Battery cells, batteries and electrical devices

Abstract

The present invention relates to a battery cell, a battery, and an electrical device, which belong to the technical field of batteries. The battery cell includes a case, a pole body, and a pole cover plate, the case having a mounting hole and a receiving cavity defined therein, the pole body being inserted into the mounting hole and including a contact portion contacting the outside of the case, a counterbore groove formed at an end of the pole body remote from the receiving cavity, the counterbore groove being located closer to the central axis of the mounting hole than the contact portion, the pole cover plate covering the pole body and including a connecting portion connected to the pole body, the connecting portion being located in the counterbore groove and connected to a portion of the pole body located closer to the receiving cavity and spaced apart from a groove wall of the counterbore groove closer to the contact 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 202311204427.9 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 case, a pole body, and a pole cover plate, the case having a mounting hole and a storage cavity defined therein, the pole body being inserted into the mounting hole and including an abutment portion abutting against the outside of the case, a countersunk groove being formed at an end of the pole body remote from the storage cavity, the countersunk groove being located closer to the central axis of the mounting hole than the abutment portion, the pole cover plate covering the pole body and including a connection portion connected to the pole body, the connection portion being located in the countersunk groove and connected to a portion of the pole body located closer to the storage cavity, and spaced apart from a groove wall of the countersunk groove on the side closer to the abutment portion.

[0005] In the above technical solution, the connection portion is connected to a portion of the pole body that is located closer to the receiving cavity of the counterbore groove, and the connection portion is spaced apart from the groove wall closer to the abutment portion of the counterbore groove to form a gap. This not only satisfies the connection requirements between the pole cover plate and the pole body, but also allows the force generated by the connection between the pole cover plate and the pole body to be blocked by the gap, reducing the force transmitted to the abutment portion, helping to alleviate the problem of warping at the abutment portion due to this force, improving the abutment reliability between the abutment portion and the case, and further improving the connection reliability and sealing performance between the pole body and the case, thereby improving the reliability of the battery cell. Furthermore, the elimination of the warping at the abutment portion helps to alleviate the problem of warping at the abutment portion affecting the installation and connection of the current collecting member, thereby improving the smoothness and reliability of the connection between the pole cover plate and the pole cover plate. Furthermore, since the connection portion connecting the pole cover plate and the pole body is spaced apart from the groove wall on the side closer to the abutment portion of the countersunk groove, the required mounting clearance between the pole cover plate and the pole body can be reduced, the required processing accuracy of the pole cover plate can be reduced, and the compatibility of the pole body can be improved.

[0006] In some embodiments, the connection portion is welded to the portion of the pole post body that is located on the side of the counterbore closest to the receiving cavity.

[0007] In the above technical solution, the connection part and the terminal post body are connected by welding, which improves the connection reliability between the terminal post body and the terminal post cover plate, eliminates the need for other connecting parts, simplifies the structure, and reduces costs.In addition, the connection part is welded to the part of the terminal post body that is located closer to the receiving cavity of the counterbore groove, and after the formed molten pool solidifies, the connection part is spaced from the groove wall that is closer to the abutment part of the counterbore groove.This prevents the contraction stress caused by the solidification of the molten pool from being transmitted to the abutment part or is only slightly transmitted, thereby improving the problem of warping at the abutment part.

[0008] In some embodiments, the pole body includes a through-hole that is inserted into the mounting hole, and at least a portion of the connection portion is provided in the through-hole and is connected to the through-hole.

[0009] In the above technical solution, by providing at least a portion of the connecting portion in the insertion portion and connecting with the insertion portion, the insertion portion can be inserted into the mounting hole, and therefore the insertion portion can have a relatively sufficient dimension in the axial direction of the mounting hole to connect with the connecting portion, which helps to improve the connection reliability between the terminal post body and the terminal post cover plate. For example, when the connecting portion is welded to the insertion portion, it can have a sufficient penetration depth, improving the welding reliability between them.

[0010] In some embodiments, the insertion portion is formed in an annular shape, and the radial width of the connecting portion covering the pole body is smaller than the radial thickness of the insertion portion.

[0011] In the above technical solution, when the insertion part is annular, the radial width of the connecting part covering the pole body can be made smaller than the radial thickness of the insertion part, so that the radial thickness of the insertion part is sufficient to support and connect with the connecting part, thereby improving the connection reliability between the pole body and the pole cover plate. For example, when the connecting part is welded to the insertion part, the connecting part can be welded only to the insertion part, and the connecting part has a sufficient penetration width, improving the welding reliability between them.

[0012] In some embodiments, the abutment portion is connected to the thread portion and extends relative to the thread portion away from the central axis of the mounting hole, the abutment portion protruding from the thread portion away from the receiving cavity, and a countersunk groove is defined between a surface of the abutment portion proximate the central axis of the mounting hole and a surface of the thread portion away from the receiving cavity.

[0013] In the above technical solution, the counterbore groove is defined by the abutment portion and the insertion portion, which simplifies the structure of the pole body and makes it easier to design and process the counterbore groove. In addition, compared to the solution of "forming the counterbore groove by partially recessing the surface of the insertion portion facing away from the receiving cavity," the radial outer boundary of the counterbore groove can extend in a direction away from the central axis of the mounting hole, which facilitates fitting with the connecting portion of the pole cover plate and helps meet the requirement of spacing the side wall of the counterbore groove from the connecting portion.

[0014] In some embodiments, the depth of the countersunk groove in the axial direction of the mounting hole is one-third to two-thirds of the thickness of the abutting portion in the axial direction of the mounting hole.

[0015] In the above technical solution, by not making the depth of the countersunk groove too deep, sufficient thickness is ensured at the connection point between the abutment part and the insertion part, improving the structural strength of weak parts of the pole body; and by not making the depth of the countersunk groove too shallow, a relatively large amount of the connection part can be accommodated within the countersunk groove, reducing the volume of the connection part protruding outside the countersunk groove and improving the problem of the protruding connection part interfering with the installation and connection of the current collecting member.

[0016] In some embodiments, the through-hole is annular, and the side of the counterbore groove closest to the central axis of the mounting hole is open so as to communicate with the inner annular region of the through-hole.

[0017] In the above technical solution, when the insertion portion is formed in a ring shape, the side of the countersunk groove closer to the central axis of the mounting hole is open so as to communicate with the internal annular region of the insertion portion, which further simplifies the design and processing of the countersunk groove. Compared to the solution in which "when the insertion portion is formed in a ring shape, the side of the countersunk groove closer to the central axis of the mounting hole is closed," the radial inner boundary of the countersunk groove can extend in a direction approaching the central axis of the mounting hole, which facilitates fitting with the pole post cover plate and helps to simplify the structural design of the pole post cover plate.

[0018] In some embodiments, the abutment portion includes a first section and a second section arranged in sequence in a direction away from the insertion portion, and with a plane perpendicular to the axial direction of the mounting hole as the projection plane and the axial direction of the mounting hole as the projection direction, the projection of the first section on the projection plane is within the projection of the mounting hole on the projection plane, and the projection of the second section on the projection plane is outside the projection of the mounting hole on the projection plane.

[0019] In the above technical solution, the second section abuts against the case, satisfying the requirements for the abutment fit between the pole body and the case; the second section and the countersunk groove further include a first section that is not intended to abut against the case, and the first section defines the side wall of the countersunk groove, thereby alleviating the problem of warping of the second section due to the connection between the connecting part and the insertion part, and further helping to improve the reliability of the abutment fit between the abutment part and the case.

[0020] In some embodiments, the pole body has an abutment formed by burring and caulking.

[0021] In the above technical solution, the pole body can be easily processed, the counterbore groove can be easily formed, and when the contact portion is connected to the insertion portion, this helps to improve the connection reliability between the contact portion and the insertion portion, thereby improving the installation reliability between the pole body and the case.

[0022] In some embodiments, the spacing between the connection portion and the groove wall of the counterbore groove closer to the abutment portion gradually increases in a direction away from the receiving cavity.

[0023] In the above technical solution, the connecting portion can be easily fitted into the countersunk groove, and in areas with a large gap, a large gap is provided to correspond to areas where the solidification shrinkage deformation of the weld molten pool is large, which helps to further improve the problem of warping at the contact portion; and in areas with a small gap, it is advantageous to improve the structural strength of the thin-walled areas of the pole body formed by providing a recess.

[0024] In some embodiments, the cross-sectional area of ​​the counterbore gradually increases in a direction away from the receiving cavity.

[0025] In the above technical solution, the counterbore groove has a wide opening, which is convenient for fitting the connection part of the pole cover plate to the counterbore groove and improves the fitting efficiency of the pole cover plate and the pole body. In addition, the wide opening of the counterbore groove is convenient for realizing a design in which the gap between the connection part and the groove wall on the side closer to the abutment part of the counterbore groove gradually increases in the direction away from the receiving cavity.

[0026] In some embodiments, the polar post cover plate includes a cover plate body, the connecting portion is located at an edge of the cover plate body, and the surface of the cover plate body facing away from the receiving cavity protrudes from the surface of the connecting portion facing away from the receiving cavity.

[0027] In the above technical solution, the protrusion of the connection portion from the cover plate body can be prevented from interfering with the installation of the current collecting member, thereby improving the convenience of installing the current collecting member and the connection reliability between the current collecting member and the pole cover plate.

[0028] In some embodiments, the thickness of the abutment portion in the axial direction of the mounting hole is greater than the thickness of the connection portion in the axial direction of the mounting hole.

[0029] In the above technical solution, the thickness of the contact portion is greater than the thickness of the connection portion, which helps to reduce deformation of the contact portion and further improves the problem of warping of the contact portion due to the connection between the connection portion and the pole body.

[0030] In some embodiments, the thickness of the connection portion in the axial direction of the mounting hole is three-quarters to five-quarters of the depth of the counterbore groove in the axial direction of the mounting hole.

[0031] In the above technical solution, the thickness H2 of the connection part in the axial direction of the mounting hole is close to the depth H3 of the countersunk groove in the axial direction of the mounting hole, and the connection part can be almost accommodated within the countersunk groove, thereby reducing the impact of the connection part protruding from the outer surface of the abutment part and interfering with the installation of the current collecting member.

[0032] In some embodiments, the surface of the connecting portion facing away from the receiving cavity extends at an angle away from the central axis of the mounting hole and toward the receiving cavity.

[0033] In the above technical solution, the connection portion is relatively thick near the cover plate body and relatively thin near the sidewall of the countersunk groove, which simplifies the processing and forming of the connection portion of the electrode post cover plate, reduces material waste, and saves costs. Furthermore, the connection portion is relatively thick near the cover plate body and relatively thin near the sidewall of the countersunk groove, which improves the reliability of the connection between the electrode post cover plate and the electrode post body. Furthermore, the reduced thickness at the connection portion of the electrode post cover plate helps to avoid the interference of the connection between the connection portion and the electrode post body with the installation of the current collecting member. Furthermore, when the connection portion and the electrode post body are connected by laser welding, the inclined shape of the connection portion forms an angle between the laser reflection path and the laser incident path, which alleviates the problem of laser damage to the laser device due to laser reflection and provides protection for the laser device.

[0034] In some embodiments, the pole body includes a through-hole inserted into the mounting hole, the abutment portion is connected to the through-hole and extends in a direction away from the central axis of the mounting hole relative to the through-hole, the battery cell further includes an insulating sealing structure for insulating and sealing the case and the pole body to fit together, and the insulating sealing structure includes a portion provided between the through-hole and the case and a portion provided between the abutment portion and the case.

[0035] In the above technical solution, the insulating sealing structure is provided to bring the terminal body and the case into indirect contact, thereby satisfying the connection requirements for the insulating seal between the case and the terminal body, eliminating the need to design the case or terminal body as a complex composite structure for insulating sealing, and further simplifying the design and processing of the case and the terminal body. Furthermore, the insulating sealing structure includes a portion provided between the insertion portion and the case, as well as a portion provided between the abutting portion and the case, which improves the installation stability of the insulating sealing structure and the sufficiency of the insulating seal, and further improves the reliability of the insulating sealing effect of the insulating sealing structure.

[0036] In some embodiments, the connection portion between the abutment portion and the insertion portion includes a first corner facing the case, a corner located near the first corner of the case is a second corner, the insulating sealing structure includes a third corner corresponding to the first corner and a fourth corner corresponding to the second corner, and at least one of the first corner, second corner, third corner and fourth corner is chamfered.

[0037] In the above technical solution, by using a chamfer instead of a right angle, the force-receiving area or force-applying area can be increased, local pressure and stress concentration can be reduced, the risk of tearing at areas that are prone to tearing, such as the third or fourth corner of the insulating sealing structure, can be reduced, the structural stability of the insulating sealing structure can be improved, and the reliability of the insulating sealing structure in performing the insulating sealing effect can be further improved.

[0038] In some embodiments, the connection portion between the abutment portion and the insertion portion has a first corner facing the case, a corner located near the first corner of the case is a second corner, the insulating sealing structure includes a third corner located corresponding to the first corner and a fourth corner located corresponding to the second corner, and the first corner and the third corner have a mating gap, and / or the second corner and the fourth corner have a mating gap.

[0039] In the above technical solution, when the first corner and the third corner have a fitting gap, the pressure of the first corner against the third corner can be reduced, thereby reducing the risk of the insulating sealing structure tearing at the third corner.When the second corner and the fourth corner have a fitting gap, the pressure of the second corner against the fourth corner can be reduced, thereby reducing the risk of the insulating sealing structure tearing at the fourth corner.

[0040] In some embodiments, the connection portion between the abutment portion and the insertion portion has a first corner facing the case, and a corner located closer to the first corner of the case is a second corner, the insulating sealing structure 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.

[0041] In the above technical solution, when the post body is attached and fixed to the case, if the part of the insulating sealing structure that is prone to tearing is the first part, which has a relatively low material hardness, the first part will easily compress and deform when subjected to force, absorbing the force and reducing the risk of tearing at this part.

[0042] In some embodiments, the first portion includes a first sub-portion located closer to the first corner than the second portion, and the first sub-portion partially defines a surface facing the abutment portion of the insulating sealing structure and / or partially defines a surface facing the insertion portion of the insulating sealing structure.

[0043] 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 force it receives, thereby mitigating the cracking problem at that location, and also in that it is easier to assemble the first sub-part and the second part.

[0044] In some embodiments, the end connected to the abutment portion of the insertion portion and the abutment portion constitute a first pole portion, the insulating sealing structure includes a first insulating sealing member fitted between the first pole portion and the case, and a spacer member is provided between the first pole portion and the case to buffer the force applied by the first pole portion to the first insulating sealing member.

[0045] In the above technical solution, the provision of a spacer member reduces the force applied by the first pole to the first insulating sealing member, reduces damage to the first insulating sealing member, protects the first insulating sealing member, and alleviates the problem of cracking of the first insulating sealing member.

[0046] In some embodiments, a spacer member is provided between the case and the first insulating sealing member, and / or between the first pole portion and the first insulating sealing member.

[0047] In the above technical solution, the spacer member is easy to install, the manufacturing difficulty is reduced, and the first insulating sealing member can be made into an integrated member, which facilitates the processing and installation of the first insulating sealing member.

[0048] In some embodiments, the spacer member includes at least one of a first spacer, a second spacer, and a third spacer, wherein the first spacer is provided between the abutment portion and the first insulating sealing member, the second spacer is provided between the insertion portion and the first insulating sealing member, and the third spacer is provided between the first insulating sealing member and the outer surface of the case, and the material hardness of the third spacer is lower than the material hardness of the first insulating sealing member.

[0049] In the above technical solution, if a first spacer is provided between the first insulating sealing member and the abutting portion, when the pole body is attached to the case and the abutting portion presses the first insulating sealing member toward the case, the first spacer can reduce the force transmitted to the first insulating sealing member, thereby reducing damage to the first insulating sealing member.If a second spacer is provided between the first insulating sealing member and the insertion portion, when the pole body is attached to the case and the insertion portion presses the first insulating sealing member toward the case, the second spacer can reduce the force transmitted to the first insulating sealing member, thereby reducing damage to the first insulating sealing member. When a third spacer is provided between the first insulating sealing member and the case, when the pole body is attached to the case and presses the first insulating sealing member toward the case, the first insulating sealing member can transmit the acting force to the third spacer, and the third spacer has a relatively low material hardness and can compressively deform to absorb the acting force, thereby reducing the reaction force fed back to the first insulating sealing member. In this way, the first pole portion acts to buffer the acting force applied to the first insulating sealing member, and damage to the first insulating sealing member is reduced.

[0050] In some embodiments, the pole body is formed with a housing groove that opens in a direction away from the housing cavity, the countersunk groove is arranged around the housing groove and communicates with the housing groove, and the pole body has a communication hole that penetrates the groove wall on the side of the housing groove that is closer to the housing cavity and communicates between the housing cavity and the housing groove.

[0051] 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, eliminating problems such as spillage and leakage. In addition, the side walls of the receiving groove (i.e., the groove walls extending from the opening of the receiving groove toward the receiving cavity) 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 create a separate 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.

[0052] 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.

[0053] 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.

[0054] In some embodiments, the pole cover plate has a liquid filling hole that can communicate with the receiving groove, and the battery cell further includes a sealing structure for sealing the liquid filling hole.

[0055] 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.

[0056] In a second aspect, an embodiment of the present application further provides a battery cell including a case, a pole body, and a pole cover plate, the case having a mounting hole and a receiving cavity defined therein, the pole body including an insertion portion inserted into the mounting hole and an abutment portion abutting against the outside of the case, the abutment portion being connected to the insertion portion and extending relative to the insertion portion in a direction away from the central axis of the mounting hole, a countersunk groove opening in a direction away from the receiving cavity being formed between the abutment portion and the insertion portion, the pole cover plate covering the pole body, an edge of the pole cover plate being disposed in the countersunk groove and being penetration-welded to the insertion portion, and the welded structure formed by welding is spaced apart from the abutment portion.

[0057] In the above technical solution, the edge of the pole cover plate is disposed within the countersunk groove and is welded to the insertion portion, and the welded structure formed by welding is spaced apart from the abutment portion, which helps to alleviate the problem of warping at the abutment portion due to welding and improves the abutment reliability between the abutment portion and the case, as well as the connection reliability and sealing tightness between the pole body and the case, thereby improving the reliability of the battery cell.

[0058] In a third aspect, an embodiment of the present application further provides a battery cell including a case, a pole body, and a pole cover plate, the case having a mounting hole, the pole body including an abutment portion inserted into the mounting hole and abutting against the outside of the case, the pole cover plate covering the pole body and including a connection portion connected to the pole body, wherein a plane perpendicular to the axial direction of the mounting hole is the projection plane, the axial direction of the mounting hole is the projection direction, and the projection of the portion of the abutment portion abutting against the case on the projection plane is spaced apart from the projection of the connection portion on the projection plane.

[0059] In the above technical solution, the projection of the abutment part on the projection plane where it abuts the case is spaced apart from the projection of the connection part on the projection plane, which helps to alleviate the problem of warping at the abutment part due to the connection between the connection part and the pole body, improves the abutment reliability between the abutment part and the case, and further improves the connection reliability and sealing tightness between the pole body and the case, thereby improving the reliability of the battery cell.

[0060] In some embodiments, the pole body includes a through-hole inserted into the mounting hole, the abutting portion is connected to the through-hole and extends away from the central axis of the mounting hole relative to the through-hole, the projection of the abutting portion on the projection plane is partially within the range of the projection of the mounting hole on the projection plane, the projection of the connecting portion on the projection plane is within the range of the projection of the through-hole on the projection plane, and the connecting portion is provided on the through-hole and connected to the through-hole.

[0061] In the above technical solution, the connection portion can be further spaced away from the portion of the abutting portion that abuts against the case, so that the problem of warping at the portion of the abutting portion that abuts against the case can be further improved.

[0062] In a fourth aspect, an embodiment of the present application further provides a battery, including the battery cell according to any of the above solutions.

[0063] 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.

[0064] In a fifth aspect, embodiments of the present application further provide an electrical device, comprising a battery according to any of the above solutions.

[0065] 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]

[0066] In order to more clearly explain the technical solutions of the embodiments of the present application, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only illustrate some embodiments of the present application, and should not be considered as limiting the scope, and those skilled in the art can come up with other drawings based on these drawings without any creative work. [Figure 1] 1 is a structural schematic diagram of a vehicle provided in some embodiments of the present application. [Figure 2] FIG. 1 is an exploded view of the structure of a battery provided in some embodiments of the present application. [Figure 3] 1 is a structural schematic diagram of a battery cell provided in some embodiments of the present application. [Figure 4] FIG. 1 is an orthographic view of a battery cell provided in some embodiments of the present application. [Figure 5] FIG. 5 is a cross-sectional view taken along line AA in FIG. [Figure 6] FIG. 6 is a partially enlarged view of FIG. 5. [Figure 7] FIG. 7 is a partially enlarged view of a portion B indicated by a circle in FIG. [Figure 8] FIG. 8 is a partially enlarged view of a portion C indicated by a circle in FIG. [Figure 9] 1 is a cross-sectional view of a pole body and a pole cover plate provided in some embodiments of the present application; [Figure 10] FIG. 10 is a partially enlarged view of a portion D indicated by a circle in FIG. [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 partial cross-sectional view of a battery cell provided in some embodiments of the present application. [Figure 15] 1 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application. [Figure 16]1 is a cross-sectional view of a pole cover plate and a sealing structure provided in some embodiments of the present application; [Figure 17] 1 is an installation diagram of a pole cover plate and a sealing structure provided in some embodiments of the present application. [Figure 18] 1 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application. [Figure 19] 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

[0067] 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.

[0068] 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.

[0069] 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.

[0070] In the description of this application, unless otherwise clearly defined or limited, the terms "attach," "couple," "connect," "fix," etc. should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection, and may also refer to a direct connection, an indirect connection via an intermediate, or internal communication between two elements. Those skilled in the art can understand the specific meanings of the above terms in this application according to specific circumstances.

[0071] 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.

[0072] 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.

[0073] The term "plurality" as used in this application means two or more (including two).

[0074] 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.

[0075] 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.

[0076] 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.

[0077] The positive electrode sheet generally includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer being directly or indirectly applied to the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protruding from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serving as a positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector may be aluminum, and the material of the positive electrode active material layer may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, etc.

[0078] 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.

[0079] 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.

[0080] The material of the separator is not limited, and may be, for example, polypropylene or polyethylene.

[0081] In some battery cells in the related art, a pole is attached to a case, and the pole is electrically connected to a cell assembly inside the case to realize electrode output. Here, when the pole includes a pole body and a pole cover plate, the pole body is attached to the case, the pole cover plate is covered on the pole body, and the edge of the pole cover plate is welded to the edge of the pole body. When the molten pool formed by welding shrinks, it is likely to cause the edge of the pole body to warp, which adversely affects the connection reliability and sealing performance between the pole body and the case. Furthermore, when a current collecting member needs to be welded to the pole cover plate, warping of the edge of the pole body affects the attachment and connection of the current collecting member to the pole cover plate.

[0082] Therefore, an embodiment of the present application provides a battery cell including a case, a pole body, and a pole cover plate, the case having a mounting hole and a storage cavity defined therein, the pole body being inserted into the mounting hole and including an abutment portion abutting against the outside of the case, a countersunk groove being formed at an end of the pole body remote from the storage cavity, the countersunk groove being located closer to the central axis of the mounting hole than the abutment portion, the pole cover plate covering the pole body and including a connecting portion connected to the pole body, the connecting portion being located in the countersunk groove and connected to a portion of the pole body located closer to the storage cavity, and spaced apart from the groove wall of the countersunk groove on the side closer to the abutment portion.

[0083] As a result, the connection part is connected to the part of the pole body that is located closer to the accommodating cavity of the countersunk groove, and a gap is formed between the connection part and the groove wall on the side closer to the abutment part of the countersunk groove. By arranging in this manner, not only can the connection requirements between the pole cover plate and the pole body be met, but the force caused by the connection between the pole cover plate and the pole body can be blocked by the gap, reducing the force transmitted to the abutment part and helping to alleviate the problem of warping of the abutment part due to this force, improving the abutment reliability between the abutment part and the case, and further improving the connection reliability and sealing tightness between the pole body and the case, thereby improving the reliability of the battery cell.

[0084] In addition, since the problem of warping at the abutment portion can be improved, it helps to alleviate the problem of warping at the abutment portion affecting the installation and connection of the current collecting member, and improves the smoothness and reliability of the connection between the current collecting member and the electrode post cover plate. Furthermore, since the connection portion connecting the electrode post cover plate and the electrode post body is spaced from the groove wall on the side closer to the abutment portion of the counterbore groove, the installation gap requirement between the electrode post cover plate and the electrode post body can be reduced, the processing accuracy requirement for the electrode post cover plate can be reduced, and the compatibility of the electrode post body can be improved.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] In the battery 100, the multiple battery cells 102 may be connected in series, parallel, or a mixed connection. A mixed connection refers to both the multiple battery cells 102 connected in series and the multiple battery cells 102 connected in parallel. The multiple battery cells 102 may be directly connected in series, parallel, or a mixed connection, and then the integrated multiple battery cells 102 may be housed in the box 101. Of course, the battery 100 may also be formed by connecting the multiple battery cells 102 in series, parallel, or a mixed connection to form a battery module, and then integrating the multiple battery modules in series, parallel, or a mixed connection and housing them in the box 101. The battery 100 may further include other structures, for example, the battery 100 may further include a current collecting member for achieving electrical welding between the multiple battery cells 102.

[0091] 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.

[0092] An embodiment according to the first aspect of the present application provides a battery cell 102. Referring to FIGS. 4 to 6, the battery cell 102 includes a case 1 and a pole 2. The pole 2 is disposed in the case 1, and a receiving cavity 11 is formed inside the case 1. Exemplarily, the battery cell 102 includes a cell assembly 7. The cell assembly 7 may include an active material coated portion 71 and a conductive portion 72 connected to the active material coated portion 71. The active material coated portion 71 is disposed in the receiving cavity 11, and the conductive portion 72 is welded to the pole 2, thereby electrically connecting the active material coated portion 71 and the pole 2. Referring to FIGS. 6 and 7, the pole 2 includes a pole body 3 and a pole cover plate 4 covering the pole body 3. The conductive portion 72 may be welded to the pole body 3 or the pole cover plate 4. Either of these may be used to achieve electrical connection between the conductive portion 72 and the pole 2.

[0093] 6 and 7, the case 1 has a mounting hole 12, which communicates with the receiving cavity 11 when no other components are attached to the case 1. The pole body 3 is inserted into the mounting hole 12, and includes an abutment portion 32 that abuts against the outside of the case 1. That is, at least a portion of the abutment portion 32 directly or indirectly contacts the wall surface of the case 1 that faces away from the receiving cavity 11 (i.e., the outer wall surface of the case 1), thereby achieving an abutment relationship, whereby, under the stopping action of the case 1, the pole body 3 is prevented from moving relative to the case 1 in the direction of the receiving cavity 11. For example, the case 1 includes a first case wall 13, the mounting hole 12 is formed in 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 abutment portion 32 on the projection plane and the projection of the first case wall 13 on the projection plane have an overlapping area, and the part of the abutment portion 32 corresponding to the overlapping area directly or indirectly contacts the case 1, thereby realizing an abutting relationship.

[0094] It should be noted that the pole body 3 does not have to abut against the outer wall surface of the case 1 only via the abutment portion 32. For example, in some embodiments, a local structure of the pole body 3 that is located outside the case 1 and defines the groove bottom wall 312 of the countersunk groove 31 also abuts against the outer wall surface of the case 1. Therefore, in the embodiments of the present application, the pole body 3 may abut against the outer wall surface of the case 1 only via the abutment portion 32, or may simultaneously abut against the outer wall surface of the case 1 via the abutment portion 32 and portions other than the abutment portion 32.

[0095] In addition, in some embodiments of the present application, the pole body 3 may have a portion that abuts inside the case 1, that is, a portion of the pole body 3 directly or indirectly contacts the wall surface of the case 1 closer to the accommodating cavity 11 (i.e., the inner wall surface of the case 1), or the pole body 3 may not extend inside the case 1 and may only include a portion that is inserted into the mounting hole 12 and a portion that is located outside the case 1, and is not limited here.

[0096] 6 and 7, a countersunk groove 31 is formed at the end of the polar post body 3 that faces away from the accommodating cavity 11, and the countersunk groove 31 is provided close to the central axis L of the mounting hole 12 relative to the abutting portion 32. Here, the countersunk groove 31 is recessed toward the accommodating cavity 11 and opens in the direction away from the accommodating cavity 11, the opening of the countersunk groove 31 is on the surface of the polar post body 3 that faces away from the accommodating cavity 11, the countersunk groove 31 is provided around the central axis L of the mounting hole 12, and the abutting portion 32 is provided away from the central axis L of the mounting hole 12 relative to the countersunk groove 31.

[0097] 6 and 7, the pole post cover plate 4 is provided on the pole post body 3 and includes a connection portion 41 connected to the pole post body 3, the connection portion 41 being provided in the countersunk groove 31 and connected to a portion of the pole post body 3 that is located on the side of the countersunk groove 31 that is closer to the accommodating cavity 11, and the connection portion 41 is spaced apart from the groove wall on the side closer to the abutment portion 32 of the countersunk groove 31. For example, a portion of the pole post cover plate 4 may be provided on the groove bottom wall 312 of the countersunk groove 31, the groove bottom wall 312 being the surface of the countersunk groove 31 closer to the accommodating cavity 11, and the portion of the pole post cover plate 4 is connected to the pole post main body 3, for example, by welding that penetrates the groove bottom wall 312, or by bonding that adheres to the groove bottom wall 312, or by connecting via a fastening member that penetrates the groove bottom wall 312, thereby realizing the connection between the pole post cover plate 4 and the pole post main body 3, and the portion of the pole post cover plate 4 is a connection portion 41, and there is a gap S between the connection portion 41 and the groove side wall 311 of the countersunk groove 31, and the groove side wall 311 is the surface closer to the abutment portion 32 of the countersunk groove 31. It should be noted that when the part of the pole post cover plate 4 is connected to the pole post body 3 by welding that penetrates the groove bottom wall 312, the connection part 41 may be formed as a solidified structure of the molten pool, and in this case, the connection part 41 being spaced apart from the groove wall on the side closer to the abutment part 32 of the countersunk groove 31 means that the solidified structure is spaced apart from the groove wall on the side closer to the abutment part 32 of the countersunk groove 31.

[0098] As a result, the connection portion 41 is connected to the portion of the pole body 3 that is located closer to the accommodating cavity 11 of the countersunk groove 31, and a gap S is formed between the connection portion 41 and the groove wall of the countersunk groove 31 that is closer to the abutment portion 32. By arranging the connection portion 41 in this manner, not only can the connection requirements between the pole cover plate 4 and the pole body 3 be met, but the gap S can also block the force caused by the connection between the pole cover plate 4 and the pole body 3, reducing the force transmitted to the abutment portion 32. This helps to alleviate the problem of warping of the abutment portion 32 due to this force, improving the abutment reliability between the abutment portion 32 and the case 1, and further improving the connection reliability and sealing tightness between the pole body 3 and the case 1, thereby improving the reliability of the battery cell 102.

[0099] In addition, since the problem of warping of the abutting portion 32 can be improved, it is useful for alleviating the problem of warping of the abutting portion 32 affecting the attachment and connection of the current collecting member 103, improving the smoothness and reliability of the connection between the current collecting member 103 and the electrode post cover plate 4. Furthermore, since the connection portion 41 connecting the electrode post cover plate 4 and the electrode post main body 3 is spaced from the groove wall on the side closer to the abutting portion 32 of the countersunk groove 31, the attachment gap requirement between the electrode post cover plate 4 and the electrode post main body 3 can be reduced, the processing accuracy requirement for the electrode post cover plate 4 can be reduced, and the compatibility of the electrode post main body 3 can be improved.

[0100] In some embodiments of the present application, the connection part 41 is welded to a portion of the pole body 3 that is located on the side of the countersunk groove 31 that is closer to the receiving cavity 11. In this way, by connecting the connection part 41 to the pole body 3 by welding, the connection reliability between the pole body 3 and the pole cover plate 4 can be improved, other connecting parts can be omitted, the structure can be simplified, and costs can be reduced.

[0101] It should be noted that when the electrode post cover plate is welded to the groove wall close to the abutment portion of the counterbore groove to form a molten pool, the shrinkage stress due to solidification of the molten pool is directly transmitted to the abutment portion, and the solidification shrinkage stress on the side of the molten pool away from the receiving cavity is greater, which is likely to cause warping of the abutment portion.In addition, when the electrode post cover plate needs to be welded to the groove wall close to the abutment portion of the counterbore groove, it is necessary to ensure that the installation gap between the electrode post cover plate and the electrode post body meets the welding requirements, which reduces the interchangeability of the electrode post body and increases the processing accuracy requirements for the electrode post body and the electrode post cover plate.

[0102] In contrast, in the embodiment of the present application, the connection portion 41 is welded to a portion of the terminal post body 3 that is located on the side of the countersunk groove 31 that is closer to the receiving cavity 11, and after the formed molten pool solidifies, a gap is formed between the connection portion 41 and the groove wall of the countersunk groove 31 that is closer to the abutting portion 32. This prevents the shrinkage stress caused by solidification of the molten pool from being transmitted to the abutting portion 32, thereby alleviating the warpage problem of the abutting portion 32. In addition, the connection portion 41 is not butt-welded to the groove side wall 311 but is penetration-welded to the groove bottom wall 312, which eliminates the need to ensure a mounting gap between the connection portion 41 and the groove side wall 311 to meet the requirements for butt welding. This allows the gap between the connection portion 41 and the groove side wall 311 to be larger, which further improves the compatibility of the terminal post body 3 and helps to reduce the processing accuracy requirements for the terminal post cover plate 4 and the terminal post body 3.

[0103] 6 and 7, in some embodiments of the present application, the edge of the electrode post cover plate 4 is formed as a connection portion 41, that is, the connection portion 41 is located on the edge of the electrode post cover plate 4. As a result, when the connection portion 41 is used for connection with the electrode post main body 3, the electrode post cover plate 4 does not have a portion located outside the connection portion 41 that is adjacent to the groove wall on the side closer to the abutting portion 32 of the countersunk groove 31, which is located outside the connection portion 41. This further improves the problem of the force caused by the connection between the electrode post cover plate 4 and the electrode post main body 3 being transmitted to the abutting portion 32 and causing the abutting portion 32 to warp.

[0104] 6 and 7 , in some embodiments of the present application, the pole body 3 includes an insertion portion 33 inserted into the mounting hole 12, and at least a portion of the connection portion 41 is provided in the insertion portion 33 and is connected to the insertion portion 33. Here, 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 insertion portion 33 on the projection plane is within the range of the projection of the mounting hole 12 on the projection plane, and the surface of the insertion portion 33 on the side away from the accommodating cavity 11 defines at least a portion of the groove bottom wall 312 of the countersunk groove 31.

[0105] As a result, by providing at least a portion of the connecting portion 41 in the insertion portion 33 and connecting it to the insertion portion 33, the insertion portion 33 is inserted into the mounting hole 12, and the insertion portion 33 can have a relatively sufficient dimension in the axial direction of the mounting hole 12 to connect to the connecting portion 41, which helps to improve the connection reliability between the pole body 3 and the pole cover plate 4. For example, when the connecting portion 41 is welded to the insertion portion 33, a sufficient penetration depth can be achieved, improving the welding reliability between the two. Also, for example, when the insertion portion 33 is connected to the connecting portion 41 via a fastening member, the fastening member extends sufficiently deep into the insertion portion 33, improving the connection reliability between the pole body 3 and the pole cover plate 4. Furthermore, because the connection point between the connecting portion 41 and the insertion portion 33 is close to the mounting hole 12, it can be relatively far from the contact point between the abutting portion 32 and the case 1, further improving the warping problem of the abutting portion 32.

[0106] 7 , in some embodiments of the present application, the insertion portion 33 is formed in an annular shape, and the radial width D2 over which the connecting portion 41 covers the polar post body 3 is smaller than the radial thickness D1 of the insertion portion 33. Here, the radial thickness D1 is the radial thickness of one end of the insertion portion 33 that is remote from the accommodating cavity 11, and the radial width D2 is the width of one side of the insertion portion 33 along the radial direction where the connecting portion 41 covers the polar post body 3. Thus, when the insertion portion 33 is annular, by making the radial width D2 over which the connecting portion 41 covers the polar post body 3 smaller than the radial thickness D1 of the insertion portion 33, the radial thickness of the insertion portion 33 becomes sufficient to support and connect the connecting portion 41, and the connection reliability between the polar post body 3 and the polar post cover plate 4 is improved. For example, when the connection portion 41 is welded to the insertion portion 33, the connection portion 41 may be welded only to the insertion portion 33, and since the connection portion has a sufficient penetration width, the welding reliability between the two is improved.

[0107] Naturally, the present application is not limited to this, and for example, in other embodiments of the present application, when the insertion portion 33 is formed in an annular shape, the radial dimension D2 where the connecting portion 41 covers the insertion portion 33 may be larger than the radial thickness D1 of the insertion portion 33, and in this case, only a portion of the connecting portion 41 is provided in the insertion portion 33 and this portion is connected to the insertion portion 33, or a portion of the connecting portion 41 may extend to a side away from the central axis L of the mounting hole 12 of the insertion portion 33 and be connected to a corresponding portion of the polar post main body 3. In this case, the surface of the insertion portion 33 on the side away from the accommodating cavity 11 defines a part of the groove bottom wall 312 of the countersunk groove 31, and the remaining portion of the groove bottom wall 312 of the countersunk groove 31 is defined by another structure of the polar post main body 3.

[0108] For example, in some other embodiments, the pole body 3 further includes a connecting portion (not shown) connected between the abutment portion 32 and the insertion portion 33, and the connecting portion also abuts against the outer wall surface of the case 1, the connecting portion and the insertion portion 33 define the groove bottom wall 312 of the countersunk groove 31, and the connection portion 41 is provided on the connecting portion and the insertion portion 33 and is welded to the connecting portion and the insertion portion 33, respectively.

[0109] In some embodiments of the present application, referring to FIG. 7 , the abutment portion 32 is connected to the insertion portion 33 and extends in a direction away from the central axis L of the mounting hole 12 relative to the insertion portion 33, and the abutment portion 32 protrudes from the insertion portion 33 in a direction away from the accommodating cavity 11 (i.e., the surface of the abutment portion 32 facing away from the accommodating cavity 11 protrudes in a direction away from the accommodating cavity 11 relative to the surface of the insertion portion 33 facing away from the accommodating cavity 11, or simply stated, the outer surface of the abutment portion 32 faces outward and protrudes from the outer surface of the insertion portion 33), thereby defining a countersunk groove 31 between the surface of the abutment portion 32 close to the central axis L of the mounting hole 12 and the surface of the insertion portion 33 facing away from the accommodating cavity 11. In this case, the groove side wall 311 of the countersunk groove 31 can be defined by the surface of the abutment portion 32 on the side closer to the central axis L of the mounting hole 12, and the groove bottom wall 312 of the countersunk groove 31 can be defined by the surface of the insertion portion 33 on the side away from the accommodating cavity 11.

[0110] As a result, the countersunk groove 31 is defined by the abutment portion 32 and the insertion portion 33, which simplifies the structure of the pole post body 3 and facilitates the design and processing of the countersunk groove 31. Furthermore, compared to the solution of "forming the countersunk groove 31 by partially recessing the surface of the insertion portion 33 on the side away from the receiving cavity 11," the radial outer boundary of the countersunk groove 31 can extend in a direction away from the central axis L of the mounting hole 12, which facilitates fitting with the connecting portion 41 of the pole post cover plate 4 and helps meet the requirement that the groove side wall 311 of the countersunk groove 31 be spaced apart from the connecting portion 41.

[0111] 7 , in some embodiments, the depth H3 of the countersunk groove 31 in the axial direction of the mounting hole 12 is one-third to two-thirds the thickness H1 of the abutting portion 32 in the axial direction of the mounting hole 12. In other words, H3 is one-third to two-thirds of H1. By setting the depth of the countersunk groove 31 not to be too deep, a sufficient thickness is ensured at the connection point between the abutting portion 32 and the insertion portion 33, improving the structural strength of weak points in the pole body 3. Furthermore, by setting the depth of the countersunk groove 31 not to be too shallow, a relatively large amount of the connection portion 41 can be accommodated within the countersunk groove 31, reducing the volume of the connection portion 41 protruding outside the countersunk groove 31 and alleviating the problem of the protruding connection portion 41 interfering with the attachment and connection of the current collecting member 103.

[0112] In some embodiments of the present application, as shown in Figures 7 and 8, if the depth H3 of the countersunk groove 31 in the axial direction of the mounting hole 12 is smaller than the thickness H1 of the abutting portion 32 in the axial direction of the mounting hole 12, and the thickness H2 of the connecting portion 41 in the axial direction of the mounting hole 12 is close to the depth H3 of the countersunk groove 31 in the axial direction of the mounting hole 12, the connecting portion 41 can be substantially housed within the countersunk groove 31, thereby reducing the impact of the connecting portion 41 protruding from the outer surface of the abutting portion 32 on interfering with the installation of the current collecting member 103.

[0113] In some embodiments, when the insertion portion 33 is formed in an annular shape, the side of the counterbore groove 31 closer to the central axis L of the mounting hole 12 may be open so as to communicate with the inner annular region of the insertion portion 33. In this way, when the insertion portion 33 is formed in an annular shape, the side of the counterbore groove 31 closer to the central axis L of the mounting hole 12 is open so as to communicate with the inner annular region of the insertion portion 33, which further simplifies the design and processing of the counterbore groove 31. Compared to the design in which the insertion portion 33 is formed in an annular shape and the side of the counterbore groove 31 closer to the central axis L of the mounting hole 12 is closed, the radial inner boundary of the counterbore groove 31 can extend in a direction approaching the central axis L of the mounting hole 12, which facilitates fitting with the pole post cover plate 4 and helps simplify the structural design of the pole post cover plate 4.

[0114] In some embodiments, as shown in FIG. 7, the abutment portion 32 includes a first section 321 (for example, the portion to the right of the auxiliary line L1 shown in FIG. 7) and a second section 322 (for example, the portion to the left of the auxiliary line L1 shown in FIG. 7) arranged in order in a direction away from the insertion portion 33, and with a plane perpendicular to the axial direction of the mounting hole 12 as the projection plane and the axial direction of the mounting hole 12 as the projection direction, the projection of the first section 321 on the projection plane is within the projection of the mounting hole 12 on the projection plane, and the projection of the second section 322 on the projection plane is outside the projection of the mounting hole 12 on the projection plane.

[0115] This allows the second section 322 to abut against the case 1, satisfying the requirements for abutment and fitting between the pole body 3 and the case 1. Furthermore, the second section 322 and the countersunk groove 31 further have the first section 321, which is not intended to abut against the case 1, and the first section 321 defines the groove side wall 311 of the countersunk groove 31, which improves the problem of warping of the second section 322 due to the connection between the connection portion 41 and the insertion portion 33, and further helps to improve the reliability of the abutment and fitting between the abutment portion 32 and the case 1.

[0116] Naturally, the present application is not limited to this. For example, in other embodiments of the present application, the abutment portion 32 may be arranged so that all of its projections on the projection plane are outside the projection plane of the mounting hole 12. In this case, the abutment portion 32 and the insertion portion 33 may be connected via a connecting portion (not shown). In this case, the abutment portion 32 still defines the groove side wall 311 of the countersunk groove 31, but the connecting portion and the insertion portion 33 define the groove bottom wall 312 of the countersunk groove 31. The connection portion 41 is provided on the connecting portion and the insertion portion 33 and is welded to the connecting portion and the insertion portion 33, respectively.

[0117] In some embodiments of the present application, as shown in FIG. 7 , the abutment portion 32 is formed on the terminal post body 3 by burring and crimping. That is, after the terminal post body 3 is attached to the mounting hole 12, the abutment portion 32 is produced by the burring and crimping process. This makes it easier to process the terminal post body 3 and easily form the countersunk groove 31. Furthermore, when the abutment portion 32 and the insertion portion 33 are connected, this helps improve the connection reliability of the abutment portion 32 and the insertion portion 33, thereby improving the attachment reliability of the terminal post body 3 and the case 1. Of course, the present application is not limited to this. For example, in other embodiments of the present application, the terminal post body 3 may be formed by welding two parts together. For example, the two parts may be attached to the mounting holes 12, respectively, and then welded together.

[0118] 7, in some embodiments of the present application, the gap between the connecting portion 41 and the groove wall of the countersunk groove 31 on the side closer to the abutting portion 32 gradually increases in the direction away from the accommodating cavity 11 (for example, from bottom to top as shown in FIG. 7). As a result, the gap between the connecting portion 41 and the groove side wall 311 of the countersunk groove 31 gradually increases in the direction away from the accommodating cavity 11, making it easier for the connecting portion 41 to be fitted into the countersunk groove 31. In locations where the gap is large, providing a large gap corresponds to locations where solidification shrinkage deformation of the weld molten pool is large, which helps to further improve the warpage problem of the abutting portion 32. In addition, in locations where the gap is small, this is advantageous for improving the structural strength of the polar post body 3 at locations where the wall thickness is small, which is formed by providing a recessed groove. When the connection portion 41 and the insertion portion 33 are welded to form a molten pool, the shrinkage stress at the end of the molten pool that is away from the accommodating cavity 11 becomes greater, and it is understood that leaving a slightly larger gap corresponding to that point is advantageous in reducing warping of the abutment portion 32 due to heat and shrinkage stress at that point.

[0119] In some embodiments of the present application, as shown in FIG. 7 , the cross-sectional area of ​​the counterbore groove 31 gradually increases in a direction away from the receiving cavity 11 (for example, from bottom to top in FIG. 7 ). This allows the counterbore groove 31 to have a wide opening, which is useful for fitting the connection portion 41 of the electrode post cover plate 4 to the counterbore groove 31 and improves the efficiency of fitting the electrode post cover plate 4 to the electrode post main body 3. In addition, when the counterbore groove 31 has a wide opening, it is useful for realizing a design in which the gap between the connection portion 41 and the groove wall on the side closer to the abutment portion 32 of the counterbore groove 31 gradually increases in a direction away from the receiving cavity 11. It should be noted that when the cross-sectional area of ​​the counterbore groove 31 gradually increases in a direction away from the receiving cavity 11, the groove side wall 311 of the counterbore groove 31 may be a curved surface or an inclined surface, and can be specifically set according to actual circumstances.

[0120] In some embodiments of the present application, as shown in Fig. 8, the electrode post cover plate 4 includes a cover plate body 42, the connection portion 41 is located on the edge of the cover plate body 42, and the surface of the cover plate body 42 facing away from the receiving cavity 11 protrudes from the surface of the connection portion 41 facing away from the receiving cavity 11 (i.e., protrudes in the direction away from the receiving cavity 11). For example, the top surface of the cover plate body 42 shown in Fig. 8 protrudes upward relative to the top surface of the connection portion 41. This prevents the connection portion 41 from protruding from the cover plate body 42 from interfering with the installation of the current collecting member 103, thereby improving the ease of installation of the current collecting member 103 and the reliability of the connection between the current collecting member 103 and the electrode post cover plate 4.

[0121] For example, when connecting the electrode post cover plate 4 and the electrode post body 3 by welding, a sunken portion may be formed at the edge of the cover plate body 42 when the electrode post cover plate 4 is processed, and when the portion of the electrode post cover plate 4 with the sunken portion is welded to the electrode post body 3, the height of the excess fillet formed by welding to the connection portion 41 does not exceed the outer surface of the cover plate body 42. This avoids the interference that would occur when the connection portion 41 protrudes from the cover plate body 42 and affects the installation of the current collecting member 103, improving the ease of installation of the current collecting member 103 and the connection reliability between the electrode post cover plate 4 and the electrode post body 3. It should be noted that the depth of the sunken portion is not limited and may be, for example, about 0.2 mm, which avoids the excess fillet height of the weld bead and ensures a sufficient thickness of the connection portion 41, improving the connection reliability between the electrode post cover plate 4 and the electrode post body 3.

[0122] In some embodiments of the present application, as shown in Fig. 7, the electrode post cover plate 4 includes a cover plate body 42, the connection portion 41 is located on the edge of the cover plate body 42, and the surface of the cover plate body 42 facing away from the receiving cavity 11 protrudes from the surface of the abutting portion 32 facing away from the receiving cavity 11 in the direction away from the receiving cavity 11. For example, the upper surface of the cover plate body 42 shown in Fig. 7 protrudes upward relative to the upper surface of the abutting portion 32. This allows the abutting portion 32 of the electrode post body 3 to sink into the cover plate body 42, thereby preventing the protruding abutting portion 32 from interfering with the installation of the current collecting member 103, thereby improving the ease of installation of the current collecting member 103 and the reliability of the connection between the current collecting member 103 and the electrode post cover plate 4.

[0123] 7 and 8, in some embodiments, the thickness H1 of the abutting portion 32 in the axial direction of the mounting hole 12 is greater than the thickness H2 of the connecting portion 41 in the axial direction of the mounting hole 12. This makes the thickness of the abutting portion 32 greater than the thickness of the connecting portion 41, which helps to reduce deformation of the abutting portion 32 and further improves the problem of warping of the abutting portion 32 due to the connection between the connecting portion 41 and the pole body 3.

[0124] 7 and 8, in some embodiments of the present application, the thickness H2 of the connecting portion 41 in the axial direction of the mounting hole 12 is three-quarters to five-quarters of the depth H3 of the countersunk groove 31 in the axial direction of the mounting hole 12. In other words, H2 is three-quarters to five-quarters times H3. As a result, the thickness H2 of the connecting portion 41 in the axial direction of the mounting hole 12 approaches the depth H3 of the countersunk groove 31 in the axial direction of the mounting hole 12, making it possible for the connecting portion 41 to be largely accommodated within the countersunk groove 31. This reduces the impact of the connecting portion 41 protruding from the outer surface of the abutting portion 32 on interfering with the attachment of the current collecting member 103.

[0125] In some embodiments of the present application, if the thickness H2 of the connecting portion 41 in the axial direction of the mounting hole 12 is equal to or less than the depth H3 of the countersunk groove 31 in the axial direction of the mounting hole 12, it is advantageous to avoid the impact of the protruding connecting portion 41 interfering with the installation of the current collecting member 103. For example, when the connecting portion 41 is welded to the pole body 3, the depth of the countersunk groove 31 can avoid the excess fill height caused by the formation of the connecting portion 41, which is advantageous to avoid the impact of the protruding connecting portion 41 interfering with the installation of the current collecting member 103.

[0126] 9 and 10 , in some embodiments of the present application, the surface of the connecting portion 41 facing away from the receiving cavity 11 intersects with the cross section of the mounting hole 12 at an acute angle. It should be noted that when the connecting portion 41 is welded to the pole body 3, "the surface of the connecting portion 41 facing away from the receiving cavity 11 intersects with the cross section of the mounting hole 12 at an acute angle" refers to the surface of the connecting portion 41 facing away from the receiving cavity 11 intersecting with the cross section of the mounting hole 12 at an acute angle before the connecting portion 41 is welded to the pole body 3.

[0127] Specifically, the surface of connecting portion 41 facing away from accommodating cavity 11 is outer surface 411 of connecting portion 41, and because outer surface 411 of connecting portion 41 intersects with the cross section of mounting hole 12 at an acute angle, outer surface 411 of connecting portion 41 is not parallel to the cross section of mounting hole 12, nor is outer surface 411 of connecting portion 41 perpendicular to the axial direction of mounting hole 12. In this way, when the laser welds connecting portion 41 and pole body 3 in a direction parallel to central axis L of mounting hole 12, because outer surface 411 of connecting portion 41 is inclined as described above, the reflected laser does not return to the laser device in the axial direction of mounting hole 12, which alleviates the problem of the returned laser damaging the laser device and provides the effect of protecting the laser device.

[0128] For example, if the connection portion 41 of the pole cover plate 4 is made of copper, when a laser is irradiated to connect the surfaces, if the incident path of the laser is perpendicular to the surface to be connected, the reflected path of the laser will also be perpendicular to the surface to be connected, and the high reflectivity of copper will likely damage the laser device. In the above embodiment of the present application, the outer surface 411 of the connection portion 41 is not perpendicular to the incident path of the laser, so that the reflected path of the laser can be shifted from the incident path of the laser, that is, an angle can be formed between the reflected path of the laser and the incident path of the laser, thereby avoiding the problem of the reflected laser damaging the laser device.

[0129] 10 , the surface of the connecting portion 41 facing away from the receiving cavity 11 extends at an angle away from the central axis L of the mounting hole 12 and toward the receiving cavity 11. This makes the connecting portion 41 relatively thick near the cover plate body 42 and relatively thin near the groove sidewall 311 of the countersunk groove 31, which facilitates processing and forming of the connecting portion 41 of the electrode post cover plate 4, reduces material waste, and cuts costs. In addition, because the connecting portion 41 is relatively thick near the cover plate body 42 and relatively thin near the groove sidewall 311 of the countersunk groove 31, the reliability of the formed connecting portion 41 connecting the electrode post cover plate 4 and the electrode post body 3 can be improved.

[0130] In addition, since the thickness at the connection portion 41 of the pole cover plate 4 is reduced, it helps to avoid the interference effect on the installation of the current collecting member 103 caused by the connection between the connection portion 41 and the pole body 3. For example, problems such as excess height formed by welding, or increased height caused by bonding, or protrusion of fastening members caused by providing fastening members can all have an interference effect on the installation of the current collecting member 103. By reducing the thickness at the connection portion 41, the above problems can be alleviated, and the smooth installation of the current collecting member 103 and the connection reliability can be improved.

[0131] Furthermore, the surface of the connecting portion 41 that faces away from the accommodating cavity 11 extends at an angle away from the central axis L of the mounting hole 12 and toward the accommodating cavity 11, so that the outer surface 411 of the connecting portion 41 intersects with the cross section of the mounting hole 12 at an acute angle. As a result, when the connecting portion 41 is connected to the pole body 3 by laser welding, by making the connecting portion 41 in the above-mentioned inclined shape, an included angle is formed between the laser reflection path and the laser incident path, which improves the problem of damage to the laser device due to laser reflection and provides the effect of protecting the laser device.

[0132] It should also be noted that, when the outer surface 411 of the connecting portion 41 intersects the cross section of the mounting hole 12 at an acute angle, in some embodiments the outer surface 411 of the connecting portion 41 may extend at an angle away from the central axis L of the mounting hole 12 and away from the receiving cavity 11.

[0133] In some embodiments of the present application, as shown in Figures 6 and 7, the pole body 3 includes an insertion portion 33 inserted into the mounting hole 12, the abutment portion 32 is connected to the insertion portion 33 and extends in a direction away from the central axis L of the mounting hole 12 relative to the insertion portion 33, and the battery cell 102 further includes an insulating sealing structure 8 for insulating and sealing the case 1 and the pole body 3 to fit together, and the insulating sealing structure 8 includes a portion provided between the insertion portion 33 and the case 1 and a portion provided between the abutment portion 32 and the case 1.

[0134] As a result, the provision of insulating sealing structure 8 brings terminal post body 3 and case 1 into indirect contact, satisfying the connection requirements for insulating sealing between case 1 and terminal post body 3, eliminating the need to design case 1 or terminal post body 3 as a complex composite structure for insulating sealing, and further simplifying the design and processing of case 1 and terminal post body 3. Furthermore, insulating sealing structure 8 includes the portion provided between insertion portion 33 and case 1, and also the portion provided between abutting portion 32 and case 1, which improves the installation stability of insulating sealing structure 8 and the sufficiency of insulating sealing, and further improves the reliability of insulating sealing effect achieved by insulating sealing structure 8.

[0135] It should be noted that the insulating sealing structure 8 may be a single member or may be made up of multiple members, and if it is a single member, the single member may be made of the same type of material or multiple types of materials, and if it is made up of multiple members, the multiple members may be made of the same or different materials, and any of the multiple members may be made of the same type of material or multiple types of materials, and this can be flexibly configured and is not limited here.

[0136] 7, in some embodiments of the present application, the connection portion between the abutting portion 32 and the insertion portion 33 has a first corner 34 facing the case 1, the corner of the case 1 closest to the first corner 34 is a second corner 131, the insulating sealing structure 8 includes a third corner 81 corresponding to the first corner 34 and a fourth corner 82 corresponding to the second corner 131, and at least one of the first corner 34, the second corner 131, the third corner 81, and the fourth corner 82 is chamfered. Here, the chamfering may be an R-chamfer or a C-chamfer, and is not limited thereto.

[0137] By adopting a chamfer instead of a right angle, the force-receiving area or force-applying area is increased, local pressure and stress concentration is reduced, the risk of tearing at areas prone to tearing such as the third corner 81 or the fourth corner 82 of the insulating sealing structure 8 is reduced, the structural stability of the insulating sealing structure 8 is improved, and the reliability of the insulating sealing structure 8 in performing its insulating sealing effect is further improved.

[0138] For example, when the pole body 3 is attached and fixed to the case 1, 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.

[0139] For example, when the terminal post body is attached and fixed to the case 1, the second corner 131 is likely to press 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.

[0140] 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 and the third corner 81 is chamfered, the third corner 81 may be chamfered over the entire circumferential direction of the insulating sealing structure 8, or may be chamfered partially in the circumferential direction of the insulating sealing structure 8 with the remaining portions being right angles. Also, the chamfered shape of the third corner 81 at different positions in the circumferential direction of the insulating sealing structure 8 may be the same or different; for example, the third corner 81 may be round-chamfered at some positions in the circumferential direction of the insulating sealing structure 8 and C-chamfered at the remaining positions.

[0141] Similarly, when the fourth corner 82 is chamfered, the fourth corner 82 may be chamfered all around the circumference of the insulating and sealing structure 8, or may be chamfered partially around the circumference of the insulating and sealing structure 8 with the remaining portions being right angles. Furthermore, the chamfered shape of the fourth corner 82 at different positions around the circumference of the insulating and sealing structure 8 may be the same or different; for example, the fourth corner 82 may be round-chamfered at some positions around the circumference of the insulating and sealing structure 8 and C-chamfered at the remaining positions.

[0142] In some embodiments of the present application, as shown in FIG. 7, 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.

[0143] In some embodiments of the present application, as shown in FIG. 7, 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 the insulating sealing structure 8 tearing at the fourth corner 82.

[0144] 7, the first corner 34 and the third corner 81 are chamfered to have matching shapes, i.e., both the first corner 34 and the third corner 81 are C-chamfered or both are R-chamfered. This facilitates processing, facilitates surface contact between the two, helps to improve the uniformity of the mating gap between the two, and also helps to reduce the pressure of the first corner 34 against the third corner 81, thereby reducing the risk of tearing at the third corner 81 of the insulating sealing structure 8. Of course, the present application is not limited to this, and for example, the first corner 34 and the third corner 81 may have non-matching shapes.

[0145] For example, as shown in FIG. 7, the first corner 34 and the third corner 81 are both R-chamfered, and the R-chamfer radius of the first corner 34 is smaller than the R-chamfer radius of the third corner 81. This not only improves the compactness of the fit, but also increases the fit gap between the first corner 34 and the third corner 81, reducing the pressure of the first corner 34 against the third corner 81, and further reducing the risk of the insulating sealing structure 8 tearing at the position of the third corner 81.

[0146] 7 , the second corner 131 and the fourth corner 82 are chamfered to have matching shapes, i.e., both the second corner 131 and the fourth corner 82 are C-chamfered or both are R-chamfered. This facilitates processing, facilitates surface contact between the two, helps to improve the uniformity of the mating gap between the two, and also helps to reduce the pressure of the second corner 131 against the fourth corner 82, thereby reducing the risk of tearing at the position of the fourth corner 82 of the insulating sealing structure 8. Of course, the present application is not limited thereto, and for example, the second corner 131 and the fourth corner 82 may have non-matching shapes.

[0147] 7, the third corner 81 and the fourth corner 82 are both chamfered, and when the third corner 81 is R-chamfered, the fourth corner 82 is C-chamfered, thereby providing a sufficient thickness of the insulating sealing structure 8 between the third corner 81 and the fourth corner 82 and improving the insulating sealing reliability of the insulating sealing structure 8. Alternatively, when the fourth corner 82 is R-chamfered, the third corner 81 may be C-chamfered.

[0148] In some embodiments of the present application, as shown in FIG. 11 , the connection portion between the abutment portion 32 and the insertion portion 33 has a first corner 34 facing the case 1, the corner of the case 1 located closer to the first corner 34 is a 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 located closer to at least one of the first corner 34 and the second corner 131 than the second portion 84.

[0149] For example, referring to Figures 11 and 12, the first portion 83 may include at least one of a first sub-portion 831 and a second sub-portion 832, and referring to Figure 11, the first sub-portion 831 is located closer to the first corner 34 than the second portion 84, and the material hardness of the first sub-portion 831 is lower than the material hardness of the second portion 84, and referring to Figure 12, the second sub-portion 832 is located closer to the second corner 131 than the second portion 84, and the material hardness of the second sub-portion 832 is lower than the material hardness of the second portion 84.

[0150] In this way, when the terminal post body 3 is attached and fixed to the case 1, the area corresponding to the first corner 34 of the insulating sealing structure 8 is prone to tearing, and if this area is made of the first sub-portion 831, which has a relatively low material hardness, the first sub-portion 831 will easily compress and deform when subjected to force and be able to absorb the force, thereby reducing the risk of tearing at this area. Alternatively, if the area corresponding to the second corner 131 of the insulating sealing structure 8 is made of the second sub-portion 832, which has a relatively low material hardness, the second sub-portion 832 will easily compress and deform when subjected to force and be able to absorb the force, thereby reducing the risk of tearing at this area.

[0151] 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 second portion 84 may be a high-hardness insulating material such as PPS (i.e., polyphenylene sulfide, a new high-performance thermoplastic resin) or LCP (i.e., liquid crystal polymer), etc., so that the second portion 84 has high hardness and provides support, effectively controlling the compression amount of the insulating sealing material and improving sealing performance. 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., fluorocarbon rubber), or EPDM (i.e., ethylene propylene diene terpolymer rubber), so that the first portion 83 has high compression deformation performance and effectively improves the cracking problem. Furthermore, when the first part 83 includes both the first sub-part 831 and the second sub-part 832, 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 the actual situation.

[0152] 11 , the first portion 83 includes a first sub-portion 831, which is located closer to the first corner 34 than the second portion 84, and which partially defines the surface of the insulating sealing structure 8 facing the abutment portion 32 and / or the surface of the insulating sealing structure 8 facing the insertion portion 33. 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 force it receives, which is advantageous in mitigating the risk of tearing at that location. Furthermore, the difficulty of assembling the first sub-portion 831 and the second portion 84 can be reduced.

[0153] 13 and 14 , the end of the insertion portion 33 connected to the abutting portion 32 (for example, the upper end 331 of the insertion portion 33 shown in FIG. 13 ) and the abutting portion 32 constitute a first electrode post portion 35, the insulating sealing structure 8 includes a first insulating sealing member 85 fitted between the first electrode post portion 35 and the case 1, and a spacer member 9 is provided between the first electrode post portion 35 and the case 1 to buffer the acting force applied to the first insulating sealing member 85 by the first electrode post portion 35 and / or the case 1. In this way, the provision of the spacer member 9 reduces the acting force applied to the first insulating sealing member 85 by the first electrode post portion 35 and / or the reaction force applied to the first insulating sealing member 85 by the case 1, thereby reducing damage to the first insulating sealing member 85, protecting the first insulating sealing member 85, and improving the problem of cracking of the first insulating sealing member 85.

[0154] It should be noted that the installation position and buffering method of the spacer member 9 are not limited as long as they can reduce damage to the first insulating sealing member 85 during the process of attaching the electrode post body 3 to the case 1. For example, in some embodiments, as shown in Figures 13 and 14, the spacer member 9 may be provided between the case 1 and the first insulating sealing member 85 and / or between the first electrode post portion 35 and the first insulating sealing member 85. That is, the spacer member 9 may be provided at least between the case 1 and the first insulating sealing member 85 and between the first electrode post portion 35 and the first insulating sealing member 85. This facilitates attachment of the spacer member 9, reducing production difficulty and enabling the first insulating sealing member 85 to be formed as an integrated member, facilitating processing and attachment of the first insulating sealing member 85.

[0155] Of course, the present application is not limited thereto. For example, in other embodiments of the present application, the spacer member 9 may be provided at other positions. For example, the first insulating sealing member 85 may be in an assembled form. In this case, the spacer member 9 may be provided between multiple components of the first insulating sealing member 85, and the material hardness of the spacer member 9 may be lower than the material hardness of the first insulating sealing member 85. When the force caused by attaching the pole body 3 and the case 1 is applied to the first insulating sealing member 85, the spacer member 9 is compressed and deformed, and can absorb the force, thereby reducing damage to the first insulating sealing member 85 and providing the effect of protecting the first insulating sealing member 85.

[0156] 13 , in some embodiments, the spacer member 9 may include a first spacer 91 provided between the contact portion 32 and the first insulating sealing member 85. In this case, there is no limitation on the relationship between the material hardness of the first spacer 91 and the material hardness of the first insulating sealing member 85. As a result, when the contact portion 32 presses the first insulating sealing member 85 toward the case 1 (e.g., pressing the first insulating sealing member 85 in the axial direction of the mounting hole 12) during installation of the pole body 3 to the case 1, the first spacer 91 is provided between the first insulating sealing member 85 and the contact portion 32. This allows the first spacer 91 to dissipate part of the acting force, thereby reducing the acting force transmitted to the first insulating sealing member 85, and further reducing damage to the first insulating sealing member 85 and providing an effect of protecting the first insulating sealing member 85.

[0157] 14 , in some embodiments, the spacer member 9 may include a second spacer 92 provided between the insertion portion 33 and the first insulating sealing member 85. In this case, there is no limitation on the relationship between the hardness of the material of the second spacer 92 and that of the first insulating sealing member 85. As a result, when the terminal post body 3 is attached to the case 1, when the insertion portion 33 presses the first insulating sealing member 85 toward the case 1 (for example, pressing the first insulating sealing member 85 in the radial direction of the attachment hole 12), the second spacer 92 is provided between the first insulating sealing member 85 and the insertion portion 33. Therefore, the second spacer 92 can dissipate part of the acting force, thereby reducing the acting force transmitted to the first insulating sealing member 85, reducing damage to the first insulating sealing member 85 and protecting the first insulating sealing member 85.

[0158] 14 , in some embodiments, the spacer member 9 may include a third spacer 93 disposed between the first insulating sealing member 85 and the outer surface of the case 1, and the material hardness of the third spacer 93 is lower than that of the first insulating sealing member 85. As a result, when the electrode post body 3 is attached to the case 1, if the electrode post body 3 presses the first insulating sealing member 85 toward the case 1 (e.g., pressing the first insulating sealing member 85 in the axial direction of the mounting hole 12), the first insulating sealing member 85 can transmit the acting force to the third spacer 93. Since the material hardness of the third spacer 93 is relatively low, it can compressively deform and absorb the acting force, thereby reducing the reaction force fed back to the first insulating sealing member 85. In this way, the first electrode post portion 35 acts to buffer the acting force applied to the first insulating sealing member 85, reducing damage to the first insulating sealing member 85 and providing an effect of protecting the first insulating sealing member 85.

[0159] In some embodiments, the spacer member 9 may include at least two of the first spacer 91, the second spacer 92, and the third spacer 93, i.e., the spacer member 9 may include any two of the first spacer 91, the second spacer 92, and the third spacer 93, or may include all three of the first spacer 91, the second spacer 92, and the third spacer 93 at the same time, thereby protecting the first insulating sealing member 85 from multiple angles and more effectively reducing damage to the first insulating sealing member 85.

[0160] In some embodiments, when the spacer member 9 includes both a first spacer 91 and a second spacer 92, the first spacer 91 and the second spacer 92 may be formed as an integrated member, which helps to reduce the difficulty of installing and fixing the second spacer 92, enables the first spacer 91 and the second spacer 92 to be installed as an integrated unit, and further helps to improve the overall installation efficiency.

[0161] In some embodiments, when the spacer member 9 does not include the second spacer 92, a fitting gap may be provided between the first insulating sealing member 85 and the insertion portion 33. In this way, when the pole body 3 is attached to the case 1, when the insertion portion 33 presses the first insulating sealing member 85 toward the case 1 (for example, pressing the first insulating sealing member 85 in the radial direction of the attachment hole 12), a fitting gap is provided between the first insulating sealing member 85 and the insertion portion 33. This makes it difficult for the insertion portion 33 to directly press the first insulating sealing member 85, thereby further reducing the acting force transmitted to the first insulating sealing member 85, reducing damage to the first insulating sealing member 85, and providing the effect of protecting the first insulating sealing member 85.

[0162] It should be noted that in the embodiment of the present application, in order to protect the first insulating sealing member 85 and prevent problems such as tearing due to the force it receives, at least two of the above-mentioned measures of chamfering, distinguishing the materials of the first part 83 and the second part 84, and providing a spacer member 9 can be taken simultaneously, thereby more effectively protecting the first insulating sealing member 85 and improving problems such as tearing and breakage due to the force it receives.

[0163] It should be noted that the specific configuration of the insulating sealing structure 8 is not limited, and for example, in addition to the above-mentioned first insulating sealing member 85, other insulating sealing members may be included. By combining multiple insulating sealing members in this manner, it is possible to ensure the insulating sealing connection between the pole body 3 and the case 1 while also achieving other beneficial technical effects.

[0164] For example, in some embodiments, referring to FIG. 13 , the pole body 3 further includes a flange portion 38 abutting against the inside of the case 1, the flange portion 38 is connected to one end of the insertion portion 33 closer to the accommodating cavity 11, the abutting portion 32 is connected to one end of the insertion portion 33 away from the accommodating cavity 11, the end of the insertion portion 33 connected to the flange portion 38 (for example, the lower end portion 332 of the insertion portion 33 shown in FIG. 13 ) and the flange 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 case 1.

[0165] For example, the material hardness of the first insulating sealing member 85 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 first insulating sealing member 85, resulting in a stronger sealing effect. However, since the heat resistance of the first insulating sealing member 85 is stronger than that of the second insulating sealing member 86, for example, since the first insulating sealing member 85 is made of a plastic material and the second insulating sealing member 86 is made of a rubber material, when the pole body 3 and the pole cover plate 4 are welded together, the thermal influence on the second insulating sealing member 86 can be reduced as much as possible, thereby improving the sealing reliability between the case 1 and the pole body 3. It will be understood that if the abutting portion 32 warps, the amount of compression of the flange portion 38 against the second insulating sealing member 86 will be insufficient, affecting the sealing reliability.

[0166] 13 , 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 flange portion 38 and the case 1 and abut against the active material-applied portion 71 of the cell assembly 7, thereby improving the insulation between the cell assembly 7 and the case 1, improving the stability of the fit 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 wall of the case 1, thereby protecting the cell assembly 7 when attaching it to the case 1, preventing the case 1 from getting caught on the cell assembly 7, and further improving the insulation between the cell assembly 7 and the case 1, improving the stability of the fit between the cell assembly 7 and the case 1, and further improving the reliability of the battery cells 102.

[0167] In some embodiments, as shown in FIG. 15 , the pole body 3 is formed with an accommodating groove 36 that opens in a direction away from the accommodating cavity 11, i.e., the opening of the accommodating groove 36 is formed on the surface of the pole body 3 that faces away from the accommodating cavity 11, the countersunk groove 31 is provided around the accommodating groove 36 and communicates with the accommodating groove 36, and the pole body 3 has a communication hole 37 that penetrates the groove wall of the accommodating groove 36 on the side closer to the accommodating cavity 11, thereby communicating between the accommodating cavity 11 and the accommodating groove 36.

[0168] As a result, when injecting electrolyte into battery cell 102, the electrolyte can be injected into accommodating groove 36 and then flow into accommodating cavity 11 through communication hole 37. Here, accommodating groove 36 temporarily stores the electrolyte, thereby preventing problems such as spillage and leakage. Furthermore, the side walls of accommodating groove 36 (i.e., the groove walls extending from the opening of accommodating groove 36 toward accommodating cavity 11) can prevent electrolyte from spilling to a certain extent, reducing external contamination caused by the electrolyte and facilitating rapid injection. Furthermore, because there is no need to create a separate injection passage in case 1, special processing of case 1 is not required, which helps reduce the structural complexity and processing difficulty of case 1.

[0169] For example, as shown in FIG. 15 , the pole body 3 includes a through-hole 33 inserted into the mounting hole 12, the through-hole 33 being formed in a ring shape, and the accommodating groove 36 being located in the inner annular region of the through-hole 33. For example, the accommodating groove 36 may be defined by the through-hole 33 and a support portion located in the inner annular region of the through-hole 33. When the side of the countersunk groove 31 closer to the central axis L of the mounting hole 12 is open, the countersunk groove 31 can communicate with the inner annular region of the through-hole 33, i.e., can communicate with the accommodating groove 36. As a result, when the pole post cover plate 4 is fitted over the pole post main body 3, the fitting compactness between the pole post cover plate 4 and the pole post main body 3 is improved, and the cover plate main body 42 of the pole post cover plate 4 can be fitted into the accommodating groove 36 without connecting the cover plate main body 42 and the connecting portion 41 of the pole post cover plate 4 with an uneven structure, thereby improving the fitting compactness between the pole post main body 3 and the pole post cover plate 4, improving the connection reliability between the cover plate main body 42 and the connecting portion 41 of the pole post cover plate 4, and simplifying the structure of the pole post cover plate 4.

[0170] In some embodiments, as shown in FIG. 15 , 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.

[0171] 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 may be 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 may allow the electrolyte to flow even if the conductive portion 72 is inserted through it.

[0172] 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.

[0173] 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.

[0174] 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. 15 , welding the conductive portion 72 to the groove wall of the receiving groove 36 that is closer to the receiving cavity 11 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.

[0175] 15 and 16 , in some embodiments, the electrode post cover plate 4 has a liquid 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 liquid 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 liquid fill hole 43 or the sealing structure 6 is set to an open state, and the electrolyte can be poured into the receiving groove 36 through the liquid fill hole 43. After filling the liquid, the sealing structure 6 can be attached to the liquid fill hole 43 or the sealing structure 6 can be switched to a closed state to seal the liquid fill hole 43, which prevents electrolyte leakage and prevents external foreign matter from entering the receiving cavity 11 through the liquid fill hole 43, thereby improving the reliability of the battery cell 102.

[0176] 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.

[0177] 15 and 16, 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.

[0178] Here, the sealing structure 6 may be detachable or permanently fixed. For example, as shown in FIG. 17 , if the sealing structure 6 is detachable, the maintenance of the liquid inlet 43 is facilitated. For example, when it is necessary to replenish the electrolyte, the sealing structure 6 may be removed, the liquid inlet 43 may be opened, and the electrolyte may be refilled into the receiving cavity 11 through the liquid inlet 43, and then the sealing structure 6 may be reattached. Alternatively, the sealing structure 6 may be detachably connected to the electrode post cover plate 4 by, for example, a screw or a rotating engagement, to facilitate attachment and detachment. For example, as shown in FIG. 16 , if the sealing structure 6 is permanently fixed, the sealing structure 6 may be fixed to the electrode post cover plate 4 by, for example, welding or riveting, to improve the sealing reliability of the sealing structure 6 to the liquid inlet 43.

[0179] 16 , 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.

[0180] 15 and 16 , the sealing structure 6 includes a first sealing member 61 and a second sealing member 62, at least a portion of the first sealing member 61 is inserted into the liquid inlet 43 and is tightly fitted into the liquid inlet 43 to seal the liquid inlet 43, and the second sealing member 62 is located on the side of the first sealing member 61 away from the accommodating cavity 11, and an edge of the second sealing member 62 is sealed and fitted to the pole cover plate 4 by welding. This allows the first sealing member 61 to effectively seal the liquid inlet 43, and the second sealing member 62 not only seals the liquid inlet 43 but also prevents the first sealing member 61 from escaping from the liquid inlet 43, improving the sealing reliability of the sealing structure 6 for the liquid inlet 43.

[0181] For example, the first sealing member 61 may be made of a material such as plastic or rubber, which helps to improve the interference fit and sealing effect. For example, the second sealing member 62 may be made of the same metal material as the electrode post cover plate 4, such as an aluminum member, which helps to improve the welding success rate between the second sealing member 62 and the electrode post cover plate 4. It should also be noted that the welding method between the second sealing member 62 and the electrode post cover plate 4 is not limited, and may be, for example, heat fusion or soldering, or for example, pulse laser welding, which improves manufacturing efficiency and automation.

[0182] It should be noted that laser welding requires a high level of cleanliness for the injection hole 43, and if any electrolyte remains in the injection hole 43, the electrolyte will be heated and gasified, and the resulting gas will escape from the welding molten pool, causing defects such as pinholes and bursts in the welded area. In some embodiments of the present application, referring to FIG. 15 , the inlet hole 43 includes a first hole section 431, a second hole section 432, and a third hole section 433 arranged in order in the direction of inlet flow. The passage area of ​​the first hole section 431 gradually decreases from the first hole section 431 to the second hole section 432. The passage area of ​​the outlet end of the first hole section 431 is equal to or greater than the passage area of ​​the inlet end of the second hole section 432. The passage area of ​​the second hole section 432 gradually decreases from the second hole section 432 to the third hole section 433. The passage area of ​​the outlet end of the second hole section 432 is equal to the passage area of ​​the inlet end of the third hole section 433. The third hole section 433 is a uniform cross-section hole section. The first sealing member 61 is tightly fitted into the third hole section 433. This can alleviate the problem of electrolyte accumulation in the first hole section 431 and the second hole section 432 of the liquid injection hole 43, which helps improve the welding pass rate between the second sealing member 62 and the pole cover plate 4 and improves sealing performance. Of course, the present application is not limited thereto. For example, in other embodiments of the present application, the liquid injection hole 43 may omit the third hole section 433 and only include the first hole section 431 and the second hole section 432.

[0183] 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 position the first sealing member 61 in a tight fit with the injection hole 43.

[0184] In some embodiments of the present application, as shown in Fig. 15, the case 1 includes a first case wall 13, the mounting holes 12 are formed in the first case wall 13, and the first case wall 13 is an integrally formed cover plate; or as shown in Fig. 6, the case 1 further includes a second case wall 14, the first case wall 13 is integrally formed 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.

[0185] 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.

[0186] 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 opening 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 wall 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 wall 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.

[0187] An example according to a second aspect of the present application provides a battery cell 102. The battery cell 102 may include a case 1, a pole body 3, and a pole cover plate 4. The case 1 has a mounting hole 12, and a receiving cavity 11 is defined within the case 1. The pole body 3 includes an insertion portion 33 inserted into the mounting hole 12 and an abutting portion 32 abutting against the outside of the case 1. The abutting 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. A countersunk groove 31 opening in a direction away from the receiving cavity 11 is formed between the abutting portion 32 and the insertion portion 33. The pole cover plate 4 covers the pole body 3. An edge of the pole cover plate 4 is disposed within the countersunk groove 31 and is penetration-welded to the insertion portion 33. A welded structure 5 formed by welding is spaced apart from the abutting portion 32.

[0188] For example, the edge of the pole cover plate 4 has a connecting portion 41, and the connecting portion 41 is welded to the pole body 3 to form a welded structure 5. When the welded structure 5 is formed, the shrinkage stress caused by the solidification of the molten pool can be blocked by the gap and is hardly or only little transmitted to the abutting portion 32, thereby improving the warping problem of the abutting portion 32.

[0189] It should be noted that, unless there is a contradiction, the embodiments according to the first aspect of the present application can be combined with the embodiments according to the second aspect of the present application. For example, the embodiments according to the second aspect of the present application can be combined with the following technical solutions, and the technical effects of the following technical solutions can be understood by referring to the description of the embodiments according to the first aspect above, and therefore the description will be omitted.

[0190] For example, in some embodiments, the insertion portion 33 is formed in an annular shape, and the maximum radial width of the welded structure 5 is smaller than the radial thickness D1 of the insertion portion 33.

[0191] For example, in some embodiments, the depth H3 of the countersunk groove 31 in the axial direction of the mounting hole 12 is one-third to two-thirds the thickness H1 of the abutting portion 32 in the axial direction of the mounting hole 12.

[0192] For example, in some embodiments, the insertion portion 33 is formed in an annular shape, and the side of the countersunk groove 31 closer to the central axis L of the mounting hole 12 opens so as to communicate with the inner annular region of the insertion portion 33.

[0193] For example, in some embodiments, the abutment portion 32 includes a first section 321 and a second section 322 arranged in sequence in a direction away from the insertion portion 33, and with a plane perpendicular to the axial direction of the mounting hole 12 as the projection plane and the axial direction of the mounting hole 12 as the projection direction, the projection of the first section 321 on the projection plane is within the projection of the mounting hole 12 on the projection plane, and the projection of the second section 322 on the projection plane is outside the projection of the mounting hole 12 on the projection plane.

[0194] For example, in some embodiments, the pole body 3 is formed with the abutment portion 32 by burring and caulking.

[0195] For example, in some embodiments, the spacing between the welded structure 5 and the abutment portion 32 gradually increases in a direction away from the receiving cavity 11 .

[0196] For example, in some embodiments, the cross-sectional area of ​​the counterbore 31 gradually increases in a direction away from the receiving cavity 11 .

[0197] For example, in some embodiments, the pole cover plate 4 includes a cover plate body 42, and a connecting portion 41 is provided on the edge of the cover plate body 42, and the connecting portion 41 is welded to the pole body 3 to form a welded structure 5, and before welding, the surface of the cover plate body 42 facing away from the accommodating cavity 11 protrudes from the surface of the connecting portion 41 facing away from the accommodating cavity 11 in a direction away from the accommodating cavity 11.

[0198] For example, in some embodiments, the thickness H1 of the abutment portion 32 in the axial direction of the mounting hole 12 is greater than the thickness of the welded structure 5 in the axial direction of the mounting hole 12.

[0199] For example, in some embodiments, the thickness of the welded structure 5 in the axial direction of the mounting hole 12 is three-quarters to five-quarters of the depth H3 of the counterbore 31 in the axial direction of the mounting hole 12.

[0200] For example, in some embodiments, the pole cover plate 4 includes a cover plate body 42, and a connection portion 41 is provided on the edge of the cover plate body 42, and the connection portion 41 is welded to the pole body 3 to form a welded structure 5, and before welding, the surface of the connection portion 41 facing away from the accommodating cavity 11 extends in a direction away from the central axis L of the mounting hole 12 and at an incline toward the accommodating cavity 11.

[0201] For example, in some embodiments, the battery cell 102 further includes an insulating sealing structure 8 for insulating and sealing the case 1 and the pole body 3 to fit together, and the insulating sealing structure 8 includes a portion provided between the insertion portion 33 and the case 1 and a portion provided between the abutment portion 32 and the case 1.

[0202] For example, in some embodiments, the connection portion between the abutment portion 32 and the insertion portion 33 has a first corner 34 facing the case 1, the corner of the case 1 located close to the first corner 34 is a second corner 131, the insulating sealing structure 8 includes a third corner 81 located corresponding to the first corner 34 and a fourth corner 82 located corresponding to the second corner 131, and at least one of the first corner 34, the second corner 131, the third corner 81 and the fourth corner 82 is chamfered.

[0203] For example, in some embodiments, the connection portion between the abutment portion 32 and the insertion portion 33 has a first corner 34 facing the case 1, the corner of the case 1 closest to the first corner 34 is a second corner 131, the insulating sealing structure 8 includes a third corner 81 corresponding to the first corner 34 and a fourth corner 82 corresponding to the second corner 131, and there is a fitting gap between the first corner 34 and the third corner 81, and / or there is a fitting gap between the second corner 131 and the fourth corner 82.

[0204] For example, in some embodiments, the connection portion between the abutment portion 32 and the insertion portion 33 has a first corner 34 facing the case 1, the corner of the case 1 located closer to the first corner 34 is a 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 located closer to at least one of the first corner 34 and the second corner 131 than the second portion 84.

[0205] For example, in some embodiments, the first portion 83 includes a first sub-portion 831 that is located closer to the first corner 34 than the second portion 84, and the first sub-portion 831 partially defines the surface facing the abutment portion 32 of the insulating sealing structure 8 and / or partially defines the surface facing the insertion portion 33 of the insulating sealing structure 8.

[0206] For example, in some embodiments, the end of the insertion portion 33 connected to the abutment portion 32 and the abutment portion 32 form the first pole portion 35, the insulating sealing structure 8 includes a first insulating sealing member 85 fitted between the first pole portion 35 and the case 1, and a spacer member 9 is provided between the first pole portion 35 and the case 1 to buffer the force applied by the first pole portion 35 to the first insulating sealing member 85.

[0207] For example, in some embodiments, the spacer member 9 is provided between the case 1 and the first insulating sealing member 85 and / or between the first pole portion 35 and the first insulating sealing member 85.

[0208] For example, in some embodiments, the spacer member 9 includes at least one of a first spacer 91, a second spacer 92, and a third spacer 93, wherein the first spacer 91 is provided between the abutment portion 32 and the first insulating sealing member 85, the second spacer 92 is provided between the insertion portion 33 and the first insulating sealing member 85, and the third spacer 93 is provided between the first insulating sealing member 85 and the case 1, and the material hardness of the third spacer 93 is lower than the material hardness of the first insulating sealing member 85.

[0209] For example, in some embodiments, the pole post body 3 is formed with a housing groove 36 that opens in a direction away from the housing cavity 11, the countersunk groove 31 is arranged around the housing groove 36 and communicates with the housing groove 36, and the pole post body 3 has a communication hole 37 that penetrates the groove wall of the housing groove 36 on the side closer to the housing cavity 11, connecting the housing cavity 11 and the housing groove 36.

[0210] For example, in some embodiments, 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.

[0211] For example, in some embodiments, the pole cover plate 4 is formed with a liquid inlet hole 43 that can communicate with the receiving groove 36 , and the battery cell 102 further includes a sealing structure 6 for sealing the liquid inlet hole 43 .

[0212] An example according to a third aspect of the present application provides a battery cell 102. Referring to FIG. 18 , the battery cell 102 includes a case 1, a pole body 3, and a pole cover plate 4. The case 1 has a mounting hole 12. The pole body 3 is inserted into the mounting hole 12 and includes an abutting portion 32 abutting against the outside of the case 1. The pole cover plate 4 covers the pole body 3 and includes a connecting portion 41 connected to the pole body 3. With a plane perpendicular to the axial direction of the mounting hole 12 as the projection plane and the axial direction of the mounting hole 12 as the projection direction, the projection of the portion of the abutting portion 32 abutting against the case 1 on the projection plane is spaced apart from the projection of the connecting portion 41 on the projection plane.

[0213] It should be explained that the portion of the abutment portion 32 that abuts against the case 1 refers to the portion of the abutment portion 32 that comes into direct or indirect contact with the case 1; for example, the case 1 includes a first case wall 13, the mounting hole 12 is formed in 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 abutment portion 32 on the projection plane and the projection of the first case wall 13 on the projection plane have an overlapping area, and when the portion of the abutment portion 32 that corresponds to the overlapping area comes into direct or indirect contact with the case 1, this becomes the portion of the abutment portion 32 that abuts against the case 1.

[0214] As can be seen from the above, in the embodiment of the third aspect of the present application, compared to the embodiments of the first and second aspects described above, it is not necessary to provide a countersunk groove 31 in the pole body 3, and by setting the projection of the part of the abutting portion 32 abutting against the case 1 on the projection surface so that there is a gap between it and the projection of the connecting portion 41 on the projection surface, it is possible to reduce the acting force due to the connection between the connecting portion 41 and the pole body 3 that is transmitted to the part of the abutting portion 32 abutting against the case 1, and to improve the warping problem of the part of the abutting portion 32 abutting against the case 1.

[0215] It should be noted that the embodiment according to the first aspect of the present application can be combined with the embodiment according to the third aspect of the present application when the counterbore 31 is not taken into consideration and there is no contradiction. For example, the embodiment according to the third aspect of the present application can be combined with the following technical solutions, and the technical effects of the following technical solutions can be understood by referring to the description of the embodiment according to the first aspect, so the description will be omitted.

[0216] For example, in some embodiments, the pole body 3 includes an insertion portion 33 inserted into the mounting hole 12, the abutting portion 32 is connected to the insertion portion 33 and extends away from the central axis L of the mounting hole 12 relative to the insertion portion 33, the projection of the abutting portion 32 on the projection plane is partially within the range of the projection of the mounting hole 12 on the projection plane, so that the remaining part of the projection of the abutting portion 32 on the projection plane is outside the range of the projection of the mounting hole 12 on the projection plane, thereby achieving abutment with the case 1, the projection of the connecting portion 41 on the projection plane is within the range of the projection of the insertion portion 33 on the projection plane, and the connecting portion 41 is provided on the insertion portion 33 and connected to the insertion portion 33. This allows the connecting portion 41 to be further spaced away from the portion of the abutting portion 32 that abuts against the case 1, thereby further improving the warping problem at the portion of the abutting portion 32 that abuts against the case 1.

[0217] For example, in some embodiments, the connecting portion 41 is welded to the inserting portion 33. Alternatively, in other embodiments, the connecting portion 41 and the inserting portion 33 may be connected by adhesive, fasteners, or the like.

[0218] For example, in some embodiments, the edge of the pole post cover plate 4 is formed as a connection portion 41 .

[0219] For example, in some embodiments, the insertion portion 33 is formed in an annular shape, and the radial width D2 of the connecting portion 41 covering the pole body 3 is smaller than the radial thickness D1 of the insertion portion 33.

[0220] For example, in some embodiments, the pole body 3 is formed with the abutment portion 32 by burring and caulking.

[0221] For example, in some embodiments, the pole cover plate 4 includes a cover plate body 42, the connecting portion 41 is located at the edge of the cover plate body 42, and the surface of the cover plate body 42 facing away from the accommodating cavity 11 protrudes from the surface of the connecting portion 41 facing away from the accommodating cavity 11 in a direction away from the accommodating cavity 11.

[0222] For example, in some embodiments, the surface of the connecting portion 41 that faces away from the receiving cavity 11 extends in a direction away from the central axis L of the mounting hole 12 and at an incline toward the receiving cavity 11 .

[0223] For example, in some embodiments, the battery cell 102 further includes an insulating sealing structure 8 for insulating and sealing the case 1 and the pole body 3 to fit together, and the insulating sealing structure 8 includes a portion provided between the insertion portion 33 and the case 1 and a portion provided between the abutment portion 32 and the case 1.

[0224] For example, in some embodiments, the connection portion between the abutment portion 32 and the insertion portion 33 has a first corner 34 facing the case 1, the corner of the case 1 closest to the first corner 34 is a second corner 131, the insulating sealing structure 8 includes a third corner 81 corresponding to the first corner 34 and a fourth corner 82 corresponding to the second corner 131, and at least one of the first corner 34, the second corner 131, the third corner 81 and the fourth corner 82 is chamfered.

[0225] For example, in some embodiments, the connection portion between the abutment portion 32 and the insertion portion 33 has a first corner 34 facing the case 1, the corner of the case 1 closest to the first corner 34 is a second corner 131, the insulating sealing structure 8 includes a third corner 81 corresponding to the first corner 34 and a fourth corner 82 corresponding to the second corner 131, and the first corner 34 and the third corner 81 have a mating gap, and / or the second corner 131 and the fourth corner 82 have a mating gap.

[0226] For example, in some embodiments, the connection portion between the abutment portion 32 and the insertion portion 33 has a first corner 34 facing the case 1, the corner of the case 1 located closer to the first corner 34 is a 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 located closer to at least one of the first corner 34 and the second corner 131 than the second portion 84.

[0227] For example, in some embodiments, the first portion 83 includes a first sub-portion 831 that is located closer to the first corner 34 than the second portion 84, and the first sub-portion 831 partially defines the surface facing the abutment portion 32 of the insulating sealing structure 8 and / or partially defines the surface facing the insertion portion 33 of the insulating sealing structure 8.

[0228] For example, in some embodiments, the end of the insertion portion 33 connected to the abutment portion 32 and the abutment portion 32 form a first pole portion 35, the insulating sealing structure 8 includes a first insulating sealing member 85 fitted between the first pole portion 35 and the case 1, and a spacer member 9 is provided between the first pole portion 35 and the case 1 to buffer the force applied by the first pole portion 35 to the first insulating sealing member 85.

[0229] For example, in some embodiments, the spacer member 9 is provided between the case 1 and the first insulating sealing member 85 and / or between the first pole portion 35 and the first insulating sealing member 85.

[0230] For example, in some embodiments, the spacer member 9 includes at least one of a first spacer 91, a second spacer 92, and a third spacer 93, wherein the first spacer 91 is provided between the abutment portion 32 and the first insulating sealing member 85, the second spacer 92 is provided between the insertion portion 33 and the first insulating sealing member 85, and the third spacer 93 is provided between the first insulating sealing member 85 and the case 1, and the material hardness of the third spacer 93 is lower than the material hardness of the first insulating sealing member 85.

[0231] For example, in some embodiments, the pole body 3 is formed with a housing groove 36 that opens in a direction away from the housing cavity 11, the abutment portion 32 is arranged around the housing groove 36, and the pole body 3 has a communication hole 37 that penetrates the groove wall of the housing groove 36 on the side closer to the housing cavity 11, connecting the housing cavity 11 and the housing groove 36.

[0232] For example, in some embodiments, 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.

[0233] For example, in some embodiments, the pole cover plate 4 has a liquid inlet 43 that can communicate with the receiving groove 36 , and the battery cell 102 further includes a sealing structure 6 for sealing the liquid inlet 43 .

[0234] According to a fourth 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. This improves the reliability of the battery cell 102 according to the embodiment of the present application, thereby helping to improve the performance of the battery 100.

[0235] 19 , 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 is connected to the negative electrode post cover plate 4 of the next battery cell 102 via one current collecting member 103, and the negative electrode post cover plate 4 of the battery cell 102 is connected to the positive electrode post cover plate 4 of the previous battery cell 102 via another current collecting member 103.

[0236] According to a fifth embodiment of the present application, 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.

[0237] A battery cell 102 according to a specific embodiment of the present application will be described below.

[0238] 3 to 8, the battery cell 102 includes a case 1, a pole body 3, a pole cover plate 4, and a cell assembly 7. The case 1 has a mounting hole 12, and a housing cavity 11 is defined within the case 1. The pole body 3 is inserted into the mounting hole 12 and includes an insertion portion 33 inserted into the mounting hole 12 and a contact portion 32 abutting against the outside of the case 1. The contact portion 32 is connected to the insertion portion 33 and extends from the insertion portion 33 in a direction away from the central axis L of the mounting hole 12. The contact portion 32 protrudes from the insertion portion 33 in a direction away from the housing cavity 11, and a countersunk groove 31 is defined between a surface of the contact portion 32 close to the central axis L of the mounting hole 12 and a surface of the insertion portion 33 away from the housing cavity 11. An insulating sealing structure 8 is provided between the case 1 and the pole body 3 to electrically insulate and seal the case 1 and the pole body 3 when they are fitted together.

[0239] 3 to 8, the pole post cover plate 4 is covered on the pole post body 3 and includes a cover plate body 42 and a connecting portion 41, the connecting portion 41 is located on the edge of the cover plate body 42, the connecting portion 41 is provided on the insertion portion 33 and is welded and connected to the insertion portion 33, and after welding, the connecting portion 41 can be formed as a solidification structure by molten pool solidification, and the solidification structure is spaced from the groove wall on the side closer to the abutment portion 32 of the countersunk groove 31.

[0240] In the embodiment of the present application, the connection portion 41 is welded to the insertion portion 33, and after the formed molten pool solidifies, a gap is formed between the connection portion 41 and the abutment portion 32. This prevents the shrinkage stress caused by the solidification of the molten pool and reduces or eliminates its transmission to the abutment portion 32. This improves the reliability of the abutment between the abutment portion 32 and the case 1, ensures that the required compression amount of the insulating sealing structure 8 is met, and improves the sealing performance between the pole body 3 and the case 1. This effectively improves the connection reliability and sealing tightness between the pole body 3 and the case 1, thereby improving the reliability of the battery cell 102.

[0241] In addition, since the problem of warping of the abutting portion 32 can be improved, it is useful for alleviating the problem of warping of the abutting portion 32 affecting the attachment and connection of the current collecting member 103, improving the smoothness and reliability of the connection between the current collecting member 103 and the electrode post cover plate 4. Furthermore, since the connection portion 41 of the electrode post cover plate 4 that connects to the electrode post main body 3 is spaced from the groove wall on the side closer to the abutting portion 32 of the countersunk groove 31, the attachment gap requirement between the electrode post cover plate 4 and the electrode post main body 3 can be reduced, the processing accuracy requirement for the electrode post cover plate 4 can be reduced, and the compatibility of the electrode post main body 3 can be improved.

[0242] 3 to 8 , the insertion portion 33 is formed in an annular shape, the accommodating groove 36 is located in an inner annular region of the insertion portion 33, and the side of the countersunk groove 31 closer to the central axis L of the mounting hole 12 opens to communicate with the accommodating groove 36. The electrode post body 3 has a communication hole 37 that penetrates the 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. The cell assembly 7 includes an active material-coated portion 71 and a conductive portion 72, the active material-coated portion 71 is accommodated in the accommodating cavity 11, and the conductive portion 72 connects the active material-coated portion 71 to the electrode post body 3, and the conductive portion 72 is inserted into the communication hole 37 so as to be at least partially accommodated in the accommodating groove 36, and the portion of the conductive portion 72 located in the accommodating groove 36 is connected to the electrode post body 3.

[0243] 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.

[0244] It should be noted that, unless contradictory, the embodiments and features in the embodiments in the present application can be combined with each other.

[0245] 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]

[0246] 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 311 Groove side wall 312 Groove bottom wall 32 Contact part 321 Section 1 322 Section 2 33 Insertion part 331 Upper end 332 Lower end 34 First Corner 35 1st pole section 36 Storage groove 37 Communication hole 38 Flange 39 2nd pole column 4 pole cover plate 41 Connection 411 Outer surface of connection 42 Lid plate body 43 Liquid injection hole 431 First hole section 432 Second hole section 433 Third hole section S interval space 5 Welded structure 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 832 Second Subpart 84 Part 2 85 First insulating sealing member 86 Second insulating sealing member 87 Third insulating sealing member 9 Spacer member 91 First spacer 92 Second spacer 93 Third spacer.

Claims

1. a case having a mounting hole and defining an accommodation cavity therein; a pole body that is inserted into the mounting hole and includes an abutment portion that abuts against the outside of the case, the abutment portion having a counterbore groove formed at an end that is away from the accommodating cavity, the counterbore groove being located closer to a central axis of the mounting hole than the abutment portion; a pole cover plate that covers the pole body and includes a connection portion connected to the pole body, the connection portion being provided in the countersunk groove and connected to a portion of the pole body that is located on a side of the countersunk groove that is closer to the accommodating cavity, and that is spaced apart from a groove wall on a side of the countersunk groove that is closer to the abutment portion; including a battery cell.

2. The battery cell according to claim 1 , wherein the connection portion is welded to a portion of the pole body that is located on a side of the counterbore groove that is closer to the accommodating cavity.

3. 3. The battery cell according to claim 1, wherein the pole body includes an insertion portion that is inserted into the mounting hole, and at least a portion of the connection portion is provided in the insertion portion and connected to the insertion portion.

4. The battery cell according to claim 3 , wherein the insertion portion is formed in an annular shape, and the radial width of the connection portion covering the pole body is smaller than the radial thickness of the insertion portion.

5. 5. The battery cell according to claim 3, wherein the abutment portion is connected to the insertion portion and extends relative to the insertion portion in a direction away from the central axis of the mounting hole, the abutment portion protrudes from the insertion portion in a direction away from the accommodating cavity, and the countersunk groove is defined between a surface of the abutment portion close to the central axis of the mounting hole and a surface of the insertion portion away from the accommodating cavity.

6. 6. The battery cell according to claim 5, wherein the depth of the countersunk groove in the axial direction of the mounting hole is one-third to two-thirds of the thickness of the abutting portion in the axial direction of the mounting hole.

7. 7. The battery cell according to claim 3, wherein the insertion portion is formed in an annular shape, and the side of the countersunk groove closer to the central axis of the mounting hole is open so as to communicate with an internal annular region of the insertion portion.

8. the abutment portion includes a first section and a second section provided in that order in a direction away from the insertion portion, and wherein a plane perpendicular to an axial direction of the mounting hole is a projection plane, and the axial direction of the mounting hole is a projection direction, the projection of the first section on the projection plane is within the projection of the mounting hole on the projection plane, and the projection of the second section on the projection plane is outside the projection of the mounting hole on the projection plane.

9. The battery cell according to any one of claims 1 to 8, wherein the contact portion is formed on the pole body by burring and caulking.

10. The battery cell according to any one of claims 1 to 9, wherein a distance between the connection portion and a groove wall of the countersunk groove on a side closer to the abutment portion gradually increases in a direction away from the accommodating cavity.

11. The battery cell according to any one of claims 1 to 10, wherein the cross-sectional area of ​​the counterbore groove gradually increases in a direction away from the accommodating cavity.

12. The battery cell according to any one of claims 1 to 11, wherein the pole cover plate includes a cover plate body, the connection portion is located at an edge portion of the cover plate body, and the surface of the cover plate body facing away from the accommodating cavity protrudes from the surface of the connection portion facing away from the accommodating cavity.

13. The battery cell according to any one of claims 1 to 12, wherein the thickness of the abutting portion in the axial direction of the mounting hole is greater than the thickness of the connecting portion in the axial direction of the mounting hole.

14. 14. The battery cell according to claim 1, wherein the thickness of the connection portion in the axial direction of the mounting hole is three-quarters to five-quarters of the depth of the countersunk groove in the axial direction of the mounting hole.

15. The battery cell according to any one of claims 1 to 14, wherein a surface of the connection portion that faces away from the accommodating cavity extends at an angle in a direction away from the central axis of the mounting hole and in a direction approaching the accommodating cavity.

16. 16. The battery cell according to claim 1, wherein the pole body includes an insertion portion inserted into the mounting hole, the abutment portion is connected to the insertion portion and extends in a direction away from the central axis of the mounting hole relative to the insertion portion, and the battery cell further includes an insulating sealing structure for insulating and sealing the case and the pole body to fit together, and the insulating sealing structure includes a portion provided between the insertion portion and the case and a portion provided between the abutment portion and the case.

17. 17. The battery cell of claim 16, wherein the connection portion between the abutment portion and the insertion portion has a first corner facing the case, a corner of the case that is closer to the first corner is a second corner, the insulating sealing structure includes a third corner corresponding to the first corner and a fourth corner corresponding to the second corner, and at least one of the first corner, the second corner, the third corner, and the fourth corner is chamfered.

18. 18. The battery cell of claim 16, wherein the connection portion between the abutment portion and the insertion portion has a first corner facing the case, a corner of the case that is closer to the first corner is a second corner, the insulating sealing structure includes a third corner corresponding to the first corner and a fourth corner corresponding to the second corner, and a fitting gap is formed between the first corner and the third corner, and / or a fitting gap is formed between the second corner and the fourth corner.

19. 19. The battery cell of claim 16, wherein the connection portion between the abutment portion and the insertion portion has a first corner facing the case, and a corner of the case closer to the first corner is a second corner, the insulating sealing structure includes a first portion and a second portion, the first portion has a lower material hardness than the second portion, and the first portion is closer to at least one of the first corner and the second corner than the second portion.

20. 20. The battery cell of claim 19, wherein the first portion includes a first sub-portion located closer to the first corner than the second portion, and the first sub-portion partially defines a surface of the insulating sealing structure facing the abutment portion and / or a surface of the insulating sealing structure facing the insertion portion.

21. 21. The battery cell according to claim 16, wherein the end of the insertion portion connected to the abutting portion and the abutting portion constitute a first electrode pillar portion, the insulating sealing structure includes a first insulating sealing member fitted between the first electrode pillar portion and the case, and a spacer member is provided between the first electrode pillar portion and the case to buffer an acting force applied to the first insulating sealing member by the first electrode pillar portion and / or the case.

22. The battery cell according to claim 21 , wherein the spacer member is provided between the case and the first insulating sealing member, and / or between the first pole portion and the first insulating sealing member.

23. 23. The battery cell of claim 22, wherein the spacer member includes at least one of a first spacer, a second spacer, and a third spacer, the first spacer being provided between the abutment portion and the first insulating sealing member, the second spacer being provided between the insertion portion and the first insulating sealing member, and the third spacer being provided between the first insulating sealing member and the outer surface of the case, and wherein a material hardness of the third spacer is lower than a material hardness of the first insulating sealing member.

24. 24. The battery cell according to claim 1, wherein the pole post body has a housing groove formed therein that opens in a direction away from the housing cavity, the countersunk groove is provided around the housing groove and communicates with the housing groove, and the pole post body has a communication hole that penetrates a groove wall of the housing groove on a side closer to the housing cavity and communicates with the housing groove.

25. 25. The battery cell of claim 24, 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.

26. The battery cell according to claim 24 or 25, wherein the electrode post 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.

27. a case having a mounting hole and defining an accommodation cavity therein; a pole post body including an insertion portion inserted into the mounting hole and an abutment portion abutting against the outside of the case, the abutment portion being connected to the insertion portion and extending in a direction away from the central axis of the mounting hole relative to the insertion portion, and a countersunk groove being formed between the abutment portion and the insertion portion, the countersunk groove opening in a direction away from the accommodating cavity; a pole post cover plate that covers the pole post body, has an edge that is provided in the counterbore groove and is welded to the insertion portion, and has a welded structure formed by welding that is spaced apart from the abutting portion; including a battery cell.

28. a case having a mounting hole; a pole body including a contact portion that is inserted into the mounting hole and contacts the outside of the case; a pole cover plate that covers the pole body and includes a connection part connected to the pole body, the projection of the part of the abutting part that abuts against the case on the projection plane being spaced apart from the projection of the connection part on the projection plane, with a plane perpendicular to the axial direction of the mounting hole as a projection plane and the axial direction of the mounting hole as a projection direction; including a battery cell.

29. 29. The battery cell of claim 28, wherein the pole body includes an insertion portion inserted into the mounting hole, the abutment portion is connected to the insertion portion and extends in a direction away from the central axis of the mounting hole relative to the insertion portion, a projection of the abutment portion on the projection surface is partially within a range of a projection of the mounting hole on the projection surface, a projection of the connection portion on the projection surface is within a range of a projection of the insertion portion on the projection surface, and the connection portion is provided on the insertion portion and connected to the insertion portion.

30. A battery comprising the battery cell of any one of claims 1 to 29.

31. 31. An electrical device comprising the battery of claim 30.

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