Battery cell, battery and electric device

Abstract

Disclosed in the present application are a battery cell, a battery and an electric device. The battery cell comprises a casing, an electrode terminal and an insulating member. The casing has a first wall, the first wall being provided with a first through hole. The electrode terminal is arranged in the first through hole, and has a first end in a first direction, the first direction being parallel to the thickness direction of the first wall. At least part of the insulating member is arranged between the electrode terminal and a hole wall of the first through hole, and the insulating member is connected to the electrode terminal and the first wall. In the first direction, a projection of the first end does not overlap a projection of the insulating member. By means of the technical solution provided in the present application, the reliability of the battery can be improved.

Description

Battery cells, batteries, and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2023218980827, filed on July 19, 2023, entitled “Battery Cell, Battery, and Electrical Equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0004] Energy conservation and emission reduction are the key to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their energy-saving and environmental protection advantages.

[0005] For electric vehicles, battery technology is an important factor related to their development. How to improve battery reliability is a technical problem that needs to be solved urgently in battery technology.

[0006] Summary of the Invention

[0007] The present application provides a battery cell, a battery, and an electrical device. The technical solution provided in the present application can improve the reliability of the battery.

[0008] This application is achieved through the following technical solutions:

[0009] In a first aspect, some embodiments of the present application provide a battery cell, comprising a housing, an electrode terminal, and an insulating member. The housing has a first wall, the first wall having a first through-hole. The electrode terminal is disposed in the first through-hole, and the electrode terminal has a first end along a first direction parallel to the thickness of the first wall. At least a portion of the insulating member is disposed between the electrode terminal and the wall of the first through-hole, and the insulating member connects the electrode terminal and the first wall. Along the first direction, a projection of the first end does not overlap with a projection of the insulating member.

[0010] In the above scheme, on the one hand, the electrode terminal and the first wall are connected by an insulating member so that the electrode terminal can be fixed to the first wall. On the other hand, the shape of the electrode terminal is limited so that the projection of the first end of the electrode terminal does not overlap with the projection of the insulating member, that is, the flange on the first end of the electrode terminal is eliminated, thereby reducing the risk of damage to the insulating member caused by interference with the insulating member during the process of bending the end of the electrode terminal outward to form a flange, thereby effectively improving the insulation of the insulating member, reducing the risk of short circuit of the battery cell, and thus improving the reliability of the battery.

[0011] According to some embodiments of the present application, the insulating member is thermally composite-connected to the electrode terminal.

[0012] In the above solution, the insulating member and the battery terminal are connected through a thermal composite process, which can reduce the difficulty of connecting the electrode terminal and the insulating member, improve the manufacturing efficiency of the battery, and enable the electrode terminal to be stably installed in the first through hole.

[0013] According to some embodiments of the present application, along the first direction, the first end is an end of the electrode terminal away from the interior of the housing.

[0014] In the above solution, the first end is the end of the electrode terminal located outside the shell, that is, the end of the electrode terminal away from the inside of the shell may not form a flange, thereby reducing the risk of damage to the part of the insulating part outside the shell due to interference from the flange, thereby improving the reliability of the battery.

[0015] According to some embodiments of the present application, along the first direction, the first wall has a first surface away from the interior of the housing, and a portion of the insulating member is disposed on the first surface.

[0016] In the above scheme, the first surface can be the outer surface of the first wall. By arranging part of the insulating part on the first surface, on the one hand, the creepage distance between the electrode terminal and the first wall can be increased, and the insulating effect of the insulating part can be improved; on the other hand, the part of the insulating part arranged on the first surface can limit the displacement of the insulating part along the first direction, reduce the risk of displacement of the insulating part, and improve the insulation effect; on the other hand, the part of the insulating part arranged on the first surface can be regarded as the insulating part overlapping the first wall, so that the electrode terminal can be stably installed on the first wall.

[0017] According to some embodiments of the present application, the battery cell further includes a connector located on a side of the first wall away from the interior of the housing, the connector being connected to the first end for limiting movement of the electrode terminal along the first direction.

[0018] In the above scheme, by providing a connecting member and positioning the connecting member on the outside of the first wall, the flange of the current electrode terminal can be replaced. On the one hand, it does not interfere with the insulating member, reducing the risk of damage and failure of the insulating member. On the other hand, it can effectively constrain the electrode terminal, limit the movement of the electrode terminal along the first direction, reduce the risk of the electrode terminal falling off, and improve the reliability of the battery.

[0019] According to some embodiments of the present application, along the first direction, a portion of the insulating member disposed on the first surface is located between the connecting member and the first wall.

[0020] In the above solution, the insulating member is partially located between the connector and the first wall. On the one hand, the insulating member can be constrained by the connector and the first wall, allowing for stable installation on the first wall. This reduces the risk of displacement of the insulating member, reduces the risk of battery cell short circuits, and improves battery reliability. On the other hand, when the connector is conductive, the insulating member insulates and isolates the connector from the first wall, reducing the risk of battery cell short circuits.

[0021] According to some embodiments of the present application, along the first direction, the first end protrudes from the first surface, and the connecting member is connected to at least a portion of the circumference of the portion of the first end protruding from the first surface; or, the connecting member is connected to the end surface of the first end.

[0022] The above solution, by arranging the connector on the circumferential surface and / or end surface of the first end, can ensure a stable connection relationship between the connector and the first end, effectively constrain the electrode terminal, reduce the risk of electrode terminal displacement, and improve the reliability of the battery.

[0023] According to some embodiments of the present application, the connecting member is ring-shaped and is disposed around the first end.

[0024] In the above scheme, by setting the connecting member to a ring shape, on the one hand, the connecting member can be arranged along the circumference of the electrode terminal to be connected to the electrode terminal in the circumferential direction of the electrode terminal, thereby effectively constraining the electrode terminal, reducing the risk of displacement of the electrode terminal, and improving the reliability of the battery; on the other hand, the inner ring of the connecting member can expose the middle part of the electrode terminal, so that the electrode terminal can be connected to an external component to realize external charging and discharging.

[0025] According to some embodiments of the present application, the electrode terminal is provided with a liquid injection hole along the first direction, and the liquid injection hole passes through the electrode terminal and communicates with the interior of the shell.

[0026] In the above solution, by integrating the injection hole into the electrode terminal, the structural strength of the first wall can be improved compared to the solution of providing the injection hole on the first wall, thereby improving the structural strength of the shell and reducing the risk of electrolyte leakage due to shell damage, thereby making the battery more reliable.

[0027] According to some embodiments of the present application, the connecting member closes the liquid injection hole.

[0028] In the above scheme, by providing a connector and closing the liquid injection hole, on the one hand, the connector can replace the current flange of the electrode terminal, effectively constrain the electrode terminal without interfering with the insulating member, limit the movement of the electrode terminal along the first direction, reduce the risk of the electrode terminal falling off, and improve the reliability of the battery; on the other hand, the connector can replace the current sealing nail of the battery to close the liquid injection hole and reduce the risk of electrolyte leakage.

[0029] According to some embodiments of the present application, along the first direction, a projection of the connecting member covers a projection of the first end.

[0030] In the above scheme, by limiting the projection of the connecting member to cover the projection of the first end, on the one hand, the connecting member can have a larger effective area on the electrode terminal, so as to effectively constrain the electrode terminal and reduce the risk of displacement of the electrode terminal. On the other hand, the connecting member can effectively close the injection hole, reduce the risk of electrolyte leakage, and make the battery have higher reliability.

[0031] According to some embodiments of the present application, a first groove is formed on the end surface of the first end, and the liquid injection hole is located at the bottom of the first groove.

[0032] In the above scheme, a first groove is provided on the end face of the first end so that an injection hole can be formed at the bottom of the first groove. On the one hand, the injection hole can be made lower than the end face of the first end, thereby reducing the risk of electrolyte leakage from the injection hole. On the other hand, by forming a groove on the end face of the first end, the weight of the electrode terminal can be reduced, thereby improving the weight energy density of the battery.

[0033] According to some embodiments of the present application, a second groove is formed on a surface of the connector facing the electrode terminal along the first direction, the first end is disposed in the second groove, and a portion of the connector is located in the first groove.

[0034] In the above scheme, by providing the second groove, the connector can be effectively connected to the first end, and part of the connector can be located in the first groove. On the one hand, the center of gravity of the connector is lowered, the connection stability between the connector and the first end is improved, and the risk of the electrode terminal falling off is reduced; on the other hand, by providing part of the connector in the first groove, the space of the first groove can be effectively utilized, saving the space occupied by the connector in the first direction, and improving the volume energy density of the battery cell.

[0035] According to some embodiments of the present application, a third groove is formed on a surface of the connector away from the electrode terminal along the first direction, and the second groove and the third groove are correspondingly arranged.

[0036] In the above scheme, by setting a third groove on the outer surface of the connecting piece, on the one hand, a gripping position can be provided for a robot or a worker to grip the connecting piece. On the other hand, the third groove is set corresponding to the second groove, so that the position of the second groove can be determined on the outside of the connecting piece, so as to accurately align the second groove with the first end, thereby improving installation efficiency.

[0037] According to some embodiments of the present application, a flange is provided on the circumferential surface of the connecting member, and the flange is connected to a portion of the insulating member provided on the first surface.

[0038] In the above solution, by providing a flange and connecting the flange to a portion of the insulating member, a seal can be formed between the protrusion and the insulating member, thereby reducing the risk of electrolyte leakage.

[0039] According to some embodiments of the present application, the connecting member is welded to the first end.

[0040] In the above solution, the connector is welded to the first end, which enables a stable connection between the connector and the first end, so that the connector can effectively constrain the electrode terminal, reduce the risk of displacement of the electrode terminal, and improve the reliability of the battery.

[0041] According to some embodiments of the present application, the connecting member is a metal member.

[0042] In the above solution, when the connecting member is a metal member, it has a high structural strength and can effectively constrain the electrode assembly, so that the battery cell has a long service life.

[0043] According to some embodiments of the present application, the electrode terminal has a second end, which is arranged opposite to the first end along the first direction and is located on a side of the first wall away from the first end. Along the first direction, a projection of the second end partially overlaps with a projection of the first wall.

[0044] In the above scheme, by setting the projection of the second end to overlap with the projection of the first wall, the second end can act on the side of the first wall away from the first end to limit the displacement of the electrode terminal along the first direction, thereby reducing the risk of the electrode terminal falling off and improving the reliability of the battery.

[0045] According to some embodiments of the present application, a portion of the insulating member is located between the first wall and the second end.

[0046] In the above solution, by arranging part of the insulating member between the first wall and the second end, the second end and the shell can be effectively insulated and isolated, reducing the risk of battery cell short circuit caused by overlapping of the electrode terminal and the shell, and improving the reliability of the battery.

[0047] In a second aspect, some embodiments of the present application further provide a battery, comprising the battery cell provided in any one of the first aspects.

[0048] In a third aspect, some embodiments of the present application further provide an electrical device, which includes a battery cell provided in any one of the first aspects, and the battery cell is used to provide electrical energy.

[0049] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0051] FIG1 is a schematic diagram of a vehicle in some embodiments of the present application;

[0052] FIG2 is an exploded perspective view of a battery provided in some embodiments of the present application;

[0053] FIG3 is an exploded perspective view of a battery cell in some embodiments of the present application;

[0054] FIG4 is a cross-sectional view of a first wall, an electrode terminal, and an insulating member in some embodiments of the present application;

[0055] Figure 5 is an enlarged view of point A in Figure 4;

[0056] FIG6 is a perspective view of a connecting member, a first wall, an electrode terminal, and an insulating member in some embodiments of the present application;

[0057] FIG7 is a perspective view of a connector in some embodiments of the present application;

[0058] FIG8 is a cross-sectional view of a connecting member, a first wall, an electrode terminal, and an insulating member in some embodiments of the present application;

[0059] FIG9 is an enlarged view of point B in FIG8 ;

[0060] FIG10 is a schematic diagram of a connecting member and a first end in some other embodiments of the present application;

[0061] FIG11 is a perspective view of a connecting member, a first wall, an electrode terminal, and an insulating member in some other embodiments of the present application;

[0062] FIG12 is a perspective view of a connecting member in some other embodiments of the present application;

[0063] FIG13 is a cross-sectional view of a connecting member, a first wall, an electrode terminal, and an insulating member in some other embodiments of the present application;

[0064] FIG14 is an enlarged view of point C in FIG13 .

[0065] Icons: 10-battery cell; 11-shell; 110-shell; 111-end cover; 112-first wall; 1120-first through hole; 1121-first surface; 1122-second surface; 12-electrode terminal; 120-first end; 121-liquid injection hole; 122-first groove; 1220-first part; 1221-second part; 123-second end; 13-insulating member; 14-connecting member; 140-second groove; 141-third groove; 142-flange; 16-electrode assembly; x-first direction; y-second direction; 1000-vehicle; 100-battery; 200-controller; 300-motor; 30-case; 31-upper case; 32-lower case. DETAILED DESCRIPTION

[0066] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0067] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0068] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0069] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0070] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0071] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0072] In this application, battery cells may include lithium-ion battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, and the embodiments of this application are not limited thereto. Battery cells may be cylindrical, flat, rectangular, or in other shapes, and the embodiments of this application are not limited thereto.

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

[0074] A battery cell includes a housing, an electrode assembly, and an electrolyte. The electrode assembly is located within the housing. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The uncoated positive current collector protrudes from the coated current collector, serving as the positive tab. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The uncoated negative current collector protrudes from the coated negative current collector, serving as the negative tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). The separator provides electronic insulation, separating the adjacent positive and negative electrodes to prevent short circuits. The separator has numerous micropores that allow electrolyte ions to pass freely, providing excellent permeability to lithium ions.

[0075] The battery cell also includes electrode terminals, which are used to connect to the tabs to enable external charging and discharging of the battery cell. The housing includes a first wall, which is provided with a first through-hole, into which the electrode terminal is mounted. An insulating member is provided between the first wall and the electrode terminal to insulate the first wall and isolate the electrode terminal, thereby reducing the risk of short circuiting the battery cell.

[0076] The development of battery technology must consider multiple design factors at the same time, such as battery life, energy density, discharge capacity, charge and discharge rate and other performance parameters. In addition, the reliability of the battery also needs to be considered. At present, one end of the electrode terminal is bent outward to form an outward-expanding flange to constrain the electrode terminal and limit the movement of the electrode terminal along the thickness direction of the first wall so that the electrode terminal is installed in the first through hole. However, the force generated in the process of bending the end of the electrode terminal outward to form the flange will act on the insulating part between the electrode terminal and the outer shell, causing damage to the insulating part, affecting the insulation of the insulating part, thereby increasing the risk of short circuit of the battery cell, and further affecting the reliability of the battery.

[0077] In view of this, to address the issue of damaging the insulating member due to the flanging of the electrode terminal, thereby affecting battery reliability, some embodiments of the present application provide a battery cell comprising a housing, an electrode terminal, and an insulating member. The housing has a first wall, and the electrode terminal is disposed in a first through-hole in the first wall. The insulating member connects the electrode terminal and the first wall. Along the thickness direction of the first wall, the projection of a first end of the electrode terminal in the thickness direction of the first wall does not overlap with the projection of the insulating member.

[0078] In the above scheme, on the one hand, the electrode terminal and the first wall are connected by an insulating member so that the electrode terminal can be fixed to the first wall. On the other hand, the shape of the electrode terminal is limited so that the projection of the first end of the electrode terminal does not overlap with the projection of the insulating member, that is, the flange on the first end of the electrode terminal is eliminated, thereby reducing the risk of damage to the insulating member due to interference with the insulating member during the process of bending the end of the electrode terminal outward to form a flange, thereby effectively improving the insulation of the insulating member, reducing the risk of short circuit of the battery cell, and thus improving the reliability of the battery.

[0079] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0080] Electrically powered devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0081] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0082] Please refer to Figure 1, which is a schematic diagram of a vehicle 1000 in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0083] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0084] Please refer to Figure 2, which is a perspective exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 30 and a battery cell 10, with the battery cell 10 housed within the housing 30. The housing 30 is used to provide a storage space for the battery cell 10 and can have various structures. In some embodiments, the housing 30 can include an upper housing 31 and a lower housing 32, with the upper housing 31 and the lower housing 32 overlapping each other, and together defining a storage space for the battery cell 10. The lower housing 32 can be a hollow structure with one end open, and the upper housing 31 can be a plate-like structure, with the upper housing 31 overlapping the open side of the lower housing 32, so that the upper housing 31 and the lower housing 32 jointly define a storage space. Alternatively, the upper housing 31 and the lower housing 32 can each be a hollow structure with one end open, with the open side of the upper housing 31 overlapping the open side of the lower housing 32. Of course, the box body 30 formed by the upper box body 31 and the lower box body 32 can be in various shapes, such as a cylinder, a cuboid, etc.

[0085] In the battery 100, there may be multiple battery cells 10, and the multiple battery cells 10 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 10. The multiple battery cells 10 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 10 may be housed within the housing 30. Of course, the battery 100 may also be formed by first connecting multiple battery cells 10 in series, in parallel, or in a hybrid connection to form a battery module, and then the multiple battery modules may be connected in series, in parallel, or in a hybrid connection to form an entire battery cell, and then housed within the housing 30. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for electrically connecting the multiple battery cells 10.

[0086] Each battery cell 10 may be a secondary battery cell or a primary battery cell; it may also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 10 may be cylindrical, flat, rectangular, or in other shapes.

[0087] According to some embodiments of the present application, please refer to Figures 3 to 5. Figure 3 is a three-dimensional exploded view of the battery cell 10 in some embodiments of the present application, Figure 4 is a cross-sectional view of the first wall 112, the electrode terminal 12 and the insulating member 13 in some embodiments of the present application, and Figure 5 is an enlarged view of point A in Figure 4.

[0088] The battery cell 10 includes a housing 11, an electrode terminal 12, and an insulating member 13. The housing 11 has a first wall 112, which defines a first through-hole 1120. The electrode terminal 12 is disposed in the first through-hole 1120 and has a first end 120 along a first direction x, which is parallel to the thickness of the first wall 112. At least a portion of the insulating member 13 is disposed between the electrode terminal 12 and the wall of the first through-hole 1120, connecting the electrode terminal 12 and the first wall 112. The projection of the first end 120 along the first direction x does not overlap with the projection of the insulating member 13.

[0089] The housing 11 is a component for accommodating the electrode assembly 16 of the battery cell 10 . That is, the electrode assembly 16 is disposed inside the housing 11 .

[0090] The material of the shell 11 can be aluminum, aluminum alloy or steel. The shell 11 can be cylindrical, flat, rectangular or other shapes. In some embodiments, the shell 11 may include a shell 110 and an end cover 111. The shell 110 is a hollow structure and has an opening. The electrode assembly 16 is arranged inside the shell 110. The end cover 111 closes the opening of the shell 110, and the end cover 111 can be connected to the shell 110 by welding, riveting or other connection methods. The first wall 112 is one of the wall portions of the shell 11. In some embodiments, the first wall 112 can be the end cover 111 described above. The first direction x can be the thickness direction of the first wall 112.

[0091] The first through hole 1120 is a hole-shaped structure formed in the first wall 112. The first through hole 1120 can accommodate the electrode terminal 12 so that part of the electrode terminal 12 is located inside the outer shell 11 to be connected to the electrode tab of the electrode assembly, and part of the electrode terminal 12 is exposed to the outside to be connected to the external component to realize external charging and discharging of the battery cell 10.

[0092] The electrode terminal 12 is a component disposed on the first wall 112 and partially located within the first through-hole 1120. One end of the electrode terminal 12 is used to connect to the tab of the electrode assembly, and the other end is connected to an external component to enable external charging and discharging of the battery cell 10. In some embodiments, the outer contour of the projection of the electrode terminal 12 in the first direction x can be circular, square, or other shapes. In some embodiments of the present application, the outer contour of the projection of the electrode terminal 12 in the first direction x is circular as an example.

[0093] In some embodiments, the first direction x can be parallel to the axial direction of the first through hole 1120. The first end 120 is the end of the electrode terminal 12 in the first direction x. In some embodiments, the first end 120 can be the end of the electrode terminal 12 facing the interior of the housing 11 (i.e., the end connected to the tab). In some embodiments, the first end 120 can be the end of the electrode terminal 12 facing away from the interior of the housing 11.

[0094] The insulating member 13 is a component disposed between the first wall 112 and the electrode terminal 12, and is used to insulate and isolate the electrode terminal 12 from the first wall 112. In some embodiments, the insulating member 13 may be made of plastic, ceramic, or other materials with insulating properties.

[0095] In some embodiments, “at least a portion of the insulating member 13 is disposed between the electrode terminal 12 and the wall of the first through hole 1120 ” can be understood as an insulating member 13 being disposed between the wall of the first through hole 1120 and the electrode terminal 12 to achieve insulation isolation between the electrode terminal 12 and the wall of the first through hole 1120 .

[0096] In some embodiments, "the insulating member 13 is connected to the electrode terminal 12 and the first wall 112" can be understood as the connection between the electrode terminal 12 and the insulating member 13, and the connection between the insulating member 13 and the first wall 112, so that the electrode terminal 12 is mounted on the first wall 112 without being separated from the first through hole 1120. In some embodiments, the insulating member 13 and the first wall 112 can be connected by overlapping, clamping, bonding, thermal bonding, or other connection methods. In some embodiments, the insulating member 13 and the electrode terminal 12 can be connected by bonding, thermal bonding, or other connection methods.

[0097] "Along the first direction x, the projection of the first end 120 does not overlap with the projection of the insulating member 13" can be understood as meaning that the size of the first end 120 is smaller than the size of the first through hole 1120. It can also be understood as meaning that in the second direction y, the first end 120 does not interfere with the insulating member 13. The second direction y is perpendicular to the thickness direction of the first wall 112 and can be parallel to the plane of the surface of the first wall 112.

[0098] In the above scheme, on the one hand, the electrode terminal 12 and the first wall 112 are connected by the insulating member 13, so that the electrode terminal 12 can be fixed to the first wall 112. On the other hand, the shape of the electrode terminal 12 is limited so that the projection of the first end 120 of the electrode terminal 12 does not overlap with the projection of the insulating member 13, that is, the flange on the first end 120 of the electrode terminal 12 is eliminated, thereby reducing the risk of damage to the insulating member 13 caused by interference with the insulating member 13 during the process of bending the end of the electrode terminal 12 outward to form the flange, thereby effectively improving the insulation of the insulating member 13, reducing the risk of short circuit of the battery cell 10, and thus improving the reliability of the battery.

[0099] According to some embodiments of the present application, the insulating member 13 is thermally composite-connected to the electrode terminal 12 .

[0100] In some embodiments, the insulating member 13 can be connected to the electrode terminal 12 through a thermal bonding process. For example, when the insulating member 13 is plastic, the insulating member 13 can be heated so that the insulating member 13 covers a portion of the circumference of the electrode terminal 12 and is connected to the electrode terminal 12.

[0101] In the above solution, the insulating member 13 is connected to the battery terminal through a thermal composite process, which can reduce the difficulty of connecting the electrode terminal 12 and the insulating member 13, improve the manufacturing efficiency of the battery, and enable the electrode terminal 12 to be stably installed in the first through hole 1120.

[0102] According to some embodiments of the present application, along the first direction x, the first end 120 is an end of the electrode terminal 12 away from the interior of the housing 11 .

[0103] In some embodiments, along the first direction x, the end of the electrode terminal 12 away from the electrode assembly 16 is the first end 120. In some embodiments, the first end 120 can be used to connect to an external component to enable external charging and discharging of the battery cell 10.

[0104] In the above solution, the first end 120 is the end of the electrode terminal 12 located outside the outer shell 11, that is, the end of the electrode terminal 12 away from the inside of the outer shell 11 may not form a flange, thereby reducing the risk of damage to the part of the insulating member 13 outside the outer shell 11 due to interference from the flange, thereby improving the reliability of the battery.

[0105] In some other embodiments, the first wall 112 may also be an end of the electrode terminal 12 facing the electrode assembly.

[0106] According to some embodiments of the present application, referring to FIG5 , along the first direction x, the first wall 112 has a first surface 1121 away from the interior of the housing 11 . Part of the insulating member 13 is disposed on the first surface 1121 .

[0107] In some embodiments, the first surface 1121 may be the outer surface of the first wall 112, that is, the surface of the first wall 112 that is exposed to the outside. The phrase "a portion of the insulating member 13 is disposed on the first surface 1121" can be understood to mean that the insulating member 13 is disposed on the outer surface of the first wall 112. In other words, the insulating member 13 is partially located between the hole wall of the first through-hole 1120 and the electrode terminal 12, and is located on the outer surface of the first wall 112.

[0108] In some embodiments, the portion of the insulating member 13 disposed on the first surface 1121 may be connected to the first surface 1121 by bonding or thermal bonding. In some embodiments, the portion of the insulating member 13 disposed on the first surface 1121 may be directly placed on the first surface 1121 .

[0109] In the above scheme, the first surface 1121 can be the outer surface of the first wall 112. By setting part of the insulating part 13 on the first surface 1121, on the one hand, the creepage distance between the electrode terminal 12 and the first wall 112 can be increased, and the insulation effect of the insulating part 13 can be improved; on the other hand, the part of the insulating part 13 set on the first surface 1121 can limit the displacement of the insulating part 13 along the first direction x, reduce the risk of displacement of the insulating part 13, and improve the insulation effect; on the other hand, the part of the insulating part 13 set on the first surface 1121 can be regarded as the insulating part 13 overlapping the first wall 112, so that the electrode terminal 12 is stably installed on the first wall 112.

[0110] According to some embodiments of the present application, please refer to Figures 6-9. Figure 6 is a perspective view of the connector 14, first wall 112, electrode terminal 12, and insulating member 13 in some embodiments of the present application. Figure 7 is a perspective view of the connector 14 in some embodiments of the present application. Figure 8 is a cross-sectional view of the connector 14, first wall 112, electrode terminal 12, and insulating member 13 in some embodiments of the present application. Figure 9 is an enlarged view of point B in Figure 8.

[0111] The battery cell 10 further includes a connector 14 . The connector 14 is located on a side of the first wall 112 away from the interior of the housing 11 . The connector 14 is connected to the first end 120 and is used to restrict the electrode terminal 12 from moving along the first direction x.

[0112] In some embodiments, the connector 14 is located outside the housing 11 and is connected to the first end 120 to constrain the electrode terminal 12 along the first direction x and limit the displacement of the electrode terminal 12 .

[0113] In some embodiments, the connector 14 can be connected to the first end 120 by bonding, welding, screw connection, thermal composite connection, or other connection methods. The material of the connector 14 can be the same as or different from the material of the electrode terminal 12. In some embodiments, the material of the connector 14 can be a metal material or a non-metal material.

[0114] In some embodiments, the connector 14 can limit the displacement of the electrode terminal 12 along the first direction x from the outside of the housing 11 toward the inside of the housing 11 .

[0115] In the above scheme, by providing a connector 14 and positioning the connector 14 on the outside of the first wall 112, the flange of the current electrode terminal 12 can be replaced. On the one hand, this does not interfere with the insulating member 13, thereby reducing the risk of damage and failure of the insulating member 13. On the other hand, it can effectively constrain the electrode terminal 12, restricting the movement of the electrode terminal 12 along the first direction x, thereby reducing the risk of the electrode terminal 12 falling off and improving the reliability of the battery.

[0116] According to some embodiments of the present application, referring to FIG. 9 , along the first direction x, a portion of the insulating member 13 disposed on the first surface 1121 is located between the connecting member 14 and the first wall 112 .

[0117] In some embodiments, the connector 14 is connected to the first end 120 and can provide pressure to the portion of the insulating member 13 disposed on the first surface 1121 so that the portion of the insulating member 13 disposed on the first surface 1121 is in close contact with the first surface 1121 .

[0118] In some embodiments, the connector 14 may be made of a conductive material, and a portion of the insulating member 13 is located between the connector 14 and the first wall 112 to insulate and isolate the connector 14 from the first wall 112 .

[0119] In some embodiments, referring to FIG9 , along the second direction y (the second direction y may be perpendicular to the first direction x and may be parallel to the first surface 1121), the portion of the insulating member 13 disposed on the first surface 1121 extends beyond the connector 14. In other embodiments, along the second direction y, the portion of the insulating member 13 disposed on the first surface 1121 does not extend beyond the connector 14.

[0120] In the above solution, the insulating member 13 is partially located between the connector 14 and the first wall 112. On the one hand, the insulating member 13 can be constrained by the connector 14 and the first wall 112, so that it can be stably installed on the first wall 112, reducing the risk of displacement of the insulating member 13, reducing the risk of short circuiting of the battery cell 10, and improving the reliability of the battery. On the other hand, when the connector 14 has conductive properties, the insulating member 13 insulates the connector 14 from the first wall 112, reducing the risk of short circuiting of the battery cell 10.

[0121] In some other embodiments, a portion of the insulating member 13 disposed on the first surface 1121 is formed with a notch, and the connecting member 14 can be located in the notch so that the portion of the connecting member 14 facing the first surface 1121 can be connected to the first surface 1121 .

[0122] According to some embodiments of the present application, along the first direction x, the first end 120 extends beyond the first surface 1121 , and the connector 14 is connected to at least a portion of the circumference of the electrode terminal 12 extending beyond the first surface 1121 ; or, the connector 14 is connected to the end surface of the first end 120 .

[0123] Referring to Figure 9 , the circumference of the electrode terminal 12 can be understood as comprising two end surfaces in the thickness direction of the first wall 112, the two end surfaces being connected by the circumference. Referring to Figure 9 , along a first direction x, and from the interior of the housing 11 toward the exterior of the housing 11, the first end 120 extends beyond the first surface 1121, and at least a portion of the circumference of the portion of the first end 120 extending beyond the first surface 1121 can be connected to the connector 14. The phrase "at least a portion of the circumference of the portion of the first end 120 extending beyond the first surface 1121 can be connected to the connector 14" can be understood as meaning that the circumference of the portion of the first end 120 extending beyond the first surface 1121 is connected to the connector 14, or, in some embodiments, the circumference of the portion of the first end 120 extending beyond the insulating member 13 disposed on the first surface 1121 is connected to the connector 14.

[0124] Please refer to Figure 10, which is a schematic diagram of the connector 14 and the first end 120 in other embodiments of the present application. The connector 14 is connected to the end surface of the first end 120. The end surface of the first end 120 can refer to the end surface of the electrode terminal 12 that is away from the interior of the housing 11. Referring to Figure 10, along the first direction x, and from the interior of the housing 11 to the exterior of the housing 11, the first end 120 does not extend beyond the first surface 1121, and the end surface of the first end 120 is flush with the first surface 1121.

[0125] The above solution, by arranging the connecting member 14 on the circumferential surface and / or end surface of the first end 120, can ensure a stable connection relationship between the connecting member 14 and the first end 120, effectively constrain the electrode terminal 12, reduce the risk of displacement of the electrode terminal 12, and improve the reliability of the battery.

[0126] According to some embodiments of the present application, referring to FIG. 6 , the connecting member 14 is ring-shaped and is disposed around the first end 120 .

[0127] "Connector 14 is annular" may refer to a hollow, through-hole structure. In some embodiments, the projection of first end 120 in the first direction x may have a circular outer contour, and connector 14 may have a circular annular shape. In some embodiments, the projection of first end 120 in the first direction x may have a square outer contour, and connector 14 may have a square annular shape.

[0128] “The connecting member 14 is disposed around the first end 120 ” can be understood as any portion of the first end 120 is connected to the connecting member 14 in the circumferential direction of the first end 120 .

[0129] In the above scheme, by setting the connecting member 14 to be ring-shaped, on the one hand, the connecting member 14 can be arranged along the circumference of the electrode terminal 12 to be connected to the electrode terminal 12 in the circumferential direction of the electrode terminal 12, thereby effectively constraining the electrode terminal 12, reducing the risk of displacement of the electrode terminal 12, and improving the reliability of the battery; on the other hand, the inner ring of the connecting member 14 can expose the middle part of the electrode terminal 12, so that the electrode terminal 12 can be connected to an external component to realize external charging and discharging.

[0130] According to some embodiments of the present application, along the first direction x, the electrode terminal 12 is provided with a liquid injection hole 121 , and the liquid injection hole 121 passes through the electrode terminal 12 and communicates with the interior of the housing 11 .

[0131] The injection hole 121 is a through-hole structure formed in the electrode terminal 12. It can connect the interior and exterior of the housing 11, allowing electrolyte to be injected into the interior of the housing 11 through the injection hole 121. In some embodiments, the injection hole 121 can be sealed with a sealing nail. The sealing nail can be a non-metallic nail, such as a rubber nail, or a metal nail, such as an aluminum nail.

[0132] In the above solution, by integrating the injection hole 121 into the electrode terminal 12, the structural strength of the first wall 112 can be improved compared to the solution of providing the injection hole 121 on the first wall 112, thereby improving the structural strength of the outer shell 11 and reducing the risk of electrolyte leakage due to damage to the outer shell 11, thereby making the battery more reliable.

[0133] According to other embodiments of the present application, please refer to Figures 11-14. Figure 11 is a perspective view of the connector 14, first wall 112, electrode terminal 12, and insulating member 13 in other embodiments of the present application. Figure 12 is a perspective view of the connector 14 in other embodiments of the present application. Figure 13 is a cross-sectional view of the connector 14, first wall 112, electrode terminal 12, and insulating member 13 in other embodiments of the present application. Figure 14 is an enlarged view of point C in Figure 13.

[0134] The connecting member 14 closes the liquid injection hole 121 .

[0135] In some embodiments, the injection hole 121 can be sealed with a sealing pin. After the sealing pin is sealed, the connector 14 is connected to the first end 120 to re-seal the injection hole 121. In some embodiments, after the electrolyte is injected into the interior of the housing 11, the connector 14 is connected to the first end 120 to seal the injection hole 121.

[0136] In the above scheme, by providing the connector 14 and the connector 14 closing the injection hole 121, on the one hand, the connector 14 can replace the flange of the current electrode terminal 12, and effectively constrain the electrode terminal 12 without interfering with the insulating member 13, limiting the movement of the electrode terminal 12 along the first direction x, reducing the risk of the electrode terminal 12 falling off, and improving the reliability of the battery; on the other hand, the connector 14 can replace the sealing nail of the current battery or protect the injection hole 121 again to reduce the risk of electrolyte leakage.

[0137] According to some embodiments of the present application, along the first direction x, the projection of the connecting member 14 covers the projection of the first end 120 .

[0138] The phrase "along the first direction x, the projection of the connector 14 covers the projection of the first end 120" can be understood to mean that the connector 14 can cover the first end 120 to limit displacement of the electrode terminal 12 on the first direction and to close the injection hole 121. It can also be understood that the connector 14 can be disc-shaped or plate-shaped to cover any portion of the first end 120.

[0139] In the above scheme, by limiting the projection of the connecting member 14 to cover the projection of the first end 120, on the one hand, the connecting member 14 can have a larger effective area on the electrode terminal 12, so as to effectively constrain the electrode terminal 12 and reduce the risk of displacement of the electrode terminal 12. On the other hand, the connecting member 14 can effectively close the injection hole 121, reduce the risk of electrolyte leakage, and make the battery have higher reliability.

[0140] According to some embodiments of the present application, referring to FIG. 14 , a first groove 122 is formed on the end surface of the first end 120 , and the injection hole 121 is located at the bottom of the first groove 122 .

[0141] In some embodiments, the end surface of the first end 120 is recessed toward the interior of the housing 11 to form a first groove 122. The bottom of the first groove 122 may be located along the first direction x, and the first groove 122 may be close to the interior of the housing 11.

[0142] In the above scheme, by providing the first groove 122 on the end surface of the first end 120, an injection hole 121 can be formed at the bottom of the first groove 122. On the one hand, the injection hole 121 can be made lower than the end surface of the first end 120, thereby reducing the risk of electrolyte leakage from the injection hole 121; on the other hand, by grooves being formed on the end surface of the first end 120, the weight of the electrode terminal 12 can be reduced, thereby improving the weight energy density of the battery.

[0143] According to some embodiments of the present application, along the first direction x, a second groove 140 is formed on the surface of the connector 14 facing the electrode terminal 12 . The first end 120 is disposed in the second groove 140 , and a portion of the connector 14 is located in the first groove 122 .

[0144] In some embodiments, the second groove 140 can be annular to correspond to the annular first end 120. "The first end 120 is disposed in the second groove 140" can mean that, when the connector 14 is connected to the first end 120, a portion of the first end 120 is located in the second groove 140. "A portion of the connector 14 is located in the first groove 122" can be understood as meaning that the portion of the connector 14 facing the first groove 122 protrudes from the bottom of the second groove 140 to be located in the first groove 122. In some embodiments, the portion of the connector 14 protruding toward the first groove 122 contacts the sidewalls of the first groove 122.

[0145] In some embodiments, along the first direction x, the first end 120 extends beyond the first surface 1121 , and a portion of the first end 120 extending beyond the first surface 1121 is disposed in the second groove 140 .

[0146] Referring to FIG. 14 , in some embodiments, the first groove 122 is a stepped groove having a larger first portion 1220 and a smaller second portion 1221. The first portion 1220 is farther from the interior of the housing 11 than the second portion 1221, and the bottom of the first groove 122 is located at the second portion 1221. The portion of the connector 14 that protrudes into the first groove 122 is located in the first portion 1220.

[0147] In the above scheme, by setting the second groove 140, the connector 14 can be effectively connected to the first end 120, and part of the connector 14 can be located in the first groove 122. On the one hand, the center of gravity of the connector 14 is lowered, the connection stability between the connector 14 and the first end 120 is improved, and the risk of the electrode terminal 12 falling off is reduced; on the other hand, by setting part of the connector 14 in the first groove 122, the space of the first groove 122 can be effectively utilized, saving the space occupied by the connector 14 in the first direction x, and improving the volume energy density of the battery cell 10.

[0148] According to some embodiments of the present application, along the first direction x, a third groove 141 is formed on a surface of the connector 14 away from the electrode terminal 12 , and the second groove 140 and the third groove 141 are correspondingly arranged.

[0149] The surface of the connector 14 away from the electrode terminal 12 may be the outer surface of the connector 14 . That is, the third groove 141 is formed on the outer surface of the connector 14 , and the second groove 140 is formed on the inner surface of the connector 14 .

[0150] The third groove 141 is a groove-like structure formed on the outer surface of the connector 14 and is disposed correspondingly to the second groove 140. The phrase "the second groove 140 and the third groove 141 are disposed correspondingly" can be understood as meaning that, in a plane perpendicular to the first direction, the second groove 140 and the third groove 141 are located at the same position, or that, along the first direction x, the projections of the second groove 140 and the third groove 141 are located at the same position.

[0151] In the above scheme, by setting the third groove 141 on the outer surface of the connecting member 14, on the one hand, a gripping position can be provided for a robot or a worker to grip the connecting member 14. On the other hand, the third groove 141 is set corresponding to the second groove 140, so that the position of the second groove 140 can be determined on the outside of the connecting member 14, so as to accurately align the second groove 140 with the first end 120, thereby improving installation efficiency.

[0152] According to some embodiments of the present application, referring to FIG. 14 , a flange 142 is provided on the circumference of the connecting member 14 , and the flange 142 is connected to a portion of the insulating member 13 provided on the first surface 1121 .

[0153] In some embodiments, the flange 142 is a component that protrudes from the circumference of the connector 14. Along the second direction y, the flange 142 protrudes from the circumference of the connector 14. In some embodiments, along the first direction x, the size of the flange 142 is smaller than the size of the connector 14.

[0154] The flange 142 is connected to the portion of the insulating member 13 disposed on the first surface 1121. This connection can be such that, along the second direction y, the portion of the insulating member 13 disposed on the first surface 1121 extends beyond the flange 142, or the portion of the insulating member 13 disposed on the first surface 1121 is flush with the flange 142. The flange 142 can be connected to the insulating member 13 by adhesive bonding, thermal bonding, or other methods. In some embodiments, the flange 142 can be placed directly on the insulating member 13.

[0155] In the above solution, by providing the flange 142 and connecting the flange 142 to a portion of the insulating member 13 , a seal can be formed between the protrusion and the insulating member 13 , thereby reducing the risk of electrolyte leakage.

[0156] According to some embodiments of the present application, the connecting member 14 is welded to the first end 120 .

[0157] In some embodiments, the connector 14 may be laser welded to the circumference of the first end 120. In some embodiments, the connector 14 may be laser welded to the end surface of the first end 120.

[0158] In some embodiments, the material of the connector 14 can be the same as the material of the first end 120. In some embodiments, the material of the connector 14 can be different from the material of the first end 120.

[0159] In the above solution, the connector 14 is welded to the first end 120, which enables a stable connection between the connector 14 and the first end 120, so that the connector 14 can effectively constrain the electrode terminal 12, reduce the risk of displacement of the electrode terminal 12, and improve the reliability of the battery.

[0160] According to some embodiments of the present application, the connecting member 14 is a metal member.

[0161] In some embodiments, the connector 14 may be a metal member, such as aluminum, an aluminum alloy, or the like. In some embodiments, the connector 14 may be made of the same material as the electrode terminal 12 to effectively connect to the electrode terminal 12. In some embodiments, when the connector 14 is a metal member and covers the first end 120, the external component may be electrically connected to the electrode terminal 12 by being electrically connected to the connector 14.

[0162] In some embodiments, the connector 14 may be made of an insulating material. When the connector 14 is made of an insulating material, it can replace the insulating member 13 disposed on the first surface 1121 to insulate the first surface 1121 from the electrode terminal 12 .

[0163] In the above solution, when the connector 14 is made of metal, it has high structural strength and can effectively restrain the electrode assembly, thereby extending the service life of the battery cell 10. When the connector 14 is made of an insulating material, it can increase the creepage distance between the electrode terminal 12 and the housing 11, reduce the risk of short circuiting the battery cell 10, and improve the reliability of the battery.

[0164] According to some embodiments of the present application, referring to FIG. 4 , the electrode terminal 12 has a second end 123. Along the first direction x, the second end 123 is disposed opposite the first end 120, and the second end 123 is located on a side of the first wall 112 away from the first end 120. Along the first direction x, the projection of the second end 123 partially overlaps with the projection of the first wall 112.

[0165] In the first direction x, the second end 123 is disposed opposite the first end 120. When the first end 120 faces away from the electrode assembly, the second end 123 may face the electrode terminal 12. "The second end 123 is located on a side of the first wall 112 away from the first end 120" may mean that when the first end 120 faces away from the electrode assembly, the second end 123 may be located inside the housing 11.

[0166] The phrase "along the first direction x, the projection of the second end 123 partially overlaps the projection of the first wall 112" can be understood as meaning that the second end 123 is larger than the first through hole 1120, so that it can act on the first wall 112 and constrain the electrode terminal 12. For example, when the second end 123 is inside the housing 11, it can restrict the electrode terminal 12 from moving outward from the interior of the housing 11.

[0167] In the above scheme, by setting the projection of the second end 123 to partially overlap with the projection of the first wall 112, the second end 123 can act on the side of the first wall 112 away from the first end 120 to limit the displacement of the electrode terminal 12 along the first direction x, thereby reducing the risk of the electrode terminal 12 falling off and improving the reliability of the battery.

[0168] In other embodiments, the projection of the second end 123 along the first direction x may not overlap with the projection of the first wall 112, that is, the size of the second end 123 is smaller than the size of the first through hole 1120. By providing a connecting member at the second end 123, the electrode terminal 12 is constrained to limit displacement of the electrode terminal 12.

[0169] According to some embodiments of the present application, referring to FIG. 4 , a portion of the insulating member 13 is located between the first wall 112 and the second end 123 .

[0170] “Part of the insulating member 13 is located between the first wall 112 and the second end 123 ” can be understood as the first wall 112 and the second end 123 being insulated and isolated by the insulating member 13 .

[0171] In some embodiments, first wall 112 has a second surface 1122. Along the first direction, second surface 1122 is disposed opposite first surface 1121. When first surface 1121 is the outer surface of first wall 112, second surface 1122 may be the inner surface of first wall 112. A portion of insulating member 13 may be disposed between second surface 1122 and second end 123.

[0172] In the above solution, by partially arranging the insulating member 13 between the first wall 112 and the second end 123, the second end 123 and the shell 11 can be effectively insulated and isolated, reducing the risk of the battery cell 10 short-circuiting due to the overlap of the electrode terminal 12 and the shell 11, thereby improving the reliability of the battery.

[0173] According to some embodiments of the present application, a battery is further provided, comprising the battery cell 10 provided above.

[0174] According to some embodiments of the present application, an electric device is further provided. The electric device includes the battery cell 10 provided above, and the battery cell 10 is used to provide electric energy.

[0175] According to some embodiments of the present application, the present application provides a battery cell 10 , please refer to FIG. 3 to FIG. 9 .

[0176] The battery cell 10 includes a housing 11 , electrode terminals 12 , an insulating member 13 , and a connector 14 .

[0177] The housing 11 has a first wall 112 with a first through-hole 1120. The electrode terminal 12 is disposed in the first through-hole 1120 and has a first end 120 and a second end 123 opposite each other along a first direction x, parallel to the thickness of the first wall 112. A portion of the first end 120 is located within the first through-hole 1120 and extends beyond the outer surface of the first wall 112. The second end 123 is located within the housing 11 and is larger than the first through-hole 1120, thereby preventing the electrode terminal 12 from being dislodged from the interior of the housing 11.

[0178] A portion of the insulating member 13 is disposed between the electrode terminal 12 and the wall of the first through hole 1120, a portion of the insulating member 13 is disposed on the outer surface of the first wall 112, and another portion of the insulating member 13 is disposed on the inner surface of the first wall 112 and is located between the first wall 112 and the second end 123. The insulating member 13 is thermally bonded to the electrode terminal 12.

[0179] The connecting member 14 is annular and is arranged axially around the first end 120. The inner annular wall surface of the connecting member 14 is welded to the circumference of the insulating member 13 provided on the outer surface of the first wall 112, which extends beyond the first end 120. The insulating member 13 provided on the outer surface of the first wall 112 is located between the connecting member 14 and the first wall 112. The connecting member 14 is capable of limiting the displacement of the electrode terminal 12 along the first direction x. When assembling the electrode terminal 12, the first end 120 of the electrode terminal 12 can be moved outward from the side of the first wall 112 close to the inside of the shell 11 to pass through the first through hole 1120 and then connect with the connecting member 14. Since the first end 120 does not form a flange, it will not interfere with the insulating member 13, thereby reducing the risk of damage to the insulating member 13.

[0180] According to other embodiments of the present application, the present application provides a battery cell 10 , please refer to FIG. 11 to FIG. 14 .

[0181] The battery cell 10 includes a housing 11 , electrode terminals 12 , an insulating member 13 , and a connector 14 .

[0182] The outer shell 11 has a first wall 112, and the first wall 112 has a first through hole 1120. The electrode terminal 12 is arranged in the first through hole 1120. Along the first direction x, the electrode terminal 12 has a first end 120 and a second end 123 opposite to each other. The first direction x is parallel to the thickness direction of the first wall 112. Part of the first end 120 is located in the first through hole 1120, and part of the first end 120 protrudes from the outer surface of the first wall 112. A first groove 122 is formed on the end surface of the first end 120, and a liquid injection hole 121 is provided at the bottom of the first groove 122. The liquid injection hole 121 is sealed by a sealing nail. The second end 123 is located inside the outer shell 11, and the size of the second end 123 is larger than the size of the first through hole 1120 to prevent the electrode terminal 12 from escaping from the inside of the outer shell 11 to the outside.

[0183] A portion of the insulating member 13 is disposed between the electrode terminal 12 and the wall of the first through hole 1120, a portion of the insulating member 13 is disposed on the outer surface of the first wall 112, and another portion of the insulating member 13 is disposed on the inner surface of the first wall 112 and is located between the first wall 112 and the second end 123. The insulating member 13 is thermally bonded to the electrode terminal 12.

[0184] The connector 14 is disc-shaped, and a second groove 140 is formed on the surface of the connector 14 facing the electrode terminal 12. The first end 120 is disposed in the second groove 140, and the side wall of the second groove 140 can be welded to the first end 120. A third groove 141 is formed on the surface of the connector 14 away from the electrode terminal 12. The third groove 141 is disposed corresponding to the second groove 140 and can play a positioning role. The insulating member 13 disposed on the outer surface of the first wall 112 is located between the connector 14 and the first wall 112. In some embodiments, a flange 142 is provided on the circumference of the connector 14, and the flange 142 is thermally composited with a portion of the insulating member 13 disposed on the outer surface of the first wall 112 to form a seal to reduce the risk of electrolyte leakage. The connector 14 can limit the displacement of the electrode terminal 12 along the first direction x. When assembling the electrode terminal 12, the first end 120 of the electrode terminal 12 can be moved outward from the side of the first wall 112 close to the inside of the shell 11 to pass through the first through hole 1120 and then connect with the connecting member 14. Since the first end 120 does not form a flange, it will not interfere with the insulating member 13, reducing the risk of damage to the insulating member 13.

[0185] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, wherein: include: A housing having a first wall, wherein the first wall has a first through hole; An electrode terminal is disposed in the first through hole, and has a first end along a first direction, wherein the first direction is parallel to a thickness direction of the first wall; an insulating member, at least partially disposed between the electrode terminal and the hole wall of the first through hole, and the insulating member connects the electrode terminal and the first wall; Along the first direction, a projection of the first end does not overlap with a projection of the insulating member.

2. The battery cell according to claim 1, wherein: The insulating member is thermally composite-connected to the electrode terminal.

3. The battery cell according to claim 1 or 2, wherein: Along the first direction, the first end is an end of the electrode terminal away from the interior of the housing.

4. The battery cell according to claim 3, wherein: The first wall has a first surface facing away from the interior of the housing along the first direction; A portion of the insulating element is disposed on the first surface.

5. The battery cell according to claim 4, wherein: The battery cell further comprises: A connecting member is located on a side of the first wall away from the interior of the housing, and the connecting member is connected to the first end to limit the movement of the electrode terminal along the first direction.

6. The battery cell according to claim 5, wherein: Along the first direction, a portion of the insulating member disposed on the first surface is located between the connecting member and the first wall.

7. The battery cell according to claim 5, wherein: Along the first direction, the first end protrudes from the first surface, and the connecting member is connected to at least a portion of the circumference of the portion of the first end protruding from the first surface; or, the connecting member is connected to an end surface of the first end.

8. The battery cell according to any one of claims 5 to 7, wherein: The connecting member is ring-shaped and is disposed around the first end.

9. The battery cell according to any one of claims 5 to 8, wherein: Along the first direction, the electrode terminal is provided with a liquid injection hole, and the liquid injection hole penetrates the electrode terminal and communicates with the interior of the housing.

10. The battery cell according to claim 9, wherein: The connecting piece closes the liquid injection hole.

11. The battery cell according to claim 10, wherein: Along the first direction, a projection of the connecting member covers a projection of the first end.

12. The battery cell according to claim 10 or 11, wherein: A first groove is formed on the end surface of the first end, and the injection hole is located at the bottom of the first groove.

13. The battery cell according to claim 12, wherein: A second groove is formed on a surface of the connection member facing the electrode terminal along the first direction, the first end is disposed in the second groove, and a portion of the connection member is located in the first groove.

14. The battery cell according to claim 13, wherein: A third groove is formed on a surface of the connection member away from the electrode terminal along the first direction, and the second groove and the third groove are arranged correspondingly.

15. The battery cell according to any one of claims 9 to 14, wherein: A flange is arranged on the peripheral surface of the connecting member, and the flange is connected to a portion of the insulating member arranged on the first surface.

16. The battery cell according to any one of claims 5 to 15, wherein: The connecting member is welded to the first end.

17. The battery cell according to any one of claims 5 to 16, wherein: The connecting piece is a metal piece.

18. The battery cell according to any one of claims 1 to 17, wherein: The electrode terminal has a second end, and along the first direction, the second end is arranged opposite to the first end, and the second end is located on a side of the first wall away from the first end; Along the first direction, a projection of the second end partially overlaps with a projection of the first wall.

19. The battery cell according to claim 18, wherein: A portion of the insulator is located between the first wall and the second end.

20. A battery, wherein: A battery cell comprising the battery cell according to any one of claims 1 to 19.

21. An electrical device, wherein: The battery cell comprises the battery cell according to any one of claims 1 to 19, wherein the battery cell is used to provide electrical energy.

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