Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization device, wherein the battery monomer comprises an end cover, a plastic part and a blocking part, the plastic part is arranged on one side of the end cover facing the battery cell, the end cover is provided with a liquid injection hole, the liquid injection hole penetrates the plastic part, and the blocking part is arranged on the side of the plastic part away from the end cover; the blocking part is configured to seal the liquid injection hole or open the liquid injection hole. The application provides the above-mentioned scheme, when the electrolyte is injected, the injection pressure acts on the blocking part, so that the blocking part opens the liquid injection hole, at this time, the electrolyte is injected into the battery cell, and after the injection is completed, the blocking part seals the liquid injection hole again, so that the electrolyte is prevented from overflowing when the battery cell is poured. In the process of injecting the electrolyte, the injection pressure is buffered by the blocking part, and in the process of injecting the electrolyte, the blocking part can change the liquid flow direction, effectively avoiding the problem that the electrolyte directly hits the side of the winding layer of the battery cell in the injection process, and reducing the occurrence of the battery cell being scattered and the separator being wrinkled.

Description

Technical Field

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

[0002] The battery mainly consists of a casing, battery cells, and a top cover. The top cover is installed on top of the casing and, together with the casing, forms an assembly cavity, in which the battery cells are installed. The top cover has an injection hole for injecting electrolyte into the assembly cavity.

[0003] When using the injection hole in the related technology, the electrolyte may directly flow onto the side of the cell winding during the injection process, which may lead to the risk of diaphragm wrinkles. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can solve the problem of electrolyte directly hitting the side of the cell roll layer during the electrolyte injection process, thereby causing the risk of separator wrinkles.

[0005] To address the aforementioned technical problems, in a first aspect, this application proposes a single battery cell, comprising: End cap; A plastic part is disposed on the side of the end cap facing the battery cell, and the end cap is provided with a liquid injection hole that penetrates the plastic part; A sealing element is disposed on the side of the plastic part opposite to the end cap, and the sealing element is configured to seal the injection hole or open the injection hole.

[0006] In the technical solution of this application embodiment, when electrolyte is injected through the injection hole, the injection pressure acts on the sealing member, causing the sealing member to open the injection hole. At this time, the electrolyte is injected into the battery cell. After the injection is completed, the sealing member reseals the injection hole to prevent electrolyte leakage when the battery cell is tilted. During the injection process, the sealing member buffers the injection pressure. At the same time, the sealing member can change the liquid flow direction during the injection process, effectively avoiding the problem of electrolyte directly hitting the side of the battery cell roll layer during the injection process, reducing the occurrence of battery cell disintegration and diaphragm wrinkling, thereby improving the injection effect.

[0007] In some embodiments, the sealing element includes an elastic element and a sealing head; The elastic element is disposed on the side of the plastic part away from the end cap, and is connected to the sealing head. The elastic element is configured to drive the sealing head into or away from the injection hole. In this way, the force of the elastic element facilitates sealing or opening the injection hole.

[0008] In some embodiments, the elastic element includes a spring and a connecting plate, one end of the spring being connected to the side of the plastic part away from the end cap, and the other end of the spring being connected to the connecting plate; The sealing head is positioned on the side of the connecting plate facing the plastic part. In this way, the sealing head can move synchronously with the connecting plate driven by the spring, allowing it to either seal or open the injection hole.

[0009] In some embodiments, the projection of the injection hole on the connecting plate is located within the connecting plate.

[0010] In this way, the electrolyte injected from the injection hole will all flow onto the connecting plate. At this time, under the obstruction of the connecting plate, the electrolyte will diffuse to the periphery of the connecting plate and then be injected into the cell. This avoids the problem of the electrolyte directly hitting the side of the cell roll during the injection process, reduces the occurrence of the cell being scattered and the diaphragm wrinkling, thereby improving the injection effect.

[0011] In some embodiments, the surfaces of the elastic element and / or the sealing head are provided with a corrosion-resistant layer. This prevents the elastic element and sealing head from being corroded by the electrolyte during use, effectively improving their service life.

[0012] In some embodiments, the sealing element includes a baffle and a sealing head; The baffle is located on the side of the plastic part away from the end cap, and the sealing head is located on the side of the baffle facing the plastic part. The baffle is configured to drive the sealing head into or away from the injection hole. In this way, the baffle can drive the sealing head to seal or open the injection hole.

[0013] In some embodiments, the baffle includes an inclined portion and a horizontal portion, one end of the inclined portion is connected to the side of the plastic part away from the end cap, and the other end of the inclined portion is connected to the horizontal portion; The sealing head is positioned on the side of the horizontal portion facing the plastic part. In this way, the inclined portion applies force to the horizontal portion, initially sealing the injection hole; during injection, the sealing head, under the injection pressure, moves the horizontal portion away from the plastic part; after injection, the inclined portion returns the horizontal portion to its initial state, thus allowing the sealing head to either seal or open the injection hole.

[0014] In some embodiments, the projection of the injection hole onto the horizontal portion is located within the horizontal portion. In this way, all the electrolyte injected from the injection hole flows onto the horizontal portion. Then, blocked by the horizontal portion, the electrolyte diffuses to the periphery of the horizontal portion before being injected into the battery cell. This avoids the problem of electrolyte directly hitting the side of the battery cell winding during injection, reducing the occurrence of battery cell disintegration and separator wrinkling, thereby improving the injection effect.

[0015] In some embodiments, the surface of the baffle and / or the sealing head is provided with a corrosion-resistant layer. This prevents the baffle and sealing head from being corroded by the electrolyte during use, effectively improving their service life.

[0016] Secondly, this application proposes a battery device comprising a battery cell as described in any one of the embodiments of this application.

[0017] Thirdly, this application proposes an electrical device, including a battery device as described in the embodiments of this application.

[0018] 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, the following are specific embodiments of this application. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the embodiments described below. 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: Figure 1 This is a schematic diagram of the structure of an electrical device provided in some embodiments of this application; Figure 2 This application provides schematic diagrams of the battery structure for some embodiments. Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application; Figure 4 Schematic diagram of end cap provided for some embodiments of this application; Figure 5 for Figure 4 The main view; Figure 6 for Figure 5 Enlarged view of point A in the middle; Figure 7 This is a schematic diagram of the electrolyte injection process provided in some embodiments of this application; Figure 8Another schematic diagram of an end cap provided for some embodiments of this application; Figure 9 for Figure 8 Enlarged diagram of point B in the image.

[0020] The reference numerals in the detailed embodiments are as follows: 1000, vehicles; 100. Battery; 200. Controller; 300. Motor; 110. Housing; 111. First part; 112. Second part; 120. Battery cell; 121. Housing; 122. End cap; 1221. Liquid filling hole; 123. Electrode assembly; 130. Sealing component; 131. Elastic component; 1311. Spring; 1312. Connecting plate; 132. Sealing head; 133. Baffle; 1331. Inclined part; 1332. Horizontal part. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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).

[0027] 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 are not intended to 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.

[0028] In the description of the embodiments of this application, unless otherwise expressly specified and limited, 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0029] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used 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 power battery applications, market demand is also constantly increasing.

[0030] In related technologies, a battery mainly includes a casing, a battery cell, and a battery top cover. The battery top cover is installed on top of the casing and, together with the casing, forms an assembly cavity, in which the battery cell is installed. The battery top cover has an injection hole for injecting electrolyte into the assembly cavity.

[0031] When electrolyte is injected through the injection hole, the electrolyte will directly impact the side of the cell winding, which may lead to the risk of diaphragm wrinkling.

[0032] Based on the above considerations, in order to solve the problem of electrolyte directly flowing onto the side of the cell roll during the electrolyte injection process, which may lead to the risk of separator wrinkling, a battery cell was designed. The battery cell includes an end cap, a plastic part, and a sealing part. The plastic part is located on the side of the end cap facing the cell, and the end cap has an injection hole that penetrates the plastic part. The sealing part is located on the side of the plastic part away from the end cap, and the sealing part is configured to either seal the injection hole or open the injection hole.

[0033] In the technical solution of this application embodiment, when electrolyte is injected through the injection hole, the injection pressure acts on the sealing member, causing the sealing member to open the injection hole. At this time, the electrolyte is injected into the battery cell. After the injection is completed, the sealing member reseals the injection hole to prevent electrolyte leakage when the battery cell is tilted. During the injection process, the sealing member buffers the injection pressure. At the same time, the sealing member can change the liquid flow direction during the injection process, effectively avoiding the problem of electrolyte directly hitting the side of the battery cell roll layer during the injection process, reducing the occurrence of battery cell disintegration and diaphragm wrinkling, thereby improving the injection effect.

[0034] In this application, "battery" refers to a single physical module comprising one or more individual battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery pack, etc. Batteries can serve as a power source or power system for electrical devices, which helps improve the overall performance of the battery and facilitates its widespread adoption.

[0035] The aforementioned electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0036] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0037] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The 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 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0038] In some embodiments of this application, the battery 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.

[0039] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 110 and a battery cell 120, with the battery cell 120 housed within the housing 110. The housing 110 provides a accommodating space for the battery cell 120, and the housing 110 can adopt various structures. In some embodiments, the housing 110 may include a first portion 111 and a second portion 112, which overlap each other, and together define a accommodating space for accommodating the battery cell 120. The second portion 112 may be a hollow structure with one open end, and the first portion 111 may be a plate-like structure, with the first portion 111 covering the open side of the second portion 112 so that the first portion 111 and the second portion 112 together define the accommodating space; alternatively, the first portion 111 and the second portion 112 may both be hollow structures with one open side, with the open side of the first portion 111 covering the open side of the second portion 112. Of course, the box 110 formed by the first part 111 and the second part 112 can be of various shapes, such as a cylinder, a cuboid, etc.

[0040] In battery 100, there can be multiple battery cells 120. These multiple battery cells 120 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 120 are connected in both series and parallel. Multiple battery cells 120 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 120 is housed within housing 110. Alternatively, battery 100 can also consist of multiple battery cells 120 first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within housing 110. Battery 100 may also include other structures; for example, battery 100 may also include a busbar component for electrical connection between multiple battery cells 120.

[0041] Each battery cell 120 can be a secondary battery or a primary battery; it 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 120 can be cylindrical, flat, cuboid, or other shapes.

[0042] like Figure 3 As shown, the battery cell 120 may include a housing, an electrode assembly 123, and electrode terminals. The housing includes a casing 121 and an end cap 122. The casing 121 has an opening, and the end cap 122 closes the opening to isolate the internal environment of the battery cell 120 from the external environment.

[0043] The housing 121 is an assembly used to cooperate with the end cap 122 to form the internal environment of the battery cell 120, wherein the formed internal environment can accommodate the electrode assembly 123, electrolyte, and other components. The housing 121 and the end cap 122 can be independent components. The housing 121 can have various shapes and sizes. Specifically, the shape of the housing 121 can be determined according to the specific shape and size of the electrode assembly 123. The housing 121 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0044] End cap 122 refers to a component that covers the opening of housing 121 to isolate the internal environment of battery cell 120 from the external environment. The shape of end cap 122 can be adapted to the shape of housing 121 to fit it. Optionally, end cap 122 can be made of a material with certain hardness and strength, such as aluminum alloy. This makes end cap 122 less prone to deformation under pressure and impact, allowing battery cell 120 to have higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on end cap 122. Electrode terminals can be used for electrical connection with electrode assembly 123 to output or input electrical energy to battery cell 120. The material of end cap 122 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating structure can also be provided on the inner side of end cap 122. The insulating structure can be used to isolate the electrical connection components inside housing 121 from end cap 122 to reduce the risk of short circuit. For example, the insulating structure can be made of plastic, rubber, etc.

[0045] Electrode assembly 123 is the component in the battery cell 120 where electrochemical reactions occur. The housing 121 may contain one or more electrode assemblies 123. The electrode assembly 123 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 electrode assembly 123, 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 100, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop. Furthermore, the electrode assembly 123 can be a wound structure or a stacked structure.

[0046] In some embodiments, the battery cell 120 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 120 reaches a threshold.

[0047] According to some embodiments of this application, Figure 4 This is a schematic diagram of the end cap in this application. Figure 4As shown, this application provides a battery cell, which includes an end cap 122, a plastic part, and a sealing part 130. The plastic part (not shown) is disposed on the side of the end cap 122 facing the battery cell. The end cap 122 is provided with an injection hole 1221, which penetrates the plastic part. The sealing part 130 is disposed on the side of the plastic part away from the end cap 122. The sealing part 130 is configured to seal the injection hole 1221 or open the injection hole 1221.

[0048] In this embodiment, the plastic part can be snapped onto the side of the end cap 122 facing the battery cell. The material of the plastic part can be polybutylene terephthalate, polyphenylene sulfide, etc., and the specific material can be determined according to the actual situation. This embodiment does not limit this.

[0049] In this embodiment, by fixing the plastic part to the side of the end cap 122 facing the battery cell, the end cap 122 is physically isolated from the battery cell, preventing direct contact between the two from causing an internal short circuit.

[0050] In this embodiment, the sealing component 130 can be fixed to the side of the plastic part away from the end cap 122 by bolts or snap-fit, which is not limited here.

[0051] During use, when electrolyte is injected through the injection port 1221, the injection pressure acts on the sealing component 130, causing it to open the injection port 1221. At this point, the electrolyte is injected into the battery cell. After injection, the sealing component 130 reseals the injection port 1221 to prevent electrolyte leakage when the battery cell is tilted. During the injection process, the sealing component 130 buffers the injection pressure and can also change the liquid flow direction, effectively preventing the electrolyte from directly impacting the side of the battery cell windings. This reduces the risk of the battery cell being scattered and the diaphragm wrinkling, thus improving the injection effect.

[0052] According to some embodiments of this application, such as Figure 5 and combined Figure 6 As shown, the sealing member 130 includes an elastic member 131 and a sealing head 132. The elastic member 131 is disposed on the side of the plastic part away from the end cap 122, and the elastic member 131 is connected to the sealing head 132. The elastic member 131 is configured to drive the sealing head 132 to extend into or away from the injection hole 1221.

[0053] In this embodiment, the elastic element 131 can refer to something that can deform under the action of external force and return to its original shape after the external force is removed. The elastic element 131 can be elastically compressed in the direction of liquid injection. The elastic element 131 can be made of metal or non-metal, such as leaf spring, helical spring, gas spring, rubber spring, etc. The specific material can be determined according to the actual situation. This embodiment of the specification does not limit this.

[0054] In this embodiment, the elastic element 131 can be snapped onto the side of the plastic part away from the end cap 122, and at the same time, the end of the elastic element 131 facing the plastic part is connected to the sealing head 132.

[0055] The sealing head 132 in this embodiment can be made of polyimide, rubber, etc., and there is no limitation here.

[0056] In the initial state, the elastic force of the elastic element 131 acting on the sealing head 132 causes the sealing head 132 to extend into the injection hole 1221, at which point the sealing head 132 seals the corresponding injection hole 1221. When electrolyte is injected, the injection pressure acts on the sealing head 132, pushing it downwards. Simultaneously, the sealing head 132 compresses the elastic element 131. As the sealing head 132 gradually separates from the injection hole 1221, electrolyte is injected into the cell. After injection, the sealing head 132, under the reaction force of the elastic element 131, re-inserts into the injection hole 1221 to seal it. Throughout the entire process, the force of the elastic element 131 easily drives the sealing head 132 to seal or open the injection hole 1221.

[0057] According to some embodiments of this application, such as Figure 6 and combined Figure 7 As shown, the elastic element 131 includes a spring 1311 and a connecting plate 1312. One end of the spring 1311 is connected to the side of the plastic part away from the end cap 122, and the other end of the spring 1311 is connected to the connecting plate 1312. The sealing head 132 is disposed on the side of the connecting plate 1312 facing the plastic part.

[0058] The elastic element 131 in this embodiment may include two springs 1311, three springs 1311, etc., and is not limited here. For ease of explanation, the following description will use two springs 1311 as an example.

[0059] refer to Figure 6 As shown, both springs 1311 are connected to the plastic part on the side away from the end cap 122. The lower ends of the two springs 1311 are connected to the two ends of the connecting plate 1312 respectively. The sealing head 132 can be bolted or snapped onto the side of the connecting plate 1312 facing the plastic part.

[0060] In the initial state, the tension of the spring 1311 acting on the connecting plate 1312 causes the sealing head 132 to extend into the injection hole 1221. When electrolyte is injected, the injection pressure acts on the sealing head 132, pushing the sealing head 132 downward. At this time, the sealing head 132 simultaneously drives the connecting plate 1312 downward, and the connecting plate 1312 simultaneously drives the spring 1311 to extend. After the sealing head 132 opens the injection hole 1221, the electrolyte is injected into the battery cell. After the injection is completed, the pressure acting on the sealing head 132 disappears. At this time, the spring 1311 contracts upward, and the spring 1311 drives the sealing head 132 upward through the connecting plate 1312, finally causing the sealing head 132 to re-extend into the injection hole 1221 and seal the injection hole 1221.

[0061] According to some embodiments of this application, the projection of the injection hole 1221 on the connecting plate 1312 is located within the connecting plate 1312. In this way, all the electrolyte injected from the injection hole 1221 flows onto the connecting plate 1312. At this point, blocked by the connecting plate 1312, the electrolyte diffuses to the periphery of the connecting plate 1312 before being injected into the battery cell. This avoids the problem of electrolyte directly hitting the side of the battery cell winding during injection, reducing the occurrence of battery cell disintegration and separator wrinkling, thereby improving the injection effect.

[0062] According to some embodiments of this application, the surfaces of the elastic element 131 and / or the sealing head 132 are provided with a corrosion-resistant layer. For ease of explanation, the following description will use the example of both the elastic element 131 and the sealing head 132 having a corrosion-resistant layer.

[0063] The corrosion-resistant material in this embodiment can be polyimide, polytetrafluoroethylene, etc., and the specific material can be determined according to the actual situation. This specification does not limit this embodiment.

[0064] In this embodiment, a corrosion-resistant layer is provided on the surface of the elastic element 131 and the sealing head 132, which can prevent the elastic element 131 and the sealing head 132 from being corroded by the electrolyte during use, and effectively improve the service life of the elastic element 131 and the sealing head 132.

[0065] According to some embodiments of this application, such as Figure 8 and combined Figure 9 As shown, the sealing component 130 includes a baffle 133 and a sealing head 132. The baffle 133 is disposed on the side of the plastic part away from the end cap 122, and the sealing head 132 is disposed on the side of the baffle 133 facing the plastic part. The baffle 133 is configured to drive the sealing head 132 to extend into or away from the injection hole 1221.

[0066] In this embodiment, one end of the baffle 133 can be bolted to the side of the plastic part away from the end cap 122, and the other end of the baffle 133 is a free end, which can move up and down relative to the plastic part.

[0067] The sealing head 132 can be fixed to the side of the baffle 133 facing the plastic part by bolts or snap-fit, which is not limited here.

[0068] In the initial state, the baffle 133 drives the sealing head 132 to extend into the injection hole 1221. When electrolyte is injected, the injection pressure acts on the sealing head 132, pushing the sealing head 132 downward. At this time, the sealing head 132 simultaneously pushes the baffle 133. Since one end of the baffle 133 is a free end, the baffle 133 tilts under the thrust. At the same time, the sealing head 132 opens the injection hole 1221, and the electrolyte can be injected into the cell. After the injection is completed, the free end of the baffle 133 returns to the initial state, and the sealing head 132, driven by the baffle 133, re-extends into the injection hole 1221 to seal the injection hole 1221.

[0069] According to some embodiments of this application, such as Figure 9 As shown, the baffle 133 includes an inclined portion 1331 and a horizontal portion 1332. One end of the inclined portion 1331 is connected to the side of the plastic part away from the end cap 122, and the other end of the inclined portion 1331 is connected to the horizontal portion 1332. The sealing head 132 is disposed on the side of the horizontal portion 1332 facing the plastic part.

[0070] In this embodiment, the inclined portion 1331 and the horizontal portion 1332 are integrally formed. One end of the inclined portion 1331 can be bolted to the side of the plastic part away from the end cap 122, and the end of the horizontal portion 1332 away from the inclined portion 1331 is a free end. The baffle 133 formed by the inclined portion 1331 and the horizontal portion 1332 has a certain degree of elasticity. The sealing head 132 can be bolted or snapped onto the side of the horizontal portion 1332 facing the plastic part.

[0071] In the initial state, neither the inclined portion 1331 nor the horizontal portion 1332 deforms, and the sealing head 132 seals the injection hole 1221. During the injection process, the sealing head 132, under the action of the injection pressure, drives the horizontal portion 1332 to move away from the plastic part, and both the horizontal portion 1332 and the inclined portion 1331 deform. After the sealing head 132 opens the injection hole 1221, the electrolyte is injected into the battery cell. After the injection is completed, the inclined portion 1331 drives the horizontal portion 1332 to return to the initial state. At this time, the sealing head 132 reseals the injection hole 1221 under the force of the horizontal portion 1332.

[0072] According to some embodiments of this application, the projection of the injection hole 1221 onto the horizontal portion 1332 is located within the horizontal portion 1332. In this way, all the electrolyte injected from the injection hole 1221 flows onto the horizontal portion 1332. At this point, blocked by the horizontal portion 1332, the electrolyte diffuses to the periphery of the horizontal portion 1332 before being injected into the battery cell. This avoids the problem of electrolyte directly impacting the side of the battery cell winding during injection, reducing the occurrence of battery cell disintegration and separator wrinkling, thereby improving the injection effect.

[0073] According to some embodiments of this application, the surfaces of the baffle 133 and / or the sealing head 132 are provided with a corrosion-resistant layer. For ease of explanation, the following description will use the example of both the baffle 133 and the sealing head 132 having a corrosion-resistant layer.

[0074] The corrosion-resistant material in this embodiment can be polyimide, polytetrafluoroethylene, etc., and the specific material can be determined according to the actual situation. This specification does not limit this embodiment.

[0075] In this embodiment, a corrosion-resistant layer is provided on the surface of the baffle 133 and the sealing head 132, which can prevent the baffle 133 and the sealing head 132 from being corroded by the electrolyte during use, and effectively improve the service life of the baffle 133 and the sealing head 132.

[0076] This application also provides a battery device, including a battery cell as described in any of the embodiments of this application.

[0077] The specific structure of the battery cell in this embodiment refers to that in the above embodiments. Since the battery device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0078] This application also provides an electrical device, including a battery device as described in the embodiments of this application.

[0079] The specific structure of the battery device in this embodiment refers to the above embodiments. Since the power device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This 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 in that, include: End cap; A plastic part is disposed on the side of the end cap facing the battery cell, and the end cap is provided with a liquid injection hole that penetrates the plastic part; A sealing element is disposed on the side of the plastic part opposite to the end cap, and the sealing element is configured to seal the injection hole or open the injection hole.

2. The battery cell according to claim 1, characterized in that, The sealing component includes an elastic element and a sealing head; The elastic element is disposed on the side of the plastic part away from the end cap, and the elastic element is connected to the sealing head. The elastic element is configured to drive the sealing head to extend into or away from the injection hole.

3. The battery cell according to claim 2, characterized in that, The elastic element includes a spring and a connecting plate. One end of the spring is connected to the side of the plastic part away from the end cap, and the other end of the spring is connected to the connecting plate. The sealing head is located on the side of the connecting plate facing the plastic part.

4. The battery cell according to claim 3, characterized in that, The projection of the injection hole on the connecting plate is located inside the connecting plate.

5. The battery cell according to any one of claims 2 to 4, characterized in that, The surface of the elastic element and / or the sealing head is provided with a corrosion-resistant layer.

6. The battery cell according to claim 1, characterized in that, The sealing component includes a baffle and a sealing head; The baffle is disposed on the side of the plastic part away from the end cap, and the sealing head is disposed on the side of the baffle facing the plastic part. The baffle is configured to drive the sealing head to extend into or away from the injection hole.

7. The battery cell according to claim 6, characterized in that, The baffle includes an inclined portion and a horizontal portion. One end of the inclined portion is connected to the side of the plastic part away from the end cap, and the other end of the inclined portion is connected to the horizontal portion. The sealing head is located on the side of the horizontal portion facing the plastic part.

8. The battery cell according to claim 7, characterized in that, The projection of the injection hole on the horizontal part is located within the horizontal part.

9. The battery cell according to any one of claims 6 to 8, characterized in that, The surface of the baffle and / or the sealing head is provided with a corrosion-resistant layer.

10. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 9.

11. An electrical appliance, characterized in that, Includes the battery device as described in claim 10.

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