Battery cells, batteries and electrical devices

Abstract

The present invention relates to a battery cell, a battery, and an electrical device, which belong to the technical field of batteries. The battery cell includes a first case wall, a pole, and an insulating sealing structure, the first case wall has a mounting hole, the pole includes an insertion portion inserted into the mounting hole, and a first extension portion connected to the insertion portion and extending from the insertion portion in a direction away from the central axis of the mounting hole, the first extension portion extending outward from the outer surface or inward from the inner surface of the first case wall, the insulating sealing structure is fitted between the pole and the first case wall, the first extension portion includes a first section portion and a second section portion arranged in order in a direction away from the central axis of the mounting hole, and the second section portion presses against the insulating sealing structure to a greater extent than the first section portion.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application is based on and claims priority from a Chinese patent application having application number 202311251687.1 and filing date September 26, 2023, the entire contents of which are hereby incorporated by reference into the present application. This application relates to the technical field of batteries, and in particular to battery cells, batteries and electrical devices. [Background technology]

[0002] In recent years, new energy vehicles have made great strides in development, and in the field of electric vehicles, power batteries play an irreplaceable role as the power source for electric vehicles. Power batteries contain multiple battery cells, but the reliability of battery cells still needs to be improved. Summary of the Invention

[0003] The embodiments of the present application provide a battery cell, a battery, and an electric device that can improve the reliability of the battery cell.

[0004] In a first aspect, an embodiment of the present application provides a battery cell including a first case wall, a pole, and an insulating sealing structure, wherein a mounting hole is formed in the first case wall, the pole includes an insertion portion inserted into the mounting hole, and a first extension portion connected to the insertion portion and extending relative to the insertion portion in a direction away from the central axis of the mounting hole, the first extension portion extending outside the outer surface or inside the inner surface of the first case wall, the insulating sealing structure is fitted between the pole and the first case wall, the first extension portion includes a first section portion and a second section portion arranged in sequence in a direction away from the central axis of the mounting hole, and the second section portion presses against the insulating sealing structure to a greater extent than the first section portion.

[0005] In the above technical solution, by applying a stronger pressure to the insulating sealing structure to the second section than to the first section, if warping of the second section outside the first section occurs due to the effects of welding or the like, the stronger pressure applied to the insulating sealing structure by the second section than to the first section can alleviate the problem of insufficient compression of the insulating sealing structure due to warping of the second section, thereby improving the reliability of the seal between the pole and the case and the reliability of the battery cell.

[0006] In some embodiments, the second section compresses against the insulating sealing structure more than the first section compresses against the insulating sealing structure.

[0007] In the above technical solution, the second section compresses the insulating sealing structure to a greater extent than the first section. Therefore, when the first section meets the requirement for the compression of the insulating sealing structure, a compression allowance is generated in the compression of the insulating sealing structure of the second section, and the second section exerts a stronger pressure on the insulating sealing structure than the first section. Thus, when the second section warps, the compression allowance compensates for the loss of compression due to the warping of the second section, so that the compression of the warped second section against the insulating sealing structure still meets the requirement for the compression, thereby improving the sealing between the case and the pole, mitigating leakage problems, and improving the reliability of the battery cell.

[0008] In some embodiments, the surface of the first section portion closer to the first case wall is a first surface, and the surface of the second section portion closer to the first case wall is a second surface, and the second surface protrudes relative to the first surface in a direction closer to the first case wall.

[0009] In the above technical solution, by protruding the second section toward the first case wall, it is easy to achieve a greater compression amount of the second section against the insulating sealing structure than the first section, leaving a certain compression allowance. Thus, when the second section warps relative to the first section and the degree of warping is relatively high, the compression allowance and the loss of compression due to the warping of the second section offset each other, allowing the second section to still compress the insulating sealing structure sufficiently to maintain sealing, thereby alleviating the problem of poor sealing between the case and the terminal post due to warping of the second section. And / or, by protruding the second section toward the first case wall and increasing its thickness, it is easy to achieve a greater mass per unit area of ​​the second section than the first section, improving the warping resistance of the second section and further reducing the degree of warping of the second section, thereby alleviating the problem of poor sealing between the terminal post and the case due to insufficient pressing of the insulating sealing structure due to a high degree of warping of the second section.

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

[0011] The above technical solution can improve the problem of a large step being formed at the connection between the first surface of the first section and the second surface of the second section, and can also improve the problem of cracking due to large deformation, thereby improving the structural reliability of the first extension part.

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

[0013] In the above technical solution, no step is formed at the connection portion between the first surface and the second surface, which alleviates the problem of the first extension portion tearing at the connection portion, while also alleviating the problem of the insulating sealing structure tearing due to concentrated force at the point corresponding to the connection portion, thereby achieving the effect of protecting the insulating sealing structure.

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

[0015] In the above technical solution, by increasing the thickness of the second section and limiting the direction of the increase in the thickness of the second section to the direction facing the first case wall, the amount of compression of the second section with respect to the insulating sealing structure can be increased, leaving a certain amount of compression allowance to compensate for the loss of compression due to warping of at least a portion of the second section.Increasing the mass of the second section also improves the warping resistance of the second section, and further reduces the degree of warping of the second section, thereby solving the problem of insufficient compression of the insulating sealing structure due to warping of the second section, and also improving the sealing between the pole and the case.

[0016] In some embodiments, the surface of the second section facing away from the first case wall is flush with the surface of the first section facing away from the first case wall.

[0017] In the above technical solution, the structure and processing of the first extending portion can be simplified.

[0018] In some embodiments, the first extension abuts and fits against the first case wall over at least half of the dimension extending in a direction away from the central axis of the mounting hole.

[0019] In the above technical solution, the first extending portion may have a long dimension to abut and fit against the first housing wall, thereby effectively pressing the insulating sealing structure and improving the sealing reliability.

[0020] In some embodiments, the pole post further includes a second extension portion connected to the insertion portion and extending away from the central axis of the mounting hole relative to the insertion portion, the second extension portion and the first extension portion respectively extending on both the inner and outer sides of the first case wall, the insulating sealing structure including a first insulating sealing member at least partially disposed between the first extension portion and the first case wall, and a second insulating sealing member at least partially disposed between the second extension portion and the first case wall, and the material hardness of the first insulating sealing member is higher than the material hardness of the second insulating sealing member.

[0021] In the above technical solution, the pressing force applied by the first extension portion to the first insulating sealing member can be effectively transmitted to the second insulating sealing member, thereby allowing the second insulating sealing member to be effectively compressed, and the compression amount of the first insulating sealing member can be smaller than the compression amount of the second insulating sealing member, so that both the first insulating sealing member and the second insulating sealing member can effectively perform the sealing effect.

[0022] In some embodiments, the surface of the first insulating sealing member facing away from the first case wall and the surface of the first extension facing towards the first case wall are congruent in shape.

[0023] In the above technical solution, the contact area between the first insulating sealing member and the first extension portion is increased, which can reduce the problem of the first insulating sealing member being torn due to localized concentrated acting force. Furthermore, when the second section portion protrudes toward the first case wall relative to the first section portion, the matching shapes form a concave-convex fit between the first extension portion and the first insulating sealing member, which can exert a positional control effect. This is advantageous in reducing the problem of play and detachment of the first insulating sealing member during vibration and impact of the battery cell, and the installation stability of the first insulating sealing member is improved, and the first insulating sealing member can achieve a reliable insulating sealing effect.

[0024] In some embodiments, the pole includes a pole body and a pole cover plate, the pole body includes a first extension portion and a second extension portion, the first extension portion extends outside the outer surface of the first case wall, the pole cover plate covers the outside of the pole body, and the pole body is welded to the pole cover plate.

[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 portion than to the second extension portion, and the heat generated by welding the pole cover plate and the pole body is transferred more to the first insulating sealing member than to the second insulating sealing member. Since the material hardness of the first insulating sealing member is higher than that of the second insulating sealing member, the heat resistance of the first insulating sealing member is stronger than that of the second insulating sealing member. For example, since the first insulating sealing member is made of a plastic material and the second insulating sealing member is made of a rubber material, the heat influence on the second insulating sealing member when welding the pole body and the pole cover plate can be reduced as much as possible, thereby improving the sealing reliability between the first case wall and the pole.

[0026] In some embodiments, the first extension protrudes from the insertion portion to the outside of the first case wall, defining a countersunk groove between the first extension and the insertion portion, the edge of the pole post cover plate is disposed in the countersunk groove and is welded to the insertion portion through-welding, and the welded structure formed by welding is spaced apart from the first extension.

[0027]

[0009] In the above technical solution, the shrinkage stress caused by solidification of the molten pool formed by welding can be blocked by the above gap and is hardly or only little transmitted to the first extension part, thereby improving the warpage problem of the first extension part, so that the first extension part can firmly press the insulating sealing structure and improve the insulating sealing effect. Furthermore, because the edge of the electrode post cover plate is disposed in the counterbore groove and is not butt-welded to the first extension part but is penetrate-welded to the insertion part, it is not necessary to ensure a small installation gap between the edge of the electrode post cover plate and the first extension part to meet the butt welding requirements, so the gap between the edge of the electrode post cover plate and the first extension part can be made larger, which further improves the compatibility of the electrode post body and helps to lower the processing accuracy requirements for the electrode post cover plate and the electrode post body.

[0028] In some embodiments, the first extension portion is formed on the pole by burring and caulking.

[0029]

[0013] In the above technical solution, the terminal post is easy to process, which helps improve the connection reliability between the first extension portion and the insertion portion and the mounting reliability between the terminal post and the first case wall. For example, before the first extension portion is riveted, the first extension portion may have a relatively protruding outer surface at its outer end. After the first extension portion is burred and crimped, the third surface of the first section and the fourth surface of the second section are flush with each other, and the second surface of the second section protrudes toward the first case wall relative to the first surface of the first section. In this way, the second section can be compressed more than the first section with respect to the insulating sealing structure during burring and crimping. This makes it easy to obtain a compression allowance corresponding to the second section, and alleviates the problem of poor sealing due to warping of the second section.

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

[0031] In the above technical solution, the second section has a larger mass per unit area than the first section, which improves the warpage resistance of the second section compared to the first section and allows the second section to exert a stronger pressure on the insulating sealing structure than the first section. This reduces the warpage of the second section to a certain extent, alleviating the problem of insufficient pressure on the insulating sealing structure due to a large warpage in the second section, resulting in poor sealing between the electrode post and the case. This improves the sealing between the case and the electrode post, reduces leakage issues, and improves battery cell reliability. Furthermore, by making the mass per unit area of ​​the second section larger than that of the first section, it is easy to achieve a greater compression amount of the second section against the insulating sealing structure than the first section. This not only compensates for the loss of compression due to the warpage of the second section, but also reduces the warpage of the second section, more effectively improving the sealing between the case and the electrode post, reduces leakage issues, and improves battery cell reliability.

[0032] In some embodiments, the second section has a greater thickness than the first section and / or a greater density than the first section.

[0033] In the above technical solution, by making at least one of the thickness and density of the second section greater than that of the first section, it is easy to achieve that the mass per unit area of ​​the second section is greater than that of the first section, thereby reducing the structural complexity of the first extension and the difficulty of designing and processing the first extension.

[0034] In some embodiments, the battery cell has an accommodating cavity formed inside the first case wall, the pole includes a pole body, and the pole body has an accommodating groove formed therein that opens in a direction away from the accommodating cavity, and the pole body has a communicating hole that penetrates the groove wall on the side of the accommodating groove that is closer to the accommodating cavity, connecting the accommodating cavity and the accommodating groove.

[0035] In the above technical solution, when injecting electrolyte into the battery cell, the electrolyte can be injected into the receiving groove and then flow into the receiving cavity through the communication hole. In this case, the receiving groove serves to temporarily store the electrolyte, thereby alleviating problems such as electrolyte spillage and leakage. In addition, the side walls of the receiving groove can prevent electrolyte spillage to a certain extent, reducing external contamination caused by the electrolyte and facilitating rapid injection. Furthermore, since there is no need to separately create an injection passage in the case, special processing of the case is not required, which helps reduce the structural complexity and processing difficulty of the case.

[0036] In some embodiments, the battery cell includes a cell assembly, the cell assembly including an active material application portion accommodated in the accommodating cavity and a conductive portion connected to the active material application portion, the conductive portion being inserted into the communicating hole so as to be at least partially accommodated in the accommodating groove.

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

[0038] In some embodiments, the pole includes a pole cover plate covering the pole body, the pole cover plate has an inlet hole that can communicate with the receiving groove, and the battery cell further includes a sealing structure for sealing the inlet hole.

[0039] In the above technical solution, the injection hole is machined into the pole cover plate, and the hole is relatively small and located close to the outside. This makes it easy to achieve reliable sealing of the injection port using the sealing structure, improving the operational reliability of the battery cell and enabling flexible and diverse designs of the sealing structure.

[0040] In a second aspect, an embodiment of the present application further provides a battery including the battery cell according to any of the above solutions.

[0041] In the above technical solution, the reliability of the battery cell according to the embodiment of the present application is improved, which helps to improve the performance of the battery.

[0042] In a third aspect, embodiments of the present application further provide an electrical device comprising a battery according to any of the above solutions.

[0043] In the above technical solution, the performance of the battery is improved, which helps to improve the operating power performance of the electrical device. [Brief explanation of the drawings]

[0044] In order to more clearly explain the technical solutions of the embodiments of the present application, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only illustrate some embodiments of the present application, and should not be considered as limiting the scope, and those skilled in the art can come up with other drawings based on these drawings without any creative work. [Figure 1] 1 is a structural schematic diagram of a vehicle provided in some embodiments of the present application. [Figure 2] FIG. 1 is an exploded view of the structure of a battery provided in some embodiments of the present application. [Figure 3] 1 is a structural schematic diagram of a battery cell provided in some embodiments of the present application. [Figure 4] FIG. 1 is an orthographic view of a battery cell provided in some embodiments of the present application. [Figure 5] FIG. 5 is a cross-sectional view taken along line AA in FIG. [Figure 6] FIG. 6 is a partial enlarged view of a portion B indicated by a circle in FIG. 5. [Figure 7] FIG. 7 is a partially enlarged view of a portion C indicated by a circle in FIG. [Figure 8] 1 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application. [Figure 9] FIG. 2 is a state diagram of a terminal post provided in some embodiments of the present application before riveting. [Figure 10] FIG. 10 is a state diagram of the pole post provided in some embodiments of the present application after it has not been riveted. [Figure 11] 1 is a schematic diagram of a battery cell and a current collecting member fitted together according to some embodiments of the present application. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0045] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application, and it should be understood that the described embodiments are only a part of the embodiments of the present application, and are not all of the embodiments. Based on the embodiments of the present application, other embodiments that can be obtained by those skilled in the art without any creative work shall all fall within the scope of protection of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the art. In this application, the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit the application. The terms "comprise" and "have" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive "comprises." The terms "first," "second," etc. in the specification and claims of this application or the above-mentioned drawings are intended to distinguish different objects and are not intended to describe a particular order or a primary-secondary relationship.

[0047] When an "embodiment" is described in this application, it means that a particular feature, structure, or characteristic described by the embodiment may be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification do not necessarily refer to the same embodiment, nor do they refer to an embodiment that is exclusively independent of or alternative to other embodiments.

[0048] In the description of this application, unless otherwise clearly defined or limited, the terms "attach," "couple," "connect," "fix," etc. should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection, and may also refer to a direct connection, an indirect connection via an intermediate, or internal communication between two elements. Those skilled in the art can understand the specific meanings of the above terms in this application according to specific circumstances.

[0049] The term "and / or" in this application is merely used to describe the relationship between related objects and indicates that there may be three relationships, for example, A and / or B can represent the cases where A exists alone, A and B exist simultaneously, or B exists alone. Also, the symbol " / " in this application generally means that the related objects before and after it are in an "or" relationship.

[0050] In the embodiments of the present application, the same reference numerals denote the same elements, and for the sake of brevity, detailed descriptions of the same elements in different embodiments will be omitted. It should be understood that the dimensions such as thickness, length, and width of various elements in the embodiments of the present application shown in the drawings, and the overall dimensions such as thickness, length, and width of the integrated device, are merely illustrative and do not limit the present application in any way.

[0051] The term "plurality" as used in this application means two or more (including two).

[0052] In this application, the battery cells may include lithium ion secondary batteries, lithium ion primary batteries, lithium-sulfur batteries, sodium lithium ion batteries, sodium ion batteries, magnesium ion batteries, etc., and the examples of this application are not limited thereto. The battery cells may be cylindrical, flat, rectangular, or have other shapes, and the examples of this application are not limited thereto. Battery cells are generally divided into three types based on packaging methods: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the examples of this application are not limited thereto.

[0053] The battery referred to in the embodiments of this application refers to a single physical module with one or more battery cells to provide higher voltage and capacity. For example, the battery referred to 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 box for enclosing one or more battery cells or one or more battery modules. The box can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0054] A battery cell includes a case, a cell assembly, and an electrolyte, and the case accommodates the cell assembly and the electrolyte. The cell assembly includes at least one electrode assembly, which is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly may have a wound structure or a laminated structure. The battery cell operates primarily through the movement of metal ions between the positive electrode sheet and the negative electrode sheet.

[0055] The positive electrode sheet generally includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer being directly or indirectly applied to the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protruding from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serving as a positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector may be aluminum, and the material of the positive electrode active material layer may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, etc.

[0056] The negative electrode sheet generally includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer being directly or indirectly applied to the negative electrode current collector, the negative electrode current collector not coated with the negative electrode active material layer protruding from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector not coated with the negative electrode active material layer becoming a negative electrode tab. The material of the negative electrode current collector may be copper, and the material of the negative electrode active material layer may be carbon or silicon, etc.

[0057] To prevent melting when a large current flows, multiple positive electrode tabs are stacked together to form a positive electrode tab portion, and multiple negative electrode tabs are stacked together to form a negative electrode tab portion. The case is provided with poles, and the positive electrode tab portion is electrically connected to the positive electrode pole, and the negative electrode tab portion is electrically connected to the negative electrode pole. For example, the tab portions may be connected to the poles to form a direct electrical connection between the tab portions and the poles. Alternatively, for example, the cell assembly may include an adapter sheet, and the tab portions are connected to the adapter sheet, and the adapter sheet is connected to the poles to form an indirect electrical connection between the tab portions and the poles.

[0058] The material of the separator is not limited, and may be, for example, polypropylene or polyethylene.

[0059] In some battery cells in the related art, a case is provided with poles, which are electrically connected to a cell assembly housed in the case to realize electrode output, and an insulating sealing structure is provided between the poles and the case. Here, the poles are inserted into the case and include abutting edges that abut on both the inside and outside of the case. The abutting edges are prone to warping due to welding and other factors, and the abutting edges are more prone to warping near the edges, making it difficult to press the insulating sealing structure firmly, resulting in insufficient compression of the insulating sealing structure and affecting the sealing effect between the case and the poles.

[0060] Therefore, an embodiment of the present application provides a battery cell including a case, a pole, and an insulating sealing structure, wherein the case includes a first case wall, the first case wall having a mounting hole formed therein, the pole including an insertion portion inserted into the mounting hole, and a first extension portion connected to the insertion portion and extending relative to the insertion portion in a direction away from the central axis of the mounting hole, the first extension portion extending toward the outside or inside of the outer surface or inner surface of the first case wall, the insulating sealing structure being fitted between the pole and the first case wall, the first extension portion including a first section portion and a second section portion arranged in sequence in a direction away from the central axis of the mounting hole, and the second section portion pressing against the insulating sealing structure to a greater extent than the first section portion.

[0061] As a result, by making the second section press harder against the insulating sealing structure than the first section, when the second section outside the first section warps due to welding or other factors, the second section presses harder against the insulating sealing structure than the first section, which further improves the problem of insufficient compression of the insulating sealing structure due to warping of the second section, improving the reliability of the seal between the pole and the case and therefore the reliability of the battery cell.

[0062] An embodiment of the present application provides an electric device that uses a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, an electric two-wheeler, an electric car, a boat, an aircraft, etc. Among them, the electric toy may include a stationary or movable electric toy, such as a game console, an electric car toy, an electric boat toy, and an electric plane toy, and the aircraft may include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0063] In the following embodiment, for convenience of explanation, an example will be described in which an electric device according to an embodiment of the present application is a vehicle 1000.

[0064] Please refer to FIG. 1 , which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a natural gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extender vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, front, or rear of the vehicle 1000. The battery 100 is used to supply power to the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 1000 to supply power to the motor 300, for example, for starting the vehicle 1000, navigation, and running power needs during driving.

[0065] In some embodiments of the present application, the battery 100 not only serves as an operating power source for the vehicle 1000, but can also provide driving power to the vehicle 1000 as a driving power source for the vehicle 1000, replacing all or part of gasoline or natural gas.

[0066] Please refer to FIG. 2, which is an exploded view of the structure of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box 101 and a plurality of battery cells 102, which are housed in the box 101. Here, the box 101 is for providing a mounting space for the battery cells 102, and the box 101 may have various structures. In some embodiments, the box 101 may include a first box body 1011 and a second box body 1012, which are stacked together to define a mounting space for housing the battery cells 102. The second box body 1012 may have a hollow structure with one end open, the first box body 1011 may have a plate-like structure, and the first box body 1011 may be placed on the open side of the second box body 1012, thereby defining an installation space between the first box body 1011 and the second box body 1012. The first box body 1011 and the second box body 1012 may also have a hollow structure with one end open, with the open side of the first box body 1011 placed on 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 may have various shapes, such as a cylindrical shape or a rectangular parallelepiped shape.

[0067] In the battery 100, the multiple battery cells 102 may be connected in series, parallel, or a mixed connection. A mixed connection refers to both the multiple battery cells 102 connected in series and the multiple battery cells 102 connected in parallel. The multiple battery cells 102 may be directly connected in series, parallel, or a mixed connection, and then the integrated multiple battery cells 102 may be housed in the box 101. Of course, the battery 100 may also be formed by connecting the multiple battery cells 102 in series, parallel, or a mixed connection to form a battery module, and then integrating the multiple battery modules in series, parallel, or a mixed connection and housing them in the box 101. The battery 100 may further include other structures, for example, the battery 100 may further include a current collecting member for achieving electrical welding between the multiple battery cells 102.

[0068] Here, each battery cell 102 may be a secondary battery or a primary battery, and may also be, but is not limited to, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cells 102 may be cylindrical, flat, rectangular, or the like. For example, referring to the embodiment shown in FIG. 3 , the length direction of the battery cells 102 is a first direction X, the width direction of the battery cells 102 is a second direction Y, and the height direction of the battery cells 102 is a third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other, two by two.

[0069] 3 to 6 , in some embodiments of the present application, a battery cell 102 includes a case 1 and a pole 2, the pole 2 is provided in the case 1, and an accommodating cavity 11 is formed inside the case 1. Exemplarily, the battery cell 102 includes a cell assembly 7, and the cell assembly 7 may include an active material coated portion 71 and a conductive portion 72 connected to the active material coated portion 71, the active material coated portion 71 being accommodated in the accommodating cavity 11, and the conductive portion 72 being welded to the pole 2 so as to be electrically connected between the active material coated portion 71 and the pole 2.

[0070] 5 and 6, the case 1 includes a first case wall 13, which has a mounting hole 12 formed therein. The electrode post 2 is inserted into the mounting hole 12 for attachment to the first case wall 13. The electrode post 2 includes an insertion portion 33 and a first extension portion 32, of which the insertion portion 33 is inserted into the mounting hole 12. That is, the insertion portion 33 is at least partially located within the mounting hole 12. The projection direction of the insertion portion 33 is the axial direction of the mounting hole 12, and the plane perpendicular to the axial direction of the mounting hole 12 is the projection plane. Therefore, the projection of the insertion portion 33 on the projection plane is within the range of the projection of the mounting hole 12 on the projection plane. Therefore, the insertion portion 33 can be inserted into the mounting hole 12. The type of electrode post 2 is not limited, and it may be either a cathode post or an anode post.

[0071] 5 and 6, the first extension portion 32 is connected to the insertion portion 33 and extends relative to the insertion portion 33 in a direction away from the central axis L of the mounting hole 12, and the first extension portion 32 extends toward the outside of the outer surface or the inside of the inner surface of the first case wall 13. Here, both surfaces in the thickness direction of the first case wall 13 are the outer surface and the inner surface, respectively, the inner surface is the surface of the first case wall 13 facing the accommodating cavity 11, the outer surface is the surface of the first case wall 13 facing away from the accommodating cavity 11, the side of the outer surface facing away from the accommodating cavity 11 is the outside of the outer surface, and the side of the inner surface facing the accommodating cavity 11 is the inside of the inner surface. "The first extension portion 32 extends toward the outside of the outer surface or the inside of the inner surface of the first case wall 13" means that the first extension portion 32 at least partially faces the first case wall 13, the axial direction of the mounting hole 12 is the projection direction, and a plane perpendicular to the axial direction of the mounting hole 12 is the projection plane, and the projection of the first extension portion 32 on the projection plane and the projection of the first case wall 13 on the projection plane have an overlapping area, and the part of the first extension portion 32 corresponding to the overlapping area faces the first case wall 13.

[0072] 5 and 6, the battery cell 102 further includes an insulating sealing structure 8 fitted between the first case wall 13 and the pole 2, that is, at least a portion of the insulating sealing structure 8 is sandwiched between the first case wall 13 and the pole 2, whereby the pole 2 and the first case wall 13 are indirectly fitted together via the insulating sealing structure 8, thereby realizing insulation and sealing between the first case wall 13 and the pole 2.

[0073] 6 and 7, the first extension portion 32 includes a first section portion 321 and a second section portion 322 arranged in sequence in a direction away from the central axis L of the mounting hole 12. In other words, the second section portion 322 is arranged closer to the edge of the first extension portion 32 than the first section portion 321. For example, the portion to the right of the auxiliary line M shown in FIG. 7 is the first section portion 321, and the portion to the left of the auxiliary line M is the second section portion 322.

[0074] 6 , when the electrode post 2 includes the electrode post body 3 and the electrode post cover plate 4, when the edge of the electrode post cover plate 4 is welded to the first extension 32, the first extension 32 is likely to warp due to the welding, and the degree of warping is greater in the first extension 32 closer to the edge. Alternatively, when the electrode post 2 is an integral member and is welded to the current collecting member 103 provided on the electrode post 2, the first extension 32 is likely to warp due to the welding, and the degree of warping is greater in the first extension 32 closer to the edge. If the degree of warping at the edge of the first extension 32 becomes too great, the edge of the first extension 32 cannot press firmly against the insulating sealing structure 8, resulting in an insufficient compression of the insulating sealing structure 8 and affecting the sealing effect between the case 1 and the electrode post 2.

[0075] In order to solve the above technical problems, in the embodiment of the present application, the degree of pressure applied by the second section 322 to the insulating sealing structure 8 is made stronger than that of the first section 321. This means that when the second section 322 outside the first section 321 warps due to welding or other factors, the degree of pressure applied by the second section 322 to the insulating sealing structure 8 is stronger than that of the first section 321. This further improves the problem of insufficient compression of the insulating sealing structure 8 due to warping of the second section 322, improves the sealing reliability between the pole 2 and the case 1, and improves the reliability of the battery cell 102.

[0076] It should be noted that there are various ways to achieve "the degree of pressure of the second section portion 322 against the insulating sealing structure 8 being stronger than that of the first section portion 321." For example, in some embodiments, the degree of pressure of the second section portion 322 against the insulating sealing structure 8 is made stronger than that of the first section portion 321 by increasing the amount of compression of the second section portion 322 against the insulating sealing structure 8 compared to that of the first section portion 321. Also, for example, the degree of pressure of the second section portion 322 against the insulating sealing structure 8 is made stronger than that of the first section portion 321 by increasing the mass per unit area of ​​the second section portion 322 compared to that of the first section portion 321. Examples of each are given below.

[0077] In some embodiments, the second section 322 is compressed against the insulating and sealing structure 8 by a larger amount than the first section 321, i.e., the second section 322 is compressed against the insulating and sealing structure 8 by a larger amount than the first section 321, thereby realizing that the second section 322 presses against the insulating and sealing structure 8 to a greater extent than the first section 321. As shown in FIGS. 6 and 7 , the insulating and sealing structure 8 includes a first portion 821 provided opposite the first section 321 in the axial direction of the mounting hole 12, and a second portion 822 provided opposite the second section 322 in the axial direction of the mounting hole 12. If the second portion 822 is compressed by a larger amount than the first portion 821, it may be interpreted that the second section 322 is compressed against the insulating and sealing structure 8 by a larger amount than the first section 321.

[0078] Here, since the compression amount of the second section portion 322 against the insulating sealing structure 8 is greater than that of the first section portion 321, when the compression amount of the first section portion 321 against the corresponding portion of the insulating sealing structure 8 (e.g., the first portion 821) meets the requirement, a compression allowance occurs in the compression amount of the second section portion 322 against the corresponding portion of the insulating sealing structure 8 (e.g., the second portion 822), and the degree of pressure of the second section portion 322 against the insulating sealing structure 8 is stronger than that of the first section portion 321. In this way, when the second section portion 322 warps, the compression allowance compensates for the loss of compression amount due to the warping of the second section portion 322, so that the compression amount of the warped second section portion 322 against the insulating sealing structure 8 still meets the compression amount requirement, thereby improving the sealing between the case 1 and the pole 2, mitigating leakage problems, and improving the reliability of the battery cell 102.

[0079] In some embodiments, the second section portion 322 protrudes toward the first case wall 13 relative to the first section portion 321, i.e., the surface of the second section portion 322 closer to the first case wall 13 (i.e., the second surface 3221 of the second section portion 322) is closer to the first case wall 13 than the surface of the first section portion 321 closer to the first case wall 13 (i.e., the first surface 3211 of the first section portion 321). As a result, by protruding the second section portion 322 in a direction approaching the first case wall 13, it is easy to achieve a greater compression amount of the second section portion 322 against the insulating sealing structure 8 than that of the first section portion 321, and a certain compression allowance can be left.In this way, when the second section portion 322 warps, the compression allowance and the loss of compression amount due to the warping of the second section portion 322 are offset, and the compression amount of the second section portion 322 against the insulating sealing structure 8 can still be sufficient to maintain sealing performance, thereby improving the problem of reduced sealing performance between the case 1 and the pole 2 due to the warping of the second section portion 322.

[0080] Of course, the present application is not limited thereto. For example, in another embodiment of the present application, the second surface 3221 of the second section portion 322 may be flush with the first surface 3211 of the first section portion 321. In this case, the insulating sealing structure 8 may be provided as follows: before installation, the surface of the second portion 822 facing the second section portion 322 is provided to protrude relative to the surface of the first portion 821 facing the first section portion 321. After installation, the surface of the second portion 822 facing the second section portion 322 is compressed until it is flush with the surface of the first portion 821 facing the first section portion 321. This indicates that the degree of compression of the second portion 822 is stronger than that of the first portion 821. In this case, it is also possible to achieve a greater compression amount of the second section portion 322 against the insulating sealing structure 8 than that of the first section portion 321. In this way, a certain amount of compression allowance can be left in the second portion 822, and when the second section portion 322 warps, the compression allowance and the loss of compression due to the warping of the second section portion 322 are offset, so that the amount of compression of the second section portion 322 against the insulating sealing structure 8 is still sufficient to maintain sealing performance, and the problem of reduced sealing performance between the case 1 and the pole 2 due to the warping of the second section portion 322 can be improved.

[0081] 6 and 7 , in some embodiments, the thickness W2 of the second section 322 in the axial direction of the mounting hole 12 is greater than the thickness W1 of the first section 321 in the axial direction of the mounting hole 12. For example, if the thickness of the second section 322 is increased in the direction approaching the first case wall 13, the second section 322 can be made to protrude relative to the first section 321 in the direction approaching the first case wall 13. This makes it easy to achieve a greater compression amount of the second section 322 relative to the insulating sealing structure 8 than the first section 321. This leaves a certain compression allowance to compensate for the loss of compression due to warping of the second section 322, and improves the problem of reduced sealing performance between the case 1 and the terminal post 2 due to warping of the second section 322. Furthermore, for example, if the direction of thickness increase of the second section portion 322 is not limited, if the materials of the first section portion 321 and the second section portion 322 are the same or have similar densities, it will help to achieve a mass per unit area of ​​the second section portion 322 that is greater than that of the first section portion 321, which will help to improve the warping resistance of the second section portion 322.Furthermore, the degree of warping of the second section portion 322 will be reduced, and the problem of a large degree of warping of the second section portion 322 making it unable to press the insulating sealing structure 8 firmly, resulting in poor sealing between the pole 2 and the case 1, will be improved.

[0082] 6 and 7 , in some embodiments, the surface of the first section portion 321 closer to the first case wall 13 (i.e., the first surface 3211 of the first section portion 321) is configured to extend at an angle in a direction away from the central axis L of the mounting hole 12 and closer to the first case wall 13. This solves the problem of a large step being formed at the connection between the surface of the first section portion 321 closer to the first case wall 13 (i.e., the first surface 3211 of the first section portion 321) and the surface of the second section portion 322 closer to the first case wall 13 (i.e., the second surface 3221 of the second section portion 322) when the second section portion 322 protrudes closer to the first case wall 13 relative to the first section portion 321, thereby improving the problem of cracking due to large deformation and improving the structural reliability of the first extension portion 32.

[0083] In some embodiments, as shown in Figures 6 and 7, the surface of the second section portion 322 closer to the first case wall 13 (i.e., the second surface 3221 of the second section portion 322) is structured parallel to the plane of the first case wall 13, which makes processing easier, effectively controls the amount of compression on the insulating sealing structure 8, and improves the cracking problem of the insulating sealing structure 8.

[0084] 6 and 7, when the first surface 3211 extends at an angle in a direction away from the central axis L of the mounting hole 12 toward the first case wall 13, the first surface 3211 and the second surface 3221 are connected by a line or a chamfer (for example, an R-chamfer or a C-chamfer). This prevents a step from being formed at the connection between the first surface 3211 and the second surface 3221, improving the problem of the first extension portion 32 tearing at the connection, while improving the problem of the insulating sealing structure 8 tearing due to concentrated force at a location corresponding to the connection, thereby providing an effect of protecting the insulating sealing structure 8.

[0085] In some embodiments, when the second section 322 protrudes relative to the first section 321 in a direction approaching the first case wall 13, the second section 322 can be configured so that its thickness W2 in the axial direction of the mounting hole 12 is greater than the thickness W1 of the first section 321 in the axial direction of the mounting hole 12. Here, if the thickness is not a constant value, the average thickness may be used as the thickness.

[0086] This increases the thickness of the second section portion 322 and limits the direction of increase in thickness of the second section portion 322 to the direction facing the first case wall 13, thereby increasing the amount of compression of the second section portion 322 against the insulating sealing structure 8 and leaving a certain compression allowance to compensate for the loss of compression due to warping of at least a portion of the second section portion 322.Increasing the mass of the second section portion 322 not only improves the warping resistance of the second section portion 322, but also reduces the degree of warping of the second section portion 322, thereby alleviating the problem of insufficient compression of the insulating sealing structure 8 due to warping of the second section portion 322 and improving the sealing between the pole 2 and the case 1.

[0087] For example, the surface of the second section portion 322 facing away from the first case wall 13 (i.e., the fourth surface 3222 of the second section portion 322) may be made flush with the surface of the first section portion 321 facing away from the first case wall 13 (i.e., the third surface 3212 of the first section portion 321), thereby simplifying the structure and processing of the first extension portion 32. For example, a first extension portion 32 processed using a riveting method has the third surface 3212 and the fourth surface 3222 flush with each other, and the thickness of the second section portion 322 in the axial direction of the mounting hole 12 is made larger than the thickness of the first section portion 321 in the axial direction of the mounting hole 12, making it easy to make the second section portion 322 protrude in a direction approaching the first case wall 13 relative to the first section portion 321.

[0088] Naturally, the present application is not limited to this, and for example, in other embodiments of the present application, the fourth surface 3222 of the second section portion 322 may be configured to protrude from the third surface 3212 of the first section portion 321 in a direction away from the first case wall 13, or the fourth surface 3222 of the second section portion 322 may be configured to be recessed into the third surface 3212 of the first section portion 321 in a direction approaching the first case wall 13, thereby achieving the following: "the thickness of the second section portion 322 in the axial direction of the mounting hole 12 is made greater than the thickness of the first section portion 321 in the axial direction of the mounting hole 12, and the second section portion 322 protrudes relative to the first section portion 321 in a direction approaching the first case wall 13."

[0089] 6 and 7 , the first extension portion 32 abuts against and fits into the first case wall 13 over at least half of the dimension extending in the direction away from the central axis L of the mounting hole 12. Here, abutting and fitting refers to indirect contact via the insulating sealing structure 8. Specifically, with the axial direction of the mounting hole 12 defined as the projection direction and a plane perpendicular to the axial direction of the mounting hole 12 defined as the projection plane, the projection of the first extension portion 32 on the projection plane and the projection of the first case wall 13 on the projection plane have an overlapping region, and the portion of the first extension portion 32 corresponding to the overlapping region abuts against and fits into the first case wall 13.

[0090] 7, for example, the radial dimension of the mounting hole 12 at the portion of the first extension 32 corresponding to the overlapping region is L3, and the radial dimension of the mounting hole 12 of the first extension 32 is L0, where L3≧L0 / 2 (as shown in FIG. 7). It should be noted that the shape of the mounting hole 12 is not limited and may be, for example, circular, rectangular, elliptical, racetrack-shaped, etc., and for non-circular mounting holes 12, the radial direction of the mounting hole 12 may include the width and length directions of the mounting hole 12.

[0091] In short, by having at least half of the first extension portion 32 in the extension direction abut and fit against the first case wall 13, the first extension portion 32 has a long dimension that abuts and fits against the first case wall 13, thereby effectively pressing the insulating sealing structure 8 and improving the reliability of the seal.

[0092] In some embodiments, as shown in FIGS. 6 and 7 , the dimension of the portion of the first extension 32 that abuts against the first case wall 13 extending in a direction away from the central axis L of the mounting hole 12 is L3, and the thickness of the first case wall 13 is D, where 0.5D≦L3≦2D. As a result, the dimension of the portion of the first extension 32 that abuts against the first case wall 13 is close to or exceeds the thickness of the first case wall 13, and the first extension 32 has a long dimension that abuts against the first case wall 13, which can effectively press the insulating sealing structure 8 and improve the reliability of the seal.

[0093] In some embodiments, as shown in FIGS. 6 and 7, the dimension extending in a direction away from the central axis L of the mounting hole 12 of the first section 321 is L1, the dimension extending in a direction away from the central axis L of the mounting hole 12 of the second section 322 is L2, and the inclination of the mounting hole 12 in the axial direction of the first surface 3211 is H. Here, L2 is not more than twice H, that is, L2≤2H. Thereby, the deformation of the surface on the side facing the insulating and sealing structure 8 of the first extending portion 32 becomes gentle, and the problem of cracking of the insulating and sealing structure 8 can be effectively suppressed.

[0094] In some embodiments, as shown in FIGS. 6 and 7, by H≤L1 / 2, it is possible to prevent the inclination of the first surface 3211 from becoming too large. Since the structural reliability of the first section 321 is high, the second section 322 and the insertion portion 33 can be reliably connected, and the reliability of the pressing of the first extending portion 32 against the insulating and sealing structure 8 is improved. Further, the inclination angle of the first surface 3211 does not become too large, the local pressure on the insulating and sealing structure 8 is reduced, and the problem of cracking of the insulating and sealing structure 8 can be improved.

[0095] In some embodiments, as shown in FIGS. 6 and 7, by L1<L2, the dimension of the second section 322 becomes larger than that of the first section 321, the second section 322 is less likely to warp, and further the second section 322 can more easily press the insulating and sealing structure 8 than the first section 321, enhancing the degree of pressing of the second section 322 against the insulating and sealing structure 8 and helping to more effectively improve the problem of insufficient pressing amount of the insulating and sealing structure 8 due to warping of the second section 322. Further, since the dimension of the second section 322 is larger than that of the first section 321, when the degree of pressing of the second section 322 against the insulating and sealing structure 8 is stronger than that of the first section 321, the pressure of the second section 322 against the insulating and sealing structure 8 can be reduced, and the problem of cracking of the insulating and sealing structure 8 can be improved.

[0096] 6 and 7 , the first extension 32 has a radial dimension L0 of the mounting hole 12, and the second section 322 has an axial thickness W2 of the mounting hole 12, where L0≧1 mm and W2≧0.5 mm. For example, L0 is 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, or 2 mm, and W2 is 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm. This allows the first extension 32 to have a relatively large extension dimension constituting the second section 322, and the thickness of the second section 322 to be relatively large. This allows the second section 322 to effectively abut and fit against the first case wall 13, more effectively pressing against the insulating sealing structure 8, and improving sealing reliability.

[0097] When the pole body 3 is welded to the pole cover plate 4, if the weld bead solidifies and shrinks, the edge of the first extension portion 32 is likely to be warped and deformed, reducing the amount of compression of the outer annular portion of the insulating sealing structure 8, resulting in poor sealing and making leakage more likely to occur. In contrast, in some embodiments of the present application, by limiting the dimensions and shape of the first extension portion 32 as described above, the first extension portion 32 is formed into a shape that is longer in the direction away from the central axis L of the mounting hole 12 and has an edge that protrudes toward the first case wall 13 and becomes thicker. This increases the amount of compression of the first extension portion 32 against the edge insulating sealing structure 8 and leaves a certain compression allowance. When the edge of the first extension portion 32 warps due to the effects of welding, the compression allowance compensates for the loss of compression due to the edge warping of the first extension portion 32, so that the amount of compression of the insulating sealing structure 8 can still be sufficient. This solves the problem of the edge of the first extension portion 32 warping significantly due to solidification and thermal contraction of the weld bead, resulting in insufficient compression of the seal ring and poor sealing.

[0098] In some embodiments, as shown in Figures 6 and 7, the pole post 2 further includes a second extension portion 38 connected to the insertion portion 33 and extending in a direction away from the central axis L of the mounting hole 12 relative to the insertion portion 33, and the second extension portion 38 and the first extension portion 32 extend on both the inner and outer sides of the first case wall 13, i.e., when the first extension portion 32 extends outward from the outer surface of the first case wall 13, the second extension portion 38 extends inward from the inner surface of the first case wall 13, and when the first extension portion 32 extends inward from the inner surface of the first case wall 13, the second extension portion 38 extends outward from the outer surface of the first case wall 13. The insulating sealing structure 8 includes a first insulating sealing member 81 arranged at least partially between the first extension portion 32 and the first case wall 13, and a second insulating sealing member 82 arranged at least partially between the second extension portion 38 and the first case wall 13, the first insulating sealing member 81 and the second insulating sealing member 82 being two parts, and the material hardness of the first insulating sealing member 81 being higher than the material hardness of the second insulating sealing member 82.

[0099] In this way, the pressing force applied by the first extension portion 32 to the first insulating sealing member 81 can be effectively transmitted to the second insulating sealing member 82, thereby enabling the second insulating sealing member 82 to be effectively compressed, and the compression amount of the first insulating sealing member 81 can be made smaller than the compression amount of the second insulating sealing member 82, allowing both the first insulating sealing member 81 and the second insulating sealing member 82 to effectively perform sealing. It should also be noted that when the insulating sealing structure 8 includes the first insulating sealing member 81 and the second insulating sealing member 82, the compression amount of the second section portion 322 relative to the insulating sealing structure 8 that is greater than that of the first section portion 321 can also be interpreted as the compression amount of the second section portion 322 relative to the second insulating sealing member 82 being greater than that of the first section portion 321.

[0100] In some embodiments, as shown in FIGS. 6 and 7 , when the material hardness of the first insulating sealing member 81 is higher than that of the second insulating sealing member 82, the surface of the first insulating sealing member 81 facing away from the first case wall 13 and the surface of the first extension portion 32 facing toward the first case wall 13 can be made to match each other to increase the contact area between the first insulating sealing member 81 and the first extension portion 32, thereby reducing the problem of the first insulating sealing member 81 tearing due to locally concentrated acting force. When the first section 321 protrudes toward the first case wall 13, the matching shape forms a concave-convex fit between the first extension 32 and the first insulating sealing member 81, which can exert a positioning effect. This is advantageous in reducing the problem of play and detachment of the first insulating sealing member 81 during vibration or impact of the battery cell 102, and the first insulating sealing member 81 will not escape from the sealing fit position, which improves the installation stability of the first insulating sealing member 81 and ensures that the first insulating sealing member 81 achieves a reliable insulating sealing effect.

[0101] In some embodiments of the present application, as shown in Figures 6 and 7, the pole 2 includes a pole body 3 and a pole cover plate 4, the pole body 3 includes a first extension portion 32 and a second extension portion 38, the first extension portion 32 extends outside the outer surface of the first case wall 13, the pole cover plate 4 covers the outside of the pole body 3, and the pole body 3 is welded to the pole cover plate 4.

[0102] As a result, by covering the outside of the pole body 3 with the pole cover plate 4, the pole cover plate 4 is positioned closer to the first extension portion 32 than to the second extension portion 38, and the heat generated by welding the pole cover plate 4 to the pole body 3 is transferred more to the first insulating sealing member 81 than to the second insulating sealing member 82. Since the material hardness of the first insulating sealing member 81 is higher than that of the second insulating sealing member 82, the heat resistance of the first insulating sealing member 81 is stronger than that of the second insulating sealing member 82. For example, since the first insulating sealing member 81 is made of a plastic material and the second insulating sealing member 82 is made of a rubber material, the thermal influence on the second insulating sealing member 82 when the pole body 3 and the pole cover plate 4 are welded together can be reduced as much as possible, improving the sealing reliability between the first case wall 13 and the pole 2.

[0103] In some embodiments of the present application, as shown in FIG. 8 , the first extension portion 32 protrudes from the insertion portion 33 to the outside of the first case wall 13, and a countersunk groove 31 is defined between the first extension portion 32 and the insertion portion 33. The edge of the pole post cover plate 4 is provided in the countersunk groove 31 and is welded to the insertion portion 33 through-welded, and the welded structure formed by welding is spaced apart from the first extension portion 32.

[0104]

[0023] As a result, the shrinkage stress caused by solidification of the molten pool formed by welding can be blocked by the above gap and is hardly or only little transmitted to the first extension portion 32, thereby improving the warpage problem of the first extension portion 32 and allowing the first extension portion 32 to firmly press the insulating sealing structure 8 and improve the insulating sealing effect. In addition, because the edge of the electrode post cover plate 4 is disposed within the counterbore groove 31 and is not butt-welded to the first extension portion 32 but is penetration-welded to the insertion portion 33, it is not necessary to ensure a small installation gap between the edge of the electrode post cover plate 4 and the first extension portion 32 to meet the requirements for butt welding. As a result, the gap between the edge of the electrode post cover plate 4 and the first extension portion 32 can be made larger, which further improves the compatibility of the electrode post body 3 and helps to lower the processing accuracy requirements for the electrode post cover plate 4 and the electrode post body 3.

[0105] 9 and 10, the first extension portion 32 is formed on the terminal post 2 by burring and crimping. For example, FIG. 9 shows the terminal post 2 in a state before riveting, and FIG. 10 shows the terminal post 2 in a state after riveting. Specifically, after the terminal post 2 is attached to the mounting hole 12 by the insertion portion 33, the first extension portion 32 is produced by a burring and crimping process. This makes it easier to process the terminal post 2 and helps improve the connection reliability between the first extension portion 32 and the insertion portion 33, thereby improving the attachment reliability between the terminal post 2 and the first case wall 13.

[0106] For example, before the first extension portion 32 is riveted, the first extension portion 32 may be structured so that the outer surface of its outer end is relatively protruding, and after the first extension portion 32 is burred and crimped, the resulting third surface 3212 of the first section portion 321 and the fourth surface 3222 of the second section portion 322 are flush, and the second surface 3221 of the second section portion 322 protrudes toward the first case wall 13 relative to the first surface 3211 of the first section portion 321. In this way, at the same time as the burring and crimping, the amount of compression of the second section portion 322 with respect to the insulating sealing structure 8 can be greater than that of the first section portion 321. As a result, the insulating sealing structure 8 can easily obtain a compression allowance at the location corresponding to the second section portion 322, and the problem of poor sealing due to warping of the second section portion 322 is improved.

[0107] Of course, the present application is not limited to this, and for example, in other embodiments of the present application, the terminal post 2 may be formed by welding two parts together, for example, the two parts may be respectively attached to the mounting holes 12 and then welded together. Even when the terminal post 2 is attached to the first case wall 13 by a method other than riveting, the phenomenon of pressing the insulating sealing structure 8 similarly occurs.

[0108] In some embodiments of the present application, the mass per unit area of ​​the second section portion 322 may be made greater than the mass per unit area of ​​the first section portion 321, i.e., the mass per unit area of ​​the second section portion 322 may be made greater than that of the first section portion 321, thereby realizing that the second section portion 322 presses against the insulating sealing structure 8 to a greater extent than the first section portion 321. Here, because the mass per unit area of ​​the second section 322 is greater than that of the first section 321, the second section 322 is more resistant to warping than the first section 321, and the second section 322 can exert a stronger pressure on the insulating sealing structure 8 than the first section 321. In this way, the degree of warping of the second section 322 is reduced to a certain extent, and the problem of poor sealing between the pole 2 and the case 1 due to a large degree of warping of the second section 322, which is unable to press firmly against the insulating sealing structure 8, can be solved. This improves the sealing between the case 1 and the pole 2, alleviates leakage problems, and improves the reliability of the battery cell 102.

[0109] It should be noted that when the mass per unit area of ​​the second section portion 322 is greater than that of the first section portion 321, the amount of compression of the second section portion 322 against the insulating sealing structure 8 is not necessarily greater than that of the first section portion 321. Here, when the amount of compression of the second section portion 322 against the insulating sealing structure 8 is made greater than that of the first section portion 321 and the mass per unit area of ​​the second section portion 322 is made greater than that of the first section portion 321, it is possible to more effectively achieve a stronger degree of pressure on the insulating sealing structure 8 of the second section portion 322 than that of the first section portion 321. As a result, by making the mass per unit area of ​​the second section 322 greater than that of the first section 321, it is easy to achieve a greater compression amount of the second section 322 relative to the insulating sealing structure 8 than that of the first section 321. This not only makes it possible to compensate for the loss of compression amount due to warping of the second section 322 through the compression allowance, but also reduces the degree of warping of the second section 322, more effectively improving the sealing between the case 1 and the pole 2, alleviating leakage problems, and improving the reliability of the battery cell 102.

[0110] In some embodiments, the thickness of the second section 322 is greater than the thickness of the first section 321, and / or the density of the second section 322 is greater than the density of the first section 321, i.e., at least one of the thickness and density of the second section 322 is greater than that of the first section 321, i.e., the density of the second section 322 is greater than the density of the first section 321, or the thickness of the second section 322 is greater than the thickness of the first section 321, or the density and thickness of the second section 322 are greater than the density and thickness of the first section 321, respectively. Here, the thickness is the dimension along the axial direction of the mounting hole 12, and if the thickness is not a constant value, the thickness refers to the average thickness.

[0111] As a result, by making at least one of the thickness and density of the second section portion 322 greater than that of the first section portion 321, it is easy to achieve a mass per unit area of ​​the second section portion 322 greater than that of the first section portion 321, thereby reducing the structural complexity of the first extension portion 32 and the difficulty of designing and processing the first extension portion 32.

[0112] Of course, the present application is not limited to this, and for example, in other embodiments of the present application, the mass per unit area of ​​the second section portion 322 may be greater than that of the first section portion 321 by making the second section portion 322 or the first section portion 321 a composite structure consisting of multiple parts, or by hollowing out a portion of the first section portion 321.

[0113] In some embodiments, the first section portion 321 and the second section portion 322 are made of the same material, the surface of the second section portion 322 facing away from the first case wall 13 is flush with the surface of the first section portion 321 facing away from the first case wall 13, and the second section portion 322 protrudes relative to the first section portion 321 in a direction toward the first case wall 13. By making the second section portion 322 protrude toward the first case wall 13 and increasing its thickness, it is easy to achieve a mass per unit area of ​​the second section portion 322 that is greater than that of the first section portion 321. This not only increases the amount of compression of the second section portion 322 with respect to the corresponding portion of the insulating sealing structure 8, but also improves the warping resistance of the second section portion 322 and further reduces the degree of warping of the second section portion 322. This also alleviates the problem of a high degree of warping of the second section portion 322 preventing it from firmly pressing against the insulating sealing structure 8, resulting in poor sealing between the pole 2 and the case 1.

[0114] 5 and 6 , in some embodiments of the present application, the battery cell 102 has an accommodating cavity 11 formed inside the first case wall 13, the pole 2 includes a pole body 3, the pole body 3 has an accommodating groove 36 that opens in a direction away from the accommodating cavity 11, and the pole body 3 has a communication hole 37 that passes through the groove wall of the accommodating groove 36 on the side closer to the accommodating cavity 11, connecting the accommodating cavity 11 to the accommodating groove 36. For example, if the insertion portion 33 is annular, the accommodating groove 36 may be located in the inner annular region of the insertion portion 33, and the accommodating groove 36 may be defined by the insertion portion 33 and a support portion 39 located in the inner annular region of the insertion portion 33.

[0115] As a result, when injecting electrolyte into the battery cell 102, the electrolyte can be injected into the accommodating groove 36 and then flow into the accommodating cavity 11 through the communication hole 37. Here, the accommodating groove 36 serves to temporarily store the electrolyte, thereby eliminating problems such as spillage and leakage of the electrolyte. In addition, the side walls of the accommodating groove 36 (i.e., the groove walls extending from the opening of the accommodating groove 36 toward the accommodating cavity 11) can prevent electrolyte spillage to a certain extent, reducing external contamination caused by the electrolyte and facilitating rapid injection. Furthermore, because there is no need to separately create an injection passage in the case 1, special processing of the case 1 is not required, which helps reduce the structural complexity and processing difficulty of the case 1.

[0116] In some embodiments of the present application, as shown in FIGS. 5 and 6 , a battery cell 102 includes a cell assembly 7, and the cell assembly 7 includes an active material coated portion 71 accommodated in the accommodating cavity 11 and a conductive portion 72 connected to the active material coated portion 71. The conductive portion 72 is inserted into the communicating hole 37 so as to be at least partially accommodated in the accommodating groove 36. It should be noted that there may be one or more communicating holes 37, and the conductive portion 72 may be inserted into at least one of the communicating holes 37. Exemplarily, at least one communicating hole 37 allows the electrolyte to flow through. For example, at least one communicating hole 37 may be open (i.e., not having the conductive portion 72 inserted therethrough), thereby allowing the electrolyte to flow without being obstructed by the conductive portion 72. Alternatively, at least one communicating hole 37 may allow the electrolyte to flow even if the conductive portion 72 is inserted therethrough.

[0117] As a result, by accommodating at least a portion of the conductive portion 72 within the accommodating groove 36, at least a portion of the conductive portion 72 occupies the space within the accommodating groove 36, reducing the space occupied by the conductive portion 72 within the accommodating cavity 11 and saving space within the accommodating cavity 11 to accommodate an active material coating portion 71 with a larger volume, which is advantageous for improving the energy density of the battery cell 102, or for reducing the dimensions of the battery cell 102 when the energy density of the battery cell 102 remains unchanged.

[0118] It is understood that the active material coating portion 71 may include a current collector coated with an active material layer, and the conductive portion 72 may include only a tab portion, or may include a tab portion and an adapter sheet electrically connected to the tab portion, and is not limited thereto.

[0119] In some embodiments, the conductive portion 72 is welded to the pole body 3 to form an electrical connection, thereby realizing electrode output from the pole body 3 of the cell assembly 7. For example, as shown in FIG. 6 , the conductive portion 72 is welded to the groove wall of the receiving groove 36 on the side closer to the receiving cavity 11, thereby improving the fitting compactness and facilitating the welding operation between the two. Of course, the present application is not limited thereto, and in other embodiments, the conductive portion 72 may be welded to the pole cover plate 4 to form an electrical connection, and is not limited thereto.

[0120] In some embodiments of the present application, as shown in FIGS. 5 and 6 , the pole 2 includes a pole cover plate 4 covering the pole body 3, the pole cover plate 4 is formed with an inlet hole 43 that can communicate with the receiving groove 36, and the battery cell 102 further includes a sealing structure 6 for sealing the inlet hole 43.

[0121] In this way, when it is desired to inject electrolyte into the battery cell 102, the sealing structure 6 is not attached to the liquid inlet 43 for the time being, or the sealing structure 6 is set to an open state for the liquid inlet 43, and at this time, the electrolyte can be injected into the accommodating groove 36 through the liquid inlet 43. After the liquid is injected, the sealing structure 6 can be attached to the liquid inlet 43, or the sealing structure 6 can be switched to a closed state for the liquid inlet 43, thereby sealing the liquid inlet 43. This prevents leakage of the electrolyte and also prevents external foreign matter from entering the accommodating cavity 11 through the liquid inlet 43, improving the reliability of the battery cell 102.

[0122] As a result, by processing the liquid injection hole 43 in the pole cover plate 4 and opening the hole relatively small and close to the outside, the sealing structure 6 can easily achieve reliable sealing of the liquid injection inlet, improving the operational reliability of the battery cell 102 and enabling flexible and diverse designs of the sealing structure 6.

[0123] 6, the electrode post cover plate 4 does not have a portion that abuts the outside of the sealing structure 6 (i.e., the side away from the receiving cavity 11), so the sealing structure 6 is suitable for being attached to the electrode post cover plate 4 from the outside of the electrode post cover plate 4 (i.e., the side away from the receiving cavity 11). In this way, by attaching the sealing structure 6 to the electrode post cover plate 4 from the outside of the electrode post cover plate 4 to seal the liquid inlet hole 43, the sealing structure 6 can be attached after liquid is injected, ensuring the sealing of the liquid inlet hole 43, and the attachment position is close to the outside, facilitating quick installation of the sealing structure 6. In addition, the attachment of the sealing structure 6 does not adversely affect the connection between the electrode post body 3 and the electrode post cover plate 4, ensuring the reliability of the connection between the electrode post body 3 and the electrode post cover plate 4.

[0124] Here, the sealing structure 6 may be detachable or may be fixed and non-detachable. For example, if the sealing structure 6 is detachable, it is convenient to maintain the inlet hole 43. For example, when it is necessary to replenish the electrolyte, the sealing structure 6 may be removed, the inlet hole 43 may be opened, and the electrolyte may be refilled into the receiving cavity 11 through the inlet hole 43, and then the sealing structure 6 may be reattached. Alternatively, the sealing structure 6 may be detachably connected to the pole cover plate 4 by, for example, a screw or a rotary engagement to facilitate attachment and detachment.

[0125] For example, if the sealing structure 6 is in a fixed and non-removable form, the sealing structure 6 may be fixed to the pole post cover plate 4 by welding, riveting, or other methods to improve the sealing reliability of the sealing structure 6 to the liquid inlet hole 43. For example, the liquid inlet hole 43 may be in a multi-stage form, and the sealing structure 6 may include a first sealing member 61 press-fitted into the liquid inlet hole 43 and a second sealing member 62 covered on the outside of the first sealing member 61 and welded to the pole post cover plate 4.

[0126] Alternatively, in some embodiments, the second sealing member 62 may be removably connected to the pole cover plate 4 in a rotational engagement manner to restrict the first sealing member 61 to a tight fit position in the injection hole 43.

[0127] 6 , at least a portion of the sealing structure 6 is fitted into the liquid inlet 43. That is, the sealing structure 6 may be fitted entirely or only partially into the liquid inlet 43. This makes full use of the space within the liquid inlet 43, improving the sealing reliability of the sealing structure 6 for the liquid inlet 43. On the other hand, the height of the sealing structure 6 protruding out of the liquid inlet 43 can be reduced, reducing the space outside the electrode post cover plate 4 that the sealing structure 6 occupies. This helps to reduce interference and influence on the current collecting member 103, increases the contact area between the current collecting member 103 and the electrode post cover plate 4, and improves current passing efficiency.

[0128] In some embodiments of the present application, the first case wall 13 is an integrally molded cover plate, or as shown in Figure 5, the case 1 further includes a second case wall 14, where the first case wall 13 is integrally molded with at least one second case wall 14, and the second case wall 14 extends to one side in the thickness direction of the first case wall 13. This allows for flexible design of the structural position of the pole 2 and expands the application range of the battery cell 102 in the embodiments of the present application.

[0129] It should be noted that the second case wall 14 may extend from an edge of the first case wall 13, and if the first case wall 13 is rectangular, at least one of the four edges of the first case wall 13 may extend from the second case wall 14; for example, only one edge of the first case wall 13 may extend from the second case wall 14, or only two edges of the first case wall 13 may extend from each of the second case walls 14, or three edges of the first case wall 13 may extend from each of the second case walls 14, or all four edges of the first case wall 13 may extend from the second case wall 14. For example, if the case 1 is a rectangular case, any wall of the rectangular case may be the first case wall 13.

[0130] For example, the case 1 may include a case body and a cover plate, the case body defining a space open on one side, and the cover plate being provided on the open side of the case body so that a storage cavity 11 is formed between the case body and the cover plate. In this case, the surface of the case body facing the cover plate is the first case wall 13, and the wall surface connected between the first case wall 13 of the case body and the cover plate is the second case wall 14, or the surface of the case body facing the cover plate is the second case wall 14, and the wall surface connected between the second case wall 14 of the case body and the cover plate is the first case wall 13, or the cover plate is the first case wall 13; either is possible.

[0131] According to a second embodiment of the present application, the present application further provides a battery 100 including the battery cell 102 according to any of the above solutions. It should be noted that the battery 100 according to the embodiment of the present application may or may not include a box, which improves the reliability of the battery cell 102 according to the embodiment of the present application and thus helps to improve the performance of the battery 100.

[0132] 11 , the battery 100 may further include a current collecting member 103, and the battery 100 may include a plurality of battery cells 102, with at least two of the battery cells 102 being electrically connected via the current collecting member 103. This allows the plurality of battery cells 102 to be connected in series and / or in parallel. For example, when the plurality of battery cells 102 are connected in series, the positive electrode post cover plate 4 of one battery cell 102 and the negative electrode post cover plate 4 of the next battery cell 102 are connected via one current collecting member 103, and the negative electrode post cover plate 4 of the battery cell 102 and the positive electrode post cover plate 4 of the previous battery cell 102 are connected via another current collecting member 103.

[0133] According to a third embodiment of the present application, an embodiment of the present application further provides an electric device including the battery 100 according to any of the above solutions, the battery 100 being for providing electric energy to the electric device. The electric device may be a device or system using any of the above-mentioned batteries 100. The improved performance of the battery 100 helps to improve the operating power performance of the electric device.

[0134] A battery cell 102 according to a specific embodiment of the present application will be described below.

[0135] The battery cell 102 includes a case 1, a pole 2, and an insulating sealing structure 8. The case 1 includes a first case wall 13, which has a mounting hole 12. The pole 2 includes a pole body 3 and a pole cover plate 4, which covers the outside of the pole body 3. The pole body 3 includes an insertion portion 33 inserted into the mounting hole 12, a first extension portion 32 connected to the insertion portion 33 and extending in a direction away from the central axis L of the mounting hole 12 with respect to the insertion portion 33, and a second extension portion 38 connected to the insertion portion 33 and extending in a direction away from the central axis L of the mounting hole 12 with respect to the insertion portion 33, the first extension portion 32 extending outward from the outer surface of the first case wall 13 and the second extension portion 38 extending inward from the inner surface of the first case wall 13, and the first extension portion 32 is formed on the pole 2 by burring caulking.

[0136] The first extension portion 32 includes a first section portion 321 and a second section portion 322 arranged in sequence in a direction away from the central axis L of the mounting hole 12, and the thickness of the second section portion 322 in the axial direction of the mounting hole 12 is greater than the thickness of the first section portion 321 in the axial direction of the mounting hole 12, the surface of the first section portion 321 closer to the first case wall 13 is a first surface 3211, and the surface of the second section portion 322 closer to the first case wall 13 is a second surface 3221, where the first surface 3211 extends in a direction away from the central axis L of the mounting hole 12 at an incline in a direction approaching the first case wall 13, the second surface 3221 is parallel to the first case wall 13, and the first surface 3211 and the second surface 3221 are linearly connected so that the second surface 3221 protrudes in a direction approaching the first case wall 13 relative to the first surface 3211. For example, before riveting the pole post 2, the portion corresponding to the first extension portion 32 may be formed into a trapezoidal shape, and after riveting, the second section portion 322 will protrude in a direction approaching the first case wall 13 relative to the first section portion 321.

[0137] The insertion portion 33 and the first extension portion 32 form a first pole portion, and the insulating sealing structure 8 includes a first insulating sealing member 81 fitted between the first pole portion and the first case wall 13, and the insertion portion 33 and the second extension portion 38 form a second pole portion, and the insulating sealing structure 8 includes a second insulating sealing member 82 fitted between the second pole portion and the first case wall 13, and the second insulating sealing member 82 and the first insulating sealing member 81 are provided separately. The first insulating sealing member 81 is a plastic member, and the second insulating sealing member 82 is a rubber member. The material hardness of the first insulating sealing member 81 is higher than the material hardness of the second insulating sealing member 82. The surface of the first insulating sealing member 81 facing away from the first case wall 13 and the surface of the first extension portion 32 facing the first case wall 13 have the same shape. The second insulating sealing member 82 includes a first portion 821 arranged opposite the first section portion 321 in the axial direction of the mounting hole 12, and a second portion 822 arranged opposite the second section portion 322 in the axial direction of the mounting hole 12.

[0138] When installing, the first insulating sealing member 81, the second insulating sealing member 82 and the pole body 3 may first be attached to the mounting hole 12 of the first case wall 13, and then the first extension portion 32 may be processed by a riveting process. At this time, the first extension portion 32 applies a force to the first insulating sealing member 81, and the first insulating sealing member 81 applies a force to the second insulating sealing member 82 through the first case wall 13. As a result, the second section portion 322 protrudes in a direction approaching the first case wall 13 relative to the first section portion 321, and the compression amount of the second portion 822 is greater than the compression amount of the first portion 821.

[0139] As a result, a certain compression allowance can be left in the insulating sealing structure 8 at a location corresponding to the second section 322. When the electrode post cover plate 4 and the electrode post body 3 are welded together and shrinkage and deformation occurs, causing warping of the second section 322, the compression allowance generated in the insulating sealing structure 8 at a location corresponding to the second section 322 compensates for the loss of compression caused by the warping of the second section 322, ensuring that the amount of compression in the location corresponding to the second section 322 of the insulating sealing structure 8 remains sufficient, improving sealing reliability and solving the problem of leakage caused by poor sealing due to excessive loss of compression. In addition, the surface of the first insulating sealing member 81 facing away from the first case wall 13 and the surface of the first extension portion 32 facing the first case wall 13 have the same shape, which helps to reduce play in the first insulating sealing member 81 in vibration and shock environments, improving the installation stability of the first insulating sealing member 81 and the reliability of the insulating sealing.

[0140] It should be noted that, unless contradictory, the embodiments and features in the embodiments in the present application can be combined with each other.

[0141] The above is only a preferred embodiment of the present application, and does not limit the present application. Those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall fall within the protection scope of the present application. [Explanation of symbols]

[0142] 1000 vehicles X 1st direction Y Second direction Z 3rd direction 100 batteries 200 Controller 300 motor Box 101 1011 First box body 1012 Second box body 102 battery cells 103 Current collecting member 1 case 11. Storage cavity 12 Mounting holes L center axis 13 First Case Wall 14 Second Case Wall 2 poles 3 Pole body 31 Counterbore 32 1st extension part 321 First Section 3211 1st surface 3212 Third surface 322 Second Section 3221 2nd surface 3222 4th surface 33 Insertion part 36 Storage groove 37 Communication hole 38 Second extension part 39 Support part 4 pole cover plate 43 Liquid injection hole 6 Sealing structure 61 First sealing member 62 Second sealing member 7 Cell Assembly 71 Active material coating section 72 Conductive part 8. Insulation sealing structure 81 First insulating sealing member 82 Second insulating sealing member 821 Part 1 822 Part 2.

Claims

1. a first case wall having a mounting hole formed therein; a pole post including an insertion portion inserted into the mounting hole and a first extending portion connected to the insertion portion and extending in a direction away from the central axis of the mounting hole with respect to the insertion portion, the first extending portion extending outward from the outer surface or inward from the inner surface of the first case wall; an insulating sealing structure that is fitted between the terminal post and the first case wall, the first extending portion including a first section portion and a second section portion that are provided in this order in a direction away from the central axis of the mounting hole, and the second section portion pressing against the insulating sealing structure to a greater extent than the first section portion; including a battery cell.

2. The battery cell according to claim 1 , wherein the second section compresses the insulating sealing structure to a greater extent than the first section compresses the insulating sealing structure.

3. 3. The battery cell of claim 2, wherein a surface of the first section portion closer to the first case wall is a first surface, a surface of the second section portion closer to the first case wall is a second surface, and the second surface protrudes from the first surface in a direction approaching the first case wall.

4. The battery cell according to claim 3 , wherein the first surface extends at an angle in a direction away from the central axis of the mounting hole and in a direction approaching the first case wall.

5. The battery cell according to claim 4 , wherein the first surface and the second surface are connected by a line or a chamfer.

6. The battery cell according to any one of claims 3 to 5, wherein the thickness of the second section in the axial direction of the mounting hole is greater than the thickness of the first section in the axial direction of the mounting hole.

7. The battery cell according to claim 6 , wherein a surface of the second section portion away from the first case wall is flush with a surface of the first section portion away from the first case wall.

8. The battery cell according to any one of claims 3 to 7, wherein the first extension portion abuts and fits into the first case wall over at least half of the dimension extending in the direction away from the central axis of the mounting hole.

9. 9. The battery cell of claim 2, wherein the electrode post further includes a second extending portion connected to the insertion portion and extending in a direction away from the central axis of the mounting hole relative to the insertion portion, the second extending portion and the first extending portion extending on both the inner and outer sides of the first case wall, the insulating sealing structure including a first insulating sealing member at least partially provided between the first extending portion and the first case wall, and a second insulating sealing member at least partially provided between the second extending portion and the first case wall, and wherein a material hardness of the first insulating sealing member is higher than a material hardness of the second insulating sealing member.

10. The battery cell according to claim 9 , wherein a surface of the first insulating sealing member facing away from the first case wall and a surface of the first extending portion facing the first case wall have the same shape.

11. 11. The battery cell of claim 9, wherein the pole includes a pole body and a pole cover plate, the pole body includes the first extension portion and the second extension portion, the first extension portion extends outside the outer surface of the first case wall, the pole cover plate covers the outside of the pole body, and the pole body is connected to the pole cover plate by welding.

12. 12. The battery cell of claim 11, wherein the first extension portion protrudes from the insertion portion to the outside of the first case wall, a countersunk groove is defined between the first extension portion and the insertion portion, an edge portion of the pole post cover plate is provided in the countersunk groove and is penetration-welded to the insertion portion, and a welded structure formed by welding is spaced apart from the first extension portion.

13. The battery cell according to any one of claims 1 to 12, wherein the first extension portion is formed on the electrode post by burring and caulking.

14. The battery cell according to any one of claims 1 to 13, wherein the mass per unit area of ​​the second section is greater than the mass per unit area of ​​the first section.

15. the thickness of the second section is greater than the thickness of the first section; and / or The battery cell of claim 14 , wherein the density of the second section is greater than the density of the first section.

16. 16. The battery cell according to claim 1, wherein an accommodating cavity is formed inside the first case wall of the battery cell, the pole includes a pole body, the pole body has an accommodating groove that opens in a direction away from the accommodating cavity, the pole body has a communication hole that penetrates a groove wall of the accommodating groove on a side closer to the accommodating cavity, and connects the accommodating cavity and the accommodating groove.

17. 17. The battery cell according to claim 16, wherein the battery cell includes a cell assembly, the cell assembly including an active material applied portion accommodated in the accommodating cavity and a conductive portion connected to the active material applied portion, the conductive portion being inserted into the communicating hole so as to be at least partially accommodated in the accommodating groove.

18. The battery cell according to any one of claims 16 to 17, wherein the pole includes a pole cover plate that covers the pole body, the pole cover plate has a liquid filling hole that can communicate with the accommodating groove, and the battery cell further includes a sealing structure that seals the liquid filling hole.

19. A battery comprising the battery cell according to any one of claims 1 to 18.

20. 20. An electrical device comprising the battery of claim 19.

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