Bottom protection plate, battery box and battery pack

Abstract

The utility model relates to the technical field of batteries, and provides a bottom protection plate, a battery box and a battery pack. The bottom protection plate comprises a bottom plate, a top plate and a polystyrene foam layer. The top plate and the bottom plate are arranged at intervals. And the polystyrene foam layer is arranged between the bottom plate and the top plate. Wherein at least one of the bottom plate and the top plate is provided with a protruding part extending towards the other one of the bottom plate and the top plate. The bottom protection plate of a double-layer sandwich structure is formed in the mode that the polystyrene foam layer is clamped between the bottom plate and the top plate, the structural strength of the bottom protection plate is large, and the mechanical rigidity of the whole bag is guaranteed. The bottom plate and the top plate can be directly bonded through the polystyrene foam layer, rapid forming of the bottom protection plate can be achieved, the bonding area can be increased through the protruding parts, foaming gaps can be filled, and the overall bonding performance is ensured. Therefore, the technical problems of insufficient strength and inconvenient forming of the bottom guard plate can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a bottom guard plate, a battery box and a battery pack. Background Art

[0002] In the related art, the bottom guard plate of the battery pack box is usually made of sheet metal structure, aluminum extrusion profile or composite sheet. The bottom guard plate of the sheet metal structure has a simple structure but low strength. If the chassis is bumped during the driving of the vehicle, it is easy to cause the airtightness of the entire battery pack to be poor. In severe cases, it may cause the battery pack to catch fire and explode. The bottom guard plate of the aluminum extrusion profile is generally a double-layer structure with good structural strength, but the molding process requires the use of stir friction welding and other welding methods to weld multiple profiles into shape, which makes the production cost high and the production efficiency low. The bottom guard plates of composite sheets are mostly made of special materials, and their processes are complicated and the cost is high. Utility Model Content

[0003] The embodiments of the utility model provide a bottom guard plate, a battery box and a battery pack, which can improve the technical problems of insufficient strength and inconvenient molding of the bottom guard plate.

[0004] In a first aspect, an embodiment of the present utility model provides a bottom guard plate, comprising:

[0005] Base plate;

[0006] A top plate, spaced apart from the bottom plate;

[0007] A foam rubber layer is provided between the bottom plate and the top plate;

[0008] Wherein, at least one of the bottom plate and the top plate is configured with a protrusion extending toward the other.

[0009] In one embodiment, the protrusion is provided on a side of the top plate facing the bottom plate, wherein the protrusion is spaced apart from the bottom plate, or the protrusion is in contact with the bottom plate.

[0010] In one embodiment, the protrusion is provided on a side of the bottom plate facing the top plate, wherein the protrusion is spaced apart from the top plate, or the protrusion is in contact with the top plate.

[0011] In one embodiment, the base plate comprises:

[0012] A plate body, spaced apart from the top plate;

[0013] An extension portion is disposed around the edge of the plate body, and the extension portion extends toward the bottom plate;

[0014] A connecting portion, arranged around a side of the extending portion away from the plate body, the connecting portion being connected to the top plate;

[0015] The plate body, the extension part, the connection part and the top plate are enclosed to form a cavity, and the foam rubber layer is filled in the cavity.

[0016] In one embodiment, the height of the cavity is 5 mm to 6 mm, and the height of the protrusion is 2 mm to 3 mm.

[0017] In one embodiment, the extension portion and the plate body are disposed at an obtuse angle, and the extension portion and the connecting portion are also disposed at an obtuse angle.

[0018] In one embodiment, the bottom plate is an aluminum plate, and the thickness of the bottom plate is 0.8 mm to 1.2 mm; the top plate is a steel plate, and the thickness of the top plate is 0.6 mm to 1 mm.

[0019] In one embodiment, the protrusions are provided in at least two portions, and at least two of the protrusions are spaced apart and distributed on the bottom plate or the top plate.

[0020] In a second aspect, an embodiment of the utility model provides a battery box, which includes the aforementioned bottom guard plate.

[0021] In a third aspect, an embodiment of the present utility model provides a battery pack, which includes the aforementioned battery box.

[0022] Beneficial effects of the embodiments of the utility model:

[0023] In the embodiment of the utility model, a double-layer sandwich structure bottom guard plate is formed by sandwiching a foam layer between a bottom plate and a top plate, so that the structural strength of the bottom guard plate is large and the mechanical rigidity of the whole package is ensured. The foam layer has a large strength and a good heat insulation and noise reduction effect, and can effectively buffer and protect the bottom guard plate when it is hit. The foam layer can also directly bond the bottom plate and the top plate, so that the bottom guard plate can be quickly formed. The protrusion can increase the bonding area and fill the foaming gap to ensure the overall bonding performance. In this way, the technical problems of insufficient strength and inconvenient molding of the bottom guard plate can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the exploded structure of the bottom guard plate provided in the embodiment of the utility model;

[0026] Figure 2It is a three-dimensional schematic diagram of a base plate provided by an embodiment of the utility model;

[0027] Figure 3 It is a three-dimensional schematic diagram of a top plate provided in an embodiment of the utility model;

[0028] Figure 4 It is one of the partial cross-sectional views of the bottom guard plate provided in the embodiment of the utility model;

[0029] Figure 5 This is the second partial cross-sectional view of the bottom guard plate provided in the embodiment of the utility model;

[0030] Figure 6 This is the third partial cross-sectional view of the bottom guard plate provided in the embodiment of the utility model.

[0031] Reference numerals:

[0032] 10 - bottom plate, 110 - plate body, 120 - extension part, 130 - connection part, 20 - top plate, 30 - foam rubber layer, 40 - protrusion, 50 - cavity. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0034] For details, please refer to Figures 1 to 6 The embodiment of the utility model provides a bottom guard plate. The bottom guard plate includes a bottom plate 10, a top plate 20 and a foam layer 30. The top plate 20 is spaced apart from the bottom plate 10. The foam layer 30 is disposed between the bottom plate 10 and the top plate 20. At least one of the bottom plate 10 and the top plate 20 is configured with a protrusion 40 extending toward the other.

[0035] In this embodiment, a double-layer sandwich structure bottom guard plate is formed by sandwiching a foam layer 30 between the bottom plate 10 and the top plate 20, so that the structural strength of the bottom guard plate is large and the mechanical rigidity of the whole package is guaranteed. The foam layer 30 has a large strength and a good heat insulation and noise reduction effect, and can effectively buffer and protect the bottom guard plate when it is hit. The foam layer 30 can also directly bond the bottom plate 10 and the top plate 20, so that the bottom guard plate can be quickly formed. The protrusion 40 can increase the bonding area and fill the foaming gap to ensure the overall bonding performance. In this way, the technical problems of insufficient strength and inconvenient molding of the bottom guard plate can be improved.

[0036] It is understandable that the foam glue layer 30 is formed by foaming the foam glue. Since the foam glue may form defects such as gaps during the foaming process, the bonding area between the foam glue layer 30 and the top plate 20 or the bottom plate 10 is small or there is a phenomenon of non-bonding, resulting in poor bonding between the bottom plate 10 and the top plate 20 in some areas. A protrusion 40 is provided on the top plate 20 or the bottom plate 10. The protrusion 40 has a circular end face and an arc surface connected to the circumference of the circular end face. The arc surface can increase the bonding area with the foam glue, thereby improving the bonding effect. At the same time, the protrusion 40 can also fill the foaming gap, thereby reducing the defects of the foam glue layer 30, so that the bottom plate 10 and the top plate 20 can be effectively bonded to the foam glue layer 30, ensuring the overall bonding performance of the bottom guard plate.

[0037] Among them, the protrusion 40 can not only reduce the gap defect, but also reduce the amount of foam glue used accordingly, thereby reducing the production cost. In addition, after the protrusion 40 is bonded to the top plate 20 or the bottom plate 10 through the foam glue layer 30, or after the protrusion 40 directly abuts against the top plate 20 or the bottom plate 10, it can also support the bottom plate 10, ensuring that when the bottom plate 10 is impacted, the stress can be dispersed to the protrusion 40 and transferred to the top plate 20. In this way, the overall mechanical strength of the bottom guard plate can be improved to ensure the safety of the product.

[0038] It is understandable that the foam layer 30 has a strength of about 3MPa (megapascals) based on its own performance, which can make the bottom guard plate have good structural strength, effectively buffer and protect against impacts at the bottom, and ensure the safety of the battery pack. The foam layer 30 also has good heat and sound insulation effects, which makes the heat and sound insulation effects of the bottom guard plate better.

[0039] Before assembling the bottom plate 10, the top plate 20 and the foam layer 30, the bottom plate 10 and the top plate 20 are plasma cleaned on their sides facing each other, and then the foam is sprayed or poured on the bottom plate 10, and then the top plate 20 is covered on the top of the bottom plate 10 and pressed with a tool. After the foam is foamed to form the foam layer 30 between the top plate 20 and the bottom plate 10, the tool is removed. In this way, the molding of the bottom guard plate is simple and the cost is low, and the production efficiency of the bottom guard plate can be improved, and the bottom guard plate can be ensured to have good structural strength.

[0040] like Figure 4 and Figure 5 As shown, in some embodiments, the protrusion 40 is disposed on a side of the top plate 20 facing the bottom plate 10 , wherein the protrusion 40 is spaced apart from the bottom plate 10 , or the protrusion 40 abuts against the bottom plate 10 .

[0041] For example, the protrusion 40 is disposed on the top plate 20, and after the protrusion 40 extends toward the bottom plate 10, a gap of a certain distance is formed between the protrusion 40 and the bottom plate 10, so that the protrusion 40 can fill part of the gap and increase the bonding area. In addition, the protrusion 40 and the foaming rubber layer 30 can also support the bottom plate 10, so as to transfer the force of the bottom plate 10 to the top plate 20, ensuring that the bottom guard plate has good structural strength.

[0042] For example, the protrusion 40 is provided on the top plate 20, and after the protrusion 40 extends toward the bottom plate 10, the protrusion 40 is abutted against the bottom plate 10, so that the protrusion 40 can fill part of the gap and increase the bonding area. In addition, the protrusion 40 can also support the bottom plate 10, so as to transfer the force of the bottom plate 10 to the top plate 20, ensuring that the bottom guard plate has good structural strength.

[0043] In some embodiments, the protrusion 40 is disposed on a side of the bottom plate 10 facing the top plate 20 , wherein the protrusion 40 is spaced apart from the top plate 20 , or the protrusion 40 is in contact with the top plate 20 .

[0044] For example, the protrusion 40 is arranged on the bottom plate 10, and after the protrusion 40 extends toward the top plate 20, a gap of a certain distance is formed between the protrusion 40 and the top plate 20, so that the protrusion 40 can fill part of the gap and increase the bonding area. In addition, the protrusion 40 and the foaming rubber layer 30 can also support the bottom plate 10, so as to transfer the force of the bottom plate 10 to the top plate 20, ensuring that the bottom guard plate has good structural strength.

[0045] For example, the protrusion 40 is provided on the bottom plate 10, and after the protrusion 40 extends toward the top plate 20, the protrusion 40 is abutted against the bottom top, so that the protrusion 40 can fill part of the gap and increase the bonding area. In addition, the protrusion 40 can also support the bottom plate 10, thereby transmitting the force of the bottom plate 10 to the top plate 20, ensuring that the bottom guard plate has good structural strength.

[0046] like Figure 2 and Figure 6As shown, in some embodiments, the bottom plate 10 includes a plate body 110, an extension portion 120 and a connection portion 130. The plate body 110 and the top plate 20 are spaced apart. The extension portion 120 is disposed around the edge of the plate body 110, and the extension portion 120 extends toward the bottom plate 10. The connection portion 130 is disposed around a side of the extension portion 120 away from the plate body 110, and the connection portion 130 is connected to the top plate 20. The plate body 110, the extension portion 120, the connection portion 130 and the top plate 20 enclose a cavity 50, and the foaming rubber layer 30 is filled in the cavity 50.

[0047] The extension portion 120 and the plate body 110 may form a concave structure, so that the foam glue is sprayed or poured into the concave to prevent the foam glue from overflowing from the bottom plate 10 .

[0048] The plate body 110, the extension part 120 and the connection part 130 are integrally formed. The plate body 110 and the top plate 20 are spaced apart so that the foam layer 30 is sandwiched between the plate body 110 and the top plate 20. The extension part 120 is used to seal the peripheral side of the cavity 50 to prevent the foam from overflowing from the peripheral side. The connection part 130 is used to make the bottom plate 10 and the top plate 20 form a butt joint.

[0049] Among them, a plurality of first connection holes are arranged at intervals on the connection part 130 along its extension direction, and a plurality of second connection holes corresponding to the first connection holes are also arranged on the top plate 20. After the bottom plate 10 and the top plate 20 are bonded together through the foamed adhesive layer 30, the bottom guard plate will be installed on the bottom of the battery box. At this time, the fastener is inserted through the first connection hole, the second connection hole and the mounting hole of the battery box to realize the assembly between the bottom guard plate and the battery box. At the same time, the fastener can further play the effect of fastening the connection between the bottom plate 10 and the top plate 20 to ensure the stability of the bottom guard plate assembly.

[0050] In some embodiments, the height of the cavity 50 is 5 mm to 6 mm, and the height of the protrusion 40 is 2 mm to 3 mm.

[0051] For example, the height of the cavity 50 is 5 mm, 5.5 mm or 6 mm, or any value therebetween. For example, the height of the protrusion 40 is 2 mm, 2.5 mm or 3 mm, or any value therebetween.

[0052] Based on the height of the cavity 50 being 5 mm to 6 mm, the thickness of the foamed rubber layer 30 at a position away from the protrusion 40 is 5 mm to 6 mm. Based on the height of the protrusion 40 being 2 mm to 3 mm, the thickness of the foamed rubber layer 30 at a position corresponding to the protrusion 40 is 2 mm to 4 mm.

[0053] For example, when the height of the cavity 50 is 5 mm and the height of the protrusion 40 is 3 mm, the thickness of the foamed rubber layer 30 at a position away from the protrusion 40 is 5 mm, and the thickness of the foamed rubber layer 30 at a position corresponding to the protrusion 40 is 2 mm. For example, when the height of the cavity 50 is 6 mm and the height of the protrusion 40 is 2 mm, the thickness of the foamed rubber layer 30 at a position away from the protrusion 40 is 6 mm, and the thickness of the foamed rubber layer 30 at a position corresponding to the protrusion 40 is 4 mm.

[0054] In other embodiments of the present invention, when the protrusion 40 abuts against the top plate 20 or the bottom plate 10 , the height of the protrusion 40 is consistent with the height of the cavity 50 .

[0055] In some embodiments, the extension portion 120 and the plate body 110 are arranged at an obtuse angle, and the extension portion 120 and the connecting portion 130 are also arranged at an obtuse angle. Thus, an outward-turned pit is formed between the extension portion 120 and the plate body 110 to facilitate the storage of the foam glue. The extension portion 120 and the connecting portion 130 are also arranged at an obtuse angle, so that the connecting portion 130 and the plate body 110 are arranged in parallel, and the connecting portion 130 and the plate body 110 are respectively located on both sides of the extension portion 120.

[0056] In some embodiments, the bottom plate 10 is an aluminum plate, and the thickness of the bottom plate 10 is 0.8 mm to 1.2 mm. The top plate 20 is a steel plate, and the thickness of the top plate 20 is 0.6 mm to 1 mm.

[0057] Since the bottom plate 10 is an aluminum plate, the bottom plate 10 can be made lighter and easier to shape. This allows the extension portion 120 and the connection portion 130 to be formed on the periphery of the bottom plate 10. Since the top plate 20 is a steel plate, the top plate 20 can be made stronger. The aluminum plate and the steel plate sandwich the foam layer 30 to form a bottom guard plate with a double-layer sandwich structure, which increases the structural strength of the bottom guard plate and ensures the mechanical rigidity of the entire package.

[0058] Based on the fact that the bottom plate 10 is an aluminum plate and the top plate 20 is a steel plate. The protrusion 40 is arranged on the top plate 20 and extends in the direction of the bottom plate 10. The protrusion 40 arranged on the top plate 20 is formed integrally with the top plate 20. For example, the top plate 20 is formed by a process such as stamping, and a plurality of protrusions 40 are formed on the top plate 20 by stamping at one time. The protrusion 40 on the top plate 20 can support the aluminum plate at multiple points through the foam layer 30, or directly abut against the aluminum plate for multiple points of support. Therefore, when the bottom aluminum plate is impacted, the stress can be transferred to the steel plate through the protrusion 40, thereby improving the overall mechanical strength and ensuring the safety of the bottom guard plate.

[0059] The thickness of the bottom plate 10 can be 0.8 mm, 1 mm or 1.2 mm, or any value therebetween. The thickness of the top plate 20 can be 0.6 mm, 0.8 mm or 1 mm, or any value therebetween.

[0060] like Figure 3 As shown, in some embodiments, at least two protrusions 40 are provided, and at least two protrusions 40 are spaced apart and distributed on the bottom plate 10 or the top plate 20 .

[0061] By setting the number of protrusions 40 to be multiple, gaps in multiple positions can be filled and the bonding area can be further increased to ensure reliable bonding between the bottom plate 10 and the top plate 20. At the same time, the multiple protrusions 40 can also enable the top plate 20 to support the bottom plate 10 at multiple points, so that when the bottom plate 10 is hit, stress can be transmitted through multiple points, thereby improving the overall mechanical strength of the bottom guard plate and ensuring the safety of the product.

[0062] Based on the provision of multiple protrusions 40, the fault tolerance for gaps can also be improved. It is understandable that, since gap defects will not be formed at the position of each protrusion 40 during the foaming process. When no air defect is formed at the position of the protrusion 40, the protrusion 40 only serves to increase the bonding area. When the gap defect generated during the foaming process is misaligned with the protrusion 40, the protrusion 40 also only serves to increase the bonding area. Due to the provision of multiple protrusions 40, at least part of the protrusions 40 can be used to fill the gap defects to ensure the bonding effect.

[0063] For example, the protrusions 40 are configured on the top plate 20, and at least two protrusions 40 may be distributed in a matrix on the top plate 20. Alternatively, at least two protrusions 40 may be distributed in a disordered interval on the top plate 20.

[0064] For example, the protrusions 40 are configured on the bottom plate 10, and at least two protrusions 40 may be distributed in a matrix on the bottom plate 10. Alternatively, at least two protrusions 40 may be distributed on the bottom plate 10 at random intervals.

[0065] On the other hand, the embodiment of the utility model further provides a battery box, which includes the bottom guard plate in the above embodiment.

[0066] In this embodiment, a double-layer sandwich structure bottom guard plate is formed by sandwiching a foam layer 30 between the bottom plate 10 and the top plate 20, so that the structural strength of the bottom guard plate is large and the mechanical rigidity of the whole package is guaranteed. The foam layer 30 has a large strength and a good heat insulation and noise reduction effect, and can effectively buffer and protect the bottom guard plate when it is hit. The foam layer 30 can also directly bond the bottom plate 10 and the top plate 20, so that the bottom guard plate can be quickly formed. The protrusion 40 can increase the bonding area and fill the foaming gap to ensure the overall bonding performance. In this way, the technical problems of insufficient strength and inconvenient molding of the bottom guard plate can be improved.

[0067] In another aspect, the present invention also provides a battery pack, which includes the battery box in the above embodiment.

[0068] In this embodiment, a double-layer sandwich structure bottom guard plate is formed by sandwiching a foam layer 30 between the bottom plate 10 and the top plate 20, so that the structural strength of the bottom guard plate is large and the mechanical rigidity of the whole package is guaranteed. The foam layer 30 has a large strength and a good heat insulation and noise reduction effect, and can effectively buffer and protect the bottom guard plate when it is hit. The foam layer 30 can also directly bond the bottom plate 10 and the top plate 20, so that the bottom guard plate can be quickly formed. The protrusion 40 can increase the bonding area and fill the foaming gap to ensure the overall bonding performance. In this way, the technical problems of insufficient strength and inconvenient molding of the bottom guard plate can be improved.

[0069] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A bottom guard plate, characterized in that: include: Base plate; A top plate, spaced apart from the bottom plate; A foam rubber layer is provided between the bottom plate and the top plate; Wherein, at least one of the bottom plate and the top plate is configured with a protrusion extending toward the other.

2. The bottom guard plate according to claim 1, characterized in that: The protrusion is arranged on a side of the top plate facing the bottom plate, wherein the protrusion is spaced apart from the bottom plate, or the protrusion is in contact with the bottom plate.

3. The bottom guard plate according to claim 1, characterized in that: The protrusion is arranged on a side of the bottom plate facing the top plate, wherein the protrusion is spaced apart from the top plate, or the protrusion is in contact with the top plate.

4. The bottom guard plate according to any one of claims 1 to 3, characterized in that: The bottom plate comprises: A plate body, spaced apart from the top plate; An extension portion is disposed around the edge of the plate body, and the extension portion extends toward the bottom plate; A connecting portion, arranged around a side of the extending portion away from the plate body, the connecting portion being connected to the top plate; The plate body, the extension part, the connection part and the top plate are enclosed to form a cavity, and the foam rubber layer is filled in the cavity.

5. The bottom guard plate according to claim 4, characterized in that: The height of the cavity is 5 mm to 6 mm, and the height of the protrusion is 2 mm to 3 mm.

6. The bottom guard plate according to claim 4, characterized in that: The extending portion and the plate body are arranged at an obtuse angle, and the extending portion and the connecting portion are also arranged at an obtuse angle.

7. The bottom guard plate according to any one of claims 1 to 3, characterized in that: The bottom plate is an aluminum plate, and the thickness of the bottom plate is 0.8 mm to 1.2 mm. The top plate is a steel plate, and the thickness of the top plate is 0.6 mm to 1 mm.

8. The bottom guard plate according to any one of claims 1 to 3, characterized in that: The number of the protrusions is at least two, and the at least two protrusions are spaced apart and distributed on the bottom plate or the top plate.

9. A battery box, characterized in that: Comprising a bottom guard plate as described in any one of claims 1-8.

10. A battery pack, characterized in that: Comprising a battery box as claimed in claim 9.

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