CN117080634B

CN117080634B - End cover assembly, energy storage device and electric equipment

Info

Publication number: CN117080634B
Application number: CN202311189532.XA
Authority: CN
Inventors: 肖和攀
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2023-09-15
Filing date: 2023-09-15
Publication date: 2023-12-22
Anticipated expiration: 2043-09-15
Also published as: CN117080634A

Abstract

The application provides an end cover subassembly, energy memory and consumer can make change piece and utmost point post realization detachable connection to can save laser welding procedure, and then help avoiding energy memory to appear leaking the problem of liquid. The end cover assembly comprises a top cover, a pole, a plastic part and a switching piece, wherein the top cover is provided with a mounting hole, the mounting hole penetrates through the top cover along the thickness direction of the top cover, the pole penetrates through the mounting hole, the plastic part comprises a plastic body and a butt joint part, the butt joint part is arranged on one side, deviating from the top cover, of the plastic body and is opposite to the pole, the switching piece is arranged on the surface, deviating from the top cover, of the plastic part, the switching piece comprises a switching part, the switching part is inserted between the butt joint part and the pole, and the switching part and the pole are mutually abutted.

Description

End cover assembly, energy storage device and electric equipment

Technical Field

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

Background

The secondary battery (Rechargeable battery) is also called a rechargeable battery or a storage battery, and is a battery that can be continuously used by activating an active material by charging after discharging the battery. The recyclable characteristic of the secondary battery gradually becomes a main power source of electric equipment, and as the demand of the secondary battery gradually increases, the performance requirements of people on all aspects of the secondary battery are also higher and higher, and particularly the energy density of the unit volume of the battery is required. In the existing battery, the adapter piece and the pole post are usually connected by adopting laser welding, so that the lower plastic is easily melted by welding temperature, the strength of the joint surface of the lower plastic and the top cover is reduced, and the battery leakage is caused.

Disclosure of Invention

The application provides an end cover subassembly, energy memory and consumer can make change piece and utmost point post realization detachable connection to can save laser welding procedure, and then help avoiding energy memory to appear leaking the problem of liquid.

In a first aspect, the present application provides an end cap assembly for use in an energy storage device. The end cover assembly comprises a top cover, a pole, a plastic part and a switching piece, wherein the top cover is provided with a mounting hole, the mounting hole penetrates through the top cover along the thickness direction of the top cover, the pole penetrates through the mounting hole, the plastic part comprises a plastic body, a butt joint part and a plurality of protruding columns, a part of the plastic body is fixedly connected between the pole and the top cover and surrounds the peripheral surface of the pole, the other part of the plastic body is positioned on the bottom surface of the top cover, the butt joint part is arranged on one side of the plastic body, which is away from the top cover, and is opposite to the surface, which is away from the top cover, of the pole, the butt joint part comprises a blocking strip and a butt joint protrusion, the blocking strip is fixedly connected to one side, which is away from the top cover, is spaced from the switching part, and is opposite to the switching part, and the butt joint protrusions are fixedly connected to the surface, which is away from the top cover, of the blocking strip and are spaced from each other; the switching piece is installed in the surface that the plastic part deviates from the top cap, the switching piece includes switching portion, main part and kink, switching portion inserts and locates between butt portion with the utmost point post, and with the utmost point post deviates from the surface of top cap with the butt portion all supports each other, main part fixed connection in one side of switching portion, main part is equipped with a plurality of fixed orificess, a plurality of the fixed orificess is followed the thickness direction of main part runs through main part, and each other interval sets up, kink fixed connection in main part with between the switching portion, main part accessible kink is relative the switching portion is crooked; each convex column penetrates through one fixing hole and is fixedly connected with the main body.

The surface of the top cover, the top surface of the top cover and the top surface and the bottom surface of the top cover are all provided with micropore structures, and at least part of the plastic part is filled with the micropore structures.

The plastic body comprises a main body part and an auxiliary part, the auxiliary part is fixedly connected to the main body part, the main body part is located between the pole and the top cover and surrounds the peripheral surface of the pole, the auxiliary part is located between the transfer sheet and the top cover, and the auxiliary part completely covers the transfer sheet.

In a second aspect, the present application provides an energy storage device comprising a housing and any one of the end cap assemblies described above, the housing being provided with an opening, the end cap assembly being mounted to the housing and closing the opening.

The energy storage device further comprises a bare cell, and the bare cell is arranged on the inner side of the shell; the shell comprises a main shell body and an insulating piece, wherein the main shell body accommodates the bare cell and the insulating piece, and the insulating piece protrudes relative to the inner surface of the main shell body and is positioned between the main shell body and the bare cell.

Wherein, the insulating part and the main casing body are integrally formed.

Wherein the inner surface of the main housing is provided with a microporous structure, and at least part of the insulating member fills the microporous structure.

The main shell comprises a bottom plate and a side shell, and the side shell is fixedly connected to one side of the bottom plate; the insulating piece comprises a plurality of first sub-insulating parts, a plurality of second sub-insulating parts, a plurality of third sub-insulating parts and a plurality of fourth sub-insulating parts, wherein the first sub-insulating parts and the second sub-insulating parts are arranged on the inner surface of the bottom plate, the first sub-insulating parts are sequentially arranged at intervals along the length direction of the main shell, and the second sub-insulating parts are sequentially arranged at intervals along the width direction of the main shell and are intersected with the first sub-insulating parts; the plurality of third sub-insulating parts and the plurality of fourth sub-insulating parts are all arranged on the inner surface of the side shell, the plurality of third sub-insulating parts are sequentially arranged at intervals in the height direction of the side shell, each third sub-insulating part is arranged around the circumference of the side shell, the plurality of fourth sub-insulating parts are sequentially arranged around the circumference of the side shell at intervals, and the third sub-insulating parts are intersected.

Each third sub-insulating part comprises a first face, a second face and a first chamfer face, the first face is the surface of the third sub-insulating part facing the opening, the second face is the surface of the third sub-insulating part facing away from the inner surface of the side shell, and the first chamfer face is connected between the second face and the first face; each fourth sub-insulation part comprises a third face, a fourth face and a second chamfer face, the third face is the surface of the fourth sub-insulation part facing the opening and parallel to the first face, the fourth face is the surface of the fourth sub-insulation part deviating from the inner surface of the side shell, the fourth face is coplanar with the second face and is intersected with the second face, and the second chamfer face is connected between the fourth face and the third face.

Each first sub-insulating part is provided with a first notch, and the first notch penetrates through the first sub-insulating parts along the length direction of the main shell; each third sub-insulating part is provided with a second notch, and the second notch penetrates through the third sub-insulating part along the height direction of the main shell.

In a third aspect, the application further provides an electric device, which comprises the energy storage device, and the energy storage device supplies power for the electric device.

In the technical scheme that this application provided, on the one hand, through set up the butt portion on the plastic spare, make change piece and utmost point post realize dismantling and be connected, can save laser welding process, both can simplify energy memory's production process flow, also can avoid the plastic spare because of receiving laser welding process's high temperature and melting to can strengthen the faying face intensity of plastic spare and top cap, avoid energy memory to appear the problem of weeping. On the other hand, the changeover piece is closely laminated in one side that the plastic part deviates from the top cap, can reduce the size of end cover subassembly's thickness direction to can increase energy storage device's altitude space, and then help improving energy storage device's energy density. Meanwhile, the insulation piece of the shell is used for replacing the Mylar film to isolate the bare cell from the main shell, insulation reliability between the bare cell and the shell is guaranteed, and the plastic piece is not required to be provided with a boss structure for welding the Mylar film, so that the size of the plastic piece in the thickness direction can be reduced, the height space of the energy storage device is increased, and further the energy density of the energy storage device is improved.

Drawings

In order to more clearly describe the technical solutions of the embodiments of the present application, the following description will describe the drawings that are required to be used in the embodiments of the present application.

FIG. 1 is a schematic diagram of a household energy storage system according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of an energy storage device of the household energy storage system of FIG. 1;

FIG. 3 is a schematic view of a housing of the energy storage device of FIG. 2;

FIG. 4 is an enlarged schematic view of region C of FIG. 3;

FIG. 5 is a schematic illustration of the structure of an end cap assembly of the energy storage device of FIG. 2;

FIG. 6 is an exploded view of the end cap assembly of FIG. 5;

FIG. 7 is a schematic cross-sectional view of the end cap assembly of FIG. 5 taken along line A-A;

FIG. 8 is a schematic view of the structure of the top cover of the end cap assembly of FIG. 5;

FIG. 9 is a schematic cross-sectional view of the top cover of FIG. 8 taken along line B-B;

FIG. 10 is a schematic view of the structure of the top cap, explosion protection valve, pole and plastic parts of the end cap assembly of FIG. 5;

FIG. 11 is a schematic view of the cap, explosion proof valve, pole and plastic part of FIG. 9 at another angle;

FIG. 12 is a schematic view of the end cap assembly of FIG. 5 at another angle;

FIG. 13 is a schematic view of the configuration of the first tab of the end cap assembly of FIG. 5;

Fig. 14 is a schematic view of the structure of the second switch tab of the end cap assembly of fig. 5.

The corresponding names of the reference numerals in the drawings are:

the energy storage device 1, the electric energy conversion device 2, the first user load 3, the second user load 4, the housing 110, the end cap assembly 120, the opening 110a, the housing cavity 110b, the main housing 111, the insulating member 112, the bottom plate 111a, the side housing 111b, the first sub-insulating portion 113, the second sub-insulating portion 114, the third sub-insulating portion 115, the fourth sub-insulating portion 116, the first face 115b, the second face 115c, the first chamfer face 115d, the third face 116a, the fourth face 116b, the second chamfer face 116c, the first notch 113a, the second notch 115a, the top cap 10, the explosion-proof valve 20, the plastic member 30, the post 40, the adapter piece 50, the mounting hole 11, the liquid injection hole 12, the explosion-proof hole 13, the escape groove 14, the first mounting hole 11a, the second mounting hole 11b, the first escape groove 14a, the second escape groove 14b, the first post 40a, the second post 40b, the first post 41, the first flange portion 42, the second post portion 43, the second flange portion 44, the first plastic piece 30a, the second plastic piece 30b, the first plastic body 39a, the first abutting portion 33, the first boss 34, the first barrier rib 331, the first abutting protrusion 332, the first main body portion 31, the first auxiliary portion 32, the second plastic body 39b, the second abutting portion 37, the second boss 38, the second barrier rib 371, the second abutting protrusion 372, the second main body portion 35, the second auxiliary portion 36, the first turning tab 50a, the second turning tab 50b, the first main body portion 51, the first turning portion 52, the first bending portion 53, the first fixing hole 54, the escape notch 55, the first concave portion 51a, the second main body portion 56, the second turning portion 57, the second bending portion 58, the second fixing hole 59, and the second concave portion 56a.

Detailed Description

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

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 present scheme provides an energy storage device 1, wherein a group of chemical batteries are arranged in the energy storage device 1, 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, namely, the electric energy generated by wind energy and solar energy is simply stored in the chemical batteries, and the stored electric quantity is released for use when the use of external electric energy reaches a peak, or is transferred to a place with short electric quantity for reuse.

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, the kind of corresponding energy storage device 1 includes:

(1) The large energy storage power station applied to the wind power and photovoltaic power station side can assist renewable energy sources to generate electricity to meet grid-connected requirements, and meanwhile, the utilization rate of the renewable energy sources is improved; 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 generating and absorbing new energy sources is solved, 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.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a household energy storage system according to an embodiment of the present application.

The embodiment of fig. 1 of the present application is illustrated by taking a household energy storage scenario in user side energy storage as an example. It should be noted that the energy storage device 1 is not limited to the household energy storage scenario. The application provides a household energy storage system, this household energy storage system include electric energy conversion device 2 (photovoltaic board), first user load 3 (street lamp), second user load 4 (for example household appliances such as air conditioner) etc. and energy storage device 1, energy storage device 1 is small-size tank, and accessible hanging mode is installed in outdoor wall. In particular, the photovoltaic panel can convert solar energy into electric energy during the low electricity price period, and the energy storage device 1 is used for storing the electric energy and supplying the electric energy to street lamps and household appliances for use during the electricity price peak or supplying power during the power failure/power outage of the power grid.

The number of the energy storage devices 1 may be plural, and the plurality of energy storage devices 1 may be connected in series or in parallel, and the plurality of energy storage devices 1 may be supported and electrically connected by using a separator (not shown). In the present embodiment, "a plurality of" means two or more. The energy storage device 1 may be further provided with an energy storage box for accommodating the energy storage device 1.

Alternatively, the energy storage device 1 may include, but is not limited to, a battery cell, a battery module, a battery pack, a battery system, and the like. The practical application form of the energy storage device 1 provided in the embodiment of the present application may be, but is not limited to, the listed products, and may also be other application forms, and the embodiment of the present application does not strictly limit the application form of the energy storage device 1. The embodiment of the present application will be described by taking the energy storage device 1 as a multi-core battery as an example. When the energy storage device 1 is a single battery, the energy storage device 1 may be at least one of a cylindrical battery, a prismatic battery, and the like.

Referring to fig. 2 and 3, fig. 2 is a schematic structural diagram of the energy storage device 1 in the household energy storage system shown in fig. 1, and fig. 3 is a schematic structural diagram of the housing 110 in the energy storage device 1 shown in fig. 2.

For convenience of description, the length direction of the energy storage device 1 is defined as the X-axis direction, the width direction of the energy storage device 1 is defined as the Y-axis direction, the height direction of the energy storage device 1 is defined as the Z-axis direction, and the X-axis direction, the Y-axis direction and the Z-axis direction are perpendicular to each other.

The energy storage device 1 includes a housing 110, a bare cell (not shown), and an end cap assembly 120. The housing 110 has an opening 110a and a housing chamber 110b, and the opening 110a communicates with the housing chamber 110b. The housing cavity 110b may be used to house a bare cell and an electrolyte. The bare cell is accommodated in the accommodating cavity 110b and immersed in the electrolyte. The end cap assembly 120 is mounted to one side of the housing 110 in the height direction (Z-axis direction in the drawing) of the energy storage device 1, and closes the opening. The energy storage device 1 is illustratively a square battery. In other embodiments, the energy storage device 1 may also be a cylindrical battery or other battery.

Referring to fig. 3 and 4 in combination, fig. 4 is an enlarged schematic view of region C in fig. 3.

The case 110 includes a main case 111 and an insulating member 112, and the insulating member 112 is located inside the main case 111 and protrudes toward the inside of the main case 111 with respect to the inner surface of the main case 111. In this embodiment, the insulator 112 is integrally formed with the main housing 111. Illustratively, the insulator 112 is formed by a process of nano injection molding (Nano Molding Technology, NMT). Specifically, the inner surface of the main housing 111 is provided with a microporous structure, and at least a portion of the insulating member 112 fills the microporous structure, so that the insulating member 112 is fixedly connected with the main housing 111.

The microporous structure was formed by using a T-treatment technique in a slightly acidic microetching environment. Wherein, the T treatment technology is a pretreatment technology of a nano injection molding process. Nano-scale pits, i.e., a microporous structure, may be formed in the inner surface of the main housing 111 by a T-process technique. In the nano injection molding process, molten plastic liquid can flow into the micropore structure of the main casing 111, and then molten plastic liquid is cooled to form the insulating part 112, so that the insulating part 112 made of plastic material and the main casing 111 made of metal material can be fixed.

In this embodiment, the insulating member 112 is disposed at the inner side of the main housing 111, and the insulating member 112 is used to isolate the bare cell from the main housing 111, so that no additional Mylar is required to be disposed in the energy storage device 1, and insulation reliability between the bare cell and the housing 110 can be ensured, thereby omitting the procedures of mounting and welding Mylar, and facilitating simplification of the production process flow of the energy storage device 1. Meanwhile, the insulator 112 is integrally formed with the main housing 111, which is also advantageous in increasing the inner space of the housing 110.

In this embodiment, the main housing 111 includes a bottom plate 111a and a side housing 111b, and the side housing 111b is fixedly connected to one side of the bottom plate 111 a. The side case 111b and the bottom plate 111a together define a housing cavity 110b. The insulator 112 includes a plurality of first sub-insulating portions 113, a plurality of second sub-insulating portions 114, a plurality of third sub-insulating portions 115, and a plurality of fourth sub-insulating portions 116. Wherein, the first sub-insulation portion 113 and the plurality of second sub-insulation portions 114 are provided on the inner surface of the bottom plate 111 a. The plurality of first sub-insulating portions 113 are sequentially arranged at intervals along the longitudinal direction (X-axis direction in the drawing) of the main casing 111. The plurality of second sub-insulating portions 114 are sequentially arranged at intervals in the width direction (Y-axis direction in the drawing) of the main casing 111, and are disposed so as to intersect the plurality of first sub-insulating portions 113.

The plurality of third sub-insulating parts 115 and the plurality of fourth sub-insulating parts 116 are provided on the inner surface of the side case 111 b. The plurality of third sub-insulating portions 115 are sequentially arranged at intervals in the height direction (the Z-axis direction in the drawing) of the side case 111 b. Each third sub-insulating part 115 is disposed around the circumferential direction of the side case 111 b. Each of the third sub-insulation portions 115 includes a first face 115b, a second face 115c, and a first chamfer face 115d, the first chamfer face 115d being connected between the first face 115b and the second face 115 c. The first surface 115b is a surface of the third sub-insulation portion 115 facing the opening 110a of the housing 110. The second face 115c is a surface of the third sub-insulating part 115 facing away from the inner surface of the side case 111b, and protrudes with respect to the inner surface of the side case 111 b. Illustratively, the second face 115c is parallel to the inner surface of the side shell 111 b.

The plurality of fourth sub-insulating portions 116 are sequentially arranged at intervals around the circumferential direction of the side case 111b, and are disposed to intersect the plurality of third sub-insulating portions 115. Each of the fourth sub-insulating parts 116 includes a third face 116a, a fourth face 116b, and a second chamfer face 116c, the second chamfer face 116c being connected between the third face 116a and the fourth face 116 b. The third surface 116a is disposed towards the opening 110a of the housing 110 and is parallel to the first surface 115 b. The fourth surface 116b is a surface of the fourth sub-insulating part 116 facing away from the inner surface of the side case 111b, and protrudes with respect to the inner surface of the side case 111 b. Illustratively, the fourth face 116b is parallel to the inner surface of the side shell 111 b. The fourth surface 116b is coplanar with the second surface 115c and intersects the second surface 115 c.

It can be appreciated that by providing the first chamfer surface 115d between the first surface 115b and the second surface 115c and providing the second chamfer surface 116c between the third surface 116a and the fourth surface 116b, that is, the connection between the first surface 115b and the second surface 115c and the connection between the third surface 116a and the fourth surface 116b are rounded, the die is prevented from being scratched by the insulating member 112 during the process of being mounted to the housing 110, and thus the use reliability of the die is ensured.

In addition, each of the first sub-insulation portions 113 is provided with a first notch 113a. The first cutouts 113a each penetrate the first sub-insulating portion 113 in the longitudinal direction (X-axis direction in the drawing) of the main case 111. Each of the third sub-insulation portions 115 may be provided with a second notch 115a. The second notches 115a each penetrate the third sub-insulating part 115 in the height direction (Z-axis direction in the drawing) of the main casing 111.

Under this setting, at the in-process that energy memory 1 pours into electrolyte into, can utilize first breach 113a and second breach 115a to carry out the drainage of electrolyte to make electrolyte can infiltrate naked electric core from all around evenly, thereby promote the efficiency and the infiltration homogeneity that electrolyte infiltrated naked electric core, and then be favorable to promoting energy memory 1's life.

Referring to fig. 5 to 7, fig. 5 is a schematic structural view of the end cap assembly 120 of the energy storage device 1 shown in fig. 2, fig. 6 is an exploded structural view of the end cap assembly 120 shown in fig. 5, and fig. 7 is a schematic sectional structural view of the end cap assembly 120 shown in fig. 5 taken along A-A. Where "cut along A-A" means a cut along a plane along A-A line, similar descriptions will be understood similarly hereinafter.

The end cap assembly 120 includes a top cap 10, an explosion proof valve 20, a plastic part 30, a pole 40 and an adapter piece 50. The explosion proof valve 20 and the post 40 are both mounted to the top cover. The plastic part 30 is located between the pole 40 and the top cover 10, and is fixedly connected between the pole 40 and the top cover 10, and is integrally formed with the pole 40 and the top cover 10. Illustratively, the post 40 and the cap 10 may be integrally formed by a nano-injection molding process. The plastic part 30 not only can ensure the assembly stability between the pole 40 and the top cover 10, but also can avoid direct contact conduction between the pole 40 and the top cover 10, thereby realizing insulation between the pole 40 and the top cover 10. The switching piece 50 is mounted on the surface of the plastic piece 30 facing away from the top cover 10 and is detachably connected with the pole 40.

Referring to fig. 8 and 9, fig. 8 is a schematic structural view of the top cover 10 of the end cover assembly 120 shown in fig. 5, and fig. 9 is a schematic sectional structural view of the top cover 10 shown in fig. 8 taken along the line B-B.

In this embodiment, the top cover 10 may be made of aluminum or an aluminum alloy material. Illustratively, the top cover may be made of 1000 series to 7000 series aluminum alloy. The surface of the top cover 10 facing the pole 40, and the top and bottom surfaces of the top cover 10 are all provided with a microporous structure. Wherein the microporous structure is made in a weakly acidic microetching environment using T-treatment techniques.

The top cover 10 is also provided with a mounting hole 11, a liquid injection hole 12, an explosion-proof hole 13 and an avoidance groove 14. Wherein, the mounting hole 11, the liquid injection hole 12 and the explosion-proof hole 13 all penetrate the top cover 10 along the thickness direction of the top cover 10, are arranged at intervals, and are communicated with the inside and the outside of the energy storage device 1. The electrolyte may be injected into the accommodating cavity of the housing 110 through the injection hole 12, so as to fill the electrolyte of the energy storage device 1. Illustratively, the explosion-proof hole 13 is an elliptical hole, and the liquid injection hole 12 is a circular hole. In other embodiments, the explosion proof holes 13 may be circular holes, square holes, or other shaped holes, and/or the injection holes 12 may be square holes or other shaped holes.

In this embodiment, there are two mounting holes 11, and the two mounting holes 11 are disposed at intervals from each other. The two mounting holes 11 are divided into a first mounting hole 11a and a second mounting hole 11b, the first mounting hole 11a is located at a side of the injection hole 12 facing away from the explosion-proof hole 13, and the second mounting hole 11b is located at a side of the explosion-proof hole 13 facing away from the injection hole 12 along a length direction (X-axis direction in the drawing) of the top cover 10.

In this embodiment, the avoiding groove 14 is provided around the mounting hole 11 and penetrates the wall surface of the mounting hole 11. The opening of the escape groove 14 is located at the end face of the top cover 10 in the thickness direction. In this embodiment, there are two escape grooves 14. The two avoidance grooves 14 are a first avoidance groove 14a and a second avoidance groove 14b, respectively. Specifically, the first avoiding groove 14a is provided around the first mounting hole 11a, and penetrates the hole wall surface of the first mounting hole 11 a. That is, the first escape groove 14a communicates with the first mounting hole 11 a. The second avoiding groove 14b is provided around the second mounting hole 11b and penetrates the hole wall surface of the second mounting hole 11 b. That is, the second escape groove 14b communicates with the second mounting hole 11 b.

Referring to fig. 10, fig. 10 is a schematic structural diagram of the top cover 10, the explosion-proof valve 20, the pole 40 and the plastic member 30 in the end cover assembly shown in fig. 5.

The explosion-proof valve 20 is installed in the explosion-proof hole 13 and fixedly connected to the wall of the explosion-proof hole 13. Illustratively, the explosion-proof valve 20 is fixedly connected to the wall of the explosion-proof hole 13 by welding so as to be mounted to the explosion-proof hole 13. It can be appreciated that, because the explosion-proof hole 13 communicates the inside and the outside of the energy storage device 1, when the air pressure inside the energy storage device 1 is too large, the explosion-proof valve 20 will rupture under the action of the air pressure, and the air inside the energy storage device 1 can be timely discharged to the outside of the energy storage device 1 through the explosion-proof hole 13, so as to avoid the explosion of the energy storage device 1 and improve the use reliability of the energy storage device 1.

In this embodiment, the pole 40, the plastic member 30 and the switching piece 50 are two. The two pole posts 40 are respectively penetrated through the two mounting holes 11 and are arranged at intervals with the top cover 10. One of the poles 40 is used as a positive pole and is electrically connected with a positive pole tab of the bare cell, and the other pole 40 is used as a negative pole and is electrically connected with a negative pole tab of the bare cell. Each plastic member 30 is fixedly connected between one pole 40 and the top cover 10. Each of the switching pieces 50 is mounted on a side of one of the plastic parts 30 facing away from the top cover 10, and abuts against one of the poles 40. In particular, this will be described below.

In this embodiment, both poles 40 may be made of copper, copper alloy material or copper-aluminum composite plate. Illustratively, the copper alloy material may be identified by the designation C110, C1020, C5191, KFC5, CAC16, or KLF194. The two poles 40 may be divided into a first pole 40a and a second pole 40b. The first pole 40a is disposed through the first mounting hole 11a. The first pole 40a includes a first cylindrical portion 41 and a first flange portion 42, and the first flange portion 42 is fixedly connected to one side of the first cylindrical portion 41. Specifically, the first cylindrical portion 41 is inserted into the first mounting hole 11a, and the first flange portion 42 is positioned inside the first escape groove 14 a. In addition, the outer surface of the first pole 40a facing the top cover 10 is provided with a microporous structure. Wherein the microporous structure is made in a weakly acidic microetching environment using T-treatment techniques.

The second post 40b is disposed through the second mounting hole 11b. The second post 40b includes a second post portion 43 and a second flange portion 44, and the second flange portion 44 is fixedly connected to one side of the second post portion 43. Specifically, the second cylindrical portion 43 is inserted into the second mounting hole 11b, and the second flange portion 44 is located inside the second escape groove 14 b. In addition, the second pole 40b is provided with a microporous structure toward the outer surface of the top cover 10. Wherein the microporous structure is made in a weakly acidic microetching environment using T-treatment techniques.

Referring to fig. 11, fig. 11 is a schematic view of the top cover 10, the explosion-proof valve 20, the pole 40 and the plastic member 30 shown in fig. 9 at another angle.

In this embodiment, the two plastic members 30 may be made of polyphenylene sulfide (Polyphenylene sulfide, PPS), PPT plastic material, nylon 6 (Polyamide 6, pa 6), nylon 66 (Polyamide) or Polyphthalamide (PPA), etc. When the plastic part 30 is manufactured by using the above material, in order to prevent the expansion and contraction speed of the plastic part 30 from being higher than that of metal, a fiber material such as glass fiber or carbon fiber is generally added to the above material so that the thermal expansion and contraction of the plastic part 30 is similar to that of metal. For example, both plastic pieces 30 may be formed by a nano-injection molding process.

The two plastic parts 30 are a first plastic part 30a and a second plastic part 30b, and the second plastic part 30b is arranged at intervals with the first plastic part 30 a. Illustratively, the first plastic part 30a and the second plastic part 30b are molded separately. In other embodiments, the first plastic part 30a and the second plastic part 30b may be integrally formed.

In this embodiment, at least part of the first plastic member 30a fills the micro-hole structure of the first pole 40a and the micro-hole structure of the top cover 10, so that the first plastic member 30a is fixed with the first pole 40a and the top cover 10. It can be understood that, during the nano injection molding process, the molten plastic solution can flow into the microporous structures of the first pole 40a and the top cover 10, and then the molten plastic solution is cooled to form the first plastic part 30a, so that the first plastic part 30a made of plastic material and the first pole 40a made of metal material and the top cover 10 can be fixed. In other words, the first plastic member 30a is fixedly connected between the peripheral surface of the first pole 40a and the top cover 10, and is disposed around the periphery of the opening of the injection hole 12. Specifically, the first plastic member 30a is fixedly connected between the peripheral surface of the first pole 40a and the hole wall of the first mounting hole 11 a.

The first plastic part 30a includes a first plastic body 39a, a first abutting portion 33 and a plurality of first protruding columns 34, wherein the plurality of first protruding columns 34 and the first abutting portion 33 are disposed on a side of the first plastic body 39a facing away from the top cover 10 and are spaced apart from each other. The first abutting portion 33 is disposed opposite to the first pole 40 a. The first abutment 33 includes a first dam 331 and a first abutment projection 332. The first barrier 331 is fixedly connected to a side of the first plastic member 30a facing away from the top cover 10, and is disposed opposite to and spaced apart from the first pole 40 a. The first abutting protrusion 332 is fixedly connected to a surface of the first barrier 331 facing the first pole 40a, and is spaced apart from the first pole 40 a. In the present embodiment, there may be a plurality of first abutment portions 33. The plurality of first contact portions 33 are provided at intervals along the longitudinal direction (X-axis direction in the drawing) of the first plastic member 30 a.

In addition, the first plastic body 39a includes a first main portion 31 and a first auxiliary portion 32, and the first auxiliary portion 32 is fixedly connected to the first main portion 31. Specifically, the first body portion 31 is located between the first pole 40a and the top cover 10, and is disposed around the peripheral surface of the first pole 40 a. The first auxiliary portion 32 is located on the surface of the top cover 10 facing the housing 110. That is, the first auxiliary portion 32 is located at the bottom surface of the top cover 10. Wherein the first auxiliary portion 32 is provided with a plurality of first studs 34.

In this embodiment, the second plastic part 30b at least partially fills the micro-hole structure of the second post 40b and the micro-hole structure of the top cover 10, so that the second plastic part 30b is fixed with the second post 40b and the top cover 10. It can be appreciated that during the nano injection molding process, the molten plastic solution can flow into the microporous structures of the second post 40b and the top cover 10, and then the molten plastic solution is cooled to form the second plastic part 30b, so that the second plastic part 30b made of plastic material, the second post 40b made of metal material and the top cover 10 can be fixed. In other words, the second plastic member 30b is fixedly connected between the second post 40b and the top cover 10, and is disposed around the periphery of the opening of the injection hole 12 and the periphery of the opening of the explosion-proof hole 13. Specifically, the second plastic member 30b is fixedly connected between the peripheral surface of the second post 40b and the hole wall of the second mounting hole 11 b.

The second plastic part 30b includes a second plastic body 39b, a second abutting portion 37 and a plurality of second protruding columns 38, wherein the second protruding columns 38 and the second abutting portion 37 are disposed on a side of the second plastic body 39b away from the top cover 10 and are spaced apart from each other. The second contact portion 37 is disposed opposite to the second post 40 b. The second abutment 37 includes a second stop bar 371 and a second abutment projection 372. The second barrier strip 371 is fixedly connected to a side of the second plastic part 30b facing away from the top cover 10, and is disposed opposite to and spaced apart from the second post 40 b. The second abutment protrusion 372 is fixedly connected to a surface of the second barrier strip 371 facing the second post 40b, and is spaced apart from the second post 40 b. In the present embodiment, there may be a plurality of second abutment portions 37. The plurality of second contact portions 37 are provided at intervals along the longitudinal direction (X-axis direction in the drawing) of the second plastic member 30 b.

In addition, the second plastic body 39b further includes a second main portion 35 and a second auxiliary portion 36, and the second auxiliary portion 36 is fixedly connected to the second main portion 35. The second auxiliary portion 36 may be integrally formed with the second body portion 35. The second body portion 35 is fixedly connected between the second post 40b and the top cover 10, and is disposed around the peripheral surface of the second post 40 b. The second auxiliary portion 36 is located on a surface of the top cover 10 facing the housing 110 and is spaced apart from the first auxiliary portion 32. That is, the second auxiliary portion 36 is located at the bottom surface of the top cover 10. Wherein the second auxiliary portion 36 is provided with a plurality of second studs 38.

Referring to fig. 11, 12 and 13 in combination, fig. 12 is a schematic structural view of the end cap assembly 120 shown in fig. 5 at another angle, and fig. 13 is a schematic structural view of the first tab 50a of the end cap assembly 120 shown in fig. 5.

In this embodiment, there are two switching pieces 50. Illustratively, both tabs 50 are generally "mountain" shaped. The two transfer tabs 50 are a first transfer tab 50a and a second transfer tab 50b, respectively. The first tab 50a is mounted on a side of the first plastic member 30a facing away from the top cover 10, and abuts against the first flange 42 of the first pole 40 a. The first tab 50a is detachably connected to the first pole 40 a.

The first switching piece 50a includes a first main body portion 51, a first switching portion 52, and a first bending portion 53, and the first switching portion 52 and the first bending portion 53 are fixedly connected to one side of the first main body portion 51. The first bending portion 53 is fixedly connected between the first main body portion 51 and the first transferring portion 52. The first body portion 51 is bendable with respect to the first joint portion 52 by the first bending portion 53.

In this embodiment, the first body 51 is electrically connected to the tab of the bare cell. The first body 51 may be electrically connected to the tab of the bare cell by soldering, for example. The first main body portion 51 is provided with a plurality of first fixing holes 54, escape notches 55, and two first concave portions 51a. Here, two first concave portions 51a are provided at intervals along the longitudinal direction (Y-axis direction in the drawing) of the first main body portion 51. The opening of each first concave portion 51a is located on the surface of the first main body portion 51 facing the first bending portion 53. Each of the first concave portions 51a is concave from the surface of the first main body portion 51 toward the first bending portion 53 toward the direction of the first main body portion 51. This arrangement facilitates bending of the first main body portion 51 relative to the first transfer portion 52 by the first bending portion 53, and also allows weight reduction of the first transfer piece 50 a.

The opening of the relief notch 55 is located on a surface of the first main body portion 51 facing away from the first bending portion 53. The escape notch 55 is recessed from the surface of the first main body 51 facing away from the first bending portion 53 in the direction of the first bending portion 53. The escape notch 55 is used to escape the pouring orifice 12 to prevent the first switching piece 50a from shielding the pouring orifice 12. The plurality of first fixing holes 54 penetrate the first body 51 along the thickness direction of the first body 51, are disposed at intervals from each other, and are disposed at intervals from the avoidance notches 55.

During the assembly process of the end cap assembly 120, the first transfer portion 52 is inserted between the first abutting portion 33 of the first plastic member 30a and the first flange portion 42 of the first pole 40a, and abuts against both the first pole 40a and the first abutting portion 33. Illustratively, the first transfer portion 52 is detachably interposed between the first abutment portion 33 and the first post 40 a. Wherein the first abutment protrusion 332 of the first abutment 33 abuts against the first transfer portion 52.

The first main body 51 is bent towards the first auxiliary portion 32 of the first plastic part 30a by the first bending portion 53 relative to the first connecting portion 52, and the plurality of first fixing holes 54 are arranged in a one-to-one correspondence with the plurality of first protruding columns 34, so that each first protruding column 34 can penetrate through one first fixing hole 54, and each first protruding column 34 is fixedly connected with the first main body 51. Wherein the first auxiliary portion 32 is located between the first main body portion 51 of the first tab 50a and the top cover 10, and the first auxiliary portion 32 completely covers the first main body portion 51 of the first tab 50 a. It will be appreciated that by having the first auxiliary portion 32 completely cover the first body portion 51, the risk of shorting of the first tab 50a to the top cover 10 may be further reduced.

It should be noted that, the first boss 34 may form a mushroom-head-shaped fixing structure by heat-melting, so that the first boss 34 and the first main body 51 are fixed, and the first adapting piece 50a can be tightly attached to the first plastic part 30 a.

With this arrangement, on the one hand, the first connection piece 50a is detachably connected with the first pole 40a, so that a laser welding process can be omitted, the production process flow of the energy storage device 1 can be simplified, and the problem that the energy storage device 1 leaks due to the fact that the plastic part 30 is melted due to the high temperature of the laser welding process can be avoided, so that the joint surface strength of the plastic part 30 and the top cover 10 can be enhanced. On the other hand, the first tab 50a is tightly attached to the first plastic member 30a, so that the dimension of the end cap assembly 120 in the thickness direction is reduced, so that the space of the energy storage device 1 in the height direction can be increased, and the energy density of the energy storage device 1 can be improved. Meanwhile, the first plastic piece 30a is formed between the first switching piece 50a and the top cover 10 in an injection molding mode, so that the risk of short circuit between the first switching piece 50a and the top cover 10 can be reduced, and the use reliability of the energy storage device 1 is ensured.

Referring to fig. 11, 12 and 14 in combination, fig. 14 is a schematic view of the structure of the second hinge plate 50b of the end cap assembly 120 shown in fig. 5.

The second switching piece 50b includes a second main body 56, a second switching portion 57 and a second bending portion 58, and the second switching portion 57 and the second bending portion 58 are fixedly connected to one side of the second main body 56. The second bending portion 58 is fixedly connected between the second main body portion 56 and the second adapting portion 57. The second body portion 56 is bendable relative to the second adapting portion 57 by the second bending portion 58.

In this embodiment, the second body 56 is electrically connected to the tab of the bare cell. The second body portion 56 may be electrically connected to the tab of the bare cell by soldering, for example. The second main body portion 56 is provided with a plurality of second fixing holes 59 and two second concave portions 56a. Here, two second concave portions 56a are provided at intervals along the longitudinal direction (Y-axis direction in the drawing) of the second body portion 56. The opening of each second concave portion 56a is located on the surface of the second main body portion 56 facing the second bending portion 58. Each of the second concave portions 56a is concave from the surface of the second main body portion 56 toward the second bending portion 58 toward the second main body portion 56. This arrangement facilitates bending of the second body portion 56 relative to the second adapter portion 57 by the second bending portion 58, and also allows weight reduction of the second adapter piece 50 b. The plurality of second fixing holes 59 are each penetrating along the second body portion 56 in the thickness direction of the second body portion 56, and are disposed at intervals from each other.

During the assembly process of the end cap assembly 120, the second adapting portion 57 is inserted between the second abutting portion 37 of the second plastic part 30b and the second flange portion 44 of the second post 40b, and abuts against both the second post 40b and the second abutting portion 37. Illustratively, the second adapter 57 is detachably interposed between the second abutment 37 and the second post 40 b. Wherein the second abutment protrusion 372 of the second abutment 37 abuts the second adapter 57.

The second main body 56 is bent towards the second auxiliary portion 36 of the second plastic part 30b by the second bending portion 58 relative to the second adapting portion 57, and the plurality of second fixing holes 59 are arranged in a one-to-one correspondence with the plurality of second protruding columns 38, so that each second protruding column 38 can be inserted into one second fixing hole 59, and each second protruding column 38 is fixedly connected with the second main body 56. Wherein the second auxiliary portion 36 is located between the second main body portion 56 of the second switching piece 50b and the top cover 10, and the second auxiliary portion 36 completely covers the second main body portion 56 of the second switching piece 50 b. It will be appreciated that by having the second auxiliary portion 36 completely cover the second body portion 56, the risk of shorting the second tab 50b to the top cover 10 may be further reduced.

It should be noted that, the second post 38 may form a mushroom-head-shaped fixing structure by heat-melting, so that the second post 38 and the second main body 56 are fixed, and the second adapting piece 50b can be tightly attached to the second plastic part 30 b.

With this arrangement, on the one hand, the second switching piece 50b is detachably connected with the second pole 40b, so that a laser welding process can be omitted, the production process flow of the energy storage device 1 can be simplified, and the problem that the energy storage device 1 leaks due to the fact that the plastic part 30 is melted due to the high temperature of the laser welding process can be avoided, so that the joint surface strength of the plastic part 30 and the top cover 10 can be enhanced. On the other hand, the second adapting piece 50b is tightly attached to the second plastic member 30b, so that the dimension of the end cover assembly 120 in the thickness direction is reduced, and thus the space of the energy storage device 1 in the height direction can be increased, which is helpful for increasing the energy density of the energy storage device 1. Meanwhile, the second plastic parts 30b are formed between the second switching piece 50b and the top cover 10 in an injection molding mode, so that the risk of short circuit between the second switching piece 50b and the top cover 10 can be reduced, and the use reliability of the energy storage device 1 is guaranteed.

In the technical scheme that this application provided, on the one hand, through set up the butt portion on plastic piece 30, make changeover portion 50 realize dismantling with utmost point post 40 and be connected, can save the laser welding process, both can simplify the production technology flow of energy memory 1, also can avoid plastic piece 30 because of receiving laser welding process's high temperature and melting to can strengthen the joint face intensity of plastic piece 30 and top cap 10, avoid energy memory 1 to appear the problem of weeping. On the other hand, the adaptor 50 is tightly attached to the side of the plastic part 30 facing away from the top cover 10, so that the dimension of the end cover assembly 120 in the thickness direction can be reduced, and the height space of the energy storage device 1 can be increased, thereby being beneficial to improving the energy density of the energy storage device 1. Meanwhile, the insulation piece 112 of the shell 110 is utilized to replace the Mylar film to isolate the bare cell from the main shell 111, insulation reliability between the bare cell and the shell 110 is guaranteed, and the plastic piece 30 does not need to be provided with a boss structure for welding the Mylar film, so that the size of the plastic piece 30 in the thickness direction can be reduced, the height space of the energy storage device 1 is increased, and further the energy density of the energy storage device 1 is also improved.

The application also provides electric equipment, and the electric equipment comprises the energy storage device 1, and the energy storage device 1 supplies power for the electric equipment. The electric equipment can be equipment needing electricity, such as a new energy automobile, a power storage station, a server and the like.

The foregoing description is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and should be covered in the scope of the present application; embodiments of the present application and features of embodiments may be combined with each other without conflict. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides an end cover subassembly for energy memory, its characterized in that, including top cap, utmost point post, plastic part and change piece, the top cap is equipped with the mounting hole, the mounting hole is followed the thickness direction of top cap runs through the top cap, the utmost point post wears to locate the mounting hole, the plastic part includes plastic body, butt portion and a plurality of projection, the part of plastic body fixedly connected with between utmost point post and the top cap, and encircle the global setting of utmost point post, another part of plastic body is located the bottom surface of top cap, butt portion locates the plastic body deviates from one side of top cap, and with the utmost point post deviates from the surface of top cap sets up relatively, butt portion includes blend stop and butt protruding, the blend stop fixedly connected with the plastic body deviates from one side of top cap, and with the looks interval and set up relatively of changeover portion, butt protruding fixed connection in the blend stop is towards the surface of changeover portion, and butt changeover portion; the convex columns are arranged on one side of the plastic body, which is away from the top cover, and are arranged at intervals; the switching piece is installed in the surface that the plastic part deviates from the top cap, the switching piece includes switching portion, main part and kink, switching portion inserts and locates between butt portion with the utmost point post, and with the utmost point post deviates from the surface of top cap with the butt portion all supports each other, main part fixed connection in one side of switching portion, main part is equipped with a plurality of fixed orificess, a plurality of the fixed orificess is followed the thickness direction of main part runs through main part, and each other interval sets up, kink fixed connection in main part with between the switching portion, main part accessible kink is relative the switching portion is crooked; each convex column penetrates through one fixing hole and is fixedly connected with the main body.

2. The end cap assembly of claim 1, wherein the surface of the pole facing the top cap, the surface of the top cap facing the pole, and the top and bottom surfaces of the top cap are each provided with a microporous structure, and wherein the plastic piece at least partially fills the microporous structure.

3. The end cap assembly of claim 1, wherein the plastic body comprises a main portion and an auxiliary portion, the auxiliary portion is fixedly connected to the main portion, the main portion is located between the pole and the top cap and is disposed around the circumference of the pole, the auxiliary portion is located between the adapter piece and the top cap, and the auxiliary portion completely covers the adapter piece.

4. An energy storage device comprising a housing provided with an opening and an end cap assembly as claimed in any one of claims 1 to 3 mounted to the housing and closing the opening.

5. The energy storage device of claim 4, further comprising a bare cell mounted inside the housing;

the shell comprises a main shell body and an insulating piece, wherein the main shell body accommodates the bare cell and the insulating piece, and the insulating piece protrudes relative to the inner surface of the main shell body and is positioned between the main shell body and the bare cell.

6. The energy storage device of claim 5, wherein said insulator is integrally formed with said main housing.

7. The energy storage device of claim 6, wherein an inner surface of the main housing is provided with a microporous structure, and wherein at least a portion of the insulating member fills the microporous structure.

8. The energy storage device of claim 7, wherein said main housing comprises a bottom plate and a side housing fixedly attached to one side of said bottom plate;

the insulating piece comprises a plurality of first sub-insulating parts, a plurality of second sub-insulating parts, a plurality of third sub-insulating parts and a plurality of fourth sub-insulating parts, wherein the first sub-insulating parts and the second sub-insulating parts are arranged on the inner surface of the bottom plate, the first sub-insulating parts are sequentially arranged at intervals along the length direction of the main shell, and the second sub-insulating parts are sequentially arranged at intervals along the width direction of the main shell and are intersected with the first sub-insulating parts;

the plurality of third sub-insulating parts and the plurality of fourth sub-insulating parts are all arranged on the inner surface of the side shell, the plurality of third sub-insulating parts are sequentially arranged at intervals in the height direction of the side shell, each third sub-insulating part is arranged around the circumference of the side shell, the plurality of fourth sub-insulating parts are sequentially arranged around the circumference of the side shell at intervals, and the third sub-insulating parts are intersected.

9. The energy storage device of claim 8, wherein each of the third sub-insulators includes a first face, a second face, and a first chamfered face, the first face being a surface of the third sub-insulator facing toward the opening, the second face being a surface of the third sub-insulator facing away from an inner surface of the side shell, the first chamfered face being connected between the second face and the first face;

each fourth sub-insulation part comprises a third face, a fourth face and a second chamfer face, the third face is the surface of the fourth sub-insulation part facing the opening and parallel to the first face, the fourth face is the surface of the fourth sub-insulation part deviating from the inner surface of the side shell, the fourth face is coplanar with the second face and is intersected with the second face, and the second chamfer face is connected between the fourth face and the third face.

10. The energy storage device of claim 8, wherein each of the first sub-insulation portions is provided with a first notch extending through the first sub-insulation portion along a length of the main housing;

each third sub-insulating part is provided with a second notch, and the second notch penetrates through the third sub-insulating part along the height direction of the main shell.

11. A powered device comprising an energy storage device as claimed in any one of claims 4 to 10, the energy storage device powering the powered device.