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

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 components, energy storage devices and electrical equipment

Technical field

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

Background technique

Secondary battery (Rechargeable battery), also known as rechargeable battery or storage battery, refers to a battery that can be activated by charging to continue to use the active material after the battery is discharged. The recyclability characteristics of secondary batteries have gradually made them the main source of power for electrical equipment. As the demand for secondary batteries gradually increases, people have higher and higher performance requirements in all aspects, especially for batteries. Requirements for energy density per unit volume. In existing batteries, the adapter piece and the pole usually need to be connected by laser welding, which can easily cause the lower plastic to melt at the welding temperature, reducing the strength of the joint surface between the lower plastic and the top cover, causing battery leakage.

Contents of the invention

This application provides an end cover assembly, an energy storage device and an electrical device that can detachably connect the adapter piece and the pole, thereby eliminating the need for laser welding procedures and thus helping to avoid leakage of the energy storage device. question.

In a first aspect, the present application provides an end cover assembly for use in an energy storage device. The end cover assembly includes a top cover, a pole, a plastic part and an adapter piece. The top cover is provided with a mounting hole, and the mounting hole penetrates the top cover along the thickness direction of the top cover. The pole passes through In the mounting hole, the plastic part includes a plastic body, a contact portion and a plurality of protrusions. Part of the plastic body is fixedly connected between the pole and the top cover and surrounds the pole. The other part of the plastic body is located on the bottom surface of the top cover, and the contact portion is provided on the side of the plastic body away from the top cover, and is away from the pole and the top cover. The surfaces of the cover are arranged oppositely, and the contact portion includes a blocking bar and a contacting protrusion. The blocking bar is fixedly connected to the side of the plastic part away from the top cover, and is spaced apart from and opposite to the adapter portion. It is provided that the contact protrusion is fixedly connected to the surface of the retaining bar facing the transfer part and contacts the transfer part, and a plurality of the protrusions are provided on the plastic part away from the top. the surface of the cover, and are spaced apart from each other; the adapter piece is installed on the surface of the plastic part facing away from the top cover, the adapter piece includes an adapter part, a main part and a bending part, the adapter part It is inserted between the contact portion and the pole, and the surface of the pole away from the top cover and the contact portion are in contact with each other, and the main body portion is fixedly connected to the pivot. On one side of the connecting portion, the main body is provided with a plurality of fixing holes. The plurality of fixing holes penetrate the main body along the thickness direction of the main body and are spaced apart from each other. The bent portion is fixedly connected to Between the main body part and the adapter part, the main body part can be bent relative to the adapter part through the bending part; each of the protrusions is passed through one of the fixing holes, and is connected with The main body part is fixedly connected.

Wherein, the surface of the pole facing the top cover, the surface of the top cover facing the pole, and the top and bottom surfaces of the top cover are all provided with microporous structures, and at least part of the plastic part is filled with The microporous structure.

Wherein, the plastic body includes a main part and an auxiliary part. The auxiliary part is fixedly connected to the main part. The main part is located between the pole and the top cover and surrounds the circumference of the pole. The auxiliary part is located between the adapter piece and the top cover, and the auxiliary part completely covers the adapter piece.

In a second aspect, the application provides an energy storage device, including a shell and any one of the above end cap assemblies. The shell is provided with an opening. The end cap assembly is installed on the shell and closes the opening. .

Wherein, the energy storage device further includes a bare battery core, and the bare battery core is installed inside the housing; the housing includes a main housing and an insulator, and the main housing accommodates the bare battery core. and the insulating member, which protrudes relative to the inner surface of the main housing and is located between the main housing and the bare battery core.

Wherein, the insulating member is integrally formed with the main housing.

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

Wherein, the main housing includes a bottom plate and a side shell, and the side shell is fixedly connected to one side of the bottom plate; the insulator includes a plurality of first sub-insulation parts, a plurality of second sub-insulation parts, a plurality of A third sub-insulation part and a plurality of fourth sub-insulation parts, a plurality of first sub-insulation parts and a plurality of second sub-insulation parts are provided on the inner surface of the bottom plate, and a plurality of the first sub-insulation parts The plurality of second sub-insulating parts are arranged at intervals along the length direction of the main housing, and the plurality of second sub-insulating parts are arranged at intervals along the width direction of the main housing and intersect with the plurality of first sub-insulating parts. ; A plurality of the third sub-insulation parts and a plurality of the fourth sub-insulation parts are provided on the inner surface of the side shell, and the plurality of third sub-insulation parts are arranged in sequence along the height direction of the side shell. Arranged at intervals, each of the third sub-insulating parts is arranged around the circumference of the side shell, and a plurality of the fourth sub-insulating parts are arranged at intervals around the circumference of the side shell, and are connected with a plurality of The third sub-insulating parts are arranged to intersect.

Wherein, each third sub-insulating part includes a first surface, a second surface and a first chamfered surface, the first surface is a surface of the third sub-insulating part facing the opening, and the third sub-insulating part The two surfaces are the surfaces of the third sub-insulating part facing away from the inner surface of the side shell, and the first chamfered surface is connected between the second surface and the first surface; each of the fourth Each sub-insulation part includes a third surface, a fourth surface and a second chamfered surface. The third surface is a surface of the fourth sub-insulation part facing the opening and is parallel to the first surface. The fourth surface The surface is the surface of the fourth sub-insulating part facing away from the inner surface of the side shell. The fourth surface is coplanar with the second surface and intersects with the second surface. The second chamfered surface is connected to Between the fourth side and the third side.

Wherein, each first sub-insulation part is provided with a first notch, and the first notches penetrate the first sub-insulation part along the length direction of the main housing; each of the third sub-insulation parts Each insulating part is provided with a second notch, and the second notch penetrates the third sub-insulating part along the height direction of the main housing.

In a third aspect, the present application also provides electrical equipment, including the above-mentioned energy storage device, and the energy storage device supplies power to the electrical equipment.

In the technical solution provided by this application, on the one hand, by providing abutting parts on the plastic parts, the adapter piece and the pole are detachably connected, which can save the laser welding process and simplify the production process of the energy storage device. The process can also prevent plastic parts from melting due to the high temperature of the laser welding process, thereby enhancing the strength of the joint surface between the plastic parts and the top cover and avoiding leakage problems in the energy storage device. On the other hand, the adapter piece is closely attached to the side of the plastic part away from the top cover, which can reduce the size of the end cover assembly in the thickness direction, thereby increasing the height space of the energy storage device, thereby helping to improve energy storage. The energy density of the device. At the same time, the insulating parts of the casing are used instead of Mylar sheets to isolate the bare cells from the main casing, ensuring the reliability of the insulation between the bare cells and the casing, so that the plastic parts do not need to be equipped with bosses for welding the Mylar sheets. structure, thereby reducing the size of the plastic part in the thickness direction and increasing the height space of the energy storage device, which in turn helps to increase the energy density of the energy storage device.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the drawings required for the embodiments of the present application will be described below.

Figure 1 is a schematic structural diagram of a household energy storage system according to an embodiment of the present application;

Figure 2 is a schematic structural diagram of the energy storage device in the household energy storage system shown in Figure 1;

Figure 3 is a schematic structural diagram of the housing in the energy storage device shown in Figure 2;

Figure 4 is an enlarged schematic diagram of area C in Figure 3;

Figure 5 is a schematic structural diagram of the end cover assembly in the energy storage device shown in Figure 2;

Figure 6 is an exploded structural schematic view of the end cap assembly shown in Figure 5;

Figure 7 is a schematic cross-sectional structural view of the end cap assembly shown in Figure 5, cut along A-A;

Figure 8 is a schematic structural diagram of the top cover in the end cover assembly shown in Figure 5;

Figure 9 is a schematic cross-sectional structural view of the top cover shown in Figure 8 after being cut along B-B;

Figure 10 is a schematic structural diagram of the top cover, explosion-proof valve, pole and plastic parts in the end cover assembly shown in Figure 5;

Figure 11 is a schematic structural diagram of the top cover, explosion-proof valve, pole and plastic parts shown in Figure 9 from another angle;

Figure 12 is a schematic structural view of the end cover assembly shown in Figure 5 from another angle;

Figure 13 is a schematic structural diagram of the first adapter piece in the end cover assembly shown in Figure 5;

FIG. 14 is a schematic structural diagram of the second adapter piece in the end cover assembly shown in FIG. 5 .

The names corresponding to each reference mark in the figure are:

Energy storage device 1, power conversion device 2, first user load 3, second user load 4, housing 110, end cover assembly 120, opening 110a, receiving cavity 110b, main housing 111, insulator 112, bottom plate 111a, Side shell 111b, first sub-insulating part 113, second sub-insulating part 114, third sub-insulating part 115, fourth sub-insulating part 116, first surface 115b, second surface 115c, first chamfered surface 115d, Three sides 116a, fourth side 116b, second chamfered surface 116c, first notch 113a, second notch 115a, top cover 10, explosion-proof valve 20, plastic part 30, pole 40, adapter piece 50, mounting hole 11 , liquid injection hole 12, explosion-proof hole 13, escape groove 14, first mounting hole 11a, second mounting hole 11b, first escape groove 14a, second escape groove 14b, first pole 40a, second pole 40b, The first cylinder part 41, the first flange part 42, the second cylinder part 43, the second flange part 44, the first plastic part 30a, the second plastic part 30b, the first plastic body 39a, the first contact part 33, the first protruding post 34, the first blocking bar 331, the first contact protrusion 332, the first main body part 31, the first auxiliary part 32, the second plastic body 39b, the second contact part 37, the second The boss 38, the second blocking bar 371, the second contact protrusion 372, the second main body part 35, the second auxiliary part 36, the first adapter piece 50a, the second adapter piece 50b, the first main body part 51, The first adapter part 52, the first bending part 53, the first fixing hole 54, the avoidance notch 55, the first recessed part 51a, the second main part 56, the second adapter part 57, the second bending part 58, Second fixing hole 59, second recessed portion 56a.

Detailed ways

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

Since the energy that people need has strong temporal and spatial characteristics, in order to rationally utilize energy and improve energy utilization, it is necessary to use a medium or device to use the same form of energy or convert it into another form. Energy forms are stored and released in specific energy forms based on future application needs. At present, the main way to generate green electricity is to develop photovoltaic, wind power and other green energy sources to replace fossil energy.

At present, the generation of green electric energy generally relies on photovoltaic, wind power, hydropower, etc. However, wind energy and solar energy generally have problems of high intermittent and large fluctuations, which will cause unstable power grids, insufficient power during peak power consumption, and too much power during low power consumption. , Unstable voltage will also cause damage to electricity, so it may be due to insufficient power demand or insufficient power grid acceptance capacity, causing the problem of "abandoning wind and light". To solve these problems, energy storage must be relied on. That is, electrical energy is converted into other forms of energy through physical or chemical means and stored, and the energy is converted into electrical energy and released when needed. To put it simply, energy storage is like a large "power bank". When photovoltaic and wind energy are sufficient, , stores electrical energy and releases the stored electricity when needed.

Taking electrochemical energy storage as an example, this solution provides an energy storage device 1. The energy storage device 1 is equipped with a set of chemical batteries. It mainly uses chemical elements in the battery as the energy storage medium. The charging and discharging process is accompanied by the change of the energy storage medium. Chemical reactions or changes simply put the electricity generated by wind and solar energy into chemical batteries, and then release the stored electricity for use when the use of external electricity reaches its peak, or transfer it to places where electricity is in short supply for reuse.

The current energy storage (i.e., energy storage) application scenarios are relatively wide, including power generation side energy storage, grid side energy storage, and power consumption side energy storage. The corresponding types of energy storage devices 1 include:

(1) Large-scale energy storage power stations applied to wind power and photovoltaic power stations can help renewable energy power generation meet grid connection requirements while improving the utilization rate of renewable energy; energy storage power stations serve as high-quality active/reactive power regulation on the power supply side. Power supply, realize load matching of electric energy in time and space, enhance renewable energy consumption capacity, reduce instantaneous power changes, reduce the impact on the power grid, improve new energy generation and accommodation issues and provide backup in the power grid system, alleviating peak load power supply pressure It is of great significance in terms of peak and frequency modulation;

(2) The energy storage container used on the grid side mainly functions as peak shaving, frequency modulation, and alleviation of grid congestion. In terms of peak shaving, it can achieve peak shaving and valley filling of the electricity load, that is, the energy storage battery can be used when the electricity load is low. Charging releases stored electricity during peak hours of electricity load, thereby achieving a balance between electricity production and consumption;

(3) Small energy storage cabinets are used on the power side. Their main functions are self-use of power, peak and valley price difference arbitrage, capacity cost management, and improving power supply reliability. According to different application scenarios, power-side energy storage can be divided into industrial and commercial energy storage cabinets, household energy storage devices, energy storage charging piles, etc., which are generally used in conjunction with distributed photovoltaics. Industrial and commercial users can use energy storage for valley-peak price difference arbitrage and capacity cost management. In the electricity market that implements peak and valley electricity prices, 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, thereby realizing arbitrage of the peak and valley electricity price difference and reducing electricity costs. In addition, industrial enterprises that are subject to the two-part electricity price can use energy storage systems to store energy during low power consumption periods and discharge during peak load periods, thereby reducing peak power and declared maximum demand, thereby achieving the purpose of reducing capacity electricity charges. Household photovoltaic distribution and storage can improve the level of self-consumption of electricity. Due to high electricity prices and poor power supply stability, the demand for household photovoltaic installations has been boosted. Considering that photovoltaics generate electricity during the day, and users generally have higher loads at night, configuring energy storage can make better use of photovoltaic power, improve self-consumption levels, and reduce electricity costs. In addition, communication base stations, data centers and other fields need to configure energy storage for backup power.

Please refer to Figure 1, which is a schematic structural diagram of a household energy storage system according to an embodiment of the present application.

The embodiment in Figure 1 of this application takes the household energy storage scenario in user-side energy storage as an example for explanation. It should be noted that the energy storage device 1 of this application is not limited to household energy storage scenarios. This application provides a household energy storage system, which includes a power conversion device 2 (photovoltaic panel), a first user load 3 (street lights), a second user load 4 (such as air conditioners and other household appliances), etc., and Energy storage device 1. The energy storage device 1 is a small energy storage box, which can be installed on an outdoor wall by wall-mounting. Specifically, photovoltaic panels can convert solar energy into electrical energy during low electricity prices. The energy storage device 1 is used to store this electrical energy and supply it to street lights and household appliances for use during peak electricity prices, or provide power when the power grid is outage/outage. .

The number of energy storage devices 1 can be multiple. Multiple energy storage devices 1 are connected in series or in parallel. Multiple energy storage devices 1 are supported and electrically connected using isolation plates (not shown). In this embodiment, "plurality" refers to two or more than two. An energy storage box may also be provided outside the energy storage device 1 for accommodating the energy storage device 1 .

Optionally, the energy storage device 1 may include but is not limited to single cells, battery modules, battery packs, battery systems, etc. The actual application form of the energy storage device 1 provided by the embodiment of the present application can be, but is not limited to, the listed products, and can also be other application forms. The embodiment of the present application does not strictly limit the application form of the energy storage device 1 . The embodiment of this application is only explained by taking the energy storage device 1 as a multi-cell 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.

Please refer to Figures 2 and 3. Figure 2 is a schematic structural diagram of the energy storage device 1 in the household energy storage system shown in Figure 1. Figure 3 is a schematic structural diagram of the housing 110 of the energy storage device 1 shown in Figure 2.

Among them, for the 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 the Y-axis direction, and the height direction of the energy storage device 1 is defined as the Z-axis direction. The X-axis direction and 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 cover assembly 120 . The housing 110 has an opening 110a and a receiving cavity 110b, and the opening 110a communicates with the receiving cavity 110b. The receiving cavity 110b can be used to receive bare cells and electrolyte. The bare battery core is received in the receiving cavity 110b and soaked in the electrolyte. The end cover assembly 120 is installed on one side of the housing 110 in the height direction of the energy storage device 1 (the Z-axis direction in the figure), and closes the opening. By way of example, the energy storage device 1 is a square battery. In some other embodiments, the energy storage device 1 may also be a cylindrical battery or other battery.

Please refer to Figure 3 and Figure 4 in conjunction. Figure 4 is an enlarged schematic diagram of area C in Figure 3.

The housing 110 includes a main housing 111 and an insulating member 112 . The insulating member 112 is located inside the main housing 111 and protrudes toward the inside of the main housing 111 relative to the inner surface of the main housing 111 . In this embodiment, the insulating member 112 and the main housing 111 are integrally formed. Exemplarily, the insulating member 112 is formed through a nano injection molding (Nano Molding Technology, NMT) process. Specifically, the inner surface of the main housing 111 is provided with a microporous structure, and at least part of the insulating member 112 is filled with the microporous structure, so that the insulating member 112 is fixedly connected to the main housing 111 .

It should be noted that the microporous structure is made using T processing technology in a weakly acidic micro-corrosive environment. Among them, T treatment technology is a pre-treatment technology for nano injection molding process. Nano-scale pits, that is, a microporous structure, can be formed on the inner surface of the main housing 111 through T processing technology. During the nano-injection molding process, the molten plastic liquid can flow into the microporous structure of the main housing 111, and then the molten plastic liquid is cooled to form the insulating member 112, so that the insulating member 112 made of plastic material and the metal material are separated. The completed main housing 111 can be fixed.

In this embodiment, by arranging the insulating member 112 inside the main case 111 and using the insulating member 112 to isolate the bare battery core from the main case 111, there is no need to install additional Mylar sheets in the energy storage device 1, and the bare battery can be ensured. The insulation reliability between the battery core and the casing 110 can eliminate the process of installing and welding Mylar sheets, which is beneficial to simplifying the production process of the energy storage device 1 . At the same time, the insulating member 112 and the main housing 111 are integrally formed, which is also beneficial to increasing the internal space of the housing 110 .

In this embodiment, the main housing 111 includes a bottom plate 111a and a side shell 111b. The side shell 111b is fixedly connected to one side of the bottom plate 111a. The side shell 111b and the bottom plate 111a together form a receiving cavity 110b. The insulating member 112 includes a plurality of first sub-insulating parts 113 , a plurality of second sub-insulating parts 114 , a plurality of third sub-insulating parts 115 and a plurality of fourth sub-insulating parts 116 . Among them, the first sub-insulating part 113 and the plurality of second sub-insulating parts 114 are provided on the inner surface of the bottom plate 111a. The plurality of first sub-insulating portions 113 are arranged at intervals along the length direction of the main housing 111 (the X-axis direction in the figure). The plurality of second sub-insulating portions 114 are arranged at intervals along the width direction of the main housing 111 (the Y-axis direction in the figure) and intersect with 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 shell 111b. The plurality of third sub-insulating portions 115 are sequentially arranged at intervals along the height direction of the side shell 111b (the Z-axis direction in the figure). Each third sub-insulating part 115 is arranged around the circumference of the side shell 111b. Each third sub-insulating part 115 includes a first surface 115b, a second surface 115c and a first chamfered surface 115d. The first chamfered surface 115d is connected between the first surface 115b and the second surface 115c. Among them, the first surface 115b is the surface of the third sub-insulating part 115 facing the opening 110a of the housing 110. The second surface 115c is the surface of the third sub-insulating portion 115 that is away from the inner surface of the side shell 111b and protrudes relative to the inner surface of the side shell 111b. For example, the second surface 115c is parallel to the inner surface of the side shell 111b.

The plurality of fourth sub-insulating parts 116 are arranged at intervals around the circumferential direction of the side shell 111b and intersect with the plurality of third sub-insulating parts 115 . Each fourth sub-insulating part 116 includes a third surface 116a, a fourth surface 116b and a second chamfered surface 116c. The second chamfered surface 116c is connected between the third surface 116a and the fourth surface 116b. The third surface 116a is disposed toward the opening 110a of the housing 110 and is parallel to the first surface 115b. The fourth surface 116b is the surface of the fourth sub-insulating portion 116 that is away from the inner surface of the side shell 111b and protrudes relative to the inner surface of the side shell 111b. For example, the fourth surface 116b is parallel to the inner surface of the side shell 111b. The fourth surface 116b is coplanar with the second surface 115c and intersects with the second surface 115c.

It can be understood that by providing the first chamfer surface 115d between the first surface 115b and the second surface 115c, and 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 all smoothed to prevent the bare cells from being scratched by the insulating member 112 during the process of being installed in the case 110. damage, thereby ensuring the reliability of the bare battery core.

In addition, each first sub-insulating part 113 is provided with a first notch 113a. The first notches 113 a all penetrate the first sub-insulating part 113 along the length direction of the main housing 111 (the X-axis direction in the figure). Each third sub-insulating part 115 may be provided with a second notch 115a. The second notches 115 a all penetrate the third sub-insulating part 115 along the height direction of the main housing 111 (the Z-axis direction in the figure).

Under this setting, during the process of injecting electrolyte into the energy storage device 1, the first gap 113a and the second gap 115a can be used to drain the electrolyte, so that the electrolyte can evenly infiltrate the bare cell from all sides, thereby improving the electrolysis The efficiency and infiltration uniformity of the liquid-infiltrated bare cells are beneficial to extending the service life of the energy storage device 1 .

Please refer to Figures 5 to 7. Figure 5 is a schematic structural view of the end cover assembly 120 in the energy storage device 1 shown in Figure 2. Figure 6 is an exploded structural schematic view of the end cover assembly 120 shown in Figure 5. Figure 7 is a schematic view of the end cover assembly 120 shown in Figure 5. A schematic cross-sectional structural diagram of the end cap assembly 120 taken along A-A is shown. Among them, "cutting along A-A" means cutting along the plane where line A-A is located, and similar descriptions in the following can be understood in the same way.

The end cover assembly 120 includes a top cover 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 pole 40 are both installed on the top cover. The plastic part 30 is located between the pole 40 and the top cover 10 , 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 . For example, the pole 40 and the top cover 10 can be integrally formed through a nano-injection molding process. The plastic part 30 can not only ensure the assembly stability between the pole 40 and the top cover 10 , but also prevent the pole 40 and the top cover 10 from being in direct contact with each other to achieve insulation between the pole 40 and the top cover 10 . The adapter piece 50 is installed on the surface of the plastic part 30 facing away from the top cover 10 and is detachably connected to the pole post 40 .

Please refer to FIGS. 8 and 9 . FIG. 8 is a schematic structural diagram of the top cover 10 in the end cover assembly 120 shown in FIG. 5 . FIG. 9 is a schematic cross-sectional structural diagram of the top cover 10 shown in FIG. 8 along B-B.

In this embodiment, the top cover 10 can be made of aluminum or aluminum alloy material. For example, the top cover may be made of aluminum alloy from 1000 series to 7000 series. The surface of the top cover 10 facing the pole 40 and the top and bottom surfaces of the top cover 10 are provided with microporous structures. Among them, the microporous structure is made using T processing technology in a weakly acidic and micro-corrosive environment.

The top cover 10 is also provided with a mounting hole 11, a liquid injection hole 12, an explosion-proof hole 13 and an escape groove 14. Among them, 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 spaced apart from each other, and communicate with the inside and outside of the energy storage device 1 . The electrolyte can be injected into the receiving cavity of the housing 110 through the injection hole 12 to realize the perfusion of the electrolyte into the energy storage device 1 . For example, the explosion-proof hole 13 is an oval hole, and the liquid injection hole 12 is a circular hole. In some other embodiments, the explosion-proof hole 13 can also be a circular hole, a square hole or other special-shaped holes, and/or the liquid injection hole 12 can be a square hole or other special-shaped holes.

In this embodiment, there are two mounting holes 11 , and the two mounting holes 11 are spaced apart from each other. The two mounting holes 11 are divided into a first mounting hole 11a and a second mounting hole 11b. Along the length direction of the top cover 10 (X-axis direction in the figure), the first mounting hole 11a is located between the liquid injection hole 12 and the explosion-proof hole 13. On one side, the second mounting hole 11b is located on the side of the explosion-proof hole 13 away from the liquid injection hole 12 .

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

Please also refer to FIG. 10 , which is a schematic structural diagram of the top cover 10 , the explosion-proof valve 20 , the pole 40 and the plastic part 30 in the end cover assembly shown in FIG. 5 .

The explosion-proof valve 20 is installed on the explosion-proof hole 13 and is fixedly connected to the hole wall of the explosion-proof hole 13 . For example, the explosion-proof valve 20 is fixedly connected to the hole wall of the explosion-proof hole 13 by welding so as to be installed in the explosion-proof hole 13 . It can be understood that since the explosion-proof hole 13 connects the inside and outside of the energy storage device 1, when the air pressure inside the energy storage device 1 is too high, the explosion-proof valve 20 will rupture under the action of the air pressure, and the gas inside the energy storage device 1 will burst. It can be discharged to the outside of the energy storage device 1 through the explosion-proof hole 13 in time, thereby preventing the energy storage device 1 from exploding and improving the reliability of the energy storage device 1 .

In this embodiment, there are two poles 40 , two plastic parts 30 and two adapter pieces 50 . The two poles 40 are respectively penetrated through the two installation holes 11 and are spaced apart from the top cover 10 . Among them, one pole 40 serves as a positive pole and is electrically connected to the positive tab of the bare cell. The other pole 40 serves as a negative pole and is electrically connected to the negative tab of the bare cell. Each plastic part 30 is fixedly connected between a pole 40 and the top cover 10 . Each adapter piece 50 is installed on the side of a plastic part 30 facing away from the top cover 10 , and is in contact with a pole 40 . Details will be explained below.

In this embodiment, both poles 40 can be made of copper, copper alloy materials or copper-aluminum composite plates. For example, the grade of copper alloy material can be C110, C1020, C5191, KFC5, CAC16 or KLF194. The two poles 40 can be divided into a first pole 40a and a second pole 40b. Among them, the first pole 40a is passed through the first mounting hole 11a. The first pole 40a includes a first column part 41 and a first flange part 42. The first flange part 42 is fixedly connected to one side of the first column part 41. Specifically, the first column part 41 penetrates the first mounting hole 11a, and the first flange part 42 is located inside the first escape groove 14a. In addition, the outer surface of the first pole 40a facing the top cover 10 is provided with a microporous structure. Among them, the microporous structure is made using T processing technology in a weakly acidic and micro-corrosive environment.

The second pole 40b is inserted through the second mounting hole 11b. The second pole 40b includes a second column part 43 and a second flange part 44. The second flange part 44 is fixedly connected to one side of the second column part 43. Specifically, the second column part 43 penetrates the second mounting hole 11b, and the second flange part 44 is located inside the second escape groove 14b. In addition, the outer surface of the second pole 40b facing the top cover 10 is provided with a microporous structure. Among them, the microporous structure is made using T processing technology in a weakly acidic and micro-corrosive environment.

Please also refer to FIG. 11 , which is a schematic structural diagram of the top cover 10 , the explosion-proof valve 20 , the pole 40 and the plastic part 30 shown in FIG. 9 from another angle.

In this embodiment, both plastic parts 30 can be made of polyphenylene sulfide (PPS), PPT plastic material, nylon 6 (Polyamide 6, PA6), nylon 66 (Polyadiohexylenediamine) or polyphthalamide ( Polyphthalamide (PPA), etc. It should be noted that when the above-mentioned materials are used to prepare the plastic part 30, in order to prevent the plastic part 30 from expanding and shrinking faster than the metal, fiber materials such as glass fiber or carbon fiber are usually added to the above-mentioned materials to reduce the thermal expansion and contraction of the plastic part 30. Similar to metal. For example, both plastic parts 30 can be formed through a nano-injection molding process.

The two plastic parts 30 are respectively a first plastic part 30a and a second plastic part 30b. The second plastic part 30b is spaced apart from the first plastic part 30a. For example, the first plastic part 30a and the second plastic part 30b are formed separately. In some other embodiments, the first plastic part 30a and the second plastic part 30b can also be integrally formed.

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

The first plastic part 30a includes a first plastic body 39a, a first contact portion 33 and a plurality of first protrusions 34. The plurality of first protrusions 34 and the first contact portions 33 are located away from the first plastic body 39a. One side of the top cover 10 and are spaced apart from each other. Among them, the first contact portion 33 is arranged opposite to the first pole 40a. The first contact portion 33 includes a first blocking bar 331 and a first contact protrusion 332 . Among them, the first blocking bar 331 is fixedly connected to the side of the first plastic part 30a facing away from the top cover 10, and is spaced apart from and opposite to the first pole 40a. The first contact protrusion 332 is fixedly connected to the surface of the first retaining bar 331 facing the first pole 40a, and is spaced apart from the first pole 40a. In this embodiment, there may be multiple first contact parts 33 . Along the length direction of the first plastic part 30a (the X-axis direction in the figure), a plurality of first contact portions 33 are arranged at intervals.

In addition, the first plastic body 39a includes a first main body part 31 and a first auxiliary part 32, and the first auxiliary part 32 is fixedly connected to the first main body part 31. Specifically, the first main body part 31 is located between the first pole 40a and the top cover 10, and is arranged around the circumference of the first pole 40a. 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 on the bottom surface of the top cover 10 . The first auxiliary part 32 is provided with a plurality of first protrusions 34 .

In this embodiment, at least part of the second plastic part 30b is filled with the microporous structure of the second pole 40b and the microporous structure of the top cover 10, so that the second plastic part 30b, the second pole 40b and the top cover 10 realize fixed. It can be understood that during the nano-injection molding process, the molten plastic liquid can flow into the microporous structure of the second pole 40b and the top cover 10, and then the molten plastic liquid is cooled to form the second plastic part 30b, so that The second plastic part 30b made of plastic material can be fixed to the second pole 40b made of metal material and the top cover 10. In other words, the second plastic part 30 b is fixedly connected between the second pole 40 b and the top cover 10 , and is arranged around the opening of the liquid injection hole 12 and the opening of the explosion-proof hole 13 . Specifically, the second plastic part 30b is fixedly connected between the peripheral surface of the second pole 40b and the hole wall of the second mounting hole 11b.

The second plastic part 30b includes a second plastic body 39b, a second contact portion 37 and a plurality of second protrusions 38. The plurality of second protrusions 38 and the second contact portions 37 are located away from the second plastic body 39b. One side of the top cover 10 and are spaced apart from each other. Among them, the second contact portion 37 is arranged opposite to the second pole 40b. The second contact portion 37 includes a second retaining bar 371 and a second contact protrusion 372 . Among them, the second retaining bar 371 is fixedly connected to the side of the second plastic part 30b away from the top cover 10, and is spaced apart from and opposite to the second pole 40b. The second contact protrusion 372 is fixedly connected to the surface of the second retaining bar 371 facing the second pole 40b, and is spaced apart from the second pole 40b. In this embodiment, there may be multiple second contact parts 37 . Along the length direction of the second plastic part 30b (the X-axis direction in the figure), a plurality of second contact portions 37 are arranged at intervals.

In addition, the second plastic body 39b also includes a second main body part 35 and a second auxiliary part 36. The second auxiliary part 36 is fixedly connected to the second main body part 35. The second auxiliary part 36 and the second main part 35 may be integrally formed. The second main body part 35 is fixedly connected between the second pole 40b and the top cover 10, and is arranged around the circumference of the second pole 40b. The second auxiliary part 36 is located on the surface of the top cover 10 facing the housing 110 and is spaced apart from the first auxiliary part 32 . That is, the second auxiliary portion 36 is located on the bottom surface of the top cover 10 . The second auxiliary part 36 is provided with a plurality of second protrusions 38 .

Please refer to Figures 11, 12 and 13 in conjunction. Figure 12 is a schematic structural view of the end cover assembly 120 shown in Figure 5 from another angle. Figure 13 is a first adapter piece 50a in the end cover assembly 120 shown in Figure 5. Structural diagram.

In this embodiment, there are two adapter pieces 50 . For example, both adapter pieces 50 are roughly in the shape of a "mountain". The two adapter pieces 50 are respectively a first adapter piece 50a and a second adapter piece 50b. The first adapter piece 50a is installed on the side of the first plastic part 30a away from the top cover 10, and is in contact with the first flange part 42 of the first pole 40a. The first adapter piece 50a is detachably connected to the first pole 40a.

The first adapter piece 50a includes a first main body part 51, a first adapter part 52 and a first bending part 53. The first adapter part 52 and the first bending part 53 are both fixedly connected to the first main body part 51. one side. The first bending portion 53 is fixedly connected between the first main body portion 51 and the first adapter portion 52 . Through the first bending portion 53 , the first main body portion 51 can be bent relative to the first adapter portion 52 .

In this embodiment, the first main body part 51 is electrically connected to the tabs of the bare battery core. For example, the first main body part 51 may be electrically connected to the tabs of the bare battery core by welding. The first main body part 51 is provided with a plurality of first fixing holes 54, escape notches 55 and two first recessed parts 51a. Among them, two first recessed portions 51a are spaced apart along the length direction of the first main body portion 51 (the Y-axis direction in the figure). The opening of each first recessed portion 51 a is located on the surface of the first main body portion 51 facing the first bending portion 53 . Each first recessed portion 51 a is recessed from the surface of the first main body 51 toward the first bending portion 53 in the direction of the first main body 51 . This arrangement not only facilitates the first main body part 51 to be bent relative to the first adapter part 52 through the first bending part 53, but also reduces the weight of the first adapter piece 50a.

The opening of the escape notch 55 is located on the surface of the first main body part 51 away from the first bending part 53 . The escape notch 55 is recessed from the surface of the first main body part 51 away from the first bending part 53 toward the direction of the first bending part 53 . The avoidance notch 55 is used to avoid the liquid injection hole 12 to prevent the first adapter piece 50a from blocking the liquid injection hole 12 . The plurality of first fixing holes 54 all penetrate the first main body 51 along the thickness direction of the first main body 51 and are spaced apart from each other and spaced apart from the escape notches 55 .

During the assembly process of the end cap assembly 120, the first adapter portion 52 is inserted between the first contact portion 33 of the first plastic part 30a and the first flange portion 42 of the first pole 40a, and is connected with the first flange portion 42 of the first pole 40a. One pole 40a and the first contact portion 33 are both in contact with each other. For example, the first adapter part 52 is detachably inserted between the first contact part 33 and the first pole 40a. The first contact protrusion 332 of the first contact portion 33 contacts the first adapter portion 52 .

The first main body part 51 is bent toward the first auxiliary part 32 of the first plastic part 30a through the first bending part 53 relative to the first adapter part 52, and connects the plurality of first fixing holes 54 and the plurality of first protrusions 34 They are arranged in one-to-one correspondence, so that each first protruding post 34 can be inserted into a first fixing hole 54 , and each first protruding post 34 is fixedly connected to the first main body part 51 . The first auxiliary part 32 is located between the first main body part 51 of the first adapter piece 50a and the top cover 10, and the first auxiliary part 32 completely covers the first main body part 51 of the first adapter piece 50a. It can be understood that by allowing the first auxiliary part 32 to completely cover the first main body part 51 , the risk of short circuit between the first adapter piece 50 a and the top cover 10 can be further reduced.

It should be noted that the first protruding post 34 can be formed into a mushroom head-shaped fixing structure by hot melting, so that the first protruding post 34 and the first main body portion 51 can be fixed, so that the first adapter piece 50a can be connected with the first adapter piece 50a. The first plastic part 30a is tightly fitted.

Under this setting, on the one hand, the first adapter piece 50a and the first pole 40a are detachably connected, which can save the laser welding process, which can not only simplify the production process of the energy storage device 1, but also avoid the plastic parts 30 from being damaged. The high temperature of the laser welding process melts the joint surface of the plastic part 30 and the top cover 10 to enhance the strength of the joint surface and avoid the problem of leakage of the energy storage device 1 . On the other hand, the first adapter piece 50a is in close contact with the first plastic part 30a, so that the size of the end cover assembly 120 in the thickness direction is reduced, thereby increasing the space in the height direction of the energy storage device 1, thereby helping To improve the energy density of the energy storage device 1. At the same time, the first plastic part 30a is injection molded between the first adapter piece 50a and the top cover 10, thereby reducing the risk of short circuit between the first adapter piece 50a and the top cover 10 and ensuring the reliable use of the energy storage device 1 sex.

Please refer to FIG. 11 , FIG. 12 and FIG. 14 in conjunction. FIG. 14 is a schematic structural diagram of the second adapter piece 50b in the end cover assembly 120 shown in FIG. 5 .

The second adapter piece 50b includes a second main body part 56, a second adapter part 57 and a second bending part 58. The second adapter part 57 and the second bending part 58 are both fixedly connected to the second main body part 56. one side. The second bending portion 58 is fixedly connected between the second main body portion 56 and the second adapter portion 57 . Through the second bending portion 58 , the second main body portion 56 can be bent relative to the second adapter portion 57 .

In this embodiment, the second main body part 56 is electrically connected to the tabs of the bare battery core. For example, the second main body part 56 may be electrically connected to the tabs of the bare battery core by welding. The second main body part 56 is provided with a plurality of second fixing holes 59 and two second recessed parts 56a. Among them, two second recessed portions 56a are spaced apart along the length direction of the second main body portion 56 (the Y-axis direction in the figure). The opening of each second recessed portion 56 a is located on the surface of the second main body portion 56 facing the second bending portion 58 . Each second recessed portion 56a is recessed from the surface of the second main body portion 56 toward the second bending portion 58 in the direction of the second main body portion 56 . This arrangement not only facilitates the second main body part 56 to be bent relative to the second adapter part 57 through the second bending part 58, but also reduces the weight of the second adapter piece 50b. The plurality of second fixing holes 59 all penetrate the second main body part 56 along the thickness direction of the second main body part 56 and are spaced apart from each other.

During the assembly process of the end cap assembly 120, the second adapter portion 57 is inserted between the second contact portion 37 of the second plastic part 30b and the second flange portion 44 of the second pole 40b, and is connected with the second flange portion 44 of the second pole post 40b. Both the two pole posts 40b and the second contact portion 37 are in contact with each other. For example, the second adapter part 57 is detachably inserted between the second contact part 37 and the second pole 40b. The second contact protrusion 372 of the second contact portion 37 contacts the second adapter portion 57 .

The second main body part 56 is bent toward the second auxiliary part 36 of the second plastic part 30b through the second bending part 58 relative to the second adapter part 57, and the plurality of second fixing holes 59 and the plurality of second protrusions 38 are formed. They are arranged in one-to-one correspondence, so that each second protruding post 38 can be inserted into a second fixing hole 59 , and each second protruding post 38 is fixedly connected to the second main body part 56 . The second auxiliary part 36 is located between the second main body part 56 of the second adapter piece 50b and the top cover 10, and the second auxiliary part 36 completely covers the second main body part 56 of the second adapter piece 50b. It can be understood that by allowing the second auxiliary portion 36 to completely cover the second main body portion 56 , the risk of short circuit between the second adapter piece 50 b and the top cover 10 can be further reduced.

It should be noted that the second protruding post 38 can be formed into a mushroom head-shaped fixing structure by hot melting, so that the second protruding post 38 and the second main body portion 56 can be fixed, so that the second adapter piece 50b can be connected with the second adapter piece 50b. The second plastic part 30b is tightly fitted.

Under this setting, on the one hand, the second adapter piece 50b and the second pole 40b are detachably connected, which can save the laser welding process, which can not only simplify the production process of the energy storage device 1, but also avoid the plastic parts 30 from being damaged. The high temperature of the laser welding process melts the joint surface of the plastic part 30 and the top cover 10 to enhance the strength of the joint surface and avoid the problem of leakage of the energy storage device 1 . On the other hand, the second adapter piece 50b is in close contact with the second plastic part 30b, so that the size of the end cover assembly 120 in the thickness direction is reduced, thereby increasing the space in the height direction of the energy storage device 1, thereby helping To improve the energy density of the energy storage device 1. At the same time, the second plastic part 30b is injection molded between the second adapter piece 50b and the top cover 10, thereby reducing the risk of short circuit between the second adapter piece 50b and the top cover 10 and ensuring the reliability of the energy storage device 1. sex.

In the technical solution provided by this application, on the one hand, by providing a contact portion on the plastic part 30, the adapter piece 50 and the pole 40 can be detachably connected, thereby eliminating the need for a laser welding process and simplifying the energy storage device. The production process of 1 can also prevent the plastic part 30 from melting due to the high temperature of the laser welding process, thereby enhancing the strength of the joint surface between the plastic part 30 and the top cover 10 and avoiding the problem of leakage of the energy storage device 1 . On the other hand, the adapter piece 50 is closely attached to the side of the plastic part 30 away from the top cover 10 , which can reduce the size of the end cover assembly 120 in the thickness direction, thereby increasing the height space of the energy storage device 1 , and further improving the efficiency of the energy storage device 1 . Helps improve the energy density of the energy storage device 1. At the same time, the insulator 112 of the casing 110 is used instead of the Mylar sheet to isolate the bare battery core from the main casing 111 to ensure the reliability of the insulation between the bare battery core and the casing 110, so that the plastic part 30 does not need to be used for welding the mic. The boss structure of the pull tab can reduce the size of the plastic part 30 in the thickness direction and increase the height space of the energy storage device 1, which in turn helps to increase the energy density of the energy storage device 1.

This application also provides an electrical equipment. The electrical equipment includes the above-mentioned energy storage device 1. The energy storage device 1 supplies power to the electrical equipment. Among them, the electrical equipment can be new energy vehicles, power storage stations, servers and other equipment that require electricity.

The above description is only a specific implementation mode of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present application. It is within the protection scope of the present application; the embodiments of the present application and the features in the embodiments can be combined with each other if there is no conflict. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims (11)

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.