Secondary battery and cover structure thereof

Abstract

The present application provides a secondary battery and its cover plate structure. The above-mentioned secondary battery cover plate structure includes a substrate and a conductive connection assembly; the substrate is used to connect with the shell of the secondary battery to cover the end cover of the shell, and the substrate is provided with a conductive connection hole connected to the interior of the shell; the conductive connection assembly includes a conductive electrode column, a conductive connection cover and a conductive connection piece, the conductive connection cover is inserted into the conductive connection hole, a portion of the conductive connection cover is located in the shell, the conductive electrode column is connected to the conductive connection cover, the conductive connection piece is located in the shell, the conductive connection piece is connected to the side of the conductive connection cover facing away from the conductive electrode column, and the conductive connection piece is used to connect to the electrode group of the secondary battery. Part of the conductive connection cover is protruding, which facilitates the direct contact between the conductive connection piece and the conductive connection cover, and the conductive connection piece is connected to the electrode group, so that the electrical connection between the conductive connection piece and the electrode group does not need to be bent, which effectively reduces the difficulty of bending the connection piece.

Description

Technical Field

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

[0002] Lithium-ion batteries have the advantages of high specific energy, many cycles, and long storage time. They are not only widely used in portable electronic devices such as mobile phones, digital cameras, and laptops, but also widely used in large and medium-sized electric equipment such as electric vehicles, electric bicycles, and power tools. Therefore, the performance requirements for lithium-ion batteries are getting higher and higher. At present, the manufacturing process of battery cells can generally be divided into two types: full-tab and cut-tab. The assembly of cut-tab is divided into two types: bent connecting piece and bent tab. For battery cells with bent tabs, the welding of the electrode group and the connecting piece is called butterfly welding. Since butterfly welding is suitable for wider battery cells, among these assembly types, butterfly welding has the highest battery cell energy ratio. The current butterfly welding process is: first ultrasonically weld the connecting piece to the tab of the electrode group, and then laser weld the connecting piece to the cover plate, for example, patent CN216488280U.

[0003] However, traditional multi-layer stacked battery cells use a bent connecting piece method, which has a complicated assembly process, occupies a large space in the height direction, is difficult to bend the connecting piece, and is difficult to control the bending height. As a result, the connecting piece of the battery cell is easily damaged when bent, which easily leads to a decrease in the probability of the battery cell being a finished product, and further leads to excessively high battery production costs. Summary of the Invention

[0004] The object of the present invention is to overcome the deficiencies in the prior art and provide a secondary battery and a cover plate structure thereof that effectively reduce the difficulty of bending a connecting piece.

[0005] The object of the present invention is achieved through the following technical solutions:

[0006] A secondary battery cover plate structure comprises: a substrate and a conductive connection assembly; the substrate is used to connect to the shell of the secondary battery to cover the end cover opening of the shell, and the substrate is provided with a conductive connection hole connected to the interior of the shell; the conductive connection assembly comprises a conductive electrode column, a conductive connection cover and a conductive connection piece, the conductive connection cover is inserted into the conductive connection hole, a portion of the conductive connection cover is located in the shell, the conductive electrode column is connected to the conductive connection cover, the conductive connection piece is located in the shell, the conductive connection piece is connected to a side of the conductive connection cover facing away from the conductive electrode column, and the conductive connection piece is used to connect to the electrode group of the secondary battery.

[0007] In one embodiment, the conductive connection cover defines a first groove, an opening of the first groove faces away from the conductive connection sheet, and at least a portion of the conductive electrode column is disposed in the first groove.

[0008] In one embodiment, the conductive connection cover is provided with a second groove communicating with the first groove, and the second groove is used for penetration welding of the conductive connection sheet and the conductive connection cover.

[0009] In one embodiment, the diameter of the second groove is smaller than the diameter of the first groove.

[0010] In one embodiment, the conductive connection assembly further includes a fixing ring, which is located in the housing and sleeved on the conductive connection cover.

[0011] In one embodiment, the fixing ring has a fixing through hole, and the conductive connection cover is inserted into the fixing through hole and abuts against the conductive connection sheet.

[0012] In one embodiment, the conductive connection assembly further includes a sealing ring, which is located on a side of the substrate facing away from the conductive electrode column, and at least a portion of the sealing ring is located within the conductive connection hole, and the sealing ring is respectively in contact with the inner wall of the conductive connection hole and the outer wall of the conductive connection cover.

[0013] In one embodiment, the conductive connection assembly further includes an insulating ring, which is located on the side of the substrate facing away from the sealing ring, and at least a portion of the insulating ring is located in the conductive connection hole, and the insulating ring is respectively abutted against the inner wall of the conductive connection hole and the outer wall of the conductive connection cover.

[0014] In one embodiment, the insulating ring and the sealing ring abut against each other, and a receiving groove is formed between the insulating ring and the sealing ring, the opening of the receiving groove is away from the conductive connection cover, and the receiving groove accommodates a portion of the substrate.

[0015] A secondary battery comprises a battery shell, an electrode group, and the secondary battery cover structure described in any of the above embodiments, wherein the electrode group is arranged in the battery shell, the secondary battery cover structure covers the installation opening of the battery shell, and the conductive connecting piece of the secondary battery cover structure is connected to the electrode group.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] Part of the conductive connection cover protrudes and is arranged toward the conductive connection piece, which facilitates the direct contact between the conductive connection piece and the conductive connection cover, and the conductive connection piece is connected to the electrode group, so that the conductive electrode column is electrically connected to the conductive connection piece through the protruding arrangement of the conductive connection cover, thereby making the electrical connection between the conductive connection piece and the electrode group unnecessary to be bent, facilitating the electrical contact between the conductive connection piece and the electrode group and effectively reducing the difficulty of bending the connection piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 Schematic diagram of a secondary battery cover structure in one embodiment;

[0020] Figure 2 for Figure 1 A cross-sectional view of the secondary battery cover structure along the AA direction;

[0021] Figure 3 for Figure 2 The cross-sectional view shown is an enlarged schematic diagram at point A1;

[0022] Figure 4 is a schematic diagram of a secondary battery cover structure in another embodiment;

[0023] Figure 5 is a schematic diagram of a plate adjustment assembly in one embodiment;

[0024] Figure 6 is a schematic diagram of a secondary battery in one embodiment;

[0025] Figure 7 for Figure 6 The secondary battery is shown in a cross-sectional view along the BB direction. DETAILED DESCRIPTION

[0026] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] The present invention relates to a secondary battery cover plate structure. In one embodiment, the secondary battery cover plate structure includes a substrate and a conductive connection assembly. The substrate is configured to connect to the housing of the secondary battery to cover the end cap opening of the housing. The substrate defines a conductive connection hole that communicates with the interior of the housing. The conductive connection assembly includes a conductive electrode post, a conductive connection cover, and a conductive connection piece. The conductive connection cover is inserted into the conductive connection hole, partially located within the housing, and the conductive electrode post is connected to the conductive connection cover. The conductive connection piece is located within the housing and connected to a surface of the conductive connection cover facing away from the conductive electrode post. The conductive connection piece is configured to connect to the electrode group of the secondary battery. The conductive connection cover has a protruding portion that faces the conductive connection piece, facilitating direct contact between the conductive connection piece and the conductive connection cover. The conductive connection piece is in turn connected to the electrode group. The conductive connection piece, through the protruding configuration of the conductive connection cover, electrically connects the conductive electrode post to the conductive connection piece. This eliminates the need for bending the conductive connection piece to the electrode group, facilitating electrical contact between the conductive connection piece and the electrode group and effectively reducing the difficulty of bending the connection piece.

[0030] See also Figure 1 , which is a structural diagram of a secondary battery cover structure according to an embodiment of the present invention.

[0031] The secondary battery cover structure 10 of one embodiment includes a substrate 100 and a conductive connection assembly 200. The substrate 100 is used to connect to the housing of the secondary battery to cover the end cover of the housing. The substrate 100 is provided with a conductive connection hole 102 that communicates with the interior of the housing. Figure 2 and Figure 3The conductive connection assembly 200 includes a conductive electrode column 210, a conductive connection cover 220, and a conductive connection piece 230. The conductive connection cover 220 is inserted into the conductive connection hole 102, and a portion of the conductive connection cover 220 is located within the housing. The conductive electrode column 210 is connected to the conductive connection cover 220. The conductive connection piece 230 is located within the housing and is connected to a side of the conductive connection cover 220 facing away from the conductive electrode column 210. The conductive connection piece 230 is used to connect to the electrode group of the secondary battery.

[0032] In this embodiment, part of the conductive connection cover 220 protrudes and is arranged toward the conductive connection piece 230, so that the conductive connection piece 230 can directly contact the conductive connection cover 220, and the conductive connection piece 230 is connected to the electrode group, so that the conductive electrode column 210 is electrically connected to the conductive connection piece 230 through the protruding arrangement of the conductive connection cover 220, so that the electrical connection between the conductive connection piece 230 and the electrode group does not need to be bent, which facilitates the electrical contact between the conductive connection piece 230 and the electrode group and effectively reduces the difficulty of bending the connection piece.

[0033] In another embodiment, the conductive connecting piece 230 is welded to the electrode group by butterfly welding. Figure 4 The conductive connecting piece 230 has a butterfly welding area 232, and the butterfly welding area 232 corresponds to the output end of the electrode group to achieve welding of the electrode group on the butterfly welding area.

[0034] In one embodiment, see Figure 3 The conductive connection cover 220 defines a first groove 202. The opening of the first groove 202 faces away from the conductive connection sheet 230, and at least a portion of the conductive electrode column 210 is retained within the first groove 202. In this embodiment, the first groove 202 is defined on the conductive connection cover 220 and is used to receive a portion of the conductive electrode column 210. This allows the conductive electrode column 210 to be retained within the first groove 202, thereby engaging the conductive electrode column 210 with the conductive connection cover 220 and allowing the conductive electrode column 210 to be sheathed within the conductive connection cover 220. The first groove 202, serving as a receiving groove for the conductive electrode column 210, facilitates retaining the conductive electrode column 210 within the conductive connection cover 220, thereby facilitating connection between the conductive electrode column 210 and the conductive connection cover 220 and improving the strength of the connection between the conductive electrode column 210 and the conductive connection cover 220. The conductive electrode column 210 is located outside the shell, which facilitates the connection between the conductive electrode column 210 and an external conductive wire, thereby facilitating the output of electrical energy.

[0035] Further, see Figure 3 The conductive connection cover 220 defines a second groove 204 that communicates with the first groove 202. The second groove 204 is used for through-welding of the conductive connection piece 230 and the conductive connection cover 220. In this embodiment, the second groove 204 is defined at the bottom of the first groove 202 and communicates with the first groove 202, creating a continuous recessed space on the side of the conductive connection cover 220 facing away from the electrode assembly, thereby accommodating a larger portion of the conductive electrode column 210. Furthermore, the second groove 204 is located at the bottom of the first groove 202. During laser through-welding of the conductive connection piece 230 and the conductive connection cover 220, welding slag is confined within the second groove 204, preventing it from falling into the housing and effectively protecting the electrode assembly. In another embodiment, the diameter of the second groove 204 is smaller than that of the first groove 202. The smaller diameter of the second groove 204 forms a step structure in the conductive connection cover 220, that is, the bottom of the first groove 202 and the bottom of the second groove 204 form a step. When the second groove 204 collects welding slag, the conductive electrode column 210 is supported by the above-mentioned step and away from the welding slag in the second groove 204, so as to ensure the conductive performance between the conductive electrode column 210 and the conductive connection cover 220.

[0036] In one embodiment, see Figure 3The conductive connection assembly 200 further includes a fixing ring 240, which is located inside the housing and sleeved on the conductive connection cover 220. In this embodiment, the fixing ring 240 is located between the substrate 100 and the conductive connection sheet 230, that is, the fixing ring 240 is located inside the housing, and the fixing ring 240 is connected to the substrate 100 and the conductive connection sheet 230 respectively. Moreover, the fixing ring 240 is sleeved on the conductive connection cover 220, that is, the conductive connection cover 220 passes through the conductive connection hole 102 and the protruding portion is sleeved on the fixing ring 240, so that the fixing ring 240 fixes the conductive connection cover 220 at a position corresponding to the conductive connection hole 102, thereby fixing the position of the conductive connection cover 220 on the substrate 100, effectively improving the installation stability of the conductive connection cover 220 in the conductive connection hole 102. In another embodiment, the fixing ring 240 has a fixing through-hole, and the conductive connection cover 220 is disposed in the fixing through-hole and abuts against the conductive connection sheet 230. The fixing through-hole corresponds to the conductive connection hole 102, and the conductive connection cover 220 passes through the conductive connection hole 102 and the fixing through-hole in sequence, that is, the conductive connection cover 220 first passes through the conductive connection hole 102, then passes through the fixing through-hole, and finally connects with the conductive connection sheet 230. This allows a portion of the conductive connection cover 220 to be located in the fixing through-hole, facilitating the sleeve connection between the conductive connection cover 220 and the fixing ring 240, thereby improving the connection stability between the fixing ring 240 and the conductive connection cover 220.

[0037] In one embodiment, see Figure 3 The conductive connection assembly 200 further includes a sealing ring 250. The sealing ring 250 is located on a side of the substrate 100 facing away from the conductive electrode column 210. At least a portion of the sealing ring 250 is located within the conductive connection hole 102. The sealing ring 250 abuts against the inner wall of the conductive connection hole 102 and the outer wall of the conductive connection cover 220. In this embodiment, a portion of the sealing ring 250 is located between the conductive connection cover 220 and the substrate 100. Specifically, a portion of the sealing ring 250 is located between the conductive connection cover 220 and the inner wall of the conductive connection hole 102, thereby reducing the gap between the conductive connection cover 220 and the substrate 100. As a result, the sealing ring 250 blocks the gap between the conductive connection cover 220 and the inner wall of the conductive connection hole 102, reducing the probability of contact between the housing and the external environment, and effectively improving the sealing performance of the secondary battery.

[0038] Further, see Figure 3The conductive connection assembly 200 further includes an insulating ring 260. The insulating ring 260 is located on a side of the substrate 100 facing away from the sealing ring 250. At least a portion of the insulating ring 260 is located within the conductive connection hole 102, and the insulating ring 260 abuts against the inner wall of the conductive connection hole 102 and the outer wall of the conductive connection cover 220. In this embodiment, a portion of the insulating ring 260 is located between the conductive connection cover 220 and the substrate 100. Specifically, a portion of the insulating ring 260 is located between the conductive connection cover 220 and the inner wall of the conductive connection hole 102, so that the insulating ring 260 separates the conductive connection cover 220 from the substrate 100, thereby isolating the conductive connection cover 220 from the substrate 100 and preventing electrical leakage from the conductive connection cover 220 to the substrate 100. Furthermore, the insulating ring 260 can further reduce the gap between the conductive connection cover 220 and the substrate 100, thereby further improving the sealing performance of the secondary battery.

[0039] For further information, see Figure 3 The insulating ring 260 and the sealing ring 250 abut against each other, and a receiving groove 206 is formed between the insulating ring 260 and the sealing ring 250. The opening of the receiving groove 206 faces away from the conductive connection cover 220, and the receiving groove 206 accommodates a portion of the substrate 100. In this embodiment, the insulating ring 260 and the sealing ring 250 are respectively connected to the conductive connection cover 220 and the substrate 100, that is, the insulating ring 260 and the sealing ring 250 are partially located between the conductive connection cover 220 and the inner wall of the conductive connection hole 102. The insulating ring 260 and the sealing ring 250 seal and insulate between the conductive connection cover 220 and the substrate 100. The accommodating groove 206 is located at the abutment point of the insulating ring 260 and the sealing ring 250. The accommodating groove 206 accommodates part of the substrate 100, so that the substrate 100, the insulating ring 260 and the sealing ring 250 are clamped to improve the stability of the insulating ring 260 and the sealing ring 250 in the conductive connection hole 102, thereby improving the sealing and insulation of the conductive connection cover 220 and the substrate 100.

[0040] During the actual assembly process of the secondary battery, the conductive connecting piece 230 of the secondary battery cover structure contacts the pole ear on the pole group. However, the conductive connecting piece 230 is usually a copper plate with high rigidity, and the pole ear is a thin current collector. It is easy for the conductive connecting piece 230 to be directly pressed on the pole ear during the assembly process, causing the pole ear to contact the surface of the battery cell of the pole group, which can easily lead to the accumulation of heat generated by the pole ear after power is turned on, and then easily lead to excessive local temperature on the pole group, causing damage to the battery.

[0041] In order to facilitate the electrical connection between the conductive connecting piece 230 and the electrode group, please refer to Figure 3 and Figure 5 The secondary battery cover structure 10 also includes a plate adjustment component 300, which includes an adjustment member 310 and an alignment plate 320 that are connected to each other. The adjustment member 310 is located on a side of the alignment plate 320 close to the pole group, and the adjustment member 310 is connected to the pole group. The adjustment member 310 is provided with an adjustment groove 302, and the adjustment groove 302 is used to accommodate an adjustment protrusion to adjust the distance between the alignment plate 320 and the pole group; the alignment plate 320 is located on a side of the substrate 100 close to the pole group, and the alignment plate 320 is in contact with the substrate 100. The alignment plate 320 is provided with an alignment through hole 304 that is connected to the conductive connection hole 102, and the conductive connection cover 220 is passed through the alignment through hole 304.

[0042] In this embodiment, the positioning member 310 is located between the alignment plate 320 and the electrode group. The positioning member 310 lifts the alignment plate 320, causing the alignment plate 320 to move away from the electrode group, thereby causing the substrate 100 to move away from the electrode group, thereby forming a height difference between the conductive connecting piece 230 and the electrode group, which can effectively reduce the probability of the conductive connecting piece 230 over-pressing the electrode tab on the electrode group. The positioning groove 302 is opened on the positioning member 310, and the positioning groove 302 accommodates the positioning protrusion. The positioning protrusion further lifts the alignment plate 320. Specifically, by adjusting the mass of the positioning protrusion, the space occupied by the positioning protrusion in the positioning groove 302 can be adjusted, so that the positioning protrusion can adjust the distance between the substrate 100 and the electrode group by lifting the alignment plate 320. The alignment plate 320 is used to support the substrate 100 and to lift the substrate 100. During assembly, the conductive connection cover 220 passes through the conductive connection hole 102 and the alignment through-hole 304 in sequence, so that the conductive connection cover 220 is partially located within the housing, thereby positioning the conductive connection sheet 230 within the housing and in contact with the electrode assembly tab. The alignment through-hole 304 is aligned with the conductive connection hole 102, facilitating direct alignment of the conductive connection sheet 230 with the electrode assembly tab during assembly of the conductive connection assembly 200, thereby improving the assembly efficiency of the secondary battery.

[0043] Further, see Figure 5 The positioning member 310 is further provided with a positioning glue extrusion hole 306 connected to the positioning accommodating groove 302, and the positioning protrusion is penetrated by the positioning protrusion 306 so that the positioning protrusion is connected to the alignment plate 320 and the pole group respectively.

[0044] In this embodiment, the positioning bumps are a fluid colloid, for example, plastic glue, i.e., PP glue. After the positioning bumps are squeezed into the positioning grooves 302, they first fill the positioning grooves 302 and then contact the electrode assembly through the positioning glue extrusion holes 306, so that the positioning bumps adhere to the electrode assembly, facilitating the fixing of the positioning member 310 to the electrode assembly. Furthermore, as the number of positioning bumps increases, the gap between the alignment plate 320 and the positioning member 310 is filled with the positioning bumps. While improving the connection strength between the alignment plate 320 and the positioning member 310, the spacing between the alignment plate 320 and the positioning member 310 can also be increased, facilitating adjustment of the gap between the substrate 100 and the electrode assembly, thereby facilitating adjustment of the height of the substrate 100 relative to the electrode assembly and further reducing the probability of the conductive connecting piece 230 over-pressing the electrode tab of the electrode assembly.

[0045] For further information, please also refer to Figure 1 and Figure 5 The alignment plate 320 is provided with a first alignment hole 308, and the substrate 100 is provided with a second alignment hole 104. The first alignment hole 308 is connected to the second alignment hole 104, and both the first alignment hole 308 and the second alignment hole 104 are connected to the interior of the shell.

[0046] In this embodiment, the first alignment hole 308 is located on the alignment plate 320, serving as an alignment point on the alignment plate 320. The second alignment hole 104 is located on the substrate 100, serving as an alignment point on the substrate 100. When the substrate 100 and the alignment plate 320 are assembled, the first alignment hole 308 is aligned with the second alignment hole 104, i.e., the first alignment hole 308 and the second alignment hole 104 are aligned and connected, so that the alignment plate 320 and the substrate 100 are aligned, facilitating the alignment of the adjustment and glue extrusion holes 306 on the alignment plate 320 with the conductive connection holes 102 on the substrate 100. This facilitates the sequential insertion of the conductive connection assembly 200 through the conductive connection holes 102 and the adjustment and glue extrusion holes 306, further improving the assembly efficiency of the secondary battery.

[0047] In one embodiment, the present application also provides a secondary battery, please refer to Figure 6 and Figure 7The secondary battery 20 includes a battery shell 400, an electrode group 500, and the secondary battery cover structure 10 described in any of the above embodiments. The electrode group 500 is disposed in the battery shell 400. The secondary battery cover structure 10 covers the installation opening of the battery shell 400. The conductive connecting piece of the secondary battery cover structure 10 is connected to the electrode group 500. In this embodiment, the secondary battery cover structure includes a substrate and a conductive connecting assembly. The substrate is used to connect to the shell of the secondary battery to cover the end cover opening of the shell. The substrate is provided with a conductive connecting hole that communicates with the interior of the shell. The conductive connecting assembly includes a conductive electrode column, a conductive connecting cover, and a conductive connecting piece. The conductive connecting cover is inserted into the conductive connecting hole, a portion of the conductive connecting cover is located in the shell, and the conductive electrode column is connected to the conductive connecting cover. The conductive connecting piece is located in the shell and is connected to the side of the conductive connecting cover facing away from the conductive electrode column. The conductive connecting piece is used to connect to the electrode group of the secondary battery. Part of the conductive connection cover protrudes and is arranged toward the conductive connection piece, which facilitates the direct contact between the conductive connection piece and the conductive connection cover, and the conductive connection piece is connected to the electrode group, so that the conductive electrode column is electrically connected to the conductive connection piece through the protruding arrangement of the conductive connection cover, thereby making the electrical connection between the conductive connection piece and the electrode group unnecessary to be bent, facilitating the electrical contact between the conductive connection piece and the electrode group and effectively reducing the difficulty of bending the connection piece.

[0048] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A secondary battery cover structure, comprising: A substrate and a conductive connection assembly, wherein the substrate is used to connect to the shell of the secondary battery to cover the end cover of the shell, and the substrate is provided with a conductive connection hole communicating with the interior of the shell, characterized in that: The conductive connection assembly includes a conductive electrode column, a conductive connection cover, and a conductive connection sheet. The conductive connection cover is inserted into the conductive connection hole, and a portion of the conductive connection cover is located in the housing. The conductive electrode column is connected to the conductive connection cover. The conductive connection sheet is located in the housing and is connected to a side of the conductive connection cover facing away from the conductive electrode column. The conductive connection sheet is used to connect to the electrode group of the secondary battery. The conductive connection cover is provided with a first groove, the opening of the first groove being away from the conductive connection sheet, and at least a portion of the conductive electrode column is clamped in the first groove; the conductive connection cover is provided with a second groove communicating with the first groove, the second groove being used for through-welding of the conductive connection sheet and the conductive connection cover; the diameter of the second groove is smaller than that of the first groove; The conductive connection cover protrudes and is arranged toward the conductive connection piece so that the conductive connection piece contacts the conductive connection cover; the conductive connection piece is connected to the electrode group so that the conductive electrode column is electrically connected to the conductive connection piece through the protruding arrangement of the conductive connection cover; The conductive connection assembly further includes a fixing ring, which is located in the shell and sleeved on the conductive connection cover.

2. The secondary battery cover structure according to claim 1, wherein: The fixing ring has a fixing through hole, and the conductive connection cover is inserted into the fixing through hole and abuts against the conductive connection sheet.

3. The secondary battery cover structure according to claim 1, wherein: The conductive connection assembly also includes a sealing ring, which is located on the side of the substrate away from the conductive electrode column. At least part of the sealing ring is located in the conductive connection hole, and the sealing ring is respectively in contact with the inner wall of the conductive connection hole and the outer wall of the conductive connection cover.

4. The secondary battery cover structure according to claim 3, characterized in that: The conductive connection assembly also includes an insulating ring, which is located on the side of the substrate away from the sealing ring. At least part of the insulating ring is located in the conductive connection hole, and the insulating ring is respectively in contact with the inner wall of the conductive connection hole and the outer wall of the conductive connection cover.

5. The secondary battery cover structure according to claim 4, characterized in that: The insulating ring and the sealing ring abut against each other, and a receiving groove is formed between the insulating ring and the sealing ring. The opening of the receiving groove is away from the conductive connection cover, and the receiving groove accommodates a portion of the substrate.

6. A secondary battery, characterized in that: It comprises a battery shell, an electrode group and a secondary battery cover structure as described in any one of claims 1 to 5, wherein the electrode group is arranged in the battery shell, the secondary battery cover structure covers the installation opening of the battery shell, and the conductive connecting piece of the secondary battery cover structure is connected to the electrode group.

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