Power battery pack, box body thereof and vehicle

Abstract

The utility model relates to a power battery pack, a box body thereof and a vehicle, a power battery comprises a battery core and the box body for accommodating the battery core, the box body comprises a bottom plate, the bottom plate comprises a first sub-plate, a second sub-plate, an inclined rib and a protective layer, the first sub-plate and the second sub-plate are arranged at an interval, the inclined rib is arranged between the first sub-plate and the second sub-plate, and the protective layer is arranged between the first sub-plate and the second sub-plate. The battery core is arranged on the surface, far away from the second daughter board, of the first daughter board, and the protective layer is arranged on the surface, far away from the first daughter board, of the second daughter board. When the second sub-plate of the bottom plate of the box body is extruded, the inclined ribs are guided to deform by the action force of extrusion, and the action force can be quickly dispersed after the inclined ribs are subjected to local action force, so that the deformation of the first sub-plate is prevented, and the deformation of a battery cell arranged on the first sub-plate due to extrusion is further avoided; and the safety performance of the power battery pack box body is improved.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicle technology, and in particular to a power battery pack, a box thereof, and a vehicle. Background Art

[0002] As a core component of new energy vehicles, the power battery pack generally includes a battery case and a battery module arranged inside the battery case. The power battery pack is not only the power source of the vehicle, but has also gradually become one of the most important components in the vehicle chassis and power. The reliability of the power battery pack structure plays an important role in the safety of the battery cells integrated in the battery module and even the safety of the vehicle. With the large-scale promotion of electric vehicles and the increase in their market share, the safety issues caused by scratches on the bottom of electric vehicles have become particularly prominent. When the bottom of an electric vehicle is scratched or collided, the bottom plate of the battery case will be deformed due to the impact, which will then squeeze the battery module, easily causing the risk of damage to the battery module. Therefore, the existing technology usually sets a protective structure at the bottom of the battery case.

[0003] In addition, the battery module is composed of battery cells. In order to ensure the heat dissipation of the battery cells in the power battery pack and make the power battery pack have a long service life and excellent performance, a cooling plate is usually provided at the bottom of the battery cell for cooling the battery cell. Since the cooling plate is provided on the bottom plate of the battery case, the bottom plate is easily squeezed when subjected to external impact. Therefore, this is also the reason why a protective structure needs to be provided for the battery case of the power battery pack.

[0004] Existing protective measures for the underside of power battery packs primarily include adding aluminum profiles or using PVC-coated sheet metal underbody panels. While aluminum profiles offer excellent corrosion protection, they still pose a risk of cracking after impact, potentially failing to maintain the seal of the power battery pack. PVC-coated sheet metal underbody panels protect the power battery pack from damage under certain pressures and scrapes, but they can fail to maintain the seal of the battery pack if the aluminum profiles crack during scraping or support operations.

[0005] Furthermore, to ensure structural strength, the aforementioned protective structure often requires sufficient thickness in the height direction of the power battery pack, occupying Z-axis installation space and reducing the space utilization of the power battery pack. Furthermore, to achieve greater power, the space at the bottom of the power battery pack is often compressed, resulting in a lack of sufficient safety clearance in the vehicle. Utility Model Content

[0006] Based on this, it is necessary to provide a power battery pack, its box, and vehicle that can save installation space and improve safety performance.

[0007] A box for a power battery pack is used to accommodate battery cells. The box includes a bottom plate, which includes a first sub-plate, a second sub-plate, oblique ribs and a protective layer. The first sub-plate and the second sub-plate are arranged at intervals, the oblique ribs are arranged between the first sub-plate and the second sub-plate, and the two ends of the oblique ribs are respectively connected to the first sub-plate and the second sub-plate. The battery cell is arranged on the surface of the first sub-plate away from the second sub-plate, and the protective layer is arranged on the surface of the second sub-plate away from the first sub-plate.

[0008] In one embodiment, the first sub-board has a corresponding first surface and a second surface, the first surface is provided with an installation area and a non-installation area, and the installation area is used to install the battery cell;

[0009] The oblique rib has a first end and a second end, the first end is connected to a position on the second surface corresponding to the non-installation area, and the second end is connected to the second sub-board.

[0010] In one embodiment, the included angle between the oblique rib and the first sub-plate is 20 degrees to 70 degrees.

[0011] In one embodiment, the number of the oblique ribs is at least two, and the oblique ribs divide the spacing area between the first sub-board and the second sub-board into a plurality of cavities, and the cross-section of the cavities is trapezoidal.

[0012] In one embodiment, the thickness of the oblique rib is 1.5 mm to 3.5 mm; and / or the distance between the first sub-plate and the second sub-plate is 1 mm to 3 mm.

[0013] In one embodiment, the protective layer is a polyurea coating, and the thickness of the polyurea coating is 1 mm to 4 mm;

[0014] Alternatively, the protective layer is made of metal, and has a thickness of 0.5 mm to 2 mm.

[0015] In one embodiment, the protective layer includes a first layer and a second layer, and the second sub-board, the first layer and the second layer are sequentially arranged along the height direction of the box;

[0016] Alternatively, the protective layer includes a first layer and a second layer, the number of the first layer is two, one layer is located between the second sub-board and the second layer, and the other layer is located on the surface of the second layer away from the second sub-board.

[0017] In one embodiment, the first layer is a polyurea coating, and the total thickness of the polyurea coating is 1 mm to 4 mm;

[0018] The second layer is made of metal, and has a thickness of 0.5 mm to 2 mm.

[0019] The present application also provides a power battery pack, comprising a battery cell and a box as described above, wherein the battery cell is installed in the box.

[0020] The present application also provides a vehicle comprising the power battery pack as described above.

[0021] Compared to the prior art, the power battery pack case provided by this application features diagonal ribs disposed between the first and second sub-plates. When the second sub-plate on the bottom plate of the case is squeezed, the squeezing force causes the diagonal ribs to deform first. After being subjected to localized force, the ribs quickly disperse the force, preventing deformation of the first sub-plate and, consequently, deformation of the battery cells mounted on the first sub-plate. Furthermore, this application improves the safety of the power battery pack case simply by providing diagonal ribs within the bottom plate. Compared to prior art methods that employ multiple protective structures to enhance the safety of the battery pack case, this reduces the thickness of the battery pack case, thereby saving installation space on the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following is a brief introduction to the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A three-dimensional diagram of a box in one embodiment of the present application;

[0024] Figure 2 is a cross-sectional view of a bottom plate in one embodiment of the present application;

[0025] Figure 3 is a cross-sectional exploded view of a bottom plate in one embodiment of the present application;

[0026] Figure 4 This is a top view of the base plate in one embodiment of the present application.

[0027] Figure numerals: 1, bottom plate assembly; 2, side frame; 10, bottom plate; 110, first sub-plate; 111, first surface; 1111, installation area; 1112, non-installation area; 112, second surface; 120, oblique rib; 121, first end; 122, second end; 123, cavity; 130, second sub-plate; 140, protective layer; 141, first layer; 142, second layer; 20, battery cell. DETAILED DESCRIPTION

[0028] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0029] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0031] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0033] The present application provides a power battery pack, a housing thereof, and a vehicle, wherein the power battery includes a battery cell and a housing for accommodating the battery cell, and the power battery pack is installed in the vehicle.

[0034] See Figures 1 to 3 The box of the power battery pack provided in the present application includes a bottom plate 10, which includes a first sub-plate 110, a second sub-plate 130, an oblique rib 120 and a protective layer 140. The first sub-plate 110 and the second sub-plate 130 are arranged at intervals, the oblique rib 120 is arranged between the first sub-plate 110 and the second sub-plate 130, and the two ends of the oblique rib 120 respectively connect the first sub-plate 110 and the second sub-plate 130. The battery core 20 is arranged on the surface of the first sub-plate 110 away from the second sub-plate 130, and the protective layer 140 is arranged on the surface of the second sub-plate 130 away from the first sub-plate 110.

[0035] The power battery pack case provided in this application features oblique ribs 120 disposed between the first sub-plate 110 and the second sub-plate 130. When the second sub-plate 130 of the case bottom plate 10 is squeezed, the squeezing force causes the oblique ribs 120 to deform first. After being subjected to localized force, the oblique ribs 120 quickly disperse the force, preventing deformation of the first sub-plate 110 and thereby protecting the battery cells mounted on the first sub-plate 110 from squeezing and deformation, thereby enhancing the safety of the power battery pack case. Furthermore, this application improves the safety of the power battery pack case simply by disposing the oblique ribs 120 within the bottom plate 10. Compared to prior art methods that employ multiple protective structures to enhance the safety of the power battery pack case, this reduces the thickness of the power battery pack case, thereby saving installation space on the vehicle.

[0036] It will be appreciated that, in one embodiment, the base plate 10 is manufactured using a tailor-welded aluminum profile process, with the first sub-plate 110, the second sub-plate 130, and the diagonal ribs 120 welded together as a single unit. This improves the structural stability and strength of the base plate 10. Furthermore, there is no limit on the number of diagonal ribs 120; the number can be adjusted based on factors such as the size of the vehicle using the power battery pack and the number of battery cells 20.

[0037] In one embodiment, the first sub-board 110 has a first surface 111 and a second surface 112 corresponding to each other. The first surface 111 is provided with a mounting area 1111 and a non-mounting area 1112. Figure 4As shown, the installation area 1111 is used to install the battery cell 20, and the second surface 112 corresponding to the non-installation area 1112 is used to connect the oblique rib 120, and the oblique rib 120 has a first end 121 and a second end 122, the first end 121 is connected to the second surface 112, and the first end 121 is located on the second surface 112 corresponding to the non-installation area 1112, and the second end 122 is connected to the second sub-board 130. In this way, when the bottom plate 10 is locally subjected to a force from the second sub-plate 130 toward the first sub-plate 110, the force will be transmitted to the first sub-plate 110 along the oblique rib 120. Since the first end is connected to the position corresponding to the non-installation area on the second surface, that is, the first end 121 of the oblique rib 120 and the battery cell 20 are staggered in the height direction of the box, the oblique rib 120 can guide the force to the non-installation area 1112 of the first surface 111, thereby avoiding deformation of the first sub-plate 110 and avoiding the force transmitted to the first sub-plate 110 through the oblique rib 120 from directly acting on the battery cell 20, thereby protecting the battery cell 20 from being squeezed and deformed, and reducing the risk of thermal runaway of the battery cell 20.

[0038] It is understood that each mounting area 1111 can accommodate one battery cell 20 to protect the battery cell 20. Furthermore, partitions can be added between adjacent battery cells 20 to prevent overheating of the battery cells 20. However, multiple rows and / or columns of mounting areas 1111 can be provided on each first surface 111 as needed.

[0039] In one embodiment, the angle between the oblique ribs 120 and the first sub-panel 110 is between 20 and 70 degrees, which ensures excellent energy absorption and structural stability of the base plate 10. Illustratively, the angle between the oblique ribs 120 and the first sub-panel 110 can be 20°, 30°, 40°, 50°, 60°, 70°, or a range consisting of any two of these values. Furthermore, there are at least two oblique ribs 120, and the angles between the two oblique ribs 120 and the first sub-panel 110 can be the same or different, without limitation.

[0040] In one embodiment, the thickness of the oblique ribs 120 is 1.5 mm to 3.5 mm, which ensures that the oblique ribs 120 have sufficient structural strength and provides sufficient rigidity to the base plate 10. Illustratively, the thickness of the oblique ribs 120 is 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, or a range consisting of any two of these values.

[0041] In one embodiment, the distance between the first sub-plate 110 and the second sub-plate 130 is 1 mm to 3 mm. This provides sufficient space for the deformation of the diagonal ribs 120 while reducing the height of the battery box, thereby reducing the installation space of the power battery pack on the vehicle. The distance between the first sub-plate 110 and the second sub-plate 130 is 1 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, or a range consisting of any two of these values.

[0042] In one embodiment, there are at least two oblique ribs 120, which divide the space between the first sub-plate 110 and the second sub-plate 130 into a plurality of cavities 123. The cross-section of each cavity 123 is trapezoidal. This reduces the weight of the base plate 10, reduces material usage, and lowers production costs. Furthermore, the cross-section of each cavity 123 can be either an equilateral trapezoid or an unequal-sided trapezoid. Using an equilateral trapezoidal cross-section for each cavity 123 simplifies the production process.

[0043] In one embodiment, the protective layer 140 is a polyurea coating. It is understandable that sheet metal is often used in the prior art to protect the bottom of the power battery pack case, and the density of the sheet metal is more than 6.5 times that of the polyurea coating. In this way, the power battery pack can be lightweight; and the polyurea coating has good impact resistance and sealing performance. In this way, when the bottom of the second sub-plate 130 is bumped or squeezed, the polyurea coating can effectively absorb the impact energy. Even if the bottom plate 10 of the power battery pack case is damaged, the polyurea coating still ensures the sealing performance of the power battery pack.

[0044] Furthermore, the thickness of the polyurea coating is 1 mm to 4 mm. If the thickness of the polyurea coating is too great, the amount of polyurea coating material used will increase, which will not only increase the cost but also increase the weight of the bottom plate 10 of the box body, which is not conducive to lightweighting. If the thickness is too small, the second sub-plate 130 of the bottom plate 10 of the box body will be easily exposed, thereby reducing the mechanical strength and wear resistance of the bottom of the power battery pack, affecting the safety and reliability of the power battery pack. Illustratively, the thickness of the polyurea coating is 1 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, or a range consisting of any two of these values. In this embodiment, the thickness of the polyurea coating can be controlled by those skilled in the art by adjusting process parameters such as coating concentration, coating viscosity, coating method, and coating speed.

[0045] In one embodiment, the protective layer 140 is made of metal. It is understood that metal sheets possess a certain structural strength and are also capable of protecting the second sub-panel 130 of the enclosure. Furthermore, the thickness of the protective layer 140 is between 0.5 mm and 2 mm. This ensures that the protective layer 140 is neither too thin to protect the bottom plate 10 nor too thick to increase the overall height of the enclosure. Illustratively, the metal can be any grade of aluminum or stainless steel alloy.

[0046] In one embodiment, the protective layer 140 includes a first layer 141 and a second layer 142, and the second sub-plate 130, the first layer 141 and the second layer 142 are arranged in sequence along the height direction of the box. Furthermore, one of the first layer 141 and the second layer 142 is a coating with flexibility and impact resistance, and the other is a metal plate layer. By laminating the coating and the metal plate layer on the bottom plate 10 of the box body of the power battery pack, the bottom plate 10 of the power battery pack box body is protected. This embodiment uses two different materials to form the protective layer 140. In this way, the performance of different materials can be complementary, thereby ensuring the safety of the bottom of the power battery pack under dynamic ball hitting conditions and static ball hitting conditions. The coating can be an epoxy resin coating, a polyurethane coating, an acrylic resin coating, a silicone modified polyurethane coating, a thermoplastic polyurethane (TPU) coating, a polyurea coating, etc., and it only needs to have flexibility and impact resistance, and is not limited here. Similarly, there is no limitation on the material of the metal plate layer.

[0047] Furthermore, when the first layer 141 is a coating, the coating can be sprayed onto the surface of the second sub-panel 130 away from the first sub-panel 110, or onto the surface of the metal layer near the second sub-panel 130. Alternatively, the coating can be sprayed onto both the surface of the second sub-panel 130 away from the first sub-panel 110 and the surface of the metal layer near the second sub-panel 130, without limitation. When the coating is sprayed onto the metal layer, the metal layer can be secured to the second sub-panel 130 using adhesive, mechanical fastening, or a combination of adhesive and mechanical fastening.

[0048] In another embodiment, the protective layer 140 includes a first layer 141 and a second layer 142. The first layer 141 is two layers, one located between the second sub-plate 130 and the protective layer 140, and the other located on the surface of the protective layer 140 away from the second sub-plate 130. Furthermore, the first layer 141 is a flexible and impact-resistant coating, and the second layer 142 is a metal layer. Because the metal layer has a certain structural strength, applying the coating to both surfaces of the metal layer improves the elongation at break of the metal layer, thereby ensuring the safety performance of the power battery pack body bottom plate 10.

[0049] Furthermore, the first layer 141 is a polyurea coating, and the second layer 142 is made of metal. By laminating the polyurea coating and the metal plate layer to the bottom plate 10 of the power battery pack case, the bottom plate 10 of the power battery pack case is protected. Because the polyurea coating has sufficient impact resistance, flexibility and sealing properties, when used in conjunction with the metal plate layer, the protective layer 140 including the polyurea coating and the metal plate layer can have both structural strength and resistance to dynamic impact; in this way, when the bottom of the power battery pack case is bumped, the protective layer 140 can ensure the structural safety of the case, thereby ensuring that the battery cell 20 is not subject to safety risks caused by extrusion and deformation. In addition, this embodiment uses two different materials to generate the protective layer 140, which can achieve complementary performance of different materials, thereby ensuring the safety of the bottom of the power battery pack under dynamic ball hitting conditions and static ball hitting conditions. Furthermore, the thickness of the second layer 142 is 0.5 mm to 2 mm.

[0050] Furthermore, when there is only one layer of polyurea coating, the polyurea coating can be sprayed on the surface of the second sub-plate 130 away from the first sub-plate 110, or can be sprayed on the surface of the metal plate layer close to the second sub-plate 130;

[0051] When the polyurea coating has two layers, one layer can be located between the second sub-plate 130 and the second layer 142, and the other layer can be located on the surface of the second layer 142 away from the second sub-plate 130. Furthermore, the polyurea coating located between the second sub-plate 130 and the second layer 142 can be sprayed on the second sub-plate 130 or on the surface of the second layer 142 close to the second sub-plate 130.

[0052] When the polyurea coating has three layers, the surface of the second sub-plate 130 close to the second layer 142 and both surfaces of the second layer 142 may be sprayed with the polyurea coating;

[0053] Furthermore, the total thickness of the polyurea coating is 1 mm to 4 mm; thus, if the thickness of the polyurea coating is too large, the amount of polyurea coating material used will increase, which will not only increase the cost but also increase the weight of the box bottom plate 10, which is not conducive to lightweighting. If the thickness is too small, the second sub-plate 130 of the box bottom plate 10 will be easily exposed, thereby reducing the mechanical strength and wear resistance of the bottom of the power battery pack, affecting the safety and reliability of the power battery pack.

[0054] Understandably, see Figure 1 In one embodiment, a plurality of bottom plates 10 are sequentially spliced ​​along the length direction of the box to form a bottom plate assembly 1 of the box. In this way, the size of the bottom plate 10 can be flexibly adjusted to facilitate processing.

[0055] It is understood that the box body further includes a side frame 2, which is connected to the bottom plate assembly 1 to form a receiving cavity for accommodating the battery cell 2020. In this way, the risk of thermal runaway of the battery cell 2020 can be reduced.

[0056] The present application also provides a power battery pack, comprising a battery cell 20 and a housing as described in any of the above embodiments, wherein the battery cell 20 is mounted in the housing. By adding diagonal ribs and a protective layer to the bottom plate of the housing, the present application can prevent the battery cell 20 from being deformed by compression during scraping or supporting operations while also meeting the airtightness requirements of the power battery pack, thereby improving the reliability of the bottom protection of the power battery pack and extending the service life of the power battery pack.

[0057] This application also provides a vehicle, including a power battery pack as described in any of the above embodiments, mounted on the vehicle. In some embodiments, the power battery pack is mounted on the bottom of the vehicle. When the power battery pack is installed, the bottom plate of the power battery pack housing faces the ground.

[0058] In some embodiments, the vehicle is a battery-swappable vehicle. It is understood that a battery-swappable vehicle generally refers to any vehicle that supports battery swapping. In some embodiments, the vehicle has a structure that allows the replacement of the power battery pack.

[0059] In some embodiments, the vehicle includes, but is not limited to, an electric vehicle, a hybrid electric vehicle, and a plug-in hybrid electric vehicle.

[0060] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. A box for a power battery pack, used to accommodate battery cells, characterized in that: The box body includes a bottom plate, and the bottom plate includes a first sub-plate, a second sub-plate, an oblique rib and a protective layer. The first sub-plate and the second sub-plate are spaced apart, the oblique rib is provided between the first sub-plate and the second sub-plate, and the two ends of the oblique rib are respectively connected to the first sub-plate and the second sub-plate. The battery core is provided on the surface of the first sub-plate away from the second sub-plate, and the protective layer is provided on the surface of the second sub-plate away from the first sub-plate.

2. The box of the power battery pack according to claim 1, characterized in that: The first sub-board has a corresponding first surface and a second surface, the first surface is provided with an installation area and a non-installation area, the installation area is used to install the battery cell; The oblique rib has a first end and a second end, the first end is connected to a position on the second surface corresponding to the non-installation area, and the second end is connected to the second sub-board.

3. The box of the power battery pack according to claim 1, characterized in that: The included angle between the oblique rib and the first sub-plate is 20 degrees to 70 degrees.

4. The box of the power battery pack according to claim 2, characterized in that: The number of the oblique ribs is at least two, and the oblique ribs divide the interval area between the first sub-board and the second sub-board into a plurality of cavities, and the cross section of the cavity is trapezoidal.

5. The box of the power battery pack according to claim 1, characterized in that: The thickness of the oblique ribs is 1.5 mm to 3.5 mm; and / or the distance between the first sub-plate and the second sub-plate is 1 mm to 3 mm.

6. The box of the power battery pack according to any one of claims 1 to 5, characterized in that: The protective layer is a polyurea coating, and the thickness of the polyurea coating is 1 mm to 4 mm; Alternatively, the protective layer is made of metal, and has a thickness of 0.5 mm to 2 mm.

7. The box of the power battery pack according to any one of claims 1 to 5, characterized in that: The protective layer includes a first layer and a second layer, and the second sub-board, the first layer and the second layer are arranged in sequence along the height direction of the box; Alternatively, the protective layer includes a first layer and a second layer, the number of the first layer is two, one layer is located between the second sub-board and the second layer, and the other layer is located on the surface of the second layer away from the second sub-board.

8. The box of the power battery pack according to claim 7, characterized in that: The first layer is a polyurea coating, and the total thickness of the polyurea coating is 1 mm to 4 mm; The second layer is made of metal, and has a thickness of 0.5 mm to 2 mm.

9. A power battery pack, characterized in that: The invention comprises a battery core and a box body according to any one of claims 1 to 8, wherein the battery core is installed in the box body.

10. A vehicle, characterized in that: Comprising the power battery pack as claimed in claim 9.

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