CN120854792A

CN120854792A - End cover assembly, energy storage device and electrical equipment

Info

Publication number: CN120854792A
Application number: CN202511358123.7A
Authority: CN
Inventors: 周文扬; 肖和攀
Original assignee: Shenzhen Haichen Energy Storage Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Shenzhen Haichen Energy Storage Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2025-09-23
Filing date: 2025-09-23
Publication date: 2025-10-28
Anticipated expiration: 2045-09-23
Also published as: CN121922786A; CN120854792B

Abstract

The present application provides an end cap assembly, an energy storage device, and an electrical device. The end cap assembly comprises: a top cap having a first surface and a second surface disposed opposite each other, the top cap further comprising a groove located on the second surface; and a lower plastic member disposed on the second surface side of the top cap, the lower plastic member comprising a plastic body and a protrusion, the protrusion protruding from the side of the plastic body facing the top cap, the protrusion accommodated in the groove and connected to the top cap.

Description

End cover assembly, energy storage device and electric equipment

Technical Field

The application relates to the field of energy storage, in particular to an end cover assembly, an energy storage device and electric equipment.

Background

In order to avoid a short circuit between a cell (or a bare cell or an electrode assembly) and a metal casing in a battery, an insulating film (i.e., a Mylar film) is generally disposed between the cell and the metal casing. In order to make the end cap assembly and the battery cell have better integrity, the assembly is easier and the structural strength is improved, and the insulating film is usually adhered to the lower plastic of the end cap assembly. In the processes of battery assembly, transportation, use and the like, the insulating film pulls down the plastic along the gravity direction, so that the lower plastic deforms, and safety problems of some rows are caused.

Disclosure of Invention

Embodiments of the first aspect of the present application provide an end cap assembly comprising:

a top cover having a first surface and a second surface disposed opposite to each other, a groove on the second surface, and

The lower plastic is arranged on the second surface side of the top cover and comprises a plastic body and a convex column, the convex column is convexly arranged on one side of the plastic body, facing the top cover, of the plastic body, and the convex column is accommodated in the groove and is connected with the top cover.

The plastic body is provided with a preset central axis in the length direction, the width direction and parallel to the length direction, and comprises a supporting part and a concave part which are connected, wherein the concave part is arranged at one end of the supporting part; the concave part comprises a bottom plate, a side plate and a first reinforcing component, the bottom plate, the side plate and the supporting part are sequentially bent and connected, and the bottom plate and the supporting part are respectively bent towards opposite directions compared with the side plate;

The first reinforcing component 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 are positioned on one side of the side plate, which is away from the supporting part, the first reinforcing plate and the second reinforcing plate are arranged at intervals along the width direction, the first reinforcing plate and the second reinforcing plate are all extended along the length direction, the first reinforcing plate is farther close to the preset central axis than the second reinforcing plate, a circulating channel is formed by encircling the bottom plate, the side plate, the first reinforcing plate and the second reinforcing plate, and the circulating channel penetrates through the side plate so that the circulating channel is communicated with one side of the supporting part, which is away from the top cover.

The concave part comprises two first reinforcing components, the two first reinforcing components are arranged at intervals along the width direction of the plastic body, the circulation channel comprises a first circulation channel and a second circulation channel, one of the two first reinforcing components is provided with the first circulation channel, the other of the two first reinforcing components is provided with the second circulation channel, the first circulation channel is provided with a first central axis, the second circulation channel is provided with a second central axis, and the first central axis and the second central axis are parallel to the length direction;

The number of the convex columns is multiple, a part of the convex columns is positioned on two sides of the first central axis, and a part of the convex columns is positioned on two sides of the second central axis.

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 convex columns comprise first convex columns, the first convex columns are arranged on the surface of the bottom plate facing the top cover, the first convex columns are connected with the first reinforcing plate and protrude towards the circulation channel compared with the first reinforcing plate.

The first reinforcing plate and the first convex column are positioned on the same side of the preset central axis.

The first convex column is provided with a flow guiding surface, and the flow guiding surface faces the circulation channel.

The plastic body comprises a first reinforcing component, and the protruding columns protrude out of the first reinforcing component towards the top cover along the thickness direction of the top cover.

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

The concave part 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 one side, away from the supporting part, of the side plate, the third reinforcing plate is arranged at intervals along the length direction and the side plate, and the third reinforcing plate is connected with the first reinforcing plate.

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

Wherein a portion of the third reinforcing plate protrudes toward the flow passage.

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 convex columns further comprise second convex columns, and the second convex columns are arranged on the surface of the bottom plate facing the top cover.

Wherein, the second projection is located the second reinforcing plate deviates from the one side of first reinforcing plate.

The second protruding columns are connected with the second reinforcing plate and protrude towards the circulation channels compared with the second reinforcing plate.

The first reinforcing component further comprises a fifth reinforcing plate, the fifth reinforcing plate is convexly arranged on the surface of the bottom plate, facing the top cover, of the bottom plate, the fifth reinforcing plate is located on one side, deviating from the first reinforcing plate, of the second reinforcing plate, and the opposite ends of the fifth reinforcing plate are respectively connected with the second reinforcing plate and the side plate.

The first reinforcing component further comprises 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 one side, away from the first reinforcing plate, of the second reinforcing plate, the second reinforcing plate and the side plate are respectively connected with the opposite ends of the fifth reinforcing plate, the sixth reinforcing plate is convexly arranged on the surface, facing the top cover, of the bottom plate, the sixth reinforcing plate is located on one side, facing away from the first reinforcing plate, of the second reinforcing plate, and the sixth reinforcing plate is connected with the fifth reinforcing plate.

The number of the concave parts is two, the two concave parts are respectively positioned at two opposite ends of the supporting part, and the first reinforcing component of one of the two concave parts comprises the sixth reinforcing plate.

The number of the convex columns is multiple, the number of the grooves is multiple, the convex columns are arranged corresponding to the grooves, the convex columns further comprise second convex columns, and the second convex columns are arranged on the surface of the bottom plate facing the top cover;

The sixth reinforcing plate is connected with the second reinforcing plate, and the second convex columns are arranged at intervals with the second reinforcing plate.

The sixth reinforcing plate is connected with the second reinforcing plate, and the second convex columns are connected with the second reinforcing plate and protrude out of the circulation channels.

Wherein the sixth reinforcing plate is connected with the second reinforcing plate, and an intersection point exists between the sixth reinforcing plate and the second reinforcing plate.

Wherein the plurality of bosses further comprise a second boss located at an intersection of the second reinforcing plate and the sixth reinforcing plate.

And the convex columns protrude out of the first reinforcing component towards the direction of the top cover along the thickness direction of the top cover.

The plastic body is provided with a length direction, a width direction, a first side surface extending along the length direction and a second side surface extending along the width direction, 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 convex columns further comprise second convex columns, the second convex columns are arranged at two opposite ends of the plastic body along the length direction, the second convex columns at one end of the plastic body along the length direction comprise first sub-convex columns, the second convex columns at the other end of the plastic body along the length direction comprise second sub-convex columns, the distance between the first sub-convex columns and the first side surface is different from the distance between the second sub-convex columns and the first side surface, and/or the distance between the first sub-convex columns and the second side surface is different from the distance between the second sub-convex columns and the second side surface.

The second aspect of the present application also provides an energy storage device, including:

a housing;

The end cover assembly of the first aspect of the application encloses a housing cavity with the housing, and

And the electrode assembly is arranged in the accommodating cavity and is electrically connected with the end cover assembly.

The end cover assembly further comprises a plurality of polar posts, the polar posts comprise first polar posts and second polar posts, the first polar posts and the second polar posts are respectively and electrically connected with the electrode assembly, the first polar posts are provided with first marks, the second polar posts are provided with second marks, and the first marks are different from the second marks.

The third aspect of the present application also provides an electric device, wherein the electric device includes:

an apparatus body, and

The energy storage device according to the second aspect of the present application.

The end cover assembly comprises a top cover and lower plastic, wherein the top cover is provided with a first surface and a second surface which are oppositely arranged, the top cover is further provided with a groove, the groove is positioned on the second surface, the 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 convexly arranged on one side of the plastic body, facing the top cover, and the convex column is accommodated in the groove and is connected with the top cover. Through the cooperation of projection and recess, can be better fixed with lower plastic and top cap for have better wholeness down between plastic and the top cap, the intensity of plastic down that improves that can be better, in battery cell equipment, transportation and use etc. in-process, plastic down that avoids that can be better takes place to warp (for example because of being pulled by first insulating film repeatedly and take place to warp), break away from the top cap, thereby can avoid inserting in the electrode assembly after plastic down warp, make direct contact between positive pole piece and the negative pole piece, and then take place the condition of short circuit etc. can be better avoid the production of potential safety hazard, thereby the security that improvement battery cell that can be better used.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an energy storage system according to an embodiment of the application.

Fig. 2 is a schematic structural diagram of an electric device according to an embodiment of the application.

Fig. 3 is a schematic structural diagram of an energy storage device according to an embodiment of the application.

Fig. 4 is a schematic structural diagram of an energy storage device according to another embodiment of the present application.

Fig. 5 is an exploded view of the energy storage device according to the embodiment of fig. 4.

Fig. 6 is a schematic structural view of an electrode assembly according to an embodiment of the present application.

FIG. 7 is a schematic structural view of an end cap assembly according to an embodiment of the present application.

Fig. 8 is a schematic view of an exploded view of a first embodiment of an end cap assembly according to the present application.

Fig. 9 is a schematic exploded view of an end cap assembly from another perspective according to a first embodiment of the present application.

FIG. 10 is a schematic view of a lower plastic structure according to a first embodiment of the present application.

FIG. 11 is a schematic view of another view of the lower plastic according to the first embodiment of the present application.

FIG. 12 is a plan view of the lower plastic of the embodiment of FIG. 10 according to the present application.

Fig. 13 is a partial enlarged view of fig. 10.

Fig. 14 is a schematic structural diagram of a lower plastic according to a second embodiment of the present application.

FIG. 15 is a plan view of the lower plastic of the embodiment of FIG. 14 according to the present application.

Fig. 16 is a schematic structural view of a lower plastic according to a third embodiment of the present application.

FIG. 17 is a plan view of the lower plastic of the embodiment of FIG. 16 according to the present application.

Fig. 18 is a schematic structural diagram of a lower plastic according to a fourth embodiment of the present application.

FIG. 19 is a plan view of the lower plastic of the embodiment of FIG. 18 according to the present application.

Fig. 20 is a schematic structural diagram of a lower plastic according to a fifth embodiment of the present application.

FIG. 21 is a schematic view of a lower plastic structure according to a sixth embodiment of the present application.

FIG. 22 is a schematic exploded view of a second embodiment of an end cap assembly according to the present application.

Fig. 23 is an exploded view of an alternative view of an end cap assembly according to a second embodiment of the present application.

FIG. 24 is a schematic exploded view of a third embodiment of an end cap assembly according to the present application.

Fig. 25 is an exploded view of an alternative view of an end cap assembly according to a third embodiment of the present application.

Fig. 26 is a schematic view of an exploded view of a fourth embodiment of an end cap assembly according to the present application.

Fig. 27 is a schematic view of an exploded view of an end cap assembly according to a fourth embodiment of the present application.

Fig. 28 is a schematic structural view of a pole according to an embodiment of the application.

Reference numerals illustrate:

100-energy storage system, 110-high-voltage cable, 120-first electric energy conversion device, 130-second electric energy conversion device, 200-electric equipment, 210-equipment body, 300-energy storage device, 310-shell, 320-electrode assembly, 321-positive pole piece, 322-diaphragm, 323-negative pole piece, 330-accommodating 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-lower plastic, 421-plastic body, 4211-first side, 4212-second side, 422-supporting part, 4221-through hole, 423-concave part, 4231-bottom plate, 4232-side plate, 42321-through hole, 4233-first reinforcing component, 42331-first reinforcing plate, 42332-second reinforcing plate, 42333-flow channel, 42333 a-first flow channel, 42333 b-second flow channel, 42334-fifth reinforcing plate, 42334 a-arc segment, 42334 b-straight segment, 42335-sixth reinforcing plate, 4234-second reinforcing component, 42341-third reinforcing plate, 42342-fourth reinforcing plate, 424-stud, 424 a-first stud, 4241 a-flow guiding surface, 424 b-second stud, 424b 1-first sub-stud, 424b 2-second sub-stud, 424 c-third stud, 430-explosion-proof component, 431-explosion-proof valve, 432-protective sheet, 440-metal pressure ring, 440 a-positive metal pressure ring, 440 b-negative metal pressure ring, 450-upper plastic, 460-pole, 461-flange part, 462-penetrating pole, 460 a-first pole, 460 b-second pole, 470-sealing ring, 480-rotating sheet, 480 a-positive electrode rotating sheet, 480 b-negative electrode rotating sheet and 490-heat insulation sheet.

Detailed Description

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

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

It should be noted that, for convenience of explanation, like reference numerals denote like components in the embodiments of the present application, and detailed descriptions of the like components are omitted in the different embodiments for brevity.

Because of the strong timeliness and space properties of energy required by people, in order to reasonably utilize the energy and improve the utilization rate of the energy, one energy form needs to be stored by one medium or equipment and then converted into another energy form, and the energy is released in a specific energy form based on future application. At present, the main way of generating green electric energy is to develop green energy sources such as photovoltaic, wind power and the like to replace fossil energy sources.

At present, the generation of green electric energy generally depends on photovoltaic, wind power, water potential and the like, but wind energy, solar energy and the like generally have the problems of strong intermittence and large fluctuation, which can cause unstable power grid, insufficient peak electricity consumption, too much electricity consumption and unstable voltage can cause damage to the electric power, so that the problem of 'wind abandoning and light abandoning' possibly occurs due to insufficient electricity consumption requirement or insufficient power grid acceptance, and the problem needs to be solved by relying on energy storage. The energy is converted into other forms of energy through physical or chemical means and is stored, the energy is converted into electric energy when needed and released, in short, the energy storage is similar to a large-scale 'charge pal', the electric energy is stored when the photovoltaic and wind energy are sufficient, and the stored electric power is released when needed.

Taking electrochemical energy storage as an example, the scheme provides an energy storage device which is applied to an energy storage system, wherein a group of chemical batteries are arranged in the energy storage device, chemical elements in the batteries are mainly used as energy storage media, and the charge and discharge process is accompanied with chemical reaction or change of the energy storage media.

The present energy storage (i.e. energy storage) application scenario is comparatively extensive, including aspects such as power generation side energy storage, electric wire netting side energy storage and power consumption side energy storage, and the kind of corresponding energy storage device includes:

(1) The energy storage power station is used as a high-quality active/reactive power regulating power supply in a power supply side, so that the load matching of electric energy in time and space is realized, the capacity of absorbing renewable energy sources is enhanced, the instantaneous power change is reduced, the impact on a power grid is reduced, the problem of new energy power generation and absorption is improved, and the energy storage power station has great significance in the aspects of standby of a power grid system, relieving peak load power supply pressure and peak regulation and frequency modulation;

(2) The energy storage container applied to the power grid side has the functions of mainly peak regulation, frequency modulation and power grid blocking and peak regulation relieving, and can realize peak clipping and valley filling of the power consumption load, namely the energy storage battery is charged when the power consumption load is low, and the stored electric quantity is released in the peak period of the power consumption load, so that the balance between power production and power consumption is realized;

(3) The small energy storage cabinet applied to the electricity utilization side has the main functions of spontaneous electricity utilization, peak Gu Jiacha arbitrage, capacity cost management and power supply reliability improvement. According to the different application scenes, the electricity-side energy storage can be divided into an industrial and commercial energy storage cabinet, a household energy storage device, an energy storage charging pile and the like, and is generally matched with the distributed photovoltaic. The energy storage can be used by industrial and commercial users for valley peak price difference arbitrage and capacity cost management. In the electric power market implementing peak-valley electricity price, the energy storage system is charged when the electricity price is low, and the energy storage system is discharged when the electricity price is high, so that peak-valley electricity price difference arbitrage is realized, and the electricity cost is reduced. In addition, the energy storage system is suitable for two industrial enterprises with electricity price, can store energy when electricity is used in low valley and discharge the energy when the electricity is used in peak load, so that peak power and the declared maximum demand are reduced, and the purpose of reducing the capacity electricity fee is achieved. The household photovoltaic distribution and storage can improve the spontaneous self-use level of the electric power. Due to high electricity prices and poor power supply stability, the photovoltaic installation requirements of users are pulled. Considering that the photovoltaic power generation is performed in daytime, and the load of a user is generally higher at night, the photovoltaic power can be better utilized through configuration of energy storage, the spontaneous self-use level is improved, and meanwhile the power consumption cost is reduced. In addition, the fields of communication base stations, data centers and the like need to be configured with energy storage for standby power.

In some embodiments, please refer to fig. 1, fig. 1 is a schematic diagram of an energy storage system 100 according to an embodiment of the present application, and the embodiment of fig. 1 of the present application is illustrated by taking a power generation/distribution side shared energy storage scenario as an example, and the energy storage device 300 of the present application is not limited to the power generation/distribution side energy storage scenario.

The application provides an energy storage system 100, which comprises a high-voltage cable 110, a first electric energy conversion device 120, a second electric energy conversion device 130 and an energy storage device 300 provided by the application, wherein in some embodiments of a power generation side scene, the second electric energy conversion device 130 can be a wind power electric energy conversion device, because fluctuation, randomness and intermittence of electric energy generated by wind power electric energy conversion exist, unstable electric energy output by the wind power electric energy conversion device can be stored to the energy storage device 300 firstly through grid connection, the energy storage device 300 is connected with the high-voltage cable 110 and outputs smooth electric energy to be supplied to a power distribution network for use, peak regulation and frequency modulation are realized, the power grid is stably operated, or the wind power electric energy conversion device is always connected with the high-voltage cable 110, the electric energy output by the wind power electric energy conversion device is supplied to the power distribution network for use under the ordinary power generation condition, and the current electric load is lower, the multiple generated electric energy is stored to the energy storage device 300 firstly when the wind power conversion device generates surplus, the wind power is reduced, the problem of discarding and the light source is solved, the energy storage device 300 can be stored to the peak regulation and frequency modulation is realized, the peak regulation and frequency modulation is realized, the power grid is supplied to the power grid for the power grid, the peak regulation and the power grid is fully operated, the peak regulation and the power grid is fully charged by the power grid, and the peak regulation and the power grid has the power grid power conversion mode.

In some embodiments on the distribution network side, the first power conversion device 120 may be a photovoltaic power conversion device, where the energy storage device 300 is connected to the high voltage cable 110 and installed between the downstream of the high voltage cable 110 and the user load, and the power output by the photovoltaic power conversion device is stored in the energy storage device 300, and responds to serve as a standby power source in time when the power grid/distribution network fails, or provides power supply support to delay the economic pressure generated by the power grid/distribution expansion when the power grid of the high voltage cable 110 is blocked to relieve the line blockage and the power grid planning expansion occurs.

Alternatively, the first electric energy conversion device 120 may include, but is not limited to, a wind power electric energy conversion device, the second electric energy conversion device 130 may include, but is not limited to, a photovoltaic electric energy conversion device, and the first electric energy conversion device 120 and the second electric energy conversion device 130 may convert at least one of solar energy, light energy, wind energy, heat energy, tidal energy, biomass energy, mechanical energy, and the like into electric energy.

Alternatively, the energy storage device 300 may include, but is not limited to, energy storage applications for energy storage power stations, hydro/thermal/wind power generation systems, solar power generation systems, mobile power systems, smart home systems, or temporary power supply systems, and may be used in a variety of fields such as data centers, military equipment, aerospace, charging piles, electric vehicles, and the like.

Referring to fig. 2, an embodiment of the present application further provides an electrical device 200, where the electrical device 200 includes an equipment body 210 and an energy storage device 300, and the energy storage device 300 is used for supplying power to the equipment body 210.

Alternatively, the powered device 200 may be, but is not limited to being, at least one of a power grid, a base station, and the like.

Alternatively, electrical connection between powered device 200 and the energy storage device may be made through high voltage cable 110.

Alternatively, the energy storage device 300 may include a battery module composed of single batteries, a battery pack, a battery cluster, a mobile power source, an energy storage cabinet/energy storage pre-compartment, and other battery integrated systems. The practical application form of the energy storage device 300 provided in the embodiment of the present application may be, but is not limited to, the listed products, and may be other application forms, and the embodiment of the present application does not strictly limit the application form of the energy storage device 300.

Alternatively, the unit cell may be, but is not limited to, at least one of a cylindrical cell, a prismatic cell, or other shaped cell.

Alternatively, the unit cell may be a secondary battery, and the secondary battery refers to a unit cell that can be continuously used by activating the active material in a charging manner after the unit cell is discharged. The single battery may be a lithium 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 storage battery, etc., which is not particularly limited in the present application.

Referring to fig. 3, fig. 3 is a schematic structural diagram of an energy storage device 300 according to an embodiment of the application.

In some embodiments, when the energy storage device 300 is a battery integrated system such as a battery pack, a battery cluster, a mobile power source, an energy storage cabinet/energy storage pre-compartment, etc., the energy storage device 300 may include, but is not limited to, including one or more single batteries, and when the energy storage device 300 includes a plurality of single batteries, the plurality of single batteries may be connected in series, parallel, or a series-parallel connection.

The term "plurality" refers to greater than or equal to two, and may be, for example, but not limited to, 2, 5, 10, 30, 50, 100, 200, 300, 400, 800, 1000, etc. The number of cells included in the energy storage device 300 may be determined based on the rated capacity of the cells and the rated capacity to be achieved by the energy storage device 300.

In order to avoid a short circuit between a cell (or a bare cell or an electrode assembly) and a metal case in a battery, an insulating film (Mylar film) is generally disposed between the cell and the metal case. In order to make the end cap assembly and the battery cell have better integrity, the assembly is easier and the structural strength is improved, and the insulating film is usually adhered to the lower plastic of the end cap assembly. In the processes of battery assembly, transportation, use and the like, the insulating film pulls down the plastic along the gravity direction, so that the lower plastic deforms, and safety problems of some rows are caused.

Fig. 4 is a schematic structural diagram of an energy storage device 300 according to another embodiment of the application. Fig. 5 is an exploded view of the energy storage device 300 according to the embodiment of fig. 4. In the following description of the embodiments of the present application, the energy storage device 300 is illustrated and described by taking a single battery as an example, and should not be construed as limiting the energy storage device 300 of the present application.

Referring to fig. 4 and 5, an embodiment of the present application further provides an energy storage device 300, which includes a housing 310, an end cap assembly 400, an electrode assembly 320 and an electrolyte, wherein the end cap assembly 400 and the housing 310 enclose a receiving cavity 330, the electrode assembly 320 is disposed in the receiving cavity 330, the electrode assembly 320 is electrically connected with the end cap assembly 400, and the electrolyte is disposed in the receiving cavity 330.

At least a portion of the electrode assembly 320 is impregnated with an electrolyte.

Fig. 6 is a schematic structural view of an electrode assembly 320 according to an embodiment of the present application. Referring to fig. 6, the electrode assembly 320 may optionally include a positive electrode tab 321, a separator 322, and a negative electrode tab 323. The positive electrode piece 321 and the negative electrode piece 323 are respectively positioned at two opposite sides of the diaphragm 322. I.e., the separator 322 is positioned between the positive electrode tab 321 and the negative electrode tab 323, separating the positive electrode tab 321 from the negative electrode tab 323. The positive electrode tab 321, the separator 322, and the negative electrode tab 323 are all at least partially immersed in the electrolyte.

Optionally, the energy storage device 300 further includes a first insulating film 340 (Mylar film), the first insulating film 340 is disposed between the case 310 and the electrode assembly 320 for insulating the case 310 from the electrode assembly 320, and the first insulating film 340 is connected to the end cap assembly 400.

In addition, the first insulating film 340 has an electrolyte solution between the first insulating film 340 and the case 310.

Optionally, the energy storage device 300 further includes a second insulating film 350 (also referred to as an insulating blue film), and the second insulating film 350 is disposed on the outer circumference of the housing 310, for insulating the outer surface of the housing 310.

Fig. 7 is a schematic diagram of an end cap assembly 400 according to an embodiment of the application. Fig. 8 is a schematic exploded view of an end cap assembly 400 according to an embodiment of the present application. Fig. 9 is an exploded view of an end cap assembly 400 from another perspective in accordance with one embodiment of the present application.

Referring to fig. 7 to 9, the embodiment of the application further provides an end cap assembly 400, wherein the end cap assembly 400 includes a top cap 410 and a lower plastic 420, the top cap 410 has a first surface 411 and a second surface 412 disposed opposite to each other, the top cap 410 further has a groove 413, the groove 413 is located on the second surface 412, the lower plastic 420 is disposed on the second surface 412 side of the top cap 410, the lower plastic 420 includes a plastic body 421 and a protruding pillar 424, the protruding pillar 424 is protruding on a side of the plastic body 421 facing the top cap 410, and the protruding pillar 424 is accommodated in the groove 413 and connected to the top cap 410.

It will be appreciated that the first surface 411 is disposed away from the lower plastic 420 and the second surface 412 is disposed facing the lower plastic 420.

Optionally, the groove 413 extends through the second surface 412, not through the first surface 411, in other words, the groove 413 is a blind groove.

Alternatively, the number of the grooves 413 may be one or more, and when the number of the grooves 413 is plural, the plurality of grooves 413 are disposed at intervals on the second surface 412. Specifically, the number of the grooves 413 may 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 "plurality" means greater than or equal to two.

Alternatively, the number of the protruding columns 424 may be one or more, and when the number of the protruding columns 424 is plural, the plurality of protruding columns 424 are disposed at intervals on the side of the plastic body facing the top cover. Specifically, the number of the posts 424 may be, but is not limited to, 2, 3,4, 5,6,7, 8,9, 10, 11, 12, 13, 14, 15, 16, etc.

Optionally, the number of the protruding columns 424 is equal to the number of the grooves 413, and the protruding columns 424 are in one-to-one correspondence with the grooves 413.

It should be noted that the protruding columns 424 are in one-to-one correspondence with the grooves 413, and it is understood that one protruding column 424 is disposed in one groove 413, and different protrusions are disposed in different grooves 413.

Optionally, the plastic body 421 and the boss 424 are integrally formed, in other words, the plastic body 421 and the boss 424 are different parts of the same component. The plastic body 421 and the boss 424 can be manufactured by injection molding in one process.

In some embodiments, the lower plastic 420 is a piece, and the lower plastic 420 is prepared by integral injection molding.

It is understood that the top cover 410 and the lower plastic 420 are stacked along the thickness direction of the plastic body 421.

Optionally, the lower plastic 420 is connected to the top cover 410 by posts 424. In some embodiments, the posts 424 and the grooves 413 are interference fit to connect the top cover 410 to the lower plastic 420. In other embodiments, an adhesive is provided between the posts 424 and the grooves 413 to attach the top cover 410 to the lower plastic 420. In still other embodiments, the posts 424 of the lower plastic 420 are bonded to the top cover 410 by heat staking the posts 424 to the top cover 410.

Optionally, the lower plastic 420 is connected to the first insulating film 340. Alternatively, the first insulating films 340 are bonded to opposite ends of the lower plastic 420 along the length direction of the plastic body 421 by heat fusion.

The end cap assembly 400 of the present application comprises a top cap 410 and a lower plastic 420, wherein the top cap 410 is provided with a first surface 411 and a second surface 412 which are arranged opposite to each other, the top cap 410 is further provided with a groove 413, the groove 413 is positioned on the second surface 412, the lower plastic 420 is arranged on the second surface 412 side of the top cap 410, the lower plastic 420 comprises a plastic body 421 and a protruding column 424, the protruding column 424 is protruding on one side of the plastic body 421 facing the top cap 410, and the protruding column 424 is accommodated in the groove 413 and is connected with the top cap 410. Through the cooperation of projection 424 and recess 413, can be better fixed lower plastic 420 and top cap 410 for have better wholeness between lower plastic 420 and the top cap 410, the intensity of plastic 420 under the improvement that can be better, in energy memory 300 equipment, transportation and use etc. in-process, plastic 420 takes place to warp (for example because of being pulled repeatedly by first insulating film 340 and take place to warp), break away from top cap 410 down in can avoid plastic 420 to insert in electrode assembly 320 after warp, make direct contact between positive pole piece 321 and the negative pole piece 323, and then take place the condition of short circuit etc. can be better avoid the production of potential safety hazard, thereby the security that energy memory 300 used can be better improves.

Fig. 10 is a schematic view of a lower plastic 420 according to an embodiment of the application. FIG. 11 is a schematic view of another view of the lower plastic 420 according to an embodiment of the application. Fig. 12 is a plan view of the lower plastic 420 of the embodiment of fig. 10 according to the present application. Fig. 13 is a partial enlarged view of fig. 10.

Referring to fig. 10 to 13, in some embodiments, the plastic body 421 has a length direction (as shown by a double arrow X in fig. 10), a width direction (as shown by a double arrow Y in fig. 10) and a preset central axis (as shown by a dotted line O-O in fig. 12) parallel to the length direction, the plastic body 421 includes a supporting portion 422 and a recess portion 423 connected to each other, the recess portion 423 is disposed at one end of the supporting portion 422, the recess portion 423 includes a bottom plate 4231, a side plate 4232 and a first reinforcing component 4233, the bottom plate 4231, the side plate 4232 and the supporting portion 422 are sequentially bent and connected, and the bottom plate 4231 and the supporting portion 422 are respectively bent in opposite directions compared with the side plate 4232;

The first reinforcing member 4233 comprises a first reinforcing plate 42331 and a second reinforcing plate 42332, the first reinforcing plate 42331 and the second reinforcing plate 42332 are disposed on the surface of the bottom plate 4231 facing the top cover 410 and on the side of the side plate 4232 facing away from the supporting portion 422, the first reinforcing plate 42331 and the second reinforcing plate 42332 are disposed at intervals along the width direction of the lower plastic 420, the first reinforcing plate 42331 and the second reinforcing plate 42332 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, a flow channel 42333 is defined between the bottom plate 4231, the side plate 4232, the first reinforcing plate 42331 and the second reinforcing plate 42332, and the flow channel 42333 penetrates through the side plate 4232 so that the flow channel 42333 is communicated with the side of the supporting portion 422 facing away from the top cover 410.

The dimension of the plastic body 421 in the longitudinal direction is larger than the dimension of the plastic body 421 in the width direction. The width dimension of the plastic body 421 is larger than the thickness dimension of the plastic body 421 (as indicated by the double arrow Z in fig. 10).

It should be noted that the flow channel 42333 penetrates the side plate 4232, and it is understood that the side plate 4232 has a through hole 42321 (as shown in fig. 11), and the through hole 42321 communicates with the flow channel 42333 and a side of the support portion 422 facing away from the top cover 410.

It can be appreciated 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 integrally formed.

When the thermal runaway or the electrochemical reaction occurs in the energy storage device 300, the air generated in the energy storage device 300 flows into the flow channel 42333 through the end of the flow channel 42333 facing away from the supporting portion 422, flows into the side of the supporting portion 422 facing away from the top cover 410 through the through holes 42321 of the side plate 4232 after flowing through the flow channel 42333.

As can be appreciated, the concave portion 423 and the supporting portion 422 are arranged along the length direction of the plastic body 421.

Alternatively, the number of the concave portions 423 may be one or two, and when the number of the concave portions 423 is two, the two concave portions 423 are disposed on opposite sides of the supporting portion 422 along the length direction of the plastic body 421.

Alternatively, the surface of the recess 423 facing the top cover 410 is flush or coplanar with the surface of the support 422 facing the top cover 410. In this way, the surface of the plastic body 421 facing the top cover 410 is flat, and can be better attached to the second surface 412 of the top cover 410.

Optionally, the surface of the first reinforcement plate 42331 facing the top cover 410, the surface of the second reinforcement plate 42332 facing the top cover 410, and the surface of the support 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 flat, and can be better attached to the second surface 412 of the top cover 410.

In other words, the second reinforcement plate 42332 is closer to the first side 4211 of the plastic body 421 than the first reinforcement plate 42331. It can be further appreciated that the first reinforcing plate 42331 is closer to the middle of the recess 423 than the second reinforcing plate 42332 (e.g., the plastic body 421 is parallel to the predetermined central axis in the length direction, as shown by the dashed line O-O in fig. 12).

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 perpendicular to the side plates 4232, respectively.

It should be noted that the bottom plate 4231 protrudes from the supporting portion 422 toward a direction away from the top cover 410, and it is understood that a surface of the concave portion 423 facing away from the top cover 410 protrudes from a surface of the supporting portion 422 facing away from the top cover 410.

It should be noted that the recess 423 is used for the first insulating film 340 of the thermal fusion energy storage device 300, that is, the recess 423 is connected to the first insulating film 340.

Optionally, the first stiffener plate 42331 is disposed parallel to the second stiffener plate 42332. In other embodiments, first stiffening plate 42331 and second stiffening plate 42332 may also be angled.

Referring to fig. 8 and 9, optionally, the top cover 410 has explosion-proof holes 414 penetrating through the first surface 411 and the second surface 412, the supporting portion 422 has a plurality of through holes 4221 (e.g. fence holes) disposed at intervals, and the through holes 4221 penetrate through the surface of the supporting portion 422 facing the top cover 410 and the surface of the supporting portion 422 facing away from the top cover 410, respectively. The plurality of through holes 4221 at least partially overlap or overlap the explosion proof aperture 414, 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 aperture 414 on the second surface 412 are at least partially overlapped. The through hole 4221 is used for discharging the gas generated in the energy storage device 300 to the explosion-proof hole 414 through the through hole 4221 when the energy storage device 300 is in thermal runaway or has electrochemical reaction, and the explosion and pressure release occur through the explosion-proof hole 414, so as to improve the use safety of the energy storage device 300.

Referring to fig. 8 and 9, optionally, the end cap assembly 400 further includes an explosion-proof assembly 430, the explosion-proof assembly 430 includes an explosion-proof valve 431 and a protection sheet 432, the explosion-proof valve 431 and the protection sheet 432 are disposed in the explosion-proof hole 414 at intervals and are respectively connected to the top cap 410, and the explosion-proof valve 431 is disposed closer to the lower plastic 420 than the protection sheet 432. It will be appreciated that the orthographic projection of the explosion proof valve 431 on the second surface 412 is at least partially layered with the orthographic projection of the plurality of through holes 4221 on the second surface 412. The explosion-proof valve 431 is provided with a notch (not shown) for timely blasting the explosion-proof valve 431 when the air pressure in the energy storage device 300 reaches a preset value when the energy storage device 300 is in thermal runaway or has electrochemical reaction, so as to release pressure, improve the use safety of the energy storage device 300, and the protection sheet 432 is used for protecting the explosion-proof valve 431 to avoid the explosion-proof valve 431 from being punctured when the explosion-proof valve 431 does not reach the blasting condition.

In this embodiment, the recess 423 is provided with the circulation channel 42333, and the circulation channel 42333 is communicated with one side of the supporting portion 422 away from the top cover 410, so as to be capable of being communicated with the plurality of through holes 4221 of the supporting portion 422, when the energy storage device 300 is subject to thermal runaway or electrochemical reaction, a part of the gas generated in the energy storage device 300 flows to the surface of the supporting portion 422 away from the top cover 410 through the circulation channel 42333, so that the gas can be split, the gas pressure in the energy storage device 300 is dispersed and balanced, the pressure on the top cover 410, which is suffered by the explosion-proof component 430, is reduced, and the use safety of the energy storage device 300 is improved. In addition, the edge of the circulation channel 42333 is provided with the first reinforcing plate 42331 and the second reinforcing plate 42332, so that the strength of the concave portion 423 can be improved, the concave portion 423 can better support the first insulating film 340, the lower plastic 420 is better prevented from being deformed, the use safety of the energy storage device 300 is improved, the weight of the lower plastic 420 can be better reduced, and the weight of the energy storage device 300 is reduced.

Referring to fig. 12 and 13 again, in some embodiments, the recess 423 includes two first reinforcing elements 4233, the two first reinforcing elements 4233 are disposed at intervals along the width direction of the plastic body 421, the flow channel 42333 includes a first flow channel 42333a and a second flow channel 42333b, one of the two first reinforcing elements 4233 has a first flow channel 42333a, the other one of the two first reinforcing elements 4233 has a second flow channel 42333b, the first flow channel 42333a has a first central axis (as dashed line MM in fig. 12), the second flow channel 42333b has a second central axis (as dashed line NN in fig. 12), and the first central axis and the second central axis are both parallel to the length direction;

The number of the protruding columns 424 is plural, a part of the protruding columns 424 is located at two sides of the first central axis, and a part of the protruding columns 424 is located at two sides of the second central axis.

In this embodiment, two first reinforcing members 4233 are provided, a portion of the protruding columns 424 are located at two sides of the first central axis, and a portion of the protruding columns 424 are located at two sides of the second central axis. The strength of each position of the concave portion 423 can be balanced, and the whole has higher strength. In addition, through setting up the first insulating film 340 of support that second enhancement subassembly 4234 can be better, when the depressed part 423 was pulled by first insulating film 340, the atress of depressed part 423 that can be better dispersed, avoid lower plastic 420 to take place to warp, improves the security of energy storage device 300 use.

Referring again to fig. 12 and 13, in some embodiments, along the thickness direction of the top cover 410, the protruding columns 424 protrude from the first reinforcing component 4233 toward the top cover 410.

It can be appreciated that the protruding columns 424 protrude from the first reinforcement plate 42331 and the second reinforcement plate 42332 toward the top cover 410.

In this embodiment, the protruding pillar 424 protrudes from the first reinforcing member 4233 toward the top cover 410. Therefore, the protruding 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 concave portion 423 is better supported, collapse of the circulation channel 42333 is prevented, and the use safety of the energy storage device 300 is improved.

Referring to fig. 13, in some embodiments, the number of the protrusions 424 is plural, the number of the grooves 413 is plural, the protrusions 424 are disposed corresponding to the grooves 413, the plurality of the protrusions 424 include a first protrusion 424a, the first protrusion 424a is disposed on a surface of the bottom plate 4231 facing the top cover 410, the first protrusion 424a is connected to the first reinforcing plate 42331, and the first protrusion 424a protrudes toward the flow channel 42333 compared to the first reinforcing plate 42331.

As can be appreciated, the first protrusion 424a protrudes toward a direction closer to the second reinforcement plate 42332 than the first reinforcement plate 42331.

It will be appreciated that the first protrusion 424a also protrudes from the surface of the first reinforcement plate 42331 facing the top cover 410. In other words, the height of the first protrusion 424a is greater than the height of the first reinforcing plate 42331 along the thickness direction of the plastic body 421. It will also be appreciated that the first protrusion 424a protrudes from the surface of the plastic body 421 facing the top cover 410.

Alternatively, the radial dimension of the first protrusion 424a is greater than the thickness of the first reinforcing plate 42331 (i.e., the dimension of the first reinforcing plate 42331 along the width direction of the plastic body 421). Therefore, the connection strength between the first boss 424a and the top cover 410 can be improved, the concave portion 423 can be better supported, and the first boss 424a can be better protruded towards the direction of the circulation channel 42333, so that the air flow flowing through the circulation channel 42333 can be better disturbed, and the air pressure in the circulation channel 42333 can be balanced. In addition, the first protruding pillar 424a is disposed on one side of the flow channel 42333, so that when the energy storage device 300 is thermally out of control or undergoes an electrochemical reaction, the first protruding pillar 424a can better support the top cover 410, preventing the flow channel 42333 from collapsing, and improving the safety of the energy storage device 300.

In the present embodiment, the first reinforcing plate 42331 is provided with the first boss 424a, so that the first boss 424a protrudes from the flow channel 42333. The first reinforcing plate 42331 is connected to the first boss 424a, which not only can improve the strength of the first reinforcing plate 42331, but also can improve the strength of the first boss 424a, so that the connection between the recess 423 and the top cover 410 is more stable, and in addition, the first boss 424a protrudes out of the flow channel 42333, so that the air flow in the flow channel 42333 can be disturbed, the air pressure in the flow channel 42333 can be balanced better, and the use safety of the energy storage device 300 is improved.

Referring to fig. 12 and 13 again, in some embodiments, the plastic body 421 has a predetermined central axis (shown by a dotted line O-O in fig. 12) parallel to the length direction, and the first reinforcing plate 42331 and the first boss 424a are located on the same side of the predetermined central axis.

It can be appreciated that when the first reinforcing members 4233 are multiple groups, the first protrusion 424a adjacent to each group of the first reinforcing members 4233 is located on the same side of the predetermined central axis as the first reinforcing plate 42331 of the first reinforcing member 4233.

Optionally, the first reinforcing plate 42331 and the first boss 424a are disposed close to the preset central axis.

In this embodiment, the first reinforcing plate 42331 and the first boss 424a are disposed at a position close to the preset central axis, so that the concave portion 423 can be better reinforced and supported, and the lower plastic 420 can be better prevented from being pulled by the first insulating film 340 to deform, thereby improving the use safety of the energy storage device 300.

As shown in fig. 12 and 13, in some embodiments, the first boss 424a has a flow guiding surface 4241a, and the flow guiding surface 4241a faces the flow channel 42333.

Alternatively, the flow guiding surface 4241a may be at least one of, but not limited to, a cylindrical arc surface, an inclined surface, and the like.

In this embodiment, the first boss 424a protrudes toward the flow channel 42333 compared to the first reinforcing plate 42331, and by providing the flow guiding surface 4241a on the first boss 424a, the air flowing through the flow channel 42333 can be better guided and disturbed, so as to balance the air pressure in the flow channel 42333.

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

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

Therefore, the protruding 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 concave portion 423 is better supported, collapse of the circulation channel 42333 is prevented, and the use safety of the energy storage device 300 is improved.

In some embodiments, the number of the protruding columns 424 is plural, the protruding columns 424 are disposed at intervals, and a part of the protruding columns 424 are located on the same line, and the line is parallel to the width direction of the plastic body 421.

Alternatively, the plurality of posts 424 disposed on the same recess 423 are located on the same line, and the line is parallel to the width direction of the plastic body 421.

In this embodiment, a portion of the plurality of protruding columns 424 are located on the same straight line, and the straight line is parallel to the width direction of the plastic body 421. Therefore, the connection strength between 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 to the lower plastic 420 can be better dispersed, the short circuit between the positive pole piece 321 and the negative pole piece 323 can be better avoided after the deformation of the lower plastic 420, and the potential safety hazard can be better avoided, so that the use safety of the energy storage device 300 can be better improved.

Referring to fig. 12 and 13 again, in some embodiments, the recess 423 further includes a second reinforcing member 4234, the second reinforcing member 4234 is disposed on the same side of the bottom plate 4231 as the first reinforcing member 4233, the second reinforcing member 4234 includes a third reinforcing plate 42341, the third reinforcing plate 42341 is disposed on a side of the side plate 4232 away from the supporting portion 422 and is 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.

In this embodiment, the strength of the concave portion 423 can be improved by providing the third reinforcing plate 42341, and the third reinforcing plate 42341 is used for hot melt bonding the first insulating film 340, so that the bonding area between the first insulating film 340 and the concave portion 423 can be increased, and the connection strength between the first insulating film 340 and the concave portion 423 can be improved.

Referring to fig. 12 and 13 again, in some embodiments, the plastic body 421 has a predetermined central axis parallel to the length direction, the recess 423 includes at least two first reinforcing members 4233, the at least two first reinforcing members 4233 are disposed at intervals along the width direction of the plastic body 421, and the at least two first reinforcing members 4233 are disposed symmetrically with respect to the predetermined central axis along the width direction, the recess 423 further includes a second reinforcing member 4234, the second reinforcing member 4234 and the first reinforcing member 4233 are disposed on the same side of the bottom plate 4231, and the second reinforcing member 4234 is disposed between two adjacent first reinforcing members 4233 and is respectively connected to the first reinforcing plates 42331 of the two first reinforcing members 4233.

The second reinforcement member 4234 is connected to the first insulating film 340. It will be appreciated that the bottom panel 4231, side panels 4232, first stiffening member 4233 and second stiffening member 4234 are of unitary construction.

It will be appreciated that the number of second stiffening members 4234 is at least one. One of the second stiffening members 4234 is disposed between each of the adjacent two first stiffening members 4233.

In this embodiment, by arranging the two first reinforcing members 4233 and the second reinforcing member 4234, and making the two first reinforcing members 4233 symmetrically arranged along the preset central axis, the strength of each position of the concave portion 423 can be balanced, and the overall strength is higher. In addition, through setting up the first insulating film 340 of support that second enhancement subassembly 4234 can be better, when the depressed part 423 was pulled by first insulating film 340, the atress of depressed part 423 that can be better dispersed, avoid lower plastic 420 to take place to warp, improves the security of energy storage device 300 use.

Referring to fig. 13 again, in some embodiments, the second reinforcement member 4234 includes a third reinforcement plate 42341, a third reinforcement plate 42341 is located on a side of the side plate 4232 away from the support portion 422 and is spaced apart from the side plate 4232 along the length direction, and opposite ends of the third reinforcement plate 42341 are respectively connected to two sides of the two first reinforcement plates 42331 of the two first reinforcement members 4233 facing away from the support portion 422.

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

It can be appreciated that the third reinforcing plate 42341 extends along the width direction of the plastic body 421, and the third reinforcing plate 42341 is disposed near the plastic body 421 and parallel to the predetermined central axis in the length direction.

Optionally, a third reinforcing plate 42341 is spaced apart from the side plate 4232.

The third reinforcing plate 42341 is used to connect the first insulating film 340 of the energy storage device 300. Optionally, a surface of the third reinforcing plate 42341 facing away from the side plate 4232 is used to connect the first insulating film 340 of the energy storage device 300.

The surface of the third reinforcing plate 42341 facing away from the supporting portion 422 serves as a portion of the end surface or the side surface of the lower plastic 420 along the length direction.

Referring again to fig. 13, in some embodiments, the second reinforcement assembly 4234 further comprises a fourth reinforcement plate 42342, wherein opposite ends of the fourth reinforcement plate 42342 are respectively connected to the third reinforcement plate 42341 and the side plate 4232.

It is appreciated that in this embodiment, the second stiffener assembly 4234 comprises a third stiffener plate 42341 and a fourth stiffener plate 42342.

Alternatively, when the recess 423 includes two first reinforcing members 4233, the fourth reinforcing plate 42342 is located between two first reinforcing plates 42331 of two adjacent first reinforcing members 4233.

It will be appreciated that the fourth reinforcement plate 42342 is also coupled to the base plate 4231.

It can be appreciated that the fourth reinforcement plate 42342 extends along the length direction of the plastic body 421. Optionally, the first stiffener 42331, the second stiffener 42332, and the fourth stiffener 42342 are all parallel to the predetermined central axis. In one embodiment, the fourth reinforcement plate 42342 is located on the predetermined central axis.

In this embodiment, the second reinforcing member 4234 includes a fourth reinforcing plate 42342, and the fourth reinforcing plate 42342 can better stabilize the third reinforcing plate 42341, so as to better prevent the third reinforcing plate 42341 from being pulled by the first insulating film 340 and deformed, thereby improving the use safety of the energy storage device 300.

Referring again to fig. 12 and 13, in some embodiments, the plurality of posts 424 further includes a second post 424b, and the second post 424b is disposed on a surface of the bottom plate 4231 facing the top cover 410.

In this embodiment, by providing the second protruding columns 424b, the connection strength between the edge position of the concave portion 423 and the edge position of the top cover 410 can be better enhanced, and the structural strength of the concave portion 423 is improved, so that the lower plastic 420 can be better prevented from being pulled by the first insulating film 340 to deform, and the use safety of the energy storage device 300 is improved.

In some embodiments, the second post 424b is located on a side of the second stiffener plate 42332 facing away from the first stiffener plate 42331.

It will be appreciated that the second stud 424b is closer to the first side 4211 than the second reinforcement plate 42332. It will also be appreciated that in this embodiment, the second post 424b is located between the second reinforcement plate 42332 and the first side 4211.

It will be appreciated that the second protrusion 424b also protrudes from the surface of the second reinforcement plate 42332 facing the top cover 410. In other words, the height of the second protrusion 424b is greater than the height of the second reinforcing plate 42332 along the thickness direction of the plastic body 421. It will be further appreciated that the second protrusion 424b protrudes from the surface of the plastic body 421 facing the top cover 410.

It is understood that the first and second bosses 424a, 424b are located on opposite sides of the flow channel 42333, respectively.

In some embodiments, the recess 423 is provided with two first posts 424a and two second posts 424b, i.e., the recess 423 is provided with four posts 424. The two first protrusions 424a and the two second protrusions 424b are sequentially spaced apart in a direction parallel to the width direction. In other words, the two first protrusions 424a and the two second protrusions 424b are disposed on the same line.

In this embodiment, the second boss 424b is disposed such that the second boss 424b is located on a side of the second reinforcing plate 42332 facing away from the first reinforcing plate 42331. The connection strength between the edge of the recess 423 and the edge of the top cover 410 can be better enhanced, so that the structural strength of the recess 423 is improved, and the lower plastic 420 can be better prevented from being pulled by the first insulating film 340 to deform, thereby improving the use safety of the energy storage device 300. In addition, the second protruding column 424b is disposed on the other side of the flow channel 42333, so that when the energy storage device 300 is in thermal runaway or has electrochemical reaction, the second protruding column 424b can better support the top cover 410, prevent the flow channel 42333 from collapsing, and improve the use safety of the energy storage device 300.

Fig. 14 is a schematic structural diagram of a lower plastic 420 according to a second embodiment of the application. Fig. 15 is a plan view of the lower plastic 420 of the embodiment of fig. 14 according to the present application. Fig. 16 is a schematic structural diagram of a lower plastic 420 according to a third embodiment of the application. Fig. 17 is a plan view of the lower plastic 420 of the embodiment of fig. 16 according to the present application. Fig. 18 is a schematic structural diagram of a lower plastic 420 according to a fourth embodiment of the application. Fig. 19 is a plan view of the lower plastic 420 of the embodiment of fig. 18 according to the present application.

Referring to fig. 14 to 19, in some embodiments, the plurality of the protruding columns 424 further includes a second protruding column 424b, the second protruding column 424b is disposed on a surface of the bottom plate 4231 facing the top cover 410, the second protruding column 424b is connected to the second reinforcing plate 42332, and the second protruding column 424b protrudes toward the flow channel 42333 compared to the second reinforcing plate 42332.

As can be appreciated, the second boss 424b protrudes toward a direction closer to the first reinforcing plate 42331 than the second reinforcing plate 42332.

Optionally, the radial dimension of the second boss 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, the connection strength between the second boss 424b and the top cover 410 can be improved, the concave portion 423 can be better supported, and the second boss 424b can be better protruded towards the direction of the flow channel 42333, so that the air flow flowing through the flow channel 42333 can be better disturbed, and the air pressure in the flow channel 42333 can be balanced.

In the present embodiment, the second reinforcing plate 42332 is provided with the second boss 424b, so that the second boss 424b protrudes from the flow channel 42333. The second reinforcing plate 42332 is connected to the second boss 424b, which not only can improve the strength of the second reinforcing plate 42332, but also can improve the strength of the second boss 424b, so that the connection between the recess 423 and the top cover 410 is more stable, and in addition, the second boss 424b protrudes out of the flow channel 42333, so that the air flow in the flow channel 42333 can be disturbed, the air pressure in the flow channel 42333 can be balanced better, and the use safety of the energy storage device 300 is improved.

Referring again to fig. 13, in some embodiments, a portion of the third reinforcement plate 42341 protrudes toward the flow channel 42333.

It will be appreciated that another portion of the third reinforcement plate 42341 is offset from the flow channel 42333.

In this embodiment, a part of the third reinforcing plate 42341 protrudes toward the flow channel 42333, and another part is offset from the flow channel 42333. This can increase the welding area between third reinforcement plate 42341 and first insulating film 340, and improve the connection strength between third reinforcement plate 42341 and first insulating film 340. In addition, the strength of the concave portion 423 can be improved, and the deformation of the lower plastic 420 can be prevented better. Furthermore, when the energy storage device 300 is out of control or has an electrochemical reaction, the position of the circulation channel 42333 near the preset central axis has a larger airflow than the position far from the preset central axis (i.e. the position near the first side 4211), so as to increase the turbulence effect of the position of the circulation channel 42333 near the preset central axis, balance the air pressure in the circulation channel 42333, and improve the use safety of the energy storage device 300.

Referring to fig. 12 to 19, in other embodiments, the plurality of posts 424 includes a first post 424a, the first post 424a is disposed on a surface of the bottom plate 4231 facing the top cover 410, the first post 424a is connected to the first reinforcing plate 42331 and the first post 424a protrudes toward the flow channel 42333 compared to the first reinforcing plate 42331, and the width of the third reinforcing plate 42341 protruding from the flow channel 42333 is greater than the width of the first post 424a protruding from the flow channel 42333.

In this embodiment, the width of the third reinforcing plate 42341 protruding from the flow channel 42333 is greater than the width of the first protrusion 424a protruding from the flow channel 42333. Compared with the first protruding column 424a, the third reinforcing plate 42341 is closer to the inlet of the flow channel 42333, when the battery is in thermal runaway or electrochemical reaction, the protruding portion of the third reinforcing plate 42341 can better drive the airflow to the position of the flow channel 42333, which is close to the second reinforcing plate 42332, so as to play a better role in turbulence, and when the airflow enters the flow channel 42333, the second turbulence is performed through the first protruding column 424a, so that the air pressure in the flow channel 42333 can be better balanced, and the use safety of the energy storage device 300 is improved.

Referring to fig. 13, 14, 16 and 18, in other embodiments, the first reinforcing member 4233 further includes a fifth reinforcing plate 42334, a fifth reinforcing plate 42334 is disposed on a surface of the bottom plate 4231 facing the top cover 410 in a protruding manner, the fifth reinforcing plate 42334 is disposed on a side of the second reinforcing plate 42332 facing away from the first reinforcing plate 42331, and opposite ends of the fifth reinforcing plate 42334 are respectively connected to the second reinforcing plate 42332 and the side plate 4232.

The surface of the fifth reinforcing plate 42334 facing away from the second reinforcing plate 42332 is a part of the side surface of the concave portion 423. A portion of a surface of fifth reinforcement plate 42334 facing away from second reinforcement plate 42332 is formed as part of first side 4211.

It can be appreciated that in the present embodiment, at least a portion of the first reinforcing members 4233 on the concave portion 423 includes a first reinforcing plate 42331, a second reinforcing plate 42332, and a fifth reinforcing plate 42334.

Optionally, the fifth reinforcing plate 42334 has a part of an arc structure and a part of a plane structure. As shown in fig. 13, it can be appreciated that the fifth reinforcement panel 42334 includes an arcuate segment 42334a and a straight segment 42334b connected to each other, the arcuate segment 42334a being connected to the second reinforcement panel 42332, the straight segment 42334b being connected to the side panel 4232.

In this embodiment, the fifth reinforcing plate 42334 connects the second reinforcing plate 42332 and the side plate 4232 at opposite ends of the fifth reinforcing plate 42334 respectively, so that the strength of the second reinforcing plate 42332 and the side plate 4232 can be improved, and the strength of the recess 423 can be improved, and when the second boss 424b is connected with the second reinforcing plate 42332, the strength of the second boss 424b can be improved, the connection strength between the lower plastic 420 and the top cover 410 can be improved, the deformation of the lower plastic 420 can be prevented, and the use safety of the energy storage device 300 can be improved.

Referring to fig. 13, 18, and 20, in other embodiments, the first reinforcing member 4233 further includes a sixth reinforcing plate 42335, a sixth reinforcing plate 42335 is disposed on a surface of the bottom plate 4231 facing the top cover 410, the sixth reinforcing plate 42335 is disposed on a side of the second reinforcing plate 42332 facing away from the first reinforcing plate 42331, and the fifth reinforcing plate 42334 is connected to the sixth reinforcing plate 42335.

It can be appreciated that in this embodiment, at least a portion of the first stiffener 4233 on the recess 423 includes a first stiffener plate 42331, a second stiffener plate 42332, a fifth stiffener plate 42334, and a sixth stiffener plate 42335.

Alternatively, the number of the sixth reinforcement plates 42335 may be one or more, and when the number of the sixth reinforcement plates 42335 is plural, the plurality of sixth reinforcement plates 42335 may be disposed at intervals or may be connected as shown in fig. 20.

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

Referring to fig. 14 and 15 again, the number of the concave portions 423 is two, the two concave portions 423 are respectively located at opposite ends of the supporting portion 422, and the first reinforcing member 4233 of one of the two concave portions 423 includes the sixth reinforcing plate 42335.

It will be appreciated that the first reinforcement member 4233 of the other of the two recesses 423 includes the sixth reinforcement plate 42335.

It is further understood that the first stiffener 4233 of one of the two recesses 423 includes a first stiffener plate 42331, a second stiffener plate 42332, a fifth stiffener plate 42334, and the sixth stiffener plate 42335, and the first stiffener 4233 of one of the two recesses 423 includes a first stiffener plate 42331, a second stiffener plate 42332, and a fifth stiffener plate 42334.

In other embodiments, when the recess 423 includes at least two first reinforcing members 4233, among the at least two first reinforcing members 4233 of the same recess 423, a portion of the first reinforcing members 4233 includes a first reinforcing plate 42331, a second reinforcing plate 42332, a fifth reinforcing plate 42334, and the sixth reinforcing plate 42335, and a portion of the first reinforcing members 4233 includes a first reinforcing plate 42331, a second reinforcing plate 42332, and a fifth reinforcing plate 42334.

In this embodiment, the weight and cost of the end cap assembly 400 can be better reduced by different structural designs of the first reinforcing members 4233 on the two concave portions 423. In addition, the first reinforcing members 4233 of the two concave portions 423 are different in structure, and can also play a foolproof role when the end cap assembly 400 is assembled.

Referring to fig. 21, in some embodiments, the number of the concave portions 423 is two, the two concave portions 423 are respectively located at opposite ends of the supporting portion 422, the first reinforcing member 4233 of one of the two concave portions 423 includes the sixth reinforcing plate 42335, the plurality of the protruding columns 424 further includes a second protruding column 424b, the second protruding column 424b is disposed on a 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 disposed at a distance from the second reinforcing plate 42332.

Optionally, the second reinforcing plate 42332 of the first reinforcing member 4233, which is composed of the first reinforcing plate 42331, the second reinforcing plate 42332, and the fifth reinforcing plate 42334, is connected to the second boss 424 b.

In the present embodiment, the difference design of the structures of the first reinforcing members 4233 on the two concave portions 423 is designed according to the difference of the positional relationship between the second reinforcing plates 42332 of the first reinforcing members 4233 of the two concave portions 423 and the second protruding columns 424b, so as to achieve a better foolproof effect.

Referring to fig. 14 and 15 again, the number of the concave portions 423 is two, the two concave portions 423 are respectively located at opposite ends of the supporting portion 422, the first reinforcing member 4233 of one of the two concave portions 423 includes the sixth reinforcing plate 42335, the plurality of protruding columns 424 further includes a second protruding column 424b disposed on a 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 connected to the second reinforcing plate 42332 and protrudes out of the flow channel 42333.

It can be appreciated that the sixth reinforcement plate 42335 connects the second post 424b and the second reinforcement plate 42332.

In this embodiment, by providing the sixth reinforcing plate 42335, the second reinforcing plate 42332 and the fifth reinforcing plate 42334 can be better connected together, so that the whole has better strength, and in addition, the sixth reinforcing plate 42335 is connected to the second boss 424b, so as to better strengthen the second boss 424 b. Furthermore, the second protrusion 424b protruding from the flow channel 42333 can better disturb the airflow flowing through the flow channel 42333, and balance the air pressure in the flow channel 42333.

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

It will be appreciated that the second protrusion 424b also protrudes from the surface of the sixth reinforcement plate 42335 facing the top cover 410. In other words, the height of the second protrusion 424b is greater than the height of the sixth reinforcement plate 42335 along the thickness direction of the plastic body 421. It will be further appreciated that the second protrusion 424b protrudes from the surface of the plastic body 421 facing the top cover 410.

In this embodiment, by providing the sixth reinforcing plate 42335, the second reinforcing plate 42332 and the fifth reinforcing plate 42334 can be better connected together, so that the whole has better strength, and in addition, the sixth reinforcing plate 42335 is connected to the second boss 424b, so as to better strengthen the second boss 424 b.

Referring to fig. 10, 12-15, 18, 19, 20 and 21, in some embodiments, the sixth reinforcement plate 42335 is connected to the second reinforcement plate 42332, and the sixth reinforcement plate 42335 has an intersection with the second reinforcement plate 42332.

In this embodiment, the sixth reinforcing plate 42335 is connected to the second reinforcing plate 42332, so that the structural strength of the sixth reinforcing plate 42335 and the second reinforcing plate 42332 can be improved, the structural strength of the recess 423 can be improved, and the lower plastic 420 can be better prevented from being pulled by the first insulating film 340 to deform.

Referring to fig. 15, 18, 19 and 20, in some embodiments, the plurality of posts 424 further includes a second post 424b, and the second post 424b is located at an intersection of the sixth reinforcement plate 42335 and the second reinforcement plate 42332.

In this embodiment, the second protruding pillar 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 protruding pillar 424b, so that the second protruding pillar 424b has better structural strength, and better bonding strength between the lower plastic 420 and the top cover 410.

Referring to fig. 12 again, in some embodiments, the plastic body 421 has a length direction, a width direction, a first side 4211 extending along the length direction, and a second side 4212 extending along the width direction, the plurality of posts 424 further includes a second post 424b, the second posts 424b are disposed at opposite ends of the plastic body 421 along the length direction, the second post 424b at one end of the plastic body 421 along the length direction includes a first sub-post 424b1, the second post 424b at the other end of the plastic body 421 along the length direction includes a second sub-post 424b2, the distance between the first sub-post 424b1 and the first side 4211 is different from the distance between the second sub-post 424b2 and the first side 4211, and/or the distance between the first sub-post 424b1 and the second side 4212 is different from the second sub-post 424b2 and the second side 4212.

It can be appreciated that the plastic body 421 is provided with the second protruding columns 424b at two opposite ends along the length direction, the second protruding columns 424b at two opposite ends of the plastic body 421 along the length direction are different from the first side 4211, and/or the second protruding columns 424b at two opposite ends of the plastic body 421 along the length direction are different from the second side 4212.

It can be understood that in the present embodiment, the plastic body 421 includes two concave portions 423 and a supporting portion 422, and the two concave portions 423 are respectively located at two opposite ends of the supporting portion 422. The two concave portions 423 are respectively provided with a second convex column 424b, and the distances between the two second convex columns 424b arranged in the two concave portions 423 and the second side 4212 are different from the distances between the two second convex columns 424b of the first side 4211 and the second side 4212.

In this embodiment, the distance between the second protruding columns 424b on the two concave portions 423 and the first side 4211 is different, and/or the distance between the second protruding columns 424b on the two concave portions 423 and the second side 4212 is different, so that the foolproof effect of assembling the lower plastic 420 and the top cover 410 can be achieved without adding a new structural design, and the reverse assembling of the top cover 410 and the lower plastic 420 can be better avoided, and the assembling efficiency of the end cover assembly 400 is improved.

Referring to fig. 12, 14, 16 and 18, in some embodiments, the plurality of posts 424 further includes a plurality of third posts 424c, and the plurality of third posts 424c are disposed at intervals on a surface of the support portion 422 facing the top cover 410. Optionally, the arrangement of the plurality of third protruding columns 424c is symmetrically disposed along a preset central axis and symmetrically disposed along a central axis parallel to the width direction.

In a particular example, the plurality of posts 424 includes eight third posts 424c.

In one embodiment, the lower plastic 420 includes four first posts 424a, four second posts 424b, and eight third posts 424c. It should be noted that the drawing only shows that the lower plastic 420 includes four first posts 424a, four second posts 424b, and eight third posts 424c. In other embodiments, the lower plastic 420 may further include other numbers of first posts 424a, second posts 424b, and third posts 424c, and the number illustrated in the drawings should not be construed as limiting the lower plastic 420 and posts 424 of the present application.

In some embodiments, the plurality of posts 424 are symmetrically disposed along a predetermined central axis. In other embodiments, the plurality of posts 424 are symmetrically disposed along a central axis parallel to the width direction. In still other embodiments, the plurality of posts 424 are symmetrically disposed along a predetermined central axis and symmetrically disposed along a central axis parallel to the width direction.

Fig. 22 is an exploded view of a second embodiment of an end cap assembly 400 according to the present application. Fig. 23 is an exploded view of an alternative view of an end cap assembly 400 according to a second embodiment of the present application. Fig. 24 is an exploded view of a third embodiment of an end cap assembly 400 according to the present application. Fig. 25 is an exploded view of an alternative view of an end cap assembly 400 according to a third embodiment of the present application. Fig. 26 is an exploded view of a fourth embodiment of an end cap assembly 400 according to the present application. Fig. 27 is an exploded view of an alternative view of an end cap assembly 400 according to a fourth embodiment of the present application. Fig. 28 is a schematic structural diagram of a pole 460 according to an embodiment of the application.

Referring to fig. 8, 9, and 22-28, in some embodiments, the end cap assembly 400 further includes:

A metal compression ring 440, wherein the metal compression ring 440 is disposed at a side of the top cover 410 facing away from the lower plastic 420;

an upper plastic 450 disposed between the metal pressing ring 440 and the top cover 410 for insulating the metal pressing ring 440 from the top cover 410;

the pole 460, the pole 460 includes a flange portion 461 and a penetrating post 462 protruding from the flange portion 461, the flange portion 461 is located at a side of the lower plastic 420 away from the top cover 410, and the penetrating post 462 sequentially penetrates through the lower plastic 420, the top cover 410, the upper plastic 450 and the metal pressure ring 440 and is electrically connected with the metal pressure ring 440;

a seal ring 470, wherein the seal ring 470 is arranged between the flange 461 and the lower plastic 420 and is sleeved on the periphery of the penetrating column 462, and

The switching piece 480 is positioned on one side of the flange portion 461 away from the lower plastic 420, and is electrically connected with the flange portion 461.

Alternatively, the metal compression ring 440 may be an anode metal compression ring 440a or a cathode metal compression ring 440b, the pole 460 may be a first pole 460a or a second pole 460b, the adapter piece 480 may be an anode adapter piece 480a or a cathode adapter piece 480b, the anode adapter piece 480a is used for electrically connecting with an anode tab of the anode pole piece 321, and the cathode adapter piece 480b is used for electrically connecting with a cathode tab of the cathode pole piece 323. When the metal press ring 440 is the positive metal press ring 440a, the pole 460 is a first pole 460a, the first pole 460a is a positive pole, the adapter piece 480 is a positive adapter piece 480a, and when the metal press ring 440 is the negative metal press ring 440b, the pole 460 is a second pole 460b, the second pole 460b is a negative pole, and the adapter piece 480 is a negative adapter piece 480b.

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

Alternatively, the first mark may be at least one of, but not limited to, a color, a pattern, and the like.

Alternatively, the second identifier may be, but is not limited to, at least one of a color, a pattern, etc.

In this embodiment, the first identifier is set on the first pole 460a, the second identifier is set on the second pole 460b, and the first identifier is different from the second identifier, so that when the end cover assembly 400 is assembled, machine vision detection and identification (abbreviated as CCD identification) can be better performed, and thus the first pole 460a and the second pole 460b can be better prevented from being reversely assembled, and the assembly efficiency of the end cover assembly 400 can be improved.

In a specific example, the colors of the first pole 460a and the second pole 460b are different, so that when the end cover assembly 400 is assembled, machine vision detection recognition (CCD recognition for short) can be better performed, and thus the reverse assembly of the first pole 460a and the second pole 460b can be better avoided, the anti-fool effect is good, and the assembly efficiency of the end cover assembly 400 can be improved.

In some embodiments, the end cover assembly 400 further includes a heat insulating sheet 490 disposed between the switching sheet 480 and the lower plastic 420, for avoiding welding of the switching sheet 480 and the pole 460, charging/discharging of the energy storage device 300, thermal runaway, etc., and transferring heat generated by the switching sheet 480 and the pole 460 to the lower plastic 420, so that the lower plastic 420 deforms, and safety of the energy storage device 300 is improved. Optionally, each of the opposite sides of the pole 460 is provided with a heat insulating sheet 490, i.e. two heat insulating sheets 490 are disposed at intervals on opposite sides of the pole 460.

Reference in the specification to "an embodiment," "implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the application may be combined with other embodiments. Furthermore, it should be understood that the features, structures or characteristics described in the embodiments of the present application may be combined arbitrarily without any conflict with each other, to form yet another embodiment without departing from the spirit and scope of the present application.

Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above-mentioned preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present application without departing from the spirit and scope of the technical solution of the present application.

Claims

1. An end cap assembly, said end cap assembly comprising:

2. The end cover assembly of claim 1, wherein the plastic body has a length direction, a width direction and a preset central axis parallel to the length direction, the plastic body comprises a supporting part and a concave part which are connected, the concave part is arranged at one end of the supporting part, the concave part comprises a bottom plate, a side plate and a first reinforcing component, the bottom plate, the side plate and the supporting part are sequentially bent and connected, and the bottom plate and the supporting part are respectively bent towards opposite directions compared with the side plate;

The first reinforcing component 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 are located on one side of the side plate, which faces away from the supporting part, the first reinforcing plate and the second reinforcing plate are arranged at intervals along the width direction, the first reinforcing plate and the second reinforcing plate are all extended along the length direction, the first reinforcing plate is closer to the preset central axis than the second reinforcing plate, a circulating channel is formed between the bottom plate, the side plate, the first reinforcing plate and the second reinforcing plate in a surrounding mode, and the circulating channel penetrates through the side plate, so that the circulating channel is communicated with one side of the supporting part, which faces away from the top cover.

3. The end cap assembly of claim 2, wherein the recess includes two first stiffening members spaced apart along a width of the plastic body, the flow channel includes a first flow channel and a second flow channel, one of the two first stiffening members has a first flow channel, the other of the two first stiffening members has a second flow channel, the first flow channel has a first central axis, the second flow channel has a second central axis, the first central axis and the second central axis are both parallel to the length direction;

4. The end cap assembly of claim 2, wherein the number of posts is a plurality and the number of grooves is a plurality, the posts are disposed corresponding to the grooves, the plurality of posts include a first post disposed on a surface of the base plate facing the top cap, the first post is connected to the first reinforcing plate and the first post protrudes toward the flow channel as compared to the first reinforcing plate.

5. The end cap assembly of claim 4, wherein the first reinforcement plate is on the same side of the predetermined central axis as the first boss.

6. The end cap assembly of claim 4, wherein the first boss has a flow-directing surface that faces the flow-through passage.

7. The end cap assembly of claim 1, wherein the plastic body includes a first reinforcing member, and wherein the boss protrudes from the first reinforcing member in a direction toward the top cap in a thickness direction of the top cap.

8. The end cap assembly of claim 1, wherein the number of the posts is plural, the plurality of the posts are spaced apart, and a portion of the plurality of the posts are positioned on a common line, the line being parallel to the width direction of the plastic body.

9. The end cap assembly of claim 2, wherein the recess further comprises a second reinforcing member disposed on the same side of the bottom plate as the first reinforcing member, the second reinforcing member comprising a third reinforcing plate disposed on a side of the side plate remote from the support portion and spaced apart from the side plate in a length direction, the third reinforcing plate connecting the first reinforcing plate.

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

11. The end cap assembly of claim 10, wherein a portion of the third reinforcing plate protrudes toward the flow channel.

12. The end cap assembly of claim 2, wherein the number of posts is a plurality and the number of grooves is a plurality, the posts being disposed in correspondence with the grooves, the plurality of posts further comprising a second post disposed on a surface of the base plate facing the top cap.

13. The end cap assembly of claim 12, wherein the second post is located on a side of the second reinforcing plate facing away from the first reinforcing plate.

14. The end cap assembly of claim 12, wherein the second boss is connected to the second reinforcing plate and the second boss projects toward the flow channel as compared to the second reinforcing plate.

15. The end cap assembly of claim 2, wherein the first reinforcing assembly further comprises a fifth reinforcing plate protruding from a top cap facing surface of the bottom plate, the fifth reinforcing plate being located on a side of the second reinforcing plate facing away from the first reinforcing plate, opposite ends of the fifth reinforcing plate being connected to the second reinforcing plate and the side plate, respectively.

16. The end cap assembly of claim 2, wherein the first reinforcing member further comprises a fifth reinforcing plate and a sixth reinforcing plate, the fifth reinforcing plate is disposed on a surface of the bottom plate facing the top cap in a protruding manner, the fifth reinforcing plate is disposed on a side of the second reinforcing plate facing away from the first reinforcing plate, opposite ends of the fifth reinforcing plate are respectively connected with the second reinforcing plate and the side plate, the sixth reinforcing plate is disposed on a surface of the bottom plate facing the top cap in a protruding manner, the sixth reinforcing plate is disposed on a side of the second reinforcing plate facing away from the first reinforcing plate, and the sixth reinforcing plate is connected with the fifth reinforcing plate.

17. The end cap assembly of claim 16, wherein the number of recesses is two, two of the recesses being located at opposite ends of the support portion, respectively, the first reinforcement assembly of one of the two recesses comprising the sixth reinforcement plate.

18. The end cap assembly of claim 17, wherein the number of posts is a plurality and the number of grooves is a plurality, the posts being disposed in correspondence with the grooves, the plurality of posts further comprising a second post disposed on a surface of the base plate facing the top cap;

19. The end cap assembly of claim 17, wherein the number of posts is a plurality and the number of grooves is a plurality, the posts being disposed in correspondence with the grooves, the plurality of posts further comprising a second post disposed on a surface of the base plate facing the top cap;

20. The end cap assembly of claim 16, wherein the sixth reinforcement panel is connected to the second reinforcement panel, the sixth reinforcement panel having an intersection with the second reinforcement panel.

21. The end cap assembly of claim 20, wherein the plurality of bosses further comprise a second boss located at an intersection of the second reinforcing plate and the sixth reinforcing plate.

22. The end cap assembly of claim 3, wherein the boss protrudes from the first reinforcement assembly in a direction toward the top cap in a thickness direction of the top cap.

23. The end cap assembly of claim 22, wherein the plastic body has a length direction, a width direction, a first side extending in the length direction, and a second side extending in the width direction, the number of the protrusions is plural, the number of the grooves is plural, the protrusions are disposed corresponding to the grooves, the plurality of the protrusions further comprises second protrusions, the plastic body is provided with the second protrusions at opposite ends in the length direction, the second protrusion at one end of the plastic body in the length direction comprises a first sub-protrusion, the second protrusion at the other end of the plastic body in the length direction comprises a second sub-protrusion, the distance between the first sub-protrusion and the first side is different from the distance between the second sub-protrusion and the first side, and/or the distance between the first sub-protrusion and the second side is different from the second sub-protrusion and the distance between the second sub-protrusion and the second side is different.

24. The end cap assembly of claim 1, wherein the plastic body has a length direction, a width direction, a first side extending in the length direction, and a second side extending in the width direction, the number of the protrusions is plural, the number of the grooves is plural, the protrusions are disposed corresponding to the grooves, the plurality of the protrusions further comprises second protrusions, the second protrusions are disposed at opposite ends of the plastic body in the length direction, the second protrusions at one end of the plastic body in the length direction comprise first sub-protrusions, the second protrusions at the other end of the plastic body in the length direction comprise second sub-protrusions, the distance between the first sub-protrusions and the first side is different from the distance between the second sub-protrusions and the first side is different from the distance between the first sub-protrusions and the second sub-protrusions is different from the distance between the second sub-protrusions and the second side.

25. An energy storage device, comprising:

a housing;

the end cap assembly of any one of claims 1-24, said end cap assembly and said housing enclosing a receiving cavity, and

26. The energy storage device of claim 25, wherein the end cap assembly further comprises a plurality of poles including a first pole and a second pole, the first pole and the second pole being electrically connected to the electrode assembly, respectively, the first pole having a first identification and the second pole having a second identification, the first identification being different from the second identification.

27. An electrical device, the electrical device comprising:

an apparatus body, and

The energy storage device of claim 25 or 26, for powering the apparatus body.