Plastic substrate and energy storage battery pack with same

Abstract

The utility model provides a plastic substrate and an energy storage battery pack with the same. The plastic substrate is provided with a connecting structure used for being connected with an external water cooling plate; the first surface of the plastic substrate is a discontinuous plane and is used for being in contact with the water cooling plate; at least part of the plastic substrate is a bearing plate, and a plurality of first concave parts and first convex parts which are distributed in a staggered mode are formed on the bearing plate in the direction of the first face. And a first extension part which is at least partially flush with the first surface extends from the inner bottom of at least part of the first concave part towards the first surface. The plastic substrate is used for bearing the energy storage battery pack with the water cooling plate, the requirements of heat dissipation, mechanical strength, light weight, low cost and the like are met, and the bearing requirement of the high-performance energy storage battery pack can be met.

Description

Technical Field

[0001] This utility model relates to the field of energy storage battery carrier technology, specifically to a plastic substrate and an energy storage battery pack having the same. Background Technology

[0002] With the rapid development of new energy technologies, especially the widespread adoption of electric vehicles and renewable energy storage systems, efficient and reliable energy storage systems have become crucial. As a core component, energy storage battery packs not only need to provide stable energy output but also must possess excellent heat dissipation performance and mechanical strength to ensure safe operation and extend service life. Traditional energy storage battery packs typically use metal materials as substrates. While metal materials have high thermal conductivity and mechanical strength, they are heavy, have a large overall load, are difficult to transport, and are costly.

[0003] Therefore, a substrate solution that simultaneously considers heat dissipation, mechanical strength, lightweight design, and low cost is needed to solve this problem. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model provides a plastic substrate and an energy storage battery pack having the same substrate. The plastic substrate supports the energy storage battery pack with a water-cooling plate. The specific technical solution is as follows:

[0005] In the first part, this utility model proposes a plastic substrate suitable for energy storage battery packs with water-cooled plates, wherein the plastic substrate is provided with a connection structure for connecting an external water-cooled plate.

[0006] The first surface of the plastic substrate is a discontinuous plane, used for contacting the water-cooling plate;

[0007] At least a portion of the plastic substrate is a carrier plate, and the carrier plate has a plurality of first recesses and first protrusions that are distributed in an alternating manner in the direction of the first surface;

[0008] At least a portion of the first recess extends toward the first surface from the bottom and has a first extension that is at least partially flush with the first surface.

[0009] In some specific embodiments, the plastic substrate further includes a connecting plate that connects to at least a portion of the edge of the carrier plate, and the connecting structure is located on the connecting plate.

[0010] In some specific embodiments, the support plate has a plurality of interleaved second recesses and second protrusions in the direction of the second surface; at least a portion of the second recesses have a second extension extending in the direction of the second surface that is at least partially flush with the second surface.

[0011] In some specific embodiments, one side of the connecting plate is flush with the first surface, and both the water-cooling plate and the connecting plate are provided with connecting holes, which are used to cooperate with preset connectors to realize the connection between the water-cooling plate and the connecting plate.

[0012] In some specific embodiments, the first recess and the second recess are distributed sequentially in a row;

[0013] The first extension is continuously distributed in each row of first recesses, and the second extension is continuously distributed in each row of second recesses to form a continuous reinforcing structure.

[0014] In some specific embodiments, the first protrusion forms the second recess on the second surface, and the second protrusion forms the first recess on the first surface.

[0015] In some specific embodiments, the plastic substrate contains glass fibers;

[0016] And / or, the plastic substrate is an integral injection molded structure.

[0017] In some specific embodiments, the thickness of the plastic substrate in the direction from the first surface to the second surface is 15-20 mm;

[0018] And / or, the wall thickness of the first extension is 2.0-3.5 mm;

[0019] And / or, the wall thickness of the second extension is 2.0-3.5 mm.

[0020] In some specific embodiments, the first extension and / or the second extension includes a combination of an X-shaped structure and a strip-shaped structure;

[0021] In each row of first and / or second recesses, multiple X-shaped structures are connected in sequence, and the strip structure is provided at intervals between two adjacent X-shaped structures.

[0022] The second part of this utility model proposes an energy storage battery pack, including a battery module, a water cooling plate, and a plastic substrate as described in any one of the first parts.

[0023] The water-cooled plate is connected to the battery module and the plastic substrate respectively.

[0024] This utility model has at least the following beneficial effects:

[0025] This invention discloses a plastic substrate and an energy storage battery pack incorporating it. The plastic substrate supporting the water-cooling plate in the energy storage battery pack balances requirements for heat dissipation, mechanical strength, lightweight design, and low cost. By incorporating a concave-convex structure and reinforcing structures (i.e., a first extension and a second extension) on the supporting plate, the mechanical strength and rigidity of the plastic substrate are significantly enhanced, enabling it to withstand the weight of the internal components of the battery pack and vibrations that may occur during operation, ensuring the overall structural stability and durability of the battery pack. The first recess, in conjunction with the protrusion at the bottom of the water-cooling plate, and the special design of the first and second extensions, promote heat exchange efficiency, helping to improve the heat dissipation performance of the water-cooling system and ensuring the safe operation of the battery pack under high-temperature conditions. The use of thermoplastic glass fiber reinforced flame-retardant material, combined with the concave-convex structure design, achieves a reduction in substrate weight while ensuring strength and heat dissipation, thus lowering production and operating costs. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic diagram of the first side structure of the plastic substrate provided by this utility model;

[0028] Figure 2 This is a schematic diagram of the second side structure of the plastic substrate provided by this utility model;

[0029] Figure 3 A three-dimensional cross-sectional schematic diagram of the plastic substrate provided by this utility model;

[0030] Figure 4 A schematic diagram of the structure of the first extension provided by this utility model;

[0031] Figure 5 A schematic diagram of the structure of the second extension provided by this utility model;

[0032] Figure 6 This is a schematic diagram showing the connection relationship of each part in the energy storage battery pack provided by this utility model.

[0033] Figure label:

[0034] 1-Plastic substrate; 2-Water-cooled plate; 3-Battery module; 4-Connecting structure; 4a-Bolt; 4b-Nut; 11-First recess; 12-First protrusion; 21-First extension; 22-Second extension. Detailed Implementation

[0035] Various embodiments of the present invention will be described more fully below. The present invention may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of the present invention to the specific embodiments disclosed herein, but rather the present invention should be understood to cover all adjustments, equivalents, and / or alternatives falling within the spirit and scope of the various embodiments of the present invention.

[0036] In the following, the terms “comprising” or “may include”, which may be used in various embodiments of the present invention, indicate the presence of the disclosed functions, operations, or elements, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in various embodiments of the present invention, the terms “comprising,” “having,” and their cognates are intended only to indicate a specific feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing, or the possibility of adding one or more combinations of features, numbers, steps, operations, elements, components, or combinations of the foregoing.

[0037] In various embodiments of this utility model, the expression "or" or "at least one of A and / or B" includes any combination or all combinations of the words listed simultaneously. For example, the expression "A or B" or "at least one of A and / or B" may include A, may include B, or may include both A and B.

[0038] The terms used in the various embodiments of this utility model (such as "first," "second," etc.) may modify various constituent elements in the various embodiments, but do not limit the corresponding constituent elements. For example, the above terms do not limit the order and / or importance of the elements. The above terms are only used for the purpose of distinguishing one element from other elements. For example, a first user device and a second user device refer to different user devices, although both are user devices. For example, without departing from the scope of the various embodiments of this utility model, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0039] It should be noted that, in this utility model, unless otherwise explicitly specified and defined, terms such as "installation," "connection," and "fixation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] Please refer to Figures 1 to 5 This utility model provides a plastic substrate for supporting energy storage battery packs. Its overall rigidity meets load-bearing requirements, effectively reducing dimensional warpage during injection molding and offering low cost. The specific solution is as follows:

[0041] A plastic substrate 1 is suitable for an energy storage battery pack having a water-cooling plate 2. The overall structure of the plastic substrate 1 is shown in the attached figure. Figure 1 and 2 As shown. A water-cooled plate 2 for cooling is provided at the bottom of the energy storage battery pack, and a connecting structure 4 for connecting the external water-cooled plate 2 is provided on the plastic substrate 1. In practical applications, the connecting structure 4 is set according to the structure of the water-cooled plate 2, and can adopt connection methods such as snap-fit ​​connection. The first surface of the plastic substrate 1 is used to contact the water-cooled plate 2, and the second surface is used to contact the bearing surface. The plastic substrate 1 is a flat plate structure, with the first and second surfaces being two opposing surfaces, namely the upper surface and the lower surface. The first surface is responsible for connecting the water-cooled plate 2, and the second surface is responsible for connecting the bearing surface. The first surface is shown in the attached figure. Figure 1 As shown, the second side is attached. Figure 2 As shown.

[0042] In this application, since the first surface is responsible for contacting the water-cooled plate 2, it is a discontinuous plane to ensure heat dissipation and reduce the contact area between the plastic substrate 1 and the water-cooled plate 2. The second surface, as the bottom surface of the plastic substrate, can be a continuous plane or a discontinuous plane. In practical applications, it can be flexibly set according to requirements to ensure the overall stability of the plastic substrate 1.

[0043] The substrate of this invention is made of plastic material. Compared with traditional metal materials, plastic material has a lower density, which can significantly reduce the overall weight of the product, especially important for fields requiring strict weight control. In practical applications, for water-cooled plates of energy storage battery packs of the same structure and size, the plastic substrate made using this invention reduces weight by about 60% compared to a metal stamping substrate, demonstrating significant weight reduction, while maintaining a cost comparable to metal stamping. Compared to an aluminum alloy substrate, it reduces weight by 14%, a slightly lower weight reduction than metal, but with a substantial cost decrease.

[0044] As a load-bearing component, the plastic substrate 1 needs to support the weight of the entire battery module 3, and therefore needs to meet certain mechanical properties. Specifically, at least a portion of the plastic substrate 1 is designed as a load-bearing plate, and this portion has a concave-convex structure, as shown in the attached figure. Figure 3As shown. This structure increases the effective surface area and structural complexity of the material by forming a first recess 11 and a first protrusion 12 on the first surface of the substrate, thereby improving the rigidity and strength of the material. The main function of the plastic substrate 1 is to support the battery pack and needs to be fixed to the battery pack. A connecting plate can be set separately, and the energy storage battery pack can be connected through the connecting structure 4 of the connecting plate. Alternatively, the connecting structure 4 can be set directly on the support plate, so that the plastic substrate 1 becomes a support plate as a whole.

[0045] In some specific embodiments, the plastic substrate 1 further includes a connecting plate that connects to at least a portion of the edge of the carrier plate, and the connecting structure 4 is located on the connecting plate. Figure 1 and 2 In the middle, the plastic substrate 1 is divided into two parts. One part is the carrier plate located in the middle area, as shown in the attached figure. Figure 1 and 2 Area A is one part, and the other part consists of connecting plates located on both sides, as shown in the attached diagram. Figure 1 and 2 In region B, a connecting structure 4 is provided on the connecting plate, and the energy storage battery pack is fixed to the plastic substrate 1 through the connecting plate. Furthermore, in some specific embodiments, one side of the connecting plate is flush with the first surface, and both the water-cooled plate 2 and the connecting plate are provided with connecting holes, which are used to cooperate with preset connectors to realize the connection between the water-cooled plate 2 and the connecting plate.

[0046] In some embodiments, the connecting structure 4 is located on the support plate and connects the energy storage battery pack through the support plate. The bottom surface of the water-cooled plate 2 has certain special features, and the recessed structure on the support plate can be matched according to the structure of the water-cooled plate 2 to achieve a snap-fit ​​connection with the water-cooled plate 2.

[0047] In this invention, the supporting plate has a concave-convex structure, with multiple first recesses 11 and multiple first protrusions 12 for contacting the water-cooling plate 2 formed on the first surface. The first recesses 11 and first protrusions 12 are staggered. The substrate cross-section adopts a concave-convex structure to increase the cross-sectional size. The staggered arrangement of the first recesses 11 and first protrusions 12 means that they are not directly aligned in space, but are arranged in an alternating manner. This layout helps to disperse stress and increase the stability of the structure. The cross-section of the concave-convex structure is shown in the attached figure. Figure 3 As shown.

[0048] Furthermore, a first extension 21, at least partially flush with the first surface, extends from the bottom of the first recess 11 toward the first surface. In some embodiments, the first extension 21 can divide the first recess 11 into multiple heat dissipation grooves, improving the heat dissipation effect. The first surface is used to contact the water-cooled plate 2. A receiving space is formed in the first recess 11, and the first extension 2 is disposed in the receiving space. The first extension 2 can contact the water-cooled plate 2 and play a certain supporting role, so that the first recess 11 also has a load-bearing capacity. While reducing the amount of material used and the overall weight, it further enhances the mechanical strength of the plastic substrate.

[0049] The first protrusion 12 can be a solid structure or a hollow structure. When the first protrusion 12 is a solid structure, its mechanical structure can be enhanced by filling it with a filler material with high mechanical strength. When the first protrusion 12 is a hollow structure, it needs to be filled with some special mechanical materials to enhance its mechanical properties.

[0050] In some embodiments, the carrier plate has a plurality of interleaved second recesses and second protrusions formed in the direction of the second surface; at least a portion of the second recesses have second extensions extending from their bottoms in the direction of the second surface, which are at least partially flush with the second surface. The concave-convex structure can be provided on both sides of the carrier plate to improve the mechanical strength of the plastic substrate. Alternatively, the carrier plate can be a single concave-convex structure, where the first recess 11 is the second protrusion and the first protrusion 12 is the second recess. Specifically, the first protrusion 12 forms the second recess on the second surface, and the second protrusion forms the first recess 11 on the first surface.

[0051] A first extension 21, flush with the first recess 11 (i.e., the second protrusion), extends from the bottom of the first recess 11 toward the first surface. A second extension 22, flush with the second surface, extends from the bottom of the second recess 11 (i.e., the first protrusion 12). The first extension 21 and the second extension 22 respectively form reinforcing structures in the first recess 11 and the second recess to enhance the strength of the bearing plate. The first recess 11 and the first extension 21 are shown in the attached figure. Figure 1 As shown, the first protrusion 12 and the second extension 22 are as attached. Figure 2 As shown. Simultaneously, a reinforcing structure is designed within the concave-convex structure to improve the overall strength of the base plate, further enhancing the strength and rigidity of the load-bearing plate. Furthermore, the reinforcing structure within the concave-convex structure effectively reduces dimensional warpage during injection molding, ensuring product dimensional accuracy.

[0052] Furthermore, the first extension 21 and the second extension 22 can have the same or different shapes and dimensions. In practical applications, the parameters of these structures can be adjusted according to specific application requirements and mechanical requirements to achieve optimal mechanical performance and functionality. (See attached...) Figure 4and attached Figure 5 In the middle, the first extension 21 and the second extension 22 have different structures.

[0053] Because the substrate is made of plastic, it can be processed into complex shapes through various processes such as injection molding, extrusion, and blow molding. This offers high design freedom, low processing costs, and a short production cycle, allowing for the creation of different structural forms as needed. This invention cleverly utilizes the material properties of plastic and the spatial structure of the substrate, not only improving the physical properties of the substrate but also giving it better thermal management performance and weight distribution, while reducing its weight, aligning with the trends of lightweighting and high efficiency. In some specific embodiments, the plastic substrate 1 is a one-piece injection-molded structure. All components of the substrate, including the support plate, connecting structure 4, and reinforcing structure, are formed in one piece in the same mold, eliminating the need for subsequent assembly or welding processes. The one-piece molding structure ensures a strong connection between the various parts of the substrate, avoiding seams or weak points that may occur in a split structure, thus improving the overall structural stability and reliability. Furthermore, the precision machining of the injection mold ensures the accuracy of the substrate dimensions, making it suitable for manufacturing plastic substrates 1 with complex geometries and high precision requirements.

[0054] In some embodiments, the first recess 11 and the second recess are arranged in a row, as shown in the attached figure. Figure 1 and 2 As shown, the first recess 11 and the second recess are arranged alternately in columns or rows; wherein, the first extension 21 is continuously distributed in each row of the first recess 11, and / or the second extension 22 is continuously distributed in each row of the second recess, so as to form a continuous reinforcing structure in the first recess 11 and the second recess. The continuous reinforcing structure can ensure the continuity of force transmission, avoid stress concentration, and improve the overall rigidity of the plastic substrate 1 to meet the load-bearing requirements.

[0055] Furthermore, the first extension 21 and / or the second extension 22 include X-shaped structures and strip structures; in each row of first recesses 11 and / or second recesses, multiple X-shaped structures are sequentially connected, and strip structures are spaced apart between adjacent X-shaped structures. (See attached...) Figure 1 and 2 In the middle, each row of the first recess is divided into multiple rectangular frames, and each rectangular frame is provided with an X-shaped reinforcing rib. Adjacent X-shaped structures are also connected by strip-shaped reinforcing ribs to ensure the continuity and stability of the connection between the X-shaped structures.

[0056] In some specific embodiments, the side of the first extension 21 facing the first surface is serrated, as shown in the attached figure. Figure 4As shown. The first surface is responsible for contacting the water-cooled plate 2. The first extension 21, acting as a reinforcing rib, directly contacts the water-cooled plate 2, appropriately reducing the contact area with the water-cooled plate 2 and increasing the heat dissipation space between the water-cooled plate 2 and the substrate, thus ensuring the heat dissipation effect of the water-cooled plate 2. The second surface is responsible for contacting the bearing surface, therefore the second extension 22 does not need to be set in this way and can be flush with the second surface, increasing the contact area between the plastic substrate 1 and the bearing surface and enhancing the stability of the bearing, as shown in the attached figure. Figure 2 As shown.

[0057] In some specific embodiments, the plastic substrate 1 incorporates glass fibers to enhance mechanical properties. Glass fibers possess characteristics such as high tensile strength, low density, high temperature resistance, and good chemical stability. The addition of glass fibers significantly improves the tensile strength, flexural strength, and rigidity of the substrate, enabling it to withstand greater loads without deformation or breakage. Specifically, the plastic substrate 1 utilizes a thermoplastic glass fiber reinforced flame-retardant material, combining the multiple advantages of thermoplastic plastics, glass fiber reinforcement, and flame-retardant properties. Thermoplastic plastics themselves have good thermal stability; with the addition of glass fiber reinforcement, this material can withstand higher operating temperatures and is less prone to structural integrity issues due to thermal deformation. Compared to metallic materials, thermoplastic glass fiber reinforced materials have lower density, contributing to reduced finished product weight. Thermoplastic glass fiber reinforced flame-retardant materials exhibit good resistance to corrosion, are relatively inexpensive, easy to process and mold, and suitable for mass production.

[0058] In some specific embodiments, the thickness of the plastic substrate 1 in the direction from the first surface to the second surface is 15-20 mm; and / or, the thickness (i.e., wall thickness) of the first extension 21 in the perpendicular direction from the first surface to the second surface is 2.0-3.5 mm; and / or, the thickness (i.e., wall thickness) of the second extension 22 in the perpendicular direction from the first surface to the second surface is 2.0-3.5 mm. In practical applications, the parameters of the plastic substrate 1 can be flexibly adjusted according to requirements.

[0059] This utility model also proposes an energy storage battery pack, including a battery module 3, a water-cooling plate 2, and the aforementioned plastic substrate 1; wherein, the water-cooling plate 2 connects the battery module 3 and the plastic substrate 1. The water-cooling plate 2 is responsible for cooling the battery module 3 and is located at the bottom of the battery module 3. The shape of the plastic substrate 1 conforms to the water-cooling plate 2, and can stably support the water-cooling plate 2 and the battery module 3. The battery module 3, the water-cooling plate 2, and the plastic substrate 1 are connected by bolts 4a and nuts 4b, as shown in the attached diagram. Figure 6 As shown.

[0060] This invention proposes a plastic substrate and an energy storage battery pack incorporating it. The plastic substrate supports the energy storage battery pack with a water-cooling plate, balancing requirements for heat dissipation, mechanical strength, lightweight design, and low cost. By incorporating a concave-convex structure and reinforcing structures (i.e., a first extension and a second extension) on the support plate, the mechanical strength and rigidity of the plastic substrate are significantly enhanced, enabling it to withstand the weight of the internal components of the battery pack and vibrations that may occur during operation, ensuring the overall structural stability and durability of the battery pack. The first recess, in conjunction with the protrusion at the bottom of the water-cooling plate, and the special design of the first and second extensions, promote heat exchange efficiency, helping to improve the heat dissipation performance of the water-cooling system and ensuring the safe operation of the battery pack under high-temperature conditions. The use of thermoplastic glass fiber reinforced flame-retardant material, combined with the concave-convex structure design, achieves a reduction in substrate weight while maintaining strength and heat dissipation effects, thus lowering production and operating costs.

[0061] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of a preferred embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this utility model.

[0062] Those skilled in the art will understand that the modules in the apparatus of the implementation scenario can be distributed within the apparatus of the implementation scenario as described, or they can be located in one or more apparatuses different from this implementation scenario, with corresponding changes. The modules of the above-described implementation scenario can be combined into one module, or they can be further divided into multiple sub-modules.

[0063] The serial numbers of the above-mentioned utility models are for descriptive purposes only and do not represent the superiority or inferiority of the implementation scenarios.

[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A plastic substrate, characterized by, The plastic substrate is suitable for an energy storage battery pack with a water-cooled plate, and a connecting structure for connecting an external water-cooled plate is arranged on the plastic substrate. A first surface of the plastic substrate is a discontinuous plane for contacting the water-cooled plate, and a second surface of the plastic substrate is for contacting a bearing surface. At least part of the plastic substrate is a bearing plate, and a plurality of first recesses and first protrusions are formed on the bearing plate and staggered in the direction of the first surface. A first extension part extending in the direction of the first surface is arranged at the bottom of at least part of the first recess.

2. The plastic substrate of claim 1, wherein The plastic substrate further comprises a connecting plate connected to at least part of the edge of the bearing plate, and the connecting structure is arranged on the connecting plate.

3. The plastic substrate of claim 1, wherein A plurality of second recesses and second protrusions are formed on the bearing plate in the direction of the second surface, and a second extension part extending in the direction of the second surface is arranged at the bottom of at least part of the second recess.

4. The plastic substrate of claim 2, wherein One side surface of the connecting plate is flush with the first surface, and a connecting hole is arranged on the water-cooled plate and the connecting plate, and the connecting hole is used to cooperate with a predetermined connecting part to realize the connection between the water-cooled plate and the connecting plate.

5. The plastic substrate of claim 3, wherein The first recesses and the second recesses are arranged in the form of rows. The first extension part is continuously arranged in each row of first recesses, and the second extension part is continuously arranged in each row of second recesses to form a continuous reinforcing structure.

6. The plastic substrate of claim 3, wherein The first protrusions form the second recesses on the second surface, and the second protrusions form the first recesses on the first surface.

7. The plastic substrate of claim 1, wherein The plastic substrate contains glass fibers. And / or, the plastic substrate is an integrally injection molded structure.

8. The plastic substrate of claim 3, wherein The thickness of the plastic substrate in the direction from the first surface to the second surface is 15-20 mm. And / or, the wall thickness of the first extension part is 2.0-3.5 mm. And / or, the wall thickness of the second extension part is 2.0-3.5 mm.

9. The plastic substrate of claim 5, wherein, The first extension part and / or the second extension part comprises a combination of X-shaped structures and strip-shaped structures. In each row of first recesses and / or second recesses, a plurality of X-shaped structures are sequentially connected, and the strip-shaped structures are arranged between adjacent two X-shaped structures.

10. An energy storage battery pack, characterized by, The plastic substrate comprises a battery module, a water-cooled plate, and any one of claims 1-9. The water-cooled plate is connected to the battery module and the plastic substrate, respectively.

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