Battery pack structure for vehicle

Abstract

To provide a battery pack structure for a vehicle.SOLUTION: A vehicle battery pack structure of the present invention includes: a lower case; a plurality of battery modules accommodated in the lower case; an upper case coupled to an upper portion of the lower case to seal a space where the battery modules are accommodated; a plurality of module fixing bolts penetrating end plates of the battery modules to be fixed to the lower case; a connection support bar disposed on upper sides of the end plates so as to connect the end plates of the battery modules adjacent to each other; and a plurality of through support bolts respectively penetrating the upper case and the connection support bar to be fixed to the end plates.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a technology relating to the structure of a battery pack mounted on a vehicle. [Background technology]

[0002] 2. Description of the Related Art Electric vehicles and the like are configured to generate driving force for the vehicle using a motor, and are equipped with a battery pack for supplying power to the motor.

[0003] The battery pack is configured by housing a plurality of battery modules in a battery case, and the battery module is configured by stacking a plurality of battery cells.

[0004] Therefore, the more total battery cells contained in the battery pack, the greater the vehicle's range can be.

[0005] Meanwhile, the battery pack must have sufficient structural rigidity to firmly and stably support the battery module as described above, as well as sufficient structural rigidity to prevent damage to the battery cells from external impacts.

[0006] In order to ensure the structural rigidity of the battery pack, it is preferable to provide a plurality of reinforcing members inside the battery case. However, such a plurality of reinforcing members tends to reduce the space in which the battery cells are to be mounted.

[0007] Therefore, the battery pack must be able to minimize structures such as reinforcing members so as to accommodate as many battery cells as possible, while still ensuring the structural rigidity required for the battery pack.

[0008] The matters described above as background art are merely intended to enhance understanding of the background of the present invention and should not be construed as admitting that they constitute prior art already known to those having ordinary skill in the art. Summary of the Invention [Problem to be solved by the invention]

[0009] An object of the present invention is to provide a vehicle battery pack structure that can accommodate as many battery cells as possible inside a battery case while minimizing structures such as reinforcing members and yet ensures sufficient structural rigidity required of the battery pack. [Means for solving the problem]

[0010] In order to achieve the above object, the vehicle battery pack structure of the present invention comprises: Lower case and a plurality of battery modules housed in the lower case; an upper case coupled to an upper portion of the lower case to seal a space in which the battery module is accommodated; a plurality of module fixing bolts that pass through end plates of the battery modules and fix the battery modules to the lower case; a connecting support bar disposed on an upper side of the end plate to connect the end plates of adjacent battery modules; The upper case and the connecting support bar are configured to include a plurality of through support bolts that pass through the upper case and the connecting support bar and are fixed to the end plate.

[0011] The through support bolts can be fixed to the end plates, bypassing the module fixing bolts.

[0012] The lower case is provided with a horizontal member, the end plates of the battery modules are formed such that recesses formed on the lower sides thereof surround the upper sides of the cross members; The module fixing bolts can be fastened to the lower case by passing through the end plates and the horizontal members.

[0013] When the battery modules are arranged on both sides of the horizontal member, the recessed portions of the end plates of the battery modules are arranged to surround the horizontal member symmetrically around the horizontal member, The connecting support bar is formed with a width that overlaps the upper surfaces of the end plates arranged on both sides of the horizontal member, The plurality of through-support bolts pass through the connecting support bar and are fastened to the end plates of two battery modules arranged on both sides of the cross member, respectively, thereby connecting the two battery modules to each other.

[0014] The lower case is provided with a vertical member that is installed so as to be elongated in a direction perpendicular to the horizontal member, The battery modules are arranged on both sides of the vertical member, the connection support bar is formed to a length that overlaps upper surfaces of the end plates of the battery modules disposed on both sides of the vertical member, The plurality of through-support bolts pass through the connecting support bar and are fastened to the end plates of two battery modules arranged on both sides of the vertical member, respectively, thereby connecting the two battery modules to each other.

[0015] The lower case is provided with a vertical member that is installed so as to be elongated in a direction perpendicular to the horizontal member, The battery modules are arranged at four locations around the intersection of the vertical members and the horizontal members, the connecting support bar is disposed to be elongated along the longitudinal direction of the horizontal member with a width that overlaps upper surfaces of end plates of battery modules on both sides of the horizontal member while passing above portions where the vertical member and the horizontal member intersect; The plurality of through-support bolts pass through the connecting support bar and are fastened to the end plates of the battery modules arranged at four locations around the intersection of the vertical member and the horizontal member, thereby connecting the battery modules arranged at the four locations to each other via the connecting support bar.

[0016] The lower case is provided with a cooling block having a plurality of cooling channels formed therein, the plurality of battery modules are accommodated on an upper side of the cooling block; The plurality of module fixing bolts may be fastened to the cooling block of the lower case, bypassing the cooling passage.

[0017] The lower case is provided with a horizontal member, the end plates of the battery modules are formed such that recesses formed on the lower sides thereof surround the upper sides of the cross members; The module fixing bolts can be fastened to the cooling block of the lower case by passing through the end plates and the horizontal members.

[0018] an opening is formed in an end plate of the battery module to receive a head of the module fixing bolt and prevent the head of the module fixing bolt from protruding above an upper surface of the end plate; The through support bolt can be fixed to the end plate while avoiding the opening. In order to achieve the above object, the vehicle battery pack structure of the present invention comprises: Lower case and a plurality of battery modules housed in the lower case; an upper case coupled to an upper portion of the lower case to seal a space in which the battery module is accommodated; an internal member installed to separate the battery modules; a plurality of module fixing bolts that pass through end plates of the battery modules and fix the battery modules to the lower case; a connecting support bar disposed on an upper side of the end plate to connect the end plates of adjacent battery modules; The upper case and the connecting support bar are configured to include a plurality of through support bolts that pass through the upper case and the connecting support bar and are fixed to the end plate.

[0019] the end plate of the battery module has a recess formed on a lower side thereof that surrounds an upper side of the inner member; The module fixing bolts can be fastened to the lower case by passing through the end plates and the inner members.

[0020] the recessed portions of the end plates of the battery modules disposed on both sides of an inner member disposed parallel to the end plates of the battery modules are disposed symmetrically around the inner member to surround the inner member, The connecting support bar is formed with a width that overlaps the upper surfaces of the end plates disposed on both sides of the inner member, The plurality of through-support bolts may penetrate the connection support bar and be fastened to the end plates of two battery modules arranged on both sides of the inner member, respectively, thereby connecting the two battery modules to each other.

[0021] the connection support bar is formed with a length that overlaps the upper surfaces of the end plates of the battery modules disposed on both sides of an inner member that is disposed perpendicular to the end plates of the battery modules; The plurality of through-support bolts may penetrate the connection support bar and be fastened to the end plates of two battery modules arranged on both sides of the inner member, respectively, thereby connecting the two battery modules to each other.

[0022] The inner member is a vertical member disposed so as to be elongated along the front-rear direction of the lower case; and horizontal members that are arranged perpendicular to the vertical members and extend along the horizontal direction of the lower case.

[0023] The battery modules are arranged at four locations around the intersection of the vertical members and the horizontal members, the connecting support bar is disposed to be elongated along the longitudinal direction of the horizontal member with a width that overlaps upper surfaces of end plates of battery modules on both sides of the horizontal member while passing above portions where the vertical member and the horizontal member intersect; The plurality of through-support bolts pass through the connecting support bar and are fastened to the end plates of the battery modules arranged at four locations around the intersection of the vertical member and the horizontal member, thereby connecting the battery modules arranged at four locations to each other via the connecting support bar.

[0024] The lower case is provided with a cooling block having a plurality of cooling channels formed therein, the plurality of battery modules are accommodated on an upper side of the cooling block; The plurality of module fixing bolts can be fastened to the cooling block of the lower case, avoiding the cooling flow passage.

[0025] an opening is formed in an end plate of the battery module to receive a head of the module fixing bolt and prevent the head of the module fixing bolt from protruding above an upper surface of the end plate; The through support bolt can be fixed to the end plate while avoiding the opening. [Effects of the Invention]

[0026] The present invention enables as many battery cells as possible to be housed inside a battery case, while minimizing structures such as reinforcing members, and yet ensuring sufficient structural rigidity required of the battery pack, thereby significantly improving the durability of the battery pack while increasing the vehicle's cruising range. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a diagram illustrating a battery pack to which the present invention is applied; [Figure 2] FIG. 2 is a diagram showing the battery pack of FIG. 1 with the upper case removed. [Figure 3] FIG. 2 is a diagram showing a lower case of the battery pack of FIG. 1. [Figure 4] FIG. 3 shows one of the battery modules of FIG. 2. [Figure 5] FIG. 5 is a diagram illustrating the battery module of FIG. 4 rotated 180 degrees on a horizontal plane. [Figure 6] This is an observation view in the VI direction of Figure 4. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. [Figure 9] FIG. 2 is a cross-sectional view taken along line IX-IX in FIG. [Figure 10] FIG. 3 is a detailed view of part A in FIG. 2. [Figure 11] FIG. 11 is a diagram showing a connection support bar omitted from FIG. 10. [Figure 12] FIG. 3 is a detailed view of part B in FIG. 2. [Figure 13] FIG. 13 is a diagram showing a state in which the connecting support bar is omitted from FIG. 12. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, the embodiments disclosed in this specification will be described in detail with reference to the accompanying drawings. Regardless of the drawing number, the same or similar components will be given the same reference numerals, and duplicate descriptions thereof will be omitted.

[0029] The suffixes "module" and "section" used in the following description for components are given or used in combination solely for the convenience of writing the specification, and do not have any meanings or roles that are distinct from each other in themselves.

[0030] In describing the embodiments disclosed herein, if it is determined that a detailed description of related publicly known technologies may distract from the gist of the embodiments disclosed herein, the detailed description will be omitted. Furthermore, the attached drawings are merely for facilitating an understanding of the embodiments disclosed herein, and the technical ideas disclosed herein should not be limited by the attached drawings, and should be understood to include all modifications, equivalents, or alternatives included within the spirit and technical scope of the present invention.

[0031] Terms including ordinal numbers such as "first" and "second" may be used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another.

[0032] When a component is said to be "coupled" or "connected" to another component, it should be understood that this includes cases where the component is directly coupled or connected to the other component, but also cases where there are other components between them. In contrast, when a component is said to be "directly coupled" or "directly connected" to another component, it should be understood that there are no other components between them.

[0033] The singular expression includes the plural expression unless the context clearly indicates otherwise.

[0034] In this specification, the terms "comprise" or "have" and the like are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0035] 1 to 13, an embodiment of the vehicle battery pack 1 structure of the present invention includes a lower case 3, a plurality of battery modules 5 housed in the lower case 3, an upper case 7 coupled to the upper side of the lower case 3 to seal the space housing the battery modules 5, a plurality of module fixing bolts 11 passing through end plates 9 of the battery modules 5 and fixed to the lower case 3, a connecting support bar 13 disposed above the end plates 9 to connect the end plates 9 of adjacent battery modules 5, and a plurality of through support bolts 15 passing through the upper case 7 and the connecting support bar 13 and fixed to the end plates 9.

[0036] That is, in the battery pack structure of the present invention, the plurality of battery modules 5 are accommodated in a battery accommodating space formed by the lower case 3 and upper case 7 that constitute the battery case 17 and sealed from the outside, the end plates 9 that constitute the battery modules 5 are directly fixed to the lower case 3 by the module fixing bolts 11, and adjacently arranged battery modules 5 are connected to each other by the connecting support bars 13 and the through support bolts 15 and coupled to the upper case 7, thereby realizing a sturdy battery module 5 fixing structure while minimizing the number of reinforcing members and the like that are placed in the battery accommodating space and maximizing the number of battery cells 19 that can be installed, thereby increasing the vehicle's cruising range and significantly improving the durability of the battery pack.

[0037] For reference, the end plates 9 are provided to form and maintain surface pressure of the internal battery cells 19 at both ends of the overlapping plurality of battery cells 19, and the sensing block 21 arranged to connect both ends of the two end plates 9 forms an electrical connection relationship between the overlapping battery cells 19 and functions to sense temperature, voltage, etc., and may be provided with an output terminal 23 of the battery module 5.

[0038] The through support bolts 15 are fixed to the end plates 9 , avoiding the module fixing bolts 11 .

[0039] In other words, the through support bolts 15 that pass through the upper case 7 and the connecting support bar 13 from the top of the upper case 7 and are fastened to the end plate 9 may overlap vertically with the module fixing bolts 11 that are fastened to the lower case 3 from the top of the end plate 9. To prevent this situation from occurring, the through support bolts 15 are configured to be connected to the end plate 9 at positions where the module fixing bolts 11 are not located.

[0040] In this embodiment, the lower case 3 is provided with a horizontal member 25, and the end plate 9 of the battery module 5 is formed such that a recess 27 formed on the lower side covers the upper side of the horizontal member 25, and the module fixing bolt 11 passes through the end plate 9 and the horizontal member 25 and is fastened to the lower case 3.

[0041] Therefore, the end plates 9 enclose the cross members 25, which reinforce the structural rigidity of the lower case 3, via the recesses 27, and the module fixing bolts 11 penetrate not only the end plates 9 but also the cross members 25 to be connected to the lower case 3, thereby ensuring sufficient structural rigidity of the battery pack 1 while minimizing the reduction in the space in which the battery cells 19 are accommodated due to the cross members 25.

[0042] In particular, as illustrated in FIG. 7 , when the battery modules 5 are arranged on both sides of the horizontal member 25, the recessed portions 27 of the end plates 9 of the battery modules 5 are arranged symmetrically around the horizontal member 25 to surround the horizontal member 25, the connecting support bar 13 is formed with a width that overlaps the upper surfaces of the end plates 9 arranged on both sides of the horizontal member 25, and the plurality of through support bolts 15 penetrate the connecting support bar 13 and are respectively fastened to the end plates 9 of the two battery modules 5 arranged on both sides of the horizontal member 25, thereby connecting the two battery modules 5 to each other.

[0043] Therefore, since the space occupied by the horizontal member 25 between the two battery modules 5 arranged on either side of the horizontal member 25 is substantially negligible, the battery module 5 can be configured to include a relatively larger number of battery cells 19.

[0044] In addition, in the above-described structure, the two battery modules 5 are coupled to the lower case 3 while being commonly connected to the horizontal member 25 at the lower side of the end plate 9, and are coupled to the upper case 7 while being commonly connected to the connecting support bar 13 at the upper side of the end plate 9, thereby forming a very sturdy fixed state of the battery modules 5 and also increasing the dimensional rigidity of the battery pack.

[0045] Meanwhile, the lower case 3 is provided with a vertical member 29 that is installed so as to be elongated in a direction perpendicular to the horizontal member 25, and the battery modules 5 are arranged on both sides of the vertical member 29, and the connecting support bar 13 is formed to a length that overlaps the upper surfaces of the end plates 9 of the battery modules 5 arranged on both sides of the vertical member 29, and the plurality of through support bolts 15 penetrate the connecting support bar 13 and are respectively fastened to the end plates 9 of the two battery modules 5 arranged on both sides of the vertical member 29, thereby connecting the two battery modules 5 to each other.

[0046] Referring to FIG. 8, the above-described state can be seen. In this configuration, the end plates 9 of the two battery modules 5 arranged on either side of the vertical member 29 are connected to each other via the horizontal members 25 at the bottom and joined to the lower case 3, and connected to each other via the connecting support bar 13 at the top and joined to the upper case 7. This not only forms a sturdy fixed state for the battery modules 5, but also contributes greatly to ensuring the dimensional rigidity of the battery pack.

[0047] 7 and 8 substantially correspond to the cross section of portion A in FIG. 2. Referring to FIGS. 10 and 11 together, the lower case 3 is provided with vertical members 29 that are installed to be elongated in a direction perpendicular to the horizontal members 25, the battery modules 5 are arranged at four locations around the intersection of the vertical members 29 and the horizontal members 25, the connection support bar 13 is arranged to be elongated along the length of the horizontal members 25 while passing above the intersection of the vertical members 29 and the horizontal members 25 and having a width that overlaps with the upper surfaces of the end plates 9 of the battery modules 5 on both sides of the horizontal members 25, and the plurality of through support bolts 15 pass through the connection support bar 13 and are fastened to the end plates 9 of the battery modules 5 that are arranged at four locations around the intersection of the vertical members 29 and the horizontal members 25, thereby connecting the battery modules 5 arranged at the four locations to one another via the connection support bar 13.

[0048] Therefore, the four battery modules 5, which are arranged around the intersection of the vertical members 29 and horizontal members 25, have their end plates 9 integrally connected to the horizontal members 25 via connecting support bars 13, and are joined at their upper sides to the upper case 7 and at their lower sides to the lower case 3, thereby forming a strong mutual fixing state of the battery modules 5 and increasing the rigidity of the battery pack.

[0049] For reference, as shown in Figures 9, 12, and 13, the battery module 5 may be disposed on only one side of the horizontal member 25. In this case, too, the end plate 9 of the battery module 5 penetrates the horizontal member 25 and is coupled to the lower case 3 via the module fixing bolts 11, and is coupled to the upper case 7 by the penetrating support bolts 15 while being connected to the end plates 9 of other battery modules 5 disposed across the vertical member 29 by the connecting support bars 13.

[0050] Meanwhile, the lower case 3 may be provided with a cooling block 33 having a plurality of cooling channels 31 formed therein, the plurality of battery modules 5 may be accommodated above the cooling block 33, and the plurality of module fixing bolts 11 may be fastened to the cooling block 33 of the lower case 3 while avoiding the cooling channels 31.

[0051] For example, the bottom of the lower case 3 can be made of an extruded material in which the cooling flow path 31 is formed, and in this case, it is preferable that the module fixing bolt 11 is configured to be fastened at a position that avoids the cooling flow path 31.

[0052] In the above-described structure, the end plates 9 of the battery modules 5 are disposed so as to enclose the upper sides of the cross members 25 via the recesses 27 formed on the lower sides thereof, and the module fixing bolts 11 pass through the end plates 9 and the cross members 25 and are fastened to the cooling blocks 33 of the lower case 3. At this time, the module fixing bolts 11 are fastened while avoiding the cooling channels 31 of the cooling block 33.

[0053] Meanwhile, an opening 35 is formed in the end plate 9 of the battery module 5 to accommodate the head of the module fixing bolt 11 and prevent the head of the module fixing bolt 11 from protruding above the upper surface of the end plate 9, and the through support bolt 15 is fixed to the end plate 9 while avoiding the opening 35.

[0054] As described above, if the opening 35 formed in the end plate 9 prevents the head of the module fixing bolt 11 from protruding above the upper surface of the end plate 9, the connecting support bar 13 will be fixed between the upper case 7 and the end plate 9 by the through support bolt 15 while in close contact with the upper surface of the end plate 9, thereby forming an extremely strong connection.

[0055] Meanwhile, the above-described present invention can also be expressed as follows.

[0056] In other words, an embodiment of the vehicle battery pack 1 structure of the present invention includes a lower case 3, a plurality of battery modules 5 housed in the lower case 3, an upper case 7 coupled to the upper side of the lower case 3 and sealing the space housing the battery modules 5, an internal member 37 installed to partition the battery modules 5, a plurality of module fixing bolts 11 passing through the end plates 9 of the battery modules 5 and fixed to the lower case 3, a connecting support bar 13 arranged above the end plates 9 to connect the end plates 9 of adjacent battery modules 5, and a plurality of through support bolts 15 passing through the upper case 7 and the connecting support bar 13 and fixed to the end plates 9.

[0057] The end plate 9 of the battery module 5 is formed such that the recess 27 formed on the lower side covers the upper side of the inner member 37, and the module fixing bolt 11 passes through the end plate 9 and the inner member 37 and is fastened to the lower case 3.

[0058] The recessed portions 27 of the end plates 9 of the battery modules 5 arranged on both sides of an inner member 37 arranged parallel to the end plates 9 of the battery modules 5 are arranged symmetrically around the inner member 37 to surround the inner member 37, the connection support bar 13 is formed with a width that overlaps the upper surfaces of the end plates 9 arranged on both sides of the inner member 37, and the plurality of through support bolts 15 penetrate the connection support bar 13 and are fastened to the end plates 9 of the two battery modules 5 arranged on both sides of the inner member 37, respectively, thereby connecting the two battery modules 5 to each other.

[0059] The connection support bar 13 is formed to a length that overlaps the upper surfaces of the end plates 9 of the battery modules 5 arranged on both sides around an inner member 37 that is arranged perpendicular to the end plates 9 of the battery modules 5, and the plurality of through support bolts 15 penetrate the connection support bar 13 and are fastened to the end plates 9 of the two battery modules 5 arranged on both sides around the inner member 37, respectively, thereby connecting the two battery modules 5 to each other.

[0060] On the other hand, the internal member 37 is composed of a vertical member 29 arranged so as to be long along the front-to-rear direction of the lower case 3, and a horizontal member 25 arranged so as to be long along the horizontal direction of the lower case 3 perpendicular to the vertical member 29, and can be interpreted as a type of reinforcing member for reinforcing the rigidity of the battery case.

[0061] In particular, the vertical members 29 and horizontal members 25 are installed to linearly connect the side walls that form the outer periphery of the lower case, and can function to support the battery pack 1 against external impacts.

[0062] The battery modules 5 are arranged at four locations around the intersection of the vertical members 29 and the horizontal members 25, and the connecting support bar 13 is arranged to be long along the longitudinal direction of the horizontal members 25, with a width that overlaps the upper surfaces of the end plates 9 of the battery modules 5 on both sides of the horizontal members 25 while passing above the intersection of the vertical members 29 and the horizontal members 25. The plurality of through support bolts 15 pass through the connecting support bar 13 and are respectively fastened to the end plates 9 of the battery modules 5 arranged at four locations around the intersection of the vertical members 29 and the horizontal members 25, thereby connecting the battery modules 5 arranged at the four locations to each other via the connecting support bar 13.

[0063] The lower case 3 is provided with a cooling block 33 having a plurality of cooling channels 31 formed therein, the plurality of battery modules 5 are accommodated on the upper side of the cooling block 33, and the plurality of module fixing bolts 11 are fastened to the cooling block 33 of the lower case 3, avoiding the cooling channels 31.

[0064] An opening 35 is formed in the end plate 9 of the battery module 5 to accommodate the head of the module fixing bolt 11 and prevent the head of the module fixing bolt 11 from protruding above the upper surface of the end plate 9, and the through support bolt 15 is fixed to the end plate 9 while avoiding the opening 35.

[0065] While the present invention has been illustrated and described with respect to particular embodiments, it will be apparent to those skilled in the art that various modifications and changes can be made therein without departing from the spirit of the invention as set forth in the following claims. [Explanation of symbols]

[0066] 1 battery pack 3 Lower Case 5 Battery Module 7 Upper Case 9 End Plate 11 Module fixing bolt 13 Connecting support bar 15 Through support bolt 17 Battery case 19 battery cells 21 Sensing Block 23 Output terminal 25 Horizontal member 27 Depression 29 Vertical Members 31 Cooling channel 33 Cooling Block 35 Opening 37 Internal Members

Claims

1. Lower case and a plurality of battery modules housed in the lower case; an upper case coupled to an upper portion of the lower case to seal a space in which the battery module is accommodated; a plurality of module fixing bolts that pass through end plates of the battery modules and fix the battery modules to the lower case; a connecting support bar disposed on an upper side of the end plate to connect the end plates of adjacent battery modules; a plurality of through-support bolts that pass through the upper case and the connecting support bar and are fixed to the end plate.

2. The vehicle battery pack structure according to claim 1 , wherein the through support bolts are fixed to the end plates while avoiding the module fixing bolts.

3. The lower case is provided with a horizontal member, the end plates of the battery modules are formed such that recesses formed on the lower sides thereof surround the upper sides of the cross members; The vehicle battery pack structure according to claim 2, wherein the module fixing bolts pass through the end plates and the cross members and are fastened to the lower case.

4. When the battery modules are arranged on both sides of the horizontal member, the recessed portions of the end plates of the battery modules are arranged to surround the horizontal member symmetrically around the horizontal member, The connecting support bar is formed with a width that overlaps the upper surfaces of the end plates arranged on both sides of the horizontal member, 4. The vehicle battery pack structure of claim 3, wherein the plurality of through support bolts pass through the connection support bar and are fastened to end plates of two battery modules disposed on both sides of the cross member, respectively, thereby connecting the two battery modules to each other.

5. The lower case is provided with a vertical member that is installed so as to be elongated in a direction perpendicular to the horizontal member, The battery modules are arranged on both sides of the vertical member, the connection support bar is formed to a length that overlaps upper surfaces of the end plates of the battery modules disposed on both sides of the vertical member, 4. The vehicle battery pack structure of claim 3, wherein the plurality of through-support bolts penetrate the connection support bar and are fastened to end plates of two battery modules disposed on both sides of the vertical member, respectively, to connect the two battery modules to each other.

6. The lower case is provided with a vertical member that is installed so as to be elongated in a direction perpendicular to the horizontal member, The battery modules are arranged at four locations around the intersection of the vertical members and the horizontal members, the connecting support bar is disposed to be elongated along the longitudinal direction of the horizontal member with a width that overlaps upper surfaces of end plates of battery modules on both sides of the horizontal member while passing above portions where the vertical member and the horizontal member intersect; 4. The vehicle battery pack structure of claim 3, wherein the plurality of through support bolts penetrate the connection support bar and are fastened to end plates of the battery modules arranged at four locations around an intersection of the vertical member and the horizontal member, thereby connecting the battery modules arranged at the four locations to each other via the connection support bar.

7. The lower case is provided with a cooling block having a plurality of cooling channels formed therein, the plurality of battery modules are accommodated on an upper side of the cooling block; The vehicle battery pack structure according to claim 2, wherein the plurality of module fixing bolts are fastened to the cooling block of the lower case, bypassing the cooling flow path.

8. The lower case is provided with a horizontal member, the end plates of the battery modules are formed such that recesses formed on the lower sides thereof surround the upper sides of the cross members; The vehicle battery pack structure according to claim 7, wherein the module fixing bolts pass through the end plates and the horizontal members and are fastened to the cooling block of the lower case.

9. an opening is formed in an end plate of the battery module to receive a head of the module fixing bolt and prevent the head of the module fixing bolt from protruding above an upper surface of the end plate; The vehicle battery pack structure according to claim 2 , wherein the through support bolt is fixed to the end plate while avoiding the opening.

10. Lower case and a plurality of battery modules housed in the lower case; an upper case coupled to an upper portion of the lower case to seal a space in which the battery module is accommodated; an internal member installed to separate the battery modules; a plurality of module fixing bolts that pass through end plates of the battery modules and fix the battery modules to the lower case; a connecting support bar disposed on an upper side of the end plate to connect the end plates of adjacent battery modules; a plurality of through-support bolts that pass through the upper case and the connecting support bar and are fixed to the end plate.

11. the end plate of the battery module has a recess formed on a lower side thereof that surrounds an upper side of the inner member; The vehicle battery pack structure according to claim 10, wherein the module fixing bolts are fastened to the lower case by passing through the end plates and the inner members.

12. the recessed portions of the end plates of the battery modules disposed on both sides of an inner member disposed parallel to the end plates of the battery modules are disposed symmetrically around the inner member to surround the inner member, The connecting support bar is formed with a width that overlaps the upper surfaces of the end plates disposed on both sides of the inner member, 12. The vehicle battery pack structure of claim 11, wherein the plurality of through support bolts penetrate the connection support bar and are fastened to end plates of two battery modules disposed on both sides of the inner member, respectively, to connect the two battery modules to each other.

13. the connection support bar is formed with a length that overlaps upper surfaces of the end plates of the battery modules disposed on both sides of an inner member that is disposed perpendicular to the end plates of the battery modules; 12. The vehicle battery pack structure of claim 11, wherein the plurality of through support bolts penetrate the connection support bar and are fastened to end plates of two battery modules disposed on both sides of the inner member, respectively, to connect the two battery modules to each other.

14. The inner member is a vertical member disposed so as to be elongated along the front-rear direction of the lower case; and horizontal members arranged perpendicular to the vertical members and extending along the lateral direction of the lower case.

15. The battery modules are arranged at four locations around the intersection of the vertical members and the horizontal members, the connecting support bar is disposed to be elongated along the longitudinal direction of the horizontal member with a width that overlaps upper surfaces of end plates of battery modules on both sides of the horizontal member while passing above portions where the vertical member and the horizontal member intersect; 15. The vehicle battery pack structure of claim 14, wherein the plurality of through support bolts penetrate the connection support bar and are fastened to end plates of the battery modules arranged at four locations around an intersection of the vertical member and the horizontal member, thereby connecting the battery modules arranged at the four locations to each other via the connection support bar.

16. The lower case is provided with a cooling block having a plurality of cooling channels formed therein, the plurality of battery modules are accommodated on an upper side of the cooling block; The vehicle battery pack structure according to claim 11, wherein the plurality of module fixing bolts are fastened to the cooling block of the lower case, bypassing the cooling flow path.

17. an opening is formed in an end plate of the battery module to receive a head of the module fixing bolt and prevent the head of the module fixing bolt from protruding above an upper surface of the end plate; The vehicle battery pack structure according to claim 10, wherein the through support bolt is fixed to the end plate while avoiding the opening.

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