Conductive part, cap assembly and single battery

Abstract

The utility model provides a conductive part, a cap assembly and a single battery. The conductive piece comprises an anti-explosion sheet and a pore plate; the pore plate is welded with the anti-explosion sheet to form a welding mark; the welding mark comprises a plurality of first welding mark sections, and the first welding mark sections are arranged around the center of the hole plate at intervals. According to the application, the welding marks between the anti-explosion sheet and the pore plate are arranged to be the multiple first welding mark sections arranged at intervals, so that when the welding marks are formed, the multiple first welding mark sections can be formed at the same time, or the first welding mark section on one diagonal line is firstly formed, and then the first welding mark sections on the other diagonal lines are sequentially formed. Therefore, the welding mark forming symmetry can be improved, so that the welding stress distribution uniformity of the pore plate and the anti-explosion sheet is improved, and the connection stability between the pore plate and the anti-explosion sheet can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a conductive piece, a cap assembly and a single battery. BACKGROUND

[0002] Single batteries are mainly divided into steel shell single batteries and aluminum shell single batteries according to the materials of the shells. The steel shell single battery includes a steel shell, a cover plate and an electrode assembly. The cover plate and the steel shell are mutually covered to define a mounting cavity, and the electrode assembly is arranged in the mounting cavity. The negative tab of the electrode assembly is electrically connected to the shell, and the positive tab of the electrode assembly is connected to the cover plate.

[0003] In the related art, in order to improve the stability of the current flowing between the positive tab and the cover plate and the reliability of the single battery, an explosion-proof sheet and a hole plate are arranged between the positive tab and the cover plate. The explosion-proof sheet is connected to the cap, one side of the hole plate is connected to the tab, and the middle of the other side is welded to the explosion-proof sheet, and the periphery thereof is spaced apart from the periphery of the explosion-proof sheet by an insulating gasket. The stability of the welding between the hole plate and the explosion-proof sheet is poor. CONTENT OF THE UTILITY MODEL

[0004] Embodiments of the present application provide a conductive piece, a cap assembly and a single battery, which can improve the stability of the welding between the hole plate and the explosion-proof sheet.

[0005] In a first aspect, embodiments of the present application provide a conductive piece, which includes an explosion-proof sheet and a hole plate; the hole plate is welded to the explosion-proof sheet and forms a welding mark; wherein the welding mark includes a plurality of first welding mark segments, and the plurality of first welding mark segments are arranged at intervals around the center of the hole plate.

[0006] In an embodiment, the first welding mark segment is an arc-shaped welding mark, and the center of the first welding mark segment is arranged to have a common center with the center of the hole plate.

[0007] In an embodiment, the welding mark further includes a plurality of second welding mark segments, the plurality of second welding mark segments correspond one-to-one to the plurality of first welding mark segments, and the two ends of the second welding mark segment are connected to the two ends of the corresponding first welding mark segment.

[0008] In an embodiment, the first welding mark segment and the second welding mark segment are both two, and the two first welding mark segments are centrally symmetrically distributed relative to the center of the hole plate.

[0009] In an embodiment, the minimum distance between the two second welding mark segments is L1, which satisfies: 0 < L1 ≤ 0.5 mm.

[0010] In an embodiment, the first welding mark segment is two, the welding mark further includes a third welding mark segment, the third welding mark segment is located between the two first welding mark segments, and one end of each first welding mark segment is connected to the end of the third welding mark segment.

[0011] In an embodiment, along the circumference of the hole plate, two ends of a first welding mark section are sequentially a first end and a second end, two ends of another first welding mark section are sequentially a third end and a fourth end, two ends of the third welding mark section are connected with the first end and the third end respectively, and the second end and the fourth end are both arranged at intervals from the third welding mark section.

[0012] In an embodiment, the two first welding mark sections are centrally symmetrically distributed relative to the center of the hole plate.

[0013] In an embodiment, there are two first welding mark sections, and the two first welding mark sections are centrally symmetrically distributed relative to the center of the hole plate.

[0014] In an embodiment, a notch is arranged on the hole plate, the notch is arranged around the welding mark, and the minimum distance between the welding mark and the notch is L2, satisfying 0.1mm≤L2.

[0015] In an embodiment, the width of the welding mark is 0.1mm-0.8mm.

[0016] In a second aspect, an embodiment of the present application provides a cap assembly, which comprises a cover plate, a gasket, a sealing ring, and the conductive piece described above; the cover plate is arranged on the side of the rupture disc away from the hole plate and is connected with the rupture disc; the gasket is arranged between the rupture disc and the hole plate and is arranged adjacent to the circumferences of the rupture disc and the hole plate; the inner circumference of the sealing ring is provided with a sealing groove, and the circumference of the top cover and the circumference of the rupture disc are inserted into the sealing groove.

[0017] In a third aspect, an embodiment of the present application provides a single battery, which comprises a steel shell, an electrode assembly, and the cap assembly described above; the steel shell has an opening; the electrode assembly is arranged in the steel shell; the cap assembly seals the opening; and the electrode assembly is connected with the hole plate.

[0018] The beneficial effects of the embodiments of the present application are as follows:

[0019] In the embodiments of the present application, the welding mark between the rupture disc and the hole plate is arranged as a plurality of first welding mark sections arranged at intervals, so that a plurality of first welding mark sections can be simultaneously formed when the welding mark is formed, or a first welding mark section on a diagonal line is formed first, and then the first welding mark sections on the remaining diagonal lines are sequentially formed. In this way, the symmetry of the welding mark formation can be improved, the uniformity of the welding stress distribution of the hole plate and the rupture disc can be improved, and the connection stability between the hole plate and the rupture disc can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0021] Figure 1 is a structural schematic diagram of a conductive piece provided by an embodiment of the present application;

[0022] Figure 2 is a structural schematic diagram of a welding mark provided by an embodiment of the present application;

[0023] Figure 3 is a structural schematic diagram of another welding mark provided by an embodiment of the present application;

[0024] Figure 4 is a structural schematic diagram of another welding mark provided by an embodiment of the present application;

[0025] Figure 5 is Figure 1 is an enlarged view of A in FIG. 1;

[0026] Figure 6 is a structural schematic diagram of a cap assembly provided by an embodiment of the present application;

[0027] Figure 7 is a structural schematic diagram of a single battery provided by an embodiment of the present application.

[0028] Explanation of reference signs:

[0029] 1-conductive piece;

[0030] 11-explosion-proof piece;

[0031] 12-hole plate; 121-first surface; 122-score;

[0032] 13-welding mark; 131-first welding mark segment; 132-second welding mark segment; 133-third welding mark segment; 134-first end; 135-second end; 136-third end; 137-fourth end;

[0033] 2-cap assembly; 21-cover plate; 22-gasket; 23-sealing ring; 231-sealing groove;

[0034] 3-single battery; 31-steel shell; 32-electrode assembly. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0036] In addition, it should be understood that the specific embodiments described herein are meant to be illustrative only and not limiting as to the scope of the application. In the present application, the terms "first", "second", etc., are used to describe various elements and are not used to denote or imply relative importance or a number of the indicated elements. Thus, features with "first", "second" designations can explicitly or implicitly include one or more of the features. In the description of the present application, it should be noted that unless specifically stated and limited otherwise, the terms "mounting", "connected", "connecting" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the description of the present application, it should be noted that unless specifically stated and limited otherwise, the terms "mounting", "connected", "connecting" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] The terms "comprising", "containing" or any other similar words are intended to cover non-exclusive inclusion, so that the product including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such product.

[0039] In the description of the embodiments of the present application, the words "example" or "for example" are used to mean example, illustration or description. Any embodiment or design scheme described as "example" or "for example" in the embodiments of the present application is not interpreted as more preferred or having more advantages than another embodiment or design scheme. The use of "example" or "for example" and the like is intended to present the relative concept in a clear manner.

[0040] Before introducing the conductive piece, the cap assembly and the single battery provided by the present application, the related technologies of the present application are introduced.

[0041] In the related technologies, the center of the hole plate and the center of the explosion-proof sheet are welded. When welding, the welding head is moved around a preset route for one circle, so that the welding mark formed between the hole plate and the explosion-proof sheet due to welding is a ring structure connected at the beginning and the end formed by uninterrupted welding. In this way, the symmetry of the welding mark forming mode of the hole plate and the explosion-proof sheet when welding is poor, which leads to uneven distribution of welding stress of the hole plate and the explosion-proof sheet, thereby leading to poor connection stability between the hole plate and the explosion-proof sheet.

[0042] Based on this, the embodiment of the present application provides a conductive piece, a cap assembly and a single battery to improve the symmetry of the welding imprint forming mode of the hole plate and the explosion-proof sheet during welding, so that the welding stress distribution uniformity of the hole plate and the explosion-proof sheet can be improved. Finally, the connection stability between the hole plate and the explosion-proof sheet can be improved.

[0043] The conductive piece, the cap assembly and the single battery are described in detail respectively by the following.

[0044] Please refer to Figure 1 and Figure 2 , Figure 1 is a structural schematic diagram of a conductive piece 1 provided by the embodiment of the present application, Figure 2 is a structural schematic diagram of a welding imprint 13 provided by the embodiment of the present application, and the embodiment of the present application provides a conductive piece 1. The conductive piece 1 includes an explosion-proof sheet 11 and a hole plate 12. The hole plate 12 is welded with the explosion-proof sheet 11 and forms a welding imprint 13. The welding imprint 13 includes a plurality of first welding imprint segments 131. The plurality of first welding imprint segments 131 are arranged at intervals around the center of the hole plate 12.

[0045] It can be understood that the hole plate 12 has a first surface 121 facing the explosion-proof sheet 11, and the welding imprint 13 refers to the structure exhibited by the projection on the first surface 121. The first welding imprint segment 131 can be a straight line, a curve, or a wavy line, etc.

[0046] In the embodiment, by arranging the welding imprint 13 between the explosion-proof sheet 11 and the hole plate 12 as a plurality of first welding imprint segments 131 arranged at intervals, the plurality of first welding imprint segments 131 can be simultaneously formed when the welding imprint 13 is formed, or the first welding imprint segments 131 on one diagonal line are formed first, and then the first welding imprint segments 131 on the remaining diagonal lines are sequentially formed. In this way, the symmetry of the welding imprint 13 forming can be improved, so as to improve the welding stress distribution uniformity of the hole plate 12 and the explosion-proof sheet 11, thereby improving the connection stability between the hole plate 12 and the explosion-proof sheet 11.

[0047] In addition, by arranging the welding imprint 13 between the explosion-proof sheet 11 and the hole plate 12 as a plurality of first welding imprint segments 131 arranged at intervals, the area of the heat-affected zone caused by welding can be reduced, so as to reduce the residual stress generated during welding, thereby improving the welding quality. At the same time, the width of the welding imprint 13 can be widened to ensure that the welding imprint 13 arranged at intervals has sufficient connection area to ensure the flow capacity between the hole plate 12 and the explosion-proof sheet 11. For example, the width of the welding imprint 13 can be greater than 0.5 mm.

[0048] Please refer to Figure 2In an embodiment, the first welding segment 131 is an arc-shaped welding 13, and the center of the first welding segment 131 is arranged at the same center as the center of the hole plate 12. In this way, the length of the first welding segment 131 can be increased within the same range of the center angle, so as to increase the connecting area between the hole plate 12 and the rupture disc 11, thereby improving the flow capacity between the hole plate 12 and the rupture disc 11.

[0049] Specifically, the plurality of first welding segments 131 are evenly distributed around the center of the hole plate 12.

[0050] Referring to Figure 3 , Figure 3 is another structural diagram of the welding 13 provided by the embodiments of the present application. In an embodiment, the welding 13 further includes a plurality of second welding segments 132. The plurality of second welding segments 132 correspond to the plurality of first welding segments 131 one by one. The two ends of the second welding segment 132 are connected to the two ends of the corresponding first welding segment 131. In this way, on the one hand, the length of the welding 13 can be increased, so as to increase the connecting area between the hole plate 12 and the rupture disc 11, thereby improving the flow capacity between the hole plate 12 and the rupture disc 11; on the other hand, connecting the two ends of the second welding segment 132 to the two ends of the corresponding second welding segment 132 can make the second welding segment 132 and the corresponding first welding 13 be formed by one welding head at one time, so as to ensure the forming efficiency.

[0051] Referring to Figure 3 In an embodiment, the first welding segment 131 and the second welding segment 132 are both two, and the two first welding segments 131 are centrally symmetrically distributed relative to the center of the hole plate 12. In this way, on the one hand, the force symmetry of the welding part between the hole plate 12 and the rupture disc 11 can be improved, and on the other hand, the forming difficulty of the welding 13 between the hole plate 12 and the rupture disc 11 can be reduced, so as to improve the welding efficiency.

[0052] Referring to Figure 3 In an embodiment, the minimum distance between the two second welding segments 132 is L1, and 0 < L1 ≤ 0.5 mm is satisfied.

[0053] It can be understood that the minimum distance L1 between the two second welding segments 132 includes but is not limited to 0.1 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.46 mm, and 0.5 mm.

[0054] It can be understood that when welding, the welding power of the welding head is reduced when the light is emitted and collected, and the welding power of the welding head is relatively large during the welding process. If the welding parts with relatively large welding power are overlapped, it is easy to explode and weld through.

[0055] Based on this, in the embodiment, by the above definition, on the one hand, the two second weld mark segments 132 can be avoided from overlapping, so that the welding position with large welding power on the weld mark 13 can be avoided from overlapping, so as to effectively avoid fire explosion and welding penetration; on the other hand, the spacing between the two second weld mark segments 132 can be avoided from being too large to affect the layout of the weld mark 13, so as to reduce the molding difficulty of the weld mark 13.

[0056] Please refer to Figure 4 , Figure 4 is another structure diagram of the weld mark 13 provided by the embodiment. In an embodiment, the first weld mark segment 131 has two. The weld mark 13 further comprises a third weld mark segment 133. The third weld mark segment 133 is located between the two first weld mark segments 131, and one end of each first weld mark segment 131 is connected with the end of the third weld mark segment 133. In this way, the length of the weld mark 13 can be increased, so as to increase the connecting area between the hole plate 12 and the rupture disc 11, thereby improving the flow capacity between the hole plate 12 and the rupture disc 11.

[0057] Please refer to Figure 4 In an embodiment, along the circumference of the hole plate 12, the two ends of one first weld mark segment 131 are sequentially the first end 134 and the second end 135, the two ends of the other first weld mark segment 131 are sequentially the third end 136 and the fourth end 137, the two ends of the third weld mark segment 133 are connected with the first end 134 and the third end 136 respectively, and the second end 135 and the fourth end 137 are both spaced apart from the third weld mark segment 133. In this way, the weld mark 13 can be formed by welding once through the welding head, so as to ensure the molding efficiency.

[0058] In addition, the second end 135 and the fourth end 137 are both spaced apart from the third weld mark segment 133, so that the welding position with large welding power on the weld mark 13 can be avoided from overlapping, so as to effectively avoid fire explosion and welding penetration, thereby ensuring the welding quality.

[0059] Please refer to Figure 4 In an embodiment, the two first weld mark segments 131 are centrally symmetrically distributed relative to the center of the hole plate 12. In this way, on the one hand, the force symmetry of the welding position between the hole plate 12 and the rupture disc 11 can be improved, and on the other hand, the molding difficulty of the weld mark 13 between the hole plate 12 and the rupture disc 11 can be reduced, so as to improve the welding efficiency.

[0060] Please refer to Figure 2 In an embodiment, the first weld mark segment 131 has two, and the two first weld mark segments 131 are centrally symmetrically distributed relative to the center of the hole plate 12. In this way, on the one hand, the force symmetry of the welding position between the hole plate 12 and the rupture disc 11 can be improved, and on the other hand, the molding difficulty of the weld mark 13 between the hole plate 12 and the rupture disc 11 can be reduced, so as to improve the welding efficiency.

[0061] Please refer to Figure 5 , Figure 5 is Figure 1 is an enlarged view of A in FIG. 1. In an embodiment, the hole plate 12 is provided with a notch 122, the notch 122 is arranged around the welding mark 13, and the minimum distance L2 between the welding mark 13 and the notch 122 satisfies: 0.1mm≤L2.

[0062] It can be understood that the notch 122 is a weak part on the hole plate 12, which is configured to break when the internal pressure of the single battery 3 is too high, so as to disconnect the internal circuit of the battery and slow down the thermal runaway.

[0063] Based on this, in the embodiment, by the above limitation, the welding mark 13 and the notch 122 have sufficient distance to avoid the notch 122 from being invalid due to the overlap of the welding mark 13 and the notch 122, so as to improve the reliability of the single battery 3.

[0064] Specifically, 0.1mm≤L2≤1mm, so that the welding mark 13 has a larger layout area to improve the connection area between the hole plate 12 and the explosion-proof sheet 11, so as to improve the overcurrent energy.

[0065] In an embodiment, the width of the welding mark 13 is 0.1mm-0.8mm.

[0066] It can be understood that the width of the welding mark 13 can be 0.1mm, 0.15mm, 0.2mm, 0.28mm, 0.32mm, 0.34mm, 0.38mm, 0.4mm, 0.41mm, 0.45mm, 0.5mm, 0.52mm, 0.6mm, 0.65mm, 0.7mm, 0.8mm.

[0067] In the embodiment, by limiting the width of the welding mark 13, on the one hand, the welding between the hole plate 12 and the explosion-proof sheet 11 is reliable, and on the other hand, the welding mark 13 is prevented from being too wide to affect the setting of the welding track.

[0068] Based on the above embodiment, the conductive part 1 provided by the present application is described as follows.

[0069] Please refer to Figure 2The conductive piece 1 provided by the embodiment of the present application comprises an explosion-proof sheet 11 and a hole plate 12. The hole plate 12 is welded with the explosion-proof sheet 11 and forms a welding mark 13. The hole plate 12 has a first surface 121 facing the explosion-proof sheet 11. The welding mark 13 comprises a plurality of first welding mark segments 131. The plurality of first welding mark segments 131 are arranged at intervals around the center of the hole plate 12. The plurality of first welding mark segments 131 are arc-shaped welding mark 13, and the centers of the plurality of first welding mark segments 131 are arranged to be co-centric with the center of the hole plate 12. There are two first welding mark segments 131, and the two first welding mark segments 131 are centrally symmetrically distributed relative to the center of the hole plate 12. The hole plate 12 is provided with a notch 122, the notch 122 is arranged around the welding mark 13, and the minimum distance between the welding mark 13 and the notch 122 is L2, which satisfies: 0.1mm≤L2. The width of the welding mark 13 is 0.1mm-0.8mm.

[0070] Please refer to Figure 3 The conductive piece 1 provided by the embodiment of the present application comprises an explosion-proof sheet 11 and a hole plate 12. The hole plate 12 is welded with the explosion-proof sheet 11 and forms a welding mark 13. The hole plate 12 has a first surface 121 facing the explosion-proof sheet 11. The welding mark 13 comprises a plurality of first welding mark segments 131 and a plurality of second welding mark segments 132. The plurality of first welding mark segments 131 are arranged at intervals around the center of the hole plate 12. The plurality of first welding mark segments 131 are arc-shaped welding mark 13, and the centers of the plurality of first welding mark segments 131 are arranged to be co-centric with the center of the hole plate 12. The plurality of second welding mark segments 132 correspond to the plurality of first welding mark segments 131 one by one. The two ends of the second welding mark segment 132 are connected with the two ends of the corresponding first welding mark segment 131. There are two first welding mark segments 131 and two second welding mark segments 132, and the two first welding mark segments 131 are centrally symmetrically distributed relative to the center of the hole plate 12. The minimum distance between the two second welding mark segments 132 satisfies: 0

[0071] Please refer to Figure 4The conductive piece 1 provided by the embodiments of the present application further includes an explosion-proof sheet 11 and a hole plate 12. The hole plate 12 is welded with the explosion-proof sheet 11 and forms a welding mark 13. The hole plate 12 has a first surface 121 facing the explosion-proof sheet 11. The welding mark 13 includes a plurality of first welding mark segments 131 and a plurality of third welding mark segments 133. The plurality of first welding mark segments 131 are arranged at intervals around the center of the hole plate 12. The plurality of first welding mark segments 131 are arc-shaped welding mark 13, and the centers of the plurality of first welding mark segments 131 are arranged to have a common center with the center of the hole plate 12. There are two first welding mark segments 131, and the two first welding mark segments 131 are centrally symmetrically distributed relative to the center of the hole plate 12. The welding mark 13 further includes the third welding mark segment 133. The third welding mark segment 133 is located between the two first welding mark segments 131, and one end of each of the first welding mark segments 131 is connected to the end of the third welding mark segment 133. Along the circumference of the hole plate 12, the two ends of one of the first welding mark segments 131 are sequentially a first end 134 and a second end 135, the two ends of the other of the first welding mark segments 131 are sequentially a third end 136 and a fourth end 137, the two ends of the third welding mark segment 133 are connected with the first end 134 and the third end 136 respectively, and the second end 135 and the fourth end 137 are arranged at intervals from the third welding mark segment 133. The hole plate 12 is provided with a notch 122, the notch 122 is arranged around the welding mark 13, and the minimum distance between the welding mark 13 and the notch 122 is L2, which satisfies: 0.1mm≤L2. The width of the welding mark 13 is 0.1mm-0.8mm.

[0072] Please refer to Figure 6 , Figure 6 is a structural schematic diagram of the cap assembly 2 provided by the embodiments of the present application, and accordingly, the embodiments of the present application provide a cap assembly 2. The cap assembly 2 includes a cover plate 21, a gasket 22, a sealing ring 23, and the conductive piece 1 provided by some embodiments of the present application. The cover plate 21 is located on the side of the explosion-proof sheet 11 away from the hole plate 12 and is connected with the explosion-proof sheet 11. The gasket 22 is arranged between the explosion-proof sheet 11 and the hole plate 12 and is arranged adjacent to the circumferential edges of the explosion-proof sheet 11 and the hole plate 12. The inner circumferential surface of the sealing ring 23 is provided with a sealing groove 231. The circumferential edge of the top cover and the circumferential edge of the explosion-proof sheet 11 are inserted into the sealing groove 231. The hole plate 12 is provided with a notch 122, the notch 122 is arranged around the welding mark 13, and the minimum distance between the welding mark 13 and the notch 122 is L2, which satisfies: 0.1mm≤L2.

[0073] It can be understood that the circumferential edge of the cover plate 21 abuts against the circumferential edge of the explosion-proof sheet 11 to realize the conductive connection therebetween.

[0074] In the embodiment, by adopting the conductive piece 1 provided by some embodiments of the present application, the welding marks 13 between the explosion-proof sheet 11 and the hole plate 12 are arranged as a plurality of first welding mark segments 131 arranged at intervals, so that a plurality of first welding mark segments 131 can be respectively and simultaneously formed when the welding marks 13 are formed, or the first welding mark segments 131 on one diagonal line are formed first, and then the first welding mark segments 131 on the remaining diagonal lines are sequentially formed. In this way, the symmetry of the welding marks 13 can be improved, so that the welding stress distribution uniformity of the hole plate 12 and the explosion-proof sheet 11 can be improved, thereby the connection stability between the hole plate 12 and the explosion-proof sheet 11 can be improved. Finally, the structural reliability of the cap assembly 2 can be improved.

[0075] Please refer to Figure 7 , Figure 6 is a structural schematic diagram of a single battery 3 provided by the embodiments of the present application, and accordingly, the embodiments of the present application provide a single battery 3. The single battery 3 includes a steel shell 31, an electrode assembly 32, and the aforementioned cap assembly 2. The steel shell 31 has an opening. The electrode assembly 32 is arranged in the steel shell 31. The cap assembly 2 seals the opening. The electrode assembly 32 is connected with the hole plate 12.

[0076] It can be understood that the electrode assembly 32 includes a positive electrode sheet, a separator, and a negative electrode sheet which are stacked and arranged in a roll shape. The positive electrode sheet is electrically connected with the hole plate 12 through a positive electrode tab, and the negative electrode sheet is electrically connected with the steel shell 31 through a negative electrode tab.

[0077] In the embodiment, by adopting the cap assembly 2 provided by some embodiments of the present application, the welding marks 13 between the explosion-proof sheet 11 and the hole plate 12 are arranged as a plurality of first welding mark segments 131 arranged at intervals, so that a plurality of first welding mark segments 131 can be respectively and simultaneously formed when the welding marks 13 are formed, or the first welding mark segments 131 on one diagonal line are formed first, and then the first welding mark segments 131 on the remaining diagonal lines are sequentially formed. In this way, the symmetry of the welding marks 13 can be improved, so that the welding stress distribution uniformity of the hole plate 12 and the explosion-proof sheet 11 can be improved, thereby the connection stability between the hole plate 12 and the explosion-proof sheet 11 can be improved. Finally, the structural reliability of the single battery 3 can be improved.

[0078] The embodiments of the present application are described in detail above, and specific examples are applied in this paper to describe the principles and implementation modes of the present application; the above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation modes and application ranges will be changed, and the above description of the present application should not be understood as a limitation.

Claims

1. A conductive element, characterized in that, include: Explosion-proof sheet; The perforated plate is welded to the explosion-proof sheet to form a weld mark; The solder mark includes a plurality of first solder mark segments, which are spaced apart around the center of the orifice plate.

2. The conductive element according to claim 1, characterized in that, The first solder mark segment is an arc-shaped solder mark, and the center of the first solder mark segment is set to be the same as the center of the orifice plate.

3. The conductive element according to claim 2, characterized in that, The solder mark also includes a plurality of second solder mark segments, each of which corresponds one-to-one with a plurality of first solder mark segments, and the two ends of the second solder mark segment are connected to the two ends of the corresponding first solder mark segment.

4. The conductive element according to claim 3, characterized in that, There are two of each of the first and second solder marks, and the two first solder marks are centrally symmetrically distributed with respect to the center of the orifice plate.

5. The conductive element according to claim 4, characterized in that, The minimum spacing between the two second solder marks is L1, which satisfies: 0 < L1 ≤ 0.5 mm.

6. The conductive element according to claim 2, characterized in that, There are two first solder stamp segments, and the solder stamp also includes a third solder stamp segment. The third solder stamp segment is located between the two first solder stamp segments, and one end of each first solder stamp segment is connected to the end of the third solder stamp segment.

7. The conductive element according to claim 6, characterized in that, Along the circumference of the orifice plate, one of the first soldering segments has two ends, namely a first end and a second end, and the other first soldering segment has two ends, namely a third end and a fourth end, with the two ends of the third soldering segment connected to the first end and the third end respectively. The second end and the fourth end are both spaced apart from the third soldering segment.

8. The conductive element according to claim 6, characterized in that, The two first solder marks are centrally symmetrically distributed with respect to the center of the orifice plate.

9. The conductive element according to claim 2, characterized in that, There are two first solder marks, and the two first solder marks are centrally symmetrically distributed with respect to the center of the orifice plate.

10. The conductive element according to any one of claims 1-9, characterized in that, The perforated plate is provided with grooves that surround the solder mark. The minimum distance between the solder mark and the groove is L2, which satisfies: 0.1mm≤L2.

11. The conductive element according to any one of claims 1-9, characterized in that, The width of the solder mark is 0.1mm to 0.8mm.

12. A cap assembly, characterized in that, include: The conductive element as described in any one of claims 1-11; A cover plate is located on the side of the explosion-proof sheet opposite to the perforated plate and is connected to the explosion-proof sheet; A gasket is disposed between the explosion-proof sheet and the perforated plate, and is disposed adjacent to the periphery of the explosion-proof sheet and the perforated plate; The sealing ring has a sealing groove on its inner circumferential surface, and the periphery of the cover plate and the periphery of the explosion-proof sheet are inserted into the sealing groove.

13. A single-cell battery, characterized in that, include: Steel shell with openings; Electrode assembly, disposed within the steel shell; And, as described in claim 12, the cap assembly seals the opening; The electrode assembly is connected to the orifice plate.

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