Ground protection plate arrangement and battery pack

Abstract

Ground protection plate arrangement, characterized in that it comprises: a floor protection plate; a reinforcing plate located on one side of the base plate and arranged at a distance from the base plate, wherein the reinforcing plate is provided with a plurality of projecting sections that project towards the base plate, wherein one side of each projecting section facing the base plate is connected to the base plate, wherein a plurality of mounting spaces are defined between the reinforcing plate and the base plate, and wherein the mounting spaces and the projecting sections are arranged offset; and a buffer element that is provided in each of the numerous assembly spaces.

Description

REFERENCE TO A RELATED REGISTRATION

[0001] This application claims priority over the Chinese patent application filed with the Chinese Patent Office on June 19, 2023, under application number 202321569730.4, entitled "Ground protection plate arrangement and battery pack". The entire content of that application is incorporated into the present application by reference. AREA OF TECHNOLOGY

[0002] The present application relates to the technical field of batteries, in particular a ground protection plate arrangement and a battery pack. STATE OF THE ART

[0003] In related technologies, a ground protection plate assembly is formed by extruding and welding aluminum plates or by punching steel plates, resulting in a ground protection plate assembly with low structural strength that does not meet the requirements of the ball impact test from below. SUMMARY OF THE USAGE SAMPLE

[0004] The present application aims to solve at least one of the technical problems that exist in related technologies. Accordingly, one objective of the present application is to provide a ground protection plate arrangement with high structural strength and the ability to reduce impact force, thus ensuring good protective effect.

[0005] Another objective of the present application is to provide a battery pack that has the ground protection plate arrangement described above.

[0006] According to one embodiment of the present application, a floor protection plate arrangement is provided, comprising: a floor protection plate; a reinforcement plate located on one side of the floor protection plate and arranged at a distance from the floor protection plate, wherein the reinforcement plate is provided with a plurality of projecting sections projecting towards the floor protection plate, wherein one side of each projecting section facing the floor protection plate is connected to the floor protection plate, wherein a plurality of mounting spaces are defined between the reinforcement plate and the floor protection plate, and wherein the mounting spaces and the projecting sections are arranged offset; and a buffer element provided in each of the plurality of mounting spaces.

[0007] In the ground protection plate arrangement according to the embodiment of the present application, the plurality of mounting spaces between the reinforcement plate and the ground protection plate are defined by connecting the plurality of projecting sections of the reinforcement plate to the ground protection plate. The mounting spaces and projecting sections are arranged in an offset pattern, and each of the plurality of mounting spaces is equipped with the buffer element. This ensures a reliable connection between the ground protection plate and the reinforcement plate, which contributes to improving the strength of the connection between the ground protection plate and the reinforcement plate. In this way, the structural strength of the ground protection plate arrangement is improved.Furthermore, the multitude of buffer elements can also absorb the impact force acting on the ground protection plate arrangement, which helps to reduce the impact force and ensure that the ground protection plate arrangement provides good protection and meets the requirements of the ball impact test from below.

[0008] Furthermore, the ground protection plate arrangement according to the embodiment of the present application can have the following additional technical features: According to some embodiments of the present application, the base plate and the projecting sections are welded together. According to some embodiments of the present application, a maintenance opening is provided on the base plate and the reinforcement plate is configured to recess the maintenance opening.

[0009] According to some embodiments of the present application, the floor protection plate arrangement further comprises: a cover plate located on one side of the floor protection plate facing away from the reinforcement plate, and the cover plate is removably arranged over the maintenance opening.

[0010] According to one embodiment of the present application, a battery pack is provided comprising: a base plate arrangement according to the embodiment of the present application; and a cell arrangement located on a side of the reinforcement plate that points away from the base plate.

[0011] In the battery pack according to the embodiment of the present application, the plurality of mounting spaces between the reinforcement plate and the base plate are defined by connecting the plurality of projecting sections of the reinforcement plate to the base plate. The mounting spaces and projecting sections are arranged in an offset pattern, and each of the plurality of mounting spaces is equipped with the buffer element. This ensures a reliable connection between the base plate and the reinforcement plate, which contributes to improving the strength of the connection between the base plate and the reinforcement plate. In this way, the structural strength of the base plate assembly is improved.Furthermore, the multitude of buffer elements can also absorb the impact force acting on the ground protection plate arrangement, which helps to reduce the impact force and ensure that the ground protection plate arrangement provides good protection and meets the requirements of the ball impact test from below.

[0012] According to some embodiments of the present application, an explosion-proof valve is provided on one side of the cell arrangement that faces the base protection plate arrangement, and a protective plate is provided between the cell arrangement and the reinforcement plate, wherein the protective plate and the explosion-proof valve face each other.

[0013] According to some embodiments of the present application, a groove is provided on one side of the projecting section, pointing away from the bottom protective plate, wherein the protective plate is located in the groove and is arranged at a distance from a bottom of the groove to form a drain channel, wherein a drain opening is provided on a side wall of the groove on both sides of the protective plate, and wherein the drain opening is configured to communicate with the drain channel.

[0014] According to some embodiments of the present application, a plurality of drain openings are arranged at intervals from one another along the longitudinal direction of the projecting section, and each of the plurality of drain openings is configured to be connected to the drain channel.

[0015] According to some embodiments of the present application, the protective plate is a mica plate.

[0016] According to some embodiments of the present application, a protective layer is provided at least on one side of the reinforcement plate facing the cell arrangement and on one side of the cell arrangement facing the reinforcement plate.

[0017] Further aspects and advantages of the present application are partly set out in the following description and partly are obvious from the description or can be experienced through practical implementation of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or further aspects and advantages of the present application become apparent from the description of the embodiments and are easier to understand when considered in conjunction with the accompanying drawings, wherein: Fig. 1 an exploded view of the ground protection plate arrangement according to an embodiment of the present application; Fig. 2 a structural schematic representation of the ground protection plate arrangement according to an embodiment of the present application; Fig. 3 is an enlarged structural schematic representation of area “A”, which is in Fig. 2 is circled; Fig. 4 is an enlarged structural schematic representation of area “B”, which is in Fig. 2 is circled; Reference symbol:

[0019] = 100. Ground protection plate arrangement; 10. Ground protection plate; 11. Maintenance opening; 20. Reinforcement plate; 21. Projecting section; 22. Groove; 211. Drainage opening; 221. Drainage channel; 30. Assembly space; 31. Buffer element; 40. Cover plate; 50. Protective plate; 60. Flange edge. DETAILED DESCRIPTION OF THE EXECUTION FORMS

[0020] Embodiments of the present application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout the document denote the same or similar elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are examples and serve solely to illustrate the present application and are not to be construed as limiting the present application.

[0021] In the description of the present application, the terms "middle", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "upper", "lower", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., which indicate a relationship with respect to orientation or position, are to be understood as being based on relationships with respect to orientation or position shown in the accompanying drawings. These terms serve only to better describe the present application and to simplify the description, and they do not indicate or imply that the device or element to which the application refers is based on the design of the application.that is referenced, must have a certain orientation, or must be constructed or operated in a certain orientation, and should therefore not be considered as restrictive to the present application.

[0022] In the description of the present application, "first feature" and "second feature" may comprise one or more of the features, and "a plurality of" means two or more. The first feature "above" or "below" the second feature may comprise direct contact between the first feature and the second feature, or contact between the first feature and the second feature through another feature in between. The first feature "above" or "above" the second feature comprises the fact that the first feature is located directly above or diagonally above the second feature, or it simply indicates that the first feature is positioned higher than the second feature in a horizontal plane.

[0023] The ground protection plate arrangement 100 according to an embodiment of the present application is described below with reference to the attached drawings.

[0024] Referring to the Fig. 1-4 comprises the ground protection plate arrangement 100 according to an embodiment of the present application: a ground protection plate 10 and a reinforcement plate 20.

[0025] In particular, the reinforcement plate 20 is located on one side of the base plate 10 and is arranged at a distance from the base plate 10. The reinforcement plate 20 has a plurality of (two or more) projecting sections 21, all of which project towards the base plate 10. One side of the plurality of projecting sections 21 pointing towards the base plate 10 (e.g., the lower side, which is in Fig. The base plate 10 (shown in Figure 1) is connected to the base plate 10. A plurality of (two or more) mounting spaces 30 are defined between the reinforcement plate 20 and the base plate 10. The mounting spaces 30 and the projecting sections 21 are arranged offset. This ensures a reliable connection between the base plate 10 and the reinforcement plate 20, which helps to improve the strength of the connection between the base plate 10 and the reinforcement plate 20. This can also improve the structural strength of the base plate assembly 100, thus ensuring good protective effect of the base plate assembly 100.

[0026] Furthermore, as in the Fig. 1 and Fig. As shown in Figure 4, the floor protection plate assembly 100 further comprises a buffer element 31. Each of the multiple mounting spaces 30 is equipped with the buffer element 31. The buffer element 31 can absorb the impact force acting on the floor protection plate assembly 100, thus helping to reduce the impact force and further ensuring that the floor protection plate assembly 100 provides good protection and meets the requirements of the ball impact test from below.

[0027] In some embodiments, both the base plate 10 and the reinforcement plate 20 can be steel plates, which gives both the base plate 10 and the reinforcement plate 20 good structural strength and simplifies assembly and connection, thereby improving assembly efficiency and also reducing production costs. For example, the steel plate can be roll-formed at 1200 MPa to ensure high structural strength of the reinforcement plate 20.

[0028] In some embodiments, the buffer element 31 can be a foam component, which facilitates the injection of foam into the mounting space 30. Furthermore, after hardening and shaping in the mounting space 30, the foam component exhibits good cushioning performance. Therefore, when the floor protection plate assembly 100 is in use, the buffer element 31 can better absorb the impact force, thus ensuring the effective protection provided by the floor protection plate assembly 100. For example, the buffer element 31 can be made of microcellular polypropylene foam (MPP foam).

[0029] In the ground protection plate arrangement 100 according to the embodiment of the present application, the plurality of mounting spaces 30 between the reinforcement plate 20 and the ground protection plate 10 are defined by connecting the plurality of projecting sections 21 of the reinforcement plate 20 to the ground protection plate 10. The mounting spaces 30 and projecting sections 21 are arranged offset, and each of the plurality of mounting spaces 30 is equipped with the buffer element 31. This ensures a reliable connection between the ground protection plate 10 and the reinforcement plate 20, which contributes to improving the strength of the connection between the ground protection plate 10 and the reinforcement plate 20. In this way, the structural strength of the ground protection plate arrangement 100 is improved.Furthermore, the multitude of buffer elements 31 can also absorb the impact force acting on the ground protection plate arrangement 100, which helps to reduce the impact force and to ensure that the ground protection plate arrangement 100 has a good protective effect and meets the requirements of the ball impact test from below.

[0030] In some embodiments of the present application, as in the Fig. As shown in Figures 1-4, the base plate 10 and the projecting section 21 are welded together, ensuring a reliable connection between the base plate 10 and the reinforcement plate 20 and achieving a better sealing effect. This eliminates the need for sealing structures using sealing foam and screws, as in related technologies, thus reducing production costs and increasing production efficiency.

[0031] In some embodiments of the present application, as in the Fig. As shown in Figures 1-3, a maintenance opening 11 is provided on the base plate 10, and the reinforcement plate 20 is configured to accommodate the maintenance opening 11. The maintenance opening 11 simplifies the maintenance of structures located on the base plate assembly 100, thus avoiding the complexity of having to disassemble the entire base plate assembly 100 for maintenance purposes, making maintenance more convenient and increasing efficiency.

[0032] In some embodiments, such as in the Fig. As shown in Figures 1-3, the ground protection plate arrangement 100 further comprises a cover plate 40. The cover plate 40 is located on the side of the ground protection plate 10 that faces away from the reinforcement plate 20 (e.g., the lower side, which is shown in Figure 1-3). Fig. (as shown in Figure 1). The cover plate 40 is removable and installed over the maintenance opening 11 to seal the maintenance opening 11 with the cover plate 40, thus improving the structural strength of the base plate 10. This prevents dust and other contaminants from entering through the maintenance opening 11 and damaging the structure of the base plate assembly 100, thereby ensuring good protection. Furthermore, the cover plate 40 can be removed, simplifying maintenance of the structure of the base plate assembly 100 through the maintenance opening 11.

[0033] It should be noted that, for the sake of simplicity, the terms ‘upper’, ‘lower’, ‘front’ and ‘rear’ in this application are based on the relationships relating to orientation as shown in the accompanying drawings and are not intended to limit the orientation in the application.

[0034] The battery pack according to one embodiment of the present application comprises a cell assembly and the base plate assembly 100. The base plate assembly 100, as described in the present embodiment, positions the cell assembly on the side of the reinforcement plate 20 that faces away from the base plate 10. The base plate assembly 100 can reduce the transmission of the impact force to the cell assembly, thus preventing risks such as explosion due to impact on the cell assembly. This can ensure the safety of the cell assembly during the ball impact test from below, thereby ensuring the safety of the battery pack in operation.

[0035] For example, in a ball impact test from below, the impact force generated by the ball is first transferred to the base plate 10 and then to the buffer element 31 and the reinforcement plate 20. Part of the impact force can be absorbed by the buffer element 31, which reduces the impact force of the ball impact and thus its effect on the cell assembly. This ensures that the penetration depth in the cell assembly is less than or equal to 2 mm, which meets the safety requirement that the penetration depth be less than 5 mm, and which reduces damage to the cell assembly from the impact force. Therefore, this can meet the requirements of the ball impact test, prevent risks such as explosion of the cell assembly, and improve the safety of the battery pack during operation.

[0036] Since the base plate assembly 100 according to the embodiment of the present application has the aforementioned advantageous technical effects, a plurality of mounting spaces 30 are defined between the reinforcement plate 20 and the base plate 10 in the battery pack according to the embodiment of the present application by connecting the plurality of projecting sections 21 of the reinforcement plate 20 to the base plate 10. The mounting spaces 30 and projecting sections 21 are arranged offset, and each of the plurality of mounting spaces 30 is equipped with the buffer element 31. This ensures a reliable connection between the base plate 10 and the reinforcement plate 20, which contributes to improving the strength of the connection between the base plate 10 and the reinforcement plate 20. In this way, the structural strength of the base plate assembly 100 is improved.Furthermore, the multitude of buffer elements 31 can also absorb the impact force acting on the ground protection plate arrangement 100, which helps to reduce the impact force and to ensure that the ground protection plate arrangement 100 has a good protective effect and meets the requirements of the ball impact test from below.

[0037] In some embodiments of the present application, an explosion-proof valve is provided on the side of the cell arrangement facing the base plate arrangement 100 (e.g., the lower side, which is shown in Fig. (as shown in Figure 1). In the event of a thermal runaway of the cell assembly, the explosion-proof valve can be opened to release the pressure from inside the cell assembly, which can prevent the risk of the cell assembly exploding and ensure the safety of the battery pack during operation.

[0038] Furthermore, as in the Fig. As shown in Figures 2-4, a protective plate 50 is provided between the cell assembly and the reinforcement plate 20. The protective plate 50 is positioned opposite the explosion-proof valve. The protective plate 50 prevents the pressure escaping after the explosion-proof valve opens from entering the base protection plate assembly 100, thus preventing damage to the external structure of the battery pack and ensuring the safety of the battery pack during operation.

[0039] In some embodiments, a plurality of (two or more) explosion-proof valves are provided on the cell assembly, arranged at intervals along the width direction of the cell assembly (e.g., in the left-right direction, which in Fig. (as shown in Figure 1). In the event of a thermal runaway of the cell assembly, the pressure inside the cell assembly can escape via the multitude of explosion-proof valves, ensuring reliable pressure release.

[0040] Furthermore, as in the Fig. As shown in Figures 2-4, a plurality of protective plates 50 are provided, each associated with one of the plurality of explosion-proof valves. The plurality of protective plates 50 prevent the pressure escaping after the plurality of explosion-proof valves opens from entering the base plate assembly 100, thus preventing damage to the external structure of the battery pack and ensuring the safety of the battery pack during operation.

[0041] In some embodiments, a plurality of (two or more) cell arrangements are provided, which are arranged at intervals along their width direction (e.g. in the left-right direction, which are in Fig. (as shown in Figure 1). The variety of cell arrangements can meet the usage requirements of the battery pack.

[0042] Furthermore, as in the Fig. As shown in Figures 2-4, a plurality of protective plates 50 are provided, each associated with one of the plurality of explosion-proof valves. The plurality of protective plates 50 prevent the pressure escaping after the plurality of explosion-proof valves opens from entering the base plate assembly 100, thus preventing damage to the external structure of the battery pack and ensuring the safety of the battery pack during operation.

[0043] In some embodiments, the explosion-proof valve has a dimension in the vertical direction (e.g., in the top-bottom direction, which is shown in Fig. (as shown in Figure 1) has a height of less than or equal to 12 mm, enabling a miniature battery pack design and reducing its footprint. Furthermore, the base plate assembly 100 reduces the transmission of impact force to the cell assemblies, preventing risks such as explosion due to impact. This ensures safety against ball impact from below within an effective vertical range, guaranteeing battery safety during operation. For example, in some specific embodiments, the explosion-proof valve has a vertical dimension of 12 mm, 11 mm, 10 mm, 9 mm, 8 mm, etc.

[0044] According to some embodiments of the present application, as in the Fig. As shown in Figures 1-4, the side of the projecting section 21 that points away from the base plate 10 (e.g., the upper side, which is shown in Figure 1-4) is on the side of the projecting section 21 that points away from the base plate 10 (e.g., the upper side, which is shown in Figure 1-4). Fig. (as shown in Figure 1), a groove 22 is provided. This improves the structural strength of the ground protection plate arrangement 100 and reduces its weight, thus fulfilling the requirement for a lightweight design.

[0045] Furthermore, as in the Fig. As shown in Figures 2-3, the protective plate 50 is located in the groove 22 and is positioned at a distance from the bottom of the groove 22, thus defining a drain channel 221. The side walls of the groove 22 are provided with the drain opening 211 on both sides of the protective plate 50, and the drain opening 211 is configured to communicate with the drain channel 221. In the event of thermal runaway of the cell assembly, the internal pressure, which escapes through the explosion-proof valve, can be released into the environment via the drain opening 211 and the drain channel 221. The drain opening 211 and the drain channel 221 can channel the internal pressure, thereby releasing the internal pressure and ensuring the operational safety of the battery pack.

[0046] In some embodiments, the protective plate 50 is connected to the cell assembly, which facilitates the arrangement with a gap between the protective plate 50 and the bottom of the groove 22. It also ensures the reliable fastening of the protective plate 50 and prevents problems such as movement. This effectively prevents pressure escaping through the explosion-proof valve from entering the bottom protective plate assembly 100, thus ensuring the safety of the battery pack during operation. For example, the protective plate 50 and the cell assembly are bonded together by adhesive, ensuring a reliable connection between the protective plate 50 and the cell assembly.

[0047] In some embodiments of the present application, as in the Fig. As shown in Figures 1-4, a plurality of (two or more) drain openings 211 are provided, and the plurality of drain openings 211 are arranged at intervals along the longitudinal direction of the projecting section 21 (e.g. in the front-back direction shown in Figure 1-4). Fig. (as shown in Figure 1). The multiple drain openings 211 are configured to communicate with the drain channel 221. These multiple drain openings facilitate the channeling of internal pressure within the cell assembly, which is then released via the explosion-proof valve. This allows the internal pressure to be directed through the drain openings 211 at various points into the drain channel 221, ensuring a uniform flow of pressure from the interior. This prevents the escaping pressure from accumulating and damaging the internal structure of the battery pack, thus ensuring the battery pack's operational safety.

[0048] According to some embodiments of the present application, the protective plate 50 can be a mica plate. A mica plate has good resistance to high temperatures, good strength and hardness, which can effectively prevent the pressure escaping after the opening of the explosion-proof valve from entering the base plate assembly 100, thus preventing damage to the external structure of the battery pack and ensuring the safety of the battery pack during operation.

[0049] In some embodiments of the present application, a protective layer is provided on the side of the reinforcement plate 20 that faces the cell arrangement (e.g., the upper side, which in Fig. (as shown in Figure 1). The protective layer can increase the structural strength of the base plate assembly 100 and prevent damage to the base plate assembly 100 when thermal runaway occurs in the cell assembly, thus preventing damage to the external structure of the battery pack and ensuring the safety of the battery pack during operation.

[0050] It should be noted that the protective layer can also be located on the cell assembly itself. In particular, the protective layer is provided on the side of the cell assembly facing the reinforcement plate 20, which also falls within the scope of protection of the present application.

[0051] In some embodiments where the explosion-proof valve is located on the side of the cell assembly facing the base plate assembly 100, the protective layer can prevent the pressure escaping after the explosion-proof valve is opened from entering the base plate assembly 100, thus preventing damage to the external structure of the battery pack and ensuring the safety of the battery pack during operation.

[0052] In some embodiments, such as in the Fig.As shown in Figures 1-4, a shell is provided on the cell assembly. A flanged edge 60 is provided on the outer circumferential wall of the base plate 10, which is connected to the shell. This arrangement ensures a reliable connection between the cell assembly and the base plate assembly 100, as well as reliable positioning of the cell assembly and the base plate assembly 100, so that the base plate assembly 100 can provide reliable protection for the cell assembly. For example, the cell assembly and the base plate 10 are connected by welding, which ensures a reliable connection and reduces production costs.

[0053] In some embodiments where the maintenance opening 11 is provided on the base plate 10, the battery pack includes electrical components located opposite the maintenance opening 11. The maintenance opening 11 simplifies the maintenance of the electrical components and avoids the complexity of having to disassemble the entire base plate assembly 100 for maintenance purposes. This makes maintenance more convenient and increases efficiency.

[0054] Furthermore, the cover plate 40 is located on the side of the base plate 10 facing away from the reinforcement plate 20. The cover plate 40 is removable and installed over the maintenance opening 11, thus sealing the maintenance opening 11. This improves the structural strength of the base plate 10 and prevents dust and other contaminants from entering through the maintenance opening 11 and damaging the electrical components, ensuring good protection. Additionally, the cover plate 40 can be removed, simplifying maintenance of the structures on the base plate assembly 100 through the maintenance opening 11.

[0055] Further configurations and operating procedures of the ground protection plate arrangement 100 and the battery pack according to the embodiments of the present application are known to those skilled in the art and are not described in detail here.

[0056] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, these terms may refer to a fixed connection, a detachable connection, or an integrated connection; these terms may denote a mechanical connection or an electrical connection; these terms may furthermore refer to a direct connection or an indirect connection via an intermediate medium or internal communication between two components. Those skilled in the art will understand the specific meanings of the aforementioned terms in this application based on the specific circumstances.

[0057] In the description of this specification, terms such as "embodiment," "specific embodiment," and "example" indicate that a specific feature, structure, material, or property described in connection with that embodiment or example is included in at least one embodiment or example of the present application. In the present disclosure, illustrative expressions of the foregoing terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or properties may be combined in any suitable manner in one or more embodiments or examples.

[0058] Even though embodiments of the present application have been shown and described, those skilled in the art understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the claims and their equivalents. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 202321569730.4

[0001]

Claims

[1] Ground protection plate arrangement, characterized by , that it includes: a floor protection plate; a reinforcing plate located on one side of the base plate and arranged at a distance from the base plate, wherein the reinforcing plate is provided with a plurality of projecting sections that project towards the base plate, wherein one side of each projecting section facing the base plate is connected to the base plate, wherein a plurality of mounting spaces are defined between the reinforcing plate and the base plate, and wherein the mounting spaces and the projecting sections are arranged offset; and a buffer element that is provided in each of the numerous assembly spaces. [2] Ground protection plate arrangement according to claim 1, characterized by that the base plate and the protruding sections are welded together. [3] Ground protection plate arrangement according to claim 1, characterized by that a maintenance opening is provided in the base plate and the reinforcement plate is configured to accommodate the maintenance opening. [4] Ground protection plate arrangement according to claim 3, characterized by , that it further includes: a cover plate located on one side of the floor protection plate, which is attached to the The reinforcement plate points away, and the cover plate is removable and arranged over the maintenance opening. [5] Battery pack, characterized by , that it includes: a ground protection plate arrangement according to one of claims 1-4; and a cell arrangement located on one side of the reinforcement plate, pointing away from the base protection plate. [6] Battery pack according to claim 5, characterized by, that an explosion-proof valve is provided on one side of the cell arrangement facing the base protection plate arrangement, and a protective plate is provided between the cell arrangement and the reinforcement plate, with the protective plate and the explosion-proof valve facing each other. [7] Battery pack according to claim 6, characterized by , that a groove is provided on one side of the projecting section, pointing away from the bottom guard plate, the guard plate being located in the groove and positioned at a distance from the bottom of the groove to form a drain channel, wherein a drain opening is provided on one side wall of the groove on both sides of the guard plate, and the drain opening is configured to communicate with the drain channel. [8] Battery pack according to claim 7, characterized by, that a plurality of drain openings are arranged at intervals along the longitudinal direction of the projecting section, and each of the plurality of drain openings is configured to be connected to the drain channel. [9] Battery pack according to claim 6, characterized by that the protective plate is a mica plate. [10] Battery pack according to claim 5, characterized by , that at least one side of the reinforcement plate facing the cell arrangement and one side of the cell arrangement facing the reinforcement plate is provided with a protective layer.

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