Battery cells, batteries and electrical devices

Abstract

The present application provides a battery cell, a battery, and an electrical device. The battery cell includes a shell, an electrode assembly, a first insulating member, and a second insulating member. The shell includes a first wall. The electrode assembly is disposed in the shell. The first insulating member is connected to the side of the first wall facing the electrode assembly. The first insulating member includes an insulating body, a boss, and a first clamping portion. The boss is connected to the end of the insulating body. The first clamping portion is connected to the side of the boss facing away from the insulating body. The first clamping portion is clamped and connected to the first wall. The second insulating member is coated on the outer surface of the electrode assembly and connected to the side of the boss close to the clamping portion. The battery cell provided by the present application is conducive to improving the connection strength between the first insulating member and the first wall, reducing the risk of the boss of the first insulating member falling off from the first wall, thereby reducing the risk of the boss causing a certain degree of compression on the electrode assembly and damaging the electrode assembly, 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 by the embodiment of the present application includes a shell, an electrode assembly, a first insulating member and a second insulating member, the shell includes a first wall, the electrode assembly is arranged in the shell, the first insulating member is connected to the side of the first wall facing the electrode assembly, the first insulating member includes an insulating body, a boss and a first clamping part, the boss is connected to the end of the insulating body, the first clamping part is connected to the side of the boss facing away from the insulating body, and the first clamping part is clamped and connected to the first wall. The second insulating member is coated on the outer surface of the electrode assembly and connected to the side of the boss close to the clamping part.

[0007] The battery cell provided in the embodiment of the present application is beneficial to improving the connection strength between the first insulating member and the first wall, reducing the risk of the boss of the first insulating member falling off the first wall, and further reducing the risk of the boss causing certain squeezing of the electrode assembly and damaging the electrode assembly, which is beneficial to improving the reliability performance of the battery cell.

[0008] According to some embodiments of the present application, the first wall includes a wall body and a second clamping portion, the second clamping portion is arranged on the side of the wall body facing the electrode assembly, one of the second clamping portion and the first clamping portion has a groove, and the other has a convex portion, and the convex portion is clamped in cooperation with the groove.

[0009] In the above scheme, the clamping connection between the first clamping part and the second clamping part is achieved through the cooperation between the protrusion and the groove, which is beneficial to simplify the structure of the clamping connection between the first clamping part and the first part, and is beneficial to improve the strength of the clamping connection between the first clamping part and the first wall.

[0010] According to some embodiments of the present application, the second clamping portion has a groove, the opening of the groove is arranged toward the boss, and the first clamping portion includes a convex portion, and the convex portion is clamped and matched with the groove.

[0011] In the above scheme, the first clamping part has a convex part, and the second clamping part has a groove, and the opening of the groove is arranged toward the boss, which is beneficial to further improve the reliability of the clamping connection between the first clamping part and the first wall and to simplify the manufacturing process of the battery cell.

[0012] According to some embodiments of the present application, the protrusion is adhesively connected to the wall of the groove.

[0013] In the above scheme, the protrusion is bonded to the wall of the groove, and the protrusion and the groove are both bonded and snapped together, which is beneficial to further improve the connection strength between the protrusion and the groove, further reduce the risk of the boss falling off the first wall, and is beneficial to further improve the reliability of the battery cell.

[0014] According to some embodiments of the present application, the first wall has a through hole, the first clamping portion includes a first sub-portion and a second sub-portion, the second sub-portion is bent relative to the first sub-portion, the first sub-portion is connected to the boss and passed through the through hole, and the second sub-portion is connected to the side of the first wall facing away from the electrode assembly.

[0015] In the above solution, it is helpful to improve the reliability of the clamping connection between the first clamping portion and the first wall, and further helpful to reduce the risk of the boss detaching from the first wall and causing a certain degree of compression on the electrode assembly.

[0016] According to some embodiments of the present application, the boss has a hollow cavity.

[0017] In the above scheme, the hollow cavity can reduce the weight of the first insulating member, and when the boss abuts the electrode assembly, the existence of the hollow cavity can enable the boss to buffer the squeezing force of the boss on the electrode assembly through its own deformation, thereby reducing the risk of the boss causing certain damage to the electrode assembly due to squeezing the electrode assembly.

[0018] According to some embodiments of the present application, the first insulating member includes two bosses, the two bosses are respectively connected to the two ends of the insulating body, the two first clamping parts are respectively connected to the side of the two bosses facing away from the insulating body, and the two first clamping parts are respectively clamped and connected to the first wall.

[0019] In the above scheme, it is beneficial to further improve the connection strength between the boss and the first wall, reduce the risk of either end of the first insulating member falling off from the first wall and causing the boss to squeeze the electrode assembly, and further reduce the risk of the boss squeezing the electrode assembly.

[0020] According to some embodiments of the present application, the boss is connected to the first wall by heat melting.

[0021] In the above scheme, providing a hot-melt connection between the boss and the first wall is beneficial to further improve the connection strength between the boss and the first wall, reduce the risk of the boss falling off the first wall, and simplify the connection process between the boss and the first wall.

[0022] According to some embodiments of the present application, the insulating body is connected to the first wall by thermal melting.

[0023] In the above scheme, setting a hot-melt connection between the insulating body and the first wall is beneficial to improving the connection strength between the insulating body and the first wall, reducing the risk of the insulating body falling off the first wall, and simplifying the connection process between the first insulating member and the first wall.

[0024] According to some embodiments of the present application, the electrode assembly includes an electrode body and a pole ear, the pole ear is led out from the end of the electrode body, and the boss abuts against the electrode body.

[0025] In the above scheme, the boss can provide a certain limiting effect on the electrode body, which is beneficial to reduce the risk of the electrode assembly shaking inside the battery cell and is beneficial to further improve the reliability of the battery cell.

[0026] 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.

[0027] 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 will not be described in detail here.

[0028] In a third aspect, the electrical device provided in the embodiments of the present application includes the battery cell or battery provided in any of the above embodiments, and the battery is used to provide electrical energy.

[0029] 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.

[0030] 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

[0031] 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.

[0032] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0034] Figure 3 A schematic diagram of the structure of a battery module in a battery provided in an embodiment of the present application;

[0035] Figure 4 A schematic diagram of the explosion structure of a battery cell provided in an embodiment of the present application;

[0036] Figure 5 A front view of a battery cell provided in an embodiment of the present application;

[0037] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure along AA;

[0038] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0039] Figure 8 A schematic diagram of the structure of a portion of a battery cell provided in an embodiment of the present application.

[0040] In the drawings, the figures are not necessarily drawn to scale.

[0041] Description of reference numerals:

[0042] 1- Vehicle;

[0043] 10-battery; 111-first sub-box; 112-second sub-box; 11-box; 1a-motor; 1b-controller;

[0044] 20-battery module;

[0045] 30 - battery cell; 31 - shell; 311 - housing; 312 - end cover; 313 - first wall; 313a - through hole; 3131 - wall body; 3132 - second clamping portion; 3132a - groove;

[0046] 32-electrode assembly; 321-electrode body; 322-electrode ear;

[0047] 33-electrode terminal;

[0048] 34-first insulating member; 341-boss; 341a-hollow cavity; 342-insulating body; 343-first clamping portion; 3431-convex portion; 3432-first sub-portion; 3433-second sub-portion;

[0049] 35- Second insulating member. DETAILED DESCRIPTION

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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).

[0056] 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.

[0057] 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.

[0058] 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.

[0059] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.).

[0066] 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.

[0067] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] In some embodiments, the electrode assembly is a laminate structure.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] In view of this, the embodiment of the present application provides a battery cell, the battery cell includes a shell, an electrode assembly, a first insulating member and a second insulating member, the shell includes a first wall, the electrode assembly is arranged in the shell, the first insulating member is connected to the side of the first wall facing the electrode assembly, the first insulating member includes an insulating body, a boss and a first clamping portion, the boss is connected to the end of the insulating body, the first clamping portion is connected to the side of the boss facing away from the insulating body, and the first clamping portion is clamped and connected to the first wall. The second insulating member is coated on the outer surface of the electrode assembly and connected to the side of the boss close to the clamping portion.

[0083] The battery cell provided in the embodiment of the present application is beneficial to improving the connection strength between the first insulating member and the first wall, reducing the risk of the boss of the first insulating member falling off the first wall, and further reducing the risk of the boss causing certain squeezing of the electrode assembly and damaging the electrode assembly, which is beneficial to improving the reliability performance of the battery cell.

[0084] 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.

[0085] 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.

[0086] The embodiment of the present application provides an electric device using a battery 10 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.

[0087] For the convenience of description, the following embodiments are described by taking a vehicle 1 as an example of an electrical device in an embodiment of the present application.

[0088] 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.

[0089] 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.

[0090] 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 .

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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, a first insulating member 34 and a second insulating member 35. The shell 31 includes a first wall 313. The electrode assembly 32 is arranged in the shell 31. The first insulating member 34 is connected to the side of the first wall 313 facing the electrode assembly 32. The first insulating member 34 includes an insulating body 342, a boss 341 and a first clamping portion 343. The boss 341 is connected to the end of the insulating body 342. The first clamping portion 343 is connected to the side of the boss 341 facing away from the insulating body 342. The first clamping portion 343 is clamped and connected to the first wall 313. The second insulating member 35 is coated on the outer surface of the electrode assembly 32 and connected to the side of the boss 341 close to the clamping portion.

[0099] 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 .

[0100] Optionally, the housing 31 may include one or two first walls 313 .

[0101] The first insulating member 34 is connected to the side of the first wall 313 facing the electrode body 321, so that the first wall 313 and the electrode assembly 32 are insulated from each other by the first insulating member 34. The insulating body 342 and the boss 341 of the first insulating member 34 can be connected to the first wall 313 by a process such as heat fusion connection.

[0102] Optionally, the insulating body 342 , the boss 341 and the first clamping portion 343 may be integrally formed.

[0103] 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 connected to two ends of the insulating body 342 .

[0104] In the embodiment where the first insulating member 34 has two bosses 341, the first insulating member 34 may have a first clamping portion 343, and the first clamping portion 343 may be connected to a side of any boss 341 facing away from the insulating body 342. Alternatively, the first insulating member 34 may have two first clamping portions 343, and the two first clamping portions 343 may be connected to a side of two bosses 341 facing away from the insulating body 342, which may be specifically arranged according to actual needs.

[0105] The first clamping portion 343 is clamped and connected to the first wall 313 , and the specific form of the clamping connection between the first clamping portion 343 and the first wall 313 can be set according to actual needs.

[0106] 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. The second insulating member 35 can protrude from the end of the electrode assembly 32 facing the first wall 313, and the protruding part is connected to the side of the boss 341 facing away from the insulating body 342 by hot melt connection or the like.

[0107] When the battery cell 30 is placed in the forward direction, that is, the first wall 313 of the housing 31 is arranged upward along the direction of gravity, the gravity of the electrode assembly 32 itself will generate a force on the second insulating member 35 to move away from the first wall 313, and pull the second insulating member 35 to generate a pulling force on the boss 341 of the first insulating member 34 to move away from the first wall 313. Since the first clamping portion 343 is connected to the side of the boss 341 that is away from the insulating body 342, the first clamping portion 343 and the second insulating member 35 are located on the same side of the boss 341. When the second insulating member 35 generates a pulling force on the boss 341 to move away from the first wall 313, the first clamping portion 343 will also generate a pulling force on the boss 341 to move toward the first wall 313 on the same side of the boss 341, which is conducive to reducing the risk of the boss 341 detaching from the first wall 313.

[0108] The battery cell 30 provided in the embodiment of the present application is beneficial to improving the connection strength between the first insulating member 34 and the first wall 313, reducing the risk of the boss 341 of the first insulating member 34 falling off from the first wall 313, and further reducing the risk of the boss 341 causing certain squeezing of the electrode assembly 32 and damaging the electrode assembly 32, which is beneficial to improving the reliability performance of the battery cell 30.

[0109] In some embodiments, Figure 6 and Figure 7 As shown, the first wall 313 includes a wall body 3131 and a second clamping portion 3132. The second clamping portion 3132 is arranged on the side of the wall body 3131 facing the electrode assembly 32. One of the second clamping portion 3132 and the first clamping portion 343 has a groove 3132a, and the other has a convex portion 3431. The convex portion 3431 is clamped and matched with the groove 3132a.

[0110] Optionally, the second clamping portion 3132 may be integrally formed with the wall body 3131 , or the second clamping portion 3132 and the wall body 3131 may be formed separately and then connected together.

[0111] Optionally, the second clamping portion 3132 may have a groove 3132a and the first clamping portion 343 may have a convex portion 3431 , or the second clamping portion 3132 may have a convex portion 3431 and the first clamping portion 343 may have a groove 3132a .

[0112] By cooperating between the protrusion 3431 and the groove 3132a, the first clamping portion 343 and the second clamping portion 3132 are clamped together, which is beneficial to simplifying the structure of the clamping connection between the first clamping portion 343 and the first part, and is beneficial to improving the strength of the clamping connection between the first clamping portion 343 and the first wall 313.

[0113] In some embodiments, Figure 6 and Figure 7 As shown, the second clamping portion 3132 has a groove 3132a, the opening of the groove 3132a is arranged toward the boss 341, and the first clamping portion 343 includes a convex portion 3431, which is clamped and matched with the groove 3132a.

[0114] The first clamping portion 343 includes a convex portion 3431 , and optionally, the convex portion 3431 may be a part of the first clamping portion 343 , or the convex portion 3431 is the entirety of the first clamping portion 343 .

[0115] The opening of the groove 3132a is set toward the boss 341. After the protrusion 3431 is snap-fitted with the groove 3132a, when the boss 341 is subjected to the pulling force of the second insulating member 35 toward the first wall 313, the groove 3132a can generate a pulling force on the wall body 3131 of the first wall 313 on the protrusion 3431, and the protrusion 3431 then generates a force on the boss 341 toward the first wall 313 to counteract the pressure of the second insulating member 35 on the boss 341.

[0116] The second clamping portion 3132 is provided with a groove 3132a, and the first clamping portion 343 has a convex portion 3431, so as to facilitate the preparation and processing of the groove 3132a.

[0117] Therefore, the first clamping portion 343 is provided with a convex portion 3431, and the second clamping portion 3132 is provided with a groove 3132a, and the opening of the groove 3132a is provided toward the boss 341, which is beneficial to further improve the reliability of the clamping connection between the first clamping portion 343 and the first wall 313, and is beneficial to simplifying the manufacturing process of the battery cell 30.

[0118] In some embodiments, the protrusion 3431 is adhesively connected to the wall of the groove 3132a.

[0119] The protrusion 3431 is bonded and connected to the wall of the groove 3132a. The protrusion 3431 and the groove 3132a are both bonded and snapped together, which helps to further improve the connection strength between the protrusion 3431 and the groove 3132a, further reduce the risk of the boss 341 falling off the first wall 313, and help to further improve the reliability of the battery cell 30.

[0120] In some embodiments, Figure 8 As shown, the first wall 313 has a through hole 313a, the first clamping portion 343 includes a first sub-portion 3432 and a second sub-portion 3433, the second sub-portion 3433 is bent relative to the first sub-portion 3432, the first sub-portion 3432 is connected to the boss 341 and is passed through the through hole 313a, and the second sub-portion 3433 is connected to the side of the first wall 313 facing away from the electrode assembly 32.

[0121] After the first clamping portion 343 passes through the through hole 313a of the first wall 313, the first clamping portion 343 can be bent on the side of the first wall 313 facing away from the electrode assembly 32. The portion of the first clamping portion 343 passing through the through hole 313a is the first sub-portion 3432, and the portion of the first clamping portion 343 located on the side of the first wall 313 facing away from the electrode assembly 32 is the second sub-portion 3433. The second sub-portion 3433 can be connected to the first wall 313 by bonding or hot-melt connection. Of course, the second sub-portion 3433 can also be clamped and connected to the first wall 313 on the side facing away from the electrode assembly 32.

[0122] Such a configuration is beneficial to improving the reliability of the clamping connection between the first clamping portion 343 and the first wall 313 , and further beneficial to reducing the risk of the boss 341 being separated from the first wall 313 and causing a certain degree of compression on the electrode assembly 32 .

[0123] Optionally, the boss 341 may be a solid structure, or the boss 341 may be hollow inside, which can be selected as needed.

[0124] In some embodiments, Figure 7 As shown, the boss 341 has a hollow cavity 341 a.

[0125] The hollow cavity 341a can reduce the weight of the first insulating member 34, and when the boss 341 abuts against the electrode assembly 32, the existence of the hollow cavity 341a can enable the boss 341 to buffer the squeezing force of the boss 341 on the electrode assembly 32 through its own deformation, thereby reducing the risk of the boss 341 causing certain damage to the electrode assembly 32 due to squeezing the electrode assembly 32.

[0126] In some embodiments, Figure 7 As shown, the first insulating member 34 includes two bosses 341, the two bosses 341 are respectively connected to the two ends of the insulating body 342, and the two first clamping portions 343 are respectively connected to the side of the two bosses 341 facing away from the insulating body 342, and the two first clamping portions 343 are respectively clamped and connected to the first wall 313.

[0127] The first insulating member 34 is configured to include two bosses 341, and the second insulating member 35 can be connected to both sides of the two bosses 341, which is beneficial to improving the connection strength between the second insulating member 35 and the first insulating member 34, and the two bosses 341 can provide a certain limiting effect on the electrode assembly 32, thereby reducing problems such as shaking of the electrode assembly 32.

[0128] The two first clamping portions 343 are respectively connected to the side of the two bosses 341 facing away from the insulating body 342. This is beneficial to further improve the connection strength between the boss 341 and the first wall 313, reduce the risk of either end of the first insulating member 34 falling off from the first wall 313 and causing the boss 341 to squeeze the electrode assembly 32, and further reduce the risk of the boss 341 squeezing the electrode assembly 32.

[0129] In some embodiments, the boss 341 is connected to the first wall 313 by heat fusion.

[0130] The hot melt connection has high connection strength and simple process. Setting a hot melt connection between the boss 341 and the first wall 313 is beneficial to further improve the connection strength between the boss 341 and the first wall 313, reduce the risk of the boss 341 falling off the first wall 313, and simplify the connection process between the boss 341 and the first wall 313.

[0131] In some embodiments, the insulating body 342 is connected to the first wall 313 by thermal melting.

[0132] The insulating body 342 is provided with a hot melt connection with the first wall 313, which is beneficial to improving the connection strength between the insulating body 342 and the first wall 313, reducing the risk of the insulating body 342 falling off the first wall 313, and simplifying the connection process between the first insulating member 34 and the first wall 313.

[0133] In some embodiments, Figure 4 and Figure 6 As shown, 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 , and the boss 341 abuts against the electrode body 321 .

[0134] The pole ear 322 can be led out from the end of the electrode body 321 toward the first wall 313, and the boss 341 can be abutted against the electrode body 321. The boss 341 can provide a certain limiting effect on the electrode body 321, which is beneficial to reduce the risk of shaking of the electrode assembly 32 inside the battery cell 30, and is beneficial to further improve the reliability performance of the battery cell 30.

[0135] 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.

[0136] 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.

[0137] In a third aspect, the electrical device provided in the embodiment of the present application includes the battery cell 30 or the battery 10 provided in the above embodiment, and the battery 10 is used to provide electrical energy.

[0138] The electric device provided in the embodiment of the present application has the same technical effect as the battery 10 or the battery cell 30 provided in the above embodiment, and thus will not be described in detail here.

[0139] In some embodiments, Figures 4 to 7 As shown, the battery cell 30 includes a shell 31, an electrode assembly 32, a first insulating member 34 and a second insulating member 35. The shell 31 includes a first wall 313. The electrode assembly 32 is disposed 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, and the boss 341 abuts against the electrode body 321. The first insulating member 34 is connected to the side of the first wall 313 facing the electrode assembly 32. The first insulating member 34 includes an insulating body 342, a boss 341 and a first clamping portion 343. The boss 341 has a hollow cavity 341a. The boss 341 is connected to the first wall 313 by heat melting, and the insulating body 342 is connected to the first wall 313 by heat melting. The boss 341 is connected to the end of the insulating body 342, the first clamping portion 343 is connected to the side of the boss 341 facing away from the insulating body 342, the first wall 313 includes a wall body 3131 and a second clamping portion 3132, the second clamping portion 3132 is arranged on the side of the wall body 3131 facing the electrode assembly 32, the second clamping portion 3132 has a groove 3132a, the opening of the groove 3132a is arranged toward the boss 341, the first clamping portion 343 includes a convex portion 3431, and the convex portion 3431 is clamped and matched with the groove 3132a. The second insulating member 35 is coated on the outer surface of the electrode assembly 32 and connected to the side of the boss 341 close to the clamping portion.

[0140] The battery cell 30 provided in the embodiment of the present application is beneficial to improving the connection strength between the first insulating member 34 and the first wall 313, reducing the risk of the boss 341 of the first insulating member 34 falling off from the first wall 313, and further reducing the risk of the boss 341 causing certain squeezing of the electrode assembly 32 and damaging the electrode assembly 32, which is beneficial to improving the reliability performance of the battery cell 30.

[0141] 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, disposed in the housing; A first insulating member, connected to a side of the first wall facing the electrode assembly, the first insulating member comprising an insulating body, a boss and a first clamping portion, the boss being connected to an end of the insulating body, the first clamping portion being connected to a side of the boss facing away from the insulating body, and the first clamping portion being clamped and connected to the first wall; The second insulating member is coated on the outer surface of the electrode assembly and connected to a side of the boss close to the clamping portion.

2. The battery cell according to claim 1, characterized in that: The first wall includes a wall body and a second clamping portion, wherein the second clamping portion is arranged on a side of the wall body facing the electrode assembly, and one of the second clamping portion and the first clamping portion has a groove, and the other has a convex portion, and the convex portion is clamped and matched with the groove.

3. The battery cell according to claim 2, characterized in that: The second clamping portion has the groove, the opening of the groove is arranged toward the boss, and the first clamping portion includes the convex portion, and the convex portion is clamped and matched with the groove.

4. The battery cell according to claim 3, characterized in that: The protrusion is bonded to the wall of the groove.

5. The battery cell according to claim 1, characterized in that: The first wall has a through hole, the first clamping portion includes a first sub-portion and a second sub-portion, the second sub-portion is bent relative to the first sub-portion, the first sub-portion is connected to the boss and passes through the through hole, and the second sub-portion is connected to the side of the first wall facing away from the electrode assembly.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The boss has a hollow cavity.

7. The battery cell according to any one of claims 1 to 5, characterized in that: The first insulating member includes two bosses, the two bosses are respectively connected to two ends of the insulating body, the two first clamping parts are respectively connected to the side of the two bosses facing away from the insulating body, and the two first clamping parts are respectively clamped and connected to the first wall.

8. The battery cell according to any one of claims 1 to 5, characterized in that: The boss is connected to the first wall by thermal melting, and / or the insulating body is connected to the first wall by thermal melting.

9. The battery cell according to any one of claims 1 to 5, characterized in that: The electrode assembly comprises an electrode body and a pole ear, wherein the pole ear is led out from the end of the electrode body, and the boss abuts against the electrode body.

10. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 8.

11. An electrical device, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 9 or the battery according to claim 10, wherein the battery is used to provide electrical energy.

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