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

Abstract

The embodiment of the present application provides a lower plastic, an end cover assembly, an energy storage device and an electrical equipment, the lower plastic includes a first lower plastic body and a second lower plastic body, the first lower plastic body includes a first surface, a second surface and a liquid injection part, the liquid injection part includes a liquid injection hole penetrating the first surface and the second surface, and a diverter protruding from the second surface, and the diverter cover is arranged on the liquid injection hole; the second lower plastic body includes a first surface and a second surface, and the first surface and the second surface are arranged in back to back along the thickness direction of the second lower plastic body; the second lower plastic body also includes an avoidance groove and an anti-idiot position, the avoidance groove and the anti-idiot position are formed with the first surface, and the anti-idiot position is located in the avoidance groove at a position symmetrical to the central axis extending along the width of the second lower plastic body; along the thickness direction of the lower plastic, the first lower plastic body and the second lower plastic body are stacked and connected, there is a gap between the first surface and the second surface, and the diverter part of the liquid injection part is located in the avoidance groove.

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 are increasingly demanding the structural requirements of secondary batteries. Typically, secondary batteries include end cap assemblies, which include insulating members that insulate the end caps from the battery cells. Existing end cap assemblies consist of a lower plastic and an end cap, often with a liquid injection hole assembly. However, if the liquid injection hole assembly interferes with the lower plastic during assembly, improper assembly can reduce assembly efficiency and even affect the liquid injection effect. 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 efficiency of the lower plastic of the end cover assembly and ensure the injection effect.

[0004] In a first aspect, a lower plastic is provided, the lower plastic comprising a first lower plastic body and a second lower plastic body, the first lower plastic body comprising a first surface, a second surface and a liquid injection portion, the first surface and the second surface being arranged in opposite directions along the thickness direction of the first lower plastic body; the liquid injection portion comprising a liquid injection through-hole penetrating the first surface and the second surface, the liquid injection portion further comprising a diverter, the diverter protruding from the second surface, the diverter covering the liquid injection through-hole; the second lower plastic body comprising a first surface and a second surface, the first surface and the second surface being arranged in opposite directions along the thickness direction of the second lower plastic body; the second lower plastic body further comprising an avoidance groove and an anti-fool position, the avoidance groove and the anti-fool position being located on the first surface, the anti-fool position being located in the avoidance groove at a position symmetrical to a central axis extending in the width direction of the second lower plastic body;

[0005] Along the thickness direction of the lower plastic, the first lower plastic body and the second lower plastic body are stacked and connected, the first surface faces the second surface, a gap is formed between the first surface and the second surface, and the diverter of the liquid injection part is correspondingly arranged with the avoidance groove.

[0006] In one embodiment, the avoidance groove is located on the side wall of the second lower plastic body in the width direction and is provided with a guide gap, and the guide gap passes through the side wall; the diverter member is provided with a diverter hole, and the diverter hole is connected to the liquid injection through hole, and the diverter hole is connected to the guide gap.

[0007] In one embodiment, the first lower plastic body further includes a pole through hole, and the pole through hole passes through the first surface and the second surface;

[0008] The second lower plastic body further includes a limiting structure located on the first surface, the limiting structure being located at an end portion in the length direction of the second lower plastic body; the limiting structure includes first retaining walls opposite to each other along the width direction of the second lower plastic body and second retaining walls opposite to each other along the length direction of the second lower plastic body; in the thickness direction of the lower plastic, the limiting structure is arranged opposite to the pole through hole.

[0009] In one embodiment, the second lower plastic body further includes a recessed portion, which is formed by the first surface being recessed toward the second surface. The second lower plastic body further includes a first sub-reinforcement rib, a second sub-reinforcement rib, a fourth sub-reinforcement rib, and a second sub-reinforcement rib protruding from the bottom surface of the recess. The fourth sub-reinforcement rib, the first sub-reinforcement rib, and the second sub-reinforcement rib are arranged spaced apart along the length direction of the second lower plastic body, and the avoidance groove is located between the first sub-reinforcement rib and the second sub-reinforcement rib; the second reinforcing rib extends along the length direction of the second lower plastic body, and the second reinforcing rib is arranged to intersect with the fourth sub-reinforcement rib, and the intersection position forms the anti-stuck position.

[0010] In one embodiment, the second lower plastic body further includes a third sub-reinforcement rib protruding from the bottom surface of the recess, the third sub-reinforcement rib being disposed adjacent to the avoidance groove or the anti-foolproof position, the third sub-reinforcement rib being disposed at intervals along the length direction of the second lower plastic body, and the second reinforcing rib passing through the third sub-reinforcement rib;

[0011] The limiting structure is located at the intersection of the third sub-reinforcement rib and the second reinforcing rib. The limiting structure is formed by the third sub-reinforcement rib and the second reinforcing rib being recessed along the thickness direction of the lower plastic away from the first lower plastic. The first holding wall is formed after the second reinforcing rib is recessed, and the second holding wall is formed after the third sub-reinforcement rib is recessed.

[0012] In one embodiment, the surface of the first holding wall and the surface of the second reinforcing rib connected to it in the thickness direction are connected to each other in an arc-shaped surface, and the surface of the second holding wall and the surface of the third sub-reinforcing rib connected to it in the thickness direction are connected to each other in an arc-shaped surface.

[0013] In one embodiment, the first lower plastic body also includes a first explosion-proof fence, which forms an explosion-proof boss on the second surface. A support platform is protruded around the first explosion-proof fence, and the support platform is protruded on the second surface and connected to the opposite sides of the explosion-proof boss; the first explosion-proof fence includes a plurality of first through grooves; the second lower plastic body also includes a second explosion-proof fence, and the second explosion-proof fence includes a plurality of second through grooves; in the thickness direction of the lower plastic, the first explosion-proof fence is opposite to the second explosion-proof fence, and the support platform abuts the first surface of the peripheral side of the second explosion-proof fence, and the first through groove and the second through groove are staggered.

[0014] In one embodiment, the second lower plastic body further includes a recessed portion, which is formed by the first surface being recessed toward the second surface. The second lower plastic body further includes a plurality of first reinforcing ribs and a second reinforcing rib protruding from the bottom surface of the recessed portion. The plurality of first reinforcing ribs are arranged at intervals along the length direction of the second lower plastic body, and the second reinforcing ribs extend along the length direction of the second lower plastic body. The second reinforcing ribs intersect with the plurality of first reinforcing ribs to form a plurality of groove-like structures.

[0015] The present application provides an end cap assembly, which includes an end cap and the lower plastic, the end cap is provided with an injection hole, the first lower plastic body is stacked on the surface of the end cap, the first surface faces the end cap, and the injection hole is opposite to and connected to the injection through hole of the injection part.

[0016] In one embodiment, the end cover assembly includes a first pole and a second pole, the first pole is provided with a first flange, the second pole is provided with a second flange, the first pole and the second pole both pass through the first lower plastic body and the end cover, the first flange and the second flange are protruded from the second surface, the first flange and the second flange, the second lower plastic body includes two limiting structures, in the thickness direction of the lower plastic, the first flange and the second flange are respectively opposite to the two limiting structures, and the two limiting structures are respectively clamped with the first flange and the second flange.

[0017] The present application provides an energy storage device, which includes a shell, a battery cell and the end cover assembly, the end cover assembly also including a pole, 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 to the opening of the shell; the side of the battery cell provided with a pole ear is opposite to the second surface of the second lower plastic body, and the pole ear is bent and extends into the gap to connect with the pole and conduct electricity.

[0018] The present application provides an electrical device, which includes an energy storage device, and the energy storage device is used to supply power to the electrical device.

[0019] In the related art, when the first lower plastic and the second lower plastic are assembled, the second lower plastic may be installed upside down in the length direction compared to the first lower plastic, affecting assembly efficiency. It may even go unnoticed after being installed upside down, and it will be assembled with the end cap, which may not only block the injection hole but also affect assembly accuracy. In the embodiment of the present application, an avoidance groove and an anti-fool position are provided on the second lower plastic body. When the second lower plastic body is assembled with the first lower plastic body, the avoidance groove can avoid the injection part of the first lower plastic body; the anti-fool position is located in the avoidance groove at a position symmetrical to the central axis extending along the width of the second lower plastic body. If the second lower plastic body is installed upside down, the anti-fool position will abut the diverter of the injection part, making it impossible for the second lower plastic body to be assembled with the first lower plastic body. A certain structural deformation will occur at the diverter position, ultimately achieving the anti-fool effect, further avoiding the second lower plastic body and the first lower plastic body from being installed incorrectly, which affects assembly efficiency and subsequent use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of an application scenario of the energy storage device provided in an embodiment of the present application;

[0021] Figure 2 for Figure 1 A schematic structural diagram of the energy storage device;

[0022] Figure 3 for Figure 2 Schematic diagram of the exploded structure of the energy storage device shown;

[0023] Figure 4 for Figure 2 A schematic plan view of a partial structure of the energy storage device shown;

[0024] Figure 5 for Figure 2 The schematic diagram of the exploded structure of the lower plastic and end cap of the end cap assembly shown;

[0025] Figure 6 for Figure 5 A schematic diagram of the structure of the lower plastic of the end cap assembly shown;

[0026] Figure 7 for Figure 6 An exploded structural diagram of the lower plastic portion of the end cap assembly is shown;

[0027] Figure 8 for Figure 7 The schematic diagram of the exploded structure of the lower plastic of the end cap assembly shown in FIG.

[0028] Figure 9 for Figure 6 The cross-sectional schematic diagram of the lower plastic along the II direction is shown.

[0029] The nouns corresponding to the reference numerals in the figure are: energy storage device 1000, battery cell 300, 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, injection hole 16, lower plastic 20, first lower plastic body 21, first surface 211, second surface 212, first protrusion 218, second protrusion 219, first pole through hole 22, second pole through hole 23, explosion-proof part 24, first explosion-proof fence 241, explosion-proof boss 242, groove bottom wall 2410, first through groove 243, injection part 25, injection through hole 251, diverter 252, extension 253, blocking part 254, diverter hole 255, first recess 216, second recess 217, first slot 2161, second slot 2171, second lower plastic body 26, recess 261, first Surface 2611, second surface 2612, convex portion 262, side surface 2620, second explosion-proof fence 244, second through groove 245, first reinforcing rib 264, second reinforcing rib 265, first sub-reinforcing rib 2641, second sub-reinforcing rib 2642, third sub-reinforcing rib 2643, fourth sub-reinforcing rib 2644, avoidance groove 266, side wall 2661, guide gap 2662, intersection A, limiting structure 267, first card Holding wall 2671, second holding wall 2672, first clip 268, second clip 269, first pole 40, second pole 50, explosion-proof valve 60, first adapter 70, second adapter 80, avoidance area 81, first flange 41, second flange 51, 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

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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 actual application form of the energy storage device 1000 provided in the embodiments of this application may be, but is not limited to, the products listed above, and may also have other application forms. For example, the energy storage device 1000 may be a secondary battery such as a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid (or lead-acid) battery, a lithium-ion battery, or a polymer lithium-ion battery. When the energy storage device 1000 is a single cell, it may be a cylindrical battery, a prismatic battery, or a battery of another shape. In this embodiment, the energy storage device 1000 is a prismatic battery. Prismatic batteries are secondary batteries.

[0038] See also Figure 2 、 Figure 3 and Figure 4 , Figure 2 for Figure 1 A schematic structural diagram of the energy storage device, Figure 3 for Figure 2 Schematic diagram of the exploded structure of the energy storage device shown; Figure 4 for Figure 2 A schematic plan view of a partial structure of the energy storage device shown.

[0039] 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.

[0040] 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.

[0041] The energy storage device 1000 includes a housing 200, an end cap assembly 100, and a battery cell 300. The housing 200 includes an opening 201 and is provided with a housing cavity. The opening 201 is connected to the housing cavity. The battery cell 300 is housed in the housing cavity. The end cap assembly 100 is mounted at one end of the battery cell in the height direction and is sealed at the opening 201 to isolate the internal environment of the energy storage device 1000 from the external environment. The battery cell 300 includes two sets of tabs (not shown), which are located on opposite sides of one end of the battery cell. The tabs are used to connect to the poles of the energy storage device 1000. The energy storage device 1000 also includes a first adapter plate 70 and a second adapter plate 80, which are used to connect the tabs and the poles.

[0042] Please refer to Figure 5 , Figure 5 for Figure 2 Schematic diagram of the exploded structure of the lower plastic and end cap of the end cap assembly shown.

[0043] 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 inserted 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).

[0044] The first pole 40 includes a first flange 41, and the second pole 50 includes a second flange 51. After the first pole 40 and the second pole 50 are mounted on the lower plastic, the first flange 41 and the second flange 51 are located on the side of the lower plastic facing away from the end cover.

[0045] 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.

[0046] 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.

[0047] 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 .

[0048] Please also refer to Figure 6 、 Figure 7 and Figure 8 , Figure 6 for Figure 5 A schematic diagram of the structure of the lower plastic of the end cap assembly shown; Figure 7 for Figure 6 An exploded structural diagram of the lower plastic portion of the end cap assembly is shown; Figure 8 for Figure 7 The schematic diagram of the exploded structure of the lower plastic of the end cover assembly from another angle is shown.

[0049] The lower plastic 20 includes a first lower plastic body 21 and a second lower plastic body 26. The first lower plastic body 21 and the second lower plastic body 26 are connected along the thickness direction of the lower plastic 20. In this embodiment, the length dimension of the first lower plastic body 21 is greater than the length dimension of the second lower plastic body 26. The width dimension of the first lower plastic body 21 is greater than the width dimension of the second lower plastic body 26 to facilitate the arrangement of the tabs. The length and width dimensions of the first lower plastic body 21 are comparable to the length and width dimensions of the end cap 10. It should be noted that the illustration is only for illustrating the position and mating relationship of the first lower plastic body 21 and the second lower plastic body 26, and does not show the tabs and adapter located between the first lower plastic body 21 and the second lower plastic body 26. The lower plastic 20 includes an explosion-proof portion 24, which is provided on the first lower plastic body 21 and the second lower plastic body 26.

[0050] The first 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 first lower plastic body 21 .

[0051] The first lower plastic body 21 includes a first pole through-hole 22 and a second pole through-hole 23. Both the first pole through-hole 22 and the second pole through-hole 23 extend through the first surface 211 and the second surface 212 of the first lower plastic body 21 in the thickness direction. The first pole through-hole 22 is for the first pole 40 to pass through. The second pole through-hole 23 is for the second pole 50 to pass through.

[0052] A first explosion-proof fence 241 is recessed on the first surface 211 of the first lower plastic body 21, and an explosion-proof boss 242 is projected on the second surface 212 of the lower plastic body 20. The first explosion-proof fence 241 is located between the first and second pole holes 22, 23, and is configured to engage with the pressure relief hole 15 of the end cap 10. A plurality of first through-slots 243 are provided on the bottom wall 2410 of the first explosion-proof fence 241. These first through-slots 243 extend through the bottom wall 2410 of the first explosion-proof fence 241 and the explosion-proof boss 242 along the thickness of the first lower plastic body 21. The shape of the plurality of first through-slots 243 is not limited and can be either arc-shaped or strip-shaped. In this embodiment, the plurality of first through-slots 243 are arranged along the periphery of the bottom wall 2410 of the first explosion-proof fence 241.

[0053] In this embodiment, the bottom wall 2410 of the first explosion-proof fence 241 is divided into three sections: a rectangular center section and arc-shaped side sections. The center section of the bottom wall 2410 is recessed relative to the side sections and corresponds to the explosion-proof projection 242. The first explosion-proof fence 241 is a generally elliptical groove. The explosion-proof projection 242 is a generally elliptical projection. It can be understood that the first explosion-proof fence 241 is a hollow structure.

[0054] like Figure 7 and Figure 8 As shown, the first lower plastic body 21 further 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.

[0055] 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 first 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 5As 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 first 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 first 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.

[0056] The first lower plastic body 21 also includes a first recess 216 and a second recess 217. Both the first recess 216 and the second recess 217 are recessed in the first surface 211. The first recess 216 is provided with a first protrusion 218 corresponding to the second surface 212. The second recess 217 is provided with a second protrusion 219 corresponding to the second surface 212. The first recess 216 and the second recess 217 are located at opposite ends of the length of the first lower plastic body 21. A first slot 2161 is provided on the bottom surface of the first recess 216, extending through the bottom surface of the first recess 216 and the surface of the first protrusion 218. A second slot 2171 is provided on the bottom surface of the second recess 217, extending through the bottom surface of the second recess 217 and the surface of the second protrusion 219.

[0057] Please read Figure 7 and Figure 8 The second lower plastic body 26 includes a first surface 2611 and a second surface 2612 , and the first surface and the second surface are disposed in opposite directions along the thickness direction of the second lower plastic body 26 .

[0058] The second lower plastic body 26 also includes a recessed portion 261, formed by the first surface 2611 being recessed toward the second surface 2612. A convex portion 262 is formed on the second surface. The bottom surface of the recessed portion 261 forms a portion of the first surface 2611. The recessed portion 261 extends along the length of the second lower plastic body 26. The convex portion 262 includes two opposing side surfaces 2620.

[0059] The second lower plastic body 26 also includes a second explosion-proof fence 244 and several second through-slots 245. The second explosion-proof fence 244 is located between the two ends of the second lower plastic body 26 and opposite the first explosion-proof fence 241. The central portion of the second explosion-proof fence 244, corresponding to the explosion-proof boss 242, is recessed toward the second surface 2612 to accommodate the explosion-proof boss 242. The bottom wall of the second explosion-proof fence 244 is provided with several second through-slots 245. These include a strip-shaped second through-slot corresponding to the explosion-proof boss 242 and circular hole-shaped second through-slots located on opposite sides of the strip-shaped second through-slot. The several second through-slots 245 extend through the first surface 2611 and the second surface 2612. It can be understood that the second explosion-proof fence 244 is a hollow structure.

[0060] The second lower plastic body 26 also includes a plurality of first reinforcing ribs 264 and second reinforcing ribs 265. These ribs 264 and 265 are protruding from the bottom surface of the recess 261. The first reinforcing ribs 264 are spaced apart along the length of the lower plastic body 20. The second reinforcing ribs 265 extend along the length of the lower plastic body 20 and intersect with the first reinforcing ribs 264. This means that the second reinforcing ribs 265 extend along the length of the lower plastic body 20, passing through the first reinforcing ribs 264 and intersecting each first reinforcing rib 264. The first and second reinforcing ribs 264, 265, and the second surface 2612 form a plurality of groove-like structures.

[0061] Specifically, the plurality of first reinforcing ribs 264 include a first sub-reinforcing rib 2641, a second sub-reinforcing rib 2642, two third sub-reinforcing ribs 2643, and several fourth sub-reinforcing ribs 2644. Along the length of the lower plastic 20, the two third sub-reinforcing ribs 2643 are located at either end of the recess 261. The recessed portion of the second explosion-proof fence 244 avoids the ribs, and the fourth sub-reinforcing ribs 2644 are located on both sides. This does not affect the explosion or deflation of the second explosion-proof fence 244, but rather increases the strength of the surrounding area of ​​the second explosion-proof fence 244. The first sub-reinforcing rib 2641 and the second sub-reinforcing rib 2642 are located between the fourth sub-reinforcing rib 2644 and the third sub-reinforcing rib 2643 on one side of the second explosion-proof fence 244. The second lower plastic body 26 of this embodiment is equipped with multiple first and second reinforcing ribs 264, 265, arranged in a crosswise pattern. This enhances the overall structural strength of the second lower plastic body 26 and prevents deformation along its length. Furthermore, the multiple first and second reinforcing ribs 264, 265 of the second lower plastic body 26 define multiple grooves on the second surface 2612. These grooves, when assembled with the housing 200 and the battery cells, store gases generated by chemical reactions within the housing. Furthermore, the multiple grooves are asymmetrically arranged along the widthwise central axis B of the second lower plastic body 26, further enhancing the anti-aliasing effect.

[0062] The second lower plastic body 26 also includes a relief groove 266, which is formed by the first sub-reinforcement rib 2641, the second sub-reinforcement rib 2642, and the two side walls of the lower plastic portion of the recess 261 in the width direction. The relief groove 266 is spaced apart from the second explosion-proof fence 244 and the third sub-reinforcement rib 2643. It can be understood that the second reinforcement rib 265 between the first sub-reinforcement rib 2641 and the second sub-reinforcement rib 2642 is removed or simply omitted during the manufacturing process. The relief groove 266 in this embodiment is a rectangular groove. The two side walls that enclose the relief groove 266 can be understood as the side walls 2661 of the relief groove 266. The side walls 2661 are provided with diversion gaps 2662. The diversion gaps 2662 extend through the side walls 2661 and the side surface 2620.

[0063] The fourth sub-reinforcement rib 2644 near the third sub-reinforcement rib 2643 and the second reinforcing rib 265 have an intersection A. The intersection A is about the central axis B extending along the width of the second lower plastic body 26 ( Figure 5 The symmetrical position (shown) is located in the avoidance groove 266. The cross position can be understood as an anti-stuck position. When there is only the second reinforcing rib 265, the anti-stuck position can be understood as part of the second reinforcing rib 265.

[0064] The second lower plastic body 26 also includes two limiting structures 267. The limiting structures 267 are located near the ends of the second lower plastic body 26. The limiting structures 267 are located at the intersection of the third sub-reinforcing rib 2643 and the second reinforcing rib 265, and are formed by recessing the third sub-reinforcing rib 2643 and the second reinforcing rib 265 toward the first surface 2611. This can be understood as the limiting structures 267 being formed by cutting a portion of the third sub-reinforcing rib 2643 and the second reinforcing rib 265 along the thickness direction of the second lower plastic body toward the first surface 2611. The area of ​​the limiting structures 267 corresponds to the flange of the pole, enabling them to be fixed to the flange. Specifically, the retaining structure 267 includes two first retaining walls 2671 and two second retaining walls 2672. The first retaining walls 2671 are formed by removing a portion (recessed) from the second reinforcing rib 265. The first retaining walls 2671 are spaced apart along the length of the second lower plastic body 26. The second retaining walls 2672 are formed by removing a portion (recessed) from the third sub-reinforcing rib 2643. The second retaining walls 2672 are spaced apart along the width of the second lower plastic body 26. It can be understood that the retaining structure is a groove, and the first retaining walls 2671 and the second retaining walls 2672 serve as the side walls surrounding the groove.

[0065] In this embodiment, the two retaining structures 267 are positioned opposite the first and second terminal through-holes 22 and 23. The surfaces of the two first retaining walls 2671 are curved where they connect to the second reinforcing rib 265 in the thickness direction. The surfaces of the two second retaining walls 2672 are curved where they connect to the third sub-reinforcing rib 2643 in the thickness direction.

[0066] During the transportation of the end cap assembly, the first lower plastic body 21, end cap 10, and two poles are assembled. The second lower plastic body 26 is assembled after the adapter is connected to the pole. However, it needs to be transported together with the end cap assembly. To facilitate transportation and packaging, and to prevent the second lower plastic body 26 from being lost, the first surface 2611 of the second lower plastic body 26 is oriented toward the second surface of the first lower plastic body 21. Two retaining structures 267 are respectively retained by the outer periphery of the first flange 41 of the first pole 40 and the outer periphery of the second flange 51 of the second pole 50. The two first retaining walls 2671 and the two second retaining walls 2672 are retained by the outer periphery of the corresponding flanges. It can be understood that by connecting the second lower plastic body 26 to the other assembled components, they can be packaged and transported together, ensuring the securement of the end cap structure and facilitating transportation. Furthermore, the surfaces of the two first retaining walls 2671 and the surfaces of the second reinforcing ribs 265 to which they are connected in the thickness direction are curved. The surfaces of the two second retaining walls 2672 and the third sub-reinforcement rib 2643, to which they connect in the thickness direction, are curved. This prevents scratching the flange. After the end cap is transported to the final assembly stage, the second lower plastic is separated from the first lower plastic before the subsequent assembly and welding process. Before the final assembly stage, the first and second lower plastics are connected to each other to achieve a removable installation and facilitate the securement of the end cap during transportation.

[0067] The second lower plastic body 26 further includes a first latch 268 and a second latch 269. The first latch 268 and the second latch 269 are both located at two ends of the lengthwise direction of the second lower plastic body 26. The lengthwise direction of the second lower plastic body 26 is used to latch with the first and second latch slots 2161 and 2171.

[0068] Please also refer to Figure 4 、 Figure 6 and Figure 9 , Figure 9 for Figure 6The schematic cross-sectional view of the lower plastic along direction II is shown. The lower plastic 20 and the end cap 10 are stacked along the thickness direction of the end cap assembly 100. The first lower plastic body 21 is mounted on the end cap 10, with the first surface 211 facing and connected to the lower surface 12 of the end cap 10. The first and second pole holes 22 and 23 are opposite and connected to the first and second holes 13 and 14, respectively. The pressure relief hole 15 is opposite the first explosion-proof fence 241 of the explosion-proof portion 24 and is connected to the first through-groove 243. The first pole 40 extends through and connects to the first and second pole holes 22, while the second pole 50 extends through and connects to the second and second pole holes 14 and 23. After the first and second poles 40 and 50 are mounted on the first lower plastic body 21, the first and second flanges 41 and 51 are located on the side of the first lower plastic body 21 facing away from the end cap 10, i.e., on the second surface 212.

[0069] The first adapter plate 70 is welded to the first flange 41 of the first terminal 40, and the second adapter plate 80 is welded to the second flange 51 of the second terminal 50. The second lower plastic body 26 is then mounted on the first lower plastic body 21, with the first surface 2611 facing the second surface 212. The area corresponding to the second explosion-proof fence 244 of the second lower plastic body 26 has a relatively low structural rigidity, allowing for a certain degree of flexibility when storing gas. The multiple second through-slots 245 of the second explosion-proof fence 244 are offset from the first through-slots of the first explosion-proof fence 241 of the first lower plastic body (with a common projected coverage of 20% to 30%). This prevents electrolyte from continuously flowing back during vibration and directly impacting the explosion-proof valve, potentially causing it to open abnormally.

[0070] The first and second reinforcing ribs 264 and 265 are spaced apart from the second surface. It is understood that a gap F exists between the first lower plastic body 21 and the second lower plastic body 26. The first and second protrusions 218 and 219 of the first lower plastic body 21 abut against the ends of the first surface 2611 of the second lower plastic body 26. The first latch 268 passes through the first slot 2161 and engages with its wall, while the second latch 269 passes through the second slot 2171 and engages with its wall, thereby securely connecting the second lower plastic body 26 to the first lower plastic body 21. In the thickness direction of the end cap assembly, the liquid injection portion 25 passes through the escape area 81 of the second adapter plate 80. The escape groove 266 faces the liquid injection portion 25. The blocking portion 254 of the liquid injection portion 25 can abut the bottom wall of the escape groove 266 or be spaced apart from it. The diverter hole 255 of the liquid injection portion 25 communicates with the diversion gap 2662 of the escape groove 266.

[0071] The end cap 10, which is equipped with the first lower plastic body 21, the second lower plastic body 26, the first pole 40, and the second pole 50, is installed in the housing 200 having the battery cell. The first tab and the second pole extend from both sides of the second lower plastic body 26 in the width direction into the gap between the first lower plastic body 21 and the second lower plastic body 26. The first tab is connected to the first adapter plate 70 to achieve an electrical connection between the first tab and the first pole, and the second tab is connected to the second adapter plate 80 to achieve an electrical connection between the second tab and the second pole. The connection between the first tab and the first adapter plate 70 and the connection between the second tab and the second adapter plate 80 can be connected by means such as conductive adhesive.

[0072] In this embodiment, a plurality of first and second reinforcing ribs 264 and 265 are provided on the second lower plastic body 26, and a relief groove is formed at a position corresponding to the liquid injection portion 25 of the first lower plastic body 21. When assembling the second lower plastic body 26 with the first lower plastic body 21, if the second lower plastic body 26 is installed upside down, that is, with the reinforcing ribs positioned corresponding to the liquid injection portion 25, the second lower plastic body 26 will not fit properly. In this embodiment, the fourth sub-reinforcement rib 2644 and the second reinforcement rib 265 have an intersection A. The intersection A is symmetrically located with respect to the central axis extending along the width of the second lower plastic body 26 and is located within the avoidance groove 266. If the second lower plastic body 26 is installed upside down, the intersection A will abut against the raised diverter of the liquid injection portion 25. The second lower plastic body 26 and the first lower plastic body 21 cannot be completely fitted together, resulting in improper assembly, thereby achieving a fool-proof effect and further avoiding the second lower plastic body 26 and the first lower plastic body 21 from being installed incorrectly, thereby affecting assembly efficiency and subsequent use.

[0073] Moreover, in the end cover assembly of this embodiment, the second lower plastic body 26 is provided with an avoidance groove 266, which is arranged opposite to the liquid injection part 25. The two side walls 2661 of the avoidance groove 266 are provided with a guide gap 2662 connected to the outside world. The guide gap 2662 can make the electrolyte in the liquid injection process more evenly distributed in the battery cell to avoid impacting the tab. At the same time, the avoidance groove 266 of the second lower plastic body 26 can block most of the electrolyte from flowing back upward during the exhaust process due to the barrier effect of the bottom wall of the groove, thereby improving the exhaust effect.

[0074] 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 comprises a first lower plastic body and a second lower plastic body, the first lower plastic body comprising a first surface, a second surface and a liquid injection portion, the first surface and the second surface being arranged in opposite directions along the thickness direction of the first lower plastic body; the liquid injection portion comprises a liquid injection through hole penetrating the first surface and the second surface, the liquid injection portion further comprising a diverter, the diverter protruding from the second surface, the diverter covering the liquid injection through hole; The second lower plastic body includes a first surface and a second surface, the first surface and the second surface being arranged in opposite directions along the thickness direction of the second lower plastic body; the second lower plastic body further includes an avoidance groove and an anti-foolproofing position, the avoidance groove and the anti-foolproofing position being located on the first surface, and the anti-foolproofing position being located within the avoidance groove at a position symmetrical with respect to a central axis extending along the width direction of the second lower plastic body; wherein the second lower plastic body further includes a second reinforcing rib and a fourth sub-reinforcing rib, the second reinforcing rib extending along the length direction of the second lower plastic body, the second reinforcing rib and the fourth sub-reinforcing rib being intersected, and the intersection forming the anti-foolproofing position; Along the thickness direction of the lower plastic, the first lower plastic body and the second lower plastic body are stacked and connected, the first surface faces the second surface, a gap is formed between the first surface and the second surface, and the diverter of the liquid injection part is correspondingly arranged with the avoidance groove.

2. The lower plastic according to claim 1, characterized in that: The avoidance groove is located on the side wall of the second lower plastic body in the width direction and is provided with a guide gap, and the guide gap passes through the side wall; the diverter member is provided with a diverter hole, and the diverter hole is connected to the liquid injection through hole, and the diverter hole is connected to the guide gap.

3. The lower plastic according to claim 1, characterized in that: The first lower plastic body further includes a pole through hole, and the pole through hole passes through the first surface and the second surface; The second lower plastic body further includes a limiting structure located on the first surface, the limiting structure being located at an end portion in the length direction of the second lower plastic body; the limiting structure includes first retaining walls opposite to each other along the width direction of the second lower plastic body and second retaining walls opposite to each other along the length direction of the second lower plastic body; in the thickness direction of the lower plastic, the limiting structure is arranged opposite to the pole through hole.

4. The lower plastic according to claim 3, characterized in that: The second lower plastic body further includes a recessed portion, which is formed by the first surface being recessed toward the second surface. The second lower plastic body further includes a first sub-reinforcement rib and a second sub-reinforcement rib protruding from the bottom surface of the recessed portion. The fourth sub-reinforcement rib, the first sub-reinforcement rib, and the second sub-reinforcement rib are spaced apart along the length direction of the second lower plastic body, and the avoidance groove is located between the first sub-reinforcement rib and the second sub-reinforcement rib.

5. The lower plastic according to claim 4, characterized in that: The second lower plastic body further includes a third sub-reinforcement rib protruding from the bottom surface of the recess, the third sub-reinforcement rib being arranged adjacent to the avoidance groove or the anti-foolproof position, the third sub-reinforcement rib being arranged at intervals along the length direction of the second lower plastic body, and the second reinforcing rib passing through the third sub-reinforcement rib; The limiting structure is located at the intersection of the third sub-reinforcement rib and the second reinforcing rib. The limiting structure is formed by the third sub-reinforcement rib and the second reinforcing rib being recessed along the thickness direction of the lower plastic away from the first lower plastic. The first holding wall is formed after the second reinforcing rib is recessed, and the second holding wall is formed after the third sub-reinforcement rib is recessed.

6. The lower plastic according to claim 5, characterized in that: The surface of the first holding wall and the surface of the second reinforcing rib connected to it in the thickness direction are connected in an arcuate surface, and the surface of the second holding wall and the surface of the third sub-reinforcing rib connected to it in the thickness direction are connected in an arcuate surface.

7. The lower plastic according to claim 1, characterized in that: The first lower plastic body also includes a first explosion-proof fence, which forms an explosion-proof boss on the second surface. A support platform is protruded around the first explosion-proof fence, and the support platform is protruded on the second surface and connected to the opposite sides of the explosion-proof boss; the first explosion-proof fence includes a plurality of first through grooves; the second lower plastic body also includes a second explosion-proof fence, and the second explosion-proof fence includes a plurality of second through grooves; in the thickness direction of the lower plastic, the first explosion-proof fence is opposite to the second explosion-proof fence, and the support platform abuts the first surface close to the peripheral side of the second explosion-proof fence, and the first through groove and the second through groove are staggered.

8. The lower plastic according to claim 1, characterized in that: The second lower plastic body further includes a recessed portion formed by the first surface being recessed toward the second surface. The second lower plastic body further includes a plurality of first reinforcing ribs and a second reinforcing rib protruding from the bottom surface of the recessed portion. The plurality of first reinforcing ribs are spaced apart along the length direction of the second lower plastic body. The second reinforcing ribs extend along the length direction of the second lower plastic body. The second reinforcing ribs intersect with the plurality of first reinforcing ribs to form a plurality of groove-like structures.

9. An end cap assembly, characterized in that: It comprises an end cover and the lower plastic according to any one of claims 1 to 8, wherein the end cover is provided with an injection hole, the first lower plastic body is stacked on the surface of the end cover, the first surface faces the end cover, and the injection hole is opposite to and connected to the injection through hole of the injection part.

10. The end cap assembly according to claim 9, wherein: The end cover assembly includes a first pole and a second pole, the first pole is provided with a first flange, the second pole is provided with a second flange, the first pole and the second pole both pass through the first lower plastic body and the end cover, the first flange and the second flange are protruded from the second surface, the second lower plastic body includes two limiting structures, in the thickness direction of the lower plastic, the first flange and the second flange are respectively opposite to the two limiting structures, and the two limiting structures are respectively clamped with the first flange and the second flange.

11. An energy storage device, characterized in that: The energy storage device includes a shell, a battery cell and an end cover assembly as described in claim 9 or 10, the end cover assembly also includes a pole, the battery cell is installed in the shell, the end cover assembly is installed on one side of the battery cell in the height direction and sealed to the opening of the shell; the side of the battery cell provided with a pole ear is opposite to the second surface of the second lower plastic body, and the pole ear is bent and extends into the gap to connect with the pole and conduct electricity.

12. An electrical device, characterized in that: The electrical equipment includes the energy storage device according to claim 11, and the energy storage device is used to supply power to the electrical equipment.

Images