Electric vehicle body structure

Abstract

An exemplary vehicle body structure of an electric vehicle includes: a floor panel covering an upper side of a battery accommodating space; an integral battery front cross beam disposed on a front lower side of the floor panel and covering a front portion of the battery accommodating space; an instrument panel cross beam coupled to the floor panel and the integral battery front cross beam; a front side member disposed at a front side of the instrument panel cross member; and a front side rear lower beam connecting a rear portion of the front side beam to the instrument panel cross beam.

Description

Technical Field

[0001] The present disclosure relates to an electric vehicle body structure. Background Art

[0002] The electric vehicle is configured to be driven by driving a motor using electric power provided by a battery mounted on the vehicle.

[0003] Therefore, the driving range of a vehicle is greatly affected by the energy storage capacity of the battery installed on the vehicle.

[0004] Installing a battery on a vehicle so that the vehicle can store as much electrical energy as possible and ensuring various collision response performances required of the vehicle are both main goals in developing electric vehicles.

[0005] Recently, in order to increase the number of battery packs mounted on a vehicle, a vehicle structure adopting a battery-to-body (CTB) method has been developed in which the battery packs are directly mounted on the vehicle body.

[0006] The details described as background technology for the embodiments of the present disclosure are only intended to enhance the understanding of the background technology for the embodiments of the present disclosure, and should not be considered as an admission that they correspond to already known prior art. Summary of the invention

[0007] Various aspects of the embodiments of the present disclosure are directed to providing a battery-to-body (CTB) method in which a battery pack is directly mounted on a vehicle body and a vehicle body structure for an electric vehicle so as to effectively protect the battery pack by providing a strong impact support structure to resist impact forces from the front and rear of the vehicle body.

[0008] According to one embodiment of the present disclosure, an electric vehicle body structure is provided, which includes: a floor panel installed to cover the upper side of a battery accommodating space; an integral battery front cross beam arranged on the front lower side of the floor panel and covering the front portion of the battery accommodating space; an instrument panel cross beam connected to the floor panel and the integral battery front cross beam; a front side beam arranged at the front side of the instrument panel cross beam; and a front side rear lower beam connecting the rear portion of the front side beam to the instrument panel cross beam.

[0009] According to an embodiment of the present disclosure, the electric vehicle body structure may further include: an integral battery rear cross beam, which is arranged on the rear lower side of the floor panel and covers the rear part of the battery accommodating space; a side sill (side sill), which is connected to the two ends of the integral battery front cross beam and the two ends of the integral battery rear cross beam and covers the side part of the battery accommodating space; and a battery lower module, which is connected to the lower side of the integral battery front cross beam, the lower side of the integral battery rear cross beam and the lower side of the side sill and covers the lower part of the battery accommodating space.

[0010] In an embodiment of the present disclosure, the battery lower module may include: an external front beam of the lower module, connected to the lower side of the integral battery front beam; an external rear beam of the lower module, connected to the lower side of the integral battery rear beam; an external side beam of the lower module, connected to the lower side of the side surrounding beam; and a lower plate, connected to the lower side of the external front beam of the lower module, the lower side of the external rear beam of the lower module, and the lower side of the external side beam of the lower module, and covering the lower portion of the battery accommodating space.

[0011] In an embodiment of the present disclosure, a dashboard cross member may be coupled to an upper side of the floor panel and a front side of the integrated battery front cross member.

[0012] In an embodiment of the present disclosure, the front rear lower beam may be coupled by vertically surrounding the front surface of the instrument panel cross beam and may be coupled to the front side of the integrated battery front cross beam.

[0013] In an embodiment of the present disclosure, the electric vehicle body structure may further include an extended side beam connecting a rear portion of the front side beam to the A-pillar by coupling with the front rear lower beam, and a lower end portion of the A-pillar is coupled to the side frame beam.

[0014] In an embodiment of the present disclosure, the electric vehicle body structure may further include a dashboard cross member extension beam installed to connect the dashboard cross member to the side frame member and the A-pillar.

[0015] In an embodiment of the present disclosure, the floor panel may be provided with: a floor front cross beam, which is configured to protrude upward to connect two side beams; and a dashboard floor connecting beam, which may be configured to connect the dashboard cross beam and the floor front cross beam along the front-to-rear direction of the vehicle body and support the gap between the dashboard cross beam and the floor front cross beam.

[0016] In an embodiment of the present disclosure, a corner reinforcement beam obliquely coupled to the integrated battery rear cross beam and the side enclosure beam may be provided between the integrated battery rear cross beam and the side enclosure beam.

[0017] In an embodiment of the present disclosure, a coupling flange protruding toward the battery receiving space and coupled to a lower surface of the floor panel may be integrally provided on an upper side of the corner reinforcement beam.

[0018] In an embodiment of the present disclosure, the battery lower module may include a lower module outer corner beam, which is obliquely connected to the lower module outer rear beam and the lower module outer side beam on the lower side of the corner reinforcement beam, and the lower module outer corner beam may also be arranged between the lower module outer rear beam and the lower module outer side beam.

[0019] The lower module outer front beam, the lower module outer rear beam, the lower module outer side beam and the lower module outer corner beam can be configured to be connected with the integral battery front beam, the integral battery rear beam, the side beam and the corner reinforcement beam by utilizing gaskets, thereby forming a closed curve therebetween to seal the battery accommodation space.

[0020] A rear side beam is coupled to the rear end portion of the side frame beam. The front end portion of the rear side beam may be formed in a shape surrounding the upper side surface, the lower side surface and the rear end portion of the side frame beam.

[0021] The electric vehicle body structure may also include: a lower rib of the side frame beam, which is located in the side frame beam and forms a downwardly open groove together with the outer side frame of the lower module; a rear partition wall portion, which is located in the rear side frame and extends from the upper side to the lower side to surround the rear end portion of the side frame beam; and a partition wall flange portion, which is located in the rear side frame and is inserted into the groove formed by the lower rib of the side frame beam and the outer side frame of the lower module at the lower end portion of the rear partition wall portion, thereby surrounding the lower side of the side frame beam.

[0022] The rear side beam may be coupled to support the rear portion of the corner reinforcement beam and the side enclosure beam.

[0023] The floor panel is provided with a floor rear cross member which is provided to protrude upward to connect the two side surrounding members, the rear side member may be coupled to the floor rear cross member, and the rear subframe may also be installed on a lower side of the rear side member.

[0024] An electric vehicle body structure may include a floor panel in which a cross-sectional shape having multiple closed cross sections is formed by extending in a lateral direction of the vehicle body, and an integral battery front beam and an integral battery rear beam are integrally made with the floor panel to form a cross section protruding from the lower side of the floor panel.

[0025] A plurality of floor panels are arranged in the front-to-rear direction to surround the upper side of the battery accommodation space in a plane. The floor panel provided with the integrated battery front cross beam is also integrally formed with the floor front cross beam protruding upward to connect the two side surrounding beams. The floor panel provided with the integrated battery rear cross beam can also be integrally formed with the floor rear cross beam protruding upward to connect the two side surrounding beams.

[0026] The front subframe is mounted on the underside of the front side beam. The rear end of the front subframe can also be supported on the underside of the instrument panel cross member by the front subframe mounting bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram showing the structure of a body of an electric vehicle according to an embodiment of the present disclosure.

[0028] Figure 2 The view from the front is shown Figure 1 Schematic diagram of the car body.

[0029] Figure 3 is from Figure 1 Detailed illustration of the body with the side members removed.

[0030] Figure 4 is from Figure 2 Detailed illustration of the extended side sills removed.

[0031] Figure 5 Viewed from below Figure 2 View of the extended side members and instrument panel cross member extension has been removed.

[0032] Figure 6 is along Figure 1 A cross-sectional view taken along line VI-VI in FIG.

[0033] Figure 7 is along Figure 1 A cross-sectional view taken along line VII-VII in FIG.

[0034] Figure 8 It shows Figure 1 Schematic diagram of the main parts of the rear side of the vehicle body.

[0035] Fig. 9 Observed from the bottom Figure 8 Detailed schematic diagram of the main parts.

[0036] Fig.10 By disassembling Figure 1 A schematic diagram showing the main parts of the rear side of the vehicle body.

[0037] Fig.11 is from Fig.10 Schematic diagram of the bottom side observation.

[0038] Fig.12 yes Figure 1 Bottom view of the car body in. DETAILED DESCRIPTION

[0039] Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings. However, regardless of the reference numerals, the same or similar components will be given the same reference numerals, and, in this regard, redundant explanations will be omitted.

[0040] In the following description, suffixes “module” and “part” for components are given or used interchangeably only for ease of writing the specification, and thus they themselves do not always have different meanings or roles.

[0041] In describing the embodiments disclosed in the present specification, if it is determined that a detailed description of related known technology may obscure the gist of the embodiments disclosed in the present specification, the detailed description will be omitted.

[0042] In addition, the drawings are only intended to facilitate understanding of the embodiments disclosed in this specification. The technical concept disclosed in this specification is not limited by the drawings, and the embodiments should also be understood to include all modifications, equivalents and substitutes within the spirit and scope of the present disclosure.

[0043] Terms including ordinal numbers (such as first, second, etc.) may be used to describe different components. However, the above components are not limited by the above terms. The above terms are only used to distinguish one component from another.

[0044] When a component is referred to as being "connected" or "coupled" to another component, it should be understood that the component can be directly connected or directly coupled to another component; however, it should also be understood that other components may exist between them. Conversely, only when a component is referred to as being "directly connected" or "directly coupled" to another component, it should be understood that no other components exist between them.

[0045] A singular expression includes a plural expression unless it is clearly expressed differently in the context.

[0046] In this specification, terms such as "including" or "having" are intended to stipulate that the described features, quantities, steps, operations, components, parts or combinations thereof are present in this specification; therefore, it should be understood that this does not preclude the possibility of the existence or addition of one or more other features, quantities, steps, operations, components, parts or combinations thereof.

[0047] refer to Figures 1 to 12 In the electric vehicle body structure of the embodiment of the present disclosure, the body structure includes: a floor panel 3 installed to cover the upper side of the battery accommodating space 1; an integral battery front cross beam 5, arranged on the front lower side of the floor panel 3 and covering the front of the battery accommodating space 1; an instrument panel cross beam 7, connected to the floor panel 3 and the integral battery front cross beam 5; a front side beam 9, arranged on the front side of the instrument panel cross beam 7; and a front side rear lower beam 11, connecting the rear of the front side beam 9 to the instrument panel cross beam 7.

[0048] In other words, the electric vehicle body structure of the embodiment of the present disclosure is configured so that the floor panel 3 plays the role of a shell covering the upper side of the battery accommodation space 1 that accommodates the battery pack. The front side beam 9 is also connected to the instrument panel cross beam 7 through the front side rear lower beam 11. The instrument panel cross beam 7 also effectively supports the impact input from the front to the rear through the front side beam 9 by being supported by the floor panel 3 and the integral battery front cross beam 5. Therefore, the electric vehicle body structure is configured to safely protect the battery pack in the battery accommodation space 1.

[0049] In addition, the electric vehicle body structure of the embodiment of the present disclosure is configured with: an integral battery rear cross beam 13, which is arranged on the rear lower side of the floor panel 3 and covers the rear part of the battery accommodating space 1; a side frame beam 15, which is connected to the two end parts of the integral battery front cross beam 5 and the two end parts of the integral battery rear cross beam 13, and covers the side part of the battery accommodating space 1; and a battery lower module 17, which is connected to the lower side of the integral battery front cross beam 5, the lower side of the integral battery rear cross beam 13 and the lower side of the side frame beam 15, and covers the lower part of the battery accommodating space 1.

[0050] Here, the battery lower module 17 includes: a lower module external front cross beam 19, connected to the lower side of the integral battery front cross beam 5; a lower module external rear cross beam 21, connected to the lower side of the integral battery rear cross beam 13; a lower module external side beam 23, connected to the lower side of the side surrounding beam 15; and a lower plate 25, connected to the lower side of the lower module external front cross beam 19, the lower side of the lower module external rear cross beam 21 and the lower side of the lower module external side beam 23, and covering the lower part of the battery accommodating space 1.

[0051] In other words, the battery accommodating space 1 is configured to include: the upper side of the battery accommodating space 1 is covered by the floor panel 3; the lower side of the battery accommodating space 1 is covered by the lower plate 25; the front of the battery accommodating space 1 is covered by the integral battery front cross beam 5 and the lower module external front cross beam 19; the two sides of the battery accommodating space 1 are covered by the side panel beam 15 and the lower module external side beam 23; and the rear of the battery accommodating space is covered by the integral battery rear cross beam 13 and the lower module external rear cross beam 21.

[0052] The instrument panel cross member 7 is coupled to the upper side of the floor panel 3 and the front surface of the integrated battery front cross member 5 .

[0053] In other words, the dashboard cross member 7 is coupled to a shape surrounding the front upper side edge formed by the floor panel 3 and the integrated battery front cross member 5. Therefore, the load transmitted rearward through the dashboard cross member 7 can be dispersed and supported by the floor panel 3 and the integrated battery front cross member 5.

[0054] The front-side rear lower beam 11 is coupled to vertically surround the front surface of the instrument panel cross beam 7 and is coupled to the front surface of the integrated battery front cross beam 5 .

[0055] Therefore, the load transmitted rearward through the front side members 9 is transmitted to the instrument panel cross member 7 , and the load is also dispersed and transmitted to the integrated battery front cross member 5 .

[0056] Furthermore, the electric vehicle body structure of the embodiment of the present disclosure includes an extension side member 29 that connects the rear portion of the front side member 9 to the A-pillar 27 by coupling with the front rear lower member 11 , and the lower end portion of the A-pillar is coupled to the side frame member 15 .

[0057] In other words, the extension side member 29 connects the rear portion of the front side member 9 to the A-pillar 27 by forming a closed section with the front rear lower member 11 so as to be supported.

[0058] For reference, in this drawing, an upper side portion of the A-pillar 27 is omitted, and only a lower side portion of the A-pillar 27 is shown.

[0059] The electric vehicle body structure of the embodiment of the present disclosure further includes a dashboard cross member extension beam 31 installed to connect the dashboard cross member 7 to the side frame member 15 and the A-pillar 27 .

[0060] In other words, the dashboard cross beam extension beam 31 not only increases the coupling force between the dashboard cross beam 7 and the side frame beam 15 , but also plays a role of more firmly connecting the lower portion of the A-pillar 27 to the side frame beam 15 by being installed as if extending both ends of the dashboard cross beam 7 and by being coupled to the A-pillar 27 and the side frame beam 15 .

[0061] The electric vehicle body structure of the embodiment of the present disclosure also includes a floor panel 3, in which a floor front cross beam 33 is provided, which is configured to protrude upward to connect the two side frame beams 15, and a dashboard floor connecting beam 35 is also provided, which connects and supports the dashboard cross beam 7 and the floor front cross beam 33 along the front-to-rear direction of the vehicle body and supports the gap between the dashboard cross beam and the floor front cross beam.

[0062] Therefore, the dashboard cross beam 7 can be connected and supported by the floor front cross beam 33 and the dashboard floor connecting beam 35 at the rear in the front-to-rear direction, and by dispersing and supporting the load input from the front side beam 9 to the dashboard floor connecting beam 35 and the floor front cross beam 33, the battery in the battery accommodating space 1 can be more effectively protected from the front collision of the vehicle, etc.

[0063] A corner reinforcement beam 37 obliquely coupled to the integrated battery rear cross beam 13 and the side enclosure beam 15 may be provided between the integrated battery rear cross beam 13 and the side enclosure beam 15 .

[0064] In other words, the integrated battery rear cross beam 13 can configure the battery accommodation space 1 by being directly connected to the side frame beam 15. However, by further increasing the volume of the battery accommodation space 1, in the case where the rear portion of the battery accommodation space 1 is extended to increase the battery pack accommodated (as described above), the gap between the integrated battery rear cross beam 13 and the side frame beam 15 can be configured to be connected using the corner reinforcement beam 37.

[0065] A coupling flange 39 protruding toward the battery receiving space 1 and coupled to a lower surface of the floor panel 3 may be integrally provided on an upper side of the corner reinforcement beam 37 .

[0066] When the coupling flange 39 is welded at the floor panel 3 using a method such as friction stir welding (FSW), it provides easy weldability.

[0067] The battery lower module 17 includes a lower module outer corner beam 41 obliquely coupled to the lower module outer rear beam 21 and the lower module outer side beam 23 on the lower side of the corner reinforcement beam 37 and between the lower module outer rear beam 21 and the lower module outer side beam 23 .

[0068] In other words, as described above, in the case where the corner reinforcement beam 37 is provided, the battery lower module 17 is also provided with the lower module outer corner beam 41 in order to be coupled to the lower side of the corner reinforcement beam 37. Therefore, the battery receiving space 1 can be completely sealed.

[0069] The lower module outer front beam 19, the lower module outer rear beam 21, the lower module outer side beam 23 and the lower module outer corner beam 41 are vertically connected with the integral battery front beam 5, the integral battery rear beam 13, the side beam 15 and the corner reinforcement beam 37 using gaskets to form a closed curve therebetween. Therefore, the battery accommodation space 1 is sealed.

[0070] For reference, as described above, the gasket 43 is compressed by being inserted between the beams. However, the gasket 43 is shown as protruding into the beams relatively located on the upper side in the figure (such as the integrated battery front cross beam 5, the integrated battery rear cross beam 13, the side frame beam 15 and the corner reinforcement beam 37).

[0071] The rear side beam 45 is coupled to the rear end portion of the side frame beam 15. The front end portion of the rear side beam 45 is also formed in a shape surrounding the upper side surface, the lower side surface, and the rear end portion of the side frame beam 15.

[0072] The side member 15 is provided with a side member lower rib 47 , which forms a groove opening downward together with the lower module outer side member 23 .

[0073] In addition, the rear side beam 45 is provided with: a rear side partition wall portion 49 extending from the upper side to the lower side to surround the rear end portion of the side frame beam 15; and a partition wall flange portion 51 inserted into a groove formed by the side frame beam lower rib 47 and the lower module outer side beam 23 at the lower end portion of the rear side partition wall portion 49, thereby surrounding the lower side of the side frame beam 15.

[0074] Therefore, the side member 15 and the rear side member 45 have a stable connection structure not only in the front-rear direction but also in the up-down direction and the left-right direction.

[0075] The rear side member 45 is coupled to the side enclosure member 15 to support the rear portion of the corner reinforcement member 37 .

[0076] Therefore, the load input from the rear side member 45 is dispersed into the corner reinforcement member 37 and the side panel member 15. Therefore, the load is supported.

[0077] Furthermore, the floor panel 3 is provided with a floor rear cross member 53 which is provided to protrude upward to connect the two side surrounding members 15. The rear side member 45 is also coupled to the floor rear cross member 53.

[0078] In other words, the rear side member 45 forms a stronger connection structure with the side frame member 15 , the corner reinforcement member 37 , and the floor rear cross member 53 by being connected to the above-mentioned beams.

[0079] Furthermore, a rear subframe 55 is mounted on the lower side of the rear side member 45. The rear wheels and the like are mounted on the rear subframe 55.

[0080] A floor panel 3 including a cross-sectional shape having a plurality of closed cross sections is formed, and the cross-sectional shape extends in the lateral direction of the vehicle body, and an integral battery front cross member 5 and an integral battery rear cross member 13 are also integrally formed with the floor panel 3 to form a cross section protruding from the lower side of the floor panel 3.

[0081] In other words, in the embodiment of the present disclosure, a plurality of floor panels 3 are arranged in the front-rear direction to planarly surround the upper side of the battery accommodation space 1. As described above, the frontmost floor panel 3 is also integrally formed with the integral battery front cross beam 5. The rearmost floor panel 3 is also integrally formed with the integral battery rear cross beam 13.

[0082] Therefore, there is an advantage that it is not necessary to join the floor panel 3 , the integrated battery front cross member 5 , and the integrated battery rear cross member 13 by welding or the like.

[0083] That is, if the assembly work of joining the floor panel 3 to the side frame member 15 and joining the floor panel 3 to the corner reinforcement member 37 is performed in the FSW manner, a considerable assembly time may be required. However, in this case, as described above, no special joining work such as FSW is required for the floor panel 3, the integrated battery front cross member 5, and the integrated battery rear cross member 13. Therefore, this part of the embodiment of the present disclosure contributes to improving vehicle assembly productivity.

[0084] Furthermore, in the vehicle body structure of the embodiment of the present disclosure, a floor front cross member 33 protruding upward is integrally formed so that the floor panel 3 provided with the integral battery front cross member 5 connects the two side frame members 15. The floor panel 3 provided with the integral battery rear cross member 13 is also configured so that a floor rear cross member 53 protruding upward is integrally formed to connect the two side frame members 15. Therefore, the vehicle body structure of the embodiment of the present disclosure minimizes unnecessary assembly work and also provides a vehicle body structure that is stronger than ever before, thereby increasing the torsional rigidity of the vehicle body, etc.

[0085] Meanwhile, a front subframe 57 is mounted on the lower side of the front side member 9. The rear end of the front subframe 57 is also supported on the lower side of the instrument panel cross member 7 by a front subframe mounting bracket 59.

[0086] The front subframe 57 may support driving components such as front wheels, a motor, and the like.

[0087] The embodiments of the present disclosure have been shown and described with respect to specific embodiments. However, it is obvious to those skilled in the art that the present disclosure can be modified and changed in various ways within the scope of the technical spirit of the present disclosure defined by the scope of the appended claims.

Claims

1. A body structure for an electric vehicle, the body structure comprising: a floor panel covering the upper side of the battery accommodation space; an integral battery front cross beam disposed on the front lower side of the floor panel and covering the front portion of the battery accommodation space; an instrument panel cross member coupled to the floor panel and the integral battery front cross member; A front side beam, arranged at the front side of the instrument panel cross beam; as well as A front side rear lower member connects the rear portion of the front side member to the instrument panel cross member.

2. The vehicle body structure according to claim 1, further comprising: an integral battery rear cross beam disposed on the rear lower side of the floor panel and covering the rear portion of the battery accommodation space; A side frame beam connected to both ends of the integrated battery front cross beam and both ends of the integrated battery rear cross beam and covering a side portion of the battery accommodation space; as well as A battery lower module is coupled to the lower side of the integrated battery front cross beam, the lower side of the integrated battery rear cross beam and the lower side of the side frame beam, and the battery lower module covers the lower portion of the battery accommodating space.

3. The vehicle body structure according to claim 2, wherein: The battery lower module comprises: a lower module external front cross beam coupled to the lower side of the integrated battery front cross beam; a lower module external rear cross member coupled to the lower side of the integrated battery rear cross member; a lower module outer side member coupled to a lower side of the side enclosure member; and A lower plate is coupled to a lower side of the lower module outer front beam, a lower side of the lower module outer rear beam, and a lower side of the lower module outer side beam to cover a lower portion of the battery receiving space.

4. The vehicle body structure according to claim 2, wherein: The instrument panel cross member is coupled to both an upper side of the floor panel and a front side of the integrated battery front cross member.

5. The vehicle body structure according to claim 2, wherein: The front rear lower beam is coupled to surround a front surface of the instrument panel cross beam in a vertical direction, and the front rear lower beam is coupled to a front side of the integrated battery front cross beam.

6. The vehicle body structure according to claim 5, further comprising an extended side member coupled to the front rear lower member and connecting a rear portion of the front side member to an A-pillar, a lower end portion of the A-pillar being coupled to a corresponding one of the side enclosure members. 7 . The vehicle body structure according to claim 6 , further comprising an instrument panel cross member extension beam, wherein the instrument panel cross member extension beam connects the instrument panel cross member, the side panel beam and the A-pillar.

8. The vehicle body structure according to claim 5, wherein: The floor panel comprises: A front floor cross member, configured to protrude upward to connect the two side frame members; and The instrument panel floor connecting beam connects the instrument panel cross beam and the floor front cross beam along the front-rear direction of the vehicle body structure and supports the gap between the instrument panel cross beam and the floor front cross beam.

9. The vehicle body structure according to claim 1, further comprising a front subframe mounted on a lower side of the front side member, wherein: The rear end of the front subframe is supported by a front subframe mounting bracket on the underside of the instrument panel cross member.

10. A body structure for an electric vehicle, the body structure comprising: a floor panel covering the upper side of the battery accommodation space; an integral battery front cross beam disposed on the front lower side of the floor panel and covering the front portion of the battery accommodation space; an instrument panel cross member coupled to the floor panel and the integral battery front cross member; A front side beam, arranged at the front side of the instrument panel cross beam; a front side rear lower beam connecting a rear portion of the front side beam to the instrument panel cross beam; an integral battery rear cross beam disposed on the rear lower side of the floor panel and covering the rear portion of the battery accommodation space; A side frame beam connected to both ends of the integrated battery front cross beam and both ends of the integrated battery rear cross beam and covering a side portion of the battery accommodation space; A corner reinforcement beam, obliquely connected to the integrated battery rear cross beam and the side frame beam, and the corner reinforcement beam is arranged between the integrated battery rear cross beam and the side frame beam; as well as A battery lower module is coupled to the lower side of the integrated battery front cross beam, the lower side of the integrated battery rear cross beam and the lower side of the side frame beam, and the battery lower module covers the lower part of the battery accommodating space, wherein the battery lower module includes: a lower module external front cross beam coupled to the lower side of the integrated battery front cross beam; a lower module external rear cross member coupled to the lower side of the integrated battery rear cross member; a lower module outer side member coupled to a lower side of the side enclosure member; and A lower plate is coupled to a lower side of the lower module outer front beam, a lower side of the lower module outer rear beam, and a lower side of the lower module outer side beam to cover the lower portion of the battery receiving space.

11. The vehicle body structure according to claim 10, wherein: Each of the plurality of corner reinforcement beams includes a coupling flange which is integrally formed and protrudes toward the battery receiving space, and the coupling flange is configured to be coupled with a lower surface of the floor panel.

12. The vehicle body structure according to claim 10, wherein: The battery lower module includes a lower module outer corner beam, which is obliquely connected to the lower module outer rear cross beam and the lower module outer side beam on the lower side of a corresponding one of the plurality of corner reinforcement beams and between the lower module outer rear cross beam and the lower module outer side beam.

13. The vehicle body structure according to claim 12, wherein: The lower module outer front beam, the lower module outer rear beam, the lower module outer side beam and the lower module outer corner beam are connected to the integral battery front beam, the integral battery rear beam, the side frame beam and the corner reinforcement beam using gaskets, thereby defining a closed curve between these beams to seal the battery accommodating space.

14. The vehicle body structure according to claim 10, further comprising a rear side beam coupled to a rear end portion of a corresponding one of the plurality of side frame beams, wherein: The front end portion of the rear side member has a shape surrounding an upper side surface, a lower side surface, and a rear end portion of the side frame member.

15. The vehicle body structure according to claim 14, wherein: The side enclosure beam comprises a side enclosure beam lower rib, wherein the side enclosure beam lower rib and the lower module outer side beam define a groove opening downward; The rear side member includes a rear side partition wall portion extending from an upper side to a lower side to surround a rear end portion of the side frame member; and The rear side beam includes a partition wall flange portion, which surrounds the lower side of the side beam in a state where the partition wall flange portion is inserted into a groove defined by the side beam lower rib and the lower module outer side beam at a lower end portion of the rear side partition wall portion.

16. The vehicle body structure according to claim 14, wherein: The rear side member is coupled to support a rear portion of the corner reinforcement member and the side enclosure member.

17. The vehicle body structure according to claim 14, wherein: The floor panel includes a floor rear cross member protruding upward and connecting the two side frame beams; and The rear side beams are coupled to the floor rear cross beam.

18. The vehicle body structure according to claim 14, further comprising a rear subframe mounted on a lower side of the rear side member.

19. A body structure for an electric vehicle, the body structure comprising: a floor panel covering an upper side of the battery accommodation space, wherein a cross-sectional shape of the floor panel has a plurality of closed cross-sections, and a cross-sectional shape of the closed cross-sections extends in a lateral direction of the vehicle body structure; an integral battery front cross beam disposed on the front lower side of the floor panel and covering the front portion of the battery accommodation space; an instrument panel cross member coupled to the floor panel and the integral battery front cross member; A front side beam, arranged at the front side of the instrument panel cross beam; a front side rear lower beam connecting a rear portion of the front side beam to the instrument panel cross beam; an integrated battery rear cross beam disposed on a rear lower side of the floor panel and covering a rear portion of the battery accommodation space, wherein the integrated battery front cross beam and the integrated battery rear cross beam are integrally made with the floor panel to form a cross section protruding from a lower side of the floor panel; a side frame beam connected to both ends of the integrated battery front cross beam and both ends of the integrated battery rear cross beam and covering a side portion of the battery accommodation space; and A battery lower module is coupled to the lower side of the integrated battery front cross beam, the lower side of the integrated battery rear cross beam and the lower side of the side frame beam, and the battery lower module covers the lower portion of the battery accommodating space.

20. The vehicle body structure according to claim 19, wherein: A plurality of the floor panels are arranged along the front-rear direction of the electric vehicle and surround the upper side of the battery accommodation space in a planar manner; A first floor panel provided with the integrated battery front cross beam among the plurality of floor panels is integrally formed with a floor front cross beam protruding upward and connecting the two side beams; and The second floor panel provided with the integrated battery rear cross beam among the plurality of floor panels is integrally formed with the floor rear cross beam protruding upward and connecting the two side frame beams.

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