Battery monomer, battery device and electric equipment

Abstract

The utility model relates to the technical field of battery production, in particular to a battery monomer, a battery device and electric equipment. The battery monomer comprises a shell, an electrode assembly and a top cover assembly, and the electrode assembly is arranged in the accommodating cavity; the top cover assembly comprises a top cover body and a sealing structure, the top cover body covers the opening and seals the containing cavity, a liquid injection hole is formed in the top cover body, and a cavity is formed in the top cover body; the sealing structure comprises a first sealing assembly and a second sealing assembly, the first sealing assembly has a first state for sealing the liquid injection hole and a second state for opening the liquid injection hole, the second sealing assembly is arranged on the side, facing the containing cavity, of the first sealing assembly, and the second sealing assembly is arranged in the liquid injection hole and can move in the axial direction of the liquid injection hole. And the second sealing assembly divides the liquid injection hole into a first cavity and a second cavity, the second cavity communicates with the containing cavity, and when the first sealing assembly is in the second state, the probability that the electrolyte in the containing cavity leaks or external pollutants enter the containing cavity is reduced.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a battery cell, a battery device, and an electrical appliance. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] With the increasing maturity of new energy technologies, new energy vehicles and other electrical equipment are gradually entering the public eye. The core technology of new energy vehicles lies in the battery device, and the safety and stability of the battery device directly determine the performance of the entire vehicle.

[0004] The battery device includes individual battery cells, which in turn include a housing, electrode assemblies, and a top cover assembly. The electrode assemblies are housed within the housing cavity. During the process of venting and / or replenishing electrolyte in the battery cells, electrolyte leakage or the entry of external contaminants can easily occur. Utility Model Content

[0005] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which solves the problem that electrolyte leakage or external contaminants may easily occur during the process of venting and / or replenishing the battery cell in the prior art.

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

[0007] The housing has an opening, and the housing has a receiving cavity communicating with the opening;

[0008] Electrode assembly, the electrode assembly being disposed within the receiving cavity; and

[0009] A top cover assembly includes a top cover body and a sealing structure. The top cover body covers the opening and closes the receiving cavity. The top cover body has an injection hole and an internal cavity. The sealing structure includes a first sealing component and a second sealing component. The first sealing component has a first state of sealing the injection hole and a second state of opening the injection hole. The second sealing component is located on the side of the first sealing component facing the receiving cavity. The second sealing component is located inside the injection hole and can move along the axial direction of the injection hole. The second sealing component divides the injection hole into a first cavity and a second cavity that are not interconnected. The second cavity is connected to the receiving cavity. When the first sealing component is in the second state, the second cavity and the empty cavity are not interconnected, and the first cavity and the empty cavity are connected. When the first sealing component is in the first state, the second sealing component has a third state in which the second cavity and the empty cavity are connected.

[0010] The battery cell in this application embodiment comprises a housing, an electrode assembly, and a top cover assembly. The top cover assembly includes a top cover body and a sealing structure. The top cover body covers the opening and closes the accommodating cavity. The top cover body has an injection hole and an internal cavity. The sealing structure includes a first sealing component and a second sealing component. The first sealing component has a first state of sealing the injection hole and a second state of opening the injection hole. The second sealing component is located on the side of the first sealing component facing the accommodating cavity. The second sealing component is located within the injection hole and is movable along the axial direction of the injection hole. The sealing assembly divides the injection port into two non-communicating chambers, the first chamber and the empty chamber. The second chamber is connected to the receiving cavity. Specifically, when the first sealing assembly is in its second state, the second chamber and the empty cavity are not connected, while the first chamber and the empty cavity are connected. In its third state, when the first sealing assembly is in its first state and electrolyte is injected into the first chamber, the second sealing assembly can seal the receiving cavity, reducing the likelihood of electrolyte leakage or external contaminants entering the receiving cavity. Furthermore, when the first sealing assembly is in its first state, the second sealing assembly in its third state allows gas in the second chamber to be vented into the empty cavity, and when the first sealing assembly is in its second state, gas in the empty cavity is vented out through the first chamber, thus achieving the venting process of the battery cell.

[0011] In some embodiments of this application, the second sealing assembly includes a pressing member and a sealing member connected to each other. The outer wall surface of the sealing member abuts against the inner wall surface of the injection hole and divides the injection hole into a first cavity and a second cavity that are sealed and isolated from each other. The side of the sealing member facing the first sealing assembly is provided with a pressing member.

[0012] In the embodiments of this application, the second sealing assembly includes a pressing member and a sealing member connected to each other. The outer wall surface of the sealing member abuts against the inner wall surface of the injection hole and divides the injection hole into a first cavity and a second cavity that are sealed and isolated from each other. The side of the sealing member facing the first sealing assembly is provided with a pressing member. By pressing the pressing member, the sealing member can be moved downward along the axial direction of the injection hole, so that the first cavity communicates with the cavity, which facilitates the electrolyte to flow from the first cavity into the cavity.

[0013] In some embodiments of this application, the battery cell further includes a limiting member disposed in the first cavity and connected to the wall of the first cavity. The limiting member is disposed between the first sealing assembly and the sealing member to limit the position of the sealing member moving axially along the injection hole.

[0014] The embodiments of this application provide a limiting member, which is located in the first cavity and connected to the wall of the first cavity. The limiting member is located between the first sealing assembly and the sealing member to limit the position of the sealing member moving axially along the injection hole. This limits the position of the sealing member moving upward along the injection hole, reducing the probability of the pressing member contacting the first sealing assembly.

[0015] In some embodiments of this application, the limiting member is provided with a clearance hole, which is correspondingly provided with the pressing member so that when the second sealing component is in the third state, the pressing member can be inserted into the clearance hole.

[0016] The embodiments of this application provide clearance holes on the limiting member, and the clearance holes are correspondingly provided with the pressing member, so that when the second sealing component is in the third state, the pressing member can be inserted into the clearance hole, which allows the second sealing component to move upward, and the second sealing component can move upward or downward within a certain range.

[0017] In some embodiments of this application, the number of pressing elements is at least two, and the at least two pressing elements are spaced apart around the axis of the injection hole; the number of clearance holes is the same as the number of pressing elements, and each clearance hole corresponds to one pressing element.

[0018] The embodiments of this application set the number of pressing parts to at least two, and the at least two pressing parts are arranged at intervals around the axis of the injection hole; the number of clearance holes is the same as the number of pressing parts, and each clearance hole is set to correspond to one pressing part. Thus, according to the number and position of the pressing parts, clearance holes corresponding to the pressing parts can be set to reduce the probability of the pressing parts being blocked.

[0019] In some embodiments of this application, the wall of the first cavity is provided with a groove, and the limiting member is embedded in the groove.

[0020] In the embodiments of this application, a groove is provided on the wall of the first cavity, and the limiting member is embedded in the groove, so that the limiting member can be stably disposed in the groove, thereby achieving stable installation of the limiting member.

[0021] In some embodiments of this application, the battery cell further includes an elastic element, the two ends of which abut against a limiting element and a sealing element, respectively.

[0022] The embodiments of this application provide an elastic element, with its two ends abutting against the limiting element and the sealing element respectively. The compression of the elastic element between the sealing element and the limiting element provides a force to the sealing element, making the movement of the sealing element smoother and more stable.

[0023] In some embodiments of this application, the axis of the elastic element is aligned with the axis of the injection hole.

[0024] In the embodiments of this application, by aligning the axis of the elastic element with the axis of the injection hole, the elastic element can be positioned at the center of the injection hole, resulting in a more balanced force exerted by the elastic element on the seal and reducing the likelihood of the seal tilting.

[0025] In some embodiments of this application, the size of the cavity along the axial direction of the injection hole is smaller than the size of the seal.

[0026] The embodiments of this application, by making the size of the cavity smaller than the size of the seal along the axial direction of the injection hole, enable the seal to completely seal the cavity, facilitating communication between the first cavity and the cavity or between the second cavity and the cavity, and preventing the cavity from being simultaneously connected to the first cavity and the second cavity.

[0027] In some embodiments of this application, the seal is a non-metallic component.

[0028] The embodiments of this application reduce the likelihood of the seal being corroded by the electrolyte by setting the seal to a non-metallic part.

[0029] A second aspect of the embodiments of this application provides a battery device, the battery device comprising:

[0030] The battery cells mentioned in the above embodiments; and

[0031] The battery cells are housed within the enclosure.

[0032] A third aspect of the embodiments of this application provides an electrical device that includes the battery device mentioned in the above embodiments, the battery device being used to supply power to the electrical device.

[0033] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0034] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0035] Figure 1 This is a schematic diagram of the structure of an electrical device provided in some embodiments of this application;

[0036] Figure 2This application provides a schematic diagram of the structure of a battery device according to some embodiments;

[0037] Figure 3 An exploded structural diagram of a battery cell provided for some embodiments of this application;

[0038] Figure 4 for Figure 3 Another structural schematic diagram of the top cover assembly of the battery cell shown;

[0039] Figure 5 for Figure 4 The top cover assembly of the battery cell shown is a structural schematic diagram from another perspective;

[0040] Figure 6 for Figure 5 A schematic cross-sectional view of the top cover assembly of the battery cell shown along section AA.

[0041] Figure 7 for Figure 4 A partial structural diagram of the top cover assembly of the battery cell shown (the top cover body is not shown).

[0042] Figure 8 for Figure 6 A partial structural diagram of the top cover component of the battery cell shown (the limiting component is not shown).

[0043] The attached figures are labeled as follows:

[0044] 1000, Vehicle; 100, Battery unit; 200, Controller; 300, Motor;

[0045] 10. Battery cell; 11. Electrode assembly; 111. Main body; 112. Terminal tab; 12. Adapter; 13. Top cover assembly; 131. Electrode terminal; 132. Top cover body; 1321. Liquid injection hole; 13211. First cavity; 13212. Second cavity; 13213. Groove; 1322. Cavity; 133. Sealing structure; 1331. First sealing assembly; 1332. Second sealing assembly; 13321. Pressing element; 13322. Sealing element; 134. Limiting element; 1341. Clearance hole; 135. Elastic element; 14. Housing; 141. Opening; 142. Receiving cavity; 15. Insulating element;

[0046] 20. Box; 21. First box; 22. Second box; 23. Storage space;

[0047] XX, the length direction of the battery cell;

[0048] ZZ, height direction of individual battery cells:

[0049] H1, the axial dimension of the cavity along the injection hole;

[0050] H2, the axial dimension of the seal along the injection hole. Detailed Implementation

[0051] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0053] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0054] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0055] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0056] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0057] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0058] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0059] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0060] The battery devices described in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft. Such electrical equipment can be composed of battery cells and battery devices as described in this application.

[0061] In this application embodiment, the electrical devices using battery devices as power sources can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0062] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all batteries including housings and electrical equipment using batteries.

[0063] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0064] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0065] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0066] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0067] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0068] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0069] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0070] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0071] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0072] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. Current collectors without the positive active material layer protrude beyond those with the coating. These uncoated current collectors are stacked together to form the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. Current collectors without the negative active material layer protrude beyond those with the coating. These uncoated current collectors are stacked together to form the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0073] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0074] The battery device includes individual battery cells, which in turn include a housing, electrode assemblies, and a top cover assembly. The electrode assemblies are housed within the housing cavity. During the process of venting and / or replenishing electrolyte in the battery cells, electrolyte leakage or the entry of external contaminants can easily occur.

[0075] To address this problem, this application proposes a battery cell comprising a housing, an electrode assembly, and a top cover assembly. The housing has an opening and a cavity communicating with the opening. The electrode assembly is disposed within the cavity. The top cover assembly includes a top cover body and a sealing structure. The top cover body covers the opening and closes the cavity. The top cover body has an injection hole and an internal cavity. The sealing structure includes a first sealing component and a second sealing component. The first sealing component has a first state of sealing the injection hole and a second state of opening the injection hole. The second sealing component is disposed on the side of the first sealing component facing the cavity. The second sealing component is disposed within the injection hole and is movable along the axial direction of the injection hole. The second sealing component divides the injection hole into a first cavity and a second cavity that are not interconnected. The second cavity is connected to the cavity. When the first sealing component is in the second state, the second cavity and the cavity are not interconnected, and the first cavity and the cavity are interconnected. When the first sealing component is in the first state, the second sealing component has a third state in which the second cavity is connected to the cavity.

[0076] The battery cells in the embodiments of this application can be used in electrical equipment such as vehicles, or can be installed in electrical equipment where battery cells need to be installed in advance.

[0077] The structures in the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0078] Combination Figure 1 As shown, vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of vehicle 1000. The battery device 100 can be used to power vehicle 1000; for example, the battery device 100 can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

[0079] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0080] like Figure 2 As shown, an embodiment of this application also provides a battery device 100, including a battery housing 20 and a battery cell 10. The battery housing 20 has a receiving space 23, and the battery cell 10 is installed in the receiving space 23.

[0081] In some embodiments, such as Figure 2 As shown, the battery housing 20 may include a first housing 21 and a second housing 22, which are mutually capped, and together define a receiving space 23 for accommodating the battery cell 10. Both the first housing 21 and the second housing 22 can be hollow structures with one end open, with the second housing 22 capping the open end of the first housing 21, so that the first housing 21 and the second housing 22 jointly define the receiving space; alternatively, the second housing 22 can be a plate-like structure, and the first housing 21 can be a hollow structure with one side open, with the open side of the second housing 22 capping the open side of the first housing 21. Of course, the battery housing 20 formed by the first housing 21 and the second housing 22 can be of various shapes, such as a cylinder or a cuboid.

[0082] The battery cell 10 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 10 can be cylindrical, flat, cuboid, or other shapes.

[0083] like Figure 3 As shown, an embodiment of this application also proposes a battery cell 10, which includes an electrode assembly 11. The electrode assembly 11 includes a tab 112 and an adapter 12, wherein the tab 112 is connected to the adapter 12.

[0084] It is understood that the battery cell 10 also includes a housing 14, an insulating component 15, and a top cover assembly 13, etc. The housing 14 has an opening 141 and a receiving cavity 142 communicating with the opening 141 inside the housing 14. The electrode assembly 11 is located in the receiving cavity 142, and the insulating component 15 covers the outer surface of the housing 14.

[0085] like Figures 4 to 8As shown, the top cover assembly 13 includes a top cover body 132 and a sealing structure 133. The top cover body 132 covers the opening 141 and closes the receiving cavity 142. The top cover body 132 has an injection hole 1321 and an internal cavity 1322. The sealing structure 133 includes a first sealing component 1331 and a second sealing component 1332. The first sealing component 1331 has a first state of sealing the injection hole 1321 and a second state of opening the injection hole 1321. The second sealing component 1332 is located on the side of the first sealing component 1331 facing the receiving cavity 142. The second sealing assembly 1332 is located inside the injection hole 1321 and can move along the axial direction of the injection hole 1321. It divides the injection hole 1321 into a first cavity 13211 and a second cavity 13212 that are not connected to each other. The second cavity 13212 is connected to the receiving cavity 142. When the first sealing assembly 1331 is in the second state, the second cavity 13212 and the cavity 1322 are not connected to each other, and the first cavity 13211 and the cavity 1322 are connected. When the first sealing assembly 1331 is in the first state, the second sealing assembly 1332 has a third state in which the second cavity 13212 is connected to the cavity 1322.

[0086] The top cover body 132 is equipped with two electrode terminals 131, which are electrically connected to other external components respectively.

[0087] Specifically, the first sealing assembly 1331 is located above the second sealing assembly 1332. The first sealing assembly 1331 has two states. Figure 6 In the first sealing assembly 1331, the liquid injection hole 1321 is sealed. The second sealing assembly 1332 can move upward or downward along the ZZ direction, where the ZZ direction is the height direction of the battery cell 10, which is the axial direction of the liquid injection hole 1321. Figure 6 In this configuration, the first cavity 13211 and the empty cavity 1322 are in a connected state, meaning that electrolyte can be injected into the first cavity 13211, and the electrolyte can flow from the first cavity 13211 into the empty cavity 1322. When the first sealing assembly 1331 is in the first state, the second sealing assembly 1332 also has a third state in which the second cavity 13212 and the empty cavity 1322 are connected. At this time, the first sealing assembly 1331 can seal the first cavity 13211, allowing the electrolyte to enter the second cavity 13212 from the empty cavity 1322, and then flow into the receiving cavity 142 of the housing 14, thus realizing the electrolyte injection process.

[0088] When venting is required, gas enters the second cavity 13212 from the accommodating cavity 142, pushing the sealing member 13322 upward. When the second cavity 13212 is connected to the cavity 1322, the gas will be transferred from the second cavity 13212 to the cavity 1322. Then, by applying external force to the second sealing assembly 1332, the first cavity 13211 can be connected to the cavity 1322, thus realizing the venting process.

[0089] Specifically, the first sealing component 1331 can be a sealing pin, which is inserted into the injection hole 1321 of the top cover body 132. This can be an interference fit, and the first sealing component 1331 can be removed when needed. Alternatively, the sealing pin can be welded to the top cover body 132 to seal the injection hole 1321. If the state of the sealing pin needs to be changed, it can be removed mechanically.

[0090] Electrode assembly 11 is a component in the battery cell 10 where an electrochemical reaction occurs. The housing 14 may contain one or more electrode assemblies 11. Electrode assembly 11 includes a main body 111 and tabs 112 protruding from the main body 111. The main body 111 includes a first electrode, a second electrode, and a separator. The first and second electrodes have opposite polarities, and the separator is used to insulate and isolate the first and second electrodes. The first electrode, second electrode, and separator can be formed by winding or by stacking. The first electrode includes a first coating area coated with a first active material layer, and the second electrode includes a second coating area coated with a second active material layer. Tabs 112 can be positive or negative tabs, wherein the positive and negative tabs can be located together at one end of the main body 111 or respectively at both ends of the main body 111. During the charging and discharging process of the battery cell 10, the first and second active materials react with the electrolyte, and the tabs 112 connect to the electrode terminals 131 to form a current loop.

[0091] Furthermore, the adapter 12 here can be in the form of a sheet, strip, block, or other shapes, as long as it can electrically connect the tab 112 to the electrode terminal 131. The insulating component 15 here can be a film structure with insulating function, and can be a blue film or an insulating structure of other colors.

[0092] The battery cell 10 of this application embodiment comprises a housing 14, an electrode assembly 11, and a top cover assembly 13. The top cover assembly 13 includes a top cover body 132 and a sealing structure 133. The top cover body 132 covers the opening 141 and closes the accommodating cavity 142. The top cover body 132 has an injection hole 1321 and an internal cavity 1322. The sealing structure 133 includes a first sealing component 1331 and a second sealing component 1332. The first sealing component 1331 has a first state of sealing the injection hole 1321 and a second state of opening the injection hole 1321. The second sealing component 1332 is disposed on the side of the first sealing component 1331 facing the accommodating cavity 142. The second sealing component 1332 is disposed within the injection hole 1321 and is movable along the axial direction of the injection hole 1321. The sealing component 1332 divides the injection hole 1321 into a first cavity 13211 and a second cavity 13212 that are not interconnected. The second cavity 13212 is connected to the receiving cavity 142. When the first sealing component 1331 is in the second state, the second cavity 13212 and the empty cavity 1322 are not interconnected, while the first cavity 13211 and the empty cavity 1322 are connected. When the first sealing component 1331 is in the first state, the second sealing component 1332 has a third state in which the second cavity 13212 is connected to the empty cavity 1322. Therefore, when the first sealing component 1331 is in the second state and electrolyte is injected into the first cavity 13211, the receiving cavity 142 can be sealed by the second sealing component 1332, reducing the probability of electrolyte leakage or external contaminants entering the receiving cavity 142. In addition, when the first sealing assembly 1331 is in the first state, the second sealing assembly 1332 is in the third state, which allows the gas in the second cavity 13212 to be discharged into the cavity 1322. Then, when the first sealing assembly 1331 is in the second state, the gas in the cavity 1322 is discharged outward through the first cavity 13211, thus realizing the exhaust process of the battery cell 10.

[0093] Optionally, such as Figure 6 As shown, the second sealing assembly 1332 includes a pressing member 13321 and a sealing member 13322 connected to each other. The outer wall surface of the sealing member 13322 abuts against the inner wall surface of the injection hole 1321 and divides the injection hole 1321 into a first cavity 13211 and a second cavity 13212 that are sealed and isolated from each other. The pressing member 13321 is provided on the side of the sealing member 13322 facing the first sealing assembly 1331.

[0094] It should be noted that the shape formed by the seal 13322 and the wall of the injection hole 1321 is consistent. Figure 6In this design, the sealing element 13322 has a cylindrical structure, and the wall of the injection hole 1321 forms a cylindrical structure. The pressing element 13321 is located above the sealing element 13322, allowing for easy movement of the sealing element 13322 by applying external force. For example, pressing the pressing element 13321 with external force causes the sealing element 13322 to move downwards along the axial direction of the injection hole 1321. Alternatively, pulling the pressing element 13321 upwards with external force causes the sealing element 13322 to move upwards along the axial direction of the injection hole 1321.

[0095] In the embodiments of this application, the second sealing assembly 1332 includes a pressing member 13321 and a sealing member 13322 connected to each other. The outer wall surface of the sealing member 13322 abuts against the inner wall surface of the injection hole 1321, dividing the injection hole 1321 into a first cavity 13211 and a second cavity 13212 that are sealed and isolated from each other. The pressing member 13321 is provided on the side of the sealing member 13322 facing the first sealing assembly 1331. By pressing the pressing member 13321, the sealing member 13322 can be moved downward along the axial position of the injection hole 1321, so that the first cavity 13211 communicates with the cavity 1322, facilitating the flow of electrolyte from the first cavity 13211 into the cavity 1322.

[0096] Optionally, such as Figure 6 As shown, the battery cell 10 also includes a limiting member 134, which is disposed in the first cavity 13211 along the axial direction of the injection hole 1321. The limiting member 134 is spaced apart from the sealing member 13322 and is connected to the wall of the first cavity 13211 to limit the position of the sealing member 13322 moving along the axial direction of the injection hole 1321.

[0097] It should be noted that the limiting component 134 here needs to have high strength. It can be made of metal, such as magnesium alloy or titanium alloy, or stainless steel.

[0098] The upward movement of the sealing element 13322 can be limited by the limiting member 134. The limiting member 134 is fixedly disposed within the first cavity 13211 and can be fixed by bonding or welding. That is, the limiting member 134 can be connected to the wall of the first cavity 13211 by bonding or welding. Furthermore, the limiting member 134 and the sealing element 13322 are spaced apart, with the limiting member 134 positioned above the sealing element 13322, thus limiting the highest upward movement position of the sealing element 13322.

[0099] In the embodiments of this application, a limiting member 134 is provided. The limiting member 134 is disposed in the first cavity 13211 along the axial direction of the injection hole 1321. The limiting member 134 is spaced apart from the sealing member 13322 and is connected to the wall of the first cavity 13211. This limits the position of the sealing member 13322 moving along the axial direction of the injection hole 1321. This limits the upward movement of the sealing member 13322 along the axial direction of the injection hole 1321, reducing the probability of the pressing member 13321 contacting the first sealing assembly 1331.

[0100] Optionally, such as Figures 6 to 8 As shown, the limiting member 134 is provided with a clearance hole 1341, which is correspondingly provided with the pressing member 13321 so that when the second sealing component 1332 is in the third state, the pressing member 13321 can be inserted into the clearance hole 1341.

[0101] Specifically, the limiting member 134 has a disc-shaped structure, and a limiting hole is formed on the disc-shaped structure. The limiting hole is provided to pass through the limiting member 134 along the axial direction of the injection hole 1321, so that the pressing member 13321 can be inserted into the clearance hole 1341, thereby forming clearance for the pressing member 13321.

[0102] In the embodiments of this application, a clearance hole 1341 is provided on the limiting member 134, and the clearance hole 1341 is correspondingly provided with the pressing member 13321, so that when the second sealing component 1332 is in the third state, the pressing member 13321 can be inserted into the clearance hole 1341, so that the second sealing component 1332 can move upward, and the second sealing component 1332 can move upward or downward within a certain range.

[0103] Optionally, such as Figures 6 to 8 As shown, there are at least two pressing elements 13321, and at least two pressing elements 13321 are arranged at intervals around the axis of the injection hole 1321; the number of clearance holes 1341 is the same as the number of pressing elements 13321, and each clearance hole 1341 is corresponding to one pressing element 13321.

[0104] exist Figure 7 In the middle, there are four pressing parts 13321, which are arranged in a circle around the axis of the injection hole 1321. There are also four clearance holes 1341, which are fan-shaped in cross-section. Each fan-shaped clearance hole 1341 can be inserted into one pressing part 13321.

[0105] Alternatively, the number of pressing elements 13321 can be set to three. In this case, the number of clearance holes 1341 is also three, with each clearance hole 1341 corresponding to one of the three pressing elements 13321. Alternatively, the number of pressing elements 13321 can be six. In this case, the number of clearance holes 1341 is also six, with each clearance hole 1341 corresponding to one of the six pressing elements 13321.

[0106] It should be noted that when applying external force to the pressing element 13321, different pressing elements 13321 can be applied simultaneously, or a specific pressing element 13321 can be applied selectively. Considering the motion balance of the sealing element 13322, the pressing element 13321 can be pressed symmetrically to ensure that the external force applied to the sealing element 13322 is balanced.

[0107] In the embodiments of this application, the number of pressing members 13321 is set to at least two, and the at least two pressing members 13321 are arranged around the axis of the injection hole 1321. The number of clearance holes 1341 is the same as the number of pressing members 13321, and each clearance hole 1341 is corresponding to one pressing member 13321. Therefore, according to the number and position of pressing members 13321, clearance holes 1341 corresponding to pressing members 13321 can be set to reduce the probability of pressing members 13321 being blocked.

[0108] Optionally, such as Figure 8 As shown, the wall of the first cavity 13211 is provided with a groove 13213, and the limiting member 134 is embedded in the groove 13213.

[0109] The groove 13213 here has a circular structure and the cross-section of the groove 13213 is U-shaped or rectangular. The circumferential edge of the limiting member 134 is located inside the groove 13213, so that the limiting member 134 can be embedded in the groove 13213.

[0110] In the embodiments of this application, a groove 13213 is provided on the wall of the first cavity 13211, and the limiting member 134 is embedded in the groove 13213, so that the limiting member 134 can be stably disposed in the groove 13213, thereby achieving stable installation of the limiting member 134.

[0111] Optionally, such as Figure 6 and Figure 8 As shown, the battery cell 10 also includes an elastic member 135, the two ends of which abut against the limiting member 134 and the sealing member 13322, respectively.

[0112] It should be noted that the elastic element 135 can be a spring structure. The elastic element 135 is arranged along the axial direction of the injection hole 1321. That is to say, the axial direction of the elastic element 135 is the same as or parallel to the axial direction of the injection hole 1321.

[0113] In the embodiments of this application, an elastic element 135 is provided, with its two ends abutting against the limiting element 134 and the sealing element 13322 respectively. The compression of the elastic element 135 between the sealing element 13322 and the limiting element 134 provides a force to the sealing element 13322, making the movement of the sealing element 13322 smoother and more stable.

[0114] It is understandable that the position where the elastic member 135 abuts against the limiting member 134 avoids the clearance hole 1341. In other words, the position where the elastic member 135 contacts the limiting member 134 is the physical position of the limiting member 134.

[0115] Optionally, such as Figure 6 As shown, the axis of the elastic element 135 is aligned with the axis of the injection hole 1321.

[0116] The injection hole 1321 is located at the center of the top cover body 132 along the XX direction. The axis of the injection hole 1321 is consistent with the center line of the top cover body 132 along the XX direction, where the XX direction is the length direction of the battery cell 10. Therefore, the axis of the elastic element 135 is aligned with the axis of the injection hole 1321, which allows the elastic element 135 to be placed at the center of the injection hole 1321. This makes the force exerted by the elastic element 135 on the seal 13322 more balanced, reducing the probability of the seal 13322 tilting during movement.

[0117] In the embodiments of this application, by aligning the axis of the elastic element 135 with the axis of the injection hole 1321, the elastic element 135 can be positioned at the center of the injection hole 1321, making the force exerted by the elastic element 135 on the seal 13322 more balanced and reducing the probability of the seal 13322 tilting.

[0118] Optionally, such as Figure 8 As shown, along the axial direction of the injection hole 1321, the size of the cavity 1322 is smaller than the size of the seal 13322.

[0119] exist Figure 8 In this design, the dimension of the cavity 1322 along the axial direction of the injection hole 1321 is characterized by H1, and the dimension of the seal 13322 along the axial direction of the injection hole 1321 is characterized by H2, where H2 is greater than H1, thus enabling the seal 13322 to seal the cavity 1322. Figure 6In this configuration, the first cavity 13211 is in communication with the cavity 1322, while the second cavity 13212 is not in communication with the cavity 1322. At this time, the gas in the cavity 1322 can enter the first cavity 13211. When the first sealing assembly 1331 is in the open state, the exhaust process of the battery cell 10 can be realized.

[0120] In the embodiments of this application, by making the size of the cavity 1322 smaller than the size of the seal 13322 along the axial direction of the injection hole 1321, the seal 13322 can completely seal the cavity 1322, which facilitates the communication between the first cavity 13211 and the cavity 1322 or between the second cavity 13212 and the cavity 1322, and prevents the cavity 1322 from being simultaneously connected to the first cavity 13211 and the second cavity 13212.

[0121] Optionally, the seal 13322 is a non-metallic component.

[0122] Specifically, the seal 13322 here can be made of rubber or ceramic, which can reduce the chance of being corroded by the electrolyte.

[0123] By making the seal 13322 a non-metallic part in the embodiments of this application, the probability of the seal 13322 being corroded by the electrolyte can be reduced.

[0124] Optionally, the cavity 1322 is located inside the top cover body 132. It can be formed on one side of the seal 13322, or cavities 1322 can be formed on both sides of the seal 13322. Figure 6 In the middle, the cavity 1322 is divided into two parts by the seal 13322, that is, the seal 13322 has cavities 1322 on both the left and right sides.

[0125] It should be noted that when the battery cell 10 is in a normal state, the upper surface of the seal 13322 is higher than the upper surface of the cavity 1322, and the lower surface of the seal 13322 is lower than the lower surface of the cavity 1322. At this time, the seal 13322 can form a complete seal on the cavity 1322.

[0126] When the internal gas of the battery cell 10 increases, the pressure in the second chamber 13212 also increases. At this time, the pressure in the second chamber 13212 will push the seal 13322 upward. The upper surface of the seal 13322 will then be higher than the lower surface of the cavity 1322, allowing gas to enter the cavity 1322 from the second chamber 13212. When it is necessary to vent the battery cell 10, the first sealing assembly 1331 is opened, and the seal 13322 is pushed downward, thus connecting the first chamber 13211 and the cavity 1322. This allows the gas in the cavity 1322 to be discharged outward through the first chamber 13211, achieving venting of the battery cell 10. Throughout the venting process, the electrolyte in the accommodating cavity 142 is kept sealed, reducing the chance of contamination of the electrolyte in the accommodating cavity 142.

[0127] In addition, when the battery cell 10 needs to be replenished with electrolyte, the electrolyte is injected into the first cavity 13211. By pushing the pressing member 13321 downward, the first cavity 13211 will be in communication with the cavity 1322, allowing the electrolyte to enter the cavity 1322. By moving the pressing member 13321 upward, the second cavity 13212 will be in communication with the cavity 1322, allowing the electrolyte to enter from the cavity 1322 into the second cavity 13212, and finally flow into the receiving cavity 142, thus replenishing the electrolyte. Throughout the venting process, the electrolyte in the receiving cavity 142 can be kept sealed, reducing the chance of the electrolyte in the receiving cavity 142 being contaminated.

[0128] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below.

[0129] A first aspect of the embodiments of this application provides a battery cell 10, which includes a housing 14, an electrode assembly 11, and a top cover assembly 13. The housing 14 has an opening 141 and a receiving cavity 142 communicating with the opening 141. The electrode assembly 11 is disposed in the receiving cavity 142. The top cover assembly 13 includes a top cover body 132 and a sealing structure 133. The top cover body 132 covers the opening 141 and closes the receiving cavity 142. The top cover body 132 has an injection hole 1321 and an internal cavity 1322. The sealing structure 133 includes a first sealing component 1331 and a second sealing component 1332, wherein the first sealing component 1331 has a first state of sealing the injection hole 1321 and a second state of opening the injection hole 1321. In the first sealing assembly 1331, the second sealing assembly 1332 is disposed on the side of the first sealing assembly 1331 facing the accommodating cavity 142. The second sealing assembly 1332 is disposed within the injection hole 1321 and is movable along the axial direction of the injection hole 1321. The second sealing assembly 1332 divides the injection hole 1321 into a first cavity 13211 and a second cavity 13212 that are not interconnected. The second cavity 13212 is connected to the accommodating cavity 142. When the first sealing assembly 1331 is in the second state, the second cavity 13212 and the cavity 1322 are not interconnected, and the first cavity 13211 and the cavity 1322 are connected. When the first sealing assembly 1331 is in the first state, the second sealing assembly 1332 has a third state in which the second cavity 13212 is connected to the cavity 1322. Furthermore, the second sealing assembly 1332 includes a pressing member 13321 and a sealing member 13322 connected to each other. The outer wall surface of the sealing member 13322 abuts against the inner wall surface of the injection hole 1321, dividing the injection hole 1321 into a first cavity 13211 and a second cavity 13212 that are sealed and isolated from each other. The pressing member 13321 is provided on the side of the sealing member 13322 facing the first sealing assembly 1331. Furthermore, the battery cell 10 also includes a limiting member 134, which is disposed in the first cavity 13211 and connected to the wall of the first cavity 13211. Along the axial direction of the injection hole 1321, the limiting member 134 is disposed between the first sealing assembly 1331 and the sealing member 13322 to limit the position of the sealing member 13322 moving along the axial direction of the injection hole 1321. Furthermore, the limiting member 134 is provided with a clearance hole 1341, which is correspondingly provided with the pressing member 13321, so that when the second sealing assembly 1332 is in the third state, the pressing member 13321 can be inserted into the clearance hole 1341. Furthermore, the number of pressing members 13321 is at least two, and the at least two pressing members 13321 are arranged at intervals around the axis of the injection hole 1321; the number of clearance holes 1341 is the same as the number of pressing members 13321, and each clearance hole 1341 is correspondingly provided with one pressing member 13321.Furthermore, the wall of the first cavity 13211 is provided with a groove 13213, and the limiting member 134 is embedded in the groove 13213. Furthermore, the battery cell 10 also includes an elastic member 135, with both ends of the elastic member 135 abutting against the limiting member 134 and the sealing member 13322, respectively. Furthermore, the axis of the elastic member 135 coincides with the axis of the injection hole 1321. Furthermore, along the axial direction of the injection hole 1321, the size of the cavity 1322 is smaller than the size of the sealing member 13322. Furthermore, the sealing member 13322 is a non-metallic component.

[0130] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery cell, characterized in that, include: A housing having an opening, and an accommodating cavity communicating with the opening inside the housing; An electrode assembly disposed within the accommodating cavity; as well as A top cover assembly includes a top cover body and a sealing structure. The top cover body covers the opening and closes the receiving cavity. The top cover body has an injection hole and an internal cavity. The sealing structure includes a first sealing component and a second sealing component. The first sealing component has a first state of sealing the injection hole and a second state of opening the injection hole. The second sealing component is located on the side of the first sealing component facing the receiving cavity. The second sealing component is located inside the injection hole and can move axially along the injection hole. The second sealing component divides the injection hole into a first cavity and a second cavity that are not interconnected. The second cavity is connected to the receiving cavity. When the first sealing component is in the second state, the second cavity and the empty cavity are not interconnected, and the first cavity and the empty cavity are connected. When the first sealing component is in the first state, the second sealing component has a third state in which the second cavity is connected to the empty cavity.

2. The battery cell as described in claim 1, characterized in that, The second sealing assembly includes: The pressing element and the sealing element are connected to each other. The outer wall surface of the sealing element abuts against the inner wall surface of the injection hole and divides the injection hole into a first cavity and a second cavity that are sealed and isolated from each other. The pressing element is provided on the side of the sealing element facing the first sealing assembly.

3. The battery cell as described in claim 2, characterized in that, The battery cell also includes a limiting member, which is disposed in the first cavity and connected to the wall of the first cavity. The limiting member is disposed between the first sealing assembly and the sealing member to limit the position of the sealing member moving axially along the injection hole.

4. The battery cell as described in claim 3, characterized in that, The limiting member is provided with a clearance hole, which is correspondingly provided with the pressing member so that when the second sealing component is in the third state, the pressing member can be inserted into the clearance hole.

5. The battery cell as described in claim 4, characterized in that, The number of pressing elements is at least two, and the at least two pressing elements are arranged at intervals around the axis of the injection hole; the number of clearance holes is the same as the number of pressing elements, and each clearance hole corresponds to one pressing element.

6. The battery cell as described in claim 3, characterized in that, The first cavity has a groove on its wall, and the limiting member is embedded in the groove.

7. The battery cell as described in claim 3, characterized in that, The battery cell also includes an elastic element, the two ends of which abut against the limiting element and the sealing element, respectively.

8. The battery cell as described in claim 7, characterized in that, The axis of the elastic element is aligned with the axis of the injection hole.

9. The battery cell according to any one of claims 2 to 8, characterized in that, Along the axial direction of the injection hole, the size of the cavity is smaller than the size of the seal.

10. The battery cell according to any one of claims 2 to 8, characterized in that, The sealing element is a non-metallic component.

11. A battery device, characterized in that, The battery device includes: The battery cell as described in any one of claims 1 to 10; and The battery cell is housed within the housing.

12. An electrical appliance, characterized in that, Includes the battery device as described in claim 11, the battery device being used to supply power to the electrical device.

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