Box body structure, battery pack and electric device

Abstract

The utility model provides a box body structure, a battery pack and an electric device. The box structure comprises side plates, a bottom plate and a structural plate. And the side plates and the bottom plate form an accommodating cavity for accommodating the battery module. The bottom plate is a profile plate with an internal space, and a plurality of reinforcing ribs are arranged in the internal space. And the internal space is divided into a plurality of cavities by the plurality of reinforcing ribs. The reinforcing ribs are used for improving the structural strength of the bottom plate. And the cavity is used for circulating condensed water and adjusting the temperature of the battery module. The bottom plate comprises a first face and a second face which are oppositely arranged. The first surface is in contact with the battery module, and the second surface is connected with a battery rack of the electric device. And the structural plate is connected with the second surface, is arranged between the second surface and the battery rack, and is used for improving the structural strength of the bottom plate and avoiding the stress concentration problem of the box body structure or the battery cell shell caused by long-term vibration of the electric device, so that the service life of the battery is prolonged, and the normal use of the electric device is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a box structure, a battery pack and an electric device. BACKGROUND

[0002] The electric device is subjected to long-term vibration in a harsh use environment. The battery pack is connected to the electric device through a bottom plate, the bottom plate is part of the box structure, and the battery cell is fixed in the box structure through the battery cell shell. Therefore, the vibration of the electric device is transmitted to the box structure through the bottom plate and finally transmitted to the battery cell shell.

[0003] The structure strength of the bottom plate in the related art is insufficient, which may cause stress concentration of the box structure or the battery cell shell, thereby causing the box structure or the battery cell shell to be damaged to different degrees, affecting the service life of the battery, and affecting the normal use of the electric device. Utility model content

[0004] The present application provides a box structure, a battery pack and an electric device, which improves the structure strength of the bottom plate, thereby avoiding the stress concentration problem of the box structure or the battery cell shell caused by the long-term vibration of the electric device, thereby prolonging the service life of the battery and ensuring the normal use of the electric device.

[0005] In a first aspect, the present application provides a box structure, comprising: a side plate, a bottom plate and a structure plate. The side plate and the bottom plate form a containing cavity for containing a battery module. The bottom plate is a profiled plate with an internal space, and a plurality of reinforcing ribs are arranged in the internal space. The plurality of reinforcing ribs divide the internal space into a plurality of cavities. The reinforcing ribs are used to improve the structure strength of the bottom plate. The cavities are used to circulate condensed water. The bottom plate comprises a first surface and a second surface arranged opposite to each other. The first surface is in contact with the battery module, and the second surface is connected to a battery rack of the electric device. The structure plate is connected to the second surface and arranged between the second surface and the battery rack, and is used to improve the structure strength of the bottom plate.

[0006] According to the first aspect, the box structure comprises a side plate, a bottom plate and a structure plate. The containing cavity formed by the side plate and the bottom plate is used to contain and protect the battery module. The bottom plate is a profiled plate with a plurality of reinforcing ribs arranged in the internal space, which improves the structure strength of the bottom plate and enables the bottom plate to be used to adjust the temperature of the battery module. The structure plate is connected to the second surface of the bottom plate and arranged between the second surface and the battery rack, so that the structure plate shares the stress generated by the vibration of the bottom plate, further improves the structure strength of the bottom plate, avoids the stress concentration problem of the box structure or the battery cell shell caused by the long-term vibration of the electric device, thereby prolonging the service life of the battery and ensuring the normal use of the electric device.

[0007] In a possible design, a plurality of first connecting holes are formed on the reinforcing rib, and a plurality of second connecting holes are formed on the structural plate. A connecting piece is arranged in the first connecting hole and the second connecting hole, to fix the positions of the reinforcing rib and the structural plate, and to connect the structural plate to the bottom plate.

[0008] Based on the description of the above embodiment, the reinforcing rib is provided with a plurality of first connecting holes, and the bottom plate is provided with a plurality of second connecting holes, so that the bottom plate and the structural plate are connected through a plurality of connecting pieces, the connecting strength between the bottom plate and the structural plate is improved, and the structural strength of the bottom plate is further improved, thereby avoiding the stress concentration problem of the box structure or the battery shell caused by the long-term vibration of the electric device.

[0009] In a possible design, the number of connecting pieces is greater than or equal to 27.

[0010] Based on the description of the above embodiment, when the number of connecting pieces is greater than or equal to 27, the connecting strength between the bottom plate and the structural plate can be ensured to be sufficient, so that the structural strength of the bottom plate is ensured, and the stress concentration problem of the box structure or the battery shell caused by the long-term vibration of the electric device is avoided.

[0011] In a possible design, the cross section of the reinforcing rib is triangular. The triangular shape includes a first side, a second side, and a third side. The first side is close to the structural plate. The first connecting hole is formed on the first side. The length of the first side is greater than the length of the second side or the length of the third side.

[0012] Based on the description of the above embodiment, the cross section of the reinforcing rib is triangular, the flow of the condensed water in the cavity is increased, and the effect of the condensed water in the bottom plate on adjusting the temperature of the battery module is optimized. The first connecting hole is formed on the first side with the longest length in the triangular shape, so that the first connecting hole has sufficient space for formation, the reliability of the connection between the first connecting hole and the connecting piece is ensured, and the connecting strength between the reinforcing rib and the bottom plate is ensured.

[0013] In a possible design, the structural plate can be bent into a W shape, so that the structural plate includes three convex surfaces, two concave surfaces, and four support surfaces. The three convex surfaces and the two concave surfaces are parallel to the second surface, and the convex surfaces are connected to the second surface. There is a distance between the convex surface and the concave surface in the height direction of the box structure. Each support surface is connected between a convex surface and a concave surface, so that there is an included angle between the support surface and the convex surface, and there is also an included angle between the support surface and the concave surface.

[0014] Based on the description of the above embodiment, the structural plate is bent into a W shape, so that the structural plate includes three convex surfaces connected to the second surface, two concave surfaces, and four support surfaces for supporting the structural plate, the connecting strength between the structural plate and the bottom plate is improved, and the structural strength of the bottom plate is further improved.

[0015] In a possible design, the bottom plate is provided with a plurality of first fixing points along the length direction of the box structure. The second surface is connected with a plurality of structure plates along the length direction of the box structure. Each structure plate is provided with a plurality of second fixing points, and each of the plurality of second fixing points corresponds to one of the plurality of first fixing points. The box structure is connected with the battery rack through the plurality of first fixing points and the plurality of second fixing points.

[0016] Based on the description of the above embodiment, the bottom plate is provided with a plurality of first fixing points along the length direction of the box structure. The second surface is connected with a plurality of structure plates along the length direction of the box structure. Each structure plate is provided with a plurality of second fixing points, and each of the plurality of second fixing points corresponds to one of the plurality of first fixing points. The box structure is connected with the battery rack through the plurality of first fixing points and the plurality of second fixing points, so that the structure plates share the stress borne by the bottom plate at the plurality of fixing points, thereby preventing the bottom plate from being damaged due to excessive stress borne at the fixing points.

[0017] In a possible design, the connecting member includes first connecting members close to the second fixing points and second connecting members arranged at other positions of the structure plate. The ratio of the number of the first connecting members to the number of the second connecting members is 2:3.

[0018] Based on the description of the above embodiment, when the ratio of the number of the first connecting members to the number of the second connecting members is 2:3, the structural strength at the second fixing points can be improved, the structure plate can be prevented from being damaged due to stress concentration, and the structural strength of the bottom plate is further ensured.

[0019] In a possible design, the two concave surfaces and the four supporting surfaces form two grooves, and the grooves are provided with pads. The second fixing points are arranged on the pads.

[0020] Based on the description of the above embodiment, the two concave surfaces and the four supporting surfaces form two grooves, and the second fixing points are arranged on the pads arranged in the grooves, so that the structural strength of the grooves is improved, the structural strength of the structure plate is ensured, and the structural strength of the bottom plate is further ensured.

[0021] In a second aspect, the application provides a battery pack, including a battery module and the box structure in any of the above embodiments. The battery module is placed in the box structure. The box structure is used to protect the battery module.

[0022] In a third aspect, the application provides a power consumption device, including a device circuit, a battery rack, and the battery pack in the above embodiments. The box structure in the battery pack is mounted on the battery rack. The battery module in the battery pack is connected with the device circuit, so as to provide power for the power consumption device.

[0023] The battery pack provided in the second aspect and the power utilization device provided in the third aspect have the beneficial effects of the first aspect and the possible implementation manners of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0025] Figure 1 A structural schematic diagram of a battery pack in the embodiments of the present application.

[0026] Figure 2 A structural schematic diagram of a box structure in the embodiments of the present application.

[0027] Figure 3 A structural schematic diagram of a box structure in the embodiments of the present application. Figure 2 A sectional view along the A-A direction.

[0028] Figure 4 A structural schematic diagram of a structural plate and a bottom plate in the embodiments of the present application.

[0029] Figure 5 A structural schematic diagram of a structural plate in the embodiments of the present application. Figure 2 A sectional view along the B-B direction.

[0030] Figure 6 A structural schematic diagram of a structural plate in the embodiments of the present application.

[0031] Figure 7 A structural schematic diagram of a structural plate in the embodiments of the present application. Figure 6 A view from another perspective.

[0032] Explanation of reference signs:

[0033] 100 - battery pack;

[0034] 10 - box structure;

[0035] 1 - side plate;

[0036] 2 - bottom plate; 21 - reinforcing rib; 22 - cavity; 2a - first surface; 2b - second surface; 23 - first fixing point;

[0037] 3 - structural plate; 31 - second connecting hole; 32 - convex surface; 33 - concave surface; 34 - supporting surface; 35 - second fixing point; 36 - groove;

[0038] 4 - connecting piece;

[0039] 5 - spacer;

[0040] 20 - battery module. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing the specific embodiments only and is not intended to be limiting of the application.

[0043] The terms "comprise", "have" and any variations thereof in the specification and claims of the present application and the terms "comprise", "have" and any variations thereof in the description of the drawings mean to encompass but not exclude other features. The word "a" or "an" does not exclude a plurality.

[0044] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the features, structures, or characteristics described in connection with an embodiment can be included in at least one implementation of the application.

[0045] The term "and / or" in the present document is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present document generally represents an "or" relationship between the front and rear associated objects.

[0046] The positional words appearing in the following description are the directions shown in the drawings, and are not intended to limit the specific structure of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only intended to facilitate the description of the present application and simplify the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0047] In addition, the expressions of the indicated directions for describing the operation and structure of each member of the present embodiment, such as the X direction, the Y direction, and the Z direction, are not absolute but relative, and although these indications are appropriate when each member is in the position shown in the drawings, these directions should be interpreted differently to correspond to the changes when these positions are changed.

[0048] In addition, the terms "first", "second", and the like in the specification and claims of the present application or the above drawings are used to distinguish different objects, and are not intended to describe a particular order, and can explicitly or implicitly include one or more of the features.

[0049] In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more (including two), and similarly, "a plurality of groups" means two or more groups (including two groups).

[0050] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, the "connection" or "connection" of the mechanical structure can mean a physical connection, for example, the physical connection can be a fixed connection, for example, a fixed connection by a fixing member, for example, a fixed connection by a screw, bolt or other fixing member; the physical connection can also be a detachable connection, for example, a mutual clamping or clamping connection; the physical connection can also be integrally connected, for example, connected by welding, bonding or integrally formed; the "connection" or "connection" of the circuit structure can mean a physical connection, an electrical connection or a signal connection, for example, it can be directly connected, that is, a physical connection, or indirectly connected through at least one intermediate element, as long as the circuit is connected, it can also be the connection between two elements; signal connection, in addition to signal connection through the circuit, can also mean signal connection through media medium, for example, radio waves. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] Electrical appliances refer to electrical devices that use electrical energy to perform specific functions. Electrical appliances can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric vehicles can include electric commercial vehicles, electric passenger vehicles, electric buses, and electric heavy trucks. These devices are powered by battery packs to provide various functions or services.

[0052] When the aforementioned electric buses or electric heavy trucks are used in harsh road conditions such as mines, the vehicle body will experience prolonged vibration. The battery pack is connected to the vehicle body via a base plate, which is part of the enclosure structure. The battery cells of the battery pack are fixed within the enclosure structure via cell housings. Therefore, the vibration of the vehicle body is transmitted through the base plate to the enclosure structure and ultimately to the cell housings.

[0053] Insufficient structural strength of the base plate in related technologies can cause stress concentration in the casing structure or the cell casing, resulting in varying degrees of damage to the casing structure or the cell casing, affecting battery life and the normal use of electrical devices.

[0054] Based on this, this application provides a housing structure, a battery pack, and an electrical device. By setting a structural plate on the base plate, the structural strength of the base plate is improved, thereby avoiding stress concentration problems caused by long-term vibration of the housing structure or battery cell casing due to the electrical device, thus extending battery life and ensuring the normal use of the electrical device. The following is in conjunction with... Figures 1-7 Please provide a detailed explanation.

[0055] Firstly, such as Figures 1-3 As shown, this application provides a housing structure 10, including: a side plate 1, a bottom plate 2, and a structural plate 3. The side plate 1 and the bottom plate 2 form a receiving cavity for accommodating a battery module 20. The bottom plate 2 is a profile plate with an internal space, in which multiple reinforcing ribs 21 are provided. The multiple reinforcing ribs 21 divide the internal space into multiple cavities 22. The reinforcing ribs 21 are used to improve the structural strength of the bottom plate 2. The cavities 22 are used for the flow of condensate. The bottom plate 2 includes a first surface 2a and a second surface 2b disposed opposite to each other. The first surface 2a contacts the battery module 20, and the second surface 2b is connected to the battery rack (not shown) of the power device. The structural plate 3 is connected to the second surface 2b and is disposed between the second surface 2b and the battery rack to improve the structural strength of the bottom plate 2.

[0056] The housing structure 10 may include multiple side plates 1 and a bottom plate 2. The bottom plate 2 includes a first surface 2a and a second surface 2b arranged opposite to each other. The first surface 2a contacts the battery module 20, and the second surface 2b is connected to the battery rack of the power-consuming device, so that the battery pack 100 is installed inside the power-consuming device and can provide power to the power-consuming device.

[0057] Further, the number of side plates 1 is the same as the number of edges of the bottom plate 2. For example, as shown in FIG. 1, the bottom plate 2 is a rectangular plate having four edges. Then the number of side plates 1 is four, and the four side plates 1 are respectively connected to the four edges of the bottom plate 2 to form a housing structure having a containing cavity with the bottom plate 2. The side plates 1 and the bottom plate 2 are made of materials with high structural strength, and the battery module 20 is placed in the containing cavity, so that the housing structure is used to protect the battery module 20 from damage due to external bumps or vibrations. Figure 1

[0058] In the battery module 20, a plurality of battery cells are included. Each battery cell includes a battery core and a battery core shell wrapped outside the battery core. The battery core shell is used to protect the battery core from leakage.

[0059] In the battery module 20, a plurality of battery cells are included. Each battery cell includes a battery core and a battery core shell wrapped outside the battery core. The battery core shell is used to protect the battery core from leakage. Figure 2 Figure 3 As shown in FIG. 2, the bottom plate 2 is a profiled plate having an internal space, and a plurality of barrier structures are arranged in the internal space. The barrier structures are used to divide the internal space into a plurality of cavities 22. When the battery module 20 is placed in the containing cavity, the bottom of the battery module 20 is in contact with the bottom plate 2. At this time, the condensed water flows in the cavities 22, which can play a role in adjusting the temperature of the battery module 20 to ensure that the battery module 20 can be charged and discharged in a suitable temperature environment.

[0060] Further, as shown in FIG. 3, the barrier structures can be reinforcing ribs 21, which can improve the structural strength of the bottom plate 2 while dividing the cavities 22. Figure 3 In order to further improve the structural strength of the bottom plate 2, as shown in FIG. 4 and FIG. 5, a structural plate 3 can be arranged on the bottom plate 2, and the structural plate 3 is connected to the second surface 2b. Moreover, the structural plate 3 is arranged between the bottom plate 2 and the battery rack, so that the vibration of the electrical device caused by the external environment is transmitted to the structural plate 3 and then to the bottom plate 2, and the structural plate 3 shares the stress of the bottom plate 2 caused by the vibration, thereby improving the structural strength of the bottom plate 2 and avoiding the problem of stress concentration of the box structure 10 or the battery core shell caused by the long-term vibration of the electrical device.

[0061] Figure 3 Specifically, the bottom plate 2 can be made of aluminum alloy, and the structural plate 3 can be made of steel. Both aluminum alloy and steel are high-strength materials, which further improve the structural strength of the bottom plate 2. Moreover, aluminum alloy also has good thermal conductivity, which is conducive to the temperature exchange between the condensed water in the bottom plate 2 and the battery module 20, thereby achieving the function of adjusting the temperature. Figure 4

[0062]

[0063] ​​​​​In summary, the box structure 10 provided by the application comprises a side plate 1, a bottom plate 2 and a structure plate 3. The accommodating cavity formed by the side plate 1 and the bottom plate 2 is used for accommodating and protecting the battery module 20. The bottom plate 2 is a profiled plate provided with a plurality of reinforcing ribs 21 for the inner space, which improves the structural strength of the bottom plate 2 and enables the bottom plate 2 to be used for adjusting the temperature of the battery module 20. The structure plate 3 is connected to the second face 2b of the bottom plate 2 and is arranged between the second face 2b and the battery rack, so that the structure plate 3 shares the stress generated by the vibration of the bottom plate 2, further improves the structural strength of the bottom plate 2, avoids the stress concentration problem of the box structure 10 or the battery cell shell caused by the long-term vibration of the electric device, thereby prolongs the service life of the battery and ensures the normal use of the electric device.

[0064] Further, the connection strength between the bottom plate 2 and the structure plate 3 is also one of the factors that determine the structural strength of the bottom plate 2, so the application further describes the connection relationship between the bottom plate 2 and the structure plate 3.

[0065] In some embodiments, as shown in Figs. 1 and 2, a plurality of first connecting holes (not shown in the figure) are formed on the reinforcing rib 21, and a plurality of second connecting holes 31 are formed on the structure plate 3. Figure 5 Figure 6 As shown in Figs. 1 and 2, a connecting piece 4 is arranged in the first connecting hole and the second connecting hole 31, which is used for fixing the positions of the reinforcing rib 21 and the structure plate 3 and connecting the structure plate 3 to the bottom plate 2.

[0066] The connecting piece 4 can include but is not limited to a bolt or a rivet. When the connecting piece 4 is a bolt, the first connecting hole and the second connecting hole 31 are provided with internal threads, so that the bolt is tightened in the first connecting hole and the second connecting hole 31.

[0067] Since the bottom plate 2 comprises the reinforcing rib 21 and the cavity 22, the reinforcing rib 21 is a solid structure and the cavity 22 is a hollow structure, so the first connecting hole is formed on the reinforcing rib 21, which can ensure the reliability of the connection of the connecting piece 4.

[0068] Further, one first connecting hole corresponds to one second connecting hole 31, and a plurality of first connecting holes are formed on the reinforcing rib 21, so a plurality of second connecting holes 31 are formed on the structure plate 3. Correspondingly, a plurality of connecting pieces 4 are needed, and the number of the connecting pieces 4 is the same as the number of the first connecting holes.

[0069] In summary, a plurality of first connecting holes are formed on the reinforcing rib 21, and a plurality of second connecting holes 31 are formed on the bottom plate 2, so that the bottom plate 2 and the structure plate 3 are connected through a plurality of connecting pieces 4, which improves the connection strength between the bottom plate 2 and the structure plate 3, further improves the structural strength of the bottom plate 2, and avoids the stress concentration problem of the box structure 10 or the battery cell shell caused by the long-term vibration of the electric device.

[0070] ​Furthermore, considering the damage to the connector 4 caused by vibration, a sufficient number of connectors 4 are needed between the base plate 2 and the structural plate 3 to ensure the connection strength between the base plate 2 and the structural plate 3.

[0071] Based on this, in some embodiments, the number of connectors 4 is greater than or equal to 27.

[0072] According to the description of the above embodiments, when the number of connectors 4 is greater than or equal to 27, it can ensure that there is sufficient connection strength between the base plate 2 and the structural plate 3, thereby ensuring the structural strength of the base plate 2 and avoiding stress concentration problems caused by long-term vibration of the box structure 10 or the battery cell housing due to the electrical device.

[0073] Furthermore, the enclosure structure 10 is fixed to the battery rack via the base plate 2. To ensure the reliability of the connection between the enclosure structure 10 and the battery rack, multiple fixing points are provided between the base plate 2 and the battery rack. Fixing elements are provided at these fixing points to connect the base plate 2 and the battery rack. For example, there are three sets of fixing points between the base plate 2 and the battery rack, each set including two fixing points symmetrically distributed along the width direction of the enclosure structure 10. The three sets of fixing points are evenly distributed along the length direction of the enclosure structure 10. For example, two sets of fixing points are respectively located at both ends along the length direction of the enclosure structure 10, and the third set of fixing points is located between the two sets of fixing points.

[0074] Based on the above, it can be seen that the base plate 2 is connected to the battery rack at multiple fixing points via fasteners. Therefore, it can be concluded that vibrations from the electrical device are directly transmitted to the base plate 2 through these fasteners. Consequently, the base plate 2 experiences the greatest stress at these fixing points.

[0075] To prevent excessive stress on the base plate 2 at the fixing point from causing damage to the base plate 2, the following improvements can be made in this application:

[0076] In some embodiments, such as Figure 4 As shown, multiple sets of first fixing points 23 are provided on the base plate 2 along the length of the housing structure 10. Multiple structural plates 3 are connected on the second surface 2b along the length of the housing structure 10. Each structural plate 3 is provided with a set of second fixing points 35, so that the set of second fixing points 35 corresponds to the set of first fixing points 23. The housing structure 10 is connected to the battery rack through the multiple sets of first fixing points 23 and the multiple sets of second fixing points 35.

[0077] The bottom plate 2 is provided with a plurality of groups of first fixing points 23. The structural plate 3 is provided with a group of second fixing points 35. Among them, the number of structural plates 3 is the same as the number of groups of first fixing points 23. And the plurality of groups of fixing points on the bottom plate 2 are arranged along the length direction of the box body, and the plurality of structural plates 3 are also connected to the second surface 2b along the length direction of the box structure 10, so that each group of second fixing points 35 on the structural plate 3 corresponds to a group of first fixing points 23 on the bottom plate 2. For example, the bottom plate 2 is provided with three groups of fixing points along the length direction of the box body. Three structural plates 3 are connected to the second surface 2b along the length direction of the box body.

[0078] Specifically, the first fixing point 23 and the second fixing point 35 can be connected by a fixing member, so that the box structure 10 is connected to the battery rack through the first fixing point 23 and the second fixing point 35, so that the structural plate 3 is connected between the second surface 2b and the battery rack. At this time, the vibration received by the electric device can be transmitted to the structural plate 3 through the second fixing point 35, so that the structural plate 3 shares the stress received by the bottom plate 2 at the fixing point, thereby preventing the bottom plate 2 from being damaged due to excessive stress received at the fixing point. For example, the fixing member is a bolt, and the first fixing point 23 and the second fixing point 35 can be threaded holes, and the bolt is tightened in the first threaded hole and the second threaded hole to fix the bottom plate 2 and the structural plate 3 on the battery rack.

[0079] In summary, a plurality of groups of first fixing points 23 are arranged on the bottom plate 2 along the length direction of the box structure 10. A plurality of structural plates 3 are arranged along the length direction of the box structure 10, and a group of second fixing points 35 is arranged on each structural plate 3, so that a group of second fixing points 35 corresponds to a group of first fixing points 23. The box structure 10 is connected to the battery rack through the plurality of groups of first fixing points 23 and the plurality of groups of second fixing points 35, so that the structural plate 3 shares the stress received by the bottom plate 2 at the plurality of fixing points, thereby preventing the bottom plate 2 from being damaged due to excessive stress received at the fixing point.

[0080] Further, according to the above content, the structural plate 3 shares the stress received by the bottom plate 2 at the second fixing point 35. Therefore, in order to improve the structural strength of the structural plate 3, the distribution of the connecting member 4 on the structural plate 3 is further improved as follows:

[0081] Based on this, in some embodiments, the connecting member 4 includes a first connecting member close to the second fixing point 35 and a second connecting member arranged at other positions of the structural plate 3. Among them, the ratio of the number of first connecting members to the number of second connecting members is 2:3.

[0082] In order to distinguish the connecting member 4 close to the second fixing point 35 and the connecting member 4 arranged at other positions of the structural plate 3, the connecting member 4 arranged at the second fixing point 35 can be called the first connecting member, and the connecting member 4 arranged at other positions of the structural plate 3 can be called the second connecting member.

[0083] According to the above, the box structure 10 is connected with the battery rack through the second fixing point 35, so that the second fixing point 35 of the structure plate 3 shares the stress. Therefore, the number of the first connecting pieces needs to be greater than the number of the second connecting pieces, so as to improve the structural strength of the second fixing point 35, thereby ensuring the structural strength of the structure plate 3 as a whole and preventing the structure plate 3 from being damaged due to stress concentration.

[0084] Through a large number of experiments and calculations, it can be concluded that when the ratio of the number of the first connecting pieces to the number of the second connecting pieces is 2:3, the structural strength of the second fixing point 35 can be improved, the structure plate 3 can be prevented from being damaged due to stress concentration, and the structural strength of the bottom plate 2 can be further ensured.

[0085] Specifically, the first connecting piece close to the second fixing point 35 can be understood as a connecting piece 4 falling within a predetermined range. For example, the predetermined range can be a circular range with the second fixing point 35 as the center and 120 mm as the radius.

[0086] In order to further improve the structural strength of the structure plate 3, the structure of the structure plate 3 can be further limited in the application:

[0087] In some embodiments, as shown in Figure 7 The structure plate 3 can be bent into a W shape, so that the structure plate 3 includes three convex surfaces 32, two concave surfaces 33 and four support surfaces 34. Among them, the three convex surfaces 32 and the two concave surfaces 33 are parallel to the second surface 2b, and the convex surface 32 is connected with the second surface 2b. There is a distance between the convex surface 32 and the concave surface 33 in the height direction of the box structure 10. Each support surface 34 is connected between a convex surface 32 and a concave surface 33, so that there is an included angle between the support surface 34 and the convex surface 32, and there is also an included angle between the support surface 34 and the concave surface 33.

[0088] Specifically, the three convex surfaces 32 can be a first convex surface, a second convex surface and a third convex surface respectively. The two concave surfaces 33 can be a first concave surface and a second concave surface respectively. The four support surfaces 34 can be a first support surface, a second support surface, a third support surface and a fourth support surface respectively.

[0089] Among them, one end of the first support surface is connected with the first convex surface, and the other end of the first support surface is connected with one end of the first concave surface. There is an included angle between the first support surface and the first convex surface, and there is also an included angle between the first support surface and the first concave surface.

[0090] One end of the second support surface is connected with the other end of the first concave surface, and the other end of the second support surface is connected with one end of the second convex surface. There is an included angle between the second support surface and the first concave surface, and there is also an included angle between the second support surface and the second convex surface.

[0091] One end of the third support surface is connected to the other end of the second convex surface, and the other end of the third support surface is connected to one end of the second concave surface. An included angle exists between the third support surface and the second convex surface, and an included angle also exists between the third support surface and the second concave surface.

[0092] One end of the fourth support surface is connected to the other end of the second concave surface, and the other end of the fourth support surface is connected to the third convex surface. An included angle exists between the fourth support surface and the second concave surface, and an included angle also exists between the fourth support surface and the third convex surface.

[0093] Further, the three convex surfaces 32 are connected to the second surface 2b, increasing the connection area of the structural plate 3 and the bottom plate 2 and improving the connection strength between the structural plate 3 and the bottom plate 2, thereby ensuring the structural strength of the bottom plate 2. Moreover, the three convex surfaces 32 are connected to the second surface 2b, increasing the connection positions of the connecting piece 4, so that the number of the connecting piece 4 can be increased, and the connection strength between the structural plate 3 and the bottom plate 2 is further improved.

[0094] Further, the four support surfaces 34 correspond to four reinforcing plates for supporting the structural plate 3, thereby strengthening the structural strength of the structural plate 3 and further strengthening the structural strength of the bottom plate 2.

[0095] According to the above description of the embodiments, the structural plate 3 is bent into a W shape, so that the structural plate 3 includes three convex surfaces 32 connected to the second surface 2b, two concave surfaces 33, and four support surfaces 34 for supporting the structural plate 3, improving the connection strength between the structural plate 3 and the bottom plate 2 and further strengthening the structural strength of the bottom plate 2.

[0096] Further, the two concave surfaces 33 and the four support surfaces 34 form two grooves 36. The second fixed points 35 are arranged in the two grooves 36, respectively. When the box structure 10 is connected to the battery rack through the second fixed points 35, the second fixed points 35 will be subjected to the fastening force from the fixing piece, so that the grooves 36 are at risk of deformation, thereby affecting the structural strength of the structural plate 3.

[0097] Based on this, the present application can also be improved as follows:

[0098] In some embodiments, as shown in Figure 6 and Figure 7 The two concave surfaces 33 and the four support surfaces 34 form two grooves 36. The grooves 36 are provided with the pads 5. The second fixed points 35 are arranged on the pads 5.

[0099] Specifically, the second fixed points 35 are arranged on the pads 5 arranged in the grooves 36, and the fastening force received by the second fixed points 35 is applied to the pads 5, reducing the stress received by the grooves 36 and improving the structural strength of the grooves 36, thereby ensuring the structural strength of the structural plate 3.

[0100] According to the description of the above embodiment, the two concave surfaces 33 and the four supporting surfaces 34 form two grooves 36, and the second fixing points 35 are arranged on the pads 5 arranged in the grooves 36, which improves the structural strength of the grooves 36, ensures the structural strength of the structural plate 3, and further ensures the structural strength of the bottom plate 2.

[0101] In order to balance the structural strength and processability of the structural plate 3, the structural plate 3 can be further improved as follows:

[0102] In some embodiments, the thickness of the structural plate 3 is greater than or equal to 2 mm. In addition, the thickness of the structural plate 3 is less than or equal to 5 mm.

[0103] Specifically, the structural plate 3 can be bent into a W shape through a bending process. Therefore, the thicker the thickness of the structural plate 3 is, the more inconvenient the bending process is.

[0104] However, the thicker the thickness of the structural plate 3 is, the better the structural strength of the structural plate 3 is. Therefore, it is necessary to make the thickness of the structural plate 3 within a suitable range, so as to make the structural plate 3 easy to process while ensuring that the structural plate 3 has high structural strength.

[0105] Therefore, the thickness of the structural plate 3 is greater than or equal to 2 mm and less than or equal to 5 mm. In this way, the structural plate 3 is easy to process while ensuring that the structural plate 3 has high structural strength.

[0106] Further, considering the connection strength between the structural plate 3 and the bottom plate 2 and the effect of the condensed water on the temperature of the battery cell module in the bottom plate 2, the structure of the reinforcing rib 21 can be further improved as follows:

[0107] In some embodiments, as shown in Figure 3 and Figure 5 The cross section of the reinforcing rib 21 is triangular. The triangle includes a first side, a second side, and a third side. The first side is close to the structural plate 3. The first connecting hole is arranged on the first side. The length of the first side is greater than the length of the second side or the length of the third side.

[0108] The first connecting hole is arranged on the first side, and the first side is the longest side in the triangle, so that the first connecting hole has sufficient space to be arranged, which ensures the reliability of the connection between the first connecting hole and the connecting piece 4, thereby ensuring the connection strength between the reinforcing rib 21 and the bottom plate 2.

[0109] In addition, when the first side is determined as the first length, the cross section of the reinforcing rib 21 can be a rectangle with the longest side being the first length, or a triangle with the longest side being the first length. Among them, compared with the cross section of the reinforcing rib 21 being a rectangle, the reinforcing rib 21 with the cross section being a triangle has a larger cross-sectional area of the cavity 22 blocked in the bottom plate 2, which increases the flow of condensed water in the cavity 22, thereby optimizing the effect of the condensed water in the bottom plate 2 on adjusting the temperature of the battery cell module.

[0110] It should be noted that the cross section refers to the cross section of the reinforcing rib 21 along the width direction of the box structure 10.

[0111] According to the description of the above embodiment, the cross section of the reinforcing rib 21 is a triangle, which increases the flow of condensed water in the cavity 22, thereby optimizing the effect of the condensed water in the bottom plate 2 on adjusting the temperature of the battery cell module. The first connecting hole is arranged on the first side with the longest length in the triangle, so that the first connecting hole has sufficient space for arrangement, thereby ensuring the reliability of the connection between the first connecting hole and the connecting piece 4, and ensuring the connection strength between the reinforcing rib 21 and the bottom plate 2.

[0112] In a second aspect, the application provides a battery pack, comprising a battery module and the box structure according to any one of the above embodiments. The battery module is placed in the box structure. The box structure is used to protect the battery module.

[0113] In a third aspect, the application provides a power consumption device, comprising a device circuit, a battery holder and the battery pack according to the above embodiments. The box structure in the battery pack is mounted on the battery holder. The battery module in the battery pack is connected with the device circuit, thereby providing power for the power consumption device.

[0114] Those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means to be within the scope of the application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0115] The above embodiments are only used to illustrate the technical solutions of the application, but not limit the application; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A box structure, characterized by, The application relates to a battery module box structure. The battery module box structure comprises side plates, a bottom plate and a structure plate. The side plates and the bottom plate form a containing cavity for containing a battery module. The bottom plate is a profiled plate with an internal space, and a plurality of reinforcing ribs are arranged in the internal space. The reinforcing ribs divide the internal space into a plurality of profiled cavities. The reinforcing ribs are used for improving the structural strength of the bottom plate. The profiled cavities are used for circulating condensed water. The bottom plate comprises a first surface and a second surface arranged oppositely. The first surface is in contact with the battery module, and the second surface is connected with a battery holder of an electric device. The structure plate is connected with the second surface, and the structure plate is arranged between the second surface and the battery holder, and is used for improving the structural strength of the bottom plate.

2. The box structure of claim 1, wherein A plurality of first connecting holes are arranged on the reinforcing ribs. A plurality of second connecting holes are arranged on the structure plate. Connecting pieces are arranged in the first connecting holes and the second connecting holes, and are used for fixing the positions of the reinforcing ribs and the structure plate, and connecting the structure plate on the bottom plate.

3. The box structure of claim 2, wherein, The number of the connecting pieces is greater than or equal to 27.

4. The box structure of claim 2, wherein The cross section of the reinforcing rib is triangular. The triangular shape comprises a first side, a second side and a third side. The first side is close to the structure plate. The first connecting hole is arranged on the first side. The length of the first side is greater than the lengths of the second side and the third side.

5. A box structure according to any one of claims 2-4, characterized in that, The structure plate can be bent into a W shape, and the structure plate comprises three convex surfaces, two concave surfaces and four supporting surfaces. The three convex surfaces and the two concave surfaces are parallel to the second surface, and the convex surfaces are connected with the second surface. There is a distance between the convex surfaces and the concave surfaces in the height direction of the box structure. Each supporting surface is connected between one convex surface and one concave surface, so that an included angle is formed between the supporting surface and the convex surface, and an included angle is also formed between the supporting surface and the concave surface.

6. The box structure of claim 5, wherein, A plurality of groups of first fixing points are arranged on the bottom plate along the length direction of the box structure. A plurality of structure plates are connected on the second surface along the length direction of the box structure. A group of second fixing points is arranged on each structure plate, so that one group of the second fixing points corresponds to one group of the first fixing points. The box structure is connected with the battery holder through the plurality of groups of the first fixing points and the plurality of groups of the second fixing points.

7. The box structure of claim 6, wherein, The connecting pieces comprise first connecting pieces close to the second fixing points and second connecting pieces arranged at other positions of the structure plate. The ratio of the number of the first connecting pieces to the number of the second connecting pieces is 2:

3.

8. The box structure of claim 6, wherein, The two concave surfaces and the four supporting surfaces form two grooves. Pads are arranged in the grooves. The second fixing points are arranged on the pads.

9. A battery pack, characterized by, The application further relates to a battery module and the box structure. The battery module is placed in the box structure. The box structure is used for protecting the battery module.

10. An electric device, comprising device circuitry, a battery holder and the battery pack. The box structure in the battery pack is mounted on the battery holder, so that the battery module in the battery pack is connected with the device circuitry, and the electric device is provided with electric energy.

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