Battery monomer, battery device and electric equipment

Abstract

The embodiment of the utility model provides a battery monomer, a battery device and electric equipment, and belongs to the technical field of battery sealing. The battery monomer comprises a shell which comprises a first wall, and the first wall is provided with a liquid injection hole; the electrode assembly is arranged in the shell; the sealing assembly is used for sealing the liquid injection hole; the sealing assembly comprises a connecting column, a first sealing piece, a second sealing piece and a third sealing piece, the first sealing piece, the second sealing piece and the third sealing piece are connected with the connecting column, and the second sealing piece is located between the first sealing piece and the third sealing piece. The first sealing element is connected to the first end of the liquid injection hole in a sealed mode, the third sealing element is connected to the second end of the liquid injection hole in a sealed mode, and the second sealing element is connected with the hole wall of the liquid injection hole in a sealed mode, so that the liquid injection hole is effectively sealed, and liquid leakage of the liquid injection hole is prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery sealing, in particular to a battery monomer, a battery device and an electric equipment. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] However, during the use of the battery device, the seal at the liquid injection hole may be loosened due to vibration, resulting in liquid leakage, which poses a great risk to the use of the battery device. Therefore, how to improve the use reliability of the battery device is a technical problem that needs to be solved in the battery device technology. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a battery monomer, a battery device and an electric equipment to improve the sealing effect of the liquid injection hole and thereby improve the use reliability of the battery device.

[0005] The present application is achieved by the following technical solutions:

[0006] In a first aspect, the present application provides a battery monomer, comprising:

[0007] a housing comprising a first wall, the first wall being provided with a liquid injection hole;

[0008] an electrode assembly arranged in the housing;

[0009] a sealing assembly for sealing the liquid injection hole;

[0010] The sealing assembly comprises a connecting column, a first sealing member, a second sealing member and a third sealing member, the first sealing member, the second sealing member and the third sealing member are connected with the connecting column, and the second sealing member is located between the first sealing member and the third sealing member.

[0011] The first sealing member is sealingly connected to the first end of the liquid injection hole, the third sealing member is sealingly connected to the second end of the liquid injection hole, and the second sealing member is sealingly connected to the hole wall of the liquid injection hole.

[0012] According to the battery cell of the embodiment of the present application, the first seal is formed through the sealed connection between the first seal and the first end of the liquid injection hole, the second seal is formed through the sealed connection between the third seal and the second end of the liquid injection hole, and the third seal is formed through the sealed connection between the second seal and the hole wall of the liquid injection hole. Thus, the sealing assembly can form three layers of seals at the liquid injection hole, so as to improve the sealing effect of the liquid injection hole, improve the situation that the electrolyte leaks from the liquid injection hole due to the loosening of the seal, and improve the use reliability of the battery device.

[0013] In some embodiments, the hole wall of the liquid injection hole is provided with a sealing groove extending along the circumference of the liquid injection hole, and the second seal is partially embedded in the sealing groove.

[0014] By providing the hole wall of the liquid injection hole with a sealing groove and partially embedding the second seal in the sealing groove, the sealed connection between the second seal and the hole wall of the liquid injection hole is achieved.

[0015] In some embodiments, the second end is the end of the liquid injection hole close to the inside of the shell, and the hole diameter of the liquid injection hole gradually decreases from the first end to the second end.

[0016] Since the hole diameter of the liquid injection hole gradually decreases from the first end to the second end, the liquid injection hole as a whole has a funnel shape, which facilitates the installation of the sealing assembly.

[0017] In some embodiments, the first seal is connected to one end of the connecting column, the second seal is sleeved on the connecting column, and the third seal is connected to the other end of the connecting column.

[0018] By connecting the first seal and the third seal to the two ends of the connecting column respectively and sleeving the second seal on the connecting column, the assembly of each seal with the connecting column is achieved to form the sealing assembly.

[0019] In some embodiments, along the thickness direction of the first wall, the first seal is located outside the liquid injection hole and covers the liquid injection hole, and the third seal is located inside the liquid injection hole and covers the liquid injection hole.

[0020] At this time, the first seal covers the first end of the liquid injection hole, so as to achieve the sealing of the first end of the liquid injection hole by the first seal. At the same time, the third seal covers the second end of the liquid injection hole, so as to achieve the sealing of the second end of the liquid injection hole by the third seal.

[0021] In some embodiments, the central axis of the liquid injection hole is collinear with the central axis of the connecting column.

[0022] At this time, the sealing assembly can be inserted into the liquid injection hole along the central axis of the liquid injection hole. Since the central axis of the liquid injection hole is collinear with the central axis of the connecting column, the sealing effect can be improved, and the situation that the electrolyte leaks from the liquid injection hole due to loose sealing can be improved.

[0023] In some embodiments, an outer surface of the first wall is provided with a receiving groove, and the liquid injection hole penetrates a groove bottom surface of the receiving groove and an inner surface of the first wall.

[0024] The first sealing member is accommodated in the receiving groove.

[0025] By providing the receiving groove on the outer surface of the first wall to accommodate the first sealing member, the appearance of the first wall is smoother, and the installation of the fourth sealing member is facilitated.

[0026] In some embodiments, an outer periphery of the first sealing member abuts against a groove side surface of the receiving groove.

[0027] By abutting the outer periphery of the first sealing member against the groove side surface of the receiving groove, the sealing effect of the first sealing member at the receiving groove is improved.

[0028] In some embodiments, the first wall is further provided with a limiting groove in communication with the receiving groove.

[0029] The sealing assembly further comprises a limiting member connected to the outer periphery of the first sealing member, and the limiting member is limited in the limiting groove.

[0030] By providing the limiting groove on the first wall and connecting the limiting member to the outer periphery of the first sealing member, the possibility of the sealing assembly being separated from the liquid injection hole is reduced, and the sealing effect of the sealing assembly is improved.

[0031] In some embodiments, the limiting groove comprises a plug groove and a rotating groove.

[0032] The plug groove is provided on the outer surface of the first wall and is in communication with the receiving groove. The plug groove has a first side surface in the circumferential direction of the liquid injection hole, and the rotating groove is provided on the first side surface and is in communication with the receiving groove.

[0033] The limiting member can be plugged into the plug groove, and the limiting member can slide into the rotating groove when the first sealing member rotates.

[0034] By plugging the limiting member into the plug groove and then sliding into the rotating groove, the limiting of the limiting member is achieved, and the limiting of the first sealing member and the sealing assembly is achieved, thereby reducing the possibility of the sealing assembly being separated from the liquid injection hole.

[0035] In some embodiments, the rotating groove extends in the circumferential direction of the liquid injection hole.

[0036] By extending the rotating groove along the circumference of the liquid injection hole, the limiting member can slide into the rotating groove after being inserted into the insertion groove, and the limiting of the limiting member can be achieved by rotating the first sealing member.

[0037] In some embodiments, a plurality of limiting members are provided, and the plurality of limiting members are arranged at intervals along the circumference of the first sealing member.

[0038] The limiting groove is provided with a plurality of limiting members, and the plurality of limiting members are arranged one-to-one with the plurality of limiting grooves.

[0039] By providing a plurality of limiting members and a plurality of corresponding limiting grooves, the stable limiting of the first sealing member can be achieved from multiple positions, and the possibility of the first sealing member tilting the sealing assembly is reduced.

[0040] In some embodiments, the battery monomer further comprises an elastic mechanism configured to apply an elastic force in a first direction to the limiting member, the first direction being a direction in which the inner surface of the first wall points to the outer surface of the first wall.

[0041] By providing an elastic mechanism, an elastic force in a first direction is applied to the limiting member, and the limiting member is abutted against the inner wall of the rotating groove, thereby achieving the locking of the limiting member.

[0042] In some embodiments, the rotating groove has a first groove wall and a second groove wall oppositely arranged along the thickness direction of the first wall, the first groove wall is closer to the outer surface of the first wall than the second groove wall, and the second groove wall is provided with a sliding groove in communication with the rotating groove.

[0043] The elastic mechanism comprises an elastic member and a top column, the elastic member is elastically supported between the groove bottom of the sliding groove and the top column, and the top column can abut the limiting member against the first groove wall.

[0044] At this time, the elastic mechanism is composed of an elastic member and a top column, the elastic member can be placed in the sliding groove and elastically supported between the groove bottom of the sliding groove and the top column, and the elastic support of the elastic member to the top column enables the top column to abut the limiting member against the first groove wall, thereby achieving the locking of the limiting member.

[0045] In some embodiments, an inclined surface is provided at one end of the top column away from the elastic member, and the distance between the groove bottom surface of the sliding groove and the inclined surface gradually decreases from the side away from the insertion groove to the side close to the insertion groove.

[0046] The inclined surface is in sliding contact with the limiting member, and the position on the inclined surface farthest from the groove bottom surface of the sliding groove can abut the limiting member against the first groove wall.

[0047] By setting the inclined surface on the top post, the limiting piece can be moved to the side of the top post away from the elastic piece under the sliding cooperation with the inclined surface, and finally abutted on the first groove wall at the position on the inclined surface farthest from the groove bottom surface of the sliding groove, so that the limiting piece is locked.

[0048] In some embodiments, the extending direction of the sliding groove is perpendicular to the extending direction of the rotating groove.

[0049] By making the extending direction of the sliding groove perpendicular to the extending direction of the rotating groove, the elastic mechanism can apply an elastic force to the limiting piece.

[0050] In some embodiments, the battery monomer further comprises a fourth sealing piece welded to the first wall and shielding the accommodating groove and the insertion groove.

[0051] By setting the fourth sealing piece and welding the fourth sealing piece to the first wall, a fourth sealing can be formed, and the accommodating groove and the insertion groove can be shielded.

[0052] In some embodiments, the fourth sealing piece comprises a body and a clamping plate, the body shields the accommodating groove, and the clamping plate is connected to the outer periphery of the body and shields the insertion groove.

[0053] At this time, the fourth sealing piece is composed of the body and the clamping plate, the body can be used to shield the accommodating groove, and the clamping plate can be used to shield the insertion groove.

[0054] In a second aspect, the application provides a battery device comprising the battery monomer in the above embodiments.

[0055] According to the battery device provided by the application, the battery device comprises the battery top cover of any one of the first aspect embodiments, and thus has the technical effects of any one of the above embodiments, which will not be repeated here.

[0056] In a third aspect, the application provides a power consumption equipment comprising the battery monomer in the above embodiments or the battery device in the above embodiments.

[0057] According to the power consumption equipment provided by the application, the power consumption equipment comprises the battery top cover of any one of the first aspect embodiments or the battery device of the second aspect embodiment, and thus has the technical effects of any one of the above embodiments, which will not be repeated here.

[0058] The above description is only a summary of the technical solutions of the application, in order to more clearly understand the technical means of the application, the specific embodiments of the application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0059] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those of ordinary skill in the art, other related drawings can also be obtained without creative effort based on these drawings.

[0060] Figure 1 A structural schematic diagram of a vehicle in some embodiments of the present application;

[0061] Figure 2 A structural schematic diagram of a battery in some embodiments of the present application;

[0062] Figure 3 A structural schematic diagram of a battery cell in some embodiments of the present application;

[0063] Figure 4 A structural schematic diagram of a first wall of a battery cell at a liquid injection hole in some embodiments of the present application;

[0064] Figure 5 A structural schematic diagram of a first wall and a sealing assembly in some embodiments of the present application; Figure 4 A sectional view along A-A in some embodiments of the present application;

[0065] Figure 6 A structural schematic diagram of a first wall and a sealing assembly in some embodiments of the present application; Figure 4

[0066] A structural schematic diagram of a first wall and a sealing assembly in some embodiments of the present application; Figure 7 Figure 4 A structural schematic diagram of a first wall and a sealing assembly in some embodiments of the present application;

[0067] Figure 8 A structural schematic diagram of a first wall and a sealing assembly in some embodiments of the present application; Figure 7 An enlarged schematic diagram of A in some embodiments of the present application.

[0068] The following are the reference signs:

[0069] 1000, a vehicle;

[0070] 100, a battery device; 200, a controller; 300, a motor;

[0071] 10, a box body; 101, a first part; 102, a second part;

[0072] 20, a battery cell;

[0073] ​1, housing; 11, end cap; 11a, electrode terminal; 12, shell; b1, first wall; k1, liquid injection hole; k11, first end; k12, second end; k2, sealing groove; k3, accommodating groove; k4, limiting groove; k41, insertion slot; k411, first side; k42, rotating groove; k421, first groove wall; k422, second groove wall; k5, sliding groove;

[0074] 2, electrode assembly;

[0075] 3, sealing assembly; 31, connecting column; 32, first sealing member; 33, second sealing member; 34, third sealing member; 35, limiting member;

[0076] 4, elastic mechanism; 41, elastic member; 42, top column; 421, inclined surface;

[0077] 5, fourth sealing member; 51, body; 52, clamping plate. DETAILED DESCRIPTION

[0078] The embodiments of the present application will be described in further detail below with reference to the accompanying drawings and examples. The following detailed description and examples are provided as illustrative examples of the principles of the present application and are not intended to limit the scope of the present application, that is, the present application is not limited to the described examples.

[0079] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application; the use herein of terms such as "comprise" and "comprising", and "have" and "having", and any variations thereof, is intended to cover the presence of successively stated integers or features but not to preclude the presence of other integers or features. The use of the terms "first", "second", and the like does not imply a limitation on the number of objects, but rather the order in which objects are described.

[0080] The use herein of terms such as "first", "second" and the like does not imply a limitation on the number of objects, but rather the order in which objects are described.

[0081] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be combined with any of the other embodiments unless explicitly stated otherwise.

[0082] In the description of the present application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0083] The term "and / or" in the present application is only to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0084] The "multiple" appearing in the present application refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0085] At present, from the development of market situation, the application of power battery is more and more extensive. Power battery is not only applied to energy storage power supply system of water power, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0086] The battery device usually includes a plurality of battery monomers, which are connected in series or in series-parallel. Among them, the battery monomer generally has a battery top cover, and the battery top cover is provided with a liquid injection hole, and electrolyte is injected into the inside of the battery monomer through the liquid injection hole. After the liquid injection is completed, the liquid injection hole is usually sealed by laser welding of a sealing aluminum sheet and the battery top cover.

[0087] However, vibration phenomenon may occur during use of the battery device, which may cause welds at the welding position, thereby causing the battery monomer to leak. Therefore, there is a great hidden danger when the battery device is used.

[0088] In order to reduce the occurrence of leakage phenomenon, it is found through research that a structure capable of plugging the liquid injection hole can be added at the liquid injection hole to improve the sealing effect of the liquid injection hole, thereby improving the use reliability of the battery device. Specifically, a sealing structure matched with the liquid injection hole can be provided, and the sealing structure and the liquid injection hole are sealingly connected to achieve plugging and sealing of the liquid injection hole, thereby reducing the risk of electrolyte overflow from the liquid injection hole, thereby improving the use reliability of the battery device.

[0089] Based on the above considerations, in order to solve the problem of liquid leakage caused by the loosening of the seal due to vibration during use of the battery device, the battery monomer designed in the application realizes multi-layer sealing of the liquid injection hole by setting a sealing structure with a first sealing element, a second sealing element and a third sealing element at the liquid injection hole, and sealing the first sealing element to the first end of the liquid injection hole, the third sealing element to the second end of the liquid injection hole, and the second sealing element to the hole wall of the liquid injection hole, thereby effectively improving the sealing effect of the liquid injection hole, reducing the risk of electrolyte flowing out of the liquid injection hole to the outside of the battery monomer, and improving the use reliability of the battery.

[0090] The battery monomer and the battery device disclosed in the embodiments of the application can be used in, but not limited to, electric equipment such as vehicles, ships or aircrafts. The power supply system of the electric equipment can be composed of the battery monomer, the battery device and the like disclosed in the application.

[0091] The technical solutions described in the embodiments of the application are applicable to various electric equipment using battery monomers and battery devices, such as mobile phones, tablets, notebook computers, electric toys, electric tools, electric cars, electric vehicles, ships, spacecraft and the like. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric plane toys, and the spacecraft can include airplanes, rockets, space shuttles and spacecraft.

[0092] The following embodiments take a vehicle 1000 as an example for convenience of description.

[0093] Please refer to Figure 1 , Figure 1 The vehicle 1000 provided by some embodiments of the application is shown in the structural schematic diagram. The vehicle 1000 can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or a range extended car. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power supply of the vehicle 1000, or can be used for the circuit system of the vehicle 1000, for example, for the working power demand of the vehicle 1000 during starting, navigation and running.

[0094] The vehicle 1000 can also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation and running.

[0095] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1000.

[0096] Please refer to Figure 2 , Figure 2 The battery device 100 provided in some embodiments of the present application is shown in an exploded view. The battery device 100 includes a box body 10 and battery cells 20, and the battery cells 20 are accommodated in the box body 10. The box body 10 is used to provide an accommodation space for the battery cells 20, and the box body 10 can adopt various structures.

[0097] In some embodiments, the box body 10 can include a first part 101 and a second part 102, and the first part 101 and the second part 102 are mutually covered. The first part 101 and the second part 102 jointly define an accommodation space for accommodating the battery cells 20. The second part 102 can be a hollow structure with one end open, and the first part 101 can be a plate-shaped structure, which is covered on the open side of the second part 102 to jointly define the accommodation space with the second part 102. The first part 101 and the second part 102 can also be hollow structures with one side open, and the open side of the first part 101 is covered on the open side of the second part 102. Of course, the box body 10 formed by the first part 101 and the second part 102 can have various shapes, such as a cylinder, a cuboid, etc.

[0098] In the battery device 100, the battery cells 20 can be multiple, 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 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 of the multiple battery cells 20 is accommodated in the box body 10. Of course, the battery device 100 can also be that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, which is accommodated in the box body 10. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 20.

[0099] Each battery cell 20 can be a secondary battery, which means that the battery cell can be activated by charging after discharging to continue to be used.

[0100] Please refer to Figure 3 , Figure 3 The battery cell 20 provided in some embodiments of the present application is shown in an exploded structural view. As shown in Figure 3The battery cell 20 includes a housing 1, an electrode assembly 2, and other functional components. The housing 1 includes an end cap 11 and a casing 12 having an opening, and the end cap 11 closes the opening to isolate an internal environment of the battery cell 20 from an external environment.

[0101] The end cap 11 refers to a component that covers the opening of the casing 12 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 11 can be adapted to the shape of the casing 12 to fit the casing 12. Alternatively, the end cap 11 can be made of a material having a certain hardness and strength, such as an aluminum alloy, so that the end cap 11 is less likely to deform when subjected to a pressing impact, and the battery cell 20 can have a higher structural strength and improved reliability. The end cap 11 can be provided with functional components such as an electrode terminal 11a. The electrode terminal 11a can be used to electrically connect with the electrode assembly 2 for outputting or inputting the electric energy of the battery cell 20. In some embodiments, the end cap 11 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 20 when the internal pressure or temperature reaches a threshold value. The material of the end cap 11 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon. In some embodiments, an insulating structure can also be provided on the inner side of the end cap 11, which can be used to isolate the electrically connected components in the casing 12 from the end cap 11 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0102] The casing 12 is a component used to fit the end cap 11 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 2, the electrolyte, and other components. The casing 12 and the end cap 11 can be independent components. The casing 12 can be various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the casing 12 can be determined according to the specific shape and size of the electrode assembly 2. The material of the casing 12 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon.

[0103] Electrode assembly 2 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 12 may contain one or more electrode assemblies 2. Electrode assembly 2 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets to separate them and prevent internal short circuits. The portions of the positive and negative electrode sheets containing active material constitute the main body of the cell assembly, while the portions without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or at opposite ends. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 11a to form a current loop.

[0104] According to some embodiments of this application, refer to Figure 3 Please refer to further details. Figures 4 to 7 , Figure 4 This is a schematic diagram of the structure of the first wall of a battery cell at the injection hole according to some embodiments of this application. Figure 5 for Figure 4 A cross-sectional view along the AA direction. Figure 6 for Figure 4 A schematic diagram of the structure of the first wall and sealing assembly. Figure 7 for Figure 4 A schematic diagram showing the structure after removing the first seal when the fourth seal is not welded to the first wall. The electrode tabs connect to the electrode terminals to form a current loop.

[0105] This application provides a battery cell 20, including a housing 1, an electrode assembly 2, and a sealing assembly 3. The electrode assembly 2 is disposed inside the housing 1. The housing 1 includes a first wall b1, and the first wall b1 is provided with a liquid injection hole k1. The sealing assembly 3 is used to seal the liquid injection hole k1.

[0106] The sealing assembly 3 includes a connecting post 31, a first sealing element 32, a second sealing element 33, and a third sealing element 34. The first sealing element 32, the second sealing element 33, and the third sealing element 34 are respectively connected to the connecting post 31, and the second sealing element 33 is located between the first sealing element 32 and the third sealing element 34.

[0107] The first sealing element 32 is sealed to the first end k11 of the injection hole k1, the third sealing element 34 is sealed to the second end k12 of the injection hole k1, and the second sealing element 33 is sealed to the hole wall of the injection hole k1.

[0108] The shell 1 is a component with a wall structure. The shell 1 includes at least one wall, and the first wall b1 is one of the at least one wall. For example, the first wall b1 can be the end cover 11 shown in some of the foregoing embodiments, or can be one of the shell walls of the shell 12 in some of the foregoing embodiments, as long as it is a wall constituting the shell 1, which is not specifically limited herein. The exterior and the interior of the shell 1 are relative. The interior of the shell 1 is used to form the internal environment of the battery cell 20. Correspondingly, the exterior of the shell 1 is the external environment of the battery cell 20.

[0109] The injection hole k1 on the first wall b1 is a hole that can be used to inject electrolyte. The extension direction of the axis of the injection hole k1 is substantially parallel to the opening direction of the injection hole k1. For example, the injection hole k1 is opened along the thickness direction of the first wall b1, and the extension direction of the axis of the injection hole k1 is parallel to the thickness direction of the first wall b1. Figure 5 For example, the injection hole k1 is opened along the thickness direction of the first wall b1, and the extension direction of the axis of the injection hole k1 is parallel to the thickness direction of the first wall b1.

[0110] The "first sealing member 32 is sealingly connected to the first end k11 of the injection hole k1" means that the first sealing member 32 is tightly attached to the first end k11 of the injection hole k1.

[0111] The "third sealing member 34 is sealingly connected to the second end k12 of the injection hole k1" means that the third sealing member 34 is tightly attached to the second end k12 of the injection hole k1.

[0112] The "second sealing member 33 is sealingly connected to the hole wall of the injection hole k1" means that the outer circumferential side of the second sealing member 33 is tightly attached to the hole wall surface of the injection hole k1.

[0113] The first sealing member 32, the second sealing member 33, and the third sealing member 34 can be gasket structures.

[0114] The second sealing member 33 and the third sealing member 34 can both be rubber materials, and the first sealing member 32 can be a plastic material.

[0115] The first sealing member 32 and the first end k11 of the injection hole k1 are sealingly connected to form a first seal. The third sealing member 34 and the second end k12 of the injection hole k1 are sealingly connected to form a second seal. The second sealing member 33 and the hole wall of the injection hole k1 are sealingly connected to form a third seal. Thus, the sealing assembly 3 can form three layers of seals at the injection hole k1 to improve the sealing effect of the injection hole k1, improve the situation that the electrolyte leaks from the injection hole k1 due to loose sealing, and improve the use reliability of the battery.

[0116] According to some embodiments of the present application, please continue to refer to Figures 5 to 7The hole wall of the liquid injection hole k1 is provided with a sealing groove k2, the sealing groove k2 extends along the circumference of the liquid injection hole k1, and the second sealing element 33 is partially embedded in the sealing groove k2.

[0117] By providing the sealing groove k2 on the hole wall of the liquid injection hole k1 and embedding the second sealing element 33 in the sealing groove k2, the sealing connection between the second sealing element 33 and the hole wall of the liquid injection hole k1 is realized.

[0118] According to some embodiments of the present application, optionally, please continue to refer to Figure 5 The second end k12 is the end of the liquid injection hole k1 close to the inside of the shell 1, and the hole diameter of the liquid injection hole k1 gradually decreases from the first end k11 to the second end k12.

[0119] When the radial section of the liquid injection hole k1 is circular, the hole diameter of the liquid injection hole k1 refers to the diameter of the liquid injection hole k1.

[0120] Since the hole diameter of the liquid injection hole k1 gradually decreases from the first end k11 to the second end k12, the liquid injection hole k1 as a whole is funnel-shaped, which can facilitate the installation of the sealing assembly 3.

[0121] According to some embodiments of the present application, optionally, please continue to refer to Figure 5 and Figure 6 The first sealing element 32 is connected to one end of the connecting column 31, the second sealing element 33 is sleeved on the connecting column 31, and the third sealing element 34 is connected to the other end of the connecting column 31.

[0122] By connecting the first sealing element 32 and the third sealing element 34 to the two ends of the connecting column 31 respectively, and sleeving the second sealing element 33 on the connecting column 31, the assembly between each sealing element and the connecting column 31 is realized to form the sealing assembly 3.

[0123] According to some embodiments of the present application, optionally, please continue to refer to Figure 5 In the thickness direction of the first wall b1, the first sealing element 32 is located outside the liquid injection hole k1 and covers the liquid injection hole k1, and the third sealing element 34 is located inside the liquid injection hole k1 and covers the liquid injection hole k1.

[0124] The first sealing element 32, the second sealing element 33 and the third sealing element 34 can all be circular gaskets.

[0125] The outer diameter of the first sealing element 32 is greater than the hole diameter of the first end k11 of the liquid injection hole k1, so as to cover the first end k11 of the liquid injection hole k1.

[0126] The outer diameter of the third sealing element 34 is greater than the hole diameter of the second end k12 of the liquid injection hole k1, so as to cover the second end k12 of the liquid injection hole k1.

[0127] At this time, the first sealing member 32 covers the first end k11 of the liquid injection hole k1, thereby realizing the sealing of the first end k11 of the liquid injection hole k1 by the first sealing member 32. At the same time, the third sealing member 34 covers the second end k12 of the liquid injection hole k1, thereby realizing the sealing of the second end k12 of the liquid injection hole k1 by the third sealing member 34.

[0128] According to some embodiments of the present application, please continue to refer to Figures 4 to 8 , the central axis of the liquid injection hole k1 is collinear with the central axis of the connecting column 31.

[0129] At this time, the sealing assembly 3 can be inserted into the liquid injection hole k1 along the direction of the central axis of the liquid injection hole k1. Since the central axis of the liquid injection hole k1 is collinear with the central axis of the connecting column 31, the situation that the electrolyte leaks from the liquid injection hole k1 due to the loosening of the seal is improved.

[0130] According to some embodiments of the present application, please continue to refer to Figures 5 to 8 , the outer surface of the first wall b1 is provided with a receiving groove k3, and the liquid injection hole k1 penetrates the groove bottom surface of the receiving groove k3 and the inner surface of the first wall b1.

[0131] The first sealing member 32 is accommodated in the receiving groove k3.

[0132] By providing the receiving groove k3 on the outer surface of the first wall b1 to accommodate the first sealing member 32, the appearance of the first wall b1 is more flat, and the installation of the fourth sealing member is also provided with a space.

[0133] According to some embodiments of the present application, please continue to refer to Figures 5 to 8 , the outer periphery of the first sealing member 32 abuts against the groove side surface of the receiving groove k3.

[0134] The "outer periphery of the first sealing member 32 abuts against the groove side surface of the receiving groove k3" means that the outer periphery of the first sealing member 32 is tightly combined with the groove side surface of the receiving groove k3.

[0135] By abutting the outer periphery of the first sealing member 32 against the groove side surface of the receiving groove k3, the sealing effect of the first sealing member 32 at the receiving groove k3 is improved.

[0136] According to some embodiments of the present application, please continue to refer to Figures 5 to 8 , the first wall b1 is further provided with a limiting groove k4 in communication with the receiving groove k3.

[0137] The sealing assembly 3 further comprises a limiting member 35 connected to the outer periphery of the first sealing member 32, and the limiting member 35 is limited in the limiting groove k4.

[0138] By setting the limiting groove k4 on the first wall b1 and connecting the limiting member 35 to the outer periphery of the first sealing member 32, the possibility of the sealing assembly 3 being separated from the liquid injection hole k1 can be reduced, and the sealing effect of the sealing assembly 3 can be improved.

[0139] According to some embodiments of the present application, please continue to refer to Figures 6 to 8 , the limiting groove k4 includes a slot k41 and a turning groove k42.

[0140] The slot k41 is arranged on the outer surface of the first wall b1 and communicates with the accommodating groove k3. The slot k41 has a first side surface k411 in the circumferential direction of the liquid injection hole k1, and the turning groove k42 is arranged on the first side surface k411 and communicates with the accommodating groove k3.

[0141] The limiting member 35 can be inserted into the slot k41, and the limiting member 35 can slide into the turning groove k42 when the first sealing member 32 rotates.

[0142] After the limiting member 35 is inserted into the slot k41, it can slide into the turning groove k42 to limit the limiting member 35, and then limit the first sealing member 32 and the sealing assembly 3, thereby reducing the possibility of the sealing assembly 3 being separated from the liquid injection hole k1.

[0143] According to some embodiments of the present application, please continue to refer to Figure 6 and Figure 7 , the turning groove k42 extends in the circumferential direction of the liquid injection hole k1 to form an arc-shaped turning groove.

[0144] By extending the turning groove k42 in the circumferential direction of the liquid injection hole k1, the limiting member 35 can slide into the turning groove k42 after being inserted into the slot k41, thereby limiting the limiting member 35.

[0145] According to some embodiments of the present application, please continue to refer to Figure 6 , the limiting member 35 is provided in plurality, and the plurality of limiting members 35 are arranged at intervals in the circumferential direction of the first sealing member 32.

[0146] The limiting groove k4 is provided in plurality, and the plurality of limiting members 35 are arranged one by one corresponding to the plurality of limiting grooves k4.

[0147] A plurality of limiting members 35 can be arranged on the circumferential edge of the first sealing member 32, and the plurality of limiting members 35 are isolated and independently arranged, i.e., arranged at intervals.

[0148] For example, the limiting member 35 can be provided in two, and the two limiting members 35 are symmetrically arranged about the central axis of the first sealing member 32. In other embodiments, the limiting member can also be provided in three or five, etc.

[0149] The plurality of limiting members 35 and the plurality of limiting grooves k4 are arranged to stably limit the first sealing member 32 from multiple positions, thereby reducing the possibility of the sealing assembly 3 being tilted by the first sealing member 32.

[0150] According to some embodiments of the present application, please continue to refer to Figure 7 and Figure 8 The battery monomer 20 further comprises an elastic mechanism 4 configured to apply an elastic force in a first direction to the limiting member 35, the first direction being a direction in which the inner surface of the first wall b1 points to the outer surface of the first wall b1.

[0151] In the above scheme, the elastic mechanism 4 is arranged to apply an elastic force in the first direction to the limiting member 35, so as to abut the limiting member 35 against the inner wall of the rotating groove k42, thereby locking the limiting member 35, and also allowing the limiting member 35 to slightly move the first sealing member 32, the connecting column 31, the second sealing member 33 and the third sealing member 34 in the direction of the outer surface of the first wall b1, thereby improving the sealing effect at the second sealing member 33 and the third sealing member 34.

[0152] According to some embodiments of the present application, please continue to refer to Figure 7 and Figure 8 The rotating groove k42 has a first groove wall k421 and a second groove wall k422 arranged opposite along the thickness direction of the first wall b1, the first groove wall k421 is closer to the outer surface of the first wall b1 than the second groove wall k422, and the second groove wall k422 is provided with a sliding groove k5 communicating with the rotating groove k42.

[0153] The elastic mechanism 4 comprises an elastic member 41 and a top column 42, the elastic member 41 is elastically supported between the groove bottom of the sliding groove k5 and the top column 42, and the top column 42 can abut the limiting member 35 against the first groove wall k421.

[0154] The elastic member 41 can be a component with elastic structure, such as spring, rubber, etc.

[0155] At this time, the elastic mechanism 4 is composed of the elastic member 41 and the top column 42, the elastic member 41 can be placed in the sliding groove k5 and elastically supported between the groove bottom of the sliding groove k5 and the top column 42, and the elastic support of the elastic member 41 to the top column 42 allows the top column 42 to abut the limiting member 35 against the first groove wall k421, thereby locking the limiting member 35.

[0156] According to some embodiments of the present application, please continue to refer to Figure 8The end of the top column 42 away from the elastic member 41 is provided with an inclined surface 421, and the distance between the groove bottom surface of the sliding groove k5 and the inclined surface 421 gradually decreases from the side away from the insertion groove k41 to the side close to the insertion groove k41. At this time, the side of the inclined surface 421 away from the insertion groove k41 is higher, and the side of the inclined surface 421 close to the insertion groove k41 is lower.

[0157] The inclined surface 421 is in sliding contact with the limiting member 35, and the position on the inclined surface 421 farthest from the groove bottom surface of the sliding groove k5 can abut the limiting member 35 against the first groove wall k421.

[0158] By providing the inclined surface 421 on the top column 42, the limiting member 35 can move to the side of the top column 42 away from the elastic member 41 under the sliding cooperation of the inclined surface 421, and finally abut the limiting member 35 against the first groove wall k421 through the position on the inclined surface 421 farthest from the groove bottom surface of the sliding groove k5, to realize the locking of the limiting member 35.

[0159] According to some embodiments of the present application, optionally, please continue to refer to Figures 4 to 8 The extension direction of the sliding groove k5 is perpendicular to the extension direction of the rotating groove k42.

[0160] By making the extension direction of the sliding groove k5 perpendicular to the extension direction of the rotating groove k42, the elastic mechanism 4 can apply an elastic force to the limiting member 35.

[0161] According to some embodiments of the present application, optionally, please continue to refer to Figures 4 to 7 The battery monomer 20 further comprises a fourth sealing member 5, and the fourth sealing member 5 is welded to the first wall b1 and shields the accommodation groove k3 and the insertion groove k41.

[0162] By providing the fourth sealing member 5 and welding the fourth sealing member 5 to the first wall b1, a fourth sealing can be formed, and the accommodation groove k3 and the insertion groove k41 can be shielded.

[0163] According to some embodiments of the present application, optionally, please continue to refer to Figures 4 to 7 The fourth sealing member 5 comprises a body 51 and a clamping plate 52, the body 51 shields the accommodation groove k3, and the clamping plate 52 is connected to the outer periphery of the body 51 and shields the insertion groove k41.

[0164] The body 51 can be a sealed aluminum sheet.

[0165] The body 51 and the clamping plate 52 can be an integral molding structure.

[0166] At this time, the fourth sealing member 5 is composed of the body 51 and the clamping plate 52, the body 51 can be used to shield the accommodation groove k3, and the clamping plate 52 can be used to shield the insertion groove k41.

[0167] According to some embodiments of the present application, the present application further provides a battery device comprising the battery cell according to any one of the above solutions.

[0168] According to some embodiments of the present application, the present application further provides a battery device comprising the battery cell according to any one of the above solutions.

[0169] The battery device can be a device or system to which the battery is applied.

[0170] According to some embodiments of the present application, referring to Figures 4 to 8 , the present application provides a battery cell 20 comprising a first wall b1, a sealing assembly 3, an elastic mechanism 4 and a fourth sealing member 5.

[0171] The first wall b1 is provided with a liquid injection hole k1, a sealing groove k2, a receiving groove k3, a limiting groove k4 and a sliding groove k5. The sealing groove k2 is arranged on the hole wall of the liquid injection hole k1. The first end of the liquid injection hole k1 is in communication with the groove bottom of the receiving groove k3. The limiting groove k4 comprises a plug-in groove k41 and a rotating groove k42, which are in communication with the receiving groove k3. The rotating groove k42 is in communication between the plug-in groove k41 and the sliding groove k5.

[0172] The sealing assembly 3 comprises a connecting column 31, a first sealing member 32, a second sealing member 33, a third sealing member 34 and a limiting member 35. The third sealing member 34 seals the second end k12 of the liquid injection hole k1, thereby realizing the first sealing of the liquid injection hole k1. The second sealing member 33 fills the sealing groove k2, thereby realizing the second sealing of the liquid injection hole k1. The first sealing member 32 fills and covers the first end k11 of the liquid injection hole k1, thereby completing the three sealing processes of the liquid injection hole k1. The limiting member 35 is limited to rotate into the rotating groove k42 along with the first sealing member 32.

[0173] The elastic mechanism 4 comprises an elastic member 41 and a top column 42. The elastic member 41 is elastically supported between the groove bottom of the sliding groove k5 and the top column 42. The top column 42 abuts against the first groove wall k421 of the rotating groove k42 under the elastic action of the elastic member 41.

[0174] The fourth sealing member 5 comprises a body 51 and a clamping plate 52. The fourth sealing member 5 is welded to the first wall b1. The receiving groove k3 is shielded by the body 51, and the plug-in groove k41 is shielded by the clamping plate 52.

[0175] The installation process of the battery cell 20 provided by the embodiments of the present application is exemplarily described below in combination with the situations illustrated in the above embodiments, but is not limited thereto.

[0176] Please refer to Figures 4 to 8, first align the sealing assembly 3 with the injection hole k1 on the first wall b1 of the battery, and then insert the sealing assembly 3 into the injection hole k1. During the insertion, the third sealing member 34 drives the connecting column 31, the first sealing member 32 and the second sealing member 33 to move downward, and when the third sealing member 34 moves to the bottom end of the injection hole k1, it continues to move downward, at this time, the third sealing member 34 will be extruded by the bottom end of the inner wall of the injection hole k1, and then the third sealing member 34 will deform until the third sealing member 34 is reduced to pass through the injection hole k1, and then the third sealing member 34 will rebound to its original shape, thereby preliminarily sealing and blocking the second end k12 of the injection hole k1.

[0177] When the third sealing member 34 passes through the injection hole k1, the second sealing member 33 will be extruded by the inner wall of the injection hole k1 during the movement, so that the second sealing member 33 deforms until the second sealing member 33 moves to the position of the sealing groove k2, and then the second sealing member 33 rebounds to its original shape, thereby filling the inner wall of the sealing groove k2 and forming a secondary sealing effect on the injection hole k1. At this time, the limiting member 35 will be inserted into the insertion slot k41 during the movement, and the first sealing member 32 will fill and cover the first end k11 of the injection hole k1, thereby completing the three times sealing treatment of the injection hole k1. Then, rotate the first sealing member 32 to drive the limiting member 35 to rotate and engage into the rotation slot k42, thereby completing the sealing operation of the injection hole k1.

[0178] During the rotation of the limiting member 35 to the rotation slot k42, the limiting member 35 will contact the top column 42, and then extrude the inclined surface 421 of the top column 42. The extruded top column 42 will move downward, and during the downward movement, it will extrude and compress the elastic member 41. Then, when the limiting member 35 and the first sealing member 32 are rotated, the elastic member 41 will push the top column 42 to move upward, thereby pushing the first sealing member 32 to move upward, so that the top end of the second sealing member 33 and the third sealing member 34 tightly abut against the inner wall top end of the sealing groove k2 and the second end k12 of the injection hole k1, thereby further improving the sealing effect of the injection hole k1 and ensuring the reliability during use. Then, place or partially insert the body 51 into the top end of the injection hole k1, and keep the clamping plate 52 placed or partially inserted into the insertion slot k41, and then use laser to weld the body 51, the clamping plate 52 and the outer side of the first wall b1 and the inner wall of the insertion slot k41.

[0179] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery monomer comprises: a shell comprising a first wall, the first wall being provided with a liquid injection hole; an electrode assembly arranged in the shell; a sealing assembly for sealing the liquid injection hole; wherein the sealing assembly comprises a connecting column, a first sealing member, a second sealing member and a third sealing member, the first sealing member, the second sealing member and the third sealing member are connected with the connecting column respectively, and the second sealing member is located between the first sealing member and the third sealing member; the first sealing member is sealingly connected to a first end of the liquid injection hole, the third sealing member is sealingly connected to a second end of the liquid injection hole, and the second sealing member is sealingly connected with a hole wall of the liquid injection hole.

2. The battery cell of claim 1, wherein, The hole wall of the liquid injection hole is provided with a sealing groove, the sealing groove extends along the circumference of the liquid injection hole, and the second sealing member is partially embedded in the sealing groove.

3. The battery cell of claim 1, wherein, The second end is an end of the liquid injection hole close to the inside of the shell, and the hole diameter of the liquid injection hole gradually decreases from the first end to the second end.

4. The battery cell of claim 3, wherein, The first sealing member is connected to one end of the connecting column, the second sealing member is sleeved on the connecting column, and the third sealing member is connected to the other end of the connecting column.

5. The battery cell of claim 4, wherein, Along the thickness direction of the first wall, the first sealing member is located outside the liquid injection hole and covers the liquid injection hole, and the third sealing member is located inside the liquid injection hole and covers the liquid injection hole.

6. The battery cell of claim 1, wherein, The central axis of the liquid injection hole is collinear with the central axis of the connecting column.

7. The battery cell of any one of claims 1-6, wherein, The outer surface of the first wall is provided with a receiving groove, and the liquid injection hole penetrates the groove bottom surface of the receiving groove and the inner surface of the first wall; The first sealing member is accommodated in the receiving groove.

8. The battery cell of claim 7, wherein, The outer periphery of the first sealing member abuts against the groove side surface of the receiving groove.

9. The battery cell of claim 8, wherein, The first wall is also provided with a limiting groove in communication with the receiving groove; The sealing assembly further comprises a limiting member connected to the outer periphery of the first sealing member, and the limiting member is limited in the limiting groove.

10. The battery cell of claim 9, wherein, The limiting groove comprises a plug-in groove and a rotating groove; The plug-in groove is arranged on the outer surface of the first wall and is in communication with the receiving groove; the plug-in groove has a first side surface in the circumferential direction of the liquid injection hole, and the rotating groove is arranged on the first side surface and is in communication with the receiving groove; The limiting member can be plugged into the plug-in groove, and the limiting member can slide into the rotating groove when the first sealing member rotates.

11. The battery cell of claim 10, wherein, The rotating groove extends along the circumference of the liquid injection hole.

12. The battery cell of claim 9, wherein, The limiting member is provided in plurality, and the plurality of limiting members are arranged in interval along the circumference of the first sealing member; The limiting groove is provided in plurality, and the plurality of limiting members are arranged in one-to-one correspondence with the plurality of limiting grooves.

13. The battery cell of claim 10, wherein, The battery monomer further comprises an elastic mechanism configured to apply an elastic force in a first direction to the limiting member, the first direction being a direction in which the inner surface of the first wall points to the outer surface of the first wall.

14. The battery cell of claim 13, wherein, The rotating groove has a first groove wall and a second groove wall oppositely arranged along the thickness direction of the first wall, the first groove wall is closer to the outer surface of the first wall than the second groove wall, and the second groove wall is provided with a sliding groove in communication with the rotating groove; The elastic mechanism comprises an elastic member and a top post, the elastic member is elastically supported between the groove bottom of the sliding groove and the top post, and the top post can abut the limiting member against the first groove wall.

15. The battery cell of claim 14, wherein, An end of the top post away from the elastic member is provided with an inclined surface, and a distance between the inclined surface and the groove bottom surface of the sliding groove gradually decreases from a side away from the insertion slot to a side close to the insertion slot. The inclined surface is in sliding contact with the limiting member, and a position on the inclined surface farthest from the groove bottom surface of the sliding groove can abut the limiting member against the first groove wall.

16. The battery cell of claim 14, wherein, The extension direction of the sliding groove is perpendicular to the extension direction of the rotating groove.

17. The battery cell of claim 10, wherein, The battery monomer further comprises a fourth sealing member, which is welded to the first wall and covers the accommodation groove and the insertion slot.

18. The battery cell of claim 17, wherein, The fourth sealing member comprises a body and a clamping plate, the body covers the accommodation groove, and the clamping plate is connected to the outer periphery of the body and covers the insertion slot.

19. A battery device characterized by comprising: A battery device comprising the battery monomer according to any one of claims 1-18.

20. An electrical device, comprising: A battery device comprising the battery monomer according to any one of claims 1-18, or the battery device according to claim 19.

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