WO2024065708A1

WO2024065708A1 - End cap assembly and manufacturing method therefor, battery cell, battery and electrical device

Info

Publication number: WO2024065708A1
Application number: PCT/CN2022/123354
Authority: WO
Inventors: 苏华圣
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2024-04-04

Abstract

The present application belongs to the technical field of batteries. Provided are an end cap assembly and a manufacturing method therefor, a battery cell, a battery and an electrical device. The end cap assembly comprises an end cap, a post terminal, a sealing piece, a connecting piece and a first insulating piece. The end cap is provided with a lead-out hole, and the lead-out hole penetrates through the end cap in a thickness direction of the end cap. The post terminal passes through the leading-out hole. The sealing piece is sleeved on the outside of the post terminal, and is at least partially located in the lead-out hole. The connecting piece is located on the side of the end cap away from the interior of a battery cell, and is connected to the post terminal. The first insulating piece is at least partially arranged between the connecting piece and the end cap so as to insulate the connecting piece from the end cap. The first insulating piece is connected to the end cap so as to fix the first insulating piece. The end cap assembly can improve the connection stability between the first insulating piece and the end cap, and alleviate the phenomenon of relative movement or separation of the first insulating piece and the end cap in the assembly process of the end cap assembly, thereby facilitating the improvement in the assembly efficiency and production yield of the end cap assembly.

Description

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

Technical Field

The present application relates to the field of battery technology, and in particular to an end cover assembly and a manufacturing method thereof, a battery cell, a battery and an electrical device.

Background technique

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 and service life. The battery cell of the battery is assembled into an electrode assembly (bare battery cell) by winding or laminating the positive electrode sheet, the negative electrode sheet and the diaphragm, and then loaded into the shell, and then 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 a closed 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.

Summary of the invention

The embodiments of the present application provide an end cap assembly and a method for manufacturing the same, 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.

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, the lead-out hole passes through the end cap along the thickness direction of the end cap; the pole is inserted into the lead-out hole; the seal is sleeved on the outside of the pole, at least part 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, the connector connects the pole; at least part of the first insulating member is arranged 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.

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.

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

In the above technical solution, the first insulating member is connected to the end cover in a detachable 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 to reduce the difficulty of assembly, and facilitating the later disassembly of the first insulating member and the end cover, which helps to reduce the difficulty of later maintenance or replacement.

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

In the above technical solution, the first insulating member is connected to the end cover by means of a snap connection, so as to fix the first insulating member on the end cover. This structure is simple and easy to manufacture.

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.

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 into each other to achieve the clamping connection between the first insulating member and the end cover. The structure is simple and easy to implement.

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.

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

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

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.

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, and the receiving groove is used to receive at least a portion of the adhesive layer.

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 ensured so that the first insulating member can be bonded to the end cover through the adhesive layer.

In some embodiments, the first insulating member is provided with a mating portion protruding therefrom, and at least a portion of the mating portion is embedded in the adhesive layer.

In the above technical solution, the first insulating member is provided with a docking portion embedded in the adhesive layer, that is, at least a portion of the docking portion is covered by the adhesive layer. The end cover assembly adopting such a structure can increase the contact area between the first insulating member and the adhesive layer, thereby facilitating improving the bonding strength between the first insulating member and the end cover, so as to improve the connection strength between the first insulating member and the end cover.

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

In the above technical solution, by setting at least a portion of the docking part to be located in the accommodating groove, that is, the docking part extends into the accommodating groove, so that at least a portion of the docking part is inserted into the accommodating groove, the use of this structure can further increase the contact area between the docking part 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.

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

In the above technical solution, by setting the receiving groove as an annular groove structure surrounding the outside of the lead-out hole, the receiving groove with such a structure can accommodate the adhesive layer while alleviating the phenomenon of the adhesive layer entering into the lead-out hole, thereby facilitating the assembly quality of the end cap assembly. In addition, by setting the receiving groove as an annular structure and surrounding the outside of the lead-out hole, the receiving groove can play a certain blocking role on the electrolyte, thereby reducing the phenomenon of the electrolyte entering into the lead-out hole, thereby facilitating reducing the risk of short circuit between the pole and the end cap.

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

In the above technical solution, by setting the adhesive layer as an annular structure arranged around the lead-out hole, on the one hand, the bonding area between the end cover and the first insulating member can be increased, and on the other hand, the phenomenon of the adhesive layer entering the lead-out hole can be alleviated. In addition, while the adhesive layer of the annular structure plays a role in connecting the first insulating member and the end cover, the adhesive layer surrounding the outside of the lead-out hole can also play a certain role in blocking the electrolyte, thereby reducing the phenomenon of the electrolyte entering the lead-out hole, which is conducive to reducing the risk of short circuit between the pole and the end cover.

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 receiving groove, the receiving groove is an annular groove, and the receiving groove is provided around the lead-out hole.

In the above technical solution, a receiving groove with an annular structure 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.

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.

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 easy to assemble and is beneficial to improving the production efficiency of the end cover assembly.

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.

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.

In some embodiments, a plurality of the protrusions are disposed on the wall surface of the outlet hole, and the plurality of the protrusions are spaced apart along the circumference of the outlet hole.

In the above technical solution, a plurality of protrusions are arranged at intervals along the circumference of the lead-out hole on the hole 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.

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

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.

In some embodiments, the first insulating member covers a portion of the lead-out hole, and the first insulating member is configured to limit the seal 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.

In the above technical solution, by setting the first insulating member to cover 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 part of the lead-out hole, thereby effectively alleviating the situation where the seal is deviated or separated 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.

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 in a direction away from the interior of the battery cell along the thickness direction of the end cover.

In the above technical solution, the first insulating member is provided with a main body portion and a protruding portion. The main body portion is arranged between the connecting member and the end cover to play the role of insulating and isolating the connecting member and the end cover, and the protruding portion is protruding from the surface of the main body portion 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 abutted by the sealing member in the thickness direction of the end cover, thereby being able to play a better limiting role on the sealing member to prevent the sealing member 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 sealing member in subsequent assembly.

In some embodiments, the protrusion is arranged around the pole.

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 outer side of the pole, the first insulating member adopting such a 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, and on the other hand, the protrusion of the annular structure can play a better limiting role on the seal sleeved on the outer side 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.

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

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.

In some embodiments, the end cap assembly further includes a current collecting member and a second insulating member; the current collecting member is disposed on the side of the end cap 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 disposed between the current collecting member and the end cap to insulate and isolate the current collecting member and the end cap.

In the above technical solution, a current collecting member is also provided on the side of the end cover facing the inside of the battery cell, and the pole and the electrode assembly can be connected through the current collecting member, so that the electrical connection between the electrode assembly and the pole can be achieved, and the structure is simple and easy to assemble. In addition, a second insulating member is also provided between the current collecting member and the end cover, and the insulation isolation between the current collecting member and the end cover can be achieved through the second insulating member, so that the risk of short circuit in the battery cell with such an end cover assembly can be reduced.

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 away from the electrode assembly.

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

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

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

In the above technical scheme, the manufacturing method of the end cover assembly is to first connect the first insulating member and the end cover to each other, so that the first insulating member 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, the first insulating member and the end cover are pre-assembled and fixed to each other before assembling other components such as the pole and the seal. This assembly method can better restrict the seal through the first insulating member, so that the seal will be blocked by the first insulating member when the pole passes through the end cover and the first insulating member, thereby alleviating the situation that the seal runs off or detaches from the lead-out hole in the direction away from the inside of the battery cell in the thickness direction of the end cover, so as to reduce the phenomenon that the seal is damaged or assembled improperly 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.

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 sealing component 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.

In the above technical solution, the assembly method of the end cover assembly also includes first passing the pole through the current collecting component and the second insulating component before the sealing component 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 component, the second insulating component and the sealing component into the lead-out hole of the end cover to assemble the second insulating component and the current collecting component to the end cover. This assembly method has low assembly difficulty and high assembly efficiency.

In some embodiments, the method for manufacturing the end cap assembly further includes: providing a connecting piece; after the pole is passed through the end cap and the first insulating piece in sequence, the method for manufacturing the end cap 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 cap.

In the above technical solution, the assembly method of the end cover assembly also includes connecting the connecting piece to the pole after the pole passes through the end cover and the first insulating piece, so that the pole and other components can be fastened to the end cover, and the first insulating piece can be further fastened to the end cover to ensure the structural stability of the end cover assembly.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

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

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

FIG4 is a schematic diagram of the structure of an end cap assembly provided in some embodiments of the present application;

FIG5 is an exploded view of the structure of an end cover assembly provided in some embodiments of the present application;

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

FIG7 is a partial enlarged view of the end cover assembly at A shown in FIG6;

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

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

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

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

FIG12 is a partial enlarged view of the B portion of the end cap assembly shown in FIG11;

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

FIG14 is a partial enlarged view of the end cover assembly at C shown in FIG13;

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

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

FIG17 is a partial enlarged view of the end cover assembly at D shown in FIG16;

FIG18 is a schematic structural diagram of an end cap of an end cap assembly provided in some other embodiments of the present application;

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

FIG20 is a partial enlarged view of the end cover at position E shown in FIG19;

FIG. 21 is a schematic flow chart of a method for manufacturing an end cap assembly according to some embodiments of the present application;

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;

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

FIG24 is a schematic diagram of the connection between a pole, a second insulating member and a current collecting member provided in some embodiments of the present application;

FIG. 25 is a schematic flow chart of a method for manufacturing an end cap assembly provided in some further embodiments of the present application.

Icons: 1000-vehicle; 100-battery; 10-box; 11-first box body; 12-second box body; 20-battery cell; 21-shell; 211-opening; 22-electrode assembly; 221-ear; 23-end cover assembly; 231-end cover; 2311-lead hole; 2312-first surface; 2313-clamping hole; 2313a-first hole section; 2313b-second hole section; 2314-accommodating 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 ways

In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

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

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

The term "and/or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/" in this application generally indicates that the associated objects before and after are in an "or" relationship.

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

The term "plurality" used in the present application refers to two or more (including two).

In the present 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 the present application do not limit this. Battery cells may be cylindrical, flat, rectangular, or in other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of the present application do not limit this.

The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells or multiple battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

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 mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode collector, and the part of the positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode tab to realize the input or output of electric energy of the positive electrode sheet through the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode collector, and the part of the negative electrode collector not coated with the negative electrode active material layer serves as a negative electrode tab to realize the input or output of electric energy of the negative electrode sheet through the negative electrode tab. The material of the negative electrode collector may be copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current can pass without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

The material of the isolation film may be polypropylene (PP) or polyethylene (PE), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are an important part of the development of new energy today. The battery cell is assembled into an electrode assembly (bare cell) by winding or stacking the positive electrode sheet, the negative electrode sheet, and the isolation film, which is then loaded into the shell, covered with the end cover assembly, and finally injected with electrolyte.

The inventor found that for a general battery cell, the end cap assembly is usually composed of an end cap, a pole, an upper plastic, a lower plastic and a rivet block. The end cap is provided with a lead-out hole, the pole is inserted into the lead-out hole, the upper plastic and the lower plastic are respectively provided on both sides of the end cap to insulate and isolate the pole and the end cap, and the rivet block and the pole are riveted to each other to fasten the pole, the upper plastic and the lower plastic to the end cap, so that the input and output of the electric energy of the battery cell can be realized through the pole. However, the end cap assembly of this structure is fastened by the rivet block to fasten the upper plastic and the pole and other components, so that the upper plastic and the end cap are very likely to move or separate relative to each other during the production and assembly process of the end cap assembly, which is not conducive to the subsequent assembly of other components of the end cap assembly, resulting in low assembly efficiency of the end cap assembly, and on the other hand, it is very easy for the end cap assembly to be repaired and reworked, resulting in poor assembly quality of the end cap assembly, which is not conducive to improving the production qualification rate of the end cap assembly.

Based on the above considerations, in order to solve the problem of low assembly efficiency and production qualification rate of battery cells, the inventors have designed an end cover assembly after in-depth research, and 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 inside 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.

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

The end cap assembly disclosed in the embodiment of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device, which is helpful to alleviate the phenomenon of relative movement or separation between the upper plastic and the end cap of the end cap assembly during the production and assembly process, so as to improve the assembly efficiency and production qualification rate of the end cap assembly.

The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

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.

Please refer to Figure 1, which is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may 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 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and driving power requirements of the vehicle 1000.

In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

Please refer to FIG. 2, which is an exploded view of the structure of the battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is used to be accommodated in the box body 10. Among them, the box body 10 is used to provide an assembly space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box 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.

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 mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

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

Please refer to FIG. 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, the electrode assembly 22 is accommodated in the housing 21, the end cap assembly 23 covers the opening 211, and the end cap assembly 23 is electrically connected to the electrode assembly 22 to realize the input or output of electrical energy of the battery cell 20.

The housing 21 may also be used to contain electrolytes, such as electrolytes. The housing 21 may be in various structural forms. The housing 21 may also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

For example, in FIG3 , the housing 21 is a hollow structure with openings 211 on opposite sides, and the battery cell 20 includes two end cap assemblies 23, one end cap assembly 23 correspondingly covers one opening 211 of the housing 21 and forms a sealed connection to form 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 in the housing 21 first, and then one end cap assembly 23 is covered on one opening 211 of the housing 21, and the electrolyte is filled into the housing 21, and then the other end cap assembly 23 is covered on the other opening 211 of the housing 21 to complete the assembly of the battery cell 20.

It is understandable that the battery cell 20 is not limited to the above structure, and the battery cell 20 may also be 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.

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. Exemplarily, in FIG. 3, the electrode assembly 22 is a cylindrical structure, the shell 21 is a cylindrical structure, and the end cap assembly 23 covers the opening 211 of the shell 21.

The end cover 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.

It should be noted that the electrode assembly 22 is a component in the battery cell 20 where an 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 a positive electrode sheet, a separator, and a negative electrode sheet, or a stacked structure formed by stacking a positive electrode sheet, a separator, and a negative electrode sheet. Exemplarily, in FIG3 , the electrode assembly 22 is a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet.

As shown in FIG. 3 , pole ears 221 are formed at both ends of the electrode assembly 22, that is, pole ears 221 are formed at one end of the electrode assembly 22 facing the end cap assembly 23, and the pole ears 221 are used to be electrically connected to the end cap assembly 23 to achieve electrical connection between the electrode assembly 22 and the end cap assembly 23, so as to achieve input or output of electric energy of the battery cell 20. Among them, the two pole ears 221 are used to output the positive electrode and the negative electrode of the electrode assembly 22, respectively, and correspondingly, the two end cap assemblies 23 are also used as the positive output electrode and the negative output electrode of the battery cell 20, respectively. It should be noted that the pole ears 221 of the electrode assembly 22 can be directly connected to the end cap assembly 23, for example, the pole ears 221 are connected to the end cap assembly 23 by welding or abutment, etc. Of course, the pole ears 221 of the electrode assembly 22 can also be indirectly connected to the end cap assembly 23, for example, the pole ears 221 are connected to other components and then welded or abutted to the end cap assembly 23.

Optionally, there may be one or more electrode assemblies 22 contained in the housing 21. For example, in FIG3 , there is one electrode assembly 22.

According to some embodiments of the present application, referring to FIG. 3 and further referring to FIG. 4 to FIG. 7, FIG. 4 is a schematic diagram of the structure of the end cap assembly 23 provided in some embodiments of the present application, FIG. 5 is an exploded view of the structure 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 the A portion of the end cap assembly 23 shown in FIG. 6. The present application provides an end cap assembly 23, which includes an end cap 231, a pole 232, a seal 233, a connector 234 and a first insulating member 235. The end cap 231 is provided with an outlet hole 2311, and the outlet hole 2311 penetrates the end cap 231 along the thickness direction X of the end cap. The pole 232 is arranged in the outlet hole 2311. The seal 233 is sleeved on the outer side of the pole 232, and at least part of the seal 233 is located in the outlet 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 cover 231 away from the inside of the battery cell 20, and the connector 234 is connected to the pole 232. At least part of the first insulating member 235 is disposed between the connector 234 and the end cover 231 to insulate and isolate the connector 234 and the end cover 231. The first insulating member 235 is connected to the end cover 231 to fix the first insulating member 235.

The end cap 231 serves to cover the opening 211 of the housing 21, so that the end cap 231 and the housing 21 form a sealed space for accommodating the electrode assembly 22 and the electrolyte. The lead-out hole 2311 on the end cap 231 is used to assemble the pole 232. The lead-out hole 2311 passes through both sides of the end cap 231 in the thickness direction X of the end cap, so that the pole 232 can be inserted into the lead-out hole 2311. The material of the end cap 231 can be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

The pole 232 serves to output or input electrical energy of the battery cell 20. Lead-out holes 2311 extend from both ends of the pole 232 along the thickness direction X of the end cover. 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.

For example, in FIG. 5 and FIG. 6 , there are two poles 232, and correspondingly, there are two lead-out holes 2311 and two seals 233 on the end cover 231, each pole 232 is inserted into one lead-out hole 2311, and each seal 233 is sleeved on the outside of one pole 232, and both poles 232 are used to be electrically connected to the pole lug 221 of the electrode assembly 22, so as to cooperate 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 arranged one-to-one with the poles 232.

The seal 233 is sleeved on the outer side 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 outer side 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 FIG. 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.

Exemplarily, in FIG. 7 , the sealing member 233 is a sealing ring, and the material of the sealing member 233 may be rubber, silicone, nylon, or the like.

The connector 234 is used to connect the pole 232 to fix the pole 232 and other components on the end cover 231. Exemplarily, the connector 234 is a riveting block. In FIG6 , the connector 234 and the two poles 232 are riveted to each other, so that the pole 232 and the first insulating member 235 can be fastened to the end cover 231.

At least part of the first insulating member 235 is disposed between the connector 234 and the end cap 231, that is, the first insulating member 235 has a part disposed between the connector 234 and the end cap 231, so as to insulate and isolate the end cap 231 and the connector 234, so as to reduce the risk of short circuit between the end cap 231 and the connector 234. For example, in FIG6 and FIG7, 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, and the body 2351 is used to separate the end cap 231 and the connector 234 to insulate the end cap 231 and the connector 234. At least part of the protrusion 2352 extends into the lead-out hole 2311 and is located between the pole 232 and the hole wall of the lead-out hole 2311 to insulate and isolate the pole 232 and the end cap 231.

The first insulating member 235 is connected to the end cover 231 , and there are many ways to connect the first insulating member 235 and the end cover 231 , such as bonding, snap-fitting or interference fit.

Exemplarily, the first insulating member 235 may be made of various materials, such as plastic, rubber, or silicone.

In some embodiments, referring to FIG. 4 and FIG. 5 , the end cap assembly 23 further includes a pressure relief member 236, which is mounted on the end cap 231 and 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 when the battery cell 20 is in thermal runaway. The pressure relief member 236 may have a variety of structures, for example, the pressure relief member 236 may be a component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve, or a safety valve.

By interconnecting the end cover 231 and 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 phenomenon of 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.

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

There are many ways in which the first insulating member 235 can be detachably connected to the end cover 231, such as snap connection, bolt connection, or snap connection.

The first insulating member 235 is connected to the end cover 231 in a detachable manner to fix the first insulating member 235 to the end cover 231, thereby facilitating the assembly of the first insulating member 235 and the end cover 231, which helps reduce the difficulty of assembly, and facilitating the later disassembly of the first insulating member 235 and the end cover 231, which helps reduce the difficulty of later maintenance or replacement.

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

The first insulating member 235 is connected to the end cover 231 by a snap-fitting manner, so as to fix the first insulating member 235 on the end cover 231. This structure is simple and easy to manufacture.

In some embodiments, referring to FIG6 and FIG7, and further referring to FIG8 and FIG9, FIG8 is a schematic diagram of the structure of the first insulating member 235 of the end cap assembly 23 provided in some embodiments of the present application, and FIG9 is a schematic diagram of the structure 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 away from the inside of the battery cell 20, the first surface 2312 is provided with a snap-on hole 2313, the first insulating member 235 is convexly provided with a snap-on portion 2353, and the snap-on portion 2353 is snap-fitted with the snap-on hole 2313.

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 .

Exemplarily, 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 .

It should be noted that, in some embodiments, the snap-fit portion 2353 may also be protruded on 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.

By providing a snap-fit portion 2353 on the first insulating member 235, and providing a snap-fit hole 2313 for the snap-fit portion 2353 of the first insulating member 235 to snap into on the first surface 2312 of the end cover 231 facing the connecting member 234, 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.

According to some embodiments of the present application, referring to FIG. 8 and FIG. 9, and further referring to FIG. 10, FIG. 10 is a schematic diagram of 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 clamping 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 clamping portion 2353 has a limiting segment 2353a located in the second hole segment 2313b, and the diameter of the limiting segment 2353a is larger than the aperture of the first hole segment 2313a.

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, the first hole section 2313a penetrates 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.

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

In FIG. 10 , the clamping portion 2353 further includes a connecting segment 2353 b , which is 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 .

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, and the clamping portion 2353 is inserted into the second hole section 2313b to set the limiting section 2353a with a diameter larger than the aperture of the first hole section 2313a, that is, the clamping portion 2353 is inserted into the first The diameter of the portion located in the hole section 2313a and the second hole section 2313b is larger than the diameter 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, which is beneficial to improve the connection stability and connection reliability between the first insulating member 235 and the end cover 231.

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 embodiments of the present application, and Figure 12 is a partial enlarged view of B of the end cap assembly 23 shown in Figure 11. The first insulating member 235 is bonded to the end cap 231 through the bonding layer 237.

Among them, the adhesive layer 237 plays the role of bonding the end cap 231 and the first insulating member 235. The structure of the adhesive layer 237 can be various. For example, the adhesive layer 237 is 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 part of the first insulating member 235 that is bonded to the end cap 231 after partial melting, that is, the part of the first insulating member 235 that is bonded to the end cap 231 after melting is the adhesive layer 237. Exemplarily, 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.

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.

According to some embodiments of the present application, referring to FIG. 13, FIG. 14 and FIG. 15, FIG. 13 is a cross-sectional view of an end cap assembly 23 provided in some other embodiments of the present application, FIG. 14 is a partial enlarged view of the end cap assembly 23 at C shown in FIG. 13, and FIG. 15 is a structural schematic diagram of an end cap 231 of an end cap assembly 23 provided in some 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, and the first surface 2312 is provided with a receiving groove 2314, and the receiving groove 2314 is used to receive at least part of the adhesive layer 237.

The receiving groove 2314 serves to receive the adhesive layer 237, so that the adhesive layer 237 can be provided on the end cover 231. The receiving groove 2314 is used to receive at least part of the adhesive layer 237, that is, the adhesive layer 237 can be received in its entirety in the receiving groove 2314, or part of the adhesive layer 237 can be received in the receiving groove 2314, that is, the adhesive layer 237 can also extend out of the first surface 2312 in the thickness direction X of the end cover.

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.

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.

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

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 .

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 .

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 such a 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.

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 .

At least part 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.

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

According to some embodiments of the present application, referring to FIG. 14 and FIG. 15 , the receiving groove 2314 is an annular groove, and the receiving groove 2314 is arranged around the lead-out hole 2311 .

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

The receiving groove 2314 is arranged around the lead-out hole 2311, that is, the receiving groove 2314 is arranged around the outside of the lead-out hole 2311, that is, the receiving groove 2314 is arranged around the outside of the pole 232. Exemplarily, in FIG. 15, there are two lead-out holes 2311 and two poles 232, and correspondingly, the receiving groove 2314 is arranged around the outside of the two lead-out holes 2311. Of course, in some embodiments, there may be multiple receiving grooves 2314 arranged on the first surface 2312 of the end cover 231, and each receiving groove 2314 is arranged around one lead-out hole 2311.

Exemplarily, 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 discontinuous in the extension direction of the receiving groove 2314, that is, a plurality of docking portions 2354 are provided on the first insulating member 235, and the plurality of docking portions 2354 are arranged at intervals along the extension direction of the receiving groove 2314.

By setting 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 alleviating the phenomenon of the adhesive layer 237 entering the lead-out hole 2311, thereby facilitating the assembly quality of the end cap assembly 23. In addition, by setting the receiving groove 2314 as an annular structure and surrounding the outside of the lead-out hole 2311, the receiving groove 2314 can play a certain blocking role on the electrolyte, thereby reducing the phenomenon of the electrolyte entering the lead-out hole 2311, thereby facilitating reducing the risk of short circuit between the pole 232 and the end cap 231.

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 .

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

By setting the adhesive layer 237 as an annular structure arranged around the lead-out hole 2311, on the one hand, the bonding area between the end cover 231 and the first insulating member 235 can be increased, and on the other hand, the phenomenon of the adhesive layer 237 entering the lead-out hole 2311 can be alleviated. In addition, while the adhesive layer 237 of the annular structure plays a role in connecting the first insulating member 235 and the end cover 231, the adhesive layer 237 surrounding the outside of the lead-out hole 2311 can also play a certain role in blocking the electrolyte, thereby reducing the phenomenon of the electrolyte entering the lead-out hole 2311, which is conducive to reducing the risk of short circuit between the pole 232 and the end cover 231.

In some embodiments, as shown in FIG. 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 .

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 in its extension direction and is connected to each other to form a closed loop, and the accommodating groove 2314 surrounds the outer side of the outlet hole 2311.

15 , there are two outlet holes 2311, and correspondingly, the receiving groove 2314 surrounds the outer sides of the two outlet holes 2311. Of course, in some embodiments, there may be multiple receiving grooves 2314 disposed on the first surface 2312 of the end cover 231, and each receiving groove 2314 is disposed around one outlet hole 2311.

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, which is beneficial to reduce the risk of short circuit between the pole 232 and the end cover 231.

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 some other embodiments of the present application, and Figure 17 is a partial enlarged view of the end cap assembly 23 at D 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.

Among them, the protrusion 2352 and the end cover 231 are interference fit, 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 partially 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.

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 is easy to assemble and is beneficial to improving the production efficiency of the end cover assembly 23.

In some embodiments, refer to FIG. 17, and further refer to FIG. 18 and FIG. 19, FIG. 18 is a schematic structural diagram of an end cap 231 of an end cap assembly 23 provided in some other embodiments of the present application, and FIG. 19 is a cross-sectional view of an end cap 231 of an end cap assembly 23 provided in some other embodiments of the present application. A protrusion 2315 is provided on the wall surface of the outlet hole 2311, and the protrusion 2315 presses the protrusion 2352 along the radial direction of the outlet hole 2311 to achieve an interference fit between the protrusion 2352 and the end cap 231.

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 member 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 produce 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.

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 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.

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.

According to some embodiments of the present application, referring to FIG. 18 and FIG. 19 , a hole 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 .

18, there are four protrusions 2315 disposed on the hole wall 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, there may be two, three, five or six protrusions 2315 disposed on the hole wall of the outlet hole 2311.

In some embodiments, the protrusion 2315 arranged on the hole wall of the lead-out hole 2311 can also be other structures. For example, the protrusion 2315 is an annular structure extending along the circumference of the lead-out hole 2311, and the protrusion 2315 surrounds the outer side of the protrusion 2352 of the first insulating member 235.

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, so that the plurality of protrusions 2315 can cooperate to exert an extrusion effect on the protrusion 2352, adopting 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.

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 the E portion of the end cover 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.

In which, in the thickness direction X of the end cover, a guiding slope 2315a is formed at 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.

Exemplarily, the guiding slope 2315 a is disposed at an acute angle with the hole 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 .

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.

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.

Among them, the first insulating member 235 covers a portion of the lead-out hole 2311, that is, in the thickness direction X of the end cover, the first insulating member 235 blocks a portion 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 a direction away from the interior of the battery cell 20.

By setting the first insulating member 235 to cover a portion 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 a portion 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 of the end cover assembly 23, thereby ensuring 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 of the end cover assembly 23, thereby helping to reduce the risk of leakage in the battery cell 20 having such an end cover assembly 23, thereby improving the safety and service life of the battery cell 20.

According to some embodiments of the present application, as shown in FIG. 6, FIG. 7 and FIG. 8, the first insulating member 235 includes a body portion 2351 and a protrusion 2352. Along the thickness direction X of the end cover, at least a portion of the body portion 2351 is disposed between the connector 234 and the end cover 231. The protrusion 2352 protrudes from the surface of the body portion 2351 facing the end cover 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 detaching from the lead-out hole 2311 in the direction away from the interior of the battery cell 20 along the thickness direction X of the end cover.

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 from the hole wall of the lead-out hole 2311.

The first insulating member 235 is provided with a main body 2351 and a protrusion 2352. The main body 2351 is arranged between the connecting member 234 and the end cover 231 to play the role of insulating and isolating the connecting member 234 and the end cover 231, and the protrusion 2352 is protruded from the surface of the main body 2351 facing the end cover 231, so that at least a 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 limiting effect on the sealing member 233 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 caused by the sealing member 233 being damaged or improperly assembled in subsequent assembly.

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

The protrusion 2352 is arranged around the pole 232, that is, the protrusion 2352 is an annular structure extending along the circumference of the lead-out hole 2311, and the protrusion 2352 surrounds the outer side of the pole 232. The protrusions 2352 are arranged 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.

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 protruding from 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.

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 hole wall of the lead-out hole 2311 through the protrusion 2352, so as to reduce the risk of short circuit between the pole 232 and the hole wall of the lead-out hole 2311; on the other hand, the protrusion 2352 with an annular structure can play a better limiting role on the seal 233 sleeved on the outside of the pole 232, so as to alleviate 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.

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

The main body 2351 and the protrusion 2352 can be made 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 a split structure, and the protrusion 2352 is connected to the main body 2351 by bonding or clamping.

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

According to some embodiments of the present application, as shown in FIG. 4, FIG. 5 and FIG. 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 inside of the battery cell 20, and the current collecting member 238 is connected to the pole 232, and the current collecting member 238 is used to be electrically connected 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 and the end cap 231.

The current collecting member 238 serves to connect the pole 232 and the pole ear 221 of the electrode assembly 22, so as to realize the 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.

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 and the end cover 231. The second insulating member 239 can also be made of various materials, such as rubber, plastic or the like.

A current collecting member 238 is also provided on the side of the end cap 231 facing the inside of the battery cell 20, and the pole 232 can be connected to the electrode assembly 22 through the current collecting member 238, so that the electrical connection between the electrode assembly 22 and the pole 232 can be achieved, and the structure is simple and easy to assemble. In addition, a second insulating member 239 is also provided between the current collecting member 238 and the end cap 231, and the second insulating member 239 can achieve insulation isolation between the current collecting member 238 and the end cap 231, so that the risk of short circuit of the battery cell 20 having such an end cap assembly 23 can be reduced.

According to some embodiments of the present application, the embodiments of the present application further provide a battery cell 20, comprising a shell 21, an electrode assembly 22, and an end cap assembly 23 of any of the above schemes. The shell 21 has an opening 211, and the electrode assembly 22 is accommodated in the shell 21. The end cap 231 covers the opening 211, and along the thickness direction X of the end cap, the first insulating member 235 is arranged on the side of the end cap 231 away from the electrode assembly 22.

According to some embodiments of the present application, a battery 100 is further provided, and the battery 100 includes a battery cell 20 of any of the above schemes.

According to some embodiments of the present application, an electrical device is further provided, comprising a battery cell 20 according to any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device.

The electrical device may be any of the aforementioned devices or systems using the battery cell 20 .

According to some embodiments of the present application, as shown in FIGS. 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, and the lead-out holes 2311 penetrate the end cap 231 along the thickness direction X of the end cap. The two poles 232 are respectively arranged in one lead-out hole 2311. Each seal 233 is sleeved on the outside of a pole 232, and at least part 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 away from the inside of the battery cell 20, and the connector 234 connects the pole 232. The first insulating member 235 includes a body 2351 and two protrusions 2352. Along the thickness direction X of the end cover, at least a portion of the body 2351 is disposed between the connector 234 and the end cover 231 to insulate and isolate the connector 234 and the end cover 231. The protrusions 2352 protrude from the surface of the body 2351 facing the end cover 231. At least a portion of the protrusions 2352 extends into the lead-out hole 2311. Each protrusion 2352 is disposed around the outside of a pole 232. The protrusions 2352 are configured to limit the seal 233 from detaching from the lead-out hole 2311 in the direction away from the inside of the battery cell 20 along the thickness direction X of the end cover. Along the thickness direction X of the end cover, the current collecting member 238 is disposed on the side of the end cover 231 facing the inside of the battery cell 20, and the current collecting member 238 is connected to the pole 232. The current collecting member 238 is used to be electrically connected to the electrode assembly 22. The second insulating member 239 is disposed between the current collecting member 238 and the end cover 231 to insulate and isolate the current collecting member 238 and the end cover 231. In the thickness direction X of the end cover, the end cover 231 has a first surface 2312 away from the inside of the battery cell 20, and the first surface 2312 is provided with a snap-fitting hole 2313. The first insulating member 235 is convexly provided with a snap-fitting portion 2353, and the snap-fitting portion 2353 is snap-fitted with the snap-fitting hole 2313.

According to some embodiments of the present application, the present application also provides a method for manufacturing an end cap assembly 23, referring to FIG. 21, which is a schematic flow chart of a method for manufacturing an end cap assembly 23 provided in some embodiments of the present application, the manufacturing method comprising:

S100: providing an end cover 231, a pole 232, a seal 233 and a first insulating member 235, wherein the end cover 231 is provided with a lead-out hole 2311, and the lead-out hole 2311 penetrates the end cover 231 along a thickness direction X of the end cover;

S200: Connect the first insulating member 235 to the end cover 231, so as 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 provided in some embodiments of the present application);

S300: Sleeve the sealing member 233 on the outer side of the pole 232;

S400: The pole 232 passes 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;

The first insulating member 235 is configured to limit 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 .

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.

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.

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 blocked by the first insulating member 235 when the pole 232 passes through the end cover 231 and the first insulating member 235, thereby alleviating the seal 233 from running off the side or escaping from the lead-out hole 2311 in the thickness direction X of the end cover in a direction away from the interior of the battery cell 20, thereby reducing the seal 233 from being damaged or improperly assembled during the subsequent assembly of the end cover assembly 23, thereby reducing the risk of leakage in the battery cell 20 having such an end cover assembly 23, thereby improving the safety and service life of the battery cell 20.

According to some embodiments of the present application, referring to FIG. 23 , FIG. 23 is a schematic 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:

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

Before step S300: sleeve the seal 233 on the outer side of the pole 232, the manufacturing method of the end cover assembly 23 further includes:

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).

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 .

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 outer side of the pole 232, and then sleeved the seal 233 on the outer side 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, so as 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.

According to some embodiments of the present application, referring to FIG. 25 , FIG. 25 is a schematic 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:

S700: providing a connecting member 234;

After the pole 232 passes through the end cover 231 and the first insulating member 235 in sequence in step S400, the method for manufacturing the end cover assembly 23 further includes:

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 .

Exemplarily, the connector 234 and the pole 232 are riveted to each other. Of course, in other embodiments, the connector 234 and the pole 232 may also be welded or bonded to each other.

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

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

It should be noted that the relevant structure of the end cover assembly 23 manufactured by the manufacturing method provided by the above embodiments can refer to the end cover assembly 23 provided by the above embodiments, and will not be repeated here.

It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

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 at a side of the end cover away from the interior of the battery cell, the connector being connected to the pole; and

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.
The end cap assembly of claim 1, wherein the first insulating member is removably connected to the end cap.
The end cap assembly according to claim 1 or 2, wherein the first insulating member is snap-connected to the end cap.
The end cap assembly according to claim 3, wherein, along the thickness direction of the end cap, the end cap 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 protrudingly provided with a snap-in portion, and the snap-in portion is snap-fitted with the snap-in hole.
The end cover assembly according to claim 4, wherein along the thickness direction of the end cover, the engaging hole comprises a first hole segment and a second hole segment arranged in sequence, the hole diameter of the first hole segment is smaller than the hole diameter 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.
The end cap assembly according to any one of claims 1 to 5, wherein the first insulating member is bonded to the end cap via an adhesive layer.
The end cap assembly according to claim 6, wherein, along the thickness direction of the end cap, the end cap 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.
The end cap assembly according to claim 7, wherein the first insulating member is protrudingly provided with a docking portion, and at least a portion of the docking portion is embedded in the adhesive layer.
The end cap assembly according to claim 8, wherein at least a portion of the docking portion is located within the receiving groove.
The end cover 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.
The end cover 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.
The end cover 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, the receiving groove is an annular groove, and the receiving groove is arranged around the lead-out hole.
The end cap assembly according to any one of claims 1 to 12, wherein the first insulating member has a protrusion extending into the lead-out hole, and the protrusion is interference fit with the end cap.
The end cover assembly according to 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 an interference fit between the protruding portion and the end cover.
The end cover assembly according to claim 14, wherein a plurality of said protrusions are provided on the hole wall surface of said outlet hole, and said plurality of said protrusions are arranged at intervals along the circumference of said outlet hole.
The end cover assembly according to claim 14 or 15, wherein the protrusion is provided with a guiding slope for guiding the protruding portion into the outlet hole.
The end cap assembly according to any one of claims 1-16, wherein the first insulating member covers a portion of the lead-out hole, and the first insulating member is configured to limit the seal from detaching from the lead-out hole in a direction away from the interior of the battery cell along the thickness direction of the end cap.
The end cap assembly of claim 17, wherein the first insulating member comprises:

A main body portion, along the thickness direction of the end cover, at least a portion of the main body portion is disposed between the connecting member and the end cover;

A protrusion protrudes from a surface of the main body facing the end cover, 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.
The end cap assembly of claim 18, wherein the projection is disposed around the pole.
The end cover assembly according to claim 18 or 19, wherein the main body portion and the protrusion portion are an integrally formed structure.
The end cap assembly according to any one of claims 1 to 20, wherein the end cap assembly further comprises:

A current collecting member is disposed on a 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 disposed between the current collecting member and the end cover to insulate and isolate the current collecting member from the end cover.
A battery cell, comprising:

a housing having an opening;

an electrode assembly, contained in the housing; and

According to the end cap assembly as described in any one of claims 1-21, 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.
A battery comprising the battery cell as claimed in claim 22.
An electrical device comprising the battery cell as claimed in claim 22.
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;

Pass 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;

Wherein, the first insulating member is configured to limit 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.
The method for manufacturing an end cap assembly according to claim 25, wherein the method for manufacturing an end cap assembly further comprises:

providing a current collecting member and a second insulating member;

Before the sealing member is sleeved on the outer side of the pole, the method for manufacturing the end cover assembly further includes:

The pole is passed through the current collecting member and the second insulating member in sequence.
The method for manufacturing an end cap assembly according to claim 25 or 26, wherein the method for manufacturing an end cap assembly further comprises:

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.