CN116387654A

CN116387654A - Energy storage device and electric equipment

Info

Publication number: CN116387654A
Application number: CN202310657043.6A
Authority: CN
Inventors: 陈志雄; 洪纯省
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2023-06-05
Filing date: 2023-06-05
Publication date: 2023-07-04
Anticipated expiration: 2043-06-05
Also published as: CN116387654B

Abstract

The application discloses an energy storage device and consumer relates to the energy storage field. The energy storage device includes: a case formed with an accommodation space having an open end, an electrode assembly, an end cap assembly, and a getter; the electrode assembly is disposed in the receiving space; the end cover assembly covers the open end and comprises an end cover and an insulating piece, the end cover is provided with an air pressure balancing assembly, and the insulating piece is provided with an air permeable structure corresponding to the air pressure balancing assembly in position; a limiting structure is arranged on the surface of the insulating piece, which is away from the end cover, and a containing space is formed on the limiting structure; the orthographic projection of the limiting structure on the insulating piece and the ventilation structure are not overlapped, an opening facing the electrode assembly is formed on one side of the limiting structure away from the insulating piece, the opening is communicated with the accommodating space and the accommodating space, and the insulating piece seals one side of the limiting structure close to the insulating piece; the getter is arranged in the accommodating space. The application provides an energy storage device has improved energy storage device's performance.

Description

Energy storage device and electric equipment

Technical Field

The present application relates generally to the field of energy storage technology, and more particularly, to an energy storage device and powered device.

Background

Because of the strong timeliness and space properties of energy sources required by people, in order to reasonably utilize the energy sources and improve the utilization rate of the energy, one energy form needs to be stored by one medium or equipment and then is converted into another energy form, and then is released in a specific energy form based on future application requirements. As is well known, to achieve the great goal of carbon neutralization, green energy is currently mainly used to replace fossil energy so as to achieve the purpose of generating green electric energy.

At present, the green energy mainly comprises light energy, wind energy, water potential and the like, and the problems of strong intermittence and large fluctuation of the light energy, the wind energy and the like generally exist, so that the unstable voltage of a green power grid (insufficient electricity in a power utilization peak and too much electricity in a power utilization valley) can be caused, and the unstable voltage can cause damage to the electric power, therefore, the problem of 'wind and light abandoning' is possibly caused by insufficient power utilization requirements or insufficient power grid receiving capability.

To solve the problem of insufficient power demand or insufficient power grid acceptance, an energy storage device must be relied on. The energy storage device converts the electric energy into other forms of energy through physical or chemical means to store the energy, the energy stored by the energy storage device is converted into the electric energy to be released when needed, in short, the energy storage device is similar to a large-scale 'charge pal', when the light energy and the wind energy are sufficient, the electric energy is stored, and the stored electric energy is released when needed.

The existing energy storage (i.e. energy storage) application scene is wider, including aspects such as power generation side energy storage, electric network side energy storage, renewable energy grid-connected energy storage, user side energy storage and the like, the types of corresponding energy storage devices include:

(1) The large energy storage container applied to the energy storage scene at the power grid side can be used as a high-quality active and reactive power regulation power supply in the power grid, so that the load matching of electric energy in time and space is realized, the renewable energy consumption capability is enhanced, and the large energy storage container 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 main operation modes of the small and medium-sized energy storage electric cabinet applied to the industrial and commercial energy storage scenes (banks, shops and the like) at the user side and the household small-sized energy storage box applied to the household energy storage scene at the user side are peak clipping and valley filling. Because of the large price difference of the electricity charge at the peak-valley position according to the electricity consumption requirement, after the energy storage equipment is arranged by a user, in order to reduce the cost, the energy storage cabinet/box is charged usually in the electricity price valley period; and in the peak period of electricity price, the electricity in the energy storage equipment is released for use, so that the purpose of saving electricity charge is achieved. In addition, in remote areas and areas with high occurrence of natural disasters such as earthquake, hurricane and the like, the household energy storage device is equivalent to the fact that a user provides a standby power supply for the user and the power grid, and inconvenience caused by frequent power failure due to disasters or other reasons is avoided.

The energy storage device may be, for example, a secondary battery, which is also called a rechargeable battery or a storage battery, and refers to a battery that can be continuously used by activating an active material by charging after discharging the battery, and the recyclable property of the secondary battery makes the secondary battery a main power source of electric equipment.

As the demand of secondary batteries has increased, performance requirements for various aspects thereof have been increasing, particularly for battery cycle performance and safety performance, and the problem of gas generation during battery cycle is an important factor affecting battery cycle performance and safety performance.

Disclosure of Invention

It is a primary object of the present application to provide an energy storage device with improved performance.

In order to achieve the purposes of the application, the application adopts the following technical scheme:

according to one aspect of the present application, there is provided an energy storage device comprising:

a housing formed with an accommodation space having an open end;

an electrode assembly disposed in the receiving space;

the end cover assembly covers the open end and comprises an end cover and an insulating part which are arranged along a first direction perpendicular to the large surface of the end cover assembly, an air pressure balance assembly is arranged on the end cover, and an air permeable structure corresponding to the air pressure balance assembly in position is arranged on the insulating part; a limiting structure is arranged on the surface, away from the end cover, of the insulating piece, and an accommodating space is formed on the limiting structure; the orthographic projection of the limiting structure on the insulating piece and the ventilation structure have no overlapping area, an opening facing the electrode assembly is formed on one side of the limiting structure away from the insulating piece, the opening is communicated with the accommodating space and the accommodating space, and the insulating piece seals one side of the limiting structure close to the insulating piece;

The air suction piece is arranged in the accommodating space.

According to the energy storage device provided by the embodiment, the insulating part is provided with the limit structure towards one side of the electrode assembly, the limit structure is provided with the accommodating space, the air suction part is arranged in the accommodating space, and the opening of the limit structure is communicated with the accommodating space and the accommodating space, so that the energy storage device can be absorbed by gas generated by electrolyte decomposition in the recycling process through the air suction part, poor contact between the positive electrode plate and the negative electrode plate at the gas production position and the diaphragm is avoided, the integral expansion of lithium precipitation and the appearance of the electrode assembly is avoided, the cycle life and the rate performance deterioration of the energy storage device are avoided, and the use performance and the safety performance of the energy storage device are ensured. Meanwhile, the accommodating space is formed through the limiting structure, so that the assembly of the air suction piece on the end cover assembly is facilitated, and the assembly efficiency of the energy storage device is improved. Furthermore, the sealing limit structure of the insulating part is close to one side of the insulating part, namely, the limit structure is directly formed on the surface of the insulating part, and a region corresponding to the limit structure on the insulating part is not provided with a hole for grooving, so that the structural strength of the insulating part is improved through the limit structure. In addition, because the getter particles in the getter are limited, the gas can be reacted with the gas to absorb the generated gas in the early-stage circulating work of the energy storage device, so that the circulating life of the energy storage device is prolonged. However, the gas generation is continuous in the working process of the energy storage device, after the getter particles in the getter are reacted completely, the getter particles lose the gettering effect, but the getter particles cannot disappear and exist all the time, and if the getter is arranged opposite to the air pressure balancing component, the air pressure balancing component is influenced to open the valve. According to the air suction device, the orthographic projection of the limiting structure on the insulating part and the ventilation structure are free of overlapping areas, so that the air suction part and the air pressure balance assembly are arranged in a staggered mode, the influence on the valve opening of the air pressure balance assembly is avoided, and the safety of the energy storage device is guaranteed.

According to an embodiment of the present application, the insulating member is circular, and the limiting structure includes a first limiting wall and a second limiting wall which are disposed opposite to each other along a radial direction of the insulating member, and a third limiting wall and a fourth limiting wall which are disposed opposite to each other along a circumferential direction of the insulating member, where the first limiting wall, the second limiting wall, the third limiting wall and the fourth limiting wall enclose to form the accommodating space; the third limiting wall and the fourth limiting wall are located between the first limiting wall and the second limiting wall, in the circumferential direction, the first limiting wall and the second limiting wall are opposite to the third limiting wall and provided with a first extending part located outside the accommodating space, and the first limiting wall and the second limiting wall are opposite to the fourth limiting wall and provided with a second extending part located outside the accommodating space.

According to the energy storage device, the first limiting wall, the second limiting wall, the third limiting wall and the fourth limiting wall are enclosed to form the accommodating space, one end of the accommodating space, which faces the direction of the electrode assembly, is opened to form the opening, namely, the gas generated by decomposition of the electrolyte in the recycling process of the energy storage device can enter the accommodating space through the opening in time, and reacts with the getter in the accommodating space to be absorbed, so that the getter efficiency of the getter is improved.

According to an embodiment of the application, the first limiting wall is located along the radial direction on one side, close to the edge of the insulating piece, of the second limiting wall, the first limiting wall is arc-shaped, and the radian of the first limiting wall is matched with the radian of the edge of the insulating piece.

According to the energy storage device provided by the embodiment, the radian of the first limiting wall is matched with the radian of the edge of the insulating part, so that the volume of the accommodating space is relatively increased, the relatively large-volume air suction part is placed, and the air suction capacity of the air suction part is improved.

According to an embodiment of the present application, ventilation holes are formed in at least one of the first limiting wall, the second limiting wall, the third limiting wall and the fourth limiting wall.

According to the energy storage device provided by the embodiment, the air holes are formed in the limiting wall, so that the gas generated by the decomposition of the electrolyte in the recycling process of the energy storage device can enter the accommodating space through the limiting wall, and then reacts with the getter, so that the generated gas can reach each surface of the getter more quickly, and the gettering efficiency of the getter is improved. Meanwhile, through forming the air holes on the limiting wall, the weight of the limiting structure is relatively reduced, and therefore the weight of the single energy storage device can be reduced.

According to an embodiment of the present application, the limit structure further includes a limit piece, a coaxial through hole is provided on the third limit wall and the fourth limit wall, the limit piece is disposed in the through hole of the third limit wall and the fourth limit wall in a penetrating manner, and the getter is located between the limit piece and the insulator.

According to the energy storage device provided by the embodiment, when the air suction piece is placed in the accommodating space, the air suction piece is affected by gravity, the energy storage device falls off from the accommodating space easily when falling off or being impacted by external force, and the blocking of the opening of the accommodating space is formed by arranging the limiting piece, so that the air suction piece can be blocked in the accommodating space through a physical structure, and the stability of the air suction piece in the accommodating space is improved.

According to an embodiment of the present application, in the accommodating space, an included angle between an inner side wall of at least one of the first limiting wall, the second limiting wall, the third limiting wall and the fourth limiting wall and the insulating member is an acute angle.

According to the energy storage device, the included angle between the limiting wall and the end cover and located in the accommodating space is an acute angle, so that the accommodating space is formed into a shape with a small bottom opening, and after the air suction piece is arranged in the accommodating space, the air suction piece is not easy to fall from the accommodating space due to the small opening of the accommodating space, the limiting wall is used for directly limiting the air suction piece, the limiting piece is omitted, the production cost is reduced, and the production assembly efficiency is improved.

According to an embodiment of the present application, the included angle is 45 ° to 60 °.

According to the energy storage device provided by the embodiment, the included angle between the limiting wall and the end cover in the accommodating space can be 45-60 degrees, so that the accommodating space is formed into a shape with a large bottom opening, and the getter is not easy to fall from the accommodating space; meanwhile, the opening is not too small, and the obstruction to the placement of the getter in the accommodating space is avoided.

According to an embodiment of the present application, the limit structure includes a plurality of spacing grids that the interval set up, a plurality of be formed with coaxial mounting hole on the spacing grid respectively, the getter inserts and locates a plurality of in the mounting hole.

According to the energy storage device provided by the embodiment, the mounting holes are formed through the limiting grids, and the air suction piece is fixed on the end cover in an inserting mode, so that more surfaces in the circumferential direction of the air suction piece can be directly exposed, and the air suction efficiency of the air suction piece is improved; meanwhile, through inserting in the mounting hole, the limiting grille directly forms the limit of falling of the air suction piece under the gravity, so that the arrangement of an additional limiting piece is avoided, and the stability of the limiting structure is improved.

According to an embodiment of the present application, a sacrificial layer is formed on at least a part of the surface of the getter, and the sacrificial layer is configured to melt when the temperature is greater than or equal to a preset temperature so as to expose the coated surface of the getter; the sacrificial layer is made of an insulating material and does not react with electrolyte in the energy storage device, and the preset temperature is 45-60 ℃.

According to the energy storage device provided by the embodiment, the sacrificial layer with the melting point being higher than the temperature of the formation stage is adopted to protect the air suction particles in the pore layer, and the air suction particles in the pores are isolated from the external environment in the formation stage so as to prevent the air suction particles from reacting with the generated gas in the formation stage, so that the effectiveness of the air suction particles is maintained; after the formation stage of the energy storage device, when the temperature of the energy storage device is greater than or equal to the melting temperature of the sacrificial layer, the sacrificial layer is melted to expose the air suction particles, so that generated gas is effectively absorbed in the circulation process when the subsequent energy storage device is used, and the reliability of the air suction particles in the circulation work of the energy storage device is improved.

According to an embodiment of the present application, the sacrificial layer is at least one of paraffin wax, wax acid and polyethylene wax.

The melting points of the paraffin, the wax acid and the polyethylene wax are higher than the temperature of the formation stage, and the paraffin, the wax acid and the polyethylene wax keep solid phase in the formation stage so as to avoid gas production reaction of the gas suction particles and the formation stage; when the temperature of the follow-up energy storage device is higher than the melting points of paraffin, wax acid and polyethylene wax, the paraffin, the wax acid and the polyethylene wax are melted to be in a liquid state, and flow into the accommodating space of the shell of the energy storage device through the opening after being melted, so that the air suction particles are exposed.

According to an embodiment of the present application, the getter layer comprises:

the accommodating layer is provided with a hole, and the hole extends through the side wall of the accommodating layer to leak out;

and a getter material filling the pores.

In the energy storage device according to the present embodiment, the pores are formed in the storage layer, and the pores leak from the side walls of the storage layer, and the getter material is filled in the pores, so that the generated gas can be effectively absorbed by the getter material filled in the pores.

a first support layer;

the second supporting layer is arranged opposite to the first supporting layer;

and the getter material layer is arranged between the first supporting layer and the second supporting layer in a clamping way.

According to the energy storage device provided by the embodiment, the getter material layer is shaped through the upper supporting layer and the lower supporting layer, the binding force of the structure is improved, and structural layering is prevented from being broken before the shell is filled in the shell, so that the getter material layer is conveniently placed on the limiting structure.

According to an embodiment of the present application, a plurality of limit structures are disposed on a surface of the insulating member facing away from the end cover, the energy storage device includes a plurality of getter members, and at least one getter member is disposed in the accommodating space of each limit structure.

According to the energy storage device, through the arrangement of the plurality of limiting structures, the air suction piece is arranged in each limiting structure, so that the space between the end cover and the electrode assembly can be fully utilized, the space utilization rate is increased, and the energy density of the energy storage device is ensured, and meanwhile, the cycle performance and the safety performance of the energy storage device are improved.

According to another aspect of the present application, there is provided an electric device, including the energy storage device provided by any one of the embodiments.

According to the electric equipment provided by the embodiment, the insulating piece in the energy storage device is provided with the limit structure towards one side of the electrode assembly, the limit structure is provided with the accommodating space, the air suction piece is arranged in the accommodating space, and the opening of the limit structure is communicated with the accommodating space and the accommodating space, so that the energy storage device can be absorbed by gas generated by electrolyte decomposition in the cyclic use process through the air suction piece, poor contact between the positive electrode piece and the negative electrode piece of the gas production position and the diaphragm is avoided, the integral expansion of lithium precipitation and the appearance of the electrode assembly is avoided, the cyclic service life and the multiplying power performance deterioration of the energy storage device are further avoided, and the use performance and the safety performance of the energy storage device are guaranteed. Meanwhile, the accommodating space is formed through the limiting structure, so that the assembly of the air suction piece on the end cover assembly is facilitated, and the assembly efficiency of the energy storage device is improved. Furthermore, the sealing limit structure of the insulating part is close to one side of the insulating part, namely, the limit structure is directly formed on the surface of the insulating part, and a region corresponding to the limit structure on the insulating part is not provided with a hole for grooving, so that the structural strength of the insulating part is improved through the limit structure. In addition, because the getter particles in the getter are limited, the gas can be reacted with the gas to absorb the generated gas in the early-stage circulating work of the energy storage device, so that the circulating life of the energy storage device is prolonged. However, the gas generation is continuous in the working process of the energy storage device, after the getter particles in the getter are reacted completely, the getter particles lose the gettering effect, but the getter particles cannot disappear and exist all the time, and if the getter is arranged opposite to the air pressure balancing component, the air pressure balancing component is influenced to open the valve. According to the air suction device, the orthographic projection of the limiting structure on the insulating part and the ventilation structure are free of overlapping areas, so that the air suction part and the air pressure balance assembly are arranged in a staggered mode, the influence on the valve opening of the air pressure balance assembly is avoided, and the safety of the energy storage device is guaranteed.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The above and other features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a schematic diagram of a household energy storage system provided herein.

Fig. 2 is a schematic diagram of an energy storage device according to an embodiment of the present application.

Fig. 3 is a schematic front view of an end cap assembly according to an embodiment of the present application.

FIG. 4 is a schematic view of the reverse side structure of an end cap assembly provided in one embodiment of the present application.

Fig. 5 is a schematic view of a getter and a limiting structure according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a limiting structure and a limiting member according to an embodiment of the present application.

Fig. 7 is a schematic structural diagram of a limiting structure according to an embodiment of the present application.

Fig. 8 is a schematic structural diagram of a limiting structure according to another embodiment of the present application.

Fig. 9 is a schematic view of a getter and a limiting structure according to another embodiment of the present application.

Fig. 10 is a schematic structural diagram of a limiting structure according to another embodiment of the present application.

Fig. 11 is a schematic view of a getter and a limiting structure according to still another embodiment of the present application.

Fig. 12 is a schematic view of a limiting structure according to still another embodiment of the present application.

Fig. 13 is a schematic structural view of a getter provided in an embodiment of the present application.

Fig. 14 is a schematic view of disposing a sacrificial layer on a getter according to an embodiment of the present application.

Fig. 15 is a schematic structural view of a getter provided in another embodiment of the present application.

Fig. 16 is a schematic view of disposing a sacrificial layer on a getter according to another embodiment of the present application.

Reference numerals illustrate:

10. an energy storage device; 20. an electric energy conversion device; 30. user load;

100. a housing; 110. an open end; 120. an accommodation space;

200. an electrode assembly;

300. an end cap assembly; 310. an end cap; 320. an insulating member; 330. an air pressure balancing assembly; 340. a ventilation structure; 350. an electrode terminal;

400. a limit structure; 410. an accommodating space; 420. an opening; 431. a first limiting wall; 432. the second limiting wall; 433. a third limiting wall; 434. a fourth limiting wall; 435. a first extension; 436. a second extension; 440. a through hole; 450. a limiting piece; 460. a limiting grille; 470. a mounting hole; 480. ventilation holes;

500. A getter; 510. an accommodating layer; 521. a first support layer; 522. a second support layer; 523. a getter material layer;

600. a sacrificial layer;

700. a connecting piece; 710. a connecting sheet; 720. a confluence plate.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.

Taking a household energy storage scenario in a user side energy storage as an example, fig. 1 shows a household energy storage system, where the household energy storage system includes an energy storage device 10 and an electric energy conversion device 20 (such as a photovoltaic panel), and a user load 30 (such as a street lamp, a household appliance, etc.), and the energy storage device 10 is a small energy storage box, and may be installed on an outdoor wall by a wall hanging manner. Specifically, the power conversion device 20 may convert solar energy into electric energy during the low electricity price period, and store the electric energy by the energy storage device 10, and then supply the electric energy to the consumer load 30 for use during the peak electricity price period, or supply the electric energy to the consumer load 30 for use during the power outage/power failure period of the power grid.

In combination with the above-described case of energy storage by physical or electrochemical means, for example, the energy storage device 10 includes at least one group of chemical batteries, and chemical elements in the chemical batteries are used as an energy storage medium, so as to implement a charging and discharging process through chemical reaction or change of the energy storage medium. In short, the electric energy generated by light energy and wind energy is stored in at least one group of chemical batteries through chemical reaction or change of the energy storage medium, and when the use of external electric energy reaches a peak, the electric quantity stored in at least one group of chemical batteries is released for use through the chemical reaction or change of the energy storage medium, or is transferred to a place where the electric quantity is short for use.

Embodiments of the present application provide an energy storage device that may be, but is not limited to, a single battery, a battery module, a battery pack, a battery system, and the like. The unit cell may be a lithium ion secondary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, and the unit cell may be a cylinder, a flat body, a rectangular parallelepiped, or the like, which is not limited in the embodiment of the present application.

Next, the energy storage device is explained in detail by taking the energy storage device as a round single battery as an example.

Fig. 2 illustrates a schematic structural diagram of an energy storage device 10 according to an embodiment of the present application. As shown in fig. 2 to 11, the energy storage device 10 includes a case 100, an electrode assembly 200, an end cap assembly 300, and a getter 500, the case 100 is formed with a receiving space 120 having an open end 110, and the electrode assembly 200 is disposed in the receiving space 120; the end cover assembly 300 is covered on the open end 110, the end cover assembly 300 comprises an end cover 310 and an insulating member 320 which are arranged along a first direction vertical to the large surface of the end cover assembly 300, the end cover 310 is provided with a pneumatic balance assembly 330, and the insulating member 320 is provided with a ventilation structure 340 corresponding to the pneumatic balance assembly 330 in position; the surface of the insulating member 320 facing away from the end cover 310 is provided with a limit structure 400, and the limit structure 400 is formed with an accommodating space 410; the orthographic projection of the limiting structure 400 on the insulating member 320 and the ventilation structure 340 have no overlapping area, an opening 420 facing the electrode assembly 200 is formed on one side of the limiting structure 400 away from the insulating member 320, the opening 420 communicates the accommodating space 410 and the accommodating space 120, and the insulating member 320 seals one side of the limiting structure 400 close to the insulating member 320; the getter 500 is disposed in the accommodating space 410.

The application provides an energy storage device 10, insulating piece 320 is provided with limit structure 400 towards electrode assembly 200 one side, limit structure 400 is formed with accommodation space 410, getter piece 500 sets up in accommodation space 410, limit structure 400's opening 420 intercommunication accommodation space 410 and accommodation space 120, can be with energy storage device 10 because of the gaseous absorption that electrolyte decomposition produced in cyclic use through getter piece 500 from this, thereby avoid producing the poor contact of positive, negative pole piece and the diaphragm in gas position, avoided causing the whole inflation of lithium and electrode assembly 200 outward appearance that separates, and then avoided causing energy storage device 10 cycle life and multiplying power performance to worsen, guaranteed energy storage device 10's performance and security performance. Meanwhile, the accommodating space 410 is formed through the limiting structure 400, so that the assembly of the getter 500 on the end cover assembly 300 is facilitated, and the assembly efficiency of the energy storage device 10 is improved. Furthermore, the insulating member 320 seals one side of the limiting structure 400 close to the insulating member 320, that is, the limiting structure 400 is directly formed on the surface of the insulating member 320, and the region of the insulating member 320 corresponding to the limiting structure 400 is not perforated and grooved, so that the structural strength of the insulating member 320 is improved through the limiting structure 400.

In addition, since the getter particles in the getter 500 are limited, the gas generated by the gas can be absorbed by the reaction of the gas during the previous cycle of the energy storage device 10, so as to improve the cycle life of the energy storage device 10. However, the gas generation is continued during the operation of the energy storage device 10, and after the getter particles in the getter 500 react completely, the getter particles lose the gettering effect, but the getter particles do not disappear and remain, and if the getter 500 is disposed opposite to the air pressure balance component 330, the air pressure balance component 330 is affected to open the valve. The orthographic projection of the limit structure 400 on the insulating piece 320 and the ventilation structure 340 do not have an overlapping area, namely the getter piece 500 and the air pressure balance component 330 are arranged in a staggered mode, the influence on the valve opening of the air pressure balance component 330 is avoided, and the safety of the energy storage device 10 is ensured.

Specifically, as shown in fig. 2, the housing 100 has a cylindrical structure with an open end 110, and the energy storage device 10 includes an end cap assembly 300 to seal against the open end 110 of the housing 100; of course, the housing 100 may also be a cylindrical structure having two open ends 110, where the energy storage device 10 includes one end cap assembly 300 and one cover plate, or two end cap assemblies 300, such that one end cap assembly 300 and one cover plate, or two end cap assemblies 300 are capable of sealing the two open ends 110 of the housing 100, respectively.

Specifically, as shown in fig. 2 to 4, the end cap assembly 300 includes an end cap 310, an insulating member 320, and an electrode terminal 350, wherein the end cap 310 and the insulating member 320 are stacked along a first direction perpendicular to a large surface of the end cap assembly 300, the end cap 310 is located at a side of the insulating member 320 facing away from the electrode assembly 200, and the electrode terminal 350 is disposed through the end cap 310 and the insulating member 320 to connect the end cap 310 and the insulating member 320. One end of the electrode terminal 350 is connected to the electrode assembly 200, and the other end is exposed outside the end cap assembly 300 to serve as an output terminal of the energy storage device 10; the end cap assembly 300 is further provided with a liquid injection hole for injecting electrolyte into the accommodating space 120 of the energy storage device 10. The large surface of the end cap assembly 300 is the largest surface of the end cap assembly 300, and the electrode terminal 350, the liquid injection hole and the air pressure balancing assembly 330 are disposed on the largest surface of the end cap 310; the air pressure balance assembly 330 may be an explosion proof valve disposed on a large surface of the end cap 310.

Specifically, the electrode assembly 200 includes a positive electrode sheet, a negative electrode sheet, and a separator that are stacked together, with the separator being located between the positive electrode sheet and the negative electrode sheet, and the ends of the positive electrode sheet and the negative electrode sheet each having tabs to form positive tabs and negative tabs of the energy storage device 10. The positive electrode lug and the negative electrode lug can be positioned at the same end of the electrode assembly 200 or at different ends of the electrode assembly 200, and when the positive electrode lug and the negative electrode lug are positioned at the same end of the electrode assembly 200, the positive electrode lug and the negative electrode lug respectively comprise a positive electrode column and a negative electrode column with the end cover assembly 300 so as to realize the output of electric energy of the electrode assembly 200 through the positive electrode column and the negative electrode column; when the positive and negative electrode tabs are positioned at both ends of the electrode assembly 200, one of the positive and negative electrode tabs is connected with the electrode terminal 350 included in the cap assembly 300, and the other is connected with the bottom of the case 100 or the electrode terminal 350 included in the other cap assembly 300 to achieve the output of the electric power of the electrode assembly 200 through the electrode terminal 350 of the cap assembly 300 and the bottom of the case 100 or through the electrode terminals 350 of both cap assemblies 300.

Specifically, as shown in fig. 3 and 4, the energy storage device 10 further includes a connection member 700, and the connection of one tab of the electrode assembly 200 with one electrode terminal 350 of the cap assembly 300 and the connection of the other tab of the electrode assembly 200 with the bottom of the case 100 can be accomplished through the connection member 700.

As shown in fig. 3 and 4, the connection member 700 includes a connection piece 710 and a bus plate 720, one end of the connection member 700 is connected with the end cap assembly 300, the other end is connected with the bus plate 720, and the bus plate 720 is used for being connected with the tab of the electrode assembly 200; when the connecting piece 700 is connected with the tab of the electrode assembly 200, and after the bus plate 720 is folded back through the flexible connecting piece 710, the bus plate 720 is located above the limiting structure 400, and the limiting structure 400 can be used for supporting the bus plate 720, so that on one hand, the bending of the connecting piece 710 can be buffered, the connecting piece 710 is prevented from being excessively bent and is easy to break, on the other hand, the bus plate 720 can be supported always and reliably, and the overall structural stability of the connecting piece 700 is enhanced. In addition, the getter 500 is disposed between the end cap assembly 300 and the electrode assembly 200, so that the space between the end cap assembly 300 and the electrode assembly 200 can be effectively utilized to increase the space utilization rate of the energy storage device 10, and improve the cycle performance and safety performance of the energy storage device 10 while ensuring the energy density of the energy storage device 10.

Specifically, as shown in fig. 7 to 9, the insulating member 320 is circular, and the limiting structure 400 includes a first limiting wall 431 and a second limiting wall 432 that are disposed opposite to each other along a radial direction of the insulating member 320, and a third limiting wall 433 and a fourth limiting wall 434 that are disposed opposite to each other along a circumferential direction of the insulating member 320, where the first limiting wall 431, the second limiting wall 432, the third limiting wall 433 and the fourth limiting wall 434 enclose to form an accommodating space 410; the third limiting wall 433 and the fourth limiting wall 434 are located between the first limiting wall 431 and the second limiting wall 432, and in the circumferential direction, the first limiting wall 431 and the second limiting wall 432 opposite to the third limiting wall 433 have a first extension part 435 located outside the accommodating space 410, and the first limiting wall 431 and the second limiting wall 432 opposite to the fourth limiting wall 434 have a second extension part 436 located outside the accommodating space 410. The first limiting wall 431, the second limiting wall 432, the third limiting wall 433 and the fourth limiting wall 434 enclose to form the accommodating space 410, one end of the accommodating space 410, which faces the direction of the electrode assembly 200, is opened to form the opening 420, that is, the gas generated by the decomposition of the electrolyte of the energy storage device 10 in the cyclic use process can timely enter the accommodating space 410 through the opening 420, and react with the getter 500 in the accommodating space 410 to be absorbed, so that the getter efficiency of the getter 500 is improved.

The shape and size of the accommodating space 410 formed by enclosing the first limiting wall 431, the second limiting wall 432, the third limiting wall 433 and the fourth limiting wall 434 are matched with those of the getter 500, so that the getter 500 can utilize the accommodating space 410 as much as possible, and the getter 500 has sufficient gettering capability. Meanwhile, the accommodating space 410 formed by enclosing the first limiting wall 431, the second limiting wall 432, the third limiting wall 433 and the fourth limiting wall 434 is matched with the shape of the end cover assembly 300, for example, when the end cover assembly 300 is a circular end cover assembly 300, when the accommodating space 410 is formed at the edge of the end cover assembly 300, that is, the first limiting wall 431 close to the edge of the end cover assembly 300 can be an arc-shaped wall matched with the radian of the edge of the insulating member 320, so as to relatively increase the volume of the accommodating space 410, to place the getter 500 with a relatively large volume, and improve the gettering capability of the getter 500.

Specifically, as shown in fig. 10, at least one of the first limiting wall 431, the second limiting wall 432, the third limiting wall 433 and the fourth limiting wall 434 is formed with an air vent 480. Through forming the ventilation holes 480 on at least one of the first limiting wall 431, the second limiting wall 432, the third limiting wall 433 and the fourth limiting wall 434, the gas generated by the decomposition of the electrolyte in the cyclic use process of the energy storage device 10 can be reacted with the getter 500 through the first limiting wall 431, the second limiting wall 432, the third limiting wall 433 or the fourth limiting wall 434 in the accommodating space 410, so that the generated gas can reach each surface of the getter 500 more quickly, and the getter efficiency of the getter 500 is improved. Meanwhile, by forming the air holes 480 on the limiting wall, the weight of the limiting structure 400 is relatively reduced, so that the weight of the single energy storage device 10 can be reduced.

In one embodiment of the present application, as shown in fig. 6 and 7, the limiting structure 400 further includes a limiting member 450, where the limiting member 450 is detachably connected to two limiting walls of the first limiting wall 431, the second limiting wall 432, the third limiting wall 433 and the fourth limiting wall 434, and the limiting member 450 is located on the opening 420 of the accommodating space 410 after being connected to the limiting wall. When the getter 500 is placed in the accommodating space 410, the getter 500 is easily dropped from the accommodating space 410 when the energy storage device 10 falls or is impacted by external force due to the influence of gravity, and the stopper 450 is provided to form a seal of the opening 420 of the accommodating space 410, so that the getter 500 can be sealed in the accommodating space 410 through a physical structure, and the stability of the getter 500 in the accommodating space 410 is improved.

The limiting member 450 may be, for example, a limiting rod, and two opposite third limiting walls 433 and fourth limiting walls 434 form two through holes 440 on the same axis, and the limiting rod is inserted into the two through holes 440 to form a seal for the opening 420 of the accommodating space 410. Because the diameter of the limiting rod is smaller than the size of the opening 420 of the accommodating space 410, the gas production can not enter the accommodating space 410 to react with the getter 500. Of course, the limiting member 450 may be connected to the limiting wall by a clamping, bonding, welding, etc., which is not limited in this application.

The diameters of the limiting rods and the width of the accommodating space 410 are 1/5 to 1/2, for example, 1/5, 1/4, 1/3, 1/2, etc., which are not listed here. If the limiting rod is too narrow and the strength is insufficient, the limiting rod is pressed and deformed or even broken under the influence of the gravity of the air suction piece 500, and cannot play a reliable blocking role; if the limit rod is too wide, an air passing gap formed between the limit rod and the side wall is too narrow, which affects the air suction efficiency of the air suction member 500. The size ratio of the diameter of the limiting rod to the width of the accommodating space 410 is 1/5 to 1/2, so that the strength of fixing is ensured, and the suction efficiency of the suction piece 500 is prevented from being influenced.

In the direction perpendicular to the large surface of the end cap assembly 300, a certain interval is formed between the limiting rod and the air suction member 500, and the interval may be 1 mm-2 mm, for example, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, etc., which are not specifically recited herein. If the spacing between the spacing rod and the getter 500 in the height direction is too narrow or even the spacing rod abuts the getter 500, the contact area of the getter 500 and the gas is affected, and the gettering efficiency of the getter 500 is reduced; if the gap is too wide, the getter 500 is thinner and the getter particles are less, thereby affecting the amount of getter 500 that absorbs the generated gas. The spacing between the spacing rod and the getter 500 is 1 mm-2 mm, so that the influence on the contact area of the getter 500 and gas is avoided, the getter efficiency of the getter 500 is reduced, the influence on the thickness of the getter 500 is avoided, and the gas generating absorption capacity of the getter 500 is ensured.

The limiting structure 400 may include a plurality of limiting members 450, where the plurality of limiting members 450 further form a limitation on the getter 500 in the accommodating space 410, and the plurality of limiting members 450 are disposed in parallel or in a crossing manner.

The materials of the limiting wall and the limiting member 450 may be the same as those of the insulating member 320, so as to avoid reaction with the electrolyte, and ensure the structural strength and reliability of the limiting structure 400.

In one embodiment of the present application, as shown in fig. 8 and 9, in the accommodating space 410, an included angle between an inner side wall of at least one of the first limiting wall 431, the second limiting wall 432, the third limiting wall 433 and the fourth limiting wall 434 and the insulating member 320 is an acute angle. Through making the contained angle between the inside wall of at least one of first spacing wall 431, second spacing wall 432, third spacing wall 433 and fourth spacing wall 434 and insulator 320 be the acute angle, then make accommodation space 410 form the shape that the end is big mouth little, getter 500 has certain elasticity, set up getter 500 behind accommodation space 410, because the opening of accommodation space 410 is less, getter 500 is difficult for dropping from accommodation space 410, through first spacing wall 431, second spacing wall 432, third spacing wall 433 and fourth spacing wall 434 have formed spacingly directly to getter 500, can save setting up limiter 450, reduce manufacturing cost, production assembly efficiency has been improved.

The included angle between the inner side wall of at least one of the first limiting wall 431, the second limiting wall 432, the third limiting wall 433 and the fourth limiting wall 434 and the insulating member 320 may be 45 ° to 60 °, for example 45 °, 47 °, 50 °, 52 °, 55 °, 58 °, 60 °, and the like, which are not specifically described herein. By making the included angle between the inner side wall of at least one of the first limiting wall 431, the second limiting wall 432, the third limiting wall 433 and the fourth limiting wall 434 and the insulating member 320 be 45 ° to 60 °, the accommodating space 410 forms a shape with a small bottom opening, and the getter 500 is not easy to drop from the accommodating space 410; at the same time, it is ensured that the opening is not too small, avoiding obstruction of the placement of the getter 500 in the receiving space 410.

In one embodiment of the present application, as shown in fig. 11 and 12, the limiting structure 400 includes a plurality of limiting grids 460, mounting holes 470 are formed on the limiting grids 460, the mounting holes 470 are communicated to form the accommodating space 410, and the getter 500 is inserted into the mounting holes 470. The mounting holes 470 are formed through the limiting grids 460, and the getter 500 is fixed on the end cover assembly 300 in an inserting manner, so that more surfaces of the getter 500 in the circumferential direction can be directly exposed, and the getter efficiency of the getter 500 is improved; meanwhile, through inserting in the mounting hole 470, the limiting grating 460 directly forms the limit for the getter 500 falling under gravity, so that the setting of an additional limiting part is avoided, and the stability of the limiting structure is improved.

The limiting structure 400 includes a plurality of limiting grids 460 arranged in parallel, and mounting holes 470 on the limiting grids 460 arranged in parallel are located on the same axis and are communicated. Of course, the plurality of limiting grids 460 may also be arranged in non-parallel, which is not limited in this application.

In one embodiment of the present application, as shown in fig. 13, the getter 500 has a block structure, the getter 500 includes a receiving layer 510 and a getter material, a hole is formed in the receiving layer 510, the hole extends through a sidewall of the receiving layer 510, that is, the hole leaks out from the sidewall of the receiving layer 510, the getter material is filled in the hole, and the generated gas can be effectively absorbed by the getter material filled in the hole.

Wherein, the accommodating layer 510 may be a magic pad, and the magic pad is formed with pores, and the getter material may be getter particles, and the getter particles are filled in the pores of the magic pad, so that the pores can be ensured to be filled with the getter material; meanwhile, gaps are formed among the air suction particles to form a gas channel, so that generated gas can enter the middle part of the air suction piece 500 better to react with as many air suction particles as possible, and the air suction capacity and the air suction efficiency of the air suction piece 500 are improved. Of course, the accommodating layer 510 may be formed with other pores capable of filling the getter particles, which is not limited in this application.

Wherein the getter particles are formed of a material such as at least one of activated carbon, carbon nanotubes, alkali metal hydroxide, zirconium vanadium iron ternary alloy, cobalt oxide, copper oxide, potassium permanganate or magnesium oxide. During normal recycling of the energy storage device 10, the energy storage device 10 may have internal components such as: harmful gases such as carbon dioxide, oxygen, carbon monoxide or hydrofluoric acid, etc., may be used to prepare the corresponding getter particles, for example, carbon dioxide using activated carbon particles, carbon nanotubes, hydroxide particles of alkali metals, for the type of gas generated inside the energy storage device 10; the oxygen uses zirconium vanadium iron ternary alloy particles; the carbon monoxide uses cobalt oxide, copper oxide or potassium permanganate and other particles; the hydrofluoric acid uses the magnesium oxide particles to absorb the generated gas in a targeted manner, so that the air suction capability and the air suction efficiency of the air suction piece 500 are improved.

The accommodating layer 510 is rectangular, for example, and the accommodating layer 510 has a top surface facing the insulating member 320, a bottom surface facing the electrode assembly 200, and four side surfaces between the top surface and the bottom surface. The four sides of the receiving layer 510 may be formed with a plurality of pores so that the generated gas is absorbed by the getter particles exposed on the four sides. Since the gas enters the gas collection chamber, the gas generated can be absorbed more effectively by providing the getter particles on the side surface of the housing layer 510. Of course, the apertures may be formed only on a portion of the side, top or bottom surfaces, which is not limited in this application.

The receiving layer 510 may also have a cylindrical shape, a pentagonal prism shape, a hexagonal prism shape, a truncated cone shape, or an irregular shape, which is not limited in this application.

The accommodating space 410 may be provided with a block-shaped getter 500, and the size and shape of the getter 500 may be matched with those of the accommodating space 410, so that the side wall of the accommodating space 410 may form a limit on the getter 500, and meanwhile, the density of the getter in the accommodating space 410 may be increased, so as to improve the absorption capacity of the generated gas, and further improve the usability and safety performance of the energy storage device 10. Of course, two, three or more getter members 500 with block structures may be disposed in the accommodating space 410, and the plurality of getter members 500 may be disposed in the same layer or may be disposed in a stacked manner, and the sizes and shapes of the plurality of getter members 500 may be the same or different.

Specifically, as shown in fig. 14, a sacrificial layer 600 is disposed on at least a portion of the surface of the accommodating layer 510, and when the sacrificial layer 600 is configured to be greater than or equal to a preset temperature, the sacrificial layer 600 melts to expose the surface of the getter 500 covered by the cover; the sacrificial layer 600 is an insulating material and does not react with the electrolyte in the energy storage device 10, and the preset temperature is 45-60 ℃, for example, 45 ℃, 48 ℃, 50 ℃, 52 ℃, 55 ℃, 57 ℃, 60 ℃, etc. In a preferred embodiment, the surfaces of the containment layer 510 are all covered by the sacrificial layer 600.

Since a large amount of gas is produced by the electrode assembly 200 at the formation stage (about 45 ℃) in the production process of the electrode assembly 200, the liquid injection hole is not closed at this time, and the gas produced at the formation stage is usually sucked out by adopting a corresponding gas production and absorption device; at this time, the getter particles have a problem of early gettering in the formation stage, so that the getter particles fail after gettering in the formation stage, and the generated gas cannot be effectively absorbed during the cycle of the energy storage device 10 in the subsequent use. Therefore, in order to avoid failure of the gas generating reaction between the getter particles and the formation stage, the sacrificial layer 600 with a melting point greater than 45 ℃ is used to protect the getter particles in the accommodating layer 510, and the getter particles in the isolated pores are exposed to the external environment in the formation stage, so as to prevent the getter particles from reacting with the gas generating reaction in the formation stage, thereby keeping the getter particles effective; after the formation of the energy storage device 10, when the temperature of the energy storage device 10 is greater than the melting temperature of the sacrificial layer 600, the sacrificial layer 600 melts to expose the getter particles in the pores, so that the generated gas is effectively absorbed during the subsequent cycle of the energy storage device 10 during use, and the reliability of the getter particles during the cycle operation of the energy storage device 10 is improved.

The sacrificial layer 600 is an insulating material, does not react with the electrolyte and the positive and negative electrode sheets of the electrode assembly 200, and only plays a role in protecting the getter particles in the formation stage. The sacrificial layer 600 may be, for example, paraffin wax, which has a melting point of 60 ℃, and which maintains a solid phase during the formation stage to avoid the getter particles from reacting with the gas produced during the formation stage; when the temperature of the subsequent energy storage device 10 is higher than 60 ℃, the paraffin is melted to be in a liquid state, and flows into the accommodating space 120 of the shell 100 through the opening 420 after being melted, so that the getter particles in the pores are exposed. Since the paraffin coated on the receiving layer 510 is relatively less, it may be received in a gap between the case 100 and the electrode assembly 200 after melting. Of course, the sacrificial layer 600 may be formed of other materials, for example, wax acid or polyethylene wax, where the melting point of the wax acid and the polyethylene wax is greater than 45 ℃, so as to protect the getter particles in the accommodating layer 510, and the getter particles in the isolated pores are exposed to the external environment in the formation stage, so as to prevent the getter particles from reacting with the gas generated in the formation stage.

In one embodiment of the present application, as shown in fig. 15, the getter 500 has a block structure, and the getter 500 includes a first support layer 521, a second support layer 522, and a getter material layer 523, where the second support layer 522 is disposed opposite to the first support layer 521, and the getter material layer 523 is sandwiched between the first support layer 521 and the second support layer 522. The getter material in the getter material layer 523 can efficiently absorb the generated gas.

The getter material may be getter particles, and the getter material layer 523 is formed by pressing the getter particles. For example, in forming the getter 500 of the laminated structure, a pressing mold may be prefabricated, in which a first supporting layer 521 is first provided, the first supporting layer 521 being for example asbestos; filling getter particles on the first supporting layer 521 in the mold, and pressing the getter particles in the mold after filling the getter particles, so that the getter particles form a dense getter material layer 523 which is not easy to loosen; next, a second supporting layer 522 is disposed on the getter material layer 523, where the second supporting layer 522 may be, for example, asbestos, and the getter material layer 523 is shaped by an upper supporting layer and a lower supporting layer, so as to promote the bonding force of the structure, and avoid the structure from being broken before being filled into the accommodating space 410, so as to be placed on the limit structure 400.

It should be noted that the embodiment above illustrates a getter 500 having a sandwich structure. Of course, the getter 500 may further include more getter material layers 523 and supporting layers to form the getter 500 having a four-layer, five-layer or more structure, which is not limited thereto in this application, as long as the getter effect can be achieved.

Wherein the getter particles are formed of a material such as at least one of activated carbon, carbon nanotubes, alkali metal hydroxide, zirconium vanadium iron ternary alloy, cobalt oxide, copper oxide, potassium permanganate or magnesium oxide. Corresponding getter particles, such as carbon dioxide using activated carbon particles, carbon nanotubes, hydroxide particles of alkali metals, can be prepared for the type of gas generated inside the energy storage device 10; the oxygen uses zirconium vanadium iron ternary alloy particles; the carbon monoxide uses cobalt oxide, copper oxide or potassium permanganate and other particles; the hydrofluoric acid uses the magnesium oxide particles to absorb the generated gas in a targeted manner, so that the air suction capability and the air suction efficiency of the air suction piece 500 are improved.

As shown in fig. 15, the getter 500 has, for example, a rectangular shape, and the getter 500 has a top surface facing the insulating member 320, a bottom surface facing the electrode assembly 200, and four side surfaces between the top surface and the bottom surface. Four sides of the getter material layer 523 are exposed from four sides of the getter 500, so that the generated gas is absorbed by the getter material layer 523 exposed from the four sides. After the gas enters the gas collection chamber, the generated gas can be better absorbed by the relatively large gettering area of the side getter material layer 523.

Of course, the getter 500 may also have a cylindrical shape, a pentagonal prism shape, a hexagonal prism shape, a truncated cone shape, or an irregular shape, i.e., the shapes of the support layer and the getter material layer 523 have a cylindrical shape, a pentagonal prism shape, a hexagonal prism shape, a truncated cone shape, or an irregular shape; the shape and size of the support layer and the getter material layer 523 are the same to better shape the getter material layer 523 by the support layer while increasing the getter material layer 523 in the getter 500 to have a sufficiently large area; of course, the shape of the support layer and the getter material layer 523 may be other shapes such as oval, and the shape and size of the support layer and the getter material layer 523 may be different, which is not limited in this application.

Specifically, as shown in fig. 16, a sacrificial layer 600 is disposed on at least a portion of the surface of the getter material layer 523, and when the sacrificial layer 600 is configured to be greater than a predetermined temperature, the sacrificial layer 600 melts to expose the surface of the getter material layer 523 covered; the sacrificial layer 600 is an insulating material and does not react with the electrolyte in the energy storage device 10, and the preset temperature is 50 ℃ to 60 ℃, for example, 50 ℃, 52 ℃, 55 ℃, 57 ℃, 60 ℃, etc. In a preferred embodiment, the surfaces of getter material layer 523 exposed from getter 500 are all covered by sacrificial layer 600.

Since a large amount of gas is produced from the electrode assembly 200 at the formation stage (about 45 ℃) in the production process of the electrode assembly 200, the sacrificial layer 600 with the melting point higher than 45 ℃ is adopted to protect the getter particles in the accommodating layer 510, and the getter particles in the isolated pores are in the external environment at the formation stage so as to prevent the getter particles from reacting with the gas produced at the formation stage, thereby keeping the getter particles of the getter material layer 523 effective; after the formation of the energy storage device 10, when the temperature of the energy storage device 10 is greater than the melting temperature of the sacrificial layer 600, the sacrificial layer 600 melts to expose the getter particles in the getter material layer 523, so that the generated gas is effectively absorbed during the subsequent cycle of the energy storage device 10 during use, and the reliability of the getter particles during the cycle operation of the energy storage device 10 is improved.

The sacrificial layer 600 is an insulating material, does not react with the electrolyte and the positive and negative plates, and only plays a role in protecting the getter particles in the formation stage. The sacrificial layer 600 may be, for example, paraffin wax, which has a melting point of 60 ℃, and which maintains a solid phase during the formation stage to avoid the getter particles from reacting with the gas produced during the formation stage; when the temperature of the subsequent energy storage device 10 is higher than 60 ℃, the paraffin is melted to be in a liquid state, and flows into the accommodating space 120 of the shell 100 through the opening 420 after being melted, so that the getter particles in the pores are exposed. Since the paraffin coated on the receiving layer 510 is relatively less, it may be received in a gap between the case 100 and the electrode assembly 200 after melting. Of course, the sacrificial layer 600 may be formed of other materials, for example, wax acid or polyethylene wax, where the melting point of the wax acid and the polyethylene wax is greater than 45 ℃, so as to protect the getter particles in the accommodating layer 510, and the getter particles in the isolated pores are exposed to the external environment in the formation stage, so as to prevent the getter particles from reacting with the gas generated in the formation stage.

In one embodiment of the present application, the limiting structure 400 is formed on the insulating member 320, the insulating member 320 may be a lower plastic of the end cap assembly 300, and the limiting structure 400 may be an integral structure formed on the lower plastic, so that the strength of the limiting structure 400 is improved, and meanwhile, the structural strength of the insulating member 320 is also improved.

In one embodiment of the present application, the insulating member 320 is formed with a plurality of limiting structures 400, and the energy storage device 10 includes a plurality of air sucking members 500, where the plurality of air sucking members 500 are disposed in the accommodating spaces 410 of the plurality of limiting structures 400 in a one-to-one correspondence manner. By arranging the plurality of limit structures 400, the getter 500 is arranged in each limit structure 400, so that the space between the end cover assembly 300 and the electrode assembly 200 can be fully utilized to increase the space utilization rate, and the circulation performance and the safety performance of the energy storage device 10 are improved while the energy density of the energy storage device 10 is ensured. Of course, one or more getters 500 may be disposed in the accommodating space 410 of the plurality of limiting structures 400, which is not limited in this application.

As shown in fig. 4, two limiting structures 400 are formed on the insulating member 320, and one getter member 500 is disposed in each of the two limiting structures 400. Because one end of the connecting piece 700 is located on the insulating piece 320, by arranging the two limiting structures 400, the number of the accommodating spaces 410 is increased and the gas absorbing capacity is improved under the condition that the position of the connecting piece 700 on the insulating piece 320 is not influenced.

The embodiment of the application also provides electric equipment which can be energy storage equipment, vehicles, energy storage containers and the like. The electric equipment comprises the energy storage device in the embodiment, and the energy storage device supplies power for the electric equipment. Thus, in combination with the above, the insulating member 320 in the energy storage device 10 of the electric device is provided with the limit structure 400 towards one side of the electrode assembly 200, the limit structure 400 is formed with the accommodating space 410, the air suction member 500 is disposed in the accommodating space 410, and the opening 420 of the limit structure 400 is communicated with the accommodating space 410 and the accommodating space 120, so that the air storage device 10 can be absorbed by the air generated by the decomposition of the electrolyte in the recycling process through the air suction member 500, thereby avoiding poor contact between the positive electrode plate and the negative electrode plate at the gas generating position and the diaphragm, avoiding the integral expansion of the appearance of the lithium precipitation and the electrode assembly 200, further avoiding the deterioration of the cycle life and the multiplying power performance of the energy storage device 10, and ensuring the service performance and the safety performance of the energy storage device 10. Meanwhile, the accommodating space 410 is formed through the limiting structure 400, so that the assembly of the getter 500 on the end cover assembly 300 is facilitated, and the assembly efficiency of the energy storage device 10 is improved. Furthermore, the insulating member 320 seals one side of the limiting structure 400 close to the insulating member 320, that is, the limiting structure 400 is directly formed on the surface of the insulating member 320, and the region of the insulating member 320 corresponding to the limiting structure 400 is not perforated and grooved, so that the structural strength of the insulating member 320 is improved through the limiting structure 400.

In the subject application, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more, unless expressly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the examples of application will be understood by those of ordinary skill in the art as the case may be.

In the description of the application embodiments, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the application embodiments and simplifying the description, and do not indicate or imply that the devices or units to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the application embodiments.

In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an application embodiment. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the application embodiment, and is not intended to limit the application embodiment, and various modifications and changes may be made to the application embodiment by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the application should be included in the protection scope of the embodiments of the application.

Claims

1. An energy storage device, comprising:

a housing (100), the housing (100) forming a receiving space (120) having an open end (110);

an electrode assembly (200), the electrode assembly (200) being disposed in the accommodation space (120);

the end cover assembly (300), wherein the end cover assembly (300) covers the open end (110), the end cover assembly (300) comprises an end cover (310) and an insulating piece (320) which are arranged along a first direction perpendicular to the large surface of the end cover assembly (300), the end cover (310) is provided with an air pressure balancing assembly (330), and the insulating piece (320) is provided with an air permeable structure (340) corresponding to the air pressure balancing assembly (330); a limiting structure (400) is arranged on the surface, facing away from the end cover (310), of the insulating piece (320), and an accommodating space (410) is formed on the limiting structure (400); an orthographic projection of the limiting structure (400) on the insulating piece (320) and the ventilation structure (340) have no overlapping area, an opening (420) facing the electrode assembly (200) is formed on one side of the limiting structure (400) away from the insulating piece (320), the opening (420) is communicated with the accommodating space (410) and the accommodating space (120), and the insulating piece (320) seals one side of the limiting structure (400) close to the insulating piece (320);

And the getter (500) is arranged in the accommodating space (410).

2. The energy storage device according to claim 1, wherein the insulating member (320) is circular, the limiting structure (400) includes a first limiting wall (431) and a second limiting wall (432) which are disposed opposite to each other along a radial direction of the insulating member (320), and a third limiting wall (433) and a fourth limiting wall (434) which are disposed opposite to each other along a circumferential direction of the insulating member (320), and the first limiting wall (431), the second limiting wall (432), the third limiting wall (433) and the fourth limiting wall (434) enclose to form the accommodating space (410); the third limiting wall (433) and the fourth limiting wall (434) are located between the first limiting wall (431) and the second limiting wall (432), and in the circumferential direction, the first limiting wall (431) and the second limiting wall (432) are opposite to the third limiting wall (433) and provided with a first extension part (435) located outside the accommodating space (410), and the first limiting wall (431) and the second limiting wall (432) are opposite to the fourth limiting wall (434) and provided with a second extension part (436) located outside the accommodating space (410).

3. The energy storage device according to claim 2, wherein the first limiting wall (431) is located on a side of the second limiting wall (432) close to the edge of the insulating member (320) along the radial direction, the first limiting wall (431) is arc-shaped, and the arc of the first limiting wall (431) matches the arc of the edge of the insulating member (320).

4. The energy storage device according to claim 2, wherein at least one of the first limiting wall (431), the second limiting wall (432), the third limiting wall (433) and the fourth limiting wall (434) is formed with an air vent (480).

5. The energy storage device according to claim 2, wherein the limiting structure (400) further comprises a limiting member (450), coaxial through holes (440) are formed in the third limiting wall (433) and the fourth limiting wall (434), the limiting member (450) is arranged in the through holes (440) of the third limiting wall (433) and the fourth limiting wall (434) in a penetrating manner, and the air suction member (500) is located between the limiting member (450) and the insulating member (320).

6. The energy storage device according to claim 2, wherein an included angle between an inner side wall of at least one of the first limiting wall (431), the second limiting wall (432), the third limiting wall (433) and the fourth limiting wall (434) and the insulator (320) is an acute angle within the accommodating space (410).

7. The energy storage device of claim 6, wherein the included angle is 45 ° to 60 °.

8. The energy storage device according to claim 1, wherein the limit structure (400) comprises a plurality of limit grids (460) arranged at intervals, a plurality of coaxial mounting holes (470) are respectively formed on the limit grids (460), and the getter (500) is inserted into the plurality of mounting holes (470).

9. The energy storage device according to claim 1, wherein a sacrificial layer (600) is formed on at least part of the surface of the getter (500), the sacrificial layer (600) being configured to melt to expose the surface of the getter (500) being coated when the sacrificial layer (600) is configured to be greater than or equal to a preset temperature; the sacrificial layer (600) is made of an insulating material and does not react with electrolyte in the energy storage device, and the preset temperature is 45-60 ℃.

10. The energy storage device of claim 9, wherein the sacrificial layer (600) is at least one of paraffin wax, cerotic acid, and polyethylene wax.

11. The energy storage device according to claim 1, wherein the getter (500) comprises:

A receiving layer (510), the receiving layer (510) being formed with an aperture extending through a sidewall of the receiving layer (510);

and a getter material filling the pores.

12. The energy storage device according to claim 1, wherein the getter (500) comprises:

a first support layer (521);

a second support layer (522), the second support layer (522) being disposed opposite the first support layer (521);

and a getter material layer (523), wherein the getter material layer (523) is sandwiched between the first support layer (521) and the second support layer (522).

13. The energy storage device according to claim 1, wherein a plurality of said limit structures (400) are provided on a surface of said insulating member (320) facing away from said end cap (310), said energy storage device comprising a plurality of said getter members (500), at least one of said getter members (500) being provided in said receiving space (410) of each of said limit structures (400).

14. An electrical consumer comprising an energy storage device as claimed in any one of claims 1 to 13.