End cover assembly, energy storage device and electric equipment

Abstract

The invention provides an end cover assembly, an energy storage device and electric equipment. The end cover assembly comprises a top cover, the top cover is provided with a first surface and a second surface which are oppositely arranged, the top cover is further provided with a groove, and the groove is located in the second surface; and the lower plastic cement is arranged on the second surface side of the top cover, the lower plastic cement comprises a plastic cement body and a convex column, the convex column is convexly arranged on one side, facing the top cover, of the plastic cement body, and the convex column is accommodated in the groove and is connected with the top cover.

Description

Technical Field

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

[0002] To prevent short circuits caused by direct contact between the battery cell (or bare cell, electrode assembly) and the metal casing, an insulating film (Mylar film) is typically placed between the cell and the metal casing. To improve the integration of the end cap assembly and the cell, facilitate assembly, and enhance structural strength, the insulating film is usually bonded to the lower plastic layer of the end cap assembly. During battery assembly, transportation, and use, the insulating film can pull on the lower plastic layer due to gravity, causing deformation and potentially leading to a series of safety issues. Summary of the Invention

[0003] A first aspect of this application provides an end cap assembly, the end cap assembly comprising: A top cover having a first surface and a second surface disposed opposite to each other, and the top cover further having a groove located on the second surface; and The lower plastic is disposed on the second surface side of the top cover. The lower plastic includes a plastic body and a protrusion. The protrusion protrudes from the side of the plastic body facing the top cover and is accommodated in the groove and connected to the top cover.

[0004] The plastic body has a length direction, a width direction, and a predetermined central axis parallel to the length direction. The plastic body includes a connected support portion and a recessed portion. The recessed portion is disposed at one end of the support portion. The recessed portion includes a bottom plate, a side plate, and a first reinforcing component. The bottom plate, the side plate, and the support portion are sequentially bent and connected. The bottom plate and the support portion are bent in opposite directions relative to the side plate. The first reinforcing component includes a first reinforcing plate and a second reinforcing plate. Both the first and second reinforcing plates are disposed on the surface of the base plate facing the top cover and located on the side of the side plate away from the support portion. The first and second reinforcing plates are spaced apart along the width direction and both extend along the length direction. The first reinforcing plate is closer to the preset central axis than the second reinforcing plate. The base plate, the side plate, the first reinforcing plate, and the second reinforcing plate form a flow channel. The flow channel passes through the side plate so that the flow channel connects to the side of the support portion away from the top cover.

[0005] The recessed portion includes two first reinforcing components, which are spaced apart along the width direction of the plastic body. The flow channel includes a first flow channel and a second flow channel. One of the two first reinforcing components has a first flow channel, and the other of the two first reinforcing components has a second flow channel. The first flow channel has a first central axis, and the second flow channel has a second central axis. Both the first central axis and the second central axis are parallel to the length direction. The number of protruding pillars is multiple, with some of the protruding pillars located on both sides of the first central axis and some of the protruding pillars located on both sides of the second central axis.

[0006] The number of protrusions is multiple, the number of grooves is multiple, the protrusions and grooves are correspondingly arranged, the multiple protrusions include a first protrusion, the first protrusion is disposed on the surface of the bottom plate facing the top cover, the first protrusion is connected to the first reinforcing plate and the first protrusion protrudes towards the flow channel relative to the first reinforcing plate.

[0007] The first reinforcing plate and the first protruding post are located on the same side of the preset central axis.

[0008] The first protrusion has a flow guiding surface, which faces the flow channel.

[0009] The plastic body includes a first reinforcing component, and along the thickness direction of the top cover, a protrusion protrudes from the first reinforcing component toward the top cover.

[0010] The number of protrusions is multiple, and the multiple protrusions are spaced apart. A portion of the multiple protrusions are located on the same straight line, and the straight line is parallel to the width direction of the plastic body.

[0011] The recessed portion further includes a second reinforcing component, which is disposed on the same side of the base plate as the first reinforcing component. The second reinforcing component includes a third reinforcing plate, which is located on the side of the side plate away from the support portion and is spaced apart from the side plate along the length direction. The third reinforcing plate is connected to the first reinforcing plate.

[0012] The second reinforcing component further includes a fourth reinforcing plate, the opposite ends of which are connected to the third reinforcing plate and the side plate, respectively.

[0013] A portion of the third reinforcing plate protrudes toward the flow channel.

[0014] The number of protruding posts is multiple, the number of grooves is multiple, the protruding posts and the grooves are correspondingly arranged, and the multiple protruding posts also include a second protruding post, which is arranged on the surface of the bottom plate facing the top cover.

[0015] The second protruding post is located on the side of the second reinforcing plate opposite to the first reinforcing plate.

[0016] The second protrusion is connected to the second reinforcing plate, and the second protrusion protrudes towards the flow channel relative to the second reinforcing plate.

[0017] The first reinforcing component further includes a fifth reinforcing plate, which protrudes from the surface of the bottom plate facing the top cover. The fifth reinforcing plate is located on the side of the second reinforcing plate away from the first reinforcing plate, and the opposite ends of the fifth reinforcing plate are respectively connected to the second reinforcing plate and the side plate.

[0018] The first reinforcing component further includes a fifth reinforcing plate and a sixth reinforcing plate. The fifth reinforcing plate protrudes from the surface of the bottom plate facing the top cover and is located on the side of the second reinforcing plate away from the first reinforcing plate. The opposite ends of the fifth reinforcing plate are respectively connected to the second reinforcing plate and the side plate. The sixth reinforcing plate protrudes from the surface of the bottom plate facing the top cover and is located on the side of the second reinforcing plate away from the first reinforcing plate. The sixth reinforcing plate is connected to the fifth reinforcing plate.

[0019] The number of the recesses is two, and the two recesses are located at opposite ends of the support. The first reinforcing component of one of the two recesses includes the sixth reinforcing plate.

[0020] The number of protruding pillars is multiple, the number of grooves is multiple, the protruding pillars and the grooves are correspondingly arranged, and the multiple protruding pillars also include a second protruding pillar, which is disposed on the surface of the bottom plate facing the top cover; The sixth reinforcing plate is connected to the second reinforcing plate, and the second protrusion is spaced apart from the second reinforcing plate.

[0021] The number of protruding pillars is multiple, the number of grooves is multiple, the protruding pillars and the grooves are correspondingly arranged, and the multiple protruding pillars also include a second protruding pillar, which is disposed on the surface of the bottom plate facing the top cover; The sixth reinforcing plate is connected to the second reinforcing plate, and the second protruding post is connected to the second reinforcing plate and protrudes out of the flow channel.

[0022] The sixth reinforcing plate is connected to the second reinforcing plate, and the sixth reinforcing plate and the second reinforcing plate have an intersection point.

[0023] The plurality of protruding posts also include a second protruding post, which is located at the intersection of the second reinforcing plate and the sixth reinforcing plate.

[0024] In this embodiment, along the thickness direction of the top cover, the protruding post protrudes from the first reinforcing component in the direction of the top cover.

[0025] The plastic body has a length direction, a width direction, a first side extending along the length direction, and a second side extending along the width direction. There are multiple protrusions and multiple grooves. The protrusions and grooves are correspondingly arranged. The multiple protrusions also include second protrusions. The plastic body has second protrusions at both opposite ends along its length direction. One end of the second protrusion along the length direction includes a first sub-protrusion, and the other end of the second protrusion along the length direction includes a second sub-protrusion. The distance between the first sub-protrusion and the first side is different from the distance between the second sub-protrusion and the first side; and / or, the distance between the first sub-protrusion and the second side is different from the distance between the second sub-protrusion and the second side.

[0026] The plastic body has a length direction, a width direction, a first side extending along the length direction, and a second side extending along the width direction. There are multiple protrusions and multiple grooves. The protrusions and grooves are correspondingly arranged. The multiple protrusions also include second protrusions. The plastic body has second protrusions at both opposite ends along its length direction. One end of the second protrusion along the length direction includes a first sub-protrusion, and the other end of the second protrusion along the length direction includes a second sub-protrusion. The distance between the first sub-protrusion and the first side is different from the distance between the second sub-protrusion and the first side; and / or, the distance between the first sub-protrusion and the second side is different from the distance between the second sub-protrusion and the second side.

[0027] A second aspect of this application also provides an energy storage device, comprising: case; The end cap assembly according to the first aspect of this application, wherein the end cap assembly and the housing form a receiving cavity; and An electrode assembly is disposed in the receiving cavity and is electrically connected to the end cap assembly.

[0028] The end cap assembly further includes multiple pole posts, including a first pole post and a second pole post. The first pole post and the second pole post are electrically connected to the electrode assembly. The first pole post has a first identifier, and the second pole post has a second identifier. The first identifier and the second identifier are different.

[0029] A third aspect of this application also provides an electrical appliance, wherein the electrical appliance comprises: The device itself, and The energy storage device described in the second aspect of this application.

[0030] The end cap assembly of this application includes a top cover and a lower plastic. The top cover has a first surface and a second surface disposed opposite to each other, and the top cover also has a groove located on the second surface. The lower plastic is disposed on the second surface side of the top cover, and the lower plastic includes a plastic body and a protrusion. The protrusion protrudes from the side of the plastic body facing the top cover, and the protrusion is accommodated in the groove and connected to the top cover. The cooperation between the protrusion and the groove better fixes the lower plastic to the top cover, resulting in better integration between the lower plastic and the top cover, and improving the strength of the lower plastic. During the assembly, transportation, and use of the single battery, it can better prevent the lower plastic from deforming (e.g., deforming due to repeated stretching by the first insulating film) and detaching from the top cover. This prevents the lower plastic from deforming and being inserted into the electrode assembly, causing direct contact between the positive and negative electrode plates, which could lead to a short circuit, thus better avoiding safety hazards and improving the safety of the single battery. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of an energy storage system according to an embodiment of this application.

[0033] Figure 2 This is a schematic diagram of the structure of an electrical device according to an embodiment of this application.

[0034] Figure 3 This is a schematic diagram of the structure of an energy storage device according to an embodiment of this application.

[0035] Figure 4 This is a schematic diagram of the structure of an energy storage device according to another embodiment of this application.

[0036] Figure 5 For this application Figure 4 An exploded structural diagram of the energy storage device in the embodiment.

[0037] Figure 6 This is a schematic diagram of the structure of an electrode assembly according to an embodiment of this application.

[0038] Figure 7 This is a schematic diagram of the structure of an end cap assembly according to an embodiment of this application.

[0039] Figure 8 This is an exploded view of the end cap assembly according to the first embodiment of this application.

[0040] Figure 9 This is an exploded structural diagram of the end cap assembly of the first embodiment of this application from another perspective.

[0041] Figure 10 This is a schematic diagram of the lower plastic material from one perspective according to the first embodiment of this application.

[0042] Figure 11 This is a schematic diagram of the lower plastic material from another perspective, representing the first embodiment of this application.

[0043] Figure 12 For this application Figure 10 Plan view of the lower plastic in the embodiment.

[0044] Figure 13 for Figure 10 A magnified view of a portion of the image.

[0045] Figure 14 This is a schematic diagram of the lower plastic structure according to the second embodiment of this application.

[0046] Figure 15 For this application Figure 14 Plan view of the lower plastic in the embodiment.

[0047] Figure 16 This is a schematic diagram of the lower plastic structure according to the third embodiment of this application.

[0048] Figure 17 For this application Figure 16 Plan view of the lower plastic in the embodiment.

[0049] Figure 18 This is a schematic diagram of the lower plastic structure according to the fourth embodiment of this application.

[0050] Figure 19 For this application Figure 18 A plan view of the lower plastic in the embodiment.

[0051] Figure 20 This is a schematic diagram of the lower plastic material according to the fifth embodiment of this application.

[0052] Figure 21 This is a schematic diagram of the lower plastic material according to the sixth embodiment of this application.

[0053] Figure 22 This is an exploded view of the end cap assembly according to the second embodiment of this application.

[0054] Figure 23 This is an exploded structural diagram of the end cap assembly according to another perspective of the second embodiment of this application.

[0055] Figure 24 This is an exploded structural diagram of the end cap assembly according to a third embodiment of this application.

[0056] Figure 25 This is an exploded structural diagram of the end cap assembly according to another perspective of the third embodiment of this application.

[0057] Figure 26 This is an exploded structural diagram of the end cap assembly according to the fourth embodiment of this application.

[0058] Figure 27 This is an exploded structural diagram of the end cap assembly according to another perspective of the fourth embodiment of this application.

[0059] Figure 28 This is a schematic diagram of the pole structure according to an embodiment of this application.

[0060] Explanation of reference numerals in the attached figures: 100 - Energy storage system; 110 - High-voltage cable; 120 - First power conversion device; 130 - Second power conversion device; 200 - Electrical equipment; 210 - Equipment body; 300 - Energy storage device; 310 - Housing; 320 - Electrode assembly; 321 - Positive electrode; 322 - Diaphragm; 323 - Negative electrode; 330 - Receiving cavity; 340 - First insulating film; 350 - Second insulating film; 400 - End cap assembly; 410 - Top cover; 411 - First surface 412-Second surface, 413-Groove, 414-Explosion-proof hole, 420-Lower plastic, 421-Plastic body, 4211-First side, 4212-Second side, 422-Support, 4221-Through hole, 423-Recess, 4231-Base plate, 4232-Side plate, 42321-Through hole, 4233-First reinforcing component, 42331-First reinforcing plate, 42332-Second reinforcing plate, 42333-Flow channel, 42333a - First flow channel, 42333b - Second flow channel, 42334 - Fifth reinforcing plate, 42334a - Arc-shaped section, 42334b - Straight section, 42335 - Sixth reinforcing plate, 4234 - Second reinforcing component, 42341 - Third reinforcing plate, 42342 - Fourth reinforcing plate, 424 - Protruding pillar, 424a - First protruding pillar, 4241a - Guide surface, 424b - Second protruding pillar, 424b1 - First sub-protruding pillar, 424b2 - Second sub-protruding pillar 424c - Third protruding post, 430 - Explosion-proof component, 431 - Explosion-proof valve, 432 - Protective plate, 440 - Metal pressure ring, 440a - Positive metal pressure ring, 440b - Negative metal pressure ring, 450 - Upper plastic, 460 - Pole post, 461 - Flange, 462 - Through post, 460a - First pole post, 460b - Second pole post, 470 - Sealing ring, 480 - Adapter plate, 480a - Positive adapter plate, 480b - Negative adapter plate, 490 - Heat insulation plate. Detailed Implementation

[0061] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0062] 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.

[0063] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0064] It should be noted that, for ease of explanation, the same reference numerals denote the same components in the embodiments of this application, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0065] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve energy efficiency, it is necessary to store one form of energy in the same way or by converting it into another, and then release it in a specific energy form based on future application needs. Currently, the main way to generate green electricity is to develop green energy sources such as photovoltaics and wind power to replace fossil fuels.

[0066] 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.

[0067] Taking electrochemical energy storage as an example, this solution provides an energy storage device for use in energy storage systems. The energy storage device is equipped with a set of chemical batteries, which mainly use the chemical elements in the batteries as energy storage media. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage media. Simply put, the electrical energy generated by wind and solar energy is stored in the chemical batteries. When the use of external electrical energy reaches its peak, the stored electricity is released for use, or transferred to places with a shortage of electricity for use.

[0068] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, and consumption-side energy storage. The corresponding types of energy storage devices include: (1) Large-scale energy storage power stations applied to wind power and photovoltaic power stations can help renewable energy power generation meet grid connection requirements and improve the utilization rate of renewable energy. As a high-quality active / reactive power regulation power source on the power supply side, energy storage power stations can achieve load matching of power in time and space, enhance the absorption capacity of renewable energy, reduce instantaneous power changes, reduce the impact on the power grid, improve the absorption of new energy power generation, and are of great significance in power grid system backup, alleviating peak load power supply pressure and peak regulation and frequency regulation. (2) Energy storage containers applied on the grid side mainly function as peak shaving, frequency regulation and relief of grid congestion. In terms of peak shaving, they can realize peak shaving and valley filling of electricity load, that is, charging the energy storage battery when the electricity load is low and releasing the stored electricity during the peak electricity load period, thereby achieving a balance between power production and consumption. (3) Small energy storage cabinets applied to the electricity consumption side mainly function as self-consumption of electricity, peak-valley price arbitrage, capacity cost management, and improvement of power supply reliability. Depending on the application scenario, electricity consumption side energy storage can be divided into industrial and commercial energy storage cabinets, household energy storage devices, energy storage charging piles, etc., which are generally used in conjunction with distributed photovoltaics. Industrial and commercial users can use energy storage for peak-valley price arbitrage and capacity cost management. In the electricity market implementing peak-valley pricing, by charging the energy storage system when the electricity price is low and discharging the energy storage system when the electricity price is high, peak-valley price arbitrage can be achieved, reducing electricity costs. In addition, industrial enterprises subject to two-part tariffs can use energy storage systems to store energy during off-peak hours and discharge during peak loads, thereby reducing peak power and the maximum demand declared, achieving the goal of reducing capacity costs. Household photovoltaics with energy storage can improve the level of self-consumption of electricity. Due to high electricity prices and poor power supply stability, the demand for household photovoltaic installations is driven. Given that photovoltaic power generation occurs during the day, while user load is generally higher at night, configuring energy storage can better utilize photovoltaic power, improve self-consumption levels, and reduce electricity costs. Furthermore, energy storage is needed in areas such as communication base stations and data centers for backup power.

[0069] In some embodiments, see Figure 1 , Figure 1 This is a schematic diagram of the structure of an energy storage system 100 according to an embodiment of this application, and this application Figure 1 The embodiments are illustrated using a shared energy storage scenario on the generation / distribution side as an example. The energy storage device 300 of this application is not limited to its generation / distribution side energy storage scenario.

[0070] This application provides an energy storage system 100, which includes: a high-voltage cable 110, a first power conversion device 120, a second power conversion device 130, and an energy storage device 300 provided in this application. In some embodiments of the power generation scenario, the second power conversion device 130 can be a wind power conversion device. Since the electricity generated by wind power conversion is volatile, random, and intermittent, the unstable electricity output by the wind power conversion device can be stored in the energy storage device 300 through grid connection. The energy storage device 300 is connected to the high-voltage cable 110 and outputs smooth electricity to the power consumption side of the distribution network, realizing peak shaving and frequency regulation, and stable grid operation; or, wind power conversion... The power conversion device is always connected to the high-voltage cable 110. Under normal power generation conditions, the power output of the wind power conversion device is supplied to the power consumption side of the distribution network through the high-voltage cable 110. When the current power load is low and the wind power conversion device generates excess power, the excess power is first stored in the energy storage device 300 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 300 together with the high-voltage cable 110 in grid-connected mode to supply power to the power consumption side. This provides the power grid with various services such as peak shaving, frequency regulation, and backup, giving full play to the peak shaving role of the power grid, promoting peak shaving and valley filling, and alleviating the power supply pressure of the power grid.

[0071] In some embodiments on the distribution network side, the first power conversion device 120 can be a photovoltaic power conversion device, and the energy storage device 300 is connected to the high-voltage cable 110 and installed downstream of the high-voltage cable 110 between the user load and the user load. The power output by the photovoltaic power conversion device is stored in the energy storage device 300, which can respond in a timely manner and act as a backup power source when the power grid / distribution network fails; or, it can provide power supply support to alleviate line congestion when the high-voltage cable 110 transmission line is blocked, and to delay the economic pressure caused by the expansion of the power grid / distribution capacity when the power grid is planned to be expanded.

[0072] Optionally, the first power conversion device 120 may include, but is not limited to, a wind power conversion device, and the second power conversion device 130 may include, but is not limited to, a photovoltaic power conversion device. The first power conversion device 120 and the second power conversion device 130 can convert at least one of solar energy, light energy, wind energy, thermal energy, tidal energy, biomass energy and mechanical energy into electrical energy.

[0073] Optionally, the energy storage device 300 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.

[0074] Please see Figure 2This application embodiment also provides an electrical device 200, which includes a device body 210 and an energy storage device 300, wherein the energy storage device 300 is used to supply power to the device body 210.

[0075] Optionally, the electrical equipment 200 may be, but is not limited to, at least one of the following: power grid, base station, etc.

[0076] Optionally, the electrical equipment 200 and the energy storage device can be electrically connected via a high-voltage cable 110.

[0077] Optionally, the energy storage device 300 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 300 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 300.

[0078] Optionally, the individual cell can be, but is not limited to, at least one of cylindrical, prismatic, prismatic, or other shaped cells.

[0079] 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.

[0080] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of an energy storage device 300 according to an embodiment of this application.

[0081] In some embodiments, when the energy storage device 300 is a battery integrated system such as a battery pack, battery cluster, mobile power supply, energy storage cabinet / energy storage prefabricated cabin, the energy storage device 300 may include, but is not limited to, one or more individual batteries. When the energy storage device 300 includes multiple individual batteries, the multiple individual batteries may be connected in series, in parallel or in a mixed manner.

[0082] The term "multiple" refers to two or more, such as, but not limited to, 2, 5, 10, 30, 50, 100, 200, 300, 400, 800, 1000, etc. The number of individual batteries included in the energy storage device 300 can be determined based on the rated capacity of the individual batteries and the rated capacity to be achieved by the energy storage device 300.

[0083] To prevent short circuits caused by direct contact between the battery cell (or bare cell, electrode assembly) and the metal casing, an insulating film (Mylar film) is typically placed between the cell and the metal casing. To improve the integration of the end cap assembly and the cell, facilitate assembly, and enhance structural strength, the insulating film is usually bonded to the lower plastic of the end cap assembly. During battery assembly, transportation, and use, the insulating film can pull on the lower plastic under gravity, causing deformation and potentially leading to a series of safety issues.

[0084] Figure 4 This is a schematic diagram of the structure of an energy storage device 300 according to another embodiment of this application. Figure 5 For this application Figure 4 An exploded view of the energy storage device 300 in the embodiment. In the following descriptions of the embodiments of this application, the energy storage device 300 is illustrated and explained using a single battery cell as an example, and should not be construed as limiting the energy storage device 300 of this application.

[0085] Please see Figure 4 and Figure 5 This application also provides an energy storage device 300, which includes: a housing 310, an end cap assembly 400, an electrode assembly 320, and an electrolyte. The end cap assembly 400 and the housing 310 form a receiving cavity 330. The electrode assembly 320 is disposed in the receiving cavity 330 and is electrically connected to the end cap assembly 400. The electrolyte is disposed in the receiving cavity 330.

[0086] It should be noted that the electrolyte at least partially wets the electrode assembly 320.

[0087] Figure 6 This is a schematic diagram of the structure of an electrode assembly 320 according to an embodiment of this application. Please refer to... Figure 6 Optionally, the electrode assembly 320 includes a positive electrode 321, a separator 322, and a negative electrode 323. The positive electrode 321 and the negative electrode 323 are located on opposite sides of the separator 322. That is, the separator 322 is located between the positive electrode 321 and the negative electrode 323, separating them. It should be noted that the positive electrode 321, the separator 322, and the negative electrode 323 are all at least partially immersed in the electrolyte.

[0088] Optionally, the energy storage device 300 further includes a first insulating film 340 (Mylar film), which is disposed between the housing 310 and the electrode assembly 320 to insulate the housing 310 from the electrode assembly 320. The first insulating film 340 is connected to the end cap assembly 400.

[0089] It should be noted that there is electrolyte inside the first insulating film 340 and between the first insulating film 340 and the shell 310.

[0090] Optionally, the energy storage device 300 further includes a second insulating film 350 (also known as an insulating blue film), which is disposed on the outer periphery of the housing 310 to insulate the outer surface of the housing 310.

[0091] Figure 7 This is a schematic diagram of the structure of an end cap assembly 400 according to an embodiment of this application. Figure 8 This is an exploded view of an end cap assembly 400 according to an embodiment of this application. Figure 9 This is an exploded structural diagram of an end cap assembly 400 according to another embodiment of this application.

[0092] Please see Figures 7 to 9 This application embodiment also provides an end cap assembly 400, which includes a top cover 410 and a lower plastic 420. The top cover 410 has a first surface 411 and a second surface 412 disposed opposite to each other, and the top cover 410 also has a groove 413 located on the second surface 412. The lower plastic 420 is disposed on the second surface 412 side of the top cover 410, and the lower plastic 420 includes a plastic body 421 and a protrusion 424. The protrusion 424 protrudes from the side of the plastic body 421 facing the top cover 410, and the protrusion 424 is accommodated in the groove 413 and connected to the top cover 410.

[0093] Understandably, the first surface 411 is disposed away from the lower plastic 420, and the second surface 412 is disposed facing the lower plastic 420.

[0094] Optionally, the groove 413 penetrates the second surface 412 but does not penetrate the first surface 411; in other words, the groove 413 is a blind groove.

[0095] Optionally, the number of grooves 413 can be one or more. When the number of grooves 413 is multiple, the multiple grooves 413 are spaced apart on the second surface 412. Specifically, the number of grooves 413 can be, but is not limited to, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, etc. The term "multiple" means two or more.

[0096] Optionally, the number of protrusions 424 can be one or more. When the number of protrusions 424 is multiple, the multiple protrusions 424 are spaced apart on the side of the plastic body facing the top cover. Specifically, the number of protrusions 424 can be, but is not limited to, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, etc.

[0097] Optionally, the number of protrusions 424 is equal to the number of grooves 413, and the protrusions 424 and the grooves 413 correspond one-to-one.

[0098] It should be noted that the protrusions 424 and the grooves 413 correspond one-to-one. It can be understood that one protrusion 424 is inserted into one groove 413, and different protrusions are inserted into different grooves 413.

[0099] Optionally, the plastic body 421 and the protrusion 424 are an integral structure; in other words, the plastic body 421 and the protrusion 424 are different parts of the same component. The plastic body 421 and the protrusion 424 can be integrally injection molded and manufactured in the same process.

[0100] In some embodiments, the lower plastic 420 is a component, which is prepared by integral injection molding.

[0101] Understandably, the top cover 410 and the lower plastic 420 are stacked along the thickness direction of the plastic body 421.

[0102] Optionally, the lower plastic 420 and the top cover 410 are connected by a protrusion 424. In some embodiments, the protrusion 424 and the groove 413 are connected by an interference fit to connect the top cover 410 and the lower plastic 420. In other embodiments, an adhesive is provided between the protrusion 424 and the groove 413 to connect the top cover 410 and the lower plastic 420. In still other embodiments, the protrusion 424 of the lower plastic 420 and the top cover 410 are bonded to the top cover 410 by heat-melting the protrusion 424.

[0103] Optionally, the lower plastic 420 is connected to the first insulating film 340. Optionally, the first insulating film 340 is bonded to the opposite ends of the lower plastic 420 along the length of the plastic body 421 by heat fusion.

[0104] The end cap assembly 400 of this application includes a top cover 410 and a lower plastic 420. The top cover 410 has a first surface 411 and a second surface 412 disposed opposite to each other. The top cover 410 also has a groove 413 located on the second surface 412. The lower plastic 420 is disposed on the second surface 412 side of the top cover 410. The lower plastic 420 includes a plastic body 421 and a protrusion 424. The protrusion 424 protrudes from the side of the plastic body 421 facing the top cover 410. The protrusion 424 is accommodated in the groove 413 and connected to the top cover 410. The cooperation between the protrusion 424 and the groove 413 can better fix the lower plastic 420 and the top cover 410, making the lower plastic 420 and the top cover 410 more integrated and improving the strength of the lower plastic 420. During the assembly, transportation and use of the energy storage device 300, it can better prevent the lower plastic 420 from deforming (for example, deforming due to repeated pulling by the first insulating film 340) and detaching from the top cover 410. This can prevent the lower plastic 420 from being deformed and inserted into the electrode assembly 320, causing direct contact between the positive electrode 321 and the negative electrode 323, and thus short circuits. This can better avoid the occurrence of safety hazards and improve the safety of the energy storage device 300.

[0105] Figure 10 This is a schematic diagram of the lower plastic 420 from one perspective according to an embodiment of this application. Figure 11 This is a schematic diagram of the lower plastic 420 from another perspective, representing an embodiment of this application. Figure 12 For this application Figure 10 Plan view of the lower plastic 420 in the embodiment. Figure 13 for Figure 10 A magnified view of a portion of the image.

[0106] Please see Figures 10 to 13 In some embodiments, the plastic body 421 has a length direction (e.g., Figure 10 (as indicated by the double arrow X), width direction (as shown) Figure 10 (as indicated by the double arrow Y) and the preset centerline parallel to the length direction (such as...) Figure 12 (As shown by the dashed line OO), the plastic body 421 includes a connected support portion 422 and a recessed portion 423. The recessed portion 423 is disposed at one end of the support portion 422. The recessed portion 423 includes a base plate 4231, a side plate 4232, and a first reinforcing component 4233. The base plate 4231, the side plate 4232, and the support portion 422 are bent and connected in sequence. The base plate 4231 and the support portion 422 are bent in opposite directions relative to the side plate 4232. The first reinforcing component 4233 includes a first reinforcing plate 42331 and a second reinforcing plate 42332. Both the first reinforcing plate 42331 and the second reinforcing plate 42332 are disposed on the surface of the base plate 4231 facing the top cover 410 and located on the side of the side plate 4232 opposite to the support portion 422. The first reinforcing plate 42331 and the second reinforcing plate 42332 are spaced apart along the width direction of the lower plastic 420, and the first reinforcing plate 42331 and the second reinforcing plate 42332... All 32 extend along the length of the lower plastic 420. The first reinforcing plate 42331 is closer to the preset central axis than the second reinforcing plate 42332. The bottom plate 4231, the side plate 4232, the first reinforcing plate 42331 and the second reinforcing plate 42332 form a flow channel 42333. The flow channel 42333 passes through the side plate 4232 so that the flow channel 42333 connects to the side of the support part 422 away from the top cover 410.

[0107] It should be noted that the length dimension of the plastic body 421 is larger than the width dimension of the plastic body 421. The width dimension of the plastic body 421 is larger than the thickness dimension of the plastic body 421 (e.g., ...). Figure 10 The dimensions are shown by the double arrow Z.

[0108] It should be noted that the flow channel 42333 penetrates the side plate 4232, which can be understood as the side plate 4232 having a through hole 42321 (e.g., Figure 11 As shown), the through hole 42321 connects the flow channel 42333 and the support part 422 on the side away from the top cover 410.

[0109] Understandably, the base plate 4231, side plate 4232, first reinforcing plate 42331, second reinforcing plate 42332 and support part 422 are an integral structure.

[0110] When thermal runaway or electrochemical reaction occurs in the energy storage device 300, the airflow generated inside the energy storage device 300 flows into the flow channel 42333 from the end away from the support part 422. After flowing through the flow channel 42333, it flows into the support part 422 from the through hole 42321 of the side plate 4232 to the side away from the top cover 410.

[0111] Understandably, the recessed portion 423 and the support portion 422 are arranged along the length of the plastic body 421.

[0112] Optionally, the number of recesses 423 can be one or two. When the number of recesses 423 is two, the two recesses 423 are respectively disposed on opposite sides of the support portion 422 along the length direction of the plastic body 421.

[0113] Optionally, the surface of the recess 423 facing the top cover 410 is flush with or coplanar with the surface of the support 422 facing the top cover 410. This allows the surface of the plastic body 421 facing the top cover 410 to be flat overall, which can better fit and conform to the second surface 412 of the top cover 410.

[0114] Optionally, the surfaces of the first reinforcing plate 42331 facing the top cover 410, the second reinforcing plate 42332 facing the top cover 410, and the support portion 422 facing the top cover 410 are flush or coplanar. This ensures that the surface of the plastic body 421 facing the top cover 410 is generally flat, allowing for better fit with the second surface 412 of the top cover 410.

[0115] In other words, the second reinforcing plate 42332 is closer to the first side 4211 of the plastic body 421 than the first reinforcing plate 42331. It can also be understood that the first reinforcing plate 42331 is closer to the center of the recess 423 than the second reinforcing plate 42332 (e.g., the plastic body 421 has a predetermined central axis parallel to its length direction, such as...). Figure 12 (As shown by the dashed line OO).

[0116] In a specific example, the base plate 4231 is parallel to the support part 422, and the base plate 4231 and the support part 422 are perpendicular to the side plate 4232 respectively.

[0117] It should be noted that the base plate 4231 protrudes from the support portion 422 in the direction away from the top cover 410. It can be understood that the surface of the recessed portion 423 away from the top cover 410 protrudes from the surface of the support portion 422 away from the top cover 410.

[0118] It should be noted that the recess 423 is used for the first insulating film 340 of the hot melt energy storage device 300, that is, the recess 423 is connected to the first insulating film 340.

[0119] Optionally, the first reinforcing plate 42331 and the second reinforcing plate 42332 are arranged in parallel. In other embodiments, the first reinforcing plate 42331 and the second reinforcing plate 42332 may also have a certain angle.

[0120] Please see also Figure 8 and Figure 9Optionally, the top cover 410 has explosion-proof holes 414 that penetrate the first surface 411 and the second surface 412 respectively, and the support portion 422 has a plurality of through holes 4221 (such as fence holes) spaced apart; the through holes 4221 penetrate the surface of the support portion 422 facing the top cover 410 and the surface of the support portion 422 away from the top cover 410 respectively. The plurality of through holes 4221 and the explosion-proof holes 414 at least partially overlap or overlap; in other words, the orthographic projection of the plurality of through holes 4221 on the second surface 412 and the orthographic projection of the explosion-proof holes 414 on the second surface 412 at least partially overlap. The through holes 4221 are used to discharge the gas generated in the energy storage device 300 to the explosion-proof holes 414 through the through holes 4221 when thermal runaway or electrochemical reaction occurs in the energy storage device 300, so that explosion and pressure relief can occur through the explosion-proof holes 414, thereby improving the safety of the energy storage device 300.

[0121] Please see also Figure 8 and Figure 9 Optionally, the end cap assembly 400 further includes an explosion-proof assembly 430, which includes an explosion-proof valve 431 and a protective plate 432. The explosion-proof valve 431 and the protective plate 432 are spaced apart at the explosion-proof hole 414 and are respectively connected to the top cover 410. The explosion-proof valve 431 is positioned closer to the lower plastic 420 than the protective plate 432. Understandably, the orthographic projection of the explosion-proof valve 431 on the second surface 412 and the orthographic projection of the plurality of through holes 4221 on the second surface 412 are at least partially overlapped. The explosion-proof valve 431 has grooves (not shown) to ensure timely pressure relief when the gas pressure inside the energy storage device 300 reaches a preset value due to thermal runaway or electrochemical reaction. This improves the safety of the energy storage device 300. The protective plate 432 protects the explosion-proof valve 431 to prevent it from being punctured before the explosion conditions are met.

[0122] In this embodiment, a flow channel 42333 is provided in the recess 423. The flow channel 42333 connects to the side of the support part 422 away from the top cover 410, thereby connecting to multiple through holes 4221 of the support part 422. When the energy storage device 300 experiences thermal runaway or an electrochemical reaction, a portion of the gas generated inside the energy storage device 300 flows through the flow channel 42333 to the surface of the support part 422 away from the top cover 410, thereby diverting, dispersing and balancing the gas pressure inside the energy storage device 300, reducing the pressure on the explosion-proof component 430 on the top cover 410, and improving the safety of the energy storage device 300. In addition, the edges of the flow channel 42333 are provided with a first reinforcing plate 42331 and a second reinforcing plate 42332. This not only improves the strength of the recess 423, allowing the recess 423 to better support the first insulating film 340 and better prevent the lower plastic 420 from deforming, thus improving the safety of the energy storage device 300, but also allows for better weight reduction of the lower plastic 420 and reduces the weight of the energy storage device 300.

[0123] Please see again Figure 12 and Figure 13 In some embodiments, the recess 423 includes two first reinforcing components 4233, which are spaced apart along the width direction of the plastic body 421. The flow channel 42333 includes a first flow channel 42333a and a second flow channel 42333b. One of the two first reinforcing components 4233 has the first flow channel 42333a, and the other of the two first reinforcing components 4233 has the second flow channel 42333b. The first flow channel 42333a has a first central axis (e.g., ...). Figure 12 (dashed line MM), the second flow channel 42333b has a second central axis (e.g. Figure 12 (dashed line NN), the first central axis and the second central axis are both parallel to the length direction; The number of protruding posts 424 is multiple, with some of the protruding posts 424 located on both sides of the first central axis and some of the protruding posts 424 located on both sides of the second central axis.

[0124] In this embodiment, by setting two first reinforcing components 4233, a portion of the protrusions 424 are located on both sides of the first central axis, and a portion of the plurality of protrusions 424 are located on both sides of the second central axis, the strength of the recessed portion 423 at various locations can be made more balanced, resulting in higher overall strength. Furthermore, by setting the second reinforcing components 4234, the first insulating film 340 can be better supported. When the recessed portion 423 is pulled by the first insulating film 340, the force on the recessed portion 423 can be better distributed, preventing deformation of the lower plastic 420 and improving the safety of the energy storage device 300.

[0125] Please see again Figure 12 and Figure 13 In some embodiments, along the thickness direction of the top cover 410, the protrusion 424 protrudes from the first reinforcing component 4233 toward the top cover 410.

[0126] Understandably, the protruding post 424 protrudes from the first reinforcing plate 42331 and the second reinforcing plate 42332 in the direction toward the top cover 410.

[0127] In this embodiment, the protrusion 424 protrudes from the first reinforcing component 4233 toward the top cover 410. This allows the protrusion 424 and the groove 413 to better fit and connect, improving the connection strength between the lower plastic 420 and the top cover 410, better supporting the recessed portion 423, preventing the flow channel 42333 from collapsing, and improving the safety of the energy storage device 300.

[0128] Please see Figure 13 In some embodiments, there are multiple protrusions 424 and multiple grooves 413. The protrusions 424 and the grooves 413 are correspondingly arranged. The multiple protrusions 424 include a first protrusion 424a. The first protrusion 424a is disposed on the surface of the bottom plate 4231 facing the top cover 410. The first protrusion 424a is connected to the first reinforcing plate 42331 and the first protrusion 424a protrudes towards the flow channel 42333 relative to the first reinforcing plate 42331.

[0129] Understandably, the first protrusion 424a protrudes towards the second reinforcing plate 42331 relative to the first reinforcing plate 42331.

[0130] Understandably, the first protrusion 424a also protrudes from the surface of the first reinforcing plate 42331 facing the top cover 410. In other words, along the thickness direction of the plastic body 421, the height of the first protrusion 424a is greater than the height of the first reinforcing plate 42331. It is also understood that the first protrusion 424a protrudes from the surface of the plastic body 421 facing the top cover 410.

[0131] Optionally, the radial dimension of the first protrusion 424a is greater than the thickness of the first reinforcing plate 42331 (i.e., the dimension of the first reinforcing plate 42331 along the width direction of the plastic body 421). This not only improves the connection strength between the first protrusion 424a and the top cover 410, providing better support for the recess 423, but also allows the first protrusion 424a to protrude more towards the flow channel 42333, thereby better turbulenting the airflow through the flow channel 42333 and balancing the air pressure within the flow channel 42333. Furthermore, by providing the first protrusion 424a on one side of the flow channel 42333, when the energy storage device 300 experiences thermal runaway or an electrochemical reaction, the first protrusion 424a can better support the top cover 410, preventing the flow channel 42333 from collapsing and improving the safety of the energy storage device 300.

[0132] In this embodiment, a first protrusion 424a is provided on the first reinforcing plate 42331, and the first protrusion 424a protrudes out of the flow channel 42333. The connection between the first reinforcing plate 42331 and the first protrusion 424a not only improves the strength of the first reinforcing plate 42331, but also improves the strength of the first protrusion 424a, thereby making the connection between the recess 423 and the top cover 410 more stable. In addition, the first protrusion 424a protrudes out of the flow channel 42333, which can turbulentize the airflow in the flow channel 42333, better balance the air pressure in the flow channel 42333, and improve the safety of the energy storage device 300.

[0133] Please see again Figure 12 and Figure 13 In some embodiments, the plastic body 421 has a predetermined central axis parallel to the length direction (e.g., Figure 12 As shown by the dashed line OO), the first reinforcing plate 42331 and the first protruding post 424a are both located on the same side of the preset central axis.

[0134] Understandably, when there are multiple sets of first reinforcing components 4233, the first protrusion 424a near each set of first reinforcing components 4233 and the first reinforcing plate 42331 of the first reinforcing component 4233 are located on the same side of the preset central axis.

[0135] Optionally, both the first reinforcing plate 42331 and the first protruding post 424a are positioned close to the preset central axis.

[0136] In this embodiment, by placing the first reinforcing plate 42331 and the first protrusion 424a at a position close to the preset central axis, the recessed portion 423 can be better reinforced and supported, thereby better preventing the lower plastic 420 from being stretched and deformed by the first insulating film 340, and improving the safety of the energy storage device 300.

[0137] like Figure 12 and Figure 13 As shown, in some embodiments, the first protrusion 424a has a flow guiding surface 4241a facing the flow channel 42333.

[0138] Optionally, the guide surface 4241a can be, but is not limited to, at least one of a cylindrical arc surface, an inclined surface, etc.

[0139] In this embodiment, the first protrusion 424a protrudes towards the flow channel 42333 relative to the first reinforcing plate 42331. By providing a guide surface 4241a on the first protrusion 424a, the airflow flowing through the flow channel 42333 can be better guided and disturbed, and the air pressure in the flow channel 42333 can be balanced.

[0140] In some embodiments, the plastic body 421 includes a first reinforcing component 4233, and a protrusion 424 protrudes from the first reinforcing component 4233 toward the top cover 410 along the thickness direction of the top cover 410.

[0141] In other words, along the thickness direction of the top cover 410, the protrusion 424 protrudes from the first reinforcing plate 42331 and the second reinforcing plate 42332 in the direction toward the top cover 410.

[0142] This allows the protruding post 424 and the groove 413 to better fit and connect, improving the connection strength between the lower plastic 420 and the top cover 410, better supporting the recessed part 423, preventing the flow channel 42333 from collapsing, and improving the safety of the energy storage device 300.

[0143] In some embodiments, there are multiple protrusions 424, which are spaced apart, and a portion of the protrusions 424 are located on the same straight line, which is parallel to the width direction of the plastic body 421.

[0144] Optionally, multiple protrusions 424 disposed on the same recess 423 are located on the same straight line, and the straight line is parallel to the width direction of the plastic body 421.

[0145] In this embodiment, a portion of the plurality of protrusions 424 are located on the same straight line, which is parallel to the width direction of the plastic body 421. This improves the connection strength between the lower plastic 420 and the top cover 410. When the lower plastic 420 is connected to the first insulating film 340, it can better disperse the tensile force of the first insulating film 340 on the lower plastic 420, and better prevent the lower plastic 420 from deforming and causing a short circuit between the positive electrode 321 and the negative electrode 323. This better avoids the generation of safety hazards and thus improves the safety of the energy storage device 300.

[0146] Please see again Figure 12 and Figure 13 In some embodiments, the recessed portion 423 further includes a second reinforcing component 4234, which is disposed on the same side of the base plate 4231 as the first reinforcing component 4233. The second reinforcing component 4234 includes a third reinforcing plate 42341, which is located on the side of the side plate 4232 away from the support portion 422 and is spaced apart from the side plate 4232 along the length direction. The third reinforcing plate 42341 is connected to the first reinforcing plate 42331.

[0147] In this embodiment, by providing the third reinforcing plate 42341, not only can the strength of the recessed portion 423 be improved, but the third reinforcing plate 42341 is also used for hot-melt bonding of the first insulating film 340, which can increase the bonding area between the first insulating film 340 and the recessed portion 423 and improve the connection strength between the first insulating film 340 and the recessed portion 423.

[0148] Please see again Figure 12 and Figure 13 In some embodiments, the plastic body 421 has a preset central axis parallel to the length direction, and the recessed portion 423 includes at least two first reinforcing components 4233. The at least two first reinforcing components 4233 are spaced apart along the width direction of the plastic body 421, and are symmetrically arranged relative to the preset central axis along the width direction. The recessed portion 423 also includes a second reinforcing component 4234. The second reinforcing component 4234 and the first reinforcing component 4233 are disposed on the same side of the base plate 4231. The second reinforcing component 4234 is located between two adjacent first reinforcing components 4233 and is respectively connected to the first reinforcing plates 42331 of the two first reinforcing components 4233.

[0149] It should be noted that the second reinforcing component 4234 is connected to the first insulating film 340. Understandably, the base plate 4231, side plate 4232, first reinforcing component 4233, and second reinforcing component 4234 are an integral structure.

[0150] Understandably, the number of second reinforcing components 4234 is at least one. A second reinforcing component 4234 is disposed between each two adjacent first reinforcing components 4233.

[0151] In this embodiment, by setting two first reinforcing components 4233 and a second reinforcing component 4234, and symmetrically arranging the two first reinforcing components 4233 along a preset central axis, the strength of each position of the recessed portion 423 can be relatively balanced, resulting in high overall strength. Furthermore, by setting the second reinforcing component 4234, the first insulating film 340 can be better supported. When the recessed portion 423 is pulled by the first insulating film 340, the force on the recessed portion 423 can be better distributed, preventing deformation of the lower plastic 420 and improving the safety of the energy storage device 300.

[0152] Please see again Figure 13 In some embodiments, the second reinforcing component 4234 includes a third reinforcing plate 42341, which is located on the side of the side plate 4232 away from the support portion 422 and is spaced apart from the side plate 4232 along the length direction. The opposite ends of the third reinforcing plate 42341 are respectively connected to the side of the two first reinforcing plates 42331 of the two first reinforcing components 4233 away from the support portion 422.

[0153] Optionally, the third reinforcing plate 42341 is symmetrical along the preset central axis.

[0154] Understandably, the third reinforcing plate 42341 extends along the width direction of the plastic body 421, and the third reinforcing plate 42341 is set close to the plastic body 421 and parallel to the preset central axis in the length direction.

[0155] Optionally, the third reinforcing plate 42341 is spaced apart from the side plate 4232.

[0156] It should be noted that the third reinforcing plate 42341 is used to connect the first insulating film 340 of the energy storage device 300. Optionally, the surface of the third reinforcing plate 42341 facing away from the side plate 4232 is used to connect the first insulating film 340 of the energy storage device 300.

[0157] It should be noted that the surface of the third reinforcing plate 42341 facing away from the support part 422 is part of the end face or side face of the lower plastic 420 along the length direction.

[0158] In this embodiment, by providing the third reinforcing plate 42341, not only can the strength of the recessed portion 423 be improved, but the third reinforcing plate 42341 is also used for hot-melt bonding of the first insulating film 340, which can increase the bonding area between the first insulating film 340 and the recessed portion 423 and improve the connection strength between the first insulating film 340 and the recessed portion 423.

[0159] See you again Figure 13 In some embodiments, the second reinforcing component 4234 further includes a fourth reinforcing plate 42342, the opposite ends of which are connected to the third reinforcing plate 42341 and the side plate 4232, respectively.

[0160] Understandably, in this embodiment, the second reinforcing component 4234 includes a third reinforcing plate 42341 and a fourth reinforcing plate 42342.

[0161] Optionally, when the recess 423 includes two first reinforcing components 4233, the fourth reinforcing plate 42342 is located between the two first reinforcing plates 42331 of the two adjacent first reinforcing components 4233.

[0162] Understandably, the fourth reinforcing plate 42342 is also connected to the base plate 4231.

[0163] Understandably, the fourth reinforcing plate 42342 extends along the length of the plastic body 421. Optionally, the first reinforcing plate 42331, the second reinforcing plate 42332, and the fourth reinforcing plate 42342 are all parallel to a predetermined central axis. In one specific embodiment, the fourth reinforcing plate 42342 is located on the predetermined central axis.

[0164] In this embodiment, the second reinforcing component 4234 includes a fourth reinforcing plate 42342. The fourth reinforcing plate 42342 can better stabilize the third reinforcing plate 42341, better prevent the third reinforcing plate 42341 from being pulled and deformed by the first insulating film 340, and improve the safety of the energy storage device 300.

[0165] Please see again Figure 12 and Figure 13 In some embodiments, the plurality of protrusions 424 further include a second protrusion 424b, which is disposed on the surface of the base plate 4231 facing the top cover 410.

[0166] In this embodiment, by providing the second protrusion 424b, the connection strength between the edge of the recess 423 and the edge of the top cover 410 can be better strengthened, and the structural strength of the recess 423 can be improved. This can better prevent the lower plastic 420 from being deformed by the first insulating film 340, and improve the safety of the energy storage device 300 when in use.

[0167] In some embodiments, the second protrusion 424b is located on the side of the second reinforcing plate 42332 opposite to the first reinforcing plate 42331.

[0168] Understandably, the second protrusion 424b is closer to the first side surface 4211 than the second reinforcing plate 42332. It is also understood that in this embodiment, the second protrusion 424b is located between the second reinforcing plate 42332 and the first side surface 4211.

[0169] Understandably, the second protrusion 424b also protrudes from the surface of the second reinforcing plate 42332 facing the top cover 410. In other words, along the thickness direction of the plastic body 421, the height of the second protrusion 424b is greater than the height of the second reinforcing plate 42332. It is also understood that the second protrusion 424b protrudes from the surface of the plastic body 421 facing the top cover 410.

[0170] Understandably, the first protrusion 424a and the second protrusion 424b are located on opposite sides of the flow channel 42333.

[0171] In some embodiments, the recess 423 is provided with two first protrusions 424a and two second protrusions 424b, that is, the recess 423 is provided with four protrusions 424. The two first protrusions 424a and the two second protrusions 424b are arranged sequentially at intervals along a direction parallel to the width direction. In other words, the two first protrusions 424a and the two second protrusions 424b are arranged on the same straight line.

[0172] In this embodiment, by providing a second protrusion 424b and positioning it on the side of the second reinforcing plate 42332 opposite to the first reinforcing plate 42331, the connection strength between the edge of the recess 423 and the edge of the top cover 410 can be better strengthened, improving the structural strength of the recess 423. This better prevents the lower plastic 420 from being deformed by the first insulating film 340, improving the safety of the energy storage device 300 during use. Furthermore, by providing the second protrusion 424b on the other side of the flow channel 42333, when the energy storage device 300 experiences thermal runaway or an electrochemical reaction, the second protrusion 424b can better support the top cover 410, preventing the flow channel 42333 from collapsing and further improving the safety of the energy storage device 300 during use.

[0173] Figure 14 This is a schematic diagram of the structure of the lower plastic 420 according to the second embodiment of this application. Figure 15 For this application Figure 14 Plan view of the lower plastic 420 in the embodiment. Figure 16 This is a schematic diagram of the structure of the lower plastic 420 according to the third embodiment of this application. Figure 17 For this application Figure 16 Plan view of the lower plastic 420 in the embodiment. Figure 18 This is a schematic diagram of the structure of the lower plastic 420 according to the fourth embodiment of this application. Figure 19 For this application Figure 18 Plan view of the lower plastic 420 in the embodiment.

[0174] Please see Figures 14 to 19 In some embodiments, the plurality of protrusions 424 further include a second protrusion 424b, which is disposed on the surface of the base plate 4231 facing the top cover 410; the second protrusion 424b is connected to the second reinforcing plate 42332, and the second protrusion 424b protrudes toward the flow channel 42333 relative to the second reinforcing plate 42332.

[0175] Understandably, the second protrusion 424b protrudes toward the first reinforcing plate 42331 relative to the second reinforcing plate 42332.

[0176] Optionally, the radial dimension of the second protrusion 424b is greater than the thickness of the second reinforcing plate 42332 (i.e., the dimension of the second reinforcing plate 42332 along the width direction of the plastic body 421). This not only improves the connection strength between the second protrusion 424b and the top cover 410, providing better support for the recess 423, but also allows the second protrusion 424b to protrude more towards the flow channel 42333, thereby better turbulenting the airflow through the flow channel 42333 and balancing the air pressure within the flow channel 42333.

[0177] In this embodiment, a second protrusion 424b is provided on the second reinforcing plate 42332, and the second protrusion 424b protrudes out of the flow channel 42333. The connection between the second reinforcing plate 42332 and the second protrusion 424b not only improves the strength of the second reinforcing plate 42332, but also improves the strength of the second protrusion 424b, thereby making the connection between the recess 423 and the top cover 410 more stable. In addition, the second protrusion 424b protrudes out of the flow channel 42333, which can turbulentize the airflow in the flow channel 42333, better balance the air pressure in the flow channel 42333, and improve the safety of the energy storage device 300.

[0178] Please see again Figure 13 In some embodiments, a portion of the third reinforcing plate 42341 protrudes toward the flow channel 42333.

[0179] Understandably, another part of the third reinforcing plate 42341 is offset from the flow channel 42333.

[0180] In this embodiment, a portion of the third reinforcing plate 42341 protrudes towards the flow channel 42333, while the other portion is offset from the flow channel 42333. This increases the welding area between the third reinforcing plate 42341 and the first insulating film 340, improving the connection strength between them. Furthermore, it enhances the strength of the recessed portion 423, better preventing deformation of the lower plastic 420. Moreover, when the energy storage device 300 experiences thermal runaway or an electrochemical reaction, the position of the flow channel 42333 near the preset central axis has a greater airflow than the position further away from the preset central axis (i.e., near the first side 4211). This increases the turbulence effect on the position of the flow channel 42333 near the preset central axis, balances the air pressure within the flow channel 42333, and improves the safety of the energy storage device 300.

[0181] Please see also Figures 12 to 19 In other embodiments, the plurality of protrusions 424 include a first protrusion 424a, which is disposed on the surface of the base plate 4231 facing the top cover 410. The first protrusion 424a is connected to the first reinforcing plate 42331 and protrudes toward the flow channel 42333 relative to the first reinforcing plate 42331. The width of the third reinforcing plate 42341 protruding out of the flow channel 42333 is greater than the width of the first protrusion 424a protruding out of the flow channel 42333.

[0182] In this embodiment, the width of the third reinforcing plate 42341 protruding from the flow channel 42333 is greater than the width of the first protrusion 424a protruding from the flow channel 42333. The third reinforcing plate 42341 is closer to the inlet of the flow channel 42333 than the first protrusion 424a. When the battery experiences thermal runaway or an electrochemical reaction, the protruding portion of the third reinforcing plate 42341 can better direct the airflow to the position of the flow channel 42333 near the second reinforcing plate 42332, providing better turbulence. After the airflow enters the flow channel 42333, it undergoes secondary turbulence through the first protrusion 424a, which can better balance the air pressure within the flow channel 42333 and improve the safety of the energy storage device 300.

[0183] Please see also Figure 13 , Figure 14 , Figure 16 and Figure 18In some other embodiments, the first reinforcing component 4233 further includes a fifth reinforcing plate 42334, which protrudes from the surface of the bottom plate 4231 facing the top cover 410. The fifth reinforcing plate 42334 is located on the side of the second reinforcing plate 42332 away from the first reinforcing plate 42331, and the opposite ends of the fifth reinforcing plate 42334 are respectively connected to the second reinforcing plate 42332 and the side plate 4232.

[0184] It should be noted that the surface of the fifth reinforcing plate 42334 facing away from the second reinforcing plate 42332 is part of the side surface of the recess 423. The surface of the fifth reinforcing plate 42334 facing away from the second reinforcing plate 42332 is part of the first side surface 4211.

[0185] Understandably, in this embodiment, at least a portion of the first reinforcing component 4233 on the recess 423 includes a first reinforcing plate 42331, a second reinforcing plate 42332 and a fifth reinforcing plate 42334.

[0186] Optionally, the fifth reinforcing plate 42334 is partly arc-shaped and partly planar. For example... Figure 13 As shown, it can be understood that the fifth reinforcing plate 42334 includes a connected arc-shaped segment 42334a and a straight segment 42334b, wherein the arc-shaped segment 42334a is connected to the second reinforcing plate 42332, and the straight segment 42334b is connected to the side plate 4232.

[0187] In this embodiment, by using the fifth reinforcing plate 42334, and connecting the second reinforcing plate 42332 and the side plate 4232 to the opposite ends of the fifth reinforcing plate 42334, the strength of the second reinforcing plate 42332 and the side plate 4232 can be improved, thereby improving the strength of the recessed portion 423. When the second protrusion 424b is connected to the second reinforcing plate 42332, the strength of the second protrusion 424b can also be improved, thereby improving the connection strength between the lower plastic 420 and the top cover 410, better preventing the lower plastic 420 from deforming, and improving the safety of the energy storage device 300 in use.

[0188] Please see also Figure 13 , Figure 18 ,and Figure 20 In some other embodiments, the first reinforcing component 4233 further includes a sixth reinforcing plate 42335, which protrudes from the surface of the bottom plate 4231 facing the top cover 410. The sixth reinforcing plate 42335 is located on the side of the second reinforcing plate 42332 away from the first reinforcing plate 42331, and the fifth reinforcing plate 42334 is connected to the sixth reinforcing plate 42335.

[0189] Understandably, in this embodiment, at least a portion of the first reinforcing component 4233 on the recess 423 includes a first reinforcing plate 42331, a second reinforcing plate 42332, a fifth reinforcing plate 42334, and a sixth reinforcing plate 42335.

[0190] Optionally, the number of the sixth reinforcing plate 42335 can be one or more, such as Figure 20 As shown, when there are multiple sixth reinforcing plates 42335, the multiple sixth reinforcing plates 42335 can be arranged at intervals or connected together.

[0191] In this embodiment, by setting the fifth reinforcing plate 42334 and the sixth reinforcing plate 42335, the strength of the recessed portion 423 can be improved, so that the recessed portion 423 can better support the first insulating film 340, better prevent the lower plastic 420 from deforming, and improve the safety of the energy storage device 300.

[0192] Please see again Figure 14 and Figure 15 The number of recesses 423 is two, and the two recesses 423 are respectively located at opposite ends of the support portion 422. The first reinforcing component 4233 of one of the two recesses 423 includes the sixth reinforcing plate 42335.

[0193] Understandably, the first reinforcing component 4233 of the other of the two recesses 423 includes a sixth reinforcing plate 42335 that is not included.

[0194] It is also understood that the first reinforcing component 4233 of one of the two recesses 423 includes a first reinforcing plate 42331, a second reinforcing plate 42332, a fifth reinforcing plate 42334 and a sixth reinforcing plate 42335, and the first reinforcing component 4233 of one of the two recesses 423 includes a first reinforcing plate 42331, a second reinforcing plate 42332 and a fifth reinforcing plate 42334.

[0195] In other embodiments, when the recess 423 includes at least two first reinforcing components 4233, among the at least two first reinforcing components 4233 of the same recess 423, some of the first reinforcing components 4233 include a first reinforcing plate 42331, a second reinforcing plate 42332, a fifth reinforcing plate 42334 and the sixth reinforcing plate 42335, and some of the first reinforcing components 4233 include a first reinforcing plate 42331, a second reinforcing plate 42332 and a fifth reinforcing plate 42334.

[0196] In this embodiment, by designing different structures for the first reinforcing components 4233 on the two recesses 423, the weight and cost of the end cap assembly 400 can be reduced. Furthermore, the different structures of the first reinforcing components 4233 on the two recesses 423 can also serve as a foolproof method during the assembly of the end cap assembly 400.

[0197] Please see Figure 21 In some embodiments, there are two recesses 423, which are located at opposite ends of the support portion 422. The first reinforcing component 4233 of one of the two recesses 423 includes the sixth reinforcing plate 42335. The plurality of protrusions 424 also include a second protrusion 424b, which is disposed on the surface of the bottom plate 4231 facing the top cover 410. The sixth reinforcing plate 42335 is connected to the second reinforcing plate 42332, and the second protrusion 424b is spaced apart from the second reinforcing plate 42332.

[0198] Understandably, the first reinforcing component 4233 of the other of the two recesses 423 includes a sixth reinforcing plate 42335 that is not included.

[0199] It is also understood that the first reinforcing component 4233 of one of the two recesses 423 includes a first reinforcing plate 42331, a second reinforcing plate 42332, a fifth reinforcing plate 42334 and a sixth reinforcing plate 42335, and the first reinforcing component 4233 of one of the two recesses 423 includes a first reinforcing plate 42331, a second reinforcing plate 42332 and a fifth reinforcing plate 42334.

[0200] Optionally, the second reinforcing plate 42332 of the first reinforcing assembly 4233, which is composed of the first reinforcing plate 42331, the second reinforcing plate 42332 and the fifth reinforcing plate 42334, is connected to the second protrusion 424b.

[0201] In this embodiment, by designing the structure of the first reinforcing component 4233 on the two recesses 423 differently, and by designing the positional relationship between the second reinforcing plate 42332 and the second protrusion 424b of the first reinforcing component 4233 on the two recesses 423, a better error prevention effect can be achieved.

[0202] Please see again Figure 14 and Figure 15The number of recesses 423 is two, and the two recesses 423 are respectively located at opposite ends of the support portion 422. The first reinforcing component 4233 of one of the two recesses 423 includes the sixth reinforcing plate 42335. The plurality of protrusions 424 also include a second protrusion 424b, which is disposed on the surface of the bottom plate 4231 facing the top cover 410. The sixth reinforcing plate 42335 is connected to the second reinforcing plate 42332, and the second protrusion 424b is connected to the second reinforcing plate 42332 and protrudes out of the flow channel 42333.

[0203] Understandably, the sixth reinforcing plate 42335 connects the second protrusion 424b and the second reinforcing plate 42332.

[0204] In this embodiment, by providing the sixth reinforcing plate 42335, the second reinforcing plate 42332 and the fifth reinforcing plate 42334 can be better connected together, resulting in better overall strength. Furthermore, the sixth reinforcing plate 42335 connects to the second protrusion 424b, providing better reinforcement to the second protrusion 424b. Moreover, the second protrusion 424b protruding from the flow channel 42333 can better turbulentize the airflow passing through the flow channel 42333, balancing the air pressure within the flow channel 42333.

[0205] Optionally, the end of the sixth reinforcing plate 42335 facing away from the second reinforcing plate 42332 is connected to the fifth reinforcing plate 42334, and the opposite ends of the sixth reinforcing plate 42335 are respectively connected to the second reinforcing plate 42332 and the fifth reinforcing plate 42334.

[0206] Understandably, the second protrusion 424b also protrudes from the surface of the sixth reinforcing plate 42335 facing the top cover 410. In other words, along the thickness direction of the plastic body 421, the height of the second protrusion 424b is greater than the height of the sixth reinforcing plate 42335. It is also understood that the second protrusion 424b protrudes from the surface of the plastic body 421 facing the top cover 410.

[0207] In this embodiment, by providing the sixth reinforcing plate 42335, the second reinforcing plate 42332 and the fifth reinforcing plate 42334 can be better connected together, resulting in better overall strength. In addition, the sixth reinforcing plate 42335 connects to the second protrusion 424b, which can better reinforce the second protrusion 424b.

[0208] Please see Figure 10 , Figures 12 to 15 , Figure 18 , Figure 19 , Figure 20 and Figure 21In some embodiments, the sixth reinforcing plate 42335 is connected to the second reinforcing plate 42332, and the sixth reinforcing plate 42335 and the second reinforcing plate 42332 have an intersection point.

[0209] In this embodiment, the sixth reinforcing plate 42335 is connected to the second reinforcing plate 42332, which can improve the structural strength of the sixth reinforcing plate 42335 and the second reinforcing plate 42332, and improve the structural strength of the recessed portion 423, which can better prevent the lower plastic 420 from being deformed by the first insulating film 340.

[0210] Please see Figure 15 , Figure 18 , Figure 19 and Figure 20 In some embodiments, the plurality of protrusions 424 further include a second protrusion 424b, which is located at the intersection of the sixth reinforcing plate 42335 and the second reinforcing plate 42332.

[0211] In this embodiment, the second protrusion 424b is located at the intersection of the sixth reinforcing plate 42335 and the second reinforcing plate 42332. The sixth reinforcing plate 42335 and the second reinforcing plate 42332 can strengthen and support the second protrusion 424b, so that the second protrusion 424b has better structural strength and the lower plastic 420 and the top cover 410 have better bonding strength.

[0212] Please see again Figure 12 In some embodiments, the plastic body 421 has a length direction, a width direction, a first side surface 4211 extending along the length direction, and a second side surface 4212 extending along the width direction. The plurality of protrusions 424 also include second protrusions 424b. The plastic body 421 has second protrusions 424b at opposite ends along the length direction. One end of the second protrusion 424b along the length direction includes a first sub-protrusion 424b1, and the other end of the second protrusion 424b along the length direction includes a second sub-protrusion 424b2. The distance between the first sub-protrusion 424b1 and the first side surface 4211 is different from the distance between the second sub-protrusion 424b2 and the first side surface 4211; and / or, the distance between the first sub-protrusion 424b1 and the second side surface 4212 is different from the distance between the second sub-protrusion 424b2 and the second side surface 4212.

[0213] Understandably, the plastic body 421 has a second protrusion 424b at both ends along its length, and the distance between the second protrusion 424b at both ends along its length and the first side surface 4211 is different; and / or, the distance between the second protrusion 424b at both ends along its length and the second side surface 4212 is different.

[0214] Understandably, in this embodiment, the plastic body 421 includes two recesses 423 and a support 422, with the two recesses 423 located at opposite ends of the support 422. Each of the two recesses 423 is provided with a second protrusion 424b, and the distances between the two second protrusions 424b in the two recesses 423 and the distances between the two second protrusions 424b in the first side surface 4211 and the second side surface 4212 are different.

[0215] In this embodiment, by making the distance between the second protrusion 424b on the two recesses 423 and the first side surface 4211 different; and / or, by making the distance between the second protrusion 424b on the two recesses 423 and the second side surface 4212 different, the assembly of the lower plastic 420 and the top cover 410 can be prevented from being assembled incorrectly without adding a new structural design. This can better prevent the top cover 410 and the lower plastic 420 from being assembled backwards and improve the assembly efficiency of the end cover assembly 400.

[0216] Please see again Figure 12 , Figure 14 , Figure 16 and Figure 18 In some embodiments, the plurality of protrusions 424 further include a plurality of third protrusions 424c, which are spaced apart on the surface of the support portion 422 facing the top cover 410. Optionally, the plurality of third protrusions 424c are arranged symmetrically along a preset central axis and symmetrically along a central axis parallel to the width direction.

[0217] In a specific example, the plurality of protrusions 424 include eight third protrusions 424c.

[0218] In one specific example, the lower plastic 420 includes four first protrusions 424a, four second protrusions 424b, and eight third protrusions 424c. It should be noted that the accompanying drawings only illustrate the lower plastic 420 including four first protrusions 424a, four second protrusions 424b, and eight third protrusions 424c. In other embodiments, the lower plastic 420 may also include other numbers of first protrusions 424a, second protrusions 424b, and third protrusions 424c; the numbers illustrated in the drawings should not be construed as limiting the lower plastic 420 and the protrusions 424c of this application.

[0219] In some embodiments, the plurality of protrusions 424 are symmetrically arranged along a preset central axis. In other embodiments, the plurality of protrusions 424 are symmetrically arranged along a central axis parallel to the width direction. In still other embodiments, the plurality of protrusions 424 are symmetrically arranged along both the preset central axis and the central axis parallel to the width direction.

[0220] Figure 22 This is an exploded view of the end cap assembly 400 according to the second embodiment of this application. Figure 23 This is an exploded structural diagram of the end cap assembly 400 from another perspective, representing the second embodiment of this application. Figure 24 This is an exploded view of the end cap assembly 400 according to a third embodiment of this application. Figure 25 This is an exploded structural diagram of the end cap assembly 400 from another perspective, representing the third embodiment of this application. Figure 26 This is an exploded view of the end cap assembly 400 according to the fourth embodiment of this application. Figure 27 This is an exploded structural diagram of the end cap assembly 400 from another perspective, representing the fourth embodiment of this application. Figure 28 This is a schematic diagram of the structure of the pole post 460 according to an embodiment of this application.

[0221] Please see Figure 8 , Figure 9 , Figures 22 to 28 In some embodiments, the end cap assembly 400 further includes: Metal pressure ring 440, the metal pressure ring 440 is disposed on the side of the top cover 410 opposite to the lower plastic 420; Upper plastic 450 is disposed between metal pressure ring 440 and top cover 410 to insulate metal pressure ring 440 from top cover 410; The pole post 460 includes a flange 461 and a through post 462 protruding from the flange 461. The flange 461 is located on the side of the lower plastic 420 away from the top cover 410. The through post 462 passes through the lower plastic 420, the top cover 410, the upper plastic 450 and the metal pressure ring 440 in sequence, and is electrically connected to the metal pressure ring 440. A sealing ring 470 is disposed between the flange portion 461 and the lower plastic 420, and is fitted around the outer periphery of the through post 462; and Adapter piece 480 is located on the side of the flange portion 461 opposite to the lower plastic 420 and is electrically connected to the flange portion 461.

[0222] Optionally, the metal retaining ring 440 can be a positive metal retaining ring 440a or a negative metal retaining ring 440b; the terminal 460 can be a first terminal 460a or a second terminal 460b; the adapter 480 can be a positive adapter 480a or a negative adapter 480b, the positive adapter 480a is used to electrically connect the positive electrode tab of the positive electrode 321, and the negative adapter 480b is used to electrically connect the negative electrode tab of the negative electrode 323. When the metal retaining ring 440 is the positive electrode metal retaining ring 440a, the terminal 460 is the first terminal 460a, the first terminal 460a is the positive terminal, and the adapter piece 480 is the positive adapter piece 480a; when the metal retaining ring 440 is the negative electrode metal retaining ring 440b, the terminal 460 is the second terminal 460b, the second terminal 460b is the negative terminal, and the adapter piece 480 is the negative adapter piece 480b.

[0223] In some embodiments, the end cap assembly 400 includes a plurality of electrode posts 460, the plurality of electrode posts 460 including a first electrode post 460a and a second electrode post 460b, the first electrode post 460a and the second electrode post 460b being electrically connected to the electrode assembly 320, the first electrode post 460a having a first identifier and the second electrode post 460b having a second identifier, the first identifier being different from the second identifier.

[0224] Optionally, the first identifier may be at least one of, but not limited to, color, pattern, etc.

[0225] Optionally, the second identifier may be, but is not limited to, at least one of color, pattern, etc.

[0226] In this embodiment, by setting a first mark on the first pole post 460a and a second mark on the second pole post 460b, and making the first mark different from the second mark, machine vision detection and recognition (CCD recognition) can be better performed when the end cap assembly 400 is assembled. This can better avoid the first pole post 460a and the second pole post 460b being installed backwards, which has a good error prevention effect and can improve the assembly efficiency of the end cap assembly 400.

[0227] In a specific example, the first pole piece 460a and the second pole piece 460b are different colors, so that when the end cap assembly 400 is assembled, machine vision inspection and recognition (CCD recognition) can be performed better, thereby better avoiding the first pole piece 460a and the second pole piece 460b being installed in reverse, which has a good foolproof effect and can improve the assembly efficiency of the end cap assembly 400.

[0228] In some embodiments, the end cap assembly 400 further includes a heat insulation sheet 490 disposed between the adapter piece 480 and the lower plastic 420. The heat insulation sheet 490 is used to prevent heat generated by the adapter piece 480 and the electrode post 460 from being transferred to the lower plastic 420 during welding of the adapter piece 480 to the electrode post 460, charging and discharging of the energy storage device 300, or thermal runaway, thus preventing deformation of the lower plastic 420 and improving the safety of the energy storage device 300. Optionally, each electrode post 460 has a heat insulation sheet 490 on each opposite side, i.e., two heat insulation sheets 490 are spaced apart on opposite sides of the electrode post 460.

[0229] In this application, the terms "embodiment" and "implementation" mean that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of these phrases in various locations throughout the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described in this application can be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the various embodiments of this application can be arbitrarily combined to form yet another embodiment that does not depart from the spirit and scope of the technical solution of this application, provided there is no contradiction between them.

[0230] 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 assembly, characterized in that, The end cap assembly includes: A top cover having a first surface and a second surface disposed opposite to each other, and the top cover further having a groove located on the second surface; and The lower plastic is disposed on the second surface side of the top cover. The lower plastic includes a plastic body and a protrusion. The protrusion protrudes from the side of the plastic body facing the top cover and is accommodated in the groove and connected to the top cover.

2. The end cap assembly according to claim 1, characterized in that, The plastic body includes a connected support portion and a recessed portion, the recessed portion being disposed at one end of the support portion; the recessed portion includes a bottom plate, a side plate, and a first reinforcing component, the bottom plate, the side plate, and the support portion being bent and connected in sequence, the bottom plate and the support portion being bent in opposite directions relative to the side plate respectively; The first reinforcing component includes a first reinforcing plate and a second reinforcing plate. The first reinforcing plate and the second reinforcing plate are spaced apart on the surface of the bottom plate facing the top cover and located on the side of the side plate away from the support portion. The bottom plate, the side plate, the first reinforcing plate and the second reinforcing plate form a flow channel. The flow channel passes through the side plate so that the flow channel connects to the side of the support portion away from the top cover.

3. The end cap assembly according to claim 2, characterized in that, The first reinforcing component further includes a fifth reinforcing plate and a sixth reinforcing plate. The fifth reinforcing plate protrudes from the surface of the bottom plate facing the top cover. The fifth reinforcing plate is located on the side of the second reinforcing plate away from the first reinforcing plate. The opposite ends of the fifth reinforcing plate are respectively connected to the second reinforcing plate and the side plate. The sixth reinforcing plate protrudes from the surface of the bottom plate facing the top cover. The sixth reinforcing plate is located on the side of the second reinforcing plate away from the first reinforcing plate. The sixth reinforcing plate is connected to the fifth reinforcing plate.

4. The end cap assembly according to claim 3, characterized in that, The number of recesses is two, and the two recesses are located at opposite ends of the support. The first reinforcing component of one of the two recesses includes the sixth reinforcing plate.

5. The end cap assembly according to claim 4, characterized in that, The number of protrusions is multiple, the number of grooves is multiple, the protrusions and grooves are correspondingly arranged, and the multiple protrusions also include a second protrusion, which is disposed on the surface of the base plate facing the top cover; The sixth reinforcing plate is connected to the second reinforcing plate, and the second protrusion is spaced apart from the second reinforcing plate.

6. The end cap assembly according to claim 4, characterized in that, The number of protrusions is multiple, the number of grooves is multiple, the protrusions and grooves are correspondingly arranged, and the multiple protrusions also include a second protrusion, which is disposed on the surface of the base plate facing the top cover; The sixth reinforcing plate is connected to the second reinforcing plate, and the second protruding post is connected to the second reinforcing plate and protrudes out of the flow channel.

7. The end cap assembly according to claim 2, characterized in that, The number of protruding posts is multiple, the number of grooves is multiple, the protruding posts and the grooves are correspondingly arranged, and the multiple protruding posts also include a second protruding post, which is arranged on the surface of the bottom plate facing the top cover.

8. The end cap assembly according to claim 7, characterized in that, The second protrusion is located on the side of the second reinforcing plate opposite to the first reinforcing plate.

9. The end cap assembly according to claim 8, characterized in that, The second protrusion is connected to the second reinforcing plate, and the second protrusion protrudes toward the flow channel relative to the second reinforcing plate.

10. The end cap assembly according to claim 1, characterized in that, The plastic body has a length direction, a width direction, a first side extending along the length direction, and a second side extending along the width direction. There are multiple protrusions and multiple grooves. The protrusions and grooves are correspondingly arranged. The multiple protrusions also include second protrusions. The plastic body has second protrusions at both opposite ends along its length direction. One end of the second protrusion along the length direction includes a first sub-protrusion, and the other end of the second protrusion along the length direction includes a second sub-protrusion. The distance between the first sub-protrusion and the first side is different from the distance between the second sub-protrusion and the first side; and / or, the distance between the first sub-protrusion and the second side is different from the distance between the second sub-protrusion and the second side.

11. An energy storage device, characterized in that, include: case; The end cap assembly according to any one of claims 1-10, wherein the end cap assembly and the housing form a receiving cavity; as well as An electrode assembly is disposed in the receiving cavity and is electrically connected to the end cap assembly.

12. An electrical appliance, characterized in that, The electrical equipment includes: The device itself, and The energy storage device of claim 11, wherein the energy storage device is used to supply power to the device body.

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