End cap assembly, energy storage device, and electric appliance

Abstract

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

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy storage, in particular to a terminal cover assembly, an energy storage device and an electric equipment. BACKGROUND

[0002] In order to avoid short circuit caused by direct contact between the battery cell (also known as bare cell or electrode assembly) and the metal shell, an insulating film (i.e. Mylar film) is usually arranged between the battery cell and the metal shell. In order to make the terminal cover assembly and the battery cell have better integrity, be easier to assemble and improve the structural strength, the insulating film is usually bonded with the lower plastic of the terminal cover assembly. During the assembly, transportation and use of the battery, the insulating film will pull the lower plastic along the direction of gravity, causing the lower plastic to deform, and thus causing a series of safety problems. SUMMARY

[0003] The first aspect of the present application provides a terminal cover assembly, comprising:

[0004] a top cover having a first surface and a second surface arranged opposite to each other, the top cover further having a groove, the groove being located at the second surface; and

[0005] a lower plastic arranged at the second surface side of the top cover, the lower plastic comprising a plastic body and a protruding column, the protruding column being protruded at one side of the plastic body facing the top cover, the protruding column being accommodated in the groove and connected with the top cover.

[0006] The plastic body has a length direction, a width direction and a preset middle axis parallel to the length direction, the plastic body comprising a support portion and a recess portion connected with each other, the recess portion being arranged at one end of the support portion; the recess portion comprising a bottom plate, a side plate and a first reinforcing assembly, the bottom plate, the side plate and the support portion being connected in sequence by being bent, the bottom plate and the support portion being bent in opposite directions compared with the side plate respectively;

[0007] The first reinforcing assembly comprises a first reinforcing plate and a second reinforcing plate, the first reinforcing plate and the second reinforcing plate being arranged at the surface of the bottom plate facing the top cover and located at the side of the side plate away from the support portion, the first reinforcing plate and the second reinforcing plate being arranged in the width direction and extending in the length direction, the first reinforcing plate being closer to the preset middle axis compared with the second reinforcing plate, the bottom plate, the side plate, the first reinforcing plate and the second reinforcing plate surrounding a flow passage, the flow passage penetrating through the side plate so as to make the flow passage communicate with the side of the support portion away from the top cover.

[0008] The recess comprises two first reinforcing components, the two first reinforcing components are arranged at intervals along the width direction of the plastic body, the flow channel comprises a first flow channel and a second flow channel, one of the two first reinforcing components has the first flow channel, the other of the two first reinforcing components has the second flow channel, the first flow channel has a first central axis, the second flow channel has a second central axis, and the first central axis and the second central axis are parallel to the length direction.

[0009] The number of the convex columns is multiple, and a part of the multiple convex columns are located on both sides of the first central axis, and a part of the multiple convex columns are located on both sides of the second central axis.

[0010] The number of the convex columns is multiple, and the number of the grooves is multiple, the convex columns and the grooves are arranged correspondingly, the multiple convex columns comprise a first convex column, the first convex column is arranged on the surface of the bottom plate facing the top cover, the first convex column is connected with the first reinforcing plate, and the first convex column protrudes towards the flow channel compared with the first reinforcing plate.

[0011] The first reinforcing plate and the first convex column are located on the same side of the preset central axis.

[0012] The first convex column has a flow guide surface, and the flow guide surface faces the flow channel.

[0013] The plastic body comprises a first reinforcing component, and the convex column protrudes towards the top cover compared with the first reinforcing component along the thickness direction of the top cover.

[0014] The number of the convex columns is multiple, the multiple convex columns are arranged at intervals, and a part of the multiple convex columns are located on the same straight line, and the straight line is parallel to the width direction of the plastic body.

[0015] The recess further comprises a second reinforcing component, the second reinforcing component and the first reinforcing component are arranged on the same side of the bottom plate, the second reinforcing component comprises a third reinforcing plate, the third reinforcing plate is located on the side of the side plate away from the support part, and is arranged at intervals along the length direction and the side plate, and the third reinforcing plate is connected with the first reinforcing plate.

[0016] The second reinforcing component further comprises a fourth reinforcing plate, and the opposite ends of the fourth reinforcing plate are connected with the third reinforcing plate and the side plate respectively.

[0017] A part of the third reinforcing plate protrudes towards the flow channel.

[0018] The number of the convex columns is multiple, the number of the grooves is multiple, the convex columns are correspondingly arranged with the grooves, the multiple convex columns further include a second convex column, and the second convex column is arranged on the surface of the bottom plate facing the top cover.

[0019] The second convex column is located on the side of the second reinforcing plate away from the first reinforcing plate.

[0020] The second convex column is connected with the second reinforcing plate, and the second convex column protrudes toward the flow passage compared with the second reinforcing plate.

[0021] The first reinforcing assembly further includes a fifth reinforcing plate, the fifth reinforcing plate is convexly arranged on 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 opposite ends of the fifth reinforcing plate are connected with the second reinforcing plate and the side plate respectively.

[0022] The first reinforcing assembly further includes a fifth reinforcing plate and a sixth reinforcing plate, the fifth reinforcing plate is convexly arranged on 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 opposite ends of the fifth reinforcing plate are connected with the second reinforcing plate and the side plate respectively, the sixth reinforcing plate is convexly arranged on 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, and the sixth reinforcing plate is connected with the fifth reinforcing plate.

[0023] The number of the recessed parts is two, the two recessed parts are respectively located on opposite ends of the supporting part, and the first reinforcing assembly of one of the two recessed parts includes the sixth reinforcing plate.

[0024] The number of the convex columns is multiple, the number of the grooves is multiple, the convex columns are correspondingly arranged with the grooves, the multiple convex columns further include a second convex column, and the second convex column is arranged on the surface of the bottom plate facing the top cover.

[0025] The sixth reinforcing plate is connected with the second reinforcing plate, and the second convex column is arranged at intervals with the second reinforcing plate.

[0026] The number of the convex columns is multiple, the number of the grooves is multiple, the convex columns are correspondingly arranged with the grooves, the multiple convex columns further include a second convex column, and the second convex column is arranged on the surface of the bottom plate facing the top cover.

[0027] The sixth reinforcing plate is connected with the second reinforcing plate, and the second convex column is connected with the second reinforcing plate and protrudes from the flow passage.

[0028] The sixth reinforcing plate is connected with the second reinforcing plate, and the sixth reinforcing plate and the second reinforcing plate have an intersection point.

[0029] The plurality of convex columns further include a second convex column, and the second convex column is located at the intersection point of the second reinforcing plate and the sixth reinforcing plate.

[0030] In the thickness direction of the top cover, the convex column protrudes in the direction of the top cover.

[0031] The plastic body has a length direction, a width direction, a first side surface extending in the length direction, and a second side surface extending in the width direction. The number of convex columns is multiple, and the number of grooves is multiple. The convex columns and the grooves are correspondingly arranged. The plurality of convex columns further include a second convex column. The plastic body is provided with the second convex column at opposite ends in the length direction. The second convex column at one end of the plastic body in the length direction includes a first sub-convex column. The second convex column at the other end of the plastic body in the length direction includes a second sub-convex column. The distance between the first sub-convex column and the first side surface is different from the distance between the second sub-convex column and the first side surface. And / or, the distance between the first sub-convex column and the second side surface is different from the distance between the second sub-convex column and the second side surface.

[0032] The plastic body has a length direction, a width direction, a first side surface extending in the length direction, and a second side surface extending in the width direction. The number of convex columns is multiple, and the number of grooves is multiple. The convex columns and the grooves are correspondingly arranged. The plurality of convex columns further include a second convex column. The plastic body is provided with the second convex column at opposite ends in the length direction. The second convex column at one end of the plastic body in the length direction includes a first sub-convex column. The second convex column at the other end of the plastic body in the length direction includes a second sub-convex column. The distance between the first sub-convex column and the first side surface is different from the distance between the second sub-convex column and the first side surface. And / or, the distance between the first sub-convex column and the second side surface is different from the distance between the second sub-convex column and the second side surface.

[0033] The second aspect of the present application further provides an energy storage device, comprising:

[0034] A shell;

[0035] The end cover assembly of the first aspect of the present application encloses a receiving cavity with the shell; and

[0036] An electrode assembly is arranged in the receiving cavity, and the electrode assembly is electrically connected with the end cover assembly.

[0037] The end cover assembly further includes a plurality of polar posts, the plurality of polar posts including a first polar post and a second polar post, the first polar post and the second polar post being electrically connected with the electrode assembly respectively, the first polar post having a first mark, and the second polar post having a second mark, the first mark being different from the second mark.

[0038] The third aspect of the present application further provides a power utilization device, wherein the power utilization device includes:

[0039] a device body, and

[0040] The energy storage device of the second aspect of the present application.

[0041] The end cover assembly of the present application includes a top cover and a lower plastic, the top cover having a first surface and a second surface arranged oppositely, the top cover further having a groove, the groove being located at the second surface; the lower plastic is arranged at the second surface side of the top cover, the lower plastic including a plastic body and a protruding column, the protruding column being protruded at one side of the plastic body facing the top cover, the protruding column being accommodated in the groove and connected with the top cover. Through the cooperation of the protruding column and the groove, the lower plastic and the top cover can be better fixed, so that the lower plastic and the top cover have better integration, the strength of the lower plastic can be better improved, and the lower plastic can better avoid deformation (such as deformation due to repeated pulling by the first insulation film), separation from the top cover during the processes of single battery assembly, transportation and use, so that the lower plastic inserted into the electrode assembly after deformation can make the positive electrode tab and the negative electrode tab directly contact, and then short circuit occurs, and the generation of safety hazards can be better avoided, so that the safety of the single battery use can be better improved. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0043] Figure 1 The structure schematic diagram of the energy storage system of an embodiment of the present application.

[0044] Figure 2 The structure schematic diagram of the power utilization device of an embodiment of the present application.

[0045] Figure 3 The structure schematic diagram of the energy storage device of an embodiment of the present application.

[0046] Figure 4 The structure schematic diagram of the energy storage device of another embodiment of the present application.

[0047] Figure 5 For the application Figure 4 The exploded structural diagram of the energy storage device of the embodiment.

[0048] Figure 6 The structural diagram of the electrode assembly of the embodiment of the application.

[0049] Figure 7 The structural diagram of the end cover assembly of the embodiment of the application.

[0050] Figure 8 The exploded structural diagram of the end cover assembly of the first embodiment of the application from one perspective.

[0051] Figure 9 The exploded structural diagram of the end cover assembly of the first embodiment of the application from another perspective.

[0052] Figure 10 The structural diagram of the lower plastic of the first embodiment of the application from one perspective.

[0053] Figure 11 The structural diagram of the lower plastic of the first embodiment of the application from another perspective.

[0054] Figure 12 For the application Figure 10 The plan view of the lower plastic of the embodiment.

[0055] Figure 13 For Figure 10 The enlarged view of the part.

[0056] Figure 14 The structural diagram of the lower plastic of the second embodiment of the application.

[0057] Figure 15 For the application Figure 14 The plan view of the lower plastic of the embodiment.

[0058] Figure 16 The structural diagram of the lower plastic of the third embodiment of the application.

[0059] Figure 17 For the application Figure 16 The plan view of the lower plastic of the embodiment.

[0060] Figure 18 The structural diagram of the lower plastic of the fourth embodiment of the application.

[0061] Figure 19 For the application Figure 18 The plan view of the lower plastic of the embodiment.

[0062] Figure 20A structure diagram of a lower plastic of a fifth embodiment of the present application.

[0063] Figure 21 A structure diagram of a lower plastic of a sixth embodiment of the present application.

[0064] Figure 22 An exploded structure diagram of an end cap assembly of a second embodiment of the present application from one perspective.

[0065] Figure 23 An exploded structure diagram of an end cap assembly of a second embodiment of the present application from another perspective.

[0066] Figure 24 An exploded structure diagram of an end cap assembly of a third embodiment of the present application from one perspective.

[0067] Figure 25 An exploded structure diagram of an end cap assembly of a third embodiment of the present application from another perspective.

[0068] Figure 26 An exploded structure diagram of an end cap assembly of a fourth embodiment of the present application from one perspective.

[0069] Figure 27 An exploded structure diagram of an end cap assembly of a fourth embodiment of the present application from another perspective.

[0070] Figure 28 A structure diagram of a pole of an embodiment of the present application.

[0071] BRIEF DESCRIPTION OF DRAWINGS

[0072] 100 - energy storage system, 110 - high-voltage cable, 120 - first electric energy conversion device, 130 - second electric energy conversion device, 200 - electric device, 210 - device body, 300 - energy storage device, 310 - shell, 320 - electrode assembly, 321 - positive electrode sheet, 322 - separator, 323 - negative electrode sheet, 330 - accommodation cavity, 340 - first insulating film, 350 - second insulating film, 400 - end cover assembly, 410 - top cover, 411 - first surface, 412 - second surface, 413 - groove, 414 - explosion-proof hole, 420 - upper plastic, 421 - plastic body, 4211 - first side, 4212 - second side, 422 - support portion, 4221 - through hole, 423 - recessed portion, 4231 - bottom plate, 4232 - side plate, 42321 - through hole, 4233 - first reinforcing assembly, 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 segment, 42334b - straight segment, 42335 - sixth reinforcing plate, 4234 - second reinforcing assembly, 42341 - third reinforcing plate, 42342 - fourth reinforcing plate, 424 - protrusion, 424a - first protrusion, 4241a - flow guide surface, 424b - second protrusion, 424b1 - first sub-protrusion, 424b2 - second sub-protrusion, 424c - third protrusion, 430 - explosion-proof assembly, 431 - explosion-proof valve, 432 - protection sheet, 440 - metal compression ring, 440a - positive metal compression ring, 440b - negative metal compression ring, 450 - upper plastic, 460 - pole, 461 - flange portion, 462 - through column, 460a - first pole, 460b - second pole, 470 - sealing ring, 480 - adapter sheet, 480a - positive adapter sheet, 480b - negative adapter sheet, 490 - heat insulation sheet. DETAILED DESCRIPTION

[0073] In order to enable persons skilled in the art to better understand the scheme of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor fall within the scope of protection of the present application.

[0074] The terms "first", "second", etc. in the specification and claims of the present application and in the above drawings are used to distinguish different objects, and are not used to describe a particular order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0075] The technical solutions in the embodiments of the present application will be described below with reference to the drawings.

[0076] It should be noted that, for the sake of illustration, in the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, detailed descriptions of the same parts are omitted in different embodiments.

[0077] Since the energy required by people has strong time and space characteristics, in order to reasonably use energy and improve the utilization rate of energy, it is necessary to store one form of energy in the same form or convert it into another form of energy through a medium or device, and release it in a specific energy form based on future application needs. At present, the main way to generate green electricity is to develop photovoltaic, wind power and other green energy to replace fossil energy.

[0078] At present, the generation of green electricity generally relies on photovoltaic, wind power, water potential, etc., while wind energy and solar energy have strong intermittency and large fluctuation, which can cause instability of the power grid, insufficient electricity at peak demand, and too much electricity at low demand, and unstable voltage can also cause damage to electricity, therefore, due to insufficient electricity demand or insufficient grid acceptance capacity, the problem of "abandoning wind and light" may occur, and to solve these problems, it is necessary to rely on energy storage. That is, the electricity is converted into other forms of energy by physical or chemical means and stored, and the energy is converted into electricity and released when needed. In simple terms, energy storage is similar to a large "power bank", which stores electricity when photovoltaic and wind energy is sufficient, and releases the stored electricity when needed.

[0079] Taking electrochemical energy storage as an example, the present scheme provides an energy storage device applied to an energy storage system, which is provided with a group of chemical batteries inside, mainly using chemical elements in the battery as energy storage medium, and the charging and discharging process is accompanied by chemical reaction or change of the energy storage medium. In simple terms, the electricity generated by wind and solar energy is stored in the chemical battery, and the stored electricity is released for use when the use of external electricity reaches the peak, or transferred to places where electricity is in short supply for use.

[0080] Current energy storage applications are widely used, including energy storage on the power generation side, the power grid side and the power consumption side. The corresponding energy storage devices include:

[0081] (1) Large-scale energy storage power stations applied in wind power and photovoltaic power stations can help renewable energy generation to meet grid connection requirements and improve renewable energy utilization. As high-quality active / reactive power regulation power sources, energy storage power stations can realize load matching in time and space, enhance renewable energy consumption capacity, reduce instantaneous power changes, reduce the impact on the power grid, and improve new energy power generation consumption and have great significance in power grid system backup, peak load power supply pressure relief and peak regulation;

[0082] (2) Energy storage containers applied in the power grid side mainly function in peak regulation, frequency regulation and congestion relief. They can realize peak load shaving and valley filling, i.e., charging energy storage batteries when the power load is low and releasing stored power when the power load is high, so as to balance power production and consumption;

[0083] (3) Small energy storage cabinets applied in the power consumption side mainly function in power self-generation and self-use, peak-valley price arbitrage, capacity cost management and improvement of power supply reliability. According to different application scenarios, power consumption side energy storage can be divided into industrial and commercial energy storage cabinets, household energy storage devices and energy storage charging piles, which are generally used with distributed photovoltaic power. Industrial and commercial users can use energy storage for peak-valley price arbitrage and capacity cost management. In the electricity market implementing peak-valley electricity price, the energy storage system is charged at low price and discharged at high price to realize peak-valley price arbitrage and reduce electricity cost. In addition, industrial enterprises using two-part electricity prices can use the energy storage system to store energy at low power consumption and discharge at high peak load, thereby reducing the maximum demand amount and achieving the purpose of reducing capacity electricity cost. Household photovoltaic power with storage can improve the level of power self-generation and self-use. Due to high electricity prices and poor power supply stability, household photovoltaic power demand is driven. Considering that photovoltaic power is generated during the day and users generally have high load at night, the configuration of energy storage can better utilize photovoltaic power and improve the level of self-generation and self-use while reducing electricity cost. In addition, communication base stations and data centers need to configure energy storage for backup power.

[0084] In some embodiments, referring to Figure 1 , Figure 1 is a structural schematic diagram of an energy storage system 100 according to an embodiment of the present application, and the present application Figure 1 embodiments are described by taking the shared energy storage scenario on the power generation and distribution side as an example. The energy storage device 300 of the present application is not limited to the energy storage scenario on the power generation and distribution side.

[0085] The application provides a kind of energy storage system 100, the energy storage system 100 includes: high voltage cable 110, first electric energy conversion device 120, second electric energy conversion device 130 and the energy storage device 300 provided by the application, in some embodiments of power generation side scene, second electric energy conversion device 130 can be wind power electric energy conversion device, due to the fluctuation, randomness and intermittence of wind power electric energy conversion generated electric energy, unstable electric energy output by wind power electric energy conversion device can be stored to energy storage device 300 by grid connection first, energy storage device 300 is connected with high voltage cable 110 and exports smooth electric energy to supply distribution network for use, realize peak shaving and frequency modulation, grid stable operation;Or, wind power electric energy conversion device is always connected with high voltage cable 110, and the electric energy output by wind power electric energy conversion device is supplied to distribution network for use by high voltage cable 110 under ordinary power generation condition, and when current power load is low, wind power electric energy conversion device generates excess, first store the electric quantity of overproduction to energy storage device 300, reduce the rate of abandoned wind and light, improve new energy power generation consumption problem;And when power load is high, grid issues an order, and the electric quantity stored in energy storage device 300 is transmitted to power side for use by grid connection mode with high voltage cable 110, provides peak shaving, frequency modulation, backup and other services for grid operation, fully plays the role of grid peak shaving, promotes grid peak clipping, and relieves grid power supply pressure.

[0086] In some embodiments of distribution network side, first electric energy conversion device 120 can be photovoltaic electric energy conversion device, energy storage device 300 is connected with high voltage cable 110 and is installed between downstream of high voltage cable 110 and user load, and the electric energy output by photovoltaic electric energy conversion device is stored in energy storage device 300, which can be used as backup power source in time when grid / distribution network fails;Or, when high voltage cable 110 transmission line appears line congestion, it can relieve line congestion and provide power supply support to delay economic pressure generated by grid / distribution expansion.

[0087] Optionally, first electric energy conversion device 120 can include but is not limited to wind power electric energy conversion device, and second electric energy conversion device 130 can include but is not limited to photovoltaic electric energy conversion device, and the first electric energy conversion device 120 and the second electric energy conversion device 130 can convert at least one of solar energy, light energy, wind energy, heat energy, tidal energy, biomass energy and mechanical energy into electric energy.

[0088] Optionally, energy storage device 300 can include but is not limited to energy storage application scenarios such as energy storage power station, hydraulic / thermal / wind power generation system, solar power generation system, mobile power system, smart home system or temporary power supply system, and is also applied to data center, military equipment, aerospace, charging pile, electric vehicle and other fields.

[0089] Please refer to Figure 2The power utilization device 200 can be, but is not limited to, at least one of a power grid, a base station, and the like.

[0090] Optionally, the power utilization device 200 can be, but is not limited to, at least one of a power grid, a base station, and the like.

[0091] Optionally, the power utilization device 200 and the energy storage device can be electrically connected through the high-voltage cable 110.

[0092] Optionally, the energy storage device 300 can include a battery module, a battery pack, a battery cluster, a mobile power supply, an energy storage cabinet / energy storage prefabricated cabin, and the like battery integrated system composed of single batteries. The actual application form of the energy storage device 300 provided in the embodiments of the present application can be, but is not limited to, the listed products, and can also be other application forms. The embodiments of the present application do not strictly limit the application form of the energy storage device 300.

[0093] Optionally, the single battery can be, but is not limited to, at least one of a cylindrical battery, a square battery, a prismatic battery, or other shaped batteries.

[0094] Optionally, the single battery can be a secondary battery, which refers to a single battery that can be activated by charging after discharging. The single battery can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, and the like. The present application does not make specific limitations.

[0095] Please refer to Figure 3 , Figure 3 The structure of the energy storage device 300 according to an embodiment of the present application is shown in the figure.

[0096] In some embodiments, when the energy storage device 300 is a battery pack, a battery cluster, a mobile power supply, an energy storage cabinet / energy storage prefabricated cabin, and the like battery integrated system, the energy storage device 300 can include, but is not limited to, one or more single batteries. When the energy storage device 300 includes multiple single batteries, the multiple single batteries can be connected in series, in parallel, or in a hybrid manner.

[0097] The term "multiple" means greater than or equal to two, for example, can be, but is not limited to, 2, 5, 10, 30, 50, 100, 200, 300, 400, 800, 1000, and the like. The number of single batteries included in the energy storage device 300 can be determined according to the rated capacity of the single battery and the rated capacity to be achieved by the energy storage device 300.

[0098] In order to avoid short circuit caused by direct contact between the cell (or referred to as bare cell, electrode assembly) and the metal shell, an insulating film (Mylar film) is usually arranged between the cell and the metal shell. In order to make the end cover assembly and the cell have better integrity, be easier to assemble and improve the structural strength, the insulating film is usually bonded with the lower plastic of the end cover assembly. During the process of battery assembly, transportation and use, the insulating film will pull the lower plastic along the direction of gravity, so that the lower plastic is deformed, thereby causing a series of safety problems.

[0099] Figure 4 Structure schematic diagram of the energy storage device 300 of another embodiment of the present application. Figure 5 The energy storage device 300 of the embodiment of the present application Figure 4 Structure schematic diagram of the energy storage device 300 of another embodiment of the present application.

[0100] Please refer to Figure 4 and Figure 5 The energy storage device 300 of the embodiment of the present application further comprises a shell 310, an end cover assembly 400, an electrode assembly 320 and an electrolyte. The end cover assembly 400 and the shell 310 enclose a receiving cavity 330. The electrode assembly 320 is arranged in the receiving cavity 330, and the electrode assembly 320 is electrically connected with the end cover assembly 400. The electrolyte is arranged in the receiving cavity 330.

[0101] It should be noted that the electrolyte at least wets part of the electrode assembly 320.

[0102] Figure 6 Structure schematic diagram of the electrode assembly 320 of the energy storage device 300 of the embodiment of the present application. Please refer to Figure 6 Optionally, the electrode assembly 320 comprises a positive electrode sheet 321, a separator 322 and a negative electrode sheet 323. The positive electrode sheet 321 and the negative electrode sheet 323 are respectively located on the opposite sides of the separator 322. That is, the separator 322 is located between the positive electrode sheet 321 and the negative electrode sheet 323, and separates the positive electrode sheet 321 and the negative electrode sheet 323. It should be noted that the positive electrode sheet 321, the separator 322 and the negative electrode sheet 323 are at least partially immersed in the electrolyte.

[0103] Optionally, the energy storage device 300 further comprises a first insulating film 340 (Mylar film), which is arranged between the shell 310 and the electrode assembly 320, and is used for insulating the shell 310 and the electrode assembly 320. The first insulating film 340 is connected with the end cover assembly 400.

[0104] It should be noted that the first insulating film 340 has electrolyte inside, and between the first insulating film 340 and the shell 310.

[0105] Optionally, the energy storage device 300 further comprises a second insulating film 350 (also referred to as insulating blue film), which is arranged on the outer periphery of the shell 310, and is used for insulating the outer surface of the shell 310.

[0106] Figure 7 The structure diagram of the end cover assembly 400 of an embodiment of the present application. Figure 8 The structure diagram of the end cover assembly 400 of an embodiment of the present application. Figure 9 The structure diagram of the end cover assembly 400 of an embodiment of the present application.

[0107] Please refer to Figure 7 to Figure 9 The end cover assembly 400 of the embodiment of the present application further comprises a top cover 410 and a lower plastic 420. The top cover 410 has a first surface 411 and a second surface 412 arranged oppositely. The top cover 410 further has a groove 413, which is located on the second surface 412. The lower plastic 420 is arranged on the second surface 412 of the top cover 410. The lower plastic 420 comprises a plastic body 421 and a protruding column 424. The protruding column 424 is protruded from one side of the plastic body 421 facing the top cover 410. The protruding column 424 is accommodated in the groove 413 and connected with the top cover 410.

[0108] It can be understood that the first surface 411 is arranged away from the lower plastic 420, and the second surface 412 is arranged to face the lower plastic 420.

[0109] Optionally, the groove 413 penetrates through the second surface 412 but not the first surface 411, in other words, the groove 413 is a blind groove.

[0110] Optionally, the number of the groove 413 can be one or more. When the number of the groove 413 is more than one, the grooves 413 are arranged at intervals on the second surface 412. Specifically, the number of the groove 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 “more than one” means greater than or equal to two.

[0111] Optionally, the number of the protruding posts 424 can be one or more, and when the number of the protruding posts 424 is more than one, the plurality of protruding posts 424 are arranged at intervals on the side of the plastic body facing the top cover. Specifically, the number of the protruding posts 424 can be, but is not limited to, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, and the like.

[0112] Optionally, the number of the protruding posts 424 is equal to the number of the recesses 413, and the protruding posts 424 correspond to the recesses 413 one by one.

[0113] It should be noted that the protruding posts 424 correspond to the recesses 413 one by one, which can be understood as that one protruding post 424 is arranged in one recess 413, and different protruding posts are arranged in different recesses 413.

[0114] Optionally, the plastic body 421 and the protruding posts 424 are an integral structure, in other words, the plastic body 421 and the protruding posts 424 are different parts of the same component. The plastic body 421 and the protruding posts 424 can be integrally injection molded and manufactured in the same process.

[0115] In some embodiments, the lower plastic 420 is one component, and the lower plastic 420 is prepared by integrally injection molding.

[0116] It can be understood that the top cover 410 and the lower plastic 420 are arranged in a stacked manner along the thickness direction of the plastic body 421.

[0117] Optionally, the lower plastic 420 and the top cover 410 are connected through the protruding posts 424. In some embodiments, the protruding posts 424 and the recesses 413 are connected through interference fit to connect the top cover 410 and the lower plastic 420. In other embodiments, an adhesive is arranged between the protruding posts 424 and the recesses 413 to connect the top cover 410 and the lower plastic 420. In yet other embodiments, the protruding posts 424 of the lower plastic 420 and the top cover 410 are connected by hot melting the protruding posts 424 to bond the protruding posts 424 to the top cover 410.

[0118] Optionally, the lower plastic 420 is connected to the first insulating film 340. Optionally, the first insulating film 340 is bonded to the lower plastic 420 at opposite ends along the length direction of the plastic body 421 by hot melting.

[0119] 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.

[0120] 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.

[0121] Please see Figure 10 to Figure 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.

[0122] The first reinforcing assembly 4233 includes a first reinforcing plate 42331 and a second reinforcing plate 42332, both of which are arranged on the surface of the bottom plate 4231 facing the top cover 410 and on the side of the side plate 4232 away from the support portion 422, the first reinforcing plate 42331 and the second reinforcing plate 42332 are arranged along the width direction of the lower plastic 420, and both of them extend along the length direction of the lower plastic 420, the first reinforcing plate 42331 is closer to the preset central axis than the second reinforcing plate 42332, and the bottom plate 4231, the side plate 4232, the first reinforcing plate 42331 and the second reinforcing plate 42332 form a flow-through channel 42333, which penetrates the side plate 4232 to make the flow-through channel 42333 communicate with the side of the support portion 422 away from the top cover 410.

[0123] It should be noted that the length direction of the plastic body 421 is larger than the width direction of the plastic body 421. The width direction of the plastic body 421 is larger than the thickness direction (such as Figure 10 indicated by double arrow Z) of the plastic body 421.

[0124] It should be noted that the flow-through channel 42333 penetrates the side plate 4232, which can be understood as that the side plate 4232 has a through hole 42321 (such as Figure 11 indicated), which communicates the flow-through channel 42333 and the side of the support portion 422 away from the top cover 410.

[0125] It can be understood that the bottom plate 4231, the side plate 4232, the first reinforcing plate 42331, the second reinforcing plate 42332 and the support portion 422 are an integral structure.

[0126] When the energy storage device 300 is in thermal runaway or electrochemical reaction, the airflow generated inside the energy storage device 300 flows into the flow-through channel 42333 from the end of the flow-through channel 42333 away from the support portion 422, and then flows into the side of the support portion 422 away from the top cover 410 from the through hole 42321 of the side plate 4232.

[0127] It can be understood that the recessed portion 423 and the support portion 422 are arranged along the length direction of the plastic body 421.

[0128] Optionally, the number of recessed portions 423 can be one or two, and when the number of recessed portions 423 is two, the two recessed portions 423 are arranged on the opposite sides of the support portion 422 along the length direction of the plastic body 421.

[0129] Optionally, the surface of the recess 423 facing the top cover 410 is flush or coplanar with the surface of the support portion 422 facing the top cover 410. In this way, the surface of the plastic body 421 facing the top cover 410 is overall flat, which can better fit the second surface 412 of the top cover 410.

[0130] Optionally, the surface of the first reinforcing plate 42331 facing the top cover 410, the surface of the second reinforcing plate 42332 facing the top cover 410, and the surface of the support portion 422 facing the top cover 410 are flush or coplanar. In this way, the surface of the plastic body 421 facing the top cover 410 is overall flat, which can better fit the second surface 412 of the top cover 410.

[0131] In other words, the second reinforcing plate 42332 is closer to the first side surface 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 middle position of the recess 423 (for example, a preset middle axis of the plastic body 421 parallel to the length direction, as shown by the dashed line O-O) than the second reinforcing plate 42332. Figure 12

[0132] In a specific example, the bottom plate 4231 is parallel to the support portion 422, and the bottom plate 4231 and the support portion 422 are both perpendicular to the side plate 4232.

[0133] It should be noted that the bottom plate 4231 protrudes from the support portion 422 in a direction away from the top cover 410. It can be understood that the surface of the recess 423 away from the top cover 410 protrudes from the surface of the support portion 422 away from the top cover 410.

[0134] It should be noted that the recess 423 is used for the first insulating film 340 of the heat melting energy storage device 300, that is, the recess 423 is connected with the first insulating film 340.

[0135] 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 can also have a certain angle.

[0136] Please refer to Figure 8 and Figure 9 ​Optionally, the top cover 410 has an explosion-proof hole 414 penetrating through the first surface 411 and the second surface 412 respectively, and the support portion 422 has a plurality of through holes 4221 (e.g. fence holes) arranged at intervals; the through holes 4221 penetrate through 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 hole 414 at least partially overlap or stack; 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 hole 414 on the second surface 412 at least partially stack. The through holes 4221 are used to discharge the gas generated in the energy storage device 300 to the explosion-proof hole 414 through the through holes 4221 when the energy storage device 300 is in thermal runaway or in electrochemical reaction, and to cause explosion and pressure relief through the explosion-proof hole 414, thereby improving the safety of the energy storage device 300 in use.

[0137] Please refer to Figure 8 and Figure 9 Optionally, the end cover assembly 400 further comprises an explosion-proof assembly 430, which comprises an explosion-proof valve 431 and a protective sheet 432; the explosion-proof valve 431 and the protective sheet 432 are arranged at intervals in the explosion-proof hole 414 and are connected to the top cover 410 respectively, and the explosion-proof valve 431 is arranged closer to the lower plastic 420 than the protective sheet 432. It can be understood that 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 at least partially stack. The explosion-proof valve 431 is provided with a notch (not shown in the figure) for timely explosion of the explosion-proof valve 431 when the gas pressure in the energy storage device 300 reaches a preset value due to thermal runaway or electrochemical reaction of the energy storage device 300, thereby performing pressure relief and improving the safety of the energy storage device 300 in use. The protective sheet 432 is used to protect the explosion-proof valve 431 to avoid the explosion-proof valve 431 being pierced when the explosion-proof valve 431 does not reach the explosion condition.

[0138] In the present embodiment, the flow passage 42333 is arranged in the recessed portion 423, and the flow passage 42333 communicates with the side of the support portion 422 facing away from the top cover 410, so that the plurality of through holes 4221 of the support portion 422 can be communicated. When the energy storage device 300 is in thermal runaway or electrochemical reaction, part of the gas generated in the energy storage device 300 flows to the surface of the support portion 422 facing away from the top cover 410 through the flow passage 42333, so that the gas can be branched, dispersed and balanced, the pressure inside the energy storage device 300 is reduced, the pressure on the explosion-proof assembly 430 on the top cover 410 is reduced, and the safety of the energy storage device 300 is improved. In addition, the edges of the flow passage 42333 are provided with the first reinforcing plate 42331 and the second reinforcing plate 42332, so that not only the strength of the recessed portion 423 can be improved, but also the recessed portion 423 can better support the first insulating film 340, better prevent the deformation of the lower plastic 420, improve the safety of the energy storage device 300, and better reduce the weight of the lower plastic 420, and reduce the weight of the energy storage device 300.

[0139] Please refer again to Figure 12 and Figure 13 In some embodiments, the recessed portion 423 includes two first reinforcing assemblies 4233, the two first reinforcing assemblies 4233 are arranged in the width direction of the plastic body 421, the flow passage 42333 includes a first flow passage 42333a and a second flow passage 42333b, one of the two first reinforcing assemblies 4233 has the first flow passage 42333a, and the other of the two first reinforcing assemblies 4233 has the second flow passage 42333b, the first flow passage 42333a has a first central axis (such as Figure 12 dashed line MM), the second flow passage 42333b has a second central axis (such as Figure 12 dashed line NN), and the first central axis and the second central axis are parallel to the length direction.

[0140] The number of the convex columns 424 is a plurality, and part of the plurality of convex columns 424 is located on both sides of the first central axis, and part of the plurality of convex columns 424 is located on both sides of the second central axis.

[0141] In the embodiment, by arranging two first reinforcing components 4233, a part of the convex columns 424 are located on both sides of the first central axis, and a part of the plurality of convex columns 424 are located on both sides of the second central axis. The strength of each position of the recessed part 423 can be balanced, and the overall strength is high. In addition, by arranging the second reinforcing component 4234, the first insulating film 340 can be better supported, and when the recessed part 423 is pulled by the first insulating film 340, the stress of the recessed part 423 can be better dispersed, the deformation of the lower plastic 420 is avoided, and the safety of the energy storage device 300 is improved.

[0142] Please refer again to Figure 12 and Figure 13 In some embodiments, along the thickness direction of the top cover 410, the convex column 424 protrudes towards the top cover 410 from the first reinforcing component 4233.

[0143] It can be understood that the convex column 424 protrudes towards the top cover 410 from the first reinforcing plate 42331 and the second reinforcing plate 42332.

[0144] In the embodiment, the convex column 424 protrudes towards the top cover 410 from the first reinforcing component 4233. In this way, the convex column 424 and the groove 413 can be better matched and connected, the connection strength of the lower plastic 420 and the top cover 410 is improved, the recessed part 423 is better supported, the collapse of the flow passage 42333 is prevented, and the safety of the energy storage device 300 is improved.

[0145] Please refer to Figure 13 In some embodiments, the number of convex columns 424 is a plurality, the number of grooves 413 is a plurality, the convex columns 424 are correspondingly arranged with the grooves 413, the plurality of convex columns 424 include a first convex column 424a, the first convex column 424a is arranged on the surface of the bottom plate 4231 facing the top cover 410, the first convex column 424a is connected with the first reinforcing plate 42331 and protrudes towards the flow passage 42333 compared with the first reinforcing plate 42331.

[0146] It can be understood that the first convex column 424a protrudes towards the direction close to the second reinforcing plate 42332 compared with the first reinforcing plate 42331.

[0147] It can be understood that the first convex column 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 convex column 424a is greater than the height of the first reinforcing plate 42331. It can also be understood that the first convex column 424a protrudes from the surface of the plastic body 421 facing the top cover 410.

[0148] Optionally, the radial dimension of the first protruding column 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). In this way, not only can the connection strength of the first protruding column 424a and the top cover 410 be improved, but the recessed portion 423 can also be better supported, and the first protruding column 424a can better protrude in the direction of the flow passage 42333, so as to better disturb the airflow flowing through the flow passage 42333 and balance the air pressure in the flow passage 42333. In addition, the first protruding column 424a is arranged on one side of the flow passage 42333, and when the energy storage device 300 is in thermal runaway or electrochemical reaction, the first protruding column 424a can better support the top cover 410 and prevent the flow passage 42333 from collapsing, thereby improving the safety of the energy storage device 300 in use.

[0149] In the present embodiment, the first protruding column 424a is arranged on the first reinforcing plate 42331 and protrudes from the flow passage 42333. The first reinforcing plate 42331 is connected with the first protruding column 424a, which not only improves the strength of the first reinforcing plate 42331, but also improves the strength of the first protruding column 424a, so as to make the connection between the recessed portion 423 and the top cover 410 more stable. In addition, the first protruding column 424a protrudes from the flow passage 42333, so as to disturb the airflow in the flow passage 42333 and better balance the air pressure in the flow passage 42333, thereby improving the safety of the energy storage device 300 in use.

[0150] Please refer again to Figure 12 and Figure 13 In some embodiments, the plastic body 421 has a preset central axis parallel to the length direction (as shown by the dashed line O-O in FIG. 4B), and the first reinforcing plate 42331 and the first protruding column 424a are both located on the same side of the preset central axis. Figure 12 It can be understood that when the first reinforcing assembly 4233 is a plurality of groups, the first protruding column 424a close to each group of the first reinforcing assembly 4233 and the first reinforcing plate 42331 of the first reinforcing assembly 4233 are located on the same side of the preset central axis.

[0151] Optionally, the first reinforcing plate 42331 and the first protruding column 424a are both arranged close to the preset central axis.

[0152]

[0153] ​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.

[0154] 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.

[0155] Optionally, the guide surface 4241a can be, but is not limited to, at least one of a cylindrical arc surface, an inclined surface, etc.

[0156] 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.

[0157] 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.

[0158] 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 of the top cover 410.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] In the embodiment, a part of the plurality of convex columns 424 are located on the same straight line, and the straight line is parallel to the width direction of the plastic body 421. In this way, the connection strength of the lower plastic 420 and the top cover 410 can be improved, when the lower plastic 420 is connected with the first insulating film 340, the tensile force of the first insulating film 340 on the lower plastic 420 can be better dispersed, the deformation of the lower plastic 420 can be better avoided, the short circuit between the positive electrode tab 321 and the negative electrode tab 323 can be better avoided, the generation of safety hazards can be better avoided, and the safety of the energy storage device 300 can be better improved.

[0163] Please refer again to Figure 12 and Figure 13 In some embodiments, the recessed part 423 further comprises a second reinforcing assembly 4234, the second reinforcing assembly 4234 is arranged on the same side of the bottom plate 4231 as the first reinforcing assembly 4233, the second reinforcing assembly 4234 comprises a third reinforcing plate 42341, the third reinforcing plate 42341 is located on the side of the side plate 4232 away from the support part 422, and is arranged spaced apart from the side plate 4232 along the length direction, and the third reinforcing plate 42341 is connected to the first reinforcing plate 42331.

[0164] In the embodiment, by arranging the third reinforcing plate 42341, the strength of the recessed part 423 can be improved, the third reinforcing plate 42341 is used for hot melt bonding the first insulating film 340, the bonding area of the first insulating film 340 and the recessed part 423 can be improved, and the connection strength of the first insulating film 340 and the recessed part 423 can be improved.

[0165] Please refer again to Figure 12 and Figure 13 In some embodiments, the plastic body 421 has a preset central axis parallel to the length direction, the recessed part 423 comprises at least two first reinforcing assemblies 4233, the at least two first reinforcing assemblies 4233 are arranged spaced apart along the width direction of the plastic body 421, and along the width direction, the at least two first reinforcing assemblies 4233 are symmetrically arranged relative to the preset central axis; the recessed part 423 further comprises a second reinforcing assembly 4234, the second reinforcing assembly 4234 is arranged on the same side of the bottom plate 4231 as the first reinforcing assembly 4233, and the second reinforcing assembly 4234 is located between the two adjacent first reinforcing assemblies 4233 and connects the first reinforcing plates 42331 of the two first reinforcing assemblies 4233, respectively.

[0166] It should be noted that the second reinforcing assembly 4234 is connected with the first insulating film 340. It can be understood that the bottom plate 4231, the side plate 4232, the first reinforcing assembly 4233 and the second reinforcing assembly 4234 are an integral structure.

[0167] It can be understood that the number of the second reinforcing components 4234 is at least one. One of the second reinforcing components 4234 is arranged between two adjacent first reinforcing components 4233.

[0168] In the embodiment, by arranging two first reinforcing components 4233 and a second reinforcing component 4234, and arranging the two first reinforcing components 4233 symmetrically along the preset middle axis, the strength of each position of the recessed part 423 can be balanced, and the overall strength is high. In addition, by arranging the second reinforcing component 4234, the first insulating film 340 can be better supported, and when the recessed part 423 is pulled by the first insulating film 340, the stress of the recessed part 423 can be better dispersed, the deformation of the lower plastic 420 can be avoided, and the safety of the energy storage device 300 is improved.

[0169] Please refer again to 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 part 422, and is arranged 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 sides of the two first reinforcing plates 42331 of the two first reinforcing components 4233 away from the support part 422.

[0170] Optionally, the third reinforcing plate 42341 is symmetrical along the preset middle axis.

[0171] It can be understood that the third reinforcing plate 42341 extends along the width direction of the plastic body 421, and the third reinforcing plate 42341 is arranged close to the preset middle axis parallel to the length direction of the plastic body 421.

[0172] Optionally, the third reinforcing plate 42341 is arranged spaced apart from the side plate 4232.

[0173] 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 away from the side plate 4232 is used to connect the first insulating film 340 of the energy storage device 300.

[0174] It should be noted that the surface of the third reinforcing plate 42341 away from the support part 422 serves as part of the end face or side face of the lower plastic 420 along the length direction.

[0175] In the embodiment, by arranging the third reinforcing plate 42341, the strength of the recessed part 423 can be improved, and the third reinforcing plate 42341 is used for hot melt bonding of the first insulating film 340, which can increase the bonding area of the first insulating film 340 and the recessed part 423, and improve the connection strength of the first insulating film 340 and the recessed part 423.

[0176] Referring again to Figure 13 In some embodiments, the second reinforcing assembly 4234 further comprises a fourth reinforcing plate 42342, opposite ends of the fourth reinforcing plate 42342 are connected to the third reinforcing plate 42341 and the side plate 4232 respectively.

[0177] Understandably, in the present embodiment, the second reinforcing assembly 4234 comprises the third reinforcing plate 42341 and the fourth reinforcing plate 42342.

[0178] Optionally, when the recess 423 comprises two first reinforcing assemblies 4233, the fourth reinforcing plate 42342 is located between two first reinforcing plates 42331 of two adjacent first reinforcing assemblies 4233.

[0179] Understandably, the fourth reinforcing plate 42342 is further connected to the bottom plate 4231.

[0180] Understandably, the fourth reinforcing plate 42342 extends along the length direction of the plastic body 421. Optionally, the first reinforcing plate 42331, the second reinforcing plate 42332, and the fourth reinforcing plate 42342 are parallel to the preset central axis. In a specific embodiment, the fourth reinforcing plate 42342 is located on the preset central axis.

[0181] In the present embodiment, the second reinforcing assembly 4234 comprises the fourth reinforcing plate 42342, through which the third reinforcing plate 42341 can be better stabilized, and the third reinforcing plate 42341 can be better prevented from being pulled by the first insulating film 340 and deformed, thereby improving the safety of the energy storage device 300 in use.

[0182] Referring again to Figure 12 and Figure 13 In some embodiments, the plurality of protruding columns 424 further comprises a second protruding column 424b, the second protruding column 424b is arranged on the surface of the bottom plate 4231 facing the top cover 410.

[0183] In the present embodiment, by arranging the second protruding column 424b, the connection strength of the edge position of the recess 423 and the edge position of the top cover 410 can be better strengthened, the structural strength of the recess 423 is improved, and the bottom plastic 420 can be better prevented from being pulled by the first insulating film 340 and deformed, thereby improving the safety of the energy storage device 300 in use.

[0184] In some embodiments, the second protruding column 424b is located on the side of the second reinforcing plate 42332 away from the first reinforcing plate 42331.

[0185] It can be understood that the second protruding column 424b is closer to the first side surface 4211 than the second reinforcing plate 42332. It can also be understood that in this embodiment, the second protruding column 424b is located between the second reinforcing plate 42332 and the first side surface 4211.

[0186] It can be understood that the second protruding column 424b also protrudes from the surface of the second reinforcing plate 42332 facing the top cover 410. In other words, in the thickness direction of the plastic body 421, the height of the second protruding column 424b is greater than the height of the second reinforcing plate 42332. It can also be understood that the second protruding column 424b protrudes from the surface of the plastic body 421 facing the top cover 410.

[0187] It can be understood that the first protruding column 424a and the second protruding column 424b are respectively located on opposite sides of the flow-through channel 42333.

[0188] In some embodiments, the recessed portion 423 is provided with two first protruding columns 424a and two second protruding columns 424b, that is, the recessed portion 423 is provided with four protruding columns 424. The two first protruding columns 424a and the two second protruding columns 424b are sequentially and spaced apart in a direction parallel to the width direction. In other words, the two first protruding columns 424a and the two second protruding columns 424b are arranged on the same straight line.

[0189] In this embodiment, by providing the second protruding column 424b and locating the second protruding column 424b on the side of the second reinforcing plate 42332 away from the first reinforcing plate 42331, the connection strength of the edge position of the recessed portion 423 and the edge position of the top cover 410 can be better strengthened, the structural strength of the recessed portion 423 can be improved, and the deformation of the lower plastic 420 caused by being pulled by the first insulating film 340 can be better prevented, thereby improving the safety of the energy storage device 300 in use. In addition, the second protruding column 424b is arranged on the other side of the flow-through channel 42333, and when the energy storage device 300 is in thermal runaway or electrochemical reaction, the second protruding column 424b can better support the top cover 410 to prevent the flow-through channel 42333 from collapsing, thereby improving the safety of the energy storage device 300 in use.

[0190] Figure 14 A structural schematic diagram of the lower plastic 420 of the second embodiment of the present application. Figure 15 A plan view of the lower plastic 420 of the second embodiment of the present application. Figure 14 A structural schematic diagram of the lower plastic 420 of the third embodiment of the present application. Figure 16 A plan view of the lower plastic 420 of the third embodiment of the present application. Figure 17 A structural schematic diagram of the lower plastic 420 of the fourth embodiment of the present application. Figure 16 A plan view of the lower plastic 420 of the fourth embodiment of the present application. Figure 18 A structural schematic diagram of the lower plastic 420 of the fourth embodiment of the present application. Figure 19 A plan view of the lower plastic 420 of the fourth embodiment of the present application.Figure 18 A plan view of the lower plastic 420 of the embodiment.

[0191] Please refer to Figure 14 to Figure 19 In some embodiments, the plurality of protruding columns 424 further comprises a second protruding column 424b disposed on the surface of the bottom plate 4231 facing the top cover 410; the second protruding column 424b is connected with the second reinforcing plate 42332, and the second protruding column 424b protrudes towards the flow passage 42333 compared with the second reinforcing plate 42332.

[0192] It can be understood that the second protruding column 424b protrudes towards the direction close to the first reinforcing plate 42331 compared with the second reinforcing plate 42332.

[0193] Optionally, the radial dimension of the second protruding column 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). In this way, not only can the connection strength of the second protruding column 424b and the top cover 410 be improved, but also the recessed part 423 can be better supported, and the second protruding column 424b can be better protruded towards the direction of the flow passage 42333, so as to better disturb the airflow flowing through the flow passage 42333 and balance the air pressure in the flow passage 42333.

[0194] In the embodiment, by disposing the second protruding column 424b on the second reinforcing plate 42332 and making the second protruding column 424b protrude from the flow passage 42333. The second reinforcing plate 42332 is connected with the second protruding column 424b, which not only can improve the strength of the second reinforcing plate 42332, but also can improve the strength of the second protruding column 424b, so as to make the connection of the recessed part 423 and the top cover 410 more stable; in addition, the second protruding column 424b protrudes from the flow passage 42333, so as to disturb the airflow in the flow passage 42333 and better balance the air pressure in the flow passage 42333, thereby improving the safety of the energy storage device 300.

[0195] Please refer to Figure 13 In some embodiments, a part of the third reinforcing plate 42341 protrudes towards the flow passage 42333.

[0196] It can be understood that the other part of the third reinforcing plate 42341 is disposed away from the flow passage 42333.

[0197] In the present embodiment, the third reinforcing plate 42341 protrudes towards the flow passage 42333 on one side and is staggered with the flow passage 42333 on the other side. In this way, the area of the third reinforcing plate 42341 that is fused to the first insulating film 340 is increased, and the connection strength between the third reinforcing plate 42341 and the first insulating film 340 is improved. In addition, the strength of the recessed portion 423 is also improved, and the deformation of the lower plastic 420 is better prevented. Furthermore, when the energy storage device 300 undergoes thermal runaway or electrochemical reaction, the position of the flow passage 42333 close to the preset central axis has a greater air flow than the position away from the preset central axis (i.e., the position close to the first side surface 4211), which can increase the flow disturbance to the position of the flow passage 42333 close to the preset central axis, balance the air pressure in the flow passage 42333, and improve the safety of the energy storage device 300.

[0198] Please refer to Figure 12 to Figure 19 In some other embodiments, the plurality of protruding columns 424 includes a first protruding column 424a arranged on the surface of the bottom plate 4231 facing the top cover 410, the first protruding column 424a is connected to the first reinforcing plate 42331 and protrudes towards the flow passage 42333 more than the first reinforcing plate 42331; the third reinforcing plate 42341 protrudes from the flow passage 42333 by a width greater than that of the first protruding column 424a.

[0199] In the present embodiment, the third reinforcing plate 42341 protrudes from the flow passage 42333 by a width greater than that of the first protruding column 424a. The third reinforcing plate 42341 is closer to the inlet of the flow passage 42333 than the first protruding column 424a. When the battery undergoes thermal runaway or electrochemical reaction, the protruding portion of the third reinforcing plate 42341 can better disturb the air flow to the position of the flow passage 42333 close to the second reinforcing plate 42332, and play a better flow disturbance effect. When the air flow enters the flow passage 42333, it is disturbed again by the first protruding column 424a, which can better balance the air pressure in the flow passage 42333 and improve the safety of the energy storage device 300.

[0200] Please refer to Figure 13 , Figure 14 , Figure 16 and Figure 18In some other embodiments, the first reinforcing assembly 4233 further comprises a fifth reinforcing plate 42334, which is protruded from the surface of the bottom plate 4231 facing the top cover 410, and is located at the side of the second reinforcing plate 42332 away from the first reinforcing plate 42331. The opposite ends of the fifth reinforcing plate 42334 are connected to the second reinforcing plate 42332 and the side plate 4232 respectively.

[0201] It should be noted that the surface of the fifth reinforcing plate 42334 away from the second reinforcing plate 42332 is part of the side of the recess 423. Part of the surface of the fifth reinforcing plate 42334 away from the second reinforcing plate 42332 is part of the first side 4211.

[0202] It can be understood that, in the present embodiment, at least part of the first reinforcing assembly 4233 on the recess 423 comprises the first reinforcing plate 42331, the second reinforcing plate 42332 and the fifth reinforcing plate 42334.

[0203] Optionally, the fifth reinforcing plate 42334 is partially arc-shaped and partially planar. As shown in Figure 13 It can be understood that the fifth reinforcing plate 42334 comprises an arc-shaped segment 42334a and a planar segment 42334b connected to each other, the arc-shaped segment 42334a is connected to the second reinforcing plate 42332, and the planar segment 42334b is connected to the side plate 4232.

[0204] In the present embodiment, by means of the fifth reinforcing plate 42334, and by connecting the opposite ends of the fifth reinforcing plate 42334 to the second reinforcing plate 42332 and the side plate 4232 respectively, the strength of the second reinforcing plate 42332 and the side plate 4232 can be improved, thereby improving the strength of the recess 423. When the second protruding column 424b is connected to the second reinforcing plate 42332, the strength of the second protruding column 424b can also be improved, the connection strength between the lower plastic 420 and the top cover 410 is improved, the deformation of the lower plastic 420 is better prevented, and the safety of the energy storage device 300 is improved.

[0205] Please refer to Figure 13 , Figure 18 , and Figure 20 In some other embodiments, the first reinforcing assembly 4233 further comprises a sixth reinforcing plate 42335, which is protruded from the surface of the bottom plate 4231 facing the top cover 410, and is located at the side of the second reinforcing plate 42332 away from the first reinforcing plate 42331. The fifth reinforcing plate 42334 and the sixth reinforcing plate 42335 are connected.

[0206] It can be understood that, in the embodiment, the at least partial first reinforcing assembly 4233 of the recess 423 includes the first reinforcing plate 42331, the second reinforcing plate 42332, the fifth reinforcing plate 42334, and the sixth reinforcing plate 42335.

[0207] Optionally, the number of the sixth reinforcing plate 42335 can be one or more, such as Figure 20 As shown, when the number of the sixth reinforcing plate 42335 is more than one, the multiple sixth reinforcing plates 42335 can be arranged at intervals or connected.

[0208] In the embodiment, by arranging the fifth reinforcing plate 42334 and the sixth reinforcing plate 42335, the strength of the recess 423 can be improved, so that the recess 423 can better support the first insulating film 340 and better prevent the deformation of the lower plastic 420, thereby improving the safety of the energy storage device 300.

[0209] Please refer to Figure 14 and Figure 15 again, the number of the recess 423 is two, and the two recesses 423 are respectively located at opposite ends of the support portion 422. The first reinforcing assembly 4233 of one of the two recesses 423 includes the sixth reinforcing plate 42335.

[0210] It can be understood that the first reinforcing assembly 4233 of the other of the two recesses 423 does not include the sixth reinforcing plate 42335.

[0211] It can also be understood that the first reinforcing assembly 4233 of one of the two recesses 423 includes the first reinforcing plate 42331, the second reinforcing plate 42332, the fifth reinforcing plate 42334, and the sixth reinforcing plate 42335, and the first reinforcing assembly 4233 of one of the two recesses 423 includes the first reinforcing plate 42331, the second reinforcing plate 42332, and the fifth reinforcing plate 42334.

[0212] In other embodiments, when the recess 423 includes at least two first reinforcing assemblies 4233, among the at least two first reinforcing assemblies 4233 of the same recess 423, part of the first reinforcing assemblies 4233 includes the first reinforcing plate 42331, the second reinforcing plate 42332, the fifth reinforcing plate 42334, and the sixth reinforcing plate 42335, and part of the first reinforcing assemblies 4233 includes the first reinforcing plate 42331, the second reinforcing plate 42332, and the fifth reinforcing plate 42334.

[0213] In the embodiment, the different structural designs of the first reinforcing assembly 4233 on the two recesses 423 can better reduce the weight and cost of the end cover assembly 400. In addition, the different structures of the first reinforcing assembly 4233 on the two recesses 423 can also play a role in preventing mistakes during assembly of the end cover assembly 400.

[0214] Please refer to Figure 21 In some embodiments, 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 assembly 4233 of one of the two recesses 423 includes the sixth reinforcing plate 42335. The plurality of protruding columns 424 further includes a second protruding column 424b arranged 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 protruding column 424b is arranged at intervals from the second reinforcing plate 42332.

[0215] It can be understood that the first reinforcing assembly 4233 of the other of the two recesses 423 does not include the sixth reinforcing plate 42335.

[0216] It can also be understood that the first reinforcing assembly 4233 of one of the two recesses 423 includes the first reinforcing plate 42331, the second reinforcing plate 42332, the fifth reinforcing plate 42334, and the sixth reinforcing plate 42335. The first reinforcing assembly 4233 of one of the two recesses 423 includes the first reinforcing plate 42331, the second reinforcing plate 42332, and the fifth reinforcing plate 42334.

[0217] Optionally, the second reinforcing plate 42332 of the first reinforcing assembly 4233 composed of the first reinforcing plate 42331, the second reinforcing plate 42332, and the fifth reinforcing plate 42334 is connected to the second protruding column 424b.

[0218] In the embodiment, through the different structural designs of the first reinforcing assembly 4233 on the two recesses 423, and the different positional relationships between the second reinforcing plate 42332 of the first reinforcing assembly 4233 of the two recesses 423 and the second protruding column 424b, a better mistake prevention effect can be achieved.

[0219] Please refer to Figure 14 and Figure 15The number of the recesses 423 is two, and the two recesses 423 are respectively located at opposite ends of the support portion 422. The first reinforcing assembly 4233 of one of the two recesses 423 comprises the sixth reinforcing plate 42335. The plurality of protruding columns 424 further comprises a second protruding column 424b arranged on the surface of the bottom plate 4231 facing the top cover 410. The sixth reinforcing plate 42335 is connected with the second reinforcing plate 42332, and the second protruding column 424b is connected with the second reinforcing plate 42332 and protrudes from the flow passage 42333.

[0220] It can be understood that the sixth reinforcing plate 42335 connects the second protruding column 424b and the second reinforcing plate 42332.

[0221] In the embodiment, the sixth reinforcing plate 42335 is arranged to better connect the second reinforcing plate 42332 and the fifth reinforcing plate 42334 together, and the whole has better strength. In addition, the sixth reinforcing plate 42335 connects the second protruding column 424b, and can better enhance the second protruding column 424b. Furthermore, the second protruding column 424b protruding from the flow passage 42333 can better disturb the airflow flowing through the flow passage 42333 and balance the air pressure in the flow passage 42333.

[0222] Optionally, one end of the sixth reinforcing plate 42335 away from the second reinforcing plate 42332 is connected with the fifth reinforcing plate 42334, and the opposite ends of the sixth reinforcing plate 42335 are respectively connected with the second reinforcing plate 42332 and the fifth reinforcing plate 42334.

[0223] It can be understood that the second protruding column 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 protruding column 424b is greater than the height of the sixth reinforcing plate 42335. It can also be understood that the second protruding column 424b protrudes from the surface of the plastic body 421 facing the top cover 410.

[0224] In the embodiment, the sixth reinforcing plate 42335 is arranged to better connect the second reinforcing plate 42332 and the fifth reinforcing plate 42334 together, and the whole has better strength. In addition, the sixth reinforcing plate 42335 connects the second protruding column 424b, and can better enhance the second protruding column 424b.

[0225] Please refer to Figure 10 , Figure 12 to Figure 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.

[0226] In this embodiment, the sixth reinforcing plate 42335 is connected to the second reinforcing plate 42332, so as to improve the structural strength of the sixth reinforcing plate 42335 and the second reinforcing plate 42332, improve the structural strength of the recess 423, and better prevent the lower plastic 420 from being deformed due to being pulled by the first insulating film 340.

[0227] Please refer to Figure 15 , Figure 18 , Figure 19 and Figure 20 In some embodiments, the plurality of convex columns 424 further includes a second convex column 424b, and the second convex column 424b is located at the intersection of the sixth reinforcing plate 42335 and the second reinforcing plate 42332.

[0228] In this embodiment, the second convex column 424b is located at the intersection of the sixth reinforcing plate 42335 and the second reinforcing plate 42332, and the sixth reinforcing plate 42335 and the second reinforcing plate 42332 can strengthen and support the second convex column 424b, so that the second convex column 424b has better structural strength, and the lower plastic 420 has better bonding strength with the top cover 410.

[0229] Please refer to 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 convex columns 424 further includes a second convex column 424b, the plastic body 421 is provided with the second convex column 424b at opposite ends along the length direction, the second convex column 424b at one end of the plastic body 421 along the length direction includes a first sub-convex column 424b1, and the second convex column 424b at the other end of the plastic body 421 along the length direction includes a second sub-convex column 424b2; the distance between the first sub-convex column 424b1 and the first side surface 4211 is different from the distance between the second sub-convex column 424b2 and the first side surface 4211; and / or, the distance between the first sub-convex column 424b1 and the second side surface 4212 is different from the distance between the second sub-convex column 424b2 and the second side surface 4212.

[0230] It can be understood that the second protruding column 424b is arranged at the opposite ends of the plastic body 421 along the length direction, and the distance between the second protruding column 424b at the opposite ends of the plastic body 421 along the length direction and the first side surface 4211 is different; and / or the distance between the second protruding column 424b at the opposite ends of the plastic body 421 along the length direction and the second side surface 4212 is different.

[0231] It can be understood that in the embodiment, the plastic body 421 includes two recessed portions 423 and a support portion 422, and the two recessed portions 423 are respectively located at the opposite ends of the support portion 422. The two recessed portions 423 are respectively provided with the second protruding column 424b, and the distance between the two second protruding columns 424b arranged on the two recessed portions 423 and the first side surface 4211 is different.

[0232] In the embodiment, by arranging the second protruding column 424b on the two recessed portions 423 to have different distances from the first side surface 4211 and / or the second side surface 4212, the foolproof function of the assembly of the lower plastic 420 and the top cover 410 can be realized without increasing new structural design, and the top cover 410 and the lower plastic 420 can be better prevented from being assembled in reverse, and the assembly efficiency of the end cover assembly 400 can be improved.

[0233] Please refer again to Figure 12 , Figure 14 , Figure 16 and Figure 18 In some embodiments, the plurality of protruding columns 424 further includes a plurality of third protruding columns 424c, and the plurality of third protruding columns 424c is arranged on the surface of the support portion 422 facing the top cover 410. Optionally, the plurality of third protruding columns 424c is arranged symmetrically along the preset central axis and symmetrically along the central axis parallel to the width direction.

[0234] In a specific example, the plurality of protruding columns 424 includes eight third protruding columns 424c.

[0235] In a specific example, the lower plastic 420 includes four first protruding columns 424a, four second protruding columns 424b and eight third protruding columns 424c. It should be noted that the attached drawings of the present application only show that the lower plastic 420 includes four first protruding columns 424a, four second protruding columns 424b and eight third protruding columns 424c. In other embodiments, the lower plastic 420 can also include other numbers of first protruding columns 424a, second protruding columns 424b and third protruding columns 424c, and the number of the attached drawings should not be understood as a limitation of the lower plastic 420 and the protruding column 424 of the present application.

[0236] In some embodiments, the plurality of protruding posts 424 are symmetrically arranged along a preset central axis. In other embodiments, the plurality of protruding posts 424 are symmetrically arranged along a central axis parallel to the width direction. In yet other embodiments, the plurality of protruding posts 424 are symmetrically arranged along a preset central axis and symmetrically arranged along a central axis parallel to the width direction.

[0237] Figure 22 FIG. 6 is an exploded structural schematic diagram of an end cover assembly 400 according to a second embodiment of the present application, from a perspective. Figure 23 FIG. 7 is an exploded structural schematic diagram of the end cover assembly 400 according to the second embodiment of the present application, from another perspective. Figure 24 FIG. 8 is an exploded structural schematic diagram of an end cover assembly 400 according to a third embodiment of the present application, from a perspective. Figure 25 FIG. 9 is an exploded structural schematic diagram of the end cover assembly 400 according to the third embodiment of the present application, from another perspective. Figure 26 FIG. 10 is an exploded structural schematic diagram of an end cover assembly 400 according to a fourth embodiment of the present application, from a perspective. Figure 27 FIG. 11 is an exploded structural schematic diagram of the end cover assembly 400 according to the fourth embodiment of the present application, from another perspective. Figure 28 FIG. 12 is a structural schematic diagram of a pole 460 according to an embodiment of the present application.

[0238] Please refer to Figure 8 , Figure 9 , Figure 22 to Figure 28 In some embodiments, the end cover assembly 400 further comprises:

[0239] a metal compression ring 440, which is arranged on a side of the top cover 410 facing away from the lower plastic 420;

[0240] an upper plastic 450, which is arranged between the metal compression ring 440 and the top cover 410, and is used to insulate the metal compression ring 440 and the top cover 410;

[0241] a pole 460, which comprises a flange portion 461 and a penetrating post 462 protruding from the flange portion 461, the flange portion 461 is located on a side of the lower plastic 420 facing away from the top cover 410, the penetrating post 462 is sequentially penetrated into the lower plastic 420, the top cover 410, the upper plastic 450, and the metal compression ring 440, and is electrically connected with the metal compression ring 440;

[0242] a sealing ring 470, which is arranged between the flange portion 461 and the lower plastic 420, and is sleeved on an outer periphery of the penetrating post 462; and

[0243] an adapter sheet 480, which is located on a side of the flange portion 461 facing away from the lower plastic 420, and is electrically connected with the flange portion 461.

[0244] Optionally, the metal compression ring 440 can be a positive metal compression ring 440a or a negative metal compression ring 440b; the pole post 460 can be a first pole post 460a or a second pole post 460b; the adapter plate 480 can be a positive adapter plate 480a or a negative adapter plate 480b, the positive adapter plate 480a being used to electrically connect the positive tab of the positive pole tab 321, and the negative adapter plate 480b being used to electrically connect the negative tab of the negative pole tab 323. When the metal compression ring 440 is the positive metal compression ring 440a, the pole post 460 is the first pole post 460a, which is a positive pole post, and the adapter plate 480 is the positive adapter plate 480a; when the metal compression ring 440 is the negative metal compression ring 440b, the pole post 460 is the second pole post 460b, which is a negative pole post, and the adapter plate 480 is the negative adapter plate 480b.

[0245] In some embodiments, the end cover assembly 400 includes a plurality of pole posts 460, the plurality of pole posts 460 including a first pole post 460a and a second pole post 460b, the first pole post 460a and the second pole post 460b being electrically connected to the electrode assembly 320 respectively, the first pole post 460a having a first identifier, and the second pole post 460b having a second identifier, the first identifier being different from the second identifier.

[0246] Optionally, the first identifier can be, but is not limited to, at least one of a color, a pattern, and the like.

[0247] Optionally, the second identifier can be, but is not limited to, at least one of a color, a pattern, and the like.

[0248] In the present embodiment, by setting the first identifier on the first pole post 460a and the second identifier on the second pole post 460b, and making the first identifier different from the second identifier, when the end cover assembly 400 is assembled, machine vision detection and recognition (referred to as CCD recognition) can be better performed, so that the first pole post 460a and the second pole post 460b can be better prevented from being assembled in reverse, a good foolproof effect can be achieved, and the assembly efficiency of the end cover assembly 400 can be improved.

[0249] In a specific example, the first pole post 460a and the second pole post 460b are different in color, so that when the end cover assembly 400 is assembled, machine vision detection and recognition (referred to as CCD recognition) can be better performed, so that the first pole post 460a and the second pole post 460b can be better prevented from being assembled in reverse, a good foolproof effect can be achieved, and the assembly efficiency of the end cover assembly 400 can be improved.

[0250] In some embodiments, the end cap assembly 400 further comprises a heat insulation sheet 490, which is arranged between the adapter sheet 480 and the lower plastic 420, so as to avoid heat generated by the adapter sheet 480 and the pole 460 from being transferred to the lower plastic 420 when the adapter sheet 480 and the pole 460 are welded, the energy storage device 300 is charging or discharging, or thermal runaway occurs, so that the lower plastic 420 is deformed, and the safety of the energy storage device 300 is improved. Alternatively, the opposite sides of each pole 460 are provided with a heat insulation sheet 490, i.e., two heat insulation sheets 490 are arranged on the opposite sides of the pole 460.

[0251] In the present application, the phrase "embodiment" or "implementation" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is not mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments. Furthermore, it should be understood that the features, structures or characteristics described in the embodiments of the present application can be combined with each other without contradiction, to form another embodiment of the present application without departing from the spirit and scope of the present application.

[0252] Finally, it should be noted that the above implementations are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application.

Claims

1. An end cap assembly, characterized by, The end cover assembly comprises: a top cover having a first surface and a second surface arranged oppositely, the top cover further having a groove located at the second surface; and a lower plastic arranged at the second surface side of the top cover, the lower plastic comprising a plastic body and a protruding column, the protruding column protruding from a side of the plastic body facing the top cover, the protruding column being accommodated in the groove and connected with the top cover; the plastic body has a length direction, a width direction and a preset central axis parallel to the length direction, the plastic body comprising a support portion and a recessed portion connected with each other, the recessed portion being arranged at one end of the support portion; the recessed portion comprises a bottom plate, a side plate and a first reinforcing assembly, the bottom plate, the side plate and the support portion are sequentially connected by bending, the bottom plate and the support portion are bent in opposite directions compared with the side plate; the first reinforcing assembly comprises a first reinforcing plate and a second reinforcing plate, the first reinforcing plate and the second reinforcing plate are arranged on the surface of the bottom plate facing the top cover and located at the side of the side plate away from the support portion, the first reinforcing plate and the second reinforcing plate are arranged in the width direction and extend in the length direction, the first reinforcing plate is closer to the preset central axis compared with the second reinforcing plate, the bottom plate, the side plate, the first reinforcing plate and the second reinforcing plate form a flow-through channel, the flow-through channel penetrates the side plate to make the flow-through channel communicate with the side of the support portion away from the top cover.

2. The end cap assembly of claim 1, wherein, The recessed portion comprises two first reinforcing assemblies, the two first reinforcing assemblies are arranged in the width direction of the plastic body, the flow-through channel comprises a first flow-through channel and a second flow-through channel, one of the two first reinforcing assemblies has the first flow-through channel, the other of the two first reinforcing assemblies has the second flow-through channel, the first flow-through channel has a first central axis, the second flow-through channel has a second central axis, the first central axis and the second central axis are parallel to the length direction; the number of the protruding columns is plural, part of the plural protruding columns are located on both sides of the first central axis, part of the plural protruding columns are located on both sides of the second central axis.

3. The end cap assembly of claim 1, wherein, the number of the protruding columns is plural, the number of the grooves is plural, the protruding columns and the grooves are arranged correspondingly, the plural protruding columns comprise a first protruding column, the first protruding column is arranged on the surface of the bottom plate facing the top cover, the first protruding column is connected with the first reinforcing plate and protrudes toward the flow-through channel compared with the first reinforcing plate.

4. The end cap assembly of claim 3, wherein, The first reinforcing plate and the first protruding column are located on the same side of the preset central axis.

5. The end cap assembly of claim 3, wherein, The first protruding column has a flow guide surface facing the flow-through channel.

6. The end cap assembly of claim 1, wherein, The plastic body comprises a first reinforcing assembly, in the thickness direction of the top cover, the protruding column protrudes from the first reinforcing assembly in the direction of the top cover.

7. The end cap assembly of claim 1, wherein, The number of the convex columns is multiple, the multiple convex columns are arranged at intervals, and a part of the multiple convex columns are located on the same straight line, which is parallel to the width direction of the plastic body.

8. The end cap assembly of claim 1, wherein, The recess further comprises a second reinforcing assembly arranged on the same side of the bottom plate as the first reinforcing assembly, the second reinforcing assembly comprises a third reinforcing plate, the third reinforcing plate is located on the side of the side plate away from the support part, and is arranged at intervals along the length direction of the side plate, and the third reinforcing plate is connected to the first reinforcing plate.

9. The end cap assembly of claim 8, wherein, The second reinforcing assembly further comprises a fourth reinforcing plate, and opposite ends of the fourth reinforcing plate are connected to the third reinforcing plate and the side plate respectively.

10. The end cap assembly of claim 9, wherein, Part of the third reinforcing plate protrudes towards the flow passage.

11. The end cap assembly of claim 1, wherein, The number of the convex columns is multiple, the number of the grooves is multiple, the convex columns and the grooves are arranged correspondingly, and the multiple convex columns further comprise a second convex column arranged on the surface of the bottom plate facing the top cover.

12. The end cap assembly of claim 11, wherein, The second convex column is located on the side of the second reinforcing plate away from the first reinforcing plate.

13. The end cap assembly of claim 11, wherein, The second convex column is connected to the second reinforcing plate, and the second convex column protrudes towards the flow passage compared with the second reinforcing plate.

14. The end cap assembly of claim 1, wherein, The first reinforcing assembly further comprises a fifth reinforcing plate, the fifth reinforcing plate is arranged on 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 opposite ends of the fifth reinforcing plate are connected to the second reinforcing plate and the side plate respectively.

15. The end cap assembly of claim 1, wherein, The first reinforcing assembly further comprises a fifth reinforcing plate and a sixth reinforcing plate, the fifth reinforcing plate is arranged on 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 opposite ends of the fifth reinforcing plate are connected to the second reinforcing plate and the side plate respectively; the sixth reinforcing plate is arranged on 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, and the sixth reinforcing plate is connected to the fifth reinforcing plate.

16. The end cap assembly of claim 15, wherein, The number of the recesses is two, the two recesses are respectively located on opposite ends of the support part, and the first reinforcing assembly of one of the two recesses comprises the sixth reinforcing plate.

17. The end cap assembly of claim 16, wherein, The number of the convex columns is multiple, the number of the grooves is multiple, the convex columns and the grooves are arranged correspondingly, and the multiple convex columns further comprise a second convex column arranged 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 convex column is arranged at intervals with the second reinforcing plate.

18. The end cap assembly of claim 16, wherein, The number of the convex columns is multiple, the number of the grooves is multiple, the convex columns and the grooves are arranged correspondingly, and the multiple convex columns further comprise a second convex column arranged on the surface of the bottom plate facing the top cover; The sixth reinforcing plate is connected to the second reinforcing plate, the second convex column is connected to the second reinforcing plate and protrudes from the flow passage.

19. The end cap assembly of claim 15, wherein, The sixth reinforcing plate is connected to the second reinforcing plate, and there is an intersection point between the sixth reinforcing plate and the second reinforcing plate.

20. The end cap assembly of claim 19, wherein, The plurality of protruding columns further comprises a second protruding column located at the intersection of the second reinforcing plate and the sixth reinforcing plate.

21. The end cap assembly of claim 2, wherein, The protruding column protrudes towards the top cover in the thickness direction of the top cover.

22. The end cap assembly of claim 21, wherein, 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. The number of protruding columns is plural, and the number of recesses is plural. The protruding columns and the recesses are correspondingly arranged. The plurality of protruding columns further comprises a second protruding column. The second protruding column is arranged at the opposite ends of the plastic body along the length direction. The second protruding column at one end of the plastic body along the length direction comprises a first sub-protruding column, and the second protruding column at the other end of the plastic body along the length direction comprises a second sub-protruding column. The distance between the first sub-protruding column and the first side is different from the distance between the second sub-protruding column and the first side. And / or, the distance between the first sub-protruding column and the second side is different from the distance between the second sub-protruding column and the second side.

23. The end cap assembly of claim 1, wherein, 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. The number of protruding columns is plural, and the number of recesses is plural. The protruding columns and the recesses are correspondingly arranged. The plurality of protruding columns further comprises a second protruding column. The second protruding column is arranged at the opposite ends of the plastic body along the length direction. The second protruding column at one end of the plastic body along the length direction comprises a first sub-protruding column, and the second protruding column at the other end of the plastic body along the length direction comprises a second sub-protruding column. The distance between the first sub-protruding column and the first side is different from the distance between the second sub-protruding column and the first side. And / or, the distance between the first sub-protruding column and the second side is different from the distance between the second sub-protruding column and the second side.

24. An energy storage device, comprising: Comprising: a housing; the end cover assembly of any one of claims 1-23, the end cover assembly and the housing enclosing a receiving cavity; and an electrode assembly, the electrode assembly being disposed in the receiving cavity and electrically connected with the end cover assembly.

25. The energy storage device of claim 24, wherein, The end cover assembly further comprises a plurality of pole columns, the plurality of pole columns comprising a first pole column and a second pole column, the first pole column and the second pole column being electrically connected with the electrode assembly respectively. The first pole column has a first identifier, and the second pole column has a second identifier. The first identifier is different from the second identifier.

26. An electrical device, characterized by The electric device comprises: a device body, and the energy storage device of claim 24 or 25, the energy storage device being used to supply power for the device body.

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