Battery monomer, battery and electric equipment

Abstract

The utility model provides a battery monomer, a battery and electric equipment. The battery monomer comprises a shell, a pressure relief mechanism and an insulating part, the housing has a first wall. The pressure relief mechanism is arranged on the first wall. The insulating part at least partially wraps the outer surface of the first wall, the insulating part comprises a first sub-insulating part and a second sub-insulating part, the first sub-insulating part covers the pressure relief mechanism, and at least part of the second sub-insulating part and the first sub-insulating part are arranged in a spaced mode, so that a gap is formed between the first sub-insulating part and the second sub-insulating part. According to the technical scheme, the reliability of the battery can be improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the development of battery technology, how to improve battery reliability is a technical problem that needs to be solved urgently. Utility Model Content

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

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

[0006] In a first aspect, the present application provides a battery cell, the battery cell comprising a housing, a pressure relief mechanism and an insulating member. The housing has a first wall. The pressure relief mechanism is disposed on the first wall. At least a portion of the insulating member is coated on the outer surface of the first wall, the insulating member comprising a first sub-insulator and a second sub-insulator, the first sub-insulator covers the pressure relief mechanism, and at least a portion of the second sub-insulator is spaced apart from the first sub-insulator to form a gap between the first sub-insulator and the first sub-insulator.

[0007] The technical solution of the embodiment of the present application improves the insulation performance of the battery cell by covering the outer surface of the first wall with an insulating member, and at the same time covers the pressure relief mechanism with the first sub-insulating member, and the first sub-insulating member and the second sub-insulating member are at least partially spaced apart, thereby reducing the risk of the first sub-insulating member affecting the pressure relief of the pressure relief mechanism, thereby improving the reliability of the battery cell, and thus improving the reliability of the battery.

[0008] In some embodiments, the first sub-insulator and the second sub-insulator are spaced apart from each other.

[0009] The technical solution of the embodiment of the present application completely separates the first sub-insulator from the second sub-insulator, further reducing the risk of the first sub-insulator affecting the pressure relief of the pressure relief mechanism and improving the reliability of the battery.

[0010] In some embodiments, the gap has a first width A, satisfying the condition: 0.2 mm ≤ A ≤ 5 mm.

[0011] In the technical solution of the embodiment of the present application, the first width A of the gap meets the above conditions, which facilitates processing and enables the insulating part to have better insulation performance.

[0012] In some embodiments, 0.4 mm ≤ A ≤ 1 mm.

[0013] In the technical solution of the embodiment of the present application, the first width A of the gap meets the above conditions, which further reduces the difficulty of processing and enables the insulating part to have better insulation performance.

[0014] In some embodiments, with the thickness direction of the first wall as the projection direction, the projection of the first sub-insulator covers the projection of the pressure relief mechanism, and there is a first spacing B between the edge of the projection of the first sub-insulator and the edge of the projection of the pressure relief mechanism, satisfying the condition: 0.5mm≤B≤5mm.

[0015] In the technical solution of the embodiment of the present application, the first distance B between the edge of the projected edge of the first sub-insulator and the edge of the projected edge of the pressure relief mechanism meets the above conditions. On the one hand, it reduces the risk of affecting the pressure relief mechanism during processing of the gap, and on the other hand, it also reduces the risk of the first sub-insulator affecting the pressure relief of the pressure relief mechanism, thereby improving the reliability of the battery.

[0016] In some embodiments, 1 mm ≤ B ≤ 2 mm.

[0017] In the technical solution of the embodiment of the present application, the first spacing B meets the above conditions, which further reduces the risk of affecting the pressure relief mechanism when processing the gap, and also reduces the risk of the first sub-insulating member affecting the pressure relief of the pressure relief mechanism, thereby improving the reliability of the battery.

[0018] In some embodiments, the battery cell also includes an end cover, which is provided with a first electrode terminal and a second electrode terminal, and the polarities of the first electrode terminal and the second electrode terminal are opposite; the shell includes a bottom wall and multiple side walls, and the multiple side walls are arranged around the bottom wall, one end of the multiple side walls is connected to the bottom wall, and the other end forms an opening, and the end cover closes the opening.

[0019] The technical solution of the embodiment of the present application realizes the electrical connection between the battery cell and the outside world by providing a first electrode terminal and a second electrode terminal.

[0020] In some embodiments, the first wall is a bottom wall.

[0021] The technical solution of the embodiment of the present application arranges the pressure relief mechanism on the bottom wall, thereby improving the ability of the battery cell to withstand impact force during pressure relief, thereby improving the reliability of the battery cell.

[0022] In some embodiments, the first sub-insulator includes a main body and an identification portion, the main body covers the pressure relief mechanism, and the projection of the identification portion is located on the side of the projection of the main body close to the projection of the first electrode terminal, with the thickness direction of the bottom wall as the projection direction.

[0023] The technical solution of the embodiment of the present application, by setting the identification portion to point to the first electrode terminal, facilitates distinguishing the positions of the first electrode terminal and the second electrode terminal when the battery cells are assembled to form a battery, thereby improving the convenience and efficiency of assembly.

[0024] In some embodiments, a projection of the identification portion protrudes beyond a projection of the main body portion in a direction facing a projection of the first electrode terminal.

[0025] In the technical solution of the embodiment of the present application, the projection of the identification portion protrudes from the projection of the main body, which makes it easy to distinguish the positions of the first electrode terminal and the second electrode terminal, thereby improving the convenience and efficiency of assembly.

[0026] In some embodiments, the pressure relief mechanism includes a weakened portion and a main body portion, the weakened portion is connected to the main body portion, and the maximum thickness of the weakened portion is less than the minimum thickness of the main body portion.

[0027] According to the technical solution of the embodiment of the present application, the maximum thickness of the weak portion is less than the minimum thickness of the main body, so that the pressure relief mechanism can be opened from the weak portion to better achieve pressure relief, thereby improving the reliability of the battery cell.

[0028] In some embodiments, the weak portion is arranged along the circumference of the pressure relief mechanism, and the weak portion has a first end and a second end arranged relatively along the circumference of the pressure relief mechanism. The weak portion is configured to flip around a first axis relative to the main body when the pressure relief mechanism releases pressure, and the first axis is a line connecting the first end and the second end.

[0029] According to the technical solution of the embodiment of the present application, when the pressure relief mechanism releases pressure, the weak portion flips around the first axis to achieve pressure relief, thereby reducing the risk of the pressure relief mechanism detaching from the shell and damaging other components during pressure relief, thereby improving the reliability of the battery.

[0030] In some embodiments, the first sub-insulator also has a connecting portion, which is connected to the second sub-insulator. The projection direction is the thickness direction of the first wall. The projection of the connecting portion is located between the first end and the second end. The projection of the connecting portion does not overlap with the projection of the weak portion, and the projection of the connecting portion covers the first axis.

[0031] According to the technical solution of the embodiment of the present application, the connecting part is connected to the second sub-insulating member, which reduces the processing steps of spacing the first sub-insulating member and the second sub-insulating member and improves the processing efficiency. At the same time, the projection of the connecting part does not overlap with the projection of the weak part, which reduces the risk of the first sub-insulating member affecting the pressure relief of the pressure relief mechanism, improves the reliability of the battery cell, and thus improves the reliability of the battery.

[0032] In a second aspect, the present application further provides a battery, comprising a battery cell according to any one of the embodiments in the first aspect.

[0033] In a third aspect, the present application further provides an electrical device, comprising a battery cell according to any embodiment of the first aspect or a battery according to any embodiment of the second aspect, wherein the battery cell or the battery is used to provide electrical energy.

[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 some embodiments of the present application;

[0037] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0038] Figure 3 An exploded view of a battery cell provided for some embodiments of the present application;

[0039] Figure 4 A schematic diagram of the structure of a housing provided in some embodiments of the present application;

[0040] Figure 5 for Figure 4 Enlarged view of point C in the middle;

[0041] Figure 6 is a schematic diagram of the structure of the first wall in some embodiments;

[0042] Figure 7 Schematic diagram of the structure of the first wall in some other embodiments;

[0043] Figure 8 It is a schematic diagram of the structure of the pressure relief mechanism in some embodiments;

[0044] Fig. 9 Schematic diagram of the structure of the pressure relief mechanism in other embodiments.

[0045] Icons: 1-battery cell; 10-shell; 11-first wall; 12-bottom wall; 13-side wall; 14-opening; 20-pressure relief mechanism; 21-main body; 22-weak part; 221-first end; 222-second end; 223-first axis; 30-insulating member; 31-first sub-insulating member; 311-main body; 312-identification part; 313-connecting part; 32-second sub-insulating member; 40-gap; 50-end cover; 51-electrode terminal; 511-first electrode terminal; 512-second electrode terminal; 60-electrode assembly; 70-shell; 100-battery; 110-box; 120-first sub-box; 130-second sub-box; 1000-vehicle; 1100-controller; 1200-motor; X-thickness direction of the first wall. DETAILED DESCRIPTION

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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).

[0052] 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.

[0053] 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.

[0054] 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.

[0055] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] As an example, the positive 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, nickel, carbon electrode, carbon, nickel or titanium, etc., may 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.).

[0062] 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.

[0063] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0064] 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, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used.

[0065] 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.

[0066] 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.

[0067] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] In some embodiments, the electrode assembly is a laminate structure.

[0072] 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.

[0073] 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.

[0074] 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 an adapter. The electrode terminal may be disposed on the end cap, or may be disposed on the housing.

[0075] In some embodiments, a pressure relief mechanism is provided on the housing, and the pressure relief mechanism is used to release the internal pressure of the battery cell.

[0076] The pressure relief mechanism refers to an element or component that is actuated to release the internal pressure or temperature of the battery cell when the internal pressure or temperature reaches a predetermined threshold. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode plate, negative electrode plate, electrolyte and isolation membrane in the battery cell. The pressure relief mechanism can take the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and can specifically adopt pressure-sensitive or temperature-sensitive elements or structures, that is, when the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism performs an action or the weak structure provided in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0077] The "actuation" mentioned in this application means that the pressure relief mechanism is in action or activated to a certain state, so that the internal pressure and temperature of the battery cell can be released. The action produced by the pressure relief mechanism may include, but is not limited to: at least a part of the pressure relief mechanism is ruptured, broken, torn or opened, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged from the actuated part as emissions. In this way, the battery cell can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0078] At present, from the perspective of market development, batteries have been widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as electric tools, drones, energy storage equipment, etc. With the continuous expansion of battery application areas, the market demand is also constantly expanding.

[0079] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, as environmental conditions and / or battery internal conditions change, battery reliability is also one of the key factors to consider.

[0080] At present, the shell of the battery cell is usually covered with an insulating member to improve the insulation performance of the battery cell. When the pressure relief mechanism is arranged on the shell, the insulating member will cover the pressure relief mechanism, thereby reducing the risk of short circuit between the corresponding part of the pressure relief mechanism and the outside world.

[0081] When actuated, the weak part of the pressure relief mechanism is destroyed to release the pressure and temperature inside the battery cell. However, since the insulating member is wrapped around the outside of the pressure relief mechanism, there is a risk that the insulating member will affect the actuation of the pressure relief mechanism during braking, so a larger pressure threshold is required to actuate the pressure relief mechanism, causing the temperature inside the battery cell to be too high or the pressure to be too high, or the actuation to fail, affecting the reliability of the battery cell.

[0082] Based on the above considerations, in order to solve the problem of low reliability of the battery cell, the embodiment of the present application provides a battery cell, the battery cell includes a shell, a pressure relief mechanism and an insulating member. The insulating member includes a first sub-insulating member and a second sub-insulating member, the first sub-insulating member covers the pressure relief mechanism, and at least a portion of the second sub-insulating member is spaced apart from the first sub-insulating member to form a gap between the first sub-insulating member and the second sub-insulating member.

[0083] The first sub-insulator covers the pressure relief mechanism and at least partially separates the first sub-insulator from the second sub-insulator, thereby reducing the risk of the first sub-insulator affecting the pressure relief of the pressure relief mechanism and improving the reliability of the battery.

[0084] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical equipment 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 equipment.

[0085] 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.

[0086] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in some embodiments of the present application.

[0087] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. Vehicle 1000 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 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0088] The vehicle 1000 may further include a controller 1100 and a motor 1200 , wherein the controller 1100 is used to control the battery 100 to supply power to the motor 1200 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0089] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0090] Please refer to Figure 2 , Figure 2 An exploded view of a battery provided in some embodiments of the present application. The battery 100 may further include a housing 110, in which the battery cell 1 is accommodated. The housing 110 is used to provide a storage space for the battery cell 1, and the housing 110 may adopt a variety of structures. In some embodiments, the housing 110 may include a first sub-housing 120 and a second sub-housing 130, the first sub-housing 120 and the second sub-housing 130 cover each other, and the first sub-housing 120 and the second sub-housing 130 jointly define a storage space for accommodating the battery cell 1. The second sub-box 130 may be a hollow structure with one end open, and the first sub-box 120 may be a plate-like structure, and the first sub-box 120 covers the open side of the second sub-box 130, so that the first sub-box 120 and the second sub-box 130 jointly define a storage space; the first sub-box 120 and the second sub-box 130 may also be hollow structures both with one side open, and the open side of the first sub-box 120 covers the open side of the second sub-box 130.

[0091] In the battery 100, there may be multiple battery cells 1, and the multiple battery cells 1 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 1 are both connected in series and in parallel. The multiple battery cells 1 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 1 is accommodated in the box 110; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 1 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 110. The battery 100 may also include other structures, for example, the battery 100 may also include a converging component for realizing electrical connection between the multiple battery cells 1.

[0092] The battery cell 1 may be a secondary battery or a primary battery; the battery cell 1 may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0093] Please refer to Figure 3 , Figure 3 An exploded view of a battery cell provided in some embodiments of the present application. Figure 3 As shown, the battery cell 1 includes a housing 70, an electrode assembly 60 and an electrode terminal 51. The housing 70 includes a shell 10 and an end cap 50. The shell 10 has an opening 14. The end cap 50 closes the opening 14 to isolate the internal environment of the battery cell 1 from the external environment.

[0094] The shell 10 is a component used to cooperate with the end cap 50 to form the internal environment of the battery cell 1, wherein the formed internal environment can be used to accommodate the electrode assembly 60, the electrolyte and other components. The shell 10 and the end cap 50 can be independent components. The shell 10 can be of various shapes and sizes. Specifically, the shape of the shell 10 can be determined according to the specific shape and size of the electrode assembly 60. The material of the shell 10 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. Among them, the shell 10 can be formed by the bottom wall 10 and the side wall.

[0095] The end cap 50 refers to a component that covers the opening 14 of the shell 10 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end cap 50 can be adapted to the shape of the shell 10 to match the shell 10. Optionally, the end cap 50 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 50 is not easily deformed when squeezed and collided, so that the battery cell 1 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals 51 can be provided on the end cap 50. The electrode terminal 51 can be used to electrically connect to the electrode assembly 60 for outputting or inputting electrical energy of the battery cell 1. The material of the end cap 50 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose special restrictions on this. In some embodiments, an insulating structure can also be provided on the inner side of the end cap 50, and the insulating structure can be used to isolate the electrical connection components in the shell 10 from the end cap 50 to reduce the risk of short circuit. Exemplarily, the insulating structure may be plastic, rubber, or the like.

[0096] The electrode assembly 60 is a component in the battery cell 1 where electrochemical reactions occur. One or more electrode assemblies 60 may be included in the housing 10. The electrode assembly 60 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 avoid short circuits between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a pole ear. The positive pole ear and the negative pole ear may be located together at one end of the main body or respectively at both ends of the main body.

[0097] Please refer to Figure 3 , and refer to Figures 4 to 7 , Figure 4 A schematic diagram of the structure of a housing provided in some embodiments of the present application; Figure 5 for Figure 4 Enlarged view of point C in the middle; Figure 6 is a schematic diagram of the structure of the first wall in some embodiments; Figure 7 Schematic diagram of the structure of the first wall in some other embodiments. Figure 6 and Figure 7The pressure relief mechanism is indicated by a dotted line. The embodiment of the present application provides a battery cell 1, which includes a shell 10, a pressure relief mechanism 20 and an insulating member 30. The shell 10 has a first wall 11. The pressure relief mechanism 20 is arranged on the first wall 11. At least a portion of the insulating member 30 is covered on the outer surface of the first wall 11, and the insulating member 30 includes a first sub-insulator 31 and a second sub-insulator 32. The first sub-insulator 31 covers the pressure relief mechanism 20, and at least a portion of the second sub-insulator 32 is spaced apart from the first sub-insulator 31 to form a gap 40 between the first sub-insulator 31 and the second sub-insulator 31.

[0098] In some embodiments, the pressure relief mechanism 20 may be a part of the first wall 11, or may be a separate structure from the first wall 11, and may be fixed to the first wall 11 by, for example, welding. When the pressure relief mechanism 20 is a part of the first wall 11, for example, the pressure relief mechanism 20 may be formed by providing a notch on the first wall 11, and the thickness of the first wall 11 corresponding to the notch is less than the thickness of the pressure relief mechanism 20 in other areas except the notch. The notch is the weakest position of the pressure relief mechanism 20. When too much gas is generated by the battery cell 1, causing the internal pressure of the shell 10 to rise and reach a threshold, or the internal reaction of the battery cell 1 generates heat, causing the internal temperature of the battery cell 1 to rise and reach a threshold, the pressure relief mechanism 20 may rupture at the notch, causing the shell 10 to communicate with the inside and outside, and the gas pressure and temperature are released outward through the rupture of the pressure relief mechanism 20, thereby preventing the battery cell 1 from exploding.

[0099] In some embodiments, the pressure relief mechanism 20 may be various possible pressure relief structures, which are not limited in the embodiments of the present application. For example, the pressure relief mechanism 20 may be a temperature-sensitive pressure relief mechanism 20, which is configured to melt when the internal temperature of the battery cell 1 provided with the pressure relief mechanism 20 reaches a threshold value; and / or, the pressure relief mechanism 20 may be a pressure-sensitive pressure relief mechanism 20, which is configured to rupture when the internal air pressure of the battery cell 1 provided with the pressure relief mechanism 20 reaches a threshold value.

[0100] In some embodiments, the insulating member 30 may be an insulating film, which can reduce the risk of damage to the battery cell 1 by the external environment, such as friction, collision, moisture, and oxygen. At the same time, the insulating film has good insulation performance, which can reduce the risk of short circuit between the positive and negative electrodes of the battery cell 1, thereby improving the reliability of the battery cell 1. In addition, the insulating film can also play an aesthetic role, improving the appearance quality of the entire battery cell 1.

[0101] In some embodiments, the insulating film can be wrapped around the outer surface of the housing 10 of the battery cell 1 by cutting, hot pressing, etc., to achieve protection, insulation and aesthetic effects. The insulating film can be made of polymer film, composite film, etc.

[0102] In some embodiments, a portion of the insulating film may cover the outer surface of the first wall 11 , and another portion may cover the outer surfaces of other walls of the housing 10 .

[0103] In some embodiments, the insulating film may be coated on the outer surface of the first wall 11 , and then the slit 40 may be formed by laser cutting, so as to divide the insulating film into a first sub-insulating film and a second sub-insulating film.

[0104] In some embodiments, the first sub-insulator 31 covers the pressure relief mechanism 20, a portion of the second sub-insulator 32 covers the outer surface of other parts of the first wall 11 except the pressure relief mechanism 20, and another portion of the second sub-insulator 32 may also cover the outer surface of other walls of the housing 10. The second sub-insulator 32 may completely cover the outer surface of other walls of the housing 10, or may cover part of the outer surface of other walls of the housing 10.

[0105] In some embodiments, the first sub-insulator 31 and the second sub-insulator 32 may be completely separated, that is, the gap 40 is arranged around the first sub-insulator 31. The first sub-insulator 31 and the second sub-insulator 32 may also be partially separated, that is, a part of the first sub-insulator 31 and a part of the second sub-insulator 32 are arranged to be separated, and the gap 40 is defined together, and another part of the first sub-insulator 31 and another part of the second sub-insulator 32 may be connected.

[0106] The technical solution of the embodiment of the present application improves the insulation performance of the battery cell 1 by covering the outer surface of the first wall 11 with the insulating member 30. At the same time, the pressure relief mechanism 20 is covered by the first sub-insulating member 31, and the first sub-insulating member 31 and the second sub-insulating member 32 are at least partially spaced apart, thereby reducing the risk of the first sub-insulating member 31 affecting the pressure relief of the pressure relief mechanism 20, thereby improving the reliability of the battery cell 1, and thus improving the reliability of the battery 100.

[0107] Please refer to Figures 3 to 7 In some embodiments, the first sub-insulator 31 and the second sub-insulator 32 are spaced apart from each other.

[0108] In some embodiments, the first sub-insulator 31 and the second sub-insulator 32 may be completely separated, that is, the gap 40 is arranged around the first sub-insulator 31 , and the adjacent edges of the first sub-insulator 31 and the second sub-insulator 32 jointly define the gap 40 .

[0109] The technical solution of the embodiment of the present application completely separates the first sub-insulator 31 from the second sub-insulator 32 , further reducing the risk of the first sub-insulator 31 affecting the pressure relief of the pressure relief mechanism 20 , thereby improving the reliability of the battery 100 .

[0110] Please refer to Figure 5 and Figure 6 In some embodiments, the gap 40 has a first width A, satisfying the condition: 0.2 mm ≤ A ≤ 5 mm.

[0111] In some embodiments, the gap 40 has a first width A, that is, when the first sub-insulator 31 is completely separated from the second sub-insulator 32, the minimum distance between the projection of the first sub-insulator 31 and the projection of the second sub-insulator 32 with the thickness direction X of the first wall 11 as the projection direction.

[0112] In some embodiments, the thickness direction X of the first wall 11 may be represented by the direction indicated by the letter X in the figure.

[0113] In some embodiments, when the first sub-insulator 31 is partially spaced from the second sub-insulator 32 , a gap 40 is formed at the portion where the first sub-insulator 31 is spaced from the second sub-insulator 32 , and the gap 40 also meets the above conditions.

[0114] In some embodiments, the first width A satisfies the above conditions, and the first width A can be 0.2 mm, 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc.

[0115] In some embodiments, the first width A of the gap 40 corresponds to the width of a portion of the first wall 11 that is not covered by the insulating member 30 .

[0116] In the technical solution of the embodiment of the present application, the first width A of the gap 40 meets the above conditions, which facilitates processing and enables the insulating member 30 to have better insulation performance.

[0117] Please refer to Figure 5 and Figure 6 , in some embodiments, 0.4mm≤A≤1mm.

[0118] In some embodiments, the first width A satisfies the above conditions, and the first width A may be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc.

[0119] In the technical solution of the embodiment of the present application, the first width A of the gap 40 meets the above conditions, which further reduces the difficulty of processing and enables the insulating member 30 to have better insulation performance.

[0120] Please refer to Figure 5 and Figure 6In some embodiments, with the thickness direction X of the first wall 11 as the projection direction, the projection of the first sub-insulator 31 covers the projection of the pressure relief mechanism 20, and there is a first spacing B between the edge of the projection of the first sub-insulator 31 and the edge of the projection of the pressure relief mechanism 20, satisfying the condition: 0.5mm≤B≤5mm.

[0121] In some embodiments, the pressure relief mechanism 20 may be a structure separated from the first wall 11, the first wall 11 may be provided with a groove for accommodating the installation of the pressure relief mechanism 20, the first sub-insulator 31 covers the pressure relief mechanism 20, that is, the first sub-insulator 31 covers the groove, and the first sub-insulator 31 and the pressure relief mechanism 20 may be spaced apart in the thickness direction X of the first wall 11. In order to facilitate the arrangement of the first sub-insulator 31, the first sub-insulator 31 is usually arranged on the wall surface of the first wall 11 outside the groove, and the first spacing B is the size of the first sub-insulator 31 covering the wall surface of the first wall 11 except the groove.

[0122] In some embodiments, the first spacing B satisfies the above conditions, and the first spacing B can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc.

[0123] According to the technical solution of the embodiment of the present application, a first spacing B between the edge of the projection of the first sub-insulator 31 and the edge of the projection of the pressure relief mechanism 20 satisfies the above conditions. On the one hand, it reduces the risk of affecting the pressure relief mechanism 20 when processing the gap 40. On the other hand, it also reduces the risk of the first sub-insulator 31 affecting the pressure relief of the pressure relief mechanism 20, thereby improving the reliability of the battery 100.

[0124] Please refer to Figure 5 and Figure 6 , in some embodiments, 1mm≤B≤2mm.

[0125] In some embodiments, the first spacing B satisfies the above conditions, and the first spacing B may be 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, etc.

[0126] In the technical solution of the embodiment of the present application, the first spacing B satisfies the above conditions, further reducing the risk of affecting the pressure relief mechanism 20 when processing the gap 40, and also reducing the risk of the first sub-insulating member 31 affecting the pressure relief of the pressure relief mechanism 20, thereby improving the reliability of the battery 100.

[0127] Please refer to Figure 3 and Figure 4In some embodiments, the battery cell 1 further includes an end cover 50, which is provided with a first electrode terminal 511 and a second electrode terminal 512, and the polarities of the first electrode terminal 511 and the second electrode terminal 512 are opposite; the shell 10 includes a bottom wall 12 and a plurality of side walls 13, and the plurality of side walls 13 are arranged around the bottom wall 12, one end of the plurality of side walls 13 is connected to the bottom wall 12, and the other end forms an opening 14, and the end cover 50 closes the opening 14.

[0128] In some embodiments, the number of the electrode terminals 51 may be two, one being a first electrode terminal 511 and the other being a second electrode terminal 512 , and the first electrode terminal 511 and the second electrode terminal 512 have opposite polarities.

[0129] In some embodiments, the first electrode terminal 511 may be a positive terminal, and the second electrode terminal 512 may be a negative terminal.

[0130] In some embodiments, the first electrode terminal 511 may be a negative electrode terminal, and the second electrode terminal 512 may be a positive electrode terminal.

[0131] In some embodiments, the first wall 11 may be a bottom wall 12. At this time, in the thickness direction X of the first wall 11, the bottom wall 12 and the end cover 50 are disposed opposite to each other.

[0132] In some embodiments, the first wall 11 may be a side wall 13 .

[0133] The technical solution of the embodiment of the present application realizes the electrical connection between the battery cell 1 and the outside world by providing the first electrode terminal 511 and the second electrode terminal 512 .

[0134] Please refer to Figure 4 and Figure 5 In some embodiments, the first wall 11 is a bottom wall 12 .

[0135] In the technical solution of the embodiment of the present application, the pressure relief mechanism 20 is arranged on the bottom wall 12 , which improves the ability of the battery cell 1 to withstand the impact force during pressure relief, thereby improving the reliability of the battery cell 1 .

[0136] Please refer to Figures 3 to 7 In some embodiments, the first sub-insulator 31 includes a main body 311 and an identification portion 312. The main body 311 covers the pressure relief mechanism 20. With the thickness direction of the bottom wall 12 as the projection direction, the projection of the identification portion 312 is located on the side of the projection of the main body 311 close to the projection of the first electrode terminal 511.

[0137] In some embodiments, the logo portion 312 may have characteristic differences from the main body 311. For example, the logo portion 312 may be protruding from the main body 311, or the logo portion 312 may be concave toward the main body 311, or the logo portion 312 may have a color difference from the main body 311, or the logo portion 312 may be located inside the main body 311, that is, the logo portion 312 is connected to the main body 311 on all sides and surrounded by the main body 311, or the logo portion 312 may have other shapes, etc.

[0138] In some embodiments, there may be a gap 40 between the identification portion 312 and the second sub-insulator 32, and the width of the gap 40 remains unchanged. That is, the portion of the second sub-insulator 32 corresponding to the identification portion 312 may correspond to the shape and size of the identification portion 312, so that the width of the gap 40 corresponding to the identification portion 312 remains unchanged with the width of the gap 40 corresponding to the main body 311.

[0139] In some embodiments, the first electrode terminal 511 may be a positive terminal, and the first electrode terminal 511 may also be a negative terminal.

[0140] The electrode terminal 51 is usually disposed on the end cover 50 . When the battery cell 1 is assembled in the box 110 , the bottom wall 12 of the battery cell 1 is usually facing outward and the end cover 50 is facing inward. Therefore, it is inconvenient to distinguish the polarity of the electrode terminal 51 during assembly.

[0141] In some embodiments, the first wall 11 may be a bottom wall 12 . When the battery cell 1 is assembled, the bottom wall 12 faces outward, that is, the identification portion 312 faces outward, and the polarity of the electrode terminal 51 can be distinguished by the direction of the identification portion 312 .

[0142] The technical solution of the embodiment of the present application, by setting the identification portion 312 to point to the first electrode terminal 511, facilitates distinguishing the positions of the first electrode terminal 511 and the second electrode terminal 512 when the battery cell 1 is assembled to form the battery 100, thereby improving the convenience and efficiency of assembly.

[0143] Please refer to Figures 3 to 7 In some embodiments, the projection of the identification portion 312 protrudes beyond the projection of the main body portion 311 in a direction facing the projection of the first electrode terminal 511 .

[0144] According to the technical solution of the embodiment of the present application, the projection of the identification portion 312 protrudes from the projection of the main body portion 311, which facilitates the distinction between the positions of the first electrode terminal 511 and the second electrode terminal 512, thereby improving the convenience and efficiency of assembly.

[0145] Please refer to Figure 8 and Fig. 9 , Figure 8 It is a schematic diagram of the structure of the pressure relief mechanism in some embodiments; Fig. 9 Schematic diagram of the structure of the pressure relief mechanism in some other embodiments. In some embodiments, the pressure relief mechanism 20 includes a weak portion 22 and a main body 21 , the weak portion 22 is connected to the main body 21 , and the maximum thickness of the weak portion 22 is less than the minimum thickness of the main body 21 .

[0146] In some embodiments, the maximum thickness of the weak portion 22 is less than the minimum thickness of the main body 21 , and the pressure relief mechanism 20 can be a separate structure from the first wall 11 . When pressure is released, the weak portion 22 of the pressure relief mechanism 20 opens along the edge of the weak portion 22 to achieve pressure relief.

[0147] In the technical solution of the embodiment of the present application, the maximum thickness of the weak portion 22 is less than the minimum thickness of the main body 21 , so that the pressure relief mechanism 20 can be opened from the weak portion 22 to better achieve pressure relief, thereby improving the reliability of the battery cell 1 .

[0148] Please refer to Figure 8 and Fig. 9 In some embodiments, the weak portion 22 is arranged along the circumference of the pressure relief mechanism 20, and the weak portion 22 has a first end 221 and a second end 222 that are relatively arranged along the circumference of the pressure relief mechanism 20. The weak portion 22 is configured to flip relative to the main body 21 around a first axis 223 when the pressure relief mechanism 20 releases pressure, and the first axis 223 is a line connecting the first end 221 and the second end 222.

[0149] Please refer to Figure 8 In some embodiments, the weak portion 22 is arranged along the circumference of the pressure relief mechanism 20, the edge of the main body 21 can be the edge of the pressure relief mechanism 20, and the weak portion 22 can be close to the edge of the main body 21 and match the edge contour of the main body 21.

[0150] Please refer to Fig. 9 In some embodiments, the weak portion 22 may be a portion of the edge of the pressure relief mechanism 20. Taking the thickness direction X of the first wall 11 as the projection direction, the edge of the projection of the pressure relief mechanism 20 may be annular, that is, the projection of the weak portion 22 is an open ring.

[0151] In some embodiments, the weak portion 22 may constitute the edge of the pressure relief mechanism 20. Taking the thickness direction X of the first wall 11 as the projection direction, the edge of the projection of the pressure relief mechanism 20 may be annular, that is, the projection of the weak portion 22 is a closed ring.

[0152] In some embodiments, the first axis 223 may be Figure 7 and Fig. 9 Indicated by dotted line.

[0153] In some embodiments, the weak portion 22 can be a part of the edge of the pressure relief mechanism 20, and the first end 221 and the second end 222 of the weak portion 22 are connected to form a first axis 223. When the pressure is released, the weak portion 22 flips around the first axis 223, and the pressure relief mechanism 20 opens along the direction of the weak portion 22.

[0154] According to the technical solution of the embodiment of the present application, when the pressure relief mechanism 20 releases pressure, the weak portion 22 flips around the first axis 223 to achieve pressure relief, thereby reducing the risk of the pressure relief mechanism 20 detaching from the shell 10 and damaging other components during pressure relief, thereby improving the reliability of the battery 100.

[0155] Please refer to Figure 7 and Fig. 9 , among which, in Figure 7 The pressure relief mechanism is represented by a dotted line, and the main body and the weak part of the pressure relief mechanism are distinguished by different dotted lines, and the first sub-insulator and the second sub-insulator are distinguished by dotted lines different from the pressure relief mechanism. In some embodiments, the first sub-insulator 31 further has a connecting portion 313, and the connecting portion 313 is connected to the second sub-insulator 32. The projection direction is the thickness direction X of the first wall 11. The projection of the connecting portion 313 is located between the first end 221 and the second end 222. The projection of the connecting portion 313 does not overlap with the projection of the weak part 22, and the projection of the connecting portion 313 covers the first axis 223.

[0156] In some embodiments, the weak portion 22 may be a portion of the edge of the pressure relief mechanism 20, that is, the projection of the weak portion 22 is an open ring. The connecting portion 313 is connected to the second sub-insulating member 32, and the connecting portion 313 does not cover the weak portion 22. When the pressure is released, the weak portion 22 is opened, and the portion of the first sub-insulating member 31 other than the connecting portion 313 is opened together with the weak portion 22. In the thickness direction X of the first wall 11, the connecting portion 313 is connected to the second sub-insulating member 32.

[0157] According to the technical solution of the embodiment of the present application, the connecting portion 313 is connected to the second sub-insulating member 32, which reduces the processing steps of spacing the first sub-insulating member 31 and the second sub-insulating member 32 and improves the processing efficiency. At the same time, the projection of the connecting portion 313 does not overlap with the projection of the weak portion 22, which reduces the risk of the first sub-insulating member 31 affecting the pressure relief mechanism 20, improves the reliability of the battery cell 1, and thus improves the reliability of the battery 100.

[0158] Please refer to Figure 2 The embodiment of the present application further provides a battery 100, comprising the battery cell 1 of any of the above embodiments.

[0159] Please refer to Figure 1The embodiment of the present application also provides an electrical device, including a battery cell 1 of any of the above embodiments or a battery 100 of any of the above embodiments, and the battery cell 1 or the battery 100 is used to provide electrical energy.

[0160] Please refer to Figures 3 to 7 In some embodiments, the battery cell 1 includes a housing 10, a pressure relief mechanism 20, and an insulating member 30. The housing 10 has a bottom wall 12, and the pressure relief mechanism 20 is disposed on the bottom wall 12. The insulating member 30 includes a first sub-insulating member 31 and a second sub-insulating member 32, wherein the first sub-insulating member 31 covers the pressure relief mechanism 20, and the second sub-insulating member 32 covers other areas of the bottom wall 12 except the pressure relief mechanism 20.

[0161] In some embodiments, the first sub-insulator 31 and the second sub-insulator 32 are spaced apart from each other, and a gap 40 is formed between the first sub-insulator 31 and the second sub-insulator 32 .

[0162] In some embodiments, when the pressure is released, the pressure relief mechanism 20 is actuated, and the first sub-insulator 31 is opened together with the pressure relief mechanism 20 .

[0163] According to the technical solution of the embodiment of the present application, the first sub-insulator 31 and the second sub-insulator 32 are spaced apart from each other, which reduces the risk of the first sub-insulator 31 affecting the pressure relief mechanism 20 , facilitates the pressure relief of the pressure relief mechanism 20 , and thus improves the reliability of the battery 100 .

[0164] 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 having a first wall; A pressure relief mechanism, disposed on the first wall; An insulating member is at least partially covered on the outer surface of the first wall, and the insulating member includes a first sub-insulator and a second sub-insulator, the first sub-insulator covers the pressure relief mechanism, and at least a portion of the second sub-insulator is spaced apart from the first sub-insulator to form a gap between the first sub-insulator and the second sub-insulator.

2. The battery cell according to claim 1, characterized in that: The first sub-insulating member and the second sub-insulating member are spaced apart from each other.

3. The battery cell according to claim 1, characterized in that: The gap has a first width A, which satisfies the condition: 0.2 mm≤A≤5 mm.

4. The battery cell according to claim 3, characterized in that: 0.4mm≤A≤1mm.

5. The battery cell according to claim 1, characterized in that: Taking the thickness direction of the first wall as the projection direction, the projection of the first sub-insulator covers the projection of the pressure relief mechanism, and there is a first spacing B between the edge of the projection of the first sub-insulator and the edge of the projection of the pressure relief mechanism, satisfying the condition: 0.5mm≤B≤5mm.

6. The battery cell according to claim 5, characterized in that: 1mm≤B≤2mm.

7. The battery cell according to claim 1, characterized in that: The battery cell further comprises an end cap, the end cap being provided with a first electrode terminal and a second electrode terminal, the first electrode terminal and the second electrode terminal having opposite polarities; The shell comprises a bottom wall and a plurality of side walls, wherein the plurality of side walls are arranged around the bottom wall, one end of the plurality of side walls is connected to the bottom wall, and the other end forms an opening, and the end cover closes the opening.

8. The battery cell according to claim 7, characterized in that: The first wall is a bottom wall.

9. The battery cell according to claim 8, characterized in that: The first sub-insulator includes a main body and an identification portion, the main body covers the pressure relief mechanism, and the projection direction is the thickness direction of the bottom wall. The projection of the identification portion is located on the side of the projection of the main body close to the projection of the first electrode terminal.

10. The battery cell according to claim 9, characterized in that: The projection of the identification portion protrudes beyond the projection of the main body portion in a direction facing the projection of the first electrode terminal.

11. The battery cell according to claim 1, characterized in that: The pressure relief mechanism comprises a weak portion and a main body portion, the weak portion is connected to the main body portion, and the maximum thickness of the weak portion is less than the minimum thickness of the main body portion.

12. The battery cell according to claim 11, characterized in that: The weak portion is arranged along the circumference of the pressure relief mechanism, and has a first end and a second end arranged opposite to each other along the circumference of the pressure relief mechanism. The weak portion is configured to flip relative to the main body around a first axis when the pressure relief mechanism releases pressure, and the first axis is a line connecting the first end and the second end.

13. The battery cell according to claim 12, characterized in that: The first sub-insulator also has a connecting portion, which is connected to the second sub-insulator. The projection direction is the thickness direction of the first wall. The projection of the connecting portion is located between the first end and the second end. The projection of the connecting portion does not overlap with the projection of the weak portion, and the projection of the connecting portion covers the first axis.

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

15. An electrical equipment, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 13, or the battery according to claim 14, wherein the battery cell or the battery is used to provide electrical energy.

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