Top cover assembly and battery

Abstract

The utility model discloses a top cover assembly and battery, top cover assembly includes top cover assembly includes pole, sealing element, lower insulating part, top cover sheet, conducting part, upper insulating part and electrically connected sheet, and electrically connected sheet is equipped with mounting hole, and through mounting hole can go in to the cavity inside pole. Through setting hollow pole and setting mounting hole on electrically connected sheet, when assembling top cover assembly, make the installation base of crimping tool can go in to the cavity of pole, then, in order, set sealing ring, lower insulating part, top cover sheet, upper insulating part and conducting part on pole, then carry out crimping, cancel riveting step, make conducting part, top cover sheet, connecting sheet etc.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and more specifically, to a top cover assembly and a battery. Background Technology

[0002] Lithium-ion batteries are widely used in power batteries, energy storage batteries, and other technological fields. Power batteries provide power for tools, typically powering electric vehicles, electric trains, electric bicycles, golf carts, and other similar vehicles, and are core components of new energy vehicles. Energy storage batteries are commonly used in home energy storage, power stations for solar and wind power generation equipment, portable power supplies, communication base stations, and as batteries for storing renewable energy. The two types of batteries have different application scenarios, and their performance and design differ.

[0003] The aforementioned battery typically comprises multiple batteries connected in series or parallel to form a battery module. The battery is the smallest unit constituting the battery module. Each battery includes a housing for containing the electrolyte and the positive and negative electrode materials of the lithium battery, and a top cover assembly that seals the housing opening. The top cover assembly generally includes an upper plastic part, a top cover sheet, a lower plastic part, a sealing ring, electrodes, and other components. The electrodes pass through the top cover sheet and the lower insulating sheet. One end of the electrode is located inside the battery for electrical connection with the internal tabs, while the other end is located outside the battery for parallel or series connection with other batteries. The electrodes include a terminal post extending from the top cover assembly and an electrical connecting piece connecting the terminal post to its internal end. The electrical connecting piece connects the terminal post and the tabs, and is connected to the terminal post 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 riveted and fixed. The connecting piece or the bottom of the pole bulges and deforms due to the riveting heating. Excessive riveting pressure can easily cause deformation of the connecting piece or pole, and uneven riveting can lead to damage to the sealing ring. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned defects in the prior art and provide a top cover assembly and battery. By improving the structure of the top cover assembly, the riveting is eliminated, and the deformation of the poles and connecting pieces is prevented.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A top cover assembly, comprising:

[0008] An electrode post, the electrode post comprising a connected top wall and a side wall, the side wall and the top wall forming a cavity;

[0009] A sealing element, wherein the sealing element is sleeved outside the side wall;

[0010] Lower insulation component;

[0011] A top cover sheet, the inner surface of which abuts against the lower insulating member, the pole penetrating the lower insulating member and the top cover sheet, and the sealing member located between the top cover sheet and the side wall;

[0012] A conductive element is disposed on the outside of the top cover plate and sleeved on the outside of the side wall;

[0013] An upper insulating member is disposed between the conductive member and the top cover plate;

[0014] An electrical connector is disposed on the side of the lower insulator opposite to the top cover plate. The electrical connector is electrically connected to the pole. The electrical connector has a mounting hole through which it can extend into the cavity.

[0015] This utility model also discloses a battery, including the aforementioned top cover assembly.

[0016] Implementing the embodiments of this utility model will have the following beneficial effects:

[0017] This invention, by setting hollow poles and mounting holes on electrical connecting pieces, allows the mounting base of the crimping fixture to penetrate deep into the cavity of the poles during the assembly of the top cover assembly. Then, a sealing ring, a lower insulating component, a top cover piece, an upper insulating component, and a conductive component are sequentially fitted onto the poles before crimping. This eliminates the riveting step, preventing the conductive components, top cover piece, connecting pieces, etc., from being subjected to lateral pressure during pole riveting. This not only makes them less prone to deformation but also allows for a reduction in their thickness, thus reducing the overall thickness of the top cover assembly and further saving internal battery space. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] in:

[0020] Figure 1 This is a schematic diagram of a top cover assembly provided in an embodiment of the present utility model.

[0021] Figure 2 yes Figure 1 A cross-sectional view along line A-A'.

[0022] Figure 3 yes Figure 1 Another cross-sectional view along the A-A' direction.

[0023] Figure 4 yes Figure 1 A schematic diagram of a type of electrical connector.

[0024] Figure 5 yes Figure 1 Another cross-sectional view along the A-A' direction.

[0025] Figure 6 yes Figure 1 Another structural schematic diagram of the electrical connector.

[0026] Figure 7 yes Figure 1 Another cross-sectional view along the A-A' direction.

[0027] Figure 8 yes Figure 1 Another structural schematic diagram of the electrical connector.

[0028] Figure 9 yes Figure 1 Another structural schematic diagram of the electrical connector.

[0029] Figure 10 This is a partial bottom view of the top cover assembly provided in an embodiment of the present utility model.

[0030] Figure 11 yes Figure 1 A partial cross-sectional view along the B-B' direction.

[0031] Figure 12 yes Figure 1 Another cross-sectional view along the A-A' direction.

[0032] 1-Pole post, 11-Top wall, 111-Positioning part, 12-Side wall, 13-Cavity, 14-Pressure part, 141-Settling step, 15-Buffer part, 16-Positioning protrusion, 17-Snap-fit ​​part, 2-Sealing element, 3-Lower insulating element, 31-Fastening locking structure, 4-Top cover plate, 5-Conductive element, 51-Extension part, 6-Upper insulating element, 7-Electrical connection piece, 71-Mounting hole, 72-Connecting part, 721-Receiving groove, 73-Electrical connection part, 731-Fastening locking protrusion, 732-Hollowed area, 74-Snap-fit ​​structure, 75-Hollow protrusion. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] refer to Figure 1 and Figure 2 This utility model discloses a top cover assembly, including: a pole post 1, a sealing element 2, a lower insulating element 3, a top cover plate 4, a conductive element 5, an upper insulating element 6, and an electrical connecting piece 7.

[0035] The pole post 1 includes a top wall 11 and a side wall 12. The side wall 12 is connected to the top wall 11, and the side wall 12 and the top wall 11 form a cavity 13.

[0036] The sealing element 2 is installed outside the side wall 12.

[0037] The inner surface of the top cover plate 4 abuts against the lower insulating member 3, the pole post 1 penetrates 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 post 1.

[0038] The conductive element 5 is disposed on the outside of the top cover plate 4 and is sleeved on the outside of the side wall 12.

[0039] Upper insulating member 6 is disposed between conductive member 5 and top cover plate 4.

[0040] Electrical connector 7 is located on the side of the lower insulating member 3 away from the top cover plate 4. Electrical connector 7 is electrically connected to the pole post 1. Electrical connector 7 is provided with mounting hole 71, which can be extended into the cavity 13.

[0041] Optional, refer to Figure 2 The electrical connector 7 can be engaged with the terminal 1. After pressing the terminal 1, the electrical connector 7 can be welded to the terminal 1. Deformation of the electrical connector 7 should be avoided during the pressing of the terminal 1. Preferably, the engagement between the electrical connector 7 and the terminal 1 is a tight engagement, which can be achieved through interference fit, snap-fit ​​structure, etc. (Refer to...) Figure 12 The pole post 1 can be integrally formed with the connecting piece 7, reducing welding steps.

[0042] It is understood that in this embodiment, the electrode post 1 is a hollow electrode post 1, and the cavity 13 reduces the weight of the electrode post 1, reduces the overall weight of the battery, and achieves lightweighting. The space saved by the cavity 13 can accommodate more active materials and improve the energy density of the battery.

[0043] In this embodiment, the top cover assembly eliminates the need for riveting by setting a hollow pole post 1. During the assembly of the top cover assembly, the mounting base of the pressing tool extends into the cavity 13 of the pole post 1 through the mounting hole 71. The sealing element 2, the lower insulating element 3, the top cover plate 4, the upper insulating element 6, and the conductive element 5 are sequentially fitted onto the pole post 1. Then, the pressing tool presses the conductive element 5 and the top of the pole post 1.

[0044] If the riveting of the top cover assembly is eliminated, the conductive parts 5, top cover sheet 4, electrical connection sheet 7, etc. will not be subjected to the lateral pressure when the pole post 1 is riveted, so their thickness can be reduced, reducing the overall thickness of the top cover assembly and further saving internal space of the battery.

[0045] Specifically, in this embodiment, the seal 22 can be the seal 2, which is located between the top cover plate 4 and the terminal post 1 to ensure that the battery has good sealing performance.

[0046] The upper insulating component 6 and the lower insulating component 3 can be made of materials such as silicone rubber and styrene-butadiene rubber. These materials have good corrosion resistance and sealing properties, which can effectively prevent battery liquid leakage.

[0047] The conductive component 5 is a metal block that can conduct electricity. A receiving groove can also be provided at the end of the conductive component 5 near the top wall 11. The receiving groove can accommodate the material molten during the welding process between the conductive component 5 and the pole post 1, compensate for the welding height, reduce the influence of the weld height on the size of the top cover assembly, increase the welding area, improve the welding strength, and improve the welding quality of the top cover assembly.

[0048] In some alternative embodiments, refer to Figure 2 The pole post 1 also includes a pressing part 14, which is connected to the end of the side wall 12 that is away from the top wall 11. The pressing part 14 is located on the side of the lower insulating member 3 that is away from the top cover plate 4, and the pressing part 14 is located directly below the sealing member 22.

[0049] In this embodiment, by setting a pressing part 14, the pressing part 14 cooperates with the conductive part 5 to press the sealing part 2. The pressing part 14 provides axial support force, and the connecting piece can only play a conductive role without playing a supporting role in pressing the sealing part 2, thus reducing the thickness of the connecting piece.

[0050] Furthermore, the thickness of the pressing part 14 is greater than or equal to the thickness of the side wall 12; the thicker pressing part 14 can provide better support for the seal 2 and also prevent the electrical connection piece 7 from deforming when the pole post 1 is pressed.

[0051] Furthermore, the thickness of the sidewall 12 is greater than or equal to the thickness of the topwall 11.

[0052] Preferably, the thickness of the pressing part 14 is greater than the thickness 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.

[0053] Furthermore, referring to Figure 2 The end of the pressing part 14 away from the cavity 13 is provided with a settling step 141. The electrical connecting piece 7 engages with the settling step 141, which can reduce the thickness of the top cover assembly and increase the internal volume of the battery.

[0054] In some alternative embodiments, refer to Figure 4 In this embodiment, the electrical connector 7 further includes a connecting portion 72 and an electrical connecting portion 73. A mounting hole 71 is provided on the connecting portion 72, and the electrical connecting portion 73 is connected to the connecting portion 72. The electrical connecting portion 73 is used for welding to the electrode tab. Further, the connecting portion 72 is connected to the side wall 12 or the pressing portion 14 of the electrode post 1.

[0055] Furthermore, the electrical connector 7 is provided with a snap-fit ​​structure 74, which is located at the edge of the mounting hole 71 and snaps into the pole post 1.

[0056] Optional, refer to Figure 3 , Figure 4 The engaging structure 74 is a protrusion, which is used to engage and connect with the pole post 1.

[0057] In one specific embodiment, the protrusion is located at the edge of the mounting hole 71 and engages with the inner cavity 13 of the pole post 1. The protrusion, by engaging with the cavity 13 of the pole post 1, serves a positioning function during installation. Simultaneously, the protrusion increases the welding area when the connecting piece is welded to the pole post 1, making the weld more robust. In this embodiment, the electrical connecting piece 7 is superimposed below the pressing portion 14, which can enhance the thickness of the pressing portion 14, thereby increasing the axial support force of the pressing portion 14. This provides a larger and more stable axial compression to the sealing ring, enhancing the sealing effect.

[0058] In another specific embodiment, the protrusion is formed by a bent connecting portion 72. The connecting portion 72 is bent towards the inner cavity of the pole post 1 to form the protrusion, eliminating the need for separate welding of the protruding component and reducing assembly steps.

[0059] Reference Figure 4 The end of the connecting part 72 that is away from the mounting hole 71 is bent towards the lower insulating member 3, so that the electrical connecting part 73 is closer to the lower insulating member 3, saving internal space of the battery.

[0060] Optional, refer to Figure 5 , Figure 6 The engaging structure 74 is a groove, which is used to engage and connect with the pole post 1.

[0061] In one specific embodiment, the groove is located at the edge of the mounting hole 71, and the groove engages with the end of the sidewall 12 or with the pressing part 14. Compared to the groove, the electrical connection part 73 of the electrical connection piece 7 is closer to the lower insulator 3, saving internal space of the cell, providing more space for the electrolyte, and improving the volumetric energy density and gravimetric energy density of the battery.

[0062] Furthermore, the connecting portion 72 protrudes away from the pole post 1 to form a groove, meaning the entire connecting portion 72 protrudes away from the pole post 1 to form a groove. Alternatively, the connecting portion 72 is recessed away from the pole post 1 to form a groove, meaning the side of the connecting portion 72 closest to the pole post 1 is recessed away from the pole post 1 to form a groove, and the depth of the groove is less than the thickness of the connecting portion 72. By having the connecting portion 72 protrude away from the pole post 1 to form a groove, or by having the connecting portion 72 recessed away from the pole post 1 to form a groove, there is no need to separately weld the grooved components, reducing assembly steps.

[0063] In some alternative embodiments, refer to Figure 7 , Figure 8 The electrical connector 7 has a hollow protrusion 75 extending toward the pole post 1 at the edge of the mounting hole 71, and the hollow protrusion 75 is engaged in the cavity 13 of the pole post 1.

[0064] Understandably, the electrical connector 7 is provided with a hollow protrusion 75, which engages with the cavity 13 of the electrode post 1. The hollow protrusion 75 extends into the electrode post 1, increasing the contact area and improving power transmission efficiency while reducing power loss. In this embodiment, the hollow protrusion 75 can be welded to the electrode post 1 to avoid damage to the lower insulation component 3 and the sealing ring 2 from the heat of welding.

[0065] In one specific embodiment, the electrical connector 7 further includes a connecting portion 72 and an electrical connecting portion 73. The connecting portion 72 is disposed around the hollow protrusion 75, and the electrical connecting portion 73 is connected to the connecting portion 72. The electrical connecting portion 73 is used for welding to the electrode tab.

[0066] Reference Figure 8 The end of the connecting part 72 is bent towards the lower insulating member 3 away from the hollow protrusion 75, so that the electrical connecting part 73 is closer to the lower insulating member 3, saving internal space of the battery.

[0067] Reference Figure 9 The connecting part 72 is provided with an electrical receiving groove 721, which is used to receive the end of the electrode post 1. Compared with the electrical receiving groove 721, the electrical connecting part 73 of the electrical connecting piece 7 is closer to the lower insulating member 3, saving internal space of the cell, providing more space for electrolyte, and improving the volumetric energy density and gravimetric energy density of the battery.

[0068] In some alternative embodiments, refer to Figure 8 The thickness of the electrical connection portion 73 is less than or equal to the thickness of the connection portion 72.

[0069] Preferably, the thickness of the electrical connection portion 73 is less than the thickness 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 space of the battery, and increases the capacity of a single battery cell.

[0070] In one specific embodiment, after the connecting piece is stamped, the electrical connection portion 73 intersects with the connecting portion 72. When the pole post 1 and the connecting piece are connected by welding, the area of ​​the sealing element 22 is avoided during welding, so that the welding heat will not affect the sealing element 22. After welding, the electrode tab is welded to the electrical connection portion 73. The electrode tab can be welded to the side of the electrical connection portion 73 close to the pole post 1 or to the side of the electrical connection portion 73 away from the pole post 1. After the electrode tab is welded, it is folded and flattened so that the electrical connection portion 73 is flat with the connecting portion 72, thereby reducing the space occupied by the electrical connection portion 73.

[0071] In one specific embodiment, reference is made to Figure 10 The lower insulating component 3 has a fastening engagement structure 31 on the side opposite to the top cover plate 4. The electrical connection portion 73 of the electrical connection piece 7 engages with the fastening engagement structure 31. The fastening engagement structure 31 includes an engagement hook. After the electrical connection portion 73 is welded to the electrode tab and then folded flat, it engages with the engagement hook. The engagement hook limits the electrical connection portion 73, preventing the electrical connection piece 7 from loosening and deforming when pressing the electrode post 1, and preventing the connection piece from jumping after being folded flat, which would affect the battery overcurrent during battery operation.

[0072] In another specific embodiment, refer to Figure 11 The lower insulating member 3 has a fastening engagement structure 31 on the side opposite to the top cover plate 4, which forms an engagement cavity. The electrical connection portion 73 has a fastening engagement protrusion 731 on the side near the lower insulating member 3, which engages with the engagement cavity. Furthermore, the width of the engagement cavity on the side near the electrical connection portion 73 is smaller than the width on the side opposite to the electrical connection portion 73, to prevent the fastening engagement protrusion 731 from dislodging from the engagement cavity. After the electrical connection portion 73 of the connecting piece is flattened, the fastening engagement protrusion 731 engages with the engagement cavity of the lower insulating member 3, preventing the connecting piece from jumping and avoiding overcurrent in the battery during battery operation.

[0073] Furthermore, referring to Figure 9 The electrical connection part 73 is also provided with a hollow area 732, and the electrode tab (not shown in the figure) passes through the hollow area 732 and is connected to the side of the electrical connection part 73 near the electrode post 1.

[0074] It should be noted that the tab can be welded to the side of the electrical connection portion 73 near the terminal post 1 or to the side of the electrical connection portion 73 away from the terminal post 1. When the tab is welded to the side of the electrical connection portion 73 away from the terminal post 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 that avoids the thickness of the tab, so it will not affect the battery overcurrent.

[0075] When the tab passes through the hollow area 732 of the electrical connection part 73, the tab is welded to the side of the electrical connection part 73 near the pole post 1. The gap between the electrical connection part 73 and the lower insulating member 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 member 3.

[0076] In some alternative embodiments, refer to Figure 2 The top wall 11 is provided with a buffer part 15 near the end of the side wall 12. The buffer part 15 is used to buffer the deformation of the side wall 1.

[0077] In this embodiment, when the pole post 1 is installed, the mounting base extends into the cavity 13, and the mounting fixture presses against the upper surface of the top wall 11 to press the pole post 1. The top wall 11 is provided with a buffer part 15 to provide buffer during pressing, so as to avoid the pressure of pressing causing the side wall 12 to deform and ensure the stability of the pole post 1 structure. In this way, the side wall 12 and the top wall 11 of the pole post 1 can be made thinner, further reducing the thickness of the top cover assembly.

[0078] Furthermore, the thickness of the buffer portion 15 is less than the thickness of the top wall 11. Specifically, the buffer portion 15 is formed by subtracting material from the top wall 11 along the thickness direction. The buffer portion 15 is formed by subtracting material from the top and bottom surfaces of the top wall 11 along the thickness direction. A buffer groove is formed between the buffer portion 15 and the top wall 11 to disperse pressure and prevent deformation of the side wall 12 during pressing.

[0079] In some alternative embodiments, the pole 1 is interference-fitted with the conductive element 5.

[0080] In this embodiment, the top cover assembly is riveted, so any gap between the conductive component 5 and the terminal post 1 during installation cannot be eliminated. Therefore, the terminal post 1 and the conductive component 5 are designed with an interference fit, and the conductive component 5 and the terminal post 1 are assembled using a crimping fixture to ensure there is no gap between them, thus avoiding affecting conductivity. In this embodiment, the interference fit mainly refers to the interface where the terminal post 1 and the conductive component 5 are connected.

[0081] In one specific embodiment, reference is made to Figure 2 The end of the pole post 1 near the top wall 11 is also provided with a snap-fit ​​part 17 protruding towards the conductive element 5, and the snap-fit ​​part 17 is engaged with the conductive element 5.

[0082] Furthermore, the snap-fit ​​part 17 has a flanged structure. The snap-fit ​​part 17 is integrally formed with the pole post 1, reducing the welding steps.

[0083] In this embodiment, the conductive element 5 is engaged with the snap-fit ​​part 17. Therefore, even if there is a dimensional error between the conductive element 5 and the pole post 1, there is still a connection surface between the conductive element 5 and the pole post 1, which will not cause gaps during welding that affect conductivity.

[0084] In one specific embodiment, the sidewall 12 is an inclined sidewall 12 (not shown in the figure), and the end dimension of the inclined sidewall 12 near the top wall 11 is smaller than the end dimension of the inclined sidewall 12 near the electrical connection piece 7; the inner wall of the conductive member 5 is an inclined inner wall, and the end dimension of the inclined inner wall near the electrical connection piece 7 is smaller than the end dimension of the inclined inner wall away from the electrical connection piece 7; the inclined sidewall 12 abuts against the inclined inner wall.

[0085] In this embodiment, the sidewalls 12 of the conductive element 5 and the pole post 1 are respectively inclined. Therefore, even if there is a dimensional error between the conductive element 5 and the pole post 1, there is still a connection surface between the conductive element 5 and the pole post 1, which will not cause gaps during welding that affect conductivity.

[0086] In one specific embodiment, reference is made to Figure 7 The end of the conductive element 5 that is connected to the side wall 12 is provided with an extension 51. The extension 51 is located between the top cover plate 4 and the side wall 12, and the extension 51 abuts against the side wall 12.

[0087] In this embodiment, the extension 51 increases the contact area with the pole post 1, thereby improving conductivity.

[0088] In some alternative embodiments, refer to Figure 2 The top wall 11 of the pole post 1 is also provided with a positioning part 111, which is located at the center of the top wall 11.

[0089] Specifically, the positioning part 111 is a groove, and the pressing tool engages with the positioning part 111 for positioning. Further, the groove is formed by the top wall 11 recessing into the cavity 13.

[0090] In another specific embodiment, refer to Figure 2 The top wall 11, on the side near the cavity 13, is also provided with a positioning protrusion 16 protruding into the cavity 13. During assembly of the hollow pole 1, when the electrical connector 7 has a mounting hole 71, the mounting fixture base extends into the cavity 13 of the pole 1 through the mounting hole 71. The positioning protrusion 16 engages with the mounting fixture base, thereby positioning the hollow pole 1 and preventing misalignment during pressing. When the electrical connector 7 has a hollow protrusion 75, the hollow protrusion 75 engages with the positioning protrusion 16 for positioning.

[0091] This utility model also provides a battery, including a top cover assembly of any one of the above embodiments.

[0092] The method for preparing the top cover assembly provided by this utility model includes the following steps:

[0093] (1) Provide a combination of pole post 1 and electrical connector 7. The pole post 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 form a cavity 13. The electrical connector 7 is provided with a mounting hole 71.

[0094] (2) Place the assembly on the mounting base so that the mounting base extends from the mounting hole 71 into the cavity 13.

[0095] (3) Sequentially install the sealing element 2, the lower insulating element 3, the top cover plate 4, the upper insulating element 6 and the conductive element 5 on the pole post 1, and then press the conductive element 5 and the top of the pole post 1 together.

[0096] (4) Weld pole 1 and conductive component 5.

[0097] In this embodiment, the top cover assembly does not require riveting; it only presses the conductive part 5 and the upper surface of the pole post 1 together. During pressing, it will not cause significant deformation of the side wall 12 of the pole post 1 or the electrical connection piece 7.

[0098] In this embodiment, the combination of pole post 1 and electrical connection piece 7 can be integrally formed or separately formed.

[0099] In one specific embodiment, when the composite component is formed in separate parts, after welding the pole and conductive parts, the electrical connection piece 7 is assembled with the pole 1 and welded together.

[0100] In another specific embodiment, when the composite components are molded separately, the method for preparing the top cover assembly includes the following processes:

[0101] (1) Provide a combination component of pole post 1 and electrical connector 7 to engage pole post 1 and electrical connector 7. Pole post 1 includes top wall 11 and side wall 12. Side wall 12 is connected to top wall 11. Side wall 12 and top wall 11 form cavity 13. Electrical connector 7 is provided with mounting hole 71.

[0102] (2) Place the assembly on the mounting base so that the mounting base extends from the mounting hole 71 into the cavity 13.

[0103] (3) Separately install the sealing element 2, the lower insulating element 3, the top cover plate 4, the upper insulating element 6 and the conductive element 5 on the pole post 1. The lower insulating element 3 has a fastening and locking structure 31 on the side away from the top cover plate 4. The electrical connecting piece 7 is locked with the fastening and locking structure 31, and then the conductive element 5 and the top of the pole post 1 are pressed together.

[0104] (4) Weld pole 1 and conductive component 5.

[0105] (5) Weld the electrical connection piece 7 to the pole 1.

[0106] In this embodiment, the electrical connecting piece 7 is engaged with the fastening and locking structure 31. When the mounting base only extends into the cavity 13 and does not contact other components, the electrical connecting piece 7 and the lower insulating member 3 are engaged by the fastening and locking structure 31 to prevent the electrical connecting piece 7 from moving and improve the structural stability.

[0107] The embodiments described above are merely illustrative of several implementations of this utility model, and 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 those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A top cover assembly, characterized in that, include: An electrode post, the electrode post comprising a connected top wall and a side wall, the side wall and the top wall forming a cavity; A sealing element, wherein the sealing element is sleeved outside the side wall; Lower insulation component; A top cover sheet, the inner surface of which abuts against the lower insulating member, the pole penetrating the lower insulating member and the top cover sheet, and the sealing member located between the top cover sheet and the side wall; A conductive element is disposed on the outside of the top cover plate and sleeved on the outside of the side wall; An upper insulating member is disposed between the conductive member and the top cover plate; An electrical connector is disposed on the side of the lower insulator opposite to the top cover plate. The electrical connector is electrically connected to the pole. The electrical connector has a mounting hole through which it can extend into the cavity.

2. The top cover assembly according to claim 1, characterized in that, The conductive element has a bent portion at the end connected to the side wall, the bent portion being located between the top cover and the side wall, and the bent portion abutting against the side wall.

3. The top cover assembly according to claim 1, characterized in that, The electrode post is interference-fitted with the conductive component.

4. The top cover assembly according to claim 1, characterized in that, The end of the pole near the top wall is also provided with a snap-fit ​​part that protrudes toward the conductive element, and the snap-fit ​​part is engaged with the conductive element.

5. The top cover assembly according to claim 1, characterized in that, The sidewall is an inclined sidewall, and the dimension of the end of the inclined sidewall near the top wall is smaller than the dimension of the end of the inclined sidewall near the electrical connection piece; The inner wall of the conductive component is an inclined inner wall, and the dimension of the end of the inclined inner wall near 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 sidewall abuts against the inclined inner wall.

6. The top cover assembly according to any one of claims 1 to 5, characterized in that, The top wall has a buffer section at the end near the side wall.

7. The top cover assembly according to claim 6, characterized in that, The pole also includes a pressing part, which is connected to the end of the side wall opposite to the top wall. The pressing part is located on the side of the lower insulating member opposite to the top cover plate and is located directly below the sealing member.

8. The top cover assembly according to claim 7, characterized in that, The thickness of the pressing part is greater than or equal to the thickness of the sidewall; And / or, the thickness of the sidewall is greater than or equal to the thickness of the top wall.

9. The top cover assembly according to claim 1, characterized in that, The lower insulating component is provided with a fastening engagement structure, which engages with the electrical connecting piece.

10. A battery, characterized in that, Includes the top cover assembly as described in any one of claims 1 to 9.

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