End cap assembly, energy storage apparatus and electrical device

Abstract

An end cap assembly (100), an energy storage apparatus (1000) and an electrical device. The end cap assembly (100) comprises a top cap (10), lower plastic (20), a first post (30) and a first pressing ring (51); the top cap (10) comprises a first protrusion (123); the top cap (10) is provided with a first mounting groove (121); the lower plastic (20) is provided with a first accommodating groove (221); the lower plastic (20) and the top cap (10) are stacked and connected to each other; the first accommodating groove (221) is at least partially located within the first mounting groove (121); the first post (30) passes through the top cap (10) and the lower plastic (20); the first pressing ring (51) is sleeved on the first post (30) and is fixedly connected to the first post (30); the first pressing ring (51) is at least partially located within the first accommodating groove (221) and is fixedly connected to the wall of the first accommodating groove (221); in a direction perpendicular to the thickness direction of the end cap assembly (100), the projection of the first pressing ring (51) on the lower plastic (20) covers the projection of the first protrusion (123) on the lower plastic (20).

Description

End cover assembly, energy storage device and electrical equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 27, 2024, with application number 2024103614244 and application name “End cover assembly, energy storage device and electrical equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

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

[0003] Rechargeable batteries, also known as rechargeable batteries or storage batteries, are batteries that can be recharged after discharge to reactivate their active materials and continue to be used. Their recyclable nature has made them a key power source for electrical devices. As demand for secondary batteries grows, so too has the demand for their reliability.

[0004] In existing secondary batteries, after the pole is embedded in the lower plastic through a pressure ring, the pressure ring will twist relative to the top cover under the drive of the pole, and will squeeze and cut the lower plastic. Summary of the Invention

[0005] The present application provides an end cover assembly that can prevent the lower plastic from being cut.

[0006] The end cover assembly includes a top cover, a lower plastic, a first pole and a 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 face and a back face arranged opposite to the front face, the first protrusion is convexly arranged on the back face, 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 facing away from the top cover body to the top cover body, and the first through hole passes through the bottom wall and the front face of the first mounting groove; 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 arranged opposite to the first surface surface; the lower plastic has a first receiving groove, and the first receiving groove is formed by the second surface being recessed toward the first surface; the lower plastic is located on the side of the back side facing away from the front side, and is stacked and connected to the top cover, the first receiving groove is at least partially located in the first mounting groove, and the first pole is passed through the first through hole; the first pressure ring is sleeved on the first pole and fixedly connected to the first pole, 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.

[0007] In the embodiment of the present application, a first protrusion is provided on the top cover, and the first protrusion surrounds the first mounting groove, thereby increasing the height of the sidewalls of the first mounting groove, thereby increasing the area of ​​the sidewalls of the first mounting groove. When the first pressure ring is accommodated in the first mounting groove, the overlapping area between the top cover and the first pressure ring in a direction perpendicular to the thickness of the end cap 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 not easily rotated relative to the top cover, which is beneficial to improving the torsional strength of the first pole and preventing the portion of the lower plastic located between the first pressure ring and the top cover body from being cut.

[0008] The present application also provides an energy storage device, which includes a shell and the end cover assembly as described above, wherein the end cover assembly is installed on the shell and seals the opening of the shell.

[0009] The present application also provides an electrical device, which includes the above-mentioned energy storage device, and the energy storage device is used to store electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained like these drawings without any creative work.

[0011] FIG1 is a diagram illustrating an application scenario of an energy storage device provided in an embodiment of the present application;

[0012] FIG2 is a schematic diagram of the three-dimensional structure of the energy storage device shown in FIG1 ;

[0013] FIG3 is a schematic structural diagram of the end cover assembly shown in FIG2 ;

[0014] FIG4 is a partial structural exploded schematic diagram of the end cap assembly shown in FIG3 ;

[0015] FIG5 is a partial exploded schematic diagram of the end cap assembly shown in FIG3 from another angle;

[0016] FIG6 is a partial enlarged view of the end cover assembly shown in FIG5 at position M;

[0017] FIG7 is a partial enlarged view of the end cover assembly shown in FIG4 at position N;

[0018] FIG8A is a schematic structural diagram of the first pole and the first flange shown in FIG4 ;

[0019] FIG8B is a schematic diagram of a partial structure of the first pole and the first flange shown in FIG8A after being cut at an angle;

[0020] FIG9A is a schematic structural diagram of the second pole and the second flange shown in FIG4 ;

[0021] FIG9B is a schematic diagram of a partial structure of the second pole and the second flange shown in FIG9A cut at an angle;

[0022] FIG10 is a schematic diagram of a partial structure of the end cap assembly shown in FIG2 after being cut away at an angle;

[0023] FIG11 is a partial enlarged schematic diagram of the end cover assembly shown in FIG10 at position P. ...

[0024] The nouns corresponding to the main reference numerals in the figure are: 2000 electric energy conversion device, 3000 wind energy conversion device, 4000 power grid, 1000 energy storage device, 400 housing, 100 end cover assembly, 10 top cover, 11 top cover body, 111 front face, 112 back face, 12 first through hole, 121 first mounting groove, 1211 first sub-mounting groove, 1212 second sub-mounting groove, 122 first reinforcement portion, 1221 third plane, 1222 first step 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 reinforcement portion, 1321 fourth plane, 1322 second step 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 protection sheet, 20 lower plastic, 21 lower plastic body, 211 first surface, 212 second surface, 2 2 First pole through hole, 221 First receiving groove, 221A First holding protrusion, 222 First protrusion, 223 First avoidance groove, 23 Second pole through hole, 231 Second receiving groove, 231A Second holding protrusion, 232 Second protrusion, 233 Second avoidance groove, 30 First pole, 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, 401 Third part Points, 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 part, 613 first outer ring part, 614 first limiting groove, 62 second upper plastic, 621 second main body, 622 second inner ring part, 623 second outer ring part, 624 second limiting groove, 71 first sealing member, 72 second sealing member. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0026] Please refer to Figure 1, which is an application scenario diagram of the energy storage device 1000 provided in an embodiment of the present application. The energy storage device 1000 provided in an embodiment of the present application is applied to an energy storage system, which includes an electric energy conversion device 2000 (photovoltaic panel), a wind energy conversion device 3000 (wind turbine), a power grid 4000 and an energy storage device 1000. The energy storage device 1000 can be used as an energy storage cabinet and can be installed outdoors. Specifically, the electric energy conversion device 2000 (photovoltaic panel) can convert solar energy into electric energy during periods of low electricity prices. The energy storage device 1000 is used to store the electric energy and supply it to the power grid 4000 during peak electricity consumption, or to supply power when the power grid 4000 is out of power / outage. The wind energy conversion device 3000 (wind turbine) can convert wind energy into electric energy. The energy storage device 1000 is used to store the electric energy and supply it to the power grid 4000 during peak electricity consumption, or to supply power when the power grid 4000 is out of power / outage. Among them, the transmission of electric energy can be carried out using high-voltage cables.

[0027] It is understandable that the energy storage device 1000 may include but is not limited to single cells, battery modules, battery packs, battery systems, etc. The actual application form of the energy storage device 1000 provided in the embodiment of the present application may be, but is not limited to, the products listed, and may also be other application forms. The embodiment of the present application 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 are connected in series or in parallel. The multiple energy storage devices 1000 are supported and electrically connected using isolation plates (not shown). In this embodiment, "multiple" refers to two or more.

[0028] The present embodiment is described by taking the energy storage device 1000 as a single battery as an example, wherein the single battery may include one or more bare cells.

[0029] Please refer to FIG. 2 , which is a schematic diagram of the three-dimensional structure of the energy storage device 1000 shown in FIG. 1 .

[0030] 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 is provided with a receiving cavity. The receiving cavity of the housing 400 is connected to 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 sealed to the opening of the housing 400. The end cap assembly 100 is mounted on one end of the electrode assembly and is electrically connected to the electrode assembly. For ease of description, the length direction of the end cap assembly 100 shown in FIG2 is defined as the X-axis direction, the width direction of the end cap assembly 100 is defined as the Y-axis direction, and the thickness direction of the end cap assembly 100 is defined as the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other. The directional terms such as "upper" and "lower" mentioned in the description of the embodiments of the present application are described based on the orientation shown in FIG2 of the specification, with the direction toward the positive Z-axis being "upper" and the direction toward the negative Z-axis being "lower". They do not constitute a limitation on the actual application scenario of the energy storage device 1000. The terms “same” and “perpendicular” used in the following text are subject to certain tolerances.

[0031] Please refer to Figures 3, 4 and 5 in combination. Figure 3 is a structural schematic diagram of the end cover assembly 100 shown in Figure 2, Figure 4 is a partial structural decomposition schematic diagram of the end cover assembly 100 shown in Figure 3, and Figure 5 is a partial structural decomposition schematic diagram of the end cover assembly 100 shown in Figure 3 from another angle.

[0032] In this embodiment, the end cap assembly 100 includes a top cover 10, a lower plastic 20, a first pole 30, a second pole 40, a first pressure ring 51, and a second pressure ring 52. The top cover 10 in this embodiment is a plain aluminum part, and the lower plastic 20 is made of plastic and is insulated. The lower plastic 20 is mounted on one side of the top cover 10. The first pole 30 and the second pole 40 are used to electrically connect to the electrode assembly. Exemplarily, one end of the first pole 30 is connected to a first flange 31. One end of the second pole 40 is connected to a second flange 41. It should be noted that the first pole 30 can be a positive pole, the second pole 40 can be a negative pole, the first flange 31 is a positive pole flange, and the second flange 41 is a negative pole flange; alternatively, the first pole 30 can be a negative pole, the second pole 40 can be a positive pole, the first flange 31 is a negative pole flange, and the second flange 41 is a positive pole flange.

[0033] Exemplarily, 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 a long thin plate, which includes a front face 111 and a back face 112 arranged opposite to the front face 111 along the thickness direction of the top cover body 11 (i.e., the Z-axis direction). The top cover 10 has a first through hole 12 and a second through hole 13. The first through hole 12 and the second through hole 13 both pass through the front face 111 and the back face 112 of the top cover body 11. The first through hole 12 and the second through hole 13 are respectively arranged at opposite ends of the top cover body 11 (arranged along the X-axis direction) for allowing the first pole 30 and the second pole 40 to pass through.

[0034] For example, both the first through-hole 12 and the second through-hole 13 are hexagonal, adapted to match the shapes of the first and second poles 30 and 40. This prevents the first and second poles 30 and 40 from rotating relative to the top cover 10 when connected to the top cover 10, thereby improving the torsional strength of the first and second poles 30 and 40. In the embodiments of the present application, the first and second through-holes 12 and 13 can be modified to correspond to the shape of the first pole 30. The first and second through-holes 12 and 13 can be polygonal, circular, or irregularly shaped, in addition to hexagonal shapes, and this is not limited in this application.

[0035] For example, along the length of the top cover 10 (i.e., the X-axis), the second through hole 13, the injection hole 15, the explosion-proof valve 14, and the first through hole 12 are sequentially spaced apart. 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 excessive, the explosion-proof valve 14 automatically opens to relieve pressure and prevent an explosion. The injection hole 15 is located between the second through hole 13 and the explosion-proof valve 14. During the battery's injection process, electrolyte is injected into the battery through the injection hole 15 on the top cover 10.

[0036] In some embodiments, the top cover 10 may further include an explosion-proof valve protection sheet 16 . The explosion-proof valve protection sheet 16 is disposed opposite to the explosion-proof valve 14 and covers the explosion-proof valve 14 .

[0037] Please refer to FIG. 4 , FIG. 5 and FIG. 6 in combination. FIG. 6 is a partial enlarged view of the end cover assembly 100 at position M shown in FIG. 5 .

[0038] In this embodiment, the top cover 10 further includes a first protrusion 123 and a second protrusion 133, both of which are protruding 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). The top cover 10 also has a first mounting groove 121 and a second mounting groove 131. The first mounting groove 121 is recessed toward the top cover body 11 from the surface of the first protrusion 123 facing away from the top cover body 11. The first through hole 12 extends through the bottom wall and front surface 111 of the first mounting groove 121. The second mounting groove 131 is recessed toward the top cover body 11 from the surface of the second protrusion 133 facing away from the top cover body 11. The second through hole 13 extends through the bottom wall and front surface 111 of the second mounting groove 131. The first and second mounting grooves 121 and 131 are symmetrically arranged about the midline of the length of the top cover body 11. The first and second mounting grooves 121 and 131 are configured to engage with the lower plastic 20.

[0039] Exemplarily, the first protrusion 123 is annular and surrounds the first through hole 12. The first protrusion 123 has a first flat surface 1231 and a first inclined surface 1232 that are connected to each other. The first flat surface 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 flat surface 1231 can 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 relative to the thickness direction of the top cover 10 (i.e., the Z-axis direction) toward the first through hole 12.

[0040] In an embodiment of the present application, the first protrusion 123 can be formed by a stamping process. By setting a first inclined surface 1232 on the first protrusion 123, material flow is facilitated during the process of stamping and blanking the top cover 10 to form the first protrusion 123. The first protrusion 123 can be obtained by stamping the top cover 10 once, thereby eliminating the need for machining and reducing the processing steps of the top cover 10, which is beneficial to improving the production efficiency of the top cover 10 and reducing costs.

[0041] In this embodiment, the height H1 of the first protrusion 123 in the thickness direction of the top cover 10 is within the range of 0.05-0.3 mm. That is, the distance between the first flat surface 1231 and the back surface 112 is within the range of 0.05-0.3 mm, for example, 0.05 mm, 0.1 mm, 0.3 mm, etc. In this way, the first protrusion 123 can be formed by a single stamping operation without the need for machining, thereby improving the production efficiency of the top cover 10 and reducing costs. It also avoids workpiece burrs caused by machining.

[0042] Illustratively, the second protrusion 133 is annular and surrounds the second through-hole 13. The second protrusion 133 has a second flat surface 1331 and a second inclined surface 1332 that are connected to each other. The second flat surface 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 relative to the thickness direction of the top cover 10 (i.e., the Z-axis direction) toward the second through-hole 13.

[0043] In an embodiment of the present application, the second protrusion 133 can be formed by a stamping process. By setting a second inclined surface 1332 on the second protrusion 133, material flow is facilitated during the process of stamping and blanking the top cover 10 to form the second protrusion 133. The second protrusion 133 can be obtained by stamping the top cover 10 once, thereby eliminating the need for machining and reducing the processing steps of the top cover 10, which is beneficial to improving the production efficiency of the top cover 10 and reducing costs.

[0044] In this embodiment, the height of the second protrusion 133 in the thickness direction of the top cover 10 is within the range of 0.05-0.3 mm. That is, the distance between the second flat surface 1331 and the back surface 112 is within the range of 0.05-0.3 mm, for example, 0.05 mm, 0.1 mm, 0.3 mm, etc. In this way, the second protrusion 133 can be formed by a single stamping operation without the need for machining, thereby improving the production efficiency of the top cover 10 and reducing costs. It also avoids workpiece burrs caused by machining.

[0045] In this embodiment, the top cover 10 further includes a first reinforcing portion 122 and a second reinforcing portion 132. The first reinforcing portion 122 is protruding from the bottom wall of the first mounting groove 121, and the first reinforcing portion 122 surrounds the first through hole 12 and is connected to the side wall of the first mounting groove 121. That is, the first reinforcing portion 122 is annular and is arranged around the first through hole 12. In this embodiment of the present application, the first mounting groove 121 can be formed by a stamping process. By providing the first reinforcing portion 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, so that the top cover 10 is not easily deformed during the process of piercing the top cover 10.

[0046] Illustratively, 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 the bottom wall of the first sub-mounting groove 1211 being recessed toward the front surface 111. The first through hole 12 penetrates the bottom wall of the first sub-mounting groove 1211 and the bottom wall of the second sub-mounting groove 1212.

[0047] Illustratively, the first reinforcement portion 122 has a third flat surface 1221 and a first stepped surface 1222 that are interconnected. The third flat surface 1221 is located on the side of the first reinforcement portion 122 facing away from the bottom wall of the first mounting groove 121 and connects to the side walls of the first mounting groove 121. The first stepped surface 1222 connects to the bottom wall of the first mounting groove 121. The third flat surface 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.

[0048] For example, the height H2 of the first reinforcing portion 122 in the thickness direction of the top cover 10 is within a 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 within a range of 0.1 to 0.5 mm. For example, H2 can be within a range of 0.2 to 0.3 mm. This provides a more rational structural design for the top cover 10 and enhances its strength.

[0049] Exemplarily, the first step surface 1222 is an inclined surface. From the back surface 112 to the front surface 111, the first step surface 1222 is inclined toward the first through hole 12 relative to the thickness direction of the top cover 10. The connection between the first step surface 1222 and the third plane 1221 is chamfered to form a chamfer R11. The connection between the first step surface 1222 and the bottom wall of the first mounting groove 121 is chamfered to form a chamfer R21. That is, there is also a smooth transition between the first step surface 1222 and the bottom wall of the first sub-mounting groove 1211, and a smooth transition between the first step surface 1222 and the bottom wall of the second sub-mounting groove 1212. In this way, the flow of material is facilitated during the piercing process of the top cover 10, and the first sub-mounting groove 1211 and the second sub-mounting groove 1212 can be formed by a single stamping process without the need for machining and cutting, thereby reducing the processing steps of the top cover 10, which is conducive to improving production efficiency and reducing costs. Exemplarily, the radius of chamfer R11 and the radius of chamfer R21 are in the range of 0.05-3 mm.

[0050] In this embodiment, the second reinforcement portion 132 protrudes from the bottom wall of the second mounting groove 131. The second reinforcement portion 132 surrounds the second through hole 13 and connects to the side walls of the second mounting groove 131. In other words, the second reinforcement portion 132 is annular and surrounds the second through hole 13. In this embodiment of the present application, the second mounting groove 131 can be formed using a stamping process. By providing the second reinforcement portion 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 preventing deformation during the pressing process.

[0051] Exemplarily, 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 the bottom wall of the third sub-mounting groove 1311 being recessed toward the front surface 111. The second through hole 13 penetrates the bottom wall of the third sub-mounting groove 1311 and the bottom wall of the fourth sub-mounting groove 1312.

[0052] Illustratively, the second reinforcement portion 132 has a fourth flat surface 1321 and a second stepped surface 1322 that are interconnected. The fourth flat surface 1321 is located on the side of the second reinforcement portion 132 facing away from the bottom wall of the second mounting groove 131 and connects to the sidewalls of the second mounting groove 131. The second stepped surface 1322 connects to the bottom wall of the second mounting groove 131. The fourth flat surface 1321 serves as the bottom wall of the third sub-mounting groove 1311. The second stepped surface 1322 serves as the sidewall of the fourth sub-mounting groove 1312. The second stepped surface 1322 connects the bottom wall of the third sub-mounting groove 1311 and the bottom wall of the fourth sub-mounting groove 1312.

[0053] For example, the height of the second reinforcing portion 132 in the thickness direction of the top cover 10 is within a 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 within a range of 0.1 to 0.5 mm. For example, it can be within a range of 0.2 to 0.3 mm. This provides a more rational structural design for the top cover 10 and enhances its strength.

[0054] Exemplarily, the second step surface 1322 is an inclined surface. From the back surface 112 to the front surface 111, the second step surface 1322 is inclined toward 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 chamfered to form a chamfer R12. The connection between the second step surface 1322 and the bottom wall of the second mounting groove 131 is chamfered to form a chamfer R22. That is, there is also a smooth transition between the second step surface 1322 and the bottom wall of the third sub-mounting groove 1311, and a smooth transition between the second step surface 1322 and the bottom wall of the fourth sub-mounting groove 1312. In this way, the flow of material is facilitated during the piercing process of the top cover 10, and the third sub-mounting groove 1311 and the fourth sub-mounting groove 1312 can be formed by a single stamping process without the need for machining, thereby reducing the processing steps of the top cover 10, which is conducive to improving production efficiency and reducing costs. Exemplarily, the radius of chamfer R12 and the radius of chamfer R22 are in the range of 0.05-3 mm.

[0055] Please refer to FIG. 4 , FIG. 5 and FIG. 7 in combination. FIG. 7 is a partial enlarged view of the end cover assembly 100 at position N shown in FIG. 4 .

[0056] In this embodiment, the top cover 10 further includes a first boss 124 and a second boss 134. The first boss 124 and the second boss 134 are located at opposite ends of the top cover body 11 (arranged along the X-axis) and are respectively configured to engage with the first and second upper plastic members. The first boss 124 and the second boss 134 are both projecting from the front face 111 of the top cover body 11. The first through hole 12 extends through the first boss 124. The second through hole 13 extends through the second boss 134.

[0057] Exemplarily, the first boss 124 is annular, and the inner periphery of the first boss 124 is hexagonal, for being matched with and connected to the first pole 30. The outer periphery of the first boss 124 is roughly circular. The first boss 124 has a first boss top surface 1241 facing away from the front side 111 and a first circumferential side surface 1242 connected to the first boss top surface 1241, and the first circumferential side surface 1242 is also connected to the front side 111 of the top cover body 11. The first circumferential side surface 1242 is an inclined surface, and from the back side 112 to the front side 111, the first circumferential side surface 1242 is inclined toward the first through hole 12 relative to the thickness direction of the top cover 10 (that is, the Z-axis direction). In this way, in the process of forming the first boss 124 on the top cover 10 by upsetting, it is easy to realize the flow of material to the first through hole 12, thereby reducing the wear of the stamping die by the top cover 10, improving the die life and product yield, and reducing the generation of metal wire.

[0058] For example, the angle between the first peripheral side surface 1242 and the Z-axis direction is in the range of 5° to 60°. The angle between the first peripheral side surface 1242 and the Z-axis direction can be in the range of 10° to 30°, for example, 10°, 20°, 30°, etc.

[0059] Exemplarily, the second boss 134 is annular, and the inner periphery of the second boss 134 is hexagonal, for being matched with the second pole 40 for connection. The outer periphery of the second boss 134 is roughly circular. The second boss 134 has a second boss top surface 1341 facing away from the front 111 and a second peripheral side surface 1342 connected to the second boss top surface 1341, and the second peripheral side surface 1342 is also connected to the front 111 of the top cover body 11. The second peripheral side surface 1342 is an inclined surface, and from the back 112 to the front 111, the second peripheral side surface 1342 is inclined toward the second through hole 13 relative to the thickness direction of the top cover 10 (that is, the Z-axis direction). In this way, in the process of forming the second boss 134 on the top cover 10 by upsetting, it is easy to realize the flow of material to the second through hole 13, thereby reducing the wear of the stamping die by the top cover 10, improving the die life and product yield, and reducing the generation of metal wire.

[0060] For example, the angle between the second peripheral side surface 1342 and the Z-axis direction is in the range of 5° to 60°. The angle between the second peripheral side surface 1342 and the Z-axis direction can be in the range of 10° to 30°, for example, 10°, 20°, 30°, etc.

[0061] Please refer to Figures 4 and 5 again. In this embodiment, the lower plastic 20 includes a lower plastic body 21. The lower plastic body 21 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 arranged opposite to the first surface 211.

[0062] Illustratively, the lower plastic 20 has a first terminal through-hole 22, a first receiving groove 221, a second terminal through-hole 23, and a second receiving groove 231. The first receiving groove 221 is formed by the second surface 212 being recessed toward the first surface 211, and a first retaining protrusion 221A is formed on the first surface 211. The first terminal through-hole 22 extends through the bottom wall of the first receiving groove 221 and the first surface 211, that is, through the first retaining protrusion 221A.

[0063] Illustratively, the first receiving groove 221 and the first terminal through-hole 22 are coaxially disposed and positioned near one end of the lower plastic body 21. The first terminal through-hole 22 is configured to allow the first terminal 30 to pass through. The first terminal through-hole 22 is a hexagonal through-hole configured to engage with the first terminal 30. The first receiving groove 221 is configured to accommodate the first pressure ring 51.

[0064] Illustratively, the second receiving groove 231 is formed by the second surface 212 being recessed toward the first surface 211, and a second retaining protrusion 231A is formed on the first surface 211. The second pole through hole 23 passes through the first surface 211 and the second surface 212, and the second pole through hole 23 passes through the bottom wall of the second receiving groove 231, that is, through the second retaining protrusion 231A.

[0065] Exemplarily, the second receiving groove 231 and the second pole through-hole 23 are coaxially disposed and located near the other end of the lower plastic body 21. The second pole through-hole 23 is configured to allow the second pole 40 to pass through. The second pole through-hole 23 is a hexagonal through-hole configured to engage with the second pole 40. The second receiving groove 231 is configured to accommodate the second pressure ring 52.

[0066] In this embodiment, the lower plastic member 20 further includes a first protrusion 222 and a second protrusion 232. The first protrusion 222 is provided on the side 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 through-hole 22 extends through the first protrusion 222. The first retaining protrusion 221A and the first protrusion 222 are respectively configured to mate with the first sub-mounting groove 1211 and the second sub-mounting groove 1212. The second protrusion 232 is provided on the side 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 through-hole 23 extends through the second protrusion 232. The second retaining protrusion 231A and the second protrusion 232 are respectively configured to mate with the third sub-mounting groove 1311 and the fourth sub-mounting groove 1312.

[0067] In this embodiment, the lower plastic 20 further includes a first avoidance groove 223 and a second avoidance groove 233. Both the first avoidance groove 223 and the second avoidance groove 233 are formed by the first surface 211 being recessed toward the second surface 212. The first avoidance groove 223 is disposed around the first retaining protrusion 221A. The first avoidance groove 223 is configured to correspond to the first protrusion 123 of the top cover 10, avoiding the first protrusion 123. The second avoidance groove 233 is disposed around the second retaining protrusion 231A. The second avoidance groove 233 is configured to correspond to the second protrusion 133 of the top cover 10, avoiding the second protrusion 133.

[0068] 5 , 8A and 8B , FIG. 8A is a schematic structural diagram of the first pole 30 and the first flange 31 shown in FIG. 4 , and FIG. 8B is a schematic structural diagram of a portion of the first pole 30 and the first flange 31 shown in FIG. 8A after being cut at an angle.

[0069] In this embodiment, the first pole 30 is at least partially a hexagonal column. It is understandable that the first pole 30 can be partially a hexagonal column, or the first pole 30 can be entirely a hexagonal column. Exemplarily, the first pole 30 includes a first portion 301 and a second portion 302. In Figure 8B, dotted lines are used to schematically distinguish the first portion 301, the second portion 302, and the first flange 31. The second portion 302 is connected to a side surface of the first portion 301, and the first portion 301 and the second portion 302 are coaxially arranged. The first portion 301 is shaped like a regular hexagonal column, and the second portion 302 is shaped like a cylinder. In the height direction of the first pole 30 (i.e., the Z-axis direction), the projected area of ​​the second portion 302 is smaller than the projected area of ​​the first portion 301. The first portion 301 is used to penetrate the first through hole 12 and cooperate with the top cover 10 to obtain higher torsional strength, and the second portion 302 is used to cooperate with the first pressure ring 51. The second portion 302 is also used to electrically connect to the electrode assembly of the energy storage device 1000 .

[0070] In this embodiment, the first flange 31 is cylindrical. The first flange 31 is located on the side of the first portion 301 facing away from the second portion 302 and is connected to the first portion 301. The first portion 301 can be located in the middle of the first flange 31. The first pole 30 and the first flange 31 are integrally formed components and can be formed using a stamping process. Exemplarily, the first portion 301 of the first pole 30 includes a first top surface 3011 facing and connected to the second portion 302. The first portion 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, which are connected in sequence. The first surface 3012 through the sixth surface 3017 are all connected to the first top surface 3011. The first surface 3012 through the sixth surface 3017 are centrally symmetrically distributed about the central axis O1-O1 of the first pole 30.

[0071] In this embodiment, each two adjacent surfaces from the first surface 3012 to the sixth surface 3017 are chamfered, that is, each two adjacent surfaces from the first surface 3012 to the sixth surface 3017 have a smooth transition. In this way, during the manufacturing process of the first pole 30, the wear on the mold can be reduced, while being beneficial to the flow of material and improving the process yield of the first pole 30; in addition, the material flow resistance during the stamping process of the first pole 30 can be reduced, and the surface layer of the first part 301 is not prone to cracking. Exemplarily, the connection between the first surface 3012 and the second surface 3013 is chamfered to form a chamfer R01, that is, a smooth transition is formed between the first surface 3012 and the second surface 3013. The radius of the chamfer R01 is in the range of 0.5 mm to 5.0 mm. For example, the radius of the chamfer R01 can be in the range of 1.5 mm to 2.5 mm.

[0072] For example, the connection between the second surface 3013 and the third surface 3014, the connection between the third surface 3014 and the fourth surface 3015, the connection between the fourth surface 3015 and the fifth surface 3016, the connection between the fifth surface 3016 and the sixth surface 3017, and the connection between the sixth surface 3017 and the first surface 3012 are all chamfered. For details, please refer to the chamfer between the first surface 3012 and the second surface 3013, which will not be repeated here.

[0073] In this embodiment, the connections between the first top surface 3011 and the first surface 3012, the second surface 3013, the third surface 3014, the fourth surface 3015, the fifth surface 3016, and the sixth surface 3017 are all rounded. That is, the first top surface 3011 and the first surface 3012, the second surface 3013, the third surface 3014, the fourth surface 3015, the fifth surface 3016, and the sixth surface 3017 all have smooth transitions. This can reduce the manufacturing difficulty of the first electrode 30 and facilitate material flow during the manufacturing process of the first electrode 30. For example, a chamfer R02 is formed at the connection between the first top surface 3011 and the first surface 3012. The radius of the chamfer R02 is in the range of 0.1 mm to 1 mm. For example, the radius of the chamfer R02 is in the range of 0.25 mm to 0.5 mm.

[0074] Exemplarily, chamfers are formed at 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, and the range of the radius of the chamfer is the same as the range of the radius of the chamfer between the first top surface 3011 and the first surface 3012.

[0075] In this embodiment, along the direction from the first flange 31 toward the first terminal 30 (i.e., along the direction from the first portion 301 toward the second portion 302), each of the first through sixth surfaces 3012 through 3017 is inclined toward the center of the first terminal 30. That is, each of the first through sixth surfaces 3012 through 3017 is arranged at an angle with the Z-axis. In this case, 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 mold wear during the manufacturing process of the first terminal 30, facilitates material flow, and improves the manufacturing yield of the first terminal 30. Furthermore, it reduces material flow resistance during the stamping process of the first terminal 30, making the first portion 301 less susceptible to surface cracking. Exemplarily, the angle between the first through sixth surfaces 3012 through 3017 and the Z-axis is in the range of 0.05° to 5°. For example, the angle between the first through sixth surfaces 3012 through 3017 and the Z-axis is in the range of 1° to 3°.

[0076] Please refer to Figures 5, 9A, and 9B in conjunction. Figure 9A is a schematic diagram of the structure of the second pole 40 and second flange 41 shown in Figure 4. Figure 9B is a schematic diagram of the partial structure of the second pole 40 and second flange 41 shown in Figure 9A, cut at an angle. In some embodiments, the second pole 40 is at least partially hexagonal. It is understood that the second pole 40 can be partially or entirely hexagonal. Exemplarily, the second pole 40 includes a third portion 401 and a fourth portion 402. In Figure 9B, dashed lines schematically distinguish the third portion 401, the fourth portion 402, and the second flange 41. The fourth portion 402 is connected to a side surface of the third portion 401, and the third and fourth portions 401 and 402 are coaxially arranged. The third portion 401 is shaped like a regular hexagonal pole, and the fourth portion 402 is shaped like a cylinder. In the height direction of the second electrode 40 (i.e., the Z-axis direction), the projected area of ​​the fourth portion 402 is smaller than the projected area of ​​the third portion 401. The third portion 401 is used to penetrate the second through hole 13 and to mate with the top cover 10 to achieve high torsional strength, while the fourth portion 402 is used to mate with the second pressure ring 52. The second portion 302 is also used to electrically connect to the electrode assembly of the energy storage device 1000.

[0077] In this embodiment, the second flange 41 is cylindrical. The second flange 41 is located on the side of the third portion 401 facing away from the fourth portion 402 and is connected to the third portion 401. The third portion 401 can be located in the middle of the second flange 41. The second pole 40 and the second flange 41 are integrally formed components and can be formed using a stamping process. Exemplarily, the third portion 401 of the second pole 40 includes a second top surface 4011 facing toward and connected to the fourth portion 402. The third portion 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, which are connected in sequence. The seventh through twelfth surfaces 4012 through 4017 are all connected to the second top surface 4011. The seventh through twelfth surfaces 4012 through 4017 are centrally symmetrically distributed about the central axis O2-O2 of the second pole 40.

[0078] In this embodiment, each two adjacent surfaces from the seventh surface 4012 to the twelfth surface 4017 are chamfered, that is, each two adjacent surfaces from the seventh surface 4012 to the twelfth surface 4017 have a smooth transition. In this way, during the manufacturing process of the second pole 40, wear on the mold can be reduced, while being beneficial to material flow and improving the manufacturing yield of the second pole 40; in addition, the material flow resistance during the stamping process of the second pole 40 can be reduced, and the surface layer of the third part 401 is not prone to cracking. Exemplarily, the connection between the seventh surface 4012 and the eighth surface 4013 is chamfered to form a chamfer R03, that is, a smooth transition is formed between the seventh surface 4012 and the eighth surface 4013. The radius of the chamfer R03 is in the range of 0.5 mm to 5.0 mm. For example, the radius of the chamfer R03 can be in the range of 1.5 mm to 2.5 mm.

[0079] For example, the connection between the eighth surface 4013 and the ninth surface 4014, the connection between the ninth surface 4014 and the tenth surface 4015, the connection between the tenth surface 4015 and the eleventh surface 4016, the connection between the eleventh surface 4016 and the twelfth surface 4017, and the connection between the twelfth surface 4017 and the seventh surface 4012 are all chamfered. For details, please refer to the chamfer between the seventh surface 4012 and the eighth surface 4013, which will not be repeated here.

[0080] In this embodiment, the connections between the second top surface 4011 and the seventh surface 4012, the eighth surface 4013, the ninth surface 4014, the tenth surface 4015, the eleventh surface 4016, and the twelfth surface 4017 are all chamfered. That is, the second top surface 4011 and the seventh surface 4012, the eighth surface 4013, the ninth surface 4014, the tenth surface 4015, the eleventh surface 4016, and the twelfth surface 4017 all have smooth transitions. This reduces the manufacturing process difficulty of the second electrode 40 and facilitates material flow during the manufacturing process of the second electrode 40. For example, a chamfer R04 is formed at the connection between the second top surface 4011 and the seventh surface 4012. The radius of chamfer R04 is in the range of 0.1 mm to 1 mm. For example, the radius of chamfer R04 is in the range of 0.25 mm to 0.5 mm.

[0081] Illustratively, chamfers are formed at the connection between the second top surface 4011 and the eighth surface 4013, the connection between the second top surface 4011 and the ninth surface 4014, the connection between the second top surface 4011 and the tenth surface 4015, the connection between the second top surface 4011 and the eleventh surface 4016, and the connection between the second top surface 4011 and the twelfth surface 4017, and the range of the radius of the chamfer is the same as the range of the radius of the chamfer between the second top surface 4011 and the seventh surface 4012.

[0082] In this embodiment, along the direction from the second flange 41 toward the second pole 40 (i.e., along the direction from the third portion 401 toward the fourth portion 402), each of the seventh through twelfth surfaces 4012 through 4017 is inclined toward the center of the second pole 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 mold wear during the manufacturing process of the second pole 40, facilitates material flow, and improves the manufacturing yield of the second pole 40. Furthermore, it reduces material flow resistance during the stamping process of the second pole 40, making the surface layer of the third portion 401 less susceptible to cracking. Exemplarily, the angle between the seventh through twelfth surfaces 4012 through 4017 and the Z-axis is in the range of 0.05° to 5°. For example, the angle between the seventh through twelfth surfaces 4012 through 4017 and the Z-axis is in the range of 1° to 3°.

[0083] In some other embodiments, at least a portion of the first pole 30 and at least a portion of the second pole 40 may also be a polygonal pole structure such as a quadrilateral pole or an octagonal pole, or a round pole, a special-shaped pole, etc. It is understood that the polygonal pole structure may be a regular polygonal pole structure, such as a regular quadrilateral pole or a regular octagonal pole; the polygonal pole structure may also be a non-regular polygonal pole structure, for example, the four corners of a regular quadrilateral pole may be cut off to form an octagonal pole with four short sides and four long sides.

[0084] In other embodiments, one or more flat surfaces can be formed by cutting the cylindrical first and second poles 30, 40 along their height. This prevents the first and second poles 30, 40 from rotating relative to the top cover 10 when mated and connected, thereby improving the torsional strength of the first and second poles 30, 40. For example, by cutting the cylindrical first and second poles 30, 40 along their height to form four centrally symmetrical flat surfaces, the first and second poles 30, 40 can be more torsionally resistant and require fewer processing steps.

[0085] In this embodiment, the first pressure ring 51 is sleeved on the first pole 30 and fixedly connects the first pole 30 and the lower plastic 20. Exemplarily, the inner side wall of the first pressure ring 51 is circular and is used to cooperate with the second part 302 of the first pole 30. The outer periphery of the first pressure ring 51 is roughly pentagonal and one side is a short side. It is understandable that the first pressure ring 51 can be obtained by cutting and removing a corner of a rectangular pressure ring. In this way, when the first pressure ring 51 is connected to the lower plastic 20, the first pressure ring 51 is not easy to rotate relative to the lower plastic 20 and the top cover 10, and the first pole 30 is not easy to rotate relative to the top cover 10, which is beneficial to improve the torsional strength of the first pole 30.

[0086] Exemplarily, the second pressure ring 52 is sleeved on the second pole 40 and fixedly connects the second pole 40 and the lower plastic 20. Exemplarily, the inner sidewall of the second pressure ring 52 is circular and is used to cooperate with the fourth portion 402 of the second pole 40. The outer sidewall of the second pressure ring 52 is roughly pentagonal, and one side is a short side. It is understandable that the second pressure ring 52 can be obtained by cutting a rectangular pressure ring and removing a corner. In this way, when the second pressure ring 52 is connected to the lower plastic 20, the second pressure ring 52 is not easy to rotate relative to the lower plastic 20 and the top cover 10, and thus the second pole 40 is not easy to rotate relative to the top cover 10, which is beneficial to improve the torsional strength of the second pole 40.

[0087] In this embodiment, the end cap assembly 100 further includes a first upper plastic member 61 and a second upper plastic member 62. Both the first upper plastic member 61 and the second upper plastic member 62 are annular. The first upper plastic member 61 is fixedly connected to the top cap 10 and is sleeved over the first portion 301 and the first flange 31 of the first pole 30. In other words, the first pole 30 and the first flange 31 are connected and insulated from the top cap 10 via the first upper plastic member 61. The second upper plastic member 62 is fixedly connected to the top cap 10 and is sleeved over the third portion 401 and the second flange 41 of the second pole 40. In other words, the second pole 40 and the second flange 41 are connected and insulated from the top cap 10 via the second upper plastic member 62.

[0088] Exemplarily, 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 arranged around the through hole of the first main body portion 611 and protrudes from one side surface of the first main body portion 611. The through hole of the first main body portion 611 and the first inner ring portion 612 are both 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 the two 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.

[0089] For example, the through hole of the first main body 611 and the first inner ring portion 612 are regular hexagons, and are used to cooperate with the first pole 30. In the embodiment of the present application, the shape of the through hole of the first main body 611 and the shape of the first inner ring portion 612 can be changed to correspond to the shape of the first pole 30. The through hole of the first main body 611 and the first inner ring portion 612 can be polygonal, circular, or irregularly shaped, and this application does not limit this.

[0090] In this embodiment, the second upper plastic portion 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 arranged around the through hole of the second main body portion 621 and protrudes from a side surface of the second main body portion 621. The through hole of the second main body portion 621 and the second inner ring portion 622 are both 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 the two side surfaces 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.

[0091] Illustratively, the through hole of the second main body 621 and the second inner ring portion 622 are in the shape of a regular hexagon, and are configured to be coupled to the second pole 40. In the embodiment of the present application, the shape of the through hole of the second main body 621 and the shape of the second inner ring portion 622 can be changed to correspond to the shape of the second pole 40. The through hole of the second main body 621 and the second inner ring portion 622 can be in the shape of a polygonal ring, a circular ring, or a special-shaped ring, which is not limited in the present application.

[0092] In this embodiment, the end cap assembly 100 further includes a first seal 71 and a second seal 72. Each of the first seal 71 and the second seal 72 is a hexagonal, annular elastic member made of rubber. The first seal 71 and the second seal 72 are respectively configured to engage with the first terminal 30 and the second terminal 40.

[0093] Please refer to Figures 4, 5, 10 and 11. Figure 10 is a partial structural schematic diagram of the end cover assembly 100 shown in Figure 2 after being cut at an angle, and Figure 11 is a partial enlarged schematic diagram of the end cover assembly 100 shown in Figure 10 at position P.

[0094] In this embodiment, the lower plastic 20 is stacked and connected to the top cover 10. The length of the lower plastic 20 is equivalent to the length of the top cover 10, and the width of the lower plastic 20 is equivalent to the width of the top cover 10, wherein a certain tolerance range is 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 fits the back surface 112 of the top cover body 11. Along the thickness direction (Z-axis direction) of the top cover 10, the first pole through hole 22 of the lower plastic 20 is opposite to the first through hole 12 of the top cover 10 and is connected to each other, and the second pole through hole 23 is opposite to the second through hole 13 of the top cover 10 and is connected to each other.

[0095] Exemplarily, 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 retain each other 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 retain each other to achieve mutual positioning. In Figures 10 and 11, dotted lines are used to schematically distinguish between the lower plastic body 21, the first retaining protrusion 221A, and the first protrusion 222. The first reinforcement 122 is in contact with and connected to the first retaining protrusion 221A and the first protrusion 222. In Figures 10 and 11, dotted lines are used to schematically distinguish between the top cover body 11 and the first reinforcement 122. At this time, the first protrusion 123 of the top cover 10 is located in the first avoidance groove 223 of the lower plastic 20, and the first receiving groove 221 is at least partially located in the first installation groove 121. In Figures 10 and 11, dotted lines are used to schematically distinguish the top cover body 11 and the first protrusion 123.

[0096] Exemplarily, the first pole 30 is disposed through the first pole through-hole 22 and the first through-hole 12. Specifically, the first portion 301 is disposed through the first through-hole 12 and the first pole through-hole 22. The first pressure ring 51 is sleeved over the second portion 302 of the first pole 30 and fixedly connected thereto. The first pressure ring 51 is received within the first receiving groove 221 of the lower plastic 20 and fixedly connected to the wall of the first receiving groove 221. Compared to a solution in which the first pole 30 is cylindrical, in this application, by configuring at least a portion of the first pole 30 as a hexagonal column (or other polygonal column), and configuring the first through-hole 12 and the first pole through-hole 22 to correspond to the shape of the first pole 30, the first pole 30 is less likely to rotate relative to the top cover 10 when mated and connected to the top cover 10. This improves the torsional strength of the first pole 30 and helps prevent the portion of the lower plastic 20 located between the first pressure ring 51 and the top cover body 11 from being cut.

[0097] Exemplarily, 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 terminal 30. In a direction perpendicular to the thickness of the end cap assembly 100 (i.e., in the X-axis and Y-axis directions), the projection of the first pressure ring 51 on the lower plastic body 20 overlaps the projection of the first protrusion 123 on the lower plastic body 20. It is understood that, in a direction perpendicular to the thickness of the end cap assembly 100 (i.e., in the X-axis and Y-axis directions), the partial projection of the first pressure ring 51 on the lower plastic body 20 overlaps with the projection of the first protrusion 123 on the lower plastic body 20, and the partial projection of the first pressure ring 51 on the lower plastic body 20 overlaps with the partial projection of the sidewall of the first sub-mounting groove 1211 on the lower plastic body 20. In this embodiment of the present application, the first protrusion 123 surrounds the first mounting groove 121, increasing the height of the sidewall of the first mounting groove 121, thereby increasing the area of ​​the sidewall of the first mounting groove 121. When the first pressure ring 51 is accommodated in the first mounting groove 121, the overlapping area between 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 30 are not easily rotated relative to the top cover 10, which is beneficial to improving the torsional strength of the first pole 30 and preventing the first protrusion 222, the first holding protrusion 221A and a part of the lower plastic body 21 of the lower plastic 20 located between the first pressure ring 51 and the top cover body 11 from being cut.

[0098] In this embodiment, the second retaining protrusion 231A of the lower plastic 20 is inserted into the third sub-mounting groove 1311. The second retaining protrusion 231A and the second sub-mounting groove 1212 can be mutually retained and positioned. The second protrusion 232 of the lower plastic 20 is inserted into the fourth sub-mounting groove 1312. The second protrusion 232 and the fourth sub-mounting groove 1312 can be mutually retained and positioned. The second reinforcement 132 contacts and connects the second retaining protrusion 231A and the second protrusion 232. At this point, the second protrusion 133 of the top cover 10 is located within the second avoidance groove 233 of the lower plastic 20, and the second receiving groove 231 is at least partially located within the second mounting groove 131.

[0099] Exemplarily, the second pole 40 is disposed through the second pole through-hole 23 and the second through-hole 13. Specifically, the first portion 301 is disposed through the first through-hole 12 and the second pole through-hole 23. The second pressure ring 52 is sleeved on the fourth portion 402 of the second pole 40 and fixedly connected thereto. The second pressure ring 52 is received in the second receiving groove 231 of the lower plastic 20 and fixedly connected to the groove wall of the second receiving groove 231. Compared to the solution in which the second pole 40 is cylindrical, in this application, by configuring at least a portion of the second pole 40 as a hexagonal column (or other polygonal column), and configuring the second through-hole 13 and the second pole through-hole 23 to correspond to the shape of the second pole 40, the second pole 40 is not easily rotated relative to the top cover 10 when mated and connected to the top cover 10, thereby improving the torsional strength of the second pole 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.

[0100] Exemplarily, 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 40. In a 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 pressure ring 52 on the lower plastic 20 covers the projection of the second protrusion 133 on the lower plastic 20. It will be understood that, in a direction perpendicular to the thickness direction of the end cover assembly 100 (i.e., in the X-axis and Y-axis directions), the partial projection of the second pressure ring 52 on the lower plastic 20 overlaps with the projection of the second protrusion 133 on the lower plastic 20, and the partial projection of the second pressure ring 52 on the lower plastic 20 overlaps with the partial projection of the sidewall of the third sub-mounting groove 1311 on the lower plastic 20.

[0101] In the embodiment of the present application, 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 between the top cover 10 and the second pressure ring 52 in a 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 40 are not easily rotated relative to the top cover 10, which is beneficial to improving the torsional strength of the second pole 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.

[0102] In this embodiment, the first upper plastic member 61 is sleeved around the periphery of the first terminal 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 member 61 surrounds the first terminal 30 and is clamped between the first through hole 12 and the first terminal 30. The first outer ring portion 613 of the first upper plastic member 61 is sleeved around the first flange 31, which is connected to both the first outer ring portion 613 and the first main body 611.

[0103] 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 portion 613, the first main body 611, and the first inner ring portion 612. In Figures 10 and 11, dotted lines are used to schematically distinguish the top cover body 11 and the first boss 124. In this embodiment of the present application, by providing 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 30 and the top cover 10, which is beneficial to prevent the first pole 30 from twisting relative to the top cover 10, thereby reducing the cutting of the lower plastic 20. In addition, in the length direction of the top cover 10 (i.e., the X-axis direction), by setting the second sub-mounting groove 1212, the distance from the groove side wall of the second sub-mounting groove 1212 to the hole wall of the first through hole 12 is smaller than the distance from the groove side wall of the first sub-mounting groove 1211 to the hole wall of the first through hole 12, that is, by setting the first reinforcement portion 122, the distance from the groove side wall of the first mounting groove 121 to the hole wall of the first through hole 12 can be reduced, shortening the force arm, so that the top cover 10 can withstand greater external force at the first mounting groove 121, which is beneficial to improving the structural strength of the top cover 10.

[0104] In this embodiment, the second upper plastic member 62 is sleeved around the periphery of the second pole 40 and the periphery of the second pressure ring 52 and is connected to the front face 111 of the top cover body 11. Exemplarily, the second inner ring portion 622 of the second upper plastic member 62 surrounds the second pole 40 and is clamped between the second through hole 13 and the second pole 40. The second outer ring portion 623 of the second upper plastic member 62 is sleeved around the second flange 41, and the second flange 41 is connected to the second outer ring portion 623 and the second main body portion 621. In FIG10 , dotted lines are used to schematically distinguish the first main body portion 611, the first inner ring portion 612, and the first outer ring portion 613.

[0105] In this embodiment, the second boss 134 of the top cover body 11 is located within the second retaining groove 624 of the second upper plastic 62. The second boss 134 is connected to the second outer ring portion 623, the second main body 621, and the second inner ring portion 622. In this embodiment, by providing the second boss 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 40 and the top cover 10, which helps prevent the second pole 40 from twisting relative to the top cover 10, thereby reducing cutting of the lower plastic 20. In addition, in the length direction of the top cover 10 (i.e., the X-axis direction), by setting the fourth sub-mounting groove 1312, the distance from the groove side wall of the fourth sub-mounting groove 1312 to the hole wall of the second through hole 13 is smaller than the distance from the groove side wall of the third sub-mounting groove 1311 to the hole wall of the second through hole 13, that is, by setting the second reinforcement portion 132, the force 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.

[0106] 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 30, the second pole 40 and the top cover 10 are assembled. That is, during the formation process, the above-mentioned position and connection relationship is established with the first pole 30, the second pole 40 and the top cover 10 and the lower plastic 20; for example, the first inner ring portion 612 of the first upper plastic 61 is directly formed between the first through hole 12 and the first pole 30, and is clamped between the first through hole 12 and the first pole 30; the first main body portion 611 of the first upper plastic 61 is directly formed between the first flange 31 and the first boss 124, and is clamped between the first flange 31 and the first boss 124. The second inner ring portion 622 of the second upper plastic member 62 is directly formed between the second through hole 13 and the second pole 40 and is clamped between the second through hole 13 and the second pole 40 . The second main body portion 621 of the second upper plastic member 62 is directly formed between the second flange 41 and the second boss 134 and is clamped between the second flange 41 and the second boss 134 .

[0107] Exemplarily, the first seal 71 is located within the first terminal through-hole 22 and is sleeved onto the first inner ring portion 612 of the first upper plastic member 61. That is, the first seal 71 is sleeved onto the first terminal 30 and 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 is understood that the first seal 71 is compressed between the first pressure ring 51, the top cover body 11, and the first upper plastic member 61, and seals the first terminal through-hole 22.

[0108] Exemplarily, the second seal 72 is located within the second pole through-hole 23 and is sleeved onto the second inner ring portion 622 of the second upper plastic member 62. That is, the second seal 72 is sleeved onto the second pole 40 and 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 will be understood that the second seal 72 is compressed between the second pressure ring 52, the top cover body 11, and the second upper plastic member 62, thereby sealing the second pole through-hole 23.

[0109] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An end cap assembly, characterized in that: It includes a top cover, a lower plastic, a first pole and a 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 surface and a back surface opposite to the front surface. The first protrusion is protruding from the back surface. 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 facing away from the top cover body toward the top cover body. The first through hole passes through the bottom wall of the first mounting groove and the front surface. 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, and the first receiving groove is formed by the second surface being recessed toward the first surface. The lower plastic is located on the side of the back side facing away from the front side, and is stacked and connected to the top cover. The first receiving groove is at least partially located in the first mounting groove, and the first pole is passed through the first through hole. The first pressure ring is sleeved on the first pole and fixedly connected to the first pole. 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.

2. The end cap assembly according to claim 1, wherein: The first protrusion has a first plane and a first inclined surface connected to each other, the first plane is connected to the groove side wall of the first installation groove, and the first inclined surface is connected to the back surface; From the front surface to the back surface, 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, wherein: In the thickness direction of the top cover, a height H1 of the first protrusion is in the range of 0.05-0.3 mm.

4. The end cap assembly according to any one of claims 1 to 3, characterized in that: The top cover further includes a first reinforcement portion, which is protruding from the bottom wall of the first mounting slot. The first reinforcement portion surrounds the first through hole and is connected to the side wall of the first mounting slot.

5. The end cap assembly according to claim 4, wherein: In the thickness direction of the top cover, a height H2 of the first reinforcement portion is in the range of 0.1 to 0.5 mm.

6. The end cap assembly according to claim 4, wherein: The first reinforcement portion has a third plane and a first step surface connected to each other, the third plane is located on a side of the first reinforcement portion facing away from the bottom wall of the first mounting groove and connected to the side wall of the first mounting groove, and the first step surface is connected to the bottom wall of the first mounting groove; A chamfer R11 is formed at a connection between the first step surface and the third plane, and a chamfer R21 is formed at a connection between the first step surface and the bottom wall of the first mounting groove.

7. The end cap assembly according to claim 6, wherein: The radius of the chamfer R11 and the radius of the chamfer R21 are both within the range of 0.05-3 mm.

8. The end cap assembly according to any one of claims 1 to 3, characterized in that: The top cover further includes a first boss, the first boss is protruding from the front surface, and the first through hole also passes through the first boss; The first boss has a first peripheral side surface, and in a direction from the back surface to the front surface, 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, wherein: An included angle between the first peripheral side surface and the thickness direction of the top cover is in a range of 5° to 60°.

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

11. The end cap assembly according to claim 10, wherein: The first pole includes a first part and a second part, the second part is connected to a side surface of the first part, the first part is passed through the first through hole, the first part is a hexagonal column, and the second part is connected to the first pressure ring.

12. The end cap assembly according to claim 11, wherein: The first portion includes a first top surface facing the second portion and connected to the second portion, and the first portion also includes a first surface, a second surface, a third surface, a fourth surface, a fifth surface, and a sixth surface connected in sequence, wherein 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; A chamfer R01 is formed at a connection between the first surface and the second surface, and a radius of the chamfer R01 is in a range of 0.5 mm to 5.0 mm.

13. The end cap assembly according to claim 12, wherein: A chamfer R02 is formed at a connection between the first top surface and the first surface, and a radius of the chamfer R02 is in a range of 0.1 mm to 1 mm.

14. The end cap assembly according to claim 12 or 13, wherein: Along the direction from the first portion to the second portion, the first surface is inclined toward the center of the first pole.

15. The end cap assembly according to claim 14, wherein: An included angle between the first surface and the top cover in a thickness direction is in a 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 further includes a first avoidance groove, which is formed by the first surface being recessed toward the second surface, and the first avoidance groove is arranged corresponding to 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 holding protrusion on the first surface, and the lower plastic further includes a first protrusion, which is protruded from a side surface of the first holding protrusion facing away from the first surface; The first mounting groove includes a first sub-mounting groove and a second sub-mounting groove arranged along the thickness direction of the top cover and connected to each other, the first holding 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: The invention comprises a housing and an end cover assembly according to any one of claims 1 to 17, wherein the end cover assembly is mounted on the housing and seals an opening of the housing.

19. An electrical device, characterized in that: The energy storage device according to claim 18 is used to store electrical energy.

Images