Plate body, preparation method of plate body and battery pack

Abstract

The invention provides a plate body, a preparation method of the plate body and a battery pack, and relates to the technical field of battery packs, the plate body comprises a steel layer and a fiber reinforcement layer, the fiber reinforcement layer is connected with the steel layer, the fiber reinforcement layer comprises resin and a plurality of fiber segments, and the value range of the length of the fiber segments is 5mm-20mm. According to the plate body, the manufacturing process of the plate body is simplified, and the structural strength of the plate body is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a plate body, a method for preparing the plate body, and a battery pack. Background Art

[0002] The battery pack needs to be provided with a shell, and multiple battery modules are assembled in the shell to form a whole. In order to improve the anti-collision ability of the battery pack and ensure the safe and stable operation of the battery pack, a bottom guard plate is usually provided at the bottom of the shell for protection.

[0003] In the prior art, the plate body used to make the bottom guard plate is a steel plate, the surface of the steel plate is subjected to electrophoresis and plastic spraying treatments to make the bottom guard plate meet the corrosion resistance requirements, and then polyvinyl chloride (PVC) is sprayed on the surface of the steel plate to improve the structural strength of the bottom guard plate.

[0004] However, the manufacturing process of the above-mentioned plate body is relatively complicated, and the structural strength of the obtained plate body is relatively low. Summary of the invention

[0005] The present application provides a plate body, a method for preparing the plate body, and a battery pack, which are conducive to simplifying the manufacturing process of the plate body and improving the structural strength of the plate body.

[0006] In a first aspect, the present application provides a plate body, comprising: a steel layer; a fiber reinforced layer, the fiber reinforced layer is connected to the steel layer, the fiber reinforced layer comprises resin and a plurality of fiber segments, and the length of the fiber segment ranges from 5 mm to 20 mm.

[0007] In a possible implementation manner, the thickness of the steel layer is in the range of 0.7 mm to 1 mm; and / or the thickness of the fiber-reinforced layer is in the range of 0.8 mm to 1 mm.

[0008] In a possible implementation, the fiber segment is at least one of glass fiber and carbon fiber; and / or the resin is polyurethane.

[0009] In a possible implementation manner, the mass content of the fiber segment in the fiber reinforcement layer is in the range of 20%-50%; and / or the length of the fiber segment is in the range of 9 mm-11 mm.

[0010] In a possible implementation manner, the plate body further includes an energy absorbing layer, and the energy absorbing layer is located between the steel layer and the fiber reinforced layer.

[0011] In a possible implementation manner, the energy absorbing layer is at least one of a foam layer and a honeycomb layer.

[0012] In a second aspect, the present application provides a method for preparing a plate body, which is used to prepare any of the above-mentioned plates, including: cutting a continuous fiber roll according to a preset length to form a plurality of fiber segments; impregnating the plurality of fiber segments with resin to form a prepreg; and compounding the prepreg with a steel part to form a plate body.

[0013] In one possible implementation, the prepreg and the steel part are composited to form a plate body, including: spraying the prepreg on the surface of the lower mold of the mold; placing the steel part on the lower mold; buckling the upper mold and the lower mold of the mold, and curing for a preset time to form the plate body.

[0014] In a possible implementation manner, before placing the steel component on the lower mold, the method further includes: placing a foam component on the lower mold; and / or placing a honeycomb component on the lower mold.

[0015] In a third aspect, the present application provides a battery pack, comprising a plate body prepared by any plate body of the first aspect or any plate body preparation method of the second aspect, wherein the plate body constitutes a part of a shell of the battery pack.

[0016] The present application provides a plate body, a method for preparing a plate body, and a battery pack, wherein the plate body is provided with a steel layer and a fiber reinforced layer, wherein the fiber reinforced layer is composited by a resin and a plurality of fiber segments, and compared with PVC, the fiber reinforced layer formed by the resin and the fiber segments has the characteristics of high specific strength and large specific modulus, so when the PVC layer and the fiber reinforced layer are of the same quality, the structural strength of the fiber reinforced layer is greater, which is beneficial to improving the structural strength of the plate body without increasing the weight of the plate body, and at the same time, since the fiber reinforced layer also has good corrosion resistance and good durability, the corrosion resistance requirements of the bottom guard plate can be met by directly composited with the steel layer, and there is no need for additional electrophoresis or plastic spraying treatment on the surface of the steel layer, which is beneficial to simplifying the manufacturing process of the plate body, thereby saving the manufacturing cost of the plate body. If the fiber segment is a continuous fiber, although it can enhance the structural strength of the board, the plasticity of the formed fiber reinforced layer is poor. When the board needs to present a complex shape, the local bonding between the fiber reinforced layer and the steel layer may be poor, resulting in bulging and delamination of the fiber reinforced layer. Therefore, in order to avoid affecting the plasticity of the board, the length range of the fiber segment is set to 5mm-20mm, so that the fiber segment in the fiber reinforced layer forms non-continuous fibers. In this way, the structural strength of the fiber reinforced layer can be guaranteed without affecting the plasticity of the fiber reinforced layer. Therefore, the structural strength of the board provided by the present application is relatively high, and the corrosion resistance can meet the corrosion resistance requirements of the bottom guard plate of the battery pack. At the same time, the plasticity of the board is relatively strong. The bottom guard plate of the battery pack is formed by using the board, and the shape of the board can be flexibly adjusted according to the shape and needs of the battery pack. At the same time, it is beneficial to improve the protection ability of the bottom guard plate and ensure the safe and stable operation of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0018] Figure 1 A schematic diagram of the structure of the plate provided in the embodiment of the present application;

[0019] Figure 2 A schematic diagram of a process for preparing a plate provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of the process of compounding a prepreg and a steel part to form a plate body in the method for preparing a plate body provided in an embodiment of the present application.

[0021] Description of reference numerals:

[0022] 100-plate body;

[0023] 110- steel layer;

[0024] 120-fiber reinforcement layer;

[0025] 10- prepreg;

[0026] 20-Steel parts;

[0027] 30-mold; 31-upper mold; 32-lower mold;

[0028] 40-Injection head.

[0029] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0030] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0031] As shown in the background technology, in the prior art, the plate body used to make the bottom guard plate of the battery pack is a steel plate, and the surface of the steel plate is treated by electrophoresis and plastic spraying to make the bottom guard plate meet the corrosion resistance requirements, and then PVC is sprayed on the surface of the steel plate to improve the structural strength of the bottom guard plate.

[0032] However, the manufacturing process of the above-mentioned plate body is relatively complicated, and the structural strength of the obtained plate body is relatively low.

[0033] In response to the above technical problems, the embodiments of the present application provide a plate body, a method for preparing the plate body and a battery pack, wherein the plate body includes a steel layer and a fiber reinforced layer, wherein the fiber reinforced layer is composited by a resin and a plurality of fiber segments. Compared with PVC, the fiber reinforced layer formed by the resin and the fiber segments has the characteristics of high specific strength and large specific modulus. Therefore, when the PVC layer and the fiber reinforced layer are of the same quality, the structural strength of the fiber reinforced layer is greater, which is beneficial to improving the structural strength of the plate body without increasing the weight of the plate body. At the same time, since the fiber reinforced layer also has good corrosion resistance and good durability, the corrosion resistance requirements of the bottom guard plate can be met by directly compounding the fiber reinforced layer with the steel layer, and there is no need for additional electrophoresis or plastic spraying treatment on the surface of the steel layer, which is beneficial to simplify the manufacturing process of the plate body, thereby saving the manufacturing cost of the plate body.

[0034] If the fiber segment is a continuous fiber, although it can enhance the structural strength of the board, the plasticity of the formed fiber reinforced layer is poor. When the board needs to present a complex shape, the local bonding between the fiber reinforced layer and the steel layer may be poor, resulting in bulging and delamination of the fiber reinforced layer. Therefore, in order to avoid affecting the plasticity of the board, the length range of the fiber segment is set to 5mm-20mm, so that the fiber segment in the fiber reinforced layer forms non-continuous fibers. In this way, the structural strength of the fiber reinforced layer can be guaranteed without affecting the plasticity of the fiber reinforced layer. Therefore, the structural strength of the board provided by the present application is relatively high, and the corrosion resistance can meet the corrosion resistance requirements of the bottom guard plate of the battery pack. At the same time, the plasticity of the board is relatively strong. The bottom guard plate of the battery pack is formed by using the board, and the shape of the board can be flexibly adjusted according to the shape and needs of the battery pack. At the same time, it is beneficial to improve the protection ability of the bottom guard plate and ensure the safe and stable operation of the battery pack.

[0035] The following specific embodiments are used to describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings:

[0036] It should be noted that the plate provided in the embodiment of the present application can be applied to various structures, including but not limited to the shell of a battery pack.

[0037] See also Figure 1 As shown, the plate body 100 of the embodiment of the present application includes a steel layer 110 and a fiber reinforced layer 120, and the fiber reinforced layer 120 is connected to the steel layer 110, wherein the fiber reinforced layer 120 includes resin and a plurality of fiber segments, and the length of the fiber segment ranges from 5mm to 20mm.

[0038] In the embodiment of the present application, the fiber-reinforced composite material has the characteristics of high specific strength and large specific modulus. Therefore, in the case of the same volume or the same mass, the fiber-reinforced layer 120 formed by the resin and a plurality of fiber segments has a higher structural strength than the reinforcement layer formed by PVC, which is beneficial to improve the impact resistance of the board body 100 without increasing the weight of the board body 100. At the same time, since the fiber-reinforced composite material also has good corrosion resistance and durability, when manufacturing the board body 100, there is no need to electrophoretically or injection-mold the surface of the steel layer 110. The board body 100 obtained by only compounding the fiber-reinforced layer 120 on the surface of the steel layer 110 can have strong corrosion resistance, which is beneficial to simplify the manufacturing process of the board body 100, save the production cost of the board body 100, and improve the service life of the board body 100.

[0039] In a specific implementation, if the fiber segments in the fiber reinforced layer 120 are set as continuous fibers, although the strength of the board 100 can be improved, the plasticity of the fiber reinforced material formed by the resin and the continuous fibers is poor, and the bonding effect between the fiber reinforced layer 120 and the steel layer 110 is poor. When reinforcing ribs need to be set on the board 100 or the board 100 needs to be set to a more complex shape, bulging and delamination will occur between the fiber reinforced layer 120 and the steel layer 110, resulting in a significant impact on the performance of the board 100. Therefore, the embodiment of the present application sets the value range of the length of the fiber segment to 5mm-20mm. In this way, the fiber segment is a non-continuous fiber, and the length of the fiber segment can be 5mm, 7.5mm, 10mm, 12.5mm, 15mm, 17.5mm or 20mm. Of course, the embodiments of the present application do not impose any restrictions on this. The length of the fiber segment can be reasonably selected within the above range as needed. The fiber reinforced layer 120 formed by the fiber segment within this length range can not only meet the structural strength needs of the plate body 100, but also has strong plasticity. Even if the plate body 100 needs to be set to a more complex shape, such as setting grooves, reinforcing ribs, etc. on the plate body 100, the fiber reinforced layer 120 can also fit with the steel layer 110 everywhere, thereby ensuring the stability of the connection between the fiber reinforced layer 120 and the steel layer 110, which is beneficial to ensuring the impact resistance of the plate body 100.

[0040] Therefore, the board body 100 provided in the embodiment of the present application and the fiber reinforced layer 120 have a stronger structural strength than the reinforced layer formed by PVC in the prior art, which is conducive to improving the overall strength of the board body 100 without increasing the volume and weight of the board body 100, and improving the impact resistance of the board body 100. The fiber reinforced layer 120 has strong corrosion resistance and does not require additional electrophoresis or injection molding treatment, which is conducive to simplifying the manufacturing process of the board body 100 and saving the manufacturing cost of the board body 100. In addition, the plasticity of the board body 100 in the embodiment of the present application will not be affected by the fiber reinforced layer 120. On the premise of increasing the structural strength of the board body 100, it can still be flexibly set to a variety of shapes, and has a wide range of applications.

[0041] It should be noted that the plate body 100 provided in the embodiment of the present application can be applied to a variety of different fields. As long as the structure of the plate body 100 with high strength and strong corrosion resistance is required, it can be used. For example, the plate body 100 can be applied to a battery pack. When the plate body 100 is used as the bottom guard plate of the battery pack, it can effectively improve the protection capability of the bottom guard plate of the battery pack, thereby ensuring the safe and stable operation of the battery pack.

[0042] In some possible implementations, see Figure 1 As shown, the thickness of the steel layer 110 in the embodiment of the present application ranges from 0.7 mm to 1 mm; the thickness of the fiber reinforced layer 120 ranges from 0.8 mm to 1 mm.

[0043] It is understandable that if the thickness of the steel layer 110 or the fiber reinforced layer 120 is too low, the strength of the plate body 100 may be too low, and the impact resistance may be difficult to meet the requirements. If the thickness of the steel layer 110 or the fiber layer is too high, the overall weight of the plate body 100 may be too heavy. Therefore, it is necessary to set the thickness range of the steel layer 110 to 0.7mm-1mm, and the thickness range of the fiber reinforced layer 120 to 0.8mm-1mm, wherein the thickness of the steel layer 110 can be 0.7mm, 0.8mm, 0.9mm or 1mm, and the thickness of the fiber reinforced layer 120 can be 0.8mm, 0.85mm, 0.9mm, 0.95mm or 1mm. Of course, the embodiment of the present application does not limit the specific thickness of the steel layer 110 and the fiber reinforced layer 120, and the thickness of the steel layer 110 and the fiber reinforced layer 120 can be reasonably selected within the above range as needed.

[0044] In some possible implementations, see Figure 1 As shown, the fiber segment of the embodiment of the present application is at least one of glass fiber and carbon fiber; and the resin is polyurethane.

[0045] In some embodiments, the fiber reinforced layer 120 is composited by polyurethane and glass fiber, or composited by polyurethane and carbon fiber. The fiber reinforced layer 120 formed in this way has high strength, good corrosion resistance, and light weight. While meeting the strength and corrosion resistance requirements of the board body 100, it is beneficial to further reduce the weight of the board body 100. At the same time, the fiber reinforced layer 120 of the embodiment of the present application has good electrical insulation properties and strong high temperature resistance, which can better meet the needs of the bottom guard plate of the battery pack and is beneficial to ensuring the stable operation of the battery pack.

[0046] In some possible implementations, see Figure 1 As shown, the mass content of the fiber segment in the fiber reinforcement layer 120 of the embodiment of the present application ranges from 20% to 50%; the length of the fiber segment ranges from 9 mm to 11 mm.

[0047] In some embodiments, in order to meet the structural strength requirements of the fiber reinforced layer 120 without affecting the plasticity of the fiber reinforced layer 120, the mass content of the fiber segment in the fiber reinforced layer 120 can be set in the range of 20%-50%, and the length of the fiber segment can be set in the range of 9mm-11mm, wherein the mass content of the fiber segment can be 20%, 25%, 30%, 35%, 40%, 45% or 50%, and the length of the fiber segment can be 9mm, 9.5mm, 10mm, 10.5mm or 11mm. Of course, the embodiments of the present application do not limit the specific mass content and length of the fiber segment, and the mass content and length of the fiber segment can be reasonably selected within the above range as needed.

[0048] In some possible implementations, see Figure 1 As shown, the plate body 100 of the embodiment of the present application further includes an energy absorbing layer, which is located between the steel layer 110 and the fiber reinforced layer 120 .

[0049] In specific implementation, an energy absorbing layer may be provided between the steel layer 110 and the fiber reinforced layer 120. When the fiber reinforced layer 120 is impacted, the fiber reinforced layer 120 transmits the device force to the energy absorbing layer. The energy absorbing layer may absorb part of the energy generated by the impact to reduce the force transmitted to the steel layer 110, thereby reducing the possibility of deformation of the steel layer 110, which is beneficial to further improve the impact resistance of the plate body 100. Due to the limitation of the material, the energy absorbing layer may not be directly cured with the steel layer 110 or the fiber reinforced layer 120. In this case, a structural adhesive may be applied on the surface of the energy absorbing layer to bond the energy absorbing layer between the steel layer 110 and the fiber reinforced layer 120 to ensure the stability of the connection between the energy absorbing layer and the steel layer 110 and the fiber reinforced layer 120.

[0050] In some possible implementations, see Figure 1As shown, the energy absorbing layer of the embodiment of the present application is at least one of a foam layer and a honeycomb layer.

[0051] It should be noted that the foam layer is light in weight, has high rigidity, and has good thermal insulation and heat preservation properties. When higher requirements are placed on the rigidity and heat insulation properties of the board body 100, the energy absorption layer can be set as a foam layer. The honeycomb layer has higher strength and rigidity, and can better make the steel layer 110 and the fiber reinforced layer 120. Therefore, when higher requirements are placed on the strength of the board body 100, or the size of the board body 100 is large, the energy absorption layer can be a honeycomb layer, and the material of the energy absorption layer can be polyurethane or other materials. The embodiment of the present application does not limit the specific material and structure of the energy absorption layer, and can be selected according to the actual needs of the board body 100.

[0052] See also Figure 1 , Figure 2 and Figure 3 As shown, the embodiment of the present application also provides a method for preparing a plate body, which is used to prepare any of the above-mentioned plate bodies 100, comprising the following steps:

[0053] S101, cutting the continuous fiber roll into a plurality of fiber segments according to a preset length;

[0054] S102, impregnating a plurality of fiber segments with resin to form a prepreg 10;

[0055] S103 , compounding the prepreg 10 and the steel member 20 to form a plate body 100 .

[0056] In the embodiment of the present application, since the prepreg 10 is in liquid state, the steel part 20 needs to be preformed according to the actual needs of the plate body 100, and then the prepreg 10 and the preformed steel part 20 are compounded to form the plate body 100, so that the shape of the fiber reinforcement layer 120 formed in this way can be completely fitted with the steel part 20, which is conducive to ensuring the strength enhancement effect of the fiber reinforcement layer 120. At the same time, compared with the prior art, the preparation method of the plate body in the embodiment of the present application, after the prepreg 10 is prepared, only the prepreg 10 and the steel part 20 need to be compounded to obtain the plate body 100, without the need for additional operations such as electrophoresis and spraying, which effectively simplifies the production steps of the plate body 100 and helps save the production cost of the plate body 100.

[0057] In some possible implementations, see Figure 1 , Figure 2 and Figure 3 As shown, in the embodiment of the present application, the prepreg 10 and the steel part 20 are compounded to form a plate body 100, including:

[0058] S201, spraying the prepreg 10 on the surface of the lower mold 32 of the mold 30;

[0059] S202, placing the steel part 20 on the lower die 32;

[0060] S203, buckling the upper mold 31 and the lower mold 32 of the mold 30, and curing for a preset time to form the plate body 100;

[0061] S204 , separating the board body 100 from the mold 30 to take out the board body 100 .

[0062] In the specific implementation, after the continuous fiber roll is cut into a plurality of fiber segments according to a preset length, the fiber segments can be transported to the mixing head to be impregnated with polyurethane to obtain the prepreg 10. The shape of the preformed steel part 20 matches the lower mold 32. The prepreg 10 is sprayed on the lower mold 32 through the spray head 40. Then, the steel part 20 is placed in the lower mold 32 coated with the prepreg 10. The upper mold 31 and the lower mold 32 are buckled to pressurize the steel part 20. After curing for a preset time, the prepreg 10 forms a fiber reinforced layer 120, and the steel part 20 forms a steel layer 110. The fiber reinforced layer 120 and the steel layer 110 are combined to form a plate body 100. Finally, the plate body 100 is demoulded from the mold 30 and can be used for assembly. It can be seen that the prepreg 10 only needs to be sprayed on the mold 30 to be cured to form the corresponding plate body 100, which is convenient to operate and is conducive to improving the preparation efficiency of the plate body 100.

[0063] In some possible implementations, see Figure 1 , Figure 2 and Figure 3 As shown, before placing the steel part 20 on the lower mold 32 in the embodiment of the present application, the method further includes: placing a foam part on the lower mold 32 ; and / or placing a honeycomb part on the lower mold 32 .

[0064] It is understandable that if a foam layer or a honeycomb layer is required between the steel layer 110 and the fiber reinforced layer 120, the foam part or the honeycomb part can be placed on the lower mold 32 after spraying the prepreg 10, and then the steel part 20 can be placed on the foam part or the honeycomb part. In order to ensure the connection stability between the foam layer or the honeycomb layer and the steel layer 110, a glue layer can also be placed before placing the steel part 20. During the curing process, the glue layer melts to stably connect the steel layer 110 with the foam layer or the honeycomb layer. In this way, the preparation of the energy absorbing layer can be completed by adding only one step of discharging, which is simple to operate and has high preparation efficiency.

[0065] See also Figure 1 and Figure 2 As shown, an embodiment of the present application further provides a battery pack, comprising any of the above-mentioned plates 100 or a plate 100 prepared by any of the plate preparation methods; the plate 100 constitutes a part of the shell of the battery pack.

[0066] The structure of the plate body 100 and the working principle of the method for preparing the plate body are described in detail in the above embodiments, and will not be described in detail here.

[0067] In an embodiment of the present application, a battery pack may include a shell and a battery cell module, wherein the shell forms a accommodating cavity, and the battery cell module is fixed in the accommodating cavity. The plate body 100 may constitute the entire shell, or may be only arranged at the bottom of the shell to form a bottom guard plate of the battery pack. The embodiment of the present application does not limit this. By providing the above-mentioned plate body 100, the collision resistance of the shell of the battery pack can be improved, and the possibility of deformation of the shell can be reduced, thereby effectively protecting the battery cell module in the accommodating cavity and ensuring that the battery pack can operate safely and stably.

[0068] In summary, the embodiment of the present application provides a plate body 100, a method for preparing the plate body, and a battery pack. When preparing the plate body 100, first, the continuous fiber is cut into a plurality of fiber segments with a length ranging from 5 mm to 20 mm, and then the plurality of fiber segments are impregnated with resin to form a prepreg 10, the prepreg 10 is sprayed on the lower mold 32, and the preformed steel part 20 is placed in the lower mold 32 coated with the prepreg 10, and the upper mold 31 and the lower mold 32 are buckled and cured for a certain period of time to obtain the plate body 100. After the prepreg 10 is cured, the fiber reinforcement of the plate body 100 is formed. The steel layer 110 of the plate body 100 is formed by the steel part 20. The fiber reinforced layer 120 has a high specific strength. Therefore, without increasing the weight and volume of the plate body 100, the structural strength of the plate body 100 can be effectively improved, thereby improving the impact resistance of the plate body 100. At the same time, the length of the fiber segment is set within the range of 5mm-20mm, so that the fiber segment in the fiber reinforced layer 120 can be a non-continuous fiber, which is conducive to ensuring the plasticity of the fiber reinforced layer 120 and ensuring that the plate body 100 can be made into different shapes as needed. When at least part of the shell of the battery pack is formed by the above-mentioned plate body 100, the anti-collision ability of the battery pack can be effectively improved, the battery cell module in the battery pack can be protected, and the battery pack can be ensured to operate safely and stably.

[0069] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be 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 embodiments of the present application can be understood according to specific circumstances.

[0070] In the embodiments of the present application, the devices or elements referred to or implied must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise precisely and specifically specified.

[0071] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0072] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0073] The term "plurality" in this article refers to two or more than two. The term "and / or" in this article is just a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0074] It should be understood that the various numerical numbers involved in the embodiments of the present application are only used for the convenience of description and are not used to limit the scope of the embodiments of the present application.

[0075] It can be understood that in the embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0076] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0077] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A plate body (100), characterized in that: include: Steel layer (110); A fiber reinforced layer (120), the fiber reinforced layer (120) being connected to the steel layer (110), the fiber reinforced layer (120) comprising resin and a plurality of fiber segments, the length of the fiber segments being in the range of 5 mm to 20 mm.

2. The plate body (100) according to claim 1, characterized in that: The thickness of the steel layer (110) ranges from 0.7 mm to 1 mm; and / or, The thickness of the fiber-reinforced layer (120) is in the range of 0.8 mm to 1 mm.

3. The plate body (100) according to claim 1, characterized in that: The fiber segment is at least one of glass fiber and carbon fiber; and / or, The resin is polyurethane.

4. The plate body (100) according to claim 1, characterized in that: The mass content of the fiber segments in the fiber reinforced layer (120) is in the range of 20% to 50%; and / or, The length of the fiber segment ranges from 9 mm to 11 mm.

5. The plate (100) according to any one of claims 1 to 4, characterized in that: The plate body (100) further comprises an energy absorbing layer, wherein the energy absorbing layer is located between the steel layer (110) and the fiber reinforced layer (120).

6. The plate body (100) according to claim 5, characterized in that: The energy absorbing layer is at least one of a foam layer and a honeycomb layer.

7. A method for preparing a plate, characterized in that: Used to prepare the plate body (100) according to any one of claims 1 to 6, comprising: Cutting the continuous fiber roll into a plurality of fiber segments according to a preset length; impregnating the plurality of fiber segments with resin to form a prepreg (10); The prepreg (10) and the steel part (20) are compounded to form the plate body (100).

8. The method for preparing a plate according to claim 7, characterized in that: The step of compounding the prepreg (10) and the steel part (20) to form the plate body (100) comprises: Spraying the prepreg (10) onto the surface of a lower mold (32) of a mold (30); placing the steel part (20) on the lower die (32); The upper mold (31) of the mold (30) is buckled with the lower mold (32), and cured for a preset time to form the plate body (100).

9. The method for preparing a plate according to claim 7, characterized in that: Before placing the steel part (20) on the lower die (32), the method further comprises: placing a foam piece on the lower mold (32); and / or, The honeycomb member is placed on the lower mold (32).

10. A battery pack, characterized in that: A plate body (100) comprising the plate body (100) according to any one of claims 1 to 6 or prepared by the method for preparing a plate body according to any one of claims 7 to 9; The plate body (100) constitutes a part of the shell of the battery pack.

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