Battery cell, battery device, and electric device

Abstract

The application relates to the battery technical field and provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell with a containing cavity for storing electrolyte, the containing cavity has an opening; an electrode assembly is contained in the containing cavity; a top cover assembly comprises a top cover plate and an insulating piece, the top cover plate covers the opening, the top cover plate is provided with a liquid injection hole, and the insulating piece is located between the electrode assembly and the top cover plate; the insulating piece comprises an insulating body and a liquid spray prevention assembly arranged on the insulating body, the insulating body is provided with a through hole, the through hole is in position correspondence with the liquid injection hole and is in mutual communication, and the liquid spray prevention assembly is at least partially shielded on the through hole and is used for limiting the electrolyte in the shell from being sprayed outward. Through the technical scheme, the risk of electrolyte spraying outward of the battery in the formation stage can be reduced, the loss of the electrolyte is reduced, and the cycle service life of the battery monomer is improved.

Description

Technical Field

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

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] Currently, battery devices are widely used in various consumer electronics products and electric vehicles due to their outstanding characteristics such as light weight, no pollution, and no memory effect.

[0004] However, as the application range of battery devices becomes wider, the requirements for battery device performance are also becoming higher. Among them, battery devices typically have one or more battery cells. During the formation stage of the battery cell, the electrolyte and additives inside the cell will undergo oxidative decomposition, resulting in a large amount of gas generation during formation, and liquid spraying, which leads to electrolyte loss and ultimately affects the cycle life of the battery cell. Summary of the Invention

[0005] The purpose of this application is to provide a battery cell, a battery device, and an electrical device to improve the electrolyte spraying situation inside the battery cell during formation and to increase the cycle life of the battery cell. This purpose is achieved through the following technical solution:

[0006] In a first aspect, this application provides a battery cell, comprising: a housing having a cavity for storing electrolyte, the cavity having an opening; an electrode assembly housed within the cavity; and a top cover assembly including a top cover plate and an insulating member, the top cover plate sealing the opening and having an injection hole, the insulating member being located between the electrode assembly and the top cover plate, wherein the insulating member includes an insulating body and an anti-spraying component disposed on the insulating body, the insulating body having a through hole corresponding to and communicating with the injection hole, and the anti-spraying component at least partially blocking the through hole to restrict the electrolyte in the housing from spraying outward.

[0007] According to the battery cell provided in this application, by setting an anti-spray assembly on the insulating body of the insulating component and setting the anti-spray assembly corresponding to the through hole, when the electrolyte and additives inside the casing generate gas during oxidation and decomposition, the anti-spray assembly can play a blocking role, thereby reducing the risk of electrolyte being sprayed out from the through hole and injection hole with the gas, thus reducing electrolyte loss and helping to improve the cycle life of the battery cell.

[0008] In addition, the battery cell provided in this application may also have the following additional technical features:

[0009] In some embodiments of this application, the anti-spray assembly includes an anti-spray panel and a plurality of first baffles connected to the periphery of the anti-spray panel. The anti-spray panel covers the through hole. The plurality of first baffles are disposed on the side of the insulating body away from the top cover plate and are connected to the circumferential edge of the through hole. An inlet is defined between adjacent first baffles. The inlet is configured to allow the electrolyte injected by the injection hole to flow into the receiving cavity.

[0010] In the above technical solution, multiple first baffles are spaced apart and connected to the periphery of the blow-out preventer panel, and connected to the circumferential edge of the through hole. This allows the blow-out preventer panel to block the through hole, thus preventing the electrolyte from being ejected upwards from the through hole and injection hole when the electrolyte and additives inside the casing undergo oxidation and decomposition to generate gas. Furthermore, since an inlet is defined between two adjacent first baffles, when electrolyte is injected into the housing cavity through the injection hole, the electrolyte can flow from the injection hole into the side of the blow-out preventer panel away from the electrode assembly, and finally flow into the housing cavity from the inlet. This allows for electrolyte injection into individual battery cells. The structure and principle are relatively simple and easy to implement.

[0011] In some embodiments of this application, along the direction from the top cover to the insulating member, the projection of the injection hole on the blowout preventer assembly is located within the blowout preventer assembly.

[0012] In the above technical solution, the size of the injection hole is smaller than the outer contour size of the anti-spray component, which can further reduce the risk of electrolyte spraying upward from the through hole.

[0013] In some embodiments of this application, the anti-spray panel includes an arc-shaped panel, wherein the side of the arc-shaped panel facing the electrode assembly is concave, and the side of the arc-shaped panel away from the electrode assembly is convex.

[0014] In the above technical solution, by setting the concave surface of the arc-shaped panel towards the electrode assembly and the convex surface towards the top cover plate, the concave surface can effectively reduce electrolyte spraying outwards and facilitate electrolyte return to the receiving cavity during electrolyte injection. Conversely, setting the convex surface towards the injection hole allows it to act as a buffer during electrolyte injection, reducing the risk of structural misalignment caused by direct impact of electrolyte on the electrode assembly inside the housing. It also guides the electrolyte flow, allowing it to quickly fall from around the panel and flow into the receiving cavity through the inlet, thus improving injection efficiency.

[0015] In some embodiments of this application, the convex portion protrudes into the through hole, and along the direction from the insulating member to the top cover plate, the convex portion does not exceed the side surface of the insulating body facing the top cover plate.

[0016] In the above technical solution, the convex portion extends into the through hole, so when the electrolyte enters the through hole from the injection hole, the convex surface can act as a buffer to reduce the flow rate of the electrolyte when entering the receiving cavity. Furthermore, the convex surface does not exceed the surface of the insulating body facing the top cover, thereby reducing the space occupied by the anti-spray panel and facilitating the installation of the top cover and insulating components, thus improving the product's assembly efficiency.

[0017] In some embodiments of this application, the anti-spray assembly further includes a plurality of support members, with one support member connected between two adjacent first baffles. The support member forms the liquid inlet between the anti-spray panel and the two adjacent first baffles. The end of the support member facing the top cover is fixedly connected to the insulating body, thereby defining a flow guiding gap between the first baffle and the insulating body.

[0018] In the above technical solution, the support member is connected between two adjacent first baffles, and the end of each support member facing the top cover plate is fixedly connected to the insulating body, so that a flow guiding gap can be defined between the surface of the first baffle and the insulating body, so that when the electrolyte is injected, the electrolyte can flow along the convex surface to the side surface of the first baffle facing the top cover plate, and flow into the receiving cavity of the shell through the liquid inlet.

[0019] In some embodiments of this application, the anti-spray assembly further includes a plurality of second baffles, which are correspondingly connected to the side of the plurality of first baffles away from the anti-spray panel, and each second baffle is provided with a liquid inlet hole for allowing the electrolyte injected by the injection hole to flow into the receiving cavity.

[0020] In the above technical solution, the second baffle is connected to the side of the first baffle away from the anti-spray panel, so that during liquid injection, the electrolyte can flow along the convex surface to the first baffle and the second baffle in sequence, and can fall into the housing cavity from the liquid inlet hole on the second baffle, thereby further improving the liquid injection efficiency.

[0021] In some embodiments of this application, each of the second baffles is provided with a plurality of liquid inlet holes, and the plurality of liquid inlet holes are arranged at circumferential intervals along the through hole.

[0022] In the above technical solution, the number of liquid inlet holes on the second baffle is increased, which can not only further improve the main efficiency, but also improve the uniformity of electrolyte entering the containment cavity by the liquid inlet holes being spaced apart along the circumferential direction of the through hole on the second baffle, and further reduce the risk of structural misalignment caused by electrolyte impacting the electrode assembly.

[0023] In some embodiments of this application, the anti-spray assembly is integrally formed with the insulating body.

[0024] In the above technical solution, the anti-spray component and the insulating body are manufactured using an integrated molding process, which can improve the assembly efficiency of the product and reduce the number of parts required to connect the anti-spray component and the insulating plate, thereby reducing the production cost of the product.

[0025] In some embodiments of this application, the electrode assembly includes a positive electrode sheet, the positive electrode sheet includes a positive current collector and a positive electrode film layer disposed on at least one side surface of the positive current collector, the positive electrode film layer includes a positive electrode active material and an additive, the additive includes a first organic compound, the first organic compound includes a first functional group, the first functional group includes at least one of primary amine, secondary amine, tertiary amine, quaternary amine, nitrogen-nitrogen double bond, carbon-nitrogen double bond, and carbon-carbon double bond.

[0026] In the above technical solutions, the functional groups in this application refer to the replacement of hydrogen or carbon atoms in organic matter with other atoms or groups of atoms that can determine the chemical properties of organic matter. The functional groups listed in this application are easily oxidized into other stable functional groups during battery cycling. These stable functional groups can stably adhere to the surface of the positive electrode active material, reducing side reactions between the positive electrode active material and the electrolyte, thereby improving the battery's cycle life.

[0027] In some embodiments of this application, at least a portion of the surface of the positive electrode active material is formed with a solid electrolyte interface film; the solid electrolyte interface film contains a second organic compound, the second organic compound including a second functional group; the second functional group includes at least one selected from nitro, amide, imide, and carboxylic acid.

[0028] In the above technical solution, the solid electrolyte interface film of this application refers to the passivation layer formed on the surface of the positive electrode active material. It is usually formed during the first charge and discharge process of the battery. The solid electrolyte interface film has the characteristics of a solid electrolyte. It is an electronic insulator but a good conductor for metal ions. It can also effectively prevent the co-intercalation of solvent molecules in the electrolyte, avoid damage to the positive electrode active material, and thus improve the cycle life of the battery.

[0029] The first functional group listed above is described in this application. Among them, the primary amino group, secondary amino group, tertiary amino group, quaternary amino group, nitrogen-nitrogen double bond, carbon-nitrogen double bond, carbon-carbon double bond, etc. in the first functional group are oxidized to form nitro group during the first charge and discharge of the battery. The carbon-nitrogen double bond and carbon-carbon double bond are also easily oxidized to form carboxyl group. The carboxyl group reacts with the unoxidized amino group to form amide or imide. Any one or more of the listed nitro group, amide, and imide can be stably formed on the surface of the positive electrode active material.

[0030] Secondly, this application provides a battery device including one or more battery cells as described in the first aspect of the embodiment.

[0031] The battery device provided according to this application includes the battery cell described in any one of the first aspect embodiments, and therefore also has the technical effects of any of the above embodiments, which will not be repeated here.

[0032] Thirdly, this application provides an electrical device including a battery device as described in the second aspect embodiment, the battery device being used to supply power to the electrical device.

[0033] The electrical device provided in this application includes the battery device described in the second aspect embodiment, and therefore also has the technical effects of any of the above embodiments, which will not be repeated here. Attached Figure Description

[0034] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. 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:

[0035] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0036] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0037] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0038] Figure 4 A schematic diagram of the structure of an insulating element provided in some embodiments of this application from one perspective;

[0039] Figure 5 This is a schematic diagram of the structure of an insulating element provided in some embodiments of this application from another perspective;

[0040] Figure 6 for Figure 5 Enlarged structural diagram of section A in the middle;

[0041] Figure 7 A schematic diagram of the structure of a spray preventer assembly provided in some embodiments of this application;

[0042] Figure 8 A schematic structural diagram from one perspective of another anti-spray assembly provided in some embodiments of this application;

[0043] Figure 9 for Figure 8 A schematic diagram of the anti-spray assembly from another perspective.

[0044] The attached figures are labeled as follows:

[0045] 1000, vehicles;

[0046] 100. Battery assembly; 200. Controller; 300. Motor;

[0047] 10. Battery box; 11. First box body; 12. Second box body; 20. Battery cell; 21. Housing; 211. Receiving cavity; 22. Electrode assembly; 221. Electrode tab; 23. Top cover assembly; 231. Top cover plate; 232. Insulating component; 2311. Electrode terminal; 2312. Pressure relief mechanism;

[0048] 2321, Insulating body; 23211, Through hole; 2322, Blowout preventer assembly; 2323, First recessed platform; 2324, Second recessed platform; 2325, Explosion-proof recessed platform; 2326, Pressure relief hole; 23221, Blowout preventer panel; 23222, First baffle; 23223, Second baffle; 23224, Support member; 23225, Liquid inlet; 23226, Liquid inlet hole. Detailed Implementation

[0050] 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.

[0051] 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.

[0052] In the description of the embodiments of this application, technical terms such as "first" and "second" 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.

[0053] 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.

[0054] 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 have an "or" relationship.

[0055] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0056] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0058] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0059] However, as the application range of battery devices becomes wider, the requirements for their performance are also increasing. Battery devices typically consist of one or more individual cells. During the formation stage, the electrolyte and additives inside these cells undergo oxidative decomposition, leading to significant gas production and electrolyte spraying, ultimately affecting the cycle life of the individual cells.

[0060] To address the issue of electrolyte splashing during the formation stage of current battery cells, this application designs a battery cell with a through-hole on the insulating component of the top cover assembly that corresponds to and is connected to the electrolyte injection hole. An anti-spray component is then installed at the corresponding position of the through-hole to block it. During the formation stage, the electrolyte and additives inside the battery cell undergo oxidative decomposition, generating a significant amount of gas. As the electrolyte rises with the gas, the anti-spray component prevents further upward spray of electrolyte when it splashes onto the insulating component. This reduces the risk of electrolyte spilling out from the through-hole and injection hole, minimizing electrolyte loss and contributing to improved cycle life of the battery cell.

[0061] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system comprising the battery cells and battery devices disclosed in this application can be used to construct such an electrical device. This helps to reduce the risk of electrolyte splashing outwards from the battery cells, decreases electrolyte loss, and increases the cycle life of the battery cells.

[0062] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0063] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 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, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0064] 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.

[0065] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies 20 for providing voltage and capacity. A battery cell assembly 20 may include multiple battery cells 20, which are connected in series, parallel, or mixed connections via busbars.

[0066] In some embodiments, the battery cell assembly is typically formed by arranging multiple battery cells 20.

[0067] As an example, the battery cell 20 assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 20 together to form an independent module. As an example, a battery module can be formed by bundling multiple battery cells 20 together with cable ties.

[0068] In some embodiments, the battery device may be a battery pack, which includes a battery case 10 and one or more battery cells 20 assemblies housed in the battery case 10.

[0069] As an example, the battery cell 20 assembly can be housed in the battery case 10 by fixing the battery module in the battery case 10.

[0070] As an example, the battery cell 20 assembly can also be housed in the battery box 10 by directly fixing multiple battery cells 20 to the battery box 10.

[0071] As an example, the battery box 10 may include a first box 11 and a second box 12. The first box 11 and the second box 12 are fastened together to form a closed space inside the battery box 10 to house the battery cells 20 assembly. Here, "closed" refers to covering or closing, and can be sealed or unsealed. The first box 11 may be a top cover or a bottom plate.

[0072] As an example, the battery box 10 may 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 the interior of the battery box 10 forms an enclosed space to accommodate the battery cells 20 assembly.

[0073] In some embodiments, the battery box 10 may be part of the vehicle's chassis structure. For example, a portion of the battery box 10 may be at least a part of the vehicle's floor, or a portion of the battery box 10 may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0074] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells 20, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0075] Please see Figures 3 to 6 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application; Figure 4 This is a schematic structural diagram of the insulating element 232 provided in some embodiments of this application from one perspective; Figure 5 This is a schematic diagram of the insulation element 232 provided in some embodiments of this application from another perspective; Figure 6 for Figure 5 An enlarged structural diagram of part A. This application provides a battery cell 20, including a housing 21, an electrode assembly 22, and a top cover assembly 23. The housing 21 has a cavity 211 for storing electrolyte, and the cavity 211 has an opening. The electrode assembly 22 is housed within the cavity 211. The top cover assembly 23 includes a top cover plate 231 and an insulating member 232. The top cover plate 231 covers the opening and has an injection hole. The insulating member 232 is located between the electrode assembly 22 and the top cover plate 231. The insulating member 232 includes an insulating body 2321 and a spray-proof component 2322 disposed on the insulating body 2321. The insulating body 2321 has a through hole 23211, which corresponds to and communicates with the injection hole. The spray-proof component 2322 at least partially blocks the through hole 23211 to limit the electrolyte from spraying out of the housing 21.

[0076] In this embodiment of the application, the battery cell 20 can be a secondary battery, which refers to a battery cell 20 that can be used again after being discharged by recharging to activate the active materials.

[0077] The battery cell 20 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.

[0078] In this embodiment, the housing 21 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing 21), or an aluminum-plastic film, etc. In some embodiments, the housing 21 can be a sealed structure or a non-sealed structure. As an example, when the housing 21 is a non-sealed structure, the housing 21 serves to protect the electrode assembly 22, and a sealing bag is also included between the housing 21 and the electrode assembly 22. The sealing bag is used to encapsulate the electrode assembly 22 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component 232 or an aluminum-plastic film. When the housing 21 is a sealed structure, it is used to encapsulate the electrode assembly 22 and the electrolyte, etc.

[0079] The top cover 231 refers to a component that covers the opening of the housing to isolate the internal environment of the battery cell 20 from the external environment. In any case, the shape of the top cover 231 may be adapted to the shape of the housing to fit the housing.

[0080] Optionally, the top cover 231 can be made of a material with a certain hardness and strength (such as aluminum alloy). This makes the top cover 231 less prone to deformation under pressure and impact, allowing the battery cell 20 to have higher structural strength and improved reliability. Functional components such as electrode terminals 2311 can be provided on the top cover 231. The electrode terminals 2311 can be used for electrical connection with the electrode assembly 22 to output or input electrical energy to the battery cell 20. The material of the top cover 231 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment does not impose any special limitations on this.

[0081] An insulating member 232 is located between the electrode assembly 22 and the top cover plate 231. Specifically, the insulating member 232 is disposed on the side of the top cover plate 231 facing the electrode assembly 22. The insulating member 232 is connected to the top cover plate 231, and the top cover plate 231 abuts against the electrode assembly 22 via the insulating member 232 to position the electrode assembly 22. The insulating member 232 can be used to isolate the electrical connection components within the housing 21 from the top cover plate 231 to reduce the risk of short circuits. For example, the insulating member 232 can be a plastic part, a rubber part, etc.

[0082] Electrode assembly 22 is the component in the battery cell 20 where electrochemical reactions occur. The housing 21 may contain one or more electrode assemblies 22. The electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates to separate them and reduce the risk of internal short circuits. The portions of the positive and negative electrode plates containing active material constitute the main body of the electrode assembly 22, while the portions without active material each constitute tabs 221. The positive and negative tabs 221 may be located together at one end of the main body or at opposite ends. During the charging and discharging process of the battery cell 20, the positive and negative active materials react with the electrolyte, and the tabs 221 connect to the electrode terminals 2311 to form a current loop.

[0083] For example, both the injection hole and the through hole 23211 are circular holes. The shape of the blowout preventer assembly 2322 is adapted to the shape of the through hole 23211 and is also circular. For example, the blowout preventer assembly 2322 includes a blowout preventer panel 23221 or a blowout preventer film or the like that that shields the through hole 23211.

[0084] According to the battery cell 20 provided in this application, by providing an anti-spray assembly 2322 on the insulating body 2321 of the insulating member 232, the anti-spray assembly 2322 is provided corresponding to the through hole 23211 and blocks the through hole 23211. Therefore, when the electrolyte and additives inside the housing 21 generate gas during oxidation and decomposition, the anti-spray assembly 2322 can stop the electrolyte, thereby reducing the risk of electrolyte being sprayed out from the through hole 23211 and the injection hole with the gas, thereby reducing electrolyte loss and helping to improve the cycle life of the battery cell 20.

[0085] Please see Figure 7 , Figure 7 This is a schematic diagram of the structure of a blowout preventer assembly 2322 provided in some embodiments of this application. According to some embodiments of this application, the blowout preventer assembly 2322 includes a blowout preventer panel 23221 and a plurality of first baffles 23222 connected to the periphery of the blowout preventer panel 23221. The blowout preventer panel 23221 covers the through hole 23211. The plurality of first baffles 23222 are disposed on the side of the insulating body 2321 away from the top cover plate 231 and are connected to the circumferential edge of the through hole 23211. An inlet 23225 is defined between adjacent first baffles 23222. The inlet 23225 is configured to allow the electrolyte injected by the injection hole to flow into the receiving cavity 211.

[0086] For example, the blowout preventer panel 23221 is circular, and each first baffle 23222 gradually increases in size from one side connected to the blowout preventer panel 23221 to the other side.

[0087] Multiple first baffles 23222 are spaced apart and connected to the periphery of the blowout preventer panel 23221 and the circumferential edge of the through hole 23211. This allows the blowout preventer panel 23221 to block the through hole 23211, thus preventing the electrolyte from being ejected upwards from the through hole 23211 and the injection hole when the electrolyte and additives inside the housing 21 undergo oxidation and decomposition to generate gas. Furthermore, since an inlet 23225 is defined between two adjacent first baffles 23222, when electrolyte is injected into the receiving cavity 211 of the housing 21 through the injection hole, the electrolyte can flow from the injection hole into the side of the blowout preventer panel 23221 away from the electrode assembly 22, and finally flow from the inlet 23225 into the receiving cavity 211 of the housing 21. This allows for the injection of electrolyte into the battery cell 20, and the structure and principle are relatively simple and easy to implement.

[0088] Please see Figure 6 According to some embodiments of this application, along the direction from the top cover plate 231 to the insulator 232, the projection of the injection hole on the blowout preventer assembly 2322 is located within the blowout preventer assembly 2322.

[0089] For example, along the direction from the top cover plate 231 to the insulator 232, the projection of the injection hole on the anti-spray assembly 2322 is located within the first baffle 23222.

[0090] That is, the size of the injection hole is smaller than the outer contour size of the anti-blowout component 2322, and the outer contour of the anti-blowout component 2322 can cover the through hole 23211, thereby further reducing the risk of electrolyte spraying upward from the through hole 23211.

[0091] Please see Figure 6 According to some embodiments of this application, the anti-spray panel 23221 includes an arc-shaped panel, wherein the side of the arc-shaped panel facing the electrode assembly 22 is concave and the side of the arc-shaped panel away from the electrode assembly 22 is convex.

[0092] For example, the spray shield panel 23221 may be elliptical or hemispherical.

[0093] By setting the concave surface of the arc-shaped panel towards the electrode assembly 22 and the convex surface towards the top cover plate 231, the concave surface effectively reduces electrolyte ejection during electrolyte injection and facilitates electrolyte return to the receiving cavity 211. The convex surface, facing the injection hole, acts as a buffer during electrolyte injection, reducing the risk of structural misalignment caused by direct electrolyte impact on the electrode assembly 22 within the housing 21. It also guides the electrolyte, allowing it to quickly flow from its perimeter into the receiving cavity 211 through the inlet 23225, thus improving injection efficiency.

[0094] Please see Figure 6 According to some embodiments of this application, the convex portion protrudes into the through hole 23211, and along the direction from the insulating member 232 to the top cover plate 231, the convex portion does not exceed the side surface of the insulating body 2321 facing the top cover plate 231.

[0095] The convex portion extends into the through hole 23211, thus acting as a buffer when electrolyte enters the through hole 23211 from the injection hole, reducing the flow rate of the electrolyte into the receiving cavity 211. Furthermore, the convex portion does not exceed the surface of the insulating body 2321 facing the top cover, thereby reducing the space occupied by the spray shield panel 23221 and facilitating the installation of the top cover plate 231 and the insulating component 232, improving product assembly efficiency.

[0096] Please see Figure 8 , Figure 8 This is a schematic structural diagram of another anti-spray assembly 2322 provided in some embodiments of this application. According to some embodiments of this application, the anti-spray assembly 2322 further includes a plurality of support members 23224. A support member 23224 is connected between two adjacent first baffles 23222. An inlet 23225 is formed between the support member 23224 and the anti-spray panel 23221 and the two adjacent first baffles 23222. The end of the support member 23224 facing the top cover plate 231 is fixedly connected to the insulating body 2321, and defines a flow guiding gap between the first baffles 23222 and the insulating body 2321.

[0097] For example, the support member 23224 can be a support block or a support plate. One end of each support member 23224 facing the top cover plate 231 is fixedly connected to the insulating body 2321, and the other end is fixedly connected to two adjacent first baffles 23222. Specifically, the side of the support member 23224 facing the spray-proof panel 23221 is concave, and the other side is convex.

[0098] Support member 23224 is connected between two adjacent first baffles 23222, and one end of each support member 23224 facing the top cover plate 231 is fixedly connected to the insulating body 2321, so that there is a height difference between the surface of the first baffle 23222 and the insulating body 2321, so as to define the flow guide gap, so that when the electrolyte is injected, the electrolyte can flow along the convex surface to the side surface of the first baffle 23222 facing the top cover plate 231, and flow into the receiving cavity 211 of the housing 21 through the liquid inlet 23225.

[0099] Please see Figure 8 and Figure 9 , Figure 9 for Figure 8The diagram shows a structural schematic of the anti-spray assembly 2322 from another perspective. According to some embodiments of this application, the anti-spray assembly 2322 further includes a plurality of second baffles 23223, which are correspondingly connected to the side of the plurality of first baffles 23222 away from the anti-spray panel 23221. Each second baffle 23223 is provided with a liquid inlet 23226, which is used to allow the electrolyte injected by the injection hole to flow into the receiving cavity 211.

[0100] For example, the second baffle 23223 is integrally formed with the first baffle 23222. The second baffle 23223 can serve as an extension of the first baffle 23222 to further enhance the blocking effect on the electrolyte.

[0101] The second baffle 23223 is connected to the side of the first baffle 23222 away from the anti-spray panel 23221, so that during liquid injection, the electrolyte can flow along the convex surface to the first baffle 23222 and the second baffle 23223 in sequence, and can fall into the receiving cavity 211 of the housing 21 from the liquid inlet hole 23226 on the second baffle 23223, thereby further improving the liquid injection efficiency.

[0102] Please see Figure 8 and Figure 9 According to some embodiments of this application, each second baffle 23223 is provided with multiple liquid inlet holes 23226, and the multiple liquid inlet holes 23226 are arranged at intervals along the circumferential direction of the through hole 23211.

[0103] The increased number of inlet holes 23226 on the second baffle 23223 not only further improves the main efficiency, but also improves the uniformity of electrolyte entering the containment cavity 211 and further reduces the risk of structural misalignment caused by electrolyte impacting the electrode assembly 22.

[0104] According to some embodiments of this application, the spray preventer assembly 2322 is integrally formed with the insulating body 2321.

[0105] The blowout preventer assembly 2322 and the insulating body 2321 are manufactured using an integral molding process, which can improve the assembly efficiency of the product and reduce the number of parts required to connect the blowout preventer assembly 2322 to the insulating plate, thereby reducing the production cost of the product.

[0106] Please see Figure 4 and Figure 5 According to some embodiments of this application, the insulating body 2321 is provided with a first recessed platform 2323 and a second recessed platform 2324 on both sides along the width direction of the battery cell 20.

[0107] For example, the first sinking platform 2323 and the second sinking platform 2324 can serve to fix the electrode assembly 22.

[0108] Please see Figure 3 , Figure 4 and Figure 5 According to some embodiments of this application, the top cover plate 231 is provided with a pressure relief mechanism 2312, and the insulating body 2321 is also provided with an explosion-proof recess 2325. The explosion-proof recess 2325 is correspondingly arranged with the pressure relief mechanism 2312 and is provided with at least one pressure relief hole 2326.

[0109] The pressure relief mechanism 2312 refers to an element or component that is activated to release internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold. The pressure relief mechanism 2312 can take the form of an explosion-proof valve, a gas valve, a pressure relief valve, or a safety valve, and can specifically adopt a pressure-sensitive or temperature-sensitive element or structure. That is, when the internal pressure or temperature of the battery cell 20 reaches the predetermined threshold, the pressure relief mechanism 2312 performs an action or a weak structure provided in the pressure relief mechanism 2312 is destroyed, thereby forming an opening or channel for the release of internal pressure or temperature.

[0110] The term "actuation" as used in this application refers to the pressure relief mechanism 2312 being activated or reaching a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. The action of the pressure relief mechanism 2312 may include, but is not limited to, at least a portion of the pressure relief mechanism 2312 rupturing, breaking, tearing, or opening, etc. When the pressure relief mechanism 2312 is actuated, high-temperature and high-pressure substances (such as gases) inside the battery cell 20 are discharged as waste through the pressure relief port 2326 and the actuated portion. This method enables the battery cell 20 to release pressure and temperature under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0111] According to some embodiments of this application, the electrode assembly 22 includes a positive electrode sheet, the positive electrode sheet includes a positive current collector and a positive electrode film layer disposed on at least one side surface of the positive current collector, the positive electrode film layer includes a positive electrode active material and an additive, the additive includes a first organic compound, the first organic compound includes a first functional group, the first functional group includes at least one of primary amino, secondary amino, tertiary amino, quaternary amino, nitrogen-nitrogen double bond, carbon-nitrogen double bond, and carbon-carbon double bond.

[0112] The functional groups in this application refer to the replacement of hydrogen or carbon atoms in organic compounds with other atoms or groups of atoms that determine the chemical properties of the organic compounds. The functional groups listed in this application are easily oxidized into other stable functional groups during battery cycling. These stable functional groups can stably adhere to the surface of the positive electrode active material, reducing side reactions between the positive electrode active material and the electrolyte, thereby improving the battery's cycle life.

[0113] According to some embodiments of this application, at least a portion of the surface of the positive electrode active material is formed with a solid electrolyte interface film; the solid electrolyte interface film contains a second organic compound, the second organic compound including a second functional group; the second functional group includes at least one selected from nitro, amide, imide, and carboxylic acid.

[0114] The solid electrolyte interface film of this application refers to a passivation layer formed on the surface of the positive electrode active material, which is usually formed during the first charge and discharge process of the battery. This solid electrolyte interface film has the characteristics of a solid electrolyte. It is an electronic insulator but a good conductor for metal ions. It can also effectively prevent the co-intercalation of solvent molecules in the electrolyte, avoid damage to the positive electrode active material, and thus improve the cycle life of the battery.

[0115] The first functional group listed above is described in this application. Among them, the primary amino group, secondary amino group, tertiary amino group, quaternary amino group, nitrogen-nitrogen double bond, carbon-nitrogen double bond, carbon-carbon double bond, etc. in the first functional group are oxidized to form nitro group during the first charge and discharge of the battery. The carbon-nitrogen double bond and carbon-carbon double bond are also easily oxidized to form carboxyl group. The carboxyl group reacts with the unoxidized amino group to form amide or imide. Any one or more of the listed nitro group, amide, and imide can be stably formed on the surface of the positive electrode active material.

[0116] According to some embodiments of this application, see Figures 3 to 9This application provides a battery cell 20, including a housing 21, an electrode assembly 22, and a top cover assembly 23. The housing 21 has a cavity 211 for storing electrolyte, and the cavity 211 has an opening. The electrode assembly 22 is housed within the cavity 211. The top cover assembly 23 includes a top cover plate 231 and an insulating member 232. The top cover plate 231 covers the opening and has an injection hole. The insulating member 232 is located between the electrode assembly 22 and the top cover plate 231. The insulating member 232 includes an insulating body 2321 and an anti-spray assembly 2322 disposed on the insulating body 2321. The insulating body 2321 has a through hole 23211, which corresponds to and communicates with the injection hole. The anti-spray assembly 2322 corresponds to the through hole 23211 and is used to restrict the electrolyte inside the housing 21 from spraying outwards. Specifically, the blowout preventer assembly 2322 includes a blowout preventer panel 23221, a first baffle 23222, a second baffle 23223, and a support member 23224. The blowout preventer panel 23221 includes an arc-shaped panel with a concave surface and a convex surface. The concave surface faces the electrode assembly 22, and the convex surface faces the top cover plate 231. The arc-shaped panel covers the through hole 23211 and is at least partially located within the through hole 23211. There are multiple first baffles 23222, which are spaced apart on the periphery of the blowout preventer panel 23221. Adjacent first baffles 23222... An inlet 23225 for supplying electrolyte into the housing 21 is defined between the two sides. A second baffle 23223 is connected to the side of the first baffle 23222 away from the anti-spray panel 23221, and the second baffle 23223 is provided with a plurality of inlet holes 23226 at intervals. One end of the support member 23224 is connected between two adjacent first baffles 23222 or second baffles 23223, and the other end of the support member 23224 is connected to the side of the insulating body 2321 facing the electrode assembly 22, so that a flow guiding gap is defined between the first baffle 23222 and the insulating body 2321. In this way, when the battery cell 20 is in the formation stage, and the electrolyte and additives inside the casing 21 undergo oxidative decomposition and generate a large amount of gas, the anti-blowout assembly 2322 can prevent the electrolyte from being ejected upwards through the through hole 23211 along with the gas, and can also allow the electrolyte to flow back into the casing 21 quickly, which helps to reduce electrolyte loss and improve the cycle life of the battery cell 20. Furthermore, during electrolyte injection, the electrolyte can fall from the injection hole into the through hole 23211, and then through the inlet 23225 and inlet 23226 on the anti-blowout assembly 2322 into the casing 21, reducing the risk of structural misalignment caused by the electrolyte impacting the electrode assembly 22, and improving the stability of the battery cell 20 in use.

[0117] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The housing has a receiving cavity for storing electrolyte, the receiving cavity having an opening; The electrode assembly is housed within the receiving cavity; A top cover assembly includes a top cover plate and an insulating component. The top cover plate seals the opening and has a liquid injection hole. The insulating component is located between the electrode assembly and the top cover plate. The insulating component includes an insulating body and a blowout preventer assembly disposed on the insulating body. The insulating body has a through hole, which corresponds to and is connected to the injection hole. The blowout preventer assembly at least partially blocks the through hole to limit the electrolyte inside the housing from spraying outward.

2. The battery cell according to claim 1, characterized in that, The anti-spray assembly includes an anti-spray panel and a plurality of first baffles connected to the periphery of the anti-spray panel. The anti-spray panel covers the through hole. The plurality of first baffles are disposed on the side of the insulating body away from the top cover plate and are connected to the circumferential edge of the through hole. An inlet is defined between adjacent first baffles. The inlet is configured to allow the electrolyte injected by the injection hole to flow into the receiving cavity.

3. The battery cell according to claim 2, characterized in that, Along the direction from the top cover to the insulating element, the projection of the injection hole on the blowout preventer assembly is located within the blowout preventer assembly.

4. The battery cell according to claim 2, characterized in that, The spray shield panel includes an arc-shaped panel, wherein the side of the arc-shaped panel facing the electrode assembly is concave, and the side of the arc-shaped panel away from the electrode assembly is convex.

5. The battery cell according to claim 4, characterized in that, The convex portion extends into the through hole along the direction from the insulating member to the top cover plate, and the convex portion does not exceed the side surface of the insulating body facing the top cover plate.

6. The battery cell according to any one of claims 2-5, characterized in that, The blowout preventer assembly also includes multiple support members, with one support member connected between two adjacent first baffles. An inlet is formed between the support member, the blowout preventer panel, and the two adjacent first baffles. The support member is fixedly connected to the insulating body at one end facing the top cover plate, thereby defining a flow guiding gap between the first baffle and the insulating body.

7. The battery cell according to claim 6, characterized in that, The anti-spray assembly further includes a plurality of second baffles, which are connected to the side of the plurality of first baffles away from the anti-spray panel. Each second baffle is provided with a liquid inlet hole, which is used to allow the electrolyte injected by the injection hole to flow into the receiving cavity.

8. The battery cell according to claim 7, characterized in that, The number of liquid inlet holes provided on each of the second baffles is multiple, and the multiple liquid inlet holes are arranged at intervals along the circumference of the through hole.

9. The battery cell according to any one of claims 1-5, characterized in that, The anti-spray component is integrally formed with the insulating body.

10. The battery cell according to any one of claims 1-5, characterized in that, The electrode assembly includes a positive electrode sheet, the positive electrode sheet includes a positive current collector and a positive electrode film layer disposed on at least one side surface of the positive current collector, the positive electrode film layer includes a positive electrode active material and an additive, the additive includes a first organic compound, the first organic compound includes a first functional group, the first functional group includes at least one of primary amine, secondary amine, tertiary amine, quaternary amine, nitrogen-nitrogen double bond, carbon-nitrogen double bond, and carbon-carbon double bond.

11. The battery cell according to claim 10, characterized in that, At least a portion of the surface of the positive electrode active material is formed with a solid electrolyte interface film; The solid electrolyte interface membrane contains a second organic material, which includes a second functional group; The second functional group includes at least one of nitro, amide, imide, and carboxylic acid.

12. A battery device, characterized in that, It includes one or more battery cells as described in any one of claims 1-11.

13. An electrical appliance, characterized in that, Includes the battery device as described in claim 12, wherein the battery device is used to supply power to the electrical device.

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