Battery cell, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device, the battery monomer comprises a shell and a connecting terminal, and the shell is provided with a mounting hole; and the connecting terminals are at least partially arranged in the mounting holes, are insulated from the shell, and are used for information interaction between the interior and the exterior of the battery monomer. According to the battery monomer provided by the invention, information interaction between the inside and the outside of the battery monomer can be realized, so that information such as working conditions inside the battery monomer can be transmitted to the outside of the battery monomer, or information such as control signals outside the battery monomer can be transmitted to the inside of the battery monomer; information interaction between related components inside the battery monomer and related components outside the battery monomer is facilitated, so that normal work of the battery monomer is ensured, and the safety performance of the battery monomer is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more specifically, to a battery cell, a battery, and an electrical device. Background Art

[0002] Batteries are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc. Battery cells can include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.

[0003] In the development of battery cell technology, in addition to improving the performance of battery cells, safety is also an issue that cannot be ignored. Therefore, how to improve the safety performance of battery cells is a technical issue that needs to be continuously improved in battery cell technology. Summary of the invention

[0004] The present application provides a battery cell, a battery, and an electrical device, which are beneficial to improving the safety performance of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell including a shell and a connecting terminal, wherein the shell has a mounting hole; the connecting terminal is at least partially disposed in the mounting hole and is insulated from the shell, and the connecting terminal is used for information exchange between the inside and outside of the battery cell.

[0006] The battery cell provided in the embodiment of the present application can realize information exchange between the inside and outside of the battery cell by providing an outer shell with a mounting hole and at least partially disposing the connecting terminal in the mounting hole, so as to transmit information such as the working condition inside the battery cell to the outside of the battery cell, or transmit information such as the control signal outside the battery cell to the inside of the battery cell, so as to facilitate information exchange between related components inside the battery cell and related components outside the battery cell, so as to ensure the normal operation of the battery cell, which is beneficial to improving the safety performance of the battery cell.

[0007] In some embodiments, a plurality of mounting holes are arranged at intervals, and a connecting terminal is arranged in each mounting hole.

[0008] Such an arrangement facilitates the information transmission between the inside and outside of the battery cell, and facilitates the function of simultaneously transmitting multiple types of information between the inside and outside of the battery cell.

[0009] In some embodiments, the battery cell further includes an insulating member, which is at least partially disposed between the connecting terminal and an inner wall of the mounting hole.

[0010] In this way, mutual insulation between the connecting terminal and the housing can be achieved, so that the connecting terminal can transmit information more accurately and quickly.

[0011] In some embodiments, one of the connection terminal and the insulating member is formed with a groove, and the other is formed with a protrusion, and the groove and the protrusion cooperate with each other. Through the cooperation of the groove and the protrusion, the connection terminal and the insulating member are limited, reducing the risk of mutual movement between the two.

[0012] In some embodiments, the peripheral surface of the connecting terminal is formed with an annular protrusion, and the inner wall of the insulating member is formed with an annular groove. In this way, while improving the limiting effect of the protrusion and the groove on the connecting terminal and the insulating member, it is helpful to reduce the difficulty of assembling the connecting terminal and the insulating member.

[0013] In some embodiments, the distance h1 of the protrusion protruding from the peripheral surface of the connecting terminal satisfies: h1 ≥ 0.1 mm. This helps to ensure the area of ​​mutual cooperation between the protrusion and the groove, and helps to ensure the mutual limiting effect between the connecting terminal and the insulating member.

[0014] In some embodiments, the connection terminal is formed with a plurality of protrusions arranged at intervals, and the spacing L between two adjacent protrusions satisfies: L ≥ 0.1 mm. The connection terminal is formed with a plurality of protrusions arranged at intervals, which is conducive to further ensuring the area of ​​the protrusions and the grooves to further ensure the mutual limiting effect of the connection terminal and the insulating member. The spacing L between adjacent protrusions is set to satisfy the above relationship, which is convenient for the processing of the protrusions and the grooves, and is also conducive to further improving the limiting effect of the protrusions and the grooves on the connection terminal and the insulating member.

[0015] In some embodiments, the housing includes a first wall, and the mounting hole is arranged through the first wall. The mounting hole is arranged through the first wall to facilitate the installation of the connecting terminal.

[0016] In some embodiments, the battery cell further includes an electrode terminal disposed on the first wall, the electrode terminal is used to transmit electrical energy, and is spaced apart from the connection terminal. The electrode terminal and the connection terminal are spaced apart to reduce the risk of electrical conduction between the two affecting the normal operation of the battery cell. Moreover, the electrode terminal and the connection terminal are both disposed on the first wall, which can reduce the external space of the battery cell that is additionally occupied by the connection terminal and the electrode terminal, facilitate the grouping of the battery cells into a battery, and help reduce the volume of the battery after the battery cells are grouped, so as to improve the energy density of the battery.

[0017] In some embodiments, along the thickness direction of the first wall, the distance that the connection terminal protrudes from the first wall is less than or equal to the distance that the electrode terminal protrudes from the same side of the first wall. In this way, the extra space along the thickness direction of the battery cell occupied by the connection terminal is reduced, and after the battery cells are grouped, the volume of the battery cell occupied by the battery cell is reduced, which is conducive to improving the energy density of the battery.

[0018] In some embodiments, the battery cell further includes a sealant, and along the thickness direction of the first wall, the sealant at least partially abuts between the first wall and the connection terminal. The provision of the sealant is conducive to sealing the accommodating cavity of the battery cell, reducing the risk of external impurities entering the battery cell and corroding the battery cell, and reducing the risk of electrolyte leakage inside the battery cell.

[0019] In some embodiments, the battery cell further comprises a connector, which is located around the insulating member and connected to the first wall, so as to improve the connection strength between the connecting terminal and the insulating member, facilitate the installation of the connecting terminal, and simplify the assembly process of the connecting member.

[0020] In some embodiments, the connecting member is welded to the housing, which is advantageous for further improving the connection stability between the connecting terminal and the first wall.

[0021] In some embodiments, the insulating member is injection molded and connected to the connecting member and the connecting terminal, which is helpful to simplify the manufacturing process of the battery cell and improve the connection strength between the connecting terminal and the first wall.

[0022] In some embodiments, the connection terminal includes a first sub-portion and a second sub-portion connected to each other, and the first wall is arranged between the first sub-portion and the second sub-portion. Such an arrangement facilitates the connection between the connection terminal and the first wall.

[0023] In some embodiments, the first sub-section is connected to the second sub-section by riveting. This arrangement is conducive to improving the connection strength between the first sub-section and the second sub-section, and is conducive to simplifying the connection process between the first sub-section and the second sub-section.

[0024] In some embodiments, the housing includes a first wall and an electrode terminal disposed on the first wall, the electrode terminal is used to transmit electrical energy and is insulated from the first wall, the mounting hole is disposed through the electrode terminal along the thickness direction of the first wall, and the connecting terminal is connected to the electrode terminal. This is conducive to saving space on the first wall, facilitating the arrangement of other components on the first wall, and facilitating the reasonable arrangement of various components of the battery cell.

[0025] In some embodiments, the battery cell further includes a current collector and an electrode assembly, the current collector and the electrode assembly are contained in the housing, the current collector electrically connects the electrode assembly and the electrode terminal, the current collector has a through hole, and the connecting terminal is arranged through the through hole; or, the battery cell further includes a connecting wire, which passes through the through hole and is electrically connected to the connecting terminal. In this way, when the current collector covers the electrode terminal, the connecting terminal can still be electrically connected to the components inside the battery cell, so that the connecting terminal can transmit information.

[0026] In some embodiments, the battery cell further includes a detection element, which is disposed in the accommodating cavity and is used to detect the working condition of the battery cell, and the detection element is electrically connected to the connection terminal. The battery cell is provided with a detection element, so that the working condition of the battery cell can be detected by the detection element, which is conducive to ensuring the normal operation of the battery cell and improving the safety performance of the battery cell.

[0027] In some embodiments, the detection element includes a sensor, which further ensures the normal operation of the battery cell and improves the safety performance of the battery cell.

[0028] In a second aspect, an embodiment of the present application provides a battery, comprising a battery cell as in any embodiment of the first aspect.

[0029] The battery provided according to the embodiment of the present application has the same technical effect as the battery cell provided by any of the above embodiments, and thus will not be described in detail here.

[0030] In some embodiments, the battery further includes a control unit, which is electrically connected to the connection terminal and is used to transmit information with the connection terminal.

[0031] The control element can transmit information such as control signals to the connection terminals, and transmit them to the relevant execution components inside the battery cell through the connection terminals, or the connection terminals transmit information such as pressure, temperature, stress and gas composition inside the battery cell to the control element, so that the control element can judge the working condition of the battery cell, control the relevant components to adjust the working parameters, or send out an alarm to facilitate the operator to adjust the working parameters of the battery. This is conducive to further ensuring the normal operation of the battery and improving the safety performance of the battery.

[0032] In a third aspect, an embodiment of the present application provides an electrical device, including a battery as in the embodiment of the second aspect, and the battery is used to provide electrical energy.

[0033] The electric device provided in the embodiment of the present application has the same technical effect as the battery provided in the embodiment of the present application, and thus will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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.

[0035] Figure 1 A schematic diagram of the structure of a vehicle provided in one embodiment of the present application;

[0036] Figure 2 An exploded schematic diagram of a battery provided in one embodiment of the present application;

[0037] Figure 3 A schematic diagram of the structure of a battery module in a battery provided in an embodiment of the present application;

[0038] Figure 4 An exploded schematic diagram of a battery cell provided in an embodiment of the present application;

[0039] Figure 5 A front view of a battery cell provided in an embodiment of the present application with some structures omitted;

[0040] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure along AA;

[0041] Figure 7 A front view of another battery cell provided by an embodiment of the present application with some structures omitted;

[0042] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure along BB;

[0043] Fig. 9 for Figure 7 Schematic diagram of the explosion structure;

[0044] Fig.10 A front view of another battery cell provided by an embodiment of the present application with some structures omitted;

[0045] Fig.11 for Fig.10 Schematic diagram of the cross-sectional structure along CC;

[0046] Fig.12 for Fig.10 Schematic diagram of the explosion structure;

[0047] Fig.13 A front view of another battery cell provided by an embodiment of the present application with some structures omitted;

[0048] Fig.14 for Fig.13 Schematic diagram of the cross-sectional structure along DD;

[0049] Fig.15 for Fig.14 A partial enlarged view of position E in the middle;

[0050] Fig.16 for Fig.14 Another partial enlarged view of point E in the middle.

[0051] In the drawings, the drawings are not drawn to scale.

[0052] Description of reference numerals:

[0053] 1. Vehicle; 1a. Motor; 1b. Controller;

[0054] 10. Battery; 11. First box body; 12. Second box body;

[0055] 20. Battery module;

[0056] 30. Battery cell; 31. Shell; 31a. Accommodation cavity; 31b. Mounting hole; 311. Shell; 311a. Opening; 312. End cover; 313. First wall; 32. Electrode assembly; 321. Electrode body; 322. Tab; 33. Connecting terminal; 331. First sub-section; 332. Second sub-section; 33a. Protrusion; 34. Insulating member; 34a. Groove; 35. Electrode terminal; 36. Sealing member; 37. Connecting member; 38. Current collector; 38a. Through hole; 39. Detection element;

[0057] X, thickness direction. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0059] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0060] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0061] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0062] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, C and / or D can represent: C exists alone, C and D exist at the same time, and D exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0063] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0064] The term "plurality" used in the present application refers to two or more (including two).

[0065] In the present application, battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells or magnesium-ion battery cells, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0066] 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.

[0067] A battery cell includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. A 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 current collector and a positive active material layer, and the positive active material layer is coated on the surface of the positive current collector; the positive current collector includes a positive current collector and a positive convex portion protruding from the positive current collector, the positive current collector is coated with the positive active material layer, at least part of the positive convex portion is not coated with the positive active material layer, and the positive convex portion serves as a positive electrode ear. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, the positive active material layer includes a positive active material, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collector and a negative electrode protrusion protruding from the negative electrode current collector, the negative electrode current collector is coated with a negative electrode active material layer, at least part of the negative electrode protrusion is not coated with the negative electrode active material layer, and the negative electrode protrusion serves as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator may be PP (polypropylene, polypropylene) or PE (polyethylene, 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.

[0068] After the inventors discovered the problem of low safety performance of battery cells, they conducted a systematic analysis and research on the structure and working process of battery cells. It was found that during the operation of the battery cells, they undergo multiple charge and discharge cycles, have side reactions, and continuously generate gas, which causes a certain air pressure inside the battery cells, resulting in the risk of deformation and structural strength failure of the battery cells. In addition, the electrode assemblies in the battery cells will expand during the cycle, and the electrolyte inside the battery cells will be continuously consumed. If the internal abnormal phenomena that occur during the operation of these battery cells are not discovered in time, the operators will not be able to take necessary countermeasures, which will seriously affect the safety performance of the battery cells.

[0069] Based on the above problems discovered by the inventors, the inventors have improved the structure of the battery cell. The technical solutions described in the embodiments of the present application are applicable to the battery cell, the battery including the battery cell, and the electrical device using the battery.

[0070] The battery cell provided according to the embodiment of the present application includes a shell and an electrical connection terminal. The shell has a mounting hole. The connection terminal is at least partially arranged in the mounting hole and is insulated from the shell. The connection terminal is used for information exchange between the inside and outside of the battery cell.

[0071] The battery cell provided in the embodiment of the present application can transmit the working condition inside the battery cell to an external control element in a timely manner through the connecting terminal by setting a connecting terminal, or transmit the control signal of the external control element to the execution component inside the battery cell, so as to realize the information interaction between the inside and outside of the battery cell, facilitate real-time understanding of the working condition inside the battery cell, or facilitate timely transmission of control signals to the inside of the battery cell, which is beneficial to improving the safety of the battery cell.

[0072] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0073] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0074] like Figure 1 As shown, a battery 10 is provided inside the vehicle 1. The battery 10 may be provided at the bottom, head, or tail of the vehicle 1. The battery 10 may be used to power the vehicle 1, for example, the battery 10 may be used as an operating power source for the vehicle 1.

[0075] The vehicle 1 may further include a controller 1b and a motor 1a. The controller 1b is used to control the battery 10 to supply power to the motor 1a, for example, to meet the power requirements of the vehicle 1 during starting, navigation and driving.

[0076] In some embodiments of the present application, the battery 10 can not only serve as an operating power source for the vehicle 1, but also serve as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0077] See also Figure 2 As shown, the battery 10 includes a battery cell ( Figure 2(not shown). The battery 10 may further include a case for accommodating the battery cells.

[0078] The box body is used to accommodate battery cells, and the box body can be in various structural forms. In some embodiments, the box body may include a first box body portion 11 and a second box body portion 12. The first box body portion 11 and the second box body portion 12 cover each other. The first box body portion 11 and the second box body portion 12 jointly define a storage space for accommodating battery cells. The second box body portion 12 can be a hollow structure with one end open, the first box body portion 11 is a plate-like structure, and the first box body portion 11 covers the open side of the second box body portion 12 to form a box body with a storage space; the first box body portion 11 and the second box body portion 12 can also be hollow structures with one side open. The open side of the first box body portion 11 covers the open side of the second box body portion 12 to form a box body with a storage space. Of course, the first box body portion 11 and the second box body portion 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0079] In order to improve the sealing performance after the first box body 11 and the second box body 12 are connected, a sealing member, such as a sealant, a sealing ring, etc., may be further provided between the first box body 11 and the second box body 12 .

[0080] Assuming that the first box body portion 11 covers the second box body portion 12 , the first box body portion 11 can also be referred to as an upper box cover, and the second box body portion 12 can also be referred to as a lower box body.

[0081] In the battery 10, there can be one or more battery cells. If there are more than one battery cell, the battery cells can be connected in series, in parallel, or in a mixed connection. Mixed connection means that the battery cells are connected in series and in parallel. The battery cells can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the battery cells can be accommodated in the box. Alternatively, the battery cells can be first connected in series, in parallel, or in a mixed connection to form a battery module 20. The battery modules 20 are then connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the box.

[0082] In some embodiments, Figure 3 As shown, Figure 3 for Figure 2 The structure diagram of the battery module 20 is shown. In the battery module 20, there are multiple battery cells 30. The multiple battery cells 30 are first connected in series, in parallel, or in mixed series to form the battery module 20. The multiple battery modules 20 are then connected in series, in parallel, or in mixed series to form a whole, and are accommodated in the box.

[0083] In some embodiments, the multiple battery cells 30 in the battery module 20 may be electrically connected via a busbar component to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 30 in the battery module 20 .

[0084] Please refer to Figure 4 , Figure 4 for Figure 3 The exploded schematic diagram of the battery cell 30 is shown. The battery cell 30 provided in the embodiment of the present application comprises an electrode assembly 32 and a housing 31, wherein the housing 31 has a receiving cavity 31a, and the electrode assembly 32 is received in the receiving cavity 31a.

[0085] In some embodiments, the housing 31 may include a shell 311 and an end cap 312, wherein the shell 311 is a hollow structure having an opening 311a on one side, and the end cap 312 covers the opening 311a of the shell 311 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 32 and the electrolyte.

[0086] When assembling the battery cell 30 , the electrode assembly 32 may be placed in the housing 311 first, the end cap 312 may be closed on the opening 311 a of the housing 311 , and then the electrolyte may be injected into the housing 311 through the electrolyte injection port on the end cap 312 .

[0087] In some embodiments, the housing 31 may also be used to contain electrolyte, such as electrolyte. The housing 31 may be in various structural forms.

[0088] like Figure 4 A schematic structural diagram of a battery cell 30 provided in an embodiment of the present application is shown.

[0089] The shell 311 can be in various shapes, such as a cylinder, a cuboid, etc. The shape of the shell 311 can be determined according to the specific shape of the electrode assembly 32. For example, if the electrode assembly 32 is a cylindrical structure, the shell 311 can be a cylindrical structure. If the electrode assembly 32 is a cuboid structure, the shell 311 can be a cuboid structure. Figure 4 In the figure, illustratively, the shell 311 and the electrode assembly 32 are both rectangular parallelepiped structures.

[0090] The shell 311 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0091] There may be one or more electrode assemblies 32 contained in the housing 311. Figure 4 In the embodiment, there are two electrode assemblies 32 housed in the shell 311.

[0092] The electrode assembly 32 includes an electrode body 321 and a tab 322 . The tab 322 is led out from the end of the electrode body 321 .

[0093] like Figure 5 FIG. 4 shows a front view of a battery cell provided by an embodiment of the present application with some structures omitted, such as Figure 6 Shows Figure 5Schematic diagram of the cross-sectional structure along AA.

[0094] like Figure 4 , Figure 5 and Figure 6 As shown, the battery cell 30 provided according to the embodiment of the present application includes a shell 31 and a connecting terminal 33, the shell 31 has a mounting hole 31b, the connecting terminal 33 is at least partially arranged in the mounting hole 31b, and is insulated from the shell 31, and the connecting terminal 33 is used for information exchange between the inside and outside of the battery cell 30.

[0095] Optionally, the mounting hole 31b may be cylindrical, elliptical or other irregular shapes, and may be arranged according to the specific shape of the connection terminal 33. The inner diameter of the mounting hole 31b may be fixed or variable, and illustratively, the inner wall of the mounting hole 31b has a step.

[0096] The connection terminal 33 may be in a column shape, a block shape or other irregular shapes.

[0097] It can be understood that the shell 31 can have multiple interconnected walls, and the connection terminal 33 can be set on one surface of the shell 31, or the connection terminal 33 can be set on different walls of the shell 31. Of course, one connection terminal 33 can be set on one wall of the shell 31, or multiple connection terminals 33 can be set on one wall of the shell 31.

[0098] Optionally, the mounting hole 31b can be set through the shell 31, and the connecting terminal 33 can be located entirely in the mounting hole 31b, or a portion of the connecting terminal 33 can be set in the mounting hole 31b, as long as the connecting terminal 33 can electrically connect the relevant components inside and outside the battery cell 30.

[0099] The connection terminal 33 can be an optical fiber, a cable or a conductive structure, so that the connection terminal 33 has the function of transmitting optical signals or electrical signals, and the optical signal and the electrical signal can be used as information carriers. In this way, the connection terminal 33 can be used as a part of the information transmission path and has the function of transmitting information.

[0100] Optionally, the information transmitted by the connection terminal 33 may be the working condition inside the battery cell 30, such as at least one of the information of pressure, temperature and gas content, or the control signal sent by the control element outside the battery cell 30 to the internal components of the battery cell 30.

[0101] Optionally, information outside the battery cell 30, such as a control signal sent by a control element of the battery 10, can be transmitted to the inside of the battery cell 30 through the connection terminal 33. For example, the connection terminal 33 can connect the lithium replenishing component inside the battery 10 and the control element outside the battery cell 30, so that the control element transmits the control signal to the lithium replenishing component inside the battery cell 30 through the connection terminal 33, thereby enabling the lithium replenishing component to release lithium ions or lithium monomers in time to ensure the normal operation of the battery cell 30.

[0102] Optionally, the information inside the battery cell 30, such as the internal air pressure and temperature of the battery cell 30, can be transmitted to the outside of the battery cell 30 through the connection terminal 33. Exemplarily, the connection terminal 33 can connect the pressure sensor inside the battery cell 30 and the control element outside the battery cell 30. The pressure sensor transmits the pressure information inside the battery cell 30 detected to the control element through the connection terminal 33, so that the control element can determine whether there is a risk of excessive pressure in the battery cell 30, and the control element can control the operation of related components to eliminate the hidden danger of excessive pressure inside the battery cell 30.

[0103] Depending on the form of the signal to be transmitted by the connection terminal 33, the connection terminal 33 may be connected to a wire, an optical fiber, or a cable. For example, the connection terminal 33 may be electrically connected to a control element outside the battery cell 30 through a wire, and electrically connected to components such as sensors inside the battery cell 30 through a cable.

[0104] The battery cell 30 provided in the embodiment of the present application can realize information interaction between the inside and outside of the battery cell 30 by setting the outer shell 31 with a mounting hole 31b and setting the connecting terminal 33 at least partially in the mounting hole 31b, so as to transmit information such as the working condition inside the battery cell 30 to the outside of the battery cell 30, or transmit information such as the control signal outside the battery cell 30 to the inside of the battery cell 30, so as to facilitate information interaction between related components inside the battery cell 30 and related components outside the battery cell 30, so as to ensure the normal operation of the battery cell 30, which is beneficial to improving the safety performance of the battery cell 30.

[0105] like Figure 7 It shows a front view of another battery cell with some structures omitted. Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure along BB, Fig. 9 for Figure 7 Schematic diagram of the explosion structure.

[0106] like Figures 7 to 9 As shown, in some embodiments, a plurality of mounting holes 31 b are arranged at intervals, and a connecting terminal 33 is arranged in each mounting hole 31 b.

[0107] The battery cell 30 usually needs to transmit a variety of information such as temperature, pressure and gas composition, and for some information, multiple wires are often required to transmit simultaneously. Therefore, the battery cell 30 is provided with multiple connection terminals 33 arranged at intervals to facilitate the information transmission between the inside and outside of the battery cell 30, and to facilitate the function of simultaneously transmitting multiple information between the inside and outside of the battery cell 30.

[0108] Optionally, in order to achieve insulation between the connection terminal 33 and the housing 31 , an insulating member may be additionally provided between the connection terminal 33 and the housing 31 , or the connection terminal 33 itself may be provided with an insulating member.

[0109] In some embodiments, the battery cell 30 further includes an insulating member 34 , which is at least partially disposed between the connection terminal 33 and an inner wall of the mounting hole 31 b .

[0110] Optionally, a portion of the insulating member 34 may be disposed between the inner wall of the mounting hole 31 b and the connection terminal 33 , or the entire insulating member 34 may be disposed between the inner wall of the mounting hole 31 b and the connection terminal 33 .

[0111] Optionally, the insulating member 34 may be tubular and located between the electrode assembly 32, the connection terminal 33 and the inner wall of the mounting hole 31b. Alternatively, the insulating member 34 includes an annular portion and an annular protrusion protruding outward from the end of the portion, wherein the annular portion is located between the inner wall of the mounting hole 31b and the connection terminal 33, and the protrusion is located on the surface of one side of the housing 31 to limit the insulating member 34.

[0112] Therefore, the insulating member 34 is provided to achieve mutual insulation between the connecting terminal 33 and the housing 31 , so that the connecting terminal 33 can transmit information more accurately and quickly.

[0113] like Figure 5 and Figure 6 As shown, in some embodiments, one of the connecting terminal 33 and the insulating member 34 is formed with a groove 34a, and the other is formed with a protrusion 33a, and the groove 34a and the protrusion 33a cooperate with each other.

[0114] Optionally, the groove 34a and the protrusion 33a may be arranged in an annular shape, surrounding the connection terminal 33, or the groove 34a and the protrusion 33a may be arranged in a fan-shaped shape, that is, a part of the annular shape, either of which can realize the mutual limitation of the connection terminal 33 and the insulating member 34.

[0115] Optionally, a groove 34 a may be formed on the connection terminal 33 , and a protrusion 33 a may be formed on the insulating member 34 , or a protrusion 33 a may be formed on the connection terminal 33 , and a groove 34 a may be formed on the insulating member 34 .

[0116] Through the cooperation between the groove 34a and the protrusion 33a, the connection terminal 33 and the insulating member 34 are limited, thereby reducing the risk of mutual movement between the two.

[0117] Continue reading Figure 5 and Figure 6 In some embodiments, a circular protrusion 33 a is formed on the peripheral surface of the connecting terminal 33 , and a circular groove 34 a is formed on the inner wall of the insulating member 34 .

[0118] The size of the connection terminal 33 is usually small, and the protrusion 33a is arranged on the connection terminal 33 to facilitate the processing of the connection terminal 33. The protrusion 33a and the groove 34a are arranged in an annular shape, which improves the limiting effect of the protrusion 33a and the groove 34a on the connection terminal 33 and the insulating member 34. Since the protrusion 33a and the groove 34a are in an annular shape, the protrusion 33a and the groove 34a can be matched at any position along the circumference of the protrusion 33a and the groove 34a, which is conducive to reducing the difficulty of assembling the connection terminal 33 and the insulating member 34.

[0119] There is no limitation on the height of the protrusion 33a protruding from the surface of the connecting terminal 33, and the height can be selected according to actual needs.

[0120] In some embodiments, a distance h1 of the protrusion 33 a protruding from the peripheral surface of the connection terminal 33 satisfies: h1 ≥ 0.1 mm.

[0121] Exemplarily, the distance h1 of the protrusion 33 a protruding from the peripheral surface of the connecting terminal 33 may be 0.1 mm, 0.2 mm, 0.5 mm or 1 mm, etc., which may be selected according to actual needs.

[0122] It is understandable that setting the height of the protrusion 33a protruding from the peripheral surface of the connecting terminal 33 to satisfy the above relationship is conducive to ensuring the area of ​​mutual cooperation between the protrusion 33a and the groove 34a, and is conducive to ensuring the mutual limiting effect of the connecting terminal 33 and the insulating member 34.

[0123] One connection terminal 33 may be formed with one protrusion 33 a, or one connection terminal 33 may have a plurality of protrusions 33 a disposed at intervals.

[0124] In some embodiments, the connection terminal 33 is formed with a plurality of protrusions 33 a disposed at intervals, and a distance L between adjacent protrusions 33 a satisfies L≥0.1 mm.

[0125] Exemplarily, L can be 0.1 mm, 0.2 mm, 0.5 mm or 1 mm, etc., and can be selected according to actual needs.

[0126] Multiple protrusions 33a can be arranged at intervals along the axial direction of the mounting hole 31b. Arranging the connecting terminal 33 to form multiple spaced protrusions 33a is beneficial to further ensure the matching area of ​​the protrusion 33a and the groove 34a, so as to further ensure the mutual limiting effect of the connecting terminal 33 and the insulating member 34.

[0127] Along the axial direction of the mounting hole 31 b , the plurality of protrusions 33 a may be arranged at even intervals, or at any suitable intervals, which are not limited here and may be selected according to actual needs.

[0128] Setting the spacing L between adjacent protrusions 33a to satisfy the above relationship facilitates the processing of the protrusions 33a and the grooves 34a, and is also beneficial to further improve the limiting effect of the cooperation between the protrusions 33a and the grooves 34a on the connecting terminal 33 and the insulating member 34.

[0129] In some embodiments, the housing 31 includes a first wall 313 , and the mounting hole 31 b is disposed through the first wall 313 .

[0130] Optionally, the first wall 313 may be a part of the housing 311, or the first wall 313 may be a part of the end cover 312. Alternatively, the first wall 313 includes a part of the housing 311 and a part of the end cover 312, that is, the housing 311 and the end cover 312 are both provided with mounting holes 31b. The specific arrangement may be made according to actual needs.

[0131] The mounting hole 31b may be cylindrical, elliptical or in other shapes, and may be specifically configured according to the shape of the connection terminal 33. The mounting hole 31b is configured to penetrate the first wall 313, so as to facilitate the installation of the connection terminal 33.

[0132] In some embodiments, the battery cell 30 further includes an electrode terminal 35 disposed on the first wall 313 . The electrode terminal 35 is used to transmit electrical energy and is spaced apart from the connection terminal 33 .

[0133] The electrode terminal 35 is used to transmit electrical energy, and can be conductively connected to the tab 322 of the electrode assembly 32 inside the battery cell 30, or the electrode terminal 35 can be electrically connected to the lithium replenishing component inside the battery 10 through a wire, so as to transmit electrical energy to the lithium replenishing component at an appropriate time, so that the lithium replenishing component releases lithium monomers or lithium ions.

[0134] The electrode terminal 35 and the connection terminal 33 are spaced apart to reduce the risk of electrical conduction between the electrode terminal 35 and the connection terminal 33 affecting the normal operation of the battery cell 30 .

[0135] It can be understood that since the electrical connection terminal 33 or the electrode terminal 35 may protrude from the surface of the outer shell 31, and the connection terminal 33 is usually connected to an external control element through a wire, the connection terminal 33, the electrode terminal 35 and the wire will occupy part of the additional space outside the outer shell 31. By setting the connection terminal 33 and the electrode terminal 35 on the first wall 313, the external space of the battery cell 30 that is additionally occupied by the setting of the connection terminal 33 and the electrode terminal 35 can be reduced, which is convenient for the battery cells 30 to be assembled into the battery 10, and is beneficial to reducing the volume of the battery 10 after the battery cells 30 are assembled, so as to improve the energy density of the battery 10.

[0136] In some embodiments, along the thickness direction X of the first wall 313 , the distance that the connection terminal 33 protrudes from the first wall 313 is less than or equal to the distance that the electrode terminal 35 protrudes from the same side of the first wall 313 .

[0137] It should be noted that this is a comparison of the distances by which the connection terminal 33 and the electrode terminal 35 on the same side of the first wall 313 along the thickness direction X protrude from the first wall 313 .

[0138] Along the thickness direction X of the first step, the connection terminal 33 and the electrode terminal 35 on the same side of the first wall 313 are respectively protruded from the first wall 313, and the distance of the connection terminal 33 protruding from the first wall 313 is less than or equal to the distance of the electrode terminal 35 protruding from the first wall 313 on the same side of the first wall 313.

[0139] The distance that the connection terminal 33 protrudes from the first wall 313 is the distance between the end surface of the connection terminal 33 and the first wall 313 along the thickness direction X. Similarly, the distance that the electrode terminal 35 protrudes from the first wall 313 is the distance between the end surface of the electrode terminal 35 and the first wall 313 along the thickness direction X.

[0140] In this way, the connecting terminal 33 does not protrude from the electrode terminal 35 on any side of the first wall 313 along the thickness direction X. In this way, the additional space occupied by the connecting terminal 33 outside the battery cell 30 along the thickness direction X is reduced. After the battery cells 30 are grouped, the volume of the battery 10 occupied by the battery cells 30 is reduced, which is beneficial to improving the energy density of the battery 10.

[0141] like Fig.10 FIG. 2 shows a front view of another battery cell provided by an embodiment of the present application with some structures omitted; Fig.11 Shows Fig.10 Schematic diagram of the cross-sectional structure along CC; Fig.12 Shows Fig.10 Schematic diagram of the explosion structure.

[0142] like Figures 7 to 12As shown, in some embodiments, the battery cell 30 further includes a seal 36 , and along the thickness direction X of the first wall 313 , the seal 36 at least partially abuts between the first wall 313 and the connection terminal 33 .

[0143] The connection terminal 33 may have a sealing surface opposite to a portion of the first wall 313 , and a seal 36 may be disposed between the first wall 313 and the sealing surface of the connection terminal 33 to achieve sealing of the inside and outside of the housing 31 .

[0144] Optionally, the seal 36 can be arranged in the mounting hole 31b, or the seal 36 can be arranged outside the mounting hole 31b. For example, the seal 36 can be arranged on the side of the first wall 313 away from the accommodating cavity 31a, or the seal 36 can be arranged on the side of the first wall 313 close to the accommodating cavity 31a.

[0145] The sealing member 36 is provided to seal the accommodating cavity 31 a of the battery cell 30 , reduce the risk of external impurities entering the battery cell 30 and corroding the battery cell 30 , and reduce the risk of electrolyte leakage in the battery cell 30 .

[0146] like Figures 10 to 12 As shown, in some embodiments, the battery cell 30 further includes a connecting member 37 , which is located on a peripheral side of the insulating member 34 and connected to the first wall 313 .

[0147] Optionally, the connector 37 may be connected to the first wall 313 by welding, riveting, bonding, etc. The connector 37 is provided and arranged on the peripheral side of the insulating member 34. In the manufacturing process of the battery cell 30, the connecting terminal 33 may be first connected to the connector 37 through the insulating member 34, and then the connector 37 may be connected to the first wall 313. Exemplarily, the connector 37, the insulating member 34, and the connecting terminal 33 may be formed by an injection molding process.

[0148] This is beneficial to improving the connection strength between the connecting terminal 33 and the insulating member 34 , facilitating the installation of the connecting terminal 33 , and simplifying the assembly process of the connecting member 37 .

[0149] In some embodiments, in some embodiments, the connecting member 37 is welded to the housing 31. Such a configuration is conducive to further improving the connection stability between the connecting terminal 33 and the housing 31.

[0150] In some embodiments, the insulating member 34 is injection molded and connects the fixing member and the connecting terminal 33 .

[0151] In this way, after the connector 37 and the connection terminal 33 are respectively manufactured and formed, a high-temperature flowing plastic is injected between the two, and the flowing plastic is cooled to form an insulating member 34, thereby achieving an insulated connection between the connector 37 and the connection terminal 33. The connector 37 is then welded to the first wall 313.

[0152] This is beneficial to simplifying the manufacturing process of the battery cell 30 and improving the connection strength between the connection terminal 33 and the first wall 313 .

[0153] like Figures 7 to 9 As shown, in some embodiments, the connection terminal 33 includes a first sub-portion 331 and a second sub-portion 332 connected to each other, and the first wall 313 is disposed between the first sub-portion 331 and the second sub-portion 332 .

[0154] Optionally, the first sub-portion 331 and the second sub-portion 332 may be connected by welding, riveting, or threading.

[0155] In the embodiment where the battery cell 30 includes the seal 36, the seal 36 may be disposed between the first sub-portion 331 and the first wall 313, or between the second sub-portion 332 and the first wall 313. The specific configuration may be selected according to actual needs.

[0156] Optionally, one of the first sub-section 331 and the second sub-section 332 may have a protrusion, and the protrusion is disposed in the mounting hole 31b, and the protrusion is connected to the other of the first sub-section 331 and the second sub-section 332. Alternatively, both the first sub-section 331 and the second sub-section 332 may have a protrusion, and the protrusion is disposed in the mounting hole 31b, and the first sub-section 331 and the second sub-section 332 are connected via the protrusion.

[0157] The connection terminal 33 includes a first sub-portion 331 and a second sub-portion 332 , and the first wall 313 is disposed between the first sub-portion 331 and the second sub-portion 332 , so as to facilitate the connection between the connection terminal 33 and the first wall 313 .

[0158] In some embodiments, the first sub-portion 331 is connected to the second sub-portion 332 by riveting.

[0159] Specifically, one of the first sub-part 331 and the second sub-part 332 may have a riveting boss and the other may have a riveting hole. The riveting boss is passed through the riveting hole and inserted into the riveting hole. The riveting boss is then punched to rivet the riveting boss and the riveting hole.

[0160] Such a configuration is beneficial to improving the connection strength between the first sub-section 331 and the second sub-section 332 , and is beneficial to simplifying the connection process between the first sub-section 331 and the second sub-section 332 .

[0161] like Fig.13 FIG. 2 shows a front view of another battery cell 30 provided in an embodiment of the present application with some structures omitted; Fig.14 Shows Fig.13 Schematic diagram of the cross-sectional structure along DD; 15 and Fig.16 In different embodiments Fig.14 A partial enlarged view of point E in the middle.

[0162] like Figures 13 to 16 As shown, in some embodiments, the housing 31 includes a first wall 313 and an electrode terminal 35 arranged on the first wall 313, the electrode terminal 35 is used to transmit electric energy and is insulated from the first wall 313, the mounting hole 31b is arranged along the thickness direction X of the first wall 313 through the electrode terminal 35, and the connecting terminal 33 is connected to the electrode terminal 35.

[0163] Optionally, the electrode terminal 35 may be electrically connected to the tab 322 of the electrode assembly 32 inside the battery cell 30, or the electrode terminal 35 may be electrically connected to the lithium supplement component inside the battery cell 30 through a wire. The selection may be based on actual needs.

[0164] Setting the mounting hole 31 b through the electrode terminal 35 and connecting the connecting terminal 33 to the electrode terminal 35 is beneficial to saving space on the first wall 313 , facilitating the arrangement of other components on the first wall 313 , and facilitating the reasonable arrangement of the components of the battery cell 30 .

[0165] like Figure 4 As shown, in some embodiments, the battery cell 30 further includes a current collector 38 and an electrode assembly 32, the current collector 38 and the electrode assembly 32 are accommodated in the housing 31, the current collector 38 electrically connects the electrode assembly 32 and the electrode terminal 35, and the current collector 38 has a through hole 38a. The connecting terminal 33 is arranged through the through hole 38a, or the battery cell 30 further includes a connecting wire, the connecting wire passes through the through hole 38a, and is electrically connected to the connecting terminal 33.

[0166] The connection terminal 33 is usually electrically connected to components such as sensors inside the battery cell 30 through a wire such as a cable. The current collector 38 is provided with a through hole 38a, and the connection terminal 33 can be inserted into the through hole 38a, or the connection wire can be inserted into the through hole 38a, so that the connection terminal 33 or the wire passes through the current collector 38 to connect with each other.

[0167] With such arrangement, when the current collector 38 covers the electrode terminal 35 , the connection terminal 33 can still be electrically connected to the components inside the battery cell 30 , so that the connection terminal 33 can transmit information.

[0168] like Figure 4As shown, in some embodiments, the battery cell 30 further includes a detection element 39 , which is disposed in the accommodating cavity 31 a and is used to detect the working condition of the battery cell 30 , and the detection element 39 is electrically connected to the connection terminal 33 .

[0169] Optionally, the detection element 39 may be a sensor, etc., which can be used to detect information such as pressure, temperature or gas composition inside the battery cell 30. The above information is transmitted to components such as control elements outside the battery cell 30 through the connection terminal 33, so that the control elements and other components can adjust relevant working parameters in time according to the working conditions of the battery cell 30 to ensure the normal operation of the battery cell 30.

[0170] Therefore, the battery cell 30 is provided with a detection element 39 so as to detect the working condition of the battery cell 30 through the detection element 39 , which is beneficial to ensure the normal working of the battery cell 30 and improve the safety performance of the battery cell 30 .

[0171] In some embodiments, the detection element 39 includes a sensor.

[0172] Optionally, the detection element 39 can be at least one of a pressure sensor, a temperature sensor, a gas composition detection sensor or a stress sensor. The pressure sensor, the temperature sensor, the gas composition detection sensor and the stress sensor can be used to detect the air pressure inside the battery cell 30, the temperature of the related structure, the content of the gas component inside the battery cell 30 and the internal stress of the related components such as the electrode assembly 32 and other working parameters respectively. The above working parameters are transmitted to the control element outside the battery cell 30 through the connecting terminal 33 to realize the information exchange between the inside and outside of the battery cell 30. The control element determines whether the transmitted working parameters are within the normal working range. If there is any abnormality, the relevant working parameters can be adjusted in time to further ensure the normal operation of the battery cell 30 and improve the safety performance of the battery cell 30.

[0173] The battery 10 provided according to an embodiment of the present application includes the battery cell 30 provided in any of the above embodiments.

[0174] The battery 10 provided in the embodiment of the present application has the same technical effect as the battery cell 30 provided in any of the above embodiments, and thus will not be described in detail here.

[0175] In some embodiments, the battery 10 further includes a control element, which is electrically connected to the connection terminal 33 and is used to transmit information to the connection terminal 33 .

[0176] Optionally, the control element can transmit information such as control signals to the connection terminal 33, and transmit it to the relevant execution components inside the battery cell 30 through the connection terminal 33, or the connection terminal 33 transmits information such as pressure, temperature, stress and gas composition inside the battery cell 30 to the control element, so that the control element can judge the working condition of the battery cell 30, control the relevant components to adjust the working parameters, or the control element sends out an alarm to facilitate the operator to adjust the working parameters of the battery 10.

[0177] Therefore, configuring the battery 10 to include a control element is beneficial to further ensure the normal operation of the battery 10 and to improve the safety performance of the battery 10 .

[0178] The electrical device provided according to an embodiment of the present application includes the battery 10 provided in any of the above embodiments, and the battery 10 is used to provide electrical energy.

[0179] The electric device provided in the embodiment of the present application has the same technical effect as the battery 10 provided in any of the above embodiments, and thus will not be described in detail here.

[0180] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0181] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell, characterized in that: include: A housing having a mounting hole and a receiving cavity; A connection terminal, at least partially disposed in the mounting hole and insulated from the housing, the connection terminal being used for information exchange between the inside and outside of the battery cell; an insulating member, wherein the insulating member is at least partially disposed between the connecting terminal and an inner wall of the mounting hole; One of the connecting terminal and the insulating member is formed with a groove, and the other is formed with a protrusion, and the groove and the protrusion are matched with each other.

2. The battery cell according to claim 1, characterized in that: The plurality of mounting holes are arranged at intervals, and the connection terminal is arranged in each mounting hole.

3. The battery cell according to claim 1 or 2, characterized in that: The circumferential side surface of the connection terminal is formed with the annular protrusion, and the inner wall of the insulating member is formed with the annular groove.

4. The battery cell according to claim 1 or 2, characterized in that: A distance h1 of the protrusion protruding from the peripheral side surface of the connection terminal satisfies: h1 ≥ 0.1 mm.

5. The battery cell according to claim 1 or 2, characterized in that: The connection terminal is formed with a plurality of protrusions arranged at intervals, and a distance L between two adjacent protrusions satisfies: L≥0.1 mm.

6. The battery cell according to claim 1, characterized in that: The housing includes a first wall, and the mounting hole is disposed through the first wall.

7. The battery cell according to claim 6, characterized in that: The battery cell further includes an electrode terminal disposed on the first wall. The electrode terminal is used to transmit electric energy and is spaced apart from the connection terminal.

8. The battery cell according to claim 7, characterized in that: Along the thickness direction of the first wall, the distance that the connecting terminal protrudes from the first wall is less than or equal to the distance that the electrode terminal protrudes from the same side of the first wall.

9. The battery cell according to any one of claims 6 to 8, characterized in that: The battery cell further includes a sealing member, and along a thickness direction of the first wall, the sealing member at least partially abuts between the first wall and the connecting terminal.

10. The battery cell according to any one of claims 6 to 8, characterized in that: The battery cell further includes a connecting member, which is located on a peripheral side of the insulating member and connected to the first wall.

11. The battery cell according to claim 10, characterized in that: The connecting piece is connected to the shell by welding.

12. The battery cell according to claim 10, characterized in that: The insulating member is injection-molded and connects the connecting member and the connecting terminal.

13. The battery cell according to any one of claims 6 to 8, characterized in that: The connection terminal includes a first sub-portion and a second sub-portion connected to each other, and the first wall is disposed between the first sub-portion and the second sub-portion.

14. The battery cell according to claim 13, characterized in that: The first sub-section is connected to the second sub-section by riveting.

15. The battery cell according to claim 1, characterized in that: The shell includes a first wall and an electrode terminal arranged on the first wall, the electrode terminal is used to transmit electric energy and is insulated from the first wall, the mounting hole is arranged through the electrode terminal along the thickness direction of the first wall, and the connecting terminal is connected to the electrode terminal.

16. The battery cell according to claim 15, characterized in that: The battery cell further includes a current collector and an electrode assembly, the current collector and the electrode assembly are accommodated in the housing, the current collector electrically connects the electrode assembly and the electrode terminal, and the current collector has a through hole; The connecting terminal is arranged through the through hole; or, The battery cell further includes a connecting wire passing through the through hole and electrically connected to the connecting terminal.

17. The battery cell according to claim 1, characterized in that: The battery cell further comprises a detection element, which is disposed in the accommodating cavity and is used to detect the working condition of the battery cell. The detection element is electrically connected to the connecting terminal.

18. The battery cell according to claim 17, characterized in that: The detection element includes a sensor.

19. A battery, characterized in that: Comprising the battery cell according to any one of claims 1 to 18.

20. The battery according to claim 19, characterized in that It also includes a control unit, which is electrically connected to the connection terminal and is used to transmit information with the connection terminal.

21. An electrical device, characterized in that: Comprising a battery as claimed in claim 19 or 20, the battery is used to provide electrical energy.

Images