A pole assembly and a battery

Abstract

The application provides a pole assembly and a battery, and belongs to the technical field of batteries. The pole assembly comprises a pole and a connecting piece. The pole and the connecting piece are arranged in a stack along a first direction, and the pole and the connecting piece are connected by a welding portion. A first welding surface is formed on a side of the pole close to the connecting piece, the welding portion is arranged on the first welding surface, and a first welding track is formed on the first welding surface. The first welding track comprises a plurality of first welding track segments arranged at intervals along the first welding surface in a radial direction. The pole assembly provided by the application can reduce the inductance effect during current transmission, thereby ensuring the stability of current transmission between the connecting piece and the pole.

Description

[0001] This application claims priority to Chinese Patent Application No. 202520916423.1, filed with the Chinese Patent Office on May 9, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, specifically to an electrode assembly and a battery. Background Technology

[0003] In related technologies, battery terminals and connecting pieces are typically connected by welding. The weld's performance is usually judged by the effective weld area or the length of the weld path. While this meets the requirements for weld stability, electromagnetic induction can easily occur when current passes through the weld path between the terminals and connecting pieces, affecting the stability of current transmission and consequently resulting in poor stability of the battery's power supply. Utility Model Content

[0004] The embodiments of this application provide an electrode assembly and a battery that can reduce the electromagnetic induction effect at the weld while ensuring the welding stability of the electrode and connecting piece, thus ensuring the stability of current transmission.

[0005] In a first aspect, embodiments of this application provide a pole assembly, including a pole and a connecting piece;

[0006] The pole and the connecting piece are stacked along the first direction, and the pole and the connecting piece are welded together by a welding part;

[0007] The side of the pole near the connecting piece forms a first welding surface, the welding part passes through the first welding surface, and a first welding trajectory is formed on the first welding surface;

[0008] The first welding trajectory includes a plurality of first welding trajectory segments arranged radially at intervals along the first welding surface.

[0009] In some embodiments, the center of the first welding trajectory coincides with the center of the first welding surface.

[0010] In some embodiments, the first welding trajectory includes a first spiral portion radially distributed along the first welding surface, or the first welding trajectory includes a plurality of first annular portions arranged substantially concentrically.

[0011] In some embodiments, the minimum spacing between adjacent first welding trajectory segments is 0.8 mm to 2.0 mm.

[0012] In some embodiments, the minimum width of the first welding trajectory segment is H, where 1.0 mm ≤ H ≤ 2.0 mm.

[0013] In some embodiments, the welding part passes through the connecting piece, and the side of the connecting piece away from the pole post has a second welding surface, and the welding part forms a second welding trajectory on the second welding surface;

[0014] The second welding trajectory includes multiple second welding trajectory segments that overlap radially along the second welding surface.

[0015] In some embodiments, the second welding trajectory includes a second spiral portion distributed along the second welding surface;

[0016] Alternatively, the second welding trajectory may include multiple concentrically arranged second annular portions.

[0017] In some embodiments, the pole and the connecting piece are interlocked.

[0018] In some embodiments, the pole post is provided with a groove structure on the side near the connecting piece, and the connecting piece is provided with a protrusion structure on the side near the pole post;

[0019] The groove structure and the protrusion structure are interlocked and connected.

[0020] In some embodiments, the first welding trajectory includes a plurality of first annular portions arranged substantially concentrically, the outline shape of the first annular portions being polygonal or circular.

[0021] In some embodiments, the first welding trajectory includes a first sub-welding trajectory segment, a second sub-welding trajectory segment, and a third sub-welding trajectory segment distributed radially along the first welding surface, wherein the second sub-welding trajectory segment is disposed around the periphery of the first sub-welding trajectory segment, and the third sub-welding trajectory segment is disposed around the periphery of the second sub-welding trajectory segment.

[0022] The effective penetration depth of the first welding sub-section corresponding to the first sub-welding trajectory segment is W1, the effective penetration depth of the second welding sub-section corresponding to the second sub-welding trajectory segment is W2, and the effective penetration depth of the third welding sub-section corresponding to the third sub-welding trajectory segment is W3, where W1 < W2 < W3.

[0023] In some embodiments, the minimum spacing between the first sub-welding trajectory segment and the second sub-welding trajectory segment is L1, and the minimum spacing between the second sub-welding trajectory segment and the third sub-welding trajectory segment is L2, where 0.8 ≤ L1 / L2 ≤ 1.2.

[0024] Secondly, embodiments of this application provide a battery including the electrode assembly described above.

[0025] The beneficial effects of the embodiments of this application are as follows:

[0026] In embodiments of this application, the electrode assembly includes an electrode and a connecting piece. The electrode and the connecting piece are stacked along a first direction and are welded together by a welding part. A first welding surface is formed on the side of the electrode near the connecting piece, the welding part passes through the first welding surface, and a first welding trajectory is formed on the first welding surface. The first welding trajectory includes a plurality of first welding trajectory segments arranged radially spaced along the first welding surface. That is, after the electrode and the connecting piece are welded together by the welding part, a plurality of first welding trajectory segments are formed on the first welding surface, and the plurality of first welding trajectory segments are arranged radially spaced along the first welding surface. The electrode and the connecting piece are connected by the plurality of first welding trajectory segments arranged radially spaced along the first welding surface. When current is transmitted between the connecting piece and the electrode, an electromagnetic induction effect is generated at the first welding trajectory segment. Since the plurality of first welding trajectory segments are arranged radially spaced along the first welding surface, the electromagnetic induction generated by the current at adjacent first welding trajectory segments will cancel each other out, thereby reducing the overall inductive effect and ensuring the stability of current transmission between the connecting piece and the electrode. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the longitudinal cross-sectional structure of the pole assembly provided in the embodiments of this application. Figure 1 ;

[0029] Figure 2 This is a schematic cross-sectional view of the pole assembly provided in an embodiment of this application. Figure 1 ;

[0030] Figure 3 This is a schematic cross-sectional view of the pole assembly provided in an embodiment of this application. Figure 2 ;

[0031] Figure 4 This is a schematic cross-sectional view of the pole assembly provided in an embodiment of this application. Figure 3 ;

[0032] Figure 5 This is a schematic cross-sectional view of the pole assembly provided in an embodiment of this application. Figure 4 ;

[0033] Figure 6 This is a bottom view of the pole assembly provided in the embodiments of this application. Figure 1 ;

[0034] Figure 7This is a bottom view of the pole assembly provided in the embodiments of this application. Figure 2 ;

[0035] Figure 8 This is a schematic diagram of the longitudinal cross-sectional structure of the pole assembly provided in the embodiments of this application. Figure 2 ;

[0036] Figure 9 This is a schematic diagram of the longitudinal section structure of the pole provided in the embodiment of this application;

[0037] Figure 10 This is a schematic diagram of the longitudinal cross-sectional structure of the connecting piece provided in the embodiment of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 10. Pole post; 11. First welding surface; 12. First welding trajectory; 121. First sub-welding trajectory segment; 122. Second sub-welding trajectory segment; 123. Third sub-welding trajectory segment; 13. First annular portion; 131. First sub-annular portion; 132. Second sub-annular portion; 133. Third sub-annular portion; 14. Groove structure; 15. First spiral portion; 151. First sub-spiral portion; 152. Second sub-spiral portion; 153. Third sub-spiral portion; 20. Connecting piece; 21. Second welding surface; 22. Second welding trajectory; 221, Fourth sub-welding trajectory segment; 222, Fifth sub-welding trajectory segment; 223, Sixth sub-welding trajectory segment; 23, Second annular portion; 231, Fourth sub-annular portion; 232, Fifth sub-annular portion; 233, Sixth sub-annular portion; 24, Protruding structure; 25, Second spiral portion; 251, Fourth sub-spiral portion; 252, Fifth sub-spiral portion; 253, Sixth sub-spiral portion; 30, Welding portion; 31, First welding sub-portion; 32, Second welding sub-portion; 33, Third welding sub-portion. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0041] Firstly, such as Figures 1-4As shown, an embodiment of this application provides an electrode assembly including an electrode post 10 and a connecting piece 20. The electrode post 10 and the connecting piece 20 are stacked along a first direction X, and are welded together by a welding portion 30. A first welding surface 11 is formed on the side of the electrode post 10 near the connecting piece 20, the welding portion 30 passes through the first welding surface 11, and a first welding trajectory 12 is formed on the first welding surface 11. The first welding trajectory 12 includes a plurality of first welding trajectory 12 segments arranged radially spaced along the first welding surface 11. That is, after the electrode post 10 and the connecting piece 20 are welded by the welding portion 30, a plurality of first welding trajectory 12 segments are formed on the first welding surface 11, and the plurality of first welding trajectory 12 segments are arranged radially spaced along the first welding surface 11, and the electrode post 10 and the connecting piece 20 are connected by the plurality of first welding trajectory 12 segments arranged radially spaced along the first welding surface 11. When current is transmitted between the connecting piece 20 and the pole piece 10, an electromagnetic induction effect is generated at the first welding trajectory 12 segment. Since multiple first welding trajectory 12 segments are arranged radially at intervals along the first welding surface 11, the electromagnetic induction generated by the current at adjacent first welding trajectory 12 segments will cancel each other out, thereby reducing the overall inductance effect and ensuring the stability of current transmission between the connecting piece 20 and the pole piece 10.

[0042] The terminal post 10 and connecting piece 20 in a battery are crucial components for current transmission. To ensure the connection stability of the terminal post 10 and connecting piece 20, they are typically connected by welding. After welding, a welding trajectory is formed. The material at the welding trajectory differs from that of the terminal post 10 and connecting piece 20, resulting in different conductivity. When current flows through the welding trajectory, changes in resistivity occur due to the difference, leading to electromagnetic induction. Electromagnetic induction affects the stability of current transmission, thus reducing the stability of battery power supply. The terminal post assembly provided in this application embodiment is welded by a welding part 30, and the welding part 30 forms a first welding trajectory 12 on the first welding surface 11. The first welding trajectory 12 includes multiple segments of the first welding trajectory 12 arranged radially spaced along the first welding surface 11. When current flows through the multiple segments of the multiple segments of the first welding trajectory 12 arranged radially spaced along the first welding surface 11, the electromagnetic induction generated by adjacent segments of the first welding trajectory 12 at least partially cancels each other out, thereby reducing the overall electromagnetic induction, improving the stability of current transmission between the connecting piece 20 and the terminal post 10, and ensuring the stability of battery power supply to the outside world. The arrangement of the first welding surface 11 radially can ensure that the electromagnetic induction generated by the multiple first welding trajectory segments 12 cancels each other out.

[0043] It is understood that the multiple segments of the first welding trajectory 12 can be interconnected or independent of each other. For example, a spiral first welding trajectory 12 includes multiple interconnected segments, and adjacent segments are preferably spaced radially apart along the first welding surface 11. A concentric circular first welding trajectory 12 includes multiple independent segments, and adjacent segments are also preferably spaced radially apart along the first welding surface 11.

[0044] The first annular portion 13 refers to the trajectory formed by a closed curve. The first annular portion 13 can be a circular ring, a polygonal ring, a square ring, an elliptical ring, or other annular structures.

[0045] In some embodiments, the center of the first welding trajectory 12 coincides with the center of the first welding surface 11. The electrode 10 contacts the connecting piece 20 through the first welding surface 11, and during current transmission, the current is transmitted through the first welding surface 11. By aligning the center of the first welding trajectory 12 with the center of the first welding surface 11, electromagnetic induction during current transmission between the connecting piece 20 and the electrode 10 can be reduced, ensuring the stability of current transmission.

[0046] In some embodiments, the first welding trajectory 12 includes a first spiral portion 15 radially distributed along the first welding surface 11, or the first welding trajectory 12 includes a plurality of first annular portions 13 arranged substantially concentrically.

[0047] When the first welding trajectory 12 includes a first spiral portion 15 radially distributed along the first welding surface 11, a spiral welding trajectory is formed, which enables the current phase difference of multiple segments of the first welding trajectory 12 in the first spiral portion 15 to change periodically, and the electromagnetic induction is partially canceled in space. When the first welding trajectory 12 includes multiple first annular portions 13 arranged substantially concentrically, adjacent annular welding trajectories can generate reverse eddy currents, and the electromagnetic induction is suppressed in the frequency domain.

[0048] In some embodiments, the minimum spacing between adjacent first welding trajectory segments 12 is 0.8mm-2.0mm. By requiring the minimum spacing between adjacent first welding trajectory segments 12 to be 0.8mm-2.0mm, defects such as local overheating or lack of fusion during the welding process can be reduced, ensuring the welding quality between the electrode post 10 and the connecting piece 20, and ensuring the welding area between the electrode post 10 and the connecting piece 20, thus ensuring good current carrying capacity and improving the stability of current transmission between the electrode post 10 and the connecting piece 20.

[0049] like Figure 2As shown, the first welding trajectory 12 includes a first annular portion 13 arranged basically concentrically. Adjacent first annular portions 13 have a spacing. Specifically, the first annular portion 13 includes a first sub-annular portion 131, a second sub-annular portion 132, and a third sub-annular portion 133. The first sub-annular portion 131, the second sub-annular portion 132, and the third sub-annular portion 133 serve as different segments of the first welding trajectory 12. The minimum spacing between the first sub-annular portion 131 and the second sub-annular portion 132 meets the requirement of 0.8mm-2.0mm, and the minimum spacing between the second sub-annular portion 132 and the third sub-annular portion 133 also meets the requirement of 0.8mm-2.0mm.

[0050] like Figure 4 As shown, the first welding trajectory 12 includes a first spiral section 15. The first spiral section 15 includes a first sub-spiral trajectory segment, a second sub-spiral trajectory segment, and a third spiral sub-spiral trajectory segment distributed radially along the first welding surface 11. The first sub-spiral trajectory segment, the second sub-spiral trajectory segment, and the third sub-spiral trajectory segment are different segments of the first welding trajectory 12. The minimum spacing between the first sub-spiral trajectory segment and the second sub-spiral trajectory segment meets the requirement of 0.8mm-2.0mm, and the minimum spacing between the second sub-spiral trajectory segment and the third sub-spiral trajectory segment also meets the requirement of 0.8mm-2.0mm.

[0051] For example, the minimum spacing between adjacent first welding trajectory segments 12 can be 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm or 2.0mm.

[0052] In some embodiments, such as Figure 3 and Figure 5 As shown, the minimum width of the first welding trajectory 12 is H, where 1.0mm ≤ H ≤ 2.0mm. By making the minimum width of the first welding trajectory 12 between 1.0mm and 2.0mm, the welding strength between the pole 10 and the connecting piece 20 can be guaranteed, improving the welding stability and reliability of the pole 10 and the connecting piece 20. Simultaneously, the current-carrying area between the pole 10 and the connecting piece 20 can be guaranteed, ensuring the effective transmission of current between the pole 10 and the connecting piece 20. Furthermore, with the minimum width of the first welding trajectory 12 within this range, the space occupied by the first welding trajectory 12 is minimized.

[0053] Understandably, the wider the first welding trajectory 12, the larger the corresponding welding area and the better the connection stability, but the larger the space it occupies. By making the minimum width H of the first welding trajectory 12 1.0mm-2.0mm, the weld surface can be ensured while reducing the occupied area.

[0054] In some embodiments, such as Figure 6 and Figure 7As shown, the welding part 30 passes through the connecting piece 20, and the connecting piece 20 has a second welding surface 21 on the side opposite to the pole post 10. The welding part 30 forms a second welding trajectory 22 on the second welding surface 21. The second welding trajectory 22 includes a plurality of second welding trajectory 22 segments arranged radially overlapping along the second welding surface 21.

[0055] For example, such as Figure 6 and Figure 8 As shown, the welding section 30 includes multiple welding sub-sections, namely a first welding sub-section 31, a second welding sub-section 32, and a third welding sub-section 33. Each welding sub-section forms a second welding trajectory segment 22 on the second welding surface 21, namely a fourth sub-welding trajectory segment 221, a fifth sub-welding trajectory segment 222, and a sixth sub-welding trajectory segment 223. The second welding trajectory 22 is a second annular section 23, the fourth sub-welding trajectory segment 221 corresponds to the fourth sub-annular section 231, the fifth sub-welding trajectory segment 222 corresponds to the fifth sub-annular section 232, and the sixth sub-welding trajectory segment 223 corresponds to the sixth sub-annular section 233. Adjacent second annular sections 23 overlap to form overlapping areas. This overlap between adjacent second annular sections 23 increases the welding area and improves the connection stability between the pole post 10 and the connecting piece 20. It also reduces stress concentration in the second annular section 23, minimizing cracks and fractures caused by stress concentration, thus ensuring welding stability and reliability. Furthermore, the overlapping second annular portions 23 can form a continuous conductive path on the connecting piece 20, which can reduce the resistance change when current is transmitted on the connecting piece 20 and ensure transmission stability.

[0056] For example, such as Figure 7 and Figure 8As shown, the welding section 30 includes multiple welding sub-sections, namely a first welding sub-section 31, a second welding sub-section 32, and a third welding sub-section 33. Each welding sub-section forms a second welding trajectory segment 22 on the second welding surface 21, namely a fourth sub-welding trajectory segment 221, a fifth sub-welding trajectory segment 222, and a sixth sub-welding trajectory segment 223. The second welding trajectory 22 is a second spiral section 25, the fourth sub-welding trajectory segment 221 corresponds to the fourth sub-spiral section 251, the fifth sub-welding trajectory segment 222 corresponds to the fifth sub-spiral section 252, and the sixth sub-welding trajectory segment 223 corresponds to the sixth sub-spiral section 253. Adjacent second spiral sections 25 overlap to form overlapping areas. The overlapping of adjacent second spiral trajectory segments increases the welding area and improves the connection stability between the pole post 10 and the connecting piece 20. It also reduces stress concentration in the second spiral trajectory segment, minimizing cracks and fractures caused by stress concentration, thus ensuring welding stability and reliability. In addition, the overlapping second spiral trajectory segments can form a continuous conductive path on the connecting piece 20, which can reduce the resistance change when the current is transmitted on the connecting piece 20 and ensure transmission stability.

[0057] like Figure 8 As shown, the longitudinal section of the welding sub-part is inverted conical. During the welding process, welding is performed from the second welding surface 21. The welding sub-part passes through the connecting piece 20 along the first direction X and is embedded in the pole post 10. Corresponding first welding trajectory 12 and second welding trajectory 22 are formed on the first welding surface 11 and the second welding surface 21, and the size of the first welding trajectory 12 is smaller than the size of the second welding trajectory 22. There is a gap between adjacent segments of the first welding trajectory 12, while adjacent segments of the second welding trajectory 22 overlap with each other. This can improve the space utilization rate, ensure the connection stability of the pole post 10 and the connecting piece 20, and make full use of the characteristics of the welding sub-part, reducing the risk of the connecting piece 20 cracking from the edge of the second annular portion 23.

[0058] In some embodiments, the second welding trajectory 22 includes a second spiral portion 25 distributed along the second welding surface 21, or the second welding trajectory 22 includes a plurality of second annular portions 23 arranged substantially concentrically.

[0059] It is understandable that when the first welding trajectory 12 is the first spiral part 15, the second welding trajectory 22 corresponds to the second spiral part 25, and when the first welding trajectory 12 is a plurality of second annular parts 23 arranged basically concentrically, the second welding trajectory 22 corresponds to the second annular part 23.

[0060] The second spiral portion 25 has a similar technical effect to the first spiral portion 15, and the second annular portion 23 has a similar technical effect to the first annular portion 13, so they will not be described in detail here.

[0061] In some embodiments, such as Figure 1 and Figure 8 As shown, the terminal 10 and the connecting piece 20 are interlocked. This interlocking connection improves the connection stability of the terminal 10 and the connecting piece 20, increases their contact area, reduces contact resistance, and improves overcurrent performance. Before welding the terminal 10 and the connecting piece 20, the interlocking connection ensures their connection stability, and the subsequent welding ensures a good welding effect. By simultaneously achieving the connection between the terminal 10 and the connecting piece 20 through both interlocking and welding, the connection reliability is enhanced.

[0062] In some embodiments, such as Figure 9 and Figure 10 As shown, the pole post 10 has a groove structure 14 on the side near the connecting piece 20, and the connecting piece 20 has a protrusion structure 24 on the side near the pole post 10. The groove structure 14 and the protrusion structure 24 are interlocked and connected.

[0063] like Figure 9 and Figure 10 As shown, the terminal post 10 has a groove structure 14 on the side near the connecting piece 20, and the connecting piece 20 has a protrusion structure 24 on the side near the terminal post 10. The groove structure 14 and the protrusion structure 24 are interlocked, thus achieving an interlocking connection between the terminal post 10 and the connecting piece 20. The groove structure 14 and the protrusion structure 24 enable the terminal post 10 and the connecting piece 20 to form an interlocking connection, improving connection stability. Simultaneously, the protrusion structure 24 can be embedded within the groove structure 14, increasing the contact area between the terminal post 10 and the connecting piece 20, thereby reducing the contact resistance between the terminal post 10 and the connecting piece 20 and improving overcurrent performance.

[0064] It is understood that the pole post 10 and the connecting piece 20 can also be connected by other conventional fitting methods in the art. For example, the pole post 10 is provided with a protrusion structure 24, and the connecting piece 20 is provided with a corresponding groove structure 14.

[0065] In some embodiments, the first welding trajectory 12 includes a plurality of first annular portions 13 arranged substantially concentrically, the outline of the first annular portions 13 being polygonal or circular. When the outline of the first annular portion 13 is circular, the electromagnetic induction generated when current flows through the first annular portion 13 is small, which can ensure the stability of current transmission and reduce energy loss. In addition, the outline of the first annular portion 13 can also be polygonal, such as a regular pentagon or a regular hexagon. Polygons have similar characteristics to circles, which can also reduce electromagnetic induction, ensure the stability of current transmission, and reduce energy loss.

[0066] In some embodiments, such as Figure 2 , Figure 4 and Figure 8 As shown, the plurality of first welding trajectories 12 include a first sub-welding trajectory segment 121, a second sub-welding trajectory segment 122, and a third sub-welding trajectory segment 123 radially distributed along the first welding surface 11. The second sub-welding trajectory segment 122 is arranged around the periphery of the first sub-welding trajectory segment 121, and the third sub-welding trajectory segment 123 is arranged around the periphery of the second sub-welding trajectory segment 122. The effective penetration depth of the first welding sub-section 31 corresponding to the first sub-welding trajectory segment 121 is W1, the effective penetration depth of the second welding sub-section 32 corresponding to the second sub-welding trajectory segment 122 is W2, and the effective penetration depth of the third welding sub-section 33 corresponding to the third sub-welding trajectory segment 123 is W3, where W1 < W2 < W3.

[0067] That is, the first welding trajectory 12 includes a first sub-welding trajectory segment 121 located on the inner side, a third sub-welding trajectory segment 123 located on the outer side, and a second sub-welding trajectory segment 122 disposed between the first sub-welding trajectory segment 121 and the third sub-welding trajectory segment 123, and the first sub-welding trajectory segment 121, the second sub-welding trajectory segment 122, and the third sub-welding trajectory segment 123 are radially distributed along the first welding surface 11. By radially distributing the first sub-welding trajectory segment 121, the second sub-welding trajectory segment 122, and the third sub-welding trajectory segment 123 along the first welding surface 11, electromagnetic induction phenomena can be reduced, and the stability of current transmission between the pole post 10 and the connector can be improved.

[0068] Furthermore, the effective penetration depth W1 of the first weld sub-section 31 corresponding to the first sub-welding trajectory segment 121, the effective penetration depth W2 of the second weld sub-section 32 corresponding to the second sub-welding trajectory segment 122, and the effective penetration depth W3 of the third weld sub-section 33 corresponding to the third sub-welding trajectory segment 123 satisfy W1 < W2 < W3. That is, as the size of the sub-annular portion increases, the effective penetration depth of its corresponding weld portion 30 also gradually increases, forming a stress gradient. The third weld sub-section 33 corresponding to the third sub-welding trajectory segment 123 can absorb greater stress, the first weld sub-section 31 corresponding to the first sub-welding trajectory segment 121 provides basic support, and the second weld sub-section 32 corresponding to the second sub-welding trajectory segment 122 serves as a transition, reducing cracking caused by stress concentration. A larger effective penetration depth requires more heat input during welding, resulting in a larger heat-affected zone. By rationally setting the effective penetration depths of the first weld sub-section 31, the second weld sub-section 32, and the third weld sub-section 33, the thermal effects during welding can be balanced, reducing warping or twisting during welding.

[0069] For example, such as Figure 3As shown, the first sub-welding trajectory segment 121 is the first sub-annular portion 131, the second sub-welding trajectory segment 122 is the second sub-annular portion 132, and the third sub-welding trajectory segment 123 is the third sub-annular portion 133. All three sub-annular portions 131, 132, and 133 are annular structures. The outer diameter of the first sub-annular portion 131 is R1, the outer diameter of the second sub-annular portion 132 is R2, and the outer diameter of the third sub-annular portion 133 is R3, where R1 < R2 < R3. The annular structure of the first sub-annular portion 131, second sub-annular portion 132, and third sub-annular portion 133 helps to improve welding efficiency and reduce electromagnetic induction when current passes through them.

[0070] For example, such as Figure 5 As shown, the first sub-welding trajectory segment 121 is the first sub-spiral part 151, the second sub-welding trajectory segment 122 is the second sub-spiral part 152, and the third sub-welding trajectory segment 123 is the third sub-spiral part 153. The first sub-spiral part 151, the second sub-spiral part 152, and the third sub-spiral part 153 are distributed sequentially from the inside to the outside along the radial direction of the first welding surface 11, which helps to improve welding efficiency and reduce electromagnetic induction when current passes through.

[0071] In some embodiments, such as Figure 3 and Figure 5 As shown, the minimum distance between the first sub-welding trajectory segment 121 and the second sub-welding trajectory segment 122 is L1, and the minimum distance between the second sub-welding trajectory segment 122 and the third sub-welding trajectory segment 123 is L2, where 0.8≤L1 / L2≤1.2.

[0072] That is, the deviations between the minimum distance L1 between the first sub-welding trajectory segment 121 and the second sub-welding trajectory segment 122 and the minimum distance L2 between the second sub-welding trajectory segment 122 and the third sub-welding trajectory segment 123 are small. When the current flows through the first sub-welding trajectory segment 121, the second sub-welding trajectory segment 122 and the third sub-welding trajectory segment 123, the cancellation effect of electromagnetic induction can be guaranteed, the influence of electromagnetic induction on current transmission can be reduced, and the stability of electromagnetic induction can be improved.

[0073] For example, L1 / L2 can be 0.8, 0.9, 1.0, 1.1 or 1.2.

[0074] Secondly, embodiments of this application provide a battery including the electrode assembly described above.

[0075] The beneficial effects of the battery provided in this application embodiment compared to the prior art are basically the same as those of the electrode assembly described above, and will not be repeated here.

[0076] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A pole assembly, characterized in that, Includes poles and connecting pieces; The pole and the connecting piece are stacked along a first direction, and the pole and the connecting piece are welded together by a welding part; The pole post forms a first welding surface on the side near the connecting piece, the welding part passes through the first welding surface, and forms a first welding trajectory on the first welding surface; The first welding trajectory includes a plurality of first welding trajectory segments arranged radially at intervals along the first welding surface.

2. The pole assembly according to claim 1, characterized in that, The center of the first welding trajectory coincides with the center of the first welding surface.

3. The pole assembly according to claim 1, characterized in that, The first welding trajectory includes a first spiral portion radially distributed along the first welding surface, or the first welding trajectory includes a plurality of first annular portions arranged substantially concentrically.

4. The pole assembly according to claim 1, characterized in that, The minimum spacing between adjacent first welding trajectory segments is 0.8mm-2.0mm.

5. The pole assembly according to claim 1, characterized in that, The minimum width of the first welding trajectory is H, where 1.0 mm ≤ H ≤ 2.0 mm.

6. The pole assembly according to claim 1, characterized in that, The welding part passes through the connecting piece, and the connecting piece has a second welding surface on the side opposite to the pole post. The welding part forms a second welding trajectory on the second welding surface. The second welding trajectory includes a plurality of second welding trajectory segments that overlap radially along the second welding surface.

7. The pole assembly according to claim 6, characterized in that, The second welding trajectory includes a second spiral portion distributed along the second welding surface; Alternatively, the second welding trajectory may include a plurality of generally concentrically arranged second annular portions.

8. The pole assembly according to claim 1, characterized in that, The pole and the connecting piece are interlocked and connected.

9. The pole assembly according to claim 8, characterized in that, The pole post has a groove structure on the side near the connecting piece, and the connecting piece has a protrusion structure on the side near the pole post; The groove structure and the protrusion structure are interlocked and connected.

10. The pole assembly according to any one of claims 1-9, characterized in that, The first welding trajectory includes a plurality of first annular portions arranged concentrically, the outline shape of the first annular portions being polygonal or circular.

11. The pole assembly according to any one of claims 1-9, characterized in that, The first welding trajectory segment includes a first sub-welding trajectory segment, a second sub-welding trajectory segment, and a third sub-welding trajectory segment distributed along the first welding surface diameter. The second sub-welding trajectory segment is arranged around the periphery of the first sub-welding trajectory segment, and the third sub-welding trajectory segment is arranged around the periphery of the second sub-welding trajectory segment. The effective penetration depth of the first welding sub-section corresponding to the first sub-welding trajectory segment is W1, the effective penetration depth of the second welding sub-section corresponding to the second sub-welding trajectory segment is W2, and the effective penetration depth of the third welding sub-section corresponding to the third sub-welding trajectory segment is W3, where W1 < W2 < W3.

12. The pole assembly according to claim 11, characterized in that, The minimum distance between the first sub-welding trajectory segment and the second sub-welding trajectory segment is L1, and the minimum distance between the second sub-welding trajectory segment and the third sub-welding trajectory segment is L2, where 0.8 ≤ L1 / L2 ≤ 1.

2.

13. A battery, characterized in that, Includes the pole assembly as described in any one of claims 1-12.

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