Battery cells, batteries and electrical devices

Abstract

The present invention relates to a battery cell, a battery, and an electric 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 pole including a through-hole and a first extending portion, the first extending portion extending outward from the outer surface or inward from the inner surface of the first case wall, a connection portion between the first extending portion and the through-hole having a first corner facing the first case wall, the first case wall including a second corner corresponding to the first corner, the insulating sealing structure fitted between the first case wall and the pole, and including a first portion and a second portion, the first portion having a lower material hardness than the second portion, and the first portion being closer to at least one of the first corner and the second corner than the second 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 202311203328.9 and filing date September 18, 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 [Problem to be solved by 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. [Means for solving the problem]

[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, the first case wall having a mounting hole, the pole including an insertion portion inserted into the mounting hole and a first extension 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 extension portion extending outward from the outer surface or inward from the inner surface of the first case wall, the connection portion between the first extension portion and the insertion portion having a first corner facing the first case wall, the first case wall including a second corner corresponding to the first corner, the insulating sealing structure fitted between the first case wall and the pole, including a first portion and a second portion, the material hardness of the first portion being lower than the material hardness of the second portion, and the first portion being located closer to at least one of the first corner and the second corner than the second portion.

[0005] In the above technical solution, when the pole is attached to the first case wall, the pole applies an acting force to the insulating sealing structure fitted between the pole and the first case wall, causing the insulating sealing structure to press against the first case wall, which in turn applies a reaction force to the insulating sealing structure, resulting in a relatively concentrated force at the first corner and / or second corner of the insulating sealing structure, making the weak points prone to tearing. By providing the insulating sealing structure with a first portion and a second portion, where the material hardness of the first portion is lower than that of the second portion and the first portion is located closer to at least one of the first corner and the second corner than the second portion, the first portion, which has a relatively lower material hardness, is used at the weak points of the insulating sealing structure, and the first portion is more easily compressed and deformed by the force and absorbs the acting force than the second portion, reducing the risk of tearing at the weak points of the insulating sealing structure and further improving the reliability of the insulating sealing fit between the first case wall and the pole, thereby improving the reliability of the battery cell. In addition, by providing a second portion whose material hardness is higher than that of the first portion, the support effect of the second portion can be utilized to effectively control the compression amount of the insulating sealing structure, thereby achieving an effective sealing effect and improving the fitting and sealing performance between the terminal post and the first case wall.

[0006] In some embodiments, the insulating sealing structure includes a third corner located corresponding to the first corner, and the first portion includes a first sub-portion located closer to the third corner than the second portion.

[0007] In the above technical solution, the insulating sealing structure includes a third corner corresponding to the first corner, so when the terminal post is attached and fixed to the first case wall, the terminal post presses the insulating sealing structure, and the third corner of the insulating sealing structure is subjected to a relatively large force and is prone to tearing.By providing the first sub-part, whose material hardness is lower than that of the second part, the first sub-part is easily compressed and deformed by the force received, absorbing the force received, thereby reducing the risk of the insulating sealing structure tearing at the third corner.

[0008] In some embodiments, the first sub-portion defines a partial outer surface of the third corner.

[0009] In the above technical solution, the first sub-part is exposed to the outer surface of the insulating sealing structure near the first corner, which is advantageous in that it can be more efficiently compressed and deformed by the applied force, buffering the applied force and preventing cracking at that location. In addition, this configuration also reduces the difficulty of assembling the first sub-part and the second part together.

[0010] In some embodiments, the surface of the insulating sealing structure facing the first extension portion includes a first surface portion defined by a first sub-portion, and the surface of the insulating sealing structure facing the first extension portion further includes a second surface portion defined by a second portion, and the first surface portion exceeds or is flush with the second surface portion.

[0011] In the above technical solution, the surface of the insulating sealing structure facing the first extension portion includes a first surface portion defined by the first sub-portion, which more effectively buffers the pressing force from the first extension portion and effectively alleviates the problem of tearing at the third corner due to the pressing force from the first extension portion. Furthermore, the surface of the insulating sealing structure facing the first extension portion includes a second surface portion defined by the second portion, which utilizes the axial support effect of this portion to more effectively control the compression amount of the insulating sealing structure, achieving an effective sealing effect and improving the mating sealing between the terminal post and the first case wall. Furthermore, because the first surface portion is not recessed lower than the second surface portion, when the terminal post presses against the third corner of the insulating sealing structure, the first surface portion provides a timely buffering effect without being affected by the second surface portion, protecting the third corner of the insulating sealing structure and alleviating the problem of tearing at that corner. Furthermore, since the first surface exceeds or is flush with the second surface, flexibility in processing and design of the insulating sealing structure can be improved.

[0012] In some embodiments, the surface of the insulating sealing structure facing the insertion portion includes a third surface portion defined by the first sub-portion, and the surface of the insulating sealing structure facing the insertion portion further includes a fourth surface portion defined by the second portion, and the third surface portion exceeds or is flush with the fourth surface portion.

[0013] In the above technical solution, the first sub-portion defines a third surface portion of the surface of the insulating sealing structure facing the insertion portion, thereby effectively buffering the pressing force from the insertion portion and effectively alleviating the problem of tearing at the third corner due to the pressing force from the insertion portion. Furthermore, because the third surface portion is not recessed lower than the fourth surface portion, when the terminal post presses against the third corner of the insulating sealing structure, the third surface portion is not affected by the fourth surface portion and provides a timely buffering effect, protecting the third corner of the insulating sealing structure and alleviating the problem of tearing at that location. Furthermore, because the third surface portion exceeds or is flush with the fourth surface portion, flexibility in processing and design of the insulating sealing structure is improved.

[0014] In some embodiments, the insulating sealing structure includes a fourth corner located corresponding to the second corner, and the first portion includes a second sub-portion located closer to the fourth corner than the second portion.

[0015] In the above technical solution, since the insulating sealing structure includes a fourth corner provided corresponding to the second corner, when the terminal post is attached and fixed to the first case wall, the terminal post presses the insulating sealing structure, which presses the first case wall, and the first case wall applies a reaction force to the insulating sealing structure, so that the fourth corner of the insulating sealing structure receives a relatively large reaction force from the second corner of the first case wall and is prone to tearing.By providing a second sub-part whose material hardness is lower than that of the second part, the second sub-part is easily compressed and deformed by the force received and absorbs the force received, thereby reducing the risk of tearing from the fourth corner of the insulating sealing structure.

[0016] In some embodiments, the second sub-portion defines a partial outer surface of the fourth corner.

[0017] In the above technical solution, the second sub-part is exposed to the outer surface of the insulating sealing structure near the second corner, which allows it to be more efficiently compressed and deformed by the applied force, which is advantageous in buffering the applied force and preventing cracking at that location. In addition, this configuration also reduces the difficulty of assembling the first sub-part and the second part together.

[0018] In some embodiments, the insertion portion and the insulating sealing structure have a mating gap.

[0019] In the above technical solution, the insertion portion is less likely to directly press the insulating sealing structure, which further reduces the force transmitted to the insulating sealing structure, thereby reducing damage to the insulating sealing structure and achieving the effect of protecting the insulating sealing structure.

[0020] In some embodiments, the second portion and the first portion are both ring-shaped structures that extend completely around the circumference of the mounting hole.

[0021] The above technical solution is easy to process and install, and can effectively improve the cracking problem.

[0022] In some embodiments, the insulating sealing structure includes a third corner corresponding to the first corner, and at least one of the first corner and the third corner is chamfered, and / or the first corner and the third corner have a fitting gap.

[0023] In the above technical solution, the pressing force of the first corner against the third corner can be reduced to a certain extent, thereby reducing the risk of the insulating sealing structure tearing at the third corner.

[0024] In some embodiments, the insulating sealing structure includes a fourth corner corresponding to the second corner, and at least one of the second corner and the fourth corner is chamfered, and / or the second corner and the fourth corner have a fitting gap.

[0025] In the above technical solution, the pressing force of the second corner against the fourth corner can be reduced to a certain extent, thereby reducing the risk of the insulating sealing structure tearing at the fourth corner.

[0026] In some embodiments, the battery cell includes a first spacer disposed between the first extension and the insulating sealing structure.

[0027] In the above technical solution, when the pole is attached to the first case wall, the first extension portion presses the insulating sealing structure toward the first case wall. Therefore, the first spacer is provided between the insulating sealing structure and the first extension portion. This allows the first spacer to dissipate part of the acting force, thereby reducing the acting force transmitted to the insulating sealing structure, and further reducing damage to the insulating sealing structure, thereby achieving the effect of protecting the insulating sealing structure.

[0028] In some embodiments, the battery cell includes a second spacer, the second spacer having a material hardness lower than the material hardness of the second portion, disposed between the insulating sealing structure and a surface of the first case wall facing the first extension portion.

[0029] In the above technical solution, when the pole is attached to the first case wall, the pole presses the insulating sealing structure toward the first case wall, and the insulating sealing structure can transmit the acting force to the second spacer. Because the second spacer has a relatively low material hardness, it can compress and deform to absorb the acting force, thereby reducing the reaction force fed back to the insulating sealing structure, reducing damage to the insulating sealing structure, and achieving the effect of protecting the insulating sealing structure.

[0030] In some embodiments, the first extension portion is formed on the pole by burring and caulking.

[0031] In the above technical solution, the terminal post is easy to process, which helps to improve the connection reliability between the first extending portion and the insertion portion, and the attachment reliability between the terminal post and the first case wall.

[0032] In some embodiments, the insertion portion and the first extension portion form a first pole portion, and the insulating sealing structure includes a first insulating sealing member fitted between the first pole portion and the first case wall, and the first insulating sealing member is composed of a first portion and a second portion.

[0033] In the above technical solution, the structure of the first insulating sealing member can be simplified, which facilitates the processing of the first insulating sealing member.

[0034] In some embodiments, the pole further includes a second extension 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 extension portion and the first extension portion extending on both the inner and outer sides of the first case wall, respectively, the insertion portion and the second extension portion constituting a second pole portion, and the insulating sealing structure includes a second insulating sealing member fitted between the second pole portion and the first case wall and provided separately from the first insulating sealing member.

[0035] In the above technical solution, the pole includes a first extension portion and a second extension portion provided on both the inner and outer sides of the first case wall, respectively, so that the pole and the first case wall fit together more stably and reliably. Furthermore, the insulating sealing structure includes a first insulating sealing member and a second insulating sealing member that are provided separately, so that the first insulating sealing member and the second insulating sealing member can be attached separately, making installation less difficult and ensuring the insulating sealing fit effect at each point between the pole and the first case wall.

[0036] In some embodiments, the pole includes a pole body and a pole cover plate, the pole body includes a first pole portion and a second pole portion, the first extension portion extends outward from the outer surface of the first case wall, the pole cover plate covers the side of the first pole portion away from the second pole portion, the pole body is welded to the pole cover plate, and the material hardness of the second insulating sealing member is lower than the material hardness of the second portion.

[0037] In the above technical solution, the material hardness of the second part is higher than that of the second insulating sealing member, and the second insulating sealing member is more susceptible to compressive deformation than the second part, resulting in a better sealing effect. However, the heat resistance of the second part is stronger than that of the second insulating sealing member, so that when the pole body and the pole cover plate are welded together, the thermal impact on the second insulating sealing member can be minimized, improving the sealing reliability between the first case wall and the pole.

[0038] 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.

[0039]

[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 penetration-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 reduce the processing accuracy requirements for the electrode post cover plate and the electrode post body.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] In a third aspect, embodiments of the present application further provide an electrical device comprising a battery according to any of the above solutions.

[0049] 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]

[0050] 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 the 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] 1 is a cross-sectional view of an insulating sealing structure provided in some embodiments of the present application. [Figure 10] 1 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application. [Figure 11] 1 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application. [Figure 12] 1 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application. [Figure 13] 1 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application. [Figure 14] 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

[0051] 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.

[0052] 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.

[0053] 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.

[0054] In the description of this application, it should be noted that unless otherwise clearly defined or limited, the terms "attach," "couple," "connect," "attach," 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 meaning of the above terms in this application according to specific circumstances.

[0055] 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.

[0056] 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.

[0057] The term "plurality" as used in this application means two or more (including two).

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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. For example, in a lithium-ion battery, 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.

[0062] 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.

[0063] 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.

[0064] The material of the separator is not limited, and may be, for example, polypropylene or polyethylene.

[0065] In some battery cells in the related art, the poles are attached to the case by riveting. To ensure an insulating seal between the case and the pole, insulating plastic is usually placed between the pole and the case before the pole is riveted. However, when the pole is riveted, the pole is deformed by the force it receives, pressing against the insulating plastic, and the weak parts of the insulating plastic are prone to tearing due to the force it receives. Once the insulating plastic tears, the reliability of the insulating seal between the case and the pole is affected, reducing the reliability of the battery cell.

[0066] 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, the pole including an insertion portion inserted into the mounting hole, and a first extension 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 first extension portion extending outward from the outer surface or inward from the inner surface of the first case wall, the connection portion between the first extension portion and the insertion portion has a first corner facing the first case wall, and the first case wall includes a second corner provided corresponding to the first corner, the insulating sealing structure is fitted between the first case wall and the pole, and includes a first portion and a second portion, the material hardness of the first portion is lower than the material hardness of the second portion, and the first portion is located closer to at least one of the first corner and the second corner than the second portion.

[0067] As a result, when the pole is attached to the first case wall, the pole applies an acting force to the insulating sealing structure, and the first case wall applies a reactive force to the insulating sealing structure, and the portions of the insulating sealing structure corresponding to the first corner and / or second corner are subjected to a relatively large force, becoming weak spots that are prone to tearing. By providing the insulating sealing structure with a first portion and a second portion, where the material hardness of the first portion is lower than that of the second portion and the first portion is located closer to at least one of the first corner and the second corner than the second portion, the insulating sealing structure uses the first portion, which has a relatively low material hardness, at the weak spots, and the first portion is more easily compressively deformed by the force received and absorbs the acting force than the second portion, thereby reducing the risk of tearing at the weak spots of the insulating sealing structure and helping to improve the reliability of the insulating sealing fit between the first case wall and the pole, thereby improving the reliability of the battery cell.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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 realizing electrical connection between the multiple battery cells 102.

[0074] 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.

[0075] 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, which 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, thereby electrically connecting the conductive portion 72 between the active material coated portion 71 and the pole 2.

[0076] 5 and 6, the case 1 includes a first case wall 13, which has a mounting hole 12, and the pole 2 is inserted into the mounting hole 12 so as to be attached to the first case wall 13. Here, the pole 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, i.e., at least a portion of the insertion portion 33 is within the mounting hole 12, and with the axial direction of the mounting hole 12 being the projection direction and a plane perpendicular to the axial direction of the mounting hole 12 being the projection plane, 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, thereby enabling the insertion of the insertion portion 33 into the mounting hole 12.

[0077] 5 and 6, the first extending 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 extending portion 32 extends toward the outside of the outer surface or the inside of the inner surface of the first case wall 13. Here, the surfaces on both sides 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 toward the inside of the inner surface of the first case wall 13" means that at least a portion of the first extension portion 32 faces directly toward 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 portion of the first extension portion 32 corresponding to the overlapping area faces directly toward the first case wall 13.

[0078] 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, thereby indirectly fitting the pole 2 and the first case wall 13 through the insulating sealing structure 8, further realizing insulation and sealing between the first case wall 13 and the pole 2.

[0079] 6 and 7 , the connection portion between the first extension portion 32 and the insertion portion 33 has a first corner 34 facing the first case wall 13, i.e., the side of the connection portion between the first extension portion 32 and the insertion portion 33 closer to the first case wall 13 is formed as the first corner 34, and the first case wall 13 includes a second corner 131 provided corresponding to the first corner 34, i.e., the corner of the first case wall 13 closer to the first corner 34 is the second corner 131. The insulating sealing structure 8 includes a first portion 83 and a second portion 84, the material hardness of the first portion 83 is lower than the material hardness of the second portion 84, and the first portion 83 is provided closer to at least one of the first corner 34 and the second corner 131 than the second portion 84. In other words, the first portion 83 may be positioned as a whole closer to the first corner 34 than the second portion 84, or the first portion 83 may be positioned as a whole closer to the second corner 131 than the second portion 84, or part of the first portion 83 may be positioned closer to the first corner 34 than the second portion 84, and part of the first portion 83 may be positioned closer to the second corner 131 than the second portion 84.

[0080] In the embodiment of the present application, when the pole 2 is attached to the first case wall 13, the pole 2 applies a force to the insulating sealing structure 8 fitted between the pole 2 and the first case wall 13, and the portions of the insulating sealing structure 8 corresponding to the first corner 34 and / or the second corner 131 are subjected to a relatively large force, becoming weak and prone to tearing. The insulating sealing structure 8 includes a first portion 83 and a second portion 84, the first portion 83 having a lower material hardness than the second portion 84, and the first portion 83 being located closer to at least one of the first corner 34 and the second corner 131 than the second portion 84. This allows the first portion 83, which has a relatively low material hardness, to be used in weak portions of the insulating sealing structure 8. The first portion 83 is more easily compressed and deformed by a force than the second portion 84, absorbing the force. This reduces the risk of tearing at weak portions of the insulating sealing structure 8, which helps improve the reliability of the insulating seal fit between the first case wall 13 and the electrode post 2 and the reliability of the battery cell 102. Furthermore, by providing the second portion 84 with a higher material hardness than the first portion 83, the support provided by the second portion 84 can be used to effectively control the amount of compression of the insulating sealing structure 8, achieving an effective sealing effect and further improving the fit and seal between the electrode post 2 and the first case wall 13.

[0081] It should be noted that the materials of the first portion 83 and the second portion 84 are not limited and may be specifically selected according to actual requirements. For example, the material of the first portion 83 may be a compressible rubber or plastic material, such as PFA (i.e., perfluoroalkoxy), PP (i.e., polypropylene), FKM (i.e., fluororubber), or EPDM (i.e., ethylene propylene diene terpolymer rubber), which provides the first portion 83 with high compressive deformation and effectively reduces cracking. For example, the material of the second portion 84 may be a high-hardness insulating material, such as PPS (i.e., polyphenylene sulfide, a novel high-performance thermoplastic resin) or LCP (i.e., liquid crystal polymer), which provides the second portion 84 with high hardness, provides support, effectively controls the compression amount of the insulating sealing structure 8, and improves sealing performance.

[0082] It should be noted that the specific configuration of the insulating sealing structure 8 is not limited and may be a single member or may be composed of multiple members. For example, referring to Fig. 7, the insulating sealing structure 8 may include a first insulating sealing member 85 and a second insulating sealing member 86, where a first portion 83 and a second portion 84 can constitute the first insulating sealing member 85, and the second insulating sealing member 86 and the first insulating sealing member 85 are respectively disposed approximately on both the inner and outer sides of the first case wall 13. The material hardness of the second insulating sealing member 86 is lower than that of the second portion 84, thereby providing high sealing performance with easy compression deformation. For example, the second insulating sealing member 86 may be a rubber member, and when the second portion 84 has a strong supporting effect, the compression amount of the second insulating sealing member 86 in the insulating sealing structure 8 can be effectively controlled, improving the sealing effect.

[0083] In some embodiments of the present application, as shown in FIG. 7 , the insulating and sealing structure 8 includes a third corner 81 located corresponding to the first corner 34, and the first portion 83 includes a first sub-portion 831 located closer to the third corner 81 than the second portion 84, with the first sub-portion 831 having a material hardness lower than that of the second portion 84. Because the insulating and sealing structure 8 includes the third corner 81 located corresponding to the first corner 34, when the terminal post 2 is attached and fixed to the first case wall 13, the terminal post 2 presses against the insulating and sealing structure 8, and the third corner 81 of the insulating and sealing structure 8 receives a relatively large force and is prone to tearing. By providing the first sub-portion 831 with a material hardness lower than that of the second portion 84, the first sub-portion 831 is easily compressively deformed by the force applied and absorbs the force, thereby reducing the risk of tearing at the third corner 81 of the insulating and sealing structure 8.

[0084] 8 , the insulating sealing structure 8 includes a fourth corner 82 provided corresponding to the second corner 131, and the first portion 83 includes a second sub-portion 832 provided closer to the fourth corner 82 than the second portion 84, and the material hardness of the second sub-portion 832 is lower than that of the second portion 84. Because the insulating sealing structure 8 includes the fourth corner 82 provided corresponding to the second corner 131, when the terminal post 2 is attached and fixed to the first case wall 13, the terminal post 2 presses the insulating sealing structure 8, and the insulating sealing structure 8 presses the first case wall 13, and the first case wall 13 applies a reaction force to the insulating sealing structure 8, and the fourth corner 82 of the insulating sealing structure 8 receives a relatively large reaction force from the second corner 131 of the first case wall 13 and is therefore prone to tearing. By providing the second sub-portion 832 whose material hardness is lower than that of the second portion 84, the second sub-portion 832 is easily compressed and deformed by the force received, and absorbs the force received, thereby reducing the risk of tearing at the fourth corner 82 of the insulating sealing structure 8.

[0085] It should be noted that the first part 83 may include the first sub-part 831 and the second sub-part 832 at the same time, which can more completely reduce the risk of tearing at the weak points of the insulating sealing structure 8 and improve the structural reliability of the insulating sealing structure 8. It should also be noted that the materials of the first sub-part 831 and the second sub-part 832 may be the same or different, and can be specifically set according to actual circumstances.

[0086] 7 and 8, the first extension portion 32 is formed on the terminal post 2 by burring and crimping. That is, after the terminal post 2 is fitted into the mounting hole 12 by the insertion portion 33, the first extension portion 32 is produced by the burring and crimping process. This makes it easier to process the terminal post 2 and helps to 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.

[0087] As shown in Figure 7, when the first extension portion 32 is processed on the pole 2 by the riveting process, the pole 2 presses against the insulating sealing structure 8, so that the third corner 81 of the insulating sealing structure 8 is subjected to a relatively large force, and there is a risk of tearing at this location.If the first portion 83 has a first sub-portion 831 that is located closer to the third corner 81 than the second portion 84, the risk of tearing at the third corner 81 of the insulating sealing structure 8, i.e., the location corresponding to the first corner 34, can be reduced.

[0088] As shown in Figure 8, when the first extension portion 32 is processed on the pole 2 by the riveting process, the pole 2 presses against the insulating sealing structure 8, which presses against the first case wall 13, and the first case wall 13 applies a reaction force to the insulating sealing structure 8. As a result, the fourth corner 82 of the insulating sealing structure 8 is subjected to a relatively large force, and there is a risk of tearing at this location. However, if the first portion 83 has a second sub-portion 832 that is located closer to the fourth corner 82 than the second portion 84, the risk of tearing at the fourth corner 82 of the insulating sealing structure 8, i.e., the location corresponding to the second corner 131, can be reduced.

[0089] 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, or, for example, the two parts may be attached to the mounting holes 12, respectively, 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, and it is understood that by using the first part 83 and the second part 84 of different materials in the insulating sealing structure 8 and locating the first part 83 closer to a location that is relatively weaker and more likely to tear than the second part 84, the tearing problem of the insulating sealing structure 8 can be improved and the reliability of the insulating sealing structure 8 can be improved.

[0090] 7 , when the first portion 83 includes a first sub-portion 831 located closer to the third corner 81 than the second portion 84, the first sub-portion 831 can define a portion of the outer surface of the third corner 81. For example, the first sub-portion 831 can partially define the surface facing the first extension portion 32 of the insulating sealing structure 8 and / or the surface facing the insertion portion 33 of the insulating sealing structure 8. This allows the first sub-portion 831 to be exposed to the outer surface of the insulating sealing structure 8 at a position closer to the first corner 34, allowing it to be more efficiently compressed and deformed by the applied force, which is advantageous for buffering the applied force and preventing tearing at that location. Furthermore, this configuration also reduces the difficulty of assembling the first sub-portion 831 and the second portion 84 together.

[0091] For example, as shown in Figure 7, the surface of the insulating sealing structure 8 facing the first extension portion 32 includes a first surface portion 8311 defined by the first sub-portion 831, and the surface of the insulating sealing structure 8 facing the first extension portion 32 further includes a second surface portion 841 defined by the second portion 84, where the first surface portion 8311 is flush with the second surface portion 841, i.e., the first surface portion 8311 is adjacent to the second surface portion 841 and the two are on the same plane, or, referring to Figure 9, the first surface portion 8311 exceeds the second surface portion 841, i.e., the first surface portion 8311 is adjacent to the second surface portion 841 and a portion of the first surface portion 8311 protrudes from the side of the second surface portion 841 closer to the first extension portion 32.

[0092] As a result, the surface of insulating sealing structure 8 facing first extension portion 32 includes first surface portion 8311 defined by first sub-portion 831, which effectively buffers the pressing force from first extension portion 32 and effectively alleviates the problem of tearing of third corner 81 due to pressing force from the first extension portion 32 side. In addition, the surface of insulating sealing structure 8 facing first extension portion 32 includes second surface portion 841 defined by second portion 84, which utilizes the supporting action of this portion in the axial direction of mounting hole 12 to effectively control the amount of compression of insulating sealing structure 8, obtain an effective sealing effect, and improve the fitting and sealing performance between terminal post 2 and first case wall 13. Furthermore, because the first surface portion 8311 is not recessed lower than the second surface portion 841, when the pole 2 presses against the third corner 81 of the insulating sealing structure 8, the first surface portion 8311 is not affected by the second surface portion 841 and provides a buffering effect in a timely manner, protecting the third corner 81 of the insulating sealing structure 8 and improving the problem of tearing at this location. Furthermore, because the first surface portion 8311 exceeds or is flush with the second surface portion 841, the flexibility of processing and design of the insulating sealing structure 8 can be improved.

[0093] In some embodiments of the present application, as shown in FIG. 7, the width W of the second surface portion 841 in the thickness direction of the insertion portion 33 may be 0.5 mm or more, which provides a sufficient width dimension for the second surface portion 841, efficiently utilizes the axial support action of the mounting hole 12, makes it possible to effectively control the compression amount of the insulating sealing structure 8, and obtains an effective sealing effect.

[0094] After the insulating sealing structure 8 is attached, the first sub-portion 831 is compressed and deformed. For example, the axial thickness Y1 of the first sub-portion 831 decreases, and the radial width X1 may increase or decrease. Regardless of whether the first surface portion 8311 protrudes from the second surface portion 841 or whether the third surface portion 8312 protrudes from the fourth surface portion 842, before the insulating sealing structure 8 is attached, referring to FIG. 9 , the radial width of the first sub-portion 831 is X1 and the axial thickness is Y1. After the insulating sealing structure 8 is attached, the insulating sealing structure 8 is compressed by the terminal post 2 and the first case wall 13, and the radial width of the first sub-portion 831 becomes X2 and the axial thickness becomes Y2.

[0095] For example, 0.01*X1≦X2≦200%*X1, and 10%*Y1≦Y2≦100%*Y1, so that the deformation range of the first sub-part 831 is increased, which can effectively buffer the pressing force and protect the insulating sealing structure 8.

[0096] For example, Y1 is 0.5 mm or more, which provides a sufficient axial thickness of the first sub-portion 831, effectively buffering the pressing force from the first extension portion 32 and effectively improving the problem of cracking of the third corner 81 due to the pressing force from the first extension portion 32 side.

[0097] It should be noted that when the insulating sealing structure 8 is configured such that the first surface portion 8311 exceeds the second surface portion 841, this may refer to the state before the insulating sealing structure 8 is installed, and after the insulating sealing structure 8 is installed, the relationship between the first surface portion 8311 and the second surface portion 841 may change; for example, the first surface portion 8311 may be pressed so as to be flush with the second surface portion 841, or the first surface portion 8311 may still exceed the second surface portion 841.

[0098] 9 , in some embodiments, when the first surface portion 8311 exceeds the second surface portion 841, the dimension E of the first surface portion 8311 exceeding the second surface portion 841 may be 0 mm to 1 mm. This prevents the dimension E of the first surface portion 8311 exceeding the second surface portion 841 from becoming too small, making it possible for the first surface portion 8311 to be effectively compressed and improving the problem of tearing at the third corner 81. On the other hand, because the dimension E of the first surface portion 8311 exceeding the second surface portion 841 does not become too large, after the first surface portion 8311 is compressed, the second surface portion 841 can provide effective axial support, making it possible to effectively control the compression amount of the insulating sealing structure 8 and achieving an effective sealing effect.

[0099] 9 , in some embodiments, when the third surface portion 8312 exceeds the fourth surface portion 842, the dimension F of the third surface portion 8312 exceeding the fourth surface portion 842 may be 0 mm to 3 mm. This prevents the dimension F of the third surface portion 8312 exceeding the fourth surface portion 842 from becoming too small, allowing the third surface portion 8312 to be effectively compressed and improving the tearing problem at the third corner 81. On the other hand, after the first surface portion 8311 is compressed, the third surface portion 8312 exceeds the fourth surface portion 842 by a greater amount, and by setting the dimension F of the third surface portion 8312 exceeding the fourth surface portion 842 without becoming too large, it is possible to avoid the tearing problem caused by the third surface portion 8312 applying excessive pressure to the insertion portion 33.

[0100] Of course, the present application is not limited thereto, and for example, in some other embodiments of the present application, the surface of the insulating sealing structure 8 facing the first extension portion 32 may be entirely defined by the second portion 84, or entirely defined by the first sub-portion 831.

[0101] For example, as shown in FIG. 7, the surface of the insulating sealing structure 8 facing the insertion portion 33 includes a third surface portion 8312 defined by the first sub-portion 831, and the surface of the insulating sealing structure 8 facing the insertion portion 33 further includes a fourth surface portion 842 defined by the fourth portion, wherein the third surface portion 8312 is flush with the fourth surface portion 842, i.e., the third surface portion 8312 is adjacent to the fourth surface portion 842 and the two are on the same plane; or, referring to FIG. 9, the third surface portion 8312 exceeds the fourth surface portion 842, i.e., the third surface portion 8312 is adjacent to the fourth surface portion 842 and a portion of the third surface portion 8312 protrudes from the side of the fourth surface portion 842 closer to the insertion portion 33.

[0102] It should be noted that the insulating sealing structure 8 may be configured such that the third surface portion 8312 exceeds the fourth surface portion 842 before mounting, and the relationship between the third surface portion 8312 and the fourth surface portion 842 may change after mounting; for example, the third surface portion 8312 may be pressed to be flush with the fourth surface portion 842, or the third surface portion 8312 may still exceed the fourth surface portion 842.

[0103] As a result, the first sub-portion 831 defines a third surface portion 8312 on the surface of the insulating sealing structure 8 facing the insertion portion 33, thereby effectively cushioning the pressing force from the insertion portion 33 and effectively alleviating the problem of tearing at the third corner 81 due to the pressing force from the insertion portion 33. Furthermore, because the third surface portion 8312 is not recessed lower than the fourth surface portion 842, when the terminal post 2 presses against the third corner 81 of the insulating sealing structure 8, the third surface portion 8312 provides a timely cushioning effect without being affected by the fourth surface portion 842, protecting the third corner 81 of the insulating sealing structure 8 and alleviating the problem of tearing at this location. Furthermore, because the third surface portion 8312 exceeds or is flush with the fourth surface portion 842, flexibility in processing and design of the insulating sealing structure 8 is improved.

[0104] Of course, the present application is not limited thereto, and for example, in some other embodiments of the present application, the surface of the insulating sealing structure 8 facing the insertion portion 33 may be entirely defined by the second portion 84, or entirely defined by the first sub-portion 831.

[0105] In some embodiments, the first sub-portion 831 simultaneously defines a first surface portion 8311 on the surface facing the first extension portion 32 of the insulating sealing structure 8 and a third surface portion 8312 on the surface facing the insertion portion 33 of the insulating sealing structure 8, and the first surface portion 8311 and the second surface portion 841 are connected to each other. For example, the second portion 84 may be formed to have a first notch at a position corresponding to the first corner 34, and the first notch may be filled by the first sub-portion 831, which makes it easier to process the insulating sealing structure 8 and helps the first sub-portion 831 to provide protection for the third corner 81, thereby improving the cracking problem of the third corner 81.

[0106] 8 , when the first portion 83 includes a second sub-portion 832 disposed closer to the fourth corner 82 than the second portion 84, the second sub-portion 832 can define a partial outer surface of the fourth corner 82. This allows the second sub-portion 832 to be exposed to the outer surface of the insulating sealing structure 8 at a position closer to the second corner 131, allowing it to be more efficiently compressed and deformed by the applied force, which is advantageous for buffering the applied force and preventing cracking at that location. Furthermore, this arrangement also reduces the difficulty of assembling the first sub-portion 831 and the second portion 84 together.

[0107] In some embodiments, since there is a fitting gap between the insertion portion 33 and the insulating sealing structure 8, the insertion portion 33 is less likely to press directly against the insulating sealing structure 8, which further reduces the force transmitted to the insulating sealing structure 8, reduces damage to the insulating sealing structure 8, and provides the effect of protecting the insulating sealing structure 8.

[0108] It should be noted that when the insulating sealing structure 8 is formed as a ring-shaped structure surrounding the central axis L of the mounting hole 12, the first sub-part 831 may be a ring-shaped structure extending around the entire circumference of the insulating sealing structure 8, which is convenient for processing and has a complete tear-proof effect, or may be an intermittent structure spaced apart around the circumference of the insulating sealing structure 8, which is helpful in saving materials and reducing costs.

[0109] Similarly, when the insulating sealing structure 8 is formed as a ring-shaped structure that surrounds the central axis L of the mounting hole 12, the second sub-portion 832 may be a ring-shaped structure that extends around the entire circumference of the insulating sealing structure 8, which facilitates processing and ensures complete tear prevention, or it may be an intermittent structure that is spaced apart around the circumference of the insulating sealing structure 8, which helps save material and reduce costs.

[0110] 10 , the battery cell 102 includes a first spacer 91 provided between the first extension 32 and the insulating sealing structure 8. As a result, when the electrode post 2 is attached to the first case wall 13, the first extension 32 presses the insulating sealing structure 8 toward the first case wall 13 (for example, pressing the insulating sealing structure 8 in the axial direction of the mounting hole 12). Because the first spacer 91 is provided between the insulating sealing structure 8 and the first extension 32, the first spacer 91 dissipates part of the acting force, thereby reducing the acting force transmitted to the insulating sealing structure 8, and further reducing damage to the insulating sealing structure 8 and protecting the insulating sealing structure 8.

[0111] It should be noted that the relationship between the material hardness of the first spacer 91 and the material hardness of the insulating sealing structure 8 is not limited. For example, the material hardness of the first spacer 91 may be higher than the material hardness of the second portion 84, thereby allowing the first spacer 91 to effectively attenuate the pressing force transmitted to the insulating sealing structure 8 and more effectively alleviate the problem of cracking of the insulating sealing structure 8. For example, the second portion 84 may be a plastic member and the first spacer 91 may be a metal member, thereby realizing that the material hardness of the first spacer 91 is higher than the material hardness of the second portion 84. For example, the first spacer 91 may be made of a steel material such as SUS304, SUS316, or SPCC, or an aluminum material such as Al1060.

[0112] For example, when the first spacer 91 is provided, only the second sub-portion 832 may be provided, without the first sub-portion 831, which not only effectively improves the cracking problem at the third corner 81 and the fourth corner 82 of the insulating sealing structure 8, but also simplifies the structure of the insulating sealing structure 8. However, the present application is not limited thereto, and when the first spacer 91 is provided, the first sub-portion 831 and the second sub-portion 832 may be provided at the same time, which more satisfactorily improves the cracking problem at the third corner 81 and the fourth corner 82 of the insulating sealing structure 8.

[0113] 11 , the battery cell 102 includes a second spacer 92 provided between the insulating sealing structure 8 and the surface of the first case wall 13 facing the first extension portion 32, and the material hardness of the second spacer 92 is lower than the material hardness of the second portion 84. For example, when the first extension portion 32 extends outward from the outer surface of the first case wall 13, the second spacer 92 is provided between the first extension portion 32 and the outer 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 spacer 92 is provided between the first extension portion 32 and the inner surface of the first case wall 13.

[0114] As a result, when the pole 2 is attached to the first case wall 13, if the pole 2 presses the insulating sealing structure 8 toward the first case wall 13 (for example, pressing the insulating sealing structure 8 in the axial direction of the mounting hole 12), the insulating sealing structure 8 can transmit the acting force to the second spacer 92, and because the material hardness of the second spacer 92 is relatively low, it can compressively deform and absorb the acting force, thereby reducing the reaction force fed back to the insulating sealing structure 8, reducing damage to the insulating sealing structure 8, and providing the effect of protecting the insulating sealing structure 8.

[0115] For example, when the second spacer 92 is provided, only the first sub-portion 831 may be provided without the second sub-portion 832, which not only effectively improves the cracking problem at the third corner 81 and the fourth corner 82 of the insulating sealing structure 8 but also simplifies the structure of the insulating sealing structure 8. However, the present application is not limited thereto, and when the second spacer 92 is provided, the first sub-portion 831 and the second sub-portion 832 may be provided at the same time, which more satisfactorily improves the cracking problem at the third corner 81 and the fourth corner 82 of the insulating sealing structure 8.

[0116] 11 , the insulating sealing structure 8 includes a fourth corner 82 corresponding to the second corner 131, and at least one of the second corner 131 and the fourth corner 82 is chamfered (e.g., R-chamfered or C-chamfered). That is, only the second corner 131 may be chamfered, and the fourth corner 82 may be unchamfered, e.g., a right angle, acute angle, or obtuse angle. Alternatively, only the fourth corner 82 may be chamfered, and the second corner 131 may be unchamfered, e.g., a right angle, acute angle, or obtuse angle. Alternatively, both the second corner 131 and the fourth corner 82 are chamfered.

[0117] When the terminal post 2 is attached and fixed to the first case wall 13, the second corner 131 presses against the fourth corner 82, causing the insulating sealing structure 8 to tear at the location of the fourth corner 82. Chamfering the second corner 131 increases the area over which the second corner 131 applies force to the fourth corner 82, dispersing the force application position and reducing the concentration of the applied force on the fourth corner 82, thereby reducing the risk of the insulating sealing structure 8 tearing at the location of the fourth corner 82. Chamfering the fourth corner 82 increases the force-receiving area of ​​the fourth corner 82 when the second corner 131 applies force to the fourth corner 82, dispersing the force received by the fourth corner 82, thereby reducing the risk of the insulating sealing structure 8 tearing at the location of the fourth corner 82. Thus, by chamfering at least one of the second corner 131 and the fourth corner 82, the risk of the insulating sealing structure 8 tearing at the fourth corner 82 can be reduced.

[0118] In some embodiments of the present application, regardless of whether at least one of the second corner 131 and the fourth corner 82 is chamfered or not, the second corner 131 and the fourth corner 82 can be arranged to have a fitting gap, thereby reducing the pressure of the second corner 131 against the fourth corner 82 to a certain extent and reducing the risk of tearing at the fourth corner 82 of the insulating sealing structure 8.

[0119] 11 , the insulating sealing structure 8 includes a third corner 81 corresponding to the first corner 34, and at least one of the first corner 34 and the third corner 81 is chamfered (such as an R-chamfer or a C-chamfer). That is, only the first corner 34 may be chamfered, and the third corner 81 may be unchamfered, for example, a right angle, an acute angle, or an obtuse angle. Alternatively, only the third corner 81 may be chamfered, and the first corner 34 may be unchamfered, for example, a right angle, an acute angle, or an obtuse angle. Alternatively, both the first corner 34 and the third corner 81 are chamfered.

[0120] When the terminal post 2 is attached and fixed to the first case wall 13, the first corner 34 is likely to press the third corner 81, causing the insulating sealing structure 8 to tear at the third corner 81. Chamfering the first corner 34 increases the area over which the first corner 34 applies force to the third corner 81, dispersing the force application position and reducing the concentration of the applied force on the third corner 81, thereby reducing the risk of the insulating sealing structure 8 tearing at the third corner 81. Chamfering the third corner 81 increases the force-receiving area of ​​the third corner 81 when the first corner 34 applies force to the third corner 81, dispersing the force received by the third corner 81, thereby reducing the risk of the insulating sealing structure 8 tearing at the third corner 81. Thus, by chamfering at least one of the first corner 34 and the third corner 81, the risk of the insulating sealing structure 8 tearing at the third corner 81 can be reduced.

[0121] In some embodiments of the present application, regardless of whether at least one of the first corner 34 and the third corner 81 is chamfered or not, the first corner 34 and the third corner 81 can be arranged to have a fitting gap, thereby reducing the pressure of the first corner 34 against the third corner 81 to a certain extent and reducing the risk of tearing at the third corner 81 of the insulating sealing structure 8.

[0122] It should be noted that the third corner 81 can be chamfered regardless of whether the third corner 81 is provided with the first sub-portion 831, and the fourth corner 82 can be chamfered regardless of whether the fourth corner 82 is provided with the second sub-portion 832. Also, both the chamfer and the spacer may be provided, or either one may be provided, and this is not a limitation here.

[0123] 6, in some embodiments of the present application, the insertion portion 33 and the first extension portion 32 form a first electrode post portion 35, and the insulating sealing structure 8 includes a first insulating sealing member 85 fitted between the first electrode post portion 35 and the first case wall 13, the first insulating sealing member 85 being composed of a first portion 83 and a second portion 84. This simplifies the structure of the first insulating sealing member 85 and facilitates processing of the first insulating sealing member 85.

[0124] 6, the electrode 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, the second extension portion 38 and the first extension portion 32 extending to both the inside and outside of the first case wall 13, respectively. For example, when the first extension portion 32 extends to the outside of the first case wall 13, the second extension portion 38 extends to the inside of the first case wall 13, and when the first extension portion 32 extends to the inside of the first case wall 13, the second extension portion 38 extends to the outside of the first case wall 13. The insertion portion 33 and the second extension portion 38 form a second electrode post portion 39, and the insulating sealing structure 8 includes a second insulating sealing member 86 fitted between the second electrode post portion 39 and the first case wall 13, and the second insulating sealing member 86 and the first insulating sealing member 85 are provided separately. It will be understood that the first pole portion 35 and the second pole portion 39 share the insertion portion 33 .

[0125] As a result, the pole 2 includes a first extension portion 32 and a second extension portion 38 provided on both the inner and outer sides of the first case wall 13, so that the pole 2 and the first case wall 13 fit together more stably and reliably. Furthermore, because the insulating sealing structure 8 includes the first insulating sealing member 85 and the second insulating sealing member 86 that are provided separately, the first insulating sealing member 85 and the second insulating sealing member 86 can be attached separately, making installation easier and ensuring the insulating sealing fit effect at each point of the pole 2 and the first case wall 13.

[0126] 6 , in some embodiments, the insulating and sealing structure 8 may further include a third insulating and sealing member 87, which may be disposed between the second extension portion 38 and the case 1 and may abut against the active material-applied portion 71 of the cell assembly 7, thereby improving not only the insulation between the cell assembly 7 and the case 1 but also the fit stability between the cell assembly 7 and the case 1, and further improving the reliability of the battery cells 102. Alternatively, the third insulating and sealing member 87 may be omitted, and an insulating support (not shown) may be sleeved around the end of the active material-applied portion 71 and abut against the inner surface of the case 1, which protects the cell assembly 7 when attaching it to the case 1 and helps prevent the case 1 from getting caught on the cell assembly 7, thereby improving the insulation between the cell assembly 7 and the case 1, and further improving the fit stability between the cell assembly 7 and the case 1, and further improving the reliability of the battery cells 102.

[0127] In some embodiments of the present application, as shown in FIG. 6 , the pole 2 includes a pole body 3 and a pole cover plate 4, the pole body 3 includes a first pole portion 35 and a second pole portion 39, the first extension portion 32 extends outside the outer surface of the first case wall 13, the pole cover plate 4 covers the side of the first pole portion 35 away from the second pole portion 39, the pole body 3 is welded to the pole cover plate 4, and the material hardness of the second insulating sealing member 86 is lower than that of the second portion 84.

[0128] As a result, the material hardness of the second portion 84 is higher than that of the second insulating sealing member 86, and the second insulating sealing member 86 is more susceptible to compressive deformation than the second portion 84 and has a stronger sealing effect. However, the heat resistance of the second portion 84 is stronger than that of the second insulating sealing member 86; for example, the second portion 84 is a plastic member and the second insulating sealing member 86 is a rubber member. Therefore, when the pole body 3 and the pole cover plate 4 are welded together, the thermal impact on the second insulating sealing member 86 can be reduced as much as possible, improving the sealing reliability between the first case wall 13 and the pole 2.

[0129] In some embodiments of the present application, as shown in FIG. 12 , 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.

[0130]

[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 32, thereby improving the warpage problem of the first extension 32 and allowing the first extension 32 to firmly press the insulating sealing structure 8 and improving 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 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 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 32 can be made larger, which further improves the interchangeability 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.

[0131] 12 , 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 a groove wall of the accommodating groove 36 on the side closer to the accommodating cavity 11, connecting the accommodating cavity 11 and the accommodating groove 36. For example, if the insertion portion 33 is annular, the accommodating groove 36 is 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 located in the inner annular region of the insertion portion 33, and the communication hole 37 passes through the support portion.

[0132] 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.

[0133] 12, the side of the countersunk groove 31 facing the central axis L of the mounting hole 12 is open so as to communicate with the receiving groove 36. This improves the compactness of the fit between the pole body 3 and the pole cover plate 4, and simplifies the structure and processing of the pole cover plate 4.

[0134] In some embodiments of the present application, as shown in FIG. 12 , the battery cell 102 includes a cell assembly 7, which includes an active material application portion 71 accommodated in the accommodating cavity 11 and a conductive portion 72 connected to the active material application portion 71, and the conductive portion 72 is inserted into the communicating hole 37 so as to be at least partially accommodated in the accommodating groove 36.

[0135] It should be noted that there may be one or more communication holes 37, and the conductive portion 72 may be inserted into at least one of the communication holes 37. Illustratively, at least one communication hole 37 allows the electrolyte to flow through, for example, at least one communication hole 37 is open (i.e., the conductive portion 72 is not inserted through it), thereby allowing the electrolyte to flow without being obstructed by the conductive portion 72, or, for example, at least one communication hole 37 allows the electrolyte to flow even if the conductive portion 72 is inserted through it.

[0136] 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.

[0137] 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.

[0138] 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. 12 , the conductive portion 72 is welded to the groove wall of the receiving groove 36 that is closer to the receiving cavity 11, which can improve the fitting compactness and make the welding operation of the two easier. 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.

[0139] 13 , in some embodiments, the electrode post 2 includes a electrode post cover plate 4 covering the electrode post body 3, the electrode post cover plate 4 having a fill hole 43 that can communicate with the receiving groove 36, and the battery cell 102 further includes a sealing structure 6 for sealing the fill hole 43. In this way, when it is desired to fill the battery cell 102 with electrolyte, the sealing structure 6 is not attached to the fill hole 43 or the sealing structure 6 is set to an open state, and electrolyte can be poured into the receiving groove 36 through the fill hole 43. After filling the battery cell 102, the sealing structure 6 can be attached to the fill hole 43 or the sealing structure 6 can be switched to a closed state to seal the fill hole 43, which prevents electrolyte leakage and prevents external foreign matter from entering the receiving cavity 11 through the fill hole 43, thereby improving the reliability of the battery cell 102.

[0140] 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.

[0141] 13, 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 13 , 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.

[0146] In some embodiments of the present application, as shown in Fig. 13, the first case wall 13 is an integrally molded cover plate, or as shown in Fig. 12, 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.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 14 , 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.

[0151] 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.

[0152] A battery cell 102 according to a specific embodiment of the present application will be described below.

[0153] 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 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 in the pole 2 by burring crimping.

[0154] The insertion portion 33 and the first extension portion 32 form a first pole portion 35, and the insulating sealing structure 8 includes a first insulating sealing member 85 fitted between the first pole portion 35 and the first case wall 13, and the insertion portion 33 and the second extension portion 38 form a second pole portion 39, and the insulating sealing structure 8 includes a second insulating sealing member 86 fitted between the second pole portion 39 and the first case wall 13 and provided separately from the first insulating sealing member 85.

[0155] The connection portion between the first extension portion 32 and the insertion portion 33 has a first corner 34 facing the first case wall 13, the first case wall 13 includes a second corner 131 corresponding to the first corner 34, and the first insulating sealing member 85 includes a third corner 81 corresponding to the first corner 34 and a fourth corner 82 corresponding to the second corner 131.

[0156] The first insulating sealing member 85 is composed of a first part 83 and a second part 84, and is formed as an inseparable integral member, the first part 83 includes a first sub-part 831 located closer to the third corner 81 than the second part 84, and / or a second sub-part 832 located closer to the fourth corner 82 than the second part 84, and the material hardness of the first part 83 is lower than the material hardness of the second part 84.

[0157] During installation, the first insulating sealing member 85, the second insulating sealing member 86, and the pole 2 may first be attached to the mounting hole 12 of the first case wall 13, and then the first extension 32 may be processed by a riveting process. During this process, the pole 2 applies an acting force to the first insulating sealing member 85, and the first case wall 13 applies a reactive force to the first insulating sealing member 85. The force is concentrated at the first corner 34 and / or the second corner 131 of the first insulating sealing member 85, making them vulnerable to tearing. By using a material with a lower hardness for the third corner 81 and / or the fourth corner 82 of the first insulating sealing member 85, they can be easily compressed and deformed by the force and absorb the acting force. This reduces the risk of tearing at the vulnerable portion of the first insulating sealing member 85, which helps improve the reliability of the insulating sealing fit between the first case wall 13 and the pole 2 and the reliability of the battery cell 102. Furthermore, the first insulating sealing structure 8 uses a material with a higher hardness in areas other than the third corner 81 and the fourth corner 82 than in the corner areas, which provides a support function and makes it possible to effectively control the amount of compression of the second insulating sealing member 86, thereby achieving an effective sealing effect and improving the fitting and sealing performance between the pole 2 and the first case wall 13.

[0158] It should be noted that, unless contradictory, the embodiments and features in the embodiments in the present application can be combined with each other.

[0159] 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]

[0160] 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 131 2nd corner 14 Second Case Wall 2 poles 3 Pole body 31 Counterbore 32 1st extension part 33 Insertion part 34 First Corner 35 1st pole section 36 Storage groove 37 Communication hole 38 Second extension part 39 2nd pole column 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 Third Corner 82 4th corner 83 Part 1 831 First Subpart 8311 First side 8312 Third side 832 Second Subpart 84 Part 2 841 Second side part 842 4th side 85 First insulating sealing member 86 Second insulating sealing member 87 Third insulating sealing member 91 First spacer 92 Second spacer.

Claims

1. a first case wall having a mounting hole; 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, a connecting portion between the first extending portion and the insertion portion having a first corner facing the first case wall, the first case wall including a second corner provided corresponding to the first corner; an insulating sealing structure fitted between the first case wall and the terminal post, including a first portion and a second portion, the first portion having a lower material hardness than the second portion, and the first portion being located closer to at least one of the first corner and the second corner than the second portion; including a battery cell.

2. 2. The battery cell of claim 1, wherein the insulating sealing structure includes a third corner corresponding to the first corner, and the first portion includes a first sub-portion that is closer to the third corner than the second portion.

3. The battery cell of claim 2 , wherein the first sub-portion defines a partial outer surface of the third corner.

4. 4. The battery cell of claim 3, wherein the surface of the insulating sealing structure facing the first extension portion includes a first surface portion defined by the first sub-portion, and the surface of the insulating sealing structure facing the first extension portion further includes a second surface portion defined by the second portion, and the first surface portion exceeds or is flush with the second surface portion.

5. 5. The battery cell of claim 3, wherein the surface of the insulating sealing structure facing the insertion portion includes a third surface portion defined by the first sub-portion, and the surface of the insulating sealing structure facing the insertion portion further includes a fourth surface portion defined by the second portion, and the third surface portion exceeds or is flush with the fourth surface portion.

6. 6. The battery cell according to claim 1, wherein the insulating sealing structure includes a fourth corner corresponding to the second corner, and the first portion includes a second sub-portion that is closer to the fourth corner than the second portion.

7. The battery cell of claim 6 , wherein the second sub-portion defines a partial outer surface of the fourth corner.

8. The battery cell according to any one of claims 1 to 7, wherein the insertion portion and the insulating sealing structure have a fitting gap.

9. 9. The battery cell according to claim 1, wherein the second portion and the first portion are both ring-shaped structures extending around the entire circumferential direction of the mounting hole.

10. 10. The battery cell according to claim 1, wherein the insulating sealing structure includes a third corner corresponding to the first corner, and at least one of the first corner and the third corner is chamfered, and / or the first corner and the third corner have a fitting gap.

11. 11. The battery cell according to claim 1, wherein the insulating sealing structure includes a fourth corner corresponding to the second corner, and at least one of the second corner and the fourth corner is chamfered, and / or the second corner and the fourth corner have a fitting gap.

12. The battery cell according to any one of claims 1 to 11, wherein the battery cell includes a first spacer provided between the first extension portion and the insulating sealing structure.

13. The battery cell according to any one of claims 1 to 12, further comprising a second spacer provided between the insulating sealing structure and a surface of the first case wall facing the first extension portion, the second spacer having a material hardness lower than a material hardness of the second portion.

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

15. 15. The battery cell according to claim 1, wherein the insertion portion and the first extension portion constitute a first pole portion, the insulating sealing structure includes a first insulating sealing member fitted between the first pole portion and the first case wall, and the first insulating sealing member is composed of the first portion and the second portion.

16. 16. The battery cell of claim 15, 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 insertion portion and the second extending portion constituting a second electrode post portion, and the insulating sealing structure includes a second insulating sealing member fitted between the second electrode post portion and the first case wall and provided separately from the first insulating sealing member.

17. 17. The battery cell of claim 16, wherein the pole includes a pole body and a pole cover plate, the pole body includes the first pole portion and the second pole portion, the first extension portion extends outward from the outer surface of the first case wall, the pole cover plate covers a side of the first pole portion away from the second pole portion, the pole body is welded to the pole cover plate, and a material hardness of the second insulating sealing member is lower than a material hardness of the second portion.

18. 18. The battery cell of claim 17, wherein the first extension portion protrudes from the insertion portion toward the outside of the first case wall so as to define a countersunk groove 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 through-welded to the insertion portion, and a welded structure formed by welding is spaced apart from the first extension portion.

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

20. 20. The battery cell of claim 19, 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.

21. 21. The battery cell according to claim 19, wherein the pole includes a pole cover plate covering 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 for sealing the liquid filling hole.

22. A battery comprising the battery cell according to any one of claims 1 to 21.

23. 23. An electrical device comprising the battery of claim 22.

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