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, an electrode assembly, an electrode terminal and a sealing element, the shell comprises a first wall part, the first wall part comprises a main body part, an extension part and an electrode leading-out hole which are connected, the extension part is arranged on the peripheral side of the electrode leading-out hole, and at least part of the extension part protrudes out of the side, facing the electrode assembly, of the main body part. The electrode terminal is connected to the main body part, the electrode terminal is electrically connected with the electrode assembly, the electrode terminal comprises a first terminal part located on the outer side of the first wall part, and part of the electrode terminal is contained in the electrode lead-out hole. The sealing element is arranged in the thickness direction of the first wall part, and at least part of the sealing element is arranged between the extending part and the first terminal part. The reliability of the battery monomer can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery monomer, a battery device and a power consumption device. BACKGROUND

[0002] Battery monomers are widely used in electronic devices, such as mobile phones, notebook computers, electric vehicles, electric vehicles, electric aircraft, electric ships, electric toy cars, electric toy ships, electric toy aircraft and electric tools, etc. Battery monomers can include cadmium-nickel battery monomers, hydrogen-nickel battery monomers, lithium-ion battery monomers and secondary alkaline zinc-manganese battery monomers, etc.

[0003] In the development of battery technology, how to improve the reliability of battery monomers has always been a research direction in battery technology. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery monomer, a battery device and a power consumption device, which can improve the reliability of the battery monomer.

[0005] In the first aspect, the present application provides a battery monomer, which comprises a shell, an electrode assembly, an electrode terminal and a sealing member. The shell comprises a first wall part, the first wall part comprises a main body part and an extension part connected with each other and an electrode lead-out hole, the extension part is arranged on the peripheral side of the electrode lead-out hole, and at least part of the extension part protrudes from the side of the main body part facing the electrode assembly. The electrode terminal is connected to the main body part, the electrode terminal is electrically connected to the electrode assembly, the electrode terminal comprises a first terminal part located outside the first wall part, and part of the electrode terminal is located in the electrode lead-out hole. The sealing member is arranged between the extension part and the first terminal part in the thickness direction of the first wall part.

[0006] In the above scheme, when the battery monomer expands and deforms, the first wall part and the electrode terminal deform away from the inside of the battery monomer. Due to the connection of the electrode terminal to the main body part, the deformation amount of the electrode terminal and the main body part is greater than that of the extension part under the influence of internal load, working temperature and other factors, so that the extension part and the sealing member (or the electrode terminal) are separated when the battery monomer expands and deforms, an exhaust passage is generated, and the gas is discharged, thereby reducing the possibility of gas accumulation in the battery monomer, improving the overall pressure relief range and pressure relief elasticity of the battery monomer, prolonging the service life of the battery monomer, and improving the reliability of the battery monomer.

[0007] In some embodiments, the extension and the sealing member are both provided with interfitting structures in the thickness direction of the first wall portion, the interfitting structures on the extension and the interfitting structures on the sealing member can make the extension and the sealing member tightly combine together to form a stable whole, so as to realize the sealing between the electrode terminal and the first wall portion, improve the sealing performance of the battery monomer, and when subjected to the internal expansion force of the battery monomer, the interfitting structures can also be separated to form an exhaust passage, and after the exhaust is completed, the interfitting structures are embedded together again under the internal load of the shell and the electrode terminal to realize the resealing between the electrode terminal and the first wall portion, thereby improving the service life of the battery monomer.

[0008] In some embodiments, the extension includes a first part and a second part, the first part is connected to the second part away from one end of the main part, and the second part protrudes from the first part in a direction away from the electrode assembly. The sealing member includes a first recess, at least part of the second part is arranged in the first recess, and the second part and the recess form the interfitting structures.

[0009] In the above scheme, through the above arrangement, it is beneficial to simplify the interfitting structures on the extension and the sealing member, reduce the preparation difficulty and assembly difficulty of the extension and the sealing member, and improve the preparation cost of the battery monomer.

[0010] In some embodiments, the sealing member includes a first sealing part and a second sealing part, the first sealing part is connected to the second sealing part near one end of the main part, the first sealing part is provided with a first recess, and the second sealing part protrudes from the first sealing part in a direction toward the electrode assembly. The first part is provided with a second recess, at least part of the second sealing part is arranged in the second recess, and the second sealing part and the second recess form the interfitting structures.

[0011] In the above scheme, through the above arrangement, it is beneficial to further increase the contact area between the sealing member and the extension, thereby increasing the sealing performance of the sealing member and the extension, and improving the reliability of the battery monomer.

[0012] In some embodiments, the sealing member further includes a third sealing part, at least part of the third sealing part is accommodated in the electrode lead-out hole.

[0013] In the above scheme, by providing the third sealing part, it is beneficial to increase the sealing area between the electrode terminal and the first wall portion, reduce the possibility of internal short circuit of the battery monomer caused by the electrical connection between the extension and the electrode terminal, and improve the reliability of the battery monomer.

[0014] In some embodiments, the extension further includes a third part, the third part is connected to the main part and the first part, and at least one of the first part and the main part is arranged to be bent relative to the third part.

[0015] In the above scheme, by arranging the third part to make the first part and the second part bend towards the inside of the battery monomer, the distance between the electrode terminal and the main body connection area and the extension part is adjusted, the difference between the electrode terminal and the main body expansion deformation and the extension part expansion deformation is further increased, thereby the pressure threshold required when the exhaust passage between the electrode terminal and the extension part is opened is adjusted, and the application range of the battery monomer is improved.

[0016] In some embodiments, the plane where the side surface of the extension part away from the electrode assembly is located is between the plane where the side surface of the first wall part away from the electrode assembly is located and the electrode assembly, so as to increase the distance between the electrode terminal and the main body connection area and the extension part, further increase the difference between the electrode terminal and the main body expansion deformation and the extension part expansion deformation, thereby facilitating the adjustment of the pressure threshold required when the exhaust passage between the electrode terminal and the extension part is opened, and improving the application range of the battery monomer.

[0017] In some embodiments, the distance between the side surface of the extension part facing the electrode assembly and the side surface of the first wall part facing the electrode assembly is L, the thickness of the first wall part is h, and L and h satisfy the relationship: 0

[0018] In the above scheme, by setting the ratio of the distance between the side surface of the extension part away from the electrode assembly and the side surface of the first wall part away from the electrode assembly to the thickness of the first wall part to be greater than 0, the extension part can receive the gas pressure inside the battery monomer, and the fit between the electrode terminal and the main body is strengthened; the ratio of the distance between the side surface of the extension part away from the electrode assembly and the side surface of the first wall part away from the electrode assembly to the thickness of the first wall part is set to be less than or equal to 6, so as to reduce the possibility that the extension part bends or even the first wall part deforms due to insufficient strength of the extension part, and reduce the possibility of interference between the extension part and other structural parts in the electrode assembly or the battery monomer. The assembly difficulty of the battery monomer is reduced, and the reliability of the battery monomer is improved.

[0019] In some embodiments, the first terminal part includes a terminal main part and a protruding part, the protruding part is arranged on the circumferential side of the terminal main part, and in the thickness direction of the first wall part, at least part of the sealing member is located between the protruding part and the extension part.

[0020] In the above scheme, by the above arrangement, the sealing area of the sealing member and the first terminal part is improved, and the overall size of the first terminal part is reduced, the reliability of the battery monomer is improved, and the overall volume of the battery monomer is reduced.

[0021] In some embodiments, the size of the protruding part in the thickness direction of the first wall part is D, the thickness of the first wall part is h, and D and h satisfy the relationship: 0.05

[0022] In the above scheme, by setting the ratio of the size of the convex portion along the thickness direction of the first wall portion to the thickness of the first wall portion to be greater than or equal to 0.05, the expansion deformation amount of the electrode terminal and the main body portion is increased, the opening of the exhaust passage of the battery cell when expanding is realized, and the reliability of the battery cell is improved; by setting the ratio of the size of the convex portion along the thickness direction of the first wall portion to the thickness of the first wall portion to be less than or equal to 2, the rigidity of the convex portion itself is improved, the compression of the sealing element does not fail, and the sealing property between the convex portion and the sealing element is improved.

[0023] In some embodiments, the electrode terminal further comprises a second terminal portion, at least part of the second terminal portion is accommodated in the electrode lead-out hole, the second terminal portion is connected with the first terminal portion, and the first wall portion can limit the second terminal portion in the radial direction of the electrode lead-out hole, so as to realize the fixation of the electrode terminal on the first wall portion.

[0024] In some embodiments, the second terminal portion comprises a first sub-portion located in the electrode lead-out hole and a second sub-portion located outside the first wall portion, and the second sub-portion connects the first sub-portion and the first terminal portion. In the thickness direction of the first wall portion, at least part of the second sub-portion is located between the sealing element and the first terminal portion.

[0025] In the above scheme, the size of the first sub-portion along the radial direction of the electrode lead-out hole can be less than the size of the second sub-portion along the radial direction of the electrode lead-out hole, at least part of the second sub-portion is located between the sealing element and the first terminal portion, the rigidity of the contact area between the electrode terminal and the sealing element is increased, the sealing performance of the electrode terminal and the sealing element is improved, the connection area of the first terminal portion and the second terminal portion is increased, and the connection strength of the first terminal portion and the second terminal portion is improved.

[0026] In some embodiments, the size of the first terminal portion along the radial direction of the electrode lead-out hole is d, and the thickness of the first wall portion is h, and d and h satisfy the relationship: 1≤d / h≤35.

[0027] In the above scheme, by setting the ratio of the size of the first terminal portion along the radial direction of the electrode lead-out hole to the thickness of the first wall portion to be greater than or equal to 1, the overall rigidity of the first wall portion is improved, and the possibility of the strength of the electrode terminal being reduced due to excessive deformation of the first wall portion is reduced; by setting the ratio of the size of the first terminal portion along the radial direction of the electrode lead-out hole to the thickness of the first wall portion to be less than or equal to 35, the elastic deformation amount of the connection between the first wall portion and the electrode terminal is improved, and the space occupied by the first wall portion is reduced, and the energy density of the battery cell is improved.

[0028] In some embodiments, the size of the first terminal portion along the radial direction of the electrode lead-out hole is d, and 5mm≤d≤16mm.

[0029] In the above scheme, by setting the dimension of the first terminal part along the radial direction of the electrode lead-out hole to be greater than or equal to 5 mm, the expansion deformation amount of the electrode terminal and the main body part when the internal pressure of the battery monomer is low is increased, thereby reducing the pressure threshold for opening of the exhaust passage between the electrode terminal and the extension part, reducing the possibility of gas accumulation in the battery monomer, and improving the service life and reliability of the battery monomer; and by setting the dimension of the first terminal part along the radial direction of the electrode lead-out hole to be less than or equal to 16 mm, the rigidity of the electrode terminal itself is improved, and the pressure range of the exhaust pressure of the battery monomer as a whole is improved.

[0030] In some embodiments, the shell further comprises a connecting piece, the connecting piece being arranged on the outer side of the first wall part, and the electrode terminal is connected to the main body part through the connecting piece.

[0031] In the above scheme, by arranging the connecting piece to limit the position of the electrode terminal in the thickness direction, the connection structure of the electrode terminal and the first wall part is simplified, and the preparation yield of the battery monomer is improved.

[0032] In some embodiments, the connecting piece comprises an insulating piece, and the surface of the insulating piece is provided with a hydrophobic layer.

[0033] In the above scheme, by arranging the insulating piece to reduce the possibility of electrical connection between the electrode terminal and the first wall part, and by arranging the hydrophobic layer on the surface of the insulating piece to reduce the possibility of water vapor entering the battery monomer from the outside of the battery monomer through the exhaust passage, the reliability of the battery monomer is improved.

[0034] In some embodiments, the shell comprises a shell body and an end cover, the shell body has an opening, and the end cover is connected to the shell body and covers the opening. The end cover is the first wall part.

[0035] In the above scheme, compared with the shell body, the end cover generally has a larger thickness. By arranging the first electrode terminal on the end cover, the connection strength between the first electrode terminal and the end cover can be improved, the stability of the first electrode terminal can be improved, and the risk of deviation of the first electrode terminal can be reduced.

[0036] In a second aspect, the embodiments of the present application provide a battery device, comprising the battery monomer in any of the preceding embodiments.

[0037] In a third aspect, the embodiments of the present application provide a power consumption device, comprising the battery device in any of the preceding embodiments, and the battery device is used to provide electric energy for the power consumption device.

[0038] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, 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

[0039] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application;

[0041] Figure 2 This is a schematic diagram of the exploded structure of a battery provided in an embodiment of this application;

[0042] Figure 3 This is a schematic diagram of the structure of a battery module provided in an embodiment of this application;

[0043] Figure 4 This is a schematic diagram of the exploded structure of a single battery cell provided in an embodiment of this application;

[0044] Figure 5 This is a schematic cross-sectional view of a single battery cell provided in an embodiment of this application;

[0045] Figure 6 yes Figure 5 A schematic diagram of an enlarged structure of P;

[0046] Figure 7 yes Figure 5 A schematic diagram of another enlarged structure of P;

[0047] Figure 8 yes Figure 5 A schematic diagram of another enlarged structure of P;

[0048] Figure 9 yes Figure 5 A schematic diagram of an enlarged structure of Q.

[0049] Marker description

[0050] 1000, vehicles;

[0051] 100. Battery assembly; 200. Controller; 300. Motor; 400. Housing; 410. First housing section; 420. Second housing section; 430. Receiving section; 500. Battery module;

[0052] 110. Battery cell;

[0053] 10, housing; 11, case; 12, end cover; 10a, first wall portion; 1, main body portion; 2, extension portion; 2a, first portion; 2b, second portion; 2c, third portion; 2d, second recess; 3, electrode lead-out hole;

[0054] 20, electrode terminal; 21, first terminal portion; 211, terminal main body portion; 212, protruding portion; 22, second terminal portion; 221, first sub-portion; 222, second sub-portion;

[0055] 30, electrode assembly; 31, electrode main body; 32, tab;

[0056] 40, seal; 41, first seal portion; 42, second seal portion; 43, third seal portion; 44, first recess; 50, connecting member; 51, fixing member; 52, insulating member; 60, adapter; Z, thickness direction. DETAILED DESCRIPTION

[0057] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0058] 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 terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0059] If not specifically stated, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0060] If not specifically stated, all technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0061] In the description of the embodiments of the present application, the technical terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0062] 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 mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment in a manner known to those of ordinary skill in the art.

[0063] In the description of the embodiments of the application, the term“and / or” only means an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character“ / ” herein generally means that the front and rear associated objects are in an“or” relationship.

[0064] In the description of the embodiments of the application, the term“a plurality of” means more than two (including two), and similarly, “a plurality of groups” means more than two groups (including two groups), and “a plurality of pieces” means more than two pieces (including two pieces).

[0065] In the description of the embodiments of the 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 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 application.

[0066] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0067] In the embodiments of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0068] 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.

[0069] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can prevent the positive and negative electrodes from short-circuiting while allowing the active ions to pass through.

[0070] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0071] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0072] As an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0073] In some embodiments, the battery apparatus can be a battery pack including a box and one or more battery cell assemblies accommodated in the box.

[0074] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0075] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0076] As an example, the box can include a first box and a second box. The first box and the second box are fastened so that an enclosed space is formed inside the box to accommodate the battery cell assembly. Here, the enclosed means covered or closed, and can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0077] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected to the frame, respectively, so that an enclosed space is formed inside the box to accommodate the battery cell assembly.

[0078] In some embodiments, the box can be part of a chassis structure of a vehicle. For example, portions of the box can become at least part of a floor of the vehicle, or portions of the box can become at least part of cross beams and longitudinal beams of the vehicle.

[0079] The technical solutions described in the embodiments of the present application are applicable to various battery monomer using electric devices, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, such as spacecraft including airplanes, rockets, space shuttles and spaceships.

[0080] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0081] At present, from the development of market situation, the application of battery device is more and more widely. The battery device is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of battery device, the demand of its market is also increasing.

[0082] The exhaust of the battery monomer mainly relies on the opening of the explosion-proof valve to release the internal gas pressure risk of the battery monomer. When the internal pressure of the battery monomer is lower than the actuating pressure, the explosion-proof valve does not exhaust, and with the accumulation of gas generated in the battery monomer, the internal pressure of the battery monomer reaches the actuating pressure, causing the explosion-proof valve to open. When the explosion-proof valve opens, the battery exhaust system is scrapped, causing the battery monomer to be scrapped, so that the battery monomer cannot be used again, which is not conducive to improving the service life of the battery monomer and reducing the reliability of the battery monomer.

[0083] Based on the above technical problems, the present application provides a technical solution. When the battery monomer expands and deforms, the first wall portion and the electrode terminal deform away from the inside of the battery monomer. Due to the connection of the electrode terminal to the main body portion, under the influence of internal load, working temperature and other factors, the deformation amount of the electrode terminal and the main body portion is greater than that of the extension portion, so that when the battery monomer expands and deforms, the extension portion and the sealing element (or the electrode terminal) are separated, an exhaust passage is generated, and the gas is discharged, thereby reducing the possibility of gas accumulation in the battery monomer, improving the overall pressure relief range and pressure relief elasticity of the battery monomer, improving the service life of the battery monomer, and improving the reliability of the battery monomer.

[0084] The technical solutions described in the embodiments of the present application are applicable to a battery and a power consumption device using the battery, and the power consumption device is, for example, a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric automobile, a ship, a spacecraft, an electric toy and an electric tool, and the like, wherein the spacecraft is, for example, an airplane, a rocket, a space shuttle and a spacecraft, and the like, the electric toy includes, for example, a fixed or mobile electric toy, and specifically, for example, a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, and the like, and the electric tool includes, for example, a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, and specifically, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer.

[0085] The battery cell described in the embodiments of the present application is not only limited to the power consumption device described above, but for the sake of brevity, the following embodiments are described by taking an electric automobile as an example.

[0086] Please refer to Figure 1 , Figure 1 is a structural schematic diagram of a vehicle provided by the embodiments of the present application. The vehicle 1000 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 electric automobile or a range extended automobile, and the like. The vehicle 1000 can be provided with a battery device 100, for example, at the bottom, the front or the rear of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the power supply of the motor 300 by the battery. The battery can be used for starting and navigation of the vehicle 1000, and of course, the battery device 100 can also be used to drive the vehicle 1000 to run, instead of or partially instead of fuel or natural gas to provide driving for the vehicle 1000.

[0087] Figure 2 is an explosion structural schematic diagram of a battery provided by the embodiments of the present application. As shown in Figure 2 , the battery device 100 includes a box body 400 and a battery cell (not shown in the figure), and the battery cell is contained in the box body 400.

[0088] The box 400 is used to accommodate the battery cell, and the box 400 can be of various structures. In some embodiments, the box 400 can include a first box part 410 and a second box part 420, the first box part 410 and the second box part 420 are mutually covered, and the first box part 410 and the second box part 420 jointly define an accommodation part 430 for accommodating the battery cell. The second box part 420 can be a hollow structure with one end open, and the first box part 410 is a plate-like structure, which is covered on the open side of the second box part 420 to form the box with the accommodation part 430; the first box part 410 and the second box part 420 can also be hollow structures with one side open, and the open side of the first box part 410 is covered on the open side of the second box part 420 to form the box 400 with the accommodation part 430. Of course, the first box part 410 and the second box part 420 can be of various shapes, such as a cylinder, a cuboid, etc.

[0089] In the battery device 100, the battery cell can be one or multiple. If the battery cell is multiple, the multiple battery cells can be connected in series, in parallel or in a mixed manner, and the mixed manner means that the multiple battery cells are connected in series and in parallel. The multiple battery cells can be directly connected in series, in parallel or in a mixed manner, and then the whole of the multiple battery cells is accommodated in the box 400; of course, the multiple battery cells can be first connected in series, in parallel or in a mixed manner to form a battery module 500, and then the multiple battery modules 500 are connected in series, in parallel or in a mixed manner to form a whole and are accommodated in the box 400.

[0090] Figure 3 FIG. 1 is a structural schematic diagram of a battery module provided by an embodiment of the present application.

[0091] In some embodiments, as shown in FIG. 1, the battery cell 110 is multiple, and the multiple battery cells 110 are first connected in series, in parallel or in a mixed manner to form a battery module 500. The multiple battery modules 500 are then connected in series, in parallel or in a mixed manner to form a whole and are accommodated in the box. Figure 3

[0092] Figure 4 FIG. 2 is an explosion structural schematic diagram of a battery cell provided by an embodiment of the present application.

[0093] Please refer to FIG. 1, Figure 4 In some embodiments, the battery cell 110 includes a shell 10 and an electrode assembly 30, and the electrode assembly 30 is accommodated in the shell 10. The shell 10 is a hollow structure, and an accommodation space for accommodating the electrode assembly 30 and electrolyte is formed in the shell 10. The shape of the shell 10 can be determined according to the specific shape of the electrode assembly 30. For example, if the electrode assembly 30 is a cuboid structure, a cuboid shell 10 can be selected.

[0094] ​The shell 10 is a hollow structure, and an accommodation space is formed inside the shell 10 for accommodating the electrode assembly 30 and electrolyte. The shape of the shell 10 can be determined according to the specific shape of the electrode assembly 30. For example, if the electrode assembly 30 is a cuboid structure, a cuboid shell 10 can be selected.

[0095] In some embodiments, the shell 10 includes a shell body 11 having an opening and an end cover 12 connected to the shell body 11 and covering the opening; the shell body 11 is a component for cooperating with the end cover 12 to form an internal cavity of the battery monomer 110, and the internal cavity formed can be used to accommodate the electrode assembly 30, electrolyte and other components.

[0096] The shell body 11 and the end cover 12 can be independent components. For example, an opening can be provided on the shell body 11, and the end cover 12 is used to cover the opening to form the internal cavity of the battery monomer 110.

[0097] The shell body 11 can be various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. In particular, the shape of the shell body 11 can be determined according to the specific shape and size of the electrode assembly 30. The material of the shell body 11 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiments of the present application do not make special limitations.

[0098] The shape of the end cover 12 can be adapted to the shape of the shell body 11 to cooperate with the shell body 11. The material of the end cover 12 can be the same as or different from the material of the shell body 11. Optionally, the end cover 12 can be made of a material with certain hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.), so that the end cover 12 is not easy to deform when subjected to extrusion and collision, so that the battery monomer 110 can have higher structural strength, and the reliability can also be improved.

[0099] The end cover 12 is connected to the shell body 11 by welding, bonding, clamping or other means.

[0100] The shell body 11 can be open at one end or both ends. In some examples, the shell body 11 can be a structure open on one side, and the end cover 12 is provided as one and covers the shell body 11. In other examples, the shell body 11 can also be a structure open on both sides, and the end cover 12 is provided as two, and the two end covers 12 cover the two openings of the shell body 11 respectively.

[0101] The electrode assembly 30 is a component in which electrochemical reactions occur in the battery monomer 110. One or more electrode assemblies 30 can be contained in the shell body 11.

[0102] In some embodiments, the electrode assembly 30 includes a positive electrode tab and a negative electrode tab. During charging and discharging of the battery cell 110, active ions (e.g., lithium ions) are intercalated and deintercalated between the positive electrode tab and the negative electrode tab.

[0103] In some embodiments, the electrode assembly 30 further includes a separator film disposed between the positive electrode tab and the negative electrode tab, which can function to prevent short circuiting between the positive and negative electrodes while allowing the active ions to pass through.

[0104] In some embodiments, the positive electrode tab can include a positive current collector and a positive film layer disposed on at least one surface of the positive current collector. Exemplarily, the portion of the positive current collector on which the positive film layer is not disposed can serve as the positive tab 32.

[0105] By way of example, the positive current collector has two opposing surfaces in the thickness direction Z thereof, and the positive film layer is disposed on either or both of the two opposing surfaces of the positive current collector. Optionally, the positive film layer can include a positive active material layer.

[0106] In some embodiments, the negative electrode tab can include a negative current collector and a negative film layer disposed on at least one surface of the negative current collector. Exemplarily, the portion of the negative current collector on which the negative film layer is not disposed can serve as the negative tab 32. Optionally, the negative film layer can include a negative active material layer.

[0107] In some embodiments, the electrode assembly 30 includes an electrode body 31 and tabs 32, which include positive tabs and negative tabs. The positive tabs and the negative tabs are led out from the main body portion 1.

[0108] By way of example, the positive electrode tab has a portion of the positive current collector coated with the positive film layer, a portion of the negative current collector coated with the negative film layer, the positive film layer, the negative film layer, and the separator film constitute the electrode body 31. The positive tabs and the negative tabs can be led out from the same end of the main body portion 1, or can be led out from the two ends of the electrode body 31, respectively.

[0109] In some embodiments, the electrode assembly 30 is in a jelly-roll structure. The positive electrode tab and the negative electrode tab are wound into the jelly-roll structure.

[0110] In some embodiments, the battery cell 110 includes electrode terminals 20, which include a first electrode terminal 20 and a second electrode terminal 20 insulated from each other. The first electrode terminal 20 is electrically connected to the positive tab 32, and the second electrode terminal 20 is electrically connected to the negative tab 32. The first electrode terminal 20 and the second electrode terminal 20 are used to be electrically connected to an external circuit to achieve charging or discharging of the battery cell 110.

[0111] As an example, the first electrode terminal 20 may be a separately formed component that is mounted on the housing 10. Alternatively, the first electrode terminal 20 may also be part of the housing 10.

[0112] As an example, the second electrode terminal 20 may be a separately formed component that is mounted on the housing 10. Alternatively, the second electrode terminal 20 may also be part of the housing 10.

[0113] In some embodiments, both the first electrode terminal 20 and the second electrode terminal 20 are disposed on the end cap 12. As an example, the end cap 12, the first electrode terminal 20 and the second electrode terminal 20 can be pre-assembled together and then assembled with the electrode assembly 30 and the housing 11.

[0114] Figure 5 This is a cross-sectional structural diagram of a battery cell provided in an embodiment of this application. Figure 6 yes Figure 5 A schematic diagram of an enlarged structure of P. Figure 7 yes Figure 5 Another enlarged structural diagram of P. Figure 8 yes Figure 5 Another enlarged structural diagram of P. Figure 5 The housing and electrode assembly are not shown.

[0115] like Figure 4 to Figure 8 As shown, this application embodiment provides a battery cell 110, which includes a housing 10, an electrode assembly 30, electrode terminals 20, and a sealing member 40. The housing 10 includes a first wall portion 10a, which includes a main body portion 1 and an extension portion 2 connected together, as well as an electrode lead-out hole 3. The extension portion 2 is disposed around the electrode lead-out hole 3, and at least a portion of the extension portion 2 protrudes from the side of the main body portion 1 facing the electrode assembly 30. The electrode terminals 20 are connected to the main body portion 1 and electrically connected to the electrode assembly 30. The electrode terminals 20 include a first terminal portion 21 located outside the first wall portion 10a, and a portion of the electrode terminals 20 is located within the electrode lead-out hole 3. The sealing member 40 is located in the thickness direction Z of the first wall portion 10a, and at least a portion of the sealing member 40 is disposed between the extension portion 2 and the first terminal portion 21.

[0116] As an example, the first wall portion 10a can be an end cap 12 or a wall of the housing 11.

[0117] In some examples, the extension 2 encloses the electrode lead-out hole 3, and an end of the extension 2 away from the axis of the electrode lead-out hole 3 is connected to the main body 1. Optionally, a projection of the extension 2 in the thickness direction Z of the first wall 10a is a continuous closed shape. In other examples, the electrode lead-out hole 3 is provided on the main body 1, and the extension 2 is formed by a surface of the main body 1 on a side of the main body 1 toward the electrode lead-out hole 3 extending in the direction of the axis of the electrode lead-out hole 3. Optionally, the extension 2 includes a plurality of sub-parts, and the plurality of sub-parts are distributed along the circumference of the electrode lead-out hole 3.

[0118] At least part of the extension 2 protrudes from the side of the main body 1 toward the electrode assembly 30. It can be understood that part or the whole of the structure of the extension 2 protrudes from the side surface of the main body 1 toward the electrode assembly 30. For example, the extension 2 includes a first surface facing away from the electrode body 31 and a second surface facing toward the electrode body 31. In some examples, the plane in which the first surface is located is between the plane in which the side surface of the main body 1 toward the electrode assembly 30 is located and the electrode assembly 30, that is, the whole structure of the extension 2 protrudes from the side surface of the main body 1 toward the electrode assembly 30. In other examples, the structure between the second surface and a predetermined thickness of the extension 2, for example, half the thickness of the extension 2, protrudes from the plane in which the side surface of the main body 1 toward the electrode assembly 30 is located, that is, part of the structure of the extension 2 protrudes from the side surface of the main body 1 toward the electrode assembly 30.

[0119] In some examples, the thickness of the main body 1 and the thickness of the extension 2 are the same, and of course, they can also be different.

[0120] In some examples, the thickness of the extension 2 can be uniform, or the thickness of the extension 2 can also be non-uniform. For example, the thickness of the extension 2 is gradually reduced in the direction in which the main body 1 points to the extension 2. It can be understood that the side of the extension 2 toward the electrode assembly 30 protrudes, so that the side of the extension 2 facing away from the electrode assembly 30 is recessed relative to the main body 1.

[0121] In some examples, the electrode terminal 20 includes a first electrode terminal 20 and a second electrode terminal 20. The number of the seal 40 is two, and in the thickness direction Z of the first wall 10a, at least part of one of the seals 40 is provided between the protrusion 212 of the first electrode terminal 20 and the extension 2. In the thickness direction Z of the first wall 10a, at least part of the other of the seals 40 is provided between the protrusion 212 of the second electrode terminal 20 and the extension 2.

[0122] The electrode lead-out hole 3 includes a first electrode lead-out hole 3 and a second electrode lead-out hole 3, a part of structure of the first electrode terminal 20 is arranged in the first electrode lead-out hole 3, and at least a part of structure of the second electrode terminal 20 is arranged in the second electrode lead-out hole 3.

[0123] In some examples, the electrode assembly 30 includes an electrode body 31 and a tab 32, the tab 32 protrudes from the electrode body 31 toward one side of the first wall portion 10a, and the tab 32 is electrically connected with the electrode terminal 20. Optionally, the tab 32 and the electrode terminal 20 can be directly connected or electrically connected through the adapter 60.

[0124] Optionally, in the thickness direction Z of the first wall portion 10a, the projection of the electrode lead-out hole 3 falls within the projection of the first terminal portion 21 of the electrode terminal 20.

[0125] Optionally, the electrode terminal 20 can further include a second terminal portion 22, and the second terminal portion 22 is located in the electrode lead-out hole 3.

[0126] Optionally, the electrode terminal 20 is connected with the main body portion 1 through the first terminal portion 21.

[0127] Optionally, the main body portion 1 is connected with the first terminal portion 21 near the end of the electrode lead-out hole 3.

[0128] It can be understood that the electrode terminal 20 is connected with the main body portion 1, and the electrode terminal 20 and the main body portion 1 can be insulated to reduce the possibility of short circuit between the positive electrode terminal 20 and the negative electrode terminal 20. The electrode terminal 20 and the main body portion 1 can also be electrically connected, for example, one of the positive electrode terminal 20 and the negative electrode terminal 20 is arranged to be insulated with the main body portion 1, and the other is arranged to be electrically connected with the main body portion 1.

[0129] The sealing member 40 can be used for sealing between the electrode terminal 20 and the first wall portion 10a. Optionally, one of the electrode terminal 20 and the first wall portion 10a is fixedly connected with the sealing member 40, and the other is in abutment with the sealing member 40. For example, the extension portion 2 is fixedly connected with the sealing member 40, and the electrode terminal 20 is in abutment with the sealing member 40. When the battery cell 110 is deformed by swelling, the deformation amount of the extension portion 2 is smaller than that of the electrode terminal 20 and the main body portion 1, and an exhaust passage is formed between the electrode terminal 20 and the sealing member 40 to exhaust the gas in the battery cell 110, so as to reduce or even eliminate the deformation amount of the battery cell 110 by swelling. Alternatively, the extension portion 2 is in abutment with the sealing member 40, and the sealing member 40 is fixedly connected with the electrode terminal 20. When the battery cell 110 is deformed by swelling, the deformation amount of the extension portion 2 is smaller than that of the electrode terminal 20 and the main body portion 1, and an exhaust passage is formed between the extension portion 2 and the sealing member 40 to exhaust the gas in the battery cell 110, so as to reduce or even eliminate the deformation amount of the battery cell 110 by swelling. Alternatively, the sealing member 40 can also be in abutment with both the electrode terminal 20 and the first wall portion 10a.

[0130] In the thickness direction Z of the first wall portion 10a, at least part of the sealing member 40 is arranged between the extension portion 2 and the first terminal portion 21. It can be understood that, in the thickness direction Z, the extension portion 2, at least part of the sealing member 40, and the first terminal portion 21 are sequentially arranged in layers. In some examples, in the thickness direction Z of the first wall portion 10a, the entire structure of the sealing member 40 is arranged between the extension portion 2 and the first terminal portion 21. In other examples, in the thickness direction Z of the first wall portion 10a, a structure of the sealing member 40 is arranged between the extension portion 2 and the first terminal portion 21.

[0131] The battery cell 110 provided by the embodiments of the present application can be deformed by swelling. When the battery cell 110 is deformed by swelling, the first wall portion 10a and the electrode terminal 20 are deformed in a direction away from the inside of the battery cell 110. Due to the connection between the electrode terminal 20 and the main body portion 1, the deformation amount of the electrode terminal 20 and the main body portion 1 is greater than that of the extension portion 2 under the influence of internal load, working temperature, and other factors. Therefore, when the battery cell 110 is deformed by swelling, the extension portion 2 and the sealing member or the electrode terminal 20 are separated, an exhaust passage is formed, and the gas is exhausted, so as to reduce the possibility of accumulation of gas in the battery cell 110, improve the overall pressure relief range and pressure relief elasticity of the battery cell 110, improve the service life of the battery cell 110, and improve the reliability of the battery cell 110.

[0132] As Figure 4 , Figure 5 , Figure 7 and Figure 8As shown in some optional embodiments, in the thickness direction Z of the first wall portion 10a, the extension 2 and the seal 40 are both provided with interfitting structures, the interfitting structures on the extension 2 and the interfitting structures on the seal 40 can make the extension 2 and the seal 40 tightly combined together to form a stable whole, so as to realize the sealing between the electrode terminal 20 and the first wall portion 10a, improve the sealing of the battery monomer 110, and when subjected to the internal expansion force of the battery monomer 110, the interfitting structures can also be separated to form an exhaust passage, and after the exhaust is completed, the interfitting structures are embedded together again under the internal load of the shell 10 and the electrode terminal 20 to realize the resealing between the electrode terminal 20 and the first wall portion 10a, thereby improving the service life of the battery monomer 110.

[0133] As shown in some optional embodiments, the extension 2 includes a first portion 2a and a second portion 2b, the first portion 2a is connected to the second portion 2b away from one end of the main body portion 1, and the second portion 2b protrudes from the first portion 2a in a direction away from the electrode assembly 30. The seal 40 includes a first recess 44, at least part of the second portion 2b is arranged in the first recess 44, and the second portion 2b and the recess form interfitting structures. Figure 4 Figure 5 Figure 7 As shown in some optional embodiments, the extension 2 includes a first portion 2a and a second portion 2b, the first portion 2a is connected to the second portion 2b away from one end of the main body portion 1, and the second portion 2b protrudes from the first portion 2a in a direction away from the electrode assembly 30. The seal 40 includes a first recess 44, at least part of the second portion 2b is arranged in the first recess 44, and the second portion 2b and the recess form interfitting structures. Figure 8 Optionally, the first portion 2a connects the second portion 2b to the main body portion 1.

[0134] Optionally, a plane in which a side surface of the first portion 2a away from the electrode assembly 30 is located is between a plane in which a side surface of the main body portion 1 away from the electrode assembly 30 is located and the electrode assembly 30.

[0135] Optionally, the second portion 2b can protrude from the main body portion 1 in a direction away from the electrode assembly 30, of course, it can also be lower than the main body portion 1.

[0136] Optionally, the number of the second portion 2b can include one or more.

[0137] Optionally, the number of the first recess 44 can be the same as the number of the second portion 2b, that is, the first recess 44 and the second portion 2b are arranged one by one.

[0138] Optionally, the number of the first recess 44 can also include one, and multiple second portions 2b are embedded into one first recess 44.

[0139] Optionally, a side surface of the second portion 2b away from the electrode assembly 30 can be in contact with a bottom surface of the first recess 44, of course, it can also be arranged without contact.

[0140] Optionally, a plane in which a side surface of the first portion 2a away from the electrode assembly 30 is located is between a plane in which a side surface of the main body portion 1 away from the electrode assembly 30 is located and the electrode assembly 30.

[0141] ​​The embodiments of the present application have the advantages that the mutual embedding structure on the extension 2 and the sealing member 40 is simplified, the manufacturing difficulty and assembly difficulty of the extension 2 and the sealing member 40 are reduced, and the manufacturing cost of the battery monomer 110 is improved.

[0142] As shown in Figure 4 , Figure 5 , Figure 7 and Figure 8 , in some optional embodiments, the sealing member 40 includes a first sealing part 41 and a second sealing part 42, the first sealing part 41 is connected to the second sealing part 42 near one end of the main body part 1, the first sealing part 41 is provided with a first recess 44, and the second sealing part 42 protrudes from the first sealing part 41 in the direction towards the electrode assembly 30. The first part 2a is provided with a second recess 2d, at least part of the second sealing part 42 is arranged in the second recess 2d, and the second sealing part 42 and the second recess 2d form a mutual embedding structure.

[0143] Optionally, the first sealing part 41 and the second sealing part 42 can be an integral structure.

[0144] The first sealing part 41 is provided with the first recess 44, and the first recess 44 can be recessed from the side surface of the first sealing part 41 towards the electrode assembly 30.

[0145] Optionally, the side surface of the first sealing part 41 away from the electrode assembly 30 and the side surface of the main body part 1 away from the electrode assembly 30 can be flushly arranged.

[0146] The second sealing part 42 protrudes from the first sealing part 41 in the direction towards the electrode assembly 30, which can be understood as that the plane where the side surface of the second sealing part 42 towards the electrode assembly 30 is located is between the side surface of the first sealing part 41 towards the electrode assembly 30 and the electrode assembly 30.

[0147] Optionally, the number of the second sealing part 42 can include one or more.

[0148] Optionally, the number of the second recess 2d can be the same as the number of the second sealing part 42, that is, the second recess 2d and the second sealing part 42 are arranged one by one.

[0149] Optionally, the number of the second recess 2d can also include one, and multiple second sealing parts 42 are embedded into one second recess 2d.

[0150] Optionally, the side surface of the second sealing part 42 towards the electrode assembly 30 can be in contact with the bottom surface of the second recess 2d, of course, it can also be arranged without contact.

[0151] The embodiment of the present application has the advantages that the contact area between the sealing member 40 and the extension part 2 is further increased, the sealing performance of the sealing member 40 and the extension part is improved, and the reliability of the battery monomer 110 is improved.

[0152] As shown in Figure 4 , Figure 5 , Figure 7 and Figure 8 , in some optional embodiments, the sealing member 40 further comprises a third sealing part 43, at least part of the third sealing part 43 is accommodated in the electrode lead-out hole 3.

[0153] Optionally, the surface of the first sealing part 41 can also be flat, and the first concave part 44 is formed between the third sealing part 43 and the second sealing part 42.

[0154] Optionally, the first sealing part 41 connects the second sealing part 42 and the third sealing part 43.

[0155] In some examples, the entire structure of the third sealing part 43 is accommodated in the electrode lead-out hole 3. In other examples, part of the structure of the third sealing part 43 is located in the electrode lead-out hole 3, and the other part of the structure of the third sealing part 43 is located in the inside of the shell 10.

[0156] The embodiment of the present application has the advantages that the sealing area between the electrode terminal 20 and the first wall part 10a is increased, the possibility of internal short circuit of the battery monomer 110 caused by the electrical connection between the extension part 2 and the electrode terminal 20 is reduced, and the reliability of the battery monomer 110 is improved.

[0157] As shown in Figure 4 , Figure 5 , Figure 7 and Figure 8 , in some optional embodiments, the extension part 2 further comprises a third part 2c, the third part 2c connects the main body part 1 and the first part 2a, and at least one of the first part 2a and the main body part 1 is arranged to be bent relative to the third part 2c.

[0158] In some examples, the first part 2a is arranged to be bent relative to the third part 2c, and the main body part 1 is arranged to be bent relative to the third part 2c, for example, the first part 2a, the third part 2c and the main body part 1 form a Z-shaped structure. In other examples, the first part 2a is arranged to be bent relative to the third part 2c. In yet other examples, the main body part 1 is arranged to be bent relative to the third part 2c.

[0159] Optionally, both the first part 2a and the main body 1 are bent relative to the third part 2c, and the distance between the first part 2a and the main body 1 is L, where 0 mm < L ≤ 7 mm. The distance between the first part 2a and the main body 1 can be understood as the distance between the surface of the first part 2a facing the electrode assembly 30 and the surface of the main body 1 facing the electrode assembly 30, when the thicknesses of the first part 2a and the main body 1 are the same. Optionally, the distance between the first part 2a and the main body 1 can be 0.1 mm, 0.2 mm, 0.5 mm, 1 mm, 2 mm, 4 mm, 6 mm, or 7 mm.

[0160] In this embodiment, by setting a third part 2c to bend the first part 2a and the second part 2b into the battery cell 110, it is beneficial to adjust the distance between the electrode terminal 20 and the connection area of ​​the main body 1 and the extension 2, further increasing the difference in the expansion deformation of the electrode terminal 20 and the main body 1 and the expansion deformation of the extension 2, thereby facilitating the adjustment of the pressure threshold required when the exhaust channel between the electrode terminal 20 and the extension 2 is opened, and improving the applicability of the battery cell 110.

[0161] like Figure 4 , Figure 5 , Figure 7 as well as Figure 8 As shown, in some optional embodiments, the plane of the side surface of the extension 2 facing away from the electrode assembly 30 is located between the plane of the side surface of the first wall portion 10a facing away from the electrode assembly 30 and the electrode assembly 30, so as to increase the distance between the connection area between the electrode terminal 20 and the main body portion 1 and the extension 2, further increasing the difference in the expansion deformation of the electrode terminal 20 and the main body portion 1 and the expansion deformation of the extension 2, thereby facilitating the adjustment of the pressure threshold required when the exhaust channel between the electrode terminal 20 and the extension 2 is opened, and improving the applicability of the battery cell 110.

[0162] Optionally, the entire structure of the extension 2 protrudes from the main body 1 in the direction toward the electrode assembly 30.

[0163] like Figure 4 to Figure 8 As shown, in some optional embodiments, the distance between the side surface of the extension 2 facing the electrode assembly 30 and the side surface of the first wall portion 10a facing the electrode assembly 30 is L, and the thickness of the first wall portion 10a is h. L and h satisfy the relationship: 0 < L / h ≤ 6.

[0164] For example, the ratio of the distance between the side surface of the extension 2 facing away from the electrode assembly 30 and the side surface of the first wall portion 10a facing away from the electrode assembly 30 to the thickness of the first wall portion 10a can be 0.1, 0.2, 0.3, 0.5, 1, 2, 2.1, 2.5, 3, 4, 5 or 6.

[0165] The embodiment of the present application sets the ratio of the distance between the side surface of the extension 2 facing away from the electrode assembly 30 and the side surface of the first wall portion 10a facing away from the electrode assembly 30 and the thickness of the first wall portion 10a to be greater than 0, so that the extension 2 can receive the internal gas pressure of the battery monomer 110, and the adhesion of the electrode terminal 20 and the main body portion 1 is strengthened; the ratio of the distance between the side surface of the extension 2 facing away from the electrode assembly 30 and the side surface of the first wall portion 10a facing away from the electrode assembly 30 and the thickness of the first wall portion 10a is set to be less than or equal to 6, so as to reduce the possibility that the extension 2 is bent or even the first wall portion 10a is deformed due to insufficient strength of the extension 2 itself, and reduce the possibility of interference between the extension 2 and other structural members in the electrode assembly 30 or the battery monomer 110. The assembly difficulty of the battery monomer 110 is reduced, and the reliability of the battery monomer 110 is improved.

[0166] As shown in Figure 4 to Figure 8 some optional embodiments, the first terminal portion 21 includes a terminal main body portion 211 and a protrusion 212, the protrusion is arranged on the circumferential side of the terminal main body portion 211, and at least part of the sealing member 40 is located between the protrusion 212 and the extension 2 in the thickness direction Z of the first wall portion 10a.

[0167] Optionally, the size of the terminal main body portion 211 in the radial direction of the electrode lead-out hole 3 and the radial size of the electrode lead-out hole 3 can be the same, of course, they can also be different.

[0168] Optionally, the protrusion 212 can be located on the outside of the first wall portion 10a, and the protrusion 212 can be used to limit the movement of the first terminal portion 21 into the electrode lead-out hole 3.

[0169] Optionally, the projection shape of the protrusion 212 in the thickness direction Z of the first wall portion 10a can be a connected closed shape.

[0170] Optionally, the number of protrusions 212 can also include multiple, and multiple protrusions 212 are arranged at intervals along the circumferential side of the terminal main body portion 211.

[0171] Optionally, the protrusion 212 can be lapped on the extension 2, and in the thickness direction Z of the first wall portion 10a, the sealing member 40 is arranged between the protrusion 212 and the extension 2, which can seal the space between the protrusion 212 and the extension 2, and also can play the role of insulation between the protrusion 212 and the extension 2.

[0172] Optionally, the protrusion 212 can be a flange structure.

[0173] Optionally, the side of the protrusion 212 facing away from the electrode assembly 30 can be used to connect with the main body portion 1.

[0174] Optionally, the terminal main body portion 211 can be used to connect with the main body portion.

[0175] The application embodiment has the advantages that the sealing area of the sealing member 40 and the first terminal part 21 is increased, the overall size of the first terminal part 21 is reduced, the reliability of the battery monomer 110 is improved, and the overall volume of the battery monomer 110 is reduced.

[0176] As shown in Figure 4 to Figure 8 some optional embodiments, the convex part 212 has a size D along the thickness direction Z of the first wall part 10a, the thickness of the first wall part 10a is h, and D and h satisfy the relationship: 0.05≤D / h≤2.

[0177] For example, the ratio of the size of the convex part 212 along the thickness direction Z of the first wall part 10a to the thickness of the first wall part 10a is 0.05, 0.06, 0.07, 0.1, 0.15, 0.2, 0.5, 1, 1.5 or 2.

[0178] The application embodiment has the advantages that the ratio of the size of the convex part 212 along the thickness direction Z of the first wall part 10a to the thickness of the first wall part 10a is greater than or equal to 0.05, the expansion deformation amount of the electrode terminal 20 and the main body part 1 is increased, the opening of the exhaust passage of the battery monomer 110 during expansion is realized, the reliability of the battery monomer 110 is improved, the ratio of the size of the convex part 212 along the thickness direction Z of the first wall part 10a to the thickness of the first wall part 10a is less than or equal to 2, the rigidity of the convex part 212 itself is improved, the compression of the sealing member 40 does not fail, and the sealing between the convex part 212 and the sealing member 40 is improved.

[0179] Figure 9 is Figure 5 a magnification structure diagram.

[0180] As shown in Figure 4 to Figure 9 some optional embodiments, the electrode terminal 20 further includes a second terminal part 22, at least part of the second terminal part is accommodated in the electrode lead-out hole 3, and the second terminal part 22 is connected with the first terminal part 21.

[0181] The second terminal part 22 and the first terminal part 21 can be an integrally formed structure. Alternatively, the second terminal part 22 and the first terminal part 21 can also be independently formed and fixedly connected through welding, clamping, bonding or other ways.

[0182] The material of the second terminal part 22 and the first terminal part 21 can be the same or different.

[0183] Optionally, the second terminal part 22 can be electrically connected with the electrode assembly 30 through the adapter 60. Alternatively, the second terminal part 22 can also be directly electrically connected with the electrode assembly 30.

[0184] The first wall portion 10a can limit the second terminal portion 22 in the radial direction of the electrode lead-out hole 3, thereby fixing the electrode terminal 20 on the first wall portion 10a.

[0185] like Figure 4 , Figure 5 as well as Figure 9 As shown, in some optional embodiments, the second terminal portion 22 includes a first sub-portion 221 located within the electrode lead-out hole 3 and a second sub-portion 222 located outside the first wall portion 10a, the second sub-portion connecting the first sub-portion 221 and the first terminal portion 21. In the thickness direction Z of the first wall portion 10a, at least a portion of the second sub-portion 222 is located between the seal 40 and the first terminal portion 21.

[0186] Optionally, the second sub-part 222 is located on the side of the first sub-part 221 away from the electrode assembly 30.

[0187] In the thickness direction Z of the first wall portion 10a, at least a portion of the second sub-part 222 is located between the seal 40 and the first terminal portion 21. This can be understood as the second sub-part 222 being located outside the first wall portion 10a, and the first sub-part 221 being located inside the electrode lead-out hole 3. The radial dimension of the first sub-part 221 along the electrode lead-out hole 3 can be smaller than the radial dimension of the second sub-part 222 along the electrode lead-out hole 3. The fact that at least a portion of the second sub-part 222 is located between the seal 40 and the first terminal portion 21 increases the rigidity of the contact area between the electrode terminal 20 and the seal 40, improves the sealing performance between the electrode terminal 20 and the seal 40, and simultaneously increases the connection area between the first terminal portion 21 and the second terminal portion 22, thereby increasing the connection strength between the first terminal portion 21 and the second terminal portion 22. Optionally, at least a portion of the second sub-part 222 is located between the seal 40 and the protrusion 212.

[0188] Optionally, the dimensions of the second sub-part 222 along the radial direction of the electrode lead-out hole 3 and the dimensions of the protrusion 212 along the radial direction of the electrode lead-out hole 3 can be the same or different.

[0189] like Figure 4 to Figure 8 As shown, in some optional embodiments, the first terminal portion 21 has a radial dimension of d along the electrode lead-out hole 3, and the thickness of the first wall portion 10a is h. d and h satisfy the relationship: 1≤d / h≤35.

[0190] For example, the ratio of the radial dimension of the first terminal portion 21 along the electrode lead-out hole 3 to the thickness of the first wall portion 10a is 1, 2, 3, 5, 10, 15, 20, 25, 30 or 35.

[0191] The embodiment of the present application sets the ratio of the size of the first terminal portion 21 along the radial direction of the electrode lead-out hole 3 and the thickness of the first wall portion 10a to be greater than or equal to 1, which is conducive to improving the overall rigidity of the first wall portion 10a and reducing the possibility that excessive deformation of the first wall portion will cause the strength of the electrode terminal 20 to decrease. The ratio of the size of the first terminal portion 21 along the radial direction of the electrode lead-out hole 3 and the thickness of the first wall portion 10a is set to be less than or equal to 35, which is conducive to improving the elastic deformation amount of the connection between the first wall portion 10a and the electrode terminal 20 while reducing the space occupied by the first wall portion 10a and improving the energy density of the battery monomer 110.

[0192] As shown in Figure 4 to Figure 8 In some optional embodiments, the size of the first terminal portion 21 along the radial direction of the electrode lead-out hole 3 is d, and 5mm≤d≤16mm.

[0193] For example, the size of the first terminal portion 21 along the radial direction of the electrode lead-out hole 3 is 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 13mm or 16mm.

[0194] The embodiment of the present application sets the size of the first terminal portion 21 along the radial direction of the electrode lead-out hole 3 to be greater than or equal to 5mm, which is conducive to improving the expansion deformation amount of the electrode terminal 20 and the main body portion 1 when the internal pressure of the battery monomer 110 is low, thereby reducing the pressure threshold for opening the exhaust passage between the electrode terminal 20 and the extension portion 2, reducing the possibility of gas accumulation inside the battery monomer 110, and improving the service life and reliability of the battery monomer 110. The size of the first terminal portion 21 along the radial direction of the electrode lead-out hole 3 is set to be less than or equal to 16mm, which is conducive to improving the rigidity of the electrode terminal 20 itself and improving the pressure range of the overall exhaust pressure of the battery monomer 110.

[0195] As shown in Figure 4 to Figure 9 In some optional embodiments, the shell 10 further includes a connecting piece 50, which is arranged on the outer side of the first wall portion 10a, and the electrode terminal 20 is connected to the main body portion 1 through the connecting piece 50.

[0196] Optionally, the connecting piece can include a fixing piece 51 and an insulating piece 52, the fixing piece can be fixedly connected with the main body portion 1, and the insulating piece 52 can fixedly connect the fixing piece 51 with the electrode terminal 20.

[0197] Optionally, the insulating piece 52 is arranged on the circumferential side of the first terminal portion 21. Further, the insulating piece 52 can be fixedly connected with at least one of the terminal main body portion 211 and the protruding portion 212 of the first terminal portion 21.

[0198] Optionally, the fixing piece 51 is arranged on the circumferential side of the insulating piece 52.

[0199] The electrode terminal 20 is connected to the first wall portion 10a through the connecting member 50, so that the position of the electrode terminal 20 in the thickness direction Z is limited, the connection structure of the electrode terminal 20 and the first wall portion 10a is simplified, and the preparation yield of the battery monomer 110 is improved.

[0200] As shown in Figure 4 to Figure 9 In some optional embodiments, the connecting member 50 includes an insulating member 52, and the surface of the insulating member is provided with a hydrophobic layer.

[0201] Optionally, the material of the hydrophobic layer can include one or more combinations of fluorine / silicon material, polyolefin, polycarbonate, polyamide, polyacrylonitrile, polyester, fluorine-free acrylate, and molten paraffin.

[0202] The insulating member 52 is arranged to reduce the possibility of electrical connection between the electrode terminal 20 and the first wall portion 10a, and the hydrophobic layer is arranged on the surface of the insulating member 52 to reduce the possibility of water vapor outside the battery monomer 110 entering the battery monomer 110 through the exhaust passage, thereby improving the reliability of the battery monomer.

[0203] As shown in Figure 4 to Figure 9 In some optional embodiments, the shell 10 includes a shell body 11 and an end cover 12, the shell body 11 has an opening, and the end cover 12 is connected to the shell body and covers the opening. The end cover 12 is the first wall portion 10a.

[0204] Compared with the shell body 11, the end cover generally has a larger thickness. Arranging the first electrode terminal 20 on the end cover 12 can improve the connection strength between the first electrode terminal and the end cover, improve the stability of the first electrode terminal 20, and reduce the risk of the first electrode terminal deviating.

[0205] In a second aspect, the embodiments of the present application provide a battery device 100, which includes the battery monomer 110 in any of the preceding embodiments.

[0206] In a third aspect, the embodiments of the present application provide a power consumption device, which includes the battery device 100 in any of the preceding embodiments, and the battery device is used to provide electric energy for the power consumption device.

[0207] According to some embodiments of the present application, please refer to Figure 4 to Figure 8The battery cell 110 includes a case 10, an electrode assembly 30, an electrode terminal 20, and a seal member 40. The case 10 includes a first wall portion 10a including a main body portion 1 and an extension portion 2 connected to each other, the extension portion 2 being provided on a peripheral side of the electrode lead-out hole 3, at least a part of the extension portion protruding from the main body portion 1 toward one side of the electrode assembly 30. The electrode terminal 20 is connected to the main body portion 1, and the electrode terminal 20 is electrically connected to the electrode assembly 30, the electrode terminal including a first terminal portion 21 located outside the first wall portion 10a, a part of the electrode terminal 20 being located in the electrode lead-out hole 3. The seal member 40 is provided at least in part between the extension portion 2 and the first terminal portion 21 in a thickness direction Z of the first wall portion 10a.

[0208] The extension portion includes a first portion 2a and a second portion 2b, the first portion 2a being connected to the second portion 2b at an end thereof away from the main body portion 1, the second portion 2b protruding from the first portion 2a in a direction away from the electrode assembly 30. The seal member 40 includes a first recess portion 44, at least a part of the second portion 2b being provided in the first recess portion 44, the second portion 2b and the recess portion forming a mutually fitting structure. The seal member 40 includes a first seal portion 41 and a second seal portion 42, the first seal portion 41 being connected to the second seal portion 42 at an end thereof near the main body portion 1, the first seal portion 41 being provided with the first recess portion 44, the second seal portion 42 protruding from the first seal portion 41 in a direction toward the electrode assembly 30. The first portion 2a is provided with a second recess portion 2d, at least a part of the second seal portion 42 being provided in the second recess portion 2d, the second seal portion 42 and the second recess portion 2d forming a mutually fitting structure. The extension portion 2 further includes a third portion 2c, the third portion 2c being connected to the main body portion 1 and the first portion 2a, at least one of the first portion 2a and the main body portion 1 being bent with respect to the third portion 2c.

[0209] A plane in which a side surface of the extension portion 2 facing away from the electrode assembly 30 is located is positioned between a plane in which a side surface of the first wall portion 10a facing away from the electrode assembly 30 is located and the electrode assembly 30. The first terminal portion 21 includes a terminal main body portion 211 and a protrusion portion 212, the protrusion portion 212 being provided on a peripheral side of the terminal main body portion 211, at least a part of the seal member 40 being located between the protrusion portion 212 and the extension portion 2 in the thickness direction Z of the first wall portion 10a.

[0210] The electrode terminal 20 further includes a second terminal portion 22, at least a part of the second terminal portion 22 being accommodated in the electrode lead-out hole 3, the second terminal portion 22 being connected to the first terminal portion 21. The second terminal portion includes a first sub-portion 221 located in the electrode lead-out hole 3 and a second sub-portion 222 located outside the first wall portion 10a, the second sub-portion 222 being connected to the first sub-portion 221 and the first terminal portion 21. At least a part of the second sub-portion 222 is located between the seal member 40 and the first terminal portion 21 in the thickness direction Z of the first wall portion 10a.

[0211] The housing 10 further includes a connecting member 50 provided on the outer side of the first wall portion 10a, and the electrode terminal 20 is connected to the main body portion 1 via the connecting member 50. The connecting member includes an insulating member 52, and the surface of the insulating member is provided with a water repellent layer.

[0212] The housing 10 includes a case 11 having an opening and a lid 12 connected to the case and closing the opening. The lid is the first wall portion 10a.

[0213] Finally, it should be noted that the above-described embodiments are merely intended to illustrate the technical solutions of the present application, and are not intended to limit the present application; even though the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above-described embodiments, or make equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and the specification 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 manner. 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: Electrode assembly; The housing includes a first wall portion, the first wall portion including a connected main body portion and an extension portion and an electrode lead-out hole, the extension portion being disposed on the periphery of the electrode lead-out hole, and at least a portion of the extension portion protruding from the side of the main body portion facing the electrode assembly; An electrode terminal is connected to the main body portion and is electrically connected to the electrode assembly. The electrode terminal includes a first terminal portion located outside the first wall portion, and a portion of the electrode terminal is located within the electrode lead-out hole. A seal, in the thickness direction of the first wall portion, at least a portion of the seal is disposed between the extension portion and the first terminal portion.

2. The battery cell according to claim 1, characterized in that, In the thickness direction of the first wall portion, both the extension and the seal have a mutually interlocking structure.

3. The battery cell according to claim 2, characterized in that, The extension includes a first portion and a second portion, wherein the first portion is connected to the second portion at one end away from the main body, and the second portion protrudes from the first portion in a direction away from the electrode assembly; The seal includes a first recess, at least a portion of the second portion is disposed within the first recess, and the second portion and the recess form the interlocking structure.

4. The battery cell according to claim 3, characterized in that, The sealing element includes a first sealing portion and a second sealing portion. The first sealing portion is connected to the second sealing portion at one end near the main body. The first sealing portion is provided with a first recess. The second sealing portion protrudes from the first sealing portion in the direction toward the electrode assembly. The first part has a second recess, and at least a portion of the second sealing part is disposed in the second recess, the second sealing part and the second recess forming the interlocking structure.

5. The battery cell according to claim 3, characterized in that, The seal also includes a third sealing portion, at least a portion of which is accommodated within the electrode lead-out hole.

6. The battery cell according to claim 3, characterized in that, The extension further includes a third portion, which connects the main body and the first portion, wherein at least one of the first portion and the main body is bent relative to the third portion.

7. The battery cell according to claim 1, characterized in that, The plane containing the side surface of the extension facing away from the electrode assembly is located between the plane containing the side surface of the first wall facing away from the electrode assembly and the electrode assembly.

8. The battery cell according to claim 7, characterized in that, The distance between the side surface of the extension facing the electrode assembly and the side surface of the first wall facing the electrode assembly is L, and the thickness of the first wall is h. L and h satisfy the relationship: 0 < L / h ≤ 6.

9. The battery cell according to claim 1, characterized in that, The first terminal portion includes a terminal body portion and a protrusion portion. The protrusion portion is disposed on the periphery of the terminal body portion. In the thickness direction of the first wall portion, at least a portion of the seal is located between the protrusion portion and the extension portion.

10. The battery cell according to claim 9, characterized in that, The dimension of the protrusion along the thickness direction of the first wall is D, and the thickness of the first wall is h. D and h satisfy the relationship: 0.05≤D / h≤2.

11. The battery cell according to claim 1, characterized in that, The electrode terminal further includes a second terminal portion, at least a portion of which is accommodated in the electrode lead-out hole, and the second terminal portion is connected to the first terminal portion.

12. The battery cell according to claim 11, characterized in that, The second terminal portion includes a first sub-portion located inside the electrode lead-out hole and a second sub-portion located outside the first wall portion, the second sub-portion connecting the first sub-portion and the first terminal portion; In the thickness direction of the first wall portion, at least a portion of the second sub-part is located between the seal and the first terminal portion.

13. The battery cell according to claim 1, characterized in that, The first terminal portion has a radial dimension d along the electrode lead-out hole, and the first wall portion has a thickness h. d and h satisfy the relationship: 1≤d / h≤35.

14. The battery cell according to claim 1, characterized in that, The radial dimension of the first terminal portion along the electrode lead-out hole is d, where 5mm≤d≤16mm.

15. The battery cell according to claim 1, characterized in that, The housing also includes a connector disposed on the outer side of the first wall portion, and the electrode terminals are connected to the main body portion through the connector.

16. The battery cell according to claim 15, characterized in that, The connector includes an insulating component, the surface of which is provided with a hydrophobic layer.

17. The battery cell according to claim 1, characterized in that, The housing includes a shell and an end cap, the shell having an opening, and the end cap being connected to the shell and covering the opening; The end cap is the first wall portion.

18. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 17.

19. An electrical appliance, characterized in that, Includes the battery device as described in claim 18, the battery device being used to provide electrical energy to the electrical device.

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