Battery devices, electrical devices and energy storage devices

Abstract

This application provides a battery device, an electrical device, and an energy storage device. It relates to the field of battery technology. The battery device includes: a housing defining a receiving cavity, the housing having an opening facing a first direction; a cover connected to the housing and closing the opening along the first direction; at least one battery cell assembly housed in the receiving cavity; and at least one rigid member, each rigid member including a rigid member body and a rigid member connecting portion, the rigid member connecting portion connecting to both ends of the rigid member body, the rigid member body being embedded in the cover, and the rigid member connecting portion at least partially exposed from the cover and respectively connected to the housing. This aims to reduce the production cost of the battery box while enhancing its mechanical strength.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device, an electrical device, and an energy storage device. Background Technology

[0002] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, battery devices are being used more and more in the field of energy storage.

[0003] In existing battery systems, battery devices typically include a battery box and individual battery cells located within the box. To suppress deformation of the battery box, a solution exists to install rigid components on the outside of the box. However, the surface of these rigid components usually requires anti-corrosion treatment or the use of corrosion-resistant metals such as stainless steel, resulting in high production costs. Therefore, balancing the suppression of battery box deformation with the reduction of production costs is one of the research directions in the industry. Summary of the Invention

[0004] To address the aforementioned technical problems, embodiments of this application provide a battery device, an electrical device, and an energy storage device, which simultaneously suppress the deformation of the battery casing and reduce the production cost of the battery casing.

[0005] The embodiments of this application are implemented through the following technical solutions.

[0006] A first aspect of this application provides a battery device, comprising: a housing defining a receiving cavity, the housing having an opening facing a first direction; a cover connected to the housing and closing the opening along the first direction; at least one battery cell assembly housed in the receiving cavity; and at least one rigid member, each rigid member including a rigid member body portion and a rigid member connecting portion, the rigid member connecting portion being connected to both ends of the rigid member body portion, the rigid member body portion being embedded in the cover body, and the rigid member connecting portion being at least partially exposed from the cover body and respectively connected to the housing.

[0007] Because the rigid component is embedded within the cover, it enhances the strength and rigidity of the cover, suppressing deformations such as bulging or concavity along the first direction, and also inhibiting deformation of the battery casing. For example, when some battery cells in a battery assembly experience thermal runaway and release gas, leading to an increase in gas within the battery casing, the rigid component can suppress the probability of the cover bulging or even breaking due to this gas. It can also reduce the probability or degree of casing deformation caused by cover deformation, improving the dimensional accuracy of the battery device's outer contour and enhancing its appearance. Furthermore, during the gas filling test phase of battery assembly, the step of pressing the cover to prevent bulging and deformation, along with the corresponding tooling, can be eliminated, reducing production costs and increasing efficiency. Additionally, because the cover encloses the rigid component's main body, reducing the contact area between the main body and the outside environment, the probability of corrosion is reduced even without anti-corrosion measures. Moreover, its simple manufacturing process further reduces production costs.

[0008] In some embodiments, the cover includes a first cover portion and a second cover portion connected along a first direction, with a cavity formed between the first cover portion and the second cover portion; the rigid member body portion is located in the cavity and the first cover portion and the second cover portion cover the circumferential surface of the rigid member body portion.

[0009] Since the main body of the rigid component is located in the cavity and the first cover portion and the second cover portion cover the circumferential surface of the main body of the rigid component, the contact area between the rigid component and the external environment can be greatly reduced, the probability of corrosion of the main body of the rigid component is reduced, and thus the degree of corrosion of the rigid component is reduced.

[0010] In some embodiments, the cover is formed to have a uniform thickness, the thickness direction being consistent with the first direction.

[0011] Thus, the cover can be formed into a shape in which both sides opposite each other along the first direction are flat or substantially flat.

[0012] In some embodiments, the cover is formed having a thin-walled portion and a plurality of locally thickened portions. In at least one locally thickened portion, a first cover portion, a rigid body portion, and a second cover portion are stacked along the thickness direction, which is consistent with the first direction.

[0013] Therefore, the thickness of the cover can be increased at the location where rigid components are arranged, which helps to suppress the overall thickness of the cover, thereby reducing the weight and material cost of the cover and even the battery device.

[0014] In some embodiments, the cover is configured as an insulating cover.

[0015] Therefore, even without insulating the rigid components (e.g., by adding an insulating coating), the insulation problem of the rigid components can be solved, and the manufacturing process can be reduced accordingly, thus lowering the production cost of the battery device.

[0016] In some embodiments, the cover is made of a resin material; or, the cover is made of a metal material with an insulating layer.

[0017] The cover is made of resin, which not only improves the lightweight nature of the cover and thus the battery device, but also provides insulation, thus eliminating the need for separate insulation treatment of rigid components and the cover itself. Because the cover is made of a metal material with an insulating layer, it possesses high strength and rigidity. Furthermore, the insulating layer on the metal material ensures that the outer surface of the cover is insulated.

[0018] In some embodiments, at least one battery cell assembly includes a plurality of battery cells arranged along a second direction; the housing includes a first housing wall disposed opposite to each other along the second direction, and rigid member connecting portions are respectively connected to the first housing wall, the second direction intersecting the first direction.

[0019] Since the rigid components are connected to the first housing wall, the first housing wall can clamp the battery cell assembly along the second direction under the tension of the rigid components, so that the battery cell assembly is kept in a regular arrangement, thereby suppressing the deformation of the housing due to the expansion and outward extension of the battery cell assembly.

[0020] In some embodiments, the battery cell includes a housing that defines an accommodating space by connected housing walls, wherein a large housing wall is perpendicular to a second direction, and the large housing wall is the housing wall with the largest area among the housing walls.

[0021] The large surface area of ​​the battery cell is prone to expansion and deformation due to the charging and / or discharging of the battery cell. Since the large surface area of ​​the battery cell is perpendicular to the second direction, it can be subjected to a large clamping force along the second direction. This reduces the probability or degree of deformation of the large surface area of ​​the battery cell caused by the expansion of the battery cell during charging and / or discharging, thereby reducing the probability or degree of deformation of the battery device.

[0022] In some embodiments, the rigid member connection portion is bent relative to the rigid member body portion along a second direction, and the rigid member connection portion is located on the side of the first housing wall away from the battery cell assembly. The battery device also includes a first connector that connects the rigid member connection portion and the first housing wall.

[0023] Therefore, the rigid component connecting parts can be connected to the first housing wall respectively.

[0024] In some embodiments, along a first direction, the rigid member connection is located on the side of the first housing wall near the cover, and the battery device further includes a second connector that connects the rigid member connection and the first housing wall.

[0025] Therefore, the rigid component connecting parts can be connected to the first housing wall respectively.

[0026] In some embodiments, the rigid member connection portion is built into the cover, the rigid member connection portion is formed with a connection hole, the cover is formed with a connection clearance hole, and the battery device further includes a third connector, the third connector is disposed through the connection clearance hole and the connection hole, connects the rigid member connection portion to the first housing wall, and the third connector contacts the side of the rigid member connection portion away from the battery cell assembly along a first direction.

[0027] Therefore, the rigid component connecting parts can be connected to the first housing wall respectively. Furthermore, since the rigid component connecting parts are built into the cover, as much of the rigid component as possible can be located within the cover, improving the corrosion resistance and reliability of the rigid component. Because the cover has connection clearance holes, the third connector contacts the side of the rigid component connecting part opposite to the battery cell assembly along the first direction. Therefore, the risk of insufficient fastening due to cover deformation can be reduced. For example, in the case where the cover is made of resin material, the risk of loosening or other defects caused by cover creep at the connection between the third connector and the rigid component connecting part can be reduced.

[0028] In some embodiments, a plurality of battery cell assemblies are arranged along a third direction, and a plurality of rigid members are arranged along a third direction, with the first direction, the second direction, and the third direction intersecting each other; in the projection plane projected along the first direction, the projection of each battery cell assembly overlaps with the projection of the main body portion of at least one rigid member.

[0029] Therefore, the expansion force of the battery cell assembly can be evenly borne by multiple rigid components, which can reliably reduce the probability or degree of expansion of the battery cell assembly due to charging and / or discharging, thereby reducing the probability or degree of deformation of the battery device.

[0030] In some embodiments, within a projection plane projected along a first direction, the projection of at least one rigid member body portion overlaps with the projections of two adjacent battery cell assemblies along a third direction.

[0031] Therefore, at least some of the battery cells are subjected to the binding force of the rigid member at both ends along the third direction, so that the battery cell assembly can be clamped evenly and reliably, further reducing the probability of the battery cell assembly expanding due to charging and / or discharging or mitigating the degree of expansion of the battery cell assembly due to charging and / or discharging, thereby further reducing the probability of battery device deformation or mitigating the degree of battery device deformation.

[0032] In some embodiments, the cover is formed having a thin-walled portion and a plurality of locally thickened portions, the plurality of locally thickened portions including a first locally thickened portion that protrudes relative to the thin-walled portion toward a side closer to the battery cell assembly, the first locally thickened portion being in contact with the battery cell assembly.

[0033] The first partial thickening portion can enhance the strength and rigidity of the cover, improving its ability to resist deformation. Furthermore, since the first partial thickening portion is in contact with the battery cell assembly, it can apply pressure along the first direction to the battery cell assembly, fixing their relative positions and reducing the probability of them swaying or misaligning along the first direction.

[0034] In some embodiments, a plurality of battery cell assemblies are arranged along a third direction; the same first partial thickening portion contacts the shoulders of two adjacent battery cell assemblies arranged along the third direction, and the first direction, the second direction and the third direction intersect each other.

[0035] Thus, a first partial thickening portion can position the two battery cell assemblies along the first direction, simplifying the structure of the cover and thereby simplifying the structure of the battery device.

[0036] In some embodiments, in at least one first partial thickening portion, a first cover portion, a rigid body portion, and a second cover portion are stacked along the thickness direction, which is consistent with the first direction.

[0037] Since the first cover portion, the rigid body portion, and the second cover portion are stacked along the thickness direction in at least one first partial thickening portion, the strength and rigidity of the first partial thickening portion of the cover can be enhanced, the strength and rigidity of the cover can be further strengthened through the first partial thickening portion, and the ability of the cover to resist deformation can be improved; moreover, the first partial thickening portion can be reliably pressed onto the battery cell.

[0038] In some embodiments, the first partial thickening portion is bonded to the battery cell assembly.

[0039] Because the first partial thickening is bonded to the battery cell assembly, multiple battery cell assemblies and the cover form a single unit, increasing the stiffness of the battery device along a third direction and reducing the probability or degree of deformation along the first direction. Furthermore, for example, when the cover is the top cover of the battery device, the bonding of the first partial thickening to the battery cell assembly allows it to apply tensile force along the first direction to the battery cell assembly, reducing the pressure of the battery cell assembly on the lower load-bearing components of the casing. This improves the overall structural strength and stiffness of the casing, facilitating designs that reduce casing strength, such as thinning the casing or reducing reinforcing beams, to achieve cost and weight reduction. Moreover, because the first partial thickening is bonded to the battery cell assembly, the relative positions of the battery cell assemblies in the third direction are fixed.

[0040] In some embodiments, a plurality of battery cell assemblies are arranged along a third direction, each battery cell assembly including at least one battery cell having a pressure relief valve disposed toward the cover; a plurality of first partial thickening portions are arranged along a third direction, and along the first direction, there is a gap between the pressure relief valve and the thin-walled portion, and in the same projection plane projected along the first direction, the projection of the pressure relief valve is located between the projections of adjacent first partial thickening portions.

[0041] Because there is a gap between the pressure relief valve and the thin-walled portion, and the projection of the pressure relief valve is located between the projections of adjacent first partial thickening portions in the same projection plane along the first direction, the adjacent first partial thickening portions, the thin-walled portions, and the battery cell assembly along the third direction can define a pressure relief channel. The gas released by the pressure relief valve being opened can flow directionally along the pressure relief channel, reducing the probability that the gas released by the pressure relief valve being opened will damage the battery device.

[0042] In some embodiments, the housing includes a second housing wall opposite to the cover in a first direction, the second housing wall being bonded to the battery cell assembly.

[0043] Since the second housing wall is bonded to the battery cell assembly, multiple battery cell assemblies are formed into a whole through the second housing wall, which increases the stiffness of the battery device along the third direction and reduces the probability of deformation of the battery device along the first direction or mitigates the degree of deformation of the battery device along the first direction.

[0044] The second aspect of this application provides an electrical device, which includes the battery device provided in the first aspect of this application.

[0045] Since the electrical device includes the battery device provided above, the battery device can both suppress the deformation of the casing and reduce manufacturing costs, thereby improving the reliability of the electrical device and reducing the production and maintenance costs of the electrical device.

[0046] A third aspect of this application provides an energy storage device, which includes the battery device provided in the first aspect of this application.

[0047] Since the energy storage device includes the battery device provided above, the battery device can both suppress the deformation of the casing and reduce manufacturing costs, thus improving the reliability of the energy storage device and reducing the production and maintenance costs of the energy storage device. Attached Figure Description

[0048] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0049] Figure 2 This is a three-dimensional structural schematic diagram of a battery device provided in some embodiments of this application;

[0050] Figure 3 This is an exploded perspective view of a battery device provided in some embodiments of this application;

[0051] Figure 4 An exploded perspective view of a battery cell provided in some embodiments of this application;

[0052] Figure 5 This is a top view of the cover provided in some embodiments of this application;

[0053] Figure 6 Provided for some embodiments of this application Figure 5 A schematic diagram of the AA cross-section;

[0054] Figure 7 Provided for some embodiments of this application Figure 6 A magnified view of region A1;

[0055] Figure 8 A top view of the cover provided for other embodiments of this application;

[0056] Figure 9 Provided for some embodiments of this application Figure 8 BB cross-sectional diagram;

[0057] Figure 10 Provided for some embodiments of this application Figure 9 A magnified view of region B1;

[0058] Figure 11 A top view of the cover provided for some embodiments of this application;

[0059] Figure 12 Provided for some embodiments of this application Figure 11 A schematic diagram of the CC cross-section;

[0060] Figure 13 Provided for some embodiments of this application Figure 12 A magnified schematic diagram of region C1;

[0061] Figure 14 This is a top view of the cover provided in some embodiments of this application;

[0062] Figure 15 Provided for some embodiments of this application Figure 14 DD cross-sectional schematic diagram;

[0063] Figure 16 Provided for some embodiments of this application Figure 15 A magnified view of region D1;

[0064] Figure 17 A three-dimensional structural diagram of the cover and rigid member provided in some embodiments of this application;

[0065] Figure 18 Provided for some embodiments of this application Figure 17 A magnified schematic diagram of the E1 region;

[0066] Figure 19 A three-dimensional structural schematic diagram of the cover and rigid member provided for some embodiments of this application;

[0067] Figure 20 Provided for some embodiments of this application Figure 19 A magnified view of the F1 region;

[0068] Figure 21 A three-dimensional structural diagram of the cover and rigid member provided in some embodiments of this application;

[0069] Figure 22 Provided for some embodiments of this application Figure 21 A magnified schematic diagram of the G1 region;

[0070] Figure 23 This is a schematic diagram of the structure of a battery device provided in some other embodiments of this application;

[0071] Figure 24 Provided for some embodiments of this application Figure 23 A schematic diagram of the HH cross-section;

[0072] Figure 25 Provided for some embodiments of this application Figure 23 Schematic diagram of section II;

[0073] Figure 26 This is a perspective structural diagram of a battery device provided in some other embodiments of this application;

[0074] Figure 27This is a three-dimensional structural diagram of a battery device provided in some other embodiments of this application after the cover has been removed.

[0075] Explanation of reference numerals in the attached figures

[0076] 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 1, Housing; 11, Receiving Cavity; 12, Opening; 13, First Housing Wall; 131, Reinforcing Rib; 132, First Mounting Boss; 133, Pressure Relief Outlet; 14, Second Housing Wall; 2, Battery Cell Assembly; 21, Battery Cell; 210, Outer Shell; 211, Large Surface Outer Shell Wall; 3, Cover; 31, First Cover Section; 32 1. Second cover portion; 34. Connection clearance hole; 35. Thin-walled portion; 36. First partial thickening portion; 4. Rigid member; 41. Rigid member main body portion; 42. Rigid member connecting portion; 51. First connecting member; 52. Second connecting member; 53. Third connecting member; 6. Gap; 7. Electrode assembly; 7a. Positive electrode tab; 7b. Negative electrode tab; 8. Electrode terminal; 9. Pressure relief valve; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0077] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0078] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0079] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0080] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. Unless otherwise specified, all embodiments and optional embodiments of this application may be combined with each other to form new technical solutions. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described herein can be combined with other embodiments. Unless otherwise specified, all technical features and optional technical features of this application may be combined with each other to form new technical solutions.

[0081] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0082] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0083] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0084] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0085] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "projection" refers to an orthographic projection in which parallel projection lines are perpendicular to the projection plane.

[0086] The following is a detailed description of this application.

[0087] In existing battery systems, battery devices typically include a battery box and individual battery cells located within the box. To suppress deformation of the battery box, a solution exists to install rigid components on the outside of the box. However, the surface of these rigid components usually requires anti-corrosion treatment or the use of corrosion-resistant metals such as stainless steel, resulting in high production costs. Therefore, balancing the suppression of battery box deformation with the reduction of production costs is one of the research directions in the industry.

[0088] Research has shown that if most of the rigid component is placed inside the cover (the rigid component is embedded in the cover), forming a structure in which the cover encloses most of the rigid component while only the part used for connection is exposed, then on the one hand, the strength and rigidity of the cover can be enhanced by the rigid component, improving the cover's resistance to deformation; on the other hand, the exposed part of the rigid component can be reduced, lowering the probability or degree of corrosion of the rigid component. Thus, even without implementing additional anti-corrosion measures for the rigid component, it is possible to both suppress the deformation of the battery box and reduce the production cost of the battery box.

[0089] Based on this design concept, this application provides a battery device, which includes: a housing defining a receiving cavity, the housing having an opening facing a first direction; a cover connected to the housing and closing the opening along the first direction; at least one battery cell assembly housed in the receiving cavity; and at least one rigid member, each rigid member including a rigid member body and a rigid member connecting portion, the rigid member connecting portion being connected to both ends of the rigid member body, the rigid member body being embedded in the cover, and the rigid member connecting portion being at least partially exposed from the cover and respectively connected to the housing.

[0090] Because the rigid component is embedded within the cover, it enhances the strength and rigidity of the cover, suppressing deformations such as bulging or concavity along the first direction, and also inhibiting deformation of the battery casing. For example, when some battery cells in a battery assembly experience thermal runaway and release gas, leading to an increase in gas within the battery casing, the rigid component can suppress the probability of the cover bulging or even breaking due to this gas. It can also reduce the probability or degree of casing deformation caused by cover deformation, improving the dimensional accuracy of the battery device's outer contour and enhancing its appearance. Furthermore, during the gas filling test phase of battery assembly, the step of pressing the cover to prevent bulging and deformation, along with the corresponding tooling, can be eliminated, reducing production costs and increasing efficiency. Additionally, because the cover encloses the rigid component's main body, reducing the contact area between the main body and the outside environment, the probability of corrosion is reduced even without anti-corrosion measures. Moreover, its simple manufacturing process further reduces production costs.

[0091] The battery device provided in this application embodiment can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft.

[0092] This application also provides an energy storage device including the above-described battery device. The energy storage device may include an energy storage container, an energy storage cabinet, etc.

[0093] This application also provides an electrical device including the above-described battery device. The electrical device can be, but is not limited to, a mobile phone, tablet, laptop, electric toy, power tool, electric vehicle, electric car, ship, spacecraft, aircraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0094] In the following embodiments, for ease of explanation, an example of an electrical device of this application, namely a vehicle 1000, will be used for illustration.

[0095] Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. Figure 1 As shown, a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0096] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0097] Figure 2 This is a three-dimensional structural schematic diagram of a battery device provided in some embodiments of this application; Figure 3 This is an exploded perspective view of a battery device provided in some embodiments of this application; Figure 4 This is an exploded perspective view of a battery cell provided in some embodiments of this application.

[0098] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies 2 for providing voltage and capacity. The battery cell assembly 2 may include multiple battery cells 21, which are connected in series, parallel, or mixed connection via a busbar.

[0099] In some embodiments, a battery cell assembly 2 is typically formed by arranging multiple battery cells 21; as an example, one or more battery cell assemblies 2 can constitute a battery module, which is formed by arranging and fixing multiple battery cell assemblies 2 into a single module. As an example, a battery module can be formed by bundling multiple battery cell assemblies 2 together with cable ties.

[0100] In some embodiments, the battery device may be a battery pack, which includes a battery case and one or more battery cell assemblies 2, the battery cell assemblies 2 being housed in the battery case.

[0101] As an example, one or more battery cell components 2 can constitute a battery module, and the battery cell components 2 can be housed in a battery box by fixing the battery module in a battery box.

[0102] As an example, the battery cell assembly 2 can also be housed in the battery box by directly fixing multiple battery cells 21 to the battery box.

[0103] As an example, such as Figure 3 As shown, the battery box may include a cover 3 and a box body 1. The cover 3 and the box body 1 are fastened together to form a closed space inside the battery box to house the battery cell assembly 2. Here, "closed" refers to covering or closing, which can be sealed or not sealed. The cover 3 may be a top cover, a side cover, or a bottom cover.

[0104] In this embodiment of the application, the battery cell 21 can be a secondary battery. A secondary battery refers to a battery cell 21 that can be used again after being discharged by recharging to activate the active materials.

[0105] The battery cell 21 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0106] like Figure 4As shown, a battery cell 21 generally includes an electrode assembly 7. The electrode assembly 7 includes a positive electrode, a negative electrode, and a separator. During the charging and / or discharging process of the battery cell 21, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is disposed between the positive and negative electrodes to prevent short circuits between the positive and negative electrodes, while allowing active ions to pass through.

[0107] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0108] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0109] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0110] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0111] In some embodiments, the electrode assembly 7 further includes an isolator disposed between the positive and negative electrodes.

[0112] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0113] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0114] In some embodiments, the battery cell 21 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application embodiment does not impose specific limitations on the type of electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0115] In some embodiments, the electrode assembly 7 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0116] In some embodiments, the electrode assembly 7 is a stacked structure.

[0117] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0118] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0119] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0120] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0121] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0122] In some embodiments, the electrode assembly 7 may be cylindrical, flat, or polygonal, etc.

[0123] In some embodiments, such as Figure 4 As shown, the electrode assembly 7 is provided with tabs that allow current to be drawn out from the electrode assembly 7. The tabs include a positive tab 7a and a negative tab 7b.

[0124] In some embodiments, the battery cell 21 may include a housing 210. The housing is used to encapsulate components such as the electrode assembly 7 and the electrolyte. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0125] As an example, the battery cell 21 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells. There are no particular limitations in the embodiments of this application.

[0126] In some embodiments, a pressure relief valve 9 is provided on the housing. The pressure relief valve 9 is used to release the internal pressure of the battery cell 21.

[0127] Below, refer to Figures 2 to 27 Some embodiments of this application will be described in detail.

[0128] In the description of the embodiments of this application, for ease of explanation, the direction of arrow X represents "first direction X", the direction of arrow Y represents "second direction Y", and the direction of arrow Z represents "third direction Z". The first direction X, the second direction Y, and the third direction Z intersect each other pairwise, and the three directions are not coplanar. In some embodiments, the first direction X, the second direction Y, and the third direction Z intersect each other perpendicularly.

[0129] The first aspect of this application provides a battery device, such as... Figure 2 , Figure 3 As shown, the battery device includes: a housing 1 defining a receiving cavity 11, the housing 1 having an opening 12 that opens toward a first direction X; a cover 3 connected to the housing 1 and closing the opening 12 along the first direction X; at least one battery cell assembly 2, housed in the receiving cavity 11; and at least one rigid member 4, each rigid member 4 including a rigid member body portion 41 and a rigid member connecting portion 42, the rigid member connecting portion 42 being connected to both ends of the rigid member body portion 41, the rigid member body portion 41 being embedded in the cover 3, and the rigid member connecting portion 42 being at least partially exposed from the cover 3 and respectively connected to the housing 1.

[0130] In some embodiments, such as Figure 2 and Figure 3 As shown, the housing 1 and the cover 3 are aligned along the first direction X, with the cover 3 closing the opening 12 of the housing 1. The receiving cavity 11 can accommodate the battery cell assembly 2.

[0131] Optionally, the battery cell assembly 2 can be one, two, three or more, etc.

[0132] In some embodiments, the battery cell assembly 2 includes one or more battery cells 21. When the battery cell assembly 2 includes multiple battery cells 21, the multiple battery cells 21 in the same battery cell assembly 2 may be arranged along a second direction Y or a third direction Z.

[0133] Optionally, if there are multiple battery cell modules 2, the multiple battery cell modules 2 can be arranged along a first direction X, a second direction Y, or a third direction Z.

[0134] In a specific embodiment, such as Figure 3 As shown, multiple battery cell modules 2 are arranged along the third direction Z, and multiple battery cells 21 in the same battery cell module 2 are arranged along the second direction Y.

[0135] In some embodiments, such as Figures 5 to 22 As shown, the rigid component 4 includes a rigid component main body 41 and a rigid component connecting part 42 connected to the rigid component main body 41. Both ends of the rigid component main body 41 along the second direction Y are provided with rigid component connecting parts 42. The rigid component main body 41 is located inside the cover 3 (embedded in the cover 3), and the rigid component connecting part 42 is connected to the box 1.

[0136] Optionally, the rigid component main body 41 and the rigid component connecting part 42 can be an integral part or a separate structure.

[0137] In some embodiments, the rigid member 4 is made of high-strength spring steel or carbon steel.

[0138] In some embodiments, a portion or all of the rigid member 4 (e.g., the rigid member body 41) may be made of fiber-reinforced composite resin material.

[0139] Optionally, the materials of the rigid member body 41 and the rigid member connecting part 42 can be the same or different. For example, the rigid member body 41 is made of fiber-reinforced composite resin material, and the rigid member connecting part 42 is made of steel material.

[0140] In some embodiments, the cover 3 is made of a non-metallic material. Exemplarily, the cover 3 is made of at least one of polycarbonate, polypropylene, polyphenylene sulfide, polyimide, polyethylene terephthalate, polyethylene, epoxy resin, polyurethane resin, fiber-reinforced thermosetting composite material, epoxy resin, and polyurethane resin.

[0141] In some embodiments, part of the cover 3 is made of metal, and an insulating layer is provided on the outer surface of the cover 3, which can make the outer surface of the cover 3 insulated.

[0142] In some specific embodiments, the cover 3 is made of non-metallic material, and the rigid component 4 is made of steel.

[0143] Alternatively, the rigid component 4 and the cover 3 may be integrally injection molded, for example, by insert molding.

[0144] Alternatively, the cover 3 can be integrally formed with the cover by being sandwiched in a multilayer resin material.

[0145] Optionally, the number of rigid members 4 can be one or more.

[0146] In some embodiments, such as Figure 2 , Figure 3 , Figures 5 to 22 As shown, there can be multiple rigid members 4. These multiple rigid members 4 can be arranged generally parallel or non-parallel along the third direction Z.

[0147] In some embodiments, such as Figure 3 As shown, the arrangement direction of the multiple rigid members 4 can be substantially the same as the arrangement direction of the multiple battery cell assembly 2. Optionally, the arrangement direction of the multiple rigid members 4 can also intersect with the arrangement direction of the multiple battery cell assembly 2.

[0148] In some embodiments, such as Figure 3 As shown, the extending direction of the rigid member 4 can be substantially the same as the arrangement direction of the battery cells 21 in the same battery cell assembly 2. Optionally, the extending direction of the rigid member 4 can intersect the arrangement direction of the battery cells 21 in the same battery cell assembly 2.

[0149] In a specific embodiment, such as Figure 3 As shown, multiple battery cell assemblies 2 are arranged along the third direction Z; the battery cells 21 within the same battery cell assembly 2 are arranged with their large surface shell walls 211 facing each other, for example, the battery cells 21 within the same battery cell assembly 2 are arranged along the second direction Y, and the large surface shell walls 211 of each battery cell 21 in the same battery cell assembly 2 are substantially perpendicular to the second direction Y. The large surface shell wall 211 of the battery cell 21 refers to the shell wall with the largest outer surface area among the shell walls of the battery cell 21. Multiple rigid members 4 are arranged along the third direction Z, and each rigid member 4 extends along the second direction Y.

[0150] In some embodiments, the number of battery cell assemblies 2 and the number of rigid members 4 may be the same or different.

[0151] In some embodiments, such as Figure 3 As shown, multiple battery cell assemblies 2 are arranged along the third direction Z, and multiple rigid members 4 are arranged along the third direction Z. In the same projection plane projected along the first direction X, the projection of each battery cell assembly 2 at least partially overlaps with the projection of at least one rigid member body part 41.

[0152] For example, multiple battery cell assemblies 2 are arranged along a third direction Z, and multiple rigid members 4 are arranged along a third direction Z. Within the same projection plane projected along the first direction X, the projections of the shoulders of two adjacent battery cell assemblies 2 along the third direction Z at least partially overlap with the projection of the main body 41 of the same rigid member. For example, as... Figure 3 As shown, within the same projection plane along the first direction X, the projections of the right end of the first battery cell assembly 2 from the left and the left end of the second battery cell assembly 2 from the left are both aligned with the same rigid body portion 41 (e.g., Figure 3 The projection of the first rigid body part 41 from the left shown has an overlapping portion.

[0153] For example, multiple battery cell assemblies 2 are arranged along a third direction Z, and multiple rigid members 4 are arranged along a third direction Z. In the same projection plane projected along the first direction X, the projections of some battery cell assemblies 2 at least partially overlap with the projections of the main body portion 41 of the rigid member. For example, the projection of a rigid member main body portion 41 is substantially located at the middle position of the projection of a battery cell assembly 2.

[0154] The following describes the case where the rigid component 4 is embedded in the cover 3.

[0155] The term "rigid member 4 embedded in cover 3" means that at least a portion of the rigid member 4 is embedded in the gap within the cover 3. Furthermore, when the cover 3 and the rigid member 4 are projected along the first direction X, the second direction Y, and the third direction Z, respectively, the projections of the cover 3 and the rigid member 4 may overlap in at least two of the projections. Even further, the gap within the cover 3 may have at least a continuous circumferential wall, and at least a portion of the rigid member 4 may be surrounded by this continuous circumferential wall.

[0156] In some embodiments, such as Figures 5 to 16 As shown, along the first direction X, the surface of the cover 3 facing away from the battery cell assembly 2 (e.g.) Figure 3 The upper surface shown is different from the surface of the rigid body 41 that is away from the battery cell assembly 2 (e.g., the upper surface shown). Figure 3 The upper surface shown is further away from the battery cell assembly 2; the surface of the cover 3 facing the battery cell assembly 2 (e.g.) Figure 3 The lower surface shown is greater than the surface of the rigid body 41 facing the battery cell assembly 2 (e.g., the surface shown below). Figure 3 The lower surface shown is closer to the battery cell assembly 2. That is, when projected along the first direction X, the projection of the cover 3 covers the projection of the rigid body 41, and when projected along the third direction Z, the projection of the cover 3 covers the projection of the rigid body 41. In other words, along the thickness direction of the cover 3, the surfaces on both sides of the rigid body 41 are covered by a portion of the cover 3.

[0157] To achieve the connection between the rigid member 4 and the housing 1, the rigid member connecting portion 42 can be exposed from the cover 3. The rigid member connecting portion 42 being exposed from the cover 3 includes any of the following situations: the rigid member connecting portion 42 is not embedded in the cover 3 (the rigid member connecting portion 42 is entirely outside the cover 3), or the rigid member connecting portion 42 is embedded in the cover 3 but a part of the rigid member connecting portion 42 is exposed to the external environment through openings in the cover 3, etc. (a part of the rigid member connecting portion 42 is exposed from the cover 3).

[0158] Regarding the connection method between the rigid component connection part 42 and the housing 1, in some embodiments, such as Figure 3 , Figures 17 to 22 As shown, the rigid member connection 42 can be connected to the housing 1 by a connector such as a bolt. For example, at least a portion of the connector can pass through the rigid member connection 42 and the housing 1, thereby connecting the rigid member connection 42 and the housing 1 together, and thus connecting the cover 3 and the housing 1 together.

[0159] In some specific embodiments, such as Figure 3 As shown, the housing 1 has a first housing wall 13 arranged opposite to each other along the second direction Y, and each rigid member connection part 42 is connected to the first housing wall 13. Figure 3 , Figure 17 and Figure 18 As shown, the rigid member connection 42 is opposite to the surface of the first housing wall 13 along the second direction Y that is away from the battery cell assembly 2 (e.g., Figure 3 (The front surface shown) is in contact with the connection. Or Figure 3 , Figures 19 to 22 As shown, the rigid member connection 42 and the surface of the first housing wall 13 facing the rigid member connection 42 along the first direction X (e.g.) Figure 3 The upper surface shown is in contact with the connection.

[0160] In some embodiments, at least the portion of the housing 1 connected to the rigid member connection is made of metal.

[0161] Since the main body 41 of the rigid component is located inside the cover 3, the rigid component 4 can enhance the strength and rigidity of the cover, suppress deformation such as bulging or concavity of the cover 3 along the first direction X, and also suppress deformation of the housing. For example, if some battery cells in the battery cell assembly 2 experience thermal runaway and release gas, leading to an increase in gas inside the battery housing, the rigid component 4 can suppress the probability of these gases causing the cover to bulge or even break, and can also reduce the probability or degree of deformation of the cover 3, improve the dimensional accuracy of the outer contour of the battery device, and improve the appearance of the battery device. Furthermore, during the gas filling test stage in the battery assembly production process, the step of pressing the cover to prevent bulging and deformation of the cover 3 and the corresponding tooling can be eliminated, reducing production costs and improving production efficiency. In addition, since the cover 3 encloses the main body of the rigid component, reducing the contact area between the main body of the rigid component and the outside world, even without anti-corrosion measures, the probability of corrosion of the rigid component can be reduced, and the manufacturing process is simple, achieving a reduction in production costs.

[0162] In some embodiments, such as Figures 5 to 16 As shown, the cover 3 includes a first cover portion 31 and a second cover portion 32 connected along the first direction X, and a cavity is formed between the first cover portion 31 and the second cover portion 32; the rigid body portion 41 is located in the cavity and the first cover portion 31 and the second cover portion 32 cover the circumferential surface of the rigid body portion.

[0163] In some embodiments, the rigid body 41 is covered with a cover 3 on both sides along the first direction X, and the rigid body 41 is covered with a cover 3 on both sides along the third direction Z, that is, the rigid body 41 is covered with a cover 3 in the circumferential direction perpendicular to the second direction Y.

[0164] This application does not specifically limit the size or shape of the cavity, as long as it can accommodate the rigid body portion 41. In a specific embodiment, the dimensions of the cavity outline are similar to the dimensions of the outer outline of the rigid body portion 41, and the rigid body portion 41 can fill the cavity, that is, the rigid body portion 41 is in contact with both the first cover portion 31 and the second cover portion 32.

[0165] like Figure 7 , Figure 10 , Figure 13 and Figure 16 As shown, along the first direction X, the cover 3 located on the side of the dashed line L1 away from the battery cell assembly 2 is the first cover portion 31, and along the first direction X, the cover 3 located on the side of the dashed line L1 close to the battery cell assembly 2 is the second cover portion 32. The dashed line L1 is a virtual line set to illustrate the positional relationship between the rigid member 4 and the surrounding cover portions, and does not mean that the cover 3 is divided at the position of the dashed line L1. In addition, as long as the first cover portion 31 and the second cover portion 32 connected along the first direction X form a cavity with a continuous peripheral wall, the position of the distinction between the two cover portions (i.e., the position of the dashed line L1) is not limited to the position shown in the figure.

[0166] In some embodiments, the first cover portion 31 and the second cover portion 32 are integrally formed. Further, the entire cover 3 can be an integrally formed part. Of course, the first cover portion 31 and the second cover portion 32 can also be separate structures.

[0167] Since the rigid body 41 is located in the cavity and the first cover portion 31 and the second cover portion 32 cover the periphery of the rigid body, the contact area between the rigid body 4 and the external environment can be greatly reduced, the probability of the rigid body being corroded is reduced, and thus the degree of corrosion of the rigid body is reduced.

[0168] Since a cavity is formed between the first cover portion 31 and the second cover portion 32, the thickness at least increases at the location where the first cover portion 31 and the second cover portion 32 are located compared to the case without a cavity.

[0169] Alternatively, in some embodiments, such as Figures 14 to 16 As shown, the cover 3 is formed with a uniform thickness, and the thickness direction is consistent with the first direction X. In other words, the cover 3 does not form a significant local thickening at the location of the first cover portion 31 and the second cover portion 32 (or at the location of the rigid body portion 41), but has a thickness that is substantially the same as that of its surrounding area and even the entire cover 3, which exceeds the dimension of the rigid body portion 41 along the first direction X. In this case, the thickness of the entire cover 3 can be considered to have increased.

[0170] Thus, the cover 3 can be formed into a shape in which both sides opposite each other along the first direction are flat or substantially flat.

[0171] Alternatively, in some embodiments, such as Figures 5 to 13 As shown, the cover 3 is formed having a thin-walled portion 35 and a plurality of locally thickened portions. In at least one locally thickened portion, the first cover portion 31, the rigid body portion 41, and the second cover portion 32 are stacked along the thickness direction, which is consistent with the first direction X.

[0172] In some embodiments, the cover 3 is partially thickened to form a localized thickened portion. In some embodiments, such as Figure 6 , Figure 7 , Figure 9 , Figure 10 , Figure 12 , Figure 13 As shown, the locally thickened portion can be located on one or both sides of the thin-walled portion 35 along the first direction X.

[0173] Specifically, such as Figure 6 , Figure 7 As shown, the second cover portion 32 is connected to the thin-walled portion 35 to form a cover plate portion covering the opening of the box body 1, and the first cover portion 31 is a partially protruding portion relative to the cover plate portion; or, as Figure 9 , Figure 10 , Figure 12 , Figure 13 As shown, the first cover portion 31 is connected to the thin-walled portion 35 to form a cover plate portion that covers the opening of the box body 1, and the second cover portion 32 is a partially protruding portion relative to the cover plate portion. That is, the cover 3 forms a partially thickened portion at the location where the first cover portion 31 and the second cover portion 32 are located (or, at the location where the rigid member main body portion 41 is located).

[0174] Optionally, the thicknesses of the first cover portion 31 and the second cover portion 32 can be the same or different. Optionally, it can be as follows: Figure 7 , Figure 10 As shown, the first cover portion 31 is thinner than the thin-walled portion 35, or vice versa; or, it can be as follows: Figure 13 As shown, the first cover portion 31 and the thin-walled portion 35 have substantially the same thickness. Optionally, the number of locally thickened portions can be one, two, three, or more. Optionally, the locally thickened portions can be provided in a one-to-one correspondence with the rigid members 4, or the number of locally thickened portions can be more or less than the number of rigid members 4. In a specific embodiment, the number of locally thickened portions is greater than the number of rigid members 4, with some locally thickened portions containing rigid members 4 and others not containing rigid members 4.

[0175] In some embodiments, the local thickening portion may be located on the side of the thin-walled portion 35 facing the battery cell assembly along the first direction X, at least a portion of the rigid member body portion 41 is embedded in the thin-walled portion 35, and the side wall of the housing (e.g., the first housing wall) has a clearance groove, thereby exposing the rigid member connection portion 42 to the outside.

[0176] Optionally, the multiple local thickened portions may be arranged along the second direction Y, and / or the multiple local thickened portions may be arranged along the third direction Z.

[0177] Therefore, the thickness of the rigid component 4 can be increased at the location where it is arranged, which helps to suppress the overall thickness of the cover 3, thereby reducing the weight and material cost of the cover and even the battery device.

[0178] It is understood that at least a portion of the first cover portion 31, the rigid member main body portion 41, and the second cover portion 32 may be stacked along the thickness direction in at least one locally thickened portion. Alternatively, the rigid member main body portion 41 may not be provided in at least one locally thickened portion.

[0179] In some embodiments, the cover 3 is configured as an insulating cover 3.

[0180] Optionally, the outer surface of the cover 3 is insulated or the entire cover 3 is made of an insulating material.

[0181] Therefore, the insulation problem of rigid component 4 can be solved without separately insulating it, reducing assembly steps and lowering the production cost of the battery device.

[0182] In some embodiments, the cover 3 is made of resin material. Alternatively, the cover 3 is made of metal material with an insulating layer.

[0183] For example, the cover 3 is made of fiber-reinforced resin composite material.

[0184] The cover 3 is made of resin material, which not only improves the lightweight of the cover 3 and thus the lightweight of the battery device, but also makes the cover 3 insulating. Therefore, the insulation problem of the rigid component 4 and the cover 3 can be solved without separately insulating the rigid component 4 and the cover 3. Since the cover 3 is made of a metal material with an insulating layer, it has high strength and high rigidity. Furthermore, because the metal material has an insulating layer, the outer surface of the cover 3 is insulated.

[0185] In some embodiments, such as Figure 2 , Figure 3 , Figures 17 to 22As shown, at least one battery cell assembly 2 includes a plurality of battery cells 21 arranged along the second direction Y; the housing 1 includes a first housing wall 13 disposed opposite to each other along the second direction Y, and rigid member connecting parts 42 are respectively connected to the first housing wall 13, and the second direction Y intersects the first direction X.

[0186] Optionally, the battery cell assembly 2 may include two, three, four or more battery cells 21 arranged along the second direction Y.

[0187] In some embodiments, the battery cell 21 includes a housing, which defines an accommodating space by connected housing walls. The housing wall can be a large housing wall 211 perpendicular to the second direction Y, or a small housing wall perpendicular to the second direction Y. The large housing wall 211 is the housing wall with the largest outer surface area, and the small housing wall is the housing wall without terminals and with the smallest outer surface area that is not opposite to the housing wall with terminals.

[0188] In some implementations, one side of the first housing wall 13 has a reinforcing rib 131 along the second direction Y, thereby strengthening the first housing wall 13.

[0189] In some embodiments, along the second direction Y, the side of the first housing wall 13 facing away from the battery cell assembly 2 has reinforcing ribs 131, thereby not only strengthening the first housing wall 13 but also not occupying space within the housing 1. Furthermore, the side of the first housing wall 13 facing the battery cell assembly 2 can be generally formed as a flat surface. In some embodiments, this flat surface of the first housing wall 13 abuts against the outer surface of the battery cell assembly 2.

[0190] In some embodiments, there are multiple reinforcing ribs 131, which are arranged in a cross pattern, thereby further strengthening the strength of the first housing wall 13.

[0191] In some embodiments, the first housing wall 13 is made of metal. Optionally, at least the portion of the first housing wall 13 that contacts the battery cell assembly 2 is insulated.

[0192] The specific connection structure between the rigid component connection part 42 and the first box wall 13 will be described in detail below.

[0193] Since the rigid member connecting part 42 is connected to the first box wall 13 respectively, under the pull of the rigid member 4, the first box wall 13 can clamp the battery cell assembly 2 along the second direction Y, so that the battery cell assembly 2 is kept in a regular arrangement, thereby suppressing the deformation of the box due to the expansion and outward extension of the battery cell assembly 2.

[0194] In some embodiments, such as Figure 3 As shown, the battery cell 21 includes a housing, which defines an accommodating space through connected housing walls. The large housing wall 211 in the housing wall is perpendicular to the second direction Y, and the large housing wall 211 is the housing wall with the largest area among the housing walls.

[0195] like Figure 4 As shown, the battery cell 21 includes a housing 210 and an electrode assembly 7 located inside the housing.

[0196] In some embodiments, the electrode assembly 7 is a stacked structure, and the positive electrode, negative electrode and the insulating element in the electrode assembly 7 are arranged along the second direction Y.

[0197] In some embodiments, the electrode assembly 7 is a wound structure, and the electrode assembly 7 has a flat region and a corner region, with the positive electrode, negative electrode and the separator located in the flat region arranged along the second direction Y.

[0198] In some embodiments, the expansion degree of the battery cell 21 along the arrangement direction of the positive electrode, negative electrode, and separator is greater than the expansion degree of the battery cell 21 along the direction intersecting the arrangement direction of the positive electrode, negative electrode, and separator. For example, in Figure 4 In the illustrated embodiment, it is generally assumed that the expansion degree of battery cell 21 along the second direction Y is greater than the expansion degree of battery cell 21 along the first direction X, and the expansion degree of battery cell 21 along the second direction Y is greater than the expansion degree of battery cell 21 along the third direction Z.

[0199] The large surface shell wall 211 of the battery cell 21 is prone to expansion and deformation due to the charging and / or discharging of the battery cell 21. Since the large surface shell wall 211 is perpendicular to the second direction Y, it can be subjected to a large clamping force (binding force) along the second direction Y by the rigid member 4 and the first housing wall 13. Therefore, the probability or degree of deformation of the large surface shell wall caused by the expansion of the battery cell 21 due to charging and / or discharging can be reduced, thereby reducing the probability of deformation of the battery device or mitigating the degree of deformation of the battery device.

[0200] Below, further reference Figures 17 to 22 The specific connection structure between the rigid component connection part 42 and the first box wall 13.

[0201] In some embodiments, such as Figure 2 , Figure 17 and Figure 18 As shown, the rigid member connecting part 42 is bent relative to the rigid member main body part 41 along the second direction Y. The rigid member connecting part 42 is located on the side of the first housing wall 13 away from the battery cell assembly 2. The battery device also includes a first connector 51, which connects the rigid member connecting part 42 and the first housing wall 13.

[0202] In some embodiments, the rigid member connection portion 42 is bent relative to the rigid member body portion 41, and the rigid member connection portion 42 extends along a first direction X.

[0203] In some embodiments, the first connector 51 may be a threaded fastener, which passes sequentially through the rigid member connection portion 42 and the first housing wall 13, with its head abutting against the rigid member connection portion 42. Optionally, a washer may be further provided between the head and the rigid member connection portion 42.

[0204] In some embodiments, such as Figure 3 As shown, the first housing wall 13 has a first mounting boss 132, and the first connector 51 connects the rigid member connecting part 42 to the first mounting boss 132.

[0205] In some embodiments, the first mounting boss 132 is formed by thickening a portion of the first housing wall 13, thereby improving the strength and rigidity of the position where the first housing wall 13 is connected to the first connector 51.

[0206] In some embodiments, each first housing wall 13 and each rigid member connection portion 42 can be connected by one or more first connectors 51.

[0207] Optionally, the first connector 51 can be a bolt or screw, etc.

[0208] Thus, the rigid member connection part 42 can be connected to the first box wall 13 respectively.

[0209] In some embodiments, such as Figure 3 , Figure 19 and Figure 20 As shown, along the first direction X, the rigid member connection part 42 is located on the side of the first housing wall 13 near the cover 3. The battery device also includes a second connector 52, which connects the rigid member connection part 42 and the first housing wall 13.

[0210] In some embodiments, the rigid member connection portion 42 extends along the second direction Y.

[0211] In some embodiments, the second connector 52 may be a threaded fastener that passes through the rigid member connection portion 42 and is inserted into and fastened to the first housing wall 13 from the end of the first housing wall 13.

[0212] In some embodiments, the first housing wall 13 has a second mounting boss (not shown), and the second connector 52 connects the rigid member connecting portion 42 to the second mounting boss.

[0213] In some embodiments, the second mounting boss is formed by thickening a portion of the first housing wall 13, thereby increasing the strength and rigidity of the position where the first housing wall 13 is connected to the second connector 52.

[0214] Optionally, the second connector 52 can be a bolt or screw, etc.

[0215] In some embodiments, each first housing wall 13 and each rigid member connection portion 42 can be connected by one or more second connectors 52.

[0216] Thus, the rigid member connection part 42 can be connected to the first box wall 13 respectively.

[0217] In some embodiments, such as Figure 3 , Figure 21 and Figure 22 As shown, the rigid member connecting part 42 is built into the cover body 3. The rigid member connecting part 42 has a connecting hole, and the cover body 3 has a connecting clearance hole 34. The battery device also includes a third connecting part 53. The third connecting part 53 passes through the connecting clearance hole 34 and the connecting hole at least partially, connecting the rigid member connecting part 42 to the first housing wall 13. The third connecting part 53 contacts the side of the rigid member connecting part 42 opposite to the battery cell assembly 2 along the first direction X.

[0218] In some embodiments, such as Figure 21 and Figure 22 As shown, a portion of the third connector 53 (e.g., the head of a bolt) is recessed into the connection clearance hole 34, thereby enabling reliable fastening to the rigid member connection portion 42. In other words, when viewing the connection clearance hole 34 and the rigid member connection portion 42 along the first direction X, the connection hole and a portion of the rigid member connection portion 42 around it can be observed through the connection clearance hole 34.

[0219] In some embodiments, the third connector 53 may be a bolt fastener, the third connector 53 passing through the connection clearance hole 34, the connection hole and the portion of the first housing wall 13, with its head abutting against the rigid member connection portion 42 exposed in the connection clearance hole 34.

[0220] In some embodiments, the first housing wall 13 has a third mounting boss (not shown), and the third connector 53 connects the rigid member connecting portion 42 to the third mounting boss.

[0221] In some embodiments, the third mounting boss is formed by thickening a portion of the first housing wall 13, thereby improving the strength and rigidity of the position where the first housing wall 13 is connected to the third connector 53.

[0222] Optionally, the third connector 53 can be a bolt or screw, etc.

[0223] In some embodiments, each first housing wall 13 and each rigid member connection portion 42 can be connected by one or more third connectors 53.

[0224] This application does not specifically limit the shape and size of the connection clearance hole 34, as long as the connection clearance hole 34 can avoid the third connector 53 and make the third connector 53 contact the rigid member connection part 42 on the side away from the battery cell assembly 2 along the first direction X.

[0225] This application does not impose specific limitations on the shape and size of the connecting hole, as long as the connecting hole can avoid the third connecting part and the third connecting flange can abut against the rigid member connecting part 42.

[0226] In one specific embodiment, both the connecting hole and the connecting clearance hole 34 are circular holes, and the connecting hole and the connecting clearance hole 34 are concentrically arranged, with the diameter of the connecting hole being smaller than the diameter of the connecting clearance hole 34.

[0227] In one specific embodiment, the shape and size of the connecting hole are similar to the shape and size of the outer peripheral surface of the third connecting part perpendicular to the first direction X.

[0228] Therefore, the rigid member connecting portion 42 can be connected to the first housing wall 13 respectively. Moreover, since the rigid member connecting portion 42 is built into the cover 3, as much of the rigid member 4 as possible can be located inside the cover 3, improving the corrosion resistance reliability of the rigid member 4. Since the cover 3 has a connection clearance hole 34, the third connecting member 53 contacts the side of the rigid member connecting portion 42 opposite to the battery cell assembly 2 along the first direction X. Therefore, the risk of insufficient fastening due to cover deformation can be reduced. For example, in the case where the cover is made of resin material, the risk of the third connecting member and the rigid member connecting portion loosening due to cover creep can be reduced.

[0229] Understandably, the third connector 53 can also contact the side of the cover 3 opposite to the battery cell assembly 2 along the first direction X.

[0230] The positional relationship between rigid component 4 and battery cell assembly 2 will be further explained below.

[0231] In some embodiments, such as Figure 2 and Figure 3 As shown, multiple battery cell assemblies 2 are arranged along a third direction Z, and multiple rigid members 4 are arranged along a third direction Z. The first direction X, the second direction Y, and the third direction Z intersect each other. In the projection plane projected along the first direction X, the projection of each battery cell assembly 2 overlaps with the projection of the rigid member body portion 41 of at least one rigid member 4.

[0232] Within the projection plane projected along the first direction X, the projection of each battery cell assembly 2 may overlap with the projection of one, two, three or more rigid body parts 41.

[0233] For example, the projection of each battery cell assembly 2 may overlap with the projection of one rigid body portion 41; or, the projection of each battery cell assembly 2 may overlap with the projections of two rigid body portions 41; or, the projection of a portion of the battery cell assemblies 2 may overlap with the projections of one or two rigid body portions 41.

[0234] This article does not specifically limit the area of ​​the overlapping portion of the projection of each battery cell assembly 2 and the projection of the rigid body 41 within the projection plane along the first direction X. The area of ​​the overlapping portion can be adjusted according to the requirements.

[0235] Therefore, the expansion force of the battery cell assembly 2 can be evenly borne by multiple rigid members 4, which can reliably reduce the probability of the battery cell assembly 2 expanding due to charging and / or discharging or reduce the degree of expansion of the battery cell assembly 2 due to charging and / or discharging, thereby reducing the probability of battery device deformation or reducing the degree of battery device deformation.

[0236] It is understandable that, within the projection plane projected along the first direction X, the projection of a portion of the battery cell assembly 2 and the projection of the rigid body 41 may not overlap.

[0237] In some embodiments, in the projection plane projected along the first direction X, the projection of at least one rigid member body portion 41 overlaps with the projections of two adjacent battery cell assemblies 2 along the third direction Z.

[0238] In some embodiments, within the projection plane projected along the first direction X, the projections of each rigid member main body portion 41 overlap with the projections of two adjacent battery cell assemblies 2 along the third direction Z. Specifically, when the rigid member 4 and the electrode terminals 8 (also called poles) of the battery cell 21 are located on the same side along the first direction X, the projections of the rigid member main body portion 41 and the electrode terminals 8 may not overlap; similarly, when the rigid member 4 and the pressure relief valve 9 of the battery cell 21 are located on the same side along the first direction X, the projections of the rigid member main body portion 41 and the pressure relief valve 9 may not overlap.

[0239] Therefore, at least some of the battery cells 21 are subjected to the binding force of the rigid member 4 at both ends along the third direction Z, so that the battery cell assembly 2 can be clamped evenly and reliably, further reducing the probability of the battery cell assembly 2 expanding due to charging and / or discharging or mitigating the degree of expansion of the battery cell assembly 2 due to charging and / or discharging, thereby further reducing the probability of battery device deformation or mitigating the degree of battery device deformation.

[0240] exist Figure 4In the specific embodiment of the battery cell 21 shown, the portion of the top cover located on both sides of the electrode terminal 8 along the third direction Z is also referred to as the shoulder of the battery cell 21. Furthermore, the shoulders of all battery cells 21 in the battery cell assembly 2 are referred to as the shoulders of the battery cell assembly 2. The projection of a rigid body part 41 can overlap with the shoulders of two adjacent battery cell assemblies 2.

[0241] In some embodiments, such as Figures 23 to 25 As shown, the cover 3 is formed having a thin-walled portion 35 and a plurality of locally thickened portions, including a first locally thickened portion 36 that protrudes relative to the thin-walled portion 35 toward the side closer to the battery cell assembly 2, and the first locally thickened portion 36 contacts the battery cell assembly 2.

[0242] It is understandable that the structure described here can also be applied to Figure 2 , Figure 3 The battery device shown.

[0243] Optionally, the number of the first local thickened portions 36 can be one, two, three or more.

[0244] Optionally, the plurality of first partial thickening portions 36 may be arranged along the second direction Y, and / or the plurality of first partial thickening portions 36 may be arranged along the third direction Z.

[0245] In a specific embodiment, such as Figure 23 , Figure 24 and Figure 25 As shown, the first partial thickening portion 36 extends along the second direction Y, and a plurality of first partial thickening portions 36 are arranged along the third direction Z.

[0246] In some embodiments, the first partial thickening portion 36 extends along the second direction Y, and the length of the first partial thickening portion 36 along the second direction Y may be less than or approximately equal to the length of the opening 12 along the second direction Y.

[0247] In some embodiments, the first partial thickening portion 36 extends along the second direction Y, and the length of the first partial thickening portion 36 along the second direction Y may be greater than, substantially equal to or less than the length of the battery cell assembly 2 along the second direction Y.

[0248] In some embodiments, along the first direction X, the first partial thickening portion 36 is close to the surface of the battery cell assembly 2 (e.g., Figure 24 The lower surface shown is generally planar, which facilitates reliable contact between the first partial thickening portion 36 and the battery cell assembly 2. Of course, the first partial thickening portion 36 is close to the surface of the battery cell assembly 2 (e.g., Figure 24 The lower surface shown can also be a curved surface with a slight curvature.

[0249] In some embodiments, the first partial thickening portion 36 abuts against a portion of the battery cell 21 in the battery cell assembly 2 where no electrode terminal 8 or pressure relief valve (not shown) or other components are provided.

[0250] Optionally, the first partial thickening portion 36 may contact all the battery cells 21 in the same battery cell assembly 2; or the first partial thickening portion 36 may contact some of the battery cells 21 in the same battery cell assembly 2.

[0251] Optionally, the first partial thickening portion 36 may be bonded to the battery cell assembly 2; or the first partial thickening portion 36 may only contact the battery cell assembly 2 without being connected.

[0252] Optionally, the number of the first partial thickening portion 36 may be the same as or different from the number of the rigid member 4.

[0253] Optionally, each of the first partial thickening portions 36 is provided with at least one rigid main body portion 41; some of the first partial thickening portions 36 are provided with at least one rigid main body portion 41.

[0254] The first partial thickening portion 36 can enhance the strength and rigidity of the cover 3 and improve its ability to suppress deformation. In addition, since the first partial thickening portion 36 is in contact with the battery cell assembly 2, it can apply pressure along the first direction X to the battery cell assembly 2, thereby fixing the relative position of the battery cell assembly 2 and reducing the probability of the battery cell assembly 2 shaking or misaligning along the first direction X.

[0255] In some embodiments, such as Figure 24 and Figure 25 As shown, multiple battery cell assemblies 2 are arranged along the third direction Z; the same first local thickened portion 36 is in contact with the shoulders of two adjacent battery cell assemblies 2 arranged along the third direction Z, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0256] The battery cell assembly 2 has a first surface near the first local thickened portion 36 along the first direction X. The portion of the first surface near the edge along the third direction Z is the shoulder of the battery cell assembly 2. The shoulder of the battery cell assembly 2 has no obvious size limitation and is determined according to the actual situation.

[0257] In some embodiments, the plurality of battery cell assemblies 2 include a first battery cell assembly and a second battery cell assembly arranged adjacent to each other along the third direction Z. The same first partial thickening portion 36 abuts against the end of the first battery cell assembly near the second battery cell assembly along the third direction Z, and the end of the second battery cell assembly near the first battery cell assembly along the third direction Z.

[0258] Thus, a first partial thickening portion 36 can position the two battery cell assemblies 2 along the first direction X, simplifying the structure of the cover 3 and thereby simplifying the structure of the battery device.

[0259] In some embodiments, such as Figures 11 to 13 As shown, in at least one first local thickened portion 36, the first cover portion 31, the rigid member main body portion 41, and the second cover portion 32 are stacked along the thickness direction, which is consistent with the first direction X.

[0260] In some embodiments, in each of the first partial thickening portions 36, the first cover portion 31, the rigid member main body portion 41, and the second cover portion 32 are stacked along the thickness direction. That is, the rigid member main body portion 41 is located within the first partial thickening portion 36.

[0261] Since the first cover portion, the rigid body portion, and the second cover portion are stacked along the thickness direction in at least one first partial thickening portion, the strength and rigidity of the first partial thickening portion of the cover can be enhanced, the strength and rigidity of the cover can be further strengthened through the first partial thickening portion, and the ability of the cover to resist deformation can be improved; moreover, the first partial thickening portion can be reliably pressed onto the battery cell.

[0262] In some embodiments, the first partial thickening portion 36 is bonded to the battery cell assembly 2. This bonding can be achieved using an adhesive.

[0263] Optionally, the first partial thickening portion 36 can be bonded to all battery cells 21 in the battery cell assembly 2, or the first partial thickening portion 36 can be bonded to some of the battery cells 21 in the battery cell assembly 2. In a specific embodiment, the first partial thickening portion 36 is bonded to all battery cells 21 in the battery cell assembly 2.

[0264] Since the first partial thickening portion 36 is bonded to the battery cell assembly 2, multiple battery cell assemblies 2 and the cover 3 form a single unit, increasing the stiffness of the battery device along the third direction Z and reducing the probability or degree of deformation of the battery device along the first direction X. Furthermore, for example, when the cover 3 is the top cover of the battery device, the bonding of the first partial thickening portion 36 to the battery cell assembly 2 allows it to apply a tensile force along the first direction to the battery cell assembly 2, reducing the pressure of the battery cell assembly 2 on the lower support member of the casing. This improves the overall structural strength and stiffness of the casing, facilitating designs that reduce casing strength, such as thinning the casing or reducing reinforcing beams, to achieve cost and weight reduction. Moreover, because the first partial thickening portion is bonded to the battery cell assembly, the relative positions of the battery cell assemblies in the third direction Z are fixed.

[0265] In some embodiments, such as Figure 4 , Figure 24 and Figure 25 As shown, multiple battery cell assemblies 2 are arranged along the third direction Z. Each battery cell assembly 2 includes at least one battery cell 21. Each battery cell 21 has a pressure relief valve 9 disposed toward the cover 3 (only the pressure relief valve of one battery cell is shown, and the illustrations of other pressure relief valves are omitted). Multiple first partial thickening portions 36 are arranged along the third direction Z. Along the first direction X, there is a gap 6 between the pressure relief valve 9 and the thin-walled portion 35. Furthermore, in the same projection plane projected along the first direction X, the projection of the pressure relief valve 9 is located between the projections of adjacent first partial thickening portions 36.

[0266] In some embodiments, a plurality of first partial thickening portions 36 are arranged along a third direction Z and the first partial thickening portions 36 extend along a second direction Y. Two first partial thickening portions 36 contact the two shoulders of the same battery cell assembly 2 along the second direction Y respectively. The two first partial thickening portions 36, the thin-walled portion 35, and the battery cell assembly 2 that is in contact with both first partial thickening portions 36 surround to form a pressure relief channel. For example, the gas released by the pressure relief valve 9 when the battery cell 21 undergoes thermal runaway can flow directionally through the pressure relief channel.

[0267] In some embodiments, such as Figure 24 , Figure 26 and Figure 27 As shown, the housing 1 is provided with a pressure relief outlet 133, which is connected to the pressure relief channel. The gas released when the pressure relief valve is opened can flow into the pressure relief outlet 133 through the pressure relief channel and then flow out of the housing 1.

[0268] In some embodiments, the pressure relief outlet 133 is disposed on the first housing wall 13. Optionally, the pressure relief outlet 133 may include a valve mechanism that can automatically open under a certain air pressure.

[0269] In some embodiments, within the same projection plane projected along the second direction Y, the projection of the pressure relief outlet 133 is located between the projections of adjacent first partial thickening portions 36.

[0270] Since there is a gap between the pressure relief valve 9 and the thin-walled portion 35, and the projection of the pressure relief valve 9 is located between the projections of adjacent first partial thickening portions 36 in the same projection plane along the first direction X, the adjacent first partial thickening portions 36, thin-walled portions 35, and battery cell assembly 2 along the third direction Z can define a pressure relief channel. The gas released by the pressure relief valve 9 after being opened can flow directionally along the pressure relief channel, reducing the probability that the gas released by the pressure relief valve after being opened will damage the battery device.

[0271] In some embodiments, such as Figure 4 , Figure 24 and Figure 25As shown, the housing 1 includes a second housing wall 14 that is opposite to the cover 3 along the first direction X, and the second housing wall 14 is bonded to the battery cell assembly.

[0272] Optionally, the second housing wall 14 can be bonded to all the battery cells 21 in the battery cell assembly 2, or the second housing wall 14 can be bonded to some of the battery cells 21 in the battery cell assembly 2.

[0273] In some embodiments, the second housing wall 14 is bonded to the battery cell assembly 2, and the first partial thickening portion 36 is bonded to the battery cell assembly 2.

[0274] In some embodiments, the second housing wall 14 is a heat exchanger, and optionally, the heat exchanger has a heat exchange medium flow channel inside. Optionally, the heat exchange medium collection port (inlet, outlet) of the heat exchange medium flow channel can be located outside the housing 1.

[0275] Since the second housing wall is bonded to the battery cell assembly, multiple battery cell assemblies are formed into a whole through the second housing wall, which increases the stiffness of the battery device along the third direction and reduces the probability of deformation of the battery device along the first direction or mitigates the degree of deformation of the battery device along the first direction.

[0276] In some embodiments, the housing 1 includes a plurality of housing walls that define a receiving cavity 11, and the cover 3 closes the receiving cavity 11. The plurality of housing walls are separately arranged.

[0277] Because the housing wall is designed in sections, the assembly flexibility of the housing wall and the battery cell assembly 2 can be improved. Moreover, a portion of the housing wall can be assembled first, and then the battery cell assembly 2 can be assembled into the incomplete housing 1 before the housing 1 can be fully assembled. This saves the gap left by the smooth assembly of the battery cell assembly 2 into the housing 1, reduces the size of the housing 1, and thus reduces the size of the battery device, which is conducive to the miniaturization of the battery device.

[0278] In some embodiments, at least a portion of the battery cell assembly 2 is in contact with the casing wall, and the receiving cavity 11 is sealed relative to the outside of the casing 1.

[0279] In some embodiments, a plurality of battery cell assemblies 2 constitute a battery module, and at least a portion of the surface of the battery module is in contact with the casing wall.

[0280] In some embodiments, the battery module, housing 1, and cover 3 together form a battery pack.

[0281] Since the battery cell assembly 2 is in contact with the casing wall, the size of the casing 1 can be reduced, thereby reducing the size of the battery device and facilitating the miniaturization of the battery device.

[0282] The second aspect of this application provides an electrical device, which includes the battery device provided in the first aspect of this application.

[0283] Since the electrical device includes the battery device provided above, the battery device can both suppress the deformation of the casing and reduce manufacturing costs, thereby improving the reliability of the electrical device and reducing the production and maintenance costs of the electrical device.

[0284] A third aspect of this application provides an energy storage device, which includes the battery device provided in the first aspect of this application.

[0285] Since the energy storage device includes the battery device provided above, the battery device can both suppress the deformation of the casing and reduce manufacturing costs, thus improving the reliability of the energy storage device and reducing the production and maintenance costs of the energy storage device.

[0286] The following describes some specific embodiments.

[0287] In one specific embodiment, the top cover of the battery box mainly consists of two parts: a non-metallic cover body 3 and a rigid metal component 4. The cover body 3 is generally made of composite material or plastic, while the rigid component 4 is generally made of high-strength spring steel or carbon steel. During the production process of the top cover, the rigid component 4 is embedded into the cover body 3 through insert molding or integral injection molding. The length direction of the rigid component 4 is consistent with the length direction of the battery cell assembly 2 in the battery pack. Multiple rigid components 4 can be embedded in one cover body 3. The multiple rigid components 4 are arranged at intervals according to the installation position of the battery cell assembly 2 in the battery pack. The material selection, size specifications, and quantity of the rigid component 4 can be determined according to the size of the cover body 3 and the magnitude of the expansion force of the battery cell assembly 2. Generally, it can be designed that each battery cell assembly 2 corresponds to one or more rigid components 4. For battery cell assemblies with small expansion forces, it can also be designed that one rigid component 4 corresponds to multiple sets of battery cell assemblies 2. The tensile strength corresponding to the selected material and designed size of the rigid component 4 should be greater than the tensile force distributed on the rigid component 4 by the expansion force of the battery cell assembly 2. Both ends of the rigid member 4 extend out of the cover 3, and mounting holes are designed at both ends of the rigid member 4 (rigid member connecting part 42). After the cover 3 is installed on the box 1, the cover 3 is connected to the box 1 on all sides to seal the battery pack, and the rigid member connecting part 42 is also connected to the box 1.

[0288] The portion of the rigid connecting part 42 extending beyond the edge of the cover 3 can be designed as follows: Figure 17 and Figure 18 As shown in the bending state, the rigid component 4 is fixed to the housing 1 by side mounting bolts; the two ends of the rigid component 4 can also be designed to be straight, such as... Figure 19 and Figure 20As shown, the rigid member 4 is fixed to the housing 1 by vertically installing fixing bolts on the top of the battery pack. The part of the rigid member 4 that protrudes from the cover 3 (rigid member connection part 42) needs to be treated with anti-corrosion to meet the anti-corrosion requirements of the product during long-term use.

[0289] The rigid connecting part 42 may not extend beyond the edge of the cover 3, such as Figure 21 and Figure 22 As shown, at this time, the mounting holes (connection holes and connection clearance holes 34) of the rigid component 4 need to penetrate the cover 3 and the rigid component connection part 42. The connection clearance hole 34 and the connection hole are designed to be concentric. Generally, the connection clearance hole 34 needs to be larger than the connection hole. Thus, the bolt can press the rigid component connection part 42, instead of pressing it on the non-metallic material of the cover 3. If the bolt is pressed on the non-metallic material of the cover 3, the material of the cover 3 will be crushed and damaged. The non-metallic material will also undergo creep deformation, which will cause the torque of the mounting bolt to decrease and the bolt to loosen.

[0290] Using this solution, the battery pack does not require a rigid member 4 to resist expansion forces above the individual battery cells 2 inside the battery pack, nor does it require a rigid member 4 to press the cover 3 closed on the outside. For example... Figure 2 and Figure 3 As shown, the first housing wall 13 is designed to be tightly fitted to the battery cell assembly 2 inside the housing 1, and the expansion force of the battery cell assembly 2 can be borne by the first housing wall 13 connected to the rigid member 4. In addition, the rigid member 4 is connected to the cover 3, making the battery box a rectangular block with metal parts connected on all six sides, which greatly improves the overall structural strength of the battery pack and reduces the probability of deformation or cracking of the housing 1 during transportation.

[0291] In another specific embodiment, a first partial thickening portion 36 extending along the length direction of the battery cell assembly 2 is designed on the surface of the thin-walled portion 35 facing the battery cell assembly 2. The surface of the first partial thickening portion 36 facing the battery cell assembly 2 is a plane. The height of the first partial thickening portion 36 along the first direction X is the same as the distance from the inner surface of the thin-walled portion 35 to the surface of the battery cell assembly 2 facing the thin-walled portion 35. After the cover 3 is installed on the housing 1, the inner surface of the first partial thickening portion 36 is in contact with the surface of the battery cell assembly 2 facing the thin-walled portion 35. The length of the first partial thickening portion 36 along the second direction Y generally needs to be equal to or greater than the length of the battery cell assembly 2 along the second direction Y.

[0292] The outer surface of the cover 3 can be a planar structure, with internal ribs formed by local thickening (first local thickening part 36), or the first local thickening part 36 of the internal ribs can be formed by local concavity of the cover 3. The cover 3 can be formed by vacuum forming of plastic sheet, by plastic injection molding, by molding of composite material, or by stamping of metal sheet. The cover 3 can be a flat structure, or it can be an inverted basin shape or other structural forms.

[0293] like Figure 27 As shown, taking a battery pack with four battery cell modules 2, each battery cell module 2 including thirteen battery cells 21 as an example, the battery cells 21 in each battery cell module 2 are arranged along the second direction Y, and the four battery cell modules 2 are arranged side by side along the third direction Z. The explosion-proof valve is located on the first housing wall 13.

[0294] After the cover 3 is installed onto the housing 1, the edge of the cover 3 is connected and fixed to the outer edge of the housing 1 to achieve a seal on the battery pack; the raised internal rib (first partial thickening part 36) on the inner surface of the cover 3 is located approximately in the middle of the two rows of battery cell assemblies 2, and the first partial thickening part 36 is aligned with the upper surface of the battery cell 21 (see...). Figure 24 and Figure 25 The contact surfaces of the battery modules are bonded with adhesive. Each first partial thickening part 36 is simultaneously bonded to the battery cells 21 of the two rows of battery cell modules 2. The bottom of each battery cell module 2 is bonded to the housing 1. At this time, the four rows of battery cell modules 2 form an integral battery module by bonding their tops to the first partial thickening parts 36 and their bottoms to the housing 1. The battery module itself has a certain rigidity, which can reduce the probability of the battery pack bending and sinking in the middle.

[0295] Along the length of the battery cell assembly 2, each first local thickened portion 36 is adhesively connected to all the battery cells 21 of the single-row battery cell assembly 2, which can limit the expansion of the battery cell assembly 2 along the second direction Y, resist a certain expansion force, and reduce the strength requirements of the first housing wall 13, rigid parts 4 and other anti-expansion force structural components.

[0296] by Figure 24 The orientation shown is illustrated by example. For the leftmost or rightmost battery cell assembly 2, the top of battery cell assembly 2, along the third direction Z, is closest to the casing wall of that battery cell assembly 2 (e.g., Figure 24The left side wall, thin-walled portion 35, and first partially thickened portion 36 form an exhaust channel; for the middle battery cell assembly 2, the thin-walled portion 35, the two first partially thickened portions 36, and the top surface of the battery cell assembly 2 form an exhaust channel. Along the third direction Z, the explosion-proof valve of the battery cell 21 is located in the middle of the exhaust channel, and the pressure relief outlet 133 is located on the first housing wall 13. When a single row of battery cell assemblies 2 experiences thermal runaway, the thermal runaway gas reaches the pressure relief outlet 133 through the top exhaust channel and is quickly discharged to the outside of the housing 1 through the pressure relief outlet 133. The thermal runaway gas will not enter the area where other battery cell assemblies 2 are located.

[0297] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and all should be covered within the scope of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of this application.

Claims

1. A battery device, characterized in that, include: A housing, defining a receiving cavity, the housing having an opening that opens toward a first direction; A cover, connected to the box body and closing the opening along a first direction; At least one battery cell assembly is housed in the receiving cavity. The at least one battery cell assembly includes a plurality of battery cells arranged along a second direction. The battery cell includes a housing. The housing defines a receiving space by connected housing walls. A large housing wall in the housing walls is perpendicular to the second direction. The large housing wall is the housing wall with the largest area among the housing walls. At least one rigid component, each of the rigid components including a rigid component body and a rigid component connecting portion, the rigid component connecting portion being connected to both ends of the rigid component body, the rigid component body being embedded in the cover body, the rigid component connecting portion being at least partially exposed from the cover body to the outside of the box body and being connected to the box body respectively, the box body including a first box body wall disposed opposite to each other along a second direction, the rigid component connecting portion being connected to the first box body wall respectively, the first direction and the second direction intersecting.

2. The battery device according to claim 1, characterized in that, The cover includes a first cover portion and a second cover portion connected along the first direction, and a cavity is formed between the first cover portion and the second cover portion. The rigid component body is located in the cavity, and the first cover portion and the second cover portion cover the circumferential surface of the rigid component body.

3. The battery device according to claim 2, characterized in that, The cover is formed to have a uniform thickness, the thickness direction being consistent with the first direction; or, The cover is formed having a thin-walled portion and multiple locally thickened portions. In at least one of the locally thickened portions, the first cover portion, the rigid body portion, and the second cover portion are stacked along the thickness direction, which is consistent with the first direction.

4. The battery device according to claim 1, characterized in that, The cover is configured as an insulating cover.

5. The battery device according to claim 4, characterized in that, The cover is made of resin material; or... The cover is made of a metal material with an insulating layer.

6. The battery device according to any one of claims 1 to 5, characterized in that, The rigid component connecting portion is bent relative to the rigid component main body portion. Along the second direction, the rigid member connection is located on the side of the first housing wall away from the battery cell assembly. The battery device further includes a first connector, which connects the rigid member connection portion and the first housing wall.

7. The battery device according to any one of claims 1 to 5, characterized in that, Along the first direction, the rigid member connection portion is located on the side of the first housing wall closer to the cover. The battery device further includes a second connector, which connects the rigid member connection portion and the first housing wall.

8. The battery device according to any one of claims 1 to 5, characterized in that, The rigid component connecting part is built into the cover body, the rigid component connecting part is formed with a connecting hole, and the cover body is formed with a connecting clearance hole. The battery device further includes a third connector, which passes through the connection clearance hole and the connection hole, connecting the rigid member connection portion to the first housing wall. The third connector contacts the side of the rigid member connection portion that is away from the battery cell assembly along the first direction.

9. The battery device according to any one of claims 1 to 5, characterized in that, Multiple battery cell assemblies are arranged along a third direction, and multiple rigid members are arranged along a third direction, with the first direction, the second direction, and the third direction intersecting each other; Within the projection plane projected along the first direction, the projections of each of the battery cell assemblies overlap with the projection of the main body portion of at least one of the rigid members.

10. The battery device according to claim 9, characterized in that, Within the projection plane projected along the first direction, the projection of at least one of the rigid member main body portions overlaps with the projections of two adjacent battery cell assemblies along the third direction.

11. The battery device according to claim 2, characterized in that, The cover is formed having a thin-walled portion and a plurality of locally thickened portions, the plurality of locally thickened portions including a first locally thickened portion that protrudes relative to the thin-walled portion toward the side closer to the battery cell assembly, the first locally thickened portion being in contact with the battery cell assembly.

12. The battery device according to claim 11, characterized in that, Multiple battery cell assemblies are arranged along a third direction; The first partial thickening portion contacts the shoulders of two adjacent battery cell assemblies arranged along a third direction, and the first direction, the second direction, and the third direction intersect each other.

13. The battery device according to claim 11, characterized in that, In at least one of the first partial thickening portions, the first cover portion, the rigid member body portion, and the second cover portion are stacked along the thickness direction, which is consistent with the first direction.

14. The battery device according to claim 11, characterized in that, The first local thickened portion is bonded to the battery cell assembly.

15. The battery device according to claim 11, characterized in that, Multiple battery cell assemblies are arranged along a third direction, each battery cell assembly including at least one battery cell having a pressure relief valve disposed toward the cover. Multiple first local thickened portions are arranged along the third direction. Along the first direction, there is a gap between the pressure relief valve and the thin-walled portion, and in the same projection plane projected along the first direction, the projection of the pressure relief valve is located between the projections of adjacent first partial thickening portions.

16. The battery device according to any one of claims 1 to 5, characterized in that, The housing includes a second housing wall that is opposite to the cover in a first direction, and the second housing wall is bonded to the battery cell assembly.

17. An electrical device, characterized in that, The electrical device includes the battery device according to any one of claims 1 to 16.

18. An energy storage device, characterized in that, The energy storage device includes the battery device according to any one of claims 1 to 16.

Images