Insulating patches, end cap assemblies, individual cells and energy storage devices

Abstract

This application provides an insulating patch, an end cap assembly, a single battery cell, and an energy storage device. The insulating patch of this application includes a top patch, which comprises a first bonding portion, a connecting portion, and a second bonding portion connected in sequence. The connecting portion is disposed around the outer periphery of the first bonding portion, and the second bonding portion is disposed around the outer periphery of the connecting portion. The first bonding portion, the connecting portion, and the second bonding portion are sequentially bent and connected, with the first bonding portion and the second bonding portion bent in opposite directions relative to the connecting portion. The first bonding portion and the connecting portion form a recess.

Description

Technical Field

[0001] This application relates to the field of energy storage, specifically to an insulating patch, an end cap assembly, a single cell, and an energy storage device. Background Technology

[0002] In related technologies, the end cap assembly includes a top cap and a top patch. The top patch is attached to the surface of the top cap and is a planar film. When the top cap has protrusions, the top patch is difficult to fit tightly to the surface of the top cap, which can easily cause wrinkles or poor adhesion, affecting the insulation effect of the top patch on the top cap. Summary of the Invention

[0003] Therefore, this application provides an insulating patch that is better suited for top covers with protrusions or 3D structures, and can fit better with the top cover to insulate it.

[0004] In a first aspect, embodiments of this application provide an insulating patch, the insulating patch including a top patch, the top patch including a first bonding portion, a connecting portion and a second bonding portion connected in sequence, the connecting portion being disposed around the outer periphery of the first bonding portion, and the second bonding portion being disposed around the outer periphery of the connecting portion; the first bonding portion, the connecting portion and the second bonding portion are bent and connected in sequence, the first bonding portion and the second bonding portion being bent in opposite directions relative to the connecting portion, and the first bonding portion and the connecting portion forming a groove.

[0005] Furthermore, the second bonding portion has a first surface and a second surface disposed opposite to each other along the thickness direction of the top patch, the first surface facing the connecting portion and the first bonding portion, and the second surface facing away from the connecting portion and the first bonding portion; the top patch has a slot, the slot being at least partially located in the second bonding portion, the slot penetrating the first surface and the second surface respectively, and the slot being disposed adjacent to the first bonding portion.

[0006] Furthermore, the slot is also partially located in the connecting portion, which has a third surface and a fourth surface disposed opposite to each other. The third surface is connected to the first surface, and the fourth surface is connected to the second surface. The slot also penetrates the third surface and the fourth surface.

[0007] Furthermore, the second fitting portion also has a side surface, with opposite ends of the side surface respectively connected to the first surface and the second surface, and the slot also extends through the side surface.

[0008] Furthermore, the connecting part includes four connecting sub-parts connected end to end in sequence. The opposite ends of each connecting sub-part are respectively bent and connected to the first fitting part and the second fitting part. The connection between two adjacent connecting sub-parts has an arc-shaped chamfer. The slot is set adjacent to the arc-shaped chamfer.

[0009] Furthermore, the connecting portion has a third surface and a fourth surface disposed opposite to each other, the third surface being connected to the first surface and the fourth surface being connected to the second surface; the connecting line between the first surface and the third surface includes a preset arc, the preset arc being located at the chamfer of the arc, and the radius of curvature of the preset arc being R1; the slot is disposed within a range with the center of the preset arc as the center and a radius of 3R1.

[0010] Furthermore, in a cross-section parallel to the arrangement direction of the first fitting portion, the connecting portion, and the second fitting portion, the connecting portion has an arc-shaped structure, and the surface of the connecting portion away from the sink is a third surface. The third surface has a tangent at the connection point with the first surface, and the angle α between the tangent and the extension surface of the first surface in the direction toward the first fitting portion is in the range of 80°≤α<90°.

[0011] Furthermore, the depth of the sink is Y. On a cross-section parallel to the arrangement direction of the first fitting part, the connecting part and the second fitting part, the connecting part has an arc-shaped structure. The surface of the connecting part facing the sink is a fourth surface. The radius of curvature R2 of the fourth surface is in the range of 0.5Y≤R2≤1.5Y.

[0012] Furthermore, the thickness of both the first and second bonding portions is X, and the thickness L of the connecting portion ranges from 0.6X ≤ L ≤ X.

[0013] Furthermore, the depth of the sink is Y, the top patch has a length direction and a width direction, the length direction dimension w1 of the slot is in the range of 0.5Y≤w1≤3Y, and the width direction dimension w2 of the slot is in the range of w2≥1mm.

[0014] Furthermore, the slot has a sidewall, and the angle β between the sidewall and the side surface is in the range of 80°≤β≤100°; and / or, the shape of the slot is at least one of rectangle, quasi-rectangle, trapezoid, and quasi-trapezoidal.

[0015] Furthermore, the insulating patch also includes an adhesive layer, which is disposed on the surface of the top patch having the groove, and the adhesive layer covers the groove or has an opening at the position corresponding to the groove.

[0016] Secondly, embodiments of this application also provide an end cap assembly, the end cap assembly comprising: Top cover, the top cover including a connected boss portion and a peripheral portion, the peripheral portion being disposed around the outer periphery of the boss portion, the boss portion protruding from the peripheral portion; and The insulating patch described in this application embodiment is attached to the surface of the top cover, and the protrusion is received in the groove of the insulating patch.

[0017] Thirdly, embodiments of this application also provide a single-cell battery, the single-cell battery comprising: A housing having a receiving cavity open at one end; An electrode assembly disposed within the receiving cavity; The end cap assembly described in this application embodiment is used to close the opening of the receiving cavity, and the insulating patch is closer to the outer surface of the single battery cell than the top cover; and An insulating film is wrapped around the surface of the housing.

[0018] Furthermore, the insulating film includes a first insulating portion and a second insulating portion connected together. The first insulating portion wraps around the surface of the housing, and the second insulating portion wraps around a portion of the surface of the top cover facing the insulating patch. The top patch has a slot, and the slot is at least partially located in the second bonding portion. The orthographic projection of the slot onto the surface of the top cover facing the insulating patch falls within the range of the orthographic projection of the second insulating portion onto the surface of the top cover facing the insulating patch.

[0019] Fourthly, embodiments of this application also provide an energy storage device, which includes: one or more single-cell batteries as described in embodiments of this application.

[0020] The insulating patch described in this application embodiment includes a top patch, which comprises a first fitting portion, a connecting portion, and a second fitting portion connected in sequence. The connecting portion is disposed around the outer periphery of the first fitting portion, and the second fitting portion is disposed around the outer periphery of the connecting portion. The first fitting portion, the connecting portion, and the second fitting portion are bent and connected in sequence, with the first fitting portion and the second fitting portion bent in opposite directions relative to the connecting portion. The first fitting portion and the connecting portion form a recessed groove. The recessed groove of the top patch of the insulating patch of this application can be used to accommodate the protrusion portion of the top cover, allowing for better fitting with the end cover assembly with the protrusion on the top cover. This results in a better fit between the insulating patch and the top cover, better matching the structure of the top cover, and better insulation of the top cover. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments 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 these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of an energy storage system according to an embodiment of this application.

[0023] Figure 2 This is a schematic diagram of the power supply system according to an embodiment of this application.

[0024] Figure 3 This is a schematic diagram of the structure of an energy storage device according to an embodiment of this application.

[0025] Figure 4 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application.

[0026] Figure 5 This is a schematic diagram of the exploded structure of a single cell battery according to an embodiment of this application.

[0027] Figure 6 This is a schematic diagram of the structure of an electrode assembly according to an embodiment of this application.

[0028] Figure 7 This is a schematic diagram of the structure of an end cap assembly according to an embodiment of this application.

[0029] Figure 8 This is an exploded view of an end cap assembly according to an embodiment of this application.

[0030] Figure 9 This is a schematic diagram of the structure of an insulating patch according to an embodiment of this application.

[0031] Figure 10 This is a schematic diagram of the planar structure of the top patch according to an embodiment of this application.

[0032] Figure 11 This is a schematic diagram of the top panel structure from one perspective, representing an embodiment of this application.

[0033] Figure 12 As an embodiment of this application, the top edge of the patch Figure 10 A cross-sectional view along the AA direction.

[0034] Figure 13 This is a schematic diagram of the planar structure of the top patch according to another embodiment of this application.

[0035] Figure 14 This is a structural schematic diagram of the top panel of an embodiment of this application from another perspective.

[0036] Figure 15 This is a partial enlarged view of the top panel of an embodiment of this application.

[0037] Figure 16 This is a schematic diagram of the exploded structure of an insulating patch according to an embodiment of this application.

[0038] Figure 17 This is a schematic diagram of the structure of the first insulating film according to an embodiment of this application.

[0039] Figure 18 This is a top view of a single battery cell according to an embodiment of this application.

[0040] Figure 19 The edge of a single cell battery according to an embodiment of this application Figure 18 Cross-sectional view along the BB direction.

[0041] Explanation of reference numerals in the attached figures: 100 - Energy storage system; 110 - High-voltage cable; 120 - First energy conversion device; 130 - Second energy conversion device; 100' - Power supply system; 110' - Electrical equipment; 200 - Energy storage device; 300 - Single cell; 310 - Housing; 311 - Receiving cavity; 320 - Electrode assembly; 321 - Positive electrode; 322 - Separator; 323 - Negative electrode; 340 - First insulating film; 341 - First insulating part; 342 - Second insulating part; 350 - Second insulating film; 40 0-End cap assembly, 410-Top cap, 411-Lead portion, 412-Outer periphery, 500-Insulating patch, 510-Adhesive layer, 600-Top patch, 610-First bonding portion, 620-Connecting portion, 621-Third surface, 622-Fourth surface, 623-Connecting sub-part, 624-Curved chamfer, 625-Preset arc, 630-Second bonding portion, 631-First surface, 632-Second surface, 633-Side surface, 634-Side wall, 640-Groove, 650-Slot. Detailed Implementation

[0042] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0043] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0044] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0045] It should be noted that, for ease of explanation, the same reference numerals denote the same components in the embodiments of this application, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0046] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve energy efficiency, it is necessary to store one form of energy in the same way or by converting it into another, and then release it in a specific energy form based on future application needs. Currently, the main way to generate green electricity is to develop green energy sources such as photovoltaics and wind power to replace fossil fuels.

[0047] Currently, the generation of green electricity generally relies on solar, wind, and hydropower. However, wind and solar power are generally characterized by strong intermittency and large fluctuations, which can cause grid instability, insufficient power during peak demand periods, and excessive power during off-peak periods. Unstable voltage can also damage the power grid. Therefore, insufficient electricity demand or insufficient grid capacity may lead to the problem of "wind and solar curtailment." Solving these problems requires energy storage. This involves converting electrical energy into other forms of energy through physical or chemical means and storing it. When needed, this energy can be converted back into electrical energy and released. Simply put, energy storage is like a large "power bank," storing electrical energy when solar and wind power are abundant and releasing the stored electricity when needed.

[0048] Taking electrochemical energy storage as an example, this solution provides an energy storage device for use in energy storage systems. The energy storage device is equipped with a set of chemical batteries, which mainly use the chemical elements in the batteries as energy storage media. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage media. Simply put, the electrical energy generated by wind and solar energy is stored in the chemical batteries. When the use of external electrical energy reaches its peak, the stored electricity is released for use, or transferred to places with a shortage of electricity for use.

[0049] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, and consumption-side energy storage. The corresponding types of energy storage devices include: (1) Large-scale energy storage power stations (including multiple prefabricated energy storage modules) applied to wind power and photovoltaic power stations can help renewable energy power generation meet grid connection requirements and improve the utilization rate of renewable energy. As a high-quality active / reactive power regulation power source on the power supply side, energy storage power stations can achieve load matching of power in time and space, enhance the renewable energy absorption capacity, reduce instantaneous power changes, reduce the impact on the power grid, improve the absorption of new energy power generation, and are of great significance in power grid system backup, alleviating peak load power supply pressure and peak regulation and frequency regulation. (2) The energy storage prefabricated cabin applied on the grid side mainly functions as peak regulation, frequency regulation and grid congestion relief. In terms of peak regulation, it can realize peak shaving and valley filling of electricity load, that is, charging the energy storage battery when the electricity load is low and releasing the stored electricity during the peak electricity load period, thereby achieving a balance between power production and consumption. (3) Small energy storage cabinets applied to the electricity consumption side mainly function as self-consumption of electricity, peak-valley price arbitrage, capacity cost management, and improvement of power supply reliability. Depending on the application scenario, electricity consumption side energy storage can be divided into industrial and commercial energy storage cabinets, household energy storage devices, energy storage charging piles, etc., which are generally used in conjunction with distributed photovoltaics. Industrial and commercial users can use energy storage for peak-valley price arbitrage and capacity cost management. In the electricity market implementing peak-valley pricing, by charging the energy storage system when the electricity price is low and discharging the energy storage system when the electricity price is high, peak-valley price arbitrage can be achieved, reducing electricity costs. In addition, industrial enterprises subject to two-part tariffs can use energy storage systems to store energy during off-peak hours and discharge during peak loads, thereby reducing peak power and the maximum demand declared, achieving the goal of reducing capacity costs. Household photovoltaics with energy storage can improve the level of self-consumption of electricity. Due to high electricity prices and poor power supply stability, the demand for household photovoltaic installations is driven. Given that photovoltaic power generation occurs during the day, while user load is generally higher at night, configuring energy storage can better utilize photovoltaic power, improve self-consumption levels, and reduce electricity costs. Furthermore, energy storage is needed in areas such as communication base stations and data centers for backup power.

[0050] In some embodiments, see Figure 1 , Figure 1 This is a schematic diagram of the structure of an energy storage system 100 according to an embodiment of this application, and this application Figure 1 The embodiments are illustrated using a shared energy storage scenario on the power generation / distribution side as an example. The energy storage device 200 in this application is not limited to a prefabricated energy storage module in a power generation / distribution energy storage scenario.

[0051] This application provides an energy storage system 100, which includes: a high-voltage cable 110, a first power conversion device 120, a second power conversion device 130, and an energy storage device 200 provided in this application. In some embodiments of the power generation scenario, the second power conversion device 130 can be a wind power conversion device. Since the electricity generated by wind power conversion is volatile, random, and intermittent, the unstable electricity output by the wind power conversion device can be stored in the energy storage device 200 through grid connection. The energy storage device 200 is connected to the high-voltage cable 110 and outputs smooth electricity to the power consumption side of the distribution network, realizing peak shaving and frequency regulation, and stable grid operation; or, wind power conversion... The power conversion device is always connected to the high-voltage cable 110. Under normal power generation conditions, the power output of the wind power conversion device is supplied to the power consumption side of the distribution network through the high-voltage cable 110. When the current power load is low and the wind power conversion device generates excess power, the excess power is first stored in the energy storage device 200 to reduce wind and solar curtailment rates and improve the problem of new energy power generation consumption. When the power load is high, the power grid issues an instruction to transmit the power stored in the energy storage device 200 together with the high-voltage cable 110 in grid-connected mode to supply power to the power consumption side. This provides the power grid with various services such as peak shaving, frequency regulation, and backup, giving full play to the peak shaving role of the power grid, promoting peak shaving and valley filling, and alleviating the power supply pressure of the power grid.

[0052] In some embodiments on the distribution network side, the first power conversion device 120 can be a photovoltaic panel, and the energy storage device 200 is connected to the high-voltage cable 110 and installed downstream of the high-voltage cable 110 between the user load and the photovoltaic power conversion device. The electrical energy output by the photovoltaic power conversion device is stored in the energy storage device 200, which can respond in a timely manner to act as a backup power source when the power grid / distribution network fails; or, it can provide power supply support to alleviate line congestion when the high-voltage cable 110 transmission line is blocked, and to delay the economic pressure caused by the expansion of the power grid / distribution capacity when the power grid is planned to be expanded.

[0053] Optionally, the first power conversion device 120 may include, but is not limited to, a photovoltaic panel, and the second power conversion device 130 may include, but is not limited to, a wind power conversion device. The first power conversion device 120 and the second power conversion device 130 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, and mechanical energy into electrical energy.

[0054] Optionally, the energy storage device 200 may include, but is not limited to, energy storage applications such as energy storage power stations, hydropower / thermal / wind power generation systems, solar power generation systems, mobile power systems, smart home systems, or temporary power supply systems, and may also be applied in multiple fields such as data centers, military equipment, aerospace, charging piles, and electric vehicles.

[0055] Figure 2This is a schematic diagram of the power supply system 100' according to an embodiment of this application.

[0056] This application embodiment also provides a power supply system 100', which includes an electrical device 110' and an energy storage device 200 or an energy storage system 100 as described in this application embodiment, wherein the energy storage device 200 or the energy storage system 100 is used to supply power to the electrical device 110'.

[0057] Optionally, the electrical equipment 110' can be, but is not limited to, at least one of the following: power grid, base station, household appliances (such as air conditioners, lamps, refrigerators, etc.), commercial charging equipment (such as photovoltaic storage charging stations).

[0058] It should be noted that when the power supply system 100' includes the energy storage system 100, the electrical equipment 110' is electrically connected to the high-voltage cable 110 of the energy storage system.

[0059] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of an energy storage device 200 according to an embodiment of this application.

[0060] Optionally, the energy storage device 200 may include, but is not limited to, one or more individual battery cells 300.

[0061] The term "multiple" refers to two or more, such as, but not limited to, 2, 5, 10, 30, 50, 100, 200, 300, 400, 800, 1000, etc. The number of individual battery cells 300 included in the energy storage device 200 can be determined based on the rated capacity of the individual battery cells 300 and the rated capacity to be achieved by the energy storage device 200.

[0062] It should be noted that when the energy storage device 200 includes a single battery cell 300, the energy storage device 200 can exist in the form of a single battery cell 300. When the energy storage device 200 includes multiple single batteries 300, the multiple single batteries 300 can be stacked, arranged, assembled, and other processes to form battery integrated systems such as battery modules, battery packs, battery clusters, power banks, energy storage cabinets / prefabricated energy storage compartments. In other words, the energy storage device 200 can exist in the form of, but is not limited to, battery integrated systems such as battery modules, battery packs, battery clusters, power banks, energy storage cabinets / prefabricated energy storage compartments. The actual application form of the energy storage device 200 provided in this application embodiment can be, but is not limited to, the listed products, and can also be other application forms. This application embodiment does not strictly limit the application form of the energy storage device 200.

[0063] Optionally, the single cell 300 can be, but is not limited to, at least one of cylindrical, square, prismatic, or other shaped cells.

[0064] Optionally, the single cell 300 can be a rechargeable battery, which refers to a single cell 300 that can be recharged after discharge to activate the active materials and continue to be used. The single cell 300 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 this application does not specifically limit it.

[0065] Figure 4 This is a schematic diagram of the structure of a single cell battery 300 according to an embodiment of this application. Figure 5 This is a schematic diagram of the exploded structure of a single cell battery 300 according to an embodiment of this application.

[0066] Please see Figure 4 and Figure 5 This application also provides a single-cell battery 300, which includes a housing 310, an electrode assembly 320, an end cap assembly 400, and a first insulating film 340 (also known as an insulating blue film). The housing 310 has a receiving cavity 311 with one end open. The electrode assembly 320 is disposed in the receiving cavity 311. The end cap assembly 400 is used to close the opening of the receiving cavity 311. The first insulating film 340 is wrapped around the surface of the housing 310.

[0067] Optionally, the single cell 300 further includes a second insulating film 350 (such as a Mylar film), which wraps around the surface of the electrode assembly 320 and is disposed between the housing 310 and the electrode assembly 320.

[0068] Figure 6 This is a schematic diagram of the structure of an electrode assembly 320 according to an embodiment of this application. Please refer to... Figure 6 Optionally, the electrode assembly 320 includes a positive electrode 321, a separator 322 and a negative electrode 323, with the separator 322 located between the positive electrode 321 and the negative electrode 323.

[0069] Optionally, the housing 310 may be, but is not limited to, an aluminum housing, an aluminum alloy housing, etc.

[0070] In related technologies, the end cap assembly includes a top cap and a top patch. The top patch is attached to the surface of the top cap and is a planar film. When the top cap has protrusions, the top patch is difficult to fit tightly to the surface of the top cap, which can easily cause wrinkles or poor adhesion, affecting the insulation effect of the top patch on the top cap.

[0071] Figure 7 This is a schematic diagram of the structure of an end cap assembly 400 according to an embodiment of this application. Figure 8 This is an exploded view of an end cap assembly 400 according to an embodiment of this application.

[0072] Please see Figure 7 and Figure 8 This application embodiment also provides an end cap assembly 400, which includes a top cover 410 and an insulating patch 500. The insulating patch 500 is disposed on the surface of the top cover 410 away from the housing 310, and is used to insulate the top cover 410.

[0073] It should be noted that the insulating patch 500 is closer to the outer surface of the single battery cell 300 than the top cover 410.

[0074] It should be noted that the top cover 410 and the insulating patch 500 are stacked along the thickness direction of the insulating patch 500.

[0075] Optionally, the top cover 410 is welded to the housing 310.

[0076] In some embodiments, the top cover 410 includes a connected boss portion 411 and a peripheral portion 412, the peripheral portion 412 being disposed around the outer periphery of the boss portion 411, and the boss portion 411 protruding from the peripheral portion 412.

[0077] Understandably, the boss portion 411 protrudes from the peripheral portion 412 in a direction away from the housing 310. The insulating patch 500 is attached to the surface of the top cover 410 having the boss portion 411, that is, the insulating patch 500 is attached to the surface of the top cover 410 away from the housing 310.

[0078] It should be noted that the boss portion 411 and the outer periphery portion 412 are an integral structure; the boss portion 411 and the outer periphery portion 412 are different parts of the same component. The top cover 410 can be manufactured using a one-piece molding process. For example, it can be manufactured from sheet material using a one-piece stamping process.

[0079] In this embodiment, the top cover 410 includes a connected boss portion 411 and a peripheral portion 412. The peripheral portion 412 is disposed around the outer periphery of the boss portion 411 and protrudes from the peripheral portion 412 in a direction away from the housing 310. By providing the boss portion 411, the rigidity and strength of the top cover 410 can be improved without changing the thickness of the top cover 410, making it less prone to deformation. This allows the top cover 410 to be made larger, making it suitable for single-cell batteries 300 with larger capacity.

[0080] Figure 9This is a schematic diagram of the structure of an insulating patch 500 according to an embodiment of this application. Figure 10 This is a schematic diagram of the planar structure of the top patch 600 according to an embodiment of this application. Figure 11 This is a schematic diagram of the top patch 600 from one perspective, representing an embodiment of this application.

[0081] Please see Figures 9 to 11 This application embodiment also provides an insulating patch 500, which includes a top patch 600. The top patch 600 includes a first bonding portion 610, a connecting portion 620, and a second bonding portion 630 connected in sequence. The connecting portion 620 is disposed around the outer periphery of the first bonding portion 610, and the second bonding portion 630 is disposed around the outer periphery of the connecting portion 620. The first bonding portion 610, the connecting portion 620, and the second bonding portion 630 are bent and connected in sequence. The first bonding portion 610 and the second bonding portion 630 are bent in opposite directions relative to the connecting portion 620. The first bonding portion 610 and the connecting portion 620 form a groove 640.

[0082] It should be noted that when the top patch 600 is attached to the top cover 410, the opening of the recess 640 faces the top cover 410 and is used to accommodate the boss portion 411 of the top cover 410. That is, the boss portion 411 is accommodated in the recess 640 of the insulating patch 500.

[0083] It should be noted that the first bonding portion 610, the connecting portion 620, and the second bonding portion 630 are an integral structure, and are different parts of the same component. The top patch 600 can be manufactured using an integral molding process. For example, it can be made from a flat sheet using molding, cold drawing, or other molding processes.

[0084] It should be noted that the connecting part 620 has a ring structure, and the second fitting part 630 has a ring structure. The first fitting part 610, the connecting part 620, and the second fitting part 630 are arranged along the extension plane of the top patch 600.

[0085] It should be noted that the first fitting portion 610 and the connecting portion 620 form a recess 640 facing the top cover 410, and the first fitting portion 610 and the connecting portion 620 form a protrusion protruding from the second fitting portion 630 on the side opposite to the top cover 410. Understandably, the connecting portion 620 is bent relative to the second fitting portion 630 in a direction opposite to the top cover 410.

[0086] Optionally, the top patch 600 is insulating. Optionally, the top patch 600 is a resin sheet, such as a polycarbonate sheet (PC sheet).

[0087] It should be noted that when the insulating patch 500 is attached to the top cover 410, the first attachment part 610 is disposed on the side of the protrusion part 411 away from the housing 310, the connecting part 620 is disposed on the periphery of the protrusion part 411, and the second attachment part 630 is disposed on the side of the peripheral part 412 away from the housing 310.

[0088] The insulating patch 500 of this application embodiment includes a top patch 600, which includes a first bonding portion 610, a connecting portion 620, and a second bonding portion 630 connected in sequence. The connecting portion 620 is disposed around the outer periphery of the first bonding portion 610, and the second bonding portion 630 is disposed around the outer periphery of the connecting portion 620. The first bonding portion 610, the connecting portion 620, and the second bonding portion 630 are bent and connected in sequence. The first bonding portion 610 and the second bonding portion 630 are bent in opposite directions relative to the connecting portion 620. The first bonding portion 610 and the connecting portion 620 form a groove 640. The groove 640 of the top patch 600 of the insulating patch 500 of this application can be used to receive the boss portion 411 of the top cover 410, so that it can better fit the end cover assembly 400 with the boss of the top cover 410, so that the insulating patch 500 and the top cover 410 can fit better, the insulating patch 500 better matches the structure of the top cover 410, and better insulates the top cover 410.

[0089] Figure 12 For an embodiment of this application, the top patch 600 is along Figure 10 A cross-sectional view along the AA direction.

[0090] Please see Figure 10 and Figure 12 In some embodiments, the second bonding portion 630 has a first surface 631 and a second surface 632 disposed opposite to each other along the thickness direction of the top patch 600. The first surface 631 faces the connecting portion 620 and the first bonding portion 610, and the second surface 632 is away from the connecting portion 620 and the first bonding portion 610. The top patch 600 has a slot 650, which is at least partially located in the second bonding portion 630. The slot 650 passes through the first surface 631 and the second surface 632 respectively, and is disposed adjacent to the first bonding portion 610.

[0091] It should be noted that the groove 650 may be entirely located in the second bonding portion 630, or it may be partially located in the second bonding portion 630.

[0092] It should be noted that the first surface 631 and the second surface 632 are arranged along the thickness direction of the top patch 600. The first surface 631 faces away from the top cover 410, and the second surface 632 faces the top cover 410.

[0093] Understandably, the slot 650 extends through the second bonding portion 630 along the thickness direction of the top patch 600.

[0094] Optionally, the number of slots 650 can be one or more. When there are multiple slots 650, the multiple slots 650 can be spaced apart around the outer periphery of the first mating portion 610.

[0095] The top patch 600 is relatively thin. When preparing the top patch 600, it is typically a planar film produced through processes such as stretching and blow molding. However, when a 3D structure like the top patch 600 in this embodiment is required, a groove 640 needs to be formed from a planar film through processes such as molding and cold drawing. During the molding process, the portion corresponding to the connecting part 620 is stretched and deformed. Furthermore, during the molding process of the 3D structure top patch 600, uneven material flow can easily cause significant residual internal stress in the connecting part 620. When the top patch 600 is attached to the top cover 410, the area near the connecting part 620 is prone to warping due to stress release caused by the storage environment (e.g., the high temperature and humidity environment during sea transport). In this embodiment, by providing a slot 650 on the top patch 600, and making the slot 650 at least partially located in the second bonding portion 630, and the slot 650 being provided adjacent to the first bonding portion 610, the top patch 600 can be provided with internal stress release space. This makes it less likely for the top patch 600 to lift up when it is attached to the top cover 410, even in high temperature and high humidity environments. This can better keep the top cover 410 in an insulating state and better protect the top cover 410.

[0096] Please see Figure 12 and Figure 13 In some embodiments, the slot 650 is also partially located in the connecting portion 620, the connecting portion 620 having a third surface 621 and a fourth surface 622 disposed opposite to each other, the third surface 621 being connected to the first surface 631, the fourth surface 622 being connected to the second surface 632, and the slot 650 also penetrating the third surface 621 and the fourth surface 622.

[0097] Understandably, the slot 650 extends from the second fitting portion 630 to the connecting portion 620.

[0098] Understandably, the third surface 621 is away from the settling tank 640, and the fourth surface 622 faces the settling tank 640.

[0099] It should be noted that the third surface 621 is away from the top cover 410, and the fourth surface 622 faces the top cover 410.

[0100] In this embodiment, since the internal stress of the top patch 600 mainly remains in the area of ​​the connecting portion 620, the slot 650 extends from the second bonding portion 630 to the connecting portion 620. This provides better space for releasing the internal stress on the connecting portion 620, and better releases the residual internal stress on the connecting portion 620. This makes it less likely for the top patch 600 to lift up when it is attached to the top cover 410, even in high temperature and high humidity environments. This better keeps the top cover 410 in an insulating state and better protects the top cover 410.

[0101] Please see Figure 10 and Figure 13 In some embodiments, the second fitting portion 630 further has a side surface 633, the opposite ends of which are connected to the first surface 631 and the second surface 632 respectively, and the slot 650 also penetrates the side surface 633.

[0102] It should be noted that in some embodiments, the slot 650 extends through the side surface 633. In other embodiments, the slot 650 may not extend through the side surface 633.

[0103] In this embodiment, the slot 650 also penetrates the side 633 of the second bonding part 630, which can better provide space for the release of internal stress on the connecting part 620, and better release the residual internal stress on the connecting part 620. This makes it less likely for the top patch 600 to lift up when it is attached to the top cover 410, even in high temperature and high humidity environments. This can better keep the top cover 410 in an insulating state and better protect the top cover 410.

[0104] Figure 14 This is a structural schematic diagram of the top patch 600 according to another embodiment of this application.

[0105] Please see Figure 14 In some embodiments, the connecting portion 620 includes four connecting sub-portions 623 connected end to end in sequence. The opposite ends of each connecting sub-portion 623 are bent and connected to the first fitting portion 610 and the second fitting portion 630 respectively. The connection between two adjacent connecting sub-portions 623 has an arc-shaped chamfer 624. The slot 650 is provided adjacent to the arc-shaped chamfer 624.

[0106] Understandably, the four connecting sub-parts 623 are connected end-to-end around the outer periphery of the first fitting part 610. It is also understood that the four connecting sub-parts 623 are connected by bends, with the bends of adjacent connecting sub-parts 623 having arc-shaped chamfers 624.

[0107] The deformation and tensile stress at the location of the connecting portion 620 corresponding to the arc-shaped chamfer 624 are the greatest compared to other parts of the connecting portion 620 (e.g., it has curvature changes in multiple directions, or is bent in multiple directions), resulting in greater residual internal stress. In this embodiment, the slot 650 is located adjacent to the arc-shaped chamfer 624, which provides better space for releasing the internal stress on the connecting portion 620. This makes it less prone to warping when the top patch 600 is attached to the top cover 410, even in high temperature and high humidity environments. This better ensures that the top cover 410 remains in an insulating state and provides better protection for the top cover 410.

[0108] Please see again Figure 13 In some embodiments, the connecting portion 620 has a third surface 621 and a fourth surface 622 disposed opposite to each other. The third surface 621 is connected to the first surface 631, and the fourth surface 622 is connected to the second surface 632. The connecting line between the first surface 631 and the third surface 621 includes a preset arc 625. The preset arc is located at the chamfer 624 of the arc, and the radius of curvature of the preset arc 625 is R1. The slot 650 is disposed with the center of the preset arc 625 as the center and a radius of 3R1 (e.g., ...). Figure 13 Within the area of ​​dashed line I, which overlaps with the second mating part 630 and the connecting part 620.

[0109] Optionally, the slot 650 may be set within, but is not limited to, a radius of 3R1, 2.8R1, 2.5R1, 2.3R1, 2R1, 1.8R1, or 1.5R1, with the arc center of the preset arc 625 as the center.

[0110] The deformation of the connecting portion 620 at the corresponding arc-shaped chamfer 624 is greater than that of other parts of the connecting portion 620 (e.g., it has curvature changes in multiple directions, or is bent in multiple directions), resulting in greater residual internal stress. In this embodiment, the slot 650 is set within a radius of 3R1 centered on the arc center of the preset arc 625. This provides better space for releasing internal stress on the connecting portion 620, making it less prone to warping when the top patch 600 is attached to the top cover 410, even in high temperature and high humidity environments. This better ensures that the top cover 410 remains in an insulating state and provides better protection for the top cover 410.

[0111] Please see again Figure 12 In some embodiments, on a cross-section parallel to the arrangement direction of the first fitting portion 610, the connecting portion 620, and the second fitting portion 630, the connecting portion 620 has an arc-shaped structure, and the surface of the connecting portion 620 facing away from the recess 640 is a third surface 621. The third surface 621 has a cross-section at the connection with the first surface 631 (e.g., Figure 12 (Dash line P), the cross-section and the extension surface of the first surface 631 toward the first mating portion 610 (e.g., ... Figure 12 The range of the angle α between the dashed line Q) is: 80°≤α<90°.

[0112] Understandably, the draft angle between the second mating portion 630 and the connecting portion 620 is in the range of 80° to 90° (excluding 90°).

[0113] Specifically, the angle α between the cut surface and the extension surface of the first surface 631 toward the first mating portion 610 can be, but is not limited to, 80°, 82°, 84°, 85°, 86°, 88°, 89.9°, etc.

[0114] In this embodiment, if the angle α between the cut surface and the extension surface of the first surface 631 toward the first bonding portion 610 is too small, the structure of the top patch 600 will not be three-dimensional, and the first bonding portion 610 and the connecting portion 620 will easily collapse, reducing the appearance of the top patch 600; if the angle α between the cut surface and the extension surface of the first surface 631 toward the first bonding portion 610 is too large, it will increase the difficulty of molding and demolding, and may even make demolding difficult.

[0115] Please see again Figure 12In some embodiments, the depth of the sink 640 is Y. On a cross-section parallel to the arrangement direction of the first fitting part 610, the connecting part 620 and the second fitting part 630, the connecting part 620 has an arc-shaped structure. The surface of the connecting part 620 facing the sink 640 is a fourth surface 622. The radius of curvature R2 of the fourth surface 622 is in the range of 0.5Y≤R2≤1.5Y.

[0116] It should be noted that the depth of the sink 640 refers to the depth of the sink 640 along the thickness direction of the top patch 600.

[0117] Specifically, the radius of curvature R2 of the fourth surface 622 can be, but is not limited to, 0.5Y, 0.6Y, 0.7Y, 0.8Y, 0.9Y, 1.0Y, 1.1Y, 1.2Y, 1.3Y, 1.4Y, 1.5Y, etc.

[0118] In a specific example, Y = 2.6 mm, then the radius of curvature R2 of the fourth surface 622 is in the range of 1.3 mm ≤ R2 ≤ 3.9 mm. For example, R2 can be, but is not limited to, 1.3 mm, 1.5 mm, 1.8 mm, 2.0 mm, 2.3 mm, 2.5 mm, 2.8 mm, 3.0 mm, 3.3 mm, 3.5 mm, 3.8 mm, 3.9 mm, etc.

[0119] In this embodiment, if the radius of curvature R2 of the fourth surface 622 is too small, the top patch 600 is easily damaged during preparation, reducing the yield of the top patch 600; if the radius of curvature R2 of the fourth surface 622 is too large, the thickness of the connecting part 620 is difficult to guarantee, which may result in the connecting part 620 being too thin, reducing the insulation effect of the connecting part 620.

[0120] Please see again Figure 12 In some embodiments, the thickness of the first bonding portion 610 and the second bonding portion 630 is both X, and the thickness L of the connecting portion 620 is in the range of 0.6X≤L≤X.

[0121] Here is a specific example: the thickness of both the first bonding portion 610 and the second bonding portion 630 is 0.25mm. Then, the thickness L of the connecting portion 620 is in the range of 0.15mm≤L≤0.25mm. Specifically, the thickness L of the connecting portion 620 can be, but is not limited to, 0.15mm, 0.18mm, 0.20mm, 0.123mm, 0.25mm, etc.

[0122] Specifically, the thickness L of the connecting part 620 can be, but is not limited to, 0.6X, 0.7X, 0.7X, 0.8X, 0.9X, X, etc.

[0123] In this embodiment, if the thickness L of the connecting portion 620 is too thin, the insulation effect of the connecting portion 620 is reduced; if the thickness L of the connecting portion 620 is too thick, the thickness of the connecting portion 620 exceeds the thickness of the first bonding portion 610 and the second bonding portion 630, which increases the manufacturing difficulty of the top patch 600 and affects the appearance of the top patch 600.

[0124] Please see again Figure 12 and Figure 13 In some embodiments, the depth of the sink 640 is Y, the top patch 600 has a length direction and a width direction, and the length dimension w1 of the slot 650 is in the range of 0.5Y≤w1≤3Y.

[0125] Understandably, the length, width, and thickness directions of the top patch 600 intersect each other. In a specific example, the length, width, and thickness directions of the top patch 600 are perpendicular to each other.

[0126] Understandably, the top patch 600 has a larger dimension along its length direction than its width direction, and the top patch 600 has a larger dimension along its width direction than its thickness direction.

[0127] In a specific example, the depth Y of the groove 640 is 2.6mm, then the range of the length dimension w1 of the top patch 600 of the slot 650 is: 1.3mm≤w1≤7.8mm; specifically, the length dimension w1 of the slot 650 can be, but is not limited to, 1.3mm, 1.5mm, 1.8mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm, 6.5mm, 7.0mm, 7.5mm, 7.8mm, etc.

[0128] Specifically, the length dimension w1 of the slot 650 can be, but is not limited to, 0.5Y, 0.6Y, 0.7Y, 0.8Y, 0.9Y, 1.0Y, 1.1Y, 1.2Y, 1.3Y, 1.4Y, 1.5Y, 1.8Y, 2.0Y, 2.2Y, 2.4Y, 2.6Y, 2.8Y, 3Y, etc.

[0129] In this embodiment, if the length dimension w1 of the slot 650 is too narrow, when the slot 650 penetrates the first surface 631, the second surface 632, and the side surface 633, the second bonding portions 630 on both sides of the slot 650 will easily bond together when the top patch 600 is attached to the top cover 410, i.e., they will be stacked together, making the insulating patch 500 unevenly bonded, prone to lifting, and reducing the appearance of the insulating patch 500; if the length dimension w1 of the slot 650 is too wide, the exposed portion of the top cover 410 will be too large when the insulating patch 500 is attached to the top cover 410, which may easily cause the insulation of the top cover 410 to fail.

[0130] In some embodiments, the width dimension w2 of the top patch 600 of the slot 650 is in the range of w2 ≥ 1 mm. Specifically, the width dimension w2 of the top patch 600 of the slot 650 can be, but is not limited to, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 10 mm, 12 mm, etc. If the width dimension w2 of the top patch 600 of the slot 650 is too small, the stress release effect of the slot 650 on the connecting portion 620 of the top patch 600 is reduced, which is not conducive to preventing the top patch 600 from warping.

[0131] Figure 15 This is a partial enlarged view of the top patch 600 according to an embodiment of this application.

[0132] Please see Figure 15 In some embodiments, the slot 650 has a sidewall 634, and the angle β between the sidewall 634 and the side surface 633 is in the range of 80°≤β≤100°.

[0133] Specifically, the angle β between the sidewall 634 and the side surface 633 can be, but is not limited to, 80°, 83°, 85°, 88°, 90°, 93°, 95°, 98°, 100°, etc.

[0134] In this embodiment, if the angle β between the sidewall 634 and the side surface 633 is too small, the second mating portions 630 on both sides of the slot 650 are prone to forming sharp corners, which can easily lead to the sharp corners folding over, causing the top patch 600 to easily lift up locally when it is attached to the top cover 410. If the angle β between the sidewall 634 and the side surface 633 is too large, the opening of the slot 650 near the end of the second mating portion 630 away from the connecting portion 620 is too large, or the size of the slot 650 is too small. If the opening of the slot 650 near the end of the second mating portion 630 away from the connecting portion 620 is too large, the top cover 410 is easily exposed, reducing the insulation effect of the insulating patch 500. If the size of the slot 650 is too small, the stress release effect of the slot 650 on the connecting portion 620 of the top patch 600 is reduced, which is not conducive to reducing the lifting of the top patch 600.

[0135] In some embodiments, the slot 650 is at least one of the following shapes: rectangular, rectangular-like (e.g., a rectangle with chamfered corners, or a rectangle with an arc transition at the corners), trapezoidal, and trapezoidal-like (e.g., a trapezoid with chamfered corners, or a trapezoid with an arc transition at the corners). In other embodiments, the slot 650 may also be other shapes.

[0136] Figure 16 This is an exploded structural diagram of an insulating patch 500 according to an embodiment of this application.

[0137] Please see Figure 16 In some embodiments, the insulating patch 500 further includes an adhesive layer 510 disposed on the surface of the top patch 600 having the groove 640, the adhesive layer 510 covering the groove 650 or the adhesive layer 510 having an opening at a position corresponding to the groove 650 (not shown).

[0138] Understandably, the adhesive layer 510 can be a single, continuous layer; in other words, the slot 650 refers to the position of the top patch 600. In other embodiments, the adhesive layer 510 may also have openings at the positions corresponding to the slots 650; in other words, the slots 650 extend to the position of the adhesive layer 510, that is, the adhesive layer 510 has openings of the same size and shape at the positions corresponding to the slots 650.

[0139] Optionally, the adhesive layer 510 may be, but is not limited to, double-sided adhesive.

[0140] It should be noted that the adhesive layer 510 is disposed between the top patch 600 and the top cover 410, and is used to bond the top patch 600 to the top cover 410.

[0141] In this embodiment, when the adhesive layer 510 does not have an opening, it can better prevent the second bonding portion 630 on both sides of the groove 650 from lifting up; when the adhesive layer 510 is provided in an opening with the same shape and size as the groove 650, the groove 650 and the opening can be formed in the same process, which simplifies the process difficulty of the groove 650.

[0142] Figure 17 This is a schematic diagram of the structure of the first insulating film 340 according to an embodiment of this application. Figure 18 This is a top view of a single-cell battery 300 according to an embodiment of this application. Figure 19 For an embodiment of this application, the edge of the single cell 300 Figure 18 Cross-sectional view along the BB direction.

[0143] Please see Figures 17 to 19 In some embodiments, the first insulating film 340 includes a first insulating portion 341 and a second insulating portion 342 connected together. The first insulating portion 341 wraps around the surface of the housing 310, and the second insulating portion 342 wraps around a portion of the surface of the top cover 410 facing the insulating patch 500. The top patch 600 has a slot 650, which is at least partially located in the second bonding portion 630. The orthographic projection of the slot 650 onto the surface of the top cover 410 facing the insulating patch 500 falls within the range of the orthographic projection of the second insulating portion 342 onto the surface of the top cover 410 facing the insulating patch 500.

[0144] Understandably, the second insulating portion 342 is disposed around the outer periphery of the top cover 410, covering the outer periphery of the surface of the top cover 410 facing the insulating patch 500. It is also understood that the second insulating portion 342 is located between the top cover 410 and the insulating patch 500.

[0145] In this embodiment, the orthographic projection of the slot 650 onto the surface of the top cover 410 facing the insulating patch 500 falls within the range of the orthographic projection of the second insulating portion 342 onto the surface of the top cover 410 facing the insulating patch 500. Thus, the portion of the top cover 410 corresponding to the slot 650 can be insulated by the second insulating portion 342, thereby providing better insulation for the top cover 410 and preventing the slot 650 on the top patch 600 from reducing the insulation effect on the top cover 410.

[0146] In this application, the terms "embodiment" and "implementation" mean that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of these phrases in various locations throughout the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described in this application can be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the various embodiments of this application can be arbitrarily combined to form yet another embodiment that does not depart from the spirit and scope of the technical solution of this application, provided there is no contradiction between them.

[0147] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. An insulating patch, characterized in that, The insulating patch includes a top patch, which includes a first bonding portion, a connecting portion, and a second bonding portion connected in sequence. The connecting portion is disposed around the outer periphery of the first bonding portion, and the second bonding portion is disposed around the outer periphery of the connecting portion. The first bonding portion, the connecting portion, and the second bonding portion are bent and connected in sequence. The first bonding portion and the second bonding portion are bent in opposite directions relative to the connecting portion, and the first bonding portion and the connecting portion form a groove.

2. The insulating patch according to claim 1, characterized in that, The second bonding portion has a first surface and a second surface disposed opposite to each other along the thickness direction of the top patch. The first surface faces the connecting portion and the first bonding portion, and the second surface is away from the connecting portion and the first bonding portion. The top patch has a slot, which is at least partially located in the second bonding portion. The slot passes through the first surface and the second surface respectively, and the slot is disposed adjacent to the first bonding portion.

3. The insulating patch according to claim 2, characterized in that, The slot is also partially located in the connecting portion, which has a third surface and a fourth surface disposed opposite to each other. The third surface is connected to the first surface, and the fourth surface is connected to the second surface. The slot also penetrates the third surface and the fourth surface.

4. The insulating patch according to claim 2, characterized in that, The second fitting portion also has a side surface, with opposite ends of the side surface respectively connected to the first surface and the second surface, and the slot also extends through the side surface.

5. The insulating patch according to claim 2, characterized in that, The connecting part includes four connecting sub-parts connected end to end in sequence. The opposite ends of each connecting sub-part are bent and connected to the first fitting part and the second fitting part, respectively. The connection between two adjacent connecting sub-parts has an arc-shaped chamfer. The slot is set adjacent to the arc-shaped chamfer.

6. The insulating patch according to claim 5, characterized in that, The connecting part has a third surface and a fourth surface arranged opposite to each other. The third surface is connected to the first surface, and the fourth surface is connected to the second surface. The connecting line between the first surface and the third surface includes a preset arc. The preset arc is located at the arc chamfer, and the radius of curvature of the preset arc is R1. The slot is set within a range with the arc center of the preset arc as the center and a radius of 3R1.

7. The insulating patch according to claim 2, characterized in that, In a cross-section parallel to the arrangement direction of the first fitting part, the connecting part and the second fitting part, the connecting part has an arc-shaped structure, and the surface of the connecting part away from the sink is a third surface. The third surface has a tangent at the connection point with the first surface, and the angle α between the tangent and the extension surface of the first surface toward the first fitting part is in the range of 80°≤α<90°.

8. The insulating patch according to claim 1, characterized in that, The depth of the sink is Y. On a cross-section parallel to the arrangement direction of the first fitting part, the connecting part and the second fitting part, the connecting part has an arc-shaped structure. The surface of the connecting part facing the sink is a fourth surface. The radius of curvature R2 of the fourth surface is in the range of 0.5Y≤R2≤1.5Y.

9. The insulating patch of claim 8, wherein, The thickness of both the first and second bonding portions is X, and the thickness L of the connecting portion ranges from 0.6X ≤ L ≤ X.

10. The insulating patch according to any one of claims 2-6, characterized in that, The depth of the groove is Y. The top patch has a length direction and a width direction. The dimension w1 of the groove in the length direction of the top patch is in the range of 0.5Y≤w1≤3Y. The dimension w2 of the groove in the width direction is in the range of w2≥1mm.

11. The insulating patch according to claim 4, characterized in that, The slot has a sidewall, and the angle β between the sidewall and the side surface is in the range of 80°≤β≤100°; and / or, the shape of the slot is at least one of rectangle, rectangular, trapezoidal, and trapezoidal.

12. The insulating patch according to any one of claims 2-6 and 11, characterized in that, The insulating patch further includes an adhesive layer, which is disposed on the surface of the top patch having the groove. The adhesive layer covers the groove or has an opening at the position corresponding to the groove.

13. An end cap assembly, characterized in that, The end cap assembly includes: Top cover, the top cover including a connected boss portion and a peripheral portion, the peripheral portion being disposed around the outer periphery of the boss portion, the boss portion protruding from the peripheral portion; and The insulating patch according to any one of claims 1-12, wherein the insulating patch is adhered to the surface of the top cover, and the protrusion is received within the groove of the insulating patch.

14. A single-cell battery, characterized in that, The single battery cell includes: A housing having a receiving cavity open at one end; An electrode assembly disposed within the receiving cavity; The end cap assembly of claim 13, wherein the end cap assembly is used to close the opening of the receiving cavity, and the insulating patch is closer to the outer surface of the individual battery cell than the top cover; and An insulating film is wrapped around the surface of the housing.

15. The single-cell battery according to claim 14, characterized in that, The insulating film includes a first insulating portion and a second insulating portion connected together. The first insulating portion wraps around the surface of the housing, and the second insulating portion wraps around a portion of the surface of the top cover facing the insulating patch. The top patch has a slot, which is at least partially located in the second bonding portion. The orthographic projection of the slot onto the surface of the top cover facing the insulating patch falls within the range of the orthographic projection of the second insulating portion onto the surface of the top cover facing the insulating patch.

16. An energy storage device, characterized in that, include: One or more single-cell batteries according to any one of claims 14 or 15.

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