Battery cover plate assembly and preparation method thereof, battery monomer and electric equipment

Abstract

The invention discloses a battery cover plate assembly and a preparation method thereof, a battery monomer and electric equipment, and relates to the technical field of batteries. The cover plate assembly comprises a cover plate, a leading-out piece and a sealing piece, the two opposite side surfaces of the cover plate are the plate front face and the plate back face respectively, and a through hole is formed in the cover plate; the lead-out piece is arranged in the through hole and used for conducting current, the lead-out piece is provided with an outer lead-out surface and an inner lead-out surface which are opposite to each other, and a lead-out peripheral surface connected between the outer lead-out surface and the inner lead-out surface, and the outer lead-out surface and the plate front surface are located on the same side; the sealing piece is at least partially arranged between the hole wall of the through hole and the leading-out peripheral surface; one of the hole wall of the through hole and the leading-out peripheral surface is provided with a bulge, the other one is provided with a groove, the bulge is embedded in the groove, and at least part of the sealing element is extruded between the bulge and the inner wall of the groove. The battery cover plate assembly provided by the embodiment of the invention is good in sealing and insulating properties, simple in sealing structure and few in parts, and meanwhile, the overall height is prevented from being increased.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to a battery cover assembly and its preparation method, a battery cell, and an electrical device. Background Technology

[0002] In some existing battery cover assemblies, the terminals and current lead-out components often employ riveting or ceramic assembly structures, requiring multiple insulating seals to achieve sealing and conductivity functions, resulting in complex structures and cumbersome assembly. Although some existing technologies simplify the structure through integrated design, the sealing surface is positioned along the height of the cover assembly, which to some extent limits the reduction of the overall height of the battery cover.

[0003] Therefore, how to achieve a reliable seal while reducing the number of parts and avoiding increasing the overall height has become one of the problems that current battery cover plates need to solve. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the first aspect of the present invention aims to provide a battery cover assembly with good sealing and insulation properties, a simple sealing structure with few parts, and at the same time, avoids increasing the overall height.

[0005] The second aspect of the present invention is to provide a battery cell having the above-described battery cover assembly.

[0006] The third aspect of the present invention aims to provide a battery assembly having the above-mentioned battery cells.

[0007] The fourth aspect of the present invention is to provide a battery pack having the above-described battery components.

[0008] The fifth aspect of this invention aims to provide an electrical device having the aforementioned battery pack.

[0009] The sixth aspect of this invention aims to provide a method for preparing the above-mentioned battery cover assembly.

[0010] According to a first aspect of the present invention, a battery cover assembly includes: a cover plate, a lead-out member, and a sealing member. The cover plate has two opposing surfaces, a front surface and a back surface, respectively. A through hole extends from the front surface to the back surface of the cover plate. The lead-out member is disposed within the through hole and is used to conduct current. The lead-out member has an opposing outer lead-out surface and an inner lead-out surface, and a lead-out peripheral surface connecting the outer lead-out surface and the inner lead-out surface. The outer lead-out surface and the front surface of the cover plate are located on the same side. The sealing member is at least partially disposed between the wall of the through hole and the lead-out peripheral surface to achieve an insulating seal between the cover plate and the lead-out member. One of the wall of the through hole and the lead-out peripheral surface has a protrusion, and the other has a groove. The protrusion is embedded in the groove, and at least a portion of the sealing member is pressed between the protrusion and the inner wall of the groove.

[0011] According to embodiments of the present invention, a battery cover assembly achieves a stable connection between the lead-out member and the cover plate by providing a mutually cooperating protrusion and groove structure between the lead-out member and the through hole of the cover plate, and by pressing the sealing member at least partially into the protrusion and groove. Furthermore, the pressure deformation of the sealing member forms a reliable sealing insulation. In this application, the sealing member is arranged radially in the through hole, which avoids the height increase caused by stacking in some traditional sealing structures, thus saving installation space and preventing an increase in the overall height of the cover assembly, resulting in a more compact structure.

[0012] According to some optional embodiments of the present invention, the lead-out peripheral surface is provided with the protrusion; in the thickness direction of the battery cover assembly, at least one of the outer lead-out surface and the inner lead-out surface is located between the front side of the plate and the back side of the plate, so that the battery cover assembly forms a recess at at least one location on the outer lead-out surface and the inner lead-out surface.

[0013] In some further embodiments, the wall of the through hole is provided with the protrusion; in the thickness direction of the battery cover assembly, at least one of the front side and the back side of the plate is located between the outer lead-out surface and the inner lead-out surface, so that the battery cover assembly forms a boss at at least one of the outer lead-out surface and the inner lead-out surface.

[0014] Further optionally, the lead-out peripheral surface is provided with the protrusion, and the lead-out part is an integrally stamped part; or, the hole wall of the through hole is provided with the protrusion, and the cover plate is an integrally stamped part.

[0015] Specifically, the groove is provided on the peripheral surface of the lead-out, and the lead-out component is formed by connecting two metal sheets through vacuum diffusion welding; or, the groove is provided on the wall of the through hole, and the cover plate is formed by connecting two metal sheets through vacuum diffusion welding.

[0016] Optionally, the battery cover assembly forms the boss at the outer lead-out surface; a portion of the seal forms a connecting insulating sheet, which is located on one side of the front side of the cover.

[0017] In some alternative embodiments, the connecting insulating sheet has an angle with the front side of the plate, and the connecting insulating sheet is inclined away from the lead-out member.

[0018] Alternatively, the sealing element includes a sealing ring located between the wall of the through hole and the lead-out peripheral surface, the sealing ring being disposed around the lead-out element.

[0019] According to some alternative embodiments of the battery cover assembly of the present invention, the seal further includes: a sealing cover, the sealing cover being in contact with the back of the plate, and the inner edge of the sealing cover being connected to the sealing ring.

[0020] Furthermore, the back of the plate is provided with a slot, and the sealing element also includes a protrusion, which is connected to the sealing cover and is embedded in the slot.

[0021] Further optionally, the seal further includes: a tab septum, the tab septum being located on one side of the back side of the cover plate, one end of the tab septum being connected to the sealing ring.

[0022] Specifically, the tab septum consists of multiple pieces arranged circumferentially along the lead-out member, with a break seam between adjacent tab septum pieces.

[0023] A battery cell according to a second aspect of the present invention includes: a housing, a battery cell, and a battery cover assembly according to a first aspect of the present invention, wherein the housing has a receiving cavity with an opening; the battery cell is disposed in the receiving cavity, and the battery cell includes a tab; the battery cover assembly is disposed at the opening, the cover is connected to the housing, and the inner lead-out surface of the lead-out member is connected to the tab.

[0024] A battery assembly according to a third aspect of the present invention includes: at least two battery cells as described in a second aspect of the present invention and a connecting piece, the connecting piece being connected to the external lead-out surfaces of the at least two battery cells.

[0025] Furthermore, the battery cover assembly forms a recess at the outer lead-out surface; the battery assembly also includes: an insulating sheet disposed on the front side of the plate, one end of the insulating sheet being bent and placed in the recess and connected to the sealing element; a portion of the connecting piece is in surface contact with the outer lead-out surface, and a portion of the connecting piece is in surface contact with the insulating sheet.

[0026] Alternatively, a portion of the seal forms a connecting insulating sheet that is in close contact with the front side of the plate, the outer lead-out surface is flush with the surface of the connecting insulating sheet, a portion of the connecting sheet is in surface contact with the outer lead-out surface, and a portion of the connecting sheet is in contact with the connecting insulating sheet.

[0027] A battery pack according to a fourth aspect of the present invention includes the battery assembly described in the third aspect of the present invention.

[0028] An electrical device according to a fifth aspect of the present invention includes a battery pack according to a fourth aspect of the present invention.

[0029] A method for preparing the battery cover assembly described above, according to an embodiment of a sixth aspect of the present invention. This method is used to manufacture the battery cover assembly described in the first aspect of the present invention, and the method includes:

[0030] S1: Prepare the lead-out element, the sealing element, and the cover plate with the through hole; place at least a portion of the sealing element in the through hole; place the lead-out element in the through hole and surround it with the sealing element.

[0031] The lead-out component has an outer surface and an inner surface facing away from each other. The outer surface and the front surface of the plate are located on the same side. One of the outer surface and the inner surface is provided with a stretching table, and the other surface is provided with a stretching groove corresponding to the stretching table.

[0032] Furthermore, one of the through hole wall and the outer peripheral surface of the lead-out component is provided with the protrusion, and the other is provided with the groove;

[0033] S2: Press at least one of the outer original surface and the inner original surface to extend the lead-out element, and both the outer original surface and the inner original surface unfold into a plane. The lead-out element unfolds into the lead-out element, and after extension, the protrusion is embedded in the groove. At least a portion of the sealing element is squeezed between the protrusion and the inner wall of the groove, and the sealing element is squeezed into the sealing element.

[0034] In some optional embodiments, the compression of the sealing element to the seal in step S2 is between 25% and 50%.

[0035] Further optionally, in step S1, the lead-out element has a metal flow control recess at the edge on at least one of the outer surface and the inner surface.

[0036] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. Attached Figure Description

[0037] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0038] Figure 1 This is a cross-sectional view of the battery cover assembly in some embodiments of the present invention;

[0039] Figure 2 This is a schematic diagram illustrating the fit between the tab septum and the seal in some embodiments of the present invention;

[0040] Figure 3 This is a schematic diagram illustrating the cooperation between the connecting piece and the insulating piece in some embodiments of the present invention;

[0041] Figure 4 This is a perspective view of the battery cover assembly (with a recessed structure) in some embodiments of the present invention;

[0042] Figure 5 This is a schematic diagram showing the position of the tab septum on the cover plate in some embodiments of the present invention;

[0043] Figure 6 This is a perspective view of the battery cover assembly (with a boss structure) in some embodiments of the present invention;

[0044] Figure 7 This is a side view of the battery cover assembly in some embodiments of the present invention;

[0045] Figure 8 for Figure 7 Sectional view at point AA;

[0046] Figure 9 This is a schematic diagram showing the position of the connecting insulating sheet in some embodiments of the present invention;

[0047] Figure 10 This is a schematic diagram illustrating the cooperation between the connecting piece and the connecting insulating piece in some embodiments of the present invention;

[0048] Figure 11 This is a schematic diagram of the back structure of the cover plate in some embodiments of the present invention;

[0049] Figure 12 This is a schematic diagram of the cover plate structure in some embodiments of the present invention;

[0050] Figure 13 This is a schematic diagram of the structure of the lead-out component in some embodiments of the present invention;

[0051] Figure 14 This is a schematic diagram of the sealing element in some embodiments of the present invention;

[0052] Figure 15This is a perspective view of the components shown in some embodiments of the present invention;

[0053] Figure 16 The present invention illustrates the form of the original component and the cover plate after assembly and before molding in some embodiments;

[0054] Figure 17 The following are side views of the original component and cover plate after assembly and before molding in some embodiments of the present invention;

[0055] Figure 18 for Figure 7 Sectional view at point BB;

[0056] Figure 19 This is a cross-sectional view of the original component and cover plate after assembly and before forming in some embodiments of the present invention;

[0057] Figure 20 for Figure 15 A magnified view of a portion of point C.

[0058] Figure label:

[0059] Battery cover assembly 100

[0060] Cover plate 10, front side of plate 11, back side of plate 12, slot 121, through hole 13

[0061] Lead-out component 30, outer lead-out surface 32, inner lead-out surface 34, lead-out peripheral surface 36, recess 371, boss 372.

[0062] 41. Protrusion 42.

[0063] 50. Seal Component 50; 51. Seal Ring 51; 52. Seal Cover 52; 53. Clamping Protrusion 53; 54. Electrode Lug 54; 541. Disconnection Slot 54; 55. Connecting Insulating Sheet

[0064] Lead-out element 30', outer surface 32', inner surface 34', extension table 373', extension groove 374', metal flow control recess 375',

[0065] 50' sealing element

[0066] Connecting piece 200

[0067] Insulating sheet 300. Detailed Implementation

[0068] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0069] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "top," "bottom," "inner," "outer," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0070] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0071] The following is for reference. Figures 1-11 A battery cover assembly 100 according to a first aspect of the present invention is described.

[0072] like Figure 1 As shown, the battery cover assembly 100 according to an embodiment of the present invention includes: a cover 10, an extension member 30, and a sealing member 50.

[0073] The cover plate 10 serves as the basic structure of the entire assembly, providing physical protection for the internal environment of the battery. The cover plate 10 also supports the installation and fixation of the lead-out member 30 and the seal member 50.

[0074] Lead-out member 30 is connected to cover plate 10. When the battery is discharging, lead-out member 30 is used to conduct the current inside the battery to an external circuit. In some optional embodiments, when the battery is charging, lead-out member 30 is used to conduct external current into the battery. Further optionally, lead-out member 30 is a metal block, preferably an aluminum block.

[0075] The sealing element 50 is located between the lead-out element 30 and the cover plate 10, and is used to achieve insulation isolation between the two and seal the gap between the lead-out element 30 and the cover plate 10.

[0076] The opposite sides of the cover plate 10 are the front side 11 and the back side 12, respectively. The cover plate 10 has a through hole 13 that runs from the front side 11 to the back side 12. The lead-out member 30 is disposed in the through hole 13 and is used to conduct current.

[0077] By placing the lead-out member 30 in the through hole 13 of the cover plate 10, the lead-out member 30 can be stably installed on the cover plate 10.

[0078] The lead-out part 30 is fitted with an interference fit or a snap fit in the through hole 13 of the cover plate 10, and is fixed by the tight contact between it and the cover plate 10. Moreover, the interference fit can achieve stable installation of the lead-out part 30 without the need for additional fasteners, while ensuring good electrical connection performance and mechanical strength between it and the cover plate 10. This reduces the number of parts, simplifies the assembly process, and reduces manufacturing costs.

[0079] The lead-out member 30 has an outer lead-out surface 32 and an inner lead-out surface 34 facing away from each other, and a lead-out peripheral surface 36 connecting the outer lead-out surface 32 and the inner lead-out surface 34. The outer lead-out surface 32 and the front surface 11 of the plate are located on the same side.

[0080] Here, the outer lead-out surface 32 faces outwards from the battery, facilitating connection to external circuits such as the connecting piece 200 and wiring harnesses, while the inner lead-out surface 34 faces inwards from the battery, facilitating connection to battery tabs or other internal conductive structures. The lead-out peripheral surface 36 connects the inner and outer lead-out surfaces, forming the side profile of the lead-out member 30 and providing structural support for the inner lead-out surface 34 and the outer lead-out surface 32. The lead-out peripheral surface 36 also enables electrical connection between the inner lead-out surface 34 and the outer lead-out surface 32, thereby shortening the current transmission path, reducing contact resistance, and improving overcurrent capacity.

[0081] The seal 50 is at least partially disposed between the wall of the through hole 13 and the lead-out peripheral surface 36 to achieve an insulating seal between the cover plate 10 and the lead-out member 30. The seal 50 can prevent short circuits between the cover plate 10 and the lead-out member 30, and at the same time prevent electrolyte leakage, thereby improving battery safety.

[0082] By placing the seal 50 between the hole wall of the through hole 13 and the lead-out peripheral surface 36, there is no need to set up an additional vertical sealing layer or support structure, reducing assembly complexity. Moreover, in this application, the seal 50 is arranged radially in the through hole 13, which can avoid the height increase caused by the stacking arrangement in some traditional sealing structures, thus saving installation space and avoiding an increase in the overall height of the cover plate assembly, making the structure more compact.

[0083] In this case, one of the through hole 13 and the lead-out peripheral surface 36 is provided with a protrusion 41, and the other is provided with a groove 42. The protrusion 41 is embedded in the groove 42, and at least a portion of the seal 50 is pressed between the inner wall of the protrusion 41 and the groove 42.

[0084] This structure achieves an insulating and sealing effect by setting mutually cooperating protrusions 41 and grooves 42 between the through hole 13 wall and the lead-out peripheral surface 36, and by pressing at least a portion of the seal 50 between the two, thereby lifting the seal 50 between the two through partial compression.

[0085] During assembly, the engagement of protrusion 41 and groove 42 not only guides and limits the assembly process, improving assembly efficiency, but also reduces problems such as poor sealing caused by positioning deviations. Furthermore, this snap-fit ​​structure reduces the need for additional connectors or supports, further simplifying the overall structure and lowering manufacturing costs.

[0086] According to some optional embodiments of the present invention, such as Figure 1-Figure 5 As shown, the peripheral surface 36 is provided with a protrusion 41. In the thickness direction of the battery cover assembly 100, at least one of the outer lead-out surface 32 and the inner lead-out surface 34 is located between the front side 11 and the back side 12 of the plate, so that the battery cover assembly 100 forms a recess 371 at at least one location on the outer lead-out surface 32 and the inner lead-out surface 34.

[0087] In the above technical solution, the lead-out peripheral surface 36 is provided with a protrusion 41, and the hole wall of the through hole 13 is provided with a groove 42 that engages with the protrusion 41 to achieve a stable engagement between the lead-out member 30 and the cover plate 10. The engagement of the protrusion 41 and the groove 42 not only enhances the assembly stability of the lead-out member 30 on the cover plate 10, but also provides a local compression space for the sealing member 50, thereby further improving the reliability of the insulation seal.

[0088] Furthermore, a recess 371 is formed on at least one of the outer lead-out surface 32 and the inner lead-out surface 34, forming a deformable area. During the process of pressing the lead-out member 30 into the through hole 13 of the cover plate 10, the recessed area 371 undergoes plastic deformation outward under the action of external force, and the lead-out peripheral surface 36 extends in all directions, thereby cooperating with the groove 42 on the hole wall of the through hole 13 and compressing the sealing member 50, thereby achieving a sealing and insulating fit between the lead-out member 30 and the cover plate 10.

[0089] In addition, after the lead-out component 30 is assembled, one of the outer lead-out surface 32 and the inner lead-out surface 34 with the recessed structure 371 is lower than the front side 11 or back side 12 of the cover plate 10. This reduces the space occupied by the lead-out component 30 in the thickness direction, which helps to reduce the overall height of the cover plate assembly. Moreover, the recessed structure 371 can also serve as a connection between the internal and external circuits and the cover plate, allowing the external connecting piece 200 or the internal electrode to be embedded in the recessed structure 371 and achieve a stable electrical connection with the corresponding lead-out surface. At the same time, the recessed structure 371 also reduces the overall height of the lead-out component 30, shortens the current path, reduces contact resistance, and thus improves the overcurrent capacity of the battery cover plate assembly 100.

[0090] In some further embodiments, combined with Figures 6-10 The wall of the through hole 13 is provided with a protrusion 41. In the thickness direction of the battery cover assembly 100, at least one of the front surface 11 and the back surface 12 is located between the outer lead-out surface 32 and the inner lead-out surface 34, so that the battery cover assembly 100 forms a boss 372 at at least one location on the outer lead-out surface 32 and the inner lead-out surface 34.

[0091] In the above technical solution, the wall of the through hole 13 is provided with a protrusion 41, and the lead-out peripheral surface 36 is provided with a groove 42 that engages with the protrusion 41 to achieve a stable engagement between the lead-out part 30 and the cover plate 10. The engagement of the protrusion 41 and the groove 42 not only enhances the assembly stability of the lead-out part 30 on the cover plate 10, but also provides a local compression space for the sealing part 50, thereby further improving the reliability of the insulation seal.

[0092] Furthermore, at least one boss 372 is provided on the outer lead-out surface 32 and the inner lead-out surface 34, and this boss 372 is a deformable area. During the process of press-fitting the lead-out member 30 into the through hole 13, the boss 372 undergoes plastic deformation under pressure. After the groove 42 of the lead-out peripheral surface 36 is successfully assembled with the corresponding protrusion 41, the boss 372 remains in a deformed state to prevent the lead-out member 30 from loosening or falling off, and to ensure the fixed connection between the lead-out member 30 and the cover plate 10.

[0093] In some technical solutions, a boss 372 is formed on the outer lead-out surface 32, and a recess 371 is formed on the inner lead-out surface 34. During the assembly process, as the lead-out part 30 is pressed into the through hole 13, external pressure acts on both sides of the lead-out part 30, causing the boss 372 and the recess 371 to be stressed and undergo plastic deformation simultaneously, so that a snap-fit ​​fit is formed between the lead-out peripheral surface 36 and the hole wall of the through hole 13, thereby achieving structural fixation.

[0094] Alternatively, the lead-out peripheral surface 36 is provided with a protrusion 41, and the lead-out part 30 is an integrally stamped part; or, the hole wall of the through hole 13 is provided with a protrusion 41, and the cover plate 10 is an integrally stamped part.

[0095] In some technical solutions, the lead-out component 30 is a one-piece stamped part. Optionally, the lead-out component 30 is a one-piece molded metal block. The one-piece molded metal block has no connecting gaps, avoiding potential risks at the connection points and making the overall structure of the lead-out component 30 more robust. Moreover, since the one-piece molded metal block has no welding points or mechanical connection points, it avoids the resistance increase that may occur at connection points, thereby ensuring its stable current carrying capacity.

[0096] In some other technical solutions, the cover plate 10 is a one-piece stamped part. This method results in high consistency and good dimensional accuracy of the cover plate 10, which helps improve product consistency, facilitates mass production, and reduces production costs. Furthermore, the one-piece stamped cover plate 10 avoids welding or assembly processes, reduces the number of parts and assembly steps, reduces unnecessary connection points, further reduces potential failure points, and improves the stability and reliability of the cover plate 10.

[0097] Specifically, the lead-out peripheral surface 36 is provided with a groove 42, and the lead-out component 30 is formed by connecting two metal sheets through vacuum diffusion welding. Optionally, during the manufacturing process, the groove 42 structure is first machined on one of the metal sheets, and then vacuum diffusion welded to the other metal sheet. By welding two metal sheets to form the lead-out component 30, the amount of material used can be reduced, which is beneficial for both cost reduction and achieving the goal of lightweighting.

[0098] Alternatively, the wall of the through hole 13 may have a groove 42, and the cover plate 10 may be formed by connecting two metal sheets through vacuum diffusion welding. Optionally, one of the metal sheets may have a groove 42 pre-machined on it and then vacuum diffusion welded to the other metal sheet. After welding, the groove 42 is located at the wall of the through hole 13 and is used to engage with the protrusion 41 on the lead-out member 30, thereby forming a structurally stable cover plate 10. The cover plate 10 is made of welded metal sheets, which helps to reduce material costs and also contributes to achieving the goal of lightweighting.

[0099] Optionally, the cover plate 10 may also include carbon fiber components, ceramic components, etc. It can also be welded together by methods such as brazing.

[0100] Specifically, such as Figures 9-10 As shown, the battery cover assembly 100 has a boss 372 formed at the outer lead-out surface 32. A portion of the seal 50 forms a connecting insulating sheet 55, which is located on one side of the front surface 11 of the cover 10.

[0101] In the above technical solution, the boss 372 is used to provide assembly positioning and structural support for the external connecting piece 200, ensuring that the external connecting piece 200 is accurately attached and fixed in the preset position.

[0102] When the external connecting piece 200 establishes an electrical connection with the lead-out piece 30, the connecting insulating piece 55 is disposed on the surface of the boss 372 and located between the external connecting piece 200 and the cover plate 10 to isolate the electrical path between the two, prevent accidental conduction, and improve the safety and reliability of the battery system.

[0103] In some alternative embodiments, refer to Figure 9 The connecting insulating sheet 55 has an angle with the front side of the plate 11, and the connecting insulating sheet 55 is inclined in a direction away from the lead-out member 30.

[0104] It is worth noting that during the manufacturing process of the battery cover assembly 100, the cover 10 typically needs to be welded to the battery casing, for example, by using laser welding to achieve a sealed connection. During this process, the high temperature generated by welding and the conduction of heat to the cover 10 body may cause thermal damage to the surrounding sealing components 50, especially the connecting insulating sheet 55 located near the welding area.

[0105] Therefore, an angle is formed between the connecting insulating sheet 55 and the front surface 11 of the cover plate 10, and the sheet is tilted away from the lead-out member 30. This tilted structure changes the relative position between the insulating sheet 300 and the cover plate 10, thereby avoiding the welding heat-affected zone to a certain extent and reducing the impact of heat conduction on the connecting insulating sheet 55 during welding.

[0106] In addition, the inclined connecting insulating sheet 55 can also create space avoidance to a certain extent, reducing the direct impact of welding spatter or local high temperature on its surface, and further improving the structural integrity of the connecting insulating sheet 55.

[0107] Alternatively, the seal 50 includes a sealing ring 51 located between the wall of the through hole 13 and the lead-out peripheral surface 36, the sealing ring 51 being disposed around the lead-out member 30.

[0108] Here, the sealing ring 51 is disposed in the gap between the lead-out member 30 and the cover plate 10, and is located between the hole wall of the through hole 13 of the cover plate 10 and the lead-out peripheral surface 36 of the lead-out member 30. The sealing ring 51 has a ring-shaped structure and is arranged around the outer periphery of the lead-out member 30 to form a complete insulation sealing path, forming a stable insulation sealing interface between the lead-out member 30 and the cover plate 10, while preventing electrolyte leakage and external contaminant intrusion, and ensuring the insulation sealing effect.

[0109] According to some optional embodiments of the present invention, such as the battery cover assembly 100, Figure 1-Figure 3 As shown, the seal 50 also includes a sealing cover 52, which is in contact with the back side of the plate 12, and the inner edge of the sealing cover 52 is connected to a sealing ring 51.

[0110] The sealing cover 52 is in contact with the back surface 12 of the cover plate 10, thereby forming an insulating layer on the back surface 12 of the cover plate 10 to prevent direct contact between the electrode tab and the cover plate 10, thus achieving reliable insulation between the cover plate 10 and the electrode tab.

[0111] Furthermore, the sealing cover 52 completely covers the back of the plate 10, thereby ensuring the reliability of insulation and preventing problems such as short circuits caused by accidental contact or electrical conduction.

[0112] Here, the sealing cover 52 and the back surface 12 of the plate can be connected by an insulating adhesive layer. The insulating adhesive layer can fix the sealing cover 52 to the back surface 12 of the plate, ensuring the stability of the position of the sealing cover 52, and also enhancing the electrical insulation effect between the cover plate 10 and the tab. This reduces displacement or detachment caused by external vibration and tension, thereby effectively ensuring the insulation reliability and structural stability of the battery assembly during use.

[0113] The inner edge of the sealing cap 52 is connected to the sealing ring 51. This means that the sealing cap 52 and the sealing ring 51 form a continuous insulating path to prevent accidental connection between the lead-out 30 and the cover plate 10.

[0114] Further, such as Figure 2 As shown, a slot 121 is provided on the back side 12 of the plate, and the sealing element 50 also includes a protrusion 53, which is connected to the sealing cover 52 and is embedded in the slot 121.

[0115] During assembly, the locking protrusion 53 is embedded in the locking groove 121 on the back side of the plate 12 to achieve positioning and fixed connection between the seal 50 and the cover plate 10. The engaging structure of the locking protrusion 53 and the locking groove 121 effectively improves the stability of the seal 50 during installation. Especially during the installation of the lead-out member 30, as the lead-out member 30 expands, the sealing cover 52 may be subjected to inward pulling force. At this time, the engaging engagement of the locking protrusion 53 and the locking groove 121 can prevent the sealing cover 52 from moving inward, keeping it within the preset area on the back side of the plate 12, thereby ensuring a tight fit between the sealing cover 52 and the back side of the plate 12.

[0116] In addition, during use, the cooperation between the protrusion 53 and the slot 121 can prevent the risk of relative displacement or separation between the sealing cover 52 and the cover plate 10 due to vibration or other reasons, thereby continuously maintaining the insulating isolation effect of the sealing cover 52 between the tab and the cover plate 10, and improving the safety and reliability of the battery.

[0117] Alternatively, an insulating adhesive layer may be provided between the protrusion 53 and the slot 121. This increases the tightness of the connection between the sealing cap 52 and the cover plate 10, and also forms an additional electrical insulation barrier between the protrusion 53 and the cover plate 10, further enhancing the overall insulation performance of the battery cover assembly 100.

[0118] Further optional, such as Figure 2 , Figure 5 , Figure 9 , Figure 10 and Figure 11 The sealing element 50 also includes: a tab 54, which is located on one side of the back side 12 of the cover plate 10, and one end of the tab 54 is connected to a sealing ring 51.

[0119] After the battery is assembled, the tab separator 54 provides additional isolation protection for the tabs extending from the cover plate 10, preventing direct contact between the tabs and other metal components inside the battery casing or cell, thereby avoiding safety risks caused by short circuits or abnormal conduction. By setting the tab separator 54 along the path of the tab extension, it provides additional insulation inside the cell, further enhancing the overall electrical safety of the battery.

[0120] Furthermore, the tab separator 54 is connected to the sealing ring 51 and can be installed together with the seal 50. This fixed installation improves the overall structural integrity of the seal 50, ensuring that the insulating components maintain a relatively stable positional relationship during assembly and use, and guaranteeing their continued isolation and insulation functions throughout the battery's lifespan.

[0121] Specifically, such as Figure 5 and Figure 11 As shown, the tab 54 consists of multiple pieces arranged circumferentially along the lead-out member 30, and a break slit 541 is provided between two adjacent tab 54 pieces.

[0122] The design of the split seam 541 allows the electrode tab partition 54 to be folded toward the back of the plate 12 by pressing down during the welding operation between the electrode tab and the lead-out member 30, so as to avoid the electrode tab partition 54 interfering with the welding process and make the welding operation unobstructed.

[0123] It is worth noting that during the welding process, the electrode tab 54 can be folded using a pressing mold to reduce the need for manual pressing and make the welding process smoother.

[0124] After welding is completed, the tab septum 54 can restore its original shape, achieve the intended isolation function, and provide insulation protection for the tab.

[0125] A battery cell according to a second aspect of the present invention includes: a housing, a battery cell, and a battery cover assembly 100 according to a first aspect of the present invention. The housing has an opening in a receiving cavity. The battery cell is disposed in the receiving cavity and includes tabs. The battery cover assembly 100 is disposed at the opening, and the cover 10 is connected to the housing. The inner lead-out surface 34 of the lead-out member 30 is connected to the tab.

[0126] In this embodiment, the battery cell utilizes the improved battery cover assembly 100, which not only facilitates the electrical connection between the internal and external circuits of the battery cell, but also ensures reliable insulation between the lead-out member 30 and the cover 10 through the cooperation of the sealing member 50, preventing short circuits. Simultaneously, the battery cover assembly 100 achieves sealing and insulation performance without adding extra space, resulting in a more compact overall structure. This improves the space utilization rate of the battery cell and supports the lightweighting of the battery cell.

[0127] A battery assembly according to a third aspect of the present invention includes: at least two battery cells according to a second aspect of the present invention and a connecting piece 200, wherein the connecting piece 200 is connected to the outer lead-out surface 32 of the at least two battery cells.

[0128] The battery module uses connecting pieces 200 to connect multiple battery cells with reliable insulation properties in series, facilitating the electrical connection of the battery cells within the module. Since the external lead-out surfaces 32 of each battery cell are located on the cover plate 10, and the lead-out parts 30 and the cover plate 10 have excellent sealing and insulation capabilities, no additional insulation structures or protective components are needed when making external connections, effectively avoiding the risk of short circuits caused by improper connection arrangement.

[0129] For further details, please refer to [link / reference]. Figure 3 The battery cover assembly 100 has a recess 371 formed at the outer lead-out surface 32. The battery assembly also includes an insulating sheet 300, which is disposed on the front surface 11 of the plate. One end of the insulating sheet 300 is bent and placed in the recess 371 and is connected to the seal 50.

[0130] An insulating sheet 300 is provided on the front side 11 of the plate, which can provide insulation protection for the surface of the cover plate 10.

[0131] One end of the insulating sheet 300 is provided with a bent portion, which is embedded in the recess 371 and connected or fixedly engaged with the sealing element 50, thereby achieving stable positioning of the insulating sheet 300 on the cover plate 10.

[0132] Meanwhile, the insulating sheet 300 is connected to the sealing element 50 to form a complete insulating cover, avoiding contact between the connecting piece 200 and the cover plate 10, and improving the safety and stability of the battery assembly.

[0133] A portion of the connecting piece 200 makes surface contact with the external lead surface 32. Here, the surface contact between the connecting piece 200 and the external lead surface 32 increases the effective contact area for current flow, which helps to reduce contact resistance, reduce the risk of local overheating, and improve the reliability of the electrical connection.

[0134] A portion of the connecting piece 200 contacts and engages with the insulating sheet 300. When the connecting piece 200 spans between two adjacent battery cells, the insulating sheet 300 is positioned between the connecting piece 200 and the battery cell housing, providing isolation. This arrangement ensures that the connecting piece 200 is electrically connected only to the corresponding lead 30, without contacting the battery cell housing. This avoids the risk of short circuits caused by accidental conduction between the connecting piece 200 and the housing, thus improving the safety and reliability of the battery assembly.

[0135] Further optional, such as Figure 10As shown, a portion of the seal 50 forms a connecting insulating sheet 55 that is in close contact with the front surface 11 of the plate. The outer lead-out surface 32 is flush with the surface of the connecting insulating sheet 55. A portion of the connecting piece 200 is in contact with the outer lead-out surface 32 and the connecting piece 200 is in contact with the connecting insulating sheet 55.

[0136] In the assembled state, a portion of the connecting piece 200 forms a surface contact with the outer lead-out surface 32, while the other portion forms an insulating contact with the surface of the connecting insulating piece 55. This achieves an electrical connection between the connecting piece 200 and the lead-out component 30, while simultaneously ensuring insulation between the connecting piece 200 and the cover plate 10.

[0137] By setting the surface of the external lead-out surface 32 and the surface of the connecting insulating sheet 55 to be flush, the connecting piece 200 can cover and connect between multiple battery cells in a relatively flat manner. This helps to improve the fit between the connecting piece 200 and each contact component, enhance the stability of the surface contact, increase the current flow area, reduce the contact resistance, reduce the risk of local heat generation, and improve the conductivity reliability and thermal stability of the battery assembly.

[0138] Meanwhile, the connecting piece 200 can cover multiple battery cells in a flat manner, which can reduce bending and improve assembly efficiency.

[0139] A battery pack according to a fourth aspect of the present invention includes a battery assembly according to a third aspect of the present invention.

[0140] The battery pack in this embodiment, by employing an improved battery assembly, facilitates higher stability and reliability.

[0141] An electrical device according to a fifth aspect of the present invention includes a battery pack according to a fourth aspect of the present invention.

[0142] It should be noted that the electrical equipment referred to here includes, but is not limited to, new energy vehicles, power tools, ships, and spacecraft. New energy vehicles can be pure electric vehicles, range-extended electric vehicles, etc. Specifically, a battery pack is installed within the vehicle. Here, the battery pack can be used to power the vehicle; for example, the battery pack can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the battery pack to supply power to the motor, for example, for the vehicle's starting, navigation, and operating power needs. In some embodiments of this application, the battery pack can not only serve as the vehicle's operating power source but also as the vehicle's drive power source, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0143] By adopting an improved battery pack, the stability and reliability of electrical equipment can be enhanced.

[0144] Combination Figures 12-20According to an embodiment of the sixth aspect of the present invention, a method for manufacturing the battery cover assembly 100 described above is provided. This method is used to manufacture the battery cover assembly 100 of the first aspect of the present invention, and the method includes:

[0145] S1: Combination Figures 12-13 Prepare an outlet element 30', a sealing element 50', and a cover plate 10 with a through hole 13. Place at least a portion of the sealing element 50' into the through hole 13, and place the outlet element 30' into the through hole 13 and surround it with the sealing element 50'.

[0146] Among them, the lead-out component 30' has an outer original surface 32' and an inner original surface 34' facing away from each other. The outer original surface 32' and the front surface 11 of the plate are located on the same side. One of the outer original surface 32' and the inner original surface 34' is provided with a stretching platform 373', and the other side is provided with a stretching groove 374' corresponding to the stretching platform 373'.

[0147] Furthermore, one of the walls of the through hole 13 and the outer peripheral surface of the lead-out component 30' is provided with a protrusion 41, and the other is provided with a groove 42.

[0148] In the above technical solution, combined with Figures 15-19 The lead-out element 30' is not yet fully unfolded and is still in a pre-formed state. The lead-out element 30' is a metal part and can be deformed according to subsequent processing requirements.

[0149] The sealing element 50' is initially positioned within the through hole 13 and surrounds the outer peripheral area of ​​the lead-out element 30', in preparation for subsequent sealing.

[0150] Meanwhile, between the through hole 13 wall of the cover plate 10 and the outer peripheral surface of the lead-out component 30', one is provided with a protrusion 41 structure and the other is provided with a corresponding groove 42 structure, the two forming a matching limiting structure.

[0151] S2: Press at least one of the outer original surface 32' and the inner original surface 34' to extend the lead-out element 30', and both the outer original surface 32' and the inner original surface 34' unfold into a plane. The lead-out element 30' unfolds into a lead-out element 30, and after extension, the protrusion 41 is embedded in the groove 42. At least a portion of the sealing element 50' is squeezed between the protrusion 41 and the inner wall of the groove 42, and the sealing element 50' is squeezed into a sealing element 50.

[0152] In step S2, pressure is applied to at least one of the outer lead-out surface 32 or the inner lead-out surface 34 of the lead-out element 30', causing it to undergo plastic deformation in a predetermined direction, thereby flattening and unfolding the lead-out element 30' which originally had a certain bent shape.

[0153] During this process, both the outer lead-out surface 32 and the inner lead-out surface 34 of the lead-out element 30' are unfolded into a planar structure, and the lead-out element 30' as a whole is transformed into a relatively flat lead-out element 30 shape. At the same time, the extension platform 373' set on the lead-out element 30' is embedded into the corresponding extension groove 374' to achieve structural fixation of the lead-out element 30' after deformation.

[0154] As the lead-out element 30' unfolds, the relative position between its lead-out peripheral surface 36 and the hole wall of the through hole 13 of the cover plate 10 changes, causing the protrusion 41 structure provided in one of them to embed into the groove 42 provided in the other. This fit not only achieves a stable connection between the lead-out element 30 and the cover plate 10, but also causes the sealing element 50' to be subjected to compression through structural changes.

[0155] Specifically, the sealing element 50' is clamped and compressed between the inner walls of the protrusion 41 and the groove 42. Due to the force, it deforms and conforms to the surrounding structure, ultimately forming a sealing and insulating effect. The sealing element 50 is tightly attached to the area around the through hole 13 of the cover plate 10 and is arranged around the lead-out member 30, effectively isolating the lead-out member 30 from direct contact with the cover plate 10 and ensuring the reliability of the battery.

[0156] In some optional embodiments, the compression of the sealing element 50' to the sealing element 50 in step S2 is between 25% and 50%.

[0157] During the process of being compressed and deformed into the sealing element 50, the compression amount of the sealing element 50' is controlled within the range of 25%-50%. This compression range ensures that the sealing element 50' produces sufficient deformation after being compressed to achieve good sealing performance, while avoiding material failure or insufficient rebound due to excessive compression, thereby ensuring the stability and long-term reliability of the sealing function.

[0158] Furthermore, the present invention also provides a set of structural dimensional relationships to guide the assembly between the lead-out element 30', the sealing element 50' and the cover plate 10, ensuring that each component can be smoothly assembled before the lead-out element 30 is formed, and that the sealing function is reliably established during the forming process.

[0159] Combination Figure 12-14 The width of the cover plate 10 is W11; the width of the through hole 13 in the cover plate 10 is W13; a groove 42 is provided in the through hole 13, and the width of the groove 42 is W12; the original width of the middle area of ​​the lead-out element 30' is L3, and the width of the lead-out element 30' including the part with protrusions 41 on both sides is L2; ​​the width of one end of the sealing element 50' with the sealing cover is W14, the width of the other end is W15, and the thickness of the sealing element 50' is W16; the outline length of the lead-out element 30' in the interval of length L3 is Z1.

[0160] Optionally, W13 = W15 = L2 + W16 is set. This relationship ensures that before the lead-out part 30 is formed, there is a reasonable assembly gap and positioning relationship between the lead-out part 30', the sealing part 50' and the cover plate 10, so that the components can deform in a coordinated manner and form a stable sealing structure during the subsequent pressure molding process.

[0161] Optionally, W11 = W14 is set, that is, the width of the cover plate 10 is equal to the width of the sealing cover 52 portion of the sealing element 50', so as to ensure that after assembly, the sealing cover 52 can completely cover the back of the cover plate 10, preventing direct contact between the electrode tab and the cover plate 10, thereby achieving reliable insulation isolation.

[0162] Further, optionally, combined Figure 1 and Figure 12-14 The compression of the sealing element 50' to the sealing element 50 can be calculated using the following formula:

[0163] Compression amount = W16[Z1+(L2-L3)+W16-W12]×100%. Where Z1 is the outline length of the lead-out element 30' within the L3 interval; Z1+(L2-L3) represents the final length L4 formed by the lead-out element 30' after being compressed and unfolded. The compression amount calculated using this formula should be controlled within the range of 25% to 50% to ensure that the sealing element 50' will not lose its sealing ability due to insufficient compression or undergo excessive deformation due to excessive compression, leading to seal failure.

[0164] Further, optionally, in step S1, combined with Figure 15 and Figure 20 The original element 30' has a metal flow control recess 375' on at least one of the outer original surface 32' and the inner original surface 34'.

[0165] It should be noted that when the lead-out element 30' is pressed down, the edge of the lead-out element 30' will be stretched along the edge tangent direction, thereby causing a change in the shape of the edge metal. This may affect the fit between the boss 372 on the lead-out element 30' and the recess in the cover plate 10. In this application, a metal flow control zone is provided so that the plastic deformation of the lead-out element 30' is concentrated in this area, thereby maintaining the shape of other areas and ensuring the fit accuracy. Optionally, there is at least one metal flow control recess 375'. Furthermore, when there are two or more metal flow control recesses 375', these metal flow control zones are evenly distributed along the circumference of the lead-out element 30'.

[0166] In some technical solutions, the metal flow control recess 375' is a thinning zone. That is, by locally reducing the thickness, the material part will preferentially undergo plastic deformation under stress; or, other forms of structure can be used, such as slotted parts, stepped transition zones, or material difference zones, as long as they can guide or restrict the direction of metal flow and control the deformation path during the forming process of the lead-out part 30.

[0167] In some technical solutions, the following condition is met: width of a single metal flow control zone * number of metal flow control zones * σ > k * (edge ​​perimeter of lead-out part 30 - edge perimeter of lead-out original part 30'), where σ is the elongation rate of the material of lead-out original part 30', and k is a safety factor with a value ranging from 1.2 to 2. The dimensions of the metal flow control zones are limited by the above relationship to ensure controllable metal flow during the forming process of lead-out part 30, thereby improving the consistency and sealing reliability of lead-out part 30 forming.

[0168] The following is for reference. Figure 1 - Figure 11 The battery cover assembly 100 according to an embodiment of the present invention is described in detail with reference to a specific example. It is to be understood that the following description is merely illustrative and not intended to limit the invention in any particular way.

[0169] Example 1

[0170] Reference Figure 1 and Figure 2 The battery cover assembly 100 includes: a cover 10, an outlet 30, and a seal 50.

[0171] The opposite sides of the cover plate 10 are the front side 11 and the back side 12, respectively, and the cover plate 10 is provided with a through hole 13 that runs from the front side 11 to the back side 12.

[0172] The lead-out member 30 is disposed in the through hole 13 and is used to conduct current. The lead-out member 30 has an outer lead-out surface 32 and an inner lead-out surface 34 facing away from each other, and a lead-out peripheral surface 36 connecting the outer lead-out surface 32 and the inner lead-out surface 34. The outer lead-out surface 32 and the front surface 11 of the plate are located on the same side.

[0173] The seal 50 is at least partially disposed between the hole wall of the through hole 13 and the lead-out peripheral surface 36 to achieve an insulating seal between the cover plate 10 and the lead-out member 30.

[0174] A protrusion 41 is provided on the peripheral surface 36, and a groove 42 is provided on the wall of the through hole 13. The protrusion 41 is embedded in the groove 42, and at least a portion of the seal 50 is squeezed between the protrusion 41 and the inner wall of the groove 42.

[0175] Reference Figure 3-Figure 5In the thickness direction of the battery cover assembly 100, the outer lead-out surface 32 and the inner lead-out surface 34 are located between the front side 11 and the back side 12 of the plate, so that the battery cover assembly 100 forms a recess 371 in the outer lead-out surface 32 and the inner lead-out surface 34.

[0176] Reference Figure 2 The sealing element 50 includes: a sealing ring 51, a sealing cap 52, a locking protrusion 53, and a tab 54. The sealing ring 51 is located between the hole wall of the through hole 13 and the lead-out peripheral surface 36, and the sealing ring 51 is arranged around the lead-out element 30.

[0177] The sealing cover 52 is in contact with the back of the plate 12, and the inner edge of the sealing cover 52 is connected to the sealing ring 51.

[0178] The back of the plate 12 is provided with a slot 121, and the sealing element 50 also includes a protrusion 53 that connects to the sealing cover 52 and is embedded in the slot 121.

[0179] Reference Figure 5 The electrode tab 54 is located on one side of the back side 12 of the cover plate 10, and one end of the electrode tab 54 is connected to the sealing ring 51. The electrode tab 54 consists of multiple pieces arranged circumferentially along the lead-out member 30, and a break seam 541 is provided between two adjacent electrode tab 54 pieces.

[0180] Example 2

[0181] Reference Figures 6-11 This embodiment is basically the same as Embodiment 1, except that...

[0182] Reference Figures 8-10 A groove 42 is provided on the peripheral surface 36, and a protrusion 41 is provided on the wall of the through hole 13.

[0183] Reference Figures 6-9 In the thickness direction of the battery cover assembly 100, the front side 11 and the back side 12 are both located between the outer lead-out surface 32 and the inner lead-out surface 34, so that the battery cover assembly 100 forms a boss 372 on the outer lead-out surface 32 and the inner lead-out surface 34.

[0184] A portion of the seal 50 forms a connecting insulating sheet 55, which is located on one side of the front surface 11 of the cover plate 10.

[0185] The connecting insulating sheet 55 has an angle with the front side of the plate 11, and the connecting insulating sheet 55 is inclined in a direction away from the lead-out member 30.

[0186] Other configurations of the battery cover assembly 100 according to embodiments of the present invention, such as the cover 10 and its operation, are known to those skilled in the art and will not be described in detail here.

[0187] In the description of this specification, references to terms such as "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0188] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A battery cover assembly, characterized in that, include: A cover plate, wherein the opposite sides of the cover plate are the front and back sides of the plate, respectively, and the cover plate is provided with a through hole extending from the front side to the back side of the plate; A lead-out member is disposed in the through hole and used to conduct current. The lead-out member has an outer lead-out surface and an inner lead-out surface facing away from each other, and a lead-out peripheral surface connecting the outer lead-out surface and the inner lead-out surface. The outer lead-out surface and the front surface of the plate are located on the same side. A sealing element, at least partially disposed between the wall of the through hole and the lead-out peripheral surface, to achieve an insulating seal between the cover plate and the lead-out element; The through hole wall and the lead-out peripheral surface are provided with a protrusion and a groove, respectively. The protrusion is embedded in the groove, and at least a portion of the seal is pressed between the protrusion and the inner wall of the groove.

2. The battery cover assembly according to claim 1, characterized in that, The protrusion is provided on the peripheral surface of the lead-out point; In the thickness direction of the battery cover assembly, at least one of the outer lead-out surface and the inner lead-out surface is located between the front side of the plate and the back side of the plate, so that the battery cover assembly forms a recess at at least one location on the outer lead-out surface and the inner lead-out surface.

3. The battery cover assembly according to claim 1, characterized in that, The through hole wall is provided with the protrusion; In the thickness direction of the battery cover assembly, at least one of the front and back surfaces of the plate is located between the outer lead-out surface and the inner lead-out surface, such that the battery cover assembly forms a boss at at least one location on the outer lead-out surface and the inner lead-out surface.

4. The battery cover assembly according to claim 1, characterized in that, The protrusion is provided on the peripheral surface of the lead-out part, and the lead-out part is an integrally stamped part; Alternatively, the wall of the through hole may be provided with the protrusion, and the cover plate may be an integrally stamped part.

5. The battery cover assembly according to claim 1, characterized in that, The groove is provided on the peripheral surface of the lead-out component, and the lead-out component is formed by connecting two metal sheets by vacuum diffusion welding. Alternatively, the wall of the through hole is provided with the groove, and the cover plate is formed by connecting two metal sheets by vacuum diffusion welding.

6. The battery cover assembly according to claim 3, characterized in that, The battery cover assembly forms the boss at the outer lead-out surface; A portion of the seal forms a connecting insulating sheet, which is located on one side of the front surface of the cover plate.

7. The battery cover assembly according to claim 6, characterized in that, The connecting insulating sheet has an angle with the front side of the plate, and the connecting insulating sheet is inclined away from the lead-out member.

8. The battery cover assembly according to any one of claims 1-7, characterized in that, The sealing element includes: A sealing ring is located between the wall of the through hole and the lead-out peripheral surface, and the sealing ring is arranged around the lead-out member.

9. The battery cover assembly according to claim 8, characterized in that, The sealing element further includes: A sealing cap is attached to the back of the plate, and the inner edge of the sealing cap is connected to the sealing ring.

10. The battery cover assembly according to claim 9, characterized in that, The back of the plate is provided with a slot, and the sealing element further includes a protrusion, which is connected to the sealing cover and is embedded in the slot.

11. The battery cover assembly according to claim 8, characterized in that, The sealing element further includes: a tab septum, the tab septum being located on one side of the back side of the cover plate, and one end of the tab septum being connected to the sealing ring.

12. The battery cover assembly according to claim 11, characterized in that, The electrode tabs are multiple pieces arranged circumferentially along the lead-out member, and there is a break seam between two adjacent electrode tabs.

13. A single battery cell, characterized in that, include: A housing, wherein the housing has an opening for receiving cavity; A battery cell is disposed in the receiving cavity, and the battery cell includes tabs; According to any one of claims 1-12, the battery cover assembly is disposed at the opening, the cover is connected to the housing, and the inner lead-out surface of the lead-out member is connected to the tab.

14. A battery assembly, characterized in that, include: At least two battery cells as described in claim 13; A connecting piece, the connecting piece being connected to the external lead-out surfaces of at least two of the battery cells.

15. The battery assembly according to claim 14, characterized in that, The battery cover assembly forms a recess at the outer lead-out surface; The battery assembly further includes: an insulating sheet disposed on the front side of the plate, one end of the insulating sheet being bent and placed in the recess and connected to the sealing element; A portion of the connecting piece is in surface contact with the outer lead-out surface, and a portion of the connecting piece is in surface contact with the insulating sheet.

16. The battery assembly according to claim 14, characterized in that, A portion of the seal forms a connecting insulating sheet that is in close contact with the front side of the plate. The outer lead-out surface is flush with the surface of the connecting insulating sheet. A portion of the connecting sheet is in surface contact with the outer lead-out surface and also in contact with the connecting insulating sheet.

17. A battery pack, characterized in that, Includes the battery assembly according to any one of claims 14-16.

18. An electrical appliance, characterized in that, Includes the battery pack according to claim 17.

19. A method for preparing a battery cover assembly, characterized in that, The method for manufacturing a battery cover assembly according to any one of claims 1-12 comprises: S1: Prepare the lead-out element, the sealing element, and the cover plate with the through hole; place at least a portion of the sealing element in the through hole; place the lead-out element in the through hole and surround it with the sealing element. The lead-out component has an outer surface and an inner surface facing away from each other. The outer surface and the front surface of the plate are located on the same side. One of the outer surface and the inner surface is provided with a stretching table, and the other surface is provided with a stretching groove corresponding to the stretching table. Furthermore, one of the through hole wall and the outer peripheral surface of the lead-out component is provided with the protrusion, and the other is provided with the groove; S2: Press at least one of the outer original surface and the inner original surface to extend the lead-out element, and both the outer original surface and the inner original surface unfold into a plane. The lead-out element unfolds into the lead-out element, and after extension, the protrusion is embedded in the groove. At least a portion of the sealing element is squeezed between the protrusion and the inner wall of the groove, and the sealing element is squeezed into the sealing element.

20. The method for preparing the battery cover assembly according to claim 19, characterized in that, In step S2, the compression of the sealing element to the sealing element is between 25% and 50%.

21. The method for preparing the battery cover assembly according to claim 19, characterized in that, In step S1, the lead-out element has a metal flow control recess at the edge on at least one of the outer surface and the inner surface.

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