Battery cell, battery device, and electric device

Abstract

The application provides a battery monomer, a battery device and a power consumption device, which can improve the use performance of the battery monomer. The battery monomer comprises a shell, an electrode terminal and a sealing component. The shell comprises a first wall, the first wall is provided with an electrode lead-out hole, and an accommodating cavity is formed in the shell. The electrode terminal is arranged on the first wall, and the electrode terminal is arranged opposite to the electrode lead-out hole. The sealing component is arranged between the first wall and the electrode terminal and surrounds the outer periphery of the electrode lead-out hole. The side of the electrode terminal facing the accommodating cavity is provided with a protruding structure, the side of the sealing component facing the protruding structure is provided with a groove structure, and at least part of the protruding structure is accommodated in the groove structure.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, in addition to improving the electrical performance of battery devices, sealing performance is also an issue that cannot be ignored. If the sealing performance of the individual battery cells in a battery device cannot be guaranteed, the battery device cannot be used normally, thus reducing its performance. Therefore, how to improve the performance of individual battery cells has become a pressing technical problem to be solved in this field. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device that can improve the performance of the battery cell.

[0005] In a first aspect, this application provides a battery cell, the battery cell comprising: a housing including a first wall having an electrode lead-out hole, the housing having an internal cavity; an electrode terminal disposed on the first wall, the electrode terminal being disposed opposite to the electrode lead-out hole; and a sealing member disposed between the first wall and the electrode terminal and surrounding the outer periphery of the electrode lead-out hole; wherein the electrode terminal has a protrusion structure on the side facing the cavity, and the sealing member has a groove structure on the side facing the protrusion structure, at least a portion of the protrusion structure being accommodated in the groove structure.

[0006] In this embodiment, a sealing component is provided in the battery cell, and a protruding structure is provided on the side of the electrode terminal facing the receiving cavity, and a groove structure is provided on the side of the sealing component facing the protruding structure, with at least a portion of the protruding structure being accommodated in the groove structure. This improves the sealing performance between the electrode terminal and the first wall, thereby reducing the risk of electrolyte leakage due to mutual displacement between the sealing component and the electrode terminal under different operating conditions, and thus improving the performance of the battery cell.

[0007] In some embodiments, the entire protrusion structure is accommodated within the groove structure.

[0008] In this embodiment, by setting the entire protruding structure to be accommodated within the groove structure, the sealing performance between the electrode terminal and the first wall is further improved. This effectively reduces the risk of electrolyte leakage caused by mutual displacement between the sealing component and the electrode terminal under different operating conditions, thereby improving the performance of the battery cell.

[0009] In some embodiments, the sealing member includes a first surface toward the electrode terminal, the protrusion structure includes a first protrusion extending toward the first surface, the groove structure includes a first groove formed on the first surface, and at least a portion of the first protrusion is received in the first groove.

[0010] In this embodiment of the application, by configuring the sealing component to include a first surface facing the electrode terminal, configuring the protrusion structure to include a first protrusion extending toward the first surface, and configuring the groove structure to include a first groove formed on the first surface, at least a portion of the first protrusion is accommodated in the first groove, so as to balance the sealing performance and manufacturing performance of the battery cell, thereby improving the performance of the battery cell.

[0011] In some embodiments, along the thickness direction of the sealing member, the dimension D2 of the first groove and the dimension D1 of the sealing member satisfy the following condition: 0.3≤D2 / D1≤0.4.

[0012] In this embodiment, along the thickness direction of the sealing component, the size D2 of the first groove and the size D1 of the sealing component are set to satisfy: 0.3≤D2 / D1≤0.4, so as to take into account both the sealing performance and assembly performance between the sealing component and the electrode terminal, while facilitating the processing and manufacturing of the battery cell, so as to improve the performance of the battery cell.

[0013] In some embodiments, in the direction perpendicular to the thickness of the sealing member, the dimension D4 of the first groove and the dimension D3 of the sealing member satisfy the following condition: 0.2 ≤ D4 / D3 ≤ 0.25.

[0014] In this embodiment, in the direction perpendicular to the thickness of the sealing component, the size D4 of the first groove and the size D3 of the sealing component are set to satisfy: 0.2≤D4 / D3≤0.25, so as to take into account both the sealing performance and assembly performance between the sealing component and the electrode terminal, and at the same time facilitate the processing and manufacturing of the battery cell, so as to improve the performance of the battery cell.

[0015] In some embodiments, a second groove is formed on the surface of the electrode terminal facing the receiving cavity, the bottom wall of the second groove includes the first protrusion, and a portion of the sealing member is received in the second groove.

[0016] In this embodiment, by forming a second groove on the surface of the electrode terminal facing the receiving cavity, the bottom wall of the second groove includes the first protrusion, and a portion of the sealing member is accommodated in the second groove, the sealing performance of the battery cell is further improved. At the same time, under different operating conditions, the risk of electrolyte leakage caused by mutual displacement between the sealing member and the electrode terminal is effectively reduced, thereby improving the performance of the battery cell.

[0017] In some embodiments, the sealing member includes a second surface facing or away from the electrode lead-out hole, the second surface being adjacent to the first surface, the protrusion structure including a second protrusion extending toward the second surface, and the groove structure including a third groove formed on the second surface, at least a portion of the second protrusion being received in the third groove.

[0018] In this embodiment, by configuring the sealing component to include a second surface facing or away from the electrode lead-out hole, the second surface being adjacent to the first surface, the protrusion structure including a second protrusion extending toward the second surface, and the groove structure including a third groove formed on the second surface, with at least a portion of the second protrusion accommodated in the third groove, it is possible to balance the sealing performance and manufacturing performance of the battery cell, and at the same time, effectively reduce the risk of electrolyte leakage caused by mutual displacement between the sealing component and the electrode terminal under different operating conditions, thereby improving the performance of the battery cell.

[0019] In some embodiments, the sealing member includes a third surface facing away from the electrode terminal, the third surface being opposite to the first surface, the first wall including a third protrusion extending toward the third surface, the third surface forming a fourth groove with an opening toward the first wall, at least a portion of the third protrusion being received in the fourth groove.

[0020] In this embodiment, by configuring the sealing component to include a third surface facing away from the electrode terminal, the third surface being opposite to the first surface, and the first wall being configured to include a third protrusion extending toward the third surface, the third surface forming a fourth groove with an opening toward the first wall, and at least a portion of the third protrusion being accommodated in the fourth groove, it is possible to balance the sealing performance and assembly performance between the sealing component and the first wall, and at the same time, effectively reduce the risk of electrolyte leakage caused by mutual displacement between the sealing component and the first wall under different operating conditions, thereby improving the performance of the battery cell.

[0021] In some embodiments, a fifth groove is formed on the surface of the first wall facing the sealing member, and the third protrusion is formed on the bottom wall of the fifth groove, and a portion of the sealing member is accommodated in the fifth groove.

[0022] In this embodiment, the surface of the first wall facing the sealing member is configured to form a fifth groove, the bottom wall of the fifth groove is formed with the third protrusion, and a portion of the sealing member is accommodated in the fifth groove. This is to balance the sealing performance and manufacturing performance of the battery cell, and at the same time, to effectively reduce the risk of electrolyte leakage caused by mutual displacement between the sealing member and the first wall under different operating conditions, thereby improving the performance of the battery cell.

[0023] In some embodiments, along the thickness direction of the sealing member, the dimensions D2 of the first groove, D5 of the fourth groove, and D1 of the sealing member satisfy the following condition: 0.3 ≤ D2 + D5 / D1 ≤ 0.4.

[0024] In this embodiment, along the thickness direction of the sealing component, the dimensions D2 of the first groove, D5 of the fourth groove, and D1 of the sealing component are set to satisfy: 0.3≤D2+D5 / D1≤0.4, so as to take into account the sealing performance and assembly performance between the sealing component, the electrode terminal and the first wall, while facilitating the processing and manufacturing of the battery cell, so as to improve the performance of the battery cell.

[0025] In some embodiments, the number of protrusions is set to multiple, the number of grooves is set to multiple, and the multiple protrusions correspond one-to-one with the multiple grooves.

[0026] In this embodiment of the application, by setting the number of the protrusion structure to multiple and the number of the groove structure to multiple, and with each of the protrusion structure corresponding to one of the groove structures, the sealing performance between the electrode terminal and the first wall is further improved. This reduces the risk of electrolyte leakage caused by mutual displacement between the sealing component and the electrode terminal under different operating conditions, thereby improving the performance of the battery cell.

[0027] In some embodiments, the sealing component is made of fluorosilicone or polyurethane.

[0028] In this embodiment, by setting the material of the sealing component to fluorosilicone or polyurethane, the sealing performance between the electrode terminal and the first wall is effectively improved, thereby reducing the risk of electrolyte leakage caused by mutual displacement between the sealing component and the electrode terminal under different operating conditions, and thus improving the performance of the battery cell.

[0029] In a second aspect, a battery device is provided, comprising: a plurality of battery cells, wherein the battery cells are those described in the first aspect or its various implementations.

[0030] Thirdly, an electrical device is provided, including the battery device described in the second aspect, the battery device being used to provide electrical energy to the electrical device.

[0031] In some implementations, the electrical device can be a vehicle, ship, or spacecraft. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application.

[0034] Figure 2 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application.

[0035] Figure 3 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application.

[0036] Figure 4 This is an exploded structural diagram of a battery cell provided in another embodiment of this application.

[0037] Figure 5 This is a partial structural schematic diagram of a battery cell provided in one embodiment of this application.

[0038] Figure 6 This is a partial cross-sectional schematic diagram of a battery cell provided in an embodiment of this application.

[0039] Figure 7 This is a partial cross-sectional schematic diagram of a battery cell provided in another embodiment of this application.

[0040] Figure 8 This is a partial cross-sectional schematic diagram of a battery cell provided in another embodiment of this application.

[0041] Figure 9 This is a partial cross-sectional schematic diagram of a battery cell provided in another embodiment of this application.

[0042] Figure 10 This is a partial cross-sectional schematic diagram of a battery cell provided in an embodiment of this application.

[0043] Figure 11 This is a partial cross-sectional schematic diagram of a battery cell provided in another embodiment of this application.

[0044] Figure 12This is a partial cross-sectional schematic diagram of a battery cell provided in another embodiment of this application.

[0045] Explanation of reference numerals in the attached drawings: 1-Vehicle; 10-Battery unit; 20-Battery cell; 30-Controller; 40-Motor; 11-Casing; 111-First part; 112-Second part; 112a-Base plate; 112b-Side plate; 21-Outer shell; 22-Electrode assembly; 211-Housing shell; 212-End cap; 222-Electrode tab; 222a-Positive electrode tab; 222b-Negative electrode tab; 213-Pressure relief mechanism; 214-Electrode terminal; 2141-Main body; 2142-Insulation part; 2143-Fixing part; 21 4a - First electrode terminal; 214b - Second electrode terminal; 215 - First wall; 216 - Electrode lead-out hole; 23 - Adapter component; 50 - Receiving cavity; 60 - Sealing component; 70 - Protrusion structure; 80 - Groove structure; 610 - First surface; 710 - First protrusion; 810 - First groove; 230 - Second groove; 231 - Bottom wall; 620 - Second surface; 720 - Second protrusion; 820 - Third groove; 630 - Third surface; 240 - Third protrusion; 830 - Fourth groove; 250 - Fifth groove.

[0046] The accompanying drawings are not drawn to scale. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0049] In this application, the reference to "embodiment" means that a specific 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 mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0052] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0053] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0054] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0055] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0056] In this embodiment, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery device in this embodiment can also be called a battery.

[0057] The battery cell 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.

[0058] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0059] In some embodiments, the positive electrode may 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.

[0060] 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.

[0061] 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.).

[0062] In some embodiments, the positive 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 positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

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

[0064] As an example, the negative electrode current collector 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.).

[0065] 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.

[0066] 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.

[0067] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. 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 cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0068] 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.

[0069] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0070] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0071] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] In some embodiments, the battery cell 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.

[0076] Liquid electrolytes include electrolyte salts and solvents.

[0077] 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 properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0078] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid—lithium salt.

[0079] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0080] 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.

[0081] 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-sulfur, sulfosilium-germanium), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0082] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0083] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0084] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0085] In some implementations, the electrode assembly is a stacked structure.

[0086] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0087] 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.

[0088] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0089] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0090] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0091] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0092] 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.

[0093] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0094] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0095] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0096] In some embodiments, a pressure relief mechanism is provided on the casing. The pressure relief mechanism is used to release the internal gas of the battery cell.

[0097] As an example, the internal pressure or temperature of a battery cell is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is broken, thereby creating an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell.

[0098] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0099] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0100] The term "actuation" as used in this application refers to the activation or actuation of the pressure relief mechanism to a certain state, thereby releasing the internal pressure and temperature of the battery cell. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the mechanism, etc. When the pressure relief mechanism is activated, the high-temperature, high-pressure substances inside the battery cell are discharged as waste from the activated portion. This method allows for pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0101] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for venting gas inside the battery cell.

[0102] The emissions from battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0103] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0104] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0105] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0106] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0107] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0108] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0109] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0110] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0111] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0112] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0113] The battery device in this embodiment can also be referred to as an energy storage device. This energy storage device includes one or more battery clusters to increase the voltage and capacity of the energy storage device. A battery cluster may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0114] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0115] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0116] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0117] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0118] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device via piping to regulate the temperature of the individual battery cells.

[0119] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes auxiliary battery management units, integrated switches, and other modules.

[0120] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an insulation monitoring module, a main battery management unit, and Ethernet and fiber optic conversion modules.

[0121] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0122] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0123] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development. In the development of battery technology, besides improving the electrical performance of the battery pack, sealing performance is also an issue that cannot be ignored. If the sealing performance of the individual battery cells cannot be guaranteed, the battery pack cannot function properly, reducing its performance. For example, a sealing component is usually installed between the electrode terminals and the casing of the battery cell. Because the sealing component and the electrode terminals are in interference fit and have planar contact, the sealing component is prone to deformation under different operating conditions, leading to excessive local stress. This can cause relative displacement between the sealing component and the electrode terminals, posing a risk of electrolyte leakage and reducing the performance of the battery cell. Therefore, how to improve the performance of battery cells has become a pressing technical problem to be solved in this field.

[0124] Therefore, this application provides a battery cell, a battery device, and an electrical device. The battery cell includes a casing, electrode terminals, and a sealing component. The casing includes a first wall with an electrode lead-out hole. A receiving cavity is formed inside the casing. The electrode terminals are disposed on the first wall, opposite to the electrode lead-out hole. The sealing component is disposed between the first wall and the electrode terminals and surrounds the outer periphery of the electrode lead-out hole. The electrode terminals have a protruding structure on the side facing the receiving cavity, and the sealing component has a groove structure on the side facing the protruding structure, with at least a portion of the protruding structure accommodated in the groove structure. Thus, in this application embodiment, by providing a sealing component in the battery cell, and having a protruding structure on the side of the electrode terminals facing the receiving cavity, and a groove structure on the side of the sealing component facing the protruding structure, with at least a portion of the protruding structure accommodated in the groove structure, the sealing performance between the electrode terminals and the first wall is improved. This reduces the risk of electrolyte leakage due to mutual displacement between the sealing component and the electrode terminals under different operating conditions, thereby improving the performance of the battery cell.

[0125] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0126] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0127] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical devices described above, but can also be applied to all devices that use batteries. For the sake of simplicity, the following embodiments will be described in detail using a vehicle as an example of an electrical device.

[0128] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 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 motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0129] To meet different power demands, the battery device 10 in this embodiment may include at least one battery cell assembly, which comprises multiple battery cells. These multiple battery cells can be electrically connected in series, parallel, or a combination thereof to form the battery device 10. A combination of series and parallel connections is used. The battery device 10 may also be referred to as a battery pack. For example, multiple battery cells can first be connected in series, parallel, or a combination to form a battery module, and then multiple battery modules can be connected in series, parallel, or a combination thereof to form the battery device 10. That is, multiple battery cells can directly form the battery device 10, or they can first be assembled into battery modules, and then the battery modules can be assembled into the battery device 10.

[0130] For example, such as Figure 2 The diagram shown is a structural schematic of a battery device 10 according to an embodiment of this application. The battery device 10 may include a plurality of battery cells 20. The battery device 10 may also include a housing 11 (or cover), the housing 11 having a hollow structure, and the plurality of battery cells 20 are housed within the housing 11. For example, the plurality of battery cells 20 may be connected in parallel, in series, or in a mixed configuration and then placed within the housing 11.

[0131] like Figure 2 As shown, the housing 11 may include two parts, referred to here as the first part 111 and the second part 112, which are fastened together. The shapes of the first part 111 and the second part 112 can be determined according to the combined shape of multiple battery cells 20. Both the first part 111 and the second part 112 may have an opening. For example, both the first part 111 and the second part 112 may be hollow cuboids with only one open face. The openings of the first part 111 and the second part 112 are opposite to each other, and the first part 111 and the second part 112 are fastened together to form a housing 11 with a closed cavity. The housing may include a bottom plate 112a, side plates 112b, and beams. Multiple battery cells 20 are connected in parallel, series, or mixed configurations and placed inside the housing 11 formed by the fastening of the first part 111 and the second part 112.

[0132] Optionally, the battery device 10 may also include other structures, which will not be described in detail here. For example, the battery device 10 may also include a busbar component for realizing the electrical connection between multiple battery cells 20, such as parallel, series, or mixed connection. Specifically, the busbar component can realize the electrical connection between battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the housing by a conductive mechanism. Optionally, the conductive mechanism may also be part of the busbar component.

[0133] The number of battery cells 20 can be set to any value depending on different power requirements. Multiple battery cells 20 can be connected in series, parallel, or mixed to achieve a larger capacity or power. Since each battery device 10 may include a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is unlimited and can be set according to requirements.

[0134] In this embodiment, the number of battery cells 20 can be set to any value according to different power requirements. Multiple battery cells 20 can be connected in series, parallel, or mixed connection to achieve a larger capacity or power. Since each battery device 10 may include a large number of battery cells 20, for ease of installation, the battery cells 20 can be grouped, with each group of battery cells 20 forming a battery module. The number of battery cells 20 included in a battery module is not limited and can be set according to requirements. The battery device 10 may include multiple battery modules, which can be connected in series, parallel, or mixed connection.

[0135] Figure 3 This diagram shows an exploded view of the battery cell 20 provided in one embodiment of the present application. Figure 4 An exploded structural diagram of a battery cell 20 according to another embodiment of this application is shown. Figure 3 and Figure 4 As shown, the battery cell 20 in this embodiment may include: a housing 21 and an electrode assembly 22. The housing 21 has a closed receiving cavity 50, and the electrode assembly 22 is placed in the receiving cavity 50 within the housing 21. The housing 21 may include a shell 211 and an end cap 212. The shell 211 is a hollow structure with at least one opening 510; the end cap 212 is used to fasten with the shell 211 to form the housing 21 with the closed receiving cavity 50.

[0136] In some embodiments, the end cap 212 may be a plate-like structure used to cover the opening 510 of the housing 211. In other embodiments, the end cap 212 has a similar structure to the housing 211, that is, both the housing 211 and the end cap 212 are hollow structures with one opening 510, and the two openings 510 are joined together to form an outer shell 21 with a closed accommodating space.

[0137] It should be understood that if the end cap 212 is a plate-like structure, the housing 211 can be a hollow structure with one or more openings 510. For example, if the housing 211 is a hollow structure with one opening 510, the end cap 212 can be set as one; if the housing 211 is a hollow structure with openings 510 at opposite ends, the end cap 212 can be set as two, and the two end caps 212 respectively cover the openings 510 at both ends of the housing 211.

[0138] The outer shell 21 can be of various shapes, such as a cylinder, a cuboid, or other polyhedrons. For example, ... Figure 3 and Figure 4 As shown in the embodiments of this application, the description mainly takes the outer shell 21 as a cuboid structure.

[0139] It should be understood that the end cap 212 in this embodiment is used to cooperate with the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 212 can be adapted to the shape of the housing 211, such as... Figure 3 and Figure 4 As shown, the shell 211 has a cuboid structure, and the end cap 212 has a rectangular plate structure that is adapted to the shell 211.

[0140] The material of the housing 211 in this embodiment may include one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 212 may also be one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 212 may be the same as or different from that of the housing 211; the materials of the different walls of the housing 211 may also be the same or different.

[0141] The end cap 212 in this embodiment can be any wall of the outer shell 21. For example, the end cap 212 can be the wall with the largest area among the multiple walls included in the outer shell 21, or the wall with the smallest area, or it can be other walls. This embodiment is not limited to this. Alternatively, the end cap 212 can also be other structures. For example, the end cap 212 can also be a groove with an opening to cover the opening 510 of the housing 211. This embodiment is not limited to this.

[0142] It should be understood that the battery cell 20 also includes electrode terminals 214. In this embodiment, the electrode terminals 214 are used for electrical connection with the electrode assembly 22 inside the battery cell 20 to output the electrical energy of the battery cell 20. Figures 3 to 4 As shown, the battery cell 20 may include at least two electrode terminals 214, which may include at least one first electrode terminal 214a and at least one second electrode terminal 214b. Exemplarily, if the first electrode terminal 214a is a positive electrode terminal, it is used for electrical connection to the positive electrode tab 222a of the electrode assembly 22; if the second electrode terminal 214b is a negative electrode terminal, it is used for electrical connection to the negative electrode tab 222b of the electrode assembly 22. The first electrode terminal 214a and the positive electrode tab 222a may be directly connected or indirectly connected, as may the negative electrode terminal 214b and the negative electrode tab 222b. Exemplarily, the first electrode terminal 214a may be electrically connected to the positive electrode tab 222a via an adapter 23, and the second electrode terminal 214b may be electrically connected to the negative electrode tab 222b via an adapter 23. It should be understood that in the embodiments of this application, the positive electrode tab 222a and the negative electrode tab 222b can be collectively referred to as electrode tab 222.

[0143] In this embodiment, the wall of the housing 211 and the wall of the end cap 212 are both referred to as the wall of the battery cell 20. Figure 3 and Figure 4 The rectangular battery cell 20 shown has a housing 211 with a bottom wall and four side walls. The housing 211 is shaped according to the combination of one or more electrode assemblies 22. For example, the housing 211 can be a hollow cuboid, cube, or cylinder, and one face of the housing 211 has an opening to allow one or more electrode assemblies 22 to be placed inside. For example, when the housing 211 is a hollow cuboid or cube, one plane of the housing 211 is an open face, meaning that this plane has no wall, allowing communication between the inside and outside of the housing 211. When the housing 211 is a hollow cylinder, the end face of the housing 211 is an open face, meaning that this end face has no wall, allowing communication between the inside and outside of the housing 211. An end cap 212 covers the opening and connects to the housing 211 to form a closed cavity for placing the electrode assemblies 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0144] In this battery cell 20, the electrode assembly 22 is the component in which the electrochemical reaction occurs. Depending on actual usage requirements, the electrode assembly 22 within the casing 211 can be one or multiple. For example, as... Figure 4 As shown, two electrode assemblies 22 are provided inside the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylindrical structure, the housing 211 can also be a cylindrical structure. If the electrode assembly 22 is a cuboid structure, the housing 211 can also be a cuboid structure.

[0145] In this battery cell 20, the electrode assembly 22 is the component in which the electrochemical reaction occurs. Depending on actual usage requirements, the electrode assembly 22 within the casing 211 can be one or multiple. For example, as... Figure 4 As shown, two electrode assemblies 22 are disposed within the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylindrical structure, the housing 211 can also be a cylindrical structure; if the electrode assembly 22 is a cuboid structure, the housing 211 can also be a cuboid structure. In this embodiment, the material of the housing 211 may include the following materials: copper, iron, aluminum, steel, aluminum alloy, etc.

[0146] A pressure relief mechanism 213 may also be provided on the battery cell 20. The pressure relief mechanism 213 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold.

[0147] The pressure relief mechanism 213 can be any of the possible pressure relief mechanisms 213. For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism, which is configured to melt when the internal temperature of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold; and / or, the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal gas pressure of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold.

[0148] Figure 5 A partial structural schematic diagram of a battery cell 20 provided in another embodiment of this application is shown.

[0149] Figure 6 A partial cross-sectional schematic diagram of a battery cell 20 provided in an embodiment of this application is shown.

[0150] In some implementations, such as Figures 3 to 6 As shown, the battery cell 20 includes: a housing 21, electrode terminals 214, and a sealing component 60. The housing 21 includes a first wall 215, which has an electrode lead-out hole 216. A receiving cavity 50 is formed inside the housing 21. The electrode terminal 214 is disposed on the first wall 215 and is disposed opposite to the electrode lead-out hole 216. The sealing component 60 is disposed between the first wall 215 and the electrode terminal 214 and surrounds the outer periphery of the electrode lead-out hole 216. The electrode terminal 214 has a protrusion structure 70 on the side facing the receiving cavity 50, and the sealing component 60 has a groove structure 80 on the side facing the protrusion structure 70. At least part of the protrusion structure 70 is accommodated in the groove structure 80.

[0151] It should be understood that the outer casing 21 in this embodiment includes a housing 211 and an end cap 212. Exemplarily, the first wall 215 in this embodiment may be formed on the housing 211 or the end cap 212. That is, the wall of the housing 211 is provided with an electrode lead-out hole 216 extending through the housing 211 along its thickness direction; or, the end cap 212 is provided with an electrode lead-out hole 216 extending through the end cap 212 along its thickness direction. It should also be understood that the receiving cavity 50 formed inside the outer casing 21 can be used to receive the electrode assembly 22.

[0152] It should also be understood that the shape of the electrode lead-out hole 216 in this embodiment can be matched with the shape of the electrode terminal 214. For example, the shape of the electrode lead-out hole 216 in the plane perpendicular to the thickness direction of the housing 21 can be set as follows: Figure 5 The circle shown in the image.

[0153] It should also be understood that the electrode terminal 214 and the electrode lead-out hole 216 being arranged opposite each other in the embodiments of this application can mean that, on a plane perpendicular to the thickness direction of the housing 21, the orthographic projection of the electrode terminal 214 covers the orthographic projection of the electrode lead-out hole 216.

[0154] It should also be understood that, such as Figure 6 As shown, the electrode terminal 214 in this embodiment may include a main body 2141, an insulating part 2142, and a fixing part 2143. The insulating part 2142 is disposed on the outer periphery of the main body 2141, and the fixing part 2143 is separated from the main body 2141 by the insulating part 2142. The fixing part 2143 is connected to both the insulating part 2142 and the first wall 215, and the fixing part 2143 may be configured as a conductive structure. Specifically, the main body 2141, the insulating part 2142, the fixing part 2143, and the first wall 215 are connected in sequence to fix the electrode terminal 214 to the first wall 215, and the insulating part 2142 is used to achieve insulation between the main body 2141 and the first wall 215. It should also be understood that the main body 2141, the insulating part 2142, and the fixing part 2143 can be assembled by injection molding, and then the electrode terminal 214 is assembled to the first wall 215.

[0155] It should also be understood that the sealing member 60 being disposed between the first wall 215 and the electrode terminal 214 may mean that the sealing member 60 is attached to the first wall 215 and the electrode terminal 214 respectively, or that the sealing member 60 may be fixedly connected to the first wall 215 and the electrode terminal 214 respectively.

[0156] It should also be understood that the provision of a protruding structure 70 on the side of the electrode terminal 214 facing the receiving cavity 50 may mean that the electrode terminal 214 and the protruding structure 70 are integrally formed, or that the protruding structure 70 is fixedly connected to the surface of the electrode terminal 214 on the side facing the receiving cavity 50.

[0157] It should also be understood that the sealing member 60 has a groove structure 80 on the side facing the protrusion structure 70, the shape of the groove structure 80 can be matched with the protrusion structure 70, and at least part of the protrusion structure 70 is accommodated in the groove structure 80.

[0158] In this embodiment, by providing a sealing component 60 in the battery cell 20, and providing a protruding structure 70 on the side of the electrode terminal 214 facing the receiving cavity 50, and providing a groove structure 80 on the side of the sealing component 60 facing the protruding structure 70, at least a portion of the protruding structure 70 is accommodated in the groove structure 80, so as to improve the sealing performance between the electrode terminal 214 and the first wall 215, thereby reducing the risk of electrolyte leakage caused by mutual displacement between the sealing component 60 and the electrode terminal 214 under different operating conditions, and thus improving the performance of the battery cell 20.

[0159] Figure 7 A partial cross-sectional schematic diagram of a battery cell 20 provided in another embodiment of this application is shown.

[0160] In some implementations, such as Figure 7 As shown, the entire protrusion structure 70 is accommodated within the groove structure 80.

[0161] It should be understood that when the entire protrusion 70 is accommodated within the groove structure 80, the surface of the protrusion 70 facing the groove structure 80 may be attached or fixedly connected to the inner surface of the groove structure 80.

[0162] In this embodiment of the application, by setting the entire protrusion structure 70 to be accommodated in the groove structure 80, the sealing performance between the electrode terminal 214 and the first wall 215 is further improved, so as to effectively reduce the risk of electrolyte leakage caused by mutual displacement between the sealing component 60 and the electrode terminal 214 under different operating conditions, thereby improving the performance of the battery cell 20.

[0163] In some implementations, such as Figure 7 As shown, the sealing member 60 includes a first surface 610 facing the electrode terminal 214, the protrusion structure 70 includes a first protrusion 710 extending toward the first surface 610, and the groove structure 80 includes a first groove 810 formed on the first surface 610, with at least a portion of the first protrusion 710 being received in the first groove 810.

[0164] It should be understood that the protrusion structure 70 includes a first protrusion 710 extending toward the first surface 610, which means that the first protrusion 710 can extend toward the first groove 810, and the shape of the first protrusion 710 can be matched with the shape of the first groove 810 to limit the displacement of the electrode terminal 214 in the thickness direction perpendicular to the first wall 215, thereby reducing the risk of electrolyte leakage caused by mutual displacement between the sealing member 60 and the electrode terminal 214 under different operating conditions.

[0165] In this embodiment, by configuring the sealing member 60 to include a first surface 610 facing the electrode terminal 214, the protrusion structure 70 to include a first protrusion 710 extending toward the first surface 610, and the groove structure 80 to include a first groove 810 formed on the first surface 610, at least a portion of the first protrusion 710 is accommodated in the first groove 810, so as to balance the sealing performance and manufacturing performance of the battery cell 20, thereby improving the performance of the battery cell 20.

[0166] In some implementations, such as Figure 7 As shown, along the thickness direction of the sealing member 60, the dimension D2 of the first groove 810 and the dimension D1 of the sealing member 60 satisfy the following condition: 0.3≤D2 / D1≤0.4.

[0167] It should be understood that, along the thickness direction of the sealing member 60, the dimension D2 of the first groove 810 in this embodiment can refer to the maximum, minimum, or average dimension of the first groove 810 along the thickness direction of the sealing member 60. Similarly, the dimension D1 of the sealing member 60 in this embodiment can refer to the maximum, minimum, or average dimension of the sealing member 60 along its thickness direction.

[0168] For example, along the thickness direction of the sealing member 60, the ratio D2 / D1 between the size D2 of the first groove 810 and the size D1 of the sealing member 60 can be set to: 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, etc., or its value is within the range obtained by any combination of the above two values.

[0169] In this embodiment, along the thickness direction of the sealing component 60, the dimension D2 of the first groove 810 and the dimension D1 of the sealing component 60 are set to satisfy: 0.3≤D2 / D1≤0.4, so as to take into account both the sealing performance and assembly performance between the sealing component 60 and the electrode terminal 214, while facilitating the processing and manufacturing of the battery cell 20, so as to improve the performance of the battery cell 20.

[0170] In some implementations, such as Figure 7 As shown, in the thickness direction perpendicular to the sealing member 60, the dimension D4 of the first groove 810 and the dimension D3 of the sealing member 60 satisfy the following condition: 0.2≤D4 / D3≤0.25.

[0171] It should be understood that, in the thickness direction perpendicular to the sealing member 60, the dimension D4 of the first groove 810 in this embodiment can refer to the maximum, minimum, or average dimension of the first groove 810 in the thickness direction perpendicular to the sealing member 60. Similarly, the dimension D3 of the sealing member 60 in this embodiment can refer to the maximum, minimum, or average dimension of the sealing member 60 in the thickness direction perpendicular to the sealing member 60.

[0172] For example, in the thickness direction perpendicular to the sealing member 60, the ratio D4 / D3 between the dimension D4 of the first groove 810 and the dimension D3 of the sealing member 60 can be set to: 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, etc., or its value is within the range obtained by any combination of the above two values.

[0173] In this embodiment, in the thickness direction perpendicular to the sealing member 60, the dimension D4 of the first groove 810 and the dimension D3 of the sealing member 60 are set to satisfy: 0.2≤D4 / D3≤0.25, so as to take into account both the sealing performance and assembly performance between the sealing member 60 and the electrode terminal 214, while facilitating the processing and manufacturing of the battery cell 20, so as to improve the performance of the battery cell 20.

[0174] Figure 8 A partial cross-sectional schematic diagram of a battery cell 20 provided in another embodiment of this application is shown.

[0175] In some implementations, such as Figure 8 As shown, a second groove 230 is formed on the surface of the electrode terminal 214 facing the receiving cavity 50. The bottom wall 231 of the second groove 230 includes the first protrusion 710. A portion of the sealing member 60 is accommodated in the second groove 230.

[0176] It should be understood that the shape of the second groove 230 can be matched with the shape of the sealing member 60 facing the electrode terminal 214, so that the portion of the sealing member 60 facing the electrode terminal 214 is accommodated in the second groove 230, effectively limiting the displacement of the electrode terminal 214 in the thickness direction perpendicular to the first wall 215, and reducing the risk of electrolyte leakage caused by mutual displacement between the sealing member 60 and the electrode terminal 214 under different operating conditions.

[0177] In this embodiment, by forming a second groove 230 on the surface of the electrode terminal 214 facing the receiving cavity 50, the bottom wall 231 of the second groove 230 includes the first protrusion 710, and a portion of the sealing member 60 is accommodated in the second groove 230, the sealing performance of the battery cell 20 is further improved. At the same time, under different operating conditions, the risk of electrolyte leakage caused by mutual displacement between the sealing member 60 and the electrode terminal 214 is effectively reduced, thereby improving the performance of the battery cell 20.

[0178] Figure 9 A partial cross-sectional schematic diagram of a battery cell 20 provided in another embodiment of this application is shown.

[0179] In some implementations, the sealing member 60 includes a second surface 620 facing or away from the electrode lead-out hole 216, the second surface 620 being adjacent to the first surface 610, the protrusion structure 70 including a second protrusion 720 extending toward the second surface 620, and the groove structure 80 including a third groove 820 formed on the second surface 620, at least a portion of the second protrusion 720 being received in the third groove 820.

[0180] It should be understood that, such as Figure 9 As shown, the sealing member 60 includes a second surface 620 facing the electrode lead-out hole 216, and the groove structure 80 includes a third groove 820 formed on the second surface 620, with at least a portion of the second protrusion 720 received in the third groove 820. In other implementations, the sealing member 60 may include a second surface facing away from the electrode lead-out hole 216, and the groove structure 80 includes a third groove 820 formed on the second surface 620, with at least a portion of the second protrusion 720 received in the third groove 820.

[0181] It should also be understood that the shape of the second protrusion 720 can be matched with the shape of the third groove 820. In the embodiments of this application, at least a portion of the second protrusion 720 is accommodated in the third groove 820. Exemplarily, the entire second protrusion 720 is accommodated in the third groove 820, which effectively limits the displacement of the electrode terminal 214 in the thickness direction perpendicular to the first wall 215. Under different operating conditions, this reduces the risk of electrolyte leakage caused by mutual displacement between the sealing member 60 and the electrode terminal 214.

[0182] In this embodiment, by configuring the sealing component 60 to include a second surface 620 facing or away from the electrode lead-out hole 216, the second surface 620 being adjacent to the first surface 610, the protrusion structure 70 including a second protrusion 720 extending toward the second surface 620, and the groove structure 80 including a third groove 820 formed on the second surface 620, with at least a portion of the second protrusion 720 being accommodated in the third groove 820, the sealing performance and manufacturing performance of the battery cell 20 are balanced, and the risk of electrolyte leakage due to mutual displacement between the sealing component 60 and the electrode terminal 214 is effectively reduced under different operating conditions, thereby improving the performance of the battery cell 20.

[0183] Figure 10 A partial cross-sectional schematic diagram of a battery cell 20 provided in another embodiment of this application is shown.

[0184] In some implementations, such as Figure 10 As shown, the sealing member 60 includes a third surface 630 facing away from the electrode terminal 214, the third surface 630 being opposite to the first surface 610, the first wall 215 including a third protrusion 240 extending toward the third surface 630, the third surface 630 forming a fourth groove 830 with an opening toward the first wall 215, at least a portion of the third protrusion 240 being received in the fourth groove 830.

[0185] It should be understood that the third protrusion 240 in this embodiment can be integrally formed with or separately formed from the first wall 215. For example, the third protrusion 240 can be integrally stamped with the first wall 215. It should also be understood that the shape of the third protrusion 240 can be matched with the shape of the fourth groove 830.

[0186] For example, in this embodiment, the third protrusion 240 can be fully accommodated in the fourth groove 830, effectively limiting the displacement of the sealing member 60 in the thickness direction perpendicular to the first wall 215, so as to effectively reduce the risk of electrolyte leakage caused by mutual displacement between the sealing member 60 and the first wall 215 under different operating conditions.

[0187] In this embodiment, by configuring the sealing component 60 to include a third surface 630 facing away from the electrode terminal 214, the third surface 630 being opposite to the first surface 610, and the first wall 215 being configured to include a third protrusion 240 extending toward the third surface 630, the third surface 630 forming a fourth groove 830 with an opening toward the first wall 215, and at least a portion of the third protrusion 240 being accommodated in the fourth groove 830, it is possible to balance the sealing performance and assembly performance between the sealing component 60 and the first wall 215, and at the same time, effectively reduce the risk of electrolyte leakage caused by mutual displacement between the sealing component 60 and the first wall 215 under different operating conditions, thereby improving the performance of the battery cell 20.

[0188] Figure 11 A partial cross-sectional schematic diagram of a battery cell 20 provided in another embodiment of this application is shown.

[0189] In some implementations, such as Figure 11 As shown, a fifth groove 250 is formed on the surface of the first wall 215 facing the sealing member 60, and a third protrusion 240 is formed on the bottom wall of the fifth groove 250. A portion of the sealing member 60 is accommodated in the fifth groove 250.

[0190] It should be understood that the shape of the fifth groove 250 in the embodiments of this application can be matched with the shape of the portion of the sealing member 60 facing the first wall 215 or the fifth groove 250.

[0191] It should also be understood that the portion of the sealing member 60 facing the fifth groove 250 in the embodiments of this application can be configured to be accommodated in the fifth groove 250, effectively limiting the displacement of the sealing member 60 in the thickness direction perpendicular to the first wall 215, so as to effectively reduce the risk of electrolyte leakage caused by mutual displacement between the sealing member 60 and the first wall 215 under different operating conditions.

[0192] In this embodiment, the surface of the first wall 215 facing the sealing member 60 is configured to form a fifth groove 250, the bottom wall of the fifth groove 250 is formed with the third protrusion 240, and a portion of the sealing member 60 is accommodated in the fifth groove 250. This is to balance the sealing performance and manufacturing performance of the battery cell 20, and at the same time, to effectively reduce the risk of electrolyte leakage caused by mutual displacement between the sealing member 60 and the first wall 215 under different operating conditions, thereby improving the performance of the battery cell 20.

[0193] In some implementations, such as Figure 11As shown, along the thickness direction of the sealing component 60, the dimensions D2 of the first groove 810, D5 of the fourth groove 830, and D1 of the sealing component 60 satisfy the following condition: 0.3≤D2+D5 / D1≤0.4.

[0194] It should be understood that, along the thickness direction of the sealing member 60, the dimension D5 of the fourth groove 830 can refer to the maximum, minimum, or average dimension of the fourth groove 830 along the thickness direction of the sealing member 60.

[0195] For example, along the thickness direction of the sealing member 60, the ratio D2+D5 / D1 between the sum of the dimensions D2 of the first groove 810 and the fourth groove 830 and the dimension D1 of the sealing member 60 can be set to: 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, etc., or its value is within the range obtained by any combination of the above two values.

[0196] In this embodiment, along the thickness direction of the sealing component 60, the dimensions D2 of the first groove 810, D5 of the fourth groove 830, and D1 of the sealing component 60 are set to satisfy: 0.3≤D2+D5 / D1≤0.4. This balances the sealing performance and assembly performance between the sealing component 60, the electrode terminal 214, and the first wall 215, while also facilitating the processing and manufacturing of the battery cell 20, thereby improving the performance of the battery cell 20.

[0197] Figure 12 A partial cross-sectional schematic diagram of a battery cell 20 provided in another embodiment of this application is shown.

[0198] In some implementations, such as Figure 12 As shown, the number of protrusions 70 is set to multiple, and the number of grooves 80 is set to multiple, with each of the protrusions 70 corresponding to one of the grooves 80.

[0199] It should be understood that the number of protrusions 70 and grooves 80 in the embodiments of this application can be set according to actual needs. For example, as shown... Figure 12 As shown, the sealing component 60 may be provided with two groove structures 80, and the electrode terminal 214 may be provided with two corresponding protrusion structures 70 on the side facing the sealing component 60.

[0200] In this embodiment of the application, by setting the number of the protrusion structure 70 to multiple and the number of the groove structure 80 to multiple, and with each of the protrusion structure 70 corresponding to one of the groove structure 80, the sealing performance between the electrode terminal 214 and the first wall 215 is further improved. This reduces the risk of electrolyte leakage caused by mutual displacement between the sealing component 60 and the electrode terminal 214 under different operating conditions, thereby improving the performance of the battery cell 20.

[0201] In some implementations, the sealing component 60 is made of fluorosilicone or polyurethane. Thus, in this embodiment, by using fluorosilicone or polyurethane as the material for the sealing component 60, the sealing performance between the electrode terminal 214 and the first wall 215 is effectively improved. This reduces the risk of electrolyte leakage due to mutual displacement between the sealing component 60 and the electrode terminal 214 under different operating conditions, thereby improving the performance of the battery cell 20.

[0202] According to some embodiments of this application, this application also provides an electrical device, including the battery device 10 in any of the above embodiments, the battery device 10 being used to provide electrical energy to the electrical device. Specifically, the electrical device can be the above... Figure 1 The vehicle 1 shown can also be any electrical device that uses the battery device 10.

[0203] The power supply device can be any of the aforementioned devices or systems that utilize battery device 10.

[0204] According to some embodiments of this application, see Figures 3 to 7This application provides a battery cell 20, which includes a housing 21, electrode terminals 214, and a sealing member 60. The housing 21 includes a first wall 215, which is provided with an electrode lead-out hole 216. A receiving cavity 50 is formed inside the housing 21. The electrode terminal 214 is disposed on the first wall 215 and is disposed opposite to the electrode lead-out hole 216. The sealing member 60 is disposed between the first wall 215 and the electrode terminal 214 and surrounds the outer periphery of the electrode lead-out hole 216. The electrode terminal 214 has a protrusion structure 70 on the side facing the receiving cavity 50, and the sealing member 60 has a groove structure 80 on the side facing the protrusion structure 70. The entire protrusion structure 70 is accommodated in the groove structure 80. The sealing member 60 includes a first surface 610 facing the electrode terminal 214, the protrusion structure 70 includes a first protrusion 710 extending toward the first surface 610, and the groove structure 80 includes a first groove 810 formed on the first surface 610, with at least a portion of the first protrusion 710 received in the first groove 810. Along the thickness direction of the sealing member 60, the dimension D2 of the first groove 810 and the dimension D1 of the sealing member 60 satisfy the following condition: 0.3 ≤ D2 / D1 ≤ 0.4. In the direction perpendicular to the thickness of the sealing member 60, the dimension D4 of the first groove 810 and the dimension D3 of the sealing member 60 satisfy the following condition: 0.2 ≤ D4 / D3 ≤ 0.25.

[0205] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. 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 in that, include: The outer shell (21) includes a first wall (215), the first wall (215) is provided with an electrode lead-out hole (216), and the inner part of the outer shell (21) forms a receiving cavity (50); An electrode terminal (214) is disposed on the first wall (215), and the electrode terminal (214) is disposed opposite to the electrode lead-out hole (216); A sealing component (60) is disposed between the first wall (215) and the electrode terminal (214) and surrounds the outer periphery of the electrode lead-out hole (216); The electrode terminal (214) has a protrusion structure (70) on the side facing the receiving cavity (50), and the sealing member (60) has a groove structure (80) on the side facing the protrusion structure (70), with at least a portion of the protrusion structure (70) being received in the groove structure (80).

2. The battery cell according to claim 1, characterized in that, The entire protruding structure (70) is accommodated within the groove structure (80).

3. The battery cell according to claim 2, characterized in that, The sealing member (60) includes a first surface (610) facing the electrode terminal (214), the protrusion structure (70) includes a first protrusion (710) extending toward the first surface (610), and the groove structure (80) includes a first groove (810) formed on the first surface (610), at least a portion of the first protrusion (710) being received in the first groove (810).

4. The battery cell according to claim 3, characterized in that, Along the thickness direction of the sealing member (60), the dimension D2 of the first groove (810) and the dimension D1 of the sealing member (60) satisfy the following condition: 0.3≤D2 / D1≤0.

4.

5. The battery cell according to claim 4, characterized in that, In the direction perpendicular to the thickness of the sealing member (60), the dimension D4 of the first groove (810) and the dimension D3 of the sealing member (60) satisfy the following condition: 0.2≤D4 / D3≤0.

25.

6. The battery cell according to claim 3, characterized in that, A second groove (230) is formed on the surface of the electrode terminal (214) facing the receiving cavity (50), the bottom wall (231) of the second groove (230) includes the first protrusion (710), and a portion of the sealing member (60) is received in the second groove (230).

7. The battery cell according to claim 3, characterized in that, The sealing member (60) includes a second surface (620) facing or away from the electrode lead-out hole (216), the second surface (620) being adjacent to the first surface (610), the protrusion structure (70) including a second protrusion (720) extending toward the second surface (620), and the groove structure (80) including a third groove (820) formed on the second surface (620), at least a portion of the second protrusion (720) being received in the third groove (820).

8. The battery cell according to claim 3, characterized in that, The sealing member (60) includes a third surface (630) facing away from the electrode terminal (214), the third surface (630) being opposite to the first surface (610), the first wall (215) including a third protrusion (240) extending toward the third surface (630), the third surface (630) forming a fourth groove (830) opening toward the first wall (215), at least a portion of the third protrusion (240) being received in the fourth groove (830).

9. The battery cell according to claim 8, characterized in that, A fifth groove (250) is formed on the surface of the first wall (215) facing the sealing member (60), and the third protrusion (240) is formed on the bottom wall of the fifth groove (250), and a portion of the sealing member (60) is accommodated in the fifth groove (250).

10. The battery cell according to claim 9, characterized in that, Along the thickness direction of the sealing component (60), the dimensions D2 of the first groove (810), D5 of the fourth groove (830), and D1 of the sealing component (60) satisfy the following: 0.3≤D2+D5 / D1≤0.

4.

11. The battery cell according to any one of claims 1 to 10, characterized in that, The number of protruding structures (70) is set to multiple, and the number of groove structures (80) is set to multiple, with each of the protruding structures (70) corresponding to one of the groove structures (80).

12. The battery cell according to any one of claims 1 to 10, characterized in that, The sealing component (60) is made of fluorosilicone or polyurethane.

13. A battery device, characterized in that, include: Multiple battery cells, wherein the battery cells are as described in any one of claims 1 to 12.

14. An electrical appliance, characterized in that, include: The battery device of claim 13, wherein the battery device is used to provide electrical energy to the electrical device.

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