Bottom guard plate, battery pack and vehicle

Abstract

The present disclosure relates to a bottom protection plate, a battery pack and a vehicle. The plate body of the bottom protection plate has a center point and at least one center line passing through the center point, and the plate body has the same height at the position of the at least one center line and the center point, wherein the at least one center line divides the bottom protection plate into multiple regions symmetrical with respect to the center point in space, and in each region, the height of the plate body gradually decreases from the center point to the outside direction. Through the above technical solution, the plate body of the bottom protection plate has the same height at the position of the at least one center line and the center point, which forms a rigid support at the position of the center line for inhibiting the collapse of the bottom protection plate, thereby meeting the overall flatness requirement and the local wave deformation requirement of the bottom protection plate.

Description

Technical Field

[0001] This disclosure relates to the field of new energy technology, and in particular to a bottom protection plate, a battery pack, and a vehicle. Background Technology

[0002] In large-flat steel forming processes, such as the stamping process for battery pack bottom plates, traditional techniques often employ a compensatory design where the center of the mold is higher and the edges are lower relative to the center, attempting to reduce collapse caused by the material's own weight. However, this approach, lacking effective support and constraint for the plate, struggles to meet the requirements for overall flatness and localized wave deformation of the bottom plate. Utility Model Content

[0003] To overcome the problems existing in the related technologies, this disclosure provides a bottom protection plate, a battery pack, and a vehicle.

[0004] According to a first aspect of the present disclosure, a bottom guard plate is provided, the plate body having a center point and at least one center line passing through the center point, the plate body having the same height at the positions of the at least one center line and the center point, wherein the at least one center line spatially divides the bottom guard plate into a plurality of regions symmetrical with respect to the center point, and in each region, the height of the plate body gradually decreases from the center point outwards.

[0005] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects: The bottom protective plate provided by this disclosure has a plate height that gradually decreases from the center point to the outside in multiple areas divided by the center line. This compensation for the height of the middle part of the plate can prevent collapse caused by the material's own weight during the forming process of the bottom protective plate. At the same time, the plate of the bottom protective plate has the same height at at least one center line and the center point, which makes a rigid support formed at the center line to suppress the collapse of the bottom protective plate, thereby meeting the overall flatness requirements and local wave deformation requirements of the bottom protective plate.

[0006] In some possible implementations, the centerline includes a longitudinal centerline and a transverse centerline passing through the center point, which spatially divide the bottom liner into four symmetrical regions relative to the center point. The longitudinal and transverse centerlines work together to enhance the rigidity of the bottom liner from two mutually perpendicular dimensions. This not only improves the bottom liner's ability to suppress collapse deformation but also helps to evenly distribute stress, meeting the overall flatness requirements and local wave deformation requirements of the bottom liner.

[0007] In some possible implementations, within each region, the height of the plate gradually decreases from the center point towards the four corners of the bottom protective plate. During the locking process, the corners generate an upward arching force due to the gradual change in height, pulling the overall plane of the bottom protective plate upward and preventing the plate from collapsing.

[0008] In some possible implementations, the height difference between the center point and the corner position ranges from 5 mm to 50 mm. Within this height difference range, it is beneficial to suppress local deformation and ensure that the overall flatness meets the requirements.

[0009] In some possible implementations, the outer edge of the bottom protective plate is provided with a flange edge. This flange edge is used to abut against the battery pack housing frame after the bottom protective plate is installed. One side of the flange edge is connected to the bottom protective plate body, and the other side forms a cantilever end, which curves upwards relative to the horizontal plane. This upward curve of the cantilever end relative to the horizontal plane generates an upward arching force after the bottom protective plate is installed in the battery pack housing frame, pulling the overall plane of the bottom protective plate upwards and preventing the plate from collapsing.

[0010] In some possible implementations, the angle between the flange edge and the horizontal plane is 0° to 15°. Within this angle range, the flange edge can generate an appropriate amount of upward arching force after installation to flatten the overall plane of the bottom protective plate and ensure flatness, while also maintaining a tight fit with the battery pack housing frame through moderate deformation, enhancing connection stability and reliability.

[0011] In some possible implementations, the flange edge and the bottom guard plate have a rounded transition. This allows stress to be evenly distributed at the connection, reducing the problem of excessive local stress caused by the fastening operation.

[0012] In some possible implementations, the bottom guard plate is a one-piece structure formed by thermoforming. This design achieves both high strength and lightweight.

[0013] According to a second aspect of the present disclosure, a battery pack is provided, including a bottom protective plate of any of the above.

[0014] According to a third aspect of the present disclosure, a vehicle is provided that includes a battery pack comprising any of the foregoing embodiments.

[0015] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0017] Figure 1 This is a perspective view of a bottom guard plate according to an exemplary embodiment.

[0018] Figure 2 This is a front view of a bottom guard plate according to an exemplary embodiment.

[0019] Figure 3 This is a partially enlarged view of a bottom guard plate at the flange edge position according to an exemplary embodiment. Detailed Implementation

[0020] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0021] After stamping, steel attempts to partially recover its original shape due to the release of internal elastic stress. The rigid support points of large planar components are mainly at the edges, lacking effective constraint in the central area, resulting in significant springback and manifesting as central collapse. If such deformed stamped components are applied to the bottom guard plate of a battery pack, the uneven bottom guard plate cannot evenly distribute external impact forces. Furthermore, as a crucial support structure for the battery pack, the unevenness of the bottom guard plate leads to an unbalanced distribution of stress points at the bottom of the battery, causing some areas to experience excessive compressive stress. Related technologies compensate for the springback deformation in the central region of the part by machining the working surface of the die with a slight curve opposite to the expected springback direction.

[0022] like Figures 1 to 3 The present disclosure provides a bottom protective plate 100. The bottom protective plate 100 is typically disposed below the battery pack housing frame to protect the individual battery cells within the battery pack. Specifically, the bottom protective plate 100 provided in this disclosure has a center point O and at least one center line passing through the center point O. The plate 1 has the same height at the positions of the at least one center line and the center point O. The at least one center line spatially divides the bottom protective plate 100 into multiple regions symmetrical with respect to the center point O. In each region, the height of the plate 1 gradually decreases from the center point O outwards.

[0023] The center point O of the bottom guard plate 100 is also the geometric center point of the bottom guard plate 100. For ease of understanding, the center point O is set as the reference point, and the height of the plate body 1 of the bottom guard plate 100 at the center point O is the reference height. Specifically, the plate body 1 has the same height as the center point O at at least one centerline; that is, the height of the plate body 1 remains constant along the centerline starting from the center point O, and the height of the plate body 1 along the centerline is also at the reference height.

[0024] At least one centerline divides the bottom protective plate 100 into multiple symmetrical regions relative to the center point O. In each region, the height of the plate 1 gradually decreases from the center point O outwards. That is, in each region, except for the centerline itself, all other positions are lower than the center point O, or lower than the reference height. Using the center point O of the plate 1 as the reference point, the four corners are supplemented downwards, which makes the bottom protective plate more evenly stressed and improves its overall flatness when the battery pack is installed. Conversely, if the reference point shifts, the overall flatness cannot be guaranteed, resulting in uneven stress distribution.

[0025] The bottom protective plate 100 provided in this disclosure can be either a cold-pressed or hot-pressed integral structure. Hot-pressed materials offer advantages in balancing high strength and lightweight. However, considering that the toughness of hot-pressed steel is weakened, making it more prone to collapse, higher requirements are placed on meeting the requirements for overall flatness and localized wave deformation.

[0026] The bottom protective plate 100 disclosed herein has a height that gradually decreases from the center point O outwards. This compensation for the height of the middle part of the plate 1 prevents collapse due to the material's own weight during the forming process of the bottom protective plate 100. Simultaneously, the plate 1 of the bottom protective plate 100 has the same height at at least one centerline and the center point O, creating a rigid support at the centerline to suppress the collapse of the bottom protective plate 100. This can be figuratively understood as "holding back" the collapsing plate through rigid support, thus meeting the overall flatness requirements and local wave deformation requirements of the bottom protective plate 100.

[0027] Furthermore, in some application scenarios, considering the battery pack's ground clearance or the requirement in bottom ball impact tests to ensure that the bottom protective plate 100 does not puncture the battery pack housing after deformation, it is impossible to add reinforcing ribs, which will adversely affect the overall flatness and local wave deformation of the bottom protective plate 100. However, the bottom protective plate 100 of this disclosure, by forming a rigid support at the center line position, can still meet the requirements for overall flatness and local wave deformation of the bottom protective plate 100 even without adding reinforcing ribs.

[0028] This disclosure does not limit the number of center lines; there can be one, two, or more, thereby dividing the plate 1 into a number of symmetrical regions. In some possible embodiments, such as Figure 2 As shown, the centerline includes a longitudinal centerline 11 and a transverse centerline 12 passing through the center point O. The longitudinal centerline 11 and the transverse centerline 12 divide the bottom protective plate 100 into four spatially symmetrical regions relative to the center point O. The bottom protective plate 100 is typically constructed as a roughly rectangular shape. These two mutually perpendicular centerlines act like intersecting reinforcing ribs, constructing a stable cross-shaped rigid support within the bottom protective plate 100. During the molding process of the bottom protective plate 100, when the material collapses due to its own weight, the longitudinal centerline 11 provides rigid support in the longitudinal direction, while the transverse centerline 12 provides support in the transverse direction. The two work together to enhance the rigidity of the bottom protective plate 100 from two mutually perpendicular dimensions. This not only improves the bottom protective plate 100's ability to suppress collapse deformation but also helps to evenly distribute stress, meeting the overall flatness requirements and local wave deformation requirements of the bottom protective plate 100.

[0029] In other embodiments, continue to refer to Figure 2 As indicated by the arrows, within each region, the height of the plate 1 gradually decreases from the center point O towards the four corners of the bottom protective plate 100. Mounting holes 3 are typically provided at the four corners of the bottom protective plate 100 for securing it to the battery pack frame. This disclosure, by gradually decreasing the height of the plate 1 from the center point O towards the four corners of the bottom protective plate 100, creates an upward arching force at the corners during the securing process, pulling the entire plane of the bottom protective plate 100 upwards and thus preventing the plate from collapsing. This differs from existing technologies that compensate for height loss along the four sides of the bottom protective plate 100, making it more difficult to prevent the entire plate from collapsing.

[0030] Optionally, the height difference between the center point O and the corner position can be between 5 mm and 50 mm. Within this range, it helps to suppress local deformation and ensure that the overall flatness meets the requirements. When the height difference is less than a reasonable range, the height of plate 1 from the center point O to the corner is insufficiently compensated; while when the height difference is too large, the deformation of different parts of plate 1 varies greatly, which may increase the risk of wave deformation.

[0031] In some possible implementations, such as Figure 1 and Figure 3As shown, a flange 2 is provided on the outer edge of the bottom protective plate 100. The flange 2 is used to abut against the battery pack housing frame after the bottom protective plate 100 is installed. One side of the flange 2 is connected to the plate body of the bottom protective plate 100, and the other side forms a cantilever end, which is tilted upward relative to the horizontal plane. The bottom protective plate 100 is provided with mounting holes 3 to facilitate the installation of the bottom protective plate 100 to the battery pack housing frame by bolts. This disclosure does not limit the position of the mounting holes 3. For example, the mounting holes 3 can be symmetrically designed to ensure uniform force distribution. The fact that one side of the flange 2 is connected to the plate body of the bottom protective plate 100, and the other side forms a cantilever end, gives the flange 2 the ability to elastically deform. The upward tilt of the cantilever end relative to the horizontal plane generates an upward arching force after the bottom protective plate 100 is installed to the battery pack housing frame, pulling the overall plane of the bottom protective plate 100 upward and preventing the plate body 1 from collapsing.

[0032] The included angle α between flange edge 2 and the horizontal plane can be 0° to 15°. Within the included angle range of 0° to 15°, flange edge 2 can generate an appropriate amount of upward arching force after installation to flatten the overall plane of bottom guard plate 100 and ensure flatness, and can also maintain a tight fit with the battery pack box frame through appropriate deformation, thereby enhancing connection stability and reliability.

[0033] In addition, such as Figure 3 As shown, there is a rounded transition between the flange edge 2 and the plate body 100. The rounded transition between the flange edge 2 and the plate body 1 allows the stress to be evenly distributed at the connection when the bottom plate body 100 is locked to the battery pack housing frame, reducing the problem of excessive local stress caused by the locking operation, reducing the risk of structural damage, and ensuring a stable connection between the bottom plate body 1 and the battery pack housing frame.

[0034] According to a second aspect of the present disclosure, a battery pack is provided, including the bottom protective plate of any of the above embodiments, and having all the beneficial effects thereof, which will not be repeated here.

[0035] According to a third aspect of the present disclosure, a vehicle is also provided, including the battery pack of any of the above.

[0036] It should be understood that spatial relative terms, such as “above,” “upper,” “below,” and “lower,” are used herein to describe the relationship between one element and another shown in the figures. In addition to the orientation depicted in the figures, these spatial relative terms are also intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as “above” or “upper” relative to another element would be “below” or “lower” relative to that other element. Thus, depending on the spatial orientation of the device, the term “above” encompasses both above and below orientations. Devices may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

Claims

1. A bottom protective plate, characterized in that, The bottom protective plate has a center point and at least one center line passing through the center point. The plate has the same height at the positions of the at least one center line and the center point. The at least one center line divides the bottom protective plate into multiple regions symmetrical with respect to the center point in space. In each region, the height of the plate gradually decreases from the center point outwards.

2. The bottom protective plate according to claim 1, characterized in that, The centerline includes a longitudinal centerline and a transverse centerline passing through the center point, which divide the bottom guard plate into four regions symmetrical with respect to the center point in space.

3. The bottom protective plate according to claim 2, characterized in that, Within each region, the height of the plate gradually decreases from the center point toward the four corners of the bottom protective plate.

4. The bottom protective plate according to claim 3, characterized in that, The height difference between the center point and the corner position ranges from 5 mm to 50 mm.

5. The bottom protective plate according to any one of claims 1-4, characterized in that, The outer edge of the bottom guard plate is provided with a flange edge, which is used to abut against the battery pack housing frame after the bottom guard plate is installed on the battery pack housing frame. One side of the flange edge is connected to the plate body of the bottom guard plate, and the other side forms a cantilever end, which is raised upward relative to the horizontal surface.

6. The bottom protective plate according to claim 5, characterized in that, The angle between the flange edge and the horizontal plane is 0°~15°.

7. The bottom protective plate according to claim 5, characterized in that, The flange edge and the bottom protective plate body have a rounded transition.

8. The bottom protective plate according to claim 1, characterized in that, The bottom protective plate is a one-piece structure formed by hot pressing.

9. A battery pack, characterized in that, Includes the bottom guard plate as described in any one of claims 1-8.

10. A vehicle, characterized in that, Includes the battery pack as described in claim 9.

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