Lower plastic member, end cover assembly, energy storage device, and electrical apparatus

Abstract

A lower plastic member (10), an end cover assembly, an energy storage device (1000), and an electrical apparatus. The lower plastic member (10) comprises a body (11) and suction portions (12); the body (11) is provided with a first surface (111) and a second surface (112) that face away from each other, and the first surface (111) is arranged on one side facing a top cover; the suction portions (12) are arranged on the first surface (111); the suction portions (12) each comprise a plurality of first ribs (122) and a plurality of second ribs (123); the plurality of first ribs (122) are parallel to each other and are arranged at intervals; the plurality of second ribs (123) are parallel to each other and are arranged at intervals; the plurality of first ribs (122) and the plurality of second ribs (123) are arranged in an intersecting mode; the plurality of first ribs (122) and the plurality of second ribs (123) define a plurality of recesses (121); the recesses (121) are recessed from the first surface (111) to the second surface (112).

Description

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

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 6, 2024, with application number 202410253862.9 and application name “Lower plastic, end cover assembly, energy storage device and electrical equipment”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of energy storage technology, and in particular to a lower plastic, an end cover assembly, an energy storage device and an electrical device. Background Art

[0003] Secondary batteries, also known as rechargeable batteries or storage batteries, are batteries that can be recharged after discharge to activate the active materials and continue to be used. The recyclable nature of secondary batteries has made them a key power source for electrical devices. As demand for secondary batteries increases, so too does the demand for their performance, particularly regarding energy density per unit volume. The thickness of the battery's end cap assembly is a key parameter affecting the battery's energy density per unit volume; excessive thickness reduces the battery's energy density per unit volume. Current end cap assemblies include a lower plastic layer that insulates the top cap from the terminal. This layer is typically designed to be very thin to increase the battery's energy density per unit volume.

[0004] Currently, the lower plastic is manufactured through an injection molding process, which is easily damaged by the pulling of the mold during demoulding, resulting in a low product yield. Summary of the Invention

[0005] The purpose of this application is to provide a lower plastic, an end cover assembly, an energy storage device and an electrical device to solve the problem that the lower plastic is easily damaged due to the pulling of the mold during demolding.

[0006] To achieve the purpose of this application, this application provides the following technical solutions:

[0007] In the first aspect, the present application provides a lower plastic, which is used for an end cover assembly of an energy storage device, including: a main body, having a first surface and a second surface opposite to each other, the first surface is arranged on the side facing the top cover; an adsorption portion, arranged on the first surface, the adsorption portion includes a plurality of first ribs and a plurality of second ribs, the plurality of first ribs are parallel to each other and arranged at intervals, the plurality of second ribs are parallel to each other and arranged at intervals, the plurality of first ribs and the plurality of second ribs are arranged crosswise, the plurality of first ribs and the plurality of second ribs are jointly enclosed to form a plurality of pits, and the pits are recessed from the first surface toward the second surface.

[0008] The lower plastic provided by the present application is provided with an adsorption portion, which is provided on the first surface and has a recessed depression from the first surface toward the second surface. During the mold release process, the recess forms a suction cup-like effect, which can increase the adsorption force between the lower plastic and the first mold. The pulling force of the second mold on the lower plastic is insufficient to separate the lower plastic from the first mold, thereby avoiding damage to the lower plastic and improving product yield. By providing multiple first ribs and multiple second ribs to form multiple recesses, multiple densely packed smaller recesses can have a more stable effect of increasing adsorption force with the mold than a single larger recess, which is more effective in avoiding damage to the lower plastic and improving product yield.

[0009] In a second aspect, the present application further provides an end cover assembly, comprising a top cover and a lower plastic according to any one of the various embodiments of the first aspect, wherein a first surface of the lower plastic faces the top cover.

[0010] In a third aspect, the present application further provides an energy storage device, comprising a shell, a battery cell assembly and the end cover assembly described in the second aspect, wherein the battery cell assembly is disposed in the shell, and the end cover assembly is connected to the shell.

[0011] In a fourth aspect, the present application further provides an electrical device, comprising an electrical device and the energy storage device described in the third aspect, wherein the energy storage device supplies power to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the implementation methods or the description of the prior art. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] FIG1 is a diagram showing a usage scenario of an energy storage device according to an embodiment;

[0014] FIG2 is a perspective view of the lower plastic of an embodiment and a partially enlarged view thereof;

[0015] FIG3 is a perspective view of the lower plastic of an embodiment from another perspective;

[0016] FIG4 is a schematic diagram of lower plastic injection molding according to an embodiment;

[0017] FIG5 is a schematic diagram of lower plastic injection molding and demoulding according to an embodiment;

[0018] FIG6 is a bottom view of the lower plastic of an embodiment;

[0019] FIG7 is a top view of the lower plastic and a partially enlarged view thereof in an embodiment;

[0020] FIG. 8 is a partial cross-sectional view of the lower plastic according to an embodiment.

[0021] Description of reference numerals:

[0022] 1000-energy storage device, 2000-photovoltaic panel, 3000-wind turbine, 4000-grid;

[0023] 10-lower plastic, 101-gate, 11-body, 111-first surface, 112-second surface, 12-adsorption part, 121-pit, 122-first rib, 123-second rib, 13-coding part, 14-pole boss, 141-first pole boss, 142-first pole hole, 143-first pole groove, 144-second pole boss, 145-second pole hole, 146-second pole groove, 147-avoidance gap, 15-clip, 151-extension part, 152-protrusion, 1 6-slider portion, 171-annular pushing portion, 172-first pushing point portion, 173-second pushing point portion, 174-third pushing point portion, 18-explosion-proof boss, 181-first boss, 182-third surface, 183-vent, 184-second boss, 185-fourth surface, 186-vent, 191-first sink, 192-fifth surface, 193-first leakage hole, 194-second sink, 195-sixth surface, 196-second leakage hole, 197-first reinforcing rib, 198-second reinforcing rib;

[0024] 201 - clamping surface, 21 - first mold, 211 - first shaping surface, 212 - first shaping groove, 213 - push hole, 22 - second mold, 221 - second shaping surface, 222 - second shaping groove, 223 - docking part, 224 - docking surface, 225 - pouring hole;

[0025] A1-first center line, A2-second center line, X-first direction, Y-second direction, Z-third direction. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0027] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be an intermediate component. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be an intermediate component.

[0028] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used in this application includes any and all combinations of one or more of the relevant listed items.

[0029] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0030] Please refer to Figure 1. The energy storage device 1000 provided in the embodiment of the present application is applied to an energy storage system, which includes an energy storage device 1000, an electric energy conversion device (photovoltaic panel 2000), a wind energy conversion device (wind turbine 3000), a power grid 4000, etc. The energy storage device 1000 can be used as an energy storage cabinet and can be installed outdoors. Specifically, the photovoltaic panel 2000 can convert solar energy into electric energy during the period of low electricity prices. The energy storage device 1000 is used to store the electric energy and supply it to the power grid 4000 during peak electricity consumption, or to supply power when the power grid 4000 is out of power / power outage. The wind energy conversion device (wind turbine 3000) can convert wind energy into electric energy. The energy storage device 1000 is used to store the electric energy and supply it to the power grid 4000 during peak electricity consumption, or to supply power when the power grid 4000 is out of power / power outage. Among them, the transmission of electric energy can be carried out using high-voltage cables.

[0031] There may be multiple energy storage devices 1000, each connected in series or in parallel. These devices 1000 are supported and electrically connected using an isolation plate (not shown). In this embodiment, "multiple" refers to two or more. An energy storage box may also be provided externally to the energy storage device 1000 to house the energy storage device 1000.

[0032] It is understood that the energy storage device 1000 may include, but is not limited to, single cells, battery modules, battery packs, and battery systems. The energy storage device provided in the embodiments of this application may be applied in, but is not limited to, the products listed above, or in other application forms. The embodiments of this application do not impose strict limitations on the application form of the energy storage device 1000.

[0033] Referring to Figure 1 , an embodiment of the present application provides an electrical device, including an electrical device and an energy storage device 1000 in the embodiment of the present application. Energy storage device 1000 supplies power to the electrical device. The electrical device can be a power generation-side device, a grid-side device, a base station-side device, a user-side device, or the like. Specifically, the electrical device can be any type of electrical load, without limitation.

[0034] 1 and 2 , an embodiment of the present application further provides an energy storage device 1000, comprising a housing (not shown), a battery cell assembly (not shown), and an end cap assembly (not shown) in any embodiment of the present application, wherein the battery cell assembly is disposed in the housing, and the end cap assembly is connected to the housing.

[0035] The shell can be a square shell and can be made of aluminum or steel without limitation. The shell has a storage space in which the battery cell assembly is accommodated. One or both ends of the storage space are open, and an end cap assembly is provided at the position of the opening. The end cap assembly is fixedly connected to the shell and closes the opening. The battery cell assembly can specifically include one or more battery cells, and the battery cells are connected to tabs. The end cap assembly can include a top cover (not shown), a lower plastic 10, a pole (not shown), an explosion-proof valve (not shown), etc. The lower plastic 10 is provided on the side of the top cover facing the battery cell assembly, and the pole is provided through the lower plastic 10 and the top cover, and the pole is insulated from the top cover. The pole is connected to the tab, and an external power supply is connected to the pole to charge the battery cell through the tab. The electrical energy of the battery cell can also be transmitted to an external electrical load through the tab and the pole. The explosion-proof valve is provided on the top cover. When the battery cell assembly generates a large amount of gas due to abnormal heat, the explosion-proof valve can burst open to release the gas to prevent the energy storage device from exploding.

[0036] 2 , the present invention also provides an end cap assembly, comprising a top cap and the lower plastic 10 of any embodiment of the present invention, with the first surface 111 of the lower plastic 10 facing the top cap. The end cap assembly can be referred to above and will not be further limited here.

[0037] The lower plastic 10 of the embodiment of the present application is described in detail below.

[0038] 2 and 3 , the present embodiment provides a lower plastic 10, comprising a body 11 and an adsorption portion 12. The lower plastic 10 is formed by injection molding, and all structures included in the lower plastic 10 described below are integral structures formed by injection molding.

[0039] The body 11 has a first surface 111 and a second surface 112 facing each other. The first surface 111 is located on the side facing the top cover, and the second surface 112 is located on the side facing the battery cell assembly. The body 11 is generally a thin sheet structure, and its first surface 111 and second surface 112 are generally flat and rectangular.

[0040] A coordinate system is established for ease of description. A first direction X is the length direction of the body 11, which also corresponds to the length direction of the first surface 111, the second surface 112, and the lower plastic 10. A second direction Y is the width direction of the body 11, which also corresponds to the width direction of the first surface 111, the second surface 112, and the lower plastic 10. A third direction Z is the thickness direction of the body 11, which is the relative direction between the first surface 111 and the second surface 112, and the thickness direction of the lower plastic 10.

[0041] Referring to Figures 2 and 7 , the adsorption portion 12 is disposed on the first surface 111 and includes a recess 121 that extends from the first surface 111 toward the second surface 112. The recess 121 is slightly recessed from the first surface 111 and does not extend through the second surface 112. Furthermore, the depth of the recess 121 is negligible relative to the thickness of the body 11. Therefore, the presence of the recess 121 does not affect the strength of the lower plastic 10.

[0042] Referring to Figures 3 and 4 , the lower plastic 10 is formed by injection molding after the first mold 21 (fixed mold) and the second mold 22 (movable mold) are molded together. The surface where the first mold 21 and the second mold 22 meet is the mold surface 201, as shown by the dotted line in Figure 4 . In this embodiment of the present application, the first mold 21 and the second mold 22 are connected in the third direction Z (the thickness direction of the lower plastic 10), and the mold surface 201 coincides with the first surface 111. After the injection molding is completed, the demolding direction is also the third direction Z.

[0043] The first mold 21 has a first shaping surface 211, which is planar and extends to the edge of the first mold 21. The first shaping surface 211 may be provided with a recessed first shaping groove 212, which corresponds to the structure protruding from the first surface 111 of the lower plastic 10. The number and shape of the first shaping grooves 212 can be adapted to the number and shape of the structures protruding from the first surface 111 of the lower plastic 10, and are not specifically limited thereto.

[0044] The second mold 22 has a second shaping surface 221. This second shaping surface 221 is planar but located in the center of the first mold 21, a certain distance from the edge of the first mold 21. The second shaping surface 221 may be provided with a recessed second shaping groove 222. The second shaping groove 222 corresponds to the structure protruding from the second surface 112 of the lower plastic member 10. The number and shape of the second shaping grooves 222 can be adjusted to suit the number and shape of the structures protruding from the second surface 112 of the lower plastic member 10, and are not particularly limited thereto.

[0045] The second mold 22 is also provided with a docking portion 223 protruding from the second shaping surface 221 on all four edges. The second shaping surface 221 can extend to connect with the side of the docking portion 223. The top surface of the docking portion 223 protruding from the first surface 111 is a docking surface 224. The docking surface 224 is used to be in close contact with the first shaping surface 211 of the first mold 21.

[0046] During injection molding, the first mold 21 and the second mold 22 are docked so that the docking surface 224 is in close contact with the first shaping surface 211. At this time, a gap is formed between the first shaping surface 211 and the second shaping surface 221 to form a cavity. The first shaping groove 212 and the second shaping groove 222 are connected to the cavity and together form a mold cavity. Molten plastic liquid is poured into the mold cavity. After the plastic liquid fills the mold cavity, it is cooled. After the plastic liquid cools and solidifies, the lower plastic 10 can be formed. Among them, the first shaping surface 211 is used to form the first surface 111 of the lower plastic 10, the second shaping surface 221 is used to form the second surface 112 of the lower plastic 10, the first shaping groove 212 is used to form a structure of the lower plastic 10 protruding from the first surface 111, and the second shaping groove 222 is used to form a structure of the lower plastic 10 protruding from the second surface 112.

[0047] During demolding, the second mold 22 is first moved away from the first mold 21 to separate the second mold 22 from the lower plastic 10. A push rod (not shown) is then used to push the lower plastic 10 away from the first mold 21 to separate the lower plastic 10 from the first mold 21. During this process, the second mold 22 exerts a certain pulling force on the lower plastic 10, potentially causing it to separate from the first mold 21. This can lead to local deformation and damage to the lower plastic 10, resulting in low product yield.

[0048] In the embodiment of the present application, during injection molding, there is no need to wait for the plastic to cool to room temperature before demolding. Instead, the plastic liquid only needs to be solidified and molded before demolding at a relatively high temperature, thereby improving production efficiency. Plastic that has not completely cooled to room temperature may leave traces and form specific shapes when subjected to external forces. Due to the optimization of the injection molding process, these traces do not affect the function of the lower plastic 10, but can significantly improve production efficiency.

[0049] In the embodiment of the present application, an adsorption portion 12 is provided on the first surface 111. The adsorption portion 12 has a pit 121. The pit 121 is also formed by a protruding structure (not shown) on the first mold 21 that protrudes from the first shaping surface 211. That is, before demolding, the protruding structure of the first mold 21 is embedded in the lower plastic 10.

[0050] Since the adsorption portion 12 is a residual structure after injection molding, it has a structure of a pit 121, which has a significant difference in shape compared to other areas of the first surface 111 and can be easily distinguished from other areas of the first surface 111. During the assembly process of the end cap assembly, the adsorption portion 12 can be used as an identification feature for the machine vision system of the automated production line to identify and position the lower plastic 10, which can facilitate rapid positioning of the lower plastic 10 and determine whether the position of the lower plastic 10 is accurate.

[0051] Furthermore, after the lower plastic 10 is assembled to form the energy storage device 1000, when electrolyte is added to the energy storage device 1000, a small amount of electrolyte spreads along the gap between the top cover and the lower plastic 10 and enters the aforementioned recess 121. The surface tension of the electrolyte fluid can adhere the lower plastic 10 and the top cover together. At this time, the area where the recess 121 is located forms a local enclosed space and is filled with electrolyte. When the lower plastic 10 tends to fall (i.e., when the lower plastic 10 is about to separate from the top cover), the recess 121 forms a negative pressure area to resist the downward trend of the lower plastic 10. The recess 121 filled with electrolyte prevents gas from entering and destroying the negative pressure area, thereby allowing the lower plastic 10 to be firmly adsorbed to the lower surface of the top cover (i.e., the surface of the top cover facing the lower plastic 10), thereby improving the structural strength of the end cap assembly and preventing deformation of the Mylar film welded to the side wall of the lower plastic 10.

[0052] Correspondingly, the lower surface of the top cover of the end cover assembly (i.e., the surface facing the lower plastic 10) is relatively smooth, with a surface roughness less than or equal to Ra3.2, so that the first surface 111 and the lower surface of the top cover are more tightly attached, and it is not easy for air leakage to destroy the negative pressure area.

[0053] Therefore, the lower plastic 10 provided in the embodiment of the present application is provided with an adsorption portion 12, which is provided on the first surface 111 and has a pit 121 that is recessed from the first surface 111 toward the second surface 112. During the demolding process, the pit 121 forms a suction cup-like effect, which can increase the adsorption force between the lower plastic 10 and the first mold 21. The pulling force of the second mold 22 on the lower plastic 10 is insufficient to separate the lower plastic 10 from the first mold 21, thereby avoiding damage to the lower plastic 10 and improving the product yield.

[0054] In one embodiment, referring to Figures 2 and 7 , the adsorption portion 12 includes a plurality of first ribs 122 and a plurality of second ribs 123. The plurality of first ribs 122 are parallel to each other and spaced apart, the plurality of second ribs 123 are parallel to each other and spaced apart, the plurality of first ribs 122 and the plurality of second ribs 123 are intersectingly arranged, and the plurality of first ribs 122 and the plurality of second ribs 123 together enclose a plurality of recesses 121.

[0055] Optionally, the first ribs 122 extend along the first direction X, the second ribs 123 extend along the second direction Y, a plurality of first ribs 122 are arranged at equal intervals in the second direction Y, and a plurality of second ribs 123 are arranged at equal intervals in the first direction X.

[0056] Alternatively, the plurality of first ribs 122 may be arranged at unequal intervals, and the plurality of second ribs 123 may be arranged at unequal intervals, which are not limited to the above.

[0057] The angle formed by the cross arrangement of the plurality of first ribs 122 and the plurality of second ribs 123 can be any angle other than 0°, such as 30°, 45°, 60°, 90°, etc., without limitation.

[0058] The first ribs 122 and the second ribs 123 may all be flush with the first surface 111, or may slightly protrude from the first surface 111 or be slightly recessed relative to the first surface 111, without limitation. The thicknesses of the first ribs 122 and the second ribs 123 may be equal or unequal, without limitation.

[0059] By providing a plurality of first ribs 122 and a plurality of second ribs 123 to form a plurality of dimples 121, a plurality of densely packed smaller dimples 121 can more stably increase the adsorption force with the first mold 21 (see Figures 4 and 5) compared to a single larger dimple 121, thereby preventing damage to the lower plastic 10 and improving product yield.

[0060] Optionally, the ends of the first rib 122 and the second rib 123 facing the top cover are sharp prism-shaped. Specifically, the thickness of the first rib 122 and the second rib 123 gradually decreases from the bottom wall of the pit 121 to the opening.

[0061] This arrangement allows the size of the opening of the pit 121 to be larger than the size at a deeper position in the depth direction of the pit 121, i.e., the pit 121 forms a flared structure. The flared structure formed by the pit 121 is related to the convex structure provided on the first mold 21, i.e., the top of the convex structure (corresponding to the bottom wall of the pit 121) is smaller in size, while the base (corresponding to the opening of the pit 121) is larger in size. In this way, when the lower plastic 10 is demolded from the first mold 21, when the lower plastic 10 and the first mold 21 are slightly separated, a gap is created between the convex structure corresponding to the pit 121 on the lower plastic 10 and the sidewall of the pit 121, facilitating air entry into the pit 121, preventing the first rib 122 and the second rib 123 from always being in close contact with the convex structure of the mold, reducing the large negative pressure generated between the pit 121 and the convex structure of the first mold 21, and facilitating demolding.

[0062] Optionally, referring to Figures 2 and 7 , the orthographic projection of the adsorption portion 12 on the first surface 111 is circular and has a diameter of 5 mm to 10 mm. The diameter of the adsorption portion 12 can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc., without limitation. Providing a circular adsorption portion 12 has a simple shape and is also easier to shape the raised structure on the first shaping surface 211 of the first mold 21 (see Figures 4 and 5 ) used to form the adsorption portion 12.

[0063] Alternatively, the orthographic projection of the adsorption portion 12 on the first surface 111 may be other shapes, which are not limited.

[0064] Optionally, with reference to Figures 2 and 7, the orthographic projection of the pit 121 on the first surface 111 is rectangular, with a length of 0.3mm-0.6mm and a width of 0.3mm-0.6mm. Among them, the shape of the orthographic projection of the pit 121 on the first surface 111 refers to the contour shape of the side walls around the pit 121. When the distance between two adjacent first ribs 122 is equal to the distance between two adjacent second ribs 123, the shape of the pit 121 is square. When the distance between two adjacent first ribs 122 is not equal to the distance between two adjacent second ribs 123, the shape of the pit 121 is rectangular. The length of the rectangle of the pit 121 can be 0.3mm, 0.4mm, 0.45mm, 0.5mm, 0.6mm, etc., without limitation, and the width can be 0.3mm, 0.4mm, 0.45mm, 0.5mm, 0.6mm, etc., without limitation.

[0065] It should be understood that near the four edges of the adsorption portion 12, the shape of the pit 121 is a partial rectangular shape rather than a complete rectangular shape. This is because the edge of the adsorption portion 12 intersects with the first rib 122 and the second rib 123, thereby dividing the rectangular shape.

[0066] The orthographic projection of the first surface 111 is in the shape of a pit 121 , and the length and width of the pit 121 are both set to 0.3mm-0.6mm, so that the pit 121 has a simple shape and a reasonable size, which is convenient for injection molding and mold making.

[0067] Alternatively, the orthographic projection of the pit 121 on the first surface 111 may be other non-rectangular shapes, and the length and width may be other values, which are not limited.

[0068] Optionally, referring to Figures 2 and 7 , the depth of the recess 121 from the first surface 111 is 0.2mm-0.3mm. The depth of the recess 121 can be 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.3mm, etc., without limitation. Due to the thinness of the body 11 of the lower plastic 10, a shallow recess 121 is provided. This increases the adhesion between the lower plastic 10 and the first mold 21 while reducing the impact of the recess 121 on the strength of the lower plastic 10.

[0069] Alternatively, the depth of the recess 121 from the first surface 111 may be other values, which is not limited.

[0070] In a specific embodiment, referring to Figures 2 and 7, the diameter of the adsorption portion 12 is 7 mm, the length of the rectangle of the positive projection of the pit 121 on the first surface 111 is 0.45 mm, the width of the rectangle is 0.45 mm, and the depth of the pit 121 from the first surface 111 is 0.25 mm.

[0071] Setting the above sizes of the adsorption portion 12 can increase the adsorption force between the lower plastic 10 and the mold, avoiding the lower plastic 10 from being bent, deformed, and damaged during demolding. The structure is simple, easy to manufacture, and low in cost.

[0072] In one embodiment, referring to FIG. 2 and FIG. 7 , there are multiple adsorption portions 12 , and the multiple adsorption portions 12 are symmetrical with respect to a center line extending along the width direction of the first surface 111 .

[0073] The first surface 111 has a first centerline A1 and a second centerline A2. The first centerline A1 extends along the length of the lower plastic 10, and the second centerline A2 extends along the width of the lower plastic 10. Multiple suction portions 12 are symmetrically arranged along the second centerline A2. This symmetrical arrangement of suction portions 12 simplifies the placement of the suction portions, facilitates mold production, and facilitates visual identification during subsequent assembly of the end cap assembly.

[0074] Optionally, referring to Figures 2 and 7, at least two adsorption portions 12 are provided on the same side of the center line extending in the width direction of the first surface 111 (i.e., the second center line A2), and the at least two adsorption portions 12 are at different distances from the center line extending in the width direction of the first surface 111 (i.e., the second center line A2).

[0075] For example, as shown in FIG7 , there are four adsorption portions 12, two of which are disposed near each of the two side edges of the body 11 in the width direction. The four adsorption portions 12 are asymmetrical relative to the first centerline A1, but symmetrical relative to the second centerline A2. The two adsorption portions 12 located on the same side of the second centerline A2 are staggered in the second direction Y, that is, the two adsorption portions 12 are separated by a distance L in the first direction X. Optionally, the separation distance L can be 3 mm to 3.5 mm, specifically 3 mm, 3.1 mm, 3.2 mm, 3.25 mm, 3.3 mm, 3.4 mm, 3.5 mm, etc., without limitation.

[0076] The provision of such a plurality of adsorption portions 12 provides a fool-proof function during the visual recognition of the automated production line machine during the assembly of the end cap assembly, thereby preventing the lower plastic 10 from being placed upside down.

[0077] In one embodiment, referring to FIG. 2 and FIG. 7 , the first surface 111 is provided with a coding portion 13 . The coding portion 13 has a preset shape. The preset shape includes at least one of numbers, letters, barcodes, and QR codes.

[0078] The coding portion 13 is similar to the aforementioned adsorption portion 12, and is also a structure remaining after injection molding. The shape of the coding portion 13 can be formed by a protrusion or depression from the first surface 111, and a corresponding shape can be provided on the first shaping surface 211 of the first mold 21 (refer to Figures 4 and 5), similar to the method of movable type printing, so that the coding portion 13 is formed on the lower plastic 10 after injection molding. The preset shape of the coding portion 13 can be set as needed. For example, the shape of the coding portion 13 can be a number, letter, etc. that can be directly recognized by the naked eye, or a bar code, QR code, etc. that can be recognized by scanning the terminal. By setting the coding portion 13 and being able to recognize the coding portion 13 by the naked eye or by scanning the code, the product category, production date, manufacturer name, and other characteristics of the lower plastic 10 can be obtained, which can facilitate the traceability of the lower plastic 10, and can facilitate the control of the production process and the tracing of quality problems.

[0079] Optionally, referring to FIG. 2 and FIG. 7 , there are multiple encoding units 13 , and the multiple encoding units 13 are arranged side by side.

[0080] Optionally, the encoding portion 13 may be roughly rectangular, with its length direction being the first direction X and its width direction being the second direction Y, and the plurality of encoding portions 13 being arranged in sequence along the second direction Y. Each encoding portion 13 may have a preset shape, and the preset shapes of the plurality of encoding portions 13 may be different, that is, each encoding portion 13 is capable of identifying a type of information, and the information identified by the plurality of encoding portions 13 is different. The lengths and widths of the plurality of encoding portions 13 are not limited and may be set as needed. For example, as shown in FIG7 , the widths of the plurality of encoding portions 13 (i.e., the dimensions along the second direction Y) are roughly equal, and the lengths of some number of encoding portions 13 (i.e., the dimensions along the first direction X) are longer, while the lengths of the remaining number of encoding portions 13 are shorter. For a plurality of encoding portions 13 of equal length, they may be set flush at both ends or staggered, without limitation.

[0081] During injection molding, multiple movable code blocks are provided on the first mold 21. Each code block is movable, and a corresponding shape is formed on the corresponding movable code block according to the preset shape corresponding to the information required to be recognized by each lower plastic 10. For example, for production date information, since the date is different every day, multiple movable code blocks are provided. Different movable code blocks can be replaced according to different dates, so that the coding portion 13 of the lower plastic 10 produced on different dates will display different dates. For other types of information, multiple replaceable movable code blocks can also be provided to display different information.

[0082] By providing a plurality of encoding parts 13 arranged side by side, different information can be displayed or identified in one place, making it convenient to trace various different information.

[0083] Optionally, the first surface 111 of the body 11 may be provided with multiple coding regions, each of which is provided with at least one coding portion 13. As shown in FIG7 , a coding region is provided on each of the left and right sides of the second centerline A2 (i.e., opposite sides along the first direction X), each of which is provided with multiple coding portions 13. The structures of the two coding regions are symmetrically arranged relative to the second centerline A2. The multiple coding regions can be configured to display different information or the same information, without limitation.

[0084] Optionally, referring to Figures 2 and 7 , there is a gap between adjacent encoding parts 13. Taking the multiple encoding parts 13 shown in Figure 7 as an example, the multiple encoding parts 13 are sequentially arranged along the second direction Y, and there is a gap between two adjacent encoding parts 13.

[0085] During demolding, after separating the second mold 22 from the first mold 21 and the lower plastic 10, the lower plastic 10 needs to be separated from the first mold 21. The multiple encoding parts 13 correspond to the multiple movable code blocks on the first mold 21. A gap is set between two adjacent encoding parts 13, that is, a gap is set between adjacent movable code blocks. In this way, air can enter the gap during demolding, avoiding the formation of local negative pressure between the movable code block and the lower plastic 10, reducing the demolding resistance between the lower plastic 10 and the first mold 21, and improving production efficiency.

[0086] In one embodiment, referring to FIG. 2 and FIG. 3 , the lower plastic 10 further includes a pole boss 14 , which is connected to the body 11 and protrudes from the first surface 111 . The pole boss 14 is provided with buckles 15 on both sides of the first surface 111 in the width direction.

[0087] Specifically, the pole boss 14 includes a first pole boss 141 and a second pole boss 144. The poles of the end cap assembly include a first pole (not shown) and a second pole (not shown), the first pole and the second pole having opposite polarities. The first pole boss 141 protrudes relative to the first surface 111 and is recessed relative to the second surface 112 to form a first pole recess 143. The first pole boss 141 defines a first pole hole 142 extending along the third direction Z. The first pole hole 142 is for receiving the first pole, and the first pole recess 143 is for accommodating a chassis structure (not shown) of the first pole. The second pole boss 144 protrudes relative to the first surface 111 and is recessed relative to the second surface 112 to form a second pole recess 146. The second pole boss 144 is provided with a second pole hole 145 extending along the third direction Z. The second pole hole 145 is used to allow the second pole to pass through, and the second pole recess 146 is used to accommodate the chassis structure (not shown) of the second pole. The first pole boss 141 is provided with a snap 15 on each side along the second direction Y, and the second pole boss 144 is also provided with a snap 15 on each side along the second direction Y, resulting in a total of four snaps 15 on the lower plastic 10. These four snaps 15 are symmetrical about the first centerline A1 and the second centerline A2. As described in the above embodiment, the pole boss, snap 15, etc. are also injection-molded together with the body 11, that is, the various structures of the lower plastic 10 are an integrated structure and will not be described in detail below.

[0088] When the lower plastic 10 is assembled with the top cover, the first surface 111 of the lower plastic 10 faces the top cover. The top cover can be provided with a groove to accommodate the terminal boss 14, ensuring a tight fit between the first surface 111 and the top cover. Furthermore, the top cover can be provided with a snap-fit ​​structure that mates with the buckle 15. When the first surface 111 of the lower plastic 10 is in close contact with the top cover, the buckle 15 engages with the snap-fit ​​structure, thereby enhancing the stability of the connection between the lower plastic 10 and the top cover.

[0089] A buckle 15 is provided on each side of the pole boss 14 along the second direction Y, so that the lower plastic 10 and the top cover can be connected through the buckle 15, thereby enhancing the connection stability between the lower plastic 10 and the top cover.

[0090] In one embodiment, referring to Figures 2 and 3, the buckle 15 includes an extension portion 151 and a protrusion 152, one end of the extension portion 151 is connected to the first surface 111 and extends in a direction away from the second surface 112, and the protrusion 152 is arranged at an end of the extension portion 151 away from the body 11 and protrudes from the surface of the protrusion 152 facing away from the pole boss 14.

[0091] With such a structure of the buckle 15 , the protrusion 152 and the pole boss 14 are opposite to each other in the second direction Y, which facilitates the buckle 15 to be connected to the top cover.

[0092] Optionally, referring to FIG2 , the pole boss 14 may be provided with escape notches 147 on opposite sides in the second direction Y. The escape notches 147 can accommodate at least part of the structure of the clip 15, and a distance is provided between the clip 15 and the inner wall of the escape notch 147. In this way, the space occupied by the clip 15 can be reduced while not affecting the function of the pole boss 14. When the clip 15 is engaged with the top cover, the protrusion 152 of the clip 15 is squeezed, causing the clip 15 to elastically deform away from the top of the first surface 111 toward the pole boss. The distance provided between the clip 15 and the escape notch 147 can prevent interference between the clip 15 and the pole boss.

[0093] Optionally, referring to FIG. 2 and FIG. 7 , the lower plastic 10 further includes a slider portion 16 , which is disposed on the first surface 111 and located on the side of the extension portion 151 facing away from the pole boss 14 . The slider portion 16 is configured to allow the slider to slide on the first surface 111 .

[0094] The slider portion 16 is similar to the aforementioned adsorption portion 12 and encoding portion 13, and is also a structure left behind when the mold acts on the first surface 111 during injection molding. In order to inject the buckle 15, a slider is provided on the first mold 21, and the slider can move in the second direction Y of the lower plastic 10. During injection molding, the slider is set to a position closer to the pole boss 14. When the injection molding is completed and the mold is demolded, if the slider is not moved and the lower plastic 10 is directly separated from the first mold 21, the slider will interfere with the raised portion 152 of the buckle 15 and it will be difficult to demold. Forced demolding may cause the raised portion 152 to be worn flat. Therefore, when demolding, the slider is moved along the second direction Y to a position away from the pole boss 14 to avoid the raised portion 152 of the buckle 15. The trace left on the first surface 111 by the slider sliding between the position during injection molding and the position during demolding is the slider portion 16.

[0095] The slider portion 16 may be a structure that is convex or concave relative to the first surface 111 , and its orthographic projection on the first surface 111 may be a rectangle or any other shape without limitation.

[0096] By providing the slider portion 16 , it is possible to avoid difficulty in demoulding or damage to the buckle 15 during demoulding.

[0097] In one embodiment, referring to FIG. 2 and FIG. 7 , the lower plastic 10 further includes an annular push portion 171 , which is disposed on the first surface 111 and surrounds the pole boss 14 . The annular push portion 171 is connected to or spaced from the slider portion 16 .

[0098] Referring to Figures 4 and 5 , the first mold 21 is provided with a push-out hole 213 extending through the thickness direction (i.e., the third direction Z) of the lower plastic 10. During the injection molding process, the push-out hole 213 can be blocked by a plunger or other structure to prevent the plastic liquid from entering the push-out hole 213. Upon demolding after injection molding, the plunger is removed and replaced with a push rod that extends into the push-out hole 213 to push the lower plastic 10 away from the first mold 21. The pressure from the push rod acts on the lower plastic 10, leaving traces of the push rod's action on the lower plastic 10. The annular push portion 171 in this embodiment is a trace left by this process, as are the various push-out points described below. These are all traces left by the use of a relatively high-temperature demolding process.

[0099] Because the structure of the pole boss 14 is relatively complex, a push rod is used to surround the pole boss 14 and push against the first surface 111, forming an annular push portion 171 around the pole boss. In this way, the complex pole boss 14 can be more evenly applied with force, ensuring that the pole boss 14 can be demoulded easily and avoiding damage.

[0100] Since the buckle 15 needs to be injection molded, a slider for injection molding is provided on the slider portion 16 . During demolding, the slider needs to be separated from the lower plastic 10 . Therefore, when the push rod acts on the first surface 111 , it cannot press the slider, but needs to contact the side of the slider or have a gap. Therefore, the remaining annular push portion 171 will be connected to or have a gap with the remaining slider portion 16 .

[0101] In one embodiment, referring to FIG. 2 , the lower plastic 10 further includes a plurality of first push-point portions 172 . The plurality of first push-point portions 172 are disposed on the first surface 111 and spaced apart from each other.

[0102] The first push point portion 172 is also a residual structure from the injection molding process, i.e., a trace left by the push rod impacting the first surface 111. The first push point portion 172 can be circular in shape, with a diameter ranging from 4.5 mm to 5 mm, specifically 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, 5 mm, etc. In one specific embodiment, the diameter of the first push point portion 172 is 4.85 mm. The first push point portion 172 can also have other shapes and sizes, without limitation.

[0103] By providing a plurality of first push points 172 spaced apart on the first surface 111 , a relatively uniform force can be applied to the first surface 111 , facilitating demoulding and preventing damage to the lower plastic 10 caused by local uneven force.

[0104] Optionally, referring to FIG. 7 and FIG. 8 , the first pushing point portion 172 is crater-shaped, with a middle portion being recessed relative to the first surface 111 and edges thereof being protruding relative to the first surface 111 .

[0105] Due to the high temperature demolding, the lower plastic 10 has not completely cooled to room temperature. Although the lower plastic 10 has solidified, it is relatively soft. When the push rod acts on the first surface 111, the first surface 111 will be slightly deformed under the pressure of the push rod, thereby forming a crater-like structure.

[0106] The crater-shaped first push point 172 has a concave depth that is negligible relative to the thickness of the body 11, and a protruding height relative to the first surface 111 that is also negligible relative to the thickness of the body 11. This shape of the first push point 172 allows for demolding at temperatures above room temperature, thereby improving production efficiency.

[0107] The structures of the subsequent pushing point portions are similar to the first pushing point portion 172 and are all crater-shaped, which will not be described in detail in the following text.

[0108] Optionally, the plurality of first push points 172 are symmetrical relative to the first center line A1 and the second center line A2. In this way, the plurality of first push points 172 can apply force to the lower plastic 10 more evenly, and the lower plastic 10 is not easily deformed during demolding.

[0109] Referring to Figures 2, 3, and 7, the lower plastic member 10 further includes an explosion-proof boss 18, which is disposed in the middle of the lengthwise direction of the body 11. The boss 18 is recessed relative to the first surface 111 and protrudes relative to the second surface 112. The bottom wall of the boss 18, recessed from the first surface 111, forms a third surface 182. This third surface 182 defines a vent hole 183 extending along the third direction Z. A plurality of second push-points 173 are spaced apart on the first and third surfaces 111, 182.

[0110] The explosion-proof boss 18 is directly opposite to the explosion-proof valve provided on the top cover. The explosion-proof boss 18 is recessed from the first surface 111 so that the explosion-proof boss 18 encloses a gas collecting chamber. The gas generated by the battery cell assembly can flow into the gas collecting chamber through the vent 183. If the air pressure in the gas collecting chamber is too high, the explosion-proof valve will be driven to burst open for gas release.

[0111] The specific structure of explosion-proof boss 18 is not limited. It extends generally along the second direction Y and can be symmetrical relative to first centerline A1 and second centerline A2, with the intersection of first centerline A1 and second centerline A2 located at explosion-proof boss 18. Vent 183 can be circular, square, or arcuate, without limitation. Vent 183 is a plurality of relatively small holes, forming a fence-like structure on explosion-proof boss 18. This ensures that explosion-proof boss 18 meets structural strength requirements, provides ventilation, and prevents foreign matter on the battery cell assembly from passing through vent 183 and potentially causing a short circuit with the top cover.

[0112] Second push point 173 is also a residual structure from the injection molding process, i.e., a trace left by the push rod acting on first surface 111 and third surface 182. Second push point 173 can be circular, with a diameter of 3 mm to 4 mm, specifically 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, etc. Second push point 173 can also have other shapes and sizes without limitation.

[0113] The second push point portion 173 on the first surface 111 can be located on two opposite sides of the aforementioned adsorption portion 12 in the first direction X. The push point portion on the third surface 182 can be located in the interval between the multiple ventilation holes 183, or can be located on the outside of the multiple ventilation holes 183 as a whole, without any restriction.

[0114] By providing a plurality of second push points 173 spaced apart on the first surface 111 and the third surface 182 , a relatively uniform force can be applied to the first surface 111 and the third surface 182 , facilitating demoulding and preventing damage to the lower plastic 10 caused by local uneven force.

[0115] Optionally, the plurality of second push points 173 are symmetrical relative to the first center line A1 and the second center line A2. In this way, the plurality of second push points 173 can apply force to the lower plastic 10 more evenly, and the lower plastic 10 is not easily deformed during demolding.

[0116] In one embodiment, referring to Figures 2, 3 and 7, the explosion-proof boss 18 includes a first boss 181 and a second boss 184. The first boss 181 is arranged in the middle of the width direction of the first surface 111, and the first boss 181 is connected to the second boss 184 at both ends of the width direction (second direction Y) of the first surface 111. The depth of the first boss 181 relative to the first surface 111 is less than the depth of the second boss 184 relative to the first surface 111. With the first surface 111 as a reference, the depth of the first boss 181 is shallower, and the depth of the second boss 184 is deeper. With the second surface 112 as a reference, the height of the first boss 181 is lower, and the height of the second boss 184 is higher.

[0117] Such an explosion-proof boss 18 structure is provided, with a first boss 181 having a lower height than the second surface 112 between the two second bosses 184. When installed on the energy storage device, a certain accommodation space can be formed at the first boss 181 between the two second bosses 184, which is convenient for accommodating partial structures such as the battery cell assembly, thereby making full use of the space and reducing the size of the energy storage device.

[0118] The bottom wall of the first boss 181 is the third surface 182, and the bottom wall of the second boss 184 recessed from the first surface 111 is the fourth surface 185. The fourth surface 185 is provided with a plurality of spaced apart air holes 186, and the fourth surface 185 is provided with a plurality of third push point portions 174 located in the intervals between the plurality of air holes 186.

[0119] The function of the vent hole 186 is similar to that of the vent hole 183, and is also used for ventilation. The shape of the vent hole 183 can be circular or other, and the size is not limited.

[0120] The third push point 174 is also a residual structure from the injection molding process, i.e., a trace left by the push rod acting on the fourth surface 185. The third push point 174 can be circular in shape, with a diameter ranging from 2 mm to 2.5 mm, specifically 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, etc. In one specific embodiment, the diameter of the third push point 174 is 2.25 mm. The third push point 174 can also have other shapes and sizes without limitation.

[0121] Depending on the arrangement of the plurality of vents 186, the plurality of third push points 174 can be symmetrical or asymmetrical relative to the first centerline A1 and the second centerline A2, without limitation. As shown in FIG7 , to allow for the vents 186, the four third push points 174 disposed on the fourth surface 185 (i.e., two on each of the two second bosses 184) are symmetrical relative to the first centerline A1 and asymmetrical relative to the second centerline A2.

[0122] By providing a plurality of third push points 174 spaced apart on the fourth surface 185 , a relatively uniform force can be applied to the fourth surface 185 , facilitating demoulding and preventing damage to the lower plastic 10 due to local uneven force.

[0123] In one embodiment, referring to Figures 2, 3 and 7, the lower plastic 10 further includes a first sink 191 and a second sink 194. The first sink 191 and the second sink 194 are respectively arranged at both ends of the length direction (i.e., the first direction X) of the main body 11, and are recessed from the first surface 111 and protrude from the second surface 112. The first sink 191 and the second sink 194 are arranged, and the top surfaces of the first sink 191 and the second sink 194 protruding from the second surface 112 can be used to contact the battery cell assembly, so that there is a certain space between the main body 11 and the battery cell assembly, which is convenient for accommodating structures such as tabs, so as to increase the space utilization of the energy storage device and reduce the size of the energy storage device. 7 , the first sink 191 may further include a plurality of first reinforcing ribs 197 extending along the first direction X and spaced apart along the second direction Y. The second sink 194 may further include a plurality of first reinforcing ribs 197 extending along the first direction X and spaced apart along the second direction Y. Both the first reinforcing ribs 197 and the second reinforcing ribs 198 are used to enhance the structural strength of the lower plastic 10 and are not subject to excessive restrictions.

[0124] The bottom wall of the first depression 191, which is recessed from the first surface 111, is the fifth surface 192. The bottom wall of the second depression 194, which is recessed from the first surface 111, is the sixth surface 195. Both the fifth surface 192 and the sixth surface 195 are provided with a plurality of spaced-apart liquid leakage holes. Both the fifth surface 192 and the sixth surface 195 are provided with a plurality of third push-point portions 174 located in the spaces between the plurality of liquid leakage holes.

[0125] The plurality of leakage holes include a plurality of first leakage holes 193 and a plurality of second leakage holes 196. The fifth surface 192 is provided with a plurality of first leakage holes 193, and the sixth surface 195 is provided with a plurality of second leakage holes 196. The leakage holes are used to allow electrolyte spilled on the first surface 111 during injection to flow through the injection holes to the battery cell assembly. The plurality of leakage holes can be spaced apart along the second direction Y, and the corresponding plurality of third push-point portions 174 can be disposed in the intervals between the plurality of leakage holes. A third push-point portion 174 can be disposed between two adjacent leakage holes, and a third push-point portion 174 can also be disposed outside the outermost leakage hole in the second direction Y. There are no limitations to this.

[0126] The plurality of third push points 174 provided on the fifth surface 192 and the sixth surface 195 may be symmetrical or asymmetrical relative to the first centerline A1 and the second centerline A2, without limitation. As shown in FIG7 , to allow for the leakage hole, the six third push points 174 provided on the fifth surface 192 and the six third push points 174 provided on the sixth surface 195 are asymmetrical relative to the first centerline A1, but symmetrical relative to the second centerline A2.

[0127] By providing a plurality of third push points 174 spaced apart on the fifth surface 192 and the sixth surface 195 , a relatively uniform force can be applied to the fifth surface 192 and the sixth surface 195 , facilitating demoulding and preventing damage to the lower plastic 10 due to local uneven force.

[0128] Referring to Figure 7 , the plurality of first push points 172, the plurality of second push points 173, and the plurality of third push points 174 can be evenly arranged on the entire lower plastic 10, so that the entire lower plastic 10 is subjected to relatively uniform force and is less likely to bend, deform, and be damaged during demolding. For example, the plurality of first push points 172 can be evenly arranged around the periphery of the terminal boss 14 and on opposite sides of the explosion-proof valve in the first direction X; the plurality of second push points 173 can be evenly arranged on opposite sides of the four adsorption portions 12 along the first direction X and on the third surface 182; and the plurality of third push points 174 can be evenly arranged on the fourth surface 185, the fifth surface 192, and the sixth surface 195.

[0129] 3 and 6 , the lower plastic 10 further includes a gate portion 101 . The gate portion 101 is located on a side of the second surface 112 facing away from the first surface 111 . The gate portion 101 is formed by residues left during the injection molding process of the lower plastic 10 .

[0130] Referring to Figures 4 and 5 , the second mold 22 is provided with a pouring hole 225 extending along a third direction Z. This pouring hole 225 communicates with the mold cavity and allows the flow of plastic liquid, thereby injecting the plastic liquid into the mold cavity. After the plastic liquid solidifies and forms, it is demolded. After demolding, a pouring mark remains on the lower plastic 10 at the location corresponding to the pouring hole 225, forming a gate portion 101. The gate portion 101 can be a protrusion, a groove, or other structure, without limitation. The shape and size of the gate portion 101 are also not limited.

[0131] A gate portion 101 is formed on the side of the second surface 112 facing away from the first surface 111, so that the first mold 21 and the second mold 22 are used for pouring plastic liquid and demolding with a push rod, respectively, with independent functions, thereby avoiding pouring plastic liquid and demolding with a push rod on the same mold at the same time, which may easily lead to misoperation and produce defects.

[0132] In one embodiment, referring to Figure 6, the explosion-proof boss 18 protruding from the top surface of the second surface 112 is provided with a gate portion 101, the first sink 191 protruding from the top surface of the second surface 112 is provided with a gate portion 101, and the second sink 194 protruding from the top surface of the second surface 112 is provided with a gate portion 101.

[0133] The gate 101 on the explosion-proof boss 18 can be located on the first boss 181 or the second boss 184 and needs to be offset from the vent 183 and the air hole 186. The gate 101 on the first sink 191 and the second sink 194 needs to be offset from the leakage hole.

[0134] The number of gate portions 101 can be one or more. If there is one, it can be provided on any one of the explosion-proof boss 18, the first sunken platform 191, and the second sunken platform 194. If there are multiple gate portions 101, they can be provided on at least two of the explosion-proof boss 18, the first sunken platform 191, and the second sunken platform 194. For example, as shown in FIG6 , one gate portion 101 is provided on each of the explosion-proof boss 18, the first sunken platform 191, and the second sunken platform 194.

[0135] Providing such a gate portion 101 can facilitate the injection molding process, avoid interference with the demoulding operation, and ensure product yield.

[0136] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", and "outside" are based on the orientation or positional relationship described in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present application.

[0137] The above disclosure is only a preferred embodiment of the present application, and certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present application are still within the scope covered by the present application.

Claims

1. A lower plastic, used for an end cap assembly of an energy storage device, wherein: include: The body has a first surface and a second surface opposite to each other, wherein the first surface is arranged on a side facing the top cover; The adsorption portion is arranged on the first surface, and the adsorption portion includes a plurality of first ribs and a plurality of second ribs. The plurality of first ribs are parallel to each other and spaced apart, the plurality of second ribs are parallel to each other and spaced apart, the plurality of first ribs and the plurality of second ribs are cross-arranged, and the plurality of first ribs and the plurality of second ribs are jointly enclosed to form a plurality of pits, and the pits are recessed from the first surface toward the second surface.

2. The lower plastic according to claim 1, wherein: Ends of the first rib and the second rib facing the top cover are sharp-edged.

3. The lower plastic according to claim 1, wherein: The orthographic projection of the adsorption portion on the first surface is circular, and the diameter is 5mm-10mm; the orthographic projection of the pit on the first surface is rectangular, and the length is 0.3mm-0.6mm, and the width is 0.3mm-0.6mm; the depth of the pit from the first surface is 0.2mm-0.3mm.

4. The lower plastic according to claim 1, wherein: There are a plurality of adsorption portions, and the plurality of adsorption portions are symmetrical with respect to a center line extending along the width direction of the first surface.

5. The lower plastic according to claim 4, wherein: At least two adsorption portions are provided on the same side of a center line extending along the width direction of the first surface, and the at least two adsorption portions are at different distances from the center line extending along the width direction of the first surface.

6. The lower plastic according to claim 1, wherein: The first surface is provided with a coding portion, and the coding portion has a preset shape, and the preset shape includes at least one of numbers, letters, barcodes, and QR codes.

7. The lower plastic according to claim 6, wherein: There are multiple encoding units, and the multiple encoding units are arranged side by side.

8. The lower plastic according to claim 7, wherein: There is a gap between adjacent encoding parts.

9. The lower plastic according to claim 1, wherein: The lower plastic further includes a pole boss, which is connected to the body and protrudes from the first surface. The pole boss is provided with buckles on both sides of the first surface in a width direction.

10. The lower plastic according to claim 9, wherein: The clip includes an extension portion and a protrusion portion, one end of the extension portion is connected to the first surface and extends in a direction away from the second surface, and the protrusion portion is arranged at an end of the extension portion away from the main body and protrudes from the surface of the protrusion portion facing away from the pole boss.

11. The lower plastic according to claim 10, wherein: The lower plastic further includes a slider portion, which is disposed on the first surface and located on a side of the extension portion facing away from the pole boss. The slider portion is used for allowing the slider to slide on the first surface.

12. The lower plastic according to claim 11, wherein: The lower plastic further includes an annular pushing portion, which is arranged on the first surface and surrounds the pole boss. The annular pushing portion is connected to the slider portion or has a spacing therebetween.

13. The lower plastic according to claim 1, wherein: The lower plastic further includes a plurality of first push point portions, which are arranged on the first surface and spaced apart from each other.

14. The lower plastic according to claim 13, wherein: The lower plastic also includes an explosion-proof boss, which is arranged in the middle of the length direction of the body, and the explosion-proof boss is recessed relative to the first surface and protrudes relative to the second surface. The bottom wall of the explosion-proof boss recessed from the first surface is the third surface, and the third surface is provided with a vent hole. The first surface and the third surface are provided with a plurality of second push point portions arranged at intervals.

15. The lower plastic according to claim 14, wherein: The center line extending along the length direction of the first surface is the first center line, the center line extending along the width direction of the first surface is the second center line, and multiple first push point portions are symmetrical relative to the first center line and the second center line, and / or multiple second push point portions are symmetrical relative to the first center line and the second center line.

16. The lower plastic according to claim 14, wherein: The explosion-proof boss includes a first boss and a second boss, the first boss is arranged in the middle of the width direction of the first surface, the first boss is connected to the second boss at both ends of the width direction of the first surface, the depth of the first boss relative to the first surface is less than the depth of the second boss relative to the first surface, the bottom wall of the first boss is the third surface, the bottom wall of the second boss recessed from the first surface is the fourth surface, the fourth surface is provided with a plurality of spaced air holes, and the fourth surface is provided with a plurality of third push point portions located in the intervals between the plurality of air holes.

17. The lower plastic according to claim 16, wherein: The lower plastic also includes a first sinker and a second sinker, which are respectively arranged at the two ends of the body in the length direction, and are recessed from the first surface and protruding from the second surface. The bottom wall of the first sinker recessed from the first surface is the fifth surface, and the bottom wall of the second sinker recessed from the first surface is the sixth surface. The fifth surface and the sixth surface are both provided with a plurality of leakage holes arranged at intervals, and the fifth surface and the sixth surface are both provided with a plurality of the third push point portions located in the intervals between the plurality of leakage holes.

18. The lower plastic according to claim 13, wherein: The first push point portion is crater-shaped, with a middle portion being concave relative to the first surface and edges thereof being convex relative to the first surface.

19. The lower plastic according to claim 1, wherein: The lower plastic further includes a gate portion, which is located on a side of the second surface facing away from the first surface. The gate portion is formed by residues during the injection molding process of the lower plastic.

20. The lower plastic according to claim 19, wherein: The lower plastic also includes an explosion-proof boss, a first sinker and a second sinker. The explosion-proof boss is arranged in the middle of the length direction of the body, and the first sinker and the second sinker are respectively arranged at both ends of the length direction of the body. The explosion-proof boss, the first sinker and the second sinker are all recessed from the first surface and protrude from the second surface. The top surface of the explosion-proof boss protruding from the second surface is provided with the gate part, the top surface of the first sinker protruding from the second surface is provided with the gate part, and the top surface of the second sinker protruding from the second surface is provided with the gate part.

21. An end cap assembly, wherein: It comprises a top cover and the lower plastic according to any one of claims 1 to 20, wherein the first surface of the lower plastic faces the top cover.

22. An energy storage device, wherein: It comprises a shell, a battery cell assembly and an end cover assembly as claimed in claim 21, wherein the battery cell assembly is arranged in the shell, and the end cover assembly is connected to the shell.

23. An electrical device, wherein: It comprises an electric device and an energy storage device as claimed in claim 22, wherein the energy storage device supplies power to the electric device.

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