Battery box, battery pack and electric device

Abstract

The application relates to a battery box, a battery pack and a power utilization device. The battery box comprises a box body and a bottom cover. The bottom cover is arranged at one end of the box body along the height direction of the battery box. A plurality of reinforcing ribs are arranged on the bottom cover, which are recessed on one side of the bottom cover and protrude towards the other side. The plurality of reinforcing ribs comprise rolling ribs. The plurality of rolling ribs extend in the same direction and are recessed on the same side of the bottom cover. The outer surface of the bottom wall of each rolling rib forms a rolling surface for a rolling wheel. In the application, the rolling surface is formed by the rolling rib. The structural strength of the part of the bottom cover where the rolling rib is located is greatly improved. The structural strength of the area of the bottom cover that bears the force of the rolling wheel is improved. The ability to resist deformation under the action of the rolling wheel is improved. The risk of local stress deformation of the bottom cover is greatly reduced. The structural strength of the battery box and the battery pack is improved. Moreover, the reinforcing rib is a stamping rib and is integrated with the bottom cover. The structural strength is higher.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery boxes, battery packs and electrical devices. Background Technology

[0002] Battery packs are widely used as power supply devices in automobiles and other electrical appliances. The battery box, as a crucial component of the battery pack, serves to support and protect the battery modules. In related technologies, to facilitate the placement of the battery pack within the appliance's storage compartment, a limiting structure is installed on the bottom wall of the compartment, allowing the battery pack to slide into the compartment with relatively little effort. However, when sliding occurs at the bottom of the battery pack, localized stress can cause deformation, affecting the structural strength of the battery pack. Summary of the Invention

[0003] Therefore, it is necessary to provide a battery box, battery pack, and power supply device to address the problem that the battery pack is easily deformed by force during sliding.

[0004] In a first aspect, this application proposes a battery box, comprising:

[0005] Box;

[0006] The bottom cover is located at one end of the battery box along the height direction. The bottom cover is provided with a plurality of reinforcing ribs that are recessed on one side and protrude toward the other side.

[0007] The plurality of reinforcing ribs include rolling ribs, which extend longitudinally in the same direction and are recessed on the same side of the bottom cover. The outer surface of the bottom wall of each rolling rib forms a rolling surface for the roller to roll.

[0008] In some embodiments, each of the rolling ribs is recessed on the side opposite to the housing.

[0009] In some embodiments, the plurality of reinforcing ribs include auxiliary ribs, the auxiliary ribs and the rolling ribs are recessed on different sides of the bottom cover, each of the rolling ribs includes two opposing sidewalls that intersect and connect with the bottom wall, the auxiliary ribs are disposed at the intersection of the bottom wall and the sidewalls, and the plurality of auxiliary ribs are spaced apart along the longitudinal direction of the rolling ribs.

[0010] In some embodiments, the plurality of reinforcing ribs include reinforcing ribs that are recessed on the same side of the bottom cover as the rolling ribs and intersect with the rolling ribs; the recess depth of the rolling ribs is greater than or equal to the recess depth of the reinforcing ribs.

[0011] In some embodiments, the plurality of reinforcing ribs include the auxiliary ribs and the reinforcing ribs, and there are instances where the auxiliary ribs intersect with the reinforcing ribs.

[0012] In some embodiments, the plurality of reinforcing ribs further include guide ribs; the guide ribs are connected to one end of the rolling ribs and extend longitudinally in the same direction as the rolling ribs; the outer surface of the bottom wall of the guide ribs forms a guide surface for guiding the rollers into the rolling surface;

[0013] The distance between the guide surface and the rolling surface in the height direction of the battery box decreases gradually along the longitudinal direction of the guide rib toward the side where the rolling rib is located.

[0014] In some embodiments, the guide rib includes a plurality of guide segments, each of which is arranged sequentially along the longitudinal direction of the guide rib; the outer surfaces of all the guide segments constitute the guide surface, and the closer to the rolling rib, the smaller the distance between the outer surface of the guide segment and the rolling surface.

[0015] In some embodiments, the guide rib includes a first guide segment and a second guide segment, the first guide segment being connected between the second guide segment and the rolling rib, wherein:

[0016] The first guide segment is recessed in the same direction as the rolling rib, and the second guide segment is recessed in the opposite direction to the rolling rib; and / or, the recess depth of the first guide segment is greater than the recess depth of the second guide segment, and the recess width of the first guide segment is greater than the recess width of the second guide segment.

[0017] In some embodiments, the bottom cover includes a main body and a fixed edge, the fixed edge being disposed around the circumference of the main body, the main body being disposed opposite to the housing body relative to the fixed edge, and the reinforcing rib being disposed on the main body; the fixed edge being fixedly connected to the housing body.

[0018] In some embodiments, the fixed edge is provided with an edge rib, the edge rib is recessed on one side of the fixed edge and protrudes towards the other side, the fixed edge is provided with a connecting hole, the box body is fastened to the fixed edge by a fastener, the fastener passes through the connecting hole, and the edge rib is provided adjacent to the connecting hole.

[0019] In some embodiments, the plurality of reinforcing ribs include edge ribs disposed at the edge of the body and recessed on a different side of the bottom cover from the rolling ribs, the edge ribs forming an opening that extends along their extension direction.

[0020] In some embodiments, a limiting groove is provided at the bottom of the battery box, and the limiting groove is located on one side of the longitudinal direction of the rolling rib.

[0021] In some embodiments, the limiting groove includes a first groove recessed into the fixed edge.

[0022] In some embodiments, the housing includes a flange fixedly connected to the fixed edge, the flange being folded outwards towards the outside of the housing, and the limiting groove further includes a second groove recessed in the flange, the second groove being disposed opposite to the first groove along the height direction.

[0023] Secondly, this application proposes a battery pack, including a battery cell and the battery box described in the first aspect, wherein the battery cell is disposed inside the battery box.

[0024] Thirdly, this application proposes an electrical device, including a housing and a battery pack as described in the second aspect. The inner bottom wall of the housing is provided with rollers, and the side wall of the housing is provided with a receiving opening. The battery pack is slidably supported on the rollers by the rolling surface so as to be slidably received in the housing through the receiving opening.

[0025] In some embodiments, a limiting member is provided on the inner bottom wall of the containment chamber. The limiting member is located at the containment opening of the containment chamber. The limiting member is controllable to switch between a limiting state and an avoidance state. When in the avoidance state, the limiting member allows the battery pack to enter the containment chamber through the containment opening. When in the limiting state, the limiting member is engaged with a limiting groove on the battery box.

[0026] Compared with the prior art, this application has the following beneficial effects:

[0027] The aforementioned battery box, battery pack, and electrical device, due to the rolling surface being formed by rolling ribs, significantly enhance the structural strength of the bottom cover where the rolling ribs are located. This improves the structural strength of the area on the bottom cover that bears the force of the rollers, increasing its resistance to deformation caused by the rollers and greatly reducing the risk of localized deformation of the bottom cover. Furthermore, in practical applications, the reinforcing ribs are integrated with the bottom cover as stamped ribs, resulting in even higher overall structural strength of the bottom cover. Attached Figure Description

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0029] Figure 1 This is a schematic diagram of the containment chamber in some embodiments.

[0030] Figure 2 This is a schematic diagram of the external shape of the battery box in some embodiments;

[0031] Figure 3 for Figure 2 An exploded view of the battery box is shown.

[0032] Figure 4 These are schematic diagrams of the bottom cover structure in some embodiments;

[0033] Figure 5 for Figure 4 The bottom view of the cover shown;

[0034] Figure 6 for Figure 5 Sectional view at point AA;

[0035] Figure 7 for Figure 5 Sectional view at point BB;

[0036] Figure 8 for Figure 5 Sectional view at CC;

[0037] Figure 9 for Figure 4 Enlarged view of point D in the middle.

[0038] The reference numerals in the detailed embodiments are as follows:

[0039] 100. Battery box; X, length direction; Y, width direction; Z, height direction; 10. Box body; 11. Side panel; 12. Flanged edge; 20. Bottom cover; 21. Main body; J, reinforcing rib; J1, rolling rib; m1, rolling surface; J2, auxiliary rib; J3, reinforcing rib; J4, guide rib; m2, guide surface; J41, guide section; J41a, first guide section; J41b, second guide section; J5, edge rib; b1 1. Bottom wall; b2. Side wall; w1. Recess depth of rolling rib; w2. Recess depth of reinforcing rib; w3. Recess depth of guide rib; q. Opening; 22. Fixed edge; 22a. Edge rib; 22b. Connecting hole; C. Limiting groove; C1. First groove; C2. Second groove; 30. Top cover; 40. Lifting component; 50. Fastener; 200. Reception chamber; 201. Roller; 202. Limiting component; R. Reception opening. Detailed Implementation

[0040] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0041] In the description of this application, it should be understood that, where they appear, the terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0042] Furthermore, where applicable, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., shall be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral part; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; they may refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] It should be noted that, if an element is described as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is described as "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0046] In order to improve the strength of the bottom of the battery pack and prevent it from deforming due to the action of the rollers, this application proposes a battery box, a battery pack and an electrical device.

[0047] The battery pack described in this application includes a battery box and individual battery cells housed within the battery box. Each individual battery cell is the smallest unit in the battery pack where an electrochemical reaction takes place, and can be a secondary or primary battery. Each individual battery cell can be a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. Each individual battery cell can be cylindrical, flat, cuboid, or other shapes.

[0048] In some embodiments, the battery cell includes a housing, an end cap, and an electrode assembly. The housing and the end cap together form an internal space for accommodating the electrode assembly. Specifically, a receiving cavity may be formed within the housing, with at least one end open. The end cap closes to the open end of the housing to seal the receiving cavity, and the electrode assembly is mounted within the receiving cavity. The housing may be, but is not limited to, a metal housing, such as an aluminum housing or a steel housing.

[0049] Electrode assemblies typically include a positive electrode, a negative electrode, and a separator separating the positive and negative electrodes. An electrolyte can be injected into the battery cell, wetting the interior of the electrode assembly and providing ion migration pathways for electrochemical reactions, as well as conducting electricity. Electrode assemblies can be in the form of wound, stacked, etc. One or more electrode assemblies can be installed within a single battery cell.

[0050] The battery pack in this application embodiment is used to provide electrical energy to an electrical device. The electrical device can be, but is not limited to, electric vehicles, ships, aircraft, etc. Taking a vehicle as an example, the battery pack can be located at the rear, front, or bottom of the vehicle. The battery can provide electrical energy for the vehicle's drive and also for the vehicle's control system.

[0051] In some embodiments, refer to Figure 1The electrical device has a housing compartment 200. Rollers 201 are provided on the inner bottom wall of the housing compartment 200. A receiving opening R is provided on the side wall b2 of the housing compartment 200. The battery pack is slidably supported by the rollers 201 and is slidably received within the housing compartment 200 through the receiving opening R. At least one battery pack can be received within the same housing compartment 200. At least one housing compartment 200 can be configured within the electrical device.

[0052] In one embodiment, the bottom of the containment chamber 200 is provided with multiple rows of rollers 201. These multiple rows of rollers 201 are used together to slide and support the same battery pack, thereby increasing the contact area between the battery pack and the rollers 201, dispersing the force exerted by the rollers 201, and reducing the local stress on the battery pack. Understandably, the arrangement direction of the rollers 201 in each row is consistent with the sliding direction of the battery pack.

[0053] In one embodiment, a limiting member 202 is provided on the inner bottom wall of the containment chamber 200. The limiting member 202 is located at the containment opening R of the containment chamber 200. The limiting member 202 is controllable to switch between a limiting state and an avoidance state. When in the avoidance state, the limiting member 202 allows the battery pack to enter the containment chamber 200 through the containment opening R of the containment chamber 200. When in the limiting state, the limiting member 202 is locked and engaged with the battery box 100.

[0054] There are various specific constructions for the limiting member 202, which will not be exhaustive here. As an example, the limiting member 202 includes a slot and a latch. The latch is rotatably connected to the inner wall of the slot. A torsion spring is mounted on the latch's pivot, providing elasticity to cause the latch to rotate in the direction of disengagement from the slot. A locking latch is provided on the latch, and the inner wall of the slot has a recess that mates with the locking latch. In practical application, pressing the locking latch engages it in the recess to keep it engaged in the slot, thus avoiding the battery pack and allowing it to slide from the receiving opening R into the receiving chamber 200. Pressing the locking latch again disengages it from the recess, and under the action of the torsion spring, the latch rotates out of the slot, thus limiting the battery pack and preventing it from disengaging from the receiving opening R.

[0055] The battery box 100 of this application embodiment will be described in detail below.

[0056] Please refer to Figure 2 , Figure 3 and Figure 4 The battery box 100 in this embodiment includes a box body 10 and a bottom cover 20. The bottom cover 20 is disposed at one end of the box body 10 along the height direction Z of the battery box 100. A plurality of reinforcing ribs J are provided on the bottom cover 20, recessed on one side and protruding towards the other side. These reinforcing ribs J include rolling ribs J1, which extend longitudinally in the same direction and are recessed on the same side of the bottom cover 20. The outer surface of the bottom wall b1 of each rolling rib J1 forms a rolling surface m1 for the roller 201 to roll.

[0057] The enclosure 10 forms the main internal space of the battery box 100. The bottom of the enclosure 10 is open, and the bottom cover 20 covers the open bottom end. The battery box 100 is slidably supported on the rollers 201 of the receiving chamber 200 by the bottom cover 20. The bottom cover 20 and the enclosure 10 can be fastened together, welded or otherwise connected.

[0058] Multiple reinforcing ribs J are provided on the bottom cover 20. Each reinforcing rib J is recessed on one side of the bottom cover 20 and protrudes from the other side along the thickness direction of the bottom cover 20, i.e., the height direction Z of the battery box 100. Specifically, the reinforcing rib J can be recessed from the inside to the outside of the bottom cover 20 (the recess direction points to the outside of the bottom cover 20), that is, the reinforcing rib J appears to bulge when viewed from the outside of the bottom cover 20, or it can be recessed from the outside to the inside of the bottom cover 20 (the recess direction points to the inside of the bottom cover 20), that is, the reinforcing rib J appears to bulge when viewed from the inside of the bottom cover 20. The reinforcing ribs J improve the structural strength of the bottom cover 20.

[0059] In practical applications, the reinforcing rib J can be obtained through stamping. As a stamped rib, the reinforcing rib J is not only convenient for mass production, but also, due to the continuity of the material, the force is transmitted very smoothly and efficiently in the rib section, which can significantly increase the moment of inertia of the bottom cover 20, effectively enhance the rigidity and bending resistance of the bottom cover 20. The stamping transition part is generally designed with rounded corners, which can greatly reduce stress concentration and has a strong ability to withstand vibration and fatigue loads.

[0060] At least some of the reinforcing ribs J are rolling ribs J1, and multiple rolling ribs J1 extend in the same direction in a strip shape. The extension direction can be the length direction or the width direction of the battery box 100. Generally, the number of rolling ribs J1 corresponds to the number of rows of rollers 201 in the housing 200 of the electrical device, and one rolling rib J1 is provided for each row of rollers 201.

[0061] The outer surface of the rolling rib J1 is the surface of the bottom cover 20 that is away from the outer side of the housing 10. The outer surface is flat. If the rolling rib J1 is recessed inside the bottom cover 20, the outer surface is located on the convex surface of the rolling rib J1. If the rolling rib J1 is recessed outside the bottom cover 20, the outer surface is located on the concave surface of the rolling rib J1.

[0062] Each rolling rib J1 has its outer surface serving as a rolling surface m1. In practical applications, the battery box 100 slides along the arrangement direction of the rollers 201 through contact with the rolling surface m1, thereby changing the friction force during battery box 100 installation from sliding to rolling, reducing thrust, allowing for manual assembly, and reducing assembly difficulty. Understandably, the rolling rib J1 includes a side wall b2 and a bottom wall b1. Along the width direction of the rolling rib J1 (perpendicular to its extension direction), both sides of the bottom wall b1 are connected to the side wall b2. The side wall b2 connects the bottom wall b1 to the rest of the bottom cover 20, and the outer surface of the rolling rib J1 is the outer surface of the bottom wall b1. When the roller 201 acts on the rolling surface m1, the supporting force of the roller 201 acts on the bottom wall b1, causing the bottom wall b1 to deform inward, which is hindered by the side wall b2. This allows the rolling rib J1 to resist the action of the roller 201 with minimal or no deformation, greatly improving the structural strength of the contact area between the bottom cover 20 and the roller 201.

[0063] In summary, the aforementioned battery box 100, due to the rolling surface m1 being formed by rolling ribs J1, significantly enhances the structural strength of the bottom cover 20 where the rolling ribs J1 are located. This improves the structural strength of the area on the bottom cover 20 that bears the force of the rollers 201, enhancing its resistance to deformation caused by the rollers 201. This greatly reduces the risk of localized deformation of the bottom cover 20 and improves the structural strength of the battery box 100 and the battery pack. Furthermore, in practical applications, the rolling ribs J1 are integrated with the bottom cover 20 as stamped ribs (i.e., obtained through stamping), resulting in even higher structural strength.

[0064] In some embodiments, combined with Figure 3 and Figure 4 It is understood that each rolling rib J1 is recessed on the side opposite to the housing 10. That is, the rolling rib J1 is recessed towards the outside of the bottom cover 20, and the rolling surface m1 is located on the convex surface of the rolling rib J1.

[0065] At this time, when the roller 201 slides along the rolling surface m1, it does not contact the side wall b2 of the rolling rib J1, and will not wear the side wall b2, which helps to improve the strength of the battery box 100. Moreover, setting the rolling surface m1 on the convex surface of the rolling rib J1 makes it easier to process and ensure the smoothness and straightness of the rolling surface m1, reducing the cost of post-processing (such as polishing).

[0066] Of course, in other embodiments, the rolling rib J1 can also be recessed towards the side where the housing 10 is located, that is, the rolling rib J1 is recessed towards the inner side of the bottom cover 20, and the rolling surface m1 is located on the concave surface of the rolling rib J1. In this case, the groove structure formed by the rolling rib J1 has a certain guiding effect on the roller 201, preventing the roller 201 from derailing.

[0067] In some embodiments, refer to Figure 4 and Figure 5The plurality of reinforcing ribs J includes auxiliary ribs J2, which are recessed on different sides of the bottom cover 20 along with the rolling ribs J1. Each rolling rib J1 includes two opposing sidewalls b2 that intersect and connect with the bottom wall b1. The auxiliary ribs J2 are located at the intersection of the bottom wall b1 and the sidewalls b2. The plurality of auxiliary ribs J2 are spaced apart along the longitudinal direction of the rolling ribs J1.

[0068] If the rolling rib J1 is recessed on the inner side of the bottom wall b1, then the auxiliary rib J2 is recessed on the outer side of the bottom wall b1. Conversely, if the rolling rib J1 is recessed on the outer side of the bottom wall b1, then the auxiliary rib J2 is recessed on the inner side of the bottom wall b1. For example, viewed from the outer side of the bottom cover 20, if the rolling rib J1 protrudes, then the auxiliary rib J2 is recessed. This combination of positive and negative recesses greatly reduces local bending stress, counteracts stamping springback, improves overall flatness, and ensures sliding reliability.

[0069] Understandably, the sidewalls b2 of the rolling rib J1 are arranged on opposite sides of its bottom wall b1 in the width direction of the rolling rib J1. Auxiliary ribs J2 are provided at the intersection of the bottom wall b1 and the sidewalls b2 of the rolling rib J1, that is, part of the auxiliary rib J2 is provided on the bottom wall b1 and another part is provided on the sidewall b2. Alternatively, auxiliary ribs J2 can be provided at the intersections of both sidewalls b2 and the bottom wall b1. Alternatively, multiple auxiliary ribs J2 can be provided on the same side of the bottom wall b1 in the width direction of the rolling rib J1, and these multiple auxiliary ribs J2 are spaced apart along the longitudinal direction of the rolling rib J1. Alternatively, all auxiliary ribs J2 can be symmetrically arranged on both sides of the bottom wall b1 in the width direction of the rolling rib J1.

[0070] Understandably, when the battery pack is supported on the roller 201 by the rolling rib J1, the rolling rib J1, as the main load-bearing structure, generally experiences the greatest stress and is most prone to fatigue cracking at the intersection of the side wall b2 and the bottom wall b1 (forming a corner) when subjected to rolling load. When the rolling rib J1 is subjected to upward pressure, its side wall b2 tends to open outward, while the bottom wall b1 tends to bend upward. At this time, the auxiliary rib J2 is set at the intersection of the side wall b2 and the bottom wall b1. The presence of the auxiliary rib J2 acts like a "hoop," strongly constraining this deformation, which greatly improves the stiffness and bending strength of the rolling rib J1, making it less prone to permanent deformation.

[0071] Moreover, the auxiliary rib J2 can more smoothly distribute the stress concentrated at the intersection to other areas of the rolling rib J1, greatly reducing the stress peak and suppressing the generation and propagation of fatigue cracks.

[0072] In addition, the auxiliary rib J2 provides additional support for the side wall b2. When the side wall b2 is subjected to lateral force or torsional load (such as the roller 201 shifting or getting stuck), the side wall b2 is less likely to buckle inward or outward, making the stability and torque resistance of the entire structure stronger.

[0073] It is worth noting that the auxiliary ribs J2 are only provided in local areas on both sides of the bottom wall b1, and will not affect the flatness of the rolling surface m1 of the rolling ribs J1, thus not affecting its function of contacting the roller 201. Specifically, the auxiliary ribs J2 can be provided at intervals along the extension direction of the rolling ribs J1, which can further reduce stress concentration and absorb the micro-deformation of the bottom wall when subjected to the load of the roller 201, thereby extending the fatigue life of the rolling rib J1 area.

[0074] In some embodiments, continue to refer to Figure 4 and Figure 5 The plurality of reinforcing ribs J includes reinforcing rib J3, which is recessed on the same side of the bottom cover 20 as the rolling rib J1. The reinforcing rib J3 intersects with the rolling rib J1. The recessed depth w1 of the rolling rib J1 is greater than or equal to the recessed depth w2 of the reinforcing rib J3, ensuring that the rolling surface m1 is higher than the reinforcing rib J3 and will not move to the reinforcing rib J3.

[0075] Specifically, multiple reinforcing ribs J3 can be configured, and these multiple reinforcing ribs J3 are arranged at intervals along the longitudinal direction of the rolling ribs J1. The reinforcing ribs J3 can be arranged in the area near the edge of the bottom cover 20. When multiple rolling ribs J1 are provided, each reinforcing rib J3 can intersect with each rolling rib J1 simultaneously. Of course, each reinforcing rib J3 can also intersect with only one rolling rib J1. Preferably, the extending direction of the reinforcing rib J3 is perpendicular to the longitudinal direction of the rolling rib J1. In this case, the stress dispersion efficiency of the reinforcing rib J3 is the highest, which also simplifies processing and reduces costs. Preferably, each rolling rib J1 has reinforcing ribs J3 intersecting and connecting on both opposite sides in its width direction, so the rolling rib J1 is subjected to symmetrical force and has a higher stress dispersion efficiency.

[0076] In a specific application, the battery box has a square shape, with the rolling rib J1 extending along the length direction X of the battery box 100 and the reinforcing rib J3 extending along the width direction Y of the battery box 100.

[0077] Among them, combined Figure 6 and Figure 7 The recessed depth of reinforcing rib J refers to the maximum space occupied by the concave surface of reinforcing rib J in the height direction Z of the battery box 100. It can be understood as the distance between the highest and lowest points of the concave surface of reinforcing rib J, or the distance between the highest and lowest points of the convex surface of reinforcing rib J.

[0078] It is worth noting that if the reinforcing rib J is recessed inwards towards the bottom cover 20, the outer surface of the bottom cover 20 includes the concave surface of the reinforcing rib J, and the inner surface of the bottom cover 20 includes the convex surface of the reinforcing rib J. Similarly, if the reinforcing rib J is recessed outwards towards the bottom cover 20, the outer surface of the bottom cover 20 includes the convex surface of the reinforcing rib J, and the inner surface of the bottom cover 20 includes the concave surface of the reinforcing rib J.

[0079] Rolling rib J1 and reinforcing rib J3 are typically located on the same plane of the bottom cover 20. One configuration involves both rolling rib J1 and reinforcing rib J3 being recessed from the inside to the outside of the bottom cover 20, and both protruding outwards. The rolling surface m1 is located on the convex surface of the rolling rib J1. If the recess depth w1 of the rolling rib J1 is greater than or equal to the recess depth w2 of the reinforcing rib J3, then the most convex position of the rolling rib J1 (located on the rolling surface m1) is further away from the inside of the bottom cover 20 than the most convex position of the reinforcing rib J3. This ensures that when the roller 201 contacts the rolling surface m1, it is not interfered with by the reinforcing rib J3, guaranteeing smooth rolling and functional purity.

[0080] Another approach is to have both the rolling rib J1 and the reinforcing rib J3 recessed from the outside of the bottom cover 20 inwards, with the rolling surface m1 located on the concave surface of the rolling rib J1. The recess depth w1 of the rolling rib J1 is greater than or equal to the recess depth w2 of the reinforcing rib J3, meaning that the concave surface of the rolling rib J1 is more recessed than that of the reinforcing rib J. When the roller 201 rolls along the recessed side of the rolling rib J1, it can only contact the bottom of the groove of the deeper rolling rib J1 (i.e., the rolling surface m1) and the side wall b2 of the rolling rib J1, and will not contact the concave surface of the reinforcing rib J3, thus ensuring smooth rolling and the purity of function.

[0081] Furthermore, the reinforcing rib J3 and the rolling rib J1 are recessed on the same side of the bottom cover 20 and intersect. Due to the stamping process, the material thickness in the intersection area of ​​the two ribs is relatively increased, which greatly increases the moment of inertia of the section in this area. When the pressure of the roller 201 attempts to deform the bottom wall b1 of the rolling rib J1 upwards through the bottom wall b1, the intersecting reinforcing rib J3 provides strong counter-support like a "pillar," significantly suppressing the deformation of the rolling rib J1. This allows the rolling rib J1 to maintain its shape well even under heavy loads, ensuring smooth rolling. Moreover, the stress at the rolling rib J1 can be efficiently dispersed to other areas of the bottom cover 20 through the reinforcing rib J3, diverting the stress load on the rolling rib J1, avoiding excessive stress accumulation at the root of the rolling rib J1, reducing the generation of fatigue cracks at the root of the rolling rib J1, and improving the service life of the entire structure.

[0082] In some embodiments, refer to Figure 4 and Figure 5 The multiple reinforcing ribs J include the aforementioned auxiliary ribs J2 and reinforcing ribs J3, and there are intersections between auxiliary ribs J2 and reinforcing ribs J3. That is to say, auxiliary ribs J2 are set in the area where the rolling ribs J1 and reinforcing ribs J3 intersect. The intersection of auxiliary ribs J2, reinforcing ribs J3 and rolling ribs J1 creates a local composite node with very strong performance, which has a significant effect on improving stiffness, strength, fatigue resistance and stress transfer efficiency.

[0083] In practical applications, when the battery pack is housed in the housing chamber 200 and slides into place, the roller 201 maintains contact with the intersection of the auxiliary rib J2, the reinforcing rib J3, and the rolling rib J1, providing a force that causes deformation to this location for a long time. The stress concentration in this area is obvious. Setting the intersection of the three reinforcing ribs J in this area can effectively disperse the stress and avoid excessive stress peaks. The deformation resistance of this area is greatly improved, and it is not easy to deform even if it maintains long-term contact with the roller 201.

[0084] In some embodiments, refer to Figure 4 and Figure 5 and combined Figure 8 and Figure 9 It is understood that the multiple reinforcing ribs J also include guide ribs J4, which are connected to one end of the rolling ribs J1 and extend longitudinally in the same direction as the rolling ribs J1. The outer surface of the bottom wall b1 of the guide ribs J4 forms a guide surface m2 for guiding the roller 201 into the rolling surface m1. The distance h between the guide surface m2 and the rolling surface m1 in the height direction Z of the battery box 100 decreases gradually along the longitudinal direction of the guide ribs J4 toward the side where the rolling ribs J1 are located.

[0085] The guide rib J4 extends in the same direction as the rolling rib J1, and the guide surface m2 is the outer surface of the guide rib J4 located on the outside of the bottom cover 20, which is smoothly connected to the rolling surface m1. In addition, the guide rib J4 can also be set at both ends of the rolling rib J1 to improve the overall applicability.

[0086] Taking the concave shape of the rolling rib J1 towards the outer side of the bottom cover 20 as an example, the distance h between the guide surface m2 and the rolling surface m1 in the height direction Z gradually changes. This indicates that the guide surface m2 is uneven at both ends in its longitudinal direction, and its size gradually changes. The closer it is to the rolling surface m1, the smaller the height difference between the guide surface m2 and the rolling surface m1. In practical applications, when the battery box 100 slides into the receiving chamber 200, the roller 201 gradually enters the rolling surface m1 under the guidance of the guide surface m2 and rolls into contact with the rolling surface m1. This makes the battery box 100 slide more smoothly and steadily onto the roller 201 of the receiving chamber 200, reducing the difficulty of operation.

[0087] It is worth noting that the guide rib J4 can be recessed in the same direction as the rolling rib J1, or it can be recessed in the opposite direction to the rolling rib J1. Alternatively, part of the guide rib J4 can be recessed in the same direction as the rolling rib J1, while the other part of the guide rib J4 can be recessed in the opposite direction to the rolling rib J1. As long as the condition is met that the distance h between the guide surface m2 and the rolling surface m1 in the height direction Z of the battery box 100 decreases along the longitudinal direction of the guide rib J4 toward the side where the rolling rib J1 is located, it is acceptable.

[0088] Specifically, in the embodiments, combined with Figure 8 and Figure 9It is understood that the guide rib J4 includes multiple guide segments J41, and each guide segment J41 is arranged sequentially along the longitudinal direction of the guide rib J4. The outer surfaces of all the guide segments J41 together constitute the aforementioned guide surface m2. The closer to the rolling rib J1, the smaller the distance between the outer surface of the guide segment J41 and the rolling surface m1.

[0089] As the distance between the guide segment J41 and the rolling surface m1 decreases as it gets closer to the rolling rib J1, each guide segment J41 forms a stepped guide surface m2 with a smooth transition at the step, allowing the roller 201 to gradually slide to the rolling surface m1 as if walking on steps.

[0090] At this point, the guide segment J41 forms a stepped guide surface m2, which simplifies the processing of the guide surface m2 and reduces costs.

[0091] In one specific embodiment, combined with Figure 8 and Figure 9 It is understood that the guide rib J4 includes a first guide segment J41a and a second guide segment J41b, with the first guide segment J41a connecting the second guide segment J41b and the rolling rib J1. In this way, the two guide segments J41 form a stepped guide surface m2, which greatly simplifies the forming of the guide rib J4.

[0092] Further in the embodiments, combined with Figure 8 and Figure 9 It is understood that the first guide segment J41a is concave in the same direction as the rolling rib J1, while the second guide segment J41b is concave in the opposite direction to the rolling rib J1.

[0093] In a specific example, the first guide segment J41a and the rolling rib J1 are both recessed towards the outer side of the bottom cover 20, while the second guide segment J41b is recessed towards the inner side of the bottom cover 20. The first guide segment J41a and the second guide segment J41b are recessed towards different sides of the bottom cover 20, resulting in a height difference between their respective outer surfaces and the rolling surface m1, thus creating a stepped guide surface m2.

[0094] Designing the first guide segment J41a to be concave in the same direction as the rolling rib J1 effectively shortens the height difference between the guide surface m2 and the rolling surface m1 of the first guide segment J41a. Designing the second guide segment J41b to be concave in the opposite direction to the rolling rib J1 creates a stepped bevel that is initially gentle and then steepens, reducing the inlet slope and making it easier for the roller 201 to enter the guide surface m2. Furthermore, the concave first guide segment J41a and the second guide segment J41b together form the guide rib J4. Compared to the single-direction concavity of each guide segment J41, this staggered rib design helps reduce warping and internal stress after molding of the guide rib J4, improves the flatness and dimensional stability of the bottom cover 20, and also enhances the buckling stability and torsional stiffness of the guide rib J4.

[0095] Further in the embodiments, refer to Figure 8 and Figure 9 The recess depth w3 of the first guide segment J41a is greater than the recess depth w4 of the second guide segment J41b, and the recess width d1 of the first guide segment J41a is greater than the recess width d2 of the second guide segment J41b.

[0096] The recess width of guide segment J41 refers to the dimension of its recessed end in the width direction of guide segment J41, viewed from its recessed side. The width direction of guide segment J41 is perpendicular to its longitudinal direction. During the stamping process of guide segment J41, the die forces the sheet metal to stretch and bend. The deeper the guide segment J41, the longer the required stretching length, and the more severe the material thinning. Therefore, designing a larger recess width d1 for the first guide segment J41a with a greater recess depth provides a larger stretching area for the material, mitigates strain concentration, and prevents the material from undergoing severe localized tensile deformation and fracture, making it easier to form guide segment J41.

[0097] In a preferred embodiment, the first guide segment J41a and the second guide segment J41b are recessed in opposite directions, and the recess depth w3 of the first guide segment J41a is greater than the recess depth w4 of the second guide segment J41b. This design not only has the effects of the above embodiments, but also reduces the height difference between the two ends of the guide surface m2 by making the height difference change of the slope formed by the guide surface m2 more gradual. This makes it easier for the roller 201 to roll onto the rolling surface m1, and makes it easier to manually push the battery box 100 to slide into the housing pod 200.

[0098] Of course, in other embodiments, the first guide segment J41a and the second guide segment J41b may have the same concave direction, for example, both concave in the same direction as the rolling rib J1, or both concave in the opposite direction to the rolling rib J1. When the first guide segment J41a and the second guide segment J41b are both concave in the opposite direction to the rolling rib J1, in a specific embodiment, the ends of the rolling element intersect with a reinforcing rib J3, and the first guide segment J41a can be concave on the reinforcing rib J3 to reduce the height difference between the guiding surface m2 and the rolling surface m1 of the first guide segment J41a, making it easier to achieve a design where w3 is greater than w4 when the first guide segment J41a and the second guide segment J41b are concave in the same direction.

[0099] In some embodiments, refer to Figure 4 and Figure 5 The bottom cover 20 includes a main body 21 and a fixed edge 22. The fixed edge 22 is arranged around the main body 21. The main body 21 protrudes away from the box body 10 relative to the fixed edge 22. The reinforcing rib J is arranged on the main body 21. The fixed edge 22 is used to fix and connect with the box body 10.

[0100] The fixed edge 22 can be continuously set around the perimeter of the main body 21 or partially set. To reduce costs, the fixed edge 22 can be fastened to the housing 10 using screws, bolts, pins, or other structural means. The main body 21 protrudes outward relative to the fixed edge 22, forming a stamping space that communicates with the space of the housing 10. When the reinforcing rib J on the main body 21 is recessed towards the inside of the bottom cover 20, it occupies the stamping space instead of occupying the space of the housing 10, thus improving the utilization rate of the space of the housing 10. In addition, the reinforcing rib J can maintain a certain distance from the battery cells inside the housing 10, effectively preventing stress on the reinforcing rib J from being transmitted to the battery cells and causing problems such as battery cell vibration.

[0101] Generally, the bottom cover 20 is square in shape. It is easily understood that the reinforcing rib J includes at least a rolling rib J1, with both ends of the rolling rib J1 extending toward the opposite sides of the main body 21. When the reinforcing rib J includes a strengthening rib J3, both ends of the strengthening rib J3 may also extend toward the other opposite sides of the main body 21.

[0102] In some embodiments, refer to Figure 4 and Figure 5 A rib 22a is provided on the fixed edge 22. The rib 22a is recessed on one side of the fixed edge 22 and protrudes towards the other side. A connecting hole 22b is provided on the fixed edge 22. The housing 10 is fastened to the fixed edge 22 by a fastener 50, which passes through the connecting hole 22b. The rib 22a and the connecting hole 22b are arranged adjacent to each other.

[0103] Fastener 50 can be a screw, bolt, pin, etc. Understandably, the housing 10 has mounting holes corresponding to the connecting holes 22b, and the fastener 50 also passes through the mounting holes. Generally, the edge rib 22a is recessed on the opposite side to avoid interference with the housing 10.

[0104] At this time, edge ribs 22a are arranged adjacent to the connection hole 22b. The edge ribs 22a strengthen the strength of the area around the connection hole 22b and improve the connection reliability between the box 10 and the bottom cover 20.

[0105] In some embodiments, refer to Figure 4 and Figure 5 Multiple reinforcing ribs J include edge ribs J5, which are located at the edge of the main body 21 and are recessed on a different side of the bottom cover 20 from the rolling ribs J1. The edge ribs J5 form an opening q that is open along their extension direction.

[0106] Specifically, the edge ribs J5 are set in the edge area close to the fixed edge 22 of the main body 21. Multiple edge ribs J5 can be arranged at intervals along the circumference of the main body 21. The setting of edge ribs J5 can enhance the structural strength of the edge area of ​​the main body 21 and avoid stress concentration and cracking at the corner where the main body 21 connects to the fixed edge 22.

[0107] The edge rib J5 and the rolling rib J1 have opposite concave directions. Together, they form an anti-symmetric bending moment, which reduces the warping deformation of the bottom cover 20 and improves the rigidity of the bottom cover 20.

[0108] The edge rib J5 has an open opening q. The design of the opening q can improve the flow and shrinkage of the material during the stamping process of the edge rib J5, improve the manufacturability of the edge rib J5, and reduce production defects. On the other hand, the opening q reduces the residual bending moment of the edge rib J5 after forming, avoids additional constraint forces, and reduces the warping deformation of the bottom cover 20.

[0109] In one specific embodiment, reference is made to Figure 4 and Figure 5 Edge rib J5 extends parallel to rolling rib J1. If rolling rib J1 extends along the length of battery box 100, edge rib J5 is arranged on both sides of the bottom cover 20 along that length direction and extends along that length direction. Since the concave direction of edge rib J5 and rolling rib J1 is opposite, when they extend parallel to each other, the overall cross-sectional moment of inertia of the bottom cover 20 can be maximized, significantly enhancing the bending stiffness, torsional stiffness and strength of the bottom cover 20.

[0110] Understandably, when the second guide rib J4 on the guide rib J4 is recessed toward the inside of the bottom cover 20, an opening q can also be formed at its end. This opening q also has the aforementioned beneficial effects, and at the same time, it facilitates the roller 201 to enter the guide surface m2.

[0111] In some embodiments, combined with Figure 2 , Figure 4 and Figure 5 It is understood that the bottom of the battery box 100 is provided with a limiting groove C, which is located on one side of the rolling rib J1 along its longitudinal direction. Furthermore, the limiting groove C is located on the side of the rolling rib J1 opposite to the guide rib J4. Thus, when the battery box 100 is rolled into the receiving chamber 200 from the receiving opening R, the guide rib J4 is closer to the roller 201, and the limiting groove C is farther from the roller 201. The guide rib J4 guides the battery box 100 into the receiving chamber 200. When it is rolled into the predetermined position, the limiting groove C corresponds to the limiting member 202.

[0112] As described above, in some cases, a limiting member 202 is provided inside the receiving chamber 200 of the electrical device. When the limiting member 202 is in the limiting state, it engages with the limiting groove C on the battery box 100. That is, when the battery box 100 is fully received in the receiving chamber 200, the limiting member 202 is switched to the limiting state and can engage with the limiting groove C.

[0113] This design serves two purposes: firstly, it prevents the battery pack from detaching from the housing 200; secondly, it works in conjunction with the walls of the housing 200 to limit the battery box 100 at least along the longitudinal direction of the rolling rib J1, preventing the battery pack from swaying within the housing 200. If the limiting groove C abuts against the limiting member 202 along the width direction of the rolling rib J1, the limiting member 202 can also limit the battery box 100 in that width direction.

[0114] In summary, the setting of the limiting groove C can cooperate with the limiting member 202 in the housing 200 to achieve positional constraint of the battery box 100.

[0115] As described in the above embodiments, the limiting member 202 is arranged at the receiving opening R of the receiving chamber 200. In other embodiments, a stop member (not shown) may also be configured inside the receiving chamber 200, which will block the battery box 100 when it slides into place. In this case, limiting grooves C can be provided on both opposite sides of the bottom cover 20, one of which cooperates with the stop member to limit the movement, and the other limiting groove C cooperates with the limiting member 202 to limit the movement.

[0116] In some embodiments, continue to combine Figure 2 , Figure 4 and Figure 5 It is understood that the limiting groove C includes a first groove C1 recessed into the fixed edge 22. The first groove C1 is understood to be located at the edge of the bottom cover 20 in the extending direction of the rolling rib J1. Since the thickness of the fixed edge 22 is typically designed to be small, the first groove C1 is typically provided to extend through the fixed edge 22 along the height direction Z of the battery case 100.

[0117] At this time, at least a partial limiting groove C is formed by the first groove C1 on the fixed edge 22. Since the fixed edge 22 is located at the bottom of the battery box 100 and the first groove C1 is located at the bottom of the battery box 100, the limiting member 202 only needs to be designed with a small height to match the first groove C1, which helps to simplify the structure of the limiting member 202 and reduce costs.

[0118] Further in the embodiments, refer to Figure 2 The housing 10 includes a flange 12 fixedly connected to the fixed edge 22. The flange 12 is folded outward. The limiting groove C also includes a second groove C2 formed inward on the flange 12. The second groove C2 and the first groove C1 are arranged opposite to each other along the height direction Z.

[0119] The flange 12 is generally horizontally positioned, horizontally opposite to the fixed edge 22. A seal can be placed between them to seal the battery box 100. The width of the flange 12 is usually the same as the width of the fixed edge 22. For ease of processing, a second groove C2 extends through the flange 12 along the height Z direction of the battery box 100. It is opposite to and communicates with the first groove C1, together forming a limiting groove C.

[0120] When the limiting member 202 is engaged in the limiting groove C, it inserts into the first groove C1 and the second groove C2 along the height direction Z of the battery box 100. In this way, the limiting groove C has higher structural strength and more reliable limiting.

[0121] It is worth noting that, for the various types of reinforcing ribs J mentioned above, if the reinforcing ribs J intersect or connect, the intersection and connection points are all rounded to reduce stress concentration.

[0122] In some embodiments, refer to Figure 2 and Figure 3 The battery box 100 also includes a top cover 30, which is open at both ends in the height direction Z of the battery box 100. The top cover 30 closes on the upper open end of the box body 10, and the bottom cover 20 closes on the lower open end of the box body 10. In another embodiment, referring to... Figure 2 and Figure 3 A lifting component 40 is provided on the housing 10. The lifting component 40 is used by the lifting device to suspend the battery box 100, facilitating the transfer of the battery box 100. Optionally, the lifting component 40 is located at a corner of the housing 10. The specific structure of the lifting component 40 is not limited here.

[0123] In one embodiment of this application, the bottom cover 20 includes a main body 21 and a fixed edge 22. The main body 21 is provided with the aforementioned rolling ribs J1, reinforcing ribs J3, auxiliary ribs J2, and edge ribs J5. The fixed edge 22 is provided with the aforementioned edge rib 22a. Multiple rolling ribs J1 are arranged parallel to and spaced apart along the length X of the battery box 100, and multiple reinforcing ribs J3 are arranged parallel to and spaced apart along the width Y of the battery box 100, all perpendicularly intersecting each rolling rib J1 and extending to the edge of the main body 21. Each rolling rib J1 has multiple auxiliary ribs J2 symmetrically arranged on both sides in its width direction. The auxiliary ribs J2 are located at the intersection of the bottom wall b1 and the side wall b2 of the rolling rib J1, and are recessed in the opposite direction to the rolling rib J1. At least one end of the rolling rib J1 is provided with the aforementioned guide rib J4, and a stepped guide surface m2 is formed on the guide rib J4, which is connected to the rolling surface m1 on the rolling rib J1. Edge ribs J5 are provided on both sides of the main body 21 in the above-mentioned length direction Y, and have an opening q that is opposite to the opening of the rolling rib J1. Guide ribs J4 also form an opening q that is opposite to the opening of the rolling rib J1.

[0124] The battery pack and power supply device in this application embodiment include all the beneficial effects of the above embodiments.

[0125] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0126] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery box (100), characterized in that, include: Box (10); The bottom cover (20) is located at one end of the box body (10) along the height direction (Z) of the battery box (100). The bottom cover (20) is provided with a plurality of reinforcing ribs (J) recessed on one side and protruding towards the other side. The plurality of reinforcing ribs (J) include rolling ribs (J1), the plurality of rolling ribs (J1) extend longitudinally in the same direction and are recessed on the same side of the bottom cover (20), and the outer surface of the bottom wall (b1) of each rolling rib (J1) forms a rolling surface (m1) for the roller (201) to roll. The plurality of reinforcing ribs (J) include auxiliary ribs (J2), the auxiliary ribs (J2) and the rolling ribs (J1) are recessed on different sides of the bottom cover (20), each of the rolling ribs (J1) includes two opposite sidewalls (b2) that intersect and connect with the bottom wall (b1), the auxiliary ribs (J2) are disposed at the intersection of the bottom wall (b1) and the sidewalls (b2), and the plurality of auxiliary ribs (J2) are spaced apart along the longitudinal direction of the rolling ribs (J1); The plurality of reinforcing ribs (J) include a reinforcing rib (J3), which is recessed on the same side of the bottom cover (20) as the rolling rib (J1), and the reinforcing rib (J3) intersects with the rolling rib (J1); the recess depth (w1) of the rolling rib (J1) is greater than or equal to the recess depth (w2) of the reinforcing rib (J3).

2. The battery box (100) according to claim 1, characterized in that, Each of the rolling ribs (J1) is recessed on the side opposite to the box body (10).

3. The battery box (100) according to claim 2, characterized in that, The plurality of reinforcing ribs (J) include the auxiliary ribs (J2) and the reinforcing ribs (J3), and there are instances where the auxiliary ribs (J2) and the reinforcing ribs (J3) intersect.

4. The battery box (100) according to claim 1, characterized in that, The plurality of reinforcing ribs (J) also include guide ribs (J4); the guide ribs (J4) are connected to one end of the rolling ribs (J1) and extend longitudinally in the same direction as the rolling ribs (J1); the outer surface of the bottom wall (b1) of the guide ribs (J4) forms a guide surface (m2) for guiding the roller (201) into the rolling surface (m1); The distance (h) between the guide surface (m2) and the rolling surface (m1) in the height direction (Z) of the battery box (100) decreases along the longitudinal direction of the guide rib (J4) toward the side where the rolling rib (J1) is located.

5. The battery box (100) according to claim 4, characterized in that, The guide rib (J4) includes multiple guide segments (J41), and each guide segment (J41) is arranged sequentially along the longitudinal direction of the guide rib (J4); the outer surface of all the guide segments (J41) constitutes the guide surface (m2), and the closer to the rolling rib (J1), the smaller the interval (h) between the outer surface of the guide segment (J41) and the rolling surface (m1); The guide rib (J4) includes a first guide segment (J41a) and a second guide segment (J41b), wherein the first guide segment (J41a) is connected between the second guide segment (J41b) and the rolling rib (J1), wherein: The first guide segment (J41a) is recessed in the same direction as the rolling rib (J1), and the second guide segment (J41b) is recessed in the opposite direction to the rolling rib (J1); and / or, the recess depth (w3) of the first guide segment (J41a) is greater than the recess depth (w4) of the second guide segment (J41b), and the recess width (d1) of the first guide segment (J41a) is greater than the recess width (d2) of the second guide segment (J41b).

6. The battery box (100) according to claim 1, characterized in that, The bottom cover (20) includes a main body (21) and a fixed edge (22). The fixed edge (22) is arranged around the main body (21). The main body (21) protrudes away from the box body (10) relative to the fixed edge (22). The reinforcing rib (J) is arranged on the main body (21). The fixed edge (22) is fixedly connected to the box body (10).

7. The battery box (100) according to claim 6, characterized in that, The fixed edge (22) is provided with an edge rib (22a), the edge rib (22a) being recessed into one side of the fixed edge (22) and protruding towards the other side. The fixed edge (22) is provided with a connecting hole (22b). The housing (10) is fastened to the fixed edge (22) by a fastener (50), the fastener (50) passing through the connecting hole (22b). The edge rib (22a) is arranged adjacent to the connecting hole (22b); and / or, The plurality of reinforcing ribs (J) include edge ribs (J5), which are located at the edge of the body (21) and recessed on a different side of the bottom cover (20) from the rolling ribs (J1), and the edge ribs form an opening (q) that is open along their extension direction.

8. The battery box (100) according to claim 6, characterized in that, The bottom of the battery box (100) is provided with a limiting groove (C), which is located on one side of the rolling rib (J1) in the longitudinal direction; The limiting groove (C) includes a first groove (C1) recessed into the fixed edge (22); The housing (10) includes a flange (12) fixedly connected to the fixed edge (22), the flange (12) is folded outward toward the housing (10), and the limiting groove (C) also includes a second groove (C2) formed inward in the flange (12), the second groove (C2) and the first groove (C1) are arranged opposite to each other along the height direction (Z).

9. A battery pack, characterized in that, It includes a battery cell and a battery case (100) as described in any one of claims 1-8, wherein the battery cell is disposed within the battery case (100).

10. An electrical device, characterized in that, The device includes a housing (200) and a battery pack as described in claim 9. The inner bottom wall of the housing (200) is provided with a roller (201), and the side wall of the housing (200) is provided with a receiving opening (R). The battery pack is slidably supported on the roller (201) by the rolling surface (m1) so as to be slidably received in the housing (200) through the receiving opening (R).

11. The electrical appliance according to claim 10, characterized in that, A limiting member (202) is provided on the inner bottom wall of the containment chamber (200). The limiting member (202) is located at the containment opening (R) of the containment chamber (200). The limiting member (202) is controllable to switch between a limiting state and an avoidance state. When in the avoidance state, the limiting member (202) allows the battery pack to enter the containment chamber (200) through the containment opening (R). When in the limiting state, the limiting member (202) is limited and engaged with the limiting groove (C) on the battery box (100).

Images