End cover assembly and manufacturing method thereof, battery monomer, battery and electric device

Abstract

The invention provides an end cover assembly and a manufacturing method thereof, a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The end cover assembly comprises an end cover, a pole, a sealing piece, a connecting piece and a first insulating piece. The end cover is provided with a lead-out hole, and the lead-out hole penetrates through the end cover in the thickness direction of the end cover. And the pole is arranged in the lead-out hole in a penetrating manner. The sealing element is sleeved on the outer side of the pole, and at least part of the sealing element is positioned in the lead-out hole. The connecting piece is positioned on one side, deviating from the interior of the battery monomer, of the end cover and is connected with the pole. At least part of the first insulating piece is arranged between the connecting piece and the end cover so as to insulate and isolate the connecting piece and the end cover. The first insulating part is connected to the end cover so as to fix the first insulating part. According to the end cover assembly, the connection stability of the first insulating part and the end cover can be improved, and the phenomenon of relative movement or separation of the first insulating part and the end cover can be relieved in the assembly process of the end cover assembly, so that the assembly efficiency and the production qualification rate of the end cover assembly can be improved.

Description

End cap assembly and manufacturing method thereof, battery cell, battery and electrical device Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an end cap assembly and a manufacturing method thereof, a battery cell, a battery, and an electrical device. Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of safety in use and service life. The battery cell of the battery is assembled into an electrode assembly (bare cell) by winding or laminating the positive electrode sheet, the negative electrode sheet and the diaphragm, which is then loaded into the shell, covered with the end cover assembly, and finally injected with the electrolyte. In the battery cell, the end cover assembly plays the role of sealing the shell, so that the shell and the end cover assembly form an enclosed space for accommodating the electrode assembly and the electrolyte. However, the assembly efficiency of the end cover assembly in the prior art is low, and the assembly quality is poor, resulting in a low production qualification rate of the end cover assembly.

[0003] Summary of the Invention

[0004] The embodiments of the present application provide an end cap assembly and a manufacturing method thereof, a battery cell, a battery, and an electrical device, which can effectively improve the assembly efficiency and production qualification rate of the end cap assembly.

[0005] In a first aspect, an embodiment of the present application provides an end cap assembly for a battery cell, the end cap assembly comprising an end cap, a pole, a seal, a connector and a first insulating member; the end cap is provided with a lead-out hole, which passes through the end cap along the thickness direction of the end cap; the pole is passed through the lead-out hole; the seal is sleeved on the outside of the pole, and at least a portion of the seal is located in the lead-out hole to seal the gap between the pole and the end cap; the connector is located on the side of the end cap away from the interior of the battery cell, and the connector connects the pole; at least a portion of the first insulating member is provided between the connector and the end cap to insulate and isolate the connector and the end cap; wherein, the first insulating member is connected to the end cap to fix the first insulating member.

[0006] In the above technical solution, the end cover is connected to the first insulating member used for insulating and isolating the connector and the end cover to fix the first insulating member on the end cover, so that the first insulating member and the end cover are fixed to each other. The end cover assembly with such a structure can, on the one hand, improve the connection stability and connection reliability between the first insulating member and the end cover, which is beneficial to improving the service life of the end cover assembly; on the other hand, it can alleviate the relative movement or separation between the first insulating member and the end cover during the production and assembly process of the end cover assembly, thereby facilitating the subsequent assembly of other components of the end cover assembly, which is beneficial to improving the assembly efficiency of the end cover assembly, and can effectively reduce the phenomenon of maintenance and rework of the end cover assembly, which is beneficial to improving the assembly quality of the end cover assembly to ensure the production qualification rate of the end cover assembly.

[0007] In some embodiments, the first insulating member is detachably connected to the end cap.

[0008] In the above technical solution, the first insulating member is connected to the end cover in a detachable connection manner to fix the first insulating member to the end cover, thereby facilitating the assembly of the first insulating member and the end cover, which helps reduce the difficulty of assembly; and facilitating the later disassembly of the first insulating member and the end cover, which helps reduce the difficulty of later maintenance or replacement.

[0009] In some embodiments, the first insulating member is snap-connected to the end cover.

[0010] In the above technical solution, the first insulating member is connected to the end cover by a snap-fitting manner, so as to fix the first insulating member on the end cover. This structure is simple and easy to manufacture.

[0011] In some embodiments, along the thickness direction of the end cover, the end cover has a first surface facing away from the interior of the battery cell, the first surface is provided with a snap-in hole, the first insulating member is protruded with a snap-in portion, and the snap-in portion is snap-fitted with the snap-in hole.

[0012] In the above technical solution, a clamping portion is provided on the first insulating member, and a clamping hole for the clamping portion of the first insulating member to be clamped into is provided on the first surface of the end cover facing the connecting member, so that the clamping portion and the clamping hole can be clamped together to achieve the clamping connection between the first insulating member and the end cover. The structure is simple and easy to implement.

[0013] In some embodiments, along the thickness direction of the end cover, the snap-fit ​​hole includes a first hole segment and a second hole segment arranged in sequence, the aperture of the first hole segment is smaller than the aperture of the second hole segment, and the first hole segment is closer to the first surface than the second hole segment; the snap-fit ​​portion has a limiting segment located in the second hole segment, and the diameter of the limiting segment is larger than the aperture of the first hole segment.

[0014] In the above technical solution, the snap-fit ​​hole has a first hole section and a second hole section arranged in sequence along the thickness direction of the end cover, the first hole section is closer to the first surface, and the aperture of the first hole section is smaller than the aperture of the second hole section. By setting the limiting section of the snap-fit ​​part inserted in the second hole section to a structure with a diameter larger than the aperture of the first hole section, that is, the snap-fit ​​part is inserted in the first hole section and the second hole section, and the diameter of the part located in the second hole section is larger than the aperture of the first hole section, so that the snap-fit ​​part and the snap-fit ​​hole form an inverted structure. The use of this structure can effectively reduce the phenomenon of the first insulating part and the end cover falling off during the subsequent assembly process of the end cover assembly, which is conducive to improving the connection stability and connection reliability between the first insulating part and the end cover.

[0015] In some embodiments, the first insulating member is bonded to the end cap via an adhesive layer.

[0016] In the above technical solution, the first insulating member is connected to the end cover by bonding to fix the first insulating member to the end cover. This structure makes the connection between the first insulating member and the end cover more stable and reliable.

[0017] In some embodiments, along a thickness direction of the end cover, the end cover has a first surface facing away from the interior of the battery cell, and the first surface is provided with a receiving groove, and the receiving groove is used to receive at least a portion of the adhesive layer.

[0018] In the above technical solution, by providing a receiving groove for accommodating the adhesive layer on the first surface of the end cover, the difficulty of providing the adhesive layer on the end cover can be reduced, and the capacity of the adhesive layer can be guaranteed so that the first insulating member and the end cover can be bonded to each other through the adhesive layer.

[0019] In some embodiments, the first insulating member is provided with a protruding butt joint portion, and at least a portion of the butt joint portion is embedded in the adhesive layer.

[0020] In the above technical solution, the first insulating part is provided with a docking portion embedded in the adhesive layer, that is, at least part of the docking portion is covered by the adhesive layer. The end cover assembly adopting this structure can increase the contact area between the first insulating part and the adhesive layer, thereby facilitating the improvement of the bonding strength between the first insulating part and the end cover, thereby improving the connection strength between the first insulating part and the end cover.

[0021] In some embodiments, at least a portion of the docking portion is located within the receiving groove.

[0022] In the above technical solution, by setting at least part of the docking portion to be located in the accommodating groove, that is, the docking portion extends into the accommodating groove, so that at least part of the docking portion is inserted into the accommodating groove, the use of this structure can further increase the contact area between the docking portion of the first insulating member and the adhesive layer accommodated in the accommodating groove, which is beneficial to improving the connection stability and connection reliability between the first insulating member and the end cover.

[0023] In some embodiments, the accommodating groove is an annular groove, and the accommodating groove is arranged around the outlet hole.

[0024] In the above technical solution, by configuring the receiving groove as an annular groove structure surrounding the outside of the lead-out hole, the receiving groove with this structure can accommodate the adhesive layer while reducing the adhesive layer from entering the lead-out hole, thereby helping to ensure the assembly quality of the end cap assembly. In addition, by configuring the receiving groove as an annular structure and surrounding the outside of the lead-out hole, the receiving groove can provide a certain barrier to the electrolyte, thereby reducing the electrolyte from entering the lead-out hole, thereby helping to reduce the risk of short circuit between the terminal and the end cap.

[0025] In some embodiments, the adhesive layer is an annular structure, and the adhesive layer is disposed around the lead-out hole.

[0026] In the above technical solution, by providing the adhesive layer in an annular structure surrounding the lead-out hole, the bonding area between the end cap and the first insulating member is increased, while the adhesive layer is less likely to enter the lead-out hole. Furthermore, while the annular adhesive layer connects the first insulating member and the end cap, the adhesive layer surrounding the outside of the lead-out hole also acts as a barrier to the electrolyte, reducing its ingress into the lead-out hole and thereby reducing the risk of a short circuit between the terminal and the end cap.

[0027] In some embodiments, along the thickness direction of the end cover, the end cover has a first surface facing away from the interior of the battery cell, and the first surface is provided with a receiving groove, the receiving groove is an annular groove, and the receiving groove is provided around the lead-out hole.

[0028] In the above technical solution, a ring-shaped receiving groove is provided on the first surface of the end cover facing away from the interior of the battery cell, and the receiving groove surrounds the outside of the lead-out hole, so that the receiving groove can contain and block the electrolyte, thereby alleviating the phenomenon of the electrolyte entering the lead-out hole, thereby helping to reduce the risk of short circuit between the pole and the end cover.

[0029] In some embodiments, the first insulating member has a protrusion extending into the lead-out hole, and the protrusion is interference-fitted with the end cover.

[0030] In the above technical solution, a protrusion extending into the lead-out hole is provided on the first insulating member, and the protrusion is interference fit with the end cover to connect the first insulating member to the end cover, thereby enabling the first insulating member to be fixed to the end cover. This structure is convenient for assembly and is conducive to improving the production efficiency of the end cover assembly.

[0031] In some embodiments, a protrusion is provided on the wall surface of the outlet hole, and the protrusion presses the protruding portion along the radial direction of the outlet hole to achieve an interference fit between the protruding portion and the end cover.

[0032] In the above technical solution, a protrusion is provided on the wall surface of the lead-out hole so that when the protrusion of the first insulating member is inserted into the lead-out hole, the protrusion can be squeezed along the radial direction of the lead-out hole, thereby achieving an interference fit between the protrusion of the first insulating member and the end cover. This structure is simple and easy to implement.

[0033] In some embodiments, a plurality of protrusions are provided on the wall surface of the outlet hole, and the plurality of protrusions are arranged at intervals along the circumference of the outlet hole.

[0034] In the above technical solution, a plurality of protrusions are arranged at intervals along the circumference of the lead-out hole on the wall surface of the lead-out hole so that the plurality of protrusions can cooperate to exert an extrusion effect on the protruding portion. This structure is beneficial to improving the connection firmness of the interference fit between the end cover and the protruding portion of the first insulating member.

[0035] In some embodiments, the protrusion is provided with a guiding slope for guiding the protruding portion into the outlet hole.

[0036] In the above technical solution, the protrusion is also provided with a guiding slope, which can play a certain guiding role on the protruding portion of the first insulating member so as to guide the protruding portion into the lead-out hole, thereby helping to reduce the difficulty of assembling the protruding portion inserted into the lead-out hole and interference fit with the end cover.

[0037] In some embodiments, the first insulating member covers a portion of the lead-out hole, and the first insulating member is configured to restrict the sealing member from being separated from the lead-out hole in a direction away from the interior of the battery cell along a thickness direction of the end cover.

[0038] In the above technical solution, by setting the first insulating member to cover the part of the lead-out hole, that is, after the first insulating member and the end cover are connected to each other, the first insulating member can block the part of the lead-out hole, thereby effectively alleviating the situation where the seal deviates or detaches from the lead-out hole during the subsequent assembly process of the end cover assembly, so as to ensure that the seal can be assembled in the lead-out hole, and further effectively reduce the phenomenon that the seal is damaged or improperly assembled during the subsequent assembly process of the end cover assembly, which is beneficial to reduce the risk of leakage of the battery cell with such an end cover assembly, so as to improve the safety and service life of the battery cell.

[0039] In some embodiments, the first insulating member includes a main body and a protrusion; along the thickness direction of the end cover, at least a portion of the main body is arranged between the connecting member and the end cover; the protrusion protrudes from the surface of the main body facing the end cover, and at least a portion of the protrusion extends into the lead-out hole, and the protrusion is configured to limit the seal from detaching from the lead-out hole along the thickness direction of the end cover in a direction away from the interior of the battery cell.

[0040] In the above technical solution, the first insulating member is provided with a main body and a protruding portion. The main body is provided between the connector and the end cover to serve as an insulator to isolate the connector and the end cover, and the protruding portion is provided on the surface of the main body facing the end cover, so that at least part of the protruding portion is located in the lead-out hole, so that the protruding portion can be used for the seal to abut against in the thickness direction of the end cover, thereby playing a better restrictive role on the seal to prevent the seal from detaching from the lead-out hole in the direction away from the interior of the battery cell in the thickness direction of the end cover, thereby reducing the risk of leakage of the battery cell due to damage or improper assembly of the seal in subsequent assembly.

[0041] In some embodiments, the protrusion is arranged around the pole.

[0042] In the above technical solution, by setting the protrusion as an annular structure extending along the circumference of the lead-out hole, and the protrusion surrounding the outside of the pole, the first insulating member adopting this structure can, on the one hand, play a better insulating isolation role between the pole and the hole wall of the lead-out hole through the protrusion, so as to reduce the risk of short circuit between the pole and the hole wall of the lead-out hole; on the other hand, the protrusion of the annular structure can play a better limiting role on the seal sleeved on the outside of the pole, so as to alleviate the phenomenon that the seal appears to be separated from the lead-out hole in the direction away from the interior of the battery cell in the thickness direction of the end cover.

[0043] In some embodiments, the main body and the protrusion are an integrally formed structure.

[0044] In the above technical solution, the first insulating member with the main body and the protruding portion as an integrated structure is easy to manufacture, which helps to reduce the manufacturing difficulty, and is easy to assemble the first insulating member to the end cover, which helps to reduce the assembly difficulty of the end cover assembly.

[0045] In some embodiments, the end cover assembly further includes a current collecting member and a second insulating member; the current collecting member is arranged on the side of the end cover facing the interior of the battery cell, and the current collecting member is connected to the pole, and the current collecting member is used to be electrically connected to the electrode assembly; the second insulating member is arranged between the current collecting member and the end cover to insulate and isolate the current collecting member and the end cover.

[0046] In this technical solution, a current collecting member is provided on the side of the end cap facing the interior of the battery cell. This current collecting member connects the terminal post to the electrode assembly, thereby achieving electrical connection between the electrode assembly and the terminal post. This structure is simple and easy to assemble. Furthermore, a second insulating member is provided between the current collecting member and the end cap, providing insulation and isolation between the two, thereby reducing the risk of short circuits in battery cells equipped with this end cap assembly.

[0047] In a second aspect, an embodiment of the present application further provides a battery cell comprising a shell, an electrode assembly and the above-mentioned end cover assembly; the shell has an opening; the electrode assembly is accommodated in the shell; the end cover covers the opening, and the first insulating member is arranged on the side of the end cover facing away from the electrode assembly.

[0048] In a third aspect, an embodiment of the present application further provides a battery comprising the above-mentioned battery cell.

[0049] In a fourth aspect, an embodiment of the present application further provides an electrical device comprising the above-mentioned battery cell.

[0050] In a fifth aspect, an embodiment of the present application also provides a method for manufacturing an end cover assembly, comprising: providing an end cover, a pole, a seal and a first insulating member, the end cover being provided with an outlet hole, and the outlet hole passing through the end cover along the thickness direction of the end cover; connecting the first insulating member to the end cover to fix the first insulating member to one side of the end cover in the thickness direction of the end cover; sleeved on the outside of the pole; passing the pole through the end cover and the first insulating member in sequence, so that at least part of the seal is located in the outlet hole; wherein the first insulating member is configured to limit the seal from detaching from the outlet hole along the thickness direction of the end cover in a direction away from the interior of the battery cell.

[0051] In the above technical solution, the manufacturing method of the end cover assembly is to first connect the first insulating part and the end cover to each other, so that the first insulating part and the end cover are fixed to each other, and then the pole with the seal is inserted into the lead-out hole of the end cover. That is to say, the first insulating part and the end cover are pre-assembled and fixed to each other before the pole and other components such as the seal are assembled. This assembly method can better restrict the seal through the first insulating part, so that the seal will be blocked by the first insulating part when the pole passes through the end cover and the first insulating part, thereby alleviating the situation where the seal deviates or detaches from the lead-out hole in the direction away from the interior of the battery cell in the thickness direction of the end cover, so as to reduce the phenomenon that the seal is damaged or not assembled in place during the subsequent assembly process of the end cover assembly, which is beneficial to reduce the risk of leakage of the battery cell with such an end cover assembly, so as to improve the safety and service life of the battery cell.

[0052] In some embodiments, the manufacturing method of the end cap assembly further includes: providing a current collecting component and a second insulating component; before the seal is sleeved on the outside of the pole, the manufacturing method of the end cap assembly further includes: passing the pole through the current collecting component and the second insulating component in sequence.

[0053] In the above technical solution, the assembly method of the end cover assembly also includes first passing the pole through the current collecting member and the second insulating member before the seal is sleeved on the outside of the pole, and then sleeved on the outside of the pole, and finally assembling the pole assembled with the current collecting member, the second insulating member and the seal into the lead-out hole of the end cover to assemble the second insulating member and the current collecting member to the end cover. This assembly method has low assembly difficulty and high assembly efficiency.

[0054] In some embodiments, the manufacturing method of the end cover assembly further includes: providing a connecting piece; after the pole is passed through the end cover and the first insulating piece in sequence, the manufacturing method of the end cover assembly further includes: connecting the connecting piece to the pole so that at least a portion of the first insulating piece is disposed between the connecting piece and the end cover.

[0055] In the above technical solution, the assembly method of the end cover assembly also includes connecting the connector to the pole after the pole passes through the end cover and the first insulating member, thereby enabling the pole and other components to be fastened to the end cover, and further fastening the first insulating member to the end cover to ensure the structural stability of the end cover assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0057] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0058] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0059] FIG3 is an exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0060] FIG4 is a schematic structural diagram of an end cap assembly provided in some embodiments of the present application;

[0061] FIG5 is an exploded view of the structure of an end cap assembly provided in some embodiments of the present application;

[0062] FIG6 is a cross-sectional view of an end cap assembly provided in some embodiments of the present application;

[0063] FIG7 is a partial enlarged view of point A of the end cap assembly shown in FIG6;

[0064] FIG8 is a schematic structural diagram of a first insulating member of an end cap assembly provided in some embodiments of the present application;

[0065] FIG9 is a schematic structural diagram of an end cap of an end cap assembly provided in some embodiments of the present application;

[0066] FIG10 is a schematic diagram illustrating the connection between the first insulating member and the end cap of the end cap assembly provided in some embodiments of the present application;

[0067] FIG11 is a cross-sectional view of an end cap assembly provided in yet other embodiments of the present application;

[0068] FIG12 is a partial enlarged view of point B of the end cap assembly shown in FIG11;

[0069] FIG13 is a cross-sectional view of an end cap assembly provided in some other embodiments of the present application;

[0070] FIG14 is a partial enlarged view of the end cap assembly shown in FIG13 at C;

[0071] FIG15 is a schematic structural diagram of an end cap of an end cap assembly provided in other embodiments of the present application;

[0072] FIG16 is a cross-sectional view of an end cap assembly provided in some further embodiments of the present application;

[0073] FIG17 is a partial enlarged view of a portion D of the end cap assembly shown in FIG16;

[0074] FIG18 is a schematic structural diagram of an end cap of an end cap assembly provided in some further embodiments of the present application;

[0075] FIG19 is a cross-sectional view of an end cap of an end cap assembly provided in some further embodiments of the present application;

[0076] FIG20 is a partial enlarged view of the end cap at position E shown in FIG19;

[0077] FIG21 is a schematic flow chart of a method for manufacturing an end cap assembly according to some embodiments of the present application;

[0078] FIG22 is a schematic diagram of the connection between the end cap and the first insulating member provided in some embodiments of the present application;

[0079] FIG23 is a schematic flow chart of a method for manufacturing an end cap assembly according to yet other embodiments of the present application;

[0080] FIG24 is a schematic diagram showing the connection between a pole, a second insulating member, and a current collecting member according to some embodiments of the present application;

[0081] FIG25 is a schematic flow chart of a method for manufacturing an end cap assembly provided in some further embodiments of the present application.

[0082] Icons: 1000 - vehicle; 100 - battery; 10 - housing; 11 - first housing body; 12 - second housing body; 20 - battery cell; 21 - housing; 211 - opening; 22 - electrode assembly; 221 - tab; 23 - end cap assembly; 231 - end cap; 2311 - lead-out hole; 2312 - first surface; 2313 - snap-fit ​​hole; 2313a - first hole section; 2313b - second hole section; 2314 - receiving groove; 2315 - protrusion; 2315a-guide slope; 232-pole; 233-seal; 234-connector; 235-first insulating member; 2351-main body; 2352-protrusion; 2353-clamping portion; 2353a-limiting section; 2353b-connecting section; 2354-docking portion; 236-pressure relief member; 237-adhesive layer; 238-current collecting component; 239-second insulating member; 200-controller; 300-motor; X-thickness direction of the end cover. DETAILED DESCRIPTION

[0083] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0084] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0085] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0086] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0087] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0088] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0089] The term "plurality" used in this application refers to two or more (including two).

[0090] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0091] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a housing that encloses one or more battery cells or multiple battery modules. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0092] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The portion of the positive electrode collector not coated with the positive active material layer serves as the positive tab, allowing power to be input or output from the positive electrode sheet. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The portion of the negative electrode collector not coated with the negative active material layer serves as the negative tab, allowing power to be input or output from the negative electrode sheet. The negative electrode current collector can be made of copper, and the negative active material can be carbon or silicon, among others. In order to ensure that large currents can pass without melting, there are multiple positive electrode tabs and they are stacked together, and there are multiple negative electrode tabs and they are stacked together.

[0093] The material of the isolation film may be polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the present invention is not limited thereto.

[0094] Batteries offer outstanding advantages, including high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are a crucial component of today's new energy development. A battery cell is assembled from a positive electrode sheet, a negative electrode sheet, and a separator through winding or lamination, forming an electrode assembly (bare cell). This is then enclosed in a housing, capped with an end cap assembly, and finally injected with electrolyte.

[0095] The inventors discovered that for a typical battery cell, the end cap assembly typically consists of an end cap, a terminal, an upper plastic, a lower plastic, and a rivet block. The end cap is provided with an outlet hole, through which the terminal is inserted. The upper plastic and lower plastic are respectively provided on either side of the end cap to insulate and isolate the terminal from the end cap. The rivet block is riveted to the terminal to secure the terminal, upper plastic, and lower plastic to the end cap, thereby enabling the input and output of electrical energy from the battery cell via the terminal. However, this end cap assembly structure, in which the upper plastic and the terminal are secured via the rivet block, is prone to relative movement or separation between the upper plastic and the end cap during the production and assembly of the end cap assembly. This, on the one hand, hinders the subsequent assembly of other components of the end cap assembly, resulting in low assembly efficiency. On the other hand, it makes the end cap assembly prone to repair and rework, resulting in poor assembly quality and hindering the production yield of the end cap assembly.

[0096] Based on the above considerations, in order to solve the problems of low assembly efficiency and production qualification rate of battery cells, the inventors have designed an end cover assembly after in-depth research. The end cover assembly includes an end cover, a pole, a seal, a connector and a first insulating member. The end cover is provided with a lead-out hole, and the lead-out hole passes through the end cover along the thickness direction of the end cover. The pole is inserted into the lead-out hole, the seal is sleeved on the outside of the pole, and at least part of the seal is located in the lead-out hole to seal the gap between the pole and the end cover. The connector is located on the side of the end cover away from the interior of the battery cell, and the connector connects the pole. At least part of the first insulating member is arranged between the connector and the end cover to insulate and isolate the connector and the end cover, and the first insulating member is connected to the end cover to fix the first insulating member.

[0097] In an end cover assembly of this structure, the end cover is connected to a first insulating member used for insulating and isolating the connector and the end cover to fix the first insulating member to the end cover, so that the first insulating member and the end cover are fixed to each other. The end cover assembly with this structure can, on the one hand, improve the connection stability and connection reliability between the first insulating member and the end cover, which is beneficial to improving the service life of the end cover assembly; on the other hand, it can alleviate the relative movement or separation between the first insulating member and the end cover during the production and assembly process of the end cover assembly, thereby facilitating the subsequent assembly of other components of the end cover assembly, which is beneficial to improving the assembly efficiency of the end cover assembly, and can effectively reduce the phenomenon of maintenance and rework of the end cover assembly, which is beneficial to improving the assembly quality of the end cover assembly to ensure the production qualification rate of the end cover assembly.

[0098] The end cap assembly disclosed in the embodiments of this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in this application can be used to form the electrical device. This helps mitigate relative movement or separation between the upper plastic portion of the end cap assembly and the end cap during production and assembly, thereby improving assembly efficiency and production yield of the end cap assembly.

[0099] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0100] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0101] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0102] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0103] Please refer to Figure 2, which is an exploded view of the structure of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, which is used to be accommodated in the housing 10. The housing 10 is used to provide an assembly space for the battery cell 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 can include a first housing body 11 and a second housing body 12, which cover each other and together define an assembly space for accommodating the battery cell 20. The second housing body 12 can be a hollow structure with one end open, and the first housing body 11 can be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define an assembly space; the first housing body 11 and the second housing body 12 can also be hollow structures with one end open, with the open side of the first housing body 11 covering the open side of the second housing body 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0104] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0105] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be cylindrical, flat, rectangular, or in other shapes. For example, in FIG2 , the battery cell 20 is cylindrical.

[0106] Please refer to Figure 3, which is an exploded view of the structure of a battery cell 20 provided in some embodiments of the present application. The battery cell 20 includes a housing 21, an electrode assembly 22, and an end cap assembly 23. The housing 21 has an opening 211, and the electrode assembly 22 is accommodated within the housing 21. The end cap assembly 23 covers the opening 211 and is electrically connected to the electrode assembly 22 to enable the input and output of electrical energy from the battery cell 20.

[0107] The housing 21 can also be used to contain an electrolyte, such as an electrolyte solution. The housing 21 can have various structural forms. The housing 21 can also be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloys.

[0108] For example, in FIG3 , the housing 21 is a hollow structure with two opposing openings 211. The battery cell 20 includes two end cap assemblies 23. One end cap assembly 23 is fitted over one opening 211 of the housing 21 and forms a sealed connection, thereby creating a sealed space for accommodating the electrode assembly 22 and the electrolyte. When assembling the battery cell 20, the electrode assembly 22 can be placed into the housing 21 first. Then, one end cap assembly 23 is fitted over one opening 211 of the housing 21, and the housing 21 is filled with electrolyte. Finally, the other end cap assembly 23 is fitted over the other opening 211 of the housing 21 to complete the assembly of the battery cell 20.

[0109] It is understandable that the battery cell 20 is not limited to the above structure. The battery cell 20 can also have other structures. For example, the shell 21 is a hollow structure with an opening 211 on one side, and the end cover assembly 23 covers the opening 211 of the shell 21 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0110] The shell 21 can also be in various shapes, such as a cylinder, a cuboid, etc. The shape of the shell 21 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, a shell 21 with a cylindrical structure can be selected; if the electrode assembly 22 is a cuboid structure, a shell 21 with a cuboid structure can be selected. Of course, the end cap assembly 23 can also be in various structures. The shape of the end cap assembly 23 can be adapted to the shape of the shell 21, for example, the end cap assembly 23 is a plate-like structure, a hollow structure with an opening 211 at one end, etc. For example, in Figure 3, the electrode assembly 22 is a cylindrical structure, and the shell 21 is a cylindrical structure, and the end cap assembly 23 covers the opening 211 of the shell 21.

[0111] The end cap assembly 23 is a component that covers the opening 211 of the housing 21 to isolate the internal environment of the battery cell 20 from the external environment.

[0112] It should be noted that the electrode assembly 22 is the component in the battery cell 20 where the electrochemical reaction occurs. The electrode assembly 22 may include a positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly 22 may be a wound structure formed by winding the positive electrode sheet, the separator, and the negative electrode sheet, or a stacked structure formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet. For example, in Figure 3, the electrode assembly 22 is a wound structure formed by winding the positive electrode sheet, the separator, and the negative electrode sheet.

[0113] As shown in FIG3 , electrode assembly 22 is formed with tabs 221 at both ends, i.e., tabs 221 are formed at both ends of electrode assembly 22 facing end cap assembly 23. Tabs 221 are used to electrically connect to end cap assembly 23, thereby achieving electrical connection between electrode assembly 22 and end cap assembly 23, thereby enabling the input or output of electrical energy from battery cell 20. The two tabs 221 are used to output the positive and negative electrodes of electrode assembly 22, respectively. Correspondingly, the two end cap assemblies 23 also serve as the positive and negative output electrodes of battery cell 20, respectively. It should be noted that the tabs 221 of electrode assembly 22 can be directly connected to end cap assembly 23, for example, by welding or abutting the tabs 221. Alternatively, the tabs 221 of electrode assembly 22 can be indirectly connected to end cap assembly 23, for example, by welding or abutting the tabs 221 to other components before being connected to end cap assembly 23.

[0114] Optionally, there may be one or more electrode assemblies 22 housed in the housing 21. For example, in FIG3 , there is only one electrode assembly 22.

[0115] According to some embodiments of the present application, referring to FIG. 3 and further to FIG. 4-7 , FIG. 4 is a schematic structural diagram of an end cap assembly 23 provided in some embodiments of the present application, FIG. 5 is an exploded structural diagram of the end cap assembly 23 provided in some embodiments of the present application, FIG. 6 is a cross-sectional view of the end cap assembly 23 provided in some embodiments of the present application, and FIG. 7 is a partial enlarged view of point A of the end cap assembly 23 shown in FIG. The present application provides an end cap assembly 23, comprising an end cap 231, a terminal 232, a seal 233, a connector 234, and a first insulating member 235. The end cap 231 is provided with an outlet hole 2311 extending through the end cap 231 along its thickness direction X. The terminal 232 is disposed within the outlet hole 2311. The seal 233 is disposed over the outside of the terminal 232, with at least a portion of the seal 233 located within the outlet hole 2311 to seal the gap between the terminal 232 and the end cap 231. Connector 234 is located on the side of end cap 231 facing away from the interior of battery cell 20 and is connected to terminal 232. At least a portion of first insulating member 235 is disposed between connector 234 and end cap 231 to insulate connector 234 from end cap 231. First insulating member 235 is connected to end cap 231 to secure first insulating member 235.

[0116] The end cap 231 covers the opening 211 of the housing 21, thereby forming a sealed space between the end cap 231 and the housing 21 for accommodating the electrode assembly 22 and the electrolyte. The lead-out hole 2311 on the end cap 231 is used to mount the electrode post 232. The lead-out hole 2311 extends through both sides of the end cap 231 in the thickness direction X of the end cap, allowing the electrode post 232 to be inserted into the lead-out hole 2311. The end cap 231 can be made of a variety of materials, such as copper, iron, aluminum, steel, and aluminum alloys.

[0117] The pole 232 serves to output or input electrical energy of the battery cell 20. Along the thickness direction X of the end cover, lead-out holes 2311 extend from both ends of the pole 232. The end of the pole 232 facing the interior of the battery cell 20 is used to be connected to the pole ear 221 of the electrode assembly 22 to achieve electrical connection between the pole 232 and the electrode assembly 22. The end of the pole 232 facing away from the interior of the battery cell 20 serves as the output pole of the battery cell 20.

[0118] For example, in Figures 5 and 6, there are two poles 232, and correspondingly, there are two lead-out holes 2311 and two seals 233 on the end cap 231. Each pole 232 is disposed within one lead-out hole 2311, and each seal 233 is sleeved on the outside of one pole 232. Both poles 232 are used to electrically connect to the tabs 221 of the electrode assembly 22 to serve as the positive output pole or negative output pole of the battery cell 20. Of course, in other embodiments, the number of poles 232 can also be one, three, or four, etc., and correspondingly, the lead-out holes 2311 and the seals 233 are provided in a one-to-one correspondence with the poles 232.

[0119] The seal 233 is sleeved on the outside of the pole 232, and at least part of the seal 233 is located in the lead-out hole 2311, that is, the seal 233 surrounds the outside of the pole 232, and the seal 233 can be located entirely in the lead-out hole 2311, or partially in the lead-out hole 2311. For example, in Figure 7, the seal 233 is located entirely in the lead-out hole 2311 to seal the gap between the pole 232 and the wall of the lead-out hole 2311, thereby reducing the risk of electrolyte leakage in the battery cell 20.

[0120] For example, in FIG. 7 , the sealing member 233 is a sealing ring, and the material of the sealing member 233 may be rubber, silicone, or nylon.

[0121] The connector 234 is used to connect the pole 232 to secure the pole 232 and other components to the end cap 231. Exemplarily, the connector 234 is a rivet block. In FIG6 , the connector 234 and both poles 232 are riveted to each other, thereby fastening the pole 232 and the first insulating member 235 to the end cap 231.

[0122] At least a portion of the first insulating member 235 is disposed between the connector 234 and the end cap 231. That is, the first insulating member 235 includes a portion disposed between the connector 234 and the end cap 231, thereby providing insulation and isolation between the end cap 231 and the connector 234, thereby reducing the risk of short circuits between the end cap 231 and the connector 234. For example, in Figures 6 and 7, the first insulating member 235 includes a body 2351 disposed between the end cap 231 and the connector 234 along the thickness direction X of the end cap, and a protrusion 2352 protruding from the body 2351. The body 2351 is used to separate the end cap 231 and the connector 234, thereby insulating the end cap 231 and the connector 234. At least a portion of the protrusion 2352 extends into the lead-out hole 2311 and is located between the pole 232 and the wall of the lead-out hole 2311, thereby providing insulation and isolation between the pole 232 and the end cap 231.

[0123] The first insulating member 235 is connected to the end cover 231 . The first insulating member 235 and the end cover 231 can be connected in various ways, such as bonding, snap-fitting, or interference fit.

[0124] Exemplarily, the first insulating member 235 can be made of various materials, such as plastic, rubber, or silicone.

[0125] In some embodiments, referring to Figures 4 and 5 , the end cap assembly 23 further includes a pressure relief member 236 mounted on the end cap 231. The pressure relief member 236 is configured to release the internal pressure of the battery cell 20. The pressure relief member 236 serves to release the internal pressure of the battery cell 20 in the event of thermal runaway of the battery cell 20. The pressure relief member 236 can have various structures. For example, the pressure relief member 236 can be a component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve, or a safety valve.

[0126] By interconnecting the end cover 231 with the first insulating member 235 for insulating and isolating the connector 234 and the end cover 231, the first insulating member 235 is fixed to the end cover 231, so that the first insulating member 235 and the end cover 231 are a mutually fixed structure. The end cover assembly 23 adopting this structure can, on the one hand, improve the connection stability and connection reliability between the first insulating member 235 and the end cover 231, which is beneficial to improving the service life of the end cover assembly 23; on the other hand, during the production and assembly process of the end cover assembly 23, it can alleviate the relative movement or separation between the first insulating member 235 and the end cover 231, thereby facilitating the subsequent assembly of other components of the end cover assembly 23, which is beneficial to improving the assembly efficiency of the end cover assembly 23, and can effectively reduce the phenomenon of maintenance and rework of the end cover assembly 23, which is beneficial to improving the assembly quality of the end cover assembly 23 to ensure the production qualification rate of the end cover assembly 23.

[0127] According to some embodiments of the present application, the first insulating member 235 is detachably connected to the end cover 231 .

[0128] The first insulating member 235 may be detachably connected to the end cover 231 in various ways, such as snap connection, bolt connection, or buckle connection.

[0129] The first insulating member 235 is connected to the end cover 231 in a detachable connection manner to fix the first insulating member 235 to the end cover 231. This makes it easy to assemble the first insulating member 235 and the end cover 231, which helps reduce the difficulty of assembly. On the other hand, it makes it easy to disassemble the first insulating member 235 and the end cover 231 at a later time, which helps reduce the difficulty of later maintenance or replacement.

[0130] According to some embodiments of the present application, the first insulating member 235 is snap-connected to the end cover 231 .

[0131] The first insulating member 235 is connected to the end cover 231 by snapping, so as to fix the first insulating member 235 on the end cover 231. This structure is simple and easy to manufacture.

[0132] In some embodiments, referring to Figures 6 and 7, and further referring to Figures 8 and 9, Figure 8 is a schematic structural diagram of the first insulating member 235 of the end cap assembly 23 provided in some embodiments of the present application, and Figure 9 is a schematic structural diagram of the end cap 231 of the end cap assembly 23 provided in some embodiments of the present application. Along the thickness direction X of the end cap, the end cap 231 has a first surface 2312 facing away from the interior of the battery cell 20. The first surface 2312 is provided with a snap-fitting hole 2313. The first insulating member 235 is provided with a protruding snap-fitting portion 2353, which snap-fits with the snap-fitting hole 2313.

[0133] The clamping portion 2353 protruding from the first insulating member 235 is inserted into the clamping hole 2313 provided on the first surface 2312 of the end cover 231 to achieve clamping fit between the clamping portion 2353 and the clamping hole 2313 .

[0134] Illustratively, the clamping portion 2353 is protruded from the surface of the main body 2351 of the first insulating member 235 facing the end cover 231 .

[0135] It should be noted that, in some embodiments, the snap-fit ​​portion 2353 may also be protruded from the first surface 2312 of the end cover 231. Correspondingly, a snap-fit ​​hole 2313 is provided on the surface of the main body 2351 of the first insulating member 235 facing the end cover 231. The snap-fit ​​between the snap-fit ​​portion 2353 and the snap-fit ​​hole 2313 can be achieved.

[0136] By providing a snap-fit ​​portion 2353 on the first insulating member 235 and providing a snap-fit ​​hole 2313 on the first surface 2312 of the end cover 231 facing the connecting member 234 for the snap-fit ​​portion 2353 of the first insulating member 235 to snap into, the snap-fit ​​between the first insulating member 235 and the end cover 231 can be achieved through the structure in which the snap-fit ​​portion 2353 and the snap-fit ​​hole 2313 snap into each other. The structure is simple and easy to implement.

[0137] According to some embodiments of the present application, referring to Figures 8 and 9, and further referring to Figure 10, Figure 10 is a schematic diagram illustrating the connection between the first insulating member 235 and the end cap 231 of the end cap assembly 23 provided in some embodiments of the present application. Along the thickness direction X of the end cap, the engaging hole 2313 includes a first hole segment 2313a and a second hole segment 2313b arranged in sequence. The aperture of the first hole segment 2313a is smaller than the aperture of the second hole segment 2313b, and the first hole segment 2313a is closer to the first surface 2312 than the second hole segment 2313b. The engaging portion 2353 includes a retaining segment 2353a located within the second hole segment 2313b. The diameter of the retaining segment 2353a is larger than the aperture of the first hole segment 2313a.

[0138] Among them, the first hole section 2313a is closer to the first surface 2312 than the second hole section 2313b, that is, the second hole section 2313b is on the side of the first hole section 2313a away from the first surface 2312, and the first hole section 2313a passes through the first surface 2312 of the end cover 231, and the first hole section 2313a and the second hole section 2313b are both used for the insertion of the clamping portion 2353.

[0139] The clamping portion 2353 has a limiting section 2353a located in the second hole section 2313b, and the diameter of the limiting section 2353a is larger than the aperture of the first hole section 2313a, that is, the clamping portion 2353 has a limiting section 2353a that passes through the first hole section 2313a and is inserted into the second hole section 2313b, and the diameter of the limiting section 2353a is larger than the aperture of the first hole section 2313a, so that the limiting section 2353a will be blocked by the hole wall surface of the first hole section 2313a to limit the limiting section 2353a from separating from the second hole section 2313b.

[0140] In FIG. 10 , the engaging portion 2353 further includes a connecting segment 2353 b connected between the limiting segment 2353 a and the main body 2351 of the first insulating member 235 , and at least a portion of the connecting segment 2353 b is located in the first hole segment 2313 a .

[0141] The clamping hole 2313 has a first hole section 2313a and a second hole section 2313b arranged in sequence along the thickness direction X of the end cover. The first hole section 2313a is closer to the first surface 2312, and the aperture of the first hole section 2313a is smaller than the aperture of the second hole section 2313b. By inserting the clamping portion 2353 into the second hole section 2313b, the limiting section 2353a is set to have a diameter larger than the aperture of the first hole section 2313a. That is, the clamping portion 2353 is inserted into the first hole section 2313b. The diameter of the portion located in the hole section 2313a and the second hole section 2313b is larger than the aperture of the first hole section 2313a, so that the clamping portion 2353 and the clamping hole 2313 form an inverted structure. The use of this structure can effectively reduce the phenomenon of the first insulating member 235 and the end cover 231 falling off during the subsequent assembly process of the end cover assembly 23, thereby helping to improve the connection stability and connection reliability between the first insulating member 235 and the end cover 231.

[0142] According to some embodiments of the present application, referring to Figures 11 and 12, Figure 11 is a cross-sectional view of an end cap assembly 23 provided in some other embodiments of the present application, and Figure 12 is a partial enlarged view of point B of the end cap assembly 23 shown in Figure 11. A first insulating member 235 is bonded to the end cap 231 via an adhesive layer 237.

[0143] The adhesive layer 237 serves to bond the end cap 231 and the first insulating member 235. The adhesive layer 237 can have various structures. For example, the adhesive layer 237 can be glue or double-sided tape disposed between the end cap 231 and the first insulating member 235. Of course, the adhesive layer 237 can also be the portion of the first insulating member 235 that is bonded to the end cap 231 after partial melting. That is, the portion of the first insulating member 235 that is bonded to the end cap 231 after melting is the adhesive layer 237. For example, in FIG12 , the adhesive layer 237 is glue disposed between the end cap 231 and the first insulating member 235 along the thickness direction X of the end cap.

[0144] The first insulating member 235 is connected to the end cover 231 by bonding, so as to fix the first insulating member 235 on the end cover 231. This structure makes the connection between the first insulating member 235 and the end cover 231 more stable and reliable.

[0145] According to some embodiments of the present application, referring to Figures 13, 14, and 15, Figure 13 is a cross-sectional view of an end cap assembly 23 provided in other embodiments of the present application, Figure 14 is a partial enlarged view of a portion C of the end cap assembly 23 shown in Figure 13, and Figure 15 is a schematic structural diagram of an end cap 231 of the end cap assembly 23 provided in other embodiments of the present application. Along the thickness direction X of the end cap, the end cap 231 has a first surface 2312 facing away from the interior of the battery cell 20. The first surface 2312 is provided with a receiving groove 2314, which is used to accommodate at least a portion of the adhesive layer 237.

[0146] The receiving groove 2314 serves to receive the adhesive layer 237, facilitating the provision of the adhesive layer 237 on the end cap 231. The receiving groove 2314 is configured to receive at least a portion of the adhesive layer 237. Specifically, the adhesive layer 237 may be entirely received within the receiving groove 2314, or only a portion of the adhesive layer 237 may be received within the receiving groove 2314. In other words, the adhesive layer 237 may extend beyond the first surface 2312 in the thickness direction X of the end cap.

[0147] It should be noted that, in some embodiments, the accommodating groove 2314 may not be provided on the first surface 2312 of the end cover 231, and the adhesive layer 237 is provided between the main body 2351 of the first insulating member 235 and the first surface 2312 of the end cover 231 in the thickness direction X of the end cover to achieve bonding between the end cover 231 and the first insulating member 235.

[0148] By setting a receiving groove 2314 for accommodating the adhesive layer 237 on the first surface 2312 of the end cover 231, the difficulty of setting the adhesive layer 237 on the end cover 231 can be reduced, and the capacity of the adhesive layer 237 can be guaranteed, so that the first insulating member 235 can be bonded to the end cover 231 through the adhesive layer 237.

[0149] In some embodiments, as shown in FIG. 14 , the first insulating member 235 is provided with a protruding docking portion 2354 , and at least a portion of the docking portion 2354 is embedded in the adhesive layer 237 .

[0150] The docking portion 2354 is protruded from the surface of the main body 2351 of the first insulating member 235 facing the end cover 231 .

[0151] At least a portion of the docking portion 2354 is embedded in the adhesive layer 237 , that is, the docking portion 2354 has a portion extending into the adhesive layer 237 , so that the portion of the docking portion 2354 is covered by the adhesive layer 237 .

[0152] In the above technical solution, the first insulating member 235 is provided with a docking portion 2354 embedded in the adhesive layer 237. The end cover assembly 23 using this structure can increase the contact area between the first insulating member 235 and the adhesive layer 237, thereby facilitating the improvement of the bonding strength between the first insulating member 235 and the end cover 231, thereby improving the connection strength between the first insulating member 235 and the end cover 231.

[0153] In some embodiments, please continue to refer to FIG. 14 , at least a portion of the docking portion 2354 is located within the receiving groove 2314 .

[0154] At least a portion of the docking portion 2354 is located in the receiving groove 2314 , that is, the docking portion 2354 has a portion extending into the receiving groove 2314 along the thickness direction X of the end cover.

[0155] By setting at least a portion of the docking portion 2354 to be located in the accommodating groove 2314, at least a portion of the docking portion 2354 is inserted into the accommodating groove 2314. This structure can further increase the contact area between the docking portion 2354 of the first insulating member 235 and the adhesive layer 237 accommodated in the accommodating groove 2314, which is beneficial to improving the connection stability and connection reliability between the first insulating member 235 and the end cover 231.

[0156] According to some embodiments of the present application, referring to FIG. 14 and FIG. 15 , the accommodating groove 2314 is an annular groove, and the accommodating groove 2314 is arranged around the outlet hole 2311 .

[0157] The accommodating groove 2314 is an annular groove, that is, the accommodating groove 2314 is an annular structure that ends in its extension direction and is connected to each other to form a closed loop.

[0158] The receiving groove 2314 is disposed around the lead-out hole 2311, that is, the receiving groove 2314 is disposed around the outside of the lead-out hole 2311, that is, the receiving groove 2314 is disposed around the outside of the pole 232. For example, in FIG15 , there are two lead-out holes 2311 and two poles 232, and correspondingly, the receiving groove 2314 is disposed around the outside of both lead-out holes 2311. Of course, in some embodiments, there may be multiple receiving grooves 2314 disposed on the first surface 2312 of the end cap 231, each of which is disposed around one lead-out hole 2311.

[0159] Illustratively, the docking portion 2354 provided on the first insulating member 235 is also an annular structure extending along the extension direction of the receiving groove 2314. Of course, in other embodiments, the docking portion 2354 may also be a structure that is discontinuous in the extension direction of the receiving groove 2314, that is, the first insulating member 235 is provided with a plurality of docking portions 2354, and the plurality of docking portions 2354 are arranged at intervals along the extension direction of the receiving groove 2314.

[0160] By configuring the receiving groove 2314 as an annular groove structure surrounding the outside of the lead-out hole 2311, the receiving groove 2314 with such a structure can accommodate the adhesive layer 237 while reducing the possibility of the adhesive layer 237 entering the lead-out hole 2311, thereby facilitating the assembly quality of the end cap assembly 23. Furthermore, by configuring the receiving groove 2314 as an annular structure and surrounding the outside of the lead-out hole 2311, the receiving groove 2314 can provide a certain barrier to the electrolyte, thereby reducing the possibility of the electrolyte entering the lead-out hole 2311, thereby facilitating the reduction of the risk of a short circuit between the terminal 232 and the end cap 231.

[0161] According to some embodiments of the present application, the adhesive layer 237 is a ring-shaped structure, and the adhesive layer 237 is disposed around the lead-out hole 2311 .

[0162] Among them, in the embodiment in which an annular accommodating groove 2314 is provided on the first surface 2312 of the end cover 231, the adhesive layer 237 can also be an annular structure extending along the extension direction of the accommodating groove 2314. Similarly, in the embodiment in which the accommodating groove 2314 is not provided on the first surface 2312 of the end cover 231 (see Figures 11 and 12), the adhesive layer 237 can also be an annular structure provided on the first surface 2312, and the adhesive layer 237 surrounds the outside of the lead-out hole 2311.

[0163] By providing the adhesive layer 237 with an annular structure surrounding the lead-out hole 2311, the bonding area between the end cap 231 and the first insulating member 235 can be increased, and the intrusion of the adhesive layer 237 into the lead-out hole 2311 can be reduced. Furthermore, while the annular adhesive layer 237 connects the first insulating member 235 and the end cap 231, the adhesive layer 237 surrounding the outside of the lead-out hole 2311 can also provide a barrier to the electrolyte, thereby reducing the intrusion of the electrolyte into the lead-out hole 2311, thereby reducing the risk of a short circuit between the terminal 232 and the end cap 231.

[0164] In some embodiments, as shown in Figure 15, along the thickness direction X of the end cover, the end cover 231 has a first surface 2312 facing away from the interior of the battery cell 20, and the first surface 2312 is provided with a receiving groove 2314, which is an annular groove and is arranged around the lead-out hole 2311.

[0165] Among them, the accommodating groove 2314 is an annular groove, and the accommodating groove 2314 is arranged around the outlet hole 2311, that is, the accommodating groove 2314 is an annular structure that ends and is connected to each other in its extension direction to form a closed loop, and the accommodating groove 2314 surrounds the outside of the outlet hole 2311.

[0166] 15 , there are two outlet holes 2311, and correspondingly, the receiving groove 2314 surrounds the outside of the two outlet holes 2311. Of course, in some embodiments, there may be multiple receiving grooves 2314 provided on the first surface 2312 of the end cap 231, with each receiving groove 2314 being provided around one outlet hole 2311.

[0167] By setting a ring-shaped receiving groove 2314 on the first surface 2312 of the end cover 231 away from the inside of the battery cell 20, and the receiving groove 2314 surrounding the outside of the lead-out hole 2311, the receiving groove 2314 can contain and block the electrolyte, thereby alleviating the phenomenon of the electrolyte entering the lead-out hole 2311, thereby helping to reduce the risk of short circuit between the pole 232 and the end cover 231.

[0168] According to some embodiments of the present application, referring to Figures 16 and 17, Figure 16 is a cross-sectional view of an end cap assembly 23 provided in still further embodiments of the present application, and Figure 17 is a partial enlarged view of a portion D of the end cap assembly 23 shown in Figure 16. The first insulating member 235 has a protrusion 2352 extending into the lead-out hole 2311, and the protrusion 2352 is interference-fitted with the end cap 231.

[0169] Among them, the protrusion 2352 is interference fit with the end cover 231, that is, there is an assembly tolerance between the protrusion 2352 and the end cover 231, so that the part of the protrusion 2352 inserted into the lead-out hole 2311 of the end cover 231 will be squeezed by the end cover 231, so that the protrusion 2352 is locally deformed, thereby achieving a tight fit between the protrusion 2352 and the end cover 231, and then fixing the first insulating member 235 on the end cover 231.

[0170] By providing a protrusion 2352 on the first insulating member 235 that extends into the lead-out hole 2311 and interference-fitting the protrusion 2352 with the end cover 231 to connect the first insulating member 235 to the end cover 231, the first insulating member 235 can be fixed to the end cover 231. This structure facilitates assembly and is beneficial to improving the production efficiency of the end cover assembly 23.

[0171] In some embodiments, referring to FIG17 and further referring to FIG18 and FIG19 , FIG18 is a schematic structural diagram of an end cap 231 of an end cap assembly 23 provided in some further embodiments of the present application, and FIG19 is a cross-sectional view of an end cap 231 of an end cap assembly 23 provided in some further embodiments of the present application. A protrusion 2315 is provided on the wall surface of the outlet hole 2311. The protrusion 2315 presses the protrusion 2352 in the radial direction of the outlet hole 2311 to achieve an interference fit between the protrusion 2352 and the end cap 231.

[0172] Among them, the protrusion 2315 squeezes the protrusion 2352 along the radial direction of the lead-out hole 2311, that is, there is an assembly tolerance between the protrusion 2352 of the first insulating part 235 and the protrusion 2315 of the end cover 231, so that after the protrusion 2352 is inserted into the lead-out hole 2311, the protrusion 2315 can exert an extrusion effect on the protrusion 2352 and cause the protrusion 2352 to deform, so as to achieve an interference fit between the protrusion 2352 and the end cover 231.

[0173] It should be noted that, in some embodiments, the interference fit between the protrusion 2352 and the end cover 231 can also be other structures. For example, the radial size of the protrusion 2352 in the lead-out hole 2311 is larger than the aperture of the lead-out hole 2311, so that the protrusion 2352 will be squeezed by the wall surface of the lead-out hole 2311 when inserted into the lead-out hole 2311, so as to achieve an interference fit between the protrusion 2352 and the end cover 231.

[0174] By arranging a protrusion 2315 on the wall surface of the lead-out hole 2311, the protrusion 2352 of the first insulating member 235 can be squeezed along the radial direction of the lead-out hole 2311 when the protrusion 2352 is inserted into the lead-out hole 2311, thereby achieving an interference fit between the protrusion 2352 of the first insulating member 235 and the end cover 231. This structure is simple and easy to implement.

[0175] According to some embodiments of the present application, as shown in FIG. 18 and FIG. 19 , a wall surface of the outlet hole 2311 is provided with a plurality of protrusions 2315 , and the plurality of protrusions 2315 are arranged at intervals along the circumference of the outlet hole 2311 .

[0176] 18 , there are four protrusions 2315 provided on the wall surface of the outlet hole 2311, and the four protrusions 2315 are evenly and spaced apart along the circumference of the outlet hole 2311. Of course, in other embodiments, the number of protrusions 2315 provided on the wall surface of the outlet hole 2311 may also be two, three, five, or six.

[0177] In some embodiments, the protrusion 2315 provided on the wall surface of the lead-out hole 2311 may also be other structures. For example, the protrusion 2315 is an annular structure extending circumferentially along the lead-out hole 2311 , and the protrusion 2315 surrounds the outer side of the protrusion 2352 of the first insulating member 235 .

[0178] By arranging a plurality of protrusions 2315 on the wall surface of the lead-out hole 2311 and arranged at intervals along the circumference of the lead-out hole 2311, the plurality of protrusions 2315 can cooperate to squeeze the protrusion 2352. This structure is beneficial to improving the connection firmness of the interference fit between the end cover 231 and the protrusion 2352 of the first insulating member 235.

[0179] According to some embodiments of the present application, referring to Figures 17 and 19, and further referring to Figure 20, Figure 20 is a partial enlarged view of point E of the end cap 231 shown in Figure 19. The protrusion 2315 is provided with a guiding slope 2315a for guiding the protrusion 2352 into the outlet hole 2311.

[0180] In which, in the thickness direction X of the end cover, a guiding slope 2315a is formed on one end of the protrusion 2315 facing the main body 2351 of the first insulating member 235, so that the protrusion 2352 of the first insulating member 235 can be guided by the guiding slope 2315a when inserted into the lead-out hole 2311.

[0181] Illustratively, the guiding slope 2315 a is arranged at an acute angle to the wall surface of the outlet hole 2311 , and the guiding slope 2315 a is connected to the first surface 2312 of the end cover 231 .

[0182] The protrusion 2315 is also provided with a guiding slope 2315a, which can play a certain guiding role on the protrusion 2352 of the first insulating member 235, so as to guide the protrusion 2352 into the lead-out hole 2311, thereby helping to reduce the difficulty of assembling the protrusion 2352 inserted into the lead-out hole 2311 and interference fit with the end cover 231.

[0183] According to some embodiments of the present application, as shown in Figures 6 and 7, the first insulating member 235 covers a portion of the lead-out hole 2311, and the first insulating member 235 is configured to limit the seal 233 from detaching from the lead-out hole 2311 along the thickness direction X of the end cover in a direction away from the interior of the battery cell 20.

[0184] Among them, the first insulating member 235 covers part of the lead-out hole 2311, that is, in the thickness direction X of the end cover, the first insulating member 235 blocks part of the lead-out hole 2311, so that the first insulating member 235 can be abutted by the sealing member 233 to limit the sealing member 233 from detaching from the lead-out hole 2311 along the thickness direction X of the end cover in the direction away from the interior of the battery cell 20.

[0185] By setting the first insulating member 235 to cover part of the lead-out hole 2311, that is, after the first insulating member 235 and the end cover 231 are connected to each other, the first insulating member 235 can block part of the lead-out hole 2311, thereby effectively alleviating the seal 233 from running off or detaching from the lead-out hole 2311 during the subsequent assembly process of the end cover assembly 23, so as to ensure that the seal 233 can be assembled in the lead-out hole 2311, thereby effectively reducing the seal 233 from being damaged or improperly assembled during the subsequent assembly process of the end cover assembly 23, which is beneficial to reducing the risk of leakage of the battery cell 20 having such an end cover assembly 23, thereby improving the safety and service life of the battery cell 20.

[0186] According to some embodiments of the present application, as shown in Figures 6, 7, and 8, the first insulating member 235 includes a main body 2351 and a protrusion 2352. Along the thickness direction X of the end cap, at least a portion of the main body 2351 is disposed between the connector 234 and the end cap 231. The protrusion 2352 protrudes from the surface of the main body 2351 facing the end cap 231, and at least a portion of the protrusion 2352 extends into the lead-out hole 2311. The protrusion 2352 is configured to limit the seal 233 from escaping from the lead-out hole 2311 along the thickness direction X of the end cap in a direction away from the interior of the battery cell 20.

[0187] Among them, the protrusion 2352 protrudes from the surface of the main body 2351 facing the end cover 231, and at least part of the protrusion 2352 extends into the lead-out hole 2311, that is, the protrusion 2352 has at least part located in the lead-out hole 2311, and is located between the pole 232 and the hole wall of the lead-out hole 2311, so that the protrusion 2352 can not only limit the seal 233 from detaching from the lead-out hole 2311 in the direction away from the interior of the battery cell 20, but also play the role of insulating and isolating the pole 232 and the hole wall of the lead-out hole 2311.

[0188] The first insulating member 235 is provided with a main body portion 2351 and a protrusion 2352. The main body portion 2351 is arranged between the connecting member 234 and the end cover 231 to serve as an insulator to isolate the connecting member 234 and the end cover 231, and the protrusion 2352 is protruded from the surface of the main body portion 2351 facing the end cover 231, so that at least part of the protrusion 2352 is located in the lead-out hole 2311, so that the protrusion 2352 can be abutted by the sealing member 233 in the thickness direction X of the end cover, thereby having a better restrictive effect on the sealing member 233, so as to prevent the sealing member 233 from detaching from the lead-out hole 2311 in the direction away from the interior of the battery cell 20 in the thickness direction X of the end cover, thereby reducing the risk of leakage of the battery cell 20 due to damage or improper assembly of the sealing member 233 in subsequent assembly.

[0189] In some embodiments, as shown in FIG. 7 and FIG. 8 , the protrusion 2352 is disposed around the pole 232 .

[0190] The protrusion 2352 is disposed around the pole 232, i.e., the protrusion 2352 is an annular structure extending along the circumference of the lead-out hole 2311, and the protrusion 2352 surrounds the outside of the pole 232. The protrusions 2352 are disposed in a one-to-one correspondence with the poles 232. For example, in FIG6 , there are two poles 232, and correspondingly, there are also two protrusions 2352.

[0191] It should be noted that, in other embodiments, the protrusion 2352 can also be an intermittent structure arranged along the circumference of the lead-out hole 2311, that is, a plurality of protrusions 2352 are protruded on the surface of the main body 2351 of the first insulating member 235 facing the end cover 231, and the plurality of protrusions 2352 are arranged at intervals along the circumference of the lead-out hole 2311 and around the pole 232.

[0192] By surrounding the protrusion 2352 on the outside of the pole 232, the first insulating member 235 with this structure can, on the one hand, play a better insulating isolation role between the pole 232 and the wall surface of the lead-out hole 2311 through the protrusion 2352, thereby reducing the risk of short circuit between the pole 232 and the wall surface of the lead-out hole 2311. On the other hand, the protrusion 2352 with an annular structure can play a better restrictive role on the seal 233 arranged on the outside of the pole 232, thereby alleviating the phenomenon that the seal 233 appears in the thickness direction X of the end cover and separates from the lead-out hole 2311 in the direction away from the interior of the battery cell 20.

[0193] In some embodiments, the main body 2351 and the protrusion 2352 are an integrally formed structure.

[0194] The main body 2351 and the protrusion 2352 can be manufactured by casting, extrusion molding, or stamping to form an integrated structure of the main body 2351 and the protrusion 2352. Of course, in other embodiments, the main body 2351 and the protrusion 2352 can also be separate structures, with the protrusion 2352 connected to the main body 2351 by bonding or clamping.

[0195] The first insulating member 235 having an integrated structure of the main body 2351 and the protruding portion 2352 is easy to manufacture, which helps reduce the manufacturing difficulty and facilitates the assembly of the first insulating member 235 onto the end cover 231 , which helps reduce the assembly difficulty of the end cover assembly 23 .

[0196] According to some embodiments of the present application, as shown in Figures 4, 5, and 6, the end cap assembly 23 further includes a current collecting member 238 and a second insulating member 239. Along the thickness direction X of the end cap, the current collecting member 238 is disposed on the side of the end cap 231 facing the interior of the battery cell 20. The current collecting member 238 is connected to the electrode post 232 and is used to electrically connect to the electrode assembly 22. The second insulating member 239 is disposed between the current collecting member 238 and the end cap 231 to insulate and isolate the current collecting member 238 from the end cap 231.

[0197] The current collecting member 238 connects the pole 232 and the tab 221 of the electrode assembly 22 to achieve electrical connection between the pole 232 and the electrode assembly 22. The current collecting member 238 can be made of various materials, such as copper, iron, aluminum, or steel.

[0198] The second insulating member 239 is disposed between the current collecting member 238 and the end cover 231 along the thickness direction X of the end cover to insulate and isolate the current collecting member 238 from the end cover 231. The second insulating member 239 can also be made of various materials, such as rubber, plastic or the like.

[0199] A current collecting member 238 is also provided on the side of the end cap 231 facing the interior of the battery cell 20. This current collecting member 238 connects the terminal post 232 to the electrode assembly 22, thereby achieving electrical connection between the electrode assembly 22 and the terminal post 232. This structure is simple and easy to assemble. Furthermore, a second insulating member 239 is provided between the current collecting member 238 and the end cap 231. This second insulating member 239 provides insulation between the current collecting member 238 and the end cap 231, thereby reducing the risk of short circuits in battery cells 20 equipped with this end cap assembly 23.

[0200] According to some embodiments of the present application, a battery cell 20 is provided, comprising a housing 21, an electrode assembly 22, and an end cap assembly 23 according to any of the above embodiments. The housing 21 has an opening 211, and the electrode assembly 22 is accommodated within the housing 21. An end cap 231 covers the opening 211. A first insulating member 235 is disposed on a side of the end cap 231 facing away from the electrode assembly 22, along the thickness direction X of the end cap.

[0201] According to some embodiments of the present application, a battery 100 is further provided. The battery 100 includes a battery cell 20 according to any of the above solutions.

[0202] According to some embodiments of the present application, an electrical device is further provided, comprising the battery cell 20 of any of the above solutions, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0203] The power-consuming device may be any of the aforementioned devices or systems using the battery cell 20 .

[0204] According to some embodiments of the present application, as shown in Figures 4 to 10, the present application provides an end cap assembly 23, which includes an end cap 231, two poles 232, two seals 233, a connector 234, a first insulating member 235, a current collecting member 238, and a second insulating member 239. The end cap 231 is provided with two lead-out holes 2311, which pass through the end cap 231 along the thickness direction X of the end cap. The two poles 232 are respectively provided in one lead-out hole 2311. Each seal 233 is sleeved on the outside of a pole 232, and at least a portion of the seal 233 is located in the lead-out hole 2311 to seal the gap between the pole 232 and the end cap 231. The connector 234 is located on the side of the end cap 231 facing away from the interior of the battery cell 20, and the connector 234 connects the pole 232. The first insulating member 235 includes a main body 2351 and two protrusions 2352. At least a portion of the main body 2351 is disposed between the connector 234 and the end cap 231 along the thickness direction X of the end cap, insulating and isolating the connector 234 from the end cap 231. The protrusions 2352 protrude from the surface of the main body 2351 facing the end cap 231. At least a portion of the protrusions 2352 extends into the lead-out hole 2311. Each protrusion 2352 surrounds the outside of a terminal post 232 and is configured to prevent the seal 233 from disengaging from the lead-out hole 2311 along the thickness direction X of the end cap in a direction away from the interior of the battery cell 20. A current collecting member 238 is disposed on the side of the end cap 231 facing the interior of the battery cell 20 along the thickness direction X of the end cap. The current collecting member 238 is connected to the terminal post 232 and is used to electrically connect to the electrode assembly 22. The second insulating member 239 is disposed between the current collecting member 238 and the end cap 231 to insulate and isolate the current collecting member 238 from the end cap 231. Along the thickness direction X of the end cap, the end cap 231 has a first surface 2312 facing away from the interior of the battery cell 20. The first surface 2312 is provided with a snap-fitting hole 2313. The first insulating member 235 is provided with a snap-fitting portion 2353, which snaps into engagement with the snap-fitting hole 2313.

[0205] According to some embodiments of the present application, a method for manufacturing an end cap assembly 23 is further provided. Referring to FIG. 21 , FIG. 21 is a flow chart of a method for manufacturing an end cap assembly 23 provided in some embodiments of the present application. The manufacturing method includes:

[0206] S100: providing an end cover 231 , a pole 232 , a seal 233 and a first insulating member 235 . The end cover 231 is provided with a lead-out hole 2311 , which passes through the end cover 231 along a thickness direction X of the end cover.

[0207] S200: Connect the first insulating member 235 to the end cover 231 to fix the first insulating member 235 to one side of the end cover 231 in the thickness direction X of the end cover (refer to FIG. 22 , which is a schematic diagram of the connection between the end cover 231 and the first insulating member 235 according to some embodiments of the present application);

[0208] S300: Sleeve the seal 233 onto the outer side of the pole 232;

[0209] S400: Pass the pole 232 through the end cover 231 and the first insulating member 235 in sequence, so that at least a portion of the sealing member 233 is located in the lead-out hole 2311;

[0210] The first insulating member 235 is configured to restrict the sealing member 233 from being separated from the lead-out hole 2311 along the thickness direction X of the end cover in a direction away from the interior of the battery cell 20 .

[0211] In step S200 , the first insulating member 235 and the end cover 231 may be connected in various ways, such as bonding, snap-fitting, or interference fit.

[0212] It should be noted that in the thickness direction X of the end cover, the first insulating member 235 at least partially covers the lead-out hole 2311, so that after the first insulating member 235 is connected to the end cover 231, the first insulating member 235 can limit the sealing member 233 from detaching from the lead-out hole 2311 along the thickness direction X of the end cover in a direction away from the interior of the battery cell 20.

[0213] In the above manufacturing method, the manufacturing method of the end cover assembly 23 is to first connect the first insulating member 235 and the end cover 231 to each other, so that the first insulating member 235 and the end cover 231 are fixed to each other, and then the pole 232 with the sealing member 233 is inserted into the lead-out hole 2311 of the end cover 231. That is to say, the first insulating member 235 and the end cover 231 are pre-assembled and fixed to each other before assembling other components such as the pole 232 and the sealing member 233. This assembly method can better restrict the sealing member 233 through the first insulating member 235. The seal 233 is used so that when the pole 232 passes through the end cover 231 and the first insulating part 235, the seal 233 will be blocked by the first insulating part 235, thereby alleviating the situation where the seal 233 deviates or separates from the lead-out hole 2311 in the direction away from the interior of the battery cell 20 in the thickness direction X of the end cover, thereby reducing the seal 233 from being damaged or improperly assembled during the subsequent assembly process of the end cover assembly 23, which is beneficial to reducing the risk of leakage in the battery cell 20 with such an end cover assembly 23, thereby improving the safety and service life of the battery cell 20.

[0214] According to some embodiments of the present application, referring to FIG. 23 , FIG. 23 is a flow chart of a method for manufacturing an end cap assembly 23 provided in some other embodiments of the present application. The method for manufacturing the end cap assembly 23 further includes:

[0215] S500: providing a current collecting member 238 and a second insulating member 239;

[0216] Before step S300: sleeve the seal 233 onto the outer side of the pole 232, the manufacturing method of the end cap assembly 23 further includes:

[0217] S600: The pole 232 is passed through the current collecting member 238 and the second insulating member 239 in sequence (see FIG. 24 , which is a schematic diagram of the connection between the pole 232 , the second insulating member 239 and the current collecting member 238 provided in some embodiments of the present application).

[0218] It should be noted that, in FIG. 23 , step S500 is provided after step S200 . Of course, in some embodiments, step S500 may also be provided before step S200 or before step S100 .

[0219] In the above-mentioned manufacturing method, the assembly method of the end cover assembly 23 also includes first passing the pole 232 through the current collecting component 238 and the second insulating component 239 before the seal 233 is sleeved on the outside of the pole 232, and then sleeved on the outside of the pole 232, and finally assembling the pole 232 assembled with the current collecting component 238, the second insulating component 239 and the seal 233 into the lead-out hole 2311 of the end cover 231 to assemble the second insulating component 239 and the current collecting component 238 to the end cover 231. This assembly method has low assembly difficulty and high assembly efficiency.

[0220] According to some embodiments of the present application, referring to FIG. 25 , FIG. 25 is a flow chart of a method for manufacturing an end cap assembly 23 provided in some further embodiments of the present application. The method for manufacturing the end cap assembly 23 further includes:

[0221] S700: providing a connecting member 234;

[0222] After the pole 232 is passed through the end cap 231 and the first insulating member 235 in sequence in step S400, the manufacturing method of the end cap assembly 23 further includes:

[0223] S800 : Connect the connecting member 234 to the pole 232 , so that at least a portion of the first insulating member 235 is disposed between the connecting member 234 and the end cover 231 .

[0224] For example, the connector 234 and the pole 232 are riveted to each other. Of course, in other embodiments, the connector 234 and the pole 232 can also be welded or bonded to each other.

[0225] It should be noted that, in FIG. 25 , step S700 is provided after step S400 . Of course, in some embodiments, step S700 may be provided before or after any step before step S800 .

[0226] In the above-mentioned manufacturing method, the assembly method of the end cover assembly 23 also includes connecting the connecting member 234 to the pole 232 after the pole 232 passes through the end cover 231 and the first insulating member 235, so that the pole 232 and other components can be fastened to the end cover 231, and the first insulating member 235 can be further fastened to the end cover 231 to ensure the structural stability of the end cover assembly 23.

[0227] It should be noted that the relevant structures of the end cover assembly 23 manufactured by the manufacturing method provided in the above embodiments can be referred to the end cover assembly 23 provided in the above embodiments, and will not be repeated here.

[0228] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0229] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An end cap assembly for a battery cell, the end cap assembly comprising: The end cover is provided with a lead-out hole, and the lead-out hole penetrates the end cover along the thickness direction of the end cover; A pole, passing through the lead-out hole; a sealing member, sleeved on the outer side of the pole, wherein at least a portion of the sealing member is located in the lead-out hole to seal the gap between the pole and the end cover; a connector, located on a side of the end cover facing away from the interior of the battery cell, the connector being connected to the pole; as well as a first insulating member, at least partially disposed between the connecting member and the end cover to insulate and isolate the connecting member and the end cover; Wherein, the first insulating member is connected to the end cover to fix the first insulating member.

2. The end cap assembly according to claim 1, wherein: The first insulating member is detachably connected to the end cover.

3. The end cap assembly according to claim 1 or 2, wherein: The first insulating member is clamped to the end cover.

4. The end cap assembly according to claim 3, wherein: Along the thickness direction of the end cover, the end cover has a first surface facing away from the interior of the battery cell. The first surface is provided with a snap-fit ​​hole. The first insulating member is protruded with a snap-fit ​​portion, which is snap-fitted with the snap-fit ​​hole.

5. The end cap assembly according to claim 4, wherein: Along the thickness direction of the end cover, the engaging hole includes a first hole segment and a second hole segment arranged in sequence, the aperture of the first hole segment is smaller than the aperture of the second hole segment, and the first hole segment is closer to the first surface than the second hole segment; The clamping portion has a limiting section located in the second hole section, and a diameter of the limiting section is larger than a hole diameter of the first hole section.

6. The end cap assembly according to any one of claims 1 to 5, wherein: The first insulating member is bonded to the end cover via an adhesive layer.

7. The end cap assembly according to claim 6, wherein: Along the thickness direction of the end cover, the end cover has a first surface facing away from the interior of the battery cell. The first surface is provided with a receiving groove, and the receiving groove is used to receive at least a portion of the adhesive layer.

8. The end cap assembly according to claim 7, wherein: The first insulating member is provided with a protruding butt joint portion, and at least a portion of the butt joint portion is embedded in the adhesive layer.

9. The end cap assembly according to claim 8, wherein: At least a portion of the docking portion is located in the accommodating groove.

10. The end cap assembly according to any one of claims 7 to 9, wherein: The accommodating groove is an annular groove, and the accommodating groove is arranged around the outlet hole.

11. The end cap assembly according to any one of claims 6 to 10, wherein: The adhesive layer is an annular structure, and the adhesive layer is arranged around the lead-out hole.

12. The end cap assembly according to any one of claims 1 to 5, wherein: Along the thickness direction of the end cover, the end cover has a first surface facing away from the interior of the battery cell. The first surface is provided with a receiving groove, which is an annular groove and is arranged around the lead-out hole.

13. The end cap assembly according to any one of claims 1 to 12, wherein: The first insulating member has a protruding portion extending into the lead-out hole, and the protruding portion is interference-fitted with the end cover.

14. The end cap assembly of claim 13, wherein: A protrusion is provided on the wall surface of the outlet hole, and the protrusion presses the protruding portion along the radial direction of the outlet hole to achieve interference fit between the protruding portion and the end cover.

15. The end cap assembly of claim 14, wherein: A plurality of protrusions are provided on the hole wall surface of the outlet hole, and the plurality of protrusions are arranged at intervals along the circumference of the outlet hole.

16. The end cap assembly according to claim 14 or 15, wherein: The protrusion is provided with a guide slope for guiding the protruding portion into the outlet hole.

17. The end cap assembly according to any one of claims 1 to 16, wherein: The first insulating member covers a portion of the lead-out hole, and is configured to restrict the sealing member from being separated from the lead-out hole in a direction away from the interior of the battery cell along a thickness direction of the end cover.

18. The end cap assembly of claim 17, wherein: The first insulating member comprises: a main body portion, at least a portion of which is disposed between the connecting member and the end cover along a thickness direction of the end cover; A protrusion protrudes from the surface of the main body facing the end cover, at least part of the protrusion extends into the lead-out hole, and the protrusion is configured to limit the seal from detaching from the lead-out hole along the thickness direction of the end cover in a direction away from the interior of the battery cell.

19. The end cap assembly of claim 18, wherein: The protrusion is arranged around the pole.

20. The end cap assembly according to claim 18 or 19, wherein: The main body and the protruding portion are an integrally formed structure.

21. The end cap assembly according to any one of claims 1 to 20, wherein: The end cap assembly further comprises: a current collecting member, disposed on a side of the end cover facing the interior of the battery cell, the current collecting member being connected to the electrode post and being used for electrical connection to the electrode assembly; The second insulating member is disposed between the current collecting member and the end cover to insulate and isolate the current collecting member from the end cover.

22. A battery cell comprising: a housing having an opening; an electrode assembly, housed in the housing; as well as The end cap assembly according to any one of claims 1 to 21, wherein the end cap covers the opening, and the first insulating member is arranged on a side of the end cap facing away from the electrode assembly.

23. A battery comprising the battery cell according to claim 22.

24. An electric device comprising the battery cell according to claim 22.

25. A method for manufacturing an end cap assembly, comprising: Providing an end cover, a pole, a sealing member and a first insulating member, wherein the end cover is provided with a lead-out hole, and the lead-out hole penetrates the end cover along the thickness direction of the end cover; Connecting the first insulating member to the end cover to fix the first insulating member to one side of the end cover in the thickness direction of the end cover; Sleeve the sealing member on the outer side of the pole; Passing the pole through the end cover and the first insulating member in sequence, so that at least a portion of the sealing member is located in the lead-out hole; The first insulating member is configured to restrict the sealing member from being separated from the lead-out hole along the thickness direction of the end cover in a direction away from the interior of the battery cell.

26. The method for manufacturing an end cap assembly according to claim 25, wherein: The method for manufacturing the end cap assembly further includes: providing a current collecting member and a second insulating member; Before the sealing member is sleeved on the outer side of the pole, the manufacturing method of the end cover assembly further includes: The pole is passed through the current collecting member and the second insulating member in sequence.

27. The method for manufacturing an end cap assembly according to claim 25 or 26, wherein: The method for manufacturing the end cap assembly further includes: Provide connectors; After the pole is passed through the end cover and the first insulating member in sequence, the method for manufacturing the end cover assembly further includes: The connecting member is connected to the pole so that at least a portion of the first insulating member is disposed between the connecting member and the end cover.

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