Battery cell and method for manufacturing the same, battery, electrical device

Abstract

The present invention relates to a battery cell, a method for manufacturing the same, a battery, and an electrical device. The battery cell comprises a case, an electrode assembly, and a protective member. The case is provided with electrode posts, each having a first side and a second side that are opposite each other in the height direction, with the first side facing the inside of the case. The electrode posts have through holes that penetrate the first side and the second side. The electrode assembly is provided inside the case and includes an active material coated portion and a conductive portion. At least a portion of the conductive portion penetrates from the first side to the second side through the through holes. At least a portion of the protective member is provided on the side of the conductive portion away from the electrode assembly and covers the through holes. In the technical solution of the embodiment of this application, providing a protective member, providing at least a portion of the protective member on the side of the conductive portion away from the electrode assembly, and covering the through holes in the electrode posts with the protective member helps to improve the performance and reliability of the battery cell.

Description

Technical Field

[0001] [Cross - reference to Related Applications] This application is filed based on a Chinese patent application with an application number of 202311482119.2 and an application date of November 8, 2023, claims the priority of the Chinese patent application, and all the contents of the Chinese patent application are incorporated into this application by reference.

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

Background Art

[0003] Energy conservation and emission reduction are the key points for the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their energy - saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor related to their development.

[0004] In conventional battery cells, when connecting the conductive part and the pole post, foreign objects may enter the inside of the battery cell, which may deteriorate the reliability of the battery cell.

Summary of the Invention

[0005] In view of the above problems, this application provides a battery cell, a battery, and an electrical device that can reduce the probability of foreign objects entering the inside of the battery cell and improve the reliability of the battery cell.

[0006] In a first embodiment, the present application provides a battery cell comprising: a case having pole columns, wherein the pole columns have a first side and a second side that are opposite to each other in the height direction, the first side being positioned to face the inside of the case, and the pole columns having through holes that penetrate the first side and the second side; an electrode assembly provided inside the case and including an active material coated portion and a conductive portion connected to the active material coated portion, wherein at least a portion of the conductive portion penetrates from the first side to the second side through the through holes; and a protective member, at least a portion of which is provided on the side of the conductive portion away from the electrode assembly and covers the through holes.

[0007] In the technical solution of the embodiment of this application, a protective member is provided, and at least a portion of the protective member is provided on the side away from the electrode assembly of the conductive part, and the through hole in the electrode post is covered with the protective member. This reduces the probability of foreign matter entering the battery cell case from the through hole, reduces the probability of short circuits inside the battery, reduces problems such as battery ignition and explosion, and helps to improve the performance and reliability of the battery cell. At the same time, it protects at least a portion of the conductive part, exerts a position limiting effect, improves the connection stability between the conductive part and the electrode post, and further improves the reliability of the battery cell.

[0008] In some embodiments, the conductive part and the electrode post are connected by welding to form a first weld mark, and the first weld mark is positioned offset from the through hole. In the above technical solution, the first weld mark is positioned offset from the through hole, that is, the welding position of the conductive part and the electrode post is in a position that avoids the through hole. This reduces the amount of scattered welding slag that enters the inside of the battery cell case through the through hole during welding of the conductive part and the electrode post, thereby reducing the risk of short circuits. At the same time, it increases the welding area between the conductive part and the electrode post, improving the connection stability after welding of the conductive part and the electrode post, which helps to improve the reliability of the battery cell.

[0009] In some embodiments, the protective member is connected to the conductive part and the pole column by welding, and the first weld marks extend sequentially from the protective member to the conductive part and the pole column. In the above technical solution, by connecting the protective member to the conductive part and the pole column by welding, the welding quality and welding stability of the conductive part and the pole column can be improved. On the other hand, by replacing the welding nose in the conventional technology with the protective member, the conductive part can be pressed against the pole column by the protective member, reducing welding defects between the conductive part and the pole column and improving the reliability of the connection between the conductive part and the pole column. Furthermore, since the welding nose is no longer required, it is advantageous in terms of cost reduction.

[0010] In some embodiments, the first weld mark includes one weld bead, or the first weld mark includes a first weld bead, a second weld bead, and a third weld bead, wherein the second and third weld beads are located on opposite sides of the first weld bead in the width direction of the first weld bead. By adding the second and third weld beads on both sides of the first weld bead, the welding area can be increased, further improving the welding stability between the conductive part and the pole column, and increasing the overcurrent strength.

[0011] In some embodiments, the protective member is fixedly connected to the conductive part or the pole column. By providing this configuration, the protective member is fixedly attached, reducing rattle and improving the mounting stability of the protective member. This allows the protective member to fully exert its protective and dustproof effects, further improving the welding stability between the conductive part and the pole column. On the other hand, since the conductive part is held in place by the protective member instead of the conventional welding nose, the size of the pole column and the conductive part can be appropriately reduced, thereby reducing costs.

[0012] In some embodiments, the protective member and the conductive part or the pole column are connected by welding to form a second weld. In the above technical solution, by connecting the protective member and the conductive part or pole column by welding, the protective member is fixed in place, allowing the protective member to fully exert its protective, dustproof, and position-limiting effects, further improving the welding stability between the conductive part and the pole column, while also increasing the overcurrent intensity.

[0013] In some embodiments, the protective member has a avoidance hole, which is positioned offset from the through hole, and the first weld mark is provided in the avoidance hole, penetrating the conductive part and extending into the pole column. In the above technical solution, by providing a avoidance hole in the protective member, welding of the conductive part and the pole column becomes easier, at the same time, the heat input can be reduced by lowering the welding power, and further, crack formation can be suppressed, improving the welding quality and welding stability of the conductive part and the pole column.

[0014] In some embodiments, the avoidance hole is an avoidance through via, and the first weld mark extends into the avoidance through via and is connected to the hole wall of the avoidance through via. In the above technical solution, by making the avoidance hole an avoidance through via, the welding head can enter the avoidance hole and act more directly on the conductor during welding of the conductor and the pole column, making welding of the conductor and the pole column more convenient. Furthermore, since at least a portion of the peripheral wall of the avoidance through via can also be melted during welding, it fills the weld pool of the conductor and the pole column, compensating for the shrinkage of the weld pool after solidification, reducing crack defects, improving the welding quality and welding stability of the conductor and the pole column, and further reducing welding power, reducing heat input, and suppressing crack formation.

[0015] In some embodiments, the avoidance hole is an avoidance bright via, and the first weld mark is provided in the avoidance bright via and extends sequentially through the bottom wall of the avoidance bright via, the conductive part, and into the pole column. During welding of the conductive part and the pole column, the welding head can enter the avoidance bright via and act directly on the bottom wall of the avoidance bright via. When the bottom wall of the avoidance bright via melts, it fills the weld pool of the conductive part and the pole column, compensating for the shrinkage of the weld pool after solidification, reducing crack defects, and improving the welding quality and welding stability of the conductive part and the pole column. Furthermore, because the bottom wall of the avoidance bright via is thin and easily melted, welding power can be reduced, heat input can be reduced, and crack formation can be suppressed.

[0016] In some embodiments, the width of the avoidance hole is 0.2 mm to 1.2 mm. By limiting the width of the avoidance hole to the above range, the protective member can be effectively avoided, improving welding efficiency. On the other hand, by limiting the welding pool to the avoidance hole, a portion of the protective member can also melt, compensating for the solidification shrinkage of the metal in the molten pool, thereby reducing defects such as depressions and cracks in the first weld mark and improving welding quality.

[0017] In some embodiments, the width of the avoidance hole is 0.4 mm to 1 mm.

[0018] In some embodiments, the protective member includes a protective sheet provided on the second side and in close contact with the conductive portion, and a protrusion on the side of the protective sheet facing the second side that contacts the pole column. By ensuring close contact between the protective sheet and the conductive portion, the problem of the first weld mark sinking is reduced.

[0019] In some embodiments, the protrusion extends along the circumferential direction of the protective sheet. In the above technical solution, the extension of the protrusion along the circumferential direction of the protective sheet allows the pole column to stably support the protrusion, improving the reliability and stability of the protective member's installation, and further contributing to improved production efficiency.

[0020] In some embodiments, at least a portion of the protrusion between the end of the protrusion away from the protective sheet and the second side has a gap to connect the spaces on both sides of the protective sheet, or the protrusion is provided with a communication opening to connect the spaces on both sides in the thickness direction of the protective sheet. This improves the impregnation efficiency of the electrolyte.

[0021] In some embodiments, the surface of the pole column away from the active material coating is the outer end surface of the pole column, a housing groove is provided on the surface of the pole column away from the active material coating, the groove opening of the housing groove is formed on the outer end surface of the pole column, the housing groove communicates with the inside of the case through a through hole, the conductive part is inserted through the through hole and at least a portion of it is housed in the housing groove. In the above technical solution, by providing a housing groove on the pole column, the weight of the pole column can be reduced to some extent, and the gravimetric energy density of the battery cell and battery can be improved. On the other hand, since the groove opening of the housing groove is formed on the outer end surface of the pole column, and the outer end surface of the pole column is the surface away from the active material coated portion of the pole column, the housing groove can be opened in the direction away from the active material coated portion. In this way, when at least a part of the conductive portion is housed in the housing groove, the housing and arrangement of the conductive portion can be easily achieved through the groove opening of the housing groove, and electrical connection operations between the conductive portion and the pole column can be easily achieved through the groove opening of the housing groove, thereby lowering the difficulty of battery cell production and improving the production efficiency of battery cells.

[0022] In some embodiments, the housing groove has a first groove side wall and a second groove side wall that are opposite to each other in the width direction, the through hole is provided in the groove bottom wall of the housing groove, and the conductive portion has a first extension, the first extension extending from the through hole and being provided in close contact with the groove bottom wall of the housing groove at a position close to the first groove side wall. In the above technical solution, by providing the first extension of the conductive portion in close contact with the groove bottom wall of the housing groove at a position close to the first groove side wall, the contact area between the conductive portion and the pole column can be increased, improving the weldability of the conductive portion and the pole column, while at the same time reducing the outflow of metal from the welding pool and ensuring that the welding pool is filled with metal, which helps to improve the stability of the electrical connection between the conductive portion and the pole column.

[0023] In some embodiments, the protective member is housed in the housing groove and covers the first extension. The housing groove restricts the position of the protective member and improves the mounting reliability and stability of the protective member, thereby allowing the protective member to fully exert its protective, position-restricting, and dustproof effects, improving the connection stability between the conductive part and the pole column, and further improving the reliability of the battery cell. On the other hand, since the protective member does not occupy space in the height direction of the pole column, it helps to improve the space utilization rate within the pole column.

[0024] In some embodiments, the number of through holes is one, and the conductive portion further has a second extension, the second extension and the first extension extending from the through hole, and the second extension is provided in close contact with the groove bottom wall of the housing groove at a position close to the second groove side wall. In the above technical solution, by dividing the conductive portion into at least a first extension and a second extension, and bringing the first and second extensions into close contact with different positions on the groove bottom wall, the first and second extensions become easier to bend to the second side of the pole column, making it easier to connect the first and second extensions to the pole column, and consequently, making it easier to connect the first and second extensions to the protective member, for example, welding the first and second extensions to the pole column. Furthermore, it is possible to reduce welding power, reduce heat input, minimize crack defects, and improve the welding reliability of the conductive portion and the pole column. On the other hand, the thickness of the conductive portion on the second side of the pole column can be reduced, and the space occupied by the conductive portion in the height direction within the pole column can be reduced.

[0025] In some embodiments, the protective member is housed in the housing groove and covers the first extension and the second extension. The housing groove restricts the position of the protective member and improves the mounting reliability and stability of the protective member, thereby allowing the protective member to fully exert its protective, position-restricting, and dustproof effects, improving the connection stability between the conductive part and the pole column, and further improving the reliability of the battery cell. On the other hand, since the protective member does not occupy space in the height direction of the pole column, it helps to improve the space utilization rate within the pole column.

[0026] In some embodiments, the number of through holes is multiple, the conductive portion has multiple extensions, each of which extends from the multiple through holes and is provided in close contact with the bottom wall of the housing groove. In the above technical solution, by providing multiple through holes and having the conductive portion include multiple extensions, each of the multiple extensions of the conductive portion can be passed through the multiple through holes, the thickness of each extension can be reduced, each extension can be easily bent toward the second side of the pole column, connection between the extension and the pole column can be made more convenient, and the space occupied by the conductive portion in the height direction within the pole column can be reduced.

[0027] In some embodiments, the protection member is received in the receiving groove and covers all of the extending portions. The receiving groove restricts the position of the protection member, improves the mounting reliability and stability of the protection member, thereby fully exerting the protection, position restriction, and dust-proof functions of the protection member, improving the connection stability between the conductive portion and the pole post, and further improving the reliability of the battery cell. On the other hand, since the protection member does not occupy space in the height direction of the pole post, it helps to improve the space utilization rate inside the pole post.

[0028] In some embodiments, the case includes a case cover and a case body having an opening, the case cover is provided to cover the opening, at least one of the pole posts is provided on the case cover, or at least one of the pole posts is provided on a wall body provided opposite to the opening of the case body. By providing at least one pole post on a case cover with a small size, the size of the mold or fixture can be reduced, which helps to reduce costs. Also, by providing at least one pole post on a wall body provided opposite to the opening of the case body, the electrode assembly enters the case body along the opening, the conductive portion directly faces the pole post, the connection between the conductive portion and the pole post becomes convenient, and the mounting efficiency of the battery cell can be improved.

[0029] In a second aspect, the present application provides a battery including the battery cell in the above embodiment.

[0030] In the technical solution of the embodiment of the present application, by using the above battery cell, problems such as ignition and explosion of the battery can be reduced, which helps to improve the performance and reliability of the battery.

[0031] In a third aspect, the present application provides an electrical device including the battery in the above embodiment.

[0032] In the technical solution of the embodiment of the present application, by using the above battery, problems such as ignition and explosion can be reduced, which helps to improve the performance and reliability of the vehicle.

[0033] In a fourth embodiment, the present application provides a method for manufacturing a battery cell, comprising the steps of: providing a case, an electrode assembly, and a protective member; incorporating the electrode assembly into the case and allowing at least a portion of the conductive part of the electrode assembly to pass through through holes for electrode posts in the case; providing at least a portion of the protective member at one end of the electrode post away from the inside of the case so as to cover the through holes; and connecting the conductive part and the electrode post.

[0034] In the technical solution of the embodiment of this application, by providing at least a portion of the protective member on the side away from the electrode assembly of the conductive part and covering the through hole in the electrode column with the protective member, the probability of foreign matter entering the battery cell case through the through hole is reduced, the probability of short circuits inside the battery is reduced, problems such as battery ignition and explosion are reduced, and it is possible to improve the performance and reliability of the battery cell. At the same time, at least a portion of the conductive part is protected, exhibiting positional restriction and dustproof effects, improving the connection stability between the conductive part and the electrode column, and further improving the reliability of the battery cell.

[0035] In some embodiments, in the step of connecting the conductive part and the pole column, at least one of the conductive part and the pole column is connected to the protective member. In the above technical solution, by connecting at least one of the conductive part and the pole column to the protective member, the protective member can be fixed in place, rattling of the protective member can be reduced, the mounting stability of the protective member can be improved, the protective member can fully exert its protective and dustproof effect, the welding stability of the conductive part and the pole column can be further improved, and on the other hand, since the conductive part is held in place by the protective member instead of the welding nose of the conventional technology, the size of the pole column and the conductive part can be appropriately reduced, and costs can be reduced.

[0036] In some embodiments, prior to the step of connecting the conductive portion and the pole column, the protective member is further pressed down by arranging a plurality of retaining bars on the side of the protective member away from the pole column, thereby pressing down the conductive portion with the protective member. In the above technical solution, by pressing down the protective member with a plurality of retaining bars, the protective member is brought into close contact with the conductive portion, the position of the conductive portion is restricted by the protective member, and the reliability and stability of the connection between the conductive portion and the pole column can be improved.

[0037] The above description is merely a general overview of the technical solution of this application. In order to more clearly understand the technical means of this application and to implement them based on the contents of the specification, and to make the above and other objectives, features, and benefits of this application easier to understand, specific embodiments of this application are given below. [Brief explanation of the drawing]

[0038] By reviewing the detailed description of the preferred embodiments below, various other merits and advantages will become obvious to those skilled in the art. The drawings are for illustrative purposes only and should not be construed as limiting this application. Throughout the drawings, the same reference numerals indicate the same components. The description of the drawings is as follows.

[0039] [Figure 1] This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. [Figure 2] This is an exploded view of the structure of a battery provided in some embodiments of this application. [Figure 3] This is a three-dimensional view of a battery cell provided in some embodiments of this application. [Figure 4] These are schematic diagrams illustrating the structure of the electrode posts, conductive parts, protective members, etc., of a battery cell provided in some embodiments of this application. [Figure 5] This is a cross-sectional view of the structure shown in Figure 4. [Figure 6] Figure 4 is a schematic diagram of the protective member and conductive part structure. [Figure 7]These are cross-sectional views of electrode posts, conductive parts, protective members, etc., of a battery cell provided in some embodiments of this application. [Figure 8] This is a cross-sectional view of the electrode post, conductive part, protective member, etc. of a battery cell provided in another embodiment of this application. [Figure 9] This is a cross-sectional view of the electrode post, conductive part, protective member, etc. of a battery cell provided in several other embodiments of this application. [Figure 10] These are schematic diagrams illustrating the structure of the electrode posts, conductive parts, protective members, etc., of a battery cell provided in some embodiments of this application. [Figure 11] This is a cross-sectional view of the structure shown in Figure 10. [Figure 12] These are cross-sectional views of electrode posts, conductive parts, protective members, etc., of a battery cell provided in some embodiments of this application. [Figure 13] This is a cross-sectional view of the electrode post, conductive part, protective member, etc. of a battery cell provided in another embodiment of this application. [Figure 14] This is a cross-sectional view of the electrode post, conductive part, protective member, etc. of a battery cell provided in several other embodiments of this application. [Figure 15] These are cross-sectional views of electrode posts, conductive parts, protective members, etc., of a battery cell provided in some embodiments of this application. [Figure 16] This is a cross-sectional view of the electrode post, conductive part, protective member, etc. of a battery cell provided in another embodiment of this application. [Figure 17] This is a cross-sectional view of the electrode post, conductive part, protective member, etc. of a battery cell provided in several other embodiments of this application. [Figure 18] This is a cross-sectional view of the electrode post, conductive part, protective member, etc. of a battery cell provided in several other embodiments of this application. [Figure 19] These are cross-sectional views of electrode posts, conductive parts, protective members, etc., of a battery cell provided in some embodiments of this application. [Figure 20] This is a cross-sectional view of the electrode post, conductive part, protective member, etc. of a battery cell provided in another embodiment of this application. [Figure 21] This is a cross-sectional view of the electrode post, conductive part, protective member, etc. of a battery cell provided in several other embodiments of this application. [Figure 22] These are cross-sectional views of electrode posts, conductive parts, protective members, etc., of a battery cell provided in some embodiments of this application. [Figure 23] This is a cross-sectional view of the electrode post, conductive part, protective member, etc. of a battery cell provided in another embodiment of this application. [Figure 24] This is a cross-sectional view of the electrode post, conductive part, protective member, etc. of a battery cell provided in several other embodiments of this application. [Figure 25] This is a schematic diagram of a partial structure of a battery cell provided in some embodiments of this application. [Figure 26] This is a flowchart of the manufacturing method of a battery cell according to some embodiments of this application. [Modes for carrying out the invention]

[0040] The following examples of embodiments of the technical solution of this application will be described in detail with reference to the drawings. The following embodiments are used solely to illustrate the technical solution of this application more clearly and are merely examples; they should not limit the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art. Terms used herein are for illustrative purposes only and are not intended to limit this application. Terms such as “includes,” “has,” and any variations thereof in the description, claims, and brief description of the drawings above are intended to cover the non-exclusive “includes.”

[0042] In the descriptions of the embodiments of this application, technical terms such as "first," "second," etc., are merely for distinguishing different subjects and should not be understood as indicating or implying relative importance, or suggesting the number of technical features shown, a specific order, or a primary-secondary relationship. In the descriptions of the embodiments of this application, unless otherwise clearly and specifically limited, "multiple" means two or more.

[0043] Where the “Examples” are described herein, it means that the specific features, structures, or properties described by the Examples may be included in at least one Example of this Application. The phrase “Examples” appearing in different parts of the Specification does not necessarily refer to the same Example, nor does it refer to an Example that is exclusively independent or alternative to another Example. It will be understood expressly or implicitly by those skilled in the art that the Examples described herein may be combined with other Examples.

[0044] In the description of the embodiments of this application, the term "and / or" is merely used to describe the relationship between related objects, and indicates that there may be three such relationships. For example, A and / or B can represent the case where A exists alone, where A and B exist simultaneously, or where B exists alone. In addition, the symbol " / " in this specification generally means that the preceding and following related objects are in an "or" relationship.

[0045] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more sets (including two sets), and "multiple sheets" refers to two or more sheets (including two sheets).

[0046] In the description of the embodiments of this application, the orientations or positional relationships indicated by technical terms such as "center," "vertical direction," "horizontal direction," "length," "width," "thickness," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," "axial direction," "radial direction," and "circumferential direction" are orientations or positional relationships shown based on the drawings, and are merely for the purpose of making the embodiments of this application easier to explain and simplifying the description. They do not explicitly or implicitly suggest that the shown devices or elements necessarily have a specific orientation, or are composed and operated in a specific orientation, and should not be understood as limiting the embodiments of this application.

[0047] In the descriptions of the embodiments of this application, unless otherwise explicitly specified or limited, technical terms such as "attach," "connect," "join," and "fix" should be understood in a broad sense. For example, they may refer to fixed connections, removable connections, or integration. They may also refer to mechanical or electrical connections. Furthermore, they may refer to direct connections, indirect connections via an intermediate mediator, or communication between the interiors of two elements or an 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.

[0048] Currently, market trends indicate that the applications of power batteries are expanding. Power batteries are widely used not only in energy storage systems such as hydroelectric, thermal, wind, and solar power plants, but also in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application fields of power batteries expand, market demand is also increasing.

[0049] Conventional battery cells include electrode posts and electrode assemblies, the electrode assemblies having an active material coated portion and a conductive portion, and the electrode posts are provided with through holes. When connecting the conductive portion to the electrode post, the conductive portion is first passed through the through hole in the electrode post and bent to the opposite side of the electrode post from the active material coated portion before connecting the conductive portion to the electrode post.

[0050] However, this design allows foreign objects to enter the battery cell case through the through-holes, which not only affects the quality of the connection between the conductive parts and the electrode posts, but if the foreign object is a conductive material, it could cause a short circuit inside the battery, creating safety risks such as fire and explosion, and significantly impairing the performance and reliability of the battery cell.

[0051] To improve the performance and reliability of the battery cell, the embodiment of this application provides a protective member on the side away from the electrode assembly of the conductive part, and by covering the through-hole of the electrode column with the protective member, the probability of foreign matter entering the inside of the battery cell through the through-hole can be reduced, which helps to improve the performance and reliability of the battery cell.

[0052] The battery cells, batteries, and electrical devices disclosed in the embodiments of this application can be used in electrical devices powered by batteries or in various energy storage systems that use batteries as energy storage elements. Electrical devices may include, but are not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, electric motorcycles, electric vehicles, ships, aircraft, etc. Here, electric toys may include, for example, fixed or portable electric toys such as game consoles, electric vehicle toys, electric boat toys, and electric airplane toys, and aircraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0053] In the following embodiments, for the sake of clarity, we will use the example that the electrical device 1000 in some embodiments of this application is a vehicle.

[0054] Referring to Figure 1, which is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The electric vehicle may be a fuel-powered vehicle, a natural gas vehicle, or a new energy vehicle, and the new energy vehicle may be a battery-powered vehicle, a hybrid vehicle, or a range-extender vehicle. A battery 100 is provided inside the vehicle, and the battery 100 may be located at the bottom, top, or rear of the vehicle. The battery 100 is used to supply power to the vehicle, and for example, the battery 100 may be the operating power source of the vehicle. The vehicle may further include a controller 200 and a motor 300. The controller 200 controls the battery 100 to supply power to the motor 300, and is used, for example, when operating power is required during vehicle startup, navigation, and driving.

[0055] In some embodiments of this application, the battery 100 may be the operating power source for the vehicle, or it may be the driving power source for the vehicle, which provides driving force to the vehicle by replacing or partially replacing fuel or natural gas.

[0056] Referring to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application, the battery 100 comprises a box 101 and a battery cell 10 housed in the box 101. Here, the box 101 is for providing a housing space for the battery cell 10 and can employ various structures. In some embodiments, the box 101 has a first portion 1011 and a second portion 1012, and the first portion 1011 and the second portion 1012 overlap to define a housing space for housing the battery cell 10. The second portion 1012 may be a hollow structure with one end open, and the first portion 1011 may be a plate-like structure, and the first portion 1011 is covered on the open side of the second portion 1012, thereby defining the housing space by the first portion 1011 and the second portion 1012. Both the first part 1011 and the second part 1012 may be hollow structures with one side open, and the open side of the first part 1011 is covered by the open side of the second part 1012. Of course, the box 101 formed by the first part 1011 and the second part 1012 may be of various shapes, such as a cylinder or a rectangular parallelepiped.

[0057] In the battery 100, there may be multiple battery cells 10, and the multiple battery cells 10 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that among the multiple battery cells 10, some are connected in series and others are connected in parallel. Multiple battery cells 10 may be directly connected in series, in parallel, or in a mixed connection, and then the integrated multiple battery cells 10 may be housed in a box 101. Of course, the battery 100 may also be formed by first connecting multiple battery cells 10 in series, in parallel, or in a mixed connection to form a battery module, and then further integrating the multiple battery modules by connecting them in series, in parallel, or in a mixed connection, and then housing them in a box 101. The battery 100 may further include other structures. For example, the battery 100 may further include busbar members for realizing electrical connections between the multiple battery cells 10.

[0058] Each battery cell 10 may be a secondary battery or a primary battery, and may be, but is not limited to, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell 10 may be cylindrical, flattened, rectangular, or have other shapes.

[0059] Referring to Figure 3, which is a three-dimensional view of a battery cell 10 provided in some embodiments of this application, a battery cell 10 refers to the smallest constituent unit of a battery. As shown in Figure 3, the battery cell 10 comprises a case 11 and an electrode assembly 2, the case 11 having a case cover 112 and a case body 111.

[0060] The case cover 112 refers to a component that covers the opening 1110 of the case body 111 and isolates the internal environment of the battery cell 10 from the external environment. The shape of the case cover 112 may match the shape of the case body 111, but is not limited to this. Selectively, the case cover 112 may be manufactured from a material (e.g., aluminum alloy) that has a certain degree of hardness and strength so as not to deform when pressed or impacted. This allows the battery cell 10 to have higher structural strength, and safety can be improved to some extent. Functional components such as electrode terminals may be provided on the case cover 112. The electrode terminals can be electrically connected to the electrode assembly 2 to output or input electrical energy from the battery cell 10. In some embodiments, the case cover 112 may further be provided with a pressure release mechanism to release internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold. The case cover 112 may be made of various materials such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic, but is not particularly limited to these materials in the embodiments of this application. In some embodiments, the inside of the case cover 112 may be further provided with an insulating member capable of isolating the case cover 112 from the electrical connection members in the case body 111 to reduce the risk of short circuits. Exemplarily, the insulating member may be made of plastic, rubber, or the like.

[0061] The case body 111, together with the case cover 112, is a component for forming the internal environment of the battery cell 10, and the internal environment formed by them can accommodate the electrode assembly 2, electrolyte, and other components. The case body 111 and the case cover 112 may be independent components, and the case body 111 may be provided with an opening 1110, and the internal environment of the battery cell 10 may be formed by overlapping the case cover 112 over the opening 1110. The case cover 112 and the case body 111 may be integrated, but are not limited to this. Specifically, the case cover 112 and the case body 111 may have a common connection surface formed before other components are incorporated into the case, and when sealing the inside of the case body 111, the case cover 112 may be placed over the case body 111. The case body 111 may be of various shapes and sizes, such as a rectangular parallelepiped, cylindrical shape, or hexagonal prism shape. Specifically, the shape of the case body 111 may be determined according to the specific shape and size of the electrode assembly 2. The case body 111 may be made of various materials such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic, but the embodiments of this application are not particularly limited to these materials.

[0062] The electrode assembly 2 is a component that undergoes an electrochemical reaction in the battery cell 10. The electrode assembly 2 is housed within the case 11, and as shown in Figure 3, the Z direction in the figure is the height direction of the electrode assembly 2, the X direction is the width direction of the electrode assembly 2, and the Y direction is the thickness direction of the electrode assembly 2. The case 11 may contain one or more electrode assemblies 2. The electrode assembly 2 is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and generally a separator is provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet that contain active material constitute the main body of the electrode assembly 2, and the portions of the positive electrode sheet and the negative electrode sheet that do not contain active material each constitute a tab. The positive electrode tab and the negative electrode tab may both be located at the same end of the main body, or they may each be located at opposite ends of the main body. During charging and discharging of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminals to form a current circuit.

[0063] The battery cell 10 further includes an explosion-proof valve 4, which can properly exhaust and release pressure.

[0064] According to some embodiments of this application, referring to Figure 3, and further to Figures 4 to 6, Figure 4 is a schematic diagram of the structure of the pole 12, conductive part 22, protective member 3, etc. of a battery cell 10 provided in some embodiments of this application, Figure 5 is a cross-sectional view of the structure shown in Figure 4, and Figure 6 is a schematic diagram of the structure of the protective member 3 and conductive part 22 shown in Figure 4. The pole 12 is provided in the case 11, and the pole 12 has a first side and a second side that are opposite to each other in the height direction, in Figure 5, the R direction is the height direction of the pole 12, the first side of the pole 12 is provided so as to face the inside of the case 11, and the second side of the pole 12 is provided so as to move away from the inside of the case 11.

[0065] A through-hole 122 is provided in the pole column 12, and the through-hole 122 penetrates from the first side to the second side. Here, "penetration" means that one end of the through-hole 122 in the direction of extension extends to the first side of the pole column 12, and the other end of the through-hole 122 in the direction of extension extends to the second side of the pole column 12, thereby connecting the spaces on both sides of the pole column 12 in the height direction through the through-hole 122. Since at least a portion of the conductive part 22 penetrates from the first side to the second side through the through-hole 122, the conductive part 22 can be inserted into the pole column 12 and bent to the second side of the pole column 12 so that it is provided in close contact with the pole column 12.

[0066] The pole post 12 and the conductive part 22 may be fixed and electrically connected by welding. Of course, the pole post 12 and the conductive part 22 may also be fixed and electrically connected by conductive adhesive or conductive screws.

[0067] Referring again to Figures 4 to 6, and further to Figure 7, Figure 7 is a cross-sectional view of the electrode poles 12, conductive part 22, protective member 3, etc. of a battery cell 10 provided in some embodiments of the present application, the battery cell 10 further includes the protective member 3, at least a portion of which is provided on the side of the conductive part 22 away from the electrode assembly 2, and the protective member 3 covers the through hole 122, thereby reducing the probability that foreign matter enters the case 11 of the battery cell 10 through the through hole 122.

[0068] In the technical solution of the embodiment of this application, a protective member 3 is provided, and at least a portion of the protective member 3 is provided on the side of the conductive part 22 away from the electrode assembly 2, and the through hole 122 in the pole column 12 is covered by the protective member 3, thereby reducing the probability that foreign matter enters the case 11 of the battery cell 10 from the through hole 122, reducing the probability that a short circuit will occur inside the battery 100, and reducing problems such as ignition and explosion of the battery 100, thereby contributing to the improvement of the performance and reliability of the battery cell 10. At the same time, at least a portion of the conductive part 22 is protected, exhibiting a position limiting effect, and the connection stability between the conductive part 22 and the pole column 12 is improved, further improving the reliability of the battery cell 10.

[0069] Referring to Figure 8, which is a cross-sectional view of the electrode post 12, conductive part 22, protective member 3, etc. of a battery cell 10 provided in another embodiment of this application. The conductive part 22 and the electrode post 12 are connected by welding to form a first weld mark 23, electrically connecting the conductive part 22 and the electrode post 12. The conductive part 22 and the electrode post 12 may be laser welded.

[0070] Furthermore, the first weld mark 23 is positioned offset from the through hole 122. That is, the welding position between the conductive part 22 and the pole column 12 is positioned to avoid the through hole 122. Since the first weld mark 23 and the through hole 122 are separated by a certain distance, and the through hole 122 is covered by the protective member 3, it is possible to reduce the amount of scattered welding slag that enters the inside of the battery cell 10 case 11 through the through hole 122 during welding of the conductive part 22 and the pole column 12, thereby reducing the risk of short circuits. At the same time, it is possible to increase the welding area between the conductive part 22 and the pole column 12, improving the connection stability after welding of the conductive part 22 and the pole column 12, which helps to improve the reliability of the battery cell 10.

[0071] Referring again to Figure 8, the protective member 3, the conductive part 22, and the pole column 12 are connected by welding, forming a first weld mark 23, which extends sequentially from the protective member 3 into the conductive part 22 and the pole column 12.

[0072] During welding of the conductive part 22 and the pole column 12, if a portion of the protective member 3 melts, it fills the weld pool of the conductive part 22 and the pole column 12, compensating for the shrinkage after solidification of the weld pool, reducing crack defects in the first weld mark 23, and improving the welding quality of the conductive part 22 and the pole column 12. Furthermore, by pressing the conductive part 22 with the protective member 3 instead of the welding nose during welding in conventional technology, the position of the conductive part 22 can be restricted, allowing the size of the pole column 12 and the conductive part 22 to be appropriately reduced, thereby reducing costs and improving the welding stability of the conductive part 22 and the pole column 12.

[0073] Furthermore, welding the protective member 3 to the conductive part 22 and the pole column 12 reduces rattle of the protective member 3, improves the mounting stability of the protective member 3, allows the protective member 3 to fully exert its protective, position-restricting, and dustproof effects, and further improves the welding stability of the conductive part 22 and the pole column 12.

[0074] Therefore, in the above technical solution, by connecting the protective member 3, the conductive part 22, and the pole column 12 by welding, the welding quality and welding stability of the conductive part 22 and the pole column 12 can be improved. On the other hand, instead of the welding nose in the conventional technology, the protective member 3 can press the conductive part 22 against the pole column 12, reducing welding defects between the conductive part 22 and the pole column 12 and improving the reliability of the connection between the conductive part 22 and the pole column 12. Furthermore, since the welding nose is no longer required, it is advantageous in terms of cost reduction.

[0075] Referring again to Figure 8, the first weld mark 23 includes one weld bead, or the first weld mark 23 has a first weld bead 231, a second weld bead 232, and a third weld bead 233, and in the width direction of the first weld bead 231, the second weld bead 232 and the third weld bead 233 are located on opposite sides of the first weld bead 231. By further adding the second weld bead 232 and the third weld bead 233 compared to the case where only the first weld bead 231 is provided, the welding area can be increased, further improving the welding stability of the conductive part 22 and the pole column 12 and increasing the overcurrent strength.

[0076] In another embodiment, the protective member 3 and the conductive part 22 or pole column 12 are connected in a fixed manner.

[0077] By installing it in this manner, the protective member 3 is fixed in place, reducing rattling of the protective member 3, improving the mounting stability of the protective member 3, allowing the protective member 3 to fully exert its protective and dustproof effects, and further improving the welding stability of the conductive part 22 and the pole column 12. On the other hand, since the conductive part 22 is held down by the protective member 3 instead of the welding nose of the conventional technology, the size of the pole column 12 and the conductive part 22 can be appropriately reduced, thereby reducing costs.

[0078] Referring again to Figure 8, and further to Figure 9, Figure 9 is a cross-sectional view of the pole 12, conductive part 22, protective member 3, etc. of a battery cell 10 provided in several other embodiments of this application. The protective member 3 and the conductive part 22 or pole 12 are connected by welding to form a second weld mark 24, i.e., the protective member 3 is fixed to the conductive part 22 or pole 12 by welding.

[0079] Specifically, the protective member 3 may be welded to the conductive part 22 or pole column 12 before welding the conductive part 22 to the pole column 12, or the protective member 3 may be welded to the conductive part 22 or pole column 12 after welding the conductive part 22 to the pole column 12. Of course, the welding of the conductive part 22 to the pole column 12 and the welding of the protective member 3 to the conductive part 22 or pole column 12 may be performed simultaneously.

[0080] More specifically, when welding the protective member 3 and the pole column 12, the second weld mark 24 may be formed in the shape of a strip extending along the circumferential direction of the protective member 3, or it may be a plurality of independently provided weld points, which will not be repeated here.

[0081] In the above technical solution, the protective member 3 is fixed in place by welding it to the conductive part 22 or pole column 12, thereby fully utilizing the protective, dustproof, and position-limiting effects of the protective member 3, further improving the welding stability of the conductive part 22 and pole column 12, and at the same time increasing the overcurrent strength.

[0082] Of course, the connection between the protective member 3 and the conductive part 22 or pole column 12 is not limited to welding, but may also be achieved by adhesive, interlocking, fastening members, etc.

[0083] Referring further to Figures 10 and 11, Figure 10 is a schematic diagram of the structure of a battery cell 10 provided in some embodiments of the present application, including the pole 12, conductive part 22, protective member 3, etc., and Figure 11 is a cross-sectional view of the structure shown in Figure 10. The protective member 3 has a relief hole 301, which is positioned offset from the through hole 122, and a first weld mark 23 is provided in the relief hole 301, which penetrates the conductive part 22 and extends into the pole 12.

[0084] Specifically, the conductive part 22 and the pole column 12 may be connected by laser welding, and of course, the conductive part 22 and the pole column 12 may also be connected by other welding methods.

[0085] Taking laser welding as an example, during welding of the conductive part 22 and the pole column 12, the laser welding head can enter the avoidance hole 301 and act closer to the conductive part 22, making welding of the conductive part 22 and the pole column 12 easier. Furthermore, during welding, at least a portion of the hole wall of the avoidance hole 301 can also be melted, filling the weld pool of the conductive part 22 and the pole column 12. This compensates for the shrinkage of the weld pool after solidification, reduces crack defects in the first weld mark 23, and improves the welding quality and welding stability of the conductive part 22 and the pole column 12. In addition, because the laser avoids at least a portion of the structure of the protective member 3, the laser power can be reduced, the heat input can be reduced, and crack formation can be suppressed.

[0086] Therefore, in the above technical solution, by providing the avoidance hole 301 in the protective member 3, welding of the conductive part 22 and the pole column 12 can be made more convenient, while reducing the welding power reduces the heat input, further suppresses crack formation, and improves the welding quality and welding stability of the conductive part 22 and the pole column 12.

[0087] In some embodiments, the width L of the avoidance hole 301 is 0.2 mm to 1.2 mm. For example, the width L of the avoidance hole 301 is 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, etc. By limiting the width of the avoidance hole 301 to the above range, the protective member 3 can be effectively avoided, improving welding efficiency. At the same time, the welding pool can be limited to the avoidance hole 301, and a portion of the protective member 3 can also be melted to compensate for the solidification shrinkage of the metal in the molten pool, reducing the depression of the first weld mark 23, minimizing defects such as cracks, and improving welding quality.

[0088] In some selective embodiments, the width L of the avoidance hole 301 is 0.4 mm to 1 mm, and for example, the width L of the avoidance hole 301 may be 0.4 mm, 0.7 mm, 1 mm, etc.

[0089] Referring again to Figures 10 and 11, and further to Figures 12 and 13, Figure 12 is a cross-sectional view of the pole 12, conductive part 22, protective member 3, etc. of a battery cell 10 provided in some embodiments of this application, and Figure 13 is a cross-sectional view of the pole 12, conductive part 22, protective member 3, etc. of a battery cell 10 provided in other embodiments of this application. The avoidance hole 301 is an avoidance through via, where an "avoidance through via" is a hole structure with conductive ends, and in this application, the avoidance through via penetrates the side of the protective member 3 opposite to the conductive part 22 and the side of the protective member 3 facing the conductive part 22.

[0090] The first weld mark 23 extends into the bypass through via, that is, the first weld mark 23 is formed in the original position of the bypass through via and connects to the hole wall of the bypass through via, thereby welding the protective member 3 to the conductive part 22 and the pole column 12.

[0091] In the above technical solution, by using the avoidance hole 301 as an avoidance through via, the welding head can enter the avoidance hole 301 during welding of the conductive part 22 and the pole column 12, and act more directly on the conductive part 22. This makes welding of the conductive part 22 and the pole column 12 more convenient. Furthermore, during welding, at least a portion of the peripheral wall of the avoidance through via can also be melted, filling the weld pool of the conductive part 22 and the pole column 12. This compensates for the shrinkage of the weld pool after solidification, reduces crack defects, improves the welding quality and welding stability of the conductive part 22 and the pole column 12, and further reduces welding power, reduces heat input, and suppresses crack formation.

[0092] Referring further to Figure 14, which is a cross-sectional view of the pole post 12, conductive part 22, protective member 3, etc. of a battery cell 10 provided in several other embodiments of this application. The protective member 3 has a relief hole 301, which is positioned offset from the through hole 122, and the protective member 3 and the conductive part 22 and pole post 12 are connected by welding at the relief hole 301, forming a first weld mark 23, and the edge of the protective member 3 and the pole post 12 are connected by welding, forming a second weld mark 24.

[0093] In another embodiment, the avoidance hole 301 is an avoidance bright via, where an "avoidance bright via" is a hole structure in which one end is conductive and the other end is closed. In this application, the avoidance bright via is provided on the side opposite to the conductive portion 22 of the protective member 3, and the opening 1110 of the avoidance bright via may be located on the side opposite to the conductive portion 22 of the protective member 3. Of course, the avoidance bright via may also be provided on the side facing the conductive portion 22 of the protective member 3, and the opening 1110 of the avoidance bright via may be located on the side facing the conductive portion 22 of the protective member 3.

[0094] The first weld mark 23 is provided on the avoidance bright via, that is, the first weld mark 23 may be formed at the original position of the avoidance bright via, and the first weld mark 23 extends into the pole column 12 by sequentially penetrating the bottom wall of the avoidance bright via and the conductive part 22, thereby welding the protective member 3, the conductive part 22, and the pole column 12.

[0095] Specifically, during welding of the conductive part 22 and the pole column 12, the welding head can enter the avoidance bright via and directly act on the bottom wall of the avoidance bright via. When the bottom wall of the avoidance bright via melts, it fills the weld pool between the conductive part 22 and the pole column 12, compensating for the shrinkage of the weld pool after solidification, reducing crack defects, and improving the welding quality and welding stability of the conductive part 22 and the pole column 12. Furthermore, because the bottom wall of the avoidance bright via is thin and easily melted, the welding power can be reduced, the heat input can be reduced, and crack formation can be suppressed.

[0096] Referring again to Figures 6 to 9 and Figures 12 to 14, the protective member 3 includes a protective sheet 31 and a protrusion 32. The protective sheet 31 is provided on the second side of the pole column 12 and is in close contact with the conductive part 22. The protrusion 32 is provided on the side of the protective sheet 31 facing the second side of the pole column 12. The protrusion 32 contacts the pole column 12, causing the protective sheet 31 and the conductive part 22 to be in close contact, thereby reducing the problem of the first welding mark 23 sinking.

[0097] Referring to Figure 6, the protrusion 32 extends along the circumferential direction of the protective sheet 31, and a housing cavity 302 is defined between the protective sheet 31, the protrusion 32 and the pole column 12. At least a portion of the conductive portion 22 penetrates from the first side to the second side through the through hole 122 and is housed in the housing cavity 302.

[0098] The protrusions 32 may be formed as a closed annular structure extending along the circumferential direction of the protective sheet 31, or as an open annular structure extending along the circumferential direction of the protective sheet 31, or they may be formed as a plurality of protruding ribs arranged at intervals in the circumferential direction of the protective sheet 31, each extending along the circumferential direction of the protective sheet 31.

[0099] In the above technical solution, the protrusion 32 extends along the circumferential direction of the protective sheet 31, thereby stably supporting the protrusion 32 by the pole column 12, improving the mounting reliability and stability of the protective member 3, and further contributing to improved production efficiency.

[0100] To improve the electrolyte impregnation efficiency, after connecting the electrode post 12 and the conductive part 22, the space where the first side of the electrode post 12 is located and the space where the second side of the electrode post 12 is located are connected. Since the conductive part 22 is covered by the protective member 3, in some embodiments, there is a gap between at least a portion of the protrusion 32 from the protective sheet 31 and the second side, and the spaces on both sides of the protective sheet 31 are connected by the gap. Alternatively, in another embodiment, a communication opening is provided in the protrusion 32, and the spaces on both sides in the thickness direction of the protective sheet 31 are connected by the communication opening, thereby allowing the electrolyte to enter the case 11 through the gap or the communication opening.

[0101] Referring again to Figures 7-9 and 12-14, the surface of the pole column 12 away from the active material coated portion 21 is the outer end surface 123 of the pole column. A accommodating groove 121 is provided on the surface of the pole column 12 away from the active material coated portion 21. The groove opening of the accommodating groove 121 is formed on the outer end surface 123 of the pole column. The accommodating groove 121 communicates with the inside of the case 11 through a through hole 122. The conductive portion 22 is inserted through the through hole 122 and at least a portion of it is housed in the accommodating groove 121.

[0102] The receiving groove 121 is a groove body, which is a groove-like structure having a certain depth. For example, if the pole column 12 is provided on the upper end wall of the case 11 and the outer end surface 123 of the pole column is the upper surface of the pole column 12, the receiving groove 121 is formed as a receiving groove 121 in which the groove opening is open upward and the groove wall is recessed downward. Also, for example, if the pole column 12 is provided on the lower end wall of the case 11 and the outer end surface 123 of the pole column is the lower surface of the pole column 12, the receiving groove 121 is formed as a receiving groove 121 in which the groove opening is open downward and the groove wall is recessed upward.

[0103] In the above technical solution, by providing a housing groove 121 in the pole column 12, the weight of the pole column 12 can be reduced to some extent, improving the gravitational energy density of the battery cell 10 and the battery 100. On the other hand, since the groove opening of the housing groove 121 is formed on the outer end surface 123 of the pole column, and the outer end surface 123 is the surface of the pole column 12 away from the active material coated portion 21, the housing groove 121 can be opened in the direction away from the active material coated portion 21. In this way, when at least a part of the conductive portion 22 is housed in the housing groove 121, the housing and arrangement of the conductive portion 22 can be easily achieved through the groove opening of the housing groove 121. Furthermore, electrical connection operations between the conductive portion 22 and the pole column 12 can be easily achieved through the groove opening of the housing groove 121, thereby reducing the difficulty of producing the battery cell 10 and improving the production efficiency of the battery cell 10.

[0104] Furthermore, since the storage groove 121 communicates with the inside of the case 11 through the through hole 122, the storage groove 121 can also function as a buffer and temporary storage structure for the electrolyte, thereby allowing more electrolyte to be stored in the case 11. As the electrolyte is consumed during the charging and discharging of the battery cell 10, if the amount of electrolyte increases, the service life of the battery cell 10 can be extended. Similarly, since the storage groove 121 communicates with the inside of the case 11 through the through hole 122, the storage groove 121 can also simultaneously function as a gas storage and buffer structure for gas generated inside the electrode assembly 2, thereby reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0105] Referring to Figures 7 to 9 and Figures 12 to 14, the accommodating groove 121 has a groove bottom wall 1213, a first groove side wall 1211 and a second groove side wall 1212, the first groove side wall 1211 and the second groove side wall 1212 are provided opposite each other in the width direction of the accommodating groove 121, the through hole 122 is provided in the groove bottom wall 1213 of the accommodating groove 121, and the conductive portion 22 has a first extension portion 221, the first extension portion 221 extends from the through hole 122 and is provided in close contact with the groove bottom wall 1213 of the accommodating groove 121 at a position close to the first groove side wall 1211.

[0106] In the above technical solution, the first extension portion 221 of the conductive portion 22 is provided in close contact with the first groove side wall 1211 of the groove bottom wall 1213 of the housing groove 121, thereby increasing the contact area between the conductive portion 22 and the pole column 12, improving the weldability of the conductive portion 22 and the pole column 12. At the same time, it reduces the outflow of metal from the welding pool, ensuring that the welding pool is filled with metal, which helps to improve the stability of the electrical connection between the conductive portion 22 and the pole column 12.

[0107] The protective member 3 is housed in the housing groove 121 and covers the first extension portion 221. The housing groove 121 restricts the position of the protective member 3 and improves the mounting reliability and stability of the protective member 3, thereby allowing the protective member 3 to fully exert its protective, position-restricting, and dustproof effects, improving the connection stability between the conductive portion 22 and the pole column 12, and further improving the reliability of the battery cell 10. On the other hand, since the protective member 3 does not occupy space in the height direction of the pole column 12, it helps to improve the space utilization rate within the pole column 12.

[0108] Referring further to Figure 15, which is a cross-sectional view of the pole 12, conductive portion 22, protective member 3, etc. of a battery cell 10 provided in some embodiments of the present application. There is one through hole 122, and the conductive portion 22 further has a second extension 222, that is, the conductive portion 22 has a first extension 221 and a second extension 222, both of which extend from the through hole 122, the first extension 221 being provided in close contact with the first groove side wall 1211 of the groove bottom wall 1213 of the housing groove 121, and the second extension 222 being provided in close contact with the second groove side wall 1212 of the groove bottom wall 1213 of the housing groove 121.

[0109] In the above technical solution, the conductive portion 22 is divided into at least a first extension portion 221 and a second extension portion 222, and the first extension portion 221 and the second extension portion 222 are brought into close contact with different positions on the groove bottom wall 1213, making it easier to bend the first extension portion 221 and the second extension portion 222 toward the second side of the pole column 12, thereby making it easier to connect the first extension portion 221 and the second extension portion 222 to the pole column 12, and consequently, the first extension portion 221 and the second extension portion The connection between the protruding portion 222 and the protective member 3, for example, the welding of the first extension portion 221 and the second extension portion 222 to the pole column 12, can be made more convenient. Furthermore, it can reduce welding power, reduce heat input, minimize crack defects, improve the welding reliability of the conductive portion 22 and the pole column 12, and reduce the thickness of the conductive portion 22 on the second side of the pole column 12, thereby reducing the space occupied by the conductive portion 22 in the height direction within the pole column 12.

[0110] The protective member 3 is housed in the housing groove 121 and covers the first extension portion 221 and the second extension portion 222. The housing groove 121 restricts the position of the protective member 3, improving the mounting reliability and stability of the protective member 3, allowing the protective member 3 to fully exert its protective, position-restricting, and dustproof effects, improving the connection stability between the conductive portion 22 and the pole column 12, and further improving the reliability of the battery cell 10. On the other hand, since the protective member 3 does not occupy space in the height direction of the pole column 12, it helps to improve the space utilization rate within the pole column 12.

[0111] Further referring to Figure 16, which is a cross-sectional view of the pole 12, conductive portion 22, protective member 3, etc., of a battery cell 10 provided in other embodiments of this application. There is one through hole 122, and the conductive portion 22 has a first extension 221 and a second extension 222.

[0112] Specifically, the second extension 222 and the first extension 221 extend from the same through hole 122. The first extension 221 is provided in close contact with the first groove side wall 1211 of the groove bottom wall 1213 of the housing groove 121, and the first extension 221, the protective member 3, and the pole column 12 form a single first weld mark 23 by welding, which penetrates the protective member 3 and the conductive part 22 and extends into the pole column 12. The second extension 222 is provided in close contact with the second groove side wall 1212 of the groove bottom wall 1213 of the housing groove 121, and the second extension 222, the protective member 3, and the pole column 12 form another first weld mark 23 by welding, which penetrates the protective member 3 and the conductive part 22 and extends into the pole column 12.

[0113] Further referring to Figures 17 and 18, Figure 17 is a cross-sectional view of the pole 12, conductive portion 22, protective member 3, etc. of a battery cell 10 provided in several other embodiments of this application, and Figure 18 is a cross-sectional view of the pole 12, conductive portion 22, protective member 3, etc. of a battery cell 10 provided in several other embodiments of this application. The protective member 3 has two avoidance holes 301 and one through hole 122, and the conductive portion 22 has a first extension 221 and a second extension 222.

[0114] Specifically, both the second extension 222 and the first extension 221 extend from the same through hole 122. The first extension 221 is provided in close contact with the first groove side wall 1211 of the groove bottom wall 1213 of the housing groove 121, and the first extension 221, the protective member 3, and the pole column 12 are welded together to form one first weld mark 23 in one of the avoidance holes 301. The second extension 222 is provided in close contact with the second groove side wall 1212 of the groove bottom wall 1213 of the housing groove 121, and the second extension 222, the protective member 3, and the pole column 12 are welded together to form another first weld mark 23 in the other avoidance hole 301.

[0115] In some embodiments, there are multiple through holes 122, and the conductive portion 22 has multiple extensions 220, each of which extends from one of the multiple through holes 122 and is provided in close contact with the bottom wall 1213 of the housing groove 121.

[0116] The following description will be based on the example of a case where there are two through-holes 122 and two extensions 220 of the conductive portion 22. Referring further to Figures 19 and 20, Figure 19 is a cross-sectional view of the pole 12, conductive portion 22, protective member 3, etc. of a battery cell 10 provided in some embodiments of this application, and Figure 20 is a cross-sectional view of the pole 12, conductive portion 22, protective member 3, etc. of a battery cell 10 provided in other embodiments of this application. There are two through-holes 122 in the pole 12, and the conductive portion 22 has a first extension 221 and a second extension 222.

[0117] The first extension 221 and the second extension 222 each extend from two through holes 122, and the first extension 221 and the second extension 222 extending from the two through holes 122 may extend toward each other. The first extension 221 and the second extension 222 may be arranged opposite each other without overlapping, or they may be arranged so that at least a part of them overlap. Both the first extension 221 and the second extension 222 form a single first weld mark 23 by welding to the protective member 3 and the pole column 12. Of course, the first extension 221 and the second extension 222 extending from the two through holes 122 may extend toward each other. Both the first extension 221 and the second extension 222 form two first weld marks 23 by welding to the protective member 3 and the pole column 12.

[0118] Referring further to Figure 21, which is a cross-sectional view of the pole 12, conductive portion 22, protective member 3, etc. of a battery cell 10 provided in several other embodiments of this application. The protective member 3, conductive portion 22, first extension portion 221 and second extension portion 222, and pole 12 are connected by welding to form a first weld mark 23, and the edge of the protective member 3 and the pole 12 are connected by welding to form a second weld mark 24.

[0119] Referring further to Figures 22 and 23, Figure 22 is a cross-sectional view of the pole 12, conductive part 22, protective member 3, etc. of a battery cell 10 provided in some embodiments of this application, and Figure 23 is a cross-sectional view of the pole 12, conductive part 22, protective member 3, etc. of a battery cell 10 provided in another embodiment of this application. One avoidance hole 301 is provided in the middle of the protective member 3.

[0120] Specifically, the first extension portion 221 and the second extension portion 222 each extend from two through holes 122, and the first extension portion 221 and the second extension portion 222 extending from the two through holes 122 may extend toward each other. The first extension portion 221 and the second extension portion 222 may be provided so as to partially overlap. Both the first extension portion 221 and the second extension portion 222 are welded to the protective member 3 and pole column 12 to form a single first weld mark 23 at the original position of the avoidance hole 301.

[0121] Further referring to Figure 24, which is a cross-sectional view of the pole post 12, conductive portion 22, protective member 3, etc. of a battery cell 10 provided in several other embodiments of this application. The protective member 3, conductive portion 22, first extension 221, second extension 222 and pole post 12 are connected by welding to form a first weld mark 23 at the original position of the avoidance hole 301, and the edge of the protective member 3 and the pole post 12 are connected by welding to form a second weld mark 24.

[0122] In an embodiment in which the first extension portion 221 and the second extension portion 222 are arranged opposite each other so as not to overlap, one or two avoidance holes 301 may be provided in the middle of the protective member 3. The first weld mark 23 may be formed at the original position of the avoidance hole 301, thereby connecting the protective member 3 to the first extension portion 221 and / or the second extension portion 222 of the conductive portion 22 and the pole column 12.

[0123] In the above technical solution, multiple through holes 122 are provided, and the conductive portion 22 has multiple extensions 220. This allows each of the multiple extensions 220 of the conductive portion 22 to pass through the multiple through holes 122. As a result, the thickness of each extension 220 is reduced, each extension 220 is easier to bend toward the second side of the pole column 12, the connection between the extension 220 and the pole column 12 becomes more convenient, and the space occupied by the conductive portion 22 in the height direction within the pole column 12 can be further reduced.

[0124] The protective member 3 is housed within the housing groove 121 and covers all of the extensions 220. The housing groove 121 restricts the position of the protective member 3, improving the mounting reliability and stability of the protective member 3, allowing the protective member 3 to fully exert its protective, position-restricting, and dustproof effects, improving the connection stability between the conductive part 22 and the pole column 12, and further improving the reliability of the battery cell 10. On the other hand, since the protective member 3 does not occupy space in the height direction of the pole column 12, it helps to improve the space utilization rate within the pole column 12.

[0125] Referring further to Figure 25, which is a schematic diagram of a partial structure of a battery cell 10 provided in some embodiments of the present application. In embodiments of the present application, the battery cell 10 further includes a cover plate 13 into which the poles 12 are fitted, closing the groove opening of the housing groove 121, and the cover plate 13 and the poles 12 are electrically connected.

[0126] In the above technical solution, by providing a cover plate 13 that closes the groove opening of the housing groove 121, the probability of electrolyte in the case 11 leaking from the groove opening of the housing groove 121 can be reduced. Furthermore, since the cover plate 13 closes the groove opening of the housing groove 121 and is electrically connected to the pole column 12, the cover plate 13 can easily realize an indirect electrical connection between the pole column 12 and the busbar member, which helps to increase the connection area of ​​the electrical connection and helps to reduce the resistance of the electrical connection.

[0127] Furthermore, as long as the groove opening of the housing groove 121 can be closed by the cover plate 13, the fitting method and fitting position of the cover plate 13 and the pole post 12 are not limited. For example, in some embodiments, the cover plate 13 and the pole post 12 may be welded together. During processing, the conductive part 22 is first passed through the through hole 122 and welded to the groove wall of the housing groove 121, and then the groove opening of the housing groove 121 is closed by welding the cover plate 13 and the pole post 12 together.

[0128] Furthermore, the specific configuration of the cover plate 13 is not limited. For example, in some selective embodiments, referring to Figure 25, the cover plate 13 has a first conductive member 131 and a second conductive member 132 made of different materials, the first conductive member 131 and the pole 12 are fitted together and electrically connected, and the second conductive member 132 and the first conductive member 131 are fitted together and electrically connected.

[0129] In the above technical solution, by making the cover plate 13 a composite and making the first conductive member 131 of the same material as the pole column 12, the electrical connection between the first conductive member 131 and the pole column 12 is enhanced, and a reliable and stable connection between the first conductive member 131 and the pole column 12 can be easily achieved by welding. Furthermore, since the second conductive member 132 and the first conductive member 131 are made of different materials, the second conductive member 132 can easily enable electrical connection with busbar members made of different materials than the pole column 12, and a reliable and stable connection between the second conductive member 132 and busbar members made of the same material as the second conductive member 132 can be easily achieved by welding.

[0130] For example, if pole 12 is a negative pole pole 12, pole 12 is a copper pole, and the busbar member is an aluminum sheet, the first conductive member 131 may be made of copper and the second conductive member 132 may be made of aluminum. In this case, the pole 12 and the first conductive member 131 are made of the same material and can be effectively welded, and the second conductive member 132 and the busbar member are made of the same material and can be effectively welded, thereby effectively realizing an indirect electrical connection between the pole 12 and the busbar member via the cover plate 13. Furthermore, since the pole 12 and the first conductive member 131 are welded together from copper, the fluidity is good, cracks are less likely to occur, and this helps to improve the sealing effect of the welded joint.

[0131] Referring again to Figure 25, in some selective examples, the first conductive member 131 is located between the housing groove 121 and the second conductive member 132. In the above technical solution, because the first conductive member 131 is located between the housing groove 121 and the second conductive member 132, the housing groove 121 and the second conductive member 132 can be separated. Even if the electrolyte in the case 11 enters the housing groove 121 through the through hole 122, the first conductive member 131 prevents the electrolyte in that portion from coming into contact with the second conductive member 132, thereby solving the problem of corrosion of the second conductive member 132 by the electrolyte.

[0132] The method of fitting the first conductive member 131 and the second conductive member 132 is not limited. For example, in some embodiments, referring to Figure 25, the first conductive member 131 has a groove 1311, the second conductive member 132 is fitted into the groove 1311, and the groove opening of the groove 1311 is formed on the surface of the first conductive member 131 away from the housing groove 121, so that the second conductive member 132 is exposed from the groove opening of the groove 1311. Alternatively, in other embodiments, the first conductive member 131 and the second conductive member 132 may be connected by crimping, engagement, or the like.

[0133] Furthermore, for the second conductive member 132 to be "exposed" from the groove opening of the groove 1311, it is sufficient that the first conductive member 131 does not shield the second conductive member 132 at the groove opening of the groove 1311, and the second conductive member 132 does not necessarily have to protrude from the groove opening of the groove 1311. For example, the second conductive member 132 may be aligned with the surface of the first conductive member 131 on the side away from the housing groove 121, or the second conductive member 132 may protrude from the surface of the first conductive member 131 on the side away from the housing groove 121.

[0134] In the above technical solution, by fitting the second conductive member 132 into the first conductive member 131, the difficulty of mounting the first conductive member 131 and the second conductive member 132 can be reduced, the stability and convenience of fitting the first conductive member 131 and the second conductive member 132 can be improved, the thickness of the cover plate 13 can be reduced, the space occupied by the cover plate 13 can be reduced, and the space utilization rate of the battery cell 10 can be improved. On the other hand, since the second conductive member 132 can be exposed from the surface of the first conductive member 131 away from the housing groove 121 through the groove opening of the recess 1311, it is useful for electrical connection between the second conductive member 132 and the busbar member outside the pole column 12.

[0135] Furthermore, the fact that the groove opening of the recessed groove 1311 is formed on the surface of the first conductive member 131 away from the housing groove 121 means that the recessed groove 1311 opens away from the active material coated portion 21. As a result, the groove wall portion that defines the recessed groove 1311 of the first conductive member 131 is located between the housing groove 121 and the second conductive member 132, separating the housing groove 121 and the second conductive member 132, preventing contact between the electrolyte that has entered the recessed groove 1311 and the second conductive member 132, and reducing electrolyte leakage.

[0136] Of course, in other embodiments, the cover plate 13 does not have to be a composite made of different materials. For example, in other embodiments of this application, the entire cover plate 13 may be a non-composite made of the same material as, for example, the positive pole column 12, and this will not be repeated here.

[0137] Referring again to Figure 25, the cover plate 13 is further fitted into the groove opening of the housing groove 121. In the above technical solution, fitting the cover plate 13 into the housing groove 121 reduces the difficulty of mounting the cover plate 13 and the pole post 12, improves the mounting stability, connection reliability and convenience of the cover plate 13 and the pole post 12, and reduces the space occupied by the cover plate 13 outside the pole post 12. Furthermore, since the cover plate 13 is fitted into the groove opening of the housing groove 121, sufficient space can be secured inside the housing groove 121 to accommodate the conductive part 22.

[0138] Of course, in other embodiments of this application, the method of fitting the cover plate 13 and the pole post 12 is not limited to fitting them into the housing groove 121. The cover plate 13 may directly cover the pole post 12 from the outside, that is, it may be provided so as to directly cover the groove opening of the housing groove 121. In this embodiment, there are no particular limitations as long as it contributes to fitting with the busbar member of the battery 100.

[0139] In some embodiments, at least one pole post 12 is provided on the case cover 112. For example, all pole posts 12 may be provided on the case cover 112. For example, one pole post 12 may be provided on the case cover 112 and the remaining pole posts 12 may be provided on the case body 111. Since the size of the case cover 112 is relatively small, the size of the mold or jig can be reduced, which helps to reduce costs.

[0140] In another embodiment, at least one pole 12 is provided on a wall that is provided opposite the opening 1110 of the case body 111. In this way, the electrode assembly 2 enters the case body 111 along the opening 1110, the conductive part 22 faces the pole 12 directly, making it easier to connect the conductive part 22 and the pole 12, and improving the mounting efficiency of the battery cell 10.

[0141] Referring again to Figure 2, according to some embodiments of the present application, the present application further provides a battery 100 including a battery cell 10 as described in any of the above solutions.

[0142] In the technical solution of the embodiment of this application, by using the above-mentioned battery cell 10, problems such as ignition and explosion of the battery 100 can be reduced, which helps to improve the performance and reliability of the battery 100.

[0143] Referring again to Figure 1, according to some embodiments of the present application, the present application further provides an electrical device 1000 including a battery 100 described above for providing electrical energy to the electrical device 1000.

[0144] The electrical device 1000 is one of the aforementioned facilities or systems that use the battery 100.

[0145] In the technical solution of the embodiment of this application, by using the above-mentioned battery 100, problems such as ignition and explosion can be reduced, which helps to improve the performance and reliability of the vehicle.

[0146] Referring further to Figure 26, which is a flowchart of a method for manufacturing a battery cell 10 according to some embodiments of this application, the present application provides a method for manufacturing a battery cell 10, comprising the steps of: providing a case, an electrode assembly, and a protective member; incorporating the electrode assembly into the case and allowing at least a portion of the conductive part of the electrode assembly to pass through through holes for the electrode posts in the case; providing at least a portion of the protective member at one end of the electrode post away from the inside of the case so as to cover the through holes; and connecting the conductive part and the electrode post.

[0147] The pole post 12 and the conductive part 22 may be fixed by welding and electrically connected. Of course, the pole post 12 and the conductive part 22 may also be fixed and electrically connected by conductive adhesive or conductive screws.

[0148] In the technical solution of the embodiment of this application, by providing at least a portion of the protective member 3 on the side of the conductive part 22 away from the electrode assembly 2, and covering the through hole 122 in the pole column 12 with the protective member 3, the probability of foreign matter entering the case 11 of the battery cell 10 from the through hole 122 is reduced, the probability of a short circuit occurring inside the battery 100 is reduced, problems such as ignition and explosion of the battery 100 are reduced, and it is possible to improve the performance and reliability of the battery cell 10. At the same time, at least a portion of the conductive part 22 is protected, exhibiting position restriction and dustproof effects, improving the connection stability between the conductive part 22 and the pole column 12, and further improving the reliability of the battery cell 10.

[0149] In some embodiments, when connecting the conductive part 22 and the pole column 12, at least one of the conductive part 22 and the pole column 12 is connected to the protective member 3. For example, the protective member 3, the conductive part 22, and the pole column 12 are connected by welding to form a first weld mark 23, which extends sequentially from the protective member 3 into the conductive part 22 and the pole column 12. Alternatively, for example, the conductive part 22 and the pole column 12 are connected by welding to form a first weld mark 23, and the edge of the protective member 3 and the pole column 12 are connected by welding to form a second weld mark 24.

[0150] Of course, the method of connecting the protective member 3 and the conductive part 22 or pole column 12 is not limited to welding, but may also be achieved by methods such as bonding, interlocking, or fastening.

[0151] In the above technical solution, by connecting at least one of the conductive part 22 and the pole column 12 to the protective member 3, the protective member 3 is fixed in place, reducing rattle of the protective member 3, improving the mounting stability of the protective member 3, allowing the protective member 3 to fully exert its protective and dustproof effects, and further improving the welding stability of the conductive part 22 and the pole column 12. On the other hand, by using the protective member 3 to hold down the conductive part 22 instead of the welding nose of the conventional technology, the size of the pole column 12 and the conductive part 22 can be appropriately reduced, thereby reducing costs.

[0152] Referring further to Figures 7-9 and 12-14, the method for manufacturing the battery cell 10 further includes the step of positioning a plurality of retaining bars 6 on the side of the protective member 3 away from the poles 12, before connecting the conductive portion 22 to the pole posts 12. For example, at least four retaining bars 6 may be positioned close to the edge of the protective member 3 to hold down the protective member 3, thereby holding down the conductive portion 22.

[0153] Specifically, in an embodiment in which the conductive part 22 and the pole column 12 are connected by welding, multiple retaining bars 6 are placed instead of the welding nose in the conventional technology. The position of the retaining bars 6 must be such that it avoids the welding marks between the conductive part 22 and the pole column 12. This reduces the impact of the accumulation of welding slag and eliminates the cost of the welding nose. Furthermore, because there is extra space inside the pole column 12, the inner width of the pole column 12 and the length of the conductive part 22 can be reduced accordingly, further reducing costs.

[0154] Therefore, in the above technical solution, by pressing the protective member 3 with multiple retaining bars 6, the protective member 3 is brought into close contact with the conductive part 22, the position of the conductive part 22 is restricted by the protective member 3, and the reliability and stability of the connection between the conductive part 22 and the pole column 12 can be improved.

[0155] Finally, it should be noted that the embodiments described above are used solely to illustrate the technical solutions of this application and are not limiting. While this application has been described in detail with reference to the embodiments described above, those skilled in the art should understand that they may modify the technical solutions described in the embodiments above, or make equivalent substitutions to some or all of their technical features, and that such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and will all be included within the scope of the claims and specification of this application. In particular, any technical features described in each embodiment can be combined in any way, provided there is no structural inconsistency. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the claims. [Explanation of symbols]

[0156] 1000 Electrical equipment 100 batteries 200 controllers 300 motor Z 1st direction X 2nd direction Y Third direction R pole column axis 10 battery cells 101 Boxes 1011 Part 1 1012 Part 2 11 cases 111 Case body 1110 Aperture 112 Case Cover 12 Polar Pillar 121 Retaining groove 1211 First trench side wall 1212 Second trench side wall 1213 Groove bottom wall 122 Through hole 123 Outer end surface of pole column 124 Inner end face of pole column 13 Cover Plate 131 First conductive member 1311 Recessed groove 132 Second conductive member 2 electrode assembly 21 Active material coated section 22 Conductive part 220 Extension part 221 1st extension part 222 Second extension part 23. First weld mark 231 First weld bead 232 Second weld bead 233 Third weld bead 24. Second weld mark 3. Protective component 301 Avoidance Hole 302-seat capacity 31 Protective Sheets 32 Convex part 4. Explosion-proof valve 6. Retaining bar

Claims

1. A case provided with pole columns, wherein the pole columns have a first side and a second side that are opposite each other in the height direction, the first side is positioned to face the inside of the case, and the pole columns are provided with through holes that penetrate the first side and the second side, An electrode assembly provided within the case, including an active material coated portion and a conductive portion connected to the active material coated portion, wherein at least a portion of the conductive portion penetrates from the first side to the second side through the through hole, A protective member is provided on the side of the conductive part away from the electrode assembly and covers the through hole, at least a portion of which is provided. Battery cell.

2. The conductive part and the pole column are connected by welding to form a first weld mark, and the first weld mark is positioned offset from the through hole. The battery cell according to claim 1.

3. The protective member is connected to the conductive part and the pole column by welding, and the first weld marks extend sequentially from the protective member to the conductive part and the inside of the pole column. The battery cell according to claim 2.

4. The first weld mark includes one weld bead, or the first weld mark includes a first weld bead, a second weld bead, and a third weld bead, wherein in the width direction of the first weld bead, the second weld bead and the third weld bead are located on opposite sides of the first weld bead. The battery cell according to claim 2.

5. The protective member is fixedly connected to the conductive part or the pole column. A battery cell according to any one of claims 1 to 4.

6. The protective member and the conductive part or the pole column are connected by welding to form a second weld mark. The battery cell according to claim 5.

7. The protective member has a relief hole, the relief hole is positioned offset from the through hole, and the first weld mark is provided in the relief hole and extends through the conductive part into the pole column. A battery cell according to any one of claims 2 to 4.

8. The avoidance hole is an avoidance through via, and the first weld mark extends into the avoidance through via and is connected to the hole wall of the avoidance through via. The battery cell according to claim 7.

9. The avoidance hole is an avoidance bright via, and the first weld mark is provided in the avoidance bright via and extends sequentially through the bottom wall of the avoidance bright via, the conductive part, and into the pole column. The battery cell according to claim 7.

10. The width of the aforementioned avoidance hole is 0.2 mm to 1.2 mm. A battery cell according to any one of claims 7 to 9.

11. The width of the aforementioned avoidance hole is 0.4 mm to 1 mm. The battery cell according to claim 10.

12. The protective member is A protective sheet provided on the second side and in close contact with the conductive part, The protective sheet has a protrusion on the side facing the second side that contacts the pole column, including, A battery cell according to any one of claims 1 to 11.

13. The aforementioned protrusion extends along the circumferential direction of the protective sheet. The battery cell according to claim 12.

14. At least a portion of the protrusion between the end of the protrusion away from the protective sheet and the second side has a gap for connecting the spaces on both sides of the protective sheet, or the protrusion is provided with a communication opening for connecting the spaces on both sides in the thickness direction of the protective sheet. The battery cell according to claim 12 or 13.

15. The surface of the pole column away from the active material coating portion is the outer end surface of the pole column, and a accommodating groove is provided on the surface of the pole column away from the active material coating portion, with the groove opening of the accommodating groove formed on the outer end surface of the pole column. The housing groove communicates with the inside of the case through a through hole, and the conductive part is inserted through the through hole and at least a portion of it is housed within the housing groove. A battery cell according to any one of claims 1 to 14.

16. The receiving groove has a first groove side wall and a second groove side wall that are arranged opposite each other in the width direction, and the through hole is provided in the groove bottom wall of the receiving groove. The conductive portion has a first extension, which extends from the through hole and is provided in close contact with the groove bottom wall of the housing groove at a position close to the first groove side wall. The battery cell according to claim 15.

17. The protective member is housed in the housing groove and covers the first extension. The battery cell according to claim 16.

18. The number of through holes is one, and the conductive portion further has a second extension, the second extension and the first extension extending from the through hole, and the second extension is provided in close contact with the groove bottom wall of the housing groove at a position close to the second groove side wall. The battery cell according to claim 16.

19. The protective member is housed in the housing groove and covers the first extension and the second extension. The battery cell according to claim 18.

20. The number of through holes is multiple, and the conductive portion has multiple extensions, each of which extends from the multiple through holes and is provided in close contact with the bottom wall of the receiving groove. The battery cell according to claim 15.

21. The protective member is housed in the housing groove and covers all of the extensions. The battery cell according to claim 20.

22. The case comprises a case cover and a case body having an opening, the case cover covering the opening, and at least one pole is provided on the case cover, or at least one pole is provided on a wall of the case body facing the opening. A battery cell according to any one of claims 1 to 21.

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

24. The battery comprises the battery described in claim 23. Electrical device.

25. The steps include providing a case, an electrode assembly, and a protective member, The steps include: incorporating the electrode assembly into the case and allowing at least a portion of the conductive part of the electrode assembly to pass through the through-hole of the electrode column in the case; The steps include providing at least a portion of the protective member at one end of the pole column away from the inside of the case so as to cover the through hole, The steps include connecting the conductive part to the pole column, including, A method for manufacturing battery cells.

26. In the step of connecting the conductive part and the pole column, at least one of the conductive part and the pole column is connected to the protective member. A method for manufacturing a battery cell according to claim 25.

27. Before the step of connecting the conductive part to the pole column, The further step includes arranging a plurality of retaining bars on the side of the protective member away from the pole column to press down on the protective member, thereby pressing down on the conductive portion with the protective member. A method for manufacturing a battery cell according to claim 25 or 26.

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