Bottom protection plate assembly and battery pack

Abstract

The utility model discloses a bottom guard plate assembly and a battery pack, the bottom guard plate assembly comprises a first guard plate, a second guard plate, a third guard plate and a fourth guard plate, the first guard plate is bent to define a first cavity; and the second protection plate is bent to be connected with the first protection plate, a second cavity is defined by the second protection plate, and the first cavity and the second cavity are stacked in the first direction and are arranged at intervals. According to the bottom protection plate assembly disclosed by the utility model, the first cavity and the second cavity which are stacked and arranged at an interval are arranged, so that on the basis of not increasing the weight of the battery pack, the buffering performance and the energy absorption performance of the bottom protection plate assembly are improved, the impact resistance of the bottom protection plate assembly is improved, the overall structure of the bottom protection plate assembly is optimized, and the overall structure is simple and convenient to operate. The performance of the bottom protection plate assembly is improved, and meanwhile the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle manufacturing, in particular to an underbody guard plate assembly and a battery pack. Background Art

[0002] With the rapid development of new energy vehicles, more and more new energy vehicles are appearing on the market, and more and more accidents related to new energy vehicles are coming. The safety of power batteries has also received widespread attention. When electric vehicles encounter potholes, uphill tops, road obstacles, ground impact objects, etc., the bottom of the battery pack will cause structural deformation and damage to the battery pack. The bottom protection structure of the battery pack is the last protective layer at the bottom of the battery pack on electric vehicles. It plays a vital role in protecting the bottom of the battery pack. However, in the relevant technology, the bottom protection structure of the battery pack has low strength and poor impact resistance. More serious impacts will cause the battery cell shell to rupture, causing fire and explosion accidents, and safety cannot be guaranteed. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a bottom guard plate assembly, the bottom guard plate assembly has a stable overall structure and good impact resistance.

[0004] The utility model also provides a battery pack having the bottom guard plate assembly.

[0005] According to the first aspect of the utility model, the bottom guard plate assembly includes: a first guard plate, which is bent to define a first cavity; a second guard plate, which is bent and connected to the first guard plate and defines a second cavity, wherein the first cavity and the second cavity are stacked and spaced apart in a first direction.

[0006] According to the bottom guard plate assembly of the utility model, by arranging the first cavity and the second cavity which are stacked and spaced apart, the buffering performance and energy absorption performance of the bottom guard plate assembly are improved without increasing the weight of the battery pack, the impact resistance of the bottom guard plate assembly is improved, and the overall structure of the bottom guard plate assembly is optimized. The overall structure is simple, which improves the performance of the bottom guard plate assembly and reduces the production cost at the same time.

[0007] In some embodiments, the first guard plate has a first plate body, a second plate body and a third plate body, the first plate body and the second plate body are parallel and spaced apart in the first direction, and the third plate body extends in the first direction and is connected to the first plate body and the second plate body.

[0008] In some embodiments, the second guard plate has a first section, a second section and a third section, the first section and the third section are arranged in parallel and both ends of the second section are respectively connected to the first section and the third section, the second section extends obliquely in a first direction, and the second section and the third section are symmetrically arranged about the center line of the first section.

[0009] In some embodiments, the outer wall of the third plate is welded to the inner wall of the second section, and the welding width L1 between the outer wall of the third plate and the inner wall of the second section satisfies: 0.25L2≤L1≤0.5L2, where L2 is the bending width of the second section.

[0010] In some embodiments, the first plate body, the second plate body and the third plate body define the first cavity; the first plate body, the first section and at least part of the second section define the second cavity, and the first cavity and the second cavity are both filled with buffer members.

[0011] In some embodiments, a ratio between a height h1 of the first cavity and a height h2 of the second cavity is not less than 2, and a height h2 of the second cavity is not less than 0.5 mm.

[0012] In some embodiments, the first plate body and the third plate body are arranged at an angle to form an angle α, and the angle α is in the range of 40°-50°; the second plate body and the third plate body are arranged at an angle to form an angle β1, and the angle β1 is in the range of 130°-140°.

[0013] In some embodiments, the first segment and the second segment are arranged at an angle to form an angle β2, and the angle β2 is in the range of 130°-140°; the second segment and the third segment are arranged at an angle to form an angle β3, and the angle β3 is in the range of 130°-140°; and the angles of the angles β1, β2 and β3 are the same.

[0014] In some embodiments, the bending radius R of the first plate body and the second plate body is not less than 3 mm; and the bending width of the second section is not less than 4 mm.

[0015] The battery pack according to the second aspect of the utility model comprises a side beam and a bottom guard plate assembly according to the first aspect of the utility model, a connecting hole is formed on the third section of the bottom guard plate assembly, and the bottom guard plate assembly is fixedly connected to the side beam by fasteners passing through the connecting hole.

[0016] According to the battery pack of the utility model, by providing the bottom guard plate assembly of the first aspect, the protection performance and energy absorption performance of the bottom of the battery pack are improved, the overall stability and strength of the battery pack are enhanced, and the safety of the battery pack is ensured.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a bottom guard plate assembly according to an embodiment of the utility model;

[0019] Figure 2 yes Figure 1 A schematic diagram of the bottom guard plate assembly AA section shown in;

[0020] Figure 3 yes Figure 2 A partial enlarged schematic diagram of the bottom guard plate assembly shown in ;

[0021] Figure 4 yes Figure 1 Schematic diagram of the bottom guard plate assembly BB section shown in.

[0022] Reference numerals:

[0023] 100. Bottom guard plate assembly; 1. first guard plate; 11. first plate body; 12. second plate body; 13. third plate body; 2. second guard plate; 21. first section; 22. second section; 23. third section; 3. first cavity; 4. second cavity; 5. welding position. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] Reference below Figure 1-Figure 4 The bottom guard plate assembly 100 according to the first embodiment of the utility model is described.

[0026] like Figure 1-Figure 4 As shown, the bottom guard plate assembly 100 according to the first embodiment of the utility model includes: a first guard plate 1 and a second guard plate 2.

[0027] Specifically, the first guard plate 1 is bent to define a first cavity 3, and the second guard plate 2 is bent to connect with the first guard plate 1 and define a second cavity 4, wherein the first cavity 3 and the second cavity 4 are stacked and spaced apart in the first direction. Thus, the bottom guard plate assembly 100 has high structural strength and good protection performance.

[0028] According to the bottom guard plate assembly 100 of the embodiment of the utility model, by arranging the first cavity 3 and the second cavity 4 which are stacked and spaced apart, the buffering performance and energy absorption performance of the bottom guard plate assembly 100 are improved without increasing the weight of the battery pack, the impact resistance of the bottom guard plate assembly 100 is improved, and the overall structure of the bottom guard plate assembly 100 is optimized. The overall structure is simple, which improves the performance of the bottom guard plate assembly 100 and reduces the production cost at the same time.

[0029] In some embodiments of the present invention, the first guard plate 1 comprises a first plate body 11, a second plate body 12 and a third plate body 13, wherein the first plate body 11 and the second plate body 12 are arranged parallel and spaced apart in a first direction, and the third plate body 13 extends in the first direction and is connected to the first plate body 11 and the second plate body 12. Figure 3 As shown, the first plate 11 and the second plate 12 are arranged parallel and spaced apart in the vertical direction, the third plate 13 extends obliquely from left to right in the direction from top to bottom, the lower end of the third plate 13 is connected to the first plate 11, and the upper end of the third plate 13 is connected to the second plate 12. The cross section of the first cavity 3 is an isosceles trapezoid that is narrow at the top and wide at the bottom, and the structure is stable and not easily deformed. As a result, the overall stability and strength of the bottom guard plate assembly 100 are enhanced, and the safety of the battery pack is ensured.

[0030] In some embodiments of the present invention, the second guard plate 2 has a first section 21, a second section 22 and a third section 23, the first section 21 and the third section 23 are arranged in parallel and the two ends of the second section 22 are connected to the first section 21 and the third section 23 respectively, the second section 22 extends obliquely in the first direction, and the second section 22 and the third section 23 are arranged symmetrically about the center line of the first section 21. Figure 2 and 3 As shown, both sides of the first section 21 are connected to a second section 22, and one end of the second section 22 away from the first section 21 is connected to a third section 23. Obviously, the second guard plate 2 has a simple structure and is easy to bend, which reduces the production difficulty and production cost of the bottom guard plate assembly 100.

[0031] In some embodiments of the present invention, the outer wall of the third plate body 13 is welded to the inner wall of the second section 22, such as Figure 1 and Figure 3At the welding position 5 shown, the welding width L1 between the outer wall of the third plate body 13 and the inner wall of the second section 22 satisfies: 0.25L2≤L1≤0.5L2, where L2 is the bending width of the second section 22. It can be understood that the ratio between the welding width L1 and the bending width L2 of the second section 22 is in the range of 0.25-0.5, which ensures the connection stability of the first guard plate 1 and the second guard plate 2. For example, the ratio between the welding width L1 and the bending width L2 of the second section 22 can be 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, etc.

[0032] In some embodiments of the present invention, Figure 2 and Figure 3 As shown, the first plate body 11, the second plate body 12 and the third plate body 13 define a first cavity 3; the first plate body 11, the first section 21 and at least part of the second section 22 define a second cavity 4, and the first cavity 3 and the second cavity 4 are both filled with buffer components, wherein the buffer components are foam, which further enhances the buffering and energy absorption performance of the bottom of the battery pack.

[0033] In some embodiments of the present invention, the ratio between the height h1 of the first cavity 3 and the height h2 of the second cavity 4 is not less than 2, and the height h2 of the second cavity 4 is not less than 0.5 mm. For example, the height h2 of the second cavity 4 can be 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1 mm, etc.; the ratio between the height h1 of the first cavity 3 and the height h2 of the second cavity 4 can be 2, 2.5, 3, 3.5, 4, 4.5, 5, etc.

[0034] In some embodiments of the utility model, the first plate body 11 and the third plate body 13 are arranged at an angle to form an angle α, and the angle α is in the range of 40°-50°; the second plate body 12 and the third plate body 13 are arranged at an angle to form an angle β1, and the angle β1 is in the range of 130°-140°. It can be understood that the angle α and the angle β1 are co-lateral internal angles. For example, the angle α can be 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°, etc.; the angle β1 can be 130°, 131°, 132°, 133°, 134°, 135°, 136°, 137°, 138°, 139°, 140°, etc.

[0035] In some embodiments of the present invention, the first section 21 and the second section 22 are arranged at an angle to form an angle β2, and the angle β2 is within the range of 130°-140°; the second section 22 and the third section 23 are arranged at an angle to form an angle β3, and the angle β3 is within the range of 130°-140°; and the angles of the angles β1, β2 and β3 are the same. It can be understood that the angles β1 and β2 are co-position angles, and the angles β2 and β3 are interior alternate angles. For example, the angle β2 can be 130°, 131°, 132°, 133°, 134°, 135°, 136°, 137°, 138°, 139°, 140°, etc.; the angle β3 can be 130°, 131°, 132°, 133°, 134°, 135°, 136°, 137°, 138°, 139°, 140°, etc.

[0036] In some embodiments of the present invention, the bending radius R of the first plate body 11 and the second plate body 12 is not less than 3mm; the bending width of the second section 22 is not less than 4mm. For example, the bending radius R of the first plate body 11 and the second plate body 12 can be 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, etc.; the bending width of the second section 22 can be 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, 6.2mm, 6.4mm, 6.6mm, etc.

[0037] To sum up, the bottom guard plate assembly 100 of the embodiment of the utility model is made by bending and welding processes, which effectively reduces the difficulty of the manufacturing process. The overall three-layer plate and two-layer foam protection make the bottom guard plate assembly 100 have excellent protection performance and energy absorption performance. At the same time, by changing the height h1 of the first cavity 3 and the height h2 of the second cavity 4 and the thickness of the plate, it can be better adapted to different battery pack spaces, and different energy-absorbing buffer materials can be selected in the first cavity 3 and the second cavity 4 according to specific protection requirements to adapt different protection performances.

[0038] According to the battery pack of the embodiment of the second aspect of the utility model, it includes a side beam and a bottom guard plate assembly 100 according to the embodiment of the first aspect of the utility model. A connecting hole is formed on the third section 23 of the bottom guard plate assembly 100, and the bottom guard plate assembly 100 is fixedly connected to the side beam by fasteners passing through the connecting hole.

[0039] According to the battery pack of the embodiment of the utility model, by setting the bottom guard plate assembly 100 of the above-mentioned first aspect embodiment, the protection performance and energy absorption performance of the bottom of the battery pack are improved, the overall stability and strength of the battery pack are enhanced, and the safety of the battery pack is ensured.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] 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 the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0044] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A bottom guard plate assembly, characterized in that: include: A first guard plate, wherein the first guard plate is bent to define a first cavity; a second guard plate, the second guard plate is bent and connected to the first guard plate and defines a second cavity, Wherein, the first cavity and the second cavity are stacked and spaced apart in a first direction.

2. The bottom guard plate assembly according to claim 1, characterized in that: The first guard plate comprises a first plate body, a second plate body and a third plate body, the first plate body and the second plate body are parallel and spaced apart in a first direction, and the third plate body extends in the first direction and is connected to the first plate body and the second plate body.

3. The bottom guard plate assembly according to claim 2, characterized in that: The second guard plate has a first section, a second section and a third section, the first section and the third section are arranged in parallel and the two ends of the second section are respectively connected to the first section and the third section, the second section extends obliquely in a first direction, and the second section and the third section are symmetrically arranged about the center line of the first section.

4. The bottom guard plate assembly according to claim 3, characterized in that: The outer wall of the third plate body is welded to the inner wall of the second section, and a welding width L1 between the outer wall of the third plate body and the inner wall of the second section satisfies: 0.25L2≤L1≤0.5L2, where L2 is the bending width of the second section.

5. The bottom guard plate assembly according to claim 4, characterized in that: The first plate body, the second plate body and the third plate body define the first cavity; the first plate body, the first section and at least part of the second section define the second cavity, and the first cavity and the second cavity are both filled with buffers.

6. The bottom guard plate assembly according to claim 5, characterized in that: The ratio of the height h1 of the first cavity to the height h2 of the second cavity is not less than 2, and the height h2 of the second cavity is not less than 0.5 mm.

7. The bottom guard plate assembly according to claim 3, characterized in that: The first plate body and the third plate body are arranged at an angle to form an angle α, and the angle α is in the range of 40°-50°; the second plate body and the third plate body are arranged at an angle to form an angle β1, and the angle β1 is in the range of 130°-140°.

8. The bottom guard plate assembly according to claim 7, characterized in that: The first section and the second section are arranged at an angle to form an angle β2, and the angle β2 is in the range of 130°-140°; the second section and the third section are arranged at an angle to form an angle β3, and the angle β3 is in the range of 130°-140°; and the angles of the angles β1, β2 and β3 are the same.

9. The bottom guard plate assembly according to claim 5, characterized in that: The bending radius R of the first plate body and the second plate body is not less than 3 mm; and the bending width of the second section is not less than 4 mm.

10. A battery pack, characterized in that: include: The side beam and the bottom guard plate assembly according to any one of claims 1 to 9, wherein a connecting hole is formed on the third section of the bottom guard plate assembly, and the bottom guard plate assembly is fixedly connected to the side beam by fasteners passing through the connecting hole.

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