Battery cell, method for manufacturing a battery cell, battery and electrical device

Abstract

The present invention provides a battery cell (10), a method for manufacturing the battery cell (10), a battery (100), and an electrical device (1000) thereof, wherein the battery cell (10) comprises a case (11) including a first wall (111), and a pole column (12) installed on the first wall (111), the pole column (12) having a connection hole (1223) that penetrates the pole column (12), at least a portion of the inner circumferential wall of the connection hole (1223) being formed as a first inclined surface (12211), and the first inclined surface (12211) is the connection hole (1 The electrode assembly (13) includes an electrode post (12) positioned at an inclination with respect to the axis of 223), and an electrode assembly (13) including an active material coating (131) and a tab (132), wherein the active material coating (131) is installed inside a case (11), the tab (132) is electrically connected to the active material coating (131), and at least a portion of the tab (132) is inserted into a connection hole (1223) and connected to a first inclined surface (12211).

Description

Technical Field

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[0001] [Cross - reference to Related Applications] This application is proposed based on a Chinese patent application with the application number 202311321446.X and the filing date of October 12, 2023, and claims the priority of the Chinese patent application. All the contents of the Chinese patent application are incorporated into this application by reference.

[0002] This application relates to the field of battery technology, particularly to battery cells, methods for manufacturing battery cells, batteries, and their electrical devices.

Background Art

[0003] With the intensification of environmental problems, the maturity of people's environmental protection awareness, and the increase in crude oil prices, more and more people are paying attention to new - energy vehicles when purchasing vehicles. However, the endurance and power performance of new - energy vehicles have an important impact on people's choices. Currently, in most new - energy vehicles, power batteries are adopted as energy - storage and kinetic - energy devices, and power batteries are also widely used in other types of vehicles. The battery energy density of power batteries has an important impact on both the endurance and power performance of vehicles. Therefore, improving the energy density of batteries is a direction that always needs to be studied with great effort in the continuous process of battery improvement and innovation.

[0004] Currently, for the connection and assembly with battery terminals, a long tab structure is provided in the battery. Since the tab is long and has extra parts, it occupies a large space in the battery, reducing the energy density of the battery.

Summary of the Invention

[0005] This application aims to solve at least one of the technical problems in the prior art. For this purpose, this application proposes a battery cell that can significantly improve the energy density of the battery cell.

[0006] This application further proposes a method for manufacturing the above - mentioned battery cell.

[0007] This application further proposes a battery having the above-mentioned battery cell.

[0008] This application further proposes an electrical device having the above-mentioned battery.

[0009] A battery cell according to a first aspect of this application includes a case including a first wall, an electrode post installed in the first wall, wherein a connection hole is formed through the electrode post, and at least a portion of the inner circumferential wall of the connection hole is formed as a first inclined surface, and the first inclined surface is positioned at an inclination with respect to the axis of the connection hole, and an electrode assembly including an active material coating portion and a tab, wherein the active material coating portion is installed in the case, the tab is electrically connected to the active material coating portion, and at least a portion of the tab is inserted into the connection hole and connected to the first inclined surface.

[0010] In the battery cell according to this application, a connection hole is provided on the pole column that penetrates the pole column, and at least a portion of the inner wall of the connection hole is formed as a first inclined surface. By inserting at least a portion of the tab into the connection hole and fixing it to the first inclined surface, the tab occupies less space within the battery cell, the weight of the tab and pole column can be reduced, and the energy density of the battery cell can be improved accordingly.

[0011] In some embodiments of this application, the tab is welded to the pole column.

[0012] In this embodiment, the tab and pole post are connected and fixed by welding, providing a strong and reliable connection. When connecting and fixing, welding requires a small working space and offers a reliable and quick connection effect, making the connection and fixing work between the tab and pole post easier and more efficient.

[0013] In some embodiments of this application, the first inclined surface extends outward along the radial direction of the connection hole in a direction toward the electrode column from the electrode assembly.

[0014] In this embodiment, by positioning the first inclined surface to extend outward along the radial direction of the connection hole, the first inclined surface can be directed toward the end of the connection hole opposite to the electrode assembly. This allows the external device to be easily inserted into the connection hole from the side of the pole facing outwards from the battery cell when fixing the tab to the first inclined surface, making contact with the tab and allowing manipulation of the tab, thereby enabling easy and convenient connection and fixing of the tab to the pole.

[0015] In some embodiments of this application, the angle between the first inclined plane and the first plane perpendicular to the axis of the connection hole is 0° to 70°, or the angle between the first inclined plane and the first plane is 30° to 60°.

[0016] In this embodiment, by limiting the angle between the first inclined plane and the first plane perpendicular to the axis of the connection hole to between 0° and 70°, the demand for welding and fixing the tab and pole column by welding equipment, jigs, etc. can be well met, and a good and stable welding and fixing effect can be obtained between the tab and pole column. By further limiting the angle between the first inclined plane and the first plane, the angle between the first inclined plane and the first plane can be brought into a more appropriate angular range, the tab can be easily and quickly brought into contact with the first inclined plane after being inserted into the connection hole, and welding equipment, jigs, etc. can be positioned more easily and smoothly at the welding position in the connection hole and welding work can be performed on the tab and the first inclined plane.

[0017] In some embodiments of this application, the pole column includes a pole column body, the pole column body is hollow and annular, a projecting connecting boss is provided on the inner wall surface of the pole column body, the pole column body together with the connecting boss defines the connecting hole, and the first inclined surface is formed on the connecting boss.

[0018] In this embodiment, the pole column body defines a connection hole together with the connecting boss, and the first slope is formed on the connecting boss. As a result, the tab can easily adhere directly to the first slope and be connected and fixed to it. The connecting boss can provide good structural reinforcement to the pole column body, thereby increasing the overall structural strength of the pole column. Furthermore, because the first slope is formed on the connecting boss, the connecting boss can better receive the force applied when connecting and fixing the tab to the first slope, thereby allowing the tab to be stably welded and fixed to the first slope.

[0019] In one embodiment of this application, in the axial direction of the connection hole, at least a portion of the surface of the connection boss opposite to the electrode assembly is formed as the first bevel.

[0020] In this embodiment, by providing the first bevel on the side of the connecting boss opposite the electrode assembly, the connecting boss can provide a certain shielding effect between the tab and the electrode assembly in the connection hole. When the tab is welded to the first bevel, the influence and effect on the electrode assembly can be reduced, thereby improving the stability of the electrode assembly during assembly. Furthermore, the connecting boss can provide a certain sealing effect with respect to the electrode column, further improving the stability of the battery cell.

[0021] In some examples of this application, the first slope has a welding region to which the tab is welded, the thickness of the connecting boss at the welding region location in the axial direction of the connecting hole is a first thickness, the depth of the molten pool formed at the welding region location of the connecting boss when the tab and the connecting boss are welded is a first depth, and the first thickness is greater than the first depth.

[0022] In this embodiment, by setting the first thickness to be greater than the first depth, when welding and fixing the tab to the first inclined surface, there is no melting and dropping of the connection boss, and the connection boss can maintain good structural strength and a stable connection and fixing effect with the tab. The possibility of slag and the like generated after the melting and dropping of the connection boss falling onto the electrode assembly is reduced, and the possibility that the high temperature during welding is transmitted to the electrode assembly and damages the electrode assembly is reduced. Thereby, the welding operation between the tab and the pole can be carried out reliably and stably, and the battery cell can maintain good quality.

[0023] In an example of this application, the difference between the first thickness and the first depth is 0.2 mm or more.

[0024] In this embodiment, by setting the difference between the first thickness and the first depth to be 0.5 mm or more, when welding and fixing the connection boss to the tab, the welding device can stably and reliably weld the tab and the first inclined surface, and can surely reduce the possibility of melting and dropping of the connection boss. Thereby, the stability during the assembly of the battery cell can be made better.

[0025] In some specific embodiments of this application, the difference between the first thickness and the first depth is 0.5 mm or more.

[0026] In this embodiment, by further limiting the difference between the first thickness and the first depth, the possibility of melting and dropping of the connection boss when the welding device performs welding operations on the tab and the first inclined surface can be better reduced, and the structure can be made more stable and reliable when assembling and welding the battery cell.

[0027] In some examples of this application, the first inclined surface is connected by an arc to the surface of the connection boss facing the electrode assembly.

[0028] In this embodiment, by connecting the first inclined surface and the surface of the connection boss facing the electrode assembly with an arc, the transition between the first inclined surface and the surface of the connection boss facing the motor assembly can be made smoother. Thereby, the possibility of damaging the tab when fitting and fixing the tab to the first inclined surface can be reduced. Moreover, the position connected by the arc can provide a certain clearance space because the tab is bent toward the first inclined surface, and the tab can be more stably and reliably adhered to the first inclined surface. Thereby, the welding effect is better when welding the tab and the first inclined surface.

[0029] In one embodiment of the present application, the surface of the connection boss facing the electrode assembly and the surface of the pole body facing the electrode assembly are flush.

[0030] In this embodiment, by making the surface of the connection boss facing the electrode assembly and the surface of the pole body facing the electrode assembly flush, and by placing the entire connection boss within the space surrounded by the inner wall of the pole body, the additional space occupied by the connection boss in the battery cell can be reduced. Thereby, it is somewhat advantageous for improving the energy density of the battery cell. Moreover, only the opening structure of the connection hole is formed on the surface of the pole facing the electrode assembly. Thereby, the tab can be freely and stably positioned at the opening position of the connection hole and inserted into the connection hole from the opening to be fitted and fixed to the first inclined surface, and the tab can be easily assembled to the pole.

[0031] In one embodiment of the present application, the minimum width of the connection hole is 3 mm or more.

[0032] In this embodiment, by setting the minimum width of the connection hole to 3 mm or more, the tab can be easily and reliably inserted into the connection hole from the opening of the connection hole and fitted and fixed to the first inclined surface, facilitating the connection and fixing of the tab and the pole.

[0033] [[ID=

[0034] In this embodiment, by limiting the ratio of the minimum width of the connection hole to the thickness of the tab to 1.5 to 5, the connection hole can be given a larger minimum width, making it easier to insert the tab. As can be understood, the connection hole is formed by the inner wall of the pole column body and the first bevel of the connection boss. By limiting the ratio of the minimum width of the connection hole to the thickness of the tab to 1.5 to 2, the first bevel on the connection boss can be given sufficient length, making it easier to weld and fix the tab, thereby ensuring a good fit between the tab and the first bevel when welding the tab to the pole column. By further limiting the ratio of the minimum width of the connection hole to the thickness of the tab to 2.5 to 5, the possibility of the tab being scratched by the wall of the connection hole when the tab is inserted can be better reduced, and the tab can be easily and reliably inserted into the connection hole from the opening position of the minimum width of the connection hole and fitted and fixed to the first bevel.

[0035] In one embodiment of this application, the ratio of the minimum width of the connecting hole to the maximum width of the connecting hole is 0.3 to 0.5, or the ratio of the minimum width of the connecting hole to the maximum width of the connecting hole is 0.35 to 0.45.

[0036] In this embodiment, the design and manufacturing of the pole column can be facilitated by limiting the ratio of the minimum width to the maximum width of the connection hole. In this embodiment, by limiting the ratio of the minimum width to the maximum width of the connection hole to 0.3 to 0.5, the tab can be easily and reliably inserted into the connection hole from the opening at the minimum width position and connected and fixed to the first inclined surface. This allows the first inclined surface formed on the connection boss inside the connection hole to maintain or reduce the height dimension of the original pole column while better meeting the need for connection and fixing to the tab. Furthermore, a small opening structure can be provided at the opening at the minimum width position, thereby maintaining a somewhat weaker communication effect between the case housing cavity and the external environment through the connection hole. This allows the pole column to perform a certain sealing effect on the battery cell. In this embodiment, by further limiting the ratio of the minimum width to the maximum width of the connection hole, the tab can be easily inserted through the connection hole, the first inclined surface can be better and more reliably fitted and connected to the tab, and the overall height dimension of the pole column can be improved and reduced, which is advantageous for improving the energy density of the battery cell.

[0037] In one embodiment of the present application, the pole column further includes a first ring connected to one end of the pole column body facing the electrode assembly, extending outward along the radial direction of the pole column body and extending annularly along the circumferential direction of the pole column body, and a second ring connected to the other end of the pole column body opposite to the electrode assembly, extending outward along the radial direction of the pole column body and extending annularly along the circumferential direction of the pole column body.

[0038] In this embodiment, a first ring and a second ring are installed at both ends of the pole post body. The first and second rings improve the structural strength of the pole post body to some extent, thereby improving the overall structural strength of the pole post. This makes the connection and fixing between the pole post and the tab more stable and reliable, allowing the pole post to participate more effectively in the electrical energy transport operation of the battery cell. The first and second rings together with the pole post body can form a locking groove structure, thereby facilitating the attachment and fixing of the pole post to the battery cell. The structure of the first and second rings is simple and easy to use.

[0039] In some embodiments of this application, the battery cell further includes a fitting block provided in the connection hole, and the tab abuts between the fitting block and the first inclined surface.

[0040] In this embodiment, by installing a fitting block inside the connection hole and fixing the tab in conjunction with the first inclined surface, the tab can stably contact and be fixed on the first inclined surface under the action of the fitting block and maintain a good contact state, thereby facilitating welding of the tab and the pole column. The fitting block is installed inside the connection hole and can provide further structural reinforcement to the pole column. At the same time, the fitting block can provide a certain shielding effect to the opening at one end of the connection hole facing the electrode assembly, thereby providing a certain sealing effect to the pole column, reducing the possibility of electrolyte leakage from the battery cell at the connection hole of the pole column, and giving the battery cell good stability.

[0041] In one embodiment of this application, the fitting block has a second inclined surface parallel to the first inclined surface, and the tab abuts between the first inclined surface and the second inclined surface.

[0042] By installing a second inclined plane parallel to the first inclined plane on the fitting block, the distance between the first and second inclined planes in the extending direction perpendicular to the first inclined plane can always be kept the same. As a result, when welding the tab and pole column, under the coordinated pressing action of the second and first inclined planes, the tab portion that falls onto the first inclined plane can maintain a state of close fixation with the first inclined plane in the extending direction of the first inclined plane. This makes welding the tab and the first inclined plane easier and more stable, and the fitting block can stably and reliably press and fix the tab through the coordinated action of the second and first inclined planes.

[0043] In some examples of this application, in the axial direction of the connection hole, the end face of one end of the fitting block facing the electrode assembly abuts against the electrode assembly.

[0044] In this embodiment, by bringing the fitting block into contact with the electrode assembly, it can perform a restrictive and fixing action on the electrode assembly and tab in the axial direction of the electrode column, and can also perform a certain pressing action on the tab. This allows one end of the tab to be inserted more stably into the connection hole, and the electrode assembly can be positioned more firmly within the battery cell after assembly.

[0045] In one example of this application, the fitting block is welded to the pole column.

[0046] In this embodiment, the fitting block and the pole column are fixed by welding, making the connection easy and reliable. The fitting block can stably and reliably engage with the connecting boss and fix the tab in place, thereby making the connection and fixing between the tab and the pole column more stable and easier.

[0047] In some examples of this application, a support projection is formed on the circumferential wall of the connection hole, the support projection and the first inclined surface are spaced apart in the circumferential direction of the connection hole, and one end of the fitting block is supported by the support projection.

[0048] In this embodiment, a support projection is provided inside the connection hole to support and fix the fitting block. As a result, when assembling the fitting block to the pole column, the support boss provides good support and limiting to the fitting block, reducing the possibility of the fitting block pressing too hard against the first slope. This allows the fitting block and the first slope to work together better to clamp and fix the tab, and the support projection further improves the structural strength of the pole column to some extent, thereby improving the structural stability of the pole column.

[0049] In one example of this application, the angle between the first and second inclined surfaces and the first plane perpendicular to the axis of the connecting hole is between 0° and 60°.

[0050] In this embodiment, by limiting the angle between the first and second inclined surfaces and the first plane perpendicular to the axis of the connection hole to between 0° and 60°, acute angles are formed within a small range for the angle between the first inclined surface and the first plane, and the angle between the second inclined surface and the first plane. As a result, the first and second inclined surfaces are gently inclined in the radial direction of the connection hole, and when welding the tab and pole column, the welding direction of the welding device is perpendicular to the extending direction of the first and second inclined surfaces. Therefore, the welding device can be inserted into the connection hole at a small angle to perform the welding work, thereby better reducing interference between the hole wall of the connection hole and the welding device, jigs, etc., making welding and fixing the tab and pole column convenient and easy.

[0051] In some specific embodiments of this application, the angle between the first and second inclined planes and the first plane is between 0° and 20°.

[0052] In this embodiment, by further limiting the angle between the first and second bevels and the first plane to 0° to 20°, the first and second bevels can extend more gently along the radial direction of the connection hole, and the first and second bevels can better face the opening of the connection hole opposite to the electrode assembly, thereby allowing welding equipment, jigs, etc. to be inserted more easily, conveniently, and quickly to reach the welding position between the first and second bevels, and making welding and fixing of the tab and pole column easier and more efficient.

[0053] In one example of this application, the other end of the fitting block extends to the other side wall of the connecting hole that faces the support projection.

[0054] In this embodiment, by extending the other end of the fitting block to the other side wall of the connection hole opposite the support projection, the fitting block and the support projection can be fitted together to achieve a good sealing effect with respect to the connection hole. The end of the first bevel tab inserted into the connection hole can be sealed between the first and second bevels, thereby significantly reducing the probability of the welded area between the tab and the first bevel coming into contact with the outside atmosphere through the connection hole, and making the electrical connection between the tab and the pole column more stable and reliable. The fitting block can form a good contact and fixing effect with the side wall of the connection hole, thereby providing a better structural reinforcement effect with respect to the pole column, making the overall structure of the pole column more stable and robust.

[0055] In some specific embodiments of this application, the fitting block, the tab, and the pole post are integrally welded together.

[0056] In this embodiment, by welding the fitting block, tab, and pole post together as a single unit, the connection and fixing of the fitting block, tab, and pole post are made stronger and more secure, and the fitting block and pole post can be firmly fixed by the tab.

[0057] In one embodiment of this application, the material of the fitting block and the material of the pole column are the same.

[0058] In this embodiment, by making the material of the fitting block the same as the material of the pole column, the welding and fixing of the fitting block and the pole column can be made easier, the weld can be made stronger, and the welding effect can be improved.

[0059] In some embodiments of this application, the active material coating includes a current collector and an active material layer provided on the current collector, the tab is electrically connected to the current collector, the tab includes a plurality of tab sheets, the tab sheets closer to the current collector are bundled together to form a first throttling portion, the tab sheets further away from the current collector are bundled together and connected to form a second throttling portion, the first throttling portion is connected to the second throttling portion and the active material coating, and at least a portion of the second throttling portion is inserted into the connection hole and connected to the first inclined surface.

[0060] In this embodiment, by bundling multiple tab sheets together to form a tab, when welding and fixing the tab to the pole column, the multiple tab sheets and the pole column can be easily and reliably connected and fixed via the second constricted portion, and the second constricted portion can be made to have a small thickness, thereby allowing the tab to be inserted into the connection hole and fixed to the first slope more easily and conveniently.

[0061] In one embodiment of this application, at least a portion of the first diaphragm is inserted into the connecting hole and extends along the first inclined surface.

[0062] In this embodiment, by inserting at least a portion of the first constricted portion into the connection hole and extending it along the first inclined surface, the tab and the first inclined surface can be given a longer contact and fixing dimension, thereby making the connection and fixing between the tab and the first inclined surface more stable and reliable, allowing the tab to occupy less space within the case, thereby increasing the size of the active material coating portion and improving the energy density of the battery cell, and further reducing the excess portion of the tab within the case, thereby further reducing the probability of a short circuit occurring between the tab and the active material coating portion, and thereby making the use of the battery cell more stable and reliable.

[0063] In one embodiment of this application, the ratio of the overlap width between the first inclined surface and the second constricted portion to the width of the first inclined surface is 0.5 or more.

[0064] In this embodiment, by limiting the ratio of the overlap width between the second constriction portion and the first inclined surface to the width of the first inclined surface to 0.5 or more, a sufficient overlap length is provided between the second constriction portion and the first inclined surface, thereby stabilizing and strengthening the connection between the second constriction portion and the first inclined surface, and thereby stabilizing and strengthening the connection and fixing between the tab and the pole column.

[0065] In some examples of this application, the ratio of the overlap width between the second aperture and the first inclined surface to the width of the first inclined surface is 0.8 to 1.2.

[0066] In this embodiment, by further limiting the ratio of the overlap width between the second constriction portion and the first inclined surface to the width of the first inclined surface, the second constriction portion and the first inclined surface can be better overlapped and fitted, the second constriction portion can maintain a large overlap surface and overlap length with the first inclined surface, the connection and fixing between the tab and the pole column can be made more stable and robust, the excess portion dimensions of the first inclined surface or the second constriction portion can be reduced, the second constriction portion and the first inclined surface can be more easily fitted and brought into contact, and thereby the space occupied by the tab and the pole column in the battery cell can be reduced to some extent.

[0067] In some embodiments of this application, the battery cell further includes a cover plate which is fitted over the end of the connection hole opposite to the electrode assembly, and the cover plate is sealed to the electrode post.

[0068] In this embodiment, a cover plate is installed that is sealed to the pole post, ensuring a secure seal between the fitting block and tab structure located within the connection hole. After welding the tab and pole post together, a good sealed environment is maintained, thereby ensuring a stable and good connection between the tab and pole post during long-term use. The cover plate can transmit electricity in combination with the pole post, and the cover plate can form a good electrical connection surface, allowing the battery cell to be easily connected to the electrical connection member when in use.

[0069] In one embodiment of this application, a groove is formed on the surface of the pole column opposite to the electrode assembly, the connection hole is formed inside the groove and penetrates the bottom wall of the groove, and the cover plate is provided inside the groove.

[0070] In this embodiment, a groove is provided on the pole column, which makes it easier to position the cover plate and the pole column when fixing them together, and ensures a stable and secure connection.

[0071] In some examples of this application, the side walls of the grooves extend inclined outward along the radial direction of the connection holes in the direction from the electrode assembly toward the cover plate.

[0072] In this embodiment, by extending the side walls of the groove outward along the radial direction of the connection hole, a certain guiding action can be performed on the cover plate and pole column during assembly, the cover plate can be easily fixed in the groove, the structure is simple, assembly is easy, high welding quality can be achieved when welding the cover plate and pole column, and a good welded sealing effect can be provided between the cover plate and pole column.

[0073] In some examples of this application, the surface of the cover plate opposite to the electrode assembly and the end face of the pole column opposite to the electrode assembly are flush.

[0074] In this embodiment, by making the surface of the cover plate opposite to the electrode assembly flush with the end face of the pole opposite to the electrode assembly, a continuous plane is formed when the cover plate and pole are combined. This reduces the space occupied by the cover plate to some extent and increases the electrical connection surface between the battery cell and the pole, thereby improving the energy density of the battery cell to some extent and allowing the battery cell to be easily electrically connected to the electrical connection member via the end of the pole opposite to the electrode assembly.

[0075] A method for manufacturing a battery cell according to a second aspect of this application, wherein the battery cell is a battery cell according to a first aspect of this application, and the manufacturing method includes the steps of inserting one end of a tab into a connection hole of a pole column, bringing one surface of the one end of the tab in the thickness direction into contact with a first inclined surface, and welding the one end of the tab to the first inclined surface.

[0076] In the battery cell manufacturing method according to the embodiment of this application, by inserting the tab into the connection hole of the pole post and fixing it in contact with the first inclined surface by welding, the tab occupies less space within the battery cell, the weight of the tab and pole post can be reduced, and thereby the energy density of the battery cell can be improved.

[0077] In some embodiments of this application, the step of bringing one surface of one end of the tab in the thickness direction into contact with the first bevel includes the step of placing a fitting block into a connecting hole and pressing the one end of the tab with the fitting block toward the first bevel until it contacts the first bevel.

[0078] In this embodiment, by pressing one end of the tab toward the first inclined surface with the fitting block, the tab can be stably and reliably bonded and brought into contact with the first inclined surface under the action of the fitting block. The fitting block reduces the degree to which the mechanical device for driving the fitting block to move is inserted into the connection hole, thereby allowing the tab to be easily and conveniently brought into contact and fixed to the first inclined surface.

[0079] A battery according to a third aspect of this application includes a battery cell according to a first aspect of this application.

[0080] In the battery according to this application, the battery cell according to the first embodiment is installed, a connection hole is provided on the pole column that penetrates the pole column, and at least a part of the inner wall of the connection hole is formed as a first inclined surface, and at least a part of the tab is inserted into the connection hole and fixedly connected to the first inclined surface, thereby the tab occupies less space within the battery cell, the weight of the tab and pole column can be reduced, and the energy density of the battery cell can be improved accordingly.

[0081] An electrical device according to a fourth aspect of this application includes a battery according to a third aspect of this application for supplying electrical energy.

[0082] In the electrical device according to this application, a battery according to the third embodiment described above is installed, a connection hole is provided on the pole column that penetrates the pole column, and at least a part of the inner wall of the connection hole is formed as a first inclined surface, and at least a part of the tab is inserted into the connection hole and fixedly connected to the first inclined surface, thereby the tab occupies less space within the battery cell, the weight of the tab and pole column can be reduced, and the energy density of the battery cell can be improved accordingly.

[0083] Additional aspects and advantages of this application are, in part, shown in the following description, in part, apparent in the following description, or understood by practice of this application. [Brief explanation of the drawing]

[0084] [Figure 1] This is a schematic diagram of an electrical device according to an embodiment of the present application. [Figure 2] Figure 1 is an exploded view of the battery. [Figure 3] Figure 2 is a cross-sectional view of a battery cell. [Figure 4] Figure 3 is a schematic diagram of the electrode assembly. [Figure 5] Figure 3 is a schematic diagram of the polar column. [Figure 6] Figure 3 is a schematic diagram of the interlocking block. [Figure 7] Figure 3 is a schematic diagram showing how the electrode assembly is assembled with the case and electrode posts. [Figure 8] Figure 3 is a schematic diagram showing how the fitting block is assembled with the case, pole column, and electrode assembly. [Figure 9] This is a cross-sectional view of a battery cell according to another embodiment of this application. [Figure 10] Figure 9 is a schematic diagram of the interlocking block. [Figure 11]Figure 9 is a schematic diagram showing how the case is assembled with the pole column and electrode assembly. [Figure 12] Figure 9 is a schematic diagram showing how the mating block is assembled with the case, pole column, and electrode assembly. [Figure 13] This is a schematic diagram of a battery cell according to an embodiment of this application. [Modes for carrying out the invention]

[0085] The embodiments of the technical proposal of this application will be described in detail below with reference to the drawings. The following embodiments are merely examples, provided to more clearly illustrate the technical proposal of this application, and do not limit the scope of protection of this application.

[0086] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application pertains. The terms used herein are for illustrative purposes only and are not intended to limit this application. The terms “including” and “having” and any variations thereof in the description and claims of this application, as well as in the description of the drawings, are intended to intentionally cover the non-exclusive “including.”

[0087] In the description of the embodiments of this application, technical terms such as “first,” “second,” etc., are intended solely to distinguish different subjects and should not be understood as indicating or implying relative importance, or implicitly indicating the number, specific order, or hierarchical relationship of the indicated technical features. In the description of the embodiments of this application, unless otherwise explicitly limited, “multiple” means two or more.

[0088] The “Examples” as used herein mean that certain features, structures, or properties described in combination with the Examples may be included in at least one Example of this Application. The “Examples” as used in various parts of this Specification do not necessarily refer to the same Example, nor do they represent mutually exclusive, independent, or alternative Examples. Those skilled in the art will understand, both explicitly and implicitly, that the Examples described herein can be combined with other Examples.

[0089] In the description of the embodiments of this application, the term "multiple" means two or more (including two), similarly, "multiple groups" means two or more groups (including two groups), and "multiple sheets" means two or more (including two sheets).

[0090] In the description of the embodiments of this application, the orientations or positional relationships indicated by technical terms such as "length," "width," "thickness," "top," "bottom," "front," "back," "left," "right," "bottom," "axial direction," "radial direction," and "circumferential direction" are orientations or positional relationships shown based on the drawings, and are merely for the purpose of easily describing and simplifying the embodiments of this application. They do not indicate or imply that the shown devices or elements necessarily have a specific orientation, or that they are constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of this application.

[0091] In the description of the embodiments of this application, unless otherwise specifically defined and limited, technical terms such as “attachment,” “connection,” “linking,” and “fixing” should be understood in a broad sense, for example, a fixed connection, a removable or integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, or internal communication or interaction relationship between two elements. Those skilled in the art will be able to understand the specific meaning of the above terms in the embodiments of this application depending on the specific circumstances.

[0092] Currently, given the development of the market, the applications of power batteries are expanding more and more. Power batteries are not only used in energy storage and power systems such as hydroelectric power plants, thermal power plants, wind power plants, and solar power plants, but are also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As an important component of new energy vehicles, power batteries have high demands in terms of both energy density and reliability.

[0093] In the processing and manufacturing of battery cells, it is necessary to connect tabs inside the case to electrode posts. Tabs consist of multiple tab sheets drawn out from the electrode sheet inside the battery cell. Generally, an adapter sheet is installed inside the battery cell and welded to the multiple tab sheets, and then the adapter sheet is welded to the electrode posts. However, there is also a connection method in which the multiple tab sheets are ultrasonically tack-welded before being welded to the adapter sheet. To meet the demands of the process, in order to securely and stably connect the tabs to the adapter sheet and electrode posts, the tabs need to be drawn out long and have a certain amount of extra length. When long tabs are placed inside the battery cell, they occupy a large amount of space, reducing the energy density of the battery cell. Furthermore, the installed adapter sheet also reduces the energy density of the battery cell. Long tabs are prone to short-circuiting with the electrode sheet, causing short circuits inside the battery, which reduces the stability of the battery cell.

[0094] The connection between the tabs and poles in a battery cell may be further carried out by a combined process of tab tack welding and pole laser welding. Specifically, the tabs are tack-welded and then directly connected to the poles by laser welding. This eliminates the need for adapter sheets and significantly improves the energy density of the battery cell. However, the tabs still require a long length and have a certain amount of extra space to ensure a secure and stable connection to the poles, and the tabs occupy a large amount of space within the battery cell, reducing the energy density of the battery cell.

[0095] Based on the above considerations, in order to reduce the space occupied by the tabs and improve the capacity density of the battery cell, this application provides a method in which the battery cell is installed, connection holes are provided on the poles, a first inclined surface is installed within the connection holes, and the tabs are fixedly connected to the first inclined surface, thereby the tabs occupy a small space within the battery cell, and the energy density of the battery cell is improved accordingly.

[0096] In this application, the battery cell 100 may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, but is not limited to these in the embodiments of this application. The battery cell 100 may be cylindrical, flat, rectangular, or have other shapes, and is not limited to these in the embodiments of this application. Generally, the battery cell 100 can be divided into three types according to the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and is not limited to these in the embodiments of this application.

[0097] As referred to in the embodiments of this application, the battery 100 means a single physical module containing one or more battery cells 10 to provide higher voltage and capacity. For example, the battery 100 referred to in this application may be a battery module or a battery pack 100. A battery module generally contains multiple battery cells 10. A battery pack 100 generally includes a housing 20 for packaging one or more battery cells 10 or one or more battery modules. The housing 20 can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells 10.

[0098] The battery cell 10 disclosed in the embodiments of this application can be used in an electrical device 1000 powered by a battery 100 or in various energy storage systems that use the battery 100 as an energy storage element. The electrical device 1000 may be, but is not limited to, a mobile phone, tablet, laptop computer, electric toy, power tool, electric motorcycle, electric car, ship, or spacecraft. Here, electric toys may include stationary or portable electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, and spaceships, etc.

[0099] In the following embodiments, for the sake of explanation, the electrical device 1000 of the embodiments of this application will be described as being a vehicle.

[0100] As shown in Figure 1, Figure 1 is a schematic diagram of an electrical device 1000 according to an embodiment of the present application. The vehicle may be a fuel oil vehicle, a natural gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. A battery 100 is installed inside the vehicle, and the battery 100 can be installed at the bottom, front, or rear of the vehicle. The battery 100 may be used to supply power to the vehicle, for example, the battery 100 can function as the operating power source for the vehicle. The vehicle may further include a controller 200 and a motor 300, the controller 200 being used to control the battery 100 to supply power to the motor 300 for, for example, the vehicle's starting, navigation, and operating power consumption needs during driving.

[0101] In some embodiments of this application, the battery 100 can not only function as a power source for the vehicle, but can also provide driving force to the vehicle by replacing or partially replacing fuel or natural gas as a power source for the vehicle.

[0102] Please refer to Figure 2, which is an exploded view in which battery cells 10 according to some embodiments of the present application are used in a battery 100. The battery 100 includes a housing 20 and a plurality of battery cells 10, the battery cells 10 being housed within the housing 20. Here, the housing 20 is used to provide assembly space for the battery cells 10, and the housing 20 can be of various structures. In some embodiments, the housing 20 may include a first housing 201 and a second housing 202, the first housing 201 and the second housing 202 overlapping each other, and the first housing 201 and the second housing 202 jointly define assembly space for housing the battery cells 10. The second housing 202 may be a hollow structure with one end open, and the first housing 201 may be a plate-like structure, with the first housing 201 covering the open side of the second housing 202, thereby jointly defining the assembly space between the first housing 201 and the second housing 202, or both the first housing 201 and the second housing 202 may be hollow structures with one end open (as shown in Figure 2), with the open side of the first housing 201 covering the open side of the second housing 202. Of course, the housing 20 formed by the first housing 201 and the second housing 202 may be of various shapes, such as a cylinder or a rectangular parallelepiped.

[0103] In the battery 100, the multiple battery cells 10 may be connected in series, in parallel, or in series-parallel. Series-parallel connection means that some of the multiple battery cells 10 are connected in series, while others are connected in parallel. The multiple battery cells 10 may be directly connected in series, in parallel, or in series-parallel before the entire assembly of the multiple battery cells 10 is housed in the housing 20. Alternatively, the battery 100 may be configured as a battery module by connecting the multiple battery cells 10 in series, in parallel, or in series-parallel, and then the multiple battery modules may be connected together in series, in parallel, or in series-parallel before being housed in the housing 20. The battery 100 may further include other structures, for example, the battery 100 may further include bus members, electrical connection members, etc., for realizing electrical connections between the multiple battery cells 10.

[0104] Hereinafter, a battery cell 10 according to an embodiment of the first aspect of this application will be described with reference to Figures 3 to 11. Figure 3 is a cross-sectional view of the battery cell 10 shown in Figure 2, Figure 4 is a schematic diagram of the electrode assembly 13 shown in Figure 3, Figure 5 is a schematic diagram of the electrode post 12 shown in Figure 3, Figure 6 is a schematic diagram of the fitting block 14 shown in Figure 3, Figure 7 is a schematic diagram of the assembly of the electrode assembly 13 shown in Figure 3 with the case 11 and electrode post 12, Figure 8 is a schematic diagram of the assembly of the fitting block 14 shown in Figure 3 with the case 11, electrode post 12 and electrode assembly 13, Figure 9 is a cross-sectional view of the battery cell 10 according to another embodiment of this application, Figure 10 is a schematic diagram of the fitting block 14 shown in Figure 9, Figure 11 is a schematic diagram of the assembly of the case 11 shown in Figure 9 with the electrode post 12 and electrode assembly 13, Figure 12 is a schematic diagram of the assembly of the fitting block 14 shown in Figure 9 with the case 11, electrode post 12 and electrode assembly 13, and Figure 13 is a schematic diagram of the battery cell 10 according to an embodiment of this application.

[0105] As shown in Figures 3 to 13, the battery cell 10 according to an embodiment of the first aspect of this application includes a case 11, an electrode post 12, and an electrode assembly 13. Specifically, the case 11 includes a first wall 111, the electrode post 12 is installed in the first wall 111, and a connection hole 1223 is formed through the electrode post 12, at least a portion of the inner circumferential wall of the connection hole 1223 is formed as a first inclined surface 12211, the first inclined surface 12211 is positioned at an inclination with respect to the axis of the connection hole 1223, and the electrode assembly 13 includes an active material coating portion 131 and a tab 132. The active material coating portion 131 is installed inside the case 11, the tab 132 is electrically connected to the active material coating portion 131, and at least a portion of the tab 132 is inserted into the connection hole 1223 and connected to the first inclined surface 12211.

[0106] The shape of the case 11 can be adjusted according to the type of battery cell 10. For example, if the battery cell 10 is a rectangular battery 100, the case 11 is rectangular, and if the battery cell 10 is a cylindrical battery 100, the case 11 is cylindrical. In the embodiments of this application, the case 11 is rectangular in all cases. As shown in Figure 3, the case 11 may be an aluminum case, a stainless steel case, or the like. The case 11 is used to house the electrode assembly 13 in the battery cell 10 and to fix the poles 12. The first wall 111 of the case 11 is formed at one end in the longitudinal direction (up and down direction shown in Figure 3). When assembling the battery cell 10, the electrode assembly 13 may be placed in the housing cavity 112 of the case 11, and the poles 12 may be fixed on the first wall 111 of the case 11. Specifically, the first wall 111 of the case 11 may be provided with mounting holes that penetrate the first wall 111 along the thickness direction (up and down direction shown in Figure 3). The poles 12 are provided in the mounting holes and fixedly connected to the case 11. For example, the poles 12 may be welded or crimped to the case 11.

[0107] The electrode posts 12 are used to connect the battery cell 10 to the electrical connection member and to transport electrical energy. The material of the electrode posts 12 may be copper, aluminum, zinc, or an alloy thereof, and the shape of the electrode posts 12 may be circular, rectangular, or other shapes depending on the design requirements. Generally, there are at least two electrode posts 12, specifically, at least one positive electrode post and at least one negative electrode post. For example, if there are two electrode posts 12, one is a positive electrode post and the other is a negative electrode post, and both are electrically connected to the positive and negative tabs 132 of the electrode assembly 13. Alternatively, if there are four electrode posts 12, two may be positive electrode posts and two may be negative electrode posts. In this case, both positive electrode posts are electrically connected to the positive electrode tab of the battery core assembly, and both negative electrode posts are electrically connected to the negative electrode tab of the battery core assembly.

[0108] The electrode assembly 13 is typically formed by laminating or winding electrode sheets and separators, the electrode sheets including a positive electrode sheet and a negative electrode sheet, the positive electrode tab drawn from the positive electrode sheet being electrically connected to the positive electrode column, and the negative electrode tab drawn from the negative electrode sheet being electrically connected to the negative electrode column.

[0109] The positive electrode sheet generally includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer can be directly or indirectly coated onto the positive electrode current collector to form the positive electrode active material coating of the electrode assembly 13. The portion of the positive electrode current collector on which the positive electrode active material layer is not coated protrudes from the positive electrode active material coating to form a positive electrode tab sheet. Multiple positive electrode tab sheets are stacked to form a positive electrode tab, which is drawn out from the positive electrode sheet and electrically connected to the positive electrode active material coating. The materials of the positive electrode current collector and the positive electrode active material coating are set according to the type of battery cell 10. For example, if the battery 100 is a lithium-ion battery, the material of the positive electrode current collector may be aluminum, and the material of the positive electrode active material coating may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide.

[0110] The negative electrode sheet generally includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer can be directly or indirectly coated onto the negative electrode current collector to form the negative electrode active material coating of the electrode assembly 13. The portion of the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode active material coating to form a negative electrode tab sheet. Multiple negative electrode tab sheets are stacked to form a negative electrode tab, which is drawn out from the negative electrode sheet and electrically connected to the negative electrode active material coating. The materials of the negative electrode current collector and the negative electrode active material coating are set according to the type of battery cell 10. For example, if the battery 100 is a lithium-ion battery, the material of the negative electrode current collector may be copper, and the material of the negative electrode active material coating may be carbon or silicon, etc. The material of the separator is not limited; for example, the separator may be a polypropylene film or a polyethylene film, etc.

[0111] For the sake of explanation, in the embodiments of this application, positive and negative electrodes such as the pole column 12, tab 132, and electrode sheet are described without distinction, and the pole column 12, tab 132, electrode sheet, etc., and descriptions thereof relating to the embodiments of this application can be applied to structures such as positive electrode tabs, positive electrode poles, and positive electrode sheets, or to structures such as negative electrode tabs, negative electrode poles, and negative electrode sheets, or to structures such as positive and negative tabs 132, positive and negative electrode poles 12, and positive and negative electrode sheets.

[0112] In this embodiment, at least a portion of the tab 132 is inserted into the connection hole 1223; that is, the tab 132 may be partially inserted into the connection hole 1223, or the tab 132 may be entirely inserted into the connection hole 1223.

[0113] In this embodiment, a connecting hole 1223 is formed on the pole column 12, and the shape of the connecting hole 1223 may match the shape of the pole column 12. At least a portion of the inner circumferential wall of the connecting hole 1223 is formed as a first inclined surface 12211. That is, the inner circumferential wall of the connecting hole 1223 may be partially formed as a first inclined surface 12211, or the entire inner circumferential wall of the connecting hole 1223 may be formed as a first inclined surface 12211, where "entirely" means that the first inclined surface 12211 can extend from one end to the other in the axial direction of the connecting hole 1223. The inclination angle and dimensions of the first slope 12211 may be set reasonably according to the requirements. When fixing the tab 132 to the first slope 12211, the tab 132 may be inserted into the connection hole 1223 of the pole column 12 and inclined toward the first slope 12211, thereby allowing the tab 132 to be attached to the first slope 12211. After attaching the tab 132 to the first slope 12211, the tab 132 may be connected to the first slope 12211 by welding, crimping, bolting, etc.

[0114] In this embodiment, a case 11 is installed, and as an indispensable component of the battery cell 10, the case 11 facilitates the assembly and fixing of the electrode assembly 13 and the electrode post 12 in the battery cell 10. The case 11 provides good protection and sealing to the electrode assembly 13, thereby enabling the battery cell 10 to maintain a stable structural and operational state during processing, transportation, and use. The structure is simple and highly efficient.

[0115] In this embodiment, since the pole column 12 is provided with a through-hole 1223, the weight of the pole column 12 can be reduced, thereby improving the energy density of the battery cell 10 to some extent. Furthermore, since at least a portion of the tab 132 is inserted into the connection hole 1223 of the pole column 12 and connected and fixed to the pole column 12, the space occupied by the tab 132 within the battery cell 10 can be partially overlapped, significantly reducing the space occupied by the tab 132 within the battery cell 10 and improving the energy density of the battery cell 10.

[0116] To make it easier to understand, when connecting and fixing the tab 132 to the pole column 12, a sufficient connection surface is required between the tab 132 and the pole column 12. Specifically, the fixing connection length between the tab 132 and the pole column 12 must meet a certain requirement. In this embodiment, when inserting at least a portion of the tab 132 into the connection hole 1223 of the pole column 12 to connect and fix it to the pole column 12, the height dimension of the pole column 12 must be adaptively adjusted according to the height dimension of the tab 132 to the pole column 12. If the height dimension of the tab 132 to the pole column 12 (up and down direction as shown in Figure 3) is long, the height of the pole column 12 must be increased. This increases the weight and volume of the pole column 12, thereby reducing the energy density of the battery cell 10. The height dimension of the pole column 12 here refers to the length dimension of the connection hole 1223 of the pole column 12 in the axial direction.

[0117] In this embodiment, a first inclined surface 12211 is formed on at least a portion of the inner wall of the connection hole 1223 of the pole column 12, and the first inclined surface 12211 is positioned at an inclination with respect to the axis of the connection hole 1223, so that the first inclined surface 12211 has a short length in the axial direction of the connection hole 1223 and a long length in the inclination direction, and when at least a portion of the tab 132 is inserted into the connection hole 1223 and fixedly connected to the first inclined surface 12211, the tab 132 can be fixed to the first inclined surface 12211 along the inclination direction of the first inclined surface 12211, thereby the first inclined surface The tab 132 can have a sufficient connection and fixing length to the pole column 12, thereby allowing the tab 132 to be stably and securely connected to the pole column 12. The tab 132 has a small arrangement dimension in the axial direction of the connection hole 1223, so the height dimension of the pole column 12 can be set based on the normal dimension or shortened to some extent, thereby keeping the weight and volume of the pole column 12 constant or decreasing. Thus, by using a method of fixing the tab 132 to the first inclined surface 12211, the battery cell 10 can be given a higher energy density.

[0118] Since the tab 132 is inserted into the connection hole 1223 and fixed on the first inclined surface 12211, when the tab 132 is fixed to the pole column 12 and assembled, it is stable and easy, reducing the chance of the tab 132 falling off. Furthermore, in the manufacturing process of the tab 132, the length of the tab 132 required for connection and fixing can be easily determined, thereby reducing the excess portion of the tab 132, reducing the weight and volume of the tab 132 to some extent, and consequently further improving the energy density of the battery cell 10.

[0119] To make it clear, the electrode sheet in the battery cell 10 has a positive electrode sheet and a negative electrode sheet. In this embodiment, the tab 132 has a good blocking effect with the electrode sheet of the other polarity in the case 11 after being electrically connected to the first inclined surface 12211, thereby reducing the probability of a short circuit in the battery cell 10 and improving the stability of the battery cell 10.

[0120] In the battery cell 10 according to the embodiment of this application, a connection hole 1223 is provided on the pole column 12, penetrating the pole column 12, and at least a portion of the inner wall of the connection hole 1223 is formed as a first inclined surface 12211. At least a portion of the tab 132 is inserted into the connection hole 1223 and fixedly connected to the first inclined surface 12211. As a result, the tab 132 occupies less space within the battery cell 10, the weight of the tab 132 and the pole column 12 can be reduced, and the energy density of the battery cell 10 can be improved.

[0121] In some embodiments of this application, the tab 132 may be welded to the pole column 12.

[0122] The tab 132 and the pole column 12 are welded together, and for example, the tab 132 and the pole column 12 may be welded and fixed by a welding method such as ultrasonic welding, laser welding, or resistance thermal fusion welding.

[0123] In this embodiment, the tab 132 and the pole column 12 are connected and fixed by welding, resulting in a strong and reliable connection. When connecting and fixing, welding provides a small working space and a reliable and quick connection effect, making the connection and fixing work between the tab 132 and the pole column 12 easier and more efficient.

[0124] In some embodiments of this application, as shown in Figures 3 to 5, the first inclined surface 12211 may extend outward inclined along the radial direction (left-right direction shown in Figure 3) of the connection hole 1223 in the direction from the electrode assembly 13 toward the pole column 12.

[0125] As shown in Figures 3 and 4, the direction from the electrode assembly 13 toward the pole column 12 is the direction from the side of the pole column 12 facing the inside of the battery cell 10 toward the side facing the outside of the battery cell 10, in the axial direction of the connection hole 1223 (up and down direction shown in Figure 3). In this embodiment, the first inclined surface 12211 extends outward along the radial direction of the connection hole 1223, and the tab 132 is inserted into the connection hole 1223 from the side of the first inclined surface 12211 facing the electrode assembly 13 and extends outward along the first inclined surface 12211 in the radial direction of the connection hole 1223. In the actual assembly process, the tab 132 may first be inserted into the connection hole 1223 along the axial direction of the connection hole 1223, and then the tab 132 may be bent toward the first inclined surface 12211 and attached to the first inclined surface 12211, thereby fixing the first inclined surface 12211.

[0126] In this embodiment, the first inclined surface 12211 is positioned to extend outward inclined along the radial direction of the connection hole 1223, so that the first inclined surface 12211 can face the end of the connection hole 1223 opposite to the electrode assembly 13. This allows the external device to be easily inserted into the connection hole 1223 from the side of the pole 12 facing outwards from the battery cell 10, making contact with and manipulating the tab 132, thereby making the connection and fixing between the tab 132 and the pole 12 easy and convenient.

[0127] In some embodiments of this application, the angle between the first inclined surface 12211 and the first plane perpendicular to the axis of the connecting hole 1223 may be 0° to 70°.

[0128] In this embodiment, the angle between the first inclined surface 12211 and the first plane perpendicular to the axis of the connection hole 1223 is limited to 0° to 70°. For example, the angle may be 10°, 20°, 30°, 40°, 50°, 60°, etc. As shown in Figure 3, the straight line L in the drawing represents the axis of the connection hole 1223, the straight line L1 represents the first plane, the first plane is set perpendicular to the axis, and the extension line L2 of the first inclined surface 12211 toward the first plane and the first plane L1 form an angle α.

[0129] To make it easier to understand, when welding the tab 132 to the pole column 12, the welding position between the tab 132 and the pole column 12 is within the connection hole 1223 of the pole column 12. The wall of the connection hole 1223 causes certain obstruction and interference to the positioning and movement of welding equipment, jigs, etc. In this embodiment, by limiting the angle between the first inclined surface 12211 and the first plane perpendicular to the axis of the connection hole 1223 to between 0° and 70°, the requirements for welding and fixing the tab 132 to the pole column 12 by welding equipment, jigs, etc. can be well met, and a good and stable welding and fixing effect can be obtained between the tab 132 and the pole column 12.

[0130] In one embodiment of this application, the angle between the first inclined plane 12211 and the first plane may be 30° to 60°.

[0131] In this embodiment, the angle between the first inclined surface 12211 and the first plane perpendicular to the axis of the connecting hole 1223 is limited to 30° to 60°. For example, the angle may be 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc.

[0132] In this embodiment, by further limiting the angle between the first inclined surface 12211 and the first plane, the angle between the first inclined surface 12211 and the first plane can be brought within a more appropriate angular range, allowing the tab 132 to be easily and quickly brought into contact with the first inclined surface 12211 after being inserted into the connection hole 1223, and enabling welding equipment, jigs, etc. to be positioned more easily and smoothly at the welding location within the connection hole 1223 to perform welding work on the tab 132 and the first inclined surface 12211.

[0133] In some embodiments of this application, as shown in Figure 5, the pole column 12 may include a pole column body 122, the pole column body 122 being hollow annular, with a projecting connecting boss 1221 provided on the inner wall surface of the pole column body 122, the pole column body 122 and the connecting boss 1221 together defining a connecting hole 1223, and the first inclined surface 12211 being formed on the connecting boss 1221.

[0134] The pole column body 122 is installed as a hollow annular structure, and for example, the cross-section of the pole column body 122 may be formed as an annular structure such as a circular, waist-shaped frame, or rectangular frame. The connecting boss 1221 is installed on the inner wall surface of the pole column body 122, and specifically, the side of the connecting boss 1221 closest to the inner wall surface of the pole column body 122 may be bonded to the inner wall surface of the pole column body 122 and connected to the inner wall surface of the pole column body 122, the connecting boss 1221 may be installed separately from the pole column body 122, or the connecting boss 1221 may be formed as an integral structure with the pole column body 122, and the material of the connecting boss 1221 may be the same as or different from the material of the pole column body 122.

[0135] In this embodiment, the pole column body 122 defines a connection hole 1223 together with the connection boss 1221, and the first inclined surface 12211 is formed on the connection boss 1221. Specifically, as shown in Figures 3 and 4, the first inclined surface 12211 is located on the opposite side of the electrode assembly 13 of the connection boss 1221 in the axial direction of the pole column 12, and the first inclined surface 12211 may be formed as part of the hole wall of the connection hole 1223. After inserting the tab 132 into the connection hole 1223, the tab 132 can be easily brought into close contact with the first inclined surface 12211 and connected and fixed to the first inclined surface 12211.

[0136] In this embodiment, a protruding connecting boss 1221 is installed on the inner wall surface of the pole column body 122. The connecting boss 1221 can provide good structural reinforcement to the pole column body 122, thereby increasing the overall structural strength of the pole column 12. Since the first slope 12211 is formed on the connecting boss 1221, the connecting boss 1221 can better receive the force acting when connecting and fixing the tab 132 to the first slope 12211, thereby enabling stable welding and fixing of the tab 132 to the first slope 12211.

[0137] In one embodiment of this application, as shown in Figure 4, at least a portion of the surface of the connection boss 1221 opposite to the electrode assembly 13 in the axial direction (up and down direction shown in Figure 3) of the connection hole 1223 may be formed as a first bevel 12211.

[0138] At least a portion of the surface of the connecting boss 1221 opposite to the electrode assembly 13 is formed as a first bevel 12211, that is, the surface of the connecting boss 1221 opposite to the electrode assembly 13 may be formed as a first bevel 12211, and a portion of the surface of the connecting boss 1221 opposite to the electrode assembly 13 may also be formed as a first bevel 12211, for example, a portion of the surface of the connecting boss 1221 opposite to the electrode assembly 13 may be formed as a first bevel, and another portion may be formed as a flat surface, a curved surface, a folded surface, etc.

[0139] In this embodiment, by positioning the first inclined surface 12211 on the opposite side of the electrode assembly 13 of the connecting boss 1221, the connecting boss 1221 can provide a certain shielding effect between the tab 132 and the electrode assembly 13 in the connecting hole 1223. When the tab 132 is welded to the first inclined surface 12211, the influence and effect on the electrode assembly 13 can be reduced, thereby improving the stability of the electrode assembly 13 during assembly. Furthermore, the connecting boss 1221 can provide a certain sealing effect with respect to the pole 12, thereby further improving the stability of the battery cell 10.

[0140] In some examples of this application, as shown in Figures 3 and 4, the first bevel 12211 may have a weld area, the tab 132 is welded to the weld area, the thickness of the connecting boss 1221 at the weld area position in the axial direction of the connecting hole 1223 is a first thickness, the depth of the molten pool formed at the weld area position of the connecting boss 1221 when the tab 132 and the connecting boss 1221 are welded is a first depth, and the first thickness is greater than the first depth.

[0141] The welding area is the area where the tab 132 is welded to the first bevel 12211. When welding the tab 132 to the first bevel 12211, the welding apparatus rapidly melts the tab 132 and the first bevel 12211 within the welding area and causes evaporation and solidification, thereby connecting and fixing the tab 132 to the first bevel 12211. The thickness of the connecting boss 1221 at the welding area position is the thickness in the axial direction of the connecting hole 1223 at the welding area position of the connecting boss 1221. The depth of the molten pool is the distance between the deepest point of the molten part of the base material and the surface of the base material. In this embodiment, the depth of the molten pool is the dimension to which the welding area of ​​the connecting boss 1221 melts in the axial direction of the connecting hole 1223. As shown in Figure 3, h1 in the drawing represents the first thickness and h2 represents the first depth.

[0142] In this embodiment, by setting the first thickness to be greater than the first depth, when welding the tab 132 to the first slope 12211, melt-through occurs in the connecting boss 1221, allowing the connecting boss 1221 to maintain good structural strength and a stable connection and fixing effect with the tab 132. This reduces the possibility of slag generated after melt-through of the connecting boss 1221 falling onto the electrode assembly 13, and reduces the possibility of high temperatures during welding being transmitted to the electrode assembly 13 and damaging it. As a result, the welding work between the tab 132 and the electrode column 12 can be performed reliably and stably, and the battery 10 cells maintain good quality.

[0143] In one example of this application, the difference between the first thickness and the first depth may be 0.2 mm or more.

[0144] In this embodiment, the difference between the first thickness and the first depth is set to 0.2 mm or more. For example, the difference between the first thickness and the first depth may be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, etc.

[0145] In this embodiment, by setting the difference between the first thickness and the first depth to 0.5 mm or more, when welding the connecting boss 1221 to the tab 132, the welding device can stably and reliably weld the tab 132 and the first bevel 12211, and reliably reduce the possibility of burn-through occurring on the connecting boss 1221, thereby improving the stability of the battery cell 10 during assembly.

[0146] In some specific embodiments of this application, the difference between the first thickness and the first depth may be 0.5 mm or more.

[0147] In this embodiment, the difference between the first thickness and the first depth is set to 0.5 mm or more. For example, the difference between the first thickness and the first depth may be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, etc.

[0148] In this embodiment, by further limiting the difference between the first thickness and the first depth, the possibility of burn-through occurring at the connecting boss 1221 when the welding apparatus performs welding work on the tab 132 and the first bevel 12211 can be better reduced, and the structure can be made more stable and reliable when assembling and welding the battery cell 10.

[0149] In some examples of this application, as shown in Figure 4, the first inclined surface 12211 may be connected by an arc to the surface of the connecting boss 1221 facing the electrode assembly 13.

[0150] Specifically, as shown in Figures 3 and 4, the side of the first bevel 12211 facing the electrode assembly 13 may be connected by an arc to the surface of the connecting boss 1221 facing the electrode assembly 13, and the arc may be a half arc, a quarter arc, etc., and the radius of the arc may be set reasonably according to the requirements for the welded connection between the tab 132 and the first bevel 12211. When the tab 132 is fitted and fixed to the first inclined surface 12211, the portion of the tab 132 facing the electrode assembly 13 of the pole column 12 and the portion of the tab 132 inserted into the connection hole 1223 sandwich the connection boss 1221. The side of the tab 132 facing the first inclined surface 12211 and the side of the tab 132 facing the connection boss 1221 form an angle, and the portion of the first inclined surface 12211 that connects with the surface of the connection boss 1221 on the side facing the electrode assembly 13 is located at the angle formed by the tab 132.

[0151] In this embodiment, by connecting the first bevel surface 12211 and the surface of the connecting boss 1221 facing the electrode assembly 13 with an arc, the transition between the first bevel surface 12211 and the surface of the connecting boss 1221 facing the motor assembly can be made smoother, thereby reducing the possibility of damaging the tab 132 when fitting and fixing it to the first bevel surface 12211, and the position where it is connected by an arc can provide a certain clearance space for the tab 132 to bend toward the first bevel surface 12211, allowing the tab 132 to be more stable and securely adhere to the first bevel surface 12211, thereby improving the welding effect when welding the tab 132 and the first bevel surface 12211.

[0152] In one embodiment of this application, as shown in Figure 4, the surface of the connecting boss 1221 facing the electrode assembly 13 may be flush with the surface of the pole column body 122 facing the electrode assembly 13.

[0153] As shown in Figure 4, an opening for a connection hole 1223 is formed on the surface of the pole post body 122 facing the electrode assembly 13, and the surface of the connection boss 1221 facing the electrode assembly 13 is flush with the surface of the pole post body 122 facing the electrode assembly 13, and together with the surface of the pole post body 122 facing the electrode assembly 13, it forms the opening for the connection hole 1223. The distance between the surface of the connection boss 1221 facing the electrode assembly 13 and the electrode assembly 13 is the same as the distance between the surface of the pole post body 122 facing the electrode assembly 13 and the electrode assembly 13. The tab 132 pulled out from the side of the electrode assembly 13 facing the pole post body 122 is inserted into the connection hole 1223 through the opening and fitted and fixed with the first inclined surface 12211 of the connection boss 1221.

[0154] In this embodiment, by making the surface of the connection boss 1221 facing the electrode assembly 13 flush with the surface of the pole column body 122 facing the electrode assembly 13, the entire connection boss 1221 is placed within the space enclosed by the inner wall of the pole column body 122, thereby reducing the further space occupied by the connection boss 1221 in the battery cell 10, which is somewhat advantageous in improving the energy density of the battery cell 10. Furthermore, by forming only the opening structure of the connection hole 1223 on the surface of the pole column 12 facing the electrode assembly 13, the tab 132 can be freely and stably positioned at the opening of the connection hole 1223 and inserted into the connection hole 1223 from the opening and fitted and fixed to the first inclined surface 12211, thus easily assembling the tab 132 to the pole column 12.

[0155] In one embodiment of this application, the minimum width of the connecting hole 1223 may be 3 mm or more.

[0156] The width of the connection hole 1223 is the radial width of the pole column 12. Since the first inclined surface 12211 is formed as part of the inner wall of the connection hole 1223, the first inclined surface 12211 extends outward along the radial direction of the pole column 12, in the direction away from the electrode assembly 13, from the side of the pole column body 122 facing the electrode assembly 13. The width of the connection hole 1223 gradually increases in the direction away from the electrode assembly 13 along the axial direction of the connection hole 1223. In other words, the minimum width of the connection hole 1223 is the width of the opening formed by the side of the pole column body 122 facing the electrode assembly 13 and the connection boss 1221. When welding the tab 132 to the pole column 12, the tab 132 must be inserted into the connection hole 1223 from the opening position having the minimum width of the connection hole 1223 and fitted and fixed to the first inclined surface 12211. As shown in Figure 4, L3 in the drawing represents the minimum width of the connection hole 1223. For example, the minimum width L3 of the connection hole 1223 may be 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, etc.

[0157] In this embodiment, by making the minimum width of the connection hole 1223 3 mm or more, the tab 132 can be easily and reliably inserted into the connection hole 1223 from the opening and fitted and fixed to the first inclined surface 12211, making the connection and fixing of the tab 132 to the pole column 12 convenient and easy.

[0158] In one embodiment of this application, the ratio of the minimum width of the connecting hole 1223 to the thickness of the tab 132 may be 1.5 to 5.

[0159] The thickness of tab 132 is the distance between the surface of tab 132 that is bonded to the first bevel 12211 and the surface of tab 132 opposite to the first bevel 12211. For example, the ratio of the minimum width of the connecting hole 1223 to the thickness of tab 132 may be 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc.

[0160] In this embodiment, by limiting the ratio of the minimum width of the connection hole 1223 to the thickness of the tab 132 to 1.5 to 5, the connection hole 1223 is given a larger minimum width, making it easier to insert the tab 132. As can be seen, the connection hole 1223 is formed by the inner wall of the pole column body 122 and the first bevel surface 12211 of the connection boss 1221, and by limiting the ratio of the minimum width of the connection hole 1223 to the thickness of the tab 132 to 1.5 to 5, the first bevel surface 12211 on the connection boss 1221 is given sufficient length, making it easier to weld and fix the tab 132, thereby ensuring a good fit between the tab 132 and the first bevel surface 12211 when welding the tab 132 to the pole column 12.

[0161] In some examples of this application, the ratio of the minimum width of the connecting hole 1223 to the thickness of the tab 132 may be 2.5 to 5.

[0162] In this embodiment, the ratio of the minimum width of the connecting hole 1223 to the thickness of the tab 132 is limited to 2.5 to 5. For example, the ratio of the minimum width of the connecting hole 1223 to the thickness of the tab 132 may be 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5, etc.

[0163] In this embodiment, by further limiting the ratio of the minimum width of the connection hole 1223 to the thickness of the tab 132 to 2.5 to 5, the possibility of the tab 132 being scratched by the wall of the connection hole 1223 when the tab 132 is inserted can be better reduced, and the tab 132 can be easily and reliably inserted into the connection hole 1223 from the opening position of the minimum width of the connection hole 1223 and fitted and fixed to the first inclined surface 12211.

[0164] In one embodiment of this application, the ratio of the minimum width of the connecting hole 1223 to the maximum width of the connecting hole 1223 may be 0.3 to 0.5.

[0165] The maximum width of the connection hole 1223 is the maximum radial width dimension of the pole column 12 of the connection hole 1223. As shown in Figure 4, L4 in the drawing is approximately the maximum width of the connection hole 1223, and the maximum width of the connection hole 1223 may be formed at the opening opposite the electrode assembly 13 of the connection hole 1223. The ratio of the minimum width of the connection hole 1223 to the maximum width of the connection hole 1223 may be 0.3, 0.35, 0.4, 0.45, 0.5, etc., and is 0.5 or less. In other words, the opening at one end of the connection hole 1223 facing the electrode assembly 13 should be smaller than half the opening at the other end of the connection hole 1223 opposite the electrode assembly 13.

[0166] In this embodiment, by limiting the ratio of the minimum width of the connection hole 1223 to the maximum width of the connection hole 1223, the overall width of the connection hole 1223 can be easily determined and manufactured based on the width dimension required for the opening on the side of the connection hole 1223 facing the electrode assembly 13, thereby simplifying the design and manufacturing of the pole pole 12.

[0167] In this embodiment, by limiting the ratio of the minimum width to the maximum width of the connection hole 1223 to between 0.3 and 0.5, the tab 132 can be easily and reliably inserted into the connection hole 1223 from the opening at the minimum width position and connected and fixed to the first inclined surface 12211. The first inclined surface 12211 formed on the connection boss 1221 inside the connection hole 1223 better satisfies the need to connect and fix the tab 132 while maintaining or reducing the height dimension of the original pole column 12, and a small opening structure can be provided at the opening at the minimum width position. As a result, a weak communication between the case 11 housing cavity 112 and the external environment can be maintained to some extent by the connection hole 1223, and the pole column 12 provides a certain sealing effect on the battery cell 10.

[0168] In some examples of this application, the ratio of the minimum width of the connecting hole 1223 to the maximum width of the connecting hole 1223 may be 0.35 to 0.45.

[0169] For example, the ratio of the minimum width to the maximum width of the connection hole 1223 may be 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, etc.

[0170] In this embodiment, by further limiting the ratio of the minimum width to the maximum width of the connection hole 1223, the tab 132 can be easily inserted into the connection hole 1223, and the first inclined surface 12211 can be better and more securely fitted and connected to the tab 132, thereby improving and reducing the overall height dimension of the pole column 12, which is advantageous for improving the energy density of the battery cell 10.

[0171] In one embodiment of the present application, as shown in Figures 3 and 4, the pole column 12 may further include a first ring 121 and a second ring 123. The first ring 121 is connected to one end of the pole column body 122 facing the electrode assembly 13, and extends outward along the radial direction of the pole column body 122 and extends annularly along the circumferential direction of the pole column body 122. The second ring 123 is connected to the other end of the pole column body 122 opposite to the electrode assembly 13, and extends outward along the radial direction of the pole column body 122 and extends annularly along the circumferential direction of the pole column body 122.

[0172] The surface of the first ring 121 facing the electrode assembly 13 may be provided to be flush with the surface of the pole post body 122 facing the electrode assembly 13, the shape of the first ring 121 may match the shape of the pole post body 122, the first ring 121 and the pole post body 122 may be provided separately or integrally molded, the material of the first ring 121 may be the same as or different from the material of the pole post body 122, the thickness of the first ring 121 in the axial direction of the pole post body 122 may be set reasonably according to the requirements of mounting and assembling the pole post 12, and optionally, one end of the first ring 121 facing the electrode assembly 13 of the pole post body 122 may be flanged outward along the radial direction of the pole post body 122.

[0173] The surface of the second ring 123 facing the electrode assembly 13 may be provided to be flush with the surface of the pole post body 122 opposite to the electrode assembly 13, the shape of the second ring 123 may match the shape of the pole post body 122, the second ring 123 and the pole post body 122 may be provided separately or integrally molded, the material of the second ring 123 may be the same as or different from the material of the pole post body 122, the thickness of the second ring 123 in the axial direction of the pole post body 122 may be reasonably set according to the requirements of mounting and assembling the pole post 12, and optionally, the second ring 123 may have one end of the pole post body 122 opposite to the electrode assembly 13 formed outward along the radial direction of the pole post body 122 by flange processing.

[0174] In this embodiment, a first ring 121 and a second ring 123 are provided at both ends of the pole post body 122, respectively. The first ring 121 and the second ring 123 can improve the structural strength of the pole post body 122 to some extent, thereby improving the overall structural strength of the pole post 12. This makes the connection and fixing between the pole post 12 and the tab 132 more stable and reliable, allowing the pole post 12 to participate more effectively in the electrical energy transport operation of the battery cell 10. The first ring 121 and the second ring 123 can form a locking groove structure together with the pole post body 122, thereby facilitating the attachment and fixing of the pole post 12 to the battery cell 10. The structure of the first ring 121 and the second ring 123 is simple and easy to use.

[0175] In some embodiments of this application, as shown in Figure 3, the battery cell 10 may further include a mating block 14, the mating block 14 being located within a connection hole 1223, and the tab 132 abutting between the mating block 14 and the first inclined surface 12211.

[0176] The shape of the fitting block 14 may match the connection hole 1223 and the first inclined surface 12211, the fitting block 14 may be manufactured from the same material as the pole column 12, the fitting block 14 may be fixedly connected to the pole column body 122, or the fitting block 14 may be fixedly connected to the pole column body 122 and the tab 132. When welding the tab 132 and the pole column 12, the fitting block 14 is placed inside the connection hole 1223, and the surface of the fitting block 14 facing the first inclined surface 12211 works in conjunction with the first inclined surface 12211 to sandwich and fix the tab 132.

[0177] In this embodiment, a fitting block 14 is provided inside the connection hole 1223 to sandwich and fix the tab 132 in place in conjunction with the first inclined surface 12211. As a result, the tab 132 can be stably contacted and fixed on the first inclined surface 12211 under the action of the fitting block 14 and maintain a good contact state, thereby facilitating welding of the tab 132 to the pole column 12. The fitting block 14 is installed inside the connection hole 1223 and can further reinforce the structure of the pole column 12. At the same time, the fitting block 14 can provide a certain shielding effect to the opening at one end of the connection hole 1223 facing the electrode assembly 13, thereby providing a certain sealing effect to the pole column 12, reducing the possibility of electrolyte leakage from the battery cell 10 in the connection hole 1223 of the pole column 12, and giving the battery cell 10 good stability.

[0178] In one embodiment of this application, as shown in Figures 3 and 6, the fitting block 14 has a second inclined surface 141 parallel to the first inclined surface 12211, and the tab 132 may abut between the first inclined surface 12211 and the second inclined surface 141.

[0179] The second inclined surface 141 may be a plane or a curved surface, and in the axial direction of the pole column 12, one end of the second inclined surface 141 facing the electrode assembly 13 may be flush with one end of the first inclined surface 12211 facing the electrode assembly 13, and the other end of the second inclined surface 141 opposite to the electrode assembly 13 may be flush with the other end of the first inclined surface 12211 opposite to the electrode assembly 13, or may be within the extension range of the first inclined surface 12211. Selectively, in this embodiment, both the second inclined surface 141 and the first inclined surface 12211 are planes.

[0180] A second inclined surface 141 parallel to the first inclined surface 12211 is provided on the fitting block 14, and the distance between the first inclined surface 12211 and the second inclined surface 141 in the extending direction perpendicular to the first inclined surface 12211 can always be kept the same. As a result, when the tab 132 is welded to the pole column 12, the combined pressing action of the second inclined surface 141 and the first inclined surface 12211 allows the portion of the tab 132 that falls onto the first inclined surface 12211 to maintain a state of being fixed in close proximity to the first inclined surface 12211 in the extending direction of the first inclined surface 12211. This allows the tab 132 to be welded to the first inclined surface 12211 more easily and stably, and the fitting block 14 can stably and reliably hold and fix the tab 132 through the cooperation of the second inclined surface 141 and the first inclined surface 12211.

[0181] In some examples of this application, as shown in Figure 3, the end face of one end of the fitting block 14 facing the electrode assembly 13 in the axial direction of the connection hole 1223 may abut against the electrode assembly 13.

[0182] The end face of one end of the mating block 14 facing the electrode assembly 13 abuts against the electrode assembly 13. Specifically, the end face of the mating block 14 facing the electrode assembly 13 may be flush with the end face of the pole body 122 facing the electrode assembly 13. When assembling the battery cell 10, the end of the mating block 14 facing the electrode assembly 13 abuts against the electrode assembly 13 together with the end of the pole body 122 facing the electrode assembly 13. A portion of one end of the tab 132 pulled out from the end of the electrode assembly 13 facing the pole 12 is inserted into the connection hole 1223 and sandwiched between the first inclined surface 12211 and the second inclined surface 141.

[0183] In this embodiment, by bringing the fitting block 14 into contact with the electrode assembly 13, it can perform a restrictive and fixing action on the electrode assembly 13 and the tab 132 in the axial direction of the pole column 12, and can also perform a certain pressing action on the tab 132, allowing the tab 132 to be inserted more stably into the connection hole 1223, and allowing the electrode assembly 13 to be more firmly positioned inside the battery cell 10 after assembly.

[0184] In one example of this application, the fitting block 14 may be welded to the pole column 12.

[0185] The mating block 14 and the pole column 12 are welded together, and for example, the tab 132 and the pole column 12 may be welded and fixed together by a welding method such as ultrasonic welding, laser welding, or resistance thermal fusion welding.

[0186] In this embodiment, the fitting block 14 and the pole column 12 are fixed by welding, making the connection easy and reliable. The fitting block 14 can stably and reliably engage with the connecting boss 1221 and fix the tab 132 in between, thereby making the connection between the tab 132 and the pole column 12 more stable and easier.

[0187] In some examples of this application, as shown in Figure 9, a support projection 1222 may be formed on the circumferential wall of the connection hole 1223, the support projection 1222 is spaced apart from the first inclined surface 12211 in the circumferential direction of the connection hole 1223, and one end of the fitting block 14 is supported by the support projection 1222.

[0188] Support projections 1222 are formed on the peripheral wall of the connection hole 1223. Specifically, the support projections 1222 may be arc-shaped, rectangular, polygonal, etc., and may extend inward along the radial direction of the connection hole 1223. As shown in Figure 9, the surface of the support projection 1222 facing the electrode assembly 13 in the axial direction of the connection hole 1223 may be set to be flush with the surface of the pole column body 122 facing the electrode assembly 13. The surface of the support projection 1222 opposite to the electrode assembly 13 can support and fix the end of the fitting block 14 in the radial direction of the connection hole 1223. The surface of the support projection 1222 that supports and contacts the fitting block 14 may be set according to the shape of the surface of the fitting block 14 facing the electrode assembly 13 in order to support and fix the fitting block 14.

[0189] In this embodiment, the support projection 1222 and the first inclined surface 12211 are spaced apart in the circumferential direction of the connection hole 1223. That is, one end of the support projection 1222 facing the first inclined surface 12211 and the other end of the first inclined surface 12211 facing the support projection 1222 are spaced apart in the radial direction of the connection hole 1223. When assembling, the tab 132 can be inserted into the connection hole 1223 from the space defined in the radial direction of the connection hole 1223 by the support projection 1222 and the first inclined surface 12211. The fitting block 14 is placed in the connection hole 1223, and the tab 132 is pressed toward the first inclined surface 12211 to fix it in place, and one end of the fitting block 14 is fitted and fixed to the support projection 1222.

[0190] In this embodiment, a support projection 1222 is provided inside the connection hole 1223 to support and fix the fitting block 14. When assembling the fitting block 14 to the pole column 12, the support boss provides good support and limiting to the fitting block 14, reducing the possibility of the fitting block 14 pressing too hard against the first inclined surface 12211. This allows the fitting block 14 and the first inclined surface 12211 to cooperate better to sandwich and fix the tab 132. The support projection 1222 further improves the structural strength of the pole column 12 to some extent, thereby improving the structural stability of the pole column 12.

[0191] In one example of this application, as shown in Figure 9, the surface of the support projection 1222 facing the electrode assembly 13 may be connected by an arc to the surface of the support projection 1222 facing the first inclined surface 12211.

[0192] The surface of the support projection 1222 facing the electrode assembly 13 is connected by an arc to the surface of the support projection 1222 facing the first inclined surface 12211, the arc may be a half arc, a quarter arc, etc., and the radius of the arc may be set reasonably according to the need for the tab 132 to be inserted into the connection hole 1223 and the need to fix the fitting block 14 and the support projection 1222.

[0193] In this embodiment, the surface of the support projection 1222 facing the electrode assembly 13 is connected by an arc to the surface of the support projection 1222 facing the first inclined surface 12211, thereby reducing scratches that occur when the tab 132 is inserted into the connection hole 1223 from between the support projection 1222 and the connection boss 1221, and allowing the tab 132 to be easily and conveniently connected and assembled to the pole column 12.

[0194] In one example of this application, as shown in Figures 3 and 9, the angle between the first inclined surface 12211 and the second inclined surface 141 and the first plane perpendicular to the axis of the connecting hole 1223 may be between 0° and 60°.

[0195] For example, the angle between the first inclined surface 12211 and the second inclined surface 141 and the first plane perpendicular to the axis of the connecting hole 1223 may be 10°, 20°, 30°, 40°, 50°, 60°, etc.

[0196] In this embodiment, by limiting the angle between the first inclined surface 12211 and the second inclined surface 141 and the first plane perpendicular to the axis of the connection hole 1223 to between 0° and 60°, acute angles are formed within a small range for the angle between the first inclined surface 12211 and the first plane, and the angle between the second inclined surface 141 and the first plane. As a result, the first inclined surface 12211 and the second inclined surface 141 are gently inclined in the radial direction of the connection hole 1223. When welding the tab 132 and the pole column 12, the welding direction of the welding device is perpendicular to the extending direction of the first inclined surface 12211 and the second inclined surface 141. Therefore, the welding device can be inserted into the connection hole 1223 at a small angle to perform the welding work. This better reduces interference between the hole wall of the connection hole 1223 and the welding device, jigs, etc., making the welding and fixing of the tab 132 and the pole column 12 convenient and easy.

[0197] In some specific embodiments of this application, the angle between the first inclined plane 12211 and the second inclined plane 141 and the first plane is between 0° and 20°.

[0198] For example, the angle between the first inclined plane 12211 and the second inclined plane 141 and the first plane perpendicular to the axis of the connecting hole 1223 may be 2°, 4°, 6°, 8°, 10°, 12°, 14°, 16°, 18°, etc.

[0199] In this embodiment, by further limiting the angle between the first bevel 12211 and the second bevel 141 and the first plane to between 0° and 20°, the first bevel 12211 and the second bevel 141 can extend more gently along the radial direction of the connection hole 1223, and the first bevel 12211 and the second bevel 141 can better face the opening of the connection hole 1223 on the opposite side of the electrode assembly 13, thereby allowing welding equipment, jigs, etc., to reach the welding position of the first bevel 12211 and the second bevel 141, which allows for easier, more convenient, and faster insertion of the first bevel 12211, making the welding and fixing of the tab 132 and the pole column 12 easier and more efficient.

[0200] In one example of this application, as shown in Figure 9, the other end of the fitting block 14 may extend to the other side wall facing the support projection 1222 of the connection hole 1223.

[0201] The other end of the fitting block 14 extends to the other side wall facing the support projection 1222 of the connection hole 1223. Specifically, in the radial direction of the connection hole 1223, one end of the fitting block 14 may extend to the side wall on the side where the support projection 1222 of the connection hole 1223 is formed, and the other end of the fitting block 14 may extend to the other side wall facing the support projection 1222 of the connection hole 1223.

[0202] In this embodiment, by extending the other end of the fitting block 14 to the other side wall of the connection hole 1223 facing the support projection 1222, the fitting block 14 and the support projection 1222 can be fitted together to provide a good seal to the connection hole 1223, and the end of the tab 132 inserted into the connection hole 1223 can be sealed between the first inclined surface 12211 and the second inclined surface 141, thereby significantly reducing the probability that the welded joint between the tab 132 and the first inclined surface 12211 will come into contact with the outside atmosphere through the connection hole 1223, making the electrical connection between the tab 132 and the pole column 12 more stable and reliable. The fitting block 14 can form a good contact and fixing effect with the side wall of the connection hole 1223, thereby allowing the fitting block 14 to provide a better structural reinforcement to the pole column 12, making the overall structure of the pole column 12 more stable and robust.

[0203] In some specific embodiments of this application, as shown in Figures 3 and 9, the fitting block 14, tab 132 and pole post 12 may be integrally welded together.

[0204] After assembling the fitting block 14 with the tab 132 and pole post 12, the fitting block 14 may be welded to the pole post body 122, the tab 132 may be welded to the connecting boss 1221 of the pole post 12, or the tab 132 may be welded to the fitting block 14 and the connecting boss 1221. When the fitting block 14 is welded to the tab 132 and the connecting boss 1221, the welding device can weld the fitting block 14, the tab 132 and the connecting boss 1221 from the opposite side of the fitting block 14 from the tab 132, and the fitting block 14 and the tab 132 and connecting boss 1221 may be welded together with a single weld bead.

[0205] In this embodiment, by welding the fitting block 14 integrally with the tab 132 and the pole column 12, the connection and fixing between the fitting block 14, the tab 132 and the pole column 12 is made stronger and more secure, and the fitting block 14 and the pole column 12 can be firmly fixed by the tab 132.

[0206] In one embodiment of this application, the material of the fitting block 14 may be the same as the material of the pole column 12.

[0207] For example, if the pole post 12 is made of copper, the fitting block 14 may also be made of copper, and if the pole post 12 is made of an aluminum alloy, the fitting block 14 may also be made of an aluminum alloy or the like.

[0208] In this embodiment, by making the material of the fitting block 14 the same as the material of the pole column 12, the welding and fixing of the fitting block 14 and the pole column 12 can be made easier, the welding can be made stronger, and the welding effect can be improved.

[0209] In some embodiments of this application, as shown in Figure 3, the active material coating 131 includes a current collector and an active material layer provided on the current collector, and the tab 132 is electrically connected to the current collector, and the tab 132 includes a plurality of tab sheets, the tab sheets near the current collector are bundled together to form a first throttling portion 1321, and the tab sheets farther from the current collector are bundled together and connected to form a second throttling portion 1322, the first throttling portion 1321 is connected to the second throttling portion 1322 and the active material coating 131, and at least a portion of the second throttling portion 1322 is inserted into a connection hole 1223 and connected to a first inclined surface 12211.

[0210] Tab 132 includes multiple layers of tab sheets; for example, the tab sheets may have 3, 4, 5, 6, 7, 8 layers, or the like.

[0211] Tab 132 is drawn out from the current collector, and as shown in Figure 3, the multiple tab sheets are narrowed and bundled from the surface of the active material coating portion 131 facing the pole column 12 toward the connection hole 1223 of the pole column 12. The distance between the multiple tab sheets gradually decreases until they are stacked and in close contact with each other. During the processing of tab 132, the stacked and in close contact portion of tab 132 is tack-welded to form a second narrowed portion 1322. In the direction from the active material coating portion 131 toward the pole column 12, the portion with a constant distance between the multiple tab sheets and the portion of the stacked and in close contact portion of tab 132 that is not tack-welded form a first narrowed portion 1321.

[0212] When welding and fixing the tab 132 to the pole column 12, the second constricted portion 1322 of the tab 132 may be partially inserted into the connection hole 1223 and connected and fixed to the first slope 12211, or the entire second constricted portion 1322 of the tab 132 may be inserted into the connection hole 1223 and connected and fixed to the first slope 12211.

[0213] In this embodiment, by bundling multiple tab sheets together to form a tab 132, when welding and fixing the tab 132 to the pole column 12, the multiple tab sheets and the pole column 12 can be easily and reliably connected and fixed via the second constricted portion 1322, and the second constricted portion 1322 can be made to have a small thickness, thereby allowing the tab 132 to be inserted into the connection hole 1223 more easily and conveniently and bonded to the first inclined surface 12211 for fixation.

[0214] Selectively, the connection position between the first diaphragm 1321 and the second diaphragm 1322 may be set to correspond to the opening of the connection hole 1223 on the side facing the electrode assembly 13. That is, in a projection plane perpendicular to the axial direction of the pole column 12, the projection of the connection position between the first diaphragm 1321 and the second diaphragm 1322 onto the projection plane is located within the projection range of one side of the opening of the connection hole 1223, and when the tab 132 and the pole column 12 are connected and assembled, the second diaphragm 1322 is inserted into the connection hole 1223 from the opening side of the connection hole 1223 and connected and fixed to the pole column 12.

[0215] In this way, the second aperture portion 1322 can be inserted into the connection hole 1223 for a short distance, thereby reducing the excess portion of the tab 132, lowering costs, and improving the energy density of the battery cell 10 to some extent.

[0216] In one embodiment of this application, as shown in Figures 3 and 9, at least a portion of the first constricted portion 1321 can be inserted into the connecting hole 1223 and extend along the first inclined surface 12211.

[0217] At least a portion of the first aperture portion 1321 is inserted into the connection hole 1223 and extends along the first inclined surface 12211, that is, the first aperture portion 1321 may be partially inserted into the connection hole 1223, or the first aperture portion 1321 may be entirely inserted into the connection hole 1223.

[0218] In this embodiment, by inserting at least a portion of the first constricted portion 1321 into the connection hole 1223 and extending it along the first inclined surface 12211, the tab 132 and the first inclined surface 12211 can be given a longer contact fixing dimension, thereby making the connection and fixing of the tab 132 and the first inclined surface 12211 more stable and reliable, allowing the tab 132 to occupy less space within the case 11, thereby increasing the dimensions of the active material coating portion 131 and improving the energy density of the battery cell 10, and further reducing the excess portion of the tab 132 within the case 11, thereby further reducing the probability of a short circuit occurring between the tab 132 and the active material coating portion 131, and thereby making the use of the battery cell 10 more stable and reliable.

[0219] In one embodiment of this application, the ratio of the overlap width between the first inclined surface 12211 of the second constricted portion 1322 and the first inclined surface 12211 to the width of the first inclined surface 12211 is 0.5 or more.

[0220] The overlap width between the second diaphragm 1322 and the first inclined surface 12211 is the length dimension of the second diaphragm 1322 extending along the first inclined surface 12211, and the width of the first inclined surface 12211 is the length dimension of the first inclined surface 12211 extending in the axial direction of the pole column 12. As shown in Figures 4 and 5, L5 in Figure 4 represents the width of the first inclined surface 12211, and L6 in Figure 5 represents the overlap width. The ratio of the overlap width of the second diaphragm 1322 on the first inclined surface 12211 to the width of the first inclined surface 12211 is 0.5 or greater, and may be, for example, 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc.

[0221] In this embodiment, by limiting the ratio of the overlap width between the second diaphragm 1322 and the first inclined surface 12211 to 0.5 or more, a sufficient overlap length can be provided between the second diaphragm 1322 and the first inclined surface 12211, thereby stabilizing and strengthening the connection between the second diaphragm 1322 and the first inclined surface 12211, and thereby stabilizing and strengthening the connection and fixing between the tab 132 and the pole column 12.

[0222] In some examples of this application, the ratio of the overlap width between the second diaphragm 1322 and the first inclined surface 12211 to the width of the first inclined surface 12211 is 0.8 to 1.2.

[0223] The ratio of the overlap width between the second constricted portion 1322 and the first inclined surface 12211 to the width of the first inclined surface 12211 is 0.8 to 1.2, and may be, for example, 0.8, 0.9, 1, 1.1, 1.2, etc.

[0224] In this embodiment, by further limiting the ratio of the overlap width between the second aperture portion 1322 and the first inclined surface 12211 to the width of the first inclined surface 12211, the second aperture portion 1322 can be better overlapped and fitted to the first inclined surface 12211, the second aperture portion 1322 can maintain a large overlap surface and overlap length with the first inclined surface 12211, the connection and fixing between the tab 132 and the pole column 12 can be made more stable and robust, and the excess portion dimensions of the first inclined surface 12211 or the second aperture portion 1322 can be reduced, the second aperture portion 1322 and the first inclined surface 12211 can be more easily fitted and brought into contact, thereby reducing to some extent the space occupied by the tab 132 and the pole column 12 in the battery cell 10.

[0225] In one embodiment of this application, the multiple tab sheets of the tab 132 may be connected by tack welding at the second constricted portion 1322.

[0226] Before welding the tab 132 and pole column 12 together, the multiple layers of tab sheets are stacked and constricted to form a second constricted section 1322. The welding apparatus connects the multiple layers of tab sheets in the second constricted section 1322 toward the pole column 12 by tack welding them together. Optionally, the multiple tab sheets in the second constricted section 1322 may be welded together by ultrasonic tack welding.

[0227] To make it easier to understand, the tack weld width required for tack welding of multiple layers of tab sheets is small, and by tack welding the multiple tab sheets of tab 132 at the second constricted portion 1322, the dimensions of tab 132 can be shortened to some extent during the processing and manufacturing of tab 132, thereby making tab 132 shorter, and further shortening the height dimension of pole column 12 fitted and fixed to tab 132, thereby further improving the energy density of battery cell 10.

[0228] In this embodiment, by tack welding the second constricted portion 1322 of the tab 132, the interlayer gap can be reduced, and the multiple soft tab sheets form a sheet structure with a certain rigidity in the second constricted portion 1322. This makes it difficult for the second constricted portion 1322 of the tab 1322 to move or bend as a whole, and makes it difficult for it to move relative to or stretch. This increases the overall integrity of the second constricted portion 1322, allowing for more stable bending of the second constricted portion 1322 toward the first inclined surface 12211 or welding connection with the first inclined surface 12211. This significantly reduces the possibility of cracks occurring when welding the tab 132 to the pole column 12, and makes the welded fixation between the tab 132 and the pole column 12 more stable and reliable. Selectively, the multiple tab sheets may be connected and fixed in the second constricted portion 1322 by methods such as bonding with a conductive adhesive, which are not listed here.

[0229] In one embodiment of this application, the tack weld width of the second constricted portion 1322 may be 1.5 mm or more.

[0230] In this embodiment, the tack weld width of the second constricted portion 1322 is 1.5 mm or more, and may be, for example, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc.

[0231] In this embodiment, by making the tack weld width of the second constricted portion 1322 1.5 mm or more, the tack weld of the tab 132 can have a sufficient width dimension. As a result, when performing operations such as bending the tab 132 or contacting it with the first bevel surface 12211, the overall structural strength of the tab 132 at the tack weld is sufficient to resist stresses such as tensile deformation that occur in the tab 132, maintaining a good and stable structural state during the assembly of the tab 132, thereby making the welding and fixing work between the tab 132 and the pole column 12 more stable and smoother.

[0232] In some embodiments of this application, as shown in Figure 13, the battery cell 10 may further include a cover plate 15 which is placed over one end of the connection hole 1223 opposite to the electrode assembly 13, and the cover plate 15 is sealed to the pole 12.

[0233] The cover plate 15 may be made of materials such as copper, zinc, aluminum, and copper-aluminum alloy, the shape of the cover plate 15 may conform to the cross-sectional shape of the connection hole 1223, and the thickness of the cover plate 15 may be set reasonably according to the requirements. When assembling the battery cell 10, after assembling the tab 132 to the pole post 12 and the mating block 14, the cover plate 15 should be installed on the end of the connection hole 1223 opposite to the electrode assembly 13.

[0234] In this embodiment, by installing the cover plate 15 so as to be sealed to the pole post 12, the fitting block 14 located in the connection hole 1223 and the tab 132 structure can be reliably sealed, and after welding the tab 132 and the pole post 12 to a fixed position, they can be positioned in a good sealed environment, thereby ensuring that the tab 132 and the pole post 12 are stably and well connected during long-term use, the cover plate 15 can transmit electricity in combination with the pole post 12, and the cover plate 15 can form a good electrical connection surface, thereby allowing the battery cell 10 to be easily connected to the electrical connection member when in use.

[0235] In one embodiment of this application, as shown in Figures 13 and 4, a groove 1224 may be formed on the surface of the pole column 12 opposite to the electrode assembly 13, the connection hole 1223 is formed inside the groove 1224 and penetrates the bottom wall of the groove 1224, and the cover plate 15 is provided inside the groove 1224.

[0236] The shape of the groove 1224 may match the shape and structure of the periphery of the cover plate 15, and the depth of the groove 1224 may match the thickness of the cover plate 15. The axis of the groove 1224 may be collinear with the axis of the connection hole 1223. When assembling the cover plate 15 and the pole column 12, the surface of the cover plate 15 facing the electrode assembly 13 abuts against the bottom of the groove 1224, and the periphery of the cover plate 15 abuts against the groove wall of the groove 1224.

[0237] In this embodiment, by installing a groove 1224 on the pole column 12, positioning is easy when fixing the cover plate 15 and the pole column 12, and the connection and fixing are stable and reliable.

[0238] In some examples of this application, as shown in Figures 13 and 4, the side walls of the groove 1224 may extend inclined outward along the radial direction of the connection hole 1223 in the direction from the electrode assembly 13 toward the cover plate 15.

[0239] The side walls of the groove 1224 extend outward inclined along the radial direction of the connection hole 1223, and the inclination angle of the side walls may be set reasonably according to the requirements for mounting and fixing the cover plate 15, the direction of extension of the side walls of the groove 1224 may be in line with the direction of extension of the periphery of the cover plate 15, and the side walls of the groove 1224 may abut against the periphery of the cover plate 15.

[0240] In this embodiment, by extending the side walls of the groove 1224 inclined outward along the radial direction of the connection hole 1223, a certain guiding action can be performed when assembling the cover plate 15 and the pole column 12, the cover plate 15 can be easily fixed in the groove 1224, resulting in a simple structure and easy assembly. When welding the cover plate 15 and the pole column 12 together, the periphery of the cover plate 15 and the inclined side walls of the groove 1224 improve the welding width during welding, enabling high welding quality between the cover plate 15 and the pole column 12, and allowing the cover plate 15 and the pole column 12 to have a good welded sealing effect.

[0241] In some examples of this application, as shown in Figures 13 and 4, the surface of the cover plate 15 opposite to the electrode assembly 13 and the end face of the pole column 12 opposite to the electrode assembly 13 may be flush.

[0242] After assembling the cover plate 15 and the pole column 12, the cover plate 15 can be combined with the pole column 12 to form a continuous plane on the side opposite to the electrode assembly 13 of the pole column 12. Specifically, the surface of the second ring 123 opposite to the electrode assembly 13 may be flush with the surface of the pole column 12 opposite to the electrode assembly 13 and the surface of the cover plate 15 opposite to the electrode assembly 13. The cover plate 15 may be bonded or welded to the pole column 12.

[0243] In this embodiment, by making the surface of the cover plate 15 opposite to the electrode assembly 13 flush with the end face of the pole column 12 opposite to the electrode assembly 13, a continuous plane can be formed when the cover plate 15 and the pole column 12 are combined. This reduces the space occupied by the cover plate 15 to some extent and increases the electrical connection surface between the battery cell 10 and the pole column 12. This improves the energy density of the battery cell 10 to some extent and allows the battery cell 10 to be easily electrically connected to the electrical connection member via the end of the pole column 12 opposite to the electrode assembly 13.

[0244] The manufacturing method for a battery cell 10 according to an embodiment of the second aspect of this application will be described below with reference to Figures 3 to 8, wherein the battery cell 10 is the battery cell 10 according to an embodiment of the first aspect of this application, and the manufacturing method includes the steps of inserting one end of the tab 132 into the connection hole 1223 of the pole column 12, bringing the surface on the thickness side of one end of the tab 132 into contact with the first inclined surface 12211, and welding one end of the tab 132 to the first inclined surface 12211.

[0245] One end of the tab 132 is the end opposite to the electrode assembly 13, i.e., the second constricted portion 1322 of the tab 132. The tab 132 is pulled out from the electrode assembly 13, and one end of the tab 132 extends inward toward the connection hole 1223 of the pole column 12 and is inserted into the connection hole 1223. The tab 132 is composed of multiple layers of tab sheets arranged in a stacked configuration. When the tab 132 is inserted into the connection hole 1223 and comes into contact with the first inclined surface 12211, the side surface of the tab sheet of the tab 132 in the stacking direction adheres to and comes into contact with the first inclined surface 12211. The first inclined surface 12211 is an inclined surface that slopes outward along the radial direction in the axial direction of the pole column 12. After being inserted into the connection hole 1223, the tab 132 is inclined toward and bent toward the first inclined surface 12211 and adheres to and comes into contact with the first inclined surface 12211.

[0246] In the manufacturing method of the battery cell 10 according to the embodiment of this application, the tab 132 is inserted into the connection hole 1223 of the pole post 12, abuts against the first inclined surface 12211, and is welded in place. This allows the tab 132 to occupy less space within the battery cell 10, reducing the weight of the tab 132 and the pole post 12, thereby significantly improving the energy density of the battery cell 10.

[0247] In some embodiments of this application, the step of bringing the thickness-direction surface of one end of the tab 132 into contact with the first bevel 12211 includes the step of inserting the fitting block 14 into the connecting hole 1223 and pressing the one end of the tab 132 against the first bevel 12211 with the fitting block 14 until it contacts the first bevel 12211.

[0248] When the mating block 14 is placed in the connecting hole 1223, one end of the tab 132 is between the second bevel 141 and the first bevel 12211 of the mating block 14, and as the mating block 14 moves toward the electrode assembly 13, the tab 132 is gradually bent inclined toward the first bevel 12211 under the pressing action of the second bevel 141, and finally comes into contact with the first bevel 12211.

[0249] In this embodiment, the fitting block 14 presses one end of the tab 132 against the first inclined surface 12211, thereby stably and reliably bonding and contacting the tab 132 with the first inclined surface 12211 under the action of the fitting block 14, and thereby the tab 132 can be easily and conveniently fixed in contact with the first inclined surface 12211.

[0250] In one embodiment of this application, the manufacturing method further includes the step of placing the cover plate 15 over the end of the connection hole 1223 opposite to the electrode assembly 13, and welding the cover plate 15 to the pole column 12.

[0251] A groove 1224 is formed at one end of the pole column 12 opposite to the electrode assembly 13. The cover plate 15 is assembled within the groove 1224 and placed over the connection hole 1223. After the cover plate 15 is assembled with the pole column 12, it is welded to the pole column 12.

[0252] In this embodiment, by placing the cover plate 15 over the end of the pole column 12 opposite to the electrode assembly 13 and welding it, the electrical connection surface of the pole column 12 can be enlarged and a sealing effect can be achieved between the electrode assembly 13 and the tab 132 inside the case 11, making it easier to connect the battery cell 10 to the electrical connection member during use and allowing the battery cell 10 to be used stably.

[0253] In some embodiments of this application, before inserting one end of the tab 132 into the connecting hole 1223 of the pole post 12, the manufacturing method further includes the step of joining together a plurality of tab sheets of the tab 132 by tack welding.

[0254] Multiple tab sheets can be stacked to form a tab 132, and the multiple tab sheets can be joined together using ultrasonic tack welding to form one end of the tab 132.

[0255] In this embodiment, by tack welding together multiple tab sheets of tab 132, the gaps between the tab sheets are reduced, making one end of tab 132 more compact, thereby facilitating subsequent operations such as inserting tab 132 into connection holes 1223.

[0256] The following describes a battery 100 according to an embodiment of the third aspect of this application, with reference to Figures 2 to 13.

[0257] As shown in Figures 2 to 13, the battery 100 according to the embodiment of this application includes a battery cell 10 according to the embodiment of the first aspect of this application.

[0258] Other configurations and operations of the battery 100 according to the embodiments of this application are known to those skilled in the art and will not be described in further detail here.

[0259] In the battery 100 according to the embodiment of this application, the battery cell 10 according to the embodiment of the first embodiment is installed, a connection hole 1223 is installed on the pole pole 12 and penetrates the pole pole 12, and at least a part of the inner wall of the connection hole 1223 is formed as a first inclined surface 12211, and one end of the tab 132 is inserted into the connection hole 1223 and fixedly connected to the first inclined surface 12211, so that the tab 132 occupies less space inside the battery cell 10, the weight of the tab 132 and the pole pole 12 can be reduced, and the energy density of the battery cell 10 can be improved accordingly.

[0260] Hereinafter, an electrical device 1000 according to an embodiment of the fourth aspect of this application will be described with reference to Figures 1 to 13.

[0261] As shown in Figures 1 to 13, the battery 100 according to the embodiment of this application includes the battery cell 10 according to the third embodiment of this application.

[0262] Other configurations and operations of the electrical device 1000 according to the embodiments of this application are known to those skilled in the art and will not be described in further detail here.

[0263] In the electrical device 1000 according to the embodiment of this application, the battery 100 according to the third embodiment described above is installed, a connection hole 1223 is provided on the pole pole 12 that penetrates the pole pole 12, and at least a part of the inner wall of the connection hole 1223 is formed as a first inclined surface 12211, and one end of the tab 132 is inserted into the connection hole 1223 and fixedly connected to the first inclined surface 12211, so that the tab 132 and the pole pole 12 occupy less space within the battery cell 10, the weight of the tab 132 and the pole pole 12 can be reduced, and thereby the energy density of the battery cell 10 can be improved.

[0264] Hereinafter, with reference to Figures 1 to 13, two specific embodiments of the electrical device 1000 of this application will be described.

[0265] Example 1

[0266] As shown in Figures 1 and 2, the electrical device 1000 according to the fourth aspect of this application is a vehicle, and the electrical device 1000 includes a battery 100 according to the second aspect of this application, the battery 100 being used to provide or store electrical energy.

[0267] As shown in Figures 3 to 8 and Figure 13, the battery 100 includes a case 11, electrode posts 12, a cover plate 15, a mating block 14, an electrode assembly 13, and electrode posts 12. The case 11 has a housing cavity 112 and mounting holes, two mounting holes provided and communicating with the housing cavity 112, the electrode assembly 13 is installed in the housing cavity 112, the electrode assembly 13 includes an electrode sheet and a separator, the electrode sheet has a current collector and an active material layer, the active material layer is applied to the current collector to form an active material coating portion 131 of the electrode assembly 13, the portion of the current collector not coated with the active material layer protrudes from the active material coating portion 131 to form a tab sheet, multiple tab sheets are provided, one end of multiple tab sheets facing the mounting holes is narrowed and bundled to form a tab 132, one end of the tab 132 facing the active material coating portion 131 forms a first narrowed portion 1321, and one end of the tab 132 facing the pole column 12 is stacked to form a second narrowed portion 1322, the tab 132 includes a positive electrode tab 132 and a negative electrode tab 132.

[0268] Two pole posts 12 are provided, and the pole posts 12 are arranged in a one-to-one correspondence with the mounting holes, and the pole posts 12 are installed so as to penetrate into the mounting holes. The pole column 12 includes a pole column body 122, a first ring 121, and a second ring 123. The pole column body 122 is a hollow annular structure. The first ring 121 is integrally molded with the pole column body 122 and located within the housing cavity 112. The first ring 121 is ring-shaped on the outer circumferential surface of the pole column body 122, with the surface facing the electrode assembly 13 being flush with the surface of the pole column body 122 facing the electrode assembly 13 and the other side abutting against the inner wall of the case 11. The second ring 123 is molded separately from the pole column body 122 and located outside the case 11. The second ring 123 is ring-shaped on the outer circumferential surface of the pole column body 122, with the surface opposite to the electrode assembly 13 being flush with the surface of the pole column body 122 opposite to the electrode assembly 13 and the other side abutting against the case 11.

[0269] A connecting boss 1221 is formed on the inner wall of the pole column 12, and together with the pole column body 122, the connecting boss 1221 forms a connecting hole 1223. The surface of the connecting boss 1221 facing the electrode assembly 13 is flush with the surfaces of the pole column 12 and the first ring 121 facing the electrode assembly 13. A first inclined surface 12211 is formed on the surface of the connecting boss 1221 opposite to the electrode assembly 13, and the first inclined surface 12211 extends inclined toward the inner wall surface of the pole column 12 from one end facing the electrode assembly 13 to the other end opposite to the electrode assembly 13.

[0270] The fitting block 14 is provided within the connection hole 1223 and has a second inclined surface 141 parallel to the first inclined surface 12211. The fitting block 14 and the connection boss 1221 are spaced apart in the radial direction of the connection hole 1223. The fitting block 14 abuts against the wall of the connection hole 1223, and one end of the tab 132 is inserted into the connection hole 1223 and fixed between the first inclined surface 12211 and the second inclined surface 141.

[0271] A groove 1224 is formed at one end of the pole column 12 opposite to the electrode assembly 13. A connection hole 1223 penetrates the bottom of the groove 1224, and the opening of the groove 1224 gradually widens, allowing the cover plate 15 to be placed inside the groove 1224 and cover the connection hole 1223.

[0272] When assembling the battery cell 10, multiple tab sheets in the electrode assembly 13 are formed integrally by tack welding, the electrode assembly 13 is placed in the housing cavity 112 of the case 11, the poles 12 are positioned so as to pass through the mounting holes and fixed to the case 11 via the first ring 121 and the second ring 123 and brought into contact with the electrode assembly 13, one end of the tab 132 is inserted into the connection hole 1223, the fitting block 14 is placed into the connection hole 1223 and moved toward the electrode assembly 13, the tab 132 is sandwiched between the first inclined surface 12211 and the second inclined surface 141 under the coordinated action of the fitting block 14 and the connection boss 1221, the welding device welds the tab 132, the poles 12 and the fitting block 14, and after welding is complete, the cover plate 15 is placed over the groove 1224 of the poles 12 and welded to the poles 12, thereby completing the assembly of the battery cell 10.

[0273] In the electrical device 1000 according to the embodiment of this application, a connection hole 1223 is provided on the pole pole 12, penetrating the pole pole 12, and at least a portion of the inner wall of the connection hole 1223 is formed as a first inclined surface 12211. One end of the tab 132 is inserted into the connection hole 1223 and fixedly connected to the first inclined surface 12211. As a result, the tab 132 occupies less space within the battery cell 10, the weight of the tab 132 and the pole pole 12 can be reduced, and the energy density of the battery cell 10 can be improved.

[0274] Example 2

[0275] As shown in Figures 9 to 12, the structure of this embodiment is almost the same as that of Embodiment 1, with the same parts using the same reference numerals. The differences are as follows: a support projection 1222 is formed on the inner wall of the connection hole 1223, facing the connection boss 1221 in the radial direction of the connection hole 1223, and the fitting block 14 is fixed on the support projection. The inclination angle of the first inclined surface 12211 is further limited to between 0° and 20°. In this way, a certain limiting effect can be achieved on the movement of the fitting block 14, reducing the probability of excessive pressing of the fitting block 14 against the tab 132, improving the fitting between the fitting block 14 and the tab 132 and pole column 12, and making the operation of the welding device more convenient and easier when welding the tab 132 and the tab 132 to the fitting block 14.

[0276] Finally, it should be noted that the above embodiments are merely for illustrative purposes and not limiting purposes. While the application has been described in detail with reference to the above embodiments, those skilled in the art should understand that it is still possible to modify the inventions described in the above embodiments or to replace some or all of their technical features with equivalent ones. Such modifications or replacements should not cause the essence of the corresponding inventions to deviate from the scope of the inventions in the embodiments of this application, and should all be included within the scope of the claims and specification of this application. In particular, unless there is a structural inconsistency, the technical features mentioned in each embodiment can be combined in any manner. This application is not limited to the specific embodiments disclosed herein and includes all technical solutions included in the claims. [Explanation of Symbols]

[0277] 10 battery cells, 11 cases, 111 first wall, 112 containment cavities, 12 pole column, 121 first ring, 122 pole column body, 1221 connecting boss, 12211 first inclined surface, 1222 support projection, 1223 connecting hole, 1224 recessed groove, 123 second ring, 13 electrode assembly, 131 active material coating, 132 tab, 1321 first aperture, 1322 second aperture, 14 interlocking blocks, 141 second slope, 15 cover plates, 20 cabinets, 201 first cabinet, 202 second cabinet, 100 batteries, 200 controllers, 300 motors, 1000 Electrical equipment.

Claims

1. It is a battery cell, Case (11) including the first wall (111), A pole column (12) installed on the first wall (111), wherein a connecting hole (1223) is formed through the pole column (12), and at least a portion of the inner circumferential wall of the connecting hole (1223) is formed as a first inclined surface (12211), and the first inclined surface (12211) is positioned at an inclination with respect to the axis of the connecting hole (1223), A battery cell comprising an electrode assembly (13) including an active material coating portion (131) and a tab (132), wherein the active material coating portion (131) is installed in the case (11), the tab (132) is electrically connected to the active material coating portion (131), and at least a portion of the tab (132) is inserted into the connection hole (1223) and connected to the first inclined surface (12211).

2. The battery cell according to claim 1, wherein the tab (132) is welded to the pole column (12).

3. The battery cell according to claim 1, wherein, in the direction from the electrode assembly (13) toward the pole column (12), the first inclined surface (12211) extends outward inclined along the radial direction of the connection hole (1223).

4. The angle between the first inclined surface (12211) and the first plane perpendicular to the axis of the connecting hole (1223) is 0° to 70°, or The battery cell according to any one of claims 1 to 3, wherein the angle between the first inclined plane (12211) and the first plane is 30° to 60°.

5. The battery cell according to any one of claims 1 to 4, wherein the pole column (12) includes a pole column (12) body, the pole column (12) body is hollow and annular, a protruding connection boss (1221) is provided on the inner wall surface of the pole column (12) body, the pole column (12) body together with the connection boss (1221) defines the connection hole (1223), and the first inclined surface (12211) is formed on the connection boss (1221).

6. The battery cell according to claim 5, wherein in the axial direction of the connection hole (1223), at least a portion of the surface of the connection boss (1221) opposite to the electrode assembly (13) is formed as the first bevel (12211).

7. The first slope (12211) has a welding area to which the tab (132) is welded. The battery cell according to claim 6, wherein, in the axial direction of the connection hole (1223), the thickness of the connection boss (1221) at the welding area position is a first thickness, and when the tab (132) and the connection boss (1221) are welded, the depth of the molten pool formed at the welding area position of the connection boss (1221) is a first depth, and the first thickness is greater than the first depth.

8. The battery cell according to claim 7, wherein the difference between the first thickness and the first depth is 0.2 mm or more.

9. The battery cell according to claim 8, wherein the difference between the first thickness and the first depth is 0.5 mm or more.

10. The battery cell according to any one of claims 6 to 9, wherein the first inclined surface (12211) is connected by an arc to the surface of the connecting boss (1221) facing the electrode assembly (13).

11. The battery cell according to any one of claims 6 to 10, wherein the surface of the connecting boss (1221) facing the electrode assembly (13) and the surface of the pole column (12) body facing the electrode assembly (13) are flush.

12. The battery cell according to any one of claims 6 to 11, wherein the minimum width of the connection hole (1223) is 3 mm or more.

13. The battery cell according to any one of claims 6 to 12, wherein the ratio of the minimum width of the connection hole (1223) to the thickness of the tab (132) is 1.5 to 5, or the ratio of the minimum width of the connection hole (1223) to the thickness of the tab (132) is 2.5 to 5.

14. The battery cell according to any one of claims 6 to 13, wherein the ratio of the minimum width of the connection hole (1223) to the maximum width of the connection hole (1223) is 0.3 to 0.5, or the ratio of the minimum width of the connection hole (1223) to the maximum width of the connection hole (1223) is 0.35 to 0.

45.

15. The pole column (12) is A first ring (121) is connected to one end of the pole column (12) body facing the electrode assembly (13), extends outward along the radial direction of the pole column (12) body, and extends in an annular manner along the circumferential direction of the pole column (12) body, A battery cell according to any one of claims 5 to 14, further comprising a second ring (123) connected to the other end of the pole column (12) body opposite to the electrode assembly (13), extending outward along the radial direction of the pole column (12) body and extending annularly along the circumferential direction of the pole column (12) body.

16. The battery cell according to any one of claims 1 to 15, further comprising a fitting block (14), the fitting block (14) being provided within the connection hole (1223), and the tab (132) abutting between the fitting block (14) and the first inclined surface (12211).

17. The battery cell according to claim 16, wherein the fitting block (14) has a second inclined surface (141) parallel to the first inclined surface (12211), and the tab (132) abuts between the first inclined surface (12211) and the second inclined surface (141).

18. The battery cell according to claim 17, wherein, in the axial direction of the connection hole (1223), the end face of one end of the fitting block (14) facing the electrode assembly (13) abuts against the electrode assembly (13).

19. The battery cell according to claim 18, wherein the fitting block (14) is welded to the pole column (12).

20. A support projection (1222) is formed on the peripheral wall of the connection hole (1223), the support projection (1222) and the first inclined surface (12211) are spaced apart in the circumferential direction of the connection hole (1223), and one end of the fitting block (14) is supported by the support projection (1222), as described in any one of claims 17 to 19.

21. The battery cell according to claim 20, wherein the angle between the first inclined surface (12211) and the second inclined surface (141) and the first plane perpendicular to the axis of the connection hole (1223) is between 0° and 60°.

22. The battery cell according to claim 21, wherein the angle between the first inclined plane (12211) and the second inclined plane (141) and the first plane is between 0° and 20°.

23. The battery cell according to any one of claims 20 to 22, wherein the other end of the fitting block (14) extends to the other side wall of the connection hole (1223) facing the support projection (1222).

24. The battery cell according to claim 23, wherein the fitting block (14), the tab (132), and the pole column (12) are integrally welded together.

25. The battery cell according to any one of claims 16 to 24, wherein the material of the fitting block (14) and the material of the pole column (12) are the same.

26. The battery cell according to any one of claims 1 to 25, wherein the active material coating portion (131) includes a current collector and an active material layer provided on the current collector, the tab (132) is electrically connected to the current collector, the tab (132) includes a plurality of tab (132) sheets, the tabs (132) sheets near the current collector are bundled together to form a first diaphragm (1321), the tabs (132) sheets far from the current collector are bundled together and connected to form a second diaphragm (1322), the first diaphragm (1321) is connected to the second diaphragm (1322) and the active material coating portion (131), and at least a portion of the second diaphragm (1322) is inserted into the connection hole (1223) and connected to the first inclined surface (12211).

27. The battery cell according to claim 26, wherein at least a portion of the first aperture portion (1321) is inserted into the connection hole (1223) and extends along the first inclined surface (12211).

28. The battery cell according to claim 26, wherein the ratio of the overlap width between the second aperture portion (1322) and the first inclined surface (12211) to the width of the first inclined surface (12211) is 0.5 or more.

29. The battery cell according to claim 28, wherein the ratio of the overlap width between the second aperture portion (1322) and the first inclined surface (12211) to the width of the first inclined surface (12211) is 0.8 to 1.

2.

30. The battery cell according to any one of claims 1 to 29, further comprising a cover plate (15), the cover plate (15) being fitted over one end of the connection hole (1223) opposite to the electrode assembly (13), and the cover plate (15) being sealed and connected to the electrode post (12).

31. A groove (1224) is formed on the surface of the pole column (12) opposite to the electrode assembly (13), the connection hole (1223) is formed inside the groove (1224) and penetrates the bottom wall of the groove (1224), and the cover plate (15) is provided inside the groove (1224), as described in claim 30.

32. The battery cell according to claim 31, wherein, in the direction from the electrode assembly (13) toward the cover plate (15), the side wall of the groove (1224) extends inclined outward along the radial direction of the connection hole (1223).

33. The battery cell according to claim 31, wherein the surface of the cover plate (15) opposite to the electrode assembly (13) and the end face of the electrode post (12) opposite to the electrode assembly (13) are flush.

34. A method for manufacturing a battery cell, wherein the battery cell is a battery cell according to any one of claims 1 to 33, and the manufacturing method is The steps include inserting one end of the tab (132) into the connection hole (1223) of the pole column (12), The steps include bringing one end of the tab (132) into contact with the first inclined surface (12211), A method for manufacturing a battery cell, comprising the step of welding one end of a tab (132) to a first inclined surface (12211).

35. The step of bringing one end of the tab (132) into contact with the first inclined surface (12211) is as follows: A method for manufacturing a battery cell according to claim 34, comprising the steps of inserting a fitting block (14) into a connecting hole (1223) and pressing one end of the tab (132) toward the first inclined surface (12211) with the fitting block (14) until the tab abuts against the first inclined surface (12211).

36. A battery comprising a battery cell according to any one of claims 1 to 33.

37. An electrical device comprising a battery according to claim 36 for supplying electrical energy.

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