Battery device, power utilization device and energy storage device

Abstract

The embodiment of the invention provides a battery device, a power utilization device and an energy storage device. Relates to the technical field of batteries. The battery device comprises a box body which defines an accommodating cavity and is provided with an opening which is opened towards a first direction; the cover body is connected to the box body and seals the opening in the first direction; the at least one battery monomer assembly is accommodated in the accommodating cavity; and each rigid piece comprises a rigid piece main body part and rigid piece connecting parts, the rigid piece connecting parts are connected to the two ends of the rigid piece main body part, the rigid piece main body part is embedded in the cover body, and at least part of the rigid piece connecting parts are exposed out of the cover body and connected with the box body. Under the condition of enhancing the mechanical strength of the battery box, the production cost of the battery box is reduced.

Description

Technical Field

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

[0002] With the promotion and popularization of the green development concept, 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 also increasingly used in energy storage fields.

[0003] In existing battery systems, a battery assembly typically includes a battery case and a battery cell assembly located within the case. To prevent deformation of the battery case, some solutions have incorporated rigid components onto the exterior of the case. However, these rigid components typically require corrosion protection or require the use of corrosion-resistant metal materials such as stainless steel, resulting in high production costs. Therefore, finding a balance between preventing battery case deformation and reducing production costs is a key area of research in the industry. Summary of the Invention

[0004] To solve the above technical problems, embodiments of the present application provide a battery device, an electrical device, and an energy storage device to simultaneously suppress deformation of the battery case and reduce the production cost of the battery case.

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

[0006] A first aspect of the present application provides a battery device, which includes: a box body, which defines a accommodating cavity, and the box body has an opening that opens in a first direction; a cover body, which is connected to the box body and closes the opening along the first direction; at least one battery cell assembly, which is accommodated in the accommodating cavity; and at least one rigid member, each rigid member includes a rigid member main body and a rigid member connecting part, the rigid member connecting part is connected to both ends of the rigid member main body, the rigid member main body is embedded in the cover body, and the rigid member connecting part is at least partially exposed from the cover body and is respectively connected to the box body.

[0007] Because the main body of the rigid member is embedded within the cover, the rigid member can enhance the strength and rigidity of the cover, inhibit deformation of the cover, such as bulging or concaving, along a first direction, and inhibit deformation of the case. For example, if some battery cells in a battery cell assembly experience thermal runaway and release gas, resulting in an increase in gas within the battery case, the rigid member can inhibit the probability of these gases causing partial bulging or even damage to the cover. It can also reduce the probability and degree of deformation of the case due to deformation of the cover, thereby improving the dimensional accuracy of the battery device's outer contour and enhancing its appearance. For another example, during the inflation test phase of the battery device assembly process, the step of tightening the cover to prevent bulging and deformation, as well as the corresponding tooling, can be eliminated, thereby reducing production costs and improving production efficiency. Furthermore, because the cover wraps around the main body of the rigid member, the area of contact between the main body of the rigid member and the outside world is reduced. Therefore, even without anti-corrosion measures, the probability of corrosion of the rigid member can be reduced. Furthermore, manufacturing is simplified, thereby reducing production costs.

[0008] In some embodiments, the cover body includes a first cover body part and a second cover body part connected along a first direction, and a cavity is formed between the first cover body part and the second cover body part; the rigid part main body is located in the cavity and the first cover body part and the second cover body part cover the circumference of the rigid part main body.

[0009] Since the main body of the rigid part is located in the cavity and the first cover part and the second cover part cover the circumference of the main body of the rigid part, the contact area between the rigid part and the external environment can be greatly reduced, the probability of the main body of the rigid part being corroded is reduced, and the degree of corrosion of the rigid part is reduced.

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

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

[0012] In some embodiments, the cover body is formed to have a thin-walled portion and multiple locally thickened portions, and in at least one locally thickened portion, the first cover body portion, the rigid part main body portion and the second cover body portion are stacked along the thickness direction, and the thickness direction is consistent with the first direction.

[0013] Thus, the thickness of the cover body can be increased at the location where the rigid member is arranged, which is beneficial to suppressing the thickness of the entire cover body, thereby helping to reduce the weight and material cost of the cover body and even the battery device.

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

[0015] Therefore, even if the rigid member is not subjected to insulation treatment (such as adding an insulating coating), the insulation problem of the rigid member can be solved, and the manufacturing process can be reduced accordingly, thereby reducing 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 a resin material, which not only increases the weight of the cover, and thus the battery device, but also provides insulation. This eliminates the need for separate insulation treatments for the rigid components and the cover, solving the insulation problem between the rigid components and the cover. Because the cover is made of a metal material with an insulating layer, it has high strength and rigidity. Furthermore, the insulating layer also insulates the outer surface of the cover.

[0018] In some embodiments, at least one battery cell assembly includes a plurality of battery cells arranged along a second direction; the box body includes first box body walls arranged opposite to each other along the second direction, the rigid member connecting parts are respectively connected to the first box body walls, and the second direction intersects with the first direction.

[0019] Since the rigid member connection parts are respectively connected to the first box wall, the first box wall can clamp the battery cell assembly along the second direction under the pulling of the rigid member, so that the battery cell assembly remains in a regularly arranged state, thereby suppressing the deformation or degree of the box due to the expansion and outward extension of the battery cell assembly.

[0020] In some embodiments, the battery cell includes a housing, the housing defines a receiving space through connected housing walls, a large-surface housing wall of the housing walls is perpendicular to the second direction, wherein the large-surface housing wall is the housing wall with the largest area.

[0021] The large-surface shell wall in the battery cell is prone to expansion and deformation due to the charging and / or discharging of the battery cell. Since the large-surface shell wall is perpendicular to the second direction, the large-surface shell wall can be subjected to a larger clamping force along the second direction. As a result, the probability or degree of deformation of the large-surface shell wall caused by expansion due to the charging and / or discharging of the battery cell can be reduced, thereby reducing the probability of deformation of the battery device or reducing the degree of deformation of the battery device.

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

[0023] Thus, the rigid component connection portions can be connected to the first box wall respectively.

[0024] In some embodiments, along the first direction, the rigid member connecting portion is located on a side of the first box wall close to the cover, and the battery device further includes a second connecting member connecting the rigid member connecting portion and the first box wall.

[0025] Thus, the rigid component connection portions can be connected to the first box wall respectively.

[0026] In some embodiments, the rigid member connecting portion is built into the cover body, the rigid member connecting portion is formed with a connecting hole, the cover body is formed with a connecting avoidance hole, the battery device also includes a third connecting member, the third connecting member is passed through the connecting avoidance hole and the connecting hole, and connects the rigid member connecting portion to the first box wall, and the third connecting member contacts the side of the rigid member connecting portion away from the battery cell assembly along the first direction.

[0027] As a result, the rigid member connecting portions can be connected to the first housing wall. Furthermore, because the rigid member connecting portions are built into the cover, the rigid member can be positioned as much as possible within the cover, improving the rigid member's corrosion resistance. Because the cover includes a connection avoidance hole, the third connector contacts the side of the rigid member connecting portion that faces away from the battery cell assembly in the first direction. This reduces the risk of insufficient fastening due to cover deformation. For example, if the cover is made of a resin material, this reduces the risk of loosening the fastening between the third connector and the rigid member connecting portion due to cover creep.

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

[0029] In this way, the expansion force of the battery cell assembly can be evenly borne by multiple rigid parts, reliably reducing the probability of the battery cell assembly expanding due to charging and / or discharging or reducing the degree of expansion of the battery cell assembly due to charging and / or discharging, thereby reducing the probability of deformation of the battery device or reducing the degree of deformation of the battery device.

[0030] In some embodiments, within a projection plane projected along the first direction, a projection of the main body of at least one rigid member and projections of two adjacent battery cell assemblies along the third direction both have overlapping portions.

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

[0032] In some embodiments, the cover is formed to have a thin-walled portion and multiple locally thickened portions, the multiple locally thickened portions including a first locally thickened portion protruding toward a side close to the battery cell assembly relative to the thin-walled portion, and the first locally thickened portion contacts the battery cell assembly.

[0033] The first locally thickened portion can enhance the strength and rigidity of the cover, improving its ability to resist deformation. Furthermore, because the first locally thickened portion contacts the battery cell assembly, it can apply pressure along the first direction to the battery cell assembly, securing the relative position of the battery cell assembly and reducing the probability of the battery cell assembly shaking or misaligning along the first direction.

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

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

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

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

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

[0039] Because the first localized thickening is bonded to the battery cell assembly, multiple battery cell assemblies and the cover body form a single unit, increasing the rigidity of the battery device along the third direction and reducing the probability or degree of deformation of the battery device along the first direction. Furthermore, for example, if the cover body serves as the top cover of the battery device, the first localized thickening is bonded to the battery cell assembly. The first localized thickening can apply a tensile force along the first direction to the battery cell assembly, reducing the pressure exerted by the battery cell assembly on the lower support members of the housing, thereby increasing the overall structural strength and rigidity of the housing. This facilitates design efforts to reduce the strength of the housing, such as by thinning the housing or reducing reinforcement beams, thereby achieving cost and weight reduction. Furthermore, because the first localized 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, the battery cell assembly includes at least one battery cell, and the battery cell has a pressure relief valve arranged toward the cover body; a plurality of first local thickening portions are arranged along the 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 local thickening portions.

[0041] Since 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 local thickened portions within the same projection plane projected along the first direction, the first local thickened portions and thin-walled portions adjacent to each other along the third direction and the battery cell assembly can define a pressure relief channel, and the gas released when the pressure relief valve is flushed open can flow in a direction along the pressure relief channel, thereby reducing the probability that the gas released when the pressure relief valve is flushed open will cause damage to the battery device.

[0042] In some embodiments, the box body includes a second box body wall opposite to the cover body along the first direction, and the second box body wall is bonded to the battery cell assembly.

[0043] Since the second box wall is bonded to the battery cell assembly, multiple groups of battery cell assemblies are formed into a whole through the second box wall, thereby improving the rigidity of the battery device along the third direction and reducing the probability of deformation of the battery device along the first direction or reducing the degree of deformation of the battery device along the first direction.

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

[0045] Since the electrical device includes the battery device provided above, the battery device can take into account both suppressing box deformation and reducing manufacturing costs, thereby correspondingly improving the reliability of the electrical device and reducing the production cost and maintenance cost of the electrical device.

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

[0047] Since the energy storage device includes the battery device provided above, the battery device can take into account both suppressing box deformation and reducing manufacturing costs, thereby correspondingly improving the reliability of the energy storage device and reducing the production cost and maintenance cost of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application; Figure 2 A schematic diagram of the three-dimensional structure of a battery device provided in some embodiments of the present application; Figure 3 An exploded perspective schematic diagram of a battery device provided in some embodiments of the present application; Figure 4 An exploded perspective diagram of a battery cell provided in some embodiments of the present application; Figure 5 A schematic top view of a cover provided in some embodiments of the present application; Figure 6 Some embodiments of this application provide Figure 5 AA cross-sectional diagram; Figure 7 Some embodiments of this application provide Figure 6 A1 region enlarged schematic diagram; Figure 8 A schematic top view of a cover provided in some other embodiments of the present application; Figure 9 Some embodiments of this application provide Figure 8 BB cross-sectional diagram; Figure 10 Some embodiments of this application provide Figure 9 A magnified schematic diagram of the B1 area; Figure 11 A schematic top view of a cover provided in some other embodiments of the present application; Figure 12 Some embodiments of this application provide Figure 11 Schematic diagram of CC cross section; Figure 13 Some embodiments of this application provide Figure 12 Schematic diagram of the C1 region; Figure 14 A schematic top view of a cover provided in some further embodiments of the present application; Figure 15 Some embodiments of this application provide Figure 14DD cross-sectional diagram; Figure 16 Some embodiments of this application provide Figure 15 Schematic diagram of the D1 region; Figure 17 A schematic diagram of the three-dimensional structure of the cover and the rigid member provided in some embodiments of the present application; Figure 18 Some embodiments of this application provide Figure 17 Schematic diagram of the E1 region; Figure 19 Schematic diagram of the three-dimensional structure of the cover and the rigid member provided in some other embodiments of the present application; Figure 20 Some embodiments of this application provide Figure 19 A magnified schematic diagram of the F1 region; Figure 21 A schematic diagram of the three-dimensional structure of a cover body and a rigid member provided in some further embodiments of the present application; Figure 22 Some embodiments of this application provide Figure 21 Schematic diagram of the G1 region; Figure 23 A schematic structural diagram of a battery device provided in some other embodiments of the present application; Figure 24 Some embodiments of this application provide Figure 23 Schematic diagram of HH section; Figure 25 Some embodiments of this application provide Figure 23 Schematic diagram of section II; Figure 26 Schematic diagram of the three-dimensional structure of the battery device provided in some other embodiments of the present application; Figure 27 Schematic diagram of the three-dimensional structure of the battery device with the cover removed provided in some other embodiments of the present application.

[0049] Description of Reference Numerals 1000, vehicle; 100, battery device; 200, controller; 300, motor; 1, housing; 11, accommodating chamber; 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, housing; 211, large housing wall; 3, cover; 31, first cover portion; 32 , second cover part; 34, connection avoidance hole; 35, thin-walled part; 36, first local thickening part; 4, rigid part; 41, rigid part main body; 42, rigid part connection part; 51, first connection part; 52, second connection part; 53, third connection part; 6, gap; 7, electrode assembly; 7a, positive ear; 7b, negative ear; 8, electrode terminal; 9, pressure relief valve; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0050] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions.

[0052] In the description of the embodiments of this application, the technical terms "first," "second," "third," etc. are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0053] Mention of "embodiment" in this document means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution. 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 that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. Unless otherwise specified, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0054] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0055] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0056] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0057] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0058] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "projection" refers to the orthographic projection of parallel projection lines perpendicular to the projection surface.

[0059] Below, this application is described in detail.

[0060] In existing battery systems, a battery assembly typically includes a battery case and a battery cell assembly located within the case. To prevent deformation of the battery case, some solutions have incorporated rigid components onto the exterior of the case. However, these rigid components typically require corrosion protection or require the use of corrosion-resistant metal materials such as stainless steel, resulting in high production costs. Therefore, finding a balance between preventing battery case deformation and reducing production costs is a key area of research in the industry.

[0061] After research, it was found that if most of the rigid parts are set inside the cover body (the rigid parts are embedded in the cover body), forming a structure in which the cover body wraps most of the rigid parts and only the part used for connection is exposed from the cover body, then on the one hand, the strength and rigidity of the cover body can be enhanced by the rigid parts, and the ability of the cover body to resist deformation can be improved. On the other hand, the exposed part of the rigid parts can be reduced, reducing the probability or degree of corrosion of the rigid parts. Therefore, even if no additional anti-corrosion measures are implemented on the rigid parts, it is possible to take into account both the suppression of deformation of the battery box and the reduction of the production cost of the battery box.

[0062] Based on such a design concept, an embodiment of the present application provides a battery device, which includes: a box body, which defines a accommodating cavity, and the box body has an opening that opens in a first direction; a cover body, which is connected to the box body and closes the opening along the first direction; at least one battery cell assembly, which is accommodated in the accommodating cavity; at least one rigid member, each rigid member includes a rigid member main body and a rigid member connecting part, the rigid member connecting part is connected to both ends of the rigid member main body, the rigid member main body is embedded in the cover body, and the rigid member connecting part is at least partially exposed from the cover body and is respectively connected to the box body.

[0063] Because the main body of the rigid member is embedded within the cover, the rigid member can enhance the strength and rigidity of the cover, inhibit deformation of the cover, such as bulging or concaving, along a first direction, and inhibit deformation of the case. For example, if some battery cells in a battery cell assembly experience thermal runaway and release gas, resulting in an increase in gas within the battery case, the rigid member can inhibit the probability of these gases causing partial bulging or even damage to the cover. It can also reduce the probability and degree of deformation of the case due to deformation of the cover, thereby improving the dimensional accuracy of the battery device's outer contour and enhancing its appearance. For another example, during the inflation test phase of the battery device assembly process, the step of tightening the cover to prevent bulging and deformation, as well as the corresponding tooling, can be eliminated, thereby reducing production costs and improving production efficiency. Furthermore, because the cover wraps around the main body of the rigid member, the area of contact between the main body of the rigid member and the outside world is reduced. Therefore, even without anti-corrosion measures, the probability of corrosion of the rigid member can be reduced. Furthermore, manufacturing is simplified, thereby reducing production costs.

[0064] The battery device provided in the embodiments of the present application can be used in, but is not limited to, electrical devices such as vehicles, ships, or aircraft.

[0065] An embodiment of the present application further provides an energy storage device including the above-mentioned battery device. The energy storage device may include an energy storage container, an energy storage cabinet, etc.

[0066] The present application also provides an electrical device including the battery device described above. The electrical device may include, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, an aircraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0067] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present application is taken as an example of a vehicle 1000 .

[0068] Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1 As shown, a battery device 100 is installed inside vehicle 1000. Battery device 100 can be installed at the bottom, front, or rear of vehicle 1000. Battery device 100 can be used to power vehicle 1000. For example, battery device 100 can serve as an operating power source for vehicle 1000. Vehicle 1000 can also include a controller 200 and a motor 300. Controller 200 is used to control battery device 100 to power motor 300, for example, to meet the power requirements of vehicle 1000 during startup, navigation, and driving.

[0069] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0070] Figure 2 A schematic diagram of the three-dimensional structure of a battery device provided in some embodiments of the present application; Figure 3 An exploded perspective schematic diagram of a battery device provided in some embodiments of the present application; Figure 4 This is a schematic exploded perspective view of a battery cell provided in some embodiments of the present application.

[0071] The battery apparatus mentioned in the embodiments of the present 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 hybrid via a busbar.

[0072] In some embodiments, a battery cell assembly 2 is typically formed by arranging multiple battery cells 21. For example, one or more battery cell assemblies 2 may form a battery module, which is composed of multiple battery cell assemblies 2 arranged and fixed together to form a single module. For example, a battery module may be formed by bundling multiple battery cell assemblies 2 together using cable ties.

[0073] In some embodiments, the battery device may be a battery pack, which includes a battery box and one or more battery cell assemblies 2 , wherein the battery cell assemblies 2 are housed in the battery box.

[0074] As an example, one or more battery cell assemblies 2 may constitute a battery module, and the battery cell assemblies 2 may be housed in a battery box by fixing the battery module in the battery box.

[0075] As an example, the battery cell assembly 2 may also be housed in the battery box by directly fixing the plurality of battery cells 21 to the battery box.

[0076] As an example, Figure 3 As shown, the battery case may include a cover 3 and a case 1. The cover 3 and case 1 snap together to form an enclosed space within the battery case for accommodating the battery cell assemblies 2. Enclosed here means covered or closed, and can be either sealed or unsealed. The cover 3 can be a top cover, side cover, or bottom cover.

[0077] In the embodiment of the present application, the battery cell 21 may be a secondary battery. A secondary battery refers to a battery cell 21 that can be continuously used by activating active materials by charging after the battery cell 21 is discharged.

[0078] The battery cell 21 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiment of the present application.

[0079] like Figure 4 As shown, a battery cell 21 generally includes an electrode assembly 7. The electrode assembly 7 comprises a positive electrode, a negative electrode, and a separator. During the charging and / or discharging process of the battery cell 21, active ions (e.g., lithium ions) are intercalated and released between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0080] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0081] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0082] In some embodiments, a positive electrode may utilize a metal foam. The metal foam may include nickel foam, copper foam, aluminum foam, alloy foam, or the like. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not include a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled or / and deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0083] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0084] In some embodiments, the electrode assembly 7 further includes a separator, which is disposed between the positive electrode and the negative electrode.

[0085] In some embodiments, the separator is a separator. The present invention has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be used.

[0086] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0087] In some embodiments, the battery cell 21 also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present invention does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0088] In some embodiments, the electrode assembly 7 is a wound structure in which the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0089] In some embodiments, the electrode assembly 7 is a laminated structure.

[0090] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0091] As an example, multiple positive electrode sheets may be provided, and the negative electrode sheet is folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0092] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0093] As an example, multiple separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0094] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0095] In some embodiments, the shape of the electrode assembly 7 can be cylindrical, flat, or polygonal.

[0096] In some embodiments, as Figure 4 As shown, the electrode assembly 7 is provided with tabs, which can lead current out of the electrode assembly 7. The tabs include a positive tab 7a and a negative tab 7b.

[0097] In some embodiments, the battery cell 21 may include a housing 210. The housing is used to encapsulate the electrode assembly 7 and other components such as the electrolyte. The housing may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film.

[0098] As an example, the battery cell 21 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery cell. The polygonal battery cell is, for example, a hexagonal battery cell, etc. There is no special limitation in the embodiments of the present application.

[0099] In some embodiments, a pressure relief valve 9 is provided on the housing to release the internal pressure of the battery cell 21 .

[0100] Below, refer to Figures 2 to 27 Some embodiments of the present application are described in detail.

[0101] In the description of the embodiments of this application, for ease of explanation, the direction of arrow X is referred to as the "first direction X," the direction of arrow Y is referred to as the "second direction Y," and the direction of arrow Z is referred to as the "third direction Z." The first direction X, the second direction Y, and the third direction Z intersect with each other and are not coplanar. In some embodiments, the first direction X, the second direction Y, and the third direction Z intersect with each other at right angles.

[0102] A first aspect of an embodiment of the present application provides a battery device, such as Figure 2 、 Figure 3As shown, the battery device includes: a box body 1, which defines a accommodating cavity 11, and the box body 1 has an opening 12 that opens in a first direction X; a cover body 3, which is connected to the box body 1 and closes the opening 12 along the first direction X; at least one battery cell assembly 2, which is accommodated in the accommodating cavity 11; at least one rigid member 4, each rigid member 4 includes a rigid member main body 41 and a rigid member connecting part 42, the rigid member connecting part 42 is connected to both ends of the rigid member main body 41, the rigid member main body 41 is embedded in the cover body 3, and the rigid member connecting part 42 is at least partially exposed from the cover body 3 and is respectively connected to the box body 1.

[0103] In some embodiments, as Figure 2 and Figure 3 As shown, the box body 1 and the cover body 3 are aligned along the first direction X, and the cover body 3 closes the opening 12 of the box body 1. The accommodating cavity 11 can accommodate the battery cell assembly 2.

[0104] Optionally, the number of battery cell assemblies 2 may be one, two, three or more.

[0105] In some embodiments, the battery cell assembly 2 includes one or more battery cells 21. When the battery cell assembly 2 includes a plurality of battery cells 21, the plurality of battery cells 21 in the same battery cell assembly 2 may be arranged along the second direction Y or the third direction Z.

[0106] Optionally, when there are multiple battery cell assemblies 2 , the multiple battery cell assemblies 2 may be arranged along the first direction X, the second direction Y, or the third direction Z.

[0107] In a specific embodiment, Figure 3 As shown, a plurality of battery cell assemblies 2 are arranged along a third direction Z, and a plurality of battery cells 21 in the same battery cell assembly 2 are arranged along a second direction Y.

[0108] In some embodiments, as Figures 5 to 22 As shown, the rigid part 4 includes a rigid part main body 41 and a rigid part connecting part 42 connected to the rigid part main body 41. The rigid part connecting parts 42 are provided at both ends of the rigid part main body 41 along the second direction Y. The rigid part main body 41 is located in the cover body 3 (embedded in the cover body 3), and the rigid part connecting part 42 is connected to the box body 1.

[0109] Optionally, the rigid member main body portion 41 and the rigid member connecting portion 42 may be an integral part or a separate structure.

[0110] In some embodiments, the rigid member 4 is made of high-strength spring steel or carbon steel.

[0111] In some embodiments, a portion (eg, the rigid component main body 41 ) or the entire rigid component 4 may be made of a fiber-reinforced composite resin material.

[0112] Optionally, the material of the rigid member main body 41 and the material of the rigid member connecting portion 42 can be the same or different. For example, the rigid member main body 41 is made of fiber reinforced composite resin material, and the rigid member connecting portion 42 is made of steel material.

[0113] In some embodiments, the cover 3 is made of a non-metallic material. For example, 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.

[0114] In some embodiments, part of the cover body 3 is made of metal material, and an insulating layer is provided on the outer surface of the cover body 3 , which can insulate the outer surface of the cover body 3 .

[0115] In some specific embodiments, the cover 3 is made of non-metallic material, and the rigid component 4 is made of steel.

[0116] Optionally, the rigid member 4 and the cover body 3 are integrally injection molded, for example, by insert molding.

[0117] Optionally, the cover 3 may be formed integrally with the cover by being sandwiched between multiple layers of resin material.

[0118] Optionally, the number of the rigid members 4 may be one or more.

[0119] In some embodiments, as Figure 2 、 Figure 3 、 Figures 5 to 22 As shown, there can be multiple rigid members 4. The multiple rigid members 4 can be arranged along the third direction Z in substantially parallel or non-parallel manner.

[0120] In some embodiments, as Figure 3 As shown, the arrangement direction of the plurality of rigid members 4 may be substantially the same as the arrangement direction of the plurality of battery cell assemblies 2. Alternatively, the arrangement direction of the plurality of rigid members 4 may also intersect with the arrangement direction of the plurality of battery cell assemblies 2.

[0121] In some embodiments, as Figure 3 As shown, the extending direction of the rigid member 4 may be substantially the same as the arrangement direction of the battery cells 21 in the same battery cell assembly 2. Alternatively, the extending direction of the rigid member 4 may intersect with the arrangement direction of the battery cells 21 in the same battery cell assembly 2.

[0122] In a specific embodiment, Figure 3As shown, multiple battery cell assemblies 2 are arranged along a third direction Z; the battery cells 21 within the same battery cell assembly 2 are arranged with their large housing walls 211 facing each other. For example, the battery cells 21 within the same battery cell assembly 2 are arranged along a second direction Y, with the large housing walls 211 of each battery cell 21 within the same battery cell assembly 2 being substantially perpendicular to the second direction Y. The large housing wall 211 of a battery cell 21 refers to the housing wall with the largest outer surface area of the battery cell 21's outer shell. Multiple rigid members 4 are arranged along the third direction Z, with each rigid member 4 extending along the second direction Y.

[0123] In some embodiments, the number of battery cell assemblies 2 and the number of rigid members 4 may be the same or different.

[0124] In some embodiments, 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 main body 41.

[0125] For example, a plurality of battery cell assemblies 2 are arranged along the third direction Z, and a plurality of rigid members 4 are arranged along the third direction Z. In 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, Figure 3 As shown, in the same projection plane projected along the first direction X, the projection of the right end of the first battery cell assembly 2 from the left and the projection of the left end of the second battery cell assembly 2 from the left are both aligned with the same rigid member main body 41 (for example Figure 3 The projection of the first rigid member main body portion 41 from the left is shown to have overlapping portions.

[0126] For example, multiple battery cell assemblies 2 are arranged along the third direction Z, and multiple rigid members 4 are arranged along the third direction Z. Within 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 rigid member main bodies 41. For example, the projection of one rigid member main body 41 is located roughly in the middle of the projection of one battery cell assembly 2.

[0127] Next, a description will be given of a case where the rigid member 4 is embedded in the cover 3 .

[0128] The rigid member 4 being embedded in the cover 3 means that at least a portion of the rigid member 4 is embedded in the gap in the cover 3. Furthermore, when projecting the cover 3 and the rigid member 4 along the first direction X, the second direction Y, and the third direction Z, the projections of the cover 3 and the rigid member 4 may overlap in at least two of the projections. Furthermore, the gap in the cover 3 may have at least a continuous peripheral wall around its entire circumference, and at least a portion of the rigid member 4 may be surrounded by this continuous peripheral wall.

[0129] In some embodiments, 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 (eg Figure 3 The upper surface shown in FIG) is larger than the surface of the rigid member main body 41 facing away from the battery cell assembly 2 (eg Figure 3 The upper surface shown in FIG3 is further away from the battery cell assembly 2; the surface of the cover 3 facing the battery cell assembly 2 (eg Figure 3 The lower surface shown in FIG) is larger than the surface of the rigid member main body 41 facing the battery cell assembly 2 (eg Figure 3 The lower surface (shown as the lower surface) is closer to the battery cell assembly 2. Specifically, when projected along the first direction X, the projection of the cover 3 covers the projection of the rigid member main body 41. Furthermore, when projected along the third direction Z, the projection of the cover 3 covers the projection of the rigid member main body 41. In other words, along the thickness direction of the cover 3, both sides of the rigid member main body 41 are covered by portions of the cover 3.

[0130] In order to achieve the connection between the rigid member 4 and the box body 1, the rigid member connecting portion 42 can be exposed from the cover body 3. The rigid member connecting portion 42 being exposed from the cover body 3 includes any of the following situations: the situation where the rigid member connecting portion 42 is not embedded in the cover body 3 (the rigid member connecting portion 42 is entirely located outside the cover body 3), the situation where the rigid member connecting portion 42 is embedded in the cover body 3 but a portion of the rigid member connecting portion 42 is exposed to the external environment by opening a hole in the cover body 3, etc. (a portion of the rigid member connecting portion 42 is exposed from the cover body 3).

[0131] Regarding the connection method between the rigid member connecting portion 42 and the box body 1, in some embodiments, such as Figure 3 、 Figures 17 to 22 As shown, the rigid member connecting portion 42 can be connected to the box body 1 through a connecting member such as a bolt, for example, at least a portion of the connecting member passes through the rigid member connecting portion 42 and the box body 1, thereby connecting the rigid member connecting portion 42 and the box body 1 together, and thus connecting the cover body 3 and the box body 1 together.

[0132] In some specific embodiments, such as Figure 3 As shown, the box body 1 has first box body walls 13 arranged opposite to each other along the second direction Y, and each rigid member connecting portion 42 is connected to the first box body wall 13 respectively. Figure 3 、 Figure 17 and Figure 18 As shown, the rigid member connecting portion 42 is connected to the surface of the first box wall 13 that is away from the battery cell assembly 2 along the second direction Y (for example Figure 3 front surface shown) contact connection. or Figure 3 、 Figures 19 to 22 As shown, the rigid member connecting portion 42 and the surface of the first box wall 13 along the first direction X facing the rigid member connecting portion 42 (for example Figure 3 upper surface shown) contact connection.

[0133] In some embodiments, at least the portion of the box body 1 connected to the rigid component connection portion is made of metal.

[0134] Because the rigid member main body 41 is located within the cover 3, the rigid member 4 enhances the strength and rigidity of the cover, suppresses deformation of the cover 3, such as bulging or concaving, along the first direction X, and also suppresses deformation of the case. For example, if some battery cells in the battery cell assembly 2 experience thermal runaway and release gas, resulting in an increase in gas within the battery case, the rigid member 4 can suppress the probability of these gases causing partial bulging or even damage to the cover. It also reduces the probability and extent of deformation of the cover 3, thereby improving the dimensional accuracy of the battery device and enhancing its appearance. For another example, during the inflation test phase of the battery device assembly process, the step of tightening the cover 3 to prevent bulging and deformation, as well as the corresponding tooling, can be eliminated, thereby reducing production costs and improving efficiency. Furthermore, because the cover 3 encases the rigid member main body, the area of contact between the rigid member and the outside world is reduced. Therefore, even without anti-corrosion measures, the probability of corrosion can be reduced. Furthermore, manufacturing is simplified, thus reducing production costs.

[0135] In some embodiments, as Figures 5 to 16 As shown, the cover body 3 includes a first cover body part 31 and a second cover body part 32 connected along a first direction X, and a cavity is formed between the first cover body part 31 and the second cover body part 32; the rigid part main body part 41 is located in the cavity and the first cover body part 31 and the second cover body part 32 cover the circumference of the rigid part main body part.

[0136] In some embodiments, along the first direction X, both sides of the rigid component main body 41 are covered with a cover body 3, and along the third direction Z, both sides of the rigid component main body 41 are covered with a cover body 3, that is, the circumference of the rigid component main body 41 perpendicular to the second direction Y is covered with a cover body 3.

[0137] The present application does not impose any specific restrictions on the size and shape of the cavity, as long as it can accommodate the rigid body portion 41. In a specific embodiment, the dimensions of the cavity are similar to the dimensions of the outer contour 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.

[0138] like Figure 7 、 Figure 10 、 Figure 13 and Figure 16 As shown, along the first direction X, the cover body 3 located on the side of the dotted line L1 away from the battery cell assembly 2 is the first cover body part 31, and along the first direction X, the cover body 3 located on the side of the dotted line L1 close to the battery cell assembly 2 is the second cover body part 32, wherein the dotted line L1 is a virtual line set to illustrate the positional relationship between the rigid member 4 and the cover body parts around it, and does not mean that the cover body 3 is divided at the position of the dotted line L1. In addition, as long as a cavity with a continuous peripheral wall is formed between the first cover body part 31 and the second cover body part 32 connected along the first direction X, the distinguishing position of the two cover body parts (i.e., the position of the dotted line L1) is not limited to the position shown in the figure.

[0139] 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 piece. Of course, the first cover portion 31 and the second cover portion 32 can also be separate structures.

[0140] Since the main body 41 of the rigid part is located in the cavity and the first cover part 31 and the second cover part 32 cover the circumference of the main body of the rigid part, the contact area between the rigid part 4 and the external environment can be greatly reduced, the probability of the main body of the rigid part being corroded is reduced, and the degree of corrosion of the rigid part is reduced.

[0141] Since a cavity is formed between the first cover portion 31 and the second cover portion 32 , the thickness of at least the position where the first cover portion 31 and the second cover portion 32 are located increases compared to a case where there is no cavity.

[0142] Optionally, in some embodiments, Figures 14 to 16 As shown, the cover 3 is formed to have a uniform thickness, with the thickness direction aligned with the first direction X. In other words, the cover 3 does not have a significant locally thickened portion at the location of the first cover portion 31 and the second cover portion 32 (or, in other words, at the location of the rigid member main body 41). Instead, the cover 3 has a substantially uniform thickness in the surrounding area and even throughout the entire cover 3, exceeding the dimension of the rigid member main body 41 along the first direction X. In this case, it can be considered that the thickness of the entire cover 3 has increased.

[0143] Thus, the cover 3 can be formed into a shape in which both surfaces facing each other in the first direction are flat or substantially flat.

[0144] Optionally, in some embodiments, Figures 5 to 13 As shown, the cover body 3 is formed to have a thin-walled portion 35 and multiple locally thickened portions. In at least one locally thickened portion, the first cover body portion 31, the rigid part main body portion 41 and the second cover body portion 32 are stacked along the thickness direction, and the thickness direction is consistent with the first direction X.

[0145] In some embodiments, part of the cover 3 is thickened to form a local thickening portion. Figure 6 、 Figure 7 、 Figure 9 、 Figure 10 、 Figure 12 、 Figure 13 As shown, the locally thickened portion may be located on one side or both sides of the thin-walled portion 35 along the first direction X.

[0146] Specifically, if Figure 6 、 Figure 7 As shown, the second cover portion 32 is connected to the thin-walled portion 35 to form a cover portion covering the opening of the box body 1, and the first cover portion 31 becomes a partially raised portion relative to the cover portion; or, as shown Figure 9 、 Figure 10 、 Figure 12 、 Figure 13 As shown, the first cover portion 31 and the thin-walled portion 35 are connected to form a cover portion that covers the opening of the box body 1, and the second cover portion 32 is a partially raised portion relative to the cover portion. In other words, the cover body 3 forms a locally thickened portion at the location where the first cover portion 31 and the second cover portion 32 are located (or, in other words, where the rigid member main body 41 is located).

[0147] Optionally, the thickness of the first cover portion 31 and the second cover portion 32 can be the same or different. Figure 7 、 Figure 10 As shown, the first cover portion 31 is thinner than the thin-walled portion 35, or vice versa; or Figure 13 As shown, the thickness of the first cover portion 31 and the thin-walled portion 35 are substantially the same. 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 greater 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.

[0148] In some embodiments, the locally thickened portion can 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 component main body 41 is embedded in the thin-walled portion 35, and an avoidance groove is provided on the side wall of the box (for example, the first box wall), thereby exposing the rigid component connection portion 42 to the outside.

[0149] Optionally, the plurality of locally thickened portions may be arranged along the second direction Y, and / or the plurality of locally thickened portions may be arranged along the third direction Z.

[0150] Therefore, the thickness of the cover 3 can be increased at the location where the rigid member 4 is arranged, which is beneficial to suppressing the overall thickness of the cover 3, thereby facilitating reduction in the weight and material cost of the cover and even the battery device.

[0151] It is understood that the first cover portion 31, at least part of the rigid body portion 41, and the second cover portion 32 may be stacked in the thickness direction in at least one locally thickened portion. The rigid body portion 41 may not be provided in at least one locally thickened portion.

[0152] In some embodiments, the cover 3 is configured as an insulating cover 3 .

[0153] Optionally, the outer surface of the cover 3 is insulated or the entire cover 3 is made of an insulating material.

[0154] Therefore, the insulation problem of the rigid member 4 can be solved without performing insulation treatment on the rigid member 4 separately, thereby reducing the assembly process and lowering the production cost of the battery device.

[0155] In some embodiments, the cover 3 is made of a resin material. Alternatively, the cover 3 is made of a metal material with an insulating layer.

[0156] Exemplarily, the cover 3 is made of fiber-reinforced resin composite material.

[0157] The cover 3 is made of a resin material, which not only increases the weight of the cover 3 and, by extension, the battery device, but also provides insulation. This eliminates the need for separate insulation treatments for the rigid member 4 and the cover 3, effectively solving the insulation problem between the rigid member 4 and the cover 3. Because the cover 3 is made of a metal material with an insulating layer, it possesses high strength and rigidity. Furthermore, the insulating layer of the metal material also insulates the outer surface of the cover 3.

[0158] In some embodiments, 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 box body 1 includes first box body walls 13 arranged relatively along the second direction Y, and the rigid member connecting parts 42 are respectively connected to the first box body walls 13, and the second direction Y intersects with the first direction X.

[0159] Optionally, the battery cell assembly 2 may include two, three, four or more battery cells 21 arranged along the second direction Y.

[0160] In some embodiments, the battery cell 21 includes a shell, and the shell defines a accommodating space through connected shell walls. The shell may be a large-surface shell wall 211 in the shell wall perpendicular to the second direction Y, or a small-surface shell wall in the shell wall perpendicular to the second direction Y, wherein the large-surface shell wall 211 is the shell wall with the largest outer surface area in the shell wall, and the small-surface shell wall is the shell wall in the shell wall where no pole is set and the shell wall with the smallest outer surface area that is not opposite to the shell wall in the shell wall where the pole is set.

[0161] In some implementations, along the second direction Y, one side of the first box wall 13 has a reinforcing rib 131 , thereby increasing the strength of the first box wall 13 .

[0162] In some implementations, 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. This not only strengthens the first housing wall 13 but also saves space within the housing 1. Furthermore, the side of the first housing wall 13 facing the battery cell assembly 2 can be generally flat. In some embodiments, this flat surface of the first housing wall 13 abuts against the outer surface of the battery cell assembly 2.

[0163] In some embodiments, there are multiple reinforcing ribs 131 , and the multiple reinforcing ribs 131 are cross-arranged, thereby further strengthening the strength of the first box wall 13 .

[0164] In some embodiments, the first box wall 13 is made of metal. Optionally, at least the portion of the first box wall 13 that contacts the battery cell assembly 2 is insulated.

[0165] The specific connection structure between the rigid component connection portion 42 and the first box wall 13 will be described in detail below.

[0166] Since the rigid member connecting portion 42 is respectively connected to the first box wall 13, under the pulling 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 remains in a regularly arranged state, thereby suppressing the deformation or degree of the box due to the expansion and outward extension of the battery cell assembly 2.

[0167] In some embodiments, as Figure 3 As shown, the battery cell 21 includes a shell, which defines a receiving space through connected shell walls. The large shell wall 211 in the shell walls is perpendicular to the second direction Y, wherein the large shell wall 211 is the shell wall with the largest area.

[0168] like Figure 4 As shown, the battery cell 21 includes a housing 210 and an electrode assembly 7 located within the housing.

[0169] In some embodiments, the electrode assembly 7 is a laminated structure, and the positive electrode, the negative electrode, and the separator in the electrode assembly 7 are arranged along the second direction Y.

[0170] In some embodiments, the electrode assembly 7 is a wound structure, and the electrode assembly 7 has a straight area and a corner area. The positive electrode, the negative electrode, and the separator located in the straight area are arranged along the second direction Y.

[0171] In some embodiments, the expansion degree of the battery cell 21 along the arrangement direction of the positive electrode, the negative electrode and the separator is greater than the expansion degree of the battery cell 21 along the direction intersecting the arrangement direction of the positive electrode, the negative electrode and the separator. Figure 4 In the embodiment shown, it is generally believed that the expansion degree of the battery cell 21 along the second direction Y is greater than the expansion degree of the battery cell 21 along the first direction X, and the expansion degree of the battery cell 21 along the second direction Y is greater than the expansion degree of the battery cell 21 along the third direction Z.

[0172] The large-surface shell wall 211 in 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, the large-surface shell wall 211 can be subjected to a large clamping force (restraint force) along the second direction Y exerted by the rigid component 4 and the first box wall 13. As a result, the probability or degree of deformation of the large-surface shell wall caused by expansion due to the charging and / or discharging of the battery cell 21 can be reduced, thereby reducing the probability of deformation of the battery device or reducing the degree of deformation of the battery device.

[0173] Below, further reference Figures 17 to 22 The specific connection structure between the rigid component connection portion 42 and the first box wall 13 is described below.

[0174] In some embodiments, as Figure 2 、 Figure 17 and Figure 18 As shown, the rigid member connecting portion 42 is bent relative to the rigid member main body portion 41. Along the second direction Y, the rigid member connecting portion 42 is located on the side of the first box wall 13 away from the battery cell assembly 2. The battery device also includes a first connecting member 51, which connects the rigid member connecting portion 42 and the first box wall 13.

[0175] In some embodiments, the rigid component connecting portion 42 is bent relative to the rigid component main body portion 41 , and the rigid component connecting portion 42 extends along the first direction X.

[0176] In some embodiments, the first connecting member 51 may be a threaded fastener that passes through the rigid member connecting portion 42 and the first box wall 13 in sequence, with the head abutting against the rigid member connecting portion 42. Optionally, a washer may be further provided between the head and the rigid member connecting portion 42.

[0177] In some embodiments, as Figure 3 As shown, the first box wall 13 has a first mounting boss 132 , and the first connecting member 51 connects the rigid member connecting portion 42 to the first mounting boss 132 .

[0178] In some embodiments, the first mounting boss 132 is formed by thickening a portion of the first box wall 13 , thereby improving the strength and rigidity of the first box wall 13 at the position where it is connected to the first connecting member 51 .

[0179] In some embodiments, each first box wall 13 and each rigid member connecting portion 42 may be connected via one or more first connecting members 51 .

[0180] Optionally, the first connecting member 51 may be a bolt or a screw.

[0181] Thus, the rigid member connecting portions 42 can be connected to the first box wall 13 respectively.

[0182] In some embodiments, as Figure 3 、 Figure 19 and Figure 20 As shown, along the first direction X, the rigid member connecting portion 42 is located on a side of the first box wall 13 close to the cover 3 , and the battery device further includes a second connecting member 52 , which connects the rigid member connecting portion 42 and the first box wall 13 .

[0183] In some embodiments, the rigid member connecting portion 42 extends along the second direction Y.

[0184] In some embodiments, the second connecting member 52 may be a threaded fastener. The second connecting member 52 passes through the rigid member connecting portion 42 and is inserted into the first box wall 13 from an end portion of the first box wall 13 and fastened thereto.

[0185] In some embodiments, the first box wall 13 has a second mounting boss (not shown), and the second connecting member 52 connects the rigid member connecting portion 42 to the second mounting boss.

[0186] In some embodiments, the second mounting boss is formed by thickening a portion of the first box wall 13 , thereby improving the strength and rigidity of the first box wall 13 at the position where it is connected to the second connecting member 52 .

[0187] Optionally, the second connecting member 52 may be a bolt or a screw.

[0188] In some embodiments, each first box wall 13 and each rigid member connecting portion 42 may be connected via one or more second connecting members 52 .

[0189] Thus, the rigid member connecting portions 42 can be connected to the first box wall 13 respectively.

[0190] In some embodiments, as Figure 3 、 Figure 21 and Figure 22 As shown, the rigid member connecting portion 42 is built into the cover body 3, the rigid member connecting portion 42 is formed with a connecting hole, the cover body 3 is formed with a connecting avoidance hole 34, the battery device also includes a third connecting member 53, the third connecting member 53 at least partially passes through the connecting avoidance hole 34 and the connecting hole, connects the rigid member connecting portion 42 to the first box wall 13, and the third connecting member 53 contacts the side of the rigid member connecting portion 42 along the first direction X away from the battery cell assembly 2.

[0191] In some embodiments, as Figure 21 and Figure 22 As shown, a portion of the third connecting member 53 (e.g., the head of the bolt) is sunk into the connection avoidance hole 34, thereby being securely fastened to the rigid member connecting portion 42. In other words, when observing the connection avoidance hole 34 and the rigid member connecting portion 42 along the first direction X, the connection hole and a portion of the rigid member connecting portion 42 surrounding it can be observed through the connection avoidance hole 34.

[0192] In some embodiments, the third connecting member 53 can be a bolt fastener, which passes through the connection avoidance hole 34, the connection hole and part of the first box wall 13, and the head abuts against the rigid member connection portion 42 exposed in the connection avoidance hole 34.

[0193] In some embodiments, the first box wall 13 has a third mounting boss (not shown), and the third connecting member 53 connects the rigid member connecting portion 42 to the third mounting boss.

[0194] In some embodiments, the third mounting boss is formed by thickening a portion of the first box wall 13 , thereby improving the strength and rigidity of the first box wall 13 at the position where it is connected to the third connecting member 53 .

[0195] Optionally, the third connecting member 53 may be a bolt or a screw.

[0196] In some embodiments, each first box wall 13 and each rigid member connecting portion 42 may be connected via one or more third connecting members 53 .

[0197] The present application does not impose any specific restrictions on the specific shape and size of the connection avoidance hole 34, as long as the connection avoidance hole 34 can avoid the third connecting member 53, so that the third connecting member 53 contacts the side of the rigid member connecting portion 42 away from the battery cell assembly 2 along the first direction X.

[0198] The present application does not impose any specific restrictions on the specific shape and size of the connection hole, as long as the connection hole can avoid the third connection portion and the third connection flange can abut against the rigid component connection portion 42.

[0199] In a specific embodiment, the connecting hole and the connecting avoidance hole 34 are both circular holes, the connecting hole and the connecting avoidance hole 34 are concentrically arranged, and the diameter of the connecting hole is smaller than the diameter of the connecting avoidance hole 34 .

[0200] In a 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 portion perpendicular to the first direction X.

[0201] Thus, the rigid member connecting portions 42 can be connected to the first box wall 13. Furthermore, since the rigid member connecting portions 42 are internally mounted within the cover 3, the largest possible portion of the rigid member 4 can be positioned within the cover 3, thereby improving the corrosion resistance of the rigid member 4. Since the cover 3 is formed with the connection avoidance hole 34, the third connector 53 contacts the side of the rigid member connecting portion 42 facing away from the battery cell assembly 2 along the first direction X. This reduces the risk of insufficient fastening due to cover deformation. For example, if the cover is made of a resin material, this reduces the risk of loosening of the third connector and the rigid member connecting portion due to cover creep.

[0202] It is understandable that the third connecting member 53 may also be in contact with a side of the cover 3 that is away from the battery cell assembly 2 along the first direction X.

[0203] Next, the positional relationship between the rigid member 4 and the battery cell assembly 2 will be further described.

[0204] In some embodiments, as Figure 2 and 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. The first direction X, the second direction Y, and the third direction Z intersect with each other. Within the projection plane along the first direction X, the projection of each battery cell assembly 2 overlaps with the projection of the rigid member main body 41 of at least one rigid member 4.

[0205] In the projection plane projected along the first direction X, the projection of each battery cell assembly 2 may overlap with the projections of one, two, three or more rigid member main bodies 41 .

[0206] For example, the projection of each battery cell assembly 2 may have an overlapping portion with the projection of one rigid part main body 41; or, the projection of each battery cell assembly 2 may have an overlapping portion with the projection of two rigid part main bodies 41; or, the projection of some battery cell assemblies 2 among multiple battery cell assemblies may have an overlapping portion with the projection of one or two rigid part main bodies 41.

[0207] The specific area of the overlapping portion between the projection of each battery cell assembly 2 and the projection of the rigid member main body 41 in the projection plane along the first direction X is not specifically limited herein, and the area of the overlapping portion can be adjusted as needed.

[0208] In this way, the expansion force of the battery cell assembly 2 can be evenly borne by multiple rigid parts 4, reliably reducing the probability of the battery cell assembly 2 expanding due to charging and / or discharging or reducing the degree of expansion of the battery cell assembly 2 due to charging and / or discharging, thereby reducing the probability of deformation of the battery device or reducing the degree of deformation of the battery device.

[0209] It can be understood that, within the projection plane projected along the first direction X, the projection of the battery cell assembly 2 may not overlap with the projection of the rigid member main body 41 .

[0210] In some embodiments, within the projection plane projected along the first direction X, the projection of at least one rigid member main body 41 and the projections of two adjacent battery cell assemblies 2 along the third direction Z both have overlapping portions.

[0211] In some embodiments, within the projection plane projected along the first direction X, the projection of each rigid member main body 41 overlaps with the projections of two adjacent battery cell assemblies 2 along the third direction Z. Specifically, when the rigid member 4 and the electrode terminal 8 (also known as the terminal post) of the battery cell 21 are located on the same side along the first direction X, the projection of the rigid member main body 41 and the projection of the electrode terminal 8 may not overlap. 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 projection of the rigid member main body 41 and the projection of the pressure relief valve 9 may not overlap.

[0212] Therefore, at least part of the battery cells 21 are correspondingly subjected to the restraining force of the rigid part 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 expansion of the battery cell assembly 2 due to charging and / or discharging or reducing the degree of expansion of the battery cell assembly 2 due to charging and / or discharging, thereby further reducing the probability of deformation of the battery device or reducing the degree of deformation of the battery device.

[0213] 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, and the shoulders of all the battery cells 21 in the battery cell assembly 2 are further referred to as the shoulders of the battery cell assembly 2. The projection of a rigid part main body 41 can overlap with the shoulders of each of the two adjacent battery cell assemblies 2.

[0214] In some embodiments, as Figures 23 to 25 As shown, the cover body 3 is formed to have a thin-walled portion 35 and multiple local thickened portions, the multiple local thickened portions including a first local thickened portion 36 protruding toward a side close to the battery cell assembly 2 relative to the thin-walled portion 35, and the first local thickened portion 36 contacts the battery cell assembly 2.

[0215] It is understood that the structure described here can also be applied to Figure 2 、 Figure 3 Battery unit shown.

[0216] Optionally, the number of the first locally thickened portions 36 may be one, two, three or more.

[0217] Optionally, the plurality of first locally thickened portions 36 may be arranged along the second direction Y, and / or the plurality of first locally thickened portions 36 may be arranged along the third direction Z.

[0218] In a specific embodiment, Figure 23 、 Figure 24 and Figure 25 As shown, the first local thickened portion 36 extends along the second direction Y, and a plurality of first local thickened portions 36 are arranged along the third direction Z.

[0219] In some embodiments, the first locally thickened portion 36 extends along the second direction Y, and a length of the first locally thickened portion 36 along the second direction Y may be less than or substantially equal to a length of the opening 12 along the second direction Y.

[0220] In some embodiments, the first locally thickened portion 36 extends along the second direction Y, and a length of the first locally thickened portion 36 along the second direction Y may be greater than, substantially equal to, or less than a length of the battery cell assembly 2 along the second direction Y.

[0221] In some embodiments, along the first direction X, the first local thickened portion 36 is close to the surface of the battery cell assembly 2 (eg Figure 24 The lower surface shown in FIG3 is substantially flat, thereby facilitating reliable contact between the first local thickening portion 36 and the battery cell assembly 2. Of course, the first local thickening portion 36 is close to the surface of the battery cell assembly 2 (eg Figure 24 The lower surface shown in FIG4 may also be a curved surface with a slight curvature.

[0222] In some embodiments, the first locally thickened portion 36 abuts against a portion of the battery cell 21 in the battery cell assembly 2 where components such as the electrode terminal 8 or the pressure relief valve (not shown) are not provided.

[0223] Optionally, the first locally thickened portion 36 may be in contact with all the battery cells 21 in the same battery cell assembly 2 ; the first locally thickened portion 36 may be in contact with some of the battery cells 21 in the same battery cell assembly 2 .

[0224] Optionally, the first local thickened portion 36 may be bonded to the battery cell assembly 2 ; the first local thickened portion 36 may also only be in contact with the battery cell assembly 2 without being connected thereto.

[0225] Optionally, the number of the first locally thickened portions 36 may be the same as or different from the number of the rigid members 4 .

[0226] Optionally, at least one rigid component main body portion 41 is disposed in each first locally thickened portion 36 ; at least one rigid component main body portion 41 is disposed in some of the first locally thickened portions 36 .

[0227] The first locally thickened portion 36 can enhance the strength and rigidity of the cover 3, improving the cover 3's ability to suppress deformation. Furthermore, because the first locally thickened portion 36 contacts 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.

[0228] In some embodiments, as Figure 24 and Figure 25 As shown, multiple battery cell assemblies 2 are arranged along the third direction Z; the same first local thickening portion 36 contacts the shoulders of two battery cell assemblies 2 arranged adjacent to each other along the third direction Z, and the first direction X, the second direction Y and the third direction Z intersect each other.

[0229] The battery cell assembly 2 has a first surface close to the first local thickening portion 36 along the first direction X. The portion of the first surface close to 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 based on actual conditions.

[0230] 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 a third direction Z, and the same first local thickening portion 36 abuts against one end of the first battery cell assembly along the third direction Z close to the second battery cell assembly, and one end of the second battery cell assembly along the third direction Z close to the first battery cell assembly.

[0231] Thus, one first locally thickened portion 36 can position two battery cell assemblies 2 along the first direction X, simplifying the structure of the cover 3 and further simplifying the structure of the battery device.

[0232] In some embodiments, as Figures 11 to 13 As shown, in at least one first locally thickened portion 36 , the first cover portion 31 , the rigid component main body portion 41 and the second cover portion 32 are stacked along the thickness direction, and the thickness direction is consistent with the first direction X.

[0233] In some embodiments, in each of all the first locally thickened portions 36 , the first cover portion 31 , the rigid body portion 41 , and the second cover portion 32 are stacked in the thickness direction, that is, the rigid body portion 41 is located within the first locally thickened portion 36 .

[0234] Since the first cover body part, the rigid member main body part and the second cover body part are stacked in the thickness direction in at least one first local thickening part, the strength and rigidity of the first local thickening part of the cover can be enhanced, the strength and rigidity of the cover body can be further strengthened through the first local thickening part, and the ability of the cover body to resist deformation can be improved; and the first local thickening part can be reliably pressed on the battery cell.

[0235] In some embodiments, the first locally thickened portion 36 is bonded to the battery cell assembly 2 , and the bonding may be performed using an adhesive.

[0236] Optionally, the first local thickening portion 36 may be bonded to all the battery cells 21 in the battery cell assembly 2, or may be bonded to some of the battery cells 21 in the battery cell assembly 2. In a specific embodiment, the first local thickening portion 36 is bonded to all the battery cells 21 in the battery cell assembly 2.

[0237] Because the first locally thickened 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 rigidity of the battery assembly along the third direction Z and reducing the probability or degree of deformation of the battery assembly along the first direction X. Furthermore, for example, if the cover 3 serves as the top cover of the battery assembly, the first locally thickened portion 36 is bonded to the battery cell assembly 2. The first locally thickened portion 36 can exert a tensile force along the first direction on the battery cell assembly 2, reducing the pressure exerted by the battery cell assembly 2 on the lower support components of the housing, thereby improving the overall structural strength and rigidity of the housing. This facilitates design options that reduce the strength of the housing, such as by thinning the housing or reducing reinforcement beams, to achieve cost and weight reduction. Furthermore, because the first locally thickened portion is bonded to the battery cell assembly, the relative positions of the battery cell assemblies in the third direction Z are fixed.

[0238] In some embodiments, as Figure 4 、 Figure 24 and Figure 25 As shown, a plurality of battery cell assemblies 2 are arranged along a third direction Z, the battery cell assembly 2 includes at least one battery cell 21, and the battery cell 21 has a pressure relief valve 9 arranged toward the cover body 3 (only the pressure relief valve of one battery cell is shown, and the illustration of other pressure relief valves is omitted); a plurality of first local thickening portions 36 are arranged along the third direction Z, and along the first direction X, there is a gap 6 between the pressure relief valve 9 and the thin-walled portion 35, and, 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 local thickening portions 36.

[0239] In some embodiments, multiple first local thickening portions 36 are arranged along the third direction Z, and the first local thickening portions 36 extend along the second direction Y. Two first local thickening portions 36 are in contact with the two shoulders of the same battery cell assembly 2 along the second direction Y, respectively. The two first local thickening portions 36, the thin-walled portion 35, and the battery cell assembly 2 that is in contact with the two first local thickening portions 36 form a pressure relief channel. For example, when the pressure relief valve 9 is opened in the event of thermal runaway of the battery cell 21, the gas released can flow in a direction through the pressure relief channel.

[0240] In some embodiments, as Figure 24 、 Figure 26 and Figure 27 As shown, the box body 1 is provided with a pressure relief outlet piece 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 piece 133 through the pressure relief channel and then flow out of the box body 1 .

[0241] In some embodiments, the pressure relief outlet 133 is provided on the first box wall 13. Optionally, the pressure relief outlet 133 may include a valve mechanism that can automatically open under a certain air pressure.

[0242] In some embodiments, within the same projection plane projected along the second direction Y, the projection of the pressure relief outlet member 133 is located between the projections of adjacent first locally thickened portions 36 .

[0243] 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 the adjacent first local thickened portions 36 in the same projection plane projected along the first direction X, the first local thickened portions 36 and the thin-walled portions 35 and the battery cell assembly 2 adjacent along the third direction Z can define a pressure relief channel, and the gas released when the pressure relief valve 9 is flushed can flow in a direction along the pressure relief channel, reducing the probability that the gas released when the pressure relief valve is flushed will cause damage to the battery device.

[0244] In some embodiments, as Figure 4 、 Figure 24 and Figure 25As shown, the box body 1 includes a second box body wall 14 opposite to the cover body 3 along the first direction X, and the second box body wall 14 is bonded to the battery cell assembly.

[0245] Optionally, the second box wall 14 may be bonded to all the battery cells 21 in the battery cell assembly 2 , or the second box wall 14 may be bonded to some of the battery cells 21 in the battery cell assembly 2 .

[0246] In some embodiments, the second box wall 14 is bonded to the battery cell assembly 2 , and the first locally thickened portion 36 is bonded to the battery cell assembly 2 .

[0247] In some embodiments, the second housing wall 14 is a heat exchange element, and optionally, a heat exchange medium flow channel is provided inside the heat exchange element. Optionally, the heat exchange medium manifold (inlet, outlet) of the heat exchange medium flow channel can be located outside the housing 1.

[0248] Since the second box wall is bonded to the battery cell assembly, multiple groups of battery cell assemblies are formed into a whole through the second box wall, thereby improving the rigidity of the battery device along the third direction and reducing the probability of deformation of the battery device along the first direction or reducing the degree of deformation of the battery device along the first direction.

[0249] In some embodiments, the box body 1 includes a plurality of box body walls, which define a receiving cavity 11 , and the cover body 3 closes the receiving cavity 11 , and the plurality of box body walls are separately provided.

[0250] Since the box wall is arranged separately, the assembly flexibility of the box wall and the battery cell assembly 2 can be improved. Moreover, a part of the box wall can be assembled first, and then the battery cell assembly 2 can be assembled into the unfinished box 1, and then the box 1 can be fully assembled, thereby saving the gap left by the smooth assembly of the battery cell assembly 2 into the box 1, reducing the size of the box 1, and then reducing the size of the battery device, which is conducive to the miniaturization of the battery device.

[0251] In some embodiments, at least a portion of the battery cell assembly 2 is in contact with the box wall, and the accommodating cavity 11 is sealed relative to the exterior of the box 1 .

[0252] 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 contacts the box wall.

[0253] In some embodiments, the battery module, the box body 1 and the cover body 3 form a battery pack.

[0254] Since the battery cell assembly 2 is in contact with the wall of the box, the size of the box 1 can be reduced, and thus the size of the battery device can be reduced, which is conducive to miniaturization of the battery device.

[0255] A second aspect of the present application provides an electrical device, which includes the battery device provided in the first aspect of the present application.

[0256] Since the electrical device includes the battery device provided above, the battery device can take into account both suppressing box deformation and reducing manufacturing costs, thereby correspondingly improving the reliability of the electrical device and reducing the production cost and maintenance cost of the electrical device.

[0257] A third aspect of the present application provides an energy storage device, which includes the battery device provided in the first aspect of the present application.

[0258] Since the energy storage device includes the battery device provided above, the battery device can take into account both suppressing box deformation and reducing manufacturing costs, thereby correspondingly improving the reliability of the energy storage device and reducing the production cost and maintenance cost of the energy storage device.

[0259] Some specific embodiments are described below.

[0260] In a specific embodiment, the top cover of a battery case is primarily composed of a non-metallic cover body 3 and an inlaid metallic rigid member 4. The cover body 3 is typically made of a composite material or plastic, while the rigid member 4 is typically made of high-strength spring steel or carbon steel. During the production process of the top cover, the rigid member 4 is embedded into the cover body 3 through insert molding or integral injection molding. The length of the rigid member 4 aligns with the length of the battery cell assemblies 2 within the battery pack. Multiple rigid members 4 may be embedded within a single cover body 3, spaced apart according to the installation position of the battery cell assemblies 2 within the battery pack. The material selection, dimensions, and quantity of the rigid members 4 are determined by the dimensions of the cover body 3 and the expansion force of the battery cell assemblies 2. Generally, one or more rigid members 4 are designed for each battery cell assembly 2. For battery cell assemblies 2 with relatively low expansion force, one rigid member 4 may be designed to correspond to multiple groups of battery cell assemblies 2. The selected material and dimensions of the rigid member 4 should result in a tensile strength greater than the tensile force distributed to the rigid member 4 by the expansion force of the battery cell assemblies 2. Both ends of the rigid member 4 extend beyond the cover 3. Mounting holes are designed on both ends of the rigid member 4 (the rigid member connecting portions 42). After the cover 3 is mounted on the case 1, the cover 3 is connected to the case 1 on all sides to seal the battery pack. The rigid member connecting portions 42 are also connected to the case 1.

[0261] The portion of the rigid member connecting portion 42 extending out from the edge of the cover 3 can be designed as follows: Figure 17 and Figure 18 In the bent state shown, the rigid member 4 is fixed to the box body 1 by side mounting bolts; both ends of the rigid member 4 can also be designed to be straight, such as Figure 19 and Figure 20As shown, the rigid member 4 is fixed to the box body 1 by vertically installing fixing bolts on the top of the battery pack. The portion of the rigid member 4 extending out of the cover body 3 (rigid member connecting portion 42) needs to be treated with anti-corrosion to meet the corrosion protection requirements of the product during long-term use.

[0262] The rigid member connecting portion 42 may not extend out of the edge of the cover 3, such as Figure 21 and Figure 22 As shown, at this time, the mounting hole of the rigid part 4 (the connection hole and the connection avoidance hole 34) needs to pass through the cover body 3 and the rigid part connecting portion 42. The connection avoidance hole 34 and the connection hole are designed to be concentric. Generally, the connection avoidance hole 34 needs to be larger than the connection hole. Thus, the bolt can press the rigid part connecting portion 42 instead of pressing on the non-metallic material of the cover body 3. Pressing the bolt on the non-metallic material of the cover body 3 will cause the cover body 3 material to be crushed and damaged, and the non-metallic material will also produce creep deformation, resulting in the attenuation of the torque of the mounting bolt, causing the bolt to loosen.

[0263] The battery pack using this solution does not need to install the anti-expansion force rigid member 4 above the battery cell assembly 2 inside the battery pack, nor does it need to install the rigid member 4 for pressing the cover 3 outside the cover 3. Figure 2 and Figure 3 As shown, the first box wall 13 is designed to fit snugly against the battery cell assembly 2 within the box 1. This allows the first box wall 13, connected to the rigid member 4, to absorb the expansion force of the battery cell assembly 2. Furthermore, the rigid member 4 is connected to the cover 3, transforming the battery box into a rectangular block with metal parts connecting all six sides. This significantly improves the overall structural strength of the battery pack and reduces the likelihood of deformation or cracking of the box 1 during transportation.

[0264] In another specific embodiment, a first local 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 local thickening portion 36 facing the battery cell assembly 2 is flat. The height of the first local thickening portion 36 along the first direction X is consistent with 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, so that after the cover 3 is installed on the box body 1, the inner surface of the first local 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 local 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.

[0265] The outer surface of the cover 3 can be a flat surface, with internal ribs (first locally thickened portion 36) formed by local thickening. Alternatively, the first locally thickened portion 36 can be formed by a local depression in the cover 3. The cover 3 can be formed using a plastic sheet through a vacuum forming process, a plastic injection molding process, a composite material through a molding process, or a metal sheet through a stamping process. The cover 3 can be a flat plate or other structural form, such as an inverted pot.

[0266] like Figure 27 As shown, taking a battery pack in which there are four battery cell assemblies 2 and each battery cell assembly 2 includes thirteen battery cells 21 as an example, the battery cells 21 in each battery cell assembly 2 are arranged along the second direction Y, the four battery cell assemblies 2 are arranged side by side along the third direction Z, and the explosion-proof valve is located on the first box wall 13.

[0267] After the cover 3 is installed on the box body 1, the edge of the cover 3 is connected and fixed to the outer edge of the box body 1 to achieve the sealing of the battery pack; the internal rib (first local thickening portion 36) raised on the inner surface of the cover 3 is located roughly in the middle of the two rows of battery cell assemblies 2, and the first local thickening portion 36 is connected to the upper surface of the battery cell 21 (see Figure 24 and Figure 25 ) are glued and bonded on the contact surface, each first local thickening portion 36 is simultaneously bonded to the battery cells 21 of two rows of battery cell assemblies 2, and the bottoms of the battery cell assemblies 2 are glued to the box body 1. At this time, the four rows of battery cell assemblies 2 are glued to the first local thickening portions 36 at the top and the bottoms of the battery cell assemblies 2 are glued to the box body 1 to form an integral battery module. The battery module itself has a certain rigidity, which can reduce the probability of bending and sinking in the middle of the battery pack.

[0268] In the length direction of the battery cell assembly 2, each first local thickening 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 box wall 13, rigid part 4 and other anti-expansion force structural parts.

[0269] by Figure 24 For example, for the leftmost or rightmost battery cell assembly 2, the top of the battery cell assembly 2 and the box wall closest to the battery cell assembly 2 along the third direction Z (for example, Figure 24The left side wall (as shown), thin-walled portion 35, and first locally thickened portion 36 form an exhaust passage. For the middle battery cell assembly 2, an exhaust passage is formed by the thin-walled portion 35, two first locally thickened portions 36, and the top surface of the battery cell assembly 2. Along the third direction Z, the explosion-proof valve of the battery cell 21 is located in the middle of the exhaust passage, and the pressure relief outlet 133 is located on the first casing wall 13. When a single-row battery cell assembly 2 experiences thermal runaway, the thermal runaway gas flows through the top exhaust passage to the pressure relief outlet 133, and is rapidly discharged to the outside of the casing 1 through the pressure relief outlet 133. The thermal runaway gas does not enter the area where other battery cell assemblies 2 are located.

[0270] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the present application.

Claims

1. A battery device, characterized in that: include: a box body defining a receiving cavity, wherein the box body has an opening opening toward a first direction; a cover body connected to the box body and closing the opening along a first direction; At least one battery cell assembly, accommodated in the accommodation cavity; At least one rigid part, each of the rigid parts includes a rigid part main body and a rigid part connecting part, the rigid part connecting part is connected to both ends of the rigid part main body, the rigid part main body is embedded in the cover body, and the rigid part connecting part is at least partially exposed from the cover body and is respectively connected to the box body.

2. The battery device according to claim 1, wherein: The cover body comprises a first cover body portion and a second cover body portion connected along the first direction, and a cavity is formed between the first cover body portion and the second cover body portion; The rigid component main body is located in the cavity, and the first cover portion and the second cover portion cover a circumference of the rigid component main body.

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

4. The battery device according to claim 1, wherein: 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 At least one of the battery cell assemblies includes a plurality of battery cells arranged along the second direction; The box body includes first box body walls arranged opposite to each other along a second direction, The rigid component connection parts are respectively connected to the first box wall, and the second direction intersects with the first direction.

7. The battery device according to claim 6, characterized in that The battery cell includes a housing, wherein the housing defines a receiving space through connected housing walls. The large-surface housing wall among the housing walls is perpendicular to the second direction, wherein the large-surface housing wall is the housing wall with the largest area among the housing walls.

8. The battery device according to claim 6, characterized in that The rigid member connecting portion is bent relative to the rigid member main body portion, Along the second direction, the rigid member connecting portion is located on a side of the first box wall away from the battery cell assembly. The battery device further includes a first connecting member connecting the rigid member connecting portion and the first box wall.

9. The battery device according to claim 6, characterized in that Along the first direction, the rigid member connecting portion is located on a side of the first box wall close to the cover. The battery device further includes a second connecting member connecting the rigid member connecting portion and the first box wall.

10. The battery device according to claim 6, wherein: The rigid member connecting portion is built into the cover body, the rigid member connecting portion is formed with a connecting hole, and the cover body is formed with a connecting avoidance hole. The battery device further includes a third connecting member, which is provided through the connection avoidance hole and the connection hole, and connects the rigid member connecting portion and the first box wall. The third connecting member contacts a side of the rigid member connecting portion that is away from the battery cell assembly along the first direction.

11. The battery device according to any one of claims 1 to 5, characterized in that The plurality of battery cell assemblies are arranged along a third direction, the plurality of rigid members are arranged along the third direction, and the first direction, the second direction and the third direction intersect in pairs; In a projection plane projected along the first direction, a projection of each of the battery cell assemblies and a projection of the rigid member main body of at least one of the rigid members have an overlapping portion.

12. The battery device according to claim 11, wherein: In a projection plane projected along the first direction, a projection of at least one main body portion of the rigid component and projections of two adjacent battery cell assemblies along the third direction both have overlapping portions.

13. The battery device according to claim 2, wherein: The cover is formed to have a thin-walled portion and a plurality of locally thickened portions, wherein the plurality of locally thickened portions include a first locally thickened portion protruding relative to the thin-walled portion toward a side close to the battery cell assembly, and the first locally thickened portion contacts the battery cell assembly.

14. The battery device according to claim 13, wherein: The plurality of battery cell assemblies are arranged along a third direction; The same first locally thickened portion contacts shoulders of two battery cell assemblies adjacently arranged along a third direction, and the first direction, the second direction, and the third direction intersect with each other.

15. The battery device according to claim 13, wherein: In at least one of the first locally thickened portions, the first cover portion, the rigid component main body portion, and the second cover portion are stacked along a thickness direction, and the thickness direction is consistent with the first direction.

16. The battery device according to claim 13, wherein: The first locally thickened portion is bonded to the battery cell assembly.

17. The battery device according to claim 13, wherein: A plurality of battery cell assemblies are arranged along a third direction, wherein the battery cell assembly includes at least one battery cell, and the battery cell has a pressure relief valve disposed toward the cover body; A plurality of the first locally thickened portions are arranged along the third direction, Along the first direction, a gap exists between the pressure relief valve and the thin-walled portion, and within the same projection plane projected along the first direction, the projection of the pressure relief valve is located between projections of adjacent first locally thickened portions.

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

19. An electrical device, characterized in that: The electrical device comprises the battery device according to any one of claims 1 to 18.

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

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