Battery monomer, battery and electric device

Abstract

The invention discloses a single battery, a battery and a power utilization device, the single battery comprises: a shell assembly, the shell assembly comprises a shell and a pole, the shell has a first wall, the first wall is provided with a through hole, the pole penetrates through the through hole, the pole is provided with a via hole, and the via hole penetrates through the pole to communicate the inner side and the outer side of the shell; the electrode assembly is arranged in the shell, the electrode assembly is provided with a conductive part, the conductive part is arranged in the through hole in a penetrating mode, a first connecting part is formed between the conductive part and the through hole, and the first connecting part seals the through hole. The conductive part penetrates through the via hole of the pole, the via hole can play a role in containing the conductive part, the size of the conductive part on the inner side of the shell is reduced, the available space of the electrode assembly in the shell is increased, the size of the electrode assembly is increased, and the first connecting part formed between the conductive part and the via hole can play a role in sealing the via hole; other parts for sealing the via holes are not needed, the number of parts of the battery monomer can be reduced, the manufacturing process is simplified, and the energy density of the battery monomer is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a box and multiple battery cells contained in the box. At present, in order to improve the energy storage capacity of the battery, how to improve the energy density of the battery cell has become a problem that needs to be solved urgently. Summary of the invention

[0003] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can effectively increase the energy density of the battery cell, thereby facilitating improving the energy storage capacity of the battery.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a shell assembly, the shell assembly comprising an outer shell and an electrode, the outer shell having a first wall, the first wall being provided with a through hole, the electrode being passed through the through hole, the electrode being provided with a via hole, the via hole penetrating the electrode to connect the inner and outer sides of the outer shell; an electrode assembly, the electrode assembly being arranged in the outer shell, the electrode assembly having a conductive part, the conductive part being passed through the via hole, and a first connecting part being formed between the conductive part and the via hole, and the first connecting part sealing the via hole.

[0005] In the above technical solution, the pole is installed on the first wall of the shell through the through hole, and the electrode assembly is installed on the pole through the through hole of the conductive part through the pole. On the one hand, the through hole can accommodate the conductive part, reduce the volume occupied by the conductive part on the inner side of the shell, and increase the available space of the electrode assembly in the shell, which is conducive to increasing the size of the electrode assembly and improving the energy density of the battery cell. On the other hand, the first connecting part formed between the conductive part and the through hole can seal the through hole, and no other parts need to be set up to seal the through hole, thereby reducing the number of parts of the battery cell, simplifying the manufacturing process of the battery cell, reducing weight, reducing costs, and further improving the energy density of the battery cell. Moreover, since the conductive part is passed through the through hole, the installation between the conductive part and the pole is relatively reliable, which can reduce the probability of the conductive part and the pole falling off, and improve the reliability of the battery cell.

[0006] In some embodiments of the present application, the housing has a first direction and a second direction, the first direction and the second direction intersect and are parallel to the first wall, and a size of the via in the first direction is greater than a size of the via in the second direction.

[0007] In the above technical solution, by setting the via hole to have a size in the first direction larger than the size in the second direction, the via hole can be a strip-shaped hole or a long and narrow slit, and the cross-section of the conductive part can also be a strip or a long and narrow shape. On the one hand, it can increase the connection surface between the conductive part and the via hole and improve the connection reliability between the conductive part and the pole. On the other hand, it is beneficial to increase the surface area of ​​the conductive part, reduce the internal resistance of the conductive part, and thereby increase the current density of the conductive part.

[0008] In some embodiments of the present application, in the first direction, the size of the conductive portion is less than or equal to the size of the via hole.

[0009] In the above technical solution, in the first direction, the size of the conductive part can be smaller than the size of the via hole, so that a gap can be formed between the conductive part and the via hole, and the gap is conducive to the installation of the conductive part into the via hole, thereby improving the installation success rate of the conductive part. In the first direction, the size of the conductive part can also be equal to the size of the via hole, so that there can be no gap between the conductive part and the via hole, which can make the conductive part and the via hole fit tightly and is conducive to improving the sealing between the conductive part and the via hole.

[0010] In some embodiments of the present application, in the first direction, the size of the conductive portion is L1, and the size of the via hole is L2, wherein 0mm≤L2-L1≤4mm.

[0011] In the above technical solution, by setting the difference between the size L1 of the conductive part and the size L2 of the via in the first direction within the range of 0mm to 4mm, there can be no gap or a relatively small gap between the conductive part and the hole wall of the via in the first direction. On the one hand, the sealing between the conductive part and the via can be improved in the case of no gap. On the other hand, the installation difficulty between the conductive part and the via can be reduced in the case of a small gap, and the probability of damage to the conductive part during installation or disassembly can be reduced, which is beneficial to reducing the probability of sealing failure between the conductive part and the via.

[0012] In some embodiments of the present application, in the first direction, a size of the first connecting portion is larger than a size of the via hole.

[0013] In the above technical solution, the first connecting portion can cover the via hole in the first direction, thereby achieving a better sealing effect and reducing the probability of poor sealing between the via hole and the conductive portion.

[0014] In some embodiments of the present application, in the second direction, the size of the conductive portion is less than or equal to the size of the via hole.

[0015] In the above technical solution, in the second direction, the size of the conductive part can be smaller than the size of the via hole, so that there can be a gap between the conductive part and the via hole, which facilitates the installation of the conductive part into the via hole and improves the installation success rate of the conductive part. In the second direction, the size of the conductive part can also be equal to the size of the via hole, so that there can be no gap between the conductive part and the via hole, which can make the conductive part and the via hole fit tightly, which is conducive to improving the sealing between the conductive part and the via hole.

[0016] In some embodiments of the present application, in the second direction, the size of the conductive portion is W1, and the size of the via hole is W2, wherein 0 mm ≤ W2 - W1 ≤ 0.1 mm.

[0017] In the above technical solution, by setting the difference between the size W1 of the conductive part and the size W2 of the via in the second direction within the range of 0mm to 0.1mm, there can be no gap or a relatively small gap between the conductive part and the hole wall of the via in the second direction. On the one hand, the sealing between the conductive part and the via can be improved in the case of no gap. On the other hand, the installation difficulty between the conductive part and the via can be reduced in the case of a small gap, and the probability of damage to the conductive part during installation or disassembly can be reduced, which is beneficial to reducing the probability of sealing failure between the conductive part and the via.

[0018] In some embodiments of the present application, in the second direction, a size of the first connecting portion is larger than a size of the via hole.

[0019] In the above technical solution, the first connecting portion can cover the via hole in the second direction, thereby achieving a better sealing effect and reducing the probability of poor sealing between the via hole and the conductive portion.

[0020] In some embodiments of the present application, the conductive portion has a distal end portion away from the inner side of the housing, and the distal end portion is connected to the via hole through the first connecting portion.

[0021] In the above technical solution, the conductive part is connected to the via hole through the first connecting part at the distal end. On the one hand, the first connecting part is located outside the via hole, which is convenient to form, can reduce the difficulty of connecting the conductive part and the via hole, and improve the product yield. On the other hand, the first connecting part is connected between the distal end and the via hole, which can effectively prevent impurities, large particles and other pollutants from penetrating into the via hole, reduce the pollutants in the gap formed between the conductive part and the via hole, reduce the probability of electrochemical corrosion of the conductive part and the pole, and help improve the reliability of the battery cell.

[0022] In some embodiments of the present application, the pole has a first surface, the first surface is provided with an avoidance groove, the via hole passes through the avoidance groove, and the first connecting portion is located in the avoidance groove.

[0023] In the above technical solution, the avoidance groove can accommodate the first connection part, which can reduce the volume of the assembly formed by the pole, the conductive part and the first connection part, which is conducive to saving space. On the other hand, by providing the avoidance groove, the weight of the pole can be reduced, which can improve the energy density of the battery cell.

[0024] In some embodiments of the present application, the first connecting portion has an outer contour surface facing the outside of the avoidance groove, and the outer contour surface does not protrude from the first surface.

[0025] In the above technical solution, by setting the outer contour surface of the first connecting part not to protrude from the first surface, the probability of the first surface being a plane can be increased. When the pole is connected to the adapter through the first surface, the pole and the adapter can be stopped face to face, which is beneficial to improve the connection reliability between the pole and the adapter and improve the reliability of the battery cell.

[0026] In some embodiments of the present application, the housing has a third direction, the third direction is perpendicular to the first wall, and in the third direction, a size of the avoidance groove is H1, wherein 1 mm≤H1.

[0027] In the above technical solution, the third direction may be the depth direction of the avoidance groove, the conductive part and the pole may be connected by welding, and the height of the welded fusion part is generally less than 1 mm. By setting the dimension H1 of the avoidance groove in the third direction to be greater than or equal to 1 mm, the avoidance groove can accommodate a larger volume of the first connection part and can increase the probability of fully accommodating the first connection part. Secondly, the dimension H1 of the avoidance groove is greater than or equal to 1 mm, which can further reduce the weight of the pole and improve the energy density of the battery cell.

[0028] In some embodiments of the present application, the pole has a first surface, the via hole passes through the first surface, the first connecting portion protrudes from the first surface, the pole is used to connect the adapter, and the end of the adapter facing the first surface is provided with a receiving portion, and the first connecting portion is at least partially located in the receiving portion.

[0029] In the above technical solution, the first connection part can protrude from the first surface. In this case, the first connection part can be free of obstructions around it, so it is easier to form the first connection part, which can improve the forming probability of the first connection part. The accommodating part of the adapter can accommodate the first connection part, so that the assembly formed by the pole, the conductive part and the adapter is relatively small, and the weight can be reduced, thereby improving the energy density of the battery cell.

[0030] In some embodiments of the present application, the pole has a first surface, the via hole penetrates the first surface, and the first connecting portion has an outer contour surface facing the outside of the pole, and the outer contour surface is flush with the first surface.

[0031] In the above technical solution, by setting the outer contour surface of the first connecting part and the first surface of the pole to be flush, when the pole is connected to the adapter through the first surface, the connection between the pole and the adapter can be made tighter, which is beneficial to improving the connection reliability between the pole and the adapter.

[0032] In some embodiments of the present application, the via hole is formed with a first hole on the outside of the pole and a second hole on the inside of the pole, and the projection of the first hole on the first wall and the projection of the second hole on the first wall do not overlap.

[0033] In the above technical solution, by making the projections of the first and second openings of the through hole on the first wall non-overlapping, the impact of the first connecting portion on the internal environment of the shell and the electrode assembly during the molding process can be effectively reduced, thereby improving the safety of the internal environment of the shell and the electrode assembly.

[0034] In some embodiments of the present application, the via hole has a hole center axis, and the hole center axis is inclined relative to the first wall.

[0035] In the above technical solution, the axis of the via hole is inclined relative to the first wall, that is, the via hole is an inclined hole arranged relative to the first wall. This can reduce the impact of the first connecting part on the internal environment of the shell and the electrode assembly during the molding process, and at the same time increase the manufacturability of the via hole, which is beneficial to improving the product yield of the pole during the manufacturing process.

[0036] In some embodiments of the present application, the angle between the center axis of the hole and the first wall is α, wherein 45 degrees ≤ α ≤ 90 degrees.

[0037] In the above technical solution, if the angle α between the axis of the hole and the first wall is less than 45 degrees, the width of the pole will be relatively large, increasing the material consumption and also increasing the difficulty of manufacturing the pole; if the angle α between the axis of the hole and the first wall is greater than 90 degrees, the offset distance between the first orifice and the second orifice is relatively small, which is not conducive to reducing the impact of the first connecting part on the internal environment of the shell and the electrode assembly during the molding process.

[0038] In some embodiments of the present application, a guide opening is formed between the inner side of the pole and the through hole, and the width of the guide opening gradually decreases in a direction from the inner side of the pole to the outer side of the pole.

[0039] In the above technical solution, since the width of the guide opening gradually decreases in the direction from the inside of the pole to the outside of the pole, and the initial width of the guide opening is greater than the width of the via hole, the conductive part can relatively easily enter the guide opening first during the process of being installed in the via hole, and can be easily inserted into the via hole under the guiding action of the guide opening. In this way, the resistance of the conductive part when passing through the via hole can be reduced, the damage to the conductive part can be reduced, and the installation efficiency of the conductive part can be improved.

[0040] In some embodiments of the present application, the pole includes: a column portion, the column portion is passed through a through hole; a first plate portion and a second plate portion, the first plate portion and the second plate portion are vertically connected to the column portion, the first plate portion is located on the outside of the shell, and the second plate portion is located on the inside of the shell; wherein the through hole passes through the first plate portion, the column portion and the second plate portion.

[0041] In the above technical solution, by configuring the pole to include a column portion, a first plate portion, and a second plate portion, the pole can be in an I-shaped structure, and the first plate portion and the second plate portion are located on both sides of the shell, which can reduce the probability of the pole being separated from the shell and improve the installation reliability of the pole and the shell. The via hole can be formed on the first plate portion, the column portion, and the second plate portion. The accommodation space formed in the via hole is large, which can accommodate a larger volume of the conductive part, improve the connection reliability between the conductive part and the pole, and the effect of reducing the mass of the pole is better, which is conducive to improving the energy density of the battery cell.

[0042] In some embodiments of the present application, a connection area is provided on the pole, and the connection area is used to connect to the adapter, and a second connection portion is formed between the connection area and the adapter.

[0043] In the above technical solution, the pole is connected to the adapter through the connecting area, and a second connecting portion is formed between the connecting area and the adapter. In this way, the pole and the adapter can be connected without setting additional components between the two, which can reduce the number of components and thus reduce the weight of the battery cell, which is beneficial to improving the energy density of the battery cell.

[0044] In some embodiments of the present application, the housing includes a shell body and an end cover, the end cover is arranged to cover the opening of the shell body, and the shell body or the end cover forms a first wall.

[0045] In the above technical solution, the first wall can be arranged on the shell body, that is, the via hole is arranged on the shell body, and the pole is installed on the shell body. This method can simplify the structure on the end cover, reduce the number of parts on the end cover, and reduce the weight on the end cover, thereby improving the connection reliability between the end cover and the shell body. The first wall can also be arranged on the end cover, that is, the via hole is arranged on the end cover, and the pole is installed on the end cover. Since the end cover can be separated from the shell body and processed separately, the via hole can be processed while processing the end cover, which can reduce the manufacturing difficulty of the via hole and improve the processing yield of the via hole.

[0046] In a second aspect, an embodiment of the present application further provides a battery, comprising the battery cell described above.

[0047] In the above technical solution, the battery cell is provided with a via hole on the pole, the conductive part of the electrode assembly is passed through the via hole, and the via hole and the conductive part are sealed and connected through a first connecting part. This method is beneficial to reducing the number of components of the battery cell and reducing the weight of the battery cell, which can improve the energy density of the battery cell and thus improve the energy density of the battery.

[0048] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the battery cell as described above, or the battery as described above.

[0049] In the above technical solution, the use of the above battery cells or batteries can effectively improve the battery energy density, thereby increasing the working time of the electrical device and significantly improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0052] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0053] Figure 3 Schematic diagram of the local structure of a battery cell provided in some embodiments of the present application Figure 1 ;

[0054] Figure 4 Schematic diagram of the structure of the pole and the conductive part provided in some embodiments of the present application Figure 1 ;

[0055] Figure 5 Schematic diagram of the structure of the pole provided in some embodiments of the present application Figure 1 ;

[0056] Figure 6 Schematic diagram of the structure of the pole and the conductive part provided in some embodiments of the present application Figure 2 ;

[0057] Figure 7 Schematic diagram of the structure of the pole and the conductive part provided in some embodiments of the present application Figure 3 ;

[0058] Figure 8Schematic diagram of the local structure of a battery cell provided in some embodiments of the present application Figure 2 ;

[0059] Fig. 9 Schematic diagram of the structure of the pole provided in some embodiments of the present application Figure 2 ;

[0060] Fig.10 Schematic diagram of the structure of the pole provided in some embodiments of the present application Figure 3 .

[0061] icon:

[0062] 1000. Vehicles;

[0063] 100. Battery;

[0064] 10. Box body; 11. First box body; 12. Second box body;

[0065] 20. Battery cells;

[0066] 21. Shell assembly;

[0067] 211, outer shell; 2111, first wall; 2112, through hole; 2011, shell body; 2012, end cover;

[0068] 212, pole; 2121, through hole; 2121a, first opening; 2121b, second opening; 2121c, hole centerline; 2122, first surface; 2123, avoidance groove; 2124, guide opening; 2125, connection area; 2021, column portion; 2022, first plate portion; 2023, second plate portion;

[0069] 22. electrode assembly; 221. conductive portion; 2211. distal portion;

[0070] 23. First connecting portion; 23a. Outer contour surface;

[0071] 24. adapter; 24a. accommodating portion;

[0072] 25. second connecting portion; 26. sealing member;

[0073] 200, controller; 300, motor; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0074] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0075] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0076] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0077] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0078] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0079] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0080] The term "plurality" used in the present application refers to two or more (including two).

[0081] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0082] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells or multiple battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0083] The battery cell includes a shell, an electrode assembly and an electrolyte, and the shell is used to contain the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0084] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0085] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a box and multiple battery cells contained in the box. At present, in order to improve the energy storage capacity of the battery, how to improve the energy density of the battery cell has become a problem that needs to be solved urgently.

[0086] In a general battery cell structure, the negative electrode plate and the positive electrode plate are electrically connected to the pole through the tabs, and the tabs are arranged on the inner side of the outer shell. As a result, the tabs occupy a certain space, reducing the space used by the electrode assembly, and wasting the space between the electrode assembly and the tabs in the outer shell. This is not conducive to maximizing the size of the electrode assembly to utilize the space in the outer shell, and is therefore not conducive to improving the energy density of the battery cell.

[0087] Based on the above considerations, in order to solve the problem that the size of the electrode assembly cannot be maximized due to the space occupied by the pole tabs arranged inside the shell, which is not conducive to improving the energy density of the battery cell. The inventor has designed a battery cell, including a shell assembly and an electrode assembly, the shell assembly includes a shell and a pole, the shell has a first wall, the first wall is provided with a through hole, the pole is penetrated by the through hole, the pole is provided with a via hole, the via hole penetrates the pole to connect the inside and outside of the shell; the electrode assembly is arranged in the shell, the electrode assembly has a conductive part, the conductive part is penetrated by the via hole, and a first connecting part is formed between the conductive part and the via hole, and the first connecting part seals the via hole.

[0088] In a battery cell of this structure, the pole is installed on the first wall of the shell through a through hole, and the electrode assembly can be installed on the pole through a through hole through which the conductive part passes through the pole. With this structure, on the one hand, the through hole can accommodate the conductive part and reduce the volume occupied by the conductive part on the inner side of the shell, thereby increasing the available space of the electrode assembly in the shell, which is beneficial to increase the size of the electrode assembly and improve the energy density of the battery cell. On the other hand, since the conductive part passes through the through hole, the installation between the conductive part and the pole is more reliable, which can reduce the probability of the conductive part and the pole falling off, which is beneficial to improve the reliability of the battery cell. Secondly, the first connecting part formed between the conductive part and the through hole can seal the through hole, and there is no need to set up other components to seal the through hole, thereby reducing the number of components of the battery cell and reducing the weight, thereby further improving the energy density of the battery cell.

[0089] The battery cells or batteries disclosed in the embodiments of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. A power supply system having the battery cells, batteries and electrical devices disclosed in the present application can be used, which is conducive to improving the application range of the battery cells.

[0090] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0091] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0092] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0093] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0094] Please refer to Figure 2 , Figure 2The structural exploded diagram of the battery 100 provided for some embodiments of the present application. The battery 100 includes a box body 10 and a plurality of battery cells 20, and the battery cells 20 are used to be accommodated in the box body 10. Among them, the box body 10 is used to provide an assembly space for the battery cells 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0095] In the battery 100, multiple battery cells 20 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that multiple battery cells 20 are connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 can also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection, and then multiple battery modules are connected in series, in parallel, or in a hybrid connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between multiple battery cells 20.

[0096] Please refer to Figure 2 , the battery 100 may include multiple rows of battery cells 20, and the multiple rows of battery cells 20 are arranged along the length direction of the box 10, and each row of battery cells 20 includes multiple battery cells 20 arranged along the width direction of the box 10. Alternatively, multiple rows of battery cells 20 are arranged along the width direction of the box 10, and each row of battery cells 20 includes multiple battery cells 20 arranged along the length direction of the box 10. Among them, each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but it is not limited thereto. The battery cell 20 can be cylindrical, flat, rectangular or other shapes. Exemplarily, the shape of the battery cell 20 is cylindrical.

[0097] According to some embodiments of the present application, referring to Figure 3The embodiment of the present application provides a battery cell 20, including: a shell assembly 21 and an electrode assembly 22, the shell assembly 21 includes an outer shell 211 and an electrode 212, the outer shell 211 has a first wall 2111, the first wall 2111 is provided with a through hole 2112, the electrode 212 is penetrated by the through hole 2112, the electrode 212 is provided with a through hole 2121, the through hole 2121 penetrates the electrode 212 to connect the inner and outer sides of the outer shell 211; the electrode assembly 22 is arranged in the outer shell 211, the electrode assembly 22 has a conductive part 221, the conductive part 221 is penetrated by the through hole 2121, and a first connecting part 23 is formed between the conductive part 221 and the through hole 2121, and the first connecting part 23 seals the through hole 2121.

[0098] The housing 211 may refer to a container for accommodating the electrode assembly 22. The housing 211 may be, but not limited to, an aluminum housing, a steel housing, or the like. The housing 211 may have a plurality of housing walls. For example, the housing 211 may be, but not limited to, a cylindrical housing or a square housing. Taking a square housing as an example, the housing 211 may have six housing walls, and the first wall 2111 may refer to one of the plurality of housing walls. For example, the first wall 2111 may be one of the top wall, the side wall, and the bottom wall of the housing 211.

[0099] The pole 212 may be a conductive component having one end connected to the electrode assembly 22 and the other end connected to an external conductor or to one pole of an adjacent battery cell 20 in the battery pack. The external conductor may be, but is not limited to, a busbar and a pole 212 of an adjacent battery cell 20.

[0100] The conductive part 221 may refer to a conductive component extending from the positive electrode sheet or the negative electrode sheet, and the conductive part 221 may be a tab of the positive electrode sheet or the negative electrode sheet. The conductive part 221 may be in the shape of, but not limited to, a sheet, a line, or a block, etc. Before being inserted into the via hole 2121, the conductive part 221 may be shaped by ultrasonic welding.

[0101] The first connection part 23 may refer to a structure that can be used to seal between the via hole 2121 and the conductive part 221. For example, the first connection part 23 may be a welding fusion part formed when the pole 212 and the conductive part 221 are welded. The welding fusion part may refer to a structure formed by melting and cooling the pole 212, the conductive part 221, and the solder. For example, the conductive part 221 and the via hole 2121 may be connected by laser wire welding, and the conductive part 221 and the via hole 2121 may be sealed. Alternatively, the first connection part 23 may also refer to adhesive, etc.

[0102] By sealing between the via hole 2121 and the conductive part 221 through the first connecting part 23, it is possible to reduce the entry of impurities and other pollutants from the external environment into the housing 211, thereby improving the stability of the battery cell 20 and the reliability of the battery cell 20. Secondly, in the manner of the conductive part 221 being inserted through the via hole 2121 and installed on the pole 212, considering the sealing requirements, if a cover plate is provided to seal the via hole 2121, the number of parts is large and the weight of the battery cell 20 increases. In the present application, by sealing between the via hole 2121 and the conductive part 221 through the first connecting part 23, sealing parts such as the cover plate can be omitted, the number of parts can be reduced, the weight of the battery cell 20 can be reduced, and the energy density of the battery cell 20 can be improved.

[0103] In the above technical solution, the pole 212 is installed on the first wall 2111 of the shell 211 through the through hole 2112, and the electrode assembly 22 is installed on the pole 212 through the through hole 2121 through which the conductive part 221 passes through the pole 212. On the one hand, the through hole 2121 can accommodate the conductive part 221, reduce the volume occupied by the conductive part 221 inside the shell 211, and increase the available space of the electrode assembly 22 inside the shell 211, which is conducive to increasing the size of the electrode assembly 22 and improving the energy density of the battery cell 20. On the other hand, the first connecting part 23 formed between the conductive part 221 and the through hole 221 can seal the through hole 2121, and there is no need to set up other components to seal the through hole 2121, thereby reducing the number of parts of the battery cell 20, simplifying the manufacturing process of the battery cell 20, reducing weight, reducing costs, and further improving the energy density of the battery cell 20. Since the conductive part 221 is passed through the through hole 2121 , the conductive part 221 and the pole 212 are reliably installed, which can reduce the probability of the conductive part 221 and the pole 212 falling off, thereby improving the reliability of the battery cell 20 .

[0104] A sealing member 26 may be disposed between the pole 212 and the through hole 2112, and the sealing member 26 may play a sealing role between the pole 212 and the through hole 2112. Exemplarily, the sealing member 26 may be a sealing ring.

[0105] In some embodiments of the present application, Figure 4 As shown, the housing 211 has a first direction X and a second direction Y, the first direction X and the second direction Y intersect and are parallel to the first wall 2111 , and the size of the via hole 2121 in the first direction X is greater than the size of the via hole 2121 in the second direction Y.

[0106] The first direction X and the second direction Y may refer to two directions parallel to the first wall 2111. For example, the first direction X and the second direction Y may be two of the length direction, the width direction, and the height direction of the housing 211 (see Figure 3); or, the first direction X may refer to a direction forming an angle with one of the length direction, width direction and height direction of the housing 211, and the second direction Y may refer to a direction forming an angle with another of the length direction, width direction and height direction of the housing 211. The first direction X and the second direction Y may be perpendicular to each other or be arranged at a certain angle.

[0107] The size of the via hole 2121 in the first direction X is greater than the size of the via hole 2121 in the second direction Y. It can be understood that the via hole 2121 has a length and a width, that is, the via hole 2121 can be a strip hole or a narrow narrow slit. Correspondingly, the size of the conductive part 221 in the first direction X is greater than the size of the conductive part 221 in the second direction Y, that is, the cross section of the conductive part 221 can be a strip or a narrow and long shape, and the conductive part 221 can be a sheet. In this way, the surface area of ​​the conductive part 221 can be relatively large, which is conducive to reducing the internal resistance of the conductive part 221 and improving the current density of the conductive part 221.

[0108] In the above technical solution, by setting the via 2121 to have a size in the first direction X that is larger than the size of the via 2121 in the second direction Y, the via 2121 can be a strip-shaped hole or a narrow slit, and the cross-section of the conductive portion 221 can also be a strip-shaped or narrow shape. On the one hand, it can increase the connection surface between the conductive portion 221 and the via 2121, and improve the connection reliability between the conductive portion 221 and the pole 212. On the other hand, it is beneficial to increase the surface area of ​​the conductive portion 221, reduce the internal resistance of the conductive portion 221, and thereby improve the current density of the conductive portion 221.

[0109] In some embodiments of the present application, Figure 4 As shown in FIG. 5( a ), in the first direction X, the size of the conductive portion 221 is smaller than or equal to the size of the via hole 2121 .

[0110] In the above technical solution, in the first direction X, the size of the conductive part 221 can be smaller than the size of the via hole 2121, so that a gap can be formed between the conductive part 221 and the via hole 2121, and the gap is conducive to the installation of the conductive part 221 into the via hole 2121, thereby improving the installation success rate of the conductive part 221. In the first direction X, the size of the conductive part 221 can also be equal to the size of the via hole 2121, so that there can be no gap between the conductive part 221 and the via hole 2121, so that the conductive part 221 and the via hole 2121 can be closely matched, and it is conducive to improving the sealing between the conductive part 221 and the via hole 2121.

[0111] In some embodiments of the present application, Figure 4 As shown in (a), in the first direction X, the size of the conductive portion 221 is L1, and the size of the via hole 2121 is L2, wherein 0mm≤L2-L1≤4mm.

[0112] L2-L1 can be but is not limited to 0mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4.0mm, etc.

[0113] It can be understood that in the first direction X, L2-L1 can be 0 mm, and the conductive part 221 and the hole wall of the via 2121 are in close contact, which can reduce the probability of a gap between the conductive part 221 and the via 2121, improve the sealing of the conductive part 221 and the via 2121 in the first direction X, and reduce the entry of external dust, particulate matter and other pollutants into the outer shell 211, thereby improving the reliability of the battery cell 20.

[0114] In the first direction X, if L2-L1 is greater than 4 mm, the gap between the conductive part 221 and the via hole 2121 is larger, and although the conductive part 221 can be installed in the via hole 2121 more easily, the larger gap is not conducive to improving the sealing performance of the conductive part 221 and the via hole 2121 in the first direction X. By setting L2-L1 to be less than or equal to 4 mm, the gap between the conductive part 221 and the via hole 2121 is more appropriate, and the sealing difficulty between the conductive part 221 and the via hole 2121 is reduced while facilitating the installation of the conductive part 221 in the via hole 2121, thereby improving the sealing performance between the conductive part 221 and the via hole 2121. Since the gap between the conductive part 221 and the via 2121 in the first direction X is relatively suitable, the conductive part 221 can be easily removed from the via 2121, which is convenient for maintenance and repair. It can also reduce the force between the conductive part 221 and the via 2121 during installation or disassembly, reduce the probability of damage to the conductive part 221, and improve the reliability of the battery cell 20.

[0115] Secondly, by setting L2 - L1 to be less than or equal to 4 mm, a certain adjustment gap can be provided. When installing the conductive part 221 , the displacement of the conductive part 221 in the first direction X can be adjusted, which is beneficial to improving the success rate of installing the conductive part 221 into the via 2121 .

[0116] In the above technical solution, by setting the difference between the size L1 of the conductive part 221 and the size L2 of the via 2121 in the first direction X in the range of 0 mm to 4 mm, there can be no gap or a relatively small gap between the conductive part 221 and the hole wall of the via 2121 in the first direction X. On the one hand, in the case of no gap, the sealing between the conductive part 221 and the via 2121 can be improved. On the other hand, in the case of a small gap, the installation difficulty between the conductive part 221 and the via 2121 can be reduced, and the probability of damage to the conductive part 221 during installation or disassembly is reduced, which is beneficial to reducing the probability of sealing failure between the conductive part 221 and the via 2121.

[0117] In some embodiments of the present application, Figure 4 As shown in FIG. 5( b ), in the first direction X, the size of the first connection portion 23 is larger than the size of the via hole 2121 .

[0118] The first connection part 23 may be, but is not limited to, a welding fusion part, an adhesive, etc. Exemplarily, the first connection part 23 is a welding fusion part, and the first connection part 23 is formed after the via 2121 is welded with the conductive part 221. At this time, the size of the via 2121 in the first direction X may refer to the size of the part away from the first connection part 23 and not deformed.

[0119] In the above technical solution, the first connection portion 23 can cover the via hole 2121 in the first direction X, so as to achieve a better sealing effect and reduce the probability of poor sealing between the via hole 2121 and the conductive portion 221 .

[0120] In some embodiments of the present application, Figure 4 As shown in FIG. 5( a ), in the second direction Y, the size of the conductive portion 221 is smaller than or equal to the size of the via hole 2121 .

[0121] In the above technical solution, in the second direction Y, the size of the conductive part 221 can be smaller than the size of the via hole 2121, so that there can be a gap between the conductive part 221 and the via hole 2121, which facilitates the installation of the conductive part 221 into the via hole 2121 and improves the installation success rate of the conductive part 221. In the second direction Y, the size of the conductive part 221 can also be equal to the size of the via hole 2121, so that there can be no gap between the conductive part 221 and the via hole 2121, so that the conductive part 221 and the via hole 2121 can be closely matched, which is conducive to improving the sealing between the conductive part 221 and the via hole 2121.

[0122] In some embodiments of the present application, Figure 4 As shown in (a), in the second direction Y, the size of the conductive portion 221 is W1, and the size of the via hole 2121 is W2, wherein 0 mm ≤ W2 - W1 ≤ 0.1 mm.

[0123] W2-W1 may be, but not limited to, 0 mm, 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, etc. The size W2 of the via 2121 may refer to the width size. In the electrode assembly 22, the positive electrode sheet and the negative electrode sheet may be multi-layered, and the conductive portion 221 may be a plurality of layers of positive electrode sheets or a plurality of layers of negative electrode sheets extending out of a portion and stacking them. Therefore, the size W2 of the via 2121 satisfies the formula: W2=S*δ (S is the number of layers of the positive electrode sheet or the negative electrode sheet, and δ is the thickness of the extended portion of a single positive electrode sheet or a negative electrode sheet).

[0124] It can be understood that in the second direction Y, W2-W1 can be 0 mm, that is, the conductive part 221 and the hole wall of the via 2121 are in close contact, which can reduce the probability of a gap between the conductive part 221 and the via 2121, improve the sealing of the conductive part 221 and the via 2121 in the second direction Y, and reduce the entry of external dust, particulate matter and other pollutants into the outer shell 211, thereby improving the reliability of the battery cell 20.

[0125] Since the size of the via 2121 in the first direction X is greater than the size of the via 2121 in the second direction Y, that is, the first direction X is the length direction of the via 2121, and the second direction Y is the width direction of the via 2121. In the second direction Y, if W2-W1 is greater than 0.1 mm, according to the volume calculation formula of the rectangular space, the gap space between the conductive part 221 and the via 2121 will increase significantly, which is not conducive to improving the sealing of the conductive part 221 and the via 2121 in the second direction Y. By setting W2-W1 to be less than or equal to 0.1 mm, the gap between the conductive part 221 and the via 2121 is more appropriate, which can reduce the difficulty of sealing between the conductive part 221 and the via 2121 while facilitating the installation of the conductive part 221 into the via 2121, which is conducive to improving the sealing between the conductive part 221 and the via 2121.

[0126] Moreover, since the gap between the conductive part 221 and the via 2121 in the second direction Y is relatively suitable, the conductive part 221 can be easily removed from the via 2121, which is convenient for maintenance and repair. It can also reduce the force between the conductive part 221 and the via 2121 during installation or disassembly, reduce the probability of damage to the conductive part 221, and improve the reliability of the battery cell 20.

[0127] In the above technical solution, by setting the difference between the size W1 of the conductive part 221 and the size W2 of the via 2121 in the second direction Y within the range of 0 mm to 0.1 mm, there can be no gap or a relatively small gap between the conductive part 221 and the hole wall of the via 2121 in the second direction Y. On the one hand, in the case of no gap, the sealing between the conductive part 221 and the via 2121 can be improved. On the other hand, in the case of a small gap, the installation difficulty between the conductive part 221 and the via 2121 can be reduced, and the probability of damage to the conductive part 221 during installation or disassembly can be reduced, which is beneficial to reducing the probability of sealing failure between the conductive part 221 and the via 2121.

[0128] In some embodiments of the present application, Figure 4 As shown in FIG. 5( b ), in the second direction Y, the size of the first connection portion 23 is larger than the size of the via hole 2121 .

[0129] The first connection part 23 may be, but is not limited to, a welding fusion part, an adhesive, etc. Exemplarily, the first connection part 23 is a welding fusion part, and the first connection part 23 is formed after a portion of the via 2121 is welded with the conductive part 221. At this time, the size of the via 2121 in the second direction Y may refer to the size of the part away from the first connection part 23 and not deformed.

[0130] In the above technical solution, the first connecting portion 23 can cover the via hole 2121 in the second direction Y, so as to achieve a better sealing effect and reduce the probability of poor sealing between the via hole 2121 and the conductive portion 221 .

[0131] In some embodiments of the present application, Figure 3 As shown, the conductive portion 221 has a distal end portion 2211 away from the inner side of the housing 211 , and the distal end portion 2211 is connected to the via 2121 through the first connecting portion 23 .

[0132] The via hole 2121 may be a hole that penetrates the pole 212 and has a large depth. The via hole 2121 located inside the housing 211 is the inner side, and the via hole 2121 close to the outside of the housing 211 is the outer side. The distal end 2211 may refer to the end close to the outer side of the via hole 2121. The distal end 2211 may be located inside the via hole 2121, or the distal end 2211 may be flush with the outer edge of the via hole 2121, or the distal end 2211 may extend out of the via hole 2121.

[0133] The outer side of the via 2121 can be called the entrance side. The conductive part 221 is connected to the via 2121 through the first connecting part 23 at the distal end 2211, so that the entrance side of the via 2121 can be sealed, thereby reducing the entry of impurities, large particles and other pollutants into the gap formed between the conductive part 221 and the via 2121, reducing the residual amount of pollutants in the via 2121, and reducing the probability of damage to the pole 212 and the conductive part 221 due to chemical reactions caused by the presence of pollutants in the via 2121.

[0134] Secondly, the first connection part 23 can be arranged outside the conductive part 221 and the via hole 2121, which reduces the difficulty of forming the first connection part 23, improves the forming rate of the first connection part 23, and is conducive to reducing costs. Taking the welding method between the conductive part 221 and the via hole 2121 as an example, the welding gun can weld the distal end 2211 outside the via hole 2121, the welding gun is easier to arrange, and the probability of forming the welding fusion part is also higher.

[0135] In the above technical solution, the conductive part 221 is connected to the via hole 2121 through the first connecting part 23 at the distal end 2211. On the one hand, the first connecting part 23 is located outside the via hole 2121, which is convenient to form, and can reduce the difficulty of connecting the conductive part 221 and the via hole 2121, thereby improving the product yield. On the other hand, the first connecting part 23 is connected between the distal end 2211 and the via hole 2121, which can effectively prevent impurities, large particles and other pollutants from penetrating into the via hole 2121, reduce the number of pollutants in the gap formed between the conductive part 221 and the via hole 2121, and reduce the probability of electrochemical corrosion of the conductive part 221 and the pole 212, which is conducive to improving the reliability of the battery cell 20.

[0136] In some embodiments of the present application, Figures 3 to 5 As shown, the pole 212 has a first surface 2122 , the first surface 2122 is provided with an avoidance groove 2123 , the through hole 2121 passes through the avoidance groove 2123 , and the first connecting portion 23 is located in the avoidance groove 2123 .

[0137] The first surface 2122 may be, but is not limited to, the top surface and the side surface of the pole 212. For example, the housing 211 may have a third direction Z, and the third direction Z may be perpendicular to the first direction X and the second direction Y. For example, the third direction Z may refer to the height direction of the housing 211. That is, the first surface 2122 may be the top surface of the pole 212 located in the third direction Z, or may be the side surface of the pole 212 located in the first direction X or the side surface of the pole 212 located in the second direction Y.

[0138] Exemplarily, the first connection portion 23 may be a welding fusion portion. When the pole 212 and the conductive portion 221 are welded, a welding excess height may be formed. At this time, the avoidance groove 2123 may play a role in accommodating the welding excess height.

[0139] In the above technical solution, the avoidance groove 2123 can accommodate the first connection portion 23, which can reduce the volume of the assembly formed by the pole 212, the conductive portion 221 and the first connection portion 23, which is conducive to saving space. On the other hand, by providing the avoidance groove 2123, the weight of the pole 212 can be reduced, and the energy density of the battery cell 20 can be improved.

[0140] In some embodiments of the present application, Figure 3 As shown, the first connection portion 23 has an outer contour surface 23 a facing the outer side of the avoidance groove 2123 , and the outer contour surface 23 a does not protrude from the first surface 2122 .

[0141] The outer contour surface 23a may be, but is not limited to, an arc, a rectangle, and a cone. In the above technical solution, by setting the outer contour surface 23a of the first connecting portion 23 not to protrude from the first surface 2122, the probability that the first surface 2122 is a plane can be increased. When the pole 212 is connected to the adapter 24 through the first surface 2122, the pole 212 and the adapter 24 can stop each other face to face, which is beneficial to improving the connection reliability between the pole 212 and the adapter 24, and improving the reliability of the battery cell 20.

[0142] In some embodiments of the present application, Figure 5 As shown, the housing 211 has a third direction Z, and the third direction Z is perpendicular to the first wall 2111 . In the third direction Z, the size of the avoidance groove 2123 is H1 , wherein 1 mm ≤ H1 .

[0143] In the above technical solution, the third direction Z may be the groove depth direction of the avoidance groove 2123, the conductive part 221 and the pole 212 may be connected by welding, and the height of the welded fusion part is generally less than 1 mm. By setting the dimension H1 of the avoidance groove 2123 in the third direction Z to be greater than or equal to 1 mm, the avoidance groove 2123 can accommodate a larger volume of the first connection part 23, and can increase the probability of completely accommodating the first connection part 23. Secondly, the dimension H1 of the avoidance groove 2123 is greater than or equal to 1 mm, which can also further reduce the weight of the pole 212 and improve the energy density of the battery cell 20.

[0144] In some embodiments of the present application, Figure 4 (b) and Figure 5 As shown, in the second direction Y, the size of the avoidance groove 2123 is W3, where W3≥2 mm.

[0145] In the above technical solution, if W3 is less than 2 mm, the size of the avoidance groove 2123 in the second direction Y is relatively small. In order to accommodate the first connection part 23 in the avoidance groove 2123, the size of the first connection part 23 in the second direction Y is correspondingly relatively small, which is not conducive to the first connection part 23 sealing the conductive part 221 and the via hole 2121, and is not conducive to improving the connection reliability between the conductive part 221 and the pole 212. By setting W3 to be greater than 2 mm, the size of the avoidance groove 2123 in the second direction Y is more appropriate, and the size of the first connection part 23 in the avoidance groove 2123 can be relatively large, which is conducive to the first connection part 23 sealing the conductive part 221 and the via hole 2121, and improving the connection reliability between the conductive part 221 and the pole 212.

[0146] In some embodiments of the present application, Figure 4 As shown in (a), in the first direction X, the size of the avoidance groove 2123 is L3, and the size of the conductive portion 221 is L1, wherein L3-L1≥2mm.

[0147] That is to say, L3-L1 can be but is not limited to 2mm, 2.2mm, 2.4mm, 2.8mm, 3mm, 3.2mm, 3.8mm, 4mm, etc.

[0148] In the above technical solution, in the first direction X, if the size L3 of the avoidance groove 2123 is 2 mm smaller than the size L1 of the conductive part 221, then in the first direction X, the space left by the avoidance groove 2123 for the first connecting part 23 is limited, and the size of the first connecting part 23 in the first direction X is also very small even if it is in contact with the groove wall of the avoidance groove 2123, which is not conducive to the sealing of the conductive part 221 and the via hole 2121, and the connection between the conductive part 221 and the pole 212. That is to say, by making the size L3 of the avoidance groove 2123 greater than or equal to 2 mm than the size L1 of the conductive part 221, a relatively large space can be formed between the avoidance groove 2123 and the conductive part 221 in the first direction X for forming the first connecting part 23, which is conducive to the sealing of the conductive part 221 and the via hole 2121, and improving the connection reliability between the conductive part 221 and the pole 212.

[0149] In some embodiments of the present application, Figure 6 and Figure 8 As shown, the pole 212 has a first surface 2122, the through hole 2121 passes through the first surface 2122, the first connecting portion 23 protrudes from the first surface 2122, the pole 212 is used to connect the adapter 24, and the end of the adapter 24 facing the first surface 2122 is provided with a receiving portion 24a, and the first connecting portion 23 is at least partially located in the receiving portion 24a.

[0150] The first surface 2122 may refer to the above description. The first surface 2122 may refer to a surface for connecting the adapter 24. The adapter 24 may be a conductive component for connecting other battery cells 20 or a power connection device. For example, the adapter 24 may be, but is not limited to, a bus bar.

[0151] In the above technical solution, the first connection part 23 can protrude from the first surface 2122. In this case, the first connection part 23 can be unobstructed around it, so it is easier to form the first connection part 23, which can improve the molding probability of the first connection part 23. The accommodating portion 24a of the adapter 24 can accommodate the first connection part 23, so that the assembly formed by the pole 212, the conductive portion 221 and the adapter 24 is relatively small, and can reduce weight, thereby improving the energy density of the battery cell 20.

[0152] Furthermore, if Figure 8 As shown, the end of the adapter 24 facing the first surface 2122 is provided with a receiving portion 24 a , the first surface 2122 is provided with an avoidance groove 2123 , part of the first connecting portion 23 is located in the receiving portion 24 a , and the rest is located in the avoidance groove 2123 .

[0153] In the above technical solution, the accommodating portion 24a and the avoidance groove 2123 can simultaneously accommodate the first connecting portion 23. Under the condition of accommodating the first connecting portion 23, the space of the accommodating portion 24a and the avoidance groove 2123 can be made relatively small, so that the structural strength of the adapter 24 and the pole 212 itself is relatively high and not easy to be damaged.

[0154] In some embodiments of the present application, Figure 7 As shown, the pole 212 has a first surface 2122 , the through hole 2121 passes through the first surface 2122 , and the first connecting portion 23 has an outer contour surface 23 a facing the outside of the pole 212 , and the outer contour surface 23 a is flush with the first surface 2122 .

[0155] Referring to the above, the first connection portion 23 may be, but is not limited to, a welding fusion portion, adhesive, etc. After being formed, the first connection portion 23 will protrude from the first surface 2122. At this time, the first connection portion 23 may be processed so that the outer contour surface 23a is flush with the first surface 2122. For example, when the first connection portion 23 is a welding fusion portion, the welding fusion portion will form a welding excess height. At this time, the welding excess height may be polished and removed to keep the first surface 2122 flat.

[0156] In the above technical solution, by setting the outer contour surface 23a of the first connecting portion 23 and the first surface 2122 of the pole 212 to be flush, when the pole 212 is connected to the adapter 24 through the first surface 2122, the connection between the pole 212 and the adapter 24 can be made tighter, which is beneficial to improving the connection reliability between the pole 212 and the adapter 24.

[0157] In some embodiments of the present application, Fig.10 As shown, the through hole 2121 has a first opening 2121a formed on the outside of the pole 212 and a second opening 2121b formed on the inside of the pole 212 , and the projection of the first opening 2121a on the first wall 2111 does not overlap with the projection of the second opening 2121b on the first wall 2111 .

[0158] The first opening 2121a and the second opening 2121b may refer to the openings at both ends of the through hole 2121. The projection of the first opening 2121a on the first wall 2111 and the projection of the second opening 2121b on the first wall 2111 do not overlap. It can be understood that the first opening 2121a and the second opening 2121b of the through hole 2121 are staggered. The molding process of the first connecting portion 23 is not likely to affect the electrode assembly 22 on the inner side of the outer shell 211 through the second opening 2121b.

[0159] For example, when the first connection portion 23 is a welding fusion portion, during the welding process of the first connection portion 23, the laser emitted by the laser welding gun is not easy to pass through the second hole 2121b to reach the electrode assembly 22, thereby reducing the probability of the electrode assembly 22 being damaged by laser ablation. For example again, when the first connection portion 23 is a glue, the glue will not drip onto the electrode assembly 22 inside the shell 211 through the second hole 2121b when the first connection portion 23 is formed, thereby reducing the impact of the glue on the internal environment of the shell 211.

[0160] In the above technical solution, by making the projections of the first opening 2121a and the second opening 2121b of the through hole 2121 on the first wall 2111 non-overlapping, the impact of the first connecting portion 23 on the internal environment of the shell 211 and the electrode assembly 22 during the molding process can be effectively reduced, thereby improving the safety of the internal environment of the shell 211 and the electrode assembly 22.

[0161] In some embodiments of the present application, Fig.10 As shown, the through hole 2121 has a hole center axis 2121c, and the hole center axis 2121c is inclined relative to the first wall 2111.

[0162] In the above technical solution, the center axis 2121c of the through hole 2121 is inclined relative to the first wall 2111, that is, the through hole 2121 is an inclined hole arranged relative to the first wall 2111. This can reduce the impact of the first connecting part 23 on the internal environment of the shell 211 and the electrode assembly 22 during the molding process, and at the same time increase the manufacturability of the through hole 2121, which is beneficial to improving the product yield of the pole 212 during the manufacturing process.

[0163] In some embodiments of the present application, Fig.10 As shown, the angle between the hole center axis 2121c and the first wall 2111 is α, where 45 degrees ≤ α ≤ 90 degrees.

[0164] It can be understood that the angle α between the hole axis 2121c and the first wall 2111 can be but is not limited to 45 degrees, 48 ​​degrees, 50 degrees, 53 degrees, 55 degrees, 58 degrees, 60 degrees, 63 degrees, 65 degrees, 68 degrees, 70 degrees, 73 degrees, 75 degrees, 78 degrees, 80 degrees, 83 degrees, 85 degrees, 88 degrees, 90 degrees, etc.

[0165] In the above technical solution, if the angle α between the hole axis 2121c and the first wall 2111 is less than 45 degrees, the width of the pole 212 will be relatively large, increasing the material consumption and also increasing the manufacturing difficulty of the pole 212; if the angle α between the hole axis 2121c and the first wall 2111 is greater than 90 degrees, the offset distance between the first orifice 2121a and the second orifice 2121b is relatively small, which is not conducive to reducing the impact of the first connecting portion 23 on the internal environment of the shell 211 and the electrode assembly 22 during the molding process.

[0166] In some embodiments of the present application, Fig.10 As shown, a guide opening 2124 is formed between the inner side of the pole 212 and the through hole 2121 , and the width of the guide opening 2124 gradually decreases in a direction from the inner side of the pole 212 to the outer side of the pole 212 .

[0167] The inner side of the pole 212 may refer to a side close to the inner side of the housing 211, that is, a guide opening 2124 is formed between the end of the via hole 2121 close to the inner side of the housing 211 and the pole 212, and the guide opening 2124 may be in a bell-shaped shape. Exemplarily, a chamfer may be formed between the pole 212 and the via hole 2121 to form the guide opening 2124, or a rounded corner may be formed between the pole 212 and the via hole 2121 to form the guide opening 2124.

[0168] In the above technical solution, since the width of the guide opening 2124 gradually decreases in the direction from the inside of the pole 212 to the outside of the pole 212, and the starting width of the guide opening 2124 is greater than the width of the through hole 2121, during the process of installing the conductive part 221 into the through hole 2121, the conductive part 221 can relatively easily enter the guide opening 2124 first, and can be easily inserted into the through hole 2121 under the guiding action of the guide opening 2124. In this way, the resistance of the conductive part 221 when passing through the through hole 2121 can be reduced, the damage to the conductive part 221 can be reduced, and the installation efficiency of the conductive part 221 can be improved.

[0169] In some embodiments of the present application, as shown in the figure, the pole 212 includes a column portion 2021, a first plate portion 2022 and a second plate portion 2023, and the column portion 2021 is penetrated by the through hole 2112; the first plate portion 2022 and the second plate portion 2023 are vertically connected to the column portion 2021, the first plate portion 2022 is located on the outside of the shell 211, and the second plate portion 2023 is located on the inside of the shell 211; wherein the through hole 2121 passes through the first plate portion 2022, the column portion 2021 and the second plate portion 2023.

[0170] The column part 2021 may be a columnar component, and the column part 2021 may be, but not limited to, a cylindrical or rectangular column. The first plate part 2022 and the second plate part 2023 may be plate-shaped components, and the shapes of the first plate part 2022 and the second plate part 2023 may be, but not limited to, a flat plate.

[0171] In the above technical solution, by configuring the pole 212 to include a column portion 2021, a first plate portion 2022, and a second plate portion 2023, the pole 212 can be in an I-shaped structure. The first plate portion 2022 and the second plate portion 2023 are located on both sides of the shell 211, which can reduce the probability of the pole 212 being separated from the shell 211 and improve the installation reliability of the pole 212 and the shell 211. The via 2121 can be formed on the first plate portion 2022, the column portion 2021, and the second plate portion 2023. The accommodation space formed in the via 2121 is large, which can accommodate a larger volume of the conductive portion 221, improve the connection reliability between the conductive portion 221 and the pole 212, and the effect of reducing the mass of the pole 212 is better, which is conducive to improving the energy density of the battery cell 20.

[0172] In some embodiments of the present application, Figure 8 As shown, a connection area 2125 is provided on the pole 212 . The connection area 2125 is used to connect to the adapter 24 , and a second connection portion 25 is formed between the connection area 2125 and the adapter 24 .

[0173] Referring to the foregoing, since the conductive portion 221 can pass through 2121, and the conductive portion 221 and the through 2121 can be sealed and connected through the first connecting portion 23, there is no need to set a cover plate or other components on the pole 212, and the pole 212 can be directly connected to the adapter 24 by setting a connection area 2125, that is, the connection area 2125 can refer to a connection position on the pole 212 for connecting the adapter 24. Among them, the connection area 2125 can be set to multiple on the pole 212, and the connection reliability between the pole 212 and the adapter 24 can be improved by increasing the number of connection areas 2125. Exemplarily, the connection area 2125 is set to two on the pole 212.

[0174] The second connection portion 25 may refer to a welding fusion portion, and the welding fusion portion may specifically refer to a structure formed by welding and melting the pole 212 and the adapter 24 .

[0175] In the above technical solution, the pole 212 is connected to the adapter 24 via the connecting area 2125, and a second connecting portion 25 is formed between the connecting area 2125 and the adapter 24. In this way, the pole 212 and the adapter 24 can be connected without setting additional components between the two, which can reduce the number of components and further reduce the weight of the battery cell 20, which is beneficial to improving the energy density of the battery cell 20.

[0176] In some embodiments of the present application, Figure 3 and Figure 8 As shown, the housing 211 includes a housing body 2011 and an end cover 2012 . The end cover 2012 is disposed to cover the opening of the housing body 2011 . The housing body 2011 or the end cover 2012 is formed with a first wall 2111 .

[0177] The shell body 2011 may be, but not limited to, cylindrical, square, etc. The shell body 2011 may have a plurality of shell walls, and the first wall 2111 may be a shell wall of the shell body 2011 located in any direction of the first direction X, the second direction Y, and the third direction Z. The end cover 2012 may refer to a cover plate for closing the opening of the shell body 2011, and the first wall 2111 may also be formed on the end cover 2012, wherein the end cover 2012 may be provided at one end of the shell body 2011 located in any direction of the first direction X, the second direction Y, and the third direction Z.

[0178] In the above technical solution, the first wall 2111 can be arranged on the shell body 2011, that is, the through hole 2121 is arranged on the shell body 2011, and the pole 212 is installed on the shell body 2011. This method can simplify the structure on the end cover 2012, reduce the number of parts on the end cover 2012, and reduce the weight of the end cover 2012, so as to improve the connection reliability between the end cover 2012 and the shell body 2011. The first wall 2111 can also be arranged on the end cover 2012, that is, the through hole 2121 is arranged on the end cover 2012, and the pole 212 is installed on the end cover 2012. Since the end cover 2012 can be separated from the shell body 2011 and processed separately, the through hole 2121 can be processed while processing the end cover 2012, which can reduce the manufacturing difficulty of the through hole 2121 and improve the processing yield of the through hole 2121.

[0179] In a second aspect, the embodiment of the present application further provides a battery 100 , comprising the battery cell 20 described above.

[0180] The battery 100 may be a battery module, and the battery module may include a plurality of battery cells 20. The battery 100 may also be referred to as a battery pack, and may include a plurality of battery modules.

[0181] In the above technical solution, the battery cell 20 is provided with a through hole 2121 on the pole 212, the conductive part 221 of the electrode assembly 22 is passed through the through hole 2121, and the through hole 2121 and the conductive part 221 are sealed and connected through the first connecting part 23. This method is beneficial to reducing the number of components of the battery cell 20 and reducing the weight of the battery cell 20, which can improve the energy density of the battery cell 20, and further improve the energy density of the battery 100.

[0182] In a third aspect, an embodiment of the present application further provides an electrical device, including the battery cell 20 described above, or the battery 100 described above.

[0183] In the above technical solution, the use of the above-mentioned battery cell 20 or battery 100 can effectively improve the battery energy density, thereby increasing the working time of the electrical device, and significantly improving the user experience.

[0184] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0185] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A housing assembly, the housing assembly comprising a housing and a pole, the housing having a first wall, the first wall being provided with a through hole, the pole being passed through the through hole, the pole being provided with a through hole, the through hole penetrating the pole to connect the inner and outer sides of the housing; An electrode assembly is provided in the housing, and the electrode assembly has a conductive portion, the conductive portion is passed through the via hole, and a first connecting portion is formed between the conductive portion and the via hole, and the first connecting portion seals the via hole.

2. The battery cell according to claim 1, characterized in that: The housing has a first direction and a second direction, the first direction intersects with the second direction and is parallel to the first wall, and a size of the via hole in the first direction is greater than a size of the via hole in the second direction.

3. The battery cell according to claim 2, characterized in that: In the first direction, a size of the conductive portion is smaller than or equal to a size of the via hole.

4. The battery cell according to claim 3, characterized in that: In the first direction, the size of the conductive portion is L1, and the size of the via hole is L2, wherein 0mm≤L2-L1≤4mm.

5. The battery cell according to claim 3 or 4, characterized in that: In the first direction, a size of the first connection portion is larger than a size of the via hole.

6. The battery cell according to any one of claims 2 to 5, characterized in that: In the second direction, a size of the conductive portion is smaller than or equal to a size of the via hole.

7. The battery cell according to claim 6, characterized in that: In the second direction, the size of the conductive portion is W1, and the size of the via hole is W2, wherein 0 mm ≤ W2 - W1 ≤ 0.1 mm.

8. The battery cell according to claim 6 or 7, characterized in that: In the second direction, a size of the first connecting portion is larger than a size of the via hole.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The conductive portion has a distal end portion away from the inner side of the housing, and the distal end portion is connected to the via hole through the first connecting portion.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The pole has a first surface, the first surface is provided with an escape groove, the via hole passes through the escape groove, and the first connecting portion is located in the escape groove.

11. The battery cell according to claim 10, characterized in that: The first connecting portion has an outer contour surface facing the outer side of the avoidance groove, and the outer contour surface does not protrude from the first surface.

12. The battery cell according to claim 10 or 11, characterized in that: The shell has a third direction, the third direction is perpendicular to the first wall, and in the third direction, a size of the avoidance groove is H1, wherein 1 mm≤H1.

13. The battery cell according to any one of claims 1 to 9, characterized in that: The pole has a first surface, the through hole passes through the first surface, the first connecting portion protrudes from the first surface, the pole is used to connect an adapter, an accommodating portion is provided at the end of the adapter facing the first surface, and the first connecting portion is at least partially located in the accommodating portion.

14. The battery cell according to any one of claims 1 to 9, characterized in that: The pole has a first surface, the via hole passes through the first surface, and the first connecting portion has an outer contour surface facing the outer side of the pole, and the outer contour surface is flush with the first surface.

15. The battery cell according to any one of claims 1 to 14, characterized in that: The through hole forms a first hole on the outer side of the pole and a second hole on the inner side of the pole, and a projection of the first hole on the first wall and a projection of the second hole on the first wall do not overlap.

16. The battery cell according to claim 15, characterized in that: The through hole has a hole center axis, and the hole center axis is arranged obliquely relative to the first wall.

17. The battery cell according to claim 16, characterized in that: The angle between the center axis of the hole and the first wall is α, wherein 45 degrees ≤ α ≤ 90 degrees.

18. The battery cell according to any one of claims 1 to 17, characterized in that: A guide opening is formed between the inner side of the pole and the through hole, and the width of the guide opening gradually decreases in a direction from the inner side of the pole to the outer side of the pole.

19. The battery cell according to any one of claims 1 to 18, characterized in that: The pole comprises: A column portion, wherein the column portion is passed through the through hole; A first plate portion and a second plate portion, wherein the first plate portion and the second plate portion are vertically connected to the column portion, the first plate portion is located on the outer side of the shell, and the second plate portion is located on the inner side of the shell; wherein the via hole passes through the first plate portion, the column portion and the second plate portion.

20. The battery cell according to any one of claims 1 to 19, characterized in that: The pole is provided with a connection area, which is used to connect to the adapter and forms a second connection portion with the adapter.

21. The battery cell according to any one of claims 1 to 20, characterized in that: The housing comprises a shell body and an end cover, wherein the end cover is arranged to cover the opening of the shell body, and the shell body or the end cover forms the first wall.

22. A battery, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 21.

23. An electrical device, characterized in that: Comprising the battery cell according to any one of claims 1 to 21, or the battery according to claim 22.

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