Battery pack frame structure, battery pack box body and vehicle

Abstract

The utility model provides a battery pack frame structure, battery pack box and vehicle relates to the technical field of vehicle, battery pack frame structure includes frame structure, auxiliary beam and partition beam, auxiliary beam and partition beam are respectively arranged in the accommodation cavity that the frame structure encloses, the frame structure includes first boundary beam, second boundary beam and third boundary beam, the second edge beam and the third edge beam are oppositely arranged at the two opposite ends of the first edge beam in the extending direction in a spaced mode, a cavity is formed in the auxiliary beam, the auxiliary beam is parallel to the extending direction of the first edge beam, and the different end faces of the auxiliary beam are fixedly connected with the first edge beam, the second edge beam and the third edge beam correspondingly; the end face, far away from the first edge beam, of the auxiliary beam is used for being attached to the end face of the battery cell in the thickness direction and fixedly connected with the separation beam. The battery pack frame structure disclosed by the utility model not only effectively enhances the strength of the battery pack box body, but also can reduce the situation that the frame structure of the battery pack box body is loosened or separated at the joint due to the expansion of the battery cells.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, and in particular to a battery pack frame structure, a battery pack box and a vehicle. Background Art

[0002] With the increasing popularity of electric vehicles, users have higher and higher requirements for the safety performance of electric vehicles, especially the safety performance of battery packs. The safety performance of the battery pack frame structure, as the external protection component of the battery pack, directly affects the safety performance of the entire battery pack.

[0003] At present, the frames of most battery pack frame structures are assembled by profile beams, and the battery cells are placed in the battery pack frames and in contact with the side beams of the battery pack frame structure. Since the battery cells expand and contract in the width direction during cyclic charge and discharge, the expansion force generated during the expansion process will act on the side beams in contact with the battery cells in the thickness direction. Over time, the connection between the side beam and other side beams may sometimes become loose or even separate, which not only poses a safety hazard but also reduces the overall strength of the battery pack frame structure. Utility Model Content

[0004] In order to solve at least one aspect of the above problems, the utility model provides a battery pack frame structure, a battery pack box and a vehicle.

[0005] In the first aspect, the utility model provides a battery pack frame structure, including a frame structure, an auxiliary beam and a partition beam, the auxiliary beam and the partition beam are respectively arranged in a accommodating cavity surrounded by the frame structure, the frame structure includes a first side beam, a second side beam and a third side beam, the second side beam and the third side beam are oppositely and spaced apart at opposite ends of the first side beam along the extension direction, a cavity is provided inside the auxiliary beam, the auxiliary beam is arranged parallel to the extension direction of the first side beam, different end faces of the auxiliary beam are respectively fixedly connected to the first side beam, the second side beam and the third side beam, and the end face of the auxiliary beam away from the first side beam is used to fit with the end face of the battery cell in the thickness direction and be fixedly connected to the partition beam.

[0006] Optionally, along the direction from the auxiliary beam to the first side beam, the width of the cavity is greater than or equal to one tenth of the thickness of the battery core;

[0007] And / or, along the penetrating direction of the accommodating cavity, the height of the first side beam is greater than or equal to two thirds of the height of the battery core.

[0008] Optionally, the battery pack frame structure further includes a connecting member, which is connected between an end surface of one side of the auxiliary beam close to the first side beam and an end surface of one side of the first side beam close to the auxiliary beam.

[0009] Optionally, the connecting member is a connecting beam, which is extended from the auxiliary beam to the first side beam, and opposite ends of the connecting beam along the extending direction are fixedly connected to the auxiliary beam and the first side beam respectively.

[0010] Optionally, the battery pack frame structure includes a plurality of the connecting members spaced apart along the extension direction of the auxiliary beam, and the connection positions of the plurality of the connecting members and the auxiliary beam are respectively arranged corresponding to the expansion parts of the end surfaces of the plurality of battery cells facing the auxiliary beam.

[0011] Optionally, the partition beam includes a first partition beam and a second partition beam, the first partition beam is arranged to intersect with the extension direction of the auxiliary beam, and the opposite ends of the first partition beam along the extension direction are respectively fixedly connected to the end surface of the auxiliary beam away from the first side beam and the second partition beam; the second partition beam is arranged parallel to the extension direction of the first side beam, and the opposite ends of the second partition beam along the extension direction are respectively fixedly connected to the second side beam and the third side beam.

[0012] Optionally, the shapes and sizes of the cross sections of the first partition beam, the second partition beam and the auxiliary beam are respectively the same.

[0013] Optionally, the partition beam further includes a third partition beam, a plurality of the second partition beams are arranged in parallel and at intervals, and the third partition beam is connected between two adjacent second partition beams.

[0014] In a second aspect, the utility model provides a battery pack case, comprising the battery pack frame structure as described above.

[0015] In a third aspect, the utility model provides a vehicle, comprising the battery pack box as described above.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] After the battery pack frame structure is assembled, the partition beam and the auxiliary beam are respectively arranged in the accommodating cavity surrounded by the frame structure, and the partition beam can divide the accommodating cavity into at least two battery cell storage areas. The second side beam and the third side beam of the frame structure are opposite to and spaced at opposite ends of the first side beam along the extension direction, and the auxiliary beam is arranged parallel to the extension direction of the first side beam. Different end faces of the auxiliary beam are respectively fixedly connected to the first side beam, the second side beam and the third side beam, and the end face of the auxiliary beam away from the first side beam is used to fit with the end face of the battery cell in the thickness direction and be fixedly connected to the partition beam. In this way, when the battery cell is working, the expansion force generated by the expansion of the end face in the thickness direction can be transmitted to the auxiliary beam. Since the auxiliary beam is provided with a cavity inside, part of the expansion force can be absorbed by the deformation of the cavity of the auxiliary beam. Moreover, since different end faces of the auxiliary beam are respectively fixedly connected to the first side beam, the second side beam and the third side beam, and the end face of the auxiliary beam away from the first side beam is fixedly connected to the partition beam, the expansion force transmitted to the first side beam, the second side beam and the third side beam is effectively weakened, thereby effectively reducing the possibility of the first side beam, the second side beam and the third side beam becoming loose or broken at the connection due to excessive expansion force. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structure of the battery pack frame structure of the embodiment of the utility model is shown in FIG. Figure 1 ;

[0019] Figure 2 It is a schematic diagram of the assembly of the battery pack frame structure and the battery cell according to an embodiment of the utility model;

[0020] Figure 3 The structure of the battery pack frame structure of the embodiment of the utility model is shown in FIG. Figure 2 ;

[0021] Figure 4 The structure of the battery pack frame structure of the embodiment of the utility model is shown in FIG. Figure 3 .

[0022] Description of reference numerals:

[0023] 1. Frame structure; 11. First side beam; 12. Second side beam; 13. Third side beam; 14. Fourth side beam; 2. Auxiliary beam; 3. Partition beam; 31. First partition beam; 32. Second partition beam; 33. Third partition beam; 4. Battery cell; 5. Connector. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0026] Moreover, the Z-axis in the accompanying drawings represents the vertical direction, that is, the up and down position, and the positive direction of the Z-axis (that is, the direction of the arrow of the Z-axis) represents the top, and the negative direction of the Z-axis represents the bottom; the X-axis in the accompanying drawings represents the longitudinal direction, that is, the front and back position, and the positive direction of the X-axis (that is, the direction of the arrow of the X-axis) represents the front, and the negative direction of the X-axis represents the back; the Y-axis in the accompanying drawings represents the horizontal direction, that is, the left and right position, and the positive direction of the Y-axis (that is, the direction of the arrow of the Y-axis) represents the right, and the negative direction of the Y-axis represents the left.

[0027] It should also be noted that the aforementioned Z-axis, X-axis and Y-axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] like Figure 1 , 2 As shown, the battery pack frame structure of the embodiment of the utility model includes a frame structure 1, an auxiliary beam 2 and a partition beam 3. The auxiliary beam 2 and the partition beam 3 are respectively arranged in the accommodating cavity surrounded by the frame structure 1. The frame structure 1 includes a first side beam 11, a second side beam 12 and a third side beam 13. The second side beam 12 and the third side beam 13 are oppositely and spaced apart at opposite ends of the first side beam 11 along the extension direction. A cavity is provided inside the auxiliary beam 2. The auxiliary beam 2 is arranged parallel to the extension direction of the first side beam 11. Different end faces of the auxiliary beam 2 are respectively fixedly connected to the first side beam 11, the second side beam 12 and the third side beam 13, and the end face of the auxiliary beam 2 away from the first side beam 11 is used to fit with the end face of the battery cell 4 in the thickness direction and be fixedly connected to the partition beam 3.

[0029] Specifically, the first side beam 11, the second side beam 12, the third side beam 13 and the auxiliary beam 2 can all be regarded as long plate-like structures, or in other words, can be regarded as slender rectangular parallelepiped structures, and the direction of the long side can be defined as the overall extension direction of the beam body, for example, Figure 1As shown, the first side beam 11 and the auxiliary beam 2 can be regarded as extending in the direction of the Y axis, and the second side beam 12 and the third side beam 13 can be regarded as extending in the direction of the X axis. In addition, when the first side beam 11 and the auxiliary beam 2 are cross-sectioned along the XZ plane, and the second side beam 12 and the third side beam 13 are cross-sectioned along the YZ plane, since all four are long plate-like structures, their projection surface or cross-sectional profile is rectangular at this time, and the direction of their long sides can be defined as the overall extension direction of the rectangle, as shown in FIG. Figure 1 As shown, the projections of the first side beam 11 , the second side beam 12 , the third side beam 13 and the auxiliary beam 2 can all be considered to extend along the Z axis.

[0030] like Figure 1 As shown, the partition beam 3 and the auxiliary beam 2 are respectively arranged in the accommodating cavity surrounded by the frame structure 1, and the partition beam 3 can divide the accommodating cavity into at least two battery cell storage areas. The second side beam 12 and the third side beam 13 of the frame structure 1 are oppositely and spaced apart at the opposite ends of the first side beam 11 along the extension direction. The auxiliary beam 2 is arranged parallel to the extension direction of the first side beam 11, and the opposite end surfaces of the auxiliary beam 2 in the direction of the Y-axis are respectively connected to the second side beam 12 and the third side beam 13, and the opposite end surfaces of the auxiliary beam 2 in the direction of the X-axis are respectively fixedly connected to the first side beam 11 and the auxiliary beam 2, and the end surface of the auxiliary beam 2 away from the first side beam 11 is used to fit with the end surface of the battery cell 4 in the thickness direction and be fixedly connected to the partition beam 3.

[0031] It should be understood that the battery cell 4 is a hexahedral structure, wherein the two end faces along the thickness direction of the battery cell 4 have the largest area. During the cycle charge and discharge process of the battery cell 4, it will expand and contract, and its main expansion direction is along the thickness direction of the battery cell 4, that is, Figure 1 In the direction of the X-axis, therefore, the two end faces of the battery core 4 in the thickness direction will expand and deform.

[0032] In this way, when the battery cell 4 is working, the expansion force generated by the expansion of the end face in the thickness direction can be transmitted to the auxiliary beam 2. Since the auxiliary beam 2 is provided with a cavity inside, part of the expansion force can be absorbed by the deformation of the cavity of the auxiliary beam 2. Moreover, since different end faces of the auxiliary beam 2 are respectively fixedly connected to the first side beam 11, the second side beam 12 and the third side beam 13, and the end face of the auxiliary beam 2 away from the first side beam 11 is fixedly connected to the partition beam 3, the expansion force transmitted to the first side beam 11, the second side beam 12 and the third side beam 13 is effectively weakened, thereby effectively reducing the loosening or breakage of the first side beam 11, the second side beam 12 and the third side beam 13 at the connection due to excessive expansion force.

[0033] At the same time, when the battery cell 4 is offset in the direction of the Y-axis in the battery pack case, the center of gravity of the battery pack case will be offset in the direction of the Y-axis, thereby increasing the force on one end of the first side beam 11 along the extension direction. The auxiliary beam 2 in this embodiment can be connected to the first side beam 11, such as the rear side beam of the battery pack case, thereby increasing the bending strength of the first side beam 11, thereby effectively improving the overall bending strength of the battery pack frame.

[0034] In this embodiment, the connection method of the auxiliary beam 2 with the first side beam 11, the second side beam 12, the third side beam 13 and the partition beam 3 includes but is not limited to welding, bolt connection or rivet connection, etc. There is no limitation here, and it depends on actual needs.

[0035] Optionally, on a plane perpendicular to the extension direction of the auxiliary beam 2 , the projection of the auxiliary beam 2 is extended along a first direction, and the first direction is parallel to the penetrating direction of the accommodating cavity.

[0036] In this embodiment, the accommodating cavity surrounded by the frame structure 1 is arranged to penetrate along the Z-axis direction, that is, the penetration direction of the accommodating cavity is as follows: Figure 1 The direction is shown by the Z axis.

[0037] like Figure 1 As shown, the auxiliary beam 2 is extended along the Y-axis direction, and on the XZ plane, the projection of the auxiliary beam 2 is extended along the Z-axis direction. That is to say, the projection shape of the auxiliary beam 2 on the XZ plane is a rectangle. In this way, the auxiliary beam 2 is larger in the direction of the Z-axis to increase the contact area with the battery cell 4 and the connection area with the first side beam 11 and the partition beam 3.

[0038] Optionally, along the direction from the auxiliary beam 2 to the first side beam 11, the width of the cavity is greater than or equal to one tenth of the thickness of the battery cell 4;

[0039] And / or, along the penetrating direction of the accommodating cavity, the height of the first side beam 11 is greater than or equal to two thirds of the height of the battery core 4 .

[0040] In this embodiment, the auxiliary beam 2 and the first side beam 11 are arranged in parallel in the X-axis direction, that is, the direction from the auxiliary beam 2 to the first side beam 11 is as follows: Figure 1 The X-axis direction is shown.

[0041] It should be understood that the expansion size range of the battery cell 4 along the X-axis direction is usually 3% to 5% of the thickness of the battery cell 4. In order to ensure that the auxiliary beam 2 can absorb energy through cavity deformation, the width of the cavity along the X-axis direction is greater than or equal to one tenth of the thickness of the battery cell 4.

[0042] At the same time, in order to ensure the overall rigidity of the battery module during the cyclic charging and discharging process of the battery cell 4 , the height of the first side beam 11 along the Z-axis direction is greater than or equal to two-thirds of the height of the battery cell 4 .

[0043] Optionally, the battery pack frame structure further includes a connecting member 5 , which is connected between an end surface of one side of the auxiliary beam 2 close to the first side beam 11 and an end surface of one side of the first side beam 11 close to the auxiliary beam 2 .

[0044] In this embodiment, the connecting member 5 can be a profile beam, a stamping part or a connecting block, etc., wherein the connecting member 5 can be a separate component or can be made integrally with the first side beam 11 or the auxiliary beam 2. There is no limitation here, and it depends on actual needs.

[0045] It can be understood that the end face of the battery cell 4 facing the auxiliary beam 2 is parallel to the YZ plane, and the expansion part of the end face refers to the middle part of the end face in the Y direction. In this embodiment, the battery pack frame structure includes a plurality of connectors 5 arranged at intervals along the extension direction of the auxiliary beam 2, and the connection positions of the plurality of connectors 5 and the auxiliary beam 2 are respectively arranged corresponding to the expansion parts of the end faces of the plurality of battery cells 4 facing the auxiliary beam 2, that is, along the X-axis direction, the expansion part of each battery cell 4 can correspond to a connector 5. In this way, when the battery cell 4 expands, the connector 5 plays a supporting role, which can reduce the tension at the connection between the auxiliary beam 2 and the second side beam 12 and the third side beam 13.

[0046] In one embodiment, the connecting member 5 is a connecting beam, which is extended from the auxiliary beam 2 to the first side beam 11 , and opposite ends of the connecting beam along the extending direction are fixedly connected to the auxiliary beam 2 and the first side beam 11 , respectively.

[0047] like Figure 3 As shown, the connecting beam is extended along the X-axis direction and arranged between the auxiliary beam 2 and the first side beam 11, and the two opposite ends of the connecting beam along the X-axis direction are respectively vertically connected to the auxiliary beam 2 and the first side beam 11. In this way, the structural strength of the battery pack frame as a whole can be enhanced by the connecting beam.

[0048] Furthermore, a cavity is also provided in the connecting beam, so that while the strength of the battery pack frame structure is enhanced by the connecting beam, the lightweight requirement can be met.

[0049] Optionally, the partition beam 3 includes a first partition beam 31 and a second partition beam 32, the first partition beam 31 is arranged to intersect with the extension direction of the auxiliary beam 2, and the opposite ends of the first partition beam 31 along the extension direction are respectively fixedly connected to the end surface of the auxiliary beam 2 away from the first side beam 11 and the second partition beam 32; the second partition beam 32 is arranged parallel to the extension direction of the first side beam 11, and the opposite ends of the second partition beam 32 along the extension direction are respectively fixedly connected to the second side beam 12 and the third side beam 13.

[0050] like Figure 1 As shown, the extension direction of the first partition beam 31 is parallel to the direction of the X-axis, that is, the first partition beam 31 is arranged perpendicular to the extension direction of the auxiliary beam 2, and the opposite ends of the first partition beam 31 along the direction of the X-axis are respectively fixedly connected to the end surface of the auxiliary beam 2 away from the first side beam 11 and the second partition beam 32; the extension direction of the second partition beam 32 is parallel to the direction of the Y-axis, that is, the second partition beam 32 is arranged parallel to the extension direction of the first side beam 11, and the opposite ends of the second partition beam 32 along the direction of the Y-axis are respectively fixedly connected to the second side beam 12 and the third side beam 13. In this way, when the battery cell 4 expands, the first partition beam 31 and the second partition beam 32 can absorb the expansion force transmitted to the auxiliary beam 2 in the X-axis direction.

[0051] Optionally, the cross-sectional shapes and sizes of the first partition beam 31, the second partition beam 32 and the auxiliary beam 2 are respectively the same. In this way, during production, only one type of beam body with a cross section is required, and then the beam body is cut into the first partition beam 31, the second partition beam 32 or the auxiliary beam 2 according to actual needs, thereby increasing the universality of the beam body.

[0052] In this embodiment, Figure 4 As shown, the partition beam 3 also includes a third partition beam 3, a plurality of second partition beams 32 are provided, the plurality of second partition beams 32 are arranged in parallel and at intervals, and the third partition beam 3 is connected between two adjacent second partition beams 32. In this way, the third partition beam 3 can not only separate more battery cell installation areas, but also enhance the strength of the battery pack frame structure.

[0053] In this embodiment, Figure 1 As shown, the frame structure 1 also includes a fourth side beam 14, which is spaced apart and parallel to the first side beam 11, the second side beam 12 and the third side beam 13 are opposite and spaced apart at opposite ends of the fourth side beam 14 along the extension direction, and the fourth side beam 14 is spaced apart from the nearest third dividing beam 3 so that components such as an inverter and a controller can be installed in the space between the two.

[0054] A battery pack case according to another embodiment of the present invention includes the battery pack frame structure as described above.

[0055] In this embodiment, the battery pack box and the above-mentioned battery pack frame structure have the same beneficial effects relative to the prior art, so they will not be described in detail here.

[0056] A vehicle according to another embodiment of the present invention comprises the battery pack box as described above.

[0057] In this embodiment, the vehicle and the above-mentioned battery pack frame structure have the same beneficial effects relative to the prior art, so they will not be repeated here.

[0058] The reader should understand that in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0059] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A battery pack frame structure, characterized in that: The invention comprises a frame structure (1), an auxiliary beam (2) and a partition beam (3), wherein the auxiliary beam (2) and the partition beam (3) are respectively arranged in a receiving cavity surrounded by the frame structure (1), wherein the frame structure (1) comprises a first side beam (11), a second side beam (12) and a third side beam (13), wherein the second side beam (12) and the third side beam (13) are arranged opposite to and spaced apart at two opposite ends of the first side beam (11) along an extension direction, wherein a cavity is arranged inside the auxiliary beam (2), wherein the auxiliary beam (2) is arranged parallel to the extension direction of the first side beam (11), wherein different end faces of the auxiliary beam (2) are respectively fixedly connected to the first side beam (11), the second side beam (12) and the third side beam (13), and the end face of the auxiliary beam (2) away from the first side beam (11) is used to fit with the end face of the battery cell (4) in the thickness direction and to be fixedly connected to the partition beam (3).

2. The battery pack frame structure according to claim 1, characterized in that: Along the direction from the auxiliary beam (2) to the first side beam (11), the width of the cavity is greater than or equal to one tenth of the thickness of the battery core (4); And / or, along the penetrating direction of the accommodating cavity, the height of the first side beam (11) is greater than or equal to two thirds of the height of the battery core (4).

3. The battery pack frame structure according to claim 1, characterized in that: It also comprises a connecting member (5), wherein the connecting member (5) is connected between an end face of one side of the auxiliary beam (2) close to the first side beam (11) and an end face of one side of the first side beam (11) close to the auxiliary beam (2).

4. The battery pack frame structure according to claim 3, characterized in that: The connecting member (5) is a connecting beam, which is extended in the direction from the auxiliary beam (2) to the first side beam (11), and the opposite ends of the connecting beam along the extension direction are respectively fixedly connected to the auxiliary beam (2) and the first side beam (11).

5. The battery pack frame structure according to claim 3, characterized in that: It comprises a plurality of connecting members (5) arranged at intervals along the extension direction of the auxiliary beam (2), wherein the connection positions of the plurality of connecting members (5) and the auxiliary beam (2) are respectively arranged corresponding to the expansion positions of the end faces of the plurality of battery cells (4) facing the auxiliary beam (2).

6. The battery pack frame structure according to claim 1, characterized in that: The partition beam (3) comprises a first partition beam (31) and a second partition beam (32); the first partition beam (31) intersects with the extension direction of the auxiliary beam (2); two ends of the first partition beam (31) along the extension direction are respectively fixedly connected to the end surface of the auxiliary beam (2) away from the first side beam (11) and the second partition beam (32); the second partition beam (32) is parallel to the extension direction of the first side beam (11); two ends of the second partition beam (32) along the extension direction are respectively fixedly connected to the second side beam (12) and the third side beam (13).

7. The battery pack frame structure according to claim 6, characterized in that: The cross-sectional shapes and sizes of the first partition beam (31), the second partition beam (32) and the auxiliary beam (2) are respectively the same.

8. The battery pack frame structure according to claim 6 or 7, characterized in that: The partition beam (3) further comprises a third partition beam (33), a plurality of the second partition beams (32) are arranged in parallel and at intervals, and the third partition beam (33) is connected between two adjacent second partition beams (32).

9. A battery pack box, characterized in that: Comprising a battery pack frame structure as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising a battery pack case as described in claim 9.

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