Cover plate component, battery monomer, battery pack and electric equipment

Abstract

The invention provides a cover plate component, a battery monomer, a battery pack and electric equipment. The cover plate component comprises a cover plate, a pole and an insulating structure, the cover plate is provided with a through hole, the through hole comprises a main hole and an avoiding groove located in the circumferential edge of the main hole, the cover plate is provided with a solid convex part, and the avoiding groove and the solid convex part are distributed in the circumferential direction of the main hole; the pole comprises a pole body, a limiting bulge and a clamping bulge; the pole body is arranged in the main hole in a penetrating manner; the limiting protrusion and the clamping protrusion are arranged on the column body and protrude out of the peripheral face of the column body. The insulation structure insulates and isolates the pole and the cover plate; the limiting protrusion and the clamping protrusion are located on the two sides of the cover plate in the thickness direction, and the vertical projection of the limiting protrusion and the vertical projection of the clamping protrusion on the cover plate are overlapped with the solid protrusion so as to clamp the insulation structure and the solid protrusion in a matched mode. Wherein the avoiding groove is configured to be used for allowing the clamping protrusion to penetrate through when the cover plate component is disassembled and assembled. The cover plate component is convenient to disassemble and assemble, the assembly efficiency is improved, and the assembly cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electrical equipment, and in particular to a cover component, a battery cell, a battery pack and an electrical equipment. Background Art

[0002] Battery cells, such as soft-pack lithium-ion batteries, are widely used in power-consuming devices such as smartphones, laptops, and electric vehicles.

[0003] In the related art, the assembly process of the cover plate component of the battery cell is relatively complicated, the assembly efficiency is low, and the assembly cost is high. Summary of the Invention

[0004] In view of this, the present application provides a cover plate component, a battery cell, a battery pack and an electrical device. The cover plate component is simple to assemble, can reduce costs and improve assembly efficiency.

[0005] In a first aspect, the present application provides a cover plate component for a battery cell, comprising: a cover plate, a terminal post, and an insulating structure. The cover plate has a through hole extending through the cover plate along its thickness, the through hole comprising a main hole and a relief groove located around the main hole. The cover plate has a solid protrusion protruding toward the center of the main hole relative to the bottom wall of the relief groove, and the relief groove and the solid protrusion are distributed along the circumference of the main hole. The terminal post comprises a column, a limiting protrusion, and a latching protrusion, the column passing through the main hole. The limiting protrusion and the latching protrusion are both located on the column and protrude from the outer circumference of the column. The insulating structure insulates and isolates the terminal post from the cover plate. The limiting protrusion and the latching protrusion are located on opposite sides of the cover plate in the thickness direction, and their perpendicular projections to the cover plate overlap with the solid protrusion to cooperate in clamping the insulating structure and the solid protrusion. The relief groove is configured to allow the latching protrusion to pass through when the cover plate component is disassembled.

[0006] According to the cover plate component of the embodiment of the present application, by providing an avoidance groove on the periphery of the main hole and providing a latching protrusion on the column, when assembling the cover plate component, the pole can be first positioned as a whole on one side of the thickness direction of the cover plate, and the column and the main hole are directly opposite in the thickness direction of the cover plate, and the latching protrusion and the avoidance groove are directly opposite in the thickness direction of the cover plate. Then, the pole and / or the cover plate are moved along the thickness direction of the cover plate until the column is passed through the main hole and the latching protrusion passes through the avoidance groove and is located on the side of the cover plate that is away from the limiting protrusion. Then, the pole and / or the cover plate are rotated until the vertical projection of the latching protrusion on the cover plate overlaps with the solid protrusion, so that the latching protrusion and the limiting protrusion cooperate to clamp the insulating structure and the solid protrusion, thereby realizing the assembly of the cover plate component. When removing the cover plate component, the pole and / or cover plate can be rotated again (reverse rotation) to a position where the latch and the avoidance groove are opposite in the thickness direction of the cover plate, and then the pole and / or cover plate can be moved along the thickness direction of the cover plate. After the latch passes through the avoidance groove, the pole and the cover plate can be removed and separated. Not only does it achieve a detachable connection between the pole and the cover plate, but it is also easy to assemble and disassemble, which is beneficial to improving assembly efficiency and reducing assembly costs. In addition, the assembly process of the cover plate component does not require the use of a welding process, avoiding the hidden dangers of residual welding materials caused by the use of a welding process to assemble the cover plate component, thereby avoiding the short circuit problem of the battery cell caused by the residual welding materials, and then avoiding the problem of increased failure risk of the battery cell, which is beneficial to improving the service life of the battery cell.

[0007] In a possible implementation of the first aspect of the present application, there are multiple avoidance grooves, multiple solid protrusions and multiple latching protrusions, one avoidance groove, one solid protrusion and one latching protrusion correspond to each other, and multiple avoidance grooves and multiple solid protrusions are alternately arranged in the circumferential direction of the main hole.

[0008] In a possible implementation of the first aspect of the present application, a plurality of the avoidance grooves are evenly spaced apart in the circumferential direction of the main hole.

[0009] In a possible implementation of the first aspect of the present application, the limiting protrusion protrudes from the outer peripheral surface of the column along the entire circumference of the column; the cover plate component includes a sealing ring; the sealing ring is arranged around the through hole and abuts between the limiting protrusion and the cover plate.

[0010] In a possible implementation of the first aspect of the present application, the insulating structure includes: an annular first insulating part, the first insulating part is fixed to the cover plate and is clamped between the cover plate and the limiting protrusion, the first insulating part is arranged around the through hole, and the sealing ring is arranged on the outer periphery of the first insulating part.

[0011] In a possible implementation of the first aspect of the present application, the insulating structure includes an annular second insulating portion, the second insulating portion is clamped between the cover plate and the limiting protrusion, and the second insulating portion is sheathed around the outer periphery of the sealing ring.

[0012] In a possible implementation of the first aspect of the present application, the surface of the cover plate facing the limiting protrusion is provided with one of the first stop groove and the first stop column, and the surface of the first insulating part facing the cover plate is provided with the other of the first stop groove and the first stop column, and the first stop groove cooperates with the first stop column.

[0013] In a possible implementation of the first aspect of the present application, the insulating structure includes: a second insulating structure and a third insulating structure, the second insulating structure is clamped between the solid protrusion and the locking protrusion; the third insulating structure is located between the outer peripheral surface of the column and the hole wall of the through hole, and the third insulating structure is connected to one of the second insulating structure and the first insulating part, and is stopped at the other.

[0014] In a possible implementation of the first aspect of the present application, the overlapping width of the latching protrusion and the solid protrusion is greater than or equal to 0.3 mm and less than or equal to 2 mm.

[0015] In a possible implementation of the first aspect of the present application, the height of the protrusion is greater than or equal to 1 mm and less than or equal to 5 mm.

[0016] In a possible implementation of the first aspect of the present application, the locking protrusion, the limiting protrusion and the column are an integrally formed part.

[0017] In a second aspect, the present application provides a battery cell comprising: a housing, a pole group, and a cover member according to any of the above technical solutions. The housing has a receiving cavity with an opening; the pole group is located in the receiving cavity; and the cover member covers the opening.

[0018] In a third aspect, the present application provides a battery pack, comprising: a housing and the above-mentioned battery cell, wherein the battery cell is located in the housing.

[0019] In a fourth aspect, the present application provides an electrical device, comprising: an electrical main body and a power supply module, wherein the power supply module is electrically connected to the electrical main body to supply power to the electrical main body; wherein the power supply module is the above-mentioned battery cell, or the power supply module is the above-mentioned battery pack.

[0020] The technical effects of the second, third and fourth aspects of this application can refer to the technical effects of the first aspect mentioned above and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of an electrical device provided for this application;

[0022] Figure 2 Based on Figure 1 A cross-sectional view of the battery pack shown;

[0023] Figure 3 Based on Figure 2 A schematic diagram of a battery cell is shown;

[0024] Figure 4 Based on Figure 3 An exploded view of a battery cell is shown;

[0025] Figure 5 Based on Figure 4 An exploded view of the cover assembly is shown;

[0026] Figure 6 Based on Figure 5 A schematic diagram of the partial structure of the cover shown;

[0027] Figure 7 Based on Figure 5 A perspective view of the pole shown;

[0028] Figure 8 Based on Figure 4 A top view of the cover assembly shown;

[0029] Figure 9 Based on Figure 8 A cross-sectional view of the cover member shown at line AA;

[0030] Figure 10 Based on Figure 9 The structure shown is an enlarged view of the circled portion at B;

[0031] Figure 11 Based on Figure 5 The diagram of the partial structure of the cover and the matching of the pole is shown;

[0032] Figure 12 Based on Figure 5 Schematic diagram of the coordination of the second insulating structure, the cover plate and the pole.

[0033] Reference numerals:

[0034] Electrical equipment 1000;

[0035] Power supply module 100;

[0036] Battery cell 10; housing 1; open port 11; electrode group 2; positive electrode tab 21; negative electrode tab 22;

[0037] Cover plate component 3; cover plate 31; through hole 311; main hole 3111; avoidance groove 3112; solid protrusion 312; first anti-rotation groove 313; pole 32; column 321; limiting protrusion 322; locking protrusion 323; insulating structure 33; first insulating structure 331; first insulating portion 3311; first anti-rotation column 315; second insulating portion 3312; second insulating structure 332; third insulating structure 333; sealing ring 34;

[0038] Housing 20;

[0039] Power-consuming body 200; installation compartment 2001. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0041] In this application, the drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show details of the local features.

[0042] Unless otherwise indicated, all technical and scientific terms used in this application have the same meaning as those generally understood by those skilled in the art in the technical field of this application. The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit the scope of this application. The term "and / or" used in this application includes any and all combinations of one or more related listed items. The singular forms "a", "above", and "the" used in this application and the appended claims are also intended to include plural forms, unless the context clearly indicates otherwise.

[0043] In the description of this application, it should be understood that the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined. In the description of this application, "several" means one or more, unless otherwise clearly and specifically defined.

[0044] In the description of this application, the terms "center", "width", "thickness", "height", "inside", "outside", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of simplifying the description of this application, and do not indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, that is, they cannot be understood as limitations on this application.

[0045] In the description of this application, unless otherwise expressly defined, the terms "installed," "connected," "connect," "fixed," and "disposed" should be understood broadly. For example, "connection" can mean fixed, removable, or integrated; it can mean mechanical or electrical; it can mean direct or indirect connection through an intermediary; it can also mean internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0046] In related technologies, the battery cell cover assembly typically requires riveting or welding to assemble the terminal and cover. This complex assembly process results in high costs and low efficiency. Furthermore, welding can create a risk of residual welding material, which can cause a short circuit in the battery cell and increase the risk of failure.

[0047] Based on this, and to solve the above-mentioned technical problems, the present application provides a cover plate component that is detachably connected to the terminal post. This cover plate component is easy to assemble and disassemble, which helps improve assembly efficiency and reduce assembly costs. In addition, the assembly process of the cover plate component does not require the use of welding processes, avoiding the hidden dangers of residual welding materials caused by the use of welding processes to assemble the cover plate components in the related art. This further avoids the problem of short circuits in the battery cells caused by residual welding materials, and further avoids the problem of increased failure risk of the battery cells, which helps to increase the service life of the battery cells.

[0048] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0049] The present application provides an electrical device, including but not limited to mobile phones, tablet computers, laptop computers, electric toys, electric tools, battery-powered bicycles, electric cars, ships, and spacecraft.

[0050] See also Figure 1 , Figure 1 A schematic diagram of an electrical device 1000 provided in this application. Figure 1In the description, the electric device 1000 is an electric vehicle as an example, which cannot be regarded as a special limitation of the present application.

[0051] Please continue reading Figure 1 The power-consuming device 1000 includes a power-consuming body 200 and a power supply module 100 .

[0052] The power supply module 100 can be installed on the power-consuming entity 200 and electrically connected to the power-consuming entity 200 , so that the power supply module 100 can easily supply power to the power-consuming entity 200 .

[0053] Illustratively, the power-consuming body 200 has an installation compartment 2001 , and the power supply module 100 is installed in the installation compartment 2001 .

[0054] The power supply module 100 may be a battery pack or a battery cell 10. In the following description, the power supply module 100 is taken as an example of a battery pack.

[0055] See also Figure 2 , Figure 2 Based on Figure 1 The battery pack includes a housing 20 and a battery cell 10. The battery cell 10 is installed in the housing 20. In this way, the housing 20 can be used to protect the battery cell 10, thereby improving the safety of the battery cell 10.

[0056] The battery cell 10 refers to a basic unit that can realize mutual conversion between chemical energy and electrical energy.

[0057] For example, the battery cell 10 may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell 10 is discharged.

[0058] The battery cell 10 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0059] Each battery pack may contain one or more battery cells 10. When there are multiple battery cells 10, the multiple battery cells 10 may be connected in series, in parallel, or in a mixed connection. Mixed connection of multiple battery cells 10 means that the electrical connections among the multiple battery cells 10 are both in series and in parallel.

[0060] See also Figure 3 and Figure 4 , Figure 3 Based on Figure 2 The schematic diagram of the battery cell 10 shown in FIG. Figure 4 Based on Figure 3 The exploded view of the battery cell 10 is shown. The battery cell 10 includes a housing 1 , a pole group 2 and a cover member 3 .

[0061] The housing 1 has a receiving cavity for receiving the electrode group 2 and the electrolyte. The receiving cavity has an open opening 11 .

[0062] The housing 1 can be a rigid member. For example, the housing 1 is made of steel or aluminum. As a result, the housing 1 has a relatively high structural strength and provides good protection for the electrode group 2.

[0063] Of course, in other embodiments, the shell 1 can be a flexible part. Since the flexible part has a certain degree of flexible deformation ability, when the battery cell 10 is out of control or punctured due to thermal management, the flexible part will provide a buffer space for the electrode group 2 and bulge and deform, which greatly reduces the risk of explosion of the battery cell 10, thereby helping to improve the safety performance of users using the battery cell 10. Exemplarily, the material of the flexible part is aluminum-plastic film. The aluminum-plastic film includes at least three layers of material, the middle layer is an aluminum layer, which serves to isolate moisture. The outer layer is a nylon adhesive layer, which prevents the penetration of air, especially oxygen. The inner layer is a polypropylene (PP) layer, which seals and prevents the electrolyte from corroding the aluminum layer.

[0064] The cover member 3 covers the opening 11. The cover member 3 cooperates with the housing 1 to close the opening 11 of the accommodating chamber, thereby preventing leakage of the electrolyte.

[0065] The electrode group 2 is located in the accommodation cavity and immersed in the electrolyte.

[0066] Electrode assembly 2 typically includes a positive electrode sheet, a negative electrode sheet, and a separator. Both the positive and negative electrode sheets include a current collector and an electrode material coated on the current collector. Exemplarily, the current collector for the positive electrode sheet is aluminum foil, while the current collector for the negative electrode sheet is copper foil.

[0067] The separator is disposed between the positive electrode sheet and the negative electrode sheet to separate the positive electrode sheet and the negative electrode sheet of the electrode group 2 to prevent the two electrodes from directly contacting each other and causing a short circuit.

[0068] In order to facilitate the electrical connection of the electrode group 2 to the circuit, for example, please continue to refer to Figure 4 The electrode group 2 has a positive electrode tab 21 and a negative electrode tab 22 .

[0069] The positive electrode tab 21 can be connected to the current collector of the positive electrode sheet by assembly (for example, welding), or it can be formed by directly extending outward from the edge of the current collector of the positive electrode sheet, or by leaving a portion of the current collector of the positive electrode sheet blank (that is, an area where no electrode material is provided).

[0070] Similarly, the negative electrode tab 22 can be connected to the current collector of the negative electrode sheet by assembly (for example, welding), or it can be formed by directly extending the current collector of the negative electrode sheet outward, or it can be formed by leaving a portion of the current collector of the negative electrode sheet blank (that is, an area where no electrode material is provided).

[0071] In order to facilitate the electrical signal of the electrode group 2 to be led out of the housing 1, please refer to Figure 5 , Figure 5 Based on Figure 4 The exploded view of the cover component 3 is shown. The cover component 3 includes a cover 31 , a pole 32 and an insulating structure 33 .

[0072] The cover plate 31 may be in the shape of a flat plate. For example, the cover plate 31 may be in the shape of a rectangular flat plate, a circular flat plate, or a special-shaped flat plate.

[0073] The cover plate 31 is disposed over the opening 11. For example, a step is formed on the end surface of the housing 1 where the opening 11 is located, and the cover plate 31 can be supported and fixed on the step. For another example, the end surface of the housing 1 where the opening 11 is located can also be free of a step, and the cover plate 31 can be supported and fixed on the end surface of the housing 1 where the opening 11 is located.

[0074] The connection between the cover plate 31 and the housing 1 includes but is not limited to gluing, welding, or clamping.

[0075] The cover plate 31 may be made of aluminum, for example, a plain aluminum plate. Aluminum has advantages such as being lightweight, corrosion-resistant, having high structural strength, and being easy to process. In other embodiments, the cover plate 31 may be made of other metals or other non-metallic materials.

[0076] Please continue reading Figure 5 The cover plate 31 has a through hole 311 that penetrates the cover plate 31 along its thickness direction F1.

[0077] See also Figure 6 , Figure 6 Based on Figure 5 The schematic diagram of the partial structure of the cover plate 31 is shown. The through hole 311 includes a main hole 3111 and an avoidance groove 3112.

[0078] The shape of the main hole 3111 includes but is not limited to round, square or irregular.

[0079] The avoidance groove 3112 is located at the periphery of the main hole 3111 and is in communication with the main hole 3111. The avoidance groove 3112 penetrates the cover plate 31 along the thickness direction F1 of the cover plate 31.

[0080] The cover plate 31 has a solid protrusion 312. The solid protrusion 312 is located on the periphery of the main hole 3111. The solid protrusion 312 protrudes toward the center of the main hole 3111 relative to the bottom wall of the avoidance groove 3112. The solid protrusion 312 and the avoidance groove 3112 are distributed along the circumference of the main hole 3111.

[0081] The pole 32 is used to be electrically connected to the pole tab of the pole group 2 .

[0082] See also Figure 7 , Figure 7 Based on Figure 5 The pole 32 includes a column 321, a limiting protrusion 322 and a locking protrusion 323.

[0083] The column 321 may be formed in a cylindrical shape, a triangular prism shape, a quadrangular prism shape, an elliptical column shape, or a special-shaped column shape.

[0084] The limiting protrusion 322 and the locking protrusion 323 are both provided on the column 321 and protrude from the outer peripheral surface of the column 321. The limiting protrusion 322 and the locking protrusion 323 are spaced apart along the axial direction of the column 321.

[0085] For example, both the limiting protrusion 322 and the locking protrusion 323 can be provided on the outer circumferential surface of the column 321. For another example, the limiting protrusion 322 can be provided on the end surface of one axial end of the column 321, and the locking protrusion 323 can be provided on the end surface of the other axial end of the column 321. For another example, the limiting protrusion 322 can be provided on the outer circumferential surface of the column 321, and the locking protrusion 323 can be provided on the end surface of one axial end of the column 321.

[0086] The limiting protrusion 322 and the column 321 are integrally formed. This helps improve the connection strength between the limiting protrusion 322 and the column 321, simplifies the processing, and reduces manufacturing costs. Of course, the present application is not limited to this. In other embodiments, the limiting protrusion 322 and the column 321 can also be connected by welding, gluing, screw connection, or clamping.

[0087] The latching protrusion 323 and the column 321 are integrally formed. This helps to improve the connection strength between the latching protrusion 323 and the column 321, simplify the processing technology, and reduce manufacturing costs. Of course, the present application is not limited to this. In other embodiments, the latching protrusion 323 and the column 321 can also be connected by welding, gluing, screw connection, or clamping.

[0088] On this basis, the limiting protrusion 322, the locking protrusion 323 and the column 321 are formed as an integral part. This helps to improve the connection strength between the locking protrusion 323 and the column 321 and between the limiting protrusion 322 and the column 321, simplify the processing technology of the entire pole 32, and reduce manufacturing costs.

[0089] See also Figure 8 、 Figure 9 and Figure 10 , Figure 8 Based on Figure 4 A top view of the cover member 3 is shown; Figure 9 Based on Figure 8 The cross-sectional view of the cover member 3 shown is taken along line AA; Figure 10 Based on Figure 9 The structure shown is an enlarged view of the circled portion at B. The column 321 is inserted into the main hole 3111. In this way, the pole 32 can be electrically connected to the tab of the pole group 2 via the column 321.

[0090] Exemplarily, the circumferential profiles of the column 321 and the main hole 3111 are similar. Of course, the circumferential profiles of the two may also be different.

[0091] For example, in order to facilitate assembly and disassembly, the circumferential dimension of the main hole 3111 is larger than the circumferential dimension of the column 321, that is, there is a gap between the column 321 and the main hole 3111. Of course, the column 321 and the main hole 3111 can also be completely adapted. The limiting protrusion 322 and the locking protrusion 323 are located on both sides of the cover plate 31 in the thickness direction F1. Figure 10 In the specific example shown, the latching protrusion 323 is located on the inner side of the cover plate 31 (i.e., the side of the cover plate 31 facing the interior of the housing 1), and the limiting protrusion 322 is located on the outer side of the cover plate 31 (i.e., the side of the cover plate 31 facing away from the interior of the housing 1). In other embodiments, the latching protrusion 323 is located on the outer side of the cover plate 31, and the limiting protrusion 322 is located on the inner side of the cover plate 31.

[0092] Please continue reading Figure 10 , and combined with Figure 11 , Figure 11 Based on Figure 5 The diagram shows the cooperation between the partial structure of the cover plate 31 and the pole 32. The vertical projections of the limiting protrusion 322 and the locking protrusion 323 on the cover plate 31 overlap with the solid protrusion 312.

[0093] The insulating structure 33 is disposed between the pole 32 and the cover plate 31 to insulate and isolate the pole 32 and the cover plate 31 .

[0094] Please continue reading Figure 10 The limiting protrusion 322 and the locking protrusion 323 cooperate to clamp the insulating structure 33 and the solid protrusion 312.

[0095] The avoidance groove 3112 is configured to allow the latching protrusion 323 to pass through when the cover component 3 is being disassembled or assembled.

[0096] Specifically, when assembling the cover plate component 3, the entire terminal post 32 can be first positioned on one side (e.g., the outside) of the cover plate 31 in the thickness direction F1, with the post 321 aligning with the main hole 3111 in the thickness direction F1 of the cover plate 31, and the latching protrusion 323 aligning with the avoidance groove 3112 in the thickness direction F1 of the cover plate 31. The terminal post 32 and / or the cover plate 31 are then moved along the thickness direction F1 of the cover plate 31 until the post 321 is inserted into the main hole 3111 and the latching protrusion 323 is located within the avoidance groove 3112. The terminal post 32 and / or the cover plate 31 are further moved along the thickness direction F1 of the cover plate 31, with the latching protrusion 323 located on the side of the cover plate 31 facing away from the stopper protrusion 322. Then rotate the pole 32 and / or the cover 31 until the vertical projection of the locking protrusion 323 on the cover 31 overlaps with the solid protrusion 312, so that the locking protrusion 323 cooperates with the limiting protrusion 322 to clamp the insulating structure 33 and the solid protrusion 312, thereby completing the assembly of the cover component 3.

[0097] When removing the cover plate component 3, the pole 32 and / or the cover plate 31 can be rotated again (reverse rotation) until the latch 323 and the avoidance groove 3112 are opposite to each other in the thickness direction F1 of the cover plate 31, and then the pole 32 and / or the cover plate 31 can be moved along the thickness direction F1 of the cover plate 31. After the latch 323 passes through the avoidance groove 3112, the pole 32 and the cover plate 31 can be removed and separated.

[0098] As can be seen from the above description, the cover plate component 3 of the embodiment of the present application not only achieves a detachable connection between the terminal 32 and the cover plate 31, but also facilitates assembly and disassembly, thereby improving assembly efficiency and reducing assembly costs. Furthermore, the assembly process of the cover plate component 3 does not require the use of welding processes, thus avoiding the hidden danger of residual welding material caused by the use of welding processes to assemble the cover plate component 3 in the related art. This further avoids the problem of short circuits in the battery cells 10 caused by residual welding material, thereby avoiding the problem of increased failure risk of the battery cells 10, and thus improving the service life of the battery cells 10.

[0099] Exemplarily, the shape of the locking protrusion 323 is similar to that of the avoidance groove 3112. In this way, when the cover component 3 is disassembled, the locking protrusion 323 can be easily passed through the avoidance groove 3112.

[0100] Illustratively, the outline dimension of the escape groove 3112 in a direction perpendicular to the thickness of the cover plate 31 is greater than the outline dimension of the latch protrusion 323 in a direction perpendicular to the thickness of the cover plate 31. Thus, when the cover plate component 3 is removed and assembled, when the latch protrusion 323 is located in the escape groove 3112, a certain gap exists between the latch protrusion 323 and the groove wall of the escape groove 3112, thereby facilitating the latch protrusion 323 to pass through the escape groove 3112. In other embodiments, when the cover plate component 3 is removed and assembled, when the latch protrusion 323 is located in the escape groove 3112, the latch protrusion 323 and the escape groove 3112 may be adapted to each other, or have a certain transition fit, as long as the latch protrusion 323 can pass through the escape groove 3112.

[0101] In some embodiments of this application, please continue to refer to Figure 10 and Figure 11 There are multiple avoidance grooves 3112, multiple solid protrusions 312, and multiple locking protrusions 323. One avoidance groove 3112, one solid protrusion 312, and one locking protrusion 323 correspond to each other. Multiple avoidance grooves 3112 and multiple solid protrusions 312 are alternately arranged circumferentially around the through-hole 311. This ensures that the holding force exerted by the locking protrusions 323 and the limiting protrusions 322 on the cover plate 31 and the insulating structure 33 is relatively evenly distributed around the circumference of the through-hole 311, thereby improving the reliability of the clamping of the cover plate 31 and the insulating structure 33 by the locking protrusions 323 and the limiting protrusions 322.

[0102] exist Figure 10 and Figure 11 In the specific example shown, there are four avoidance grooves 3112, four solid protrusions 312 and four latching protrusions 323. In other examples, there are two, three or five avoidance grooves 3112, four solid protrusions 312 and four latching protrusions 323.

[0103] It should be noted that the correspondence between one avoidance groove 3112, one solid protrusion 312, and one latching protrusion 323 means that during assembly and disassembly of the cover component 3, one avoidance groove 3112 and one latching protrusion 323 are directly opposite each other in the thickness direction F1 of the cover 31. After assembly of the cover component 3, the vertical projections of one solid protrusion 312 and one latching protrusion 323 on the cover 31 overlap.

[0104] For example, multiple avoidance grooves 3112 are evenly spaced around the circumference of the main hole 3111. Thus, multiple solid protrusions 312 are evenly spaced around the circumference of the main hole 3111, and multiple latching protrusions 323 are evenly spaced around the circumference of the column 321. This ensures that the holding force exerted by the latching protrusions 323 and the limiting protrusions 322 on the cover plate 31 and the insulating structure 33 is evenly distributed around the circumference of the through-hole 311, thereby improving the reliability of the latching protrusions 323 and the limiting protrusions 322 in clamping the cover plate 31 and the insulating structure 33 and preventing the pole 32 from detaching from the cover plate 31.

[0105] In some embodiments of this application, please continue to refer to Figure 10 and Figure 11 The overlap width d between the latch protrusion 323 and the solid protrusion 312 is greater than or equal to 0.3 mm and less than or equal to 2 mm. In other words, the radial width d of the overlapping area formed by the vertical projection of the latch protrusion 323 on the cover plate 31 and the solid protrusion 312 is greater than or equal to 0.3 mm and less than or equal to 2 mm.

[0106] In this way, on the one hand, it is beneficial to increase the matching area between the locking protrusion 323 and the solid protrusion 312, ensure the reliability of the clamping of the locking protrusion 323 and the limiting protrusion 322 on the insulating structure 33 and the cover plate 31, and avoid the problem of the pole 32 loosening; on the other hand, it is beneficial to avoid the problem of weakening the structural strength of the cover plate 31 due to the size of the avoidance groove 3112 being designed too large due to the size of the locking protrusion 323 being too large.

[0107] Exemplarily, the overlapping width d between the latching protrusion 323 and the solid protrusion 312 is 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm or 1.9 mm.

[0108] In some embodiments of the present application, the height h of the latching protrusion 323 is greater than or equal to 1 mm and less than or equal to 5 mm. This not only helps to improve the structural strength of the latching protrusion 323 itself, but also helps to increase the connection area between the latching protrusion 323 and the outer peripheral surface of the column 321 when the latching protrusion 323 is connected to the outer peripheral surface of the column 321, thereby improving the connection reliability between the latching protrusion 323 and the column 321.

[0109] Exemplarily, the height h of the protrusion 323 is 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, or 4.9mm.

[0110] In some embodiments of this application, please continue to refer to Figure 10 The limiting protrusion 322 protrudes from the outer peripheral surface of the column 321 along the entire circumference of the column 321. For example, the limiting protrusion 322 is fixed to the outer peripheral surface of the column 321 and extends along the circumference of the column 321 to form a closed loop.

[0111] Please continue reading Figure 10 , and combined with Figure 5 The cover member 3 includes a sealing ring 34. The material of the sealing ring 34 includes but is not limited to rubber or silicone.

[0112] The sealing ring 34 is arranged around the through hole 311 and abuts between the limiting protrusion 322 and the cover plate 31. In this way, the provision of the sealing ring 34 is conducive to improving the sealing performance of the cover plate component 3 to the open port 11, thereby preventing leakage of the electrolyte.

[0113] Of course, it is understandable that in other embodiments, the limiting protrusion 322 may not protrude from the outer peripheral surface of the column 321 along the entire circumference of the column 321. For example, there are multiple limiting protrusions 322, and the multiple limiting protrusions 322 are spaced apart along the circumference of the column 321.

[0114] In some embodiments of this application, please continue to refer to Figure 10 , and combined with Figure 5 The insulating structure 33 includes a first insulating structure 331 , a second insulating structure 332 and a third insulating structure 333 .

[0115] The first insulating structure 331 is located between the cover plate 31 and the limiting protrusion 322 .

[0116] Please continue reading Figure 10 , and combined with Figure 5 The first insulating structure 331 includes: a ring-shaped first insulating portion 3311.

[0117] The material of the first insulating portion 3311 includes but is not limited to plastic, such as polyphenylenesulfide (PPS) or polypropylene (PP).

[0118] The first insulating portion 3311 is fixed to the cover plate 31. It should be explained that the first insulating portion 3311 is fixed to the cover plate 31, which means that the assembly relationship between the first insulating portion 3311 and the cover plate 31 makes them relatively fixed and cannot move relative to each other.

[0119] The first insulating portion 3311 is clamped between the cover plate 31 and the limiting protrusion 322. The first insulating portion 3311 is disposed around the through hole 311. The sealing ring 34 is sleeved on the outer circumference of the first insulating portion 3311.

[0120] Specifically, since the first insulating part 3311 is fixed to the cover plate 31, the first insulating part 3311 cannot rotate or move relative to the cover plate 31. In addition, the sealing ring 34 is sheathed on the first insulating part 3311. When the cover plate component 3 is disassembled and assembled, the pole 32 and the cover plate 31 rotate relative to each other, which can prevent the sealing ring 34 from rotating with the rotation of the pole 32, thereby avoiding the problem of displacement or deviation of the sealing ring 34, which is conducive to improving the sealing performance.

[0121] For example, please see Figure 10 The surface of the cover plate 31 facing the limiting protrusion 322 is provided with a first anti-rotation groove 313. The surface of the first insulating portion 3311 facing the cover plate 31 is provided with a first anti-rotation post 315. The first anti-rotation groove 313 cooperates with the first anti-rotation post 315. In this way, the cooperation between the first anti-rotation groove 313 and the first anti-rotation post 315 can prevent the first insulating portion 3311 from rotating relative to the cover plate 31, thereby achieving relative fixation between the first insulating portion 3311 and the cover plate 31.

[0122] For example, the first anti-rotation post 315 and the first anti-rotation groove 313 may be an interference fit. This further prevents the first insulating portion 3311 from rotating relative to the cover plate 31, thereby securing the first insulating portion 3311 relative to the cover plate 31. Of course, the present application is not limited thereto; in other embodiments, the first anti-rotation post 315 and the first anti-rotation groove 313 may be adapted to each other.

[0123] In other embodiments, the surface of the cover plate 31 facing the limiting protrusion 322 is provided with a first anti-rotation column. The surface of the first insulating portion 3311 facing the cover plate 31 is provided with a first anti-rotation groove. As long as it is ensured that the surface of the cover plate 31 facing the limiting protrusion 322 is provided with one of the first anti-rotation groove and the first anti-rotation column, the surface of the first insulating portion 3311 facing the cover plate 31 is provided with the other of the first anti-rotation groove and the first anti-rotation column. Alternatively, in other embodiments, the cover plate 31 and the first insulating portion 3311 can also be fixed by gluing or screwing.

[0124] Exemplarily, there are multiple first anti-rotation grooves 313 and first anti-rotation posts 315, each corresponding to the other. Multiple first anti-rotation grooves 313 are spaced apart and distributed along the circumference of the through hole 311. This helps further improve the fixing reliability between the first insulating portion 3311 and the cover plate 31, and achieves a better anti-rotation effect.

[0125] Specifically, the plurality of first anti-rotation grooves 313 are evenly spaced and distributed along the circumference of the through hole 311. This helps to improve the fixing reliability between the first insulating portion 3311 and the cover plate 31, and achieves a better anti-rotation effect.

[0126] Illustratively, the inner circumferential surface of the first insulating portion 3311 extends in the circumferential direction of the through hole 311 in a manner consistent with the circumferential extension of the through hole 311. This helps improve the compatibility between the first insulating portion 3311 and the through hole 311.

[0127] Based on the above-mentioned first insulating portion 3311, in some embodiments, please continue to refer to Figure 10 , and combined with Figure 5 The first insulating structure 331 further includes a ring-shaped second insulating portion 3312 .

[0128] The material of the second insulating portion 3312 includes but is not limited to plastic, for example, PPS or PP.

[0129] Please continue reading Figure 10 The second insulating portion 3312 is clamped between the cover plate 31 and the limiting protrusion 322. The second insulating portion 3312 is positioned over the outer circumference of the sealing ring 34. This allows the first insulating portion 3311 and the second insulating portion 3312 to cooperate and clamp the sealing ring 34, limiting radial deformation of the sealing ring 34 along the through-hole 311. This allows the sealing ring 34 to deform more axially along the through-hole 311, thereby improving the sealing effect of the sealing ring 34.

[0130] On this basis, in order to further improve the limiting effect of the second insulating portion 3312 on the sealing ring 34 , the second insulating portion 3312 can be fixed to the cover plate 31 .

[0131] For example, a second anti-rotation groove is provided on the surface of the cover plate 31 facing the stop protrusion 322. A second anti-rotation post is provided on the surface of the second insulating portion 3312 facing the cover plate 31. The second anti-rotation groove cooperates with the second anti-rotation post. Thus, the cooperation between the second anti-rotation groove and the second anti-rotation post prevents the second insulating portion 3312 from rotating relative to the cover plate 31, thereby achieving relative fixation between the second insulating portion 3312 and the cover plate 31.

[0132] For example, the second anti-rotation post and the second anti-rotation groove can be an interference fit. This can further prevent the second insulating portion 3312 from rotating relative to the cover plate 31, thereby achieving relative fixation between the second insulating portion 3312 and the cover plate 31. Of course, the present application is not limited to this. In other embodiments, the second anti-rotation post and the second anti-rotation groove can be adapted.

[0133] In other embodiments, the surface of the cover plate 31 facing the limiting protrusion 322 is provided with a second anti-rotation column. The surface of the second insulating portion 3312 facing the cover plate 31 is provided with a second anti-rotation groove. As long as it is ensured that the surface of the cover plate 31 facing the limiting protrusion 322 is provided with one of the second anti-rotation groove and the second anti-rotation column, the surface of the second insulating portion 3312 facing the cover plate 31 is provided with the other of the second anti-rotation groove and the second anti-rotation column. Alternatively, in other embodiments, the cover plate 31 and the second insulating portion 3312 can also be fixed by gluing or screwing.

[0134] Exemplarily, there are multiple second anti-rotation grooves and second anti-rotation posts in a one-to-one correspondence. The multiple second anti-rotation grooves are spaced apart and distributed along the circumference of the through hole 311. This helps to further improve the fixing reliability between the second insulating portion 3312 and the cover plate 31, and the anti-rotation effect is better.

[0135] Specifically, the plurality of second anti-rotation grooves are evenly spaced and distributed along the circumference of the through hole 311. This is conducive to improving the fixing reliability between the second insulating portion 3312 and the cover plate 31, and the anti-rotation effect is better.

[0136] Please continue reading Figure 10 and Figure 12 , Figure 12 Based on Figure 5 The second insulating structure 332 is located on the side of the cover plate 31 facing the latching protrusion 323 .

[0137] The material of the second insulating structure 332 includes but is not limited to plastic, such as PPS or PP.

[0138] The second insulating structure 332 is clamped between the cover 31 and the locking protrusion 323 .

[0139] The material of the third insulating structure 333 includes but is not limited to plastic, for example, PPS or PP.

[0140] The third insulating structure 333 is located between the outer peripheral surface of the column 321 and the hole wall of the through hole 311. The third insulating structure 333 is connected to one of the second insulating structure 332 and the first insulating part 3311, and abuts against the other. That is, when the third insulating structure 333 is connected to the second insulating structure 332, the third insulating structure 333 abuts against the first insulating part 3311; when the third insulating structure 333 is connected to the first insulating part 3311, the third insulating structure 333 abuts against the second insulating structure 332. In this way, the insulating structure 33 can be used to effectively insulate and isolate the pole 32 from the cover plate 31, and the setting of the third insulating structure 333 will not affect the detachable connection between the pole 32 and the cover plate 31.

[0141] Illustratively, when the third insulating structure 333 is connected to the second insulating structure 332 and the third insulating structure 333 abuts against the first insulating portion 3311, the third insulating structure 333 and the second insulating structure 332 are an integrally formed part, thereby simplifying the processing technology of the third insulating structure 333 and the second insulating structure 332 and reducing manufacturing costs.

[0142] When the third insulating structure 333 is connected to the first insulating portion 3311 and the third insulating structure 333 is stopped against the second insulating structure 332, the third insulating structure 333 and the first insulating portion 3311 are integrally formed, thereby simplifying the processing technology of the third insulating structure 333 and the first insulating portion 3311 and reducing manufacturing costs.

[0143] It is understandable that in other embodiments, when there is a gap between the column 321 and the wall of the through hole 311 , the third insulating structure 333 may not be provided.

[0144] Based on any of the above examples, please refer back to Figure 4 and Figure 5 The positive electrode tab 21 and the negative electrode tab 22 of the electrode group 2 are both located at one end of the electrode group 2 facing the cover member 3 .

[0145] Based on this, to facilitate electrical connection between the electrode 32 and the positive and negative tabs 21 and 22 described above, the through-hole 311, electrode 32, and insulating structure 33 can each be two, and divided into two groups of connection assemblies. Each group of connection assemblies includes a through-hole 311, a electrode 32, and an insulating structure 33. Of the two groups of connection assemblies, the electrode 32 in one group is a positive electrode, and the electrode 32 in the other group is a negative electrode.

[0146] The positive electrode column is electrically connected to the positive electrode tab 21 , and the negative electrode column is electrically connected to the negative electrode tab 22 .

[0147] On this basis, in order to simplify the assembly of the cover component 3, the second insulating structures 332 in the two sets of connection components are connected as an integrally formed part. Of course, the present application is not limited to this. In other embodiments, the second insulating structures 332 in the two sets of connection components can also be unconnected and independent of each other.

[0148] It is worth noting that when the end of the pole group 2 facing the cover part 3 is only provided with a pole ear of one polarity (for example, the positive pole ear 21, or the negative pole ear 22), the connecting component in the cover part 3 can be only one group, and the pole 32 of this group of connecting components is electrically connected to the pole ear at the end of the pole group 2 facing the cover part 3.

[0149] It can be understood that in the various embodiments of the present application, the size of the serial number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0150] It can be understood that the various implementation methods described in this application can be implemented individually or in combination, and the embodiments of this application are not limited to this.

[0151] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems, devices and units can refer to the corresponding processes in the aforementioned method implementation methods and will not be repeated here.

[0152] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A cover plate component of a battery cell, characterized in that: include: A cover plate, the cover plate having a through hole extending through the cover plate along its thickness direction, the through hole comprising a main hole and an avoidance groove located at a circumference of the main hole, the cover plate having a solid protrusion protruding toward the center of the main hole relative to a bottom wall of the avoidance groove, the avoidance groove and the solid protrusion being distributed along the circumference of the main hole; The pole comprises a column, a limiting protrusion and a locking protrusion, wherein the column is passed through the main hole; the limiting protrusion and the locking protrusion are both provided on the column and protrude from the outer peripheral surface of the column; an insulating structure, wherein the insulating structure insulates and isolates the pole and the cover plate; the limiting protrusion and the clamping protrusion are located on both sides of the cover plate in the thickness direction, and the vertical projections of the limiting protrusion and the clamping protrusion overlap with the solid protrusion to cooperate with clamping the insulating structure and the solid protrusion; The avoidance groove is configured to allow the latching protrusion to pass through when the cover component is disassembled or assembled.

2. The cover member of the battery cell according to claim 1, wherein: There are multiple avoidance grooves, multiple solid protrusions and multiple clamping protrusions, one avoidance groove, one solid protrusion and one clamping protrusion correspond to each other, and multiple avoidance grooves and multiple solid protrusions are alternately arranged in the circumferential direction of the main hole.

3. The cover member of the battery cell according to claim 2, wherein: The plurality of avoidance grooves are evenly spaced apart in the circumferential direction of the main hole.

4. The cover member of the battery cell according to any one of claims 1 to 3, characterized in that: The limiting protrusion protrudes from the outer peripheral surface of the cylinder along the entire circumference of the cylinder; The cover plate component includes a sealing ring; the sealing ring is arranged around the through hole and abuts between the limiting protrusion and the cover plate.

5. The cover member of the battery cell according to claim 4, characterized in that: The insulating structure includes: an annular first insulating part, which is fixed to the cover plate and clamped between the cover plate and the limiting protrusion. The first insulating part is arranged around the through hole, and the sealing ring is sleeved on the outer periphery of the first insulating part.

6. The cover member of the battery cell according to claim 5, characterized in that: The insulating structure includes an annular second insulating portion, the second insulating portion is clamped between the cover plate and the limiting protrusion, and the second insulating portion is sheathed around the outer circumference of the sealing ring; and / or, The surface of the cover plate facing the limiting protrusion is provided with one of a first anti-rotation groove and a first anti-rotation column, and the surface of the first insulating portion facing the cover plate is provided with the other of the first anti-rotation groove and the first anti-rotation column, and the first anti-rotation groove cooperates with the first anti-rotation column; and / or, The insulating structure includes: a second insulating structure and a third insulating structure, wherein the second insulating structure is clamped between the solid protrusion and the clamping protrusion; The third insulating structure is located between the outer peripheral surface of the column and the hole wall of the through hole. The third insulating structure is connected to one of the second insulating structure and the first insulating portion, and abuts against the other one.

7. The cover member of the battery cell according to any one of claims 1 to 6, characterized in that: The overlapping width between the clamping protrusion and the solid protrusion is greater than or equal to 0.3 mm and less than or equal to 2 mm; and / or, The height of the protrusion is greater than or equal to 1 mm and less than or equal to 5 mm; and / or, The locking protrusion, the limiting protrusion and the column are an integrally formed part.

8. A battery cell, characterized in that: include: A housing, wherein the housing has a receiving cavity, and the receiving cavity has an open opening; a pole group, the pole group being located in the accommodating cavity; The cover member according to any one of claims 1 to 7, wherein the cover member is arranged to cover the opening.

9. A battery pack, characterized in that: include: shell, and The battery cell according to claim 8, wherein the battery cell is located in the housing.

10. An electrical device, characterized in that: include: An electricity-consuming entity and a power supply module, wherein the power supply module is electrically connected to the electricity-consuming entity to supply power to the electricity-consuming entity; Wherein, the power supply module is the battery cell according to claim 8, or the power supply module is the battery pack according to claim 9.

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