CN116799447B

CN116799447B - Lower plastic, end cover assembly, energy storage device and electric equipment

Info

Publication number: CN116799447B
Application number: CN202311032233.5A
Authority: CN
Inventors: 李茂松
Original assignee: Shenzhen Haichen Energy Storage Control 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: 2023-08-16
Filing date: 2023-08-16
Publication date: 2023-11-03
Anticipated expiration: 2043-08-16
Also published as: CN116799447A

Abstract

The lower plastic is of an integrally molded structure through injection molding, and comprises a main body plate, an explosion-proof boss and a plurality of first pushing points, wherein the main body plate comprises a first surface and a second surface which are opposite to each other, the explosion-proof boss is convexly arranged on the second surface and is used for corresponding to an explosion-proof valve, and the top surface of the explosion-proof boss, which is convexly arranged on the second surface, is a third surface; the first pushing points are arranged on the third surface and are mutually spaced, and the ventilation holes are positioned among the first pushing points, wherein the first pushing points are respectively arranged in a row along the width direction of the main body plate on two sides of the second central line, and the distances between the first pushing points in two rows and the second central line are equal. The plastic mold can realize uniform demolding, can carry out ejection operation after plastic molding, does not need to be completely cooled to room temperature in the mold and then demolded, improves the production efficiency, can avoid the mold from being repeatedly and greatly heated and cooled, and can improve the service life of the mold.

Description

Lower plastic, end cover assembly, energy storage device and electric equipment

Technical Field

The application relates to the technical field of energy storage, in particular to a lower plastic, an end cover assembly, an energy storage device and electric equipment.

Background

The secondary battery (Rechargeable battery) is also called a rechargeable battery or a storage battery, and is a battery that can be continuously used by activating an active material by charging after discharging the battery. The recyclable characteristic of the secondary battery gradually becomes a main power source of electric equipment, as the demand of the secondary battery gradually increases, the performance requirements of people on all aspects of the secondary battery are higher and higher, especially the energy density requirement of the battery unit volume, the thickness of the end cover component of the battery is an important parameter affecting the energy density of the battery unit volume, and the energy density of the battery unit volume is reduced when the end cover component is too thick. Current end cap assemblies include a lower plastic for insulation between the top cap and the pole, which is typically designed to be thin in order to increase the energy density per unit volume of the cell.

The lower plastic is usually required to be completely cooled for demolding during injection molding, and the production efficiency is low. In order to improve the production efficiency, when the lower plastic which is not completely cooled is demolded, the lower plastic is easy to generate deformation such as bending, twisting and the like, and the yield is low.

Disclosure of Invention

The application aims to provide lower plastic, an end cover assembly, an energy storage device and electric equipment, and solves the problems of low efficiency of injection molding and demolding of the lower plastic, deformation and low yield.

In order to achieve the purpose of the application, the application provides the following technical scheme:

in a first aspect, the present application provides a lower plastic for an end cap assembly of an energy storage device, the lower plastic being of an integrally molded structure by injection molding, the lower plastic comprising:

a body plate including first and second surfaces facing away from each other, the second surface being configured to face the electrode assembly, a center line extending in a length direction of the body plate being a first center line, and a center line extending in a width direction of the body plate being a second center line;

the explosion-proof boss is arranged on the second surface in a protruding mode and is used for corresponding to the explosion-proof valve, the top surface of the explosion-proof boss protruding out of the second surface is a third surface, the main body plate is provided with a vent groove, the vent groove extends from the first surface to the explosion-proof boss, the explosion-proof boss is provided with a plurality of vent holes, the vent holes extend from the third surface to the direction of the first surface, the vent groove is communicated with the plurality of vent holes, and the plurality of vent holes are symmetrical relative to the first central line and the second central line;

the first pushing points are arranged on the third surface and are arranged at intervals, the vent holes are located among the first pushing points, the first pushing points are arranged on two sides of the second center line in a row along the width direction of the main body plate, and the distances between the first pushing points and the second center line are equal.

By arranging a plurality of first pushing points which are arranged at intervals, the distance between the two rows of first pushing points and the second center line is equal, the explosion-proof boss can be subjected to uniform ejection force to achieve uniform demoulding, deformation such as bending and twisting caused by uneven stress is avoided, meanwhile, ejection operation can be carried out on the lower plastic after plastic molding, demoulding is not required after the lower plastic is completely cooled to room temperature in a mould, production efficiency is improved, repeated and large-scale heating and cooling of the mould can be avoided, and service life of the mould can be prolonged.

In one embodiment, the plurality of first pushing points include a first group of first pushing points and a second group of first pushing points, the first group of first pushing points and the second group of first pushing points each include two first pushing points arranged at intervals along the length direction of the main body plate, the first group of first pushing points and the second group of first pushing points are arranged at intervals in the width direction of the main body plate, the first group of first pushing points are close to the edge of the main body plate, a first group of first pushing points and a second group of second pushing points are respectively arranged at two sides of a first center line, and the first group of first pushing points and the second group of first pushing points at two sides of the first center line are symmetrical relative to the first center line. Through setting up two first push away the point of first group and two second to symmetry about first central line can promote the homogeneity of explosion-proof boss atress when drawing of patterns, is favorable to even drawing of patterns and forms the product of no deformation.

In one embodiment, the plurality of first pushing points further includes a third group of first pushing points, the third group of first pushing points includes two first pushing points arranged at intervals in the length direction of the main body board, two first pushing points in the third group are respectively located at two sides of the first center line, and the third group of first pushing points are located between the second group of first pushing points at two sides of the first center line. By arranging the third group of first pushing points, the distance between the two second groups of first pushing points is considered to be unsuitable for arranging too many first pushing points, so that the staggered third group of first pushing points is adopted, and the quantity of the first pushing points is reduced while the demolding uniformity is ensured.

In one embodiment, the lower plastic further includes a first boss and a second boss, where the first boss and the second boss are located at two ends of the main body plate in a length direction, and each of the first boss and the second boss protrudes from the second surface, the top surface of the first boss protruding from the second surface is a fourth surface, and the top surface of the second boss protruding from the second surface is a fifth surface; the lower plastic further comprises a plurality of second pushing points arranged on the second surface, the fourth surface and the fifth surface, and the second pushing points are symmetrical relative to the first midline and the second midline. Through setting up a plurality of second pushing points, can provide even ejection force for second surface, fourth surface and fifth surface when the drawing of patterns, realize even drawing of patterns.

In one embodiment, the fourth surface is provided with a plurality of first overflow holes arranged along the width direction of the main body plate, the plurality of second pushing points comprise a first group of second pushing points, the first group of second pushing points comprise two second pushing points which are in the same extending direction with the plurality of first overflow holes, the plurality of first overflow holes are positioned between the two second pushing points of the first group, and the distance between the edges of the first boss and the first group of second pushing points is 0.85mm-1.15mm; the second boss and the first boss are symmetrical relative to the first central line and the second central line, and the distance between the second pushing point on the fifth surface and the edge of the second boss is 0.85mm-1.15mm. The second pushing points are arranged at the four corners of the lower plastic, and the first boss and the second boss can be uniformly demoulded. The position of the first group of second pushing points is relatively centered, and structural deformation caused by too close to a structure generating morphology change during demolding is avoided.

In one embodiment, the second surface is further provided with reinforcing ribs in a protruding manner, the reinforcing ribs are located at the edges of the long sides of the main body plate, and two ends of the reinforcing ribs are respectively connected with the first boss and the explosion-proof boss; the second pushing points comprise a second group of second pushing points which are arranged on the second surface, the second group of second pushing points comprise a plurality of second pushing points which are distributed at intervals along the length direction of the main body plate, and the distance between the second pushing points and the reinforcing ribs is 1.25-1.85 mm. And a plurality of second pushing points are arranged, so that the uniformity of demolding can be improved. The second set of push points at this distance allows the reinforcement rib to be ejected with the body panel for demolding without having to provide additional push points on the reinforcement rib.

In one embodiment, the main body plate is further provided with a pole stand, the pole stand protrudes from the first surface, a pole groove is formed in the second surface at a position corresponding to the pole stand, a circular pole hole penetrating to the top surface of the pole stand is formed in the bottom wall of the pole groove, and the first central line intersects with the circle center of the pole hole; the plurality of second pushing points comprise a third group of second pushing points arranged on the second surface, the third group of second pushing points comprise two second pushing points which are arranged at intervals along the width direction of the main body plate, the pole groove is positioned between the two second pushing points of the third group, and the distance between the second pushing points of the third group and the side wall of the pole groove is 0.45-0.85 mm. The third group of second pushing points with the distance is arranged, so that the pole platform and the main body plate can be ejected together to be demolded, and the pushing points are prevented from being additionally arranged on the bottom wall of the pole groove.

In one embodiment, the lower plastic further includes a first boss and a second boss, where the first boss and the second boss are located at two ends of the main body plate in a length direction, and each of the first boss and the second boss protrudes from the second surface, the top surface of the first boss protruding from the second surface is a fourth surface, and the top surface of the second boss protruding from the second surface is a fifth surface; the fourth surface is provided with a plurality of circular first overflow holes which are distributed along the width direction of the main body plate, and the fifth surface is provided with a plurality of circular second overflow holes which are distributed along the width direction of the main body plate; the lower plastic further comprises a plurality of third pushing points which are round and are arranged on the fourth surface and the fifth surface, the third pushing points on the fourth surface are located among the first overflow holes, the third pushing points on the fifth surface are located among the second overflow holes, and the diameter of the third pushing points is smaller than that of the first overflow holes and the second overflow holes. Through setting up a plurality of third push away the point, can be with the even ejecting in order to drawing of patterns of first boss and second boss, the diameter of third push away the point is less, can be convenient for arrange in limited space.

In one embodiment, the third pushing points are symmetrical with respect to the second central line, the connecting lines of the circle centers of the first overflow holes are first reference lines, the connecting lines of the circle centers of the second overflow holes are second reference lines, the third pushing points on the fourth surface are sequentially staggered on two sides of the first reference lines along the width direction of the main body plate, and the third pushing points on the fifth surface are sequentially staggered on two sides of the second reference lines along the width direction of the main body plate. By the arrangement, a few third pushing points are arranged, and the third pushing points on the first boss and the second boss are uniformly arranged, so that demolding ejection force is prevented from being concentrated on one side, and deformation of the first boss and the second boss is avoided.

In one embodiment, two first overflow holes are spaced between two adjacent third pushing points on the fourth surface. The requirement for demolding of the first boss and the second boss can be met by using a limited few third pushing points.

In one embodiment, the distance between the third pushing point on the fourth surface and the first overflow aperture is 0.15mm-0.35mm. The distance between the third pushing point and the surrounding structure generating the shape change is 0.15mm-0.35mm, so that the position of the third pushing point is relatively centered, and structural deformation caused by too close to the structure generating the shape change during demolding is avoided.

In one embodiment, the main body plate is further provided with a pole stand, the pole stand protrudes from the first surface, a pole groove is formed in the second surface at a position corresponding to the pole stand, a circular pole hole penetrating to the top surface of the pole stand is formed in the bottom wall of the pole groove, and the first central line intersects with the circle center of the pole hole; the second surface is convexly provided with a first limit protrusion and a second limit protrusion, the orthographic projection of the first limit protrusion on the second surface is rectangular, the length direction of the first limit protrusion is the width direction of the main body plate, the orthographic projection of the second limit protrusion on the second surface is arc-shaped, the first central line coincides with the central point of the first limit protrusion, the first limit protrusion is positioned on one side of the pole groove facing the second central line, one side of the pole groove far away from the second central line is provided with two second limit protrusions, the concave surfaces of the two second limit protrusions face the pole groove, the first limit protrusion and the two second limit protrusions are symmetrical relative to the first central line, and the first limit protrusion and the two second limit protrusions are used for limiting the movement range of the rotating sheet; the top surface of the first limiting protrusion protruding out of the second surface is a sixth surface, a fourth pushing point which is rectangular is arranged on the sixth surface, and the length direction of the fourth pushing point is the width direction of the main body plate; the second limiting protrusion protrudes from the top surface of the second surface to form a seventh surface, a fifth pushing point which is rectangular is protruding from the seventh surface, two ends of the seventh surface of the same second limiting protrusion are respectively provided with a fifth pushing point, the length direction of one fifth pushing point which is close to the second central line is the length direction of the main body plate, and the length direction of the other fifth pushing point which is far away from the second central line is the width direction of the main body plate. The first limiting bulge and the second limiting bulge are concave dies with fixed die surfaces in the cavity of the lower plastic forming die, molten plastic liquid is filled in the concave dies and is cooled and formed into limiting bulge structures in the concave dies, when lower plastic is demoulded from the fixed die surfaces, the contact area between the lower plastic and the die at the positions of the first limiting bulge and the second limiting bulge is large, the limiting bulge is inserted into the concave dies of the dies, and the required demoulding force is also larger. By setting the fourth pushing point, the first limiting protrusion can be smoothly ejected to be demolded, and by setting the fifth pushing point, the second limiting protrusion can be smoothly ejected to be demolded.

In one embodiment, the ratio of the width of the fourth pushing point to the width of the sixth surface is 0.4-0.6. Because the size of the sixth surface is smaller, the ratio range of the width is set, friction between the ejector pin and the side wall of the corresponding first limit bulge of the die can be avoided when the ejector pin is pushed and reset, the abrasion of the die is accelerated, and the influence on the yield of plastic production due to the fact that scraps generated by abrasion enter the plastic is prevented. Meanwhile, due to the size design of the fourth pushing point and the fifth pushing point, the limiting convex structures are not extruded and deformed due to the fact that the pushing forces of the first limiting convex and the second limiting convex are too concentrated.

In one embodiment, the lower plastic is provided with a liquid injection hole penetrating through the first surface and the second surface, the lower plastic further comprises a covering piece, the covering piece comprises a plurality of strips and a bottom plate, one ends of the strips are connected with the second surface, the other ends of the strips are connected with the bottom plate, the strips surround the liquid injection hole and are arranged at intervals along the circumferential direction, the bottom plate protrudes out of the top surface of the second surface to form an eighth surface, and the eighth surface is provided with a sixth pushing point. Through setting up the cover for electrolyte can not penetrate directly onto electrode assembly when annotating the liquid from annotating the liquid hole, but can be sheltered from by the bottom plate, and flow down from the interval department between a plurality of laths, can promote the even different positions that flow to electrode assembly of electrolyte, avoid the electrolyte to pile up in a large number only in a certain position of electrode assembly, and the condition that has not electrolyte yet in some positions. The middle part of bottom plate is towards second surface one side protrusion, can make the high-speed electrolyte from the convex part guide of bottom plate to the scattering all around when annotating the liquid, avoid directly striking flat bottom plate and cause the splash, influence annotate liquid efficiency. The sixth pushing point is also used for ejecting the covering piece when the lower plastic is demoulded from the fixed die surface of the die, so that the covering piece positioned in the deeper groove of the fixed die surface is prevented from being stuck to the wall surface of the die, and the die is prevented from being pulled.

In one embodiment, the middle part of the bottom plate protrudes towards one side of the second surface, the eighth surface is provided with a concave sixth pushing point, the orthographic projection of the bottom plate on the second surface is circular, the sixth pushing point is circular, and the ratio of the diameter of the sixth pushing point to the diameter of the bottom plate is 0.2-0.35. The ratio of the diameter of the sixth pushing point to the diameter of the bottom plate is 0.2-0.35, so that the ratio is reasonable, and the middle part of the bottom plate can be ejected towards one side of the second surface to form a convex structure. If the ratio is less than 0.2, the ejector pin's ejector force at the sixth pushing point is too concentrated, possibly penetrating the bottom plate. If the ratio is greater than 0.35, the ejection force of the ejector pin at the sixth pushing point is too dispersed to eject the structure that the middle part of the bottom plate protrudes towards the second surface.

When the lower plastic is demolded from the fixed die surface of the injection die, the demolding push pin can push out the lower plastic from the sixth push point, in the range of the ratio, the push force of the push pin just can push out the middle part of the bottom plate which is not completely cooled and molded towards one side of the second surface to form a convex hull structure, the convex hull is in a hillock shape of a dome, and electrolyte enters from the liquid injection hole and impacts one side of the convex hull structure towards the second surface, is guided by the convex hull structure and uniformly disperses around; not only improves the uniformity of the electrode assembly below the plastic under the electrolyte infiltration, but also avoids the back splash caused by the impact of the high-flow-rate electrolyte on the covering piece, thereby influencing the liquid injection efficiency.

In order to improve the production yield of lower plastic, the injection mold is heated to ensure that the molten plastic liquid keeps better fluidity in the mold cavity, so that the mold cavity can be filled more quickly, particularly, the lower plastic is a sheet-shaped plastic part with a complicated detailed structure, and the yield of injection products can be improved to a great extent by heating the mold; however, the problem of slow cooling of molten plastic liquid is brought about by heating the mold, so that the lower plastic injection molding process of the application accelerates the cooling of the lower plastic part when the lower plastic part is not completely cooled, namely, demolding, in order to improve the yield of injection products and improve the production efficiency; therefore, the bottom plate is propped against the bottom plate to form a convex hull structure by virtue of the demolding push pin, compared with the case that the die clamping surface of the forming die is directly processed to form the convex hull structure in the area where the bottom plate is positioned (namely, the area where the bottom plate of the movable die surface is positioned is a concave spherical cambered surface and the area where the bottom plate of the fixed die surface is positioned is an upper convex spherical cambered surface), the procedure of processing the spherical cambered surface on the surface of the die is reduced, and the production cost is reduced; meanwhile, air is not trapped at the concave spherical cambered surface of the movable die surface, and the air trapping area cannot be filled with molten plastic liquid, so that the production yield is reduced; therefore, the bottom plate which is not completely cooled and formed is propped against the convex hull structure by virtue of the demolding push pin, so that the production efficiency of the lower plastic part is improved, and the production cost is reduced.

In a second aspect, the present application also provides an end cap assembly comprising the lower plastic of any of the various embodiments of the first aspect.

In a third aspect, the present application also provides an energy storage device comprising the end cap assembly of the second aspect.

In a fourth aspect, the present application further provides an electric device, including the energy storage device in the third aspect.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.

FIG. 1 is an application scenario diagram of an energy storage device of an embodiment;

FIG. 2 is a perspective view of an end cap assembly of one embodiment;

FIG. 3 is an exploded view of an end cap assembly of one embodiment;

FIG. 4 is a perspective view of a lower plastic of an embodiment;

FIG. 5 is a perspective view of another view of the lower plastic of one embodiment;

FIG. 6a is a plan view of the lower plastic of the first embodiment;

FIG. 6b is a partial cross-sectional view of the explosion-proof boss of the first embodiment;

FIG. 6c is a plan view of the lower plastic of the second embodiment;

FIG. 6d is a plan view of the lower plastic of the third embodiment;

FIG. 6e is a plan view of the lower plastic of the fourth embodiment;

FIG. 6f is a plan view of the lower plastic of the fifth embodiment;

FIG. 6g is a plan view of the lower plastic of the sixth embodiment;

FIG. 7 is a plan view from another perspective of the lower plastic of one embodiment and a cross-sectional view thereof taken along A-A and a partial enlarged view at B.

Reference numerals illustrate:

1000-energy storage device, 2000-photovoltaic panel, 3000-fan and 4000-power grid;

100-end cap assembly;

10-lower plastic, 101-pouring hole, 11-main body plate, 111-first surface, 112-second surface, 12-explosion-proof boss, 121-third surface, 122-vent groove, 123-vent hole, 124-reinforcing plate, 13-first boss, 131-fourth surface, 132-first overflow groove, 133-first overflow hole, 14-second boss, 141-fifth surface, 142-second overflow groove, 143-second overflow holes, 151-positive pole pedestal, 152-negative pole pedestal, 153-positive pole slot, 154-negative pole slot, 155-positive pole hole, 156-negative pole hole, 16-reinforcing ribs, 17-first limit protrusions, 171-sixth surface, 18-second limit protrusions, 181-seventh surface, 19-covering pieces, 191-lath, 192-bottom plate, 193-eighth surface;

20-of a light aluminum sheet, 21-of an explosion-proof hole, 22-of a mounting hole, 221-of a positive electrode mounting hole, 222-of a negative electrode mounting hole and 23-of a liquid adding hole;

31-positive electrode sealing ring, 32-negative electrode sealing ring;

41-positive electrode column, 411-positive electrode flange part, 412-positive electrode column part, 42-negative electrode column, 421-negative electrode flange part and 422-negative electrode column part;

51-positive electrode tab, 52-negative electrode tab;

61-plastic on the positive electrode and 62-plastic on the negative electrode;

71-explosion-proof valve, 72-liquid filling plug;

c1-first central line, C2-second central line, S1-first pushing point, S2-second pushing point, S3-third pushing point, S4-fourth pushing point, S5-fifth pushing point and S6-sixth pushing point.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to fall within the scope of the present application.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

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. 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, an energy storage device 1000 provided by an embodiment of the present application is applied to an energy storage system, where the energy storage system includes an energy storage device 1000, an electric energy conversion device (photovoltaic panel 2000), a wind energy conversion device (fan 3000), a power grid 4000, and the like, 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 by the embodiment of the application can be, but is not limited to, the listed products, and can also be other application forms, and the embodiment of the 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. It should be appreciated that the energy storage device 1000 of fig. 1 includes an energy storage tank.

Referring to fig. 1, an energy storage device 1000 is provided in an embodiment of the present application, and the energy storage device 1000 may be applied in a power grid energy storage scenario. The power grid energy storage scene can also comprise power generation equipment and electric equipment; the power generation device can be a photovoltaic power generation assembly (including a photovoltaic panel 2000) or a wind power generation assembly (including a fan 3000), the electric equipment can be a power grid 4000, and the electric energy conveyed by the power grid can supply power to loads in industrial, commercial or household scenes, and the power generation device is not particularly limited. The energy storage device 1000 is electrically connected with the power generation equipment and the electric equipment respectively, and the power generated by the power generation equipment can be supplied to the energy storage device 1000 for storage or supplied to the electric equipment. The power stored by the energy storage device 1000 can also be supplied to the electric equipment.

The embodiment of the application also provides an electric device, referring to fig. 1, the electric device comprises an energy storage device 1000, and the energy storage device 1000 supplies power to the electric device. The electric equipment can be specifically the power grid 4000, a consumer electric load, a commercial base station and the like, and is not limited.

Referring to fig. 1 and 2, the energy storage device 1000 mainly includes a case (not shown), an electrode assembly (not shown) disposed in the case, an end cap assembly 100 connected to the end cap assembly 100 and closing an opening of the case by being connected to the opening of the case, and the like.

An embodiment of the present application provides an end cap assembly 100, referring to fig. 2 and 3, the end cap assembly 100 includes a lower plastic 10, a photo-aluminum sheet 20, a sealing ring, a pole, an upper plastic, an explosion-proof valve 71, etc. In some embodiments, the end cap assembly 100 does not include a tab, and in other embodiments, the end cap assembly 100 includes a tab.

The lower plastic 10 is an injection molded structure, and is provided with a post hole, wherein the post hole specifically includes a positive post hole 155 and a negative post hole 156, and the specific structure of the lower plastic 10 is described in detail later.

The aluminum sheet 20 is a sheet-like or plate-like structure of a metal conductive material, and is provided with mounting holes 22, and the mounting holes 22 specifically include a positive electrode mounting hole 221 and a negative electrode mounting hole 222. The photo-aluminum sheet 20 is connected with the lower plastic 10 such that the positive electrode post hole 155 corresponds to the positive electrode mounting hole 221 and the negative electrode post hole 156 corresponds to the negative electrode mounting hole 222.

The seal rings include a positive seal ring 31 and a negative seal ring 32, and the post includes a positive post 41 and a negative post 42. The positive electrode post 41 specifically includes a positive electrode flange portion 411 and a positive electrode post portion 412 connected to the positive electrode flange portion 411, and the negative electrode post 42 specifically includes a negative electrode flange portion 421 and a negative electrode post portion 422 connected to the negative electrode flange portion 421. The positive electrode seal ring 31 is sleeved on the positive electrode column part 412, and the negative electrode seal ring 32 is sleeved on the negative electrode column part 422. The positive electrode column portion 412 is disposed through the positive electrode column hole 155 and the positive electrode mounting hole 221, and the negative electrode column portion 422 is disposed through the negative electrode column hole 156 and the negative electrode mounting hole 222, and extends from the side of the aluminum sheet 20 facing away from the lower plastic 10. The positive electrode seal ring 31 is abutted against the outer surface of the positive electrode column portion 412 and the inner wall of the positive electrode column hole 155 and the inner wall of the positive electrode mounting hole 221, and the negative electrode seal ring 32 is abutted against the outer surface of the negative electrode column portion 422 and the inner wall of the negative electrode column hole 156 and the inner wall of the negative electrode mounting hole 222, so that the positive electrode column 41 and the negative electrode column 42 are isolated from the aluminum sheet 20 to avoid short circuit.

The switching piece is welded and fixed with the post, and the switching piece includes positive pole switching piece 51 and negative pole switching piece 52, and positive pole switching piece 51 welds with positive pole flange portion 411, and negative pole switching piece 52 welds with negative pole flange portion 421. The tab is also welded to a tab (not shown) of the electrode assembly, and specifically, the tab includes a positive tab (not shown) and a negative tab (not shown), the positive tab 51 is welded to the positive tab, and the negative tab 52 is welded to the negative tab.

In embodiments where the end cap assembly 100 does not include a tab, the tab is a separate component that is welded to the pole and tab during assembly of the energy storage device. In embodiments where the end cap assembly 100 includes a tab, the tab is welded to the post to form a unitary body, and then welded to the tab of the electrode assembly at the time of assembly of the energy storage device.

The upper plastic is connected with a pole extending from the side of the aluminum sheet 20 facing away from the lower plastic 10 and closes the mounting hole 22. Specifically, the upper plastic includes an upper positive plastic 61 and an upper negative plastic 62, the upper positive plastic 61 is sleeved on the periphery of the positive pole column portion 412, and is connected with a portion of the positive pole column portion 412 extending out of the aluminum sheet 20 and facing away from the side of the lower plastic 10, and seals the positive pole mounting hole 221, and the upper positive plastic 61 can be abutted against the positive pole sealing ring 31. The negative electrode upper plastic 62 is sleeved on the periphery of the negative electrode column part 422, is connected with a part of the negative electrode column part 422 extending out of one side of the aluminum sheet 20 and facing away from the lower plastic 10, and seals the negative electrode mounting hole 222, and the negative electrode upper plastic 62 can be abutted with the negative electrode sealing ring 32. In this way, the outer peripheral surfaces of the parts of the positive electrode column part 412 and the negative electrode column part 422, which extend out of the aluminum sheet 20, are respectively wrapped by the positive electrode plastic 61 and the negative electrode plastic 62, the positive electrode column part 412 is only exposed from the end surface facing away from the positive electrode flange part 411, and the negative electrode column part 422 is only exposed from the end surface facing away from the negative electrode flange part 421, so that accidental electric shock is avoided.

Explosion-proof hole 21 is opened to light aluminum sheet 20, and explosion-proof valve 71 is fixed and is acceptd in explosion-proof hole 21 with light aluminum sheet 20 connection. The positive electrode mounting hole 221, the explosion-proof hole 21, and the negative electrode mounting hole 222 are sequentially provided at intervals in the length direction of the aluminum flake 20. The explosion protection hole 21 may be located substantially at the center of the length direction of the aluminum sheet 20, and the positive electrode mounting hole 221 and the negative electrode mounting hole 222 may be substantially symmetrical with respect to the explosion protection hole 21.

The aluminum sheet 20 is also provided with a liquid adding hole 23, the lower plastic 10 is also provided with a liquid injecting hole 101, and the liquid injecting hole 101 corresponds to the liquid adding hole 23. The end cap assembly 100 further includes a filler plug 72, the filler plug 72 being configured to be received in the filler hole 23 and partially extend into the filler hole 101, the filler plug 72 being configured to close or open the filler hole 101 and the filler hole 23. When the filling plug 72 is pulled out to open the filling hole 23 and the filling hole 101, the electrolyte can be filled into the case accommodating the electrode assembly through the filling hole 23 and the filling hole 101, and when the filling plug 72 is plugged into the filling hole 23 and the filling hole 101, a closed space can be formed in the case.

The following describes the lower plastic 10 in detail according to an embodiment of the present application.

Referring to fig. 3-5, and fig. 6a and 6c, an embodiment of the present application provides a lower plastic 10 for an end cap assembly of an energy storage device. The lower plastic 10 is an integrally molded structure by injection molding, and the lower plastic 10 includes a main body plate 11, an explosion-proof boss 12 and a plurality of first pushing points S1.

The body plate 11 is generally rectangular, planar, and includes first and second opposed surfaces 111, 112. The first surface 111 and the second surface 112 may each be substantially planar and substantially parallel to each other, i.e. the thickness of the body plate 11 is substantially equal throughout. The first surface 111 is for interfacing with the aluminum flake 20 and the second surface 112 is for facing the electrode assembly. For convenience of location description, define: the center line extending in the longitudinal direction of the body panel 11 is a first center line C1, and the center line extending in the width direction of the body panel 11 is a second center line C2. Specifically, the plane of the body panel 11 (e.g., the first surface 111 or the second surface 112) includes two long sides and two short sides, the first center line C1 coincides with the midpoint of the two short sides, and the second center line C2 coincides with the midpoint of the two long sides. The first center line C1 and the second center line C2 are non-physical virtual lines, and due to the influences of factors such as actual production process errors, material supply, temperature and the like of the lower plastic 10, the first center line C1 and the second center line C2 not only comprise center lines in the geometric structure category, but also comprise offset possibly caused by the influences of the factors; it can be understood that the first center line C1 is a straight line where the midpoint of the two short sides or the connection line near the midpoint is located, and is a perpendicular bisector of the two short sides; the second center line C2 is a straight line where the midpoint of the two long sides or the connection line near the midpoint is located, and is a substantially perpendicular bisector of the two long sides.

The explosion-proof boss 12 is provided protruding from the second surface 112 and is adapted to correspond to the explosion-proof valve 71. The planar shape of the explosion-proof boss 12 (i.e., the shape of the orthographic projection on the second surface 112) may be substantially rectangular, with the length direction being the width direction of the body panel 11, and the width direction being the length direction of the body panel 11. The top surface of the explosion-proof boss 12 protruding from the second surface 112 is a third surface 121, and the third surface 121 may be substantially planar and parallel to the second surface 112. The main body plate 11 is provided with vent grooves 122 extending from the first surface 111 to the explosion-proof boss 12 and not penetrating the third surface 121, and a plurality of vent holes 123 penetrating the third surface 121 are provided from the bottom wall of the vent grooves 122. In other words, the main body plate 11 is provided with a vent groove 122, the vent groove 122 extends from the first surface 111 to the explosion-proof boss 12, the explosion-proof boss 12 is provided with a plurality of vent holes 123, the plurality of vent holes 123 extend from the third surface 121 to the direction of the first surface 111, and the vent groove 122 communicates with the plurality of vent holes 123. The plurality of ventilation holes 123 are symmetrical with respect to the first center line C1 and the second center line C2. The vent groove 122 is used to form a gas chamber, and the first surface 111 is in close contact with the aluminum flake 20, so that the aluminum flake 20 closes the opening of the vent groove 122 at the first surface 111, and the orthographic projection of the explosion proof valve 71 on the first surface 111 is located in the space of the vent groove 122. The plurality of vent holes 123 are communicated with the vent groove 122, and can exhaust the gas generated by the thermal abnormality of the electrode assembly to the vent groove 122, when the air pressure reaches a threshold value, the explosion-proof valve 71 can be pushed to be exploded, so that other explosion-proof positions of the explosion-proof valve 71 can flow out of the end cover assembly 100, and accidents such as explosion caused by the fact that the gas cannot be exhausted are avoided. In addition, the explosion-proof boss 12 protrudes from the second surface 112, so that the electrode assembly and the aluminum sheet 20 can be isolated farther, the risk of short circuit caused by contact is avoided, and meanwhile, a space capable of accommodating structures such as a switching sheet and the like is arranged between the second surface 112 and the electrode assembly, so that the arrangement of the structures is facilitated. A reinforcing plate 124 may be provided in the vent groove 122 to be connected to the body plate 11, and the reinforcing plate 124 is used to reinforce the structural strength of the explosion-proof boss 12.

The plurality of ventilation holes 123 may be arranged in a plurality of rows and two columns, wherein the row direction is the length direction of the main body plate 11 (i.e. the extending direction of the first center line C1, the same applies hereinafter), and the column direction is the width direction of the main body plate 11 (i.e. the extending direction of the second center line C2, the same applies hereinafter), and the second center line C2 is located between the two columns of ventilation holes 123.

The first pushing points S1 are disposed on the third surface 121 and spaced apart from each other, and the ventilation holes 123 are located between the first pushing points S1. The first pushing points S1 are arranged in a row on two sides of the second center line C2 along the width direction of the main body board 11, and the distances between the first pushing points S1 and the second center line C2 in the two rows (S1.1, S1.2) are equal. As shown in fig. 6C, the first column S1.1 of the first push points S1 and the second column S1.2 of the first push points S1 are equal in distance from the second center line C2 of the first column S1.1 of the first push points S1 and the second column S1.2 of the first push points S1.

Alternatively, referring to fig. 5 and 6C, the distance between the first pushing point S1 and the second center line C2 is greater than the distance between the vent hole 123 and the second center line C2, and the first pushing point S1 is located outside the vent hole 123 with respect to the second center line C2. Alternatively, the plurality of first pushing points S1 do not coincide with the row direction and the column direction of the plurality of vent holes 123, that is, the first pushing points S1 are located outside the vent holes 123 with respect to the second center line C2 in the row direction, and the first pushing points S1 are located at the outermost sides of the plurality of vent holes 123 and at positions between adjacent vent holes 123 in the column direction.

The lower plastic 10 is an injection molding integrated structure, namely, the explosion-proof boss 12, the main body plate 11 and the plurality of first pushing points S1 are integrated by an injection molding process. In the concrete manufacturing process, molten plastic is injected into a mold, after the plastic is solidified, the solidified plastic is ejected from the mold by using a thimble, and a pit ejected by the thimble on the plastic is a first pushing point S1, so other pushing points in the following description are also formed.

The conventional injection molding process requires demolding after plastic is completely cooled, and the structure of pushing points in the embodiment of the application does not appear when the completely cooled plastic is ejected by using the ejector pins.

In the application, the plastic can be demolded without waiting until the plastic is completely cooled. In the injection molding process, after the molten plastic is filled in the cavity of the mold, the temperature is reduced to a preset value, the preset value can be 80-120 ℃, at this time, the plastic can be molded, the ejector pin can be used for contacting the third surface 121 and applying ejection force, the pressure of the ejector pin acts on the third surface 121 to eject the plastic to be concave, the plastic at the outer side of the ejector pin is extruded by the plastic at the concave part, and the plastic is tilted from the periphery of the ejector pin, so that the shape of the first pushing point S1 of the shape of the crater is formed.

In order to fill the cavity with plastic, the mold needs to be heated in the current injection molding process to ensure that the molten plastic has enough fluidity in the cavity to ensure that the injection molding forms a qualified product. In the existing mode of completely cooling to room temperature and then demolding, the mold also needs to be cooled from high temperature to room temperature, and the mold is reheated to a higher temperature when injection molding is carried out next time.

In the embodiment of the application, since the demolding is not needed after cooling to room temperature after molding, the temperature for heating the mold can be set to the preset value when the mold is heated, or can be higher when the plastic is injected, and the temperature for heating the mold does not exceed the preset value when the plastic is filled in the cavity for cooling, and does not need to be cooled to room temperature. Thus, repeated and large-amplitude heating/cooling is avoided, and the service life of the die can be prolonged.

Compared with the prior art that the plastic is completely cooled and then demoulded, the embodiment of the application demoulds when the temperature is not cooled to room temperature, and on the basis, the first pushing point S1 is formed, and the structure of the first pushing point S1 does not have adverse effect on the structural strength of the lower plastic 10.

Specifically, referring to fig. 5 and 6b, the volcanic notch shape of the first pushing point S1 is slightly concave with respect to the third surface 121, the depth of the concave is negligible compared to the thickness of the explosion-proof boss 12 (the distance between the third surface 121 and the bottom wall of the vent groove 122), the depth of the concave is not limited, the edge of the volcanic notch shape is slightly convex with respect to the third surface 121, the height of the convex is negligible compared to the thickness of the explosion-proof boss 12, and the height of the convex is not limited. In this way, the arrangement of the first push point S1 does not adversely affect the structural strength of the explosion-proof boss 12, nor does it affect the function of isolating the aluminum sheet 20 from the electrode assembly, which is to be achieved as part of the end cap assembly 100, and leaving a space for disposing the switching sheet, etc.

The planar shape of the first pushing point S1 refers to the shape of the orthographic projection on the third surface 121 or the second surface 112, and optionally, the planar shape of the first pushing point S1 is circular, so that the end surface of the corresponding thimble is also circular, the thimble is easy to manufacture, and the thimble also facilitates the ejection operation with the explosion-proof boss 12 after penetrating through the thimble hole on the mold and extending into the mold. Alternatively, the diameter of the first push point S1 is 3.5mm. The diameter of the first pushing point S1 may be slightly larger, equal or slightly smaller than the diameter of the vent hole 123, which is not limited.

Therefore, in the embodiment of the application, by arranging the plurality of first pushing points S1 which are arranged at intervals, and making the intervals between the two rows of first pushing points S1 and the second center line C2 equal, the explosion-proof boss 12 can be subjected to uniform ejection force to realize uniform demoulding, and deformation such as bending, twisting and the like caused by uneven stress is avoided.

In one embodiment, referring to fig. 5 and 6c, the plurality of first push points S1 includes a first set S1.3 of first push points S1 and a second set S1.4 of first push points S1. The first set S1.3 of first push points S1 and the second set S1.4 of first push points S1 each include two first push points S1 arranged at intervals along the length direction of the main body plate 11. The first pushing points S1 of the first group S1.3 and the first pushing points S1 of the second group S1.4 are arranged at intervals in the width direction of the main body plate 11, the first pushing points S1 of the first group S1.3 are close to the edge of the main body plate 11, a first group S1.3 of the first pushing points S1 and a second group S1.4 of the second pushing points S2 are respectively arranged on two sides of the first center line C1, and the first groups S1.3 and the second groups S1.4 of the first pushing points S1 on two sides of the first center line C1 are symmetrical relative to the first center line C1.

By arranging the two first pushing points S1 and S1.3 and the two second pushing points S1 and S1.4 which are symmetrical relative to the first central line C1, the uniformity of stress of the explosion-proof boss 12 during demolding can be improved, and uniform demolding is facilitated, so that a deformation-free product is formed.

Optionally, the distance between the first pushing point S1 of the first set S1.3 and the long side of the main body panel 11 (i.e. the edge in the width direction of the main body panel 11 and the edge in the length direction of the explosion-proof boss 12) is 0.35mm-0.65mm, specifically may be 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, etc. The distance between the first pushing point S1 of the first group S1.3 and the edges of the vent hole 123 and the explosion-proof boss 12 in the width direction can be 0.35mm-0.65mm, in short, the distance between the first pushing point S1 of the first group S1.3 and the surrounding structure generating the shape change is 0.35mm-0.65mm, so that the position of the first pushing point S1 of the first group S1.3 is relatively centered, and the structure deformation caused by too close to the structure generating the shape change during demolding is avoided.

Similarly, the distance between the first pushing points S1 of the second group S1.4 and the surrounding structures generating the morphology change is 0.35mm-0.65mm, so that the positions of the first pushing points S1 of the second group S1.4 are relatively centered, and the deformation of the structures caused by too close to the structures generating the morphology change during demolding is avoided.

Optionally, referring to fig. 5 and fig. 6c, the plurality of first pushing points S1 further includes a third set S1.5 of first pushing points S1. The third set S1.5 of first pushing points S1 includes two first pushing points S1 arranged at intervals in the length direction of the main body plate 11, and the two first pushing points S1 in the third set S1.5 are respectively located at two sides of the first center line C1, and the third set S1.5 of first pushing points S1 are located between the second set of first pushing points S1 at two sides of the first center line C1. For example, as shown in fig. 6C, one first push point S1 of the third set S1.5 in the first column S1.1 is located above the first center line C1 shown in fig. 6C, and one first push point S1 of the third set S1.5 in the second column S1.2 is located below the first center line C1 shown in fig. 6C, that is, two first push points S1 of the third set S1.5 are staggered in the row direction (i.e., the length direction of the body plate 11, the extending direction of the first center line C1).

By arranging the third group S1.5 of the first push points S1, the fact that too many first push points S1 are not arranged at intervals between the two second group S1.4 of the first push points S1 is considered, so that the staggered third group S1.5 of the first push points S1 is adopted, and the number of the first push points S1 is reduced while the demolding uniformity is ensured.

Similarly, the distance between the third group S1.5 first pushing point S1 and the surrounding structure generating the morphology change is 0.35mm-0.65mm, so that the position of the third group S1.5 first pushing point S1 is relatively centered, and the structure deformation caused by too close to the structure generating the morphology change during demolding is avoided.

In an embodiment, referring to fig. 3 to 5, the lower plastic 10 further includes a first boss 13 and a second boss 14, the first boss 13 and the second boss 14 are respectively located at two ends of the main body plate 11 in the length direction, and each of the first boss 13 protrudes from the second surface 112 to form a fourth surface 131, and the second boss 14 protrudes from the second surface 112 to form a fifth surface 141. Wherein the first boss 13 and the second boss 14 are also symmetrical with respect to the first center line C1 and the second center line C2. The first and second bosses 13 and 14 have the function of separating the electrode assembly from the photo-aluminum sheet 20 to avoid short circuits, and providing an arrangement space for the switching sheet, etc., as in the previously described explosion-proof boss 12. The fourth surface 131 and the fifth surface 141 may both be planar and may be flush.

Referring to fig. 5 and 6d, the lower plastic 10 further includes a plurality of second pushing points S2 disposed on the second surface 112, the fourth surface 131 and the fifth surface 141, and the plurality of second pushing points S2 are symmetrical with respect to the first center line C1 and the second center line C2.

By providing a plurality of second pushing points S2, uniform ejection force can be provided to the second surface 112, the fourth surface 131 and the fifth surface 141 upon ejection, and uniform ejection can be achieved.

Alternatively, referring to fig. 5 and 6d, the fourth surface 131 is provided with a plurality of first overflow holes 133 arranged along the width direction of the main body plate 11, the plurality of second pushing points S2 includes a first set S2.1 of second pushing points S2, the first set S2.1 of second pushing points S2 includes two second pushing points S2 extending in the same direction as the plurality of first overflow holes 133, and the plurality of first overflow holes 133 are located between the two second pushing points S2 of the first set S2.1. The second push point S2 has a circular planar shape and a diameter of, for example, 3.8mm.

Referring to fig. 4 and 5, a first overflow trough 132 and a second overflow trough 142 are provided on the first surface 111, the first overflow trough 132 does not penetrate the fourth surface 131, and the second overflow trough 142 does not penetrate the fifth surface 141. A first overflow hole 133 penetrating the fourth surface 131 is formed from the bottom wall of the first overflow groove 132, and a second overflow hole 143 penetrating the fifth surface 141 is formed from the bottom wall of the second overflow groove 142. The first overflow groove 132, the first overflow hole 133, the second overflow groove 142 and the second overflow hole 143 are formed, so that the electrolyte on the first surface 111 can flow to the electrode assembly through the first overflow groove 132, the first overflow hole 133, the second overflow groove 142 and the second overflow hole 143, and the electrolyte is prevented from remaining on the first surface 111 to cause abnormal cell.

The distance between the second push point S2 of the first set S2.1 and the edge of the first boss 13 is 0.85mm-1.15mm. The distance may be specifically 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, etc., without limitation. Similar to the first pushing point S1, the distance between the first group S2.1 second pushing point S2 and the surrounding structure generating the shape change is 0.85mm-1.15mm, so that the position of the first group S2.1 second pushing point S2 is relatively centered, and the structure deformation caused by too close to the structure generating the shape change during demolding is avoided.

The first set S2.1 of second pushing points S2 is in the same direction as the arrangement direction of the plurality of first overflow holes 133, and the fifth surface 141 is also provided with the first set S2.1 of second pushing points S2 in the same direction as the arrangement direction of the plurality of second overflow holes 143, and the two first sets S2.1 of second pushing points S2 are symmetrical with respect to the first center line C1 and the second center line C2. The second boss 14 and the first boss 13 are symmetrical with respect to the first center line C1 and the second center line C2, and the distance between the second push point S2 on the fifth surface 141 and the edge of the second boss 14 is 0.85mm-1.15mm, similar to the second push point S2 on the first boss 13. In this way, the second pushing points S2 are disposed at the four corners of the lower plastic 10, so that a uniform demolding effect can be achieved for the first boss 13 and the second boss 14.

In the actual process, the first overflow holes 133 and the second overflow holes 143 may be originally designed at the outermost positions of the first boss 13 and the second boss 14 in the width direction of the main body plate 11, and the positions are replaced with the first group S2.1 of the second pushing points S2 in the present embodiment, the first boss 13 and the second boss 14 respectively reduce 2 holes, so that the flow of the electrolyte remained on the first surface 111 is hardly affected, and the increased first group S2.1 of the second pushing points S2 may facilitate the demolding of the first boss 13 and the second boss 14.

In an embodiment, referring to fig. 5 and 6d, the second surface 112 is further provided with a reinforcing rib 16 in a protruding manner, the reinforcing rib 16 is located at the edge of the long side of the main body panel 11, and two ends of the reinforcing rib are respectively connected to the first boss 13 and the explosion-proof boss 12. The reinforcing ribs 16 extend along the long sides of the body plate 11, and serve to reinforce the edges of the body plate 11. The reinforcing ribs 16 are also integrally formed with the body plate 11 by injection molding. The reinforcing ribs 16 are a plurality of, and the reinforcing ribs 16 are symmetrical with respect to the first center line C1 and the second center line C2.

The plurality of second pushing points S2 includes a second set S2.2 of second pushing points S2 that are all disposed on the second surface 112, and the second set S2.2 of second pushing points S2 includes a plurality of second pushing points S2 that are arranged at intervals along the length direction of the main body plate 11. The second pushing points S2 of the second set S2.2 are also symmetrical with respect to the first center line C1 and the second center line C2, the second pushing points S2 of the second set S2.2 are used for demolding of the main body plate 11, and the plurality of second pushing points S2 of the second set S2.2 are arranged, so that uniformity of demolding can be improved.

Optionally, the distance between the second pushing point S2 of the second set S2.2 and the reinforcement rib 16 is 1.25mm-1.85mm. The distance may be specifically 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, 1.55mm, 1.6mm, 1.65mm, 1.7mm, 1.75mm, 1.8mm, 1.85mm, etc., without limitation. The second set S2.2 of second push points S2 at this distance allows the reinforcement rib 16 to be ejected together with the body plate 11 for demoulding without having to provide additional push points on the reinforcement rib 16.

In an embodiment, please refer to fig. 3 to 5, and fig. 6d, a pole stand is further provided on the main body plate 11, the pole stand protrudes from the first surface 111, a pole slot is provided on the second surface 112 corresponding to the position of the pole stand, a circular pole hole penetrating to the top surface of the pole stand is provided from the bottom wall of the pole slot, and the first center line C1 intersects with the center of the pole hole.

Specifically, the pole stand includes a positive pole stand 151 and a negative pole stand 152, and the pole slots include a collector pole slot and a negative pole slot 154, the positive pole slot 153 corresponds to the positive pole stand 151, and the negative pole slot 154 corresponds to the negative pole slot 154. The positive electrode post groove 153 is configured to receive the positive electrode flange 411 of the positive electrode post 41, and the negative electrode post groove 154 is configured to receive the negative electrode flange 421 of the negative electrode post 42. The planar shapes of the positive electrode post land 151 and the negative electrode post land 152 (i.e., the shape of the orthographic projection on the first surface 111) are substantially square and the four corners of the square are arc transitions, and the planar shapes of the corresponding positive electrode post grooves 153 (i.e., the shape of the orthographic projection on the second surface 112) are substantially square and the four corners of the square are arc transitions. The positive and negative electrode post holes 155 and 156 are substantially circular holes, and the centers of the two holes intersect the first center line C1.

The plurality of second pushing points S2 includes a third set S2.3 of second pushing points S2 disposed on the second surface 112, the third set S2.3 of second pushing points S2 includes two second pushing points S2 arranged at intervals along the width direction of the main body plate 11, and the pole groove is located between the two second pushing points S2 of the third set S2.3. The positive electrode post groove 153 is provided with a second pushing point S2 on each side of the width direction of the main body plate 11, and the two second pushing points S2 on each side of the positive electrode post groove 153 form a third group S2.3 of second pushing points S2; the negative electrode post groove 154 is provided with one second push point S2 on each side of the body plate 11 in the width direction, and the two second push points S2 on each side of the negative electrode post groove 154 constitute another third group S2.3 of second push points S2.

Optionally, the distance between the second push point S2 of the third set S2.3 and the side wall of the pole groove is 0.45mm-0.85mm. The distance may be specifically 0.45mm, 0.5mm, 0.55mm, 0.6m, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, etc., without limitation. The third set S2.3 of second push points S2 at this distance allows the pole piece and the body plate 11 to be ejected together for demolding, avoiding the need to additionally provide push points at the bottom wall of the pole groove.

In one embodiment, referring to fig. 3 to 5, and fig. 6e, the fourth surface 131 is provided with a plurality of circular first overflow holes 133 arranged along the width direction of the main body plate 11, and the fifth surface 141 is provided with a plurality of circular second overflow holes 143 arranged along the width direction of the main body plate 11.

The lower plastic 10 further includes a plurality of third pushing points S3 having a circular shape disposed on the fourth surface 131 and the fifth surface 141, the plurality of third pushing points S3 on the fourth surface 131 are located between the plurality of first overflow holes 133, the plurality of third pushing points S3 on the fifth surface 141 are located between the plurality of second overflow holes 143, and the diameter of the third pushing points S3 is smaller than the diameters of the first overflow holes 133 and the second overflow holes 143.

By providing a plurality of third push points S3, the first bosses 13 and the second bosses 14 can be uniformly ejected to be demolded, and the third push points S3 are smaller in diameter, which can facilitate arrangement in a limited space.

In one embodiment, referring to fig. 5 and 6e, the third pushing points S3 are asymmetric with respect to the first centerline C1 and symmetric with respect to the second centerline C2. The connecting line of the centers of the plurality of first overflow holes 133 is a first reference line, and the connecting line of the centers of the plurality of second overflow holes 143 is a second reference line. The third pushing points S3 on the fourth surface 131 are staggered on both sides of the first reference line in sequence along the width direction of the main body plate 11, and the third pushing points S3 on the fifth surface 141 are staggered on both sides of the second reference line in sequence along the width direction of the main body plate 11.

By arranging a few third pushing points S3 and arranging the third pushing points S3 on the first boss 13 and the second boss 14 uniformly, the demolding ejection force is prevented from concentrating on one side, and the first boss 13 and the second boss 14 deform.

Alternatively, referring to fig. 5 and 6e, two first overflow apertures 133 are spaced between two adjacent third push points S3 on the fourth surface 131. Similarly, two second overflow apertures 143 are spaced between two adjacent third push points S3 on the fifth surface 141. In this way, the requirement for demolding of the first boss 13 and the second boss 14 can be satisfied with a limited number of third push points S3.

Alternatively, referring to fig. 5 and 6e, the distance between the third push point S3 on the fourth surface 131 and the first overflow aperture 133 is 0.15mm-0.35mm. Similarly, the distance between the third pushing point S3 on the fifth surface 141 and the second overflow aperture 143 is 0.15mm-0.35mm. The distance may be specifically 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, etc., without limitation. The distance between the third pushing point S3 and the surrounding structure generating the shape change is 0.15mm-0.35mm, so that the position of the third pushing point S3 is relatively centered, and structural deformation caused by too close to the structure generating the shape change during demolding is avoided.

In one embodiment, please refer to fig. 3 to 5, and fig. 6f, the second surface 112 is convexly provided with a first limiting protrusion 17 and a second limiting protrusion 18. The front projection of the first limiting protrusion 17 on the second surface 112 is rectangular, the length direction is the width direction of the main body plate 11, and the front projection of the second limiting protrusion 18 on the second surface 112 is circular arc. The first central line C1 coincides with the center point of the first limit protrusion 17, and the first limit protrusion 17 is located at one side of the pole groove facing the second central line C2. Two second limiting protrusions 18 are arranged on one side, away from the second central line C2, of the pole groove, and the concave surfaces of the two second limiting protrusions 18 face the pole groove. The first limiting protrusion 17 and the two second limiting protrusions 18 are symmetrical with each other along the first central line C1, and the first limiting protrusion 17 and the two second limiting protrusions 18 are used for limiting the movement range of the rotating sheet.

The top surface of the first limiting protrusion 17 protruding from the second surface 112 is a sixth surface 171, and the sixth surface 171 is provided with a fourth pushing point S4 having a rectangular shape, and the length direction of the fourth pushing point S4 is the width direction of the main body plate 11.

The top surface of the second limiting protrusion 18 protruding from the second surface 112 is a seventh surface 181, and the seventh surface 181 is provided with a rectangular fifth pushing point S5. The two ends of the seventh surface 181 of the same second limiting protrusion 18 are respectively provided with a fifth pushing point S5, the length direction of one fifth pushing point S5 close to the second center line C2 is the length direction of the main body plate 11, and the length direction of the other fifth pushing point S5 far from the second center line C2 is the width direction of the main body plate 11.

The first limiting bulge 17 and the second limiting bulge 18 are concave dies with fixed die surfaces in the cavity of the lower plastic 10 forming die, molten plastic liquid is filled in the concave dies and is cooled and formed into a limiting bulge structure in the concave dies, when the lower plastic is demoulded from the fixed die surfaces, the contact area between the plastic 10 and the die at the positions of the first limiting bulge 17 and the second limiting bulge 18 is large, the limiting bulge is inserted into the concave dies of the die, and the required demoulding force is also larger. By providing the fourth pushing point S4, the first limit projection 17 can be smoothly ejected to release the mold, and by providing the fifth pushing point S5, the second limit projection 18 can be smoothly ejected to release the mold.

Optionally, the ratio of the width of the fourth pushing point S4 to the width of the sixth surface 171 is 0.4-0.6. The ratio may be specifically 0.4, 0.5, 0.6. Because the sixth surface 171 has smaller size, the ratio range of the width is set, so that friction between the ejector pin and the side wall of the mold corresponding to the first limiting protrusion 17 during pushing and resetting can be avoided, mold abrasion is accelerated, and the influence of chips generated by abrasion on the plastic in the plastic production yield is prevented. Meanwhile, due to the size design of the fourth pushing point S4 and the fifth pushing point S5, the limiting protrusion structures are not extruded and deformed due to the fact that the pushing forces of the first limiting protrusion 17 and the second limiting protrusion 18 are too concentrated.

In one embodiment, referring to fig. 3 to 5, and fig. 6g, the lower plastic 10 further includes a cover 19. The cover 19 includes a plurality of strips 191 and a bottom plate 192, one end of the plurality of strips 191 being connected to the second surface 112 and the other end being connected to the bottom plate 192, the plurality of strips 191 being circumferentially spaced around the pouring orifice 101.

Through setting up the cover piece 19 for electrolyte can not penetrate directly on the electrode assembly when annotating the liquid from annotating liquid hole 101, but can be sheltered from by bottom plate 192, and flow down from the interval department between a plurality of laths 191, can promote the even different positions that flow to the electrode assembly of electrolyte, avoid the electrolyte to pile up in a large number only in a certain position of electrode assembly, and the condition that has not had electrolyte yet in some positions.

The top surface of the bottom plate 192 protruding from the second surface 112 is an eighth surface 193, and the eighth surface 193 is provided with a sixth pushing point S6. By providing the sixth pushing point S6, the cover 19 can be easily released from the mold.

Alternatively, referring to fig. 5, 6g and 7, the middle of the bottom plate 192 protrudes toward the side of the second surface 112, and the eighth surface 193 is recessed where the sixth push point S6 is provided. The orthographic projection of the bottom plate 192 on the second surface 112 is circular, the sixth pushing point S6 is circular, and the ratio of the diameter of the sixth pushing point S6 to the diameter of the bottom plate 192 is 0.2-0.35. The ratio may be specifically 0.2, 0.25, 0.3, 0.35, etc., without limitation.

The middle part of the bottom plate 192 protrudes towards one side of the second surface 112, so that high-speed electrolyte can be guided to be scattered around from the protruding part of the bottom plate 192 during liquid injection, and the phenomenon that the electrolyte is splashed back and influences the liquid injection efficiency due to direct impact on the flat bottom plate 192 is avoided.

In addition, the sixth pushing point S6 is further used for ejecting the covering member 19 when the lower plastic 10 is released from the fixed mold surface of the mold, so as to avoid the adhesion between the covering member 19 located in the deep groove of the fixed mold surface and the wall surface of the mold, and the mold drawing.

By setting the ratio of the diameter of the sixth pushing point S6 to the diameter of the bottom plate 192 to be 0.2-0.35, the ratio is reasonable, and the middle portion of the bottom plate 192 can be pushed out toward the side of the second surface 112 to form a convex structure. If the ratio is less than 0.2, the ejector pin ejection force at the sixth push point S6 is too concentrated, and may pierce the bottom plate 192, resulting in structural damage. If the ratio is greater than 0.35, the ejector pin will have too much force at the sixth pushing point S6 to eject the structure with the middle portion of the bottom plate 192 protruding toward the second surface 112.

When the lower plastic 10 is demolded from the fixed molding surface of the injection mold, the demolding push pin can push out the lower plastic 10 from the sixth push point S6, in the range of the ratio, the push force of the push pin just can push out the middle part of the bottom plate 192 which is not completely cooled and molded towards one side of the second surface 112 to form a convex hull structure, the convex hull is in a hillock shape with a dome top, and electrolyte enters from the liquid injection hole and impacts one side of the convex hull structure towards the second surface, is guided by the convex hull structure and is uniformly dispersed to the periphery; not only improves the uniformity of the electrode assembly below the plastic under the electrolyte infiltration, but also avoids the back splash caused by the impact of the high-flow-rate electrolyte on the covering piece, thereby influencing the liquid injection efficiency.

In order to improve the production yield of the lower plastic 10, the injection mold is heated to ensure that the molten plastic liquid keeps better fluidity in the mold cavity, so that the mold cavity can be filled more quickly, particularly, the lower plastic 10 is a sheet-shaped plastic part with a complicated detailed structure, and the heating mold can improve the yield of injection products to a great extent; however, the problem of slow cooling of molten plastic liquid is brought about by heating the mold, so that the lower plastic injection molding process of the application accelerates the cooling of the lower plastic part when the lower plastic part is not completely cooled, namely, demolding, in order to improve the yield of injection products and improve the production efficiency; therefore, the bottom plate 192 is propped against to form a convex hull structure by virtue of the demolding push pin, compared with the method that the area of the bottom plate 192 is directly processed into the convex hull structure by directly processing the die clamping surface of the forming mold (namely, the area of the bottom plate 192 of the moving mold surface is a concave spherical cambered surface and the area of the bottom plate 192 of the fixed mold surface is an upper convex spherical cambered surface), the process of processing the spherical cambered surface on the surface of the mold is reduced, and the production cost is reduced; meanwhile, air is not trapped at the concave spherical cambered surface of the movable die surface, and the air trapping area cannot be filled with molten plastic liquid, so that the production yield is reduced; therefore, the bottom plate 192 which is not completely cooled and formed is propped against the convex hull structure by virtue of the demolding push pin, so that the production efficiency of the lower plastic part is improved, and the production cost is reduced.

Referring to fig. 5 and 6a, in a specific embodiment, the first push point S1, the second push point S2, the third push point S3, the fourth push point S4, the fifth push point S5 and the sixth push point S6 are simultaneously disposed on the lower plastic 10, so that the whole lower plastic 10 can be uniformly demolded without cooling to room temperature.

In the description of the embodiments of the present application, it should be noted that, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like refer to the orientation or positional relationship described based on the drawings, which are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

The above disclosure is only a preferred embodiment of the present application, and it should be understood that the scope of the application is not limited thereto, but all or part of the procedures for implementing the above embodiments can be modified by one skilled in the art according to the scope of the appended claims.

Claims

1. A lower plastic for an end cap assembly of an energy storage device, the lower plastic being of a structure formed integrally by injection molding, the lower plastic comprising:

the first pushing points are arranged on the third surface and are arranged at intervals, the ventilation holes are positioned among the first pushing points, the first pushing points are respectively arranged on two sides of the second center line in a row along the width direction of the main body plate, and the intervals between the first pushing points and the second center line in two rows are equal;

The lower plastic further comprises a first boss and a second boss, the first boss and the second boss are respectively positioned at two ends of the main body plate in the length direction and are respectively protruded from the second surface, the top surface of the first boss protruded from the second surface is a fourth surface, and the top surface of the second boss protruded from the second surface is a fifth surface;

the lower plastic further comprises a plurality of second pushing points arranged on the second surface, the fourth surface and the fifth surface, and the second pushing points are symmetrical relative to the first midline and the second midline;

the fourth surface is provided with a plurality of circular first overflow holes which are distributed along the width direction of the main body plate, and the fifth surface is provided with a plurality of circular second overflow holes which are distributed along the width direction of the main body plate;

the lower plastic further comprises a plurality of third pushing points which are arranged on the fourth surface and the fifth surface and are round, the third pushing points on the fourth surface are positioned among the first overflow holes, and the third pushing points on the fifth surface are positioned among the second overflow holes;

A pole platform is further arranged on the main body plate, the pole platform protrudes out of the first surface, a pole groove is formed in the position, corresponding to the pole platform, of the second surface, a pole hole which penetrates to the top surface of the pole platform and is circular is formed in the bottom wall of the pole groove, and the first central line is intersected with the circle center of the pole hole;

the second surface is convexly provided with a first limit protrusion and a second limit protrusion, the orthographic projection of the first limit protrusion on the second surface is rectangular, the length direction of the first limit protrusion is the width direction of the main body plate, the orthographic projection of the second limit protrusion on the second surface is arc-shaped, the first central line coincides with the central point of the first limit protrusion, the first limit protrusion is positioned on one side of the pole groove facing the second central line, one side of the pole groove far away from the second central line is provided with two second limit protrusions, the concave surfaces of the two second limit protrusions face the pole groove, the first limit protrusion and the two second limit protrusions are symmetrical relative to the first central line, and the first limit protrusion and the two second limit protrusions are used for limiting the movement range of the rotating sheet;

The top surface of the first limiting protrusion protruding out of the second surface is a sixth surface, a fourth pushing point which is rectangular is arranged on the sixth surface, and the length direction of the fourth pushing point is the width direction of the main body plate;

the second limiting protrusion protrudes from the top surface of the second surface to form a seventh surface, a fifth pushing point which is rectangular is protruding from the seventh surface, two ends of the seventh surface of the same second limiting protrusion are respectively provided with a fifth pushing point, the length direction of one fifth pushing point which is close to the second central line is the length direction of the main body plate, and the length direction of the other fifth pushing point which is far away from the second central line is the width direction of the main body plate.

2. The lower plastic of claim 1, wherein the plurality of first pushing points includes a first set of the first pushing points and a second set of the first pushing points, each of the first set of the first pushing points and the second set of the first pushing points includes two first pushing points arranged at intervals along a length direction of the main body plate, the first set of the first pushing points and the second set of the first pushing points are arranged at intervals in a width direction of the main body plate, the first set of the first pushing points are close to edges of the main body plate, each of two sides of the first center line is provided with a first set of the first pushing points and a second set of the second pushing points, and the first set of the first pushing points and the second set of the first pushing points on two sides of the first center line are symmetrical with respect to the first center line.

3. The lower plastic of claim 2, wherein the plurality of first pushing points further comprises a third set of first pushing points, the third set of first pushing points comprises two first pushing points arranged at intervals in the length direction of the main body plate, the two first pushing points in the third set are respectively located at two sides of the first center line, and the third set of first pushing points are located between the second set of first pushing points at two sides of the first center line.

4. The lower plastic according to claim 1, wherein the fourth surface is provided with a plurality of first overflow holes arranged along the width direction of the main body plate, the plurality of second pushing points comprise a first group of second pushing points, the first group of second pushing points comprise two second pushing points which are in the same extending direction as the plurality of first overflow holes, the plurality of first overflow holes are positioned between the two second pushing points of the first group, and the distance between the first group of second pushing points and the edge of the first boss is 0.85mm-1.15mm;

the second boss and the first boss are symmetrical relative to the first central line and the second central line, and the distance between the second pushing point on the fifth surface and the edge of the second boss is 0.85mm-1.15mm.

5. The lower plastic according to claim 1, wherein the second surface is further provided with reinforcing ribs, the reinforcing ribs are located at the edges of the long sides of the main body plate, and two ends of the reinforcing ribs are respectively connected with the first boss and the explosion-proof boss;

the second pushing points comprise a second group of second pushing points which are arranged on the second surface, the second group of second pushing points comprise a plurality of second pushing points which are distributed at intervals along the length direction of the main body plate, and the distance between the second pushing points and the reinforcing ribs is 1.25-1.85 mm.

6. The lower plastic according to claim 1, wherein the main body plate is further provided with a pole stand, the pole stand protrudes from the first surface, a pole slot is formed in the second surface at a position corresponding to the pole stand, a pole hole which penetrates to the top surface of the pole stand and is circular is formed from the bottom wall of the pole slot, and the first central line intersects with the center of the pole hole;

the plurality of second pushing points comprise a third group of second pushing points arranged on the second surface, the third group of second pushing points comprise two second pushing points which are arranged at intervals along the width direction of the main body plate, the pole groove is positioned between the two second pushing points of the third group, and the distance between the second pushing points of the third group and the side wall of the pole groove is 0.45-0.85 mm.

7. The lower plastic of claim 1, wherein the diameter of the third push point is smaller than the diameters of the first overflow aperture and the second overflow aperture.

8. The lower plastic of claim 1, wherein the third pushing points are symmetrical with respect to the second center line, the connecting lines of the circle centers of the first overflow holes are first reference lines, the connecting lines of the circle centers of the second overflow holes are second reference lines, the third pushing points on the fourth surface are sequentially staggered on two sides of the first reference lines along the width direction of the main body plate, and the third pushing points on the fifth surface are sequentially staggered on two sides of the second reference lines along the width direction of the main body plate.

9. The lower plastic of claim 8, wherein two of said first overflow apertures are spaced between two adjacent ones of said third push points on said fourth surface.

10. The lower plastic of claim 1, wherein the distance between the third push point on the fourth surface and the first overflow aperture is 0.15mm-0.35mm.

11. The lower plastic of claim 1, wherein the ratio of the width of the fourth pushing point to the width of the sixth surface is 0.4-0.6.

12. The lower plastic of claim 1, wherein the lower plastic is provided with a liquid injection hole penetrating through the first surface and the second surface, the lower plastic further comprises a covering piece, the covering piece comprises a plurality of strips and a bottom plate, one ends of the strips are connected with the second surface, the other ends of the strips are connected with the bottom plate, the strips are arranged around the liquid injection hole at intervals along the circumferential direction, the top surface of the bottom plate protruding out of the second surface is an eighth surface, and the eighth surface is provided with a sixth pushing point.

13. The lower plastic according to claim 12, wherein the middle part of the bottom plate protrudes towards one side of the second surface, the eighth surface is concave at the sixth pushing point, the orthographic projection of the bottom plate on the second surface is circular, the sixth pushing point is circular, and the ratio of the diameter of the sixth pushing point to the diameter of the bottom plate is 0.2-0.35.

14. An end cap assembly comprising the lower plastic of any one of claims 1 to 13.

15. An energy storage device comprising the end cap assembly of claim 14.

16. A powered device comprising the energy storage device of claim 15.