Battery cell, battery and electric device

Abstract

The utility model relates to a battery monomer, a battery and a power utilization device. The battery cell includes: a case having an opening; the electrode assembly is arranged in the shell; the end cover assembly covers the opening; wherein the end cover assembly comprises an end cover, the end cover is provided with a connecting piece, a through hole used for exhausting is formed in the connecting piece, and the through hole is communicated with the interior of the shell; and the sealing assembly comprises a fastening piece and a sealing piece connected to the fastening piece, and the fastening piece is detachably connected with the connecting piece so that the sealing piece can seal the through hole. According to the battery monomer, the end cover and the sealing assembly are arranged in a matched manner, so that the influence of gas expansion on the use performance of the battery monomer and the battery formed by the battery monomer can be reduced. And moreover, electrolyte can be injected into the shell through the through holes, so that the service lives of the battery monomers and the battery consisting of the battery monomers are prolonged.

Description

Technical Field

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

[0002] In the related art, when a battery cell is in use, gas generated by chemical reactions in the battery cell will remain inside the shell. The gas inside the shell will cause the shell size to expand, affecting the pressure and size of the battery composed of multiple battery cells, and having a negative impact on the performance of the battery cell and the battery composed of the battery cell. In addition, the battery cell in the assembled state cannot be filled with electrolyte from the outside, which affects the service life of the battery cell. Utility Model Content

[0003] The present application aims to solve the problem that the gas generated in the shell of the current battery cell causes the shell size to expand and thus reduces the performance of the battery cell and the battery. To this end, the present application provides a battery cell, a battery and an electrical device.

[0004] In a first aspect, the present application provides a battery cell, comprising:

[0005] a housing having an opening;

[0006] An electrode assembly is disposed in the housing;

[0007] An end cover assembly, covering the opening;

[0008] Wherein, the end cover assembly comprises:

[0009] The end cover has a connecting piece, the connecting piece is provided with a through hole for exhaust, and the through hole is connected to the interior of the shell;

[0010] The sealing assembly comprises a fastener and a sealing member connected to the fastener, wherein the fastener and the connecting member are detachably connected so that the sealing member seals the through hole.

[0011] The battery cell according to the first aspect of the present application has at least the following beneficial effects:

[0012] The battery cell of the present application is arranged in cooperation with the end cover and the sealing assembly. During the normal use of the battery cell, the fastener forms a stable detachable connection with the connector, so that the fastener is detachably connected to the connector, and the shell is in a stable sealed state. When the battery cell needs to be vented or injected, the fastener can be removed and separated from the connector, so that the fastener drives the seal thereon to detach from the through hole, so that the gas in the shell can be discharged outward through the through hole, reducing the effect of gas expansion on the performance of the battery cell and the battery composed of the battery cell. Moreover, the gas in the shell will not contact the fastener and the seal thereon when it is discharged, which can reduce the impact of air pressure on the fastener and the seal thereon, and increase the service life of the fastener and the seal thereon. In addition, it is also possible to inject electrolyte into the shell through the through hole to extend the service life of the battery cell and the battery composed of the battery cell.

[0013] In some embodiments, the sealing member is constructed as an elastic structure, and the fastener is configured to provide a pressing force to the sealing member toward the connecting member when connected with the connecting member.

[0014] Such arrangement causes the seal to produce elastic deformation to press the seal against the end face of the through hole, so that the seal seals the through hole with interference, and keeps the seal in a fixed state of sealing the through hole, so that the shell as a whole is in a sealed state, thereby improving the sealing effect of the through hole.

[0015] In some embodiments, a covering cavity is formed on the fastener, the sealing member is accommodated in the covering cavity, the fastener is sleeved on the connecting member and presses the sealing member against the connecting member to seal the through hole.

[0016] Such an arrangement allows the fastener and the connector to form a tight fit while accommodating the seal in the covering cavity, so that the fastener forms a covering protection for the seal, reducing the probability of external water vapor entering the fastener and directly contacting the seal to cause oxidation corrosion to the seal, improving the structural stability of the seal, and correspondingly improving the sealing effect of the seal on the through hole.

[0017] In some embodiments, a convex portion is formed on the connector, protruding from the end cover away from the shell side, the through hole passes through the convex portion axially, and the cover cavity is threadedly connected to the convex portion so that the seal has an interference fit with the top surface of the convex portion.

[0018] Such an arrangement enables the seal to be kept in a compressed state when the fastener and the connector are in a stable connection, thereby maintaining a stable seal on the through hole. At the same time, the through hole can be opened by directly unscrewing the fastener from the connector, so that the gas in the shell can be discharged and the electrolyte can be added to the shell, simplifying the exhaust process and the liquid injection process.

[0019] In some embodiments, the bottom end of the fastener is provided with a flange portion along the circumferential direction that is snap-fitted to a side of the end cover facing away from the shell.

[0020] With such arrangement, when the fastener is sleeved on the convex portion on the connecting piece and forms a stable threaded connection with the convex portion, the flange portion at the bottom of the fastener is buckled on the end cover so that the flange portion fits tightly against the surface of the end cover, so that the fastener forms a tight covering for the convex portion on the connecting piece, thereby reducing the gap between the fastener and the connecting piece and between the fastener and the end cover, reducing the probability of external water vapor entering the connecting piece and the interior of the fastener, and improving the sealing effect.

[0021] In some embodiments, the end cover assembly further includes a dustproof member, which is limitedly disposed through the through hole and forms an exhaust gap between the through hole and the dustproof member.

[0022] With such arrangement, when the fastener drives the seal thereon to be disassembled and separated from the connecting piece, the dustproof piece can be used to stop external dust particles, thereby reducing the probability of external dust entering the through hole during the disassembly and separation of the fastener and the connecting piece.

[0023] In some embodiments, the dustproof part includes a rod portion and a head integrally connected to the rod portion, the rod portion is inserted into the through hole, the head portion is flush with the end surface of the through hole, and the head portion is constructed as an arc-shaped structure protruding toward the shell to form the exhaust gap with the through hole.

[0024] Such a setting reduces the size of the exhaust gap and improves the dustproof part's blocking and protective effect on external dust. At the same time, it prevents the dustproof part from forming structural interference with the sealing part and makes it easier for the head of the dustproof part to form negative pressure when it is pulled out, which is beneficial for the negative pressure device to pull the dustproof part out of the through hole and improve the exhaust efficiency.

[0025] In some embodiments, a limiting portion is provided on the connecting member, the limiting portion is located in the through hole and is configured to allow the airflow in the through hole to pass through, and the dustproof member abuts against the limiting portion.

[0026] Such arrangement, on the one hand, enables the dustproof part to be limitedly penetrated inside the through hole and to be pulled out by external force, and on the other hand, enables the gas in the shell to be discharged outward through the exhaust gap synchronously during the process of disassembly and separation of the fastener and the seal thereon from the connecting part, thereby improving the exhaust efficiency.

[0027] In some embodiments, the limiting portion includes a plurality of stop bars, all of which are connected to the inner wall of the through hole and are radially distributed, and a vent for air flow to pass through is formed between two adjacent stop bars.

[0028] Such arrangement allows the dustproof part to be stopped by the limiting part, while the limiting part only occupies a small area of ​​the through hole, which can accelerate the uniformity and efficiency of the gas in the shell being discharged to the outside during the process of disassembly and separation of the fastener and the seal thereon from the connecting part, and also can improve the uniformity and efficiency of filling the electrolyte into the shell.

[0029] In some embodiments, a mounting hole is opened on the end cover, and the connecting member is arranged in the mounting hole and forms an integral structure with the end cover.

[0030] Such an arrangement can facilitate the positioning and connection of the connector and the end cover to form an integrated structure.

[0031] In a second aspect, the present application provides a battery, comprising the battery cell described above.

[0032] In a third aspect, the present application provides an electrical device, wherein the electrical device comprises the battery described above.

[0033] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0035] Figure 1 A schematic diagram of the structure of a vehicle according to an embodiment of the present application.

[0036] Figure 2 This is a structural exploded view of a battery according to an embodiment of the present application.

[0037] Figure 3 Schematic diagram of the structure of the battery of the embodiment of the present application.

[0038] Figure 4 This is a structural exploded view of a battery cell according to an embodiment of the present application.

[0039] Figure 5 It is a schematic structural diagram of the end cover assembly of an embodiment of the present application.

[0040] Figure 6 This is a schematic diagram of the front structural view of the end cover assembly of an embodiment of the present application.

[0041] Figure 7 It is a schematic cross-sectional structural diagram of the end cover assembly of an embodiment of the present application.

[0042] Figure 8 for Figure 7 A partial enlarged view of point A in the middle.

[0043] Fig. 9 This is a structural exploded view of the end cover assembly of an embodiment of the present application.

[0044] Fig.10 for Fig. 9 A partial enlarged view of point B in the middle.

[0045] Fig.11 This is a schematic diagram of the main structure of the connecting member of an embodiment of the present application.

[0046] Fig.12 This is a schematic diagram of the bottom view of the connecting member of an embodiment of the present application.

[0047] Explanation of the reference numerals: battery cell 10; vehicle 20; battery 30; case 31; first case 31a; second case 31b; shell 100; opening 110; electrode assembly 200; end cover assembly 300; end cover 310; connector 311; through hole 3111; convex portion 3112; limiting portion 3113; stop strip 3113a; vent 3113b; mounting hole 312; sealing assembly 320; fastener 321; cover cavity 3211; flange portion 3212; sealing member 322; dustproof member 330; rod portion 331; head portion 332; exhaust gap 340; positive electrode terminal 350; negative electrode terminal 360. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0050] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0052] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0053] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0054] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0055] In the related art, when a battery cell is in use, gas generated by chemical reactions in the battery cell will remain inside the shell. The gas inside the shell will cause the shell size to expand, affecting the pressure and size of the battery composed of multiple battery cells, and having a negative impact on the performance of the battery cell and the battery composed of the battery cell. In addition, the battery cell in the assembled state cannot be filled with electrolyte from the outside, which affects the service life of the battery cell.

[0056] Based on this, in order to solve the problem that the gas generated in the shell of the current battery cell causes the shell size to expand and reduce the performance of the battery cell and the battery, and the problem that the battery cell in the assembled state cannot be filled with electrolyte from the outside, which affects the service life of the battery cell, one or more embodiments of the present application provide a battery cell, wherein the end cover assembly of the battery cell includes an end cover and a sealing assembly, the end cover has a connector, and a through hole for exhaust is opened on the connector, and the through hole is connected to the inside of the shell. The sealing assembly includes a fastener and a sealing member connected to the fastener, and the fastener and the connector are detachably connected so that the sealing member can interfere with the through hole to seal the through hole.

[0057] The battery cell provided in the present application is arranged in coordination with the end cover and the sealing assembly. During the normal use of the battery cell, the fastener and the connector form a stable detachable connection, so that the fastener and the connector are detachably connected, and the shell is in a stable sealed state. When the battery cell needs to be vented or injected, the fastener can be detached from the connector, so that the fastener drives the seal thereon to detach from the through hole, so that the gas in the shell can be discharged outward through the through hole, reducing the effect of gas expansion on the performance of the battery cell and the battery composed of the battery cell. Moreover, the gas in the shell will not contact the fastener and the seal thereon when it is discharged, which can reduce the impact of air pressure on the fastener and the seal thereon, and increase the service life of the fastener and the seal thereon. In addition, it is also possible to inject electrolyte into the shell through the through hole to extend the service life of the battery cell and the battery composed of the battery cell.

[0058] The battery cells provided in the present application can be used in, but are not limited to, electrical devices such as vehicles, ships or aircraft.

[0059] The present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0060] For the convenience of description, the following embodiments are described by taking the electric device provided in the present application as a vehicle as an example.

[0061] See also Figure 1 , Figure 1 Schematic diagram of the structure of a vehicle according to an embodiment of the present application. The vehicle 20 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle, etc. A battery 30 is provided inside the vehicle 20, and the battery 30 may be provided at the bottom, the head or the tail of the vehicle 20. The battery 30 may be used to power the vehicle 20, for example, the battery 30 may be used as an operating power source for the vehicle 20.

[0062] See also Figure 2 , Figure 2 This is a structural breakdown diagram of the battery of an embodiment of the present application. In some embodiments of the present application, the battery 30 can not only serve as an operating power source for the vehicle 20, but also serve as a driving power source for the vehicle 20, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 20.

[0063] The battery 30 mentioned in the embodiment of the present application refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity. When there are multiple battery cells 10, the multiple battery cells 10 are connected in series, in parallel or in hybrid connection through a busbar.

[0064] See also Figure 3 In some embodiments, the battery 30 may be a battery module. When there are multiple battery cells 10, the multiple battery cells 10 are arranged and fixed to form a battery module.

[0065] In some embodiments, the battery 30 may be a battery pack, which includes a case 31 and battery cells 10 , wherein the battery cells 10 or battery modules are accommodated in the case 31 .

[0066] The box 31 can adopt a variety of structures. In some embodiments, the box 31 can include a first box 31a and a second box 31b, the first box 31a and the second box 31b cover each other, and the first box 31a and the second box 31b jointly define a storage space for accommodating the battery cell 10. The first box 31a can be a plate-like structure, and the first box 31a covers the opening side of the second box 31b, so that the first box 31a and the second box 31b jointly define a storage space. Of course, the box 31 formed by the first box 31a and the second box 31b can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0067] In some embodiments, the box 31 can be used as part of the chassis structure of the vehicle 20. For example, part of the box 31 can become at least a part of the floor of the vehicle 20, or part of the box 31 can become at least a part of the cross beam and longitudinal beam of the vehicle 20.

[0068] In some embodiments, the battery 30 may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0069] In the battery 30, there can be multiple battery cells 10, and the multiple battery cells 10 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. The multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 10 is accommodated in the box 20; of course, the battery 30 can also be a battery module formed by connecting multiple battery cells 10 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 20. The battery 30 can also include other structures, for example, the battery 30 can also include a busbar component for realizing electrical connection between the multiple battery cells 10.

[0070] See also Figure 4 , Figure 4This is a structural exploded view of a battery cell according to an embodiment of the present application.

[0071] The battery cell 10 is the smallest unit of the battery, and the structure of the battery cell 10 includes a housing 100, an electrolyte, and an electrode assembly 200. The electrode assembly 200 is a component where electrochemical reactions occur in the battery cell 10, and the electrode assembly 200 includes a positive electrode sheet, a negative electrode sheet, and a separator. The housing 100 may include one or more electrode assemblies 200, which are mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets.

[0072] The shell 100 is a structure with an opening 110 at one end and a hollow interior. The electrode assembly 200 is disposed inside the shell 100, and the end cap assembly 300 is covered at the opening 110 of the shell 100. The end cap assembly 300 covers the opening 110 at the opening 110 to form the internal environment of the battery cell 10. Of course, the end cap 310 of the end cap assembly 300 and the shell 100 can also be integrated. Specifically, the end cap 310 and the shell 100 can form a common connection surface before other components are put into the shell. When the interior of the shell 100 needs to be encapsulated, the end cap 310 covers the shell 100. The shell 100 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 100 can be determined according to the specific shape and size of the electrode assembly 200. The material of the shell 100 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0073] See also Figures 5 to 12 , Figure 5 is a schematic structural diagram of an end cap assembly according to an embodiment of the present application, Figure 6 This is a schematic diagram of the front view of the end cover assembly of an embodiment of the present application. Figure 7 is a schematic cross-sectional structural diagram of an end cap assembly according to an embodiment of the present application, Figure 8 for Figure 7 A partial enlarged view of the middle A. Fig. 9 This is a structural exploded view of the end cover assembly of an embodiment of the present application. Fig.10 for Fig. 9 A partial enlarged view of point B in the middle. Fig.11 This is a schematic diagram of the main structure of the connecting member of the embodiment of the present application. Fig.12 This is a schematic diagram of the bottom view of the connecting member of an embodiment of the present application.

[0074] The embodiment of the present application provides a battery cell 10 , which includes a housing 100 , an electrode assembly 200 , and an end cap assembly 300 .

[0075] The housing 100 has an opening 110 , and the electrode assembly 200 is disposed in the housing 100 . The end cap assembly 300 covers the opening 110 .

[0076] The end cover assembly 300 includes an end cover 310 and a sealing assembly 320. The end cover 310 has a connecting member 311, and a through hole 3111 for exhaust is formed on the connecting member 311, and the through hole 3111 is communicated with the interior of the housing 100.

[0077] The sealing assembly 320 includes a fastener 321 and a sealing member 322 connected to the fastener 321 . The fastener 321 is detachably connected to the connecting member 311 , so that the sealing member 322 seals the through hole 3111 .

[0078] In this application, see Figure 7 and Figure 8 The connector 311 can be integrally formed with the end cover 310 or can be detachably formed. It should be noted that the connector 311 partially protrudes from the side of the end cover 310 away from the housing 100 so as to form a detachable connection with the fastener 321. The shape of the connector 311 can be a regular body of revolution, such as a column, which is easy to process and shape.

[0079] The shape of the through hole 3111 on the connector 311 includes but is not limited to a cylindrical shape, a step shape, other special shapes, etc. It should be noted that when the end cover assembly 300300 covers the opening 110 of the housing 100, the through hole 3111 on the connector 311 is connected to the interior of the housing 100, so that the through hole 3111 can be vented and the electrolyte can be added into the housing 100 through the through hole 3111.

[0080] See also Figure 5 and Figure 6 The end cap 310 is also provided with a positive electrode terminal 350 and a negative electrode terminal 360, which can be used to be electrically connected to the electrode assembly 200 to output or input the electric energy of the battery cell 10. The positive electrode terminal 350, the matching structure formed by the sealing assembly 320 and the connector 311, and the negative electrode terminal 360 are arranged along the length direction of the end cap 310.

[0081] In the sealing assembly 320 of the present application, the detachable connection between the fastener 321 and the connector 311 may be, but is not limited to, threaded connection, snap-on connection, plug-in connection, etc.

[0082] The seal 322 can be constructed as an elastic structure, and its material can be rubber, silicone, etc., so that the seal 322 has a certain ability to deform and recover deformation. The seal 322 can be snapped, embedded in the fastener 321, or can be integrally formed with the fastener 321. The shape of the seal 322 is not limited. The vertical projection of the through hole 3111 on the connecting member 311 relative to the end cover 310 is within the vertical projection of the seal 322 relative to the end cover 310, so that the seal 322 can completely cover and seal the through hole 3111.

[0083] See also Figure 7 and Figure 8 It should be noted that when the fastener 321 forms a stable connection with the connector 311, the fastener 321 presses the seal 322 toward the housing 100, so that the seal 322 interferes with the through hole 3111 on the sealing connector 311, so that the housing 100 is in a stable sealing state.

[0084] In the present application, when it is necessary to vent the battery cell 10, the fastener 321 is directly disassembled and separated from the connector 311, so that the seal 322 is detached together with the fastener 321 to release the interference seal of the through hole 3111, so that the gas in the housing 100 can be discharged outward through the through hole 3111, reducing the effect of gas expansion on the performance of the battery cell 10 and the battery 30 composed of the battery cell 10. In addition, electrolyte can be injected into the housing 100 through the through hole 3111 to extend the service life of the battery cell 10 and the battery 30 composed of the battery cell 10.

[0085] It is not difficult to understand that the battery cell 10 of the embodiment of the present application is arranged in cooperation with the end cover 310 and the sealing assembly 320. During the normal use of the battery cell 10, the fastener 321 forms a stable detachable connection with the connector 311, so that the fastener 321 and the connector 311 are detachably connected, and the housing 100 is in a stable sealed state. When the battery cell 10 needs to be vented or injected, the fastener 321 can be detached from the connector 311, so that the fastener 321 drives the sealing member 322 thereon to detach from the through hole 3111, so that the gas in the housing 100 can be discharged outward through the through hole 3111, reducing the influence of gas expansion on the battery cell 10 and the performance of the battery 30 composed of the battery cell 10. Moreover, when the gas in the housing 100 is discharged, it will not contact the fastener 321 and the sealing member 322 thereon, which can reduce the impact of air pressure on the fastener 321 and the sealing member 322 thereon, and improve the service life of the fastener 321 and the sealing member 322 thereon. In addition, electrolyte can be injected into the housing 100 through the through hole 3111 to extend the service life of the battery cell 10 and the battery 30 composed of the battery cell 10 .

[0086] In some embodiments of the present application, see Figure 7 and Figure 8 The sealing member 322 is constructed as an elastic structure, and the fastener 321 is configured to provide a pressing force to the sealing member 322 toward the connecting member 311 when connected with the connecting member 311.

[0087] Specifically, the sealing member 322 is configured as a rubber pad or a plastic pad structure, and the sealing member 322 is disposed on a side of the fastener 321 close to the end cover 310 .

[0088] It is easy to understand that when the fastener 321 is connected to the connecting member 311, the fastener 321 provides a pressing force toward the connecting member 311 to the sealing member 322, causing the sealing member 322 to be elastically deformed, so as to press the sealing member 322 against the end face of the through hole 3111, so that the sealing member 322 interference seals the through hole 3111, and the sealing member 322 always maintains a fixed state of sealing the through hole 3111, so that the shell 100 as a whole is in a sealed state, thereby improving the sealing effect of the through hole 3111.

[0089] In addition, in some embodiments, see Figure 8 The through hole 3111 on the connecting member 311 is a cylindrical hole, and correspondingly, the sealing member 322 is a circular sealing gasket. Moreover, the vertical projection of the through hole 3111 relative to the end cover 310 is within the vertical projection of the sealing member 322 relative to the end cover 310, so that the sealing member 322 can be pressed against the end surface of the through hole 3111 under the pressing action of the fastener 321, so as to completely cover and seal the through hole 3111, thereby improving the sealing effect of the sealing member 322 on the through hole 3111.

[0090] In some embodiments of the present application, see Figure 7 , Figure 8 , Fig. 9 and Fig.10 A covering cavity 3211 is formed on the fastener 321 , and the sealing member 322 is accommodated in the covering cavity 3211 . The fastener 321 is sleeved on the connecting member 311 and the sealing member 322 is pressed against the connecting member 311 to seal the through hole 3111 .

[0091] Specifically, see Fig.10 The fastener 321 is configured as a cover structure, so that the fastener 321 forms a cover cavity 3211 with an opening toward the connector 311, and the top of the cover cavity 3211 is sealed. The seal 322 can be pre-installed in the cover cavity 3211 by snap-fitting, embedding, etc. and abuts against the top inner wall of the cover cavity 3211.

[0092] In this arrangement, when the fastener 321 is sleeved on the connecting member 311, the sealing member 322 is respectively abutted against the connecting member 311 and the fastener 321 on two opposite sides along its thickness direction so as to be clamped and deformed, thereby being pressed against the end face of the corresponding through hole 3111 on the connecting member 311, thereby achieving an interference seal for the through hole 3111.

[0093] It is not difficult to understand that by forming a covering cavity 3211 on the fastener 321, the fastener 321 and the connecting member 311 are tightly fitted together, and the seal 322 is accommodated in the covering cavity 3211, so that the fastener 321 forms a covering protection for the seal 322, reducing the probability of external water vapor entering the fastener 321 and directly contacting the seal 322 to cause oxidation corrosion to the seal 322, thereby improving the structural stability of the seal 322 and correspondingly improving the sealing effect of the seal 322 on the through hole 3111.

[0094] Further, see Figure 8 and Fig.10 A convex portion 3112 is formed on the connecting member 311, which protrudes from the side of the end cover 310 away from the shell 100. The through hole 3111 penetrates the convex portion 3112 along the axial direction. The cavity 3211 is threadedly connected with the convex portion 3112 so that the sealing member 322 is interference fit with the top surface of the convex portion 3112.

[0095] Specifically, the connector 311 is constructed as a hollow cylinder that passes through from top to bottom, and the connector 311 forms an integral structure with the end cover 310. Correspondingly, the portion of the connector 311 that protrudes from the end cover 310 away from the housing 100 is the convex portion 3112 of the connector 311, and the hollow cavity of the convex portion 3112 forms the through hole 3111, and the convex portion 3112 is formed with an external thread.

[0096] Accordingly, the fastener 321 is constructed as a columnar cover structure with an opening toward the connecting member 311. The fastener 321 can be understood as a nut structure, and the internal thread on the fastener 321 is formed on the inner wall of the cover cavity 3211.

[0097] In this way, when the fastener 321 is correspondingly sleeved on the protrusion 3112 of the connecting member 311 and forms a threaded connection with the protrusion 3112, the seal 322 in the cover cavity 3211 of the fastener 321 is pressed against the top surface of the protrusion 3112 by the fastener 321, so that the seal 322 forms an interference fit with the top surface of the protrusion 3112, thereby achieving sealing of the through hole 3111.

[0098] When the battery cell 10 needs to be vented, the fastener 321 is screwed out from the protrusion 3112 of the connector 311, so that the fastener 321 can drive the seal 322 thereon to separate from the connector 311, release the seal of the through hole 3111, and allow the air pressure of the shell 100 to be directly discharged outward through the through hole 3111 to achieve venting.

[0099] At the same time, electrolyte can be directly added into the housing 100 through the through hole 3111 to extend the service life of the battery cell 10 .

[0100] It is easy to understand that, by forming a convex portion 3112 protruding from the side of the end cover 310 away from the housing 100 on the connector 311, the housing cavity 3211 of the fastener 321 is sleeved on the convex portion 3112 and threadedly connected with the convex portion 3112, so that the seal 322 can be kept in a compressed state when the fastener 321 and the connector 311 are in a stable connection, thereby maintaining a stable seal on the through hole 3111. At the same time, the through hole 3111 can be opened by screwing the fastener 321 directly out of the connector 311, so that the gas in the housing 100 can be discharged and the electrolyte can be added to the housing 100, simplifying the exhaust process and the liquid injection process.

[0101] In some embodiments of the present application, see Figure 7 , Figure 8 and Fig.10 The bottom end of the fastener 321 is provided with a flange portion 3212 along the circumferential direction and is buckled with the side of the end cover 310 away from the shell 100.

[0102] Specifically, the fastener 321 is in a columnar cover structure, and the flange portion 3212 is integrally formed on the bottom circumferential edge of the fastener 321 , and the flange portion 3212 is in an annular strip structure.

[0103] It should be noted that, after the fastener 321 is sleeved on the protrusion 3112 on the connector 311 and forms a stable threaded connection with the protrusion 3112, the flange portion 3212 at the bottom of the fastener 321 is buckled on the end cover 310, so that the flange portion 3212 fits tightly against the surface of the end cover 310, so that the fastener 321 forms a tight covering for the protrusion 3112 on the connector 311, reducing the gap between the fastener 321 and the connector 311 and between the fastener 321 and the end cover 310, reducing the probability of external water vapor entering the connector 311 and the fastener 321, and improving the sealing effect.

[0104] In some embodiments of the present application, see Figure 7 , Figure 8 , Fig. 9 and Fig.10The end cover assembly 300 further includes a dustproof member 330 , which is limitedly disposed in the through hole 3111 and forms an exhaust gap 340 with the through hole 3111 .

[0105] It should be noted that the dustproof piece 330 is limitedly inserted into the through hole 3111, which can be understood as the dustproof piece 330 can maintain a static state inserted into the through hole 3111, and will not fall into the interior of the shell 100 through the through hole 3111 due to gravity without restriction. A limiting portion 3113 that can be used for the dustproof piece 330 to resist can be provided in the through hole 3111 to achieve the stop limit of the dustproof piece 330.

[0106] Specifically, the dustproof piece 330 is rod-shaped, and the outer diameter of the dustproof piece 330 is smaller than the outer diameter of the through hole 3111 , so that after the dustproof piece 330 is inserted into the through hole 3111 , an exhaust gap 340 is formed between the dustproof piece 330 and the through hole 3111 .

[0107] It should be noted that when it is necessary to remove and separate the fastener 321 and the seal 322 thereon from the connecting member 311 in order to open the through hole 3111 for exhaust or liquid injection, after the fastener 321 drives the seal 322 thereon to separate from the connecting member 311, the dustproof member 330 is still in a state of being limitedly penetrated in the through hole 3111. At this time, the gas in the shell 100 can still be discharged outward through the exhaust gap 340.

[0108] Since the dustproof member 330 is limitedly disposed in the through hole 3111, the aperture of the through hole 3111 is reduced, and the probability of foreign matter such as external dust entering the housing 100 through the through hole 3111 can be reduced, thereby playing a certain dustproof role.

[0109] When the exhaust efficiency or the liquid injection efficiency needs to be improved, the dustproof member 330 can be directly removed from the through hole 3111 to make the through hole 3111 completely unobstructed.

[0110] It is not difficult to understand that the present application provides a dust-proof part 330 in a limited position in the through hole 3111. When the fastener 321 drives the seal 322 thereon to be disassembled and separated from the connecting part 311, the dust-proof part 330 can be used to stop external dust particles, thereby reducing the probability of external dust entering the through hole 3111 during the disassembly and separation of the fastener 321 and the connecting part 311.

[0111] Further, see Figure 8 and Fig.10 The dustproof member 330 includes a rod portion 331 and a head portion 332 integrally connected to the rod portion 331, the rod portion 331 is inserted into the through hole 3111, the head portion 332 is flush with the end surface of the through hole 3111, and the head portion 332 is constructed as an arc structure protruding toward the shell 100 to form an exhaust gap 340 with the through hole 3111.

[0112] Specifically, the rod portion 331 of the dustproof member 330 is cylindrical, and the head portion 332 is in the shape of an inverted umbrella, so that the head portion 332 of the dustproof member 330 forms an arc-shaped surface convex toward the housing 100 .

[0113] It should be understood that the outer diameter of the head 332 of the dustproof piece 330 is larger than the outer diameter of the rod 331, and the outer diameter of the head 332 of the dustproof piece 330 is smaller than the inner diameter of the through hole 3111, so that the dustproof piece 330 as a whole can be located inside the through hole 3111, and the head 332 of the dustproof piece 330 can be flush with the end face of the through hole 3111. In this way, the size of the exhaust gap 340 is correspondingly reduced, and the dustproof piece 330's blocking and protective effect on external dust is improved. At the same time, the dustproof piece 330 will not form structural interference with the seal 322.

[0114] It can be understood that when the dustproof piece 330 is entirely inserted into the interior of the through hole 3111 and the head 332 of the dustproof piece 330 is flush with the end face of the through hole 3111, the difference between the outer diameter of the head 332 of the dustproof piece 330 and the inner diameter of the through hole 3111 is the width of the exhaust gap 340, so that during the process of disassembling and separating the fastener 321 and the sealing piece 322 thereon from the connecting piece 311, the gas in the shell 100 can be discharged outward through the exhaust gap 340 simultaneously, thereby improving the exhaust efficiency.

[0115] When the exhaust efficiency needs to be further improved, a negative pressure device can be connected to the through hole 3111, and the dustproof piece 330 passed through the through hole 3111 can be pulled out by relying on the negative pressure device. By constructing the head 332 of the dustproof piece 330 as an arc-shaped structure protruding toward the shell 100, the head 332 of the dustproof piece 330 can also more easily form negative pressure when it is pulled out, which is beneficial for the negative pressure device to pull the dustproof piece 330 out of the through hole 3111, thereby improving the exhaust efficiency.

[0116] In some embodiments of the present application, see Figure 8 , Fig.11 and Fig.12 A limiting portion 3113 is provided on the connecting member 311 . The limiting portion 3113 is located in the through hole 3111 and is configured to allow the airflow in the through hole 3111 to pass through. The dustproof member 330 abuts against the limiting portion 3113 .

[0117] Specifically, the limiting portion 3113 is arranged close to the bottom of the connecting piece 311, so that the dustproof piece 330 can have a sufficient insertion depth without protruding from the upper end surface of the through hole 3111, thereby preventing the dustproof piece 330 from forming structural interference with the sealing piece 322, and a plurality of air vents 3113b for air to pass through can be formed on the limiting portion 3113.

[0118] It is not difficult to understand that by providing a limiting portion 3113 in the through hole 3111 on the connecting piece 311 and constructing a structure that can allow the airflow in the through hole 3111 to pass through, on the one hand, the dustproof piece 330 can be limited and penetrated inside the through hole 3111, and the dustproof piece 330 can be pulled out by an external force. On the other hand, during the process of disassembly and separation of the fastener 321 and the sealing piece 322 thereon from the connecting piece 311, the gas in the shell 100 can be synchronously discharged outward through the exhaust gap 340, thereby improving the exhaust efficiency.

[0119] Further, see Fig.12 The limiting portion 3113 includes a plurality of stop bars 3113a, all of which are connected to the inner wall of the through hole 3111 and are radially distributed, and a vent 3113b for air flow to pass through is formed between two adjacent stop bars 3113a.

[0120] Specifically, all the stopper strips 3113a are integrally formed with the connecting member 311. One end of all the stopper strips 3113a away from the inner wall of the through hole 3111 is connected to the center of the through hole to form an abutment surface for the rod portion 331 of the dustproof member 330 to abut, and the rod portion 331 of the dustproof member 330 is vertically inserted against the abutment surface.

[0121] Such arrangement allows the dustproof member 330 to be readily stopped by the limiting portion 3113, while also allowing the limiting portion 3113 to occupy only a small portion of the area of ​​the through hole 3111, thereby accelerating the uniformity and efficiency of the gas in the shell 100 being discharged outward during the process of disassembly and separation of the fastener 321 and the seal 322 thereon from the connecting member 311, and also improving the uniformity and efficiency of filling the electrolyte into the shell 100.

[0122] In some embodiments of the present application, see Fig.10 A mounting hole 312 is opened on the end cover 310 , and the connecting piece 311 is arranged in the mounting hole 312 and forms an integral structure with the end cover 310 .

[0123] Specifically, the mounting hole 312 is provided through the end cover 310 , and the connector 311 can be installed in the mounting hole 312 by welding, bonding or other connection methods to form an integrated structure with the end cover 310 .

[0124] By opening the mounting hole 312 on the end cover 310 , the connector 311 can be conveniently positioned and connected to the end cover 310 to form an integrated structure.

[0125] See also Figures 1 to 12 The embodiments of the present application provide a battery cell 10, a battery 30 and an electrical device. The battery 30 includes the battery cell 10 of any of the above embodiments, and the electrical device includes the battery 30 of any of the above embodiments.

[0126] The battery cell 10 includes: a shell 100 having an opening 110; an electrode assembly 200 disposed in the shell 100; an end cover assembly 300 covering the opening 110; wherein the end cover assembly 300 includes: an end cover 310 having a connector 311, the connector 311 having a through hole 3111 for exhaust, the through hole 3111 being connected to the interior of the shell 100; a sealing assembly 320 including a fastener 321 and a sealing member 322 connected to the fastener 321, the fastener 321 and the connector 311 being detachably connected so that the sealing member 322 seals the through hole 3111.

[0127] The battery cell 10 of the embodiment of the present application is provided by the end cap 310 and the sealing assembly 320. During the normal use of the battery cell 10, the fastener 321 forms a stable detachable connection with the connector 311, so that the fastener 321 and the connector 311 are detachably connected, and the housing 100 is in a stable sealed state. When the battery cell 10 needs to be vented or injected, the fastener 321 can be detached from the connector 311, so that the fastener 321 drives the sealing member 322 thereon to detach from the through hole 3111, so that the gas in the housing 100 can be discharged outward through the through hole 3111, reducing the influence of gas expansion on the battery cell 10 and the performance of the battery 30 composed of the battery cell 10. Moreover, when the gas in the housing 100 is discharged, it will not contact the fastener 321 and the sealing member 322 thereon, which can reduce the impact of air pressure on the fastener 321 and the sealing member 322 thereon, and improve the service life of the fastener 321 and the sealing member 322 thereon. In addition, electrolyte can be injected into the housing 100 through the through hole 3111 to extend the service life of the battery cell 10 and the battery 30 composed of the battery cell 10 .

[0128] The battery 30 of the embodiment of the present application can reduce the influence of gas expansion on the performance of the battery cell 10 and the battery 30 composed of the battery cell 10 through the arrangement of the end cover assembly 300 of the above-mentioned battery cell 10, and can also inject electrolyte into the shell 100 to extend the service life of the battery cell 10 and the battery 30 composed of the battery cell 10.

[0129] The electric device of the embodiment of the present application improves the life and reliability of the electric device by disposing the battery 30.

[0130] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0131] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery cell, characterized in that: include: a housing having an opening; An electrode assembly is disposed in the housing; An end cover assembly, covering the opening; Wherein, the end cover assembly comprises: The end cover has a connecting piece, the connecting piece is provided with a through hole for exhaust, and the through hole is connected to the interior of the shell; The sealing assembly comprises a fastener and a sealing member connected to the fastener, wherein the fastener and the connecting member are detachably connected so that the sealing member seals the through hole.

2. The battery cell according to claim 1, characterized in that: The sealing member is constructed as an elastic structure, and the fastener is configured to provide a pressing force to the sealing member toward the connecting member when the fastener is connected with the connecting member.

3. The battery cell according to claim 1, characterized in that: A covering cavity is formed on the fastener, the sealing member is accommodated in the covering cavity, the fastener is sleeved on the connecting member and the sealing member is pressed against the connecting member to seal the through hole.

4. The battery cell according to claim 3, characterized in that: The connector is formed with a convex portion protruding from the end cover away from the housing, the through hole penetrates along the axial direction of the convex portion, and the cover cavity is threadedly connected to the convex portion so that the seal is interference fit with the top surface of the convex portion.

5. The battery cell according to any one of claims 2 to 4, characterized in that: The bottom end of the fastener is provided with a flange portion along the circumferential direction and is buckled with a side of the end cover away from the shell.

6. The battery cell according to any one of claims 1 to 4, characterized in that: The end cover assembly further includes a dustproof member, which is limitedly disposed through the through hole and forms an exhaust gap between the through hole and the dustproof member.

7. The battery cell according to claim 6, characterized in that: The dustproof part includes a rod and a head integrally connected to the rod, the rod is inserted into the through hole, the head is flush with the end surface of the through hole, and the head is constructed as an arc structure protruding toward the shell to form the exhaust gap with the through hole.

8. The battery cell according to claim 7, characterized in that: The connecting member is provided with a limiting portion, the limiting portion is located in the through hole and is configured to allow the airflow in the through hole to pass through, and the dustproof member abuts against the limiting portion.

9. The battery cell according to claim 8, characterized in that: The limiting portion includes a plurality of stop bars, all of which are connected to the inner wall of the through hole and are radially distributed, and a vent for air flow to pass through is formed between two adjacent stop bars.

10. The battery cell according to any one of claims 1 to 4, characterized in that: The end cover is provided with a mounting hole, and the connecting piece is arranged in the mounting hole and forms an integral structure with the end cover.

11. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 10.

12. An electrical device, characterized in that: Comprising the battery of claim 11, the battery is used to provide electrical energy.

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