300, or holes must be drilled in the width direction member 1300 to secure the flow paths. Therefore, the comparative example has many structural problems in terms of maximizing battery capacity in a limited space and protecting it from external impacts.

[0213] Referring to Figure 29, in the embodiment, like the comparative example, the unit cooling panel 1400M is composed of a single member that is installed across the entirety of multiple widthwise members 1300 that are spaced apart longitudinally inside the side frame 1100. Therefore, unlike the comparative example, there is no need to install multiple cooling plates D divided into unit spaces, and no additional tube structure E is required to connect the flow paths of the cooling plates D in each area, which has the effect of maximizing battery capacity while providing stable protection from external impacts.

[0214] The unit cooling panel 1400M may include a cooling module plate 1410 and a connecting module plate 1430.

[0215] The cooling module plates 1410 are provided in a plurality at intervals along the length direction to cool the battery modules C.

[0216] The connecting module plate 1430 can connect between two cooling module plates 1410 .

[0217] The cooling module plate 1410 and the connecting module plate 1430 can be integrally fabricated from a single metal plate such as steel.

[0218] The cooling module plate 1410 is arranged between adjacent widthwise members 1300 spaced apart in the longitudinal direction to cool the battery module C, and the connecting module plate 1430 has a width smaller than that of the cooling module plate 1410 and can be arranged between the first lower widthwise unit 1301-1 of the widthwise member 1300 and the second lower widthwise unit 1301-2 of the widthwise member 1300.

[0219] The battery module C may be disposed between two adjacent width direction members 1300 spaced apart in the length direction.

[0220] The connecting module plate 1430 is provided with a width smaller than that of the cooling module plate 1410, so that the transfer of cool air to the width direction member 1300 can be minimized while connecting the two cooling module plates 1410 together.

[0221] Furthermore, although the connecting module plate 1430 is provided with a smaller width than the cooling module plate 1410, since the connecting module plate 1430 is provided between the first lower width direction unit 1301-1 and the second lower width direction unit 1301-2 which are connected in the height direction, the rigidity is reinforced by the first lower width direction unit 1301-1 and the second lower width direction unit 1301-2, and problems such as breakage of the connecting module plate 1430 may not occur.

[0222] For example, the connecting module plate 1430 may be disposed so as to be completely inserted between the first lower width direction unit 1301-1 and the second lower width direction unit 1301-2.

[0223] As another example, a portion of the connecting module plate 1430 may be provided between the first lower width direction unit 1301-1 and the second lower width direction unit 1301-2, and another portion of the connecting module plate 1430 may be arranged away from the first lower width direction unit 1301-1 and the second lower width direction unit 1301-2.

[0224] For example, the cooling panel 1400 may be provided across four width direction members 1300 spaced apart in the length direction. The cooling panel 1400 may be configured in a shape in which three cooling module plates 1410 are connected, and the cooling module plate 1410 may be disposed between two adjacent width direction members 1300. However, the cooling panel 1400 is not divided by the width direction members 1300.

[0225] Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and it will be apparent to those skilled in the art that various modifications and variations are possible within the scope that does not deviate from the technical idea of ​​the present invention as set forth in the claims. [Explanation of symbols]

[0226] 100, 1100 side frame 110, 1110 Front frame 130, 1130 Rear frame 150, 1150 Side frame 200, 1200 Longitudinal members 201, 1201 Lower longitudinal unit 202, 1202 Upper longitudinal unit 210, 1210 First upper plate 230, 1230 1st side plate 250, 1250 1st lower plate 270, 1270: Inner step portion 300, 1300: Width direction member 301, 1301 Lower width unit 301-1, 1301-1 First lower width direction unit 301-2, 1301-2 Second lower width direction unit 302, 1302 Upper width direction unit 310, 1310 2nd top plate 330, 1330 2nd side plate 350, 1350 2nd lower plate 370, 1370 foam beads 400, 1400 cooling panel 400M, 1400M unit cooling panel 410, 1410 cooling module board 430, 1430 connecting module board 450, 1450 Cooling line 500, 1500 Cross section reinforcement member 501, 1501 Reinforced bulkhead 502, 1502 Reinforced sleeve 503, 1503 Reinforcement bolt member 600, 1600 Bottom plate B Connecting bracket B1 First bracket B2 Second bracket C Battery module D Cooling plate E Tube structure

Claims

1. Side frames and a longitudinal member disposed inside the side frame and extending in the longitudinal direction; a width direction member including a first lower width direction unit and a second lower width direction unit, the width direction member being disposed inside the side frame, extending in a width direction, connected to the length direction member so as to intersect with the length direction member, and overlapping with the height direction; a cooling panel disposed above the first lower width direction unit to cool the battery module; Including, the first lower width direction unit is disposed below the cooling panel, The second lower width unit is disposed above the cooling panel and is coupled to the first lower width unit.

2. The width direction member is The battery case according to claim 1 , wherein the connecting members are connected between adjacent longitudinal members or between the longitudinal members and the side frames.

3. The battery case according to claim 1 , wherein the first lower widthwise unit has foam beads through which the cooling panel passes.

4. The first lower width direction unit is The battery case according to claim 3 , wherein the battery case has a hat-shaped cross section with an open bottom, and the lower side is connected to a bottom plate to form a closed cross section together with the bottom plate.

5. The width direction member is an upper width direction unit coupled to the upper side of the second lower width direction unit and joined to the length direction member via a connecting bracket; The battery case of claim 3 further comprising:

6. The longitudinal members include: a lower longitudinal unit having a hat-shaped cross section with an open lower portion, the lower side of which is connected to a bottom plate to form a closed cross section together with the bottom plate; an upper longitudinal unit coupled to the upper side of the lower longitudinal unit to form a closed cross section together; The battery case of claim 1 , comprising:

7. a cross-sectional reinforcing member provided inside the longitudinal member, arranged at a connection point where the widthwise members are connected, and supporting the inner surfaces of the longitudinal members in the width direction; The battery case of claim 1 further comprising:

8. The cross-sectional reinforcing member is 8. The battery case according to claim 7, wherein the battery case is configured with a reinforcing bulkhead provided inside the longitudinal member disposed between adjacent widthwise members spaced apart in the width direction, and providing support between the adjacent widthwise members.

9. The battery case according to claim 8 , wherein the reinforcing bulkhead and the width direction member have cross sections with shapes at least partially corresponding to each other.

10. The width direction member is connected to the length direction member via a connecting bracket, The cross-sectional reinforcing member is 8. The battery case according to claim 7, wherein the battery case is configured with a tubular reinforcing sleeve provided inside the longitudinal member disposed between adjacent connecting brackets spaced apart in the width direction, and providing support between the adjacent connecting brackets.

11. The cooling panel is 2. The battery case according to claim 1, wherein a unit cooling panel is disposed in each unit space formed between adjacent longitudinal members spaced apart in the width direction or between the longitudinal members spaced apart in the width direction and the side frames.

12. The unit cooling panel comprises: The battery case according to claim 11 , which is formed of a single member provided across a plurality of widthwise members spaced apart from each other in the longitudinal direction inside the side frame.

13. The unit cooling panel comprises: a plurality of cooling module plates spaced apart along a length direction to cool the battery modules; a connecting module plate that connects adjacent cooling module plates; The battery case of claim 11 , comprising:

14. the cooling module plate is disposed between adjacent width direction members spaced apart in the length direction to cool the battery modules; The battery case according to claim 13 , wherein the connecting module plate has a width smaller than that of the cooling module plate and is disposed between the first lower width unit and the second lower width unit.

15. The width direction member is an upper width direction unit including a plurality of second variable units having different heights and coupled to an upper side of the second lower width direction unit, at least one of the plurality of second variable units being coupled to an upper side of the second lower width direction unit; further comprising The battery case according to claim 3 , wherein the upper widthwise unit is joined to the lengthwise member via a connecting bracket.

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