Cover plate assembly, battery cell, battery and electric device

Abstract

A cover plate assembly (10), a battery cell (103), a battery (100) and an electric device. The cover plate assembly (10) comprises a cover plate body (11) and an elastic sealing member (12), wherein the cover plate body (11) is provided with an electrolyte injection hole (11a), a flow guide hole (11b) and a mounting space (11c); both the electrolyte injection hole (11a) and the flow guide hole (11b) are in communication with the mounting space (11c), and an inlet of the electrolyte injection hole (11a) and an outlet of the flow guide hole (11b) are located on two opposite sides of the cover plate body (11) in the direction of the thickness of the cover plate body (11); at least part of the elastic sealing member (12) is arranged in the mounting space (11c) and can elastically deform in an extension direction of the electrolyte injection hole (11a); in a sealed state, an inner wall of the position where the mounting space (11c) is in communication with the electrolyte injection hole (11a) hermetically fits with the elastic sealing member (12), so as to block an outlet of the electrolyte injection hole (11a); and in a communication state, the elastic sealing member (12) is compressed in an extension direction of the electrolyte injection hole (11a) under force, such that the inner wall of the position where the mounting space (11c) is in communication with the electrolyte injection hole (11a) is separated from the elastic sealing member (12). The cover plate assembly (10) is provided with the elastic sealing member (12) in the cover plate body (11), and the elastic sealing member (12) can control, by means of an external force, the opening and closing of the electrolyte injection hole (11a).

Description

Cover plate assembly, battery cell, battery and power-consuming device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on the Chinese patent application with application number 202323595670.6, application date December 27, 2023, and invention name “A cover assembly, battery cell, battery and electrical device”, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this disclosure as a reference. Technical Field

[0003] The embodiments of the present disclosure relate to the field of battery technology, and particularly to a cover assembly, a battery cell, a battery, and an electrical device. Background Art

[0004] In recent years, with the vigorous development of the new energy industry, the battery industry has attracted more and more attention. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in energy storage fields.

[0005] A battery consists of a single cell. Each cell contains an electrolyte, a positive electrode, and a negative electrode. The positive and negative electrodes are immersed in the electrolyte. Active ions, such as lithium ions, are embedded in or extracted from the positive and negative electrodes through the electrolyte, causing electrochemical reactions that enable the cell to charge and discharge.

[0006] During the manufacturing process of the battery cell, electrolyte is injected into the battery cell through the injection hole on the cover plate, and then the injection hole needs to be sealed to prevent leakage of the electrolyte.

[0007] In the related art, the liquid injection hole is generally sealed by driving a sealing nail into the liquid injection hole. However, driving the sealing nail may cause compression and deformation of other structures in the battery cell, and is also not conducive to the subsequent re-activation of the liquid injection hole.

[0008] Summary of the Invention

[0009] In view of this, the embodiments of the present disclosure are intended to provide a cover assembly, a battery cell, a battery, and an electrical device that can repeatedly open, close, and seal a liquid injection hole.

[0010] To achieve the above objectives, the technical solution of the embodiment of the present disclosure is implemented as follows:

[0011] An embodiment of the present disclosure provides a cover plate assembly, the cover plate assembly comprising:

[0012] The cover body is provided with a liquid injection hole, a guide hole and an installation space, wherein the liquid injection hole and the guide hole are both connected to the installation space, and the inlet of the liquid injection hole and the outlet of the guide hole are located on opposite sides of the cover body along the thickness direction thereof;

[0013] an elastic sealing member, at least a portion of which is disposed in the installation space and is elastically deformable along an extension direction of the liquid injection hole;

[0014] The cover plate assembly includes a sealed state and a connected state;

[0015] In the sealed state, the inner wall of the installation space at the position where the installation space communicates with the liquid injection hole is in sealing contact with the elastic sealing member to block the outlet of the liquid injection hole;

[0016] In the connected state, the elastic seal is compressed along the extending direction of the liquid injection hole, so that the inner wall of the connection position between the installation space and the liquid injection hole is separated from the elastic seal.

[0017] The cover plate assembly in the embodiment of the present disclosure is provided with an elastic seal in the cover plate body. The elastic seal can realize the switching between the sealed state and the connected state of the cover plate assembly through the external force, thereby realizing the opening and closing control of the injection hole. On the one hand, in the sealed state, the injection hole is sealed, thereby reducing the probability of foreign matter from the outside entering the battery cell through the injection hole during the subsequent production and use of the battery cell, thereby reducing the probability of the electrolyte leaking from the injection hole to the outside of the battery cell during the movement of the battery cell; on the other hand, during the production and use of the battery cell, the elastic seal can be deformed by applying force to the elastic seal, so that the injection hole and the inside of the battery cell can be re-connected, so that the gas inside the battery cell can be released to the outside of the battery cell, or the electrolyte can be replenished from the outside. At the same time, the injection hole realizes the two functions of exhausting gas and injecting liquid, which is conducive to reducing the number of openings on the cover plate assembly and improving the overall structural strength of the cover plate assembly.

[0018] In some embodiments, the injection hole extends along the thickness direction of the cover body. This facilitates applying a force to the elastic seal from the outside directly along the thickness direction of the cover body through the injection hole to push the elastic seal to compress and deform, thereby reducing the resistance of the inner wall of the injection hole to the force during the application process.

[0019] And / or, the extension direction of the guide hole is perpendicular to the thickness direction of the cover body. In this way, on the one hand, during the injection operation, it is difficult for the electrolyte entering the installation space to directly enter the battery cell along the thickness direction of the cover body, and it is necessary to change the flow direction of the injected electrolyte, thereby reducing the impact of the electrolyte on the components in the battery cell; on the other hand, it also reduces the probability of the electrolyte in the battery cell flowing into the installation space through the guide hole, thereby further reducing the probability of electrolyte leakage.

[0020] In some embodiments, in a projection perpendicular to the extension direction of the liquid injection hole, the projection of the liquid injection hole is located within the projection range of the elastic sealing component, and the projection boundaries of the two are spaced apart.

[0021] In this way, in the sealed state, the elastic seal can completely cover the outlet of the injection hole, and the sealing surface formed between the inner wall of the installation space and the connection position of the injection hole and the elastic seal can be completely arranged on the outside of the outlet boundary of the injection hole, further improving the sealing effect.

[0022] In some embodiments, one of the inner wall of the installation space and the surface of the elastic seal is provided with a positioning rib, and the other is provided with a positioning groove. The positioning rib is embedded in the positioning groove and abuts against the inner wall of the positioning groove perpendicular to the extension direction of the injection hole.

[0023] In this way, through the contact between the positioning ribs and the positioning grooves, the tendency of the elastic seal to move relative to the outlet of the injection hole in a direction perpendicular to the extension direction of the injection hole is suppressed, so that the elastic seal can remain stable relative to the outlet of the injection hole under the action of forces in different directions, reducing the probability of the subsequent elastic seal being unable to seal the injection hole due to slippage of the elastic seal.

[0024] In some embodiments, at least a portion of an outer wall of the elastic sealing member that is perpendicular to the extending direction of the liquid injection hole abuts against an inner wall of the installation space that is perpendicular to the extending direction of the liquid injection hole.

[0025] In this way, the inner wall of the installation space is directly used to limit the relative movement tendency of the elastic seal relative to the outlet of the liquid injection hole in a direction perpendicular to the extension direction of the liquid injection hole, which is conducive to simplifying the structure of the cover assembly.

[0026] In some embodiments, a portion of the elastic seal extends into the liquid injection hole, and in a projection plane perpendicular to the extension direction of the liquid injection hole, the projection of the portion of the elastic seal is located within the projection range of the liquid injection hole.

[0027] In this way, the probability of the elastic seal coming into contact with external objects is reduced, and the probability of the elastic seal coming into contact with other external objects during non-injection operations, thereby causing the elastic seal to be in a connected state, is reduced; at the same time, it is beneficial to avoid the elastic seal protruding from the surface of the cover body where the entrance of the injection hole is provided, thereby ensuring that there are no additional protrusions on the outer contour surface of the battery cell, thereby facilitating the placement and stacking of the battery cells.

[0028] In some embodiments, a side surface of the elastic seal facing the injection hole is provided with an avoidance protrusion, and the avoidance protrusion extends into the injection hole. Along the direction away from the elastic seal, the distance between the side wall of the avoidance protrusion perpendicular to the extension direction of the injection hole and the inner wall of the injection hole gradually increases.

[0029] In this way, in the process of applying force to the elastic seal to compress and deform it, the gap between the avoidance protrusion and the boundary of the outlet of the injection hole can gradually increase, thereby better meeting the flow requirements of the injected electrolyte and reducing the probability of the electrolyte overflowing from the inlet of the injection hole due to filling the injection hole.

[0030] In some embodiments, the connection position between the avoidance protrusion and the elastic seal forms a first arc surface, and the boundary of the outlet of the injection hole forms a second arc surface. In the sealed state, the first arc surface and the second arc surface are sealed and fitted.

[0031] In this way, on the one hand, the area of ​​the region where the elastic seal achieves sealing contact in the sealed state is increased, thereby improving the sealing effect. On the other hand, the surface of the elastic seal that achieves sealing is bent and extended, thereby further improving the sealing effect.

[0032] In some embodiments, the cover assembly further includes a pressure rod, which is detachably inserted into the avoidance protrusion, and the pressure rod passes through the liquid injection hole and extends out of the entrance of the liquid injection hole.

[0033] In this way, it is convenient to use a tool to apply force to the pressure rod to indirectly apply force to the elastic seal, thereby facilitating deformation of the elastic seal and reducing the probability of damage to the elastic seal caused by direct contact of the tool with the elastic seal.

[0034] In some embodiments, the elastic seal includes an elastomer and a sealing ring, the elastomer is located in the installation space and can be elastically deformed along the extension direction of the injection hole, the sealing ring is provided on the side surface of the elastomer facing the injection hole to seal with the inner wall connecting the installation space and the injection hole, in the projection plane perpendicular to the extension direction of the injection hole, the projection of the injection hole is located on the inner side of the projection of the sealing ring, and the elastic modulus of the elastomer is greater than the elastic modulus of the sealing ring.

[0035] In this way, the sealing ring can achieve a better sealing effect than the elastomer; at the same time, the elastomer can be more easily deformed than the sealing ring to achieve the conversion between the sealing state and the connecting state.

[0036] In some embodiments, the cover body includes an upper cover and a lower cover, the upper cover and the lower cover are fitted together along the thickness direction of the upper cover, the injection hole passes through the upper cover along the thickness direction of the upper cover, a portion of the lower cover protrudes away from the upper cover to form a mounting protrusion, the guide hole is provided in the mounting protrusion, a receiving cavity is provided in the mounting protrusion, the receiving cavity is open toward one side of the upper cover to form an opening, the upper cover is provided on the opening to enclose the lower cover to form the installation space, the elastic seal can be sealed and fitted with or separated from the upper cover, and on the projection surface perpendicular to the thickness direction of the upper cover, the projection of the elastic seal is located within the range of the opening.

[0037] This helps to simplify the assembly steps and structure of the cover assembly, facilitates manufacturing and assembly, and improves production efficiency.

[0038] In some embodiments, the accommodating cavity includes a first sub-cavity and a second sub-cavity, the first sub-cavity is located on a side of the second sub-cavity close to the upper cover, the opening is provided on a side of the first sub-cavity away from the second sub-cavity, the first sub-cavity extends along the extension direction of the injection hole, and on a projection plane perpendicular to the thickness direction of the upper cover, the projection of the first sub-cavity is located within the projection range of the second sub-cavity, and at least a portion of the side wall of the elastic seal perpendicular to the extension direction of the injection hole abuts against the side wall of the first sub-cavity.

[0039] In this way, the side wall of the first sub-cavity perpendicular to the extending direction of the liquid injection hole limits the movement tendency of the elastic sealing member relative to the outlet of the liquid injection hole in the extending direction perpendicular to the liquid injection hole.

[0040] In some embodiments, at least one pair of positioning ribs is provided on the inner wall of the accommodating cavity away from the opening, and the positioning ribs extend perpendicularly to the thickness direction of the upper cover, and two of the positioning ribs in a pair are spaced apart along their extension direction. At least one pair of positioning grooves is provided at one end of the elastic seal away from the opening, and two of the positioning grooves in a pair are respectively provided on opposite sides of the elastic seal perpendicular to the thickness direction of the upper cover. The positioning grooves are open on the side away from the opening and on the side away from the other positioning groove, and the positioning ribs can be embedded in the positioning groove along the extension direction of the liquid injection hole and fit with the inner wall of the positioning groove.

[0041] In this way, in the process of installing the elastic seal into the accommodating cavity, the positioning edge can be directly embedded in the positioning groove, which facilitates the positioning of the elastic seal at the preset installation position where the injection hole needs to be sealed, thereby simplifying the installation, positioning and fixing steps of the elastic seal and improving the assembly efficiency; at the same time, the side wall of the positioning groove is used to constrain the elastic seal in two mutually perpendicular directions on the plane perpendicular to the extension direction of the injection hole, thereby better fixing the elastic seal.

[0042] An embodiment of the present disclosure also provides a battery cell, which includes a shell, an electrode assembly and the cover plate assembly of any one of the aforementioned embodiments, wherein an installation cavity is provided in the shell, one side of the installation cavity is open to form an installation opening, the electrode assembly is arranged in the installation cavity, the cover plate assembly is covered on the installation opening, and the guide hole connects the installation space and the installation cavity.

[0043] In this way, by switching between the sealed state and the connected state, it is suitable for opening and closing the injection hole in multiple processes such as helium inspection, vacuum baking, injection, formation, and aging in the production of battery cells, which expands the use scenarios, improves production efficiency, and facilitates the subsequent replenishment of electrolyte to the battery cells.

[0044] An embodiment of the present disclosure further provides a battery, which includes several battery cells as described in the aforementioned embodiments.

[0045] In this way, by controlling the opening and closing of the liquid injection hole, it is convenient to replenish the electrolyte into the battery cells in the battery, which is beneficial to extending the service life of the battery.

[0046] An embodiment of the present disclosure further provides an electrical device, which includes the battery described in the aforementioned embodiment, and the battery is used as a power source for the electrical device.

[0047] In this way, by controlling the opening and closing of the liquid injection hole, it is convenient to replenish the electrolyte into the battery cells in the battery, which is beneficial to extending the service life of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] FIG1 is a schematic diagram of an embodiment of the present disclosure in which the electric device is a vehicle;

[0049] FIG2 is a schematic diagram of a battery in one embodiment of the present disclosure;

[0050] FIG3 is a schematic diagram of a battery cell in an embodiment of the present disclosure;

[0051] FIG4 is a schematic diagram of a cover plate assembly in the first embodiment of the present disclosure;

[0052] FIG5 is a schematic cross-sectional view of FIG4 at position AA;

[0053] FIG6 is a partial enlarged schematic diagram of the cover plate assembly in a sealed state at position C in FIG5 according to an embodiment of the present disclosure;

[0054] FIG7 is a partial enlarged schematic diagram of the cover plate assembly in a connected state at position C in FIG5 according to one embodiment of the present disclosure;

[0055] FIG8 is a cross-sectional view of FIG4 at position BB;

[0056] FIG9 is a partial enlarged schematic diagram of the same position as FIG7 , showing the cover plate assembly in a connected state in the second embodiment of the present disclosure;

[0057] FIG10 is a partial enlarged schematic diagram of the same position as FIG7 in the third embodiment of the present disclosure, in a connected state of the cover plate assembly;

[0058] FIG11 is a schematic diagram of an elastic seal in one embodiment of the present disclosure.

[0059] Explanation of the reference numerals: 1000, vehicle; 100, battery; 200, controller; 300, motor; 101, bottom cover; 102, top cover; 103, battery cell; 10, cover assembly; 11, cover body; 11a, liquid injection hole; 11b, guide hole; 11c, installation space; 11d, second curved surface; 111, upper cover; 112, lower cover; 112a, accommodating cavity; 112b, opening; 112c, first sub-cavity; 112d, second sub-cavity; 1121, installation protrusion; 1122, positioning ridge; 12, elastic sealing member; 12a, positioning groove; 12b, first curved surface; 121, avoidance protrusion; 122, sealing ring; 123, elastomer; 13, pressure rod; 14, electrode column; 20, shell; 20a, installation cavity; 20b, installation opening; 30, electrode assembly. DETAILED DESCRIPTION

[0060] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of the present disclosure can be combined with each other, and the detailed description in the specific implementation methods should be understood as an explanation of the purpose of the present disclosure and should not be regarded as an improper limitation on the present disclosure.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which the present disclosure belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the terms "including" and "having" and any variations thereof in the specification of the present disclosure and the above-mentioned drawings are intended to cover non-exclusive inclusions.

[0062] In the description of the embodiments of the present disclosure, technical terms such as "first," "second," and "third" are used solely to distinguish different objects and should not be understood to indicate or imply relative importance or to implicitly specify the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0063] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0064] In the description of the embodiments of the present disclosure, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0065] In the description of the embodiment of the present disclosure, for the convenience of explanation, as shown in FIG5 , the direction of the arrow X is referred to as the “thickness direction of the cover body” and the “thickness direction of the upper cover”.

[0066] In the description of the embodiments of the present disclosure, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal connectivity between two components or interaction between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure based on specific circumstances.

[0067] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0068] Batteries are increasingly used in everyday life and industry. They are not only used in energy storage systems like hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. As battery applications continue to expand, market demand is also growing.

[0069] Figure 2 is a perspective exploded schematic diagram of a battery 100 provided in an embodiment of the present disclosure. As shown in Figure 2, the battery 100 includes a bottom cover 101, a top cover 102, and at least one battery cell 103. The top cover 102 covers the bottom cover 101, thereby forming a storage space for the battery cell 103 between the bottom cover 101 and the top cover 102.

[0070] In the battery 100, there may be multiple battery cells 103, and the multiple battery cells 103 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 103. The multiple battery cells 103 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 103 structure may be placed in the storage space formed by the bottom cover 101 and the top cover 102. Of course, the battery 100 may also be a battery module formed by first connecting the multiple battery cells 103 in series, in parallel, or in a hybrid connection, and then the multiple battery modules may be connected in series, in parallel, or in a hybrid connection to form an entire battery cell, and then housed in the storage space formed by the bottom cover 101 and the top cover 102. The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component for achieving electrical connection between the multiple battery cells 103.

[0071] Referring to Figure 3, the battery cell 103 involved in the embodiments of the present disclosure includes an electrode assembly 30 and an electrolyte. The electrode assembly 30 is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell 103 primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode current collector. The current collector uncoated with the positive active material layer protrudes from the current collector coated with the positive active material layer. The current collectors uncoated with the positive active material layer, after being stacked, serve as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode current collector. The current collector uncoated with the negative active material layer protrudes from the current collector coated with the negative active material layer. The current collectors uncoated with the negative active material layer, after being stacked, serve as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material can be carbon or silicon. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). Furthermore, the electrode assembly 30 can be a wound or laminated structure.

[0072] The battery cell 103 may be a secondary battery. A secondary battery refers to a battery cell 103 that can be continuously used by activating active materials by charging after the battery cell 103 is discharged.

[0073] The battery cell 103 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present disclosure.

[0074] The battery cell 103 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or other shapes. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal batteries. Polygonal batteries are, for example, hexagonal batteries, etc. There is no special limitation in the embodiments of the present disclosure.

[0075] The battery 100 referred to in the embodiments of the present disclosure refers to a single physical module including one or more battery cells 103 to provide higher voltage and capacity.

[0076] The electrical devices involved in the embodiments of the present disclosure are powered by the above-mentioned batteries, and the electrical devices may be, but are not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery-powered vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0077] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present disclosure is taken as an example of a vehicle 1000. The following description is made with reference to the accompanying drawings.

[0078] FIG1 is a schematic structural diagram of a vehicle 1000 provided in an embodiment of the present disclosure. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. As shown in FIG1 , a battery 100 is provided inside the vehicle 1000. The battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle 1000 during driving.

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

[0080] The following describes the embodiments of the present disclosure in detail.

[0081] In related technologies, a battery cell is equipped with a housing and a cover assembly. The electrode assembly is placed into the housing through the opening, and the housing opening is then sealed with the cover assembly. Electrolyte is then injected into the housing through the injection hole in the cover assembly. After the electrode assembly is fully submerged in the electrolyte, the injection hole is sealed to prevent leakage.

[0082] To seal the injection hole, the related art typically drives a sealing nail directly into the hole, creating an interference fit between the nail and the inner wall of the hole. However, the impact of the nail during insertion and the compression of the nail against the inner wall of the hole can easily cause deformation of the cover plate assembly, affecting the structural strength of the battery cell. Furthermore, the difficulty in removing the nail makes it difficult to replenish the electrolyte after the battery cell has been used for a period of time.

[0083] At the same time, after the structural assembly is completed, the battery cells need to undergo a formation treatment. The formation treatment is to perform the first low-current charging on the assembled battery cells to ensure that the electrolyte and electrode assembly in the battery cells can function normally in subsequent battery cells. During the formation treatment, the electrochemical reaction between the electrode assembly and the electrolyte inside the housing will produce gas, which will adversely affect the effectiveness of the formation treatment. Therefore, after the formation treatment, the issue of gas discharge from the battery cells also needs to be considered.

[0084] The present disclosure provides a cover plate assembly, as well as a battery cell, a battery, and an electrical device having the cover plate assembly. The cover plate assembly includes an elastic seal that is elastically deformable along the extension direction of the liquid injection hole. This elastic seal can be squeezed and released to seal the outlet of the liquid injection hole, thereby opening and closing the liquid injection hole.

[0085] Specifically, referring to FIG. 4 to FIG. 8 , an embodiment of the present disclosure provides a cover plate assembly 10 for a battery cell 103 . The cover plate assembly 10 includes a cover plate body 11 and an elastic sealing member 12 .

[0086] The cover body 11 is provided with a liquid injection hole 11a, a flow guide hole 11b, and an installation space 11c. The liquid injection hole 11a and the flow guide hole 11b are both connected to the installation space 11c. The inlet of the liquid injection hole 11a and the outlet of the flow guide hole 11b are located on opposite sides of the cover body 11 along its thickness direction.

[0087] At least a portion of the elastic sealing member 12 is disposed in the installation space 11 c and is capable of elastically deforming along the extension direction of the liquid injection hole 11 a ;

[0088] The cover assembly 10 includes a sealed state and a communicating state;

[0089] In the sealed state, the inner wall of the installation space 11c at the position where it communicates with the injection hole 11a is sealed with the elastic sealing member 12 to block the outlet of the injection hole 11a;

[0090] In the connected state, the elastic seal 12 is compressed along the extending direction of the liquid injection hole 11 a so that the inner wall of the connection position between the installation space 11 c and the liquid injection hole 11 a is separated from the elastic seal 12 .

[0091] The injection hole 11 a can connect the interior of the battery cell 103 with the outside, and is used to provide a channel for external electrolyte to enter the battery cell 103 .

[0092] The installation space 11 c is used to accommodate the elastic sealing member 12 .

[0093] It can be understood that the outlet of the injection hole 11a is connected to the installation space 11c, and the inlet of the guide hole 11b is connected to the installation space 11c, so that the electrolyte can enter from the inlet of the injection hole 11a located on one side of the cover body 11 along its thickness direction, and pass through the injection hole 11a, the installation space 11c and the guide hole 11b in sequence, and flow out from the outlet of the guide hole 11b located on the other side of the cover body 11 along its thickness direction.

[0094] The elastic seal 12 can abut against the inner wall of the installation space 11c on the side away from the injection hole 11a along the extension direction of the injection hole 11a, so that the elastic seal 12 can stretch toward the outlet of the injection hole 11a or shrink away from the outlet of the injection hole 11a through elastic deformation.

[0095] The inner wall at the position where the installation space 11 c communicates with the liquid injection hole 11 a refers to a portion of the inner wall of the installation space 11 c where the outlet of the liquid injection hole 11 a is provided.

[0096] The sealed state, as shown in Figure 6, refers to the state in which the elastic seal 12 is not subjected to external forces. In this state, the elastic seal 12 naturally stretches along the extension direction of the injection hole 11a until it abuts the inner wall of the connection point between the installation space 11c and the injection hole 11a, thereby completely covering the outlet of the injection hole 11a along the extension direction of the injection hole 11a. The elastic seal 12 is in sealed contact with the inner wall of the installation space 11c, isolating the installation space 11c from the injection hole 11a. Even if electrolyte enters the installation space 11c, it cannot enter the injection hole 11a due to the obstruction of the elastic seal 12.

[0097] It can be understood that, in the sealed state, the elastic sealing member 12 is constrained by the inner walls on both sides of the installation space 11 c along the extension direction of the liquid injection hole 11 a and is in a state of force compression to maintain a sealed fit.

[0098] The connected state, as shown in FIG7 , refers to a state in which an external force is applied to the elastic seal 12 from the side of the cover assembly 10 where the inlet of the liquid injection hole 11a is provided along its thickness, causing the elastic seal 12 to be further compressed. In this state, the end surface of the elastic seal 12 on the side closest to the liquid injection hole 11a moves away from the liquid injection hole 11a along the extension direction of the liquid injection hole 11a, thereby separating the elastic seal 12 from the inner wall of the connection point between the installation space 11c and the liquid injection hole 11a, and creating a gap connecting the installation space 11c and the liquid injection hole 11a. As a result, the elastic seal 12 no longer blocks the liquid injection hole 11a, and the liquid injection hole 11a, the installation space 11c, and the diversion hole 11b are connected.

[0099] In the embodiment of the present disclosure, the cover plate assembly 10 is provided with an elastic seal 12 within the cover plate body 11. The elastic seal 12 can be switched between a sealed state and a connected state by external forces, thereby controlling the opening and closing of the injection hole 11a. On the one hand, in the sealed state, the injection hole 11a is sealed, thereby reducing the probability of foreign matter from entering the battery cell 103 through the injection hole 11a during subsequent production and use, thereby adversely affecting the normal operation of the battery cell 103. At the same time, the probability of electrolyte leakage from the injection hole 11a to the outside of the battery cell 103 during movement of the battery cell 103 is also reduced. On the other hand, during the production and use of the battery cell 103, the elastic seal 12 can be deformed by applying force to the elastic seal 12, thereby restoring communication between the injection hole 11a and the interior of the battery cell 103, allowing gas inside the battery cell 103 to be released to the outside of the battery cell 103, or replenishing electrolyte from the outside. At the same time, the liquid injection hole 11 a can realize the dual functions of exhausting gas and injecting liquid, which is beneficial to reducing the number of openings on the cover plate assembly 10 and improving the overall structural strength of the cover plate assembly 10 .

[0100] The number of the liquid injection holes 11 a correspondingly arranged to communicate with the installation space 11 c is not limited, and can be one or more.

[0101] The number of the guide holes 11 b corresponding to and communicating with the installation space 11 c is not limited, and can be one or more.

[0102] The number of installation spaces 11c is not limited and can be one or more.

[0103] The source of the external force that drives the elastic seal 12 to undergo elastic deformation is not limited, such as the impact force of the electrolyte itself, the squeezing force applied to the elastic seal 12 by an external tool, etc.

[0104] It is understandable that the structure of the liquid injection hole 11 a needs to facilitate the application of force to the elastic sealing member 12 .

[0105] For example, referring to Figures 4 to 7, the injection hole 11a extends along the thickness direction of the cover body 11. In this way, it is convenient to apply a force to the elastic seal 12 from the outside directly through the injection hole 11a along the thickness direction of the cover body 11 to promote the elastic seal 12 to undergo compression deformation, thereby reducing the obstruction of the inner wall of the injection hole 11a to the force during the application process.

[0106] It is understandable that during the injection process of the electrolyte into the battery cell 103 , the injected electrolyte has a certain impact force due to the pressure, and it is necessary to reduce the impact of the electrolyte on the components inside the battery cell 103 .

[0107] Specifically, referring to FIG. 4 and FIG. 8 , the extension direction of the air guide hole 11 b is perpendicular to the thickness direction of the cover plate body 11 .

[0108] In this way, on the one hand, during the injection operation, it is difficult for the electrolyte entering the installation space 11c to directly enter the battery cell 103 along the thickness direction of the cover body 11, and it is necessary to change the flow direction of the injected electrolyte, thereby reducing the impact of the electrolyte on the components in the battery cell 103; on the other hand, it also reduces the probability of the electrolyte in the battery cell 103 flowing into the installation space 11c through the guide hole 11b, thereby further reducing the probability of electrolyte leakage.

[0109] In some embodiments, referring to FIG. 5 to FIG. 7 , in a projection perpendicular to the extending direction of the liquid injection hole 11 a , the projection of the liquid injection hole 11 a is located within the projection range of the elastic sealing member 12 , and the projection boundaries of the two are spaced apart.

[0110] In this way, in the sealed state, the elastic seal 12 can completely cover the outlet of the liquid injection hole 11a, and the sealing surface formed between the inner wall of the connection position between the installation space 11c and the liquid injection hole 11a and the elastic seal 12 can be completely arranged on the outside of the outlet boundary of the liquid injection hole 11a, further improving the sealing effect.

[0111] The cross-sectional shape of the injection hole 11a perpendicular to its extending direction is not limited, for example, circular, polygonal, etc.

[0112] In some embodiments, the cross-sectional shape of the elastic seal 12 perpendicular to the extension direction of the injection hole 11a is the same as the cross-sectional shape of the injection hole 11a perpendicular to its extension direction, so as to facilitate meeting the sealing effect while reducing the size of the elastic seal 12 and making the structure of the cover assembly 10 more compact.

[0113] It is understandable that during the liquid injection operation, due to changes in the magnitude and direction of the impact force of the electrolyte, the direction and magnitude of the force acting on the elastic seal 12 will also change, which may cause the position of the elastic seal 12 in the installation space 11c to change, and then cause the subsequent elastic seal 12 to be unable to seal the liquid injection hole 11a.

[0114] In some embodiments, referring to Figures 6 and 7, one of the inner wall of the installation space 11c and the surface of the elastic seal 12 is provided with a positioning rib 1122, and the other is provided with a positioning groove 12a. The positioning rib 1122 is embedded in the positioning groove 12a and abuts against the inner wall of the positioning groove 12a perpendicular to the extension direction of the liquid injection hole 11a.

[0115] In this way, through the contact between the positioning rib 1122 and the positioning groove 12a, the movement tendency of the elastic seal 12 relative to the outlet of the injection hole 11a in the extension direction perpendicular to the injection hole 11a is suppressed, so that the elastic seal 12 can remain stable relative to the outlet of the injection hole 11a under the action of forces in different directions, reducing the probability that the elastic seal 12 will slip and cause the subsequent elastic seal 12 to fail to block the injection hole 11a.

[0116] In some embodiments, referring to FIG. 9 , at least a portion of the outer wall of the elastic sealing member 12 perpendicular to the extending direction of the liquid injection hole 11 a abuts against the inner wall of the installation space 11 c perpendicular to the extending direction of the liquid injection hole 11 a .

[0117] In this way, the inner wall of the installation space 11c is directly used to limit the relative movement tendency of the elastic seal 12 relative to the outlet of the injection hole 11a in the extension direction perpendicular to the injection hole 11a, which is conducive to simplifying the structure of the cover assembly 10.

[0118] It can be understood that the portion of the elastic sealing member 12 that blocks the liquid injection hole 11 a is exposed to the outside world, and thus there is a possibility of contact with external objects.

[0119] In some embodiments, a portion of the elastic seal 12 extends into the injection hole 11a, and in a projection plane perpendicular to the extension direction of the injection hole 11a, the projection of this portion of the elastic seal 12 is located within the projection range of the injection hole 11a.

[0120] That is, the elastic sealing member 12 does not extend beyond the entrance of the liquid injection hole 11 a .

[0121] In this way, the probability of the elastic seal 12 coming into contact with external objects is reduced, and the probability of the elastic seal 12 coming into contact with other external objects during non-injection operations, thereby causing the elastic seal 12 to be in a connected state, is reduced; at the same time, it is beneficial to avoid the elastic seal 12 protruding from the surface of the entrance of the cover body 11 where the injection hole 11a is provided, thereby ensuring that the outer contour surface of the battery cell 103 has no additional protrusions, thereby facilitating the placement and stacking of the battery cell 103.

[0122] After the injection operation is completed, the cover assembly 10 switches to a sealed state, and the elastic seal 12 extending into the injection hole 11a can occupy a part of the volume of the injection hole 11a, thereby reducing the probability of electrolyte remaining in the injection hole 11a, facilitating the cleaning of residual electrolyte, and reducing the probability of electrolyte contamination and corrosion of the cover assembly 10.

[0123] In some embodiments, referring to Figure 9, a side surface of the elastic seal 12 facing the injection hole 11a is provided with an avoidance protrusion 121, which extends into the injection hole 11a. In other words, the avoidance protrusion 121 forms the portion of the elastic seal 12 extending into the injection hole 11a.

[0124] In some embodiments, the avoidance protrusion 121 is perpendicular to at least a portion of the outer wall of the liquid injection hole 11 a in the extending direction, and is spaced apart from the inner wall of the liquid injection hole 11 a .

[0125] This helps reduce or even eliminate the friction between the avoidance protrusion 121 and the inner wall of the liquid injection hole 11 a, thereby helping reduce the force required to convert the cover assembly 10 from the sealed state to the connected state.

[0126] In some embodiments, referring to FIG. 9 , the distance between the sidewall of the relief protrusion 121 perpendicular to the extending direction of the liquid injection hole 11a and the inner wall of the liquid injection hole 11a gradually increases as the distance moves away from the elastic seal 12. In other words, the sidewall of the relief protrusion 121 perpendicular to the extending direction of the liquid injection hole 11a is inclined toward the inner wall of the liquid injection hole 11a.

[0127] In this way, when a force is applied to the elastic seal 12 to compress and deform it, the gap between the avoidance protrusion 121 and the boundary of the outlet of the injection hole 11a can gradually increase, thereby better meeting the flow requirements of the injected electrolyte and reducing the probability of the electrolyte overflowing from the inlet of the injection hole 11a due to filling the injection hole 11a.

[0128] The specific shape of the avoidance protrusion 121 is not limited, for example, a cone, a truncated cone, a pyramid, a truncated pyramid, etc.

[0129] In some embodiments, referring to FIG. 9 , the connection position between the avoidance protrusion 121 and the elastic seal 12 forms a first arc surface 12b, and the boundary of the outlet of the injection hole 11a forms a second arc surface 11d. In the sealed state, the first arc surface 12b and the second arc surface 11d are sealed and fitted together.

[0130] In this way, on the one hand, the area of ​​the region where the elastic seal 12 achieves sealing contact in the sealed state is increased, thereby improving the sealing effect. On the other hand, the surface of the elastic seal 12 that achieves sealing is bent and extended, thereby further improving the sealing effect.

[0131] It is understandable that additional auxiliary structures may be provided to facilitate applying force to the elastic sealing member 12 to cause deformation.

[0132] Exemplarily, referring to FIG. 10 , the cover assembly 10 further includes a pressing rod 13 , which is detachably inserted into the elastic sealing member 12 . The pressing rod 13 passes through the liquid injection hole 11 a and extends out of the entrance of the liquid injection hole 11 a .

[0133] Since the pressure rod 13 extends out of the entrance of the liquid injection port, it is convenient to use a tool to apply a force to the pressure rod 13 to indirectly apply a force to the elastic seal 12, thereby facilitating the deformation of the elastic seal 12 and reducing the chance of damage to the elastic seal 12 caused by direct contact of the tool with the elastic seal 12.

[0134] The specific method for achieving the detachable connection between the pressure rod 13 and the elastic sealing member 12 is not limited.

[0135] For example, the elastic sealing member 12 is provided in the threaded hole, and a thread is provided on the surface of the pressing rod 13 so that the pressing rod 13 is threadedly matched with the threaded hole.

[0136] In some embodiments, referring to Figure 10, the pressure rod 13 is detachably inserted into the avoidance protrusion 121. In this way, a larger contact area can be provided between the pressure rod 13 and the elastic seal 12, so that the elastic seal 12 can remain intact under a greater force.

[0137] The specific composition of the elastic sealing member 12 is not limited.

[0138] In some embodiments, referring to Figure 10, the elastic seal 12 includes an elastomer 123 and a sealing ring 122. The elastomer 123 is located in the installation space 11c and can be elastically deformed along the extension direction of the injection hole 11a. The sealing ring 122 is arranged on the side surface of the elastomer 123 facing the injection hole 11a to seal and fit with the inner wall connecting the installation space 11c and the injection hole 11a. In the projection plane perpendicular to the extension direction of the injection hole 11a, the projection of the injection hole 11a is located within the projection range of the sealing ring 122, and the elastic modulus of the elastomer 123 is greater than the elastic modulus of the sealing ring 122.

[0139] Elastic modulus refers to the proportional relationship between stress and strain in a material during its elastic deformation phase. The elastic modulus of the elastomer 123 is greater than that of the sealing ring 122, meaning that under the same applied force, the elastomer 123 is more easily deformed than the sealing ring 122.

[0140] That is, during the elastic deformation of the elastic seal 12, the deformation is primarily caused by the force exerted on the elastic body 123, and the sealing ring 122 primarily performs a sealing function. The elastic body 123 can drive the position of the sealing ring 122 to change, so that the sealing ring 122 abuts or separates from the inner wall of the installation space 11c, thereby achieving the purpose of switching the cover assembly 10 between the sealed state and the connected state.

[0141] In this way, the sealing ring 122 can achieve a better sealing effect than the elastic body 123; at the same time, the elastic body 123 can be more easily deformed than the sealing ring 122 to achieve the conversion between the sealing state and the connecting state.

[0142] It is understandable that the sealing ring 122 can be made of standard parts to reduce manufacturing costs.

[0143] The elastic body 123 and the sealing ring 122 are fixedly connected. For example, a mounting groove is provided on the surface of the elastic body 123 facing the liquid injection hole 11 a , and the sealing ring 122 is embedded in the mounting groove and bonded to the sealing groove.

[0144] It is understandable that the external force acts on the elastic body 123 through the inner side of the sealing ring 122 to deform the elastic body 123 .

[0145] The specific shape of the elastic body 123 is not limited, such as a cylinder, a prism, etc.

[0146] 9 , in the embodiment with the avoidance protrusion 121 , the avoidance protrusion 121 is located inside the sealing ring 122 .

[0147] In some embodiments, in the projection plane perpendicular to the extension direction of the injection hole 11a, the projection of the injection hole 11a is located on the inner side of the projection of the sealing ring 122, so as to reduce the probability of the tool causing damage to the sealing ring 122 when applying force to the elastic seal 12 through the tool.

[0148] The specific material of the elastic body 123 is not limited, for example, EPDM rubber, etc.

[0149] The specific structure of the cover body 11 facilitates the installation of the elastic sealing member 12 .

[0150] For example, referring to Figures 6, 7, 9 and 10, the cover body 11 includes an upper cover 111 and a lower cover 112. The upper cover 111 and the lower cover 112 are fitted together along the thickness direction of the upper cover 111. The liquid injection hole 11a penetrates the upper cover 111 along the thickness direction of the upper cover 111. A part of the lower cover 112 protrudes in the direction away from the upper cover 111 to form a mounting protrusion 1121. The guide hole 11b is provided on the mounting protrusion 1121. An accommodating cavity 112a is provided in the mounting protrusion 1121. The accommodating cavity 112a is open to one side of the upper cover 111 to form an opening 112b. The upper cover 111 is covered on the opening 112b to form an installation space 11c with the lower cover 112. The elastic seal 12 can be sealed and fitted with or separated from the upper cover 111. On the projection surface perpendicular to the thickness direction of the upper cover 111, the projection of the elastic seal 12 is located within the range of the opening 112b.

[0151] During the assembly of the cover assembly 10, the elastic seal 12 can be first installed into the accommodating cavity 112a through the opening 112b, and then the upper cover 111 and the lower cover 112 are fitted together along the thickness direction of the upper cover 111 so that the upper cover 111 covers the opening 112b and the injection hole 11a is connected to the accommodating cavity 112a. At the same time, the elastic seal 12 is squeezed by the upper cover 111 and the lower cover 112 so that the elastic seal 12 blocks the injection hole 11a.

[0152] This helps to simplify the assembly steps and structure of the cover assembly 10, facilitates manufacturing and assembly, and improves production efficiency.

[0153] It can be understood that, when the upper cover 111 and the lower cover 112 are in a state of being in contact with each other, the distance between the inner wall of the accommodating cavity 112a on the side away from the opening 112b and the upper cover 111 is smaller than the distance of the elastic seal 12 along the extension direction of the injection hole 11a in the natural state, so that the elastic seal 12 is in a compressed state in the state, so that the elastic seal 12 can block the injection hole 11a.

[0154] The thickness direction of the upper cover 111, the thickness direction of the cover body 11 and the extending direction of the liquid injection hole 11a are all in the same direction.

[0155] There is no limitation on the specific method of achieving the fitting and fixing of the upper cover 111 and the lower cover 112 , such as bonding, welding, etc.

[0156] In some embodiments, referring to FIG. 8 , the inlet of the guide hole 11b is disposed on the side wall of the accommodating cavity 112a perpendicular to the thickness direction of the upper cover 111 , and the outlet of the guide hole 11b is disposed on the outer side wall of the mounting protrusion 1121 perpendicular to the thickness direction of the upper cover 111 .

[0157] The specific structural form of the accommodating cavity 112a is not limited.

[0158] Exemplarily, referring to Figure 9, the accommodating chamber 112a includes a first sub-cavity 112c and a second sub-cavity 112d. The first sub-cavity 112c is located on the side of the second sub-cavity 112d close to the upper cover 111, and the side of the first sub-cavity 112c away from the second sub-cavity 112d is provided with an opening 112b. The first sub-cavity 112c extends along the extension direction of the injection hole 11a. On the projection plane perpendicular to the thickness direction of the upper cover 111, the projection of the first sub-cavity 112c is located within the projection range of the second sub-cavity 112d, and at least a portion of the side wall of the elastic seal 12 perpendicular to the extension direction of the injection hole 11a abuts against the side wall of the first sub-cavity 112c.

[0159] In this way, the side wall of the first sub-cavity 112c perpendicular to the extending direction of the liquid injection hole 11a limits the movement tendency of the elastic sealing member 12 relative to the outlet of the liquid injection hole 11a in the extending direction perpendicular to the liquid injection hole 11a.

[0160] It can be understood that, on a projection plane perpendicular to the thickness direction of the upper cover 111 , the projection of the elastic sealing member 12 is located within the projection range of the first sub-cavity 112 c .

[0161] It can be understood that the guide hole 11b can be connected to at least one of the first sub-cavity 112c and the second sub-cavity 112d.

[0162] In some embodiments, in the extension direction perpendicular to the injection hole 11a, the cross-sectional shape of the first sub-cavity 112c is the same as the cross-sectional shape of the elastic seal 12. In this way, the elastic seal 12 can be abutted by the inner wall of the first sub-cavity 112c in any direction perpendicular to the extension direction of the injection hole 11a, thereby better suppressing the relative movement tendency of the elastic seal 12.

[0163] In the embodiment with positioning ribs 1122 and positioning grooves 12a, referring to Figures 6, 7, 9 to 11, at least one pair of positioning ribs 1122 is provided on the inner wall of the accommodating chamber 112a away from the opening 112b, and the positioning ribs 1122 extend perpendicularly to the thickness direction of the upper cover 111. The two positioning ribs 1122 in a pair are spaced apart along their extension direction, and at least one pair of positioning grooves 12a is provided at one end of the elastic seal 12 away from the opening 112b. The two positioning grooves 12a in a pair are respectively provided on opposite sides of the elastic seal 12 perpendicular to the thickness direction of the upper cover 111. The side of the positioning groove 12a away from the opening 112b and the side away from the other positioning groove 12a are open, and the positioning rib 1122 can be embedded in the positioning groove 12a along the extension direction of the liquid injection hole 11a and fit against the inner wall of the positioning groove 12a.

[0164] In this way, in the process of installing the elastic seal 12 into the accommodating cavity 112a, the positioning rib 1122 can be directly embedded in the positioning groove 12a, which facilitates the positioning of the elastic seal 12 at the preset installation position where the injection hole 11a needs to be sealed, thereby simplifying the installation, positioning, and fixing steps of the elastic seal 12 and improving the assembly efficiency; at the same time, the side wall of the positioning groove 12a is used to constrain the elastic seal 12 in two mutually perpendicular directions on the plane perpendicular to the extension direction of the injection hole 11a, thereby better fixing the elastic seal 12.

[0165] It is understandable that the number of pairs of positioning ribs 1122 and the number of pairs of positioning grooves 12a may be the same or different.

[0166] In the embodiment where there are multiple pairs of positioning ribs 1122 , the multiple pairs of positioning ribs 1122 are circumferentially spaced apart along an axis parallel to the extending direction of the liquid injection hole 11 a .

[0167] In the embodiment where there are multiple pairs of positioning grooves 12 a , the multiple pairs of positioning grooves 12 a are circumferentially spaced apart along an axis parallel to the extending direction of the liquid injection hole 11 a .

[0168] It can be understood that there is an interference fit between the inner wall of the positioning groove 12 a and the positioning rib 1122 .

[0169] 6 , 7 , 9 and 10 , the positioning rib 1122 is disposed in the second sub-cavity 112 d .

[0170] 6 , 7 , 9 and 10 , the positioning groove 12 a is provided on the elastic body 123 .

[0171] Referring to FIG10 , a specific embodiment of the cover plate assembly 10 in the present disclosure is as follows:

[0172] The cover assembly 10 includes an elastic pressure rod 13, a sealing member and a cover body 11. The cover body 11 includes an upper cover 111 and a lower cover 112. The elastic sealing member 12 includes an elastic body 123 and a sealing ring 122. The upper cover 111 and the lower cover 112 are fitted together along the thickness direction of the upper cover 111. The injection hole 11a passes through the upper cover 111 along the thickness direction of the upper cover 111. A portion of the lower cover 112 protrudes in a direction away from the upper cover 111 to form a mounting protrusion 1121. The guide hole 11b is provided in the mounting protrusion 1121. The mounting protrusion 1121 is provided with a receiving cavity 112a. The receiving cavity 112a is open to one side of the upper cover 111 to form an opening 112. b. The upper cover 111 is covered on the opening 112b to form an installation space 11c with the lower cover 112. On the projection surface perpendicular to the thickness direction of the upper cover 111, the projection of the elastic seal 12 is located within the range of the opening 112b; the extension direction of the guide hole 11b is perpendicular to the thickness direction of the upper cover 111, and the side surface of the elastic body 123 facing the injection hole 11a is provided with an avoidance protrusion 121, which extends into the injection hole 11a. Along the direction away from the elastic seal 12, the distance between the side wall of the avoidance protrusion 121 perpendicular to the extension direction of the injection hole 11a and the inner wall of the injection hole 11a gradually increases; the pressure rod 13 is detachably inserted into In the avoidance protrusion 121, the pressure rod 13 passes through the injection hole 11a and extends out of the entrance of the injection hole 11a; the elastic body 123 is located in the installation space 11c and can be elastically deformed along the extension direction of the injection hole 11a. The sealing ring 122 is provided on the side surface of the elastic body 123 facing the injection hole 11a to seal with the upper cover 111. In the projection plane perpendicular to the extension direction of the injection hole 11a, the projection of the injection hole 11a is located on the inner side of the projection of the sealing ring 122. The elastic modulus of the elastic body 123 is greater than the elastic modulus of the sealing ring 122. The avoidance protrusion 121 is located on the inner side of the sealing ring 122, and the accommodating cavity 112a is away from the side of the opening 112b. At least one pair of positioning ribs 1122 is provided on the inner wall, and the positioning ribs 1122 extend perpendicularly to the thickness direction of the upper cover 111. The two positioning ribs 1122 in a pair are spaced apart along the extension direction thereof. At least one pair of positioning grooves 12a is provided at one end of the elastic body 123 away from the opening 112b. The two positioning grooves 12a in a pair are respectively provided on opposite sides of the elastic body 123 perpendicular to the thickness direction of the upper cover 111. The side of the positioning groove 12a away from the opening 112b and the side away from the other positioning groove 12a are open. The positioning rib 1122 can be embedded in the positioning groove 12a along the extension direction of the liquid injection hole 11a and fit against the inner wall of the positioning groove 12a.

[0173] The embodiment of the present disclosure also provides a battery cell 103. Referring to Figure 3, the battery cell 103 includes a shell 20, an electrode assembly 30 and a cover assembly 10 of any of the aforementioned embodiments. A mounting cavity 20a is provided in the shell 20, and one side of the mounting cavity 20a is open to form a mounting opening 20b. The electrode assembly 30 is provided in the mounting cavity 20a, and the cover assembly 10 covers the mounting opening 20b. The guide hole 11b connects the mounting space 11c and the mounting cavity 20a.

[0174] When the cover assembly 10 is in the connected state, electrolyte can enter the mounting cavity 20a from the outside through the injection hole 11a, the mounting space 11c, and the guide hole 11b. This allows for opening and closing the injection hole 11a during multiple production processes for the battery cells 103, including helium testing, vacuum baking, injection, formation, and aging. This expands the scope of use, improves production efficiency, and facilitates subsequent electrolyte replenishment for the battery cells 103.

[0175] In an embodiment in which an upper cover 111 and a lower cover 112 are provided, an electrode column 14 is provided on the side of the upper cover 111 facing away from the lower cover 112, and the electrode column 14 is electrically connected to the electrode assembly 30 so that the electric energy generated by the electrochemical reaction between the electrolyte and the electrode assembly 30 is output through the electrode column 14, or the external current passes through the electrode column 14 to cause an electrochemical reaction between the electrolyte and the electrode assembly 30.

[0176] The embodiment of the present disclosure further provides a battery 100 , which includes several battery cells 103 in the aforementioned embodiments.

[0177] In this way, by controlling the opening and closing of the liquid injection hole 11 a , it is convenient to replenish the electrolyte into the battery cells 103 in the battery 100 , which is beneficial to extending the service life of the battery 100 .

[0178] An embodiment of the present disclosure further provides an electrical device, which includes the battery 100 in the aforementioned embodiment, and the battery 100 is used as a power source for the electrical device.

[0179] In this way, by controlling the opening and closing of the liquid injection hole 11 a , it is convenient to replenish the electrolyte into the battery cells 103 in the battery 100 , which is beneficial to extending the service life of the electrical device.

[0180] The various embodiments / implementations provided in the present disclosure can be combined with each other without causing any contradiction.

[0181] The above description is merely a preferred embodiment of the present disclosure and is not intended to limit the embodiments of the present disclosure. Those skilled in the art will appreciate that various modifications and variations of the embodiments of the present disclosure are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present disclosure shall be included within the scope of protection of the embodiments of the present disclosure.

Claims

1. A cover plate assembly, comprising: The cover body is provided with a liquid injection hole, a guide hole and an installation space, wherein the liquid injection hole and the guide hole are both connected to the installation space, and the inlet of the liquid injection hole and the outlet of the guide hole are located on opposite sides of the cover body along the thickness direction thereof; an elastic sealing member, at least a portion of which is disposed in the installation space and is elastically deformable along an extension direction of the liquid injection hole; The cover plate assembly includes a sealed state and a connected state; In the sealed state, the inner wall of the installation space at the position where the installation space communicates with the liquid injection hole is in sealing contact with the elastic sealing member to block the outlet of the liquid injection hole; In the connected state, the elastic seal is compressed along the extending direction of the liquid injection hole, so that the inner wall of the connection position between the installation space and the liquid injection hole is separated from the elastic seal.

2. The cover plate assembly according to claim 1, wherein: The liquid injection hole extends along the thickness direction of the cover plate body; And / or, the extension direction of the guide hole is perpendicular to the thickness direction of the cover plate body.

3. The cover plate assembly according to claim 1 or 2, wherein: In a projection perpendicular to the extending direction of the liquid injection hole, the projection of the liquid injection hole is located within the projection range of the elastic sealing component, and the projection boundaries of the two are spaced apart.

4. The cover plate assembly according to any one of claims 1 to 3, wherein: One of the inner wall of the installation space and the surface of the elastic seal is provided with a positioning rib, and the other is provided with a positioning groove. The positioning rib is embedded in the positioning groove and abuts against the inner wall of the positioning groove perpendicular to the extension direction of the liquid injection hole.

5. The cover plate assembly according to any one of claims 1 to 4, wherein: At least a portion of the outer wall of the elastic sealing member that is perpendicular to the extending direction of the liquid injection hole abuts against the inner wall of the installation space that is perpendicular to the extending direction of the liquid injection hole.

6. The cover plate assembly according to any one of claims 1 to 5, wherein: A portion of the elastic seal extends into the liquid injection hole, and in a projection plane perpendicular to the extension direction of the liquid injection hole, a projection of the portion of the elastic seal is located within the projection range of the liquid injection hole.

7. The cover plate assembly according to any one of claims 1 to 6, wherein: The elastic seal is provided with an avoidance protrusion on one side surface facing the injection hole, and the avoidance protrusion extends into the injection hole. Along the direction away from the elastic seal, the distance between the side wall of the avoidance protrusion perpendicular to the extension direction of the injection hole and the inner wall of the injection hole gradually increases.

8. The cover plate assembly according to claim 7, wherein: The connection position between the avoidance protrusion and the elastic sealing member forms a first arc surface, and the boundary of the outlet of the injection hole forms a second arc surface. In the sealed state, the first arc surface and the second arc surface are sealed and fitted together.

9. The cover plate assembly according to claim 7 or 8, wherein: The cover plate assembly further includes a pressing rod, which is detachably inserted into the avoidance protrusion and passes through the liquid injection hole and extends out of the entrance of the liquid injection hole.

10. The cover plate assembly according to any one of claims 1 to 9, wherein: The elastic sealing component includes an elastomer and a sealing ring. The elastomer is located in the installation space and can be elastically deformed along the extension direction of the injection hole. The sealing ring is provided on the side surface of the elastomer facing the injection hole to seal with the inner wall connecting the installation space and the injection hole. In the projection plane perpendicular to the extension direction of the injection hole, the projection of the injection hole is located on the inner side of the projection of the sealing ring. The elastic modulus of the elastomer is greater than the elastic modulus of the sealing ring.

11. The cover plate assembly according to any one of claims 1 to 10, wherein: The cover plate body includes an upper cover and a lower cover, the upper cover and the lower cover are fitted together along the thickness direction of the upper cover, the injection hole passes through the upper cover along the thickness direction of the upper cover, a part of the lower cover protrudes in the direction away from the upper cover to form a mounting protrusion, the guide hole is provided in the mounting protrusion, a receiving cavity is provided in the mounting protrusion, the receiving cavity is open to one side of the upper cover to form an opening, the upper cover is provided on the opening to enclose the lower cover to form the mounting space, the elastic seal can be sealed and fitted with or separated from the upper cover, and on the projection surface perpendicular to the thickness direction of the upper cover, the projection of the elastic seal is located within the range of the opening.

12. The cover plate assembly according to claim 11, wherein: The accommodating cavity includes a first sub-cavity and a second sub-cavity, the first sub-cavity is located on a side of the second sub-cavity close to the upper cover, and the opening is provided on a side of the first sub-cavity away from the second sub-cavity. The first sub-cavity extends along the extension direction of the injection hole. On a projection plane perpendicular to the thickness direction of the upper cover, the projection of the first sub-cavity is located within the projection range of the second sub-cavity, and at least a portion of the side wall of the elastic seal perpendicular to the extension direction of the injection hole abuts against the side wall of the first sub-cavity.

13. The cover plate assembly according to claim 11 or 12, wherein: At least one pair of positioning ribs is provided on the inner wall of the accommodating cavity away from the opening, and the positioning ribs extend perpendicularly to the thickness direction of the upper cover, and the two positioning ribs in a pair are spaced apart along their extension direction. The elastic seal is provided with at least one pair of positioning grooves at one end away from the opening, and the two positioning grooves in a pair are respectively provided on opposite sides of the elastic seal perpendicular to the thickness direction of the upper cover. The positioning groove is open on one side away from the opening and on a side away from the other positioning groove, and the positioning rib can be embedded in the positioning groove along the extension direction of the liquid injection hole and fit with the inner wall of the positioning groove.

14. A battery cell, comprising a shell, an electrode assembly and the cover assembly according to any one of claims 1 to 13, wherein a mounting cavity is provided in the shell, one side of the mounting cavity is open to form a mounting opening, the electrode assembly is provided in the mounting cavity, the cover assembly is covered on the mounting opening, and the guide hole connects the mounting space and the mounting cavity. 15 . A battery comprising a plurality of battery cells according to claim 14 .

16. An electric device comprising the battery according to claim 15, wherein the battery is used as a power source for the electric device.

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