Battery cell, battery, and electrical apparatus

Abstract

A battery cell (20), a battery (100), and an electrical apparatus. The battery cell (20) comprises: a casing assembly (21), the casing assembly (21) comprising a housing (211) and a post (212), the housing (211) having a first wall (2111), the first wall (2111) being provided with a through hole (2112), the post (212) passing through the through hole (2112), the post (212) being provided with a via hole (2121), and the via hole (2121) passing through the post (212) to connect the inner and outer sides of the housing (211); and an electrode assembly (22), the electrode assembly (22) being provided in the housing (211), the electrode assembly (22) having a conductive portion (221), the conductive portion (221) passing through the via hole (2121), a first connecting portion (23) being formed between the conductive portion (221) and the via hole (2121), and the first connecting portion (23) sealing the via hole (2121).

Description

Battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number: 202311532060.3 and application date of November 16, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] 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

[0004] New energy vehicles have experienced rapid growth in recent years. Within the electric vehicle sector, power batteries, as the power source, play an irreplaceable and crucial role. A battery consists of a housing and multiple cells housed within it. Currently, increasing the energy density of each cell is a pressing challenge to enhance battery energy storage capacity.

[0005] Summary of the Invention

[0006] 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 improvement of the energy storage capacity of the battery.

[0007] In the first aspect, an embodiment of the present application provides a battery cell, comprising: a shell assembly, the shell assembly comprising an outer shell and a pole, the outer shell having a first wall, the first wall being provided with a through hole, the pole passing through the through hole, the pole being provided with a through hole, the through hole passing through the pole 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 passing through the through hole, and a first connecting part being formed between the conductive part and the through hole, the first connecting part sealing the through hole.

[0008] In the above technical solution, the electrode post is mounted on the first wall of the housing via a through-hole, and the electrode assembly is mounted on the electrode post via a through-hole formed by the conductive portion extending through the electrode post. On the one hand, the through-hole accommodates the conductive portion, reducing the volume occupied by the conductive portion inside the housing, thereby increasing the available space for the electrode assembly within the housing, facilitating an increase in the size of the electrode assembly and improving the energy density of the battery cell. On the other hand, the first connecting portion formed between the conductive portion and the through-hole seals the through-hole, eliminating the need for additional components to seal the through-hole. This reduces the number of battery cell components, simplifies the battery cell manufacturing process, reduces weight, lowers costs, and further improves the battery cell's energy density. Furthermore, because the conductive portion extends through the through-hole, the conductive portion and the electrode post are more securely mounted, reducing the chance of the conductive portion and the electrode post becoming detached, thereby improving the reliability of the battery cell.

[0009] 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 larger than a size of the via in the second direction.

[0010] 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 narrow slit, and the cross-section of the conductive part can also be a strip or a narrow slit. 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.

[0011] In some embodiments of the present application, in the first direction, the size of the conductive portion is smaller than or equal to the size of the via hole.

[0012] In the above technical solution, the conductive portion can be smaller than the via in the first direction, creating a gap between the conductive portion and the via. This gap facilitates installation of the conductive portion into the via, improving the success rate of successful installation. Alternatively, the conductive portion can be equal to the via in the first direction, eliminating a gap between the conductive portion and the via. This ensures a tight fit between the conductive portion and the via, and improves the seal between the conductive portion and the via.

[0013] 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 0 mm ≤ L2 - L1 ≤ 4 mm.

[0014] 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 0 mm to 4 mm, 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, when there is no gap, the sealing between the conductive part and the via can be improved. On the other hand, when the gap is small, the installation difficulty between the conductive part and the via can be reduced, 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.

[0015] 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.

[0016] 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.

[0017] In some embodiments of the present application, in the second direction, the size of the conductive portion is smaller than or equal to the size of the via hole.

[0018] In the above technical solution, in the second direction, the size of the conductive portion can be smaller than the size of the via hole, so that there can be a gap between the conductive portion and the via hole, which facilitates the installation of the conductive portion into the via hole and improves the success rate of the conductive portion installation. In the second direction, the size of the conductive portion can also be equal to the size of the via hole, so that there can be no gap between the conductive portion and the via hole. This allows the conductive portion and the via hole to fit tightly together, which is conducive to improving the sealing between the conductive portion and the via hole.

[0019] 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.

[0020] 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, in the case of no gap, the sealing between the conductive part and the via can be improved. On the other hand, in the case of a small gap, the installation difficulty between the conductive part and the via can be reduced, 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] In the above technical solution, the conductive portion is connected to the via at the distal end via a first connecting portion. On the one hand, the first connecting portion is located outside the via, making it easier to form, reducing the difficulty of connecting the conductive portion and the via, and improving product yield. On the other hand, the first connecting portion is connected between the distal end and the via, effectively preventing contaminants such as impurities and large particles from penetrating deeply into the via, reducing the amount of contaminants that enter the gap between the conductive portion and the via, and reducing the chance of electrochemical corrosion of the conductive portion and the terminal, thereby improving the reliability of the battery cell.

[0025] In some embodiments of the present application, the pole has a first surface, a avoidance groove is provided on the first surface, the via hole passes through the avoidance groove, and the first connecting portion is located in the avoidance groove.

[0026] In the above technical solution, the avoidance groove serves to accommodate the first connecting portion, thereby reducing the volume of the assembly formed by the terminal, the conductive portion, and the first connecting portion, thereby saving space. Furthermore, the provision of the avoidance groove reduces the weight of the terminal, thereby increasing the energy density of the battery cell.

[0027] 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.

[0028] In the above technical solution, by setting the outer contour surface of the first connecting portion 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 improving the connection reliability between the pole and the adapter and improving the reliability of the battery cell.

[0029] In some embodiments of the present application, the housing has a third direction, which is perpendicular to the first wall. In the third direction, a size of the avoidance groove is H1, where 1 mm ≤ H1.

[0030] In the above technical solution, the third direction can be the depth of the avoidance groove. The conductive portion and the terminal can be welded together, and the height of the weld fusion is generally less than 1mm. By setting the dimension H1 of the avoidance groove in the third direction to be greater than or equal to 1mm, the avoidance groove can accommodate a larger first connecting portion and increase the probability of fully accommodating the first connecting portion. Furthermore, the avoidance groove dimension H1 being greater than or equal to 1mm can further reduce the weight of the terminal and increase the energy density of the battery cell.

[0031] In some embodiments of the present application, 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 the adapter, and the end of the adapter facing the first surface is provided with an accommodating portion, and the first connecting portion is at least partially located in the accommodating portion.

[0032] In the above technical solution, the first connecting portion can protrude from the first surface. In this case, the first connecting portion can be unobstructed on all sides, making it easier to form the first connecting portion and improving the molding efficiency of the first connecting portion. The receiving portion of the adapter can accommodate the first connecting portion, making the assembly formed by the terminal, conductive portion, and adapter relatively small, reducing weight, and improving the energy density of the battery cell.

[0033] In some embodiments of the present application, 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 outside of the pole, and the outer contour surface is flush with the first surface.

[0034] In the above technical solution, by setting the outer contour surface of the first connecting portion 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 conducive to improving the connection reliability between the pole and the adapter.

[0035] In some embodiments of the present application, the via has a first opening formed on the outside of the pole and a second opening formed on the inside of the pole, and the projection of the first opening on the first wall does not overlap with the projection of the second opening on the first wall.

[0036] In the above technical solution, by making the projections of the first opening and the second opening of the through hole on the first wall non-overlapping, the impact of the first connecting part 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.

[0037] In some embodiments of the present application, the through hole has a hole center axis, and the hole center axis is inclined relative to the first wall.

[0038] In the above technical solution, the axis of the through hole is tilted relative to the first wall, that is, the through 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 through hole, which is beneficial to improving the product yield of the pole during the manufacturing process.

[0039] In some embodiments of the present application, the angle between the center axis of the hole and the first wall is α, where 45 degrees ≤ α ≤ 90 degrees.

[0040] 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.

[0041] 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.

[0042] 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 through hole, the conductive part can enter the guide opening more easily during the process of being installed in the through hole, and can be easily inserted into the through hole under the guidance of the guide opening. In this way, the resistance of the conductive part when passing through the through hole can be reduced, the damage to the conductive part can be reduced, and the installation efficiency of the conductive part can be improved.

[0043] In some embodiments of the present application, the pole includes: a column portion, the column portion is passed through the 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.

[0044] In the above technical solution, by configuring the terminal to include a body, a first plate, and a second plate, the terminal can form an I-shaped structure. The first and second plates are located on both the inside and outside of the housing, which reduces the probability of the terminal detaching from the housing and improves the reliability of the terminal-to-housing connection. Vias can be formed in the first plate, the body, and the second plate. The larger accommodation space created within the vias can accommodate a larger conductive part, improving the reliability of the connection between the conductive part and the terminal. Furthermore, the terminal mass is reduced, which helps increase the energy density of the battery cell.

[0045] 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.

[0046] 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 up additional components between the two, which can reduce the number of components and thus reduce the weight of the battery cell, which is conducive to improving the energy density of the battery cell.

[0047] 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.

[0048] In the above technical solution, the first wall can be provided on the shell, that is, the via is provided on the shell, and the pole is mounted on the shell. This approach can simplify the structure of the end cap, reduce the number of components on the end cap, and reduce the weight of the end cap, thereby improving the connection reliability between the end cap and the shell. The first wall can also be provided on the end cap, that is, the via is provided on the end cap, and the pole is mounted on the end cap. Because the end cap can be processed separately from the shell, the via can be processed simultaneously with the end cap, which can reduce the manufacturing difficulty of the via and improve the processing yield of the via.

[0049] In a second aspect, an embodiment of the present application further provides a battery, comprising the battery cell described above.

[0050] In the above technical solution, the battery cell is provided with a through hole on the pole, the conductive part of the electrode assembly is passed through the through hole, and a sealed connection is performed between the through hole and the conductive part 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.

[0051] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the battery cell described above, or the battery described above.

[0052] In the above technical solution, the use of the above-mentioned 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

[0053] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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 relevant drawings can be obtained based on these drawings without creative work.

[0054] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0055] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0056] FIG3 is a schematic diagram of a partial structure of a battery cell provided in some embodiments of the present application;

[0057] FIG4 is a first structural diagram of a pole and a conductive portion provided in some embodiments of the present application;

[0058] FIG5 is a first structural diagram of a pole provided in some embodiments of the present application;

[0059] FIG6 is a second structural diagram of a pole and a conductive portion provided in some other embodiments of the present application;

[0060] FIG7 is a third structural diagram of a pole and a conductive portion provided in some further embodiments of the present application;

[0061] FIG8 is a second schematic diagram of a partial structure of a battery cell provided in some embodiments of the present application;

[0062] FIG9 is a second schematic diagram of the structure of a pole provided in some embodiments of the present application;

[0063] FIG10 is a third structural diagram of a pole provided in some embodiments of the present application.

[0064] Icons: 1000, vehicle; 100, battery; 10, housing; 11, first housing body; 12, second housing body; 20, battery cell; 21, housing assembly; 211, housing; 2111, first wall; 2112, through-hole; 2011, housing; 2012, end cap; 212, pole; 2121, through-hole; 2121a, first opening; 2121b, second opening; 2121c, centerline of hole; 2122, first surface; 2123, avoidance groove; 2124, guide opening; 2125, connection area; 2021, column portion; 2022, first plate portion; 2023, second plate portion; 22, electrode assembly; 221, conductive portion; 2211, distal end portion; 23, first connecting portion; 23a, outer contour surface; 24. Adapter; 24a. Accommodating portion; 25. Second connecting portion; 26. Sealing member; 200. Controller; 300. Motor; X. First direction; Y. Second direction; Z. Third direction. DETAILED DESCRIPTION

[0065] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0066] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" 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-secondary relationship.

[0067] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0068] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0069] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0070] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0071] The term "plurality" used in this application refers to two or more (including two).

[0072] In this 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 this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0073] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or battery pack. A battery generally includes a casing that encloses one or more battery cells or multiple battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0074] A battery cell includes a casing, an electrode assembly, and an electrolyte. The casing is used to hold the electrode assembly and the electrolyte. The electrode assembly consists 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 the positive electrode tab. 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 consists of a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector uncoated with the negative active material layer protrudes from the negative current collector coated with the negative active material layer. The negative current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon, silicon, or other materials. To ensure that high currents can pass without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together.

[0075] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the embodiments of the present application are not limited thereto.

[0076] New energy vehicles have experienced rapid growth in recent years. Within the electric vehicle sector, power batteries, as the power source, play an irreplaceable and crucial role. A battery consists of a housing and multiple cells housed within it. Currently, increasing the energy density of each cell is a pressing challenge to enhance battery energy storage capacity.

[0077] 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 inside of the shell. As a result, the tabs occupy a certain space, the space used by the electrode assembly is reduced, and the space between the electrode assembly and the tabs in the shell is wasted, which is not conducive to maximizing the size of the electrode assembly to utilize the space in the shell, and is therefore not conducive to improving the energy density of the battery cell.

[0078] Based on the above considerations, in order to solve the problem that the tabs are arranged inside the casing, occupying space and thus preventing the electrode assembly from being maximized, which is detrimental to improving the energy density of the battery cell, the inventors have designed a battery cell comprising a casing assembly and an electrode assembly. The casing assembly comprises a casing and a terminal. The casing has a first wall with a through-hole formed in the first wall, the terminal extending through the through-hole, and the terminal extending through a via hole extending through the terminal to connect the inside and outside of the casing. The electrode assembly is disposed within the casing and comprises a conductive portion extending through the via hole. A first connecting portion is formed between the conductive portion and the via hole, and the first connecting portion seals the via hole.

[0079] In a battery cell of this structure, the pole is mounted on the first wall of the housing through a through-hole, and the electrode assembly can be mounted on the pole through a through-hole provided by the conductive portion through the pole. With this structure, on the one hand, the through-hole can accommodate the conductive portion, reducing the volume occupied by the conductive portion on the inside of the housing, thereby increasing the available space for the electrode assembly inside the housing, which is beneficial to increasing the size of the electrode assembly and improving the energy density of the battery cell. On the other hand, because the conductive portion is provided through the through-hole, the installation between the conductive portion and the pole is more reliable, which can reduce the probability of the conductive portion and the pole falling off, and is beneficial to improving the reliability of the battery cell. Secondly, the first connecting portion formed between the conductive portion and the through-hole can seal the through-hole, eliminating the need for additional components to seal the through-hole, thereby reducing the number of components in the battery cell and reducing the weight, thereby further improving the energy density of the battery cell.

[0080] The battery cells or batteries disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system including the battery cells, batteries, and electrical devices disclosed in this application can be used, which is beneficial to expand the scope of application of the battery cells.

[0081] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. 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. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0082] 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.

[0083] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can 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 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. 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.

[0084] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also 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.

[0085] Please refer to Figure 2, which is an exploded view of the structure of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a plurality of battery cells 20, which are intended to be accommodated within the housing 10. The housing 10 is used to provide an assembly space for the battery cells 20, and the housing 10 can adopt a variety of structures. In some embodiments, the housing 10 can include a first housing body 11 and a second housing body 12, which cover each other and together define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open, and the first housing body 11 can be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define an assembly space. The first housing body 11 and the second housing body 12 can also be hollow structures with one end open, with the open side of the first housing body 11 covering the open side of the second housing 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.

[0086] In the battery 100, the multiple battery cells 20 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery 100 can be constructed by first connecting the multiple battery cells 20 in series, in parallel, or in a hybrid configuration to form a battery module, which is then connected in series, in parallel, or in a hybrid configuration to form a single structure and housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0087] Referring to Figure 2, the battery 100 may include multiple rows of battery cells 20, which are arranged along the length of the housing 10, and each row of battery cells 20 includes multiple battery cells 20 arranged along the width of the housing 10. Alternatively, multiple rows of battery cells 20 are arranged along the width of the housing 10, and each row of battery cells 20 includes multiple battery cells 20 arranged along the length of the housing 10. Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes. For example, the battery cell 20 is cylindrical.

[0088] According to some embodiments of the present application, referring to Figure 3, an 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 a pole 212, the outer shell 211 has a first wall 2111, the first wall 2111 is provided with a through hole 2112, the pole 212 is passed through the through hole 2112, the pole 212 is provided with a through hole 2121, the through hole 2121 passes through the pole 212 to connect the inner and outer sides of the 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 passed through 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.

[0089] The housing 211 may be a container for accommodating the electrode assembly 22. The housing 211 may be, but is not limited to, an aluminum housing, a steel housing, or the like. The housing 211 may have multiple housing walls. For example, the housing 211 may be, but is 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 be one of the multiple housing walls. For example, the first wall 2111 may be one of the top wall, side wall, or bottom wall of the housing 211.

[0090] 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 the pole 212 of an adjacent battery cell 20.

[0091] The conductive portion 221 may refer to a conductive component extending from the positive electrode sheet or the negative electrode sheet. The conductive portion 221 may be a tab of the positive electrode sheet or the negative electrode sheet. The conductive portion 221 may be in the form of, but not limited to, a sheet, a line, or a block. Before being inserted into the via 2121, the conductive portion 221 may be shaped by ultrasonic welding.

[0092] The first connection portion 23 may be a structure that can be used to seal the via 2121 and the conductive portion 221. For example, the first connection portion 23 may be a weld fusion portion formed when the pole 212 and the conductive portion 221 are welded. The weld fusion portion may be a structure formed by melting and cooling the pole 212, the conductive portion 221, and the solder. For example, the conductive portion 221 and the via 2121 may be connected by laser welding with a filler wire, thereby sealing the conductive portion 221 and the via 2121. Alternatively, the first connection portion 23 may be adhesive, etc.

[0093] By sealing between the via hole 2121 and the conductive portion 221 through the first connecting portion 23, it is possible to reduce the entry of impurities and other contaminants from the external environment into the housing 211, thereby improving the stability of the interior of the battery cell 20 and the reliability of the battery cell 20. Secondly, considering the sealing requirements, if a cover plate is provided to seal the via hole 2121, the number of parts will be large, and the weight of the battery cell 20 will increase. In this application, by sealing between the via hole 2121 and the conductive portion 221 through the first connecting portion 23, sealing parts such as a cover plate can be eliminated, thereby reducing the number of parts, reducing the weight of the battery cell 20, and thereby improving the energy density of the battery cell 20.

[0094] In the above technical solution, the terminal 212 is mounted on the first wall 2111 of the housing 211 via the through-hole 2112, and the electrode assembly 22 is mounted on the terminal 212 via the through-hole 2121 provided in the terminal 212 by the conductive portion 221. On the one hand, the through-hole 2121 can accommodate the conductive portion 221, reducing the volume occupied by the conductive portion 221 inside the housing 211, thereby increasing the available space for the electrode assembly 22 within the housing 211, thereby facilitating an increase in the size of the electrode assembly 22 and improving the energy density of the battery cell 20. On the other hand, the first connecting portion 23 formed between the conductive portion 221 and the through-hole 221 can seal the through-hole 2121, eliminating the need for additional components to seal the through-hole 2121. This can reduce the number of components in the battery cell 20, simplify the manufacturing process of the battery cell 20, reduce weight, lower costs, and further improve the energy density of the battery cell 20. Since the conductive portion 221 is passed through the through hole 2121 , the conductive portion 221 and the pole 212 are reliably mounted, which can reduce the probability of the conductive portion 221 and the pole 212 falling off, thereby improving the reliability of the battery cell 20 .

[0095] A sealing member 26 may be provided between the pole 212 and the through hole 2112 to seal the pole 212 and the through hole 2112. For example, the sealing member 26 may be a sealing ring.

[0096] In some embodiments of the present application, as shown in Figure 4, 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 through hole 2121 in the first direction X is greater than the size of the through hole 2121 in the second direction Y.

[0097] 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, width, and height directions of the housing 211 (see FIG3 ). Alternatively, the first direction X may refer to a direction forming an angle with one of the length, width, and height directions of the housing 211, and the second direction Y may refer to a direction forming an angle with another of the length, width, and height directions of the housing 211. The first direction X and the second direction Y may be perpendicular to each other or at an angle to each other.

[0098] The dimension of the via 2121 in the first direction X is greater than the dimension of the via 2121 in the second direction Y. This means that the via 2121 has a length and a width, that is, the via 2121 can be a strip-shaped hole or a narrow slit. Correspondingly, the dimension of the conductive portion 221 in the first direction X is greater than the dimension of the conductive portion 221 in the second direction Y. That is, the cross-section of the conductive portion 221 can be strip-shaped or narrow, and the conductive portion 221 can be sheet-shaped. In this manner, the surface area of ​​the conductive portion 221 can be relatively large, which helps reduce the internal resistance of the conductive portion 221 and increase the current density of the conductive portion 221.

[0099] 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 part 221 can also be a strip-shaped or narrow slit. On the one hand, it can increase the connection surface between the conductive part 221 and the via 2121, and improve the connection reliability between the conductive part 221 and the pole 212. On the other hand, it is beneficial to increase the surface area of ​​the conductive part 221, reduce the internal resistance of the conductive part 221, and thereby increase the current density of the conductive part 221.

[0100] In some embodiments of the present application, as shown in FIG. 4( 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 .

[0101] In the above technical solution, in the first direction X, the size of the conductive portion 221 can be smaller than the size of the via hole 2121, so that a gap can be formed between the conductive portion 221 and the via hole 2121. This gap facilitates the installation of the conductive portion 221 into the via hole 2121, thereby improving the success rate of the installation of the conductive portion 221. In the first direction X, the size of the conductive portion 221 can also be equal to the size of the via hole 2121, so that there is no gap between the conductive portion 221 and the via hole 2121. This allows the conductive portion 221 and the via hole 2121 to fit tightly together and helps improve the sealing between the conductive portion 221 and the via hole 2121.

[0102] In some embodiments of the present application, as shown in FIG. 4( 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 0 mm ≤ L2 − L1 ≤ 4 mm.

[0103] L2-L1 can be, but is not limited to, 0mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4.0mm, and the like.

[0104] It can be understood that in the first direction X, L2-L1 can be 0mm, 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 shell 211, thereby improving the reliability of the battery cell 20.

[0105] In the first direction X, if L2-L1 is greater than 4 mm, the gap between the conductive portion 221 and the via hole 2121 is larger. Although this allows the conductive portion 221 to be relatively easily installed in the via hole 2121, the larger gap is not conducive to improving the sealing between the conductive portion 221 and the via hole 2121 in the first direction X. By setting L2-L1 to be less than or equal to 4 mm, a more appropriate gap is achieved between the conductive portion 221 and the via hole 2121. This not only facilitates the installation of the conductive portion 221 in the via hole 2121 but also reduces the difficulty of sealing between the conductive portion 221 and the via hole 2121, thereby improving the sealing between the conductive portion 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.

[0106] 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 conducive to improving the success rate of installing the conductive part 221 into the via hole 2121.

[0107] In the above technical solution, by setting the difference between the size L1 of the conductive part 221 and the size L2 of the through-hole 2121 in the first direction X within 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 through-hole 2121 in the first direction X. On the one hand, when there is no gap, the sealing between the conductive part 221 and the through-hole 2121 can be improved. On the other hand, when the gap is small, the installation difficulty between the conductive part 221 and the through-hole 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 through-hole 2121.

[0108] In some embodiments of the present application, as shown in FIG. 4( b ), in the first direction X, the size of the first connection portion 23 is larger than the size of the via hole 2121 .

[0109] The first connection portion 23 may be, but is not limited to, a welded fusion portion, an adhesive, or other components. For example, the first connection portion 23 is a welded fusion portion, and the portion of the via 2121 and the conductive portion 221 are welded to form the first connection portion 23. In this case, the dimension of the via 2121 in the first direction X may refer to the dimension of the portion away from the first connection portion 23 and not deformed.

[0110] In the above technical solution, the first connecting portion 23 can cover the via hole 2121 in the first direction X, thereby achieving a better sealing effect and reducing the probability of poor sealing between the via hole 2121 and the conductive portion 221 .

[0111] In some embodiments of the present application, as shown in FIG. 4( 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 .

[0112] In the above technical solution, in the second direction Y, the size of the conductive portion 221 can be smaller than the size of the via hole 2121, so that there can be a gap between the conductive portion 221 and the via hole 2121, which facilitates the installation of the conductive portion 221 into the via hole 2121 and improves the success rate of the installation of the conductive portion 221. In the second direction Y, the size of the conductive portion 221 can also be equal to the size of the via hole 2121, so that there can be no gap between the conductive portion 221 and the via hole 2121. This allows the conductive portion 221 and the via hole 2121 to fit tightly together, which helps to improve the sealing between the conductive portion 221 and the via hole 2121.

[0113] In some embodiments of the present application, as shown in FIG. 4( 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.

[0114] W2-W1 can be, but is 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 can refer to the width. In the electrode assembly 22, the positive electrode sheet and the negative electrode sheet can be multi-layered, and the conductive portion 221 can be formed by stacking a plurality of positive electrode sheets or a plurality of negative electrode sheets extending therefrom. 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 the negative electrode sheet).

[0115] It can be understood that in the second direction Y, W2-W1 can be 0mm, 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 shell 211, thereby improving the reliability of the battery cell 20.

[0116] Because the dimension of via 2121 in the first direction X is greater than its dimension in the second direction Y, i.e., the first direction X is the length direction of via 2121, and the second direction Y is the width direction of via 2121. In the second direction Y, if W2-W1 is greater than 0.1 mm, according to the volume calculation formula for a rectangular space, the gap between the conductive portion 221 and the via 2121 will increase significantly, which is not conducive to improving the sealing between the conductive portion 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 portion 221 and the via 2121 is more appropriate, which can facilitate the installation of the conductive portion 221 into the via 2121 while reducing the difficulty of sealing between the conductive portion 221 and the via 2121, thereby improving the sealing between the conductive portion 221 and the via 2121.

[0117] 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.

[0118] 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.

[0119] In some embodiments of the present application, as shown in FIG. 4( b ), in the second direction Y, the size of the first connection portion 23 is larger than the size of the via hole 2121 .

[0120] The first connection portion 23 may be, but is not limited to, a welded fusion portion, an adhesive, or other components. For example, the first connection portion 23 is a welded fusion portion, and the portion of the via 2121 and the conductive portion 221 are welded to form the first connection portion 23. In this case, the dimension of the via 2121 in the second direction Y may refer to the dimension of the portion away from the first connection portion 23 and not deformed.

[0121] In the above technical solution, the first connecting portion 23 can cover the via hole 2121 in the second direction Y, thereby achieving a better sealing effect and reducing the probability of poor sealing between the via hole 2121 and the conductive portion 221 .

[0122] In some embodiments of the present application, as shown in FIG. 3 , the conductive portion 221 has a distal portion 2211 away from the inner side of the housing 211 , and the distal portion 2211 is connected to the via 2121 through the first connecting portion 23 .

[0123] The via 2121 can be a deep hole that penetrates the terminal 212. The via 2121 located inside the housing 211 is considered the inner side, while the via 2121 located closer to the outside of the housing 211 is considered the outer side. The distal end 2211 can refer to the end closer to the outside of the via 2121. The distal end 2211 can be located within the via 2121, or it can be flush with the outer edge of the via 2121, or it can extend beyond the via 2121.

[0124] 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.

[0125] Secondly, the first connecting portion 23 can be arranged outside the conductive portion 221 and the via 2121, which reduces the difficulty of forming the first connecting portion 23 and improves the forming rate of the first connecting portion 23, thereby reducing costs. For example, if welding is used between the conductive portion 221 and the via 2121, the welding gun can be used to weld the distal portion 2211 outside the via 2121. This makes welding gun placement easier and increases the chance of forming a welded fusion portion.

[0126] In the above technical solution, the conductive portion 221 is connected to the via 2121 at the distal end 2211 via the first connecting portion 23. On the one hand, the first connecting portion 23 is located outside the via 2121, making it easier to form, reducing the difficulty of connecting the conductive portion 221 and the via 2121, and improving product yield. On the other hand, the first connecting portion 23 is connected between the distal end 2211 and the via 2121, effectively preventing contaminants such as impurities and large particles from penetrating into the via 2121. This reduces the amount of contaminants that enter the gap formed between the conductive portion 221 and the via 2121, reducing the likelihood of electrochemical corrosion between the conductive portion 221 and the terminal 212, and thus improving the reliability of the battery cell 20.

[0127] In some embodiments of the present application, as shown in FIG3 to FIG5 , 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 connection portion 23 is located in the avoidance groove 2123 .

[0128] The first surface 2122 may be, but is not limited to, the top surface or side surface of the pole 212. For example, the housing 211 may have a third direction Z, which 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. In other words, the first surface 2122 may be the top surface of the pole 212 in the third direction Z, or may be the side surface of the pole 212 in the first direction X or the side surface in the second direction Y.

[0129] 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 is formed. In this case, the avoidance groove 2123 can serve to accommodate the welding excess height.

[0130] In the above technical solution, the avoidance groove 2123 serves to accommodate the first connecting portion 23, thereby reducing the volume of the assembly formed by the terminal 212, the conductive portion 221, and the first connecting portion 23, thereby saving space. Furthermore, the provision of the avoidance groove 2123 reduces the weight of the terminal 212, thereby increasing the energy density of the battery cell 20.

[0131] In some embodiments of the present application, as shown in FIG. 3 , the first connection portion 23 has an outer contour surface 23 a facing the outside of the avoidance groove 2123 , and the outer contour surface 23 a does not protrude from the first surface 2122 .

[0132] The outer contour surface 23a may be, but is not limited to, an arc, a rectangle, or a cone. In the above technical solution, by configuring the outer contour surface 23a of the first connecting portion 23 not to protrude beyond the first surface 2122, the probability of the first surface 2122 being a flat surface can be increased. When the terminal 212 is connected to the adapter 24 via the first surface 2122, the terminal 212 and the adapter 24 can abut against each other face to face, which helps to improve the connection reliability between the terminal 212 and the adapter 24, and thus improve the reliability of the battery cell 20.

[0133] In some embodiments of the present application, as shown in FIG5 , the housing 211 has a third direction Z, which is perpendicular to the first wall 2111 . In the third direction Z, the size of the avoidance groove 2123 is H1, where 1 mm ≤ H1.

[0134] In the above technical solution, the third direction Z can be the depth direction of the avoidance groove 2123. The conductive portion 221 and the terminal 212 can be welded together, and the height of the welded fusion portion 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 first connecting portion 23 and increase the probability of fully accommodating the first connecting portion 23. Furthermore, the dimension H1 of the avoidance groove 2123 being greater than or equal to 1 mm can further reduce the weight of the terminal 212 and increase the energy density of the battery cell 20.

[0135] In some embodiments of the present application, as shown in FIG. 4( b ) and FIG. 5 , in the second direction Y, the size of the avoidance groove 2123 is W3 , where W3 ≥ 2 mm.

[0136] In the above technical solution, if W3 is less than 2 mm, the dimension of the avoidance groove 2123 in the second direction Y is relatively small. In order to accommodate the first connecting portion 23 within the avoidance groove 2123, the dimension of the first connecting portion 23 in the second direction Y is correspondingly relatively small. This is not conducive to the first connecting portion 23 sealing the conductive portion 221 and the via 2121, nor is it conducive to improving the connection reliability between the conductive portion 221 and the terminal 212. By setting W3 to be greater than 2 mm, the dimension of the avoidance groove 2123 in the second direction Y is more appropriate, and the dimension of the first connecting portion 23 within the avoidance groove 2123 can be relatively large, thereby facilitating the first connecting portion 23 sealing the conductive portion 221 and the via 2121, and improving the connection reliability between the conductive portion 221 and the terminal 212.

[0137] In some embodiments of the present application, as shown in FIG. 4( 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 ≥ 2 mm.

[0138] 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.

[0139] In the above technical solution, if the dimension L3 of the avoidance groove 2123 is 2 mm smaller than the dimension L1 of the conductive portion 221 in the first direction X, the space left by the avoidance groove 2123 for the first connecting portion 23 in the first direction X is limited. Even when the first connecting portion 23 contacts the wall of the avoidance groove 2123 in the first direction X, the dimension is very small, which is detrimental to the sealing between the conductive portion 221 and the via hole 2121, as well as the connection between the conductive portion 221 and the terminal 212. In other words, by making the dimension L3 of the avoidance groove 2123 greater than or equal to 2 mm larger than the dimension L1 of the conductive portion 221, a relatively large space is created between the avoidance groove 2123 and the conductive portion 221 in the first direction X for forming the first connecting portion 23, thereby facilitating the sealing between the conductive portion 221 and the via hole 2121 and improving the connection reliability between the conductive portion 221 and the terminal 212.

[0140] In some embodiments of the present application, as shown in Figures 6 and 8, 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.

[0141] 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 busbar.

[0142] In the above technical solution, the first connection portion 23 can protrude from the first surface 2122. In this case, the first connection portion 23 can be unobstructed on all sides, making it easier to form the first connection portion 23 and improving the molding efficiency of the first connection portion 23. The receiving portion 24a of the adapter 24 can accommodate the first connection portion 23, making the assembly formed by the terminal 212, the conductive portion 221, and the adapter 24 relatively small, reducing weight, and improving the energy density of the battery cell 20.

[0143] Furthermore, as shown in FIG8 , 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 remaining part is located in the avoidance groove 2123 .

[0144] In the above technical solution, the accommodating portion 24a and the avoidance groove 2123 can simultaneously accommodate the first connecting portion 23. While meeting the requirements 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 easily damaged.

[0145] In some embodiments of the present application, as shown in FIG. 7 , the pole 212 has a first surface 2122 , the via 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 .

[0146] As mentioned above, the first connection portion 23 may be, but is not limited to, a welded fusion portion, adhesive, or the like. After being formed, the first connection portion 23 will protrude beyond the first surface 2122. In this case, the first connection portion 23 may be processed so that the outer contour surface 23a is flush with the first surface 2122. For example, if the first connection portion 23 is a welded fusion portion, a weld bead may be formed at the weld bead. This weld bead may be ground away to maintain a flat first surface 2122.

[0147] 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.

[0148] In some embodiments of the present application, as shown in Figure 10, the through hole 2121 is formed with a first hole 2121a on the outside of the pole 212, and a second hole 2121b is formed on the inside of the pole 212, and the projection of the first hole 2121a on the first wall 2111 and the projection of the second hole 2121b on the first wall 2111 do not overlap.

[0149] 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.

[0150] For example, when the first connection portion 23 is a welded fusion portion, during the welding process of the first connection portion 23, the laser light emitted by the laser welding gun is unlikely to pass through the second opening 2121b to reach the electrode assembly 22, thereby reducing the probability of laser ablation damage to the electrode assembly 22. Again for example, when the first connection portion 23 is adhesive, during the molding of the first connection portion 23, the adhesive will not drip through the second opening 2121b onto the electrode assembly 22 inside the housing 211, thereby reducing the impact of the adhesive on the internal environment of the housing 211.

[0151] 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.

[0152] In some embodiments of the present application, as shown in FIG. 10 , the through hole 2121 has a hole center axis 2121 c , and the hole center axis 2121 c is tilted relative to the first wall 2111 .

[0153] In the above technical solution, the center axis 2121c of the through hole 2121 is tilted relative to the first wall 2111, that is, the through hole 2121 is an inclined hole arranged relative to the first wall 2111, which 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.

[0154] In some embodiments of the present application, as shown in FIG. 10 , the angle between the hole center axis 2121 c and the first wall 2111 is α, where 45 degrees ≤ α ≤ 90 degrees.

[0155] It can be understood that the angle α between the hole axis 2121c and the first wall 2111 can be but 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.

[0156] 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.

[0157] In some embodiments of the present application, as shown in FIG10 , 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 from the inner side of the pole 212 to the outer side of the pole 212 .

[0158] The inner side of the pole 212 may refer to the side closer to the inside of the housing 211. That is, a guide opening 2124 is formed between the end of the through hole 2121 closer to the inside of the housing 211 and the pole 212. The guide opening 2124 may be flared. For example, a chamfer may be formed between the pole 212 and the through hole 2121 to form the guide opening 2124, or a rounded corner may be formed between the pole 212 and the through hole 2121 to form the guide opening 2124.

[0159] 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, the conductive part 221 can be installed into the through hole 2121 relatively easily. The conductive part 221 can first enter the guide opening 2124 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.

[0160] 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 passed through 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.

[0161] The column portion 2021 may be a columnar component, and the column portion 2021 may be, but not limited to, a cylindrical or rectangular column. The first plate portion 2022 and the second plate portion 2023 may be plate-shaped components, and the shapes of the first plate portion 2022 and the second plate portion 2023 may be, but not limited to, flat plates.

[0162] 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 have an I-shaped structure. The first plate portion 2022 and the second plate portion 2023 are located on both the inside and outside of the housing 211, which can reduce the probability of the pole 212 being separated from the housing 211 and improve the installation reliability of the pole 212 and the housing 211. The via 2121 can be formed in the first plate portion 2022, the column portion 2021, and the second plate portion 2023. The accommodation space formed within the via 2121 is relatively large, which can accommodate a larger conductive portion 221, thereby improving the connection reliability between the conductive portion 221 and the pole 212. It also has a better effect of reducing the mass of the pole 212, which is conducive to increasing the energy density of the battery cell 20.

[0163] In some embodiments of the present application, as shown in FIG8 , a connection region 2125 is provided on the pole 212 . The connection region 2125 is used to connect to the adapter 24 , and a second connection portion 25 is formed between the connection region 2125 and the adapter 24 .

[0164] As previously mentioned, since the conductive portion 221 can pass through 2121 and the conductive portion 221 and the passage 2121 can be sealed and connected via the first connection portion 23, there is no need to provide a separate cover plate or other components on the pole 212. The pole 212 can be directly connected to the adapter 24 by providing a connection region 2125. In other words, the connection region 2125 can refer to a connection position on the pole 212 for connecting to the adapter 24. There can be multiple connection regions 2125 on the pole 212. Increasing the number of connection regions 2125 can improve the connection reliability between the pole 212 and the adapter 24. For example, there are two connection regions 2125 on the pole 212.

[0165] The second connection portion 25 may be a welding fusion portion, and the welding fusion portion may specifically be a structure formed by welding and melting the pole 212 and the adapter 24 .

[0166] In the above technical solution, the pole 212 is connected to the adapter 24 through 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 up additional components between the two, which can reduce the number of components and thus reduce the weight of the battery cell 20, which is beneficial to improving the energy density of the battery cell 20.

[0167] In some embodiments of the present application, as shown in FIG3 and FIG8 , the housing 211 includes a shell body 2011 and an end cover 2012 . The end cover 2012 covers the opening of the shell body 2011 . The shell body 2011 or the end cover 2012 forms a first wall 2111 .

[0168] The housing 2011 may be, but is not limited to, cylindrical, square, or the like. The housing 2011 may have multiple walls, and the first wall 2111 may be a wall of the housing 2011 located in any one of the first direction X, the second direction Y, and the third direction Z. The end cap 2012 may be a cover plate used to close the opening of the housing 2011. The first wall 2111 may also be formed on the end cap 2012. The end cap 2012 may be provided at one end of the housing 2011 located in any one of the first direction X, the second direction Y, and the third direction Z.

[0169] In the above technical solution, the first wall 2111 can be provided on the housing 2011, that is, the through hole 2121 is provided on the housing 2011, and the pole 212 is mounted on the housing 2011. This approach can simplify the structure of the end cap 2012, reduce the number of components on the end cap 2012, and reduce the weight of the end cap 2012, thereby improving the connection reliability between the end cap 2012 and the housing 2011. The first wall 2111 can also be provided on the end cap 2012, that is, the through hole 2121 is provided on the end cap 2012, and the pole 212 is mounted on the end cap 2012. Because the end cap 2012 can be processed separately from the housing 2011, the through hole 2121 can be processed simultaneously with the end cap 2012, thereby reducing the manufacturing difficulty of the through hole 2121 and improving the processing yield of the through hole 2121.

[0170] In a second aspect, an embodiment of the present application further provides a battery 100 , comprising the aforementioned battery cell 20 .

[0171] The battery 100 may be a battery module, which may include a plurality of battery cells 20. The battery 100 may also be referred to as a battery pack, which may include a plurality of battery modules.

[0172] 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 thus improve the energy density of the battery 100.

[0173] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the battery cell 20 described above, or the battery 100 described above.

[0174] 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.

[0175] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0176] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, wherein: The invention comprises the battery cell according to any one of claims 1 to 21.

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

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