Cover plate assembly and battery monomer

Abstract

The utility model relates to the technical field of batteries, and discloses a cover plate assembly and a battery monomer, the cover plate assembly comprises a cover plate, an electrode terminal, a bearing part, a flanging part and a sealing piece; the bearing part and the flanging part are both arranged on the cover plate, the cover plate is provided with a first side face and a second side face in the thickness direction of the cover plate, the flanging part and the bearing part are sequentially arranged in the direction from the first side face to the second side face, and the bearing part and the flanging part are at least partially spaced to clamp the peripheral edge of the electrode terminal; the sealing element is arranged between the bearing part and the peripheral edge of the electrode terminal; the peripheral edge of the electrode terminal comprises two first peripheral edges and two second peripheral edges; the flanging part comprises two first flanges and two second flanges, in the thickness direction of the cover plate, each first flange is at least partially opposite to the corresponding first peripheral edge, and each second flange is at least partially opposite to the corresponding second peripheral edge. The sealing performance of the cover plate assembly is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a cover plate assembly and a battery cell. 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] During battery use, battery sealing is an issue that cannot be ignored. Therefore, how to improve battery sealing is a technical problem that needs to be solved today. Utility Model Content

[0004] This application provides a cover assembly and a battery cell, the sealing performance of which is improved.

[0005] To achieve the above objectives, the main technical solutions adopted in this application include:

[0006] In a first aspect, embodiments of this application provide a cover plate assembly, including a cover plate, an electrode terminal, a support portion, a flange portion, and a sealing member; along the thickness direction of the cover plate, the cover plate has a first side surface and a second side surface, and the cover plate is provided with a first through hole, which penetrates the cover plate along the thickness direction; at least a portion of the electrode terminal is disposed in the first through hole; both the support portion and the flange portion are disposed on the cover plate, and the flange portion and the support portion are arranged sequentially from the first side surface to the second side surface, and along the thickness direction of the cover plate, the support portion and the flange portion are at least partially spaced apart to clamp the outer periphery of the electrode terminal; the sealing member is disposed between the support portion and the outer periphery of the electrode terminal along the thickness direction of the cover plate; The outer periphery of the extremum includes two first outer periphery edges and two second outer periphery edges. The two first outer periphery edges are arranged opposite each other along a first direction, and the two second outer periphery edges are arranged opposite each other along a second direction. The maximum distance between the two first outer periphery edges along the first direction is L, and the maximum distance between the two second outer periphery edges along the second direction is D, satisfying: 1.2≤L / D≤2.5. The first direction and the second direction are perpendicular to the thickness direction of the cover plate. The flange portion includes two first flanges and two second flanges. Along the thickness direction of the cover plate, each first flange is at least partially opposite to the corresponding first outer periphery edge, and each second flange is at least partially opposite to the corresponding second outer periphery edge.

[0007] In the cover plate assembly proposed in this application embodiment, along the thickness direction of the cover plate, the two opposite first outer peripheral edges of the electrode terminals in the first direction are fixed by the bearing portion and the corresponding first flange, and the two opposite second outer peripheral edges of the electrode terminals in the second direction are also fixed by the bearing portion and the corresponding second flange. The sealing member is disposed between the bearing portion and the outer peripheral edges of the electrode terminals, wherein the first flange fixes the oppositely disposed first outer peripheral edges, and the second flange fixes the oppositely disposed second outer peripheral edges, thereby offsetting the rebound force on the electrode terminals generated by the sealing member due to compression, ensuring that the sealing member has sufficient compression, and improving the sealing performance of the cover plate assembly.

[0008] Furthermore, since the ratio of the maximum distance between the two first outer peripheries to the maximum distance between the two second outer peripheries satisfies the above range, it ensures that there is sufficient space between the first and second outer peripheries to accommodate the electrode terminals, thus avoiding uneven force on the electrode terminals and causing local stress concentration.

[0009] Secondly, embodiments of this application provide a battery cell, including a housing; a cover assembly as described in the above embodiments, the cover assembly being connected to the housing to form a receiving chamber; an electrode assembly and electrode tabs, the electrode assembly and electrode tabs being disposed in the receiving chamber, and the electrode tabs being respectively connected to the electrode assembly and electrode terminals. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0011] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0012] Figure 2 Exploded views of batteries provided for some embodiments of this application;

[0013] Figure 3 This is a schematic diagram of the structure of a cover plate assembly provided in some embodiments of this application;

[0014] Figure 4 This is a schematic diagram of the structure of the electrode terminals provided in some embodiments of this application;

[0015] Figure 5 This is a schematic diagram of the structure of a cover plate assembly provided in other embodiments of this application;

[0016] Figure 6 This is a schematic diagram of the structure of a cover plate assembly provided in other embodiments of this application;

[0017] Figure 7 This is a schematic diagram of the structure of a cover plate assembly provided in other embodiments of this application;

[0018] Figure 8 This is a schematic diagram of the structure of a cover plate assembly provided in other embodiments of this application;

[0019] Figure 9 This is a structural schematic diagram of a cover plate assembly provided in some other embodiments of this application.

[0020] [Explanation of Labels in the Attached Image]

[0021] 100: Battery;

[0022] 10: Box body; 11: First sub-box body; 12: Second sub-box body;

[0023] 20: Battery cell;

[0024] 200: Controller;

[0025] 300: Motor;

[0026] 1000: Vehicles;

[0027] 1: Cover plate; 101: Bearing part; 102: Flanged part; 1021: First flange; 1021a: First area; 1021b: Second area; 10211: First sub-flange; 1022: Second flange; 1022a: First segment; 1022b: Second segment; 1022c: Third segment; 10221: Second sub-flange; 1023: Connecting edge; 103: Notch; 1031: First insulating part;

[0028] 104: First side surface; 105: Second side surface; 106: First through hole;

[0029] 2: Electrode terminal; 21: Outer periphery; 211: First outer periphery; 212: Second outer periphery;

[0030] 3: Seals;

[0031] 4: Cover plate assembly;

[0032] 5: Casing;

[0033] 6: Contains a cavity;

[0034] 7: Electrode assembly;

[0035] 8: Polar ears;

[0036] X: First direction; Y: Second direction; Z: Cover plate thickness direction. Detailed Implementation

[0037] 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 and completely 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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).

[0043] As an example, a battery cell includes a cell formed by using positive and negative electrode plates as electrochemical material carriers, separating the positive and negative electrode plates through a separator to prevent short circuits, using an electrolyte as an ion transport carrier, achieving structural protection through a casing, and connecting to an external circuit through terminals.

[0044] As an example, the battery cell includes at least one of the following: a square battery cell with a steel or aluminum casing, a plastic-cased battery, a pouch battery cell, or a cylindrical battery cell.

[0045] In some embodiments, the square aluminum-cased battery includes an end cap, which may have a positive electrode terminal and a negative electrode terminal on one end face in the thickness direction. A square aluminum shell is connected to the bottom of the end cap, and the edges of the square aluminum shell and the end cap are fitted together to form a receiving space. A positive electrode plate and a negative electrode plate are disposed within the receiving space, and a separator paper is disposed between the positive and negative electrode plates. The separator paper is primarily made of at least one of polyethylene, glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.

[0046] In some embodiments, the separator paper is also referred to as Mylar membrane. The separator paper includes at least one or more thin films. When the separator paper includes multilayer composite films, the materials of each layer may be the same or different.

[0047] In some embodiments, the battery cell includes an isolation component excluding a separator paper. The isolation component includes a solid electrolyte disposed between the positive and negative electrodes. The solid electrolyte transports ions between the positive and negative electrodes and isolates the positive and negative electrodes.

[0048] In some embodiments, the square aluminum-cased battery is provided with a sealing ring, which is located between the square aluminum casing and the end cap, thereby achieving a seal between the square aluminum casing and the end cap.

[0049] In some embodiments, an insulating blue film is wrapped around the outside of the square aluminum casing to provide insulation protection for the square aluminum casing, thereby improving the reliability of the square aluminum casing battery.

[0050] In some embodiments, the active ions in the electrolyte include lithium ions, which move back and forth between the positive and negative electrode plates.

[0051] In some embodiments, the positive electrode sheet includes a positive current collector and a positive active material disposed on at least one surface of the positive current collector. The positive current collector includes two surfaces perpendicular to its thickness direction, and the positive active material is disposed on at least one of the two opposing surfaces of the positive current collector.

[0052] In some embodiments, the positive electrode current collector includes either a metal foil or a composite current collector. When the positive electrode current collector is a metal foil, it includes at least one of the following: surface-plated aluminum, stainless steel, surface-plated stainless steel, aluminum, nickel, carbon electrode, carbon, nickel, or titanium. When the positive electrode current collector includes a composite current collector, it comprises a polymer material layer and a metal layer arranged sequentially. The polymer material layer includes, but is not limited to, substrates such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, and polyethylene; the metal layer includes, but is not limited to, metallic materials such as aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys.

[0053] In some embodiments, the negative electrode includes one of a metal foil and a negative current collector. When the negative electrode includes a metal foil, the metal foil includes, but is not limited to, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium. When the negative electrode includes a negative current collector, the negative current collector includes two surfaces perpendicular to its thickness direction, and at least one of the two surfaces is provided with a negative electrode active material.

[0054] As an example, the negative electrode active material includes at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate. Silicon-based materials include at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials include 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 in batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0055] In some embodiments, when the battery cell includes a cylindrical battery cell, the cylindrical battery cell includes a cap, a housing, and a bottom spacer arranged sequentially. A sealing ring is provided between the cap and the housing, filling the gap between the cap and the housing. The cap, housing, and bottom spacer enclose a receiving space in which a wound bare battery cell is arranged. The bare battery cell includes a cathode electrode, an anode electrode, and a separator paper.

[0056] The bottom spacer has a negative electrode tab on the end face away from the accommodating space in the vertical thickness direction, and the outer shell is the negative end.

[0057] A positive terminal is provided on the end face of the cap on the side away from the receiving space in the vertical thickness direction, and a positive electrode tab is provided on the end face of the cap on the side closer to the receiving space in the vertical thickness direction. The positive electrode tab is located on the first end face of the positive electrode sheet, and the first end face is the end face perpendicular to the overlapping surface of several positive electrode sheets.

[0058] In some embodiments, the battery cell includes a pouch cell, which has a plurality of overlapping positive electrode plates, negative electrode plates, and separator paper inside. The pouch cell is enclosed by an aluminum-plastic packaging film and an insulating sheet to form a receiving space, which contains an electrolyte.

[0059] In some embodiments, battery cells are combined in series and parallel, fixed by an external frame, and connected to a battery management module with signal detection and a thermal management system for cooling to form a battery module.

[0060] In one example, the battery module includes a bottom plate for bottom protection, an end plate for end protection, a side plate for side protection, and a top cover for top protection.

[0061] The batteries disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power system for such electrical equipment can be constructed using battery cells and batteries as disclosed in this application.

[0062] This application provides an electrical device that uses a single battery cell as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0063] 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.

[0064] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 includes one of a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle, including but not limited to pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. A battery 100 is disposed at the bottom, front, or rear of the vehicle 1000. The battery 100 supplies power to the vehicle 1000. The battery 100 serves as the operating power source for the vehicle 1000, supplying power to the vehicle 1000's electrical system, including meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0065] The vehicle 1000 also includes a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, including meeting the power needs of the vehicle 1000 during startup, navigation and driving.

[0066] In some embodiments of this application, the battery 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.

[0067] like Figure 2 As shown, the battery 100 includes a housing 10 and a battery cell 20 housed therein. The housing 10 can have various structures. In some embodiments, the housing 10 includes a first sub-housing 11 and a second sub-housing 12, which are combined to form the housing 10. The first sub-housing 11 and the second sub-housing 12 together define a receiving space for accommodating the battery cell 20. The second sub-housing 12 includes a square structural member with an opening on one side, and the first sub-housing 11 also includes a square structural member with an opening on one side. The openings of the first sub-housing 11 and the second sub-housing 12 are correspondingly combined so that the first sub-housing 11 and the second sub-housing 12 together define the receiving space. The first sub-housing 11 includes a plate-like structural member, and the first sub-housing 11 and the opening side of the second sub-housing 12 are covered by the first sub-housing 11.

[0068] In battery 100, there are multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within housing 10. Alternatively, battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within housing 10. Battery 100 may also include other structures; for example, battery 100 may also include a busbar component for realizing the electrical connection between multiple battery cells 20.

[0069] The battery cell 20 includes at least one of a secondary battery or a primary battery; the battery cell 20 includes, but is not limited to, a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery.

[0070] The development of battery technology involves many design factors, such as performance parameters like energy density and discharge energy. In addition, the sealing of the battery is an issue that cannot be ignored.

[0071] A battery sealing ring is a seal installed between the battery cover and the battery casing to isolate the battery's internal and external environments. Depending on the type and size of the battery, the shape and material of the battery sealing ring vary, and materials include rubber, silicone, and polyester film. The battery sealing ring acts as an isolation layer between the battery's internal and external environments, effectively preventing electrolyte leakage and damage to the battery's external surface from moisture, dust, etc. Maintaining this isolation ensures normal battery operation and extends battery life. During use, batteries are often subjected to vibration or external shocks, which can cause abnormal movement of substances inside the battery, affecting its normal operation. Batteries with sealing rings can better resist vibration, reducing damage and ensuring normal operation. Sealing rings also effectively prevent electrolyte leakage, ensuring internal and external safety and reducing risks during battery use. However, when the sealing ring below the electrode terminals deforms elastically, it applies a rebound force to the electrode terminals, causing the center of the electrode terminal to bulge away from the tab, resulting in insufficient compression of the central sealing ring and affecting the sealing effect.

[0072] Therefore, in order to improve the battery's sealing performance, embodiments of this application provide a cover assembly, such as... Figure 3 As shown, the cover plate assembly includes a cover plate 1, a support portion 101 and a flange portion 102 disposed on the cover plate 1, an electrode terminal 2, and a sealing member 3.

[0073] Electrode terminal 2 is used to connect to external circuits and transmit electrical energy.

[0074] The cover plate 1 includes a support portion 101 and a flange portion 102. The support portion 101 is used to support the electrode terminal 2, and the flange portion 102 is used to fix the electrode terminal 2, ensuring that the electrode terminal 2 is firmly fixed to the cover plate 1, and also ensuring that the sealing element 3 has a good sealing effect.

[0075] Along the thickness direction of the cover plate 1, the cover plate 1 has a first side 104 and a second side 105, and the cover plate 1 is provided with a first through hole 106, which penetrates the cover plate 1 along the thickness direction of the cover plate 1.

[0076] At least a portion of the electrode terminal 2 is disposed in the first through hole 106, that is, the first through hole 106 can serve to accommodate the electrode terminal 2.

[0077] From the first side 104 to the second side 105, the flange portion 102 and the support portion 101 are arranged in sequence; it can be understood that the flange portion 102 and the support portion 101 fix the electrode terminal 2 in the region near the first side 104 and the region near the second side 105, respectively.

[0078] Along the thickness direction of the cover plate 1, the supporting portion 101 and the flange portion 102 are at least partially spaced apart to clamp the outer peripheral edge 21 of the electrode terminal 2. The supporting portion 101 and the flange portion 102 clamp and fix the outer peripheral edge 21 of the electrode terminal 2 from both sides along the thickness direction of the cover plate 1, ensuring that the electrode terminal 2 remains stable when subjected to the rebound force of the sealing member 3, thereby ensuring that the compression of the sealing member 3 is sufficient to achieve a sealing effect.

[0079] The seal 3 is located between the support portion 101 and the outer periphery 21 of the electrode terminal 2. The seal 3 seals the inside of the end cap, ensuring that the battery has good sealing performance and providing a good sealed environment for the internal reaction of the battery.

[0080] The outer periphery 21 of the electrode terminal 2 includes two first outer periphery 211 and two second outer periphery 212. The two first outer periphery 211 are arranged opposite each other along the first direction X, and the two second outer periphery 212 are arranged opposite each other along the second direction Y. The first direction X and the second direction Y are perpendicular to each other with the thickness direction Z of the cover plate 1.

[0081] like Figure 4 As shown, along the first direction X, the maximum distance between the two first outer perimeter edges 211 is L, and along the second direction Y, the maximum distance between the two second outer perimeter edges 212 is D, satisfying: 1.2≤L / D≤2.5. Therefore, the electrode terminal 2 is constructed as an electrode terminal with a racetrack-shaped or rectangular cross-section.

[0082] In the above scheme, since the ratio of the maximum distance between the two first outer peripheral edges 211 to the maximum distance between the two second outer peripheral edges 212 satisfies the above range, on the one hand, it can ensure that the first outer peripheral edge 211 and the second outer peripheral edge 212 respectively contact different sides of the electrode terminal 2, avoiding uneven force when the electrode terminal 2 is fixed and reducing the probability of local stress concentration; on the other hand, it can ensure that there is enough space between the first outer peripheral edge 211 and the second outer peripheral edge 212 to accommodate the electrode terminal 2.

[0083] like Figure 5 As shown, the flange portion 102 includes two first flanges 1021 and two second flanges 1022. Along the thickness direction of the cover plate 1, each first flange 1021 is disposed opposite to at least a portion of the corresponding first outer peripheral edge 211, and each second flange 1022 is disposed opposite to at least a portion of the corresponding second outer peripheral edge 212.

[0084] It is understandable that the two first flanges 1021 and the two second flanges 1022 are arranged opposite each other along the first direction X and the second direction Y, which can better fix the electrode terminal 2 and avoid problems such as the middle area of ​​the electrode terminal 2 bulging away from the electrode tab due to the rebound force of the seal 3 below the electrode terminal 2.

[0085] In other embodiments, adjacent first flanges 1021 and second flanges 1022 are arranged circumferentially at intervals along the electrode terminal 2, and a notch 103 is formed at the interval.

[0086] In the above scheme, the notch 103 is located between the adjacent first flange 1021 and second flange 1022, which reduces the stress concentration between the first flange 1021 and the second flange 1022, ensures the strength of the first flange 1021 and the second flange 1022, and realizes that the first flange 1021 and the second flange 1022 are close in length and have balanced strength, which can better fix the electrode terminal 2.

[0087] In other embodiments, the seal 3 is constructed as an annular structure with the ends connected. The compression amount of the seal 3 along the thickness direction of the cover plate 1 is D1, which satisfies: 0.3mm≤D1≤0.9mm; the minimum distance between adjacent first flange 1021 and second flange 1022 is D2, which is 3mm≤D2≤10mm, satisfying 0.05≤D1 / D2≤0.5.

[0088] In the above scheme, the annular structure with the ends connected helps to ensure the continuity of the seal, reduce the risk of leakage, and under the above compression, it can ensure that the seal 3 and the electrode terminal 2 and the end cap form good contact, thereby improving the sealing effect.

[0089] It is understandable that, because the minimum distance between the first flange 1021 and the second flange 1022 in this solution meets the above range, on the one hand, the sealing effect can be guaranteed; on the other hand, the strength of the flange 102 can be guaranteed to restrict the movement of the electrode terminal 2.

[0090] Optionally, D1 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, or 0.9mm. It is understood that the above values ​​are merely examples of this application, and any value falling within the above range is within the protection scope of this application.

[0091] D2 can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, or 9mm. It is understood that the above values ​​are just examples of this application, and as long as they fall within the above range, they are all within the protection scope of this application.

[0092] D1 / D2 can be selected as 0.05, 0.1, 0.2, 0.3, 0.4, or 0.5. It is understood that the above values ​​are merely examples in this application, and any values ​​falling within the above range are within the protection scope of this application.

[0093] In other embodiments, the minimum distance between adjacent first flanges 1021 and second flanges 1022 is D2, which satisfies: 3mm≤D2≤10mm.

[0094] In the above scheme, since the minimum distance between the first flange 1021 and the second flange 1022 meets the above range, on the one hand, it can ensure that the strength of the first flange 1021 and the second flange 1022 is balanced; on the other hand, it can ensure that the strength of the first flange 1021 and the second flange 1022 is sufficient to limit the displacement of the electrode terminal 2, ensure that the sealing member 3 has sufficient compression, and improve the sealing effect of the sealing member 3.

[0095] Optionally, D2 can be 3mm, 4mm, 5mm, 6mm, 7mm, 7mm, 9mm, or 10mm. It is understood that the above values ​​are merely examples of this application, and anything falling within the above range is within the protection scope of this application.

[0096] In other embodiments, such as Figure 6 As shown, the flange portion 102 also includes a connecting edge 1023, which is disposed on the cover plate 1 and extends away from the cover plate 1 along the thickness direction of the cover plate 1.

[0097] The connecting edge 1023 is constructed as a ring structure with its ends connected. One end of the connecting edge 1023 is connected to the cover plate 1, and the other end is connected to the two first flanges 1021 and the second flange 1022. It can be understood that the connecting edge 1023 separates the cover plate 1 from the first flanges 1021 and the second flanges 1022, thereby forming a space for clamping the outer periphery of the electrode terminal 2, and can also support the first flanges 1021 and the second flanges 1022, thereby improving the structural strength of the entire flange portion 102.

[0098] In the above scheme, the connecting edge 1023 of the annular structure that connects the beginning and end surrounds the outer periphery of the electrode terminal 2, which can prevent the sealing ring from being exposed and the electrolyte from being corroded.

[0099] In other embodiments, the electrode terminal 2 has two long edges and two short edges, the two long edges being arranged opposite each other in a second direction, and the two short edges being arranged opposite each other in a first direction. The two long edges and the two short edges form a racetrack-like structure. The long edges and the second flange 1022 may be arranged opposite each other in the second direction, and the short edges and the first flange 1021 may be arranged opposite each other in the first direction.

[0100] The second flange 1022 has a larger dimension in the first direction X than the first flange 1021 in the second direction Y, ensuring that the second flange 1022 has better stability and fixing effect. It can be understood that when the second flange 1022 is subjected to large forces, increasing the size of the second flange 1022 can disperse and reduce stress concentration, optimize stress distribution, and reduce the risk of structural failure.

[0101] In the above scheme, because the size of the second flange 1022 in the first direction X is larger than the size of the first flange 1021 in the second direction Y, the contact area between the second flange 1022 and the outer periphery of the electrode terminal 2 is larger than the contact area between the first flange 1021 and the outer periphery of the electrode terminal 2. This provides a tighter contact for the outer periphery of the electrode terminal 2, and the strength of the first flange 1021 and the second flange 1022 is sufficient to limit the displacement of the electrode terminal 2 and ensure the sealing effect of the sealing member 3.

[0102] In other embodiments, such as Figure 7 As shown, the second flange 1022 includes a first segment 1022a, a second segment 1022b, and a third segment 1022c arranged sequentially along the first direction X;

[0103] The size of the second segment 1022b remains unchanged in the second direction Y. From the second segment 1022b to the first segment 1022a, the size of the first segment 1022a gradually decreases in the second direction Y. From the second segment 1022b to the third segment 1022c, the size of the third segment 1022c gradually decreases in the second direction Y.

[0104] In other words, the notch between the second flange 1022 and the first flange 1021 can be constructed as a trumpet-shaped structure that is wider on the outside and narrower on the inside.

[0105] Understandably, the second segment 1022b, as the middle part, maintains a larger size to provide better stability and fixation, which helps to disperse and reduce stress concentration. The first segment 1022a and the third segment 1022c gradually decrease in size along their respective directions away from the second segment 1022b, which can alleviate the edge effect, make the stress distribution more uniform, and reduce the risk of failure due to stress concentration.

[0106] In the above scheme, because the size of the first segment 1022a gradually decreases in the second direction Y from the direction from the second segment 1022b to the first segment 1022a; and the size of the third segment 1022c gradually decreases in the second direction Y from the direction from the second segment 1022b to the third segment 1022c; this makes the connection between the second flange 1022 and the connecting edge 1023 stronger.

[0107] In other embodiments, the second flange 1022 has a dimension L1 in the first direction X, where 5mm ≤ L1 ≤ 30mm, and a maximum dimension W1 in the second direction Y, where 1.5mm ≤ W1 ≤ 5mm, satisfying: 20mm 2 ≤L1*W1≤55mm 2 .

[0108] In the above scheme, since the size of the second flange 1022 in the first direction X and its maximum size in the second direction Y satisfy the above range, the size of the second flange 1022 in the first direction X and the second direction Y is balanced. On the one hand, it can ensure that the second flange 1022 has sufficient strength to press against the outer periphery of the electrode terminal 2 and ensure structural stability; on the other hand, it can ensure that the second flange 1022 has sufficient fixing strength and ensure fixing effect.

[0109] Optionally, L1 can be 5mm, 8mm, 10mm, 13mm, 15mm, 18mm, 20mm, 23mm, 25mm, 28mm, or 30mm. It is understood that the above values ​​are merely examples of this application, and anything falling within the above range is within the protection scope of this application.

[0110] W1 can be 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, or 5mm. It is understood that the above values ​​are merely examples in this application, and anything falling within the above range is within the protection scope of this application.

[0111] L1 / W1 can be selected as 201mm 2 25mm 2 30mm 2 35mm 2 40mm 2 45mm 2 50mm 2 55mm 2 It is understood that the above values ​​are merely examples of this application, and anything falling within the above range is within the protection scope of this application.

[0112] It is understandable that, since the dimensions of the second flange 1022 in the first direction X and its maximum dimensions in the second direction Y satisfy the above range, on the one hand, the second flange 1022 can be guaranteed to have sufficient strength to press against the outer periphery of the electrode terminal 2, thus ensuring structural stability; on the other hand, the length and width of the second flange 1022 can be balanced, thus ensuring better fixation of the electrode terminal 2.

[0113] In other embodiments, the second flange 1022 has a dimension of L1 in the first direction X, and the first flange 1021 has a dimension of L2 in the second direction Y, where 6mm≤L2≤30mm, satisfying: 0.16≤L1 / L2≤5.

[0114] In the above scheme, since the dimensions of the second flange 1022 in the first direction X and the dimensions of the first flange 1021 in the second direction Y satisfy the above range, on the one hand, the fixing effect of the first flange 1021 and the second flange 1022 can be guaranteed; on the other hand, the lengths of the first flange 1021 and the second flange 1022 can be guaranteed to be similar, and the strength of the multiple flanges is balanced without any shortcomings.

[0115] Optionally, L2 can be 6mm, 8mm, 10mm, 13mm, 15mm, 18mm, 20mm, 23mm, 25mm, 28mm, or 30mm. It is understood that the above values ​​are merely examples of this application, and anything falling within the above range is within the protection scope of this application.

[0116] Optionally, L1 / L2 can be selected as 0.16, 0.6, 1.16, 1.6, 2.16, 2.6, 3.16, 3.6, 4.16, 4.6, or 5. It is understood that the above values ​​are merely examples of this application, and any values ​​falling within the above range are within the protection scope of this application.

[0117] In other embodiments, the maximum dimension of the second flange 1022 in the second direction Y is W1, and the maximum dimension of the first flange 1021 in the first direction X is W2, 3mm≤W2≤9mm, satisfying: 0.16≤W1 / W2≤1.67.

[0118] In the above scheme, since the ratio of the maximum dimension of the second flange 1022 in the second direction Y to the maximum dimension of the first flange 1021 in the first direction X satisfies the above range, on the one hand, it can ensure that both the first flange 1021 and the second flange 1022 can play a sufficient fixing effect and improve the sealing performance; on the other hand, it can optimize the internal strength distribution, so that the first flange 1021 and the second flange 1022 have balanced strength without any shortcomings, preventing deformation or failure under stress.

[0119] It is understandable that because the ratio of the maximum dimension of the second flange 1022 in the second direction Y to the maximum dimension of the first flange 1021 in the first direction X satisfies the above range, the widths of the first flange 1021 and the second flange 1022 are balanced, thereby indirectly controlling the width of the notch 103.

[0120] W2 can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, or 9mm. It is understood that the above values ​​are merely examples in this application, and anything falling within these ranges is protected under this application.

[0121] Optionally, W1 / W2 can be selected as 0.16, 0.36, 0.56, 0.76, 0.96, 1.16, 1.36, 1.56, or 1.67.

[0122] In other embodiments, please refer to Figure 6 and Figure 8 The maximum thickness of the first flange 1021 is T1, 0.5mm≤T1≤1.5mm, and the maximum thickness of the second flange 1022 is T2, 0.5mm≤T2≤1.5mm, satisfying: 0≤|T1-T2|≤1.

[0123] In the above scheme, since the ratio of the maximum thickness of the first flange 1021 to the maximum thickness of the second flange 1022 meets the above range, on the one hand, it can ensure that the fixing strength of the first flange 1021 and the second flange 1022 is sufficient to restrict the movement of the electrode terminal 2 and ensure the sealing effect of the sealing member 3; on the other hand, it can ensure that the strength of the first flange 1021 and the second flange 1022 is balanced, and avoid stress unevenness causing deformation or failure.

[0124] Optionally, T1 can be 0.5mm, 0.6mm, 0.8mm, 1.0mm, 1.3mm, or 1.5mm. It is understood that the above values ​​are merely examples of this application, and anything falling within the above range is within the protection scope of this application.

[0125] Optionally, |T1-T2| can be 0mm, 0.1mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, or 1mm. It is understood that the above values ​​are merely examples of this application, and anything falling within the above range is within the protection scope of this application.

[0126] In other embodiments, the first flange 1021 has a first region 1021a near the notch 103, and the second flange 1022 has a second region 1021b near the notch 103. The thickness of the first region 1021a and the second region 1021b gradually increases along their respective directions away from the notch 103.

[0127] In the above scheme, as the thickness of the first region 1021a and the second region 1021b increases, the strength of the first flange 1021 and the second flange 1022 gradually increases, which can ensure the fixed strength of the flange portion 102, and the thicker flange portion 102 can better withstand alternating loads, reducing the generation and propagation of cracks caused by fatigue.

[0128] It is understandable that stress concentration often occurs at the connection between the first flange 1021 and the second flange 1022 and the connecting edge 1023 due to changes in shape and size. By changing the thickness of the first region 1021a and the second region 1021b, stress can be dispersed and edge effects can be alleviated, making the stress distribution more uniform and reducing the risk of failure due to stress concentration.

[0129] In other embodiments, a first insulating portion 1031 is provided within the notch 103 to ensure the insulation of the notch 103, and the first insulating portion 1031 within the notch 103 can enhance the fixation of the electrode terminal 2, ensuring the insulation effect. The first insulating portion 1031 includes, but is not limited to, injection-molded insulating parts, and this application does not limit it.

[0130] In other embodiments, along the thickness direction of the cover plate 1, the end of the electrode terminal 2 away from the battery cell extends beyond the first flange 1021 and the second flange 1022. This ensures insulation between the electrode terminal 2 and the first flange 1021 and the second flange 1022, guaranteeing insulation safety.

[0131] It is understandable that when the notch 103 is provided with the first insulating part 1031, the end of the first insulating part 1031 away from the battery cell along the thickness direction of the cover plate 1 may be flush with or not flush with the first flange 1021 and the second flange 1022.

[0132] In other embodiments, the first flange 1021 includes a plurality of first sub-flaps 10211, which are arranged at intervals along the circumference of the electrode terminal 2. The plurality of first sub-flaps 10211 can share the stress, thereby dispersing stress concentration, reducing the risk of damage caused by excessive stress, and improving the overall reliability and deformation resistance, which helps to better fix the electrode terminal 2 and ensure the sealing effect.

[0133] In other embodiments, such as Figure 9 As shown, the second flange 1022 includes multiple second sub-flaps 10221, which are arranged at intervals along the circumference of the electrode terminal 2. The multiple second sub-flaps 10221 can share the stress, thereby dispersing stress concentration, reducing the risk of damage caused by excessive stress, and improving the overall reliability and deformation resistance. This helps to better fix the electrode terminal 2 and ensure the sealing effect.

[0134] In another embodiment, this application provides a battery cell 20, including a housing 5; a cover assembly 4 as described in any of the preceding embodiments, the cover assembly 4 being connected to the housing 5 to form a receiving chamber 6; an electrode assembly 7 and electrode tabs 8, the electrode assembly 7 and electrode tabs 8 being disposed in the receiving chamber 6, and the electrode tabs 8 being connected to the electrode assembly 7 and electrode terminals 2, respectively. Because the battery cell 20 of this application embodiment has the aforementioned cover assembly, the sealing performance of the battery cell 20 is improved.

[0135] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0136] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0137] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0138] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A cover plate assembly, characterized in that, include: A cover plate, having a first side and a second side along its thickness direction, and a first through hole extending through the cover plate along its thickness direction; An electrode terminal, at least a portion of which is disposed in the first through hole; The cover plate has a support portion and a flange portion, both of which are disposed on the cover plate. From the first side to the second side, the flange portion and the support portion are arranged in sequence. Along the thickness direction of the cover plate, the support portion and the flange portion are at least partially spaced apart to clamp the outer periphery of the electrode terminal. A sealing element is disposed between the bearing portion and the outer periphery of the electrode terminal along the thickness direction of the cover plate; The outer periphery of the electrode terminal includes two first outer periphery edges and two second outer periphery edges. The two first outer periphery edges are arranged opposite each other along a first direction, and the two second outer periphery edges are arranged opposite each other along a second direction. The maximum distance between the two first outer periphery edges along the first direction is L, and the maximum distance between the two second outer periphery edges along the second direction is D, satisfying: 1.2≤L / D≤2.

5. The first direction and the second direction are perpendicular to the thickness direction of the cover plate. The flanged portion includes two first flanges and two second flanges. Along the thickness direction of the cover plate, each first flange is at least partially opposite to the corresponding first outer peripheral edge, and each second flange is at least partially opposite to the corresponding second outer peripheral edge.

2. The cover plate assembly according to claim 1, characterized in that, Along the circumference of the electrode terminal, adjacent first flanges and second flanges are spaced apart to form a notch.

3. The cover plate assembly according to claim 2, characterized in that, The sealing element is constructed as a ring structure with the ends connected. Along the thickness direction of the cover plate, the compression amount of the sealing element is D1, which satisfies: 0.3mm≤D1≤0.9mm. The minimum distance between adjacent first flanges and second flanges is D2, 3mm≤D2≤10mm, satisfying: 0.05≤D1 / D2≤0.

5.

4. The cover plate assembly according to claim 2, characterized in that, The minimum distance between adjacent first flanges and second flanges is D2, which satisfies: 3mm≤D2≤10mm.

5. The cover plate assembly according to claim 1, characterized in that, The flanged portion also includes a connecting edge, one end of which is connected to the cover plate along the thickness direction of the cover plate, and the other end of which extends away from the cover plate. The connecting edge is constructed as a ring structure with the two ends connected, and the two first flanges and the two second flanges are all connected to the other end of the connecting edge.

6. The cover plate assembly according to claim 2, characterized in that, The dimension of the second flange in the first direction is greater than the dimension of the first flange in the second direction.

7. The cover plate assembly according to claim 6, characterized in that, The second flange includes a first segment, a second segment, and a third segment, wherein along the first direction, the first segment and the third segment are respectively connected to both ends of the second segment; The second segment has a constant size in the second direction. From the second segment to the first segment, the size of the first segment in the second direction gradually decreases. From the second segment to the third segment, the size of the third segment in the second direction gradually decreases.

8. The cover plate assembly according to claim 6, characterized in that, The second flange has a dimension L1 in the first direction, where 5mm ≤ L1 ≤ 30mm, and a maximum dimension W1 in the second direction, where 1.5mm ≤ W1 ≤ 5mm, satisfying: 20mm. 2 ≤L1*W1≤55mm 2 .

9. The cover plate assembly according to claim 2, characterized in that, The second flange has a dimension of L1 in the first direction and the first flange has a dimension of L2 in the second direction. 6mm≤L2≤30mm, satisfying: 0.16≤L1 / L2≤5.

10. The cover plate assembly according to claim 6, characterized in that, The maximum dimension of the second flange in the second direction is W1, and the maximum dimension of the first flange in the first direction is W2. 3mm≤W2≤9mm satisfies: 0.16≤W1 / W2≤1.

67.

11. The cover plate assembly according to claim 6, characterized in that, The maximum thickness of the first flange is T1, 0.5mm≤T1≤1.5mm, and the maximum thickness of the second flange is T2, 0.5mm≤T2≤1.5mm, satisfying: 0≤|T1-T2|≤1.

12. The cover plate assembly according to claim 2, characterized in that, The first flange has a first region near the notch, and the second flange has a second region near the notch. The thickness of the first region gradually increases in the direction away from the notch, and the thickness of the second region gradually increases in the direction away from the notch.

13. The cover plate assembly according to claim 2, characterized in that, A first insulating part is provided inside the notch.

14. The cover plate assembly according to claim 1, characterized in that, Along the thickness direction of the cover plate, the end of the electrode terminal away from the battery cell extends beyond the first flange and the second flange.

15. The cover plate assembly according to claim 1, characterized in that, Along the circumference of the electrode terminal, the first flange includes a plurality of spaced first sub-flaps, and the second flange includes a plurality of spaced second sub-flaps.

16. A single battery cell, characterized in that, include: case; The cover assembly according to any one of claims 1-15, wherein the cover assembly is connected to the housing to form a receiving chamber; An electrode assembly and a tab are disposed in the receiving chamber, and the tab is connected to the electrode assembly and the electrode terminal, respectively.

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