Top cover assembly, single battery and energy storage device

Abstract

The application relates to the technical field of batteries, in particular to a top cover assembly, a single battery and an energy storage device. The top cover assembly comprises a cover body, the cover body is provided with a mounting hole penetrating through the cover body; a pole is arranged in the mounting hole; a compression ring is connected with the pole and arranged around the pole; an upper insulating piece is arranged between the cover body and the compression ring, so that the compression ring is insulated from the cover body; the upper insulating piece has a first part located at the radial outside of the compression ring, the first part has a first surface arranged towards the cover body, and the cover body has a second surface arranged towards the first part; at least one of the first surface and the second surface is provided with a liquid blocking structure surrounding the upper insulating piece, and the liquid blocking structure is used for preventing liquid from penetrating into the assembly gap between the upper insulating piece and the cover body. The application can reduce the risk of short circuit of the single battery provided with the top cover assembly.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a top cover assembly, a single battery cell, and an energy storage device. Background Technology

[0002] A power battery is a battery that provides power to tools, such as electric vehicles, electric trains, and electric bicycles. A power battery includes a cover assembly, which comprises a cover, terminals, a pressure ring, and an upper insulating component. During installation, the terminals are inserted through the cover and the upper insulating component on the cover, and then the pressure ring is used to press the terminals firmly to facilitate subsequent welding of the terminals to the adapter plates.

[0003] The related technology uses an upper insulating component to insulate the pressure ring from the cover, thus preventing battery short circuits. However, in practice, battery short circuits still occur. Summary of the Invention

[0004] This application discloses a top cover assembly, a single battery cell, and an energy storage device, which can reduce the risk of short circuits in the single battery cell of the top cover assembly using this application.

[0005] To achieve the above objectives, in a first aspect, embodiments of this application disclose a top cover assembly, comprising:

[0006] The cover body has a through mounting hole;

[0007] The pole post passes through the mounting hole;

[0008] A pressure ring is connected to the pole post and is disposed around the pole post;

[0009] An upper insulating member, at least a portion of which is disposed between the cover and the pressure ring to insulate the pressure ring from the cover;

[0010] The upper insulating member has a first portion located radially outside the pressure ring, the first portion having a first surface disposed toward the cover body, and the cover body having a second surface disposed toward the first portion;

[0011] At least one of the first surface and the second surface is formed with a liquid-blocking structure surrounding the upper insulating member, the liquid-blocking structure being used to prevent liquid from penetrating into the assembly gap between the upper insulating member and the cover.

[0012] In one optional embodiment, the cover has a first plate surface distributed along its own thickness direction, the first plate surface having a groove, and the upper insulating member being accommodated in the groove;

[0013] The liquid-blocking structure is provided on at least one of the outer peripheral surface of the upper insulating member and the surface of the upper insulating member facing the bottom wall of the groove; and / or, the liquid-blocking structure is provided on at least one of the inner peripheral wall of the groove and the bottom wall of the groove.

[0014] In one optional embodiment, the surface of the upper insulating member facing away from the bottom wall of the groove is provided with a receiving groove, and the pressure ring is located in the receiving groove. When the outer peripheral surface of the upper insulating member is provided with the liquid-blocking structure, the surface of the pressure ring facing the bottom wall of the receiving groove extends beyond the first plate surface in the direction from the bottom wall of the receiving groove to the groove opening.

[0015] In one optional embodiment, the upper insulating member includes a base plate portion and a side portion, the first portion being the side portion, the side portion being disposed around the base plate portion, the side portion and the base plate portion cooperating to form a receiving groove, and the pressure ring being located within the receiving groove;

[0016] When the liquid-blocking structure is provided on the outer peripheral surface of the upper insulating member, the thickness of the side portion is greater than the thickness of the bottom plate portion; or, when the liquid-blocking structure is provided on the outer peripheral surface of the upper insulating member, the thickness of the side portion is equal to the thickness of the bottom plate portion, and the liquid-blocking structure protrudes from the outer peripheral surface of the upper insulating member.

[0017] In one optional embodiment, the first surface is the portion of the outer peripheral surface of the upper insulating member facing the groove, the second surface is the inner peripheral wall of the groove, and the liquid-blocking structure includes a plurality of annular grooves, which are spaced apart along the thickness direction of the cover.

[0018] In one alternative embodiment, at least a portion of the first surface is in contact with the second surface.

[0019] In one alternative embodiment, the liquid-blocking structure is formed on one of the first surface and the second surface, and an annular protrusion is formed between two adjacent annular grooves of the liquid-blocking structure, the annular protrusion contacting the other of the first surface and the second surface.

[0020] In an optional embodiment, the first surface is provided with the liquid-blocking structure, and the plurality of annular grooves on the first surface include a first annular groove, the opening of the first annular groove facing the second surface, and the edge of the opening of the first annular groove near the first plate surface being parallel to and in contact with the groove edge at the opening of the groove.

[0021] In an optional embodiment, the first surface is provided with the liquid-blocking structure, and the outer peripheral surface of the upper insulating member is provided with a second annular groove extending in its own circumferential direction. The second annular groove is located on the side of the liquid-blocking structure opposite to the bottom wall of the groove.

[0022] From the bottom wall of the groove towards the opening, the opening of the second annular groove has a first edge and a second edge distributed sequentially, and the first plate surface extends beyond or is flush with the first edge, and the second edge extends beyond the first plate surface.

[0023] In an optional embodiment, the liquid-blocking structure is provided on the second surface, and the edge of the opening of one of the annular grooves on the second surface is in contact with the first plate surface.

[0024] In one optional embodiment, the annular groove has a V-shaped cross-section, with the opening of the annular groove on one of the first surface and the second surface facing the other, and the edges of the openings of two adjacent annular grooves touching.

[0025] Secondly, embodiments of this application also disclose a single battery cell, including the top cover assembly described in any of the above embodiments.

[0026] Thirdly, embodiments of this application also disclose an energy storage device, including the aforementioned single-cell battery.

[0027] Compared with related technologies, the beneficial effects of this application are:

[0028] In this application, at least a portion of the upper insulating member is located between the cover and the pressure ring to insulate the pressure ring and the cover. The upper insulating member has a first portion located radially outside the pressure ring. The first portion has a first surface facing the cover. The cover has a second surface facing the first portion. At least one of the first surface and the second surface forms a liquid-blocking structure that surrounds the upper insulating member. That is, the liquid-blocking structure is located between the upper insulating member and the cover.

[0029] When electrolyte is injected into a single cell of the top cover assembly using the present application, when the electrolyte overflows into the cover and enters the assembly gap between the upper insulator and the cover, the electrolyte will flow to the liquid-blocking structure. The liquid-blocking structure can prevent the electrolyte from continuing to seep into the assembly gap and can extend the flow path of the electrolyte to the part of the upper insulator that corresponds to the pressure ring along the thickness direction of the cover. This prevents the electrolyte from corroding the part of the upper insulator that corresponds to the pressure ring along the thickness direction of the cover, ensuring that the part of the upper insulator that corresponds to the pressure ring along the thickness direction of the cover has a large thickness. The part of the upper insulator that corresponds to the pressure ring along the thickness direction of the cover is the main part that insulates and separates the pressure ring from the cover. Therefore, ensuring that the part of the upper insulator that corresponds to the pressure ring along the thickness direction of the cover has a large thickness can prevent current from breaking through the insulator, thereby reducing the risk of battery short circuit caused by the pressure ring and the cover conducting. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in 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.

[0031] Figure 1 This is a schematic diagram of the energy storage system disclosed in the embodiments of this application;

[0032] Figure 2 This is a schematic diagram of the top cover assembly disclosed in an embodiment of this application;

[0033] Figure 3 This is an exploded view of the top cover assembly disclosed in an embodiment of this application;

[0034] Figure 4 For this application Figure 2 The structure shown is a cross-sectional view along section 1-1;

[0035] Figure 5 For this application Figure 4 Enlarged view of point A in the middle;

[0036] Figure 6 For this application Figure 5 Enlarged view of point A' in the middle;

[0037] Figure 7 This is a partially enlarged cross-sectional view of the top cover assembly disclosed in another embodiment of this application;

[0038] Figure 8 This is a partially enlarged cross-sectional view of the top cover assembly disclosed in another embodiment of this application;

[0039] Figure 9 This is a cross-sectional view of the top cover assembly disclosed in another embodiment of this application;

[0040] Figure 10 For this application Figure 9 Enlarged view of point B in the middle;

[0041] Figure 11 This is a cross-sectional view of the top cover assembly disclosed in other embodiments of this application;

[0042] Figure 12 This is a schematic diagram of the structure of the upper insulating member disclosed in the embodiments of this application;

[0043] Figure 13 For this application Figure 12 Enlarged diagram of point C in the middle.

[0044] Explanation of reference numerals in the attached figures:

[0045] 10. Energy storage system; 11. High-voltage cable; 12. First power conversion device; 13. Second power conversion device; 14. Energy storage device;

[0046] 100. Cover; 101. Mounting hole; 102. Groove; 103. Second surface; 104. Injection hole;

[0047] 200, pole;

[0048] 300, pressure ring;

[0049] 400. Upper insulating component; 401. Receiving groove; 402. Second annular groove; 410. First part; 411. First surface; 420. Base plate part; 430. Flanged part;

[0050] 500, Liquid-blocking structure; 501, Annular protrusion; 510, Annular groove; 511, First annular groove;

[0051] 600. Lower insulation component;

[0052] 700. Sealing components. Detailed Implementation

[0053] 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, and 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.

[0054] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0055] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0056] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0057] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0058] A power battery is a battery that provides power to tools, such as electric vehicles, electric trains, and electric bicycles. A power battery includes a cover assembly, which comprises a cover, terminals, a pressure ring, and an upper insulating component. During installation, the terminals are inserted through the cover and the upper insulating component on the cover, and then the pressure ring is used to press the terminals firmly to facilitate subsequent welding of the terminals to the adapter plates.

[0059] The upper insulating component of the related technology can insulate the pressure ring from the cover, thereby preventing battery short circuits. However, the inventors discovered that during the electrolyte injection process, positive and negative pressure cycles are often used to forcibly inject electrolyte into the cell. After the injection is completed, electrolyte overflow may occur the moment the injection nozzle is removed. The overflowing electrolyte will spread to the upper insulating component and enter the gap between the upper insulating component and the cover, causing the upper insulating component to be slowly corroded and its thickness reduced. This can easily lead to breakdown, that is, the current breaks through the insulating component, causing the pressure ring and the cover to conduct, thus causing a battery short circuit.

[0060] This application discloses a top cover assembly, a battery, and an energy storage device, which can reduce the risk of battery short circuits. The top cover assembly, single battery cell, and energy storage device provided in this application will be described in detail below with reference to the accompanying drawings and specific embodiments and application scenarios.

[0061] 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 for future applications. Currently, the main way to generate green electricity is to develop green energy sources such as photovoltaics and wind power to replace fossil fuels.

[0062] 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.

[0063] For example, regarding electrochemical energy storage, please refer to [link / reference]. Figure 1 This solution provides an energy storage device 14, which is applied to an energy storage system. The energy storage device 14 is equipped with a set of chemical batteries, which mainly use the chemical elements in the batteries as energy storage medium. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage medium. 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 electrical energy is released for use, or transferred to places with a shortage of electricity for use.

[0064] 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 14 include:

[0065] (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 absorption capacity of renewable energy, 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.

[0066] (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.

[0067] (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 charges. 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.

[0068] In some embodiments, please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of an energy storage system 10 according to an embodiment of this application. Figure 1 And this application Figure 1 The embodiments are illustrated using a shared energy storage scenario on the generation / distribution side as an example. The energy storage device in this application is not limited to a prefabricated energy storage module in the generation and distribution energy storage scenario.

[0069] This application provides an energy storage system 10, which includes: a high-voltage cable 11, a first power conversion device 12, a second power conversion device 13, and an energy storage device 14 provided in this application. In some embodiments of the power generation scenario, the second power conversion device 13 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 14 through grid connection. The energy storage device 14 is connected to the high-voltage cable 11 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... The power conversion device is always connected to the high-voltage cable 11. 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. 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 14 to improve the problem of new energy power generation and consumption. When the power load is high, the power grid issues an instruction to transmit the power stored in the energy storage device 14 together with the high-voltage cable 11 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.

[0070] In some embodiments on the distribution network side, the first power conversion device 12 can be a photovoltaic panel, and the energy storage device 14 is connected to the high-voltage cable 11 and installed downstream of the high-voltage cable 11 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 14, 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 blockage when the high-voltage cable 11 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.

[0071] Optionally, the first power conversion device may include, but is not limited to, a photovoltaic panel, and the second power conversion device may include, but is not limited to, a wind power conversion device. The first power conversion device 12 and the second power conversion device 13 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, and mechanical energy into electrical energy.

[0072] Optionally, the energy storage device 14 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.

[0073] Optionally, the energy storage device 14 may include battery modules, battery packs, battery clusters, mobile power supplies, energy storage cabinets / prefabricated energy storage compartments, and other battery integration systems composed of individual batteries. The actual application form of the energy storage device 14 provided in this application embodiment may be, but is not limited to, the listed products, and may also be other application forms. This application embodiment does not strictly limit the application form of the energy storage device 14.

[0074] Alternatively, the single cell is not limited to at least one of cylindrical, square, prismatic, or other shaped cells.

[0075] Optionally, the single cell can be a rechargeable battery, which refers to a single cell that can be recharged after discharge to activate the active materials and continue to be used. The single cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application does not specifically limit it.

[0076] A single battery cell includes a casing, a top cover assembly, and a battery cell. The battery cell can be installed into the casing through an opening in the casing, and the top cover assembly is installed at the opening in the casing.

[0077] Please see Figures 2 to 5 , Figure 12 and Figure 13 The top cover assembly includes a cover body 100, a pole post 200, a pressure ring 300, and an upper insulating member 400. The cover body 100 has a through mounting hole 101. Specifically, the mounting hole 101 extends from one surface of the cover body 100 along its thickness direction to another surface. The pole post 200 passes through the mounting hole 101. The pressure ring 300 is connected to the pole post 200 and is arranged around the pole post 200. At least a portion of the upper insulating member 400 is disposed between the cover body 100 and the pressure ring 300 to insulate and separate the pressure ring 300 from the cover body 100.

[0078] For example, the upper insulating member 400 can be made of plastic, and the pressure ring 300 can be made of aluminum. A through-hole injection hole 104 can be provided on the cover 100, and the external injection nozzle can inject electrolyte into the cell of the single battery after docking with the injection hole 104. The top cover assembly may also include a lower insulating member 600, which is disposed on the surface of the cover 100 opposite to the upper insulating member 400, so as to insulate and separate the lower end of the terminal post 200 from the cover 100.

[0079] For example, the inner edge of the upper insulating member 400 is further formed with a flange 430, which is located inside the mounting hole 101 to prevent the pole post 200 from contacting the inner wall of the mounting hole 101; a sealing member 700 is also provided between the pole post 200 and the mounting hole 101 to seal the gap between them. It should be noted that the upper insulating member 400 may also not include the flange 430, in which case the pole post 200 and the inner wall of the mounting hole 101 can be insulated and separated by the sealing member 700.

[0080] The upper insulating member 400 has a first portion 410 located radially outside the pressure ring 300. The first portion 410 has a first surface 411 disposed toward the cover 100. The cover 100 has a second surface 103 disposed toward the first portion 410. At least one of the first surface 411 and the second surface 103 forms a liquid-blocking structure 500 surrounding the upper insulating member 400. The liquid-blocking structure 500 is used to prevent liquid from penetrating into the assembly gap between the upper insulating member 400 and the cover 100.

[0081] In this application, at least a portion of the upper insulating member 400 is located between the cover 100 and the pressure ring 300 to insulate the pressure ring 300 and the cover 100. The upper insulating member 400 has a first portion 410 located radially outside the pressure ring 300. The first portion 410 has a first surface 411 facing the cover 100. The cover 100 has a second surface 103 facing the first portion 410. At least one of the first surface 411 and the second surface 103 is formed with a liquid-blocking structure 500 surrounding the upper insulating member 400. That is, the liquid-blocking structure 500 is located between the upper insulating member 400 and the cover 100.

[0082] When electrolyte is injected into a single cell of the top cover assembly using the present application, when the electrolyte overflows into the cover 100 and enters the assembly gap between the upper insulating member 400 and the cover 100, the electrolyte will flow to the liquid-blocking structure 500. Compared to the first surface 411 and the second surface 103, which do not have a liquid-blocking structure 500, the liquid-blocking structure 500 provided in the present application can prevent the electrolyte from continuing to seep into the assembly gap and can extend the flow path of the electrolyte to the portion of the upper insulating member 400 along the thickness direction of the cover 100 corresponding to the pressure ring 300, thereby preventing the electrolyte from corroding the upper insulating member 400. The portion of the upper insulating member 400 that corresponds to the pressure ring 300 along the thickness direction of the cover 100 ensures that the portion of the upper insulating member 400 that corresponds to the pressure ring 300 along the thickness direction of the cover 100 has a large thickness. The portion of the upper insulating member 400 that corresponds to the pressure ring 300 along the thickness direction of the cover 100 is the main part that insulates and separates the pressure ring 300 from the cover 100. Therefore, ensuring that the portion of the upper insulating member 400 that corresponds to the pressure ring 300 along the thickness direction of the cover 100 has a large thickness can prevent current from breaking through the insulating member 400, thereby reducing the risk of battery short circuit caused by the pressure ring 300 and the cover 100 becoming conductive.

[0083] Please see Figures 5 to 8 In one optional embodiment, the cover 100 has a first plate surface distributed along its own thickness direction, the first plate surface having a groove 102, and the upper insulating member 400 is accommodated in the groove 102.

[0084] At least one of the outer peripheral surface of the upper insulating member 400 and the surface of the upper insulating member 400 facing the bottom wall of the groove 102 is provided with a liquid-blocking structure 500. In this case, the first surface 411 includes at least a portion of the outer peripheral surface of the upper insulating member 400 and / or the surface of the upper insulating member 400 facing the bottom wall of the groove 102; and / or, at least one of the inner peripheral wall of the groove 102 and the bottom wall of the groove 102 is provided with a liquid-blocking structure 500. In this case, the second surface 103 includes at least a portion of the inner peripheral wall of the groove 102 and / or a portion of the bottom wall of the groove 102.

[0085] In this embodiment, the first plate surface is provided with a groove 102, which can provide installation guidance for the upper insulating member 400. This allows installers to quickly install the upper insulating member 400 to the preset position, shortening installation time. Furthermore, compared to a cover 100 without a groove 102, this embodiment provides a groove 102 on the cover 100 and accommodates the upper insulating member 400 within it. This extends the mating length between the upper insulating member 400 and the cover 100, thereby extending the path of electrolyte flow to the portion of the upper insulating member 400 along the thickness direction of the cover 100 corresponding to the pressure ring 300. A longer path results in greater resistance; therefore, the structure of this embodiment further reduces the risk of electrolyte flow to the portion of the upper insulating member 400 along the thickness direction of the cover 100 corresponding to the pressure ring 300, ensuring a larger thickness in this portion and further reducing the risk of battery short circuits. (For further details, please refer to...) Figure 9 and Figure 10 Alternatively, the first plate surface may not have the groove 102. In this case, the first surface 411 is the surface of the upper insulating member 400 facing the bottom wall of the groove 102. This application does not limit the specific structure of the cover 100.

[0086] Please see Figure 5 In one optional embodiment, the surface of the upper insulating member 400 facing away from the bottom wall of the groove 102 is provided with a receiving groove 401, that is, at least a portion of the upper insulating member 400 along the thickness direction of the cover 100 is located in the receiving groove 401, and the pressure ring 300 is located in the receiving groove 401. When the outer peripheral surface of the upper insulating member 400 is provided with a liquid-blocking structure 500, the surface of the pressure ring 300 facing the bottom wall of the receiving groove 401 extends beyond the first surface in the direction from the bottom wall of the receiving groove 401 to the groove opening.

[0087] In this embodiment, the pressure ring 300 is located within the receiving groove 401 of the upper insulating member 400. That is, the upper insulating member 400 wraps around at least a portion of the pressure ring 300 along the thickness direction of the cover body 100. This not only prevents the electrolyte from contacting the pressure ring 300 after passing over the upper insulating member 400 radially from the first surface, thereby preventing the electrolyte from corroding the pressure ring 300; but also prevents the pressure ring 300 from contacting the cover body 100 radially by wrapping around at least a portion of the pressure ring 300 along the thickness direction of the cover body 100, thus avoiding the pressure ring 300 and the cover body 100 from becoming electrically connected.

[0088] Furthermore, when the outer peripheral surface of the upper insulating member 400 is provided with a liquid-blocking structure 500, the electrolyte entering between the upper insulating member 400 and the cover 100 will have its path extended by the liquid-blocking structure 500, increasing the fluid resistance of the electrolyte, thereby reducing the risk of the electrolyte flowing to the vicinity of the portion of the upper insulating member 400 that is correspondingly provided with the pressure ring 300 along the thickness direction of the cover 100.

[0089] Furthermore, in this embodiment, the surface of the pressure ring 300 facing the bottom wall of the receiving groove 401 extends beyond the first surface from the bottom wall of the receiving groove 401 towards the groove opening. This allows the shortest straight line between the inner peripheral wall of the groove 102 and the pressure ring 300 to extend obliquely. Compared to the surface of the pressure ring 300 facing the bottom wall of the receiving groove 401 being flush with the first plate surface, this embodiment can increase the shortest distance between the inner peripheral wall of the groove 102 and the pressure ring 300. Since the inner peripheral wall of the groove 102 is correspondingly arranged with the liquid-blocking structure 500, therefore... The minimum distance between the liquid-blocking structure 500 and the pressure ring 300 is also increased accordingly. This means the creepage distance between the portion of the upper insulating member 400 with the liquid-blocking structure 500 and the pressure ring 300 is increased. Thus, even if the electrolyte corrodes the portion of the upper insulating member 400 with the liquid-blocking structure 500, there will still be a large creepage distance between this portion and the pressure ring 300, preventing the portion of the upper insulating member 400 with the liquid-blocking structure 500 from being broken down. This reduces the risk of a short circuit in a single cell caused by the pressure ring 300 becoming conductive with the cover 100. (For further information, please refer to...) Figure 9 and Figure 10 The receiving groove 401 may not be provided on the surface of the upper insulating member 400 away from the bottom wall of the groove 102, and this application does not limit this; in addition, when the receiving groove 401 is provided on the surface of the upper insulating member 400 away from the bottom wall of the groove 102, the surface of the pressure ring 300 facing the bottom wall of the receiving groove 401 may be flush with or lower than the surface of the first plate.

[0090] Please see Figure 5 The upper insulating member 400 includes a base plate portion 420 and a side portion. A first portion 410 is the side portion, which surrounds the base plate portion 420. The side portion and the base plate portion 420 cooperate to form a receiving groove 401, and the pressure ring 300 is located within the receiving groove 401. It should be noted that in this embodiment, the base plate portion 420 is the portion of the upper insulating member 400 described above that corresponds to the pressure ring 300 along the thickness direction of the cover 100, and the interface between the side portion and the base plate portion 420 is formed by… Figure 5 The double-dotted line in the image shows this.

[0091] In an optional embodiment, when the outer peripheral surface of the upper insulating member 400 is provided with a liquid-blocking structure 500, the thickness of the side portion (by...) Figure 5 The d1 dimension shown in the figure is greater than the thickness of the base plate portion 420 (as indicated by...). Figure 5 (The d2 dimension is shown in the figure).

[0092] In this embodiment, the thickness of the side portion is greater than the thickness of the bottom plate portion 420. This increases the shortest distance between the inner peripheral wall of the groove 102 and the pressure ring 300. Since the inner peripheral wall of the groove 102 is correspondingly provided with the liquid-blocking structure 500, the shortest distance between the liquid-blocking structure 500 and the pressure ring 300 is also increased accordingly. That is, the creepage distance between the portion of the upper insulating member 400 with the liquid-blocking structure 500 and the pressure ring 300 is increased. Thus, even if the electrolyte corrodes the portion of the upper insulating member 400 with the liquid-blocking structure 500, this portion still has a large creepage distance with the pressure ring 300, preventing the portion of the upper insulating member 400 with the liquid-blocking structure 500 from being punctured, thereby reducing the risk of a short circuit in a single battery cell caused by the connection between the pressure ring 300 and the cover 100. Of course, the thickness of the side portion can also be less than or equal to the thickness of the bottom plate portion 420, and this application does not limit this.

[0093] Please see Figure 11 In one optional embodiment, when the outer peripheral surface of the upper insulating member 400 is provided with a liquid-blocking structure 500, the thickness of the side portion is equal to the thickness of the bottom plate portion 420, and the liquid-blocking structure 500 protrudes from the outer peripheral surface of the upper insulating member 400.

[0094] In this embodiment, since the liquid-blocking structure 500 protrudes from the outer peripheral surface of the upper insulating member 400, the shortest distance between the liquid-blocking structure 500 and the pressure ring 300 can be increased. That is, the creepage distance between the part of the upper insulating member 400 with the liquid-blocking structure 500 and the pressure ring 300 is increased. Thus, even if the electrolyte corrodes the part of the upper insulating member 400 with the liquid-blocking structure 500, there is still a large creepage distance between this part and the pressure ring 300, so as to prevent the part of the upper insulating member 400 with the liquid-blocking structure 500 from being broken down, thereby reducing the risk of short circuit of a single cell caused by the connection between the pressure ring 300 and the cover 100.

[0095] Please see Figure 5 In one optional embodiment, the first surface 411 is the portion of the outer peripheral surface of the upper insulating member 400 facing the groove 102, the second surface 103 is the inner peripheral wall of the groove 102, and the liquid-blocking structure 500 includes a plurality of annular grooves 510, which are spaced apart along the thickness direction of the cover 100.

[0096] In this embodiment, the liquid-blocking structure 500 includes multiple annular grooves 510 distributed along the thickness direction of the cover 100. Each annular groove 510 can change the flow direction and path of the electrolyte. When multiple annular grooves 510 are provided, the liquid-blocking structure 500 can change the flow direction and path of the electrolyte multiple times to increase the flow resistance of the electrolyte and reduce the electrolyte flow to the vicinity of the portion of the upper insulating member 400 corresponding to the pressure ring 300 along the thickness direction of the cover 100. This prevents the electrolyte from corroding the portion of the upper insulating member 400 corresponding to the pressure ring 300 along the thickness direction of the cover 100, and reduces the risk of battery short circuit caused by the pressure ring 300 and the cover 100 becoming conductive. Of course, the liquid-blocking structure 500 may also include only one annular groove 510, and this application does not limit this.

[0097] In other embodiments, the liquid-blocking structure 500 may be an annular protrusion; or, the liquid-blocking structure 500 may be a groove extending in a spiral; or, the liquid-blocking structure 500 may be a protrusion extending in a spiral.

[0098] Please see Figure 5 and Figure 6 In one alternative embodiment, at least a portion of the first surface 411 is in contact with the second surface 103.

[0099] If the first surface 411 and the second surface 103 are not in contact, a gap exists between them. Some electrolyte may not flow through the liquid-blocking structure 500 but instead seep directly into the gap, weakening the effect of the liquid-blocking structure 500. Therefore, this embodiment brings at least a portion of the first surface 411 into contact with the second surface 103, thereby reducing or even eliminating the gap between them and ensuring that the electrolyte can flow through the liquid-blocking structure 500 along a predetermined path, thus extending the path. Of course, a gap may also exist between the first surface 411 and the second surface 103; this application does not limit this.

[0100] Please see Figure 5 and Figure 6 In one optional embodiment, a liquid-blocking structure 500 is formed on one of the first surface 411 and the second surface 103. An annular protrusion 501 is formed between two adjacent annular grooves 510 of the liquid-blocking structure 500, and the annular protrusion 501 is in line contact with the other of the first surface 411 and the second surface 103. It should be noted that when the liquid-blocking structure 500 is provided on the first surface 411, the annular protrusion 501 is in line contact with the second surface 103; when the liquid-blocking structure 500 is provided on the second surface 103, the annular protrusion 501 is in line contact with the first surface 411. For example, the cross-sectional shape of the annular protrusion 501 can be triangular, semi-circular, arc-shaped, irregular, etc., and this application does not limit the cross-sectional shape of the annular protrusion 501.

[0101] In this embodiment, an annular protrusion 501 is formed between two adjacent annular grooves 510. The annular protrusion 501 is in line contact with the first surface 411 or the second surface 103. Line contact can reduce the contact area between the first surface 411 and the second surface 103. In this way, when the upper insulating member 400 is assembled into the groove 102, the obstruction of the second surface 103 to the first surface 411 can be reduced, which facilitates the assembly of the upper insulating member 400 into the groove 102. Of course, the annular protrusion 501 can also be in surface contact with the first surface 411 or the second surface 103. In this case, the cross-sectional shape of the annular protrusion 501 can be trapezoidal or rectangular, which can increase the cross-sectional area of ​​the annular protrusion 501 and increase the structural strength of the annular protrusion 501. This can prevent the annular protrusion 501 from being damaged during the assembly of the upper insulating member 400 and the cover 100.

[0102] Please see Figure 5 In one optional embodiment, the first surface 411 is provided with a liquid-blocking structure 500. A plurality of annular grooves 510 on the first surface 411 include a first annular groove 511. The opening of the first annular groove 511 faces the second surface 103. The edge of the opening of the first annular groove 511 near the first plate surface is parallel to and in contact with the groove edge at the opening of the groove 102. It should be noted that the first annular groove 511 here is the uppermost annular groove 510 among the plurality of annular grooves 510 of the liquid-blocking structure 500.

[0103] When electrolyte is injected into the cell using an external injection nozzle, the overflowing electrolyte flows along the first surface to the edge of the groove at the opening of the groove 102 before entering between the upper insulating member 400 and the groove 102, where it is guided by the liquid-blocking structure 500. In this embodiment, the plurality of annular grooves 510 include a first annular groove 511. The edge of the opening of the first annular groove 511 near the first plate surface is parallel to and in contact with the edge of the groove at the opening of the groove 102. Therefore, the electrolyte is guided by the liquid-blocking structure 500 the instant it flows into the groove 102 through the edge of the groove at the opening of the groove 102, thus extending the flow path of the electrolyte. It is not necessary to wait for the electrolyte to penetrate a certain depth into the groove 102 before being guided by the liquid-blocking structure 500, achieving an immediate path extension effect. Of course, the edge of the annular groove 510 furthest from the bottom wall of the groove 102 among the plurality of annular grooves 510 of the liquid-blocking structure 500 can also be separated from the first plate surface; this application does not limit this.

[0104] Please see Figure 5 In one optional embodiment, the first surface 411 is provided with a liquid-blocking structure 500, and the outer peripheral surface of the upper insulating member 400 is provided with a second annular groove 402 extending along its own circumference. The second annular groove 402 is located on the side of the liquid-blocking structure 500 away from the bottom wall of the groove 102.

[0105] From the bottom wall of the groove 102 toward the opening, the opening of the second annular groove 402 has a first edge and a second edge distributed sequentially, and the first plate surface extends beyond or is flush with the first edge, and the second edge extends beyond the first plate surface.

[0106] In this embodiment, the outer peripheral surface of the upper insulating member 400 is provided with a second annular groove 402, pointing from the bottom wall of the groove 102 toward the groove opening. The first plate surface extends beyond or is flush with the first edge, and the second edge extends beyond the first plate surface. When the electrolyte flows to the groove opening of the groove 102, part of the electrolyte will enter the groove 102 and be extended by the liquid blocking structure 500, and part of the electrolyte will enter the second annular groove 402 at an angle so that the flow direction is changed by the second annular groove 402.

[0107] The electrolyte entering the second annular groove 402 will adhere to the groove wall of the second annular groove 402. The electrolyte adhering to the groove wall of the second annular groove 402 will not enter the groove 102 again, and thus will not seep into the vicinity of the part of the upper insulating member 400 that is corresponding to the pressure ring 300 along the thickness direction of the cover body 100, so as to prevent the electrolyte from corroding the part of the upper insulating member 400 that is corresponding to the pressure ring 300 along the thickness direction of the cover body 100. The other part of the electrolyte entering the second annular groove 402 will flow downward to the liquid blocking structure 500. That is to say, the flow path of this part of the electrolyte will be extended by the second annular groove 402 and the liquid blocking structure 500, that is, the flow path of this part of the electrolyte will be extended twice, so as to further reduce the risk of this part of the electrolyte flowing into the vicinity of the part of the upper insulating member 400 that is corresponding to the pressure ring 300 along the thickness direction of the cover body 100.

[0108] Please see Figure 7 In one optional embodiment, a liquid-blocking structure 500 is provided on the second surface 103, and the edge of the groove of one of the annular grooves 510 on the second surface 103 is in contact with the first plate surface.

[0109] When electrolyte is injected into the cell using an external injection nozzle, the overflowing electrolyte flows along the first plate surface to the edge of the groove 102 before entering the space between the upper insulating member 400 and the groove 102, where it is guided by the liquid-blocking structure 500. In this embodiment, the edge of the opening of one of the annular grooves 510 on the second surface 103 is connected to the first plate surface. Therefore, the electrolyte is guided by the liquid-blocking structure 500 the instant it flows into the groove 102 through the edge of the groove opening, thus extending the flow path of the electrolyte. This eliminates the need to wait for the electrolyte to penetrate a certain depth into the groove 102 before being guided by the liquid-blocking structure 500, achieving an immediate path extension effect. Of course, the edge of the opening of the annular groove 510 furthest from the bottom wall of the groove 102 among the multiple annular grooves 510 on the second surface 103 can also be separated from the first plate surface; this application does not impose any limitations on this.

[0110] In one alternative embodiment, the annular groove 510 has a V-shaped cross-section, with the opening of the annular groove 510 on one of the first surface 411 and the second surface 103 facing the other, and the edges of the openings of two adjacent annular grooves 510 being connected.

[0111] In this embodiment, the cross-sectional shape of the annular groove 510 is V-shaped, and the edges of the groove openings of two adjacent annular grooves 510 are connected. Thus, the annular protrusion 501 formed between two adjacent annular grooves 510 is in line contact with the first surface 411. The line contact can reduce the contact area between the annular protrusion 501 and the first surface 411 or the second surface 103. In this way, when the upper insulating member 400 is assembled into the groove 102, the obstruction of the second surface 103 to the first surface 411 can be reduced, so as to facilitate the assembly of the upper insulating member 400 into the groove 102.

[0112] The foregoing embodiments of this application focus on describing the differences between various embodiments. As long as the different optimization features between embodiments are not contradictory, they can be combined to form better embodiments. For the sake of brevity, these differences will not be elaborated upon here. The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art, under the guidance of this application, can make many modifications without departing from the spirit and scope of the claims, all of which fall within the protection scope of this application.

Claims

1. A top cover assembly, characterized in that, include: A cover (100) having a mounting hole (101) through it; The pole post (200) is inserted through the mounting hole (101); A pressure ring (300) is connected to the pole post (200) and arranged around the pole post (200); An upper insulating member (400) is provided at least a portion therebetween the cover (100) and the pressure ring (300) to insulate the pressure ring (300) from the cover (100); The upper insulating member (400) has a first portion (410) located radially outside the pressure ring (300), the first portion (410) has a first surface (411) disposed toward the cover (100), and the cover (100) has a second surface (103) disposed toward the first portion (410); At least one of the first surface (411) and the second surface (103) is formed with a liquid-blocking structure (500) surrounding the upper insulating member (400), the liquid-blocking structure (500) being used to prevent liquid from penetrating into the assembly gap between the upper insulating member (400) and the cover (100).

2. The top cover assembly according to claim 1, characterized in that, The cover (100) has a first plate surface distributed along its own thickness direction, and the first plate surface is provided with a groove (102), and the upper insulating member (400) is accommodated in the groove (102); The liquid-blocking structure (500) is provided on at least one of the outer peripheral surface of the upper insulating member (400) and the surface of the upper insulating member (400) facing the bottom wall of the groove (102); and / or, the liquid-blocking structure (500) is provided on at least one of the inner peripheral wall of the groove (102) and the bottom wall of the groove (102).

3. The top cover assembly according to claim 2, characterized in that, The upper insulating member (400) has a receiving groove (401) on the surface away from the bottom wall of the groove (102). The pressure ring (300) is located in the receiving groove (401). When the liquid-blocking structure (500) is provided on the outer peripheral surface of the upper insulating member (400), the surface of the pressure ring (300) facing the bottom wall of the receiving groove (401) extends beyond the first plate surface in the direction from the bottom wall of the receiving groove (401) to the groove opening.

4. The top cover assembly according to claim 2, characterized in that, The upper insulating member (400) includes a base plate portion (420) and a side portion, the first portion (410) being the side portion, the side portion being disposed around the base plate portion (420), the side portion and the base plate portion (420) cooperating to form a receiving groove (401), and the pressure ring (300) being located within the receiving groove (401); When the liquid-blocking structure (500) is provided on the outer peripheral surface of the upper insulating member (400), the thickness of the side portion is greater than the thickness of the bottom plate portion (420); or, when the liquid-blocking structure (500) is provided on the outer peripheral surface of the upper insulating member (400), the thickness of the side portion is equal to the thickness of the bottom plate portion (420), and the liquid-blocking structure (500) protrudes from the outer peripheral surface of the upper insulating member (400).

5. The top cover assembly according to claim 2, characterized in that, The first surface (411) is the portion of the outer peripheral surface of the upper insulating member (400) facing the groove (102), the second surface (103) is the inner peripheral wall of the groove (102), and the liquid-blocking structure (500) includes a plurality of annular grooves (510), which are spaced apart along the thickness direction of the cover (100).

6. The top cover assembly according to claim 5, characterized in that, At least a portion of the first surface (411) is in contact with the second surface (103).

7. The top cover assembly according to claim 6, characterized in that, One of the first surface (411) and the second surface (103) is provided with the liquid-blocking structure (500), and an annular protrusion (501) is formed between two adjacent annular grooves (510) of the liquid-blocking structure (500), and the annular protrusion (501) contacts the other of the first surface (411) and the second surface (103).

8. The top cover assembly according to claim 5, characterized in that, The first surface (411) is provided with the liquid-blocking structure (500), and the plurality of annular grooves (510) on the first surface (411) include a first annular groove (511). The groove opening of the first annular groove (511) faces the second surface (103), and the edge of the groove opening of the first annular groove (511) near the first plate surface is parallel to and in contact with the groove edge at the groove opening of the groove (102).

9. The top cover assembly according to claim 5, characterized in that, The first surface (411) is provided with the liquid blocking structure (500), and the outer peripheral surface of the upper insulating member (400) is provided with a second annular groove (402) extending along its own circumferential direction. The second annular groove (402) is located on the side of the liquid blocking structure (500) away from the bottom wall of the groove (102). From the bottom wall of the groove (102) toward the opening, the opening of the second annular groove (402) has a first edge and a second edge distributed sequentially, and the first plate surface extends beyond or is flush with the first edge, and the second edge extends beyond the first plate surface.

10. The top cover assembly according to claim 5, characterized in that, The second surface (103) is provided with the liquid-blocking structure (500), and the edge of the groove of one of the annular grooves (510) on the second surface (103) is in contact with the first plate surface.

11. The top cover assembly according to claim 5, characterized in that, The cross-sectional shape of the annular groove (510) is V-shaped. The opening of the annular groove (510) on one of the first surface (411) and the second surface (103) faces the other, and the edges of the openings of two adjacent annular grooves (510) are connected.

12. A single-cell battery, characterized in that, Includes the top cover assembly as described in any one of claims 1 to 11.

13. An energy storage device, characterized in that, Including the single-cell battery as described in claim 12.

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