CN116014366B - End cover assembly, energy storage device and electric equipment - Google Patents

Abstract

An end cover assembly, an energy storage device and an electrical equipment, wherein the end cover assembly comprises a bracket, a mounting member and a cover plate, the bracket comprises a bottom plate and a side baffle plate, the bottom plate and the side baffle plate are connected, the side baffle plate is bent and extended along the thickness direction of the bottom plate, the bracket is in a plane-symmetrical structure relative to the symmetric plane, the side baffle plate is close to the symmetric plane, and the bottom plate and the side baffle plate form a accommodating space; the mounting member comprises a top plate and a first side plate connected at an angle, the top plate and the bottom plate are relatively spaced apart, the first side plate and the side baffle plate are relatively spaced apart and have a spacing distance to form a first air passage; the cover plate is connected to the top plate and is located on the side of the top plate facing away from the bottom plate, the cover plate and the side baffle plate have a spacing distance to form a second air passage, and the second air passage is respectively connected to the first air passage and the accommodating space; the first air passage and the second air passage are connected to the above-mentioned accommodating space, so that air can gather to the accommodating space through the air passage, thereby improving the effect of gas gathering under the end cover assembly and the explosion-proof valve.

Description

End cover assembly, energy storage device and electrical equipment

Technical Field

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

Background technique

Energy storage devices are used to store energy and release it when needed. The current energy storage devices are mainly rechargeable secondary batteries. The common secondary batteries currently mainly include a shell, an electrode assembly and an end cap assembly. The electrode assembly is housed inside, the end cap assembly closes the shell, and the electrode lugs of the electrode assembly are connected to the poles on the cover assembly.

Due to manufacturing defects of secondary batteries, or stimulated by external temperature, mechanical, charging abnormalities, etc., irreversible side reactions will occur inside the battery, such as decomposition of SEI film, decomposition of positive electrode materials and decomposition of electrolyte, which will generate a large amount of heat and release small molecule gases. Under special conditions (such as high temperature, short circuit, vibration, extrusion and impact), thermal runaway such as bloating, smoking and even fire may easily occur, which poses certain safety hazards.

Summary of the invention

The purpose of the present application is to provide an end cover assembly, an energy storage device and an electrical equipment that can provide safety.

To achieve the purpose of this application, this application provides the following technical solutions:

In the first aspect, an embodiment of the present application provides an end cover assembly for an energy storage device, comprising a bracket, a mounting member and a cover plate, the bracket comprising a bottom plate and a side baffle plate, the bottom plate and the side baffle plate are connected, the side baffle plate is bent and extended along the thickness direction of the bottom plate, the bracket is in a plane-symmetrical structure relative to the symmetry plane, the symmetry plane is perpendicular to the plane where the bottom plate is located, the side baffle plate is close to the symmetry plane, and the bottom plate and the side baffle plate form a accommodating space; the mounting member comprises a top plate and a first side plate connected at an angle, the top plate and the bottom plate are relatively spaced apart, the first side plate and the side baffle plate are relatively spaced apart and have a spacing distance to form a first air duct; the cover plate is connected to the top plate and is located on the side of the top plate facing away from the bottom plate, the cover plate and the side baffle plate have a spacing distance to form a second air duct, and the second air duct is respectively connected to the first air duct and the accommodating space.

By designing the bottom plate and the side baffles in a face-symmetrical structure, a accommodating space can be enclosed, and the explosion-proof valve bracket can be accommodated in the accommodating space, so that the explosion-proof valve bracket can be protected by being wrapped by the bottom plate and the side baffles; and, a first air channel is formed between the first side plate and the side baffle, and a second air channel is formed between the cover plate and the side baffle. The first air channel and the second air channel are connected to the accommodating space mentioned above, so that air can gather to the accommodating space through the air channel, thereby improving the effect of gas gathering under the end cover assembly and the explosion-proof valve, ensuring that the explosion-proof valve can produce corresponding effects, and further improving the life and safety performance of the energy storage device.

In one embodiment, the side baffle extends along the thickness direction of the bottom plate and on a side facing away from the symmetry plane, and the side baffle comprises a first bending section, a second bending section and a third bending section connected in sequence, and the ratio of the first bending section: the second bending section: the third bending section is (2-3.5): (1.2-1.8): 1. By setting a winding gas path with a tortuosity from small to large, the gas flow is smoother.

In one embodiment, the bracket further includes a first side plate and a protrusion, the side baffle, the bottom plate and the protrusion are connected on the same side of the first side plate, the protrusion is located on the side of the side baffle away from the bottom plate, and the protrusion is close to the symmetry plane; the mounting member includes a second side plate, the second side plate is respectively connected to the bottom plate and the first side plate at an angle, the second side plate is arranged opposite to the first side plate, the second side plate is provided with a matching groove extending to the top plate, and the protrusion is connected with the matching groove. By designing the protrusion on the bracket and the matching groove on the mounting member, the protrusion can be matched and docked with the matching groove, thereby improving the connection stability between the bracket and the mounting member; at the same time, the protrusion can also be mirror-symmetrical about the symmetry plane, so that the protrusion can cooperate with the mounting member to support the middle part of the end cover assembly, thereby preventing the middle part of the long strip bracket from falling and deforming due to its own weight.

In one embodiment, the spacing distance H1 between the end of the side baffle away from the bottom plate and the cover plate is 0.01mm~0.95mm. Designing the above spacing distance H1 within this range is conducive to the gas flowing to the accommodation space through the second airway, and can prevent other foreign objects from passing through the airway. When the spacing distance H1 is smaller than the above range, the spacing size is too small to form an airway for free flow of gas; when the spacing distance H1 is larger than the above range, the spacing size is too large, and foreign objects in the end cover assembly are also easy to flow through the airway, such as broken pole ears or insulating films, which are easy to drift into the accommodation space along the airflow direction, making the explosion-proof valve ineffective.

In one embodiment, the side of the protrusion close to the symmetry plane and the side baffle have a spacing distance H2 of 1.5mm~4.5mm in the length direction of the bottom plate. By designing the above spacing distance H2 within this range, the gap between the edges of the two sides of the side baffle and the mounting piece closest to the explosion-proof valve bracket can be guaranteed, ensuring that there is enough space between the first side plate and the side baffle to form the first airway; at the same time, it is also convenient for the protrusion to be snap-fitted and assembled with the matching groove, and a matching margin is designed. When the spacing distance H2 is less than the above range, the spacing size is too small to form an airway for free flow of gas; when the spacing distance H2 is greater than the above range, the spacing size is too large, and foreign matter in the end cover assembly is also easy to flow through the airway, such as broken pole ears or insulating films, which are easy to drift into the accommodation space along the airflow direction, making the explosion-proof valve ineffective.

In one embodiment, the projection of the protrusion on the bottom plate is a trapezoid, the end of the protrusion away from the first side plate is the short top side of the trapezoid, and the end of the protrusion connected to the first side plate is the long bottom side of the trapezoid. By arranging the protrusion on the bracket and the projection of the protrusion on the bottom plate is a trapezoid, it is convenient to facilitate the smoothness of the protrusion and the mounting member when docking, and improve the reliability of the end cover assembly during assembly.

In one embodiment, the ratio D1:H3 of the depth D1 of the matching groove and the height H3 of the protrusion relative to the first side plate is 1.15 to 3.85. By designing the ratio of the depth D1 of the matching groove to the height H3 of the protrusion to be greater than 1, it can be ensured that the protrusion can be completely inserted into the matching groove.

In one embodiment, the protrusion is connected to at least two adjacent surfaces of the second side plate through an arc surface. By designing the protrusion to have an arc surface connection, the protrusion can be easily inserted into the matching groove, reducing the resistance during the protrusion insertion process.

In one embodiment, the end surface of the protrusion facing away from the first side plate and the surface facing the bottom plate have a first inclined surface, and the opening of the matching groove has a corresponding second inclined surface. By designing the protrusion to have a first inclined surface and the opening of the matching groove to have a second inclined surface, it is beneficial for the protrusion to be smoothly inserted through the matching of the inclined surfaces during insertion, thereby improving the convenience of installing and inserting the protrusion.

In one embodiment, the bracket further includes a first clip, the first clip is connected to the first side plate, and the first clip is located at the end of the protrusion away from the symmetry plane; the mounting piece further includes a clamping plate on the same plane as the second side plate, the clamping plate is provided with a first clamping hole opposite to the first clip, and the first clip is connected to the clamping plate through the first clamping hole. By providing the first clip on the bracket and providing the first clamping hole on the mounting piece, it is convenient to fix the bracket and the mounting piece to each other through the first clip; and the first clip can be mirror-symmetrical about the symmetry plane, so that there are two stacked first clips on the bracket, and the two first clips are clamped together. Even if the bracket is broken, the first clip can still clamp the mounting piece, thereby improving stability and thus increasing the service life of the energy storage device.

In one embodiment, the first buckle has a third inclined surface at one end away from the first side plate, and the first clip hole has a corresponding fourth inclined surface at its opening. By providing the third inclined surface on the first buckle and the fourth inclined surface at the first clip hole, the first buckle can be smoothly inserted through the cooperation of the inclined surfaces during insertion, thereby improving the speed of installation and insertion of the first buckle.

In one embodiment, the clamping plate includes a first surface and a second surface facing each other, the first surface faces the first side plate, the first clamping hole extends from the first surface to the second surface, and the first clamping hole is in a constricted shape from the first surface to the second surface. By designing the first clamping hole to be in a constricted shape from the first surface to the second surface, the four sides of the first clamping hole can be inclined surfaces for guiding the first clamping buckle, so that the first clamping buckle is easy to insert and buckle.

In one embodiment, the mounting member further includes a convex rib, the convex rib connecting the second surface and the top plate and extending in a direction away from the first surface. By providing the convex rib on one side of the clamping plate, the structural strength of the clamping plate can be increased to prevent the clamping plate from bending and deforming. At the same time, the convex rib can also be used to protect the end of the first buckle to prevent accidental release, improve the stability of the first buckle connection, and thus improve the service life of the energy storage device.

In one embodiment, the top plate includes a first boss portion and a second boss portion connected to each other, the first boss portion protruding from the plane where the top plate is located in a direction away from the bottom plate, the second boss portion is located at one end of the first boss portion away from the bottom plate, and an annular step is formed at the connection between the first boss portion and the second boss portion. By forming the first boss portion and the second boss portion on the top plate, and the first boss portion and the second boss portion are combined to form an annular step, it is beneficial to improve the sealing performance between the mounting member and the cover plate, thereby improving the safety performance of the energy storage device; at the same time, it is also convenient for the top plate to be clamped and positioned when it is installed on the cover plate from bottom to top, reducing the difficulty of assembly.

In one embodiment, the second boss portion is provided with a pole hole, and the pole hole is in a constricted shape from the bottom plate toward the top plate, and the hole size of the pole hole close to the bottom plate is larger than the hole size away from the bottom plate. By designing the pole hole to be in a constricted shape, it is beneficial for the flange of the sealing ring to be compressed and deformed to extend outward during the pole pressing process, and abut against the pole hole, thereby filling the gap of the pole hole, and the abutment surface between the flange of the sealing ring and the side wall of the pole hole becomes larger, further improving the sealing performance, thereby improving the safety performance of the energy storage device.

In one embodiment, the end cover assembly further includes an explosion-proof valve bracket, and the bracket further includes a second buckle, the second buckle is connected to the first side plate, and the second buckle is located between the protrusion and the symmetry plane; the explosion-proof valve bracket is provided with a second buckle hole, and the second buckle passes through the second buckle hole to connect with the explosion-proof valve bracket, and the height of the second buckle protruding relative to the first side plate is greater than the height of the first buckle protruding relative to the first side plate. By providing the second buckle on the bracket and providing the second buckle hole on the explosion-proof valve bracket, it is convenient to fix the bracket and the explosion-proof valve bracket to each other through the second buckle; and the advantage of the second buckle being longer than the first buckle is that when fastening, the second buckle in the middle area can be fastened first, and then the first buckles at both ends can be fastened, which reduces the difficulty of fastening the buckles at the same time and reduces the requirements for assembly operation accuracy.

In one embodiment, the end cap assembly includes two brackets, the two brackets are mirror-symmetrical, and the mounting piece is located between the two brackets, which reduces the number of molds for bracket production and improves the parts matching rate of the brackets, thereby reducing production costs. The mirror-symmetrical brackets are designed to be two, and the mounting piece is located between the two brackets, so that the brackets can be effectively used to fix the mounting piece, and the two fixed ends are subjected to the same force, and there will be no problem of deformation of the mounting piece.

In a second aspect, an embodiment of the present application further provides an energy storage device, comprising an electrode assembly, a shell, and an end cap assembly described in any one of the various embodiments of the first aspect, wherein the electrode assembly is disposed in the shell, and the end cap assembly is electrically connected to the electrode assembly.

In a third aspect, an embodiment of the present application further provides an electrical device, wherein the electrical device comprises the energy storage device described in the second aspect, and the energy storage device supplies power to the electrical device.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

FIG1 is a perspective view of an energy storage device according to an embodiment;

FIG2 is an exploded view of an energy storage device according to an embodiment;

FIG3 is an exploded view of an end cap assembly according to an embodiment;

FIG4 is a cross-sectional schematic diagram of an end cap assembly according to an embodiment;

FIG5 is a schematic structural diagram of a bracket, a mounting member and an explosion-proof valve bracket according to an embodiment;

FIG6 is a schematic structural diagram of a bracket according to an embodiment;

FIG7 is a schematic structural diagram of a mounting member according to an embodiment;

FIG8 is a schematic diagram of the installation of a protrusion and a matching groove according to an embodiment;

FIG9 is a schematic structural diagram of a snap-in plate according to an embodiment;

FIG10 is a top view of a mounting member according to an embodiment;

FIG. 11 is a schematic cross-sectional view of a mounting member according to an embodiment.

Description of reference numerals:

100-energy storage device, 10-end cover assembly, 20-electrode assembly, 30-housing;

11-bracket, 111-bottom plate, 112-side baffle, 1121-first bending section, 1122-second bending section, 1123-third bending section, 112A-left baffle, 112B-right baffle, 113-accommodating space, 114-first air duct, 115-second air duct, 116-first side plate, 117-bump, 117A-left bump, 117B-right bump, 1171-lower surface, 1172-top surface, 1173-bevel surface, 118-first buckle, 118A-first left buckle, 118B-first right buckle, 1181-third bevel, 119-second buckle, 119A-second left buckle, 119B-second right buckle, 11A-first bracket, 11B-second bracket, S-symmetric surface;

12-explosion-proof valve bracket, 121-second clamping hole, 122-baffle, 123-first connecting plate, 124-second connecting plate;

13-mounting member, 13A-positive electrode mounting member, 13B-negative electrode mounting member, 131-top plate, 132-first side plate, 132S-second side plate, 133-second side plate, 1331-matching groove, 1332-second inclined surface, 134-clamping plate, 1341-first clamping hole, 1342-left side bar, 1343-right side bar, 1344-upper side bar, 1345-lower side bar, 1346-fourth inclined surface, 1347-first surface, 1348-second surface, 135-convex rib, 136-first boss portion, 137-second boss portion, 138-pole space, 139-pole hole,

14-Cover.

Detailed ways

The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and/or" used in this application includes any and all combinations of one or more of the related listed items.

In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

The embodiment of the present application provides an energy storage device 100, please refer to Figures 1 and 2, including an electrode assembly 20, a shell 30 and an end cap assembly 10, the electrode assembly 20 is disposed in the shell 30, and the end cap assembly 10 is electrically connected to the electrode assembly 20. The end cap assembly 10 is also covered at the opening of the shell 30 and closes the shell 30.

The embodiment of the present application provides an end cover assembly 10 for an energy storage device 100 , referring to FIG. 3 , which includes a bracket 11 , a mounting member 13 , a cover plate 14 and an explosion-proof valve bracket 12 .

Specifically, please refer to Figure 4, the bracket 11 includes a bottom plate 111 and a side baffle 112, the bottom plate 111 and the side baffle 112 are connected, the side baffle 112 is bent and extended along the thickness direction of the bottom plate 111, the bracket 11 is mirror-symmetrical with respect to the symmetry plane S, the symmetry plane S is perpendicular to the plane where the bottom plate 111 is located, the side baffle 112 is close to the symmetry plane S, and the bottom plate 111 and the side baffle 112 enclose a receiving space 113.

Optionally, the bracket 11 is made of insulating material, specifically plastic material, such as PP (polypropylene). The bottom plate 111 is plate-shaped, and the plate surface is generally convex. The bottom plate 111 has length, width and thickness. When describing each structure later, the extension direction of the length of the bottom plate 111 is the length direction, the extension direction of the width is the width direction, and the extension direction of the thickness is the thickness direction.

Optionally, referring to FIG. 3 and FIG. 4 , the bracket 11 may be a mirror-symmetrical structure, and the symmetry plane S of the bracket 11 may be located in the middle of the bracket 11. For example, a midpoint is taken in the length direction of the bottom plate 111, and a cross section perpendicular to the bottom plate 111 is made at the midpoint. The left and right ends of the bracket 11 may be mirror-symmetrical about the cross section. Furthermore, the generated cross section may be the symmetry plane S.

Optionally, please refer to FIG. 4 and FIG. 6 , the side baffle 112 is close to the symmetry plane S, and has another side baffle 112 symmetrically corresponding to the symmetry plane S, which can be specifically divided into a left baffle 112A and a right baffle 112B. Therefore, the left baffle 112A and the right baffle 112B are arranged opposite to each other in the length direction of the bottom plate 111. The left baffle 112A is bent and extended along the thickness direction of the bottom plate 111 and away from the side of the right baffle 112B, and the right baffle 112B is bent and extended along the thickness direction of the bottom plate 111 and away from the side of the left baffle 112A. The bottom plate 111, the left baffle 112A and the right baffle 112B enclose a receiving space 113, and the receiving space 113 is used to accommodate the explosion-proof valve bracket 12.

Optionally, please refer to FIG. 4 and FIG. 5 , the mounting member 13 is divided into a positive mounting member 13A and a negative mounting member 13B, both of which are connected to the bracket 11, and the positive mounting member 13A and the negative mounting member 13B are arranged opposite to each other in the length direction of the bottom plate 111, and the symmetry plane S is located between the positive mounting member 13A and the negative mounting member 13B. Therefore, the following description of the mounting member 13 can be considered as a structure shared by the positive mounting member 13A and the negative mounting member 13B.

Optionally, please refer to Figure 4, the mounting member 13 includes a top plate 131 and a first side plate 132 connected at an angle, the top plate 131 and the bottom plate 111 are relatively spaced apart, and the first side plate 132 and the side baffle plate 112 are relatively spaced apart to form a first air duct 114.

Optionally, the mounting member 13 may be made of plastic material, such as PP (polypropylene) or PPE (thermoplastic engineering plastic). The mounting member 13 is generally plate-shaped, and the plate surface is generally rectangular.

Optionally, please refer to Figure 4, the mounting member 13 includes a top plate 131 and a first side plate 132 connected at an angle, and the top plate 131 and the bottom plate 111 are arranged at a relative interval. The top plate 131 can be in the shape of a plate, and the plate surface is rectangular. The length direction, width direction and thickness direction of the top plate 131 are consistent with the length direction, width direction and thickness direction of the aforementioned bottom plate 111. The first side plate 132 can be in the shape of a plate, a strip, a block, etc., without limitation. The angle between the first side plate 132 and the top plate 131 can be 90°. The first side plate 132 and the top plate 131 can be an integral structure, for example, integrally formed by an injection molding process. The first side plate 132 is arranged at one end of the top plate 131 close to the side baffle 112 in the length direction of the top plate 131.

Optionally, the first side plate 132 is opposite to the end of the side baffle 112 away from the bottom plate 111 and has a spacing therebetween to form a first air passage 114. As can be seen from FIG4 , the first side plate 132 and the side baffle 112 have a spacing therebetween in the length direction of the bottom plate 111. The first air passage 114 is in communication with the above-mentioned accommodation space 113, and air flows into the accommodation space 113 through the first air passage 114.

Optionally, the cover plate 14 is connected to the top plate 131 and is located on the side of the top plate 131 facing away from the bottom plate 111. The cover plate 14 may also be in the shape of a plate with a rectangular surface. The length, width and thickness directions of the top plate 131 are consistent with the length, width and thickness directions of the aforementioned bottom plate 111.

Optionally, referring to FIG. 4 , the cover plate 14 is opposite to the end of the side baffle plate 112 away from the bottom plate 111 and has a spacing therebetween to form a second air passage 115. As can be seen from FIG. 4 , the cover plate 14 and the side baffle plate 112 have a spacing therebetween in the thickness direction of the bottom plate 111. The second air passage 115 connects the first air passage 114 and the accommodation space 113, and air flows into the accommodation space 113 through the first air passage 114 and the second air passage 115 in sequence.

By designing the bottom plate 111 and the mirror-symmetrical side baffles 112, a accommodating space 113 can be enclosed, and the explosion-proof valve bracket 12 can be accommodated in the accommodating space 113, so that the explosion-proof valve bracket 12 can be protected by being wrapped by the bottom plate 111 and the side baffles 112; and, a first air channel 114 is formed between the first side plate 132 and the side baffle 112, and a second air channel 115 is formed between the cover plate 14 and the side baffle 112. The first air channel 114 and the second air channel 115 are connected to the accommodating space 113 mentioned above, so that air can gather to the accommodating space 113 through the air channel, thereby improving the effect of gathering gas under the end cover assembly 10 and the explosion-proof valve, ensuring that the explosion-proof valve can produce corresponding effects, and further improving the life and safety performance of the energy storage device 100.

In one embodiment, referring to FIG. 4 , the side baffle 112 extends along the thickness direction of the bottom plate 111 and on the side opposite to the symmetry plane S. The side baffle 112 includes a first bending section 1121, a second bending section 1122, and a third bending section 1123 connected in sequence. The ratio of the first bending section 1121: the second bending section 1122: the third bending section 1123 is (2-3.5): (1.2-1.8): 1. By setting a winding gas path with a surface tortuosity from small to large, the gas flow is smoother.

In one embodiment, please refer to Figures 5 to 7, the bracket 11 also includes a first side panel 116 and a protrusion 117, the side baffle 112, the bottom plate 111 and the protrusion 117 are connected on the same side of the first side panel 116, the protrusion 117 is located on the side of the side baffle 112 away from the bottom plate 111, and the protrusion 117 is close to the symmetry plane S; the mounting member 13 includes a second side panel 133, the second side panel 133 is respectively connected to the bottom plate 111 and the first side panel 132 at an angle, the second side panel 133 is arranged opposite to the first side panel 116, the second side panel 133 is provided with a mating groove 1331 extending to the top plate 131, and the protrusion 117 is matingly connected to the mating groove 1331.

Specifically, the first side plate 116 may be plate-shaped, and the plate surface is generally concave. The first side plate 116 may be connected to the bottom plate 111 at an angle, and optionally, the connection angle between the first side plate 116 and the bottom plate 111 may be 90°. The first side plate 116 extends along the thickness direction of the bottom plate 111, and the side baffle 112 and the bottom plate 111 are connected to the same side of the first side plate 116, and the side baffle 112, the bottom plate 111 and the first side plate 116 together enclose the above-mentioned accommodation space 113.

Optionally, the protrusion 117 is also connected to the first side plate 116 and is on the same side as the bottom plate 111. The protrusion 117 is located on the side of the first side plate 116 away from the bottom plate 111 in the thickness direction of the bottom plate 111, that is, the protrusion 117 is located on the side of the side baffle 112 away from the bottom plate 111. The protrusion 117 is close to the symmetry plane S, and has another symmetrical protrusion 117 corresponding to the symmetry plane S, which can be specifically divided into a left protrusion 117A and a right protrusion 117B. Therefore, the left protrusion 117A and the right protrusion 117B are arranged opposite to each other in the length direction of the bottom plate 111. The protrusion 117 is used to dock with the mounting member 13.

Optionally, the second side plate 133 may be plate-shaped, the plate surface is a right-angled trapezoid, and the right-angled side of the second side plate 133 may be connected to the first side plate 132, and the long bottom side is connected to the top plate 131. The angle between the second side plate 133 and the top plate 131 may be 90°, and the angle between the second side plate 133 and the first side plate 132 may also be 90°. The second side plate 133 is arranged at one end of the top plate 131 in the width direction of the top plate 131 close to the first side plate 116. Preferably, the second side plate 133 is arranged opposite to the first side plate 116, and the second side plate 133 and the first side plate 116 may be in contact.

Optionally, a mating groove 1331 may be provided at a position of the second side plate 133 near the top plate 131, and the mating groove 1331 may extend upward to the top plate 131 and penetrate the thickness direction of the top plate 131. The protrusion 117 extends into the mating groove 1331, so as to achieve the docking of the protrusion 117 with the mounting member 13. It can be understood that the top plate 131 should also be located on the same side of the protrusion 117 and the bottom plate 111 on the first side plate 116, and the top plate 131 will not protrude from the first side plate 116 in the thickness direction, that is, the top plate 131 can be at the same height as the first side plate 116. In this way, after the mating groove 1331 extends to the top plate 131, the mating groove 1331 can be mated with the protrusion 117 located at the edge of the first side plate 116.

Optionally, the plane where the top plate 131 is located may coincide with the plane where the protrusion 117 is located. Therefore, it can be understood that the matching groove 1331 can also be considered as a gap formed on the top plate 131, and the protrusion 117 is used to fill the gap.

Optionally, the matching groove 1331 does not extend to the first side plate 132 , so the matching groove 1331 maintains a distance from the first side plate 132 .

It is understandable that since the protrusion 117 is also located on the same side of the side baffle 112, in order to make the protrusion 117 and the matching groove 1331 cooperate and dock, the protrusion 117 should also be located at the end of the side baffle 112 away from the symmetry plane S and have a spacing distance from the side baffle 112.

By designing a protrusion 117 on the bracket 11 and a matching groove 1331 on the mounting member 13, the protrusion 117 can be matched and docked with the matching groove 1331, thereby improving the connection stability between the bracket 11 and the mounting member 13; at the same time, the protrusion 117 can also be mirror-symmetrical about the symmetry plane S, so that the protrusion 117 can cooperate with the mounting member 13 to support the middle part of the end cover assembly 10 and prevent the middle part of the end cover assembly 10 from falling.

In one embodiment, please refer to FIG. 4 , the spacing distance H1 between the end of the side baffle 112 away from the bottom plate 111 and the cover plate 14 is 0.01 mm to 0.95 mm. Specifically, there is still a spacing distance between the side baffle 112 and the bottom plate 111 at the position closest to the bottom plate 111, that is, the size of the second air duct 115 in the thickness direction of the bottom plate 111 is 0.01 mm to 0.95 mm. The specific size of the spacing distance H1 can be 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, and 0.75 mm. Designing the above spacing distance H1 within this range is conducive to the gas flowing to the accommodating space 113 through the second air duct 115, and can prevent other foreign objects from passing through the air duct. When the spacing distance H1 is smaller than the above range, the spacing size is too small to form an airway for free flow of gas; when the spacing distance H1 is larger than the above range, the spacing size is too large, and foreign matter in the end cover assembly 10 can also easily flow through the airway, such as broken pole ears or insulating films, which can easily drift into the accommodating space 113 along the direction of the airflow, causing the explosion-proof valve to fail.

In one embodiment, please refer to FIG6 , the side of the protrusion 117 close to the symmetry plane S and the side baffle 112 have a spacing distance H2 of 1.5 mm to 4.5 mm in the length direction of the bottom plate 111. Specifically, based on the above embodiment, the protrusion 117 and the matching groove 1331 form a matching docking, so the protrusion 117 and the side baffle 112 have a spacing distance. Taking FIG6 as an example, the protrusion 117 should be located on the left side of the side baffle 112, and the symmetry plane S is located on the right side of the side baffle 112. Therefore, the side of the protrusion 117 close to the symmetry plane S is the side of the protrusion 117 closest to the side baffle 112, and the first side plate 132 is located between the protrusion 117 and the side baffle 112. The specific size of the spacing distance H2 can be 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm. By designing the above-mentioned spacing distance H2 within this range, the gap between the edges of the two sides of the side baffle 112 and the mounting member 13 closest to the explosion-proof valve bracket 12 can be ensured, and sufficient space can be ensured between the first side plate 132 and the side baffle 112 to form the first airway 114; at the same time, it is also convenient for the protrusion 117 to be snap-fitted and assembled with the matching groove 1331, and a matching margin is designed. When the spacing distance H2 is smaller than the above-mentioned range, the spacing size is too small to form an airway for free flow of gas; when the spacing distance H2 is larger than the above-mentioned range, the spacing size is too large, and foreign matter in the end cover assembly 10 is also easy to flow through the airway, such as broken pole ears or insulating films, which are easy to drift into the accommodating space 113 along the airflow direction, making the explosion-proof valve ineffective.

In one embodiment, the orthographic projection of the protrusion 117 on the bottom plate 111 is a trapezoid, the end of the protrusion 117 away from the first side plate 116 is the short top side of the trapezoid, and the end of the protrusion 117 connected to the first side plate 116 is the long bottom side of the trapezoid. Specifically, the orthographic projection of the protrusion 117 on the bottom plate 111 is a trapezoid, which can be a regular trapezoid. In addition, the longer bottom side of the protrusion 117 can be connected to the first side plate 116, so the protrusion 117 is a constricted shape in the direction away from the first side plate 116.

Optionally, the orthographic projection of the protrusion 117 on the bottom plate 111 may also be a hexagon. For example, the original shape of the protrusion 117 may be a quadrilateral, and then the two end corners away from the first side plate 116 may be chamfered to form a hexagon.

By arranging the protrusion 117 on the bracket 11 and the orthographic projection of the protrusion 117 on the bottom plate 111 being a trapezoid, the smoothness of the protrusion 117 and the mounting member 13 when docking is facilitated, thereby improving the reliability of the end cover assembly 10 during assembly.

In one embodiment, please refer to FIG. 6 and FIG. 7 , the ratio D1:H3 of the depth D1 of the matching groove 1331 and the height H3 of the protrusion 117 relative to the first side plate 116 is 1.15 to 3.85. Specifically, the depth D1 of the matching groove 1331 can be considered as the extension depth in the width direction of the top plate 131. When D1:H3 is in the range of 1.15 to 3.85, it can be considered that the depth D1 of the matching groove 1331 is greater than the height H3 of the protrusion 117. Therefore, after the protrusion 117 extends into the matching groove 1331, there is still a spacing distance between the end of the protrusion 117 away from the first side plate 116 and the top plate 131 in the width direction. The specific size of D1:H3 can be 1.2, 1.24, 1.26, 1.28, 1.30. By designing the ratio of the depth D1 of the matching groove 1331 to the height H3 of the protrusion 117 to be greater than 1, it can be ensured that the protrusion 117 can be completely inserted into the matching groove 1331.

In one embodiment, please refer to FIG. 8 , the projection 117 is connected to at least two adjacent surfaces of the second side plate 133 through an arc surface. Specifically, the projection 117 may include a top surface 1172 facing away from the first side plate 116, a lower surface 1171 facing the bottom plate 111, and two opposite bevel surfaces 1173. Among them, the lower surface 1171 is respectively connected to the top surface 1172 and the two bevel surfaces 1173, and the bevel surfaces 1173 are the surfaces formed by the isosceles bevels of the projection 117. It can be understood that after the projection 117 is inserted, the lower surface 1171 and the two bevel surfaces 1173 can be connected to the second side plate 133. Therefore, the connection between the lower surface 1171 and the two bevel surfaces 1173 can be formed into an arc surface connection. Of course, the lower surface 1171 and the top surface 1172 can also be connected by an arc surface. By designing the protrusion 117 to have an arc surface connection, the protrusion 117 can be easily inserted into the matching groove 1331, thereby reducing the resistance during the insertion of the protrusion 117.

In one embodiment, referring to FIG. 8 , a first inclined surface (not shown) is provided between the end surface of the protrusion 117 facing away from the first side plate 116 and the surface facing the bottom plate 111 , and a corresponding second inclined surface 1332 is provided at the opening of the matching groove 1331 .

Specifically, the protrusion 117 includes the top surface 1172 facing away from the first side plate 116, and the lower surface 1171 facing the bottom plate 111. The top surface 1172 and the lower surface 1171 can be connected by a first inclined surface (not shown in the figure). It can be understood that the first inclined surface has an angle with the top surface 1172 and the lower surface 1171.

Optionally, the second side plate 133 includes a side surface facing the first side plate 116, and a mating surface enclosing the mating groove 1331. The mating surface may be parallel to the plane where the top plate 131 is located. The side surface and the mating surface are connected by a second inclined surface 1332. It can be understood that the second inclined surface 1332 has an angle with both the side surface and the mating surface.

When the protrusion 117 is inserted into the matching groove 1331 , the first inclined surface 1332 and the second inclined surface 1332 are parallel to and in contact with each other.

By designing the protrusion 117 to have a first inclined surface and the opening of the matching groove 1331 to have a second inclined surface 1332 , the protrusion 117 can be smoothly inserted through the matching of the inclined surfaces, thereby improving the speed of installation and insertion of the protrusion 117 .

In one embodiment, please refer to Figures 4, 6 and 7, the bracket 11 also includes a first clip 118, the first clip 118 is connected to the first side plate 116, and the first clip 118 is located at the end of the protrusion 117 away from the symmetry plane S; the mounting member 13 also includes a clamping plate 134 on the same plane as the second side plate 133, the clamping plate 134 is provided with a first clamping hole 1341 opposite to the first clamping hole 1348, and the first clamping plate 118 passes through the first clamping hole 1348 to be connected to the clamping plate 134.

Specifically, the first buckle 118 protrudes from the surface of the first side plate 116 and is located at the end of the protrusion 117 away from the symmetry plane S. The first buckle 118 can be a "1"-shaped buckle, which is used to fix the mounting member 13. The first buckle 118 is close to the symmetry plane S, and has another first buckle 118 symmetrically corresponding to the symmetry plane S, which can be specifically divided into a first left buckle 118A and a first right buckle 118B. Therefore, the first left buckle 118A and the first right buckle 118B are arranged opposite to each other in the length direction of the bottom plate 111.

Optionally, the first buckles 118 are located at two opposite ends of the first side plate 116 .

Optionally, the mounting member 13 further includes a clamping plate 134 on the same plane as the second side plate 133, and a second side plate 132S arranged opposite to the first side plate 132 in the length direction of the top plate 131. The clamping plate 134 may be plate-shaped, and the plate surface may be rectangular. The second side plate 132S is located at the end of the top plate 131 away from the first side plate 132, and the second side plate 132S is connected to the clamping plate 134 at an angle. Optionally, the angle between the second side plate 132S and the clamping plate 134 may be 90°.

Optionally, the first clamping hole 1341 passes through two opposite sides of the clamping plate 134, so that the first buckle 118 can pass through to form a mating connection.

Optionally, the first clamping hole 1341 is provided so that the clamping plate 134 forms a square ring shape.

By providing the first clip 118 on the bracket 11 and opening the first clip hole 1341 on the mounting member 13, it is advantageous to fix the bracket 11 and the mounting member 13 to each other through the first clip 118; and the first clip 118 can be mirror-symmetrical about the symmetry plane S, so that there are two stacked first clips 118 on the bracket 11. Through the clipping of the two first clips 118, even when the bracket 11 is broken, the first clip 118 can still clip the mounting member 13, thereby improving the stability and thus increasing the service life of the energy storage device.

In one embodiment, referring to Figures 6 and 9, the end of the first buckle 118 away from the first side plate 116 has a third inclined surface 1181, and the opening of the first clamping hole 1341 has a corresponding fourth inclined surface 1346. Specifically, since the first buckle 118 can be a "1"-shaped buckle, there is at least one third inclined surface 1181 at the end of the first buckle 118 away from the first side plate 116, and the third inclined surface 1181 can have an angle with the plane where the first side plate 116 is located.

Optionally, the side of the clamping plate 134 facing the first side plate 116 should be a fourth inclined surface 1346. For example, based on the square ring shape of the clamping plate 134 in the above embodiment, the clamping plate 134 can be specifically divided into a relative upper side strip 1344 and a lower side strip 1345, and a relative left side strip 1342 and a right side strip 1343. The left side strip 1342 can be connected to the second side plate 132S, and the upper side strip 1344 can be connected to the top plate 131. The fourth inclined surface 1346 can be located on the right side strip 1343. The fourth inclined surface 1346 is inclined from the side close to the second side plate 132S to the direction in which the first buckle 118 is inserted.

Optionally, when the first buckle 118 is inserted, the third inclined surface 1181 and the fourth inclined surface 1346 are parallel to and in contact with each other.

By providing the third inclined surface 1181 on the first buckle 118 and the fourth inclined surface 1346 at the first clamping hole 1341, the first buckle 118 can be smoothly inserted through the cooperation of the inclined surfaces, thereby improving the speed of installation and insertion of the first buckle 118.

In one embodiment, please refer to Figures 9 and 10, the clamping plate 134 includes a first surface 1347 and a second surface 1348 opposite to each other, the first surface 1347 faces the first side plate 116, and the first clamping hole 1341 passes through from the first surface 1347 to the second surface 1348, and the first clamping hole 1341 is in a constricted shape from the first surface 1347 to the second surface 1348.

Specifically, in order to make the first clamping hole 1341 have a constricted shape from the first surface 1347 to the second surface 1348, at least four inclined surfaces may be formed on the clamping plate 134. For example, on the basis that the right side bar 1343 has the fourth inclined surface 1346 in the above embodiment, the left side bar 1342, the upper side bar 1344 and the lower side bar 1345 may all have inclined surfaces, and all are inclined along the direction of insertion of the first buckle 118. In this way, the first clamping hole 1341 may have a constricted shape from the first surface 1347 to the second surface 1348.

The first latch hole 1341 is designed to be in a tapered shape from the first surface 1347 to the second surface 1348 so that all four sides of the first latch hole 1341 can be inclined to guide the first buckle 118, making it easier for the first buckle 118 to be inserted and fastened.

In one implementation, referring to FIG. 10 , the mounting member 13 further includes a convex rib 135 , the convex rib 135 connects the second surface 1348 and the top plate 131 , and extends in a direction away from the first surface 1347 .

Specifically, the rib 135 may be connected to the right side strip 1343 and extend in a direction away from the first surface 1347 .

Optionally, the first buckle 118 may include an extension portion and a protrusion portion, wherein the extension portion is a "1"-shaped straight line portion, and the protrusion portion is a portion protruding from the side of the extension portion. After the first buckle 118 is inserted into the first clamping hole 1341, the protrusion portion can hook the rib 135, so that the rib 135 is located between the protrusion portion and the right side bar 1343.

By providing a convex rib 135 on one side of the clamping plate 134, the structural strength of the clamping plate 134 can be increased to prevent the clamping plate 134 from bending and deformation. At the same time, the convex rib 135 can also be used to protect the end of the first buckle 118 to prevent accidental tripping and improve the stability of the connection of the first buckle 118, thereby improving the service life of the energy storage device 100.

In one embodiment, please refer to Figure 11, the top plate 131 includes a first boss portion 136 and a second boss portion 137 connected to each other, the first boss portion 136 protrudes from the plane where the top plate 131 is located in a direction away from the bottom plate 111, and the second boss portion 137 is located at an end of the first boss portion 136 away from the bottom plate 111, and a ring step is formed at the connection between the first boss portion 136 and the second boss portion 137.

Specifically, the first boss portion 136 is annular and protrudes upward from the plane where the top plate 131 is located. The second boss portion 137 is also annular and protrudes upward from the second boss portion 137. The first boss portion 136 and the second boss portion 137 can enclose a pole space 138 for accommodating the pole. Optionally, the pole is made of metal, and the pole includes a positive pole and a negative pole. The material of the positive pole is, for example, aluminum, and the material of the negative pole is, for example, copper or a copper-aluminum composite material. The positive pole is used to be electrically connected to the positive ear of the electrode assembly, and the negative pole is used to be electrically connected to the negative ear of the electrode assembly. The positive pole is located in the space enclosed by the positive electrode mounting member 13A, and the negative pole is located in the space enclosed by the negative electrode mounting member 13B.

Optionally, the cross-sectional shape of the first boss portion 136 along the plane parallel to the top plate 131 can be a square or an ellipse. The cross-sectional shape of the second boss portion 137 along the plane parallel to the top plate 131 can be a square or an ellipse. In addition, the outer peripheral size of the second boss portion 137 should be larger than the outer peripheral size of the first boss portion 136 (not shown in the figure). It can be understood that the outer peripheral sizes of the first boss portion 136 and the second boss portion 137 are different in order to facilitate the formation of a snap connection when the top plate 131 and the cover plate 14 are docked, thereby increasing the connection strength and sealing performance of the top plate 131 and the cover plate 14. Therefore, in other embodiments, the outer peripheral size of the second boss portion 137 can also be smaller than the outer peripheral size of the first boss portion 136. In this way, a ring step can be formed at the connection between the first boss portion 136 and the second boss portion 137.

By forming the first boss portion 136 and the second boss portion 137 on the top plate 131, and the first boss portion 136 and the second boss portion 137 are combined to form an annular step, it is beneficial to improve the sealing performance between the mounting member 13 and the cover plate 14, thereby improving the safety performance of the energy storage device; at the same time, it is also convenient for the top plate to be clamped and positioned when it is installed from the bottom to the top of the cover plate 14, thereby reducing the difficulty of assembly.

In one embodiment, please refer to FIG. 10 and FIG. 11 , the second boss portion 137 is provided with a pole hole 139, and the pole hole 139 is in a constricted shape from the bottom plate 111 toward the top plate 131. Specifically, the second boss portion 137 is provided with a pole hole 139 that penetrates the thickness direction, so that the pole space 138 is connected to the outside through the pole hole 139. After the pole is accommodated in the pole space 138, the pole hole 139 is closed so that the gas cannot leak from the pole hole 139, thereby ensuring the sealing of the internal space of the energy storage device 100.

Optionally, the pole is further connected to a sealing ring. After the pole is located in the pole space 138, the pole contacts the edge forming the pole hole 139 through the sealing ring.

By designing the pole hole 139 to be a tapered shape, the flange portion of the sealing ring is compressed and deformed to extend outward during the pole pressing process, and abuts against the pole hole, thereby filling the gap in the pole hole 139. The abutment surface between the flange portion of the sealing ring and the side wall of the pole hole becomes larger, further improving the sealing performance, thereby improving the safety performance of the energy storage device.

In one embodiment, please refer to Figures 4 to 6, the end cover assembly 10 also includes an explosion-proof valve bracket 12, and the bracket 11 also includes a second clip 119, the second clip 119 is connected to the first side plate 116, and the second clip 119 is located between the protrusion 117 and the symmetry plane S; the explosion-proof valve bracket 12 is provided with a second clip hole 121, and the second clip 119 is connected to the explosion-proof valve bracket 12 through the second clip hole 121, and the height of the second clip 119 protruding relative to the first side plate 116 is greater than the height of the first clip 118 protruding relative to the first side plate 116.

Specifically, the second buckle 119 protrudes from the surface of the first side plate 116 and is located at one end of the protrusion 117 close to the symmetry plane S. The second buckle 119 can be located in the accommodating space 113. The second buckle 119 can be a "1"-shaped buckle, which is used to fix the explosion-proof valve bracket 12. The second buckle 119 is close to the symmetry plane S, and has another second buckle 119 symmetrically corresponding to the symmetry plane S, which can be specifically divided into a second left buckle 119A and a second right buckle 119B. Therefore, the second left buckle 119A and the second right buckle 119B are arranged relatively in the length direction of the bottom plate 111.

Optionally, the explosion-proof valve bracket 12 is located between the bottom plate 111 and the cover plate 14 , and the explosion-proof valve bracket 12 is connected to the cover plate 14 .

Optionally, the explosion-proof valve bracket 12 may include a baffle 122, a first connecting plate 123 and a second connecting plate 124. The baffle 122 is opposite to the bottom plate 111 and the cover plate 14. The first connecting plate 123 and the second connecting plate 124 are respectively connected to both ends of the baffle 122 in the length direction. The first connecting plate 123 and the second connecting plate 124 are also used to connect to the cover plate 14.

Optionally, the explosion-proof valve bracket 12 may also be a mirror-symmetrical structure, and the symmetrical surface may be the same as the symmetrical surface S of the bracket 11 in the above embodiment, that is, the first connecting plate 123 and the second connecting plate 124 are mirror-symmetrically arranged. The cross-sectional shape of the explosion-proof valve bracket 12 along the thickness direction of the bottom plate 111 is roughly "J"-shaped. It can be understood that the first connecting plate 123 and the second connecting plate 124 in the above can both be bent plates.

Optionally, the number of the second clamping holes 121 can be two, one on the first connecting plate 123 and the second connecting plate 124. Since the explosion-proof valve bracket 12 is mirror-symmetrical, taking the first connecting plate 123 as an example, the fixing holes penetrate the two opposite sides of the connecting plate, and at least part of the buckle extends into the fixing holes to connect and fix with the first connecting plate 123.

By arranging the second buckle 119 on the bracket 11 and opening the second buckle hole 121 on the explosion-proof valve bracket 12, it is beneficial to fix the bracket 11 and the explosion-proof valve bracket 12 to each other through the second buckle 119; and the advantage of the second buckle 119 being longer than the first buckle 118 is that when fastening, the second buckle 119 in the middle area can be fastened first, and then the first buckles 118 at both ends can be fastened, thereby reducing the difficulty of fastening the buckles at the same time and reducing the requirements for assembly operation accuracy.

In one implementation, referring to FIG. 3 and FIG. 5 , the end cover assembly 10 includes two brackets 11 , the two brackets 11 are mirror-symmetrical, and the mounting member 13 is located between the two brackets 11 .

Specifically, the number of the brackets 11 in the end cap assembly 10 can be two, namely a first bracket 11A and a second bracket 11B. The first bracket 11A and the second bracket 11B are mirror-symmetrical. Therefore, the first bracket 11A and the second bracket 11B both have all the features of the bracket 11 described in the above embodiment.

Optionally, the first bracket 11A encloses a first accommodating space, and the second bracket 11B encloses a second accommodating space, and the accommodating spaces of the two together constitute an accommodating space 113 , and the explosion-proof valve bracket 12 mentioned above is accommodated in the accommodating space 113 .

The number of molds for bracket production is reduced, and the assembly rate of bracket parts is increased, thereby reducing production costs. The mirror bracket 11 is designed to be two mirror-symmetrical brackets, and the mounting member 13 is located between the two brackets 11. The bracket 11 can be effectively used to fix the mounting member 13, and the two fixed ends are subjected to the same force, so there will be no problem of deformation of the mounting member 13.

Based on the bracket 11, end cover assembly 10 and energy storage device 100 of the aforementioned embodiment of the present application, the embodiment of the present application also provides an electrical device, including the energy storage device 100 in the embodiment of the present application, and the energy storage device 100 is used to supply power to the electrical device.

In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or original referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

What is disclosed above is only a preferred embodiment of the present application, and it certainly cannot be used to limit the scope of the claims of the present application. A person of ordinary skill in the art can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims (15)

1. An end cap assembly (10), used for an energy storage device (100), characterized by comprising: A bracket (11), comprising a bottom plate (111) and a side baffle (112), the bottom plate (111) and the side baffle (112) being connected, the side baffle (112) extending along the thickness direction of the bottom plate (111), the bracket (11) presenting a plane-symmetrical structure relative to a symmetry plane (S), the symmetry plane (S) being perpendicular to a plane where the bottom plate (111) is located, the side baffle (112) being close to the symmetry plane (S), and the bottom plate (111) and the side baffle (112) enclosing a receiving space (113); The mounting member (13) comprises a top plate (131) and a first side plate (132) connected at an angle, the top plate (131) and the bottom plate (111) being arranged relative to each other and spaced apart, and the first side plate (132) and the side baffle plate (112) being arranged relative to each other and spaced apart from each other, so as to form a first air passage (114); a cover plate connected to the top plate (131) and located on a side of the top plate (131) facing away from the bottom plate (111), the cover plate being spaced apart from the side baffle plate (112) to form a second air channel (115), the second air channel (115) being respectively connected to the first air channel (114) and the accommodating space (113); A spacing distance H1 between one end of the side baffle (112) away from the bottom plate (111) and the cover plate is 0.55 mm to 0.95 mm; The bracket (11) further comprises a first side plate (116) and a protrusion (117); the side baffle (112), the bottom plate (111) and the protrusion (117) are connected on the same side of the first side plate (116); the protrusion (117) is located on the side of the side baffle (112) away from the bottom plate (111); and the protrusion (117) is close to the symmetry plane (S); the mounting member (13) comprises a second side plate (133); the second side plate (133) is respectively connected to the bottom plate (111) and the first side plate (132) at an angle; the second side plate (133) is arranged opposite to the first side plate (116); the second side plate (133) is provided with a matching groove (1331) extending to the top plate (131) and penetrating the top plate (131); the protrusion (117) is matched and connected to the matching groove (1331); A distance H2 between the side of the protrusion (117) close to the symmetry plane (S) and the side baffle (112) in the length direction of the bottom plate (111) is 2 mm to 4.5 mm; The ratio D1:H3 of the depth D1 of the matching groove (1331) to the protruding height H3 of the protrusion (117) relative to the first side plate (116) is 1.15-1.3. 2. The end cover assembly (10) according to claim 1, characterized in that the side baffle (112) extends along the thickness direction of the bottom plate (111) and on a side facing away from the symmetry plane (S), and the side baffle (112) comprises a first bending section (1121), a second bending section (1122) and a third bending section (1123) connected in sequence, and the ratio of the first bending section (1121): the second bending section (1122): the third bending section (1123) is (2-3.5): (1.2-1.8): 1. 3. The end cover assembly (10) according to claim 1, characterized in that the orthographic projection of the protrusion (117) on the bottom plate (111) is a trapezoid, the end of the protrusion (117) away from the first side plate (116) is the short top side of the trapezoid, and the end of the protrusion (117) connected to the first side plate (116) is the long bottom side of the trapezoid. 4. The end cover assembly (10) according to claim 1, characterized in that at least two adjacent surfaces of the protrusion (117) connected to the second side plate (133) are connected via an arc surface. 5. The end cover assembly (10) according to claim 1 is characterized in that a first inclined surface is provided between the end surface of the protrusion (117) facing away from the first side plate (116) and the surface facing the bottom plate (111), and a corresponding second inclined surface (1332) is provided at the opening of the matching groove (1331). 6. The end cover assembly (10) according to claim 1 is characterized in that the bracket (11) further comprises a first clip (118), the first clip (118) is connected to the first side plate (116), and the first clip (118) is located at an end of the protrusion (117) away from the symmetry plane (S); the mounting member (13) further comprises a clamping plate (134) on the same plane as the second side plate (133), the clamping plate (134) is provided with a first clamping hole (1341) opposite to the first clip (118), and the first clip (118) passes through the first clamping hole (1341) to be connected to the clamping plate (134). 7. The end cover assembly (10) according to claim 6, characterized in that an end of the first buckle (118) away from the first side plate (116) has a third inclined surface (1181), and an opening of the first clamping hole (1341) has a corresponding fourth inclined surface (1346). 8. The end cover assembly (10) according to claim 6, characterized in that the clamping plate (134) comprises a first surface (1347) and a second surface (1348) opposite to each other, the first surface (1347) faces the first side plate (116), the first clamping hole (1341) penetrates from the first surface (1347) to the second surface (1348), and the first clamping hole (1341) is in a narrowed shape in the direction from the first surface (1347) to the second surface (1348). 9. The end cover assembly (10) according to claim 8, characterized in that the mounting member (13) further comprises a convex rib (135), wherein the convex rib (135) connects the second surface (1348) and the top plate (131) and extends in a direction away from the first surface (1347). 10. The end cover assembly (10) according to claim 1 is characterized in that the top plate (131) comprises a first boss portion (136) and a second boss portion (137) connected to each other, the first boss portion (136) protruding from a plane where the top plate (131) is located in a direction away from the bottom plate (111), the second boss portion (137) is located at an end of the first boss portion (136) away from the bottom plate (111), and a ring step is formed at the connection between the first boss portion (136) and the second boss portion (137). 11. The end cover assembly (10) according to claim 10, characterized in that the second boss portion (137) is provided with a pole hole (139), and the hole diameter of the pole hole (139) close to the bottom plate is larger than the hole diameter away from the bottom plate. 12. The end cover assembly (10) according to claim 6, characterized in that the end cover assembly (10) further comprises an explosion-proof valve bracket (12), the bracket (11) further comprises a second buckle (119), the second buckle (119) is connected to the first side plate (116), and the second buckle (119) is located between the protrusion (117) and the symmetry plane (S); the explosion-proof valve bracket (12) is provided with a second buckle hole (121), the second buckle (119) passes through the second buckle hole (121) and is connected to the explosion-proof valve bracket (12), and the height of the second buckle (119) protruding relative to the first side plate (116) is greater than the height of the first buckle (118) protruding relative to the first side plate (116). 13. The end cover assembly (10) according to claim 1, characterized in that the end cover assembly (10) comprises two brackets (11), the two brackets (11) are mirror-symmetrical, and the mounting member (13) is located between the two brackets (11). 14. An energy storage device (100), characterized in that the energy storage device (100) comprises an electrode assembly (20), a shell (30), and an end cap assembly (10) according to any one of claims 1 to 13, wherein the electrode assembly (20) is arranged in the shell (30), and the end cap assembly (10) is electrically connected to the electrode assembly (20). 15. An electrical device, characterized in that the electrical device comprises the energy storage device (100) according to claim 14, and the energy storage device (100) supplies power to the electrical device.