Battery cells, batteries and electrical devices

Abstract

The present application provides a battery cell, a battery and an electrical device, wherein the battery cell comprises a shell, an electrode assembly, an electrode terminal, a first insulating member and a second insulating member. The shell comprises a first wall, the electrode assembly is arranged in the shell, the electrode assembly comprises an electrode body and a tab, the electrode terminal is arranged on the first wall, and the electrode terminal is electrically connected to the tab. The first insulating member is arranged on the side of the first wall facing the electrode body, and has a boss protruding toward the electrode body, the boss abuts against the electrode terminal, the boss has a first surface facing the electrode body, and the first surface comprises a first inclined surface. The second insulating member is coated on the surface of the electrode body and connected to the side of the boss facing away from the electrode terminal. The first inclined surface is inclined toward the first wall from the side of the boss close to the second insulating member to the side close to the electrode terminal. The battery cell provided by the present application is conducive to reducing the risk of the first insulating member falling off from the first wall, and is conducive to improving the reliability of the battery cell.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0002] Batteries are widely used in electronic devices, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0003] In the development of battery cell technology, in addition to improving the performance of battery cells, the reliability of battery cells is also an issue that needs to be considered. Therefore, how to improve the reliability of battery cells is an issue of continuous improvement in battery cell technology. Utility Model Content

[0004] The present application provides a battery cell, a battery, and an electrical device to improve the reliability of the battery cell.

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

[0006] In the first aspect, the battery cell provided in the embodiment of the present application includes a shell, an electrode assembly, an electrode terminal, a first insulating member, and a second insulating member. The shell includes a first wall, the electrode assembly is arranged in the shell, the electrode assembly includes an electrode body and a pole ear, and the pole ear is led out from the end of the electrode body toward the first wall. The electrode terminal is arranged on the first wall, and the electrode terminal is electrically connected to the pole ear. The first insulating member is arranged on the side of the first wall facing the electrode body, and the first insulating member has a boss protruding toward the electrode body, the boss is located on one side of the electrode terminal and abuts against the electrode terminal, the boss has a first surface facing the electrode body, and the first surface includes a first inclined surface. The second insulating member is coated on the surface of the electrode body and connected to the side of the boss facing away from the electrode terminal. From the side of the boss close to the second insulating member to the side close to the electrode terminal, the first inclined surface is inclined toward the first wall.

[0007] The battery cell provided in the embodiment of the present application is provided with a first surface of the boss including a first inclined surface. When the second insulating member generates a pulling force toward the electrode body on the boss, the pulling force will generate a component force perpendicular to the first inclined surface. Since the boss and the electrode terminal are against each other, the component force perpendicular to the first inclined surface will be transmitted to the electrode terminal and generate a squeezing force on the electrode terminal. In this way, part of the pulling force generated by the second insulating member on the first insulating member is transmitted to the electrode terminal and borne by the electrode terminal, which is conducive to reducing the pulling force of the first insulating member on the first wall, reducing the risk of the first insulating member falling off the first wall, and further reducing the risk of the boss of the first insulating member squeezing the electrode body and causing damage to the electrode body, which is conducive to improving the reliability of the battery cell.

[0008] According to some embodiments of the present application, the first inclined surface is straight.

[0009] In the above scheme, it is convenient to set the size of the extrusion force borne by the electrode terminal by reasonably setting the inclination angle of the first inclined surface, and it is convenient for the tensile force borne by the boss to be more stably and fully transmitted to the electrode terminal, so that the electrode terminal can more stably resist the extrusion force of the boss, which is further beneficial to reduce the risk of the boss falling off the first wall.

[0010] According to some embodiments of the present application, the first surface further includes a flat surface, and the flat surface is perpendicular to the thickness direction of the first wall.

[0011] In the above solution, while the component of the pulling force of the second insulating member on the first insulating member is transmitted to the electrode terminal through the first inclined surface, it is also beneficial to improve the structural strength of the boss and facilitate the manufacturing process of the boss.

[0012] According to some embodiments of the present application, the first inclined surface is located on a side of the straight surface close to the electrode terminal.

[0013] In the above scheme, the pulling force of the second insulating member on the boss is transmitted to the electrode terminal via the first inclined surface, and an extrusion force perpendicular to the surface of the electrode terminal is generated on the electrode terminal, which is beneficial to improving the stability and reliability of the electrode terminal's load-bearing capacity, and further beneficial to reducing the risk of the boss falling off the first wall.

[0014] According to some embodiments of the present application, the boss has a cavity, and the first inclined surface is located on a side of the cavity facing the electrode body.

[0015] In the above scheme, when the boss exerts a compressive force on the electrode body, the deformation of the boss can play a certain buffering role, which is conducive to reducing the compressive force of the boss on the electrode body, thereby reducing the risk of the boss compressing the electrode body. It can also reduce the weight of the first insulating member, which is conducive to improving the energy density of the battery cell.

[0016] According to some embodiments of the present application, an angle α between the first inclined surface and a plane perpendicular to the thickness direction of the first wall satisfies: 5°≤α≤45°.

[0017] In the above scheme, setting 5°≤α≤45° is beneficial to increasing the extrusion force F11 perpendicular to the surface of the electrode terminal, reducing the pulling force of the boss on the first wall, thereby reducing the risk of the boss detaching from the first wall, and facilitating the manufacture of the first inclined surface.

[0018] According to some embodiments of the present application, the first insulating member further has a protrusion, which is arranged on a side of the boss facing the first wall, and the protrusion is sandwiched between the first wall and the electrode terminal.

[0019] In the above scheme, by setting a protrusion clamped between the first wall and the electrode terminal, the protrusion can limit the risk of the first insulating member moving relative to the first wall in a direction parallel to the first wall, which is beneficial to improving the structural stability of the battery cell and further improving the reliability of the battery cell.

[0020] According to some embodiments of the present application, the battery cell also includes a converter, which electrically connects the electrode terminal and the electrode lug, and the electrode terminal has a second inclined surface facing the electrode body, and the second inclined surface is inclined relative to a plane perpendicular to the thickness direction of the first wall, and at least a portion of the second inclined surface is in contact with the converter.

[0021] In the above scheme, the electrode terminal is provided with a second inclined surface facing the electrode body, which can increase the surface area of ​​the electrode terminal facing the electrode body. This is beneficial to increase the connection area between the electrode terminal and the adapter, thereby reducing the contact resistance between the adapter and the electrode terminal, which is beneficial to reduce the energy loss of the battery cell during the cycle operation and reduce the risk of excessive temperature of the battery cell.

[0022] According to some embodiments of the present application, the adapter abuts against the first inclined surface, and the inclination direction of the second inclined surface is the same as the inclination direction of the first inclined surface of the boss abutting against the electrode terminal.

[0023] In the above scheme, it is easy to realize the anti-mistake effect of the adapter during the assembly process, and it is beneficial to increase the matching area between the adapter and the first inclined surface and the second inclined surface respectively, thereby improving the structural stability of the adapter and facilitating the manufacturing and processing of the adapter.

[0024] According to some embodiments of the present application, the second inclined surface is parallel to the first inclined surface of the boss abutting against the electrode terminal.

[0025] In the above scheme, the parts of the adapter that cooperate with the first inclined surface and the second inclined surface are parallel to each other, which can realize the fool-proof effect of the adapter during assembly and help reduce the process difficulty during the manufacturing process of the adapter.

[0026] According to some embodiments of the present application, the adapter has a terminal connection surface and a first mating surface, the terminal connection surface is parallel to the second inclined surface and abuts against the second inclined surface, and the first mating surface is parallel to the first inclined surface and abuts against the first inclined surface.

[0027] In the above scheme, it is helpful to increase the matching area between the adapter and the electrode terminal and the boss respectively, which is helpful to further reduce the contact resistance between the adapter and the electrode terminal, and is helpful to improve the structural stability of the adapter.

[0028] According to some embodiments of the present application, the first insulating member also has a third inclined surface, which is located on the side of the electrode terminal facing away from the boss and is parallel to the first inclined surface. The adapter also has a second mating surface, which is parallel to the third inclined surface and abuts against the third inclined surface.

[0029] In the above scheme, the first mating surface and the second mating surface are respectively located on both sides of the terminal connection surface, and the second mating surface is against the third inclined surface. This is conducive to further increasing the mating area between the adapter and the first insulating member, further improving the stability of the mating between the adapter and the first insulating member, and thereby improving the reliability of the battery cell.

[0030] In a second aspect, the battery provided in the embodiments of the present application includes the battery cell provided in any of the above embodiments.

[0031] The battery provided in the embodiment of the present application has the same technical effect as the battery cell provided in any of the above embodiments, and thus will not be described in detail here.

[0032] In a third aspect, the electrical device provided in the embodiments of the present application includes the battery provided in the above embodiments, 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 above embodiment, and thus will not be described in detail here.

[0034] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0037] Figure 2 A schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0038] Figure 3 A schematic diagram of the structure of a battery module in a battery provided in an embodiment of the present application;

[0039] Figure 4 A schematic diagram of the explosion structure of a battery cell provided in an embodiment of the present application;

[0040] Figure 5 A top view of a battery cell provided in an embodiment of the present application;

[0041] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure along AA;

[0042] Figure 7 A schematic cross-sectional view of a portion of the structure of a battery cell provided in an embodiment of the present application;

[0043] Figure 8 for Figure 6 A partial enlarged view of point B in the middle.

[0044] In the drawings, the figures are not necessarily drawn to scale.

[0045] Description of reference numerals:

[0046] 1- Vehicle;

[0047] 10-battery; 111-first sub-box; 112-second sub-box; 11-box; 1a-motor; 1b-controller;

[0048] 20-battery module;

[0049] 30 - battery cell; 31 - housing; 311 - shell; 312 - end cover; 313 - first wall;

[0050] 32-electrode assembly; 321-electrode body; 322-electrode ear;

[0051] 33-electrode terminal; 33a-second inclined surface;

[0052] 34-first insulating member; 34a-third inclined surface; 341-boss; 341a-cavity; 342-protrusion; 3411-first surface; 3411a-first inclined surface; 3411b-flat surface;

[0053] 35- second insulating member;

[0054] 36 - adapter; 36a - terminal connection surface; 36b - first mating surface; 36c - second mating surface. DETAILED DESCRIPTION

[0055] 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 and completely 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.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning 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.

[0057] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations 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. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0058] 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.

[0059] 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, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0060] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0061] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0062] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0063] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0064] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0065] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0066] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0067] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0068] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0069] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0070] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium with surface silver plating can be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0071] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0072] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0073] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium may be used.

[0074] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0075] As an example, the negative electrode active material may adopt the negative electrode active material for the battery known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials and lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0076] In some embodiments, the diaphragm is an isolation membrane. The present application has no particular limitation on the type of isolation membrane, and any known isolation membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0077] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0078] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0079] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0080] In some embodiments, the electrode assembly is a laminate structure.

[0081] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0082] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0083] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab of the electrode assembly. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collector. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0084] In some embodiments, an explosion-proof valve is provided on the housing, and the explosion-proof valve is used to release the internal pressure of the battery cell.

[0085] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal prismatic battery, such as a hexagonal prismatic battery, etc. There is no particular limitation in the embodiments of the present application.

[0086] In a battery cell, a second insulating member is usually provided to cover the surface of the electrode assembly to achieve insulation between the electrode assembly and the housing. The second insulating member is usually connected to the boss of the first insulating member connected to the first wall. In a battery cell, under the action of the gravity of the electrode assembly, the second insulating member will generate a pulling force on the first insulating member along the thickness direction of the first wall toward the electrode assembly. The pulling force of the second insulating member on the first insulating member is likely to cause the first insulating member to fall off the first wall. In this way, the boss of the first insulating member is likely to squeeze the electrode assembly and cause certain damage to the electrode assembly, which seriously affects the reliability of the battery cell.

[0087] In view of this, an embodiment of the present application provides a battery cell, which includes a shell, an electrode assembly, an electrode terminal, a first insulating member and a second insulating member. The shell includes a first wall, the electrode assembly is arranged in the shell, the electrode assembly includes an electrode body and a pole ear, and the pole ear is led out from the end of the electrode body toward the first wall. The electrode terminal is arranged on the first wall, and the electrode terminal is electrically connected to the pole ear. The first insulating member is arranged on the side of the first wall facing the electrode body, the first insulating member has a boss protruding toward the electrode body, the boss is located on one side of the electrode terminal and abuts against the electrode terminal, the boss has a first surface facing the electrode body, and the first surface includes a first inclined surface. The second insulating member is coated on the surface of the electrode body and connected to the side of the boss facing away from the electrode terminal. From the side of the boss close to the second insulating member to the side close to the electrode terminal, the first inclined surface is inclined toward the first wall.

[0088] The battery cell provided in the embodiment of the present application is provided with a first surface of the boss including a first inclined surface. When the second insulating member generates a pulling force toward the electrode body on the boss, the pulling force will generate a component force perpendicular to the first inclined surface. Since the boss and the electrode terminal are against each other, the component force perpendicular to the first inclined surface will be transmitted to the electrode terminal and generate a squeezing force on the electrode terminal. In this way, part of the pulling force generated by the second insulating member on the first insulating member is transmitted to the electrode terminal and borne by the electrode terminal, which is conducive to reducing the pulling force of the first insulating member on the first wall, reducing the risk of the first insulating member falling off the first wall, and further reducing the risk of the boss of the first insulating member squeezing the electrode body and causing damage to the electrode body, which is conducive to improving the reliability of the battery cell.

[0089] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries including battery cells, and electrical devices using batteries.

[0090] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. The battery disclosed in the present application can be used to form a power supply system of the electrical device.

[0091] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0092] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0093] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1 provided in an embodiment of the present application. The vehicle 1 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, etc. A battery 10 is provided inside the vehicle 1, and the battery 10 may be provided at the bottom, the head or the 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, for the circuit system of the vehicle 1, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1.

[0094] The vehicle 1 may further include a controller 1b and a motor 1a, wherein 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 starting, navigating, and driving the vehicle 1.

[0095] In some embodiments of the present application, the battery 10 can be used not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0096] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery 10 provided in the embodiment of the present application. Figure 3 Schematic diagram of the structure of the battery module 20 in the battery 10 provided in an embodiment of the present application. The battery 10 includes a case 11 and a battery cell 30, and the battery cell 30 is accommodated in the case 11. Among them, the case 11 is used to provide a storage space for the battery cell 30, and the case 11 can adopt a variety of structures. In some embodiments, the case 11 may include a first sub-case 111 and a second sub-case 112, the first sub-case 111 and the second sub-case 112 cover each other, and the first sub-case 111 and the second sub-case 112 jointly define a storage space for accommodating the battery cell 30. The second sub-box 112 may be a hollow structure with one end open, and the first sub-box 111 may be a plate-like structure, and the first sub-box 111 covers the open side of the second sub-box 112, so that the first sub-box 111 and the second sub-box 112 jointly define a storage space; the first sub-box 111 and the second sub-box 112 may also be hollow structures both with one side open, and the open side of the first sub-box 111 covers the open side of the second sub-box 112.

[0097] In the battery 10, there may be multiple battery cells 30, and the multiple battery cells 30 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 30 are both connected in series and in parallel. The multiple battery cells 30 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 30 is accommodated in the box 11; of course, the battery 10 may also be a battery module 20 in the form of multiple battery cells 30 connected in series, in parallel, or in a mixed connection, and then the multiple battery modules 20 are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 11. The battery 10 may also include other structures, for example, the battery 10 may also include a busbar component for realizing electrical connection between the multiple battery cells 30.

[0098] The battery cell 30 may be a secondary battery or a primary battery; the battery cell 30 may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0099] Please refer to Figure 4 , Figure 4 Schematic diagram of the explosion structure of the battery cell 30 provided in the embodiment of the present application. Figure 4 As shown, the battery cell 30 includes a housing 31, an electrode assembly 32 and an electrode terminal 33. The housing 31 includes a shell 311 and an end cap 312. The shell 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0100] The shell 311 is a component used to cooperate with the end cap 312 to form the internal environment of the battery cell 30, wherein the formed internal environment can be used to accommodate the electrode assembly 32, the electrolyte and other components. The shell 311 and the end cap 312 can be independent components. The shell 311 can be of various shapes and sizes. Specifically, the shape of the shell 311 can be determined according to the specific shape and size of the electrode assembly 32. The material of the shell 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0101] The end cap 312 refers to a component that covers the opening of the shell 311 to isolate the internal environment of the battery cell 30 from the external environment. Without limitation, the shape of the end cap 312 can be adapted to the shape of the shell 311 to match the shell 311. Optionally, the end cap 312 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 312 is not easily deformed when squeezed and collided, so that the battery cell 30 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals 33 can be provided on the end cap 312. The electrode terminal 33 can be used to electrically connect to the electrode assembly 32 for outputting or inputting electrical energy of the battery cell 30. The material of the end cap 312 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating structure may be provided inside the end cap 312, and the insulating structure may be used to isolate the electrical connection components in the housing 311 from the end cap 312 to reduce the risk of short circuit. For example, the insulating structure may be plastic, rubber, or the like.

[0102] The electrode assembly 32 is a component in the battery cell 30 where an electrochemical reaction occurs. One or more electrode assemblies 32 may be included in the housing 311. The electrode assembly 32 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet, and the separator is used to separate the positive electrode sheet and the negative electrode sheet to reduce the risk of internal short circuit between the positive electrode sheet and the negative electrode sheet. The portion of the positive electrode sheet and the negative electrode sheet with active material constitutes the electrode body 321 of the electrode assembly 32, and the portion of the positive electrode sheet and the negative electrode sheet without active material each constitutes a tab 322. The positive tab and the negative tab may be located together at one end of the electrode body 321 or at both ends of the electrode body 321. During the charge and discharge process of the battery cell 30, the positive active material and the negative active material react with the electrolyte, and the tab 322 connects the electrode terminal 33 to form a current loop.

[0103] First, as Figure 4 , Figure 5 and Figure 6As shown, the battery cell 30 provided in the embodiment of the present application includes a shell 31, an electrode assembly 32, an electrode terminal 33, a first insulating member 34 and a second insulating member 35. The shell 31 includes a first wall 313, and the electrode assembly 32 is arranged in the shell 31. The electrode assembly 32 includes an electrode body 321 and a pole ear 322. The pole ear 322 is led out from the end of the electrode body 321 toward the first wall 313. The electrode terminal 33 is arranged on the first wall 313, and the electrode terminal 33 is electrically connected to the pole ear 322. The first insulating member 34 is arranged on a side of the first wall 313 facing the electrode body 321. The first insulating member 34 has a boss 341 protruding toward the electrode body 321. The boss 341 is located on one side of the electrode terminal 33 and abuts against the electrode terminal 33. The boss 341 has a first surface 3411 facing the electrode body 321, and the first surface 3411 includes a first inclined surface 3411a. The second insulating member 35 covers the surface of the electrode body 321 and is connected to the side of the boss 341 facing away from the electrode terminal 33. From the side of the boss 341 close to the second insulating member 35 to the side close to the electrode terminal 33, the first inclined surface 3411a is inclined toward the first wall 313.

[0104] The housing 31 includes a first wall 313 . Optionally, the first wall 313 may be at least a portion of an end cover 312 of the housing 31 , or the first wall 313 may be a portion of a shell 311 of the housing 31 .

[0105] Optionally, the housing 31 may include one or two first walls 313 .

[0106] The electrode assembly 32 includes an electrode body 321 and a pole ear 322 . The pole ear 322 is led out from the end of the electrode body 321 toward the first wall 313 . Optionally, the pole ear 322 is led out from one end of the electrode body 321 , or different pole ears 322 are provided and led out from different ends of the electrode body 321 .

[0107] The electrode terminal 33 is disposed on the first wall 313 , and the electrode terminal 33 can penetrate the first wall 313 and be sealed and connected to the first wall 313 by riveting or other processes.

[0108] The electrode terminal 33 is electrically connected to the tab 322, and the electrode assembly 32 is charged or discharged through the electrode terminal 33. Optionally, the electrode terminal 33 can be directly connected to the tab 322 by welding or other processes, or the electrode terminal 33 can be electrically connected to the tab 322 through a conductive member.

[0109] The first insulating member 34 is disposed on a side of the first wall 313 facing the electrode body 321, so that the first wall 313 and the electrode body 321 are insulated from each other by the first insulating member 34. The first insulating member 34 can be connected to the first wall 313 by a process such as heat-melting connection.

[0110] The first insulating member 34 has a boss 341 protruding toward the electrode body 321. The boss 341 can be set at the end of the first insulating member 34. The boss 341 can be abutted against the end of the electrode body 321, or the boss 341 can be set at a preset distance from the electrode body 321, so that when the battery cell 30 shakes, the boss 341 can provide a certain limiting effect on the electrode assembly 32.

[0111] Optionally, the first insulating member 34 may be provided with one boss 341 , or the first insulating member 34 may be provided with two bosses 341 located at two ends of the first insulating member 34 , and the two bosses 341 may be respectively abutted against different electrode terminals 33 .

[0112] The boss 341 is against the electrode terminal 33, and in the initial state, the boss 341 may only be in contact with the electrode terminal 33, but there is no force between the two. In the subsequent use of the battery cell 30, as the second insulating member 35 exerts a pulling force on the first insulating member 34 along the thickness direction of the first wall 313 toward the electrode body 321, the boss 341 exerts a squeezing force on the electrode terminal 33. Of course, in the initial state, the boss 341 may also exert a squeezing force on the electrode terminal 33.

[0113] The boss 341 has a first surface 3411 facing the electrode body 321, and the first surface 3411 includes a first inclined surface 3411a. Optionally, a portion of the first surface 3411 can be set as the first inclined surface 3411a, or the first surface 3411 can be set as the first inclined surface 3411a. The selection can be made according to actual needs. In the case where a portion of the first surface 3411 is the first inclined surface 3411a, the first inclined surface 3411a can be set to be located on a side of the first surface 3411 close to the electrode terminal 33, or the first inclined surface 3411a can be set to be located on a side of the first surface 3411 close to the second insulating member 35, or the first inclined surface 3411a can be set to be located in the middle area of ​​the first surface 3411 between the electrode terminal 33 and the second insulating member 35.

[0114] Optionally, the first inclined surface 3411a may be inclined in a curved shape, or the first inclined surface 3411a may be straight, or a portion of the first inclined surface 3411a may be straight and another portion may be curved.

[0115] The second insulating member 35 is coated on the surface of the electrode body 321 and connected to the side of the boss 341 facing away from the electrode terminal 33. The second insulating member 35 can protrude from the end of the electrode body 321 facing the pole ear 322, and the protruding part is connected to the side of the boss 341 facing away from the electrode terminal 33 by hot melt connection or the like.

[0116] When the battery cell 30 is placed in the forward direction, that is, the tab 322 of the electrode assembly 32 is placed upward along the gravity direction, the gravity of the electrode assembly 32 itself will generate a force on the second insulating member 35 that is back to the first wall 313, and the second insulating member 35 will be pulled to generate a pulling force F on the boss 341 of the first insulating member 34 that is back to the first wall 313, as shown in FIG. Figure 7 As shown, due to the existence of the first inclined surface 3411a, the pulling force F will generate a component force F1 in a direction perpendicular to the first inclined surface 3411a. Since the boss 341 is against the electrode terminal 33, the component force F1 will generate an extrusion component force F11 perpendicular to the surface of the electrode terminal 33 on the electrode terminal 33. In this way, a portion of the pulling force F generated by the second insulating member 35 on the boss 341 of the first insulating member 34 that is back to the first wall 313 will be borne by the electrode terminal 33, which is beneficial to reduce the risk of the boss 341 detaching from the first wall 313 and squeezing the electrode body 321.

[0117] The battery cell 30 provided in the embodiment of the present application is provided with a first surface 3411 of the boss 341 including a first inclined surface 3411a. When the second insulating member 35 generates a pulling force toward the electrode body 321 on the boss 341, the pulling force will generate a component force perpendicular to the first inclined surface 3411a. Since the boss 341 abuts against the electrode terminal 33, the component force perpendicular to the first inclined surface 3411a will be transmitted to the electrode terminal 33 and generate a pressing force on the electrode terminal 33. In this way, part of the pulling force generated by the second insulating member 35 on the first insulating member 34 is transmitted to the electrode terminal 33 and borne by the electrode terminal 33, which is conducive to reducing the pulling force of the first insulating member 34 on the first wall 313, reducing the risk of the first insulating member 34 falling off from the first wall 313, and further reducing the risk of the boss 341 of the first insulating member 34 squeezing the electrode body 321 and causing damage to the electrode body 321, which is conducive to improving the reliability of the battery cell 30.

[0118] In some embodiments, Figure 6 and Figure 7 As shown, the first inclined surface 3411a is straight.

[0119] It can be understood that the magnitude and direction of the component force F1 generated by the tension F along the inclined surface perpendicular to the first wall 313 are related to the inclination angle of the first inclined surface 3411a. If the first inclined surface 3411a is set to be straight, the inclination angle of the first inclined surface 3411a is fixed, and the magnitude and direction of the component force F1 generated by the tension F along the inclined surface perpendicular to the first wall 313 are relatively stable. In this way, it is convenient to set the magnitude of the extrusion force borne by the electrode terminal 33 by reasonably setting the inclination angle of the first inclined surface 3411a, and it is convenient for the tension F borne by the boss 341 to be more stably and fully transmitted to the electrode terminal 33, so that the electrode terminal 33 can more stably resist the extrusion force of the boss 341, which is further beneficial to reduce the risk of the boss 341 falling off the first wall 313.

[0120] In some embodiments, Figure 6 and Figure 7 As shown, the first surface 3411 further includes a flat surface 3411 b , and the flat surface 3411 b is perpendicular to the thickness direction of the first wall 313 .

[0121] The first surface 3411 includes a flat surface 3411 b , which not only transmits the component force F1 to the electrode terminal 33 through the first inclined surface 3411 a , but also helps to improve the structural strength of the boss 341 and facilitates the manufacturing process of the boss 341 .

[0122] In some embodiments, Figure 6 and Figure 7 As shown, the first inclined surface 3411 a is located on a side of the flat surface 3411 b close to the electrode terminal 33 .

[0123] In this way, the pulling force F generated by the second insulating member 35 on the boss 341 against the first wall 313 generates a component force F1 perpendicular to the first inclined surface 3411a when it is transmitted to the first inclined surface 3411a. Since the first inclined surface 3411a is located on the side of the flat surface close to the electrode terminal 33, F1 is directly transmitted to the electrode terminal 33 and generates an extrusion component force F11 perpendicular to the surface of the electrode terminal 33 on the electrode terminal 33.

[0124] Therefore, setting the first inclined surface 3411a on the side of the flat surface 3411b close to the electrode terminal 33 makes it easier for the second insulating member 35 to transfer the pulling force F on the boss 341 to the electrode terminal 33 via the first inclined surface 3411a, and generate an extrusion component force F11 perpendicular to the surface of the electrode terminal 33, which is beneficial to improving the stability and reliability of the electrode terminal 33 in bearing the force, and further helps to reduce the risk of the boss 341 falling off the first wall 313.

[0125] Optionally, the boss 341 of the first insulating member 34 may be a solid structure, or the boss 341 may be a cavity structure, which may be configured according to actual needs.

[0126] In some embodiments, Figure 7 As shown, the boss 341 has a cavity 341 a , and the first inclined surface 3411 a is located on a side of the cavity 341 a facing the electrode body 321 .

[0127] Optionally, the boss 341 may have one or two cavities 341a. The first inclined surface 3411a is located on the side of the cavity 341a facing the electrode body 321, so that the component force F1 of the pulling force F generated by the second insulating member 35 on the boss 341 along the direction perpendicular to the first inclined surface 3411a can be more accurately transmitted to the electrode terminal 33 along the direction perpendicular to the first inclined surface 3411a, so that the electrode terminal 33 can withstand the extrusion component force F11 perpendicular to the surface.

[0128] The boss 341 has a cavity 341a, so when the boss 341 exerts a compressive force on the electrode body 321, the boss 341 can be deformed to play a certain buffering role, which is beneficial to reducing the compressive force of the boss 341 on the electrode body 321, thereby reducing the risk of the boss 341 compressing the electrode body 321. In addition, the boss 341 has a cavity 341a, which can also reduce the weight of the first insulating member 34, which is beneficial to improving the energy density of the battery cell 30.

[0129] In some embodiments, Figure 7 As shown, the included angle α between the first inclined surface 3411 a and a plane perpendicular to the thickness direction of the first wall 313 satisfies: 5°≤α≤45°.

[0130] Optionally, α may be 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40° or 45°, etc.

[0131] It can be understood that F1=F*cosα, and F11=F1*sinα=F*sinα*cosα=(F*sin2α) / 2. It can be seen that the extrusion force F11 borne by the electrode terminal 33 along the direction perpendicular to its own surface is proportional to the sine of 2α. It can be seen that when α=45°, the value of F11 is the largest.

[0132] After systematic analysis and long-term practice, the inventors found that setting 5°≤α≤45° is beneficial to increasing the extrusion force F11 perpendicular to the surface of the electrode terminal 33, reducing the pulling force of the boss 341 on the first wall 313, thereby reducing the risk of the boss 341 detaching from the first wall 313, and facilitating the manufacture of the first inclined surface 3411a.

[0133] In some embodiments, Figure 6 , Figure 7 and Figure 8As shown, the first insulating member 34 further has a protrusion 342 , which is disposed on a side of the boss 341 facing the first wall 313 , and is sandwiched between the first wall 313 and the electrode terminal 33 .

[0134] It can be understood that the pulling force F of the second insulating member 35 on the boss 341 will also generate a component force F2 parallel to the first inclined surface 3411a. This component force F2 acts on the first insulating member 34, generating a pulling force on the first insulating member 34 parallel to the first wall 313 and away from the electrode terminal 33, so that the first insulating member 34 has a tendency to move along the first wall 313 away from the electrode terminal 33.

[0135] By setting the protrusion 342 between the first wall 313 and the electrode terminal 33, the risk of the first insulating member 34 moving relative to the first wall 313 in a direction parallel to the first wall 313 can be limited by the protrusion 342, which is beneficial to improving the structural stability of the battery cell 30 and further improving the reliability of the battery cell 30.

[0136] In some embodiments, Figure 6 , Figure 7 and Figure 8 As shown, the battery cell 30 also includes a transition piece 36, which electrically connects the electrode terminal 33 and the electrode ear 322. The electrode terminal 33 has a second inclined surface 33a facing the electrode body 321. The second inclined surface 33a is inclined relative to a plane perpendicular to the thickness direction of the first wall 313, and at least a portion of the second inclined surface 33a is in contact with the transition piece 36.

[0137] The adapter 36 electrically connects the electrode terminal 33 and the tab 322, and the adapter 36 can transfer electrical energy between the tab 322 and the electrode terminal 33, so as to serve as a current passage during the cyclic charging or discharging process of the battery cell 30. The adapter 36 can be connected to the tab 322 and the electrode terminal 33 respectively by welding or other processes, so as to realize the electrical connection between the tab 322 and the electrode terminal 33.

[0138] The inclination directions of the second inclined surface 33 a and the first inclined surface 3411 a may be the same or different, and the angles between the second inclined surface 33 a and a plane perpendicular to the thickness direction of the first wall 313 may be the same or different.

[0139] At least a portion of the second inclined surface 33 a is in contact with the adapter 36 , and the second inclined surface 33 a and the adapter 36 may be in surface contact, the two may simply abut against each other, or the two may be connected by a welding process.

[0140] The entire second inclined surface 33 a may be arranged to be in contact with the adapter 36 , or only a portion of the second inclined surface 33 a may be arranged to be in contact with the adapter 36 .

[0141] It can be understood that providing the electrode terminal 33 with a second inclined surface 33a facing the electrode body 321 can increase the surface area of ​​the electrode terminal 33 on the side facing the electrode body 321. This is beneficial to increase the connection area between the electrode terminal 33 and the adapter 36, thereby reducing the contact resistance between the adapter 36 and the electrode terminal 33, which is beneficial to reducing the energy loss of the battery cell 30 during the cycle operation and reducing the risk of overheating of the battery cell 30.

[0142] In some embodiments, Figure 6 , Figure 7 and Figure 8 As shown, the adapter 36 abuts against the first inclined surface 3411 a , and the inclination direction of the second inclined surface 33 a is the same as the inclination direction of the first inclined surface 3411 a of the boss 341 abutting against the electrode terminal 33 .

[0143] The battery cell 30 may have two electrode terminals 33 and two bosses 341 , and the second inclined surface 33 a of the electrode terminal 33 is always inclined in the same direction as the first inclined surface 3411 a of the boss 341 abutting against the electrode terminal 33 .

[0144] The second inclined surface 33a and the first inclined surface 3411a have the same inclination direction, so they can be inclined to the same side, that is, from the side where the electrode terminal 33 and the boss 341 abut against each other to the other side, and the second inclined surface 33a is inclined toward the direction of the first wall 313.

[0145] Optionally, the inclination angles of the second inclined surface 33a and the first inclined surface 3411a may be the same or different, that is, the angle between the second inclined surface 33a and the plane perpendicular to the thickness direction of the first wall 313 and the angle between the first inclined surface 3411a and the plane perpendicular to the thickness direction of the first wall 313 may be the same or different.

[0146] Since the adapter 36 abuts against both the first inclined surface 3411a and the second inclined surface 33a, and the first inclined surface 3411a and the second inclined surface 33a are arranged in the same inclination direction, the inclination directions of the parts of the adapter 36 that abut against the first inclined surface 3411a and the second inclined surface 33a are also the same, which facilitates the implementation of the fool-proof effect of the adapter 36 during the assembly process, and is beneficial to increase the matching area between the adapter 36 and the first inclined surface 3411a and the second inclined surface 33a, thereby improving the structural stability of the adapter 36 and facilitating the manufacturing and processing of the adapter 36.

[0147] In some embodiments, Figure 6 , Figure 7 and Figure 8As shown, the second inclined surface 33 a is parallel to the first inclined surface 3411 a of the boss 341 abutting against the electrode terminal 33 .

[0148] The second inclined surface 33a is parallel to the first inclined surface 3411a, and the angle between the second inclined surface 33a and the plane perpendicular to the thickness direction of the first wall 313 is the same as the angle between the first inclined surface 3411a and the plane perpendicular to the thickness direction of the first wall 313.

[0149] It should be noted that the “parallel” in the description of the embodiments of the present application does not necessarily mean absolute parallelism, but rather allows a certain parallelism error between the two.

[0150] In this way, the parts of the adapter 36 that cooperate with the first inclined surface 3411a and the second inclined surface 33a are parallel to each other, which can not only realize the fool-proof effect of the adapter 36 during the assembly process, but also help reduce the process difficulty during the manufacturing process of the adapter 36.

[0151] In some embodiments, Figure 6 , Figure 7 and Figure 8 As shown, the adapter 36 has a terminal connection surface 36a and a first matching surface 36b, the terminal connection surface 36a is parallel to the second inclined surface 33a and abuts against the second inclined surface 33a, and the first matching surface 36b is parallel to the first inclined surface 3411a and abuts against the first inclined surface 3411a.

[0152] Setting the terminal connection surface 36a of the adapter 36 parallel to the second inclined surface 33a, and the first mating surface 36b parallel to the first inclined surface 3411a is beneficial to increasing the mating area between the adapter 36 and the electrode terminal 33 and the boss 341 respectively, which is beneficial to further reducing the contact resistance between the adapter 36 and the electrode terminal 33 and improving the structural stability of the adapter 36.

[0153] In some embodiments, the first insulating member 34 also has a third inclined surface 34a, which is located on the side of the electrode terminal 33 facing away from the boss 341 and is parallel to the first inclined surface 3411a. The adapter 36 also has a second mating surface 36c, which is parallel to the third inclined surface 34a and abuts against the third inclined surface 34a.

[0154] Optionally, the inclination direction of the third inclined surface 34 a may be set to be the same as the inclination direction of the second inclined surface 33 a , so as to facilitate the manufacturing process of the adapter 36 .

[0155] In this way, the first mating surface 36b and the second mating surface 36c are respectively located on both sides of the terminal connecting surface 36a, and the second mating surface 36c is against the third inclined surface 34a. This is beneficial to further increase the mating area between the adapter 36 and the first insulating component 34, further improve the stability of the mating between the adapter 36 and the first insulating component 34, and thus improve the reliability performance of the battery cell 30.

[0156] In a second aspect, the battery 10 provided in the embodiment of the present application includes the battery cell 30 provided in any of the above embodiments.

[0157] 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.

[0158] In a third aspect, the electrical device provided in the embodiment of the present application includes the battery 10 provided in the above embodiment, and the battery 10 is used to provide electrical energy.

[0159] The electric device provided in the embodiment of the present application has the same technical effect as the battery 10 provided in the above embodiment, and thus will not be described in detail here.

[0160] In some embodiments, Figures 4 to 8As shown, the battery cell 30 includes a housing 31, an electrode assembly 32, a first insulating member 34, a second insulating member 35 and a transition member 36. The housing 31 includes a first wall 313, the electrode assembly 32 is disposed in the housing 31, the electrode assembly 32 includes an electrode body 321 and a tab 322, and the tab 322 is led out from the electrode body 321 toward the end of the first wall 313. The electrode terminal 33 is disposed on the first wall 313, and the transition member 36 electrically connects the electrode terminal 33 and the tab 322. The first insulating member 34 is disposed on the side of the first wall 313 facing the electrode body 321. The first insulating member 34 has a protrusion 342 and a boss 341 protruding toward the electrode body 321. The boss 341 is located on one side of the electrode terminal 33 and abuts against the electrode terminal 33. The boss 341 has a first surface 3411 facing the electrode body 321. The first surface 3411 includes a flat surface 3411b and a first inclined surface 3411a. The flat surface 3411b is perpendicular to the thickness direction of the first wall 313. The first inclined surface 3411a is located on the side of the flat surface 3411b close to the electrode terminal 33. The protrusion 342 is disposed on the side of the boss 341 facing the first wall 313. The protrusion 342 is sandwiched between the first wall 313 and the electrode terminal 33. The boss 341 has a cavity 341a. The first inclined surface 3411a is located on the side of the cavity 341a facing the electrode body 321. The second insulating member 35 is coated on the surface of the electrode body 321 and connected to the side of the boss 341 facing away from the electrode terminal 33. From the side of the boss 341 close to the second insulating member 35 to the side close to the electrode terminal 33, the first inclined surface 3411a is inclined toward the first wall 313. The angle α between the first inclined surface 3411a and the plane perpendicular to the thickness direction of the first wall 313 satisfies: 5°≤α≤45°. The first insulating member 34 also has a third inclined surface 34a, which is located on the side of the electrode terminal 33 facing away from the boss 341 and is parallel to the first inclined surface 3411a. The electrode terminal 33 has a second inclined surface 33a facing the electrode body 321, and the second inclined surface 33a is parallel to the first inclined surface 3411a of the boss 341 that abuts against the electrode terminal 33. The connector has a terminal connecting surface 36a, a first mating surface 36b and a second mating surface 36c. The terminal connecting surface 36a is parallel to the second inclined surface 33a and abuts against the second inclined surface 33a. The first mating surface 36b is parallel to the first inclined surface 3411a and abuts against the first inclined surface 3411a. The second mating surface 36c is parallel to the third inclined surface 34a and abuts against the third inclined surface 34a.

[0161] The battery cell 30 provided in the embodiment of the present application is provided with a first surface 3411 of the boss 341 including a first inclined surface 3411a. When the second insulating member 35 generates a pulling force toward the electrode body 321 on the boss 341, the pulling force will generate a component force perpendicular to the first inclined surface 3411a. Since the boss 341 abuts against the electrode terminal 33, the component force perpendicular to the first inclined surface 3411a will be transmitted to the electrode terminal 33 and generate a pressing force on the electrode terminal 33. In this way, part of the pulling force generated by the second insulating member 35 on the first insulating member 34 is transmitted to the electrode terminal 33 and borne by the electrode terminal 33, which is conducive to reducing the pulling force of the first insulating member 34 on the first wall 313, reducing the risk of the first insulating member 34 falling off from the first wall 313, and further reducing the risk of the boss 341 of the first insulating member 34 squeezing the electrode body 321 and causing damage to the electrode body 321, which is conducive to improving the reliability of the battery cell 30.

[0162] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing including a first wall; An electrode assembly is disposed in the housing, the electrode assembly comprising an electrode body and a pole ear, the pole ear is led out from the end of the electrode body toward the first wall; An electrode terminal, disposed on the first wall, the electrode terminal being electrically connected to the tab; A first insulating member is provided on a side of the first wall facing the electrode body, the first insulating member has a boss protruding toward the electrode body, the boss is located on one side of the electrode terminal and abuts against the electrode terminal, the boss has a first surface facing the electrode body, and the first surface includes a first inclined surface; A second insulating member, covering the surface of the electrode body and connected to a side of the boss facing away from the electrode terminal; From the side of the boss close to the second insulating member to the side close to the electrode terminal, the first inclined surface is inclined toward the first wall.

2. The battery cell according to claim 1, characterized in that: The first inclined surface is straight.

3. The battery cell according to claim 1, characterized in that: The first surface further includes a flat surface, and the flat surface is perpendicular to a thickness direction of the first wall.

4. The battery cell according to claim 3, characterized in that: The first inclined surface is located on a side of the flat surface close to the electrode terminal.

5. The battery cell according to claim 1, characterized in that: The boss has a cavity, and the first inclined surface is located on a side of the cavity facing the electrode body.

6. The battery cell according to claim 1, characterized in that: An included angle α between the first inclined surface and a plane perpendicular to the thickness direction of the first wall satisfies: 5°≤α≤45°.

7. The battery cell according to claim 1, characterized in that: The first insulating member further has a protrusion, which is arranged on a side of the boss facing the first wall, and the protrusion is sandwiched between the first wall and the electrode terminal.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The battery cell also includes a converter, which electrically connects the electrode terminal and the electrode lug. The electrode terminal has a second inclined surface facing the electrode body. The second inclined surface is inclined relative to a plane perpendicular to the thickness direction of the first wall. At least a portion of the second inclined surface is in contact with the converter.

9. The battery cell according to claim 8, characterized in that: The adapter is against the first inclined surface, and the inclination direction of the second inclined surface is the same as the inclination direction of the first inclined surface of the boss against the electrode terminal.

10. The battery cell according to claim 9, characterized in that: The second inclined surface is parallel to the first inclined surface of the boss abutting against the electrode terminal.

11. The battery cell according to claim 8, characterized in that: The adapter has a terminal connection surface and a first matching surface, wherein the terminal connection surface is parallel to the second inclined surface and abuts against the second inclined surface, and the first matching surface is parallel to the first inclined surface and abuts against the first inclined surface.

12. The battery cell according to claim 11, characterized in that: The first insulating member also has a third inclined surface, which is located on the side of the electrode terminal facing away from the boss and is parallel to the first inclined surface. The adapter also has a second mating surface, which is parallel to the third inclined surface and abuts against the third inclined surface.

13. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 12.

14. An electrical device, characterized in that: Comprising a battery as claimed in claim 13, the battery is used to provide electrical energy.

Images