CN116799343A - Energy storage device and electric equipment - Google Patents

Abstract

The application discloses an energy storage device and electric equipment, and relates to the technical field of energy storage. The energy storage device includes: a housing including a receiving chamber having an opening; an electrode assembly accommodated in the accommodation chamber and forming an air-passing gap with an inner wall of the case; the battery top cover comprises a cover plate and an insulating part, the insulating part is positioned between the opening end of the accommodating cavity and the cover plate, the insulating part is provided with a convex part which is opposite to the air passing gap, and the convex part is provided with a limiting hole; the first end of the air suction structure is provided with a limiting structure and is limited in the limiting hole, the second end of the air suction structure is positioned in the air passing gap, the air suction structure is also provided with a cavity and an air passing channel, the air passing channel is communicated with the cavity and the accommodating cavity, and the cavity is filled with getter. In the embodiment of the application, the getter filled in the getter structure absorbs the gas generated by the energy storage device, so that the problem of expansion of the energy storage device is reduced, the problem of poor performance of the energy storage device is reduced, and the safety performance of the energy storage device is improved.

Description

Energy storage device and electric equipment

Technical Field

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

Background

The lithium battery is used as a new energy battery, has the advantages of high energy density, long cycle life, good safety, green and environment protection and the like, and is widely applied. As the demand for lithium batteries increases, the performance requirements of the lithium batteries in all aspects are increasing, especially with respect to cycle performance and safety performance.

In the related art, a lithium battery is generally composed of a battery top cover, an electrode assembly, and a case. The actual production process is to manufacture a battery top cover, an electrode assembly and a shell respectively, then use metal connectors to weld electrode columns of the battery top cover and electrode lugs of the electrode assembly respectively, then put the electrode assembly into the shell, and then use the battery top cover to cover an opening of the shell and then weld and seal the opening so as to form a basic structure of the lithium battery. Then, the electrolyte is injected manually through the electrolyte injection Kong Jiazhu arranged on the top cover of the battery, and the electrolyte injection hole is welded and sealed after the completion.

In the recycling process of the lithium battery, gas is generated due to various reasons such as decomposition of electrolyte, exceeding of moisture in a shell and the like, so that the cycle life and the rate performance are deteriorated; and along with the increase of gas in the shell, too much lithium ions are easily released on the surface of the pole piece of the electrode assembly, dendritic crystals are formed in the long time, and when the dendrites grow to a certain length, the diaphragm is easily pierced, so that short circuit occurs in the lithium battery, and the safety performance is greatly reduced.

Disclosure of Invention

The application aims to provide an energy storage device and electric equipment, which avoid the influence of generated gas on cycle life and multiplying power 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 including a receiving chamber having an opening;

an electrode assembly accommodated in the accommodation chamber and forming an air-passing gap with an inner wall of the case;

the battery top cover comprises a cover plate and an insulating piece, wherein the cover plate covers and seals the opening of the accommodating cavity, the insulating piece is positioned between the opening end of the accommodating cavity and the cover plate, the insulating piece is provided with a convex part which is opposite to the gas passing gap, and the convex part is provided with a limiting hole;

the structure of breathing in, be columnar structure, the first end of structure of breathing in has limit structure, just limit structure is spacing in the spacing downthehole, the second end of structure of breathing in is located in the clearance of wandering away, the structure of breathing in still has cavity and the passageway of wandering away, the passageway of wandering away communicates the cavity with hold the chamber, the cavity intussuseption is filled with the getter, the getter is used for absorbing gas.

In the embodiment of the application, the getter filled in the cavity of the getter structure absorbs the gas generated by the energy storage device, so that the contact effect of the positive plate, the negative plate and the diaphragm of the electrode assembly is ensured, the problem that the energy storage device expands due to the gas generation is reduced, and the problems of the cycle life, the multiplying power performance and the like of the energy storage device are reduced; further, the problem that excessive lithium ions are dissociated on the surface of the pole piece of the electrode assembly due to the accumulated gas in the accommodating cavity, so that the electrode assembly is short-circuited is also reduced, and the safety performance of the energy storage device is improved. In addition, because the spacing hole spacing of air suction structure and insulating part is connected for air suction structure is in the suspension state, has avoided the bottom of air suction structure and the contact of casing bottom like this, and then can effectively reduce the long-term contact electrolyte of the part that the battery top cap was kept away from to the getter of cavity intussuseption and takes place the rotten condition, thereby effectively promote the whole effect of breathing in of getter.

According to one embodiment of the application, the side wall of the first end of the air suction structure is provided with an annular groove, the part between the annular groove and the end face of the first end of the air suction structure, which is close to the groove wall of the cover plate, forms the limit structure, and the wall of the limit hole is provided with a limit surface facing the cover plate;

the groove wall of the annular groove, which is close to the cover plate, is abutted with the limiting surface, and the groove wall of the annular groove, which is far away from the cover plate, is abutted with the surface of the convex part, which is away from the cover plate.

In the embodiment of the application, the annular groove is formed on the side wall of the first end of the air suction structure, so that the groove wall, which is close to the cover plate, on the annular groove and the groove wall, which is far away from the cover plate, are respectively in butt joint with the limiting surface in the limiting hole and the surface, which is far away from the cover plate, of the convex part to limit the position, the stability of hanging the first end of the air suction structure on the insulating part is ensured, and the condition that the air suction structure shakes in the length direction of the air suction structure is avoided.

According to an embodiment of the application, the air passage comprises a plurality of first air holes located on the side wall of the air suction structure.

In the embodiment of the application, the cavity and the accommodating cavity are communicated through the plurality of first air passing holes communicated with the cavity and the air passing gap of the air suction structure, so that the generated gas is absorbed, and the air suction effect is ensured.

According to an embodiment of the present application, the air passage includes a plurality of groups of first air holes, the plurality of groups of first air holes are distributed along a length direction of the air suction structure, and the first air holes included in each group are distributed along a circumferential direction of the air suction structure.

In the embodiment of the application, the contact area between the gas in the gas passing gap and the getter can be increased by arranging the plurality of groups of first gas passing holes, so that the getter effect is improved, and the plurality of groups of first gas passing holes are distributed along the length direction of the getter structure, namely, the plurality of groups of first gas passing holes are distributed along the ascending direction of the gas, so that the getter can effectively absorb the generated gas at different heights in the ascending process of the gas along the gas passing gap, and the getter effect is improved.

According to an embodiment of the application, each set of the first air holes comprises a first air hole with an opening towards the broad side of the housing and a first air hole with an opening towards the long side of the housing.

In the embodiment of the application, the first gas holes are prevented from being blocked by the electrode assembly by setting the orifice orientation of each first gas hole of each group, so that the reliability of the getter filled in the cavity of the getter structure is ensured.

According to an embodiment of the present application, among the two sets of first air holes adjacent in the length direction of the air suction structure, a set of first air holes included close to the battery top cover has a smaller circumferential cross-sectional area than a set of first air holes included far from the battery top cover.

In the embodiment of the application, the battery top cover is upward after the energy storage device is vertically placed, and the gas in the gas passing gap flows towards the battery top cover at the moment, so that the larger the gas concentration is, the larger the minimum circumferential sectional area of the first gas passing hole is, thereby being convenient for the getter to effectively absorb the gas along the first gas passing hole and improving the gas absorbing effect.

According to one embodiment of the application, the first gas passing hole contains a solid-phase inert plugging agent or a liquid-phase inert plugging agent in the containing cavity.

In the embodiment of the application, the inert plugging agent contained in the first gas passing hole can avoid gas generated by the absorption of the getter in the formation stage, and simultaneously ensure the gas generated by the absorption in the charge and discharge stage, thereby improving the reliability of the getter.

According to one embodiment of the application, the melting temperature of the inert blocking agent is more than or equal to 46 ℃ and less than or equal to 58 ℃.

In the embodiment of the application, the melting temperature of the inert plugging agent is limited to ensure that the inert plugging agent in the first gas hole can be in a solid phase in the formation stage of the energy storage device, and in a liquid phase in the charge-discharge stage and flow out of the first gas hole.

According to one embodiment of the application, the hole wall of the first gas vent comprises a bottom plane away from the battery top cover, and one end of the bottom plane away from the cavity is inclined towards a direction away from the battery top cover.

In the embodiment of the application, the slope formed by the bottom plane of the first gas passing hole is convenient for flowing out to the gas passing gap along the bottom plane of the first gas passing hole after the inert plugging agent is melted into a liquid phase and is deposited in the accommodating cavity, so that the influence on the circulation of gas in the gas passing gap is avoided; in addition, when the gas in the gas passing gap rises, the gas is more convenient to be absorbed by the getter filled in the cavity along the first gas passing hole.

According to an embodiment of the present application, the air passage further includes a second air passing hole located at the second end of the air suction structure and penetrating through an end surface of the second end, and the second air passing hole communicates the cavity and the accommodating cavity.

In the embodiment of the application, the second air hole at the second end of the air suction structure can absorb the air from the bottommost part of the accommodating cavity, so that the air is absorbed in all directions, the air suction effect is improved, and the influence caused by the air is reduced.

According to an embodiment of the application, the cross-sectional area of the cavity along a direction perpendicular to the length direction of the getter structure increases in a direction towards the battery top cover.

In the embodiment of the application, in the direction towards the battery top cover, the amount of the getter filled in the cavity is increased, the battery top cover faces upwards after the energy storage device is erected, at the moment, the gas in the gas passing gap flows towards the battery top cover, and at the moment, the gas concentration is higher, and the amount of the getter is increased, so that the effective absorption of the gas by the getter is facilitated, and the gas absorbing effect is ensured.

According to an embodiment of the application, the getter comprises activated carbon particles.

In the embodiment of the application, the area ratio is conveniently improved by the gaps among the active carbon particles and the gaps among the active carbon particles, so that the gas absorption effect is conveniently improved.

According to an aspect of the present application, there is provided an electric device, which includes the energy storage device according to the above aspect, and the energy storage device supplies power to the electric device.

In the embodiment of the application, the energy storage device is combined, and the electric equipment can improve the working stability of the electric equipment and reduce the potential safety hazard of the electric equipment in the working process.

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 as claimed.

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 an exploded structure of an energy storage device according to an exemplary embodiment.

Fig. 2 is a schematic top view of an energy storage device according to an exemplary embodiment.

Fig. 3 is a schematic cross-sectional view of the energy storage device of fig. 2 along line A-A.

Fig. 4 is a partially enlarged schematic structural view of the sectional view shown in fig. 3.

Fig. 5 is a schematic diagram of a front view of an energy storage device according to an exemplary embodiment.

Fig. 6 is a schematic cross-sectional view of an energy storage device shown in fig. 5 along line B-B.

Fig. 7 is a schematic cross-sectional view of another energy storage device along line B-B of fig. 5.

Fig. 8 is an axial side structural schematic diagram of a suction structure according to an exemplary embodiment.

Fig. 9 is a schematic cross-sectional view of a getter structure along the line C-C shown in fig. 8.

Fig. 10 is an enlarged schematic view of the area O1 in the sectional view shown in fig. 6.

Fig. 11 is an enlarged schematic view of the O2 region of the energy storage device shown in fig. 7.

Fig. 12 is an enlarged schematic view of the O3 region of the energy storage device shown in fig. 7.

Fig. 13 is a schematic cross-sectional view of another suction structure along the line C-C shown in fig. 8.

Fig. 14 is a schematic cross-sectional view of still another suction structure along the line C-C shown in fig. 8.

Wherein reference numerals are as follows:

100. an energy storage device;

10. a housing; 20. an electrode assembly; 30. a getter structure; 40. a battery top cover;

11. a receiving chamber; 12. an opening;

21. an R angle region; 22. an air-passing gap;

31. a cavity; 32. a limit structure; 33. an annular groove; 34. an injection hole;

321. a first air hole; 322. a second air hole; 323. a first diversion trench; 324. a second diversion trench; 325. a bottom plane;

41. a cover plate; 42. an insulating member; 43. a convex portion; 431. and a limiting hole.

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.

Embodiments of the present application provide an energy storage device 100, where the energy storage device 100 may be, but is not limited to, a single battery, a battery module, a battery pack, a battery system, etc. The single battery can be a lithium ion secondary battery, a lithium sulfur battery, a sodium-lithium ion battery, a sodium ion battery, a magnesium ion battery and the like, and the single battery can be a cylinder, a square body and the like.

Next, the energy storage device 100 is taken as an example of a single battery, and the energy storage device 100 will be explained in detail.

Fig. 1 illustrates a schematic structure of an energy storage device 100 according to an embodiment of the present application. As shown in fig. 1, the energy storage device 100 includes a case 10, an electrode assembly 20, and a battery top cover 40, the case 10 including a receiving chamber 11 having an opening 12; the electrode assembly 20 is accommodated in the accommodating chamber; the battery top cover 40 covers the case and seals the opening 12 of the accommodating chamber 11.

Wherein, the housing 10 may have a cylindrical structure (a cylindrical structure or a square cylindrical structure) with one end opened, and the energy storage device 100 includes a battery top cover 40 to be capable of sealing one opening 12 of the housing 10; of course, the housing 10 may have a cylindrical structure with two open ends, and the energy storage device 100 may include one battery top cover 40 and one end cover, or include two battery top covers 40, so that the two openings 12 of the housing 10 can be sealed respectively.

Wherein, battery top cap 40 includes apron 41 and insulating part 42, and apron 41 lid closes and seals the opening 12 that holds chamber 11, and insulating part 42 is located between the open end that holds chamber 11 and apron 41, so with the setting through insulating part 42 realizes the insulation between electrode assembly 20 and the apron 41, guarantees the security of energy storage device 100 use.

The cover 41 is provided with an electrode terminal (one electrode terminal, or two electrode terminals (positive electrode terminal and negative electrode terminal)), which is disposed on the cover 41 and the insulating member 42 in a penetrating manner, and one end of the electrode terminal is connected to the electrode assembly 20, and the other end of the electrode terminal is exposed outside the casing 10, so as to serve as an output end of the energy storage device 100. The cover plate 41 is further provided with an explosion-proof valve and/or a liquid injection hole, the explosion-proof valve is used for discharging the gas in the accommodating cavity 11 to improve the use safety of the energy storage device 100, and the liquid injection hole is used for injecting the electrolyte into the accommodating cavity 11 of the energy storage device 100.

The electrode assembly 20 includes a positive plate, a negative plate, and a separator, where the separator is located between the positive plate and the negative plate, and the ends of the positive plate and the negative plate have tabs to form positive tabs and negative tabs of the energy storage device 100. The positive electrode tab and the negative electrode tab may be located at the same end of the electrode assembly 20 or may be located at different ends of the electrode assembly 20, and when the positive electrode tab and the negative electrode tab are located at the same end of the electrode assembly 20, the positive electrode tab and the negative electrode tab are respectively connected with a positive electrode terminal and a negative electrode terminal included in the battery top cover 40, so as to realize output of electric energy of the electrode assembly 20 through the positive electrode terminal and the negative electrode terminal; when the positive electrode tab and the negative electrode tab are positioned at both ends of the electrode assembly 20, one of the positive electrode tab and the negative electrode tab is connected with an electrode terminal included in the battery top cover 40, and the other is connected with the bottom of the case 10 or an electrode terminal included in another battery top cover 40 to achieve output of electric power of the electrode assembly 20 through the electrode terminal of the battery top cover 40 and the bottom of the case 10 or through the electrode terminals of both battery top covers 40.

It should be noted that, the energy storage device 100 further includes a connecting member, and the connection between the tab of the electrode assembly 20 and the electrode terminal of the battery top cover 40 can be achieved through the connecting member, so as to ensure the stability of the connection between the electrode assembly 20 and the electrode terminal.

During use of the energy storage device 100, gas is inevitably generated due to various reasons, such as decomposition of electrolyte, excessive moisture in the case 10, etc., resulting in deterioration of cycle life and rate performance of the battery. In order to avoid the generated gas from damaging the energy storage device 100, as shown in fig. 1, 2 and 3, the energy storage device 100 further includes a gas suction structure 30 in addition to the above-mentioned case 10, electrode assembly 20 and battery top cover 40, the electrode assembly 20 and the inner wall of the case 10 form a gas passing gap 22, the insulating member 42 has a protrusion 43 facing the gas passing gap 22, and the protrusion 43 has a limiting hole 431; the air suction structure 30 is in a columnar structure, a first end of the air suction structure 30 is provided with a limiting structure 32, the limiting structure 32 is limited in a limiting hole 431, a second end of the air suction structure 30 is located in the air passing gap 22, the air suction structure 30 is further provided with a cavity 31 and an air passing channel (not shown in the figure), the air passing channel is communicated with the cavity 31 and the accommodating cavity 11, and the cavity 31 is filled with a getter (not shown in the figure) which is used for absorbing gas.

In this way, the getter filled in the cavity 31 of the getter structure 30 absorbs the gas generated by the energy storage device 100, so that the contact effect of the positive plate, the negative plate and the diaphragm of the electrode assembly 20 is ensured, the problem that the energy storage device 100 expands due to the gas generation is reduced, and the problems that the cycle life, the multiplying power performance and the like of the energy storage device 100 are reduced; further, the problem of short-circuiting of the electrode assembly 20 caused by excessive lithium ions released from the surface of the electrode sheet of the electrode assembly 20 due to the gas accumulated in the accommodating chamber 11 is also reduced, and the safety performance of the energy storage device 100 is improved. In addition, because the air suction structure 30 is in spacing connection with the spacing hole 431 of the insulating member 42, the air suction structure 30 is in a hanging state, so that the contact between the bottom of the air suction structure 30 and the bottom of the shell 10 is avoided, and further, the condition that the part, far away from the battery top cover 40, of the getter filled in the cavity 31 is in long-term contact with electrolyte to deteriorate can be effectively reduced, and the overall air suction effect of the getter is effectively improved.

As shown in fig. 4, the first end of the getter structure 30 has an injection hole 34 penetrating the end surface of the first end and communicating with the cavity 31, so as to facilitate filling the cavity 31 of the getter structure 30 with the getter along the injection hole 34.

In addition, as for the limit structure 32 at the first end of the air suction structure 30, as shown in fig. 4, the side wall of the first end of the air suction structure 30 is provided with an annular groove 33, a part between the annular groove 33 and the end face of the first end of the air suction structure 30, which is close to the groove wall of the cover plate 41, forms the limit structure 32, and the wall of the limit hole 431 has a limit surface facing the cover plate 41; the groove wall of the annular groove 33 near the cover plate 41 is abutted against the limit surface of the limit hole 431, and the groove wall of the annular groove 33 far from the cover plate 41 is abutted against the surface of the convex part 43 away from the cover plate 41.

In this way, the annular groove 33 is formed on the side wall of the first end of the air suction structure 30, so that the groove wall, which is close to the cover plate 41, on the annular groove 33, and the groove wall, which is far away from the cover plate 41, are respectively limited by the limiting surface in the limiting hole 431 and the abutting connection of the surface, which is far away from the cover plate 41, of the convex part 43, so that the stability of hanging the first end of the air suction structure 30 on the insulating part 42 is ensured, and the condition that the air suction structure 30 shakes in the length direction of the air suction structure 30 is avoided.

Of course, in the embodiment of the present application, a portion of the sidewall of the air intake structure 30 near the end face of the first end may be provided with a structure extending in the radial direction to form the limit structure 32 (in this case, the limit structure 32 may be an annular structure or may be a plurality of protrusions distributed at intervals along the circumferential direction of the air intake structure 30), which is not limited in the embodiment of the present application.

When the limiting structure 32 is a structure extending in the radial direction, in order to avoid the shake of the air suction structure 30 in the length direction thereof, and ensure the suspension stability of the first end of the air suction structure 30 on the insulating member 42, it may be that the end surface of the first end of the air suction structure 30 abuts against the surface of the cover plate 41 facing the insulating member 42.

The getter may be in a granular structure, and during the charge and discharge of the energy storage device 100, most of the gas generated by the side reaction of the electrolyte is carbon dioxide, and in order to avoid the side reaction of the getter with the electrolyte in the energy storage device 100, the getter may optionally include activated carbon particles. In this manner, absorption of produced gas may be achieved by the activated carbon particles while avoiding the negative impact of the activated carbon particles on the energy storage device 100.

In addition, the gas generated by the side reaction of the electrolyte further comprises saturated hydrocarbon and unsaturated hydrocarbon gas, and at this time, the activated carbon particles with large surface area can also remove the saturated hydrocarbon and the unsaturated hydrocarbon gas, so as to realize the maximum absorption of the gas and further reduce the influence caused by the gas generated by the energy storage device 100.

Of course, in addition to the activated carbon particles for absorbing carbon dioxide gas, the alkali metal and/or alkaline earth metal hydroxide particles may be used simultaneously to absorb carbon dioxide, in which case, in order to avoid side reactions between the alkali metal and/or alkaline earth metal hydroxide particles and the electrolyte in the energy storage device 100, the alkali metal and/or alkaline earth metal hydroxide particles may be coated with the activated carbon particles, in which case the electrolyte cannot penetrate the protective layer formed by the activated carbon particles due to its viscosity, and the gas generated by the energy storage device 100 may be smoothly absorbed by the alkali metal and/or alkaline earth metal hydroxide particles through the gaps between the activated carbon particles, thereby improving the getter effect of the getter.

In the embodiment of the present application, as shown in fig. 5 and 6, or fig. 5 and 7, for the square body of the energy storage device 100, the electrode assembly 20 has the R-angle region 21, and the R-angle region 21 of the electrode assembly 20 forms a large gas passing gap 22 with the inner wall of the case 10. In this way, the protrusion 43 opposite to the R-angle region 21 of the electrode assembly 20 and the inner wall of the case 10 may be disposed on the insulating member 42 to form a larger air gap 22, so as to ensure that the second end of the air suction structure 30 can extend into the R-angle region 21 of the electrode assembly 20 and form a larger air gap 22 with the inner wall of the case 10 after the first end of the air suction structure 30 of the columnar structure is in spacing connection with the limiting hole 431 on the protrusion 43.

In addition, two electrode assemblies 20 are typically disposed in the housing 10 of the square-shaped energy storage device 100 to form six R-corner regions 21, and the six R-corner regions 21 and the inner wall of the housing 10 form six air gaps 22. Thus, the insulating member 42 is provided with six protrusions 43 facing the six air gaps 22, the six protrusions 43 may be divided into two groups, and three protrusions 43 of each group are of an integral structure; and the suction structure 30 is suspended from at least one of the six protrusions 43. Illustratively, as shown in fig. 6 or 7, each of the six air gaps 22 is provided with an air suction structure 30 extending into the corresponding air gap 22 to enhance the air suction effect by more air suction structures 30.

Wherein, the air suction structure 30 has a columnar structure so that one end far away from the insulating member 42 can extend into the air passing gap 22 between the R-angle area 21 of the electrode assembly 20 and the inner wall of the casing 10 after being hung on the insulating member 42; meanwhile, for the air suction structure 30 with a columnar structure, the air generated by the energy storage device 100 can rise along the air passing gap 22, so that the contact time between the air and the getter in the cavity 31 can be prolonged, and the air suction effect can be improved.

For the cavity 31 that the getter structure 30 has, in some embodiments, as shown in fig. 3, the cross-sectional area of the cavity 31 along a direction perpendicular to the length direction of the getter structure 30 increases in a direction X toward the battery top cover 40. In this way, in the direction X toward the battery top cover 40, the amount of the getter filled in the cavity 31 will be more and more, and after the energy storage device 100 is erected, the battery top cover 40 faces upward, and the gas in the gas passing gap 22 will flow toward the battery top cover 40, and at this time, the area with a larger gas concentration will have a larger amount of the getter, so that the effective absorption of the gas by the getter is facilitated, and the gettering effect is ensured.

Alternatively, the cavity 31 may have an inverted frustoconical configuration or an inverted conical configuration (all defined with the battery top cover 40 facing upward when the energy storage device 100 is erected). Compared with the cavity 31 with the conical structure, the cavity 31 with the conical structure can be filled with a larger amount of getter, so that the absorbable amount of gas can be increased, and the service life of the energy storage device 100 can be prolonged.

Of course, in the embodiment of the present application, the cavity 31 of the air suction structure 30 may have a structure other than an inverted truncated cone structure or an inverted cone structure, such as a pyramid structure or a pyramid structure.

In the embodiment of the present application, for the energy storage device 100, from the manufacturing to the use, gas is generated in the formation stage, and gas is generated in the charging and discharging process, and for the gas generated in the formation stage, the corresponding suction device is generally used to suck along the liquid injection hole, so that only the gas generated in the charging and discharging process can affect the performance of the energy storage device 100.

While in the formation stage the getter structure 30 has been fitted in the gas-passing gap 22 between the electrode assembly 20 and the inner wall of the housing 10, in order to avoid that the getter filled in the cavity 31 of the getter structure 30 absorbs the generated gas in the formation stage, in some embodiments, the gas-passing channel contains an inert plugging agent in solid phase or in liquid phase in the chamber 11.

Optionally, the melting temperature of the inert blocking agent is greater than or equal to 46 ℃ and less than or equal to 58 ℃. For example, the inert blocking agent may have a melting temperature of 46 degrees celsius, 50 degrees celsius, 54 degrees celsius, 58 degrees celsius.

Because the temperature of the energy storage device 100 in the formation stage is approximately 45 ℃ (less than 46 ℃), the inert plugging agent contained in the gas passage is in a solid phase at the moment, so that the gas passage is plugged, and the gas generated in the formation stage is prevented from being absorbed by the getter; the temperature of the energy storage device 100 during charging and discharging is approximately 60 degrees celsius (greater than 58 degrees celsius), at this time, the inert plugging agent contained in the gas passage is melted into a liquid phase, flows out of the gas passage and is deposited at the bottom of the containing cavity 11, so that the gas generated during charging and discharging can be absorbed by the getter along the gas passage. Therefore, the inert plugging agent can plug the gas flowing channel in the formation stage so as to avoid gas generated by the absorption of the getter, and simultaneously melt in the charge-discharge stage and flow out of the gas flowing channel so as to absorb the generated gas, thereby improving the reliability of the getter.

In the charge-discharge stage of the energy storage device 100, the inert blocking agent may not undergo side reactions with the electrolyte, water, etc. in the energy storage device 100, so as to avoid other negative effects of the inert blocking agent on the energy storage device 100. By way of example, the inert blocking agent may be paraffin wax, wax acid, polyethylene wax or other inert phase change material, or the like. In the case of the inert blocking agent in a solid phase, which is blocked in the gas passage, the following detailed explanation will be given specifically with reference to the specific structure of the gas passage.

In some embodiments, as shown in fig. 8 or 9, the air passage includes a plurality of first air passing holes 321 located at a sidewall of the air suction structure 30. In this way, the plurality of first air holes 321 are communicated with the cavity 31 of the air suction structure 30 and the air gap 22, so that the cavity 31 is communicated with the accommodating cavity 11, and the air generated by the energy storage device 100 can be absorbed by the getter filled in the cavity 31.

Alternatively, as shown in fig. 8 or 9, the air passage includes a plurality of groups of first air holes 321, the plurality of groups of first air holes 321 are distributed along the length direction of the air suction structure 30, and the first air holes 321 included in each group are distributed along the circumferential direction of the air suction structure 30. In this way, through the arrangement of the plurality of groups of first air holes 321, the contact area between the gas in the air passing gap 22 and the getter can be increased, so that the gettering effect is improved, and because the plurality of groups of first air holes 321 are distributed along the length direction of the gettering structure 30, namely the plurality of groups of first air holes 321 are distributed along the ascending direction of the gas, the getter can effectively absorb the gas generated by the energy storage device 100 at different heights in the ascending process of the gas along the air passing gap 22, so that the gettering effect is improved.

The number of the first air holes 321 in each group may be one or a plurality (such as two) as shown in fig. 8. When the number of the first air holes 321 of each group is plural, the air in the air gap 22 can be absorbed from a plurality of directions through the plurality of the first air holes 321 of each group, thereby improving the air suction effect.

Alternatively, when the number of the first air holes 321 of each group is one, the apertures of the first air holes 321 of each group are each directed toward the wide side W of the housing 10, or are each directed toward the long side L of the housing 10, for example, as shown in fig. 10, the apertures of one first air hole 321 of each group are each directed toward the wide side W of the housing 10. When the number of the first air holes 321 of each group is two, as shown in fig. 11, the apertures of the two first air holes 321 of each group are directed toward the wide side W of the housing 10 and the long side L of the housing 10, respectively, i.e., the two first air holes 321 of each group include the first air holes 321 of the apertures directed toward the wide side of the housing 10 and the first air holes 321 of the apertures directed toward the long side of the housing 10. The orientation of the orifice of the first gas passing hole 321 is set in this way, so that the first gas passing hole 321 is prevented from being blocked by the electrode assembly 20, thereby ensuring the reliability of the getter filled in the cavity 31 of the getter structure 30.

It should be noted that, in the case where the number of the first air holes 321 of each group is two, when the air intake structure 30 is located in the air passing gap 22 between the R corner regions 21 of the two electrode assemblies 20, as shown in fig. 12, the openings of the two first air holes 321 of each group are all oriented toward the long side L of the case 10; of course, the openings of the two first air holes 321 of each group face the wide side W of the housing 10, which is not limited by the embodiment of the present application. Further, the number of the first air passing holes 321 of each group of the air sucking structure 30 positioned in the air passing gap 22 between the R-angle areas 21 of the two electrode assemblies 20 may be three, and at this time, the openings of the two first air passing holes 321 of each group face the long side L of the case 10, and the opening of one first air passing hole 321 faces the wide side W of the case 10.

Alternatively, among the two adjacent sets of first air holes 321 in the length direction of the air suction structure 30, the smallest circumferential sectional area of the first air holes 321 included in the set close to the battery top cover 40 is larger than the smallest circumferential sectional area of the first air holes 321 included in the set far from the battery top cover 40. Because the battery top cover 40 is upward after the energy storage device 100 is vertically placed, the gas in the gas passing gap 22 also flows towards the battery top cover 40 at this time, so that the larger the gas concentration is, the larger the minimum circumferential sectional area of the first gas passing hole 321 is, thereby facilitating the effective absorption of the gas by the getter along the first gas passing hole 321 and improving the gettering effect.

In other embodiments, as shown in fig. 9, the air passage further includes a second air vent 322 located at the second end of the air suction structure 30 and penetrating the end surface of the second end, and the second air vent 322 communicates with the cavity 31 and the accommodating cavity 11. In this way, for the second gas outlet hole 322 located at the second end of the gas suction structure 30, the gas can be absorbed from the bottommost portion of the energy storage device 100, so as to improve the gas suction effect and reduce the influence of the gas on the energy storage device 100.

Alternatively, in the case that the second end of the getter structure 30 has the second air vent 322, in order to avoid the getter leaking along the second air vent 322, the cavity 31 of the getter structure 30 may be provided in an inverted truncated cone structure. In this way, the cavity 31 has the smallest cross-sectional area along the direction perpendicular to the length direction of the getter structure 30 at the end portion communicating with the second air vent 322, so that the getter has better compression at the end portion of the cavity 31 communicating with the second air vent 322, thereby reducing the leakage of the getter.

In addition to the first air holes 321 provided on the side wall of the air intake structure 30 or the second air holes 322 provided on the end of the second end of the air intake structure 30, as shown in fig. 9, the first air holes 321 may be provided on the side wall of the air intake structure 30 and the second air holes 322 may be provided on the second end of the air intake structure 30, which is not limited in the embodiment of the present application.

In the embodiment of the present application, in combination with the above-described case where the gas passage contains the inert plugging agent of the solid phase, when the gas passage includes 32 the first gas passage holes 321, the inert plugging agent of the solid phase is contained in the first gas passage holes 321; when the gas passage comprises a second gas vent 322, the second gas vent 322 contains an inert plugging agent in a solid phase; when the gas passage includes the first gas hole 321 and the second gas hole 322, the first gas hole 321 and the second gas hole 322 both contain the inert plugging agent of the solid phase.

In order to avoid the solid inert plugging agent from sliding out of the first gas hole 321 when the solid inert plugging agent is contained in the first gas hole 321, optionally, the hole wall of the first gas hole 321 has a certain roughness, so as to increase the friction between the solid inert plugging agent and the hole wall of the first gas hole 321, and avoid the solid inert plugging agent from sliding out. Illustratively, the walls of the first air holes 321 are formed with protruding structures.

Of course, besides the roughness of the hole wall of the first air hole 321, the circumferential cross-sectional area of the first air hole 321 may be increased in the direction close to the cavity 31, so as to limit the solid inert plugging agent in the first air hole 321, and avoid the situation that the solid inert plugging agent slides out from the first air hole 321.

In order to ensure that the inert plugging agent can flow out of the first gas-releasing hole 321 after being melted into the liquid phase, taking an example that the circumferential cross-sectional area of the first gas-releasing hole 321 increases in a direction approaching the cavity 31, in some embodiments, as shown in fig. 13, the hole wall of the first gas-releasing hole 321 includes a bottom plane 325 away from the battery top cover 40, and one end of the bottom plane 325 away from the cavity 31 is inclined in a direction Y away from the battery top cover 40. Thus, the slope formed by the bottom plane 325 of the first gas-passing hole 321 is convenient for flowing out to the gas-passing gap 22 along the bottom plane 325 of the first gas-passing hole 321 after the inert plugging agent is melted into liquid phase, and is deposited at the bottom of the containing cavity 11, so that the influence on the circulation of gas in the gas-passing gap 22 is avoided; in addition, when the gas in the gas passing gap 22 rises, the gas can conveniently enter the cavity 31 along the bottom plane 325 of the first gas passing hole 321 and be absorbed by the getter in the cavity 31. Illustratively, as shown in fig. 13, the included angle R between the bottom plane 325 of the first air hole 321 and the direction X of the center line O of the cavity 31 toward the battery top cover 40 is 95 degrees, 105 degrees, 115 degrees, or the like.

In other embodiments, as shown in fig. 14, the air suction structure 30 has a first diversion trench 323 corresponding to the first air hole 321, and the first diversion trench 323 is located at one side of the corresponding first air hole 321 facing away from the direction Y of the battery top cover 40, and communicates with the large aperture end of the first air hole 321 and the air gap 22. Thus, the inert plugging agent flows to the large-aperture end of the first gas outlet 321 after being melted into a liquid phase, flows out to the gas outlet gap 22 along the first diversion trench 323, and is deposited at the bottom of the accommodating cavity 11, so that the influence on the circulation of gas in the gas outlet gap 22 is avoided; in addition, after the liquid-phase inert plugging agent flows out along the first diversion trench 323, the first diversion trench 323 can also form a gas passing channel, so that the gas suction effect is improved.

Wherein, the distance between one end of the first diversion trench 323, which is communicated with the first air hole 321, and the battery top cover 40 is relatively close, and the distance between one end, which is communicated with the air gap 22, and the battery top cover 40 is relatively far, so as to ensure that the liquid-phase inert plugging agent can smoothly flow out from the first diversion trench 323. Optionally, as shown in fig. 14, the first diversion trench 323 has a linear structure, so as to shorten the length of the first diversion trench 323, and ensure that the inert plugging agent in the liquid phase can quickly flow out to the air gap 22.

The distance between the end of the first flow guiding groove 323 and the battery top cover 40 may be specifically described with reference to the above embodiment, that is, in the case that the energy storage device 100 includes one battery top cover 40, the distance between the end of the first flow guiding groove 323 and the battery top cover 40 may be directly determined; for the case where the energy storage device 100 includes two cell top covers 40, the distance between the end of the first guide groove 323 and the cell top cover 40 provided with the explosion-proof valve may be determined.

In the case where the second gas-vent holes 322 contain the inert plugging agent in a solid phase, the end face of the second gas-vent holes 322 at the second end of the gas-suction structure 30 is communicated with the containing cavity 11, so that the inert plugging agent can flow into the containing cavity 11 directly after being melted into a liquid phase.

The cross-sectional area of the second air vent 322 along the direction perpendicular to the length direction of the air suction structure 30 gradually increases in the direction approaching the cover 41, so as to avoid leakage of the solid inert plugging agent contained in the second air vent 322 from the second air vent 322. The second air hole 322 may be an inverted truncated cone structure or an inverted truncated pyramid structure, which is not limited in the embodiment of the present application.

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 100 in the embodiment, and the energy storage device 100 supplies power for the electric equipment. Thus, in combination with the energy storage device 100, the electric equipment provided by the application can improve the working stability of the electric equipment and reduce the potential safety hazard of the electric equipment in the working process.

In the examples of the 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 (13)

1. An energy storage device, comprising:

a housing (10) comprising a receiving chamber (11) having an opening (12);

an electrode assembly (20) which is accommodated in the accommodating chamber (11) and forms an air-passing gap (22) with the inner wall of the housing (10);

a battery top cover (40) including a cover plate (41) and an insulating member (42), the cover plate (41) covering and sealing an opening (12) of the accommodation chamber (11), the insulating member (42) being located between an open end of the accommodation chamber (11) and the cover plate (41), and the insulating member (42) having a convex portion (43) facing the air-passing gap (22), the convex portion (43) having a limiting hole (431);

the structure (30) breathes in, is columnar structure, the first end of structure (30) breathes in has limit structure (32), just limit structure (32) are spacing in spacing hole (431), the second end of structure (30) breathes in is located in gas clearance (22), structure (30) breathes in still has cavity (31) and gas passageway of wandering, gas passageway intercommunication cavity (31) with hold chamber (11), the intussuseption of cavity (31) is filled with the getter, the getter is used for absorbing gas.

2. Energy storage device according to claim 1, characterized in that the side wall of the first end of the suction structure (30) is provided with an annular groove (33), the portion of the annular groove (33) between the wall of the cover plate (41) adjacent to the end face of the first end of the suction structure (30) and the end face of the suction structure (30) forming the limit structure (32), the wall of the limit hole (431) having a limit face facing the cover plate (41);

the groove wall of the annular groove (33) close to the cover plate (41) is abutted with the limiting surface, and the groove wall of the annular groove (33) far away from the cover plate (41) is abutted with the surface of the convex part (43) far away from the cover plate (41).

3. The energy storage device according to claim 1, wherein the air passage comprises a plurality of first air passage holes (321) located in a side wall of the air suction structure (30).

4. A device according to claim 3, wherein the air passage comprises a plurality of groups of first air holes (321), the plurality of groups of first air holes (321) being distributed along the length of the air suction structure (30), and the first air holes (321) comprised by each group being distributed along the circumference of the air suction structure (30).

5. The energy storage device according to claim 4, wherein each set of the first gas holes (321) comprises a first gas hole (321) with an opening towards the broad side of the housing (10) and a first gas hole (321) with an opening towards the long side of the housing (10).

6. The energy storage device according to claim 4, wherein, of the two sets of first air passing holes (321) adjacent in the length direction of the air suction structure (30), a set of first air passing holes (321) included close to the battery top cover (40) has a smaller circumferential cross-sectional area than a set of first air passing holes (321) included far from the battery top cover (40).

7. An energy storage device according to claim 3, characterized in that the first gas-passing hole (321) contains a solid phase of inert plugging agent or a liquid phase of inert plugging agent in the receiving chamber (11).

8. The energy storage device of claim 7, wherein the inert blocking agent has a melting temperature greater than or equal to 46 degrees celsius and less than or equal to 58 degrees celsius.

9. The energy storage device according to claim 7, wherein the wall of the first air vent (321) comprises a bottom plane (325) remote from the battery top cover (40), the end of the bottom plane (325) facing away from the cavity (31) being inclined in a direction facing away from the battery top cover (40).

10. The energy storage device according to any of the claims 1-9, wherein the air passage further comprises a second air passage hole (322) located at the second end of the air suction structure (30) and penetrating the end surface of the second end, and the second air passage hole (322) communicates the cavity (31) with the receiving cavity (11).

11. Energy storage device according to any of claims 1-9, wherein the cross-sectional area of the cavity (31) along a direction perpendicular to the length direction of the getter structure (30) increases in a direction towards the battery top cover (40).

12. An energy storage device as defined in any of claims 1-9, wherein said getter comprises activated carbon particles.

13. An electrical device, characterized in that it comprises an energy storage device according to any of the preceding claims 1-12, said energy storage device powering said electrical device.