CN116365123A

CN116365123A - Lower plastic, end cover assembly, energy storage device and electric equipment

Info

Publication number: CN116365123A
Application number: CN202310635190.3A
Authority: CN
Inventors: 熊永锋; 陈志雄; 黄立炫
Original assignee: Shenzhen Haichen Energy Storage Control Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Shenzhen Haichen Energy Storage Control Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2023-05-31
Filing date: 2023-05-31
Publication date: 2023-06-30
Anticipated expiration: 2043-05-31
Also published as: CN116365123B

Abstract

The lower plastic comprises a main body plate, a sinking platform, a boss and a pole platform which are integrally molded through injection molding, wherein a plurality of first thimble portions are arranged on the first surface of the main body plate, and the first thimble portions are symmetrical relative to a central axis; the first thimble portions are arranged in a plurality of groups, at least two first thimble portions are arranged in each group at intervals along the width direction of the main body plate and are symmetrical relative to the central axis, and the groups are arranged at intervals along the length direction of the main body plate. So set up, the drawing of patterns that lower plastic can be even avoids deformation such as crooked, distortion because the atress is uneven, simultaneously, the lower plastic of this application embodiment can carry out ejecting operation after the plastic shaping, need not cool off after the room temperature in the mould completely again drawing of patterns to production efficiency has been improved.

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 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 purpose of this application is to provide a lower plastic, end cover subassembly, energy memory and consumer, solves the problem that the plastic injection molding drawing of patterns inefficiency and production deformation and yield are low down.

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 comprising: a body plate including first and second opposed surfaces, the second surface for abutting a cover plate of the end cap assembly; a sinking platform connected to one end of the main body plate in the length direction, the sinking platform protruding from the first surface; the boss is connected with one end, far away from the sinking table, of the main body plate in the length direction, protrudes from the first surface and is used for being arranged opposite to the explosion-proof valve; the pole stand is arranged on the main body plate, the pole stand protrudes out of the second surface, the pole stand is arranged close to the sinking platform, the pole stand is provided with a vent hole and a through hole, the vent hole and the through hole are arranged at intervals along the length direction of the main body plate, and the through hole is positioned at one side of the vent hole facing the sinking platform; the main body plate, the sinking platform, the boss and the pole platform are of an integrated structure formed by an injection molding process, in front projection of the first surface, the lower plastic is symmetrical relative to a central axis, the central axis is a straight line extending along the length direction of the main body plate and positioned in the middle of the width direction of the main body plate, and the boss and the pole platform are intersected with the central axis; the first surface is provided with a plurality of first thimble portions, the first thimble portions are symmetrical relative to the central axis, and the plane shape of the first thimble portions is circular; the plurality of first thimble portions are arranged in a plurality of groups, at least two first thimble portions are arranged in each group at intervals along the width direction of the main body plate and are symmetrical relative to the central axis, the plurality of groups are arranged at intervals along the length direction of the main body plate, the first thimble portions in the first group are close to the edge of the pole post platform and are arranged at intervals along the width direction of the main body plate with the through holes, at least part of the first thimble portions in the second group are close to the edge of the main body plate along the width direction and are arranged at intervals along the width direction of the main body plate with the positions between the vent holes and the through holes, and the first thimble portions in the third group are close to the edge of one end, connected with the boss, of the main body plate along the length direction of the main body plate and are close to the edge along the width direction of the main body plate.

The lower plastic of this application embodiment, through set up a plurality of first thimble portions at the first surface, a plurality of first thimble portions are the multiunit, including first group, second group and third group, can evenly distributed on the first surface, when a plurality of thimbles contact and exert ejection force with a plurality of first thimble portion S1, first surface can receive even ejection force, can even drawing of patterns, avoid because bending, distortion etc. deformation that the atress is uneven leads to, simultaneously, the lower plastic of this application embodiment can carry out ejection operation after the plastic shaping, need not to cool off the drawing of patterns again after the room temperature in the mould completely, thereby improved production efficiency.

In one embodiment, the surface topography of the first thimble portion is different from the topography of the first surface, and the surface roughness of the first thimble portion is smaller than the surface roughness of the first surface.

In one embodiment, a distance between the first thimble portion and the edge of the pole platform in the width direction of the main body plate is 0.6mm-1.45mm; and a first group of first thimble portions are arranged in a range of 6mm-10mm offset to both sides of the length direction of the main body plate relative to the first reference by taking a straight line which passes through the center of the through hole and extends in the width direction of the main body plate as the first reference.

In one embodiment, two edges of the width direction of the main body plate are provided with raised strips protruding out of the first surface, and the distance between the second group of first thimble portions and the raised strips in the width direction of the main body plate is 0.6mm-1.8mm; and a second group of first thimble portions are arranged in a range of 6mm-20mm offset to two sides of the length direction of the main body plate relative to the second reference by taking a straight line which passes through the center of the vent hole and the midpoint of a connecting line passing through the center of the vent hole and extends in the width direction of the main body plate as the second reference.

In one embodiment, the third group of the first thimble portions and the second group of the first thimble portions are opposite to each other in the longitudinal direction of the main body plate.

In one embodiment, the second group further includes the first thimble portion facing the first group in the longitudinal direction of the main body plate.

In one embodiment, the plurality of first thimble portions further includes a fourth group, the fourth group of first thimble portions and the first group of first thimble portions are opposite to each other in the longitudinal direction of the main body plate, and the fourth group of first thimble portions is arranged in a range of 6mm to 10mm offset from the third reference to both sides of the main body plate in the longitudinal direction with respect to a straight line extending in the width direction of the main body plate through the center of the vent hole as the third reference.

In one embodiment, at least one group of the first thimble portions is further arranged between the fourth group of the first thimble portions and the third group of the first thimble portions; and/or a group of first thimble portions are further arranged between the first group of first thimble portions and the sinking table.

In one embodiment, the top surface of the sinking platform protruding from the first surface is a third surface, the top surface of the boss protruding from the first surface is a fourth surface, and the third surface and the fourth surface are flush; the third surface and the fourth surface are respectively provided with a plurality of second thimble portions, the second thimble portions are symmetrical relative to the central axis, the second thimble portions are positioned on two opposite sides of the pole platform, the plane shape of the second thimble portions is circular, and the radius of the second thimble portions is smaller than that of the first thimble portions.

In one embodiment, the sinking platform is provided with a plurality of through holes penetrating to a third surface, the through holes are distributed at intervals along the width direction of the main body plate, the second thimble portions on the third surface are arranged among the through holes, the distance between the second thimble portions and the through holes is 0.8mm-1.45mm, a straight line passing through the center of the through holes and extending along the width direction of the main body plate is a fourth reference, and the second thimble portions are arranged in a range of 6mm-10mm offset from the fourth reference to two sides of the length direction of the main body plate.

In one embodiment, the boss is provided with a plurality of ventilation holes penetrating through the fourth surface, the plurality of ventilation holes are provided with the second thimble portion on the outer side of the main body plate in the width direction, and the second thimble portion on the fourth surface is opposite to at least part of the plurality of second thimble portions on the third surface.

In one embodiment, a fence is provided on a side wall of the vent hole, the fence has a fifth surface corresponding to the first surface, the third surface, the fourth surface and the fifth surface are further provided with a plurality of third thimble portions, the third thimble portions are symmetrical with respect to the central axis, the third thimble portions on the third surface and the fourth surface are located between the second thimble portions and the central axis, the third thimble portions on the third surface are located between the through holes, the third thimble portions on the fourth surface are located between the vent holes, and the radius of the third thimble portions is smaller than that of the second thimble portions.

In one embodiment, the fence comprises a plurality of cross-connected cross bars and vertical bars, and the third thimble portion is arranged at the intersection of the cross bars and the vertical bars.

In one embodiment, the boss includes the first convex part that is "T" shape, first convex part includes first section and second section, first section is followed the width direction of main part board extends, the second section is followed the length direction of main part board extends, just the second section is connected first section orientation sink one side of platform, first section with a plurality of bleeder vent has all been seted up on the second section, just first section with a plurality of on the second section bleeder vent is the array and arranges, first section with all be equipped with a plurality of on the second section third thimble portion, a plurality of on the first section third thimble portion is followed the width direction interval of main part board arranges, a plurality of on the first convex part third thimble portion is triangle-shaped and arranges.

In one embodiment, a distance between the third thimble portion and the through hole on the third surface is 1.6mm to 2.8mm.

In a second aspect, the present application provides an end cap assembly comprising a cover plate, an explosion-proof valve, and a lower plastic of any of the various embodiments of the first aspect, the second surface of the body plate being in abutment with the cover plate, the explosion-proof valve being disposed on the cover plate, the boss being opposite to the explosion-proof valve.

In a third aspect, the present application provides an energy storage device comprising a cell assembly, an adapter, and an end cap assembly according to the second aspect, the adapter connecting the cell assembly and the end cap assembly.

In a fourth aspect, the present application provides a powered device, including the energy storage device of the third aspect, where the energy storage device supplies power to the powered device.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a consumer energy storage scenario of an embodiment;

FIG. 2 is a perspective view of an energy storage device of an embodiment;

FIG. 3 is an exploded view of an energy storage device of an embodiment;

FIG. 4 is a plan view of the lower plastic of one embodiment;

FIG. 5 is a perspective view of a second lower plastic of an embodiment;

FIG. 6 is a perspective view of another view of the second lower plastic of FIG. 5;

FIG. 7a is a plan view of the second lower plastic of FIG. 5;

FIG. 7b is a plan view of an embodiment of a first spike portion of the second lower plastic of FIG. 7 a;

FIG. 7c is a plan view of an embodiment of a second ejector pin portion of the second lower plastic of FIG. 7 a;

FIG. 7d is a plan view of an embodiment of a third spike portion of the second lower plastic of FIG. 7 a;

fig. 8 is a partial cross-sectional view of a body panel of an embodiment.

Reference numerals illustrate:

100-energy storage device, 200-power generation equipment and 300-electric equipment;

11-shell, 12-cell component, 121-cell, 122-positive electrode lug and 123-negative electrode lug;

20-end cover components, 21-first lower plastic, 22-second lower plastic, 23-cover plates, 231-stress pieces, 24-explosion-proof valves and 241-cover plates; 31-first adapter, 32-second adapter;

1-a main body plate, 101-a first surface, 102-a second surface, 103-an air vent, 104-a through hole, 108-a convex strip, 110-a fence, 111-a horizontal strip, 112-a vertical strip, 113-a fifth surface, 115-a pole stand, 2-a sinking stand, 201-a third surface, 202-an through hole, 3-a boss, 301-a fourth surface, 302-an air vent, 310-a first convex part, 311-a first sub-section, 312-a second sub-section, 313-a third sub-section, 314-a second section, 320-a second convex part;

S1-a first thimble portion, S2-a second thimble portion and S3-a third thimble portion.

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, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

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 presented 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. It is well known that to achieve the big goal of carbon neutralization, the main way to generate green electric energy is to develop green energy sources such as photovoltaic, wind power and the like to replace fossil energy sources,

at present, the generation of green electric energy generally depends on photovoltaic, wind power, water potential and the like, but wind energy, solar energy and the like generally have the problems of strong intermittence and large fluctuation, which can cause unstable power grid, insufficient peak electricity consumption, too much electricity consumption and unstable voltage can cause damage to the electric power, so that the problem of 'wind abandoning and light abandoning' possibly occurs due to insufficient electricity consumption requirement or insufficient power grid acceptance, and the problem needs to be solved by relying on energy storage. The energy is converted into other forms of energy through physical or chemical means and is stored, the energy is converted into electric energy when needed and released, in short, the energy storage is similar to a large-scale 'charge pal', the electric energy is stored when the photovoltaic and wind energy are sufficient, and the stored electric power is released when needed.

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

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

(1) The large energy storage container applied to the energy storage scene at the power grid side can be used as a high-quality active and reactive power regulation power supply in the power grid, so that the load matching of electric energy in time and space is realized, the renewable energy consumption capability is enhanced, and the large energy storage container has great significance in the aspects of standby of a power grid system, relieving peak load power supply pressure and peak regulation and frequency modulation;

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

In this embodiment, a household energy storage scene in user side energy storage is taken as an example for illustration, and referring to fig. 1, the energy storage device is not limited to the household energy storage scene.

The application provides a household energy storage system, this household energy storage system includes electric energy conversion equipment (photovoltaic board), user load (street lamp), user load (domestic appliance) etc. and energy storage device 100, and this energy storage device is a small-size tank, and accessible hanging mode installs in outdoor wall. In particular, the photovoltaic panel may convert solar energy into electric energy during low electricity price periods, and the energy storage device 100 is used to store the electric energy and supply the electric energy to street lamps and household appliances for use during electricity price peaks, or to supply power during power outage/power outage of the power grid.

It is understood that the energy storage device may include, but is not limited to, a battery cell, a battery module, a battery pack, a battery system, and the like. When the energy storage device is a single battery, it may be a square battery.

Referring to fig. 1, an energy storage device 100 is provided in an embodiment of the present application, and the energy storage device 100 can be applied in a household energy storage place. The household energy storage place can also comprise power generation equipment 200 and electric equipment 300; the power generation device 200 may be a photovoltaic power generation assembly or a wind power generation assembly, and the electric device 300 may be, but is not limited to, a television, a computer, an illumination lamp, etc. The energy storage device 100 is electrically connected to the power generation device 200 and the electric equipment 300, respectively, and the electric power generated by the power generation device 200 can be supplied to the energy storage device 100 for storage or supplied to the electric equipment 300. The power stored by the energy storage device 100 may also be supplied to the powered device 300.

The embodiment of the present application further provides an electric device 300, referring to fig. 1 and 2, the electric device 300 includes an energy storage device 100, and the energy storage device 100 supplies power to the electric device 300.

Referring to fig. 2 and 3, the energy storage device 100 includes a housing 11, a battery module 12, an adapter and an end cap module 20. The battery cell assembly 12 comprises a battery cell 121, a positive electrode lug 122 and a negative electrode lug 123, and the positive electrode lug 122 and the negative electrode lug 123 are respectively connected with the battery cell 121. The battery cell assembly 12 is arranged in the shell 11, the adapter connects the battery cell assembly 12 and the end cover assembly 20, and the end cover assembly 20 closes the opening of the shell 11. The adaptor includes a positive-side adaptor, i.e., a first adaptor 31 and a negative-side adaptor, i.e., a second adaptor 32, and the end cap assembly 20 is connected to the first adaptor 31 and the second adaptor 32 and is connected to the opening of the case 11 to close the case 11.

The end cap assembly 20 includes a cover plate 23, an explosion proof valve 24, and a lower plastic. The explosion-proof valve 24 is disposed on the cover plate 23, and the explosion-proof valve 24 may be further covered with a cover plate 241. Referring to fig. 3 and 4, the lower plastics include a lower plastics 21 on the positive side and a lower plastics 22 on the negative side, wherein the first lower plastics 21 and the second lower plastics 22 are abutted against the cover plate 23. The first lower plastic 21 corresponds to the positive electrode lug 122, the second lower plastic 22 corresponds to the negative electrode lug 123, and the first lower plastic 21 and the second lower plastic 22 are butted along the length direction X of the cover plate 23, and the butted position is opposite to the explosion-proof valve 24.

The embodiment of the present invention is described by taking the negative side lower plastic, i.e., the second lower plastic 22, as an example, it should be understood that the positive side lower plastic, i.e., the first lower plastic 21, can also be referred to.

The embodiment of the present application provides a lower plastic, specifically a lower plastic at the negative side, namely a second lower plastic 22, please refer to fig. 5 to 7a, wherein the second lower plastic 22 includes a main body plate 1, a sinking table 2 and a boss 3.

The body panel 1 comprises a first surface 101 and a second surface 102 opposite each other. The first surface 101 and the second surface 102 are planar.

The body plate 1 is further provided with a pole stand 115, the pole stand 115 protrudes from the second surface 102, and the pole stand 115 is arranged close to the sinking stand 2. The pole piece 115 is provided with a vent hole 103 and a through hole 104, the vent hole 103 and the through hole 104 are provided at intervals along the longitudinal direction of the body plate 1, and the through hole 104 is located on the side of the vent hole 103 facing the sinking table 2. The pole piece 115 is also recessed from the first surface 101 to form a receiving space for receiving the flange portion of the pole piece. The vent 103 is used for allowing air to pass through, and referring to fig. 3, the cover plate 23 is provided with a stress member 231, and air generated by the battery cell 121 can flow to the stress member 231 through the vent 103. The through hole 104 is used for penetrating the columnar portion of the pole.

The stress piece 231 is arranged on the cover plate 23, and stress deformation occurs by configuring the stress piece 231 to respond to the pressure increase in the energy storage device 100, so that when the gas in the energy storage device 100 exceeds a preset pressure threshold value, the stress piece 231 can be in stress deformation and contact with the metal conductive pressing block, so that the anode assembly is subjected to external short circuit, and then the bottom of the stress piece 231 and the bottom of the metal conductive pressing block generate fusing and roof cutting phenomena to return to an open circuit state due to strong short circuit current, thereby avoiding the overcharge of the energy storage device 100 and avoiding explosion of the energy storage device 100.

The sinking platform 2 is connected to one end of the main body plate 1 in the length direction X, and the sinking platform 2 protrudes from the first surface 101. The top surface of the sinking platform 2 protruding from the first surface 101 is a third surface 201, and the third surface 201 is also a plane.

The second surface 102 of the body plate 1 and the surface of the counter plate 2 facing away from the third surface 201 may be flush and both be adapted to abut, in particular be glued, against the cover plate 23.

The boss 3 is connected to one end of the main body plate 1 far away from the sinking platform 2 in the length direction X, and the boss 3 is arranged opposite to the explosion-proof valve 24; the boss 3 protrudes from the first surface 101, and the top surface of the boss 3 protruding from the first surface 101 is a fourth surface 301.

The main body plate 1, the sinking platform 2, the boss 3 and the pole platform 115 are of an integrated structure formed through an injection molding process, so that the main body plate 1, the sinking platform 2 and the boss 3 do not need an additional connecting structure, the structure is compact, and the connection reliability is high.

In the front projection of the first surface 101, i.e. in a plan view perpendicular to the first surface 101, the second lower plastic 22 is symmetrical with respect to a central axis a, which is a straight line extending along the length direction X of the body plate 1 and located in the middle of the width direction Y of the body plate 1, and the boss (3) and the pole stage (115) both intersect with the central axis a. In other words, the central axis a coincides with a line between midpoints of two short sides of the body plate 1 extending in the width direction Y.

The second lower plastic 22 is manufactured by an injection molding process, and high-temperature melted plastic is injected into a mold cavity of a mold (not shown) through an injection molding opening during injection molding, and after the mold cavity is filled with the plastic, the plastic is solidified and molded after the high-temperature plastic is reduced in temperature, and then the second lower plastic 22 is obtained.

FIG. 7a is a schematic view showing the arrangement of the ejector pin portions in one embodiment, which includes a first ejector pin portion S1, a second ejector pin portion S2, and a third ejector pin portion S3; FIG. 7b shows a schematic view of the arrangement of the first ejector pin portion S1 in an embodiment, wherein the second ejector pin portion S2 and the third ejector pin portion S3 are omitted; FIG. 7c shows a schematic view of the arrangement of the second ejector pin portion S2 in an embodiment, wherein the first ejector pin portion S1 and the third ejector pin portion S3 are omitted; fig. 7d shows a schematic view of the arrangement of the third ejector pin portion S3 in an embodiment, wherein the first ejector pin portion S1 and the second ejector pin portion S2 are omitted.

Referring to fig. 6, 7a and 7b, the first surface 101 is provided with a plurality of first ejector pin portions S1, the plurality of first ejector pin portions S1 are symmetrical with respect to the central axis a, and the first ejector pin portions S1 are used for abutting with ejector pins (not shown) during molding of the mold to push molded plastic out of the mold for demolding.

In this application embodiment, just demold when the temperature of plastic is higher, need not wait for the temperature of plastic to reduce to room temperature, can improve production efficiency.

The plurality of first thimble portions S1 are divided into a plurality of groups, each group is provided with at least two first thimble portions S1, the first thimble portions S1 in each group are distributed at intervals along the width direction Y of the main body plate 1 and are symmetrical relative to the central axis A, and the plurality of groups are distributed at intervals in the length direction X of the main body plate 1. Specifically, the first thimble portions S1 in each group are opposite to each other in the width direction Y of the main body plate 1 and symmetrical with respect to the central axis a, and the number of the first thimble portions S1 in each group is an even number, for example, 2, 4, 6, 8, etc., without limitation. Illustratively, the first ejector pin portions S1 in the first set S1.1 are 2, the first ejector pin portions S1 in the second set S1.2 are 4, and the first ejector pin portions S1 in the third set S1.3 are 2. The groups are spaced apart from each other in the longitudinal direction X of the body plate 1. The opposite direction means that the connecting line of the center points (i.e., the circle centers) of the two first thimble portions S1 is parallel to the corresponding direction, if the connecting line of the circle centers of the two first thimble portions S1 is opposite to the width direction Y of the main body board 1, the connecting line of the circle centers of the two first thimble portions S1 is parallel to the length direction X, and the opposite direction is defined as follows, and will not be described in detail later.

Wherein the first thimble portions S1 in the first group S1.1 are close to the edge of the post 115 and are arranged at intervals in the width direction Y of the body plate 1 with the through holes 104, at least part of the first thimble portions S1 in the second group S1.2 are close to the edge of the body plate 1 in the width direction Y and are arranged at intervals in the width direction Y of the body plate 1 with positions between the vent holes 103 and the through holes 104, and the first thimble portions S1 in the third group S1.3 are close to the edge of the end of the body plate 1 in the length direction X connected with the boss 3 and are close to the edge of the body plate 1 in the width direction Y.

In order to solve the problem that the plastic contacts with the ejector pins when the temperature is higher, the ejector pins generate deformation such as bending and twisting when the plastic is ejected, a plurality of groups of first ejector pin parts S1 are arranged, and specifically, the ejector pins comprise a first group S1.1 of first ejector pin parts S1, a second group S1.2 of first ejector pin parts S1 and a third group S1.3 of first ejector pin parts S1, wherein the three groups of first ejector pin parts S1 are uniformly distributed on the first surface 101, the first group S1.1 is close to one end of the main body plate 1 in the length direction X, the third group S1.3 is close to the other end of the main body plate 1 in the length direction X, and the first group S1.1 and the second group S1.2 are close to the pole piece 115 and are close to the edge of the main body plate 1 or the position of a structural member (namely the pole piece 115), so that the plurality of first ejector pin parts S1 are uniformly distributed, the ejector pins can apply uniform ejection force to the second lower plastic 22 when the first group S1 contacts with the ejector pins, and uniform bending and twisting and the like can be avoided.

When using the thimble to carry out ejecting operation to the plastic, set up a plurality of thimbles and contact with a plurality of first thimble portion S1 to synchronous movement makes first surface 101 receive the ejection force effect of thimble simultaneously, and the power is comparatively even, can avoid ejecting force inhomogeneous to lead to the problem that the plastic warp, so, can make after the plastic shaping can carry out ejecting operation, need not demold after cooling to room temperature in the mould completely, thereby improved production efficiency.

Therefore, the second lower plastic 22 of this application embodiment, through setting up a plurality of first thimble portions S1 at first surface 101, a plurality of first thimble portions S1 divide into the multiunit, including first group S1.1, second group S1.2 and third group S1.3, can evenly distributed on first surface 101, when a plurality of thimbles contact and exert ejection force with a plurality of first thimble portions S1, first surface 101 can receive even ejection force, can even drawing of patterns, avoid deformation such as bending, distortion that leads to because the atress is uneven, simultaneously, the second lower plastic 22 of this application embodiment can carry out ejection operation after plastic shaping, need not to cool down the room temperature after the drawing of patterns completely in the mould, thereby production efficiency has been improved.

Referring to fig. 6, 7b and 8, the first ejector pin portion S1 has a volcanic shape, a middle portion thereof is concave relative to the first surface 101, and an edge thereof protrudes from the first surface 101, and a planar shape of the first ejector pin portion S1 is circular.

Specifically, in the injection molding and demolding process, when the plastic is not cooled to room temperature, the ejector pin contacts the first surface 101 and applies ejection force, the pressure of the ejector pin acts on the first surface 101 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 is tilted from the periphery of the ejector pin, and thus, the shape of the first ejector pin part S1 in the shape of a crater is formed.

The volcanic notch shape of the first ejector pin portion S1 is the final product structure of the second lower plastic 22, and is formed by the ejector pin exerting an ejector force on the first surface 101 of the main body plate 1. When the ejector pins do not contact the second lower plastic 22, i.e. the demolding operation is not performed, the first ejector pin portion S1 may not be formed on the first surface 101.

Of course, in some embodiments, the first ejector pin portion S1 may be provided when the demolding is not performed, that is, when the ejector pin is not in contact with the first surface 101, the first surface 101 may have a volcanic notch-shaped structure of the first ejector pin portion S1.

In this embodiment, the volcanic notch shape of the first ejector pin portion S1 is slightly concave with respect to the first surface 101, the concave depth is negligible compared with the thickness of the main body plate 1 (the dimension of the main body plate 1 in the Z direction), the specific concave depth is not limited, the edge of the volcanic notch shape is slightly convex with respect to the first surface 101, the convex height is negligible compared with the thickness of the main body plate 1, and the specific convex height is not limited. In this way, the arrangement of the first ejector pin portion S1 does not adversely affect the structural strength of the main body plate 1, and does not affect the function of the second lower plastic 22 for accommodating the battery cell assembly 12 and the like.

The plane shape of the first thimble portion S1 is a shape of a volcanic-shaped front projection on the first surface 101, and the plane shape of the first thimble portion S1 is circular, so that the end surface of the corresponding thimble is also circular, the thimble is easy to manufacture, and the thimble is also convenient to extend into the mold through a thimble hole on the mold to perform ejection operation with the second lower plastic 22.

The shape of the first ejector pin portion S1 is described above, and the shapes of the second ejector pin portion S2 and the third ejector pin portion S3 to be described later are similar to those of the first ejector pin portion S1, and are also volcanic mouth shapes, and the plane shape is also circular, which will not be described later and only need reference.

In one embodiment, referring to fig. 6, 7a and 7b, the surface topography of the first thimble portion S1 is different from the topography of the first surface 101. Specifically, the surface roughness of the first ejector pin portion S1 is smaller than the surface roughness of the first surface 101.

The arrangement is that the reflection of light after the angle is adjusted is clearly visible under the condition of unidirectional light source. The reason for the difference in roughness is that the machining precision of the movable ejector pin of the die is higher, the surface of the movable ejector pin is smoother, and when the ejector pin ejects the plastic, the movable ejector pin is pressed on the first surface 101 of the second lower plastic 22 which is not completely molded, so that the surface of the first ejector pin part S1 which is relatively smooth and has lower roughness is formed; the surface machining precision of the fixed die is low due to cost control, and the first surface of the formed second lower plastic 22 is obviously frosted and roughened.

The roughness of the first ejector pin portion S1 is smaller than the surface roughness of the first surface 101, and the shapes of the second ejector pin portion S2 and the third ejector pin portion S3, which will be described later, are similar to those of the first ejector pin portion S1, and the respective surface roughness is also smaller than the surface roughness of the surface where the first ejector pin portion S1 is located.

In one embodiment, referring to fig. 6, 7a and 7b, the distance between the first thimble portion S1 of the first group S1.1 and the edge of the pole platform 115 in the width direction Y of the main body plate 1 is 0.6mm-1.45mm. The first ejector pin portions S1 of the first group S1.1 are arranged within a range of 6mm to 10mm offset from the first reference to both sides of the longitudinal direction X of the body plate 1 with respect to the first reference by taking a straight line extending in the width direction Y of the body plate 1 through the center of the hole 104 as the first reference.

Specifically, the distance between the first thimble portion S1 of the first group S1.1 and the edge of the pole platform 115 in the width direction Y of the main body plate 1 may be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.45mm, or other values, which are not limited specifically. In this range, the first set S1.1 of first thimble portions S1 is closer to the pole platform 115, and when the thimble applies ejection force to the first set S1.1 of first thimble portions S1, the position of the junction between the pole platform 115 and the main body plate 1 can be ejected, and damage to the junction between the pole platform 115 and the main body plate 1 is not easy to occur; if the distance is less than 0.6mm, the thimble will be too close to the pole platform 115, and damage may be caused to the junction between the pole platform 115 and the main body plate 1; if the distance is greater than 1.45mm, the distance between the ejector pin and the pole piece 115 is large, and it is difficult to eject the junction between the pole piece 115 and the body plate 1 during ejection, and deformation such as bending or twisting may occur at the junction between the pole piece 115 and the body plate 1.

The range in which the first thimble portions S1 of the first group S1.1 can be offset on both sides of the longitudinal direction X of the body plate 1 with respect to the first reference may specifically be 6mm, 7mm, 8mm, 9mm, 10mm, or the like, and may also be other numerical values, and the present invention is not limited specifically. It should be understood that the position of the first set S1.1 of the first ejector pin portions S1 is determined when the mold is designed, that is, the position of the ejector pin holes should be adapted to the position of the second lower plastic 22 when the mold is designed, where the first set S1.1 of the first ejector pin portions S1 is provided with ejector pin holes at any position within a certain range relative to the left and right sides of the first reference (i.e., on both sides in the length direction X of the main body plate 1), so that the ejector pins pass through the ejector pin holes to eject the second lower plastic 22, and the position of the first set S1.1 of the first ejector pin portions S1 remaining on the second lower plastic 22 is offset by a certain distance relative to the first reference. By the arrangement, the first thimble part S1 of the first group S1.1 can be close to the position of the pole platform 115, where the through hole 104 is arranged, and can apply ejection force to plastic near the through hole 104, so that the main body plate 1 can be effectively ejected at the position near the through hole 104 and the joint with the pole platform 115, and the precision requirements on the die and the thimble are lower, and the cost is low. When the deflectable range is smaller than 6mm, the precision requirement on the die is high, namely the tolerance between the position of the ejector pin hole of the die and the first reference is small, the precision requirement on the ejector pin is also high, and the cost is high; when the deflectable range is larger than 10mm, the distance between the ejector pin and the plastic near the through hole 104 is far during ejector pin ejection operation, which is not beneficial to ejecting the plastic near the through hole 104 and is easy to generate deformation near the through hole 104.

In one embodiment, referring to fig. 6, 7a and 7b, two edges of the main body plate 1 in the width direction Y are provided with protruding strips 108 protruding from the first surface 101, and the distance between the second set S1.2 of first ejector pin portions S1 and the protruding strips 108 in the width direction Y of the main body plate 1 is 0.6mm-1.8mm. The first ejector pin portions S1 of the second group S1.2 are arranged within a range shifted by 6mm to 20mm from the second reference to both sides of the longitudinal direction X of the body plate 1 with respect to the second reference, with a straight line extending in the width direction Y of the body plate 1 passing through the midpoint of a line (which coincides with the central axis a) between the center of the vent hole 103 and the center of the through hole 104 as the second reference.

Since the main body plate 1 has a thin sheet-like structure, the structure is weak, particularly, the structure at the edge is weak and is easy to deform, the provision of the convex strips 108 can enhance the structural strength of the main body plate 1 and reduce the deformation. The protrusion 108 and the body plate 1 are an integrally molded structure formed by injection molding, and the height of the protrusion 108 protruding from the first surface 101 is not limited, and the dimension (i.e., thickness) of the protrusion 108 in the width direction Y of the body plate 1 is also not limited. The distance between the second set S1.2 of first ejector pin portions S1 and the convex strips 108 in the width direction Y of the main body plate 1 may be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, etc., and may be other values, which are not limited in particular. Similar to the principle of the first set S1.1 of the first ejector pin portions S1, the numerical range is set such that the first ejector pin portions S1 of the second set S1.2 are close to the convex strips 108, that is, close to the edges of the main body plate 1 in the width direction Y, and can perform ejection operation on plastic near the edges of the main body plate 1 in the width direction Y, so that damage to the edges of the main body plate 1 in the width direction Y is not easy to occur. If the distance is less than 0.6mm, the ejector pin will be too close to the convex strip 108, possibly causing damage to the edge of the main body board 1; if the distance is greater than 1.45mm, the distance between the ejector pins and the protruding strips is large, and it is difficult to eject the plastic near the edges of the protruding strips 108 and the main body plate 1 during ejection, and deformation such as bending or twisting may occur near the edges of the protruding strips 108 and the main body plate 1 in the width direction Y.

The range in which the first ejector pin portion S1 of the second group S1.2 can be shifted on both sides of the longitudinal direction X of the body plate 1 with respect to the second reference may specifically be 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, etc., and may also be other values, specifically without limitation. It should be understood that the position of the first ejector pin portion S1 of the second set S1.2 is determined when the mold is designed, that is, the position of the ejector pin hole should be adapted to the position of the second lower plastic 22 when the mold is designed, where the first ejector pin portion S1 of the second set S1.2 is provided with ejector pin holes at any position within a certain range relative to the left and right sides of the second reference (i.e., on both sides in the length direction X of the main body plate 1), so that the ejector pins pass through the ejector pin holes to eject the second lower plastic 22, and the position of the first ejector pin portion S1 of the second set S1.2 remaining on the second lower plastic 22 is offset by a certain distance relative to the second reference. By means of the arrangement, the first ejector pin portion S1 of the second group S1.2 can be close to the position between the vent hole 103 and the through hole 104 on the pole platform 115, ejection force can be applied to plastic near the position, and therefore effective ejection is possible, the precision requirements on the die and the ejector pin are low, and cost is low. When the deflectable range is smaller than 6mm, the precision requirement on the die is high, namely the tolerance between the position of the ejector pin hole of the die and the second reference is small, the precision requirement on the ejector pin is also high, and the cost is high; when the deflectable range is larger than 20mm, the distance between the ejector pin and the plastic near the position between the vent hole 103 and the through hole 104 on the pole piece 115 is large, which is disadvantageous in ejecting the plastic near the position between the vent hole 103 and the through hole 104 on the pole piece 115, and deformation is likely to occur near the position between the vent hole 103 and the through hole 104 on the pole piece 115.

Optionally, referring to fig. 6, 7a and 7b, the second set S1.2 further includes a first ejector pin portion S1 opposite to the first set S1.1 in the length direction X of the main body plate 1. For example, as shown in fig. 7b, the number of first thimble portions S1 in the first group S1.1 is 2, and 1 is located on each side of the central axis a; the number of the first thimble parts S1 in the second group S1.2 is 4, and the number of the first thimble parts S1 is 2 at two sides of the central axis A; the 2 first thimble portions S1 in the second set S1.2 (i.e., the 2 first thimble portions S1 near the pole platform 115) are opposite to the 2 first thimble portions S1 in the first set S1.1 in the length direction X of the main body plate 1, that is, the distances between the two opposite first thimble portions S1 and the central axis a are equal, and the central point connecting line of the two opposite first thimble portions S1 is parallel to the length direction X (or the central axis a) of the main body plate 1. The remaining 2 first ejector pin portions S1 of the second set S1.2 are close to the convex strips 108, which are described above and will not be repeated.

Other numbers of first thimble portions S1 of the first set S1.1 and the second set S1.2 may also satisfy at least partially opposite requirements.

By the arrangement, the first thimble portions S1 of the first group S1.1 and the second group S1.2 are uniformly distributed on the main body plate 1, stress is uniform during demolding, the distribution is regular, and the design of a die is facilitated.

Alternatively, referring to fig. 6, 7a and 7b, the first ejector pin portions S1 of the third set S1.3 are opposite to the first ejector pin portions S1 of the second set S1.2 in the longitudinal direction X of the main body plate 1. And at least part of the first thimble portions S1 of the second group S1.2 is opposite to the first thimble portions S1 of the first group S1.1, and the third group S1.3 may be opposite to the second group S1.2, where two first thimble portions S1 of the second group S1.2 close to the central axis a are opposite to the first thimble portions S1 of the first group S1.1 in the longitudinal direction X of the main body plate 1, and two first thimble portions S1 of the third group S1.3 are opposite to two first thimble portions S1 of the second group S1.2 close to the edge of the main body plate 1 in the width direction Y of the main body plate 1 in the longitudinal direction X of the main body plate 1.

The first ejector pin parts S1 from the first group S1.1 to the third group S1.3 are arranged, the distribution is relatively uniform in the length direction X and the width direction Y of the main body plate 1, uniform ejection force can be provided when the ejector pins are ejected, plastic can be uniformly ejected, deformation is avoided, and the yield and the production efficiency are improved.

Optionally, referring to fig. 6, fig. 7a and fig. 7b, the plurality of first ejector pin portions S1 further includes a fourth group S1.4, and the fourth group S1.4 of first ejector pin portions S1 are opposite to the first group S1.1 of first ejector pin portions S1 in the length direction X of the main body plate 1. The fourth group S1.4 of first ejector pin portions S1 are arranged in a range of 6mm to 10mm offset from the third reference to both sides in the longitudinal direction X of the body plate 1 with respect to the third reference by a straight line extending in the width direction Y of the body plate 1 through the center of the vent hole 103.

The range in which the first thimble portions S1 of the fourth group S1.4 can be offset on both sides of the longitudinal direction X of the main body plate 1 with respect to the third reference may specifically be 6mm, 7mm, 8mm, 9mm, 10mm, etc., and may also be other numerical values, and the present invention is not limited thereto. The principle and effect are similar to those of the first group S1.1 and the second group S1.2, and the reference is only made.

Optionally, referring to fig. 6, fig. 7a and fig. 7b, at least one group of first thimble portions S1 is further disposed between the fourth group S1.4 of first thimble portions S1 and the third group S1.3 of first thimble portions S1; and/or, a group of first thimble portions S1 is further arranged between the first thimble portions S1 and the sinking table 2 in the first group S1.1.

Specifically, a fifth group S1.5 of first thimble portions S1 and/or a sixth group S1.6 of first thimble portions S1 and/or a seventh group S1.7 of first thimble portions S1 are further disposed between the fourth group S1.4 of first thimble portions S1 and the third group S1.3 of first thimble portions S1. The fifth group S1.5 of first ejector pin portions S1 may be provided with 4, and are opposite to the 4 first ejector pin portions S1 of the second group S1.2 in the length direction of the main body plate 1. The sixth set S1.6 of first thimble portions S1 is located between the fifth set S1.5 and the third set S1.3, and 4 first thimble portions S1 of the sixth set S1.6 may be provided, and two edges near the main body plate 1 are opposite to two edges near the main body plate 1 of the fifth set S1.5, and two first thimble portions S1 on the inner side of the sixth set S1.6 are closer to the central axis a than two on the inner side of the fifth set S1.5. The seventh group S1.7 of first thimble portions S1 is located between the sixth group S1.6 and the third group S1.3, and the seventh group S1.7 of first thimble portions S1 may be provided with 2, one first thimble portion S1 located outside (i.e., one near the edge of the main body plate 1) and one first thimble portion S1 located inside (i.e., one near the central axis a) of the sixth group S1.6 in the width direction of the main body plate 1.

The first group S1.1 of first thimble portions S1 and the eighth group S1.8 of first thimble portions S1 between the sinking table 2. The eighth set S1.8 of first ejector pin portions S1 may be provided with 4, and are opposite to the 4 first ejector pin portions S1 of the second set S1.2 in the length direction of the main body plate 1.

Through setting up foretell multiunit first thimble portion S1, multiunit first thimble portion S1 is on the even distribution of the first surface 101 of main part board 1, and plastic atress is even when the ejector pin ejecting plastic, avoids warping, can improve yield and production efficiency.

It should be understood that, in the first plurality S1 of ejector pins of the first to eighth groups S1.1 to S1.8, each group is symmetrical to the central axis a, and the number of each group may be increased or decreased. For example, the number of the 2 first ejector pin portions S1 of the first set S1.1 may be increased to 4, the number of the 4 first ejector pin portions S1 of the second set S1.2 may be reduced to 2, and so on, the following steps are not enumerated any more, and in any case, the plurality of first ejector pin portions S1 on the main body plate 1 may be uniformly distributed. In the specific embodiment shown in fig. 7a, in combination with fig. 7b, the first ejector pin portions S1 of the first, second, third and fourth groups S1.1, S2, S1.3, S1.4, S1.6 are 2, wherein the second and third groups S1.2, S1.3 retain the outer two, the first, fourth and sixth groups S1.1, S1.4, S1.6 retain the inner two, and the fifth, seventh and eighth groups S1.5, S1.7, S1.8 are omitted.

In one embodiment, referring to fig. 6, 7a and 7c, the top surface of the sinking platform 2 protruding from the first surface 101 is a third surface 201, the top surface of the boss 3 protruding from the first surface 101 is a fourth surface 301, and the third surface 201 and the fourth surface 301 are flush. The third surface 201 and the fourth surface 301 are respectively provided with a plurality of second thimble portions S2, the second thimble portions S2 are symmetrical with respect to the central axis a, and the second thimble portions S2 are located at two opposite sides of the pole platform 115. As discussed above, the shape of the second ejector pin portion S2 is also a volcanic shape, the planar shape of the second ejector pin portion S2 is a circle, and the radius of the second ejector pin portion S2 is smaller than the radius of the first ejector pin portion S1.

After the sinking table 2 and the boss 3 are arranged on the second lower plastic 22, structural differences are formed between the sinking table 2 and the boss 3 and the main body plate 1, and a plurality of first thimble portions S1 are arranged on the main body plate 1, so that the connection between the main body plate 1 and the sinking table 2 and the boss 3 and the connection between the sinking table 2 and the boss 3 are easy to deform, the plurality of second thimble portions S2 are arranged, the sinking table 2 and the boss 3 can be ejected through corresponding thimble matching by the plurality of second thimble portions S2, the connection between the main body plate 1 and the sinking table 2 and the boss 3 and the deformation of the sinking table 2 and the boss 3 are avoided, and the yield is improved.

Because the main body plate 1 is a large-area flat plate-shaped structure, the structural dimensions of the sinking platform 2 and the boss 3 are much smaller than those of the main body plate 1, and particularly, the third surface 201 of the sinking platform 2 and the fourth surface 301 of the boss 3 are much smaller than those of the first surface 101 of the main body plate 1, the positions on the third surface 201 and the fourth surface 301 where the second thimble portions S2 can be arranged are limited, the first surface 101 is large in area and has enough positions to arrange the first thimble portions S1, and therefore, the radius of the second thimble portions S2 is smaller than that of the first thimble portions S1, so that the structure of the main body plate 1, the sinking platform 2 and the boss 3 can be adapted, and the good ejection and demoulding operations can be performed.

Referring to fig. 5 and 6, the middle part of the sinking platform 2 is provided with a concave structure to be located at the pole platform 115, so that the width of the middle part of the sinking platform 2 is smaller than the width of both sides. Referring to fig. 6, fig. 7a and fig. 7c, the plurality of second thimble portions S2 on the third surface 201 are disposed on two opposite sides of the pole platform 115, so that the second thimble portions S2 can have a larger area for arrangement, and further, the radius of the second thimble portions S2 can be made larger, so that the thimble and the sinking platform 2 have a larger contact area, and the sinking platform 2 can receive a larger ejection force and is not damaged easily.

The second ejector pin portion S2 provided for the fourth surface 301 of the boss 3 is also provided based on the position of the air hole 302 of the boss 3, which will be described in detail later.

Through setting up such second thimble portion S2, can be through thimble rather than the cooperation with sinking platform 2 and the ejecting drawing of patterns of boss 3, avoid producing the deformation, improve production efficiency.

Referring to fig. 6, 7a and 7c, the sinking platform 2 is provided with a plurality of through holes 202 penetrating to the third surface 201, the plurality of through holes 202 are arranged at intervals along the width direction Y of the main body plate 1, a plurality of second thimble portions S2 on the third surface 201 are arranged between the plurality of through holes 202, and the distance between the second thimble portions S2 and the through holes 202 is 0.8mm-1.45mm. The second ejector pin portion S2 is arranged within a range shifted by 6mm to 10mm from the fourth reference to both sides of the longitudinal direction X of the body plate 1 with respect to the fourth reference with respect to a straight line extending in the width direction Y of the body plate 1 through the center of the through hole 202.

The plurality of through holes are substantially equally spaced apart in the width direction Y of the body plate 1, and the through holes 202 function to vent and allow electrolyte remaining on the second surface 102 of the body plate 1 during the liquid injection to flow to the cell assembly 12 through the through holes 202. Wherein the sinking platform 2 is concave towards the middle part of one side of the boss 3, and the through hole at the position corresponding to the concave is also offset towards one side away from the boss 3 relative to the through hole at the part without the concave. A second thimble portion S2 is disposed between the plurality of through holes 202 on the two sides of the sinking platform 2 which are not concave. For example, as shown in fig. 7c, the plurality of second thimble portions S2 on the sinking table 2 are a first group S2.1, and the number of the first group S2.1 of second thimble portions S2 may be an even number of 2, 4, 6, etc., wherein fig. 7c shows 6, wherein the outermost one of the second thimble portions S2 is disposed at a position between the outermost one of the through holes 202 in the width direction Y of the body plate 1 and an edge of the sinking table 2 in the width direction Y of the body plate 1, the middle one of the second thimble portions S2 is disposed at a position between two adjacent through holes 202, the innermost one of the second thimble portions S2 is disposed at a position between one of the through holes 202 near the concave portion and the concave portion, and the first group S2.1 of second thimble portions S2 are symmetrical with respect to the central axis a. The first group S2.1 of second ejector pin portions S2 are arranged along the width direction Y of the main body plate 1. The distance between the second thimble portion S2 on the sinking platform 2 and the through hole 202 may be the distance between any one second thimble portion S2 in the first set S2.1 and the through hole 202, which is not limited. The distance between the first set S2.1 of second ejector pin portions S2 on the sinking table 2 and the through hole 202 may be 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.45mm, etc., and may also be other values, which are not particularly limited. In this range, the distance between the second thimble portion S2 and the through hole 202 is moderate, and when the thimble is pushed to the second thimble portion S2 at this position, the plastic is uniformly stressed, so that the sinking table 2 can uniformly demold the positions including the through hole 202. If the distance is smaller than 0.8mm, the second thimble portion S2 is too close to the through hole 202, and the thimble is easy to damage the plastic at the through hole 202; if the distance is larger than 1.45mm, the second ejector pin portion S2 may not be positioned, may overlap with the edge of the sinking table 2, may be too far from the through hole 202, and may be easily deformed because plastic near the through hole 202 is difficult to eject during ejection and demolding.

The fourth reference is a straight line extending along the width direction Y of the main body plate 1 at the center of the through hole 202 at the non-concave portion at the two sides of the sinking table 2, and the range of the first group S2.1 of second thimble portions S2 that can deviate from the fourth reference may specifically be 6mm, 7mm, 8mm, 9mm, 10mm, etc., and may also be other values, specifically without limitation. When the deflectable range is smaller than 6mm, the precision requirement on the die is high, namely the tolerance between the position of the ejector pin hole of the die and the fourth reference is small, the precision requirement on the ejector pin is also high, and the cost is high; when the deflectable range is larger than 10mm, the ejector pins are easily contacted with the edges of the sinking table 2 in the longitudinal direction X of the main body plate 1 during ejector pin ejection operation, and deformation is easily generated near the edges of the sinking table 2 in the longitudinal direction X of the main body plate 1.

Alternatively, referring to fig. 6, 7a and 7c, the boss 3 is provided with a plurality of air holes 302 penetrating to the fourth surface 301, the plurality of air holes 302 are provided with second ejector pin portions S2 on the outer side of the body plate 1 in the width direction Y, and the second ejector pin portions S2 on the fourth surface 301 are opposite to at least part of the plurality of second ejector pin portions S2 on the third surface 201.

The plurality of ventilation holes 302 on the boss 3 correspond to the explosion-proof valve, and the second ejector pin portion S2 on the fourth surface 301 is provided outside (i.e., near the edge in the width direction Y of the body plate 1) in order to avoid the ventilation holes 302 and prevent clogging of the ventilation holes 302, as described above. The second ejector pin portion S2 on the fourth surface 301 is opposite to at least part of the plurality of second ejector pin portions S2 on the third surface 201, and may be set according to specific situations, for example, as shown in fig. 7c, 6 second ejector pin portions S2 of the first group S2.1 are provided on the

third surface

201, 4 second ejector pin portions S2 of the second group S2.2 are provided on the

fourth surface

301, and 4 second ejector pin portions S2 of the second group S2.2 are opposite to 4 second ejector pin portions S2 on the outer side of the first group S2.1. As also shown in fig. 7a, the two second ejector pin portions S2 of the first set S2.1 located between the outermost side and the innermost side are opposite to the two second ejector pin portions S2 of the second set S2.2 located on the inner side.

By the arrangement, the ejector pins can be regularly distributed, ejection force is uniform, and ejection and demolding can be uniform.

In one embodiment, referring to fig. 5, 6, 7a and 7d, the sidewall of the vent 103 is provided with a fence 110, and the fence 110 has a fifth surface 113 corresponding to the first surface 101. The third surface 201, the fourth surface 301 and the fifth surface 113 are further provided with a plurality of third thimble portions S3, and the third thimble portions S3 are symmetrical with respect to the central axis a. The third ejector pin portions S3 on the third surface 201 and the fourth surface 301 are located between the second ejector pin portion S2 and the central axis a, the third ejector pin portions S3 on the third surface 201 are located between the through holes 202, and the third ejector pin portions S3 on the fourth surface 301 are located between the air holes 302. The radius of the third ejector pin portion S3 is smaller than the radius of the second ejector pin portion S2.

As described above, the middle portion of the sinking table 2 is recessed and the dimension in the longitudinal direction X of the main body plate 1 is reduced, so that the plastic ejection die can be released by providing the second ejector pin S2 having a smaller radius than the third ejector pin S3 on the third surface 201 of the recessed portion. After the plurality of ventilation holes 302 are formed in the boss 3, the size of the position between the ventilation holes 302 is insufficient to set the third thimble portion S3 with a larger radius, and the plastic ejection die can be demolded by setting the third thimble portion S3 with a smaller radius. For demolding of pole piece 115, a third ejector pin portion S3 is provided on fence 110, and the third ejector pin portion S3 with a smaller radius can be provided with enough space arrangement considering the smaller size of fence 110. Wherein the third surface 201, the fourth surface 301 and the fifth surface 113 are all planar and parallel to the first surface 101.

Optionally, the fence 110 includes a plurality of cross-connected cross bars 111 and vertical bars 112, and the third ejector pin portion S3 is disposed at the intersection of the cross bars 111 and the vertical bars 112. The third thimble portion S3 is disposed at the intersection of the horizontal bar 111 and the vertical bar 112, where the fence 110 can bear a larger ejection force, and the area is larger than other positions, so that there is enough space for disposing the third thimble portion S3.

Optionally, referring to fig. 5 and 6, the boss 3 includes a first protruding portion 310 in a T shape, the first protruding portion 310 includes a first section and a second section 314, the first section extends along a width direction Y of the main body board 1, the second section 314 extends along a length direction X of the main body board 1, the second section 314 is connected to a side of the first section facing the sinking platform 2, a plurality of ventilation holes 302 are formed in the first section and the second section 314, and the plurality of ventilation holes 302 in the first section and the second section 314 are arranged in an array.

The first segment specifically includes a first sub-segment 311, a second sub-segment 312, and a third sub-segment 313, where the three sub-segments all extend along the width direction Y of the main body board 1, the second sub-segment 312 and the third sub-segment 313 are respectively connected to two opposite ends of the first sub-segment 311 along the width direction Y of the main body board 1, and the second segment 314 is connected to the first sub-segment 311. The first subsection 311 is concave relative to the second surface 102 of the body plate 1, and the first subsection 311, the second subsection 312 and the third subsection 313 protrude flush from the surface of the first surface 101 and together form the fourth surface 301.

The boss 3 further includes two second protrusions 320, where the two second protrusions 320 are disposed on opposite sides of the second section 314 along the width direction Y of the main body plate 1 and are connected to the first sub-section 311, and the protruding height of the second protrusions 320 with respect to the first surface 101 is lower than the protruding height of the first protrusions 310 with respect to the first surface 101. The first sub-section 311, the second section 314 and the two second protruding portions 320 have the overall shapes corresponding to the explosion-proof valve 24, and the first sub-section 311, the second section 314 and the two second protruding portions 320 are provided with the air holes 302, so that the plurality of air holes 302 can be arrayed integrally.

Referring to fig. 6, fig. 7a, and fig. 7d, a plurality of third thimble portions S3 are disposed on the first section and the second section 314, and the plurality of third thimble portions S3 on the first section are arranged at intervals along the width direction Y of the main body plate 1, and the plurality of third thimble portions S3 on the first protruding portion 310 are arranged in a triangle shape.

Specifically, the first sub-segment 311 of the first segment is provided with a plurality of third ejector pin portions S3, and the second sub-segment 312 and the third sub-segment 313 are provided with a plurality of second ejector pin portions S2. Fig. 7d shows that the plurality of third thimble portions S3 are divided into a plurality of groups, that is, a first group S3.1, a second group S3.2 and a third group S3.3, the third thimble portions S3 of the first group S3.1 are disposed on the third surface 201 and are disposed at equal intervals along the width direction Y of the main body plate 1, specifically, one third thimble portion S3 is disposed between two adjacent through holes 202 at the concave portion of the sinking table 2, and the third thimble portion S3 may be disposed at a junction with a portion that is not concave outside the concave portion of the sinking table 2. The third thimble portions S3 of the second set S3.2 are located at the intersections of the plurality of cross bars 111 and the plurality of vertical bars 112 of the fence 110, the cross bars 111 extend along the length direction X of the main body plate 1, the vertical bars 112 extend along the width direction Y of the main body plate 1, the third thimble portions S3 of the second set S3.2 are arranged in an array, wherein three third thimble portions S3 extending along the width direction Y of the main body plate 1 in the middle of the fence 110 and one third thimble portion S3 near the sinking table 2 side in the middle of the width direction Y of the main body plate 1 can be drawn into a triangle by auxiliary lines, the three third thimble portions S3 at the vertices of the triangle can play a role of uniform demolding of the core, and more third thimble portions S3 can be additionally arranged at positions other than the vertices of the triangle, such as 9 third thimble portions are arranged on the fence 110 shown in fig. 7d, which is arranged in three rows. The plurality of third ejector pin portions S3 of the third set S3.3 may refer to the arrangement of the plurality of third ejector pin portions S3 on the fence 110, or may be a triangle drawn by an auxiliary line, and the third ejector pin portions S3 at the vertex of the triangle may be used as the core for uniform demolding, and the rest may be further provided with more third ejector pin portions S3, so that the first convex portion 310 of the boss 3 may be uniformly demolded.

Alternatively, referring to fig. 6, 7a and 7d, the third ejector pin portion S3 on the third surface 201 is spaced from the through hole 202 by 1.6mm to 2.8mm. Specifically, the spacing may be 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, or the like, and may be other values, without limitation. In this range, the distance between the third thimble portion S3 and the through hole 202 is moderate, and the distance is neither too close nor too far, so that when the thimble is pushed to the third thimble portion S3 at this position, the plastic is uniformly stressed, and the sinking table 2 can uniformly demold the positions including the through hole 202. If the distance is smaller than 1.6mm, the third thimble portion S3 is too close to the through hole 202, and the thimble is easy to damage the plastic at the through hole 202; if the distance is larger than 2.8mm, the third ejector pin portion S3 may not be positioned, may overlap with the edge of the sinking table 2, may be too far from the through hole 202, and may be easily deformed because plastic near the through hole 202 is difficult to eject during ejection and demolding.

The third thimble portion S3 on the boss 3 is disposed between the plurality of ventilation holes 302, and the numerical value of the ventilation holes 302 may refer to the distance between the third thimble portion S3 on the sinking table 2 and the through hole 202, which is not limited.

Referring to fig. 6 and fig. 7a, in a specific embodiment, a plurality of first ejector pin portions S1, a plurality of second ejector pin portions S2 and a plurality of third ejector pin portions S3 are respectively disposed on the second lower plastic 22, three ejector pins with different sizes can be disposed corresponding to the three ejector pin portions, and the three ejector pins can apply ejection forces to the first ejector pin portions S1, the second ejector pin portions S2 and the third ejector pin portions S3 at the same time, so that the second lower plastic 22 is demolded at one time.

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 to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

The foregoing disclosure is only a preferred embodiment of the present application, and it is not intended to limit the scope of the claims, and one of ordinary skill in the art will understand that all or part of the processes for implementing the embodiments described above may be performed with equivalent changes in the claims of the present application and still fall within the scope of the present application.

Claims

1. A lower plastic, comprising:

a body plate including first and second opposed surfaces, the second surface for abutting a cover plate of the end cap assembly;

a sinking platform connected to one end of the main body plate in the length direction, the sinking platform protruding from the first surface;

the boss is connected with one end, far away from the sinking table, of the main body plate in the length direction, protrudes from the first surface and is used for being arranged opposite to the explosion-proof valve;

the pole stand is arranged on the main body plate, the pole stand protrudes out of the second surface, the pole stand is arranged close to the sinking platform, the pole stand is provided with a vent hole and a through hole, the vent hole and the through hole are arranged at intervals along the length direction of the main body plate, and the through hole is positioned at one side of the vent hole facing the sinking platform;

the main body plate, the sinking platform, the boss and the pole platform are of an integrated structure formed by an injection molding process, in front projection of the first surface, the lower plastic is symmetrical relative to a central axis, the central axis is a straight line extending along the length direction of the main body plate and positioned in the middle of the width direction of the main body plate, and the boss and the pole platform are intersected with the central axis;

The first surface is provided with a plurality of first thimble portions, the first thimble portions are symmetrical relative to the central axis, and the plane shape of the first thimble portions is circular;

the first thimble portions are arranged in a plurality of groups, at least two first thimble portions are arranged in each group at intervals along the width direction of the main body plate and are symmetrical relative to the central axis, and the plurality of groups are arranged at intervals along the length direction of the main body plate;

the first thimble portions in the first group are close to the edge of the pole platform and are distributed at intervals in the width direction of the main body plate with the through holes, at least part of the first thimble portions in the second group are close to the edge of the main body plate in the width direction and are distributed at intervals in the width direction of the main body plate with the positions between the vent holes and the through holes, and the first thimble portions in the third group are close to the edge of one end, connected with the boss, of the main body plate in the length direction and are close to the edge of the main body plate in the width direction.

2. The lower plastic of claim 1, wherein a surface topography of the first spike is different from a topography of the first surface, and wherein a surface roughness of the first spike is less than a surface roughness of the first surface.

3. The lower plastic according to claim 1, wherein a distance between the first thimble portion and the edge of the pole platform in the width direction of the main body plate is 0.6mm to 1.45mm; and a first group of first thimble portions are arranged in a range of 6mm-10mm offset to both sides of the length direction of the main body plate relative to the first reference by taking a straight line which passes through the center of the through hole and extends in the width direction of the main body plate as the first reference.

4. The lower plastic according to claim 1, wherein two edges of the width direction of the main body plate are provided with convex strips protruding from the first surface, and the distance between the second group of the first thimble portions and the convex strips in the width direction of the main body plate is 0.6mm-1.8mm; and a second group of first thimble portions are arranged in a range of 6mm-20mm offset to two sides of the length direction of the main body plate relative to the second reference by taking a straight line which passes through the center of the vent hole and the midpoint of a connecting line passing through the center of the vent hole and extends in the width direction of the main body plate as the second reference.

5. The lower plastic of claim 1, wherein a third set of the first thimble portions is aligned with a second set of the first thimble portions in a longitudinal direction of the body plate.

6. The lower plastic of claim 1, further comprising the first thimble portion facing the first group in a longitudinal direction of the body plate.

7. The lower plastic according to claim 1, wherein the plurality of first ejector pin portions further includes a fourth group, the fourth group of first ejector pin portions is aligned with the first group of first ejector pin portions in the longitudinal direction of the main body plate, and a straight line passing through the center of the vent hole and extending in the width direction of the main body plate is used as a third reference, and the fourth group of first ejector pin portions is arranged in a range of being offset from the third reference by 6mm to 10mm toward both sides in the longitudinal direction of the main body plate.

8. The lower plastic of claim 7, wherein at least one set of the first thimble portions is further disposed between a fourth set of the first thimble portions and a third set of the first thimble portions; and/or a group of first thimble portions are further arranged between the first group of first thimble portions and the sinking table.

9. The lower plastic of claim 1, wherein the top surface of the sinking platform protruding from the first surface is a third surface, the top surface of the boss protruding from the first surface is a fourth surface, and the third surface and the fourth surface are flush; the third surface and the fourth surface are respectively provided with a plurality of second thimble portions, the second thimble portions are symmetrical relative to the central axis, the second thimble portions are positioned on two opposite sides of the pole platform, the plane shape of the second thimble portions is circular, and the radius of the second thimble portions is smaller than that of the first thimble portions.

10. The lower plastic according to claim 9, wherein the sinking table is provided with a plurality of through holes penetrating to a third surface, the through holes are arranged at intervals along the width direction of the main body plate, a plurality of second thimble portions on the third surface are arranged among the through holes, the distance between the second thimble portions and the through holes is 0.8mm-1.45mm, and a straight line passing through the center of the through holes and extending along the width direction of the main body plate is a fourth reference, and the second thimble portions are arranged in a range of 6mm-10mm offset to both sides of the length direction of the main body plate relative to the fourth reference.

11. The lower plastic according to claim 10, wherein the boss is provided with a plurality of ventilation holes penetrating to the fourth surface, the plurality of ventilation holes are provided with the second thimble portions on the outer side of the main body plate in the width direction, and the second thimble portions on the fourth surface are opposite to at least part of the plurality of second thimble portions on the third surface.

12. The lower plastic of claim 11, wherein a fence is disposed on a sidewall of the vent hole, the fence has a fifth surface corresponding to the first surface, the third surface, the fourth surface, and the fifth surface are further each provided with a plurality of third thimble portions, the third thimble portions are symmetrical with respect to the central axis, the third thimble portions on the third surface and the fourth surface are located between the second thimble portions and the central axis, the third thimble portions on the third surface are located between the through holes, the third thimble portions on the fourth surface are located between the vent holes, and a radius of the third thimble portions is smaller than a radius of the second thimble portions.

13. The lower plastic of claim 12, wherein the barrier comprises a plurality of cross-connected rails and vertical bars, and the third spike is disposed at the intersection of the rails and the vertical bars.

14. The lower plastic of claim 12, wherein the boss comprises a first protruding portion in a T shape, the first protruding portion comprises a first section and a second section, the first section extends along the width direction of the main body plate, the second section extends along the length direction of the main body plate, the second section is connected to one side of the first section facing the sinking table, a plurality of ventilation holes are formed in the first section and the second section, the ventilation holes in the first section and the second section are arranged in an array, a plurality of third thimble portions are arranged in the first section and the second section, the third thimble portions in the first section are arranged at intervals along the width direction of the main body plate, and the third thimble portions in the first protruding portion are arranged in a triangle.

15. The lower plastic of claim 12, wherein a spacing between the third spike portion on the third surface and the through hole is 1.6mm-2.8mm.

16. An end cap assembly comprising a cover plate, an explosion proof valve and a lower plastic according to any one of claims 1 to 15, wherein the second surface of the body plate abuts the cover plate, the explosion proof valve is disposed on the cover plate, and the boss is opposite the explosion proof valve.

17. An energy storage device comprising a cell assembly, an adapter, and the end cap assembly of claim 16, the adapter connecting the cell assembly and the end cap assembly.

18. A powered device comprising the energy storage device of claim 17, the energy storage device providing power to the powered device.