Battery monomer, sealing nail, battery, energy storage device and power utilization device

Abstract

The utility model discloses a battery monomer, a sealing nail, a battery, an energy storage device and a power utilization device, the battery monomer comprises a shell, a first sealing element and a second sealing element, and the shell forms a liquid injection hole; the first sealing piece is at least partially located in the liquid injection hole to block the liquid injection hole; the second sealing element is fixedly connected to the shell and covers the first sealing element; wherein the first sealing element is fixedly connected with the second sealing element. The second sealing element and the first sealing element are fixedly connected into a whole, in the process of sealing the liquid injection hole, the second sealing element is assembled while the first sealing element is plugged into the liquid injection hole, the assembling time is saved, the sealing efficiency is improved, the possibility of plugging leakage of the first sealing element does not exist, the sealing performance is improved, and the sealing effect is improved. And the risk of liquid leakage caused by plugging leakage of the first sealing element is reduced. Therefore, the sealing efficiency and the sealing performance of the liquid injection hole can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery cells, sealing nails, batteries, energy storage devices and electrical devices. Background Art

[0002] New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in areas such as energy storage.

[0003] During the battery manufacturing process, the injection hole on the outer shell needs to be sealed after the electrolyte is injected to prevent the electrolyte from overflowing. The efficiency of the injection hole sealing will affect the manufacturing efficiency of the battery, and poor sealing of the injection hole will lead to the risk of leakage during the use of the battery. Therefore, how to improve the sealing efficiency and sealing of the injection hole is one of the topics that the industry needs to study. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a battery cell, a sealing nail, a battery, an energy storage device and an electrical device that can improve the sealing efficiency and sealing performance of the injection hole.

[0005] This application is implemented through the following technical solutions.

[0006] A first aspect of the present application provides a battery cell, comprising:

[0007] The shell forms a liquid injection hole;

[0008] A first sealing member, at least partially located in the injection hole to block the injection hole;

[0009] A second sealing member, fixedly connected to the housing and covering the first sealing member;

[0010] Wherein, the first sealing member and the second sealing member are fixedly connected.

[0011] The second seal and the first seal are fixedly connected as a whole. During the process of sealing the injection hole, the first seal is inserted into the injection hole while the second seal is assembled at the same time, which saves assembly time and improves sealing efficiency. Moreover, the present application does not have the possibility of leaking the first seal, thereby improving the sealing performance and reducing the risk of leakage caused by leaking the first seal.

[0012] In some embodiments, one of the first seal and the second seal is provided with a convex portion, and the other is provided with a concave portion, and the convex portion and the concave portion are connected with each other in a concave-convex fitting manner.

[0013] The convex part and the concave part are connected in a concave-convex matching manner, which improves the firmness of the connection between the first sealing member and the second sealing member, thereby further improving the sealing performance.

[0014] In some embodiments, the convex portion includes a main body and a snap-fitting protrusion arranged on the outer peripheral side of the main body, the groove includes an insertion groove and a snap-fitting groove opened on the inner side wall of the insertion groove, the main body is arranged in the insertion groove, and the snap-fitting protrusion is snap-fitted in the snap-fitting groove.

[0015] In this way, the main body and the plug-in groove cooperate with each other to strengthen the radial constraint of the second seal and the first seal on the first seal; the snap-in protrusion and the snap-in groove snap into each other to strengthen the axial constraint of the second seal and the first seal on the first seal, further improving the firmness of the connection between the second seal and the first seal, thereby improving the sealing performance.

[0016] In some embodiments, there are more than two protrusions, and there are more than two grooves, and the two or more protrusions correspond to the two or more grooves in a one-to-one manner.

[0017] In this way, the connection firmness between the first sealing member and the second sealing member is improved.

[0018] In some embodiments, the first sealing member includes a sealing portion and an introduction portion, one end of the sealing portion is connected to the introduction portion, and the other end is formed with the convex portion or the groove, the sealing portion is interference fit in the injection hole, and the outer peripheral surface of the introduction portion includes a conical introduction surface.

[0019] The sealing part is inserted into the injection hole to seal the injection hole. The conical introduction surface of the introduction part facilitates the first sealing member to be aligned and inserted into the injection hole during the assembly of the sealing nail, thereby improving the convenience and efficiency of assembly.

[0020] In some embodiments, the outer peripheral surface of the sealing portion includes a cylindrical surface.

[0021] The cylindrical surface makes the diameter of the sealing part uniform, improves the uniformity of the interference fit between the sealing part and the injection hole, and improves the sealing performance.

[0022] In some embodiments, the first seal is injection molded on the second seal, or the first seal and the second seal are interference fit.

[0023] The first seal is injection molded on the second seal, which improves the strength of the connection between the two and makes the connection between the two more secure. The convex part is interference-fitted in the groove, so that the first seal and the second seal are interference-fitted, which improves the connection strength between the first seal and the second seal and makes the connection between the two more secure.

[0024] In some embodiments, the material of the first sealing member is any one of fluororubber, silicone rubber, polyvinylidene fluoride, polytetrafluoroethylene, polyethylene and polypropylene.

[0025] The above materials can make the first sealing member seal on the liquid injection hole, and the material cost is low and easy to obtain.

[0026] In some embodiments, the second sealing member is made of any one of aluminum, aluminum alloy and stainless steel.

[0027] The above materials can realize welding between the second sealing member and the housing, and the material cost is low and easy to obtain.

[0028] The second aspect of the present application provides a sealing nail for a battery cell, comprising: a first sealing member, used to be inserted into the injection hole of the outer shell of the battery cell to seal the injection hole; a second sealing member, used to be fixedly connected to the outer shell and cover the first sealing member; wherein the first sealing member and the second sealing member are fixedly connected.

[0029] The second seal is connected to the first seal as a whole. During the process of sealing the injection hole, the first seal is inserted into the injection hole while the second seal is assembled at the same time, which saves assembly time and improves sealing efficiency. Moreover, the present application does not have the possibility of leaking the first seal, thereby improving the sealing performance and reducing the risk of leakage caused by leaking the first seal.

[0030] In some embodiments, one of the first seal and the second seal is provided with a convex portion, and the other is provided with a concave portion, and the convex portion and the concave portion are connected with each other in a concave-convex fitting manner.

[0031] The convex part and the concave part are connected in a concave-convex matching manner, which improves the firmness of the connection between the first sealing member and the second sealing member, thereby further improving the sealing performance.

[0032] In some embodiments, the convex portion includes a main body and a snap-fitting protrusion arranged on the outer peripheral side of the main body, the groove includes an insertion groove and a snap-fitting groove opened on the inner side wall of the insertion groove, the main body is arranged in the insertion groove, and the snap-fitting protrusion is snap-fitted in the snap-fitting groove.

[0033] In this way, the main body and the plug-in groove cooperate with each other to strengthen the radial constraint of the second seal and the first seal on the first seal; the snap-in protrusion and the snap-in groove snap into each other to strengthen the axial constraint of the second seal and the first seal on the first seal, further improving the firmness of the connection between the second seal and the first seal, thereby improving the sealing performance.

[0034] In some embodiments, there are more than two protrusions, and there are more than two grooves, and the two or more protrusions correspond to the two or more grooves in a one-to-one manner.

[0035] In this way, the connection firmness between the first sealing member and the second sealing member is improved.

[0036] In some embodiments, the first seal is injection molded on the second seal, or the first seal and the second seal are interference fit.

[0037] The first seal is injection molded on the second seal, which improves the strength of the connection between the two and makes the connection between the two more secure. The convex part is interference-fitted in the groove, so that the first seal and the second seal are interference-fitted, which improves the connection strength between the first seal and the second seal and makes the connection between the two more secure.

[0038] A third aspect of the present application provides a battery, comprising a battery box and at least one of the above-mentioned battery cells, wherein the battery cell is accommodated in the battery box.

[0039] Since the battery includes the battery monomer, the battery can improve production efficiency and reduce leakage risk.

[0040] A fourth aspect of the present application provides an energy storage device, which includes the above-mentioned battery cell or the above-mentioned battery.

[0041] Since the energy storage device includes the above-mentioned battery monomer or the above-mentioned battery, the energy storage device can improve production efficiency and reduce the risk of leakage.

[0042] A fifth aspect of the present application provides an electrical device, which includes the above-mentioned battery cell or the above-mentioned battery for providing electrical energy.

[0043] Since the electrical device includes the battery cell or the battery, the electrical device can improve production efficiency and reduce leakage risk.

[0044] Utility Model Effect

[0045] The present application provides a battery cell, a sealing nail, a battery, an energy storage device and an electrical device that can improve the sealing efficiency and sealing performance of a liquid injection hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] 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:

[0047] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0048] Figure 2 A three-dimensional exploded schematic diagram of a battery provided in some embodiments of the present application;

[0049] Figure 3 A three-dimensional exploded schematic diagram of a battery cell provided in some embodiments of the present application;

[0050] Figure 4 A cross-sectional view of a sealing pin provided for some embodiments of the present application;

[0051] Figure 5 A cross-sectional view of a sealing pin provided for some embodiments of the present application;

[0052] Figure 6 A partial cross-sectional view of a sealing pin of a battery cell provided in some embodiments of the present application;

[0053] Figure 7 for Figure 6 The enlarged view of point A in the middle;

[0054] Figure 8 A cross-sectional view of a sealing pin provided for some embodiments of the present application;

[0055] Fig. 9 A cross-sectional view of a sealing pin of a battery cell provided in some embodiments of the present application;

[0056] Fig.10 for Fig. 9 The enlarged view of point B in the middle;

[0057] Fig.11 A schematic diagram of an end portion of a first sealing member of a sealing pin provided in some embodiments of the present application.

[0058] Description of Reference Numerals

[0059] 1000 vehicle; 100 battery; 200 controller; 300 motor; 10 battery box; 11 box cover; 12 box body; 20 battery cell; 21 end cover; 21a electrode terminal; 21b pressure relief mechanism; 22 shell; 23 electrode assembly; 23a pole ear;

[0060] 3 Sealing pin; 31 second sealing member; 32 first sealing member; 321 convex portion; 3211 main body portion; 3212 snap-on protrusion; 322 sealing portion; 3221 cylindrical surface; 323 introduction portion; 3231 conical introduction surface. DETAILED DESCRIPTION

[0061] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0063] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0064] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0065] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0066] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0067] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0068] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0069] Below, this application is described in detail.

[0070] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0071] In the battery manufacturing process, after the electrolyte is injected, the injection hole on the shell needs to be sealed to prevent the electrolyte from overflowing. The inventor of the present application has noticed that, at present, the operation of sealing the injection hole is generally to first insert a glue nail into the injection hole to seal the injection hole, and then install a metal sealing nail, and weld the metal sealing nail to the shell to complete the sealing operation of the injection hole. The sealing operation is divided into two steps, which is not conducive to assembly efficiency. In addition, there is a leak in the glue nail, which cannot be detected from the appearance after welding the sealing nail. There may be a risk of leakage during later use. Therefore, how to improve the sealing efficiency and sealing of the injection hole is an important topic that the industry needs to study.

[0072] The inventor of the present application has discovered through research that by connecting the rubber nail and the metal sealing nail as one, during the process of sealing the injection hole, the metal sealing nail is assembled at the same time as the rubber nail is inserted into the injection hole. The two are assembled in place at the same time, and then the metal sealing nail and the shell can be directly welded. That is, the assembly of the rubber nail and the metal sealing nail to the shell is performed simultaneously. Compared with the prior art of assembling the rubber nail and the metal sealing nail in sequence, the present application saves time and improves sealing efficiency. Moreover, the present application does not have the possibility of missing rubber nails, thereby improving the sealing performance and reducing the risk of leakage caused by missing rubber nails.

[0073] Based on such a design concept, the inventor of the present application designed a battery cell, which includes a shell, a first seal, and a second seal. The shell forms an injection hole; at least a portion of the first seal is located in the injection hole to seal the injection hole; the second seal is fixedly connected to the shell and covers the first seal; the first seal and the second seal are fixedly connected.

[0074] The first seal and the second seal are fixedly connected as a whole. During the process of sealing the injection hole, the first seal is inserted into the injection hole while the second seal is assembled at the same time, which saves assembly time and improves sealing efficiency. Moreover, the present application does not have the possibility of leaking the first seal, improves the sealing performance, and reduces the risk of leakage caused by leaking the first seal.

[0075] The battery cells provided in the embodiments of the present application can be used in, but are not limited to, electrical devices such as vehicles, ships, or aircraft, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships, and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0076] An embodiment of the present application also provides a sealing nail for a battery cell, the sealing nail comprising a first seal and a second seal, the first seal being used to be inserted into the injection hole of the outer shell of the battery cell to seal the injection hole; the second seal being used to be fixedly connected to the outer shell of the battery cell and cover the first seal; the first seal and the second seal are fixedly connected.

[0077] The present application also provides a battery, which may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in hybrid connection through a busbar component.

[0078] In some embodiments of the present application, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0079] In some embodiments of the present application, the battery may be a battery pack, which includes a battery box and battery cells, wherein the battery cells or battery modules are accommodated in the battery box.

[0080] In some embodiments of the present application, the battery box can be used as part of the chassis structure of the vehicle. For example, part of the battery box can become at least a part of the floor of the vehicle, or part of the battery box can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0081] The battery provided in the embodiments of the present application can be used in, but is not limited to, electrical devices such as vehicles, ships or aircraft, such as mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0082] An embodiment of the present application also provides an energy storage device, which includes a battery cell or a battery.

[0083] The energy storage device provided in the embodiment of the present application may be, but is not limited to, an energy storage container, an energy storage cabinet, and the like.

[0084] An embodiment of the present application further provides an electrical device, which includes a battery cell or a battery for providing electrical energy.

[0085] The electric device provided in the embodiment of the present application may be, but is not limited to, a mobile phone, a tablet, a laptop computer, 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.

[0086] In the following embodiments, for the convenience of description, an electric device according to an embodiment of the present application is taken as an example of a vehicle 1000. The following is a description with reference to the accompanying drawings.

[0087] Figure 1 A schematic diagram of the structure of a vehicle 1000 is provided for some embodiments of the present application.

[0088] The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1 As shown, a battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating, and operating power requirements of the vehicle 1000 during driving.

[0089] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0090] Figure 2This is a schematic three-dimensional exploded view of a battery 100 provided in an embodiment of the present application.

[0091] like Figure 2 As shown, the battery 100 includes a battery box 10 and at least one battery cell 20. The battery box 10 is provided with a receiving space, and the at least one battery cell 20 is received in the receiving space.

[0092] In some embodiments of the present application, the battery box 10 includes a box body 12 and a box cover 11 , and the box cover 11 covers the box body 12 , so that the accommodating space is formed between the box body 12 and the box cover 11 .

[0093] The box body 12 may be a hollow structure with one end open, and the box cover 11 may be a plate-like structure, and the box cover 11 covers the open side of the box body 12, so that the box cover 11 and the box body 12 together define a storage space; the box cover 11 and the box body 12 may also be hollow structures with one side open, and the open side of the box cover 11 covers the open side of the box body 12. Of course, the battery box 10 formed by the box cover 11 and the box body 12 may be in various shapes, such as a cylinder, a cuboid, etc.

[0094] In the battery 100, there can be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is placed in the accommodation space formed by the box body 12 and the box cover 11; of course, the battery 100 can also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and are accommodated in the accommodation space formed by the box body 12 and the box cover 11. The battery 100 may also include other structures. For example, the battery 100 may also include a converging component for realizing electrical connection between the multiple battery cells 20.

[0095] In the embodiment of the present application, the battery cell 20 may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0096] The battery cell 20 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0097] Figure 3 A schematic diagram of the exploded structure of a battery cell 20 provided in some embodiments of the present application.

[0098] Please refer to Figure 3The battery cell 20 refers to the smallest unit constituting the battery. The battery cell 20 includes a housing, an electrode assembly 23 and other functional components. The housing includes an end cap 21 and a shell 22.

[0099] The end cap 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the end cap 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 21 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and improved safety performance. Functional components such as electrode terminals 21a can be provided on the end cap 21. The electrode terminal 21a can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20.

[0100] In some embodiments of the present application, the end cap 21 may also be provided with a pressure relief mechanism 21b for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. The material of the end cap 21 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments of the present application, an insulating member may also be provided on the inner side of the end cap 21, and the insulating member may be used to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. Exemplarily, the insulating member may be plastic, rubber, etc.

[0101] The shell 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components. The shell 22 and the end cap 21 can be independent components, and an opening can be set on the shell 22, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap 21 at the opening. Without limitation, the end cap 21 and the shell 22 can also be integrated. Specifically, the end cap 21 and the shell 22 can form a common connection surface before other components are put into the shell, and when the interior of the shell 22 needs to be encapsulated, the end cap 21 covers the shell 22. The shell 22 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 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 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.

[0102] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be included in the housing 22. The electrode assembly 23 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab 23a. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 23a connects the electrode terminal 21a to form a current loop.

[0103] In some embodiments of the present application, an injection hole for injecting electrolyte is provided on the end cover 21 or the shell 22, and the battery cell 20 also includes a sealing nail 3 for sealing the injection hole.

[0104] During the production of the battery, after the battery cell 20 is assembled, electrolyte needs to be injected into the battery cell 20 through the injection hole, and then the injection hole is tightly sealed. The sealing nail 3 provided in the present application can improve the sealing of the injection hole, thereby reducing the risk of leakage during the use of the battery.

[0105] Below, refer to Figures 4 to 11 Some embodiments of the present application are described in detail.

[0106] Figure 4 A cross-sectional view of a sealing pin provided for some embodiments of the present application; Figure 5 A cross-sectional view of a sealing pin provided for some embodiments of the present application; Figure 6 A cross-sectional view of a sealing pin of a battery cell provided in some embodiments of the present application; Figure 7 for Figure 6 The enlarged view of point A in the middle; Figure 8 A cross-sectional view of a sealing pin provided for some embodiments of the present application; Fig. 9 A cross-sectional view of a sealing pin of a battery cell provided in some embodiments of the present application; Fig.10 for Fig. 9 The enlarged view of point B in the middle; Fig.11 A schematic diagram of an end portion of a first sealing member of a sealing pin provided in some embodiments of the present application.

[0107] like Figures 4 to 11 As shown, the sealing nail 3 provided in the embodiment of the present application includes a first seal 32 and a second seal 31, at least a portion of the first seal 32 is located in the injection hole to seal the injection hole; the second seal 31 is fixedly connected to the outer shell of the battery cell 20 and covers the first seal 32; wherein the first seal 32 and the second seal 31 are fixedly connected.

[0108] The first sealing member 32 is a column for sealing the injection hole, which may be, but is not limited to, a rubber nail. In order to improve the sealing performance of the injection hole, the structure of the first sealing member 32 is determined by the structure of the injection hole. For example, when the injection hole is a circular hole, the first sealing member 32 includes a cylinder matching the size of the injection hole, so that after the first sealing member 32 is filled in the injection hole, the two are interference-fitted and evenly matched in the circumferential direction, thereby improving the sealing performance; for another example, when the injection hole is a square hole, the first sealing member 32 includes a square column matching the size of the injection hole, so that after the first sealing member 32 is filled in the injection hole, the two are interference-fitted and evenly matched in the circumferential direction, thereby improving the sealing performance; for the case where the injection hole is of other shapes, the first sealing member 32 includes a structure matching the injection hole, and the specific shape is determined according to the actual situation, and will not be described one by one here. The first sealing member 32 is made of elastic material, and the first sealing member 32 is elastically filled in the injection hole to improve the sealing performance. The material can be fluororubber, silicone rubber, polyvinylidene fluoride, polyvinylidene fluoride, polytetrafluoroethylene, polyethylene, polypropylene, polyvinyl chloride, etc.

[0109] The second seal 31 is a structure for welding on the outer surface of the shell of the battery cell 20, and can be, but not limited to, a metal sealing nail. The second seal 31 can be a T-shaped structure, a sheet structure, or other irregularly shaped structures. The specific shape and size are not specifically limited, as long as it can cover the injection hole and exceed the edge of the injection hole by a sufficient area to be welded with the shell. The second seal 31 is made of metal material to achieve welding between the second seal 31 and the shell, for example, aluminum, aluminum alloy, steel or stainless steel.

[0110] The first seal 32 and the second seal 31 are fixedly connected as a whole, so that in the process of sealing the injection hole, when the first seal 32 of the sealing nail 3 is inserted into the injection hole of the shell, the second seal 31 is also assembled to the shell. After the first seal 32 is inserted into place, the second seal 31 and the shell can be directly welded, that is, the first seal 32 and the second seal 31 are assembled to the shell at the same time. Compared with the sequential assembly actions in the prior art, the present application saves time and improves sealing efficiency. Moreover, the present application does not have the possibility of missing the first seal 32, thereby improving the sealing performance and reducing the risk of leakage caused by missing the first seal 32.

[0111] In some embodiments of the present application, one of the first sealing member 32 and the second sealing member 31 is provided with a convex portion 321 and the other is provided with a groove, and the convex portion 321 and the groove are connected in a concave-convex fitting manner.

[0112] The protrusion 321 is a solid block that can be inserted into the groove. Figure 4As shown, the protrusion 321 may be a solid block formed by a portion of a surface protruding outward; Figure 5 As shown, the convex part 321 can also be the end of one end of a column. The convex part 321 can be a cylindrical solid block, a square column solid block, or a solid block of other shapes, etc.

[0113] The groove is a concave structure that is concave inward relative to the surrounding surface. The concave structure can accommodate the convex portion 321. The shape of the groove is compatible with the shape of the convex portion 321. The groove can be a cylindrical concave structure, a square columnar concave structure, or a concave structure of other shapes, and so on.

[0114] The number of the protrusion 321 and the number of the concave grooves can be one, or can be more than two, and each protrusion 321 and each concave groove are matched one by one.

[0115] The first sealing member 32 and the second sealing member 31 are connected by a concave-convex fit, which improves the firmness of the connection between the two, further improves the sealing performance, and reduces the risk of leakage.

[0116] In some embodiments of the present application, Figure 4 As shown, the second sealing member 31 is provided with a convex portion 321, and the first sealing member 32 is provided with a concave portion 321 and the concave portion 321 and the concave portion 321 are connected to ... and the concave portion 321 are connected to the concave portion 3

[0117] For example, Figure 4 As shown, the convex portion 321 is formed by a portion of the side surface of the second sealing member 31 protruding toward the direction of the first sealing member 32, so that after the convex portion 321 is inserted into the groove, another portion of the side surface of the second sealing member 31 fits the end surface of the first sealing member 32, and the remaining portion of the side surface of the second sealing member 31 fits and is welded to the outer surface of the housing. In this way, the connection firmness between the second sealing member 31 and the first sealing member 32 and the welding firmness between the second sealing member 31 and the housing are improved.

[0118] The convex portion 321 can be arranged at the center position of the second sealing member 31, or at an eccentric position; one convex portion 321 can be arranged, or more than two convex portions 321 can be arranged. The groove can be arranged at the center position of the end surface of the first sealing member 32, or at an eccentric position of the end surface. The size and shape of the convex portion 321 and the groove match, and can be cylindrical, square column or other polygonal column shape, etc.

[0119] In some embodiments of the present application, Figure 5 As shown, the second sealing member 31 is provided with a groove, and the first sealing member 32 is provided with a convex portion 321 , and the convex portion 321 and the groove are connected in a concave-convex matching manner.

[0120] The convex portion 321 may be formed by partially protruding one end surface of the first sealing member 32. The convex portion 321 may also be formed as follows: Figure 5 The end of one end of the first seal 32 is shown. In the case where the convex portion 321 is formed by partially protruding one end surface of the first seal 32, the convex portion 321 can be arranged at the center position of the end surface of the first seal 32, or at an eccentric position; there can be one convex portion 321, or more than two convex portions 321. The groove can be arranged at the center position of the side surface of the second seal 31, or at an eccentric position of the side surface. The size and shape of the convex portion 321 and the groove match, and can be cylindrical, square columnar or other polygonal columnar shapes, etc.

[0121] For example, Figure 5 As shown, the protrusion 321 is the end of one end of the first seal 32, and the protrusion 321 is inserted into the groove of the second seal 31. The side of the second seal 31 with the groove except the groove is adhered and welded to the outer surface of the shell, which improves the connection firmness between the second seal 31 and the first seal 32 and the welding firmness between the second seal 31 and the shell.

[0122] In some embodiments of the present application, Figures 6 to 10 As shown, the convex portion 321 includes a main body portion 3211 and a snap-fit ​​protrusion 3212 arranged on the outer peripheral side of the main body portion 3211, the groove includes an insertion groove and a snap-fit ​​groove arranged on the inner side wall of the insertion groove, the main body portion 3211 is arranged in the insertion groove, and the snap-fit ​​protrusion 3212 is snap-fitted in the snap-fit ​​groove.

[0123] The plug-in slot can be a cylindrical recessed structure, a square column-shaped recessed structure, or a recessed structure of other shapes. The snap-in slot can be a cylindrical recessed structure, a square column-shaped recessed structure, or an annular recessed structure surrounding the plug-in slot. Accordingly, the main body 3211 can be a cylindrical solid block, a square column-shaped solid block, or an annular solid block surrounding the main body 3211. The snap-in protrusion 3212 can be a cylindrical solid block, a square column-shaped solid block, or an annular solid block surrounding the main body 3211.

[0124] The inner wall of the plug-in slot includes an inner bottom wall facing the slot opening and an inner side wall connected between the slot opening and the inner bottom wall. The snap-in slot is a slot provided on the inner side wall of the plug-in slot. The snap-in slot can be a continuous annular slot surrounding the plug-in slot, or a plurality of slots spaced in sequence surrounding the plug-in slot. The snap-in protrusion 3212 can be a continuous annular block surrounding the main body 3211, or a plurality of blocks spaced in sequence surrounding the main body 3211. The plurality of slots spaced in sequence and the plurality of blocks spaced in sequence are snap-in one-to-one.

[0125] In this way, the main body 3211 and the plug-in groove cooperate with each other to strengthen the radial constraint of the second seal 31 and the first seal 32 on the first seal 32; the snap-in protrusion 3212 and the snap-in groove snap together to strengthen the axial constraint of the second seal 31 and the first seal 32 on the first seal 32, further improving the firmness of the connection between the second seal 31 and the first seal 32, thereby improving the sealing performance.

[0126] In some embodiments of the present application, Figure 6 and Figure 7 As shown, the second sealing member 31 is provided with a groove, which includes a plug-in groove and a snap-fit ​​groove arranged on the inner wall of the plug-in groove. The first sealing member 32 is provided with a convex portion 321, which includes a main body portion 3211 and a snap-fit ​​protrusion 3212 arranged on the outer peripheral side of the main body portion 3211. The main body portion 3211 is arranged in the plug-in groove, and the snap-fit ​​protrusion 3212 is snap-fitted in the snap-fit ​​groove.

[0127] In this way, the plug-in groove of the second seal 31 and the main body 3211 of the first seal 32 cooperate with each other, which can strengthen the radial constraint of the second seal 31 and the first seal 32; the snap-in groove of the second seal 31 and the snap-in protrusion 3212 of the first seal 32 snap-fit ​​with each other, which can strengthen the axial constraint of the second seal 31 and the first seal 32, further improve the firmness of the connection between the second seal 31 and the first seal 32, thereby improving the sealing performance.

[0128] In some embodiments of the present application, Figure 8 As shown, the first sealing member 32 is provided with a groove, which includes a plug-in groove and a snap-fit ​​groove arranged on the inner wall of the plug-in groove. The second sealing member 31 is provided with a convex portion 321, which includes a main body portion 3211 and a snap-fit ​​protrusion 3212 arranged on the outer peripheral side of the main body portion 3211. The main body portion 3211 is arranged in the plug-in groove, and the snap-fit ​​protrusion 3212 is snap-fitted in the snap-fit ​​groove.

[0129] In this way, the plug-in groove of the first seal 32 and the main body 3211 of the second seal 31 cooperate with each other, which can strengthen the radial constraint of the second seal 31 and the first seal 32; the snap-in groove of the first seal 32 and the snap-in protrusion 3212 of the second seal 31 snap into each other, which can strengthen the axial constraint of the second seal 31 and the first seal 32, further improve the firmness of the connection between the second seal 31 and the first seal 32, thereby improving the sealing performance.

[0130] In some embodiments of the present application, Fig. 9 and Fig.10 As shown, there are more than two protrusions 321 and more than two grooves, and the more than two protrusions 321 are matched with the more than two grooves in a one-to-one correspondence.

[0131] The number of protrusions 321 and the number of grooves can be two, three, four, five or six, etc. The specific number can be determined according to actual conditions and is not specifically limited here.

[0132] In this way, the connection strength between the first sealing member 32 and the second sealing member 31 is improved.

[0133] For example, Fig.10 and Fig.11 As shown, there are five protrusions 321, four of which are evenly distributed around a circle center, and the other is located at the center of the circle. Correspondingly, there are five grooves, four of which are evenly distributed around a circle center, and the other is located at the center of the circle.

[0134] For example, Fig.10 and Fig.11 As shown, the first seal 32 is provided with five protrusions 321, one of the five protrusions 321 is located at the center of the end surface of the first seal 32, and the other four are evenly distributed around the center circumference; the second seal 31 is provided with five grooves, one of the five grooves is located at the center of the side of the second seal 31, and the other four grooves are evenly distributed around the center circumference.

[0135] In some embodiments of the present application, there are more than two protrusions 321, each protrusion 321 includes a main body 3211 and a snap-in protrusion 3212 arranged on the outer peripheral side of the main body 3211, and there are more than two grooves, each groove includes a plug-in groove and a snap-in groove arranged on the inner side wall of the plug-in groove, each main body 3211 is arranged in each plug-in groove one by one, and each snap-in protrusion 3212 is snap-in in each snap-in groove one by one.

[0136] In this way, the connection strength between the first sealing member 32 and the second sealing member 31 is improved.

[0137] In some embodiments of the present application, the first sealing member 32 includes a sealing portion 322 and an introduction portion 323, one end of the sealing portion 322 is connected to the introduction portion 323, and the other end is formed with a protrusion 321 or a groove, the sealing portion 322 is interference fit in the injection hole, and the outer peripheral surface of the introduction portion 323 includes a conical introduction surface 3231.

[0138] The sealing portion 322 is interference-fitted in the injection hole to seal the injection hole. The conical introduction surface 3231 of the introduction portion 323 facilitates the first sealing member 32 to be aligned and inserted into the injection hole during the assembly of the sealing nail 3, thereby improving the convenience and efficiency of assembly.

[0139] In some embodiments of the present application, the outer circumferential surface of the sealing portion 322 includes a cylindrical surface 3221 .

[0140] The cylindrical surface 3221 makes the diameter of the sealing portion 322 uniform, thereby improving the uniformity of the interference fit between the sealing portion 322 and the injection hole and improving the sealing performance.

[0141] In some embodiments of the present application, the first seal 32 is injection molded on the second seal 31 , or the first seal 32 and the second seal 31 are interference fit.

[0142] The first seal 32 is injection molded on the second seal 31, which improves the strength of the connection between the two and makes the connection between the two more secure. The convex portion 321 is interference-fitted in the groove, so that the first seal 32 and the second seal 31 are interference-fitted, which improves the connection strength between the first seal 32 and the second seal 31 and makes the connection between the two more secure.

[0143] In some embodiments of the present application, the material of the second sealing member 31 is at least one of aluminum, aluminum alloy and stainless steel.

[0144] The above materials can realize welding between the second sealing member 31 and the housing, and the material cost is low and it is easy to obtain.

[0145] In some embodiments of the present application, the material of the first sealing member 32 is at least one of fluororubber, silicone rubber, polyvinylidene fluoride, polytetrafluoroethylene, polyethylene and polypropylene.

[0146] The above materials can make the first sealing member 32 seal the liquid injection hole, and the material cost is low and easy to obtain.

[0147] Some embodiments of the present application provide a battery 100 including at least one battery cell 20 as described above.

[0148] Since the battery cell 20 described above improves sealing efficiency and has high sealing performance, the battery 100 provided in the embodiment of the present application improves sealing efficiency and has high sealing performance.

[0149] Some embodiments of the present application provide an energy storage device, which includes the above-mentioned battery cell 20 or the above-mentioned battery 100.

[0150] Since the battery cell 20 and the battery 100 described above improve the sealing efficiency and have high sealing performance, the energy storage device provided in the embodiment of the present application improves the sealing efficiency and has high sealing performance.

[0151] Some embodiments of the present application provide an electrical device, which includes the above-mentioned battery cell 20 or the above-mentioned battery 100 for providing electrical energy.

[0152] Since the battery cell 20 and the battery 100 described above improve the sealing efficiency and have high sealing performance, the electrical device provided in the embodiment of the present application improves the sealing efficiency and has high sealing performance.

[0153] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: The shell forms a liquid injection hole; A first sealing member, at least partially located in the injection hole to block the injection hole; A second sealing member, fixedly connected to the housing and covering the first sealing member; Wherein, the first sealing member and the second sealing member are fixedly connected; One of the first sealing member and the second sealing member is provided with a convex portion, and the other is provided with a concave portion, and the convex portion and the concave portion are connected with each other in a concave-convex matching manner.

2. The battery cell according to claim 1, characterized in that: The convex portion includes a main body and a snap-in protrusion arranged on the outer peripheral side of the main body, the concave groove includes an insertion groove and a snap-in groove opened on the inner side wall of the insertion groove, the main body is arranged in the insertion groove, and the snap-in protrusion is snap-in in the snap-in groove.

3. The battery cell according to claim 1, characterized in that: There are more than two protrusions, and there are more than two grooves. The two or more protrusions are matched with the two or more grooves in a one-to-one correspondence.

4. The battery cell according to any one of claims 1 to 3, characterized in that: The first sealing member includes a sealing portion and an introduction portion, one end of the sealing portion is connected to the introduction portion, and the other end is formed with the convex portion or the groove, at least part of the sealing portion is located in the injection hole, and the outer peripheral surface of the introduction portion includes a tapered introduction surface.

5. The battery cell according to claim 4, characterized in that: The outer peripheral surface of the sealing portion includes a cylindrical surface.

6. The battery cell according to any one of claims 1 to 3, characterized in that: The first sealing component is injection molded on the second sealing component, or the first sealing component and the second sealing component are interference fit.

7. The battery cell according to any one of claims 1 to 3, characterized in that: The material of the first sealing member is any one of fluororubber, silicone rubber, polyvinylidene fluoride, polytetrafluoroethylene, polyethylene and polypropylene.

8. The battery cell according to any one of claims 1 to 7, characterized in that: The second sealing member is made of any one of aluminum, aluminum alloy and stainless steel.

9. A sealing nail for a battery cell, characterized in that: include: A first sealing member, used for inserting into the liquid injection hole of the shell of the battery cell to seal the liquid injection hole; A second sealing member, used for being fixedly connected to the housing and covering the first sealing member; Wherein, the first sealing member and the second sealing member are fixedly connected; One of the first sealing member and the second sealing member is provided with a convex portion, and the other is provided with a concave portion, and the convex portion and the concave portion are connected with each other in a concave-convex matching manner.

10. The sealing nail according to claim 9, characterized in that: The convex portion includes a main body and a snap-in protrusion arranged on the outer peripheral side of the main body, the concave groove includes an insertion groove and a snap-in groove opened on the inner side wall of the insertion groove, the main body is arranged in the insertion groove, and the snap-in protrusion is snap-in in the snap-in groove.

11. The sealing nail according to claim 9 or 10, characterized in that: There are more than two protrusions, and there are more than two grooves. The two or more protrusions are matched with the two or more grooves in a one-to-one correspondence.

12. The sealing nail according to claim 9 or 10, characterized in that: The first sealing component is injection molded on the second sealing component, or the first sealing component and the second sealing component are interference fit.

13. A battery, characterized in that: The invention comprises at least one battery cell according to any one of claims 1 to 8.

14. An energy storage device, characterized in that: The energy storage device comprises the battery cell according to any one of claims 1 to 8 or the battery according to claim 13.

15. An electrical device, characterized in that: The electrical device comprises the battery cell according to any one of claims 1 to 8 or the battery according to claim 13 for providing electrical energy.

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