Composite bottom protection plate, battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a composite bottom protection plate, a battery and electric equipment. The composite bottom protection plate comprises a first plate, a second plate and a metal plate which are sequentially stacked, and a first containing cavity is defined by the upper surfaces of the first plate and the second plate. A cavity is formed in the metal plate, and the first containing cavity is filled with the metal plate. Or the composite bottom protection plate further comprises a third plate and a honeycomb plate, a second containing cavity is defined by the lower surface of the second plate and the third plate, the first containing cavity is filled with one of the metal plate and the honeycomb plate, and the second containing cavity is filled with the other one of the metal plate and the honeycomb plate. The battery and the electric equipment comprise the composite bottom protection plate, and the metal plate improves the structural strength of the composite bottom protection plate, so that the extrusion resistance of the composite bottom protection plate is improved. Meanwhile, the cavity of the metal plate or the honeycomb plate has a better buffering effect, so that the deformation of the battery pack is avoided, and the protection on the battery pack and the safety of the battery are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a composite bottom guard plate, a battery and electrical equipment. Background Art

[0002] As the most important structural support of the battery pack, the battery bottom guard plate has a significant impact on the safety, lightweight and corrosion resistance of the battery system. The battery bottom guard plate in the prior art is mainly made of steel guard plates or composite steel guard plates, which have excellent processing and welding properties. When the battery is installed on the chassis of a vehicle (such as an electric car), the battery is easily affected by bottom scraping or bottom support conditions when the vehicle is driving on actual road conditions, and the steel guard plate or composite steel guard plate can protect the battery.

[0003] However, steel guard plates or composite steel guard plates are heavy and have poor rigidity. They are easily squeezed and deformed when scraping or supporting the bottom, causing damage to the battery pack or even causing a fire, reducing the safety of the battery. Utility Model Content

[0004] The utility model aims to provide a composite bottom guard plate, a battery and an electrical device, so as to improve the structural strength of the composite bottom guard plate, avoid the composite bottom guard plate from being squeezed and deformed when the battery scrapes or drags the bottom, and improve the safety of the battery.

[0005] To achieve this purpose, the technical solution adopted by the utility model is:

[0006] A composite bottom guard plate, comprising a stacked first plate, a second plate and a metal plate, wherein the first plate and the upper surface of the second plate enclose a first accommodating cavity;

[0007] The metal plate has a cavity therein, and the first accommodating cavity is filled and installed with the metal plate; or, the composite bottom guard plate also includes a third plate and a honeycomb plate, the lower surface of the second plate and the third plate form a second accommodating cavity, one of the metal plate and the honeycomb plate is filled and installed in the first accommodating cavity, and the other of the metal plate and the honeycomb plate is filled and installed in the second accommodating cavity.

[0008] As a preferred solution, the first plate, the second plate and the metal plate are bonded together or composited into one by a hot pressing process;

[0009] Alternatively, the first plate, the second plate, the third plate, the metal plate and the honeycomb plate are bonded together or composited into one through a hot pressing process.

[0010] As a preferred solution, when the composite bottom guard plate does not include the third plate and the honeycomb plate, the metal plate is an aluminum profile plate.

[0011] As a preferred solution, the aluminum profile plate is extruded in one piece to form at least one cavity penetrating along the length direction or the width direction in the aluminum profile plate;

[0012] Alternatively, the metal plate includes a plurality of the aluminum profile plates, and the plurality of the aluminum profile plates are welded together to enclose at least one of the cavities.

[0013] As a preferred solution, the thickness of the aluminum profile plate is 8 mm to 16 mm, and the wall thickness of the aluminum profile plate is 1.5 mm to 4 mm.

[0014] As a preferred solution, the honeycomb panel is made of one of polypropylene, polyethylene, polycarbonate, polyphenylene ether or polystyrene.

[0015] As a preferred solution, the thickness of the honeycomb panel is 5 mm to 10 mm.

[0016] As a preferred embodiment, when the composite bottom guard plate includes the third plate and the honeycomb plate, the metal plate is a solid steel plate or a solid aluminum plate.

[0017] As a preferred solution, the thickness of the metal plate is 0.6 mm to 1.5 mm.

[0018] As a preferred solution, when the metal plate does not include the third plate and the honeycomb plate, a first limiting groove is provided on the upper surface of the second plate, and the first plate is attached to the circumferential edge of the upper surface of the second plate, and the first limiting groove and the first accommodating cavity are enclosed;

[0019] When the composite bottom guard plate also includes the third plate and the honeycomb plate, a second limiting groove is correspondingly provided on the lower surface of the second plate, and the third plate is attached to the circumferential edge of the lower surface of the second plate and encloses the second accommodating cavity with the second limiting groove.

[0020] As a preferred solution, when the composite bottom guard plate does not include the third plate and the honeycomb plate, the upper surface of the second plate is provided with two first limiting grooves spaced apart along the Y direction or the upper surface of the second plate is provided with four first limiting grooves arrayed along the X direction and the Y direction;

[0021] When the composite bottom guard plate also includes the third plate and the honeycomb plate, the lower surface of the second plate is further provided with two second limiting grooves spaced apart along the Y direction; the third plate includes two split plates, and the two split plates are respectively arranged with the corresponding second limiting grooves to form the second accommodating cavity; or the lower surface of the second plate is provided with four second limiting grooves arranged in an array along the X direction and the Y direction; the third plate includes four split plates, and the four split plates are respectively arranged with the corresponding second limiting grooves to form the second accommodating cavity.

[0022] As a preferred embodiment, the first limiting groove has two first side surfaces arranged opposite to each other along the X direction and two second side surfaces arranged opposite to each other along the Y direction, and the spacing between the first side surface and the outer side surface of the adjacent second plate along the X direction is 20 mm to 300 mm; the spacing between the second side surface and the outer side surface of the adjacent second plate along the Y direction is 20 mm to 100 mm; and the spacing between two adjacent second side surfaces of two first limiting grooves spaced apart along the Y direction is 20 mm to 50 mm.

[0023] As a preferred solution, when the composite bottom guard plate does not include the third plate and the honeycomb plate, the second plate is coaxially provided with a second hole, and the first plate is coaxially provided with a third hole, and the fastener can be sequentially passed through the second hole and the third hole, and the first plate and the second plate are both locked to the bottom of the battery pack;

[0024] When the composite bottom guard plate also includes the third plate and the honeycomb plate, the third plate is also provided with a first hole, and the fastener can be sequentially passed through the first hole, the second hole and the third hole to lock the third plate, the second plate and the first plate to the bottom of the battery pack.

[0025] As a preferred solution, the first plate can be bonded to the bottom of the battery pack.

[0026] As a preferred solution, when the composite bottom guard plate does not include the third plate and the honeycomb plate, the thickness of the second plate is greater than the thickness of the first plate; the thickness of the first plate is 0.4 mm to 1 mm, and the thickness of the second plate is 0.6 mm to 1.5 mm;

[0027] Alternatively, when the composite bottom guard plate includes the third plate and the honeycomb plate, the thickness of the third plate is greater than the thickness of the first plate and the second plate; the thickness of the first plate and the second plate are both 0.4mm~1mm, and the thickness of the third plate is 0.6mm~1.5mm.

[0028] As a preferred solution, the material of the first plate, the second plate and the third plate is one of glass fiber, carbon fiber, boron fiber, ultra-high molecular weight polyethylene fiber, polypropylene, polyethylene, polycarbonate, polyphenylene ether and polystyrene.

[0029] As a preferred embodiment, when the material of the first plate, the second plate and the third plate is one of the glass fiber, the carbon fiber, the boron fiber and the ultra-high molecular weight polyethylene fiber, the fiber includes a warp fiber bundle and a weft fiber bundle, and the warp fiber bundle and the weft fiber bundle are cross-staggered.

[0030] A battery comprises a battery pack and the above-mentioned composite bottom guard plate, wherein the first plate of the composite bottom guard plate is installed at the bottom of the battery pack.

[0031] The electric device comprises an electric main body and the above-mentioned battery, wherein the battery supplies power to the electric main body.

[0032] The beneficial effects of the utility model are:

[0033] The composite bottom guard plate proposed in the utility model, when the composite bottom guard plate includes five layers of plates, namely, a first plate, a second plate, a third plate, a metal plate and a honeycomb plate, is formed into a five-layer plate structure by filling and installing one of the metal plate and the honeycomb plate in the first accommodating cavity and the other in the second accommodating cavity. The metal plate improves the structural strength of the composite bottom guard plate, thereby improving the anti-extrusion ability of the composite bottom guard plate when the battery scrapes or supports the bottom. At the same time, the honeycomb plate has a good buffering effect and can form a buffer space inside the composite bottom guard plate to absorb the extrusion energy and collision energy when the battery scrapes or supports the bottom, thereby reducing the deformation of the composite bottom guard plate, avoiding deformation of the battery pack, and improving the protection of the battery pack. When the composite bottom guard plate includes a first plate, a second plate and a metal plate, the composite bottom guard plate forms a three-layer plate structure, and a buffer space is formed between the first plate and the second plate, so that the metal plate absorbs the extrusion energy and collision energy when the battery scrapes or bottoms out, reducing the deformation of the composite bottom guard plate, achieving a good buffering effect, avoiding deformation of the battery pack, and improving the protection of the battery pack. The battery and electrical equipment proposed in the utility model include the above-mentioned composite bottom guard plate, which improves the structural strength of the composite bottom guard plate, thereby improving the anti-extrusion ability of the composite bottom guard plate when the battery scrapes or bottoms out. At the same time, a buffer space is formed inside the composite bottom guard plate to absorb the extrusion energy and collision energy when the battery scrapes or bottoms out, reducing the deformation of the composite bottom guard plate, avoiding deformation of the battery pack, and improving the protection of the battery pack and the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the structural decomposition of the composite bottom guard plate provided in the first embodiment of the utility model;

[0035] Figure 2 It is a partial longitudinal cross-sectional view of the composite bottom guard plate provided in the first embodiment of the utility model;

[0036] Figure 3 yes Figure 1 A partial enlarged view of the middle A;

[0037] Figure 4 yes Figure 1 A partial enlarged view of point B in the middle;

[0038] Figure 5 is a top view of the second plate provided in the first embodiment of the utility model;

[0039] Figure 6 This is a schematic diagram of the structural decomposition of the composite bottom guard plate provided in the second embodiment of the present utility model;

[0040] Figure 7 It is a partial longitudinal cross-sectional view of the composite bottom guard plate provided in the second embodiment of the present utility model;

[0041] Figure 8 yes Figure 6 A partial enlarged view of point C in the middle;

[0042] Fig. 9 yes Figure 6 A partial enlarged view of point D in the middle.

[0043] The names and numbers of the components in the figure are as follows:

[0044] 1. First plate; 10. First accommodating cavity; 11. Third hole; 2. Second plate; 21. First limiting groove; 22. Second hole; 3. Third plate; 30. Second accommodating cavity; 31. Split plate; 4. Metal plate; 41. Cavity; 5. Honeycomb plate. DETAILED DESCRIPTION

[0045] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0046] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0049] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0050] Embodiment 1

[0051] This embodiment proposes a battery, which includes a battery pack and a composite bottom guard plate, and the composite bottom guard plate is installed at the bottom of the battery pack to protect the battery pack. The battery of this embodiment can be installed on the chassis of a new energy vehicle as a power battery. Of course, the battery can also be used in other electrical equipment, which is not specifically limited here.

[0052] The main materials used for existing bottom guard plates are steel guard plates or composite steel guard plates. When the vehicle is driving on actual road conditions, the battery is easily affected by scraping or supporting the bottom. Since the steel guard plates or composite steel guard plates are heavy and have poor rigidity, they are easily squeezed and deformed when scraping or supporting the bottom, causing damage to the battery pack or even causing a fire, reducing the safety of the battery.

[0053] To solve the above problems, Figure 1 and Figure 2 As shown, this embodiment also proposes a composite bottom guard plate, which includes a stacked first plate 1, a second plate 2, a third plate 3, a metal plate 4 and a honeycomb plate 5. The upper surfaces of the first plate 1 and the second plate 2 form a first accommodating cavity 10, and the lower surfaces of the third plate 3 and the second plate 2 form a second accommodating cavity 30. One of the metal plate 4 and the honeycomb plate 5 is filled and installed in the first accommodating cavity 10, and the other of the metal plate 4 and the honeycomb plate 5 is filled and installed in the second accommodating cavity 30. By filling and installing one of the metal plate 4 and the honeycomb plate 5 in the first accommodating cavity 10 and the other in the second accommodating cavity 30, the composite bottom guard plate forms a five-layer plate structure. The metal plate 4 improves the structural strength of the composite bottom guard plate, thereby improving the anti-extrusion ability of the composite bottom guard plate when the battery is scraped or supported. At the same time, the honeycomb panel 5 has a good buffering effect and can form a buffer space inside the composite bottom guard plate to absorb the extrusion energy and collision energy when the battery scrapes or supports the bottom, reduce the deformation of the composite bottom guard plate, avoid deformation of the battery pack, and improve the protection of the battery pack.

[0054] like Figure 1 As shown, the metal plate 4 of this embodiment is filled and installed in the first accommodating cavity 10, which is closer to the bottom of the battery pack. The honeycomb panel 5 is filled and installed in the second accommodating cavity 30 and is located below the metal plate 4. In other embodiments, the installation positions of the metal plate 4 and the honeycomb panel 5 can also be interchanged, that is, the honeycomb panel 5 is filled and installed in the first accommodating cavity 10, which is closer to the bottom of the battery pack. The metal plate 4 is filled and installed in the second accommodating cavity 30 and is located below the honeycomb panel 5.

[0055] Specifically, the first plate 1, the second plate 2, the third plate 3, the metal plate 4 and the honeycomb plate 5 of this embodiment are combined into one by a hot pressing process. The structural strength of the composite bottom guard plate is improved. At the same time, the hot pressing process improves the production efficiency of the composite bottom guard plate. In other embodiments, the first plate 1, the second plate 2, the third plate 3, the metal plate 4 and the honeycomb plate 5 are bonded and connected to improve the structural strength of the composite bottom guard plate. At the same time, the bonding assembly method is simple and easy, which reduces the cost of the composite bottom guard plate and improves the production efficiency.

[0056] like Figure 1 and Figure 2As shown, the upper surface of the second plate 2 is provided with a first limiting groove 21, and the lower surface of the second plate 2 is also correspondingly provided with a second limiting groove (not shown in the figure). The first plate 1 is attached to the circumferential edge of the upper surface of the second plate 2, and is surrounded by the first limiting groove 21 to form a first accommodating cavity 10, and the third plate 3 is attached to the circumferential edge of the lower surface of the second plate 2, and is surrounded by the second limiting groove to form a second accommodating cavity 30. The first limiting groove 21 is filled with a metal plate 4 and the second limiting groove is filled with a honeycomb plate 5, so as to limit and fix the metal plate 4 and the honeycomb plate 5 respectively, so as to achieve stable assembly of the metal plate 4 and the honeycomb plate 5. When the battery is scraped or supported, the third plate 3 is subjected to extrusion impact, the honeycomb plate 5 is deformed and can absorb most of the extrusion energy and collision energy, reducing the deformation of the composite bottom guard plate, and the metal plate 4 can improve the structural strength of the composite bottom guard plate, so that the first plate 1 closer to the battery pack does not deform or only slightly deforms, greatly improving the safety of the battery pack.

[0057] like Figure 3 and Figure 4 As shown, the third plate 3 is provided with a first hole (not shown in the figure), the second plate 2 is coaxially provided with a second hole 22 correspondingly, and the first plate 1 is coaxially provided with a third hole 11 correspondingly, and the fasteners can be sequentially penetrated through the first hole, the second hole 22 and the third hole 11 to lock the third plate 3, the second plate 2 and the first plate 1 to the bottom of the battery pack. The fasteners of this embodiment can be bolts or pins, etc., so that the first plate 1, the second plate 2 and the third plate 3 are fixedly assembled with the battery pack by bolt connection or riveting, thereby improving the connection strength and stability of the composite bottom guard plate and the battery pack. In other embodiments, the first plate 1 can also be bonded to the bottom of the battery pack, and the bonding assembly method is simple and easy, which reduces costs and improves production efficiency.

[0058] It should be noted that the middle beam of the battery pack includes an X-direction beam and a Y-direction beam arranged in a cross shape, and the fixed positions of the X-direction beam and the Y-direction beam can be moved along the X direction or the Y direction according to the arrangement position of the battery cells. Figure 5As shown, the upper surface of the second plate 2 of this embodiment is provided with four first limiting grooves 21 arranged in an array along the X direction and the Y direction, and the lower surface of the second plate 2 is provided with four second limiting grooves arranged in an array along the X direction and the Y direction. The third plate 3 includes four split plates 31, and the four split plates 31 are respectively surrounded by the corresponding second limiting grooves to form a second accommodating cavity 30. The four split plates 31 are surrounded by a cross-shaped groove (i.e., the installation area of ​​the middle beam) adapted to the middle beam, so as to facilitate the assembly of the second plate 2 and the middle beam. There are four honeycomb panels 5, and the four honeycomb panels 5 are respectively installed in the corresponding second limiting grooves. In other embodiments, if the middle beam of the battery pack cancels the Y-direction cross beam, the upper surface of the second plate 2 is provided with two first limiting grooves 21 spaced apart along the Y direction, and the lower surface of the second plate 2 is provided with two second limiting grooves spaced apart along the Y direction. The third plate 3 includes two split plates 31, and the two split plates 31 are respectively surrounded by the corresponding second limiting grooves to form a second accommodating cavity 30. A straight groove (ie, the installation area of ​​the middle beam) adapted to the middle beam is formed between the two split plates 31 to facilitate the assembly of the second plate 2 and the middle beam. There are two honeycomb plates 5, which are respectively installed in the corresponding second limiting grooves.

[0059] like Figure 5As shown, the first limiting groove 21 has two first side surfaces arranged oppositely in the X direction and two second side surfaces arranged oppositely in the Y direction, and the spacing d2 between the first side surface and the outer side surface of the adjacent second plate 2 in the X direction is 20mm to 300mm. The spacing d1 between the second side surface and the outer side surface of the adjacent second plate 2 in the Y direction is 20mm to 100mm. The spacing d3 between the two adjacent second side surfaces of the two first limiting grooves 21 spaced apart in the Y direction is 20mm to 50mm. Specifically, d1 can be 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm or 100mm, etc. d2 can be 20mm, 50mm, 100mm, 150mm, 200mm, 250mm or 300mm, etc. d3 can be 20mm, 30mm, 40mm or 50mm, etc. By setting the size of d1, d2 and d3, the first limit groove 21 and the second limit groove have sufficient area to increase the use area of ​​the honeycomb panel 5 and the metal plate 4, and increase the area of ​​the buffer space of the composite bottom guard plate while ensuring the structural strength of the composite bottom guard plate, so that the honeycomb panel 5 can absorb as much extrusion energy and collision energy as possible when the battery scrapes or supports the bottom, and reduce the deformation of the composite bottom guard plate. If d1, d2 and d3 are too small, the difficulty of assembling the first plate 1, the second plate 2 and the third plate 3 and the difficulty of assembling the composite bottom guard plate and the battery pack will increase, and the amount of metal plate 4 used will increase, and the weight of the composite bottom guard plate will increase. If d1, d2 and d3 are too large, the amount of honeycomb panel 5 used will be reduced, and the area of ​​the buffer space of the composite bottom guard plate will be reduced, which is not conducive to reducing the deformation of the composite bottom guard plate.

[0060] It should be noted that the material of the honeycomb panel 5 is one of polypropylene, polyethylene, polycarbonate, polyphenylene oxide or polystyrene. The honeycomb panel 5 prepared by the above materials has a high structural strength, avoids breakage after being squeezed, and has a good buffering effect. At the same time, it is convenient for the processing and manufacturing of the honeycomb panel 5, improves the manufacturing efficiency of the honeycomb panel 5, and reduces the production cost. Specifically, the honeycomb panel 5 includes a skin and a honeycomb core, and a surface of the skin is covered with a plurality of honeycomb cores to improve the buffering effect of the honeycomb panel 5. The honeycomb core can be polygonal or circular, etc., and the specific structure and processing process of the honeycomb panel 5 will not be repeated. In other embodiments, the honeycomb panel 5 can also be made of other materials, as long as it has a good buffering effect.

[0061] Specifically, the thickness of the honeycomb panel 5 is 5 mm to 10 mm. The thickness of the honeycomb panel 5 can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm, etc. The thickness of the honeycomb panel 5 is set to the above value to ensure that the honeycomb panel 5 has sufficient structural strength, while ensuring that it is light in weight and occupies a small volume, thereby reducing the total weight of the composite bottom guard plate. When the thickness of the honeycomb panel 5 is too small, the structural strength of the honeycomb panel 5 is low, the buffering effect is poor, and it is difficult to meet the use requirements of the composite bottom guard plate. When the thickness of the honeycomb panel 5 is too large, the weight of the honeycomb panel 5 is heavy, which makes the total weight and occupied volume of the composite bottom guard plate larger.

[0062] The metal plate 4 of this embodiment is a solid steel plate or a solid aluminum plate. When the metal plate 4 is a solid steel plate, a galvanized steel plate or a tinned steel plate is required to improve the anti-corrosion performance of the steel plate. Of course, the surface of the solid steel plate can also be treated with an anti-corrosion process by electroplating or powder spraying to ensure the anti-corrosion performance of the solid steel plate. When the metal plate 4 is a solid aluminum plate, an aluminum profile plate can be used. The aluminum profile plate is lighter in weight and has a better anti-corrosion effect, which reduces the weight of the composite bottom guard plate and has a certain buffering effect.

[0063] Specifically, the thickness of the metal plate 4 is 0.6mm to 1.5mm. The thickness of the metal plate 4 of this embodiment can be 0.6mm, 0.8mm, 1mm, 1.2mm or 1.5mm, etc. Setting the thickness of the metal plate 4 to the above-mentioned value can ensure that the metal plate 4 has sufficient structural strength while ensuring that the weight is light, thereby reducing the total weight of the composite bottom guard plate. When the thickness of the metal plate 4 is too small, the structural strength of the metal plate 4 is low, and it is difficult to meet the use requirements of the composite bottom guard plate. When the thickness of the metal plate 4 is too large, the total weight and occupied volume of the composite bottom guard plate are both large, thereby increasing the total volume of the battery.

[0064] When the battery is scraped and supported, the third plate 3 is squeezed and collided the most severely. Therefore, the thickness of the third plate 3 is greater than that of the first plate 1 and the second plate 2, so that the structural strength of the third plate 3 is higher, and the third plate 3 is prevented from being seriously damaged, thereby improving the safety of the battery. Specifically, the thickness of the first plate 1 and the second plate 2 are both 0.4mm to 1mm, and the thickness of the third plate 3 is 0.6mm to 1.5mm. The thickness of the first plate 1 and the second plate 2 of this embodiment is equal, and can be 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, etc. The thickness of the third plate 3 can be 0.6mm, 0.8mm, 1mm, 1.2mm or 1.5mm, etc. The thickness of the first plate 1, the second plate 2 and the third plate 3 is set to the above values ​​to ensure that the first plate 1, the second plate 2 and the third plate 3 have sufficient structural strength, while ensuring that the weight is light, and reducing the total weight of the composite bottom guard plate. When the thickness of the first plate 1, the second plate 2 and the third plate 3 is too small, the structural strength of the composite bottom guard plate is low and it is difficult to meet the use requirements. When the thickness of the first plate 1, the second plate 2 and the third plate 3 is too large, the total weight and occupied volume of the composite bottom guard plate are large.

[0065] The material of the first plate 1, the second plate 2 and the third plate 3 of the present embodiment is one of glass fiber, carbon fiber, boron fiber, ultra-high molecular weight polyethylene fiber, polypropylene, polyethylene, polycarbonate, polyphenylene ether and polystyrene. The first plate 1, the second plate 2 and the third plate 3 composited by the above materials improve the overall structural strength of the composite bottom guard plate.

[0066] Furthermore, when the material of the first plate 1, the second plate 2 and the third plate 3 is one of glass fiber, carbon fiber, boron fiber and ultra-high molecular weight polyethylene fiber, the fiber includes a warp fiber bundle and a weft fiber bundle, and the warp fiber bundle and the weft fiber bundle are arranged crosswise. The crosswise arrangement of the warp fiber bundle and the weft fiber bundle improves the structural strength of the fiber, so that the overall strength of the first plate 1, the second plate 2 and the third plate 3 formed by the above-mentioned fiber composite is high, and the deformation of the composite bottom guard plate when scraping and supporting the bottom is reduced.

[0067] This embodiment also proposes an electrical device including an electrical user and the above-mentioned battery. The first plate 1 of the composite bottom guard plate is installed at the bottom of the battery pack, and the battery supplies power to the electrical user. The electrical user may be a new energy vehicle. The composite bottom guard plate forms a five-layer plate structure, and the metal plate 4 improves the structural strength of the composite bottom guard plate, thereby improving the anti-extrusion ability of the composite bottom guard plate when the battery scrapes or bottoms out. At the same time, the honeycomb plate 5 has a good buffering effect and can form a buffer space inside the composite bottom guard plate to absorb the extrusion energy and collision energy when the battery scrapes or bottoms out, reduce the deformation of the composite bottom guard plate, avoid deformation of the battery pack, and improve the protection of the battery pack and the safety of the battery.

[0068] Embodiment 2

[0069] like Figure 6 As shown, this embodiment proposes a composite bottom guard plate, which has a structure basically the same as that of the composite bottom guard plate in the first embodiment, and the main difference is that the composite bottom guard plate in this embodiment has only a three-layer structure, and the composite bottom guard plate only includes a stacked first plate 1, a second plate 2 and a metal plate 4, and the upper surfaces of the first plate 1 and the second plate 2 form a first accommodating cavity 10. The metal plate 4 has a cavity 41, and the first accommodating cavity 10 is filled and installed with the metal plate 4. It should be noted that the first plate 1 and the second plate 2 are both composite resin plates, which improve the structural strength of the composite bottom guard plate, thereby improving the anti-extrusion ability of the composite bottom guard plate when the battery is scraped or supported. At the same time, by arranging a metal plate 4 with a cavity 41 between the first plate 1 and the second plate 2, the composite bottom guard plate forms a three-layer plate structure, and a buffer space is formed between the first plate 1 and the second plate 2, so that the metal plate 4 absorbs the extrusion energy and collision energy when the battery is scraped or supported, thereby reducing the deformation of the composite bottom guard plate, achieving a better buffering effect, avoiding deformation of the battery pack, and improving the protection of the battery pack.

[0070] Specifically, the first plate 1, the second plate 2 and the metal plate 4 of this embodiment are combined into one by a hot pressing process, thereby improving the structural strength of the composite bottom guard plate. At the same time, the hot pressing process improves the production efficiency of the composite bottom guard plate. In other embodiments, the first plate 1, the second plate 2 and the metal plate 4 can also be bonded together to improve the structural strength of the composite bottom guard plate. At the same time, the bonding assembly method is simple and easy, which reduces the cost of the composite bottom guard plate and improves the production efficiency.

[0071] like Figure 6 and Figure 7As shown, the upper surface of the second plate 2 is provided with a first limiting groove 21, and the first plate 1 is attached to the circumferential edge of the second plate 2, and is surrounded by the first limiting groove 21 to form a first accommodating cavity 10. The first limiting groove 21 is filled with a metal plate 4 to achieve the limiting fixation of the metal plate 4. The inner side surface of the second plate 2 (the side facing the first plate 1) has a first limiting groove 21, and the outer side surface of the second plate 2 forms a boss structure accordingly. When the battery is scraped or supported, the second plate 2 is subjected to extrusion impact, the metal plate 4 is deformed and can absorb most of the extrusion energy and collision energy, reducing the deformation of the composite bottom guard plate, while the first plate 1 closer to the battery pack does not deform or only slightly deforms, greatly protecting the safety of the battery pack. It should be noted that since the circumferential edge of the second plate 2 is superimposed on the first plate 1, there is no need to additionally install a reinforced resin frame between the circumferential edges of the second plate 2 and the first plate 1, which simplifies the structure of the composite bottom guard plate and reduces the cost.

[0072] like Figure 8 and Fig. 9 As shown, the second plate 2 is provided with a second hole 22, and the first plate 1 is correspondingly provided with a third hole 11 coaxially. The fasteners can be sequentially inserted into the second hole 22 and the third hole 11, and the second plate 2 and the first plate 1 are locked to the bottom of the battery pack. The fasteners of this embodiment can be bolts or pins, etc., so that the second plate 2 and the first plate 1 are fixedly assembled with the battery pack by bolt connection or riveting, thereby improving the connection strength and stability between the composite bottom guard plate and the battery pack. In other embodiments, the first plate 1 can also be bonded to the bottom of the battery pack. The bonding assembly method is simple and easy, which reduces the cost of the battery and improves production efficiency.

[0073] The middle beam of the battery pack in this embodiment includes an X-direction beam and a Y-direction beam arranged in a cross shape, and the fixed positions of the X-direction beam and the Y-direction beam can be moved along the X direction or the Y direction according to the arrangement position of the battery cells. The inner side surface of the second plate 2 in this embodiment has four first limiting grooves 21 arranged in an array along the X direction and the Y direction, so that the outer side surface of the second plate 2 has four bosses arranged in an array along the X direction and the Y direction, and the four bosses are surrounded by a cross-shaped groove adapted to the middle beam, so as to facilitate the assembly of the composite bottom guard plate and the middle beam. There are four metal plates 4, and the four metal plates 4 are respectively installed in the corresponding first limiting grooves 21. In other embodiments, if the middle beam of the battery pack cancels the Y-direction beam, the inner side surface of the second plate 2 has two first limiting grooves 21 arranged at intervals along the Y direction. There are two metal plates 4, and the two metal plates 4 are respectively installed in the corresponding first limiting grooves 21.

[0074] In this embodiment, the metal plate 4 is an aluminum profile plate, which has a high structural strength, avoids breakage after being squeezed, and has a good buffering effect. Compared with steel plates, aluminum profile plates are lighter, which reduces the weight of the composite bottom guard plate, and the aluminum profile plate has a better anti-corrosion effect. In addition, aluminum profile plates can be purchased directly and used without design and processing, and the cost is low. In other embodiments, the metal plate 4 can also be made of other materials, and it only needs to have a cavity 41 to have a good buffering effect.

[0075] Furthermore, the aluminum profile plate is extruded in one piece to form at least one cavity 41 that is arranged to penetrate in the length direction or the width direction in the aluminum profile plate. The production efficiency and structural strength of the aluminum profile plate are improved by the one-piece extrusion molding method. The longitudinal section of the cavity 41 of the present embodiment is rectangular. It is understandable that the longitudinal section shape of the cavity 41 can also be circular, triangular or other polygonal, which is not specifically limited here. In other embodiments, the metal plate 4 can also be formed by welding a plurality of aluminum profile plates. Specifically, the metal plate 4 includes a plurality of aluminum profile plates, and the plurality of aluminum profile plates are welded together to enclose at least one cavity 41.

[0076] Specifically, the thickness of the aluminum profile plate is 8mm to 16mm, and the wall thickness of the aluminum profile plate is 1.5mm to 4mm. The thickness of the aluminum profile plate can be 8mm, 10mm, 12mm, 14mm or 16mm, etc. The wall thickness of the aluminum profile plate can be 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm or 4mm, etc. The thickness and wall thickness of the aluminum profile plate are set to the above values ​​to ensure that the aluminum profile plate has sufficient structural strength, while ensuring that the weight is light and the volume occupied is small, thereby reducing the total weight of the composite bottom guard plate. When the thickness and wall thickness of the aluminum profile plate are too small, the structural strength of the aluminum profile plate is low, the buffering effect is poor, and it is difficult to meet the use requirements of the composite bottom guard plate. When the thickness and wall thickness of the aluminum profile plate are too large, the weight of the aluminum profile plate is heavy, which makes the total weight and volume occupied by the composite bottom guard plate larger.

[0077] When the battery is scraped and supported, the second plate 2 is squeezed and collided the most severely. Therefore, the thickness of the first plate 1 is less than that of the second plate 2, so that the structural strength of the second plate 2 is higher, and the second plate 2 is prevented from being seriously damaged, thereby improving the safety of the battery. Specifically, the thickness of the first plate 1 is 0.4mm to 1mm, and the thickness of the second plate 2 is 0.6mm to 1.5mm. The thickness of the first plate 1 of this embodiment can be 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, etc. The thickness of the second plate 2 can be 0.6mm, 0.8mm, 1mm, 1.2mm or 1.5mm, etc. The thickness of the first plate 1 and the second plate 2 is set to the above values ​​to ensure that the first plate 1 and the second plate 2 have sufficient structural strength, while ensuring that the weight is light, and reducing the total weight of the composite bottom guard plate. When the thickness of the first plate 1 and the second plate 2 is too small, the structural strength of the first plate 1 and the second plate 2 is low, and it is difficult to meet the use requirements of the composite bottom guard plate. When the thickness of the first plate 1 and the second plate 2 is too large, the total weight and the occupied volume of the composite bottom guard plate are both large.

[0078] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. Composite bottom guard plate, characterized in that: It comprises a first plate (1), a second plate (2) and a metal plate (4) which are stacked, wherein the upper surfaces of the first plate (1) and the second plate (2) form a first accommodating cavity (10); The metal plate (4) has a cavity (41) therein, and the first accommodating cavity (10) is filled and installed with the metal plate (4); or, the composite bottom guard plate further includes a third plate (3) and a honeycomb plate (5), the lower surface of the second plate (2) and the third plate (3) enclose a second accommodating cavity (30), one of the metal plate (4) and the honeycomb plate (5) is filled and installed in the first accommodating cavity (10), and the other of the metal plate (4) and the honeycomb plate (5) is filled and installed in the second accommodating cavity (30).

2. The composite bottom guard plate according to claim 1, characterized in that: The first plate (1), the second plate (2) and the metal plate (4) are bonded together or composited into one by a hot pressing process; Alternatively, the first plate (1), the second plate (2), the third plate (3), the metal plate (4) and the honeycomb plate (5) are bonded together or composited into one body through a hot pressing process.

3. The composite bottom guard plate according to claim 1, characterized in that: When the composite bottom guard plate does not include the third plate (3) and the honeycomb plate (5), the metal plate (4) is an aluminum profile plate.

4. The composite bottom guard plate according to claim 3, characterized in that: The aluminum profile plate is integrally extruded to form at least one cavity (41) penetrating along the length direction or the width direction in the aluminum profile plate; Alternatively, the metal plate (4) comprises a plurality of the aluminum profile plates, and the plurality of the aluminum profile plates are welded together to enclose at least one cavity (41).

5. The composite bottom guard plate according to claim 3, characterized in that: The thickness of the aluminum profile plate is 8 mm to 16 mm, and the wall thickness of the aluminum profile plate is 1.5 mm to 4 mm.

6. The composite bottom guard plate according to claim 1, characterized in that: The material of the honeycomb panel (5) is one of polypropylene, polyethylene, polycarbonate, polyphenylene ether or polystyrene.

7. The composite bottom guard plate according to claim 1, characterized in that: The thickness of the honeycomb panel (5) is 5 mm to 10 mm.

8. The composite bottom guard plate according to claim 1, characterized in that: When the composite bottom guard plate includes the third plate (3) and the honeycomb plate (5), the metal plate (4) is a solid steel plate or a solid aluminum plate.

9. The composite bottom guard plate according to claim 8, characterized in that: The thickness of the metal plate (4) is 0.6 mm to 1.5 mm.

10. The composite underbody panel according to any one of claims 1 to 9, characterized in that: When the metal plate (4) does not include the third plate (3) and the honeycomb plate (5), the upper surface of the second plate (2) is provided with a first limiting groove (21), the first plate (1) is attached to the circumferential edge of the upper surface of the second plate (2), and the first plate (1) and the first limiting groove (21) are enclosed to form the first accommodating cavity (10); When the composite bottom guard plate further comprises the third plate (3) and the honeycomb plate (5), a second limiting groove is correspondingly provided on the lower surface of the second plate (2), and the third plate (3) is fitted to the circumferential edge of the lower surface of the second plate (2) and is enclosed with the second limiting groove to form the second accommodating cavity (30).

11. The composite bottom guard plate according to claim 10, characterized in that: When the composite bottom guard plate does not include the third plate (3) and the honeycomb plate (5), the upper surface of the second plate (2) is provided with two first limit grooves (21) arranged at intervals along the Y direction, or the upper surface of the second plate (2) is provided with four first limit grooves (21) arranged in an array along the X direction and the Y direction; When the composite bottom guard plate further comprises the third plate (3) and the honeycomb plate (5), the lower surface of the second plate (2) is further provided with two second limiting grooves spaced apart along the Y direction; the third plate (3) comprises two split plates (31), and the two split plates (31) are respectively arranged with the corresponding second limiting grooves to form the second accommodating cavity (30); or the lower surface of the second plate (2) is provided with four second limiting grooves arranged in an array along the X direction and the Y direction; the third plate (3) comprises four split plates (31), and the four split plates (31) are respectively arranged with the corresponding second limiting grooves to form the second accommodating cavity (30).

12. The composite bottom guard plate according to claim 11, characterized in that: The first limiting groove (21) has two first side surfaces arranged opposite to each other along the X direction and two second side surfaces arranged opposite to each other along the Y direction, the spacing between the first side surface and the outer side surface of the adjacent second plate (2) along the X direction is 20 mm to 300 mm; the spacing between the second side surface and the outer side surface of the adjacent second plate (2) along the Y direction is 20 mm to 100 mm; and the spacing between two adjacent second side surfaces of two first limiting grooves (21) arranged at intervals along the Y direction is 20 mm to 50 mm.

13. The composite underbody panel according to any one of claims 1 to 9, characterized in that: When the composite bottom guard plate does not include the third plate (3) and the honeycomb plate (5), the second plate (2) is coaxially provided with a second hole (22), and the first plate (1) is coaxially provided with a third hole (11), and a fastener can be sequentially inserted into the second hole (22) and the third hole (11), and the first plate (1) and the second plate (2) are both locked to the bottom of the battery pack; When the composite bottom guard plate further includes the third plate (3) and the honeycomb plate (5), the third plate (3) is further provided with a first hole, and the fastener can be sequentially inserted into the first hole, the second hole (22) and the third hole (11) to lock the third plate (3), the second plate (2) and the first plate (1) to the bottom of the battery pack.

14. The composite underbody panel according to any one of claims 1 to 9, characterized in that: The first plate (1) can be bonded and connected to the bottom of the battery pack.

15. The composite underbody panel according to any one of claims 1 to 9, characterized in that: When the composite bottom guard plate does not include the third plate (3) and the honeycomb plate (5), the thickness of the second plate (2) is greater than the thickness of the first plate (1); the thickness of the first plate (1) is 0.4 mm to 1 mm, and the thickness of the second plate (2) is 0.6 mm to 1.5 mm; Alternatively, when the composite bottom guard plate comprises the third plate (3) and the honeycomb plate (5), the thickness of the third plate (3) is greater than the thickness of the first plate (1) and the second plate (2); the thickness of the first plate (1) and the second plate (2) are both 0.4 mm to 1 mm, and the thickness of the third plate (3) is 0.6 mm to 1.5 mm.

16. The composite underbody panel according to any one of claims 1 to 9, characterized in that: The material of the first plate (1), the second plate (2) and the third plate (3) is one of glass fiber, carbon fiber, boron fiber, ultra-high molecular weight polyethylene fiber, polypropylene, polyethylene, polycarbonate, polyphenylene ether and polystyrene.

17. The composite underbody panel according to claim 16, characterized in that: When the material of the first plate (1), the second plate (2) and the third plate (3) is one of the glass fiber, the carbon fiber, the boron fiber and the ultra-high molecular weight polyethylene fiber, the fiber comprises a warp fiber bundle and a weft fiber bundle, and the warp fiber bundle and the weft fiber bundle are cross-staggered.

18. A battery, characterized in that It comprises a battery pack and a composite bottom guard plate according to any one of claims 1 to 17, wherein a first plate (1) of the composite bottom guard plate is mounted on the bottom of the battery pack.

19. Electrical equipment, characterized in that: The utility model comprises an electric power consumption entity and the battery as claimed in claim 18, wherein the battery supplies power to the electric power consumption entity.

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