Battery tray, battery pack and vehicle

Abstract

The utility model discloses a battery tray, a battery pack and a vehicle. The battery tray comprises a tray body; the battery tray comprises a tray body and a reinforcing part, the reinforcing part is arranged on at least one side of the tray body, the reinforcing part is a negative poisson ratio material part, and the poisson ratio of the reinforcing part is smaller than-0.2, so that the heat preservation and buffering performance of the battery tray is enhanced. According to the battery tray disclosed by the utility model, the heat preservation and buffering energy absorption performance of the battery tray can be effectively enhanced, and the battery tray not only has a good heat preservation effect, but also has a good buffering energy absorption effect. When the battery tray is collided and extruded, collision energy is absorbed through contraction or stretching of the reinforcing parts, so that buffering energy absorption of the battery tray is realized, and the risk of accidental failure of the battery pack is reduced. According to the utility model, the reinforcers made of the negative Poisson's ratio material are adopted, so that additional buffer structural members are not needed, the number of structural parts is small, and the occupied space and weight of the battery tray are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, and more specifically, to a battery tray, a battery pack and a vehicle. Background Art

[0002] In the prior art, the tray of the battery pack is usually provided with thermal insulation foam to enhance the thermal insulation effect of the tray. However, the existing thermal insulation foam is usually made of foaming material directly molded and foamed, and the Poisson's ratio of the thermal insulation foam is generally greater than 0.1, which can only play a role in thermal insulation, and the buffering and energy absorption effect is insufficient, which reduces the collision performance of the battery pack. In order to solve the buffering and energy absorption problem of the tray, an additional buffer structure needs to be set up, which increases the number of parts of the battery pack, occupies space and the overall weight. Utility Model Content

[0003] One purpose of the utility model is to provide a new technical solution for a battery tray, a battery pack and a vehicle, which can at least solve the problems of insufficient buffering and energy absorption of the thermal insulation foam on the tray in the prior art.

[0004] According to a first aspect of the utility model, a battery tray is provided, comprising: a tray body; a reinforcement member, wherein the reinforcement member is arranged on at least one side of the tray body, the reinforcement member is a negative Poisson's ratio material member, and the Poisson's ratio of the reinforcement member is less than -0.2, so as to enhance the thermal insulation and buffering performance of the battery tray.

[0005] Optionally, the closed cell ratio of the reinforcement is greater than 70%.

[0006] Optionally, the density of the reinforcement is less than or equal to 500 kg / m 3 .

[0007] Optionally, the density of the reinforcement is less than or equal to 300 kg / m 3 .

[0008] Optionally, the reinforcement is provided with a concave structure.

[0009] Optionally, the concave structure is a concave hexagonal honeycomb model, a concave triangle model or a star model.

[0010] Optionally, the reinforcement is arranged on outer walls on opposite sides of the tray body, and the thickness of the reinforcement is 1-10 mm.

[0011] Optionally, the thickness of the reinforcement is 3-8 mm.

[0012] A second aspect of the present invention provides a battery pack, comprising the battery tray described in the above embodiment.

[0013] A third aspect of the present invention provides a vehicle, comprising the battery pack described in the above embodiment.

[0014] The battery tray of the utility model is provided with a reinforcement on the side of the tray body. The reinforcement is made of negative Poisson's ratio material, and the negative Poisson's ratio of the reinforcement is less than -0.2, which effectively enhances the thermal insulation and buffering energy absorption performance of the battery tray, ensuring that the battery tray not only has good thermal insulation effect, but also has good buffering energy absorption effect. When the battery tray is collided or squeezed, the collision energy is absorbed by the contraction or expansion of the reinforcement, so as to achieve buffering energy absorption of the battery tray and reduce the risk of accidental failure of the battery pack. By adopting a reinforcement made of negative Poisson's ratio material, the utility model does not need to set up additional buffer structural parts, has fewer structural parts, and reduces the space occupied and weight of the battery tray.

[0015] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0017] Figure 1 is a schematic structural diagram of a battery tray according to an embodiment of the utility model;

[0018] Figure 2 is a structural schematic diagram of a reinforcement member of a battery tray according to an embodiment of the utility model;

[0019] Figure 3 It is a partial enlarged view of the reinforcement member according to an embodiment of the utility model.

[0020] Reference numerals:

[0021] Battery tray 100;

[0022] Tray body 10;

[0023] reinforcement member 20; inner concave structure 21;

[0024] Battery cell 30. DETAILED DESCRIPTION

[0025] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0026] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0027] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0028] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0029] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0030] In the specification and claims of the utility model, if the term "first" or "second" is involved, it may explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, "multiple" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the related objects are in an "or" relationship.

[0031] 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, which 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 should not be understood as a limitation on the present invention.

[0032] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" involved 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 or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] The battery tray 100 according to the embodiment of the present utility model is described in detail below with reference to the accompanying drawings.

[0034] like Figure 1 and Figure 2As shown, the battery tray 100 according to the embodiment of the present invention includes a tray body 10 and a reinforcement member 20 .

[0035] Specifically, the reinforcement member 20 is disposed on at least one side of the tray body 10 , and the reinforcement member 20 is a negative Poisson's ratio material member. The Poisson's ratio of the reinforcement member 20 is less than −0.2, so as to enhance the heat preservation and buffering performance of the battery tray 100 .

[0036] In other words, see Figure 1 The battery tray 100 according to the embodiment of the utility model is mainly composed of a tray body 10 and a reinforcement member 20. The reinforcement member 20 is installed on at least one side of the tray body 10. Figure 1 As shown, the tray body 10 is used to set the battery cell 30 and other structures. The reinforcement 20 and the tray body 10 can be fixed by bonding, screwing or other methods. Figure 2 As shown, the reinforcement 20 can be made of negative Poisson's ratio material, which can achieve tension and compression, effectively enhancing the overall structural rigidity of the battery tray 100. The Poisson's ratio of the reinforcement 20 is less than -0.2, which effectively enhances the thermal insulation and buffering energy absorption performance of the battery tray 100, ensuring that the battery tray 100 not only has a good thermal insulation effect, but also has a good buffering energy absorption effect.

[0037] When the battery tray 100 is collided and squeezed, the reinforcement 20 shrinks and becomes a dense structure. During the expansion and contraction process of the reinforcement 20, the collision energy can be effectively absorbed, so as to achieve buffering and energy absorption of the battery tray 100 and reduce the risk of accidental failure of the battery pack. By adopting the reinforcement 20 made of negative Poisson's ratio material, the utility model does not need to set up additional buffer structural parts, has fewer structural parts, and reduces the occupied space and weight of the battery tray 100.

[0038] It should be noted that Poisson's ratio refers to the ratio of transverse contraction strain to longitudinal tensile strain when a material is subjected to unidirectional tension or compression. In existing materials, Poisson's ratio is usually positive, such as 0.33 for aluminum, 0.27 for copper, and 0.11 to 0.14 for typical polymer foams. However, negative Poisson's ratio materials expand laterally when stretched and contract laterally when compressed due to their unique internal structure. They have broad application prospects in cushioning materials, sports protection equipment, manufacturing fasteners or seat belts, etc.

[0039] Negative Poisson's ratio polymer foam material is based on polymer and is made into a foam material with negative Poisson's ratio effect through different preparation methods. It is used in battery packs to replace existing polyurethane insulation foam. It has the functions of heat preservation and buffering energy absorption, which can reduce the risk of battery pack failure due to extrusion and collision.

[0040] Therefore, according to the battery tray 100 of the embodiment of the utility model, a reinforcement 20 is provided on the side of the tray body 10. The reinforcement 20 is made of negative Poisson's ratio material, and the negative Poisson's ratio of the reinforcement 20 is less than -0.2, which effectively enhances the thermal insulation and buffering energy absorption performance of the battery tray 100, and ensures that the battery tray 100 not only has good thermal insulation effect, but also has good buffering energy absorption effect. When the battery tray 100 is collided and squeezed, the collision energy is absorbed by the contraction or expansion of the reinforcement 20, so as to achieve buffering energy absorption of the battery tray 100 and reduce the risk of accidental failure of the battery pack. By adopting the reinforcement 20 made of negative Poisson's ratio material, the utility model does not need to set up additional buffering structural parts, has fewer structural parts, and reduces the occupied space and weight of the battery tray 100.

[0041] According to one embodiment of the utility model, the closed-cell ratio of the reinforcement 20 is greater than 70%. In other words, the closed-cell ratio of the reinforcement 20 can be greater than 70%. By setting the reinforcement 20 to have a closed-cell ratio greater than 70%, the tensile expansion and compression performance of the reinforcement 20 is effectively guaranteed. When the battery tray 100 is collided and squeezed, the middle of the reinforcement 20 shrinks and becomes a dense structure, increasing the structural rigidity to achieve buffering and energy absorption, and reducing the risk of accidental failure of the battery pack.

[0042] According to one embodiment of the present invention, the density of the reinforcement 20 is less than or equal to 500 kg / m 3 Optionally, the density of the reinforcement 20 is less than or equal to 300 kg / m 3 In other words, the density of the reinforcement 20 may be less than or equal to 500 kg / m 3 Optionally, the density of the reinforcement 20 may be less than or equal to 300 kg / m 3 By rationally designing the density of the reinforcement member 20 , the heat preservation and buffering performance of the reinforcement member 20 can be improved while ensuring that the reinforcement member 20 has good structural rigidity.

[0043] In the present invention, the reinforcement 20 can be made of negative Poisson's ratio thermal insulation foam, the closed cell rate of the negative Poisson's ratio thermal insulation foam is greater than 70%, and the density is less than or equal to 500 kg / m 3 , while ensuring that the reinforcement 20 has good thermal insulation and buffering energy absorption effects, the overall structure has good rigidity and light weight. The material of the reinforcement 20 can be a combination of one or more of silicone and modified foams, polyurethane and modified foams, polyolefin and modified foams, polyvinyl chloride and modified foams, epoxy and modified foams, polyamide and modified foams, polyester and modified foams, poly (meth) acrylic acid (ester, salt) and modified foams, which effectively improves the thermal insulation and buffering energy absorption effects of the battery tray 100, and can ensure that the reinforcement 20 can achieve a flame retardant grade greater than HB.

[0044] In some specific embodiments of the present invention, the reinforcement member 20 is provided with a concave structure 21. Optionally, the concave structure 21 is a concave hexagonal honeycomb model, a concave triangle model or a star model.

[0045] That is to say, Figure 2 and Figure 3 As shown, a concave structure 21 may be provided inside the reinforcement 20. The cell wall of the negative Poisson's ratio thermal insulation foam (reinforcement 20) is formed of a special polymer foam material with a concave structure 21, which effectively enhances the thermal insulation and buffering energy absorption performance of the battery tray 100, ensuring that the battery tray 100 not only has good thermal insulation effect, but also has good buffering energy absorption effect. When the battery tray 100 is collided and squeezed, the reinforcement 20 shrinks and becomes a dense structure. During the expansion and contraction process of the reinforcement 20, the collision energy can be effectively absorbed, the buffering energy absorption of the battery tray 100 is achieved, and the risk of accidental failure of the battery pack is reduced.

[0046] In the present utility model, if Figure 3 As shown, the concave structure 21 is in the shape of a concave hexagonal honeycomb model, a concave triangle model or a star-shaped model. The negative Poisson's ratio thermal insulation foam of the utility model can be obtained by compressing the original conventional polymer foam (Poisson's ratio>0) using a triaxial compression-heating method, a vacuum-heating method, a high pressure-heating method, a CO2 or solvent-assisted triaxial compression-heating method, a steam permeation condensation method and the like. It is also possible to start from a polymer liquid foaming material, pressurize the foam while foaming to achieve the negative Poisson's ratio conversion, and prepare a negative Poisson's ratio thermal insulation foam having a concave structure 21 in the shape of a concave hexagonal honeycomb model, a concave triangle model or a star-shaped model by a one-step in-situ method. Of course, those skilled in the art can understand that the specific shape of the concave structure 21 can be specifically defined according to actual needs, and is not limited in the utility model. As long as the design can meet the insulation and buffering effects of the battery tray 100, it should fall within the protection scope of the utility model.

[0047] In some specific embodiments of the present invention, the reinforcement member 20 is disposed on the outer walls of the tray body 10 on opposite sides, and the thickness of the reinforcement member 20 is 1-10 mm. Optionally, the thickness of the reinforcement member 20 is 3-8 mm.

[0048] In other words, Figure 1As shown, the outer walls of the two opposite sides of the tray body 10 may be provided with reinforcements 20, and the thickness of the reinforcements 20 may be 1-10 mm. Optionally, the thickness of the reinforcements 20 is 3-8 mm. Further, the thickness of the reinforcements 20 may be 5-8 mm. Compared with conventional thermal insulation foams, the negative Poisson's ratio thermal insulation foam of the utility model can be designed to have a smaller overall thickness, and at the same time has a greater thermal insulation and buffering energy absorption effect, ensuring that the overall weight of the reinforcements 20 is light and occupies a small space.

[0049] In summary, according to the battery tray 100 of the embodiment of the utility model, a reinforcement 20 is provided on the side of the tray body 10. The reinforcement 20 is made of negative Poisson's ratio material, and the negative Poisson's ratio of the reinforcement 20 is less than -0.2, which effectively enhances the thermal insulation and buffering energy absorption performance of the battery tray 100, and ensures that the battery tray 100 not only has good thermal insulation effect, but also has good buffering energy absorption effect. When the battery tray 100 is collided and squeezed, the collision energy is absorbed by the contraction or expansion of the reinforcement 20, so as to achieve buffering energy absorption of the battery tray 100 and reduce the risk of accidental failure of the battery pack. By adopting the reinforcement 20 made of negative Poisson's ratio material, the utility model does not need to set up additional buffering structural parts, has fewer structural parts, and reduces the occupied space and weight of the battery tray 100.

[0050] Of course, for those skilled in the art, other structures, shapes, etc. of the battery tray 100 are understandable and achievable, and will not be described in detail in the present invention.

[0051] According to the second aspect of the embodiment of the utility model, a battery pack is provided, including the battery tray 100 in the above embodiment. In the battery pack of the utility model, in addition to the battery tray 100 provided with negative Poisson's ratio insulation foam, it can also include electrical connection and sampling system management components such as battery cells 30, aerogel, sealing cover, liquid cold plate, bottom guard plate, BIC (Battery Information Collector) and BDU (Power Distribution Unit), and the negative Poisson's ratio insulation foam (reinforcement member 20) is arranged on both sides of the outside of the tray body 10. After the battery cells 30 are stacked, the tray is inverted with thermal conductive structural glue to make the cold plate and the battery cells 30 firmly bonded, and the structural glue is applied to the top of the battery cells 30 after turning 180° to achieve the structural bonding of the battery cells 30 and the sealing cover. Finally, the bottom guard plate, negative Poisson's ratio insulation foam, BIC and BDU and other electrical connection and sampling system management components are added to complete the assembly of the battery pack.

[0052] Since the battery tray 100 according to the embodiment of the utility model has the above-mentioned technical effects, the battery pack according to the embodiment of the utility model should also have the corresponding technical effects, that is, the battery pack of the utility model can effectively enhance the thermal insulation and buffering energy absorption performance of the battery pack by adopting the battery tray 100, ensuring that the battery pack not only has good thermal insulation effect, but also has good buffering energy absorption effect. When the battery pack is collided and squeezed, the collision energy is absorbed by the contraction or expansion of the reinforcement 20, so as to achieve buffering energy absorption of the battery pack and reduce the risk of accidental failure of the battery pack. By adopting the reinforcement 20 made of negative Poisson's ratio material, the utility model does not need to set up additional buffer structural parts, has fewer structural parts, and reduces the overall occupied space and weight of the battery pack.

[0053] Of course, for those skilled in the art, other structures of the battery pack and its working principles are understandable and achievable, and will not be described in detail in the present invention.

[0054] According to the third aspect of the present invention, a vehicle is provided, comprising the battery pack in the above embodiment. Since the battery pack according to the embodiment of the present invention has the above technical effects, the vehicle according to the embodiment of the present invention should also have the corresponding technical effects, that is, the vehicle of the present invention can effectively improve the anti-collision energy absorption of the vehicle by adopting the battery pack. When the vehicle is collided and squeezed, the battery pack inside the vehicle absorbs the collision energy through the contraction or expansion of the reinforcement 20, realizes the buffering energy absorption of the battery pack, reduces the risk of accidental failure of the battery pack, and increases the safety of vehicle use.

[0055] Of course, for those skilled in the art, other structures of the vehicle and their working principles are understandable and achievable, and will not be described in detail in the present utility model.

[0056] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A battery tray (100), characterized in that: include: Tray body (10); A reinforcement member (20), wherein the reinforcement member (20) is arranged on at least one side of the tray body (10), and the reinforcement member (20) is a negative Poisson's ratio material member, and the Poisson's ratio of the reinforcement member (20) is less than -0.2, so as to enhance the thermal insulation and buffering performance of the battery tray (100).

2. The battery tray (100) according to claim 1, characterized in that: The closed cell ratio of the reinforcement (20) is greater than 70%.

3. The battery tray (100) according to claim 1, characterized in that: The density of the reinforcement (20) is less than or equal to 500 kg / m 3 .

4. The battery tray (100) according to claim 3, characterized in that: The density of the reinforcement (20) is less than or equal to 300 kg / m 3 .

5. The battery tray (100) according to claim 1, characterized in that: The reinforcement member (20) is provided with a concave structure (21).

6. The battery tray (100) according to claim 5, characterized in that: The concave structure (21) is a concave hexagonal honeycomb model, a concave triangle model or a star model.

7. The battery tray (100) according to claim 1, characterized in that: The reinforcing member (20) is arranged on the outer walls of the tray body (10) on two opposite sides, and the thickness of the reinforcing member (20) is 1-10 mm.

8. The battery tray (100) according to claim 7, characterized in that: The thickness of the reinforcement member (20) is 3-8 mm.

9. A battery pack, comprising the battery tray (100) according to any one of claims 1 to 8.

10. A vehicle, characterized in that: A battery pack comprising the battery pack of claim 9.

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