Connecting piece, cover plate assembly and battery
By designing through holes and protruding hole walls on the connecting piece, the problem of laser damage to the sealing ring caused by the gap between the pole and the connecting piece is solved, achieving a good fit and improved welding quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2026-03-20
AI Technical Summary
During the laser welding process of lithium-ion batteries, the radial gap between the electrode post and the connecting piece causes the laser beam to pass through and damage the sealing ring, affecting the welding quality.
A through hole is provided on the connecting piece. The through hole has a first channel and a second channel. The wall of the second channel protrudes radially toward the center of the through hole to form a shielding part. The pole is deformed during riveting to reduce the radial gap and to block the leakage or escaping laser through the shielding part.
It effectively reduces radial fit clearance, prevents laser damage to the sealing ring, improves welding quality, prevents sealing ring ablation, and enhances structural strength.
Smart Images
Figure CN224020998U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery manufacturing technical field, concretely relates to a connecting piece, cover plate subassembly and battery. BACKGROUND
[0002] In lithium ion battery, the cover plate subassembly is the key part of guaranteeing the battery leakproofness, safety and reliability, the cover plate subassembly usually includes pole, sealing ring, connecting piece and the like structure, wherein the sealing performance between pole and connecting piece directly influences the battery leakproofness and long-term stability.
[0003] In related technology, due to processing error, assembly error or other matching reasons, pole and connecting piece often exist certain radial clearance at matching area, when pole and connecting piece are laser welded, laser beam is easy to penetrate radial clearance and is irradiated to sealing ring after reflection, leading to that sealing ring is locally ablated seriously, even generates a large amount of gas, influences welding quality. UTILITY MODEL CONTENT
[0004] Therefore, the utility model provides a connecting piece, cover plate subassembly and battery to solve the problem that laser beam is easy to damage sealing ring through radial clearance between pole and connecting piece in the laser welding process.
[0005] Firstly, the utility model provides a connecting piece, and the connecting piece includes a main body, and the main body is provided with a through hole; the through hole includes at least a first hole channel and a second hole channel which are arranged in axial communication; wherein the hole wall of the second hole channel is arranged protrudingly in the radial direction relative to the hole wall of the first hole channel to form a shielding part.
[0006] Beneficial effects: by arranging the through hole on the connecting piece, the protruding (hole wall of the second hole channel) and recessed (hole wall of the first hole channel) shape features of the through hole are used to make the corresponding pole segment of the pole deform during riveting, so that good cooperation is formed between the through hole of the connecting piece and the pole, the radial cooperation clearance is effectively reduced, the effect of isolating laser is achieved, the shielding part at the through hole can also block the leakage laser or scattered laser, double protection is provided to prevent laser from damaging the sealing ring, and the welding quality is improved.
[0007] In an alternative embodiment, in the radial direction, the diameter of the first hole channel is R1, and the diameter of the second hole channel is R2, the value range of R1 is 5mm
[0008] In an alternative embodiment, the diameter R1 of the first hole channel and the diameter R2 of the second hole channel satisfy 0.75
[0009] Beneficial effect: the diameter R1 of the first hole and the diameter R2 of the second hole satisfy 0.75 < R2 / R1 < 1, so that the height of the shielding part (the height of the hole wall of the second hole protruding radially towards the center of the through hole relative to the hole wall of the first hole) is sufficient to form an effective riveting section while avoiding the height of the shielding part being too high, which would result in the riveting section not being fully filled relative to the first hole, affecting the cooperation between the riveting section and the through hole.
[0010] In an optional embodiment, in the axial direction, the height of the first hole is H1, and the height of the second hole is H2, H1 is in the range of 1mm≤H1≤2mm, and H2 is in the range of 0.5mm≤H2≤1.5mm.
[0011] In an optional embodiment, the height H1 of the first hole and the height H2 of the second hole satisfy 0.25≤H2 / H1≤1.5.
[0012] Beneficial effect: the height H1 of the first hole and the height H2 of the second hole satisfy 0.25≤H2 / H1≤1.5, so that the length of the riveting section relative to the overall length of the pole is sufficient to ensure stable riveting between the pole and the connecting piece while avoiding the riveting section being too long, which would result in material waste, increased assembly difficulty, and other defects, ensuring good cooperation between the pole and the through hole.
[0013] In an optional embodiment, the main body includes a sheet body, a protruding part protruding from one side surface of the sheet body, and a flange connected to the protruding part away from the sheet body; the through hole penetrates the sheet body, the protruding part, and the flange, and forms the first hole corresponding to the sheet body and the protruding part and the second hole corresponding to the flange; and / or, the hole wall of the second hole is a straight surface or an arc surface protruding towards the center of the through hole; and / or, a hole-in-step is formed at the connection between the first hole and the second hole; the hole-in-step has a first step surface, and the first step surface is provided with a light-absorbing layer.
[0014] Beneficial effect: in the forming process of the connecting piece, the top of the material to be formed is pressed, and in the traditional scheme, the material flows towards the edge of the connecting piece, the material flows in a single direction, and the stress is concentrated. In the present scheme, the wall of the flange protrudes radially relative to the wall of the protruding part, the material accumulates at the flange, increases the resistance of the material flowing towards the edge of the connecting piece, limits the flow of the material towards the edge of the connecting piece, and makes part of the material flow towards the direction close to the through hole. The material flows in two directions to reduce stress and improve structural strength.
[0015] Beneficial effects: By setting the light-absorbing layer at the first step surface, the stray light will directly irradiate on the light-absorbing layer, and the light-absorbing layer will efficiently absorb the energy of the stray light or the escaped light, thereby avoiding damage of the sealing ring by the stray light or the escaped light and protecting the first step surface from the laser.
[0016] In a second aspect, the utility model also provides a cover plate assembly, it includes: cover plate, set up the pole hole, the connecting piece of any one of above-mentioned, the side corresponding to the cover plate is provided, the through -hole is connected with the pole hole The communication is provided, the pole is passed in the pole hole and the through -hole, the outer peripheral wall of pole and the hole wall of through -hole are matched, the second hole is set up close to the cover plate relative to the first hole.
[0017] In an alternative embodiment, the pole includes a main body segment and a riveting segment connected along the axial direction, the hole wall of the second hole is matched with the outer peripheral wall of the main body segment, and the riveting segment is arranged in the first hole, and the outer peripheral wall of the riveting segment is matched with the hole wall of the first hole.
[0018] Beneficial effects: The riveting segment, i.e. the deformed segment, of the pole is tightly matched with the first hole, reducing the radial gap to microns, greatly increasing the difficulty of laser transmission through the gap, and isolating the laser penetration path; the second step surface and the shielding part jointly block the stray light or the escaped light, the shielding part and the pole step achieve the effect of blocking the laser at double corners, the stray light or the escaped light is reflected and scattered multiple times, providing a double protection effect, effectively avoiding direct irradiation of the laser on the sealing ring, and reducing the risk of ablation; after the shielding part is arranged in the through hole, the material flows in two directions during extrusion molding, the outward flow is the traditional path along the center to the outer edge of the through hole, and the inward flow is the flow towards the center of the through hole, so that the stress distribution is more uniform, and cracks or warping caused by local stress concentration are avoided.
[0019] In an alternative embodiment, the main body segment includes at least a first segment and a second segment connected along the axial direction, the first segment is connected with the riveting segment, the second segment is connected to one end of the first segment away from the riveting segment, the hole wall of the second hole is matched with the outer peripheral wall of the first segment, the outer peripheral wall of the second segment extends out of the outer peripheral wall of the first segment in a direction away from the center of the through hole, and a pole step is formed at the connection between the first segment and the second segment, the pole step has a second step surface.
[0020] In a third aspect, the utility model also provides a battery comprising the cover plate assembly as described in any one of the above. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.
[0022] Figure 1 It is a structure schematic view of the connecting piece of the present application.
[0023] Figure 2 It is a front view of the connecting piece of the present application.
[0024] Figure 3 It is a sectional view of A-A in the present application. Figure 2
[0025] Figure 4 It is a schematic view before riveting of the pole of the present application.
[0026] Figure 5 It is a schematic view after riveting of the pole of the present application.
[0027] Figure 6 It is a top view of the cover plate assembly of the present application.
[0028] Figure 7 It is a sectional view of B-B in the present application. Figure 6
[0029] It is an enlarged schematic view of D in the present application. Figure 8 Figure 7 It is a sectional view of C-C in the present application.
[0030] Figure 9 Figure 6 It is a structure schematic view of the cover plate assembly of the present application.
[0031] Figure 10 It is a schematic view of another embodiment of the connecting piece of the present application. Figure 10
[0032] It is a schematic view of still another embodiment of the connecting piece of the present application. Figure 11
[0033] Figure 12
[0034] Explanation of reference signs:
[0035] 1, connecting piece; 11, through hole; 111, first hole channel; 112, second hole channel; 113, third hole channel; 12, shielding part; 121, first step surface; 13, piece body; 14, protruding part; 141, flange.
[0036] 2, pole post; 21, riveting section; 22, second section; 23, pole post step; 24, second step surface; 25, matching section; 26, first section; 27, main body section; 28, end head;
[0037] 3, lower insulating piece;
[0038] 4, cover plate; 41, pole post hole;
[0039] 5, sealing ring; 51, first ring body; 52, second ring body;
[0040] 6, upper insulating piece. DETAILED DESCRIPTION
[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.
[0042] In the description of the present application, it should be noted that the directions or position relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like are based on the directions or position relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting or implying that the devices or elements indicated must have a particular direction, be constructed and operated in a particular direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0043] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.
[0044] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.
[0045] The following will be described in combination with Figures 1 to 12The embodiment of the utility model discloses.
[0046] According to the embodiment of the utility model, on the one hand, a connecting sheet 1 is provided, the connecting sheet 1 includes a main body, the main body is provided with a through hole 11, the through hole 11 includes at least a first hole 111 and a second hole 112 which are arranged in axial communication, wherein the hole wall of the second hole 112 is arranged protrudingly in the radial direction relative to the hole wall of the first hole 111 and towards the center of the through hole 11 to form a shielding part 12.
[0047] It should be noted that by arranging the first hole 111 and the second hole 112 in the through hole 11 and arranging the hole wall of the second hole 112 protrudingly in the radial direction relative to the hole wall of the first hole 111 and towards the center of the through hole 11 to form the shielding part 12, when the pole post 2 is riveted with the connecting sheet 1, the pole post 2 is deformed due to the riveting pressure, and the pole post 2 is arranged protrudingly in the direction close to the hole wall of the first hole 111 to form a riveting section 21, the riveting section 21 is closely matched with the first hole 111, so that the radial clearance between the pole post 2 and the through hole 11 is greatly reduced, and since the smaller the clearance is, the more difficult the laser beam passes, most of the laser beam is directly shielded by the wall body at the opening of the first hole 111 and the end surface wall body of the riveting section 21 close to the opening of the first hole 111, so that the laser passing and the sealing ring 5 are isolated, in addition, the shielding part 12 can reflect the leaked or scattered laser away from the sealing ring 5, so that the laser is blocked and the sealing ring 5 is protected, and the welding quality is improved.
[0048] In the embodiment, by arranging the through hole 11 at the connecting sheet 1 and by means of the protruding (hole wall of the second hole 112) and recessed (hole wall of the first hole 111) shape features of the through hole 11, the corresponding pole post section 2 is deformed during riveting to form a good fit between the through hole 11 of the connecting sheet 1 and the pole post 2, effectively reducing the radial fit clearance, achieving the effect of isolating the laser, and the shielding part 12 at the through hole 11 can also block the leaked or scattered laser, double protection is provided to prevent the laser from damaging the sealing ring 5, and the welding quality is improved.
[0049] In some embodiments, in combination Figure 3 As shown in the figure, in the radial direction, the diameter of the first hole 111 is R1, and the diameter of the second hole 112 is R2, the value range of R1 is 5mm < R1 < 37mm, and the value range of R2 is 5mm ≤ R2 ≤ 35mm.
[0050] It can be understood that the value of R1 is greater than the value of R2.
[0051] Optionally, R1 can be any one of 5.1 mm, 6 mm, 10 mm, 15 mm, 20 mm, 30 mm, 36 mm, 36.9 mm, or any value between any two of them.
[0052] Optionally, R2 can be any one of 5 mm, 10 mm, 15 mm, 20 mm, 30 mm, 35 mm, or any value between any two of them.
[0053] In some embodiments, in combination with Figure 3 As shown, the diameter R1 of the first hole 111 and the diameter R2 of the second hole 112 satisfy 0.75 < R2 / R1 < 1. In this way, the height of the shielding portion 12 (the height of the hole wall of the second hole 112 protruding radially towards the center of the through hole 11 relative to the hole wall of the first hole 111) is sufficient to form the effective riveting section 21, while avoiding the defect that the riveting section is not fully filled relative to the first hole, affecting the cooperation between the riveting section 21 and the through hole 11, due to the height of the shielding portion 12 being too high.
[0054] It is worth noting that if R2 / R1 < 0.75, the diameter of the second hole 112 is too small relative to the diameter of the first hole 111, resulting in the height of the shielding portion 12 being too high, which in turn makes the riveting section 21 prone to exceeding the material deformation limit when deformed, and prone to structural defects such as cracks; if R2 / R1 > 1, i.e. the diameter of the second hole 112 is greater than the diameter of the first hole 111, the hole wall of the first hole 111 is protruding radially towards the center of the through hole 11 relative to the hole wall of the second hole 112, i.e. the concave side is the second hole 112 and the convex side is the first hole 111, at this time the pole section corresponding to the concave side on the pole 2 is located in the middle part of the pole 2, since in the riveting process, the end of the riveting part is usually deformed by upsetting to achieve connection, therefore the middle pole section (corresponding to the concave side) of the pole 2 is difficult to deform fully to fill the second hole 112 during riveting, thereby affecting the connection strength and cooperation precision.
[0055] Optionally, R2 / R1 can be any one of 0.76, 0.82, 0.88, 0.94, 0.99, or any value between any two of them.
[0056] In some embodiments, in combination with Figure 3 As shown, in the axial direction, the height of the first hole 111 is H1, and the height of the second hole 112 is H2, the value range of H1 is 1 mm ≤ H1 ≤ 2 mm, and the value range of H2 is 0.5 mm ≤ H2 ≤ 1.5 mm.
[0057] Optionally, H1 can be any one of 1 mm, 1.3 mm, 1.5 mm, 2 mm, or any value between any two of them.
[0058] Optionally, the value of H2 can be any value in 0.5mm, 0.7mm, 1mm, 1.5mm, or a value between any two values.
[0059] In some embodiments, in combination with Figure 3 As shown in the figure, the height H1 of the first hole 111 and the height H2 of the second hole 112 satisfy 0.25≤H2 / H1≤1.5; in this way, the length of the riveting section 21 relative to the whole of the pole 2 is sufficient to ensure stable riveting between the pole 2 and the connecting sheet 1, while avoiding defects such as material waste and increased assembly difficulty caused by the riveting section 21 being too long, and ensuring good cooperation between the pole 2 and the through hole 11.
[0060] It is worth noting that if H2 / H1<0.25, the length of the first hole 111 relative to the second hole 112 in the axial direction is too long, which will result in the need for higher riveting pressure during riveting, which is prone to cause substrate deformation, and if H2 / H1>1.5, the length of the first hole 111 relative to the second hole 112 in the axial direction is too short, which will result in the load being concentrated on the end of the pole 2 during riveting, which is prone to cause defects such as cracks.
[0061] Optionally, the value of H2 / H1 can be any value in 0.25, 0.3, 0.35, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.5, or a value between any two values.
[0062] In some embodiments, in combination with Figure 3 As shown in the figure, the main body includes a sheet body 13, a protruding portion 14, and a flange 141, the protruding portion 14 is protrudingly arranged on one side surface of the sheet body 13, the flange 141 is connected to the side of the protruding portion 14 away from the sheet body 13, the through hole 11 penetrates the sheet body 13, the protruding portion 14, and the flange 141, and forms the first hole 111 corresponding to the sheet body 13 and the protruding portion 14, and forms the second hole 112 corresponding to the flange 141.
[0063] Specifically, in combination with Figure 3 As shown in the figure, the wall of the flange 141 at the through hole 11 is protrudingly arranged in a direction close to the center of the through hole 11 relative to the protruding portion 14, so as to form the shielding portion 12.
[0064] Specifically, in combination with Figure 3As shown, the first hole 111 is arranged corresponding to the protruding part 14 and the sheet 13, so that when the partial column segment of the pole 2 is riveted with the first hole 111 of the connecting sheet 1, the riveting pressure is borne by the sheet 13, and the overall structural stability is ensured; the second hole 112 is arranged corresponding to the flange 141, the wall of the flange 141 is arranged protruding in the radial direction away from the center of the through hole 11 relative to the wall of the protruding part 14, forming the mounting position of the sealing ring 5, and the second hole 112 is arranged close to the sealing ring 5 relative to the first hole 111.
[0065] In this embodiment, in the forming process of the connecting sheet 1, the top of the material to be formed is pressed, and in the traditional scheme, the material flows to the edge of the connecting sheet 1, the material flows in a single direction, and the stress is concentrated, and in this scheme, because the wall of the flange 141 is arranged protruding in the radial direction relative to the wall of the protruding part 14, the material is accumulated at the flange 141, the resistance of the material flowing to the edge of the connecting sheet 1 is increased, the flow of the material to the edge of the connecting sheet 1 is limited, and part of the material flows in the direction close to the through hole 11, the material flows in two directions to reduce the stress and improve the structural strength.
[0066] In some embodiments, in combination with Figure 3 As shown, the hole wall of the second hole 112 is a straight surface, which can be but is not limited to a cylindrical hole.
[0067] In some embodiments, in combination with Figure 12 As shown, the hole wall of the second hole 112 is an arc surface arranged protruding towards the center of the through hole 11, and the scattered or escaped laser light will be scattered on the arc convex surface, further dissipating the laser energy.
[0068] In some embodiments, in combination with Figure 11 As shown, the hole further includes a third hole 113, the third hole 113 is arranged on the side of the first hole 111 away from the second hole 112, and the hole wall of the first hole 111 is arranged protruding in the radial direction towards the center of the through hole 11 relative to the hole wall of the third hole 113, to form another shielding part 12, when the pole 2 is riveted with the connecting sheet 1, the column segment of the pole corresponding to the third hole 113 is deformed and arranged protruding in the direction close to the hole wall of the third hole 113, and the column segment of the pole corresponding to the first hole 111 is deformed and arranged protruding in the direction close to the hole wall of the first hole 111, so that the pole 2 is arranged in cooperation with the through hole 11.
[0069] In some embodiments, a hole inner step is formed at the connection between the first hole 111 and the second hole 112; the hole inner step has a first step surface 121, and a light-absorbing layer is arranged at the first step surface 121, which can be but is not limited to a ceramic composite material, and the light-absorbing layer is arranged on the first step surface 121 to absorb the scattered or escaped laser light.
[0070] In the embodiment, by arranging the light-absorbing layer at the first step surface 121, the stray light can directly irradiate on the light-absorbing layer, and the light-absorbing layer can efficiently absorb the energy of the stray light or the escaped light, so as to avoid damage of the sealing ring by the stray light or the escaped light, and protect the first step surface 121 from the laser.
[0071] In a second aspect, the utility model also provides a cover plate assembly, include: cover plate 4, open have pole hole 41, the connecting piece 1 of any one, set up correspondingly one side of cover plate 4, the through hole 11 with pole hole 41 intercommunication set up, pole 2, pass in pole hole 41 and through hole 11, the outer circumferential wall of pole 2 and the hole wall of through hole 11 are adapted, and the second hole 112 is set up close to cover plate 4 relative to first hole 111.
[0072] Combining Figure 5 As shown, the pole 2 includes a main body segment 27 and a riveting segment 21 connected in the axial direction, the main body segment 27 includes at least a first segment 26 and a second segment 22 connected in the axial direction, the hole wall of the second hole 112 is matched with the outer circumferential wall of the main body segment 27, the riveting segment 21 is arranged in the first hole 111, and the outer circumferential wall of the riveting segment 21 is matched with the hole wall of the first hole 111.
[0073] It should be noted that the sealing ring 5 includes a first ring body 51 and a second ring body 52 arranged integrally, the first ring body 51 is sleeved on the circumferential side of the second segment 22 and located on the surface of the flange 141 of the connecting piece 1, and the second ring body 52 is sleeved on the circumferential side of the protruding portion 14 and the flange 141.
[0074] It should be noted that the pole 2 is divided into a positive pole and a negative pole, Figure 7 As shown in the drawing, the positive pole is matched with the connecting piece 1, Figure 9 As shown in the drawing, the negative pole is matched with the connecting piece 1, wherein the material of the positive pole is metal, and the positive pole can be directly connected with the connecting piece 1 to conduct electricity, the negative pole further includes a conductive adapter sleeve for transmitting the current at the non-metal pole to the connecting piece 1, and the conductive adapter sleeve at the negative pole is riveted and matched with the through hole 11.
[0075] The specific matching process of the pole 2 and the connecting piece 1 is that the connecting piece 1 is arranged on one side of the cover plate 4, the through hole 11 at the connecting piece 1 is arranged opposite to the pole hole 41 at the cover plate 4, the pole 2 passes through the pole hole 41 from the side of the cover plate 4 away from the connecting piece 1 and is inserted into the through hole 11, the main body section 27 of the pole 2 is attached to the hole wall of the second hole channel 112, before riveting, the pole 2 is arranged spaced apart from the hole wall of the first hole channel 111 corresponding to the first hole channel 111, and then riveting is performed, the pole 2 is subjected to riveting pressure, so that the pole 2 corresponding to the first hole channel 111 is extended in the radial direction and protrudes towards the hole wall of the first hole channel 111, is deformed, forms the riveting section 21 matched with the first hole channel 111, the riveting section 21 is closely matched with the first hole channel 111, so that the matching gap of the pole 2 and the through hole 11 in the radial direction is greatly reduced, and because the smaller the gap is, the more difficult the laser beam passes, most of the laser beam is directly shielded by the structure, thereby playing a role of isolating the laser from passing through, preventing the laser from damaging the second ring body 52 of the sealing ring 5, in addition, the shielding part 12 can reflect the leaked or scattered laser towards the direction away from the sealing ring 5, plays a role of shielding the laser and protecting the sealing ring 5, prevents the laser beam from damaging the sealing ring 5, and improves the welding quality.
[0076] Further, the first section 26 is connected with the riveting section 21, the second section 22 is connected to one end of the first section 26 away from the riveting section 21, the hole wall of the second hole channel 112 is matched with the outer peripheral wall of the first section 26, the outer peripheral wall of the second section 22 extends out of the outer peripheral wall of the first section 26 in the radial direction towards the direction away from the center of the through hole 11, and the pole step 23 is formed at the connection between the first section 26 and the second section 22, the pole step 23 has the second step face 24.
[0077] When the pole 2 is matched with the connecting piece 1, the first section 26 is matched with the second hole channel 112, the second section 22 is located above the opposite side of the turned edge 141, and the second step face 24 is arranged spaced apart from the surface of the turned edge 141, the second step face 24 can play a role of reflecting the leaked or scattered laser, further dissipates the laser energy, so as to prevent the laser from damaging the sealing ring 5; the second step face 24 and the shielding part 12 jointly block the leaked or scattered laser, the shielding part 12 and the pole step 23 achieve the effect of blocking the laser at double corners, and the sealing performance and the welding quality are ensured to be good.
[0078] In addition, in the forming process of the connecting piece 1, the conventional straight hole 11 in the prior art is a single cylindrical hole, and during extrusion forming, the straight hole limits the material to flow in a single direction, i.e., from the center of the through hole 11 to the outer edge of the connecting piece 1. The path is long and the direction is limited, the material flow is concentrated, and local stress accumulation is caused, which is prone to cracks or warping. In the present scheme, at least one step is arranged in the through hole 11 to form a segmented hole wall, the material flow direction is divided into two parts, part of the material continues to flow from the center to the outer edge, and the other part of the material can flow back to the center of the through hole 11 along the step to form an in-diameter flow, thereby facilitating material forming and reducing stress.
[0079] In the present embodiment, the riveting section 21, i.e., the deformed section, of the pole 2 is tightly fitted with the first hole 111 to reduce the radial gap to microns, greatly increasing the difficulty of laser penetration gap and isolating the laser penetration path; the second step surface 24 and the shielding part 12 jointly block the leaked laser or scattered laser, and the shielding part 12 and the pole step 23 achieve the effect of blocking the laser at double corners, multiple reflection and scattering of the leaked laser or scattered laser are provided, double protection effect is provided, direct irradiation of the laser on the sealing ring 5 is effectively avoided, and the risk of ablation is reduced; after the shielding part 12 is arranged in the through hole 11, the material flows in two directions during extrusion forming, the outward flow is the traditional path along the center of the through hole 11 to the outer edge, and the inward flow is the flow to the center of the through hole 11, so that the stress distribution is more uniform, and cracks or warping caused by local stress concentration are avoided.
[0080] In addition, the pole 2 further includes a fitting section 25 and an end 28, the fitting section 25 is connected to one end of the second segment 22 away from the first segment 26, and the end 28 is connected to one end of the fitting section 25 away from the second segment 22, and the first ring body 51 of the sealing ring 5 is clamped between the fitting section 25 and the surface of the flange 141.
[0081] As shown in Figs. Figure 6 , Figure 7 , Figure 10 The cover plate assembly further includes an upper insulating piece 6 and a lower insulating piece 3, the lower insulating piece 3 is a plate body, a first mounting hole is formed in the plate body, the protruding part 14 and the flange 141 of the connecting piece 1 are arranged in the first mounting hole, and the plate body of the lower insulating piece 3 is clamped between the piece body 13 of the connecting piece 1 and the cover plate 4 to play an insulating role, and the upper insulating piece 6 is a ring sleeve, which is sleeved on the end 28 of the pole and extends between the end 28 and the cover plate 4 to play an insulating role.
[0082] In some embodiments, the second step surface 24 is provided with a light-absorbing layer, which can be but is not limited to a ceramic composite material, and the light-absorbing layer is coated on the second step surface 24 to absorb the leaked laser or scattered laser.
[0083] Thirdly, the present invention also provides a battery, including a cover assembly as described in any of the above claims.
[0084] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.
Claims
1. A connecting piece, characterized in that, include: The main body has a through hole (11); The through hole (11) includes at least a first channel (111) and a second channel (112) that are connected along the axial direction; The wall of the second channel (112) protrudes radially toward the center of the through hole (11) relative to the wall of the first channel (111) to form a shielding portion (12).
2. The connecting piece according to claim 1, characterized in that, In the radial direction, the diameter of the first channel (111) is R1, the diameter of the second channel (112) is R2, the value of R1 is 5mm < R1 < 37mm, and the value of R2 is 5mm ≤ R2 ≤ 35mm.
3. The connecting piece according to claim 2, characterized in that, The diameter R1 of the first channel (111) and the diameter R2 of the second channel (112) satisfy 0.75 < R2 / R1 < 1. 。 4. The connecting piece according to claim 1, characterized in that, In the axial direction, the height of the first channel (111) is H1, the height of the second channel (112) is H2, the value of H1 is 1mm≤H1≤2mm, and the value of H2 is 0.5mm≤H2≤1.5mm.
5. The connecting piece according to claim 4, characterized in that, The height H1 of the first channel (111) and the height H2 of the second channel (112) satisfy 0.25≤H2 / H1≤1.
5.
6. The connecting piece according to any one of claims 1 to 5, characterized in that, The main body includes a sheet (13), a protrusion (14), and a flange (141). The protrusion (14) protrudes from one side surface of the sheet (13), and the flange (141) is connected to the side of the protrusion (14) away from the sheet (13). The through hole (11) penetrates the sheet (13), the protrusion (14), and the flange (141), forming a first channel (111) corresponding to the sheet (13) and the protrusion (14), and a second channel (112) corresponding to the flange (141); and / or, The wall of the second channel (112) is a straight surface or an arc surface protruding towards the center of the through hole; and / or, An internal step is formed at the connection between the first channel (111) and the second channel (112); the internal step has a first step surface (121), and a light-absorbing layer is provided at the first step surface (121).
7. A cover plate assembly, characterized in that, include: The cover plate (4) has an electrode post hole (41); The connecting piece according to any one of claims 1-6 is provided on one side of the cover plate (4), and the through hole (11) is connected to the pole hole (41); The pole post (2) is inserted through the pole post hole (41) and the through hole (11). The outer peripheral wall of the pole post (2) is adapted to the hole wall of the through hole (11). The second channel (112) is set close to the cover plate (4) relative to the first channel (111).
8. The cover plate assembly according to claim 7, characterized in that, The pole post (2) includes a main body section (27) and a riveting section (21) connected along the axial direction. The wall of the second channel (112) is configured to cooperate with the outer peripheral wall of the main body section (27). The riveting section (21) is disposed in the first channel (111), and the outer peripheral wall of the riveting section (21) is configured to cooperate with the wall of the first channel (111).
9. The cover plate assembly according to claim 8, characterized in that, The main body segment (27) includes at least a first segment (26) and a second segment (22) connected along the axial direction. The first segment (26) is connected to the riveting segment (21), and the second segment (22) is connected to the end of the first segment (26) away from the riveting segment (21). The wall of the second channel (112) is engaged with the outer peripheral wall of the first segment (26). The outer peripheral wall of the second segment (22) extends radially away from the center of the through hole (11) from the outer peripheral wall of the first segment (26), and a pole post step (23) is formed at the connection between the first segment (26) and the second segment (22). The pole post step (23) has a second step surface (24), and a light-absorbing layer is provided at the second step surface (24).
10. A battery, characterized in that, Includes the cover plate assembly as described in any one of claims 7-9 above.