Battery cells, batteries and electrical equipment

Abstract

The embodiment of the present application provides a battery cell, a battery and an electrical device, belonging to the field of battery technology. The battery cell includes: an electrode assembly, an electrode terminal and a connecting component, the connecting component includes: a body, a convex portion, a concave portion and a gap control portion, the body includes a first surface and a second surface opposite to each other along its thickness direction, the body is connected to the electrode assembly, the convex portion is connected to the body and protrudes from the first surface, the convex portion is connected to the electrode terminal, the concave portion is provided on the second surface and corresponds to the position of the convex portion, and the gap control portion is configured to contact the other connecting component when the connecting component is stacked with the other connecting component to control the gap D between the two connecting components to be greater than 0.6H, where H is the height of the convex portion protruding from the first surface. According to the connecting component provided by the present application, the gap between two adjacent connecting components can be controlled when stacked, reducing the risk of material jamming and improving production efficiency.

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] The connecting component is one of the important components of the battery, which is used to connect the electrode terminal and the electrode assembly of the battery cell to conduct the electrical energy of the electrode assembly through the electrode terminal.

[0003] During the battery production process, multiple connecting components are usually stacked in a fixture. Adjacent connecting components are prone to stacking and jamming, causing the robot arm to pick up two or more connecting components at a time when picking up materials from the fixture, thus affecting battery production efficiency. Summary of the invention

[0004] The purpose of the present application is to provide a connecting component, wherein the gap between two adjacent connecting components can be controlled when stacked, thereby reducing the risk of material jamming and improving production efficiency.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, the present application provides a connecting component for connecting an electrode assembly and an electrode terminal, comprising:

[0007] A body including a first surface and a second surface opposite to each other along a thickness direction thereof;

[0008] a convex portion connected to the body and protruding from the first surface;

[0009] A concave portion, disposed on the second surface and corresponding to the position of the convex portion;

[0010] The gap control part is configured to contact the other connecting part when the connecting part to which it belongs is stacked with the other connecting part, so as to control the gap D between the two connecting parts to be greater than 0.6H, where H is the height of the protrusion protruding from the first surface.

[0011] According to the connecting components of the embodiments of the present application, when two connecting components are stacked, the convex portion of one connecting component corresponds to the concave portion of the other connecting component. Since the connecting components are provided with a gap control portion, the gap control portion of the connecting component is in contact with the other connecting component. The gap D between the two connecting components is controlled to be greater than 0.6H by the gap control portion, so that most of the area of ​​the convex portion of the connecting component is located outside the concave portion of the other connecting component, thereby reducing the overlapping area of ​​the two connecting components, effectively reducing the risk of material jamming of the two stacked connecting components, facilitating material removal during the production process, and improving production efficiency.

[0012] In some embodiments of the present application, the convex portion includes an end wall and a side wall, the side wall is arranged around the end wall, the side wall is connected to the body, and the end wall and the side wall form a recessed portion.

[0013] In some embodiments of the present application, the angle between the side wall and the end wall is greater than 90°.

[0014] In the above solution, by setting the included angle between the side wall and the end wall to be an obtuse angle, processing and manufacturing (for example, demoulding) are facilitated.

[0015] In some embodiments of the present application, the gap control portion includes a first protrusion, which is disposed at a connection between the protrusion and the body and is exposed to the second surface.

[0016] In the above scheme, by setting the first protrusion at the connection between the protrusion and the main body and exposing it to the second surface, the structure is simple, and the connecting component to which the protrusion belongs is restricted from entering the recess of another connecting component, thereby reducing the overlapping area of ​​the two connecting components, and the gap control effect is good, reducing or avoiding the risk of material jamming between the two connecting components.

[0017] In some embodiments of the present application, the first protrusion is an annular protrusion extending along the circumference of the convex portion; or, there are multiple first protrusions, and the multiple first protrusions are arranged at intervals along the circumference of the convex portion.

[0018] In the above scheme, when the first protrusion is an annular protrusion, when the corresponding connecting component is stacked with another connecting component, the first protrusion has a larger contact area with the other connecting component, the stacking support of the two connecting components is stable, and the depth of the protrusion of the corresponding connecting component entering the recessed portion of the other connecting component is effectively controlled, thereby reducing the risk of the two connecting components being stuck; when the number of the first protrusion is multiple, when the corresponding connecting component is stacked with another connecting component, on the circumference of the protrusion, the multiple first protrusions can increase the contact positions of the two connecting components, forming multiple positions for stacking support, ensuring that the stacking support of the two connecting components is stable, effectively controlling the depth of the protrusion of the corresponding connecting component entering the recessed portion of the other connecting component, thereby reducing the risk of the two connecting components being stuck.

[0019] In some embodiments of the present application, the gap control portion includes a groove, which is provided on the outer surface of the convex portion and located at the connection between the end wall and the side wall, and the groove is an annular groove arranged around the end wall.

[0020] In the above scheme, when two connecting components are stacked, the body of one connecting component cooperates with the groove of the other connecting component, and the step formed by the groove limits the gap between the two connecting components, which can effectively control the gap between the two adjacent stacked connecting components.

[0021] In some embodiments of the present application, the gap control portion includes a second protrusion, which is disposed on the body and protrudes from the first surface and / or the second surface.

[0022] In the above solution, by arranging the second protrusion on the body, when the connecting component to which the second protrusion belongs is stacked with another connecting component, the connecting component abuts against the other connecting component, thereby effectively controlling the gap between the two connecting components.

[0023] In some embodiments of the present application, the second protrusion protrudes from the first surface and is inclined toward the convex portion; or, the second protrusion protrudes from the second surface and is inclined toward the concave portion.

[0024] In the above solution, by arranging the second protrusion at an angle, the gap between two adjacent stacked connecting components can be effectively controlled, thereby reducing the risk of material jamming.

[0025] In some embodiments of the present application, there are multiple second protrusions, and the multiple second protrusions are distributed around the recess at intervals.

[0026] In the above solution, by providing a plurality of second protrusions, the two connecting components can be in contact at multiple positions, thereby ensuring stable support and improving the effect of controlling the gap between two adjacent stacked connecting components.

[0027] In some embodiments of the present application, the protrusion is located on the width center line of the connecting component, and the plurality of second protrusions are symmetrically distributed about the width center line.

[0028] In the above solution, since the plurality of second protrusions are symmetrically distributed, when the corresponding connecting component is stacked with another connecting component, the stacked support of the two connecting components can be ensured to be stable, thereby facilitating the control of the gap between the two connecting components.

[0029] In some embodiments of the present application, at least one second protrusion is disposed on an edge of the body.

[0030] In the above solution, the second protrusion is arranged on the edge of the main body to facilitate processing and manufacturing.

[0031] In a second aspect, the present application further provides a battery cell, comprising:

[0032] Electrode assembly;

[0033] Electrode terminal;

[0034] As in the above-mentioned connecting component, the main body is connected to the electrode assembly, and the protrusion is connected to the electrode terminal.

[0035] In a third aspect, the present application also provides a battery, comprising the battery cell as described above.

[0036] In a fourth aspect, the present application also provides an electrical device, including the battery as described above.

[0037] In a fifth aspect, the present application also provides a method for manufacturing a battery cell, the method comprising: providing an electrode assembly; providing an electrode terminal; providing a connecting component, the connecting component comprising a main body, a convex portion, a concave portion and a gap control portion, the main body comprising a first surface and a second surface opposite to each other along a thickness direction thereof, the convex portion being connected to the main body and protruding from the first surface, the concave portion being arranged on the second surface and corresponding to the position of the convex portion, the gap control portion being configured to contact the other connecting component when the connecting component to which it belongs is stacked with the other connecting component so as to control the gap D between the two connecting components to be greater than 0.6H, where H is the height of the convex portion protruding from the first surface; connecting the main body to the electrode assembly, and connecting the convex portion to the electrode terminal.

[0038] In the sixth aspect, the present application also provides a manufacturing device for a battery cell, the device comprising: a first providing module for providing an electrode assembly; a second providing module for providing an electrode terminal; a third providing module for providing a connecting component, the connecting component comprising a main body, a convex portion, a concave portion and a gap control portion, the main body comprising a first surface and a second surface opposite to each other along its thickness direction, the convex portion being connected to the main body and protruding from the first surface, the concave portion being arranged on the second surface and corresponding to the position of the convex portion, the gap control portion being configured to contact the other connecting component when the connecting component to which it belongs is stacked with the other connecting component so as to control the gap D between the two connecting components to be greater than 0.6H, where H is the height of the convex portion protruding from the first surface; an installing module for connecting the main body to the electrode assembly, and for connecting the convex portion to the electrode terminal.

[0039] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0041] Figure 1 A schematic diagram of the structure of a vehicle provided in one embodiment of the present application;

[0042] Figure 2 A schematic diagram of the structure of a battery provided in one embodiment of the present application;

[0043] Figure 3 An exploded view of a battery cell provided in one embodiment of the present application;

[0044] Figure 4 A partial cross-sectional view of a battery cell provided in one embodiment of the present application;

[0045] Figure 5 A partial cross-sectional view of two connecting components in a stacked state provided by an embodiment of the present application;

[0046] Figure 6 A schematic diagram of the structure of a connecting component provided in one embodiment of the present application;

[0047] Figure 7 A schematic diagram of a plurality of first protrusions of a connecting component provided in an embodiment of the present application;

[0048] Figure 8 A schematic diagram of a plurality of first protrusions of a connecting component provided in another embodiment of the present application;

[0049] Fig. 9 A schematic diagram of a groove of a connecting component provided in an embodiment of the present application;

[0050] Fig.10 A schematic diagram of a second protrusion of a connecting component provided in an embodiment of the present application;

[0051] Fig.11 A schematic diagram of a second protrusion of a connecting component provided in another embodiment of the present application;

[0052] Fig.12 A partial cross-sectional view of two connecting components in a stacked state provided by another embodiment of the present application;

[0053] Fig.13 for Fig.12 A schematic diagram of the structure of the connecting components provided;

[0054] Fig.14 A schematic diagram of the structure of a connecting component provided in yet another embodiment of the present application;

[0055] Fig.15 A schematic structural diagram of a connecting component provided in yet another embodiment of the present application;

[0056] Fig.16 is a schematic flow chart of a method for manufacturing a battery cell according to an embodiment of the present application;

[0057] Fig.17 A schematic block diagram of a battery cell manufacturing device according to an embodiment of the present application;

[0058] In the drawings, the drawings are not drawn to scale.

[0059] Marking description: 100-battery; 101-box; 1011-first part; 1012-second part; 10-battery cell; 11-electrode terminal; 12-electrode assembly; 121-positive electrode ear; 122-negative electrode ear; 13-connecting component; 131-body; 1311-first surface; 1312-second surface; 132-convex part; 1321-end wall; 1322-side wall; 133-concave part; 134-gap control part; 1341 -first protrusion; 1342-groove; 1343-step surface; 1344-second protrusion; 14-shell; 141-end opening; 15-end cover; 151-first mounting hole; 16-insulating member; 161-second mounting hole; 200-motor; 300-controller; 500-battery cell manufacturing equipment; 501-first providing module; 502-second providing module; 503-third providing module; 504-installation module; 1000-vehicle. DETAILED DESCRIPTION

[0060] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0061] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing 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, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0062] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0063] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells.

[0064] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0065] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as 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. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The positive electrode collector not coated with the negative electrode active material layer protrudes from the positive electrode collector coated with the negative electrode active material layer. The positive electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current can pass without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a laminated structure, and the embodiments of the present application are not limited thereto.

[0066] The battery cell also includes a connecting component and an electrode terminal. The connecting component is used to connect the electrode assembly and the electrode terminal to extract the electric energy of the electrode assembly through the electrode terminal. Correspondingly, the electrode terminal connected to the positive electrode tab is the positive electrode terminal, and the electrode terminal connected to the negative electrode tab is the negative electrode terminal. In order to achieve the connection between the connecting component and the electrode terminal, the connecting component includes a protrusion, which extends into the through hole of the end cover of the battery cell and is fixed to the electrode terminal, or, when an insulating member is provided on the side of the end cover facing the electrode assembly, the protrusion passes through the through hole of the insulating member and extends into the through hole of the end cover to be fixed to the electrode terminal, or the protrusion and the electrode terminal can be connected in the through hole of the insulating member. Correspondingly, the connecting component is provided with a recess corresponding to the position of the protrusion.

[0067] In the production process of batteries, in order to reduce space occupation, multiple connecting parts are usually stacked up and down in the fixture, and adjacent connecting parts are prone to stacking jams, that is, the upper and lower connecting parts cannot be separated, resulting in the robot arm taking two or more connecting parts at a time when taking materials from the fixture. The inventor found that the reason for the stacking jams of the connecting parts is that the two sides of the connecting parts are respectively provided with convex parts and concave parts. The convex parts of the connecting parts will correspond to the concave parts of the adjacent connecting parts when stacked. When the robot arm takes the materials, due to the weight of the connecting parts and the downward pressure of the robot arm on the connecting parts, most of the convex parts of the upper connecting parts extend into the concave parts of the lower connecting parts, or most of the convex parts of the lower connecting parts extend into the concave parts of the upper connecting parts, thereby causing the two connecting parts to be stuck together.

[0068] In view of this, the present application provides a technical solution, wherein a connecting component includes a main body, a convex portion, a concave portion and a gap control portion, the main body includes a first surface and a second surface opposite to each other along its thickness direction, the convex portion is connected to the main body and protrudes from the first surface, the concave portion is arranged on the second surface and corresponds to the position of the convex portion, and the gap control portion is configured to contact the other connecting component when the connecting component to which it belongs is stacked with the other connecting component, and through the contact between the gap control portion and the other connecting component, the gap D between the two connecting components is controlled to be greater than 0.6H (H is the height of the convex portion protruding from the first surface), so that most of the area of ​​the convex portion is located outside the concave portion of the other connecting component, because the direction in which the convex portion protrudes from the first surface is parallel to the stacking direction, only the height area of ​​the convex portion less than or equal to 0.4H is located in the concave portion of the other connecting component, and the contact area between the outer surface of the convex portion and the inner surface of the concave portion of the other connecting component is small, which effectively reduces the risk of material jamming between the two connecting components, facilitates material removal (connecting components) during production, and improves production efficiency.

[0069] For the convenience of writing, the stacking of the two connecting components in the embodiment of the present application is stacking in the direction of gravity.

[0070] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use batteries, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0071] 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 using batteries. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0072] For example, Figure 1 A schematic structural diagram of a vehicle 1000 according to an embodiment of the present application is shown. The vehicle 1000 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 battery 100 is arranged inside the vehicle 1000. For example, a battery 100 may be arranged at the bottom, front or rear of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, such as for the working power requirements during the start-up, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery 100 may not only be used 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 force for the vehicle 1000.

[0073] A motor 200 and a controller 300 may also be provided inside the vehicle 1000 . The controller 300 is used to control the battery 100 to supply power to the motor 200 , for example, to meet the power requirements for starting, navigating, and driving the vehicle 1000 .

[0074] In order to meet different power requirements, the battery 100 may include a plurality of battery cells, wherein the plurality of battery cells may be connected in series, in parallel, or in a hybrid connection, wherein the hybrid connection refers to a mixture of series and parallel connections. The battery 100 may also be referred to as a battery pack. In some embodiments, a plurality of battery cells may be connected in series, in parallel, or in a hybrid connection to form a battery module, and a plurality of battery modules may be connected in series, in parallel, or in a hybrid connection to form the battery 100. In other words, a plurality of battery cells may directly form the battery 100, or they may first form a battery module, and then the battery module may form the battery 100.

[0075] Figure 2 A schematic structural diagram of a battery 100 according to an embodiment of the present application is shown. Figure 2In the embodiment, the battery 100 may include a case 101 and a plurality of battery cells 10. The case 101 is a hollow structure, and the plurality of battery cells 10 are accommodated in the case 101. The case 101 includes a first portion 1011 and a second portion 1012. The first portion 1011 includes an accommodation space with an opening, and the second portion 1012 is used to cover the opening of the accommodation space, so as to be connected with the first portion 1011 to form an accommodation cavity for accommodating the plurality of battery cells 10.

[0076] Figure 3 An exploded view of a battery cell 10 according to an embodiment of the present application is shown. Figure 3 In the embodiment, the battery cell 10 includes an electrode terminal 11, an electrode assembly 12 and a connecting component 13. There are two electrode terminals 11, which are respectively a positive electrode terminal and a negative electrode terminal. The positive electrode terminal is used to connect to the positive electrode tab 121 of the electrode assembly 12, and the negative electrode terminal is used to connect to the negative electrode tab 122 of the electrode assembly 12. The connecting component 13 is used to connect the electrode assembly 12 and the electrode terminal 11, and is used to extract the electric energy of the electrode assembly 12 through the electrode terminal 11. There are two connecting components 13, one connecting component 13 corresponding to the positive electrode terminal, and the other connecting component 13 corresponding to the negative electrode terminal.

[0077] like Figure 3 As shown, the battery cell 10 further includes a housing 14 and an end cap 15. The housing 14 has an end opening 141, and the electrode assembly 12 and the connecting component 13 are accommodated in the housing 14. The housing 14 is determined according to the shape of one or more electrode assemblies 12. For example, the housing 14 may be a hollow cuboid, a hollow cube, or a hollow cylinder. Figure 3 As shown, the housing 14 is a hollow cuboid. The housing 14 can be made of a conductive metal material or plastic, and optionally, the housing 14 is made of aluminum or an aluminum alloy.

[0078] The end cap 15 is configured to be disposed at the end opening 141 to form a cavity with the housing 14 to accommodate the electrode assembly 12. The electrode terminal 11 is disposed on the end cap 15, and the connecting component 13 is located on a side of the end cap 15 facing the electrode assembly 12. Figure 4 A cross-sectional view of a battery cell 10 according to an embodiment of the present application is shown. Figure 4 In order to facilitate the connection between the connecting component 13 and the electrode terminal 11, the end cover 15 is provided with a through first mounting hole 151, and two first mounting holes 151 are provided. The two first mounting holes 151 correspond to the two electrode terminals 11 one by one, and the connecting component 13 is connected to the electrode terminal 11 at the first mounting holes 151.

[0079] The battery cell 10 may also include an insulating member 16, which is arranged on one side of the end cover 15 close to the electrode assembly 12 and is used to isolate the end cover 15 and the connecting component 13. The insulating member 16 has a through second mounting hole 161, and the second mounting hole 161 is coaxially arranged with the first mounting hole 151. The connecting component 13 passes through the second mounting hole 161 and extends into the first mounting hole 151 to be fixed to the electrode terminal 11, or the connecting component 13 is connected to the electrode terminal 11 in the second mounting hole 161.

[0080] Figure 5 A partial cross-sectional view showing a stacked state of two connecting components 13 according to an embodiment of the present application is shown; Figure 6 A schematic structural diagram of a connecting component 13 according to an embodiment of the present application is shown. Figure 5 and Figure 6 In the figure, the connecting component 13 includes a body 131, a protrusion 132, a recess 133 and a gap control portion 134. The body 131 includes a first surface 1311 and a second surface 1312 that are opposite to each other along its thickness direction, and the thickness direction of the body 131 is the X direction in the figure. When the connecting component 13 is assembled to the battery cell 10, the first surface 1311 is configured to be away from the electrode assembly 12, the second surface 1312 is configured to face the electrode assembly 12, and the second surface 1312 of the body 131 is used to connect with the electrode assembly 12. The protrusion 132 is connected to the body 131 and protrudes from the first surface 1311, that is, the protrusion 132 protrudes from the first surface 1311 along the X direction, and the height direction of the protrusion 132 is the X direction. When the protrusion 132 is assembled with the end cap 15, at least part of the protrusion 132 can be configured to extend into the first mounting hole 151 to connect with the electrode terminal 11, or, when the end cap 15 is provided with an insulating member 16 on one side close to the electrode assembly 12, at least part of the protrusion 132 can also be configured to extend into the second mounting hole 161 to connect with the electrode terminal 11, or, at least part of the protrusion 132 can also be configured to extend through the second mounting hole 161 into the first mounting hole 151 to connect with the electrode terminal 11. The recess 133 is provided on the second surface 1312 and corresponds to the position of the protrusion 132. Figure 5 As shown, the gap control portion 134 is configured to contact the upper layer connection component 13 when the lower layer connection component 13 is stacked with the upper layer connection component 13, so as to control the gap D between the two connection components 13 to be greater than 0.6H, where H is the height of the convex portion 132 protruding from the first surface 1311. That is, the area of ​​the convex portion 132 exceeding 0.6H is located outside the concave portion 133.

[0081] It should be noted that the gap D between the two stacked connecting parts 13 can be the distance between the bodies 131 of the two connecting parts 13 along the stacking direction (X direction). In the embodiment of the present application, the stacking direction of the connecting parts 13 is described as the up-down direction, and the convex part of the connecting part 13 is arranged downward, that is, the stacking direction is the X direction in the figure, and the X direction can be the thickness direction of the connecting part 13. For example, Figure 5 As shown, taking the case where two connecting components 13 are stacked along the gravity direction and the protrusion 132 is arranged downward as an example, the gap D between the two connecting components 13 can be the distance between the second surface 1312 of the lower connecting component 13 and the first surface 1311 of the upper connecting component 13.

[0082] The concave portion 133 of the connecting member 13 corresponds to the convex portion 132, that is, the convex portion 132 is formed on the first surface 1311 and the concave portion 133 is formed on the second surface 1312. When two connecting members 13 are stacked, the convex portion 132 of the upper connecting member 13 corresponds to the concave portion 133 of the lower connecting member 13.

[0083] According to the connecting component 13 of the embodiment of the present application, the connecting component 13 is provided with a gap control part 134. When the two connecting components 13 are stacked up and down, the convex part 132 of the upper connecting component 13 corresponds to the concave part 133 of the lower connecting component 13, and the gap control part 134 of the lower connecting component 13 contacts the upper connecting component 13, or the gap control part 134 of the upper connecting component 13 contacts the lower connecting component 13. The gap D between the two connecting components 13 can be controlled to be greater than 0.6H by the gap control part 134, so that most of the area of ​​the convex part 132 of the upper connecting component 13 is located outside the concave part 133 of the lower connecting component 13, thereby reducing the overlapping area of ​​the two connecting components 13, and further reducing the contact area between the outer surface of the convex part 132 and the inner surface of the concave part 13, effectively reducing the risk of material jamming of the two stacked connecting components 13, and facilitating the material removal (connecting component 13) of only one connecting component 13 at a time during the production process, thereby improving production efficiency. It should be pointed out that the inner surface of the recess 133 refers to the surface surrounding the recess 133; the outer surface of the convex portion 132 refers to the surface of the convex portion 132 facing away from the recess 133, that is, the surface of the convex portion 132 exposed to the first surface 1311 of the body 131.

[0084] It should be pointed out that, along the X direction, when the area of ​​the height of the convex part 132 greater than 0.4H extends into the concave part 133, the risk of the two connecting parts 13 being stuck is relatively high; that is, when the area of ​​the convex part 132 of the upper connecting part 13 greater than 0.4H extends into the concave part 133 of the lower connecting part 13, the probability of the outer surface of the convex part 132 contacting the inner surface of the concave part 133 is relatively high, which easily leads to the two connecting parts being stuck. Therefore, the gap control part 134 of the present application is configured to control the area of ​​the convex part 132 of the upper connecting part 13 less than or equal to 0.4H to extend into the concave part 133 of the lower connecting part 13, that is, to control the gap D between the upper connecting part 13 and the lower transition part 13 to be greater than 0.6H.

[0085] Preferably, the gap control unit 134 is configured to control the gap D between the two connecting components 13 to be greater than or equal to 0.8H.

[0086] According to some embodiments of the present application, the convex portion 132 includes an end wall 1321 and a side wall 1322, the side wall 1322 is arranged around the end wall 1321, the side wall 1322 is connected to the body 131, and the end wall 1321 and the side wall 1322 form a concave portion 133. In other words, the side wall 1322 is located between the end wall 1321 and the body 131, that is, the side wall 1322 connects the end wall 1321 and the body 131; the end of the side wall 1322 connected to the body 131 is the open end of the concave portion 133, and the end wall 1321 is the closed end of the concave portion 133. The end wall 1321 is used to connect to the electrode terminal 11.

[0087] According to some embodiments of the present application, the angle α between the side wall 1322 and the end wall 1321 is greater than 90°. That is, in the X direction, the cross-sectional dimension of the protrusion 132 gradually decreases from the end close to the first surface 1311 to the direction of the end wall 1321. In other words, the protrusion 132 is a gradual structure. It should be pointed out that the cross-sectional dimension of the protrusion 132 refers to the dimension of the cross section of the protrusion 132 perpendicular to the X direction. The above-mentioned setting method, on the one hand, adapts to the first mounting hole 151 of the end cover 15, so that the end wall 1321 of the protrusion 132 extends into the first mounting hole 151 of the end cover 15; on the other hand, by setting the angle α between the side wall 1322 and the end wall 1321 to an obtuse angle, it is convenient for processing and manufacturing, for example, it is convenient for demolding.

[0088] According to some embodiments of the present application, the body 131, the convex portion 132 and the concave portion 133 are integrally formed. For example, the connecting component 13 is a stamped part, and after the convex portion 132 is stamped out on the first surface 1311 of the body 131, the concave portion 133 is formed on the second surface 1312 of the body 131 for easy processing.

[0089] According to some embodiments of the present application, the gap control part 134 may be provided on the convex part 132. In this case, the gap D between the two connecting parts 13 may be reflected by the depth of the convex part 132 of the upper connecting part 13 entering the concave part 133 of the lower connecting part 13, that is, the gap D is the height H of the convex part 132 protruding from the first surface 1311 minus the depth of the convex part 132 of the upper connecting part 13 entering the concave part 133 of the lower connecting part 13. The gap control part 134 is used to control the depth of the convex part 132 of the upper connecting part 13 entering the concave part 133 of the lower connecting part 13, so as to reduce or avoid the risk of material jamming of the two stacked connecting parts 13 and improve production efficiency.

[0090] According to some embodiments of the present application, Figure 5 and Figure 6 As shown, the gap control portion 134 may include a first protrusion 1341, which may be disposed at the connection between the protrusion 132 and the body 131 and exposed to the second surface 1312, that is, the first protrusion 1341 is located at the opening end of the recess 133. Figure 5 As shown, when the two connecting components 13 are stacked, the first protrusion 1341 of the lower connecting component 13 contacts the convex portion 132 of the upper connecting component 13. The above embodiment has a simple structure. By setting the first protrusion 1341, it is possible to limit the convex portion 132 of the upper connecting component 13 from entering the concave portion 133 of the lower connecting component 13 when the two connecting components 13 are stacked, thereby reducing the overlapping area of ​​the two connecting components 13, achieving a good gap control effect, reducing or avoiding the risk of material jamming of the two connecting components 13, and improving production efficiency.

[0091] According to some embodiments of the present application, Figure 6 As shown, the first protrusion 1341 is an annular protrusion extending along the circumference of the protrusion 132. When the first protrusion 1341 is an annular protrusion, when the two connecting components 13 are stacked, the first protrusion 1341 of the lower connecting component 13 has a larger contact area with the upper connecting component 13, the stacking support of the two connecting components 13 is stable, and the depth of the protrusion 132 of the upper connecting component 13 entering the concave portion 133 of the lower connecting component 13 is effectively controlled, reducing the risk of material jamming of the two connecting components 13 and improving production efficiency.

[0092] or, Figure 7 FIG. 1 is a schematic diagram showing a plurality of first protrusions 1341 of a connecting component 13 according to an embodiment of the present application. Figure 8 A schematic diagram of a plurality of first protrusions 1341 of a connecting component 13 of another embodiment of the present application is shown. Figure 7 and Figure 8As shown, the number of the first protrusions 1341 is multiple, and the multiple first protrusions 1341 are distributed at intervals along the circumference of the convex portion 132. When the number of the first protrusions 1341 is multiple, when two connecting components 13 are stacked, in the circumference of the convex portion 132, the multiple first protrusions 1341 can increase the contact positions of the two connecting components 13, form multiple positions for stacking and supporting the connecting components 13, ensure the stability of the stacking and supporting of the two connecting components 13, effectively control the depth of the convex portion 132 of the upper connecting component 13 entering the concave portion 133 of the lower connecting component 13, reduce the risk of material jamming of the two connecting components 13, and improve production efficiency.

[0093] It should be noted that when there are multiple first protrusions 1341, and the multiple first protrusions 1341 are distributed at intervals along the circumference of the convex portion 132, as shown in FIG. Figure 7 As shown, the first protrusion 1341 may be a block structure, or, as shown in Figure 8 As shown, the first protrusion 1341 may also be a strip-shaped structure extending along the circumference of the protrusion 132 .

[0094] According to some embodiments of the present application, Fig. 9 A schematic diagram showing a groove of a connecting component 13 according to an embodiment of the present application is shown. Fig. 9 It is a partial cross-sectional view of the stacked state of two connected parts, such as Fig. 9 As shown, the gap control part 134 may include a groove 1342, which is arranged on the outer surface of the convex part 132 and located at the connection between the end wall 1321 and the side wall 1322. The groove 1342 is an annular groove arranged around the end wall 1321, and the groove 1342 forms an annular step surface 1343 on the side wall 1322. When two connecting parts 13 are stacked, the groove 1342 of the upper connecting part 13 cooperates with the body 131 of the lower connecting part 13, that is, the step surface 1343 of the upper connecting part 13 contacts the second surface 1312 of the lower connecting part 13, so as to control the depth of the convex part 132 of the upper connecting part 13 entering the concave part 133 of the lower connecting part 13, which can effectively control the gap between two adjacent stacked connecting parts 13, reduce or avoid the risk of material jamming, and improve production efficiency.

[0095] According to some embodiments of the present application, the gap control part 134 can also be arranged on the main body 131. In this case, when two connecting parts 13 are stacked, the gap control part 134 of the upper connecting part 13 contacts the main body 131 of the lower connecting part 13, and / or the gap control part 134 of the lower connecting part 13 contacts the main body 131 of the upper connecting part 13, so as to control the gap D between the two connecting parts 13 to be greater than 0.6H, that is, control the depth of the convex part 132 of the upper connecting part 13 entering the concave part 133 of the lower connecting part 13 to be less than 0.4H, so as to reduce or avoid the risk of material jamming of the two stacked connecting parts 13 and improve production efficiency.

[0096] According to some embodiments of the present application, the gap control portion 134 may include a second protrusion, which is provided on the body 131 and protrudes from the first surface 1311 and / or the second surface 1312. For example, the second protrusion 1344 may protrude from the first surface 1311 and the second surface 1312. In this case, there are multiple second protrusions 1344, a part of the second protrusions 1344 protrudes from the first surface 1311, and another part of the second protrusions 1344 protrudes from the second surface 1312. When the two connecting components 13 are stacked, the second protrusions 1344 protruding from the first surface 1311 of the upper connecting component 13 are in contact with the second surface 1312 of the lower connecting component 13, and the second protrusions 1344 protruding from the second surface 1312 of the lower connecting component 13 are in contact with the first surface 1311 of the upper connecting component 13; or, Fig.10 A schematic diagram of the second protrusion 1344 of the connecting component 13 according to an embodiment of the present application is shown. Fig.10 As shown, the second protrusion 1344 may only protrude from the first surface 1311, and the second protrusion 1344 of the upper connecting component 13 protruding from the first surface 1311 contacts the second surface 1312 of the lower connecting component 13; or, Fig.11 A schematic diagram of the second protrusion 1344 of the connecting component 13 of another embodiment of the present application is shown. Fig.11 As shown, the second protrusion 1344 may only protrude from the second surface 1312, and the second protrusion 1344 of the lower connecting component 13 protruding from the second surface 1312 contacts the first surface 1311 of the upper connecting component 13. By providing the second protrusion 1344 on the body 131, when two connecting components 13 are stacked, the gap between the two connecting components 13 can be effectively controlled to reduce or avoid the risk of material jamming of the two stacked connecting components 13, thereby improving production efficiency.

[0097] According to some embodiments of the present application, Fig.10 As shown, the second protrusion 1344 protrudes from the first surface 1311 and is inclined toward the convex portion 132; or, as shown Fig.11As shown, the second protrusion 1344 protrudes from the second surface 1312 and is tilted toward the recessed portion 133. When two connecting components 13 are stacked, since the second protrusion 1344 is tilted toward the protrusion 132, the second protrusion 1344 is driven by the gravity or external force of the other connecting component 13 to deform toward the protrusion 132, and the second protrusion 1344 itself is tilted toward the protrusion 132, and the second protrusion 1344 is difficult to deform, which can effectively control the depth of the protrusion 132 of the upper connecting component 13 entering the recessed portion 133 of the lower connecting component 13, thereby reducing the risk of material jamming.

[0098] Fig.12 A partial cross-sectional view showing a stacked state of two connecting components 13 according to another embodiment of the present application; Fig.13 Shows Fig.12 According to some embodiments of the present application, the number of the second protrusions 1344 is multiple, and the multiple second protrusions 1344 are distributed around the recess 133 at intervals. Fig.12 and Fig.13 As shown, taking the second protrusion 1344 protruding from the second surface 1312 as an example, multiple second protrusions 1344 are spaced around the recess 133 to form multiple support positions around the recess 133. By setting multiple second protrusions 1344, the two connecting parts 13 can be in contact at multiple support positions, thereby ensuring the stability of the stacking support and improving the control effect of the gap between the two stacked connecting parts 13, so as to reduce or avoid the risk of material jamming of the two stacked connecting parts 13 and improve production efficiency.

[0099] According to some embodiments of the present application, Fig.12 and Fig.13 As shown, the protrusion 132 is located on the width center line L of the connecting member 13, and the plurality of second protrusions 1344 are symmetrically distributed about the width center line L. For example, Fig.13 As shown, when a plurality of second protrusions 1344 are provided, a portion of the second protrusions 1344 extend along the Y direction, and another portion of the second protrusions 1344 extend along the Z direction, where the Z direction in the figure represents the length direction of the connecting component 13. Since the plurality of second protrusions 1344 are symmetrically distributed, when two connecting components 13 are stacked, the stacking support of the two connecting components 13 can be ensured to be stable, and the gap between the two connecting components 13 can be easily controlled. It should be noted that the Y direction in the figure represents the width direction of the connecting component 13, and the width center line L of the connecting component 13 refers to the center line of the connecting component 13 in the Y direction.

[0100] According to some embodiments of the present application, at least one second protrusion 1344 is disposed on the edge of the body 131 to facilitate processing and manufacturing.

[0101] For example, Fig.13As shown, all the second protrusions 1344 are arranged on the edge of the body 131 . When the second protrusions 1344 and the body 131 are integrally formed, for example, when the connecting component 13 is stamped, the second protrusions 1344 can be formed by bending the edge of the body 131 .

[0102] According to some embodiments of the present application, the second protrusion 1344 is disposed between the edge of the main body 131 and the recess 133, effectively controlling the gap D between the two connecting components 13 when the two connecting components 13 are stacked, so as to reduce or avoid the risk of material jamming of the two stacked connecting components 13 and improve production efficiency.

[0103] When the second protrusion 1344 is integrally formed on the main body 131, a through groove is opened between the edge of the main body 131 and the recess 133, one end of the second protrusion 1344 is connected to the groove wall, and the other end of the second protrusion 1344 extends in a direction away from the main body 131; or, when the second protrusion 1344 and the main body 131 are separately arranged, the second protrusion 1344 is fixed between the edge of the main body 131 and the recess 133 by welding or riveting.

[0104] For example, Fig.14 FIG. 1 shows a structural diagram of a connecting component 13 according to another embodiment of the present application. Fig.14 As shown, one second protrusion 1344 is disposed on the edge of the body 131 , and two second protrusions 1344 are disposed between the edge of the body 131 and the recess 133 .

[0105] According to some embodiments of the present application, the second protrusion 1344 can be integrally formed on the body 131, or the second protrusion 1344 can be separately provided from the body 131, and the second protrusion 1344 is fixed to the body 131, for example, the second protrusion 1344 and the body 131 are welded, riveted, or bonded with conductive adhesive.

[0106] Fig.15 FIG. 1 is a schematic diagram showing the structure of a connecting component 13 of another embodiment of the present application. According to some embodiments of the present application, such as Fig.15 As shown, the gap control portion 134 can also be arranged on the protrusion 132 and the main body 131, that is, the gap control portion 134 can also include a first protrusion 1341 and a second protrusion 1344. When the two connecting components 13 are stacked, the gap control between the two connecting components 13 is simultaneously achieved through the first protrusion 1341 and the second protrusion 1344.

[0107] Fig.16 FIG. 1 is a schematic flow chart of a method for manufacturing a battery cell 10 according to an embodiment of the present application. Fig.16 As shown, the method may include:

[0108] 401, providing an electrode assembly 12;

[0109] 402, providing an electrode terminal 11;

[0110] 403, providing a connecting component 13, the connecting component 13 comprising a body 131, a convex portion 132, a concave portion 133 and a gap control portion 134, the body 131 comprising a first surface 1311 and a second surface 1312 opposite to each other along a thickness direction thereof, the convex portion 132 being connected to the body 131 and protruding from the first surface 1311, the concave portion 133 being provided on the second surface 1312 and corresponding to the position of the convex portion 132, the gap control portion 134 being configured to contact the upper connecting component 13 when the lower connecting component 13 is stacked with the upper connecting component 13, and / or, the gap control portion 134 being configured to contact the lower connecting component 13 when the upper connecting component 13 is stacked with the lower connecting component 13, so as to control the gap D between the two connecting components 13 to be greater than 0.6H, where H is the height of the convex portion 132 protruding from the first surface 1311;

[0111] 404 , connecting the body 131 to the electrode assembly 12 , and connecting the protrusion 132 to the electrode terminal 11 .

[0112] It should be noted that the order of step “401, providing electrode assembly 12”, step “402, providing electrode terminal 11” and step “403, providing connecting component 13” is not limited. For example, step “402, providing electrode terminal 11”, step “401, providing electrode assembly 12” and step “403, providing connecting component 13” may be performed in sequence; or step “403, providing connecting component 13”, step “401, providing electrode assembly 12” and step “402, providing electrode terminal 11” may be performed in sequence.

[0113] Fig.17 FIG. 5 is a schematic block diagram of a battery cell manufacturing device 500 according to an embodiment of the present application. Fig.17 As shown, the battery cell manufacturing equipment 500 may include: a first providing module 501 , a second providing module 502 , a third providing module 503 and a mounting module 504 .

[0114] The first providing module 501 is used to provide the electrode assembly 12; the second providing module 502 is used to provide the electrode terminal 11; the third providing module 503 is used to provide the connecting component 13, the connecting component 13 includes a main body 131, a convex portion 132, a concave portion 133 and a gap control portion 134, the main body 131 includes a first surface 1311 and a second surface 1312 opposite to each other along its thickness direction, the convex portion 132 is connected to the main body 131 and protrudes from the first surface 1311, the concave portion 133 is arranged on the second surface 1312 and corresponds to the position of the convex portion 132, the gap control portion 134 is configured to contact the upper connecting component 13 when the lower connecting component 13 is stacked with the upper connecting component 13, and / or, the gap control portion 134 is configured to contact the lower connecting component 13 when the upper connecting component 13 is stacked with the lower connecting component 13, so as to control the gap D between the two connecting components 13 to be greater than 0.6H, H is the height of the convex portion 132 protruding from the first surface 1311.

[0115] The mounting module 504 is used to connect the body 131 with the electrode assembly 12 , and to connect the protrusion 132 with the electrode terminal 11 .

[0116] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: Electrode assembly; Electrode terminal; A connecting component, the connecting component comprising: A body, comprising a first surface and a second surface opposite to each other along a thickness direction thereof, wherein the body is connected to the electrode assembly; a convex portion connected to the body and protruding from the first surface, wherein the convex portion is connected to the electrode terminal; a concave portion, disposed on the second surface and corresponding to the position of the convex portion; a gap control portion, wherein the gap control portion is configured to contact the other connecting component when the connecting component to which it belongs is stacked with the other connecting component, so as to control the gap D between the two connecting components to be greater than 0.6H, where H is the height of the protrusion protruding from the first surface; The convex portion includes an end wall and a side wall, the side wall is arranged around the end wall, the side wall is connected to the body, the end wall and the side wall form the concave portion, the angle between the side wall and the end wall is greater than 90°, and the gap control portion includes a first protrusion, the first protrusion is arranged at the connection between the convex portion and the body and exposed to the second surface; The orthographic projection of the first protrusion on a plane perpendicular to the thickness direction of the body does not overlap with the orthographic projection of the convex portion on a plane perpendicular to the thickness direction of the body.

2. The battery cell according to claim 1, characterized in that: The first protrusion is an annular protrusion extending along the circumference of the convex portion; Alternatively, there are multiple first protrusions, and the multiple first protrusions are arranged at intervals along the circumferential direction of the convex portion.

3. The battery cell according to claim 1, characterized in that: The gap control portion includes a groove, which is arranged on the outer surface of the convex portion and located at the connection between the end wall and the side wall, and the groove is an annular groove arranged around the end wall.

4. The battery cell according to claim 1, characterized in that: The gap control portion includes a second protrusion, which is disposed on the body and protrudes from the first surface and / or the second surface.

5. The battery cell according to claim 4, characterized in that: The second protrusion protrudes from the first surface and is inclined toward the convex portion; Alternatively, the second protrusion protrudes from the second surface and is inclined toward the recess.

6. The battery cell according to claim 4, characterized in that: There are multiple second protrusions, and the multiple second protrusions are distributed around the recess at intervals.

7. The battery cell according to claim 6, characterized in that: The convex portion is located on a width center line of the connecting component, and a plurality of the second protrusions are symmetrically distributed about the width center line.

8. The battery cell according to claim 6, characterized in that: At least one of the second protrusions is disposed on the edge of the body.

9. A battery, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 8.

10. An electrical device, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 8.

11. A method for manufacturing a battery cell, characterized in that: The method comprises: providing an electrode assembly; Providing electrode terminals; A connecting component is provided, the connecting component comprising a body, a convex portion, a concave portion and a gap control portion, the body comprising a first surface and a second surface opposite to each other along a thickness direction thereof, the body being connected to the electrode assembly, the convex portion being connected to the body and protruding from the first surface, the convex portion being connected to the electrode terminal, the concave portion being arranged on the second surface and corresponding to the position of the convex portion, the gap control portion being configured to contact the other connecting component when the connecting component to which it belongs is stacked with the other connecting component, so as to control the gap D between the two connecting components to be greater than 0.6H, where H is the convex portion. The protrusion protrudes from the height of the first surface, the protrusion includes an end wall and a side wall, the side wall is arranged around the end wall, the side wall is connected to the body, the end wall and the side wall form the concave portion, the angle between the side wall and the end wall is greater than 90°, the gap control portion includes a first protrusion, the first protrusion is arranged at the connection between the protrusion and the body and exposed to the second surface, wherein the orthographic projection of the first protrusion on a plane perpendicular to the thickness direction of the body does not overlap with the orthographic projection of the protrusion on a plane perpendicular to the thickness direction of the body; The body is connected to the electrode assembly, and the protrusion is connected to the electrode terminal.

12. A battery cell manufacturing device, characterized in that: The device comprises: A first providing module, for providing an electrode assembly; A second providing module, used for providing electrode terminals; The third providing module is used to provide a connecting component, wherein the connecting component includes a body, a convex portion, a concave portion and a gap control portion, wherein the body includes a first surface and a second surface opposite to each other along a thickness direction thereof, the body is connected to the electrode assembly, the convex portion is connected to the body and protrudes from the first surface, the convex portion is connected to the electrode terminal, the concave portion is provided on the second surface and corresponds to the position of the convex portion, and the gap control portion is configured to contact the other connecting component when the connecting component to which it belongs is stacked with the other connecting component, so as to control the gap D between the two connecting components to be greater than 0.6H, H is the height of the convex portion protruding from the first surface, the convex portion includes an end wall and a side wall, the side wall is arranged around the end wall, the side wall is connected to the body, the end wall and the side wall form the concave portion, the angle between the side wall and the end wall is greater than 90°, the gap control portion includes a first protrusion, the first protrusion is arranged at the connection between the convex portion and the body and exposed to the second surface, wherein the orthographic projection of the first protrusion on a plane perpendicular to the thickness direction of the body does not overlap with the orthographic projection of the convex portion on a plane perpendicular to the thickness direction of the body; A mounting module is used to connect the body with the electrode assembly and to connect the protrusion with the electrode terminal.

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