Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell and an electrode assembly, the shell has a length direction, a width direction and a height direction which are perpendicular to one another, the shell has two opposite first side surfaces in the width direction, and has two opposite second side surfaces in the length direction, the electrode assembly is arranged in an inner cavity of the shell. The two ends of the electrode assembly in the length direction are provided with bent faces. The shell further comprises an abutting face connected with the first side face and the second side face. According to the battery monomer provided by the invention, the propping surfaces are arranged at the corners of the shell, so that the load at the corners of the shell is dispersed, the stress concentration is avoided, the structural strength and deformation resistance of the shell are improved, and the performance and safety of the battery monomer are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and more particularly relates to a battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In a square shell battery monomer, a square shell is often used to package an internal electrode assembly. However, when subjected to external load or internal expansion stress, stress concentration phenomenon is prone to occur at the corner of the shell, resulting in excessive local stress and affecting the structural strength of the shell. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the embodiments of the application is to provide a battery monomer, a battery device and a power utilization device to improve the technical problem of stress concentration at the corner of the shell of the battery monomer in the prior art.

[0005] In a first aspect, the application provides a battery monomer, comprising a shell and an electrode assembly, the shell having a length direction, a width direction and a height direction perpendicular to each other, the shell having two opposite first side surfaces in the width direction and two opposite second side surfaces in the length direction; the electrode assembly is arranged in the inner cavity of the shell, and the two ends of the electrode assembly along the length direction have curved surfaces; wherein the shell further comprises a butt surface connecting the first side surface and the second side surface.

[0006] In the technical solution of the embodiments of the application, the butt surface is arranged at the connecting area of the first side surface and the second side surface, and the butt surface is arranged towards the curved surface of the electrode assembly, forming a support structure with high strength, which can effectively disperse the load at the corner of the shell, avoid stress concentration, effectively reduce the stress value at the corner, improve the structural strength and anti-deformation ability of the shell, and enhance the overall structural rigidity and load bearing capacity, thereby better inhibiting the deformation of the electrode assembly and improving the performance and safety of the battery monomer.

[0007] In some embodiments, the butt surface is further used to butt against the curved surface to inhibit the expansion deformation of the electrode assembly at the curved surface.

[0008] Through the above technical solution, the butt surface forms a physical contact interface with the curved surface in the initial state of assembly, and a pre-tightening force is applied thereto. When the electrode assembly expands in volume during charging and discharging, the expansion deformation of the electrode assembly at the curved surface can be effectively inhibited, the liquid climbing defect of the electrode liquid can be reduced, and the cycle life and safety of the battery can be improved.

[0009] In some embodiments, the abutting surface comprises a first plane, the first plane being connected to the first side surface.

[0010] Through the above technical solution, the first plane can exert uniform support force on the curved surface of the electrode assembly, improve the electrolyte infiltration effect, thereby reducing the risk of lithium precipitation, and avoiding damage to the electrode assembly.

[0011] In some embodiments, the first plane is inclined to the first side surface.

[0012] Through the above technical solution, the inclined first plane can form a more conformal support on the curved surface of the electrode assembly, maintain stable interface pressure, suppress local swelling, improve the reliability of the battery cell while reducing stress concentration of the electrode assembly at the curved surface.

[0013] In some embodiments, the first plane and the first side surface form an angle α, where 120°≤α≤150°.

[0014] Through the above technical solution, setting the angle range can make the first plane and the curved surface of the electrode assembly realize good contact, which can effectively suppress swelling deformation, ensure structural strength, and also consider processing convenience.

[0015] In some embodiments, the abutting surface comprises a second plane, the second plane being connected to the second side surface.

[0016] Through the above technical solution, the second plane can exert uniform support force on the curved surface of the electrode assembly, improve the electrolyte infiltration effect, thereby reducing the risk of lithium precipitation, and avoiding damage to the electrode assembly.

[0017] In some embodiments, the second plane is inclined to the second side surface.

[0018] Through the above technical solution, the inclined second plane can better adapt to the shape of the curved surface of the electrode assembly, uniformly abut the curved surface of the electrode assembly, improve the support effect, promote uniform electrolyte infiltration of the electrode assembly, reduce the risk of lithium precipitation, and reduce stress concentration of the electrode assembly at the curved surface.

[0019] In some embodiments, the second plane and the second side surface form an angle β, where 120°≤β≤150°.

[0020] Through the above technical solution, setting the angle range can make the second plane and the curved surface of the electrode assembly realize good contact, which can effectively suppress swelling deformation, ensure structural strength, and also consider processing convenience.

[0021] In some embodiments, the abutting surface comprises a plurality of sequentially connected planes, adjacent two planes are arranged at an obtuse angle, and the planes at both ends are connected to the first side surface and the second side surface, respectively.

[0022] By the above technical solution, the abutting surface can form multi-section contact support with the curved surface of the electrode assembly, better adapt to the edge profile of the curved surface, increase the contact area, effectively inhibit the gap expansion at the corner of the electrode assembly, improve the uniformity of the electrode liquid distribution, reduce the risk of lithium precipitation, and ensure a certain structural rigidity.

[0023] In some embodiments, the abutting surface is arranged in a plane.

[0024] By the above technical solution, the abutting surface is arranged as a whole plane, which is easy to process and form, can provide sufficient constraint to inhibit the expansion of the electrode assembly, and can effectively disperse the stress generated at the corner of the curved surface when the electrode assembly expands, thereby significantly improving the structural carrying capacity.

[0025] In some embodiments, the first side surface and the second side surface are transitionally connected by the abutting surface.

[0026] By the above technical solution, the side wall of the shell forms an integrated continuous shell, which not only improves the overall structural strength and rigidity, but also reduces the stress concentration at the corner of the electrode assembly and effectively inhibits local expansion.

[0027] In some embodiments, a limiting structure is arranged in the shell at the connection region between the first side surface and the second side surface, and the surface of the limiting structure facing the electrode assembly constitutes the abutting surface.

[0028] By the above technical solution, the limiting structure can enhance the expandability and adaptability of the shell, effectively inhibit the expansion and deformation of the electrode assembly, enhance the structural strength of the shell, and improve the overall stability of the battery monomer.

[0029] In some embodiments, the limiting structure includes a plurality of ribs arranged at intervals in the height direction.

[0030] By the above technical solution, the ribs can effectively enhance the structural strength of the shell, provide segmented support and limitation for the curved surface of the electrode assembly, inhibit local expansion, and disperse the stress generated by the expansion of the electrode assembly.

[0031] In some embodiments, the shell includes a shell body and an end cover, the shell body has a first side surface, a second side surface and an abutting surface, the shell body is provided with an opening, the electrode assembly is arranged in the shell body, the end cover is connected to the shell body and seals the opening, and the outer wall of the end cover is arranged in the opening of the shell body.

[0032] By the above technical solution, the outer wall of the end cover is adapted to the inner wall of the opening of the shell body, which improves the sealing performance, structural stability and safety of the battery monomer, and the design of the abutting surface does not affect the original mechanical properties of the end cover.

[0033] In a second aspect, the application provides a battery device, comprising a box body and a battery cell as described in the above embodiments, wherein the battery cell is installed in the box body.

[0034] In some embodiments, the battery device comprises a battery cell assembly, wherein the battery cell assembly comprises a plurality of battery cells arranged along a first direction; and an installation space is formed between the abutting surfaces of two battery cells adjacent along the first direction.

[0035] Through the above technical solution, the installation space can be used as a layout space for other structures of the battery device, which not only leaves more installation space for other structures, but also improves the energy density of the battery device, while effectively inhibiting the expansion and deformation of the electrode assembly.

[0036] In some embodiments, the battery device comprises a heat management structure, wherein the heat management structure comprises a heat management part configured to fit in the installation space.

[0037] Through the above technical solution, the heat management structure can be installed in the installation space, and the structural gap naturally generated by the arrangement of the battery cells is fully utilized, thereby achieving efficient integration of the heat management structure.

[0038] In some embodiments, the battery device comprises a detector, wherein the detector is disposed in the installation space.

[0039] Through the above technical solution, the detector can be installed in the installation space without the need for additional installation structures or occupying other space, thereby improving the space utilization of the battery device.

[0040] In a third aspect, the application provides a power consumption device, comprising a battery cell according to the above embodiments, and a battery device according to the above embodiments.

[0041] The above description is only a summary of the technical solutions of the application, in order to more clearly understand the technical means of the application, the specific embodiments of the application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the application more obvious and easy to understand, the following will describe the specific embodiments of the application. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0043] Figure 1 The structural schematic diagram of the vehicle of some embodiments of the application;

[0044] Figure 2Exploded view of a battery device according to some embodiments of the application;

[0045] Figure 3 Exploded view of a battery device according to some other embodiments of the application;

[0046] Figure 4 Exploded view of a battery cell according to some embodiments of the application;

[0047] Figure 5 Schematic view of an electrode assembly according to some embodiments of the application;

[0048] Figure 6 Schematic view of a battery cell according to some other embodiments of the application Figure 1 ;

[0049] Figure 7 Schematic view of an electrode assembly according to some other embodiments of the application;

[0050] Figure 8 Schematic view of a battery cell according to some other embodiments of the application Figure 2 ;

[0051] Figure 9 Exploded view of a housing according to some other embodiments of the application;

[0052] Figure 10 Schematic view of a housing according to some other embodiments of the application;

[0053] Figure 11 Front view of a housing according to some other embodiments of the application;

[0054] Figure 12 Schematic view of an arrangement of battery cells according to some other embodiments of the application;

[0055] Figure 13 Schematic view of a stress analysis simulation for a conventional square can Figure 1 ;

[0056] Figure 14 Schematic view of a stress analysis simulation for a housing according to some other embodiments of the application Figure 1 ;

[0057] Figure 15 Schematic view of a stress analysis simulation for a conventional square can Figure 2 ;

[0058] Figure 16 Schematic view of a stress analysis simulation for a housing according to some other embodiments of the application Figure 2 ;

[0059] Figure 17 Schematic view of a stress analysis simulation for a conventional square canFigure 3 ;

[0060] Figure 18 Stress analysis simulation diagram of the shell of another embodiment of the present application.

[0061] In the drawings:

[0062] 11, vehicle; 111, controller; 112, motor.

[0063] 200, battery device; 20, box body; 21, first part; 22, second part; 23, top cover; 24, frame; 25, bottom plate; 201, mounting space; 202, thermal management structure.

[0064] 300, battery cell; 30, shell; 31, casing; 311, first side; 312, second side; 313, abutting surface; 314, opening; 32, end cover; 321, electrode terminal; 33, electrode assembly; 33A, curved surface; 331, positive electrode; 332, negative electrode; 333, separator; 334, tab; 3341, positive tab; 3342, negative tab; 34, pressure relief mechanism; 400, square shell.

[0065] X, length direction; Y, width direction; Z, height direction. DETAILED DESCRIPTION

[0066] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising" and "having," and any variations thereof, as used in the specification and claims and the aforementioned drawings, are intended to cover not exclusive inclusions.

[0068] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0069] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the other embodiments, alternative embodiments, or claims. It is explicitly contemplated that embodiments described herein can be combined with each other in any suitable manner.

[0070] All embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions, unless otherwise specified.

[0071] All technical features and optional technical features of the present application can be combined with each other to form new technical solutions, unless otherwise specified.

[0072] In the description of the embodiments of the present application, the term“and / or” is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character“ / ” herein generally represents that the front and rear associated objects are in an“or” relationship.

[0073] In the description of the embodiments of the present application, the term“a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces). The meaning of“several” is one or more, unless otherwise explicitly specified.

[0074] In the description of the embodiments of the present application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0075] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0076] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or indirectly on another element. When an element is referred to as "connected to" another element, it can be directly connected to another element or indirectly connected to another element.

[0077] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the technical term "adjacent" means close in position. For example, A1, A2 and B three components, the distance between A1 and B is greater than the distance between A2 and B, then A2 is closer to B than A1, that is, A2 is adjacent to B, and B is also adjacent to A2. For example, when there are multiple C components, the multiple C components are C1, C2……CN respectively, and when one of the C components, such as C2, is closer to the B component than the other C components, then B is adjacent to C2, and C2 is also adjacent to B.

[0078] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy-saving and environment-friendly advantages. For electric vehicles, battery technology is an important factor for their development.

[0079] The square shell is often used to package the internal electrode assembly in the square shell battery monomer, but when subjected to external load or internal expansion stress, stress concentration phenomenon is easy to occur at the corner of the shell, which leads to excessive local stress and affects the structural strength of the shell.

[0080] Based on the above consideration, in order to improve the technical problem that the stress concentration is easy to occur at the corner of the shell of the battery monomer in the prior art, the embodiments of the present application provide a battery monomer. By arranging the abutting surface at the connecting area of the first side surface and the second side surface, the abutting surface is arranged towards the curved surface of the electrode assembly, a support structure with high strength is formed, which can effectively disperse the load at the corner of the shell, avoid stress concentration, effectively reduce the stress value at the corner, improve the shell structure strength and anti-deformation ability, and enhance the overall structure rigidity and carrying capacity, so as to better inhibit the deformation of the electrode assembly and improve the performance and safety of the battery monomer.

[0081] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0082] The battery cell 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-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0083] The battery device disclosed in the embodiments of the present application can be used in a power consumption device using a battery as a power source. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, and a space shuttle, etc.

[0084] The following embodiments are described by taking a power consumption device in an embodiment of the present application as a vehicle for example for convenience of description.

[0085] Please refer to Figure 1 The vehicle 11 can be a fuel car, a gas car, or a new energy car, and the new energy car can be a pure electric car, a hybrid car, or a range extended car, etc. The vehicle 11 is internally provided with a battery device 200, which can be arranged at the bottom, head or tail of the vehicle 11. The battery device 200 can be used for power supply of the vehicle 11, for example, the battery device 200 can be used as an operating power source of the vehicle 11. The vehicle 11 can also include a controller 111 and a motor 112, and the controller 111 is used to control the battery device 200 to supply power to the motor 112, for example, for the working power demand of the vehicle 11 during starting, navigation and driving.

[0086] In some embodiments of the present application, the battery device 200 can not only be used as an operating power source of the vehicle 11, but also be used as a driving power source of the vehicle 11, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 11.

[0087] Please refer to Figures 2 to 5 The embodiments of the present application provide a battery device 200 (Battery Apparatus). The battery device 200 (Battery Apparatus) can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) can include a plurality of battery cells 300 connected in series, parallel or mixed connection through a busbar component.

[0088] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 300.

[0089] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells 300 into one independent module. As an example, the battery module can be formed by bundling a plurality of battery cells 300 with a cable tie.

[0090] In some embodiments, the battery device 200 can be a battery pack, which includes a case 20 and one or more battery cell assemblies, which are accommodated in the case 20.

[0091] As an example, the battery cell assembly can be a battery module, which can be accommodated in the case 20 by fixing the battery module in the case 20.

[0092] As an example, the battery cell assembly can also be accommodated in the case 20 by directly fixing a plurality of battery cells 300 in the case 20.

[0093] As an example, the case 20 can include a first case and a second case. The first case and the second case are buckled so that the inside of the case forms a closed space to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first case can be a top cover 23 or a bottom plate 25.

[0094] As an example, the case 20 can include a top cover 23, a frame 24, and a bottom plate 25. The top cover 23 and the bottom plate 25 are respectively connected with the frame 24, so that the inside of the case 20 forms a closed space to accommodate the battery cell assembly.

[0095] In some embodiments, the case 20 can be part of the chassis structure of the vehicle 11. For example, part of the case 20 can be at least part of the floor of the vehicle 11, or part of the case 20 can be at least part of the cross beam and the longitudinal beam of the vehicle 11.

[0096] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells 300, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles 11, ships, and spacecraft, such as aircraft, rockets, and space shuttles.

[0097] The battery cell 300 generally includes an electrode assembly 33. The electrode assembly 33 includes a positive electrode 331, a negative electrode 332, and a separator 333 disposed between the negative electrode 332 and the positive electrode 331. During charging and discharging of the battery cell 300, active ions (e.g., lithium ions) are intercalated and deintercalated between the positive electrode 331 and the negative electrode 332. The separator 333, which is disposed between the positive electrode 331 and the negative electrode 332, can prevent the positive and negative electrodes from shorting while allowing the active ions to pass through.

[0098] The electrode assembly 33 can be in a jelly-roll structure or a jelly-roll-laminated hybrid structure.

[0099] In some embodiments, the electrode assembly 33 is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0100] In some embodiments, the electrode assembly 33 can have a cylindrical shape, a flat shape, or a polygonal shape.

[0101] In some embodiments, the electrode assembly 33 is provided with a tab 334, which can conduct current out of the electrode assembly 33. The tab 334 includes a positive tab 3341 and a negative tab 3342.

[0102] In some embodiments, the battery cell 300 can include a housing 30. The housing 30 can be a steel can, an aluminum can, a plastic can (e.g., a polypropylene can), a composite metal can (e.g., a copper-aluminum composite can 30), or an aluminum-plastic film, among others. In some embodiments, the housing 30 can be a sealed structure or a non-sealed structure. As an example, when the housing 30 is a non-sealed structure, the housing 30 protects the electrode assembly 33, and the housing 30 and the electrode assembly 33 further include a sealing bag for encapsulating the electrode assembly 33 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing 30 is a sealed structure, the housing 30 encapsulates the electrode assembly 33 and the electrolyte, among others.

[0103] As an example, the battery cell 300 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of another shape, including a square can battery cell 300, a blade battery cell, a polygonal battery cell (e.g., a hexagonal battery cell), among others.

[0104] In some embodiments, the housing 30 includes an end cap 32 and a shell 31, and the shell 31 is provided with an opening 314, and the end cap 32 is provided on the opening 314. The shell 31 can be provided with one or more openings 314. The end cap 32 can also be provided with one or more openings.

[0105] In some embodiments, at least one electrode terminal 321 is provided on the shell 30, and the electrode terminal 321 is electrically connected with the tab 334. The electrode terminal 321 can be directly connected with the tab 334, or indirectly connected with the tab 334 through a current collecting member. The electrode terminal 321 can be provided on the end cover 32, or provided on the shell 31.

[0106] In some embodiments, a pressure relief mechanism 34 is provided on the shell 30. The pressure relief mechanism 34 is used to discharge the internal gas of the battery cell 300.

[0107] As an example, the pressure relief mechanism 34 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 300 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 300 reaches the predetermined threshold, the pressure relief mechanism 34 performs an action or a weak structure provided in the pressure relief mechanism 34 is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold value is designed differently according to different design requirements. The threshold value can depend on the material of one or more of the positive plate, the negative plate, the electrolyte, and the separator 333 in the battery cell 300.

[0108] As an example, the pressure relief mechanism 34 can be integrally formed with the shell 30.

[0109] As an example, the pressure relief mechanism 34 can also be provided separately from the shell 30 and connected with the shell 30.

[0110] The "actuation" mentioned in the present application refers to the pressure relief mechanism 34 generating an action or being activated to a certain state, so that the internal pressure and temperature of the battery cell 300 can be released. The action generated by the pressure relief mechanism 34 can include but is not limited to: a component in the pressure relief mechanism 34 moving to form an exhaust passage, at least a part of the pressure relief mechanism 34 breaking, shattering, being torn or opening, etc. When the pressure relief mechanism 34 is actuated, the high-temperature and high-pressure substances inside the battery cell 300 will be discharged outward from the actuated part as exhaust. In this way, the battery cell 300 can be relieved of pressure and temperature in a controllable manner, thereby avoiding potential more serious accidents.

[0111] In some embodiments, when the shell 30 is a non-sealed structure, the pressure relief mechanism 34 can be provided as a through hole for discharging the gas inside the battery cell 300.

[0112] The exhaust mentioned in the present application from the battery cell 300 includes but is not limited to: electrolyte, dissolved or split positive and negative plates, fragments of the separator 333, high-temperature and high-pressure gas generated by reaction, flame, etc.

[0113] Please refer to Figure 2The battery device 200 includes a case 20 and battery cells 300 housed in the case 20. The case 20 is configured to provide a housing space for the battery cells 300, and can have various configurations. In some embodiments, the case 20 can include a first portion 21 and a second portion 22, which are coupled to each other to define a housing space for the battery cells 300. The second portion 22 can be a hollow structure with an open end, and the first portion 21 can be a plate-shaped structure that is coupled to the open end of the second portion 22 to define the housing space together with the second portion 22. Alternatively, the first portion 21 and the second portion 22 can both be hollow structures with an open end, and the open end of the first portion 21 can be coupled to the open end of the second portion 22. Of course, the case 20 formed by the first portion 21 and the second portion 22 can have various shapes, such as a cylindrical shape, a cuboid shape, etc.

[0114] In the battery device 200, the battery cells 300 can be multiple, and the multiple battery cells 300 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery cells 300 are connected in series and in parallel. The multiple battery cells 300 can be directly connected in series, in parallel, or in a mixed manner, and the whole of the multiple battery cells 300 can be housed in the case 20. Of course, the battery device 200 can be configured such that the multiple battery cells 300 are connected in series, in parallel, or in a mixed manner to form battery modules, and the multiple battery modules are connected in series, in parallel, or in a mixed manner to form a whole, which is housed in the case 20. The battery device 200 can further include other structures, for example, the battery device 200 can further include a busbar member for electrically connecting the multiple battery cells 300.

[0115] Each of the battery cells 300 can be a secondary battery or a primary battery, and can be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cells 300 can have various shapes, such as a cylindrical shape, a flat shape, a cuboid shape, etc.

[0116] Referring to FIG. 1, Figure 4 The battery cell 300 refers to the smallest unit that constitutes a battery. For example, Figure 4 The battery cell 300 includes an end cap 32, a case 31, an electrode assembly 33, and other functional components.

[0117] The end cover 32 refers to a component that covers the opening 314 of the shell 31 to isolate the internal environment of the battery cell 300 from the external environment. Without limitation, the shape of the end cover 32 can be adapted to the shape of the shell 31 to fit the shell 31. Optionally, the end cover 32 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 32 is less likely to deform when subjected to extrusion collision, allowing the battery cell 300 to have higher structural strength and improved safety performance. The end cover 32 can be provided with functional components such as electrode terminals 321. The electrode terminals 321 can be used to electrically connect with the electrode assembly 33 for outputting or inputting the electrical energy of the battery cell 300. In some embodiments, the end cover 32 can also be provided with a pressure relief mechanism 34 for relieving the internal pressure of the battery cell 300 when the internal pressure or temperature reaches a threshold value. The material of the end cover 32 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon. In some embodiments, an insulating member can also be provided on the inner side of the end cover 32, which can be used to isolate the electrical connection components in the shell 31 from the end cover 32 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0118] The shell 31 is a component for fitting the end cover 32 to form the internal environment of the battery cell 300, wherein the formed internal environment can be used to accommodate the electrode assembly 33, electrolyte and other components. The shell 31 and the end cover 32 can be independent components, and the opening 314 can be provided on the shell 31, and the end cover 32 is covered on the opening 314 to form the internal environment of the battery cell 300. Without limitation, the end cover 32 and the shell 31 can also be integrated, specifically, the end cover 32 and the shell 31 can form a common connecting surface before other components enter the shell, and when it is necessary to encapsulate the internal environment of the shell 31, the end cover 32 is covered on the shell 31. The shell 31 can be various shapes and various sizes, such as cuboid, cylinder, hexagonal prism, etc. Specifically, the shape of the shell 31 can be determined according to the specific shape and size of the electrode assembly 33. The material of the shell 31 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon.

[0119] Please refer to Figures 6 to 12 , Figure 14 , Figure 16 , Figure 18According to some embodiments of the present application, the present application provides a battery cell 300, comprising a shell 30 and an electrode assembly 33, the shell 30 has a length direction X, a width direction Y and a height direction Z perpendicular to each other, the shell 30 has two opposite first side surfaces 311 in the width direction Y and two opposite second side surfaces 312 in the length direction X, the electrode assembly 33 is arranged in the inner cavity of the shell 30, and the electrode assembly 33 has a curved surface 33A at both ends in the length direction X; wherein the shell 30 further comprises an abutting surface 313 connecting the first side surface 311 and the second side surface 312.

[0120] The shell 30 refers to the shell structure forming the outer contour of the battery cell 300. As shown in the figure, the Z direction is the height direction of the shell 30, the X direction is the length direction of the shell 30, and the Y direction is the width direction of the shell 30. Figure 6

[0121] The electrode assembly 33 is a component for storing and releasing electric energy in the battery cell 300. The electrode assembly 33 is installed in the inner cavity of the shell 30 to be supported and protected by the shell 30. The electrode assembly 33 adopts a winding type design, and the curved surface 33A corresponds to the arc corner area formed by the winding process.

[0122] The abutting surface 313 refers to the transition surface connecting the first side surface 311 and the second side surface 312. The abutting surface 313 can be formed by stamping or cutting processing; or an inwardly recessed abutting structure can be provided, and the abutting surface 313 is formed on the abutting structure.

[0123] The abutting surface 313 is arranged to face the curved surface of the electrode assembly, and the position of the abutting surface 313 is offset towards the center of the electrode assembly 33 relative to the corner inner wall of the conventional square shell 400, that is, the abutting surface 313 is closer to the curved surface 33A of the electrode assembly 33 in space, shortens the distance between the corner of the shell 30 and the curved surface 33A of the electrode assembly 33, and improves the constraint ability of the shell 30 to the electrode assembly 33.

[0124] The abutting surface 313 can be designed as a plane, an arc surface or a plurality of continuously connected planes. The offset depth and curvature of the abutting surface 313 can be designed according to the curved surface 33A of the electrode assembly 33.

[0125] By arranging the abutting surface 313 offset to the electrode assembly 33, the weak structure prone to stress concentration at the traditional corner is changed, the shell 30 forms a support structure with higher strength at the abutting surface 313, which can effectively disperse the load generated in the corner area and avoid stress concentration at local points. At the same time, the abutting surface 313 can limit the corner part (curved surface 33A) of the electrode assembly 33 to prevent excessive deformation during charging and discharging.

[0126] ​In addition, by arranging the abutting surface 313 on the shell 30, the electrode assembly 33 can be arranged more closely inside the shell 30, so as to make full use of the limited space. This design not only improves the energy density, but also leaves more space for the subsequent cooling and heat dissipation system, further optimizing the comprehensive performance.

[0127] Compared with the traditional square shell 400, the abutting surface 313 has a good force transmission path, so that the stress is more evenly distributed along the wall surface of the shell 30, significantly reducing the maximum stress value. As shown in the simulation diagram of FIG. 13, arranging the abutting surface 313 at the corner of the shell 30 can effectively reduce the stress value at the corner, improve the structural strength and anti-deformation ability of the shell 30. Under the action of external extrusion or internal electrode assembly 33 expansion, the shell 30 has stronger bearing capacity and can withstand greater mechanical stress, thereby better inhibiting the deformation of the electrode assembly 33, protecting the electrode assembly 33, and significantly improving the structural safety of the battery monomer 300. Figures 13 to 16

[0128] The abutting surface 313 also has a certain buffering effect and can absorb part of the energy when the battery monomer 300 is subjected to external force impact, further improving the safety and reliability of the battery monomer 300.

[0129] In the technical scheme of the embodiments of the present application, by arranging the abutting surface 313 at the connecting area of the first side surface 311 and the second side surface 312, the abutting surface 313 is arranged towards the curved surface 33A of the electrode assembly 33, forming a support structure with high strength, which can effectively disperse the load at the corner of the shell 30, avoid stress concentration, effectively reduce the stress value at the corner, improve the structural strength and anti-deformation ability of the shell 30, and enhance the overall structural rigidity and bearing capacity, thereby better inhibiting the deformation of the electrode assembly 33, improving the performance and safety of the battery monomer 300.

[0130] In some embodiments of the present application, the abutting surface 313 is also used to abut the curved surface 33A to inhibit the expansion deformation of the electrode assembly 33 at the curved surface 33A.

[0131] The abutting surface 313 is arranged offset towards the curved surface 33A of the electrode assembly 33, and then forms a contact fit with the curved surface 33A, which can reduce the gap between the electrode assembly 33 and the shell 30, and limit the expansion space of the electrode assembly 33 at the curved surface 33A.

[0132] ​The abutting surface 313 exerts a pre-tightening force on the curved surface 33A of the electrode assembly 33 in the assembled initial state, and can effectively inhibit the expansion deformation of the electrode assembly 33 at the curved surface 33A when the electrode assembly 33 expands in volume during charging and discharging, thereby maintaining the close contact between the electrode assembly 33 and the shell 30, and making the adhesion between the layers of the electrode assembly 33 more firm. Thus, the liquid climbing defect of the electrolyte is reduced, the distribution of the electrolyte is more uniform, the risk of lithium precipitation at the curved surface 33A due to electrolyte bridge breaking is reduced, and the cycle life and safety of the battery are improved.

[0133] As Figure 11 The shell 30 has two opposite first side surfaces 311 in the width direction Y and two opposite second side surfaces 312 in the length direction X. The adjacent first side surface 311 and the second side surface 312 intersect to form four connecting regions, and each connecting region is provided with an abutting surface 313 connecting the two. Thus, one abutting surface 313 is arranged at each corner of the shell 30, thereby achieving support for the four corners of the electrode assembly 33.

[0134] Each abutting surface 313 is arranged towards the curved surface 33A of the electrode assembly 33, opposite the curved surface 33A and forming an abutting fit. When the electrode assembly 33 expands due to the charging and discharging cycle, the four abutting surfaces 313 can provide a restraining force to the corners of the curved surface 33A at both ends of the electrode assembly 33. At any end of the electrode assembly 33 in the length direction X, there are two abutting surfaces 313 and one second side surface 312, which can at least support three points of the curved surface 33A and provide uniform support and restraint.

[0135] The abutting surface 313 allows the shell 30 to better adapt to the geometric shape of the electrode assembly 33. In the corner regions at both ends of the electrode assembly 33, the shell 30 can precisely support the curved surface 33A of the electrode assembly 33, effectively fix and protect the curved surface 33A of the electrode assembly 33, and reduce the gap between the curved surface 33A of the electrode assembly 33 and the shell 30.

[0136] In some embodiments, experiments show that, by arranging the abutting surface 313 at the corners of the shell 30, the deformation amplitude of the electrode assembly 33 of the battery monomer 300 is reduced by about 30% under the same external force, and the structural stability is still good under extreme conditions.

[0137] In some embodiments of the present application, please refer to Figure 6 , Figures 8 to 11 The abutting surface 313 includes a first plane (not labeled in the figure) connected to the first side surface 311.

[0138] The first plane of the abutting surface 313 is connected with the first side surface 311, and the first plane can provide uniform support for the electrode assembly 33. The first plane can form an angle with the first side surface 311 so as to fit the curved surface 33A of the electrode assembly 33.

[0139] At the second side surface 312, the abutting surface 313 can also be provided with an arc surface or an inclined surface between the first plane and the second side surface 312, and a suitable structure form can be selected according to actual needs, which cooperates with the first plane.

[0140] By designing the first plane, a larger contact area with the electrode assembly 33 can be ensured, and uniform support force can be exerted on the curved surface 33A of the electrode assembly 33, thereby improving the electrolyte infiltration effect, reducing the risk of lithium precipitation, and avoiding damage to the electrode assembly 33. At the same time, the plane structure is convenient for processing and forming (such as stamping and bending), and is convenient for assembly, which is conducive to ensuring assembly consistency.

[0141] The plane structure also has good bending and compression stiffness, which can improve the resistance of the shell 30 to local deformation. The first plane can uniformly transmit the force received along the plane direction to the first side surface 311, avoiding load concentration at local points, thereby significantly reducing stress concentration at the corner.

[0142] In some embodiments of the present application, please refer to Figure 6 , Figures 8 to 11 The first plane is inclined to the first side surface 311.

[0143] By the inclined arrangement, the inclined first plane can form a more fitted support for the arc-shaped corner region (curved surface 33A) of the electrode assembly 33, increase the contact area, maintain stable interface pressure, suppress local expansion, and further promote uniform electrolyte infiltration of the electrode assembly 33, reduce the risk of lithium precipitation, and improve the reliability of the battery monomer 300.

[0144] And the inclined arrangement enables the second plane to more uniformly distribute pressure and reduce stress concentration of the electrode assembly 33 at the curved surface 33A. In addition, the inclination angle of the first plane can be specifically designed according to the structure of the curved surface 33A of the electrode assembly 33.

[0145] In some embodiments of the present application, please refer to Figure 11 The included angle between the first plane and the first side surface 311 is α, where 120°≤α≤150°.

[0146] The included angle α between the first plane and the first side surface 311 is set to 120°≤α≤150°. This angle range allows for good contact between the first plane and the curved surface 33A of the electrode assembly 33, effectively suppressing expansion and deformation while ensuring structural strength. It also facilitates uniform electrolyte wetting and reduces the risk of lithium plating. Furthermore, this angle range also considers ease of processing, avoiding increased manufacturing difficulty due to angles that are too small or too large.

[0147] As an example, the included angle α can be 120°, 125°, 130°, 135°, 140°, 145°, 150°, etc.

[0148] Please refer to some embodiments of this application. Figure 6 , Figures 8 to 11 The bearing surface 313 includes a second plane (not shown in the figure), which is connected to the second side surface 312.

[0149] The second plane of the abutment surface 313 is connected to the second side surface 312, and the second plane can provide uniform support for the electrode assembly 33. The second plane can form a certain angle with the second side surface 312 so as to conform to the curved surface 33A of the electrode assembly 33.

[0150] At the first side 311, the abutment surface 313 can be provided with an arc surface or an inclined surface to connect the first plane and the first side 311. A suitable structural form can be selected according to actual needs to cooperate with the second plane.

[0151] By designing a second plane, a larger contact area with the electrode assembly 33 can be ensured, and a uniform supporting force can be applied to the curved surface 33A of the electrode assembly 33, thereby improving the electrolyte wetting effect, reducing the risk of lithium plating, and avoiding damage to the electrode assembly 33. At the same time, the planar structure is easy to process and form (such as stamping and bending), and is easy to assemble during assembly, which helps to ensure assembly consistency.

[0152] The planar structure also has good bending and compressive stiffness, which can improve the shell 30's resistance to local deformation. The second plane can evenly transmit the applied force to the second side 312 along its planar direction, avoiding load concentration at local points, thereby significantly reducing stress concentration at corners.

[0153] Please refer to some embodiments of this application. Figure 6 , Figures 8 to 11 The second plane is inclined to the second side 312.

[0154] The inclined arrangement enables the second plane to better adapt to the shape of the curved surface 33A of the electrode assembly 33, to more uniformly bear against the curved surface 33A of the electrode assembly 33, to improve the supporting effect on the electrode assembly 33, to inhibit the swelling deformation of the electrode assembly 33 at the curved surface 33A, to further promote the uniform infiltration of the electrolyte of the electrode assembly 33, to reduce the risk of lithium precipitation, and to improve the structural stability and service life of the battery monomer 300.

[0155] The inclined arrangement enables the second plane to more uniformly distribute pressure, reducing stress concentration of the electrode assembly 33 at the curved surface 33A. In addition, the inclination angle of the first plane can be specifically designed according to the structure of the curved surface 33A of the electrode assembly 33.

[0156] In some embodiments of the present application, referring to Figure 11 , the included angle between the second plane and the second side surface 312 is β, where 120°≤β≤150°.

[0157] The included angle β between the second plane and the second side surface 312 is set to 120°≤α≤150°, which enables the second plane to achieve good contact with the curved surface 33A of the electrode assembly 33, effectively inhibiting swelling deformation while ensuring structural strength, and facilitating uniform electrolyte infiltration and reducing the risk of lithium precipitation. In addition, this angle range takes into account the ease of processing, avoiding increased manufacturing difficulty due to excessively small or large angles.

[0158] As an example, the included angle β can be 120°, 125°, 130°, 135°, 140°, 145°, 150°, etc.

[0159] In some embodiments of the present application, the bearing surface 313 includes a plurality of sequentially connected planes, and adjacent two planes are arranged at an obtuse angle, and the planes at both ends are connected with the first side surface 311 and the second side surface 312, respectively.

[0160] The bearing surface 313 is composed of a plurality of sequentially connected planes, adjacent planes form an included angle at the connection, and the included angle between adjacent planes is an obtuse angle (greater than 90°), and the two outermost planes are directly connected with the first side surface 311 and the second side surface 312 of the shell 30, respectively, thereby forming a continuous, transitional and gentle supporting surface between the first side surface 311 and the second side surface 312, for providing constraint to the curved surface 33A of the electrode assembly 33.

[0161] As an example, the obtuse angle can be 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, etc.

[0162] By setting the abutting surface 313 connected by multiple planes in sequence and forming an obtuse angle between adjacent planes, multi-segment contact support can be formed with the curved surface 33A of the electrode assembly 33, better fitting the edge profile of the curved surface 33A, increasing the contact area, effectively inhibiting the expansion of the gap at the corner of the electrode assembly 33, improving the uniformity of the electrode liquid distribution, and reducing the risk of lithium precipitation.

[0163] The zigzag structure can enhance the anti-deformation ability at the corner of the shell 30, ensure a certain structural rigidity, enhance the constraint ability of the electrode assembly 33 expansion, help to maintain the stability of the interface pressure, and improve the cycle life and safety of the battery monomer 300.

[0164] In some embodiments of the present application, please refer to Figure 6 , Figures 8 to 12 The abutting surface 313 is in a plane.

[0165] The abutting surface 313 is a single continuous plane, which is directly connected with the first side surface 311 and the second side surface 312 to form an entire support surface. The plane forms two included angles with the first side surface 311 and the second side surface 312, both of which are obtuse angles, and the angles can be set to be the same (as shown in Figure 11 ).

[0166] The abutting surface 313 is set as a whole plane, which is simple in structure and easy to process and form, such as through one-stroke stamping or bending process, which is conducive to improving the manufacturing precision and production efficiency of the shell 30, and facilitating assembly.

[0167] The abutting surface 313 uniformly contacts the surface of the curved surface 33A as a whole, which not only provides sufficient constraint to inhibit the expansion of the electrode assembly 33 and avoid uneven distribution of electrolyte in the corner area, but also effectively disperses the stress generated at the corner of the curved surface 33A when the electrode assembly 33 expands, thereby improving the structural reliability and cycle life of the battery monomer 300.

[0168] In some embodiments, the abutting surface 313 includes a first plane and a second plane, the first plane is connected with the first side surface 311, the second plane is connected with the second side surface 312, and the first plane and the second plane are connected with each other to form a continuous support structure, thereby improving the overall rigidity of the corner area and enhancing the anti-deformation ability. When the angle between the first plane and the second plane is 180°, the two planes are coplanar to form a complete and continuous plane abutting surface 313 (as shown in Figure 11 ), so that the stress is uniformly distributed and the structural strength is improved.

[0169] As shown in Figures 13 to 16As shown in the simulation diagram, during the expansion of the electrode assembly 33, the stress distribution of the shell 30 with the flat bearing surface 313 structure is more uniform, which significantly improves the problem of stress concentration in the corner area of the traditional square shell 400, effectively prevents the deformation of the shell 30 or the damage of the internal electrode assembly 33 caused by stress concentration, and improves the structural stability and safety of the battery monomer 300 cycle. And from Figure 14 and Figure 16 It can be seen that the shell 30 adopts the bearing surface 313 design, whether it is a thick shell or a thin shell, it can maintain excellent structural strength and anti-deformation ability.

[0170] In some embodiments of the present application, please refer to Figure 6 、 Figures 8 to 12 , the first side surface 311 and the second side surface 312 are connected by the bearing surface 313.

[0171] The first side surface 311 and the second side surface 312 of the shell 30 are smoothly connected by a continuous and integrally formed bearing surface 313. The bearing surface 313 can be a flat structure, or a curved structure concave towards the electrode assembly 33.

[0172] The bearing surface 313 is a structure directly formed on the inner wall of the shell 30 at the corner area, which can be processed by stamping or bending. The bearing surface 313 itself constitutes part of the side wall of the shell 30. Therefore, the entire side wall of the shell 30 is a continuous and integral structure.

[0173] By designing the bearing surface 313 as a transition structure, the side wall of the shell 30 forms an integrated continuous shell 30, which not only improves the overall structural strength and stiffness, but also uniformly transmits the stress generated by the expansion of the electrode assembly 33, reduces the stress concentration at the corner of the assembly, effectively suppresses the local expansion, reduces the gap between the electrode assembly 33 and the shell 30, and reduces the liquid climbing of the electrolyte.

[0174] At the same time, the bearing surface 313, as a natural extension of the inner wall, is well adapted to the curved surface 33A of the electrode assembly 33, and reliably supports the curved surface 33A of the electrode assembly 33 without adding additional parts, which is beneficial to improve the mechanical stability and cycle life of the battery monomer 300.

[0175] In some embodiments of the present application, a limiting structure is arranged in the shell 30 at the connection area between the first side surface 311 and the second side surface 312, and the surface of the limiting structure facing the electrode assembly 33 constitutes the bearing surface 313.

[0176] The limiting structure can be an independent component such as a support, a cushion block, etc., which is assembled and fixed to the corresponding position of the inner wall of the shell 30 in the later stage; or can be an integral structure with the shell 30, such as a protruding rib or boss directly formed by stamping, stretching or the like. The specific form of the limiting structure can be designed according to the structure of the curved surface 33A of the electrode assembly 33, and by designing the limiting structure, the expandability and adaptability of the shell 30 can be enhanced, which is suitable for different types and requirements of the battery monomer 300.

[0177] By providing support and limiting at the corners of the electrode assembly 33 through the limiting structure, the gap between the electrode assembly 33 and the shell 30 can be reduced, the swelling deformation of the electrode assembly 33 can be effectively inhibited, and the liquid climbing defect of the electrolyte at the curved surface 33A can be prevented, thereby reducing the risk of lithium precipitation. In addition, the additional limiting structure can also enhance the structural strength of the shell 30 and improve the overall stability of the battery monomer 300.

[0178] In some embodiments of the present application, the limiting structure includes a plurality of ribs spaced apart along the height direction Z.

[0179] A plurality of rib-shaped structures distributed along the height direction (Z direction) are provided, and the plurality of ribs protrude inward from the inner wall of the shell 30 and maintain a certain distance in the height direction Z. The extension width of each rib can cover the width of the curved surface 33A. The surface of each rib towards the electrode assembly 33 constitutes a local abutting surface 313, and the plurality of ribs collectively form a segmented support structure. The rib can adopt a strip-shaped structure or a block-shaped structure; the rib can be integrally stamped and formed by the shell 30 material, or can be an assembled independent component.

[0180] The rib can effectively enhance the structural strength of the shell 30, provide segmented support and limiting for the curved surface 33A of the electrode assembly 33 in the charging and discharging cycle of the electrode assembly 33, effectively disperse the stress generated by the swelling of the electrode assembly 33, and avoid stress concentration at a single position; it can not only provide sufficient restraint force to inhibit local swelling, but also allow the electrode assembly 33 to moderately buffer swelling in the non-supporting area to reduce internal stress accumulation. In addition, the structure can also adjust the number, spacing and height of the ribs to adapt to different types of battery monomers 300.

[0181] In some embodiments of the present application, please refer to Figure 6 , Figure 8 , Figure 9 and Figure 18 , the shell 30 includes a shell 31 and an end cover 32, the shell 31 has a first side surface 311, a second side surface 312 and an abutting surface 313, the shell 31 is provided with an opening 314, the electrode assembly 33 is arranged in the shell 31, the end cover 32 is connected to the shell 31 and seals the opening 314, and the outer wall of the end cover 32 is arranged in the inner wall of the opening 314 of the shell 31.

[0182] The shell 31 itself has a first side surface 311, a second side surface 312 and an abutting surface 313 for supporting the curved surface 33A of the electrode assembly 33, and the shell 31 is provided with an opening 314 for accommodating the electrode assembly 33, and the opening 314 is connected and sealed by the end cover 32, realizing the assembly and reliable sealing of the battery monomer 300.

[0183] The outer wall of the end cover 32 is matched with the inner wall of the opening 314 of the shell 31, ensuring the fitting accuracy when the two are assembled, and improving the sealing performance, structural stability and safety of the battery monomer 300.

[0184] As shown in the simulation results of Figure 17 and Figure 18 The stress distribution and carrying capacity of the end cover 32 area of the shell 30 of the present application are basically consistent with those of the traditional square shell 400, and there is no difference. Therefore, the abutting surface 313 structure is arranged on the side wall of the shell 31, the end cover 32 is matched with the shell 31, and the mechanical properties of the end cover 32 are not affected. While improving the structural strength of the shell 30, the present application can effectively inhibit the expansion of the electrode assembly 33, thereby ensuring the safety of the battery monomer 300.

[0185] According to some embodiments of the present application, a battery monomer 300 is provided, which comprises a shell 30 and an electrode assembly 33. The shell 30 has a length direction (X direction), a width direction (Y direction) and a height direction (Z direction) perpendicular to each other. The shell 30 comprises a shell body 31 and an end cover 32. The shell body 31 has two opposite first side surfaces 311 in the width direction Y, two opposite second side surfaces 312 in the length direction X, and a butt surface 313 connecting the first side surface 311 and the second side surface 312. The shell body 31 is provided with an opening 314. The electrode assembly 33 is arranged in the shell body 31. The end cover 32 is connected to the shell body 31 and seals the opening 314. The outer wall of the end cover 32 is arranged in the opening 314 of the shell body 31 in a matching manner. The two ends of the electrode assembly 33 in the length direction X have curved surfaces 33A. The butt surface 313 is arranged offset towards the curved surface 33A of the electrode assembly 33. The butt surface 313 is arranged in a plane and is transitionally connected to the first side surface 311 and the second side surface 312. By arranging the butt surface 313 in the connecting area of the first side surface 311 and the second side surface 312, the butt surface 313 is arranged in a plane and is transitionally connected to the first side surface 311 and the second side surface 312, so that the shell body 31 forms a continuous and high-rigidity support structure at the corner, and effectively supports and limits the curved surface 33A of the electrode assembly 33, which helps to inhibit the expansion of the electrode assembly 33, maintains the close contact between the layers of the electrode assembly 33, improves the electrolyte infiltration effect, and thus reduces the risk of lithium precipitation caused by electrolyte bridge breaking. The design of the butt surface 313 can also optimize the mechanical properties of the shell 30, improve the structural strength of the shell body 31 without affecting the mechanical properties of the end cover 32, improve the anti-deformation ability, effectively protect the internal electrode assembly 33 while inhibiting the expansion of the electrode assembly 33, and thus improve the safety of the battery monomer 300.

[0186] According to some embodiments of the present application, the present application also provides a battery device 200, which comprises a box body 20 and a battery monomer 300 as described in the above embodiments.

[0187] The box body 20 refers to a shell structure forming the outline of the battery device 200. The battery monomer 300 is installed in the box body 20 to be supported and protected by the box body 20. The number and arrangement of the battery monomers 300 can be designed according to actual needs.

[0188] In some embodiments of the present application, please refer to Figure 2 , Figure 3 and Figure 12 , the battery device 200 comprises a battery monomer assembly, which comprises a plurality of battery monomers 300 arranged in a first direction; and an installation space 201 is formed between the butt surfaces 313 of two adjacent battery monomers 300 in the first direction.

[0189] The first direction can be a length direction X or a width direction Y of the box 20, etc.

[0190] The plurality of battery monomers 300 are arranged in sequence along the first direction, each battery monomer 300 has two abutting surfaces 313 recessed towards the inner cavity, and an installation space 201 is formed between the abutting surfaces 313 of two adjacent battery monomers 300 along the arrangement direction. The installation space 201 can be used as a layout space for other structures of the battery device 200. Not only more installation space 201 can be left for structures such as electrical structures, thermal management structures 202 or detectors, but also the energy density of the battery device 200 is improved, and the expansion and deformation of the electrode assembly 33 are effectively inhibited.

[0191] In some embodiments of the present application, referring to Figure 12 The battery device 200 includes a thermal management structure 202, and the thermal management structure 202 includes a thermal management part suitable for the installation space 201.

[0192] The thermal management structure 202 is, for example, a cooling pipe or a cooling plate, and the thermal management part is, for example, a bending structure on the cooling plate. By forming the installation space 201 between the abutting surfaces 313 of the adjacent battery monomers 300, the thermal management part of the thermal management structure 202 can extend into the installation space 201, and the structural gap naturally generated by the arrangement of the battery monomers 300 is fully utilized, so that the thermal management structure 202 is efficiently integrated.

[0193] The thermal management structure 202 can be flexibly designed according to the size and shape of the installation space 201, and can better fit the abutting surfaces 313 of the battery monomers 300, increase the contact area, and further increase the heat dissipation efficiency.

[0194] In some embodiments of the present application, the battery device 200 includes a detector, and the detector is arranged in the installation space 201.

[0195] The detector can be a temperature sensor, a gas sensor or a pressure sensor, etc. After the adjacent battery monomers 300 are arranged, the abutting surfaces 313 of the two battery monomers 300 form an installation space 201, and the detector can be installed in the space, so that additional mounting structures or other spaces are not needed, and the space utilization of the battery device 200 is improved.

[0196] The arrangement of the detector can be flexibly designed according to the size and shape of the installation space 201, and the connection mode of the detector can also be selected according to the shape of the abutting surface 313, for example, the detector can be fixed by a bracket or embedded in the inner wall of the installation space 201.

[0197] According to some embodiments of the present application, the present application also provides a power utilization device, which includes the battery monomer 300 according to the above-mentioned embodiments and the battery device 200 according to the above-mentioned embodiments.

[0198] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: An outer casing having mutually perpendicular length, width, and height directions; the outer casing having two opposing first sides in the width direction and two opposing second sides in the length direction; and... An electrode assembly is disposed within the inner cavity of the housing, and the electrode assembly has curved surfaces at both ends along the length direction; The outer casing also includes a support surface connecting the first side and the second side; The supporting surface is planar.

2. The battery cell as described in claim 1, characterized in that, The supporting surface is also used to support the curved surface to suppress the expansion and deformation of the electrode assembly at the curved surface.

3. The battery cell as described in claim 1, characterized in that, The supporting surface includes a first plane, which is connected to the first side surface.

4. The battery cell as described in claim 3, characterized in that, The first plane is inclined to the first side surface.

5. The battery cell as described in claim 4, characterized in that, The angle formed by the first plane and the first side surface is α, where 120°≤α≤150°.

6. The battery cell as described in claim 1, characterized in that, The abutting surface includes a second plane, which is connected to the second side surface.

7. The battery cell as described in claim 6, characterized in that, The second plane is inclined to the second side surface.

8. The battery cell as described in claim 7, characterized in that, The angle between the second plane and the second side is β, where 120°≤β≤150°.

9. The battery cell as described in claim 1, characterized in that, The bearing surface includes a plurality of planes connected in sequence, with an obtuse angle between adjacent planes, and the planes at both ends are connected to the first side and the second side, respectively.

10. The battery cell according to any one of claims 1 to 9, characterized in that, The first side and the second side are connected by the abutment surface.

11. The battery cell according to any one of claims 1 to 9, characterized in that, The housing has a limiting structure in the connection area between the first side and the second side, and the surface of the limiting structure facing the electrode assembly forms the abutment surface.

12. The battery cell as described in claim 11, characterized in that, The limiting structure includes a plurality of ribs spaced apart along the height direction.

13. The battery cell according to any one of claims 1 to 9, characterized in that, The housing includes a shell and an end cap. The shell has a first side, a second side, and a supporting surface. The shell has an opening. The electrode assembly is placed inside the shell. The end cap is connected to the shell and seals the opening. The outer wall of the end cap is adapted to fit the inner wall of the opening of the shell.

14. A battery device, characterized in that, It includes a housing and a battery cell as described in any one of claims 1 to 13, wherein the battery cell is installed in the housing.

15. The battery device as claimed in claim 14, characterized in that, The battery device includes a battery cell assembly, which includes a plurality of battery cells arranged along a first direction; an installation space is formed between the abutting surfaces of two adjacent battery cells along the first direction.

16. The battery device as claimed in claim 15, characterized in that, The battery device includes a thermal management structure, which includes a thermal management unit adapted to be disposed in the installation space.

17. The battery device as claimed in claim 15, characterized in that, The battery device includes a detector, which is placed in the mounting space.

18. An electrical appliance, characterized in that, Includes a battery cell according to any one of claims 1 to 13, and a battery device according to any one of claims 14 to 17.

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