Battery case

Abstract

The present invention provides a battery case including: a side wall portion installed to surround the side of an accommodation space; a stacked module that accommodates battery modules and is installed in the accommodation space with multiple modules stacked vertically; a first stacked module that is connected to the side wall portion and installed to block the lower part of the accommodation space; and a second stacked module, at least one of which is arranged above the first stacked module.

Description

[Technical Field]

[0001] The present invention relates to a battery case for an electric vehicle. [Background technology]

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

[0003] As battery-powered electric vehicles become increasingly popular, development and production of vehicles of various sizes is expanding.

[0004] In the case of large electric vehicles with large body sizes, their heavy weight inevitably results in a shorter driving distance compared to the battery capacity, and there is a growing need for large-capacity battery packs to solve this problem.

[0005] Generally, the interior of an electric vehicle battery pack contains numerous lengthwise and widthwise components that serve to protect the battery, making it difficult to fit a large number of batteries inside. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Korean Patent Registration No. 10-1939617 Summary of the Invention [Problem to be solved by the invention]

[0007] SUMMARY OF THE INVENTION One aspect of the present invention is to provide a large-capacity battery case that can secure additional battery mounting space. [Means for solving the problem]

[0008] As one aspect of achieving the above-mentioned object, the present invention provides a battery case including: a side wall portion installed to surround a side surface of an accommodation space; a stacked module that accommodates battery modules and is installed in the accommodation space with a plurality of modules stacked vertically; a first stacked module that is connected to the side wall portion and installed to block a lower portion of the accommodation space; and a second stacked module, at least one of which is arranged above the first stacked module.

[0009] The first stacked module includes a first bottom portion connected to the side wall portion and installed to close a lower portion of the accommodating space; and a plurality of first lower width direction members connected to the first bottom portion, extending widthwise across the accommodating space, and installed spaced apart in a lengthwise direction, and the first lower width direction members may be welded to the first bottom portion.

[0010] The first stacked module may further include a first longitudinal member extending longitudinally across the accommodating space and installed to cover the plurality of first lower width members, and the first longitudinal member may be welded to the first bottom and the plurality of first lower width members.

[0011] The side wall portion may be welded to the first bottom portion, the first lower width direction member, and the first length direction member, respectively.

[0012] The storage battery may further include a first cooling panel portion installed on an upper side of the first lower width direction member to cool the battery module accommodated in the accommodation space.

[0013] The first lower width direction member may include a 1-1 lower width direction member having a first installation groove formed concavely on the upper side for installation of the first cooling panel portion; and a 1-2 lower width direction member arranged between adjacent first lower width direction members in the length direction and having an upper end portion having a height equal to or less than that of a lower end portion of the first cooling panel portion.

[0014] The cooling system may further include a first upper width direction member disposed above the first cooling panel portion and coupled to the first-1 lower width direction member.

[0015] The second stack module may be detachably coupled to the first stack module and the side wall portion.

[0016] The second stack module includes a second bottom portion disposed at a lower portion; and a plurality of second lower width direction members connected to the second bottom portion, extending widthwise across the accommodating space, and spaced apart lengthwise, and the second lower width direction members may be welded to the second bottom portion.

[0017] The first lower width direction member may have a greater height than the second lower width direction member.

[0018] The second lower width direction member, the second bottom portion, and the first stack module may be detachably coupled to each other while overlapping in a height direction.

[0019] The 2-1 lower width direction member of the second lower width direction member may have a plurality of hat-shaped cross sections each having an open bottom, a 2-1 connecting surface between two hat-shaped cross sections, and may be connected by a bolt fastening method in an overlapping state such that the second bottom contacts the underside of the 2-1 connecting surface and the upper side of the first upper width direction member of the first stacked module contacts the underside of the second bottom.

[0020] The second stacked module may further include a second longitudinal member extending longitudinally across the accommodating space and installed to cover the plurality of second lower width members, and the second longitudinal member may be welded to the second bottom and the plurality of second lower width members.

[0021] The storage battery may further include a second cooling panel portion installed on an upper side of the second lower width direction member to cool the battery module accommodated in the accommodation space.

[0022] The second lower width direction member may include a second-1 lower width direction member having a second installation groove formed concavely on the upper side for installation of the second cooling panel unit; and a second-2 lower width direction member arranged between adjacent second-1 lower width direction members in the length direction and having an upper end portion having a height equal to or less than that of a lower end portion of the second cooling panel unit.

[0023] The cooling system may further include a second upper width direction member disposed above the second cooling panel portion and coupled to the 2-1 lower width direction member.

[0024] The stacking device may further include a module bracket connected to the sidewall and detachably connected to the second stacking module to support the second stacking module.

[0025] The module bracket portion may include a module joining plate welded to the side wall portion while overlapping the side wall portion; and a module support plate extending in a direction intersecting the module joining plate and detachably coupled to the second bottom portion of the second stacked module.

[0026] The mounting frame may further include a mounting frame that is connected to the side wall portion and positioned outside the storage space to form a connecting portion with the vehicle body, and the mounting frame may be positioned at a position corresponding to the first stacked module in the height direction.

[0027] The mount frame may be installed over the entire side of the side wall portion so as to surround the side surface thereof. [Effects of the Invention]

[0028] According to an embodiment of the present invention, it is possible to secure additional battery mounting space and configure a large-capacity battery case. [Brief explanation of the drawings]

[0029] [Figure 1]FIG. 2 is an exploded perspective view of a battery case according to an embodiment of the present invention. [Figure 2] 2 is a perspective view of a side wall portion and a mount frame of the battery case of FIG. 1. [Figure 3] FIG. 2 is a perspective view of a first stacked module of the battery case of FIG. [Figure 4] FIG. 4 is a perspective view of the components of FIGS. 2 and 3 combined together. [Figure 5a] FIG. 5 is a cross-sectional view taken along the line II' in FIG. [Figure 5b] FIG. 5 is a cross-sectional view taken along the line II-II' in FIG. [Figure 6] FIG. 5 is a perspective view showing a state in which a first cooling panel portion is further installed in FIG. [Figure 7] FIG. 7 is a perspective view showing a state in which a first upper width direction member is further installed in FIG. 6. [Figure 8a] FIG. 8 is a perspective view showing a state in which a battery module is further installed in FIG. 7. [Figure 8b] FIG. 8B is a diagram showing a detail of part "A" of FIG. 8a. [Figure 9] FIG. 2 is a perspective view of a second stacked module of the battery case of FIG. [Figure 10] FIG. 10 is a perspective view of the components of FIGS. 8a and 9 joined together. [Figure 11] FIG. 11 is a cross-sectional view taken along the line III-III' in FIG. [Figure 12] FIG. 11 is a perspective view showing a state in which a second cooling panel portion is further installed in FIG. [Figure 13] FIG. 13 is a perspective view showing a state in which a second upper width direction member is further installed in FIG. 12. [Figure 14] FIG. 14 is a perspective view showing a state in which a battery module is further installed in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0030] 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 various 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. The shapes and sizes of elements in the drawings may be exaggerated for clarity.

[0031] In the following description, 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.

[0032] As an example, the X-axis, which is the length direction of the battery case, can be the front-to-rear direction, which is the length direction of the vehicle body, and the Y-axis, which is the width direction of the battery case, can be the left-to-right direction, which is the width direction of the vehicle body.

[0033] Hereinafter, components included in the battery case 10 according to an embodiment of the present invention will be described in detail with reference to FIGS.

[0034] FIG. 1 is an exploded perspective view of a battery case 10 according to an embodiment of the present invention, and FIG. 2 is a perspective view of a side wall portion 100 and a mount frame 500 of the battery case 10 of FIG.

[0035] The battery case 10 according to an embodiment of the present invention may include a side wall portion 100 and a stack module N, and the stack module N may include a first stack module N1 and a second stack module N2.

[0036] The side wall portion 100 can be installed so as to surround the side surface of the storage space S.

[0037] The accommodation space S can accommodate a plurality of battery modules M. The battery module M can include a plurality of battery cells M1.

[0038] The sidewall 100 may include a side panel 110 and a bottom flange 150 .

[0039] The side panel 110 may be installed to close the side of the storage space S. The side panel 110 may be composed of a plate-shaped member extending in the vertical direction, and may be installed to surround the side of the storage space S.

[0040] The lower flange 150 may be connected to the lower region of the side panel 110 and form a coupling portion with the first bottom portion 200-1 of the first stack module N1. The lower flange 150 may be coupled to the first bottom portion 200-1 in an overlapping state. The lower flange 150 may be formed as a plate-shaped member extending in the horizontal direction. As an example, the lower flange 150 may be formed as a square ring-shaped member installed across the entire lower region of the side panel 110.

[0041] The sidewall 100 may further include an upper flange 130 .

[0042] The upper flange 130 is connected to the upper region of the side panel 110 and can form a joint with the floor C1 of the vehicle body or the upper cover (not shown) of the battery case 10.

[0043] The side wall portion 100 has a first side wall 100a and a second side wall 100b arranged opposite each other in the width direction Y across the storage space S, and the first lower width direction member 300-1 can be installed across between the first side wall 100a and the second side wall 100b.

[0044] One end of the first lower width direction member 300-1 in the width direction Y may be disposed to contact the first side wall 100a, and the other end of the first lower width direction member 300-1 in the width direction Y may be disposed to contact the second side wall 100b. Both ends of the first lower width direction member 300-1 in the width direction Y may be welded to the first side wall 100a and the second side wall 100b, respectively. A lower portion of the first lower width direction member 300-1 may be welded to the first bottom 200-1.

[0045] The first lower width direction member 300-1 may be installed to connect the first side wall 100a and the second side wall 100b. This allows the first lower width direction member 300-1 to support a load transmitted in the width direction Y between the first side wall 100a and the second side wall 100b. The first lower width direction member 300-1 may stably support a load in the width direction Y transmitted from the mount frame 500 or the like.

[0046] The stacked module N accommodates the battery modules M, and a plurality of the stacked modules N can be installed in the accommodation space S in a stacked manner in the height direction Z.

[0047] A plurality of stacked modules N are stacked and installed in the height direction Z, so that a greater number of battery modules M can be accommodated in the accommodation space S. The battery module M can include a plurality of battery cells M1.

[0048] The accommodation space S may accommodate a plurality of battery modules M in the length direction X or the width direction Y. For example, the accommodation space S may accommodate a plurality of battery modules M in each of the length direction X, the width direction Y, and the height direction Z.

[0049] The first stacked module N1 may be connected to the side wall 100 and installed to close the lower portion of the accommodation space S. At least one second stacked module N2 may be disposed above the first stacked module N1.

[0050] FIG. 3 is a perspective view of the first stacked module N1 of the battery case 10 of FIG. 1, and FIG. 4 is a perspective view of the components of FIG. 2 and FIG. 3 combined together.

[0051] 5a is a cross-sectional view taken along line II' in FIG. 4, and FIG. 5b is a cross-sectional view taken along line II-II' in FIG.

[0052] The first stacked module N1 may include a first bottom portion 200-1 and a first lower width direction member 300-1.

[0053] The first bottom 200-1 may be connected to the side wall 100 and installed to close a lower portion of the accommodating space S. As an example, the first bottom 200-1 may be made of a metal plate such as a steel plate. The side wall 100 may close a side surface of the accommodating space S, and the first bottom 200-1 may close a lower surface of the accommodating space S, with an upper portion of the accommodating space S of the battery case 10 being open.

[0054] For example, the side wall portion 100 and the first bottom portion 200-1 may be made of a metal material such as steel, and the side wall portion 100 and the first bottom portion 200-1 may be joined by welding.

[0055] The first bottom portion 200-1 and the side wall portion 100 may be fabricated separately and then joined together. If the first bottom portion 200-1 and the side wall portion 100 are fabricated separately, there may be an overlapping portion where the first bottom portion 200-1 and the side wall portion 100 overlap each other. As an example, the overlapping portion must be watertight, so it may be completely sealed by arc welding. As another example, the overlapping portion may be sealed by a sealing process, and the assembly strength may be ensured by spot welding.

[0056] The first lower width direction member 300-1 is connected to the first bottom portion 200-1 and extends in the width direction Y across the receiving space S. A plurality of first lower width direction members 300-1 may be installed spaced apart in the length direction X. The first lower width direction member 300-1 may be welded to the first bottom portion 200-1.

[0057] The first lower width direction member 300-1 has a hat-shaped cross section with an open bottom, and the lower side thereof is connected to the first bottom portion 200-1 to form a closed cross section together with the first bottom portion 200-1.

[0058] The first lower width direction member 300-1 is disposed at a position corresponding to the mount frame 500 across the side wall 100, and can support a load transmitted from the mount frame 500. That is, the first lower width direction member 300-1 can form a load transmission path in the width direction Y together with the mount frame 500.

[0059] The first stacked module N1 may further include a first longitudinal member 400-1.

[0060] The first lengthwise member 400-1 may be formed to extend in the lengthwise direction X across the receiving space S and may be installed to cover the plurality of first lower widthwise members 300-1. The first lengthwise member 400-1 may be welded to the first bottom 200-1 and the plurality of first lower widthwise members 300-1.

[0061] The first lengthwise member 400-1 may connect a plurality of first lower widthwise members 300-1 spaced apart in the lengthwise direction X. The first lengthwise member 400-1 may be connected to the first lower widthwise members 300-1 so as to intersect with each other.

[0062] The first lengthwise member 400-1 may be welded to each of the plurality of first lower widthwise members 300-1. The first lengthwise member 400-1 may be welded to the first bottom 200-1. The first lengthwise member 400-1 may be welded to each of the first bottom 200-1 and the plurality of first lower widthwise members 300-1.

[0063] The first longitudinal member 400-1 may be installed across the front wall 100c and the rear wall 100d of the side wall portion 100. One end of the first longitudinal member 400-1 in the length direction X is arranged to contact the front wall 100c, and the other end of the first longitudinal member 400-1 in the length direction X is arranged to contact the rear wall 100d, so that the first longitudinal member 400-1 may be installed to connect between the front wall 100c and the rear wall 100d.

[0064] The side wall portion 100, the first bottom portion 200-1, the first lower width direction member 300-1, and the first length direction member 400-1 may be made of a metal material such as steel.

[0065] The first lower width direction member 300-1 may ensure continuity of the cross section in the width direction Y. Specifically, the first lower width direction member 300-1 may have a constant cross section in the width direction Y. However, although the cross section of the first lower width direction member 300-1 may vary partially in a first installation groove 310-1 (described later), the remaining section may maintain a constant cross section between the first side wall 100a and the second side wall 100b, thereby ensuring continuity of the cross section.

[0066] The first longitudinal member 400-1 is installed to cover a plurality of first lower widthwise members 300-1, and the first lower widthwise members 300-1 ensure cross-sectional continuity in the width direction Y, thereby stably supporting the load applied in the width direction Y and increasing the structural rigidity of the lower part of the battery case 10.

[0067] The first longitudinal member 400-1 may include a first longitudinal body 410-1 and a first lower insertion groove 430-1.

[0068] The first longitudinal body 410-1 may be formed to extend in the longitudinal direction X and installed to cover the upper portions of the plurality of first lower width direction members 300-1.

[0069] The first longitudinal body 410-1 has a hat-shaped cross section with an open bottom, and a lower side of the first longitudinal body 410-1 may be connected to the first bottom 200-1 to form a closed cross section together with the first bottom 200-1 in a portion where the first lower widthwise member 300-1 is not installed. For example, the lower side of the first longitudinal body 410-1 may be welded to the first bottom 200-1.

[0070] The first longitudinal body 410-1 may be welded to the first bottom portion 200-1 and the plurality of first lower widthwise members 300-1, respectively.

[0071] The first lower insertion groove 430-1 is formed in a concave shape from the lower side to the upper side of the first lengthwise body 410-1, and the first lower widthwise member 300-1 can be inserted therein.

[0072] The first lower insertion groove 430-1 may be configured to have a shape corresponding to the outer surface of the first lower width direction member 300-1. When the first lower width direction member 300-1 is inserted into the first lower insertion groove 430-1, the first lower width direction member 300-1 may contact the first bottom portion 200-1 at its lower side and the upper side may contact the upper side of the first lower insertion groove 430-1.

[0073] Of course, the first lower insertion groove 430-1 and the first lower width direction member 300-1 may not be in contact with each other in some sections.

[0074] The first lengthwise member 400-1 may be welded to the first bottom portion 200-1 at its lower side and welded to the first lower widthwise member 300-1 around the first lower insertion groove 430-1. The first lower widthwise member 300-1 may be inserted into the first lower insertion groove 430-1, and the first lengthwise member 400-1 and the widthwise member may be welded to each other with the first lower widthwise member 300-1 in close contact with the first lower insertion groove 430-1.

[0075] The side wall portion 100 may be welded to the first bottom portion 200-1, the plurality of first lower width direction members 300-1, and the first length direction members 400-1, respectively.

[0076] The side wall portion 100 may be welded to the first bottom portion 200-1 along the entire periphery. The side wall portion 100 may be welded to both ends of the first lower width direction member 300-1 in the width direction Y. The side wall portion 100 may be welded to both ends of the first length direction member 400-1 in the length direction X.

[0077] As a result, the side wall portion 100 is welded to the first bottom portion 200-1, the plurality of first lower width direction members 300-1, and the first length direction members 400-1, respectively, to support the skeleton at the lower part of the battery case 10, thereby increasing the structural rigidity of the lower part of the battery case 10 and suppressing overall deformation of the battery case 10.

[0078] The upper side of the side wall portion 100 is coupled to the floor C1 of the vehicle body or an upper cover (not shown) of the battery case 10, thereby closing the upper part of the accommodation space S.

[0079] As an example, the upper side of the side wall portion 100 is connected to the floor C1 of the vehicle body, thereby closing the upper part of the storage space S. The floor C1 of the vehicle body serves as the upper lid of the battery case 10, so that a portion of the battery case 10 corresponding to the upper lid can be omitted, which has the effect of achieving a lighter vehicle weight.

[0080] The battery case 10 may further include a seal portion 800. The seal portion 800 may be disposed between the upper flange 130 and the floor C1 to ensure that the accommodation space S is watertight.

[0081] As another example, the upper side of the side wall 100 may be coupled to an upper cover (not shown) of the battery case 10 .

[0082] The battery case 10 may further include a mounting frame 500.

[0083] The mount frame 500 may be coupled to the side wall 100 and disposed outside the receiving space S to form a coupling portion with the vehicle body. The mount frame 500 may be coupled to an outer surface of the side wall 100.

[0084] The mount frame 500 may be disposed at a position corresponding to the first stacked module N1 in the height direction Z. Specifically, the mount frame 500 may be disposed at a portion corresponding to the first lower width direction member 300-1 of the first stacked module N1 in the height direction Z.

[0085] The mount frame 500 may serve to assemble the battery case 10 to the vehicle body and maintain assembly rigidity and strength. For example, the mount frame 500 may be joined to the side wall 100 by welding.

[0086] A body frame C2 is coupled to the underside of the floor C1 of the vehicle body, and the body frame C2 may be coupled to the mount frame 500. For example, the mount frame 500 and the body frame C2 may be detachably coupled to each other by a bolt fastening method.

[0087] In the event of a side collision in the width direction Y of the vehicle body, both the mount frame 500 and the vehicle body frame C2 can ultimately play a role in protecting the battery case 10.

[0088] The mount frame 500, the side wall 100, and the first lower width direction member 300-1 may be arranged in this order in the width direction Y. The side wall 100 is arranged behind the mount frame 500, and the first lower width direction member 300-1 is arranged behind the side wall 100, so that the mount frame 500 can be stably supported by the side wall 100 and the first lower width direction member 300-1 during a side collision of the vehicle body.

[0089] The mechanical fastening unit 900 may detachably connect the mount frame 500, the side wall 100, and the floor C1. The mechanical fastening unit 900 may be detachably fastened by a bolt or the like. A plurality of the mechanical fastening units 900 may be installed at predetermined intervals.

[0090] The mechanical fastener 900 may include a sleeve member 910 and a long bolt member 930 .

[0091] The sleeve member 910 may be formed to extend vertically in the height direction Z to provide support between the upper flange 130 and the mount frame 500. The upper end of the sleeve member 910 may contact the upper flange 130 of the side wall portion 100, and the lower end of the sleeve member 910 may contact the mount frame 500. The sleeve member 910 is formed as a cylindrical member, and the long bolt member 930 may be installed to pass through it.

[0092] The long bolt member 930 is installed through the sleeve member 910 and can detachably fasten the floor C1, the upper flange 130 and the mount frame 500.

[0093] The long bolt member 930 can be inserted from the bottom to the top of the mount frame 500 and coupled to it. The long bolt member 930 can be fastened to a nut member joined to the top surface of the floor C1 to fix the floor C1, the upper flange 130, and the mount frame 500 together.

[0094] The upper end of the sleeve member 910 may be arranged to contact the lower surface of the upper flange 130 , and the lower end of the sleeve member 910 may be arranged to contact the upper surface of the lower plate 530 of the mount frame 500 .

[0095] The mount frame 500 may be installed over the entire side of the side wall portion 100 so as to surround the side surface of the side wall portion 100. The mount frame 500 may be coupled to the outer side of the side surface of the side wall portion 100.

[0096] The mount frame 500 is configured as a member having a substantially square ring shape on a plane, and the side wall portion 100 is seated inside the square ring shape, and the mount frame 500 and the side wall portion 100 can be joined by welding or the like.

[0097] As an example, the mount frame 500 may be coupled to the side wall portion 100 and the first bottom portion 200-1 by welding, etc. As another example, the mount frame 500 may be coupled to the side wall portion 100 by welding, etc.

[0098] The mount frame 500 may be disposed at a position corresponding to the first lower width direction member 300-1 across the side wall portion 100. The mount frame 500 may be disposed at a position corresponding to the first length direction member 400-1 across the side wall portion 100.

[0099] The mount frame 500 has an opening 570 that is open on one side, and may be coupled to the side wall 100 to close the opening 570, thereby forming a closed cross-sectional portion D. The closed cross-sectional portion D may be disposed at a height corresponding to the first lower width direction member 300-1 in the height direction Z.

[0100] The mounting frame 500 may include a top plate 510 , a bottom plate 530 , side plates 550 , and an opening 570 .

[0101] The upper plate 510 may be formed to extend laterally and be joined to the side wall 100. One side of the upper plate 510 may be connected to the upper side of the side plate 550, and the other side of the upper plate 510 may be joined to the side panel 110 of the side wall 100. The upper plate 510 may be formed with a joining flange disposed to be in contact with the side panel 110, and the joining flange may be joined to the side panel 110 in a state where it overlaps with the thickness direction, thereby further ensuring joining strength.

[0102] The lower plate 530 may be formed to extend in the horizontal direction and may be disposed vertically spaced apart from the upper plate 510. One side of the lower plate 530 may be connected to the underside of the side plate 550, and the other side of the lower plate 530 may be coupled to the first bottom portion 200-1 or the side panel 110 of the side wall portion 100.

[0103] The side plate 550 may be formed to extend vertically to connect one side of the upper plate 510 and one side of the lower plate 530. The side plate 550 may be disposed spaced apart from the side panel 110 of the side wall portion 100 in the horizontal direction by a predetermined distance.

[0104] The opening 570 is an open portion between the other side of the upper plate 510 and the other side of the lower plate 530. When the mount frame 500 is coupled to the side wall 100, the opening 570 is closed by the side wall 100, thereby forming a closed cross-sectional portion D.

[0105] The lower plate 530 has a longer horizontal extension than the upper plate 510 and can be coupled to the first bottom part 200-1.

[0106] The lower plate 530 may be formed to extend laterally to the first bottom portion 200-1 and may be joined to the first bottom portion 200-1 by welding or the like. When the upper plate 510 is joined to the side panel 110 of the side wall portion 100, the lower plate 530 may be formed to extend to the first bottom portion 200-1, passing under the side panel 110. For example, the first bottom portion 200-1, the lower flange 150 of the side wall portion 100, and the lower plate 530 may be joined by welding or the like while overlapping each other in the thickness direction.

[0107] FIG. 6 is a perspective view showing a state in which a first cooling panel unit 600-1 is further installed in addition to the configuration of FIG.

[0108] The battery case 10 may further include a first cooling panel unit 600-1.

[0109] The first cooling panel unit 600-1 is installed on the upper side of the first lower width direction member 300-1 and can cool the battery modules M accommodated in the accommodation space S. The upper battery modules M can be arranged on the first cooling panel unit 600-1.

[0110] The first cooling panel unit 600-1 may be composed of a plurality of unit cooling panels 600M spaced apart in the width direction Y. As an example, the first cooling panel unit 600-1 may be composed of two unit cooling panels 600M, and the accommodation space S may be divided into two cooling spaces S1.

[0111] If the first cooling panel unit 600-1 is installed over the entire battery case 10 and 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.

[0112] The first cooling panel part 600-1 has the effect of individually installing the unit cooling panels 600M in the cooling space S1, which is part of the accommodation space S, thereby preventing the cooling flow path from becoming excessively long and improving cooling performance, and reducing the size of the unit cooling panels 600M, thereby reducing the springback phenomenon of the unit cooling panels 600M that may occur during molding of the unit cooling panels 600M, making it easier to mold and assemble the unit cooling panels 600M.

[0113] The unit cooling panel 600M may be disposed between the side wall 100 and the first lengthwise member 400-1 in the width direction Y. The unit cooling panel 600M may be formed of a single member installed across the entirety of a plurality of widthwise members spaced apart in the length direction X in the receiving space S.

[0114] In this specification, two unit cooling panels 600M are illustrated and described as being installed, but this is not necessarily limited to this, and one or three or more unit cooling panels 600M may be formed.

[0115] The first lower width direction member 300-1 may include a first-first lower width direction member 300-1a and a first-second lower width direction member 300-1b.

[0116] The first-1 lower width direction member 300-1a may have a first installation groove 310-1 formed in a concave shape on the upper side for installing the first cooling panel unit 600-1. The first installation groove 310-1 may serve to secure a space in which the cooling flow path of the first cooling panel unit 600-1 is formed.

[0117] The first-second lower width direction member 300-1b may be disposed between the first-first lower width direction members 300-1a adjacent to each other in the longitudinal direction X. A plurality of first-second lower width direction members 300-1b may be disposed between two adjacent first-first lower width direction members 300-1a at intervals in the longitudinal direction X. For example, two first-second lower width direction members 300-1b may be disposed between two adjacent first-first lower width direction members 300-1a.

[0118] The upper end portion of the first-second lower width direction member 300-1b may have a height equal to or less than that of the lower end portion of the first cooling panel unit 600-1. In other words, the first-second lower width direction member 300-1b may not interfere with the first cooling panel unit 600-1.

[0119] Therefore, since the first-2 lower width direction member 300-1b does not interfere with the first cooling panel portion 600-1, the first-2 lower width direction member 300-1b can be installed below the first cooling panel portion 600-1, which has the effect of ensuring sufficient rigidity of the lower portion of the battery case 10.

[0120] The first and second lower width direction members may be welded to the first side wall 100a and the second side wall 100b at both ends in the width direction Y. The first and second lower width direction members may be welded to the first bottom portion 200-1 at their lower ends.

[0121] Figure 7 is an oblique view showing the state in which a first upper width direction member 700-1 is further installed in Figure 6, Figure 8a is an oblique view showing the state in which a battery module M is further installed in Figure 7, and Figure 8b is a diagram showing details of part "A" in Figure 8a.

[0122] The battery case 10 may further include a first upper width direction member 700-1.

[0123] The first upper width direction member 700-1 may be disposed above the first cooling panel unit 600-1 and may be coupled to the first-1 lower width direction member 300-1a.

[0124] The first upper width direction member 700-1 is formed to extend in the width direction Y and can connect the side wall portion 100 and the first length direction member 400-1. Of course, although not shown, when a plurality of first length direction members 400-1 are arranged spaced apart in the width direction Y, the first upper width direction member 700-1 can connect the side wall portion 100 and the first length direction member 400-1 or connect adjacent first length direction members 400-1.

[0125] The first upper width direction member 700-1 is coupled to the upper side of the first-first lower width direction member 300-1a and can form a closed cross-sectional portion together with the first-first lower width direction member 300-1a.

[0126] The first upper width direction member 700-1 may be detachably coupled to the first lower width direction member 300-1a by bolt fastening or the like.

[0127] Since the first cooling panel unit 600-1 is disposed above the first-second lower width direction member 300-1b, the first upper width direction member 700-1 does not need to be disposed above the first-second lower width direction member 300-1b.

[0128] Since the first upper width direction member 700-1 is installed above the first-1 lower width direction member 300-1a but not above the first-2 lower width direction member 300-1b, the battery modules M can be assembled and accommodated in the compartment spaces S2 divided by the first length direction member 400-1 and the first upper width direction member 700-1 above the first cooling panel unit 600-1. For example, the accommodation space S can be divided into four compartment spaces S2, and four battery modules M can be accommodated in each compartment space S2.

[0129] First and second lower width direction members may be installed at the lower part of the battery case 10 in the height direction Z, and a first upper width direction member 700-1 may be installed above the lower part of the battery case 10 in the height direction Z.

[0130] The first and second lower width direction members, the side wall 100, the mount frame 500, etc. increase the structural rigidity of the lower part of the battery case 10 to form a strong support structure, thereby reducing the number of first upper width direction members 700-1 that cross the storage space S above the lower part of the battery case 10. Therefore, by securing additional space above the lower part of the battery case 10 in which battery modules M can be installed, more battery modules M can be installed, which is advantageous in that a battery case 10 with a large capacity can be configured.

[0131] Specifically, the installation area where the first and second lower width direction members are installed relative to the entire area of ​​the first bottom portion 200-1 on a plane can be defined as the first installation area, and the installation area where the first upper width direction member 700-1 is installed relative to the entire area of ​​the first bottom portion 200-1 on a plane can be defined as the second installation area.

[0132] Since the first upper width direction member 700-1 is installed above the 1-1 lower width direction member 300-1a and not above the 1-2 lower width direction member 300-1b, the second installation area can have a larger space than the first installation area, and more battery modules M can be installed, thereby forming a large-capacity battery case 10.

[0133] As described above, when the vehicle floor C1 is coupled to the upper side of the side wall 100, the structural rigidity of the upper part of the battery case 10 can be increased. In this case, by increasing both the structural rigidity of the upper part and the structural rigidity of the lower part of the battery case 10, a stronger support structure can be formed. The first upper width direction member 700-1 that crosses the storage space S above the lower part of the battery case 10 can be further reduced, which has the effect of enabling the battery case 10 to have a larger capacity.

[0134] The battery case 10 may further include a module bracket portion L.

[0135] The module bracket L is connected to the sidewall 100 and can be detachably connected to the second stacked module N2 to support the second stacked module N2. Specifically, the module bracket L can support the second bottom portion 200-2 of the second stacked module N2. The module bracket L can be welded to the sidewall 100 and detachably coupled to the second bottom portion 200-2 by a bolt fastening method or the like.

[0136] For example, the module bracket portion L may be installed on the first side wall 100a and the second side wall 100b, respectively.

[0137] The module bracket portion L may include a module joining plate La and a module support plate Lb.

[0138] The module joining plate La may be welded to the side wall portion 100 while overlapping the side wall portion 100. The module joining plate La may be formed to extend in the length direction X and may be welded to the side wall portion 100.

[0139] The module support plate Lb is formed to extend in a direction intersecting the module joining plate La and can be detachably coupled to the second bottom portion 200-2 of the second stacked module N2. The module support plate Lb is installed to protrude in the width direction Y from the side wall portion 100 toward the accommodation space S and can support the underside of the second bottom portion 200-2.

[0140] The module support plate Lb may have a separation groove Lc recessed toward the side wall portion 100. The recessed separation groove Lc allows the first upper width direction member 700-1 of the first stacked module N1 and the like to be assembled and disassembled without interfering with the module support plate Lb.

[0141] 9 is a perspective view of the second stack module N2 of the battery case 10 of FIG. 1, FIG. 10 is a perspective view of the components of FIG. 8a and FIG. 9 combined, and FIG. 11 is a cross-sectional view in the III-III' direction of FIG. 10.

[0142] The second stack module N2 may be designed substantially similarly to the first stack module N1. For example, the second stack module N2 may include a second bottom portion 200-2, a second lower width direction member 300-2, a second length direction member 400-2, a second upper width direction member 700-2, etc., which may correspond to the first bottom portion 200-1, the first lower width direction member 300-1, the first length direction member 400-1, and the second upper width direction member 700-2, etc., of the first stack module N1.

[0143] The second stacked module N2 may be detachably fastened to the first stacked module N1 and the side wall portion 100 by a bolt fastening method or the like so that it can be assembled and disassembled. In contrast, the first stacked module N1 is joined to the side wall portion 100 by welding or the like, and some components cannot be assembled or disassembled.

[0144] Specifically, the second stacked module N2 does not need to have the second bottom 200-2, the second lower width direction member 300-2, and the second length direction member 400-2 welded to the sidewall 100. In contrast, the first stacked module N1 differs in that the first bottom 200-1, the first lower width direction member 300-1, and the first length direction member 400-1 are welded to the sidewall 100.

[0145] Furthermore, it goes without saying that the second stacked module N2 has a second longitudinal member 400-2 and a second lower width member 300-2 that are slightly different from the first lower width member 300-1 and the first longitudinal member 400-1 of the first stacked module N1 in terms of installation length, height, and other specifications.

[0146] It goes without saying that the second stacked module N2 can be configured in the same manner as the first stacked module N1 except for differences in the components. For example, the first upper width direction member 700-1 and the second upper width direction member 700-2 may be the same member.

[0147] Therefore, in the description of the components of the second stacked module N2, the description of the components corresponding to the components of the first stacked module N1 will be omitted to avoid duplication.

[0148] The second stacked module N2 can be detachably coupled to the first stacked module N1 and the side wall portion 100.

[0149] The second stacked module N2 may be disposed above the first stacked module N1 and detachably coupled to the first stacked module N1 by a bolt fastening method or the like. The second stacked module N2 may be detachably coupled to the side wall 100 via a module bracket L by a bolt fastening method or the like. In this case, the module bracket L may be welded to the side wall 100.

[0150] The second stacked module N2 may include a second bottom portion 200-2 and a second lower width direction member 300-2.

[0151] The second bottom portion 200-2 may be disposed at the bottom. The second bottom portion 200-2 may be installed on the upper side of the first stack module N1. The second bottom portion 200-2 does not have to be welded to the side wall portion 100.

[0152] The second lower width direction member 300-2 is connected to the second bottom portion 200-2 and extends in the width direction Y across the receiving space S. A plurality of second lower width direction members 300-2 may be installed spaced apart in the length direction X. The second lower width direction member 300-2 may be welded to the second bottom portion 200-2.

[0153] The second lower width direction member 300-2 may have a width shorter than that of the first lower width direction member 300-1 in the width direction Y. For example, the second lower width direction member 300-2 may not be coupled to the side wall portion 100.

[0154] The second lower width direction member 300-2 has a hat-shaped cross section with an open bottom, and the lower side thereof is connected to the second bottom portion 200-2 to form a closed cross section together with the second bottom portion 200-2.

[0155] The first lower width direction member 300-1 may have a greater height than the second lower width direction member 300-2.

[0156] This is because when the first stacked module N1 is disposed below the battery case 10 and an impact is applied to the first bottom portion 200-1 of the first stacked module N1 from below, the first bottom portion 200-1 may be deformed by the impact applied to the first bottom portion 200-1. If the first bottom portion 200-1 is deformed and penetrates into the battery module M above, the battery module M may be damaged. To prevent this, the first lower width direction member 300-1 has a sufficient height to ensure a buffer space.

[0157] The second lower width direction member 300-2 can have a lower height than the first lower width direction member 300-1. Because the second stacked module N2 is disposed above the first stacked module N1 in the battery case 10, there is little possibility that the second bottom 200-2, etc. will be deformed by an impact from below. Therefore, by lowering the height of the second lower width direction member 300-2 and the second stacked module N2, the storage space S can be further secured, and the capacity of the battery case 10 can be further secured.

[0158] Unlike the first stacked module N1, the second stacked module N2 does not have the second bottom 200-2 welded to the side wall portion 100, but is fastened to the module bracket portion L by a bolt fastening method or the like, and therefore requires reinforcement of structural rigidity.

[0159] Therefore, the second lower width direction member 300-2, the second bottom portion 200-2, and the first stacked module N1 are detachably fastened together in a state of being overlapped in the height direction Z, thereby enhancing structural rigidity.

[0160] Specifically, the second-1 lower width direction member 300-2a of the second stacked module N2, the second bottom 200-2 of the second stacked module N2, and the first upper width direction member 700-1 of the first stacked module N1 can be detachably fastened using a bolt fastening method while overlapping in the height direction Z.

[0161] The second bottom portion 200-2 and the second-first lower width direction member 300-2a are welded together, and the second-first lower width direction member 300-2a, the second bottom portion 200-2, and the first upper width direction member 700-1 may be further fastened together by a bolt fastening method.

[0162] A first upper width direction member 700-1, a second bottom portion 200-2, and a second-1 lower width direction member 300-2a may be arranged in the height direction Z from the bottom.

[0163] Although not shown, a plurality of second stack modules N2 may be installed in the height direction Z above the first stack module N1. Two second stack modules N2 stacked and connected in the height direction Z may also be connected to each other. Specifically, the second upper width direction member 700-2 of the second stack module N2 disposed on the lower side, the second bottom portion 200-2 of the second stack module N2 disposed on the upper side, and the second-1 lower width direction member 300-2a of the second stack module N2 disposed on the upper side may be connected by a bolt fastening method while being arranged in the height direction Z.

[0164] The second-1 lower width direction member 300-2a may have a plurality of hat-shaped cross sections with open bottoms, and a second-1 connecting surface 300-2a-1 may be formed between two hat-shaped cross sections. The second bottom portion 200-2 may be in contact with the underside of the second-1 connecting surface 300-2a-1, and the second upper width direction member 700-2 may be connected to the underside of the second bottom portion 200-2 by a bolt fastening method in an overlapping state.

[0165] The 2-1 lower width direction member 300-2a has a plurality of continuous hat-shaped cross sections with an open bottom, which can reinforce the cross-sectional rigidity and can be firmly coupled to the first stacked module N1.

[0166] The second stacked module N2 may further include a second longitudinal member 400-2.

[0167] The second lengthwise member 400-2 may be formed to extend in the lengthwise direction X across the receiving space S and may be installed to cover the plurality of second lower widthwise members 300-2. The second lengthwise member 400-2 may be welded to the second bottom 200-2 and the plurality of second lower widthwise members 300-2.

[0168] The second longitudinal member 400-2 does not have to be welded to the side wall 100, but may be detachably connected to the side wall 100 via a connecting bracket (not shown). The connecting bracket (not shown) may be connected to the side wall 100 and the second longitudinal member 400-2 by a bolt fastening method or the like. The second longitudinal member 400-2 may have a shorter length in the longitudinal direction X than the first longitudinal member 400-1.

[0169] The second longitudinal member 400-2 may include a second longitudinal body 410-2 and a second lower insertion groove 430-2.

[0170] The second longitudinal body 410-2 may be formed to extend in the longitudinal direction X and installed to cover the upper portions of the plurality of second lower width direction members 300-2.

[0171] The second lower insertion groove 430-2 is formed in a concave shape from the lower side to the upper side of the second lengthwise body 410-2, and the second lower widthwise member 300-2 can be inserted therein.

[0172] The second lengthwise member 400-2 may be welded to the second bottom portion 200-2 at its lower side and welded to the second lower widthwise member 300-2 around the second lower insertion groove 430-2.

[0173] FIG. 12 is a perspective view showing a state in which a second cooling panel unit 600-2 is further installed in the configuration of FIG.

[0174] The battery case 10 may further include a second cooling panel unit 600-2.

[0175] The second cooling panel portion 600-2 is installed above the second lower width direction member 300-2 and is capable of cooling the battery module M accommodated in the accommodation space S.

[0176] The second cooling panel unit 600-2 may be composed of a plurality of unit cooling panels 600M spaced apart in the width direction Y. As an example, the second cooling panel unit 600-2 may be composed of two unit cooling panels 600M, and the accommodation space S may be divided into two cooling spaces S1.

[0177] The second lower width direction member 300-2 may include a second-first lower width direction member 300-2a and a second-second lower width direction member 300-2b.

[0178] The second-1 lower width direction member 300-2a may have a second installation groove 310-2 formed in a concave shape on the upper side for installing the second cooling panel unit 600-2. The second installation groove 310-2 may serve to secure a space in which the cooling flow path of the second cooling panel unit 600-2 is formed.

[0179] The second-second lower width direction member 300-2b may be disposed between the second-first lower width direction members 300-2a adjacent to each other in the longitudinal direction X. A plurality of second-second lower width direction members 300-2b may be disposed between two adjacent second-first lower width direction members 300-2a at intervals in the longitudinal direction X. For example, two second-second lower width direction members 300-2b may be disposed between two adjacent second-first lower width direction members 300-2a.

[0180] The upper end portion of the second-second lower width direction member 300-2b may have a height equal to or less than that of the lower end portion of the first cooling panel unit 600-1. In other words, the first-second lower width direction member 300-1b may not interfere with the first cooling panel unit 600-1.

[0181] 13 is a perspective view showing a state in which a second upper width direction member 700-2 is further installed in FIG. 12, and FIG. 14 is a perspective view showing a state in which a battery module M is further installed in FIG.

[0182] The battery case 10 may further include a second upper width direction member 700-2.

[0183] The second upper width direction member 700-2 may be disposed above the second cooling panel unit 600-2 and may be coupled to the second-1 lower width direction member 300-2a.

[0184] The second upper width direction member 700-2 is formed to extend in the width direction Y and may connect the side wall 100 and the second length direction member 400-2. One end of the second upper width direction member 700-2 in the width direction Y may be connected to the side wall 100 via a connecting bracket E by a bolt fastening method, and the other end of the second upper width direction member 700-2 in the width direction Y may be connected to the second length direction member 400-2 by a bolt fastening method via a connecting bracket E.

[0185] In the battery case 10 of the present invention, by applying the same components as the first and second upper width direction members, common parts can be utilized and production efficiency can be improved.

[0186] 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 obvious 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 described in the claims. [Explanation of symbols]

[0187] 10 Battery case 100 Side wall 100a First side wall 100b 2nd side wall 100c front wall 100d rear wall 110 Side Panel 130 Upper flange 150 Lower flange 200-1 1st bottom 200-2 2nd bottom 300-1 First lower width direction member 300-1a 1-1 lower width direction member 300-1b 1st-2nd lower width direction member 300-2 Second lower width direction member 300-2a No. 2-1 lower width direction member 300-2a-1 2nd-1 connection surface 300-2b 2nd-2nd lower width direction member 310-1 1st installation groove 310-2 2nd installation groove 400-1 First longitudinal member 400-2 Second longitudinal member 410-1 First longitudinal body 410-2 Second longitudinal body 430-1 First lower insertion groove 430-2 Second lower insertion groove 500 Mounting Frame 510 Upper plate 530 Lower plate 550 Side plate 570 Open area 600-1 First cooling panel section 600-2 Second cooling panel section 600M unit cooling panel 700-1 First upper width direction member 700-2 Second upper width direction member 800 Seal part 900 Mechanical fastening 910 Sleeve member 930 Long Bolt Material C1 Floor C2 body frame D Closed section E Connecting bracket L Module bracket La module joining plate Lb module support plate Lc separation groove M Battery Module M1 battery cell N-stacked module N1 First stacked module N2 Second stacked module S Storage space S1 cooling space S2 Compartment space X length direction Y width direction Z height direction

Claims

1. a side wall portion installed so as to surround the side of the storage space; a stacked module in which a plurality of battery modules are housed and stacked in the height direction in the housing space; The stacked module comprises: a first stacked module connected to the side wall portion and installed to close a lower portion of the accommodation space; and a battery case including: at least one second stack module disposed above the first stack module;

2. The first stacked module includes: a first bottom portion connected to the side wall portion and installed to close a lower portion of the receiving space; and a plurality of first lower width direction members connected to the first bottom portion and extending widthwise across the receiving space, the first lower width direction members being spaced apart in the length direction; The battery case according to claim 1 , wherein the first lower width direction member is welded to the first bottom portion.

3. The first stacked module includes: a first longitudinal member extending longitudinally across the receiving space and covering the first lower width members; The battery case according to claim 2 , wherein the first lengthwise member is welded to the first bottom and the plurality of first lower widthwise members.

4. The side wall portion is The battery case according to claim 3 , wherein the first bottom, the first lower width direction member, and the first length direction member are welded to each other.

5. The battery case according to claim 2 , further comprising: a first cooling panel portion installed on an upper side of the first lower width direction member to cool the battery module accommodated in the accommodation space.

6. The first lower width direction member is a first-1 lower width direction member having a first installation groove formed in an upper portion thereof in a concave shape for installation of the first cooling panel portion; and 6. The battery case according to claim 5, further comprising: a first-second lower width direction member disposed between the first lower width direction members adjacent in the longitudinal direction and having an upper end portion having a height equal to or less than that of a lower end portion of the first cooling panel portion.

7. The battery case of claim 6, further comprising: a first upper width direction member disposed above the first cooling panel portion and coupled to the first-1 lower width direction member.

8. The second stacked module includes: The battery case according to claim 1 , wherein the battery case is detachably coupled to the first stack module and the side wall portion.

9. The second stacked module includes: a second bottom portion disposed at the lower portion; and a plurality of second lower width direction members connected to the second bottom portion and extending widthwise across the receiving space, the second lower width direction members being spaced apart in the length direction; The battery case according to claim 2 , wherein the second lower width direction member is welded to the second bottom portion.

10. The battery case according to claim 9 , wherein the first lower width direction member has a height greater than that of the second lower width direction member.

11. The battery case according to claim 9 , wherein the second lower width direction member, the second bottom portion, and the first stack module are detachably coupled together in a state where they are stacked in a height direction.

12. The second lower width direction member (2-1) has a plurality of hat-shaped cross sections each having an open lower portion, and a second connecting surface (2-1) is formed between the two hat-shaped cross sections.

12. The battery case of claim 11, wherein the second bottom contacts the underside of the 2-1 connection surface, and the first stacked module is joined by a bolt fastening method in an overlapping state such that the second bottom contacts the underside of the first upper width direction member of the first stacked module.

13. The second stacked module includes: a second longitudinal member extending longitudinally across the receiving space and covering the second lower width members; The battery case according to claim 9 , wherein the second lengthwise member is welded to the second bottom and the plurality of second lower widthwise members.

14. The battery case according to claim 9 , further comprising: a second cooling panel portion installed on an upper side of the second lower width direction member and configured to cool the battery module accommodated in the accommodation space.

15. The second lower width direction member is a second-1 lower width direction member having a second installation groove formed in an upper portion thereof in a concave shape for installation of the second cooling panel portion; and a second-2 lower width direction member disposed between the second-1 lower width direction members adjacent in the longitudinal direction and having an upper end portion having a height equal to or less than that of a lower end portion of the second cooling panel portion; The battery case according to claim 14.

16. The battery case of claim 15, further comprising: a second upper width direction member disposed above the second cooling panel portion and coupled to the second-1 lower width direction member.

17. The battery case according to claim 1 , further comprising: a module bracket connected to the side wall, detachably connected to the second stack module, and supporting the second stack module.

18. The module bracket portion is a module joining plate welded to the side wall portion in an overlapping state; and The battery case according to claim 17 , further comprising: a module support plate formed to extend in a direction intersecting the module joining plate and detachably coupled to a second bottom portion of the second stack module.

19. a mount frame coupled to the side wall portion and disposed outside the storage space to form a coupling portion with a vehicle body; The battery case according to claim 1 , wherein the mounting frame is disposed at a position corresponding to the first stacked module in a height direction.

20. The battery case according to claim 19 , wherein the mounting frame is installed over the entire side of the side wall portion so as to surround the side surface of the side wall portion.

Images