Battery monomer, battery device and electric device

Abstract

The utility model belongs to the technical field of batteries, and provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode terminal, a cover body and a bonding piece, the electrode terminal is provided with a liquid injection hole and a sealing groove, and the sealing groove is arranged around the liquid injection hole; the cover body is connected with the electrode terminal and can cover the liquid injection hole and the sealing groove; and the bonding piece is positioned in the sealing groove and is connected with the cover body, so that the cover body is limited on the electrode terminal. According to the invention, the cover body is not easy to tilt, so that the sealing effect on the liquid injection hole of the battery monomer is improved.

Description

Technical Field

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

[0002] When lithium-ion batteries are produced, workers need to add electrolyte into the lithium-ion battery through the injection hole, and then seal the opening of the injection hole with a sealing pin. The sealing pin can be understood as a cover structure.

[0003] In the related art, when the sealing pin is connected to the electrode terminal, the problem of the pin lifting easily occurs, thereby affecting the sealing performance of the connection between the cover body and the electrode terminal. Utility Model Content

[0004] The purpose of the present application is to provide a battery cell, a battery device and an electrical device, aiming to solve the technical problem that the cover of the battery cell is prone to warping up, thereby affecting the sealing effect.

[0005] In a first aspect, the present application provides a battery cell, comprising:

[0006] The electrode terminal has a liquid injection hole and a sealing groove, wherein the sealing groove is arranged around the liquid injection hole;

[0007] A cover body connected to the electrode terminal, the cover body being capable of covering the injection hole and the sealing groove;

[0008] The bonding member is located in the sealing groove and connected to the cover body so that the cover body is limited on the electrode terminal.

[0009] In this embodiment, a sealing groove is provided on the electrode terminal, and an adhesive is placed in the sealing groove. When the cover body is connected to the electrode terminal, the sealant can pre-bond the cover body to the electrode terminal to limit the cover body, thereby helping to reduce the risk of the cover body moving relative to the electrode terminal.

[0010] In one embodiment, a first recessed groove is formed on the electrode terminal, the sealing groove and the injection hole are both arranged on the bottom surface of the first recessed groove, and the cover body is at least partially accommodated in the first recessed groove.

[0011] In this embodiment, the first recessed groove can accommodate the cover body, thereby facilitating the reduction of the portion of the cover body exposed outside the electrode terminal, thereby improving space utilization and enhancing the limiting effect on the cover body.

[0012] In one embodiment, the electrode terminal has an assembly surface, the first recess is formed on the assembly surface, and the surface of the cover is flush with the assembly surface.

[0013] In this embodiment, the surface of the cover body is flush with the assembly surface, which is beneficial to improving the flatness and aesthetics of the assembly surface of the electrode terminal.

[0014] In one embodiment, the groove depth of the first sinking groove ranges from 0.8 mm to 1.5 mm.

[0015] In this embodiment, a groove depth of 0.8 mm to 1.5 mm can enable the electrode terminal to provide sufficient support force for the cover body while being beneficial to reducing the weight of the electrode terminal and ensuring sufficient strength and stiffness.

[0016] In one embodiment, a second sinking groove is formed on the groove bottom surface of the first sinking groove, the liquid injection hole is opened on the groove bottom surface of the second sinking groove, and the sealing groove is arranged on the outer periphery of the groove opening of the second sinking groove.

[0017] In this embodiment, by forming the second sinking groove and making the liquid injection hole opened on the groove bottom surface of the second sinking groove, it is beneficial to keep the liquid injection hole away from the cover body and the sealing groove, reduce the risk of warping nails when the cover body is connected to the electrode terminal, and improve the welding effect.

[0018] In one embodiment, one or more connecting channels are formed on the groove wall of the sealing groove, and the connecting channels communicate the sealing groove and the second sinking groove.

[0019] In this embodiment, by providing the connecting channels, the excess bonding parts in the sealing groove can be discharged into the connecting channels, so as to reduce the resistance of the bonding parts to the cover body when the cover body is connected, and improve the convenience and reliability of installation.

[0020] In one embodiment, the groove depth of the second sinking groove ranges from 1.5 mm to 3.0 mm.

[0021] In this embodiment, a groove depth of 1.5 mm to 3.0 mm can enable a larger accommodation space to be formed on the electrode terminal to facilitate adding additional sealing components and provide sufficient support force for the cover body, which is beneficial to reducing the weight of the electrode terminal and ensuring sufficient strength and stiffness.

[0022] In one embodiment, the cover body includes a cover main body and a convex portion connected to the cover main body. The convex portion is arranged in a ring shape matching the sealing groove, and the convex portion can be at least partially inserted into the sealing groove to contact the bonding parts.

[0023] In this embodiment, through the convex portion and making the convex portion inserted and matched with the sealing groove, on the one hand, it forms a limit for the cover body, and on the other hand, it is more convenient for the bonding parts to be bonded and matched with the cover body through the convex portion, which is beneficial to increasing the bonding area and further improving the connection reliability.

[0024] In one embodiment, the convex portion is arranged in a continuous shape around the liquid injection hole; or,

[0025] The raised part is arranged around the injection hole in a discontinuous manner.

[0026] In this embodiment, the protrusion extends continuously in a ring shape, so that it can contact more adhesive parts, thereby increasing the connection area and improving the connection strength. The intermittent protrusion is conducive to saving material costs, and can also serve the purpose of contacting with the adhesive part to form a limit to the cover body.

[0027] In one embodiment, the groove depth of the sealing groove is in the range of 0.4 mm to 1.0 mm, and the protrusion height of the protrusion is in the range of 0.2 mm to 0.5 mm.

[0028] In this embodiment, the depth of the sealing groove needs to be set in coordination with the height of the protruding portion, so as to facilitate the setting of the adhesive member, thereby improving the connection strength between the cover body and the electrode terminal.

[0029] In one embodiment, the outer diameter of the cover body is greater than the outer diameter of the protrusion, so that the cover body forms an outer edge portion near the edge compared to the protrusion, and the outer edge portion abuts against the electrode terminal.

[0030] In this embodiment, by forming the outer edge portion, it is helpful to enhance the sealing between the cover body and the electrode terminal, reduce the risk of the adhesive overflowing to the position where the cover body and the electrode terminal are welded, and help improve the quality of the welding between the cover body and the electrode terminal and improve the connection reliability.

[0031] In one embodiment, along a direction perpendicular to the groove depth of the sealing groove, the outer convex width of the outer edge portion compared to the convex portion is 0.3 mm-1.0 mm.

[0032] In this embodiment, the outer edge portion adopts a convex width in the range of 0.3mm-1.0mm, which can take into account the distance between the adhesive and the injection hole and the groove wall of the first sink groove, thereby helping to reduce the impact of the adhesive on welding and electrolyte, and improve the reliability of the battery cell.

[0033] In one embodiment, the sealing groove includes at least two concentrically arranged sealing sub-grooves, and a bonding element is arranged in at least one of the sealing sub-grooves.

[0034] In this embodiment, a plurality of concentrically arranged sealing sub-grooves are provided, thereby improving the sealing performance between the cover body and the electrode terminal.

[0035] In one embodiment, one or more through channels are arranged between two adjacent sealing sub-grooves to connect the two adjacent sealing sub-grooves.

[0036] In this embodiment, a through channel is provided between adjacent sealing sub-grooves, thereby balancing the volume of the adhesive members in the two sealing sub-grooves, so as to balance the stress between the cover body and the electrode terminal.

[0037] In one embodiment, the bottom surface of the sealing groove is in the shape of an arc surface.

[0038] In this embodiment, the arc-shaped bottom surface of the groove is more conducive to the directional convergence of the flowing bonding member, so as to reduce the generation of voids, make the filling effect of the bonding member denser, and improve the connection strength.

[0039] In one embodiment, the battery cell further includes a plugging member, and the plugging member is connected to the electrode terminal and seals the liquid injection hole.

[0040] In this embodiment, by adding a plugging member, a double-layer seal of the liquid injection hole is formed, so as to improve the sealing effect and reduce the risk of electrolyte leakage.

[0041] In one embodiment, the electrode terminal includes a terminal body portion and a boss portion connected to the terminal body portion. The boss portion protrudes from the terminal body portion, and both the liquid injection hole and the sealing groove are opened on the protruding end surface of the boss portion.

[0042] In this embodiment, the electrode terminal is connected to the terminal body portion in a way that the boss portion protrudes, which can make the terminal body portion have a smaller thickness, so as to facilitate reducing the material consumption and lowering the production cost.

[0043] In one embodiment, the battery cell further includes a housing and an electrode assembly. The housing has a receiving cavity, and the electrode assembly is received in the receiving cavity; the electrode terminal is connected to the housing and is electrically connected to the electrode assembly.

[0044] In this embodiment, the housing plays a role in supporting the electrode terminal to improve the installation stability of the electrode terminal.

[0045] In a second aspect, the present application provides a battery device, and the battery device includes the battery cell as described in any one of the above.

[0046] In a third aspect, the present application provides an electrical device, including the battery cell as described in any one of the above or the battery device as described above, and the battery device is used for storing or providing electrical energy.

[0047] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically exemplified below. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments of the present application or the prior art. Obviously, the following described drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0049] Figure 1 Structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0050] Figure 2 Exploded structural schematic diagram of a battery device provided by some embodiments of the present application Figure 1 ;

[0051] Figure 3 Exploded structural schematic diagram of a battery device provided by some embodiments of the present application Figure 2 ;

[0052] Figure 4 Exploded structural schematic diagram of a battery cell provided by some embodiments of the present application Figure 1 ;

[0053] Figure 5 Exploded structural schematic diagram of a battery cell provided by some embodiments of the present application Figure 2 ;

[0054] Figure 6 Structural schematic diagram of the connection between the electrode terminal and the cover body in a battery cell provided by some embodiments of the present application;

[0055] Figure 7 For Figure 6 Top view;

[0056] Figure 8 For Figure 7 A-A section in Figure 1 ;

[0057] Figure 9 For Figure 7 A-A section in Figure 2 ;

[0058] Figure 10 For Figure 9 Partial enlarged view at position B in

[0059] Figure 11 For Figure 7 A-A section in Figure 3 ;

[0060] Figure 12 For Figure 11 Partial enlarged view at position C in Figure 1 ;

[0061] Figure 13 For Figure 11 Partial enlarged view of position C in Figure 2 ;

[0062] Figure 14 For Figure 11 Exploded structure schematic diagram of

[0063] Figure 15 For Figure 14 Partial enlarged view of position D in

[0064] Figure 16 For Figure 14 Partial enlarged view of position E in

[0065] Figure 17 For Figure 14 Axonometric view of

[0066] Figure 18 Schematic diagram of the structure of the cover body in the battery cell provided by some embodiments of the present application Figure 1 ;

[0067] Figure 19 Schematic diagram of the structure of the cover body in the battery cell provided by some embodiments of the present application Figure 2 .

[0068] Description of reference numerals:

[0069] 1000, vehicle; 1100, battery device; 1110, battery cell; 1111, housing; 11111, accommodation cavity; 11112, first part; 11113, second part; 1112, electrode terminal; 11121, bottom surface of the sealing groove; 11122, sealing groove; 11123, first sinking groove; 11124, second sinking groove; 11125, assembly surface; 11126, connection channel; 11127, sealing sub-groove; 11128, through channel; 1113, cover body; 11131, cover main body; 11132, protruding part; 11133, outer edge part; 1114, liquid injection hole; 1115, bonding part; 1116, plugging component; 1117, electrode assembly; 1118, terminal body part; 1119, boss part; 1120, box body; 1121, first structural part; 1122, second structural part; 1123, accommodation space; 1200, controller; 1300, motor; X, first direction; Y, second direction; H1, depth of the first sinking groove; H2, depth of the second sinking groove; H3, depth of the sealing groove; H4, protruding height of the protruding part; L, outer convex width of the outer edge part. Detailed implementation manners

[0070] The embodiments of the technical solution of the present application will be described in detail below in conjunction with the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, and therefore are only used as embodiments and cannot be used to limit the protection scope of the present application.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0072] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0073] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0074] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the front and rear associated objects.

[0075] In the description of the embodiments of the present application, the term "a plurality" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0076] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0077] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0078] As the lithium battery industry is booming, lithium batteries are widely used in many fields such as automobiles, electronic equipment, energy storage systems, etc. Among them, automotive power batteries, as the core components of new energy vehicles, have extremely high requirements on the performance and safety of lithium batteries.

[0079] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and non-aqueous electrolyte solutions. Lithium batteries are divided into lithium metal batteries and lithium ion batteries. Among them, lithium ion batteries do not contain metallic lithium and are rechargeable. They mainly rely on the movement of lithium ions between the positive and negative electrodes to work, that is, during the charging and discharging process, Li+ is embedded and de-embedded between the two electrodes: when charging, Li+ is de-embedded from the positive electrode and embedded in the negative electrode through the electrolyte (or electrolyte), and the negative electrode is in a lithium-rich state; the opposite is true during discharge.

[0080] During the production process of lithium-ion batteries, workers need to add electrolyte into the lithium-ion battery through the injection hole, and then seal the opening of the injection hole with a sealing pin (or cover) to prevent the electrolyte from leaking.

[0081] In the related art, the liquid injection port is opened on the electrode terminal, and the sealing pin is connected to the electrode terminal to seal the liquid injection port. However, when the sealing pin is connected to the electrode terminal, the problem of pin warping easily occurs, and the heat entering affects the sealing of the connection between the sealing pin and the electrode terminal.

[0082] Among them, in the field of battery manufacturing, "lifted nails" refers to the phenomenon that one end or part of the sealing nail (or cover body) is separated from the filling port and lifted upwards during the sealing process of the battery filling port. For example, in the production of lithium batteries, if the sealing nail is not limited in advance during the operation, the position of the sealing nail is very easy to shift, which can easily cause the problem of lifted nails; for example, when welding the sealing nails, due to the presence of electrolyte near the filling port, the electrolyte is heated and vaporized and expands to generate pressure, which may cause the position of the sealing nail to shift, and then the problem of lifted nails may occur.

[0083] Lifted pins can seriously affect the quality and reliability of battery cells. On the one hand, it destroys the sealing structure of the injection port, making it easy for the electrolyte to leak, leading to abnormal chemical reactions inside the battery cell, reducing the performance and service life of the battery cell; on the other hand, electrolyte leakage may also cause a short circuit, leading to accidents.

[0084] Therefore, the present application provides a battery cell, which provides a sealing groove on the electrode terminal, and an adhesive is placed in the sealing groove. When the cover body is connected to the electrode terminal, the sealant can pre-bond the cover body to the electrode terminal to limit the cover body, thereby helping to reduce the risk of the cover body moving relative to the electrode terminal. When the cover body and the electrode terminal are subsequently welded, the cover body is not prone to warping and shifting relative to the electrode terminal, so that the sealing between the cover body and the electrode terminal is improved, thereby improving the sealing effect of the injection hole.

[0085] Specifically, the embodiment of the present application provides a battery cell 1110, which refers to the smallest unit constituting the battery device 1100. Each battery cell 1110 may be a secondary battery cell or a primary battery cell; it may also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 1110 may be cylindrical, flat, rectangular, or in other shapes.

[0086] According to some embodiments of the present application, referring to Figures 4-8 As shown, an embodiment of the present application provides a battery cell 1110, and the battery cell 1110 includes an electrode terminal 1112, a cover body 1113 and an adhesive member 1115; wherein the electrode terminal 1112 has an injection hole 1114 and a sealing groove 11122, and the sealing groove 11122 is arranged around the injection hole 1114; the cover body 1113 is welded to the electrode terminal 1112, and the cover body 1113 can cover the injection hole 1114 and the sealing groove 11122; the adhesive member 1115 is located in the sealing groove 11122 and is connected to the cover body 1113, so that the cover body 1113 is limited on the electrode terminal 1112.

[0087] Specifically, the electrode terminal 1112 is a component of the battery cell 1110 for connecting to an external circuit and enabling current transmission and signal transfer. In the battery cell 1110, the electrode terminal 1112 connects the internal electrode assembly 1117 of the battery cell 1110 to the external circuit, enabling the battery cell 1110 to output electrical energy to power a device or receive electrical energy from an external power source during charging.

[0088] In the battery cell 1110, the electrode terminal 1112 is typically mounted on the housing 1111 of the battery cell 1110 to facilitate the connection of the battery cell 1110 to an external circuit. Taking a cylindrical battery as an example, the electrode terminals 1112 of the positive and negative electrodes are generally located at both ends of the battery cell 1110; for a square battery, the electrode terminals 1112 of the square battery may be on the same side or different sides of the battery. It can be understood that the battery cell 1110 further includes a housing 1111, and the electrode terminal 1112 is connected to the housing 1111. The battery cell 1110 further includes an electrode assembly 1117, and the electrode assembly 1117 is accommodated in the accommodation cavity 11111 inside the housing 1111. The electrode assembly 1117 is directly electrically connected to the electrode terminal 1112, or the electrode assembly 1117 is indirectly electrically connected to the electrode terminal 1112 through a transfer component or a transfer sheet.

[0089] The liquid injection hole 1114 is a passage for the electrolyte to enter the accommodation cavity 11111 inside the housing 1111. The liquid injection hole 1114 is opened on the electrode terminal 1112, and the liquid injection hole 1114 penetrates from the part of the electrode terminal 1112 exposed outside the housing 1111 to the part of the electrode terminal 1112 extending into the housing 1111 to achieve communication with the accommodation cavity 11111.

[0090] Refer to Figure 8 As shown, a sealing groove 11122 is opened on the electrode terminal 1112. Specifically, the sealing groove 11122 should be opened on the part of the electrode terminal 1112 exposed outside the accommodation cavity 11111. The sealing groove 11122 is arranged around the liquid injection hole 1114. For example, the electrode terminal 1112 has an assembly surface 11125, and both the sealing groove 11122 and the liquid injection hole 1114 are opened on this assembly surface 11125. The liquid injection hole 1114 is located at the center, and the sealing groove 11122 extends in a ring shape around the central axis of the liquid injection hole 1114. For example, the sealing groove 11122 can extend in a ring shape along a circular, elliptical or polygonal trajectory. The groove depth direction of the sealing groove 11122 can be parallel to or at an angle to the central axis direction of the liquid injection hole 1114.

[0091] Refer to Figure 8As shown, the bonding member 1115 is disposed in the sealing groove 11122. The bonding member 1115 should be understood as a solid substance, a liquid substance, or a solid-liquid mixture with bonding force, etc. For example, the bonding member 1115 can be understood as an adhesive, and the adhesive can accelerate curing when heated. The function of the bonding member 1115 is to limit the cover body 1113 on the electrode terminal 1112 and enable the cover body 1113 to cover and seal the sealing groove 11122 and the liquid injection hole 1114. Therefore, it can be seen that the bonding member 1115 needs to be in contact with the cover body 1113. The cover body 1113 can be in the shape of a flat plate, and the bonding member 1115 can form a part that overflows the notch of the sealing groove 11122 so that the bonding member 1115 is in contact with the plate surface of the cover body 1113. When the bonding member 1115 is made of a flowable liquid material, the bonding member 1115 can be disposed inside the sealing groove 11122 by filling.

[0092] The cover body 1113 can be made of a metal material so that the cover body 1113 has electrical conductivity and is connected to the electrode terminal 1112, thus not affecting the connection and conduction between the electrode terminal 1112 and the external circuit. Or, when the surface of the electrode terminal 1112 connected to the external circuit is large enough, the cover body 1113 can also be made of a non-metallic material so that the cover body 1113 does not affect the electrical connection between the electrode terminal 1112 and the external circuit.

[0093] Then it can be understood that the bonding member 1115 can also adopt an adhesive with electrical conductivity to achieve the purpose of reducing resistance and improving the stability of current transmission. In addition, the bonding member 1115 forms a sealing structure between the cover body 1113 and the liquid injection hole 1114, achieving a sealing effect, which is beneficial to reducing the risk of electrolyte leakage and the risk of external substances such as moisture and oxygen entering the battery cell 1110.

[0094] Taking the adhesive 1115 as an example, when the cover 1113 and the electrode terminal 1112 are assembled and welded, first, the adhesive 1115 is set in the sealing groove 11122. In the early stage, the thermal adhesive is in a flowable state, and the sealing groove 11122 can be quickly filled and completely; the cover 1113 and the electrode terminal 1112 are pre-assembled, and the position of the cover 1113 relative to the electrode assembly 1117 is adjusted. The adhesive force of the adhesive 1115 enables the cover 1113 to be limited on the electrode terminal 1112, and the cover 1113 is not easy to slide off, and is fixed relative to the position of the electrode terminal 1112. The adhesive 1115 surrounds the injection hole 1112. 114 is circumferentially connected, thereby playing a sealing role, and the electrolyte is not easy to leak out; then the cover body 1113 and the electrode terminal 1112 are welded, and the welding will generate heat. The heat is transferred to the adhesive 1115, which will accelerate the curing of the adhesive 1115 and improve the bonding and fixing effect of the cover body 1113. Even if there is electrolyte at the welding position and the electrolyte vaporizes to generate gas to exert a force on the cover body 1113, due to the adhesive force of the adhesive 1115 on the cover body 1113, the cover body 1113 is not easy to deviate relative to the electrode terminal 1112, thereby reducing the risk of the cover body 1113 warping relative to the electrode terminal 1112.

[0095] In this embodiment, a sealing groove 11122 is provided on the electrode terminal 1112, and an adhesive 1115 is placed in the sealing groove 11122. When the cover body 1113 is connected to the electrode terminal 1112, the sealant can pre-bond the cover body 1113 to the electrode terminal 1112 to limit the cover body 1113, thereby helping to reduce the risk of the cover body 1113 moving relative to the electrode terminal 1112. When the cover body 1113 and the electrode terminal 1112 are subsequently welded, the adhesive force of the adhesive 1115 is greatly improved due to heat bonding, so that the cover body 1113 is not easy to be lifted or shifted relative to the electrode terminal 1112, so that the sealing between the cover body 1113 and the electrode terminal 1112 is improved, and the sealing effect of the injection hole 1114 is improved.

[0096] In some embodiments, reference Figure 9 and Figure 10 As shown, a first sink groove 11123 is formed on the electrode terminal 1112 , the sealing groove 11122 and the injection hole 1114 are both arranged on the bottom surface of the first sink groove 11123 , and the cover body 1113 is at least partially accommodated in the first sink groove 11123 .

[0097] Specifically, the first sink groove 11123 is used to accommodate the cover body 1113 , thereby helping to reduce the space occupied by the cover body 1113 outside the electrode terminal 1112 , and can also limit the cover body 1113 .

[0098] For example, the electrode terminal 1112 has an assembly surface 11125, and a first sunk groove 11123 is formed on the assembly surface 11125. The depth of the first sunk groove 11123 can be less than, equal to, or greater than the thickness of the cover 1113. The shape of the opening of the first sunk groove 11123 should match the shape of the cover 1113, so that the cover 1113 can be placed in the first sunk groove 11123 in a matching manner. The circumferential direction of the cover 1113 is in close contact with or has a small gap from the groove wall of the first sunk groove 11123. The surface of the cover 1113 facing the bottom surface of the first sunk groove 11123 can be in close contact with the bottom surface of the first sunk groove 11123 and is in contact with the bonding member 1115. The position where the cover 1113 is close to or abuts against the groove wall of the first sunk groove 11123 is the welding position. During welding, the heat at this position can be transferred to the bonding member 1115 in the sealing groove 11122.

[0099] The sealing groove 11122 is formed on the bottom surface of the first sunk groove 11123. The annular shape of the sealing groove 11122 can match the shape of the opening of the first sunk groove 11123. For example, if the shape of the opening of the first sunk groove 11123 is circular, the sealing groove 11122 extends along a circular track concentric with the first sunk groove 11123. The diameter of the circular track of the sealing groove 11122 should be smaller than the diameter of the opening of the first sunk groove 11123. The groove wall on the side of the sealing groove 11122 away from the center of the circle can be flush with the groove wall of the first sunk groove 11123, or the groove wall on the side of the sealing groove 11122 away from the center of the circle can be offset from the groove wall of the first sunk groove 11123. Wherein, the depth direction of the first sunk groove 11123 can be defined as the first direction X, and the depth direction of the sealing groove 11122 can also be along the first direction X.

[0100] The liquid injection hole 1114 is formed on the bottom surface of the first sunk groove 11123. The liquid injection hole 1114 can be located at the center of the bottom surface, and the sealing groove 11122 surrounds the liquid injection hole 1114.

[0101] In this embodiment, the first sunk groove 11123 can accommodate the cover 1113, which is beneficial to reducing the part of the cover 1113 exposed outside the electrode terminal 1112, thereby improving the space utilization rate and enhancing the limiting effect on the cover 1113.

[0102] In some embodiments, referring to Figure 9 and Figure 10 as shown, the electrode terminal 1112 has an assembly surface 11125, and a first sunk groove 11123 is formed on the assembly surface 11125. The surface of the cover 1113 is flush with the assembly surface 11125.

[0103] Specifically, the assembly surface 11125 can be understood as a partial area on the surface of the electrode terminal 1112. For example, if the electrode terminal 1112 is a columnar structure, the assembly surface 11125 can be understood as one end face of the columnar structure. It can be known that the first sinking groove 11123 is arranged on one end face of the columnar structure. The assembly surface 11125 is a plane parallel to the second direction Y, and the second direction Y is perpendicular to the first direction X.

[0104] The cover 1113 adopts a sheet structure and has two opposite surfaces. After the cover 1113 is inserted and accommodated in the first sinking groove 11123, the exposed surface on the cover 1113 is flush with the assembly surface 11125, which is beneficial to improving the flatness and aesthetics of the assembly surface 11125 of the electrode terminal 1112. And being flush is convenient for welding the cover 1113 and the groove wall of the first sinking groove 11123 at the connected position, improving the flatness and aesthetics of the welding position.

[0105] In this embodiment, the surface of the cover 1113 is flush with the assembly surface 11125, which is beneficial to improving the flatness and aesthetics of the assembly surface 11125 of the electrode terminal 1112.

[0106] In some embodiments, referring to Figure 10 As shown, the groove depth H1 of the first sinking groove ranges from 0.8 mm to 1.5 mm.

[0107] Specifically, when the cover 1113 is embedded in the first sinking groove 11123, an appropriate groove depth enables the cover 1113 to be in close contact with the bottom surface and the groove wall surface of the first sinking groove 11123, forming an effective sealing structure.

[0108] In terms of structural strength, a groove depth of 0.8 mm - 1.5 mm will neither cause insufficient stability after the cover 1113 is installed due to being too shallow, nor weaken the overall structural strength of the installation base due to being too deep. A shallower groove depth may not provide sufficient support and limit for the cover 1113, and it is prone to displacement when subjected to external forces; while a too deep groove depth will greatly reduce the thickness of the electrode terminal 1112 in the sinking groove area, reducing the ability of the electrode terminal 1112 to resist external forces such as bending and stretching. The groove depth range of 0.8 mm - 1.5 mm well balances the above two relationships, which is beneficial to improving the reliability and stability of the cover 1113 and the electrode terminal 1112 during long-term use.

[0109] In this embodiment, a groove depth of 0.8 mm - 1.5 mm can enable the electrode terminal 1112 to provide sufficient support force for the cover 1113 while being beneficial to reducing the weight of the electrode terminal 1112 and ensuring sufficient strength and stiffness.

[0110] In some embodiments, referring toFigure 11 and Figure 12 As shown in Figure 12 , a second sink 11124 is formed on the bottom surface of the first sink 11123, the liquid injection hole 1114 is formed on the bottom surface of the second sink 11124, and the sealing groove 11122 is disposed on the outer periphery of the opening of the second sink 11124.

[0111] Specifically, the second sink 11124 is formed on the bottom surface of the first sink 11123. The second sink 11124 may also be located at the center of the bottom surface of the first sink 11123. The outer diameter of the second sink 11124 is smaller than that of the first sink 11123, such that the first sink 11123 and the second sink 11124 can form a stepped groove structure arranged concentrically. The depth direction of the second sink 11124 may be along the first direction X.

[0112] The sealing groove 11122 is formed on the bottom surface of the first sink 11123. Therefore, it can be understood that the sealing groove 11122 is disposed on the outer periphery of the opening of the second sink 11124.

[0113] The liquid injection hole 1114 is formed on the bottom surface of the second sink 11124. The liquid injection hole 1114 may be formed at the center of the bottom surface of the second sink 11124. It can be seen that since the liquid injection hole 1114 is formed on the bottom surface of the second sink 11124 and the sealing groove 11122 is formed on the bottom surface of the second sink 11124, it can be known that the sealing groove 11122 and the liquid injection hole 1114 are distributed on different stepped surfaces, such that the sealing groove 11122 is far away from the liquid injection hole 1114, and the liquid injection hole 1114 is located at a lower or bottom position relative to the sealing groove 11122, such that the electrolyte is not easily splashed onto the bottom surfaces of the sealing groove 11122 and the first sink 11123. That is to say, the positions where the cover 1113 contacts, adheres to, and is welded to the electrode terminal 1112 are not easily contaminated by the electrolyte. During welding, the electrolyte is not easily vaporized, which is conducive to improving the welding effect and reducing the risk of warped pins.

[0114] In this embodiment, by forming the second sink 11124 and forming the liquid injection hole 1114 on the bottom surface of the second sink 11124, it is conducive to keeping the liquid injection hole 1114 away from the cover 1113 and the sealing groove 11122, reducing the risk of warped pins when the cover 1113 is connected to the electrode terminal 1112, and improving the welding effect.

[0115] In some embodiments, as shown in Figure 17 Figure 17 , one or more connection channels 11126 are formed on the groove wall of the sealing groove 11122, and the connection channels 11126 communicate the sealing groove 11122 and the second sink 11124.

[0116] Since the sealing groove 11122 is formed on the bottom surface of the second sinking groove 11124 and surrounds the outer periphery of the notch of the first sinking groove 11123, it can be known that a circumferential groove wall is formed on one side of the sealing groove 11122 close to the first sinking groove 11123, and the circumferential groove wall has a certain thickness.

[0117] A connecting channel 11126 is formed on the circumferential groove wall, so that the sealing groove 11122 can be communicated with the second sinking groove 11124. The connecting channel 11126 can be understood as a through groove structure or a through hole structure formed on the circumferential groove wall. Alternatively, the connecting channel 11126 can also be understood as an overflow port with an overflow function.

[0118] The main function of the connecting channel 11126 is that when the cover body 1113 is covered above the sealing groove 11122 and presses the bonding member 1115, the excess bonding member 1115 can enter the connecting channel 11126 or flow from the connecting channel 11126 into the second sinking groove 11124, so as to reduce the top thrust of the bonding member 1115 on the cover body 1113, so that the cover body 1113 can be in contact with the bottom surface of the first sinking groove 11123, forming a larger contact area, thereby improving the stability of the cover body 1113. Of course, when the volume of the bonding member 1115 is large, there may also be a part of the bonding member 1115 between the surface of the cover body 1113 and the bottom surface of the first sinking groove 11123.

[0119] One or more connecting channels 11126 are provided. When multiple connecting channels 11126 are provided, the multiple connecting channels 11126 can be arranged around the central axis of the first sinking groove 11123 in a circumferential and spaced manner.

[0120] In this embodiment, by providing the connecting channel 11126, the excess bonding member 1115 in the sealing groove 11122 can be discharged into the connecting channel 11126, so as to reduce the resistance of the bonding member 1115 to the cover body 1113 during the connection of the cover body 1113, and improve the convenience and reliability of installation.

[0121] In some embodiments, as shown in Figure 11 the groove depth H2 of the second sinking groove ranges from 1.5 mm to 3.0 mm.

[0122] Specifically, in terms of the cooperation with the first sinking groove 11123, the deeper groove depth range of the second sinking groove 11124 can form a reasonable structural hierarchy with the first sinking groove 11123 (the groove depth range is 0.8 mm - 1.5 mm). For example, the first sinking groove 11123 can be mainly used to achieve the preliminary sealing and positioning of the cover body 1113, while the deeper space of the second sinking groove 11124 can be used to further accommodate the plugging component 1116, sealing material, buffer structure, etc. for secondary sealing. The two work together, which is beneficial to improving the sealing performance and protection performance of the overall structure.

[0123] Analyzed from the aspect of structural strength, a groove depth of 1.5 mm - 3.0 mm can ensure the realization of functional requirements without excessively weakening the strength of the electrode terminal 1112. Compared with a too-deep sinking groove, this groove depth range is within a reasonable limit and will not make the remaining thickness of the electrode terminal 1112 in the surrounding area of the second sinking groove 11124 too small, enabling the electrode terminal 1112 to still maintain a good ability to resist external forces and ensuring the stability of the entire structure when subjected to external forces such as mechanical shocks and vibrations.

[0124] In this embodiment, a groove depth of 1.5 mm - 3.0 mm can form a larger accommodating space 1123 on the electrode terminal 1112 to facilitate adding additional sealing components and provide sufficient supporting force for the cover body 1113, which is beneficial to reducing the weight of the electrode terminal 1112 and ensuring sufficient strength and stiffness.

[0125] In some embodiments, as shown in Figure 11 、 Figure 12 、 Figure 14 、 Figure 18 and Figure 19 the cover body 1113 includes a cover main body 11131 and a convex portion 11132 connected to the cover main body 11131. The convex portion 11132 is arranged in a ring shape to match the sealing groove 11122, and the convex portion 11132 can be at least partially inserted into the sealing groove 11122 to contact the bonding member 1115.

[0126] Specifically, the cover body 1113 includes a cover main body 11131 and a protrusion 11132. Among them, the cover main body 11131 can be in a sheet or plate shape. The cover main body 11131 has two opposite surfaces, one of which faces the bottom surface of the first sinking groove 11123, and the other surface is flush with the assembly surface 11125. The protrusion 11132 is located on the surface of the cover main body 11131 facing the first sinking groove 11123, and the protrusion 11132 extends and protrudes from this surface in the direction towards the sealing groove 11122. The extension height (abbreviated as height) of the protrusion 11132 can be greater than, less than, or equal to the depth of the sealing groove 11122. For example, if the extension height of the protrusion 11132 is less than or equal to the depth of the sealing groove 11122, the protrusion 11132 can be completely accommodated in the sealing groove 11122, and the bonding member 1115 can be at least located between the protruding end face of the protrusion 11132 and the bottom surface of the sealing groove, so that the surface of the cover body 1113 facing the sealing groove 11122 can contact the bottom surface of the first sinking groove 11123. Another example is that if the extension height of the protrusion 11132 is greater than the depth of the sealing groove 11122, the protrusion 11132 can be partially inserted into the sealing groove 11122, and the protruding end face of the protrusion 11132 and the bottom surface of the sealing groove 11121 can be in contact or spaced apart, and the spaced space is used to arrange the bonding member 1115. At this time, it can be known that the surface of the cover body 1113 on the side facing the sealing groove 11122 is spaced apart from the bottom surface of the first sinking groove 11123.

[0127] The extension shape or arrangement shape of the protrusion 11132 is annular and matches the sealing groove 11122, so that when the cover body 1113 is assembled with the first sinking groove 11123, the protrusion 11132 can be at least partially inserted into the sealing groove 11122, enabling the protrusion 11132 to be connected to the bonding member 1115 in the sealing groove 11122. The sealing groove 11122 has a certain width in the direction perpendicular to the extension length direction (i.e., the cross-sectional direction), and the width of the protrusion 11132 in this width direction is less than or equal to the width of the sealing groove 11122. When the width of the protrusion 11132 is less than the width of the sealing groove 11122, it can be known that a sealing structure (such as bonding glue) is provided between the two sides of the protrusion 11132 and the groove wall of the sealing groove 11122. Then, the protruding cross-section of the protrusion 11132 and the two opposite side surfaces of the protrusion 11132 can both contact the sealing structure, which is beneficial to increasing the contact area between the bonding member 1115 and the protrusion 11132, and further enhancing the connection strength.

[0128] In this embodiment, through the protrusion 11132, and making the protrusion 11132 be inserted and matched with the sealing groove 11122, on the one hand, a limit for the cover body 1113 is formed, and on the other hand, it is more convenient for the bonding member 1115 to perform bonding cooperation between the protrusion 11132 and the cover body 1113, which is beneficial to increasing the bonding area and further improving the connection reliability.

[0129] In some embodiments, referring to Figure 18 as shown, the protrusion 11132 is arranged in a continuous shape around the liquid injection hole 1114.

[0130] Specifically, the protrusion 11132 being in a continuous shape means that the protrusion 11132 is continuous and unbroken in the extending length direction. For example, the extending trajectory of the protrusion 11132 is circular, so that the protrusion 11132 continuously extends and surrounds the outer periphery of the liquid injection hole 1114.

[0131] The extending trajectory of the protrusion 11132 is consistent with and matches the extending trajectory of the sealing groove 11122, so that the notch of the sealing groove 11122 is all inserted with the protrusion 11132. Furthermore, it can be known that the protrusion 11132 can be in contact with all the bonding members 1115 in the sealing groove 11122, which is beneficial to increasing the contact area between the protrusion 11132 and the bonding member 1115, and further improving the connection strength.

[0132] In this embodiment, making the protrusion 11132 continuously extend in a ring shape can contact more bonding members 1115, thereby increasing the connection area to improve the connection strength.

[0133] In some embodiments, referring to Figure 19 as shown, the protrusion 11132 is arranged in an intermittent shape around the liquid injection hole 1114.

[0134] Specifically, the protrusion 11132 being in an intermittent shape means that the protrusion 11132 includes a plurality of independent convex blocks, and the convex blocks are arranged at intervals and surround the liquid injection hole 1114 at intervals, so that the protrusion 11132 is in an overall intermittent shape; the extending shape of each convex block is consistent with the shape of the matching sealing groove 11122, and each convex block is inserted into the sealing groove 11122.

[0135] In this embodiment, the intermittent protrusion 11132 is beneficial to saving material costs and can also serve the purpose of contacting the bonding member 1115 to form a limit for the cover body 1113.

[0136] In some embodiments, referring to Figure 10 and Figure 15As shown, the groove depth H3 of the sealing groove ranges from 0.4 mm to 1.0 mm, and the protruding height H4 of the protruding part is 0.2 - 0.5 mm.

[0137] Specifically, a sealing structure needs to be arranged in the sealing groove 11122. Therefore, the depth of the sealing groove 11122 should not be too shallow. For example, the minimum groove depth H3 of the sealing groove can be 0.4 mm. In this case, the height of the sealing structure can be 0.1 mm - 0.3 mm, and the protruding height H4 of the protruding part can be between 0.2 - 0.5 mm. The depth of the protruding part 11132 inserted into the sealing groove 11122 is 0.1 mm. It should be noted that in this case, the protruding part 11132 does not completely enter the sealing groove 11122, and a gap space will be formed between the surface of the cover body 11131 connecting the protruding part 11132 and the notch surface of the sealing groove 11122 (for example, the bottom surface of the first sinking groove 11123). When the protruding part 11132 is inserted into the sealing groove 11122 to squeeze the bonding part 1115, the bonding part 1115 can flow into this gap space. Another example is that the groove depth of the sealing groove 11122 is 1.0 mm, the protruding height H4 of the protruding part is 0.5 mm, and the height of the bonding part 1115 is 0.5 mm. In this case, the protruding part 11132 can completely enter the sealing groove 11122, and the surface of the cover body 11131 connecting the protruding part 11132 abuts and cooperates with the notch surface of the sealing groove 11122 (for example, the bottom surface of the first sinking groove 11123), which is beneficial to reducing the risk of the bonding part 1115 overflowing.

[0138] In this embodiment, the groove depth H3 of the sealing groove needs to be set in cooperation with the protruding height H4 of the protruding part to facilitate the placement or filling of the bonding part 1115, thereby enhancing the connection strength between the cover body 1113 and the electrode terminal 1112.

[0139] In some embodiments, referring to Figure 14 、 Figure 15 、 Figure 18 and Figure 19 As shown, the outer diameter of the cover body 11131 is larger than the outer diameter of the protruding part 11132, so that the cover body 11131 forms an outer edge part 11133 at a position close to the edge compared with the protruding part 11132, and the outer edge part 11133 abuts on the electrode terminal 1112.

[0140] Specifically, the difference between the outer diameters of the cover body 11131 and the protruding part 11132 causes the cover body 11131 to extend outward by a part in the area close to its edge compared with the protruding part 11132, and this extended area is defined as the outer edge part 11133. The extending direction (or the outward convex direction) of the outer edge part 11133 can be perpendicular to the protruding direction of the protruding part 11132.

[0141] The outer edge portion 11133 plays a crucial role in positioning and sealing between the cover body 11131 and the electrode terminal 1112. When the cover body 11131 is installed into the first sunk groove 11123, the outer edge portion 11133 abuts against the bottom surface of the first sunk groove 11123 and abuts against the groove wall surface of the first sunk groove 11123. The outer edge portion 11133 precisely abuts against the bottom surface of the first sunk groove 11123, and the bottom surface of the first sunk groove 11123 forms a stable support for the cover body 11131 in the vertical direction. At the same time, the outer edge portion 11133 also abuts against the groove wall surface of the first sunk groove 11123, which can enhance the sealing effect to a certain extent and limit the displacement of the cover body 11131 in the direction perpendicular to the groove depth of the sealing groove 11122.

[0142] The outer edge portion 11133 can be understood as a part of the structure of the cover body 11131. Alternatively, the outer edge portion 11133 can also be a part that is detachably or welded to the cover body 11131. In the direction perpendicular to the sealing groove 11122, it can be seen that the outer edge portion 11133 protrudes outside the protruding portion 11132. The position where the outer edge portion 11133 contacts the bottom surface of the first sunk groove 11123 forms a sealing structure, which can increase the path for the bonding member 1115 to reach the exposed surface of the cover body 11131, is conducive to restricting the overflow of the bonding member 1115 to the exposed surface of the cover body 11131, that is, is conducive to restricting the overflow of the bonding member 1115 to the welded position between the cover body 1113 and the electrode terminal 1112, reducing the influence of the bonding member 1115 on the welding, and is conducive to improving the welding quality.

[0143] In this embodiment, by forming the outer edge portion 11133, it is beneficial to enhance the sealing between the cover body 1113 and the electrode terminal 1112, reduce the risk of the bonding member 1115 overflowing to the welded position between the cover body 1113 and the electrode terminal 1112, is beneficial to improving the welding quality between the cover body 1113 and the electrode terminal 1112, and improves the connection reliability.

[0144] In some embodiments, referring to Figure 10 and Figure 15 as shown, in the direction perpendicular to the groove depth of the sealing groove 11122, the outer convex width of the outer edge portion 11133 compared to the protruding portion 11132 is 0.3 mm - 1.0 mm.

[0145] Specifically, the size of the outward convex width L (or the outward extension width) of the outer edge portion 11133 affects the restricting effect on the flowing bonding member 1115. The direction perpendicular to the groove depth direction of the sealing groove 11122 can be defined as the second direction Y. Since the sealing groove 11122 extends in a ring shape, the second direction Y can also be understood as the radial direction. In the second direction Y, the larger the outward convex width L of the outer edge portion 11133, the longer the path that the flowing bonding member 1115 needs to pass through when overflowing outward, making it difficult for the flowing bonding member 1115 to flow to the position where the cover main body 11131 contacts the groove wall of the first sink 11123. Since the position where the cover main body 11131 contacts the groove wall of the first sink 11123 is the welding position, it can be seen that increasing the outward convex width L of the outer edge portion 11133 can reduce the risk of the flowing bonding member 1115 flowing to the welding position.

[0146] However, the outward convex width L of the outer edge portion 11133 should not be too long. The larger the width, the smaller the diameter of the sealing groove 11122, which is less conducive to processing and the production cost increases relatively. In addition, the smaller the diameter of the sealing groove 11122, the closer the sealing groove 11122 and the bonding member 1115 therein are to the liquid injection hole 1114, increasing the risk of the bonding member 1115 overflowing to the liquid injection hole 1114.

[0147] In this embodiment, the outward convex width L of the outer edge portion 11133 is 0.3 mm - 1.0 mm, which can take into account the distances between the bonding member 1115 and the liquid injection hole 1114 and the groove wall of the first sink 11123, thereby facilitating reducing the influence of the bonding member 1115 on welding and the electrolyte and improving the reliability of the use of the battery cell 1110.

[0148] In some embodiments, referring to Figure 11 and Figure 13 as shown, the sealing groove 11122 includes at least two concentrically arranged sealing sub - grooves 11127, and a bonding member 1115 is arranged in at least one of the sealing sub - grooves 11127.

[0149] Specifically, the sealing groove 11122 can be provided with one sealing sub - groove 11127, and this sealing sub - groove 11127 is the sealing groove 11122. The sealing groove 11122 can also include at least two (i.e., multiple) sealing sub - grooves 11127. The multiple sealing sub - grooves 11127 are concentrically arranged with the liquid injection hole 1114 as the center, and there is a spacing distance between adjacent two sealing sub - grooves 11127. This spacing distance can be between 0.1 - 1.5 times the groove width of the sealing groove 11122, and can be adaptively designed according to the outer diameter size of the cover body 1113 and the outer diameter size of the sealing groove 11122.

[0150] Among multiple sealing sub-grooves 11127, a bonding member 1115 needs to be arranged in at least one sealing sub-groove 11127. For example, the sealing groove 11122 includes two concentric sealing sub-grooves 11127, one is the inner sealing sub-groove 11127 close to the liquid injection hole 1114, and the other is the outer sealing sub-groove 11127 relatively far from the liquid injection hole 1114. The bonding member 1115 can be separately arranged in the inner sealing sub-groove 11127 or the outer sealing sub-groove 11127 of the housing 1111 respectively; alternatively, the bonding member 1115 can be arranged in both the inner sealing sub-groove 11127 and the outer sealing sub-groove 11127. Correspondingly, two protrusions 11132 can be arranged to match the inner sealing sub-groove 11127 and the outer sealing sub-groove 11127, and each protrusion 11132 is respectively inserted into the inner sealing sub-groove 11127 and the outer sealing sub-groove 11127, which is beneficial to increasing the contact area between the protrusion 11132 and the bonding member 1115, and further improving the connection strength between the cover body 1113 and the electrode terminal 1112.

[0151] The notch widths of multiple sealing sub-grooves 11127 can be configured to be equal for easy processing and manufacturing; optionally, the notch widths (abbreviated as widths) of multiple sealing sub-grooves 11127 can also be different, which is beneficial to adaptively allocate the dosage of the bonding member 1115. For example, since the inner sealing sub-groove 11127 is closer to the liquid injection port and requires higher sealing performance, the notch width of the inner sealing sub-groove 11127 can be made larger than that of the outer sealing sub-groove 11127. Of course, the notch width of the inner sealing sub-groove 11127 can also be smaller than that of the outer sealing sub-groove 11127.

[0152] In this embodiment, by arranging multiple concentric sealing sub-grooves 11127, the sealing performance between the cover body 1113 and the electrode terminal 1112 can be improved.

[0153] In some embodiments, referring to Figure 13 As shown, one or more through channels 11128 are arranged between two adjacent sealing sub-grooves 11127 to connect the two adjacent sealing sub-grooves 11127.

[0154] Specifically, in the case where the sealing groove 11122 includes multiple sealing sub-grooves 11127, in order to enable the bonding member 1115 between two adjacent sealing sub-grooves 11127 to flow, through channels 11128 connecting the two sealing sub-grooves 11127 are arranged, so that the flowing bonding member 1115 can flow through the through channels 11128 to balance the volume of the bonding member 1115 in the two adjacent sealing sub-grooves 11127.

[0155] One or more through-channels 11128 may be provided. When multiple through-channels 11128 are provided, the multiple through-channels 11128 are opened on the solid area between two adjacent sealed sub-grooves 11127, matching the surrounding shape of the sealed sub-grooves 11127. The multiple through-channels 11128 are circumferentially arranged around the liquid injection hole 1114 at intervals, and the multiple through-channels 11128 may be evenly distributed.

[0156] For example, two sealed sub-grooves 11127 are provided, namely an inner sealed sub-groove 11127 and an outer sealed sub-groove 11127. The inner sealed sub-groove 11127 and the outer sealed sub-groove 11127 are connected and communicated through a plurality of through-channels 11128. The through-channels 11128 are through-holes or through-grooves, so that the bonding member 1115 can flow between the inner sealed sub-groove 11127 and the outer sealed sub-groove 11127 through the through-channels 11128 to balance the volume of the bonding member 1115 in the two sealed sub-grooves 11127, which is beneficial to reducing the imbalance problem of the extrusion force between the bonding member 1115 and the convex portion 11132 and improving the uniformity of stress distribution.

[0157] In this embodiment, by providing the through-channels 11128 between adjacent sealed sub-grooves 11127, it is beneficial to balance the volume of the bonding member 1115 in the two sealed sub-grooves 11127 to balance the stress between the cover 1113 and the electrode terminal 1112.

[0158] In some embodiments, referring to Figure 16 As shown, the bottom surface 11121 of the sealed groove is in the shape of an arc surface.

[0159] Specifically, the bottom surface 11121 of the sealed groove being in the shape of an arc surface means that in the cross-section of the sealed groove 11122, the trajectory shape of the bottom surface 11121 of the sealed groove is an arc line. The cross-section of the sealed groove 11122 refers to the cross-section of the sealed groove 11122 in a direction parallel to the groove depth direction and perpendicular to the extension length direction of the sealed groove 11122.

[0160] The bottom surface 11121 of the sealed groove may be a plane or an arc surface. From the perspective of force, using an arc-shaped bottom surface can disperse pressure more evenly than a flat bottom surface, and can make the flowing bonding member 1115 flow and converge to the lower middle position of the bottom surface, so that the distribution of the bonding member 1115 on the bottom surface has a directionality. As the bonding member 1115 flows, it gradually converges to the middle of the bottom surface. This converging effect can effectively improve the bonding strength and stability. After the flowing bonding member 1115 converges to the middle of the bottom surface, it can more effectively fill the possible tiny gaps, further enhancing the sealing performance.

[0161] In the present embodiment, the arc-shaped groove bottom surface is more conducive to the directional convergence of the flowing bonding member 1115, so as to reduce the generation of voids, make the filling effect of the bonding member 1115 denser, and improve the connection strength.

[0162] In some embodiments, as shown in Figure 14 FIG. 5, the battery cell 1110 further includes a plugging member 1116, and the plugging member 1116 is connected to the electrode terminal 1112 and seals the liquid injection hole 1114.

[0163] Specifically, the plugging member 1116 can adopt a block structure. For example, the plugging structure can adopt a columnar or T-shaped plug structure, etc. At least a part of the plugging member 1116 can be inserted into the liquid injection hole 1114, and an interference fit can be provided between the plugging member 1116 and the liquid injection hole 1114 to plug the liquid injection hole 1114.

[0164] The plugging member 1116 can at least have an elastic part capable of elastic expansion and contraction. The elastic part can be inserted into the liquid injection hole 1114, and an extrusion force is generated between the elastic part and the hole wall of the liquid injection hole 1114 to improve the sealing performance between the plugging member 1116 and the liquid injection hole 1114.

[0165] In the case of having the second sinking groove 11124, the part of the plugging member 1116 protruding outside the liquid injection hole 1114 can be accommodated in the second sinking groove 11124, so as to make full use of the space and improve the space utilization rate.

[0166] In the present embodiment, by adding the plugging member 1116, a double-layer seal for the liquid injection hole 1114 is formed, so as to improve the sealing effect and reduce the risk of electrolyte leakage.

[0167] In some embodiments, as shown in Figure 17 FIG. 6, the electrode terminal 1112 includes a terminal body part 1118 and a boss part 1119 connected to the terminal body part 1118. The boss part 1119 protrudes from the terminal body part 1118. The liquid injection hole 1114 and the sealing groove 11122 are both opened on the protruding end surface of the boss part 1119.

[0168] Specifically, the terminal body part 1118 can adopt a sheet structure and can be prepared by a plate body. The terminal body part 1118 has two opposite surfaces. The terminal body part 1118 is connected to the outer shell 1111 of the battery cell 1110. One surface of the terminal body part 1118 faces the accommodation cavity 11111 of the outer shell 1111, and the other surface of the terminal body part 1118 faces the external space of the battery cell 1110. The boss part 1119 is connected to the other surface, and the boss part 1119 protrudes a preset height from the surface in the direction away from the surface. The end surface of the protruding end of the boss part 1119 is defined as the protruding end surface.

[0169] The liquid injection hole 1114 and the sealing groove 11122 are both provided on the protruding end face. It can be understood that in the case where the first sinking groove 11123 and the second sinking groove 11124 are provided, it is equivalent to that the liquid injection hole 1114 penetrates the entire thickness direction of the electrode terminal 1112 from the protruding end face, that is, it is equivalent to that the orifice of the liquid injection hole 1114 is provided on the bottom surface of the second sinking groove 11124; the sealing groove 11122 is equivalent to being provided on the bottom surface of the first sinking groove 11123.

[0170] The boss portion 1119 and the terminal body portion 1118 can be connected by welding or detachable connection, or the boss portion 1119 and the terminal body portion 1118 are formed into an integral structure by integral molding, and the electrode terminal 1112 can be formed by injection molding or stamping.

[0171] In this embodiment, the electrode terminal 1112 is connected to the terminal body portion 1118 in a manner that the boss portion 1119 protrudes, which can make the terminal body portion 1118 have a smaller thickness, so as to facilitate reducing the material consumption and lowering the production cost.

[0172] In some embodiments, referring to Figure 4 and Figure 5 as shown, the battery cell 1110 further includes a housing 1111 and an electrode assembly 1117. The housing 1111 has a receiving cavity 11111, and the electrode assembly 1117 is received in the receiving cavity 11111; the electrode terminal 1112 is connected to the housing 1111 and is electrically connected to the electrode assembly 1117.

[0173] Among them, the electrode assembly 1117 can be understood as a kind of bare battery cell. The electrode assembly 1117 is formed with tabs, and the tabs can be directly electrically connected to the electrode terminal 1112, or the tabs can be electrically connected to the electrode terminal 1112 through a connecting piece. In the battery cell 1110, the electrode assembly 1117 is used to cause the ions in the electrolyte to move directionally and carry out chemical reactions on the electrode surface. The anode attracts anions to undergo an oxidation reaction, and the cathode attracts cations to undergo a reduction reaction, resulting in the flow of electrons and thus forming an electric current.

[0174] For the housing 1111, referring to Figure 4 and Figure 5As shown, the housing 1111 may include two parts, namely a first part 11112 and a second part 11113. The first part 11112 and the second part 11113 cover each other, and the first part 11112 and the second part 11113 jointly define a receiving cavity 11111 for receiving the electrode assembly 1117. The second part 11113 may be a hollow structure with an open end, and the first part 11112 may be a plate-like structure. The first part 11112 covers the open side of the second part 11113 so that the first part 11112 and the second part 11113 jointly define the receiving cavity 11111; the first part 11112 and the second part 11113 may also both be hollow structures with an open side, and the open side of the first part 11112 covers the open side of the second part 11113. The electrode terminal 1112 may be connected to the first part 11112 or the second part 11113. The electrode terminal 1112 and the first part 11112 (or the second part 11113) may be connected by welding, or the electrode terminal 1112 and the first part 11112 (or the second part 11113) are integrally formed by an integral molding method. Of course, the housing 1111 formed by the first part 11112 and the second part 11113 may be in various shapes, such as a cylinder, a cuboid, etc.

[0175] In this embodiment, the housing 1111 plays a role in carrying the electrode terminal 1112 to improve the installation stability of the electrode terminal 1112.

[0176] In a specific embodiment, refer to Figures 4-19As shown, the battery cell 1110 includes an electrode terminal 1112, a cover 1113, and an adhesive member 1115. The electrode terminal 1112 has a liquid injection hole 1114 and a sealing groove 11122, and the sealing groove 11122 is disposed around the liquid injection hole 1114; the cover 1113 is welded to the electrode terminal 1112, and the cover 1113 can cover the liquid injection hole 1114 and the sealing groove 11122; the adhesive member 1115 is located in the sealing groove 11122 and is connected to the cover 1113 to limit the cover 1113 on the electrode terminal 1112; a first sink 11123 is formed on the electrode terminal 1112, and both the sealing groove 11122 and the liquid injection hole 1114 are disposed on the bottom surface of the first sink 11123, and at least a part of the cover 1113 is received in the first sink 11123; a second sink 11124 is formed on the bottom surface of the first sink 11123, the liquid injection hole 1114 is formed on the bottom surface of the second sink 11124, and the sealing groove 11122 is disposed on the outer periphery of the opening of the second sink 11124; one or more connection channels 11126 are formed on the groove wall of the sealing groove 11122, and the connection channels 11126 communicate the sealing groove 11122 and the second sink 11124; the cover 1113 includes a cover main body 11131 and a protrusion 11132 connected to the cover main body 11131, the protrusion 11132 is arranged in a ring shape matching the sealing groove 11122, and the protrusion 11132 can be at least partially inserted into the sealing groove 11122 to contact the adhesive member 1115; the outer diameter of the cover main body 11131 is greater than the outer diameter of the protrusion 11132, so that the cover main body 11131 forms an outer edge portion 11133 at a position near the edge compared with the protrusion 11132, and the outer edge portion 11133 abuts against the bottom surface of the first sink 11123 and abuts against the groove wall surface of the first sink 11123; the battery cell 1110 further includes a plugging member 1116, and the plugging member 1116 is connected to the electrode terminal 1112 and seals the liquid injection hole 1114.

[0177] According to some embodiments of the present application, with reference to Figure 2 and Figure 3 As shown, the present application further provides a battery device 1100, and the battery device 1100 includes the battery cell 1110 in the above embodiments.

[0178] Specifically, with reference to Figure 2 and Figure 3As shown, an embodiment of the present application provides a battery apparatus 1100, which may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells 1110, and the plurality of battery cells 1110 are connected in series, parallel or in a hybrid connection through a busbar component. The battery apparatus 1100 may also be a battery pack, which generally includes a housing 1120 and one or more battery cells 1110, and the battery cells 1110 are accommodated in the housing 1120.

[0179] The battery apparatus 1100 disclosed in the embodiments of the present application can be used in electrical devices that use the battery apparatus 1100 as a power source or various energy storage devices and energy storage systems that use the battery apparatus 1100 as an energy storage element. The electrical device may be, but is not limited to, a mobile phone, a portable device, a laptop computer, an electric toy, an electric tool, a battery car, a vehicle 1000, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0180] For the convenience of description in the following embodiments, a vehicle 1000, which is an electrical device in an embodiment of the present application, is taken as an example for description.

[0181] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The battery apparatus 1100 is disposed inside the vehicle 1000, and the battery apparatus 1100 may be disposed at the bottom, the head or the tail of the vehicle 1000. The battery apparatus 1100 can be used for power supply of the vehicle 1000. For example, the battery apparatus 1100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 may further include a controller 1200 and a motor 1300, and the controller 1200 is used to control the battery apparatus 1100 to supply power to the motor 1300, for example, for the working power requirements during the start, navigation and driving of the vehicle 1000.

[0182] In some embodiments of the present application, the battery apparatus 1100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0183] Please refer to Figure 2 and Figure 3As shown Figure 2 and Figure 3 are both explosion diagrams of the battery device 1100 provided in some embodiments of the present application. Figure 2 In [diagram 1], the battery cell 1110 is cube-shaped. Figure 3 In [diagram 2], the battery cell 1110 is cylindrical. In one embodiment, the battery device 1100 includes a box body 1120 and a battery cell assembly. An accommodation space 1123 is formed inside the box body 1120, and the battery cell 1110 is accommodated in the accommodation space 1123. The battery cell assembly is usually formed by arranging a plurality of battery cells 1110. Alternatively, the battery cell assembly can also be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells 1110 to form an independent module. Among them, the box body 1120 is used to provide the accommodation space 1123 for the battery cell 1110, and the box body 1120 can adopt various structures.

[0184] For the box body 1120, the box body 1120 is used to accommodate the battery cell assembly. The box body 1120 may include a first structural part 1121 and a second structural part 1122. The first structural part 1121 and the second structural part 1122 cover each other, and the first structural part 1121 and the second structural part 1122 jointly define the accommodation space 1123 for accommodating the battery cell 1110. Among them, the first structural part 1121 can be a plate-like structure, and the second structural part 1122 can be a hollow structure with one end open. The first structural part 1121 covers the opening side of the second structural part 1122 to jointly define the accommodation space 1123 with the second structural part 1122. Optionally, the first structural part 1121 can also adopt a hollow structure with one side open. Then, the second structural part 1122 can also be a hollow structure with one end open, and the opening side of the first structural part 1121 covers the opening side of the second structural part 1122 to jointly define the accommodation space 1123 with the second structural part 1122. The box body 1120 can be various shapes, such as a cylinder, a cuboid, etc.

[0185] According to some embodiments of the present application, the present application also provides an energy storage device. The energy storage device includes a plurality of battery cells 1110 and a battery device 1100, and the battery cells 1110 and the battery device 1100 are used to store or provide electrical energy.

[0186] Specifically, the energy storage device may include one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include a plurality of battery cells 1110 and a battery device 1100. The plurality of battery cells 1110 and the plurality of battery devices 1100 are connected in series through a busbar component to increase the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0187] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. Energy storage devices can store electrical energy as needed and output electrical energy at appropriate times. For example, energy storage devices can store electrical energy during low electricity consumption periods and provide electrical energy to relevant users or electrical equipment during high electricity consumption periods. The energy storage system provided by the embodiments of the present application can be any power system that requires the use of energy storage devices.

[0188] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0189] In some embodiments, the energy storage device may include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0190] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a total control module, a power distribution module, and a fire protection module.

[0191] As an example, the thermal management module may include a liquid cooling unit, and the liquid cooling unit provides coolant for adjusting the temperature of the battery cells 1110 to each battery device 1100 through pipelines.

[0192] As an example, the main control module can serve as the battery management unit of the battery cluster and is used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For example, it can control the charge and discharge current, voltage, etc. of the battery cluster. The main control module includes modules such as an auxiliary battery management unit SBMU (Slave Battery Management Unit, SBMU) and a fusion switch.

[0193] As an example, the total control module can serve as the battery management unit of the energy storage device and is used to monitor and manage the energy storage device. The total control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device. For example, it can control the charge and discharge current, voltage, etc. of the energy storage device. As an example, the total control module includes modules such as an insulation monitoring module IMM (Insulation Monitoring Module, abbreviated as IMM), a main battery management unit MBMU (Master Battery Management Unit, MBMU), an Ethernet ETH (EtherNet, ETH), and a fiber optic conversion module.

[0194] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., and is used to detect, alarm, or extinguish fires in the energy storage system.

[0195] As an example, the power distribution module can be used to distribute power to the modules that need electricity in the energy storage device.

[0196] According to some embodiments of the present application, the present application further provides an energy storage system, which includes a power conversion device and the energy storage device in the above embodiments, and the power conversion device is used to electrically connect the power generation device and the energy storage device.

[0197] In some embodiments, the energy storage system may include one or more energy storage devices and a power conversion device (Power Converter System, abbreviated as PCS), and the power conversion device is used to connect between the power generation device and the energy storage device. The power generation device is used to generate electric energy, and the electric energy generated by the power generation device can be stored in the energy storage device through the power conversion device. As an example, the power generation device may specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. Among them, the specific type of the power generation device is not limited in the present application.

[0198] According to some embodiments of the present application, with reference to Figure 1 as shown, the present application further provides an electrical device, which includes the battery device 1100 in the above embodiments, the energy storage device in the above embodiments, or the energy storage system in the above embodiments, and the battery device 1100 is used to store or provide electric energy.

[0199] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells 1110. For example, mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, vehicles 1000, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0200] The examples of the electrical devices in the present application are based on the examples of the above battery device 1100, and the examples of the electrical devices include all the technical effects of the examples of the above battery device 1100, which will not be elaborated here.

[0201] According to some embodiments of the present application, the present application further provides a charging network, which includes a charging pile and the energy storage device in the above embodiments or the energy storage system in the above embodiments, and the energy storage device is used to provide electric energy for the charging pile.

[0202] For example, the charging network includes a charging pile and an energy storage device. The charging pile is electrically connected to the energy storage device, and the energy storage device is used to provide electric energy for the charging pile. The charging pile and the battery device 1100 in the energy storage device are electrically connected through a cable, and the battery device 1100 can provide the electric energy stored in itself to the charging pile. The charging pile has one or more connectors, and the connectors are used to connect to an electrical device (such as a vehicle 1000), so as to replenish energy to the electrical device.

[0203] The energy storage device can be located inside the charging pile (such as an integrated charging and storage machine), or outside the charging pile.

[0204] The above are only preferred embodiments of the present application, and only specifically describe the technical principles of the present application. These descriptions are only for explaining the principles of the present application and cannot be interpreted as limiting the scope of protection of the present application in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application, and other specific implementation methods of the present application that can be associated with the technicians in this field without creative work, should be included in the scope of protection of the present application.

Claims

1. A battery cell (1110), characterized in that: include: An electrode terminal (1112) having a liquid injection hole (1114) and a sealing groove (11122), wherein the sealing groove (11122) is arranged around the liquid injection hole (1114); A cover body (1113) connected to the electrode terminal (1112), the cover body (1113) being capable of covering the liquid injection hole (1114) and the sealing groove (11122); An adhesive member (1115) is located in the sealing groove (11122) and is connected to the cover body (1113) so that the cover body (1113) is limitedly located on the electrode terminal (1112).

2. The battery cell (1110) according to claim 1, characterized in that: The electrode terminal (1112) is provided with a first sink groove (11123), the sealing groove (11122) and the injection hole (1114) are both arranged on the bottom surface of the first sink groove (11123), and the cover body (1113) is at least partially accommodated in the first sink groove (11123).

3. The battery cell (1110) according to claim 2, characterized in that: The electrode terminal (1112) has an assembly surface (11125), the first sink groove (11123) is opened on the assembly surface (11125), and the surface of the cover body (1113) is arranged flush with the assembly surface (11125).

4. The battery cell (1110) according to claim 2, characterized in that: The groove depth of the first sink groove (11123) ranges from 0.8 mm to 1.5 mm.

5. The battery cell (1110) according to claim 2, characterized in that: A second sink groove (11124) is provided on the bottom surface of the first sink groove (11123), the injection hole (1114) is provided on the bottom surface of the second sink groove (11124), and the sealing groove (11122) is arranged on the outer periphery of the groove opening of the second sink groove (11124).

6. The battery cell (1110) according to claim 5, characterized in that: One or more connecting channels (11126) are provided on the groove wall of the sealing groove (11122), and the connecting channels (11126) are connected to the sealing groove (11122) and the second sink groove (11124).

7. The battery cell (1110) according to claim 5, characterized in that: The second sink groove (11124) has a groove depth ranging from 1.5 mm to 3.0 mm.

8. The battery cell (1110) according to any one of claims 1 to 7, characterized in that: The cover body (1113) comprises a cover main body (11131) and a protrusion (11132) connected to the cover main body (11131), the protrusion (11132) being arranged in an annular shape to match the sealing groove (11122), and the protrusion (11132) can be at least partially inserted into the sealing groove (11122) to contact the adhesive member (1115).

9. The battery cell (1110) according to claim 8, characterized in that: The protrusion (11132) is arranged in a continuous manner around the injection hole (1114); or, The protrusion (11132) is disposed in a discontinuous manner around the liquid injection hole (1114).

10. The battery cell (1110) according to claim 8, characterized in that: The groove depth of the sealing groove (11122) ranges from 0.4 mm to 1.0 mm, and the protrusion height of the protrusion (11132) ranges from 0.2 mm to 0.5 mm.

11. The battery cell (1110) according to claim 8, characterized in that: The outer diameter of the cover body (11131) is greater than the outer diameter of the protrusion (11132), so that the cover body (11131) forms an outer edge portion (11133) at a position close to the edge compared to the protrusion (11132), and the outer edge portion (11133) abuts against the electrode terminal (1112).

12. The battery cell (1110) according to claim 11, characterized in that: Along a groove depth direction perpendicular to the sealing groove (11122), the outer edge portion (11133) has a convex width of 0.3 mm to 1.0 mm compared to the protruding portion (11132).

13. The battery cell (1110) according to any one of claims 1 to 7, characterized in that: The sealing groove (11122) comprises at least two concentrically arranged sealing sub-grooves (11127), and the adhesive member (1115) is arranged in at least one of the sealing sub-grooves (11127).

14. The battery cell (1110) according to claim 13, characterized in that: One or more through channels (11128) are arranged between two adjacent sealing sub-grooves (11127) so as to allow the two adjacent sealing sub-grooves (11127) to communicate with each other.

15. The battery cell (1110) according to any one of claims 1 to 7, characterized in that: The bottom surface of the sealing groove (11122) is in the shape of an arc surface.

16. The battery cell (1110) according to any one of claims 1 to 7, characterized in that: The battery cell (1110) further comprises a sealing component (1116), wherein the sealing component (1116) is connected to the electrode terminal (1112) and seals the liquid injection hole (1114).

17. The battery cell (1110) according to any one of claims 1 to 7, characterized in that: The electrode terminal (1112) includes a terminal body (1118) and a boss portion (1119) connected to the terminal body (1118), wherein the boss portion (1119) is arranged to protrude from the terminal body (1118), and the injection hole (1114) and the sealing groove (11122) are both provided on the protruding end surface of the boss portion (1119).

18. The battery cell (1110) according to any one of claims 1 to 7, characterized in that: The battery cell (1110) further comprises a housing (1111) and an electrode assembly (1117); the housing (1111) has a receiving cavity (11111), and the electrode assembly (1117) is received in the receiving cavity (11111); the electrode terminal (1112) is connected to the housing (1111) and is electrically connected to the electrode assembly (1117).

19. A battery device (1100), characterized in that: The battery device (1100) comprises the battery cell (1110) according to any one of claims 1 to 18.

20. An electrical device, characterized in that: The battery device (1100) comprises the battery cell (1110) according to any one of claims 1 to 18 or the battery device (1100) according to claim 19, wherein the battery device (1100) is used for storing or providing electrical energy.

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