A lower plastic, end cover assembly, energy storage device and electrical equipment

Abstract

The embodiments of the present application provide a lower plastic, an end cover assembly, an energy storage device, and an electrical device. The lower plastic includes a lower plastic body, a first rib, a plurality of first convex ribs, a second rib, a plurality of second convex ribs, a plurality of first convex columns, and a plurality of second convex columns. The lower plastic body includes a first surface and a second surface disposed in back-to-back relationship. The first rib and the plurality of first convex ribs are located at one end of the first surface, and the second rib and the plurality of second convex ribs are located at the other end of the first surface. The first rib and the second rib extend along the width direction of the lower plastic, the plurality of first convex ribs and the plurality of second convex ribs are spaced apart along the width direction of the lower plastic and extend along the length direction of the lower plastic, the plurality of first convex ribs intersect with the first ribs, and the plurality of second convex ribs intersect with the second ribs. Each first convex column is at least protruded from the first rib, and each second convex column is at least protruded from the second rib. The first convex column and the second convex column are asymmetric with respect to the central axis extending in the width direction of the lower plastic.

Description

Technical Field

[0001] 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 electrical equipment. Background Art

[0002] With the rapid development of energy storage technology, people have increasingly stringent requirements for the structure of secondary batteries. Typically, secondary batteries include end cap assemblies, which include insulating members for insulating the end caps from the battery cells. Existing methods for assembling and positioning the insulating members and end caps in end cap assemblies suffer from low assembly strength and efficiency. Summary of the Invention

[0003] The present application provides a lower plastic, an end cover assembly, an energy storage device and an electrical device, which can improve the assembly strength and assembly efficiency of the insulating part and the end cover of the end cover assembly during assembly.

[0004] In a first aspect, an embodiment of the present application provides a lower plastic. The lower plastic includes a lower plastic body, the lower plastic body includes a first surface and a second surface, the first surface and the second surface are arranged in opposite directions along the thickness direction of the lower plastic body;

[0005] The lower plastic further includes a first rib, a plurality of first convex ribs, a second rib, and a plurality of second convex ribs. In the length direction of the lower plastic body, the first rib and the plurality of first convex ribs are located at one end of the first surface, and the second rib and the plurality of second convex ribs are located at the other end of the first surface.

[0006] The first ribs and the second ribs extend along the width direction of the lower plastic body, a plurality of the first convex ribs and a plurality of the second convex ribs are arranged at intervals along the width direction of the lower plastic body and extend along the length direction of the lower plastic body, a plurality of the first convex ribs are arranged to intersect with the first ribs, and a plurality of the second convex ribs are arranged to intersect with the second ribs;

[0007] The lower plastic further includes a plurality of first protrusions and a plurality of second protrusions, each of the first protrusions being protruded from a surface of the first rib in the thickness direction of the lower plastic body, and each of the second protrusions being protruded from a surface of the second rib in the thickness direction of the lower plastic body, and the first protrusions and the second protrusions being asymmetric about a central axis extending in the width direction of the lower plastic body.

[0008] In one embodiment, the first protrusion is provided at the intersection of the first protrusion and the first rib, and the first protrusion is located on a surface away from the first surface at the intersection of the first protrusion and the first rib;

[0009] Each of the second protrusions is disposed at the intersection of the second rib and the second convex rib, and each of the second protrusions is located on a surface away from the first surface at the intersection of the second convex rib and the second rib.

[0010] In one embodiment, the lower plastic further includes a first recess and a second recess located at both ends of the lower plastic body in the longitudinal direction, the first recess and the second recess are recessed in the first surface, the first rib and the plurality of first ribs are protruded from the first recess and extend away from the first surface, the first rib and the plurality of first ribs are connected to the sidewall of the first recess, the second rib and the plurality of second ribs are protruded from the second recess and extend away from the first surface, and the second rib and the plurality of second ribs are connected to the sidewall of the second recess;

[0011] The sidewall of the first recess, the plurality of the first ribs and the first rib form two grooves and a first receiving groove, the two grooves are located on both sides of the width direction of the lower plastic body, and the first receiving groove is located between the two grooves;

[0012] The sidewall of the second recess, the plurality of second convex ribs and the second ribs form two sub-grooves and a second accommodating groove; the two sub-grooves are located on both sides of the width direction of the lower plastic body, and the second accommodating groove is located between the two sub-grooves.

[0013] In one embodiment, the groove includes a first groove and a second groove, the first groove and the second groove are spaced apart along the length direction of the lower plastic body, and the first groove is farther away from the middle of the lower plastic body than the second groove;

[0014] The sub-grooves include a first sub-groove and a second sub-groove, the first sub-groove and the second sub-groove being spaced apart along the length direction of the lower plastic body, and the first sub-groove being farther away from the middle portion of the lower plastic body than the second sub-groove;

[0015] The groove area of ​​the first sub-groove is different from the groove area of ​​the first groove, and the groove area of ​​the second sub-groove is different from the groove area of ​​the second groove.

[0016] In one embodiment, the first rib includes a first sub-rib and a second sub-rib, the first sub-rib and the second sub-rib are spaced apart along the length direction of the lower plastic body, the first sub-rib and the second sub-rib are both connected to opposite side walls of the first recess along the width direction of the lower plastic body, and the first sub-rib is farther away from the middle of the lower plastic body than the second sub-rib;

[0017] The first sub-rib, the sidewall of the first recess, and the first rib adjacent to the sidewall of the first recess along the width direction of the lower plastic body together form the first groove; the second sub-rib, the sidewall of the second recess, and the second rib adjacent to the sidewall of the second recess along the width direction of the lower plastic body together form the second groove;

[0018] The second rib includes a third sub-rib and a fourth sub-rib, the third sub-rib and the fourth sub-rib are arranged at intervals along the length direction of the lower plastic body, the third sub-rib and the fourth sub-rib are both connected to opposite side walls of the second recess along the width direction of the lower plastic body, and the third sub-rib is farther away from the middle of the lower plastic body than the fourth sub-rib;

[0019] The third sub-rib, the sidewall of the second recess, and the first convex rib adjacent to the sidewall of the second recess along the width direction of the lower plastic body together form the first sub-groove, and the fourth sub-rib, the sidewall of the second recess, and the second convex rib adjacent to the sidewall of the second recess along the width direction of the lower plastic body together form the second sub-groove.

[0020] In one embodiment, the groove area of ​​the first sub-groove is larger than the groove area of ​​the first groove, and the groove area of ​​the second sub-groove is larger than the groove area of ​​the second groove.

[0021] In one embodiment, the sidewall of the first recess further includes a first sidewall, the first sidewall extending along the width direction of the lower plastic body, and the first sidewall is located on a side of the second sub-rib facing away from the first sub-rib, and is spaced apart from the second sub-rib;

[0022] The sidewall of the second recess further includes a second sidewall, the second sidewall extending along the width direction of the lower plastic body, and the second sidewall is located on a side of the fourth sub-rib facing away from the third sub-rib, and is spaced apart from the fourth sub-rib;

[0023] The lower plastic also includes a first reflow groove and a second reflow groove, the first side wall and the second sub-rib constitute part of the groove side wall of the first reflow groove, the groove bottom wall of the first reflow groove is provided with a first guide hole, the second side wall and the fourth sub-rib constitute part of the groove side wall of the second reflow groove, and the groove bottom wall of the second reflow groove is provided with a second guide hole.

[0024] In a second aspect, embodiments of the present application provide an end cap assembly. The end cap assembly includes an end cap and a lower plastic member, wherein a plurality of receiving grooves are recessed on a surface of the end cap in a thickness direction thereof, the lower plastic member and the end cap are stacked and connected along the thickness direction of the end cap assembly, and the plurality of first protrusions and the plurality of second protrusions of the lower plastic member are respectively accommodated in the plurality of receiving grooves.

[0025] In a third aspect, embodiments of the present application provide an energy storage device comprising a housing, a battery cell, and the end cap assembly, wherein the battery cell is mounted in the housing, and the end cap assembly is mounted on one side of the battery cell in the height direction and sealed at the opening of the housing.

[0026] In a fourth aspect, an embodiment of the present application provides an electric device, wherein the electric device includes the energy storage device, and the energy storage device is used to supply power to the electric device.

[0027] In the related art, the existing assembly and positioning method of the insulating member and the end cover of the end cover assembly has the problems of low assembly strength and low assembly efficiency.

[0028] In an embodiment of the present application, a plurality of ribs and a plurality of protruding ribs are provided on the surface of the lower plastic in the thickness direction, thereby improving the structural strength of the lower plastic. The protruding ribs and the ribs intersect, and the protruding column is provided on the same side of the lower plastic in the thickness direction as the ribs and the protruding ribs, and the protruding column is provided on the ribs. The ribs can strengthen the structural strength of the protruding column. Furthermore, the protruding column can be provided at the intersection of the protruding ribs and the ribs. The cooperation between the protruding ribs and the ribs further strengthens the structural strength of the protruding column, and also increases the assembly strength of the lower plastic and the end cap during assembly and positioning, thereby improving the assembly efficiency of the lower plastic and the end cap. If the lower plastic and the end cap are misaligned after assembly, it can be discovered from the final assembly state, rather than being forcibly installed after the misalignment occurs, which may cause the protruding column to break, but after the breakage, it cannot be observed from the assembled state. At the same time, the multiple protruding columns are asymmetrically arranged about the central axis extending in the width direction of the lower plastic, which plays a role in preventing assembly errors and improving the assembly accuracy of the lower plastic and the end cap. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of an application scenario of the energy storage device provided in an embodiment of the present application;

[0030] Figure 2 for Figure 1 A schematic structural diagram of the energy storage device;

[0031] Figure 3 for Figure 2 An exploded structural diagram of a portion of the end cap assembly shown;

[0032] Figure 4 for Figure 3The end cap of the end cap assembly shown is a schematic structural diagram at another angle;

[0033] Figure 5 for Figure 3 A schematic diagram of the structure of the lower plastic of the end cap assembly shown at another angle;

[0034] Figure 6 for Figure 5 The lower plastic is shown in a partially enlarged view at position E;

[0035] Figure 7 for Figure 3 A schematic cross-sectional view of the lower plastic portion of the end cap assembly along line AA is shown;

[0036] Figure 8 for Figure 7 The enlarged view of the lower plastic at F is shown;

[0037] Figure 9 for Figure 7 The lower plastic is shown in a partially enlarged view at position G;

[0038] Figure 10 for Figure 3 A top view of the lower plastic of the end cap assembly is shown.

[0039] The nouns corresponding to the reference numerals in the figures are: energy storage device 1000, housing 200, opening 201, end cap assembly 100, end cap 10, upper surface 11, lower surface 12, first through hole 13, second through hole 14, pressure relief hole 15, liquid injection hole 16, receiving groove 17, lower plastic 20, lower plastic body 21, first surface 211, second surface 212, first pole through hole 22, second pole through hole 23, explosion-proof portion 24, explosion-proof fence 24 1. Explosion-proof boss 242, liquid injection portion 25, liquid injection through hole 251, diverter 252, extension portion 253, blocking portion 254, diverter hole 255, first recess 26, first concave surface 261, first sub-concave surface 261a, second sub-concave surface 261b, first side wall 262, third side wall 263, first convex portion 27, first convex surface 271, first sub-convex surface 271a, second sub-convex surface 271b, first guide hole 28, second recess 29 , second concave surface 291, third sub-concave surface 291a, fourth sub-concave surface 291b, second side wall 292, fourth side wall 293, second convex portion 30, second convex surface 311, third sub-convex surface 311a, fourth sub-convex surface 311b, second guide hole 32, first rib a, first sub-rib a1, second sub-rib a2, first rib c, first reflow groove M, groove 34, first groove 341, second groove 342, second rib b, third Sub-rib b1, fourth sub-rib b2, second rib d, second reflux groove N, sub-groove 35, first sub-groove 351, second sub-groove 352, first convex column 36, second convex column 37, first accommodating groove m, second accommodating groove n, first pole 40, second pole 50, explosion-proof valve 60, second electrical equipment 2000, first electrical equipment 3000, first electric energy conversion device 4100, second electric energy conversion device 4200, energy storage system 5000. DETAILED DESCRIPTION

[0040] 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 in 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.

[0041] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," and the like should be interpreted broadly. For example, they can be fixedly connected, removably connected, or integrated; they can be mechanically connected, electrically connected, or communicative; they can be directly connected or indirectly connected through an intermediate medium; they can be internally connected between two elements or interact with each other, unless otherwise specified or limited. Furthermore, the terms "same," "equal," and "parallel" used below are subject to certain tolerances.

[0042] It should be noted that the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first," "second," etc. may explicitly or implicitly include at least one of such features.

[0043] See also Figure 1 , Figure 1 It is a schematic diagram of an application scenario of the energy storage device provided in an embodiment of the present application.

[0044] The energy storage device 1000 provided in an embodiment of the present application is applied to an energy storage system 5000, which includes a first power conversion device 4100 (photovoltaic panel), a second power conversion device 4200 (wind turbine), a first power user 3000 (grid), a second power user 2000 (base station), and the energy storage device 1000. The energy storage system 5000 also includes an energy storage cabinet, in which the energy storage device 1000 is installed. The energy storage cabinet can be installed outdoors. Specifically, the first power conversion device 4100 can convert solar energy into electrical energy during periods of low electricity prices. The energy storage device 1000 is used to store this electrical energy and supply it to the first power user 3000 or the second power user 2000 during peak electricity consumption, or to provide power when the first power user 3000 or the second power user 2000 is powered off / out of power. The second power conversion device 4200 can convert wind energy into electrical energy. The energy storage device 1000 is used to store this electrical energy and supply it to the first power device 3000 or the second power device 2000 during peak power consumption, or to supply power when the first power device 3000 or the second power device 2000 is powered off / out of power. The electrical energy can be transmitted using high-voltage cables.

[0045] It should be noted that the first power-consuming device 3000, the second power-consuming device 2000 and other devices including the energy storage device 1000 can be understood as power-consuming devices. The energy storage device 1000 provides power to the power-consuming devices.

[0046] There may be multiple energy storage devices 1000, and multiple energy storage devices 1000 may be connected in series or in parallel. In this embodiment, "multiple" refers to two or more.

[0047] It is understood that the energy storage device 1000 may include but is not limited to single cells, battery modules, battery packs, battery systems, etc. The actual application form of the energy storage device 1000 provided in the embodiment of the present application may be, but is not limited to, the products listed, and may also be other application forms. Optionally, the single cell may be a secondary battery, which refers to a battery cell that can be recharged to activate the active material after the single cell is discharged and continue to be used. The single cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium metal battery, a sodium metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and this application does not make specific limitations on this.

[0048] When the energy storage device 1000 is a single battery, it can be a cylindrical battery, a square battery, or batteries of other shapes. In this embodiment, the energy storage device 1000 is a square battery.

[0049] See also Figure 2 , Figure 2 for Figure 1 A schematic structural diagram of the energy storage device.

[0050] For ease of description, the width direction of the energy storage device 1000 is defined as the X-axis direction, the length direction as the Y-axis direction, and the height direction as the Z-axis direction.

[0051] The directional terms such as "upper", "lower", "bottom", "right", and "left" mentioned in the description of the embodiments of the present application are based on the Figure 2 The description of the directions shown does not limit the actual application scenarios of the energy storage device 1000. Specifically, the positive direction toward the Z axis is the top or upper part of the energy storage device 1000, and the negative direction toward the Z axis is the bottom or lower part of the energy storage device 1000.

[0052] Energy storage device 1000 includes a housing 200, an end cap assembly 100, and a battery cell. Housing 200 includes an opening 201 and a receiving cavity. Opening 201 communicates with the receiving cavity. The battery cell is housed within the receiving cavity. End cap assembly 100 is mounted at one end of the battery cell in the height direction and seals against opening 201 to isolate the internal environment of energy storage device 1000 from the external environment.

[0053] Please refer to Figure 2 and Figure 3 , Figure 3 for Figure 2 A schematic diagram of the exploded structure of part of the end cap assembly is shown.

[0054] like Figure 2 and Figure 3As shown, the end cap assembly 100 includes an end cap 10, a lower plastic 20, a first pole 40, a second pole 50, and an explosion-proof valve 60. The explosion-proof valve 60 is connected to the end cap 10. The lower plastic 20 and the end cap 10 are stacked along the thickness direction of the end cap assembly 100. The length direction of the lower plastic 20 is the same as or approximately the same as the length direction of the end cap 10, and the width direction of the lower plastic 20 is the same as or approximately the same as the width direction of the end cap 10. The first pole 40 and the second pole 50 are respectively located at opposite ends of the length direction of the end cap assembly 100. The first pole 40 and the second pole 50 are both provided through the end cap 10 and the lower plastic 20. The first pole 40 and the second pole 50 are both insulated and sealed from the end cap 10 by an insulating member (not shown).

[0055] In this embodiment, the end cap 10 is roughly a long rectangular plate, and the end cap 10 is a plain aluminum part. The lower plastic 20 is roughly a long rectangular plate, and the lower plastic 20 can be made of an insulating material such as plastic or rubber. The lower plastic 20 is used to insulate the battery cell from the end cap 10. The structure of the first pole 40 is different from that of the second pole 50. The first pole 40 can be a negative pole, and the second pole 50 can be a positive pole. In some embodiments, the first pole 40 can be a positive pole, and the second pole 50 can be a negative pole.

[0056] Please refer to Figure 4 , Figure 4 for Figure 3 The end cover of the end cover assembly shown is a schematic structural diagram at another angle.

[0057] The end cap 10 includes an upper surface 11 and a lower surface 12. The upper surface 11 and the lower surface 12 are disposed opposite to each other along the thickness direction of the end cap 10.

[0058] The end cap 10 further includes a first through hole 13, a second through hole 14, a pressure relief hole 15, and a liquid injection hole 16. The first through hole 13, the second through hole 14, the pressure relief hole 15, and the liquid injection hole 16 all pass through the upper surface 11 and the lower surface 12 of the end cap 10. The first through hole 13 and the second through hole 14 are respectively located at opposite ends of the length direction of the end cap 10. The first through hole 13 is used for allowing the first pole 40 to pass through. The second through hole 14 is used for allowing the second pole 50 to pass through. The pressure relief hole 15 and the liquid injection hole 16 are both located between the first through hole 13 and the second through hole 14. The pressure relief hole 15 is spaced apart from the first through hole 13 and the second through hole 14. The liquid injection hole 16 is located between the second through hole 14 and the pressure relief hole 15, and the liquid injection hole 16 is spaced apart from the pressure relief hole 15 and the second through hole 14. The pressure relief hole 15 is used to accommodate the explosion-proof valve 60. The liquid injection hole 16 is used to inject electrolyte into the interior of the energy storage device 1000. In some embodiments, the liquid injection hole 16 may also be located between the first through hole 13 and the pressure relief hole 15 , and the liquid injection hole 16 is spaced apart from the first through hole 13 and the pressure relief hole 15 .

[0059] The end cap 10 also includes a plurality of receiving grooves 17. The plurality of receiving grooves 17 are all recessed in the lower surface 12 of the end cap 10 and are recessed in the direction of the upper surface 11 of the end cap 10. The plurality of receiving grooves 17 are close to the edge of the lower surface 12 of the end cap 10 and are spaced apart from the first through hole 13, the second through hole 14, the explosion-proof portion 24 and the liquid injection portion 25. The receiving grooves 17 are used to accommodate part of the lower plastic 20. In this embodiment, the number of receiving grooves 17 is four. Every two receiving grooves 17 are located at one end of the end cap 10 in the longitudinal direction. The four receiving grooves 17 are symmetrically arranged about the central axis in the longitudinal direction of the end cap 10, and the four receiving grooves 17 are symmetrically arranged about the central axis extending in the width direction of the end cap 10.

[0060] Please refer to Figure 3 、 Figure 5 and Figure 6 , Figure 5 for Figure 3 The schematic diagram of the structure of the lower plastic of the end cap assembly shown in another angle, Figure 6 for Figure 5 The lower plastic is shown in a partially enlarged view at E.

[0061] The lower plastic 20 includes a lower plastic body 21. The lower plastic body 21 includes a first surface 211 and a second surface 212. The first surface 211 and the second surface 212 are disposed in opposite directions along the thickness direction of the lower plastic body 21.

[0062] The lower plastic body 20 includes a first through-hole 22 and a second through-hole 23. Both the first through-hole 22 and the second through-hole 23 extend through the first and second surfaces 211 and 212 of the lower plastic body 21 in the thickness direction. The first through-hole 22 allows the first pole 40 to pass through. The second through-hole 23 allows the second pole 50 to pass through.

[0063] The lower plastic 20 also includes an explosion-proof portion 24. The explosion-proof portion 24 is located between the first pole through hole 22 and the second pole through hole 23, and is spaced apart from the first pole through hole 22 and the second pole through hole 23. The explosion-proof portion 24 is used to cooperate with the pressure relief hole 15 of the end cover 10 to release the gas inside the energy storage device 1000. The explosion-proof portion 24 is provided with an explosion-proof fence 241 on the first surface 211 of the lower plastic body 21, and an explosion-proof boss 242 on the second surface 212 of the lower plastic 20. It can be understood that the explosion-proof portion 24 includes the explosion-proof fence 241 and the explosion-proof boss 242. In this embodiment, the explosion-proof fence 241 can be regarded as an elliptical groove, and a plurality of through grooves are provided on the bottom wall of the groove for the gas inside the energy storage device to pass through. The explosion-proof boss 242 is roughly an elliptical boss.

[0064] The lower plastic 20 also includes a liquid injection portion 25. In this embodiment, the liquid injection portion 25 is located between the explosion-proof portion 24 and the second pole through-hole 23, and is spaced apart from the explosion-proof portion 24 and the second pole through-hole 23. In some embodiments, the liquid injection portion 25 can be located between the explosion-proof portion 24 and the first pole through-hole 22, and is spaced apart from the explosion-proof portion 24 and the first pole through-hole 22.

[0065] like Figure 3 and Figure 6 As shown, the liquid injection portion 25 includes a liquid injection hole 251. The liquid injection hole 251 passes through the first surface 211 and the second surface 212 of the lower plastic body 21. The liquid injection hole 251 is used to allow the electrolyte injected from the liquid injection hole 16 of the end cover 10 to pass through. Figure 5 As shown, the liquid injection portion 25 also includes a diverter 252. The diverter 252 includes an extension portion 253 and a blocking portion 254. The extension portion 253 is protruding from the second surface 212 of the lower plastic body 21 and is arranged around the edge of the liquid injection through-hole 251. At least one diverter hole 255 is provided on the extension portion 253, and the diverter hole 255 is connected to the liquid injection through-hole 251. The blocking portion 254 is connected to the side of the extension portion 253 away from the lower plastic body 21, and the blocking portion 254 can cover part of the liquid injection through-hole 251. In this embodiment, along the thickness direction of the lower plastic 20, the projection of the blocking portion 254 can cover part of the liquid injection through-hole 251, so as to achieve the effect of blocking and buffering the electrolyte injected into the liquid injection through-hole 251. Furthermore, the extension 253 includes two opposing diversion holes 255. The electrolyte injected into the injection hole 251 can flow out through the two diversion holes 255 of the extension 253, thereby achieving uniform diversion of the electrolyte. It will be appreciated that the diversion member 252 in this embodiment faces the injection hole 251, preventing the electrolyte entering the injection hole 251 from directly impacting the battery cell and instead flowing out through the side diversion holes 255, achieving uniform diversion of the electrolyte.

[0066] Please refer to Figure 7 、 Figure 8 and Figure 9 , Figure 7 for Figure 3 The cross-sectional view of the lower plastic of the end cap assembly along AA is shown. Figure 8 for Figure 7 The enlarged view of the lower plastic at F is shown. Figure 9 for Figure 7 The lower plastic is shown in a partially enlarged view at position G. Line AA is the central axis extending in the length direction of the lower plastic.

[0067] The lower plastic body 21 also includes a first recess 26 and a second recess 29. Both the first recess 26 and the second recess 29 are recessed from the first surface 211 toward the second surface 212. The first recess 26 forms a first protrusion 27 on the second surface 212, and the second recess 29 forms a second protrusion 30 on the second surface 212. The first recess 26 and the first protrusion 27 are located at one end of the length of the lower plastic body 21. The second recess 29 and the second protrusion 30 are located at the other end of the length of the lower plastic body 21. In this embodiment, the first recess 26 and the second recess 29 can be considered grooves. The first recess 26 includes a bottom wall and side walls connected to the bottom wall and arranged at an angle. The second recess 29 includes a bottom wall and side walls connected to the bottom wall and arranged at an angle. The first protrusion 27 and the second protrusion 30 can be considered bosses.

[0068] like Figure 7 and Figure 8 As shown, the first concave portion 26 includes a first concave surface 261. In this embodiment, the first concave surface 261 can be regarded as part of the first surface 211 of the lower plastic 20, and the first concave surface 261 constitutes part of the bottom wall of the first concave portion 26. The first concave surface 261 is a stepped surface.

[0069] The first concave surface 261 includes a first sub-concave surface 261a and a second sub-concave surface 261b. The first sub-concave surface 261a and the second sub-concave surface 261b are oriented in the same direction as the first surface 211. The first sub-concave surface 261a and the second sub-concave surface 261b are not on the same horizontal plane, and the first sub-concave surface 261a is recessed relative to the second sub-concave surface 261b.

[0070] like Figure 5 and Figure 8 As shown, the first convex portion 27 includes a first convex surface 271. The first convex surface 271 can be regarded as a portion of the second surface 212 of the lower plastic 20. In this embodiment, the first convex surface 271 is a step surface.

[0071] The first convex surface 271 includes a first sub-convex surface 271a and a second sub-convex surface 271b. The first sub-convex surface 271a and the second sub-convex surface 271b are oriented in the same direction as the second surface 212. The first sub-convex surface 271a and the second sub-convex surface 271b are not on the same horizontal plane, and the first sub-convex surface 271a is recessed relative to the second sub-convex surface 271b.

[0072] In this embodiment, the first concave surface 261 and the first convex surface 271 are disposed opposite each other along the thickness direction of the lower plastic 20. Specifically, along the length direction of the lower plastic 20, the first sub-concave surface 261a and the first sub-convex surface 271a are located near the end of the lower plastic body 21. Along the thickness direction of the lower plastic 20, the vertical distance from the first sub-concave surface 261a to the first surface 211 is greater than the vertical distance from the second sub-concave surface 261b to the first surface 211. The vertical distance from the first sub-convex surface 271a to the second surface 212 is greater than the vertical distance from the second sub-convex surface 271b to the second surface 212. The first sub-concave surface 261a and the first sub-convex surface 271a are disposed opposite each other along the thickness direction of the lower plastic 20. The second sub-concave surface 261b and the second sub-convex surface 271b are disposed opposite each other along the thickness direction of the lower plastic 20.

[0073] The first concave portion 26 further includes a first guide hole 28. The first guide hole 28 runs through the second sub-concave surface 261b and the second sub-convex surface 271b. The first guide hole 28 is used for electrolyte to pass through to ensure electrolyte reflux. The number of the first guide hole 28 can be one or more. In this embodiment, Figure 3 As shown, there are two first guide holes 28 , and the two first guide holes 28 are spaced apart along the width direction of the lower plastic 20 .

[0074] The sidewalls of the first recess 26 include a first sidewall 262, a third sidewall 263, and two first end walls. The first sidewall 262 and the third sidewall 263 are the two side walls of the first recess 26 in the width direction (i.e., along the length direction of the lower plastic 20). The first sidewall 262 and the third sidewall 263 both extend along the width direction of the lower plastic 20 and are spaced apart along the length direction of the lower plastic 20. The first sidewall 262 is closer to the central axis BB of the lower plastic 20 than the third sidewall 263. The two first end walls are connected to the first sidewall 262 and the third sidewall 263 and are spaced apart along the width direction of the lower plastic 20. In other words, the two first end walls are the two opposing side walls of the first recess 26 in the length direction (i.e., along the width direction of the lower plastic 20).

[0075] like Figure 7 and Figure 9 As shown, the second concave portion 29 includes a second concave surface 291. In this embodiment, the second concave surface 291 can be regarded as part of the first surface 211 of the lower plastic 20, and the second concave surface 291 constitutes part of the bottom wall of the second concave portion 29. The second concave surface 291 is a stepped surface.

[0076] The second concave surface 291 includes a third sub-concave surface 291a and a fourth sub-concave surface 291b. The third sub-concave surface 291a and the fourth sub-concave surface 291b are oriented in the same direction as the first surface 211. The third sub-concave surface 291a and the fourth sub-concave surface 291b are not on the same horizontal plane, and the third sub-concave surface 291a is recessed relative to the fourth sub-concave surface 291b.

[0077] like Figure 5 and Figure 9 As shown, the second convex portion 30 includes a second convex surface 311. The second convex surface 311 can be regarded as a portion of the second surface 212 of the lower plastic 20. In this embodiment, the second convex surface 311 is a stepped surface.

[0078] The second convex surface 311 includes a third sub-convex surface 311a and a fourth sub-convex surface 311b. The third sub-convex surface 311a and the fourth sub-convex surface 311b are oriented in the same direction as the second surface 212. The third sub-convex surface 311a and the fourth sub-convex surface 311b are not on the same horizontal plane, and the third sub-convex surface 311a is recessed relative to the fourth sub-convex surface 311b.

[0079] In this embodiment, the second concave surface 291 and the second convex surface 311 are disposed opposite each other along the thickness direction of the lower plastic body 20. Specifically, along the length direction of the lower plastic body 20, the third sub-concave surface 291a and the third sub-convex surface 311a are located near the other end of the lower plastic body 21. Along the thickness direction of the lower plastic body 20, the vertical distance from the third sub-concave surface 291a to the first surface 211 is greater than the vertical distance from the fourth sub-concave surface 291b to the first surface 211. The vertical distance from the third sub-convex surface 311a to the second surface 212 is greater than the vertical distance from the fourth sub-convex surface 311b to the second surface 212. The third sub-concave surface 291a and the third sub-convex surface 311a are disposed opposite each other along the thickness direction of the lower plastic body 20. The fourth sub-concave surface 291b and the fourth sub-convex surface 311b are disposed opposite each other along the thickness direction of the lower plastic body 20.

[0080] The second concave portion 29 further includes a second guide hole 32. The second guide hole 32 runs through the fourth sub-concave surface 291b and the fourth sub-convex surface 311b. The second guide hole 32 is used for electrolyte to pass through to ensure electrolyte reflux. The number of the second guide hole 32 can be one or more. In this embodiment, Figure 3 As shown, there are two second guide holes 32 , and the two second guide holes 32 are spaced apart along the width direction of the lower plastic 20 .

[0081] The sidewalls of the second recess 29 also include a second sidewall 292, a fourth sidewall 293, and two second end walls. The second sidewall 292 and the fourth sidewall 293 respectively form the two side walls of the second recess 29 in the width direction (i.e., along the length direction of the lower plastic 20). The second sidewall 292 and the fourth sidewall 293 both extend along the width direction of the lower plastic 20 and are spaced apart along the length direction of the lower plastic 20. The second sidewall 292 is closer to the central axis BB extending in the width direction of the lower plastic 20 than the fourth sidewall 293. The two second end walls are connected to the second sidewall 292 and the fourth sidewall 293 and are spaced apart along the width direction of the lower plastic 20. In other words, the two second end walls respectively form the two opposing side walls of the second recess 29 in the length direction (i.e., along the width direction of the lower plastic 20).

[0082] like Figure 7 and Figure 8 As shown, the lower plastic portion 20 further includes a first rib a and multiple first ribs c. Both the first rib a and the multiple first ribs c are projecting from the first concave surface 261 of the first recess 26. The first rib a and the multiple first ribs c are located between the first sidewall 262 and the third sidewall 263, and between the two first end walls. The first rib a is connected to the two first end walls. The multiple first ribs c are connected to the third sidewall 263. The first rib a extends along the width of the lower plastic portion 20. The multiple first ribs c extend along the length of the lower plastic portion 20 and are spaced apart along the width of the lower plastic portion 20. The multiple first ribs c and the first rib a intersect, and the first sidewall 262, the two first end walls, the multiple first ribs c, and the first rib a intersect to form two grooves 34 and a first receiving groove m. The two grooves 34 are located on either side of the width of the lower plastic portion 20. The first receiving groove m is located between the two grooves 34. The first accommodating groove m and the two grooves 34 are used to accommodate gas generated by the battery cell during operation, so as to increase the gas holding space of the energy storage device 1000 .

[0083] Each groove 34 includes a first groove 341 and a second groove 342. The first groove 341 and the second groove 342 are spaced apart along the length of the lower plastic 20, and the first groove 341 is further away from the middle of the lower plastic 20 than the second groove 342.

[0084] The first rib a includes a first sub-rib a1 and a second sub-rib a2. The first sub-rib a1 is convexly provided on the first sub-concave surface 261a of the first concave portion 26. The second sub-rib a2 is convexly provided on the second sub-concave surface 261b of the first concave portion 26. The first sub-rib a1 and the second sub-rib a2 are spaced apart along the length direction of the lower plastic 20, and the first sub-rib a1 and the second sub-rib a2 are both connected to the two first end walls. In this embodiment, the second sub-rib a2 is located at one end of the second sub-concave surface 261b close to the first sub-concave surface 261a. The height of the first sub-rib a1 is greater than the height of the second sub-rib a2. In some embodiments, the number of the first ribs a can be more than three, that is, not limited to the first sub-rib a1 and the second sub-rib a2. This application does not impose any restrictions on this.

[0085] In this embodiment, the plurality of first convex ribs c are each protruding from the first sub-concave surface 261a of the first recess 26. The plurality of first convex ribs c are each located between the third sidewall 263 and the second sub-rib a2 and connected to the third sidewall 263 and the second sub-rib a2. The plurality of first convex ribs c are intersecting with the first sub-rib a1. For example, there are four first convex ribs c.

[0086] In this embodiment, the first sub-rib a1, the third sidewall 263, a first end wall, and a first rib c adjacent to the first end wall collectively form a first groove 341. The second sub-rib a2, the first sub-rib a1, a first end wall, and a first rib c adjacent to the first end wall collectively form a second groove 342. The first accommodating groove m is divided into multiple grooves by the first sub-rib a1 and the multiple first ribs c, thereby forming different air-holding spaces.

[0087] The first side wall 262, the two first end walls, and the second sub-rib a2 collectively form a first reflow groove M. The first guide hole 28 is provided on the bottom wall of the first reflow groove M, and the first guide hole 28 is connected to the first reflow groove M. The first side wall 262, the two first end walls, and the second sub-rib a2 collectively constitute the side walls of the first reflow groove M.

[0088] like Figure 7 and Figure 9As shown, the lower plastic part 20 also includes a second rib b and multiple second ribs d. Both the second rib b and the multiple second ribs d are projecting from the second concave surface 291 of the second recess 29. The second rib b and the multiple second ribs d are located between the second sidewall 292 and the fourth sidewall 293, and between the two second end walls. The second rib b is connected to the two second end walls. The multiple second ribs d are connected to the fourth sidewall 293. The second rib b extends along the width of the lower plastic part 20. The multiple second ribs d extend along the length of the lower plastic part 20 and are spaced apart along the width of the lower plastic part 20. The multiple second ribs d and the second rib b intersect, and the multiple second ribs d, the second rib b, the second sidewall 292, and the two second end walls form two sub-slots 35 and a second receiving slot n. The two sub-slots 35 are located on either side of the width of the lower plastic part 20. The second receiving slot n is located between the two sub-slots 35. The second accommodating groove n and the two sub-grooves 35 are used to accommodate gas generated by the battery cell during operation, so as to increase the gas holding space of the energy storage device 1000 .

[0089] Each sub-slot 35 includes a first sub-slot 351 and a second sub-slot 352. The first sub-slot 351 and the second sub-slot 352 are spaced apart along the length of the lower plastic 20, and the first sub-slot 351 is further away from the middle of the lower plastic 20 than the second sub-slot 352.

[0090] The second rib b includes a third sub-rib b1 and a fourth sub-rib b2. The third sub-rib b1 is convexly provided on the third sub-concave surface 291a of the second concave portion 29. The fourth sub-rib b2 is convexly provided on the fourth sub-concave surface 291b of the second concave portion 29. The third sub-rib b1 and the fourth sub-rib b2 are spaced apart along the length direction of the lower plastic 20, and the third sub-rib b1 and the fourth sub-rib b2 are both connected to the two second end walls. In this embodiment, the fourth sub-rib b2 is located at one end of the fourth sub-concave surface 291b close to the third sub-concave surface 291a. The height of the third sub-rib b1 is greater than the height of the fourth sub-rib b2. In some embodiments, the number of the second ribs b can be more than three, that is, not limited to the third sub-rib b1 and the fourth sub-rib b2. This application does not impose any restrictions on this.

[0091] In this embodiment, the plurality of second ribs d are all protruding from the third sub-concave surface 291a of the second concave portion 29. The plurality of second ribs d are all located between and connected to the fourth sub-rib b2 and the fourth sidewall 293. The plurality of second ribs d are intersecting with the third sub-rib b1. By way of example, there are four second ribs d.

[0092] In this embodiment, the third sub-rib b1, the fourth sidewall 293, a second end wall, and a second rib d adjacent to the second end wall collectively form a first sub-slot 351. The fourth sub-rib b2, the third sub-rib b1, a second end wall, and a second rib d adjacent to the second end wall collectively form a second sub-slot 352. The second accommodating groove n is divided into multiple grooves by the third sub-rib b1 and the multiple second ribs d, thereby forming different air-holding spaces.

[0093] The second sidewall 292, the two second end walls, and the fourth sub-rib b2 collectively form a second reflow groove N. The second guide hole 32 is provided on the bottom wall of the second reflow groove N, and the second guide hole 32 is connected to the second reflow groove N. The second sidewall 292, the two second end walls, and the fourth sub-rib b2 collectively form the sidewalls of the second reflow groove N.

[0094] like Figure 7 and Figure 8 As shown, the lower plastic 20 also includes a plurality of first bosses 36. Each first boss 36 is protruding from the surface of the first sub-rib a1 in the thickness direction of the lower plastic 20. The first boss 36 is used to be accommodated in the receiving groove 17 of the end cover 10 to assemble and position the lower plastic 20 with the end cover 10. In this embodiment, each first boss 36 is located on the surface away from the first surface 211 at the intersection of the first sub-rib a1 and the first rib c. Exemplarily, the number of first bosses 36 is two, and each first boss 36 is arranged at the intersection of the first rib c and the first sub-rib a1 near the first end wall. The height of the first boss 36 is greater than the height of the first rib c and the height of the first sub-rib a1. In some embodiments, the number of first bosses 36 can be four, and the four first bosses 36 can be respectively arranged at the intersection of the four first ribs c and the first sub-rib a1.

[0095] like Figure 7 and Figure 9 As shown, the lower plastic 20 also includes a plurality of second bosses 37. Each second boss 37 is protruded from the surface of the third sub-rib b1 in the thickness direction of the lower plastic 20. The second bosses 37 are used to be accommodated in the receiving groove 17 of the end cover 10 to assemble and position the lower plastic 20 with the end cover 10. In this embodiment, each second boss 37 is protruded from the surface away from the first surface 211 at the intersection of the third sub-rib b1 and the second rib d. Exemplarily, the number of second bosses 37 is two, and each second boss 37 is arranged at the intersection of the second rib d and the third sub-rib b1 near the second end wall. The height of the second boss 37 is greater than the height of the second rib d and the height of the third sub-rib b1. In some embodiments, the number of second bosses 37 can be four, and the four second bosses 37 can be respectively arranged at the intersection of the four second ribs d and the third sub-rib b1.

[0096] In some embodiments, each first protrusion 36 can be located on a surface away from the first surface 211 at a location where the first sub-rib a1 does not intersect the first rib c. Each second protrusion 37 can be located on a surface away from the first surface 211 at a location where the third sub-rib b1 does not intersect the second rib d. In one embodiment, the first and second protrusions 36, 37 can be asymmetrical about the central axis BB extending along the width of the lower plastic housing 20 to provide a foolproof design.

[0097] Please refer to Figure 3 、 Figure 7 and Figure 10 , Figure 10 for Figure 3 A top view of the lower plastic of the end cap assembly is shown.

[0098] In this embodiment, in this embodiment, as Figure 7 As shown, the two grooves 34 and the two sub-grooves 35 are located at opposite ends of the lengthwise direction of the lower plastic 20, and are asymmetrically arranged about the central axis BB extending in the widthwise direction of the lower plastic 20. Specifically, the two first grooves 341 are located on either side of the widthwise direction of the lower plastic 20. The two second grooves 342 are located on either side of the widthwise direction of the lower plastic 20. The two first sub-grooves 351 are located on either side of the widthwise direction of the lower plastic 20. The two second sub-grooves 352 are located on either side of the widthwise direction of the lower plastic 20.

[0099] The first sub-groove 351 has a different area than the first groove 341, and the second sub-groove 352 has a different area than the second groove 342. In this embodiment, the first sub-groove 351 is closer to the liquid injection portion 25 than the first groove 341, and the area of ​​the first sub-groove 351 is larger than the area of ​​the first groove 341. The second sub-groove 352 is closer to the liquid injection portion 25 than the second groove 342, and the area of ​​the second sub-groove 352 is larger than the area of ​​the second groove 342. This allows the electrolyte and gas flowing out of the liquid injection portion 25 to quickly enter the first sub-groove 351 and the second sub-groove 352, preventing electrolyte or gas from overflowing.

[0100] In other embodiments, the groove area of ​​the first sub-groove 351 may be smaller than the groove area of ​​the first groove 341, and the groove area of ​​the second sub-groove 352 may be smaller than the groove area of ​​the second groove 342. In other embodiments, the groove area of ​​the first sub-groove 351 may be smaller than the groove area of ​​the first groove 341, and the groove area of ​​the second sub-groove 352 may be larger than the groove area of ​​the second groove 342. In other embodiments, the groove area of ​​the first sub-groove 351 may be larger than the groove area of ​​the first groove 341, and the groove area of ​​the second sub-groove 352 may be smaller than the groove area of ​​the second groove 342.

[0101] It can also be understood that, in this embodiment, the plurality of first protrusions 36 and the plurality of second protrusions 37 are asymmetrically arranged with respect to the central axis BB extending in the width direction of the lower plastic 20 .

[0102] Please refer to the Figure 3 、 Figure 4 and Figure 7 .

[0103] The lower plastic 20 and the end cap 10 are assembled. The lower plastic 20 and the end cap 10 are stacked along the thickness direction of the end cap assembly 100. The first surface 211 of the lower plastic 20 is opposite to and spaced from the lower surface 12 of the end cap 10. The first and second bosses 36, 37 of the lower plastic 20 extend into the receiving groove 17 of the end cap 10 to position and secure the lower plastic 20 and the end cap 10, achieving assembly and positioning of the lower plastic 20 and the end cap 10. The multiple first ribs c, multiple second ribs d, first ribs a, second ribs b, side walls and end walls of the first recess 26, and side walls and end walls of the second recess 29 of the lower plastic 20 all abut against the lower surface 12 of the end cap 10. The multiple first ribs c, multiple second ribs d, first ribs a, and second ribs b provided on the lower plastic 20 of this embodiment enhance the structural strength of the lower plastic 20.

[0104] In this embodiment, the lower plastic member 20 is further provided with a plurality of first protrusions 36 and a plurality of second protrusions 37. Specifically, the first protrusions 36 are provided at the intersection of the first rib c and the first sub-rib a1. This not only improves the structural strength of the lower plastic member 20 at the intersection of the first sub-rib a1 and the first rib c, but also provides support for the first protrusions 36 at the intersection of the first sub-rib a1 and the first rib c, thereby increasing the structural strength of the first protrusions 36.

[0105] The second protrusion 37 is positioned at the intersection of the second rib d and the third sub-rib b1. This not only improves the structural strength of the lower plastic 20 at the intersection of the second rib d and the third sub-rib b1, but also provides support for the second protrusion 37 at the intersection of the second rib d and the third sub-rib b1, thereby increasing the structural strength of the second protrusion 37. Furthermore, this improves the assembly strength between the lower plastic 20 and the end cap 10, preventing structural collapse of the lower plastic 20 during subsequent use and storage of the battery cell. It also improves the assembly efficiency of the lower plastic 20 and the end cap 10.

[0106] In this embodiment, the groove area of ​​the first sub-groove 351 is different from the groove area of ​​the first groove 341, and the groove area of ​​the second sub-groove 352 is different from the groove area of ​​the second groove 342. When the lower plastic 20 is assembled with the end cover 10, the left and right sides of the lower plastic 20 can be distinguished by directly visually inspecting the size of the first groove 341 and the first sub-groove 351 of the lower plastic 20 and the size of the second groove 342 and the second sub-groove 352. This plays a foolproof role, avoids the lower plastic 20 and the end cover 10 from being installed upside down, and improves assembly efficiency.

[0107] Furthermore, the asymmetrical arrangement of the plurality of first protrusions 36 and the plurality of second protrusions 37 about the central axis BB extending in the width direction of the lower plastic further prevents misalignment and prevents the lower plastic 20 from being installed upside down with the end cap 10. If the lower plastic 20 and the end cap 10 are installed upside down or misaligned, the first protrusions 36 and second protrusions 37 of the lower plastic 20 will not accurately fit into the corresponding receiving slots 17 of the end cap 10. Because the first protrusions 36 are located at the intersection of the first rib c and the first sub-rib a1, and the second protrusions 37 are located at the intersection of the second rib d and the third sub-rib b1, the positions of the first protrusions 36 and second protrusions 37 are protected from point-to-point deformation or even fracture caused by forced assembly. In other words, the probability of deformation and fracture at the first protrusions 36 and second protrusions 37 is reduced. Furthermore, if misalignment occurs after assembly between the end cap 10 and the lower plastic 20, the problem can be detected from the final assembly state, rather than from fracture caused by forced assembly after misalignment, which cannot be observed from the assembled state.

[0108] like Figure 2 and Figure 3 As shown, in this embodiment, the explosion-proof fence 241 of the lower plastic 20 is opposite to and connected to the pressure relief hole 15 of the end cover 10. The injection through hole 251 of the lower plastic 20 is coaxial with and connected to the injection hole 16 of the end cover 10. The first pole through hole 22 of the lower plastic 20 is coaxial with and connected to the first through hole 13 of the end cover 10. The first pole 40 is sequentially inserted into the first through hole 13 and the first pole through hole 22, and is used to be electrically connected to the battery cell. The second pole through hole 23 of the lower plastic 20 is coaxial with and connected to the second through hole 14 of the end cover 10. The second pole 50 is sequentially inserted into the second through hole 14 and the second pole through hole 23, and is used to be electrically connected to the battery cell.

[0109] like Figure 2 As shown, the battery cell and end cap assembly 100 are installed in the housing 200. The battery cell is located within the housing cavity of the housing 200, and the end cap assembly 100 is installed in the opening 201. The lower plastic 20 is located between the end cap 10 and the battery cell to separate and insulate the battery cell from the end cap 10. During use of the energy storage device 1000, gas is generated. The groove 34, the first accommodating groove m, the sub-groove 35, and the second accommodating groove n are all capable of accommodating gas to ensure the safety of the energy storage device 1000.

[0110] In the related art, the existing assembly and positioning method of the insulating member and the end cover of the end cover assembly has the problems of low assembly strength and low assembly efficiency.

[0111] In the embodiment of the present application, multiple ribs and ridges are provided on the thickness-wise surface of the lower plastic 20, enhancing the structural strength of the lower plastic 20. The ridges and ridges intersect, and the protrusions are located on the same side of the lower plastic 20 where the ribs and ridges are located. The protrusions are located on the ribs, reinforcing the structural strength of the protrusions. Furthermore, the protrusions can be located at the intersection of the ribs and ridges. The ridges and ridges work together to further strengthen the structural strength of the protrusions, increase the strength of the assembly between the lower plastic 20 and the end cap 10, and improve the assembly efficiency of the lower plastic 20 and the end cap 10. If misalignment occurs after assembly between the lower plastic 20 and the end cap 10, this can be detected from the final assembly state, rather than through forced assembly that causes the protrusions to break, which is undetectable from the assembled state. Furthermore, the asymmetrical arrangement of the multiple protrusions about the central axis BB extending along the width of the lower plastic 20 provides a foolproof assembly feature and improves the assembly precision of the lower plastic 20 and the end cap 10.

[0112] The above are only some of the embodiments and implementations of this application. The scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A lower plastic, characterized in that, The lower plastic includes a lower plastic body, the lower plastic body includes a first surface and a second surface, the first surface and the second surface are arranged in opposite directions along the thickness direction of the lower plastic body; The lower plastic further includes a first rib, a plurality of first convex ribs, a second rib, and a plurality of second convex ribs. In the length direction of the lower plastic body, the first rib and the plurality of first convex ribs are located at one end of the first surface, and the second rib and the plurality of second convex ribs are located at the other end of the first surface. The first ribs and the second ribs extend along the width direction of the lower plastic body, a plurality of the first convex ribs and a plurality of the second convex ribs are arranged at intervals along the width direction of the lower plastic body and extend along the length direction of the lower plastic body, a plurality of the first convex ribs are arranged to intersect with the first ribs, and a plurality of the second convex ribs are arranged to intersect with the second ribs; The lower plastic further includes a plurality of first protrusions and a plurality of second protrusions, each of the first protrusions being protruded from a surface of the first rib located in the thickness direction of the lower plastic body, and each of the second protrusions being protruded from a surface of the second rib located in the thickness direction of the lower plastic body, and the first protrusions and the second protrusions being asymmetric about a central axis extending in the width direction of the lower plastic body; wherein the first protrusions are provided at an intersection of the first rib and the first rib, and the first protrusions are located at an intersection of the first rib and the first rib, away from the first surface; Each of the second protrusions is arranged at the intersection of the second rib and the second rib, and each of the second protrusions is located away from the first surface at the intersection of the second rib and the second rib; the lower plastic also includes a first reflow groove and a second reflow groove, the first rib is adjacent to the first reflow groove, and the second rib is adjacent to the second reflow groove.

2. The lower plastic according to claim 1, characterized in that: The lower plastic further includes a first recess and a second recess located at both ends of the lower plastic body in the longitudinal direction, the first recess and the second recess are recessed in the first surface, the first rib and the plurality of first ribs are protruded from the first recess and extend away from the first surface, the first rib and the plurality of first ribs are connected to the sidewall of the first recess, the second rib and the plurality of second ribs are protruded from the second recess and extend away from the first surface, and the second rib and the plurality of second ribs are connected to the sidewall of the second recess; The sidewall of the first recess, the plurality of the first ribs and the first rib form two grooves and a first receiving groove, the two grooves are located on both sides of the width direction of the lower plastic body, and the first receiving groove is located between the two grooves; The sidewall of the second recess, the plurality of second convex ribs and the second ribs form two sub-grooves and a second accommodating groove; the two sub-grooves are located on both sides of the width direction of the lower plastic body, and the second accommodating groove is located between the two sub-grooves.

3. The lower plastic according to claim 2, characterized in that: The groove includes a first groove and a second groove, the first groove and the second groove are spaced apart along the length direction of the lower plastic body, and the first groove is farther away from the middle of the lower plastic body than the second groove; The sub-grooves include a first sub-groove and a second sub-groove, the first sub-groove and the second sub-groove being spaced apart along the length direction of the lower plastic body, and the first sub-groove being farther away from the middle portion of the lower plastic body than the second sub-groove; The groove area of ​​the first sub-groove is different from the groove area of ​​the first groove, and the groove area of ​​the second sub-groove is different from the groove area of ​​the second groove.

4. The lower plastic according to claim 3, characterized in that: The first rib includes a first sub-rib and a second sub-rib, the first sub-rib and the second sub-rib are spaced apart along the length direction of the lower plastic body, the first sub-rib and the second sub-rib are both connected to opposite side walls of the first recess along the width direction of the lower plastic body, and the first sub-rib is farther away from the middle of the lower plastic body than the second sub-rib; The first sub-rib, the sidewall of the first recess, and the first rib adjacent to the sidewall of the first recess along the width direction of the lower plastic body together form the first groove; the second sub-rib, the sidewall of the second recess, and the second rib adjacent to the sidewall of the second recess along the width direction of the lower plastic body together form the second groove; The second rib includes a third sub-rib and a fourth sub-rib, the third sub-rib and the fourth sub-rib are arranged at intervals along the length direction of the lower plastic body, the third sub-rib and the fourth sub-rib are both connected to opposite side walls of the second recess along the width direction of the lower plastic body, and the third sub-rib is farther away from the middle of the lower plastic body than the fourth sub-rib; The third sub-rib, the sidewall of the second recess, and the first convex rib adjacent to the sidewall of the second recess along the width direction of the lower plastic body together form the first sub-groove, and the fourth sub-rib, the sidewall of the second recess, and the second convex rib adjacent to the sidewall of the second recess along the width direction of the lower plastic body together form the second sub-groove.

5. The lower plastic according to claim 3, characterized in that: The groove area of ​​the first sub-groove is larger than the groove area of ​​the first groove, and the groove area of ​​the second sub-groove is larger than the groove area of ​​the second groove.

6. The lower plastic according to claim 4, characterized in that: The sidewall of the first recess further includes a first sidewall, the first sidewall extending along the width direction of the lower plastic body, and the first sidewall is located on a side of the second sub-rib facing away from the first sub-rib, and is spaced apart from the second sub-rib; The sidewall of the second recess further includes a second sidewall, the second sidewall extending along the width direction of the lower plastic body, and the second sidewall is located on a side of the fourth sub-rib facing away from the third sub-rib, and is spaced apart from the fourth sub-rib; The first side wall and the second sub-rib constitute part of the side wall of the first reflow groove, the bottom wall of the first reflow groove is provided with a first guide hole, the second side wall and the fourth sub-rib constitute part of the side wall of the second reflow groove, and the bottom wall of the second reflow groove is provided with a second guide hole.

7. An end cap assembly, characterized in that: The end cover assembly includes an end cover and a lower plastic according to any one of claims 1 to 6, a plurality of receiving grooves are recessed on a surface of the end cover in the thickness direction, the lower plastic and the end cover are stacked and connected along the thickness direction of the end cover assembly, and the plurality of first bosses and the plurality of second bosses of the lower plastic are respectively accommodated in the plurality of receiving grooves.

8. An energy storage device, characterized in that: The energy storage device includes a shell, a battery cell and the end cover assembly as described in claim 7, the battery cell is installed in the shell, and the end cover assembly is installed on one side of the battery cell in the height direction and sealed at the opening of the shell.

9. An electrical device, characterized in that: The electrical equipment includes the energy storage device according to claim 8, and the energy storage device is used to supply power to the electrical equipment.

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