Battery cell end cap assembly, battery cell, battery, and electric device

Abstract

The application discloses a battery cell end cover assembly, a battery cell, a battery and an electric device. The end cover assembly comprises an end cover, an electrode terminal, a terminal plate and an insulating piece. The end cover is provided with a first through hole; the electrode terminal comprises a terminal body and an annular first protruding part protruding from the outer circumferential surface of the terminal body, at least part of the terminal body is accommodated in the first through hole, and the diameter of the first protruding part is greater than the hole diameter of the first through hole; the terminal plate is arranged on the side of the end cover away from the first protruding part and is connected to the terminal body; the insulating piece is arranged around the terminal body and comprises an insulating body and a blocking part, at least part of the insulating body is arranged between the terminal plate and the end cover, the blocking part protrudes from the side of the insulating body away from the terminal plate, extends into the first through hole and is arranged between the end cover and the terminal body. The end cover assembly of the battery cell of the embodiment of the application improves the safety and stability of the end cover assembly of the battery cell.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to an end cap assembly for a battery cell, a battery cell, a battery, and an electrical device. Background Technology

[0002] With the development of modern society and the increasing awareness of environmental protection, the power sources for more and more electric tools and new energy vehicles are developing towards higher capacity and higher safety, which provides a broad space for the application and development of rechargeable batteries.

[0003] In the development of battery technology, with people paying more attention to the safety and stability of battery use, the reliability and insulation performance of electrode cell end cap assemblies have always been one of the key research focuses in the industry. Summary of the Invention

[0004] In view of the above problems, this application provides an end cap assembly for a battery cell, a battery cell, a battery, and an electrical device, which improves the safety and stability of the end cap assembly for the battery cell.

[0005] In a first aspect, this application provides an end cap assembly for a battery cell, comprising:

[0006] The end cap has a first through hole;

[0007] An electrode terminal includes a terminal body and an annular first protrusion protruding from the outer peripheral surface of the terminal body. At least a portion of the terminal body is accommodated in a first through hole, and the diameter of the first protrusion is larger than the diameter of the first through hole.

[0008] A terminal plate is disposed on the side of the end cover opposite to the first protrusion and connected to the terminal body;

[0009] An insulating element is provided around the terminal body. The insulating element includes an insulating body and a blocking part. At least a portion of the insulating body is disposed between the terminal plate and the end cover. The blocking part protrudes from the side of the insulating body away from the terminal plate, extends into the first through hole, and is disposed between the end cover and the terminal body.

[0010] In the technical solution of this application embodiment, a first through hole is provided in the end cap to extend the terminal body of the electrode terminal outward through the first through hole so as to draw out the electrical energy inside the battery cell; the terminal plate is used to connect with the terminal body to fix the electrode terminal and draw out the electrical energy of the battery cell; an insulating body is provided in the insulating member to realize insulation between the terminal plate and the end cap, and the blocking part protrudes from the insulating body and is provided between the end cap and the terminal body, which can extend the radial distance of the terminal body to the end cap and reduce the risk of short circuit between the metal wire on the terminal body and the end cap.

[0011] In some embodiments, the end cap assembly further includes a seal, the seal including a sealing portion disposed between the end cap and the first protrusion, the sealing portion being sealed to the first protrusion and a blocking portion abutting against the sealing portion. In the above technical solution, the sealing portion forming a sealed connection with the first protrusion improves the sealing performance of the electrode terminal; the blocking portion abutting against the sealing portion effectively prevents the metal wire of the electrode terminal from forming a short circuit with the end cap through the gap between the blocking portion and the sealing portion.

[0012] In some embodiments, the blocking part and the sealing part are interference-fitted. In the above technical solution, the interference fit between the blocking part and the sealing part improves the connection strength between the insulating part and the sealing part in the axial direction of the terminal body, ensures the sealing performance between the insulating part and the sealing part, further prevents the metal wire of the electrode terminal from connecting with the end cap, and improves the safety performance of the end cap assembly.

[0013] In some embodiments, the seal further includes a connecting portion surrounding the terminal body, with the sealing portion surrounding the connecting portion. The above-described solution uses a sealing portion to connect the seal to the terminal body, thereby improving the sealing performance of the terminal body.

[0014] In some embodiments, the seal further includes an abutment portion disposed around the connecting portion; the abutment portion is sandwiched between the connecting portion and the blocking portion in the radial direction of the first through hole. By providing the abutment portion, the connection strength between the sealing portion and the blocking portion in the radial direction of the first through hole is improved, ensuring the sealing performance between the connecting portion and the terminal body, while extending the connection path between the metal wire of the electrode terminal and the end cap, preventing the metal wire from overlapping with the end cap.

[0015] In some embodiments, the abutting portion and the blocking portion are interference-fitted. The above-described solution, by providing an interference fit between the abutting portion and the blocking portion, increases the connection strength between the seal and the insulating component in the radial direction of the first through hole, further preventing the metal wire from overlapping with the end cap, and improving the safety performance of the end cap assembly.

[0016] In some embodiments, the abutment portion is disposed at one end of the connecting portion near the first protrusion and connected to the sealing portion. In the above technical solution, by disposing the abutment portion at one end of the connecting portion near the first protrusion and connecting it to the sealing portion, a connection with the blocking portion can be formed on the inner side of the blocking portion to ensure the radial force balance of the two sides of the blocking portion; by connecting the abutment portion to the sealing portion, manufacturing can be facilitated and the overall integrity of the sealing structure can be improved.

[0017] In some embodiments, the side of the connecting portion opposite to the first protrusion abuts against the terminal plate. In the above-described technical solution, abutting the connecting portion against the terminal plate can cut off the path through which the metal wire of the terminal body passes through the gap between the connecting portion and the terminal plate, thereby improving the safety of the end cap assembly.

[0018] In some embodiments, the side of the connecting portion opposite to the first protrusion is press-fitted with the terminal plate. By providing a press-fit between the connecting portion and the terminal plate, the relative pressure between the seal and the terminal plate is enhanced, preventing the metal wire of the terminal body from forming a short circuit through the connecting portion to the end cap, thus ensuring the safety of the end cap assembly.

[0019] In some embodiments, the connecting portion is recessed on the side facing the terminal body to form a first clearance groove. In the above technical solution, the first clearance groove is provided to provide space for the compression deformation of the connecting portion and to prevent the seal from aging prematurely due to excessive stress.

[0020] In some embodiments, the gap between the connecting part and the insulating member forms a second clearance groove. In the above technical solution, by providing the second clearance groove, space is provided for the compression deformation of the connecting part, preventing the seal from being subjected to excessive force and aging prematurely.

[0021] In some embodiments, the outer peripheral surface of the terminal body is further provided with a recessed first recess, which is spaced apart from the first protrusion in the axial direction of the first through hole. The first recess is used to accommodate at least a portion of the terminal plate. In the above technical solution, by providing the first recess to fix the terminal plate, the stability of the connection between the terminal plate and the terminal body is improved.

[0022] In some embodiments, the terminal block and the terminal body are snap-fit ​​connected. This snap-fit ​​connection improves the ease of connection between the terminal block and the terminal body.

[0023] Secondly, this application provides a battery cell, including

[0024] The shell has an opening;

[0025] As in any embodiment of the first aspect, the end cap assembly covers the opening and encloses the housing to form a receiving cavity;

[0026] An electrode assembly is disposed in the receiving cavity and is electrically connected to the electrode terminals of the end cap assembly.

[0027] Thirdly, this application provides a battery that includes the battery cell of the second aspect.

[0028] Fourthly, this application provides an electrical device that includes the battery of the third aspect, the battery being used to provide electrical energy.

[0029] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0030] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0031] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0032] Figure 2 This is an exploded structural diagram of a battery according to some embodiments of this application;

[0033] Figure 3 for Figure 2 The diagram shows the structure of the battery module.

[0034] Figure 4 This is a schematic diagram of the structure of the end cap assembly provided in some embodiments of this application;

[0035] Figure 5 This is an exploded structural diagram of an end cap assembly provided in some embodiments of this application.

[0036] Figure 6 This is a front view structural schematic diagram of an end cap assembly provided in some embodiments of this application;

[0037] Figure 7 for Figure 6 The diagram shows a cross-sectional view of the end cap assembly at point AA.

[0038] Figure 8 for Figure 6 The enlarged structural diagram of the end cap assembly at point B in the circular frame is shown.

[0039] Figure 9 This is a schematic diagram of the structure of an end cap assembly provided in some other embodiments of this application.

[0040] Detailed Explanation of Reference Numerals

[0041] 1000, vehicles;

[0042] 100. Battery; 200. Controller; 300. Motor;

[0043] 10. Box body; 11. First part; 12. Second part;

[0044] 20. Battery cell; 30. Battery module;

[0045] 21. End cap assembly; 2101. End cap; 2102. Electrode terminal; 2103. Terminal plate; 2104. Insulator; 2105. First through hole; 2106. Terminal body; 2107. First protrusion; 2108. Insulating body; 2109. Blocking part; 2110. Sealing element; 2111. Sealing part; 2112. Connecting part; 2113. Abutting part; 2114. First clearance groove; 2115. Second clearance groove; 2116. First recess; 2117. Second through hole; 2118. Third through hole;

[0046] 22. Housing; 23. Electrode assembly; 24. Pressure relief mechanism; 25. Electrode. Detailed Implementation

[0047] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0048] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0050] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0051] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0052] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0053] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0054] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0055] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0056] The new energy vehicle market is developing rapidly, and as the power source for these vehicles, the safety and reliability of the battery are crucial to the entire system. A battery typically consists of multiple connected cells, with the end cap assembly used to extract the electrical energy from each cell. The end cap assembly usually includes electrode terminals, a terminal plate, and the end cap itself. The electrode terminals and terminal plate are electrically connected to extract the energy, while the end cap is insulated from both to prevent energy leakage. During the connection process, the surfaces of the electrode terminals and end cap inevitably generate some metal wires due to relative friction. During installation, these wires can extend radially along the electrode terminals and overlap with the end cap, creating a short circuit between the electrode terminals and the end cap, potentially leading to a battery cell safety incident.

[0057] Based on the above problems, the inventors have designed an end cap assembly for a battery cell, including an end cap with a first through hole, an electrode terminal, and a terminal plate. The electrode terminal includes a terminal body and an annular first protrusion protruding from the outer circumference of the terminal body. At least a portion of the terminal body is accommodated in the first through hole, and the diameter of the first protrusion is larger than the diameter of the first through hole. Furthermore, an insulating member is provided in the end cap, surrounding the terminal body. The insulating member includes an insulating body and a blocking portion. At least a portion of the insulating body is disposed between the terminal plate and the end cap, and the blocking portion protrudes from the side of the insulating body opposite to the terminal plate, extends into the first through hole, and is disposed between the end cap and the terminal body.

[0058] In the technical solution of this application embodiment, a first through hole is provided in the end cap to extend the terminal body of the electrode terminal outward through the first through hole. The terminal plate is used to connect with the terminal body to fix the electrode terminal and lead out the electrical energy of the battery cell. An insulating body is provided in the insulating member to realize insulation between the terminal plate and the end cap. The blocking part protrudes from the insulating body and is provided between the end cap and the terminal body, which can extend the radial distance of the terminal body to the end cap and reduce the risk of short circuit between the metal wire on the terminal body and the end cap.

[0059] The sampling components disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. Similarly, the sampling components in this application can be used in structures that require a stable connection between conductors and circuit boards, achieving the technical effect of firmly connecting the circuit board and the connecting piece to improve sampling efficiency.

[0060] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0061] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0062] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as the 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 supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0063] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0064] Please refer to Figure 2 , Figure 2 This application provides exploded structural diagrams of the battery 100 according to some embodiments. The battery 100 includes a housing 10 and battery cells (not shown in the figures), with the battery cells housed within the housing 10. The housing 10 provides space for the battery cells, and the housing 10 can have various structures.

[0065] In some embodiments, the housing 10 includes a first portion 11 and a second portion 12, which overlap each other, and together define a receiving space for accommodating a single battery cell. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, with the first portion 11 covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 together define the receiving space; alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0066] In battery 100, there can be multiple battery cells, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells are connected in both series and parallel. Multiple battery cells can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of multiple battery cells is housed in housing 10. Of course, battery 100 can also be formed by first connecting multiple battery cells in series, parallel, or in a mixed manner to form battery modules 30, and then connecting multiple battery modules in series, parallel, or in a mixed manner to form a whole assembly, which is also housed in housing 10.

[0067] Each battery cell can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited to these. The battery cell 20 can also be cylindrical, flat, cuboid, or other shapes.

[0068] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit that makes up a battery. Figure 3 The battery cell 20 includes an end cap assembly 21, a housing 22, an electrode assembly 23, and other functional components.

[0069] End cap assembly 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. In any case, the shape of end cap assembly 21 can be adapted to the shape of housing 22 to fit the housing 22. Optionally, end cap assembly 21 can be made of a material with a certain degree of hardness and strength (such as aluminum alloy), so that end cap assembly 21 is less prone to deformation under pressure and impact, enabling battery cell 20 to have higher structural strength and improved safety performance.

[0070] In some embodiments of this application, the end cap assembly 21 may be provided with functional components such as electrodes 25. Electrodes 25 can be used to electrically connect with electrode assembly 23 for outputting or inputting electrical energy of battery cell 20.

[0071] In some embodiments, the end cap assembly 21 may also be provided with a pressure relief mechanism 24 for releasing internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap assembly 21 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating member may also be provided inside the end cap assembly 21. The insulating member can be used to isolate the electrical connection components within the housing 22 from the end cap assembly 21 to reduce the risk of short circuits. For example, the insulating member may be made of plastic, rubber, etc.

[0072] The housing 22 is a component used to cooperate with the end cap assembly 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap assembly 21 can be independent components. An opening can be provided on the housing 22, and the end cap assembly 21 closes the opening to form the internal environment of the battery cell 20. Alternatively, the end cap assembly 21 and the housing 22 can be integrated. Specifically, the end cap assembly 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap assembly 21 closes the housing 22. The housing 22 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc.

[0073] Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special restrictions on this.

[0074] Electrode assembly 23 is the component in the battery cell 100 where electrochemical reactions occur. The casing 22 may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0075] Please refer to Figures 4 to 9 , Figure 4 This is a schematic diagram of the structure of the end cap assembly 21 provided in some embodiments of this application. Figure 5 This is an exploded view of the end cap assembly 21 provided in some embodiments of this application. Figure 6 This is a front view of the end cap assembly 21 provided in some embodiments of this application; Figure 7 for Figure 6 The diagram shows a cross-sectional view of the end cap assembly 21 at point AA. Figure 8 for Figure 6 An enlarged structural schematic diagram of the end cap assembly 21 at point B in the circular frame; Figure 9 This is a schematic diagram of the structure of the end cap assembly 21 provided in some other embodiments of this application.

[0076] An embodiment of this application provides an end cap assembly 21 for a battery cell 20, including an end cap 2101, an electrode terminal 2102, a terminal plate 2103, and an insulating member 2104. The electrode terminal 2102 is provided with a first through hole 2105. The electrode terminal 2102 includes a terminal body 2106 and an annular first protrusion 2107 protruding from the outer peripheral surface of the terminal body 2106. At least a portion of the terminal body 2106 is accommodated in a first through hole 2105. The diameter of the first protrusion 2107 is larger than the diameter of the first through hole 2105. A terminal plate 2103 is disposed on the side of the end cap 2101 opposite to the first protrusion 2107 and connected to the terminal body 2106. An insulating member 2104 is disposed around the terminal body 2106. The insulating member 2104 includes an insulating body 2108 and a blocking portion 2109. At least a portion of the insulating body 2108 is disposed between the terminal plate 2103 and the end cap 2101. The blocking portion 2109 protrudes from the side of the insulating body 2108 opposite to the terminal plate 2103, extends into the first through hole 2105, and is disposed between the end cap 2101 and the terminal body 2106.

[0077] In the end cap assembly 21, the electrode terminal 2102 is connected to the electrode assembly 23 to draw or introduce electrical energy from the electrode assembly 23. The electrode terminal 2102 can be configured as a column for easy connection to external devices. The electrode terminal 2102 can be manufactured using a metallic material to maintain good conductivity and strength. The terminal plate 2103 can be sheet-shaped, capable of electrically connecting to and fixing the electrode terminal 2102. A second through hole 2117 can be provided on the terminal plate 2103, through which the terminal body 2106 can pass and be fixed to the terminal plate 2103. The terminal plate 2103 can also be made of a metal with a certain strength. The insulating component 2104 can be made of plastic or organic materials. On the end cap 2101, corresponding to the position of the terminal plate 2103, a recessed receiving groove is formed to receive and fix the terminal plate 2103.

[0078] In some embodiments of this application, an insulating member 2104 is also disposed in the receiving groove, and the insulating member 2104 is disposed between the terminal plate 2103 and the end cover 2101 to achieve insulation between the terminal plate 2103 and the end cover 2101. A third through hole 2118 may be provided on the insulating member 2104, through which the terminal body 2106 can pass. In some embodiments, the orthographic projection of the insulating member 2104 on the end cover 2101 completely covers the orthographic projection of the terminal plate 2103 on the end cover 2101, further enhancing the insulation effect between the terminal plate 2103 and the end cover 2101.

[0079] In some embodiments of this application, the terminal body 2106 of the electrode terminal 2102 partially passes through the first through hole 2105, and the first protrusion 2107 is located on one side of the end cap 2101. The outer diameter of the terminal body 2106 can be set to be smaller than the diameter of the first through hole 2105 to form a gap between the first through hole 2105 and the terminal body 2106. The outer diameter of the first protrusion 2107 can be set to be larger than the diameter of the first through hole 2105 to place the first protrusion 2107 on one side of the end cap 2101, preventing the first protrusion 2107 from passing through the first through hole 2105.

[0080] In the technical solution of this application embodiment, a first through hole 2105 is provided in the end cap 2101 to extend the terminal body 2106 of the electrode terminal 2102 outward through the first through hole 2105 to draw out the electrical energy inside the battery cell 20; the terminal plate 2103 is used to connect with the terminal body 2106 to fix the electrode terminal 2102 and draw out the electrical energy of the battery cell 20; an insulating body 2108 is provided in the insulating member 2104 to realize the insulation between the terminal plate 2103 and the end cap 2101, and the blocking part 2109 protrudes from the insulating body 2108 and is provided between the end cap 2101 and the terminal body 2106, which can extend the radial distance between the terminal body 2106 and the end cap 2101 and reduce the risk of short circuit between the metal wire on the terminal body 2106 and the end cap 2101.

[0081] In some embodiments of this application, the insulating member 2104 protrudes circumferentially along one side of the terminal plate 2103 to form a positioning portion (not shown in the figure). By providing the positioning portion, the terminal plate 2103 is positioned, thereby ensuring the stability of the electrode terminal 2102.

[0082] In some embodiments of this application, the end cap assembly 21 further includes a sealing element 2110. The sealing element 2110 includes a sealing portion 2111 disposed between the end cap 2101 and the first protrusion 2107. The sealing portion 2111 is sealed to the first protrusion 2107, and the blocking portion 2109 abuts against the sealing portion 2111. The sealing element 2110 can be made of an insulating material with a certain degree of toughness to achieve the functions of sealing and insulation, such as rubber, silicone, etc.

[0083] In the above technical solution, the sealing part 2111 is provided to form a sealed connection with the first protrusion 2107, thereby improving the sealing performance of the electrode terminal 2102; the blocking part 2109 abuts against the sealing part 2111, effectively preventing the metal wire of the electrode terminal 2102 from forming a short circuit with the end cap 2101 through the gap between the blocking part 2109 and the sealing part 2111.

[0084] In some embodiments of this application, the blocking portion 2109 and the sealing portion 2111 are interference-fitted. This interference fit can be achieved by either the length of the blocking portion 2109 or the sealing portion 2111 being greater than the gap between them. The sealing portion 2111 is compressed and deformed to achieve a certain strength of mutual contact between the two. In the above technical solution, the interference fit between the blocking portion 2109 and the sealing portion 2111 enhances the connection strength between the insulating member 2104 and the sealing member 2110 in the axial direction of the terminal body 2106, ensuring the sealing performance between the insulating member 2104 and the sealing member 2110, further preventing the metal wire of the electrode terminal 2102 from connecting to the end cap 2101, and improving the safety performance of the end cap assembly 21.

[0085] In some embodiments of this application, the seal 2110 further includes a connecting portion 2112 surrounding the terminal body 2106, and the sealing portion 2111 surrounds the connecting portion 2112. In the above-described solution, the sealing portion 2111 connects the seal 2110 to the terminal body 2106, improving the sealing performance of the terminal body 2106.

[0086] like Figure 8 As shown, in some embodiments of this application, the sealing member 2110 further includes an abutment portion 2113 disposed around the connecting portion 2112; in the radial direction of the first through hole 2105, the abutment portion 2113 is sandwiched between the connecting portion 2112 and the blocking portion 2109. By providing the abutment portion 2113, the connection strength between the sealing member 2112 and the blocking portion 2109 in the radial direction of the first through hole 2105 is improved, ensuring the sealing performance between the connecting portion 2112 and the terminal body 2106, while extending the connection path between the metal wire of the electrode terminal 2102 and the end cap 2101, preventing the metal wire from overlapping with the end cap 2101.

[0087] In some embodiments of this application, the abutting portion 2113 and the blocking portion 2109 are interference-fitted. In the above structure, the length of either the blocking portion 2109 or the abutting portion 2113 may be greater than the gap between them. The abutting portion 2113 is compressed and deformed to achieve a certain strength of mutual contact between the two. This solution, by setting the interference fit between the abutting portion 2113 and the blocking portion 2109, increases the connection strength between the sealing member 2110 and the insulating member 2104 in the radial direction of the first through hole 2105, further preventing the metal wire from overlapping with the end cap 2101, and improving the safety performance of the end cap assembly 21.

[0088] In some embodiments of this application, one side of the abutment portion 2113 may extend axially along the terminal body 2106 to connect with the terminal plate 2103. The above structure can enhance the connection strength between the abutment portion 2113 and the blocking portion 2109.

[0089] In some embodiments of this application, the abutment portion 2113 is disposed at one end of the connecting portion 2112 near the first protrusion 2107 and connected to the sealing portion 2111. In the above technical solution, by disposing the abutment portion 2113 at one end of the connecting portion 2112 near the first protrusion 2107 and connecting it to the sealing portion 2111, a connection with the blocking portion 2109 can be formed on the inner side of the blocking portion 2109, so as to ensure the radial force balance of the blocking portion 2109 relative to the two sides; by connecting the abutment portion 2113 to the sealing portion 2111, it is easier to manufacture and improves the overall structure of the sealing member 2110.

[0090] In some embodiments of this application, the side of the connecting portion 2112 opposite to the first protrusion 2107 abuts against the terminal plate 2103. In the above technical solution, abutting the connecting portion 2112 against the terminal plate 2103 can cut off the path through which the metal wire of the terminal body 2106 passes through the gap between the connecting portion 2112 and the terminal plate 2103, thereby improving the safety of the end cover assembly 21.

[0091] In some embodiments of this application, the side of the connecting portion 2112 opposite to the first protrusion 2107 is press-fitted with the terminal plate 2103. By setting the connecting portion 2112 and the terminal plate 2103 to press-fit, the relative pressure between the sealing member 2110 and the terminal plate 2103 is enhanced, preventing the metal wire of the terminal body 2106 from forming a short circuit by connecting the connecting portion 2112 to the end cap 2101, thus ensuring the safety of the end cap assembly 21.

[0092] In some embodiments of this application, the connecting portion 2112 is recessed on the side facing the terminal body 2106 to form a first clearance groove 2114. In the axial direction of the terminal body 2106, one end of the first clearance groove 2114 can extend to the terminal plate 2103, and the other end of the first clearance groove 2114 can extend up to be flush with the first protrusion 2107. In the circumferential direction of the terminal body 2106, the first clearance grooves 2114 can be continuously arranged or spaced out in multiples. In the above technical solution, the first clearance groove 2114 provides space for the compression deformation of the connecting portion 2112, preventing the seal 2110 from aging prematurely due to excessive stress.

[0093] In some embodiments of this application, a second clearance groove 2115 is formed between the connecting portion 2112 and the insulating member 2104. The second clearance groove 2115 is formed by the connecting portion 2112, the abutting portion 2113, and the blocking portion 2109. In the above technical solution, by providing the second clearance groove 2115, space is provided for the compression deformation of the connecting portion 2112, preventing the sealing member 2110 from aging prematurely due to excessive stress.

[0094] In some embodiments of this application, the outer peripheral surface of the terminal body 2106 is further provided with a recessed first recess 2116. The first recess 2116 and the first protrusion 2107 are spaced apart axially from each other in the first through hole 2105. The first recess 2116 is used to accommodate at least a portion of the terminal plate 2103. In the above technical solution, by providing the first recess 2116 to fix the terminal plate 2103, the stability of the connection between the terminal plate 2103 and the terminal body 2106 is improved.

[0095] In some embodiments of this application, the terminal block 2103 is snap-fitted to the terminal body 2106. This snap-fit ​​connection improves the ease of connection between the terminal block 2103 and the terminal body 2106.

[0096] In some embodiments of this application, a portion of the terminal plate 2103 may be disposed in the first recess 2116, wherein the axial extension length of the first recess 2116 in the terminal body 2106 is equal to the thickness of the terminal plate 2103. The above-described technical solution effectively connects the terminal plate 2103 to the terminal body 2106 and prevents relative movement between the terminal plate 2103 and the terminal body 2106, thus ensuring the stability of the terminal body 2106.

[0097] Please refer to Figure 3 According to some embodiments of this application, this application also provides a battery cell 20, including a housing 22, an end cap assembly 21, and an electrode assembly 23. The housing 22 has an opening; the end cap assembly 21, as described in any of the above embodiments, covers the opening and encloses the housing 22 to form a receiving cavity. The electrode assembly 23 is disposed in the receiving cavity and is electrically connected to the electrode terminals 2102 of the end cap assembly 21.

[0098] According to some embodiments of this application, this application also provides a battery 100, including the battery cell 20 described in any of the above embodiments.

[0099] According to some embodiments of this application, this application also provides an electrical device including the battery 100 described in any of the above embodiments, and the battery 100 is used to provide electrical energy to the electrical device. The electrical device can be any of the aforementioned devices or systems that utilize the battery 100.

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

Claims

1. An end cap assembly for a single battery cell, comprising: The end cap has a first through hole; An electrode terminal includes a terminal body and an annular first protrusion protruding from the outer peripheral surface of the terminal body, at least a portion of the terminal body is accommodated in a first through hole, and the diameter of the first protrusion is larger than the diameter of the first through hole; A terminal plate is disposed on the side of the end cover opposite to the first protrusion and connected to the terminal body; An insulating element is disposed around the terminal body. The insulating element includes an insulating body and a blocking portion. At least a portion of the insulating body is disposed between the terminal plate and the end cap. The blocking portion protrudes from the side of the insulating body away from the terminal plate, extends into the first through hole, and is disposed between the end cap and the terminal body. The sealing element includes an abutment portion disposed around the connecting portion, which is held between the connecting portion and the blocking portion in the radial direction of the first through hole.

2. The end cap assembly according to claim 1, wherein, The sealing element includes a sealing portion disposed between the end cap and the first protrusion, the sealing portion being sealed to the first protrusion and the blocking portion abutting against the sealing portion.

3. The end cap assembly according to claim 1 or 2, wherein, The blocking part and the sealing part are interference-fitted.

4. The end cap assembly according to claim 2 or 3, wherein, The seal also includes a connecting portion disposed around the terminal body, the sealing portion being disposed around the connecting portion.

5. The end cap assembly according to claim 1, wherein, The abutting part and the blocking part are interference-fitted.

6. The end cap assembly according to claim 1 or 5, wherein, The abutting portion is located at one end of the connecting portion near the first protrusion and is connected to the sealing portion.

7. The end cap assembly according to any one of claims 4 to 6, wherein, The side of the connecting portion opposite to the first protrusion abuts against the terminal plate.

8. The end cap assembly according to any one of claims 4 to 7, wherein, The side of the connecting portion opposite to the first protrusion is press-fitted with the terminal plate.

9. The end cap assembly according to any one of claims 4 to 8, wherein, The connecting portion is recessed on the side facing the terminal body to form a first clearance groove.

10. The end cap assembly according to any one of claims 4 to 9, wherein, The gap between the connecting part and the insulating part forms a second clearance groove.

11. The end cap assembly according to any one of claims 1 to 10, wherein, The outer peripheral surface of the terminal body is also provided with a first recessed portion, the first recessed portion and the first protrusion are spaced apart in the axial direction of the first through hole, and the first recessed portion is used to accommodate at least part of the terminal plate.

12. The end cap assembly according to any one of claims 1 to 11, wherein, The terminal block is snapped into the terminal body.

13. A single battery cell, characterized in that, include The shell has an opening; The end cap assembly as described in any one of claims 1 to 12, wherein the end cap assembly covers the opening and surrounds the housing to form a receiving cavity; An electrode assembly is disposed in the receiving cavity and electrically connected to the electrode terminals of the end cap assembly.

14. A battery, characterized in that, Includes the battery cell as described in claim 13.

15. An electrical appliance, characterized in that, The electrical device includes the battery as described in claim 14, the battery being used to provide electrical energy.

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