Top cover assembly, battery and preparation method of top cover assembly

Abstract

The invention discloses a top cover assembly and a preparation method of the top cover assembly of a battery, the top cover assembly comprises a pole, a sealing piece, a lower insulating piece, a top cover piece, a conductive piece, an upper insulating piece and an electric connecting piece, the electric connecting piece is provided with a mounting hole, and the electric connecting piece can penetrate into a cavity of the pole through the mounting hole. By arranging the hollow pole and arranging the mounting hole in the electric connecting piece, when the top cover assembly is assembled, the mounting base of the crimping tool can penetrate into the cavity of the pole, then the pole is sleeved with the sealing ring, the lower insulating piece, the top cover piece, the upper insulating piece and the conductive piece in sequence, then crimping is carried out, the riveting step is omitted, and the top cover assembly is assembled. Therefore, the conductive piece, the top cover piece, the connecting piece and the like cannot be subjected to transverse pressure during riveting of the pole, deformation is not prone to occurring, the thickness can be reduced, the overall thickness of the top cover assembly is reduced, and the internal space of the battery is further saved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and more specifically, to a top cover assembly, a battery, and a method for preparing the top cover assembly. Background Art

[0002] Lithium batteries are widely used in power batteries, energy storage batteries, and other technical fields. Power batteries provide power for tools, typically electric vehicles, electric trains, electric bicycles, golf carts, and other applications, and are core components of new energy vehicles. Energy storage batteries are commonly used in home energy storage, solar and wind power plants, portable power supplies, communication base stations, and as storage batteries for renewable energy. The two differ in their application scenarios, resulting in different performance and designs.

[0003] The above-mentioned battery usually includes multiple batteries, which are connected in series or in parallel to form a battery module. The battery is the smallest unit that constitutes the battery module. The battery includes a shell for containing electrolyte and positive and negative electrode materials of lithium batteries and a top cover assembly that seals the opening of the shell. The top cover assembly generally includes multiple parts such as an upper plastic part, a top cover sheet, a lower plastic part, a sealing ring, and electrodes. The electrode passes through the top cover sheet and the lower insulating sheet. One end of the electrode is located inside the battery and is used to electrically connect to the tab inside the battery. The other end of the electrode is located outside the battery and is used to be connected in parallel or in series with other batteries. The electrode includes a pole extending out of the top cover assembly and an electrical connector connected to the end of the pole located inside the battery. The electrical connector is used to connect the pole and the tab. The electrical connector is connected to the pole by welding.

[0004] In the prior art, after the top cover assembly is assembled, the pole is inserted into the reserved hole in the top cover plate, and then the pole is fixed by riveting. The connecting piece or the bottom of the pole swells and deforms due to the heat of riveting, which can easily cause the connecting piece or the pole to deform due to excessive riveting pressure, and uneven riveting can cause damage to the sealing ring. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned defects of the prior art and provide a top cover assembly, a battery and a method for preparing the top cover assembly, by improving the structure of the top cover assembly, eliminating riveting and preventing deformation of the poles and connecting pieces.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] A top cover assembly, comprising:

[0008] A pole, the pole comprising a top wall and side walls connected to each other, wherein the side walls and the top wall form a cavity;

[0009] A sealing member, the sealing member being sleeved outside the side wall;

[0010] lower insulation;

[0011] a top cover sheet, wherein the inner surface of the top cover sheet abuts against the lower insulating member, the pole passes through the lower insulating member and the top cover sheet, and the sealing member is located between the top cover sheet and the side wall;

[0012] A conductive member, the conductive member is arranged on the outside of the top cover sheet, and the conductive member is sleeved outside the side wall;

[0013] an upper insulating member, the upper insulating member being disposed between the conductive member and the top cover sheet;

[0014] An electrical connecting piece is provided on a side of the lower insulating member away from the top cover piece, the electrical connecting piece is electrically connected to the pole, and the electrical connecting piece is provided with a mounting hole, through which the electrical connecting piece can penetrate into the interior of the cavity.

[0015] The invention also discloses a battery, comprising the above-mentioned top cover assembly.

[0016] The present invention also discloses a method for preparing a top cover assembly, comprising the following steps:

[0017] A combined component of a pole and an electrical connection piece is provided, wherein the pole includes a top wall and a side wall, the side wall is connected to the top wall, the side wall and the top wall form a cavity, and the electrical connection piece is provided with a mounting hole;

[0018] Placing the combined component on a mounting base so that the mounting base extends from the mounting hole into the cavity;

[0019] A sealing member, a lower insulating member, a top cover sheet, an upper insulating member and a conductive member are sequentially sleeved on the pole, and then the conductive member and the top of the pole are crimped.

[0020] The implementation of the present invention will have the following beneficial effects:

[0021] The present invention provides a hollow pole and a mounting hole on the electrical connecting piece. When assembling the top cover assembly, the mounting base of the crimping tool can penetrate into the cavity of the pole. Then, the sealing ring, the lower insulating member, the top cover piece, the upper insulating member and the conductive member are sequentially sleeved on the pole, and then crimped, eliminating the riveting step. In this way, the conductive member, the top cover piece, the connecting piece, etc. will not be subjected to the lateral pressure during the riveting of the pole. Not only are they not easily deformed, but their thickness can also be reduced, thereby reducing the overall thickness of the top cover assembly and further saving the internal space of the battery.

[0022] Invention drawings

[0023] In order to more clearly describe the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] in:

[0025] Figure 1 It is a structural schematic diagram of a top cover assembly provided by an embodiment of the present invention.

[0026] Figure 2 yes Figure 1 A cross-sectional view along the A-A' direction.

[0027] Figure 3 yes Figure 1 Another cross-sectional view in the A-A' direction.

[0028] Figure 4 yes Figure 1 A structural diagram of a China Electric connecting piece.

[0029] Figure 5 yes Figure 1 Another cross-sectional view along the A-A' direction.

[0030] Figure 6 yes Figure 1 Another structural diagram of the China Electric connecting piece.

[0031] Figure 7 yes Figure 1 Another cross-sectional view along the A-A' direction.

[0032] Figure 8 yes Figure 1 Another structural diagram of the China Electric connecting piece.

[0033] Figure 9 yes Figure 1 Another structural diagram of the China Electric connecting piece.

[0034] Figure 10 It is a partial bottom view of the top cover assembly provided by an embodiment of the present invention.

[0035] Figure 11 yes Figure 1 A partial cross-section taken along the BB' direction.

[0036] Figure 12 yes Figure 1 Another cross-sectional view along the A-A' direction.

[0037] 1-pole, 11-top wall, 111-positioning portion, 12-side wall, 13-cavity, 14-pressing portion, 141-settling step, 15-buffer portion, 16-positioning protrusion, 17-clamping portion, 2-sealing member, 3-lower insulating member, 31-fastening clamping structure, 4-top cover plate, 5-conductive member, 51-extension portion, 6-upper insulating member, 7-electrical connecting piece, 71-mounting hole, 72-connecting portion, 721-accommodating groove, 73-electrical connecting portion, 731-fastening clamping protrusion, 732-hollow area, 74-clamping structure, 75-hollow protrusion. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] refer to Figure 1 and Figure 2 The present invention discloses a top cover assembly, comprising: a pole 1, a seal 2, a lower insulating member 3, a top cover sheet 4, a conductive member 5, an upper insulating member 6 and an electrical connecting sheet 7.

[0040] The pole 1 includes a top wall 11 and side walls 12 . The side walls 12 are connected to the top wall 11 , and the side walls 12 and the top wall 11 form a cavity 13 .

[0041] The sealing member 2 is sleeved on the outside of the side wall 12 .

[0042] The inner surface of the top cover plate 4 abuts against the lower insulating member 3 , the pole 1 passes through the lower insulating member 3 and the top cover plate 4 , and the sealing member 2 is located between the top cover plate 4 and the pole 1 .

[0043] The conductive member 5 is disposed on the outside of the top cover 4 , and the conductive member 5 is sleeved outside the side wall 12 .

[0044] The upper insulating member 6 is disposed between the conductive member 5 and the top cover plate 4 .

[0045] The electrical connecting piece 7 is arranged on the side of the lower insulating member 3 away from the top cover piece 4. The electrical connecting piece 7 is electrically connected to the pole 1. The electrical connecting piece 7 is provided with a mounting hole 71, through which the electrical connecting piece 7 can penetrate into the cavity 13.

[0046] Optional, see Figure 2The electrical connection piece 7 can be connected to the pole 1 by snapping, and the pole 1 can be crimped and then the electrical connection piece 7 and the pole 1 can be snap-fitted and welded to avoid deformation of the electrical connection piece 7 when the pole 1 is crimped. Preferably, the snap-fit ​​connection between the electrical connection piece 7 and the pole 1 is a tight snap-fit ​​connection, which can be achieved by interference fit, setting a snap-fit ​​structure, etc. Figure 12 The pole 1 can be integrally formed with the connecting piece 7 to reduce the number of welding steps.

[0047] It can be understood that the pole 1 in this embodiment is a hollow pole 1, and the cavity 13 reduces the weight of the pole 1, reduces the overall mass of the battery, and achieves lightweighting. The space saved by the cavity 13 can accommodate more active materials, thereby improving the energy density of the battery.

[0048] In this embodiment, the top cover assembly is assembled by providing a hollow pole 1 to eliminate riveting. When assembling the top cover assembly, the mounting base of the crimping tool extends into the cavity 13 of the pole 1 through the mounting hole 71. The sealing member 2, the lower insulating member 3, the top cover sheet 4, the upper insulating member 6 and the conductive member 5 are sequentially mounted on the pole 1. Then, the crimping tool crimps the conductive member 5 and the top of the pole 1.

[0049] The top cover assembly is riveted, so the conductive member 5, top cover plate 4, electrical connection plate 7, etc. will not be subjected to the lateral pressure when the pole 1 is riveted, so their thickness can be reduced, reducing the overall thickness of the top cover assembly and further saving the internal space of the battery.

[0050] Specifically, in this embodiment, the sealing member 22 may be the sealing member 2 , which is located between the top cover 4 and the pole 1 to ensure that the battery has good sealing performance.

[0051] The upper insulating member 6 and the lower insulating member 3 can be made of materials such as silicone rubber and styrene-butadiene rubber. These materials have good corrosion resistance and sealing properties and can effectively prevent battery liquid leakage.

[0052] The conductive member 5 is a metal block that can conduct electricity. A receiving groove can be provided at the end of the conductive member 5 near the top wall 11. The receiving groove accommodates the melted material during the welding process of the conductive member 5 and the pole 1, compensates for the welding excess height, reduces the influence of the weld height on the size of the top cover assembly, and can also increase the welding area, improve the welding strength, and improve the welding quality of the top cover assembly.

[0053] In some optional embodiments, referring to Figure 2 The pole 1 also includes a pressing portion 14, which is connected to the end of the side wall 12 away from the top wall 11. The pressing portion 14 is located on the side of the lower insulating member 3 away from the top cover sheet 4, and the pressing portion 14 is located directly below the sealing member 22.

[0054] In this embodiment, a pressing portion 14 is provided, which cooperates with the conductive member 5 to press the sealing member 2. The pressing portion 14 provides axial support force, and the connecting piece can only play a conductive role and does not need to play a supporting role in pressing the sealing member 2, so the thickness of the connecting piece can be reduced.

[0055] Furthermore, the thickness of the pressing portion 14 is greater than or equal to the thickness of the side wall 12 ; the thick pressing portion 14 can provide better support for the seal 2 and prevent the electrical connection piece 7 from being deformed when the pole 1 is crimped.

[0056] Furthermore, the thickness of the side wall 12 is greater than or equal to the thickness of the top wall 11 .

[0057] Preferably, the thickness of the pressing portion 14 is greater than that of the side wall 12 . In this embodiment, the pole 1 does not need to be riveted, which can reduce the thickness of the top wall 11 , reduce weight, and save space.

[0058] Further, refer to Figure 2 A sinking step 141 is provided at the end of the pressing portion 14 away from the cavity 13 , and the electrical connecting piece 7 engages with the sinking step 141 , which can reduce the thickness of the top cover assembly and increase the internal volume of the battery.

[0059] In some optional embodiments, referring to Figure 4 In this embodiment, the electrical connection piece 7 further includes a connection portion 72 and an electrical connection portion 73. The mounting hole 71 is provided on the connection portion 72. The electrical connection portion 73 is connected to the connection portion 72 and is used for welding to the tab. Furthermore, the connection portion 72 is connected to the side wall 12 or the pressing portion 14 of the terminal 1.

[0060] Furthermore, the electrical connection piece 7 is provided with a snap-fit ​​structure 74 . The snap-fit ​​structure 74 is located at the edge of the mounting hole 71 , and the snap-fit ​​structure 74 is snap-fitted and connected to the pole 1 .

[0061] Optional, see Figure 3 、 Figure 4 The engaging structure 74 is a protrusion, and the protrusion is used to engage with the pole 1.

[0062] In one specific embodiment, a protrusion is located at the edge of the mounting hole 71 and engages with the inner cavity 13 of the terminal 1. This engagement with the cavity 13 of the terminal 1 serves as a positioning mechanism during installation. It also increases the welding area between the connecting piece and the terminal 1, strengthening the weld. In this embodiment, the electrical connecting piece 7 is superimposed below the pressing portion 14, increasing the thickness of the pressing portion 14 and thereby enhancing its axial support force. This provides greater and more stable axial compression to the sealing ring, enhancing the sealing effect.

[0063] In another specific embodiment, the protrusion is formed by bending the connecting portion 72. The connecting portion 72 is bent toward the inner cavity of the pole 1 to form the protrusion, eliminating the need for separate welding of the protrusion component, thereby reducing assembly steps.

[0064] Reference Figure 4 The end of the connecting portion 72 away from the mounting hole 71 is bent toward the lower insulating member 3, so that the electrical connecting portion 73 is closer to the lower insulating member 3, saving internal space of the battery.

[0065] Optional, see Figure 5 、 Figure 6 The engaging structure 74 is a groove, and the groove is used for engaging and connecting with the pole 1.

[0066] In one embodiment, the groove is located at the edge of the mounting hole 71 and is engaged with the end of the side wall 12 or the pressing portion 14. Compared to the groove, the electrical connection portion 73 of the electrical connection sheet 7 is closer to the lower insulating member 3, saving space inside the battery cell, providing more space for the electrolyte, and improving the volumetric energy density and mass energy density of the battery.

[0067] Furthermore, the connecting portion 72 protrudes away from the pole 1 to form a groove, that is, the entire connecting portion 72 protrudes away from the pole 1 to form a groove. Alternatively, the connecting portion 72 is recessed away from the pole 1 to form a groove, that is, the side of the connecting portion 72 closest to the pole 1 is recessed away from the pole 1 to form a groove, and the depth of the groove is less than the thickness of the connecting portion 72. When the connecting portion 72 protrudes away from the pole 1 to form a groove, or when the connecting portion 72 is recessed away from the pole 1 to form a groove, there is no need to separately weld the groove component, thus reducing the number of assembly steps.

[0068] In some optional embodiments, referring to Figure 7 、 Figure 8 The electrical connection piece 7 is provided with a hollow protrusion 75 extending toward the pole 1 at the edge of the mounting hole 71 , and the hollow protrusion 75 is engaged in the cavity 13 of the pole 1 .

[0069] It is understood that the electrical connection piece 7 is provided with a hollow protrusion 75, which is positioned and engaged with the cavity 13 of the pole 1. The hollow protrusion 75 extends into the pole 1 to increase the contact area with the pole 1, thereby improving the efficiency of power transmission and reducing power loss. In this embodiment, the hollow protrusion 75 can be welded to the pole 1 to prevent the heat from damaging the lower insulator 3 and the sealing ring 2.

[0070] In a specific embodiment, the electrical connection sheet 7 further includes a connection portion 72 and an electrical connection portion 73 . The connection portion 72 is arranged around the hollow protrusion 75 . The electrical connection portion 73 is connected to the connection portion 72 . The electrical connection portion 73 is used for welding to the tab.

[0071] Reference Figure 8The end of the connecting portion 72 away from the hollow protrusion 75 is bent toward the lower insulating member 3, so that the electrical connecting portion 73 is closer to the lower insulating member 3, saving internal space of the battery.

[0072] Reference Figure 9 An electrical receiving groove 721 is provided on the connecting portion 72, and the electrical receiving groove 721 is used to receive the end of the pole 1. Compared with the electrical receiving groove 721, the electrical connecting portion 73 of the electrical connecting sheet 7 is closer to the lower insulating member 3, saving the internal space of the battery cell, providing more space for the electrolyte, and improving the volume energy density and mass energy density of the battery.

[0073] In some optional embodiments, referring to Figure 8 , the thickness of the electrical connection portion 73 is less than or equal to the thickness of the connection portion 72 .

[0074] Preferably, the thickness of the electrical connection portion 73 is smaller than that of the connection portion 72 , and there is a thickness transition from the connection portion 72 to the electrical connection portion 73 , which facilitates bending and welding, saves internal battery space, and increases the capacity of the single battery.

[0075] In a specific embodiment, the electrical connection portion 73 formed after the connecting piece is stamped intersects with the connecting portion 72. When the pole 1 and the connecting piece are connected by welding, the sealing member 22 area is avoided during welding, and the welding heat will not affect the sealing member 22. After the welding is completed, the electrical connection portion 73 is welded to the pole ear, wherein the pole ear can be welded on the side of the electrical connection portion 73 close to the pole 1 or welded on the side of the electrical connection portion 73 away from the pole 1. After the pole ear is welded, it is folded and flattened so that the electrical connection portion 73 is flush with the connecting portion 72, thereby reducing the space occupied by the electrical connection portion 73.

[0076] In one embodiment, referring to Figure 10 A fastening structure 31 is provided on the side of the lower insulator 3 facing away from the top cover 4. The electrical connection portion 73 of the electrical connection piece 7 is fastened to the fastening structure 31. The fastening structure 31 includes a hook that engages with the hook after the electrical connection portion 73 is welded to the tab and folded flat. The hook limits the electrical connection portion 73, preventing it from loosening and deforming when crimping the terminal 1, and preventing it from jumping after being folded flat, which could affect battery overcurrent during operation.

[0077] In another embodiment, referring to Figure 11The side of the lower insulating member 3 facing away from the top cover 4 is provided with a fastening snap-fit ​​structure 31, which encloses and forms a snap-fit ​​cavity. The side of the electrical connection portion 73 close to the lower insulating member 3 is provided with a fastening snap-fit ​​protrusion 731, which snaps into engagement with the snap-fit ​​cavity. Furthermore, the width of the snap-fit ​​cavity close to the electrical connection portion 73 is smaller than the width of the side facing away from the electrical connection portion 73, preventing the fastening snap-fit ​​protrusion 731 from falling out of the snap-fit ​​cavity. After the electrical connection portion 73 of the connecting piece is folded flat, the fastening snap-fit ​​protrusion 731 snaps into engagement with the lower insulating member 3, preventing the connecting piece from jumping and affecting battery overcurrent during battery operation.

[0078] Further, refer to Figure 9 The electrical connection portion 73 is further provided with a hollow area 732 , and the pole ear (not shown in the figure) passes through the hollow area 732 and is connected to the side of the electrical connection portion 73 close to the pole 1 .

[0079] It should be noted that the tab can be welded to the side of the electrical connection portion 73 close to the pole 1 or to the side of the electrical connection portion 73 away from the pole 1. When the tab is welded to the side of the electrical connection portion 73 away from the pole 1, the electrical connection portion 73 can be directly folded flat, and there is a gap between the electrical connection portion 73 and the lower insulating member 3 to avoid the thickness of the tab, which will not affect the overcurrent of the battery.

[0080] When the tab passes through the hollow area 732 of the electrical connection part 73, the tab is welded on the side of the electrical connection part 73 close to the pole 1. The gap between the electrical connection part 73 and the lower insulating part 3 can accommodate the tab, avoiding interference and not affecting the overcurrent. At the same time, the heat of the connecting piece during welding will not affect the lower insulating part 3.

[0081] In some optional embodiments, referring to Figure 2 A buffer portion 15 is provided at the end of the top wall 11 close to the side wall 12 , and the buffer portion 15 is used to buffer the deformation of the side wall 1 .

[0082] In this embodiment, when the pole 1 is installed, the mounting base is extended into the cavity 13, and the mounting tool is crimped on the upper surface of the top wall 11 to compress the pole 1. The top wall 11 is provided with a buffer portion 15 to provide a buffer during crimping, thereby preventing the side wall 12 from being deformed due to the pressure of crimping, thereby ensuring the stability of the pole 1 structure. In this way, the side wall 12 and the top wall 11 of the pole 1 can be set to a thinner thickness, further reducing the thickness of the top cover assembly.

[0083] Furthermore, the thickness of the buffer portion 15 is less than that of the top wall 11. Specifically, the buffer portion 15 is formed by reducing the material of the top wall 11 along the thickness direction. The buffer portion 15 is formed by reducing the material of the top wall 11 along the thickness direction on both the upper and lower surfaces of the top wall 11. A buffer groove is formed between the buffer portion 15 and the top wall 11 to disperse the pressure and prevent deformation of the side wall 12 during crimping.

[0084] In some optional embodiments, the pole 1 and the conductive member 5 are interference fit.

[0085] In this embodiment, the top cover assembly is riveted. If there is a gap between the conductive member 5 and the pole 1 during installation, it cannot be eliminated. Therefore, the pole 1 and the conductive member 5 are designed to have an interference fit. The crimping tooling is used to ensure that there is no gap between the conductive member 5 and the pole 1, thus avoiding any impact on conductivity. In this embodiment, the interference fit primarily refers to the interface where the pole 1 and the conductive member 5 connect.

[0086] In one embodiment, referring to Figure 2 The end of the pole 1 close to the top wall 11 is further provided with a clamping portion 17 protruding toward the conductive member 5 , and the clamping portion 17 is clamped and connected with the conductive member 5 .

[0087] Furthermore, the clamping portion 17 is a flange structure and is integrally formed with the pole 1, thereby reducing welding steps.

[0088] In this embodiment, the conductive member 5 is engaged with the clamping portion 17 . Therefore, even if there is a size error between the conductive member 5 and the pole 1 , a connection surface still exists between the conductive member 5 and the pole 1 , and no gap will be formed during welding to affect conductivity.

[0089] In a specific embodiment, the side wall 12 is an inclined side wall 12 (not shown in the figure), and the end size of the inclined side wall 12 close to the top wall 11 is smaller than the end size of the inclined side wall 12 close to the electrical connection piece 7; the inner wall of the conductive part 5 is an inclined inner wall, and the end size of the inclined inner wall close to the electrical connection piece 7 is smaller than the end size of the inclined inner wall away from the electrical connection piece 7; the inclined side wall 12 abuts against the inclined inner wall.

[0090] In this embodiment, the side walls 12 of the conductive member 5 and the pole 1 are respectively arranged tilted. Therefore, when there is a size error between the conductive member 5 and the pole 1, there is still a connection surface between the conductive member 5 and the pole 1, which will not cause a gap during welding to affect conductivity.

[0091] In one embodiment, referring to Figure 7 The end of the conductive member 5 connected to the side wall 12 is provided with an extension portion 51 . The extension portion 51 is located between the top cover piece 4 and the side wall 12 , and the extension portion 51 abuts against the side wall 12 .

[0092] In this embodiment, the extension portion 51 increases the contact area with the pole 1 and improves the conductivity.

[0093] In some optional embodiments, referring to Figure 2 The top wall 11 of the pole 1 is further provided with a positioning portion 111 , and the positioning portion 111 is located at the center of the top wall 11 .

[0094] Specifically, the positioning portion 111 is a groove, and the crimping tool is engaged with the positioning portion 111 for positioning. Further, the groove is formed by the top wall 11 being recessed toward the cavity 13 .

[0095] In another embodiment, referring to Figure 2 A positioning protrusion 16 is also provided on the surface of the top wall 11 on the side adjacent to the cavity 13, protruding toward the cavity 13. During assembly of the hollow terminal 1, if the electrical connection piece 7 is provided with a mounting hole 71, the mounting fixture base extends through the mounting hole 71 into the cavity 13 of the terminal 1. The positioning protrusion 16 engages with the mounting fixture base, thereby positioning the hollow terminal 1 and preventing deviation in the crimping position. If the electrical connection piece 7 is provided with a hollow protrusion 75, the hollow protrusion 75 engages with the positioning protrusion 16 to position the hollow terminal 1.

[0096] The present invention also provides a battery, comprising the top cover assembly of any one of the above embodiments.

[0097] The present invention also provides a method for preparing a top cover assembly, comprising the following steps:

[0098] (1) A combination component of a pole 1 and an electrical connection piece 7 is provided. The pole 1 includes a top wall 11 and a side wall 12. The side wall 12 is connected to the top wall 11. The side wall 12 and the top wall 11 enclose a cavity 13. The electrical connection piece 7 is provided with a mounting hole 71.

[0099] (2) Place the assembled component on the mounting base so that the mounting base extends from the mounting hole 71 into the cavity 13 .

[0100] (3) The sealing member 2, the lower insulating member 3, the top cover 4, the upper insulating member 6 and the conductive member 5 are sequentially mounted on the pole 1, and then the conductive member 5 and the top of the pole 1 are crimped.

[0101] (4) Welding the pole 1 and the conductive member 5.

[0102] In this embodiment, the top cover assembly does not need to be riveted, and only the conductive member 5 and the upper surface of the pole 1 are crimped. The crimping will not cause significant deformation of the side wall 12 of the pole 1 or the electrical connection piece 7.

[0103] In this embodiment, the combined component of the pole 1 and the electrical connection piece 7 can be formed as one piece or separately.

[0104] In a specific embodiment, when the combined component is formed separately, after the pole and the conductive member are welded, the electrical connection piece 7 is assembled with the pole 1 and welded into one body.

[0105] In another specific embodiment, when the combined component is formed separately, the method for preparing the top cover assembly includes the following steps:

[0106] (1) A combination component of a pole 1 and an electrical connection piece 7 is provided, and the pole 1 and the electrical connection piece 7 are engaged. The pole 1 includes a top wall 11 and a side wall 12. The side wall 12 is connected to the top wall 11. The side wall 12 and the top wall 11 enclose a cavity 13. The electrical connection piece 7 is provided with a mounting hole 71.

[0107] (2) Place the assembled component on the mounting base so that the mounting base extends from the mounting hole 71 into the cavity 13 .

[0108] (3) The sealing member 2, the lower insulating member 3, the top cover plate 4, the upper insulating member 6 and the conductive member 5 are sequentially mounted on the pole 1. A fastening structure 31 is provided on the side of the lower insulating member 3 facing away from the top cover plate 4. The electrical connection plate 7 is engaged with the fastening structure 31, and then the conductive member 5 and the top of the pole 1 are crimped.

[0109] (4) Welding the pole 1 and the conductive member 5.

[0110] (5) Weld the electrical connection piece 7 to the pole 1.

[0111] In this embodiment, the electrical connection piece 7 is engaged with the fastening engagement structure 31. When the mounting base only extends into the cavity 13 and does not contact other components, the electrical connection piece 7 is engaged with the lower insulating member 3 through the fastening engagement structure 31 to prevent the electrical connection piece 7 from moving and improve structural stability.

[0112] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person skilled in the art would be able to make various modifications 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 top cover assembly, characterized in that: include: A pole, the pole comprising a top wall and side walls connected to each other, wherein the side walls and the top wall form a cavity; A sealing member, the sealing member being sleeved outside the side wall; lower insulation; a top cover sheet, wherein the inner surface of the top cover sheet abuts against the lower insulating member, the pole passes through the lower insulating member and the top cover sheet, and the sealing member is located between the top cover sheet and the side wall; A conductive member, the conductive member is arranged on the outside of the top cover sheet, and the conductive member is sleeved outside the side wall; an upper insulating member, the upper insulating member being disposed between the conductive member and the top cover sheet; An electrical connecting piece is provided on a side of the lower insulating member away from the top cover piece, the electrical connecting piece is electrically connected to the pole, and the electrical connecting piece is provided with a mounting hole, through which the electrical connecting piece can penetrate into the interior of the cavity.

2. The top cover assembly according to claim 1, wherein: The end portion of the conductive member connected to the side wall is provided with a bending portion, the bending portion is located between the top cover sheet and the side wall, and the bending portion abuts against the side wall.

3. The top cover assembly according to claim 1, wherein: The pole is interference-fitted with the conductive member.

4. The top cover assembly according to claim 1, characterized in that: The end of the pole close to the top wall is further provided with a clamping portion protruding toward the conductive member, and the clamping portion is clamped and connected with the conductive member.

5. The top cover assembly according to claim 1, characterized in that: The side wall is an inclined side wall, and the dimension of the end of the inclined side wall close to the top wall is smaller than the dimension of the end of the inclined side wall close to the electrical connection piece; The inner wall of the conductive member is an inclined inner wall, and the dimension of the end of the inclined inner wall close to the electrical connection piece is smaller than the dimension of the end of the inclined inner wall away from the electrical connection piece; The inclined side wall abuts against the inclined inner wall.

6. The top cover assembly according to any one of claims 1 to 5, characterized in that: A buffer portion is provided at an end of the top wall close to the side wall.

7. The top cover assembly according to claim 6, wherein: The pole further includes a pressing portion connected to the end of the side wall away from the top wall, located on a side of the lower insulating member away from the top cover sheet, and directly below the sealing member.

8. The top cover assembly according to claim 7, wherein: The thickness of the pressing portion is greater than or equal to the thickness of the side wall; And / or, the thickness of the side wall is greater than or equal to the thickness of the top wall.

9. The top cover assembly according to claim 1, wherein: A fastening and locking structure is provided on the lower insulating member, and the fastening and locking structure is locked and connected with the electrical connecting piece.

10. A battery, characterized in that: The utility model comprises a top cover assembly as claimed in any one of claims 1 to 9.

11. A method for preparing a top cover assembly, characterized in that: The following processes are included: A combined component of a pole and an electrical connection piece is provided, wherein the pole includes a top wall and a side wall, the side wall is connected to the top wall, the side wall and the top wall form a cavity, and the electrical connection piece is provided with a mounting hole; Placing the combined component on a mounting base so that the mounting base extends from the mounting hole into the cavity; Sequentially sleeve a sealing member, a lower insulating member, a top cover sheet, an upper insulating member, and a conductive member on the pole, and then crimp the conductive member and the top of the pole; The pole and the conductive member are welded.

Images