Battery box, battery and electrical device

Abstract

The embodiments of the present application provide a battery box, a battery and an electrical device, wherein the box includes a load-bearing plate, a side beam and a reinforcing plate. The load-bearing plate includes a load-bearing area and a connection area, and the load-bearing area is used to place battery cells. The side beams and the load-bearing plate enclose a receiving cavity for accommodating battery cells, and the side beams are connected to the connection area. At least a portion of the reinforcing plate overlaps with the connection area in the thickness direction of the load-bearing plate and is connected to the connection area. The embodiments of the present application increase the thickness of the connection area by adding a reinforcing plate and at least partially overlapping the reinforcing plate with the connection area, thereby increasing the structural strength of the battery at the connection area and reducing the risk of deformation or damage at the connection area due to external force impact and other factors.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more specifically, to a battery case, a battery, and an electrical device. Background Art

[0002] At present, batteries are widely used in various electrical devices such as vehicles. Some electrical devices are often accompanied by movement or vibration during operation. In this case, how to improve the structural strength of the battery is extremely important. Summary of the invention

[0003] The present application provides a battery box, a battery and an electrical device, which can improve the structural strength of the battery.

[0004] In a first aspect, an embodiment of the present application provides a battery box, the box comprising a load-bearing plate, a side beam, and a reinforcing plate. The load-bearing plate comprises a load-bearing area and a connection area, and the load-bearing area is used to place a battery cell. The side beam and the load-bearing plate enclose a receiving cavity for accommodating a battery cell, and the side beam is connected to the connection area. At least a portion of the reinforcing plate overlaps with the connection area in the thickness direction of the load-bearing plate and is connected to the connection area.

[0005] In the embodiment of the present application, a reinforcing plate is added and the reinforcing plate is at least partially overlapped with the connection area to increase the thickness of the connection area, thereby improving the structural strength of the battery at the connection area and reducing the risk of deformation or damage at the connection area due to external force impact and other factors.

[0006] In some embodiments, the minimum thickness of the reinforcing plate is H, 0.2 mm ≤ H ≤ 30 mm.

[0007] In the embodiment of the present application, H is set between 0.2mm and 30mm, which can improve the structural strength of the battery, reduce the risk of deformation or damage of the battery, and improve the reliability of the battery without greatly affecting the overall weight of the battery. Optionally, 0.5mm≤H≤10mm. Exemplarily, H is one of 0.5mm, 1mm, 5mm, 8mm and 10mm.

[0008] In some embodiments, the weight of the battery is M, and H and M satisfy: 0.0002mm / kg≤H / M≤1mm / kg.

[0009] In the embodiment of the present application, H / M is set between 0.0002mm / kg and 1mm / kg, which ensures that the battery has a high energy density while improving the structural strength of the battery and reducing the risk of deformation or breakage of the battery under external impact. Optionally, 0.0006mm / kg≤H / M≤0.2mm / kg. Exemplarily, H / M is one of 0.0006mm / kg, 0.003mm / kg, 0.01mm / kg, 0.05mm / kg and 0.2mm / kg.

[0010] In some embodiments, the minimum thickness H of the reinforcing plate is less than or equal to the minimum thickness of the carrying plate.

[0011] In the embodiment of the present application, the reinforcing plate is connected to the bearing plate to increase the thickness of the battery at least at a part of the bearing plate, thereby improving the structural strength of the battery. At the same time, the embodiment of the present application also takes into account the lightweight design of the battery, so the thickness H is set to be less than or equal to the minimum thickness of the bearing plate, so that the volume of the entire reinforcing plate is equal to the volume of the bearing plate, while improving the structural strength, the overall weight of the battery is reduced as much as possible.

[0012] In some embodiments, the reinforcing plate is located on a side of the carrying plate facing away from the accommodating cavity.

[0013] In the embodiment of the present application, by arranging the reinforcing plate on the side of the bearing plate away from the accommodating cavity, the reinforcing plate will not occupy the internal space of the accommodating cavity, that is, it will not affect the space available for the battery cell in the accommodating cavity, thereby ensuring the energy density of the battery. At the same time, it can also reduce the difficulty of battery preparation, which is conducive to large-scale production.

[0014] In some embodiments, the load-bearing region at least partially overlaps the reinforcement plate in the thickness direction.

[0015] In the embodiment of the present application, the load-bearing area and the reinforcing plate at least partially overlap, so that the reinforcing plate can increase the overall thickness of at least part of the load-bearing area, thereby reducing the impact of vibration, reducing the risk of debonding between the load-bearing plate and the battery cell, and improving the reliability of the relative position between the load-bearing plate and the battery cell. At the same time, the reinforcing plate can also improve the structural strength of at least part of the load-bearing area, thereby reducing the impact of external impact and other factors on the battery cell.

[0016] In some embodiments, the reinforcement plate is connected to the side beam.

[0017] In the embodiment of the present application, the side beam is connected to the load-bearing plate, and the positions of the two are kept relatively fixed. On this basis, by connecting the reinforcing plate to the side beam, the reinforcing plate and the side beam are kept fixed, thereby improving the reliability of the relative position between the reinforcing plate and the load-bearing plate.

[0018] In addition, during the battery preparation process, the reinforcing plate can be first connected and fixed to the side beam, and then the reinforcing plate and the side beam can be installed on the load-bearing plate as a whole to ensure the reliability of the relative position between the reinforcing plate and the side beam. Alternatively, the reinforcing plate can be first installed on the load-bearing plate, and then the side beam can be fixed to the reinforcing plate, so that the reliability of the connection between the load-bearing plate and the side beam can be improved by the reinforcing plate.

[0019] In some embodiments, there are multiple side beams, the multiple side beams are arranged along the circumference of the load-bearing plate, and the reinforcing plate is connected to at least one side beam.

[0020] In the embodiment of the present application, multiple side beams are connected end to end in sequence to form a closed loop structure, and multiple side beams are arranged around the outer periphery of the accommodating cavity. At the same time, the reinforcing plate is connected to at least one side beam to improve the reliability of the relative position between the side beam, the reinforcing plate and the load-bearing plate, so as to ensure the stability of the overall structure of the battery under different working conditions.

[0021] In some embodiments, the plurality of side beams include two first side beams and two second side beams, the two first side beams are spaced apart in the width direction of the box body, and the two second side beams are spaced apart in the length direction of the box body. Each second side beam connects two first side beams, and there are two reinforcing plates, which are spaced apart in the width direction and respectively connected to the two first side beams.

[0022] In the embodiment of the present application, two reinforcing plates are provided, and the two reinforcing plates are respectively connected to the two first side beams, thereby being able to improve the structural strength of the connection area between the battery cell and the first side beam in the load-bearing plate.

[0023] In some embodiments, a portion of the load-bearing plate is located between the first side beam and the reinforcement plate, and is connected to the first side beam and the reinforcement plate.

[0024] In the embodiment of the present application, by controlling the relative position relationship between the first side beam and the reinforcing plate, a portion of the load-bearing plate can be simultaneously located between the first side beam and the reinforcing plate, and the load-bearing plate can simultaneously achieve the connection between the load-bearing plate, the reinforcing plate and the first side beam through this portion. Compared with the solution of staggered installation of the first side beam and the reinforcing plate on the load-bearing plate, this design can allow more areas on the load-bearing plate to be used for placing battery cells, thereby improving the energy density of the battery.

[0025] In some embodiments, the reinforcement plate is integrally formed with the first side beam.

[0026] In the embodiment of the present application, the reinforcing plate and the first side beam are integrally formed, which can improve the connection reliability between the reinforcing plate and the first side beam and reduce the risk of connection failure due to external impact and other factors. In addition, during the battery preparation process, the reinforcing plate and the first side beam can be integrally formed so that the reinforcing plate and the first side beam are connected as a whole, and then the whole formed by the reinforcing plate and the first side beam is connected at a specific position of the load-bearing plate, thereby improving the position accuracy of the first side beam, the reinforcing plate and the load-bearing plate.

[0027] In a second aspect, an embodiment of the present application provides a battery, comprising a box body and a battery cell in any of the aforementioned embodiments, wherein the battery cell is accommodated in a receiving cavity and connected to a carrying area of ​​a carrying plate.

[0028] In some embodiments, the reinforcing plate at least partially overlaps the battery cells in a thickness direction of the carrying plate.

[0029] In the embodiment of the present application, the reinforcing plate at least partially overlaps with the battery cell, so that the reinforcing plate can also have a structural reinforcement effect on at least a portion of the area in the battery corresponding to the battery cell, further enhancing the structural strength of the battery.

[0030] In some embodiments, there are multiple battery cells, which form a battery pack, and a gap is provided between the battery pack and the side beam. In the thickness direction, the reinforcing plate is at least partially arranged opposite to the gap.

[0031] In the embodiment of the present application, the existence of the gap makes the structural strength of the battery at this position insufficient. Therefore, the embodiment of the present application sets the reinforcing plate at least partially relative to the gap, thereby improving the structural strength and compressive resistance of the battery at the gap position and reducing the risk of deformation or damage of the gap.

[0032] In some embodiments, the battery further comprises a heat management component, the heat management component being used to adjust the temperature of the battery cell. In the thickness direction, a projection of the heat management component at least partially overlaps with a projection of the reinforcing plate.

[0033] In an embodiment of the present application, the projection of the thermal management component and the projection of the reinforcement plate are at least partially overlapped, thereby improving the structural strength at this position, reducing the influence of external impact and other factors on the thermal management component, and improving the reliability and safety of the battery.

[0034] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery in any of the aforementioned embodiments, and the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application 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 creative work.

[0036] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0037] Figure 2 An exploded schematic diagram of a battery provided in some embodiments of the present application;

[0038] Figure 3 An exploded schematic diagram of a battery box provided in some embodiments of the present application;

[0039] Figure 4 A schematic diagram of the structure of a carrier plate in a battery provided in some embodiments of the present application;

[0040] Figure 5 A partial cross-sectional schematic diagram of a battery provided in some embodiments of the present application;

[0041] Figure 6 yes Figure 5 A partial enlarged view of the middle region Q;

[0042] Figure 7 It is a schematic diagram of the matching structure of the first side beam and the reinforcing plate in the battery provided in some embodiments of the present application.

[0043] In the drawings, the drawings are not drawn to scale.

[0044] In the attached figure:

[0045] 1000. Vehicles;

[0046] 100, battery; 200, controller; 300, motor; 400, box;

[0047] 11. Load-bearing plate; 12. Side beam; 121. First side beam; 122. Second side beam; 13. Reinforcement plate; 14. Accommodating cavity; 15. Base plate;

[0048] 20. Battery cells;

[0049] 30. Thermal management components; 31. Heat exchange plate; 32. Manifold;

[0050] A, bearing area; B, connection area; B1, first part; B2, second part; C, support area;

[0051] X, width direction; Y, length direction; Z, thickness direction. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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).

[0058] 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.

[0059] 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.

[0060] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can 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 application generally indicates that the associated objects before and after are in an "or" relationship.

[0061] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0062] The term "plurality" used in the present application refers to two or more (including two).

[0063] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0064] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0065] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the diaphragm may be polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly may be a winding structure or a laminated structure, and the embodiments of the present application are not limited thereto.

[0066] For electrical devices such as vehicles, the battery needs to be fixed at a fixed position of the electrical device. The applicant has noticed that during long-term use of the electrical device, the battery box is prone to deformation, which affects the normal use of the battery and causes safety risks.

[0067] The applicant has found that the above problem occurs because: inside the battery, the battery cells are fixed to the supporting plate of the box, and the battery cells are usually arranged in the central area of ​​the supporting plate. Therefore, the part of the supporting plate located in the central area can form a whole with the battery cells, thereby having a higher structural strength.

[0068] However, due to the limitations of the internal structure of the battery, there will be a certain amount of space between the battery cell and the side beam to accommodate other functional components of the battery. Furthermore, the edge area of ​​the load-bearing plate close to the side beam cannot be bonded to the battery cell. As a result, the structural strength of the edge area of ​​the load-bearing plate is weaker. Under the influence of external force and other factors, the edge area of ​​the load-bearing plate is more likely to be deformed or damaged than the central area, affecting the normal use of the battery.

[0069] Based on the above problems found by the applicant, the present application provides a battery box, a battery and an electrical device. The box includes a load-bearing plate, a side beam and a reinforcing plate. The load-bearing plate includes a load-bearing area and a connecting area, and the load-bearing area is used to place a battery cell. The side beam and the load-bearing plate are enclosed to form a receiving cavity for accommodating a battery cell, and the side beam is connected to the connecting area. At least part of the reinforcing plate overlaps with the connecting area in the thickness direction of the load-bearing plate and is connected to the connecting area.

[0070] The present application increases the thickness of the connection area by adding a reinforcing plate and at least partially overlapping the reinforcing plate with the connection area, thereby improving the structural strength of the battery at the connection area and reducing the risk of deformation or damage at the connection area due to external force impact and other factors.

[0071] The technical solutions described in the embodiments of the present application are applicable to electrical devices that use batteries, such as battery vehicles, electric vehicles, ships, spacecraft, electric toys and electric tools, etc., wherein spacecrafts include airplanes, rockets, space shuttles and spacecrafts, etc., electric toys include fixed or mobile electric toys, such as electric car toys, electric ship toys and electric airplane toys, etc., and electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0072] The battery cells described in the embodiments of the present application are not limited to being applicable to the electrical devices described above, but for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0073] See also Figure 1The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 may be provided inside the vehicle 1000. For example, the battery 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used, for example, to control the battery to power the motor 300. The battery may be used for starting and navigating the vehicle 1000. Of course, the battery 100 may also be used to drive the vehicle 1000, replacing or partially replacing fuel or natural gas to provide drive for the vehicle 1000.

[0074] See also Figure 2 The battery includes a box body 400 and a battery cell 20 , and the battery cell 20 is accommodated in a receiving cavity 14 of the box body 400 .

[0075] In the battery 100, there can be one or more battery cells 20. If there are more than one battery cell 20, the battery cells 20 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that the battery cells 20 are both connected in series and in parallel. The battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the battery cells 20 is accommodated in the box 400; of course, the battery cells 20 can also be connected in series, in parallel, or in a mixed connection to form a battery module (not shown in the figure), and then the battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the box 400.

[0076] The structure of the box body 400 is described in detail below with reference to the accompanying drawings.

[0077] The present application embodiment provides a battery box, see Figures 2 to 4 The box body includes a load-bearing plate 11, a side beam 12, and a reinforcing plate 13. The load-bearing plate 11 includes a load-bearing area A and a connecting area B, and the load-bearing area A is used to place the battery cell 20. The side beam 12 and the load-bearing plate 11 enclose a receiving cavity 14 for accommodating the battery cell 20, and the side beam 12 is connected to the connecting area B. At least part of the reinforcing plate 13 overlaps with the connecting area B in the thickness direction Z of the load-bearing plate 11 and is connected to the connecting area B.

[0078] The load-bearing plate 11 can be used as the bottom plate of the box or as the top plate of the box, which is not limited in the embodiment of the present application. For example, in a vehicle, the battery needs to be installed on the chassis of the vehicle, the battery can be installed upside down, and the load-bearing plate 11 is connected to the chassis of the vehicle by bolts or the like, so as to achieve mutual fixation between the battery and the vehicle.

[0079] It should be noted that the embodiment of the present application describes the load-bearing plate 11 as a part of the battery box, but in actual situations, the load-bearing plate 11 can also be a part of the vehicle, that is, the load-bearing plate 11 is prepared as a part of the vehicle chassis, and the embodiment of the present application does not limit this.

[0080] The load-bearing plate 11 and the side beam 12 are enclosed together to form a receiving cavity 14. The connection method between the load-bearing plate 11 and the side beam 12 includes but is not limited to bonding, welding, and bolt connection. The battery cell 20 is arranged in the receiving cavity 14 and placed on the load-bearing plate 11. The embodiment of the present application does not limit the number of battery cells 20 in the receiving cavity 14, and the number of battery cells 20 can be one or more.

[0081] The load-bearing plate 11 includes a load-bearing area A and a connection area B. The load-bearing area A of the load-bearing plate 11 and the connection area B of the load-bearing plate 11 can be integrally formed with the same material, or can be integrally connected with different materials through welding or other processes, and the embodiments of the present application are not limited to this.

[0082] The battery cell 20 is arranged in the carrying area A of the carrying plate 11. The size and shape of the carrying area A depend on the overall structural shape of all the battery cells 20 in the accommodating cavity 14. For example, the battery cell 20 is bonded to the carrying plate 11, the carrying area A is the area on the carrying plate 11 where the colloid needs to be applied, and the orthographic projection of the battery cell 20 on the carrying plate 11 is located in the carrying area A.

[0083] Exemplarily, the battery cell 20 is usually arranged in the center of the accommodating cavity 14, so the load-bearing area A is usually located in the center of the load-bearing plate 11. The connection area B is located outside the load-bearing area A, and the side beam 12 is connected to the connection area B of the load-bearing plate 11. The number of connection areas B can be one or more. When there are multiple connection areas B, at least one connection area B is connected to the reinforcing plate 13. Exemplarily, the number of connection areas B is four, and they are respectively arranged around the load-bearing area A.

[0084] The load-bearing plate 11 and the side beam 12 are connected and fixed, wherein the side beam 12 can be arranged perpendicular to the load-bearing plate 11 , or the angle between the side beam 12 and the load-bearing plate 11 can be set to an acute angle or an obtuse angle according to actual conditions.

[0085] The battery cell 20 is disposed in the supporting area A, but there is no battery cell 20 in the range of the accommodating cavity 14 corresponding to the connecting area B. Therefore, the supporting plate 11 in the connecting area B cannot be connected to the battery cell 20, resulting in poor structural strength of the supporting plate 11 in the connecting area B, which is prone to deformation or damage under the action of external force.

[0086] On this basis, the embodiment of the present application adds a reinforcing plate 13, which is used to improve the structural strength of the battery at the connection area B. Specifically, the reinforcing plate 13 is connected to the carrier plate 11, and the connection methods between the carrier plate 11 and the reinforcing plate 13 include but are not limited to bonding, welding, and bolting. The reinforcing plate 13 can be arranged on the side of the carrier plate 11 facing the accommodating cavity 14, or on the side of the carrier plate 11 away from the accommodating cavity 14, or the reinforcing plate 13 can be set as a U-shaped structure, so that part of the reinforcing plate 13 is located on the side of the carrier plate 11 facing the accommodating cavity 14, and part of it is located on the side of the carrier plate 11 away from the accommodating cavity 14.

[0087] At least part of the reinforcing plate 13 overlaps with the connection area B in the thickness direction Z of the carrier plate 11. The orthographic projection of the reinforcing plate 13 on the carrier plate 11 may be located in the connection area B, may overlap with the connection area B, or may cover and exceed the connection area B. The part of the reinforcing plate 13 overlapping with the connection area B can be connected to the connection area B of the carrier plate 11 as a whole, thereby increasing the total thickness at this position, thereby improving the structural strength and deformation resistance of the battery at the connection area B.

[0088] The number of reinforcing plates 13 may be one or more, and the embodiment of the present application does not limit the number of reinforcing plates 13. The orthographic projection of the reinforcing plate 13 on the carrier plate 11 may completely cover the carrier plate 11, or may only overlap with a part of the structure of the carrier plate 11. The embodiment of the present application does not limit the material of the reinforcing plate 13. Optionally, the reinforcing plate 13 may be made of the same material as the carrier plate 11, so that the reinforcing plate 13 and the carrier plate 11 can be integrated.

[0089] The embodiment of the present application does not limit the thickness of the reinforcing plate 13. The minimum thickness of the reinforcing plate 13 may be greater than, less than, or equal to the minimum thickness of the load-bearing plate 11. The embodiment of the present application also does not limit the specific position of the reinforcing plate 13, wherein the reinforcing plate 13 may be located at a position of the load-bearing plate 11 away from or close to the accommodating cavity 14. In addition to being connected to the connection area B, the reinforcing plate 13 may also be connected to structures such as the side beam 12.

[0090] In the embodiment of the present application, a reinforcing plate 13 is added, and the reinforcing plate 13 is at least partially overlapped with the connection area B, so as to increase the thickness at the connection area B, thereby improving the structural strength of the battery at the connection area B and reducing the risk of deformation or damage at the connection area B due to external force impact and other factors.

[0091] It should be noted that the box body may also include a base plate 15 spaced apart from the carrier plate 11 in the thickness direction Z. The carrier plate 11 , the side beam 12 and the base plate 15 together surround the accommodating cavity 14 , thereby protecting the battery cell 20 located in the accommodating cavity 14 .

[0092] In some embodiments, see Figures 4 to 6 The minimum thickness of the reinforcing plate 13 is H, 0.2 mm ≤ H ≤ 30 mm. Exemplarily, H is one of 0.2 mm, 1 mm, 5 mm, 10 mm and 30 mm.

[0093] The thickness of the reinforcing plate 13 at different positions may be the same or different. Exemplarily, the thickness of the reinforcing plate 13 at different positions may depend on the thickness of the supporting plate 11 at different positions. Specifically, when the thickness of the supporting plate 11 is uneven, there are areas of the supporting plate 11 with larger thickness or smaller thickness. For areas with larger thickness, the thickness of the reinforcing plate 13 at the corresponding position may be increased; for areas with smaller thickness, the thickness of the reinforcing plate 13 at the corresponding position may be reduced. In this way, the sum of the thickness of the reinforcing plate 13 and the thickness of the supporting plate 11 is kept consistent at different positions of the reinforcing plate 13, thereby improving the reliability of the battery structure.

[0094] When the thickness of the bearing plate 11 is kept consistent at all locations, alternatively, the thickness of the reinforcing plate 13 can also be made consistent at all locations. It should be noted that the "minimum thickness of the reinforcing plate 13 is H" mentioned in the embodiment of the present application refers to the minimum plate thickness at a specific position of the reinforcing plate 13. When the thickness of the reinforcing plate 13 is kept consistent at all locations, the minimum plate thickness H of the reinforcing plate 13 is the plate thickness at any position of the reinforcing plate 13.

[0095] The reinforcing plate 13 can improve the structural strength of the battery at the connection area B, and the thickness H is often positively correlated with the structural strength of the battery at the connection area B. If the thickness H is too small, it will have little effect on the thickness of the carrier plate 11 at the connection area B, that is, it will have little effect on the structural strength of the battery at the connection area B, and the battery at the connection area B is still prone to deformation or damage, which is not conducive to the long-term use of the battery.

[0096] If the thickness H is too large, although it can effectively improve the structural strength of the battery at the connection area B, the increase in thickness often means an increase in weight, which will increase the overall weight of the battery. Heavy batteries are not conducive to the lightweight design of the vehicle, nor are they conducive to the fixed connection between the battery and the vehicle chassis. In addition, if the reinforcing plate 13 is set in the accommodating cavity 14, the reinforcing plate 13 is too thick, which will cause it to occupy too much space, thereby affecting the space available for the battery cell 20, resulting in space waste, and the battery energy density is too low.

[0097] In the embodiment of the present application, H is set between 0.2 mm and 30 mm, which can improve the structural strength of the battery, reduce the risk of deformation or damage of the battery, and improve the reliability of the battery without greatly affecting the overall weight of the battery. Optionally, 0.5 mm ≤ H ≤ 10 mm. Exemplarily, H is one of 0.5 mm, 1 mm, 5 mm, 8 mm and 10 mm.

[0098] In some embodiments, the weight of the battery is M, and H and M satisfy: 0.0002 mm / kg≤H / M≤1 mm / kg. Exemplarily, H / M is one of 0.0002 mm / kg, 0.002 mm / kg, 0.05 mm / kg, 0.3 mm / kg, and 1 mm / kg.

[0099] The "battery weight M" mentioned in the embodiment of the present application refers to the total weight including the box body, the battery cell 20 and other components located in the accommodating cavity 14. The battery weight M is often positively correlated with the battery capacity, but as can be seen from the above content, the presence of the reinforcing plate 13 will also affect the battery weight M, so it is necessary to limit the relationship between the battery weight M and the weight of the reinforcing plate 13, that is, it is necessary to limit the relationship between the battery weight M and the minimum thickness H of the reinforcing plate 13.

[0100] If H / M is too small, it means that the thickness of the reinforcing plate 13 is too small relative to the entire battery, and cannot meet the requirement of enhancing the battery structure strength. If H / M is too large, it means that the weight of other structures in the battery except the reinforcing plate 13 is too light, and further, the weight of the battery cell 20 in the accommodating cavity 14 is too light, the battery capacity is too small, and the energy density is too low.

[0101] Therefore, in the embodiment of the present application, H / M is set between 0.0002mm / kg and 1mm / kg, which ensures that the battery has a high energy density while improving the structural strength of the battery and reducing the risk of deformation or damage of the battery under external impact. Optionally, 0.0006mm / kg≤H / M≤0.2mm / kg. Exemplarily, H / M is one of 0.0006mm / kg, 0.003mm / kg, 0.01mm / kg, 0.05mm / kg and 0.2mm / kg.

[0102] In some embodiments, the minimum thickness H of the reinforcing plate 13 is less than or equal to the minimum thickness of the carrying plate 11 .

[0103] The reinforcing plate 13 is connected to the carrier plate 11, and is used to increase the thickness of the battery at at least part of the carrier plate 11, thereby improving the structural strength of the battery. At the same time, the embodiment of the present application also takes into account the lightweight design of the battery, so the thickness H is set to be less than or equal to the minimum thickness of the carrier plate 11, so that the volume of the entire reinforcing plate 13 is the volume of the carrier plate 11, while improving the structural strength, the overall weight of the battery is reduced as much as possible. Optionally, the reinforcing plate 13 and the carrier plate 11 are made of the same material. This ensures that the weight of the reinforcing plate 13 is less than the weight of the carrier plate 11, which helps to lightweight the battery.

[0104] In some embodiments, Figure 5 and Figure 6 As shown, the reinforcing plate 13 is located on a side of the carrying plate 11 facing away from the accommodating cavity 14 .

[0105] The battery cell 20 is connected to the carrier plate 11 and is located in the accommodating cavity 14, and the reinforcing plate 13 is located on the side of the carrier plate 11 away from the accommodating cavity 14, that is, the battery cell 20 and the reinforcing plate 13 are respectively located on the two sides of the carrier plate 11, and the carrier plate 11 separates the battery cell 20 from the reinforcing plate 13. Since the reinforcing plate 13 is located on the side of the carrier plate 11 away from the accommodating cavity 14, the existence of the reinforcing plate 13 will not occupy the internal space of the accommodating cavity 14, and thus will not affect the space that the battery cell 20 can occupy in the accommodating cavity 14, that is, more or larger battery cells 20 can be arranged in the accommodating cavity 14.

[0106] In addition, for the battery preparation process, since the reinforcing plate 13 is located on the side of the carrier plate 11 away from the accommodating cavity 14, the battery can be produced according to the traditional preparation process, and then the reinforcing plate 13 is fixed to the carrier plate 11 by welding or bolting after the production is completed, so as to enhance the structural strength of the battery. Alternatively, the reinforcing plate 13 can be directly fixed on the vehicle chassis, and then the battery prepared by the traditional process is directly fixed on the reinforcing plate 13 located on the chassis to achieve a fixed connection between the vehicle and the battery. Regardless of the preparation method, it is only necessary to add a simple additional process in the traditional preparation process, so the difficulty of battery preparation can be reduced.

[0107] In summary, the embodiment of the present application arranges the reinforcing plate 13 on the side of the carrier plate 11 away from the accommodating cavity 14, so that the reinforcing plate 13 does not occupy the internal space of the accommodating cavity 14, that is, it does not affect the space available for the battery cell 20 in the accommodating cavity 14, thereby ensuring the energy density of the battery. At the same time, it can also reduce the difficulty of preparing the battery, which is conducive to large-scale production and preparation.

[0108] In some embodiments, Figures 2 to 4As shown, the connection area B includes a first portion B1 opposite to the accommodation cavity 14 along the thickness direction Z. In the thickness direction Z, the reinforcing plate 13 at least partially overlaps with the first portion B1.

[0109] The "first part B1 opposite to the accommodating cavity 14 along the thickness direction Z" mentioned in the embodiment of the present application means that the part where the orthographic projection of the accommodating cavity 14 overlaps with the connection area B on the support is the first part B1 of the connection area B. The position outline of the accommodating cavity 14 is indicated in the form of a dotted line in the figure. It should be noted that the range framed by the dotted line does not constitute a limitation on the position, shape and size of the accommodating cavity 14 in the embodiment of the present application. The specific structure of the accommodating cavity 14 needs to be determined according to the specific internal structure layout of the battery.

[0110] It can be seen from the foregoing that there is no battery cell 20 in the range of the accommodating cavity 14 corresponding to the connection area B. Furthermore, there is no battery cell 20 in the area of ​​the accommodating cavity 14 corresponding to the first part B1. Therefore, the first part B1 cannot be connected to the battery cell 20 as a whole by bonding or other means. Compared with other positions of the supporting plate 11, the first part B1 is more likely to be deformed or damaged under the influence of external force.

[0111] Therefore, in the embodiment of the present application, the reinforcing plate 13 and the first part B1 are at least partially overlapped, and the reinforcing plate 13 and the first part B1 can be connected to form a whole by bonding, welding, bolting, etc., thereby improving the structural strength and compressive resistance of the battery at the position of the first part B1 and reducing the risk of deformation or damage of the first part B1.

[0112] In some embodiments, the connection area B further includes a second portion B2 , and the second portion B2 overlaps and is connected to the side beam 12 along the thickness direction Z.

[0113] The second part B2 is located on the side of the first part B1 away from the bearing area A. The first part B1 and the second part B2 can be made of the same material or different materials. The thickness of the first part B1 can be the same as the thickness of the second part B2 or different from the thickness of the second part B2, which is not limited in the embodiment of the present application. For example, the first part B1 and the second part B2 are an integrated structure, both are made of the same material, and both have the same thickness.

[0114] The second portion B2 overlaps with the side beam 12 along the thickness direction Z, that is, the orthographic projection of the side beam 12 on the load-bearing plate 11 coincides with the second portion B2 of the connection area B, and the second portion B2 is used to achieve the connection between the load-bearing plate 11 and the side beam 12. During the preparation of the load-bearing plate 11, a plurality of mounting holes may be provided at the position of the second portion B2, and the load-bearing plate 11 and the side beam 12 may be fixed by bolt connection.

[0115] The second part B2 can be connected to the side beam 12 to form a whole. Therefore, the existence of the side beam 12 can improve the structural strength of the battery at the position of the second part B2, reduce the risk of deformation or damage of the second part B2 under the action of external force, and improve the overall reliability of the battery.

[0116] It should be noted that the reinforcing plate 13 is at least partially overlapped with the first part B1. For the second part B2, due to the existence of the side beam 12, a reinforcing plate 13 may or may not be provided at the position of the second part B2, that is, the orthographic projection of the reinforcing plate 13 on the supporting plate 11 may overlap with the first part B1 or may be staggered, and the embodiments of the present application do not impose any restrictions on this.

[0117] In some embodiments, in the thickness direction Z, the load-bearing area A at least partially overlaps with the reinforcing plate 13 .

[0118] The battery cell 20 is arranged on the bearing area A of the bearing plate 11. The presence of the battery cell 20 can enhance the structural strength of the battery at the bearing area A. Usually, there is a colloid between the battery cell 20 and the bearing plate 11 to achieve relative fixation between the two. When the vehicle is running on rugged or other dangerous terrain, the bearing plate 11 will vibrate and transmit it to the battery cell 20 to make it shake together. After a certain period of time, the colloid between the bearing plate 11 and the battery cell 20 can hardly ensure the reliability of the relative position of the two.

[0119] In this case, the embodiment of the present application overlaps the load-bearing area A with the reinforcing plate 13 at least partially, so that the reinforcing plate 13 can increase the overall thickness of at least part of the load-bearing area A, thereby reducing the impact of vibration, reducing the risk of debonding between the load-bearing plate 11 and the battery cell 20, and improving the reliability of the relative position between the load-bearing plate 11 and the battery cell 20. At the same time, the reinforcing plate 13 can also improve the structural strength of at least part of the load-bearing area A, thereby reducing the impact of external impact and other factors on the battery cell 20.

[0120] In some embodiments, the reinforcement plate 13 is connected to the side beam 12 .

[0121] The side beam 12 is connected to the load-bearing plate 11, and the positions of the two are kept relatively fixed. On this basis, by connecting the reinforcing plate 13 to the side beam 12, the reinforcing plate 13 and the side beam 12 are kept fixed, thereby improving the reliability of the relative position between the reinforcing plate 13 and the load-bearing plate 11. The connection method between the reinforcing plate 13 and the side beam 12 includes but is not limited to welding, bonding, and bolt connection.

[0122] It should be noted that the embodiment of the present application does not limit the specific connection position between the reinforcing plate 13 and the side beam 12. Specifically, the reinforcing plate 13 can be set on the surface of the load-bearing plate 11 facing the side beam 12, and then the reinforcing plate 13 can be fixed to the bottom of the side beam 12. Alternatively, the reinforcing plate 13 can also be set as an L-shaped structure, and the reinforcing plate 13 includes two vertically arranged parts, one of which is located on the side of the load-bearing plate 11 away from the side beam 12, and the other is located on the side of the side beam 12 away from the accommodating cavity 14 and is fixedly connected to the side beam 12.

[0123] In addition, during the battery preparation process, the reinforcing plate 13 and the side beam 12 may be connected and fixed first, and then the reinforcing plate 13 and the side beam 12 may be installed on the load-bearing plate 11 as a whole, so as to ensure the reliability of the relative position between the reinforcing plate 13 and the side beam 12. Alternatively, the reinforcing plate 13 may be installed on the load-bearing plate 11 first, and then the side beam 12 may be fixed to the reinforcing plate 13, so as to improve the reliability of the connection between the load-bearing plate 11 and the side beam 12 through the reinforcing plate 13.

[0124] In some embodiments, see Figure 2 , Figure 3 as well as Figure 7 There are multiple side beams 12 , and the multiple side beams 12 are arranged along the circumference of the load-bearing plate 11 , and the reinforcing plate 13 is connected to at least one side beam 12 .

[0125] The plurality of side beams 12 and the bearing plate 11 are enclosed together to form a receiving cavity 14. For example, there are four side beams 12, which are connected end to end and together form a square ring structure. Adjacent side beams 12 can be connected by welding, bonding, bolting, etc., and only some of the plurality of side beams 12 can be fixedly connected to the bearing plate 11, or all of the side beams 12 can be fixedly connected to the bearing plate 11, which is not limited in the embodiment of the present application.

[0126] The number of the reinforcing plates 13 may be one or more, and at least one reinforcing plate 13 is connected and fixed to at least one side beam 12. Exemplarily, the number of reinforcing plates 13 corresponds to the number of side beams 12, and the plurality of reinforcing plates 13 are also arranged along the circumference of the load-bearing plate 11, and the plurality of reinforcing plates 13 correspond to the positions of the plurality of side beams 12, and the corresponding reinforcing plates 13 and side beams 12 are connected to each other.

[0127] In the embodiment of the present application, a plurality of side beams 12 are connected end to end in sequence to form a closed loop structure, and the plurality of side beams 12 are arranged around the outer periphery of the accommodating cavity 14. At the same time, the reinforcing plate 13 is connected to at least one of the side beams 12 to improve the reliability of the relative positions among the side beams 12, the reinforcing plate 13 and the load-bearing plate 11, so as to ensure the stability of the overall structure of the battery under different working conditions.

[0128] In some embodiments, Figure 3 and Figure 7 As shown, the plurality of side beams 12 include two first side beams 121 and two second side beams 122, the two first side beams 121 are arranged along the width direction X, and the two second side beams 122 are arranged along the length direction Y, and the width direction X intersects the length direction Y. Each second side beam 122 connects the two first side beams 121, and there are two reinforcing plates 13, which are arranged at intervals along the width direction X and are respectively connected to the two first side beams 121.

[0129] The second side beam 122 is used to connect and fix the two first side beams 121 that are spaced apart. The two first side beams 121 are spaced apart along the width direction X and both extend along the length direction Y. The two second side beams 122 are spaced apart along the length direction Y and both extend along the width direction X. Exemplarily, the width direction X is perpendicular to the length direction Y.

[0130] Due to the limitation of the internal structure of the battery, the distance between the battery cell 20 and the first side beam 121 is too large. Figure 2 As shown, the accommodating cavity 14 includes not only the battery cell 20 but also a thermal management component 30 . The thermal management component 30 is used to adjust the temperature of the battery cell 20 inside the battery to ensure that the battery cell 20 can maintain a suitable temperature for operation.

[0131] The thermal management component 30 includes a heat exchange plate 31 and a manifold 32 for connecting multiple heat exchange plates 31. The heat exchange plate 31 is attached to or arranged adjacent to the battery cell 20 and is the main component for adjusting the temperature of the battery cell 20. There is usually a channel for fluid to pass through the heat exchange plate 31. When the battery needs to cool down, cold fluid can be transported to the heat exchange plate 31. The cold fluid flows in the channel and takes away part of the heat of the battery cell 20, thereby achieving a cooling operation. When the battery needs to heat up, hot fluid can be transported to the heat exchange plate 31. The hot fluid flows in the channel and provides part of the heat to the corresponding battery cell 20, thereby achieving a heating operation.

[0132] The manifold 32 is connected to the channel of the heat exchange plate 31, and is used to transport or transfer hot and cold fluids to one or more heat exchange plates 31. The manifold 32 is usually located between the battery cell 20 and the first side beam 121. Due to the presence of the manifold 32, the distance between the battery cell 20 and the first side beam 121 is too large, so that the width of the connection area B is too large, and the battery is easily deformed or damaged at the connection area B between the battery cell 20 and the first side beam 121.

[0133] Therefore, in the embodiment of the present application, two reinforcing plates 13 are provided, and the two reinforcing plates 13 are respectively connected to the two first side beams 121 , thereby being able to improve the structural strength of the connection area B in the load-bearing plate 11 corresponding to the battery cell 20 and the first side beam 121 .

[0134] In addition, the two reinforcing plates 13 in the embodiment of the present application are two small plates arranged at intervals, that is, the orthographic projections of the two reinforcing plates 13 on the carrier plate 11 will only overlap with part of the structure in the carrier plate 11. Compared with the solution of setting the reinforcing plates 13 to cover the entire carrier plate 11, this design can reduce the overall weight of the reinforcing plates 13 while improving the structural strength of the battery, thereby facilitating the lightweight design of the battery.

[0135] It should be noted that the embodiment of the present application does not limit the size of the two reinforcing plates 13 and the spacing between them. Figure 4 and Figure 7 As shown, the orthographic projections of the two reinforcing plates 13 on the bearing plate 11 coincide with the first portion B1 , and the distance between the two reinforcing plates 13 is the size of the bearing area A in the width direction X.

[0136] In some embodiments, the reinforcing plate 13 has a supporting area C, and the supporting area C overlaps with the thickness direction Z of the carrying plate 11 .

[0137] In the embodiment of the present application, “the support area C overlaps with the carrier plate 11 in the thickness direction Z” means that the part of the reinforcement plate 13 where the orthographic projection on the carrier plate 11 overlaps with the carrier plate 11 is the support area C of the reinforcement plate 13, and the support area C in the reinforcement plate 13 is mainly used to improve the structural strength at a specific position in the carrier plate 11.

[0138] It should be noted that, depending on the structure of the reinforcing plate 13, the reinforcing plate 13 may be entirely the support area C, or may include other parts except the support area C. For example, Figure 3 and Figure 7 As shown, when the reinforcing plate 13 is entirely located on the side of the bearing plate 11 away from the accommodating cavity 14, and all the orthographic projections of the reinforcing plate 13 on the bearing plate 11 are located within the outer contour of the bearing plate 11, the reinforcing plate 13 is entirely the supporting area C. Alternatively, when the reinforcing plate 13 is an L-shaped structure as mentioned in the above embodiment, the portion of the reinforcing plate 13 located on the side of the bearing plate 11 away from the accommodating cavity 14 is the supporting area C, and the portion of the reinforcing plate 13 located on the side of the side beam 12 away from the accommodating cavity 14 is the portion of the reinforcing plate 13 other than the supporting area C.

[0139] In some embodiments, a portion of the load-bearing plate 11 is located between the first side beam 121 and the reinforcing plate 13 , and is connected to the first side beam 121 and the reinforcing plate 13 .

[0140] The “a portion of the load-bearing plate 11 is located between the first side beam 121 and the reinforcing plate 13” mentioned in the embodiment of the present application means that part of the structure in the load-bearing plate 11 is located between the first side beam 121 and the reinforcing plate 13 in the thickness direction Z of the load-bearing plate 11, that is, the orthographic projections of the first side beam 121 and the reinforcing plate 13 on the load-bearing plate 11 at least partially overlap.

[0141] The load-bearing plate 11 separates the first side beam 121 from the reinforcing plate 13, and has two opposite surfaces in the thickness direction Z, one of which is disposed toward the side beam 12 and can be fixed to the side beam 12 by welding or bonding. The other surface is disposed toward the reinforcing plate 13 and can also be fixed to the reinforcing plate 13 by welding or bonding.

[0142] The embodiment of the present application controls the relative position relationship between the first side beam 121 and the reinforcing plate 13 so that a portion of the load-bearing plate 11 can be simultaneously located between the first side beam 121 and the reinforcing plate 13, and the load-bearing plate 11 can simultaneously achieve the connection between the load-bearing plate 11, the reinforcing plate 13 and the first side beam 121 through this portion. Compared with the solution in which the first side beam 121 and the reinforcing plate 13 are installed on the load-bearing plate 11 in a staggered manner, this design can allow more areas on the load-bearing plate 11 to be used for placing the battery cells 20, thereby improving the energy density of the battery.

[0143] In some embodiments, the reinforcing plate 13 and the first side beam 121 are integrally formed.

[0144] The reinforcing plate 13 and the first side beam 121 are integrally formed, which can improve the connection reliability between the reinforcing plate 13 and the first side beam 121 and reduce the risk of connection failure due to external impact and other factors. In the battery preparation process, the reinforcing plate 13 and the first side beam 121 can be integrally formed first, so that the reinforcing plate 13 and the first side beam 121 are connected to form a whole, and then the whole formed by the reinforcing plate 13 and the first side beam 121 is connected to a specific position of the load-bearing plate 11, so that the position accuracy of the first side beam 121, the reinforcing plate 13 and the load-bearing plate 11 can be improved.

[0145] It should be noted that in the embodiment of the present application, the reinforcing plate 13 and the first side beam 121 can be made of the same material, and the supporting plate 11 can be made of the same or different material as the first side beam 121, and the embodiment of the present application does not impose any limitation on this.

[0146] In some embodiments, the material of the reinforcing plate 13 includes at least one of steel and aluminum alloy.

[0147] Both steel and aluminum alloy are materials with strong structural strength, and compared with other materials, steel and aluminum alloy can greatly reduce the overall weight of the reinforcing plate 13 while ensuring structural strength, thereby reducing the overall weight of the battery and contributing to the lightweight design of the battery.

[0148] In a second aspect, the present application provides a battery, such as Figure 2 and Figure 4 As shown, the battery includes a box body in any of the above embodiments and a battery cell 20 . The battery cell 20 is accommodated in the accommodation cavity 14 and connected to the carrying area A of the carrying plate 11 .

[0149] It should be noted that the battery provided in the embodiment of the present application can have the beneficial effects of the box in any of the aforementioned embodiments. Please refer to the aforementioned description of the beneficial effects of the box for details, and the embodiment of the present application will not be repeated here.

[0150] In some embodiments, the battery cell 20 is bonded to the supporting area A.

[0151] A colloid is provided between the battery cell 20 and the carrier plate 11, and the area where the colloid is applied on the carrier plate 11 is usually the carrier area A of the carrier plate 11. The colloid is used to achieve fixation between the battery cell 20 and the carrier plate 11, and during the bonding process, part of the colloid usually overflows from both sides of the battery and fills into the area between the battery cell 20 and the side beam 12. This part of the colloid can achieve bonding and fixation between the battery cell 20 and the side beam 12 to a certain extent, thereby improving the reliability of the battery structure.

[0152] In some embodiments, in the thickness direction Z of the carrier plate 11 , the reinforcing plate 13 at least partially overlaps the battery cells 20 .

[0153] In the embodiment of the present application, “the reinforcing plate 13 and the battery cell 20 at least partially overlap” means that the orthographic projection of the reinforcing plate 13 on the carrier plate 11 and the orthographic projection of the battery cell 20 on the carrier plate 11 at least partially overlap.

[0154] As can be seen from the foregoing, the reinforcing plate 13 is used to enhance the structural strength of the battery at the connection area B, that is, to enhance the structural strength of the area between the battery cell 20 and the side beam 12. On this basis, the embodiment of the present application also at least partially overlaps the reinforcing plate 13 with the battery cell 20, so that the reinforcing plate 13 can also have a structural reinforcement effect on at least a portion of the area in the battery corresponding to the battery cell 20, further enhancing the structural strength of the battery.

[0155] In some embodiments, there are multiple battery cells 20, and the multiple battery cells 20 form a battery pack, and a gap is provided between the battery pack and the side beam 12. In the thickness direction Z, at least a portion of the reinforcing plate 13 is disposed opposite to the gap.

[0156] A plurality of battery cells 20 are connected in series, in parallel or in a mixed manner to form a battery pack. Generally, the battery pack is spaced apart from the side beam 12 to form a gap for avoiding internal components of the battery.

[0157] The phrase "at least part of the reinforcing plate 13 is arranged opposite to the gap in the thickness direction Z" mentioned in the embodiment of the present application means that the orthographic projection of the gap on the carrier plate 11 and the orthographic projection of the reinforcing plate 13 on the carrier plate 11 at least partially overlap. The gap corresponds to the first part B1 in the carrier plate 11.

[0158] In addition, the embodiment of the present application does not limit the number and specific shape and size of the gaps. For example, the number of gaps is four and they are arranged around the battery pack.

[0159] The existence of the gap makes the structural strength of the battery at this position insufficient. Therefore, in the embodiment of the present application, at least a portion of the reinforcing plate 13 is arranged relative to the gap, thereby improving the structural strength and compressive resistance of the battery at the gap position and reducing the risk of deformation or damage to the gap.

[0160] In some embodiments, the battery further includes a heat management component 30, which is used to adjust the temperature of the battery cell 20. In the thickness direction Z, the projection of the heat management component 30 at least partially overlaps with the projection of the reinforcing plate 13.

[0161] As can be seen from the foregoing, the battery pack and the side beam 12 are spaced apart to form a gap for avoiding the internal components of the battery. For example, the thermal management component 30 includes a plurality of heat exchange tubes and a manifold 32 connecting the plurality of heat exchange tubes. The manifold 32 is located in the gap between the battery pack and the side beam 12. It should be noted that the number of manifolds 32 may be the same as the number of gaps, or may be different from the number of gaps, that is, the manifold 32 may not be provided in some gaps. The specific structure needs to be determined according to the actual situation of the battery, and the embodiment of the present application does not limit this.

[0162] The thermal management component 30 is at least partially located in the gap. If the structural strength of the battery at the position corresponding to the gap is insufficient, then under the influence of external impact and other factors, the deformation or damage of the supporting plate 11 may easily have an adverse effect on the thermal management component 30, resulting in a decrease in the overall temperature regulation effect of the battery, which may easily cause safety hazards.

[0163] Therefore, in the embodiment of the present application, the projection of the thermal management component 30 and the projection of the reinforcing plate 13 are at least partially overlapped, thereby improving the structural strength at this position, reducing the influence of external impact and other factors on the thermal management component 30, and improving the reliability and safety of the battery.

[0164] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery in any of the aforementioned embodiments, and the battery is used to provide electrical energy.

[0165] It should be noted that the electrical device provided in the embodiment of the present application has the beneficial effects of the battery in any of the aforementioned embodiments. Please refer to the aforementioned description of the beneficial effects of the battery for details, and the embodiment of the present application will not be repeated.

[0166] According to some embodiments provided by this application, Figures 2 to 5 As shown, the battery includes a box body and a battery cell 20 and a thermal management component 30 located in the box body. The box body includes a load-bearing plate 11, a side beam 12 and a reinforcing plate 13. The side beam 12 and the load-bearing plate 11 enclose a receiving cavity 14 for accommodating multiple battery cells 20 and the thermal management component 30. The load-bearing plate 11 includes a load-bearing area A and a connecting area B. The connecting area B includes a first part B1 and a second part B2 located on a side of the first part B1 away from the load-bearing area A. The side beam 12 is connected to the second part B2.

[0167] A plurality of battery cells 20 together constitute a battery pack, which is bonded to the bearing area A of the bearing plate 11. There is a gap between the battery pack and the side beam 12. The thermal management component 30 is at least partially located in the gap, and the orthographic projection of the gap on the bearing plate 11 overlaps with the first part B1.

[0168] There are two reinforcing plates 13 , which are spaced apart in the width direction X, and the orthographic projection of the reinforcing plates on the carrier plate 11 at least partially overlaps with the first portion B1 .

[0169] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0170] 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 it. 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 make equivalent replacements for some of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery box, characterized in that: include: A load-bearing plate, comprising a load-bearing area and a connection area, wherein the load-bearing area is used to place a battery cell, the load-bearing area is located at the center of the load-bearing plate, and the connection area is located outside the load-bearing area; A side beam, which, together with the load-bearing plate, forms a receiving cavity for receiving the battery cell, and the side beam is connected to the connecting area; as well as, A reinforcing plate, at least a portion of which overlaps with the connecting area in the thickness direction of the carrying plate and is connected to the connecting area.

2. The box according to claim 1, characterized in that: The minimum thickness of the reinforcing plate is H, 0.2mm≤H≤30mm.

3. The box according to claim 2, characterized in that: 0.5mm≤H≤10mm.

4. The box according to any one of claims 1 to 3, characterized in that: The minimum thickness of the reinforcing plate is H, the weight of the battery is M, and H and M satisfy: 0.0002mm / kg≤H / M≤1mm / kg.

5. The box according to claim 4, characterized in that: H and M satisfy: 0.0006mm / kg≤H / M≤0.2mm / kg.

6. The box according to any one of claims 1 to 5, characterized in that: The minimum thickness of the reinforcing plate is less than or equal to the minimum thickness of the bearing plate.

7. The box according to claim 1, characterized in that: The reinforcing plate is located on a side of the carrying plate that is away from the accommodating cavity.

8. The box according to claim 1, characterized in that: In the thickness direction, the load-bearing area at least partially overlaps with the reinforcing plate.

9. The box according to claim 1, characterized in that: The reinforcement plate is connected to the side beam.

10. The box according to claim 9, characterized in that: There are multiple side beams, and the multiple side beams are arranged along the circumference of the bearing plate; The reinforcement plate is connected to at least one of the side beams.

11. The box according to claim 10, characterized in that: The plurality of side beams include two first side beams and two second side beams, the two first side beams are arranged at intervals along the width direction of the box body, the two second side beams are arranged at intervals along the length direction of the box body, and each second side beam connects the two first side beams; There are two reinforcing plates, which are spaced apart along the width direction and respectively connected to the two first side beams.

12. The box according to claim 11, characterized in that: A portion of the load-bearing plate is located between the first side beam and the reinforcing plate, and is connected to the first side beam and the reinforcing plate.

13. The box according to claim 11, characterized in that: The reinforcing plate is integrally formed with the first side beam.

14. A battery, characterized in that: include: The box according to any one of claims 1 to 13; as well as The battery cell is accommodated in the accommodation cavity and connected to the carrying area of ​​the carrying plate.

15. The battery according to claim 14, characterized in that The reinforcing plate at least partially overlaps the battery cell in a thickness direction of the carrying plate.

16. The battery according to claim 14 or 15, characterized in that: There are multiple battery cells, and multiple battery cells constitute a battery pack; A gap is provided between the battery pack and the side beam; In the thickness direction, at least a portion of the reinforcing plate is disposed opposite to the gap.

17. The battery according to claim 14, characterized in that Also included is a thermal management component, the thermal management component is used to regulate the temperature of the battery cell; In the thickness direction, a projection of the heat management component at least partially overlaps a projection of the reinforcement plate.

18. An electrical device, characterized in that: The invention comprises a battery according to any one of claims 14 to 17, wherein the battery is used to provide electrical energy.

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