End cap assembly, energy storage device and electrical equipment

Abstract

This application discloses an end cap assembly, an energy storage device, and an electrical device. The end cap assembly includes a top cap, a lower plastic component, a first electrode post, and a first pressure ring. The top cap includes a first protrusion and has a first mounting groove, while the lower plastic component has a first receiving groove. The lower plastic component and the top cap are stacked and connected. The first receiving groove is at least partially located within the first mounting groove. The first electrode post passes through the top cap and the lower plastic component. The first pressure ring is sleeved on the first electrode post and fixedly connected to it. The first pressure ring is at least partially located within the first receiving groove and fixedly connected to the groove wall of the first receiving groove. In a direction perpendicular to the thickness direction of the end cap assembly, the projection of the first pressure ring onto the lower plastic component overlaps the projection of the first protrusion onto the lower plastic component.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to an end cap assembly, an energy storage device, and an electrical appliance. Background Technology

[0002] A rechargeable battery, also known as a secondary battery or storage battery, is a battery that can be recharged after being discharged to reactivate its active materials and continue to be used. The recyclable nature of rechargeable batteries has made them a primary power source for electrical devices. As the demand for rechargeable batteries increases, higher requirements are being placed on their reliability.

[0003] In existing secondary batteries, after the terminals are embedded in the lower plastic via a pressure ring, the pressure ring will twist relative to the top cover under the action of the terminals, and will squeeze and cut the lower plastic. Summary of the Invention

[0004] This application provides an end cap assembly that prevents the lower plastic from being cut.

[0005] The end cap assembly includes a top cap, a lower plastic component, a first electrode post, and a first pressure ring. The top cap includes a top cap body and a first protrusion. Along the thickness direction of the top cap body, the top cap body has a front side and a back side opposite to the front side. The first protrusion protrudes from the back side. The top cap has a first mounting groove and a first through hole. The first mounting groove is recessed from the surface of the top cap body away from the first protrusion towards the top cap body. The first through hole penetrates the bottom wall of the first mounting groove and the front side. The lower plastic component includes a lower plastic body. Along the thickness direction of the lower plastic body, the lower plastic body includes a first surface and a second surface opposite to the first surface. The surface; the lower plastic has a first receiving groove, which is formed by the second surface being recessed towards the first surface; the lower plastic is located on the back side facing away from the front side and is stacked and connected with the top cover, the first receiving groove is at least partially located in the first mounting groove, and the first pole post is inserted through the first through hole; the first pressure ring is sleeved on the first pole post and fixedly connected to the first pole post, the first pressure ring is at least partially located in the first receiving groove and fixedly connected to the groove wall of the first receiving groove; in a direction perpendicular to the thickness direction of the end cover assembly, the projection of the first pressure ring on the lower plastic covers the projection of the first protrusion on the lower plastic.

[0006] In this embodiment, by providing a first protrusion on the top cover, which surrounds the first mounting groove, the height of the groove sidewall of the first mounting groove is increased, thereby increasing the area of ​​the groove sidewall of the first mounting groove. When the first pressure ring is accommodated in the first mounting groove, the overlapping area of ​​the top cover and the first pressure ring in the direction perpendicular to the thickness of the end cover assembly can be increased, thereby increasing the connection area between the first pressure ring and the top cover. The first pressure ring and the first pole are less likely to rotate relative to the top cover, which helps to improve the torsional strength of the first pole and prevents the portion of the lower plastic located between the first pressure ring and the top cover body from being cut.

[0007] In one possible implementation, the first protrusion has a first flat surface and a first inclined surface connected to each other. The first flat surface is connected to the sidewall of the first mounting groove, and the first inclined surface is connected to the back surface. From the front to the back surface, the first inclined surface is inclined toward the first through hole relative to the thickness direction of the top cover. In this way, material flow is facilitated during the stamping and punching process of the top cover to form the first protrusion. The first protrusion can be obtained by stamping the top cover in one step, thus eliminating the need for machining, reducing the processing steps of the top cover, thereby improving the production efficiency of the top cover and reducing costs.

[0008] In one possible implementation, the height H1 of the first protrusion in the thickness direction of the top cover is in the range of 0.05-0.3mm. This allows the first protrusion to be formed in a single stamping process, eliminating the need for machining, thereby improving production efficiency, reducing costs, and avoiding burrs caused by machining.

[0009] In one possible implementation, the top cover further includes a first reinforcing part, which protrudes from the bottom wall of the first mounting groove and surrounds the first through hole and connects to the side wall of the first mounting groove.

[0010] In this embodiment, during the pressing process of the top cover, the reduced thickness of the top cover at the first mounting groove results in a larger shearing force on the top cover at the first mounting groove. Therefore, this embodiment increases the thickness of the top cover at the first mounting groove by providing a first reinforcing part, thereby increasing the structural strength of the top cover and helping to ensure that the top cover is not easily deformed during the pressing process. Furthermore, in the length direction of the top cover, providing the first reinforcing part reduces the distance from the sidewall of the first mounting groove to the wall of the first through hole, shortening the lever arm and enabling the top cover to withstand greater external forces at the first mounting groove, thus improving the structural strength of the top cover.

[0011] In one possible implementation, the height H2 of the first reinforcing part in the thickness direction of the top cover is in the range of 0.1 to 0.5 mm. This results in a more reasonable structural design for the top cover and higher strength.

[0012] In one possible implementation, the first reinforcing part has a third plane and a first stepped surface that are interconnected. The third plane is located on the side of the first reinforcing part facing away from the bottom wall of the first mounting groove and is connected to the side wall of the first mounting groove. The first stepped surface is connected to the bottom wall of the first mounting groove. A chamfer R is formed at the connection between the first stepped surface and the third plane. 11 The connection between the first step surface and the bottom wall of the first mounting groove forms a chamfer R. 21This facilitates material flow during the pressing process of the top cover, and the first sub-mounting groove can be formed by a single stamping process without machining, reducing the processing steps of the top cover, which helps to improve production efficiency and reduce costs.

[0013] In one possible implementation, the chamfer R 11 radius and chamfer R 21 The radii are all in the range of 0.05-3mm.

[0014] In one possible implementation, the top cover further includes a first boss protruding from the front side, and a first through hole extending through the first boss; the first boss has a first circumferential side surface, which is inclined toward the first through hole from the back side toward the front side, relative to the thickness direction of the top cover.

[0015] In this embodiment, by setting a first protrusion at the edge of the first through hole, the height of the hole wall of the first through hole is increased, thereby increasing the connection area between the first pole post and the top cover. This helps to prevent the first pole post from twisting relative to the top cover, thereby reducing the cutting of the lower plastic.

[0016] In one possible implementation, the angle between the first side surface and the thickness direction of the top cover is in the range of 5° to 60°. This facilitates material flow into the first through-hole during the upsetting process of forming the first boss on the top cover, thereby reducing wear on the stamping die, improving die life and product yield, and reducing the generation of metal wires.

[0017] In one possible implementation, the first pole post is at least partially a polygonal pole, and the shape of the first through hole matches the shape of the first pole post. Compared to a scheme where the first pole post is cylindrical, this application sets at least part of the first pole post as a polygonal pole and sets the shape of the first through hole to correspond to the shape of the first pole post. This makes it less likely for the first pole post to rotate relative to the top cover when it is connected to the top cover, improving the torsional strength of the first pole post and helping to prevent the portion of the lower plastic between the first pressure ring and the top cover body from being cut.

[0018] In one possible implementation, the first pole post includes a first part and a second part, the second part being connected to one side surface of the first part, the first part being inserted through a first through hole, the first part being a hexagonal pole, and the second part being engaged with a first pressure ring. Specifically, the first part is used to insert through the first through hole and engage with the top cover to obtain higher torsional strength, and the second part is used to engage with the first pressure ring.

[0019] In one possible implementation, the first part includes a first top surface facing and connected to the second part. The first part also includes a first surface, a second surface, a third surface, a fourth surface, a fifth surface, and a sixth surface connected sequentially, with the first to sixth surfaces all connected to the first top surface. The first to sixth surfaces are centrally symmetrically distributed with respect to the central axis of the first pole post. A chamfer R is formed at the connection between the first surface and the second surface. 01 Chamfer R 01 The radius is in the range of 0.5mm to 5.0mm. In this way, the wear on the mold can be reduced in the first electrode process, while the material flow is facilitated and the process yield of the first electrode is improved; in addition, the material flow resistance during the stamping process of the first electrode can be reduced, and the surface layer of the first part is less likely to crack.

[0020] In one possible implementation, a chamfer R is formed at the junction of the first top surface and the first surface. 02 Chamfer R 02 The radius is in the range of 0.1mm to 1mm. This reduces the manufacturing difficulty of the first electrode and facilitates material flow during the manufacturing process.

[0021] In one possible implementation, the first surface is inclined toward the center of the first electrode post along the direction from the first part to the second part. In this way, wear on the mold can be reduced during the manufacturing process of the first electrode post, while material flow is facilitated, thus improving the process yield of the first electrode post; in addition, the material flow resistance during the stamping process of the first electrode post can be reduced, and the surface layer of the first part is less prone to cracking.

[0022] In one possible implementation, the angle between the first surface and the thickness direction of the top cover is in the range of 0.05° to 5°.

[0023] In one possible implementation, the lower plastic also includes a first relief groove, which is formed by a recess from the first surface toward the second surface, and the first relief groove is correspondingly disposed to the first protrusion.

[0024] In this embodiment, the first clearance groove is used to avoid the first protrusion of the top cover.

[0025] In one possible implementation, the first receiving groove forms a first retaining protrusion on the first surface, and the lower plastic also includes a first protrusion, which protrudes from the side surface of the first retaining protrusion facing away from the first surface; the first mounting groove includes a first sub-mounting groove and a second sub-mounting groove arranged and connected along the thickness direction of the top cover, the first retaining protrusion is inserted into the first sub-mounting groove, and the first protrusion is inserted into the second sub-mounting groove.

[0026] In this embodiment, the first retaining protrusion A and the first sub-mounting groove can be mutually engaged to achieve mutual positioning, and the first protrusion and the second sub-mounting groove can be mutually engaged to achieve mutual positioning. By improving the torsional strength of the first pole post, this application helps to prevent the first protrusion, the first retaining protrusion A, and part of the lower plastic body located between the top cover body and the first pressure ring from being cut.

[0027] This application also provides an energy storage device, which includes a housing and an end cap assembly as described above, the end cap assembly being mounted on the housing and sealing the opening of the housing.

[0028] This application also provides an electrical appliance, which includes the above-mentioned energy storage device, and the energy storage device is used to store electrical energy. Attached Figure Description

[0029] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 Application scenario diagram of the energy storage device provided in the embodiments of this application;

[0031] Figure 2 for Figure 1 The diagram shows a three-dimensional structure of the energy storage device.

[0032] Figure 3 for Figure 2 The diagram shows the structure of the end cap assembly.

[0033] Figure 4 for Figure 3 The diagram shows a partial structural exploded view of the end cap assembly.

[0034] Figure 5 for Figure 3 A partially exploded view of the end cap assembly from another angle;

[0035] Figure 6 for Figure 5 The image shows a partial enlarged view of the end cap assembly at point M.

[0036] Figure 7 for Figure 4 The end cap assembly shown is a partial enlarged view at point N;

[0037] Figure 8A for Figure 4 The diagram shows the structure of the first pole and the first flange.

[0038] Figure 8B for Figure 8A A schematic diagram of the partial structure of the first pole post and the first flange after being cut at an angle;

[0039] Figure 9A for Figure 4 The diagram shows the structure of the second pole and the second flange.

[0040] Figure 9B for Figure 9A The diagram shows a partial structural layout of the second pole and the second flange after being cut at an angle.

[0041] Figure 10 for Figure 2 The diagram shows a partial structural view of the end cap assembly after being cut open at one angle.

[0042] Figure 11 for Figure 10 The diagram shows a partial enlarged view of the end cap assembly at point P.

[0043] The main reference numerals in the figure correspond to the following terms: 2000 Power conversion device, 3000 Wind power conversion device, 4000 Power grid, 1000 Energy storage device, 400 Housing, 100 End cover assembly, 10 Top cover, 11 Top cover body, 111 Front, 112 Back, 12 First through hole, 121 First mounting slot, 1211 First sub-mounting slot, 1212 Second sub-mounting slot, 122 First reinforcing part, 1221 Third plane, 1222 First stepped surface, 123 First protrusion, 1231 First plane, 1232 First inclined surface, 124 First boss. 1241 First boss top surface, 1242 First peripheral side surface, 13 Second through hole, 131 Second mounting groove, 1311 Third sub-mounting groove, 1312 Fourth sub-mounting groove, 132 Second reinforcing part, 1321 Fourth plane, 1322 Second stepped surface, 133 Second protrusion, 1331 Second plane, 1332 Second inclined surface, 134 Second boss, 1341 Second boss top surface, 1342 Second peripheral side surface, 14 Explosion-proof valve, 15 Injection hole, 16 Explosion-proof valve protective plate, 20 Lower plastic, 21 Lower plastic body, 211 First surface, 212 Second surface, 2 2 First pole post through hole, 221 First receiving groove, 221A First holding protrusion, 222 First protrusion, 223 First clearance groove, 23 Second pole post through hole, 231 Second receiving groove, 231A Second holding protrusion, 232 Second protrusion, 233 Second clearance groove, 30 First pole post, 301 First part, 3011 First top surface, 3012 First surface, 3013 Second surface, 3014 Third surface, 3015 Fourth surface, 3016 Fifth surface, 3017 Sixth surface, 302 Second part, 31 First flange, 40 Second pole post, 401 Third part The components are: 4011 Second top surface, 4012 Seventh surface, 4013 Eighth surface, 4014 Ninth surface, 4015 Tenth surface, 4016 Eleventh surface, 4017 Twelfth surface, 402 Fourth part, 41 Second flange, 51 First pressure ring, 52 Second pressure ring, 61 First upper plastic, 611 First main body, 612 First inner ring, 613 First outer ring, 614 First limiting groove, 62 Second upper plastic, 621 Second main body, 622 Second inner ring, 623 Second outer ring, 624 Second limiting groove, 71 First seal, 72 Second seal. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0045] Please see Figure 1 , Figure 1 This diagram illustrates an application scenario of the energy storage device 1000 provided in this application embodiment. The energy storage device 1000 provided in this application embodiment is applied to an energy storage system, which includes a power conversion device 2000 (photovoltaic panel), a wind power conversion device 3000 (wind turbine), a power grid 4000, and the energy storage device 1000. The energy storage device 1000 can serve as an energy storage cabinet and can be installed outdoors. Specifically, the power conversion device 2000 (photovoltaic panel) can convert solar energy into electrical energy during periods of low electricity prices. The energy storage device 1000 stores this electrical energy and supplies it to the power grid 4000 during peak electricity demand periods, or provides power when the power grid 4000 experiences a power outage. The wind power conversion device 3000 (wind turbine) can convert wind energy into electrical energy. The energy storage device 1000 stores this electrical energy and supplies it to the power grid 4000 during peak electricity demand periods, or provides power when the power grid 4000 experiences a power outage. The electrical energy can be transmitted using high-voltage cables.

[0046] 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 this application embodiment may be, but is not limited to, the listed products, and may also be other application forms. This application embodiment does not strictly limit the application form of the energy storage device 1000. The number of energy storage devices 1000 can be multiple, and multiple energy storage devices 1000 can be connected in series or parallel. Multiple energy storage devices 1000 are supported and electrically connected by an isolation plate (not shown). In this embodiment, "multiple" refers to two or more.

[0047] This application embodiment only uses the energy storage device 1000 as an example of a single battery cell. A single battery cell may include one or more bare cells.

[0048] Please see Figure 2 , Figure 2 for Figure 1 The diagram shows a three-dimensional structure of the energy storage device 1000.

[0049] In some embodiments, the energy storage device 1000 includes a housing 400, an end cap assembly 100, and an electrode assembly (not shown). The housing 400 has an opening and a receiving cavity communicating with the opening of the housing 400. The electrode assembly is received in the receiving cavity. The end cap assembly 100 is mounted on the housing 400 and seals the opening of the housing 400. The end cap assembly 100 is mounted on one end of the electrode assembly and electrically connected to the electrode assembly. For ease of description, definitions are provided. Figure 2The length direction of the end cap assembly 100 shown is the X-axis direction, the width direction is the Y-axis direction, and the thickness direction is the Z-axis direction. The X-axis, Y-axis, and Z-axis directions are mutually perpendicular. The directional terms such as "upper" and "lower" mentioned in the description of the embodiments in this application are based on the appendix to the specification. Figure 2 The orientation described herein, with "up" referring to the positive Z-axis direction and "down" referring to the negative Z-axis direction, does not constitute a limitation on the energy storage device 1000 in actual application scenarios. The terms "same" and "perpendicular" used below are subject to certain tolerances.

[0050] Please refer to the following: Figure 3 , Figure 4 and Figure 5 , Figure 3 for Figure 2 The diagram shows the structure of the end cap assembly 100. Figure 4 for Figure 3 The diagram shown is a partial exploded view of the end cap assembly 100. Figure 5 for Figure 3 An exploded view of the end cap assembly 100 from another angle.

[0051] In this embodiment, the end cap assembly 100 includes a top cover 10, a lower plastic part 20, a first electrode post 30, a second electrode post 40, a first pressure ring 51, and a second pressure ring 52. In this embodiment, the top cover 10 is made of aluminum, and the lower plastic part 20 is made of plastic and is insulating. The lower plastic part 20 is installed on one side of the top cover 10. The first electrode post 30 and the second electrode post 40 are used for electrical connection with the electrode assembly. For example, one end of the first electrode post 30 is connected to a first flange 31. One end of the second electrode post 40 is connected to a second flange 41. It should be noted that the first electrode post 30 can be a positive electrode post, the second electrode post 40 can be a negative electrode post, the first flange 31 can be a positive flange, and the second flange 41 can be a negative flange; or, the first electrode post 30 can be a negative electrode post, the second electrode post 40 can be a positive electrode post, the first flange 31 can be a negative flange, and the second flange 41 can be a positive flange.

[0052] For example, the top cover 10 includes a top cover body 11, an explosion-proof valve 14, and a liquid injection hole 15. The top cover body 11 is an elongated thin plate, and along the thickness direction of the top cover body 11 (i.e., the Z-axis direction), it includes a front side 111 and a back side 112 disposed opposite to the front side 111. The top cover 10 has a first through hole 12 and a second through hole 13. Both the first through hole 12 and the second through hole 13 penetrate the front side 111 and the back side 112 of the top cover body 11. The first through hole 12 and the second through hole 13 are respectively disposed at opposite ends of the top cover body 11 (arranged along the X-axis direction) for the first pole post 30 and the second pole post 40 to pass through.

[0053] For example, both the first through hole 12 and the second through hole 13 are hexagonal, designed to match the shapes of the first pole post 30 and the second pole post 40. This prevents the first pole post 30 and the second pole post 40 from rotating relative to the top cover 10 when connected, thus improving their torsional strength. In this embodiment, the first through hole 12 and the second through hole 13 can correspond to changes in the shape of the first pole post 30. The first through hole 12 and the second through hole 13 can be polygonal, circular, or irregularly shaped, other than hexagonal, and this application does not limit their shapes.

[0054] For example, along the length of the top cover 10, i.e., the X-axis direction, the second through hole 13, the liquid injection hole 15, the explosion-proof valve 14, and the first through hole 12 are arranged sequentially at intervals. The explosion-proof valve 14 is located in the middle of the top cover body 11. When the internal pressure of the energy storage device 1000 is too high, the explosion-proof valve 14 will automatically open to release pressure to prevent an explosion. The liquid injection hole 15 is located between the second through hole 13 and the explosion-proof valve 14. During the liquid injection process of the power battery, electrolyte is injected into the battery through the liquid injection hole 15 on the top cover 10.

[0055] In some embodiments, the top cover 10 may further include an explosion-proof valve protection plate 16, which is disposed opposite to the explosion-proof valve 14 and covers the explosion-proof valve 14.

[0056] Please refer to the following: Figure 4 , Figure 5 and Figure 6 , Figure 6 for Figure 5 A partial enlarged view of the end cap assembly 100 at point M.

[0057] In this embodiment, the top cover 10 further includes a first protrusion 123 and a second protrusion 133, both of which protrude from the back surface 112. The first protrusion 123 and the second protrusion 133 are located at opposite ends of the top cover body 11 (arranged along the X-axis direction). The top cover 10 also has a first mounting groove 121 and a second mounting groove 131. The first mounting groove 121 is recessed into the top cover body 11 from the surface of the first protrusion 123 facing away from the top cover body 11. A first through hole 12 penetrates the bottom wall and the front surface 111 of the first mounting groove 121. The second mounting groove 131 is recessed into the top cover body 11 from the surface of the second protrusion 133 facing away from the top cover body 11. A second through hole 13 penetrates the bottom wall and the front surface 111 of the second mounting groove 131. The first mounting groove 121 and the second mounting groove 131 are symmetrically distributed relative to the centerline of the top cover body 11 in the length direction. The first mounting groove 121 and the second mounting groove 131 are used for mating and connecting with the lower plastic 20.

[0058] For example, the first protrusion 123 is annular and surrounds the first through hole 12. The first protrusion 123 has a first plane 1231 and a first inclined surface 1232 connected to each other. The first plane 1231 is connected to the sidewall of the first mounting groove 121, and the first inclined surface 1232 is connected to the back surface 112 of the top cover body 11. The first plane 1231 may be perpendicular to the thickness direction of the top cover 10. From the front surface 111 to the back surface 112, the first inclined surface 1232 is inclined toward the first through hole 12 relative to the thickness direction (i.e., the Z-axis direction) of the top cover 10.

[0059] In this embodiment, the first protrusion 123 can be formed by stamping. By providing a first inclined surface 1232 on the first protrusion 123, material flow is facilitated during the stamping and cutting of the top cover 10 to form the first protrusion 123. The first protrusion 123 can be obtained by stamping the top cover 10 in one step, thus eliminating the need for machining, reducing the processing steps of the top cover 10, thereby improving the production efficiency of the top cover 10 and reducing costs.

[0060] In this embodiment, the height H1 of the first protrusion 123 in the thickness direction of the top cover 10 is in the range of 0.05-0.3mm, that is, the distance between the first plane 1231 and the back surface 112 is in the range of 0.05-0.3mm, for example, 0.05mm, 0.1mm, 0.3mm, etc. In this way, the first protrusion 123 can be formed by stamping in one step without machining, which helps to improve the production efficiency of the top cover 10, reduce costs, and avoid workpiece burrs caused by machining.

[0061] For example, the second protrusion 133 is annular and surrounds the second through hole 13. The second protrusion 133 has a second plane 1331 and a second inclined surface 1332 that are interconnected. The second plane 1331 is also connected to the sidewall of the second mounting groove 131, and the second inclined surface 1332 is also connected to the back surface 112 of the top cover body 11. From the front surface 111 to the back surface 112, the second inclined surface 1332 is inclined toward the second through hole 13 relative to the thickness direction (i.e., the Z-axis direction) of the top cover 10.

[0062] In this embodiment, the second protrusion 133 can be formed by stamping. By providing a second inclined surface 1332 on the second protrusion 133, material flow is facilitated during the stamping and cutting of the top cover 10 to form the second protrusion 133. The second protrusion 133 can be obtained by stamping the top cover 10 in one step, thus eliminating the need for machining, reducing the processing steps of the top cover 10, thereby improving the production efficiency of the top cover 10 and reducing costs.

[0063] In this embodiment, the height of the second protrusion 133 in the thickness direction of the top cover 10 is in the range of 0.05-0.3mm, that is, the distance between the second plane 1331 and the back surface 112 is in the range of 0.05-0.3mm, for example, 0.05mm, 0.1mm, 0.3mm, etc. In this way, the second protrusion 133 can be formed by stamping in one step without machining, which helps to improve the production efficiency of the top cover 10, reduce costs, and avoid workpiece burrs caused by machining.

[0064] In this embodiment, the top cover 10 further includes a first reinforcing part 122 and a second reinforcing part 132. The first reinforcing part 122 protrudes from the bottom wall of the first mounting groove 121, and surrounds the first through hole 12 and connects to the side wall of the first mounting groove 121. That is, the first reinforcing part 122 is annular and surrounds the first through hole 12. In this embodiment, the first mounting groove 121 can be formed by stamping. By providing the first reinforcing part 122, the thickness of the top cover 10 at the first mounting groove 121 is increased, thereby increasing the structural strength of the top cover 10 and making it less prone to deformation during the pressing process.

[0065] For example, the first mounting groove 121 includes a first sub-mounting groove 1211 and a second sub-mounting groove 1212 arranged and connected along the thickness direction of the top cover 10. The second sub-mounting groove 1212 is formed by recessing the bottom wall of the first sub-mounting groove 1211 towards the front side 111. A first through hole 12 penetrates the bottom wall of both the first sub-mounting groove 1211 and the second sub-mounting groove 1212.

[0066] For example, the first reinforcing part 122 has a third plane 1221 and a first stepped surface 1222 that are interconnected. The third plane 1221 is located on the side of the first reinforcing part 122 facing away from the bottom wall of the first mounting groove 121 and is connected to the side wall of the first mounting groove 121. The first stepped surface 1222 is connected to the bottom wall of the first mounting groove 121. Specifically, the third plane 1221 is the bottom wall of the first sub-mounting groove 1211, and the first stepped surface 1222 is the side wall of the second sub-mounting groove 1212. The first stepped surface 1222 connects the bottom wall of the first sub-mounting groove 1211 and the bottom wall of the second sub-mounting groove 1212.

[0067] For example, in the thickness direction of the top cover 10, the height H2 of the first reinforcing part 122 is in the range of 0.1 to 0.5 mm, that is, in the Z-axis direction, the distance between the bottom wall of the first sub-mounting groove 1211 and the bottom wall of the second sub-mounting groove 1212 is in the range of 0.1 to 0.5 mm. For example, H2 can be in the range of 0.2 to 0.3 mm. In this way, the structural design of the top cover 10 is more reasonable, and the strength of the top cover 10 is higher.

[0068] For example, the first stepped surface 1222 is an inclined surface. From the back surface 112 towards the front surface 111, the first stepped surface 1222 is inclined towards the first through hole 12 relative to the thickness direction of the top cover 10. The connection between the first stepped surface 1222 and the third plane 1221 is rounded to form a chamfer R. 11 The connection between the first step surface 1222 and the bottom wall of the first mounting groove 121 is rounded to form a chamfer R. 21 That is, the first stepped surface 1222 and the bottom wall of the first sub-mounting groove 1211 also have a smooth transition, as do the first stepped surface 1222 and the bottom wall of the second sub-mounting groove 1212. This facilitates material flow during the pressing process of the top cover 10, and the first and second sub-mounting grooves 1211 and 1212 can be formed in a single stamping process without machining, reducing the processing steps of the top cover 10, thus improving production efficiency and reducing costs. For example, the chamfer R... 11 radius and chamfer R 21 The radius is in the range of 0.05-3mm.

[0069] In this embodiment, the second reinforcing part 132 protrudes from the bottom wall of the second mounting groove 131, and surrounds the second through hole 13 and connects to the side wall of the second mounting groove 131. That is, the second reinforcing part 132 is annular and surrounds the second through hole 13. In this embodiment, the second mounting groove 131 can be formed by stamping. By providing the second reinforcing part 132, the thickness of the top cover 10 at the second mounting groove 131 is increased, thereby increasing the structural strength of the top cover 10 and making it less prone to deformation during the pressing process.

[0070] For example, the second mounting groove 131 includes a third sub-mounting groove 1311 and a fourth sub-mounting groove 1312 arranged and connected along the thickness direction of the top cover 10. The fourth sub-mounting groove 1312 is formed by recessing the bottom wall of the third sub-mounting groove 1311 towards the front side 111. The second through hole 13 penetrates the bottom walls of both the third sub-mounting groove 1311 and the fourth sub-mounting groove 1312.

[0071] For example, the second reinforcing part 132 has a fourth plane 1321 and a second stepped surface 1322 that are interconnected. The fourth plane 1321 is located on the side of the second reinforcing part 132 facing away from the bottom wall of the second mounting groove 131 and is connected to the side wall of the second mounting groove 131. The second stepped surface 1322 is connected to the bottom wall of the second mounting groove 131. The fourth plane 1321 is the bottom wall of the third sub-mounting groove 1311. The second stepped surface 1322 is the side wall of the fourth sub-mounting groove 1312. The second stepped surface 1322 connects the bottom walls of the third sub-mounting groove 1311 and the fourth sub-mounting groove 1312.

[0072] For example, in the thickness direction of the top cover 10, the height of the second reinforcing part 132 is in the range of 0.1 to 0.5 mm, that is, in the Z-axis direction, the distance between the bottom wall of the third sub-mounting groove 1311 and the bottom wall of the fourth sub-mounting groove 1312 is in the range of 0.1 to 0.5 mm. For example, it can be in the range of 0.2 to 0.3 mm. In this way, the structural design of the top cover 10 is more reasonable, and the strength of the top cover 10 is higher.

[0073] For example, the second step surface 1322 is an inclined surface. From the back surface 112 towards the front surface 111, the second step surface 1322 is inclined towards the second through hole 13 relative to the thickness direction of the top cover 10. The connection between the second step surface 1322 and the fourth plane 1321 is rounded to form a chamfer R. 12 The connection between the second step surface 1322 and the bottom wall of the second mounting groove 131 is rounded to form a chamfer R. 22 That is, the second step surface 1322 and the bottom wall of the third sub-mounting groove 1311 also have a smooth transition, as do the second step surface 1322 and the bottom wall of the fourth sub-mounting groove 1312. This facilitates material flow during the pressing process of the top cover 10, and the third and fourth sub-mounting grooves 1311 and 1312 can be formed in a single stamping process without machining, reducing the processing steps of the top cover 10, thus improving production efficiency and reducing costs. For example, the chamfer R... 12 radius and chamfer R 22 The radius is in the range of 0.05-3mm.

[0074] Please refer to the following: Figure 4 , Figure 5 and Figure 7 , Figure 7 for Figure 4 A partial enlarged view of the end cap assembly 100 at point N.

[0075] In this embodiment, the top cover 10 further includes a first boss 124 and a second boss 134, which are located at opposite ends of the top cover body 11 (arranged along the X-axis) and are respectively used to mate and connect with the first upper plastic and the second upper plastic. Both the first boss 124 and the second boss 134 protrude from the front surface 111 of the top cover body 11. A first through hole 12 penetrates the first boss 124. A second through hole 13 penetrates the second boss 134.

[0076] For example, the first boss 124 is annular, with its inner periphery being hexagonal for connection with the first pole post 30. The outer periphery of the first boss 124 is approximately circular. The first boss 124 has a top surface 1241 facing away from the front surface 111 and a first peripheral side surface 1242 connected to the top surface 1241. The first peripheral side surface 1242 is also connected to the front surface 111 of the top cover body 11. The first peripheral side surface 1242 is inclined, extending from the back surface 112 towards the front surface 111, and is inclined towards the first through hole 12 relative to the thickness direction (i.e., the Z-axis direction) of the top cover 10. In this way, during the process of forming the first boss 124 on the top cover 10 by upsetting, it is easier for material to flow into the first through hole 12, thereby reducing wear on the stamping die caused by the top cover 10, improving die life and product yield, and reducing the generation of metal wires.

[0077] For example, the angle between the first side surface 1242 and the Z-axis direction is in the range of 5° to 60°. The angle between the first side surface 1242 and the Z-axis direction can be in the range of 10° to 30°, for example, 10°, 20°, 30°, etc.

[0078] For example, the second boss 134 is annular, with its inner periphery being hexagonal for connection with the second pole post 40. The outer periphery of the second boss 134 is approximately circular. The second boss 134 has a top surface 1341 facing away from the front surface 111 and a second peripheral side surface 1342 connected to the top surface 1341. The second peripheral side surface 1342 is also connected to the front surface 111 of the top cover body 11. The second peripheral side surface 1342 is inclined, extending from the back surface 112 towards the front surface 111, and is inclined towards the second through hole 13 relative to the thickness direction (i.e., the Z-axis direction) of the top cover 10. In this way, during the process of forming the second boss 134 on the top cover 10 by upsetting, it is easier for material to flow into the second through hole 13, thereby reducing wear on the stamping die caused by the top cover 10, improving die life and product yield, and reducing the generation of metal wires.

[0079] For example, the angle between the second side 1342 and the Z-axis direction is in the range of 5° to 60°. The angle between the second side 1342 and the Z-axis direction can be in the range of 10° to 30°, for example, 10°, 20°, 30°, etc.

[0080] Please refer to it again. Figure 4 and Figure 5 In this embodiment, the lower plastic 20 includes a lower plastic body 21, which is generally a rectangular thin plate. Along the thickness direction (Z-axis direction) of the lower plastic body 21, it includes a first surface 211 and a second surface 212 disposed opposite to the first surface 211.

[0081] For example, the lower plastic 20 has a first electrode through hole 22, a first receiving groove 221, a second electrode through hole 23, and a second receiving groove 231. The first receiving groove 221 is formed by recessing from the second surface 212 toward the first surface 211, and a first retaining protrusion 221A is formed on the first surface 211. The first electrode through hole 22 penetrates the bottom wall of the first receiving groove 221 and the first surface 211, that is, it penetrates the first retaining protrusion 221A.

[0082] For example, the first receiving groove 221 and the first pole post through hole 22 are coaxially arranged and located near one end of the lower plastic body 21. The first pole post through hole 22 is used for the first pole post 30 to pass through. The first pole post through hole 22 is a hexagonal through hole for mating and connecting with the first pole post 30. The first receiving groove 221 is used to receive the first pressure ring 51.

[0083] For example, the second receiving groove 231 is formed by the second surface 212 being recessed towards the first surface 211, and a second retaining protrusion 231A is formed on the first surface 211. The second pole through hole 23 penetrates the first surface 211 and the second surface 212, and the second pole through hole 23 penetrates the bottom wall of the second receiving groove 231, that is, it penetrates the second retaining protrusion 231A.

[0084] For example, the second receiving groove 231 and the second pole post through hole 23 are coaxially arranged and located near the other end of the lower plastic body 21. The second pole post through hole 23 is for the second pole post 40 to pass through. The second pole post through hole 23 is a hexagonal through hole for mating and connecting with the second pole post 40. The second receiving groove 231 is used to receive the second pressure ring 52.

[0085] In this embodiment, the lower plastic 20 further includes a first protrusion 222 and a second protrusion 232. The first protrusion 222 protrudes from the side surface of the first retaining protrusion 221A facing away from the first surface 211. The first protrusion 222 and the first retaining protrusion 221A are coaxially arranged, and the first pole post through hole 22 penetrates the first protrusion 222. The first retaining protrusion 221A and the first protrusion 222 are respectively used to engage with the first sub-mounting groove 1211 and the second sub-mounting groove 1212. The second protrusion 232 protrudes from the side surface of the second retaining protrusion 231A facing away from the first surface 211. The second protrusion 232 and the second retaining protrusion 231A are coaxially arranged, and the second pole post through hole 23 penetrates the second protrusion 232. The second retaining protrusion 231A and the second protrusion 232 are respectively used to engage with the third sub-mounting groove 1311 and the fourth sub-mounting groove 1312.

[0086] In this embodiment, the lower plastic 20 further includes a first clearance groove 223 and a second clearance groove 233. Both the first clearance groove 223 and the second clearance groove 233 are formed by recesses from the first surface 211 towards the second surface 212. The first clearance groove 223 is disposed around the first retaining protrusion 221A. The first clearance groove 223 is configured to correspond to and avoid the first protrusion 123 of the top cover 10. The second clearance groove 233 is disposed around the second retaining protrusion 231A. The second clearance groove 233 is configured to correspond to and avoid the second protrusion 133 of the top cover 10.

[0087] Please refer to the following: Figure 5 , Figure 8A and Figure 8B , Figure 8A for Figure 4 The schematic diagram of the first pole post 30 and the first flange 31 shown is as follows. Figure 8B for Figure 8A The diagram shows a partial structural view of the first pole post 30 and the first flange 31 after being cut at an angle.

[0088] In this embodiment, the first pole post 30 is at least partially a hexagonal prism. It is understood that the first pole post 30 may be partially or entirely hexagonal prisms. For example, the first pole post 30 includes a first portion 301 and a second portion 302. Figure 8BThe first part 301, the second part 302, and the first flange 31 are schematically distinguished by dashed lines. The second part 302 is connected to one side surface of the first part 301, and the first part 301 and the second part 302 are coaxially arranged. The first part 301 is a regular hexagonal prism, and the second part 302 is a cylinder. In the height direction of the first pole post 30 (i.e., the Z-axis direction), the projected area of ​​the second part 302 is smaller than the projected area of ​​the first part 301. The first part 301 is used to pass through the first through hole 12 and connect with the top cover 10 to obtain higher torsional strength, and the second part 302 is used to connect with the first pressure ring 51. The second part 302 is also used for electrical connection with the electrode assembly of the energy storage device 1000.

[0089] In this embodiment, the first flange 31 is a cylinder. The first flange 31 is located on the side of the first part 301 facing away from the second part 302 and is connected to the first part 301. The first part 301 may be located in the middle of the first flange 31. The first pole post 30 and the first flange 31 are integrally formed structural components, and the first pole post 30 and the first flange 31 may be formed by stamping. Exemplarily, the first part 301 of the first pole post 30 includes a first top surface 3011 facing the second part 302 and connected to the second part 302. The first part 301 also includes a first surface 3012, a second surface 3013, a third surface 3014, a fourth surface 3015, a fifth surface 3016, and a sixth surface 3017 connected in sequence. The first surface 3012 to the sixth surface 3017 are all connected to the first top surface 3011. The first surface 3012 to the sixth surface 3017 are centrally symmetrically distributed with respect to the central axis O1-O1 of the first pole post 30.

[0090] In this embodiment, each pair of adjacent surfaces from the first surface 3012 to the sixth surface 3017 is rounded, meaning there is a smooth transition between each pair of adjacent surfaces. This reduces wear on the mold during the manufacturing process of the first electrode post 30, facilitates material flow, and improves the yield of the first electrode post 30. Furthermore, it reduces material flow resistance during the stamping process of the first electrode post 30, making the surface layer of the first portion 301 less prone to cracking. For example, the connection between the first surface 3012 and the second surface 3013 is rounded, forming a chamfer R. 01 That is, there is a smooth transition between the first surface 3012 and the second surface 3013. Chamfer R 01 The radius ranges from 0.5mm to 5.0mm. For example, the chamfer radius (R) is... 01 The radius can be in the range of 1.5mm to 2.5mm.

[0091] For example, the connection points between the second surface 3013 and the third surface 3014, the third surface 3014 and the fourth surface 3015, the fourth surface 3015 and the fifth surface 3016, the fifth surface 3016 and the sixth surface 3017, and the sixth surface 3017 and the first surface 3012 are all rounded. For details, please refer to the chamfer between the first surface 3012 and the second surface 3013, which will not be repeated here.

[0092] In this embodiment, the connections between the first top surface 3011 and the first surface 3012, second surface 3013, third surface 3014, fourth surface 3015, fifth surface 3016, and sixth surface 3017 are all rounded, meaning there is a smooth transition between the first top surface 3011 and the first surface 3012, second surface 3013, third surface 3014, fourth surface 3015, fifth surface 3016, and sixth surface 3017. This reduces the manufacturing difficulty of the first electrode post 30 and facilitates material flow during the manufacturing process. For example, a chamfer R is formed at the connection between the first top surface 3011 and the first surface 3012. 02 Chamfer R 02 The radius is in the range of 0.1 mm to 1 mm. For example, the chamfer R. 02 The radius is in the range of 0.25mm to 0.5mm.

[0093] For example, the connection between the first top surface 3011 and the second surface 3013, the connection between the first top surface 3011 and the third surface 3014, the connection between the first top surface 3011 and the fourth surface 3015, the connection between the first top surface 3011 and the fifth surface 3016, and the connection between the first top surface 3011 and the sixth surface 3017 are all chamfered, and the radius of the chamfer is the same as the radius of the chamfer between the first top surface 3011 and the first surface 3012.

[0094] In this embodiment, along the direction from the first flange 31 to the first pole post 30 (i.e., along the direction from the first portion 301 to the second portion 302), each of the first surfaces 3012 to the sixth surface 3017 is inclined towards the center of the first pole post 30; that is, each of the first surfaces 3012 to the sixth surface 3017 is set at an angle to the Z-axis. At this time, the area of ​​the first top surface 3011 of the first portion 301 is smaller than the area of ​​the surface of the first portion 301 facing away from the second portion 302. This reduces wear on the mold during the manufacturing process of the first pole post 30, facilitates material flow, and improves the yield of the first pole post 30. Furthermore, it reduces material flow resistance during the stamping process of the first pole post 30, making the first portion 301 less prone to surface cracking. For example, the angle between the first surfaces 3012 to the sixth surface 3017 and the Z-axis is in the range of 0.05° to 5°. For instance, the angle between the first surfaces 3012 to the sixth surface 3017 and the Z-axis is in the range of 1° to 3°.

[0095] Please refer to the following: Figure 5 , Figure 9A and Figure 9B , Figure 9A for Figure 4 The diagram shows the structure of the second pole post 40 and the second flange 41. Figure 9B for Figure 9A The diagram shows a partial structural view of the second pole post 40 and the second flange 41 after being cut at an angle. In some embodiments, the second pole post 40 is at least partially a hexagonal column. It is understood that the second pole post 40 may be partially a hexagonal column, or the second pole post 40 may be entirely a hexagonal column. Exemplarily, the second pole post 40 includes a third portion 401 and a fourth portion 402. Figure 9B The third part 401, the fourth part 402, and the second flange 41 are schematically distinguished by dashed lines. The fourth part 402 is connected to one side surface of the third part 401, and the third part 401 and the fourth part 402 are coaxially arranged. The third part 401 is a regular hexagonal prism, and the fourth part 402 is a cylinder. In the height direction of the second pole post 40 (i.e., the Z-axis direction), the projected area of ​​the fourth part 402 is smaller than the projected area of ​​the third part 401. The third part 401 is used to pass through the second through hole 13 and connect with the top cover 10 to obtain higher torsional strength, while the fourth part 402 is used to connect with the second pressure ring 52. The second part 302 is also used for electrical connection with the electrode assembly of the energy storage device 1000.

[0096] In this embodiment, the second flange 41 is a cylinder. The second flange 41 is located on the side of the third part 401 facing away from the fourth part 402 and is connected to the third part 401. The third part 401 may be located in the middle of the second flange 41. The second pole post 40 and the second flange 41 are integrally formed structural components, and the second pole post 40 and the second flange 41 may be formed by stamping. Exemplarily, the third part 401 of the second pole post 40 includes a second top surface 4011 that faces and connects to the fourth part 402. The third part 401 also includes a seventh surface 4012, an eighth surface 4013, a ninth surface 4014, a tenth surface 4015, an eleventh surface 4016, and a twelfth surface 4017 connected in sequence. The seventh surface 4012 to the twelfth surface 4017 are all connected to the second top surface 4011. The seventh surface 4012 to the twelfth surface 4017 are centrally symmetrically distributed with respect to the central axis O2-O2 of the second pole post 40.

[0097] In this embodiment, each pair of adjacent surfaces from the seventh surface 4012 to the twelfth surface 4017 is rounded, meaning there is a smooth transition between each pair of adjacent surfaces. This reduces wear on the mold during the manufacturing process of the second pole post 40, facilitates material flow, and improves the yield rate of the second pole post 40. Furthermore, it reduces material flow resistance during the stamping process of the second pole post 40, making the surface layer of the third part 401 less prone to cracking. For example, the connection between the seventh surface 4012 and the eighth surface 4013 is rounded, forming a chamfer R. 03 That is, there is a smooth transition between the seventh surface 4012 and the eighth surface 4013. Chamfer R 03 The radius ranges from 0.5mm to 5.0mm. For example, the chamfer radius (R) is... 03 The radius can be in the range of 1.5mm to 2.5mm.

[0098] For example, the connections between the eighth face 4013 and the ninth face 4014, the ninth face 4014 and the tenth face 4015, the tenth face 4015 and the eleventh face 4016, the eleventh face 4016 and the twelfth face 4017, and the twelfth face 4017 and the seventh face 4012 are all rounded. For details, please refer to the chamfer between the seventh face 4012 and the eighth face 4013, which will not be repeated here.

[0099] In this embodiment, the connections between the second top surface 4011 and the seventh surface 4012, eighth surface 4013, ninth surface 4014, tenth surface 4015, eleventh surface 4016, and twelfth surface 4017 are all rounded, meaning there is a smooth transition between the second top surface 4011 and the seventh surface 4012, eighth surface 4013, ninth surface 4014, tenth surface 4015, eleventh surface 4016, and twelfth surface 4017. This reduces the manufacturing difficulty of the second pole post 40 and facilitates material flow during the manufacturing process. For example, a chamfer R is formed at the connection between the second top surface 4011 and the seventh surface 4012. 04 Chamfer R 04 The radius is in the range of 0.1 mm to 1 mm. For example, the chamfer R. 04 The radius is in the range of 0.25mm to 0.5mm.

[0100] For example, the connection points of the second top surface 4011 and the eighth surface 4013, the connection points of the second top surface 4011 and the ninth surface 4014, the connection points of the second top surface 4011 and the tenth surface 4015, the connection points of the second top surface 4011 and the eleventh surface 4016, and the connection points of the second top surface 4011 and the twelfth surface 4017 are all chamfered, and the radius of the chamfer is the same as the radius of the chamfer between the second top surface 4011 and the seventh surface 4012.

[0101] In this embodiment, along the direction from the second flange 41 to the second pole post 40 (i.e., along the direction from the third portion 401 to the fourth portion 402), each of the seventh surface 4012 to the twelfth surface 4017 is inclined towards the center of the second pole post 40. That is, the area of ​​the second top surface 4011 of the third portion 401 is smaller than the area of ​​the surface of the third portion 401 facing away from the fourth portion 402. This reduces wear on the mold during the manufacturing process of the second pole post 40, facilitates material flow, and improves the yield of the second pole post 40 process. Additionally, it reduces material flow resistance during the stamping process of the second pole post 40, making the surface layer of the third portion 401 less prone to cracking. For example, the angle between the seventh surface 4012 to the twelfth surface 4017 and the Z-axis is in the range of 0.05° to 5°. For instance, the angle between the seventh surface 4012 to the twelfth surface 4017 and the Z-axis is in the range of 1° to 3°.

[0102] In some other embodiments, at least a portion of the first pole post 30 and at least a portion of the second pole post 40 may also be polygonal column structures such as quadrilateral columns, octagonal columns, or circular columns, irregularly shaped columns, etc. It is understood that the polygonal column structure may be a regular polygonal column structure, such as a regular quadrilateral column, a regular octagonal column, etc.; the polygonal column structure may also not be a regular polygonal column structure, for example, by cutting away the four corners of a regular quadrilateral column to form an octagonal column with four short sides and four long sides.

[0103] In other embodiments, one or more planes can be formed by cutting the cylindrical first pole post 30 and second pole post 40 along the height direction. This makes it less likely for the first pole post 30 and second pole post 40 to rotate relative to the top cover 10 when they are connected, thus improving their torsional strength. For example, four centrally symmetrical planes can be formed by cutting the cylindrical first pole post 30 and second pole post 40 along the height direction. This provides better torsional resistance and reduces the number of processing steps required.

[0104] In this embodiment, the first pressure ring 51 is sleeved on the first pole post 30 and fixedly connects the first pole post 30 and the lower plastic 20. For example, the inner wall of the first pressure ring 51 is circular, used to mate with the second part 302 of the first pole post 30. The outer periphery of the first pressure ring 51 is approximately pentagonal, with one side being the shorter side. It is understood that the first pressure ring 51 can be obtained by cutting off a corner of a rectangular pressure ring. Thus, when the first pressure ring 51 is connected to the lower plastic 20, the first pressure ring 51 is less likely to rotate relative to the lower plastic 20 and the top cover 10, and the first pole post 30 is also less likely to rotate relative to the top cover 10, which helps to improve the torsional strength of the first pole post 30.

[0105] For example, the second pressure ring 52 is sleeved on the second pole post 40 and fixedly connects the second pole post 40 and the lower plastic 20. For example, the inner sidewall of the second pressure ring 52 is circular for mating with the fourth part 402 of the second pole post 40. The outer sidewall of the second pressure ring 52 is approximately pentagonal with one side being the shorter side. It is understood that the second pressure ring 52 can be obtained by cutting off a corner of a rectangular pressure ring. In this way, when the second pressure ring 52 is connected to the lower plastic 20, the second pressure ring 52 is less likely to rotate relative to the lower plastic 20 and the top cover 10, and thus the second pole post 40 is also less likely to rotate relative to the top cover 10, which helps to improve the torsional strength of the second pole post 40.

[0106] In this embodiment, the end cap assembly 100 further includes a first upper plastic 61 and a second upper plastic 62. Both the first upper plastic 61 and the second upper plastic 62 are annular. The first upper plastic 61 is used to fixably connect with the top cover 10 and is fitted onto the first portion 301 of the first pole post 30 and the first flange 31. That is, the first pole post 30 and the first flange 31 are connected to and insulated from the top cover 10 through the first upper plastic 61. The second upper plastic 62 is used to fixably connect with the top cover 10 and is fitted onto the third portion 401 of the second pole post 40 and the second flange 41. That is, the second pole post 40 and the second flange 41 are connected to and insulated from the top cover 10 through the second upper plastic 62.

[0107] For example, the first upper plastic 61 includes a first main body portion 611, a first inner ring portion 612, and a first outer ring portion 613. The outer periphery of the first main body portion 611 is circular, and the first main body portion 611 has a through hole. The first inner ring portion 612 is disposed around the through hole of the first main body portion 611 and protrudes from one side surface of the first main body portion 611. Both the through hole of the first main body portion 611 and the first inner ring portion 612 are regular hexagons. The first outer ring portion 613 surrounds the first main body portion 611 and is connected to the first main body portion 611. The first outer ring portion 613 partially protrudes from both side surfaces of the first main body portion 611 and forms a first limiting groove 614 with the first main body portion 611 and the first inner ring portion 612.

[0108] For example, the through hole of the first main body portion 611 and the first inner ring portion 612 are hexagonal, used for mating and connecting with the first pole post 30. In the embodiments of this application, the shape of the through hole of the first main body portion 611 and the shape of the first inner ring portion 612 can be changed to correspond to the shape of the first pole post 30. The through hole of the first main body portion 611 and the first inner ring portion 612 can be polygonal ring, circular ring or irregular ring, and this application does not limit them.

[0109] In this embodiment, the second upper plastic 62 includes a second main body portion 621, a second inner ring portion 622, and a second outer ring portion 623. The outer periphery of the second main body portion 621 is circular, and the second main body portion 621 has a through hole. The second inner ring portion 622 is disposed around the through hole of the second main body portion 621 and protrudes from one side surface of the second main body portion 621. Both the through hole of the second main body portion 621 and the second inner ring portion 622 are regular hexagons. The second outer ring portion 623 surrounds the second main body portion 621 and is connected to the second main body portion 621. The second outer ring portion 623 partially protrudes from both sides of the second main body portion 621 and forms a second limiting groove 624 with the second main body portion 621 and the second inner ring portion 622.

[0110] For example, the through hole of the second main body 621 and the second inner ring 622 are hexagonal for connecting with the second pole post 40. In the embodiments of this application, the shape of the through hole of the second main body 621 and the shape of the second inner ring 622 can be changed to correspond to the shape of the second pole post 40. The through hole of the second main body 621 and the second inner ring 622 can be polygonal ring, circular ring or irregular ring, and this application does not limit them.

[0111] In this embodiment, the end cap assembly 100 further includes a first sealing element 71 and a second sealing element 72. Both the first sealing element 71 and the second sealing element 72 are hexagonal annular elastic elements, which can be made of rubber material. The first sealing element 71 and the second sealing element 72 are respectively used to mate and connect with the first pole post 30 and the second pole post 40.

[0112] Please refer to the following: Figure 4, Figure 5 , Figure 10 as well as Figure 11 , Figure 10 for Figure 2 The diagram shows a partial structural view of the end cap assembly 100 after being cut open at one angle. Figure 11 for Figure 10 A partially enlarged schematic diagram of the end cap assembly 100 at point P.

[0113] In this embodiment, the lower plastic 20 is stacked and connected to the top cover 10. The length of the lower plastic 20 is approximately the same as the length of the top cover 10, and the width of the lower plastic 20 is approximately the same as the width of the top cover 10, with a certain tolerance range allowed. The lower plastic 20 is located on the side of the back surface 112 of the top cover body 11 facing away from the front surface 111, and is stacked and connected to the top cover 10. Exemplarily, the first surface 211 of the lower plastic 20 is opposite to and adheres to the back surface 112 of the top cover body 11. Along the thickness direction (Z-axis direction) of the top cover 10, the first through hole 22 of the lower plastic 20 is opposite to and communicates with the first through hole 12 of the top cover 10, and the second through hole 23 is opposite to and communicates with the second through hole 13 of the top cover 10.

[0114] For example, the first retaining protrusion 221A of the lower plastic 20 is inserted into the first sub-mounting groove 1211, and the first retaining protrusion 221A and the first sub-mounting groove 1211 can be mutually engaged to achieve mutual positioning. The first protrusion 222 of the lower plastic 20 is inserted into the second sub-mounting groove 1212, and the first protrusion 222 and the second sub-mounting groove 1212 can be mutually engaged to achieve mutual positioning. Figure 10 and Figure 11 The lower plastic body 21, the first retaining protrusion 221A, and the first protrusion 222 are schematically distinguished by dashed lines. The first reinforcing part 122 contacts and connects with the first retaining protrusion 221A and the first protrusion 222. Figure 10 and Figure 11 The top cover body 11 and the first reinforcing part 122 are schematically distinguished by dashed lines. At this time, the first protrusion 123 of the top cover 10 is located in the first relief groove 223 of the lower plastic 20, and the first receiving groove 221 is at least partially located in the first mounting groove 121. Figure 10 and Figure 11 The dotted lines in the diagram schematically distinguish the top cover body 11 from the first protrusion 123.

[0115] For example, the first pole post 30 passes through the first pole post through hole 22 and the first through hole 12. Specifically, the first portion 301 passes through the first through hole 12 and the first pole post through hole 22. The first pressure ring 51 is sleeved on the second portion 302 of the first pole post 30 and is fixedly connected to the second portion 302. The first pressure ring 51 is received in the first receiving groove 221 of the lower plastic 20 and is fixedly connected to the groove wall of the first receiving groove 221. Compared with the first pole post 30 being cylindrical, in this application, by setting at least a portion of the first pole post 30 as a hexagonal column (or other polygonal column), and setting the first through hole 12 and the first pole post through hole 22 to be corresponding in shape to the first pole post 30, the first pole post 30 is less likely to rotate relative to the top cover 10 when it is connected to the top cover 10, thereby improving the torsional strength of the first pole post 30 and helping to prevent the portion of the lower plastic 20 located between the first pressure ring 51 and the top cover body 11 from being cut.

[0116] For example, the first protrusion 222, the first retaining protrusion 221A, and a portion of the lower plastic body 21 are located between the top cover body 11 and the first pole post 30. In the direction perpendicular to the thickness direction of the end cover assembly 100 (i.e., in the X-axis and Y-axis directions), the projection of the first pressure ring 51 onto the lower plastic 20 overlaps with the projection of the first protrusion 123 onto the lower plastic 20. It can be understood that in the direction perpendicular to the thickness direction of the end cover assembly 100 (i.e., in the X-axis and Y-axis directions), a portion of the projection of the first pressure ring 51 onto the lower plastic 20 coincides with the projection of the first protrusion 123 onto the lower plastic 20, and a portion of the projection of the first pressure ring 51 onto the lower plastic 20 coincides with a portion of the projection of the groove sidewall of the first sub-mounting groove 1211 onto the lower plastic 20. In this embodiment, the first protrusion 123 surrounds the first mounting groove 121, increasing the height of the groove sidewall of the first mounting groove 121, thereby increasing the area of ​​the groove sidewall of the first mounting groove 121. When the first pressure ring 51 is accommodated in the first mounting groove 121, the overlapping area of ​​the top cover 10 and the first pressure ring 51 in the direction perpendicular to the thickness of the end cover assembly 100 can be increased. The first pressure ring 51 and the first pole post 30 are not easy to rotate relative to the top cover 10, which is beneficial to improving the torsional strength of the first pole post 30 and preventing the first protrusion 222, the first retaining protrusion 221A and part of the lower plastic body 21 located between the first pressure ring 51 and the top cover body 11 from being cut.

[0117] In this embodiment, the second retaining protrusion 231A of the lower plastic 20 is inserted into the third sub-mounting groove 1311, and the second retaining protrusion 231A and the second sub-mounting groove 1212 can be mutually engaged to achieve mutual positioning. The second protrusion 232 of the lower plastic 20 is inserted into the fourth sub-mounting groove 1312, and the second protrusion 232 and the fourth sub-mounting groove 1312 can be mutually engaged to achieve mutual positioning. The second reinforcing part 132 contacts and connects with the second retaining protrusion 231A and the second protrusion 232. At this time, the second protrusion 133 of the top cover 10 is located in the second clearance groove 233 of the lower plastic 20, and the second receiving groove 231 is at least partially located in the second mounting groove 131.

[0118] For example, the second pole post 40 passes through the second pole post through hole 23 and the second through hole 13. Specifically, the first part 301 passes through the first through hole 12 and the second pole post through hole 23. The second pressure ring 52 is sleeved on the fourth part 402 of the second pole post 40 and is fixedly connected to the fourth part 402. The second pressure ring 52 is received in the second receiving groove 231 of the lower plastic 20 and is fixedly connected to the groove wall of the second receiving groove 231. Compared with the second pole post 40 being cylindrical, in this application, by setting at least a portion of the second pole post 40 as a hexagonal column (or other polygonal column), and setting the second through hole 13 and the second pole post through hole 23 to be in shapes corresponding to the second pole post 40, the second pole post 40 is less likely to rotate relative to the top cover 10 when it is connected to the top cover 10, which improves the torsional strength of the second pole post 40 and helps to prevent the portion of the lower plastic 20 located between the second pressure ring 52 and the top cover body 11 from being cut.

[0119] For example, the second protrusion 232, the second retaining protrusion 231A, and a portion of the lower plastic body 21 are located between the top cover body 11 and the second pole post 40. In the direction perpendicular to the thickness direction of the end cover assembly 100 (i.e., in the X-axis and Y-axis directions), the projection of the second retaining ring 52 onto the lower plastic 20 overlaps with the projection of the second protrusion 133 onto the lower plastic 20. It can be understood that in the direction perpendicular to the thickness direction of the end cover assembly 100 (i.e., in the X-axis and Y-axis directions), a portion of the projection of the second retaining ring 52 onto the lower plastic 20 coincides with the projection of the second protrusion 133 onto the lower plastic 20, and a portion of the projection of the second retaining ring 52 onto the lower plastic 20 coincides with a portion of the projection of the groove sidewall of the third sub-mounting groove 1311 onto the lower plastic 20.

[0120] In this embodiment, by providing a second protrusion 133 around the second mounting groove 131, the height of the groove sidewall of the second mounting groove 131 is increased, thereby increasing the area of ​​the groove sidewall of the second mounting groove 131. When the second pressure ring 52 is accommodated in the second mounting groove 131, the overlapping area of ​​the top cover 10 and the second pressure ring 52 in the direction perpendicular to the thickness of the end cover assembly 100 can be increased, thereby increasing the connection area between the second pressure ring 52 and the top cover 10. The second pressure ring 52 and the second pole post 40 are less likely to rotate relative to the top cover 10, which is beneficial to improving the torsional strength of the second pole post 40 and preventing the portion of the lower plastic 20 located between the second pressure ring 52 and the top cover body 11 from being cut.

[0121] In this embodiment, the first upper plastic 61 is sleeved around the periphery of the first pole post 30 and the periphery of the first pressure ring 51, and is connected to the front surface 111 of the top cover body 11. Exemplarily, the first inner ring portion 612 of the first upper plastic 61 surrounds the first pole post 30 and is sandwiched between the first through hole 12 and the first pole post 30. The first outer ring portion 613 of the first upper plastic 61 is sleeved on the first flange 31, and the first flange 31 is connected to both the first outer ring portion 613 and the first main body portion 611.

[0122] In this embodiment, the first boss 124 of the top cover body 11 is located in the first limiting groove 614 of the first upper plastic 61, and the first boss 124 is connected to the first outer ring 613, the first main body 611 and the first inner ring 612. Figure 10 and Figure 11 The top cover body 11 and the first boss 124 are schematically distinguished by dashed lines. In this embodiment, by setting the first boss 124 at the edge of the first through hole 12, the height of the hole wall of the first through hole 12 is increased, thereby increasing the connection area between the first pole post 30 and the top cover 10. This helps to prevent the first pole post 30 from twisting relative to the top cover 10, thereby reducing the cutting of the lower plastic 20. In addition, in the length direction (i.e., the X-axis direction) of the top cover 10, by setting the second sub-mounting groove 1212, the distance from the groove sidewall of the second sub-mounting groove 1212 to the hole wall of the first through hole 12 is less than the distance from the groove sidewall of the first sub-mounting groove 1211 to the hole wall of the first through hole 12. That is, by setting the first reinforcing part 122, the distance from the groove sidewall of the first mounting groove 121 to the hole wall of the first through hole 12 can be reduced, shortening the lever arm. This allows the top cover 10 to withstand greater external force at the first mounting groove 121, which helps to improve the structural strength of the top cover 10.

[0123] In this embodiment, the second upper plastic 62 is sleeved around the periphery of the second pole post 40 and the periphery of the second pressure ring 52, and is connected to the front surface 111 of the top cover body 11. Exemplarily, the second inner ring portion 622 of the second upper plastic 62 surrounds the second pole post 40 and is sandwiched between the second through hole 13 and the second pole post 40. The second outer ring portion 623 of the second upper plastic 62 is sleeved on the second flange 41, and the second flange 41 is connected to both the second outer ring portion 623 and the second main body portion 621. Figure 10 The first main body 611, the first inner ring 612, and the first outer ring 613 are schematically distinguished by dashed lines.

[0124] In this embodiment, the second protrusion 134 of the top cover body 11 is located within the second limiting groove 624 of the second upper plastic 62, and the second protrusion 134 is connected to the second outer ring portion 623, the second main body portion 621, and the second inner ring portion 622. In this embodiment, by providing the second protrusion 134 at the edge of the second through hole 13, the height of the hole wall of the second through hole 13 is increased, thereby increasing the connection area between the second pole post 40 and the top cover 10. This helps to prevent the second pole post 40 from twisting relative to the top cover 10, thereby reducing the cutting of the lower plastic 20. Furthermore, in the length direction (i.e., the X-axis direction) of the top cover 10, by providing a fourth sub-mounting groove 1312, the distance from the groove sidewall of the fourth sub-mounting groove 1312 to the hole wall of the second through hole 13 is less than the distance from the groove sidewall of the third sub-mounting groove 1311 to the hole wall of the second through hole 13. In other words, by providing a second reinforcing part 132, the lever arm can be shortened, and the top cover 10 can withstand greater external force at the second mounting groove 131, which is beneficial to improving the structural strength of the top cover 10.

[0125] It should be understood that the first upper plastic 61 and the second upper plastic 62 are formed by in-mold injection molding after the lower plastic 20, the first pole post 30, the second pole post 40 and the top cover 10 are assembled. That is, during the forming process, they have the above-mentioned position and connection relationship with the first pole post 30, the second pole post 40, the top cover 10 and the lower plastic 20. For example, the first inner ring 612 of the first upper plastic 61 is directly formed between the first through hole 12 and the first pole post 30, and is sandwiched between the first through hole 12 and the first pole post 30; the first main body 611 of the first upper plastic 61 is directly formed between the first flange 31 and the first boss 124, and is sandwiched between the first flange 31 and the first boss 124. The second inner ring portion 622 of the second upper plastic 62 is directly formed between the second through hole 13 and the second pole post 40, and is sandwiched between the second through hole 13 and the second pole post 40; the second main body portion 621 of the second upper plastic 62 is directly formed between the second flange 41 and the second boss 134, and is sandwiched between the second flange 41 and the second boss 134.

[0126] For example, the first seal 71 is located within the first pole post through hole 22, and the first seal 71 is sleeved on the first inner ring portion 612 of the first upper plastic 61. That is, the first seal 71 is sleeved on the first pole post 30, and the first seal 71 is clamped between the top cover body 11 and the first pressure ring 51. Specifically, along the thickness direction of the end cap assembly 100, the first seal 71 is at least partially clamped between the surface of the first pressure ring 51 facing the first flange 31 and the back surface 112 of the top cover body 11. It can be understood that the first seal 71 is compressed between the first pressure ring 51, the top cover body 11, and the first upper plastic 61, and seals the first pole post through hole 22.

[0127] For example, the second seal 72 is located within the second pole post through hole 23, and the second seal 72 is sleeved on the second inner ring portion 622 of the second upper plastic 62. That is, the second seal 72 is sleeved on the second pole post 40, and the second seal 72 is clamped between the top cover body 11 and the second pressure ring 52. Specifically, along the thickness direction of the end cap assembly 100, the second seal 72 is at least partially clamped between the surface of the second pressure ring 52 facing the second flange 41 and the back surface 112 of the top cover body 11. It can be understood that the second seal 72 is compressed between the second pressure ring 52 and the top cover body 11 and the second upper plastic 62, and seals the second pole post through hole 23.

[0128] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An end cap assembly, characterized in that, Includes top cover, lower plastic, first electrode post and first pressure ring; The top cover includes a top cover body and a first protrusion. Along the thickness direction of the top cover body, the top cover body has a front side and a back side opposite to the front side. The first protrusion protrudes from the back side. The top cover has a first mounting groove and a first through hole. The first mounting groove is recessed from the surface of the first protrusion away from the top cover body towards the top cover body. The first through hole penetrates the bottom wall of the first mounting groove and the front side. The lower plastic includes a lower plastic body. Along the thickness direction of the lower plastic body, the lower plastic body includes a first surface and a second surface disposed opposite to the first surface. The lower plastic has a first receiving groove, which is formed by the second surface being recessed towards the first surface. The lower plastic is located on the back side facing away from the front side and is stacked and connected with the top cover. The first receiving groove is at least partially located in the first mounting groove, and the first pole post passes through the first through hole. The first pressure ring is sleeved on the first pole post and fixedly connected to the first pole post. The first pressure ring is at least partially located in the first receiving groove and fixedly connected to the groove wall of the first receiving groove. In a direction perpendicular to the thickness direction of the end cap assembly, the projection of the first pressure ring on the lower plastic overlaps the projection of the first protrusion on the lower plastic.

2. The end cap assembly according to claim 1, characterized in that, The first protrusion has a first plane and a first inclined surface that are connected to each other. The first plane is connected to the sidewall of the first mounting groove, and the first inclined surface is connected to the back surface. From the front to the back, the first inclined surface is inclined toward the first through hole relative to the thickness direction of the top cover.

3. The end cap assembly according to claim 2, characterized in that, In the thickness direction of the top cover, the height H1 of the first protrusion is in the range of 0.05-0.3mm.

4. The end cap assembly according to any one of claims 1 to 3, characterized in that, The top cover also includes a first reinforcing part, which protrudes from the bottom wall of the first mounting groove and surrounds the first through hole and connects to the side wall of the first mounting groove.

5. The end cap assembly according to claim 4, characterized in that, In the thickness direction of the top cover, the height H2 of the first reinforcing part is in the range of 0.1 to 0.5 mm.

6. The end cap assembly according to claim 4, characterized in that, The first reinforcing part has a third plane and a first stepped surface that are connected to each other. The third plane is located on the side of the first reinforcing part that is away from the bottom wall of the first mounting groove and is connected to the side wall of the first mounting groove. The first stepped surface is connected to the bottom wall of the first mounting groove. A chamfer R is formed at the junction of the first step surface and the third plane. 11 The connection between the first stepped surface and the bottom wall of the first mounting groove forms a chamfer R. 21 .

7. The end cap assembly according to claim 6, characterized in that, The chamfer R 11 The radius and the chamfer R 21 The radii are all in the range of 0.05-3mm.

8. The end cap assembly according to any one of claims 1 to 3, characterized in that, The top cover also includes a first protrusion, which protrudes from the front side, and the first through hole also penetrates the first protrusion. The first boss has a first peripheral side surface extending from the back side to the front side, and the first peripheral side surface is inclined toward the first through hole relative to the thickness direction of the top cover.

9. The end cap assembly according to claim 8, characterized in that, The angle between the first circumferential side and the thickness direction of the top cover is in the range of 5° to 60°.

10. The end cap assembly according to any one of claims 1 to 3, characterized in that, The first pole post is at least partially a polygonal pole post, and the shape of the first through hole matches the shape of the first pole post.

11. The end cap assembly according to claim 10, characterized in that, The first pole post includes a first part and a second part. The second part is connected to one side surface of the first part. The first part passes through the first through hole. The first part is a hexagonal post. The second part is connected to the first pressure ring.

12. The end cap assembly according to claim 11, characterized in that, The first part includes a first top surface facing and connected to the second part. The first part also includes a first surface, a second surface, a third surface, a fourth surface, a fifth surface, and a sixth surface connected in sequence. The first surface to the sixth surface are all connected to the first top surface. The first surface to the sixth surface are centrally symmetrically distributed with respect to the central axis of the first pole post. A chamfer R is formed at the junction of the first and second surfaces. 01 The chamfer R 01 The radius is in the range of 0.5mm to 5.0mm.

13. The end cap assembly according to claim 12, characterized in that, A chamfer R is formed at the junction of the first top surface and the first surface. 02 The chamfer R 02 The radius is in the range of 0.1 mm to 1 mm.

14. The end cap assembly according to claim 12 or 13, characterized in that, Along the direction from the first part to the second part, the first surface is inclined toward the center of the first pole post.

15. The end cap assembly according to claim 14, characterized in that, The angle between the first surface and the thickness direction of the top cover is in the range of 0.05° to 5°.

16. The end cap assembly according to any one of claims 1 to 3, characterized in that, The lower plastic also includes a first relief groove, which is formed by the first surface being recessed towards the second surface, and the first relief groove is correspondingly provided with the first protrusion.

17. The end cap assembly according to any one of claims 1 to 3, characterized in that, The first receiving groove forms a first retaining protrusion on the first surface, and the lower plastic also includes a first protrusion, which protrudes from the side surface of the first retaining protrusion facing away from the first surface. The first mounting groove includes a first sub-mounting groove and a second sub-mounting groove arranged and connected along the thickness direction of the top cover. The first retaining protrusion is inserted into the first sub-mounting groove, and the first protrusion is inserted into the second sub-mounting groove.

18. An energy storage device, characterized in that, It includes a housing and an end cap assembly as claimed in any one of claims 1 to 17, the end cap assembly being mounted on the housing and sealing an opening in the housing.

19. An electrical appliance, characterized in that, Includes the energy storage device as described in claim 18, wherein the energy storage device is used to store electrical energy.

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