Battery cell, battery, and electrical apparatus

Abstract

A battery cell (7), a battery (2), and an electrical apparatus. The battery cell (7) comprises an end cover (30), a casing (20), and a first connecting member (6). The casing (20) has a first opening, the end cover (30) covering the first opening. The first connecting member (6) is formed by protruding outwards in the circumferential direction of the casing, is connected to the end cover (30), and is used for bending outwards in the circumferential direction of the first opening so as to absorb the deformation of the casing (20). Configuring the first connecting member (6) to connect the end cover (30) to the casing (20) improves the strength and stability of connection between the end cover (30) and the casing (20). In addition, the first connecting member (6) can bend outwards in the circumferential direction of the first opening, so as to adapt to the deformation of the casing (20) caused by the squeezing of a swollen electrode assembly, thereby reducing the risk of cracking a welding joint between the end cover (30) and the casing (20), and improving the operation stability of the battery cell (7).

Description

Battery cell, battery and electric device

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202420710512.6, filed on April 8, 2024, entitled “Battery cell, battery and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the field of batteries, in particular to a battery cell, a battery and an electric device. BACKGROUND

[0004] Battery cells are widely used in electronic devices, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes, electric tools and energy storage systems, etc. Battery cells can include cadmium-nickel battery cells, hydrogen-nickel battery cells, lithium-ion battery cells, sodium-ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.

[0005] During the operation of the battery cell, swelling and deformation occur, which causes the welded connection of the battery shell to crack, causing the battery cell to leak and be damaged. Therefore, improvements are needed to improve the stability of the battery cell in operation.

[0006] SUMMARY

[0007] In view of the above problems, the present application provides a battery cell, a battery and an electric device, which can improve the structural strength and stability of the connection between the end cover and the shell in the battery cell, and improve the stability of the battery cell in operation.

[0008] In a first aspect, the present application provides a battery cell, comprising an end cover, a shell and a first connecting member. The shell has a first opening, and the end cover covers the first opening. The first connecting member is formed outward along the circumference of the shell, and the first connecting member is connected to the end cover. The first connecting member is used to bend outward along the circumference of the first opening to absorb the deformation of the shell.

[0009] In the technical solution of the present application, the end cover and the shell are provided to provide a stable environment for the electrode assembly. The first connecting member connects the end cover and the shell, improves the strength and stability of the connection between the end cover and the shell, and the first connecting member can bend outward along the circumference of the first opening to adapt to the deformation of the shell caused by the swelling of the electrode assembly, reduce the risk of cracking at the welded connection between the end cover and the shell, and improve the stability of the battery cell in operation.

[0010] In some embodiments, the first connecting member comprises a connecting portion and a welding portion. The connecting portion is connected to the shell, and the connecting portion extends outward along the circumference of the opening. The welding portion is connected between the connecting portion and the end cover, and the welding portion and the connecting portion intersect at an angle. In the above structure, the connecting portion is connected to the shell to form a firm connection, the welding portion is connected to the end cover to form a firm connection, and the connecting portion and the welding portion form an angle. When the shell deforms, the displacement caused by the deformation of the shell can be absorbed by the change in the angle, reducing the risk of welding fracture between the shell and the end cover, and improving the stability of the connection between the shell and the end cover.

[0011] In some embodiments, the surface of the connecting portion facing the end cover is concave to form a first recess, and the surface of the connecting portion away from the end cover is convex to form a first convex portion. By providing a first recess on the surface of the connecting portion, the weak area of the structure is formed, the deformation is guided to occur at the weak part, the stress concentration of the welding connection is reduced, the stability of the welding connection is improved, and the risk of cracking of the shell and the end cover is reduced.

[0012] In some embodiments, the surface of the connecting portion away from the end cover is concave to form a second recess, and the surface of the connecting portion facing the end cover is convex to form a second convex portion. By providing a second recess on the back surface of the connecting portion, a weak area of the structure is formed, the deformation is guided to occur at the weak part, the stress concentration of the welding connection is reduced, the stability of the welding connection is improved, and the risk of cracking of the shell and the end cover is reduced.

[0013] In some embodiments, the side of the end cover facing the shell is concave to form a receiving portion, and the receiving portion is used to accommodate at least part of the welding portion. By providing a receiving portion, the contact area between the welding portion and the shell is increased, and the strength of the connection between the welding portion and the shell is improved.

[0014] In some embodiments, the shell further comprises a bottom plate, a side plate, a pressure relief valve, and a second connecting member. The bottom plate is arranged opposite to the end cover, and the side plate is connected between the bottom plate and the end cover. The pressure relief valve is arranged on the bottom plate, and the second connecting member is arranged between the side plate and the bottom plate. The second connecting member is convex outward along the circumference of the side plate, and the second connecting member is used to bend outward along the circumference of the side plate to absorb the deformation of the side plate. By providing a pressure relief valve, the excess substances inside the battery monomer are discharged, the pressure inside the battery monomer is reduced, and the risk of combustion and explosion of the battery monomer is reduced. The second connecting member is arranged on the bottom plate to absorb the displacement caused by the deformation of the side plate, reduce the risk of fracture of the welding connection between the bottom plate and the side plate, reduce the risk of early opening of the pressure relief valve, and improve the structural strength of the battery shell.

[0015] In some embodiments, the second connecting member is symmetrically arranged with the first connecting member. In the above structure, the connecting connecting member is symmetrically arranged to simplify the production difficulty, and the pressure received by the end cover and the bottom plate is evenly distributed to improve the stability of the shell structure.

[0016] In some embodiments, a receiving cavity is formed between the shell and the first connecting member, and the receiving cavity is used to accommodate the heat exchange plate or the buffer pad. In the above structure, the receiving cavity is used to accommodate the heat exchange plate or the buffer pad, and the heat exchange plate or the buffer pad can be limited, the structural stability is improved, the risk of interference between the heat exchange plate or the buffer pad and the first connecting member is reduced, the occupied space is reduced, and the compactness of the structure is improved.

[0017] In a second aspect, the present application provides a battery cell.

[0018] In a third aspect, the present application provides a power consuming device, which comprises the battery cell.

[0019] The above description is only a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application, the above description can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0020] The features, advantages and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0021] FIG. 1 is a structural schematic diagram of a vehicle according to an embodiment of the present application;

[0022] FIG. 2 is an exploded structural schematic diagram of a battery according to an embodiment of the present application;

[0023] FIG. 3 is a structural schematic diagram of a battery cell according to an embodiment of the present application;

[0024] FIG. 4 is a cross-sectional structural schematic diagram of a battery cell according to an embodiment of the present application;

[0025] FIG. 5 is an enlarged structural schematic diagram of circle frame A in FIG. 4;

[0026] FIG. 6 is another enlarged structural schematic diagram of circle frame A in FIG. 4;

[0027] FIG. 7 is still another enlarged structural schematic diagram of circle frame A in FIG. 4.

[0028] Detailed description of the accompanying drawings: 1. vehicle; 2. battery; 10. electrode assembly; 20. shell; 24. pressure relief mechanism; 30. end cover; 40. outer shell; 3. controller; 4. motor; 5. box; 51. first part; 52. second part; 53. accommodating space; 6. first connecting member; 601. connecting part; 602. welding part; 603. first recess; 604. first protrusion; 605. second recess; 606. second protrusion; 7. battery cell. DETAILED DESCRIPTION

[0029] 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.

[0030] 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 and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0031] In the description of the embodiments of this application, the technical terms "first" and "second" 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 clearly and specifically defined.

[0032] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] 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.

[0034] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0035] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships 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.

[0036] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0037] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle provided by an embodiment of the present application. The vehicle 1 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile or a range extended automobile, etc. The vehicle 1 is internally provided with a battery 2, which can be arranged at the bottom, head or tail of the vehicle 1. The battery 2 can be used for power supply of the vehicle 1, for example, the battery 2 can be used as an operating power source of the vehicle 1. The vehicle 1 can further include a controller 3 and a motor 4, and the controller 3 is used to control the battery 2 to supply power to the motor 4, for example, to meet the power demand of the vehicle 1 during starting, navigation and driving.

[0038] In some embodiments of the present application, the battery 2 can not only be used as an operating power source of the vehicle 1, but also be used as a driving power source of the vehicle 1, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1.

[0039] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0040] Please refer to FIG. 2, which is an exploded structural schematic diagram of a battery provided by an embodiment of the present application. The battery includes a box body 5 and a battery monomer 7, and the battery monomer is accommodated in the box body. Among them, the box body is used to provide an accommodation space for the battery monomer, and the box body can adopt various structures.

[0041] In some optional embodiments, the box body 5 includes a first part 51 and a second part 52 , the first part 51 and the second part 52 cover each other, and the first part 51 and the second part 52 jointly define an accommodating space 53 for accommodating the battery cell 7 .

[0042] In some embodiments, the box 5 can serve as part of the chassis structure of the vehicle 1. For example, part of the box 5 can become at least part of the floor of the vehicle 1, or part of the box 5 can become at least part of the crossbeam and longitudinal beam of the vehicle 1.

[0043] In battery 2, there may be multiple battery cells 7, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the battery cells 7. Multiple battery cells 7 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery cell 7 is housed within the housing 5. Alternatively, battery 2 may be constructed by first connecting multiple battery cells 7 in series, in parallel, or in a hybrid configuration to form a battery module. The multiple battery modules are then connected in series, in parallel, or in a hybrid configuration to form a single unit, which is then housed within the housing 5. Battery 2 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 7.

[0044] Each battery cell 7 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 7 can be cylindrical, flat, rectangular, or in other shapes.

[0045] In some embodiments, the battery cells 7 are connected by busbars to realize series or parallel connection of the circuits. For example, the busbars include busbars, busbars, and the like.

[0046] Please refer to Figure 3, which is a schematic diagram of the exploded structure of a battery cell 7 provided in some embodiments of the present application. A battery cell 7 is the smallest unit that makes up a battery 2. As shown in Figure 3, a battery cell 7 includes a housing 40, an electrode assembly 10, and other functional components.

[0047] The outer shell 40 may include an end cap 30 and a shell 20. The end cap 30 refers to a component that covers the opening of the shell 20 to isolate the internal environment of the battery cell 7 from the external environment. Without limitation, the shape of the end cap 30 can be adapted to the shape of the shell 20 to match the shell 20. Optionally, the end cap 30 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 30 is not easily deformed when squeezed or collided, so that the battery cell 7 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals can be provided on the end cap 30. The electrode terminal can be used to electrically connect to the electrode assembly 10 for outputting or inputting electrical energy of the battery cell 7.

[0048] In some embodiments, the end cover 30 can further be provided with a pressure relief mechanism 24 for relieving internal pressure when the internal pressure or temperature of the battery cell 7 reaches a threshold value. Exemplarily, the pressure relief mechanism 24 can be a pressure relief valve. The material of the end cover 30 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.

[0049] The shell 20 is a component for cooperating with the end cover 30 to form an internal environment of the battery cell 7. The formed internal environment can be used to accommodate the electrode assembly 10, electrolyte and other components. The shell 20 and the end cover 30 can be independent components, and an opening can be provided on the shell 20, and the end cover 30 is covered on the opening to form the internal environment of the battery cell 7.

[0050] The electrode assembly 10 is a component in which electrochemical reactions occur in the battery cell 7. One or more electrode assemblies 10 can be contained in the shell 20. A plurality of electrode assemblies 10 constitute an electrode unit. The electrode assembly 10 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 7, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time can allow the active ions to pass through. In some embodiments, the electrode assembly 10 further includes a separator arranged between the positive electrode and the negative electrode.

[0051] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is arranged between the positive electrode and the negative electrode, and at the same time plays the role of transmitting ions and isolating the positive and negative electrodes.

[0052] In some embodiments, the battery cell 7 further includes an electrolyte, which plays the role of conducting ions between the positive and negative electrodes. The present application does not have specific limitations on the type of electrolyte, which can be selected according to the needs. The electrolyte can be liquid, gel or solid.

[0053] In some embodiments, the electrode assembly 10 is a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into a jelly-roll structure. In some embodiments, the electrode assembly 10 is a stacked structure. In some embodiments, the shape of the electrode assembly 10 can be cylindrical, flat or polygonal, etc. In some embodiments, the electrode assembly 10 is provided with a tab, which can guide the current out of the electrode assembly 10. The tab includes a positive tab and a negative tab.

[0054] In the charging and discharging process of the battery monomer, the electrode assembly expands to press the shell, causing the shell to deform, stress concentration to the welding connection part of the shell and the end cover, and cracking of the connection area of the end cover and the shell. Moreover, the above-mentioned pressing also causes a certain pulling to the pressure relief valve, which leads to the pressure relief valve being pulled open in advance, thereby causing liquid leakage and the like.

[0055] Based on the above problems, the battery monomer provided in the embodiments of the present application sets the end cover and the shell to provide a stable environment for the operation of the electrode assembly, and reduces the influence of external impurities and water vapor on the electrode assembly. Moreover, the first connecting member is arranged to connect the end cover and the shell, thereby improving the strength and stability of the connection between the end cover and the shell. The first connecting member can be bent outward along the circumference of the first opening, can adapt to the deformation of the shell caused by the expansion of the electrode assembly, reduces the risk of cracking at the welding connection between the end cover and the shell, reduces the pulling of the pressure relief valve caused by the deformation of the shell, reduces the risk of the pressure relief valve being opened in advance, and improves the stability of the operation of the battery monomer.

[0056] The battery monomer of the embodiments of the present application will be described in detail below with reference to the accompanying drawings. Please refer to FIGS. 3 to 7, FIG. 3 is a structural schematic diagram of the battery monomer of one embodiment of the present application; FIG. 4 is a cross-sectional structural schematic diagram of the battery monomer of one embodiment of the present application; FIG. 5 is an enlarged structural schematic diagram of the circular frame A in FIG. 4; FIG. 6 is another enlarged structural schematic diagram of the circular frame A in FIG. 4; and FIG. 7 is still another enlarged structural schematic diagram of the circular frame A in FIG. 4.

[0057] As shown in the drawings, the battery monomer 7 of the embodiments of the present application includes an end cover 30, a shell 20, and a first connecting member 6. The shell 20 has a first opening, and the end cover 30 covers the first opening. The first connecting member 6 protrudes outward along the circumference of the shell 20, and the first connecting member 6 is connected to the end cover 30. The first connecting member 6 is used to bend outward along the circumference of the first opening to absorb the deformation of the shell 20.

[0058] In the battery monomer 7, the end cover 30 and the shell 20 are arranged as a basic structure to provide a closed containing space 53 for the battery monomer 7. The shell 20 is provided with a first opening to facilitate the electrode assembly 10 to enter the inside of the shell 20, and the end cover 30 covers the first opening of the shell 20, effectively protecting the electrode assembly 10 in the shell 20 from external environment.

[0059] Further, the first connecting member 6 is outwardly protruded along the circumference of the shell 20 and connected to the end cover 30. The first connecting member 6 serves as an intermediate part for connecting the end cover 30 and the shell 20, which not only enhances the connection strength between the end cover 30 and the shell 20, but also improves the overall stability. In addition, the first connecting member 6 is composed of a material with certain toughness, elasticity and ductility, such as metal material. The first connecting member 6 can be bent outwardly along the circumference of the first opening. When the electrode assembly 10 expands and presses the shell 20, the first connecting member 6 can absorb such deformation, thereby avoiding the cracking of the welding connection between the end cover 30 and the shell 20 due to stress concentration. At the same time, the pulling stress on the pressure relief valve caused by the deformation of the shell 20 can be avoided, and the risk of the pressure relief valve being pulled open can be reduced. Therefore, through the bending design of the first connecting member 6, the battery monomer 7 can better adapt to the expansion of the electrode assembly 10, reduce the risk of cracking, and improve the stability of the operation of the battery monomer 7.

[0060] In the technical scheme of the embodiments of the present application, the end cover 30 and the shell 20 are provided, and the electrode assembly 10 is provided with a stable environment. The first connecting member 6 connects the end cover 30 and the shell 20, improves the strength and stability of the connection between the end cover 30 and the shell 20, and the first connecting member 6 can be bent outwardly along the circumference of the first opening, which can adapt to the deformation of the shell 20 caused by the expansion of the electrode assembly 10, reduce the risk of cracking at the welding connection between the end cover 30 and the shell 20, and improve the stability of the operation of the battery monomer 7.

[0061] In some embodiments of the present application, the first connecting member 6 includes a connecting part 601 and a welding part 602. The connecting part 601 is connected to the shell 20, and the connecting part 601 extends outwardly along the circumference of the opening. The welding part 602 is connected between the connecting part 601 and the end cover 30, and the welding part 602 and the connecting part 601 are arranged at an angle.

[0062] The connecting part 601 is the part connected to the shell 20, which extends outwardly along the circumference of the opening. This design enables the connecting part 601 to be tightly and firmly connected with the shell 20 to form an integral whole. When the battery 2 is in the charging process, the electrode assembly 10 expands and presses the shell 20, and the connecting part 601 can provide sufficient strength and stability to prevent excessive deformation or rupture of the shell 20.

[0063] The welding portion 602 is a portion connected between the connecting portion 601 and the end cover 30, and is arranged at an angle with the connecting portion 601. For example, the angle between the welding portion 602 and the connecting portion 601 can be 30°, 45°, 60°, or 90°. This angle design allows the welding portion 602 to extend the connection length between the shell 20 and the end cover 30 by changing the angle when the shell 20 is deformed, thereby absorbing the displacement caused by the deformation. In this way, even if the shell 20 deforms to a certain extent, the welding portion 602 can maintain stable connection with the end cover 30, avoiding cracking or breaking at the welding site.

[0064] Through this structural design, the first connecting member 6 not only enhances the connection strength between the end cover 30 and the shell 20, but also improves the stability of the connection between them. During the operation of the battery 2, even if the electrode assembly 10 expands, the first connecting member 6 can effectively absorb the deformation of the shell 20, reduce the risk of cracking at the welding site, and thus ensure that the battery cell 7 can operate stably and improve the overall safety.

[0065] As shown in FIG. 6, in some embodiments of the present application, the surface of the connecting portion 601 facing the end cover 30 is concave to form a first recess 603, and the surface of the connecting portion 601 away from the end cover 30 is convex to form a first convex portion 604.

[0066] By setting the first recess 603 as a weak area in the structure of the surface of the connecting portion 601, the stress concentration at the welding connection is reduced. During the expansion of the battery 2, if there is no first recess 603, the welding connection may become a stress concentration area, increasing the risk of cracking. With the first recess 603, the stress is guided to the weak area, thereby reducing the stress level at the welding connection. At the same time, the first convex portion 604 increases the overall thickness of the weak area, reducing the risk of breaking of the connecting portion 601. Since the stress is effectively dispersed and alleviated, the welding connection can better maintain its integrity, reducing the possibility of cracking. This helps to ensure that the battery cell 7 can still maintain stable structure and performance during the expansion process.

[0067] Therefore, the above structure reduces the risk of cracking of the shell 20 and the end cover 30. By guiding the deformation to occur at the weak part, the first recess 603 reduces the stress impact on the shell 20 and the end cover 30 during the expansion process, thereby reducing the risk of cracking of them.

[0068] As shown in FIG7 , in some embodiments of the present application, the surface of the connecting portion 601 facing away from the end cap 30 is concave to form a second concave portion 605, and the surface of the connecting portion 601 facing the end cap 30 is convex to form a second convex portion 606. By providing the second concave portion 605, a structurally weak area is formed on the back side of the connecting portion 601, guiding deformation to occur in the weak area, reducing stress concentration at the welded connection, improving the stability of the welded connection, and reducing the risk of cracking of the housing 20 and the end cap 30.

[0069] In some embodiments of the present application, a side of the end cover 30 facing the housing 20 is concave to form an accommodating portion, and the accommodating portion is used to accommodate at least a portion of the welding portion 602 .

[0070] The provision of the accommodating portion increases the contact area between the welding portion 602 and the housing 20. During the welding process, a larger and more stable weld area is formed between the welding portion 602 and the housing 20. This increased contact area not only improves weld strength but also makes the weld connection more secure and reliable, reducing the risk of weld fracture during battery 2 operation.

[0071] Secondly, the design of the housing also helps improve the overall structural strength of the battery cell 7. By accommodating the weld portion 602 within the housing, the connection between the end cap 30 and the housing 20 is tightened, forming a more stable overall structure. This design allows the battery cell 7 to better resist deformation and rupture when subjected to external forces or internal stress, thereby improving the durability and safety of the battery 2.

[0072] In addition, the accommodation portion also helps optimize the internal space layout of the battery cell 7. By accommodating the welding portion 602 inside the end cover 30, the internal space of the battery cell 7 can be more effectively utilized, thereby improving the energy density and overall performance of the battery 2.

[0073] In some embodiments of the present application, the housing 20 further includes a bottom plate, side plates, a pressure relief valve, and a second connecting member. The bottom plate is disposed opposite the end cap 30, with the side plates connected between the bottom plate and the end cap 30. The pressure relief valve is disposed on the bottom plate, and the second connecting member is disposed between the side plates and the bottom plate. The second connecting member protrudes outwardly along the circumference of the side plates and is configured to bend outward along the circumference of the side plates to absorb deformation of the side plates.

[0074] In the housing 20, the bottom plate and end cap 30 are arranged opposite each other, providing a stable bottom support for the battery cell 7. The side panels are connected between the bottom plate and the end cap 30, forming the side structure of the battery cell 7. This design ensures the stability and integrity of the overall structure of the battery cell 7. The provision of a pressure relief valve can promptly release excess material from the battery cell 7, thereby effectively reducing the pressure inside the battery cell 7 and reducing the risk of safety accidents such as combustion or explosion of the battery 2.

[0075] Further, the second connecting member is formed outwardly along the circumferential direction of the side plate, which can absorb the displacement of the side plate when deformed. Such a design reduces the risk of cracking at the welding connection between the bottom plate and the side plate, and also reduces the risk of the pressure relief valve opening prematurely due to external pressure. By enhancing the structural strength of the battery 2 shell 20, this design ensures that the battery monomer 7 can still operate stably in complex environments, improves the safety and stability of the battery 2, optimizes the internal structure arrangement of the battery 2, and reduces the risk of safety accidents during operation of the battery 2.

[0076] As shown in FIG. 5, in some alternative embodiments, the included angle a between the connecting part 601 and the side plate is: 30°≤a≤90°. The connecting part 601 bends outward relative to the side plate when the shell is deformed, thereby absorbing the relative displacement between the side plate and the end cover 30 caused by the deformation of the side plate. The acute angle a provides more angle space for the deformation of the shell 20, further reducing the risk of cracking of the shell 20 and the end cover 30.

[0077] In some embodiments of the present application, the second connecting member is symmetrically arranged with the first connecting member 6. Symmetrical arrangement of the connecting member can simplify the production process. During production, the symmetrical design allows the mold, clamp and assembly process to be unified, reducing the switching and adjustment time between different parts on the production line. This not only improves production efficiency, but also reduces production costs.

[0078] Secondly, the symmetrical design helps to evenly distribute the pressure on the end cover 30 and the bottom plate. During the operation of the battery monomer 7, especially during charging and discharging, the expansion and contraction of the electrode assembly 10 will generate certain pressure on the end cover 30 and the bottom plate. By symmetrically arranging the first connecting member 6 and the second connecting member, these pressures can be evenly distributed to the structure of the entire battery monomer 7, avoiding the problem of local stress concentration. This not only reduces the risk of structural damage, but also prolongs the service life of the battery monomer 7.

[0079] The symmetrical structure also improves the overall stability of the battery monomer 7. When subjected to external impact or vibration, the symmetrical structure can better resist deformation and cracking, and the battery monomer 7 can form a more balanced stress distribution when stressed, thereby improving its impact resistance and vibration resistance.

[0080] In some embodiments of the present application, a receiving cavity is formed between the shell 20 and the first connecting member 6, which is used to accommodate the heat exchange plate or the buffer pad. In the above structure, the receiving cavity is used to accommodate the heat exchange plate or the buffer pad, which can limit the heat exchange plate or the buffer pad, improve the structural stability, and reduce the risk of interference between the heat exchange plate or the buffer pad and the first connecting member 6, reduce the occupied space, and improve the compactness of the structure.

[0081] The embodiments of the present application provide a battery 2 comprising the battery cell 7 in the above embodiments. The embodiments of the present application also provide a power consuming device comprising the battery 2 in the above embodiments, and the battery 2 is used to provide electric energy. The end cover 30 and the shell 20 are arranged in the battery cell 7, which provides a stable environment for the operation of the electrode assembly 10 and reduces the influence of external impurities and water vapor on the electrode assembly 10. In particular, the first connecting member 6 is arranged in the battery cell 7 to connect the end cover 30 and the shell 20, which improves the strength and stability of the connection between the end cover 30 and the shell 20. The first connecting member 6 can be bent outward along the first opening in the circumferential direction, which can adapt to the deformation of the shell 20 caused by the expansion of the electrode assembly 10, reduce the risk of cracking at the welded connection between the end cover 30 and the shell 20, reduce the pulling of the pressure relief valve caused by the deformation of the shell 20, reduce the risk of the pressure relief valve opening prematurely, and improve the stability of the operation of the battery cell 7.

[0082] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement to part or all of the technical features; 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 specification of the present application. Especially, 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 in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell (7), characterized in that: include: End cap (30); The housing (20) has a first opening, and the end cover (30) covers the first opening; A first connecting member (6) is formed to protrude outward along the circumference of the shell (20), the first connecting member (6) is connected to the end cover (30), and the first connecting member (6) is used to bend outward along the circumference of the first opening to absorb deformation of the shell (20).

2. The battery cell (7) according to claim 1, characterized in that The first connecting member (6) comprises: a connecting portion (601) connected to the housing (20), and the connecting portion (601) extends outward along the circumference of the opening; The welding portion (602) is connected between the connecting portion (601) and the end cover (30), and the welding portion (602) and the connecting portion (601) are arranged to intersect at a certain angle.

3. The battery cell (7) according to claim 2, characterized in that The surface of the connecting portion (601) facing the end cover (30) is concave to form a first concave portion (603), and the surface of the connecting portion (601) facing away from the end cover (30) is convex to form a first convex portion (604).

4. The battery cell (7) according to claim 2, characterized in that The surface of the connecting portion (601) facing away from the end cover (30) is concave to form a second concave portion (605), and the surface of the connecting portion (601) is convex toward the end cover (30) to form a second convex portion (606).

5. The battery cell (7) according to claim 2, characterized in that A side of the end cover (30) facing the housing (20) is concave to form a receiving portion, and the receiving portion is used to receive at least a portion of the welding portion (602).

6. The battery cell (7) according to any one of claims 1 to 5, characterized in that: The housing (20) further comprises: a bottom plate, arranged opposite to the end cover (30); a side plate connected between the bottom plate and the end cover (30); a pressure relief valve, provided on the bottom plate; The second connecting member is provided between the side plate and the bottom plate. The second connecting member is formed to protrude outward along the circumference of the side plate. The second connecting member is used to bend outward along the circumference of the side plate to absorb deformation of the side plate.

7. The battery cell (7) according to claim 6, characterized in that The second connecting member is symmetrically arranged with the first connecting member (6).

8. The battery cell (7) according to claim 1, characterized in that An accommodating cavity is formed between the shell (20) and the first connecting member (6), and the accommodating cavity is used to accommodate a heat exchange plate or a buffer pad.

9. A battery (2), characterized in that The invention comprises a battery cell (7) according to any one of claims 1 to 8.

10. An electrical device, characterized in that: The electrical device comprises the battery (2) according to claim 9, and the battery (2) is used to provide electrical energy.

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