Protective plate and battery pack

Abstract

The embodiment of the application is applied to the field of batteries, and specifically provides a protection plate and a battery pack. The protection plate comprises a first reinforcing layer, a middle composite layer and a second reinforcing layer which are sequentially stacked and fixedly connected; the first reinforcing layer is located at a first side of the middle composite layer, and the second reinforcing layer is located at a second side of the middle composite layer; the first reinforcing layer comprises an inner reinforcing part and an outer filling part which is annularly arranged outside the inner reinforcing part, and / or the second reinforcing layer comprises an inner reinforcing part and an outer filling part which is annularly arranged outside the inner reinforcing part; an area surrounded by an outer edge of the inner reinforcing part is S(11) mm 2 , an area of the outer filling part is S(12) mm 2 , and S(11) / S(12) satisfies 0.3≤S(11) / S(12)≤1. The protection plate not only can effectively resist high-strength ball hitting, but also has a relatively low overall weight, and can effectively reduce the overall weight of the battery pack.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to a protection board and a battery pack. Background Technology

[0002] Currently, the battery packs of electric vehicles are mostly fixed to the vehicle chassis. Once the bottom of the vehicle is impacted, especially under severe conditions such as bottoming out or puncture, the outer shell of the power battery pack may deform under stress, leading to severe deformation of the battery pack and potentially causing a safety accident. Therefore, battery pack protection is particularly important.

[0003] In existing technologies, a thick bottom guard plate is typically installed at the bottom of the battery pack. This bottom guard plate bears the weight of the individual battery cells and absorbs the impact energy generated by external collisions, thus protecting the battery cells inside the battery pack. However, existing bottom guard plates not only have difficulty withstanding large-scale impacts and poor buffering and energy absorption capabilities, making the internal battery cells prone to significant deformation, but they also cannot withstand localized punctures and are easily punctured by sharp objects, resulting in damage. Therefore, their protection performance for the internal battery cells is insufficient to meet the requirements of some harsh operating conditions. Utility Model Content

[0004] In view of this, the present application aims to provide a protective plate and battery pack to solve the technical problems of existing bottom protective plates that are unable to withstand large-intensity impacts, have poor buffering and energy absorption capabilities, are also unable to withstand local punctures, and are easily punctured by sharp objects.

[0005] A first aspect of this application provides a protective plate, comprising a first reinforcing layer, an intermediate composite layer, and a second reinforcing layer that are stacked and fixedly connected in sequence; the first reinforcing layer is located on a first side of the intermediate composite layer, and the second reinforcing layer is located on a second side of the intermediate composite layer. The first reinforcing layer includes an inner reinforcing portion and an outer filling portion surrounding the outer side of the inner reinforcing portion, and / or, the second reinforcing layer includes an inner reinforcing portion and an outer filling portion surrounding the outer side of the inner reinforcing portion; the area enclosed by the outer edges of the inner reinforcing portion is S(11) mm. 2 The area of ​​the outer filling part is S(12) mm. 2 S(11) / S(12) satisfies 0.3≤S(11) / S(12)≤1.

[0006] Another aspect of this application provides a battery pack including the aforementioned reinforcing plate.

[0007] Compared to existing protection plates, the protection plate of the above embodiments of this application can not only effectively withstand high-intensity ball impacts, but also has better cushioning capabilities. When applied to the bottom protection plate of the battery pack, it can effectively reduce the impact on the internal battery cells and reduce the impact force transmitted to the battery cells, thereby reducing the impact deformation of the internal battery cells. Moreover, it has high puncture resistance and is not easily damaged by punctures. It can also effectively ensure the airtightness of the battery pack, improve the protection effect on the battery cells, avoid dangerous situations such as fire and explosion of the battery pack, effectively improve the working safety of the battery pack, and the overall weight of the protection plate of the embodiments of this application is low, which can effectively reduce the overall weight of the battery pack. Attached Figure Description

[0008] It should be understood that the following figures only show some embodiments of this application and should not be regarded as a limitation on the scope.

[0009] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0010] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0011] Figure 1 This is an exploded view of the reinforcing plate according to an embodiment of this application.

[0012] Figure 2 This is an exploded view of another reinforcing plate according to an embodiment of this application.

[0013] Figure 3 This is a front view of the first or second reinforcing layer in an embodiment of this application.

[0014] Figure 4 This is an exploded view of another reinforcing plate according to an embodiment of this application.

[0015] Figure 5 This is a front view of another first or second reinforcing layer according to an embodiment of this application.

[0016] Figure 6 This is an exploded view of another reinforcing plate according to an embodiment of this application.

[0017] Figure 7 This is a schematic diagram of the continuous fiber structure of the thermoplastic fiber composite material according to an embodiment of this application.

[0018] Figure 8 This is an exploded view of another reinforcing plate according to an embodiment of this application.

[0019] Figure 9 This is an exploded view of another reinforcing plate according to an embodiment of this application.

[0020] Attached image labels: 11. First reinforcing layer; 12. Second reinforcing layer; 13. Inner reinforcing part; 14. Outer filling part; 15. Inner filling part; 16. Opening; 21. Intermediate composite layer; 22. First composite layer; 23. Second composite layer; 31. Reinforcing coating; 41. Continuous fiber.

[0021] X - First side; Y - Second side. Detailed Implementation

[0022] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] This application provides a protective plate that can serve as a bottom protective plate for a battery pack, protecting the bottom surface of the battery pack and reducing the impact of external bumps on the individual battery cells inside the battery pack.

[0025] The battery pack of this application embodiment comprises a battery pack, a battery management system, a thermal management system, an electrical connection system, structural components, and protective components, all housed within a casing and sealed with a cover, forming a complete functional unit capable of directly outputting electrical energy. The battery pack is formed by multiple battery cells connected in series and / or parallel. The electrical connection system includes high-voltage connectors, low-voltage connectors, and wiring harnesses. The structural components include a housing and a support frame. This battery pack, as a rechargeable battery, can serve as a power source for new energy vehicles. The battery pack of this application embodiment may also include an isolation plate, with both the battery cells and the isolation plate located within the casing. The isolation plate is located on the side of the battery cell away from the bottom protective plate of the casing, separating the battery cell from other components located above it, thus providing isolation.

[0026] Specifically, the aforementioned enclosure can be a closed or semi-closed structure made of materials such as metal or plastic. It serves as the physical carrier of the battery pack, and its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The enclosure provides installation space for the battery pack, BMS, cooling system, electrical connection components, etc., and through reasonable structural design, fixes these components inside the enclosure to ensure that they maintain a relatively stable position during battery pack operation, avoiding damage to components or loosening of connections due to vibration, impact, or other factors.

[0027] The enclosure may include a lower enclosure and an upper enclosure. The lower enclosure includes a bottom protective plate and a frame connecting to and surrounding the bottom protective plate. The upper enclosure is connected to the frame and has a cover plate opposite to the bottom protective plate. The upper and lower enclosures together form a receiving cavity. The frame and the bottom protective plate can be integrally formed or processed separately and then fixedly connected. Specifically, the frame and the bottom protective plate are fixedly connected by welding, riveting, screwing, etc. When the enclosure is cubic, the frame of the lower enclosure generally has four side plates surrounding the perimeter of the bottom protective plate. In other embodiments, the shape of the enclosure can also be cylindrical or other shapes. The frame mainly serves to support, protect, and connect. The frame can be formed by splicing multiple beams together. The frame can be rectangular, circular, polygonal, etc., without limitation. The beams of the frame can be solid structures or contain cavities. The bottom protective plate is the main load-bearing component of the battery pack, used to support and fix the battery pack, battery management system, cooling system, and other components inside the battery pack.

[0028] like Figures 1 to 9 As shown, the protective plate of this application embodiment includes at least a first reinforcing layer 11, an intermediate composite layer 21 and a second reinforcing layer 12 that are stacked and fixedly connected in sequence; the first reinforcing layer 11 is located on the first side of the intermediate composite layer 21, and the intermediate composite layer 21 is constructed to be made of thermoplastic fiber composite material; the second reinforcing layer 12 is located on the second side of the intermediate composite layer 21.

[0029] like Figure 1 and Figure 2 As shown, in one embodiment of this application, the first reinforcing layer 11 includes an inner reinforcing portion 13 and an outer filling portion 14 surrounding the outer side of the inner reinforcing portion 13, and / or, the second reinforcing layer 12 includes an inner reinforcing portion 13 and an outer filling portion 14 surrounding the outer side of the inner reinforcing portion 13.

[0030] It is understood that the inner reinforcing part 13 can be made of steel to ensure the structural strength of the first reinforcing layer 11, the intermediate composite layer 21 and the second reinforcing layer 12. The intermediate composite layer 21 and the outer filling part 14 can be made of thermoplastic fiber composite material. The thermoplastic fiber composite material is composed of continuous fibers 41 and thermoplastic resin matrix. The continuous fibers 41 serve as reinforcement to provide structural strength, and the thermoplastic resin matrix serves to heat set and enhance toughness. During the molding process of the protective plate, the thermoplastic fiber composite material can effectively bond and fix the first reinforcing layer 11 and the second reinforcing layer 12 on both sides together after melting, so that the protective plate of this embodiment forms a whole. The outer filling part 14 made of thermoplastic fiber composite material can effectively fill the external space of the inner reinforcing part 13 and provide a certain structural strength and puncture resistance, and can also effectively reduce the overall weight of the first reinforcing layer 11 and the second reinforcing layer 12.

[0031] like Figure 3 As shown, in one embodiment of this application, the area enclosed by the outer edge of the inner reinforcing portion 13 is S(11) mm. 2 The area of ​​the outer filling part 14 is S(12) mm. 2 S(11) / S(12) satisfies 0.3≤S(11) / S(12)≤1. When the ratio S(11) / S(12) of the area enclosed by the outer edge of the inner reinforcing part 13 to the area S(12) of the outer filling part 14 is less than 0.3, the area covered by the inner reinforcing part 13 is too small and cannot provide sufficient protective area. When the ratio S(11) / S(12) of the area enclosed by the outer edge of the inner reinforcing part 13 to the area S(12) of the outer filling part 14 is greater than 1, the area covered by the inner reinforcing part 13 is relatively large, and the weight of the first reinforcing layer 11 and / or the second reinforcing layer 12 is large.

[0032] Therefore, when the ratio S(11) / S(12) of the area S(11) enclosed by the outer edge of the inner reinforcing part 13 to the area S(12) of the outer filling part 14 satisfies 0.3≤S(11) / S(12)≤1, the inner reinforcing part 13 can cover a sufficient area, thereby effectively ensuring the structural strength of the protective layer with the inner reinforcing part 13 and the outer filling part 14. This ensures that the protective capability of each area of ​​the protective plate in this embodiment meets the requirements while effectively reducing the overall weight of the protective plate in this embodiment. In a specific embodiment, the ratio S(11) / S(12) of the area S(11) enclosed by the outer edge of the inner reinforcing part 13 to the area S(12) of the outer filling part 14 can be selected from specific values ​​such as 0.3, 0.38, 0.46, 0.53, 0.6, 0.69, 0.76, 0.84, 0.9, 1.0, etc., which are not limited here.

[0033] Compared to existing protection plates, the protection plate of this application embodiment can not only effectively withstand high-intensity ball impacts, but also has better cushioning capabilities. When applied to the bottom protection plate of the battery pack, it can effectively reduce the impact on the internal battery cells and reduce the impact force transmitted to the battery cells, thereby reducing the impact deformation of the internal battery cells. Moreover, it has high puncture resistance and is not easily damaged by punctures. It can also effectively ensure the airtightness of the battery pack, improve the protection effect on the battery cells, avoid dangerous situations such as fire and explosion of the battery pack, effectively improve the working safety of the battery pack, and the overall weight of the protection plate of this application embodiment is low, which can effectively reduce the overall weight of the battery pack.

[0034] Specifically, such as Figure 2 and Figure 3 As shown, in one embodiment of this application, the inner reinforcing portion 13 is rectangular in shape, and the outer filling portion 14 is U-shaped. In this way, the inner reinforcing portion 13 can effectively cover the central area of ​​the protective plate that is easily impacted and deforms significantly after impact, while the U-shaped outer filling portion 14 can effectively fill the external space of the inner reinforcing portion 13. Furthermore, since the inner reinforcing portion 13 is rectangular and the outer filling portion 14 is U-shaped, the cutting steps and material waste of the inner reinforcing portion 13 and the outer filling portion 14 can be effectively reduced, thereby lowering the processing cost of the protective plate in this embodiment of the application.

[0035] like Figure 4 and Figure 5 As shown, in one embodiment of this application, at least one opening 16 is provided on the inner reinforcing part 13; the opening 16 of the inner reinforcing part 13 is filled with an inner filling part 15. By providing the opening 16 on the inner reinforcing part 13 and filling it with the inner filling part 15, the weight of the inner reinforcing part 13 can be effectively reduced without significantly reducing the structural strength of the inner reinforcing part 13, thereby reducing the overall weight of the protective plate in this embodiment of the application. The inner filling part 15 can effectively fill the opening 16 on the inner reinforcing part 13, thereby effectively providing a cushioning effect.

[0036] Specifically, the inner filling portion 15 can be made of thermoplastic resin. During the molding process of the protective plate in this embodiment, part of the thermoplastic resin matrix in the thermoplastic fiber composite material can enter the opening 16 on the inner reinforcing portion 13, thereby forming the aforementioned inner filling portion 15 made of thermoplastic resin.

[0037] Specifically, in one embodiment of this application, the area of ​​the opening 16 is S(21) mm. 2 The area of ​​the internal reinforcing part 13 is S(22) mm. 2S(21) / S(22) satisfies 0.01 ≤ S(21) / S(22) ≤ 0.7. When the ratio S(21) / S(22) of the area of ​​the opening 16 to the area S(22) of the inner reinforcing part 13 is greater than 0.7, the area occupied by the opening 16 is too large, which can easily have a significant impact on the structural strength of the inner reinforcing part 13; when the ratio S(21) / S(22) of the area of ​​the opening 16 to the area S(22) of the inner reinforcing part 13 is less than 0.01, the area occupied by the opening 16 is too small, which has a poor effect on the weight reduction of the inner reinforcing part 13.

[0038] Therefore, when the ratio S(21) / S(22) of the area S(21) of the opening 16 to the area S(22) of the inner reinforcing part 13 satisfies 0.01 ≤ S(21) / S(22) ≤ 0.7, it can reduce the impact on the structural strength of the inner reinforcing part 13 and effectively reduce the weight of the inner reinforcing part 13, thereby reducing the overall weight of the protective plate. In a specific embodiment, the ratio S(21) / S(22) of the area S(21) of the opening 16 to the area S(22) of the inner reinforcing part 13 can be selected from specific values ​​such as 0.01, 0.05, 0.12, 0.23, 0.34, 0.45, 0.56, 0.67, 0.69, 0.7, etc., and is not limited here.

[0039] like Figure 5 As shown, in one embodiment of this application, multiple openings 16 are provided, and the multiple openings 16 are configured to be arranged in an array along a first preset direction and a second preset direction. Since the multiple openings 16 are arranged in an array along the first preset direction and the second preset direction, the overall area occupied by the openings 16 can be effectively guaranteed, and the area of ​​a single opening 16 can be reduced, thereby ensuring that the openings 16 can be evenly distributed on the inner reinforcing part 13, thereby reducing the impact on the overall protective capability of the inner reinforcing part 13.

[0040] Specifically, such as Figure 5 As shown, in one embodiment of this application, when the plurality of openings 16 are arranged in an array along a first preset direction and a second preset direction, the first preset direction and the second preset direction can be as follows: Figure 5 The holes 16 shown are perpendicular to each other, but can also be at other angles, which is not limited here. When the multiple holes 16 are arranged in an array along the first and second preset directions that are perpendicular to each other, the processing efficiency of the holes 16 can be effectively improved. In other embodiments of this application, the multiple holes 16 can be arranged in a straight line, a curve, or other shapes, which is not limited here.

[0041] Furthermore, such as Figure 5As shown, in one embodiment of this application, the extension length Amm of the opening 16 in the first preset direction and / or the second preset direction satisfies 5mm ≤ Amm ≤ 30mm. It can be understood that the extension length Amm of the opening 16 can be the extension length of the opening 16 in the first preset direction or the extension length of the opening 16 in the second preset direction.

[0042] When the extension length Amm of the opening 16 is greater than 30mm, the extension length of a single opening 16 is too long, which has a significant impact on the local structural strength of the inner reinforcing part 13; when the extension length Amm of the opening 16 is less than 5mm, the extension length of a single opening 16 is too short, which has a poor weight reduction effect on the inner reinforcing part 13.

[0043] Therefore, when the extension length Amm of the opening 16 satisfies 5mm≤Amm≤30 mm in the first preset direction and / or the second preset direction, it can both ensure the local structural strength of the inner reinforcing part 13 corresponding to the opening 16 and effectively reduce the weight of the inner reinforcing part 13, thereby reducing the overall weight of the protective plate. In specific embodiments, the extension length Amm of the opening 16 can be selected from specific values ​​such as 5mm, 7mm, 9mm, 12mm, 16mm, 18mm, 22mm, 25mm, 27mm, 30mm, etc., and is not limited here.

[0044] Furthermore, such as Figure 5 As shown, in one embodiment of this application, the spacing Bmm between adjacent openings 16 in the first preset direction and / or the second preset direction satisfies 30 mm ≤ B mm ≤ 200 mm. When the spacing Bmm between adjacent openings 16 is greater than 200 mm, it can easily affect the weight reduction effect of the inner reinforcement 13 in terms of the density of the openings 16. When the spacing Bmm between adjacent openings 16 is less than 30 mm, the local structural strength of the inner reinforcement 13 corresponding to the opening 16 is low, which can easily affect the protective effect of the inner reinforcement 13.

[0045] Therefore, when the spacing Bmm between adjacent openings 16 satisfies 30 mm ≤ B mm ≤ 200 mm in the first preset direction and / or the second preset direction, the weight of the inner reinforcing part 13 can be effectively reduced, thereby reducing the overall weight of the protective plate, while ensuring the local structural strength of the inner reinforcing part 13 corresponding to the opening 16, thus guaranteeing the protective effect of the inner reinforcing part 13. In specific embodiments, the spacing Bmm between adjacent openings 16 can be selected from specific values ​​such as 30 mm, 40 mm, 60 mm, 90 mm, 130 mm, 150 mm, 170 mm, 180 mm, 190 mm, and 200 mm, and is not limited here.

[0046] Specifically, in one embodiment of this application, the shape of the opening 16 includes at least one of the following: circular, elliptical, triangular, quadrilateral, or polygonal. That is, as... Figure 5 As shown, the shape of the openings 16 can all be circular, or all be another shape, or be a combination of openings 16 with different shapes, and there are no restrictions here.

[0047] It is understood that the first reinforcing layer 11 and / or the second reinforcing layer 12 in the protection plate of this application embodiment can be as follows: Figure 5 As shown, it simultaneously has an inner reinforcing part 13, an outer filling part 14, and an inner filling part 15, and can also be as follows: Figure 3 The diagram shows only the inner reinforcing part 13 and the outer filling part 14, and is not limited to this.

[0048] In one embodiment of this application, the tensile strength of the inner reinforcing portion 13 of the first reinforcing layer 11 is R(1) MPa, where R(1) MPa satisfies 200 MPa ≤ R(1) MPa ≤ 2200 MPa. When the tensile strength R(1) MPa of the inner reinforcing portion 13 of the first reinforcing layer 11 satisfies 200 MPa ≤ R(1) MPa ≤ 2200 MPa, the structural strength of the inner reinforcing portion 13 of the first reinforcing layer 11 can be effectively guaranteed, thereby ensuring the impact resistance of the protective plate in this embodiment. It also ensures that the inner reinforcing portion 13 of the first reinforcing layer 11 has a certain deformation, thereby ensuring that the inner reinforcing portion 13 of the first reinforcing layer 11 has a certain puncture resistance, preventing damage to the inner reinforcing portion 13 of the first reinforcing layer 11 from sharp impacts, and thus ensuring the airtightness of the protective plate when applied to a battery pack. In a specific embodiment, the tensile strength R(1) MPa of the inner reinforcing part 13 of the first reinforcing layer 11 can be selected from specific values ​​such as 200MPa, 350MPa, 600MPa, 900MPa, 1200MPa, 1500MPa, 1700MPa, 1900MPa, 2000MPa, 220 MPa, etc., and is not limited here.

[0049] Similarly, in one embodiment of this application, the tensile strength of the inner reinforcing portion 13 of the second reinforcing layer 12 is R(2) MPa, where R(2) MPa satisfies 320 MPa ≤ R(1) MPa ≤ 3000 MPa, achieving a similar effect, which will not be elaborated further here. In specific embodiments, the tensile strength R(2) MPa of the inner reinforcing portion 13 of the second reinforcing layer 12 can be selected from specific values ​​such as 320 MPa, 500 MPa, 800 MPa, 1100 MPa, 1500 MPa, 1800 MPa, 2100 MPa, 2400 MPa, 2700 MPa, and 3000 MPa, and is not limited here.

[0050] In one embodiment of this application, the inner reinforcing portion 13 is made of at least one of deep-drawing cold-rolled steel, duplex steel, quenched and portioned steel, and hot-formed steel. When the inner reinforcing portion 13 is made of at least one of deep-drawing cold-rolled steel, duplex steel, quenched and portioned steel, the comprehensive requirements for the structural strength and puncture resistance of the inner reinforcing portion 13 can be effectively met, thereby effectively ensuring the protective capability of the protective plate in this embodiment of the application.

[0051] It is understood that when the protective plate in this embodiment of the application serves as the bottom protective plate of the battery pack, one of the first reinforcing layer 11 and the second reinforcing layer 12 is located on the side adjacent to the battery cell, and the other is located on the bottom side of the battery pack to directly face the impact; therefore, the structural strength and puncture resistance of the reinforcing layer located on the side adjacent to the battery cell are more important, and steel with a high elongation can be selected; the structural strength requirement of the reinforcing layer located on the bottom side of the battery pack is higher, therefore, steel with a high tensile strength can be selected.

[0052] The first reinforcing layer 11 is located on one side adjacent to the battery cell, and the second reinforcing layer 12 is located on the bottom side of the battery pack, designed to withstand impacts first. The inner reinforcing portion 13 of the first reinforcing layer 11 can be made of high-elongation steel such as deep-drawing cold-rolled steel, dual-phase steel, or quenched and distributed steel. The inner reinforcing portion 13 of the second reinforcing layer 12 can be made of high-tensile-strength steel such as dual-phase steel or hot-formed steel. The second reinforcing layer 12 can be configured as a strip or corrugated plate to enhance its structural strength. Besides steel, the first and second reinforcing layers 11 and 12 can also be made of materials with a certain degree of hardness, such as foam or plastic.

[0053] In one embodiment of this application, the thickness of the first reinforcing layer 11 is D(1) mm, where D(1) mm satisfies 0.6 mm ≤ D(1) mm ≤ 2 mm. When the thickness D(1) mm of the first reinforcing layer 11 is less than 0.6 mm, the structural strength of the first reinforcing layer 11 is poor, making it difficult to withstand impacts of large energy. When the thickness D(1) mm of the first reinforcing layer 11 is greater than 2 mm, the thickness of the first reinforcing layer 11 is too large, resulting in a relatively large overall weight, which may affect the overall quality of the protective plate in this embodiment. Therefore, when the thickness D(1) mm of the first reinforcing layer 11 satisfies 0.6 mm ≤ D(1) mm ≤ 2 mm, the structural strength of the first reinforcing layer 11 can be effectively guaranteed, thereby ensuring that the overall protective capability of the protective plate meets the requirements, while also effectively reducing the weight of the first reinforcing layer 11, thereby reducing the overall quality of the protective plate. In a specific embodiment, the thickness D(1) mm of the first reinforcing layer 11 can be selected from specific values ​​such as 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.3mm, 1.5mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc., and is not limited here.

[0054] Similarly, in one embodiment of this application, the thickness of the second reinforcing layer 12 is D(2) mm, where D(2) mm satisfies 0.3 mm ≤ D(2) mm ≤ 3 mm. The effect is the same as described above and will not be repeated here. When the thickness D(2) mm of the second reinforcing layer 12 is less than 0.3 mm, the structural strength of the second reinforcing layer 12 is poor and it is difficult to withstand large energy impacts. When the thickness D(2) mm of the second reinforcing layer 12 is greater than 3 mm, the thickness of the second reinforcing layer 12 is too large, and the overall weight is also relatively large, which can easily affect the overall quality of the protective plate in this embodiment of the application. Therefore, when the thickness D(2) mm of the second reinforcing layer 12 satisfies 0.3 mm ≤ D(2) mm ≤ 3 mm, the structural strength of the second reinforcing layer 12 can be effectively guaranteed, thereby ensuring that the overall protective capability of the protective plate meets the requirements, and the weight of the second reinforcing layer 12 can be effectively reduced, thereby reducing the overall quality of the protective plate.

[0055] In a specific embodiment, the thickness D(2) mm of the second reinforcing layer 12 can be selected from specific values ​​such as 0.3mm, 0.5mm, 0.8mm, 1.1mm, 1.4mm, 1.7mm, 2mm, 2.3mm, 2.6mm, 3mm, etc., and is not limited here.

[0056] In one embodiment of this application, the thickness of the intermediate composite layer 21 is D(3) mm, where D(3) mm satisfies 0.4 mm ≤ D(3) mm ≤ 5 mm. When the thickness D(3) mm of the intermediate composite layer 21 is less than 0.4 mm, the number and thickness of the continuous fibers 41 are low, which can easily affect the puncture resistance of the protective plate. When the thickness D(3) mm of the intermediate composite layer 21 is greater than 5 mm, the thickness of the intermediate composite layer 21 is too large, and the overall weight is also relatively large, which can easily affect the overall quality of the protective plate in this embodiment of the application. Therefore, when the thickness D(3) mm of the intermediate composite layer 21 satisfies 0.4 mm ≤ D(3) mm ≤ 5 mm, it can effectively ensure that the number and thickness of the continuous fibers 41 in the intermediate composite layer 21 meet the requirements, thereby ensuring that the puncture resistance of the protective plate meets the requirements, and can also effectively reduce the weight of the first reinforcing layer 11, thereby reducing the overall quality of the protective plate. In a specific embodiment, the thickness D(3) mm of the intermediate composite layer 21 can be selected from specific values ​​such as 0.4 mm, 0.7 mm, 1.2 mm, 1.8 mm, 2.3 mm, 2.9 mm, 3.5 mm, 4.1 mm, 4.6 mm, 5.0 mm, etc., and is not limited here.

[0057] It is understandable that when the first reinforcing layer 11 is directly exposed, problems such as rust and corrosion are likely to occur. Usually, the first reinforcing layer 11 needs to be electrophoretically sprayed, which is time-consuming, reduces the processing efficiency of the protective plate, and increases the processing cost of the protective plate.

[0058] Therefore, as Figure 6 As shown, in one embodiment of this application, the protective plate further includes a first composite layer 22; the first composite layer 22 is stacked on the first side of the first reinforcing layer 11 and fixedly connected to the first reinforcing layer 11. By adding the first composite layer 22 to the first side of the first reinforcing layer 11, the first composite layer 22 is bonded and fixed together with the first reinforcing layer 11, isolating the first reinforcing layer 11 from the outside world, thus avoiding problems such as rust and corrosion of the first reinforcing layer 11 when exposed, and eliminating the need for electrophoretic spraying treatment of the first reinforcing layer 11, which can effectively improve the processing efficiency of the protective plate and reduce the processing cost of the protective plate. It is understood that the first composite layer 22 can be made of thermoplastic fiber composite material. By adding the first composite layer 22 made of thermoplastic fiber composite material to the first side of the first reinforcing layer 11, the thermoplastic fiber composite material of the first composite layer 22 can be bonded and fixed together with the first reinforcing layer 11 after melting during the molding process of the protective plate.

[0059] Similarly, such as Figure 6As shown, in one embodiment of this application, the protective plate further includes a second composite layer 23. The second composite layer 23 is stacked on the second side of the second reinforcing layer 12 and is fixedly connected to the second reinforcing layer 12. The effect of the second composite layer 23 is the same as that of the first composite layer 22 described above, and will not be repeated here. It is understood that the protective plate of this application may have only one of the first composite layer 22 and the second composite layer 23, or it may include both the first composite layer 22 and the second composite layer 23, which is not limited here.

[0060] Specifically, in one embodiment of this application, the thickness of the first composite layer 22 is D(4) mm, where D(4) mm satisfies 0.4 mm ≤ D(4) mm ≤ 5 mm. When the thickness D(4) mm of the first composite layer 22 is less than 0.4 mm, the number and thickness of the continuous fibers 41 are low, which can easily affect the puncture resistance of the protective plate. When the thickness D(4) mm of the first composite layer 22 is greater than 5 mm, the thickness of the first composite layer 22 is too large, and the overall weight is also relatively large, which can easily affect the overall quality of the protective plate in this embodiment of the application. Therefore, when the thickness D(4) mm of the first composite layer 22 satisfies 0.4 mm ≤ D(4) mm ≤ 5 mm, it can effectively ensure that the number and thickness of the continuous fibers 41 in the first composite layer 22 meet the requirements, thereby ensuring that the puncture resistance of the protective plate meets the requirements, and can also effectively reduce the weight of the first reinforcing layer 11, thereby reducing the overall quality of the protective plate. In a specific embodiment, the thickness D(4) mm of the first composite layer 22 can be selected from specific values ​​such as 0.4 mm, 0.7 mm, 1.2 mm, 1.8 mm, 2.3 mm, 2.9 mm, 3.5 mm, 4.1 mm, 4.6 mm, 5.0 mm, etc., and is not limited here.

[0061] Similarly, in one embodiment of this application, the thickness of the second composite layer 23 is D(5) mm, where D(5) mm satisfies 0.4 mm ≤ D(5) mm ≤ 5 mm. The effect of the thickness of the second composite layer 23 is similar to that of the thickness of the first composite layer 22 described above, and will not be repeated here. In specific embodiments, the thickness D(5) mm of the second composite layer 23 can be selected from specific values ​​such as 0.4 mm, 0.7 mm, 1.2 mm, 1.8 mm, 2.3 mm, 2.9 mm, 3.5 mm, 4.1 mm, 4.6 mm, and 5.0 mm, and is not limited here.

[0062] Specifically, the thermoplastic fiber composite material in the protective plate of this application embodiment includes continuous fiber 41 and thermoplastic resin matrix. Continuous fiber 41 includes at least one of glass fiber, carbon fiber, and aramid fiber. The thermoplastic resin matrix includes at least one of polypropylene, polyamide, polyphenylene sulfide, and polyetheretherketone.

[0063] When the continuous fiber 41 of the thermoplastic fiber composite material includes at least one of glass fiber, carbon fiber, and aramid fiber, glass fiber, carbon fiber, and aramid fiber can provide high structural strength and high specific modulus, ensuring that the thermoplastic fiber composite material has good tensile, flexural, and impact properties. When the thermoplastic resin matrix of the thermoplastic fiber composite material includes at least one of polypropylene, polyamide, polyphenylene sulfide, and polyetheretherketone, the hot pressing speed of the thermoplastic fiber composite material can be effectively increased, thereby improving the processing efficiency of the protective plate.

[0064] Furthermore, in one embodiment of this application, at least one of the intermediate composite layer 21, the first composite layer 22, and the second composite layer 23 includes at least two layers of continuous fibers 41 stacked together with different fiber orientations. Since at least one of the intermediate composite layer 21, the first composite layer 22, and the second composite layer 23 includes at least two layers of continuous fibers 41 stacked together with different fiber orientations, the stacked continuous fibers 41 with different fiber orientations can ensure that the intermediate composite layer 21, the first composite layer 22, or the second composite layer 23 has good structural performance in different directions.

[0065] like Figure 7 As shown, in a specific embodiment, at least one of the intermediate composite layer 21, the first composite layer 22, and the second composite layer 23 may include four layers of continuous fibers 41 stacked together. The orientation of the upper and lower continuous fibers 41 is 0°, and the orientation of the middle two continuous fibers 41 is 90°. In this way, the resulting thermoplastic fiber composite material can ensure good structural performance in all directions.

[0066] like Figure 8 and Figure 9 As shown, in one embodiment of this application, the protective plate further includes a reinforcing coating 31, which is stacked on the second side of the protective plate. The reinforcing coating 31 improves the puncture resistance of the protective plate, and also has good wear resistance and corrosion resistance, thereby enhancing the protective effect and extending the service life of the protective plate. Specifically, the reinforcing coating 31 can be made of at least one of polyvinyl chloride and polyurea.

[0067] It is understood that when the protective plate in this embodiment serves as the bottom protective plate of the battery pack, the reinforcing coating 31 can be disposed on one side of the bottom of the battery pack to directly withstand external impacts. Specifically, as shown... Figure 8 As shown, in the case where the protective plate of this application embodiment has a second composite layer 23, the reinforcing coating 31 can be stacked on the second side of the second composite layer 23; as Figure 9As shown, in the case where the protective plate in this embodiment does not have the second composite layer 23, the reinforcing coating 31 can be stacked on the second side of the second reinforcing layer 12.

[0068] In one embodiment of this application, the thickness of the reinforcing coating 31 is D(6) mm, where D(6) mm satisfies 0.4 mm ≤ D(6) mm ≤ 5 mm. When the thickness D(6) mm of the reinforcing coating 31 is less than 0.4 mm, the thickness is too small, resulting in poor puncture resistance, abrasion resistance, and corrosion resistance. When the thickness D(6) mm of the reinforcing coating 31 is greater than 5 mm, the thickness is too large, leading to a significant overall weight and potentially affecting the overall quality of the protective plate in this embodiment. Therefore, ensuring that the thickness D(6) mm of the reinforcing coating 31 satisfies 0.4 mm ≤ D(6) mm ≤ 5 mm effectively guarantees that the puncture resistance, abrasion resistance, and corrosion resistance of the reinforcing coating 31 meet the requirements, while also effectively reducing the weight of the reinforcing coating 31, thereby reducing the overall quality of the protective plate. In a specific embodiment, the thickness D(6) mm of the reinforcing coating 31 can be selected from specific values ​​such as 0.4 mm, 0.7 mm, 1.2 mm, 1.8 mm, 2.3 mm, 2.9 mm, 3.5 mm, 4.1 mm, 4.6 mm, 5.0 mm, etc., and is not limited here.

[0069] It is understood that, in one embodiment of this application, an uneven reinforcing portion may be provided on the protective plate of this application embodiment to improve the structural strength of the protective plate, and the specific shape may be set as needed.

[0070] This application embodiment also provides a battery pack, the electrical device including the aforementioned protection plate. It is understood that the battery pack also includes a battery assembly, and the aforementioned protection plate can serve as a bottom protective plate for the battery pack. The bottom protective plate can be used to protect the bottom surface of the individual battery cells in the battery assembly. The protection plate can be part of the housing, and can be separately processed and then fixedly connected to the frame of the housing to form the housing of the battery pack.

[0071] According to actual measurements, the protective plate of this embodiment can effectively withstand the impact of a spherical or hemispherical impact head with a diameter of 30mm and a mass of 10kg at an impact energy of 1200J, and its strength meets the requirements. Furthermore, under high-energy impacts exceeding 700J, the protective plate of this embodiment is not prone to damage, effectively ensuring the airtightness of the battery pack after impact. When applied to a battery pack where the explosion-proof valve is located at the bottom of the battery cell, a cavity can be provided at the bottom of the battery pack to effectively protect the internal battery cells, reduce impact deformation, and also protect the explosion-proof valve at the bottom of the battery cell, preventing damage from external impacts.

[0072] This application also provides an electrical device that includes at least one of the aforementioned battery packs. It is understood that this electrical device can be any type of electrical device, such as an electric vehicle, an appliance with a battery pack, or an energy storage device, and is not limited thereto. It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this application will not further describe the various possible combinations.

[0073] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part does not imply the exclusion of other components or parts.

[0074] It should be understood that while terms such as "first" or "second" may be used in this application to describe various elements, these elements are not limited by these terms; these terms are merely used to distinguish one element from another. The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms "a," "the," and "the" as used in one or more embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0075] In this document, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, and not to define the absolute position of these related parts. Terms such as "equal" and "same" are not strict mathematical and / or geometric limitations, and also include errors that are understandable to those skilled in the art and permissible in manufacturing or use. Unless otherwise stated, numerical ranges in this document include not only the entire range within its two endpoints, but also several subranges contained therein.

[0076] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0077] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A protective plate, characterized in that, It includes a first reinforcing layer (11), an intermediate composite layer (21), and a second reinforcing layer (12) that are stacked and fixedly connected in sequence; the first reinforcing layer (11) is located on the first side of the intermediate composite layer (21), and the second reinforcing layer (12) is located on the second side of the intermediate composite layer (21); The first reinforcing layer (11) includes an inner reinforcing portion (13) and an outer filling portion (14) surrounding the outer side of the inner reinforcing portion (13), and / or the second reinforcing layer (12) includes an inner reinforcing portion (13) and an outer filling portion (14) surrounding the outer side of the inner reinforcing portion (13). The area enclosed by the outer edge of the inner reinforcing part (13) is S(11) mm. 2 The area of ​​the outer filling part (14) is S(12) mm. 2 S(11) / S(12) satisfies 0.3≤S(11) / S(12)≤1.

2. The protective plate according to claim 1, characterized in that, The inner reinforcing part (13) is rectangular in shape, and the outer filling part (14) is shaped like a square.

3. The protective plate according to claim 1, characterized in that, At least one opening (16) is provided on the inner reinforcing part (13); the opening (16) of the inner reinforcing part (13) is filled with an inner filling part (15).

4. The protective plate according to claim 3, characterized in that, The area of ​​the opening (16) is S(21) mm. 2 The area of ​​the inner reinforcing part (13) is S(22) mm. 2 S(21) / S(22) satisfies 0.01≤S(21) / S(22)≤0.

7.

5. The protective plate according to claim 3, characterized in that, The opening (16) is provided in multiple ways, and the multiple openings (16) are arranged in an array along a first preset direction and a second preset direction.

6. The protective plate according to claim 5, characterized in that, In the first preset direction and / or the second preset direction, the extension length Amm of the opening (16) satisfies 5mm≤Amm≤30mm.

7. The protective plate according to claim 5, characterized in that, In the first preset direction and / or the second preset direction, the spacing Bmm between adjacent openings (16) satisfies 30 mm ≤ B mm ≤ 200 mm.

8. The protective plate according to claim 3, characterized in that, The shape of the opening (16) includes at least one of the following: circular, elliptical, triangular, quadrilateral, or polygonal.

9. The protective plate according to any one of claims 1 to 8, characterized in that, The tensile strength of the inner reinforcing part (13) of the first reinforcing layer (11) is R(1) MPa, and R(1) MPa satisfies 200MPa≤R(1) MPa≤2200MPa; and / or, the tensile strength of the inner reinforcing part (13) of the second reinforcing layer (12) is R(2) MPa, and R(2) MPa satisfies 320 MPa≤R(1) MPa≤3000MPa.

10. The protective plate according to any one of claims 1 to 8, characterized in that, The thickness of the first reinforcing layer (11) is D(1) mm, and D(1) mm satisfies 0.6 mm ≤ D(1) mm ≤ 2 mm.

11. The protective plate according to any one of claims 1 to 8, characterized in that, The thickness of the second reinforcing layer (12) is D(2) mm, and D(2) mm satisfies 0.3 mm ≤ D(2) mm ≤ 3 mm.

12. The protective plate according to any one of claims 1 to 8, characterized in that, The second reinforcing layer (12) is a strip plate or a corrugated plate.

13. The protective plate according to any one of claims 1 to 8, characterized in that, The thickness of the intermediate composite layer (21) is D(3) mm, and D(3) mm satisfies 0.4 mm ≤ D(3) mm ≤ 5 mm.

14. The protective plate according to any one of claims 1 to 8, characterized in that, It also includes a first composite layer (22) and / or a second composite layer (23); The first composite layer (22) is stacked on the first side of the first reinforcing layer (11) and is fixedly connected to the first reinforcing layer (11); The second composite layer (23) is stacked on the second side of the second reinforcing layer (12) and is fixedly connected to the second reinforcing layer (12).

15. The protective plate according to claim 14, characterized in that, The thickness of the first composite layer (22) is D(4) mm, and D(4) mm satisfies 0.4 mm ≤ D(4) mm ≤ 5 mm; And / or, the thickness of the second composite layer (23) is D(5) mm, where D(5) mm satisfies 0.4 mm ≤ D(5) mm ≤ 5 mm.

16. The protective plate according to any one of claims 1 to 8, characterized in that, It also includes a reinforcing coating (31), which is stacked on the second side of the protective plate.

17. The protective plate according to claim 16, characterized in that, The thickness of the reinforcing coating (31) is D(6) mm, and D(6) mm satisfies 0.4 mm ≤ D(6) mm ≤ 5 mm.

18. A battery pack, characterized in that, Includes the protective plate according to any one of claims 1 to 17.

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