Battery box, battery and electric device

Abstract

The utility model discloses a battery box, a battery and an electric device. The battery box comprises a box main body, a cover body assembly and a fixing piece, wherein the box main body is provided with an accommodating groove; the cover body assembly comprises a cover plate and a fixing plate which are connected with each other, the cover plate covers a groove opening of the containing groove in the covering direction, and the fixing plate and the box body are at least partially overlapped in the locking direction perpendicular to the covering direction; the fixing piece is inserted into the box body and the fixing plate in the locking direction. Therefore, the battery cells can be well protected through the battery box. The fixing plate is at least partially overlapped with the box body main body in the locking direction, so that the fixing piece can be conveniently inserted into the box body main body and the fixing plate in the locking direction, the box body main body and the cover body assembly are fixed from the side edge, the reasonability of the space layout of the battery box is improved, the energy density of the battery box is improved, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery box, a battery and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to sustainable development, which has promoted the adjustment of energy structure and the development and application of battery technology. The key to the development of battery technology lies in electrochemical energy storage technology, which has been widely used in portable electronics, electric vehicles and energy storage systems due to its high energy density, good cycle capacity, high operating voltage, environmental protection and low self-discharge.

[0003] As the main load-bearing component of the battery, the battery box may include a two-part structure, which is formed by fixing the two-part structure. However, the fixing method in the prior art easily leads to problems such as unreasonable spatial layout of the battery box, low energy density, and high manufacturing cost. Utility Model Content

[0004] The main purpose of this application is to provide a battery box, a battery and an electrical device, aiming to solve the above-mentioned technical problems existing in the prior art.

[0005] In order to solve the above problems, the present application provides a battery box, which includes: a box body, a cover assembly and a fixing member, the box body has a receiving groove; the cover assembly includes a cover plate and a fixing plate connected to each other, the cover plate is covered on the notch of the receiving groove along the covering direction, and the fixing plate and the box body at least partially overlap in the locking direction perpendicular to the covering direction; the fixing member is inserted into the box body and the fixing plate along the locking direction. Thus, the cover plate is covered on the notch of the receiving groove to form a space for accommodating battery cells, so that the battery box can provide better protection for the battery cells. The fixing plate at least partially overlaps with the box body in the locking direction, which can facilitate the fixing member to be inserted into the box body and the fixing plate along the locking direction, so as to fix the box body and the cover assembly from the side, improve the rationality of the battery box space layout, and improve the energy density of the battery box, thereby reducing the production cost.

[0006] In some embodiments, the box body includes a side wall portion, the fixing plate is attached to the outer side of the side wall portion away from the receiving groove, and the fixing member is inserted into the side wall portion and the fixing plate. Thus, the fixing plate is attached to the outer side of the side wall portion away from the receiving groove, and the box body and the cover assembly can be initially positioned, and the fixing member can also be inserted into the side wall portion and the fixing plate to fix the box body and the cover assembly.

[0007] In some embodiments, the side wall portion includes an outer wall and an inner wall, the outer wall and the inner wall are arranged relative to each other in the locking direction to form a hollow cavity, and the fixing piece is inserted into the fixing plate and the outer wall and extends into the hollow cavity. Thus, the fixing piece is inserted into the fixing plate and the outer wall and extends into the hollow cavity, which can reduce the thickness of the plate that the fixing piece needs to penetrate, thereby reducing the difficulty of inserting the fixing piece and improving production efficiency.

[0008] In some embodiments, the fixing member includes a first fixing portion, a second fixing portion, and a third fixing portion connected in sequence, the first fixing portion abuts against the surface of the fixing plate away from the side wall portion, the second fixing portion is inserted between the fixing plate and the outer side wall, and the third fixing portion is located in the hollow cavity. Thus, the second fixing portion is inserted between the fixing plate and the outer side wall, the third fixing portion is located in the hollow cavity, and the first fixing portion abuts against the surface of the fixing plate away from the side wall portion, which can reduce the difficulty of inserting the fixing member and improve the fixing effect of the fixing member on the box body and the cover assembly.

[0009] In some embodiments, the fixing member further includes a fourth fixing portion, the fourth fixing portion is connected to the third fixing portion, and the fourth fixing portion is inserted into the inner side wall. Thus, the fixing member further includes a fourth fixing portion, and the fourth fixing portion is inserted into the inner side wall, which can further improve the fixing effect of the fixing member on the box body and the cover assembly.

[0010] In some embodiments, the thickness of the outer wall in the locking direction is greater than the thickness of the fixing plate in the locking direction. Thus, the thickness of the outer wall is greater than the thickness of the fixing plate, so as to improve the structural strength of the side wall portion, thereby improving the fixing effect of the fixing member on the box body and the cover assembly.

[0011] In some embodiments, the box body includes a bottom wall portion and a side wall portion, and the side wall portion surrounds the bottom wall portion to form a receiving groove. Thus, the side wall portion surrounds the bottom wall portion to form the receiving groove, which can facilitate the cover plate to cover the notch of the receiving groove along the covering direction and improve the stability of the cover plate and the side wall portion after covering.

[0012] In some embodiments, the battery box further comprises a seal, which is clamped between the cover plate and the end surface of the side wall away from the bottom wall. Thus, the seal is clamped between the cover plate and the end surface of the bottom wall, which can improve the sealing effect of the battery box and further improve the protection of the battery box to the battery cells.

[0013] In some embodiments, the sealing member is annular and surrounds the notch of the receiving groove. Thus, the annular sealing member surrounds the notch of the receiving groove, which can further improve the sealing effect of the battery box.

[0014] In some embodiments, the thickness of the side wall in the locking direction is greater than or equal to 10 mm and less than or equal to 15 mm. Therefore, the thickness of the side wall is greater than or equal to 10 mm and less than or equal to 15 mm, which can alleviate the problem of low structural strength of the side wall due to the small thickness of the side wall, and can also alleviate the problem of reduced energy density of the battery box due to the large thickness of the side wall.

[0015] In some embodiments, the fixing plate includes a fixing portion and a connecting portion, the connecting portion is respectively connected to the fixing portion and the cover plate, the angle between the connecting portion and the cover plate is an acute angle, and the fixing piece is inserted into the box body and the fixing portion. Therefore, the angle between the connecting portion and the cover plate is an acute angle, and when the cover plate is covered on the box body, the problem of dimensional tolerance caused by the manufacturing of the box body and the cover assembly can be alleviated by the connecting portion, which facilitates the fixing piece to be inserted into the box body and the fixing portion, thereby improving the fixing effect of the fixing piece on the box body and the cover assembly.

[0016] In some embodiments, the fixing member includes a self-tapping screw, thereby alleviating the risk of dimensional tolerance caused by opening the fixing holes on the box body and the fixing plate, thereby improving the fixing efficiency and fixing effect of the box body and the cover assembly.

[0017] In order to solve the above problems, the present application provides a battery, which includes a battery cell and the above-mentioned battery box, and the battery box is used to accommodate the battery cell.

[0018] In order to solve the above problems, the present application provides an electrical device, which includes the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a schematic diagram of the structure of a vehicle according to one or more embodiments;

[0021] Figure 2 is a schematic diagram of an exploded structure of a battery according to one or more embodiments;

[0022] Figure 3 is a schematic diagram of the structure of a battery box according to one or more embodiments;

[0023] Figure 4 yes Figure 3 Schematic diagram of disassembly of the battery box shown;

[0024] Figure 5 yes Figure 3 The first cross-sectional schematic diagram of the battery box shown along the AA direction;

[0025] Figure 6 yes Figure 3 A second cross-sectional schematic diagram of the battery box shown along the AA direction;

[0026] Figure 7 is a schematic cross-sectional view according to one or more embodiments of the cover assembly.

[0027] Figure numbers: vehicle 1; battery 2; controller 3; motor 4; battery box 10; box body 11; side wall portion 111; outer wall 1111; inner wall 1112; bottom wall portion 112; hollow cavity 113; cover assembly 12; fixing plate 121; connecting portion 1211; fixing portion 1212; cover plate 122; fixing member 13; first fixing portion 131; second fixing portion 132; third fixing portion 133; fourth fixing portion 134; accommodating groove 14; sealing member 15; battery cell 20; angle A; thickness dimension D; covering direction X; locking direction Y. DETAILED DESCRIPTION

[0028] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0030] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0031] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0033] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0034] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0035] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0036] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0037] Batteries mentioned in this field can be divided into disposable batteries and rechargeable batteries according to whether they are rechargeable. Disposable batteries (Primary Battery) are also called "disposable" batteries and original batteries, because after they are exhausted, they can no longer be recharged and can only be discarded. Rechargeable batteries are also called secondary batteries (Secondary Battery) or secondary batteries, storage batteries. The manufacturing materials and processes of rechargeable batteries are different from those of primary batteries. Its advantage is that it can be recycled many times after charging, and the output current load capacity of rechargeable batteries is higher than that of most disposable batteries. The common types of rechargeable batteries at present are: lead-acid batteries, nickel-metal hydride batteries and lithium-ion batteries. Lithium-ion batteries have the advantages of light weight, large capacity (the capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight), no memory effect, and have a very low self-discharge rate. Therefore, even though the price is relatively high, they are still widely used. Lithium-ion batteries are currently also widely used in pure electric vehicles and hybrid vehicles. The capacity of lithium-ion batteries used for this purpose is relatively low, but they have a larger output and charging current, and also have a longer service life, but the cost is higher.

[0038] The battery described in the embodiments of the present application refers to a rechargeable battery or a disposable battery. The embodiments disclosed in the present application will be described below mainly by taking a lithium-ion battery as an example. It should be understood that the embodiments disclosed in the present application are applicable to any other appropriate type of rechargeable battery. The battery mentioned in the embodiments disclosed in the present application can be directly or indirectly applied to an appropriate device to power the device.

[0039] The present application provides an electric device, which may include but is not limited to mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles and spacecraft, etc. Among them, the electric device may include a battery, and the electric device may provide electric energy through the battery to realize the corresponding function.

[0040] The present application also provides an electric vehicle, which may include a battery.

[0041] Please refer to Figure 1 , Figure 1 is a schematic diagram of the structure of a vehicle according to one or more embodiments.

[0042] The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle, etc. A battery 2 is arranged inside the vehicle 1, and the battery 2 may be arranged at the bottom, the head or the tail of the vehicle 1. The battery 2 may be used to power the vehicle 1, for example, the battery 2 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 3 and a motor 4, and the controller 3 is used to control the battery 2 to power the motor 4, for example, for starting, navigating and driving the vehicle 1.

[0043] In some embodiments of the present application, the battery 2 can be used not only as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0044] In order to improve the performance of the electrical device, the present application also provides a battery, see Figure 2 , Figure 2 is a schematic diagram of an exploded structure of a battery according to one or more embodiments.

[0045] The shape of the battery may include but is not limited to a square, cylindrical or other arbitrary shapes.

[0046] In some embodiments, the battery 2 may include a battery case 10 and a battery cell 20 , wherein the battery cell 20 is accommodated in the battery case 10 .

[0047] In the battery 2, there can be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the battery box 10; of course, the battery 2 can also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the battery box 10. The battery 2 can also include other structures, for example, the battery 2 can also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0048] The manufacturing methods of the battery cell 20 include stacking and winding, that is, the battery cell 20 is divided into stacking cells and winding cells. The stacking battery has a uniform current collection effect, a small internal resistance of the battery, and a large specific power, but in order to improve the precision, the mold precision is extremely high, the equipment investment is high, and the process is relatively complex, and the production efficiency is low. The winding battery is simple to make, and the equipment precision requirements for the production and assembly process are general, the production efficiency is high, and the cost is low. In terms of performance, the winding battery has excellent high and low temperature performance, charges very quickly, has an ultra-long life, a stable high output voltage, a solid structure, and strong shock resistance.

[0049] The battery box 10 is used to provide a housing for the battery cell 20, and the battery box 10 can adopt a variety of structures. As the main bearing component of the battery 2, the battery box 10 can include a two-part structure. For example, the battery box 10 may include a box body 11 and a cover assembly 12. The box body 11 and the cover assembly 12 cover each other, and the box body 11 and the cover assembly 12 jointly define a housing cavity for accommodating the battery cell 20. The battery box 10 can be formed by fixing the box body 11 and the cover assembly 12. However, the fixing method of the relevant embodiment is likely to lead to unreasonable spatial layout of the battery box, low energy density, and high manufacturing cost.

[0050] In order to solve the technical problems existing in the related art, the present application provides a battery box, see Figure 3 and Figure 4 , Figure 3 is a schematic diagram of the structure of a battery box according to one or more embodiments, Figure 4 yes Figure 3 Schematic diagram of the disassembly of the battery box shown.

[0051] The battery box 10 includes a box body 11 and a cover assembly 12. The box body 11 and the cover assembly 12 can cover each other, so that the box body 11 and the cover assembly 12 jointly define a receiving cavity for accommodating a battery cell 20. Exemplarily, the box body 11 has a receiving groove 14, and the cover assembly 12 can be a plate-shaped structure. The cover assembly 12 can cover the notch of the receiving groove 14, so that the box body 11 and the cover assembly 12 jointly define a receiving cavity for accommodating a battery cell 20. Alternatively, the box body 11 and the cover assembly 12 can also be both provided with a receiving groove 14, and the notch side of the box body 11 covers the notch side of the cover assembly 12, so that the box body 11 and the cover assembly 12 jointly define a receiving cavity for accommodating a battery cell 20.

[0052] Specifically, the cover assembly 12 includes a cover plate 122 and a fixing plate 121 connected to each other. The cover plate 122 covers the notch of the accommodating groove 14 along the covering direction X. In the locking direction Y perpendicular to the covering direction X, the fixing plate 121 at least partially overlaps with the box body 11. When it is necessary to form the battery box 10 by the box body 11 and the cover assembly 12, the box body 11 and the cover assembly 12 are relatively moved in a certain direction so that the cover plate 122 covers the accommodating groove 14 of the box body 11, thereby forming an accommodating cavity for accommodating the battery cell 20. The direction of relative movement of the box body 11 and the cover assembly 12 can be understood as the covering direction X. The end surface of the cover plate 122 may be greater than or equal to the notch of the receiving groove 14. When the cover plate 122 is covered on the notch of the receiving groove 14, the cover plate 122 abuts against the box body 11 and completely blocks the notch of the receiving groove 14, so that the receiving groove 14 forms a receiving cavity for receiving the battery cell 20. The fixing plate 121 may be connected to the edge of the cover plate 122, and the fixing plate 121 may be arranged around the four sides of the cover plate 122 along the circumference of the cover plate 122, or the fixing plate 121 may be arranged around part of the circumference of the cover plate 122. If the two ends of the box body 11 in the covering direction X are recorded as the upper and lower ends of the battery box 10, since the covering direction X and the locking direction Y are perpendicular to each other, when the fixing plate 121 and the box body 11 at least partially overlap in the locking direction Y, it can be understood that the fixing plate 121 and the box body 11 at least partially overlap on the side of the battery box 10.

[0053] The battery box 10 may further include a fixing member 13, which is inserted into the box body 11 and the fixing plate 121 along the locking direction Y. The fixing member 13 may include but is not limited to a member that can keep two objects relatively fixed, such as a bolt or a screw. The fixing member 13 is inserted into the box body 11 and the fixing member 13, which can be understood as: the fixing member 13 passes through the opposite side surfaces of the fixing plate 121 and the opposite side surfaces of the side wall of the box body 11 at the same time; or the fixing member 13 passes through the opposite side surfaces of the fixing plate 121 and is inserted into the side wall of the box body 11; or the fixing member 13 passes through the opposite side surfaces of the side wall of the box body 11 and is inserted into the fixing plate 121. The fixing member 13 is inserted into the box body 11 and the fixing plate 121 along the locking direction Y, that is, the fixing member 13 is inserted into the box body 11 and the fixing plate 121 from the side of the battery box 10 to fix the box body 11 and the cover assembly 12.

[0054] Through the above embodiment, the cover plate 122 is covered on the notch of the accommodating groove 14 to form a space for accommodating the battery cell 20, so that the battery box 10 can provide better protection for the battery cell 20. The fixing plate 121 at least partially overlaps with the box body 11 in the locking direction Y, which can facilitate the fixing member 13 to be inserted into the box body 11 and the fixing plate 121 along the locking direction Y, so as to fix the box body 11 and the cover assembly 12 from the side, improve the rationality of the spatial layout of the battery box 10, and improve the energy density of the battery box 10, thereby reducing the production cost.

[0055] Furthermore, the fixing member 13 includes a self-tapping screw. Pre-drilled holes can be drilled at positions corresponding to the fixing plate 121 and the box body 11, and then the self-tapping screws are inserted into the drilled pre-drilled holes, and the self-tapping screws are rotated relative to the fixing plate 121 and the box body 11, so that the self-tapping screws are screwed into the pre-drilled holes to fix the box body 11 and the cover assembly 12. The self-tapping screws can be hot-melt self-tapping screws (Flow Drill Srew, FDS), and the self-tapping screws are inserted into the fixing plate 121 and the box body 11 in a corresponding manner to fix the box body 11 and the cover assembly 12. In this way, the risk of dimensional tolerance caused by opening fixing holes on the box body 11 and the fixing plate 121 can be alleviated, thereby improving the fixing efficiency and fixing effect of the box body 11 and the cover assembly 12.

[0056] See also Figure 5 , Figure 5 yes Figure 3 The first cross-sectional schematic diagram of the battery box along the AA direction is shown.

[0057] The box body 11 includes a bottom wall portion 112 and a side wall portion 111, and the side wall portion 111 surrounds the bottom wall portion 112 to form a receiving groove 14. The bottom wall portion 112 and the side wall portion 111 can be integrally arranged, and the surface of the bottom wall portion 112 facing the receiving groove 14 and the surface of the side wall portion 111 facing the receiving groove 14 can be perpendicular to each other. The side wall portion 111 is cylindrical, for example, the side wall portion 111 is cylindrical or multi-prism cylindrical with openings at both ends, the bottom wall portion 112 and the side wall portion 111 are connected, and the end surface of the side wall portion 111 away from the bottom wall portion 112 can be in the same horizontal plane, and the bottom wall portion 112 can block one end opening of the side wall portion 111, so that the side wall portion 111 and the bottom wall portion 112 cooperate to form the receiving groove 14. Thus, the side wall portion 111 surrounds the bottom wall portion 112 to form the receiving groove 14 , which can facilitate the cover plate 122 to cover the notch of the receiving groove 14 along the covering direction X and improve the stability of the cover plate 122 and the side wall portion 111 after covering.

[0058] Furthermore, the fixing plate 121 is attached to the outer side of the side wall portion 111 away from the receiving groove 14, and the fixing member 13 is inserted into the side wall portion 111 and the fixing plate 121. When the cover plate 122 is covered on the side of the side wall portion 111 away from the bottom wall portion 112, the fixing plate 121 can be attached to the outer side of the side wall portion 111 away from the receiving groove 14, so that the fixing member 13 can insert the fixing plate 121 and the side wall portion 111 along the locking direction Y, and at the same time, it can also alleviate the risk of the cover plate 122 being warped and deformed during the process of the fixing member 13 inserting the fixing plate 121 and the side wall portion 111. In some other embodiments, the fixing plate 121 can also be inserted into the side wall portion 111, or the outer side wall 1111 of the fixing plate 121 can be attached to the inner side wall 1112 of the side wall portion 111, and so on. The fixing member 13 and the side wall portion 111 may both be cylindrical, and the radial dimension of the outer side of the side wall portion 111 may be slightly smaller than the radial dimension of the inner side of the fixing plate 121, so that when the cover plate 122 is covered on the side of the side wall portion 111 away from the bottom wall portion 112, the fixing plate 121 is sleeved on the outer side of the side wall portion 111. Thus, the fixing plate 121 is attached to the outer side of the side wall portion 111 away from the receiving groove 14, and the box body 11 and the cover assembly 12 can be preliminarily positioned, and at the same time, the fixing member 13 can be inserted into the side wall portion 111 and the fixing plate 121 to fix the box body 11 and the cover assembly 12.

[0059] In some embodiments, the battery box 10 further includes a seal 15, which is clamped between the cover plate 122 and the end surface of the side wall portion 111 away from the bottom wall portion 112. The seal 15 may be a plastic part, and the material of the seal 15 may include but is not limited to polytetrafluoroethylene, metal or polyether ketone, etc. The seal 15 can be squeezed to deform, and the seal 15 is clamped between the cover plate 122 and the end surface of the side wall portion 111 away from the bottom wall portion 112, which can improve the sealing effect of the battery box 10, and further improve the protection of the battery box 10 to the battery cell 20. In some assembly scenarios, the seal 15 can be placed on the end surface of the side wall portion 111 away from the bottom wall portion 112, and then the cover plate 122 is covered on the notch of the accommodating groove 14, and the seal 15 is squeezed from the side of the cover plate 122 away from the side wall portion 111. When squeezed to a predetermined position, the box body 11 and the cover assembly 12 are fixed along the locking direction Y by the fixing member 13.

[0060] Furthermore, the sealing member 15 is annular, and surrounds the notch of the receiving groove 14. The shape of the sealing member 15 can match the shape of the end surface of the side wall portion 111 away from the bottom wall portion 112, so that the sealing member 15 is clamped between the cover plate 122 and the side wall portion 111, and the receiving groove 14 can be sealed along the circumference of the notch of the receiving groove 14 by the sealing member 15, which can further improve the sealing effect of the battery box 10.

[0061] Furthermore, the thickness dimension D of the side wall portion 111 in the locking direction Y is greater than or equal to 10 mm and less than or equal to 15 mm. Specifically, the thickness dimension D of the side wall portion 111 in the locking direction Y can be 10 mm, 11 mm, 12 mm, 13 mm, 14 mm or 15 mm, etc. The thickness dimension D of the side wall portion 111 in the locking direction Y is greater than or equal to 11 mm and less than or equal to 14 mm, greater than or equal to 12 mm and less than or equal to 15 mm, or greater than or equal to 11.5 mm and less than or equal to 14 mm, etc. In this way, the low structural strength of the side wall portion 111 due to the small thickness of the side wall portion 111 can be alleviated, and at the same time, the problem of reduced energy density of the battery box 10 due to the large thickness of the side wall portion 111 can be alleviated.

[0062] In some embodiments, the side wall portion 111 includes an outer side wall 1111 and an inner side wall 1112, the outer side wall 1111 and the inner side wall 1112 are relatively spaced apart along the locking direction Y to form a hollow cavity 113, and the fixing member 13 is inserted into the fixing plate 121 and the outer side wall 1111 and extends into the hollow cavity 113. The outer side wall 1111 can be understood as a side wall of the side wall portion 111 facing the receiving groove 14, and the inner side wall 1112 is a side wall of the side wall portion 111 away from the receiving groove 14. The fixing part 13 is inserted into the fixing plate 121 and the outer wall 1111 and extends into the hollow cavity 113. Compared with the side wall portion 111, it is a solid structure, and the wall thickness of the side wall where the fixing part 13 is inserted is reduced. For example, when the fixing part 13 is a self-tapping screw, it is easier for the self-tapping screw to penetrate the fixing plate 121 and the outer wall 1111. By reducing the thickness of the plate that the fixing part 13 needs to penetrate, the difficulty of inserting the fixing part 13 is reduced, thereby improving production efficiency.

[0063] Furthermore, the thickness of the outer wall 1111 in the locking direction Y is greater than the thickness of the fixing plate 121 in the locking direction Y. The wall thickness of the outer wall 1111 in the locking direction Y can be understood as the distance between the surface of the outer wall 1111 on the side facing the hollow cavity 113 and the surface of the outer wall 1111 on the side facing away from the hollow cavity 113. The thickness of the fixing plate 121 in the locking direction Y can be understood as the distance between the surface of the fixing plate 121 on the side that fits the outer wall 1111 and the surface on the side facing away from the outer wall 1111. When the wall thickness of the outer wall 1111 is greater than the wall thickness of the fixing plate 121, the structural strength of the side wall portion 111 can be improved, thereby improving the fixing effect of the fixing member 13 on the box body 11 and the cover assembly 12. When the wall thickness of the fixing plate 121 is small, it can be easier for the fixing member 13 to be inserted into the fixing plate 121, thereby improving the installation and fixing efficiency.

[0064] Furthermore, the fixing member 13 includes a first fixing portion 131 fixing portion 1212, a second fixing portion 132 fixing portion 1212 and a third fixing portion 133 fixing portion 1212 which are connected in sequence, the first fixing portion 131 fixing portion 1212 abuts against the surface of the fixing plate 121 away from the side wall portion 111, the second fixing portion 132 fixing portion 1212 is inserted between the fixing plate 121 and the outer wall 1111, and the third fixing portion 133 fixing portion 1212 is located in the hollow cavity 113. In this embodiment, the end of the third fixing portion 133 fixing portion 1212 away from the first fixing portion 131 fixing portion 1212 may have a sharp corner to facilitate the insertion of the fixing member 13 into the fixing plate 121 and the side wall portion 111 through the third fixing portion 133 fixing portion 1212. The radial dimension of the third fixing portion 133 fixing portion 1212 from the end away from the second fixing portion 132 fixing portion 1212 to the end close to the second fixing portion 132 fixing portion 1212 may gradually increase, so as to reduce the difficulty of inserting the fixing member 13. At the connection between the third fixing portion 133 fixing portion 1212 and the second fixing portion 132 fixing portion 1212, the radial dimension of the third fixing portion 133 fixing portion 1212 may be the same as the radial dimension of the second fixing portion 132 fixing portion 1212, and the outer surface of the second fixing portion 132 fixing portion 1212 may have an external thread, and when the second fixing portion 132 fixing portion 1212 is inserted between the fixing plate 121 and the outer wall 1111, the side wall portion 111 and the fixing plate 121 can be fixed in the locking direction Y by the second fixing portion 132 fixing portion 1212. The radial dimension of the fixing portion 1212 of the first fixing portion 131 may be greater than the radial dimension of the fixing portion 1212 of the second fixing portion 132. When the fixing portion 1212 of the first fixing portion 131 abuts against the surface of the fixing plate 121 away from the side wall portion 111, the fixing portion 1212 of the first fixing portion 131 may abut against the side wall portion 111 and the fixing plate 121, thereby improving the fixing effect of the side wall portion 111 and the fixing plate 121.

[0065] See also Figure 6 , Figure 6 yes Figure 3 The second cross-sectional schematic diagram of the battery box along the AA direction is shown.

[0066] The fixing member 13 further includes a fourth fixing portion 134 fixing portion 1212, the fourth fixing portion 134 fixing portion 1212 is connected to the third fixing portion 133 fixing portion 1212, and the fourth fixing portion 134 fixing portion 1212 is inserted into the inner side wall 1112. In this embodiment, the end of the fourth fixing portion 134 fixing portion 1212 away from the first fixing portion 131 fixing portion 1212 may have a sharp angle, so that the fixing member 13 can be inserted into the fixing plate 121 and the side wall portion 111 through the fourth fixing portion 134 fixing portion 1212, and the radial dimension of the fourth fixing portion 134 fixing portion 1212 from the end away from the third fixing portion 133 fixing portion 1212 to the end close to the third fixing portion 133 fixing portion 1212 can gradually increase, so as to reduce the difficulty of inserting the fixing member 13. The fixing portion 1212 of the fourth fixing portion 134 can be inserted into the inner side wall 1112, so that the fixing portion 1212 of the fourth fixing portion 134 can be better limited by the inner side wall 1112, thereby improving the fixing effect of the fixing member 13 on the box body 11 and the cover assembly 12. Among them, the end of the fixing portion 1212 of the fourth fixing portion 134 can be embedded in the inner side wall 1112 to alleviate the risk that the end of the fixing portion 1212 of the first fixing portion 131 protrudes from the inner side wall 1112 to the accommodating groove 14 and causes damage to the battery cell 20 in the accommodating groove 14. At the connection between the fourth fixing portion 134 fixing portion 1212 and the third fixing portion 133 fixing portion 1212, the radial dimension of the fourth fixing portion 134 fixing portion 1212 can be the same as the radial dimension of the third fixing portion 133 fixing portion 1212, and at the connection between the third fixing portion 133 fixing portion 1212 and the second fixing portion 132 fixing portion 1212, the radial dimension of the third fixing portion 133 fixing portion 1212 can be the same as the radial dimension of the second fixing portion 132 fixing portion 1212, thereby reducing the difficulty of inserting the fixing part 13.

[0067] See also Figure 7 , Figure 7 is a schematic cross-sectional view according to one or more embodiments of the cover assembly.

[0068] The fixing plate 121 includes a fixing portion 1212 and a connecting portion 1211. The connecting portion 1211 connects the fixing portion 1212 and the cover plate 122 respectively. The angle A at the connection between the connecting portion 1211 and the cover plate 122 is an acute angle. The fixing member 13 is inserted into the box body 11 and the fixing portion 1212. The connecting portion 1211 can be bent relative to the cover plate 122. For example, the connecting portion 1211 can be bent toward the inner side of the cover plate 122 so that the angle A at the connection between the connecting portion 1211 and the cover plate 122 is an acute angle. The angle A at the connection between the connecting portion 1211 and the cover plate 122 can be understood as the angle A between the two opposite surfaces of the connecting portion 1211 and the cover plate 122. Specifically, the angle A at the connection between the connecting portion 1211 and the cover plate 122 can be greater than or equal to 60° and less than 90°, or greater than or equal to 60° and less than or equal to 80°, or greater than or equal to 70° and less than or equal to 85°, etc. For example, the angle A between the connection portion 1211 and the cover plate 122 may include but is not limited to 80°, 85°, 75°, 70°, 75° or 60°, etc.

[0069] The fixing portion 1212 can be bent and connected to the connecting portion 1211, and the angle between the fixing portion 1212 and the connecting portion 1211 can be an obtuse angle. The fixing portion 1212 can be spaced apart from the cover plate 122 by the connecting portion 1211 in the covering direction X. When the box body 11 has a side wall portion 111, and the cover assembly 12 is covered on the box body 11, the connecting portion 1211 can be spaced apart from the side wall portion 111 of the box body 11, and the fixing portion 1212 can be fitted with the outer side surface of the side wall portion 111 of the box body 11, so that the fixing member 13 can be inserted into the box body 11 and the fixing portion 1212. When the cover plate 122 is covered on the box body 11, the connection portion 1211 can be used to alleviate the problem of dimensional tolerance caused by the box body 11 and the cover assembly 12 during manufacturing, so that the fixing member 13 can be inserted into the box body 11 and the fixing portion 1212, thereby improving the fixing effect of the fixing member 13 on the box body 11 and the cover assembly 12. The connection portion 1211 can be an elastic connection portion 1211, and the elasticity of the connection portion 1211 can further alleviate the problem of dimensional tolerance caused by the box body 11 and the cover assembly 12 during manufacturing.

[0070] In summary, the cover plate 122 is covered on the notch of the accommodating groove 14 to form a space for accommodating the battery cell 20, so that the battery box 10 can provide better protection for the battery cell 20. The fixing plate 121 at least partially overlaps with the box body 11 in the locking direction Y, so that the fixing member 13 can be inserted into the box body 11 and the fixing plate 121 along the locking direction Y to fix the box body 11 and the cover assembly 12 from the side, thereby improving the rationality of the spatial layout of the battery box 10, improving the energy density of the battery box 10, and reducing the production cost.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery box (10), characterized in that: The battery box (10) comprises: The box body (11) has a receiving groove (14); A cover assembly (12) comprising a cover plate (122) and a fixing plate (121) connected to each other, wherein the cover plate (122) covers the notch of the accommodating groove (14) along a covering direction (X), and in a locking direction (Y) perpendicular to the covering direction (X), the fixing plate (121) at least partially overlaps with the box body (11); A fixing member (13) is inserted into the box body (11) and the fixing plate (121) along the locking direction (Y).

2. The battery box (10) according to claim 1, characterized in that: The box body (11) comprises a side wall portion (111), the fixing plate (121) is attached to the outer side surface of the side wall portion (111) away from the receiving groove (14), and the fixing member (13) is inserted into the side wall portion (111) and the fixing plate (121).

3. The battery box (10) according to claim 2, characterized in that: The side wall portion (111) comprises an outer side wall (1111) and an inner side wall (1112), wherein the outer side wall (1111) and the inner side wall (1112) are arranged relatively spaced apart along the locking direction (Y) to form a hollow cavity (113), and the fixing member (13) is inserted into the fixing plate (121) and the outer side wall (1111) and extends into the hollow cavity (113).

4. The battery box (10) according to claim 3, characterized in that: The fixing member (13) comprises a first fixing portion (131), a second fixing portion (132) and a third fixing portion (133) which are connected in sequence, the first fixing portion (131) abuts against a surface of the fixing plate (121) which is away from the side wall portion (111), the second fixing portion (132) is inserted between the fixing plate (121) and the outer side wall (1111), and the third fixing portion (133) is located in the hollow cavity (113).

5. The battery box (10) according to claim 4, characterized in that: The fixing member (13) further comprises a fourth fixing portion (134), wherein the fourth fixing portion (134) is connected to the third fixing portion (133), and the fourth fixing portion (134) is inserted into the inner side wall (1112).

6. The battery box (10) according to any one of claims 3 to 5, characterized in that: The thickness of the outer side wall (1111) in the locking direction (Y) is greater than the thickness of the fixing plate (121) in the locking direction (Y).

7. The battery box (10) according to any one of claims 1 to 6, characterized in that: The box body (11) comprises a bottom wall portion (112) and a side wall portion (111), wherein the side wall portion (111) surrounds the bottom wall portion (112) to form the accommodating groove (14).

8. The battery box (10) according to claim 7, characterized in that: The battery box (10) further comprises a sealing member (15), wherein the sealing member (15) is clamped between the cover plate (122) and an end surface of the side wall portion (111) away from the bottom wall portion (112).

9. The battery box (10) according to claim 8, characterized in that: The sealing member (15) is annular and surrounds the notch of the accommodating groove (14).

10. The battery box (10) according to any one of claims 2 to 9, characterized in that: The thickness dimension (D) of the side wall portion (111) in the locking direction (Y) is greater than or equal to 10 mm and less than or equal to 15 mm.

11. The battery box (10) according to any one of claims 1 to 10, characterized in that: The fixing plate (121) comprises a fixing portion (1212) and a connecting portion (1211), wherein the connecting portion (1211) respectively connects the fixing portion (1212) and the cover plate (122), and an angle (A) at a connection between the connecting portion (1211) and the cover plate (122) is an acute angle, and the fixing member (13) is inserted into the box body (11) and the fixing portion (1212).

12. The battery box (10) according to any one of claims 1 to 11, characterized in that: The fixing member (13) comprises a self-tapping screw.

13. A battery (2), characterized in that: The battery (2) comprises a battery cell (20) and a battery box (10) according to any one of claims 1 to 12, wherein the battery box (10) is used to accommodate the battery cell (20).

14. An electrical device, characterized in that: The electrical device comprises the battery (2) according to claim 13.

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