Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. The single battery comprises a shell, an electrode terminal, an electrode assembly, a first insulating part and a second insulating part, the shell is provided with a first wall and a containing cavity, and the first wall is provided with an electrode leading-out hole communicated with the containing cavity. The electrode terminals are arranged in the electrode lead-out holes. The electrode assembly is contained in the containing cavity and comprises a first tab and a second tab which are opposite in polarity, the first tab is electrically connected to the electrode terminal, and the second tab is electrically connected to the first wall. At least part of the first insulating part is arranged between the electrode terminal and the first wall, the first insulating part is provided with a containing part, and the containing part penetrates through the first insulating part in the thickness direction of the first wall. At least part of the second insulating part is contained in the containing part, the two ends of the second insulating part abut against the first wall and the electrode terminal respectively in the thickness direction, and the thermal weight loss temperature of the second insulating part is larger than that of the first insulating part. According to the invention, the reliability of the battery monomer can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device and a power consumption device. BACKGROUND

[0002] With the development of new energy technology, batteries are applied more and more widely, such as in mobile phones, notebook computers, electric cars, electric vehicles, electric aircraft, electric ships, electric toy cars, electric toy ships, electric toy aircraft and electric tools.

[0003] In the development of battery technology, how to improve the reliability of the battery monomer is a research direction in the battery technology. Utility model content

[0004] In view of the above problems, the present application provides a battery monomer, a battery device and a power consumption device, which can effectively improve the reliability of the battery monomer.

[0005] In a first aspect, the embodiments of the present application provide a battery monomer, which comprises a shell, an electrode terminal, an electrode assembly, a first insulating piece and a second insulating piece. The shell has a first wall and a containing cavity, and the first wall is provided with an electrode lead-out hole communicating with the containing cavity. The electrode terminal is arranged in the electrode lead-out hole. The electrode assembly is contained in the containing cavity, and the electrode assembly comprises first and second polar ears with opposite polarities. The first polar ear is electrically connected to the electrode terminal, and the second polar ear is electrically connected to the first wall. At least part of the first insulating piece is arranged between the electrode terminal and the first wall, and the first insulating piece is provided with a containing portion penetrating through the first insulating piece along the thickness direction of the first wall. At least part of the second insulating piece is contained in the containing portion. In the thickness direction, the two ends of the second insulating piece abut against the first wall and the electrode terminal respectively, and the thermal weight loss temperature of the second insulating piece is greater than the thermal weight loss temperature of the first insulating piece.

[0006] The above technical solution sets the second insulating piece with a higher thermal weight loss temperature between the first wall and the electrode terminal, so that when the battery monomer is in thermal runaway, the second insulating piece can have a stable structural form. Even if the first insulating piece melts or melts, the second insulating piece can also insulate and separate the electrode terminal and the first wall, and can support the electrode terminal, thereby reducing the risk of the electrode terminal being overlapped and conducted with the shell, reducing the short circuit risk of the battery monomer, and improving the reliability of the battery monomer.

[0007] In some embodiments of the first aspect, in the thickness direction, the side of the first wall facing the containing portion is provided with a first recess, and a part of the second insulating piece is contained in the first recess.

[0008] The first recess can fix the second insulating piece to some extent, can limit displacement of the second insulating piece in a direction parallel to the plane in which the first wall is located, and thus can improve stability of the second insulating piece. When the battery monomer is in thermal runaway and the first insulating piece melts or melts, the second insulating piece is less likely to shake or move, and can more effectively support the electrode terminal to further reduce the risk of electrode terminal and shell lap conduction.

[0009] In some embodiments of the first aspect, the first wall further has a first protrusion corresponding to the first recess, the first protrusion protruding from a side surface of the first wall away from the second insulating piece.

[0010] The above technical solution, on the one hand, through the cooperation of the first recess and the first protrusion, can not only simplify the preparation process of the first recess, but also further improve the structural strength of the first wall itself.

[0011] In some embodiments of the first aspect, the number of accommodating portions is a plurality, and the plurality of accommodating portions are arranged at intervals along the circumference of the electrode terminal. The second insulating piece is a plurality, and the plurality of second insulating pieces are arranged one-to-one corresponding to the plurality of accommodating portions.

[0012] The above technical solution can improve the uniformity of the support force exerted by the second insulating piece on the electrode terminal, to improve the support effect of the second insulating piece on the electrode terminal, and thus further improve the stability of the electrode terminal when the battery monomer is in thermal runaway and the first insulating piece melts or melts.

[0013] In some embodiments of the first aspect, the plurality of accommodating portions are equidistantly distributed along the circumference. The uniformity of the support force exerted by the second insulating piece on the electrode terminal can be further improved.

[0014] In some embodiments of the first aspect, the size of the accommodating portion along the circumference of the electrode terminal is greater than the size of the accommodating portion along the thickness direction.

[0015] The above technical solution can provide more space for the arrangement of the second insulating piece, improve the design flexibility of the second insulating piece, and adapt to different application requirements.

[0016] In some embodiments of the first aspect, the second insulating piece is bonded to the first insulating piece.

[0017] Bonding the second insulating piece to the first insulating piece can improve the stability of the second insulating piece, reduce the displacement of the second insulating piece when the battery monomer is subjected to external impact, and reduce the risk of insulation failure. The bonding process is easy to implement, and the bonding interface has good sealing performance.

[0018] In some embodiments of the first aspect, the electrode terminal comprises a terminal body and a first limiting portion, at least a portion of the terminal body is accommodated in the electrode lead-out hole, and the first limiting portion is connected to the terminal body, at least a portion of the first limiting portion protrudes from the outer circumferential surface of the terminal body. In the thickness direction, the first limiting portion is located outside the first wall, and the two ends of the second insulating piece abut against the first wall and the first limiting portion, respectively.

[0019] The first wall and the first limiting portion can limit each other in the thickness direction, thereby improving the stability of the electrode terminal. In addition, when the battery monomer is in thermal runaway, the second insulating piece can be kept between the first limiting portion and the first wall, thereby reducing the risk of direct contact between the first limiting portion and the first wall, inhibiting the current between the electrode terminal and the first wall, reducing the risk of the electrode terminal being in contact with the shell, thereby reducing the risk of short circuit of the battery monomer and improving the reliability of the battery monomer.

[0020] In some embodiments of the first aspect, in the thickness direction, a side of the first limiting portion facing the accommodating portion is provided with a second recess, and a portion of the second insulating piece is accommodated in the second recess.

[0021] The second recess can fix the second insulating piece to a certain extent, limit the displacement of the second insulating piece in the direction parallel to the plane in which the first wall is located, and thereby improve the stability of the second insulating piece. This makes the second insulating piece less likely to shake or move when the battery monomer is in thermal runaway and the first insulating piece is melted or fused, and the electrode terminal can be more effectively supported to further reduce the risk of the electrode terminal being in contact with the shell.

[0022] In some embodiments of the first aspect, in the thickness direction, a side of the first wall facing the accommodating portion is provided with a first recess, and a portion of the second insulating piece is accommodated in the first recess. The projection of the second recess in the thickness direction at least partially overlaps the projection of the first recess in the thickness direction.

[0023] One end of the second insulating piece in the thickness direction is inserted into the first recess, and the other end is inserted into the second recess, which can further improve the stability of the second insulating piece. In addition, the projection of the second recess in the thickness direction at least partially overlaps the projection of the first recess in the thickness direction, which can reduce the component of the support force exerted by the second insulating piece on the electrode terminal and the first wall in the direction intersecting the thickness direction, thereby improving the support effect of the second insulating piece on the electrode terminal. In addition, the extension length of the second insulating piece can be reduced, which helps to reduce the difficulty of setting the second insulating piece.

[0024] In some embodiments of the first aspect, the projection of the accommodating portion in the thickness direction is circular. This helps to simplify the manufacturing process and reduce costs.

[0025] In some embodiments of the first aspect, the first dimension r1 of the accommodation portion in the radial direction and the second dimension r2 of the second insulating member in the radial direction satisfy the relationship: 0.05mm≤r2≤r1, 0.1mm≤r1≤4mm; optionally, 0.1mm≤r2≤r1, 0.2mm≤r1≤2mm.

[0026] The above technical solution can improve the insulation effect of the second insulating member while reducing the impact on the energy density of the battery monomer to a certain extent by setting the first dimension r1 and the second dimension r2 within the above range.

[0027] In some embodiments of the first aspect, the third dimension h1 of the accommodation portion in the thickness direction and the fourth dimension h2 of the second insulating member in the thickness direction satisfy the relationship: 0.02mm≤h1≤h2, 0.05mm≤h2≤4mm; optionally, 0.05mm≤h1≤h2, 0.1mm≤h2≤2mm.

[0028] The above technical solution can improve the insulation effect of the second insulating member while reducing the impact on the energy density of the battery monomer to a certain extent by setting the third dimension h1 and the fourth dimension h2 within the above range.

[0029] In some embodiments of the first aspect, the thermal weight loss temperature of the second insulating member is greater than or equal to 300℃, and optionally, the thermal weight loss temperature of the second insulating member is greater than or equal to 350℃.

[0030] The weight loss rate of the second insulating member when the battery monomer is in thermal runaway can be further reduced to further reduce the risk of failure of the second insulating member.

[0031] In some embodiments of the first aspect, the second insulating member is ceramic. Ceramic material is easy to obtain, low in cost, and high in reliability.

[0032] In the second aspect, the present application provides a battery device comprising the battery monomer provided in any of the embodiments of the first aspect.

[0033] In some embodiments of the second aspect, the at least two battery monomers are connected in parallel.

[0034] In the third aspect, the present application provides a power consuming device comprising the battery monomer provided in any of the embodiments of the first aspect or the battery device provided in any of the embodiments of the second aspect, and the battery monomer or the battery device is used for storing or providing electric energy.

[0035] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the following specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0036] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not intended to be limiting of the application. Moreover, in the drawings, like reference numerals denote similar parts throughout the several views. In the drawings:

[0037] Figure 1 A structural schematic view of a vehicle provided by some embodiments of the present application;

[0038] Figure 2 An exploded structural schematic view of a battery device provided by some embodiments of the present application;

[0039] Figure 3 A structural schematic view of a battery module provided by some embodiments of the present application;

[0040] Figure 4 A structural schematic view of a battery cell provided by some embodiments of the present application;

[0041] Figure 5 An exploded structural schematic view of a battery cell provided by some embodiments of the present application;

[0042] Figure 6 A structural schematic view of Figure 4 along A-A;

[0043] Figure 7 A structural schematic view of Figure 6 at H;

[0044] Figure 8 A structural schematic view of a first insulating member of a battery cell provided by some embodiments of the present application;

[0045] Figure 9 A structural schematic view of Figure 8 along B-B;

[0046] Figure 10 A partial sectional schematic view of another battery cell provided by some embodiments of the present application;

[0047] Figure 11 A partial sectional schematic view of yet another battery cell provided by some embodiments of the present application;

[0048] Figure 12 A partial enlarged exploded structural schematic view of a first insulating member and a second insulating member of Figure 7 at K.

[0049] Reference Designators in the Detailed Description of the Invention:

[0050] 1 vehicle; 2 battery device; 3 controller; 4 motor; 5 case; 5a first case portion; 5b second case portion; 5c accommodation space; 6 battery module; 7 battery cell;

[0051] 10 housing; 11 first wall; 111 electrode lead-out hole; 112 first recess; 113 first protrusion; 12 accommodation cavity;

[0052] 20 electrode terminal; 21 terminal body; 22 first stopper; 221 second recess; 23 second stopper;

[0053] 30 electrode assembly; 31 first tab; 32 second tab;

[0054] 40 first insulating member; 41 accommodation portion; 50 second insulating member; Z thickness direction. DETAILED DESCRIPTION

[0055] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0056] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0057] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it independent or alternative to other embodiments.

[0058] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mounting", "connected", "connection", "attached" should be broadly understood, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] The term "and / or" in the present application only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0060] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0061] "Multiple" appearing in the present application means more than two (including two).

[0062] The term "parallel" in the present application not only includes the case of absolute parallel, but also includes the case of approximately parallel which is generally recognized in engineering; at the same time, "vertical" also not only includes the case of absolute vertical, but also includes the case of approximately vertical which is generally recognized in engineering.

[0063] At present, from the development of market situation, the application of battery is more and more extensive. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0064] The battery device generally refers to a single physical module including a plurality of battery monomers to provide higher voltage and capacity. The battery monomer can be the smallest unit constituting the battery device.

[0065] The battery monomer generally includes a housing, an electrode assembly accommodated in the housing, and a positive electrode lead-out portion and a negative electrode lead-out portion provided on the housing; the electrode assembly generally includes a positive electrode sheet and a negative electrode sheet, the positive electrode lead-out portion is electrically connected to the positive electrode sheet, and the negative electrode lead-out portion is electrically connected to the negative electrode sheet. The positive electrode lead-out portion and the negative electrode lead-out portion are used to be electrically connected with an external circuit to realize charging or discharging of the battery monomer.

[0066] In some embodiments, the battery cell includes an electrode terminal; one of the positive electrode lead-out portion and the negative electrode lead-out portion includes the electrode terminal, and the other includes a shell wall of the shell.

[0067] When a certain battery cell in the battery device experiences thermal runaway due to an accident (e.g., internal short circuit), the battery cell can maintain a high temperature state for a period of time. In the high temperature state, the insulating member for insulating and isolating the electrode terminal and the shell can fail, causing current from other battery cells or current from an external power source to continue to be transmitted between the electrode terminal and the shell, resulting in the battery cell continuously generating heat locally, thereby causing the risk of abnormal temperature rise and thermal runaway of other normal battery cells, leading to thermal propagation.

[0068] Exemplarily, when the conductive path between the electrode terminal of the battery cell and the shell is formed, a closed loop is formed between the battery cell and the battery cell connected in parallel with the battery cell, and current continuously flows through the battery cell, causing the battery cell to continuously generate heat locally.

[0069] In view of this, the embodiments of the present application provide a battery cell, which includes a shell, an electrode terminal, an electrode assembly, a first insulating member, and a second insulating member. The shell has a first wall and a receiving cavity, and the first wall is provided with an electrode lead-out hole in communication with the receiving cavity. The electrode terminal is arranged at the electrode lead-out hole. The electrode assembly is received in the receiving cavity, and the electrode assembly includes first and second tabs with opposite polarities, the first tab being electrically connected to the electrode terminal, and the second tab being electrically connected to the first wall. At least part of the first insulating member is arranged between the electrode terminal and the first wall, and the first insulating member is provided with a receiving portion penetrating the first insulating member in a thickness direction of the first wall. At least part of the second insulating member is received in the receiving portion, and in the thickness direction, two ends of the second insulating member abut against the first wall and the electrode terminal, respectively. The thermal weight loss temperature of the second insulating member is greater than the thermal weight loss temperature of the first insulating member.

[0070] By arranging the second insulating member with a higher thermal weight loss temperature between the first wall and the electrode terminal, when the battery cell experiences thermal runaway, the second insulating member can have a stable structural form, and even if the first insulating member melts or melts, the second insulating member can insulate and isolate the electrode terminal and the first wall, reducing the risk of the electrode terminal being lapped and conducted with the shell, thereby reducing the risk of short circuit of the battery cell and improving the reliability of the battery cell. In addition, the two ends of the second insulating member abut against the first wall and the electrode terminal, respectively, which can also to some extent avoid the electrode terminal from shaking when the first insulating member melts or melts, thereby further reducing the risk of the electrode terminal being lapped and conducted with the shell.

[0071] The battery cells described in this application are applicable to battery devices and electrical equipment using battery devices. Electrical equipment can be devices that use battery devices as a power source or various energy storage systems that use battery devices as energy storage elements. Electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0072] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0073] Figure 1 The diagram shows the structure of a vehicle provided in some embodiments of this application.

[0074] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0075] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0076] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0077] Figure 2 This is an exploded structural diagram of a battery device provided in some embodiments of this application.

[0078] In some embodiments, the battery device 2 may include one or more battery cell assemblies for providing voltage and capacity.

[0079] A battery cell assembly may include multiple battery cells ( Figure 2 (Not shown), multiple battery cells are connected in series, parallel, or mixed connection through a busbar. Mixed connection refers to multiple battery cells being connected in both series and parallel.

[0080] A battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0081] As an example, the battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium-metal battery cell, a sodium-metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-hydrogen battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc.

[0082] As an example, the battery cell can be a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, including a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc.

[0083] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module 6, which is formed by arranging and fixing a plurality of battery cells into one independent module. As an example, the battery module 6 can be formed by bundling a plurality of battery cells with a cable tie.

[0084] In some embodiments, the battery device 2 can be a battery pack, which includes a case 5 and one or more battery cell assemblies housed in the case 5. As an example, the battery cell assembly can be a battery module 6, which can be housed in the case by fixing the battery module 6 in the case. As an example, the battery cell assembly can also be housed in the case by fixing a plurality of battery cells directly in the case.

[0085] In some embodiments, the case 5 for housing the battery cells can be of various structures.

[0086] In some embodiments, the case 5 can include a first case 5a and a second case 5b. The first case 5a and the second case 5b are coupled so that an enclosed space is formed inside the case 5 to receive the battery cell assembly. The enclosed here means covered or closed, which can be sealed or unsealed. The first case can be a top cover or a bottom plate.

[0087] In some embodiments, the case 5 can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that an enclosed space is formed inside the case to receive the battery cell assembly. As an example, the frame can include a plurality of side beams.

[0088] In some embodiments, the case 5 can be part of the chassis structure of a vehicle. For example, part of the case 5 can be at least part of the floor of the vehicle, or part of the case 5 can be at least part of the cross beams and longitudinal beams of the vehicle.

[0089] In some embodiments, the battery device 2 can be an energy storage device.

[0090] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, energy storage devices can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours.

[0091] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0092] Figure 3 This is a schematic diagram of the structure of a battery module provided in some embodiments of this application.

[0093] In some embodiments, such as Figure 3 As shown, there are multiple battery cells 7, which are first connected in series, parallel, or a combination of both to form a battery module 6. These battery modules 6 are then connected in series, parallel, or a combination of both to form a whole, which is housed within the casing.

[0094] Multiple battery cells 7 in battery module 6 can be electrically connected through a busbar to achieve parallel, series, or mixed connection of multiple battery cells 7 in battery module 6. There can be one or more busbars, each used to electrically connect at least two battery cells 7.

[0095] Figure 4 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application. Figure 5 This is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of this application.

[0096] Continue to refer to Figure 4 to Figure 5 This application provides a battery cell 7, which includes a housing 10 and an electrode assembly 30 housed within the housing 10.

[0097] In some embodiments, the outer casing 10 may be a steel casing, an aluminum casing, or a composite metal casing (such as a copper-aluminum composite casing 10), etc.

[0098] The outer shell 10 may be a hollow structure, with an internal cavity 12 for accommodating the electrode assembly 30 and the electrolyte.

[0099] In some embodiments, the casing 10 of the battery cell 7 is a cylindrical casing 10, a square casing 10, a prismatic casing 10, or a casing 10 of other shapes.

[0100] In some embodiments, the housing 10 includes a housing and an end cap, the housing having an opening and the end cap being connected to the housing and covering the opening;

[0101] The shell is a component that cooperates with the end cap to form an internal cavity of the battery cell 7, which can be used to house the electrode assembly 30, electrolyte, and other components.

[0102] The shell and the end cap can be separate components. In an example, an opening can be provided on the shell, and the end cap can be used to cover the opening to form the internal cavity of the battery cell 7.

[0103] The shell can be in various shapes and sizes, such as a cuboid or a cylinder. In particular, the shape of the shell can be determined according to the specific shape and size of the electrode assembly 30. The shell can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0104] The shape of the end cap can be adapted to the shape of the shell to cooperate with the shell. The material of the end cap can be the same as or different from the material of the shell. Alternatively, the end cap can be made of a material with certain hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.), so that the end cap is less likely to deform when subjected to extrusion and impact, and the battery cell 7 can have higher structural strength and improved reliability.

[0105] The end cap can be connected to the shell by welding, bonding, clamping, or other means.

[0106] The shell can be open at one end or both ends. In some examples, the shell can be open at one side, and the end cap can be provided as one and cover the shell. In other examples, the shell can be open at both ends, and the end cap can be provided as two, each covering one of the openings of the shell.

[0107] The electrode assembly 30 is a component in which electrochemical reactions occur in the battery cell 7. One or more electrode assemblies 30 can be contained in the shell.

[0108] In some embodiments, the electrode assembly 30 includes a positive electrode sheet, a negative electrode sheet, and a separator, the positive electrode sheet and the negative electrode sheet being opposite in polarity, and the separator separating the positive electrode sheet and the negative electrode sheet.

[0109] At least part of the separator is located between the positive electrode sheet and the negative electrode sheet. During charging and discharging of the battery cell 7, active ions (such as lithium ions) are inserted and extracted between the positive electrode sheet and the negative electrode sheet. The separator, which is disposed between the positive electrode sheet and the negative electrode sheet, can prevent short circuiting of the positive and negative electrodes while allowing the active ions to pass through.

[0110] In some embodiments, the positive electrode sheet can include a positive electrode current collector and a positive electrode film layer disposed on at least one surface of the positive electrode current collector.

[0111] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode film layer is provided on either one or both of the two surfaces of the positive electrode current collector.

[0112] As an example, the positive electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, a nickel alloy, titanium, or silver, and the like can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, an aluminum alloy, nickel, a nickel alloy, titanium, a titanium alloy, silver, a silver alloy, and the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, and the like).

[0113] As an example, the positive electrode film layer includes a positive electrode active material, and the positive electrode active material can include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and respective modified compounds thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used. These positive electrode active materials can be used alone only in one kind, or two or more kinds can be used in combination. Among them, examples of the lithium-containing phosphates can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (which can also be referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxides can include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (which can also be referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1O2 (may also be referred to as NCM 811 LiNi 0.8 Co 0.15 Al 0.05 O2) and modified compounds thereof. The modified compounds refer to substances obtained by modification means such as doping or coating on the basis of the above-mentioned substances.

[0114] In some embodiments, the negative electrode sheet can include a negative electrode current collector.

[0115] As an example, the negative electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, a nickel alloy, titanium, or silver, etc. can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, a copper alloy, nickel, a nickel alloy, titanium, a titanium alloy, silver, and a silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0116] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector.

[0117] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode film layer is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0118] As an example, the negative electrode film layer includes a negative electrode active material, which can employ a negative electrode active material for a battery cell 7 known in the art. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative electrode active material for a battery cell 7 can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0119] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0120] In some embodiments, the separator includes a separator film. The separator film of the present application can employ any known porous structure film having good chemical stability and mechanical stability.

[0121] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different.

[0122] An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can be applied to the surface of the separator film.

[0123] The separator can be a separate component located between the positive electrode sheet and the negative electrode sheet, or can be attached to the surface of the positive electrode sheet or the surface of the negative electrode sheet.

[0124] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode sheet and the negative electrode sheet, and functions to transport ions and separate the positive and negative electrodes.

[0125] In some embodiments, the battery cell 7 further includes an electrolyte that functions to conduct ions between the positive electrode sheet and the negative electrode sheet. The electrolyte of the present application can be selected as needed. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0126] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0127] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro oxalate borate, lithium di-oxalate borate, lithium difluoro di-oxalate phosphate, and lithium tetrafluoro oxalate phosphate.

[0128] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butyl sulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether-based solvent. The ether-based solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0129] In some embodiments, the electrolyte solution can further optionally include an additive. For example, the additive can include a negative electrode film-forming additive, a positive electrode film-forming additive, and an additive capable of improving certain performance of the battery cell 7, such as an additive capable of improving overcharge / fast charge performance of the battery cell 7, an additive capable of improving high-temperature performance of the battery cell 7, an additive capable of improving low-temperature performance of the battery cell 7, and the like.

[0130] In some embodiments, the gel-state electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

[0131] In some embodiments, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0132] As an example, the polymer of the polymer solid-state electrolyte can include a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid, cellulose, or the like.

[0133] As an example, the inorganic solid-state electrolyte can be one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfide, argyrodite), amorphous sulfide), and a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0134] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0135] In some embodiments, the electrode assembly 30 can be a wound structure, a stacked structure, or a hybrid structure of a wound structure and a stacked structure.

[0136] In some embodiments, the electrode assembly 30 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0137] In some embodiments, the electrode assembly 30 is a stacked structure.

[0138] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be alternately stacked. As an example, a plurality of positive electrode sheets can be provided, and a negative electrode sheet can be folded to form a plurality of folded segments that are stacked. One positive electrode sheet can be interposed between adjacent folded segments.

[0139] As an example, the positive electrode sheet and the negative electrode sheet can each be folded to form a plurality of folded segments that are stacked.

[0140] As an example, a plurality of separators can be provided, and each of the plurality of separators can be interposed between any adjacent positive electrode sheet or negative electrode sheet.

[0141] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0142] In some embodiments, the electrode assembly 30 may be cylindrical, flat, or polygonal in shape.

[0143] In some embodiments, the positive current collector may include a positive tab, and the negative current collector may include a negative tab. The positive and negative tabs can be used to transmit current. As an example, at least a portion of the positive tab is not coated with a positive film layer, and at least a portion of the negative tab is not coated with a negative film layer.

[0144] In some embodiments, the electrode assembly 30 has a wound structure. The positive electrode tab is wound multiple turns along the winding direction. Optionally, the end of the positive electrode tab is bent by a flattening or smoothing process to form a multi-layer structure stacked in the axial direction of the electrode assembly 30. Optionally, the positive electrode tab is annular.

[0145] In some embodiments, the negative electrode tab is wound multiple turns along the winding direction. Optionally, the end of the negative electrode tab is bent by a flattening or smoothing process to form a multi-layer structure stacked in the axial direction of the electrode assembly 30. The negative electrode tab is annular.

[0146] In some embodiments, the electrode assembly 30 includes an electrode body. As an example, the electrode body includes a positive electrode film layer, a portion of the positive electrode current collector covered by the positive electrode film layer, a negative electrode film layer, a portion of the negative electrode current collector covered by the negative electrode film layer, and a separator.

[0147] The positive and negative tabs can be led out from the same end of the electrode body, or they can be led out from opposite ends of the electrode body. At least a portion of the positive tab protrudes to the outside of the insulating member, and at least a portion of the negative tab protrudes to the outside of the insulating member.

[0148] Figure 6 for Figure 4 A schematic diagram of the cross-sectional structure along AA. Figure 7 for Figure 6 A magnified schematic diagram of the local structure at point H. Figure 8 This is a schematic diagram of the structure of the first insulating member 40 of a battery cell 7 provided in some embodiments of this application. Figure 9 for Figure 8 A schematic diagram of the cross-sectional structure along BB.

[0149] Continue to refer to Figure 6 to Figure 9The battery cell 7 includes a housing 10, an electrode terminal 20, an electrode assembly 30, a first insulating member 40, and a second insulating member 50. The housing 10 has a first wall 11 and a receiving cavity 12. The first wall 11 is provided with an electrode lead-out hole 111 communicating with the receiving cavity 12. The electrode terminal 20 is arranged at the electrode lead-out hole 111. The electrode assembly 30 is received in the receiving cavity 12. The electrode assembly 30 includes first and second polar tabs 31 and 32 having opposite polarities. The first polar tab 31 is electrically connected to the electrode terminal 20, and the second polar tab 32 is electrically connected to the first wall 11. At least part of the first insulating member 40 is arranged between the electrode terminal 20 and the first wall 11. The first insulating member 40 is provided with a receiving portion 41 extending through the first insulating member 40 along a thickness direction Z of the first wall 11. At least part of the second insulating member 50 is received in the receiving portion 41. Along the thickness direction Z, two ends of the second insulating member 50 abut against the first wall 11 and the electrode terminal 20, respectively. The second insulating member 50 has a thermal weight loss temperature greater than that of the first insulating member 40.

[0150] The first wall 11 can be an end cover or a wall of a housing.

[0151] One of the first and second polar tabs 31 and 32 is a positive polar tab, and the other is a negative polar tab. The polarity of the electrode terminal 20 corresponds to that of the first polar tab 31. In some examples, the first polar tab 31 is a positive polar tab, and the electrode terminal 20 is a positive electrode terminal. In other examples, the first polar tab 31 is a negative polar tab, and the electrode terminal 20 is a negative electrode terminal.

[0152] The first and second polar tabs 31 and 32 can be arranged at the same end of the electrode assembly 30 or at opposite ends of the electrode assembly 30.

[0153] The first polar tab 31 can be directly connected to the electrode terminal 20 or indirectly connected to the electrode terminal 20 through other conductive structures.

[0154] The second polar tab 32 can be directly connected to the first wall 11 or indirectly connected to the first wall 11 through other conductive structures.

[0155] The electrode lead-out hole 111 extends through the first wall 11. For example, along the thickness direction Z of the first wall 11, the electrode lead-out hole 111 extends through the first wall 11, and a projection of the electrode terminal 20 at least partially overlaps a projection of the electrode lead-out hole 111.

[0156] The electrode lead-out hole 111 can be a circular hole, a square hole, a racetrack-shaped hole, an oval hole, or a hole having another shape.

[0157] In some examples, at least part of the electrode terminal 20 is located outside the first wall 11 and covers the electrode lead-out hole 111. Optionally, the electrode terminal 20 can be located entirely outside the first wall 11; alternatively, the electrode terminal 20 is provided through the electrode lead-out hole 111, part of the electrode terminal 20 is located outside the first wall 11, and part of the electrode terminal 20 is located inside the first wall 11.

[0158] The electrode terminal 20 and the first wall 11 are insulated from each other.

[0159] The first insulating member 40 can be provided entirely between the electrode terminal 20 and the first wall 11, or only partially between the electrode terminal 20 and the first wall 11.

[0160] The accommodation portion 41 is used to accommodate the second insulating member 50 and to avoid the second insulating member 50, so that the second insulating member 50 can pass through the accommodation portion 41 and abut against the first wall 11 and the electrode terminal 20 at both ends thereof, respectively.

[0161] The second insulating member 50 can be accommodated entirely in the accommodation portion 41, or only partially in the accommodation portion 41.

[0162] Exemplarily, the thermal weight loss temperature of the first insulating member 40 can be a 5% thermal weight loss temperature, and the thermal weight loss temperature of the second insulating member 50 can be a 5% thermal weight loss temperature. The 5% thermal weight loss temperature can be the temperature at which the mass of the test sample is lost by 5% relative to the initial mass in thermal gravimetric analysis. The thermal weight loss temperatures of the first insulating member 40 and the second insulating member 50 can be measured according to GB / T 27761-2011 Thermal Gravimetric Analyzer Test Method for Weight Loss and Residual Quantity.

[0163] When the battery cell 7 is in thermal runaway due to internal short circuit or other reasons, the battery cell 7 can maintain a high temperature state for a period of time. The thermal weight loss temperature of the second insulating member 50 is greater than that of the first insulating member 40, and the second insulating member 50 with a higher thermal weight loss temperature is less likely to lose weight or loses less weight when the battery cell 7 is in thermal runaway, so that the second insulating member 50 can be kept between the first wall 11 and the electrode terminal 20. Even if the first insulating member 40 melts or melts, the second insulating member 50 can insulate and separate the electrode terminal 20 and the first wall 11, reducing the risk of the electrode terminal 20 and the shell 10 being overlapped and conducting, thereby reducing the risk of short circuit of the battery cell 7 and improving the reliability of the battery cell 7.

[0164] In addition, the two ends of the second insulation member 50 are respectively abutted against the first wall 11 and the electrode terminal 20, and when the battery monomer 7 is in thermal runaway and the first insulation member 40 is melted or fused, the second insulation member 50 can support the electrode terminal 20, to a certain extent, avoid the electrode terminal 20 from shaking or moving, thereby reducing the risk of the electrode terminal 20 being in contact with the shell 10 due to shaking or moving, and further improving the reliability of the battery monomer 7.

[0165] For example, when the first wall 11 and the electrode terminal 20 of the normal battery monomer 7 are respectively electrically connected to the first wall 11 and the electrode terminal 20 of the battery monomer 7 in thermal runaway, the second insulation member 50 can cut off the circuit between the two battery monomers 7, reduce the continuous heat generation of the electrode terminal 20 and the first wall 11 of the battery monomer 7 in thermal runaway, reduce the thermal influence on the surrounding other battery monomers 7, reduce the risk of the other battery monomers 7 in thermal runaway, and improve the reliability.

[0166] The first wall 11 and the electrode terminal can serve as two electrodes of the battery monomer 7 and are located on the same side of the battery monomer 7. When a plurality of battery monomers 7 are assembled into a group, the connection of the busbar member with the first wall 11 or the connection of the busbar member with the electrode terminal 20 can be facilitated, and the structure of the battery device is simplified. Although the first wall 11 and the electrode terminal 20 are opposite in polarity, the second insulation member 50 can also inhibit the current between the first wall 11 and the electrode terminal 20 when the battery monomer 7 is in thermal runaway, reduce the continuous heat generation of the electrode terminal 20 and the first wall 11, and improve the reliability.

[0167] The above technical solution sets the second insulation member 50 with a higher thermal weight loss temperature between the first wall 11 and the electrode terminal 20, so that when the battery monomer 7 is in thermal runaway, the second insulation member 50 can have a stable structure form, even if the first insulation member 40 is melted or fused, the second insulation member 50 can insulate and separate the electrode terminal 20 and the first wall 11, and can support the electrode terminal 20, thereby reducing the risk of the electrode terminal 20 being in contact with the shell 10, thereby reducing the short circuit risk of the battery monomer 7 and improving the reliability of the battery monomer 7.

[0168] Figure 10 Another partial cross-sectional view of a battery monomer 7 provided by some embodiments of the present application.

[0169] Continuing to refer to Figure 10 In some embodiments, in the thickness direction Z, the side of the first wall 11 facing the accommodating portion 41 is provided with a first recess 112, and a part of the second insulation member 50 is accommodated in the first recess 112.

[0170] For example, the profile shape of the first recess 112 matches the profile shape of the second insulation member 50, and the second insulation member 50 is inserted into the first recess 112.

[0171] The first recess 112 can play a certain fixing role on the second insulating piece 50, can limit the displacement of the second insulating piece 50 in the direction parallel to the plane where the first wall 11 is located, thereby improving the stability of the second insulating piece 50. When the battery monomer 7 is in thermal runaway and the first insulating piece 40 is melted or molten, the second insulating piece 50 is more difficult to shake or move, and can more effectively support the electrode terminal 20 to further reduce the risk of electrode terminal 20 and shell 10 lapping conduction.

[0172] In some embodiments, the first wall 11 is also provided with a first protrusion 113 corresponding to the first recess 112, and the first protrusion 113 protrudes from the side surface of the first wall 11 away from the second insulating piece 50.

[0173] Exemplarily, the recessed area can be formed on the local part of the first wall 11 by stamping process, and the recessed area is embodied as the first recess 112 on the side of the first wall 11 facing the accommodating portion 41 in the thickness direction Z, and the recessed area is embodied as the first protrusion 113 on the side of the first wall 11 away from the second insulating piece 50 in the thickness direction Z.

[0174] The above technical solution can not only simplify the preparation process of the first recess 112, but also further improve the structural strength of the first wall 11 by the cooperation of the first recess 112 and the first protrusion 113.

[0175] In some embodiments, the number of accommodating portions 41 is multiple, and the multiple accommodating portions 41 are arranged at intervals along the circumference of the electrode terminal 20. The number of second insulating pieces 50 is multiple, and the multiple second insulating pieces 50 are arranged one by one corresponding to the multiple accommodating portions 41.

[0176] The number of accommodating portions 41 corresponds to the number of second insulating pieces 50. Exemplarily, the number of second insulating pieces 50 can be two, three, four or more; the number of accommodating portions 41 can be two, three, four or more.

[0177] The above technical solution can improve the uniformity of the support force exerted by the second insulating piece 50 on the electrode terminal 20, so as to improve the support effect of the second insulating piece 50 on the electrode terminal 20, thereby further improving the stability of the electrode terminal 20 when the battery monomer 7 is in thermal runaway and the first insulating piece 40 is melted or molten.

[0178] In some embodiments, the multiple accommodating portions 41 are equidistantly distributed along the circumference. The uniformity of the support force exerted by the second insulating piece 50 on the electrode terminal 20 can be further improved.

[0179] For example, the plurality of accommodating portions 41 are equidistantly distributed along the circumferential direction means that the interval of two adjacent accommodating portions 41 along the circumferential direction of the electrode terminal 20 is equal.

[0180] In some embodiments, the number of the second insulating members 50 and the accommodating portions 41 is three, and the three accommodating portions 41 are equidistantly distributed along the circumferential direction.

[0181] In some embodiments, the size of the accommodating portion 41 along the circumferential direction of the electrode terminal 20 is greater than the size of the accommodating portion 41 along the thickness direction Z.

[0182] For example, the accommodating portion 41 is arranged extending along the circumferential direction of the electrode terminal 20, in other words, the projection shape of the accommodating portion 41 along the thickness direction Z of the first wall 11 can be arc-shaped, semi-circular, or circular, etc.

[0183] The shape structure of the second insulating member 50 can be matched with the shape structure of the accommodating portion 41, or can be different from the shape structure of the accommodating portion 41.

[0184] For example, the shape structure of the second insulating member 50 can be matched with the shape structure of the accommodating portion 41, and the second insulating member 50 fills the entire accommodating portion 41.

[0185] For example, the shape structure of the second insulating member 50 can be different from the shape structure of the accommodating portion 41, and the number of the second insulating members 50 is multiple, and the multiple second insulating members 50 are arranged in the accommodating portion 41 along the extending direction of the accommodating portion 41.

[0186] The above technical solutions can provide more space for the arrangement of the second insulating member 50, improve the design flexibility of the second insulating member 50, and adapt to different application requirements.

[0187] In some embodiments, the second insulating member 50 is fixed to at least one of the electrode terminal 20 and the first wall 11.

[0188] For example, the second insulating member 50 can be fixed to the electrode terminal 20 and / or the first wall 11 by adhesion, crimping, or other means. For example, the electrode terminal 20 and the first wall 11 press the second insulating member 50 from both sides to achieve the fixation of the second insulating member 50.

[0189] Fixing the second insulating member 50 to the electrode terminal 20 and / or the first wall 11 can improve the stability of the second insulating member 50, reduce the displacement of the second insulating member 50 when the battery monomer 7 is subjected to external impact, and reduce the risk of insulation failure.

[0190] In some embodiments, the second insulating member 50 is adhered to at least one of the electrode terminal 20 and the first wall 11.

[0191] In some examples, the second insulating member 50 is bonded to the electrode terminal 20. The second insulating member 50 can be directly bonded to the electrode terminal 20, for example, an insulating material (e.g., a thermosetting material) having adhesion can be directly applied to the surface of the electrode terminal 20, and the insulating material forms the second insulating member 50 after curing. The second insulating member 50 can be bonded to the electrode terminal 20 by other materials, for example, a glue can be applied to the end of the second insulating member 50, and then bonded to the electrode terminal 20 by the glue.

[0192] In some examples, the second insulating member 50 is bonded to the first wall 11. The second insulating member 50 can be directly bonded to the first wall 11, for example, an insulating material (e.g., a thermosetting material) having adhesion can be directly applied to the surface of the first wall 11, and the insulating material forms the second insulating member 50 after curing. The second insulating member 50 can be bonded to the first wall 11 by other materials, for example, a glue can be applied to the end of the second insulating member 50, and then bonded to the first wall 11 by the glue.

[0193] In some examples, the second insulating member 50 is bonded to both the first wall 11 and the electrode terminal 20.

[0194] Bonding the second insulating member 50 to the electrode terminal 20 and / or the first wall 11 can improve the stability of the second insulating member 50, reduce the displacement of the second insulating member 50 when the battery cell 7 is subjected to external impact, and reduce the risk of insulation failure. The bonding process is easy to implement, and the bonding interface has good sealing performance.

[0195] In some embodiments, the second insulating member 50 is bonded to the first insulating member 40.

[0196] For example, the second insulating member 50 can be directly bonded to the first insulating member 40, for example, an insulating material (e.g., a thermosetting material) having adhesion can be directly applied to the inner surface of the accommodating portion 41, and the insulating material forms the second insulating member 50 after curing. The second insulating member 50 can be bonded to the first insulating member 40 by other materials, for example, a glue can be applied to the surface of the second insulating member 50, and then bonded to the inner surface of the accommodating portion 41 by the glue.

[0197] Bonding the second insulating member 50 to the first insulating member 40 can improve the stability of the second insulating member 50, reduce the displacement of the second insulating member 50 when the battery cell 7 is subjected to external impact, and reduce the risk of insulation failure. The bonding process is easy to implement, and the bonding interface has good sealing performance.

[0198] In some embodiments, the electrode terminal 20 includes a terminal body 21 and a first limiting portion 22, at least part of the terminal body 21 is accommodated in the electrode lead-out hole 111, the first limiting portion 22 is connected to the terminal body 21, and at least part of the first limiting portion 22 protrudes from the outer circumferential surface of the terminal body 21. In the thickness direction Z, the first limiting portion 22 is located outside the first wall 11, and the two ends of the second insulating member 50 abut against the first wall 11 and the first limiting portion 22, respectively.

[0199] In some examples, the first limiting portion 22 and the terminal body 21 can be an integrally formed structure. In other examples, the first limiting portion 22 and the terminal body 21 are independently formed and connected by welding, riveting, bonding or other means.

[0200] In some embodiments, in the thickness direction Z of the first wall 11, the first limiting portion at least partially overlaps the first wall 11.

[0201] The first wall 11 and the first limiting portion 22 can limit each other in the thickness direction Z, improving the stability of the electrode terminal 20.

[0202] In some embodiments, in the thickness direction Z of the first wall 11, at least part of the first insulating member 40 is located between the first wall 11 and the first limiting portion 22.

[0203] The first insulating member 40 can be located entirely between the first wall 11 and the first limiting portion 22, or only partially between the first wall 11 and the first limiting portion 22.

[0204] In some embodiments, in the thickness direction Z of the first wall 11, at least part of the second insulating member 50 is located between the first wall 11 and the first limiting portion 22.

[0205] The second insulating member 50 can be located entirely between the first wall 11 and the first limiting portion 22, or only partially between the first wall 11 and the first limiting portion 22.

[0206] When the battery cell 7 is in thermal runaway, the second insulating member 50 can be kept between the first limiting portion 22 and the first wall 11, reducing the risk of direct contact between the first limiting portion 22 and the first wall 11, thereby inhibiting the current between the electrode terminal 20 and the first wall 11, reducing the risk of the electrode terminal 20 and the shell 10 being in contact and conducting, thereby reducing the risk of short circuit of the battery cell 7 and improving the reliability of the battery cell 7.

[0207] In some embodiments, the first limiting portion 22 and the terminal body 21 are an integrally formed structure.

[0208] Figure 11 Another partial cross-sectional view of a battery cell 7 is provided for some embodiments of the present application.

[0209] With reference to both Figure 11 In some embodiments, the first limiting portion 22 is provided with a second recess 221 on the side facing the accommodating portion 41 in the thickness direction Z, and a portion of the second insulating member 50 is accommodated in the second recess 221.

[0210] The second recess 221 is typically shaped to match the shape of the second insulating member 50, and the second insulating member 50 is inserted into the second recess 221.

[0211] The second recess 221 can fix the second insulating member 50 to some extent, and can limit the displacement of the second insulating member 50 in the direction parallel to the plane in which the first wall 11 lies, thereby improving the stability of the second insulating member 50. This makes the second insulating member 50 less likely to shake or move when the battery cell 7 is in thermal runaway and the first insulating member 40 melts or melts, and can more effectively support the electrode terminal 20 to further reduce the risk of the electrode terminal 20 being in contact with the shell 10.

[0212] In some embodiments, the first wall 11 is provided with a first recess 112 on the side facing the accommodating portion 41 in the thickness direction Z, and a portion of the second insulating member 50 is accommodated in the first recess 112. The projection of the second recess 221 in the thickness direction Z at least partially overlaps the projection of the first recess 112 in the thickness direction Z.

[0213] The projection of the second recess 221 in the thickness direction Z can partially overlap the projection of the first recess 112 in the thickness direction Z, or can overlap.

[0214] The second insulating member 50 is inserted into the first recess 112 at one end in the thickness direction Z and into the second recess 221 at the other end, which can further improve the stability of the second insulating member 50.

[0215] In addition, the projection of the second recess 221 in the thickness direction Z at least partially overlaps the projection of the first recess 112 in the thickness direction Z, which can reduce the component of the support force exerted by the second insulating member 50 on the electrode terminal 20 and the first wall 11 in the direction intersecting the thickness direction Z, thereby improving the support effect of the second insulating member 50 on the electrode terminal 20. In addition, the extension length of the second insulating member 50 can be reduced, which helps to reduce the difficulty of installing the second insulating member 50.

[0216] In some embodiments, the electrode terminal 20 further comprises a second limiting portion 23 connected to the terminal body 21, at least a portion of the second limiting portion 23 protrudes from the outer circumferential surface of the terminal body 21, and the first limiting portion 22 and the second limiting portion 23 are respectively located on both sides of the first wall 11 in the thickness direction Z of the first wall 11, that is, the second limiting portion 23 is located on the inner side of the first wall 11.

[0217] In some examples, the second limiting portion 23 and the terminal body 21 can be an integrally formed structure. In other examples, the second limiting portion 23 and the terminal body 21 are independently formed, and the two are connected by welding, riveting, bonding or other means.

[0218] The first limiting portion 22 and the second limiting portion 23 can achieve fixation of the electrode terminal 20 in the thickness direction Z of the first wall 11.

[0219] In some embodiments, one of the first limiting portion 22 and the second limiting portion 23 is formed after the electrode terminal 20 passes through the electrode lead-out hole 111.

[0220] In some examples, the first limiting portion 22 is located on the outer side of the first wall 11, for example, the electrode terminal 20 is riveted to the first wall 11 from the outer side of the first wall 11 to form the first limiting portion 22. The second limiting portion 23 is located on the inner side of the first wall 11, for example, the electrode terminal 20 is riveted to the first wall 11 from the inner side of the first wall 11 to form the second limiting portion 23.

[0221] In some embodiments, the projection of the accommodating portion 41 in the thickness direction Z is circular. In other words, the accommodating portion 41 is a circular hole.

[0222] Exemplarily, the first insulating piece 40 can be perforated by laser to form the accommodating portion 41. The first insulating piece 40 and the accommodating portion 41 can also be formed simultaneously by an injection molding process.

[0223] The above technical solution helps to simplify the preparation process and reduce costs by setting the accommodating portion 41 as a circular hole.

[0224] Figure 12 For Figure 7 Partial enlarged and exploded structural schematic view of the first insulating piece 40 and the second insulating piece 50 at K.

[0225] With reference to Figure 12 In some embodiments, the projection of the accommodating portion 41 in the thickness direction Z is circular, and the first dimension r1 of the accommodating portion 41 in the radial direction thereof and the second dimension r2 of the second insulating piece 50 in the radial direction thereof satisfy the relationship: 0.05mm≤r2≤r1, 0.1mm≤r1≤4mm.

[0226] As an example, the first dimension r1 can be, but is not limited to, 0.1 mm, 0.15 mm, 0.2 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, etc. The second dimension r2 can be, but is not limited to, 0.05 mm, 0.1 mm, 0.12 mm, 0.18 mm, 0.4 mm, 0.6 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, etc.

[0227] It can be understood that the greater the first dimension r1 and the second dimension r2, the greater the space occupancy of the second insulation member 50, so that the energy density of the battery monomer 7 is smaller, and the better the insulation effect of the second insulation member 50. The smaller the first dimension r1 and the second dimension r2, the smaller the space occupancy of the second insulation member 50, so that the energy density of the battery monomer 7 is greater, and the worse the insulation effect of the second insulation member 50.

[0228] The above technical solutions can improve the insulation effect of the second insulation member 50 while reducing the impact on the energy density of the battery monomer 7 to a certain extent by setting the first dimension r1 and the second dimension r2 within the above range.

[0229] Optionally, 0.1 mm≤r2≤r1, 0.2 mm≤r1≤2 mm. The insulation effect of the second insulation member 50 can be further improved and the effect of reducing the impact on the energy density of the battery monomer 7 can be considered.

[0230] As an example, the first dimension r1 can be, but is not limited to, 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, etc. The second dimension r2 can be, but is not limited to, 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2 mm, etc.

[0231] In some embodiments, the third dimension h1 of the accommodating portion 41 along the thickness direction Z and the fourth dimension h2 of the second insulation member 50 along the thickness direction Z satisfy the relationship: 0.02 mm≤h1≤h2, 0.05 mm≤h2≤4 mm.

[0232] As an example, the third dimension h1 can be, but is not limited to, 0.02 mm, 0.15 mm, 0.2 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, etc. The fourth dimension h2 can be, but is not limited to, 0.05 mm, 0.1 mm, 0.12 mm, 0.18 mm, 0.4 mm, 0.6 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, etc.

[0233] It can be understood that the larger the third size h1 and the fourth size h2 are, the larger the space occupancy of the first insulation piece 40 and the second insulation piece 50 is, so that the energy density of the battery monomer 7 is smaller, and the insulation effect of the second insulation piece 50 is better. The smaller the third size h1 and the fourth size h2 are, the smaller the space occupancy of the first insulation piece 40 and the second insulation piece 50 is, so that the energy density of the battery monomer 7 is larger, and the insulation effect of the second insulation piece 50 is worse.

[0234] The above technical solution can improve the insulation effect of the second insulation piece 50 while reducing the influence on the energy density of the battery monomer 7 to a certain extent by setting the third size h1 and the fourth size h2 in the above range.

[0235] Optionally, 0.05mm≤h1≤h2, 0.1mm≤h2≤2mm. The insulation effect of the second insulation piece 50 can be further improved and the influence on the energy density of the battery monomer 7 can be reduced.

[0236] As an example, the third size h1 can be, but is not limited to, 0.05mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, etc. The fourth size h2 can be, but is not limited to, 0.1mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1mm, 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2mm, etc.

[0237] In some embodiments, the thermal weight loss temperature of the second insulation piece 50 is greater than or equal to 300℃.

[0238] As an example, the thermal weight loss temperature of the second insulation piece 50 can be 300℃, 350℃, 400℃, 450℃, 500℃, 550℃, 600℃, 650℃, 700℃, 750℃, 800℃, 850℃, 900℃, 950℃, or 1000℃.

[0239] By setting the thermal weight loss temperature of the second insulation piece 50 to satisfy the above range, the weight loss rate of the second insulation piece 50 when the battery monomer 7 is in thermal runaway can be effectively reduced, the risk of failure of the second insulation piece 50 can be reduced, the risk of the electrode terminal 20 and the shell 10 being overlapped and conducted can be reduced, thereby reducing the short circuit risk of the battery monomer 7 and improving the reliability of the battery monomer 7.

[0240] Optionally, the thermal weight loss temperature of the second insulation piece 50 is greater than or equal to 350℃. The weight loss rate of the second insulation piece 50 when the battery monomer 7 is in thermal runaway can be further reduced to further reduce the risk of failure of the second insulation piece 50.

[0241] In some embodiments, the second insulating member 50 is ceramic. Ceramic materials are readily available, low cost, and highly reliable.

[0242] Exemplarily, the second insulating member 50 can be made of aluminum oxide, titanium oxide, silicon oxide, zirconium oxide, glass, or the like. For example, the second insulating member 50 is a ceramic column.

[0243] In some embodiments, the material of the second insulating member 50 includes a thermosetting material.

[0244] Thermosetting materials have excellent heat resistance and can maintain good stability at high temperatures without being easily softened, deformed, or decomposed. When the battery cell 7 is in thermal runaway, the internal pressure of the shell 10 increases, which increases the risk of deformation of the first wall 11. When the first wall 11 deforms, the pressure on the second insulating member 50 increases. The second insulating member 50 containing a thermosetting material is not easily softened at high temperatures, which can reduce the deformation of the second insulating member 50 under pressure and reduce the risk of local thinning and puncture of the second insulating member 50, thereby improving the insulation performance and reducing the risk of insulation failure.

[0245] In some embodiments, the thermosetting material can include at least one of thermosetting polyimide, thermosetting phenolic resin, or other high-temperature resistant thermosetting materials.

[0246] In some embodiments, the material of the second insulating member 50 includes one or more of thermosetting polyimide and its derivatives.

[0247] Exemplarily, the derivative can refer to a product derived from the substitution of hydrogen atoms or atomic groups in a polymer with other atoms or atomic groups.

[0248] Thermosetting polyimide has excellent heat resistance. When the battery cell 7 is in thermal runaway, the second insulating member 50 containing thermosetting polyimide can maintain good performance stability in a high-temperature environment, and it is less likely to lose weight or lose less weight, thereby reducing the risk of insulation failure.

[0249] Thermosetting polyimide has high strength. When the battery cell 7 is in thermal runaway, the second insulating member 50 containing thermosetting polyimide can withstand a larger load, and it is less likely to crack or be punctured under the pressure of the first wall 11, thereby reducing the risk of insulation failure.

[0250] Thermosetting polyimide has low creep. During the long-term use of the battery cell 7, the second insulating member 50 containing thermosetting polyimide has less creep, and its size and shape can maintain good stability, thereby reducing the risk of insulation failure.

[0251] The thermosetting polyimide has good corrosion resistance. During the assembly or use of the battery cell 7, the second insulating piece 50 containing the thermosetting polyimide is not easy to be corroded by the electrolyte, thereby reducing the risk of insulation failure.

[0252] In some embodiments, the material of the second insulating piece 50 includes one or more of bismaleimide, acetylene group terminated polyimide, and norbornene diacid anhydride terminated polyimide.

[0253] The bismaleimide, acetylene group terminated polyimide, and norbornene diacid anhydride terminated polyimide have excellent high-temperature resistance, high mechanical strength, and strong chemical corrosion resistance.

[0254] In some embodiments, the material of the second insulating piece 50 includes polyimide-siloxane resin. The polyimide itself has high thermal stability, and the introduction of siloxane further enhances this property. The polyimide has high strength and modulus, and the addition of siloxane can adjust the mechanical properties of the material to some extent, making it have better toughness and impact resistance. At the same time, the polyimide-siloxane resin also has high elongation at break, which makes the second insulating piece 50 be able to deform to some extent without being easily broken when subjected to external force, thereby improving the reliability and service life of the second insulating piece 50.

[0255] In some embodiments, the material of the second insulating piece 50 includes cyanate resin modified polyimide. The cyanate resin itself has high heat resistance, and the generated triazine ring structure makes it stable at high temperatures. Polyimide is also a high-temperature resistant material, and after combining the two, the heat resistance of the modified material is further improved, and the thermal decomposition temperature is increased, which can still maintain good performance in a high-temperature environment. The polyimide has excellent strength and modulus, which can enhance the mechanical properties of the cyanate resin. The modified material has high tensile strength, bending strength, and hardness, etc., while still maintaining good toughness and impact resistance, so that it is not easy to be damaged when subjected to external force.

[0256] In some embodiments, the material of the second insulating piece 50 includes thermosetting phenolic resin. The thermosetting phenolic resin has good heat resistance, dimensional stability, and corrosion resistance.

[0257] When the battery cell 7 is in thermal runaway, the second insulating piece 50 containing the thermosetting phenolic resin can maintain good performance stability in a high-temperature environment, and it is not easy to lose weight or lose weight, thereby reducing the risk of insulation failure. The three-dimensional network structure formed after the thermosetting phenolic resin is cured makes it have good dimensional stability, and during the long-term use of the battery cell 7, the size and shape of the second insulating piece 50 containing the thermosetting polyimide can maintain good stability, thereby reducing the risk of insulation failure.

[0258] According to some embodiments of the present application, the present application also provides a battery device comprising the battery cell 7 of any of the above solutions.

[0259] In some embodiments, at least two battery cells 7 are connected in parallel.

[0260] Exemplarily, at least two battery cells 7 are connected in parallel and form a battery unit, and a plurality of battery units are connected in series. The plurality of battery cells 7 of the battery device form a multi-parallel and series structure. The multi-parallel and series structure can improve reliability. When a certain battery cell 7 fails due to an accident (such as thermal runaway), the battery cells 7 connected in parallel with the battery cell 7 can still work normally, reducing the risk of complete failure of the entire circuit.

[0261] When a certain battery cell 7 is in thermal runaway, the normal battery cells 7 connected in parallel with the battery cell 7 in thermal runaway can be respectively electrically connected to the first wall 11 and the electrode terminal 20 of the battery cell 7 in thermal runaway. The second insulating member 50 can inhibit the current between the electrode terminal 20 and the first wall 11, reduce the continuous heat generation of the electrode terminal 20 and the first wall 11, reduce the heat impact on other battery cells 7 around, reduce the risk of thermal runaway of other battery cells 7, and improve the reliability.

[0262] According to some embodiments of the present application, the present application also provides a power utilization device comprising the battery cell 7 or the battery device of any of the above solutions, and the battery cell 7 or the battery device is used for storing or providing electric energy.

[0263] If not specifically stated, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions. All technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0264] In order to better understand the battery cell 7 provided by the embodiments of the present application, based on the same inventive concept, the above-mentioned battery cell 7 in actual application is provided for description.

[0265] The embodiment of the present application provides a battery monomer 7, the battery monomer 7 includes a shell 10, an electrode terminal 20, an electrode assembly 30, a first insulating piece 40 and a plurality of second insulating pieces 50, the shell 10 has a first wall 11 and a containing cavity 12, the first wall 11 is provided with an electrode lead-out hole 111 in communication with the containing cavity 12. The electrode terminal 20 is arranged at the electrode lead-out hole 111. The electrode terminal 20 includes a terminal body 21 and a first limiting portion 22, at least part of the terminal body 21 is contained in the electrode lead-out hole 111, the first limiting portion 22 is connected to the terminal body 21, at least part of the first limiting portion 22 protrudes from the outer peripheral surface of the terminal body 21, and the first limiting portion 22 is located outside the first wall 11 along the thickness direction Z. The electrode assembly 30 is contained in the containing cavity 12, and the electrode assembly 30 includes a first tab 31 and a second tab 32 with opposite polarities, the first tab 31 is electrically connected to the electrode terminal 20, and the second tab 32 is electrically connected to the first wall 11.

[0266] At least part of the first insulating piece 40 is arranged between the electrode terminal 20 and the first wall 11, the first insulating piece 40 is provided with a plurality of containing portions 41, the plurality of containing portions 41 are arranged at intervals along the circumference of the electrode terminal 20, and the containing portion 41 penetrates the first insulating piece 40 along the thickness direction Z of the first wall 11.

[0267] The plurality of second insulating pieces 50 are arranged in one-to-one correspondence with the plurality of containing portions 41, at least part of the second insulating piece 50 is contained in the containing portion 41, two ends of the second insulating piece 50 are respectively in abutment with the first wall 11 and the first limiting portion 22 along the thickness direction Z, and the thermal weight loss temperature of the second insulating piece 50 is greater than the thermal weight loss temperature of the first insulating piece 40. The thermal weight loss temperature of the second insulating piece 50 is greater than or equal to 350 DEG C.

[0268] Wherein, on the thickness direction Z, the side of the first wall 11 facing the containing portion 41 is provided with a first recess 112, and part of the second insulating piece 50 is contained in the first recess 112.

[0269] The above technical solution sets the second insulating piece 50 with a higher thermal weight loss temperature between the first wall 11 and the electrode terminal 20, so that when the battery monomer 7 is in thermal runaway, the second insulating piece 50 can have a stable structure form, even if the first insulating piece 40 melts or melts, the second insulating piece 50 can insulate and separate the electrode terminal 20 and the first wall 11, and can support the electrode terminal 20, reduce the risk of the electrode terminal 20 and the shell 10 being overlapped and conducted, thereby reducing the short circuit risk of the battery monomer 7 and improving the reliability of the battery monomer 7.

[0270] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0271] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. 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 by, The application relates to a battery case, comprising: a case body having a first wall and a receiving cavity, the first wall being provided with an electrode lead-out hole communicating with the receiving cavity; an electrode terminal provided in the electrode lead-out hole; an electrode assembly accommodated in the receiving cavity, the electrode assembly comprising first and second polar tabs with opposite polarities, the first polar tab being electrically connected to the electrode terminal, and the second polar tab being electrically connected to the first wall; a first insulating member at least partially arranged between the electrode terminal and the first wall, the first insulating member being provided with a receiving portion penetrating the first insulating member along a thickness direction of the first wall; a second insulating member at least partially accommodated in the receiving portion, two ends of the second insulating member being respectively in abutment with the first wall and the electrode terminal along the thickness direction, and the second insulating member having a thermal weight loss temperature greater than that of the first insulating member.

2. The battery cell of claim 1, wherein, In the thickness direction, one side of the first wall facing the receiving portion is provided with a first recess, and a portion of the second insulating member is accommodated in the first recess.

3. The battery cell of claim 2, wherein, The first wall is further provided with a first protrusion corresponding to the first recess, the first protrusion protruding from a side surface of the first wall away from the second insulating member.

4. The battery cell of claim 1, wherein, The number of the receiving portions is plural, and the plural receiving portions are arranged at intervals along a circumferential direction of the electrode terminal. The number of the second insulating members is plural, and the plural second insulating members are arranged in one-to-one correspondence with the plural receiving portions.

5. The battery cell of claim 4, wherein, The plural receiving portions are equidistantly distributed along the circumferential direction.

6. The battery cell of claim 1, wherein, The size of the receiving portion along the circumferential direction of the electrode terminal is greater than the size of the receiving portion along the thickness direction.

7. The battery cell of claim 1, wherein, The second insulating member is bonded to the first insulating member.

8. The battery cell of claim 1, wherein, The electrode terminal comprises a terminal body and a first limiting portion, at least a portion of the terminal body is accommodated in the electrode lead-out hole, the first limiting portion is connected to the terminal body, and at least a portion of the first limiting portion protrudes from an outer circumferential surface of the terminal body. Along the thickness direction, the first limiting portion is located outside the first wall, and two ends of the second insulating member are respectively in abutment with the first wall and the first limiting portion.

9. The battery cell of claim 8, wherein, In the thickness direction, one side of the first limiting portion facing the receiving portion is provided with a second recess, and a portion of the second insulating member is accommodated in the second recess.

10. The battery cell of claim 9, wherein, In the thickness direction, one side of the first wall facing the receiving portion is provided with a first recess, and a portion of the second insulating member is accommodated in the first recess. The projection of the receiving portion along the thickness direction at least partially overlaps the projection of the first recess along the thickness direction.

11. The battery cell of claim 1, wherein, The projection of the receiving portion along the thickness direction is circular.

12. The battery cell of claim 11, wherein, The first size r1 of the receiving portion along a radial direction and the second size r2 of the second insulating member along the radial direction satisfy the relationship: 0.05mm<=r2<=r1, 0.1mm<=r1<=4mm. Optionally, 0.1mm<=r2<=r1, 0.2mm<=r1<=2mm.

13. The battery cell of claim 1, wherein, The third dimension h1 of the accommodation portion along the thickness direction and the fourth dimension h2 of the second insulating member along the thickness direction satisfy the relationship: 0.02mm≤h1≤h2, 0.05mm≤h2≤4mm; Optionally, 0.05mm≤h1≤h2, 0.1mm≤h2≤2mm.

14. The battery cell of claim 1, wherein, The thermal weight loss temperature of the second insulating member is greater than or equal to 300℃, and optionally, the thermal weight loss temperature of the second insulating member is greater than or equal to 350℃.

15. The battery cell of any one of claims 1-14, wherein, The second insulating member is ceramic.

16. A battery device characterized by comprising: A plurality of battery cells as claimed in any one of claims 1-15.

17. The battery device of claim 16, wherein, At least two of the battery cells are connected in parallel.

18. An electrical device, comprising: A battery cell as claimed in any one of claims 1-15 or a battery device as claimed in claim 16 or 17, for storing or providing electrical energy.

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