Cover plate assembly and secondary battery

Abstract

The utility model discloses a cover plate assembly and a secondary battery, and relates to the technical field of secondary batteries. Comprising a battery cover plate, a pole and a connecting piece, the battery cover plate is provided with an inner side face and an outer side face which are oppositely arranged, the battery cover plate is provided with a first pole mounting hole penetrating through the inner side face and the outer side face, the pole penetrates through the first pole mounting hole, one end of the pole is connected with the outer side face, and the other end of the pole is exposed out of the first pole mounting hole; the battery cover plate is connected to the pole in a sleeving manner, the connecting piece is connected to the inner side surface of the battery cover plate, a second pole mounting hole is formed in the connecting piece, and one end, exposed out of the first pole mounting hole, of the pole penetrates into the second pole mounting hole of the connecting piece, so that the pole is in threaded connection, riveting or interference fit with the second pole mounting hole. The cover plate assembly provided by the utility model is simple in connection structure and has the advantages of safety and reliability, and the assembly efficiency of the cover plate assembly and the secondary battery with the cover plate assembly is also improved.

Description

Technical Field

[0001] The present application relates to the technical field of secondary batteries, and in particular to a cover plate assembly and a secondary battery. Background Art

[0002] The cover assembly in the secondary battery includes a battery cover, positive and negative poles and a connecting piece. The positive and negative poles are respectively mounted on the battery cover and form a sealed assembly with the battery cover. The connecting piece is used to connect the pole ear and the body of the winding core.

[0003] In the related art, the bottom of the pole has a welding base plate, and the connecting piece has a corresponding welding pad. Before welding the pole and the connecting piece, the welding base plate of the pole and the welding pad of the connecting piece need to be aligned and assembled, and then the welding base plate and the welding pad are welded together after the assembly is completed. Such a structure increases the assembly process of the cover assembly. Utility Model Content

[0004] In view of this, the present application provides a cover plate assembly and a secondary battery, aiming to provide a new assembly structure of a battery cover plate, a pole and a connecting piece to solve one of the technical problems in the prior art.

[0005] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0006] In a first aspect, an embodiment of the present application provides a cover plate assembly, including:

[0007] A battery cover plate, having an inner side surface and an outer side surface arranged opposite to each other, wherein the battery cover plate is provided with a first pole mounting hole penetrating through the inner side surface and the outer side surface;

[0008] A pole, which is inserted into the first pole mounting hole, one end of the pole is connected to the outer side surface, and the other end is exposed from the first pole mounting hole;

[0009] A connecting piece is connected to the inner side of the battery cover plate, and a second pole mounting hole is opened on the connecting piece. One end of the pole exposed from the first pole mounting hole is inserted into the second pole mounting hole of the connecting piece, so that the pole is threaded, riveted or interference fit with the second pole mounting hole.

[0010] In one embodiment of the first aspect, the connecting piece includes a welding portion, the second pole mounting hole is opened in the welding portion, and the welding portion and an end of the pole exposed from the first pole mounting hole are welded;

[0011] When the pole is threadedly connected to the second pole mounting hole, the pole and the welding portion are threadedly connected, and the threaded connection between the pole and the welding portion is welded.

[0012] In one embodiment of the first aspect, the connecting piece further includes two extending portions, the two extending portions are arranged at intervals and are respectively connected to the welding portions, and the extending portions and the welding portions are arranged integrally.

[0013] In one embodiment of the first aspect, the extension portion is in a bent shape, and the extension portion has an angle α, which satisfies: 0°<α≤180°; when α=180°, the extension portion is in a flat plate shape, and when 0°<α<180°, the extension portion is in a bent shape.

[0014] In one embodiment of the first aspect, the battery cover plate includes a conductive substrate and a lower insulating plate, the conductive substrate and the lower insulating plate are connected, the inner side surface is arranged on a side of the lower insulating plate away from the conductive substrate, and the outer side surface is arranged on a side of the conductive substrate away from the lower insulating plate;

[0015] A first slot is formed on the inner side surface of the lower insulating plate at a position corresponding to the first pole mounting hole. The first pole mounting hole is arranged at the bottom of the first slot. The welding portion of the connecting piece is clamped in the first slot.

[0016] In one embodiment of the first aspect, the pole includes an upper plastic part and a body, the body includes a knob section, a middle section and a connecting section arranged in sequence, the upper plastic part is ring-shaped, and the upper plastic part is sleeved on the knob section.

[0017] In one embodiment of the first aspect, the connecting section is exposed from the first pole mounting hole, and the connecting section is threadedly connected to the second pole mounting hole, wherein:

[0018] The inner wall of the second pole mounting hole is provided with threads, and the outer wall of the connecting section is correspondingly provided with screw threads. In the axial direction of the pole, the length of the connecting section is L1, and the length of the second pole mounting hole is L2, satisfying: L1 / L2≥0.9.

[0019] In one embodiment of the first aspect, a second slot is formed on the outer surface of the conductive substrate at a position corresponding to the first pole mounting hole, the first pole mounting hole is arranged at the bottom of the second slot, and the upper plastic part is snapped into the second slot.

[0020] In one embodiment of the first aspect, the inner periphery of the upper plastic part and the middle section are spaced apart, and the middle section and the hole wall of the first pole mounting hole are spaced apart, and a sealing groove is defined between the middle section, the upper plastic part and the battery cover plate;

[0021] The pole further comprises a sealing member, which is sleeved on the middle section and filled in the sealing groove. One end of the sealing member abuts against the knob section, and the other end abuts against the welding portion.

[0022] In one embodiment of the first aspect, the seal comprises:

[0023] A first sealing ring, wherein the first sealing ring is connected to the lower insulating plate, and a longitudinal section of the first sealing ring is in a straight line shape or a broken line shape;

[0024] A second sealing ring, wherein the second sealing ring is connected to the first sealing ring, the second sealing ring is connected to the upper plastic part, and a longitudinal section of the second sealing ring is in a straight line shape or a broken line shape.

[0025] In the second aspect, an embodiment of the present application also provides a secondary battery, comprising a cover plate assembly, an aluminum shell, a winding core tab and a winding core in any of the above embodiments, wherein the cover plate assembly is covered on the aluminum shell, and an accommodating cavity is formed between the cover plate assembly and the aluminum shell, the winding core tab and the winding core are arranged in the accommodating cavity, and the winding core tab is welded to the connecting piece.

[0026] Compared with the prior art, the beneficial effects of the present application are as follows: the present application proposes a cover plate assembly, including a battery cover plate, a pole and a connecting piece, wherein the battery cover plate has an inner side surface and an outer side surface arranged relatively to each other, the battery cover plate is provided with a first pole mounting hole penetrating the inner side surface and the outer side surface, the pole is inserted into the first pole mounting hole, one end of the pole is connected to the outer side surface, and the other end is exposed from the first pole mounting hole, so that the battery cover plate is sleeved on the pole, the connecting piece is connected to the inner side surface of the battery cover plate, the connecting piece is provided with a second pole mounting hole, one end of the pole exposed from the first pole mounting hole is inserted into the second pole mounting hole of the connecting piece, so that the pole and the second pole mounting hole are threaded, riveted or interference fit. With such a structure, compared with the prior art, the pole of the present application does not need to be provided with a welding base plate, and the welding base plate of the pole is combined and arranged on the connecting piece, which simplifies the structure of the pole, and also saves the process of aligning and assembling and welding the welding base plate and the welding pad in the related technology.

[0027] In addition, by threading, riveting or interference fitting the cover plate assembly through the pole and second pole mounting holes, the purpose of effective compression and preliminary sealing can be achieved. There is no need to press the connecting piece, and the pressure required for the welding process can be achieved to facilitate welding of the connecting piece, which facilitates welding of the battery cover plate, reduces the welding accuracy and clamping accuracy requirements of the equipment, reduces the risk of air leakage, and improves the yield rate of the cover plate; and, the cover plate assembly completed by threading, riveting or interference fitting can also ensure the airtightness of the cover plate assembly without welding, reduces the risk of air leakage, and improves the yield rate of the cover plate assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the structure of a secondary battery in some embodiments of the present application is shown;

[0030] Figure 2 A schematic diagram of the exploded structure of a secondary battery in some embodiments of the present application is shown;

[0031] Figure 3 A schematic diagram of the cross-sectional structure of a secondary battery in some embodiments of the present application is shown;

[0032] Figure 4 Shows Figure 3 A schematic diagram of the enlarged structure at position I in the middle;

[0033] Figure 5 One of the structural schematic diagrams of the connecting sheet in some embodiments of the present application is shown;

[0034] Figure 6 The second structural schematic diagram of the connecting piece in some embodiments of the present application is shown;

[0035] Figure 7 The third structural schematic diagram of the connecting piece in some embodiments of the present application is shown;

[0036] Figure 8 One of the structural schematic diagrams of the knob segment in some embodiments of the present application is shown;

[0037] Fig. 9 The second structural schematic diagram of the knob section in some embodiments of the present application is shown;

[0038] Fig.10 The third structural schematic diagram of the knob section in some embodiments of the present application is shown;

[0039] Fig.11 Shows Figure 4 One of the enlarged structural diagrams at II in the middle;

[0040] Fig.12 Shows Figure 4 The second schematic diagram of the enlarged structure at II in the middle;

[0041] Fig.13 Shows Figure 4 The third schematic diagram of the enlarged structure at II in the middle.

[0042] Description of main component symbols:

[0043] 1000-secondary battery;

[0044] 100-cover assembly; 110-battery cover; 1121-inner side; 11211-first card slot; 1111-outer side; 11111-second card slot; 111-conductive substrate; 112-lower insulating plate; 113-first pole mounting hole; 120-connecting piece; 1211-second pole mounting hole; 121-welding portion; 122-extension portion; 130-pole; 131-body; 1311-knob section; 13111-connecting groove; 1312-middle section; 1313-connecting section; 132-upper plastic part; 133-seal; 1331-first sealing ring; 1332-second sealing ring; 114-sealing groove;

[0045] 200-aluminum shell;

[0046] 300-winding core; 310-winding core tab. DETAILED DESCRIPTION

[0047] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0048] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0050] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0052] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present application provides a cap plate assembly 100 for welding a winding core tab 310 to assemble a secondary battery 1000 with a winding core 300 .

[0053] The cap plate assembly 100 includes a battery cap plate 110 , a pole 130 and a connecting piece 120 .

[0054] The battery cover 110 has an inner side surface 1121 and an outer side surface 1111 that are arranged opposite to each other. Specifically, the inner side surface 1121 is a side of the secondary battery 1000 that is close to the winding core 300 , and the outer side surface 1111 is a side that is away from the winding core 300 .

[0055] The battery cover 110 is provided with a first pole mounting hole 113 penetrating the inner side surface 1121 and the outer side surface 1111. The pole 130 is inserted into the first pole mounting hole 113, and one end of the pole 130 is connected to the outer side surface 1111, and the other end is exposed from the first pole mounting hole 113.

[0056] In this embodiment, the battery cover 110 includes a conductive substrate 111 and a lower insulating plate 112, the outer side surface 1111 is arranged on the side of the metal substrate away from the lower insulating plate 112, the inner side surface 1121 is arranged on the side of the lower insulating plate 112 away from the metal substrate, and the first pole mounting hole 113 passes through the conductive substrate 111 and the lower insulating plate 112.

[0057] In this embodiment, the number of the first pole mounting holes 113 is two, and a pole 130 is respectively disposed in each of the first pole mounting holes 113 . One of the two poles 130 is a positive pole, and the other is a negative pole.

[0058] The connecting piece 120 is connected to the inner side surface 1121 of the battery cover 110 . The connecting piece 120 is provided with a second pole mounting hole 1211 . One end of the pole 130 exposed from the first pole mounting hole 113 is passed through the second pole mounting hole 1211 of the connecting piece 120 .

[0059] Please refer to Figure 4 In this embodiment, the pole 130 is threaded, riveted or interference fit with the second pole mounting hole 1211. Compared with the prior art, the pole 130 of the present application does not need to be provided with a welding base plate, and the welding base plate of the pole 130 is combined and provided on the connecting piece 120, which simplifies the structure of the pole 130 and also saves the process of aligning and assembling the welding base plate and the welding pad in the related art.

[0060] In addition, by threading, riveting or interference fitting the pole 130 and the second pole mounting hole 1211 to clamp the cover plate assembly 100, the purpose of effective compression and preliminary sealing is achieved, and the pressure required for the welding process can be achieved without pressing the connecting piece 120, so that the connecting piece 120 can be welded, which facilitates the welding of the battery cover plate 110, reduces the welding accuracy and clamping accuracy requirements of the equipment, reduces the risk of leakage, and improves the yield of the cover plate; and, the cover plate assembly 100 that is threaded, riveted or interference fit can also ensure the airtightness of the cover plate assembly 100 without welding, reduces the risk of leakage, and improves the yield of the cover plate assembly 100.

[0061] In this embodiment, one end of the pole 130 exposed in the first pole mounting hole 113 is threadedly connected to the second pole mounting hole 1211. Such a connection structure is simple and compact, simplifies the processing procedures of the battery cover 110, the pole 130 and the connecting piece 120, and improves the assembly efficiency of the cover assembly 100.

[0062] Specifically, Figure 4 As shown, a screw thread is provided on one end of the pole 130 exposed from the first pole mounting hole 113, and the second pole mounting hole 1211 is a threaded hole. During assembly, the connecting piece 120 is first clamped in the first clamping groove 11211 to fix the relative position of the second pole mounting hole 1211 and the first pole mounting hole 113, and then the pole 130 is inserted into the first pole mounting hole 113 from the outer side 1111, and the thread is locked at the second pole mounting hole 1211, so that the pole 130, the battery cover 110 and the connecting piece 120 are assembled together to improve the assembly efficiency.

[0063] In other embodiments, the end of the pole 130 exposed in the first pole mounting hole 113 and the second pole mounting hole 1211 can also be fixedly connected by riveting, screw riveting, interference fit, etc., which are not limited to the examples. In this way, the structure of the cover assembly 100 is more stable. At the same time, the sealing of the connection between the pole 130, the battery cover 110 and the connecting piece 120 can be improved through the above connection method. In addition, the contact area between the welding part 121 and the pole 130 can be increased through the above connection method, the electric flux between the pole 130 and the welding part 121 can be increased, the internal resistance can be reduced, and the internal energy efficiency of the winding core 300 can be promoted.

[0064] In one embodiment, please refer to Figure 5 The connecting piece 120 includes a welding portion 121 and an extending portion 122 .

[0065] The second pole mounting hole 1211 is opened in the welding portion 121 , and the welding portion 121 and the pole 130 exposed at one end of the first pole mounting hole 113 are welded.

[0066] Specifically, when the pole 130 is threadedly connected to the second pole mounting hole 1211 , the pole 130 and the welding portion 121 are threadedly connected, and the threaded connection between the pole 130 and the welding portion 121 is welded.

[0067] The pole 130 and the connecting piece 120 are tightly connected, and then the pole 130 and the connecting piece 120 are welded at the edge of the second pole mounting hole 1211 from the inner side surface 1121 of the battery cover 110 to achieve a tight connection between the pole 130 and the connecting piece 120, which is equivalent to reinforcing the connection between the pole 130 and the connecting piece 120 by welding, adding a safety protection, and also improving the sealing between the pole 130 and the connecting piece 120.

[0068] In one embodiment, the connecting piece 120 includes two extensions 122, which are arranged at intervals and connected to the welding part 121 respectively, and the two extensions 122 are arranged at intervals and connected to the welding part 121 respectively, and the extensions 122 and the welding part 121 are both conductive parts. The extensions 122 and the welding part 121 are arranged in one piece, which improves the connection stability and compactness between the welding part 121 and the two extensions 122, thereby improving the structural stability of the connecting piece 120.

[0069] It should be noted that there is no particular restriction on the number of extensions 122, and the extensions 122 are used to weld the tabs of the winding core 300. When the connecting piece 120 only needs to weld the tab of one winding core 300, the number of extensions 122 can be set to one. Generally, one connecting piece 120 needs to be welded to two winding core tabs 310, and two spaced extensions 122 are provided to weld the two winding core tabs 310 respectively.

[0070] In one embodiment, the extension portion 122 is in a bent shape, and the extension portion 122 has an angle α that satisfies: 0°<α≤180°.

[0071] For example, Figure 5 As shown, when the angle α is 180°, the extension portion 122 is a flat plate structure and is not bent. Figure 6 and Figure 7 As shown, when the angle α is 90°, one side of the extension portion 122 is bent, which is convenient for connecting the winding core tabs 310 of various lengths, thereby improving the practicality of the cover plate assembly 100. Of course, the angle α can also be 30°, 45°, 60°, 75°, 105°, 120°, 135°, etc., which is not limited to the example angles, and can be adjusted as needed in actual applications.

[0072] In one embodiment, Figure 2 As shown, a first slot 11211 is provided on the inner side surface 1121 of the battery cover 110 corresponding to the position of the first pole mounting hole 113, the first pole mounting hole 113 is arranged at the bottom of the first slot 11211, and the welding portion 121 of the connecting piece 120 is connected to the first slot 11211. Through this assembly method, the connecting piece 120 is assembled on the battery cover 110.

[0073] In this embodiment, the welding portion 121 of the connecting piece 120 is in the shape of a flat plate, the shape of the first card slot 11211 matches the shape of the welding portion 121, and the welding portion 121 is pressed and assembled into the first card slot 11211 along its thickness direction. The welding portion 121 can be completely received in the first card slot 11211, so that the rear surface of the welding portion 121 after being loaded into the first card slot 11211 is flush with the inner side surface 1121. Of course, the welding portion 121 can also be partially received in the first card slot 11211, so that the rear surface of the connecting piece 120 after being loaded into the first card slot 11211 protrudes from the inner side surface 1121. Both of these methods can make the connecting piece 120 assembled on the battery cover plate 110, and make the battery cover plate 110 smaller in size and more compact in structure, thereby improving the space utilization rate inside the battery.

[0074] Of course, in other embodiments, the shape of the first slot 11211 can be changed so that the welding portion 121 and the extension portion 122 of the connecting piece 120 can be pressed into the first slot 11211 along the thickness direction. The welding portion 121 and the extension portion 122 can be completely received in the first slot 11211, so that the rear surface of the welding portion 121 and the extension portion 122 after being loaded into the first slot 11211 is flush with the inner side surface 1121. Of course, the welding portion 121 and the extension portion 122 can also be partially received in the first slot 11211, so that the rear surface of the welding portion 121 and the extension portion 122 after being loaded into the first slot 11211 protrudes from the inner side surface 1121. Both of these methods enable the connecting piece 120 to be assembled on the battery cover 110, and make the battery cover 110 smaller in size, more compact in structure, and improve the space utilization rate inside the battery.

[0075] When the connecting piece 120 is snapped into the first slot 11211 , the first pole mounting hole 113 and the second pole mounting hole 1211 are overlapping holes, and the first pole mounting hole 113 and the second pole mounting hole 1211 are coaxially arranged, which facilitates the rapid positioning and efficient assembly of the pole 130 .

[0076] The end face of the pole 130 away from the outer side surface 1111 is flush with the end of the welding portion 121 away from the inner side surface 1121, or the end face of the pole 130 away from the outer side surface 1111 is slightly higher than the end of the welding portion 121 away from the inner side surface 1121, so as to facilitate welding the pole 130 and the welding portion 121 together.

[0077] In this embodiment, the welding position of the pole 130 and the welding portion 121 is set at the second pole mounting hole 1211 on the side of the welding portion 121 away from the inner side surface 1121 , which is equivalent to welding along the edge of the second pole mounting hole 1211 .

[0078] like Figure 2 As shown, before assembling the cover assembly 100 of the secondary battery 1000 of the present application, the winding core tab 310 and the connecting piece 120 are first welded, and then the connecting piece 120 is assembled on the battery cover 110, and finally the pole 130 is installed into the battery cover 110 by flipping. In this way, during the assembly process, the welding point between the connecting piece 120 and the winding core tab 310 and the welding point between the pole 130 and the connecting piece 120 are exposed, and there is more space for welding the two welding points, thereby improving the production efficiency of the secondary battery 1000.

[0079] In addition, by welding, the welding portion 121 of the connecting piece 120 and the pole 130 form a fixed connection, making the structure of the cover assembly 100 more stable. At the same time, welding can also be used to improve the sealing of the connection between the pole 130, the battery cover 110 and the connecting piece 120. On the other hand, welding can also be used to increase the electric flux between the pole 130 and the welding portion 121, reduce the contact internal resistance between the pole 130 and the welding portion 121, and promote the internal energy efficiency of the winding core 300.

[0080] In one embodiment, the pole 130 includes an upper plastic part 132 and a body 131 . The body 131 includes a knob section 1311 , a middle section 1312 and a connecting section 1313 arranged in sequence. The upper plastic part 132 is ring-shaped and sleeved on the knob section 1311 .

[0081] In this embodiment, when the upper plastic part 132 is disposed on the positive pole, the upper plastic part 132 is a conductive part, and when the upper plastic part 132 is disposed on the negative pole, the upper plastic part 132 is an insulating part. Of course, in other embodiments, the upper plastic parts 132 of the positive and negative poles can also be insulating parts, which can be selected according to design requirements.

[0082] A buckle is disposed on the upper plastic component 132 to facilitate snapping the upper plastic component 132 to the outer side surface 1111 of the battery cover 110 .

[0083] Specifically, a second slot 11111 is formed on the outer side surface 1111 at a position corresponding to the first pole mounting hole 113 . The first pole mounting hole 113 is disposed at the bottom of the second slot 11111 . The upper plastic component 132 is snapped into the second slot 11111 .

[0084] Exemplarily, a plurality of protrusions are provided on the edge of the upper plastic part 132, and a receiving groove matching the protrusion is provided at the position of the second card slot 11111 corresponding to the protrusion. When the upper plastic part 132 is connected to the second card slot 11111, the protrusion is correspondingly inserted into the receiving groove, which plays a role in positioning assembly and preventing the upper plastic part 132 from rotating. Of course, the protrusion can also be provided in the second card slot 11111, and the receiving groove can be provided in the upper plastic part 132, which also plays a role in positioning assembly and preventing the upper plastic part 132 from rotating.

[0085] The upper plastic part 132 is coaxially arranged with the first pole mounting hole 113, and the upper plastic part 132 is engaged with the second slot 11111 and remains fixed. After the knob section 1311 of the pole 130 is installed in the upper plastic part 132, the knob section 1311 remains rotatable, so as to facilitate the connection section 1313 of the pole 130 to be screwed into the second pole mounting hole 1211 of the welding portion 121.

[0086] A connection groove 13111 is formed on the surface of the knob section 1311 away from the connection section 1313 . The connection groove 13111 cooperates with a knob-turning tool to screw the connection section 1313 into the second pole mounting hole 1211 of the welding portion 121 .

[0087] In one embodiment, the connection section 1313 is exposed from the first pole mounting hole 113 , and the connection section 1313 is threadedly connected to the second pole mounting hole 1211 .

[0088] The inner wall of the second pole mounting hole 1211 is provided with a thread, and the outer wall of the connecting section 1313 is provided with a corresponding thread. In the axial direction of the pole 130, the length of the connecting section 1313 is L1, and the length of the second pole mounting hole 1211 is L2, satisfying: L1 / L2≥0.9. This ensures that there is a certain bonding force between the connecting section 1313 and the welding sheet, and the bonding structure of the pole 130 and the connecting sheet 120 is stable, and the pole 130 is not easy to rotate and detach from the second pole mounting hole 1211.

[0089] like Figure 4 As shown, in this embodiment, L1 / L2=0.9, so that the end face of the connecting section 1313 and the end face of the welding portion 121 are basically flush, which prevents the surface of the connecting section 1313 from being damaged, can reduce the volume of the cover plate assembly 100, and can also facilitate the subsequent welding head to weld the connecting section 1313 and the welding sheet along the edge of the second pole mounting hole 1211.

[0090] Please refer to Figures 8 to 10 It should be noted that there is no special restriction on the shape of the connecting groove 13111. For example, the cross-section of the connecting groove 13111 is set to a cross shape, a hexagonal shape, a flat shape, etc., which is not limited to the types shown in the examples, so that a cross screwdriver, a hexagonal wrench, a hexagonal screwdriver or a flat-blade screwdriver, etc. can be used to screw the pole 130 with a variety of matching tools or tools, not limited to the examples.

[0091] In this embodiment, the upper plastic part 132 and the middle section 1312 are spaced apart to prevent the upper plastic part 132 from hindering the rotation of the middle section 1312. Further, the middle section 1312 and the hole wall of the first pole mounting hole 113 are spaced apart to prevent the hole wall of the first pole mounting hole 113 from hindering the rotation of the middle section 1312, and a sealing groove 114 is defined between the middle section 1312, the upper plastic part 132, the metal substrate and the lower insulating plate 112.

[0092] like Figure 4 As shown, the sealing groove 114 is substantially in the shape of “)(”, and the shape of the sealing member 133 is the same as the shape of the sealing groove 114, so that the sealing member 133 can completely fill the sealing groove 114.

[0093] In one embodiment, the pole 130 also includes a seal 133, which is sleeved on the middle section 1312. When the pole 130 passes through the first pole mounting hole 113, the seal 133 is simultaneously pressed into the sealing groove 114. During the screwing process of the body 131, the seal 133 is continuously squeezed and deformed. When the knob section 1311 is assembled in place, the seal 133 is fixedly filled in the sealing groove 114 to achieve a sealed assembly between the pole 130 and the battery cover 110.

[0094] In this embodiment, the seal 133 is an insulating seal 133, which insulates the pole 130 and the battery cover 110 to prevent short circuit.

[0095] In this embodiment, when the pole 130 and the connecting piece 120 are turned into place, one end of the sealing member 133 abuts against the knob section 1311, and the other end abuts against the welding portion 121, and the sealing member 133 is clamped and fixed in the sealing groove 114. In this way, a sealed connection is formed between the battery cover plate 110 and the pole 130, and a stable connection is formed between the body 131 and the battery cover plate 110.

[0096] In one embodiment, the sealing member 133 includes a first sealing ring 1331 and a second sealing ring 1332 .

[0097] Please refer to Figure 4 and Fig.11 The first sealing ring 1331 and the second sealing ring 1332 can be provided as one piece or separately. In terms of assembly efficiency, the assembly efficiency of the separately provided sealing member 133 is higher than that of the integrally provided sealing member 133. Splitting the sealing member 133 into the first sealing ring 1331 and the second sealing ring 1332 facilitates assembly and helps improve assembly efficiency.

[0098] Specifically, the first sealing ring 1331 is connected to the lower insulating plate 112, and the longitudinal section of the first sealing ring 1331 is linear or folded line; the second sealing ring 1332 is connected to the first sealing ring 1331, and the second sealing ring 1332 is connected to the upper plastic part 132, and the longitudinal section of the second sealing ring 1332 is linear or folded line.

[0099] For example, see Fig.11 , the first sealing ring 1331 and the second sealing ring 1332 are both in a broken line shape.

[0100] One end of the first sealing ring 1331 is connected to the edge of the lower insulating plate 112 , and the other end is connected to the second sealing ring 1332 . One end of the second sealing ring 1332 is connected to the inner periphery of the upper plastic part 132 , and the other end is connected to the first sealing ring 1331 .

[0101] For example, see Fig.12 The first sealing ring 1331 is in a straight line shape, and the second sealing ring 1332 is in a broken line shape.

[0102] One end of the first sealing ring 1331 is connected to the edge of the lower insulating plate 112, and the other end is connected to the second sealing ring 1332. One end of the second sealing ring 1332 is connected to the inner periphery of the upper plastic part 132, and the other end is connected to the first sealing ring 1331. It should be noted that, in some embodiments, the first sealing ring 1331 and the lower insulating plate 112 are integrally arranged to simplify the sealing ring structure and increase the convenience of assembling the sealing ring.

[0103] For example, see Fig.13 The first sealing ring 1331 is in a broken line shape, and the second sealing ring 1332 is in a straight line shape.

[0104] One end of the first sealing ring 1331 is connected to the edge of the lower insulating plate 112, and the other end is connected to the second sealing ring 1332. One end of the second sealing ring 1332 is connected to the inner periphery of the upper plastic part 132, and the other end is connected to the first sealing ring 1331. It should be noted that in some embodiments, the second sealing ring 1332 and the upper plastic part 132 are integrally arranged to simplify the sealing ring structure and increase the convenience of assembling the sealing ring.

[0105] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the present application also provides a secondary battery 1000, including the cover plate assembly 100, the aluminum shell 200, the core tab 310 and the core 300 in any of the above embodiments, the cover plate assembly 100 is covered on the aluminum shell 200, and an accommodating cavity is formed between the cover plate assembly 100 and the aluminum shell 200, the core tab 310 and the core 300 are arranged in the accommodating cavity, and the core tab 310 is welded to the connecting piece 120.

[0106] In this embodiment, the connecting piece 120 is welded to the winding core tab 310 , and the angle between the winding core tab 310 and the connecting piece 120 is not particularly limited.

[0107] The assembly process of the winding core 300 and the cover plate assembly 100 is as follows:

[0108] Welding the extension portion 122 of the connecting piece 120 and the winding core tab 310;

[0109] After welding is completed, the welding portion 121 of the connecting piece 120 is clamped into the first clamping groove 11211, and the connecting piece 120 and the battery cover plate 110 are clamped and fixed by a clamp or other means;

[0110] Insert the sealing member 133 into the body 131 of the pole 130, and make the sealing member 133 abut against the knob section 1311 of the body 131;

[0111] The upper plastic part 132 of the pole 130 is clamped in the second clamping groove 11111 and fixed;

[0112] Insert the body 131 of the pole 130 into the mounting hole of the first pole 130, and use a screwdriver or other tooling to continuously screw the body 131 of the pole 130 inwards, so that the seal 133 is continuously squeezed and deformed during the screwing process and filled into the sealing groove 114;

[0113] When screwed into place, the seal 133 is completely filled into the sealing groove 114 and fixed, and the screwing section of the body 131 abuts against the upper plastic part 132 and cannot be screwed further. In this way, the body 131 of the pole 130, the upper plastic part 132, the battery cover 110 and the welding part 121 of the connecting piece 120 are fixedly connected together;

[0114] On the side of the connecting piece 120 away from the battery cover plate 110 , welding is performed along the edge of the second pole mounting hole 1211 to weld the pole 130 and the connecting piece 120 together.

[0115] The connecting piece 120 of the secondary battery 1000 of the present application has an integrally arranged welding portion 121 and an extending portion 122 , which improves the structural integrity of the connecting piece 120 , reduces the internal resistance of the connecting piece 120 itself, and increases the electric flux between the body 131 and the tab.

[0116] At the same time, the connecting piece 120 of the secondary battery 1000 of the present application is directly involved in the assembly of the cover assembly 100. The connecting piece 120 is fixed to the battery cover 110 by snap-fitting, making the cover structure more compact, improving the assembly efficiency of the cover assembly 100, and at the same time, reducing the number of welding times of the cover assembly 100.

[0117] In addition, the connection piece 120 and the pole 130 are fixed by first threading and then welding, so that the structure of the cover assembly 100 is more stable, and the sealing of the cover assembly 100 is improved, thereby improving the sealing of the secondary battery 1000 and extending the service life of the secondary battery 1000. The connection piece 120 and the pole 130 are first threaded and then welded, and this connection method also reduces the contact internal resistance between the pole 130 and the connection piece 120, which is beneficial to the energy efficiency of the secondary battery 1000.

[0118] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0119] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A cover plate assembly, characterized in that: include: A battery cover plate, having an inner side surface and an outer side surface arranged opposite to each other, wherein the battery cover plate is provided with a first pole mounting hole penetrating through the inner side surface and the outer side surface; A pole, which is inserted into the first pole mounting hole, one end of the pole is connected to the outer side surface, and the other end is exposed from the first pole mounting hole; A connecting piece is connected to the inner side of the battery cover plate, and a second pole mounting hole is opened on the connecting piece. One end of the pole exposed from the first pole mounting hole is inserted into the second pole mounting hole of the connecting piece, so that the pole is threaded, riveted or interference fit with the second pole mounting hole.

2. The cover plate assembly according to claim 1, characterized in that: The connecting piece comprises a welding portion, the second pole mounting hole is formed in the welding portion, and the welding portion and an end of the pole exposed from the first pole mounting hole are welded; When the pole is threadedly connected to the second pole mounting hole, the pole and the welding portion are threadedly connected, and the threaded connection between the pole and the welding portion is welded.

3. The cover plate assembly according to claim 2, characterized in that: The connecting piece further includes two extending portions, the two extending portions are arranged at intervals and are respectively connected to the welding portions, and the extending portions and the welding portions are arranged integrally.

4. The cover plate assembly according to claim 3, characterized in that: The extension portion is in a bent shape and has an angle α, which satisfies: 0°<α≤180°; when α=180°, the extension portion is in a flat plate shape, and when 0°<α<180°, the extension portion is in a bent shape.

5. The cover plate assembly according to claim 3, characterized in that: The battery cover plate comprises a conductive substrate and a lower insulating plate, the conductive substrate and the lower insulating plate are connected, the inner side surface is arranged on a side of the lower insulating plate away from the conductive substrate, and the outer side surface is arranged on a side of the conductive substrate away from the lower insulating plate; A first slot is formed on the inner side surface of the lower insulating plate at a position corresponding to the first pole mounting hole. The first pole mounting hole is arranged at the bottom of the first slot. The welding portion of the connecting piece is clamped in the first slot.

6. The cover plate assembly according to claim 5, characterized in that: The pole comprises an upper plastic part and a body, the body comprises a knob section, a middle section and a connecting section which are arranged in sequence, the upper plastic part is ring-shaped, and the upper plastic part is sleeved on the knob section.

7. The cover plate assembly according to claim 6, characterized in that: The connecting section is exposed from the first pole mounting hole, and the connecting section is threadedly connected to the second pole mounting hole, wherein: The inner wall of the second pole mounting hole is provided with threads, and the outer wall of the connecting section is correspondingly provided with screw threads. In the axial direction of the pole, the length of the connecting section is L1, and the length of the second pole mounting hole is L2, satisfying: L1 / L2≥0.

9.

8. The cover plate assembly according to claim 6, characterized in that: A second slot is formed on the outer surface of the conductive substrate at a position corresponding to the first pole mounting hole. The first pole mounting hole is arranged at the bottom of the second slot. The upper plastic part is snapped into the second slot.

9. The cover plate assembly according to claim 6, characterized in that: The inner periphery of the upper plastic part and the middle section are spaced apart, and the middle section and the hole wall of the first pole mounting hole are spaced apart, and a sealing groove is defined between the middle section, the upper plastic part and the battery cover plate; The pole further comprises a sealing member, which is sleeved on the middle section and filled in the sealing groove. One end of the sealing member abuts against the knob section, and the other end abuts against the welding portion.

10. The cover plate assembly according to claim 9, characterized in that: The sealing member comprises: A first sealing ring, wherein the first sealing ring is connected to the lower insulating plate, and a longitudinal section of the first sealing ring is in a straight line shape or a broken line shape; A second sealing ring, wherein the second sealing ring is connected to the first sealing ring, the second sealing ring is connected to the upper plastic part, and a longitudinal section of the second sealing ring is in a straight line shape or a broken line shape.

11. A secondary battery, characterized in that: It comprises the cover plate assembly, aluminum shell, winding core pole ear and winding core according to any one of claims 1 to 10, the cover plate assembly is covered on the aluminum shell, a receiving cavity is formed between the cover plate assembly and the aluminum shell, the winding core pole ear and the winding core are arranged in the receiving cavity, and the winding core pole ear is welded to the connecting piece.

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