End cap assembly, battery, and powered device

Abstract

Provided are an end cover assembly, a battery, and an electric device. The end cover assembly (21) for a battery comprises an end cover (211), a gas permeable valve (215), and a protective patch (217). The end cover (211) has a first side for facing an interior of the battery and a second side opposite the first side, and comprises a first channel (2113) communicating the first side and the second side; the gas permeable valve (215) comprises a gas permeable membrane (2152) in gas communication with the first channel (2113), the gas permeable membrane (2152) comprising a gas permeable portion (2152A) open toward the second side of the end cover (211); and the protective patch (217) is disposed on the second side of the end cover (211) and covers the gas permeable portion (2152A). The battery comprises the end cover assembly. The electric device comprises the battery.

Description

Technical Field

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

[0002] In related technologies, to balance the internal and external pressures of a battery cell and protect internal components, a vent valve can be installed on the end cap assembly of the battery cell. Under the influence of the pressure difference, the internal and external gases of the battery cell pass through the gas channel of the vent valve, through the vent membrane, and undergo gas compensation to maintain the pressure balance of the internal and external gases of the battery cell.

[0003] In the process of realizing this disclosure, the inventors discovered that during the battery cell assembly process, foreign matter such as welding slag generated in the welding process and liquid spraying during the liquid injection process can contaminate the vent valve and affect the venting effect. Summary of the Invention

[0004] This disclosure provides an end cap assembly, a battery, and an electrical device designed to provide protection for a vent valve and improve its venting performance.

[0005] This disclosure provides a first aspect of an end cap assembly. The end cap assembly is for a battery and includes an end cap, a vent valve, and a protective patch. The end cap has a first side facing the interior of the battery and a second side opposite to the first side, and includes a first channel communicating between the first side and the second side. The vent valve includes a vent membrane in gas communication with the first channel. The vent membrane includes a vent portion open toward the second side of the end cap. The protective patch is disposed on the second side of the end cap and covers the vent portion.

[0006] According to the end cap assembly of this disclosure, since a protective patch is provided, the protective patch covers the venting portion of the venting membrane facing the second side of the end cap, which helps to prevent welding slag or electrolyte from contaminating the venting membrane. Therefore, the venting membrane of the venting valve in the end cap assembly can be protected by the protective patch, improving the venting effect of the venting valve, enabling the venting valve to better realize its function of balancing the internal and external pressure of the battery cell and protecting the internal components.

[0007] In some embodiments of the end cap assembly, the protective patch has a second channel communicating with the gas of the breathable membrane between it and the end cap.

[0008] Because there is a second channel between the patch body and the end cap that communicates with the gas in the venting membrane, the second channel allows the airflow through the venting membrane via the venting valve to smoothly enter and exit the battery cell.

[0009] In some embodiments of the end cap assembly, the end cap includes a vent valve mounting groove, the vent valve is located in the vent valve mounting groove, a first channel is disposed on the bottom wall of the vent valve mounting groove, and a second channel communicates with the vent valve mounting groove. The opening of the vent valve mounting groove is disposed on a first side of the end cap, or the opening of the vent valve mounting groove is disposed on a second side of the end cap.

[0010] Installing the vent membrane via the valve plate helps to protect and support the vent membrane, reducing the adverse effects caused by setting the first channel on the end cap. By placing the valve plate and vent membrane of the vent valve in the vent valve mounting groove, the vent valve can be installed without affecting the vent valve's air permeability, and its installation should not occupy the thickness of the end cap as much as possible, which helps to reduce the overall height of the end cap assembly and the battery.

[0011] In some embodiments of the end cap assembly, the vent valve further includes a valve plate mounted on the end cap and having a third channel penetrating both sides of the valve plate. A vent membrane is fixed to the valve plate and covers the third channel. The vent valve mounting groove is a stepped groove, comprising a first groove segment and a second groove segment. The first groove segment is close to the bottom wall of the vent valve mounting groove, and the vent membrane is located within the first groove segment with a gap between it and the bottom wall. The second groove segment connects to the first groove segment, forming a stepped surface at the connection point. The valve plate is located within the second groove segment and abuts against the stepped surface.

[0012] The above configuration facilitates fluid communication between the breathable membrane and the first and third channels, and helps the breathable membrane stably achieve its function of balancing the internal and external pressure of the battery cell.

[0013] In some embodiments of the end cap assembly, the height of the first groove segment is 0.1-0.5 mm greater than the thickness of the breathable membrane; and / or the height of the second groove segment is equal to or within 0.5 mm greater than the thickness of the valve plate.

[0014] Properly setting the relationship between the height of the first groove section and the thickness of the breathable membrane helps maintain unobstructed flow between the breathable membrane and the first channel. Similarly, properly setting the relationship between the height of the second groove section and the thickness of the valve plate helps reduce the extra space occupied by the breathable valve beyond the end plate thickness, and also helps minimize the adverse effects on the end plate caused by machining the breathable valve mounting groove.

[0015] In some embodiments of the end cap assembly, the end cap includes an end cap body, and a vent valve mounting groove is disposed on the end cap body. The end cap further includes: a boss disposed on the end cap body and protruding toward a second side of the end cap, and a second channel including a connecting groove or connecting hole disposed on the boss; and / or a vent groove disposed on the end cap body, located on the second side of the end cap and communicating with the vent valve mounting groove, and the second channel including the vent groove.

[0016] By providing a boss and providing a connecting groove or connecting hole on the boss as at least part of the second channel, or by providing a ventilation groove as at least part of the second channel, the second channel can be realized through a simple structure and processing method, and the ventilation function of the breathable membrane can be maintained without being affected by the protective patch.

[0017] In some embodiments of the end cap assembly, the height of the boss is 0.1-0.5 mm; and / or the boss is located outside the vent valve mounting groove and the distance between the edge of the boss near the vent valve mounting groove and the edge of the vent valve mounting groove is 0.5-3 mm.

[0018] Setting the height of the boss appropriately helps to minimize the height occupied by the vent valve while ensuring smooth airflow through the vent valve between the inside and outside of the battery cell. Properly positioning the boss relative to the vent valve mounting slot facilitates easy assembly and maintenance of the vent valve, for example, by providing operating space for laser welding when installing the valve plate.

[0019] In some embodiments of the end cap assembly, the depth of the vent groove is 0.05-0.3 mm; and / or the distance between the edge of the vent groove located on the outer side of the protective patch and the edge of the protective patch is 0.1-0.5 mm.

[0020] Properly setting the depth of the venting groove and its distance from the protective patch helps to ensure smooth airflow inside and outside the battery cell when passing through the venting valve.

[0021] In some embodiments of the end cap assembly, the protective patch includes a patch body covering the vent and a fixing adhesive layer, the fixing adhesive layer being disposed on the side of the patch body facing the end cap, and the patch body being adhered to the second side of the end cap by the fixing adhesive layer.

[0022] The protective patch consists of a patch body and a fixing adhesive layer. The fixing adhesive layer securely connects the patch body, facilitating quick and secure installation of the protective patch.

[0023] In some embodiments of the end cap assembly, a retaining adhesive layer is attached to a portion of the patch body, wherein the portion of the patch body without the retaining adhesive layer is transparent; and / or the portion of the patch body with the retaining adhesive layer and / or the retaining adhesive layer is colored.

[0024] The area of ​​the patch body without the adhesive layer is transparent, which facilitates observation of the surface of the vent valve facing the end cap assembly for foreign objects, making it easier to detect vent valve problems in a timely manner. The area of ​​the patch body with the adhesive layer and / or the adhesive layer itself is colored, which facilitates quick identification of whether a protective patch is installed on the end cap assembly, preventing missed patches that would leave the vent membrane unprotected.

[0025] In some embodiments of the end cap assembly, the adhesive layer is located at the edge of the patch body; and / or the adhesive layer avoids the second channel.

[0026] Placing the adhesive layer at the edge of the patch body can reduce the amount of adhesive used without affecting the bonding effect. The adhesive layer avoids the second channel, which helps prevent dust from accumulating in the second channel and thus helps keep the second channel unobstructed.

[0027] In some embodiments of the end cap assembly, the protective patch includes a patch body covering the vent, the patch body being made of polyethylene terephthalate; and / or the thickness of the patch body being 0.1-0.2 mm.

[0028] Using polyethylene terephthalate to make the patch body and / or setting an appropriate thickness for the patch body can effectively block foreign objects such as electrolyte, moisture, and dust.

[0029] In some embodiments of the end cap assembly, the end cap includes a patch mounting slot that protects the patch within the patch mounting slot.

[0030] Installing the protective patch into the patch mounting slot on the end cap 211 facilitates accurate positioning and quick assembly of the protective patch, and also helps prevent the protective patch from falling off.

[0031] A second aspect of this disclosure provides a battery that includes an end cap assembly according to a first aspect of this disclosure. The battery of this disclosure has the advantages of the end cap assembly of this disclosure.

[0032] This disclosure provides a third aspect of an electrical device, wherein the electrical device includes a battery according to the second aspect of this disclosure, the battery being used to provide power to the electrical device. The electrical device of this disclosure has the advantages of the end cap assembly and battery of this disclosure. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of a vehicle as an electrical device according to an embodiment of the present disclosure.

[0035] Figure 2 This is a schematic diagram of the bottom structure of a vehicle serving as an electrical device according to an embodiment of the present disclosure.

[0036] Figure 3 This is a schematic diagram of the structure of a battery according to an embodiment of the present disclosure.

[0037] Figure 4 This is a schematic diagram showing the exploded structure of a single battery cell in a battery according to an embodiment of the present disclosure.

[0038] Figure 5 This is a schematic diagram of the structure of the end cap assembly of a battery cell according to an embodiment of the present disclosure.

[0039] Figure 6 for Figure 5 A schematic diagram of the AA-direction cross-section structure.

[0040] Figure 7 for Figure 6 A magnified structural diagram of part B.

[0041] Figure 8 for Figure 5 A schematic diagram of the end cap structure of the end cap assembly in the illustrated embodiment.

[0042] Figure 9 for Figure 8 Schematic diagram of the CC-direction cross-section structure.

[0043] Figure 10 for Figure 9 A magnified structural diagram of part D.

[0044] Figure 11 for Figure 5 A schematic diagram of the structure of the protective patch for the vent valve in one direction of the end cap assembly.

[0045] Figure 12 for Figure 11 The diagram shows the structure of the protective patch from another direction.

[0046] Figure 13 This is a schematic diagram of the structure of the end cap assembly of a battery cell according to an embodiment of the present disclosure.

[0047] Figure 14 for Figure 13 Schematic diagram of the EE cross-section structure.

[0048] Figure 15 for Figure 14 A magnified structural diagram of part F.

[0049] Figure 16 for Figure 13 A schematic diagram of the end cap structure of the end cap assembly in the illustrated embodiment.

[0050] Figure 17 for Figure 16 Schematic diagram of the GG-direction cross-sectional structure.

[0051] Figure 18 for Figure 17 A magnified structural diagram of the H section.

[0052] Figure 19 This is a schematic diagram of the structure of the end cap assembly of a battery cell according to an embodiment of the present disclosure.

[0053] Figure 20 for Figure 19 Schematic diagram of the II-direction cross-section structure.

[0054] Figure 21 for Figure 19 A schematic diagram of the end cap structure of the end cap assembly in the illustrated embodiment.

[0055] Figure 22 for Figure 21 A schematic diagram of the cross-sectional structure of the JJ.

[0056] Figure 23 for Figure 19 A schematic diagram of the structure of the protective patch for the vent valve in one direction of the end cap assembly.

[0057] Figure 24 for Figure 23 The diagram shows the structure of the protective patch from another direction.

[0058] Figure 25 This is a schematic diagram of the structure of the end cap assembly of a battery cell according to an embodiment of the present disclosure.

[0059] Figure 26 for Figure 25 A schematic diagram of the KK-direction cross-sectional structure.

[0060] Figure 27 for Figure 25 A schematic diagram of the end cap structure of the end cap assembly in the illustrated embodiment.

[0061] Figure 28 for Figure 16 Schematic diagram of the MM-directed cross-sectional structure.

[0062] Figure 29 This is a partial structural diagram of the end cap of the end cap assembly of a battery cell according to an embodiment of the present disclosure.

[0063] The accompanying drawings are not drawn to scale. Detailed Implementation

[0064] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure, that is, this disclosure is not limited to the described embodiments.

[0065] In the description of this disclosure, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable tolerance range. "Parallel" is not parallel in the strict sense, but within the allowable tolerance range.

[0066] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this disclosure. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0067] To address the technical problem that foreign matter such as welding slag and electrolyte spray generated during the welding process in batteries and battery cells contaminates the vent valve and affects its venting performance, this disclosure provides an end cap assembly that effectively protects the vent valve. Furthermore, this disclosure also provides a battery with the end cap assembly and an electrical device incorporating the battery.

[0068] This disclosure provides an electrical device that uses a battery as a power source, the battery being configured to provide electrical energy to the device. The electrical device can be, but is not limited to, mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. 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.

[0069] The battery in this disclosure refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. A battery may include three layers: battery cells, battery modules, and battery packs.

[0070] A battery cell is the smallest unit that makes up a battery module or battery pack. Multiple battery cells can be connected in series and / or parallel via electrode terminals for various applications, such as high-power applications like electric vehicles.

[0071] A battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame to protect them from external impacts, heat, vibration, etc. With the development of technology, this battery module layer can be omitted, that is, the battery pack can be formed directly from the battery cells.

[0072] A battery pack is the final form of a battery system installed in high-power electrical devices such as electric vehicles. A battery pack typically includes a casing for housing one or more individual battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the individual cells. The casing generally consists of a shell and a cover. Most current battery packs are manufactured by assembling a Battery Management System (BMS), thermal management components, and various control and protection systems onto one or more battery modules. This improvement has increased the gravimetric and volumetric energy density of the battery system while significantly reducing the number of components.

[0073] For ease of explanation, the following description uses a vehicle D, an electrical device according to some embodiments of this disclosure, as an example.

[0074] Please refer to Figure 1 and Figure 2 . Figure 1 This is a schematic diagram of the structure of a vehicle D provided in some embodiments of this disclosure. Vehicle D can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery B is installed inside vehicle D, and battery B can be located at the bottom, front, or rear of vehicle D. Battery B can be used to power vehicle D, for example, it can serve as the operating power source for vehicle D.

[0075] Figure 2 It shows Figure 1 The diagram shows the underside structure of the vehicle. Battery B can be mounted on the chassis CH of vehicle D. Vehicle D may also include a controller CON and a motor M. Battery B provides electrical power to the motor M and other components in vehicle D, while controller CON controls the operation of motor M, for example, to meet the power requirements of vehicle D during startup, navigation, and driving.

[0076] In some embodiments of this disclosure, battery B can not only serve as the operating power source for vehicle D, but also as the driving power source for vehicle D, replacing or partially replacing fuel or natural gas to provide driving power for vehicle D.

[0077] Please refer to Figure 3 , Figure 3 An exploded view of battery B provided in some embodiments of this disclosure.

[0078] Battery B includes a housing 1 and battery cells 20 housed within the housing 1. The housing 1 includes a casing 11 and a cover 12 that snaps onto the casing 11. The housing 1 provides space for the battery cells 20. In the above embodiment, the housing 1 is generally rectangular; however, in embodiments not shown, the housing 1 may also be other shapes, such as a cylinder.

[0079] In battery B, there are multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 20 is housed in the casing 1.

[0080] like Figure 3 As shown, battery B can be composed of multiple battery cells 20 connected in series, parallel, or in a mixed configuration to form battery pack 2. Battery pack 2 can be in the form of a battery module. Multiple battery packs 2 can then be connected in series, parallel, or in a mixed configuration to form a whole and housed within housing 1. Battery B may also include other structures; for example, battery B may also include a busbar component for realizing electrical connection between multiple battery cells 20.

[0081] Battery cells can include lithium-ion batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, and can be primary or secondary batteries, etc., which is not limited in this disclosure. Battery cells can be cylindrical, flat, cuboid, or other shapes, which is not limited in this disclosure. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, cuboid / square battery cells, and pouch battery cells, which is not limited in this disclosure.

[0082] A single battery cell mainly consists of an electrode assembly, a housing, and an end cap assembly. The electrode assembly is encapsulated within the housing by the end cap of the end cap assembly. The number of electrode assemblies can be, for example, one, two, or more.

[0083] The electrode assembly is disposed inside the housing. The electrode assembly is the component in the battery cell where the electrochemical reaction takes place. The electrode assembly can be a wound structure or a stacked structure, and the embodiments disclosed herein are not limited to these.

[0084] A housing is a component used to provide a space to house the electrode assembly, electrolyte, and other parts. Housings can come in various shapes and sizes, such as cuboids, cylinders, and hexagonal prisms. Specifically, the shape of the housing is determined based on the specific shape and size of the electrode assembly. The housing can be made of materials such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic.

[0085] An end cap is a component that closes onto the opening of a housing to isolate the internal environment of a battery cell from the external environment. The shape of the end cap can be adapted to the shape of the housing to fit it. Optionally, the end cap can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap is less prone to deformation under pressure and impact, allowing the battery cell to have higher structural strength and improved safety performance. Functional components such as electrode terminals can be provided on the end cap. The electrode terminals can be used for electrical connection with electrode assemblies to output or input electrical energy to the battery cell. In some embodiments, the end cap can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell reaches a threshold. The end cap can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this disclosure does not limit this.

[0086] The housing and end cap can be separate components. The housing has an opening, and the end cap closes the opening to form the internal environment of the battery cell. Alternatively, the end cap and housing can be integrated. Specifically, the end cap and housing can form a common connection surface before other components are installed into the housing. When it is necessary to encapsulate the interior of the housing, the end cap closes the housing, thus encapsulating the housing and end cap as a single unit.

[0087] The end cap assembly may include a pressure relief mechanism. A pressure relief mechanism is a component or part that is actuated to release internal pressure or temperature when the internal pressure or temperature of a battery cell reaches a predetermined threshold. For example, a pressure relief mechanism may be an explosion-proof valve, which is typically located on the end cap of the battery cell. The explosion-proof valve may be part of the flat surface of the end cap, or it may be welded to the flat surface of the end cap.

[0088] The end cap assembly may also include a vent valve, which is waterproof, breathable, oil-proof, and dust-proof. While providing protection, it balances the internal and external pressures of the battery box, protecting internal components. The vent valve is an assemblable and detachable protective component formed by combining the vent membrane with the valve body through processes such as injection molding, welding, bonding, and hot-melt. Under the influence of pressure difference, the gas inside and outside the battery cell's casing passes through the gas channel of the vent valve and through the vent membrane, achieving gas compensation and maintaining the pressure balance of the gas inside and outside the battery box. The vent membrane is the core component of the vent valve; for example, expanded polytetrafluoroethylene (E-PTFE) can be used. Vent valves can be classified according to the connection method between the vent membrane and the valve body as injection molding type, welding type, interference fit type, and bonding type; according to the gas flow direction as unidirectional and bidirectional types; and according to different installation connection methods as threaded type, press-fit type, snap-fit ​​type, and button type, etc. This disclosure does not limit these categories.

[0089] In some embodiments of the battery cell, an insulating element may be provided inside the end cap. The insulating element can be used to isolate the electrical connection components inside the housing from the end cap to reduce the risk of short circuits. For example, the insulating element may be an insulating board, which may be made of materials such as plastic or rubber.

[0090] like Figure 4 As shown in some embodiments of this disclosure, the battery cell 20 includes an end cap assembly 21, a housing 25, a first electrode assembly 241, a second electrode assembly 242, a first connecting piece 22, and a first connecting piece 23. The first connecting piece 22 connects the positive electrode tabs of the first electrode assembly 241 and the second electrode assembly 242 to the first electrode terminal 212 on the end cap 211 of the end cap assembly 21, and the first connecting piece 23 connects the negative electrode tabs of the first electrode assembly 241 and the second electrode assembly 242 to the second electrode terminal 213 on the end cap 211 of the end cap assembly 21.

[0091] like Figure 4As shown, the end cap assembly 21 includes an end cap 211, a first electrode terminal 212, a second electrode terminal 213, an explosion-proof valve 214, a vent valve 215, and an insulating plate 216. The end cap 211 cooperates with the housing 25 to encapsulate the first electrode assembly 241 and the second electrode assembly 242 within the sealed space formed by the end cap 211 and the housing 25. The first electrode terminal 212 is the positive terminal, electrically connected to the positive tabs of the first electrode assembly 241 and the second electrode assembly 242 via a first connecting piece 22; the second electrode terminal 213 is the negative terminal, electrically connected to the negative tabs of the first electrode assembly 241 and the second electrode assembly 242 via a first connecting piece 23. The insulating plate 216 is disposed between the end cap 211 and the first connecting pieces 22 and 23, and to provide insulation between the end cap 211 and the first connecting pieces 22 and 23, as well as between the first electrode assembly 241 and the second electrode assembly 242.

[0092] like Figures 5 to 29 As shown, the end cap assembly 21 provided in this embodiment of the present disclosure is used for a battery, including an end cap 211 and a vent valve 215 mounted on the end cap 211. The end cap 211 has a first side facing the interior of the battery and a second side opposite to the first side, and includes a first channel 2113 communicating the first side and the second side. The vent valve 215 includes a vent membrane 2152 including gas communication with the first channel 2113. The vent membrane 2152 includes a vent portion 2152A that opens toward the second side of the end cap 211. The vent valve 215 also includes a protective patch 217, which is disposed on the second side of the end cap 211 and covers the vent portion 2152A.

[0093] According to the end cap assembly 21 of the present disclosure, since a protective patch 217 is provided, the protective patch 217 covers the vent portion 2152A of the vent membrane 2152 that is open towards the second side of the end cap 211, which is beneficial to prevent welding slag or electrolyte from contaminating the vent membrane 2152. Therefore, the vent membrane 2152 of the vent valve 215 in the end cap assembly 21 can be protected by the protective patch 217, which improves the venting effect of the vent valve 215, and enables the vent valve to better realize its function of balancing the internal and external pressure of the battery cell and protecting the internal components.

[0094] like Figures 5 to 10 , Figures 13 to 22 , Figures 25 to 29 As shown, in some embodiments of the end cap assembly, the protective patch 217 and the end cap 211 have a second channel in gas communication with the breathable membrane 2152.

[0095] Because the protective patch 217 and the end cap 211 have a second channel that communicates with the gas through the venting membrane 2152, the second channel allows the airflow through the venting membrane 217 via the venting valve 215 to smoothly enter and exit the battery cell 20.

[0096] like Figures 6 to 10 , Figures 14 to 18 , Figure 20 and Figure 22 , Figure 26 and Figure 28 As shown, in some embodiments of the end cap assembly 21, the end cap 211 includes a vent valve mounting groove 2112, the vent valve is located in the vent valve mounting groove 2112, a first channel 2113 is disposed on the bottom wall of the vent valve mounting groove 2112, and a second channel communicates with the vent valve mounting groove 2112. The opening of the vent valve mounting groove 2112 is disposed on the first side of the end cap 211, or the opening of the vent valve mounting groove 2112 is disposed on the second side of the end cap 211.

[0097] Installing the vent membrane 2152 via the valve plate 2151 provides protection and support for the vent membrane 2152, reducing the adverse effects caused by the first channel 2113 on the end cap 211. Positioning the valve plate 2151 and the vent membrane 2152 within the vent valve mounting groove 2112 ensures that the vent valve's installation minimizes its impact on the thickness of the end cap 211 without affecting its ventilation, thus reducing the overall height of the end cap assembly 21 and the battery.

[0098] Valve plate 2151 may be made of aluminum plate, for example. Vent membrane 2152 may be fixed to valve plate 2151 by various methods, such as chemical bonding. Valve plate 2151 may be mounted on end cap 211 by various methods, such as laser welding.

[0099] like Figure 6 , Figure 7 , Figure 14 , Figure 15 , Figure 20 , Figure 26 As shown, in some embodiments of the end cap assembly 21, the vent valve further includes a valve plate 2151, which is mounted on the end cap 211 and has a third channel 2151A penetrating both sides of the valve plate 2151. A vent membrane 2152 is fixed to the valve plate 2151 and covers the third channel 2151A. Figures 6 to 10 , Figures 14 to 18 , Figure 20 and Figure 22 , Figure 26 and Figure 28As shown, the vent valve mounting groove 2112 is a stepped groove, comprising a first groove segment 2112A and a second groove segment 2112B. The first groove segment 2112A is close to the bottom wall of the vent valve mounting groove 2112, and the vent membrane 2152 is located within the first groove segment 2112A and has a gap with the bottom wall. The second groove segment 2112B is connected to the first groove segment 2112A and forms a stepped surface 2112C at the connection. The valve plate 2151 is located within the second groove segment 2112B and abuts against the stepped surface 2112C.

[0100] The above configuration facilitates fluid communication between the breathable membrane 2152 and the first channel 2113 and the third channel 2151A, and helps the breathable membrane 2152 stably achieve its function of balancing the internal and external pressure of the battery cell.

[0101] In some embodiments of the end cap assembly 21, the height H1 of the first groove segment 2112A is 0.1-0.5 mm greater than the thickness of the breathable membrane 2152; and / or the height H2 of the second groove segment 2112B is equal to or within 0.5 mm greater than the thickness of the valve plate 2151.

[0102] By appropriately setting the relationship between the height H1 of the first groove section 2112A and the thickness of the breathable membrane 2152, it is beneficial to maintain unobstructed flow between the breathable membrane 2152 and the first channel 2113. By appropriately setting the relationship between the height H2 of the second groove section 2112B and the thickness of the valve plate 2151, it is beneficial to reduce the extra space occupied by the breathable valve 215 beyond the thickness of the end plate 211, and at the same time, it is beneficial to reduce the adverse effects on the end plate 211 caused by processing the breathable valve mounting groove 2112.

[0103] like Figures 6 to 10 , Figures 14 to 18 , Figure 20 and Figure 22 , Figure 26 and Figure 28 As shown, in some embodiments of the end cap assembly 21, the end cap 211 includes an end cap body 2111, and a vent valve mounting groove 2112 is disposed on the end cap body 2111. The end cap 211 further includes: a boss 2114 disposed on the end cap body 2111 and protruding toward the second side of the end cap 211, the second channel including a connecting groove 2115 or a connecting hole disposed on the boss 2114; and / or a vent groove 2116 disposed on the end cap body 2111, located on the second side of the end cap 211 and communicating with the vent valve mounting groove 2112, the second channel including the vent groove 2116.

[0104] A boss 2114 is provided, and a connecting groove 2115 or a connecting hole is provided on the boss 2114 as at least part of the second channel, or a ventilation groove 2116 is provided as at least part of the second channel, which facilitates the realization of the second channel through a simple structure and processing method, and maintains the ventilation function of the breathable membrane 2152 from the influence of the protective patch 217.

[0105] One or more connecting slots can be formed on the boss 2114. The extension direction and cross-sectional shape of the connecting slots are not limited; for example, the cross-sectional shape can be circular, square, triangular, polygonal, etc. One or more connecting holes can also be formed on the boss 2114. The extension direction and cross-sectional shape of the connecting holes are not limited; for example, the cross-sectional shape can be circular, square, triangular, polygonal, etc. Connecting slots and connecting holes can also be provided simultaneously on the boss 2114. The position of the connecting slots or connecting holes can be reasonably set according to the environment surrounding the protective patch 217, and the number and size of the connecting slots or connecting holes can be reasonably set according to the required flow area of ​​the second channel.

[0106] In some embodiments of the end cap assembly 21, the height H3 of the boss 2114 is 0.1-0.5 mm; and / or the boss 2114 is located outside the vent valve mounting groove 2112 and the distance L1 between the edge of the boss 2114 near the vent valve mounting groove 2112 and the edge of the vent valve mounting groove 2112 is 0.5-3 mm.

[0107] Setting the height H3 of the boss 2114 appropriately helps to minimize the height occupied by the vent valve 215 while ensuring smooth airflow through the vent valve 215 between the inside and outside of the battery cell. Setting the relative position of the boss 2114 and the vent valve mounting groove 2112 appropriately facilitates the assembly and maintenance of the vent valve, for example, by providing operating space for laser welding when installing the valve plate.

[0108] In some embodiments of the end cap assembly 21, the depth H4 of the vent groove 2116 is 0.05-0.3 mm; and / or the distance L2 between the outer edge of the vent groove 2116 and the edge of the protective patch 217 is 0.1-0.5 mm.

[0109] The depth of the venting groove 2116 and its distance from the protective patch 217 are set in a reasonable manner to ensure that the airflow inside and outside the battery cell flows smoothly through the venting valve 215.

[0110] like Figure 11 and Figure 12 , Figure 23 and Figure 24As shown, in some embodiments of the end cap assembly 21, the protective patch 217 includes a patch body 2171 covering the vent 2152A and a fixing adhesive layer 2172. The fixing adhesive layer 2172 is disposed on the side of the patch body 2171 facing the end cap 211, and the patch body 2171 is attached to the second side of the end cap 211 by the fixing adhesive layer 2172.

[0111] The protective patch 217 is provided with a patch body 2171 and a fixing adhesive layer 2172. The patch body 2171 is fixedly connected by the fixing adhesive layer 2172, which facilitates the quick and secure installation of the protective patch 217.

[0112] In some embodiments of the end cap assembly 21, a fixing adhesive layer 2172 is attached to a portion of the patch body 2171, wherein the portion of the patch body 2171 without the fixing adhesive layer 2172 is transparent; and / or the portion of the patch body 2171 with the fixing adhesive layer 2172 and / or the fixing adhesive layer 2172 is colored.

[0113] The area of ​​the patch body 2171 without the adhesive layer 2172 is transparent, which facilitates observation of whether there are foreign objects on the surface of the vent valve 215 facing the end cap assembly 21, and makes it easier to detect problems with the vent valve 215 in a timely manner. The area of ​​the patch body 2171 with the adhesive layer 2172 and / or the adhesive layer 2172 is colored, such as red, green, blue, yellow, etc., which facilitates quick identification of whether a protective patch 217 is provided on the end cap assembly 21, and prevents the vent membrane 217 from being unprotected due to missed application.

[0114] like Figure 11 and Figure 12 , Figure 23 and Figure 24 As shown, in some embodiments of the end cap assembly 21, the fixing adhesive layer 2172 is located at the edge of the patch body 2171; and / or the fixing adhesive layer 2172 avoids the second channel.

[0115] Placing the adhesive layer 2172 at the edge of the patch body 2171 can reduce the amount of adhesive used without affecting the bonding effect. The adhesive layer 2172 avoids the second channel, which helps to prevent dust from accumulating in the second channel and thus helps to keep the second channel unobstructed.

[0116] In some embodiments of the end cap assembly 21, the protective patch 217 includes a patch body 2171 covering the vent 2152A, the patch body 2171 being made of polyethylene glycol terephthalate (PET); and / or, the thickness of the patch body 2171 is 0.1-0.2 mm.

[0117] Using polyethylene terephthalate to make the patch body 2171 and / or setting an appropriate thickness for the patch body 2171 can effectively block foreign objects such as electrolyte, moisture, and dust.

[0118] like Figure 29 As shown, in some embodiments of the end cap assembly 21, the end cap 211 includes a patch mounting groove 2117, and the protective patch 217 is located within the patch mounting groove 2117.

[0119] Installing the protective patch 217 into the patch mounting slot 2117 on the end cover 211 facilitates accurate positioning and quick assembly of the protective patch 217, and also helps prevent the protective patch 217 from falling off.

[0120] The battery of this disclosure includes an end cap assembly 21 of this disclosure. The battery of this disclosure has the advantages of the end cap assembly 21 of this disclosure.

[0121] The electrical device of this disclosure includes a battery of this disclosure, which provides power to the electrical device. The electrical device of this disclosure has the advantages of the end cap assembly 21 and the battery of this disclosure.

[0122] The following combination Figures 5 to 29 The end cap assembly of some embodiments of this disclosure will be described in more detail below. The battery of the embodiments of this disclosure includes the end cap assembly of the embodiments of this disclosure, and the electrical device of the embodiments of this disclosure includes the battery of the embodiments of this disclosure. The battery and the electrical device will not be described in detail below.

[0123] like Figures 5 to 12 In the embodiment shown, the end cap assembly 21 includes an end cap 211, a first electrode terminal 212, a second electrode terminal 213, an explosion-proof valve 214, a vent valve 215, and an insulating plate 216. The first electrode terminal 212, the second electrode terminal 213, the explosion-proof valve 214, the vent valve 215, and the insulating plate 216 are all mounted on the end cap 211.

[0124] End cap 211 has a first side facing the interior of the battery (corresponding to) Figure 6 (the lower side) and the second side opposite to the first side (corresponding to) Figure 6 The upper side of the end cap 211 includes a first channel 2113 connecting the first side and the second side. The first channel 2113 is a through hole formed on the end cap body 2111 of the end cap 211.

[0125] The vent valve 215 includes a vent valve, which includes a valve plate 2151 mounted on the end cap body 2111 and a vent membrane 2152 mounted on the valve plate 2151 that communicates with the gas in the first channel 2113.

[0126] The valve plate 2151 is made of aluminum plate and has a third channel 2151A. The third channel 2151A is a through hole connecting both sides of the valve plate 2151. The shape, number and size of the through holes can be set according to the ventilation requirements. The valve plate 2151 is fixed to the end cap body 2111 by laser welding.

[0127] The breathable membrane is chemically bonded to one side of the valve plate 2151, and the breathable membrane 2152 covers the third channel 2151A of the valve plate 2151 to ensure that the airflow flowing through the third channel 2151A passes through the breathable membrane 2152.

[0128] like Figure 7 As shown, in this embodiment, the breathable membrane 2152 is located on the first side of the valve plate 2151 (corresponding to...). Figure 7 The area of ​​the breathable membrane 2152 covering the third channel 2151A faces the second side of the end cap 211 (corresponding to the lower side), but the area of ​​the breathable membrane 2152 covering the third channel 2151A faces the second side of the end cap 211 (corresponding to the lower side). Figure 7 The upper side is open, forming a breathable section 2152A.

[0129] like Figures 5 to 7 As shown, the protective patch 217 is fixed to the second side of the end cap 211. The protective patch 217 includes a patch body 2171, which covers the venting portion 2152A of the breathable membrane 2152 that is open towards the second side of the end cap 211. The patch body 2171 is made of PET and has a thickness of 0.2 mm.

[0130] To prevent the protective patch 217 from affecting the normal operation of the vent valve 215, a second channel communicating with the gas of the vent membrane 2152 is provided between the patch body 2171 and the end cap 211.

[0131] like Figures 6 to 10 As shown, the end cap 211 includes an end cap body 2111 and a boss 2114 disposed on the end cap body 2111 and protruding towards the second side of the end cap 211. A vent valve mounting groove 2112 is provided on the end cap body 2111. The vent valve 215 is installed in the vent valve mounting groove 2112. A first channel 2113 is disposed on the bottom wall of the vent valve mounting groove 2112, and a second channel disposed between the protective patch 217 and the end cap 211 communicates with the vent valve mounting groove 2112 to ensure that the vent valve 215 balances the internal and external air pressure of the battery cell 20. The opening of the vent valve mounting groove 2112 is disposed on the first side of the end cap 211.

[0132] like Figures 6 to 10As shown, the vent valve mounting groove 2112 is a stepped groove, comprising a first groove segment 2112A and a second groove segment 2112B. The first groove segment 2112A is close to the bottom wall of the vent valve mounting groove 2112. The vent membrane 2152 is located within the first groove segment 2112A and has a gap with the bottom wall to ensure that the airflow entering and exiting the battery cell 20 from the first channel 2113 passes smoothly through the vent membrane 2152. The second groove segment 2112B is connected to the first groove segment 2112A and forms a stepped surface 2112C at the connection. The valve plate 2151 is located within the second groove segment 2112B and abuts against the stepped surface 2112C. The valve plate 2151 and the stepped surface 2112C are fixedly connected by laser welding.

[0133] To ensure unobstructed gas flow between the breathable membrane 2152 and the first channel 2113, the height H1 of the first groove section 2112A is 0.3 mm greater than the thickness of the breathable membrane 2152; to ensure unobstructed airflow between the breathable membrane 2152 and the second channel, the height H2 of the second groove section 2112B is 0.1 mm greater than the thickness of the valve plate 2151.

[0134] The boss 2114 is located outside the vent valve mounting groove 2112. The boss 2114 extends along the length of the end cap 211 (corresponding to...). Figures 5 to 10 A rectangular cross-section connecting groove 2115 is provided on each of the two opposite sides (left and right directions). The height of each connecting groove 2115 is the same as the height of the boss 2114. The two connecting grooves 2115 serve as a second channel to ensure smooth airflow in and out of the vent valve 215. The height H3 of the boss 2114 is 0.3mm. The distance L1 between the edge of the boss 2114 near the vent valve mounting groove 2112 and the edge of the vent valve mounting groove 2112 is 2mm.

[0135] like Figure 11 and Figure 12 As shown, the protective patch 217 also includes a fixing adhesive layer 2172, which is disposed on the side of the patch body 2171 facing the end cap 211. The patch body 2171 is adhered to the second side of the end cap 211 by the fixing adhesive layer 2172. The fixing adhesive layer 2172 is attached to a portion of the patch body 2171. The areas of the patch body 2171 without the fixing adhesive layer 2172 are transparent. The fixing adhesive layer 2172 is green.

[0136] like Figure 11 and Figure 12 As shown, in this embodiment, the fixing adhesive layer 2172 is located at the edge of the patch body 2171 and corresponds to the position on the boss 2114 where the connecting groove 2115 is not formed, thereby achieving the fixing adhesive layer 2172 avoiding the second channel. The valve plate 2151, the breathable membrane 2152, and the protective patch 217 of the vent valve 215 are all along the width direction of the end cap 211 (corresponding to...). Figure 5An elongated oval extending in the vertical direction. For example... Figure 8 As shown, the portion of the boss 2114 without the connecting groove 2115 forms a pair of U-shaped openings that are opposite to each other and spaced apart on the end cap. Correspondingly, the fixing adhesive layer 2172 also forms a pair of U-shaped openings that are opposite to each other and spaced apart on the edge of the patch body 2171. The protective patch 217 is placed over the boss 2114, and the fixing adhesive layer 2172 is positioned opposite to and adhered to the boss 2114, thereby fixing the protective patch 217 to the second side of the end cap 211.

[0137] like Figures 13 to 18 In the illustrated embodiment, with Figures 5 to 12 The difference between the embodiments shown is that the installation method of the protective patch 217 and the setting method of the second channel are different.

[0138] like Figures 13 to 18 As shown, the protective patch 217 is not provided with a boss on the second side of the end cap body 2111 of the end cap 211, and the protective patch 217 is directly attached to the surface of the second side of the end cap body 2111. The second channel includes a venting groove 2116 provided on the second side of the end cap body 2111 and communicating with the vent valve mounting groove 2112. To maintain unobstructed airflow to the vent valve 215, the depth H4 of the venting groove 2116 is 0.2 mm; the distance L2 between the outer edge of the venting groove 2116 and the edge of the protective patch 217 is 0.4 mm; the height H2 of the second groove segment 2112B is 0.3 mm greater than the thickness of the valve plate 2151.

[0139] Ventilation slots 2116 are two rectangular slots arranged opposite each other. In embodiments not shown, the ventilation slots can be other shapes, such as having an arc-shaped cross-section, a trapezoidal cross-section, a triangular cross-section, etc., and can also be of other quantities, such as one, three, or four or more. The size, shape, and number of ventilation slots can be reasonably set according to the flow area of ​​the second channel. The placement of the ventilation slots can be reasonably set according to the environment around the protective patch.

[0140] The above is only for Figures 13 to 18 The illustrated embodiments and Figures 5 to 12 The differences between the illustrated embodiments have been explained. Any parts not described in this embodiment can be found by referring to [the relevant documentation]. Figures 5 to 12 The relevant content of the illustrated embodiment will not be described again here.

[0141] like Figures 19 to 24 As shown, with Figures 5 to 12 The difference between the embodiments shown is that the location of the vent valve mounting groove 2112 is different.

[0142] like Figures 19 to 22As shown, in this embodiment, the opening of the vent valve mounting groove 2112 faces the first side of the end cap 211. The vent portion 2152A of the vent membrane 2152, which opens towards the second side of the end cap 211, is located within the opening area of ​​the third channel 2113. A boss 2114 is provided on the second side of the end cap 211, surrounding the port of the third channel 2113 on the second side of the end cap 211, and two connecting grooves 2116 are provided on the boss 2114 as a second channel.

[0143] like Figure 23 and Figure 24 As shown, the fixing adhesive layer 2172 is located at the edge of the patch body 2171 and corresponds to the position on the boss 2114 where the connecting groove 2115 is not formed, thereby allowing the fixing adhesive layer 2172 to avoid the second channel. The valve plate 2151 and the vent membrane 2152 of the vent valve 215 are both along the width direction of the end cap 211 (corresponding to...). Figure 5 The end cap body 2111 is an elongated oval extending vertically. The third channel 2113 is a circular hole on the end cap body 2111. The boss 2114 surrounds the port of the third channel 2113, and the part without the connecting groove 2115 is two spaced, opposing arc-shaped sections. The protective patch 217 is circular. Corresponding to the boss 2114, the fixing adhesive layer 2172 on the edge of the patch body 2171 also forms a pair of spaced, opposing arc-shaped sections. The protective patch 217 is placed over the boss 2114, and the fixing adhesive layer 2172 is positioned opposite to and adheres to the boss 2114, thereby fixing the protective patch 217 to the second side of the end cap 211.

[0144] The above is only for Figures 19 to 24 The illustrated embodiments and Figures 5 to 12 The differences between the illustrated embodiments have been explained. Any parts not described in this embodiment can be found by referring to [the relevant documentation]. Figures 5 to 12 The relevant content of the illustrated embodiment will not be described again here.

[0145] like Figures 25 to 28 As shown, with Figures 19 to 24 The embodiment shown differs in that the protective patch 217 on the second side of the end cap body 2111 of the end cap 211 does not have a boss; the protective patch 217 is directly attached to the second side surface of the end cap body 2111. The second channel includes a venting groove 2116 located on the second side of the end cap body 2111 and communicating with the vent valve mounting groove 2112. To ensure unobstructed airflow to the vent valve 215, the depth H4 of the venting groove 2116 is 0.3 mm; the distance L2 between the outer edge of the venting groove 2116 and the edge of the protective patch 217 is 0.5 mm. The height H2 of the second groove segment 2112B is 0.1 mm greater than the thickness of the valve plate 2151.

[0146] In this embodiment, the venting slots 2116 are two rectangular slots arranged opposite each other. In embodiments not shown, the venting slots can be other shapes, such as having an arc-shaped cross-section, a trapezoidal cross-section, a triangular cross-section, etc., and can also be of other quantities, such as one, three, or four or more. The size, shape, and number of venting slots can be reasonably set according to the flow area of ​​the second channel. The placement of the venting slots can be reasonably set according to the environment around the protective patch.

[0147] The above is only for Figures 25 to 28 The illustrated embodiments and Figures 19 to 24 The differences between the illustrated embodiments have been explained. Any parts not described in this embodiment can be found by referring to [the relevant documentation]. Figures 5 to 12 and Figures 19 to 24 The relevant content of the illustrated embodiment will not be described again here.

[0148] like Figure 29 As shown, with Figures 13 to 18 The difference in the illustrated embodiment is that the end cap body 2111 is also provided with a patch mounting groove 2117, and the protective patch 217 is located in the patch mounting groove 2117. Installing the protective patch 217 in the patch mounting groove 2117 on the end cap 211 facilitates accurate positioning of the protective patch 217, rapid assembly, and also helps prevent the protective patch 217 from falling off.

[0149] The above is only for Figure 29 The illustrated embodiments and Figures 13 to 18 The differences between the illustrated embodiments have been explained. Any parts not described in this embodiment can be found by referring to [the relevant documentation]. Figures 5 to 12 and Figures 13 to 18 The relevant content of the illustrated embodiment will not be described again here.

[0150] While this disclosure has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this disclosure. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This disclosure 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 (21) for a battery, comprising: The end cap (211) has a first side facing the interior of the battery and a second side opposite to the first side, and includes a first channel (2113) connecting the first side and the second side; A vent valve (215) includes a vent membrane (2152) in gas communication with the first channel (2113), the vent membrane (2152) including a vent portion (2152A) open toward the second side of the end cap (211); and A protective patch (217) is disposed on the second side of the end cap (211) and covers the ventilated portion (2152A). The protective patch (217) and the end cap (211) have a second channel communicating with the gas of the ventilated membrane (2152). The end cap (211) includes a vent valve mounting groove (2112), the vent valve (215) is located in the vent valve mounting groove (2112), the first channel (2113) is disposed on the bottom wall of the vent valve mounting groove (2112), and the second channel is connected to the vent valve mounting groove (2112). The opening of the vent valve mounting groove (2112) is disposed on the first side of the end cap (211), or the opening of the vent valve mounting groove (2112) is disposed on the second side of the end cap (211).

2. The end cap assembly (21) according to claim 1, wherein, The vent valve (215) further includes a valve plate (2151), which is mounted on the end cap (211) and has a third channel (2151A) penetrating both sides of the valve plate (2151). The vent membrane (2152) is fixed to the valve plate (2151) and covers the third channel (2151A). The vent valve mounting groove (2112) is a stepped groove, which includes: The first groove segment (2112A) is located near the bottom wall of the vent valve mounting groove (2112), and the vent membrane (2152) is located within the first groove segment (2112A) and has a gap with the bottom wall; and The second groove segment (2112B) is connected to the first groove segment (2112A) and forms a stepped surface (2112C) at the connection. The valve plate (2151) is located in the second groove segment (2112B) and abuts against the stepped surface (2112C).

3. The end cap assembly (21) according to claim 2, wherein, The height (H1) of the first groove segment (2112A) is 0.1-0.5 mm greater than the thickness of the breathable membrane (2152); and / or The height (H2) of the second groove segment (2112B) is equal to or within 0.5 mm greater than the thickness of the valve plate (2151).

4. The end cap assembly (21) according to claim 1, wherein, The end cap (211) includes an end cap body (2111), and the vent valve mounting groove (2112) is disposed on the end cap body (2111). The end cap (211) further includes: A boss (2114) is disposed on the end cap body (2111) and protrudes toward the second side of the end cap (2111), the second channel including a communicating groove (2115) or communicating hole disposed on the boss (2114); and / or Ventilation groove (2116) is disposed on the end cap body (2111), located on the second side of the end cap (211) and communicating with the vent valve mounting groove (2112), the second channel including the ventilation groove (2116).

5. The end cap assembly (21) according to claim 4, wherein, The height (H3) of the boss (2114) is 0.1-0.5 mm; and / or The boss (2114) is located outside the vent valve mounting groove (2112), and the distance (L1) between the edge of the boss (2114) near the vent valve mounting groove (2112) and the edge of the vent valve mounting groove (2112) is 0.5-3mm.

6. The end cap assembly (21) according to claim 4, wherein, The depth (H4) of the ventilation groove (2116) is 0.05-0.3 mm; and / or The distance (L2) between the outer edge of the ventilation groove (2116) and the edge of the protective patch (217) is 0.1-0.5 mm.

7. The end cap assembly (21) according to any one of claims 1 to 6, wherein, The protective patch (217) includes a patch body (2171) covering the breathable portion (2152A) and a fixing adhesive layer (2172). The fixing adhesive layer (2172) is disposed on the side of the patch body (2171) facing the end cap (211). The patch body (2171) is attached to the second side of the end cap (211) by the fixing adhesive layer (2172).

8. The end cap assembly (21) according to claim 7, wherein the fixing adhesive layer (2172) is attached to a portion of the patch body (2171), wherein, The area of ​​the patch body (2171) where the fixing adhesive layer (2172) is not attached is transparent; and / or The area of ​​the patch body (2171) where the fixing adhesive layer (2172) is attached and / or the fixing adhesive layer (2172) is colored.

9. The end cap assembly (21) according to claim 7, wherein, The fixing adhesive layer (2172) is located at the edge of the patch body (2171); and / or The fixing adhesive layer (2172) avoids the second channel.

10. The end cap assembly (21) according to any one of claims 1 to 6, wherein the protective patch (217) comprises a patch body (2171) covering the vent (2152A), wherein, The patch body (2171) is made of polyethylene terephthalate; and / or The thickness of the patch body (2171) is 0.1-0.2 mm.

11. The end cap assembly (21) according to any one of claims 1 to 6, wherein, The end cap (211) includes a patch mounting groove (2117), and the protective patch (217) is located in the patch mounting groove (2117).

12. A battery, wherein, The battery includes an end cap assembly (21) according to any one of claims 1 to 11.

13. An electrical appliance, wherein, The electrical device includes the battery according to claim 12, the battery being used to provide power to the electrical device.

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