Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization device, and relates to the technical field of batteries. The battery monomer comprises a shell assembly, an electrode assembly and a pole post assembly, the pole post assembly comprises a pole post main body and an adapter, the adapter is welded with a first shell wall, at least one identification part is formed on the side surface of the adapter away from the accommodating cavity, the identification part is arranged between the outer circumferential edge of the pole post main body and the outer circumferential edge of the adapter in the radial direction of the adapter, the identification part is configured to be visually detected and identified, the surface roughness of the identification part is smaller than the surface roughness of the remaining part of the side surface of the adapter away from the accommodating cavity except the identification part, and the surface roughness of the remaining part of the side surface of the adapter away from the accommodating cavity except the identification part is smaller than the surface roughness of the outer circumferential wall of the adapter. Therefore, the position grasping accuracy of the outer circumferential edge of the adapter can be improved through the identification part, the welding quality of the adapter and the first shell wall is improved, and the reliability of the battery monomer is improved.

Description

Technical Field

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

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

[0003] This application provides a battery cell, a battery device, and an electrical device, which helps to improve the reliability of the battery cell.

[0004] In a first aspect, embodiments of this application provide a battery cell, the battery cell comprising: a housing assembly having a receiving cavity and a first housing wall forming the receiving cavity; an electrode assembly housed in the receiving cavity; and a terminal assembly mounted on the first housing wall, comprising a terminal body and an adapter, the terminal body being electrically connected to the electrode assembly, the adapter surrounding the terminal body and insulatingly engaging with the terminal body, and the outer periphery of the adapter being welded to the first housing wall, wherein at least one identification portion is formed on the side surface of the adapter facing away from the receiving cavity, and the identification portion is spaced between the outer periphery of the terminal body and the outer periphery of the adapter in the radial direction of the adapter, the identification portion being configured to be visually detectable and identifiable, wherein the surface roughness of the identification portion is less than the surface roughness of the remaining portion of the side surface of the adapter facing away from the receiving cavity excluding the identification portion, and the surface roughness of the remaining portion of the side surface of the adapter facing away from the receiving cavity excluding the identification portion is less than the surface roughness of the outer periphery of the adapter.

[0005] In the above technical solution, because the surface roughness of the identification part is relatively smaller than that of the outer peripheral wall of the adapter, the light reflected from the identification part to the visual inspection system is more concentrated, so as to form a clearer reflected image for accurate identification by the visual inspection system. Therefore, the position of the outer peripheral wall of the adapter obtained based on the position of the identification part can also be more accurate, thereby improving the accuracy of obtaining the position of the outer peripheral wall of the adapter and improving the accuracy of the welding trajectory between the adapter and the first shell wall. During the welding process between the adapter and the first shell wall, it is easier to guide the welding device to more accurately align the adapter and the first shell wall for welding, improve the welding defects such as shrinkage cavities and cracks caused by misalignment during welding, improve the welding reliability between the shell assembly and the adapter, thereby improving the sealing and connection strength between the shell assembly and the terminal assembly, and improving the reliability of the battery cell.

[0006] In some embodiments, the surface roughness Ra of the identification part is less than or equal to 6.3 μm.

[0007] In the above technical solution, by setting the surface roughness Ra of the identification part to be less than or equal to 6.3μm, it is convenient to simultaneously take into account the accurate identification of the identification part and the ease of processing.

[0008] In some embodiments, the identification portion is formed as a straight line segment or a curved segment, and the identification portion is parallel to the corresponding portion of the outer periphery of the adapter.

[0009] In the above technical solution, by setting the identification part to be a straight line segment or a curved segment, the extension length of the identification part is small, which simplifies the structure of the identification part, reduces the processing difficulty of the identification part, and allows for good flexibility in the placement of the identification part, especially when the length of the adapter is greater than the width of the adapter (e.g., the outer periphery of the adapter is formed as an oblong, rectangular, or elliptical shape). The length direction of the adapter is consistent with the length direction of the pole body. The radial distance between the outer periphery of the adapter and the outer periphery of the pole body in the length direction of the adapter is greater than the radial distance between the outer periphery of the adapter and the outer periphery of the pole body in the width direction of the adapter. The connector provides ample space for the identification unit on both sides of the pole body, facilitating its installation without increasing the outer perimeter of the connector. By aligning the identification unit with the corresponding portion of the connector's outer perimeter, and since the position of the connector's outer perimeter is determined by the position of the identification unit, this arrangement simplifies the calculation and analysis process of obtaining the position of the connector's outer perimeter from the position of the identification unit. After obtaining the accurate position of the identification unit, the position of the connector's outer perimeter can be obtained by moving a certain distance outward along the radial direction of the connector. This also allows for obtaining the shape of the portion of the connector's outer perimeter that is radially opposite to the identification unit, facilitating faster acquisition of the welding trajectory.

[0010] In some embodiments, the distance between the identification portion and the outer periphery of the adapter is not less than 2 mm in the radial direction of the adapter.

[0011] In the above technical solution, by setting the radial distance W1 between the identification part and the outer periphery of the adapter to be no less than 2mm, it is easy to make the identification part and the outer periphery of the adapter have a suitable radial distance, which makes it easier to provide sufficient operating space for welding, reduce the interference risk between the weld between the adapter and the first shell wall and the identification part, reduce the interference risk between the vision inspection system and the welding device during operation, and thus improve the production convenience of battery cells.

[0012] In some embodiments, the width of the identification portion in the radial direction of the adapter is not less than 0.5 mm.

[0013] In the above technical solution, by setting the width W2 of the identification part to be no less than 0.5mm, it is convenient to take into account both the processing convenience and the identification of the identification part. In other words, if the width of the identification part is too small, the identification difficulty will increase, and the processing requirements will also be higher. If the width of the identification part is too large, it will easily increase the radial dimension of the adapter and the radial dimension of the pole assembly, which is not conducive to improving the energy density of the battery cell.

[0014] In some embodiments, the height of the identification portion in the axial direction of the adapter is not less than 0.1 mm and not more than 1 mm.

[0015] In the above technical solution, by setting the height H of the identification part to be no less than 0.1mm, it is convenient to take into account both the processing convenience and the identification of the identification part, and to meet the mechanical process requirements. In other words, if the height of the identification part is too small, the identification difficulty will increase, and the processing requirements will also be higher. If the height of the identification part is too large, it is easy to increase the weakening of the adapter / it is easy to increase the axial dimension of the adapter, which is not conducive to improving the energy density of the battery cell.

[0016] In some embodiments, the pole assembly further includes a first insulating member disposed on the adapter and located on the side of the adapter facing the receiving cavity. The side of the adapter facing the receiving cavity has a plurality of mating holes. The first insulating member has a plurality of protrusions that are mated and fixed to the corresponding mating holes. In a direction perpendicular to the axial direction of the adapter, the distance between the identification portion and the mating hole is not less than 1 mm.

[0017] In the above technical solution, by setting a first insulating component, the adapter and electrode assembly can be isolated to a certain extent, thereby reducing the risk of short circuit between the electrode assembly and the adapter. Simultaneously, the protrusion of the first insulating component engages with a mating hole on the adapter, facilitating positioning between the first insulating component and the adapter, simplifying assembly, and enabling subsequent fixation. Furthermore, by setting the distance W3 between the identification part and the mating hole to be no less than 1mm, a suitable radial distance is achieved between the identification part and the mating hole. This mitigates the problem of significant weakening of the adapter due to the concentration of the identification part and the mating hole when the identification part is formed as a groove on the adapter, thus improving the structural reliability of the adapter. Since the first insulating component and the adapter are fixedly connected at the mating hole, the aforementioned distance helps reduce the impact of the connection at the mating hole on the identification part, improving the structural and dimensional stability of the identification part and thus enhancing identification accuracy.

[0018] In some embodiments, the protrusion is thermally riveted to the corresponding mating hole.

[0019] In the above technical solution, by setting a protrusion for hot riveting and fixing it to the corresponding mating hole, it is easy to achieve a reliable connection between the first insulating part and the adapter, so that the connection position of the two can withstand a large force. Moreover, the process is simple to operate and can adapt to the connection of various materials without imposing too many restrictions on the material selection of the first insulating part and the adapter.

[0020] In some embodiments, the adapter includes a first adapter portion and a second adapter portion, the first adapter portion being clamped on the side of the pole body facing away from the receiving cavity, the second adapter portion being clamped on the side of the pole body facing the receiving cavity, the outer edge of the first adapter portion being welded to the second adapter portion, and the weld seam of the first adapter portion and the second adapter portion being located inside the mating hole in the radial direction of the adapter.

[0021] In the above technical solution, by setting the weld seams of the first adapter part and the second adapter part to be located on the radial inner side of the mating hole, the weld seams of the first adapter part and the second adapter part and the identification part have a suitable distance in the radial direction. This helps to reduce the impact of the welding between the first adapter part and the second adapter part on the identification part, and helps to improve the structural and dimensional stability of the identification part, so as to achieve accurate grasping of the position of the identification part.

[0022] In some embodiments, the adapter includes a first adapter portion and a second adapter portion. The first adapter portion is clamped on the side of the pole body facing away from the receiving cavity, and the second adapter portion is clamped on the side of the pole body facing the receiving cavity. The outer edge of the first adapter portion is welded to the second adapter portion. In the radial direction of the adapter, the weld seam of the first adapter portion and the second adapter portion is located inside the identification portion, and the radial distance between the weld seam of the first adapter portion and the second adapter portion and the identification portion is not less than 1 mm.

[0023] In the above technical solution, by setting the radial distance between the weld seam of the first transition part and the second transition part and the identification part to be not less than 1mm, the weld seam of the first transition part and the second transition part and the identification part have a suitable distance in the radial direction. This helps to reduce the impact of the welding between the first transition part and the second transition part on the identification part, and helps to improve the structural and dimensional stability of the identification part, so as to achieve accurate grasping of the position of the identification part.

[0024] In some embodiments, the identification portion is formed as a recess in the adapter, or the identification portion is formed as a protrusion protruding from the adapter.

[0025] In the above technical solution, by setting the identification part to be formed as a groove or a protrusion, the identification part has a simple structure and is easy to process. It does not overly complicate the structure of the battery cell, nor does it excessively increase the processing difficulty and processing cost of the battery cell.

[0026] In some embodiments, the identification portion is formed in a square, semi-circular, racetrack-shaped, elliptical, triangular, or chamfered rectangle on the longitudinal section of the adapter.

[0027] In the above technical solutions, by setting the recognition part to be square, semi-circular, racetrack-shaped, elliptical, triangular, or chamfered rectangle, the shape of the recognition part can be flexibly set, which is beneficial to adapting to the differentiated needs of different scenarios. It can be understood that in the longitudinal section of the adapter, for the solutions where the recognition part is formed as semi-circular, racetrack-shaped, elliptical, or chamfered rectangle, the adjacent two surfaces of the recognition part can be smoothly transitioned, which helps to improve the stress concentration problem at the recognition part.

[0028] In some embodiments, the identification portion is integrally extruded onto the adapter.

[0029] In the above technical solution, by setting the identification part to be integrally extruded into the adapter, it is beneficial to improve the processing efficiency and processing accuracy of the identification part, and at the same time, it is easy to improve the surface roughness of the identification part, so that the surface roughness of the identification part is less than the surface roughness of other parts of the adapter.

[0030] In some embodiments, the identification portion is a plurality of portions and is arranged at circumferential intervals along the adapter.

[0031] In the above technical solution, by setting multiple identification units at intervals along the circumference of the adapter, a complete welding trajectory can be obtained more accurately through multiple identification units, thereby improving the accuracy of the entire welding trajectory and further enhancing the welding reliability between the adapter and the first shell wall.

[0032] In some embodiments, the outer periphery of the adapter is formed into a circular structure, and two of the plurality of identification portions are radially opposite each other along the adapter.

[0033] In the above technical solution, when the outer periphery of the adapter is formed into a circular structure, two of the multiple identification parts are radially opposite each other along the adapter, which makes it easier to distribute the two identification parts more dispersed, so as to improve the accuracy of obtaining the position of the entire outer periphery of the adapter through multiple identification parts, which is beneficial to improving the accuracy of obtaining the entire welding trajectory.

[0034] In some embodiments, the adapter engages with the first housing wall via a positioning structure to restrict rotation of the adapter about its central axis relative to the housing assembly.

[0035] In the above technical solution, by setting the adapter and the first shell wall to cooperate through a positioning structure, the rotation of the adapter relative to the shell assembly is restricted by the positioning structure, that is, the rotation of the adapter relative to the first shell wall is restricted, which facilitates the positioning of the adapter and the first shell wall. At the same time, the setting of the positioning structure can make each of the multiple recognition units have a specific position, which corresponds to the information of the relative position between the recognition unit and the outer periphery of the adapter built into the vision inspection system, so that the position of the outer periphery of the adapter can be accurately obtained after the position of the recognition unit is obtained.

[0036] In some embodiments, the outer periphery of the adapter is formed into a long strip structure, and the two ends of the adapter in the length direction are respectively corresponding to the identification portion.

[0037] In the above technical solution, by setting the outer periphery of the adapter to be a long strip structure, and the two ends of the adapter in the length direction are respectively equipped with identification parts. Since the length of the adapter is greater than the width of the adapter, the error between the two ends of the adapter in the length direction and the corresponding position of the first shell wall is relatively larger than the error in the width direction. Therefore, the two ends of the adapter in the length direction are more prone to light deflection and welding defects. By setting identification parts on the corresponding length direction edges, the accuracy of obtaining the position of the two ends of the adapter in the length direction can be improved, thereby facilitating the improvement of the overall welding strength.

[0038] In some embodiments, the outer periphery of the adapter is formed as an elongated oval, and includes two oppositely arranged straight edges and two oppositely arranged arcuate edges, each of the arcuate edges corresponding to a recognition portion parallel to it; or, the outer periphery of the adapter is formed as an ellipse, and includes two oppositely arranged first long edges and two oppositely arranged first short edges, each of the first short edges corresponding to a recognition portion parallel to it; or, the outer periphery of the adapter is formed as a rectangle, and includes two oppositely arranged second long edges and two oppositely arranged second short edges, each of the second short edges corresponding to a recognition portion parallel to it.

[0039] In the above technical solution, the identification parts at both ends along the length of the adapter can be applied to adapters with different structural forms, and the structural design is flexible.

[0040] In some embodiments, the outer periphery of the adapter includes two oppositely arranged long sides and two oppositely arranged short sides, the short sides extending in an arc shape, the identification portion being arranged parallel to the short sides, and the central angle of the identification portion being not less than 30° and not more than 90°.

[0041] In the above technical solution, by setting the identification part parallel to the short side, since the position of the outer periphery of the adapter is obtained based on the position of the identification part, the above setting simplifies the calculation and analysis process of obtaining the position of the short side of the adapter from the position of the identification part. After obtaining the accurate position of the identification part, the position of the short side of the adapter can be obtained by moving a certain distance outward along the radial direction of the adapter. At the same time, the shape of the short side of the adapter can also be obtained, which facilitates faster acquisition of the welding trajectory. By setting the central angle α of the identification part to be no less than 30° and no more than 90°, it is easy to simultaneously take into account the parallel setting of the identification part and the short side, as well as the recognizability and processing convenience of the identification part. It can be understood that if α is too large, the extension length of the identification part will be too long, the processing difficulty of setting the identification part parallel to the short side will be relatively large, and the concentricity of the identification part and the short side will be relatively difficult to control. If α is too small, the extension length of the identification part will be too short, which will increase the recognition difficulty and limit the capture accuracy.

[0042] In some embodiments, the housing assembly includes a housing body and a housing cover. One end of the housing body in the axial direction of the adapter is an open end. The housing cover is disposed on the open end and is formed as the first housing wall. The edge of the adapter has a connecting portion. The end of the connecting portion near the housing cover has an overlapping portion. The end of the housing cover near the pole assembly has a stepped portion. The overlapping portion overlaps the side of the stepped portion away from the receiving cavity and is welded to the stepped portion.

[0043] In the above technical solution, by setting the overlapping part to overlap on the side of the step portion away from the receiving cavity, that is, by setting the overlapping part to overlap on the outside of the step portion, the pole post assembly can be placed on the housing cover in the direction from the outside to the inside, which facilitates the assembly of the pole post assembly to the housing cover. Moreover, through the overlapping and cooperation of the overlapping part and the step portion, the pole post assembly and the housing cover can be reliably positioned. During the welding process, the cooperation between the adapter and the housing cover is more stable, thereby improving the welding quality of the adapter and the housing cover.

[0044] In some embodiments, the pole assembly further includes a first insulating member disposed on the adapter and located on the side of the adapter facing the receiving cavity, and the connecting portion is located radially outside the first insulating member in the radial direction of the adapter.

[0045] In the above technical solution, since the connecting part is located on the radial outer side of the first insulating part, the radial dimension of the first insulating part is relatively small and it is recessed relative to the adapter. Therefore, when the pole assembly is covered with the shell cover from the outer side to the inner side to achieve overlapping, the recessed first insulating part will not cause assembly interference, which is conducive to the smooth assembly of the pole assembly.

[0046] In some embodiments, the battery cell further includes an insulating support disposed on the housing and located within the receiving cavity. The insulating support includes a first portion located radially in the adapter between the first insulating member and the housing body.

[0047] In the above technical solution, the overall size of the electrode assembly is relatively smaller than that of the housing cover, which helps to shorten the length of the electrode tabs, reduce the space occupied by the electrode tabs in the receiving cavity, and reduce problems such as damage and inversion caused by electrode tab redundancy. Moreover, by installing the insulating bracket on the housing cover, the installation of the insulating bracket is convenient. For example, the insulating bracket can be fixed to the housing cover first, and then the housing cover and housing body can be assembled together.

[0048] In some embodiments, the electrode assembly includes an active material coating portion disposed within the receiving cavity, and a conductive portion connecting the active material coating portion and the electrode body. The conductive portion includes an electrode tab connected to the active material coating portion. The insulating support further includes a second portion extending from the first portion toward the active material coating portion to isolate the electrode assembly from the active material coating portion.

[0049] In the above technical solution, by setting the second part, it is possible to reduce the risk of short circuit caused by the part of the conductive part being inserted into the active material coating part when the conductive part is inserted into the electrode assembly side of the second part while achieving the connection between the conductive part and the electrode body. This is beneficial to further improve the reliability of the battery cell.

[0050] In some embodiments, the pole assembly further includes a seal that seals between the pole body and the adapter.

[0051] In the above technical solution, the pole assembly itself has sealing capability, so there is no need to consider sealing issues when connecting the pole assembly and the housing assembly. This reduces the sealing pressure on the housing assembly when connected to the pole assembly, thus protecting the housing assembly.

[0052] In some embodiments, the electrode body passes through the adapter and includes an inner clamping portion and an outer clamping portion. The outer clamping portion is clamped on the side of the adapter away from the interior of the housing assembly, and the inner clamping portion is clamped on the side of the adapter closer to the interior of the housing assembly. The seal is clamped between the inner clamping portion and the adapter. The electrode assembly further includes a second insulating member clamped between the outer clamping portion and the adapter. The identification portion is exposed outside the second insulating member.

[0053] In the above technical solution, by clamping the adapter with the electrode body, the seal can be sealed from the side near the receiving cavity, which can more effectively prevent electrolyte leakage from the mating position between the electrode body and the adapter, thus improving reliability; moreover, the setting of the second insulating part will not cover the identification part and will not affect the identification of the identification part.

[0054] In some embodiments, the adapter defines a through hole, the pole body includes a first pole portion and a second pole portion, the first pole portion is a single piece and includes a through portion and the inner clamping portion, the second pole portion is a single piece and includes the outer clamping portion, the through portion passes through the through hole, one end of the through portion near the interior of the housing assembly is connected to the inner clamping portion, and one end of the through portion away from the interior of the housing assembly is welded to the outer clamping portion. The sealing member is disposed at the through hole and surrounds the through portion to clamp between the edge of the adapter near the through hole and the inner clamping portion, and the welding position between the through portion and the inner clamping portion is relative to the sealing member near the central axis of the through portion.

[0055] In the above technical solution, by setting the pole body as described above and arranging the welding positions between the through part and the inner clamping part and the relative positions of the sealing element, the sealing element can be reliably clamped after the first pole part and the second pole part are welded. The rebound force of the sealing element is not likely to cause the welding positions of the first pole part and the second pole part to separate and loosen, thereby improving the sealing reliability. In addition, the welding positions of the first pole part and the second pole part are on the outside, which makes the welding operation easier and ensures the welding quality.

[0056] Secondly, embodiments of this application also provide a battery device, including a battery cell of any of the above-described solutions.

[0057] In the above technical solution, the reliability of the battery cell according to the embodiment of this application is improved, which is beneficial to improving the performance of the battery device.

[0058] Thirdly, embodiments of this application also provide an electrical device, including a battery device according to any of the above-described solutions.

[0059] In the above technical solution, the improved performance of the battery device is beneficial to improving the power consumption performance of the electrical device. Attached Figure Description

[0060] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0061] Figure 1 The electrical device provided in some embodiments of this application is a structural schematic diagram of a vehicle;

[0062] Figure 2 Exploded views of battery devices provided in some embodiments of this application;

[0063] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0064] Figure 4 for Figure 3 An enlarged view of part A, shown in the center circle;

[0065] Figure 5 for Figure 3 The diagram shows the assembly of the first shell wall and the pole post assembly.

[0066] Figure 6 for Figure 5 A partial enlarged view of the first shell wall and pole assembly shown;

[0067] Figure 7 for Figure 3 A partial cross-sectional view of the battery cell described herein;

[0068] Figure 8 for Figure 7 An enlarged view of section B, shown in the center circle;

[0069] Figure 9 for Figure 3 Another partial cross-sectional view of the battery cell described herein;

[0070] Figure 10 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0071] Figure 11 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0072] Figure 12 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0073] Figure 13 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0074] Figure 14 A schematic diagram of an adapter provided in some embodiments of this application;

[0075] Figure 15 A schematic diagram of the assembly of the first shell wall and the pole post assembly provided for some embodiments of this application;

[0076] Figure 16A schematic diagram of the assembly of the first shell wall and the pole post assembly provided for some embodiments of this application;

[0077] Figure 17 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0078] Figure 18 for Figure 9 The diagram shows the assembly process of a single battery cell.

[0079] Figure 19 for Figure 17 The diagram shows the assembly process of a single battery cell.

[0080] Figure label:

[0081] Electrical device 1000, battery device 100, controller 200, motor 300

[0082] Box body 101, first box section 1011, second box section 1012, box body bottom plate 1013

[0083] Battery cell 102,

[0084] Housing assembly 1, receiving cavity 10, first housing wall 11, mounting hole 110, housing body 12, stepped portion 132, housing cover 13, electrode assembly 2, conductive portion 21, electrode tab portion 211, bending section 212, first extension section 2121, second extension section 2122, transition section 2123, opening groove 212a, active material coating portion 22.

[0085] 3. Pole post assembly

[0086] The components include: pole body 31, first pole part 31a, second pole part 31b, inner clamping part 311, outer clamping part 312, through part 313, adapter 32, straight edge 32a, curved edge 32b, long side 32c, short side 32d, first long side 32e, first short side 32f, second long side 32g, second short side 32h, through hole 32i, identification part 321, mating hole 322, connecting part 323, and overlapping part 3231.

[0087] First transition section 324, second transition section 325

[0088] First insulating component 33, protrusion 331

[0089] Seal 34, Second Insulation 35

[0090] Insulating bracket 4, first part 41, second part 42, through hole 420, support part 421, pressing part 422

[0091] Insulating film 5. Detailed Implementation

[0092] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0093] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0094] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0095] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to direct connection or indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0096] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0097] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0098] In this application, "multiple" means two or more, including two.

[0099] In this application, the battery cell may include lithium-ion rechargeable batteries (rechargeable batteries are battery cells that can be recharged after discharge to activate the active materials and continue to be used), lithium-ion primary batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this application embodiment is not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and this application embodiment is not limited to these. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this application embodiment is not limited to these.

[0100] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. Exemplarily, the battery device may include a housing for encapsulating one or more battery cells, or one or more battery modules, the housing preventing liquids or other foreign matter from affecting the charging or discharging of the battery cells. Of course, the battery device may also not include a housing.

[0101] For example, a single battery cell includes a casing, an electrode assembly, and an electrolyte (which may be a solid electrolyte layer located between the positive and negative electrodes in a solid-state battery). The electrode assembly includes at least one cell assembly, and both the cell assembly and the electrolyte are housed within the casing. The cell assembly includes a positive electrode, a negative electrode, and a separator (this structure may be omitted in solid-state batteries). The single battery cell primarily functions by the movement of metal ions between the positive and negative electrodes.

[0102] The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0103] The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc.

[0104] The separator can be made of PP, polypropylene, PE, polyethylene, etc. The electrode assembly mentioned in the embodiments of this application has a wound or stacked structure.

[0105] The materials of the casing include, but are not limited to, aluminum, steel, plastic, or other materials resistant to electrolyte corrosion.

[0106] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via busbars.

[0107] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0108] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing. Alternatively, the battery device may not include a housing.

[0109] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module into the housing. Alternatively, the battery cell assembly can be housed in a housing by directly fixing multiple battery cells to the housing.

[0110] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, battery devices, as the power source, play an irreplaceable and crucial role. Among these, battery devices, as core components of new energy vehicles, have high requirements for reliability.

[0111] Some battery cells in related technologies include a housing assembly and a terminal assembly. The terminal assembly is set on the housing assembly. The terminal assembly includes a terminal body. The terminal body is electrically connected to the electrode assembly housed in the housing assembly on one side and to the busbar component outside the housing assembly on the other side. Thus, the busbar component can realize the connection of multiple battery cells in the battery device. The busbar component can be a busbar to meet the electrical connection requirements between multiple battery cells.

[0112] To fix the electrode body, the electrode assembly can be equipped with an adapter. The adapter is annular and surrounds the electrode body. This annular adapter exposes a portion of the inner surface of the electrode body to meet the electrical connection requirements between the electrode body and the electrode assembly. The annular adapter also exposes a portion of the outer surface of the electrode body to meet the electrical connection requirements between the electrode body and the busbar component outside the housing assembly.

[0113] To secure the housing assembly and the terminal assembly, a welding fit is used between the first shell wall of the housing assembly and the adapter. The adapter is tightly connected to the first shell wall, thus securing the terminal assembly and simultaneously sealing the battery cell, encapsulating the electrode assembly and electrolyte within the housing assembly. However, the welding between the first shell wall and the adapter may exhibit welding defects such as shrinkage cavities and cracks at the weld seam due to light polarization, resulting in insufficient connection strength and sealing performance to meet usage requirements.

[0114] For example, the first shell wall and the transition structure use a T-joint. The joint of the transition structure overlaps the joint of the first shell wall, completing the pre-welding preparation. Then, laser welding is used, employing a high-energy-density laser beam as a heat source. By controlling parameters such as the width, energy, peak power, and repetition frequency of the laser pulse, the overlap melts, forming a weld, thus achieving welding. Specifically, the laser beam irradiates the interface area formed by the joint of the transition structure and the joint of the first shell wall. The energy of the laser beam is absorbed by the joints on both sides of the interface area and converted into heat energy. When the temperature reaches the melting point of the material, the joint material on both sides of the interface area begins to melt, forming a weld.

[0115] Laser welding equipment includes a laser welding unit and a vision inspection unit. For example, the vision inspection unit includes a CCD (Charge-Coupled Device) camera. The CCD camera captures image information of the junction area, and through image processing and analysis, identifies the position and shape of the junction area, obtaining the welding trajectory. This guides the welding head of the laser welding unit to align with the position of the junction area (or the calibration offset position of the junction area) for welding. Since the shape of the junction area surrounds the entire circumference of the transition structure, the laser welding head is guided to move circumferentially along the junction area, forming a complete circumferential weld.

[0116] However, the visual inspection device struggles to capture a clear reflection image of the boundary area, resulting in unclear image capture. This leads to a significant deviation of the laser position from the ideal position during subsequent laser welding. Polarized light during welding causes welding defects such as shrinkage cavities and cracks, reducing the sealing and connection strength between the housing assembly and the terminal assembly. It may even lead to welding failure, affecting the reliability of the battery cell.

[0117] In view of this, this application proposes a battery cell, which includes: a housing assembly, an electrode assembly, and a terminal assembly. The housing assembly has a receiving cavity and a first housing wall that participates in forming the receiving cavity. The electrode assembly is received in the receiving cavity. The terminal assembly is mounted on the first housing wall and includes a terminal body and an adapter. The terminal body is electrically connected to the electrode assembly. The adapter surrounds the terminal body and is insulated from the terminal body. The outer periphery of the adapter is welded to the first housing wall. At least one identification portion is formed on the side surface of the adapter facing away from the receiving cavity. In the radial direction of the adapter, the identification portions are spaced between the outer periphery of the terminal body and the outer periphery of the adapter. The identification portions are configured to be visually detectable and identifiable. The surface roughness of the identification portion is less than the surface roughness of the remaining portion of the side surface of the adapter facing away from the receiving cavity, excluding the identification portion. The surface roughness of the remaining portion of the side surface of the adapter facing away from the receiving cavity, excluding the identification portion, is less than the surface roughness of the outer periphery of the adapter.

[0118] In the above technical solution, because the surface roughness of the identification part is relatively smaller than that of the outer peripheral wall of the adapter, the light reflected from the identification part to the visual inspection system is more concentrated, so as to form a clearer reflected image for accurate identification by the visual inspection system. Therefore, the position of the outer peripheral wall of the adapter obtained based on the position of the identification part can also be more accurate, thereby improving the accuracy of the position acquisition of the outer peripheral wall of the adapter and the accuracy of the welding trajectory between the adapter and the first shell wall. During the welding process between the adapter and the first shell wall, it is easier to guide the welding device to more accurately align the adapter and the first shell wall for welding, improve the welding defects such as shrinkage cavities and cracks caused by misalignment during welding, improve the welding reliability between the shell assembly and the adapter, thereby improving the sealing and connection strength between the shell assembly and the terminal assembly, and improving the reliability of the battery cell.

[0119] The technical solutions described in the embodiments of this application are applicable to battery cells, battery devices containing battery cells, and electrical devices using battery devices.

[0120] Electrical devices can be, but are not limited to, vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0121] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0122] Please refer to Figure 1 , Figure 1 The electrical device 1000 provided in some embodiments of this application is a structural schematic diagram of a vehicle. The vehicle is equipped with a battery device 100, which may be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, the battery device 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0123] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0124] In some embodiments, the housing 101 of the battery device 100 may be part of the vehicle's chassis structure. For example, a portion of the housing 101 may be at least a portion of the vehicle's floor, or a portion of the housing 101 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0125] Please refer to Figure 2 , Figure 2 The image shows an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a battery cell 102 and a housing 101 for housing the battery cell 102. The housing 101 can have various structural forms.

[0126] In some embodiments, the housing 101 may include a first housing portion 1011 and a second housing portion 1012, which overlap each other, and together define a receiving space for accommodating the battery cell 102. A sealing material may also be provided at the connection point between the first housing portion 1011 and the second housing portion 1012 to achieve a sealed connection between them.

[0127] For example, refer to Figure 2The first box section 1011 and the second box section 1012 can both be hollow structures with an opening on one side. The opening side of the first box section 1011 covers the opening side of the second box section 1012, thus forming a box 101 with a storage space. Alternatively, the second box section 1012 can be a hollow structure with an opening on one side, and the first box section 1011 can be a lid that covers the opening side of the second box section 1012. The box 101 can have various shapes, such as a cylindrical box or a cuboid box.

[0128] As an example, the housing 101 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 101 forms a closed space to accommodate the battery cells 102; the first housing section 1011 may be either the top cover or the bottom plate.

[0129] In the battery device 100, there can be one or more battery cells 102. If there are multiple battery cells 102, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 102 are connected in both series and parallel configurations. Multiple battery cells 102 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 102 is housed in the housing 101. Alternatively, multiple battery cells 102 can first be connected in series, in parallel, or in a mixed configuration to form a battery module, and then multiple battery modules can be connected in series, in parallel, or in a mixed configuration to form an entire assembly, which is then housed in the housing 101. In some embodiments, multiple battery cells 102 can be electrically connected through a busbar component to achieve parallel, series, or mixed configurations of the multiple battery cells 102.

[0130] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery cell 102 provided in some embodiments of this application. The battery cell 102 is in the form of a cuboid, with its height direction being the third direction Z, its length direction being the first direction X, and its thickness direction being the second direction Y. The first direction X, the second direction Y, and the third direction Z are all mutually perpendicular; however, this is not a limitation. The battery cell 102 in the embodiments of this application may also be cylindrical or other shapes.

[0131] In the following description of this application, the length direction of the first shell wall 11, i.e. the length direction of the adapter 32, is taken as the first direction X, the width direction of the first shell wall 1111, i.e. the width direction of the adapter 32, is taken as the second direction Y, and the thickness direction of the first shell wall 1111, i.e. the axial direction of the adapter 32, is taken as the third direction Z. Other embodiments can be easily understood by those skilled in the art after reading the following description.

[0132] Please refer to Figure 3 , Figures 7-9In some embodiments of this application, the battery cell 102 includes a housing assembly 1, an electrode assembly 2, and a terminal assembly 3.

[0133] Exemplarily, the housing assembly 1 includes a housing body 12 and a housing cover 13. The housing cover 13 closes onto the opening of the housing body 12 to isolate the internal environment of the battery cell 102 from the external environment. The shape of the housing cover 13 may be adapted to the shape of the housing body 12 to fit the housing body 12. Optionally, the housing cover 13 may be made of a material with a certain hardness and strength, such as aluminum alloy, so that the housing cover 13 is less prone to deformation under pressure and impact, enabling the battery cell 102 to have higher structural strength and improved reliability. The electrode assembly 3 may be disposed on the housing body 12 or the housing cover 13, and the electrode assembly 3 may be used to output or input electrical energy to the battery cell 102. The housing body 12 is an assembly used to fit the housing cover 13 to form the internal environment of the battery cell 102, wherein the formed internal environment may be used to accommodate the electrode assembly 2, electrolyte, and other components. The housing 12 and the cover 13 can be independent components. An opening can be provided on the housing 12, and the cover 13 can be used to close the opening to form the internal environment of the battery cell 102. Alternatively, the cover 13 and the housing 12 can be integrated. Specifically, the cover 13 and the housing 12 can form a common connection surface before other components are installed in the housing. When it is necessary to encapsulate the inside of the housing 12, the cover 13 can be used to close the housing 12.

[0134] In some embodiments of this application, the housing assembly 1 has a receiving cavity 10. The housing assembly 1 includes a first housing wall 11, which helps to form the receiving cavity 10. The terminal assembly 3 is mounted on the first housing wall 11. Exemplarily, the terminal assembly 3 is mounted on the first housing wall 11, and the first housing wall 11 has a mounting hole 110. The terminal assembly 3 is disposed at the mounting hole 110. Here, "the terminal assembly 3 is mounted on the first housing wall 11" means that there is an assembly connection between the terminal assembly 3 and the first housing wall 11, such as welding or riveting. Thus, the housing assembly 1 and the terminal assembly 3 are separate components, assembled together. This allows for separate processing of the housing assembly 1 and the terminal assembly 3, facilitating their processing and also aiding in the manufacturing of the battery cell 102. Of course, in other examples, a portion of the housing assembly 1 and a portion of the terminal assembly 3 can also be integrally formed.

[0135] The electrode assembly 3 includes an electrode body 31 and an adapter 32. The electrode body 31 is electrically connected to the electrode assembly 2 housed in the receiving cavity 10. For example, the electrode assembly 2 may include a tab portion 211 and an active material coating portion 22. The active material coating portion 22 is connected to the electrode body 31 via the tab portion 211. The connection between the tab portion 211 and the electrode body 31 can be direct or indirect, for example, the tab portion 211 is electrically connected to the electrode body 31 via the adapter 32. The electrode assembly 2 can be in a wound or stacked form. The portion of the current collector in the electrode assembly 2 coated with an active material layer constitutes the active material coating portion 22, and the portion without an active material layer constitutes the tab portion 211. The tab portion 211 includes multiple layers of tab sheets.

[0136] The adapter 32 surrounds the electrode body 31, so that the adapter 32 can surround the electrode body 31 along the extension direction of the cross-sectional outline of the electrode body 31, thereby exposing at least a portion of the inner end face of the electrode body 31, i.e., the surface of the electrode body 31 facing the electrode assembly 2, for connection with the electrode assembly 2. The cross-section of the electrode body 31 refers to the cross-section obtained by cutting the electrode body 31 with a plane perpendicular to the central axis L of the electrode body 31. The axial direction of the electrode body 31 is the axial direction of the aforementioned central axis L, the axial direction of the adapter 32 is the axial direction of the electrode body 31, the axial direction of the adapter 32 is the direction around the aforementioned central axis L, and the radial direction of the adapter 32 is the direction passing through the aforementioned central axis L in a radial plane, and the radial plane is perpendicular to the central axis L. For example, when the cross-section of the pole body 31 is circular, the pole body 31 is a circular pole body 31, and the outline of the cross-section of the pole body 31 is circular; as another example, when the cross-section of the pole body 31 is racetrack-shaped, the pole body 31 is a racetrack-shaped pole body 31, and the outline of the cross-section of the pole body 31 is racetrack-shaped. Of course, the cross-section of the pole body 31 is not limited to circular or racetrack-shaped; the cross-section of the pole body 31 can also be other shapes, such as rectangular, elliptical, etc.

[0137] Furthermore, the adapter 32 is insulated from the electrode body 31, meaning the electrode body 31 and the adapter 32 are connected, and the electrode body 31 and the adapter 32 are separated by insulating materials, such as, but not limited to, the seal 34 described later. The electrode body 31 and the adapter 32 are not electrically conductive. The outer periphery of the adapter 32 is welded to the first housing wall 11 to allow the electrode assembly 3 to be mounted on the first housing wall 11. For example, the first housing wall 11 has mounting holes 110 formed therein, and the outer periphery of the adapter 32 is welded to the edge of the mounting holes 110 to form a weld at the welding position between the adapter 32 and the first housing wall 11. It can be understood that, viewed along the extension direction of the central axis L of the electrode body 31, the weld between the adapter 32 and the first housing wall 11 encircles the entire circumference of the electrode assembly 3.

[0138] The welding process between the adapter 32 and the first shell wall 11 is not limited, and may include, but is not limited to, laser welding, ultrasonic welding, a combination of ultrasonic pre-welding and laser welding, resistance welding, pressure fusion welding, brazing, etc. In addition, the mating method between the adapter 32 and the first shell wall 11 is not limited, and may include, but is not limited to, butt joint mating, lap joint mating, T-type lap joint mating, guide surface lap joint mating, etc.

[0139] At least one identification portion 321 is formed on the surface of the adapter 32 facing away from the receiving cavity 10. The identification portion 321 is configured to be visually detectable and recognizable by a visual inspection device. The visual inspection system can capture image information of the adapter 32 and detect the position of the identification portion 321. In the radial direction of the adapter 32, the identification portion 321 is spaced between the outer periphery of the pole post body 31 and the outer periphery of the adapter 32, so that the pole post body 31 does not cover the identification portion 321, so that the identification portion 321 is exposed outside the pole post body 31, so that the pole post assembly 3 can be installed on the first During the process of the shell wall 11, the identification part 321 is always exposed outside the pole body 31 so that it can be identified by the vision inspection system. Thus, the position of the outer periphery of the adapter 32 can be obtained according to the position of the identification part 321, and then the position to be welded between the adapter 32 and the first shell wall 11 can be obtained. This allows the welding device, such as a laser welding device, to be aligned with the area between the outer periphery of the adapter 32 and the first shell wall 11 or the calibration offset position of that area for welding. Since the shape of the junction area is around the entire circumference of the adapter 32, the laser welding head is guided to move circumferentially along the junction area to form a full circumference weld.

[0140] Wherein, the surface roughness of the recognition part 321 is less than the surface roughness of the rest of the surface of the adapter 32 on the side facing away from the receiving cavity 10, excluding the recognition part 321, and the surface roughness of the rest of the surface of the adapter 32 on the side facing away from the receiving cavity 10, excluding the recognition part 321, is less than the surface roughness of the outer peripheral wall of the adapter 32, then during the welding process between the adapter 32 and the first shell wall 11, the vision inspection system can capture image information of the adapter 32, and since the surface roughness of the recognition part 321 is less than the surface roughness of the rest of the surface of the adapter 32 on the side facing away from the receiving cavity 10, excluding the recognition part 321, then... Under the same lighting conditions, the recognition unit 321 provides a clearer recognition point for the image acquisition of the vision inspection system, so that the vision inspection system can accurately distinguish the recognition unit 321 from the rest of the surface of the adapter 32 facing away from the receiving cavity 10, except for the recognition unit 321. Compared with other positions on the aforementioned surface of the adapter 32, the vision inspection system can more easily capture and recognize the recognition unit 321 to obtain the accurate position of the recognition unit 321. The position of the outer periphery of the adapter 32 can be obtained based on the accurate position of the recognition unit 321, thereby facilitating more accurate alignment of the welding between the adapter 32 and the first shell wall 11.

[0141] Compared to some technologies where visual inspection systems directly capture the position of the outer peripheral wall of the adapter to obtain the boundary area, the outer peripheral wall of the adapter has a relatively large surface roughness due to limitations in its manufacturing process and cost. This means that when light shines on the outer peripheral wall or edge of the adapter, the microscopic undulations of the surface cause the normal direction to differ at different locations, resulting in different directions of reflected light. The light reflected from the outer peripheral wall is no longer concentrated in a specific direction but is scattered in all directions. In this situation, although for each ray, the microscopic scale still follows the rule that the angle of incidence equals the angle of reflection, the macroscopic... The randomness of the surface normal direction means that, from a macroscopic perspective, the angular distribution of reflected light is random and scattered, making it difficult to form a clear reflection image. This increases the difficulty for visual inspection devices to accurately identify the image. For example, the visual inspection device usually identifies the outer periphery of the adapter 32 as a black line with a width of 400μm-500μm. The weld seam of laser welding is usually 800μm, which is not clearly captured by the visual inspection device. During laser welding, the laser position deviates significantly from the ideal position. The polarization of light during welding causes welding defects such as shrinkage cavities and cracks, which reduce the sealing and connection strength between the housing assembly 1 and the pole assembly 3. It may even lead to welding failure and affect the reliability of the battery cell 102.

[0142] In the above-described configuration of this application, since the surface roughness of the identification unit 321 is relatively smaller than that of the outer peripheral wall of the adapter 32, the light reflected from the identification unit 321 to the visual inspection system is more concentrated, so as to form a clearer reflected image for accurate identification by the visual inspection system. Therefore, the position of the outer peripheral wall of the adapter 32 obtained based on the position of the identification unit 321 can also be more accurate, thereby improving the accuracy of obtaining the position of the outer peripheral wall of the adapter 32 and improving the accuracy of the welding trajectory between the adapter 32 and the first shell wall 11. During the welding process between the adapter 32 and the first shell wall 11, it is easier to guide the welding device to more accurately align the adapter 32 and the first shell wall 11 for welding, improving the welding defects such as shrinkage cavities and cracks caused by misalignment during welding, improving the welding reliability between the shell assembly 1 and the adapter 32, thereby improving the sealing and connection strength between the shell assembly 1 and the terminal assembly 3, and improving the reliability of the battery cell 102.

[0143] In some embodiments of this application, the surface roughness Ra of the identification part 321 is less than or equal to 6.3 μm, which facilitates both accurate identification and ease of processing of the identification part 321. For example, the surface roughness Ra of the identification part 321 is 6.3 μm, 6.2 μm, 6.1 μm, 6 μm, 5.9 μm, 5.8 μm, 5.5 μm, 5.3 μm, 5 μm, etc.

[0144] Please refer to Figures 4-6 In some embodiments, the identification portion 321 is formed as a straight line segment or a curved segment, and the identification portion 321 is parallel to the corresponding portion of the outer periphery of the adapter 32. It can be understood that the outer periphery of the adapter 32 is formed as a closed ring, and a portion of the outer periphery of the adapter 32 is arranged opposite to the identification portion 321 in the radial direction of the adapter 32. The aforementioned portion of the outer periphery of the adapter 32 is parallel to and spaced apart from the identification portion 321. For example, the distance between the identification portion 321 and the aforementioned portion of the outer periphery of the adapter 32 remains substantially constant or fluctuates within a small range along the extension direction of the identification portion 321.

[0145] In the above technical solution, by setting the identification part 321 into a straight line segment or a curved segment, the extension length of the identification part 321 is small, which simplifies the structure of the identification part 321, reduces the processing difficulty of the identification part 321, and allows the identification part 321 to have good flexibility in its setting position. This is especially true when the length of the adapter 32 is greater than the width of the adapter 32, for example, when the outer periphery of the adapter 32 is formed into an oblong, rectangular, or elliptical shape, etc., and the length direction of the adapter 32 is consistent with the length direction of the pole body 31, and the radial distance between the outer periphery of the adapter 32 and the outer periphery of the pole body 31 in the length direction of the adapter 32 is greater than the radial distance between the outer periphery of the adapter 32 and the outer periphery of the pole body 31 in the width direction of the adapter 32, then the adapter 32 The length of the pole body 31 provides ample space for the identification part 321, facilitating its placement without increasing the outer periphery of the adapter 32. By aligning the identification part 321 with the corresponding portion of the adapter 32's outer periphery, and since the position of the adapter 32's outer periphery is based on the position of the identification part 321, this arrangement simplifies the calculation and analysis process of obtaining the position of the adapter 32's outer periphery from the position of the identification part 321. After obtaining the accurate position of the identification part 321, the position of the adapter 32's outer periphery can be obtained by moving a certain distance outward along the radial direction of the adapter 32. This also allows for obtaining the shape of the portion of the adapter 32's outer periphery that is radially opposite to the identification part 321, facilitating faster acquisition of the welding trajectory.

[0146] Please refer to Figure 6 and Figure 8 In some embodiments, the distance W1 between the identification part 321 and the outer periphery of the adapter 32 in the radial direction is not less than 2 mm, that is, W1 ≥ 2 mm. For example, W1 is 2 mm, 2.2 mm, 2.5 mm, 2.7 mm, 3 mm, 3.3 mm, etc.

[0147] It can be understood that when the corresponding portion of the outer periphery of the identification part 321 and the adapter 32 is parallel, the radial distance W1 between the identification part 321 and the outer periphery of the adapter 32 is a constant value or fluctuates within a small range; when the corresponding portion of the outer periphery of the identification part 321 and the adapter 32 is not parallel, the radial distance W1 between the identification part 321 and the outer periphery of the adapter 32 is the minimum radial distance between the identification part 321 and the outer periphery of the adapter 32. For example, the outer periphery of the adapter 32 is formed into a long strip structure, and the two ends of the adapter 32 in the length direction are respectively provided with identification parts 321. The identification parts 321 are provided with the short side 32d of the outer periphery of the adapter 32. The short side 32d can extend along a straight line or a curve. In the radial direction of the adapter 32, the distance W1 between the short side 32d and the corresponding identification part 321 is not less than 2mm, and the distance W1 between the long side 32c of the outer periphery of the adapter 32 and the identification part 321 is not less than 2mm. It can be understood that the "distance between the short side 32d and the corresponding identification part 321" and the "distance between the long side 32c and the identification part 321" can be equal or unequal. For example, the "distance between the long side 32c and the identification part 321" is greater than the "distance between the short side 32d and the corresponding identification part 321".

[0148] In the above technical solution, by setting the radial distance W1 between the identification part 321 and the outer periphery of the adapter 32 to be not less than 2mm, it is easy to make the identification part 321 and the outer periphery of the adapter 32 have a suitable radial distance, which makes it easier to provide sufficient operating space for welding, reduce the risk of interference between the weld between the adapter 32 and the first shell wall 11 and the identification part 321, reduce the risk of interference between the vision inspection system and the welding device during operation, and thus improve the production convenience of the battery cell 102.

[0149] Please refer to Figure 6 and Figure 8 In some embodiments, the width W2 of the identification portion 321 in the radial direction of the adapter 32 is not less than 0.5 mm, that is, W2 ≥ 0.5 mm. For example, W2 is 0.5 mm, 0.6 mm, 0.7 mm, 0.9 mm, 1 mm, 1.2 mm, 1.5 mm, 2 mm, 3 mm, 3.3 mm, etc.

[0150] In the above technical solution, by setting the width W2 of the identification part 321 to be no less than 0.5mm, it is convenient to simultaneously take into account the processing convenience and recognizability of the identification part 321. In other words, if the width of the identification part 321 is too small, the identification difficulty will increase, and the processing requirements will also be higher. If the width of the identification part 321 is too large, it is easy to increase the radial dimension of the adapter 32. Increasing the radial dimension of the pole assembly 3 is not conducive to improving the energy density of the battery cell 102.

[0151] Please refer to Figure 8 , Figures 10-13 In some embodiments, the height H of the identification portion 321 along the axial direction of the adapter 32 is not less than 0.1 mm and does not exceed 1 mm, i.e., 0.1 mm ≤ H ≤ 1 mm. It can be understood that when the identification portion 321 is a groove, the height of the identification portion 321 is the depth of the groove; when the identification portion 321 is a protrusion 331, the height of the identification portion 321 is the protrusion height of the protrusion 331. For example, H can be 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm, 0.6 mm, 0.9 mm, or 1 mm, etc.

[0152] In the above technical solution, by setting the height H of the identification part 321 to be not less than 0.1mm, it is convenient to simultaneously consider the processing convenience and recognizability of the identification part 321, and to meet the mechanical process requirements. In other words, if the height of the identification part 321 is too small, the identification difficulty will increase, and the processing requirements will also be higher. If the height of the identification part 321 is too large, it is easy to increase the weakening degree of the adapter 32 / it is easy to increase the axial dimension of the adapter 32, which is not conducive to improving the energy density of the battery cell 102.

[0153] Please refer to Figure 8 , Figures 10-13 In some embodiments, the pole assembly 3 further includes a first insulating member 33, which is disposed on the adapter 32 and located on the side of the adapter 32 facing the receiving cavity 10. The side of the adapter 32 facing the receiving cavity 10 has a plurality of mating holes 322, and the first insulating member 33 has a plurality of protrusions 331, which are fixed to the corresponding mating holes 322. In the direction perpendicular to the axial direction of the adapter 32, the distance W3 between the identification part 321 and the mating hole 322 is not less than 1 mm, that is, W3 ≥ 1 mm.

[0154] The phrase "the first insulating component 33 is disposed on the adapter 32" means that the first insulating component 33 is supported by the adapter 32, but the connection method between the two is not limited. For example, the first insulating component 33 and the adapter 32 can be processed into a non-detachable integral structure, such as the first insulating component 33 being injection molded onto the adapter 32; or the first insulating component 33 and the adapter 32 can be processed into two separate structures and assembled and connected, such as the first insulating component 33 being injection molded separately and snapped or riveted to the adapter 32. This can simplify the processing technology, reduce processing costs, and ensure that both have good structural strength.

[0155] In the above technical solution, by setting the first insulating member 33, it can, to a certain extent, block the connection between the adapter 32 and the electrode assembly 2, thereby reducing the risk of short circuit between the electrode assembly 2 and the adapter 32. Simultaneously, the protrusion 331 of the first insulating member 33 is fitted with a mating hole 322 on the adapter 32, facilitating the positioning of the first insulating member 33 and the adapter 32, and simplifying their assembly and subsequent fixation. Furthermore, by setting the distance W3 between the identification part 321 and the mating hole 322 to be no less than 1mm, it facilitates the connection between the identification part 321 and the mating hole 322. The mating hole 322 has a suitable radial spacing to improve the problem of the adapter 32 being significantly weakened due to the high concentration of the identification part 321 and the mating hole 322 when the identification part 321 is a groove formed on the adapter 32. This facilitates the improvement of the structural reliability of the adapter 32. At the same time, since the first insulating member 33 and the adapter 32 are fixedly connected at the mating hole 322, the above-mentioned spacing helps to reduce the impact of the connection at the mating hole 322 on the identification part 321, which helps to improve the structural and dimensional stability of the identification part 321, thereby improving the identification accuracy.

[0156] Please refer to Figure 8 , Figures 10-13 In some embodiments, the protrusion 331 is hot-riveted to the corresponding mating hole 322. The protrusion 331 can be understood as a rivet. When the first insulating member 33 and the adapter 32 are assembled, the protrusion 331 is mated to the corresponding mating hole 322. The protrusion 331 is softened by heating and deformed by external force to form a connection with the hole wall of the corresponding mating hole 322.

[0157] In the above technical solution, the protrusion 331 is set to be hot-riveted and fixed to the corresponding mating hole 322, which facilitates the reliable connection between the first insulating part 33 and the adapter 32, so that the connection position of the two can withstand a large force. Moreover, the process is simple and can be adapted to the connection of various materials without causing too many restrictions on the material selection of the first insulating part 33 and the adapter 32.

[0158] For example, there can be multiple mating holes 322, and these multiple mating holes 322 can be spaced apart along the axial direction of the adapter 32. For example, in Figure 7 In the example, there are two mating holes 322, which are arranged opposite each other along the opposite direction of the adapter 32. Of course, the connection between the first insulating member 33 and the adapter 32 is not limited to the mating of the protrusion 331 and the mating hole 322.

[0159] Please refer to Figure 8In some embodiments, the adapter 32 includes a first adapter portion 324 and a second adapter portion 325. The first adapter portion 324 is clamped on the side of the pole body 31 facing away from the receiving cavity 10, and the second adapter portion 325 is clamped on the side of the pole body 31 facing the receiving cavity 10. The outer edge of the first adapter portion 324 is welded to the second adapter portion 325. In the radial direction of the adapter 32, the weld seam of the first adapter portion 324 and the second adapter portion 325 is located inside the mating hole 322. Therefore, in the radial direction of the adapter 32, the radial distance between the weld seam of the first adapter portion 324 and the second adapter portion 325 and the identification portion 321 is greater than 1 mm.

[0160] In the above technical solution, by setting the weld seams of the first adapter portion 324 and the second adapter portion 325 to be located radially inside the mating hole 322, the weld seams of the first adapter portion 324 and the second adapter portion 325 and the identification portion 321 have a suitable radial distance. This helps to reduce the impact of the welding between the first adapter portion 324 and the second adapter portion 325 on the identification portion 321, and helps to improve the structural and dimensional stability of the identification portion 321, thereby achieving accurate positioning of the identification portion 321.

[0161] Please refer to Figure 8 In some embodiments, the adapter 32 includes a first adapter portion 324 and a second adapter portion 325. The first adapter portion 324 is clamped on the side of the pole body 31 facing away from the receiving cavity 10, and the second adapter portion 325 is clamped on the side of the pole body 31 facing the receiving cavity 10. The outer edge of the first adapter portion 324 is welded to the second adapter portion 325. In the radial direction of the adapter 32, the weld seam of the first adapter portion 324 and the second adapter portion 325 is located inside the identification portion 321, and the radial distance W4 between the weld seam of the first adapter portion 324 and the second adapter portion 325 and the identification portion 321 is not less than 1 mm, that is, W4 ≥ 1 mm.

[0162] In the above technical solution, by setting the radial distance W4 between the weld seam of the first adapter portion 324 and the second adapter portion 325 and the identification portion 321 to be not less than 1mm, the weld seam of the first adapter portion 324 and the second adapter portion 325 and the identification portion 321 have a suitable distance in the radial direction. This helps to reduce the impact of the welding between the first adapter portion 324 and the second adapter portion 325 on the identification portion 321, and helps to improve the structural and dimensional stability of the identification portion 321, so as to achieve accurate grasping of the position of the identification portion 321.

[0163] In some embodiments, please refer to Figure 8 , Figures 10-12 The identification part 321 is formed as a recess in the adapter 32, or, please refer to Figure 13The identification part 321 is formed as a protrusion 331 protruding from the adapter 32.

[0164] It can be understood that when the identification part 321 is a groove, the surface roughness of the identification part 321 can be understood as the surface roughness of the groove wall; when the identification part 321 is a protrusion 331, the surface roughness of the identification part 321 can be understood as the surface roughness of the outer surface of the protrusion 331.

[0165] In the above technical solution, by setting the identification part 321 into a groove or protrusion 331, the identification part 321 has a simple structure and is easy to process. It will not overly complicate the structure of the battery cell 102, nor will it overly increase the processing difficulty and processing cost of the battery cell 102.

[0166] Please refer to Figure 8 , Figures 10-13 In some embodiments, the identification portion 321 is formed in a square, semi-circular, racetrack-shaped, elliptical, triangular, or chamfered rectangle in the longitudinal section of the adapter 32. The longitudinal section of the adapter 32 passes through the central axis L. A chamfered rectangle can be understood as a rectangle with rounded corners. The corners of the rectangle are rounded, for example, when the identification portion 321 is a groove, the sidewall and bottom wall of the groove are rounded; when the identification portion 321 is a protrusion 331, the surface of the protrusion 331 facing away from the electrode assembly 2 is rounded.

[0167] For example, in Figure 8 In the example, the identification part 321 is formed as a square groove; in Figure 10 In the example, the recognition part 321 is formed as a chamfered rectangular groove; in Figure 11 In the example, the recognition part 321 is formed as a triangular groove; in Figure 12 In the example, the identification part 321 is formed as a semi-circular groove; in Figure 13 In the example, the recognition part 321 is formed as a triangular protrusion.

[0168] In the above technical solution, by setting the recognition part 321 to be square, semi-circular, racetrack-shaped, elliptical, triangular, or chamfered rectangle, it is easy to flexibly set the shape of the recognition part 321, which is beneficial to adapting to the differentiated needs of different scenarios. It can be understood that in the longitudinal section of the adapter 32, for the solutions where the recognition part 321 is formed as semi-circular, racetrack-shaped, elliptical, or chamfered rectangle, the adjacent two surfaces of the recognition part 321 can be smoothly transitioned, which helps to improve the stress concentration problem at the recognition part 321.

[0169] Please refer to Figure 8 , Figures 10-13In some embodiments, the identification portion 321 is integrally extruded onto the adapter 32. In this embodiment, the identification portion 321 can be a groove or a protrusion 331. For example, the adapter 32 is placed in a mold cavity, and strong pressure is applied to plastically deform the corresponding position on the adapter 32 to form the identification portion 321.

[0170] In the above technical solution, by integrally extruding the identification part 321 onto the adapter 32, it is beneficial to improve the processing efficiency and processing accuracy of the identification part 321, and at the same time, it is easy to improve the surface roughness of the identification part 321, so that the surface roughness of the identification part 321 is less than the surface roughness of other parts of the adapter 32.

[0171] Of course, in other embodiments, the identification unit 321 may also be installed on the adapter 32 by assembly means.

[0172] Please refer to Figure 4 , Figures 14-16 In some embodiments, there are multiple identification portions 321, and the multiple identification portions 321 are arranged at intervals along the circumference of the adapter 32. For example, the identification portions 321 are formed as straight line segments or curved segments.

[0173] In the above technical solution, by setting multiple identification units 321 at intervals along the circumference of the adapter 32, a complete welding trajectory can be obtained more accurately through the multiple identification units 321, thereby improving the accuracy of the entire welding trajectory and further improving the welding reliability between the adapter 32 and the first shell wall 11.

[0174] Please refer to Figure 14 In some embodiments, the outer periphery of the adapter 32 is formed into a circular structure, for example, the adapter 32 is generally cylindrical, and two of the plurality of identification portions 321 are radially opposite to each other along the adapter 32, for example, two of the plurality of identification portions 321 are located on the same straight line passing through the central axis L along the adapter 32. It can be understood that in the above arrangement, there can be two identification portions 321, which are radially opposite to each other along the adapter 32; or there can be three or more identification portions 321, where two identification portions 321 are radially opposite to each other along the adapter 32.

[0175] In the above technical solution, when the outer periphery of the adapter 32 is formed into a circular structure, two of the multiple identification parts 321 are radially opposite to each other along the adapter 32, which makes it easier for the two identification parts 321 to be distributed more dispersedly. This is to improve the accuracy of obtaining the position of the entire outer periphery of the adapter 32 through multiple identification parts 321, which is beneficial to improving the accuracy of obtaining the entire welding trajectory.

[0176] In some embodiments, the adapter 32 engages with the first housing wall 11 via a positioning structure to restrict the rotation of the adapter 32 about its central axis relative to the housing assembly 1.

[0177] In the above technical solution, by setting the adapter 32 and the first shell wall 11 to cooperate through a positioning structure, the rotation of the adapter 32 relative to the shell assembly 1 is restricted by the positioning structure, that is, the rotation of the adapter 32 relative to the first shell wall 11 is restricted, which facilitates the positioning of the adapter 32 and the first shell wall 11. At the same time, the setting of the positioning structure can make each of the multiple recognition parts 321 have a specific position, which corresponds to the information of the relative position between the recognition part 321 and the outer periphery of the adapter 32 built into the vision detection system, so that the position of the outer periphery of the adapter 32 can be accurately obtained after the position of the recognition part 321 is obtained.

[0178] Please refer to Figure 4 , Figure 5 , Figures 15-16 In some embodiments, the outer periphery of the adapter 32 is formed into a long strip structure, and the two ends of the adapter 32 in the length direction are respectively provided with identification parts 321, which are spaced apart from the two ends of the adapter 32 in the length direction.

[0179] In the above technical solution, the outer periphery of the adapter 32 is formed into a long strip structure, and the two ends of the adapter 32 in the length direction are respectively equipped with identification parts 321. Since the length of the adapter 32 is greater than the width of the adapter 32, the error between the two ends of the adapter 32 in the length direction and the corresponding position of the first shell wall 11 is relatively larger than the error in the width direction. Therefore, the two ends of the adapter 32 in the length direction are more prone to light polarization and welding defects. By setting the identification parts 321 on the corresponding length direction edge, the accuracy of obtaining the position of the two ends of the adapter 32 in the length direction can be improved, thereby facilitating the improvement of the overall welding strength.

[0180] It is understandable that when the outer periphery of the adapter 32 is formed into a long strip structure, the length of the adapter 32 is greater than the width of the adapter 32. At this time, the outer periphery of the electrode body 31 can also be formed into a long strip structure. The length direction of the adapter 32 is consistent with the length direction of the electrode body 31, and the width direction of the adapter 32 is consistent with the width direction of the electrode body 31. At this time, the two ends of the adapter 32 in the width direction do not need to be provided with corresponding identification parts 321, which is beneficial to reduce the width of the adapter 32, reduce the width of the electrode body 31, and reduce the thickness of the battery cell 102.

[0181] In some embodiments, such as Figure 4 , Figure 5As shown, the outer periphery of the adapter 32 is formed into an elongated oval shape, and the outer periphery of the adapter 32 includes two oppositely arranged straight edges 32a and two oppositely arranged arcuate edges 32b, each arcuate edge 32b corresponding to a recognition portion 321 parallel to it; or, as shown Figure 15 As shown, the outer periphery of the adapter 32 is elliptical, and the outer periphery of the adapter 32 includes two opposing first long sides 32e and two opposing first short sides 32f, each first short side 32f corresponding to a recognition portion 321 parallel to it; or, as shown Figure 16 As shown, the outer periphery of the adapter 32 is rectangular, and the outer periphery of the adapter 32 includes two oppositely arranged second long sides 32g and two oppositely arranged second short sides 32h, each of which has a corresponding identification part 321 parallel to it.

[0182] In the above technical solution, the two ends of the adapter 32 are respectively identified by the identification part 321 along the length direction of the adapter 32, which can be applied to adapters 32 with different structural forms, and the structural setting is flexible.

[0183] Please refer to Figure 6 In some embodiments, the outer periphery of the adapter 32 includes two oppositely arranged long sides 32c and two oppositely arranged short sides 32d. The short sides 32d extend in an arc shape. The identification part 321 is arranged parallel to the short sides 32d, so the identification part 321 also extends in an arc shape (e.g., a circular arc or an elliptical arc). The central angle α of the identification part 321 is not less than 30° and does not exceed 90°, that is, 30°≤α≤90°. For example, α can be 30°, 35°, 40°, 45°, 48°, 53°, 55°, 60°, 62°, 70°, 78°, 80°, 85°, or 90°, etc.

[0184] In the above technical solution, by setting the identification part 321 parallel to the short side 32d, since the position of the outer periphery of the adapter 32 is obtained based on the position of the identification part 321, the above arrangement simplifies the calculation and analysis process of obtaining the position of the short side 32d of the adapter 32 from the position of the identification part 321. After obtaining the accurate position of the identification part 321, the position of the short side 32d of the adapter 32 can be obtained by moving a certain distance outward along the radial direction of the adapter 32. At the same time, the shape of the short side 32d of the adapter 32 can also be obtained, which facilitates faster acquisition of the welding rail. The central angle α of the recognition unit 321 is set to be no less than 30° and no more than 90°. This is to ensure that the recognition unit 321 is parallel to the short side 32d, as well as the recognizability and ease of processing of the recognition unit 321. It can be understood that if α is too large, the extension length of the recognition unit 321 will be too long, the processing difficulty of the recognition unit 321 being parallel to the short side 32d will be relatively high, and the concentricity of the recognition unit 321 and the short side 32d will be relatively difficult to control. If α is too small, the extension length of the recognition unit 321 will be too short, which will increase the recognition difficulty and limit the capture accuracy.

[0185] For example, when the outer periphery of the adapter 32 is formed as an elongated circle, the short side of the adapter 32 is an arc-shaped side 32b, and the center of the circle corresponding to the central angle α of the identification part 321 and the center of the arc-shaped side 32b are located on the same straight line parallel to the central axis L; when the outer periphery of the adapter 32 is formed as an ellipse, the center of the circle corresponding to the central angle α of the identification part 321 and one of the focal points of the ellipse are located on the same straight line parallel to the central axis L.

[0186] Please refer to Figure 9 In some embodiments, the housing assembly 1 includes a housing body 12 and a housing cover 13. One end of the housing body 12 in the axial direction of the adapter 32 is an open end, and the housing cover 13 is disposed on the open end, forming a first housing wall 11. Thus, the housing cover 13 supports the terminal assembly 3, facilitating the flexible production and processing of the battery cell 102. For example, during the production process of the battery cell 102, such as... Figure 18 and Figure 19 As shown, the tabs of the electrode assembly 2 can be pre-welded (e.g., ultrasonically pre-welded) into a plate-like tab portion 211. Then, the electrode assembly 2 is installed onto the housing cover 13, so that the tab portion 211 passes through the mounting hole 110 from the inside to the outside. After that, the housing body 12 is fitted onto the electrode assembly 2, and the housing body 12 is welded to the housing cover 13. Then, the electrode post assembly 3 is placed outside the housing cover 13 and welded to the tab portion 211. After that, the electrode post assembly 3 is rotated 90° and placed on the housing cover 13. The adapter 32 is then welded to the housing cover 13, and a sealing test is performed. However, this application is not limited to this. For example, in other embodiments of this application, the adapter 32 can be welded to the housing cover 13 first, and then the housing body 12 can be fitted onto the electrode assembly 2, and then the housing body 12 can be welded to the housing cover 13.

[0187] In some embodiments, such as Figure 8 , Figures 10-13 As shown, the edge of the adapter 32 has a connecting portion 323, and the end of the connecting portion 323 near the housing cover 13 has an overlapping portion 3231. The end of the housing cover 13 near the pole post assembly 3 has a stepped portion 132. The overlapping portion 3231 overlaps the side of the stepped portion 132 away from the receiving cavity 10, and the overlapping portion 3231 is welded to the stepped portion 132. It can be understood that the outer peripheral wall of the adapter 32 is the outer peripheral wall of the connecting portion 323, and the outer peripheral wall of the connecting portion 323 includes the outer peripheral wall of the overlapping portion 3231; both the overlapping portion 3231 and the stepped portion 132 are formed in annular shape.

[0188] Therefore, by setting the overlapping part 3231 to overlap the side of the step part 132 away from the receiving cavity 10, it can be explained that the overlapping part 3231 overlaps the outer side of the step part 132, so that the pole post assembly 3 can be covered on the housing cover 13 in the direction from the outer side to the inner side, thereby facilitating the assembly of the pole post assembly 3 to the housing cover 13. Moreover, through the overlapping cooperation between the overlapping part 3231 and the step part 132, the pole post assembly 3 and the housing cover 13 can be reliably positioned. During the welding process, the cooperation between the adapter 32 and the housing cover 13 is more stable, thereby improving the welding quality of the adapter 32 and the housing cover 13.

[0189] For example, the adapter 32 is welded to the housing cover 13 at least through the overlap portion 3231, and the weld mark formed by the adapter 32 and the housing cover 13 extends along the direction from the overlap portion 3231 to the step portion 132. That is, welding can be performed along the direction from the outside of the housing assembly 1 to the inside of the housing assembly 1, thereby facilitating the welding operation.

[0190] Please refer to Figure 8 In some embodiments, the pole assembly 3 further includes a first insulating member 33, which is disposed on the adapter 32 and located on the side of the adapter 32 facing the receiving cavity 10. In the radial direction of the adapter 32, the connecting portion 323 is located radially outside the first insulating member 33. In other words, the connecting portion 323 extends beyond the coverage of the first insulating member 33 in the direction away from the pole body 31.

[0191] In the above technical solution, since the connecting part 323 is located on the radial outer side of the first insulating part 33, the radial dimension of the first insulating part 33 is relatively small, and it is in a recessed form relative to the adapter 32. Therefore, when the pole post assembly 3 is covered with the shell cover 13 from the outer side to the inner side to achieve overlapping fit, the recessed first insulating part 33 will not cause assembly interference, which is conducive to the smooth assembly of the pole post assembly 3.

[0192] Please refer to Figure 8 and Figure 9In some embodiments, the battery cell 102 further includes an insulating support 4, which is disposed on the cover 13 and located within the receiving cavity 10. The insulating support 4 includes a first portion 41, which is located between the first insulating member 33 and the housing 12 in the radial direction of the adapter 32. For example, the electrode assembly 2 includes an active material coating portion 22 and a conductive portion 21. The insulating support 4 can be disposed on the side of the active material coating portion 21 facing the first housing wall 11, so as to support the electrode assembly 2 by means of the insulating support 4, thereby separating the active material coating portion 21 from the first housing wall 11, reducing the probability of the active material coating portion 21 contacting the first housing wall 11, thereby reducing the risk of corrosion of the first housing wall 11 due to exposure of the active material coating portion 21, reducing the risk of leakage, and improving the reliability and stability of the battery cell 102.

[0193] The phrase "insulating bracket 4 is provided on the shell cover 13" means that the insulating bracket 4 is supported by the shell cover 13, but the connection method between the two is not limited. For example, it can be processed into an integral structure that is not detachable with the shell cover 13, such as the first insulating component 33 being injection molded onto the shell cover 13; or it can be processed into two separate structures with the shell cover 13 and assembled and connected, such as by snap-fit.

[0194] Therefore, the overall size of the pole assembly 3 is relatively smaller than that of the housing cover 13, which helps to shorten the length of the pole tab 211, reduce the space occupied by the pole tab 211 in the receiving cavity 10, and reduce problems such as damage and inversion caused by the redundancy of the pole tab 211. Moreover, by installing the insulating bracket 4 on the housing cover 13, it is convenient to install the insulating bracket 4. For example, the insulating bracket 4 can be fixed on the housing cover 13 first, and then the housing cover 13 and the housing body 12 can be assembled together.

[0195] In some embodiments, the electrode assembly 2 is covered with an insulating film 5. When there are multiple electrode assemblies 2, the insulating film 5 can simultaneously cover the active material coating portions 22 of multiple electrode assemblies 2. The insulating support 4 includes a second portion 42 extending from the first portion 41 toward the active material coating portion 22, and the end of the insulating film 5 near the electrode post assembly 3 is connected to the second portion 42. For example, the insulating support 4 and the insulating film 5 can be bonded, welded, etc. Thus, the insulating support 4 and the insulating film 5 are both insulating materials and can also be used to connect the insulating film 5, thereby simplifying the overall structure of the battery cell 102. Moreover, the connection method of the insulating film 5 and the insulating support 4 described above facilitates the rapid assembly of the battery cell 102 and improves production efficiency.

[0196] For example, during the production process of the battery cell 1022, the insulating support 4 can be installed on the shell cover 13 to obtain the shell cover assembly. Then, the electrode tabs of the electrode assembly 2 are pre-welded into the tab portion 211 in the form of a plate. The electrode assembly 2 is installed onto the shell cover 13 so that the tab portion 211 passes through the through hole 420. Then, the insulating film 5 is wrapped around the active material coating portion 22 of the electrode assembly 2, and the end of the insulating film 5 is connected to the insulating support 4. After that, the shell body 12 is fitted onto the electrode assembly 2, and the shell body 12 is welded to the shell cover 13. Then, the terminal post assembly 3 is placed outside the shell cover 13 and welded to the tab portion 211. After that, the terminal post assembly 3 is rotated 90° and placed on the shell cover 13. The adapter 32 is welded to the shell cover 13. After that, a sealing test is performed.

[0197] In some embodiments, such as Figure 9 and Figure 17 As shown, the insulating support 4 includes a second portion 42 extending from the first portion 41 toward the active material coating portion 22. The second portion 42 forms a through hole 420 through which the conductive portion 21 passes. The second portion 42 includes a support portion 421 that supports the portion of the conductive portion 21 passing through the through hole 420 toward the active material coating portion 22. It can be seen that, to a certain extent, the support portion 421 can separate the conductive portion 21 from the active material coating portion 22, and the support portion 421 can prevent the conductive portion 21 from moving toward the active material coating portion 22. For example, when the conductive portion 21 is subjected to an external force that causes it to tend to move toward the active material coating portion 22, the support portion 421 can apply a reaction force to the conductive portion 21 to hinder its tendency to move toward the active material coating portion 22. This reduces the risk of the conductive portion 21 moving toward the active material coating portion 22 and causing a short circuit, thus improving the reliability of the battery cell 102.

[0198] Therefore, the support of the support portion 421 on the conductive portion 21 makes it easy for the conductive portion 21 to maintain the preset shape, which is beneficial to make the shape and position of the conductive portion 21 controllable. At the same time, the support portion 421 can also block a part of the conductive portion 21 from the active material coating portion 22, so as to reduce the probability that the conductive portion 21 will be inserted into the active material coating portion 22 due to redundancy, thereby improving the reliability of the battery cell 102.

[0199] In some examples, the conductive portion 21 includes a bent section 212, which forms an opening groove 212a. Exemplarily, the bent section 212 may include a first extension section 2121, a second extension section 2122, and a transition section 2123. The first extension section 2121 and the second extension section 2122 may be disposed opposite to each other along the thickness direction of the first shell wall 11. The transition section 2123 is bent and connected between the first extension section 2121 and the second extension section 2122. One end of the first extension section 2121 away from the transition section 2123 and one end of the second extension section 2122 away from the transition section 2123 are spaced apart to define the opening of the groove 212a.

[0200] like Figure 9 and Figure 17 As shown, the opening of the slot 212a is positioned facing the side where the support part 421 is located. The support part 421 extends into the slot 212a and abuts against the bent section 212. This allows the support part 421 to provide some support and / or pressure on the bent section 212, so that the bent section 212 can maintain a preset bending shape. This helps to control the bending shape of the conductive part 21 and the position of the bent section 212. At the same time, the support part 421 can also block a part of the bent section 212 from the active material coating part 22, so as to reduce the probability that the conductive part 21 will be inserted into the active material coating part 22 due to redundancy, reduce the risk of short circuit in the battery cell 102, and improve the reliability of the battery cell 102. For example, the bending section 212 includes a first extension section 2121, a second extension section 2122 and a transition section 2123. The first extension section 2121 is located on the side of the second extension section 2122 away from the active material coating portion 22. The support portion 421 extends into the opening groove 212a so as to support the first extension section 2121 and / or press against the second extension section 2122.

[0201] In other examples, the opening of the slot 212a is positioned away from the side where the support 421 is located, and the support 421 abuts against the side of the bent section 212 facing the active material coating section 22. In this case, the support 421 can also provide some support for the bent section 212, making it easier for the bent section 212 to maintain the preset bending shape. This allows the bending shape of the conductive part 21 and the position of the bent section 212 to be controlled. At the same time, the support 421 can also block the bent section 212 from the active material coating section 22, reducing the probability of the bent section 212 being inserted into the active material coating section 22 and improving reliability. For example, the bending section 212 includes a first extension section 2121, a second extension section 2122, and a transition section 2123. The first extension section 2121 is located on the side of the second extension section 2122 that is away from the active material coating portion 22. The opening of the groove 212a is disposed away from the support portion 421. The support portion 421 abuts against the side of the second extension section 2122 and / or the transition section 2123 that faces the active material coating portion 22.

[0202] Please refer to Figure 9 and Figure 17 In some embodiments, the second part 42 further includes a pressing part 422 that is opposite to and spaced apart from the support part 421, the conductive part 21 passing through the gap between the support part 421 and the pressing part 422, and the pressing part 422 pressing against the side of the conductive part 21 facing the active material coating part 22.

[0203] As can be seen, by setting the pressing part 422, the conductive part 21 is sandwiched between the supporting part 421 and the pressing part 422. The pressing part 422 and the supporting part 421 cooperate to gather the conductive part 21, which makes it easier to maintain the conductive part 21 in the preset gathered and extended shape, and the conductive part 21 is more tightly gathered, further reducing the probability of the conductive part 21 spreading out. In particular, the conductive part 21 includes a tab 211, which includes multiple stacked tabs. The tab 211 passes between the supporting part 421 and the pressing part 422, which makes it easier to maintain the shape of the tab 211 and reduce the probability of the tab 211 spreading out.

[0204] Please refer to Figure 9 and Figure 17 In some embodiments, the conductive portion 21 includes a bent section 212, the bent section 212 having an opening groove 212a, a support portion 421 corresponding to the pressing portion 422 extending into the opening groove 212a, and the support portion 421 corresponding to the pressing portion 422 abuts against the bent section 212, the pressing portion 422 abutting against the side of the bent section 212 away from the active material coating portion 22.

[0205] In the above technical solution, the pressing part 422 cooperates with the supporting part 421. The supporting part 421 extends into the opening groove 212a, and the pressing part 422 abuts against the side of the bent section 212 away from the active material coating part 22, so that a part of the bent section 212 is restricted between the supporting part 421 and the pressing part 422. The pressing part 422 and the supporting part 421 cooperate to bring the bent section 212 together, so that the bent section 212 can maintain the preset convergence and bending shape, and the bent section 212 is brought together more tightly, further reducing the probability of the bent section 212 spreading out. It can be understood that in the embodiments of this application, the pressing part 422 can extend horizontally, extend obliquely, or extend in a bent manner, so as to match the bent section 212.

[0206] Please refer to Figure 9 and Figure 17 In some embodiments, the electrode assembly 2 includes an active material coating portion 22 disposed within the receiving cavity 10, and a conductive portion 21 connected between the active material coating portion 22 and the electrode body 31. The conductive portion 21 includes an electrode tab portion 211 connected to the active material coating portion 22. The insulating support 4 also includes a second portion 42 extending from the first portion 41 toward the active material coating portion 22 to isolate the electrode assembly 3 from the active material coating portion 22.

[0207] In the above technical solution, by setting the second part 42, it is convenient to reduce the risk of short circuit caused by the part of the conductive part 21 that passes through the second part 42 facing the pole assembly 3 being inserted into the active material coating part 22 while achieving the connection between the conductive part 21 and the pole body 31. This is beneficial to further improve the reliability of the battery cell 102.

[0208] Please refer to Figure 7 , Figure 9 and Figure 17 In some embodiments, the electrode assembly 3 further includes a seal 34, which is sealed between the electrode body 31 and the adapter 32. Therefore, the electrode assembly 3 itself has sealing capabilities, eliminating the need to consider sealing issues when connecting the electrode assembly 3 to the housing assembly 1. This reduces the sealing pressure on the housing assembly 1 during connection with the electrode assembly 3, thus protecting the housing assembly 1. For example, the seal 34 can be a rubber ring, etc.

[0209] In the embodiments of this application, since the "pole post body 31 and adapter 32 are insulatedly connected," it is explained that the pole post body 31 and adapter 32 are separated by an insulating material. The "insulating material" is not limited; for example, it can be solely the sealing element 34, or a combination of the sealing element 34 and the insulating element, or an insulating layer may also be provided. The hardness of the insulating element is greater than that of the sealing element 34, and the sealing function is mainly achieved by the elastic sealing element 34. For example, the insulating element can be an insulating plastic part, which can be injection molded separately or injection molded integrally with the pole post body 31.

[0210] The connection method between the pole body 31 and the adapter 32 is not limited. For example, the pole body 31 can clamp the adapter 32 (e.g., Figure 17 (as shown), or it could be an adapter 32 that holds the pole body 31 (as shown). Figure 9 (As shown).

[0211] In some embodiments, reference Figure 17 The electrode body 31 passes through the adapter 32, and the electrode body 31 includes an inner clamping portion 311 and an outer clamping portion 312. The outer clamping portion 312 is clamped on the outside of the adapter 32, i.e., on the side away from the receiving cavity 10, or on the side away from the inside of the housing assembly 1. The inner clamping portion 311 is clamped on the inside of the adapter 32, i.e., on the side close to the inside of the housing assembly 1. The sealing member 34 is clamped between the inner clamping portion 311 and the adapter 32. The electrode assembly 3 also includes a second insulating member 35, which is clamped between the outer clamping portion 312 and the adapter 32. Thus, by clamping the adapter 32 with the electrode body 31, the sealing member 34 can seal from the side close to the receiving cavity 10, which can more effectively prevent electrolyte leakage from the mating position of the electrode body 31 and the adapter 32, improving reliability.

[0212] The identification part 321 is exposed outside the second insulating member 35. In the radial direction of the adapter 32, the identification part 321 is located on the radial outer side of the second insulating member 35. Of course, the identification part 321 is also exposed on the outer side of the outer clamping part 312.

[0213] It is understood that the pole body 31 can be a single piece or a separate piece. For example, the pole body 31 can clamp the adapter 32 by partial riveting deformation; or, the pole body 31 can clamp the adapter 32 by welding or bonding multiple parts together. This simplifies the design of the adapter 32 and allows for diverse designs of the pole body 31. In this embodiment, the adapter 32 can be a single piece (e.g., Figure 17 (as shown) or separate parts (such as) Figure 9 (As shown).

[0214] In some embodiments, reference Figure 17The adapter 32 defines a through hole 32i. The pole body 31 includes a first pole portion 31a and a second pole portion 31b. The first pole portion 31a is a single piece and includes a through portion 313 and an inner clamping portion 311. The second pole portion 31b is a single piece and includes an outer clamping portion 312. The through portion 313 passes through the through hole 32i. One end of the through portion 313 near the inside of the housing assembly 1 is connected to the inner clamping portion. 311 is connected, and the end of the through part 313 away from the receiving cavity 10, that is, the end away from the inside of the housing assembly 1, is welded to the outer clamping part 312. The sealing member 34 is provided at the through hole 32i and surrounds the through part 313 to clamp between the edge of the adapter 32 near the through hole 32i and the inner clamping part 311. The welding position between the through part 313 and the inner clamping part 311 is relative to the sealing member 34 near the central axis L1 of the through part 313.

[0215] Therefore, by configuring the pole body 31 as described above, and arranging the welding positions between the through portion 313 and the inner clamping portion 311, as well as the relative positions of the sealing element 34, the sealing element 34 can be reliably clamped after the first pole portion 31a and the second pole portion 31b are welded. The rebound force of the sealing element 34 is less likely to cause the welding positions of the first pole portion 31a and the second pole portion 31b to separate or loosen, thus improving the sealing reliability. Furthermore, the welding positions of the first pole portion 31a and the second pole portion 31b are on the outer side, facilitating welding operations and ensuring welding quality.

[0216] According to a second aspect of this application, this application also provides a battery device 100, including a battery cell 102 of any of the above-described embodiments. Therefore, since the reliability of the battery cell 102 according to this application embodiment is improved, it is beneficial to improve the performance of the battery device 100.

[0217] For example, the battery device 100 further includes a busbar, and multiple battery cells 102, at least two of which are electrically connected through the busbar. This allows for the series and / or parallel connection of multiple battery cells 102. For instance, when multiple battery cells 102 are connected in series, the negative terminal assembly 3 of one battery cell 102 is connected to the positive terminal assembly 3 of the next battery cell 102 through a busbar, while the positive terminal assembly 3 of the same battery cell 102 is connected to the negative terminal assembly 3 of the previous battery cell 102 through another busbar.

[0218] For example, combined Figure 2 The battery device 100 includes a housing 101, multiple battery cells 102 housed within the housing 101, and a bottom plate 1013 at the bottom of the housing 101. A terminal post assembly 3 is located on the side of the housing facing the bottom plate 1013, or on the side of the housing away from the bottom plate 1013.

[0219] During the use of the battery device 100, such as in vehicle use, the bottom plate 1013 of the casing is located at the bottom of the casing 101 in the direction of gravity. Thus, when the terminal post assembly 3 is located on the side of the housing assembly 1 facing the bottom plate 1013, it means the terminal post assembly 3 is located at the bottom of the housing assembly 1 in the direction of gravity; conversely, when the terminal post assembly 3 is located on the side of the housing assembly 1 away from the bottom plate 1013, it means the terminal post assembly 3 is located at the top of the housing assembly 1 in the direction of gravity. Therefore, the relative position of the terminal post assembly 3 and the bottom plate 1013 is not limited, allowing for flexible arrangement of the battery cell 102 and the casing 101.

[0220] According to a third aspect of this application, this application also provides an electrical device 1000, including a battery device 100 of any of the above-described embodiments, the battery device 100 being used to provide electrical energy to the electrical device 1000. The electrical device 1000 can be any of the aforementioned devices or systems using the battery device 100. Because the performance of the battery device 100 is improved, it is beneficial to improve the power consumption performance of the electrical device 1000.

[0221] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0222] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: A housing assembly having a receiving cavity and having a first shell wall that participates in forming the receiving cavity; Electrode assembly, housed in the receiving cavity; An electrode assembly, mounted on the first housing wall, includes an electrode body and an adapter. The electrode body is electrically connected to the electrode assembly. The adapter surrounds the electrode body and is insulated from it. The outer periphery of the adapter is welded to the first housing wall. At least one identification portion is formed on the surface of the adapter facing away from the receiving cavity. In the radial direction of the adapter, the identification portion is spaced between the outer periphery of the electrode body and the outer periphery of the adapter. The identification portion is configured to be visually detectable. The surface roughness of the identification part is less than the surface roughness of the remaining part of the side surface of the adapter facing away from the receiving cavity, excluding the identification part, and the surface roughness of the remaining part of the side surface of the adapter facing away from the receiving cavity, excluding the identification part, is less than the surface roughness of the outer peripheral wall of the adapter.

2. The battery cell according to claim 1, characterized in that, The surface roughness Ra of the identification part is less than or equal to 6.3 μm.

3. The battery cell according to claim 1 or 2, characterized in that, The identification part is formed as a straight line segment or a curved segment, and the identification part is parallel to the corresponding part of the outer periphery of the adapter.

4. The battery cell according to any one of claims 1-3, characterized in that, In the radial direction of the adapter, the distance between the identification part and the outer periphery of the adapter is not less than 2 mm.

5. The battery cell according to any one of claims 1-4, characterized in that, In the radial direction of the adapter, the width of the identification part is not less than 0.5 mm.

6. The battery cell according to any one of claims 1-5, characterized in that, In the axial direction of the adapter, the height of the identification part is not less than 0.1 mm and not more than 1 mm.

7. The battery cell according to any one of claims 1-6, characterized in that, The pole assembly further includes a first insulating member, which is disposed on the adapter and located on the side of the adapter facing the receiving cavity. The side of the adapter facing the receiving cavity has a plurality of mating holes. The first insulating member has a plurality of protrusions, which are mated and fixed to the corresponding mating holes. In a direction perpendicular to the axial direction of the adapter, the distance between the identification part and the mating hole is not less than 1 mm.

8. The battery cell according to claim 7, characterized in that, The raised section is fixed to the corresponding mating hole by thermal riveting.

9. The battery cell according to claim 7 or 8, characterized in that, The adapter includes a first adapter portion and a second adapter portion. The first adapter portion is clamped on the side of the pole body facing away from the receiving cavity, and the second adapter portion is clamped on the side of the pole body facing the receiving cavity. The outer edge of the first adapter portion is welded to the second adapter portion. In the radial direction of the adapter, the weld between the first adapter portion and the second adapter portion is located inside the mating hole.

10. The battery cell according to any one of claims 1-9, characterized in that, The adapter includes a first adapter portion and a second adapter portion. The first adapter portion is clamped on the side of the pole body facing away from the receiving cavity, and the second adapter portion is clamped on the side of the pole body facing the receiving cavity. The outer edge of the first adapter portion is welded to the second adapter portion. In the radial direction of the adapter, the weld seam of the first adapter portion and the second adapter portion is located inside the identification part, and the radial distance between the weld seam of the first adapter portion and the second adapter portion and the identification part is not less than 1 mm.

11. The battery cell according to any one of claims 1-10, characterized in that, The identification portion is formed as a groove recessed into the adapter, or the identification portion is formed as a protrusion protruding from the adapter.

12. The battery cell according to claim 11, characterized in that, On the longitudinal section of the adapter, the identification part is formed as a square, semi-circle, racetrack shape, ellipse, triangle, or chamfered rectangle.

13. The battery cell according to any one of claims 1-12, characterized in that, The identification part is integrally extruded into the adapter.

14. The battery cell according to any one of claims 1-13, characterized in that, The identification units are multiple and are spaced apart circumferentially along the adapter.

15. The battery cell according to claim 14, characterized in that, The outer periphery of the adapter is formed into a circular structure, and two of the plurality of identification parts are radially opposite each other along the adapter.

16. The battery cell according to claim 15, characterized in that, The adapter engages with the first shell wall via a positioning structure to restrict the rotation of the adapter about its central axis relative to the shell assembly.

17. The battery cell according to claim 16, characterized in that, The outer periphery of the adapter is formed into a long strip structure, and the two ends of the adapter along its length are respectively corresponding to the identification part.

18. The battery cell according to claim 17, characterized in that, The outer periphery of the adapter is formed into an elongated oval shape and includes two oppositely arranged straight edges and two oppositely arranged arc-shaped edges, each of the arc-shaped edges corresponding to a recognition portion parallel to it; or, The outer periphery of the adapter is elliptical and includes two opposing first long sides and two opposing first short sides, each of which has a corresponding identification portion parallel to it; or, The outer periphery of the adapter is rectangular and includes two oppositely arranged second long sides and two oppositely arranged second short sides, each of which has a corresponding identification part parallel to it.

19. The battery cell according to claim 17, characterized in that, The outer periphery of the adapter includes two oppositely arranged long sides and two oppositely arranged short sides. The short sides extend in an arc shape. The identification part is arranged parallel to the short sides, and the central angle of the identification part is not less than 30° and not more than 90°.

20. The battery cell according to any one of claims 1-19, characterized in that, The housing assembly includes a housing body and a housing cover. One end of the housing body in the axial direction of the adapter is an open end. The housing cover is disposed on the open end and forms the first housing wall. The edge of the adapter has a connecting portion. The end of the connecting portion near the housing cover has an overlapping portion. The end of the housing cover near the pole assembly has a stepped portion. The overlapping portion overlaps the side of the stepped portion away from the receiving cavity and is welded to the stepped portion.

21. The battery cell according to claim 20, characterized in that, The pole assembly further includes a first insulating member disposed on the adapter and located on the side of the adapter facing the receiving cavity. In the radial direction of the adapter, the connecting portion is located radially outside the first insulating member.

22. The battery cell according to claim 21, characterized in that, The battery cell also includes an insulating support, which is disposed on the cover and located within the receiving cavity. The insulating support includes a first portion, which is located radially on the adapter and between the first insulating member and the housing.

23. The battery cell according to claim 22, characterized in that, The electrode assembly includes an active material coating portion disposed within the receiving cavity, and a conductive portion connecting the active material coating portion and the electrode body. The conductive portion includes an electrode tab connected to the active material coating portion. The insulating support further includes a second portion extending from the first portion toward the active material coating portion to isolate the electrode assembly from the active material coating portion.

24. The battery cell according to any one of claims 1-23, characterized in that, The pole assembly also includes a seal, which is sealed between the pole body and the adapter.

25. The battery cell according to claim 24, characterized in that, The electrode post body passes through the adapter and includes an inner clamping portion and an outer clamping portion. The outer clamping portion is clamped on the side of the adapter away from the interior of the housing assembly, and the inner clamping portion is clamped on the side of the adapter closer to the interior of the housing assembly. The sealing member is clamped between the inner clamping portion and the adapter. The electrode post assembly also includes a second insulating member, which is clamped between the outer clamping portion and the adapter. The identification portion is exposed outside the second insulating member.

26. The battery cell according to claim 25, characterized in that, The adapter defines a through hole. The pole body includes a first pole portion and a second pole portion. The first pole portion is a single piece and includes a through portion and the inner clamping portion. The second pole portion is a single piece and includes the outer clamping portion. The through portion passes through the through hole. One end of the through portion near the interior of the housing is connected to the inner clamping portion. The other end of the through portion away from the interior of the housing assembly is welded to the outer clamping portion. The sealing member is disposed at the through hole and surrounds the through portion to clamp between the edge of the adapter near the through hole and the inner clamping portion. The welding position between the through portion and the inner clamping portion is relative to the sealing member near the central axis of the through portion.

27. A battery device, characterized in that, Includes the battery cell according to any one of claims 1-26.

28. An electrical appliance, characterized in that, Includes the battery device according to claim 27.

Images