Terminal post assembly, energy storage device and electric device

Abstract

Disclosed in the present application are a terminal post assembly, an energy storage device and an electric device. The terminal post assembly comprises a first terminal post and a first flange connected to one end of the first terminal post. The first terminal post comprises a first member and a second member, which are stacked and connected to each other, wherein the second member is connected to the first flange. The material of the first member is different from that of the second member, and a connection interface between the first member and the second member is a curved surface. The first terminal post is configured to be connected to an electrode assembly of an energy storage device, and the first flange is configured to be connected to a first busbar.

Description

Pole assemblies, energy storage devices 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 2024103619110 and application name “Pole 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 a pole assembly, an energy storage device, and an electrical device. 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] One end of a battery's terminal is connected to a flange, while the other end is used to connect to the electrode assembly inside the battery. However, the current terminal structure is prone to concentrated heat generation, which affects the reliability of the terminal. Summary of the Invention

[0005] The present application provides a pole assembly that generates heat evenly during operation and is less likely to experience concentrated heating problems.

[0006] The pole assembly includes a first pole and a first flange connected to one end of the first pole; the first pole includes a first component and a second component that are stacked and connected, and the second component is connected to the first flange; the material of the first component and the material of the second component are different, and the connection interface between the first component and the second component is a curved surface; the first pole is used to connect the electrode assembly of the energy storage device, and the first flange is used to connect the first busbar.

[0007] It is understood that in the embodiment of the present application, the connection interface between the first component and the second component of the first pole is a wavy interface, so that when the first pole is in operation, the connection interface between the first component and the second component can generate heat evenly, thereby avoiding the problem of concentrated heating at the connection interface caused by the different materials of the first component and the second component. In addition, compared to the solution in which the connection interface between the first component and the second component is a flat surface, the contact surface between the first component and the second component in the embodiment of the present application is a curved surface, the contact area between the first component and the second component is larger, and the conductivity between the first component and the second component is better (that is, the contact area between the copper layer and the aluminum layer is larger, and the conductivity between the copper layer and the aluminum layer is better), thereby improving the reliability of the energy storage device.

[0008] The present application also provides an energy storage device, the energy storage device comprising a housing and an end cover assembly, wherein the end cover assembly is mounted on the housing and seals an opening of the housing;

[0009] The end cover assembly includes a top cover, a lower plastic, and the pole assembly as described above; the top cover has a first through hole, the lower plastic has a first pole through hole, the lower plastic is located on one side of the top cover, and is stacked and connected to the top cover, the first pole through hole is arranged opposite to the first through hole, and the first pole is passed through the first through hole and the first pole through hole; the shape of the first through hole and the shape of the first pole through hole match the shape of the first part of the first pole.

[0010] It can be understood that the first part is used to penetrate the first through hole and the first pole through hole and to be connected with the top cover. Compared with the solution in which the pole is cylindrical, in this application, the first pole is set to a polygonal column, and the shape of the first through hole and the shape of the first pole through hole are also set to a shape corresponding to the first pole. When the first pole is connected with the top cover, the first pole is not easy to rotate relative to the top cover, which improves the torsional strength of the first pole and helps prevent the part of the lower plastic located between the first pole and the top cover body from being cut.

[0011] 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.

[0012] The present application also provides a method for manufacturing a first pole of a pole assembly, wherein the pole assembly includes a first pole, the first pole including a first component and a second component that are stacked and connected, the first component and the second component being made of different materials, and the connection interface between the first component and the second component being a curved surface;

[0013] The preparation method includes:

[0014] S100 performs blanking on the copper-aluminum composite plate to form a first blank;

[0015] S200: After S100, stamping the first blank to form a second blank; wherein the second blank includes the first component;

[0016] S300 , after S200 , punches the second blank to form a third blank; wherein the third blank includes a first component and a second component.

[0017] The manufacturing method is simple in process and high in yield. The first pole manufactured by the manufacturing method uses less copper, has low cost, and is light in weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 paying any creative work.

[0019] FIG1 is a diagram illustrating an application scenario of an energy storage device provided in an embodiment of the present application;

[0020] FIG2 is a schematic diagram of the three-dimensional structure of the energy storage device shown in FIG1 ;

[0021] FIG3 is a schematic structural diagram of the end cover assembly shown in FIG2 ;

[0022] FIG4 is a partial structural exploded schematic diagram of the end cap assembly shown in FIG3 ;

[0023] FIG5 is a partial exploded schematic diagram of the end cap assembly shown in FIG3 from another angle;

[0024] FIG6A is a schematic structural diagram of the first pole and the first flange shown in FIG4 ;

[0025] FIG6B is a schematic diagram of a partial structure of the first pole and the first flange shown in FIG6A cut at an angle;

[0026] FIG7A is a schematic structural diagram of the second pole and the second flange shown in FIG4 ;

[0027] FIG7B is a schematic diagram of a partial structure of the second pole and the second flange shown in FIG7A after being cut at an angle;

[0028] FIG8 is a partial enlarged view of the end cover assembly shown in FIG4 at position M;

[0029] FIG9 is a schematic diagram of a partial structure of the end cap assembly shown in FIG2 after being cut away at an angle;

[0030] FIG10 is a schematic diagram of the manufacturing steps of the first pole and the first flange shown in FIG6A in some embodiments;

[0031] FIG11 is a diagram illustrating a manufacturing process of the first pole and the first flange shown in FIG6A in some embodiments;

[0032] FIG12 is a schematic diagram of the first pole and the first flange shown in FIG11 in one state during the manufacturing process;

[0033] FIG13 is a schematic diagram of the first pole and the first flange shown in FIG11 in another state during the manufacturing process;

[0034] FIG. 14 is a schematic diagram of the first pole and the first flange shown in FIG. 11 in another state during the manufacturing process.

[0035] 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, 124 first boss, 1241 first boss top surface, 1242 first peripheral side, 13 second through hole, 131 second mounting groove, 134 second boss, 1341 second boss top surface, 1342 second peripheral side, 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, 22 first pole through hole, 221 first receiving groove, 221A first holding protrusion, 23 second pole through hole, 231 second receiving groove, 2 31A second holding protrusion, 30 first pole, 301 first part, 3011 first top surface, 3012 first side surface, 33 first component, 34 second component, 302 second part, 31 first flange, 40 second pole, 401 third part, 4011 second top surface, 4012 second side 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 portion, 613 first outer ring portion, 614 first limiting groove, 62 second upper plastic, 621 second main body, 622 second inner ring portion, 623 second outer ring portion, 624 second limiting groove, 71 first seal, 72 second seal, 30a first blank, 30b second blank, 30c third blank, 31a third part, 33a copper layer, 34a aluminum layer. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] The embodiment of the present application is described by taking the energy storage device 1000 as a multi-core battery as an example.

[0040] 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 .

[0041] 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.

[0042] 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.

[0043] 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.

[0044] In the embodiment of the present application, the first pole 30 is a negative pole and the first flange 31 is a negative flange. The first pole 30 is a composite pole, and the first pole 30 and the first flange 31 together constitute a pole assembly. It is understandable that the composite pole includes at least two different materials. The composite pole can be formed by a stamping process using a composite plate containing at least two different materials, or by injection molding using at least two different materials. The present application does not limit the structure and molding process of the composite pole. The second pole 40 can be a composite pole, or it can contain only one material.

[0045] 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, that is, the first through hole 12 and the second through hole 13 both pass through 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.

[0046] 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.

[0047] 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.

[0048] 5 , 6A and 6B , FIG. 6A is a schematic structural diagram of the first pole 30 and the first flange 31 shown in FIG. 4 , and FIG. 6B is a schematic structural diagram of a portion of the first pole 30 and the first flange 31 shown in FIG. 6A after being cut at an angle.

[0049] In this embodiment, the first pole 30 is at least partially hexagonal. It is understood that the first pole 30 may be partially or entirely hexagonal. Exemplarily, the first pole 30 includes a first portion 301 and a second portion 302. FIG6B uses dashed lines 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 and second portions 301, 302 are coaxially arranged. The first portion 301 is a hexagonal. For example, the first portion 301 may be a regular hexagonal pole, with the first portion 301 being centrosymmetrical with respect to the central axis O1-O1 of the first pole 30. The second portion 302 is a cylinder. In the height direction of the first pole 30 (i.e., the Z-axis), 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 achieve high 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. In some examples, the second portion 302 can be electrically connected to the electrode assembly of the energy storage device 1000 via a connecting piece.

[0050] In this embodiment, the first flange 31 is a cylinder. The first flange 31 is used to connect to the first busbar. The first busbar can be a negative busbar. 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 can be located in the middle of the first flange 31. The first pole 30 and the first flange 31 are integrally formed structural parts. The first pole 30 and the first flange 31 can be formed using a stamping process. In this way, the electrical conductivity between the first pole 30 and the first flange 31 is better and it is not easy to cause concentrated heat problems, and the molding process of the first pole 30 and the first flange 31 is relatively simple and low cost.

[0051] In some embodiments, the first electrode 30 includes a stacked and connected first member 33 and a second member 34. Exemplarily, the first member 33 and the second member 34 are arranged along the thickness direction (Z-axis direction) of the first electrode 30. The first member 33 is used to connect to the electrode assembly of the energy storage device 1000. The second member 34 is connected to the first flange 31 on a side facing away from the first member 33. The second member 34 and the first flange 31 are integrally formed structural components.

[0052] Exemplarily, the first portion 301 of the first electrode 30 is composed of a portion of the first component 33 and a portion of the second component 34. That is, the first portion 301 includes a portion of the first component 33 and a portion of the second component 34. The second portion 302 of the first electrode 30 can be composed of another portion of the first component 33 and a portion of the second component 34. That is, the second portion 302 includes another portion of the first component 33 and another portion of the second component 34. The portion of the first component 33 in the second portion 302 is used to connect the electrode assembly of the energy storage device 1000. Of course, in other embodiments, the first portion 301 is composed of a portion of the first component 33 and all of the second component 34. That is, the first portion 301 includes a portion of the first component 33 and all of the second component 34. The second portion 302 of the first electrode 30 can also be formed solely of the first component 33, that is, the second portion 302 includes only another portion of the first component 33.

[0053] In the embodiment of the present application, the material of the first component 33 is different from the material of the second component 34 . The material of the second component 34 is the same as the material of the first flange 31 .

[0054] Exemplarily, the material of the first component 33 is copper. It is understood that the connecting piece used to electrically connect the electrode assembly and the first pole 30 in the energy storage device 1000 is generally made of copper. When the portion of the first component 33 in the second portion 302 is connected to the electrode assembly of the energy storage device 1000 via the connecting piece, because both the first component 33 and the connecting piece are made of copper, the laser welding between the first pole 30 and the connecting piece is more reliable, and the first pole 30 is not easily detached from the connecting piece. This ensures electrical conductivity between the first pole 30 and the electrode assembly within the energy storage device 1000, which helps improve the reliability of the energy storage device 1000.

[0055] In the present application, the material of the first member 33 is the same as the material of the connecting piece used to connect the electrode assembly and the second portion 302 within the energy storage device 1000. Therefore, when the material of the connecting piece is changed (for example, using a metal material other than copper), the material of the first member 33 can be changed accordingly.

[0056] In the embodiment of the present application, the second component 34 and the first flange 31 are both made of aluminum. It is understood that to reduce costs, the first busbar of the battery is generally made of aluminum. When the first flange 31 is connected to the first busbar, since both the first flange 31 and the first busbar are made of aluminum, the laser welding between the first flange 31 and the first busbar is reliable, and the first flange 31 is not likely to fall off the first busbar. This ensures electrical conductivity between the first pole 30 and the first busbar, which is beneficial for improving the reliability of the energy storage device 1000.

[0057] In this application, the material of the second component 34 and the material of the first flange 31 are the same as the material of the first busbar. Therefore, when the material of the first busbar is changed (for example, using a metal material other than aluminum), the material of the second component 34 and the material of the first flange 31 can be changed accordingly.

[0058] It will be appreciated that in the embodiment of the present application, the copper layer extends from the second portion 302 to the first portion 301. In this case, the copper area of ​​the first pole 30 is larger, and the first pole 30 has better electrical conductivity. Furthermore, because copper heats slower than aluminum, increasing the copper area of ​​the first pole 30 and reducing the aluminum area prevents the first pole 30 from heating easily, which helps improve the reliability of the energy storage device 1000.

[0059] In this embodiment, the connection interface between the first component 33 and the second component 34 is a curved surface. It is understandable that the present application sets the connection interface between the first component 33 and the second component 34 as a wavy interface, so that when the first pole 30 is working, the connection interface between the first component 33 and the second component 34 can generate heat evenly, thereby avoiding the problem of concentrated heating of the connection interface caused by the different materials of the first component 33 and the second component 34. In addition, compared with the solution in which the connection interface between the first component 33 and the second component 34 is a plane, the contact surface between the first component 33 and the second component 34 in the embodiment of the present application is a curved surface, the contact area between the first component 33 and the second component 34 is larger, and the conductivity between the first component 33 and the second component 34 is better (that is, the contact area between the copper layer and the aluminum layer is larger, and the conductivity between the copper layer and the aluminum layer is better), so that the reliability of the energy storage device 1000 is better.

[0060] In this embodiment, 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 six first side surfaces 3012 connected in sequence, each of which is connected to the first top surface 3011. The six first side surfaces 3012 are centrally symmetrically distributed about the central axis O1-O1 of the first pole 30.

[0061] The first top surface 3011 is a side surface of the first member 33 away from the first flange 31. A portion of each of the six first side surfaces 3012 is located on the first member 33, and another portion of each of the six first side surfaces 3012 is located on the second member 34. In other words, the first member 33 includes a portion of each first side surface 3012 of the first portion 301, and the second member 34 includes another portion of each first side surface 3012 of the first portion 301.

[0062] In the thickness direction (Z-axis direction) of the first pole 30, the length of the first member 33 at the junction of two adjacent first side surfaces 3012 is greater than the length of the first member 33 at each first side surface 3012. In other words, the copper area at the junction of two adjacent first side surfaces 3012 is greater than the copper area of ​​each first side surface 3012. It is understood that because copper heats slower than aluminum, increasing the copper area and reducing the aluminum area at the junction of two adjacent first side surfaces 3012 reduces heat generation at the junction of two adjacent first side surfaces 3012, thereby improving the reliability of the energy storage device 1000.

[0063] In this embodiment, the corners between two adjacent first side surfaces 3012 among the six first side surfaces 3012 are all rounded, that is, there is a smooth transition between two adjacent first side surfaces 3012 among the six first side surfaces 3012. In this way, during the manufacturing process of the first pole 30, the wear on the mold can be reduced, and at the same time, it is beneficial to the flow of material and the manufacturing yield of the first pole 30 is improved; in addition, the material flow resistance during the stamping process of the first pole 30 can be reduced, and the first part 301 is not prone to the copper layer breaking, resulting in the formation of an aluminum layer and an aluminum powder copper layer. Exemplarily, the connection between two adjacent first side surfaces 3012 is rounded to form a chamfer R01, that is, there is a smooth transition between two adjacent first side surfaces 3012 among the six first side surfaces 3012. 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.

[0064] In this embodiment, the connection between the first top surface 3011 and the first side surface 3012 is chamfered. Exemplarily, the first top surface 3011 and each of the six first side surfaces 3012 are chamfered, that is, there is a smooth transition between the first top surface 3011 and each first side surface 3012. In this way, the difficulty of the process of the first pole 30 can be reduced, which is conducive to the flow of materials in the process of the first pole 30. Exemplarily, a chamfer R02 is formed at the connection between the first top surface 3011 and the first side surface 3012. The radius of the chamfer R02 is in the range of 0.1mm to 1mm. For example, the radius of the chamfer R02 is in the range of 0.25mm to 0.5mm.

[0065] In this embodiment, the first side surface 3012 is inclined toward the center of the first pole 30 along the direction from the first flange 31 toward the first pole 30 (i.e., along the direction from the first portion 301 toward the second portion 302). Exemplarily, each of the six first side surfaces 3012 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 pole 30, facilitates material flow, and improves the manufacturing yield of the first pole 30. Furthermore, it reduces material flow resistance during the stamping process of the first pole 30 from the second portion 302 toward the first portion 301, making it less likely that the copper layer of the first portion 301 will crack, resulting in an aluminum layer or an aluminum powder-copper layer. Exemplarily, the angle between the first side surface 3012 and the thickness direction of the first pole 30 (i.e., the Z-axis) is in the range of 0.05° to 5°. For example, the angle between the first side surface 3012 and the Z axis is in the range of 1° to 3°.

[0066] Please refer to Figures 5, 7A, and 7B in conjunction. Figure 7A is a schematic diagram of the structure of the second pole 40 and the second flange 41 shown in Figure 4, and Figure 7B is a schematic diagram of the partial structure of the second pole 40 and the second flange 41 shown in Figure 7A after being cut at an angle. In some embodiments, the second pole 40 is at least partially a hexagonal pole. It is understood that the second pole 40 can be partially a hexagonal pole, or the second pole 40 can be entirely a hexagonal pole. Exemplarily, the second pole 40 includes a third portion 401 and a fourth portion 402. In Figure 7B, dotted lines are used to 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 portion 401 and the fourth portion 402 are coaxially arranged. The fourth portion 402 can be electrically connected to the electrode assembly of the energy storage device 1000.

[0067] Among them, the third part 401 is a hexagonal column. For example, the third part 401 can be a regular hexagonal column, and the third part 401 is a centrally symmetrical structure relative to the central axis O2-O2 of the second pole 40. The fourth part 402 is a cylinder. In the height direction of the second pole 40 (that is, the Z-axis direction), the projected area of ​​the fourth part 402 is smaller than the projected area of ​​the third part 401. Among them, the third part 401 is used to penetrate the second through hole 13 and cooperate with the top cover 10 to obtain higher torsional strength, and the fourth part 402 is used to cooperate with the second pressure ring 52. The second part 302 is also used to be electrically connected to the electrode assembly of the energy storage device 1000.

[0068] In this embodiment, the second flange 41 is cylindrical. It is used to connect to the second busbar. The second busbar can be a positive busbar. The second flange 41 is located on the side of the third portion 401 facing away from the fourth portion 402 and connects 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.

[0069] Illustratively, third portion 401 of second pole 40 includes a second top surface 4011 connected to fourth portion 402 and facing toward fourth portion 402. Third portion 401 also includes six second side surfaces 4012 connected in sequence, each of which is connected to second top surface 4011. The six second side surfaces 4012 are centrally symmetrically distributed with respect to a central axis O2-O2 of second pole 40.

[0070] In this embodiment, the corners between adjacent pairs of the six second side surfaces 4012 are rounded, that is, the transition between adjacent pairs of the six second side surfaces 4012 is smooth. 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.

[0071] For example, two adjacent second side surfaces 4012 are rounded to form a chamfer R03, that is, a smooth transition is formed between two adjacent second side surfaces 4012 among the six second side surfaces 4012. 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.

[0072] In this embodiment, the connection between the second top surface 4011 and the second side surface 4012 is rounded, that is, the transition between the second top surface 4011 and the second side surface 4012 is smooth. This can reduce the difficulty of manufacturing the second pole 40 and facilitate material flow during the manufacturing process of the second pole 40. Exemplarily, a chamfer R04 is formed at the connection between the second top surface 4011 and the second side surface 4012. The radius of the chamfer R04 is in the range of 0.1 mm to 1 mm. For example, the radius of the chamfer R04 is in the range of 0.25 mm to 0.5 mm.

[0073] In this embodiment, along the direction from the second flange 41 to the second pole 40 (that is, along the direction from the third part 401 to the fourth part 402), the second side surface 4012 is inclined toward the center of the second pole 40, that is, the area of ​​the second top surface 4011 of the third part 401 is smaller than the area of ​​the surface of the third part 401 facing away from the fourth part 402. In this way, during the manufacturing process of the second pole 40, the wear on the mold can be reduced, while at the same time being beneficial to the flow of material and improving the yield rate of the manufacturing process 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 less likely to crack. Exemplarily, the angle between the second side surface 4012 and the Z axis is in the range of 0.05° to 5°. For example, the angle between the second side surface 4012 and the Z axis is in the range of 1° to 3°.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] Please refer to Figures 4 and 8 in conjunction. Figure 8 is a partial enlarged view of the end cap assembly 100 shown in Figure 4 at position M. In this embodiment, the top cover 10 also 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 direction) and are respectively used to cooperate with the first upper plastic and the second upper plastic. The first boss 124 and the second boss 134 are both protruding from the front face 111 of the top cover body 11. The first through hole 12 passes through the first boss 124. The second through hole 13 passes through the second boss 134.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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 .

[0084] 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.

[0085] Illustratively, the lower plastic body 20 has a first pole through-hole 22, a first receiving groove 221, a second pole 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 pole through-hole 22 extends through the bottom wall of the first receiving groove 221 and the first surface 211. In other words, the first pole through-hole 22 extends through the lower plastic body 21 and the first retaining protrusion 221A. The first pole through-hole 22 can be understood as a pole through-hole.

[0086] 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.

[0087] 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 extends through the first surface 211 and the second surface 212. The second pole through hole 23 extends through the bottom wall of the second receiving groove 231. That is, the second pole through hole 23 extends through the lower plastic body 21 and the second retaining protrusion 231A.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] Please refer to FIG. 4 , FIG. 5 and FIG. 9 . FIG. 9 is a partial structural schematic diagram of the end cover assembly 100 shown in FIG. 2 after being cut at an angle.

[0096] 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.

[0097] Exemplarily, the first holding protrusion 221A of the lower plastic 20 is inserted into the first mounting groove 121, and the first holding protrusion 221A and the first mounting groove 121 can be mutually held to achieve mutual positioning. The first pole 30 is passed through the first pole through hole 22 and the first through hole 12. Specifically, the first part 301 is passed through the first through hole 12 and the first pole through hole 22. The first pressure ring 51 is sleeved on the second part 302 of the first pole 30 and is fixedly connected to the second part 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. In Figure 9, dotted lines are used to schematically distinguish the first part 301, the second part 302 and the first flange 31. Compared to the solution in which the first pole 30 is cylindrical, in the present application, the first pole 30 is set to a hexagonal pole (or other polygonal pole), and the first through hole 12 and the first pole through hole 22 are also set to a shape corresponding to the first pole 30. When the first pole 30 is connected to the top cover 10, the first pole 30 is not easy to rotate relative to the top cover 10, thereby improving the torsional strength of the first pole 30 and preventing the portion of the lower plastic 20 located between the first pole 30 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 second mounting groove 131. The second retaining protrusion 231A and the second mounting groove 131 can be mutually retained to achieve mutual positioning. The second pole 40 is inserted into the second pole through hole 23 and the second through hole 13. Specifically, the third portion 401 is inserted into the second through hole 13 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 to the fourth portion 402. 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 the present application, the second pole 40 is set to a hexagon (or other polygon), and the second through hole 13 and the second pole through hole 23 are also set to a shape corresponding to the second pole 40. When the second pole 40 is connected to the top cover 10, the second pole 40 is not easy to rotate relative 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 pole 40 and the top cover body 11 from being cut.

[0099] 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.

[0100] In this embodiment, the first boss 124 of the top cover body 11 is located within the first limiting groove 614 of the first upper plastic 61. 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 FIG9 , a dotted line is 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 helps prevent the first pole 30 from twisting relative to the top cover 10, thereby reducing the cutting of the lower plastic 20.

[0101] 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, which is connected to the second outer ring portion 623 and the second main body 621. In FIG9 , dotted lines are used to schematically distinguish the second main body 621, the second inner ring portion 622, and the second outer ring portion 623.

[0102] 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.

[0103] 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 .

[0104] 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.

[0105] 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.

[0106] The above primarily describes the structures of the various components of the energy storage device 1000 (including the top cover 10, lower plastic 20, first pole 30, second pole 40, etc.) and the connections between them. Specifically, the first pole 30 and first flange 31 can be formed into an integrally formed structural component through a stamping process. The first pole 30 (also known as a composite pole) includes a first component 33 and a second component 34 made of different materials. The following describes the molding process for the first pole 30 and first flange 31 (also known as the molding process for the pole assembly) in conjunction with the relevant figures.

[0107] Please refer to Figures 10 and 11 in combination. Figure 10 is a schematic diagram of the manufacturing steps of the first pole 30 and the first flange 31 shown in Figure 6A in some embodiments, and Figure 11 is a diagram of the manufacturing process of the first pole 30 and the first flange 31 shown in Figure 6A in some embodiments.

[0108] S100: blanking is performed on the copper-aluminum composite plate to form a first blank 30a.

[0109] In an embodiment of the present application, the first blank 30a includes a copper layer 33a and an aluminum layer 34a arranged and connected along the thickness direction of the blank, and the thickness of the copper layer 33a is less than the thickness of the aluminum layer 34a. The first pole 30 uses less copper, the cost is low, and the weight of the first pole 30 is small. The first blank 30a is a polygonal column. Exemplarily, the first blank 30a is a regular hexagonal column. Compared to the solution in which the first blank 30a is cylindrical, in the present application, the first blank 30a is a regular hexagonal column, which makes the blanking positions on the copper-aluminum composite plate closer to each other, so that the copper-aluminum composite plate can have more blanking positions, and the material utilization rate of the copper-aluminum composite plate can be improved.

[0110] S200: After S100, the first blank 30a is stamped to form the first member 33 of the first pole 30 (or the second portion 302 of the first pole 30) on the first blank 30a. This, in other words, forms the second blank 30b. The manufacturing process for the first member 33 of the first pole 30 (or the second portion 302 of the first pole 30) is simple and has a high process yield. The second portion 302 is schematically demarcated by a dashed line in FIG11 .

[0111] In the embodiment of the present application, under the extrusion of external force, the copper layer of the first blank 30a is crushed and flows in all directions, and the thickness of the first blank 30a is reduced, so that the thickness of the second blank 30b formed after S200 is less than the thickness of the first blank 30a, and the thickness of the copper layer of the second blank 30b is greater than or equal to the thickness of the copper layer of the first blank 30a. In this way, the copper layer of the first pole 30 can extend from the second part 302 to the first part 301, so that the area of ​​the copper layer of the first pole 30 is larger and the conductivity of the first pole 30 is better. In addition, because the heating rate of copper is lower than the heating rate of aluminum, by increasing the area of ​​the copper material of the first pole 30 and reducing the area of ​​the aluminum material, the first pole 30 is not easily heated, which is beneficial to improving the reliability of the energy storage device 1000.

[0112] Exemplarily, the second portion 302 is cylindrical. The outer surface of the second portion 302 is made of copper. Thus, when the second portion 302 is connected to the electrode assembly of the energy storage device 1000 via the connecting tab, since both the second portion 302 and the connecting tab are made of copper, the laser welding between the second portion 302 and the connecting tab is reliable, and the second portion 302 is unlikely to fall off the connecting tab. This ensures electrical conductivity between the first electrode 30 and the electrode assembly within the energy storage device 1000, thereby improving the reliability of the energy storage device 1000.

[0113] S300: After S200, the second blank 30b is stamped to form the second member 34 of the first pole 30 (or the first portion 301 of the first pole 30) and the third portion 31a connected to the second member 34 on the second blank 30b. This forms the third blank 30c. The manufacturing process for the second member 34 of the first pole 30 (or the first portion 301 of the first pole 30) is simple and has a high process yield. In Figure 11, dashed lines schematically distinguish the first portion 301, the second portion 302, and the third portion 31a.

[0114] In the embodiment of the application, after forming the second component 34, the aluminum layer of the second blank 30b is extruded by applying a greater pressure, causing the aluminum layer to collapse and flow in all directions. The thickness of the second blank 30b is reduced, and the first component 33 and the third portion 31a are formed. The pressure used to extrude the second blank 30b is in the range of 30-50 tons, for example, 40 tons.

[0115] Exemplarily, the first pole 30 includes a first component 33 and a second component 34 that are stacked and connected. Exemplarily, the first component 33 and the second component 34 are arranged along the thickness direction (Z-axis direction) of the first pole 30. The material of the first component 33 and the material of the second component 34 are different, and the connection interface between the first component 33 and the second component 34 is a curved surface, so that when the first pole 30 is working, the connection interface between the first component 33 and the second component 34 can generate heat evenly, thereby avoiding the problem of concentrated heating at the connection interface caused by the different materials of the first component 33 and the second component 34. In addition, the contact area between the first component 33 and the second component 34 is large, the contact area between the copper layer and the aluminum layer is large, and the electrical conductivity between the copper layer and the aluminum layer is good, so that the reliability of the energy storage device 1000 is better.

[0116] S400: After S300, the third blank 30c is cut to form the first pole 30 and the first flange 31. In FIG11, the first portion 301, the second portion 302 and the first flange 31 are schematically distinguished by dashed lines.

[0117] Exemplarily, after forming the first portion 301 and the third portion 31a connected to the first portion 301 on the second blank 30b, the third portion 31a is cut to form a cylindrical shape, thereby forming the first flange 31. It is understood that the first pole 30 and the first flange 31 are formed through at least two stamping processes. Exemplarily, the first pole 30 and the first flange 31 are formed through two stamping processes. The forming process of the first flange 31 is performed after the forming process of the first pole 30. This simplifies the forming process of the first flange 31 and improves the forming yield of the first pole 30 and the first flange 31.

[0118] The material of the first flange 31 is the same as that of the second component 34, and both are aluminum. Therefore, when the first flange 31 is connected to the first busbar, the laser welding between the first flange 31 and the first busbar is highly reliable, as both are aluminum. The first flange 31 is unlikely to fall off the first busbar, thereby ensuring electrical conductivity between the first flange 31 and the first busbar and improving the reliability of the energy storage device 1000.

[0119] In some embodiments, after S400, the first pole 30 and the first flange 31 may be cleaned to remove dust, impurities, and metal chips on the surfaces of the first pole 30 and the first flange 31 to prevent dust, impurities, and metal chips from affecting the conductive properties of the first pole 30 and the first flange 31, thereby affecting the reliability of the energy storage device 1000.

[0120] It is understandable that the method for manufacturing the first pole 30 and the first flange 31 provided in the present application can also be applied to some structures similar to the first pole 30 and the first flange 31, and the present application does not limit this.

[0121] Please refer to Figures 11, 12, and 13. Figure 12 is a schematic diagram of the first pole 30 and first flange 31 shown in Figure 11 during one state of the manufacturing process, and Figure 13 is a schematic diagram of the first pole 30 and first flange 31 shown in Figure 11 during another state of the manufacturing process. For example, Figure 12 illustrates the first blank 30a before cold heading and mold closing, and Figure 13 illustrates the first blank 30a after cold heading and mold closing to form the second blank 30b.

[0122] In an embodiment of the present application, the first pole 30 and the first flange 31 can be formed on a stamping device. Exemplarily, the stamping device includes a punch, a die, a dropout insert, and a spring. The die has a groove of a preset shape. By applying pressure to the blank, the blank material flows to fill the groove of the die. Thus, the punch and die cooperate to stamp the blank into the preset shape. The dropout insert and spring allow the stamped blank to be released from the die.

[0123] In an embodiment of the present application, under the action of an external force, the copper layer 33a of the first blank 30a is crushed and flows around under the cooperation of the punch and the die, forming the second blank 30b. Exemplarily, the thickness of the second blank 30b is less than the thickness of the first blank 30a. The maximum thickness of the copper layer of the first blank 30a is less than or equal to the maximum thickness of the copper layer of the second blank 30b. That is, the copper layer coverage area of ​​the second blank 30b is greater than or equal to the copper layer coverage area of ​​the first blank 30a. In this way, the copper layer of the first pole 30 can extend from the second part 302 to the first part 301, so that the area of ​​the copper layer of the first pole 30 is larger and the conductive performance of the first pole 30 is better. In addition, since the heating rate of copper is lower than the heating rate of aluminum, by increasing the copper area of ​​the first pole 30 and reducing the aluminum area, the first pole 30 is not easily heated, which is beneficial to improving the reliability of the energy storage device 1000.

[0124] Please refer to Figures 11, 13, and 14. Figure 14 is a schematic diagram of another state during the manufacturing process of the first pole 30 and the first flange 31 shown in Figure 11. For example, Figure 14 shows the state where the second blank 30b is formed into the third blank 30c after cold heading and mold closing.

[0125] Exemplarily, after forming the second blank 30b, a relatively high pressure is applied to extrude the aluminum layer of the second blank 30b. The aluminum layer of the second blank 30b, in cooperation with the convex and concave diaphragms, collapses and flows in all directions, forming the third blank 30c. The pressure used to extrude the second blank 30b is within a range of 30-50 tons, for example, 40 tons. Exemplarily, the thickness of the third blank 30c is less than that of the second blank 30b.

[0126] Illustratively, the third blank 30c includes a stacked and connected first component 33 and second component 34. The materials of the first component 33 and the second component 34 are different, and the interface between the first component 33 and the second component 34 is a curved surface. This allows for uniform heat generation at the interface between the first component 33 and the second component 34 during operation of the first electrode 30, thereby avoiding the problem of concentrated heat generation at the interface due to the different materials of the first component 33 and the second component 34. Furthermore, the contact area between the first component 33 and the second component 34 is large, and the contact area between the copper layer and the aluminum layer is large, resulting in good electrical conductivity between the copper layer and the aluminum layer, thereby improving the reliability of the energy storage device 1000.

[0127] 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. A pole assembly, characterized in that: It includes a first pole and a first flange connected to one end of the first pole; The first pole includes a first component and a second component that are stacked and connected, and the second component is connected to the first flange; the first component and the second component are made of different materials, and the connection interface between the first component and the second component is a curved surface; The first pole is used to connect to the electrode assembly of the energy storage device, and the first flange is used to connect to the first busbar.

2. The pole assembly according to claim 1, characterized in that The material of the second component is the same as that of the first flange; the material of the first component includes copper, and the material of the second component includes aluminum.

3. The pole assembly according to claim 1 or 2, characterized in that: The first pole includes a first portion and a second portion, wherein the second portion is connected to a side surface of the first portion; The first portion includes a portion of the first member and at least a portion of the second member, and the second portion includes at least another portion of the first member.

4. The pole assembly according to claim 3, characterized in that The first part is a polygonal column.

5. The pole assembly according to claim 4, characterized in that: The first portion includes a first top surface facing the second portion and connected to the second portion, and the first portion also includes six first side surfaces connected in sequence, each of the six first side surfaces being connected to the first top surface, and the six first side surfaces being centrally symmetrically distributed relative to a central axis of the first pole; The first top surface is a side surface of the first component away from the first flange, a portion of each of the first side surfaces is located on the first component, and another portion of each of the first side surfaces is located on the second component.

6. The pole assembly according to claim 5, characterized in that: In the thickness direction of the first pole, the length of the first component at the connection between two adjacent first side surfaces is greater than the length of the first component at the first side surface.

7. The pole assembly according to claim 5 or 6, characterized in that: A chamfer R01 is formed at a connection point between two adjacent first side surfaces, and a radius of the chamfer R01 is in a range from 0.5 mm to 5.0 mm.

8. The pole assembly according to claim 5 or 6, characterized in that: A chamfer R02 is formed at a connection between the first top surface and the first side surface, and a radius of the chamfer R02 is in a range of 0.1 mm to 1 mm.

9. The pole assembly according to claim 5 or 6, characterized in that: Along a direction from the first portion to the second portion, the first side surface is inclined toward a center of the first pole.

10. The pole assembly according to claim 9, characterized in that An included angle between the first side surface and the thickness direction of the first pole is in a range of 0.05° to 5°.

11. The pole assembly according to claim 1 or 2, characterized in that: The first pole and the first flange are integrally formed structural components.

12. An energy storage device, characterized in that: The invention comprises a shell and an end cover assembly, wherein the end cover assembly is mounted on the shell and seals the opening of the shell; The end cap assembly comprises a top cap, a lower plastic, and a pole assembly as claimed in any one of claims 1 to 11; The top cover has a first through hole, the lower plastic has a first pole through hole, the lower plastic is located on one side of the top cover, and is stacked and connected to the top cover, the first pole through hole is arranged opposite to the first through hole, and the first pole is passed through the first through hole and the first pole through hole; The shape of the first through hole and the shape of the first pole through hole match the shape of the first portion of the first pole.

13. The energy storage device according to claim 12, characterized in that: The top cover includes a top cover body, wherein 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, and the first through hole passes through the front surface and the back surface; 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.

14. The energy storage device according to claim 13, characterized in that 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°.

15. An electrical device, characterized in that: The energy storage device comprises the energy storage device according to any one of claims 12 to 14, wherein the energy storage device is used to store electrical energy.

16. A method for manufacturing a first pole of a pole assembly, wherein the pole assembly comprises a first pole, characterized in that: The first pole includes a first component and a second component that are stacked and connected, the first component and the second component are made of different materials, and the connection interface between the first component and the second component is a curved surface; The production method comprises: S100 performs blanking on the copper-aluminum composite plate to form a first blank; S200: After S100, stamping the first blank to form a second blank; wherein the second blank includes the first component; S300: After S200, stamping the second blank to form a third blank; wherein the third blank includes the first component and the second component.

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