Battery cell, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, an electrode assembly and an electrode terminal, the shell comprises a wall part, the wall part comprises a main body part and a connecting part, the connecting part is provided with an electrode lead-out hole, and the main body part is connected to the connecting part. The electrode assembly is accommodated in the housing. The electrode terminal is provided in the electrode lead-out hole and is electrically connected to the electrode assembly, and the outer peripheral surface of the electrode terminal is recessed to form a recess. And the connecting part extends into the concave part and is in sealing fit with the electrode terminal. According to the embodiment of the invention, the reliability of the battery monomer can be 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] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric bicycles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes, and power tools. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, ion battery cells, and secondary alkaline zinc-manganese battery cells.

[0003] In the development of battery technology, how to improve the reliability of battery cells is a technical problem that needs to be solved urgently. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery, and an electrical device, which are conducive to improving the reliability of the battery cell.

[0005] In a first aspect, the present application provides a battery cell, comprising: a shell, comprising a wall portion, the wall portion comprising a main body portion and a connecting portion, the connecting portion having an electrode lead-out hole, the main body portion being connected to the connecting portion; an electrode assembly, housed in the shell; an electrode terminal, disposed in the electrode lead-out hole and electrically connected to the electrode assembly, the outer peripheral surface of the electrode terminal being recessed to form a recess; wherein the connecting portion extends into the recess and is sealed with the electrode terminal.

[0006] In some embodiments of the first aspect, the battery cell includes a shell, an electrode assembly and an electrode terminal. The outer peripheral surface of the electronic terminal is provided with a recess, and the connecting portion can extend into the recess to seal with the electrode terminal, which is beneficial to improving the sealing between the connecting portion and the electronic terminal, and is also beneficial to increasing the connection area between the connecting portion and the electrode terminal to improve the connection strength between the two. In addition, the design of the connecting portion extending into the recess to seal with the electrode terminal can also limit the electrode terminal to prevent it from displacement, thereby helping to improve the reliability of the battery cell.

[0007] In some embodiments, along the thickness direction of the wall portion, the ratio of the thickness dimension d1 of the connection portion to the thickness dimension d2 of the main body portion satisfies the following: 0.2 ≤ d1 / d2 ≤ 1.2. Setting the ratio of the thickness dimensions of the connection portion to the main body portion within this range not only improves the seal between the connection portion and the electrode terminal, but also enhances the structural strength of the wall portion, thereby improving the reliability of the battery cell.

[0008] In some embodiments, along the thickness direction of the wall portion, the ratio of the thickness dimension d1 of the connection portion to the thickness dimension d2 of the main body portion satisfies the following: 0.5 ≤ d1 / d2 ≤ 0.7. By further limiting the thickness ratio of the connection portion to the main body portion within the aforementioned range, the sealing between the connection portion and the electrode terminal and the structural strength of the wall portion can be further improved, thereby further enhancing the reliability of the battery cell.

[0009] In some embodiments, at least one side surface of the connecting portion along the thickness direction of the wall portion has a gap with any side surface of the main body portion along the thickness direction. This arrangement is conducive to improving the connection strength between the connecting portion and the main body portion.

[0010] In some embodiments, the ratio of the length L of the connection portion along the first direction to the thickness d1 of the connection portion along the thickness direction of the wall portion satisfies the following condition: 10 ≤ L / d1 ≤ 1, and the first direction intersects the thickness direction. By setting the ratio of the length L of the connection portion to the thickness d1 within the aforementioned range, the battery cell can achieve both sealing and structural strength requirements, thereby improving the reliability of the battery cell.

[0011] In some embodiments, the ratio of the length dimension L of the connection portion to the thickness dimension d1 of the connection portion satisfies the following: 6 ≤ L / d1 ≤ 1. By further limiting the ratio of the length dimension L to the thickness dimension d1 of the connection portion to within the aforementioned range, the sealing between the connection portion and the electrode terminal and the structural strength of the wall portion can be further improved, thereby further enhancing the reliability of the battery cell.

[0012] In some embodiments, the connection between the connecting portion and the main body forms an angle α, and the angle α satisfies the following conditions: 60°≤α≤160°. Setting the angle α between the connecting portion and the main body within the above range can help reduce the impact of welding the electrode terminal to other components on the wall, thereby improving the structural strength of the wall and, in turn, the reliability of the battery cell.

[0013] In some embodiments, the angle α satisfies: 100°≤α≤120°. By further limiting the angle α at the connection between the connecting portion and the main body to the above range, the impact of the electrode terminal welding on the wall portion can be better reduced, thereby better improving the structural strength of the wall portion.

[0014] In some embodiments, an electrode terminal includes a main body, a first end, and a second end. The first end and the second end are disposed oppositely on opposite sides of the main body along the thickness direction of the wall portion. The main body is inserted into the electrode lead-out hole, and the second end is disposed toward the electrode assembly. The main body, the first end, and the second end together form a recess. Along the thickness direction, the ratio of the thickness dimension d3 of the second end to the thickness dimension d1 of the connecting portion satisfies the following conditions: 1 ≤ d3 / d1 ≤ 10. By setting the ratio of the thickness dimension d3 of the second end to the thickness dimension d1 of the connecting portion within the aforementioned range, the battery cell can simultaneously meet both energy density and structural strength requirements, thereby improving the energy density and reliability of the battery cell.

[0015] In some embodiments, the ratio of the thickness dimension d3 of the second end portion to the thickness dimension d1 of the connecting portion satisfies the following: 2 ≤ d3 / d1 ≤ 3. By further limiting the ratio of the thickness dimension d3 of the second end portion to the thickness dimension d1 of the connecting portion to within the aforementioned range, the energy density and reliability of the battery cell can be further improved.

[0016] In some embodiments, the electrode terminal is recessed along the thickness of the wall toward one side of the electrode assembly to form a groove, with the grooves spaced apart from the recesses. This arrangement facilitates connection between the electrode terminal and components within the housing and also helps increase the energy density of the battery cell.

[0017] In some embodiments, the battery cell further includes a seal, at least a portion of which is disposed in the recess, and the seal is sleeved over the electrode terminal and sealed to the connecting portion and the electrode terminal. The provision of the seal facilitates ensuring a sealed fit between the connecting portion and the electrode terminal.

[0018] In some embodiments, the housing includes a shell and an end cap, wherein the shell has an opening, the end cap covers the opening, and the end cap includes a wall portion. This arrangement facilitates assembly and helps improve assembly efficiency.

[0019] In a second aspect, the present application provides a battery, comprising a battery cell provided according to any embodiment of the first aspect.

[0020] In a third aspect, the present application provides an electrical device, comprising a battery provided according to any embodiment of the second aspect, wherein the battery is used to provide electrical energy.

[0021] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to denote the same components. In the drawings:

[0023] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0024] Figure 2 A schematic diagram of an exploded structure of a battery provided in some embodiments of the present application;

[0025] Figure 3 A schematic structural diagram of a battery module provided in some embodiments of the present application;

[0026] Figure 4 A schematic diagram of an exploded structure of a battery cell provided in some embodiments of the present application;

[0027] Figure 5 A partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0028] Figure 6 A schematic diagram of a partial structure of a battery cell provided in some embodiments of the present application;

[0029] Figure 7 Schematic diagram of the partial structure of a battery cell provided in some other embodiments of the present application.

[0030] The accompanying drawings in the specific implementation manner are as follows:

[0031] 1-Vehicle; 1000-Battery; 2000-Controller; 3000-Motor; 100a-Battery Module; 100-Battery Cell; 200-Case; 210-First Case; 220-Second Case

[0032] 10-housing; 11-wall; 111-main body; 112-connecting portion; 1121-electrode lead-out hole; 101-end cover; 102-shell;

[0033] 20 - electrode assembly; 30 - electrode terminal; 31 - body; 32 - first end; 33 - second end; 301 - recess; 302 - groove;

[0034] 40-seal; 50-adapter;

[0035] X-thickness direction; Y-first direction. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0037] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0038] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0039] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly indicate the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0040] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0041] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0042] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0043] The development of battery technology requires consideration of multiple design factors, such as battery life, energy density, discharge capacity, charge and discharge rate, and other performance parameters. Furthermore, battery reliability must also be considered.

[0044] The battery mentioned in the embodiments of this 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 this application may include a battery module or a battery pack.

[0045] The battery cell may be a secondary battery cell. A secondary battery cell refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0046] In the related art, the battery cells have poor sealing and low connection strength after being sealed with the electrode terminals due to the unreasonable design of the position of the shell for sealing connection with the electrode terminals.

[0047] Based on the above technical problems, an embodiment of the present application provides a battery cell, which includes a main body and a connecting part, the connecting part having an electrode lead-out hole, and the main body is connected to the connecting part; an electrode assembly is accommodated in a shell; an electrode terminal is arranged in the electrode lead-out hole and electrically connected to the electrode assembly, and the outer peripheral surface of the electrode terminal is recessed to form a recess; wherein the connecting part extends into the recess and is sealed with the electrode terminal.

[0048] By providing a recess on the outer peripheral surface of the electronic terminal and extending the connecting part into the recess to be sealed and matched with the electrode terminal, it is beneficial to improve the sealing between the connecting part and the electronic terminal, and also beneficial to increase the connection area between the connecting part and the electrode terminal to improve the connection strength between the two. In addition, the design of the connecting part extending into the recess to be sealed and matched with the electrode terminal can also limit the electrode terminal to prevent it from displacement, thereby improving the reliability of the battery cell.

[0049] The technical solutions described in the embodiments of the present application are applicable to various battery-using devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0050] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the devices described above, but can also be applied to all devices that use batteries. However, for the sake of simplicity, the following embodiments are explained using electric vehicles as an example.

[0051] For example, Figure 1 As shown, Figure 1 This is a structural schematic diagram of a vehicle 1 according to one embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 3000, a controller 2000 and a battery 1000 may be provided inside the vehicle 1. The controller 2000 is used to control the battery 1000 to power the motor 3000. For example, a battery 1000 may be provided at the bottom, front or rear of the vehicle 1. The battery 1000 may be used to power the vehicle 1. For example, the battery 1000 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 1000 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0052] like Figure 2 and Figure 3 As shown, in order to meet different power requirements, the battery 1000 may include a plurality of battery cells 100, wherein the plurality of battery cells 100 may be connected in series, in parallel, or in hybrid connection, where hybrid connection refers to a mixture of series and parallel connection. The battery 1000 may also be referred to as a battery pack. Optionally, a plurality of battery cells 100 may first be connected in series, in parallel, or in hybrid connection to form a battery module 100a, and a plurality of battery modules 100a may then be connected in series, in parallel, or in hybrid connection to form the battery 1000. In other words, a plurality of battery cells 100 may directly form the battery 1000, or may first form the battery module 100a, and the battery module may then form the battery 1000.

[0053] In this application, the battery cells 100 may include lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, and the embodiments of this application do not limit this. The battery cells 100 may be cylindrical, flat, rectangular, or other shapes, and the embodiments of this application do not limit this. Battery cells 100 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.

[0054] like Figure 2 and Figure 3As shown, a battery 1000 according to an embodiment of the present application further includes a box body 200 , in which a plurality of battery cells 100 are accommodated. The box body 200 can protect the battery cells 100 .

[0055] The housing 200 may be a simple three-dimensional structure such as a single rectangular parallelepiped, cylinder, or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as rectangular parallelepiped, cylinder, or sphere, and the present embodiment is not limited thereto. The housing 200 may be made of an alloy material such as an aluminum alloy or an iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin, and the present embodiment is not limited thereto.

[0056] The housing 200 is used to accommodate the battery cells 100, and the housing 200 can be of various structures. In some embodiments, the housing 200 can include a first housing portion 210 and a second housing portion 220, and the first housing portion 210 and the second housing portion 220 cover each other, and the first housing portion 210 and the second housing portion 220 together define a housing cavity for accommodating the battery cells 100. The first housing portion 210 and the second housing portion 220 can both be hollow structures with one side open, and the open side of the first housing portion 210 covers the open side of the second housing portion 220 to form a housing 200 with a housing cavity. Of course, the first housing portion 210 and the second housing portion 220 can be of various shapes, such as a cylinder, a cuboid, etc. The first housing portion 210 can also be a plate-like structure, and the second housing portion 220 can be a hollow structure with one side open.

[0057] In order to improve the sealing performance after the first box body 210 and the second box body 220 are connected, a sealing member, such as a sealant, a sealing ring, etc., may be provided between the first box body 210 and the second box body 220 .

[0058] See also Figure 4 According to an embodiment of the present application, a battery cell 100 is provided, including a housing 10 , an electrode assembly 20 , and an electrode terminal 30 .

[0059] The housing 10 is a component used to create an internal environment for the battery cell 100. This internal environment can accommodate the electrode assembly 20, as well as the electrolyte and other components. Optionally, the housing 10 can be made of, but is not limited to, metal or non-metallic materials. For example, metal materials can include copper, aluminum, or stainless steel; non-metallic materials can include polyethylene, polypropylene, or polyvinyl chloride.

[0060] The shape of the housing 10 can be determined according to the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 is a rectangular parallelepiped structure, a rectangular housing 10 can be selected; if the electrode assembly 20 is a cylindrical structure, a cylindrical housing 10 can be selected.

[0061] As an example, the housing 10 includes a shell 102 and an end cover 101 . The shell 102 has an opening, and the end cover 101 is used to cover the opening.

[0062] The electrode terminal 30 can be used to electrically connect to the electrode assembly 20 to output or input electrical energy from the battery cell 100. The electrode terminal 30 can be electrically connected to the electrode assembly 20 by connecting to the tab 20a. The tab 20a electrically connected to the electrode terminal 30 can be a positive electrode tab or a negative electrode tab.

[0063] The tab 20a can be directly connected to the electrode terminal 30, for example, by welding, abutting or other means. Alternatively, the tab 20a can also be indirectly connected to the electrode terminal 30 through other conductive components (such as the adapter 50) to achieve electrical connection between the tab 20a and the electrode terminal 30.

[0064] The electrode assembly 20 is a component where electrochemical reactions occur in the battery cell 100 , and the housing 10 may contain one or more electrode assemblies 20 .

[0065] As an example, the electrode assembly 20 includes a positive electrode sheet and a negative electrode sheet. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 20, while the portions of the positive and negative electrode sheets not containing active material each constitute a tab 20a. The positive electrode terminal 30 can be used to electrically connect to the electrode assembly 20 to transmit or receive electrical energy from the battery cell 100.

[0066] During the charge and discharge process of the battery 1000 , the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 20 a is connected to the electrode terminal 30 to form a current loop.

[0067] The electrode assembly 20 may include any one of a cylindrical electrode assembly 20 , a rectangular electrode assembly 20 , and an elliptical electrode assembly 20 .

[0068] Please also refer to Figures 4 to 7According to an embodiment of the present application, a battery cell 100 is provided, comprising a housing 10, an electrode assembly 20, and an electrode terminal 30. The housing 10 comprises a wall portion 11, the wall portion 11 comprising a main body portion 111 and a connecting portion 112, the connecting portion 112 having an electrode lead-out hole 1121, and the main body portion 111 being connected to the connecting portion 112. The electrode assembly 20 is accommodated in the housing 10. The electrode terminal 30 is disposed in the electrode lead-out hole 1121 and is electrically connected to the electrode assembly 20, and the outer peripheral surface of the electrode terminal 30 is recessed to form a recess 301. The connecting portion 112 extends into the recess 301 and is sealed with the electrode terminal 30.

[0069] The wall portion 11 may be the end cover 101 or a wall of the housing 102. The shape of the wall portion 11 may be circular, rectangular, elliptical or other shapes.

[0070] The connecting portion 112 is arranged around the electrode lead-out hole 1121 , and the main body 111 can be connected to one side of the connecting portion 112 along the thickness direction X. The main body 111 can also be connected to the side of the connecting portion 112 along the first direction Y away from the electrode lead-out hole 1121 .

[0071] Alternatively, the electrode terminal 30 may be entirely located within the electrode lead-out hole 1121. Alternatively, a portion of the electrode terminal 30 may be located within the electrode lead-out hole 1121 and a portion may be located outside the electrode lead-out hole 1121. Alternatively, a portion of the electrode terminal 30 may be located within the housing 10 to facilitate connection with the electrode assembly 20 or the adapter 50. Alternatively, a portion of the electrode terminal 30 may be located on a side of the wall 11 away from the electrode assembly 20 to facilitate connection with the current collector.

[0072] The thickness direction X of the wall portion 11 can be in the same direction as the axial direction of the electrode lead-out hole 1121 to facilitate assembly of the battery cell 100. The first direction Y intersects the thickness direction X. For example, the first direction Y is perpendicular to the thickness direction X.

[0073] It can be understood that when the wall portion 11 is provided on the end cover 101, the thickness direction X can be the height direction of the battery cell 100, and when the battery cell 100 is a rectangular parallelepiped structure, the first direction Y can be expressed as the length direction of the battery cell 100; when the battery cell 100 is a cube structure, the first direction Y can be expressed as the length direction or width direction of the battery cell 100; when the battery cell 100 is a cylindrical structure, the first direction Y can be expressed as the radial direction of the battery cell 100.

[0074] Illustratively, the electrode lead-out hole 1121 passes through the wall portion 11 so that the electrode terminal 30 can lead the electrical energy of the electrode assembly 20 to the outside of the housing 10. Optionally, the electrode lead-out hole 1121 passes through the wall portion 11 along the thickness direction X.

[0075] Optionally, the main body portion 111 is disposed around the connecting portion 112 .

[0076] Exemplarily, the number of electrode lead holes 1121 is set to two, each electrode lead hole 1121 is provided with an electrode terminal 30, the connecting portion 112 has the electrode lead hole 1121, and the outer peripheral surface of the connecting portion 112 facing away from the electrode lead hole 1121 is connected to the main body 111.

[0077] The outer circumference of the electrode terminal 30 along the first direction Y is recessed to form a recess 301. In other words, a portion of the electrode terminal 30 is separated by the recess 301 along the thickness direction X. As an example, the recess 301 can be configured as an annular structure and disposed on the outer circumference of the electrode terminal 30, with the connecting portion 112 extending into the recess 301. This allows the portion of the electrode terminal 30 separated by the recess 301 along the thickness direction X to function as a position limiter, preventing risks such as displacement of the electrode terminal 30.

[0078] Optionally, the connecting portion 112 may be entirely extended into the recess 301 . Of course, the connecting portion 112 may also partially extend into the recess 301 .

[0079] Some embodiments of the present application provide a battery cell 100, which includes a shell 10, an electrode assembly 20 and an electrode terminal 30. The outer peripheral surface of the electrode terminal 30 is provided with a recess 301, and the connecting portion 112 can extend into the recess 301 of the electrode terminal 30 and seal with the electrode terminal 30. By setting it in this way, it is possible to improve the sealing between the connecting portion 112 and the electrode terminal 30, and also help to increase the connection area between the connecting portion 112 and the electrode terminal 30 to improve the connection strength between the two. In addition, the design of the connecting portion extending into the recess to seal with the electrode terminal can also limit the electrode terminal to prevent it from displacement, thereby helping to improve the reliability of the battery cell 100.

[0080] In some embodiments, the shell 102 includes a side wall and an end wall. The side wall surrounds the outside of the electrode assembly 20, and the end wall is arranged opposite to the opening. The wall portion 11 is the end cover 101 or the end wall. By arranging the electrode terminal 30 on the end cover 101 or the end wall, the assembly efficiency of the battery cell 100 can be improved.

[0081] In some embodiments, the housing 102 is an integrally formed structure, and the wall portion 11 is an end cover 101 .

[0082] There may be one or more sidewalls. In some examples, there may be one sidewall and it may be a cylindrical structure. In other examples, there may be multiple sidewalls that are sequentially connected along the circumference of the electrode assembly 20; for example, there may be four sidewalls that are sequentially connected to form a square cylindrical structure.

[0083] In some optional embodiments, along the thickness direction X of the wall portion 11 , a ratio of a thickness dimension d1 of the connecting portion 112 to a thickness dimension d2 of the main body portion 111 satisfies: 0.2≤d1 / d2≤1.2.

[0084] The thickness dimension d1 of the connecting portion 112 refers to the distance from one end to the other end of the connecting portion 112 in the thickness direction X, and the thickness dimension d2 of the main body 111 refers to the distance from one end to the other end of the main body 111 in the thickness direction X.

[0085] As an example, the ratio of the thickness dimension d1 of the connecting portion 112 to the thickness dimension d2 of the main body portion 111 can be, but is not limited to, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, etc.

[0086] It is understandable that the thickness of the connecting portion 112 and the main body 111 will affect the overall structural performance of the wall portion 11. If the ratio d1 / d2 of the thickness dimension d1 of the connecting portion 112 to the thickness dimension d2 of the main body 111 is designed to be too small, that is, d1 / d2 is less than 0.2, then the thickness dimension d1 of the connecting portion 112 and the thickness dimension d2 of the main body 111 may both be designed to be too small, and the thickness dimension d1 may be designed to be smaller than the thickness dimension d2. This may easily lead to insufficient connection strength between the connecting portion 112 and the main body 111, thereby reducing the overall structural strength of the wall portion 11. In addition, it may also cause the gap between the connecting portion 112 and the electrode terminal 10 to be too large, which is not conducive to sealing and has a poor sealing effect. Alternatively, the thickness dimension d1 of the connecting portion 112 and the thickness dimension d2 of the main body 111 may both be designed to be too large, and the thickness dimension d1 may be designed to be larger than the thickness dimension d2, resulting in an excessively large overall area occupied by the wall portion 11, thereby affecting the energy density of the battery 1000.

[0087] Therefore, setting the ratio d1 / d2 of the thickness dimension d1 of the connecting portion 112 to the thickness dimension d2 of the main body portion 111 within the above range can improve the sealing between the connecting portion 112 and the electrode terminal 30 and the structural strength of the wall portion 11, thereby helping to better improve the reliability of the battery cell 100.

[0088] The battery cell 100 provided in some embodiments of the present application can improve the sealing between the connecting portion 112 and the electrode terminal 30 and the structural strength of the wall portion 11 by setting the ratio d1 / d2 of the thickness dimension d1 of the connecting portion 112 to the thickness dimension d2 of the main body portion 111 between 0.2 and 1.2, including two endpoint values of 0.2 and 1.2, thereby helping to improve the reliability of the battery cell 100.

[0089] The material of the electrode terminal 30 may be the same as or different from that of the wall portion 11. As an example, the electrode terminal 30 and the wall portion 11 may be made of different materials, and the melting point of the electrode terminal 30 and the melting point of the wall portion 11 may be the same as or different from that of the wall portion 11.

[0090] Please continue reading Figure 6 In some embodiments, along the thickness direction X of the wall portion 11 , a ratio of a thickness dimension d1 of the connecting portion 112 to a thickness dimension d2 of the main body portion 111 satisfies: 0.5≤d1 / d2≤0.7.

[0091] As an example, the ratio d1 / d2 of the thickness dimension d1 of the connection portion 112 to the thickness dimension d2 of the main body portion 111 may be, but is not limited to, 0.5, 0.55, 0.6, 0.65, 0.7, etc.

[0092] By further setting the ratio d1 / d2 of the thickness dimension d1 of the connecting portion 112 to the thickness dimension d2 of the main body portion 111 between 0.5 and 0.7, and including the two endpoint values of 0.5 and 0.7, the sealing between the connecting portion 112 and the electrode terminal 30 and the structural strength of the wall portion 11 can be better improved, thereby helping to better improve the reliability of the battery cell 100. In addition, it is also convenient to manufacture the wall portion 11.

[0093] Furthermore, the ratio d1 / d2 of the thickness dimension d1 of the connection portion 112 to the thickness dimension d2 of the main body portion 111 satisfies: 0.55≤d1 / d2≤0.65, which can further improve the sealing between the connection portion 112 and the electrode terminal 30 and the structural strength of the wall portion 11.

[0094] In some embodiments, at least one side surface of the connecting portion 112 along the thickness direction X has a gap with any side surface of the main body portion 111 along the thickness direction X of the wall portion 11 .

[0095] It can be understood that the positive projection of the main body 111 in the first direction Y protrudes from the circumferential side of the positive projection of the connecting portion 112 in the first direction Y, that is, the side surface of the connecting portion 112 along the thickness direction X and the side surface of the main body 111 along the thickness direction X are arranged in a step structure.

[0096] When the electrode terminal 30 is welded to other structures, the electrode terminal 30 will transfer part of the force to the connecting part 112. By setting it in this way, the main body 111 can provide uniform support to the connecting part 112 to prevent the connecting part 112 from deforming, and it is beneficial to improve the connection strength between the connecting part 112 and the main body 111.

[0097] Optionally, an extension line of a midpoint of the connecting portion 112 along the thickness direction X in the first direction Y overlaps with an extension line of a midpoint of the main body portion 111 along the thickness direction X in the first direction Y.

[0098] like Figure 6 As shown, in some embodiments, the ratio of the length dimension L of the connecting portion 112 along the first direction Y to the thickness dimension d1 of the connecting portion 112 along the thickness direction X of the wall portion 11 satisfies: 10≤L / d1≤1, and the first direction Y intersects the thickness direction X.

[0099] As an example, the ratio L / d1 of the length dimension L to the thickness dimension d1 of the connection portion 112 may be, but is not limited to, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, and the like.

[0100] It is understandable that if the ratio L / d1 of the length dimension L of the connecting portion 112 to the thickness dimension d1 is designed to be too large, that is, L / d1>10, the length dimension L of the connecting portion 112 may be set too long relative to its thickness dimension d1, resulting in the area of the area that needs to be sealed between the electrode terminal 30 and the connecting portion 112 being too large, resulting in increased sealing difficulty and a risk of leakage; or, the thickness dimension d1 of the connecting portion 112 may be set too thin relative to its length dimension L, resulting in a reduction in the structural strength of the connecting portion 112, resulting in a reduction in the connection strength between the wall portion 11 and the electrode terminal 30, and a risk of separation between the wall portion 11 and the electrode terminal 30.

[0101] If the ratio L / d1 of the length dimension L of the connecting portion 112 to the thickness dimension d1 is designed to be too small, that is, L / d1 < 1, the length dimension L of the connecting portion 112 may be set too short relative to its thickness dimension d1, causing the connecting portion 112 to be too far away from the electrode terminal 30 in the first direction Y, which will also increase the difficulty of sealing and easily cause the risk of leakage; or, the thickness dimension d1 of the connecting portion 112 may be set too thick relative to its length dimension L, causing the occupied area of the wall portion 11 to increase, which may easily affect the energy density of the battery 1000.

[0102] Therefore, the battery cell 100 provided in some embodiments of the present application, by setting the ratio L / d1 of the length dimension L of the connecting portion 112 to the thickness dimension d1 between 10 and 1, and including the two endpoint values of 10 and 1, enables the battery cell 100 to take into account both the sealing and structural strength requirements, thereby improving the reliability of the battery cell 100.

[0103] In some embodiments, a ratio of a length dimension L of the connecting portion 112 to a thickness dimension d1 of the connecting portion 112 satisfies: 6≤L / d1≤1.

[0104] As an example, the ratio L / d1 of the length dimension L of the connection portion 112 to the thickness dimension d1 may be, but is not limited to, 6, 5, 4, 3, 2, 1, and the like.

[0105] By further setting the ratio L / d1 of the length dimension L of the connecting portion 112 to the thickness dimension d1 between 6 and 1, and including the two endpoint values of 6 and 1, the sealing between the connecting portion 112 and the electrode terminal 30 and the structural strength of the wall portion 11 can be better improved, thereby helping to better improve the reliability of the battery cell 100.

[0106] Furthermore, the ratio of the length dimension L of the connection portion 112 to the thickness dimension d1 of the connection portion 112 satisfies: 5≤L / d1≤2, which can further optimize the balance between the sealing between the connection portion 112 and the electrode terminal 30 and the structural strength of the wall portion 11 .

[0107] As an example, the ratio of the length dimension L of the connection portion 112 to the thickness dimension d1 satisfies: 3.5≤d1 / d2≤2.

[0108] See also Figure 7 In some embodiments, an angle α is formed at the connection between the connecting portion 112 and the main body portion 111 , and the angle α satisfies: 60°≤α≤160°.

[0109] As an example, the angle α may be, but is not limited to, 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, etc.

[0110] It is understandable that if the angle α is set too small, that is, α < 60°, the main body 111 and the electrode terminal 30 may interfere with each other, and the manufacturing difficulty may be increased; if the angle α is set too small, that is, α > 120°, the manufacturing difficulty may be increased, and when the electrode terminal 30 is welded to other components, the force transmitted from the electrode terminal 30 to the connecting portion 112 cannot be effectively shared by the main body 111, which may easily cause the connecting portion 112 to deform or even fail.

[0111] Therefore, by setting the angle α at the connection between the connecting portion 112 and the main body portion 111 between 60° and 160°, including the two endpoint values of 60° and 160°, it is beneficial to reduce the impact effect of the electrode terminal 30 on the wall portion 11 after welding with other components, thereby helping to improve the structural strength of the wall portion 11, and further helping to improve the reliability of the battery cell 100.

[0112] In some examples, the connecting portion 112 and the main body 111 have an included angle α. In some examples, the connection between the connecting portion 112 and the main body 111 is rounded, and the central angle corresponding to the arc of the rounded corner satisfies: 60°≤α≤160°.

[0113] In some embodiments, the angle α satisfies: 100°≤α≤120°.

[0114] As an example, the angle α may be, but is not limited to, 100°, 105°, 100°, 1 / 1°, 120°, etc.

[0115] By further setting the angle α at the connection between the connecting portion 112 and the main body portion 111 between 100° and 1260°, and including two endpoint values of 100° and 120°, the impact of the electrode terminal 30 on the wall portion 11 after welding can be better reduced, thereby better improving the structural strength of the wall portion 11.

[0116] Furthermore, the angle α satisfies: 110°≤α≤120°.

[0117] See also Figures 5 to 7 In some embodiments, the electrode terminal 30 includes a main body 31, a first end 32 and a second end 33. The first end 32 and the second end 33 are arranged opposite to each other on both sides of the main body 31 along the thickness direction X of the wall portion 11. The main body 31 is inserted into the electrode lead-out hole 1121, and the second end 33 is arranged toward the electrode assembly 20. The main body 31, the first end 32 and the second end 33 are enclosed to form a recess 301. Along the thickness direction X, the ratio of the thickness dimension d3 of the second end 33 to the thickness dimension d1 of the connecting portion 112 satisfies: 1≤d3 / d1≤10.

[0118] At least a portion of the main body 31 is accommodated in the electrode lead-out hole 1121 , and in the thickness direction X, at least a portion of the wall portion 11 is located between the first end portion 32 and the second end portion 33 .

[0119] The wall portion 11 may be confined between the first end portion 32 and the second end portion 33 to limit relative movement between the electrode terminal 30 and the wall portion 11 .

[0120] By setting the main body 31 to extend into the electrode lead-out hole 1121, it is easy to connect the electrode terminal 30 to other components outside the battery cell 100. The wall portion 11 blocks the first end 32 and the second end 33, thereby preventing the electrode terminal 30 from being separated from the interior of the housing 10.

[0121] As an example, the ratio d3 / d1 of the thickness d3 of the second end portion 33 to the thickness d1 of the connecting portion 112 may be, but is not limited to, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, etc.

[0122] It is understandable that if the ratio d3 / d1 of the thickness dimension d3 of the second end portion 33 to the thickness dimension d1 of the connecting portion 112 is designed to be too large, that is, d3 / d1>10, the thickness dimension d3 of the second end portion 33 may be set too thick relative to the thickness dimension d1 of the connecting portion 112, so that the second end portion 33 will occupy more internal space of the outer shell 10, while reducing the setting space of the electrode assembly 20, which may easily affect the energy density of the battery 1000. Alternatively, the thickness dimension d1 of the connecting portion 112 may be set too thin relative to the thickness dimension d3 of the second end portion 33, resulting in a reduction in the structural strength of the connecting portion 112, resulting in a reduction in the connection strength between the wall portion 11 and the electrode terminal 30, and easily creating the risk of separation of the wall portion 11 and the electrode terminal 30.

[0123] If the ratio d3 / d1 of the thickness dimension d3 of the second end portion 33 to the thickness dimension d1 of the connecting portion 112 is designed to be too small, that is, d3 / d1 < 1, the thickness dimension d3 of the second end portion 33 may be set too thin relative to the thickness dimension d1 of the connecting portion 112, which may cause the risk of fracture failure when the second end portion 33 is welded with other components. Alternatively, the thickness dimension d1 of the connecting portion 112 may be set too thick relative to the thickness dimension d3 of the second end portion 33, which may also easily lead to a reduction in the connection strength between the wall portion 11 and the electrode terminal 30.

[0124] Therefore, the battery cell 100 provided in some embodiments of the present application, by setting the ratio d3 / d1 of the thickness dimension d3 of the second end portion 33 to the thickness dimension d1 of the connecting portion 112 between 1 and 10, and including the two endpoint values of 1 and 10, enables the battery cell 100 to take into account both energy density and structural strength requirements, thereby improving the energy density and reliability of the battery cell 100.

[0125] The first end portion 32 may be one or more. Optionally, the first end portion 32 is one and is a circular ring structure, and the main body 31 is connected to the inner circumference of the first end portion 32 .

[0126] There may be one or more second end portions 33 . Optionally, there may be multiple second end portions 33 , which are connected to the outer circumferential surface of the main body 31 and spaced apart along the circumference of the main body 31 .

[0127] Optionally, in the thickness direction X, the orthographic projection of the first end 32 protrudes from the circumferential side of the orthographic projection of the second end 33, that is, the orthographic projection area of the first end 32 on the connecting portion 112 is larger than the orthographic projection area of the second end 33 on the connecting portion 112, that is, in the first direction Y, the first end 32 has a larger size relative to the second end 33, which can increase the exposed area of the electrode terminal 30, facilitate the connection of the electrode terminal 30 with the external busbar component, increase the connection area between the electrode terminal 30 and the busbar component, and improve the current flow capacity.

[0128] Optionally, in the thickness direction X, the orthographic projection area of the first end portion 32 on the connecting portion 112 is equal to the orthographic projection area of the second end portion 33 on the connecting portion 112 .

[0129] In some embodiments, the first end portion 32 , the second end portion 33 and the main body 31 are integrally formed.

[0130] Furthermore, the ratio of the thickness dimension d3 of the second end portion 33 to the thickness dimension d1 of the connecting portion 112 satisfies: 2≤d3 / d1≤7.

[0131] Furthermore, the ratio of the thickness dimension d3 of the second end portion 33 to the thickness dimension d1 of the connecting portion 112 satisfies: 2≤d3 / d1≤5.

[0132] In some embodiments, a ratio of the thickness d3 of the second end portion 33 to the thickness d1 of the connecting portion 112 satisfies: 2≤d3 / d1≤3.

[0133] As an example, the ratio d3 / d1 of the thickness dimension d3 of the second end portion 33 to the thickness dimension d1 of the connecting portion 112 may be, but is not limited to, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 23, etc.

[0134] By further setting the ratio of the thickness dimension d3 of the second end portion 33 to the thickness dimension d1 of the connecting portion 112 to be between 2 and 3, including the two endpoint values of 2 and 3, the energy density and reliability of the battery cell 100 can be further improved.

[0135] like Figure 4 and Figure 5 As shown, in some embodiments, the electrode terminal 30 is recessed along the thickness direction X of the wall portion 11 toward one side of the electrode assembly 20 to form a groove 302 , and the groove 302 is spaced apart from the recess 301 .

[0136] The groove 302 is used to accommodate part of the adapter 50. For example, the adapter 50 has a protrusion on the side facing the electrode terminal 30. The protrusion can extend into the groove 302 to connect with the adapter 50 to realize the electrical connection setting between the adapter 50 and the electrode terminal 30.

[0137] This arrangement facilitates electrical connection between the electrode terminal 30 and the adapter 50 inside the housing 102 , and also helps to increase the energy density of the battery cell 100 .

[0138] In some embodiments, the second end portion 33 is formed by folding a portion of the electrode terminal 30. During assembly, the electrode terminal 30 can be inserted into the interior of the housing 10 through the electrode lead-out hole 1121. Then, a portion of the electrode terminal 30 is folded to form the second end portion 33, thereby securing the electrode terminal 30 to the wall portion 11. The second end portions 33 enclose a groove 302.

[0139] In some embodiments, when the electrode terminal 30 extends from the outside through the electrode lead-out hole 1121 into the interior of the housing 10 , one side of the electrode terminal 30 can be squeezed from the inside to bend a portion of the electrode terminal 30 and form a flange-shaped second end 33 .

[0140] like Figure 5 As shown, in some embodiments, the battery cell 100 further includes a seal 40 , at least a portion of the seal 40 is disposed in the recess 301 , and the seal 40 is sleeved on the electrode terminal 30 and sealedly connected to the connecting portion 112 and the electrode terminal 30 .

[0141] The sealing member 40 is used to achieve insulation and sealing connection between the connecting portion 112 and the electrode terminal 30 .

[0142] The seal 40 is sleeved on the outer periphery of the electrode terminal 30 and is in contact with the connecting portion 112 and the electrode terminal 30 to seal the gap between the connecting portion 112 and the electrode terminal 30 along the first direction Y, thereby preventing the wall portion 11 or the electrode terminal 30 from short-circuiting due to metal debris.

[0143] The sealing member 40 may fill the gap between the electrode terminal 30 and the wall portion 11 to seal the electrode lead-out hole 1121 .

[0144] In some embodiments, the portion of the sealant 40 sandwiched between the electrode terminal 30 and the wall portion 11 is compressed to seal the electrode lead-out hole 1121 .

[0145] In some embodiments, a portion of the seal 40 is disposed between the first end portion 32 and the connecting portion 112 .

[0146] In some embodiments, a portion of the seal 40 is disposed between the second end portion 33 and the connecting portion 112 .

[0147] In some embodiments, a portion of the sealing member 40 is disposed in the electrode lead-out hole 1121 and separates the hole wall of the electrode lead-out hole 1121 from the main body 31 .

[0148] In some embodiments, the sealant 40 is made of an insulating material and can insulate the wall portion 11 from the electrode terminal 30 .

[0149] In some embodiments, the battery cell 100 further includes an insulating component, which is disposed on a surface of the wall portion 1123 facing the electrode assembly 20. The insulating component can be used to insulate at least a portion of the electrode assembly 20 from the wall portion 11.

[0150] The battery cell 100 provided in some embodiments of the present application is provided with a sealing member 40 to facilitate ensuring a sealed fit between the connecting portion 112 and the electrode terminal 30 .

[0151] In some embodiments, the housing 10 includes a shell 102 and an end cover 101 . The shell 102 has an opening. The end cover 101 covers the opening. The end cover 101 includes a wall portion 11 .

[0152] The housing 102 is a component that cooperates with the end cap 101 to form the internal cavity of the battery cell 100. The formed internal cavity can be used to accommodate the electrode assembly 20, electrolyte, and other components. The housing 102 and the end cap 101 can be separate components. For example, an opening can be provided in the housing 102, and the end cap 101 can be placed over the opening to form the internal cavity of the battery cell 100.

[0153] The housing 102 can have various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 102 can be determined based on the specific shape and size of the electrode assembly 20. The housing 102 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and this embodiment of the present application does not impose any particular limitation on this.

[0154] The shape of the end cap 101 can be adapted to the shape of the housing 102 to fit the housing 102. The material of the end cap 101 can be the same as or different from the material of the housing 102. Optionally, the end cap 101 can be made of a material with a certain hardness and strength (e.g., copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.). In this way, the end cap 101 is less likely to deform when squeezed or collided, thereby providing the battery cell 100 with higher structural strength and improved reliability.

[0155] The end cover 101 is connected to the housing 102 by welding, bonding, clamping or other methods.

[0156] The housing 102 may be open at one end or at both ends. In some examples, the housing 102 may be open at one end, with one end cap 101 provided and covering the housing 102. In other examples, the housing 102 may be open at both ends, with two end caps 101 provided, each covering the two openings of the housing 102.

[0157] The battery cell 100 provided in some embodiments of the present application is easy to assemble and helps to improve assembly efficiency by disposing the wall portion 11 on the end cover 101.

[0158] According to some embodiments of the present application, the present application further provides a battery 1000 , comprising the battery cell 100 provided in any of the above embodiments.

[0159] According to some embodiments of the present application, the present application provides an electrical device, including the battery 1000 provided in any of the above embodiments, and the battery is used to provide electrical energy.

[0160] See also Figure 2 、 Figures 4 to 7 An embodiment of the present application provides a battery cell 100 , including a housing 10 , an electrode assembly 20 , an electrode terminal 30 , and a seal 40 .

[0161] The housing 10 includes a shell 102 and an end cap 101. The shell 102 has an opening, and the end cap 101 covers the opening. The end cap 101 includes a wall portion 11. The wall portion 11 includes a main body 111 and a connecting portion 112. The connecting portion 112 has an electrode lead-out hole 1121. The main body 111 is connected to the connecting portion 112. At least one side surface of the connecting portion 112 along the thickness direction X is spaced from any side surface of the main body 111 along the thickness direction X. The electrode assembly 20 is accommodated in the housing 10.

[0162] The electrode terminal 30 is arranged in the electrode lead-out hole 1121 and is electrically connected to the electrode assembly 20. The outer peripheral surface of the electrode terminal 30 is recessed to form a recess 301. The electrode terminal 30 includes a main body 31, a first end 32 and a second end 33. The first end 32 and the second end 33 are relatively arranged on both sides of the main body 31 along the thickness direction X. The main body 31 is inserted into the electrode lead-out hole 1121, and the second end 33 is arranged toward the electrode assembly 20. The electrode terminal 30 is recessed along the thickness direction X toward one side of the electrode assembly 20 to form a groove 302, and the groove 302 is spaced apart from the recess 301.

[0163] The sealing member 40 is disposed in the recess 301 . The sealing member 40 is sleeved on the connecting portion 112 and is sealed and connected to the connecting portion 112 and the electrode terminal 30 .

[0164] The connecting portion 112 extends into the recess 301 and is sealed with the electrode terminal 30. Along the thickness direction X, the ratio of the thickness dimension d1 of the connecting portion 112 to the thickness dimension d2 of the main body 111 satisfies: 0.5≤d1 / d2≤0.7; the ratio of the length dimension L of the connecting portion 112 along the first direction Y to the thickness dimension d1 of the connecting portion 112 along the axial direction satisfies: 6≤L / d1≤1; the connection between the connecting portion 112 and the main body 111 forms an angle α, and the angle α satisfies: 100°≤α≤120°; the ratio of the thickness dimension d3 of the second end portion 33 to the thickness dimension d1 of the connecting portion 112 satisfies: 2≤d3 / d1≤3.

[0165] For example, a reliability test can be performed on the battery cell 100 under a test environment, where the test conditions include the electrode terminal 30 being sealed with the wall portion 11, applying a force of 0-1200N to the electrode terminal 30 along the thickness direction X, applying a force of 0-1000N to the electrode terminal 30 along the first direction Y, and applying a force of 0-1000N to the electrode terminal 30 along a second direction intersecting the thickness direction X and the first direction Y; and filling the housing 10 with helium. The thickness direction X can be the height direction of the battery cell 100, the first direction Y can be the length direction of the battery cell 100, and the second direction can be the width direction of the battery cell 100. The test results are shown in the following table:

[0166]

[0167] As can be seen from the above table, along the thickness direction X, when the ratio d1 / d2 of the thickness dimension d1 of the connecting portion 112 to the thickness dimension d2 of the main body 111 is equal to 0.6, the ratio L of the length dimension L of the connecting portion 112 along the first direction Y to the thickness dimension d1 of the connecting portion 112 along the axial direction is equal to 6, the angle α between the connecting portion 112 and the main body 111 is equal to 100°, and the ratio d3 / d1 of the thickness dimension d3 of the second end portion 33 to the thickness dimension d1 of the connecting portion 112 is equal to 2, the force applied to each meter of the wall portion 11 is 11 N / m, and the gas leakage rate in the housing 10 is 1x10- 8 pa·m 3 / s, under this structure, the wall portion 11 has good structural strength, and the electrode terminal 30 and the wall portion 11 have good sealing performance, which is beneficial to improving the reliability of the battery cell 100.

[0168] Of course, it is understandable that the above are only some examples and this article is not limited to this.

[0169] 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.

[0170] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: The housing includes a wall portion, the wall portion includes a main body portion and a connecting portion, the connecting portion has an electrode lead-out hole, and the main body portion is connected to the connecting portion; an electrode assembly housed in the housing; an electrode terminal, disposed in the electrode lead-out hole and electrically connected to the electrode assembly, wherein the outer peripheral surface of the electrode terminal is recessed to form a concave portion; Wherein, the connecting portion extends into the recess and is sealed with the electrode terminal.

2. The battery cell according to claim 1, wherein: Along the thickness direction of the wall portion, a ratio of a thickness dimension d1 of the connecting portion to a thickness dimension d2 of the main body portion satisfies: 0.2≤d1 / d2≤1.

2.

3. The battery cell according to claim 1, wherein: Along the thickness direction of the wall portion, a ratio of a thickness dimension d1 of the connecting portion to a thickness dimension d2 of the main body portion satisfies: 0.5≤d1 / d2≤0.

7.

4. The battery cell according to any one of claims 1 to 3, characterized in that: At least one side surface of the connecting portion along the thickness direction of the wall portion has a gap with any one side surface of the main body portion along the thickness direction.

5. The battery cell according to any one of claims 1 to 4, characterized in that: A ratio of a length L of the connecting portion along a first direction to a thickness d1 of the connecting portion along a thickness direction of the wall portion satisfies: 10≤L / d1≤1, and the first direction intersects the thickness direction.

6. The battery cell according to claim 5, characterized in that The ratio of the length dimension L of the connecting portion to the thickness dimension d1 of the connecting portion satisfies: 6≤L / d1≤1.

7. The battery cell according to any one of claims 1 to 6, characterized in that: An included angle α is formed at a connection between the connecting portion and the main body, and the included angle α satisfies: 60°≤α≤160°.

8. The battery cell according to claim 7, characterized in that The angle α satisfies: 100°≤α≤120°.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The electrode terminal includes a main body, a first end and a second end, the first end and the second end are arranged opposite to each other on both sides of the main body along the thickness direction of the wall portion, the main body is inserted into the electrode lead-out hole, and the second end is arranged toward the electrode assembly. The main body, the first end and the second end are combined to form the recess, and along the thickness direction, the ratio of the thickness dimension d3 of the second end to the thickness dimension d1 of the connecting portion satisfies: 1≤d3 / d1≤10.

10. The battery cell according to claim 9, characterized in that: A ratio of a thickness dimension d3 of the second end portion to a thickness dimension d1 of the connecting portion satisfies: 2≤d3 / d1≤3.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The electrode terminal is recessed toward one side of the electrode assembly along a thickness direction of the wall portion to form a groove, and the groove is spaced apart from the recess.

12. The battery cell according to any one of claims 1 to 11, characterized in that: The battery cell further includes a sealing member, at least a portion of which is disposed in the recessed portion. The sealing member is sleeved on the electrode terminal and is sealed and connected to the connecting portion and the electrode terminal.

13. The battery cell according to any one of claims 1 to 12, characterized in that: The housing includes a shell and an end cover. The shell has an opening. The end cover covers the opening. The end cover includes the wall portion.

14. A battery, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 13.

15. An electrical device, characterized in that: The battery according to claim 14 is included for providing electrical energy.

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