End cover assembly of battery cell, battery cell, battery, and electrical apparatus

Abstract

The present application provides an end cover assembly of a battery cell, a battery cell, a battery, and an electrical apparatus. The end cover assembly comprises an end cover, an electrode terminal, and a fixing member; the main body portion of the electrode terminal covers at least portion of an electrode lead-out hole of the end cover in the thickness direction of the end cover; a limiting portion protrudes out of the outer circumferential surface of the main body portion; the fixing member is connected to the side of the end cover facing away from an electrode assembly; at least portion of the limiting portion is arranged in a recessed portion of the side of the fixing member facing the end cover. According to the described structure, the fixing member is connected to the end cover, and at least portion of the limiting portion of the electrode terminal is arranged in the recessed portion of the fixing member, so that the electrode terminal is in snap-fit connection with the fixing member, the electrode terminal is not prone to fall off from the end cover, and thus, the battery cell has good reliability.

Description

Battery cell end cover assembly, battery cell, battery and electrical device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202322661847.1 filed on September 28, 2023, entitled “End cover assembly of battery cell, battery cell, battery and electrical device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to an end cover assembly of a battery cell, a battery cell, a battery, and an electrical device. Background Art

[0004] Batteries have the advantages of high specific energy and high power density. They are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric airplanes, electric ships, and electric tools.

[0005] As the application scope of batteries continues to expand, people's requirements for battery reliability are also getting higher and higher. How to improve battery reliability has always been the focus of those skilled in the art.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides an end cover assembly of a battery cell, a battery cell, a battery and an electrical device, wherein the battery cell has good reliability.

[0008] In a first aspect, some embodiments of the present application provide an end cap assembly of a battery cell, the end cap assembly of the battery cell comprising an end cap, an electrode terminal and a fixing member, the end cap being provided with an electrode lead-out hole; the electrode terminal being arranged on the end cap, the electrode terminal comprising a main body and a limiting portion protruding from the outer peripheral surface of the main body, the main body covering at least a portion of the electrode lead-out hole in the thickness direction of the end cap, the limiting portion being located on a side of the end cap facing away from the electrode assembly of the battery cell; the fixing member being arranged on a side of the end cap facing away from the electrode assembly and connected to the end cap, a recess being provided on a side of the fixing member facing the end cap, at least a portion of the limiting portion being arranged in the recess.

[0009] In the above structure, since the fixing member is connected to the end cover and at least part of the limiting portion of the electrode terminal is arranged in the recess of the fixing member, the electrode terminal and the fixing member are hooked and connected together, and the electrode terminal is not easy to fall off from the end cover, so that the battery cell has good reliability.

[0010] According to the end cap assembly provided in some embodiments of the present application, the end cap assembly further includes an insulating member, which is connected to the limiting portion and the fixing member and insulates the limiting portion from the fixing member, so that the end cap is not electrically charged.

[0011] According to the end cover assembly provided in some embodiments of the present application, the fixing member includes a connecting portion and a blocking portion that are interconnected, the connecting portion is connected to the end cover, and the blocking portion is located on the outside of the limiting portion away from the end cover and forms a recess for blocking the limiting portion from moving away from the end cover.

[0012] According to the end cap assembly provided in some embodiments of the present application, the surface roughness of the stopper portion is greater than that of the main body portion, the surface roughness of the blocking portion is greater than that of the connecting portion, and the insulating member is connected to the blocking portion and the stopper portion. This structure allows the insulating material to be injected between the blocking portion and the stopper portion, thereby enhancing the connection strength between the insulating member, the blocking portion, and the stopper portion.

[0013] According to the end cap assembly provided in some embodiments of the present application, the minimum thickness of the insulating member between the blocking portion and the limiting portion is 0.5 mm, so that the insulating member between the blocking portion and the limiting portion has good insulation performance.

[0014] According to the end cover assembly provided in some embodiments of the present application, the blocking portion is bent to form a recess, and the limiting portion is bent toward the recess and extends into the recess, so that the limiting portion can be connected to the blocking portion by a hook after convenient processing.

[0015] According to the end cover assembly provided in some embodiments of the present application, the bending angle range of the limiting portion relative to the end cover is set to 15° to 75°, so that the hook of the limiting portion and the blocking portion is stable, and the limiting portion is not easy to fall out of the recess, thereby improving the reliability of the hook connection between the limiting portion and the blocking portion.

[0016] According to the end cover assembly provided in some embodiments of the present application, the limiting portion is formed with a convex portion protruding toward the blocking portion, and at least part of the convex portion extends into the recessed portion. By allowing at least part of the convex portion to extend into the recessed portion, the limiting portion and the blocking portion are connected by a hook.

[0017] According to the end cover assembly provided in some embodiments of the present application, the edge of the limiting portion away from the main body is provided with a rounded corner, so that the edge of the limiting portion away from the main body is not easy to cause cutting to the insulating part, which is beneficial to improving the service life of the insulating part.

[0018] In a second aspect, some embodiments of the present application further provide a battery cell, which includes the end cover assembly provided by any of the aforementioned technical solutions.

[0019] On the third aspect, some embodiments of the present application further provide a battery, which includes the battery cell provided by the aforementioned technical solution.

[0020] In a fourth aspect, some embodiments of the present application further provide an electrical device, which includes the battery provided by the aforementioned technical solution, and the battery is used to provide electrical energy.

[0021] The technical solutions provided by the embodiments of the present disclosure bring at least the following beneficial effects:

[0022] Some embodiments of the present application provide an end cap assembly for a battery cell, the end cap assembly comprising an end cap, an electrode terminal, and a fixing member. The main body of the electrode terminal covers at least a portion of the electrode lead-out hole of the end cap in the thickness direction of the end cap, the outer peripheral surface of the main body protrudes with a limiting portion, the fixing member is connected to the side of the end cap facing away from the electrode assembly, and at least a portion of the limiting portion is disposed in a recessed portion on the side of the fixing member facing the end cap. In the above structure, because the fixing member is connected to the end cap and at least a portion of the limiting portion of the electrode terminal is disposed in the recessed portion of the fixing member, the electrode terminal and the fixing member are hooked and connected together, and the electrode terminal is not easily detached from the end cap, thereby providing good reliability of the battery cell.

[0023] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0025] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0026] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0027] FIG3 is an exploded view of a battery cell provided in some embodiments of the present application;

[0028] FIG4 is a cross-sectional view of an end cap assembly of a battery cell provided in some embodiments of the present application;

[0029] FIG5 is an exploded view of an end cap assembly of a battery cell provided in some embodiments of the present application;

[0030] FIG6 is a cross-sectional view of the section AA in FIG5 ;

[0031] FIG7 is a schematic diagram of a hook between an electrode terminal and a fixing member in an end cap assembly of a battery cell provided in some embodiments of the present application.

[0032] The accompanying drawings in the specific implementation manner are as follows:

[0033] 1. End cap assembly; 11. End cap; 111. Electrode lead-out hole; 12. Electrode terminal; 121. Main body; 122. Limiting portion; 1221. Protrusion; 1222. Rounded corner; 13. Fixing member; 131. Connecting portion; 132. Blocking portion; 1321. Recessed portion; 14. Insulating member; 15. Insulating layer; 16. Sealing member; 161. Positioning structure; 2. Shell; 10. Box; 101. First box; 102. Second box; 20. Battery cell; 201. Electrode assembly; 202. Outer shell; 203. Cavity; 1000. Vehicle; 100. Battery; 200. Controller; 300. Motor. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0036] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0038] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0039] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0040] In the embodiments of this application, "parallel" includes not only absolute parallelism but also approximately parallelism as commonly understood in engineering practice. Similarly, "perpendicular" also includes not only absolute perpendicularity but also approximately perpendicularity as commonly understood in engineering practice. For example, if the angle between two directions is 85°-90°, they are considered perpendicular; if the angle between two directions is 0°-5°, they are considered parallel.

[0041] The term "plurality" used in this application refers to two or more (including two).

[0042] Currently, judging by market developments, batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace.

[0043] 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.

[0044] The battery cell may be a secondary battery cell. A secondary battery cell refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0045] The battery cells can be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0046] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0047] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0048] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0049] Since the battery cells in the battery generate gas during the charge and discharge process, these gases will accumulate in the battery cells, causing the internal pressure of the battery cells to increase, which can easily cause the electrode terminals to fall off from the end caps, affecting the use of the battery cells.

[0050] In order to reduce the risk of electrode terminals falling off and improve the reliability of battery cells, some embodiments of the present application provide an end cap assembly for a battery cell, wherein the end cap assembly includes an end cap, an electrode terminal, and a fixing member. The main body of the electrode terminal covers at least a portion of the electrode lead-out hole of the end cap in the thickness direction of the end cap, and a limiting portion is protruded from the outer peripheral surface of the main body. The fixing member is connected to the side of the end cap facing away from the electrode assembly, and at least a portion of the limiting portion is disposed in a recess provided on the side of the fixing member facing the end cap. In the above structure, since the fixing member is connected to the end cap, and at least a portion of the limiting portion of the electrode terminal is disposed in the recess of the fixing member, the electrode terminal and the fixing member are hooked and connected together, and the electrode terminal is not easily detached from the end cap, so that the battery cell has good reliability.

[0051] The end cap assembly of the battery cell described in the embodiments of this application is applicable to battery cells, batteries, and electrical devices using the batteries. The battery cell can be used in, but is not limited to, batteries. It can also be used in vehicles, aircraft, ships, electronic equipment, power tools, and other products, thereby improving the reliability of these products.

[0052] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be fuel-powered, gas-powered, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles. Spacecraft include aircraft, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0053] 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.

[0054] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0055] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0056] Please refer to Figure 2, which is an exploded view of the battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, and the battery cell 20 is accommodated in the housing 10. Among them, the housing 10 is used to provide a storage space for the battery cell 20. There can be multiple battery cells 20 in the battery 100, and the multiple battery cells 20 can be connected in series, in parallel, or mixed. Mixed means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or mixed together, and then the whole formed by the multiple battery cells 20 is accommodated in the housing 10; of course, the battery 100 can also be a battery module formed by first connecting multiple battery cells 20 in series, in parallel, or mixed, and then the multiple battery modules are connected in series, in parallel, or mixed to form a whole, and accommodated in the housing 10.

[0057] The housing 10 may include a first housing 101 and a second housing 102. The first housing 101 and the second housing 102 cover each other to define a storage space for accommodating the battery cells 20. The first housing 101 and the second housing 102 may have various shapes, such as a rectangular parallelepiped, a cylinder, etc. The first housing 101 may be a hollow structure with one side open, and the second housing 102 may also be a hollow structure with one side open. The open side of the second housing 102 covers the open side of the first housing 101, thereby forming the housing 10 with a storage space.

[0058] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for achieving electrical connection between the plurality of battery cells 20 .

[0059] Each battery cell 20 may be a secondary battery or a primary battery, and 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.

[0060] In some embodiments of the present application, as shown in FIG3 , a battery cell 20 includes a housing 202 and an electrode assembly 201, with the electrode assembly 201 housed within the housing 202. The housing 202 may be a wall structure disposed on the periphery of the battery cell 20, which may form a cavity 203 for accommodating the electrode assembly 201 and other components of the battery cell 20, as well as an electrolyte. The electrode assembly 201, as a component housed within the housing 202, is in contact with the electrolyte, allowing active ions (e.g., lithium ions) to be conducted between the electrode assembly 201 and the electrolyte.

[0061] The housing 202 includes an end cover assembly 1 and a shell 2 . The shell 2 has an opening, and the end cover 11 covers the opening.

[0062] Some embodiments of the present application provide an end cap assembly 1 of a battery cell 20, as shown in Figure 4, the end cap assembly 1 includes an end cap 11, an electrode terminal 12 and a fixing member 13, the end cap 11 is provided with an electrode lead-out hole 111, the electrode terminal 12 is arranged on the end cap 11, the electrode terminal 12 includes a main body 121 and a limiting portion 122 protruding from the outer peripheral surface of the main body 121, the main body 121 covers at least part of the electrode lead-out hole 111 in the thickness direction of the end cap 11, the limiting portion 122 is located on the side of the end cap 11 away from the electrode assembly 201 of the battery cell 20, the fixing member 13 is arranged on the side of the end cap 11 away from the electrode assembly 201 and is connected to the end cap 11, the side of the fixing member 13 facing the end cap 11 is provided with a recess 1321, and at least part of the limiting portion 122 is arranged in the recess 1321.

[0063] The end cap 11 may be a component of the end cap assembly 1 used to cover the opening of the housing 2. Together with the housing 2, the end cap 11 forms a cavity 203 for accommodating components such as the electrode assembly 201 and the electrolyte. For example, the end cap 11 may be connected to the opening of the housing 2 by welding, so that the materials of the end cap 11 and the housing 2 are fused together, which helps to improve the sealing of the battery cell 20.

[0064] The electrode lead-out hole 111 can be a through-hole structure opened on the end cap 11, which is used to install the electrode terminal 12. The electrode lead-out hole 111 can communicate with the cavity 203 inside the battery cell 20, so that the electrode terminal 12 can be electrically connected to the electrode assembly 201 in the cavity 203. For example, the electrode lead-out hole 111 can be formed by a machining process such as milling or drilling, or can be formed simultaneously with the end cap 11 through an integral molding process such as stamping.

[0065] The electrode terminal 12, as a component provided on the end cap 11, can be used to electrically connect to an external power device or charging device of the battery cell 20 to facilitate charging and discharging of the battery cell 20. The electrode terminal 12 may include, but is not limited to, a columnar structure, and those skilled in the art may configure it according to actual circumstances.

[0066] The main body 121 may be the main structure of the electrode terminal 12. By covering at least a portion of the electrode lead-out hole 111 in the thickness direction of the end cap 11, it facilitates electrical connection between the electrode assembly 201 in the cavity 203 and the electrode terminal 12 via an electrical connector. The stopper 122 may be a structure protruding from the main body 121. By protruding from the outer circumferential surface of the main body 121 and being located on the side of the end cap 11 facing away from the electrode assembly 201, it prevents the electrode terminal 12 from falling into the cavity 203.

[0067] The fixing member 13 may be a component for fixing the electrode terminal 12, connecting the electrode terminal 12 to the end cap 11, thereby reducing the possibility of the electrode terminal 12 falling off the end cap 11. The fixing member 13 is disposed on the side of the end cap 11 facing away from the electrode assembly 201 and connected to the end cap 11. By providing a recess 1321 on the side of the fixing member 13 facing the end cap 11, at least a portion of the limiting portion 122 is disposed within the recess 1321, so that the limiting portion 122 and the fixing member 13 are hooked and connected together, the connection between the electrode terminal 12 and the fixing member 13 is firm and not easily disengaged, thereby preventing the electrode terminal 12 from falling off the end cap 11, thereby helping to improve the reliability of the battery cell 20.

[0068] In the above structure, since the fixing member 13 is connected to the end cover 11, and at least a portion of the limiting portion 122 of the electrode terminal 12 is disposed in the recess 1321 of the fixing member 13, the electrode terminal 12 and the fixing member 13 are hooked and connected together, so that the connection between the electrode terminal 12 and the fixing member 13 is firm and not easy to disengage, and the electrode terminal 12 is not easy to fall off from the end cover 11, so that the battery cell 20 has good reliability.

[0069] In some embodiments, the end cap assembly 1 further includes an insulating member 14 , which is connected to the limiting portion 122 and the fixing member 13 and insulates the limiting portion 122 from the fixing member 13 .

[0070] The insulating member 14 may be a component for insulating the limiting portion 122 from the fixing member 13. The insulating member 14 fills the recess 1321 and is connected between the limiting portion 122 and the fixing member 13. It can apply a force to the limiting portion 122 and the fixing member 13, thereby improving the firmness of the limiting portion 122 in the recess 1321 and ensuring a secure connection between the limiting portion 122 and the fixing member 13. It also insulates the limiting portion 122 from the end cap 11, rendering the end cap 11 electrically neutral.

[0071] In some embodiments, the insulating member 14 can be formed by solidifying a plastic material, which is in a fluid state at a certain temperature, so that the plastic material can be easily filled between the limiting portion 122 and the fixing member 13. After the plastic material is solidified into the insulating member 14, the limiting portion 122 and the fixing member 13 are connected, and the limiting portion 122 and the fixing member 13 are insulated and isolated.

[0072] For example, the insulating member 14 may be covered by the limiting portion 122 and the blocking portion 132 , so that more material is used for the insulating member 14 , which is beneficial to improving the overall structural strength of the insulating member 14 .

[0073] In some embodiments, as shown in FIG. 5 , the fixing member 13 includes a connecting portion 131 and a blocking portion 132 connected to each other. The connecting portion 131 is connected to the end cover 11 , and the blocking portion 132 is located outside the limiting portion 122 away from the end cover 11 and forms a recess 1321 .

[0074] The connecting portion 131 and the blocking portion 132 are two parts connected to each other on the fixing member 13. The connecting portion 131 is used to connect to the end cover 11, and the blocking portion 132 extends toward the outer side of the limiting portion 122 away from the end cover 11 and forms a recess 1321, which is used to block the limiting portion 122 from moving away from the end cover 11.

[0075] For example, the connection portion 131 can be connected to the side of the end cover 11 away from the electrode assembly 201 by welding, so that the connection between the connection portion 131 and the end cover 11 is firm, and the fixing member 13 can provide a large force to prevent the electrode terminal 12 from falling off.

[0076] In some embodiments, the surface roughness of the limiting portion 122 is greater than that of the main body 121 , the surface roughness of the blocking portion 132 is greater than that of the connecting portion 131 , and the insulating member 14 is connected to the blocking portion 132 and the limiting portion 122 .

[0077] By setting the roughness of the surface of the limiting portion 122 to be greater than the roughness of the surface of the main body 121, and setting the roughness of the surface of the blocking portion 132 to be greater than the roughness of the surface of the connecting portion 131, after the insulating material is filled between the blocking portion 132 and the limiting portion 122, the effect on the surface of the blocking portion 132 and the surface of the limiting portion 122 is stronger, which is beneficial to improving the connection strength between the insulating part 14 and the blocking portion 132 and the limiting portion 122.

[0078] In some embodiments, the minimum thickness of the insulating member 14 between the blocking portion 132 and the limiting portion 122 is 0.5 mm.

[0079] The minimum thickness of the insulating member 14 between the blocking portion 132 and the limiting portion 122 is 0.5 mm, which may mean that the thickness of the insulating member 14 between the blocking portion 132 and the limiting portion 122 is greater than or equal to 0.5 mm. By setting the thickness of the insulating member 14 between the blocking portion 132 and the limiting portion 122 to be greater than or equal to 0.5 mm, the insulating member 14 between the blocking portion 132 and the limiting portion 122 has good insulation performance. Exemplarily, the thickness of the insulating member 14 between the blocking portion 132 and the limiting portion 122 can be set to 0.5 mm, 0.8 mm, or 1.2 mm. In some embodiments, the thickness of the insulating member 14 between the blocking portion 132 and the limiting portion 122 can also be set to other values ​​so that the insulating member 14 between the blocking portion 132 and the limiting portion 122 meets the insulation performance requirements.

[0080] In some embodiments, as shown in FIG. 6 , the blocking portion 132 is bent to form a recessed portion 1321 , and the limiting portion 122 is bent toward the recessed portion 1321 and extends into the recessed portion 1321 .

[0081] By bending the blocking portion 132, the recess 1321 is formed on the blocking portion 132 of the fixing member 13, making it easier to form the recess 1321. The limiting portion 122 is bent toward the recess 1321 by bending the edge of the limiting portion 122 away from the main body 121 toward the recess 1321 and extending into the recess 1321. This allows the limiting portion 122 to be easily processed and hooked to the blocking portion 132.

[0082] In some embodiments, the bending angle range of the limiting portion 122 relative to the end cover 11 is set to be 15° to 75°.

[0083] By setting the bending angle range of the limiting portion 122 relative to the end cover 11 to 15° to 75°, the hook connection between the limiting portion 122 and the blocking portion 132 is stable, and the limiting portion 122 is not easy to fall out of the recess 1321, thereby improving the reliability of the hook connection between the limiting portion 122 and the blocking portion 132.

[0084] For example, the angle at which the limiting portion 122 is bent relative to the end cap 11 can be set to 30°, 45°, or 60°, so that the locking of the limiting portion 122 and the blocking portion 132 is stable and the limiting portion 122 is not easily dislodged from the recess 1321. In some embodiments, the angle at which the limiting portion 122 is bent relative to the end cap 11 can also be set to other values ​​to ensure stable locking of the limiting portion 122 and the blocking portion 132.

[0085] In some embodiments, as shown in FIG. 7 , the limiting portion 122 is formed with a convex portion 1221 convex toward the blocking portion 132 , and at least a portion of the convex portion 1221 extends into the concave portion 1321 .

[0086] In addition to being formed by bending, recessed portion 1321 can also be a recessed structure provided on the surface of blocking portion 132 facing stopper 122, which is used to accommodate at least a portion of stopper 122. For example, recessed portion 1321 can be formed by machining the surface of blocking portion 132 facing stopper 122, such as milling, to remove material. Protruding portion 1221 can be a raised structure on the surface of stopper 122 facing stopper 132. By allowing at least a portion of protruding portion 1221 to extend into recessed portion 1321, stopper 122 and stopper 132 can be connected by hook.

[0087] In some embodiments, as shown in FIG. 6 , a rounded corner 1222 is formed on an edge of the limiting portion 122 away from the main body 121 .

[0088] By providing a rounded corner 1222 at the edge of the limiting portion 122 away from the main body 121 , the edge of the limiting portion 122 away from the main body 121 is less likely to cause damage to the insulating member 14 , which is beneficial to improving the life of the insulating member 14 .

[0089] In some embodiments, the end cap assembly 1 further includes an insulating layer 15 , the end cap 11 includes a first surface and a second surface spaced apart in its thickness direction, the connecting portion 131 is connected to the first surface, and the insulating layer 15 is disposed on the second surface.

[0090] The first surface and the second surface are two side surfaces of the end cover 11 that are relatively spaced apart in the thickness direction thereof, with the material forming the end cover 11 being located between the two. The first surface is the side facing away from the electrode assembly 201, and the second surface is the side facing the electrode assembly 201.

[0091] The insulating layer 15 is an insulating structural layer in the end cap assembly 1 , which is used to insulate and isolate the end cap 11 from components such as the electrode assembly 201 inside the battery cell 20 , thereby reducing the possibility of leakage of the end cap 11 .

[0092] For example, the insulating layer 15 can be formed of a plastic material, which provides excellent insulation and corrosion resistance. In some embodiments, the insulating layer 15 can be formed by curing the plastic material. When the plastic material is in a fluid state at a certain temperature, the plastic material can be easily applied to the second surface and fill the gap between the electrode terminal 12 and the inner wall of the electrode lead-out hole 111, thereby reducing the outflow of electrolyte from the cavity 203 of the battery cell 20.

[0093] In some embodiments, the end cover assembly 1 further includes a seal 16 , which is sandwiched between the limiting portion 122 and the end cover 11 .

[0094] The seal 16 can be a rubber sealing ring with good elasticity. When the seal 16 is clamped between the main body 121 and the end cover 11, the seal 16 will elastically deform and seal against the main body 121 and the end cover 11, making it difficult for the electrolyte in the cavity 203 of the battery cell 20 to flow out.

[0095] For example, the seal 16 is provided with a positioning structure 161, which is inserted into the electrode lead-out hole 111. The positioning structure 161 can be a structure for positioning the seal 16. When installing the seal 16, the positioning structure 161 can be first inserted into the electrode lead-out hole 111 to position the seal 16, and then the seal 16 can be clamped between the limit portion 122 and the end cap 11, making operation convenient.

[0096] Some embodiments of the present application further provide a battery cell 20 , which includes the end cover assembly 1 provided by any of the above technical solutions.

[0097] Some embodiments of the present application further provide a battery 100 , which includes the battery cell 20 provided by the above technical solution.

[0098] Some embodiments of the present application further provide an electrical device, which includes the battery 100 provided by the above technical solution, and the battery 100 is used to provide electrical energy.

[0099] Some embodiments of the present application provide an end cap assembly 1, as shown in Figure 6, the end cap assembly 1 includes an end cap 11, an electrode terminal 12, a fixing member 13 and an insulating member 14, the electrode terminal 12 includes a main body 121 and a limiting portion 122 protruding from the outer peripheral surface of the main body 121, the fixing member 13 includes a connecting portion 131 and a blocking portion 132 connected to each other, the main body 121 covers at least a portion of the electrode lead-out hole 111 in the end cap 11 in the thickness direction of the end cap 11, the connecting portion 131 is connected to the side of the end cap 11 away from the electrode assembly 201, the blocking portion 132 is bent to form a recessed portion 1321, the limiting portion 122 is located between the end cap 11 and the blocking portion 132, and the edge of the limiting portion 122 away from the main body 121 is bent toward the recessed portion 1321 and extends into the recessed portion 1321, the insulating member 14 is connected between the limiting portion 122 and the blocking portion 132 and insulates the limiting portion 122 from the blocking portion 132. The roughness of the surface of the limiting portion 122 is greater than that of the main body 121 , and the roughness of the surface of the blocking portion 132 is greater than that of the connecting portion 131 .

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An end cap assembly of a battery cell, comprising: An end cap having an electrode lead-out hole; an electrode terminal, arranged on the end cover, the electrode terminal comprising a main body and a stopper protruding from an outer peripheral surface of the main body, the main body covering at least a portion of the electrode lead-out hole in a thickness direction of the end cover, and the stopper being located on a side of the end cover away from the electrode assembly of the battery cell; A fixing member is arranged on a side of the end cover away from the electrode assembly and connected to the end cover. A recess is provided on a side of the fixing member facing the end cover, and at least a part of the limiting portion is arranged in the recess.

2. The end cap assembly according to claim 1, wherein: The end cover assembly further includes an insulating member, which is connected to the limiting portion and the fixing member and insulates the limiting portion from the fixing member.

3. The end cap assembly according to claim 2, wherein: The fixing member comprises a connecting portion and a blocking portion which are connected to each other, wherein the connecting portion is connected to the end cover, and the blocking portion is located at an outer side of the limiting portion away from the end cover and forms the recess.

4. The end cap assembly according to claim 3, wherein: The roughness of the surface of the limiting portion is greater than that of the main body portion, the roughness of the surface of the blocking portion is greater than that of the connecting portion, and the insulating member is connected to the blocking portion and the limiting portion.

5. The end cap assembly according to claim 4, wherein: The minimum thickness of the insulating member between the blocking portion and the limiting portion is 0.5 mm.

6. The end cap assembly according to any one of claims 3 to 5, wherein: The blocking portion is bent to form the recessed portion, and the limiting portion is bent toward the recessed portion and extends into the recessed portion.

7. The end cap assembly according to claim 6, wherein: The bending angle range of the limiting portion relative to the end cover is set to 15° to 75°.

8. The end cap assembly according to any one of claims 3 to 7, wherein: The limiting portion is formed with a convex portion protruding toward the blocking portion, and at least a portion of the convex portion extends into the concave portion.

9. The end cap assembly according to any one of claims 1 to 8, wherein: The edge of the limiting portion away from the main body portion is provided with a rounded corner.

10. A battery cell comprising the end cap assembly according to any one of claims 1 to 9.

11. A battery comprising the battery cell according to claim 10.

12. An electrical device comprising the battery according to claim 11, wherein the battery is used to provide electrical energy.

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