End cover mechanism, energy storage device and power utilization system

Abstract

The invention relates to an end cover mechanism, an energy storage device and a power utilization system. The end cover mechanism comprises an end cover and a lower insulation assembly, the lower insulation assembly is arranged on one side of the end cover, the lower insulation assembly comprises an injection molding body and a first supporting piece which are connected, the melting point of the first supporting piece is higher than that of the injection molding body, and the first supporting piece is at least partially embedded in the injection molding body.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, specifically to an end cap mechanism, an energy storage device, and an electrical system. Background Technology

[0002] Secondary batteries (also known as rechargeable batteries or accumulators) have become a major power source for electrical equipment due to their recyclability. As demand continues to increase, higher requirements are being placed on their energy density, reliability, and cost. In secondary batteries, if thermal runaway occurs in the electrode assembly, the rapid gas production from side reactions leads to a sudden increase in internal pressure. Furthermore, under the high temperatures of thermal runaway, the lower plastic material is prone to melting, causing blockage of the original top venting channel and resulting in poor venting. If the pressure cannot be released in time, the secondary battery is prone to explosion, fire, and other accidents. Therefore, there is an urgent need for an end cap mechanism that can maintain support for the electrode assembly even under extreme thermal runaway conditions, thereby improving the safety performance of secondary batteries. Summary of the Invention

[0003] In view of this, this application provides an end cap mechanism, an energy storage device, and an electrical system. The end cap mechanism can still support the electrode assembly under extreme conditions of thermal runaway, so that the energy storage device has better safety performance.

[0004] This application provides an end cap mechanism, the end cap mechanism including: an end cap and a lower insulating component, the lower insulating component being disposed on one side of the end cap, the lower insulating component including a connected injection molded body and a first support member, the melting point of the first support member being higher than the melting point of the injection molded body, and the first support member being at least partially embedded in the injection molded body.

[0005] Further, the injection-molded body includes an injection-molded body and two injection-molded ends. The two injection-molded ends are respectively connected to opposite sides of the injection-molded body along a first direction. The injection-molded ends are connected to the first support member. The first direction is the length direction of the end cap mechanism. The first support member includes a first insert portion and a first support portion. The two first support portions are respectively connected to opposite sides of the first insert portion along a second direction. The first insert portion is at least partially embedded in the injection-molded end. The first support portion is exposed outside the injection-molded end. The surface of the first support portion closest to the end cap abuts against the end cap. The surface of the first support portion away from the end cap protrudes from the surface of the first insert portion away from the end cap. The second direction is the width direction of the end cap mechanism and intersects with the first direction.

[0006] Furthermore, the first embedding part has a first through hole, which penetrates two opposing surfaces of the first embedding part along a third direction, the third direction being the height direction of the end cap mechanism, and the third direction intersecting with the first direction and the second direction respectively; the injection molded end includes an end body and a first connecting post, the end body having a first embedding cavity, the first connecting post being located in the first embedding cavity and its opposite ends along a third direction being connected to the end body respectively; the first embedding part is at least partially inserted through the first embedding cavity, and the first connecting post is inserted through the first through hole.

[0007] Furthermore, the first embedding portion includes a first connecting sub-portion and a first embedding sub-portion. There are two first connecting sub-portions. Along the second direction, the two first connecting sub-portions are respectively connected to the opposite sides of the first embedding sub-portion. The surface of the first embedding sub-portion facing the end cap is recessed into the surface of the first connecting sub-portion facing the end cap. The surface of the first embedding sub-portion away from the end cap protrudes from the surface of the first connecting sub-portion away from the end cap. The first embedding sub-portion is located in the first embedding cavity and has the first through hole.

[0008] Furthermore, the first support portion includes a first sub-part, a second sub-part, and a third sub-part that are bent and connected together. Along the third direction, the first sub-part and the third sub-part are bent toward the side of the second sub-part facing the end cap. The end of the first sub-part away from the second sub-part is connected to the first embedding portion. The end face of the third sub-part away from the second sub-part abuts against the end cap. The surface of the second sub-part away from the end cap protrudes from the surface of the first embedding portion away from the end cap.

[0009] Furthermore, the second sub-part has a vent hole that penetrates two opposite end faces of the second sub-part along a third direction, wherein the third direction is the height direction of the end cap mechanism, and the third direction intersects with the first direction and the second direction respectively.

[0010] Furthermore, the injection molding end includes a first plate sub-part, a second plate sub-part, a third plate sub-part, a fourth plate sub-part, and an extension sub-part. The first plate sub-part, the second plate sub-part, the third plate sub-part, and the fourth plate sub-part are connected end to end in sequence to form the first embedding cavity. The end of the first plate sub-part facing away from the fourth plate sub-part and the end of the second plate sub-part facing away from the third plate sub-part are respectively connected to the injection molding body. The extension sub-part is connected to the end of the fourth plate sub-part facing away from the end cap, and the extension sub-part protrudes from the surface of the second plate sub-part facing away from the end cap.

[0011] Furthermore, the end cap has an explosion-proof hole that penetrates two opposing surfaces of the end cap along a third direction; the end cap mechanism also includes an explosion-proof valve and a second support member, the explosion-proof valve being installed on the end cap and covering the explosion-proof hole, wherein the third direction is the height direction of the end cap mechanism, and the third direction intersects with the first direction and the second direction respectively; the injection molding body has a through hole that penetrates two opposing surfaces of the injection molding body along a third direction, the two opposite ends of the second support member along the second direction are respectively connected to the injection molding body, the orthographic projection of the second support member on the surface of the end cap facing the lower insulating component at least partially overlaps with the orthographic projection of the explosion-proof valve on the surface of the end cap facing the lower insulating component; the melting point of the second support member is higher than the melting point of the injection molding body, and the surface of the second support member facing away from the end cap protrudes from the surface of the injection molding body facing away from the end cap.

[0012] Furthermore, the second support member includes a second embedding portion and a second support portion. There are two second embedding portions, which are respectively connected to opposite sides of the second support portion along a second direction. The two second embedding portions are located on the same side of the second support portion facing the end cap. The second embedding portions are at least partially embedded in the injection molding body. The end face of the second support portion opposite to the end cap protrudes from the end face of the injection molding body opposite to the end cap.

[0013] Further, the second embedding portion includes a second embedding sub-part and a second connecting sub-part that are bent and connected together. The end of the second connecting sub-part opposite to the second embedding sub-part is connected to the second support portion. Along the second direction, the second embedding sub-part and the second support portion are located on opposite sides of the second connecting sub-part. The second support portion includes a plurality of flat sub-parts and at least one bent sub-part. The bent sub-part is located on the side of the flat sub-part facing the end cap. When the number of bent sub-parts is one, the number of flat sub-parts is two. The two flat sub-parts are respectively connected to the bent sub-part along the second direction. On opposite upward sides, each of the flat sub-parts is connected to the second connecting sub-part at one end away from the bent sub-part; when there are multiple flat sub-parts and multiple bent sub-parts, the flat sub-parts and the bent sub-parts are arranged alternately and bent and connected in sequence, two adjacent bent sub-parts are located on the same side of the flat sub-parts connected to them, the number of flat sub-parts is one more than the number of bent sub-parts, and two flat sub-parts are respectively distributed at two opposite ends of the second support part along the second direction, and are bent and connected to the two second connecting sub-parts of the two second embedded parts respectively.

[0014] Furthermore, the second embedding portion has a second through hole, which penetrates two opposing surfaces of the second embedding portion along a third direction; the injection-molded body includes a body portion and a second connecting post, the body portion has a second embedding cavity, the second connecting post is located in the second embedding cavity and its opposite ends along a third direction are respectively connected to the body portion; the second embedding portion is at least partially inserted through the second embedding cavity, and the second connecting post is inserted through the second through hole.

[0015] This application also provides an energy storage device, the energy storage device comprising: a housing, an electrode assembly, and an end cap mechanism, the housing having a receiving cavity; the electrode assembly being located within the receiving cavity; the end cap mechanism being located on one side of the housing, the end cap being connected to the housing to close the receiving cavity; the electrode assembly being electrically connected to the end cap mechanism and insulated from the end cap.

[0016] This application also provides an electrical system, which includes: electrical equipment and an energy storage device provided in this application, wherein the energy storage device is used to supply power to the electrical equipment.

[0017] In this application, when the end cap mechanism is applied to the energy storage device and the energy storage device experiences thermal runaway, the electrode assembly undergoes a side reaction and generates a large amount of gas, causing the electrode assembly to be pushed up towards the side closer to the end cap along the height direction of the end cap mechanism. The lower insulating assembly includes a connected injection molded body and a first support member, and the first support member is at least partially embedded in the injection molded body. The first support member improves the structural strength of the lower insulating assembly, allowing the side of the lower insulating assembly away from the end cap to abut against the electrode assembly, ensuring a gap between the electrode assembly and the end cap, preventing the electrode assembly from directly blocking the explosion-proof valve of the end cap, allowing the end cap mechanism to release pressure and open the valve in time, thus improving the safety performance of the energy storage device. Furthermore, the melting point of the first support member is higher than that of the injection molded body, so when the internal temperature of the energy storage device rises to the point of melting the injection molded body, the first support member can still maintain its structural integrity and remain positioned between the end cap and the electrode assembly. The first support member abuts against the electrode assembly on the side away from the end cover to prevent the electrode assembly from floating upward toward the side closer to the end cover and blocking the explosion-proof valve of the end cover, thus ensuring the pressure relief and valve opening function of the end cover mechanism and improving the safety performance of the energy storage device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the implementation will be briefly introduced below. Obviously, the drawings described below are some implementations of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an energy storage system according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of an energy storage system according to another embodiment of this application; Figure 3 This is a schematic diagram of the structure of an energy storage system according to another embodiment of this application; Figure 4 This is a schematic diagram of the structure of an energy storage device according to an embodiment of this application; Figure 5 This is an exploded structural diagram of an energy storage device according to an embodiment of this application; Figure 6 This is a bottom view of the end cap mechanism according to an embodiment of this application; Figure 7 This is a schematic diagram of the structure of the lower insulation component according to an embodiment of this application; Figure 8 This is an exploded view of the lower insulation component according to an embodiment of this application; Figure 9 This is a schematic diagram of the structure of the first support member according to an embodiment of this application; Figure 10 This is a partial structural schematic diagram of an injection-molded body according to an embodiment of this application; Figure 11 This is a top view of an end cap mechanism according to an embodiment of this application; Figure 12 for Figure 11 Schematic diagram of the cross-sectional structure along the AA direction; Figure 13 This is a schematic diagram of the structure of the second support member according to an embodiment of this application; Figure 14 for Figure 8 Enlarged view of the dashed box in section B; Figure 15 for Figure 11 A partial cross-sectional structural diagram along the CC direction; Figure 16 for Figure 11 A partial cross-sectional structural diagram along the DD direction; Figure 17 This is a schematic diagram of the structure of an electrical system according to an embodiment of this application; Figure 18This is a circuit block diagram of an electrical system according to an embodiment of this application.

[0020] Explanation of reference numerals in the attached figures: 100 - Energy storage system; 110 - First power conversion device; 120 - First user load; 130 - Second user load; 140 - Energy storage device; 141 - Housing; 1411 - Receiving cavity; 142 - Electrode assembly; 150 - High-voltage cable; 160 - Second power conversion device; 170 - Photovoltaic-energy storage-charging station; 180 - Automobile; 200 - End cap mechanism; 210 - End cap; 211 - Explosion-proof hole; 220 - Lower insulation assembly; 230 - Injection molded body; 231 - Injection molded body; 2311 - Through hole; 2312 - Body part; 2314 - Second connecting post; 2315 - Second embedding cavity; 232 - Injection molded end; 2321 - End body; 2322 - First connecting post; 2323 - First embedding cavity; 2324 - First plate sub-part. 2325-Second plate sub-section, 2326-Third plate sub-section, 2327-Fourth plate sub-section, 2328-Extension sub-section, 240-First support member, 241-First embedding part, 2411-First through hole, 2412-First connecting sub-section, 2413-First embedding sub-section, 242-First support part, 2421-First sub-section, 2422-Second sub-section, 2423-Third sub-section, 2424-Ventilation hole, 250-Explosion-proof valve, 260-Second support member, 261-Second embedding part, 2611-Second embedding sub-section, 2612-Second connecting sub-section, 2613-Second through hole, 262-Second support part, 2621-Flat plate sub-section, 2622-Bending sub-section, 300-Electrical system, 310-Electrical equipment. Detailed Implementation

[0021] 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 of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] 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.

[0023] In this document, references to "embodiment" or "implementation" mean that a particular feature, structure, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] Secondary batteries (also known as rechargeable batteries or accumulators) have become a major power source for electrical equipment due to their recyclability. As demand continues to increase, higher requirements are being placed on their energy density, reliability, and cost. In secondary batteries, if thermal runaway occurs in the electrode assembly, the rapid gas production from side reactions leads to a sudden increase in internal pressure. Furthermore, under the high temperatures of thermal runaway, the lower melting point of the lower plastic component makes it prone to melting or deformation, causing blockage of the original top venting channel and hindering venting. If the pressure cannot be released in time, the secondary battery is prone to explosion, fire, and other accidents. Therefore, there is an urgent need for an end cap mechanism that can maintain support for the electrode assembly even under extreme thermal runaway conditions, thereby improving the safety performance of secondary batteries.

[0025] 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. 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.

[0026] Taking electrochemical energy storage as an example, this solution provides an energy storage device 140, which is applied to the energy storage system 100. The energy storage device 140 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.

[0027] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, and consumption-side energy storage. The corresponding energy storage devices (140 types) 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, the energy storage power station can realize the 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 problem of new energy power generation absorption, and is of great significance in power grid system backup, alleviating peak load power supply pressure and peak regulation and frequency regulation.

[0028] (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.

[0029] (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 140, 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 100 when the electricity price is low and discharging the energy storage system 100 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 the energy storage system 100 to store energy during the low electricity consumption period and discharge during the peak load period, thereby reducing peak power and the maximum demand declared, and achieving the goal of reducing capacity electricity 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.

[0030] 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. Figure 1 The embodiments are illustrated using a home energy storage scenario in user-side energy storage as an example. The energy storage device 140 in this application is not limited to an energy storage box in a home energy storage scenario.

[0031] This application provides an energy storage system 100, which includes a first power conversion device 110 (photovoltaic panel), a first user load 120 (household lighting fixtures), a second user load 130 (e.g., household appliances such as air conditioners), and the energy storage device 140 of this application. The energy storage device 140 is a small energy storage box that can be wall-mounted on an outdoor wall. However, the energy storage device 140 is not limited to wall mounting and can also be placed in a user's residence in other ways. Specifically, the photovoltaic panel can convert solar energy into electrical energy during periods of low electricity prices, and the energy storage device 140 is used to store this electrical energy and supply it to lighting fixtures and household appliances during periods of high electricity prices, or to provide power during power outages / power failures.

[0032] Optionally, the first power conversion device 110 may include, but is not limited to, a photovoltaic panel, and the first power conversion device 110 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy and mechanical energy into electrical energy.

[0033] In some embodiments, see Figure 2 , Figure 2This is a schematic diagram of the structure of an energy storage system 100 according to another embodiment of this application, and this application Figure 2 The embodiments are illustrated using a shared energy storage scenario on the generation / distribution side as an example. The energy storage device 140 in this application is not limited to a prefabricated energy storage module in a generation and distribution energy storage scenario.

[0034] This application provides an energy storage system 100, which includes: a high-voltage cable 150, a first power conversion device 110, a second power conversion device 160, and an energy storage device 140 provided in this application. In some embodiments of the power generation scenario, the second power conversion device 160 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 140 through grid connection. The energy storage device 140 is connected to the high-voltage cable and outputs smooth electricity to supply the power consumption side of the distribution network, realizing peak shaving and frequency regulation, and ensuring stable grid operation; or, wind power... The conversion device is always connected to the high-voltage cable. 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 140 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 140 together with the high-voltage cable 150 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.

[0035] In some embodiments on the distribution network side, the first power conversion device 110 can be a photovoltaic panel, and the energy storage device 140 is connected to the high-voltage cable 150 and installed downstream of the high-voltage cable 150 between the user load and the user load. The electrical energy output by the photovoltaic power conversion device is stored in the energy storage device 140, 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 150 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.

[0036] Optionally, the first power conversion device 110 may include, but is not limited to, a wind power conversion device, and the second power conversion device 160 may include, but is not limited to, a photovoltaic panel. The first power conversion device 110 and the second power conversion device 160 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, and mechanical energy into electrical energy.

[0037] In some embodiments, see Figure 3 , Figure 3This is a schematic diagram of the structure of an energy storage system 100 according to another embodiment of this application, and this application Figure 3 The embodiments are illustrated using an industrial and commercial energy storage scenario as an example. The energy storage device 140 of this application is not limited to an energy storage cabinet in an industrial and commercial energy storage scenario.

[0038] This application provides an energy storage system 100, which includes: an energy storage device 140, a high-voltage cable 150, a factory equipped with a first power conversion device 110, a photovoltaic-energy storage-charging station 170 equipped with a second power conversion device 160, and a vehicle 180. In some embodiments of industrial and commercial scenarios, the first power conversion device 110 can be a photovoltaic panel, which converts solar energy into electrical energy and stores it in the energy storage device 140 in the factory. In the event of a power grid failure, the energy storage device 140 provides power to ensure the safe and stable operation of the factory without interruption. Alternatively, when the factory's power load is high, the power grid issues an instruction to transmit the electricity stored in the energy storage device 140 in conjunction with the high-voltage cable 150 in a grid-connected mode to supply the factory with electricity, providing various services such as peak shaving / frequency regulation and backup for the power grid operation. In addition, the second power conversion device 160 can also be a photovoltaic panel, which converts solar energy into electrical energy and stores it in the energy storage device 140 of the photovoltaic-energy storage-charging station 170, directly charging the vehicle 180 through the photovoltaic-energy storage-charging station 170, which is fast and convenient.

[0039] Optionally, the first power conversion device 110 and the second power conversion device 160 may include, but are not limited to, photovoltaic panels. The first power conversion device 110 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy, and mechanical energy into electrical energy.

[0040] Optionally, the energy storage device 140 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.

[0041] Optionally, the energy storage device 140 may include, but is not limited to, single-cell batteries, or battery modules, battery packs, battery clusters, power banks, energy storage cabinets / prefabricated energy storage compartments, and other battery integrated systems composed of single-cell batteries. The actual application form of the energy storage device 140 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 140. This application embodiment only uses a multi-cell battery of the energy storage device 140 as an example for illustration.

[0042] Optionally, the individual battery cells constituting the energy storage device 140 can be, but are not limited to, at least one of cylindrical, prismatic, prismatic, or other shaped batteries.

[0043] Optionally, the energy storage device 140 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.

[0044] Optionally, the energy storage device 140 may include battery modules, battery packs, battery clusters, mobile power supplies, energy storage cabinets / prefabricated energy storage compartments, and other battery integrated systems composed of individual batteries. The actual application form of the energy storage device 140 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 140.

[0045] Alternatively, the single cell is not limited to at least one of cylindrical, square, prismatic, or other shaped cells.

[0046] 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.

[0047] Please see Figures 4 to 7 This application provides an end cap mechanism 200, which includes an end cap 210 and a lower insulation component 220. The lower insulation component 220 is disposed on one side of the end cap 210. The lower insulation component 220 includes a connected injection molded body 230 and a first support member 240. The melting point of the first support member 240 is higher than the melting point of the injection molded body 230. The first support member 240 is at least partially embedded in the injection molded body 230.

[0048] Understandably, the end cap mechanism 200 is applied to the energy storage device 140, which also includes a housing 141 and an electrode assembly 142. The housing 141 has a receiving cavity 1411, and the electrode assembly 142 is located within the receiving cavity 1411. The end cap mechanism 200 is located on one side of the housing 141, and the end cap 210 is connected to the housing 141 to close the receiving cavity 1411. The electrode assembly 142 is electrically connected to the end cap mechanism 200 and is insulated from the end cap 210.

[0049] Understandably, in the energy storage device 140, the end cap 210, the lower insulation component 220 and the electrode component 142 are arranged sequentially along the height direction of the end cap mechanism 200.

[0050] Understandably, since the first support member 240 is at least partially embedded in the injection molded body 230, in some embodiments the first support member 240 is partially embedded in the injection molded body 230 and partially exposed outside the injection molded body 230; in other embodiments the first support member 240 is completely embedded in the injection molded body 230.

[0051] Understandably, the injection molded body 230 is an insulating component, and the injection molded body 230 is insulated from the end cap 210. Specifically, the injection molded body 230 is a plastic component.

[0052] Understandably, the first support member 240 may be a metal part with an insulating surface, and the first support member 240 is insulated from the end cap 210.

[0053] In this embodiment, when the end cap mechanism 200 is applied to the energy storage device 140 and the energy storage device 140 experiences thermal runaway, the electrode assembly 142 undergoes a side reaction and generates a large amount of gas, causing the electrode assembly 142 to be pushed up along the height direction of the end cap mechanism 200 towards the side closer to the end cap 210. The lower insulation assembly 220 includes a connected injection molded body 230 and a first support member 240, and the first support member 240 is at least partially embedded in the injection molded body 230. The first support member 240 improves the structural strength of the lower insulation assembly 220, allowing the side of the lower insulation assembly 220 away from the end cap 210 to abut against the electrode assembly 142, ensuring a gap between the electrode assembly 142 and the end cap 210. This prevents the electrode assembly 142 from directly blocking the explosion-proof valve 250 of the end cap 210, allowing the end cap mechanism 200 to release pressure and open the valve in a timely manner, thus improving the safety performance of the energy storage device 140. Furthermore, since the melting point of the first support member 240 is higher than that of the injection molded body 230, when the internal temperature of the energy storage device 140 rises to the point of melting the injection molded body 230, the first support member 240 can still maintain its structural integrity and remain positioned between the end cap 210 and the electrode assembly 142. The side of the first support member 240 facing away from the end cap 210 abuts against the electrode assembly 142 to prevent the electrode assembly 142 from floating upwards towards the side closer to the end cap 210 and blocking the explosion-proof valve 250 of the end cap 210. This ensures the pressure relief and valve opening function of the end cap mechanism 200 and improves the safety performance of the energy storage device 140.

[0054] Optionally, in some embodiments, the first support member 240 and the injection molded body 230 are integrally formed. Specifically, the first support member 240 is placed in the mold cavity first, then molten material is injected into the mold cavity, and the injection molded body 230 is injection molded on the first support member 240. The first support member 240 and the injection molded body 230 have good bonding strength.

[0055] Understandably, before the injection molded body 230 melts, if the first support member 240 is completely embedded in the injection molded body 230, the first support member 240 can still improve the structural strength of the injection molded body 230. When the injection molded body 230 melts, the first support member 240 is exposed and plays a supporting role for the electrode assembly 142.

[0056] Optionally, if the structural strength of the first support member 240 is greater than that of the injection-molded body 230, then when the first support member 240 is at least partially embedded in the injection-molded body 230, the first support member 240 can improve the structural strength of the injection-molded body 230. When the injection-molded body 230 melts and the first support member 240 is exposed and located between the electrode assembly 142 and the end cap 210, the surface of the first support member 240 facing away from the end cap 210 can effectively abut against the electrode assembly 142, thereby limiting the floating of the electrode assembly 142. The higher structural strength of the first support member 240 can prevent the first support member 240 from breaking and extend its service life.

[0057] Understandably, in this application, the first direction (such as...) Figure 6 The X-direction (as shown in the middle) is the length direction of the end cap mechanism 200, and the second direction (as shown in the middle X-direction) is the length direction of the end cap mechanism 200. Figure 6 The Y-direction (as shown in the middle) is the width direction of the end cap mechanism 200, and the third direction (such as...) Figure 6 The height direction of the end cap mechanism 200 is shown in the Z direction. The first direction, the second direction and the third direction intersect each other in pairs.

[0058] Understandably, the dimension of the end cap mechanism 200 along the first direction is greater than the dimension of the end cap mechanism 200 along the second direction.

[0059] Optionally, in some embodiments, the first direction, the second direction, and the third direction are perpendicular to each other.

[0060] Optionally, in some embodiments, the number of the first support members 240 is at least one. In the terminology of this application, "at least one" means one or more, and can be one or more. "Multiple" means two or more. When the number of the first support members 240 is multiple, the multiple first support members 240 are spaced apart along the first direction.

[0061] Optionally, in some embodiments, there are two first support members 240, and the two first support members 240 are disposed on opposite sides of the injection-molded body 230 along the first direction.

[0062] In this embodiment, the end cap mechanism 200 has a large dimension along the first direction, making the injection molded body 230 prone to collapse along the first direction. The two first support members 240 can improve the structural strength of the injection molded body 230 along the first direction, affecting the assembly performance of the end cap mechanism 200. Furthermore, when the energy storage device 140 is in thermal runaway, the two first support members 240 spaced apart along the first direction can cooperate to provide better support and restraint for the electrode assembly 142, preventing one end of the electrode assembly 142 from tilting towards the end cap 210 and affecting the depressurization of the energy storage device 140.

[0063] Please see also Figure 8 and Figure 9 In some embodiments, the injection-molded body 230 includes an injection-molded body 231 and injection-molded ends 232. There are two injection-molded ends 232, which are respectively connected to opposite sides of the injection-molded body 231 along a first direction. The injection-molded ends 232 are connected to the first support member 240. The first support member 240 includes a first embedding portion 241 and a first support portion 242. There are two first support portions 242, which are respectively connected to opposite sides of the first embedding portion 241 along a second direction. The first embedding portion 241 is at least partially embedded in the injection-molded ends 232. The first support portion 242 is exposed outside the injection-molded ends 232. The surface of the first support portion 242 closest to the end cap 210 abuts against the end cap 210. The surface of the first support portion 242 away from the end cap 210 protrudes from the surface of the first embedding portion 241 away from the end cap 210.

[0064] Understandably, along the first direction, one of the injection end 232, the injection body 231 and the other injection end 232 are connected in sequence, and the two injection ends 232 are respectively used to connect the two first support members 240.

[0065] Understandably, along the second direction, one of the first support portions 242, the first embedding portion 241 and the other first support portion 242 are connected in sequence.

[0066] Understandably, when the first support portion 242 is a block-shaped support structure, the first support portion 242 has a surface facing the end cap 210, and the surface of the first support portion 242 facing the end cap 210 abuts against the end cap 210. Understandably, when the first support portion 242 is an irregularly shaped structure, the first support portion 242 may have multiple surfaces facing the end cap 210, and the surface of the first support portion 242 closest to the end cap 210 abuts against the end cap 210.

[0067] In this embodiment, the injection-molded body 230 includes an injection-molded body 231 and two injection-molded ends 232. The two injection-molded ends 232 are respectively connected to opposite sides of the injection-molded body 231 along a first direction. The injection-molded ends 232 are connected to the first support member 240. Thus, the injection-molded ends 232 and the first support member 240 are arranged in a one-to-one correspondence to avoid local stress concentration causing the first support member 240 to fall off from the injection-molded ends 232. In addition, the first support member 240 and the injection-molded ends 232 form an embedded connection. Compared with the simple overlapping solution of the first support member 240 and the injection-molded ends 232, the injection-molded body 230 and the first support member 240 in this embodiment have better connection strength and anti-separation ability. Before the injection-molded body 230 melts, the injection-molded body 230 can limit the position of the first support member 240 so that the first support member 240 can play the role of supporting the electrode assembly 142. Furthermore, the first support member 240 includes a first embedding portion 241 and a first support portion 242. The first support portion 242 is exposed at the injection end 232. The surface of the first support portion 242 facing the end cap 210 abuts against the end cap 210, and the surface of the first support portion 242 away from the end cap 210 protrudes from the surface of the injection molded body 230 away from the end cap 210. When the electrode assembly 142 in the energy storage device 140 floats toward the end cap 210, the surface of the first support portion 242 closest to the end cap 210 abuts against the end cap 210, and the surface of the first support portion 242 away from the end cap abuts against the electrode assembly 142, so as to rigidly limit and constrain the electrode assembly 142. Furthermore, during the gradual melting of the injection-molded body 230 due to high temperature, the first support 242 always abuts against the end cap 210 and the electrode assembly 142 along the two opposite end faces in the third direction. This prevents the first support 240 from moving freely between the electrode assembly 142 and the end cap 210, so that a certain distance is maintained between the electrode assembly 142 and the end cap 210 to facilitate gas flow. The end cap mechanism 200 can release pressure and open the valve in time, and the energy storage device 140 has good safety performance.

[0068] Please see also Figures 9 to 12In some embodiments, the first embedding portion 241 has a first through hole 2411, which penetrates two opposing surfaces of the first embedding portion 241 along a third direction; the injection-molded end 232 includes an end body 2321 and a first connecting post 2322, the end body 2321 has a first embedding cavity 2323, the first connecting post 2322 is located in the first embedding cavity 2323 and its opposite ends along a third direction are respectively connected to the end body 2321; the first embedding portion 241 is at least partially inserted through the first embedding cavity 2323, and the first connecting post 2322 is inserted through the first through hole 2411.

[0069] Understandably, along the third direction, the first embedding cavity 2323 has a first top wall (not shown) and a first bottom wall (not shown), and the opposite ends of the first connecting post 2322 are respectively connected to the first top wall and the first bottom wall.

[0070] Understandably, the first support portion 242 is located outside the first embedding cavity 2323.

[0071] In the manufacturing process of the end cap mechanism 200 provided in this application embodiment, the first support member 240 is first placed in the mold cavity, and then molten material is injected into the mold cavity. Part of the molten material flows into the first through hole 2411 and forms the first connecting post 2322, while the first embedding part 241 passes through the first embedding cavity 2323. After demolding, the lower insulating component 220 is formed. The lower insulating component 220 in this application embodiment defines the position of the first support member 240 in the three-dimensional space within the injection molded body 230 through the connection of "internal through" and "overall covering". Compared with the connection strength of a single embedding or overlapping, the connection method of this application embodiment can enable the lower insulating component 220 to effectively resist external forces such as tension and shear, and ultimately enable the lower insulating component 220 to have better structural strength. In particular, it can enable the lower insulating component 220 to withstand greater axial force in the third direction, that is, the lower insulating component 220 has better resistance to compression or tension in the third direction. When the end cap mechanism 200 is applied to the energy storage device 140 and the energy storage device 140 experiences thermal runaway, and the electrode assembly 142 floats toward the end cap 210, the lower insulating component 220 can resist the compression of the electrode assembly 142 to limit the position of the electrode assembly 142. Simultaneously, it can prevent the first support member 240 from detaching from the injection end 232 due to excessive pressure from the electrode assembly 142 on the first support portion 242, or prevent the injection end 232 from cracking due to stress concentration, thus extending the service life of the end cap mechanism 200. Furthermore, during the melting process of the injection molded body 230 at high temperature, under the action of the first connecting post 2322, the separation speed of the first support member 240 from the injection molded body 230 is relatively slow. The first connecting post 2322 can limit the position of the first support member 240, preventing the first support member 240 from freely moving between the end cap 210 and the electrode assembly 142. Simultaneously, during the entire process of the injection-molded body 230 melting, the surface of the first support portion 242 closest to the end cap 210 abuts against the end cap 210, and the surface of the first support portion 242 away from the end cap abuts against the electrode assembly 142. The first support portion 242, the first embedded portion 241, and the first connecting post 2322 cooperate with each other so that the first support member 240 has fixed positions at multiple locations along the second direction. This can further reduce the free movement of the first support member 240 between the electrode assembly 142 and the end cap 210, prevent the position of the first support member 240 from shifting, and ensure the supporting effect of the first support member 240 on the electrode assembly 142, thereby improving the safety performance of the energy storage device 140.

[0072] In some embodiments, the first embedding portion 241 includes a first connecting sub-portion 2412 and a first embedding sub-portion 2413. The number of the first connecting sub-portions 2412 is two. Along the second direction, the two first connecting sub-portions 2412 are respectively connected to opposite sides of the first embedding sub-portion 2413. The surface of the first embedding sub-portion 2413 facing the end cap 210 is recessed in the surface of the first connecting sub-portion 2412 facing the end cap 210. The surface of the first embedding sub-portion 2413 away from the end cap 210 protrudes from the surface of the first connecting sub-portion 2412 away from the end cap 210. The first embedding sub-portion 2413 is located in the first embedding cavity 2323. The first embedding sub-portion 2413 has the first through hole 2411.

[0073] Understandably, along the second direction, one first connecting sub-part 2412, one first embedding sub-part 2413, and another first connecting sub-part 2412 are arranged sequentially.

[0074] In this embodiment, the surface of the first embedded portion 2413 facing the end cap 210 is recessed into the surface of the first connecting portion 2412 facing the end cap 210. In other words, the surface of the first embedded portion 241 facing the end cap 210 forms a groove-like structure. During the manufacturing process of the lower insulating assembly 220, the groove can be used to fill molten material so that at least a portion of the injection molded end 232 is located within the groove, and the two adjacent first connecting portions 2412 are limited. Similarly, the surface of the first embedded portion 2413 facing away from the end cap 210 protrudes from the surface of the first connecting portion 2412 facing away from the end cap 210. In other words, the surface of the first embedded portion 241 facing away from the end cap 210 forms a protrusion-like structure. During the manufacturing process of the lower insulating assembly 220, the protrusion is filled with molten material on both sides along the second direction so that both sides of the protrusion along the second direction are covered and limited by at least a portion of the injection molded end 232. Compared to a design where both surfaces of the first embedding portion 241 facing away from each other along the third direction are flat, this embodiment of the application designs the two surfaces of the first embedding sub-part 2413 facing away from each other along the third direction with concave and convex shapes. This allows for a better fit between the first embedding sub-part 2413 and the first embedding cavity 2323. When the first embedding sub-part 2413 is located in the first embedding cavity 2323, the injection molding end 232 can limit the first embedding sub-part 2413 in the first direction, the second direction, and the third direction, thereby improving the connection strength between the first support member 240 and the injection molding end 232. During the melting process of the injection molded body 230 due to high temperature, the speed at which the first support member 240 detaches from the injection molded body 230 can be slowed down, preventing the position of the first support member 240 from shifting. This ensures the supporting effect of the first support member 240 on the electrode assembly 142 and improves the safety performance of the energy storage device 140.

[0075] Understandably, in some embodiments, there is a gap between the surface of the first connecting sub-part 2412 facing the end cap 210 and the surface of the end cap 210 facing the first support member 240. In other words, along the third direction, the first connecting sub-part 2412 and the end cap 210 are spaced apart.

[0076] Understandably, in some other embodiments, the surface of the first connecting part 2412 facing the end cap 210 abuts against the end cap 210. When the surface of the first support part 242 closest to the end cap 210 abuts against the end cap 210, and the surface of the first support part 242 away from the end cap abuts against the electrode assembly 142, both the surface of the first connecting part 2412 facing the end cap 210 and the surface of the first support part 242 closest to the end cap 210 can serve as the abutting surface between the first support member 240 and the end cap 210. This increases the area of ​​the abutting surface, i.e., increases the contact area between the first support member 240 and the end cap 210. This can prevent the first support member 240 from bending due to excessive pressure from the electrode assembly 142 on the first support member 240, thereby improving the support performance of the first support member 240 for the electrode assembly 142.

[0077] In some embodiments, the first support portion 242 includes a first sub-part 2421, a second sub-part 2422, and a third sub-part 2423 that are bent and connected together. Along the third direction, the first sub-part 2421 and the third sub-part 2423 are bent toward the side of the second sub-part 2422 facing the end cap 210. The end of the first sub-part 2421 opposite to the second sub-part 2422 is connected to the first embedding portion 241. The end face of the third sub-part 2423 opposite to the second sub-part 2422 abuts against the end cap 210. The surface of the second sub-part 2422 opposite to the end cap 210 protrudes from the surface of the first embedding portion 241 opposite to the end cap 210.

[0078] Understandably, the first support portion 242 has a "U" shaped structure.

[0079] Understandably, the surface of the first support portion 242 closest to the end cap 210 is the surface of the first sub-part 2421 facing the end cap 210, and / or, the surface of the first support portion 242 closest to the end cap 210 is the surface of the third sub-part 2423 facing the end cap 210.

[0080] In this embodiment, the first support portion 242 includes a first sub-part 2421, a second sub-part 2422, and a third sub-part 2423 that are bent and connected together. The first sub-part 2421, the second sub-part 2422, and the third sub-part 2423 are bent and connected sequentially to form a "U"-shaped structure. Compared to a block-shaped structure, the first support portion 242 in this embodiment is lighter, reducing the weight of the first support member 240 and facilitating a lightweight design of the end cap mechanism 200. Simultaneously, the first support portion 242 has stronger resistance to deformation in the third direction, improving the stability of supporting the electrode assembly 142. Specifically, the end face of the third sub-part 2423 facing away from the second sub-part 2422 abuts against the end cap 210. In other words, the surface of the third sub-part 2423 facing the end cap 210 abuts against the end cap 210. The surface of the second sub-part 2422 facing away from the end cap 210 protrudes from the surface of the injection molded body 230 facing away from the end cap 210, so that when the electrode assembly 142 floats toward the end cap 210, the surface of the second sub-part 2422 facing away from the end cap 210 abuts against the electrode assembly 142. The electrode assembly 142 supports the first support... The compressive force of the support member 240 is transmitted sequentially to the third sub-part 2423 and the end cap 210 through the second sub-part 2422, or sequentially to the first sub-part 2421, the first connecting sub-part 2412 and the end cap 210 through the second sub-part 2422. The end cap 210 can provide rigid support for the first support member 240 so that the first support member 240 can abut against the electrode assembly 142 to prevent the electrode assembly 142 from blocking the pressure relief channel of the end cap mechanism 200. The energy storage device 140 has good safety performance.

[0081] Optionally, the surface of the second sub-part 2422 away from the end cap 210 also protrudes from the surface of the injection body 230 away from the end cap 210. Specifically, the surface of the second sub-part 2422 away from the end cap 210 protrudes from the surface of the injection body 231 away from the end cap 210, and at the same time, the surface of the second sub-part 2422 away from the end cap 210 protrudes from the surface of the injection end 232 away from the end cap 210.

[0082] Understandably, the surface of the first embedded sub-part 2413 facing the end cap 210 is recessed into the surface of the first sub-part 2421 facing the end cap 210, and simultaneously recessed into the surface of the third sub-part 2423 facing the end cap 210. This is so that when the surfaces of the first sub-part 2421 and the third sub-part 2423 abut against the end cap 210, the surface of the first embedded sub-part 2413 facing the end cap 210 can be spaced apart from the end cap 210 and used to set the injection-molded body 231. In some embodiments, the second sub-part 2422 has a vent 2424 that penetrates two opposite end faces of the second sub-part 2422 along a third direction.

[0083] In this embodiment, the second sub-part 2422 has a vent 2424, and the vent 2424 penetrates the two opposite end faces of the second sub-part 2422 along the third direction. This improves the ventilation performance of the first support member 240, increases the exhaust path of gas in the energy storage device 140, which is beneficial to improving the exhaust efficiency of the energy storage device 140, and facilitates the timely pressure relief and valve opening of the end cap mechanism 200, thereby improving the safety performance of the energy storage device 140.

[0084] In some embodiments, the injection molding end 232 includes a first plate sub-part 2324, a second plate sub-part 2325, a third plate sub-part 2326, a fourth plate sub-part 2327, and an extension sub-part 2328. The first plate sub-part 2324, the second plate sub-part 2325, the third plate sub-part 2326, and the fourth plate sub-part 2327 are connected end-to-end in sequence to form the first embedding cavity 2323. The end of the first plate sub-part 2324 away from the fourth plate sub-part 2327 and the end of the second plate sub-part 2325 away from the third plate sub-part 2326 are respectively connected to the injection molding body 231. The extension sub-part 2328 is connected to the end of the fourth plate sub-part 2327 away from the end cap 210, and the extension sub-part 2328 protrudes from the surface of the second plate sub-part 2325 away from the end cap 210.

[0085] Understandably, along the first direction, the second plate sub-part 2325 and the fourth plate sub-part 2327 are arranged facing each other, and the fourth plate sub-part 2327 is arranged further away from the injection body 231 than the second plate sub-part 2325.

[0086] Understandably, along the third direction, the first plate body sub-part 2324 and the third plate body sub-part 2326 are arranged facing each other, and the third plate body sub-part 2326 is arranged further away from the end cap 210 than the first plate body sub-part 2324.

[0087] In this embodiment, the first plate sub-part 2324, the second plate sub-part 2325, the third plate sub-part 2326, and the fourth plate sub-part 2327 are sequentially connected end to end and form the first embedding cavity 2323 to cover the first embedding sub-part 2413 of the first embedding part 241 and limit the first embedding part 241, thereby limiting the injection end 232 to the first support member 240. Furthermore, when the end cap mechanism 200 is applied to the energy storage device 140, the energy storage device 140 also includes an insulating film (not shown in the figure), which covers the outer periphery of the electrode assembly 142 to achieve insulation between the electrode assembly 142 and the housing 141. In this embodiment, the injection molding end 232 further includes an extension sub-part 2328. The extension sub-part 2328 is connected to the end of the fourth plate sub-part 2327 away from the end cap 210. The extension sub-part 2328 protrudes from the surface of the second plate sub-part 2325 away from the end cap 210. The extension sub-part 2328 can be used to connect the insulating film, and makes the insulating film have a larger contact area with the injection molding end 232, so as to further improve the connection strength between the insulating film and the injection molding body 230, prevent the insulating film from falling off the injection molding body 230 and directly exposing the electrode assembly 142, reduce the probability of the electrode assembly 142 directly contacting the housing 141 and causing an internal short circuit in the energy storage device 140, and improve the safety performance of the energy storage device 140.

[0088] Understandably, the insulating film is a Mylar film, the chemical composition of which includes, but is not limited to, polyethylene terephthalate.

[0089] In some embodiments, the end cap 210 has an explosion-proof hole 211, which penetrates two opposing surfaces of the end cap 210 along a third direction; the end cap mechanism 200 further includes an explosion-proof valve 250 and a second support member 260, the explosion-proof valve 250 being mounted on the end cap 210 and covering the explosion-proof hole 211; the injection molding body 231 has a through hole 2311, which penetrates two opposing surfaces of the injection molding body 231 along a third direction, and the second support member 260 along a third direction... The two opposite ends in the second direction are respectively connected to the injection body 231. The orthographic projection of the second support member 260 on the surface of the end cap 210 facing the lower insulating component 220 overlaps at least partially with the orthographic projection of the explosion-proof valve 250 on the surface of the end cap 210 facing the lower insulating component 220. The melting point of the second support member 260 is higher than the melting point of the injection body 230. The surface of the second support member 260 away from the end cap 210 protrudes from the surface of the injection body 230 away from the end cap 210.

[0090] Understandably, the orthographic projection of the second support member 260 onto the surface of the end cap 210 facing the lower insulating component 220 at least partially overlaps with the orthographic projection of the explosion-proof valve 250 onto the surface of the end cap 210 facing the lower insulating component 220. This can be achieved by the second support member 260 and the explosion-proof valve 250 being spaced apart along the third direction, with the second support member 260 corresponding to the explosion-proof valve 250.

[0091] Understandably, the second support member 260 is at least partially embedded in the injection molding body 231 to achieve the connection between the second support member 260 and the injection molding body 231.

[0092] In this embodiment, the second support member 260 is connected to the injection molding body 231 at its opposite ends along the second direction. The orthographic projection of the second support member 260 onto the surface of the end cap 210 facing the lower insulating component 220 at least partially overlaps with the orthographic projection of the explosion-proof valve 250 onto the surface of the end cap 210 facing the lower insulating component 220. Therefore, the second support member 260 is configured corresponding to the explosion-proof valve 250. When the electrode assembly 142 in the energy storage device 140 floats toward the side closer to the end cap 210, the surface of the second support member 260 away from the end cap 210 protrudes from the surface of the injection molding body 230 away from the end cap 210, so that the surface of the second support member 260 away from the end cap 210 abuts against the electrode assembly 142. This creates a certain gap between the explosion-proof valve 250 and the electrode assembly 142, forming an exhaust channel. This facilitates gas impact on the explosion-proof valve 250 and allows the explosion-proof valve 250 to release pressure and open in time, improving the safety performance of the energy storage device 140. Furthermore, since the melting point of the second support member 260 is higher than that of the injection-molded body 230, when the injection-molded body 230 melts due to high temperature, the second support member 260 can still maintain its structural integrity and remain located between the electrode assembly 142 and the end cap 210 to provide a supporting effect on the electrode assembly 142, ensuring the pressure relief function of the end cap mechanism 200. In addition, along the first direction, the first support member 240 and the second support member 260 are spaced apart on the same side of the end cap 210. The first support member 240 and the second support member 260 cooperate with each other so that along the first direction, the lower insulating component 220 has multiple abutment points against the electrode assembly 142, which enhances the supporting effect of the lower insulating component 220 on the electrode assembly 142, ensures the unobstructed venting passage between the end cap 210 and the electrode assembly 142, further ensures the venting and pressure relief function of the end cap mechanism 200, and improves the safety performance of the energy storage device 140.

[0093] Optionally, the structural strength of the second support member 260 is greater than the structural strength of the injection molded body 230.

[0094] Optionally, in some embodiments, when the end cap mechanism 200 includes the first support member 240 and the second support member 260, during the manufacturing process of the end cap mechanism 200, the first support member 240 and the second support member 260 are first placed in the mold cavity, and then molten material is injected into the mold cavity. After demolding, the lower insulating component 220 is formed, that is, the first support member 240, the second support member 260 and the injection molded body 230 are integrally formed structures.

[0095] Optionally, when the end cap mechanism 200 includes the first support member 240 and the second support member 260, the end face of the first support member 240 facing away from the end cap 210 is flush with the end face of the second support member 260 facing away from the end cap 210, so that the first support member 240 and the second support member 260 can cooperate with each other to support the electrode assembly 142.

[0096] Please see also Figures 13 to 16 In some embodiments, the second support member 260 includes a second embedding portion 261 and a second support portion 262. There are two second embedding portions 261, which are respectively connected to opposite sides of the second support portion 262 along a second direction. The two second embedding portions 261 are located on the same side of the second support portion 262 facing the end cap 210. The second embedding portions 261 are at least partially embedded in the injection molding body 231. The end face of the second support portion 262 opposite to the end cap 210 protrudes from the end face of the injection molding body 231 opposite to the end cap 210.

[0097] Understandably, along the second direction, one of the second embedding portions 261, the second support portion 262, and the other second embedding portion 261 are connected in sequence.

[0098] Understandably, the second support portion 262 protrudes from the end face of the end cap 210 and is disposed opposite to the end face of the injection end portion 232.

[0099] In this embodiment, the second support member 260 includes a second embedding portion 261 and a second support portion 262. The second support member 260 is connected to the injection molding body 231 through the second embedding portion 261. Furthermore, the end face of the second support portion 262 facing away from the end cap 210 protrudes from the end face of the injection molding body 231 facing away from the end cap 210. Thus, the second support portion 262 is exposed at the injection molding end 232. When the electrode assembly 142 within the energy storage device 140 floats towards the end cap 210, the surface of the second support portion 262 facing away from the end cap 210 abuts against the electrode assembly 142, thereby rigidly limiting and constraining the electrode assembly 142. Meanwhile, the compressive force exerted by the electrode assembly 142 on the second support member 260 is sequentially transmitted through the second support part 262 to the second embedding part 261, the injection molding body 231, and the end cap 210. The end cap 210 can provide rigid support for the second support part 262, so that the second support member 260 can abut against the electrode assembly 142, thereby preventing the electrode assembly 142 from blocking the pressure relief channel of the end cap mechanism 200. The energy storage device 140 has good safety performance.

[0100] In some embodiments, the second embedding portion 261 includes a second embedding sub-portion 2611 and a second connecting sub-portion 2612 that are bent and connected together. One end of the second connecting sub-portion 2612 that is away from the second embedding sub-portion 2611 is connected to the second support portion 262. Along the second direction, the second embedding sub-portion 2611 and the second support portion 262 are located on opposite sides of the second connecting sub-portion 2612.

[0101] Understandably, the second embedded sub-part 2611 and the second connecting sub-part 2612 form an L-shaped structure.

[0102] In the second support member 260 provided in this embodiment, along the second direction, a second embedding sub-part 2611 of one second embedding part 261, a second support part 262, and a second embedding sub-part 2611 of another second embedding part 261 are arranged sequentially, and each second embedding sub-part 2611 is connected to the second support part 262 through a second connecting sub-part 2612. In this embodiment, by providing the second embedded sub-part 2611, the second support member 260 can be connected to the injection molding body 231; by providing the second connecting sub-part 2612, the second embedded sub-part 2611 and the second support member 262 are located on opposite sides of the second connecting sub-part 2612 along the second direction, and the second embedded sub-part 2611 and the second support member 262 are spaced apart along the third direction, thereby realizing that the surface of the second support member 262 away from the end cap 210 protrudes from the surface of the injection molding body 231 away from the end cap 210, so that the second support member 262 can play a supporting role against the electrode assembly 142, thereby ensuring the pressure relief function of the end cap mechanism 200 and improving the safety performance of the energy storage device 140.

[0103] Furthermore, in some embodiments, the second support portion 262 includes a plurality of flat sub-portions 2621 and at least one bent sub-portion 2622, the bent sub-portion 2622 being located on the side of the flat sub-portion 2621 facing the end cap 210.

[0104] In this embodiment, the second support portion 262 includes a plurality of flat sub-portions 2621 and at least one bent sub-portion 2622. The bent sub-portion 2622 is located on the side of the flat sub-portion 2621 facing the end cap 210. The flat sub-portions 2621 and the bent sub-portion 2622 are connected. On the one hand, the bent sub-portion 2622 increases the degree of bending of the second support portion 262 along the second direction. Compared with the second support portion 262 being configured as a flat structure, the structural design of this embodiment can increase the moment of inertia of the second support portion 262, thereby improving the bending resistance and deformation capacity of the second support portion 262. When the electrode assembly 142 floats upward toward the side closer to the end cap 210, the extrusion force of the electrode assembly 142 on the second support portion 262 is large, which can prevent the second support portion 262 from bending toward the side closer to the end cap 210 and losing its supporting function, thus improving the performance of the end cap mechanism 200. On the other hand, the side of the flat sub-part 2621 facing away from the end cap 210 can serve as a support surface against the electrode assembly 142, thereby abutting the electrode assembly 142. The surface of the bent sub-part 2622 facing the end cap 210 can contact and abut against the end cap 210, so that the force transmitted from the electrode assembly 142 to the flat sub-part 2621 can be further transmitted to the end cap 210, thereby enabling the end cap 210 to provide rigid support for the second support part 262 and ensuring the support performance of the second support member 260 for the electrode assembly 142.

[0105] Furthermore, in some embodiments, when the number of the bending sub-parts 2622 is one, the number of the flat sub-parts 2621 is two, and the two flat sub-parts 2621 are respectively connected to the opposite sides of the bending sub-parts 2622 along the second direction, and the end of each flat sub-part 2621 facing away from the bending sub-parts 2622 is connected to the second connecting sub-part 2612.

[0106] Understandably, along the second direction, one of the flat sub-parts 2621, the bent sub-part 2622, and the other flat sub-part 2621 are bent and connected in sequence.

[0107] In the second support member 260 provided in this embodiment, the second embedding sub-part 2611 of one of the second embedding parts 261, the second connecting sub-part 2612 of one of the second embedding parts 261, the flat sub-part 2621, the bending sub-part 2622 and the other flat sub-part 2621 are bent and connected in sequence. The bending sub-part 2622 improves the bending resistance and deformation capacity of the second support part 262, thereby enabling the second support member 260 to have better support performance for the electrode assembly 142.

[0108] Furthermore, in some other embodiments, when there are multiple flat sub-parts 2621 and multiple bent sub-parts 2622, the flat sub-parts 2621 and the bent sub-parts 2622 are alternately arranged and bent and connected in sequence. Two adjacent bent sub-parts 2622 are located on the same side of the flat sub-parts 2621 connected to them. The number of flat sub-parts 2621 is one more than the number of bent sub-parts 2622. The two flat sub-parts 2621 are respectively distributed at two opposite ends of the second support part 262 along the second direction, and are bent and connected to the two second connecting sub-parts 2612 of the two second embedding parts 261 respectively.

[0109] Understandably, the number of flat sub-parts 2621 is one more than the number of bent sub-parts 2622. For example, when there are two bent sub-parts 2622, the number of flat sub-parts 2621 is three; when there are three bent sub-parts 2622, the number of flat sub-parts 2621 is four.

[0110] Understandably, along the second direction, the two opposite ends of the second support portion 262 are provided with the flat plate sub-portion 2621, and are bent and connected to the second connecting sub-portion 2612 of the second embedding portion 261 through the flat plate sub-portion 2621.

[0111] In this embodiment, there are multiple flat sub-parts 2621 and multiple bent sub-parts 2622, and two adjacent bent sub-parts 2622 are located on the same side of the flat sub-parts 2621 connected to them. That is, the multiple bent sub-parts 2622 are all located on the side of the flat sub-parts 2621 facing the end cap 210. The multiple bent sub-parts 2622 and the multiple flat sub-parts 2621 cooperate with each other, which can not only improve the deformation resistance and bending resistance of the second support part 262, but also increase the abutment area between the second support part 262 and the end cap 210, so that the end cap 210 can provide better rigid support for the second support member 260, so that the second support member 260 can play a supporting role against the electrode assembly 142.

[0112] Preferably, in one specific embodiment, the number of flat sub-parts 2621 is three, the number of bent sub-parts 2622 is two, and along the second direction, the first flat sub-part 2621, the first bent sub-part 2622, the second flat sub-part 2621, the second bent sub-part 2622 and the third flat sub-part 2621 are connected in sequence.

[0113] Optionally, in some embodiments, at least one of the plurality of plate sub-sections 2621 has an exhaust port that penetrates two opposing surfaces of the plate sub-section 2621 along the third direction, so that gas in the energy storage device 140 can flow through the exhaust port to the space between the plate sub-section 2621 and the end cap 210, and impact the explosion-proof valve 250 to open the explosion-proof valve 250 to release pressure, thereby improving the exhaust efficiency of the end cap mechanism 200.

[0114] In some embodiments, the second embedding portion 261 has a second through hole 2613, which penetrates two opposing surfaces of the second embedding portion 261 along a third direction; the injection-molded body 231 includes a body portion 2312 and a second connecting post 2314, the body portion 2312 has a second embedding cavity 2315, the second connecting post 2314 is located in the second embedding cavity 2315 and its opposite ends along a third direction are respectively connected to the body portion 2312; the second embedding portion 261 is at least partially inserted through the second embedding cavity 2315, and the second connecting post 2314 is inserted through the second through hole 2613.

[0115] Understandably, along the third direction, the second embedding cavity 2315 has a second top wall (not shown) and a second bottom wall (not shown), and the opposite ends of the second connecting post 2314 are respectively connected to the second top wall and the second bottom wall.

[0116] Understandably, there are two second embedding cavities 2315, and the two second embedding cavities 2315 are respectively used to set two second embedding parts 261. Along the second direction, the two second embedding cavities 2315 are spaced apart.

[0117] In the manufacturing process of the end cap mechanism 200 provided in this embodiment, the first support member 240 and the second support member 260 are first placed in the mold cavity, and then molten material is injected into the mold cavity. Part of the molten material flows into the first through hole 2411 and forms the first connecting post 2322, and part of the molten material flows into the second through hole 2613 and forms the second connecting post 2314. At the same time, the first embedding part 241 passes through the first embedding cavity 2323, and the second embedding part 261 passes through the second embedding cavity 2315. After demolding, the lower insulating component 220 is formed. The lower insulating component 220 of this application embodiment defines the position of the first support member 240 in the three-dimensional space within the injection molded body 230 through the connection of "internal through" and "overall covering". At the same time, it makes the second support member 260 have a better connection strength with the injection molded body 230, so that the lower insulating component 220 can withstand greater axial force in the third direction. When the end cap mechanism 200 is applied to the energy storage device 140 and the energy storage device 140 experiences thermal runaway, while the electrode assembly 142 floats toward the end cap 210, one of the first support members 240, the second support member 260, and the other first support member 240 are arranged at intervals along the first direction to provide multiple support points along the first direction and resist the compression of the electrode assembly 142, thereby limiting the position of the electrode assembly 142. Simultaneously, this avoids excessive pressure from the electrode assembly 142 on the first support member 242, which could cause the first support member 240 to detach from the injection end 232 or cause the injection end 232 to crack due to stress concentration, thus extending the service life of the end cap mechanism 200.

[0118] Please see also Figures 4 to 16 This application also provides an energy storage device 140, which includes: a housing 141, an electrode assembly 142, and an end cap mechanism 200. The housing 141 has a receiving cavity 1411; the electrode assembly 142 is located within the receiving cavity 1411; the end cap mechanism 200 is located on one side of the housing 141, and the end cap 210 is connected to the housing 141 to close the receiving cavity 1411; the electrode assembly 142 is electrically connected to the end cap mechanism 200 and is insulated from the end cap 210.

[0119] Understandably, the end cap mechanism 200 and the electrode assembly 142 are arranged sequentially along the height direction of the energy storage device 140, that is, along the thickness direction of the end cap mechanism 200.

[0120] In this embodiment, the energy storage device 140 includes the end cap mechanism 200 provided in this application. When the energy storage device 140 experiences thermal runaway, the electrode assembly 142 is pushed up along the third direction towards the side closest to the end cap 210. The lower insulation assembly 220 includes a connected injection-molded body 230 and a first support member 240, and the first support member 240 is at least partially embedded in the injection-molded body 230. The first support member 240 improves the structural strength of the lower insulation assembly 220, allowing the side of the lower insulation assembly 220 away from the end cap 210 to abut against the electrode assembly 142, ensuring a gap between the electrode assembly 142 and the end cap 210. This prevents the electrode assembly 142 from directly blocking the explosion-proof valve 250 of the end cap 210, allowing the end cap mechanism 200 to release pressure and open the valve in a timely manner, thereby improving the safety performance of the energy storage device 140. Furthermore, since the melting point of the first support member 240 is higher than that of the injection molded body 230, when the internal temperature of the energy storage device 140 rises to the point of melting the injection molded body 230, the first support member 240 can still maintain its structural integrity and remain positioned between the end cap 210 and the electrode assembly 142. The side of the first support member 240 facing away from the end cap 210 abuts against the electrode assembly 142 to prevent the electrode assembly 142 from floating upwards towards the side closer to the end cap 210 and blocking the explosion-proof valve 250 of the end cap 210. This ensures the pressure relief and valve opening function of the end cap mechanism 200 and improves the safety performance of the energy storage device 140.

[0121] Understandably, the energy storage device 140 may include, but is not limited to, individual cells, battery modules, battery packs, battery systems, etc.

[0122] Optionally, when the energy storage device 140 is a single battery cell, it can be, but is not limited to, at least one of cylindrical, prismatic, prismatic, or other shaped batteries. The single battery cell can be a rechargeable battery, meaning a battery that can be reactivated by charging after discharge to continue its use. The single battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, or lead-acid battery, etc., and this application does not specifically limit its application. It should be noted that the actual application form of the energy storage device 140 provided in this application can be, but is not limited to, the listed products, and can also be other application forms. This application does not strictly limit the application form of the energy storage device 140. This application uses a prismatic battery as an example for illustration.

[0123] Understandably, the electrode assembly 142 includes a positive electrode, a separator, and a negative electrode. The positive electrode, the separator, and the negative electrode are stacked and then wound and pressed to form the electrode assembly 142. The positive electrode includes a stacked positive electrode material layer and a positive electrode current collector layer, and the negative electrode includes a stacked negative electrode material layer and a negative electrode current collector layer. The positive electrode current collector layer is made of aluminum foil, and the negative electrode current collector layer is made of copper foil.

[0124] Please see Figure 17 and Figure 18 This application also provides an electrical system 300, which includes an electrical device 310 and an energy storage device 140 provided in this application, wherein the energy storage device 140 is used to supply power to the electrical device 310.

[0125] Understandably, the energy storage device 140 is electrically connected to the electrical equipment 310.

[0126] In this embodiment, the end cap 210 assembly of the energy storage device 140 includes the first support member 240. When the energy storage device 140 experiences thermal runaway, the first support member 240 can still maintain the integrity of the structure, so that the first support part 242 can play a supporting role for the electrode assembly 142, thereby preventing the electrode assembly 142 from floating towards the side closer to the end cap 210 and blocking the pressure relief channel of the end cap mechanism 200. This ensures that the end cap mechanism 200 can release pressure and open the valve in time, and ultimately makes the energy storage device 140 have high safety performance and good performance, thereby providing electrical energy to the electrical equipment 310 and improving the user experience.

[0127] Optionally, the power system 300 in this application embodiment can be, but is not limited to, portable electronic devices such as mobile phones, tablets, laptops, desktop computers, smart bracelets, smartwatches, e-readers, and game consoles. It can also be a vehicle such as a car, truck, sedan, van, freight train, high-speed train, or electric vehicle. Furthermore, it can be various household appliances. Figure 17 The power system 300 in this embodiment is an energy storage battery cabinet.

[0128] It is understood that the power system 300 described in this embodiment is merely one form of the power system 300 used by the energy storage device 140, and should not be construed as a limitation on the power system 300 provided in this application, nor should it be construed as a limitation on the power system 300 provided in various embodiments of this application.

[0129] 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 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.

[0130] 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 end cap mechanism (200), characterized in that, The end cap mechanism (200) includes: End cap (210); and The lower insulating component (220) is disposed on one side of the end cap (210). The lower insulating component (220) includes a connected injection molded body (230) and a first support member (240). The melting point of the first support member (240) is higher than that of the injection molded body (230). The first support member (240) is at least partially embedded in the injection molded body (230).

2. The end cap mechanism (200) according to claim 1, characterized in that, The injection-molded body (230) includes an injection-molded body (231) and injection-molded ends (232). There are two injection-molded ends (232). The two injection-molded ends (232) are respectively connected to opposite sides of the injection-molded body (231) along a first direction. The injection-molded ends (232) are connected to the first support member (240). The first direction is the length direction of the end cap mechanism (200). The first support member (240) includes a first embedding part (241) and a first support part (242). There are two first support parts (242). The two first support parts (242) are respectively connected to the opposite sides of the first embedding part (241) along the second direction. The first embedding part (241) is at least partially embedded in the injection end (232). The first support part (242) is exposed in the injection end (232). The surface of the first support part (242) closest to the end cap (210) abuts against the end cap (210). The surface of the first support part (242) away from the end cap (210) protrudes from the surface of the first embedding part (241) away from the end cap (210). The second direction is the width direction of the end cap mechanism (200). The second direction intersects with the first direction.

3. The end cap mechanism (200) according to claim 2, characterized in that, The first embedding part (241) has a first through hole (2411), which penetrates two opposing surfaces of the first embedding part (241) along a third direction. The third direction is the height direction of the end cap mechanism (200), and the third direction intersects with the first direction and the second direction respectively. The injection molding end (232) includes an end body (2321) and a first connecting post (2322). The end body (2321) has a first insert cavity (2323). The first connecting post (2322) is located in the first insert cavity (2323) and the two opposite ends of the first connecting post (2322) along the third direction are respectively connected to the end body (2321). The first insert portion (241) is at least partially inserted through the first insert cavity (2323), and the first connecting post (2322) is inserted through the first through hole (2411).

4. The end cap mechanism (200) according to claim 3, characterized in that, The first embedding part (241) includes a first connecting sub-part (2412) and a first embedding sub-part (2413). There are two first connecting sub-parts (2412). Along the second direction, the two first connecting sub-parts (2412) are respectively connected to the opposite sides of the first embedding sub-part (2413). The surface of the first embedding sub-part (2413) facing the end cap (210) is recessed in the surface of the first connecting sub-part (2412) facing the end cap (210). The surface of the first embedding sub-part (2413) away from the end cap (210) protrudes from the surface of the first connecting sub-part (2412) away from the end cap (210). The first embedding sub-part (2413) is located in the first embedding cavity (2323). The first embedding sub-part (2413) has the first through hole (2411).

5. The end cap mechanism (200) according to claim 3, characterized in that, The first support portion (242) includes a first sub-part (2421), a second sub-part (2422), and a third sub-part (2423) that are bent and connected together. Along the third direction, the first sub-part (2421) and the third sub-part (2423) are bent toward the side of the second sub-part (2422) facing the end cap (210). The end of the first sub-part (2421) away from the second sub-part (2422) is connected to the first embedding portion (241). The end face of the third sub-part (2423) away from the second sub-part (2422) abuts against the end cap (210). The surface of the second sub-part (2422) away from the end cap (210) protrudes from the surface of the first embedding portion (241) away from the end cap (210).

6. The end cap mechanism (200) according to claim 5, characterized in that, The second sub-part (2422) has a vent (2424) that penetrates two opposite end faces of the second sub-part (2422) along a third direction, wherein the third direction is the height direction of the end cap mechanism (200) and intersects the first direction and the second direction respectively.

7. The end cap mechanism (200) according to claim 3, characterized in that, The injection molding end (232) includes a first plate sub-part (2324), a second plate sub-part (2325), a third plate sub-part (2326), a fourth plate sub-part (2327), and an extension sub-part (2328). The first plate sub-part (2324), the second plate sub-part (2325), the third plate sub-part (2326), and the fourth plate sub-part (2327) are connected end to end in sequence and form the first embedding cavity (2323). The end of the plate sub-part (2324) facing away from the fourth plate sub-part (2327) and the end of the second plate sub-part (2325) facing away from the third plate sub-part (2326) are respectively connected to the injection body (231); the extension sub-part (2328) is connected to the end of the fourth plate sub-part (2327) facing away from the end cap (210), and the extension sub-part (2328) protrudes from the surface of the second plate sub-part (2325) facing away from the end cap (210).

8. The end cap mechanism (200) according to claim 2, characterized in that, The end cap (210) has an explosion-proof hole (211) that penetrates two opposing surfaces of the end cap (210) along a third direction. The end cap mechanism (200) also includes an explosion-proof valve (250) and a second support member (260). The explosion-proof valve (250) is installed on the end cap (210) and covers the explosion-proof hole (211). The third direction is the height direction of the end cap mechanism (200), and the third direction intersects with the first direction and the second direction, respectively. The injection body (231) has a through hole (2311) that penetrates two opposing surfaces of the injection body (231) along a third direction. The second support (260) is connected to the injection body (231) at opposite ends along a second direction. The orthographic projection of the second support (260) onto the surface of the end cap (210) facing the lower insulating component (220) at least partially overlaps with the orthographic projection of the explosion-proof valve (250) onto the surface of the end cap (210) facing the lower insulating component (220). The melting point of the second support member (260) is higher than that of the injection body (230), and the surface of the second support member (260) away from the end cap (210) protrudes from the surface of the injection body (230) away from the end cap (210).

9. The end cap mechanism (200) according to claim 8, characterized in that, The second support member (260) includes a second embedding part (261) and a second support part (262). There are two second embedding parts (261). The two second embedding parts (261) are respectively connected to the two opposite sides of the second support part (262) along the second direction. The two second embedding parts (261) are located on the same side of the second support part (262) facing the end cap (210). The second embedding part (261) is at least partially embedded in the injection body (231). The end face of the second support part (262) away from the end cap (210) protrudes from the end face of the injection body (231) away from the end cap (210).

10. The end cap mechanism (200) according to claim 9, characterized in that, The second embedding part (261) includes a second embedding sub-part (2611) and a second connecting sub-part (2612) that are bent and connected together. The end of the second connecting sub-part (2612) opposite to the second embedding sub-part (2611) is connected to the second support part (262). Along the second direction, the second embedding sub-part (2611) and the second support part (262) are located on opposite sides of the second connecting sub-part (2612). The second support portion (262) includes a plurality of flat sub-parts (2621) and at least one bent sub-part (2622), the bent sub-part (2622) being located on the side of the flat sub-part (2621) facing the end cap (210); when the number of the bent sub-part (2622) is one, the number of the flat sub-parts (2621) is two, the two flat sub-parts (2621) being respectively connected to opposite sides of the bent sub-part (2622) along the second direction, and the end of each flat sub-part (2621) facing away from the bent sub-part (2622) being connected to the second connecting sub-part (2612). When there are multiple flat sub-parts (2621) and multiple bent sub-parts (2622), the flat sub-parts (2621) and the bent sub-parts (2622) are arranged alternately and bent and connected in sequence. Two adjacent bent sub-parts (2622) are located on the same side of the flat sub-parts (2621) connected to them. The number of flat sub-parts (2621) is one more than the number of bent sub-parts (2622). The two flat sub-parts (2621) are respectively distributed at two opposite ends of the second support part (262) along the second direction, and are bent and connected to the two second connecting sub-parts (2612) of the two second embedding parts (261) respectively.

11. The end cap mechanism (200) according to claim 9, characterized in that, The second embedding part (261) has a second through hole (2613), which penetrates two opposing surfaces of the second embedding part (261) along a third direction; The injection-molded body (231) includes a body portion (2312) and a second connecting post (2314). The body portion (2312) has a second insert cavity (2315). The second connecting post (2314) is located in the second insert cavity (2315) and the two opposite ends of the second connecting post (2314) along the third direction are respectively connected to the body portion (2312). The second insert portion (261) is at least partially inserted through the second insert cavity (2315), and the second connecting post (2314) is inserted through the second through hole (2613).

12. An energy storage device (140), characterized in that, The energy storage device (140) includes: The housing (141) has a receiving cavity (1411). Electrode assembly (142), said electrode assembly (142) being located within said receiving cavity (1411); and The end cap mechanism (200) according to any one of claims 1 to 11, the end cap mechanism (200) is located on one side of the housing (141), the end cap (210) is connected to the housing (141) to close the receiving cavity (1411); the electrode assembly (142) is electrically connected to the end cap mechanism (200) and is insulated from the end cap (210).

13. An electrical system (300), characterized in that, The power system (300) includes: Electrical equipment (310); and The energy storage device (140) of claim 12 is used to supply power to the electrical equipment (310).

Images