CN117525728A

CN117525728A - Energy storage device and electric equipment

Info

Publication number: CN117525728A
Application number: CN202410011571.9A
Authority: CN
Inventors: 李茂松; 李鹏钊
Original assignee: Shenzhen Haichen Energy Storage Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Shenzhen Haichen Energy Storage Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2024-01-04
Filing date: 2024-01-04
Publication date: 2024-02-06
Anticipated expiration: 2044-01-04
Also published as: CN117525728B

Abstract

The application discloses energy storage device and consumer, energy storage device include casing subassembly and electrode assembly, and casing subassembly includes shell and collet piece. The housing is provided with a receiving cavity with an opening at one side. The shoe includes a shoe plate, a first leg, and a second leg. The bottom bracket plate includes a first surface and a second surface. The first support leg and the second support leg are both arranged on the first surface in a protruding mode. The backing plate is the elastic component, and the backing plate includes first buffer portion, and first buffer portion includes protruding section and sunk section, and the thickness of protruding section is greater than the thickness of sunk section. The collet sets up in holding the intracavity, and first surface orientation chamber bottom surface, first stabilizer blade and second stabilizer blade all butt chamber bottom surface have the interval along housing assembly's direction of height between first surface and the chamber bottom surface, and the interval forms the cushion chamber. The electrode assembly is disposed in the accommodating chamber, and a bottom of the electrode assembly contacts the second surface. The energy storage device has longer service life.

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 existing energy storage device generally comprises a shell component, wherein the shell component is provided with a containing cavity, an electrode component is arranged in the containing cavity, a gap is reserved between the bottom surface of the electrode component and the bottom wall of the inner side of the shell, and the electrode component cannot be completely attached. Because the energy storage equipment can rock or receive outside impact in the use, the electrode assembly can rock and take place the striking in holding the intracavity, leads to electrode assembly damage, and energy storage device's life-span shortens.

Disclosure of Invention

An object of the application is to provide an energy memory and consumer, electrode assembly can cushion through the collet piece, and the life of product is longer.

A first aspect of the present application provides an energy storage device comprising a housing assembly and an electrode assembly, the housing assembly comprising a housing and a shoe. The housing is provided with a receiving cavity with an opening at one side. The receiving cavity has a cavity floor opposite the opening. The shoe includes a shoe plate, a first leg, and a second leg. The bottom pallet comprises a first surface and a second surface; the first surface and the second surface are arranged opposite to each other along the thickness direction of the bottom plate. The first support leg and the second support leg are both arranged on the first surface in a protruding mode, and the first support leg and the second support leg are located at two opposite side edges of the first surface along the width direction of the bottom supporting plate. The bottom supporting plate is an elastic piece and comprises a first buffer part, and the first buffer part is positioned between the first support leg and the second support leg; the first buffer part comprises a convex section and a concave section, and the convex section is connected with the concave section along the width direction of the bottom supporting plate; along the thickness direction of the bottom supporting plate, the thickness of the convex section is larger than that of the concave section. The collet sets up in holding the intracavity, and first surface orientation chamber bottom surface, first stabilizer blade and second stabilizer blade all butt chamber bottom surface have the interval along housing assembly's direction of height between first surface and the chamber bottom surface, and the interval forms the cushion chamber. The electrode assembly is disposed in the accommodating chamber, and a bottom of the electrode assembly contacts the second surface.

When energy storage equipment rocks or outside receives the impact, electrode assembly rocks in holding the intracavity, electrode assembly's bottom butt collet, gives the collet with impact force transmission, and the collet has elasticity, and the collet is thinner relatively at the thickness of sunk section. After receiving the impact force, the bottom support plate can elastically deform in the buffer cavity to buffer the electrode assembly, so that the electrode assembly is prevented from being damaged due to external impact, and the service life of the product is prolonged.

In addition, the bottom support plate is further provided with a protruding section, the thickness of the protruding section is thicker, and the structural strength of the first buffer part can be enhanced, so that the electrode assembly is supported by the bottom support plate with better strength.

In some embodiments, the receiving cavity further comprises a cavity side surface connected to the cavity bottom surface with a gap between the cavity side surface and the outer periphery of the bottom plate in a direction perpendicular to the first surface.

After the electrode assembly is mounted in the accommodating cavity, electrolyte is injected into the accommodating cavity, and the electrolyte flows into the buffer cavity along the gap. That is, the electrolyte is contained in the buffer cavity, the electrolyte plays a role of a water bed, when the electrode assembly shakes to impact the bottom plate, the electrolyte in the buffer cavity can further slow down the impact force of the electrode assembly, so that the electrode assembly can be better buffered when shaking, the electrode assembly cannot be easily damaged, and the service life of the energy storage device is prolonged.

In some embodiments, the raised sections are formed such that the second surface is raised away from the first surface.

When the energy storage device is subjected to external impact, the electrode assembly swings downwards, and the electrode assembly transmits the impact force to the protruding section. The impact force is concentrated in the protruding section entirely, and when the bottom support plate received electrode assembly to strike, the bottom support plate takes place elastic deformation towards the cushion chamber more easily in protruding section and the position of sunk section for the bottom support plate is better to electrode assembly's cushioning properties, and then energy memory's life-span is better.

In some embodiments, the boss has a reference axis, a first edge and a second edge along a thickness direction of the base plate, the reference axis being a central axis of the boss in a width direction, the first edge and the second edge being opposite side edges of the boss in the width direction. The distance from the first edge to the reference axis from the second surface to the first surface increases gradually, and the thickness of the convex section increases gradually. From the reference axis to the second edge, the distance from the second surface to the first surface gradually decreases, and the thickness of the convex section gradually decreases.

The protruding section is two, and two protruding sections are first protruding section and second protruding section respectively. The first protruding section and the second protruding section are respectively connected with two opposite sides of the recessed section along the width direction.

It can be understood that the protruding section is convex, and the arc surface on the protruding section and the second surface transition gradually, and the bottom plate ductility is better at elastic deformation's in-process, and the resilience force that produces is bigger for the buffer to electrode assembly is better, can carry out better protection to electrode assembly, and then has improved energy storage device's life.

In addition, through setting up first protruding section and the protruding section support electrode assembly of second, on the one hand, electrode assembly has two strong points for electrode assembly's stability is higher.

In another aspect, the first and second protruding sections support the electrode assembly. When the electrode assembly shakes in the receiving chamber to impact the first and second convex sections, impact force is mainly concentrated on the first and second convex sections. Because the thickness of the concave section between the first convex section and the second convex section is relatively thin, the bottom supporting plate is concave in the buffer cavity at the position of the concave section, and the whole bottom supporting plate is V-shaped.

The middle part position of backing plate is sunken towards the buffering intracavity, and the resilience force that the backing plate produced is bigger, and is better to electrode assembly's buffering effect, can carry out better protection to electrode assembly, and then has improved energy memory's life.

In some embodiments, the bottom plate further comprises two second buffer portions, wherein one second buffer portion is connected to a side of the first protruding section away from the recessed section, and the other second buffer portion is connected to a side of the second protruding section away from the recessed section.

The second buffer part is provided with a buffer hole, the buffer hole penetrates through the second buffer part along the thickness direction of the bottom supporting plate, and electrolyte is contained in the buffer cavity.

By arranging the two second buffer parts, the dimension of the bottom support plate in the width direction is increased, and the elasticity of the bottom support plate is better. When the first protruding section and the second protruding section between the two second buffer parts are subjected to impact force, the bottom supporting plate is easier to elastically deform towards the buffer cavity at the position of the recessed section. The buffering performance of the bottom support plate is better, and the electrode assembly can be better protected, so that the service life of the energy storage device is longer.

When the bottom supporting plate is elastically deformed, the bottom supporting plate is sunken downwards at the sunken section, and the whole bottom supporting plate is V-shaped. At this time, the space of the buffer cavity is reduced, and the electrolyte in the buffer cavity is extruded and flows out from the buffer hole. The electrolyte is extruded and then is positioned between the second surface and the electrode assembly, and when the impact force of the electrode assembly is reduced to be lower than the rebound force of the bottom supporting plate, the bottom supporting plate rebounds. The bottom support plate presses electrolyte between the second surface and the electrode assembly up between the pole pieces of the electrode assembly during rebound. The electrolyte lubricates the pole piece, so that the energy storage device has better performance and longer service life.

In some embodiments, the second buffer portion is provided with a plurality of buffer holes, and the plurality of buffer holes are arranged in two rows, wherein one row of buffer holes and the other row of buffer holes are arranged at intervals along the width direction of the bottom plate. The plurality of buffer holes of each row are arranged at intervals along the length direction of the bottom supporting plate.

By providing a plurality of buffer holes, more electrolyte can flow out from within the buffer holes between the second surface and the electrode assembly when the bottom plate is pressed. In the rebound process of the bottom support plate, more electrolyte is extruded between the pole pieces of the electrode assembly, so that the pole pieces of the electrode assembly are better lubricated, and the energy storage device is better in performance and longer in service life.

In some embodiments, the outer profile of the bottom plate is rectangular with four corners as rounded corners, the bottom plate comprises four outer peripheral edges, and any two adjacent outer peripheral edges are connected through curved edges to form rounded corners.

By setting the four corners of the bottom plate as rounded corners, the outer peripheral outline of the bottom plate is adapted to the side outline of the accommodating cavity, so that the bottom plate can be smoothly placed into the bottom of the accommodating cavity. And the outer periphery of the bottom support plate is smoother, so that the bottom support plate is not easy to scratch a Mylar film (mylar) in the assembly process, the damage to parts is avoided, and the service life of a product is prolonged.

In addition, the bottom support plate has the clearance between fillet position and holding chamber bottom edge, and when the bottom support plate was compressed, the space in buffer chamber became little, and more electrolyte was extruded to between the pole piece from the gap, and the pole piece obtains better lubrication for energy memory's performance is better, and the life-span is longer.

In some embodiments, the housing includes a bottom wall including a first bottom surface and a second bottom surface disposed opposite each other in a thickness direction of the bottom wall. The first bottom surface forms a cavity bottom surface of the receiving cavity. The second bottom surface is a portion of the outer surface of the housing. The shell is provided with explosion-proof holes, and the explosion-proof holes penetrate through the first bottom surface and the second bottom surface and are communicated with the accommodating cavity. The housing assembly further includes an explosion-proof valve secured to the bottom wall and covering the explosion-proof aperture.

Side reactions can occur in the chemical system in the accommodating cavity after long-term charging and discharging, and a large amount of gas is generated to swell the electrode assembly. When the pressure of the gas in the accommodating cavity is overlarge, the explosion-proof valve is opened to release pressure, so that the explosion caused by overlarge air pressure in the energy storage device is prevented, and the safety performance is improved.

In addition, since the gas is denser than the electrolyte, the gas generally accumulates at the top end of the receiving chamber and the electrolyte accumulates at the bottom end. Through setting up explosion-proof valve on the diapire of shell, when energy memory internal pressure is too big makes explosion-proof valve explode, electrolyte is spouted from the explosion-proof hole of diapire at first, then is located the gas at holding the chamber top and just is discharged.

Therefore, after the explosion-proof valve of the bottom wall is exploded, electrolyte in the accommodating cavity is basically discharged from the explosion-proof hole of the bottom wall, an ion channel between the pole pieces is cut off, the continuous reaction of the positive pole and the negative pole of the electrode assembly is avoided, and the safety performance of the battery is improved.

In some embodiments, the housing assembly further comprises a slide bar comprising a first sliding section with a side surface protruding with a sliding bump. The first sliding section is arranged in the buffer cavity, the sliding lug faces the first bottom surface, and the first sliding section can move in the buffer cavity, so that the sliding lug moves to be abutted against the explosion-proof valve.

When the energy storage device is in a stable state, the sliding lug is positioned at the edge of the explosion-proof valve. When the inside of the energy storage device is abnormal, the first sliding section slides towards the explosion-proof valve in the buffer cavity, so that the sliding lug moves to the upper part of the explosion-proof valve and abuts against the explosion-proof valve. The explosion-proof valve is broken and depressurized, so that explosion caused by overlarge air pressure in the energy storage device is avoided.

In the related art, the explosion-proof valve is mostly broken through the internal air pressure, but because the explosion-proof valve is often shielded by foreign matters in the accommodating cavity, when the air pressure reaches the explosion value, the air pressure cannot fully act on the explosion-proof valve due to shielding of the foreign matters, and the explosion-proof valve cannot burst and release pressure when the air pressure reaches the explosion value, so that the energy storage device explodes.

In this embodiment, the explosion-proof valve is exploded and depressurized by the sliding bump abutting the explosion-proof valve, the sliding bump directly contacts the explosion-proof valve, and the sliding bump directly acts on the explosion-proof valve with the gas pressure and the impact force of the electrode assembly. The explosion-proof valve can accurately blast and release pressure, and the safety of the energy storage device is higher.

In some embodiments, the slide bar further comprises a second sliding section, the second sliding section being connected at an angle to the first sliding section. The second sliding section includes a deformed section. The receiving cavity further includes a cavity side surface connected to the cavity bottom surface. One side of the second sliding section faces the side face of the cavity, and the deformation section is located on one side, away from the side face of the cavity, of the second sliding section. Under the action of external force, the deformation section deforms to enable the second sliding section to move towards the bottom surface of the cavity, and the second sliding section enables the first sliding section to move towards the explosion-proof valve, so that the sliding protruding block moves to be abutted against the explosion-proof valve.

When the energy storage device is abnormal, the electrode assembly firstly generates heat and expands to the periphery, and then generates heat and expands along the height direction. The electrode assembly expands to the deformation section to be abutted against the deformation section, so that the deformation section deforms towards the side face of the cavity, the second sliding section is pushed to move towards the bottom face of the cavity, and the second sliding section pushes the first sliding section to move towards the explosion-proof valve until the sliding protruding block is opposite to the explosion-proof valve. Then the electrode assembly generates heat and expands along the direction of height, electrode assembly butt collet board, collet board butt first slip section for the explosion-proof valve of slip lug butt, when the pressure of propping is greater than the limit of breaking of explosion-proof valve, explosion-proof valve is broken by slip lug butt, and energy memory realizes the pressure release, avoids the inside atmospheric pressure of energy memory too big and the explosion that takes place, has guaranteed energy memory's security performance.

In some embodiments, the second sliding section is provided with a protrusion, the protrusion is provided on an end surface of the second sliding section facing the cavity side, and the protrusion is located between the deformation section and the first sliding section. The protrusion abuts the cavity side.

Because the second sliding section passes through the point contact between protruding and the first chamber side, the friction force of second sliding section and first chamber side is less for the second sliding section slides towards the chamber bottom surface more easily.

In some embodiments, the explosion proof valve includes a first explosion proof face and a second explosion proof face, the first explosion proof face and the first bottom face being oriented the same, and the second explosion proof face and the second bottom face being oriented the same, along a thickness direction of the explosion proof valve. The first explosion-proof surface is concavely provided with a first nick. The sliding lug extends into the first notch and is abutted with the bottom surface of the first groove of the first notch.

By arranging the first notch, on one hand, the sliding lug slides to the first notch and stretches into the first notch. The first nick can limit the sliding lug to prevent the sliding lug from continuing to move or retracting. The sliding lug can be always abutted to the first notch, the acting force acts on the first notch all the time, the strength of the first notch is reduced, and when the internal gas pressure is increased to a certain value, the explosion-proof valve can be broken and pressure relieved at the first notch.

On the other hand, the thickness of the first notch is relatively smaller, and the explosion-proof valve is easier to crack and release pressure at the first notch.

The explosion-proof valve breaks a small opening at the first notch, so that electrolyte is sprayed out, and the pressure during the electrolyte spraying acts on the cracking part of the explosion-proof valve to further drive the explosion-proof valve to be lifted up in a whole piece, so that the energy storage device can release pressure more quickly.

In some embodiments, the explosion-proof valve is further provided with a second notch, the second notch is concavely arranged on the second explosion-proof surface, and the first notch and the second notch are arranged opposite to each other along the thickness direction of the explosion-proof valve.

The thickness of the position of the sliding lug abutting the explosion-proof valve is smaller, the explosion-proof valve is easier to break and release pressure, and the safety of the energy storage device is higher.

In some embodiments, the first surface is provided with a first clamping piece and a second clamping piece in a protruding mode, and the first clamping piece and the second clamping piece are arranged at intervals along the width direction. The first clamping piece is provided with a first clamping groove, and the second clamping piece is provided with a second clamping groove. Opposite sides of the first sliding section are respectively clamped in the first clamping groove and the second clamping groove. The first sliding section can slide in the first clamping groove and the second clamping groove.

The two sides of the first sliding section are clamped in the first clamping groove and the second clamping groove, and the first clamping groove and the second clamping groove limit the first sliding section in the width direction and the height direction. So that the first sliding section slides more smoothly.

A second aspect of the present application provides a powered device, including the energy storage device provided in the first aspect of the present application, the energy storage device is used for supplying power.

The embodiment of the application provides an energy storage device. By providing the bottom support in the receiving chamber, the bottom support plate supports the bottom of the electrode assembly. When the energy storage device is impacted by the outside, the electrode assembly shakes in the accommodating cavity to strike the bottom supporting plate, and the bottom supporting plate receives the impact force of the electrode assembly. Because the bottom supporting plate is the elastic component, and the thickness of concave section is thinner relatively, can take place elastic deformation at the cushion chamber when the bottom supporting plate receives the impact force of electrode assembly, the bottom supporting plate produces the resilience force opposite with impact force direction at elastic deformation's in-process, and resilience force consumes impact force in order to cushion electrode assembly, prevents that electrode assembly from taking place the striking and damaging, and then has improved the life of product.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings that are required to be used in the embodiments will be briefly described below.

Fig. 1 is an application scenario diagram of an energy storage device according to an embodiment of the present application.

Fig. 2 is a schematic perspective view of the energy storage device shown in fig. 1.

Fig. 3 is a schematic structural view of a housing assembly of the energy storage device of fig. 2.

Fig. 4 is an exploded view of the housing assembly shown in fig. 3.

Fig. 5 is a schematic view of the structure of the housing assembly of fig. 3.

Fig. 6 is an enlarged view of a portion a of fig. 4.

Fig. 7 is a schematic view of the construction of the shoe of the housing assembly of fig. 3.

Fig. 8 is a projection view of the shoe of fig. 7 in the X-axis direction.

Fig. 9 is a perspective cross-sectional view of the housing assembly shown in fig. 3.

Fig. 10 is an enlarged view of a portion B of fig. 9.

Fig. 11 is another perspective cross-sectional view of the housing assembly shown in fig. 3.

Fig. 12 is an enlarged view of the section I of fig. 11.

Fig. 13 is a schematic view of the slide of the housing assembly of fig. 3.

Fig. 14 is an enlarged view of a portion C of fig. 11.

Fig. 15 is an enlarged view of a portion D of fig. 11.

Fig. 16 is a schematic view of the structure of the deformed segment when deformed.

Fig. 17 is an enlarged view of the portion E of fig. 16.

FIG. 18 is a schematic structural view of the assembly of the slider and the shoe.

Reference numerals illustrate: 1000-energy storage device, 100-end cap assembly, 80-post, 30-positive post, 40-negative post, 2000-photovoltaic panel, 3000-fan, 4000-grid, 500-housing assembly, 510-housing, 511-bottom wall, 512-first perimeter wall, 513-second perimeter wall, 514-third perimeter wall, 515-fourth perimeter wall, 516-receiving cavity, 517-cavity floor, 518-first cavity side, 519-second cavity side, 520-third cavity side, 521-fourth cavity side, 522-mounting slot, 523-explosion-proof aperture, 524-first floor, 525-second floor, 534-first slot floor, 526-second slot floor, 530-explosion-proof valve, 531-first explosion-proof face, 532-second explosion-proof face, 533-first score, 535-second score, 540-shoe, 541-shoe, 542-first leg, 543-second leg, 544-first surface, 545-second surface, 546-buffer cavity, 547-first buffer, 548-convex segment, 549-concave segment, 550-reference axis, 551-first edge, 552-second edge, 553-first convex segment, 554-second convex segment, 555-second buffer, 556-buffer hole, 557-first clip, 558-second clip, 559-first clip slot, 560-second clip slot, 561-first clip face, 562-second clip face, 563-third clip face, 564-fourth clip face, 570-slide, 571-first sliding section, 572-sliding bump, 573-first sliding surface, 574-second sliding surface, 575-second sliding section, 576-deformed section, 577-third sliding surface, 578-fourth sliding surface, 579-protrusion.

Detailed Description

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

Because of the strong timeliness and space properties of energy required by people, in order to reasonably utilize the energy and improve the utilization rate of the energy, one energy form needs to be stored by one medium or equipment and then converted into another energy form, and the energy is released in a specific energy form based on future application. It is well known that the main way to generate green electric energy is to develop green energy sources such as photovoltaic, wind power and the like to replace fossil energy sources. At present, the generation of green electric energy generally depends on photovoltaic, wind power, water potential and the like, but wind energy, solar energy and the like generally have the problems of strong intermittence and large fluctuation, which can cause unstable power grid, insufficient peak electricity consumption, too much electricity consumption and unstable voltage can cause damage to the electric power, so that the problem of 'wind abandoning and light abandoning' possibly occurs due to insufficient electricity consumption requirement or insufficient power grid acceptance, and the problem needs to be solved by relying on energy storage. The energy is converted into other forms of energy through physical or chemical means and is stored, the energy is converted into electric energy when needed and released, in short, the energy storage is similar to a large-scale 'charge pal', the electric energy is stored when the photovoltaic and wind energy are sufficient, and the stored electric power is released when needed.

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

The existing energy storage (i.e. energy storage) application scene is wider, including aspects such as (wind and light) power generation side energy storage, electric network side energy storage, base station side energy storage and user side energy storage, 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 small and medium energy storage electric cabinet is applied to industrial and commercial energy storage scenes (banks, markets and the like) at the user side, and the main operation mode is 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.

Referring to fig. 1 and 2, the energy storage device provided in the embodiments of the present application is applied to an energy storage system, where the energy storage system includes an electric energy conversion device (photovoltaic panel 2000), a wind energy conversion device (fan 3000), a power grid 4000 and an energy storage device 1000, and the energy storage device 1000 can be used as an energy storage cabinet and can be installed outdoors. In particular, the photovoltaic panel 2000 may convert solar energy into electric energy during low electricity price period, and the energy storage device 1000 is used to store the electric energy and supply the electric power to the electric grid 4000 during peak electricity consumption or supply the electric power during power failure/power outage of the electric grid 4000. Wind energy conversion device (fan 3000) may convert wind energy into electrical energy, and energy storage device 1000 is used to store the electrical energy and supply electrical grid 4000 at peak power usage or at power outage/power failure of electrical grid 4000. The transmission of the electric energy can be performed by adopting a high-voltage cable.

The number of the energy storage devices 1000 may be several, and the several energy storage devices 1000 are connected in series or parallel, and the several energy storage devices 1000 are supported and electrically connected by using a separator (not shown). In this embodiment, "a plurality of" means two or more. An energy storage tank may be further disposed outside the energy storage device 1000, for accommodating the energy storage device 1000.

It is understood that the energy storage device 1000 may include, but is not limited to, a battery cell, a battery module, a battery pack, a battery system, etc. The practical application form of the energy storage device provided in the embodiment of the present application may be, but is not limited to, the listed products, and may also be other application forms, and the embodiment of the present application does not strictly limit the application form of the energy storage device 1000. The embodiment of the present application will be described by taking the energy storage device 1000 as a multi-core battery as an example.

The embodiment of the present application will be described by taking the energy storage device 1000 as a multi-core battery as an example.

Referring to fig. 2 and 3, the energy storage device 1000 includes an end cap assembly 100, an electrode assembly (not shown), an adapter (not shown), and a case assembly 500. The case assembly 500 has an opening and is provided with a receiving chamber in which the electrode assembly is received. The cap assembly 100 is mounted to one end of the electrode assembly, and the cap assembly 100 is sealed to the opening of the case assembly 500. The adapter is connected between the end cap assembly 100 and the electrode assembly.

The electrode assembly comprises a pole core, the end cover assembly 100 comprises a pole post 80, the electrode assembly comprises a pole lug, and the pole post 80 is welded and fixed with the pole lug through an adapter. It will be appreciated that there are two poles 80, and the two poles 80 are respectively the positive pole 30 and the negative pole 40, and the corresponding lugs of the electrode assembly include a positive lug and a negative lug, the positive pole 30 and the positive lug are welded and fixed by an adaptor, and the negative pole 40 and the negative lug are welded and fixed by another adaptor.

For convenience of description, the length direction of the housing assembly 500 shown in fig. 2 is defined as an X-axis direction, the width direction of the housing assembly 500 is defined as a Y-axis direction, and the height direction of the housing assembly 500 is defined as a Z-axis direction, wherein the X-axis direction, the Y-axis direction and the Z-axis direction are perpendicular to each other. The terms "upper", "top", "lower", "bottom", "left", "right", and the like in the description of the embodiments of the present application are described according to the directions shown in fig. 2 of the specification, and are not limited to the energy storage device 1000 in the practical application scenario. The use of "identical", "equal" or "parallel" in the following allows for certain tolerances.

Referring to fig. 3 and 4, the housing assembly 500 includes a housing 510, a shoe 540, an explosion-proof valve 530, and a slider 570. Referring to fig. 5, the housing 510 is a rectangular parallelepiped housing, and the housing 510 includes a bottom wall 511, a first peripheral wall 512, a second peripheral wall 513, a third peripheral wall 514, and a fourth peripheral wall 515. The first, second, third and fourth peripheral walls 512, 513, 514 and 515 are connected end to end in sequence and are fixed to the outer periphery of the bottom wall 511. The bottom wall 511, the first peripheral wall 512, the second peripheral wall 513, the third peripheral wall 514, and the fourth peripheral wall 515 enclose a housing cavity 516 that is open on one side. The accommodating chamber 516 has a chamber bottom surface 517 opposite to the opening, a first chamber side surface 518 and a second chamber side surface 519 opposite to each other in the X-axis direction, and a third chamber side surface 520 and a fourth chamber side surface 521 opposite to each other in the Y-axis direction.

Referring to fig. 5 and 6, the bottom wall 511 of the housing 510 is further provided with a mounting groove 522 and a explosion proof hole 523. Specifically, the bottom wall 511 includes a first bottom surface 524 and a second bottom surface 525 disposed opposite to each other in the thickness direction, the first bottom surface 524 forming the cavity bottom surface 517. The mounting groove 522 is concavely formed in the second bottom surface 525, and the explosion-proof hole 523 penetrates the second groove bottom surface 526 and the first bottom surface 524 of the mounting groove 522. The mounting groove 522 is used to mount the explosion proof valve 530 so that the explosion proof valve 530 may cover the explosion proof hole 523. The explosion-proof valve 530 is fixed to the mounting groove 522 by welding, and the explosion-proof valve 530 covers the explosion-proof hole 523.

Side reactions occur in the chemical system inside the accommodating cavity 516 after long-term charge and discharge, and a large amount of gas is generated to swell the electrode assembly. When the gas pressure in the accommodating cavity 516 is too high, the explosion-proof valve 530 is opened to release pressure, so that the explosion caused by the excessive gas pressure in the energy storage device is prevented, and the safety performance is improved.

In addition, since the gas is denser than the electrolyte, it is common that the gas is concentrated at the top end of the receiving chamber 516 and the electrolyte is concentrated at the bottom end. By disposing the explosion-proof valve 530 on the bottom wall 511 of the housing 510, when the internal pressure of the energy storage device is excessively large to cause the explosion-proof valve 530 to be exploded, the electrolyte is first ejected from the explosion-proof hole 523 of the bottom wall 511, and then the gas located at the top end of the accommodating chamber 516 is discharged.

Therefore, after the explosion-proof valve 530 of the bottom wall 511 is exploded, the electrolyte in the accommodating cavity 516 is basically discharged from the explosion-proof hole 523 of the bottom wall 511, so that the ion channel between the pole pieces is cut off, the continuous reaction of the positive pole and the negative pole of the electrode assembly is avoided, and the safety performance of the battery is improved.

Referring to fig. 7 and 8, the base 540 includes a base plate 541, a first leg 542, and a second leg 543. The bottom plate 541 is a sheet body, and the bottom plate 541 includes a first surface 544 and a second surface 545 that are disposed opposite to each other in a thickness direction. The first leg 542 and the second leg 543 are each protruded from the first surface 544, the first leg 542 and the second leg 543 are elongated, and the first leg 542 and the second leg 543 extend along the X-axis direction. And the first and second legs 542 and 543 are located at opposite side edges of the first surface 544 in the width direction of the bottom plate 541. The bottom bracket 540 is an elastic member, and the bottom bracket plate 541, the first leg 542, and the second leg 543 may be integrally injection molded of a polypropylene (PP) material.

Referring to fig. 8, 9 and 10, the bottom plate 541 includes a first buffer portion 547, and the first buffer portion 547 is located between the first leg 542 and the second leg 543. The first buffer 547 includes a convex section 548 and a concave section 549, and the convex section 548 and the concave section 549 are connected in the Y-axis direction. The thickness of the convex section 548 is greater than the thickness of the concave section 549 in the thickness direction of the base plate 541. Specifically, the convex section 548 and the concave section 549 extend in the X-axis direction, and the dimensions of the convex section 548 and the concave section 549 in the X-axis direction are equal to the dimensions of the base plate 541 in the X-axis direction. Referring to fig. 9 and 10, the bottom support 540 is disposed in the accommodating cavity 516, the first surface 544 faces the cavity bottom 517, the second surface 545 faces the opening of the accommodating cavity 516, and the bottom support 540 covers the entire cavity bottom 517. The first leg 542 and the second leg 543 each abut the cavity bottom surface 517, and a space is provided between the first surface 544 and the cavity bottom surface 517 in the height direction of the housing assembly 500, which forms a buffer cavity 546.

The bottom support 540 is positioned between the cavity floor 517 and the electrode assembly, with the bottom of the electrode assembly contacting the second surface 545, i.e., the bottom support plate 541 supports the electrode assembly.

When the energy storage device is externally impacted, the electrode assembly shakes in the accommodating cavity 516 to impact the bottom plate 541, and the bottom plate is impacted by impact force in the direction towards the negative Z-axis direction. Because the material of the bottom support 540 is polypropylene (PP), the bottom support 540 has elasticity, and the thickness of the bottom support plate 541 in the recess 549 is relatively thin. The backing plate 541 can be towards the cushion chamber 546 in the elastic deformation after receiving the impact force, and backing plate 541 produces the resilience force towards Z axle forward direction at deformation in-process, and the direction of resilience force is opposite with the impact force direction that electrode assembly acted on backing plate 541, and the impact force is consumed by the resilience force in order to cushion electrode assembly, avoids electrode assembly to go up the tab fracture of being connected with the changeover piece, has prevented that electrode assembly from directly striking chamber bottom surface 517 and taking place the damage when rocking. Thereby improving the service life of the energy storage device. When the impact force is consumed by the rebound force, the bottom plate 541 rebounds by the rebound force, and the bottom plate 541 returns to the original shape.

In addition, the bottom plate 541 is further provided with a convex section 548, and the thickness of the convex section 548 is thicker, so that the structural strength of the first buffer 547 can be enhanced, and the electrode assembly can be supported by the bottom plate 541 with better strength.

In this embodiment, referring to fig. 11 and 12, a gap X is formed between the outer periphery of the bottom plate 541 and the first, second, third and fourth cavity sides 518, 519, 520, 521 along the Z-axis direction.

After the electrode assembly is mounted in the receiving chamber, the receiving chamber also needs to be filled with electrolyte, which flows into the buffer chamber 546 along the gap X between the first chamber side 518 and the bottom plate 541 and the gap X between the second chamber side 519 and the bottom plate 541. That is, the buffer chamber 546 contains the electrolyte, the electrolyte plays a role of a water bed, and when the electrode assembly shakes to impact the bottom plate 541, the electrolyte in the buffer chamber 546 can further slow down the impact force of the electrode assembly, so that the electrode assembly can be better buffered when shaking, and the electrode assembly cannot be easily damaged, thereby prolonging the service life of the energy storage device.

In this embodiment, referring to fig. 8, 9 and 10, the protruding section 548 is formed by protruding the second surface 545 away from the first surface 544, i.e. the protruding section 548 protrudes toward the electrode assembly, and the protruding section 548 supports the electrode assembly when the electrode assembly is disposed in the receiving cavity 516. When the energy storage device is subjected to an external impact, the electrode assembly is shaken downward, and the electrode assembly transmits the impact force to the protruding section 548. When the impact force is concentrated on the raised section 548 and the bottom support plate 541 is impacted by the electrode assembly, the bottom support plate 541 is easier to elastically deform towards the buffer cavity 546 at the positions of the raised section 548 and the recessed section 549, so that the buffer performance of the bottom support plate 541 on the electrode assembly is better, and the service life of the energy storage device is longer.

In this embodiment, referring to fig. 7 and 8, along the thickness direction of the bottom plate 541, the protruding section 548 has a reference axis 550, a first edge 551 and a second edge 552, wherein the reference axis 550 is a central axis of the protruding section 548 along the Y axis direction, and the first edge 551 and the second edge 552 are opposite side edges of the protruding section 548 along the Y axis direction. From the first edge 551 to the reference axis 550, the distance H1 from the second surface 545 to the first surface 544 increases gradually, and the thickness of the raised section 548 increases gradually. From the reference axis 550 to the second edge 552, the distance H2 from the second surface 545 to the first surface 544 gradually decreases and the thickness of the raised section 548 gradually decreases.

It can be appreciated that the convex section 548 is arc-shaped, the arc surface on the convex section 548 gradually transits with the second surface 545, the bottom support plate 541 has better ductility in the process of elastic deformation, and the generated resilience force is larger, so that the buffering performance of the electrode assembly is better, the electrode assembly can be better protected, and the service life of the energy storage device is further prolonged.

Referring to fig. 7, 8 and 9, there are two protruding sections 548, which are a first protruding section 553 and a second protruding section 554, respectively. The first convex section 553 and the second convex section 554 connect opposite sides of the concave section 549 in the width direction, respectively.

The first convex section 553 and the second convex section 554 are convex on the second surface 545, and the first convex section 553, the concave section 549 and the second convex section 554 are sequentially linked along the positive direction of the Y axis. The first and second boss sections 553 and 554 are boss toward the electrode assembly and support the electrode assembly. By providing the first and second boss sections 553 and 554 to support the electrode assembly, on the one hand, the electrode assembly has two support points along the Z-axis direction, so that the stability of the electrode assembly is higher.

On the other hand, the first and second boss sections 553 and 554 support the electrode assembly. When the electrode assembly is shaken in the receiving cavity 516 to impact the first and second boss sections 553 and 554, impact force is mainly concentrated on the first and second boss sections 553 and 554. Due to the relatively thin thickness of the recessed section 549 between the first raised section 553 and the second raised section 554, the bottom plate 541 is recessed into the buffer cavity 546 at the location of the recessed section 549, where the entire bottom plate 541 is V-shaped.

The middle part position of backing plate 541 is sunken in towards the cushion chamber 546, and the resilience force that backing plate 541 produced is bigger, and is better to electrode assembly's buffering effect, can carry out better protection to electrode assembly, and then has improved energy storage device's life.

In this embodiment, referring to fig. 7, 8, 9 and 10, the bottom plate 541 further includes two second buffer portions 555, wherein, along the Y-axis direction, one of the second buffer portions 555 is connected to a side of the first protruding section 553 away from the recessed section 549, and the other second buffer portion 555 is connected to a side of the second protruding section 554 away from the recessed section 549.

The second buffer portion 555 is provided with a buffer hole 556, and along the thickness direction of the bottom plate 541, the buffer hole 556 penetrates the second buffer portion 555, that is, the buffer hole 556 penetrates the first surface 544 and the second surface 545, and the buffer hole 556 is communicated with the buffer cavity 546. The buffer chamber 546 contains an electrolyte.

Specifically, the second buffer portions 555 are sheet bodies, and along the Y-axis direction, the first leg 542 is connected to an edge of one of the second buffer portions 555 away from the first protruding section 553, and the second leg 543 is connected to an edge of the other second buffer portion 555 away from the second protruding section 554.

It can be appreciated that by providing two second buffer portions 555, the dimension of the bottom plate 541 in the Y-axis direction is increased, and the elasticity of the bottom plate 541 is better. When the first protruding section 553 and the second protruding section 554 between the two second buffer portions 555 are subjected to impact force, the bottom support plate 541 is easier to elastically deform towards the buffer cavity 546 at the position of the concave section 549, the buffering performance of the bottom support plate 541 is better, and the electrode assembly can be better protected, so that the service life of the energy storage device is longer.

When the bottom plate 541 is elastically deformed, the bottom plate 541 is recessed downward at the recessed section 549, and the entire bottom plate 541 is V-shaped. At this time, the space of the buffer chamber 546 is reduced, and the electrolyte in the buffer chamber 546 is squeezed and flows out through the buffer hole 556.

The electrolyte is squeezed out between the second surface 545 and the electrode assembly, and when the impact force of the electrode assembly is reduced to be lower than the elastic force of the bottom plate 541, the bottom plate 541 rebounds in the positive direction of the Z-axis. The bottom plate 541 presses electrolyte between the second surface 545 and the electrode assembly up between the pole pieces of the electrode assembly during rebound. The electrolyte lubricates the pole piece, so that the energy storage device has better performance and longer service life.

In this embodiment, referring to fig. 7, 9 and 10, the second buffer portion 555 is provided with a plurality of buffer holes 556, and the plurality of buffer holes 556 are arranged in two rows, wherein one row of buffer holes 556 and the other row of buffer holes 556 are arranged at intervals along the Y-axis direction. The plurality of buffer holes 556 of each column are arranged at intervals in the X-axis direction.

By providing a plurality of buffer holes 556, more electrolyte can flow out of the buffer holes 556 between the second surface 545 and the electrode assembly as the base plate 541 is pressed. In the rebound process of the bottom support plate 541, more electrolyte is extruded between the pole pieces of the electrode assembly, so that the pole pieces of the electrode assembly are better lubricated, and the energy storage device is better in performance and longer in service life.

In this embodiment, referring to fig. 7, the bottom plate 541 has a rectangular outer contour with four corners as rounded corners, and the bottom plate 541 includes four outer peripheral edges, and any two adjacent outer peripheral edges are connected by a curved edge to form a rounded corner.

By providing the corners of the bottom plate 541 with rounded corners, the outer circumferential contour of the bottom plate 541 is adapted to the side contour of the receiving cavity 516, so that the bottom plate 541 can be smoothly placed into the bottom of the receiving cavity 516. And the outer periphery of the bottom plate 541 is smoother, and the bottom plate 541 is not easy to scratch the Mylar film (mylar) in the assembly process, so that the damage to the components is avoided, and the service life of the product is prolonged.

In addition, the bottom plate 541 has the clearance between the bottom edge of fillet position and holding chamber 516, and when bottom plate 541 was compressed, buffer chamber 546's space became smaller, and the electrolyte was extruded in the buffer chamber 546, and more electrolyte was extruded to between the pole piece from the gap department, and the pole piece obtains better lubrication for energy storage device's performance is better, and the life-span is longer.

In this embodiment, referring to fig. 11, 13 and 14, the sliding strip 570 includes a first sliding section 571, and a sliding protrusion 572 is protruding from a side surface of the first sliding section 571. The first sliding section 571 is disposed in the buffer chamber 546, the sliding protrusion 572 faces the first bottom surface 524, and the first sliding section 571 can move in the buffer chamber 546, so that the sliding protrusion 572 moves to abut against the explosion-proof valve 530.

Specifically, the first sliding section 571 is a sheet body. The first sliding section 571 includes a first sliding surface 573 and a second sliding surface 574 disposed opposite to each other in the thickness direction, the first sliding surface 573 faces the first bottom surface 524, the second sliding surface 574 faces the bottom plate 541 and abuts the bottom plate 541, and the sliding protrusion 572 protrudes from the first sliding surface 573.

When the energy storage device is in a stable state, the sliding protrusion 572 is located at the edge of the explosion proof valve 530. When an abnormality occurs in the interior of the energy storage device, the first sliding section 571 slides in the positive direction of the X axis within the buffer chamber 546 such that the sliding protrusion 572 moves above the explosion proof valve 530 and abuts the explosion proof valve 530. The explosion-proof valve 530 is broken and depressurized, so that explosion caused by overlarge air pressure in the energy storage device is avoided. Fig. 16 and 17 are schematic views showing the structure of the sliding protrusion 572 abutting the explosion-proof valve 530.

In the related art, the explosion-proof valve 530 is mostly broken by the internal air pressure, but since the foreign matter often shields the explosion-proof valve 530 in the accommodating cavity 516, when the air pressure reaches the explosion value, the air pressure cannot be fully applied to the explosion-proof valve 530 due to the shielding of the foreign matter, and the explosion-proof valve 530 cannot be exploded and decompressed when the air pressure reaches the explosion value, so that the energy storage device explodes.

In the present embodiment, the explosion-proof valve 530 is exploded and decompressed by the abutment of the sliding protrusion 572 against the explosion-proof valve 530, the sliding protrusion 572 directly contacts the explosion-proof valve 530, and the sliding protrusion 572 directly applies the gas pressure and the impact force of the electrode assembly to the explosion-proof valve 530. The explosion-proof valve 530 can accurately burst and release pressure, and the safety of the energy storage device is higher.

In this embodiment, referring to fig. 11, 13 and 15, the sliding strip 570 further includes a second sliding section 575, and the second sliding section 575 is a sheet body. The second sliding section 575 and the first sliding section 571 are connected by an included angle, that is, the sliding strip 570 has an L-shaped structure. The slide 570 may be formed by sheet metal bending. The second sliding section 575 is located between the electrode assembly and the first cavity side 518.

The second sliding section 575 includes a deformation section 576, one side of the second sliding section 575 facing the first cavity side 518, the deformation section 576 being located on a side of the second sliding section 575 facing away from the first cavity side 518. Specifically, the second sliding section 575 includes a third sliding surface 577 and a fourth sliding surface 578 disposed opposite to each other in the thickness direction, and the deformation section 576 is formed by protruding the third sliding surface 577 and the fourth sliding surface 578 toward the second cavity side surface 519, where the deformation section 576 may be formed by sheet metal stamping. The third sliding surface 577 faces the second cavity side surface 519 and the fourth sliding surface 578 faces the first cavity side surface 518.

Under the action of external force, the deformation section 576 deforms towards the first cavity side face 518, so that the second sliding section 575 is pushed to move towards the cavity bottom face 517, and the second sliding section 575 moves the first sliding section 571 towards the explosion-proof valve 530, so that the sliding protruding block 572 moves to abut against the explosion-proof valve 530.

Specifically, when the energy storage device is abnormal, the electrode assembly heats and expands along the X-axis and Y-axis directions, and then heats and expands along the Z-axis direction. It will be appreciated that the electrode assembly expands toward the deformation section 576 to abut the deformation section 576, deforming the deformation section 576 toward the first chamber side 518, and the deformation section 576 is flattened, such that the second sliding section 575 extends toward the chamber bottom 517. That is, the second sliding section 575 moves toward the cavity bottom surface 517, and the second sliding section 575 pushes the first sliding section 571 toward the explosion-proof valve 530 to move the sliding protrusion 572 opposite to the explosion-proof valve 530. Then the electrode assembly generates heat and expands along the Z-axis direction, the electrode assembly is abutted against the bottom supporting plate 541, the bottom supporting plate 541 is abutted against the first sliding section 571, the sliding protruding block 572 is abutted against the explosion-proof valve 530, when the propping pressure is greater than the breaking limit of the explosion-proof valve 530, the explosion-proof valve 530 is broken by the abutting of the sliding protruding block 572, the pressure of the energy storage device is relieved, explosion caused by overlarge air pressure in the energy storage device is avoided, and the safety performance of the energy storage device is guaranteed. Fig. 16 and 17 are schematic views showing the structure of the sliding protrusion 572 abutting the explosion-proof valve 530.

In this embodiment, referring to fig. 13 and 15, the second sliding section 575 is provided with a protrusion 579, the protrusion 579 is protruding on an end surface of the second sliding section 575 facing the cavity side, and the protrusion 579 is located between the deformation section 576 and the first sliding section 571. The projection 579 abuts the cavity side.

Specifically, the projection 579 is provided on the fourth sliding surface 578, and the projection 579 is in contact with the first cavity side surface 518. The projection 579 may be formed by sheet metal stamping. As the deformation section 576 deforms toward the first chamber side 518, the deformation section 576 pushes the second sliding section 575 toward the chamber bottom 517.

Because second sliding section 575 is in point contact with first cavity side 518 via protrusions 579, the friction force between second sliding section 575 and first cavity side 518 is less, making second sliding section 575 easier to slide toward cavity bottom 517.

In this embodiment, referring to fig. 14, the explosion-proof valve 530 includes a first explosion-proof surface 531 and a second explosion-proof surface 532. Along the thickness direction of the explosion-proof valve 530, the first explosion-proof surface 531 and the second explosion-proof surface 532 are disposed opposite to each other, the first explosion-proof surface 531 and the first bottom surface 524 are oriented in the same direction, and the second explosion-proof surface 532 and the second bottom surface 525 are oriented in the same direction. The first explosion-proof surface 531 is concavely provided with a first notch 533. The sliding bump 572 extends into the first notch 533 and abuts the first groove bottom surface 534 of the first notch 533.

By providing the first notch 533, on the one hand, the sliding bump 572 slides to the first notch 533 and protrudes into the first notch 533. The first notch 533 may limit the sliding bump 572 in the X-axis direction, prevent the sliding bump 572 from continuing to move in the X-axis negative direction, or retract in the X-axis positive direction. The sliding protrusion 572 can be always abutted against the first notch 533, the acting force is always applied to the first notch 533, the strength of the first notch 533 is reduced, and when the internal gas pressure is raised to a certain value, the explosion-proof valve 530 can be ruptured and decompressed at the first notch 533. On the other hand, the thickness of the first score 533 is relatively smaller, and the explosion proof valve 530 is more easily ruptured and depressurized at the first score 533.

The explosion-proof valve 530 breaks a small opening at the first notch 533, so that the electrolyte is sprayed out, and the pressure during the electrolyte spraying acts on the breaking position of the explosion-proof valve 530, so that the explosion-proof valve 530 is further driven to be lifted up, and the energy storage device can release pressure more quickly.

In this embodiment, referring to fig. 14, the explosion-proof valve 530 further includes a second notch 535, the second notch 535 is concavely disposed on the second explosion-proof surface 532, and the first notch 533 is disposed opposite to the second notch 535 along the thickness direction of the explosion-proof valve 530. That is, the thickness of the position where the sliding protrusion 572 abuts against the explosion-proof valve 530 is smaller, the explosion-proof valve 530 is easier to break and release pressure, and the safety of the energy storage device is higher.

In this embodiment, referring to fig. 8 and 18, the first surface 544 is convexly provided with a first clamping member 557 and a second clamping member 558, and the first clamping member 557 and the second clamping member 558 are disposed at intervals along the width direction. The first clamping member 557 has a first clamping groove 559, and the second clamping member 558 has a second clamping groove 560. Opposite sides of the first sliding section 571 are respectively clamped in the first clamping groove 559 and the second clamping groove 560. The first sliding section 571 can slide in the first clamping groove 559 and the second clamping groove 560.

Specifically, the first clamping member 557 and the second clamping member 558 are L-shaped, and the first clamping member 557 includes a first clamping surface 561 and a second clamping surface 562, where the first clamping surface 561 and the second clamping surface 562 are vertically disposed. The second clamping member 558 includes a third clamping surface 563 and a fourth clamping surface 564, with the third clamping surface 563 and the fourth clamping surface 564 being disposed vertically. The first engagement surface 561 and the third engagement surface 563 are opposite in the Y-axis direction. Along the Z-axis, the second engagement surface 562 is opposite the first surface 544, and the fourth engagement surface 564 is opposite the first surface 544.

The first surface 544, the first clamping surface 561 and the second clamping surface 562 enclose a first clamping groove 559 with a combined opening facing the second clamping member 558, and the first surface 544, the third clamping surface 563 and the fourth clamping surface 564 enclose a second clamping groove 560 with a combined opening facing the first clamping member 557. The first sliding section 571 is clamped in the first clamping groove 559 and the second clamping groove 560 along two sides of the Y-axis direction, the first clamping surface 561 and the third clamping surface 563 limit the first sliding section 571 in the Y-axis direction, and the first surface 544, the second clamping surface 562 and the fourth clamping surface 564 limit the first sliding section 571 in the Z-axis direction. So that the first sliding section 571 slides more smoothly.

The foregoing has outlined rather broadly the more detailed description of embodiments of the present application, wherein specific examples are provided herein to illustrate the principles and embodiments of the present application, and wherein the above examples are provided to assist in the understanding of the methods and concepts of the present application.

Claims

1. An energy storage device comprising a housing assembly and an electrode assembly, the housing assembly comprising a housing and a shoe; the shell is provided with a containing cavity with an opening at one side; the accommodating cavity is provided with a cavity bottom surface opposite to the opening;

the bottom support comprises a bottom support plate, a first support leg and a second support leg; the bottom plate comprises a first surface and a second surface; the first surface and the second surface are arranged opposite to each other along the thickness direction of the bottom supporting plate; the first support leg and the second support leg are both arranged on the first surface in a protruding mode, and the first support leg and the second support leg are located at two opposite side edges of the first surface along the width direction of the bottom supporting plate;

the bottom supporting plate is an elastic piece and comprises a first buffer part, and the first buffer part is positioned between the first support leg and the second support leg;

the first buffer part comprises a convex section and a concave section, and the convex section is connected with the concave section along the width direction of the bottom supporting plate; the thickness of the convex section is larger than that of the concave section along the thickness direction of the bottom supporting plate;

The bottom support piece is arranged in the accommodating cavity, the first surface faces the bottom surface of the cavity, the first support leg and the second support leg are both abutted against the bottom surface of the cavity, a space is formed between the first surface and the bottom surface of the cavity along the height direction of the shell assembly, and the space forms a buffer cavity;

the electrode assembly is disposed in the receiving cavity, and a bottom of the electrode assembly contacts the second surface.

2. The energy storage device of claim 1, wherein said receiving cavity further comprises a cavity side connected to said cavity bottom surface, said cavity side and said bottom plate having a gap therebetween along a direction perpendicular to said first surface.

3. The energy storage device of claim 1, wherein the convex section is formed by the second surface protruding away from the first surface.

4. The energy storage device of claim 3, wherein the protruding section has a reference axis, a first edge and a second edge along a thickness direction of the bottom plate, the reference axis being a central axis of the protruding section along the width direction, the first edge and the second edge being opposite side edges of the protruding section along the width direction;

The distance from the first edge to the reference axis, the second surface to the first surface increases gradually, and the thickness of the convex section increases gradually; from the reference axis to the second edge, the distance from the second surface to the first surface gradually decreases, and the thickness of the convex section gradually decreases;

the number of the protruding sections is two, and the two protruding sections are a first protruding section and a second protruding section respectively; the first protruding section and the second protruding section are respectively connected with two opposite sides of the concave section along the width direction.

5. The energy storage device of claim 4, wherein the bottom plate further comprises two second buffer portions, one of the second buffer portions being connected to a side of the first protruding section away from the recessed section, the other of the second buffer portions being connected to a side of the second protruding section away from the recessed section;

the second buffer part is provided with a buffer hole, and the buffer hole penetrates through the second buffer part along the thickness direction of the bottom supporting plate.

6. The energy storage device of claim 5, wherein the second buffer portion is provided with a plurality of buffer holes, and the plurality of buffer holes are arranged in two rows, wherein one row of buffer holes and the other row of buffer holes are arranged at intervals along the width direction of the bottom support plate; the plurality of buffer holes of each row are arranged at intervals along the length direction of the bottom supporting plate.

7. The energy storage device of claim 1, wherein the bottom plate has an outer contour in a rectangular shape with rounded corners, the bottom plate includes four outer peripheral edges, and any two adjacent outer peripheral edges are connected by a curved edge to form a rounded corner.

8. The energy storage device of any one of claims 1 to 7, wherein the housing comprises a bottom wall comprising a first bottom surface and a second bottom surface, the first bottom surface and the second bottom surface being disposed opposite one another in a thickness direction of the bottom wall; the first bottom surface forms a cavity bottom surface of the accommodating cavity; the second bottom surface is a portion of an outer surface of the housing;

the shell is provided with explosion-proof holes, and the explosion-proof holes penetrate through the first bottom surface and the second bottom surface and are communicated with the accommodating cavity;

the housing assembly further includes an explosion-proof valve secured to the bottom wall and covering the explosion-proof aperture.

9. The energy storage device of claim 8, wherein the housing assembly further comprises a slider comprising a first sliding segment with a sliding tab protruding from a side surface thereof; the first sliding section is arranged in the buffer cavity, the sliding lug faces the first bottom surface, and the first sliding section can move in the buffer cavity, so that the sliding lug moves to be abutted to the explosion-proof valve.

10. The energy storage device of claim 9, wherein the slider further comprises a second sliding segment, the second sliding segment being connected at an angle to the first sliding segment; the second sliding section comprises a deformation section;

the accommodating cavity further comprises a cavity side surface, and the cavity side surface is connected with the cavity bottom surface; one side of the second sliding section faces the cavity side face, and the deformation section is positioned on one side of the second sliding section away from the cavity side face; under the action of external force, the deformation section deforms to enable the second sliding section to move towards the bottom surface of the cavity, and the second sliding section enables the first sliding section to move towards the explosion-proof valve, so that the sliding protruding block moves to be abutted against the explosion-proof valve.

11. The energy storage device of claim 10, wherein the second sliding section is provided with a protrusion, the protrusion is protruding from an end surface of the second sliding section facing the cavity side, and the protrusion is located between the deformation section and the first sliding section; the protrusion abuts the cavity side.

12. The energy storage device of claim 9, wherein the explosion proof valve comprises a first explosion proof face and a second explosion proof face, the first explosion proof face and the first bottom face being oriented the same, and the second explosion proof face and the second bottom face being oriented the same, in a thickness direction of the explosion proof valve; the first explosion-proof surface is concavely provided with a first nick; the sliding lug extends into the first notch and is abutted with the bottom surface of the first groove of the first notch.

13. The energy storage device of claim 12, wherein the explosion proof valve further comprises a second score, the second score is concavely disposed on the second explosion proof surface, and the first score is disposed opposite to the second score along a thickness direction of the explosion proof valve.

14. The energy storage device of claim 9, wherein the first surface is provided with a first clamping member and a second clamping member in a protruding manner, and the first clamping member and the second clamping member are arranged at intervals along the width direction;

the first clamping piece is provided with a first clamping groove, and the second clamping piece is provided with a second clamping groove; opposite sides of the first sliding section are respectively clamped in the first clamping groove and the second clamping groove; the first sliding section can slide in the first clamping groove and the second clamping groove.

15. A powered device comprising an energy storage device as claimed in any one of claims 1 to 14 for supplying power.