Battery case

Abstract

The present invention provides a battery case that can efficiently withstand collision loads. Furthermore, it provides a battery case that minimizes component changes, improves production efficiency, and allows for easy size adjustments. [Solution] The present invention provides a battery case comprising: a side frame 100; a longitudinal member 200 disposed inside the side frame and formed to extend in the longitudinal direction; a widthwise member 300 disposed inside the side frame and formed to extend in the width direction, connected to intersect with the longitudinal member, and including a first lower widthwise unit and a second lower widthwise unit arranged in superimposed in the height direction; and a cooling panel 400 disposed above the first lower widthwise unit to cool the battery module.

Description

Technical Field

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

Background Art

[0002] It should be clearly noted that the content described in this section merely provides background information for the present invention and does not constitute the prior art.

[0003] Battery electric vehicles (hereinafter referred to as electric vehicles), which use the electrical energy of a battery as a driving source, continue to increase in production and sales as a means to solve the environmental problems of existing internal combustion engine vehicles.

[0004] Due to the expected increase in the sales of electric vehicles, there is a tendency to introduce a dedicated platform for electric vehicles that is different from the platform structures used in common with existing internal combustion engine vehicles, etc. The main purpose of introducing a dedicated platform is that a new structure is required to mount a battery with sufficient capacity to extend the driving range.

[0005] For this purpose, it is necessary to secure a space under the vehicle for mounting a high-capacity battery, and thus the space for absorbing collision energy will be reduced. Although a structure for reinforcing the underbody of the vehicle is also required to absorb collision energy in a narrow space, a reinforcing structure is also needed for the battery itself to prevent an external collision load and damage to the battery cells.

[0006] The reinforcing structure may generally include a longitudinal member that prevents collision loads from the front and rear, and a transverse member that prevents collision loads from the width direction. Generally, in order to efficiently prevent collision loads, the connectivity of the corresponding members must be good, and the longitudinal member and the transverse member generally must be welded.

[0007] The battery module can be assembled within a compartment divided by longitudinal and widthwise members, and protected from external impacts. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Korean Registered Utility Model Publication No. 20-0193173 [Overview of the project] [Problems that the invention aims to solve]

[0009] As one aspect of this invention, the present invention provides a battery case that can efficiently withstand collision loads.

[0010] As one aspect of this invention, the present invention provides a battery case that minimizes changes in components, improves production efficiency, and allows for easy size changes. [Means for solving the problem]

[0011] As one aspect of achieving the above objectives, the present invention provides a battery case comprising: a side frame; a longitudinal member disposed inside the side frame and extending in the longitudinal direction; a widthwise member disposed inside the side frame, extending in the width direction, connected to intersect with the longitudinal member, and including a first lower widthwise unit and a second lower widthwise unit superimposed in the height direction; and a cooling panel disposed above the first lower widthwise unit for cooling the battery module.

[0012] As another aspect for achieving the above objectives, the present invention provides a battery case comprising: a side frame; a longitudinal member formed extending longitudinally within the side frame; and a widthwise member formed extending widthwise within the side frame and connected to intersect with the longitudinal member, wherein the longitudinal member comprises a lower longitudinal unit positioned on the lower side; and a plurality of first variable units having different heights, with at least one of the plurality of first variable units coupled to the upper side of the lower longitudinal unit.

[0013] The widthwise members can connect adjacent lengthwise members or connect the lengthwise members to the side frames.

[0014] The above widthwise member is, It includes a first lower widthwise unit and a second lower widthwise unit that are arranged in a superimposed manner in the height direction, The above battery case is A cooling panel positioned above the first lower widthwise unit described above may further be included for cooling the battery module.

[0015] The first lower widthwise unit is positioned below the cooling panel and has foam beads through which the cooling panel passes, and the second lower widthwise unit is positioned above the cooling panel and can be coupled with the first lower widthwise unit.

[0016] The first lower widthwise unit described above has a cap-shaped cross-section with an open bottom, and its lower side can be connected to a bottom plate to form a closed cross-section together with the bottom plate.

[0017] The above-mentioned widthwise member may further include an upper widthwise unit that is coupled to the upper side of the second lower widthwise unit and joined to the longitudinal member via a connecting bracket.

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

[0019] It can further include a cross-section reinforcing member provided inside the longitudinal member, disposed at a connection point where the width-direction member is connected, and supporting between the inner surfaces in the width direction of the longitudinal member.

[0020] The cross-section reinforcing member can be provided inside the longitudinal member disposed between adjacent width-direction members spaced apart in the width direction, and can be composed of a reinforcing bulkhead that supports between the adjacent width-direction members.

[0021] The reinforcing bulkhead and the width-direction member can have cross-sections with at least a part of the cross-sections corresponding to each other.

[0022] The width-direction member is coupled to the longitudinal member through a connection bracket, and the cross-section reinforcing member can be provided inside the longitudinal member disposed between adjacent connection brackets spaced apart in the width direction, and can be composed of a tubular reinforcing sleeve that supports between the adjacent connection brackets.

[0023] The cooling panel can be arranged in a unit space formed between adjacent longitudinal members arranged spaced apart in the width direction or between the longitudinal member arranged spaced apart in the width direction component and the side frame, respectively.

[0024] The unit cooling panel can be composed of a single member provided over a plurality of width-direction members arranged spaced apart in the length direction inside the side frame.

[0025] A plurality of the above-mentioned unit cooling panels are provided at intervals along the length direction to cool the battery module, and may include a cooling module plate; and a connecting module plate connecting between adjacent cooling module plates.

[0026] The above-mentioned cooling module plate is disposed between adjacent width direction members disposed at intervals in the length direction to cool the battery module. The connecting module plate is provided with a smaller width than the cooling module plate and can be disposed between the first lower width direction unit of the width direction member and the second lower width direction unit of the width direction member.

[0027] The above-mentioned 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, and at least one of the plurality of second variable units is coupled to the upper side of the lower width direction unit.

[0028] The above-mentioned lower length direction unit has a hat-shaped cross section with an open lower part, and the lower side is coupled to the bottom plate to form a closed cross section together with the bottom plate. The upper length direction unit can form a closed cross section while the above-mentioned first variable unit selected from the plurality of above-mentioned first variable units is coupled to the upper side of the lower length direction unit.

[0029] The above-mentioned width direction member further includes an upper width direction unit coupled to the upper side of the second lower width direction unit and including a plurality of second variable units having different heights, and at least one of the plurality of second variable units is coupled to the upper side of the lower width direction unit. The upper width direction unit can be joined to the length direction member through a connecting bracket.

Advantages of the Invention

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

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

[0032] [Figure 1] This is a perspective view of a battery case according to one embodiment of the present invention. [Figure 2] This drawing shows a widthwise member and a cooling panel, in which multiple widthwise units are joined in the height direction. [Figure 3] This is a cross-sectional view taken along the line I-I' in Figure 2. [Figure 4] This is a cross-sectional view taken along the line II-II' in Figure 2. [Figure 5] This is a diagram showing the state in which a cooling panel is installed on the upper side of the first lower widthwise unit. [Figure 6] This drawing shows the details of the portion where the widthwise member is connected to the lengthwise member. [Figure 7] This drawing shows one embodiment of the present invention in which a cross-sectional reinforcing member is provided for the battery case. [Figure 8] This drawing shows another embodiment of the battery case of the present invention, in which a cross-sectional reinforcing member is provided. [Figure 9] This drawing shows another embodiment of the battery case of the present invention, in which a cross-sectional reinforcing member is provided. [Figure 10] This drawing shows a cooling plate of a comparative battery case for comparison with the battery case of the present invention. [Figure 11] This figure shows a cooling panel for a battery case according to one embodiment of the present invention, in contrast to the comparative example in Figure 10. [Figure 12] Figure 11 is a diagram showing the state in which an upper widthwise unit has been added. [Figure 13] This diagram shows a battery module installed between the longitudinal member and the widthwise member in Figure 12. [Figure 14]This is a perspective view of a battery case according to another embodiment of the present invention. [Figure 15] These are plan views of a small battery case and a large battery case. [Figure 16] This is a cross-sectional view showing a longitudinal member including an upper longitudinal unit in which multiple first variable units are alternated. [Figure 17] Figure 3 is a diagram showing an example of how it is applied. [Figure 18] This is a cross-sectional view showing a widthwise member including an upper widthwise unit in which multiple second variable units are alternated. [Figure 19] Figure 18 is a diagram showing an example of its application. [Figure 20] This drawing shows one embodiment of the present invention in which a cross-sectional reinforcing member is provided for the battery case. [Figure 21] This drawing shows another embodiment of the battery case of the present invention, in which a cross-sectional reinforcing member is provided. [Figure 22] This drawing shows another embodiment of the battery case of the present invention, in which a cross-sectional reinforcing member is provided. [Figure 23] This drawing shows a widthwise member and a cooling panel, in which multiple widthwise units are joined in the height direction. [Figure 24] This is a cross-sectional view along the line I-I' in Figure 23. [Figure 25] This is a cross-sectional view taken along the line II-II' in Figure 23. [Figure 26] This is a diagram showing the state in which a cooling panel is installed on the upper side of the first lower widthwise unit. [Figure 27] This drawing shows the details of the portion where the widthwise member is connected to the lengthwise member. [Figure 28] This drawing shows a cooling plate of a comparative battery case for comparison with the battery case of the present invention. [Figure 29] This figure shows a cooling panel for a battery case according to one embodiment of the present invention, in comparison with the comparative example in Figure 28. [Figure 30]Figure 29 is a diagram showing the state in which an upper widthwise unit has been added. [Figure 31] This diagram shows a state in which a battery module is installed between the longitudinal member and the widthwise member of Figure 30. [Modes for carrying out the invention]

[0033] Preferred embodiments of the present invention will be described below with reference to the attached drawings. However, 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, embodiments of the present invention are provided to give a more complete explanation of the present invention to a person with average skill in the art. Accordingly, the shapes and sizes of elements in the drawings may be enlarged or reduced (or highlighted or simplified) for a clearer explanation.

[0034] Referring to the drawings, the battery case of the present invention is shown in terms of width, height, and length, and the detailed description of the invention also uses terms related to width, height, and length. However, this is for the 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 in the attached diagram represents the length of the battery case, the Y-axis represents the width of the battery case, and the Z-axis represents the height of the battery case.

[0036] Figures 1 to 14 are drawings relating to a battery case according to one embodiment of the present invention, and Figures 15 to 31 are drawings relating to a battery case according to another embodiment of the present invention.

[0037] In the following, the components included in a battery case according to one embodiment of the present invention will be specifically described with reference to Figures 1 and 2.

[0038] Figure 1 is a perspective view of a battery case according to one embodiment of the present invention, and Figure 2 is a drawing showing a widthwise member 300 and a cooling panel 400, to which multiple widthwise units are connected in the height direction.

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

[0040] The side frame 100 can be provided so as to surround the sides. For example, the side frame 100 can be configured as a rectangular shape with an empty interior on a flat surface, and widthwise members 300, lengthwise members 200, cooling panels 400, etc., can be arranged inside the side frame 100.

[0041] The longitudinal members 200 can be formed extending in the longitudinal direction inside the side frame 100, and can be provided traversing the interior of the side frame 100. Multiple longitudinal members 200 can be formed extending in the longitudinal direction and provided spaced apart in the width direction.

[0042] The longitudinal member 200 is provided inside the side frame 100, is formed to extend in the longitudinal direction, and can be connected to the side frame 100 at both ends. For example, the longitudinal member 200 can support the space between the opposing front frame 110 and rear frame 130 of the side frame 100. For example, two longitudinal members 200 can be arranged inside the side frame 100, spaced apart in the width direction.

[0043] The widthwise member 300 may include a first lower widthwise unit 301-1 and a second lower widthwise unit 301-2 that are formed inside the side frame 100, extending in the widthwise direction and connected to the longitudinal member 200 so as to intersect, and are arranged in a superimposed position in the height direction.

[0044] The widthwise members 300 are provided inside the side frame 100, are formed to extend in the width direction, and multiple members can be provided spaced apart in the length direction.

[0045] Multiple widthwise units are connected in the height direction, and a cooling panel 400 can be installed penetrating between adjacent widthwise units connected in the height direction.

[0046] Each widthwise unit may have components such as a second upper plate 310, a second side plate 330, and a second lower plate 350. The first lower widthwise unit 301-1, the second lower widthwise unit 301-2, the upper widthwise unit 302, etc., described later, may each 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 provided between adjacent widthwise units that are coupled in the height direction, and can cool the battery module C.

[0048] The widthwise member 300 can connect adjacent longitudinal members 200, or connect the longitudinal member 200 to the side frame 100.

[0049] The widthwise member 300 can support the space between adjacent longitudinal members 200, or it can support the space between the longitudinal member 200 and the side frame 150 of the side frame 100.

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

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

[0052] The first lower widthwise unit 301-1 is positioned 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 can be coupled to a bottom plate 600 at its lower side, and a cooling panel 400 can be placed on foam beads 370 formed on its 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 plates 350 may be joined to the bottom plate 600 by welding. The first lower widthwise unit 301-1 may have a cap-shaped cross section formed by the second upper plate 310, the pair of second side plates 330, and the pair of second lower plates 350.

[0055] The second lower widthwise unit 301-2 is positioned above the cooling panel 400 and can be coupled with the first lower widthwise unit 301-1.

[0056] Referring to Figure 3, in the area where the cooling panel 400 is not located, the second lower widthwise unit 301-2 and the first lower widthwise unit 301-1 can be joined by a method such as bolting.

[0057] Referring to Figure 4, the second lower widthwise unit 301-2 is positioned above the first lower widthwise unit 301-1, with the cooling panel 400 in between, and the first lower widthwise unit 301-1, the cooling panel 400, and the second lower widthwise unit 301-2 can be connected by bolts 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 can be connected to the second upper plate 310 of the first lower widthwise unit 301-1 by a method such as bolting. The second lower widthwise unit 301-2 may have a cap-shaped cross-section formed by the second upper plate 310, the pair of second side plates 330, and the pair of second lower plates 350.

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

[0060] Figure 6 is a detailed drawing showing the portion where the widthwise member 300 is connected to the lengthwise member 200.

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

[0062] The upper widthwise unit 302 is connected to the upper side of the second lower widthwise unit 301-2. Although not shown in the figures, depending on the size of the battery case, multiple upper widthwise units 302 can be stacked and connected in the height direction to the upper side of the second lower widthwise unit 301-2.

[0063] The upper widthwise 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 widthwise 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 can be joined to the second upper plate 310 of the second lower widthwise unit 301-2 by a method such as welding.

[0065] Figure 7 is a drawing showing one embodiment in which the cross-sectional reinforcing member 500 of the present invention is provided, and Figure 8 is a drawing showing another embodiment in which the cross-sectional reinforcing member 500 of the present invention is provided.

[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 cap-shaped cross-section with an open bottom, and its lower side can be connected to the bottom plate 600 to form a closed cross-section together with the bottom plate 600.

[0069] The upper longitudinal unit 202 is composed of a "U-shaped" member with an open lower section, and the open section can be fitted onto the upper side of the lower longitudinal unit 201. In this case, an inward-recessed stepped section 270 can be formed on the upper side of the lower longitudinal unit 201 into which the lower part of the upper longitudinal unit 202 fits. As an example, the lower end of the upper longitudinal unit 202 is placed on the inward-recessed stepped section 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 longitudinal unit may have components such as a first upper plate 210, a first side plate 230, and a first lower plate 250. The upper longitudinal unit 202 and the lower longitudinal unit 201, which will be described later, may also 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 positioned at the connection point where the widthwise member 300 is connected, and can support the space between the widthwise inner surfaces of the longitudinal member 200.

[0073] The cross-sectional reinforcing member 500 serves to support the space between the two widthwise inner surfaces of the longitudinal member 200.

[0074] The longitudinal member 200 is formed to extend in the longitudinal direction and can have a hollow section inside. While the formation of a hollow section in the longitudinal member 200 is advantageous for weight reduction, buckling may occur due to impact loads in the width direction, so the cross-sectional reinforcing member 500 can reinforce it.

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

[0076] The reinforcing bulkhead 501 serves to ensure continuity of the cross-section in the width direction between two width-direction members 300 that are spaced apart in the width direction. The longitudinal member 200, which has the reinforcing bulkhead 501 inside, can be positioned between two width-direction members 300 that are spaced apart in the width direction.

[0077] The reinforcing bulkhead 501 and the widthwise member 300 can be positioned with the first side plate 230 of the longitudinal member 200 in between. The reinforcing bulkhead 501 can be joined to the inner surface of the first side plate 230 of the longitudinal member 200, and the widthwise member 300 can be joined to the inner surface of the first side plate 230 of the longitudinal member 200 corresponding to the position where the reinforcing bulkhead 501 is joined. As an example, the reinforcing bulkhead 501 can be joined to the inner surface of the first side plate 230 of the longitudinal member 200 by welding.

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

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

[0080] As another example, referring to Figure 8, the reinforcing bulkhead 501 can be joined to the inner surface of the first side plate 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 can be joined to the inner surface of the first side plate 230 of the lower longitudinal unit 201 corresponding to the position where the reinforcing bulkhead 501 is joined.

[0081] The reinforcing bulkhead 501 and the widthwise member 300 may have cross-sections of corresponding shapes. The reinforcing bulkhead 501 and the widthwise member 300 may be positioned at corresponding locations on either side of the first side plate 230 of the lengthwise member 200.

[0082] For example, if the widthwise member 300 has a "U-shaped" cross-section, the reinforcing bulkhead 501 can have a corresponding "U-shaped" cross-section.

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

[0084] The U-shaped cross-section of the widthwise member 300 and the U-shaped cross-section of the reinforcing bulkhead 501 can be positioned in corresponding locations, sandwiching the first side plate 230 of the lengthwise member 200. This allows for the maintenance of cross-sectional continuity between the left widthwise member 300, the left first side plate 230, the reinforcing bulkhead 501, the right first side plate 230, and the right widthwise member 300, enabling stable resistance to impact loads in the widthwise direction.

[0085] The reinforcing bulkhead 501 and the widthwise member 300 may have cross-sections in which at least a portion of the cross-section corresponds to each other.

[0086] For example, if the widthwise member 300 has a U-shaped cross-section that includes a U-shaped section, the reinforcing bulkhead 501 can have a U-shaped cross-section that corresponds to the U-shaped cross-section of the widthwise member 300. The U-shaped cross-section of the widthwise member 300 and the U-shaped cross-section of the reinforcing bulkhead 501 can be positioned at corresponding locations, sandwiching the first side plate 230 of the longitudinal member 200.

[0087] Figure 9 is a drawing showing another embodiment in which the cross-sectional reinforcing member 500 of the battery case of the present invention is provided.

[0088] The widthwise member 300 can be connected to the lengthwise member 200 via the connecting bracket B. The cross-sectional reinforcing member 500 can be provided inside the lengthwise member 200, which is positioned between adjacent connecting brackets B spaced apart in the widthwise direction, and can consist of a tubular reinforcing sleeve 502 that supports the space between adjacent connecting brackets B.

[0089] The reinforcing sleeve 502 serves to ensure continuity of the cross-section in the width direction between the two connecting brackets B connected to the width direction member 300. The longitudinal direction member 200, which has the reinforcing sleeve 502 inside, can be positioned between the two connecting brackets B that are spaced apart in the width direction.

[0090] The reinforcing sleeve 502 can support the space between the two widthwise inner surfaces of the longitudinal member 200. Furthermore, the two connecting brackets B and the longitudinal member 200 can be fastened together via the reinforcing bolt member 503. Specifically, the reinforcing bolt member 503 can 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 connecting bracket B can be joined to the widthwise member 300 by bolting or welding, and the second bracket B2 of connecting bracket B can be fastened together with the lengthwise member 200 and the reinforcing sleeve 502 by a reinforcing bolt member 503.

[0092] Figure 10 is a drawing showing the cooling plate D of a comparative battery case for comparison with the battery case of the present invention, and Figure 11 is a drawing showing the cooling panel 400 of a battery case according to one embodiment of the present invention for comparison with the comparative example in Figure 10.

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

[0094] The cooling panel 400 is located between adjacent longitudinal members 200 that are spaced apart in the width direction or in the longitudinal direction that are spaced apart in the width direction. Component 200 Unit cooling panels 400M can be placed in the unit space formed between the side frame 100 and the main body.

[0095] The unit space is between two longitudinal members 200 that are spaced apart in the width direction or in the length direction that are spaced apart in the width direction Component 200 It can be formed between the side frame 100 and the side frame 100.

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

[0097] On the side of a unit space are two longitudinal directions Component 200 They are arranged spaced apart in the width direction, or one side of the unit space is spaced apart in the length direction. Component 200 They are arranged, and the other side of the unit space is in the length direction Component 200 The side frames 150 can be positioned spaced apart in the width direction.

[0098] In other words, the unit space is the front frame 110, and a pair of longitudinal directions. Component 200 , surrounded by the rear frame 130, or the front frame 110, in the longitudinal direction Component 200 It can be enclosed by a side frame 150 and a rear frame 130.

[0099] A unit cooling panel 400M can be provided longitudinally across the interior of the side frame 100. A unit cooling panel 400M can be positioned beneath the battery module C to cool the battery module C. A unit cooling panel 400M can be supplied with cool air by being connected to a cooling line 450. A unit cooling panel 400M can be provided individually within a unit space.

[0100] As an example, within the side frame 100, two longitudinal members 200 can be arranged spaced apart in the width direction, and three unit spaces can be arranged spaced apart in the width direction. Three unit cooling panels 400M can be provided in the three unit spaces. That is, a unit cooling panel 400M, integrally formed in each unit space, can be provided.

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

[0102] When one unit cooling panel 400M is positioned between two longitudinal members 200 that are spaced apart in the width direction, and when one unit cooling panel 400M is positioned between the left side frame 100 in the width direction and the longitudinal member 200, the length direction Component 200 A unit cooling panel 400M is placed between the right side frame 100 in the width direction, and a total of three unit cooling panels 400M can be provided.

[0103] In this specification, three unit cooling panels 400M are shown and described, but the invention is not necessarily limited to this configuration, and two or more unit cooling panels 400M may be formed.

[0104] If the cooling panel 400 is installed throughout the entire battery case and the cooling water flows throughout the entire structure, there is a problem that the cooling channel becomes longer, leading to increased cooling temperature loss and a decrease in cooling performance.

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

[0106] The unit cooling panel 400M can consist of a single member that extends across the entire lengthwise portion of multiple widthwise members 300, which are arranged longitudinally spaced apart inside the side frame 100.

[0107] Figure 10 is a drawing showing the cooling plate D of a comparative battery case for comparison with the battery case of the present invention, and Figure 11 is a drawing showing the cooling panel 400 of a battery case according to one embodiment of the present invention for comparison with the comparative example in Figure 10.

[0108] Referring to Figure 10, 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 plates D in each area. Furthermore, in order to connect the tube structure E, it is necessary to secure space for the flow paths at the upper end of the widthwise member 300, or to make holes in the widthwise member 300 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.

[0109] Referring to Figure 11, the embodiment, unlike the comparative example, has the effect of maximizing battery capacity while providing stable protection from external impacts, as the embodiment consists of a single member that extends across the entire lengthwise member 300, which is arranged longitudinally spaced apart inside the side frame 100, and the unit cooling panel 400M is composed of a single member that extends across the entire widthwise member 300, which is arranged longitudinally spaced apart inside the side frame 100.

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

[0111] Multiple cooling module plates 410 can be provided spaced apart along their length to cool the battery module C.

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

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

[0114] The battery module C can be positioned between two adjacent widthwise members 300 that are spaced apart in the longitudinal direction.

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

[0116] The connecting module plate 430 is provided with a smaller width than the cooling module plate 410, thereby minimizing the transfer of cold air to the widthwise member 300 while connecting the two cooling module plates 410.

[0117] Furthermore, although the connecting module plate 430 is provided with a smaller width than the cooling module plate 410, by providing the connecting module plate 430 between the first lower widthwise unit 301-1 and the second lower widthwise unit 301-2, which are connected in the height direction, the rigidity is reinforced by the first lower widthwise unit 301-1 and the second lower widthwise unit 301-2, which may prevent problems such as damage to the connecting module plate 430.

[0118] As an example, the connecting module plate 430 can be positioned so as to fit completely between the first lower widthwise unit 301-1 and the second lower widthwise unit 301-2.

[0119] As another example, a portion of the connecting module plate 430 may be provided across the first lower widthwise unit 301-1 and the second lower widthwise unit 301-2, while another portion of the connecting module plate 430 may be positioned away from the first lower widthwise unit 301-1 and the second lower widthwise unit 301-2.

[0120] As an example, the cooling panel 400 can be provided across four widthwise members 300 that are spaced apart in the longitudinal direction. The cooling panel 400 can be configured in a shape in which three cooling module plates 410 are connected, and the cooling module plates 410 can be placed between two adjacent widthwise members 300. However, the cooling panel 400 is not divided by the widthwise members 300.

[0121] In the following, with reference to Figures 14 to 17, the components included in a battery case according to another embodiment of the present invention will be specifically described.

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

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

[0124] The small battery case 1 and the large battery case 2 can have their dimensions in the length direction (X-axis), width direction (Y-axis), and height direction (Z-axis) changed to accommodate the changing size of electric vehicles and ensure the required battery capacity accordingly. This also allows for changes in the dimensions of components included in the battery case of the present invention, such as the length direction member 1200 and the width direction member 1300.

[0125] In this case, if the size of the battery case needs to be changed in the length and width directions, this can be easily accommodated by changing the length extension of the length direction member 1200, the width extension of the width direction member 1300, etc., without changing the cross-sectional shape of the length direction member 1200 and the width direction member 1300.

[0126] On the other hand, when changing the height of the battery case, it may be unavoidable to change the cross-sectional shape of the longitudinal member 1200 and the widthwise member 1300.

[0127] Therefore, the battery case of the present invention is designed not to consist of a single longitudinal member 1200, a widthwise member 1300, etc., but rather to be divided into multiple components in the height direction and configured to be connected in the height direction, thereby easily accommodating changes in the height of the battery case.

[0128] A battery case according to one embodiment of the present invention may include a side frame 1100, a longitudinal member 1200, and a widthwise member 1300.

[0129] The side frame 1100 can be provided so as to surround the sides. For example, the side frame 1100 can be configured as a rectangular shape with an empty interior on a flat surface, and widthwise members 1300, lengthwise members 1200, cooling panels 1400, etc., can be arranged inside the side frame 1100.

[0130] The longitudinal member 1200 can be formed extending in the longitudinal direction inside the side frame 1100, and can be provided traversing the interior of the side frame 1100. Multiple longitudinal members 1200 can be formed extending in the longitudinal direction and provided spaced apart in the width direction.

[0131] The longitudinal member 1200 is provided inside the side frame 1100, is formed to extend in the longitudinal direction, and can be connected to the side frame 1100 at both ends. For example, the longitudinal member 1200 can support the space between the opposing front frame 1110 and rear frame 1130 of the side frame 1100. For example, two longitudinal members 1200 can be arranged inside the side frame 1100, spaced apart in the width direction.

[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. The upper longitudinal unit 1202 and the lower longitudinal unit 1201, which will be described later, may each have components such as a first upper plate 1210, a first side plate 1230, and a first lower plate 1250.

[0133] The widthwise member 1300 is formed inside the side frame 1100, extending in the width direction, and can be connected to the lengthwise member 1200 so as to intersect with it.

[0134] The widthwise members 1300 are provided inside the side frame 1100, are formed to extend in the width direction, and multiple members can be provided spaced apart in the length direction.

[0135] Multiple widthwise units are connected in the height direction, and a cooling panel 1400 can be installed penetrating between adjacent widthwise units connected in the height direction.

[0136] Each widthwise unit may have components such as a second upper plate 1310, a second side plate 1330, and a second lower plate 1350. The first lower widthwise unit 1301-1, the second lower widthwise unit 1301-2, the upper widthwise unit 1302, etc., described later, may each have components such as a second upper plate 1310, a second side plate 1330, and a second lower plate 1350.

[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 positioned on the lower side.

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

[0140] The upper longitudinal unit 1202 allows the height of the longitudinal member 1200 to be determined according to the height of the first variable unit 1202U to which it is selectively coupled.

[0141] For example, the large battery case 12 can have a tall first-first variable unit 1202U-1 provided above the lower longitudinal unit 1201, while the small battery case 11 can have a shorter first-second variable unit 1202U-2 provided above the lower longitudinal unit 1201.

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

[0143] The battery case of the present invention maintains the basic structure of the battery case by using the same components for the lower longitudinal unit 1201, while minimizing changes in parts to improve production efficiency and allowing for free modification of the battery case size.

[0144] The battery case of the present invention has the effect of easily accommodating changes in the height of the battery case by maintaining the lower longitudinal unit 1201 and selecting the height of the first variable unit 1202U which is coupled to the upper part of the lower longitudinal unit 1201.

[0145] The widthwise member 1300 can connect adjacent longitudinal members 1200, or connect the longitudinal member 1200 to the side frame 1100.

[0146] The widthwise member 1300 can support the space between adjacent longitudinal members 1200, or it can support the space between the longitudinal member 1200 and the side frame 1150 of the side frame 1100.

[0147] Figure 18 is a cross-sectional view showing a widthwise member including an upper widthwise unit 1302 in which multiple second variable units 1302U are alternated, and Figure 19 is a drawing showing an example in which Figure 18 is applied.

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

[0149] The lower widthwise unit 1301 can be positioned on the lower side.

[0150] The upper widthwise unit 1302 includes a plurality of second variable units 1302U having different heights from each other, and at least one of the plurality of second variable units 1302U can be coupled to the upper side of the lower widthwise unit 1301.

[0151] The upper widthwise unit 1302 can determine the height of the widthwise member 1300 according to the height of the second variable unit 1302U to which it is selectively coupled.

[0152] For example, the large battery case 12 can have a tall second-first variable unit 1302U-1 installed above the lower widthwise unit 1301, while the small battery case 11 can have a lower second-second variable unit 1302U-2 installed above the lower widthwise unit 1301.

[0153] As an example, the battery case of the present invention consists of a small battery case 11 and a large battery case 12, where the lower widthwise unit 1301 of the longitudinal member 1200 is made of the same component, and a second variable unit 1302U with a different height can be applied to the upper widthwise unit 1302.

[0154] The battery case of the present invention has the effect of easily accommodating changes in the height of the battery case by maintaining the lower widthwise unit 1301 and selecting the height of the second variable unit 1302U which is coupled to the upper part of the lower widthwise unit 1301.

[0155] The battery case of the present invention can be configured such that the heights of the lower longitudinal unit 1201 and the lower widthwise unit 1301, which are used in common for both the small battery case 11 and the large battery case 12, are corresponding heights. For example, the lower longitudinal unit 1201 and the lower widthwise unit 1301 can have the same height, which has the effect of efficiently handling collision loads on the battery case.

[0156] Figure 20 is a drawing showing one embodiment in which the cross-sectional reinforcing member 1500 of the present invention is provided, and Figure 21 is a drawing showing another embodiment in which the cross-sectional reinforcing member 1500 of the present invention is provided.

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

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

[0159] The cross-sectional reinforcing member 1500 serves to support the space between the two widthwise inner surfaces of the longitudinal member 1200.

[0160] The longitudinal member 1200 is formed to extend in the longitudinal direction and can have a hollow section inside. The longitudinal member 1200 can be advantageous for weight reduction due to the formation of a hollow section, but buckling may occur due to impact loads in the width direction, so the cross-sectional reinforcing member 1500 can reinforce it.

[0161] The upper longitudinal unit 1202 can form a closed cross section when a selected first variable unit 1202U from among a plurality of first variable units 1202U is coupled to the upper side of the lower longitudinal unit 1201.

[0162] The upper longitudinal unit 1202 is composed of a "U-shaped" member with an open lower end, and the open portion can be fitted onto the upper side of the lower longitudinal unit 1201. In this case, an inward-recessed stepped portion 1270 can be formed on the upper side of the lower longitudinal unit 1201 into which the lower part of the upper longitudinal unit 1202 fits. As an example, the lower end of the upper longitudinal unit 1202 is placed on the inward-recessed stepped portion 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 cap-shaped cross-section with an open bottom, and its lower side can be connected 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 a longitudinal member 1200 positioned between adjacent widthwise members 1300 that are spaced apart in the width direction, and supports the space between adjacent widthwise members 1300.

[0165] The reinforcing bulkhead 1501 serves to ensure continuity of the cross-section in the width direction between two width-direction members 1300 that are spaced apart in the width direction. The longitudinal member 1200, which has the reinforcing bulkhead 1501 inside, can be positioned between two width-direction members 1300 that are spaced apart in the width direction.

[0166] The reinforcing bulkhead 1501 and the widthwise member 1300 can be positioned with the first side plate 1230 of the longitudinal member 1200 in between. The reinforcing bulkhead 1501 can be joined to the inner surface of the first side plate 1230 of the longitudinal member 1200, and the widthwise member 1300 can be joined to the inner surface of the first side plate 1230 of the longitudinal member 1200 corresponding to the position where the reinforcing bulkhead 1501 is joined. As an example, the reinforcing bulkhead 1501 can be joined to the inner surface of the first side plate 1230 of the longitudinal member 1200 by welding.

[0167] The left widthwise member 1300, the left first side plate 1230, the reinforcing bulkhead 1501, the right first side plate 1230, and the right widthwise member 1300 can be arranged in the width direction.

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

[0169] As another example, referring to Figure 21, the reinforcing bulkhead 1501 can be joined to the inner surface of the first side plate 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 can be joined to the inner surface of the first side plate 1230 of the lower longitudinal unit 1201 corresponding to the position where the reinforcing bulkhead 1501 is joined.

[0170] The reinforcing bulkhead 1501 and the widthwise member 1300 may have cross-sections of corresponding shapes. The reinforcing bulkhead 1501 and the widthwise member 1300 may be positioned at corresponding locations, sandwiching the first side plate 1230 of the lengthwise member 1200.

[0171] For example, if the widthwise member 1300 has a "U-shaped" cross-section, the reinforcing bulkhead 1501 can have a corresponding "U-shaped" cross-section.

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

[0173] The U-shaped cross-section of the widthwise member 1300 and the U-shaped cross-section of the reinforcing bulkhead 1501 can be positioned in corresponding locations, sandwiching the first side plate 1230 of the lengthwise member 1200. This allows for the maintenance of cross-sectional continuity between the left widthwise member 1300, the left first side plate 1230, the reinforcing bulkhead 1501, the right first side plate 1230, and the right widthwise member 1300, enabling stable resistance to impact loads in the widthwise direction.

[0174] The reinforcing bulkhead 1501 and the widthwise member 1300 may have cross-sections in which at least a portion of the cross-section corresponds to each other.

[0175] For example, if the widthwise member 1300 has a square cross-section that includes a U-shaped cross-section, the reinforcing bulkhead 1501 may have a U-shaped cross-section that corresponds to the U-shaped cross-section of the widthwise member 1300. The U-shaped cross-section of the widthwise member 1300 and the U-shaped cross-section of the reinforcing bulkhead 1501 can be positioned at corresponding locations, sandwiching the first side plate 1230 of the longitudinal member 1200.

[0176] Figure 22 is a drawing showing another embodiment in which the cross-sectional reinforcing member 1500 of the battery case of the present invention is provided.

[0177] The widthwise member 1300 can be connected to the lengthwise member 1200 via the connecting bracket B. The cross-sectional reinforcing member 1500 can be provided inside the lengthwise member 1200, which is positioned between adjacent connecting brackets B spaced apart in the widthwise direction, and can consist of a tubular reinforcing sleeve 1502 that supports the space between adjacent connecting brackets B.

[0178] The reinforcing sleeve 1502 serves to ensure the continuity of the cross-section in the width direction between the two connecting brackets B connected to the width direction member 1300. The longitudinal direction member 1200, which has the reinforcing sleeve 1502 inside, can be positioned between two connecting brackets B that are spaced apart in the width direction.

[0179] The reinforcing sleeve 1502 can support the space between the two widthwise inner surfaces of the longitudinal member 1200. Furthermore, the two connecting brackets B and the longitudinal member 1200 can be fastened together via the reinforcing bolt member 1503. Specifically, the reinforcing bolt member 1503 can 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 connecting bracket B can be joined to the widthwise member 1300 by bolting or welding, and the second bracket B2 of connecting bracket B can be fastened together with the lengthwise member 1200 and the reinforcing sleeve 1502 by the reinforcing bolt member 1503.

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

[0182] The widthwise member 1300 can be connected to multiple widthwise units in the height direction. The cooling panel 1400 is provided between adjacent widthwise units connected in the height direction and can cool the battery module C.

[0183] Figure 23 is a drawing showing a widthwise member 1300 and a cooling panel 1400, in which multiple widthwise units are joined in the height direction; Figure 24 is a cross-sectional view along the line I-I' in Figure 23; and Figure 25 is a cross-sectional view along the line II-II' in Figure 23.

[0184] Figure 26 is a diagram showing a state in which a cooling panel 1400 is installed on the upper side of the first lower widthwise unit 1301-1.

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

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

[0187] The first lower widthwise unit 1301-1 can be connected to the bottom plate 1600 at its lower side, and a cooling panel 1400 and a cooling line 1450 for cooling the cooling panel 1400 can be arranged on the foam beads 1370 formed on its upper side.

[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 plates 1350 may be joined to the bottom plate 1600 by welding. The first lower widthwise unit 1301-1 may have a cap-shaped cross section formed by the second upper plate 1310, the pair of second side plates 1330, and the pair of second lower plates 1350.

[0189] The second lower widthwise unit 1301-2 is positioned above the cooling panel 1400 and can be coupled with the first lower widthwise unit 1301-1.

[0190] Referring to Figure 24, in the area where the cooling panel 1400 is not located, the second lower widthwise unit 1301-2 and the first lower widthwise unit 1301-1 can be joined by a method such as bolting.

[0191] Referring to Figure 25, the second lower widthwise unit 1301-2 is positioned above the first lower widthwise unit 1301-1, with the cooling panel 1400 in between, and the first lower widthwise unit 1301-1, the cooling panel 1400, and the second lower widthwise unit 1301-2 can be connected by bolts 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 can be connected to the second upper plate 1310 of the first lower widthwise unit 1301-1 by a bolted connection or the like. The second lower widthwise unit 1301-2 may have a cap-shaped cross-section formed by the second upper plate 1310, the pair of second side plates 1330, and the pair of second lower plates 1350.

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

[0194] Figure 27 is a detailed drawing showing the portion where the widthwise member 1300 is connected to the lengthwise member 1200.

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

[0196] The upper widthwise unit 1302 is coupled to the upper side of the second lower widthwise unit 1301-2 and includes a plurality of second variable units 1302U having different heights from each other, at least one of the plurality of second variable units 1302U being coupled to the upper side of the lower widthwise unit 1301, and the upper widthwise unit 1302 can be joined to the longitudinal member 1200 via a connecting bracket B.

[0197] Figure 28 is a drawing showing the cooling plate D of a comparative example battery case for comparison with the battery case of the present invention, and Figure 29 is a drawing showing the cooling panel 1400 of a battery case according to one embodiment of the present invention for comparison with the comparative example in Figure 28.

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

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

[0200] The unit space is between two longitudinal members 1200 that are spaced apart in the width direction or in the length direction that are spaced apart in the width direction Component 1200 It can be formed between and the side frame 1100.

[0201] The front frame 1110 of the side frame 1100 can be positioned in front of the unit space, and the front frame 1110 of the side frame 1100 can be positioned in rear.

[0202] On the side of a unit space are two longitudinal directions Component 1200 They are arranged spaced apart in the width direction, or one side of the unit space is spaced apart in the length direction. Component 1200 They are arranged, and the other side of the unit space is in the length direction Component 1200 The side frame 1150 can be positioned at a distance from the width direction.

[0203] In other words, the unit space is the front frame 1110, and a pair of longitudinal directions. Component 1200 , surrounded by the rear frame 1130, or the front frame 1110, in the longitudinal direction Component 1200 It can be enclosed by a side frame 1150 and a rear frame 1130.

[0204] The unit cooling panel 1400M can be provided longitudinally across the interior of the side frame 1100. The unit cooling panel 1400M can be positioned below the battery module C to cool the battery module C. The unit cooling panel 1400M can be supplied with cool air by being connected to a cooling line 1450. The unit cooling panel 1400M can be provided individually in a unit space.

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

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

[0207] When one unit cooling panel 1400M is positioned between two longitudinal members 1200 that are spaced apart in the width direction, and when one unit cooling panel 1400M is positioned between the left side frame 1100 in the width direction and the longitudinal member 1200, the length direction Component 1200 A total of three unit cooling panels 1400M can be provided, with one unit cooling panel 1400M positioned between the right-side frame 1100 in the width direction.

[0208] In this specification, three unit cooling panels 1400M are shown and described, but the invention is not necessarily limited thereto, and two or more unit cooling panels 1400M may be formed.

[0209] If the cooling panel 1400 is installed throughout the entire battery case and the cooling water flows through it, there is a problem in that the cooling passages are long and the cooling temperature loss is large, resulting in a decrease in cooling performance.

[0210] The cooling panel 1400 has the effect of improving cooling performance by preventing the cooling channels from becoming excessively long by individually providing each unit cooling panel 1400M in a unit space, and by reducing the size of the unit cooling panel 1400M, it reduces the springback phenomenon of the unit cooling panel 1400M that may occur during molding of the unit cooling panel 1400M, thereby facilitating the molding and assembly of the unit cooling panel 1400M.

[0211] The unit cooling panel 1400M can consist of a single member that spans the entire length of multiple widthwise members 1300 arranged longitudinally apart inside the side frame 1100.

[0212] Referring to Figure 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 plates D in each area. Furthermore, there is the problem that space must be secured at the upper end of the widthwise member 1300 for the flow paths to pass through in order to connect the tubes, or holes must be made in the widthwise 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, the embodiment, unlike the comparative example, consists of a single member that spans the entirety of multiple widthwise members 1300 arranged longitudinally spaced apart inside the side frame 1100. This eliminates the need to provide multiple cooling plates D divided into a unit space, and eliminates the need for additional tube structures E to connect the flow paths of the cooling plates D in each area. This maximizes battery capacity while providing stable protection from external impacts.

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

[0215] Multiple cooling module plates 1410 are provided spaced apart along the length of the module to cool the battery module C.

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

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

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

[0219] The battery module C can be positioned between two adjacent widthwise members 1300 that are spaced apart in the longitudinal direction.

[0220] The connecting module plate 1430 is provided with a smaller width than the cooling module plate 1410, thereby minimizing the transfer of cold air to the widthwise member 1300 while connecting the two cooling module plates 1410.

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

[0222] As an example, the connecting module plate 1430 can be positioned so as to fit completely between the first lower widthwise unit 1301-1 and the second lower widthwise unit 1301-2.

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

[0224] As an example, the cooling panel 1400 can be provided across four widthwise members 1300 that are spaced apart in the longitudinal direction. The cooling panel 1400 can be configured in a shape in which three cooling module plates 1410 are connected, and the cooling module plates 1410 can be placed between two adjacent widthwise members 1300. However, the cooling panel 1400 is not divided by the widthwise members 1300.

[0225] Although 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 obvious to those with ordinary skill in the art that various modifications and variations are possible without departing from the technical idea of ​​the present invention as described 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 Inward stepped section 300, 1300 Width direction member 301, 1301 Lower width direction unit 301-1, 1301-1 First lower widthwise unit 301-2, 1301-2 Second lower widthwise 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 panels 410, 1410 Cooling Module Board 430, 1430 Linking Module Board 450, 1450 Cooling lines; 500, 1500 Cross-sectional reinforcement members 501, 1501 Reinforced bulkhead; 502, 1502 Reinforced sleeve 503, 1503 Reinforcement bolt members; 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 frame and A longitudinal member is disposed inside the side frame and is formed to extend in the longitudinal direction, A widthwise member including a first lower widthwise unit and a second lower widthwise unit, which are arranged inside the side frame, extending in the width direction and connected to intersect with the longitudinal member, and superimposed in the height direction, A cooling panel positioned above the first lower widthwise unit to cool the battery module Includes a battery case.

2. Side frame and A longitudinal member formed extending in the longitudinal direction inside the side frame, A widthwise member is formed inside the side frame, extending in the width direction, and is connected to the longitudinal member so as to intersect with it. Includes, The longitudinal member is, A lower longitudinal unit positioned on the lower side, An upper longitudinal unit comprising a plurality of first variable units having different heights, wherein at least one of the plurality of first variable units is coupled to the upper side of the lower longitudinal unit. Includes a battery case.

3. The widthwise member is, The battery case according to claim 1 or 2, wherein adjacent longitudinal members are connected, or the longitudinal members are connected to the side frame.

4. A first lower widthwise unit and a second lower widthwise unit are arranged in a superimposed manner in the height direction, A cooling panel positioned above the first lower widthwise unit to cool the battery module The battery case according to claim 2, further comprising:

5. The first lower widthwise unit is positioned below the cooling panel and has foam beads through which the cooling panel passes. The battery case according to claim 1 or 4, wherein the second lower widthwise unit is positioned above the cooling panel and coupled with the first lower widthwise unit.

6. The first lower widthwise unit is The battery case according to claim 5, having a hat-shaped cross-section with an open bottom, and the lower side being connected to a bottom plate to form a closed cross-section together with the bottom plate.

7. The widthwise member is, An upper widthwise unit which is coupled to the upper side of the second lower widthwise unit and joined to the longitudinal member via a connecting bracket. The battery case according to claim 5, further comprising:

8. The longitudinal member is, A lower longitudinal unit having a cap-shaped cross-section with an open bottom, and the lower side being connected to a bottom plate to form a closed cross-section together with the bottom plate, An upper longitudinal unit which is coupled to the upper side of the lower longitudinal unit and together forms a closed cross section, The battery case according to claim 1, including the battery case according to claim 1.

9. A cross-sectional reinforcing member provided inside the longitudinal member, positioned at the connection point where the widthwise member is connected, and supporting the space between the widthwise inner surfaces of the longitudinal member. The battery case according to claim 1 or 2, further comprising:

10. The aforementioned cross-sectional reinforcing member is The battery case according to claim 9, comprising a reinforcing bulkhead provided inside the longitudinal member positioned between adjacent widthwise members spaced apart in the width direction, and supporting the space between adjacent widthwise members.

11. The battery case according to claim 10, wherein the reinforcing bulkhead and the widthwise member have cross-sections in which at least a portion of the cross-sections are corresponding to each other.

12. The widthwise member is connected to the lengthwise member via a connecting bracket. The aforementioned cross-sectional reinforcing member is The battery case according to claim 9, comprising a tubular reinforcing sleeve provided inside the longitudinal member positioned between adjacent connecting brackets spaced apart in the width direction, and supporting the space between adjacent connecting brackets.

13. The aforementioned cooling panel is The battery case according to claim 1 or 4, wherein unit cooling panels are each arranged in a unit space formed between adjacent longitudinal members arranged at a distance from each other in the width direction, or between a longitudinal unit and a side frame arranged at a distance from each other in the width direction.

14. The cooling panel of the aforementioned unit is The battery case according to claim 13, comprising a single member provided across the entirety of a plurality of widthwise members arranged longitudinally spaced apart inside the side frame.

15. The cooling panel of the aforementioned unit is Multiple cooling module plates are provided spaced apart along the length of the battery module, A connecting module plate that connects adjacent cooling module plates and The battery case according to claim 13, including the battery case according to claim 13.

16. The cooling module plate is positioned between adjacent widthwise members that are spaced apart in the longitudinal direction to cool the battery module. The battery case according to claim 15, wherein the connecting module plate is provided with a width smaller than that of the cooling module plate and is arranged between the first lower widthwise unit of the widthwise member and the second lower widthwise unit of the widthwise member.

17. The widthwise member is, A lower width unit positioned on the lower side, The upper widthwise unit includes a plurality of second variable units having different heights, and at least one of the plurality of second variable units is coupled to the upper side of the lower widthwise unit. The battery case according to claim 2, including the battery case according to claim 2.

18. The lower longitudinal unit has a cap-shaped cross-section with an open bottom, and its lower side is connected to the bottom plate to form a closed cross-section together with the bottom plate. The battery case according to claim 2, wherein the upper longitudinal unit has a first variable unit selected from a plurality of first variable units coupled to the upper side of the lower longitudinal unit, forming a closed cross section.

19. The widthwise member is, An upper widthwise unit comprising a plurality of second variable units having different heights and coupled to the upper side of the second lower widthwise unit, wherein at least one of the plurality of second variable units is coupled to the upper side of the lower widthwise unit. It further includes, The battery case according to claim 5, wherein the upper widthwise unit is joined to the longitudinal member via a connecting bracket.

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