Composite metal assembly, pole, cover plate assembly, and battery cell

Abstract

The present application relates to the technical field of composite metals, and provides a composite metal assembly, a pole, a cover plate assembly, and a battery cell. The composite metal assembly comprises a first metal member, a second metal member, and a metal connecting member provided between the first metal member and the second metal member; the metal connecting member is configured to connect the first metal member and the second metal member. The first metal member, the second metal member, and the metal connecting member are made of different materials, the metal connecting member comprises a plurality of connecting portions, and the plurality of connecting portions are spaced apart from each other.

Description

A composite metal component, electrode post, cover plate assembly, and battery cell

[0001] This application claims priority to Chinese patent applications filed on April 21, 2025, with application number 202520765895.1, and filed on January 14, 2025, with application numbers 202510059027.6 and 202520085822.8, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of composite metal technology, specifically to a composite metal component and electrode post, cover plate component, and battery cell. Background Technology

[0003] In the context of cost reduction and efficiency improvement, and in certain scenarios where it is necessary to connect metal structures of different materials, the application of composite metals is becoming increasingly widespread. Invention Overview

[0004] In related technologies, when two metals of different materials are combined into a whole, the two metals are in direct contact, thus forming an interface layer at the interface where the two metals are combined. The degree of alloying is high, which can easily lead to low bonding strength and high resistivity, affecting the bonding effect of the two metals and limiting the application scenarios of composite metal components.

[0005] This application provides a composite metal component, including a first metal part, a second metal part, and a metal connector disposed between the first metal part and the second metal part. The metal connector is configured to connect the first metal part and the second metal part. The first metal part, the second metal part, and the metal connector are all made of different materials. The metal connector includes multiple connecting portions configured to connect the first metal part and the second metal part, and the multiple connecting portions are spaced apart.

[0006] This application also provides an electrode post, including the composite metal component described above.

[0007] This application also provides a cover plate assembly, including a cover plate and the aforementioned pole post, the pole post being disposed on the cover plate.

[0008] This application also provides a battery cell, including a housing, an electrode assembly, and the cover assembly described above. The housing has a receiving cavity, the electrode assembly is disposed in the receiving cavity, the electrode assembly includes tabs, the cover assembly is connected to the housing and closes the opening of the receiving cavity, and the terminal post is connected to the tab. Beneficial effects

[0009] The composite metal assembly provided in this application connects a first metal component and a second metal component via a metal connector. The connector's restraining force on the first and second metal components ensures the stability of the connection. The metal connector includes multiple spaced-apart connecting portions, which, while ensuring the connection between the first and second metal components, also reduces over-alloying during the contact bonding process, thereby lowering the resistivity of the composite metal assembly. In other words, the composite metal assembly provided in this application achieves both good connection stability and low resistivity, improving the overall performance of the composite metal assembly and expanding its application scenarios. Attached Figure Description

[0010] Figure 1 is a schematic diagram of the longitudinal section structure of the composite metal component provided in an embodiment of this application;

[0011] Figure 2 is a schematic diagram of the longitudinal section structure of the composite metal component provided in the embodiment of this application;

[0012] Figure 3 is a schematic diagram of the longitudinal section structure of the composite metal component provided in the embodiment of this application;

[0013] Figure 4 is a schematic diagram of the longitudinal section structure of the composite metal component provided in the embodiment of this application;

[0014] Figure 5 is a schematic cross-sectional view of the composite metal component provided in an embodiment of this application;

[0015] Figure 6 is a schematic diagram of the cross-sectional structure of the composite metal component provided in the embodiment of this application;

[0016] Figure 7 is a schematic diagram of the cross-sectional structure of the composite metal component provided in the embodiment of this application;

[0017] Figure 8 is a schematic diagram of the cross-sectional structure of the composite metal component provided in the embodiment of this application;

[0018] Figure 9 is a schematic diagram of the structure of the first type of pole post provided in the embodiment of this application;

[0019] Figure 10 is an enlarged view of point A in Figure 9;

[0020] Figure 11 is an enlarged view of another structure at point A in Figure 9 provided in an embodiment of this application;

[0021] Figure 12 is a schematic diagram of the forging flow line of the first metal column provided in an embodiment of this application;

[0022] Figure 13 is a schematic diagram of the structure of the second type of pole post provided in an embodiment of this application;

[0023] Figure 14 is a schematic diagram of the structure of the second metal layer provided in an embodiment of this application;

[0024] Figure 15 is a schematic diagram of the structure of another second metal layer provided in an embodiment of this application;

[0025] Figure 16 is an enlarged view of point B in Figure 9;

[0026] Figure 17 is an enlarged view of another structure at point B in Figure 9;

[0027] Figure 18 is a schematic diagram of the structure of the third type of pole provided in the embodiment of this application;

[0028] Figure 19 is a schematic diagram of the fourth type of pole provided in the embodiments of this application;

[0029] Figure 20 is a structural schematic diagram of the first cover plate assembly provided in an embodiment of this application;

[0030] Figure 21 is a structural schematic diagram of the second cover plate assembly provided in an embodiment of this application;

[0031] Figure 22 is a structural schematic diagram of the third cover plate assembly provided in the embodiment of this application;

[0032] Figure 23 is a structural schematic diagram of the fourth cover plate assembly provided in the embodiment of this application;

[0033] Figure 24 is a structural schematic diagram of the fifth cover plate assembly provided in the embodiment of this application;

[0034] Figure 25 is a schematic diagram of the structure of the first insulating member provided in an embodiment of this application;

[0035] Figure 26 is a schematic diagram of the structure of a battery cell provided in an embodiment of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 10. First metal component; 11. Composite interface; 14. First segment; 141. Mating bottom wall; 15. Second segment; 16. Fitting groove; 161. First line segment; 162. Second line segment; 163. Third line segment; 164. Fourth line segment; 165. Fifth line segment; 166. Sixth line segment; 18. Forging flow line; 19. Joining area; 191. Tight zone; 1911. First dense zone; 1912. Second dense zone; 1913. Third dense zone;

[0038] 20. Second metal part; 27. Cylinder body; 271. Mating groove; 272. Step groove b; 273. Pre-punched hole; 28. Flanged edge; 281. Transition section; 29. ​​Clearance a;

[0039] 30. Metal connector; 31. Connecting part; 311. First connecting part; 312. Second connecting part; 32. Gap;

[0040] 101. Pole post; 1013. First surface; 1015. First region; 1016. Second region; 1017. First protrusion; 1018. Second protrusion; 1019. Base plate;

[0041] 100. Cover plate assembly; 110. Cover plate; 112. First insulating element; 1121. Exhaust channel; 113. Second insulating element; 120. Current collector; 121. Protrusion; 130. Sealing element;

[0042] 1000, battery cell; 1100, casing. Embodiments of the present invention

[0043] Firstly, as shown in Figures 1-3, embodiments of this application provide a composite metal component including a first metal part 10, a second metal part 20, and a metal connector 30 disposed between the first metal part 10 and the second metal part 20. The metal connector 30 is configured to connect the first metal part 10 and the second metal part 20. The first metal part 10, the second metal part 20, and the metal connector 30 are all made of different materials. The metal connector 30 includes multiple connecting portions 31, which are configured to connect the first metal part 10 and the second metal part 20, and the multiple connecting portions 31 are spaced apart. By connecting the first metal part 10 and the second metal part 20 with the metal connector 30, the connection stability between the first metal part 10 and the second metal part 20 can be ensured by utilizing the restraining force of the metal connector 30 on the first metal part 10 and the second metal part 20. The metal connector 30, including multiple spaced connecting portions 31, can reduce the resistivity of the composite metal component while ensuring the connection between the first metal part 10 and the second metal part 20. In other words, the composite metal components provided in this application embodiment can balance good connection stability and low resistivity, thereby improving the overall performance of composite metal components and expanding their application scenarios.

[0044] Understandably, when the first metal component 10 and the second metal component 20 are connected by the metal connector 30, the metal connector 30 can generate tensile and shear stresses with the first metal component 10 and the second metal component 20 located on both sides thereon. That is, the metal connector 30 can restrain the first metal component 10 and the second metal component 20, rather than simply physically bonding them together, thus ensuring the connection effect. Furthermore, during the shaping process of the composite metal component, the metal connector 30 can also form fine fragments, creating a pinning effect with the first metal component 10 and the second metal component 20, thereby enhancing the connection strength between the metal connector 30 and the first metal component 10 and the second metal component 20. Since the metal connector 30 and the first metal component 10 and the second metal component 20 can be connected through restraint and pinning effects, compared to simple physical bonding, the resistivity of the composite metal component can also be reduced.

[0045] The composite metal assembly provided in this application provides a metal composite material disposed between a first metal component 10 and a second metal component 20, and connected by a metal connector 30. This fully utilizes the restraining force of the metal connector 30 on the first metal component 10 and the second metal component 20, ensuring the connection stability between the first metal component 10 and the second metal component 20, and guaranteeing the overall mechanical performance of the composite metal assembly. Furthermore, since the metal connector 30 includes multiple spaced-apart connecting portions 31, it can reduce the phenomenon of high resistivity. Therefore, the composite metal assembly provided in this application can balance good mechanical stability and low electrical conductivity, improving the overall performance of the composite metal assembly. Especially when the composite metal component is applied to electronic devices as an electrical connector, it can reduce costs while maintaining both mechanical performance and high electrical conductivity.

[0046] For example, the metal connector 30 may simultaneously include the first metal element from the first metal component 10 and the second metal element from the second metal component 20. The metal connector 30 forms a tight structure similar to metallurgical bonding through the fusion and interweaving of the metals. Because the metal connector 30 simultaneously contains both the first and second metal elements, the connection stability between the metal composite structure and the first metal component 10 and the second metal component 20 can be improved. The metal connector 30 can act as a bridge, ensuring connection stability through its restraining force on the first metal component 10 and the second metal component 20.

[0047] In some embodiments, the first metal component 10 and the metal connector 30 are an integral structure. By having the first metal component 10 and the metal connector 30 as an integral structure, a high connection strength can be ensured for both. Then, the entire assembly formed by the first metal component 10 and the metal connector 30 is connected to the second metal component 20. The restraining force of the metal connector 30 on the second metal component 20 allows the first metal component 10, the metal connector 30, and the second metal component 20 to form a structurally stable composite metal assembly.

[0048] In some embodiments, the second metal component 20 and the metal connector 30 are an integral structure. Similarly, by making the second metal component 20 and the metal connector 30 an integral structure, it is possible to ensure that the second metal component 20 and the metal connector 30 have high connection strength. Then, the integral structure formed by the second metal component 20 and the metal connector 30 is connected to the first metal component 10, and the restraining force of the metal connector 30 on the first metal component 10 makes the first metal component 10, the metal connector 30, and the second metal component 20 form a structurally stable composite metal assembly.

[0049] In some embodiments, the first metal part 10, the metal connector 30, and the second metal part 20 are an integral structure.

[0050] By forming an integral structure with the first metal part 10, the metal connector 30, and the second metal part 20, the stability of the connection between the three can be guaranteed, thereby ensuring the structural stability of the composite metal component.

[0051] In some embodiments, as shown in FIG4, the first metal part 10 and the second metal part 20 are stacked along a first direction, and the maximum thickness H of the metal connector 30 in the first direction is 0.1 μm - 1 mm.

[0052] By setting the maximum thickness of the metal connector 30 within the aforementioned range in the first direction, it is possible to ensure that the metal connector 30 has a good restraining force on the first metal component 10 and the second metal component 20, thereby ensuring connection stability and structural strength. Simultaneously, it also ensures that the resistivity of the composite metal assembly is within a reasonable range.

[0053] In some embodiments, the maximum thickness H of the metal connector 30 in the first direction is 0.1 μm to 10 μm. By setting the maximum thickness of the metal connector 30 in the first direction within the above range, it is possible to ensure that the metal connector 30 has a good restraining force on the first metal component 10 and the second metal component 20, ensuring connection stability and structural strength. Simultaneously, it also ensures that the resistivity of the composite metal assembly is within a reasonable range.

[0054] In some embodiments, as shown in Figures 1-3, a gap 32 is formed between adjacent connecting portions 31, and the first metal member 10 and / or the second metal member 20 extends into the gap 32 so that the first metal member 10 and the second metal member 20 directly contact each other at the gap 32. By extending the first metal member 10 and / or the second metal member 20 into the gap 32, the contact area between the first metal member 10 and the second metal member 20 can be increased, thereby improving the electrical contact performance between the first metal member 10 and the second metal member 20. Specifically, at the location with the connecting portion 31, the first metal member 10 achieves electrical contact with the second metal member 20 through the connecting portion 31, while at the gap 32 between adjacent connecting portions 31, the first metal member 10 and / or the second metal member 20 extend into the gap 32, enabling direct contact between the first metal member 10 and the second metal member 20, thus increasing the contact area and reducing the resistivity of the composite technology component.

[0055] For example, only the first metal member 10 may extend into the gap 32 (as shown in FIG. 2), and the first metal member 10 within the gap 32 may directly contact the second metal member 20. Alternatively, only the second metal member 20 may extend into the gap 32 (as shown in FIG. 1), and the second metal member 20 within the gap 32 may directly contact the first metal member 10. Alternatively, both the first metal member 10 and the second metal member 20 may extend into the gap 32 (as shown in FIG. 3), and the first metal member 10 and the second metal member 20 may directly contact each other within the gap 32.

[0056] In some embodiments, the minimum spacing between adjacent connecting portions 31 is 1 μm to 100 μm. By setting the minimum spacing between adjacent connecting portions 31 within the above range, it is possible to ensure that the metal connector 30 has a good restraining force on the first metal member 10 and the second metal member 20, ensuring connection stability and structural strength. Simultaneously, it also ensures that the resistivity of the composite metal assembly is within a reasonable range.

[0057] In some embodiments, the minimum spacing between adjacent connecting portions 31 is 10μm-50μm. By setting the minimum spacing between adjacent connecting portions 31 within the above range, it is possible to ensure that the metal connector 30 has a good restraining force on the first metal member 10 and the second metal member 20, ensuring connection stability and structural strength. Simultaneously, it also ensures that the resistivity of the composite metal assembly is within a reasonable range.

[0058] In some embodiments, the cross-sectional area of ​​the composite interface 11 is S1, and the area covered by the metal connector 30 on the composite interface 11 is S2, where 40% ≤ S2 / S1 ≤ 80%. By setting S2 / S1 within the above range, it is possible to ensure that the metal connector 30 has a good restraining force on the first metal component 10 and the second metal component 20, ensuring connection stability and structural strength. Simultaneously, it also ensures that the resistivity of the composite metal assembly is within a reasonable range.

[0059] In some embodiments, a composite interface 11 is formed between the first metal member 10 and the second metal member 20, and a metal connector 30 is disposed corresponding to the composite interface 11. The cross-sectional area of ​​the composite interface 11 is S1, and the area covered by the metal connector 30 on the composite interface 11 is S2, where 40% ≤ S2 / S1 ≤ 72%.

[0060] That is, the first metal part 10 and the second metal part 20 approach each other and form a composite interface 11, forming a whole through the composite interface 11. A metal connector 30 is provided corresponding to the composite interface 11, and is configured to connect the first metal part 10 and the second metal part 20, improving the composite effect of the first metal part 10 and the second metal part 20. Since the metal connector 30 typically has a more complex microstructure and strength than a single metal, it can significantly improve the connection stability between the first metal part 10 and the second metal part 20 through mechanical interlocking and embedding. At the same time, the metal connector 30 can also buffer and disperse stress to a certain extent, evenly distributing the stress concentrated at the connection part 31 to the first metal part 10 and the second metal part 20, reducing connection fatigue caused by excessive local stress, and ensuring the lifespan of the composite metal assembly. The metal connector 30 can also improve the electrical contact performance between the first metal part 10 and the second metal part 20 through its bonding performance with them, reducing resistivity and improving conductivity stability.

[0061] By setting S2 / S1 within the aforementioned range, it is possible to ensure that the metal connector 30 has a good restraining force on the first metal component 10 and the second metal component 20, ensuring connection stability and structural strength. Simultaneously, it also ensures that the resistivity of the composite metal assembly is within a reasonable range.

[0062] In some embodiments, a plurality of connecting portions 31 extend circumferentially and are radially spaced along the composite interface 11. As shown in Figures 5-6, the connecting portions 31 can be concentric circles, nested squares, ellipses, racetracks, or other shapes. By having a plurality of connecting portions 31 extend circumferentially and are radially spaced along the composite interface 11, connection stability can be improved.

[0063] In some embodiments, as shown in Figures 5-8, the spacing between adjacent connecting portions 31 increases in the direction from the center to the edge of the composite interface 11. That is, the density of connecting portions 31 is higher and the spacing is smaller in the region near the center of the composite interface 11, while the density of connecting portions 31 is lower and the spacing is larger in the region near the edge of the composite interface 11. This arrangement helps to ensure uniform stress distribution and connection stability.

[0064] As shown in Figure 5, when the cross-section of the metal connector 30 is circular, the connecting portion 31 can be circular or annular, and multiple connecting portions 31 can be arranged in a concentric circle configuration. Furthermore, the spacing between adjacent connecting portions 31 increases continuously from the center to the edge of the composite interface 11. As shown in Figure 6, when the cross-section of the metal connector 30 is rectangular, the connecting portion 31 can also be a rectangular frame, with multiple connecting portions 31 nested together. Furthermore, the spacing between adjacent connecting portions 31 increases continuously from the center to the edge of the composite interface 11. As shown in Figure 7, the connecting portions 31 can also be discontinuously arranged, and they are distributed radially from the center to the edge of the composite interface 11. As shown in Figure 8, the connecting portion 31 can also be strip-shaped, with multiple connecting portions 31 spaced apart. Furthermore, the spacing between adjacent connecting portions 31 increases continuously from the center to the edge of the composite interface 11.

[0065] For example, the first metal part 10 can be a copper layer, the second metal part 20 can be an aluminum layer, and the metal connector 30 can be a copper alloy part, an aluminum alloy part, a copper-aluminum alloy part, a nickel metal part, or a titanium metal part, etc., as long as it can restrain the first metal part 10 and the second metal part 20.

[0066] The present application is further illustrated below with reference to specific embodiments:

[0067] It should be noted that, unless otherwise specified, the composite metal component in the following embodiments and comparative examples is cylindrical in shape, the first metal part 10 is a copper layer, the second metal part 20 is an aluminum layer, and the metal connector 30 is a copper-aluminum alloy part. The first metal part 10, the metal composite layer and the second metal part 20 are stacked sequentially along the first direction. The specifications of the composite metal component are 10mm*10mm*100mm (that is, the width of the composite metal part is 10mm, the length is 100mm and the height is 10mm). The thickness of the first metal part 10 is 9mm and the thickness of the second metal part 20 is 1mm.

[0068] Example 1

[0069] In this embodiment, the thickness of the metal connector 30 in the first direction is 0.1 μm, and the ratio of the area S2 of the metal connector 30 covering the composite interface 11 to the cross-sectional area S1 of the composite interface 11 is 80%.

[0070] Example 2

[0071] In this embodiment, the thickness of the metal connector 30 in the first direction is 1.2 μm, and the ratio of the area S2 of the metal connector 30 covering the composite interface 11 to the cross-sectional area S1 of the composite interface 11 is 80%.

[0072] Example 3

[0073] In this embodiment, the thickness of the metal connector 30 in the first direction is 4.5 μm, and the ratio of the area S2 of the metal connector 30 covering the composite interface 11 to the cross-sectional area S1 of the composite interface 11 is 80%.

[0074] Example 4

[0075] In this embodiment, the thickness of the metal connector 30 in the first direction is 10 μm, and the ratio of the area S2 of the metal connector 30 covering the composite interface 11 to the cross-sectional area S1 of the composite interface 11 is 80%.

[0076] Example 5

[0077] In this embodiment, the thickness of the metal connector 30 in the first direction is 100 μm, and the ratio of the area S2 of the metal connector 30 covering the composite interface 11 to the cross-sectional area S1 of the composite interface 11 is 80%.

[0078] Example 6

[0079] In this embodiment, the thickness of the metal connector 30 in the first direction is 100 μm, and the ratio of the area S2 of the metal connector 30 covering the composite interface 11 to the cross-sectional area S1 of the composite interface 11 is 80%.

[0080] Example 7

[0081] In this embodiment, the thickness of the metal connector 30 in the first direction is 100 μm, and the ratio of the area S2 of the metal connector 30 covering the composite interface 11 to the cross-sectional area S1 of the composite interface 11 is 72%.

[0082] Example 8

[0083] In this embodiment, the thickness of the metal connector 30 in the first direction is 100 μm, and the ratio of the area S2 of the metal connector 30 covering the composite interface 11 to the cross-sectional area S1 of the composite interface 11 is 57%.

[0084] Example 9

[0085] In this embodiment, the thickness of the metal connector 30 in the first direction is 100 μm, and the ratio of the area S2 of the metal connector 30 covering the composite interface 11 to the cross-sectional area S1 of the composite interface 11 is 40%.

[0086] Comparative Example 1

[0087] In this comparative example, the thickness of the metal connector 30 in the first direction is 100 μm, and the metal connector 30 completely covers the composite interface 11. That is, the ratio of the area S2 of the composite interface 11 covered by the metal connector 30 to the cross-sectional area S1 of the composite interface 11 is 100%.

[0088] The resistance values ​​of the composite metal components in Examples 1-9 and Comparative Example 1 were tested, and the results are shown in Table 1:

[0089] Table 1. Comparison of resistance of composite metal components in different embodiments and comparative examples.

[0090]

[0091] As shown in Table 1, this embodiment of the application reduces the resistivity of the composite metal assembly by providing a metal connector 30 at the composite interface 11 of the first metal component 10 and the second metal component 20, and the metal connector 30 includes a plurality of spaced connecting portions 31. Furthermore, the metal connector 30 also improves the connection strength between the first metal component 10 and the second metal component 20.

[0092] Secondly, please refer to Figure 9, which is a structural schematic diagram of a first type of pole post 101 provided in an embodiment of this application. An embodiment of this application provides a pole post 101. The pole post 101 includes a first metal member 10 and a second metal member 20. The first metal member 10 includes a first segment 14 and a second segment 15 connected together. The outer diameter of the first segment 14 is smaller than the outer diameter of the second segment 15. The second metal member 20 includes a cylindrical body 27 and a flange 28. The cylindrical body 27 covers the first segment 14. The flange 28 is connected to the end face of the cylindrical body 27 near the second segment 15. The flange 28 extends radially along the pole post 101 and is embedded in the end of the second segment 15 facing the first segment 14. The flange 28 has a thickness dimension Hb in the axial direction of the pole post 101. The thickness dimension Hb of at least a portion of the flange 28 increases with increasing proximity to the axis of the pole post 101.

[0093] It is understood that the flange 28 may include an end with a gradually changing thickness dimension Hb and a portion with a uniform height and consistent thickness dimension Hb. Alternatively, the thickness dimension Hb of the entire flange 28 may be gradually changing.

[0094] It is understood that the first segment 14 and the second segment 15 are axially connected. Optionally, the first segment 14 and the second segment 15 are coaxially arranged.

[0095] Understandably, the diameter of the second segment 15 is larger than that of the first segment 14, so that the flange 28 can be embedded in the end face of the second segment 15 facing the first segment 14.

[0096] It is understood that the first metal component 10 has a columnar structure, and its material includes a first metal. The second metal component 20 has a layered structure, and its material includes a second metal. Here, the second metal and the first metal are different metals.

[0097] For example, the conductivity of the second metal is greater than that of the first metal, that is, the conductivity of the second metal is better than that of the first metal.

[0098] For example, the first metal has a higher fluidity than the second metal.

[0099] For example, the hardness of the second metal is greater than that of the first metal.

[0100] Understandably, when the electrode post 101 is applied to a battery cell, the first segment 14 and the flange 28 can be located outside the battery cell to serve as the output electrode. In this case, the material of the second metal part 20 is the same as that of the negative electrode current collector. The material of the first metal part 10 can be aluminum. The first segment 14 and the flange 28 can also be located inside the battery cell to prevent the electrode post 101 from detaching from the cover plate 110 of the battery cell when there is high voltage inside the battery cell. In this case, the material of the first metal part 10 is the same as that of the negative electrode current collector, and the material of the second metal part 20 can be aluminum.

[0101] In this embodiment, by increasing the thickness Hb of at least a portion of the flange 28 closer to the axis of the pole post 101, on the one hand, the thickness of the edge of the second segment 15 can be increased to ensure the welding thickness of the edge of the second segment 15. This allows the edge of the second segment 15 to have more material to impede the heat transfer during welding with other components, effectively preventing the second segment 15 from being welded through. On the other hand, the thickness Hb of the edge of the flange 28 can be reduced by pressing, allowing the material at the edge of the flange 28 to flow towards the axis of the pole post 101. This results in more material at the end of the flange 28 closer to the axis, which helps to increase the depth at which the second metal part 20 is embedded into the first metal part 10 near the axis. Thus, the reliability of the connection between the first metal part 10 and the second metal part 20 can be improved.

[0102] In addition, by causing the material at the edge of the flange 28 to flow toward the axis of the pole post 101, so that the end of the flange 28 near the axis has more material, it also helps to increase the depth of the second metal piece 20 intruding into the first metal piece 10 radially. This allows the side of the flange 28 near the axis to engage with the first metal piece 10 along the axis of the pole post 101 to prevent the first section 14 from coming out of the cylinder 27.

[0103] In some embodiments, the thickness Hb of the flange 28 gradually increases along the direction close to the axis of the pole post 101. In the longitudinal section of the pole post 101 through the flange 28, along the direction close to the axis of the pole post 101, the composite interface 11 formed by the flange 28 and the second segment 15 includes a first segment 161, a second segment 162, and a third segment 163 connected in sequence. The curvature of the second segment 162 is less than the curvature of the first segment 161 and the curvature of the third segment 163. And the end of the third segment 163 away from the second segment 162 extends between the outer peripheral surface of the first segment 14 and the inner wall of the cylinder 27.

[0104] It is understandable that the first line segment 161, the second line segment 162, and the third line segment 163 are connected smoothly in sequence.

[0105] In some embodiments, the concave sides of the first segment 161 and the third segment 163 are opposite to the second segment 15.

[0106] In this embodiment, the above-described configuration allows for several advantages: firstly, the portion of the first line segment 161 formed by the flange 28 can smoothly connect the side of the flange 28 away from the second segment 15 to the surface of the flange 28 embedded in the second segment 15; secondly, the thickness Hb can increase smoothly through the portion of the second line segment 162; and thirdly, the surface of the flange 28 embedded in the second segment 15 can smoothly transition to the inner wall of the cylinder 27 through the third line segment 163. This improves the stress concentration at the mating portion between the flange 28 and the first metal part 10, thereby improving the stress state of the pole post 101 and enhancing the reliability of the connection between the first metal part 10 and the second metal part 20.

[0107] In some embodiments, the curvature of the third line segment 163 is greater than the curvature of the first line segment 161. It is understood that this arrangement results in a larger radius at the end of the flange 28 furthest from the axis of the pole post 101, and a smaller radius at the end of the flange 28 closest to the axis of the pole post 101. This reduces the bulge at the end of the flange 28 furthest from the axis of the pole post 101, thereby reducing the amount of material at that end and allowing more material to flow towards the axis of the pole post 101. Simultaneously, it allows the end of the flange 28 closest to the pole post 101 to have more material, facilitating a greater insertion depth of the second metal member 20 into the first metal member 10. This, in turn, improves the reliability of the connection.

[0108] In some embodiments, the curvature of the first line segment 161 is 2 × 10⁻⁶. -4 mm -1 ~8×10 -4 mm -1 The curvature of the third line segment 163 is 7 × 10⁻⁶. -3 mm -1 ~1.2×10 -2 mm -1 .

[0109] It is understandable that the curvature of the first line segment 161 is, but is not limited to, 2 × 10⁻⁶. -4 mm -1 3×10 -4 mm -1 4×10 -4 mm -1 5×10 -4 mm -1 6×10 -4 mm -1 7×10 -4 mm -1 8×10 -4 mm -1 .

[0110] The curvature of the third line segment 163 is, but is not limited to, 7 × 10. -3 mm -1 8×10 -3 mm -1 9×10 -3 mm -1 1×10 -2 mm -1 1.2×10 -2 mm -1 .

[0111] In this embodiment, the above-mentioned limitations allow the first line segment 161 to connect the surface of the flange 28 away from the second segment 15 to the surface of the flange 28 that fits into the second segment 15 in a relatively smooth manner, and also allow the third line segment 163 to connect the surface of the flange 28 that fits into the second segment 15 to the inner surface of the cylinder 27 in a relatively smooth manner.

[0112] In some embodiments, the curvature of the second line segment 162 is less than or equal to 1 × 10⁻⁶. -4 mm -1 In this way, the material of the part of the flange 28 forming the second segment 162 can be reduced, so that the material of this part can flow to the third segment 163, so that the end of the flange 28 near the axis has more material, thereby increasing the depth of the second metal part 20 embedded in the first metal part 10 near the axis.

[0113] It is understandable that when the curvature of the second line segment 162 is 0, the second line segment 162 is a straight line. When the curvature of the second line segment 162 is less than 0, the center of the second line segment 162 and the center of the first line segment 161 are located on opposite sides of the joint surface between the flange 28 and the second segment 15, respectively. Specifically, the center of the second line segment 162 is located on the side of the joint surface between the flange 28 and the second segment 15 away from the first segment 14, while the centers of the first line segment 161 and the third line segment 163 are located on the side of the joint surface between the flange 28 and the second segment 15 closer to the first segment 14.

[0114] Based on the structure of the joint surface between the flange 28 and the second segment 15 provided in the above embodiments, the embodiments of this application further describe the structure of the joint surface between the flange 28 and the second segment 15 as follows.

[0115] Please refer to Figure 11, which is an enlarged view of another structure at point A in Figure 9 provided by an embodiment of this application. In some embodiments, in the longitudinal section of the pole post 101 through the flange 28, along the axial direction of the pole post 101, the composite interface 11 formed between the surface of the second metal member 20 near the axis of the pole post 101 and the outer peripheral surface of the first metal member 10 includes a fourth segment 164 and a fifth segment 165. The two ends of the fourth segment 164 are connected to the third segment 163 and the fifth segment 165, respectively. The curvature of the fourth segment 164 is less than the curvature of the third segment 163 and the curvature of the fifth segment 165.

[0116] It is understandable that the composite interface 11 formed between the surface of the second metal part 20 near the axis of the pole post 101 and the first metal part 10 also includes a sixth line segment 166, one end of which is connected to the fifth line segment 165, and the other end extends toward the bottom wall of the cylinder 27.

[0117] It is understandable that the bottom wall of the cylinder 27 is the part where the second metal part 20 covers the first section 14 and is away from the second section 15.

[0118] In this embodiment, the material at the fourth segment 164 of the flange 28 can be reduced by the above-described arrangement, allowing the material originally located at the fourth segment 164 to flow towards at least the fifth segment 165 based on the piercing pressure. This facilitates the fifth segment 165 protruding radially towards the axis of the pole post 101, thereby increasing the depth at which the portion of the second metal member 20 near the axis is embedded in the first metal member 10. In this way, the side of the flange 28 near the axis can engage with the first metal member 10 along the axis of the pole post 101 to prevent the first segment 14 from detaching from the cylinder 27.

[0119] In some embodiments, the curvature of the first line segment 161 is less than the curvature of the fifth line segment 165. It is understood that this arrangement results in a larger radius at the end of the flange 28 furthest from the axis of the pole post 101, and a smaller radius at the end of the flange 28 closest to the axis of the pole post 101. This reduces the bulge at the end of the flange 28 furthest from the axis of the pole post 101, thereby reducing the amount of material at that end and allowing more material to flow towards the axis of the pole post 101. Simultaneously, it allows the end of the flange 28 closest to the pole post 101 to have more material, facilitating a greater insertion depth of the second metal member 20 into the first metal member 10. This, in turn, improves the reliability of the connection.

[0120] In some embodiments, the curvature of the first line segment 161 is 3 × 10⁻⁶. -4 mm-1~9.5×10 -4 mm -1 The curvature of the third line segment 163 is 5 × 10⁻⁶. -4 mm-1~2×10 -3 mm-1, the curvature of the fifth line segment 165 is 7×10 -4 mm-1~3×10 -3 mm -1 .

[0121] It is understandable that the curvature of the first line segment 161 includes, but is not limited to, 3 × 10⁻⁶. -4 mm -1 4×10 -4 mm -1 5×10 -4 mm -1 6×10 -4 mm -1 7×10 -4 mm -1 8×10 -4 mm -1 9×10 - 4mm -1 9.5×10-4mm -1 .

[0122] It is understandable that the curvature of the third line segment 163 includes, but is not limited to, 5 × 10. -4 mm -1 6×10 -4 mm -1 7×10 -4 mm -1 8×10 -4 mm -1 9×10 -4 mm -1 1×10 -3 mm-1 2×10 -3 mm -1 .

[0123] It is understandable that the curvature of the fifth line segment 165 is not limited to 7×10. -4 mm -1 8×10 -4 mm-1, 9×10 -4 mm -1 1×10 -3 mm -1 2×10 -3 mm -1 3×10 -3 mm -1 .

[0124] In this embodiment, the above-mentioned limitations allow the first line segment 161 to connect the surface of the flange 28 away from the second segment 15 to the surface of the flange 28 that fits into the second segment 15 in a relatively smooth manner, and also allow the third line segment 163 and the fifth line segment 165 to connect the surface of the flange 28 that fits into the second segment 15 to the inner surface of the cylinder 27 in a relatively smooth manner.

[0125] In some embodiments, the curvature of the fourth line segment 164 is less than or equal to 1 × 10⁻⁶. -4 mm -1 Thus, the curvature relative to the fourth line segment 164 is greater than 1×10. -4 mm -1 In terms of structure, this arrangement can reduce the material of the part where the flange 28 forms the fourth segment 164, so that the material of this part can flow to the fifth segment 165, so that the end of the flange 28 near the axis has more material, thereby increasing the depth of the second metal part 20 embedded in the first metal part 10 near the axis.

[0126] It is understandable that when the curvature of the fourth line segment 164 is 0, the fourth line segment 164 is a straight line. When the curvature of the fourth line segment 164 is less than 0, the center of the fourth line segment 164 and the center of the third line segment 163 are located on opposite sides of the joint surface between the flange 28 and the second segment 15, respectively. Specifically, the center of the fourth line segment 164 is located on the side of the joint surface between the flange 28 and the second segment 15 away from the connection between the flange 28 and the cylinder 27, while the centers of the third line segment 163 and the fifth line segment 165 are located on the side of the joint surface between the flange 28 and the second segment 15 closer to the connection between the flange 28 and the cylinder 27.

[0127] Please refer to Figure 12, which is a schematic diagram of the forging flow lines 18 of the first metal part 10 provided in an embodiment of this application. In some embodiments, the first metal part 10 has a plurality of forging flow lines 18 in the longitudinal section of the pole post 101. The contact portion between the first metal part 10 and the second metal part 20 forms a composite interface 11; the first metal part 10 has a bonding region 19 close to the second metal part 20, and the plurality of forging flow lines 18 within the bonding region 19 extend along the composite interface 11. The bonding region 19 includes a tight region 191, and the spacing between the multiple forging flow lines 18 located in the tight region 191 is smaller than the spacing between the multiple forging flow lines 18 located in the other regions of the bonding region 19. The tight region 191 includes a first dense region 1911, a second dense region 1912 and a third dense region 1913. Along the thickness direction of the second metal part 20, the first dense region 1911 and the second dense region 1912 are respectively arranged opposite to the third line segment 163 and the fifth line segment 165. The third dense region 1913 is located at the axis of the first metal part 10 and is located away from the bottom wall of the cylinder 27.

[0128] It is understandable that the metal grains of the first metal material located in the compact region 191 are refined and arranged more closely, so that the first metal material located in the compact region 191 has an enhanced ability to hinder dislocation movement, thereby improving the strength and hardness of the first metal part 10 and improving the structural reliability of the pole post 101.

[0129] In addition, the first dense area 1911 and the second dense area 1912 are respectively positioned opposite to the third line segment 163 and the fifth line segment 165. In this way, the first dense area 1911 and the second dense area 1912 can clamp the flange 28, thereby improving the reliability of the connection between the first metal part 10 and the second metal part 20.

[0130] Referring to Figure 10 or Figure 11, in some embodiments, the two endpoints of the second line segment 162 are points U and V, respectively; the straight line UV and the radial direction of the pole post 101 form an angle W on the side away from the flange 28, satisfying: 0 < W ≤ 20°. This allows control over the steepness of the mating surface between the first metal part 10 and the second metal part 20 at points U and V. Consequently, the mating surface between the first metal part 10 and the second metal part 20 at points U and V is relatively gentle, thus, given a fixed maximum thickness of the flange 28, allowing the first metal part 10 and the second metal part 20 to have a larger mating surface in the axial direction, thereby improving the reliability of the connection between the first metal part 10 and the second metal part 20.

[0131] Please refer to Figure 9. In some embodiments, the outer diameter of the second segment 15 is Rb1, and the maximum radius of the flange 28 is Rb2, satisfying: 65%Rb1≤Rb2≤93%Rb1.

[0132] It is understandable that the maximum radius Rb2 of the flange 28 includes, but is not limited to, 65%Rb1, 66%Rb1, 68%Rb1, 69%Rb1, 70%Rb1, 76%Rb1, 81%Rb1, 85%Rb1, 90%Rb1, and 93%Rb1.

[0133] In this embodiment, the above-mentioned limitations ensure, on the one hand, the radial dimension of the flange 28 and the second segment 15 is sufficient to ensure the reliability of the connection between the first metal part 10 and the second metal part 20; on the other hand, the large radial dimension of the flange 28 is avoided from affecting the thickness of the second segment 15, thus ensuring the smooth welding of the second segment 15 with other components, and preventing the second segment 15 from being welded through, which would affect the reliability of the connection between the second segment 15 and the flange 28.

[0134] Please refer to Figures 13 and 14. Figure 13 is a schematic diagram of the structure of the second type of pole post 101 provided in an embodiment of this application, and Figure 14 is a schematic diagram of the structure of the second metal part 20 provided in an embodiment of this application. In some embodiments, there are multiple flanges 28. The multiple flanges 28 are arranged sequentially along the circumference of the pole post 101. At least two flanges 28 are arranged opposite each other along the radial direction of the pole post 101. In this way, the reliability of the connection between the first metal part 10 and the second metal part 20 can be improved, and the structural symmetry of the pole post 101 can be improved, so as to improve the stress state of the pole post 101.

[0135] In some embodiments, in the axial section of the pole post 101, the length of the composite interface 11 formed by the contact between the first metal member 10 and the second metal member 20 is Lb, and the outer diameter of the cylinder 27 is φb0, satisfying: 1φb0≤Lb≤5φb0. This allows for a larger composite interface 11 with a larger pole post 101, thereby ensuring that the bonding force between the first metal member 10 and the second metal member 20 matches the dimensions of the pole post 101, thus improving the structural reliability of the pole post 101.

[0136] It is understood that the length Lb of the composite interface 11 formed by the contact between the first metal part 10 and the second metal part 20 includes, but is not limited to, 1φb0, 1.2φb0, 1.5φb0, 1.8φb0, 2φb0, 2.2φb0, 2.4φb0, 2.5φb0, 2.8φb0, 3φb0, 3.5φb0, 3.6φb0, 4φb0, 4.3φb0, 4.8φb0, and 5φb0.

[0137] In some embodiments, φb0 ≤ 4 mm, and 3.6φb0 ≤ Lb ≤ 5φb0. 4 mm < φb0 < 8 mm, and 3φb0 ≤ Lb ≤ 3.6φb0. φb0 ≥ 8 mm, and 1φb0 ≤ Lb ≤ 3φb0.

[0138] It is understandable that when φb0≤4mm, the length Lb of the composite interface 11 formed by the contact between the first metal part 10 and the second metal part 20 includes, but is not limited to, 3.6φb0, 3.7φb0, 3.8φb0, 3.9φb0, 4φb0, 4.1φb0, 4.2φb0, 4.3φb0, 4.4φb0, 4.5φb0, 4.6φb0, 4.7φb0, 4.8φb0, 4.9φb0, and 5φb0.

[0139] When 4mm < φb0 < 8mm, the length Lb of the composite interface 11 formed by the contact between the first metal part 10 and the second metal part 20 includes, but is not limited to, 3φb0, 3.1φb0, 3.1φb0, 3.2φb0, 3.2φb0, 3.3φb0, 3.3φb0, 3.4φb0, 3.4φb0, 3.4φb0, 3.5φb0, 3.5φb0, 3.5φb0, 3.6φb0, and 3.6φb0.

[0140] When φb0 ≥ 8 mm, the length Lb of the composite interface 11 formed by the contact between the first metal part 10 and the second metal part 20 includes, but is not limited to, 1φb0, 1.2φb0, 1.5φb0, 1.8φb0, 2φb0, 2.3φb0, 2.3φb0, 2.4φb0, 2.4φb0, 2.5φb0, 2.5φb0, 2.6φb0, 2.6φb0, 2.7φb0, 2.7φb0, 2.8φb0, 2.8φb0, 2.9φb0, and 3φb0.

[0141] It is understandable that the larger the size of the pole post 101, the smaller the ratio of the length Lb of the composite interface 11 to the outer diameter φb0 of the cylinder 27. Conversely, the smaller the size of the pole post 101, the larger the ratio of the length Lb of the composite interface 11 to the outer diameter φb0 of the cylinder 27.

[0142] Referring to Figure 14, in some embodiments, there are two flanges 28. The second metal part 20 also includes two transition portions 281. The two transition portions 281 are connected to the end face of the cylinder 27 near the second segment 15. The two transition portions 281 and the two flanges 28 are staggered along the circumference of the pole post 101, and the two ends of the flanges 28 along the circumference of the pole post 101 are respectively connected to the two transition portions 281. The transition portions 281 are embedded in the end face of the second segment 15 facing the first segment 14. The composite interface 11 between part of the transition portion 281 and the second segment 15 is located on the circumferential surface of the second segment 15. In this way, the structural symmetry of the pole post 101 can be improved, and the structural strength of the second metal part 20 at the flanges 28 can be improved, thereby improving the structural strength of the pole post 101.

[0143] Referring to Figures 13 and 14, in some embodiments, the cross-section of the second segment 15 is rectangular. Two flanges 28 are spaced apart along the long side of the rectangle. The flanges 28 extend along the wide side of the rectangle. Two transition portions 281 are spaced apart along the narrow side of the rectangle. The transition portions 281 extend along the long side of the rectangle. It can be understood that the pole post 101 is smaller in the width direction of the rectangle, which is not conducive to forming the flanges 28.

[0144] In this embodiment, the above-mentioned configuration enables the directional pole 101 to have a flange 28 structure, which helps to improve the reliability of the connection between the first metal part 10 and the second metal part 20, and also makes the connection structure between the first metal part 10 and the second metal part 20 match the overall shape of the pole 101, thereby reducing the molding difficulty of the pole 101.

[0145] Referring to Figure 13, in some embodiments, the end face of the transition portion 281 away from the axis of the pole post 101 is coplanar with the side wall containing the long side of the second segment 15. This makes the surface structure of the pole post 101 regular, which is beneficial for assembly with other components.

[0146] Referring to Figures 10 or 11, in some embodiments, the contact area between the first metal member 10 and the second metal member 20 forms a composite interface 11. The pole post 101 includes a connecting portion 31. The connecting portion 31 extends along the composite interface 11 and encloses the composite interface 11. The connecting portion 31 comprises a first metal material and a second metal material mixed together. The thickness of the connecting portion 31 is Dc, and the thickness of the connecting portion 31 is non-uniform.

[0147] It is understood that a portion of the connecting part 31 in the thickness direction is located within the first metal part 10, and another portion of the connecting part 31 in the thickness direction is located within the second metal part 20.

[0148] Understandably, under the pressure of the pressing, the atoms at the contact points between the first metal part 10 and the second metal part 20 approach each other, causing one to diffuse into the other, thus forming a connection 31 where the first metal and the second metal are mixed.

[0149] The uneven thickness of the connecting part 31 means that at least two parts of the connecting part 31 have the same thickness.

[0150] In this embodiment, by forming a connecting portion 31 extending along the composite interface 11, the interlocking force between the first metal part 10 and the second metal part 20 on their opposing surfaces can be improved. That is, an interlocking connection structure consisting of many protrusions and many recesses can be formed on the two metal surfaces, thereby making the connection between the first metal part 10 and the second metal part 20 tighter and more reliable, and improving the ability to resist the separation between the first metal part 10 and the second metal part 20.

[0151] Please refer to Figure 10 or Figure 11. In some embodiments, the thickness dimension Dc satisfies: 1μm≤Dc≤8μm.

[0152] It is understood that the thickness dimension Dc of the connecting part 31 includes, but is not limited to, 1μm, 1.2μm, 1.5μm, 2.1μm, 2.7μm, 3.3μm, 3.8μm, 4.2μm, 4.6μm, 5.1μm, 5.5μm, 6.0μm, 6.4μm, 6.8μm, 7.2μm, 7.9μm, and 8μm.

[0153] Understandably, limiting the thickness Dc of the connecting part 31 can, on the one hand, ensure the material mixing depth between the first metal part 10 and the second metal part 20, so as to ensure the reliability of the connection between the first metal part 10 and the second metal part 20; on the other hand, it can avoid the cost of molding the pole post 101 being too high due to the excessive depth of the connecting part 31.

[0154] Referring to Figures 9 and 10, in some embodiments, the connecting portion 31 includes a first connecting portion 311 and a second connecting portion 312. The first connecting portion 311 is formed by mixing the material of the bottom wall of the cylinder 27 with the material of the end face of the first segment 14 away from the second segment 15. The second connecting portion 312 is formed by mixing the material of the inner circumferential surface of the cylinder 27 near the flange 28 with the material of the outer circumferential surface of the first segment 14 near the second segment 15. The thickness of the first connecting portion 311 is greater than the thickness of the second connecting portion 312. This improves the bonding force between the first metal member 10 and the second metal member 20 in the axial direction of the pole post 101, thereby enhancing the reliability of the connection between the first metal member 10 and the second metal member 20.

[0155] The connecting part 31 is a metallurgical layer, or the connecting part 31 is an alloy layer in which the first metal material and the second metal material are interlocked.

[0156] Please refer to Figure 15, which is a structural schematic diagram of another second metal part 20 provided in an embodiment of this application. In some embodiments, the flange 28 extends in a ring shape along the circumference of the first segment 14. In this way, the structural symmetry of the pole post 101 can be improved, thereby improving the stress state of the pole post 101 and thus improving the structural reliability of the pole post 101.

[0157] Referring to Figure 10 or Figure 11, in some embodiments, the diameter φb1 of the end of the first segment 14 near the second segment 15 is smaller than the diameter φb2 of the end of the first segment 14 away from the second segment 15. This causes the side of the flange 28 near the axis to engage with the first metal piece 10 along the axis of the pole post 101, preventing the first segment 14 from dislodging from the cylinder 27.

[0158] Referring to Figures 16 or 17, in some embodiments, the end face of the second segment 15 facing the first segment 14 is provided with a fitting groove 16. The flange 28 fits into the fitting groove 16. A gap a29 exists between the flange 28 and the fitting groove 16. Specifically, the gap a29 is located between the end of the flange 28 away from the axis of the pole post 101 and the groove wall of the fitting groove 16. This gap a29 can compensate for the mutual compression caused by the thermal expansion of the first metal part 10 and the second metal part 20 during the welding heating process of the pole post 101, thereby improving the stress state of the first metal part 10 and the second metal part 20.

[0159] In some embodiments, along the axial direction of the pole post 101 and in the direction close to the axis of the pole post 101, the size of the gap a29 in the radial direction of the pole post 101 gradually decreases. In this way, stress concentration at the joint between the first metal member 10 and the second metal member 20 can be avoided, thereby improving the stress state of the pole post 101.

[0160] Additionally, the side of the groove wall of the fitting groove 16 away from the axis of the pole post 101 smoothly transitions to the end face of the first segment 14 facing the second segment 15. The surface of the flange 28 away from the axis of the pole post 101 smoothly transitions to the surface of the flange 28 facing away from the first segment 14.

[0161] Please refer to Figure 16 or Figure 17. In some embodiments, the second segment 15 has a thickness dimension Da in the axial direction of the pole post 101; wherein the dimension of the gap a29 in the radial direction of the pole post 101 is La, satisfying: 0 < La ≤ 10% Da; and / or, the dimension of the gap a29 in the axial direction of the pole post 101 is Ha3, satisfying: 0 < Ha3 ≤ 40% Da.

[0162] In some embodiments, the radial dimension of the gap a29 in the pole post 101 is La, satisfying: 0 < La ≤ 10% Da; or, the axial dimension of the gap a29 in the pole post 101 is Ha3, satisfying: 0 < Ha3 ≤ 40% Da; or, the radial dimension of the gap a29 in the pole post 101 is La, satisfying: 0 < La ≤ 10% Da, and the axial dimension of the gap a29 in the pole post 101 is Ha3, satisfying: 0 < Ha3 ≤ 40% Da.

[0163] It is understood that the radial dimensions La of the gap a29 on the pole post 101 include, but are not limited to, 1%Da, 2%Da, 3%Da, 4%Da, 5%Da, 6%Da, 7%Da, 8%Da, 9%Da, and 10%Da.

[0164] It is understood that the dimensions Ha3 of the gap a29 in the axial direction of the pole 101 include, but are not limited to, 3%Da, 6%Da, 9%Da, 12%Da, 15%Da, 18%Da, 21%Da, 24%Da, 27%Da, 30%Da, 33%Da, 36%Da, 39%Da, and 40%Da.

[0165] In this embodiment, by limiting the radial dimension La of the gap a29 in the pole post 101, the gap a29 can be prevented from being too wide and reducing the bonding between the first metal part 10 and the second metal part 20, thereby helping to ensure the structural reliability of the pole post 101.

[0166] In this embodiment, by limiting the dimension Ha3 of the gap a29 in the axial direction of the pole post 101, the gap a29 can be prevented from being too high, which would reduce the bonding between the first metal part 10 and the second metal part 20, thereby helping to ensure the structural reliability of the pole post 101.

[0167] Please refer to Figure 18, which is a structural schematic diagram of the third type of pole post 101 provided in an embodiment of this application. In some embodiments, a mating groove 271 is provided at the end of the cylinder 27 away from the second section 15.

[0168] Understandably, the current collector 120 has a protrusion 121 extending towards the terminal post 101, and the protrusion 121 is inserted into the mating groove 271. In this way, the mating area between the current collector 120 and the terminal post 101 can be increased by the mating groove 271 and the protrusion 121, which helps to improve the current carrying capacity. At the same time, the structure of the mating groove 271 and the protrusion 121 can improve the positioning of the current collector 120 on the terminal post 101, thereby improving the assembly efficiency.

[0169] Among them, the current collector 120 connects the electrode tab to the electrode post 101.

[0170] Please refer to Figure 18. In some embodiments, the first segment 14 has a mating bottom wall 141 that is away from the second segment 15, and the bottom wall of the cylinder 27 protrudes toward the mating bottom wall 141 to be embedded in the mating bottom wall 141.

[0171] It is understood that the mating groove 271 can be formed by pressing, so that the bottom wall of the cylinder 27 protrudes into the mating bottom wall 141 and is embedded in the mating bottom wall 141. In this way, the area of ​​the mating surface between the first metal part 10 and the second metal part 20 can be increased, thereby improving the reliability of the mating between the first metal part 10 and the second metal part 20.

[0172] Referring to Figure 18, in some embodiments, the first segment 14 has a mating bottom wall 141 that is away from the second segment 15. The periphery of the mating bottom wall 141 protrudes towards the periphery of the bottom wall of the cylinder 27 to be embedded within the bottom wall of the cylinder 27. This increases the area of ​​the mating surface between the first metal member 10 and the second metal member 20, thereby improving the reliability of the connection between the first metal member 10 and the second metal member 20.

[0173] Referring to Figure 9 or Figure 18, in some embodiments, the diameter of the end of the cylinder 27 furthest from the second segment 15 is smaller than the diameter of the end of the cylinder 27 closest to the second segment 15. This effectively prevents the laser from passing through the gap a29 between the cylinder 27 and other components when laser welding the cylinder 27 to them, thus preventing burns to the component located on the side of the cylinder 27 closest to the second segment 15.

[0174] For example, when the seal 130 is fitted onto the cylinder 27, by making the diameter of the end of the cylinder 27 away from the second section 15 smaller than the diameter of the end of the cylinder 27 close to the second section 15, when welding the cylinder 27 to the manifold 120, the portion of the cylinder 27 with a larger diameter can block the laser, so as to prevent the laser from passing through the fitting gap a29 between the cylinder 27 and the manifold 120 and irradiating the sealing ring.

[0175] Referring to Figure 9 or Figure 18, the specific implementation structure where the diameter of the end of the cylinder 27 furthest from the second segment 15 is smaller than the diameter of the end of the cylinder 27 closest to the second segment 15 can be as follows. Specifically, in some embodiments, the outer circumferential surface of the cylinder 27 is a conical surface, or a stepped groove b272 is provided at the end of the outer circumferential surface of the cylinder 27 furthest from the second segment 15, and the stepped groove b272 extends in an annular shape along the circumference of the cylinder 27. This makes the outer circumferential structure of the cylinder 27 simple and easy to manufacture.

[0176] It is understandable that when the diameter of the end of the cylinder 27 furthest from the second section 15 is smaller than the diameter of the end of the cylinder 27 closest to the second section 15, the aforementioned outer diameter of the cylinder 27 refers to the maximum diameter of the cylinder 27.

[0177] Please refer to Figure 19, which is a structural schematic diagram of the fourth type of pole post 101 provided in an embodiment of this application. In some embodiments, the pole post 101 further includes a base plate 1019. The base plate 1019 is connected to the end of the cylinder 27 away from the second segment 15.

[0178] In some embodiments, the base plate 1019 is welded to the cylinder 27, or the pole post 101 is riveted to the base plate 1019.

[0179] Understandably, the base plate 1019 can cooperate with the cover plate 110 of the battery cell to press the seal 130 between them, thereby achieving a sealed fit between the terminal post 101 and the cover plate 110.

[0180] Referring to Figure 19, in some embodiments, the base plate 1019 is fitted onto the cylinder 27. The base plate 1019 is riveted to the cylinder 27. A pre-punched hole 273 is provided at the end of the cylinder 27 away from the second segment 15. The diameter of the pre-punched hole 273 gradually increases along the direction away from the second segment 15. Thus, when connecting the pole post 101 to the base plate 1019, a tool can be used to press the pre-punched hole 273, causing the second metal part 20 to expand radially outward, thereby reducing the fitting clearance a29 between the pole post 101 and the base plate 1019, facilitating the riveting of the pole post 101 to the base plate 1019.

[0181] It is understandable that when a mating groove 271 is provided at the end of the cylinder 27 away from the second section 15, the pre-punched hole 273 is provided at the opening of the mating groove 271.

[0182] In some embodiments, a stepped groove b272 is provided at the end of the cylinder 27 away from the second segment 15. The stepped groove b272 extends circumferentially around the cylinder 27 in an annular shape. The base plate 1019 is fitted into the stepped groove b272. In this way, the stepped groove b272 increases the mating structure between the base plate 1019 and the cylinder 27, which facilitates the installation of the base plate 1019 onto the cylinder 27, thereby improving assembly efficiency.

[0183] In some embodiments, the base plate 1019 is welded to the cylinder 27. This improves the stability of the connection between the base plate 1019 and the cylinder 27.

[0184] Understandably, when welding the pole post 101 to the base plate 1019, a tooling can be used to pre-punch the hole 273, causing the second metal part 20 to expand radially outward. This reduces the mating clearance a29 between the pole post 101 and the base plate 1019, allowing for riveting. Then, the pole post 101 is welded to the base plate 1019. Thus, the riveting action before welding improves the welding success rate and quality between the pole post 101 and the base plate 1019.

[0185] Referring to Figures 9, 13, or 18, in some embodiments, the second segment 15 is configured to be located outside the battery cell 1000. The end of the cylinder 27 away from the second segment 15 is configured to connect to the current collector 120, so that the terminal post 101 is clamped onto the cover plate 110 of the battery cell 1000 by the current collector 120 and the second segment 15.

[0186] Understandably, the second segment 15 is located on one side of the cover plate 110, and the manifold 120 is located on the other side of the cover plate 110.

[0187] It is understandable that in a cylindrical battery cell, the current collector 120 can be a current collector plate, while in a prismatic battery cell, the current collector 120 can be a current collector plate or a current collector pin.

[0188] In this embodiment, the base plate 1019 is eliminated by the above-described configuration, thereby reducing the number of components within the battery cell 1000. This not only reduces the weight of the battery cell 1000 but also allows the space originally configured for the base plate 1019 to be used for electrode assemblies, thus improving the energy density of the battery cell 1000.

[0189] Thirdly, please refer to Figures 20, 21, 22, 23, or 24. Figure 20 is a structural schematic diagram of a first type of cover plate assembly 100 provided in an embodiment of this application; Figure 21 is a structural schematic diagram of a second type of cover plate assembly 100 provided in an embodiment of this application; Figure 22 is a structural schematic diagram of a third type of cover plate assembly 100 provided in an embodiment of this application; Figure 23 is a structural schematic diagram of a fourth type of cover plate assembly 100 provided in an embodiment of this application; and Figure 24 is a structural schematic diagram of a fifth type of cover plate assembly 100 provided in an embodiment of this application. Accordingly, an embodiment of this application provides a cover plate assembly 100, which includes a cover plate 110 and the aforementioned pole post 101, with the pole post 101 passing through the cover plate 110.

[0190] It is understood that the pole post 101 may include a base plate 1019, as shown in Figures 20 to 23. The pole post 101 may also be without a base plate 1019 and be directly clamped to the cover plate by the current collector 120 and the second section 15, as shown in Figure 24.

[0191] In this embodiment, by employing the pole post 101 provided in some embodiments of this application, on the one hand, the thickness of the edge of the second segment 15 can be increased to ensure the welding thickness of the edge of the second segment 15. This allows the edge of the second segment 15 to have more material to impede the heat transfer during welding with other components, effectively preventing the second segment 15 from being welded through. On the other hand, the thickness Hb of the edge of the flange 28 can be reduced by overburdening, allowing the material at the edge of the flange 28 to flow towards the axis of the pole post 101. This results in more material at the end of the flange 28 near the axis, which helps to increase the depth at which the second metal part 20 is embedded into the first metal part 10 near the axis. Thus, the reliability of the connection between the first metal part 10 and the second metal part 20 can be improved, thereby enhancing the structural reliability of the cover plate assembly 100.

[0192] Referring to Figures 20, 21, 22, 23, or 24, in some embodiments, the cover assembly 100 further includes a first insulating member 112 and a second insulating member 113. The first insulating member 112 is disposed on one side of the cover 110. The second insulating member 113 is disposed on the other side of the cover 110. The second segment 15 and the flange 28 are located on the side of the first insulating member 112 facing away from the cover 110.

[0193] It is understood that the first insulating component 112 is the upper plastic component, and the second insulating component 113 is the lower plastic component. The first insulating component 112 insulates and isolates the second section 15 and the flange 28 from the cover plate 110. The second insulating component 113 insulates and isolates the cover plate 110 from the current collector 120, the tab, and the electrode assembly, etc.

[0194] Referring to Figures 20 to 23, in some embodiments, the cover assembly 100 further includes a seal 130. The seal 130 is disposed between the flange 28 and the cover 110, as shown in Figures 22 and 23; or, the seal 130 is located between the base plate 1019 and the cover 110, the base plate 1019 being connected to the end of the cylinder 27 away from the second segment 15, as shown in Figures 20 and 21.

[0195] It is understood that the seal 130 can be located between the base plate 1019 and the cover plate 110, or between the flange 28 and the cover plate 110. The specific location of the seal 130 is selected according to the application scenario.

[0196] Please refer to Figure 25, which is a structural schematic diagram of the first insulating member 112 provided in an embodiment of this application. In some embodiments, the surface of the first insulating member 112 facing the second segment 15 is provided with an exhaust groove 1121. The two ends of the exhaust groove 1121 extend to the inner and outer peripheral surfaces of the first insulating member 112, respectively. The exhaust groove 1121 facilitates the release of gas inside the battery cell 1000 after the gas pressure inside the battery cell 1000 reaches a certain threshold. The gas passes through the seal 130 to the space between the flange 28 and the exhaust groove 1121, and is discharged through the exhaust groove 1121, thereby facilitating the depressurization of the battery cell 1000.

[0197] In addition, the terminal has a non-circular cross-section, and a limiting groove is provided on the first insulating member 112. At least a portion of the terminal is located in the limiting groove and is in contact with the inner wall of the limiting groove. In this way, the terminal can be prevented from twisting by the first insulating member 112, thereby improving the torsional strength of the cover plate assembly 100.

[0198] For example, the terminal has a rectangular cross-section and beveled corners at all four corners.

[0199] In the embodiments of this application, the sealing element 130 can be disposed between the cover plate 110 and the flange 28, as shown in FIG23. The sealing element 130 can also be disposed between the base plate 1019 and the cover plate 110, as shown in FIG20 and FIG21. The cylinder 27 can be welded to the base plate 1019 or riveted to the base plate 1019. When welding the cylinder 27 to the base plate 1019, the cylinder 27 can be riveted to the base plate 1019 first, and then welded together. To achieve riveting, the bottom of the cylinder 27 is provided with a pre-punched hole 273, as shown in FIG18 and FIG19. The bottom of the cylinder 27 can be provided with a mating groove 271 to mate with the protrusion 121 on the collector 120, as shown in FIG18 and FIG21. The bottom of the cylinder 27 can also be a plane, as shown in FIG9, FIG20 and FIG235. The pole may include a base plate, as shown in Figures 20 to 23. Alternatively, the base plate 1019 may not be provided at the bottom of the pole 101, as shown in Figure 24. The above-mentioned configuration methods and combinations are set according to the actual application scenario, and this embodiment does not limit them.

[0200] Referring to Figures 16 or 17, in some embodiments, when the second segment 15 and the flange 28 are configured to be located outside the battery cell, the second segment 15 has a first surface 1013 adjacent to the first segment 14. The first surface 1013 includes a first region 1015 located on the outer peripheral side of the flange 28. The surface of the flange 28 facing away from the second segment 15 is a second region 1016. There is a height difference between the first region 1015 and the second region 1016. Both the first region 1015 and the second region 1016 are pressed against the first insulating member 112.

[0201] It is understandable that one of the first zone 1015 and the second zone 1016 protrudes outward along the axial direction of the pole post 101 to form a height difference.

[0202] For example, along the axial direction of the column, the first region 1015 protrudes outward from the first surface 1013. Alternatively, along the axial direction of the pole post 101, the second region 1016 protrudes outward from the plane containing the first surface 1013.

[0203] It is understandable that the cross-section of the second segment 15 can be cylindrical, polygonal, or irregular.

[0204] Understandably, the first region 1015 and the second region 1016 abut against the first insulating member 112, thereby subjecting the first insulating member 112 to axial pressure and achieving a seal between the mating surfaces of the pole post 101 and the first insulating member 112. The first region 1015 and the second region 1016 have a height difference, so that the one closer to the first insulating member 112 exerts a greater compressive force on it.

[0205] In this embodiment, by creating a height difference between the first region 1015 and the second region 1016, the region closer to the first insulator 112 exerts a greater compressive force on the first insulator 112. This locally increases the compressive force of the electrode post 101 on the first insulator 112, thereby improving the sealing between the electrode post 101 and the first insulator 112 while controlling the amount of material used in the electrode post 101, thus enhancing the reliability of the battery cell 1000.

[0206] In addition, when the first region 1015 protrudes outward along the axial direction of the pole post 101, it can improve the sealing performance of the outer periphery of the pressing surface between the pole post 101 and the first insulating member 112, thereby effectively preventing external debris and impurities from entering between the pole post 101 and the first insulating member 112, so as to ensure the stability of the sealing structure between the pole post 101 and the first insulating member 112.

[0207] Meanwhile, when the second region 1016 protrudes outward along the axial direction of the pole post 101, the inner circumferential side of the first insulating member 112 is subjected to greater pressure, thereby increasing the deformation of the inner circumferential side of the first insulating member 112, so that the periphery of the first insulating member 112 tilts towards the end face of the second segment 15, which helps to improve the sealing performance between the pole post 101 and the first insulating member 112 at the periphery.

[0208] Please refer to Figure 16. In some embodiments, along the axial direction of the pole post 101, the first region 1015 protrudes outward along the axial direction of the pole post 101, and the thickness dimension of the first region 1015 protruding relative to the second region 1016 is Ha1. The second segment 15 has a thickness dimension Da in the axial direction of the pole post 101, satisfying 0 < Ha1 ≤ 15%Da.

[0209] It is understandable that the thickness Ha1 of the first zone 1015 protruding outward includes, but is not limited to, 1%Da, 2%Da, 3%Da, 4%Da, 5%Da, 6%Da, 7%Da, 8%Da, 9%Da, 10%Da, 11%Da, 12%Da, 13%Da, 14%Da, and 15%Da.

[0210] For example, the thickness dimension Da of the pole 101 is 2 mm, Ha1 = 10%Da = 0.2 mm.

[0211] In this embodiment, by limiting the material used in the first region 1015, the amount of material protruding can be controlled, which is conducive to controlling the weight of the pole post 101. On the other hand, the thickness Ha1 of the first region 1015 protruding is too large, which would make it difficult to fit the pole post 101 with the first insulating member 112 and make the dimensional chain more complex.

[0212] When the first zone 1015 protrudes outward along the axial direction of the pole post 101, an exhaust groove can be provided on the side of the first insulating member 112 away from the cover plate 110. In this way, while improving the sealing between the pole post 101 and the cover plate 110, the flow of gas between the first insulating member 112 and the second zone 1016 can also be improved, thereby improving the exhaust effect.

[0213] In some embodiments, 2%Da≤Ha1≤15%Da. This makes the crimping of the first region 1015 onto the first insulating member 112 more obvious, which helps to make the protrusion of the first region 1015 more effective in improving the sealing between the pole post 101 and the first insulating member 112.

[0214] Referring to Figure 17, in some embodiments, along the axial direction of the pole post 101, the second region 1016 protrudes outward along the axial direction of the pole post 101. The thickness of the second region 1016 protruding relative to the first region 1015 is Ha2. The second segment 15 has a thickness Da in the axial direction of the pole post 101, satisfying 0 < Ha2 ≤ 15%Da.

[0215] It is understood that the thickness dimension Ha2 of the second zone 1016 protruding outward includes, but is not limited to, 1%Da, 2%Da, 3%Da, 4%Da, 5%Da, 6%Da, 7%Da, 8%Da, 9%Da, 10%Da, 11%Da, 12%Da, 13%Da, 14%Da, and 15%Da.

[0216] For example, the second segment 15 has a circumferential dimension Da of 2 mm in the pole post 101, and Ha2 = 10%Da = 0.2 mm.

[0217] In this embodiment, by limiting the material used in the second region 1016, the amount of material protruding can be controlled to control the weight of the pole post 101. On the other hand, the thickness Ha2 of the second region 1016 protruding can be avoided from being too large, which would make it difficult to fit the pole post 101 with the first insulating member 112 and make the dimensional chain more complex.

[0218] In some embodiments, 2%Da≤Ha2≤15%Da. This makes the crimping of the second region 1016 onto the first insulating member 112 more obvious, which helps to make the protrusion of the second region 1016 more effective in improving the sealing between the pole post 101 and the first insulating member 112.

[0219] In some embodiments, the first region 1015 protrudes outward along the axial direction of the pole post 101 to form a first protrusion 1017, the first protrusion 1017 extending in a ring shape along the circumferential direction of the pole post 101; or, the second region 1016 protrudes outward along the axial direction of the pole post 101 to form a second protrusion 1018, the second protrusion 1018 extending in a ring shape along the circumferential direction of the pole post 101.

[0220] In this embodiment, by making the first protrusion 1017 extend into a ring along the circumference of the electrode post 101, the uniformity of stress on the electrode post 101 and the first insulating member 112 can be improved, which is conducive to improving the stress state of the battery cell 1000 and avoiding stress concentration.

[0221] In addition, by making the second protrusion 1018 extend into a ring along the circumference of the electrode post 101, the uniformity of stress on the electrode post 101 and the first insulating member 112 can be improved, which is conducive to improving the stress state of the battery cell 1000 and avoiding stress concentration.

[0222] Fourthly, please refer to Figure 26, which is a structural schematic diagram of the battery cell 1000 provided in an embodiment of this application. Accordingly, an embodiment of this application provides a battery cell 1000, including a housing 1100, an electrode assembly, and the aforementioned cover assembly 100; the housing 1100 has a receiving cavity; the electrode assembly is disposed in the receiving cavity, and the electrode assembly includes tabs; the cover 110 is connected to the housing 1100 and closes the opening of the receiving cavity, and the electrode post 101 is connected to the tabs.

[0223] It is understood that the electrode assembly includes at least a positive electrode plate, a separator, and a negative electrode plate stacked sequentially. The positive electrode plate can be connected to the positive electrode post 101 via a positive electrode tab, and the negative electrode tab can be connected to the negative electrode post 101 via a negative electrode plate.

[0224] The 1000 battery cells can specifically be cylindrical battery cells, prismatic battery cells, pouch battery cells, blade battery cells, etc.

[0225] In this embodiment, by employing the cover plate assembly 100 provided in some embodiments of this application, on the one hand, the thickness of the edge of the second segment 15 can be increased to ensure the welding thickness of the edge of the second segment 15. This allows the edge of the second segment 15 to have more material to impede the heat transfer during welding with other components, effectively preventing the second segment 15 from being welded through. On the other hand, the thickness Hb of the edge of the flange 28 can be reduced by pressing, allowing the material at the edge of the flange 28 to flow towards the axis of the electrode post 101. This results in more material at the end of the flange 28 near the axis, which helps to increase the depth at which the second metal part 20 is embedded in the first metal part 10 near the axis. Thus, the reliability of the connection between the first metal part 10 and the second metal part 20 can be improved, thereby enhancing the structural reliability of the battery cell 1000.

Claims

1. A composite metal component, comprising a first metal component, a second metal component, and a metal connector disposed between the first metal component and the second metal component, the metal connector being configured to connect the first metal component and the second metal component; in, The first metal part, the second metal part, and the metal connector are all made of different materials. The metal connector includes multiple connecting parts, which are configured to connect the first metal part and the second metal part, and the multiple connecting parts are spaced apart.

2. The composite metal component according to claim 1, wherein, The first metal part and the metal connector are an integral structure; And / or, the second metal part and the metal connector are an integral structure.

3. The composite metal component according to claim 1 or 2, wherein, The first metal component and the second metal component are stacked along a first direction, and the maximum thickness of the metal connector in the first direction is 0.1 μm - 1 mm.

4. The composite metal component according to any one of claims 1-3, wherein, A gap is formed between adjacent connecting portions, and the first metal member and / or the second metal member extends into the gap so that the first metal member and the second metal member are in direct contact at the gap.

5. The composite metal component according to claim 4, wherein, The minimum spacing between adjacent connecting parts is 1μm-100μm.

6. The composite metal component according to any one of claims 1-5, wherein, A composite interface is formed between the first metal component and the second metal component, and the metal connector is provided corresponding to the composite interface; The area of ​​the composite interface is S1, and the area of ​​the composite interface covered by the metal connector is S2, where 40% ≤ S2 / S1 ≤ 80%.

7. The composite metal component according to claim 6, wherein, The plurality of connecting portions extend circumferentially along the composite interface, and the plurality of connecting portions are distributed radially spaced along the composite interface.

8. The composite metal component according to any one of claims 1-7, wherein, The spacing between adjacent connecting portions increases in the direction from the center of the composite interface to the edge of the composite interface.

9. A pole comprising the composite metal component as described in any one of claims 1-8.

10. The pole post according to claim 9, wherein, include: The first metal component includes a first segment and a second segment connected together, wherein the outer diameter of the first segment is smaller than the outer diameter of the second segment; The second metal part includes a cylindrical body and a flange. The cylindrical body covers the first section, and the flange is connected to the end of the cylindrical body near the second section. The flange extends radially along the pole post and is embedded in the end face of the second section facing the first section. Wherein, along the axial direction of the pole post, the flange has a thickness dimension Hb, and at least a portion of the flange's thickness dimension Hb increases as it approaches the axis of the pole post.

11. The pole post according to claim 10, wherein, In the longitudinal section of the pole post through the flange, along the axial direction close to the pole post, the joint interface formed by the flange and the second segment includes a first segment, a second segment and a third segment connected in sequence. The curvature of the second line segment is less than the curvature of the first line segment and the curvature of the third line segment.

12. The pole post according to claim 11, wherein, The curvature of the third line segment is greater than that of the first line segment.

13. The pole post according to claim 11 or 12, wherein, In the longitudinal section, along the axial direction of the pole post, the interface formed between the surface of the second metal part near the axis of the pole post and the outer peripheral surface of the first metal part includes a fourth line segment and a fifth line segment, the two ends of the fourth line segment being connected to the third line segment and the fifth line segment respectively; wherein, the curvature of the fourth line segment is less than the curvature of the third line segment and the curvature of the fifth line segment.

14. The pole post according to claim 13, wherein, In the longitudinal section of the pole post, the first metal part has multiple forging flow lines, and the contact area between the first metal part and the second metal part forms a bonding interface. The first metal part has a bonding region close to the second metal part, and a plurality of forging flow lines in the bonding region extend along the bonding interface; the bonding region includes a tight region, and the spacing of the plurality of forging flow lines in the tight region is smaller than the spacing of the plurality of forging flow lines in the remaining regions of the bonding region. The dense region includes a first dense region, a second dense region, and a third dense region. Along the thickness direction of the second metal part, the first dense region and the second dense region are respectively arranged opposite to the third line segment and the fifth line segment. The third dense region is located at the axis of the first metal part and is located away from the bottom wall of the cylinder.

15. The pole post according to any one of claims 10-14, wherein, The outer diameter of the second segment is Rb1, and the maximum radius of the flange is Rb2, satisfying: 65%Rb1≤Rb2≤93%Rb1.

16. The pole post according to any one of claims 10-15, wherein, In the axial section of the pole, the length of the composite interface formed by the first metal part and the second metal part in contact with each other is Lb, and the outer diameter of the cylinder is φb0, satisfying: 1φb0≤Lb≤5φb0.

17. The pole post according to any one of claims 10-16, wherein, The second metal part further includes two transition portions, which are connected to the end face of the cylinder near the second section. The two transition portions and the two flanges are staggered along the circumference of the pole post, and the two ends of the flanges along the circumference of the pole post are respectively connected to the two transition portions. The transition portion is embedded in the end face of the second segment facing the first segment, and part of the interface between the transition portion and the second segment is located on the circumferential surface of the second segment.

18. The pole post according to claim 17, wherein, The second segment has a rectangular cross-section. The two flanges are spaced apart along the long side of the rectangle and extend along the wide side of the rectangle. The two transition portions are spaced apart along the narrow side of the rectangle and extend along the long side of the rectangle.

19. A cover plate assembly, comprising: Cover plate; And a pole as described in any one of claims 9 to 18, the pole passing through the cover plate.

20. A single battery cell, comprising: The shell has a receiving cavity; An electrode assembly is disposed in the receiving cavity, the electrode assembly including tabs; And the cover plate assembly as claimed in claim 19, wherein the cover plate is connected to the housing and closes the opening of the receiving cavity, and the pole post is connected to the pole tab.

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