Battery monomer, battery device and power utilization device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The electrode assembly is located in a space defined by the shell and the end cover, and the arrangement direction of the electrode assembly and the end cover is a preset direction. The insulating part is located between the end cover and the electrode assembly, a protective cover of the insulating part protrudes out of the side, facing the electrode assembly, of the insulating part, the surface of the side, facing the electrode assembly, of the protective cover is a first surface, and the projection area of the pressure relief mechanism and the projection area of the protective cover are at least partially overlapped in the preset direction. The first reinforcing part is located on the side, away from the electrode assembly, of the first surface in the preset direction and connected to the side, facing the electrode assembly, of the insulating part, and the projection area of the first reinforcing part is at least partially located outside the projection area of the protective cover in the preset direction. The warping degree of the insulating part is reduced through the first reinforcing part.

Description

Technical Field

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

[0002] Batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are increasingly being used in the field of energy storage.

[0003] In related technologies, the insulating component located between the end cap and the electrode assembly may warp. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a battery cell, a battery device, and an electrical device to reduce the degree of warping of the insulating components.

[0005] This application is achieved through the following technical solution.

[0006] A first aspect of this application provides a battery cell, comprising:

[0007] An outer casing, comprising a housing and an end cap, wherein the end cap covers the housing;

[0008] The electrode assembly is located within the space enclosed by the housing and the end cap, and the electrode assembly and the end cap are arranged in a preset direction;

[0009] A pressure relief mechanism is installed on the end cap;

[0010] An insulating element is located between the end cap and the electrode assembly. The insulating element has a protective cover that protrudes from the side of the insulating element facing the electrode assembly. The surface of the protective cover facing the electrode assembly is a first surface. Along the preset direction, the projection area of ​​the pressure relief mechanism and the projection area of ​​the protective cover at least partially overlap.

[0011] A first reinforcing member is connected to the side of the insulating member facing the electrode assembly. The first reinforcing member is located on the side of the first surface facing away from the electrode assembly along the preset direction. Along the preset direction, the projection area of ​​the first reinforcing member is at least partially located outside the projection area of ​​the protective cover.

[0012] In this embodiment, by providing a first reinforcing member on the side of the insulating member facing the electrode assembly, and with the projection area of ​​the first reinforcing member along a preset direction at least partially located outside the projection area of ​​the protective cover, the first reinforcing member strengthens the area near the protective cover, reducing the degree of warping of the insulating member. The surface of the protective cover facing the electrode assembly is a first surface. Since the first reinforcing member is located on the side of the first surface facing away from the electrode assembly along the preset direction, the first reinforcing member can, to a certain extent, avoid structures such as the tabs of the electrode assembly that are electrically connected to the electrode terminals. The first reinforcing member can simultaneously strengthen the insulating member near the protective cover and reduce interference with structures such as the tabs of the electrode assembly that are electrically connected to the electrode terminals.

[0013] In some embodiments, the first reinforcement is connected to the protective cover.

[0014] In this embodiment, the strength of the protective shield is improved.

[0015] In some embodiments, the surface of the first reinforcing member facing the electrode assembly is a second surface, and the first surface and the second surface are connected.

[0016] In this embodiment, the first surface and the second surface are connected, so that the first reinforcing member can be as close as possible to the protective cover. This is beneficial for the first reinforcing member to better strengthen the area near the protective cover and reduce the degree of warping of the insulating member near the protective cover.

[0017] In some embodiments, the distance between the first surface and the second surface along the preset direction is a preset distance, which gradually decreases from the end of the second surface closer to the protective cover to the end of the second surface farther from the protective cover.

[0018] In this embodiment, the preset distance gradually decreases from the end of the second surface near the protective cover to the end of the second surface away from the protective cover. This makes the second surface of the first reinforcing member facing the electrode assembly further away from the protective cover in the preset direction. On the one hand, this makes the first reinforcing member have a larger thickness in the preset direction near the protective cover, which is beneficial for reinforcing the area near the protective cover and reducing the warping of the insulating member in the area near the protective cover. On the other hand, the first reinforcing member can be as far away from the electrode assembly as possible in the preset direction from the protective cover, which is beneficial for avoiding structures such as the tabs of the electrode assembly that are electrically connected to the electrode terminals.

[0019] In some embodiments, the recessed direction of the second surface is opposite to that of the electrode assembly.

[0020] In this embodiment, the recessed direction of the second surface is away from the electrode assembly, which makes the preset distance of the second surface near the protective cover change significantly. This is beneficial for the first reinforcing member to better avoid structures such as the tabs that are electrically connected to the electrode terminals.

[0021] In some embodiments, the battery cell further includes an electrode terminal electrically connected to the electrode assembly, the electrode terminal penetrating the end cap and the insulating member, the electrode terminal being spaced apart from the pressure relief mechanism, and the protective cover having the first reinforcing member on both opposite sides along the arrangement direction of the electrode terminal and the pressure relief mechanism.

[0022] In this embodiment, the electrode terminals and the pressure relief mechanism are arranged at intervals. The space between the electrode terminals and the pressure relief mechanism can be used to arrange the first reinforcing member. The first reinforcing member is provided on both sides of the protective cover along the arrangement direction of the electrode terminals and the pressure relief mechanism, so that both sides of the protective cover can be strengthened to a certain extent. This is beneficial to improving the strength of the insulating member near the protective cover and reducing the degree of warping of the insulating member near the protective cover.

[0023] In some embodiments, the first reinforcing member and the insulating member are integrally formed.

[0024] In this embodiment, the first reinforcing member and the insulating member are integrally formed, resulting in better overall integrity of the insulating member and the first reinforcing member that strengthens the insulating member, which is beneficial to improving the strength of the insulating member. The integral forming of the first reinforcing member and the insulating member reduces the number of parts and simplifies the assembly of the battery cell.

[0025] In some embodiments, the battery cell further includes a second reinforcing member connected to the side of the insulating member facing the end cap. The second reinforcing member is strip-shaped and its projection area is located outside the projection area of ​​the protective cover along the preset direction.

[0026] In this embodiment, a strip-shaped second reinforcing member is provided on the side of the insulating member facing the end cap, and the projection area of ​​the second reinforcing member is located outside the projection area of ​​the buffer cavity. This allows the second reinforcing member to strengthen the area of ​​the insulating member outside the buffer cavity, thereby increasing the strength of the insulating member outside the buffer zone and reducing the degree of warping of the insulating member outside the buffer zone.

[0027] In some embodiments, the insulating member has a hot-dip rivet on the side facing the end cap that is riveted to the end cap, and the second reinforcing member is connected to the hot-dip rivet.

[0028] In this embodiment, the hot riveting post is connected to the end cap, and the second reinforcing member is connected to the hot riveting post. To a certain extent, the insulating member is constrained by the end cap at the position corresponding to the hot riveting post, which can reduce the warping of the insulating member at the position corresponding to the hot riveting post. The second reinforcing member connected to the hot riveting post is traction-constrained by the hot riveting post, which can reduce the warping of the insulating member at the position of the second reinforcing member.

[0029] In some embodiments, the two ends of the second reinforcing member are respectively connected to the corresponding hot-riveting post.

[0030] In this embodiment, in at least two second reinforcing members, each second reinforcing member has its two ends connected to the corresponding hot riveting post. The two ends of the second reinforcing member are constrained by the hot riveting post, which helps to improve the strength of the insulating member and reduce the degree of warping of the insulating member at the second reinforcing member.

[0031] In some embodiments, the end cap is provided with a groove, the second reinforcement is partially located within the groove of the end cap, and the second reinforcement is connected to the end cap.

[0032] In this embodiment, the second reinforcing member is connected to the end cap. By constraining the second reinforcing member through the end cap, the strength of the insulating member at the location of the second reinforcing member is improved, and the degree of warping of the insulating member at the location of the second reinforcing member is reduced.

[0033] In some embodiments, the battery cell has an injection hole communicating with the space enclosed by the housing and the end cap, the injection hole penetrating the end cap and the insulating member, and at least two second reinforcing members are clearance ribs, the at least two clearance ribs being arranged circumferentially along the injection hole, the clearance ribs being offset from the injection hole.

[0034] In this embodiment, since the avoidance ribs are staggered from the injection holes, the arrangement of the avoidance ribs does not affect the injection of liquid into the injection holes. At least two of the avoidance ribs are arranged circumferentially around the injection holes, which improves the strength of the insulating component near the circumferential location of the injection holes to a certain extent, reducing the possibility of the insulating component warping near the injection holes.

[0035] In some embodiments, at least two of the clearance ribs are arranged sequentially along the circumference of the injection hole; or, each of the clearance ribs extends at least partially along the circumference of the injection hole, and the two clearance ribs are arranged intersectingly to form two intersecting positions.

[0036] In some embodiments, the battery cell has an injection hole communicating with the space enclosed by the housing and the end cap, the injection hole penetrating the end cap and the insulating member, and at least two second reinforcing members located on the side of the protective cover opposite to the injection hole are arranged crosswise to form an intersection position.

[0037] In this embodiment, at least two second reinforcing members located on the side of the protective cover away from the injection hole are arranged crosswise to form an intersection. The insulating member has high strength at the corresponding intersection, reducing the possibility of the insulating member warping at the corresponding intersection. The arrangement of at least two second reinforcing members on the side of the protective cover away from the injection hole to form an intersection is simple in structure, does not require avoiding the injection hole, and is convenient to manufacture.

[0038] In some embodiments, the second reinforcing member is integrally formed with the insulating member.

[0039] In this embodiment, the second reinforcing member and the insulating member are integrally formed, resulting in better overall structural integrity and improving the strength of the insulating member. Integrating the second reinforcing member and the insulating member reduces the number of components and simplifies the assembly of the battery cells.

[0040] A second aspect of this application provides a battery device including a battery cell from any of the above embodiments, the battery cell being used to store or provide electrical energy.

[0041] A third aspect of this application provides an electrical device, including a battery cell or a battery device of any of the above embodiments, wherein the battery cell or the battery device is used to store or provide electrical energy.

[0042] Beneficial effects

[0043] In the battery cell of this application embodiment, a first reinforcing member is provided on the side of the insulating member facing the electrode assembly, and the projection area of ​​the first reinforcing member along a predetermined direction is at least partially located outside the projection area of ​​the protective cover. This strengthens the area near the protective cover, reduces the degree of warping of the insulating member, and lowers the possibility of the tabs being squeezed and broken. The surface of the protective cover facing the electrode assembly is a first surface. Since the first reinforcing member is located on the side of the first surface facing away from the electrode assembly along the predetermined direction, the first reinforcing member can, to a certain extent, avoid the structures such as the tabs of the electrode assembly that are electrically connected to the electrode terminals. The first reinforcing member can simultaneously strengthen the insulating member near the protective cover and reduce interference with the structures such as the tabs of the electrode assembly that are electrically connected to the electrode terminals. Attached Figure Description

[0044] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0045] Figure 1 This is a schematic diagram of the structure of the electrical device according to an embodiment of this application;

[0046] Figure 2 This is a schematic diagram of the battery device according to an embodiment of this application;

[0047] Figure 3 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application;

[0048] Figure 4 This is an exploded view of the end cap, insulating component, adapter plate, electrode terminal, and pressure relief mechanism according to an embodiment of this application.

[0049] Figure 5 This is a schematic diagram of the structure of the insulating member, the first reinforcing member, and the second reinforcing member according to an embodiment of this application.

[0050] Explanation of reference numerals in the attached figures

[0051] 1000, Vehicle; 100, Battery Unit; 200, Controller; 300, Motor; 400, Housing; 401, First Housing; 402, Second Housing; 500, Battery Cell; 1, Outer Shell; 11, Housing; 12, End Cap; 2, Electrode Assembly; 3, Electrode Terminal; 4, Pressure Relief Mechanism; 5, Insulating Component; 51, Protective Cover; 511, Buffer Chamber; 512, First Surface; 52, Hot Riveting Post; 53, Mounting Hole; 6, First Reinforcing Component; 61, Second Surface; 7, Second Reinforcing Component; 8, Injection Hole; 9, Adapter Plate. Detailed Implementation

[0052] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0054] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0055] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0056] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0057] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0058] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0059] In related technologies, the outer casing of a battery cell includes an end cap and a housing. The end cap covers the housing, and the electrode assembly is located within the space enclosed by the end cap and the housing. An insulating component is provided between the electrode assembly and the end cap to reduce the possibility of short circuit between the electrode assembly and the end cap. Because the additives and color masterbatch particles in the insulating component material are highly electrolyte-loving, the insulating component undergoes a swelling reaction when immersed in the electrolyte. During the electrolyte injection formation process, the insulating component comes into contact with a large amount of electrolyte, causing it to swell. This leads to deformation and warping of the insulating component at locations with lower strength, potentially squeezing the electrode assembly. Under the squeezing action of the insulating component, the tabs of the electrode assembly may break. The electrode assembly and the end cap are arranged in a predetermined direction. A pressure relief mechanism is installed on the end cap. Along the predetermined direction, the projection area of ​​the pressure relief mechanism and the projection area of ​​the protective cover at least partially overlap. The strength of the insulating component is weaker at the location of the protective cover, making swelling and deformation more likely in the vicinity of the protective cover.

[0060] This embodiment of the application strengthens the area near the protective cover by providing a first reinforcing member on the side of the insulating member facing the electrode assembly, and the projection area of ​​the first reinforcing member along a preset direction is at least partially located outside the projection area of ​​the protective cover. The surface of the protective cover facing the electrode assembly is the first surface. Since the first reinforcing member is located on the side of the first surface facing away from the electrode assembly along a preset direction, the first reinforcing member can, to a certain extent, avoid structures such as the electrode tabs of the electrode assembly that are electrically connected to the electrode terminals.

[0061] The solutions in this application are not limited to battery cells, but can also be used in battery devices and electrical devices.

[0062] This application provides an electrical device; please refer to [link / reference]. Figure 1 This includes individual battery cells or battery devices used to store or provide electrical energy.

[0063] In one embodiment, the electrical device further includes a device body, and a battery device or battery cell is mounted on the device body to supply power to the device body.

[0064] Electrical devices are devices that use electrical energy as their energy source to perform corresponding functions by consuming electrical energy. For example, electrical devices can be, but are 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.

[0065] The main body of a device refers to the main structure that consumes electrical energy to perform its corresponding functions. For example, an electrical device can be a mobile phone, where the main body is the part that enables communication and other functions, powered by individual battery cells or battery packs. Similarly, an electrical device can be a car, where the main body is the part that provides seating and allows the vehicle to move on the road, powered by individual battery cells or battery packs.

[0066] The following description will be based on an embodiment of the present application where the electrical device is a vehicle 1000.

[0067] One embodiment of this application provides a vehicle 1000 that can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended vehicle, etc. Please refer to... Figure 2 The vehicle 1000 has a battery device 100 installed inside, which can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the vehicle 1000's operating power source. The vehicle 1000 may also include a controller 200 and a motor 300, whereby the controller 200 can control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can meet the power needs of the vehicle 1000 during startup, navigation, and operation.

[0068] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0069] In one embodiment, the battery device 100 may be a battery pack.

[0070] In one embodiment, the battery device 100 can be an energy storage device.

[0071] The battery device 100 of this application embodiment includes a battery cell 500. The battery cell 500 is used to store or provide electrical energy.

[0072] In this embodiment of the application, the battery cell 500 can be a secondary battery. A secondary battery refers to a battery cell 500 that can be used again after being discharged by recharging to activate the active materials.

[0073] The battery cell 500 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0074] The battery cell 500 includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell 500, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through. In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0075] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0076] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may 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, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0078] In one embodiment, please refer to Figure 2 The battery device 100 also includes a housing 400, and individual battery cells 500 are installed inside the housing 400.

[0079] For example, the housing 400 may include a first housing 401 and a second housing 402. The first housing 401 and the second housing 402 are fastened together to form a closed space inside the housing 400 to accommodate the battery cells 500. Here, "closed" refers to covering or closing, and can be sealed or unsealed. The first housing 401 may be a top cover or a bottom plate.

[0080] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0081] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0082] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0083] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0084] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cell 500. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cell 500 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0085] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0086] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0087] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0088] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0089] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0090] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0091] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0092] In some embodiments, the battery cell 500 also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0093] Liquid electrolytes include electrolyte salts and solvents.

[0094] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0095] In some embodiments, the solvent may 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, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may 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 ethers.

[0096] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain performance of the battery cell 500, such as additives that improve the overcharge / fast charge performance of the battery cell 500, additives that improve the high-temperature performance of the battery cell 500, additives that improve the low-temperature performance of the battery cell 500, etc.

[0097] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0098] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0099] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0100] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0101] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0102] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0103] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0104] In some implementations, the electrode assembly is a stacked structure.

[0105] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0106] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0107] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0108] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0109] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0110] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0111] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0112] For the battery cell 500 in this embodiment, please refer to [link / reference needed]. Figures 3-5The battery cell 500 includes a housing 1, an electrode assembly 2, a pressure relief mechanism 4, an insulating member 5, and a first reinforcing member 6. The housing 1 includes a shell 11 and an end cap 12, with the end cap 12 covering the shell 11. The electrode assembly 2 is located within the space enclosed by the shell 11 and the end cap 12, and the electrode assembly 2 and the end cap 12 are arranged in a predetermined direction. The pressure relief mechanism 4 is mounted on the end cap 12. The insulating member 5 is located between the end cap 12 and the electrode assembly 2, and the insulating member 5 has a protective cover 51. The protective cover 51 protrudes from the side of the insulating member 5 facing the electrode assembly 2, and the surface of the protective cover 51 facing the electrode assembly 2 is a first surface 512. Along the predetermined direction, the projection area of ​​the pressure relief mechanism 4 and the projection area of ​​the protective cover 51 at least partially overlap. The first reinforcing member 6 is connected to the side of the insulating member 5 facing the electrode assembly 2. The first reinforcing member 6 is located on the side of the first surface 512 facing away from the electrode assembly 2 along the predetermined direction, and along the predetermined direction, the projection area of ​​the first reinforcing member 6 is at least partially outside the projection area of ​​the protective cover 51.

[0113] The outer casing 1 is mainly used to house the electrode assembly 2, retain the electrode assembly 2, and reduce the damage to the electrode assembly 2 caused by the external environment.

[0114] The housing 11 is the main part of the outer shell 1, providing a space for the electrode assembly 2.

[0115] The end cap 12 is placed on the housing 11. After the electrode assembly 2 is installed on the housing 11, the end cap 12 is placed on the housing 11 to reduce the possibility of the electrode assembly 2 coming out of the housing 11.

[0116] Electrode assembly 2 includes a positive electrode, a negative electrode, and an insulating element located between the positive and negative electrodes.

[0117] The electrode assembly 2 has tabs, and the battery cell 500 also includes an electrode terminal 3, which is electrically connected to the tabs and is mounted on the housing 1.

[0118] For example, both the positive and negative electrodes have tabs.

[0119] The battery cell 500 provides electrical energy to the outside through the electrode terminal 3, or charges the battery cell 500 through the electrode terminal 3.

[0120] For example, electrode terminal 3 can be a pole post.

[0121] The pressure relief mechanism 4 is used to discharge the thermal runaway ejected material inside the casing 1 in the event of thermal runaway in the battery cell 500.

[0122] For example, the pressure relief mechanism 4 is an explosion-proof valve.

[0123] For example, the insulating element 5 is a lower plastic.

[0124] For example, the insulating element 5 is made of polypropylene.

[0125] For example, the electrode terminal 3 is mounted on the end cap 12, and the insulating member 5 is partially clamped between the electrode terminal 3 and the end cap 12.

[0126] For example, the first reinforcement 6 is connected to the protruding protective cover 51 and other structures on the insulating member 5 other than the protective cover 51.

[0127] For example, the material of the first reinforcing member 6 may be the same as or different from the material of the insulating member 5.

[0128] For example, the battery cell 500 is a square-shell battery cell 500, and the outer shell 1 is cubic in shape.

[0129] For example, please refer to Figure 4 The battery cell 500 also includes an adapter 9, which is connected to the tab and the electrode terminal 3 respectively so that the tab and the electrode terminal 3 are electrically connected.

[0130] For example, please refer to Figure 3 and Figure 4 The direction indicated by arrow R1 in the figure is the preset direction.

[0131] Exemplarily, the protective cover 51 has a buffer cavity 511 on the side facing the pressure relief mechanism 4, and the projection area of ​​the pressure relief mechanism 4 and the projection area of ​​the buffer cavity 511 at least partially overlap. The protective cover 51 protruding from the insulating member 5 towards the electrode assembly 2 can, to a certain extent, suppress the electrode assembly 2 from squeezing the explosion-proof valve. The buffer cavity 511 of the protective cover 51 provides a discharge space for the ejected material from the battery cell 500 in the event of thermal runaway, reducing the possibility that the electrode assembly 2 may push the insulating member 5 to block the discharge path of the pressure relief mechanism 4 in the event of thermal runaway, making it difficult to open the pressure relief mechanism 4. Since the projection area of ​​the first reinforcing member 6 is at least partially located outside the projection area of ​​the protective cover 51 along the preset direction, the first reinforcing member 6 does not need to occupy the space of the buffer cavity 511 or the space of the protective cover 51 towards the electrode assembly 2 along the preset direction.

[0132] In this embodiment, by providing a first reinforcing member 6 on the side of the insulating member 5 facing the electrode assembly 2, and with the projection area of ​​the first reinforcing member 6 along a preset direction at least partially located outside the projection area of ​​the protective cover 51, the first reinforcing member 6 strengthens the area near the protective cover 51, reducing the degree of warping of the insulating member 5 and lowering the possibility of the tab being squeezed and broken. The surface of the protective cover 51 facing the electrode assembly 2 is the first surface 512. Since the first reinforcing member 6 is located on the side of the first surface 512 away from the electrode assembly 2 along a preset direction, the first reinforcing member 6 can, to a certain extent, avoid the structure of the electrode assembly 2, such as the tab, which is electrically connected to the electrode terminal 3. The first reinforcing member 6 can simultaneously strengthen the insulating member 5 near the protective cover 51 and reduce interference with the structure of the electrode assembly 2, such as the tab, which is electrically connected to the electrode terminal 3.

[0133] In some embodiments, please refer to Figure 5 The surface of the first reinforcing member 6 facing the electrode assembly 2 is the second surface 61. The distance between the first surface 512 and the second surface 61 along a preset direction is the preset distance. The preset distance gradually decreases from the end of the second surface 61 that is close to the protective cover 51 to the end of the second surface 61 that is far away from the protective cover 51.

[0134] It should be explained that the preset distance at some locations can be zero, and some locations on the second surface 61 can be flush with the first surface 512.

[0135] For example, the preset direction is arranged in the vertical direction, the end cap 12 is located above the housing 11, the first reinforcing member 6 is connected to the lower side of the insulating member 5, and the second surface 61 is the surface of the lower side of the first reinforcing member 6.

[0136] The preset distance gradually decreases from the end of the second surface 61 that is close to the protective cover 51 to the end of the second surface 61 that is far away from the protective cover 51. The further away the second surface 61 is from the protective cover 51, the closer it is to the end cap 12. The further away the second surface 61 is from the protective cover 51, the further it is from the electrode assembly 2.

[0137] For example, please refer to Figure 5 The preset distance is the distance shown in dimension D1.

[0138] In this embodiment, the preset distance gradually decreases from the end of the second surface 61 near the protective cover 51 to the end of the second surface 61 away from the protective cover 51. This makes the second surface 61 on the side of the first reinforcing member 6 facing the electrode assembly 2 further away from the protective cover 51 in the preset direction. On the one hand, this makes the first reinforcing member 6 have a larger thickness in the preset direction near the protective cover 51, which is beneficial for reinforcing the area near the protective cover 51 and reducing the warping of the insulating member 5 in the area near the protective cover 51. On the other hand, the first reinforcing member 6 can be as far away from the electrode assembly 2 as possible in the preset direction from the protective cover 51, which is beneficial for avoiding the structure of the electrode assembly 2, such as the tabs, which are electrically connected to the electrode terminals 3.

[0139] It is understood that the arrangement of the second surface 61 of the first reinforcing member 6 is not limited. Exemplarily, the preset distance from the end of the second surface 61 near the protective cover 51 to the end of the second surface 61 away from the protective cover 51 can remain substantially unchanged, the first surface 512 and the second surface 61 are arranged at intervals, and the second surface 61 is located on the side of the first surface 512 away from the electrode assembly 2 along a preset direction.

[0140] In some embodiments, please refer to Figure 5 The surface of the first reinforcing member 6 facing the electrode assembly 2 is the second surface 61, and the first surface 512 and the second surface 61 are connected.

[0141] The first surface 512 is connected to the second surface 61, and the first reinforcing member 6 is in contact with the protective cover 51.

[0142] For example, the first reinforcing member 6 is connected to the protective cover 51.

[0143] In this embodiment, the first surface 512 and the second surface 61 are connected, so that the first reinforcing member 6 can be as close as possible to the protective cover 51. This is beneficial for the first reinforcing member 6 to better strengthen the area near the protective cover 51 and reduce the degree of warping of the insulating member 5 near the protective cover 51.

[0144] It is understood that the specific arrangement of the first surface 512 and the second surface 61 is not limited. For example, the first surface 512 and the second surface 61 are arranged at intervals, and the first reinforcing member 6 and the protective cover 51 can be arranged at intervals.

[0145] In some embodiments, please refer to Figure 5 The recessed direction of the second surface 61 is opposite to that of the electrode assembly 2.

[0146] For example, the second surface 61 can be a recessed arc surface.

[0147] For example, the second surface 61 includes a plurality of sub-planes, with adjacent sub-planes arranged intersecting each other so that the recessed direction of the second surface 61 is opposite to that of the electrode assembly 2.

[0148] In this embodiment, the recessed direction of the second surface 61 is away from the electrode assembly 2, so that the preset distance corresponding to the position of the second surface 61 near the protective cover 51 varies greatly, which is beneficial for the first reinforcing member 6 to better avoid the electrode tab and other structures that are electrically connected to the electrode terminal 3.

[0149] It is understood that the specific shape of the second surface 61 is not limited. For example, the second surface 61 can be a plane. For example, the second surface 61 can be an inclined plane.

[0150] In some embodiments, please refer to Figures 3-5 The battery cell 500 also includes an electrode terminal 3 electrically connected to the electrode assembly 2. The electrode terminal 3 passes through the end cover 12 and the insulating member 5. The electrode terminal 3 and the pressure relief mechanism 4 are arranged at intervals. The protective cover 51 is provided with first reinforcing members 6 on both sides of the opposite sides along the arrangement direction of the electrode terminal 3 and the pressure relief mechanism 4.

[0151] For example, please refer to Figures 3-5 The direction indicated by arrow R2 in the figure is the arrangement direction of electrode terminal 3 and pressure relief mechanism 4.

[0152] Electrode terminals 3, which are electrically connected to the tabs of electrode assembly 2, pass through end cover 12 and insulating member 5, and extend to the outside of end cover 12. Electrode terminals 3 are arranged on end cover 12.

[0153] For example, please refer to Figures 3-5 Electrode terminals 3 are provided on both sides of the protective cover 51, and the arrangement direction of the electrode terminals 3 on both sides is intersected with the preset direction.

[0154] For example, please refer to Figures 3-5 The direction indicated by arrow R2 in the figure is the arrangement direction of the electrode terminals on both sides.

[0155] For example, please refer to Figure 5 The insulating component 5 has a mounting hole 53, and the electrode terminal 3 passes through the mounting hole 53.

[0156] In this embodiment, the electrode terminal 3 and the pressure relief mechanism 4 are arranged at intervals. The space between the electrode terminal 3 and the pressure relief mechanism 4 can be used to arrange the first reinforcing member 6. The protective cover 51 is provided with the first reinforcing member 6 on both sides of the opposite side along the arrangement direction of the electrode terminal 3 and the pressure relief mechanism 4, so that the opposite sides of the protective cover 51 can be strengthened to a certain extent, which is beneficial to improve the strength of the insulating member 5 near the protective cover 51 and reduce the degree of warping of the insulating member 5 near the protective cover 51.

[0157] It is understood that the arrangement of the first reinforcing member 6 is not limited. Exemplarily, the first reinforcing member 6 is located on one side of the protective cover 51 along the arrangement direction of the electrode terminals 3 and the pressure relief mechanism 4.

[0158] It is understood that the specific arrangement of the electrode terminals 3 is not limited. For example, the electrode terminals 3 can be mounted on the housing 11.

[0159] In some embodiments, please refer to Figure 5 The first reinforcing member 6 and the insulating member 5 are integrally formed.

[0160] For example, the insulating member 5 is made of lower plastic, and the first reinforcing member 6 is made of the same material as the lower plastic.

[0161] In this embodiment, the first reinforcing member 6 and the insulating member 5 are integrally formed, which improves the overall integrity of the insulating member 5 and the first reinforcing member 6 that reinforces the insulating member 5, thereby enhancing the strength of the insulating member 5. The integral forming of the first reinforcing member 6 and the insulating member 5 reduces the number of parts and simplifies the assembly of the battery cell 500.

[0162] It is understood that the specific structures of the first reinforcing member 6 and the insulating member 5 are not limited. For example, the materials of the first reinforcing member 6 and the insulating member 5 can be the same or different. The first reinforcing member 6 and the insulating member 5 are manufactured independently and then the first reinforcing member 6 is assembled to the insulating member 5.

[0163] In some embodiments, please refer to the figure, the first reinforcement 6 is connected to the protective cover 51.

[0164] In this embodiment, the first reinforcing member 6 is connected to the protective cover 51, so that the protective cover 51 can be constrained by the first reinforcing member 6, which is beneficial to improve the strength of the protective cover 51 and reduce the degree of warping of the insulating member 5 near the protective cover 51.

[0165] In some embodiments, please refer to Figure 4 and Figure 5 The battery cell 500 also includes a second reinforcing member 7 connected to the side of the insulating member 5 facing the end cover 12. The second reinforcing member 7 is strip-shaped and along a preset direction. The projection area of ​​the second reinforcing member 7 is located outside the projection area of ​​the protective cover 51.

[0166] For example, the strip-shaped second reinforcing member 7 extends in a straight line.

[0167] For example, the strip-shaped second reinforcing member 7 extends in a curve.

[0168] For example, the strip-shaped second reinforcing member 7 extends in a spiral shape.

[0169] For example, at least two second reinforcing members 7 are arranged crosswise.

[0170] For example, along a preset direction, the projection area of ​​the second reinforcing member 7 is located outside the projection area of ​​the buffer cavity 511.

[0171] In this embodiment, a strip-shaped second reinforcing member 7 is provided on the side of the insulating member 5 facing the end cover 12, and the projection area of ​​the second reinforcing member 7 is located outside the projection area of ​​the protective cover 51. This allows the second reinforcing member 7 to strengthen the area of ​​the insulating member 5 outside the protective cover 51, thereby increasing the strength of the insulating member 5 outside the protective cover 51 and reducing the degree of warping of the insulating member 5 outside the protective cover 51.

[0172] It is understood that the specific structure of the battery cell 500 is not limited. For example, the battery cell 500 may not have the second reinforcing member 7.

[0173] In some embodiments, please refer to Figure 4 and Figure 5 The insulating member 5 has a hot-riveting post 52 formed on the side facing the end cover 12, which is riveted to the end cover 12, and the second reinforcing member 7 is connected to the hot-riveting post 52.

[0174] After being heated and deformed, the hot riveting post 52 is riveted to the riveting hole on the end cap 12. For example, the riveting hole on the end cap 12 can be a blind hole.

[0175] For example, along a preset direction, the projection area of ​​the hot riveting post 52 is located outside the projection area of ​​the buffer cavity 511.

[0176] In this embodiment, the hot riveting post 52 is connected to the end cap 12, and the second reinforcing member 7 is connected to the hot riveting post 52. To a certain extent, the insulating member 5 is constrained by the end cap 12 at the position corresponding to the hot riveting post 52, which can reduce the warping of the insulating member 5 at the position corresponding to the hot riveting post 52. The second reinforcing member 7 connected to the hot riveting post 52 is traction-constrained by the hot riveting post 52, which can reduce the warping of the insulating member 5 at the position where the second reinforcing member 7 is located.

[0177] It is understood that the specific structure of the insulating member 5 is not limited. Exemplarily, the insulating member 5 may not have the hot-riveting post 52. Exemplarily, the second reinforcing member 7 is arranged at an interval from the hot-riveting post 52.

[0178] In some embodiments, please refer to Figure 4 and Figure 5 The two ends of the second reinforcing member 7 are respectively connected to the corresponding hot riveting post 52.

[0179] For example, the number of second reinforcing members 7 is at least two, and in the at least two second reinforcing members 7, each of the two ends of the second reinforcing member 7 is connected to the corresponding hot riveting post 52.

[0180] For example, please refer to Figure 4 and Figure 5 Both second reinforcing members 7 are arranged in a straight line, and the two second reinforcing members 7 are arranged in a cross shape. In the two second reinforcing members 7, each of the two ends of the second reinforcing member 7 is connected to the corresponding hot riveting post 52.

[0181] In at least two second reinforcing members 7, each second reinforcing member 7 has its two ends connected to a corresponding hot-riveting post 52. For example, if there are four second reinforcing members 7, in two of them, each second reinforcing member 7 has its two ends connected to a corresponding hot-riveting post 52, while the arrangement of the other two second reinforcing members 7 and the hot-riveting post 52 is not limited. The other two second reinforcing members 7 can be arranged with one end of each second reinforcing member 7 spaced apart from the hot-riveting post 52; that is, it is not necessary for both ends of each of the other two second reinforcing members 7 to be connected to the hot-riveting post 52. For example, if there are four second reinforcing members 7, each second reinforcing member 7 has both ends connected to the hot-riveting post 52.

[0182] In this embodiment, the two ends of the second reinforcing member 7 are respectively connected to the corresponding hot riveting post 52. The two ends of the second reinforcing member 7 are constrained by the hot riveting post 52, which helps to improve the strength of the insulating member 5 and reduce the degree of warping of the insulating member 5 at the second reinforcing member 7.

[0183] It is understood that the specific manner in which the second reinforcing member 7 is connected to the hot riveting post 52 is not limited. For example, in all the second reinforcing members 7, one end of each second reinforcing member 7 is connected to the hot riveting post 52, and the corresponding other end is arranged at intervals with the hot riveting post 52.

[0184] In some embodiments, please refer to Figure 4 and Figure 5 The end cap 12 is provided with a groove, and the second reinforcing member 7 is partially located in the groove of the end cap 12. The second reinforcing member 7 is connected to the end cap 12.

[0185] For example, the second reinforcing member 7 is embedded in a corresponding groove of the end cap 12, and the portion of the second reinforcing member 7 embedded in the groove is interference-fitted with the end cap 12.

[0186] In this embodiment, the second reinforcing member 7 is connected to the end cap 12. The end cap 12 constrains the second reinforcing member 7, which helps to improve the strength of the insulating member 5 at the location of the second reinforcing member 7 and reduce the degree of warping of the insulating member 5 at the location of the second reinforcing member 7.

[0187] It is understood that the specific arrangement of the second reinforcing member 7 and the end cap 12 is not limited. Exemplarily, the second reinforcing member 7 abuts against the end cap 12, but the second reinforcing member 7 is not connected to the end cap 12, and the end cap 12 does not restrict the second reinforcing member 7 from moving or deforming toward the electrode assembly 2. Exemplarily, the second reinforcing member 7 may be arranged at a distance from the end cap 12.

[0188] In some embodiments, please refer to Figure 4 and Figure 5 The battery cell 500 has an injection hole 8 that communicates with the space formed by the housing 11 and the end cap 12. The injection hole 8 penetrates the end cap 12 and the insulating member 5. At least two second reinforcing members 7 are relief ribs. The at least two relief ribs are arranged circumferentially along the injection hole 8 and are offset from the injection hole 8.

[0189] For example, the clearance rib is located on the side of the protective cover 51 facing the injection hole 8.

[0190] For example, the number of clearance ribs can be four, and the four clearance ribs are arranged sequentially along the circumference of the injection hole 8 so that at least two clearance ribs are arranged along the circumference of the injection hole 8.

[0191] For example, the number of clearance ribs can be four, and the four clearance ribs are arranged sequentially at intervals along the circumference of the injection hole 8 so that at least two clearance ribs are arranged along the circumference of the injection hole 8.

[0192] For example, there may be two relief ribs, each relief rib is generally U-shaped, each relief rib extends at least partially along the circumference of the injection hole 8, and the two relief ribs are arranged to form two intersection positions.

[0193] The avoidance rib is offset from the injection hole 8, that is, along the preset direction, the projection area of ​​the avoidance rib is located outside the projection area of ​​the injection hole 8.

[0194] In this embodiment, since the relief ribs are staggered from the injection hole 8, the arrangement of the relief ribs does not affect the injection of liquid into the injection hole 8. At least two relief ribs are arranged circumferentially along the injection hole 8, which can improve the strength of the insulating member 5 in the vicinity of the injection hole 8 to a certain extent, reducing the possibility of the insulating member 5 warping near the injection hole 8.

[0195] It is understood that the arrangement of the clearance ribs is not limited. For example, the clearance ribs may be located between the protective cover 51 and the injection hole 8, or the clearance ribs may be located on the side of the injection hole 8 away from the protective cover 51.

[0196] In some embodiments, please refer to Figure 4 and Figure 5 At least two clearance ribs are arranged sequentially along the circumference of the injection hole 8.

[0197] In the embodiments of this application, the shape of the avoidance rib is simple and easy to manufacture.

[0198] In some embodiments, please refer to Figure 4 and Figure 5 Each clearance rib extends at least partially along the circumference of the injection hole 8, and two clearance ribs are arranged intersectingly to form two intersection positions.

[0199] In this embodiment, the avoidance rib extends at least partially along the circumference of the injection hole 8. The portion of the avoidance rib extending along the circumference of the injection hole 8 can strengthen the position near the injection hole 8 along the circumference of the injection hole 8. The avoidance ribs intersect to form two intersection positions, which is beneficial to further strengthen the strength of the insulating component near the injection hole and reduce the degree of warping of the insulating component 5 near the injection hole.

[0200] In some embodiments, please refer to Figure 4 and Figure 5 The battery cell 500 has an injection hole 8 that communicates with the space formed by the housing 11 and the end cap 12. The injection hole 8 penetrates the end cap 12 and the insulating member 5. At least two second reinforcing members 7 located on the side of the protective cover 51 opposite to the injection hole 8 are arranged crosswise to form an intersection position.

[0201] For example, each of the second reinforcing members 7 located on the side of the protective cover 51 away from the injection hole 8 extends in a straight line, and at least two of the second reinforcing members 7 located on the side of the protective cover 51 away from the injection hole 8 are arranged in an intersecting manner, and at least two of the second reinforcing members 7 located on the side of the protective cover 51 away from the injection hole 8 intersect at an intersecting position.

[0202] In this embodiment, at least two second reinforcing members 7 located on the side of the protective cover 51 opposite to the injection hole 8 are arranged crosswise to form an intersection. The insulating member 5 has high strength at the corresponding intersection, reducing the possibility of the insulating member 5 warping at the corresponding intersection. The crosswise arrangement of at least two second reinforcing members 7 on the side of the protective cover 51 opposite to the injection hole 8 results in a simple structure that does not need to avoid the injection hole 8, making it convenient to manufacture.

[0203] It is understood that the arrangement of the at least two second reinforcing members 7 on the side of the protective cover 51 opposite to the injection hole 8 is not limited. For example, the at least two second reinforcing members 7 on the side of the protective cover 51 opposite to the injection hole 8 may not intersect, and the at least two second reinforcing members 7 on the side of the protective cover 51 opposite to the injection hole 8 may be arranged at intervals or in parallel.

[0204] In some embodiments, please refer to Figure 5 The second reinforcing member 7 and the insulating member 5 are integrally formed.

[0205] For example, the insulating member 5 is a lower plastic, and the second reinforcing member 7 is integrally molded with the lower plastic.

[0206] In this embodiment, the second reinforcing member 7 and the insulating member 5 are integrally formed, resulting in better overall structural integrity and improving the strength of the insulating member 5. The integral forming of the second reinforcing member 7 and the insulating member 5 reduces the number of components and simplifies the assembly of the battery cell 500.

[0207] It is understood that the connection method between the second reinforcing member 7 and the insulating member 5 is not limited. For example, the materials of the second reinforcing member 7 and the insulating member 5 can be the same or different. The second reinforcing member 7 and the insulating member 5 can be manufactured independently, and then the second reinforcing member 7 can be assembled to the insulating member 5.

[0208] In some embodiments, please refer to Figure 5 The second reinforcing member 7 is located on the side of the first reinforcing member 6 away from the protective cover 51 along the arrangement direction of the protective cover 51 and the first reinforcing member 6. The projection area of ​​the second reinforcing member 7 along the preset direction is the first projection area, the projection area of ​​the first reinforcing member 6 along the preset direction is the second projection area, and the projection area of ​​the protective cover 51 along the preset direction is the third projection area. The first projection area is partially located outside the side of the second projection area away from the third projection area.

[0209] It should be explained that the protective cover 51 and the first reinforcing member 6 are arranged in a cross direction with the preset direction.

[0210] For example, please refer to Figures 3-5 The direction indicated by arrow R2 in the figure is the arrangement direction of the protective cover 51 and the first reinforcing member 6.

[0211] The first projection area is partially located outside the second projection area on the side away from the third projection area, and the portion of the first projection area outside the second projection area is located on the side of the second projection area away from the third projection area.

[0212] For example, electrode terminals 3 are provided on both opposite sides of the protective cover 51, and the protective cover 51 and the first reinforcing member 6 are arranged along the arrangement direction of the electrode terminals 3 on both sides. A first reinforcing member 6 and a second reinforcing member 7 are provided on both opposite sides of the protective cover 51, with each first reinforcing member 6 and the second reinforcing member 7 located between the protective cover 51 and the corresponding electrode terminal 3 along the arrangement direction of the electrode terminals 3 on both sides. Each second reinforcing member 7 is at least partially located between the first reinforcing member 6 and the corresponding electrode terminal 3 along the arrangement direction of the electrode terminals 3 on both sides.

[0213] In this embodiment, the second reinforcing member 7 is at least partially located on the side of the first reinforcing member 6 away from the protective cover 51 along the arrangement direction of the protective cover 51 and the first reinforcing member 6. When the first reinforcing member 6 can better avoid the structure of the electrode assembly 2 and the electrode terminal 3 that is electrically connected, the second reinforcing member 7 strengthens the part of the insulating member 5 on the side of the first reinforcing member 6 away from the protective cover 51, which is beneficial to reduce the degree of warping of the insulating member 5 near the side of the first reinforcing member 6 away from the protective cover 51.

[0214] It is understood that the specific position of the second reinforcing member 7 relative to the first reinforcing member 6 is not limited. For example, the projection area of ​​the second reinforcing member 7 along a preset direction can be entirely located within the projection area of ​​the first reinforcing member 6 along the preset direction.

[0215] In some embodiments, please refer to Figures 3-5The battery cell 500 includes a housing 1, an electrode assembly 2, electrode terminals 3, a pressure relief mechanism 4, an insulating member 5, and a first reinforcing member 6. The housing 1 includes a shell 11 and an end cap 12, with the end cap 12 covering the shell 11. The electrode assembly 2 is located within the space enclosed by the shell 11 and the end cap 12, and the electrode assembly 2 has tabs. The electrode assembly 2 and the end cap 12 are arranged in a predetermined direction. The electrode terminals 3 are electrically connected to the tabs and are mounted on the housing 1. The pressure relief mechanism 4 is mounted on the end cap 12. The insulating member 5 is located between the end cap 12 and the electrode assembly 2. The insulating member 5 has a protective cover 51, which protrudes from the side of the insulating member 5 facing the electrode assembly 2. The side of the protective cover 51 facing the pressure relief mechanism 4 has a buffer cavity 511. The surface of the protective cover 51 facing the electrode assembly 2 is a first surface 512. Along the predetermined direction, the projection area of ​​the pressure relief mechanism 4 and the projection area of ​​the buffer cavity 511 at least partially overlap. The first reinforcing member 6 is connected to the side of the insulating member 5 facing the electrode assembly 2. The first reinforcing member 6 is located on the side of the first surface 512 facing away from the electrode assembly 2 along a preset direction. Along the preset direction, the projection area of ​​the first reinforcing member 6 is at least partially outside the projection area of ​​the protective cover 51. The insulating member 5 is made of polypropylene. The surface of the first reinforcing member 6 facing the electrode assembly 2 is the second surface 61. The distance between the first surface 512 and the second surface 61 along the preset direction is a preset distance, which gradually decreases from the end of the second surface 61 near the protective cover 51 to the end of the second surface 61 away from the protective cover 51. The concave direction of the second surface 61 is away from the electrode assembly 2, and the shape of the second surface 61 is a concave arc shape. The battery cell 500 has a liquid injection hole 8 communicating with the space enclosed by the housing 11 and the end cap 12. The liquid injection hole 8 penetrates the end cap 12 and the insulating member 5. At least two second reinforcing members 7 located on the side of the protective cover 51 facing away from the liquid injection hole 8 are arranged crosswise to form an intersection position. The two second reinforcing members 7 intersect in an X-shaped structure. At least two second reinforcing members 7 are located on the side of the protective cover 51 opposite to the injection hole 8, with each second reinforcing member 7 having its two ends connected to a corresponding hot-riveting post 52. Both the second reinforcing member 7 and the hot-riveting post 52 are connected to the end cap 12, increasing the connection area between the overall structure formed by the insulating member 5 and the second reinforcing member 7 and the end cap 12, strengthening the connection strength between the overall structure formed by the second reinforcing member 7 and the insulating member 5 and the end cap 12, which is beneficial for the end cap 12 to better constrain the overall structure formed by the second reinforcing member 7 and the insulating member 5. The second reinforcing member 7 can be riveted to the end cap 12. The connection between the first reinforcing member 6 and the protective cover 51 can improve the tensile strength of the overall insulating member 5. The end cap 12 can be made of aluminum. The insulating member 5 is partially clamped between the electrode terminal 3 and the end cap 12.

[0216] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This 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 battery monomer comprises: a shell comprising a shell body and an end cover, the end cover covering the shell body; an electrode assembly located in a space enclosed by the shell body and the end cover, the arrangement direction of the electrode assembly and the end cover being a preset direction; a pressure relief mechanism mounted on the end cover; an insulating piece located between the end cover and the electrode assembly, the insulating piece having a protective cover protruding from one side of the insulating piece facing the electrode assembly, the surface of the one side of the protective cover facing the electrode assembly being a first surface, and the projection area of the pressure relief mechanism and the projection area of the protective cover at least partially overlapping in the preset direction; a first reinforcing piece connected to one side of the insulating piece facing the electrode assembly, the first reinforcing piece being located on the side of the first surface away from the electrode assembly in the preset direction, and the projection area of the first reinforcing piece at least partially being located outside the projection area of the protective cover in the preset direction.

2. The battery cell of claim 1, wherein, The first reinforcing piece is connected to the protective cover.

3. The battery cell of claim 2, wherein, The surface of one side of the first reinforcing piece facing the electrode assembly is a second surface, and the first surface and the second surface are connected.

4. The battery cell of claim 3, wherein, The distance between the first surface and the second surface in the preset direction is a preset distance, which gradually decreases from one end of the second surface close to the protective cover to the other end of the second surface away from the protective cover.

5. The battery cell of claim 4, wherein, The recess direction of the second surface is away from the electrode assembly.

6. The battery cell of claim 1, wherein, The battery monomer further comprises an electrode terminal electrically connected to the electrode assembly, the electrode terminal penetrating the end cover and the insulating piece, the electrode terminal being arranged apart from the pressure relief mechanism, and the protective cover being provided with the first reinforcing piece on the opposite sides of the electrode terminal and the pressure relief mechanism in the arrangement direction.

7. The battery cell of claim 1, wherein, The first reinforcing piece and the insulating piece are integrally formed.

8. The battery cell according to any one of claims 1 to 7, characterized in that The battery monomer further comprises a second reinforcing piece connected to one side of the insulating piece facing the end cover, the second reinforcing piece being in the shape of a strip, and the projection area of the second reinforcing piece being located outside the projection area of the protective cover in the preset direction.

9. The battery cell of claim 8, wherein, One side of the insulating piece facing the end cover is formed with a hot riveting column riveted to the end cover, and the second reinforcing piece is connected to the hot riveting column.

10. The battery cell of claim 9, wherein, The two ends of the second reinforcing piece are respectively connected to the corresponding hot riveting columns.

11. The battery cell of claim 8, wherein, The end cover is provided with a groove, and the second reinforcing piece is partially located in the groove of the end cover, and the second reinforcing piece is connected to the end cover.

12. The battery cell of claim 8, wherein, The battery monomer has a liquid injection hole communicating with the space enclosed by the shell body and the end cover, the liquid injection hole penetrating the end cover and the insulating piece, and at least two second reinforcing pieces being avoidance ribs, the avoidance ribs being arranged along the circumference of the liquid injection hole, and the avoidance ribs being staggered with the liquid injection hole.

13. The battery cell of claim 12, wherein, The at least two avoidance ribs are sequentially arranged along the circumference of the liquid injection hole; or, each avoidance rib at least partially extends along the circumference of the liquid injection hole, and two avoidance ribs are arranged in cross to form two cross positions.

14. The battery cell of claim 8, wherein, The battery cell has a liquid injection hole in communication with a space surrounded by the casing and the end cover, the liquid injection hole penetrating through the end cover and the insulating member, and at least two second reinforcing members located on a side of the protective cover away from the liquid injection hole are arranged in a cross manner to form a cross position.

15. The battery cell of claim 8, wherein, The second reinforcing member is integrally formed with the insulating member.

16. A battery device characterized by comprising: A battery cell according to any one of claims 1 to 15 is used for storing or providing electric energy.

17. An electrical device, comprising: A battery device according to claim 16 or a battery cell according to any one of claims 1 to 15 is used for storing or providing electric energy.

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