Battery cell, battery, and electric device

Abstract

The application provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a first shell wall, a pole and an insulating sealing structure. The first shell wall is formed with a mounting hole. The pole comprises a penetrating part penetrating the mounting hole and a first extension part connected with the penetrating part and extending in a direction away from the central axis of the mounting hole. The first extension part extends to the outside of the outer surface of the first shell wall or the inside of the inner surface of the first shell wall. The insulating sealing structure is matched between the pole and the first shell wall. The first extension part comprises a first segment and a second segment arranged in sequence in the direction away from the central axis of the mounting hole. The second segment is more tightly pressed against the insulating sealing structure than the first segment. The battery monomer is beneficial to improving the sealing reliability of the insulating sealing structure and the reliability of the battery monomer.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the power battery, as the power source, plays an irreplaceable and crucial role. The power battery comprises several individual battery cells; however, the reliability of these individual cells needs improvement. Summary of the Invention

[0003] This application provides a battery cell, a battery, and an electrical device that can improve the reliability of the battery cell.

[0004] In a first aspect, embodiments of this application provide a battery cell, including: a first shell wall, a terminal post, and an insulating sealing structure. The first shell wall has a mounting hole. The terminal post includes a through portion passing through the mounting hole and a first extension portion connected to the through portion and extending relative to the through portion in a direction away from the central axis of the mounting hole. The first extension portion extends to the outer side of the outer surface or the inner side of the inner surface of the first shell wall. The insulating sealing structure is fitted between the terminal post and the first shell wall. The first extension portion includes a first segment and a second segment sequentially arranged along the direction away from the central axis of the mounting hole, and the second segment has a greater degree of compression on the insulating sealing structure than the first segment.

[0005] In the above technical solution, the second section is configured to have a greater degree of compression on the insulating and sealing structure than the first section. In this way, when the second section on the outside of the first section is raised due to welding or other factors, the problem of insufficient compression on the insulating and sealing structure caused by the second section being raised can be improved because the second section has a greater degree of compression on the insulating and sealing structure than the first section. This improves the sealing reliability between the terminal and the casing and enhances the reliability of the battery cell.

[0006] In some embodiments, the compression of the insulating sealing structure by the second segment is greater than the compression of the insulating sealing structure by the first segment.

[0007] In the above technical solution, since the second section has a larger compression amount on the insulating and sealing structure compared to the first section, when the compression amount of the first section on the insulating and sealing structure meets the requirements, the compression amount of the second section on the insulating and sealing structure has a compression margin, so that the second section has a greater degree of compression on the insulating and sealing structure compared to the first section. In this way, when the second section is raised, the compression margin can make up for the compression loss caused by the raising of the second section, so that the compression amount of the raised second section on the insulating and sealing structure still meets the compression requirements, thereby improving the sealing performance between the shell and the terminal, improving the leakage problem, and improving the reliability of the battery cell.

[0008] In some embodiments, the surface of the first segment near the first shell wall is the first surface, and the surface of the second segment near the first shell wall is the second surface, with the second surface protruding relative to the first surface toward the direction of the first shell wall.

[0009] In the above technical solution, by protruding the second section towards the first shell wall, it is easy to achieve a larger compression amount of the second section relative to the first section on the insulating sealing structure. This allows for a certain compression margin. Thus, when the second section tilts up relative to the first section with a relatively large tilt, the compression margin can offset the compression loss caused by the tilt, ensuring that the compression amount of the second section on the insulating sealing structure is still sufficient to maintain sealing. This improves the problem of poor sealing between the shell and the electrode caused by the tilt of the second section. And / or by protruding towards the first shell wall to increase the thickness of the second section, it is easy to achieve a larger mass per unit area for the second section relative to the first section. This increases the difficulty of tilting the second section, thereby reducing the tilt amplitude and improving the problem of poor sealing between the electrode and the shell due to insufficient compression of the insulating sealing structure caused by a large tilt amplitude of the second section.

[0010] In some embodiments, the first surface extends at an angle toward the first shell wall along a direction away from the central axis of the mounting hole.

[0011] The above technical solution can improve the problem of large steps forming at the connection between the first surface of the first segment and the second surface of the second segment, and improve the cracking problem caused by large deformation, thereby improving the structural reliability of the first extension.

[0012] In some embodiments, the first surface and the second surface are connected by a line or by a chamfer.

[0013] In the above technical solution, no step is formed at the connection between the first surface and the second surface. This can improve the problem of cracking of the first extension at the connection and improve the problem of stress concentration and cracking of the insulating sealing structure at the corresponding connection, thereby protecting the insulating sealing structure.

[0014] In some embodiments, the thickness of the second segment in the axial direction of the mounting hole is greater than the thickness of the first segment in the axial direction of the mounting hole.

[0015] In the above technical solution, by increasing the thickness of the second section and limiting the direction of the thickening of the second section to the direction towards the first shell wall, it is possible to achieve a greater compression of the insulation and sealing structure by the second section, so as to reserve a certain compression margin to compensate for the compression loss caused by at least part of the second section warping. At the same time, it is also possible to increase the difficulty of warping the second section by increasing the mass of the second section, thereby reducing the warping amplitude of the second section, so as to improve the problem of insufficient compression of the insulation and sealing structure caused by the warping of the second section, thereby improving the sealing performance between the pole and the shell.

[0016] In some embodiments, the surface of the second segment away from the first shell wall is flush with the surface of the first segment away from the first shell wall.

[0017] The above technical solution simplifies the structure and processing of the first extension.

[0018] In some embodiments, at least half of the extension dimension of the first extension in the direction away from the central axis of the mounting hole is engaged with the first shell wall stop.

[0019] In the above technical solution, the first extension can have a longer length to fit against the first shell wall, thereby effectively compressing the insulating sealing structure and improving the reliability of the seal.

[0020] In some embodiments, the pole post further includes a second extension connected to the through portion and extending relative to the through portion in a direction away from the central axis of the mounting hole. The second extension and the first extension extend to the inner and outer sides of the first housing wall, respectively. The insulating sealing structure includes a first insulating seal at least partially disposed between the first extension and the first housing wall, and a second insulating seal at least partially disposed between the second extension and the first housing wall. The material hardness of the first insulating seal is greater than that of the second insulating seal.

[0021] In the above technical solution, the clamping force applied to the first insulating seal by the first extension can be well transmitted to the second insulating seal, so that the second insulating seal can be well compressed, and the compression amount of the first insulating seal can be less than the compression amount of the second insulating seal, so that both the first insulating seal and the second insulating seal can achieve a good sealing effect.

[0022] In some embodiments, the shape of the side surface of the first insulating seal away from the first housing wall matches the shape of the side surface of the first extension facing the first housing wall.

[0023] In the above technical solution, the contact area between the first insulating seal and the first extension can be increased, reducing the cracking problem of the first insulating seal caused by local force concentration. Moreover, when the second section protrudes relative to the first section towards the first shell wall, the shape matching can make the first extension and the first insulating seal form a concave-convex fit, which plays a limiting role. During the vibration and impact of the battery cell, it is beneficial to improve the problem of the first insulating seal moving and loosening, improve the installation stability of the first insulating seal, and make the first insulating seal achieve a more reliable insulating and sealing effect.

[0024] In some embodiments, the electrode post includes an electrode post body and an electrode post cover plate. The electrode post body includes a first extension and a second extension. The first extension extends to the outer side of the outer surface of the first shell wall. The electrode post cover plate covers the outer side of the electrode post body, and the electrode post body and the electrode post cover plate are welded together.

[0025] In the above technical solution, by covering the outside of the pole body with the pole cover plate, the pole cover plate is positioned closer to the first extension than the second extension. The heat generated by welding the pole cover plate and the pole body is conducted to the first insulating seal more than the second insulating seal. Since the material hardness of the first insulating seal is greater than that of the second insulating seal, the heat resistance of the first insulating seal is stronger than that of the second insulating seal. For example, the first insulating seal is made of plastic and the second insulating seal is made of rubber. Thus, when welding the pole body and the pole cover plate, the thermal impact on the second insulating seal can be minimized, thereby improving the sealing reliability between the first shell wall and the pole.

[0026] In some embodiments, the first extension protrudes outward from the through portion toward the outside of the first shell wall to define a groove between the first extension and the through portion, the edge of the pole cover plate is disposed in the groove and is welded through to the through portion, and the welded structure formed by the welding is spaced apart from the first extension.

[0027] In the above technical solution, the shrinkage stress generated by the solidification of the weld pool can be blocked by the aforementioned interval, making it difficult or less likely to be transmitted to the first extension. This improves the warping problem of the first extension, allowing it to press against the insulating and sealing structure and enhance the insulation and sealing effect. Moreover, since the edge of the pole cover plate is set in the groove and welded to the through part rather than butt-welded to the first extension, there is no need to ensure a small assembly gap between the edge of the pole cover plate and the first extension to meet the butt-welding requirements. This allows for a larger gap between the edge of the pole cover plate and the first extension, thereby improving the compatibility of the pole body and reducing the machining precision required for the pole cover plate and pole body.

[0028] In some embodiments, the pole post is formed into a first extension by flanging and riveting.

[0029] In the above technical solution, the electrode post is easy to process and helps to improve the connection reliability between the first extension and the through part, and improve the assembly reliability between the electrode post and the first shell wall. For example, before the first extension is riveted, the first extension can be set with a structure in which the outer surface of the unsupported part protrudes relatively. After the first extension is flanged and riveted, the third surface of the obtained first section is flush with the fourth surface of the second section, and the second surface of the second section protrudes relative to the first surface of the first section towards the first shell wall. In this way, while flanged and riveted, the compression amount of the second section relative to the first section on the insulating sealing structure can be large. Therefore, it is easy to obtain the compression allowance of the corresponding second section and improve the sealing problem caused by the warping of the second section.

[0030] In some embodiments, the mass per unit area of ​​the second segment is greater than the mass per unit area relative to the first segment.

[0031] In the above technical solution, because the second segment has a larger mass per unit area compared to the first segment, it is more difficult for the second segment to bend up compared to the first segment. This results in a greater degree of compression of the insulating sealing structure by the second segment compared to the first segment. This reduces the degree of bending of the second segment to some extent, mitigating the problem of poor sealing between the terminal and the casing due to insufficient compression of the insulating sealing structure caused by a larger bending amplitude. This improves the sealing performance between the casing and the terminal, reduces leakage, and enhances the reliability of the battery cell. Furthermore, by setting the second segment to have a larger mass per unit area compared to the first segment, it is easier to achieve a larger compression amount of the insulating sealing structure. This not only compensates for the compression loss caused by the bending of the second segment using the compression allowance but also reduces the bending amplitude of the second segment, thus more effectively improving the sealing performance between the casing and the terminal, reducing leakage, and enhancing the reliability of the battery cell.

[0032] In some embodiments, the thickness of the second segment is greater than the thickness of the first segment; and / or, the density of the second segment is greater than the density of the first segment.

[0033] In the above technical solution, by setting the thickness and density of the second segment to be greater than that of the first segment, it is easy to achieve a larger mass per unit area for the second segment compared to the first segment, thereby reducing the structural complexity of the first extension and reducing the design and processing difficulty of the first extension.

[0034] In some embodiments, a receiving cavity is formed on the inner side of the first housing wall of the battery cell, and the electrode post includes an electrode post body. A receiving groove is formed on the electrode post body in a direction that opens away from the receiving cavity. The electrode post body has a connecting hole that penetrates the groove wall of the receiving groove on the side near the receiving cavity and connects the receiving cavity and the receiving groove.

[0035] In the above technical solution, when electrolyte is injected into a battery cell, the electrolyte can be injected into a receiving tank and then flow towards the receiving cavity through a connecting hole. The receiving tank acts as a buffer for the electrolyte, mitigating problems such as splashing and overflow. Furthermore, the sidewalls of the receiving tank can, to some extent, prevent electrolyte splashing, reducing external contamination and facilitating rapid electrolyte injection. Moreover, since there is no need to create a separate injection channel on the casing, no special processing of the casing is required, which helps reduce the structural complexity and manufacturing difficulty of the casing.

[0036] In some embodiments, the battery cell includes a cell assembly, the cell assembly including an active material coating portion housed in a receiving cavity, and a conductive portion connected to the active material coating portion, the conductive portion passing through a connecting hole to be at least partially housed in the receiving groove.

[0037] In the above technical solution, by housing at least a portion of the conductive part in the receiving groove, the conductive part occupies at least a portion of the space in the receiving groove, thereby reducing the space occupied by the conductive part in the receiving cavity and saving space in the receiving cavity to accommodate a larger volume of active material coating part, which is beneficial to improving the energy density of the battery cell, or, if the energy density of the battery cell remains unchanged, it is beneficial to reduce the size of the battery cell.

[0038] In some embodiments, the terminal post includes a terminal post cover plate covering the terminal post body, the terminal post cover plate having an injection hole that can communicate with a receiving groove, and the battery cell also includes a sealing structure for sealing the injection hole.

[0039] In the above technical solution, by machining the liquid injection hole on the electrode cover plate, the opening is relatively small and located on the outside, so that the liquid injection inlet can be reliably sealed through the sealing structure, thereby improving the working reliability of the battery cell and enabling flexible and diversified design of the sealing structure.

[0040] Secondly, embodiments of this application also provide a battery, including a battery cell of any of the above-described solutions.

[0041] In the above technical solution, the reliability of the battery cell according to the embodiment of this application is improved, which is beneficial to improving the performance of the battery.

[0042] Thirdly, embodiments of this application also provide an electrical device including a battery from any of the above-described solutions.

[0043] In the above technical solution, the improved battery performance is beneficial to enhancing the power consumption performance of the electrical device. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0046] Figure 2 Exploded views of the battery structure provided in some embodiments of this application;

[0047] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0048] Figure 4 A schematic diagram of the orthographic projection of a single battery cell provided in some embodiments of this application;

[0049] Figure 5 For along Figure 4 Sectional view of line AA in the middle;

[0050] Figure 6 for Figure 5 A magnified view of part B, shown in the center circle;

[0051] Figure 7 for Figure 6 A magnified view of part C, circled in the middle;

[0052] Figure 8 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0053] Figure 9 This application provides state diagrams of the poles before they are riveted, based on some embodiments of the present application.

[0054] Figure 10 These are diagrams showing the state of the pole post after it has been unriveted, provided in some embodiments of this application.

[0055] Figure 11 This is a schematic diagram illustrating the interaction between a battery cell and a busbar component according to some embodiments of this application.

[0056] Reference numerals: Vehicle 1000; First direction X; Second direction Y; Third direction Z; Battery 100; Controller 200; Motor 300; Housing 101; First housing body 1011; Second housing body 1012; Battery cell 102; Busbar component 103; Housing 1; Receiving cavity 11; Mounting hole 12; Central axis L; First housing wall 13; Second housing wall 14; Terminal post 2; Terminal post body 3; Recessed groove 31; First extension 32; First section 321; First surface 3211; Third surface 3212; Second section 322; Second surface 3221; Fourth surface 3222; Through section 33; Receiving groove 36; Connecting hole 37; Second extension 38; Support section 39; Terminal cover plate 4; Injection hole 43; Sealing structure 6; First seal 61; Second seal 62; Cell assembly 7; Active material coating section 71; Conductive section 72; Insulating sealing structure 8; First insulating seal 81; Second insulating seal 82; First part 821; Second part 822. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0059] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0060] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0061] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0062] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0063] In this application, "multiple" means two or more (including two).

[0064] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0065] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery module generally includes multiple battery cells. A battery pack generally includes a housing for encapsulating one or more battery cells or one or more battery modules. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0066] A battery cell includes a casing, a cell assembly, and an electrolyte. The casing houses the cell assembly and the electrolyte. The cell assembly includes at least one electrode assembly, which consists of a positive electrode, a negative electrode, and a separator. The electrode assembly can be a wound structure or a stacked structure, etc. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates.

[0067] A positive electrode typically includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated onto the positive current collector. The positive current collector without a positive active material layer protrudes from the one with a positive active material layer, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the material of the positive active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0068] A negative electrode typically includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated onto the negative current collector. The negative current collector without a negative active material layer protrudes from the negative current collector with a negative active material layer, and the negative current collector without a negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the material of the negative active material layer can be carbon or silicon, etc.

[0069] To ensure that the battery can withstand high currents without melting, multiple positive electrode tabs are stacked together to form the positive electrode tab portion, and multiple negative electrode tabs are stacked together to form the negative electrode tab portion. The housing has terminals; the positive electrode tabs are electrically connected to the positive electrode terminals, and the negative electrode tabs are electrically connected to the negative electrode terminals. For example, the tabs can be connected to the terminals to form a direct electrical connection between the tabs and the terminals. Alternatively, the battery cell assembly may include an adapter plate; the tabs are connected to the adapter plate, and the adapter plate is connected to the terminals to form an indirect electrical connection between the tabs and the terminals.

[0070] The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0071] In some battery cells of related technologies, the casing has terminals that are electrically connected to the cell assembly housed in the casing to achieve electrode output. An insulating and sealing structure is provided between the terminals and the casing. The terminals pass through the casing and include stop edges on both the inner and outer sides of the casing. Due to welding and other factors, these stop edges are prone to warping, and the closer the stop edges are to the edge, the greater the warping. This makes it less effective at compressing the insulating and sealing structure, resulting in insufficient compression of the insulating and sealing structure and affecting the sealing effect between the casing and the terminals.

[0072] Therefore, embodiments of this application propose a battery cell including a housing, a terminal post, and an insulating sealing structure. The housing includes a first housing wall with a mounting hole formed thereon. The terminal post includes a through portion passing through the mounting hole and a first extension portion connected to the through portion and extending in a direction away from the central axis of the mounting hole relative to the through portion. The first extension portion extends to the outer side of the outer surface or the inner side of the inner surface of the first housing wall. The insulating sealing structure is fitted between the terminal post and the first housing wall. The first extension portion includes a first section and a second section arranged sequentially along the direction away from the central axis of the mounting hole, and the second section has a greater degree of compression on the insulating sealing structure than the first section.

[0073] Therefore, by setting the second section to have a greater degree of compression on the insulation and sealing structure than the first section, when the second section on the outside of the first section is warped due to welding or other factors, the greater degree of compression on the insulation and sealing structure caused by the warping of the second section can improve the problem of insufficient compression on the insulation and sealing structure caused by the warping of the second section, thereby improving the sealing reliability between the terminal and the casing and improving the reliability of the battery cell.

[0074] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0075] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0076] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0077] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0078] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 101 and a plurality of battery cells 102, the battery cells 102 being housed within the housing 101. The housing 101 provides assembly space for the battery cells 102, and the housing 101 can adopt various structures. In some embodiments, the housing 101 may include a first housing body 1011 and a second housing body 1012, the first housing body 1011 and the second housing body 1012 overlapping each other, and the first housing body 1011 and the second housing body 1012 together define an assembly space for accommodating the battery cells 102. The second box body 1012 can be a hollow structure open at one end, and the first box body 1011 can be a plate-like structure. The first box body 1011 covers the open side of the second box body 1012, so that the first box body 1011 and the second box body 1012 together define the assembly space. Alternatively, the first box body 1011 and the second box body 1012 can both be hollow structures open on one side, with the open side of the first box body 1011 covering the open side of the second box body 1012. Of course, the box 101 formed by the first box body 1011 and the second box body 1012 can be of various shapes, such as a cylinder, a cuboid, etc.

[0079] In battery 100, multiple battery cells 102 can be connected in series, parallel, or in a hybrid configuration. A hybrid configuration means that multiple battery cells 102 are connected in both series and parallel configurations. Multiple battery cells 102 can be directly connected in series, parallel, or in a hybrid configuration, and then the entire assembly of the multiple battery cells 102 is housed within housing 101. Alternatively, battery 100 can also be composed of multiple battery cells 102 first connected in series, parallel, or in a hybrid configuration to form a battery module, and then multiple battery modules are connected in series, parallel, or in a hybrid configuration to form a whole, which is also housed within housing 101. Battery 100 may also include other structures; for example, battery 100 may also include a busbar component for electrically welding multiple battery cells 102.

[0080] Each battery cell 102 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 to these. The battery cell 102 can be cylindrical, flat, cuboid, etc. For example, see reference... Figure 3In the embodiment shown, the length direction of the battery cell 102 is the first direction X, the width direction of the battery cell 102 is the second direction Y, and the height direction of the battery cell 102 is the third direction Z. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other.

[0081] In some embodiments of this application, combined with Figures 3-6 The battery cell 102 includes a housing 1 and a terminal post 2, the terminal post 2 being disposed in the housing 1, and a receiving cavity 11 being formed inside the housing 1. Exemplarily, the battery cell 102 includes a cell assembly 7, which may include an active material coating portion 71 and a conductive portion 72 connected to the active material coating portion 71. The active material coating portion 71 is housed in the receiving cavity 11, and the conductive portion 72 is welded to the terminal post 2, such that the conductive portion 72 is electrically connected between the active material coating portion 71 and the terminal post 2.

[0082] Combination Figure 5 and Figure 6 The housing 1 includes a first housing wall 13, on which a mounting hole 12 is formed. The electrode post 2 passes through the mounting hole 12 and is mounted on the first housing wall 13. The electrode post 2 includes a through portion 33 and a first extension portion 32. The through portion 33 passes through the mounting hole 12, meaning at least a portion of the through portion 33 is located within the mounting hole 12. With the axial direction of the mounting hole 12 as the projection direction and a surface perpendicular to the axial direction of the mounting hole 12 as the projection surface, the projection of the through portion 33 on the projection surface falls within the projection range of the mounting hole 12 on the projection surface, thus enabling the through portion 33 to pass through the mounting hole 12. The type of electrode post 2 is not limited; it can be a cathode electrode post or an anode electrode post.

[0083] Combination Figure 5 and Figure 6 The first extension 32 is connected to the through portion 33 and extends in a direction away from the central axis L of the mounting hole 12 relative to the through portion 33. The first extension 32 extends to the outer side of the outer surface or the inner side of the inner surface of the first shell wall 13. The two surfaces of the first shell wall 13 in the wall thickness direction are the outer surface and the inner surface, respectively. The inner surface is the side of the first shell wall 13 facing the receiving cavity 11, and the outer surface is the side of the first shell wall 13 away from the receiving cavity 11. The side of the outer surface away from the receiving cavity 11 is the outer side of the outer surface, and the side of the inner surface facing the receiving cavity 11 is the inner side of the inner surface. "The first extension 32 extends to the outer side of the outer surface or the inner side of the inner surface of the first shell wall 13" means that at least a portion of the first extension 32 is directly opposite the first shell wall 13, with the axial direction of the mounting hole 12 as the projection direction and the plane perpendicular to the axial direction of the mounting hole 12 as the projection plane, the projection of the first extension 32 on the projection plane and the projection of the first shell wall 13 on the projection plane have an intersection area, and the portion of the first extension 32 corresponding to the intersection area is directly opposite the first shell wall 13.

[0084] Combination Figure 5 and Figure 6 The battery cell 102 also includes an insulating and sealing structure 8 that is fitted between the first housing wall 13 and the terminal post 2. That is, at least a part of the insulating and sealing structure 8 is sandwiched between the first housing wall 13 and the terminal post 2, so that the terminal post 2 and the first housing wall 13 are indirectly fitted through the insulating and sealing structure 8, thereby achieving insulation and sealing between the first housing wall 13 and the terminal post 2.

[0085] Combination Figure 6 and Figure 7 The first extension 32 includes a first segment 321 and a second segment 322 arranged sequentially along a direction away from the central axis L of the mounting hole 12. That is, the second segment 322 is disposed relative to the first segment 321 near the edge of the first extension 32. For example... Figure 7 The portion to the right of the auxiliary line M shown is the first segment 321, and the portion to the left of the auxiliary line M is the second segment 322.

[0086] For example, combined Figure 6 When the electrode post 2 includes the electrode post body 3 and the electrode post cover plate 4, and the edge of the electrode post cover plate 4 is welded to the first extension 32, the first extension 32 is prone to warping due to the welding, and the warping is more severe closer to the edge of the first extension 32. Alternatively, when the electrode post 2 is a single piece and is welded to the busbar component 103 provided on the electrode post 2, the first extension 32 is also prone to warping due to the welding, and the warping is more severe closer to the edge of the first extension 32. When the edge of the first extension 32 warps significantly, the edge of the first extension 32 cannot press the insulating sealing structure 8 tightly, resulting in insufficient compression of the insulating sealing structure 8 and affecting the sealing effect between the housing 1 and the electrode post 2.

[0087] To improve the above-mentioned technical problems, in the embodiments of this application, the second segment 322 is configured to have a greater degree of compression on the insulating sealing structure 8 than the first segment 321. In this way, when the second segment 322 on the outside of the first segment 321 is raised due to welding or other factors, the problem of insufficient compression on the insulating sealing structure 8 caused by the second segment 322 being raised can be improved because the second segment 322 has a greater degree of compression on the insulating sealing structure 8 than the first segment 321. This improves the sealing reliability between the electrode post 2 and the housing 1 and enhances the reliability of the battery cell 102.

[0088] It is worth noting that there are multiple ways to achieve the "greater degree of compression of the second segment 322 relative to the first segment 321 on the insulating sealing structure 8". For example, in some embodiments, the compression amount of the second segment 322 relative to the first segment 321 on the insulating sealing structure 8 is set to be greater, so as to achieve a greater degree of compression of the second segment 322 relative to the first segment 321 on the insulating sealing structure 8. Another example is that the mass of the second segment 322 relative to the first segment 321 per unit area is set to be greater, so as to achieve a greater degree of compression of the second segment 322 relative to the first segment 321 on the insulating sealing structure 8. Examples are given below.

[0089] In some embodiments, by setting the compression amount of the second segment 322 on the insulating sealing structure 8 to be greater than the compression amount of the first segment 321 on the insulating sealing structure 8, that is, by setting the compression amount of the second segment 322 on the insulating sealing structure 8 to be greater than that of the first segment 321, the degree of compression of the second segment 322 on the insulating sealing structure 8 is achieved relative to that of the first segment 321. For example Figure 6 and Figure 7 As shown, the insulating sealing structure 8 includes a first part 821 disposed opposite to the first section 321 along the axial direction of the mounting hole 12, and a second part 822 disposed opposite to the second section 322 along the axial direction of the mounting hole 12. When the compression amount of the second part 822 is greater than the compression amount of the first part 821, it can be understood that the compression amount of the second section 322 on the insulating sealing structure 8 is greater than that of the first section 321.

[0090] In this case, since the second section 322 has a larger compression amount on the insulating sealing structure 8 compared to the first section 321, when the compression amount of the corresponding part of the insulating sealing structure 8 (such as the first part 821) of the first section 321 meets the requirements, the compression amount of the corresponding part of the insulating sealing structure 8 (such as the second part 822) of the second section 322 has a compression margin, so that the second section 322 has a greater degree of compression on the insulating sealing structure 8 compared to the first section 321. In this way, when the second section 322 is raised, the compression margin can make up for the compression loss caused by the raising of the second section 322, so that the compression amount of the raised second section 322 on the insulating sealing structure 8 still meets the compression requirements, thereby improving the sealing performance between the shell 1 and the pole post 2, improving the leakage problem, and improving the reliability of the battery cell 102.

[0091] In some embodiments, the second segment 322 protrudes towards the first shell wall 13 relative to the first segment 321. That is, the side surface of the second segment 322 closest to the first shell wall 13 (i.e., the second surface 3221 of the second segment 322) is positioned close to the first shell wall 13 relative to the side surface of the first segment 321 closest to the first shell wall 13 (i.e., the first surface 3211 of the first segment 321). Therefore, by protruding the second segment 322 towards the first shell wall 13, it is easy to achieve a larger compression amount of the second segment 322 relative to the first segment 321 on the insulating sealing structure 8. This allows for a certain compression margin, so that when the second segment 322 tilts up, the compression margin can offset the compression loss caused by the tilting of the second segment 322, ensuring that the compression amount of the second segment 322 on the insulating sealing structure 8 is still sufficient to maintain the seal. This improves the problem of poor sealing between the shell 1 and the pole post 2 caused by the tilting of the second segment 322.

[0092] Of course, this application is not limited to this. For example, in other embodiments of this application, the second surface 3221 of the second segment 322 can be set to be flush with the first surface 3211 of the first segment 321. In this case, the insulating sealing structure 8 can be set such that, before assembly, the side surface of the second part 822 facing the second segment 322 protrudes relative to the side surface of the first part 821 facing the first segment 321. After assembly, the side surface of the second part 822 facing the second segment 322 is compressed to be flush with the side surface of the first part 821 facing the first segment 321, thereby indicating that the second part 822 has a greater degree of compression relative to the first part 821. In this case, the second segment 322 can also have a larger amount of compression on the insulating sealing structure 8 relative to the first segment 321. In this way, the second part 822 can also reserve a certain compression margin. When the second section 322 is raised, the compression margin can offset the compression loss caused by the second section 322 being raised, so that the compression of the second section 322 on the insulating sealing structure 8 is still sufficient to maintain the sealing performance. This can improve the problem of poor sealing performance between the housing 1 and the pole post 2 caused by the second section 322 being raised.

[0093] In some embodiments, such as Figure 6 and Figure 7As shown, the thickness W2 of the second segment 322 in the axial direction of the mounting hole 12 is greater than the thickness W1 of the first segment 321 in the axial direction of the mounting hole 12. For example, when the thickness of the second segment 322 increases in the direction closer to the first housing wall 13, the second segment 322 can protrude relative to the first segment 321 in the direction closer to the first housing wall 13. This makes it easier to achieve a larger compression amount of the second segment 322 relative to the first segment 321 on the insulating sealing structure 8, so as to reserve a certain compression margin to compensate for the compression loss caused by the warping of the second segment 322, thereby improving the problem of poor sealing between the housing 1 and the pole post 2 caused by the warping of the second segment 322. For example, when the direction of thickness increase of the second segment 322 is not limited, if the materials of the first segment 321 and the second segment 322 are the same or have similar densities, it is beneficial to achieve a larger mass of the second segment 322 per unit area relative to the first segment 321. This is beneficial to increase the difficulty of raising the second segment 322, thereby reducing the raising amplitude of the second segment 322 and improving the problem that the insulation sealing structure 8 cannot be pressed tightly due to the large raising amplitude of the second segment 322, resulting in poor sealing between the pole post 2 and the housing 1.

[0094] In some embodiments, such as Figure 6 and Figure 7 As shown, the surface of the first segment 321 closest to the first shell wall 13 (i.e., the first surface 3211 of the first segment 321) is constructed such that it extends obliquely toward the first shell wall 13 along the direction away from the central axis L of the mounting hole 12. Therefore, when the second segment 322 protrudes toward the first shell wall 13 relative to the first segment 321, the problem of a large step forming at the junction of the surface of the first segment 321 closest to the first shell wall 13 (i.e., the first surface 3211 of the first segment 321) and the surface of the second segment 322 closest to the first shell wall 13 (i.e., the second surface 3221 of the second segment 322) can be improved, thus mitigating cracking problems caused by large deformation and improving the structural reliability of the first extension 32.

[0095] In some embodiments, such as Figure 6 and Figure 7 As shown, the surface of the second section 322 near the first shell wall 13 (i.e., the second surface 3221 of the second section 322) is constructed to be parallel to the plane of the first shell wall 13, which facilitates processing and allows for better control of the compression of the insulating sealing structure 8, as well as improving the cracking problem of the insulating sealing structure 8.

[0096] In some embodiments, such as Figure 6 and Figure 7As shown, when the first surface 3211 extends obliquely along the direction away from the central axis L of the mounting hole 12 toward the direction closer to the first shell wall 13, the first surface 3211 and the second surface 3221 are connected by a line or by a chamfer (such as a rounded corner or a bevel). Therefore, no step is formed at the connection between the first surface 3211 and the second surface 3221, which on the one hand improves the problem of cracking of the first extension 32 at this connection, and on the other hand improves the problem of stress concentration and cracking of the insulating sealing structure 8 at the corresponding connection, thereby protecting the insulating sealing structure 8.

[0097] In some embodiments, when the second segment 322 protrudes relative to the first segment 321 toward the direction close to the first housing wall 13, the thickness W2 of the second segment 322 in the axial direction of the mounting hole 12 can be set to be greater than the thickness W1 of the first segment 321 in the axial direction of the mounting hole 12. Wherein, when the thickness is not a constant value, the average thickness can be used as the thickness.

[0098] Therefore, by increasing the thickness of the second section 322 and limiting the direction of the thickening of the second section 322 to the direction towards the first shell wall 13, it is possible to achieve a greater compression of the insulating sealing structure 8 by the second section 322, so as to reserve a certain compression margin to compensate for the compression loss caused by at least part of the second section 322 warping. At the same time, by increasing the mass of the second section 322, the difficulty of warping the second section 322 can be increased, thereby reducing the warping amplitude of the second section 322. This improves the problem of insufficient compression of the insulating sealing structure 8 caused by the warping of the second section 322, thereby improving the sealing performance between the pole post 2 and the shell 1.

[0099] For example, the side surface of the second segment 322 away from the first shell wall 13 (i.e., the fourth surface 3222 of the second segment 322) can be set to be flush with the side surface of the first segment 321 away from the first shell wall 13 (i.e., the third surface 3212 of the first segment 321). This not only simplifies the structure and processing of the first extension 32, for example, the third surface 3212 and the fourth surface 3222 of the first extension 32 processed by riveting are flush, but also makes it easy to set the thickness of the second segment 322 in the axial direction of the mounting hole 12 to be greater than the thickness of the first segment 321 in the axial direction of the mounting hole 12, and the second segment 322 protrudes relative to the first segment 321 toward the direction closer to the first shell wall 13.

[0100] Of course, this application is not limited to this. For example, in other embodiments of this application, the fourth surface 3222 of the second segment 322 may be configured to protrude from the third surface 3212 of the first segment 321 in a direction away from the first shell wall 13, or the fourth surface 3222 of the second segment 322 may be configured to be recessed into the third surface 3212 of the first segment 321 in a direction close to the first shell wall 13, so as to achieve that "the thickness of the second segment 322 in the axial direction of the mounting hole 12 is greater than the thickness of the first segment 321 in the axial direction of the mounting hole 12, and the second segment 322 protrudes relative to the first segment 321 in a direction close to the first shell wall 13".

[0101] In some embodiments, such as Figure 6 and Figure 7 As shown, at least half of the extension dimension of the first extension 32 in the direction away from the central axis L of the mounting hole 12 is engaged with the first shell wall 13. This engagement refers to indirect contact via the insulating sealing structure 8. Specifically, with the axial direction of the mounting hole 12 as the projection direction and the plane perpendicular to the axial direction of the mounting hole 12 as the projection plane, the projection of the first extension 32 on the projection plane intersects with the projection of the first shell wall 13 on the projection plane, and the portion of the first extension 32 corresponding to this intersection area engages with the first shell wall 13.

[0102] For example Figure 7 As shown, the radial dimension of the portion of the first extension 32 corresponding to the intersection area in the mounting hole 12 is L3, and the radial dimension of the first extension 32 in the mounting hole 12 is L0, where L3 ≥ L0 / 2 (e.g., Figure 7 (As shown). It is worth noting that the shape of the mounting hole 12 is not limited. For example, it can be circular, rectangular, elliptical, racetrack-shaped, etc. For non-circular mounting holes 12, the radial direction of the mounting hole 12 can include the width direction and the length direction of the mounting hole 12.

[0103] In short, by engaging at least half of the first extension 32 in the extending direction with the first shell wall 13, the first extension 32 can have a longer dimension to engage with the first shell wall 13, thereby more effectively pressing the insulating sealing structure 8 and improving the reliability of the seal.

[0104] In some embodiments, such as Figure 6 and Figure 7As shown, the extension dimension of the portion of the first extension 32 that abuts against the first shell wall 13 in the direction away from the central axis L of the mounting hole 12 is L3, and the wall thickness of the first shell wall 13 is D, where 0.5D≤L3≤2D. Thus, the dimension of the portion of the first extension 32 that abuts against the first shell wall 13 is close to or greater than the thickness of the first shell wall 13. Therefore, the first extension 32 can have a relatively long dimension to abut against the first shell wall 13, so as to more effectively compress the insulating sealing structure 8 and improve the reliability of the seal.

[0105] In some embodiments, such as Figure 6 and Figure 7 As shown, the first segment 321 extends by a dimension L1 in the direction away from the central axis L of the mounting hole 12, and the second segment 322 extends by a dimension L2 in the direction away from the central axis L of the mounting hole 12. The inclination of the first surface 3211 in the axial direction of the mounting hole 12 is H, wherein L2 is less than or equal to twice H, i.e., L2 ≤ 2H. Therefore, the deformation of the surface of the first extension 32 facing the insulating sealing structure 8 is relatively gentle, which can better constrain the cracking problem of the insulating sealing structure 8.

[0106] In some embodiments, such as Figure 6 and Figure 7 As shown, H ≤ L1 / 2, which prevents the inclination of the first surface 3211 from being too large. Due to the good structural reliability of the first segment 321, the second segment 322 and the through-hole 33 can be reliably connected, improving the pressing reliability of the first extension 32 on the insulating sealing structure 8. Moreover, the inclination angle of the first surface 3211 is not too large, which can reduce the local pressure on the insulating sealing structure 8 and improve the cracking problem of the insulating sealing structure 8.

[0107] In some embodiments, such as Figure 6 and Figure 7 As shown, L1 < L2, making the size of the second segment 322 relatively larger than that of the first segment 321. This makes the second segment 322 less prone to warping, allowing it to more easily press the insulating sealing structure 8 against the first segment 321. This increases the degree of compression of the insulating sealing structure 8 by the second segment 322, thus better addressing the problem of insufficient compression caused by warping of the second segment 322. Furthermore, because the size of the second segment 322 is larger than that of the first segment 321, a greater degree of compression by the second segment 322 against the insulating sealing structure 8 can reduce the pressure exerted by the second segment 322 on the insulating sealing structure 8, thereby mitigating the cracking problem of the insulating sealing structure 8.

[0108] In some embodiments, such as Figure 6and Figure 7 As shown, the radial dimension of the first extension 32 in the mounting hole 12 is L0, and the axial thickness of the second segment 322 in the mounting hole 12 is W2, where L0 ≥ 1 mm and W2 ≥ 0.5 mm. For example, L0 can be 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, or 2 mm, and W2 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm, etc. Therefore, the first extension 32 can have a relatively large extension dimension to construct the second segment 322, and the thickness dimension of the second segment 322 is relatively large. The second segment 322 can more effectively engage with the first shell wall 13 to more effectively compress the insulating sealing structure 8 and improve the reliability of the seal.

[0109] When the electrode body 3 is welded to the electrode cover plate 4, the weld shrinks after solidification, which can easily cause the edge of the first extension 32 to warp and deform, resulting in a reduction in the compression of the outer ring of the insulating sealing structure 8, leading to poor sealing and leakage. In some embodiments of this application, by defining the size and shape of the first extension 32 as described above, the first extension 32 is formed to be elongated in the direction away from the central axis L of the mounting hole 12, and the edge protrudes and thickens in the direction towards the first shell wall 13. This can increase the compression of the edge of the first extension 32 on the insulating sealing structure 8 and store a certain compression margin. When the edge of the first extension 32 warps due to welding, the compression margin can compensate for the compression lost due to the warping of the edge of the first extension 32, so that the compression of the insulating sealing structure 8 is still sufficient. This can solve the problem of poor sealing caused by insufficient compression of the sealing ring due to the large warping of the edge of the first extension 32 caused by the heat shrinkage of the weld solidification.

[0110] In some embodiments, such as Figure 6 and Figure 7 As shown, the pole post 2 also includes a second extension 38 connected to the through portion 33 and extending relative to the through portion 33 in a direction away from the central axis L of the mounting hole 12. The second extension 38 and the first extension 32 extend to the inner and outer sides of the first shell wall 13, respectively. That is, when the first extension 32 extends to the outer side of the outer surface of the first shell wall 13, the second extension 38 extends to the inner side of the inner surface of the first shell wall 13, and when the first extension 32 extends to the inner side of the inner surface of the first shell wall 13, the second extension 38 extends to the outer side of the outer surface of the first shell wall 13. The insulating sealing structure 8 includes a first insulating seal 81 at least partially disposed between the first extension 32 and the first shell wall 13, and a second insulating seal 82 at least partially disposed between the second extension 38 and the first shell wall 13. The first insulating seal 81 and the second insulating seal 82 are two parts, and the material hardness of the first insulating seal 81 is greater than that of the second insulating seal 82.

[0111] In this way, the clamping force applied by the first extension 32 to the first insulating seal 81 can be effectively transmitted to the second insulating seal 82, allowing the second insulating seal 82 to be compressed effectively. This ensures that the compression amount of the first insulating seal 81 is less than that of the second insulating seal 82, and both the first and second insulating seals 81 and 82 can achieve a good sealing effect. Furthermore, it is worth noting that when the insulating sealing structure 8 includes the first insulating seal 81 and the second insulating seal 82, the compression amount of the second segment 322 on the insulating sealing structure 8 is greater than that of the first segment 321. This can be understood as the second segment 322 exerting a greater compression amount on the second insulating seal 82 than the first segment 321.

[0112] In some embodiments, such as Figure 6 and Figure 7 As shown, when the material hardness of the first insulating seal 81 is greater than that of the second insulating seal 82, the surface of the first insulating seal 81 away from the first shell wall 13 is configured to match the shape of the surface of the first extension 32 facing the first shell wall 13. This increases the contact area between the first insulating seal 81 and the first extension 32, reducing the cracking problem caused by local force concentration. Moreover, when the second segment 322 protrudes relative to the first segment 321 towards the first shell wall 13, the shape matching allows the first extension 32 and the first insulating seal 81 to form a concave-convex fit, which serves as a limiting function. During the vibration and impact of the battery cell 102, this helps to improve the movement and loosening of the first insulating seal 81, ensuring that the first insulating seal 81 does not detach from the sealing fit position. This improves the stability of the first insulating seal 81, enabling it to achieve a more reliable insulating and sealing effect.

[0113] In some embodiments of this application, such as Figure 6 and Figure 7 As shown, the pole post 2 includes a pole post body 3 and a pole post cover plate 4. The pole post body 3 includes a first extension 32 and a second extension 38. The first extension 32 extends to the outer side of the outer surface of the first shell wall 13. The pole post cover plate 4 covers the outer side of the pole post body 3, and the pole post body 3 and the pole post cover plate 4 are welded together.

[0114] Therefore, by covering the outside of the pole body 3 with the pole cover plate 4, and positioning the pole cover plate 4 closer to the first extension 32 relative to the second extension 38, the heat generated by welding the pole cover plate 4 to the pole body 3 is conducted to the first insulating seal 81 more than the second insulating seal 82. Since the material hardness of the first insulating seal 81 is greater than that of the second insulating seal 82, the heat resistance of the first insulating seal 81 is stronger than that of the second insulating seal 82. For example, if the first insulating seal 81 is a plastic part and the second insulating seal 82 is a rubber part, the heat impact on the second insulating seal 82 can be minimized when welding the pole body 3 to the pole cover plate 4, thereby improving the sealing reliability between the first shell wall 13 and the pole 2.

[0115] In some embodiments of this application, such as Figure 8 As shown, the first extension 32 protrudes outward from the through portion 33 toward the outside of the first shell wall 13 to define a groove 31 between the first extension 32 and the through portion 33. The edge of the pole cover plate 4 is disposed in the groove 31 and is welded through to the through portion 33. The welded structure formed by the welding is spaced apart from the first extension 32.

[0116] Therefore, the shrinkage stress generated by the solidification of the weld pool can be blocked by the aforementioned interval, making it difficult or less likely to be transmitted to the first extension 32. This improves the warping problem of the first extension 32, allowing it to press tightly against the insulating sealing structure 8 and enhance the insulation sealing effect. Moreover, since the edge of the pole cover plate 4 is located within the groove 31 and is welded through the through part 33 rather than butt-welded to the first extension 32, there is no need to ensure a small assembly gap between the edge of the pole cover plate 4 and the first extension 32 to meet the butt-welding requirements. This allows for a larger gap between the edge of the pole cover plate 4 and the first extension 32, thereby improving the compatibility of the pole body 3 and reducing the machining precision required for the pole cover plate 4 and the pole body 3.

[0117] In some embodiments of this application, such as Figure 9 and Figure 10 As shown, the pole post 2 forms the first extension 32 by flanging and riveting, for example... Figure 9 The image shows the state of pole post 2 before it is riveted. Figure 10 This is the state after the pole post 2 is riveted. Specifically, after the pole post 2 is assembled to the mounting hole 12 through the through part 33, the first extension part 32 is made by using a flange riveting process. As a result, the pole post 2 is easy to process, and it is beneficial to improve the connection reliability between the first extension part 32 and the through part 33, and improve the assembly reliability between the pole post 2 and the first shell wall 13.

[0118] For example, before riveting, the first extension 32 can be configured as a structure with the outer surface of the outer end protruding relatively. After the first extension 32 is flanged and riveted, the third surface 3212 of the obtained first segment 321 is flush with the fourth surface 3222 of the second segment 322, and the second surface 3221 of the second segment 322 protrudes relative to the first surface 3211 of the first segment 321 towards the first shell wall 13. In this way, while flanged and riveted, the compression of the second segment 322 relative to the first segment 321 on the insulating sealing structure 8 can be large. Therefore, it is convenient for the insulating sealing structure 8 to obtain a compression margin at the corresponding second segment 322, and improve the sealing problem caused by the second segment 322 warping.

[0119] Of course, this application is not limited to this. For example, in other embodiments of this application, the pole post 2 can also be formed by welding two parts together, for example, by assembling the two parts separately into the mounting hole 12 and then welding the two parts together. It is understood that when the pole post 2 is assembled to the first housing wall 13 by means other than riveting, the phenomenon of extrusion of the insulating sealing structure 8 will also exist.

[0120] In some embodiments of this application, the mass per unit area of ​​the second segment 322 can be set to be greater than that of the first segment 321, i.e., the second segment 322 has a larger mass per unit area than the first segment 321. This results in a greater degree of compression of the second segment 322 onto the insulating sealing structure 8 compared to the first segment 321. Because the second segment 322 has a larger mass per unit area than the first segment 321, the difficulty of lifting the second segment 322 relative to the first segment 321 is increased, thus achieving a greater degree of compression of the insulating sealing structure 8 by the second segment 322 relative to the first segment 321. This can, to a certain extent, reduce the lifting amplitude of the second segment 322, improving the problem of poor sealing between the electrode post 2 and the housing 1 due to the large lifting amplitude of the second segment 322 failing to compress the insulating sealing structure 8. This improves the sealing performance between the housing 1 and the electrode post 2, reduces leakage, and enhances the reliability of the battery cell 102.

[0121] It is worth noting that when the second segment 322 has a larger mass per unit area relative to the first segment 321, the compression of the second segment 322 relative to the first segment 321 on the insulating sealing structure 8 may not be large. However, when the compression of the second segment 322 relative to the first segment 321 on the insulating sealing structure 8 is set to be large, and the mass of the second segment 322 relative to the first segment 321 is also large, a greater degree of compression of the second segment 322 relative to the first segment 321 on the insulating sealing structure 8 can be achieved more effectively. Therefore, by setting the mass of the second segment 322 relative to the first segment 321 to be large per unit area, it is easier to achieve a large compression of the second segment 322 relative to the first segment 321 on the insulating sealing structure 8. This not only allows the compression margin to compensate for the compression loss caused by the warping of the second segment 322, but also reduces the warping amplitude of the second segment 322. Consequently, the sealing performance between the casing 1 and the electrode post 2 can be improved more effectively, leakage problems can be mitigated, and the reliability of the battery cell 102 can be enhanced.

[0122] In some embodiments, the thickness of the second segment 322 is greater than the thickness of the first segment 321; and / or, the density of the second segment 322 is greater than the density of the first segment 321, that is, the second segment 322 is larger than at least one of the thickness and density of the first segment 321, that is, the density of the second segment 322 is greater than the density of the first segment 321, or the thickness of the second segment 322 is greater than the thickness of the first segment 321, or the density and thickness of the second segment 322 are both greater than the density and thickness of the first segment 321. Wherein, thickness is the dimension along the axial direction of the mounting hole 12, and when the thickness is not a constant value, the thickness refers to the average thickness.

[0123] Therefore, by setting the thickness and density of the second segment 322 to be greater than that of the first segment 321, it is easy to achieve a larger mass per unit area for the second segment 322 compared to the first segment 321, thereby reducing the structural complexity of the first extension 32 and reducing the design and processing difficulty of the first extension 32.

[0124] Of course, this application is not limited to this. For example, in other embodiments of this application, the second segment 322 or the first segment 321 may be configured as a composite structure composed of multiple parts, or some parts may be removed from the first segment 321, so that the second segment 322 has a larger mass per unit area than the first segment 321.

[0125] In some embodiments, the first segment 321 and the second segment 322 are made of the same material. The surface of the second segment 322 away from the first shell wall 13 is flush with the surface of the first segment 321 away from the first shell wall 13. The second segment 322 protrudes relative to the first segment 321 towards the first shell wall 13. Thus, by protruding towards the first shell wall 13 to increase the thickness of the second segment 322, it is easy to achieve a larger mass per unit area for the second segment 322 relative to the first segment 321. This not only increases the compression amount of the second segment 322 on the corresponding position of the insulating sealing structure 8, but also increases the difficulty of the second segment 322 being raised, thereby reducing the raising amplitude of the second segment 322. This improves the problem that the insulation sealing structure 8 cannot be pressed tightly due to the large raising amplitude of the second segment 322, resulting in poor sealing between the pole post 2 and the shell 1.

[0126] In some embodiments of this application, such as Figure 5 and Figure 6 As shown, the battery cell 102 has a receiving cavity 11 formed on the inner side of the first shell wall 13. The terminal post 2 includes a terminal post body 3, on which a receiving groove 36 is formed, opening away from the receiving cavity 11. The terminal post body 3 has a connecting hole 37, which penetrates the groove wall of the receiving groove 36 near the receiving cavity 11 and connects the receiving cavity 11 and the receiving groove 36. For example, when the through portion 33 is annular, the receiving groove 36 is located in the inner annular region of the through portion 33. For example, the receiving groove 36 can be defined by the through portion 33 and the support portion 39 located in the inner annular region of the through portion 33.

[0127] Therefore, when electrolyte is injected into the battery cell 102, the electrolyte can be injected into the receiving tank 36 and then flow towards the receiving cavity 11 through the connecting hole 37. The receiving tank 36 can buffer the electrolyte to improve problems such as splashing and overflow. Moreover, the sidewall of the receiving tank 36 (i.e., the tank wall extending from the opening of the receiving tank 36 towards the receiving cavity 11) can block electrolyte splashing to a certain extent, reducing electrolyte contamination to the outside and facilitating rapid electrolyte injection. Furthermore, since there is no need to separately open an injection channel on the housing 1, no special processing is required for the housing 1, which helps to reduce the structural complexity and processing difficulty of the housing 1.

[0128] In some embodiments of this application, such as Figure 5 and Figure 6As shown, the battery cell 102 includes a cell assembly 7. The cell assembly 7 includes an active material coating portion 71 housed in a receiving cavity 11, and a conductive portion 72 connected to the active material coating portion 71. The conductive portion 72 passes through a connecting hole 37 to be at least partially housed in a receiving groove 36. It is worth noting that there can be one or more connecting holes 37, and the conductive portion 72 can pass through at least one of the connecting holes 37. For example, at least one connecting hole 37 can allow electrolyte to pass through. For instance, at least one connecting hole 37 is left unobstructed (i.e., the conductive portion 72 is not inserted), thereby allowing electrolyte to pass through without obstruction by the conductive portion 72. Or, for instance, at least one connecting hole 37 can still allow electrolyte to pass through even after the conductive portion 72 has been inserted.

[0129] Therefore, by housing at least a portion of the conductive part 72 within the receiving groove 36, the conductive part 72 occupies at least a portion of the space within the receiving groove 36, thereby reducing the space occupied by the conductive part 72 within the receiving cavity 11. This saves space within the receiving cavity 11 to accommodate a larger volume of the active material coating part 71, which is beneficial for increasing the energy density of the battery cell 102, or for reducing the size of the battery cell 102 while keeping the energy density of the battery cell 102 constant.

[0130] It is understood that the active material coating part 71 may include a current collector coated with an active material layer, and the conductive part 72 may only include a tab, or it may include a tab and an adapter piece electrically connected to the tab, etc. There are no limitations here.

[0131] In some embodiments, the conductive portion 72 is welded to the electrode body 3 to form an electrical connection, thereby enabling the cell assembly 7 to output from the electrode at the electrode body 3. For example, as... Figure 6 As shown, the conductive part 72 is welded to the side wall of the receiving groove 36 near the receiving cavity 11, thereby improving the fit and facilitating the welding operation. Of course, this application is not limited to this. In other embodiments, the conductive part 72 can also be welded to the pole cover plate 4 to form an electrical connection, which is not limited here.

[0132] In some embodiments of this application, such as Figure 5 and Figure 6 As shown, the terminal post 2 includes a terminal post cover plate 4 covering the terminal post body 3. The terminal post cover plate 4 has an injection hole 43 that can communicate with the receiving groove 36. The battery cell 102 also includes a sealing structure 6 for sealing the injection hole 43.

[0133] Thus, when electrolyte needs to be injected into the battery cell 102, the sealing structure 6 is not installed at the injection hole 43, or the sealing structure 6 is in an open state. At this time, the electrolyte can be injected into the receiving tank 36 through the injection hole 43. After the electrolyte is injected, the sealing structure 6 can be installed at the injection hole 43, or the sealing structure 6 can be switched to a closed state, thereby sealing and closing the injection hole 43 to prevent electrolyte overflow and to prevent external foreign objects from entering the receiving cavity 11 from the injection hole 43, thereby improving the reliability of the battery cell 102.

[0134] Therefore, by machining the liquid injection hole 43 on the electrode cover plate 4, the opening is relatively small and located on the outside, and the liquid injection inlet can be reliably sealed by the sealing structure 6, thereby improving the working reliability of the battery cell 102. Moreover, the sealing structure 6 can be designed in a flexible and diverse manner.

[0135] In some embodiments, such as Figure 6 As shown, the electrode cap 4 does not have a portion that stops the sealing structure 6 on the outside (i.e., the side away from the receiving cavity 11), so that the sealing structure 6 is suitable for installation onto the electrode cap 4 from the outside (i.e., the side away from the receiving cavity 11). Thus, by configuring the sealing structure 6 to be installed onto the electrode cap 4 from the outside to seal the injection hole 43, the sealing structure 6 can be installed after injection, ensuring the sealing of the injection hole 43. Furthermore, the installation position is close to the outside, facilitating quick assembly of the sealing structure 6. Moreover, the installation of the sealing structure 6 does not adversely affect the connection between the electrode body 3 and the electrode cap 4, ensuring the reliability of the connection between the electrode cap 4 and the electrode body 3.

[0136] The sealing structure 6 can be either detachable or fixed. For example, when the sealing structure 6 is detachable, it facilitates the maintenance of the injection port 43. For instance, when electrolyte needs to be added, the sealing structure 6 can be removed, the injection port 43 can be opened, and electrolyte can be injected into the receiving cavity 11 through the injection port 43. Afterward, the sealing structure 6 can be reinstalled. For example, the sealing structure 6 can be detachably connected to the electrode cover plate 4 by means of threads or screws, thus facilitating disassembly and assembly.

[0137] For example, when the sealing structure 6 is a non-removable fixed form, it can be fixed to the pole cap plate 4 by welding, riveting or other methods, thereby improving the sealing reliability of the sealing structure 6 to the injection hole 43. For example, the injection hole 43 can be in the form of multiple segments. The sealing structure 6 can include a first sealing element 61 that is interference-fitted with the injection hole 43, and a second sealing element 62 that covers the first sealing element 61 and is welded to the pole cap plate 4.

[0138] Alternatively, in some embodiments, the second seal 62 can be configured to be detachably connected to the pole cap 4 by means of a screw fastener, so as to restrict the first seal 61 to a position that is interference-fitted with the injection hole 43.

[0139] In some embodiments of this application, such as Figure 6 As shown, at least a portion of the sealing structure 6 is embedded within the injection hole 43. That is, the sealing structure 6 can be entirely embedded within the injection hole 43, or only a portion of it can be embedded within the injection hole 43. This allows for full utilization of the space within the injection hole 43, improving the sealing reliability of the sealing structure 6. Furthermore, it reduces the height of the sealing structure 6 protruding beyond the injection hole 43, minimizing its impact on the space outside the electrode cover plate 4. This helps reduce interference with the manifold component 103, increases the connection area between the manifold component 103 and the electrode cover plate 4, and improves flow efficiency.

[0140] In some embodiments of this application, the first shell wall 13 is an integrally formed cover plate, or, as... Figure 5 As shown, the housing 1 includes a second housing wall 14, with the first housing wall 13 integrally formed with at least one second housing wall 14, and the second housing wall 14 extending toward one side of the first housing wall 13 in the thickness direction. This allows for flexible design of the electrode post 2's structural position, thereby increasing the applicability of the battery cell 102 in this embodiment.

[0141] It is worth noting that the second shell wall 14 can extend from the edge of the first shell wall 13. When the first shell wall 13 is rectangular, at least one of the four edges of the first shell wall 13 can extend into the second shell wall 14. For example, the first shell wall 13 may have only one edge extending into the second shell wall 14, or it may have only two edges extending into the second shell wall 14, or it may have three edges extending into the second shell wall 14, or all four edges extending into the second shell wall 14. For example, when the shell 1 is a rectangular shell, any wall of the rectangular shell can serve as the first shell wall 13.

[0142] For example, the shell 1 may include a shell body and a cover plate. The shell body defines a space open on one side, and the cover plate is located on the open side of the shell body to form a receiving cavity 11 between the shell body and the cover plate. In this case, the surface of the shell body opposite to the cover plate is the first shell wall 13, and the wall of the shell body connecting the first shell wall 13 and the cover plate is the second shell wall 14. Alternatively, the surface of the shell body opposite to the cover plate is the second shell wall 14, and the wall of the shell body connecting the second shell wall 14 and the cover plate is the first shell wall 13. Or, the cover plate is the first shell wall 13.

[0143] According to a second aspect of this application, this application also provides a battery 100, including a battery cell 102 of any of the above-described embodiments. It is worth noting that the battery 100 according to this application embodiment may or may not include a casing. Therefore, since the reliability of the battery cell 102 according to this application embodiment is improved, it is beneficial to improve the performance of the battery 100.

[0144] For example, such as Figure 11 As shown, the battery 100 may further include a busbar component 103, and multiple battery cells 102, with at least two connected electrically through the busbar component 103. This allows for the series connection and / or parallel connection of multiple battery cells 102. For example, when multiple battery cells 102 are connected in series, the anode terminal plate 4 of one battery cell 102 is connected to the cathode terminal plate 4 of the next battery cell 102 through a busbar component 103, while the cathode terminal plate 4 of the same battery cell 102 is connected to the anode terminal plate 4 of the previous battery cell 102 through another busbar component 103.

[0145] According to a third aspect of this application, this application also provides an electrical device including a battery 100 of any of the above-described embodiments, the battery 100 being used to provide electrical energy to the electrical device. The electrical device can be any of the aforementioned devices or systems using the battery 100. Because the performance of the battery 100 is improved, it is beneficial to improve the power consumption performance of the electrical device.

[0146] The following describes a specific embodiment of a battery cell 102 according to this application.

[0147] The battery cell 102 includes a housing 1, a terminal post 2, and an insulating sealing structure 8. The housing 1 includes a first housing wall 13 with a mounting hole 12. The terminal post 2 includes a terminal post body 3 and a terminal post cover 4. The terminal post cover 4 covers the outside of the terminal post body 3. The terminal post body 3 includes a through portion 33 that passes through the mounting hole 12, a first extension portion 32 that is connected to the through portion 33 and extends in a direction away from the central axis L of the mounting hole 12 relative to the through portion 33, and a second extension portion 38 that is connected to the through portion 33 and extends in a direction away from the central axis L of the mounting hole 12 relative to the through portion 33. The first extension portion 32 extends to the outer side of the outer surface of the first housing wall 13, and the second extension portion 38 extends to the inner side of the inner surface of the first housing wall 13. The first extension portion 32 is formed by flanging and riveting of the terminal post 2.

[0148] The first extension 32 includes a first segment 321 and a second segment 322 arranged sequentially along the direction away from the central axis L of the mounting hole 12. The thickness of the second segment 322 in the axial direction of the mounting hole 12 is greater than the thickness of the first segment 321 in the axial direction of the mounting hole 12. The side surface of the first segment 321 near the first shell wall 13 is the first surface 3211, and the side surface of the second segment 322 near the first shell wall 13 is the second surface 3221. The first surface 3211 extends obliquely towards the direction near the first shell wall 13 along the direction away from the central axis L of the mounting hole 12. The second surface 3221 is parallel to the first shell wall 13. The first surface 3211 and the second surface 3221 are connected by a line so that the second surface 3221 protrudes relative to the first surface 3211 towards the direction near the first shell wall 13. For example, before riveting the pole post 2, the portion corresponding to the first extension 32 can be set as a trapezoid. After riveting, the second section 322 can be obtained in a shape that protrudes towards the first shell wall 13 relative to the first section 321.

[0149] The through-hole portion 33 and the first extension portion 32 form a first pole post portion. The insulating sealing structure 8 includes a first insulating seal 81 that fits between the first pole post portion and the first housing wall 13. The through-hole portion 33 and the second extension portion 38 form a second pole post portion. The insulating sealing structure 8 includes a second insulating seal 82 that fits between the second pole post portion and the first housing wall 13. The second insulating seal 82 and the first insulating seal 81 are separately disposed. The first insulating seal 81 is a plastic part, and the second insulating seal 82 is a rubber part. The material hardness of the first insulating seal 81 is greater than that of the second insulating seal 82. The shape of the side surface of the first insulating seal 81 away from the first housing wall 13 matches the shape of the side surface of the first extension portion 32 facing the first housing wall 13. The second insulating seal 82 includes a first part 821 disposed opposite to the first section portion 321 along the axial direction of the mounting hole 12, and a second part 822 disposed opposite to the second section portion 322 along the axial direction of the mounting hole 12.

[0150] During assembly, the first insulating seal 81, the second insulating seal 82 and the pole body 3 can be installed at the mounting hole 12 of the first shell wall 13. Then, the first extension 32 is processed by riveting. At this time, the first extension 32 will apply a force to the first insulating seal 81. The first insulating seal 81 applies the force to the second insulating seal 82 through the first shell wall 13. Since the second section 322 protrudes towards the first section 321 relative to the first section 321, the compression of the second section 822 is greater than the compression of the first section 821.

[0151] Therefore, the insulating sealing structure 8 can reserve a certain compression margin at the position corresponding to the second section 322. When the welding shrinkage deformation of the pole cover plate 4 and the pole body 3 causes the second section 322 to warp, since the insulating sealing structure 8 has a compression margin at the position corresponding to the second section 322, the compression margin can be used to compensate for the compression loss caused by the warping of the second section 322. This ensures that the compression of the insulating sealing structure 8 at the position corresponding to the second section 322 is still sufficient, improving the reliability of the seal and solving the problem of leakage caused by seal failure due to excessive compression loss. In addition, since the shape of the side surface of the first insulating seal 81 away from the first shell wall 13 matches the shape of the side surface of the first extension 32 facing the first shell wall 13, it helps to reduce the problem of the first insulating seal 81 loosening under vibration and impact environments, improving the installation stability of the first insulating seal 81 and the reliability of the insulating seal.

[0152] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0153] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The first shell wall has mounting holes; The pole includes a through portion passing through the mounting hole, and a first extension portion connected to the through portion and extending relative to the through portion in a direction away from the central axis of the mounting hole, the first extension portion extending to the outer side of the outer surface of the first shell wall. An insulating and sealing structure is fitted between the pole post and the first housing wall, wherein the first extension includes a first section and a second section arranged sequentially along a direction away from the central axis of the mounting hole, and the second section has a greater degree of compression on the insulating and sealing structure than the first section; The pole post further includes a second extension connected to the through portion and extending relative to the through portion in a direction away from the central axis of the mounting hole. The second extension and the first extension extend to the inner and outer sides of the first shell wall, respectively. The insulating sealing structure includes a first insulating sealing member at least partially disposed between the first extension and the first shell wall, and a second insulating sealing member at least partially disposed between the second extension and the first shell wall. The material hardness of the first insulating sealing member is greater than that of the second insulating sealing member. The compression amount of the second segment on the insulating sealing structure is greater than the compression amount of the first segment on the insulating sealing structure. The second insulating seal includes a first part disposed opposite to the first segment along the axial direction of the mounting hole and a second part disposed opposite to the second segment along the axial direction of the mounting hole. The compression amount of the second part is greater than the compression amount of the first part. The surface of the first segment closest to the first shell wall is the first surface, and the surface of the second segment closest to the first shell wall is the second surface. The second surface protrudes relative to the first surface in the direction close to the first shell wall, and the shape of the surface of the first insulating seal away from the first shell wall matches the shape of the surface of the first extension facing the first shell wall.

2. The battery cell according to claim 1, characterized in that, The first surface extends at an angle toward the first shell wall along a direction away from the central axis of the mounting hole.

3. The battery cell according to claim 2, characterized in that, The first surface and the second surface are connected by a line or by a chamfer.

4. The battery cell according to claim 1, characterized in that, The thickness of the second segment in the axial direction of the mounting hole is greater than the thickness of the first segment in the axial direction of the mounting hole.

5. The battery cell according to claim 4, characterized in that, The surface of the second segment away from the first shell wall is flush with the surface of the first segment away from the first shell wall.

6. The battery cell according to claim 1, characterized in that, The first extension portion extends at least half of its dimension in the direction away from the central axis of the mounting hole and engages with the first shell wall stop.

7. The battery cell according to claim 1, characterized in that, The pole includes a pole body and a pole cover plate. The pole body includes a first extension and a second extension. The first extension extends to the outer side of the outer surface of the first shell wall. The pole cover plate covers the outer side of the pole body, and the pole body and the pole cover plate are welded together.

8. The battery cell according to claim 7, characterized in that, The first extension protrudes outward from the through portion toward the outside of the first shell wall to define a groove between the first extension and the through portion. The edge of the pole cover plate is disposed in the groove and is welded through to the through portion. The welded structure formed by the welding is spaced apart from the first extension.

9. The battery cell according to any one of claims 1-8, characterized in that, The pole post is formed into the first extension by flanging and riveting.

10. The battery cell according to any one of claims 1-8, characterized in that, The mass per unit area of ​​the second segment is greater than the mass per unit area of ​​the first segment.

11. The battery cell according to claim 10, characterized in that, The thickness of the second segment is greater than the thickness of the first segment; And / or, The density of the second segment is greater than the density of the first segment.

12. The battery cell according to any one of claims 1-8, characterized in that, The battery cell has a receiving cavity formed on the inner side of the first shell wall. The terminal post includes a terminal post body, and a receiving groove is formed on the terminal post body in a direction that opens away from the receiving cavity. The terminal post body has a connecting hole, which penetrates the groove wall of the receiving groove near the receiving cavity and connects the receiving cavity and the receiving groove.

13. The battery cell according to claim 12, characterized in that, The battery cell includes a cell assembly, which includes an active material coating portion housed in the receiving cavity and a conductive portion connected to the active material coating portion. The conductive portion passes through the connecting hole to be at least partially housed in the receiving groove.

14. The battery cell according to claim 12, characterized in that, The terminal post includes a terminal post cover plate covering the terminal post body, and an injection hole is formed on the terminal post cover plate that can communicate with the receiving groove. The battery cell also includes a sealing structure for sealing the injection hole.

15. A battery, characterized in that, Includes the battery cell according to any one of claims 1-14.

16. An electrical appliance, characterized in that, Includes the battery according to claim 15.

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